Branch data Line data Source code
1 : : // SPDX-License-Identifier: GPL-2.0
2 : : /*
3 : : * USB hub driver.
4 : : *
5 : : * (C) Copyright 1999 Linus Torvalds
6 : : * (C) Copyright 1999 Johannes Erdfelt
7 : : * (C) Copyright 1999 Gregory P. Smith
8 : : * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
9 : : *
10 : : * Released under the GPLv2 only.
11 : : */
12 : :
13 : : #include <linux/kernel.h>
14 : : #include <linux/errno.h>
15 : : #include <linux/module.h>
16 : : #include <linux/moduleparam.h>
17 : : #include <linux/completion.h>
18 : : #include <linux/sched/mm.h>
19 : : #include <linux/list.h>
20 : : #include <linux/slab.h>
21 : : #include <linux/ioctl.h>
22 : : #include <linux/usb.h>
23 : : #include <linux/usbdevice_fs.h>
24 : : #include <linux/usb/hcd.h>
25 : : #include <linux/usb/otg.h>
26 : : #include <linux/usb/quirks.h>
27 : : #include <linux/workqueue.h>
28 : : #include <linux/mutex.h>
29 : : #include <linux/random.h>
30 : : #include <linux/pm_qos.h>
31 : : #include <linux/kobject.h>
32 : :
33 : : #include <linux/uaccess.h>
34 : : #include <asm/byteorder.h>
35 : :
36 : : #include "hub.h"
37 : : #include "otg_whitelist.h"
38 : :
39 : : #define USB_VENDOR_GENESYS_LOGIC 0x05e3
40 : : #define USB_VENDOR_SMSC 0x0424
41 : : #define USB_PRODUCT_USB5534B 0x5534
42 : : #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01
43 : : #define HUB_QUIRK_DISABLE_AUTOSUSPEND 0x02
44 : :
45 : : #define USB_TP_TRANSMISSION_DELAY 40 /* ns */
46 : : #define USB_TP_TRANSMISSION_DELAY_MAX 65535 /* ns */
47 : :
48 : : /* Protect struct usb_device->state and ->children members
49 : : * Note: Both are also protected by ->dev.sem, except that ->state can
50 : : * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
51 : : static DEFINE_SPINLOCK(device_state_lock);
52 : :
53 : : /* workqueue to process hub events */
54 : : static struct workqueue_struct *hub_wq;
55 : : static void hub_event(struct work_struct *work);
56 : :
57 : : /* synchronize hub-port add/remove and peering operations */
58 : : DEFINE_MUTEX(usb_port_peer_mutex);
59 : :
60 : : /* cycle leds on hubs that aren't blinking for attention */
61 : : static bool blinkenlights;
62 : : module_param(blinkenlights, bool, S_IRUGO);
63 : : MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs");
64 : :
65 : : /*
66 : : * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
67 : : * 10 seconds to send reply for the initial 64-byte descriptor request.
68 : : */
69 : : /* define initial 64-byte descriptor request timeout in milliseconds */
70 : : static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
71 : : module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
72 : : MODULE_PARM_DESC(initial_descriptor_timeout,
73 : : "initial 64-byte descriptor request timeout in milliseconds "
74 : : "(default 5000 - 5.0 seconds)");
75 : :
76 : : /*
77 : : * As of 2.6.10 we introduce a new USB device initialization scheme which
78 : : * closely resembles the way Windows works. Hopefully it will be compatible
79 : : * with a wider range of devices than the old scheme. However some previously
80 : : * working devices may start giving rise to "device not accepting address"
81 : : * errors; if that happens the user can try the old scheme by adjusting the
82 : : * following module parameters.
83 : : *
84 : : * For maximum flexibility there are two boolean parameters to control the
85 : : * hub driver's behavior. On the first initialization attempt, if the
86 : : * "old_scheme_first" parameter is set then the old scheme will be used,
87 : : * otherwise the new scheme is used. If that fails and "use_both_schemes"
88 : : * is set, then the driver will make another attempt, using the other scheme.
89 : : */
90 : : static bool old_scheme_first;
91 : : module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
92 : : MODULE_PARM_DESC(old_scheme_first,
93 : : "start with the old device initialization scheme");
94 : :
95 : : static bool use_both_schemes = 1;
96 : : module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
97 : : MODULE_PARM_DESC(use_both_schemes,
98 : : "try the other device initialization scheme if the "
99 : : "first one fails");
100 : :
101 : : /* Mutual exclusion for EHCI CF initialization. This interferes with
102 : : * port reset on some companion controllers.
103 : : */
104 : : DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
105 : : EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
106 : :
107 : : #define HUB_DEBOUNCE_TIMEOUT 2000
108 : : #define HUB_DEBOUNCE_STEP 25
109 : : #define HUB_DEBOUNCE_STABLE 100
110 : :
111 : : static void hub_release(struct kref *kref);
112 : : static int usb_reset_and_verify_device(struct usb_device *udev);
113 : : static int hub_port_disable(struct usb_hub *hub, int port1, int set_state);
114 : : static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1,
115 : : u16 portstatus);
116 : :
117 : : static inline char *portspeed(struct usb_hub *hub, int portstatus)
118 : : {
119 : : if (hub_is_superspeedplus(hub->hdev))
120 : : return "10.0 Gb/s";
121 : : if (hub_is_superspeed(hub->hdev))
122 : : return "5.0 Gb/s";
123 : : if (portstatus & USB_PORT_STAT_HIGH_SPEED)
124 : : return "480 Mb/s";
125 : : else if (portstatus & USB_PORT_STAT_LOW_SPEED)
126 : : return "1.5 Mb/s";
127 : : else
128 : : return "12 Mb/s";
129 : : }
130 : :
131 : : /* Note that hdev or one of its children must be locked! */
132 : 2277 : struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev)
133 : : {
134 [ + - + - : 7452 : if (!hdev || !hdev->actconfig || !hdev->maxchild)
+ + # # #
# # # # #
# # # # #
# # # # #
+ - + - +
- # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # + -
+ - + - +
- + - + -
# # # # #
# # # # #
# # # # #
# # # + -
+ - + - +
- + - - +
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# + - + -
+ - ]
135 : : return NULL;
136 : 9315 : return usb_get_intfdata(hdev->actconfig->interface[0]);
137 : : }
138 : :
139 : 0 : int usb_device_supports_lpm(struct usb_device *udev)
140 : : {
141 : : /* Some devices have trouble with LPM */
142 [ # # ]: 0 : if (udev->quirks & USB_QUIRK_NO_LPM)
143 : : return 0;
144 : :
145 : : /* USB 2.1 (and greater) devices indicate LPM support through
146 : : * their USB 2.0 Extended Capabilities BOS descriptor.
147 : : */
148 [ # # ]: 0 : if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) {
149 [ # # # # ]: 0 : if (udev->bos->ext_cap &&
150 : 0 : (USB_LPM_SUPPORT &
151 : 0 : le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
152 : : return 1;
153 : 0 : return 0;
154 : : }
155 : :
156 : : /*
157 : : * According to the USB 3.0 spec, all USB 3.0 devices must support LPM.
158 : : * However, there are some that don't, and they set the U1/U2 exit
159 : : * latencies to zero.
160 : : */
161 [ # # ]: 0 : if (!udev->bos->ss_cap) {
162 : 0 : dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n");
163 : 0 : return 0;
164 : : }
165 : :
166 [ # # # # ]: 0 : if (udev->bos->ss_cap->bU1devExitLat == 0 &&
167 : 0 : udev->bos->ss_cap->bU2DevExitLat == 0) {
168 [ # # ]: 0 : if (udev->parent)
169 : 0 : dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n");
170 : : else
171 : 0 : dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n");
172 : : return 0;
173 : : }
174 : :
175 [ # # # # ]: 0 : if (!udev->parent || udev->parent->lpm_capable)
176 : : return 1;
177 : 0 : return 0;
178 : : }
179 : :
180 : : /*
181 : : * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from
182 : : * either U1 or U2.
183 : : */
184 : : static void usb_set_lpm_mel(struct usb_device *udev,
185 : : struct usb3_lpm_parameters *udev_lpm_params,
186 : : unsigned int udev_exit_latency,
187 : : struct usb_hub *hub,
188 : : struct usb3_lpm_parameters *hub_lpm_params,
189 : : unsigned int hub_exit_latency)
190 : : {
191 : : unsigned int total_mel;
192 : : unsigned int device_mel;
193 : : unsigned int hub_mel;
194 : :
195 : : /*
196 : : * Calculate the time it takes to transition all links from the roothub
197 : : * to the parent hub into U0. The parent hub must then decode the
198 : : * packet (hub header decode latency) to figure out which port it was
199 : : * bound for.
200 : : *
201 : : * The Hub Header decode latency is expressed in 0.1us intervals (0x1
202 : : * means 0.1us). Multiply that by 100 to get nanoseconds.
203 : : */
204 : 0 : total_mel = hub_lpm_params->mel +
205 : 0 : (hub->descriptor->u.ss.bHubHdrDecLat * 100);
206 : :
207 : : /*
208 : : * How long will it take to transition the downstream hub's port into
209 : : * U0? The greater of either the hub exit latency or the device exit
210 : : * latency.
211 : : *
212 : : * The BOS U1/U2 exit latencies are expressed in 1us intervals.
213 : : * Multiply that by 1000 to get nanoseconds.
214 : : */
215 : 0 : device_mel = udev_exit_latency * 1000;
216 : 0 : hub_mel = hub_exit_latency * 1000;
217 [ # # # # ]: 0 : if (device_mel > hub_mel)
218 : 0 : total_mel += device_mel;
219 : : else
220 : 0 : total_mel += hub_mel;
221 : :
222 : 0 : udev_lpm_params->mel = total_mel;
223 : : }
224 : :
225 : : /*
226 : : * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
227 : : * a transition from either U1 or U2.
228 : : */
229 : : static void usb_set_lpm_pel(struct usb_device *udev,
230 : : struct usb3_lpm_parameters *udev_lpm_params,
231 : : unsigned int udev_exit_latency,
232 : : struct usb_hub *hub,
233 : : struct usb3_lpm_parameters *hub_lpm_params,
234 : : unsigned int hub_exit_latency,
235 : : unsigned int port_to_port_exit_latency)
236 : : {
237 : : unsigned int first_link_pel;
238 : : unsigned int hub_pel;
239 : :
240 : : /*
241 : : * First, the device sends an LFPS to transition the link between the
242 : : * device and the parent hub into U0. The exit latency is the bigger of
243 : : * the device exit latency or the hub exit latency.
244 : : */
245 [ # # # # ]: 0 : if (udev_exit_latency > hub_exit_latency)
246 : : first_link_pel = udev_exit_latency * 1000;
247 : : else
248 : : first_link_pel = hub_exit_latency * 1000;
249 : :
250 : : /*
251 : : * When the hub starts to receive the LFPS, there is a slight delay for
252 : : * it to figure out that one of the ports is sending an LFPS. Then it
253 : : * will forward the LFPS to its upstream link. The exit latency is the
254 : : * delay, plus the PEL that we calculated for this hub.
255 : : */
256 : 0 : hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel;
257 : :
258 : : /*
259 : : * According to figure C-7 in the USB 3.0 spec, the PEL for this device
260 : : * is the greater of the two exit latencies.
261 : : */
262 [ # # # # ]: 0 : if (first_link_pel > hub_pel)
263 : 0 : udev_lpm_params->pel = first_link_pel;
264 : : else
265 : 0 : udev_lpm_params->pel = hub_pel;
266 : : }
267 : :
268 : : /*
269 : : * Set the System Exit Latency (SEL) to indicate the total worst-case time from
270 : : * when a device initiates a transition to U0, until when it will receive the
271 : : * first packet from the host controller.
272 : : *
273 : : * Section C.1.5.1 describes the four components to this:
274 : : * - t1: device PEL
275 : : * - t2: time for the ERDY to make it from the device to the host.
276 : : * - t3: a host-specific delay to process the ERDY.
277 : : * - t4: time for the packet to make it from the host to the device.
278 : : *
279 : : * t3 is specific to both the xHCI host and the platform the host is integrated
280 : : * into. The Intel HW folks have said it's negligible, FIXME if a different
281 : : * vendor says otherwise.
282 : : */
283 : : static void usb_set_lpm_sel(struct usb_device *udev,
284 : : struct usb3_lpm_parameters *udev_lpm_params)
285 : : {
286 : : struct usb_device *parent;
287 : : unsigned int num_hubs;
288 : : unsigned int total_sel;
289 : :
290 : : /* t1 = device PEL */
291 : 0 : total_sel = udev_lpm_params->pel;
292 : : /* How many external hubs are in between the device & the root port. */
293 [ # # # # ]: 0 : for (parent = udev->parent, num_hubs = 0; parent->parent;
294 : : parent = parent->parent)
295 : 0 : num_hubs++;
296 : : /* t2 = 2.1us + 250ns * (num_hubs - 1) */
297 [ # # # # ]: 0 : if (num_hubs > 0)
298 : 0 : total_sel += 2100 + 250 * (num_hubs - 1);
299 : :
300 : : /* t4 = 250ns * num_hubs */
301 : 0 : total_sel += 250 * num_hubs;
302 : :
303 : 0 : udev_lpm_params->sel = total_sel;
304 : : }
305 : :
306 : 0 : static void usb_set_lpm_parameters(struct usb_device *udev)
307 : : {
308 : : struct usb_hub *hub;
309 : : unsigned int port_to_port_delay;
310 : : unsigned int udev_u1_del;
311 : : unsigned int udev_u2_del;
312 : : unsigned int hub_u1_del;
313 : : unsigned int hub_u2_del;
314 : :
315 [ # # # # ]: 0 : if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER)
316 : : return;
317 : :
318 : 0 : hub = usb_hub_to_struct_hub(udev->parent);
319 : : /* It doesn't take time to transition the roothub into U0, since it
320 : : * doesn't have an upstream link.
321 : : */
322 [ # # ]: 0 : if (!hub)
323 : : return;
324 : :
325 : 0 : udev_u1_del = udev->bos->ss_cap->bU1devExitLat;
326 : 0 : udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat);
327 : 0 : hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat;
328 : 0 : hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat);
329 : :
330 : : usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del,
331 : : hub, &udev->parent->u1_params, hub_u1_del);
332 : :
333 : : usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del,
334 : : hub, &udev->parent->u2_params, hub_u2_del);
335 : :
336 : : /*
337 : : * Appendix C, section C.2.2.2, says that there is a slight delay from
338 : : * when the parent hub notices the downstream port is trying to
339 : : * transition to U0 to when the hub initiates a U0 transition on its
340 : : * upstream port. The section says the delays are tPort2PortU1EL and
341 : : * tPort2PortU2EL, but it doesn't define what they are.
342 : : *
343 : : * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
344 : : * about the same delays. Use the maximum delay calculations from those
345 : : * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For
346 : : * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I
347 : : * assume the device exit latencies they are talking about are the hub
348 : : * exit latencies.
349 : : *
350 : : * What do we do if the U2 exit latency is less than the U1 exit
351 : : * latency? It's possible, although not likely...
352 : : */
353 : : port_to_port_delay = 1;
354 : :
355 : : usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del,
356 : : hub, &udev->parent->u1_params, hub_u1_del,
357 : : port_to_port_delay);
358 : :
359 [ # # ]: 0 : if (hub_u2_del > hub_u1_del)
360 : 0 : port_to_port_delay = 1 + hub_u2_del - hub_u1_del;
361 : : else
362 : 0 : port_to_port_delay = 1 + hub_u1_del;
363 : :
364 : : usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del,
365 : : hub, &udev->parent->u2_params, hub_u2_del,
366 : : port_to_port_delay);
367 : :
368 : : /* Now that we've got PEL, calculate SEL. */
369 : : usb_set_lpm_sel(udev, &udev->u1_params);
370 : : usb_set_lpm_sel(udev, &udev->u2_params);
371 : : }
372 : :
373 : : /* USB 2.0 spec Section 11.24.4.5 */
374 : 414 : static int get_hub_descriptor(struct usb_device *hdev,
375 : : struct usb_hub_descriptor *desc)
376 : : {
377 : : int i, ret, size;
378 : : unsigned dtype;
379 : :
380 [ + - ]: 414 : if (hub_is_superspeed(hdev)) {
381 : : dtype = USB_DT_SS_HUB;
382 : : size = USB_DT_SS_HUB_SIZE;
383 : : } else {
384 : : dtype = USB_DT_HUB;
385 : : size = sizeof(struct usb_hub_descriptor);
386 : : }
387 : :
388 [ + - ]: 414 : for (i = 0; i < 3; i++) {
389 : 414 : ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
390 : : USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
391 : : dtype << 8, 0, desc, size,
392 : : USB_CTRL_GET_TIMEOUT);
393 [ - + ]: 414 : if (hub_is_superspeed(hdev)) {
394 [ # # ]: 0 : if (ret == size)
395 : 0 : return ret;
396 [ + - ]: 414 : } else if (ret >= USB_DT_HUB_NONVAR_SIZE + 2) {
397 : : /* Make sure we have the DeviceRemovable field. */
398 : 414 : size = USB_DT_HUB_NONVAR_SIZE + desc->bNbrPorts / 8 + 1;
399 [ + - ]: 414 : if (ret < size)
400 : : return -EMSGSIZE;
401 : 414 : return ret;
402 : : }
403 : : }
404 : : return -EINVAL;
405 : : }
406 : :
407 : : /*
408 : : * USB 2.0 spec Section 11.24.2.1
409 : : */
410 : 0 : static int clear_hub_feature(struct usb_device *hdev, int feature)
411 : : {
412 : 0 : return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
413 : : USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
414 : : }
415 : :
416 : : /*
417 : : * USB 2.0 spec Section 11.24.2.2
418 : : */
419 : 2691 : int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature)
420 : : {
421 : 2691 : return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
422 : : USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
423 : : NULL, 0, 1000);
424 : : }
425 : :
426 : : /*
427 : : * USB 2.0 spec Section 11.24.2.13
428 : : */
429 : 2898 : static int set_port_feature(struct usb_device *hdev, int port1, int feature)
430 : : {
431 : 2898 : return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
432 : : USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
433 : : NULL, 0, 1000);
434 : : }
435 : :
436 : : static char *to_led_name(int selector)
437 : : {
438 : : switch (selector) {
439 : : case HUB_LED_AMBER:
440 : : return "amber";
441 : : case HUB_LED_GREEN:
442 : : return "green";
443 : : case HUB_LED_OFF:
444 : : return "off";
445 : : case HUB_LED_AUTO:
446 : : return "auto";
447 : : default:
448 : : return "??";
449 : : }
450 : : }
451 : :
452 : : /*
453 : : * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
454 : : * for info about using port indicators
455 : : */
456 : : static void set_port_led(struct usb_hub *hub, int port1, int selector)
457 : : {
458 : : struct usb_port *port_dev = hub->ports[port1 - 1];
459 : : int status;
460 : :
461 : 0 : status = set_port_feature(hub->hdev, (selector << 8) | port1,
462 : : USB_PORT_FEAT_INDICATOR);
463 : : dev_dbg(&port_dev->dev, "indicator %s status %d\n",
464 : : to_led_name(selector), status);
465 : : }
466 : :
467 : : #define LED_CYCLE_PERIOD ((2*HZ)/3)
468 : :
469 : 0 : static void led_work(struct work_struct *work)
470 : : {
471 : : struct usb_hub *hub =
472 : : container_of(work, struct usb_hub, leds.work);
473 : 0 : struct usb_device *hdev = hub->hdev;
474 : : unsigned i;
475 : : unsigned changed = 0;
476 : : int cursor = -1;
477 : :
478 [ # # # # ]: 0 : if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
479 : 0 : return;
480 : :
481 [ # # ]: 0 : for (i = 0; i < hdev->maxchild; i++) {
482 : : unsigned selector, mode;
483 : :
484 : : /* 30%-50% duty cycle */
485 : :
486 [ # # # # : 0 : switch (hub->indicator[i]) {
# # # # ]
487 : : /* cycle marker */
488 : : case INDICATOR_CYCLE:
489 : 0 : cursor = i;
490 : : selector = HUB_LED_AUTO;
491 : : mode = INDICATOR_AUTO;
492 : 0 : break;
493 : : /* blinking green = sw attention */
494 : : case INDICATOR_GREEN_BLINK:
495 : : selector = HUB_LED_GREEN;
496 : : mode = INDICATOR_GREEN_BLINK_OFF;
497 : : break;
498 : : case INDICATOR_GREEN_BLINK_OFF:
499 : : selector = HUB_LED_OFF;
500 : : mode = INDICATOR_GREEN_BLINK;
501 : 0 : break;
502 : : /* blinking amber = hw attention */
503 : : case INDICATOR_AMBER_BLINK:
504 : : selector = HUB_LED_AMBER;
505 : : mode = INDICATOR_AMBER_BLINK_OFF;
506 : 0 : break;
507 : : case INDICATOR_AMBER_BLINK_OFF:
508 : : selector = HUB_LED_OFF;
509 : : mode = INDICATOR_AMBER_BLINK;
510 : 0 : break;
511 : : /* blink green/amber = reserved */
512 : : case INDICATOR_ALT_BLINK:
513 : : selector = HUB_LED_GREEN;
514 : : mode = INDICATOR_ALT_BLINK_OFF;
515 : 0 : break;
516 : : case INDICATOR_ALT_BLINK_OFF:
517 : : selector = HUB_LED_AMBER;
518 : : mode = INDICATOR_ALT_BLINK;
519 : 0 : break;
520 : : default:
521 : 0 : continue;
522 : : }
523 [ # # ]: 0 : if (selector != HUB_LED_AUTO)
524 : : changed = 1;
525 : 0 : set_port_led(hub, i + 1, selector);
526 : 0 : hub->indicator[i] = mode;
527 : : }
528 [ # # # # ]: 0 : if (!changed && blinkenlights) {
529 : 0 : cursor++;
530 : 0 : cursor %= hdev->maxchild;
531 : 0 : set_port_led(hub, cursor + 1, HUB_LED_GREEN);
532 : 0 : hub->indicator[cursor] = INDICATOR_CYCLE;
533 : 0 : changed++;
534 : : }
535 [ # # ]: 0 : if (changed)
536 : 0 : queue_delayed_work(system_power_efficient_wq,
537 : : &hub->leds, LED_CYCLE_PERIOD);
538 : : }
539 : :
540 : : /* use a short timeout for hub/port status fetches */
541 : : #define USB_STS_TIMEOUT 1000
542 : : #define USB_STS_RETRIES 5
543 : :
544 : : /*
545 : : * USB 2.0 spec Section 11.24.2.6
546 : : */
547 : 414 : static int get_hub_status(struct usb_device *hdev,
548 : : struct usb_hub_status *data)
549 : : {
550 : : int i, status = -ETIMEDOUT;
551 : :
552 [ + - + + ]: 2070 : for (i = 0; i < USB_STS_RETRIES &&
553 : 1242 : (status == -ETIMEDOUT || status == -EPIPE); i++) {
554 : 414 : status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
555 : : USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
556 : : data, sizeof(*data), USB_STS_TIMEOUT);
557 : : }
558 : 414 : return status;
559 : : }
560 : :
561 : : /*
562 : : * USB 2.0 spec Section 11.24.2.7
563 : : * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6
564 : : */
565 : 3945 : static int get_port_status(struct usb_device *hdev, int port1,
566 : : void *data, u16 value, u16 length)
567 : : {
568 : : int i, status = -ETIMEDOUT;
569 : :
570 [ + - + + ]: 19725 : for (i = 0; i < USB_STS_RETRIES &&
571 : 11835 : (status == -ETIMEDOUT || status == -EPIPE); i++) {
572 : 3945 : status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
573 : : USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value,
574 : : port1, data, length, USB_STS_TIMEOUT);
575 : : }
576 : 3945 : return status;
577 : : }
578 : :
579 : 3945 : static int hub_ext_port_status(struct usb_hub *hub, int port1, int type,
580 : : u16 *status, u16 *change, u32 *ext_status)
581 : : {
582 : : int ret;
583 : : int len = 4;
584 : :
585 [ - + ]: 3945 : if (type != HUB_PORT_STATUS)
586 : : len = 8;
587 : :
588 : 3945 : mutex_lock(&hub->status_mutex);
589 : 3945 : ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len);
590 [ - + ]: 3945 : if (ret < len) {
591 [ # # ]: 0 : if (ret != -ENODEV)
592 : 0 : dev_err(hub->intfdev,
593 : : "%s failed (err = %d)\n", __func__, ret);
594 [ # # ]: 0 : if (ret >= 0)
595 : : ret = -EIO;
596 : : } else {
597 : 3945 : *status = le16_to_cpu(hub->status->port.wPortStatus);
598 : 3945 : *change = le16_to_cpu(hub->status->port.wPortChange);
599 [ - + ]: 3945 : if (type != HUB_PORT_STATUS && ext_status)
600 : 0 : *ext_status = le32_to_cpu(
601 : : hub->status->port.dwExtPortStatus);
602 : : ret = 0;
603 : : }
604 : 3945 : mutex_unlock(&hub->status_mutex);
605 : 3945 : return ret;
606 : : }
607 : :
608 : : static int hub_port_status(struct usb_hub *hub, int port1,
609 : : u16 *status, u16 *change)
610 : : {
611 : 3945 : return hub_ext_port_status(hub, port1, HUB_PORT_STATUS,
612 : : status, change, NULL);
613 : : }
614 : :
615 : 219 : static void hub_resubmit_irq_urb(struct usb_hub *hub)
616 : : {
617 : : unsigned long flags;
618 : : int status;
619 : :
620 : 219 : spin_lock_irqsave(&hub->irq_urb_lock, flags);
621 : :
622 [ - + ]: 219 : if (hub->quiescing) {
623 : : spin_unlock_irqrestore(&hub->irq_urb_lock, flags);
624 : 219 : return;
625 : : }
626 : :
627 : 219 : status = usb_submit_urb(hub->urb, GFP_ATOMIC);
628 [ - + # # ]: 219 : if (status && status != -ENODEV && status != -EPERM &&
629 : 0 : status != -ESHUTDOWN) {
630 : 0 : dev_err(hub->intfdev, "resubmit --> %d\n", status);
631 : 0 : mod_timer(&hub->irq_urb_retry, jiffies + HZ);
632 : : }
633 : :
634 : : spin_unlock_irqrestore(&hub->irq_urb_lock, flags);
635 : : }
636 : :
637 : 0 : static void hub_retry_irq_urb(struct timer_list *t)
638 : : {
639 : 0 : struct usb_hub *hub = from_timer(hub, t, irq_urb_retry);
640 : :
641 : 0 : hub_resubmit_irq_urb(hub);
642 : 0 : }
643 : :
644 : :
645 : 633 : static void kick_hub_wq(struct usb_hub *hub)
646 : : {
647 : : struct usb_interface *intf;
648 : :
649 [ + - + - ]: 1266 : if (hub->disconnected || work_pending(&hub->events))
650 : : return;
651 : :
652 : : /*
653 : : * Suppress autosuspend until the event is proceed.
654 : : *
655 : : * Be careful and make sure that the symmetric operation is
656 : : * always called. We are here only when there is no pending
657 : : * work for this hub. Therefore put the interface either when
658 : : * the new work is called or when it is canceled.
659 : : */
660 : 633 : intf = to_usb_interface(hub->intfdev);
661 : 633 : usb_autopm_get_interface_no_resume(intf);
662 : : kref_get(&hub->kref);
663 : :
664 [ - + ]: 1266 : if (queue_work(hub_wq, &hub->events))
665 : : return;
666 : :
667 : : /* the work has already been scheduled */
668 : 0 : usb_autopm_put_interface_async(intf);
669 : 0 : kref_put(&hub->kref, hub_release);
670 : : }
671 : :
672 : 0 : void usb_kick_hub_wq(struct usb_device *hdev)
673 : : {
674 : : struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
675 : :
676 [ # # ]: 0 : if (hub)
677 : 0 : kick_hub_wq(hub);
678 : 0 : }
679 : :
680 : : /*
681 : : * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
682 : : * Notification, which indicates it had initiated remote wakeup.
683 : : *
684 : : * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
685 : : * device initiates resume, so the USB core will not receive notice of the
686 : : * resume through the normal hub interrupt URB.
687 : : */
688 : 0 : void usb_wakeup_notification(struct usb_device *hdev,
689 : : unsigned int portnum)
690 : : {
691 : : struct usb_hub *hub;
692 : : struct usb_port *port_dev;
693 : :
694 [ # # ]: 0 : if (!hdev)
695 : 0 : return;
696 : :
697 : : hub = usb_hub_to_struct_hub(hdev);
698 [ # # ]: 0 : if (hub) {
699 : : port_dev = hub->ports[portnum - 1];
700 : : if (port_dev && port_dev->child)
701 : : pm_wakeup_event(&port_dev->child->dev, 0);
702 : :
703 : 0 : set_bit(portnum, hub->wakeup_bits);
704 : 0 : kick_hub_wq(hub);
705 : : }
706 : : }
707 : : EXPORT_SYMBOL_GPL(usb_wakeup_notification);
708 : :
709 : : /* completion function, fires on port status changes and various faults */
710 : 219 : static void hub_irq(struct urb *urb)
711 : : {
712 : 219 : struct usb_hub *hub = urb->context;
713 : 219 : int status = urb->status;
714 : : unsigned i;
715 : : unsigned long bits;
716 : :
717 [ - + - ]: 219 : switch (status) {
718 : : case -ENOENT: /* synchronous unlink */
719 : : case -ECONNRESET: /* async unlink */
720 : : case -ESHUTDOWN: /* hardware going away */
721 : 219 : return;
722 : :
723 : : default: /* presumably an error */
724 : : /* Cause a hub reset after 10 consecutive errors */
725 : : dev_dbg(hub->intfdev, "transfer --> %d\n", status);
726 [ # # # # ]: 0 : if ((++hub->nerrors < 10) || hub->error)
727 : : goto resubmit;
728 : 0 : hub->error = status;
729 : : /* FALL THROUGH */
730 : :
731 : : /* let hub_wq handle things */
732 : : case 0: /* we got data: port status changed */
733 : : bits = 0;
734 [ + + ]: 438 : for (i = 0; i < urb->actual_length; ++i)
735 : 438 : bits |= ((unsigned long) ((*hub->buffer)[i]))
736 : 219 : << (i*8);
737 : 219 : hub->event_bits[0] = bits;
738 : : break;
739 : : }
740 : :
741 : 219 : hub->nerrors = 0;
742 : :
743 : : /* Something happened, let hub_wq figure it out */
744 : 219 : kick_hub_wq(hub);
745 : :
746 : : resubmit:
747 : 219 : hub_resubmit_irq_urb(hub);
748 : : }
749 : :
750 : : /* USB 2.0 spec Section 11.24.2.3 */
751 : : static inline int
752 : 0 : hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt)
753 : : {
754 : : /* Need to clear both directions for control ep */
755 [ # # ]: 0 : if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) ==
756 : : USB_ENDPOINT_XFER_CONTROL) {
757 : 0 : int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
758 : : HUB_CLEAR_TT_BUFFER, USB_RT_PORT,
759 : : devinfo ^ 0x8000, tt, NULL, 0, 1000);
760 [ # # ]: 0 : if (status)
761 : : return status;
762 : : }
763 : 0 : return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
764 : : HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
765 : : tt, NULL, 0, 1000);
766 : : }
767 : :
768 : : /*
769 : : * enumeration blocks hub_wq for a long time. we use keventd instead, since
770 : : * long blocking there is the exception, not the rule. accordingly, HCDs
771 : : * talking to TTs must queue control transfers (not just bulk and iso), so
772 : : * both can talk to the same hub concurrently.
773 : : */
774 : 0 : static void hub_tt_work(struct work_struct *work)
775 : : {
776 : : struct usb_hub *hub =
777 : : container_of(work, struct usb_hub, tt.clear_work);
778 : : unsigned long flags;
779 : :
780 : 0 : spin_lock_irqsave(&hub->tt.lock, flags);
781 [ # # ]: 0 : while (!list_empty(&hub->tt.clear_list)) {
782 : : struct list_head *next;
783 : : struct usb_tt_clear *clear;
784 : 0 : struct usb_device *hdev = hub->hdev;
785 : : const struct hc_driver *drv;
786 : : int status;
787 : :
788 : 0 : next = hub->tt.clear_list.next;
789 : : clear = list_entry(next, struct usb_tt_clear, clear_list);
790 : : list_del(&clear->clear_list);
791 : :
792 : : /* drop lock so HCD can concurrently report other TT errors */
793 : : spin_unlock_irqrestore(&hub->tt.lock, flags);
794 : 0 : status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt);
795 [ # # ]: 0 : if (status && status != -ENODEV)
796 : 0 : dev_err(&hdev->dev,
797 : : "clear tt %d (%04x) error %d\n",
798 : : clear->tt, clear->devinfo, status);
799 : :
800 : : /* Tell the HCD, even if the operation failed */
801 : 0 : drv = clear->hcd->driver;
802 [ # # ]: 0 : if (drv->clear_tt_buffer_complete)
803 : 0 : (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
804 : :
805 : 0 : kfree(clear);
806 : 0 : spin_lock_irqsave(&hub->tt.lock, flags);
807 : : }
808 : : spin_unlock_irqrestore(&hub->tt.lock, flags);
809 : 0 : }
810 : :
811 : : /**
812 : : * usb_hub_set_port_power - control hub port's power state
813 : : * @hdev: USB device belonging to the usb hub
814 : : * @hub: target hub
815 : : * @port1: port index
816 : : * @set: expected status
817 : : *
818 : : * call this function to control port's power via setting or
819 : : * clearing the port's PORT_POWER feature.
820 : : *
821 : : * Return: 0 if successful. A negative error code otherwise.
822 : : */
823 : 0 : int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
824 : : int port1, bool set)
825 : : {
826 : : int ret;
827 : :
828 [ # # ]: 0 : if (set)
829 : 0 : ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
830 : : else
831 : 0 : ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
832 : :
833 [ # # ]: 0 : if (ret)
834 : : return ret;
835 : :
836 [ # # ]: 0 : if (set)
837 : 0 : set_bit(port1, hub->power_bits);
838 : : else
839 : 0 : clear_bit(port1, hub->power_bits);
840 : : return 0;
841 : : }
842 : :
843 : : /**
844 : : * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
845 : : * @urb: an URB associated with the failed or incomplete split transaction
846 : : *
847 : : * High speed HCDs use this to tell the hub driver that some split control or
848 : : * bulk transaction failed in a way that requires clearing internal state of
849 : : * a transaction translator. This is normally detected (and reported) from
850 : : * interrupt context.
851 : : *
852 : : * It may not be possible for that hub to handle additional full (or low)
853 : : * speed transactions until that state is fully cleared out.
854 : : *
855 : : * Return: 0 if successful. A negative error code otherwise.
856 : : */
857 : 0 : int usb_hub_clear_tt_buffer(struct urb *urb)
858 : : {
859 : 0 : struct usb_device *udev = urb->dev;
860 : 0 : int pipe = urb->pipe;
861 : 0 : struct usb_tt *tt = udev->tt;
862 : : unsigned long flags;
863 : : struct usb_tt_clear *clear;
864 : :
865 : : /* we've got to cope with an arbitrary number of pending TT clears,
866 : : * since each TT has "at least two" buffers that can need it (and
867 : : * there can be many TTs per hub). even if they're uncommon.
868 : : */
869 : : clear = kmalloc(sizeof *clear, GFP_ATOMIC);
870 [ # # ]: 0 : if (clear == NULL) {
871 : 0 : dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
872 : : /* FIXME recover somehow ... RESET_TT? */
873 : 0 : return -ENOMEM;
874 : : }
875 : :
876 : : /* info that CLEAR_TT_BUFFER needs */
877 [ # # ]: 0 : clear->tt = tt->multi ? udev->ttport : 1;
878 : 0 : clear->devinfo = usb_pipeendpoint (pipe);
879 : 0 : clear->devinfo |= ((u16)udev->devaddr) << 4;
880 [ # # ]: 0 : clear->devinfo |= usb_pipecontrol(pipe)
881 : : ? (USB_ENDPOINT_XFER_CONTROL << 11)
882 : : : (USB_ENDPOINT_XFER_BULK << 11);
883 [ # # ]: 0 : if (usb_pipein(pipe))
884 : 0 : clear->devinfo |= 1 << 15;
885 : :
886 : : /* info for completion callback */
887 : 0 : clear->hcd = bus_to_hcd(udev->bus);
888 : 0 : clear->ep = urb->ep;
889 : :
890 : : /* tell keventd to clear state for this TT */
891 : 0 : spin_lock_irqsave(&tt->lock, flags);
892 : 0 : list_add_tail(&clear->clear_list, &tt->clear_list);
893 : 0 : schedule_work(&tt->clear_work);
894 : : spin_unlock_irqrestore(&tt->lock, flags);
895 : 0 : return 0;
896 : : }
897 : : EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
898 : :
899 : 414 : static void hub_power_on(struct usb_hub *hub, bool do_delay)
900 : : {
901 : : int port1;
902 : :
903 : : /* Enable power on each port. Some hubs have reserved values
904 : : * of LPSM (> 2) in their descriptors, even though they are
905 : : * USB 2.0 hubs. Some hubs do not implement port-power switching
906 : : * but only emulate it. In all cases, the ports won't work
907 : : * unless we send these messages to the hub.
908 : : */
909 : : if (hub_is_port_power_switchable(hub))
910 : : dev_dbg(hub->intfdev, "enabling power on all ports\n");
911 : : else
912 : : dev_dbg(hub->intfdev, "trying to enable port power on "
913 : : "non-switchable hub\n");
914 [ + + ]: 1242 : for (port1 = 1; port1 <= hub->hdev->maxchild; port1++)
915 [ + - ]: 2484 : if (test_bit(port1, hub->power_bits))
916 : 1242 : set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
917 : : else
918 : 0 : usb_clear_port_feature(hub->hdev, port1,
919 : : USB_PORT_FEAT_POWER);
920 [ - + ]: 414 : if (do_delay)
921 : 0 : msleep(hub_power_on_good_delay(hub));
922 : 414 : }
923 : :
924 : 414 : static int hub_hub_status(struct usb_hub *hub,
925 : : u16 *status, u16 *change)
926 : : {
927 : : int ret;
928 : :
929 : 414 : mutex_lock(&hub->status_mutex);
930 : 414 : ret = get_hub_status(hub->hdev, &hub->status->hub);
931 [ - + ]: 414 : if (ret < 0) {
932 [ # # ]: 0 : if (ret != -ENODEV)
933 : 0 : dev_err(hub->intfdev,
934 : : "%s failed (err = %d)\n", __func__, ret);
935 : : } else {
936 : 414 : *status = le16_to_cpu(hub->status->hub.wHubStatus);
937 : 414 : *change = le16_to_cpu(hub->status->hub.wHubChange);
938 : : ret = 0;
939 : : }
940 : 414 : mutex_unlock(&hub->status_mutex);
941 : 414 : return ret;
942 : : }
943 : :
944 : : static int hub_set_port_link_state(struct usb_hub *hub, int port1,
945 : : unsigned int link_status)
946 : : {
947 : 0 : return set_port_feature(hub->hdev,
948 : 0 : port1 | (link_status << 3),
949 : : USB_PORT_FEAT_LINK_STATE);
950 : : }
951 : :
952 : : /*
953 : : * Disable a port and mark a logical connect-change event, so that some
954 : : * time later hub_wq will disconnect() any existing usb_device on the port
955 : : * and will re-enumerate if there actually is a device attached.
956 : : */
957 : 0 : static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
958 : : {
959 : : dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n");
960 : 0 : hub_port_disable(hub, port1, 1);
961 : :
962 : : /* FIXME let caller ask to power down the port:
963 : : * - some devices won't enumerate without a VBUS power cycle
964 : : * - SRP saves power that way
965 : : * - ... new call, TBD ...
966 : : * That's easy if this hub can switch power per-port, and
967 : : * hub_wq reactivates the port later (timer, SRP, etc).
968 : : * Powerdown must be optional, because of reset/DFU.
969 : : */
970 : :
971 : 0 : set_bit(port1, hub->change_bits);
972 : 0 : kick_hub_wq(hub);
973 : 0 : }
974 : :
975 : : /**
976 : : * usb_remove_device - disable a device's port on its parent hub
977 : : * @udev: device to be disabled and removed
978 : : * Context: @udev locked, must be able to sleep.
979 : : *
980 : : * After @udev's port has been disabled, hub_wq is notified and it will
981 : : * see that the device has been disconnected. When the device is
982 : : * physically unplugged and something is plugged in, the events will
983 : : * be received and processed normally.
984 : : *
985 : : * Return: 0 if successful. A negative error code otherwise.
986 : : */
987 : 0 : int usb_remove_device(struct usb_device *udev)
988 : : {
989 : : struct usb_hub *hub;
990 : : struct usb_interface *intf;
991 : : int ret;
992 : :
993 [ # # ]: 0 : if (!udev->parent) /* Can't remove a root hub */
994 : : return -EINVAL;
995 : : hub = usb_hub_to_struct_hub(udev->parent);
996 : 0 : intf = to_usb_interface(hub->intfdev);
997 : :
998 : 0 : ret = usb_autopm_get_interface(intf);
999 [ # # ]: 0 : if (ret < 0)
1000 : : return ret;
1001 : :
1002 : 0 : set_bit(udev->portnum, hub->removed_bits);
1003 : 0 : hub_port_logical_disconnect(hub, udev->portnum);
1004 : 0 : usb_autopm_put_interface(intf);
1005 : 0 : return 0;
1006 : : }
1007 : :
1008 : : enum hub_activation_type {
1009 : : HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */
1010 : : HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
1011 : : };
1012 : :
1013 : : static void hub_init_func2(struct work_struct *ws);
1014 : : static void hub_init_func3(struct work_struct *ws);
1015 : :
1016 : 1242 : static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
1017 : : {
1018 : 1242 : struct usb_device *hdev = hub->hdev;
1019 : : struct usb_hcd *hcd;
1020 : : int ret;
1021 : : int port1;
1022 : : int status;
1023 : : bool need_debounce_delay = false;
1024 : : unsigned delay;
1025 : :
1026 : : /* Continue a partial initialization */
1027 [ + + ]: 1242 : if (type == HUB_INIT2 || type == HUB_INIT3) {
1028 : : device_lock(&hdev->dev);
1029 : :
1030 : : /* Was the hub disconnected while we were waiting? */
1031 [ + - ]: 828 : if (hub->disconnected)
1032 : : goto disconnected;
1033 [ + + ]: 828 : if (type == HUB_INIT2)
1034 : : goto init2;
1035 : : goto init3;
1036 : : }
1037 : : kref_get(&hub->kref);
1038 : :
1039 : : /* The superspeed hub except for root hub has to use Hub Depth
1040 : : * value as an offset into the route string to locate the bits
1041 : : * it uses to determine the downstream port number. So hub driver
1042 : : * should send a set hub depth request to superspeed hub after
1043 : : * the superspeed hub is set configuration in initialization or
1044 : : * reset procedure.
1045 : : *
1046 : : * After a resume, port power should still be on.
1047 : : * For any other type of activation, turn it on.
1048 : : */
1049 [ + - ]: 414 : if (type != HUB_RESUME) {
1050 [ + + - + ]: 621 : if (hdev->parent && hub_is_superspeed(hdev)) {
1051 : 0 : ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
1052 : : HUB_SET_DEPTH, USB_RT_HUB,
1053 : 0 : hdev->level - 1, 0, NULL, 0,
1054 : : USB_CTRL_SET_TIMEOUT);
1055 [ # # ]: 0 : if (ret < 0)
1056 : 0 : dev_err(hub->intfdev,
1057 : : "set hub depth failed\n");
1058 : : }
1059 : :
1060 : : /* Speed up system boot by using a delayed_work for the
1061 : : * hub's initial power-up delays. This is pretty awkward
1062 : : * and the implementation looks like a home-brewed sort of
1063 : : * setjmp/longjmp, but it saves at least 100 ms for each
1064 : : * root hub (assuming usbcore is compiled into the kernel
1065 : : * rather than as a module). It adds up.
1066 : : *
1067 : : * This can't be done for HUB_RESUME or HUB_RESET_RESUME
1068 : : * because for those activation types the ports have to be
1069 : : * operational when we return. In theory this could be done
1070 : : * for HUB_POST_RESET, but it's easier not to.
1071 : : */
1072 [ + - ]: 414 : if (type == HUB_INIT) {
1073 : : delay = hub_power_on_good_delay(hub);
1074 : :
1075 : 414 : hub_power_on(hub, false);
1076 : 828 : INIT_DELAYED_WORK(&hub->init_work, hub_init_func2);
1077 : 414 : queue_delayed_work(system_power_efficient_wq,
1078 : : &hub->init_work,
1079 : : msecs_to_jiffies(delay));
1080 : :
1081 : : /* Suppress autosuspend until init is done */
1082 : 414 : usb_autopm_get_interface_no_resume(
1083 : 414 : to_usb_interface(hub->intfdev));
1084 : 414 : return; /* Continues at init2: below */
1085 [ # # ]: 0 : } else if (type == HUB_RESET_RESUME) {
1086 : : /* The internal host controller state for the hub device
1087 : : * may be gone after a host power loss on system resume.
1088 : : * Update the device's info so the HW knows it's a hub.
1089 : : */
1090 : 0 : hcd = bus_to_hcd(hdev->bus);
1091 [ # # ]: 0 : if (hcd->driver->update_hub_device) {
1092 : 0 : ret = hcd->driver->update_hub_device(hcd, hdev,
1093 : : &hub->tt, GFP_NOIO);
1094 [ # # ]: 0 : if (ret < 0) {
1095 : 0 : dev_err(hub->intfdev,
1096 : : "Host not accepting hub info update\n");
1097 : 0 : dev_err(hub->intfdev,
1098 : : "LS/FS devices and hubs may not work under this hub\n");
1099 : : }
1100 : : }
1101 : 0 : hub_power_on(hub, true);
1102 : : } else {
1103 : 0 : hub_power_on(hub, true);
1104 : : }
1105 : : }
1106 : : init2:
1107 : :
1108 : : /*
1109 : : * Check each port and set hub->change_bits to let hub_wq know
1110 : : * which ports need attention.
1111 : : */
1112 [ + + ]: 1242 : for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
1113 : 1242 : struct usb_port *port_dev = hub->ports[port1 - 1];
1114 : 1242 : struct usb_device *udev = port_dev->child;
1115 : : u16 portstatus, portchange;
1116 : :
1117 : 1242 : portstatus = portchange = 0;
1118 : : status = hub_port_status(hub, port1, &portstatus, &portchange);
1119 [ + - ]: 1242 : if (status)
1120 : : goto abort;
1121 : :
1122 : : if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
1123 : : dev_dbg(&port_dev->dev, "status %04x change %04x\n",
1124 : : portstatus, portchange);
1125 : :
1126 : : /*
1127 : : * After anything other than HUB_RESUME (i.e., initialization
1128 : : * or any sort of reset), every port should be disabled.
1129 : : * Unconnected ports should likewise be disabled (paranoia),
1130 : : * and so should ports for which we have no usb_device.
1131 : : */
1132 [ - + # # ]: 1242 : if ((portstatus & USB_PORT_STAT_ENABLE) && (
1133 [ # # ]: 0 : type != HUB_RESUME ||
1134 [ # # ]: 0 : !(portstatus & USB_PORT_STAT_CONNECTION) ||
1135 [ # # ]: 0 : !udev ||
1136 : 0 : udev->state == USB_STATE_NOTATTACHED)) {
1137 : : /*
1138 : : * USB3 protocol ports will automatically transition
1139 : : * to Enabled state when detect an USB3.0 device attach.
1140 : : * Do not disable USB3 protocol ports, just pretend
1141 : : * power was lost
1142 : : */
1143 : 0 : portstatus &= ~USB_PORT_STAT_ENABLE;
1144 [ # # ]: 0 : if (!hub_is_superspeed(hdev))
1145 : 0 : usb_clear_port_feature(hdev, port1,
1146 : : USB_PORT_FEAT_ENABLE);
1147 : : }
1148 : :
1149 : : /* Make sure a warm-reset request is handled by port_event */
1150 [ - + # # ]: 1242 : if (type == HUB_RESUME &&
1151 : 0 : hub_port_warm_reset_required(hub, port1, portstatus))
1152 : 0 : set_bit(port1, hub->event_bits);
1153 : :
1154 : : /*
1155 : : * Add debounce if USB3 link is in polling/link training state.
1156 : : * Link will automatically transition to Enabled state after
1157 : : * link training completes.
1158 : : */
1159 [ - + # # ]: 1242 : if (hub_is_superspeed(hdev) &&
1160 : 0 : ((portstatus & USB_PORT_STAT_LINK_STATE) ==
1161 : : USB_SS_PORT_LS_POLLING))
1162 : : need_debounce_delay = true;
1163 : :
1164 : : /* Clear status-change flags; we'll debounce later */
1165 [ + + ]: 1242 : if (portchange & USB_PORT_STAT_C_CONNECTION) {
1166 : : need_debounce_delay = true;
1167 : 828 : usb_clear_port_feature(hub->hdev, port1,
1168 : : USB_PORT_FEAT_C_CONNECTION);
1169 : : }
1170 [ - + ]: 1242 : if (portchange & USB_PORT_STAT_C_ENABLE) {
1171 : : need_debounce_delay = true;
1172 : 0 : usb_clear_port_feature(hub->hdev, port1,
1173 : : USB_PORT_FEAT_C_ENABLE);
1174 : : }
1175 [ - + ]: 1242 : if (portchange & USB_PORT_STAT_C_RESET) {
1176 : : need_debounce_delay = true;
1177 : 0 : usb_clear_port_feature(hub->hdev, port1,
1178 : : USB_PORT_FEAT_C_RESET);
1179 : : }
1180 [ - + # # ]: 1242 : if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
1181 : 0 : hub_is_superspeed(hub->hdev)) {
1182 : : need_debounce_delay = true;
1183 : 0 : usb_clear_port_feature(hub->hdev, port1,
1184 : : USB_PORT_FEAT_C_BH_PORT_RESET);
1185 : : }
1186 : : /* We can forget about a "removed" device when there's a
1187 : : * physical disconnect or the connect status changes.
1188 : : */
1189 [ + + + - ]: 2070 : if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
1190 : 828 : (portchange & USB_PORT_STAT_C_CONNECTION))
1191 : 1242 : clear_bit(port1, hub->removed_bits);
1192 : :
1193 [ - + # # ]: 1242 : if (!udev || udev->state == USB_STATE_NOTATTACHED) {
1194 : : /* Tell hub_wq to disconnect the device or
1195 : : * check for a new connection or over current condition.
1196 : : * Based on USB2.0 Spec Section 11.12.5,
1197 : : * C_PORT_OVER_CURRENT could be set while
1198 : : * PORT_OVER_CURRENT is not. So check for any of them.
1199 : : */
1200 [ + - + + : 1656 : if (udev || (portstatus & USB_PORT_STAT_CONNECTION) ||
+ - ]
1201 [ + - ]: 828 : (portchange & USB_PORT_STAT_C_CONNECTION) ||
1202 [ - + ]: 828 : (portstatus & USB_PORT_STAT_OVERCURRENT) ||
1203 : 414 : (portchange & USB_PORT_STAT_C_OVERCURRENT))
1204 : 828 : set_bit(port1, hub->change_bits);
1205 : :
1206 [ # # ]: 0 : } else if (portstatus & USB_PORT_STAT_ENABLE) {
1207 : 0 : bool port_resumed = (portstatus &
1208 : : USB_PORT_STAT_LINK_STATE) ==
1209 : : USB_SS_PORT_LS_U0;
1210 : : /* The power session apparently survived the resume.
1211 : : * If there was an overcurrent or suspend change
1212 : : * (i.e., remote wakeup request), have hub_wq
1213 : : * take care of it. Look at the port link state
1214 : : * for USB 3.0 hubs, since they don't have a suspend
1215 : : * change bit, and they don't set the port link change
1216 : : * bit on device-initiated resume.
1217 : : */
1218 [ # # # # : 0 : if (portchange || (hub_is_superspeed(hub->hdev) &&
# # ]
1219 : : port_resumed))
1220 : 0 : set_bit(port1, hub->change_bits);
1221 : :
1222 [ # # ]: 0 : } else if (udev->persist_enabled) {
1223 : : #ifdef CONFIG_PM
1224 : 0 : udev->reset_resume = 1;
1225 : : #endif
1226 : : /* Don't set the change_bits when the device
1227 : : * was powered off.
1228 : : */
1229 [ # # ]: 0 : if (test_bit(port1, hub->power_bits))
1230 : 0 : set_bit(port1, hub->change_bits);
1231 : :
1232 : : } else {
1233 : : /* The power session is gone; tell hub_wq */
1234 : 0 : usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1235 : 0 : set_bit(port1, hub->change_bits);
1236 : : }
1237 : : }
1238 : :
1239 : : /* If no port-status-change flags were set, we don't need any
1240 : : * debouncing. If flags were set we can try to debounce the
1241 : : * ports all at once right now, instead of letting hub_wq do them
1242 : : * one at a time later on.
1243 : : *
1244 : : * If any port-status changes do occur during this delay, hub_wq
1245 : : * will see them later and handle them normally.
1246 : : */
1247 [ + - ]: 414 : if (need_debounce_delay) {
1248 : : delay = HUB_DEBOUNCE_STABLE;
1249 : :
1250 : : /* Don't do a long sleep inside a workqueue routine */
1251 [ + - ]: 414 : if (type == HUB_INIT2) {
1252 : 828 : INIT_DELAYED_WORK(&hub->init_work, hub_init_func3);
1253 : 414 : queue_delayed_work(system_power_efficient_wq,
1254 : : &hub->init_work,
1255 : : msecs_to_jiffies(delay));
1256 : : device_unlock(&hdev->dev);
1257 : : return; /* Continues at init3: below */
1258 : : } else {
1259 : 0 : msleep(delay);
1260 : : }
1261 : : }
1262 : : init3:
1263 : 414 : hub->quiescing = 0;
1264 : :
1265 : 414 : status = usb_submit_urb(hub->urb, GFP_NOIO);
1266 [ - + ]: 414 : if (status < 0)
1267 : 0 : dev_err(hub->intfdev, "activate --> %d\n", status);
1268 [ - + # # ]: 414 : if (hub->has_indicators && blinkenlights)
1269 : 0 : queue_delayed_work(system_power_efficient_wq,
1270 : : &hub->leds, LED_CYCLE_PERIOD);
1271 : :
1272 : : /* Scan all ports that need attention */
1273 : 414 : kick_hub_wq(hub);
1274 : : abort:
1275 [ + - ]: 414 : if (type == HUB_INIT2 || type == HUB_INIT3) {
1276 : : /* Allow autosuspend if it was suppressed */
1277 : : disconnected:
1278 : 414 : usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
1279 : : device_unlock(&hdev->dev);
1280 : : }
1281 : :
1282 : 414 : kref_put(&hub->kref, hub_release);
1283 : : }
1284 : :
1285 : : /* Implement the continuations for the delays above */
1286 : 414 : static void hub_init_func2(struct work_struct *ws)
1287 : : {
1288 : 414 : struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
1289 : :
1290 : 414 : hub_activate(hub, HUB_INIT2);
1291 : 414 : }
1292 : :
1293 : 414 : static void hub_init_func3(struct work_struct *ws)
1294 : : {
1295 : 414 : struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
1296 : :
1297 : 414 : hub_activate(hub, HUB_INIT3);
1298 : 414 : }
1299 : :
1300 : : enum hub_quiescing_type {
1301 : : HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
1302 : : };
1303 : :
1304 : 0 : static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
1305 : : {
1306 : 0 : struct usb_device *hdev = hub->hdev;
1307 : : unsigned long flags;
1308 : : int i;
1309 : :
1310 : : /* hub_wq and related activity won't re-trigger */
1311 : 0 : spin_lock_irqsave(&hub->irq_urb_lock, flags);
1312 : 0 : hub->quiescing = 1;
1313 : : spin_unlock_irqrestore(&hub->irq_urb_lock, flags);
1314 : :
1315 [ # # ]: 0 : if (type != HUB_SUSPEND) {
1316 : : /* Disconnect all the children */
1317 [ # # ]: 0 : for (i = 0; i < hdev->maxchild; ++i) {
1318 [ # # ]: 0 : if (hub->ports[i]->child)
1319 : 0 : usb_disconnect(&hub->ports[i]->child);
1320 : : }
1321 : : }
1322 : :
1323 : : /* Stop hub_wq and related activity */
1324 : 0 : del_timer_sync(&hub->irq_urb_retry);
1325 : 0 : usb_kill_urb(hub->urb);
1326 [ # # ]: 0 : if (hub->has_indicators)
1327 : 0 : cancel_delayed_work_sync(&hub->leds);
1328 [ # # ]: 0 : if (hub->tt.hub)
1329 : 0 : flush_work(&hub->tt.clear_work);
1330 : 0 : }
1331 : :
1332 : 0 : static void hub_pm_barrier_for_all_ports(struct usb_hub *hub)
1333 : : {
1334 : : int i;
1335 : :
1336 [ # # ]: 0 : for (i = 0; i < hub->hdev->maxchild; ++i)
1337 : 0 : pm_runtime_barrier(&hub->ports[i]->dev);
1338 : 0 : }
1339 : :
1340 : : /* caller has locked the hub device */
1341 : 0 : static int hub_pre_reset(struct usb_interface *intf)
1342 : : {
1343 : : struct usb_hub *hub = usb_get_intfdata(intf);
1344 : :
1345 : 0 : hub_quiesce(hub, HUB_PRE_RESET);
1346 : 0 : hub->in_reset = 1;
1347 : 0 : hub_pm_barrier_for_all_ports(hub);
1348 : 0 : return 0;
1349 : : }
1350 : :
1351 : : /* caller has locked the hub device */
1352 : 0 : static int hub_post_reset(struct usb_interface *intf)
1353 : : {
1354 : : struct usb_hub *hub = usb_get_intfdata(intf);
1355 : :
1356 : 0 : hub->in_reset = 0;
1357 : 0 : hub_pm_barrier_for_all_ports(hub);
1358 : 0 : hub_activate(hub, HUB_POST_RESET);
1359 : 0 : return 0;
1360 : : }
1361 : :
1362 : 414 : static int hub_configure(struct usb_hub *hub,
1363 : : struct usb_endpoint_descriptor *endpoint)
1364 : : {
1365 : : struct usb_hcd *hcd;
1366 : 414 : struct usb_device *hdev = hub->hdev;
1367 : 414 : struct device *hub_dev = hub->intfdev;
1368 : : u16 hubstatus, hubchange;
1369 : : u16 wHubCharacteristics;
1370 : : unsigned int pipe;
1371 : : int maxp, ret, i;
1372 : : char *message = "out of memory";
1373 : : unsigned unit_load;
1374 : : unsigned full_load;
1375 : : unsigned maxchild;
1376 : :
1377 : 414 : hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
1378 [ + - ]: 414 : if (!hub->buffer) {
1379 : : ret = -ENOMEM;
1380 : : goto fail;
1381 : : }
1382 : :
1383 : 414 : hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
1384 [ + - ]: 414 : if (!hub->status) {
1385 : : ret = -ENOMEM;
1386 : : goto fail;
1387 : : }
1388 : 414 : mutex_init(&hub->status_mutex);
1389 : :
1390 : 414 : hub->descriptor = kzalloc(sizeof(*hub->descriptor), GFP_KERNEL);
1391 [ + - ]: 414 : if (!hub->descriptor) {
1392 : : ret = -ENOMEM;
1393 : : goto fail;
1394 : : }
1395 : :
1396 : : /* Request the entire hub descriptor.
1397 : : * hub->descriptor can handle USB_MAXCHILDREN ports,
1398 : : * but a (non-SS) hub can/will return fewer bytes here.
1399 : : */
1400 : 414 : ret = get_hub_descriptor(hdev, hub->descriptor);
1401 [ + - ]: 414 : if (ret < 0) {
1402 : : message = "can't read hub descriptor";
1403 : : goto fail;
1404 : : }
1405 : :
1406 : : maxchild = USB_MAXCHILDREN;
1407 [ - + ]: 414 : if (hub_is_superspeed(hdev))
1408 : : maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS);
1409 : :
1410 [ + - ]: 414 : if (hub->descriptor->bNbrPorts > maxchild) {
1411 : : message = "hub has too many ports!";
1412 : : ret = -ENODEV;
1413 : : goto fail;
1414 [ + - ]: 414 : } else if (hub->descriptor->bNbrPorts == 0) {
1415 : : message = "hub doesn't have any ports!";
1416 : : ret = -ENODEV;
1417 : : goto fail;
1418 : : }
1419 : :
1420 : : /*
1421 : : * Accumulate wHubDelay + 40ns for every hub in the tree of devices.
1422 : : * The resulting value will be used for SetIsochDelay() request.
1423 : : */
1424 [ + - - + ]: 828 : if (hub_is_superspeed(hdev) || hub_is_superspeedplus(hdev)) {
1425 : 0 : u32 delay = __le16_to_cpu(hub->descriptor->u.ss.wHubDelay);
1426 : :
1427 [ # # ]: 0 : if (hdev->parent)
1428 : 0 : delay += hdev->parent->hub_delay;
1429 : :
1430 : 0 : delay += USB_TP_TRANSMISSION_DELAY;
1431 : 0 : hdev->hub_delay = min_t(u32, delay, USB_TP_TRANSMISSION_DELAY_MAX);
1432 : : }
1433 : :
1434 : 414 : maxchild = hub->descriptor->bNbrPorts;
1435 [ + + ]: 414 : dev_info(hub_dev, "%d port%s detected\n", maxchild,
1436 : : (maxchild == 1) ? "" : "s");
1437 : :
1438 : 414 : hub->ports = kcalloc(maxchild, sizeof(struct usb_port *), GFP_KERNEL);
1439 [ + - ]: 414 : if (!hub->ports) {
1440 : : ret = -ENOMEM;
1441 : : goto fail;
1442 : : }
1443 : :
1444 : 414 : wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1445 [ + - ]: 414 : if (hub_is_superspeed(hdev)) {
1446 : : unit_load = 150;
1447 : : full_load = 900;
1448 : : } else {
1449 : : unit_load = 100;
1450 : : full_load = 500;
1451 : : }
1452 : :
1453 : : /* FIXME for USB 3.0, skip for now */
1454 [ + + + - ]: 414 : if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
1455 : 207 : !(hub_is_superspeed(hdev))) {
1456 : : char portstr[USB_MAXCHILDREN + 1];
1457 : :
1458 : : for (i = 0; i < maxchild; i++)
1459 : : portstr[i] = hub->descriptor->u.hs.DeviceRemovable
1460 : : [((i + 1) / 8)] & (1 << ((i + 1) % 8))
1461 : : ? 'F' : 'R';
1462 : : portstr[maxchild] = 0;
1463 : : dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
1464 : : } else
1465 : : dev_dbg(hub_dev, "standalone hub\n");
1466 : :
1467 : : switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1468 : : case HUB_CHAR_COMMON_LPSM:
1469 : : dev_dbg(hub_dev, "ganged power switching\n");
1470 : : break;
1471 : : case HUB_CHAR_INDV_PORT_LPSM:
1472 : : dev_dbg(hub_dev, "individual port power switching\n");
1473 : : break;
1474 : : case HUB_CHAR_NO_LPSM:
1475 : : case HUB_CHAR_LPSM:
1476 : : dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
1477 : : break;
1478 : : }
1479 : :
1480 : : switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1481 : : case HUB_CHAR_COMMON_OCPM:
1482 : : dev_dbg(hub_dev, "global over-current protection\n");
1483 : : break;
1484 : : case HUB_CHAR_INDV_PORT_OCPM:
1485 : : dev_dbg(hub_dev, "individual port over-current protection\n");
1486 : : break;
1487 : : case HUB_CHAR_NO_OCPM:
1488 : : case HUB_CHAR_OCPM:
1489 : : dev_dbg(hub_dev, "no over-current protection\n");
1490 : : break;
1491 : : }
1492 : :
1493 : 414 : spin_lock_init(&hub->tt.lock);
1494 : 414 : INIT_LIST_HEAD(&hub->tt.clear_list);
1495 : 828 : INIT_WORK(&hub->tt.clear_work, hub_tt_work);
1496 [ + + - ]: 414 : switch (hdev->descriptor.bDeviceProtocol) {
1497 : : case USB_HUB_PR_FS:
1498 : : break;
1499 : : case USB_HUB_PR_HS_SINGLE_TT:
1500 : : dev_dbg(hub_dev, "Single TT\n");
1501 : 207 : hub->tt.hub = hdev;
1502 : 207 : break;
1503 : : case USB_HUB_PR_HS_MULTI_TT:
1504 : 207 : ret = usb_set_interface(hdev, 0, 1);
1505 [ + - ]: 207 : if (ret == 0) {
1506 : : dev_dbg(hub_dev, "TT per port\n");
1507 : 207 : hub->tt.multi = 1;
1508 : : } else
1509 : 0 : dev_err(hub_dev, "Using single TT (err %d)\n",
1510 : : ret);
1511 : 207 : hub->tt.hub = hdev;
1512 : 207 : break;
1513 : : case USB_HUB_PR_SS:
1514 : : /* USB 3.0 hubs don't have a TT */
1515 : : break;
1516 : : default:
1517 : : dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
1518 : : hdev->descriptor.bDeviceProtocol);
1519 : : break;
1520 : : }
1521 : :
1522 : : /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1523 [ + - - - : 414 : switch (wHubCharacteristics & HUB_CHAR_TTTT) {
- ]
1524 : : case HUB_TTTT_8_BITS:
1525 [ + - ]: 414 : if (hdev->descriptor.bDeviceProtocol != 0) {
1526 : 414 : hub->tt.think_time = 666;
1527 : : dev_dbg(hub_dev, "TT requires at most %d "
1528 : : "FS bit times (%d ns)\n",
1529 : : 8, hub->tt.think_time);
1530 : : }
1531 : : break;
1532 : : case HUB_TTTT_16_BITS:
1533 : 0 : hub->tt.think_time = 666 * 2;
1534 : : dev_dbg(hub_dev, "TT requires at most %d "
1535 : : "FS bit times (%d ns)\n",
1536 : : 16, hub->tt.think_time);
1537 : 0 : break;
1538 : : case HUB_TTTT_24_BITS:
1539 : 0 : hub->tt.think_time = 666 * 3;
1540 : : dev_dbg(hub_dev, "TT requires at most %d "
1541 : : "FS bit times (%d ns)\n",
1542 : : 24, hub->tt.think_time);
1543 : 0 : break;
1544 : : case HUB_TTTT_32_BITS:
1545 : 0 : hub->tt.think_time = 666 * 4;
1546 : : dev_dbg(hub_dev, "TT requires at most %d "
1547 : : "FS bit times (%d ns)\n",
1548 : : 32, hub->tt.think_time);
1549 : 0 : break;
1550 : : }
1551 : :
1552 : : /* probe() zeroes hub->indicator[] */
1553 [ - + ]: 414 : if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1554 : 0 : hub->has_indicators = 1;
1555 : : dev_dbg(hub_dev, "Port indicators are supported\n");
1556 : : }
1557 : :
1558 : : dev_dbg(hub_dev, "power on to power good time: %dms\n",
1559 : : hub->descriptor->bPwrOn2PwrGood * 2);
1560 : :
1561 : : /* power budgeting mostly matters with bus-powered hubs,
1562 : : * and battery-powered root hubs (may provide just 8 mA).
1563 : : */
1564 : : ret = usb_get_std_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
1565 [ + - ]: 414 : if (ret) {
1566 : : message = "can't get hub status";
1567 : : goto fail;
1568 : : }
1569 : 414 : hcd = bus_to_hcd(hdev->bus);
1570 [ + + ]: 414 : if (hdev == hdev->bus->root_hub) {
1571 [ - + ]: 207 : if (hcd->power_budget > 0)
1572 : 0 : hdev->bus_mA = hcd->power_budget;
1573 : : else
1574 : 207 : hdev->bus_mA = full_load * maxchild;
1575 [ + - ]: 207 : if (hdev->bus_mA >= full_load)
1576 : 207 : hub->mA_per_port = full_load;
1577 : : else {
1578 : 0 : hub->mA_per_port = hdev->bus_mA;
1579 : 0 : hub->limited_power = 1;
1580 : : }
1581 [ - + ]: 207 : } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1582 : 0 : int remaining = hdev->bus_mA -
1583 : 0 : hub->descriptor->bHubContrCurrent;
1584 : :
1585 : : dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
1586 : : hub->descriptor->bHubContrCurrent);
1587 : 0 : hub->limited_power = 1;
1588 : :
1589 [ # # ]: 0 : if (remaining < maxchild * unit_load)
1590 : 0 : dev_warn(hub_dev,
1591 : : "insufficient power available "
1592 : : "to use all downstream ports\n");
1593 : 0 : hub->mA_per_port = unit_load; /* 7.2.1 */
1594 : :
1595 : : } else { /* Self-powered external hub */
1596 : : /* FIXME: What about battery-powered external hubs that
1597 : : * provide less current per port? */
1598 : 207 : hub->mA_per_port = full_load;
1599 : : }
1600 : : if (hub->mA_per_port < full_load)
1601 : : dev_dbg(hub_dev, "%umA bus power budget for each child\n",
1602 : : hub->mA_per_port);
1603 : :
1604 : 414 : ret = hub_hub_status(hub, &hubstatus, &hubchange);
1605 [ + - ]: 414 : if (ret < 0) {
1606 : : message = "can't get hub status";
1607 : : goto fail;
1608 : : }
1609 : :
1610 : : /* local power status reports aren't always correct */
1611 : : if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
1612 : : dev_dbg(hub_dev, "local power source is %s\n",
1613 : : (hubstatus & HUB_STATUS_LOCAL_POWER)
1614 : : ? "lost (inactive)" : "good");
1615 : :
1616 : : if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1617 : : dev_dbg(hub_dev, "%sover-current condition exists\n",
1618 : : (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
1619 : :
1620 : : /* set up the interrupt endpoint
1621 : : * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1622 : : * bytes as USB2.0[11.12.3] says because some hubs are known
1623 : : * to send more data (and thus cause overflow). For root hubs,
1624 : : * maxpktsize is defined in hcd.c's fake endpoint descriptors
1625 : : * to be big enough for at least USB_MAXCHILDREN ports. */
1626 : 828 : pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
1627 : 414 : maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
1628 : :
1629 [ - + ]: 414 : if (maxp > sizeof(*hub->buffer))
1630 : : maxp = sizeof(*hub->buffer);
1631 : :
1632 : 414 : hub->urb = usb_alloc_urb(0, GFP_KERNEL);
1633 [ + - ]: 414 : if (!hub->urb) {
1634 : : ret = -ENOMEM;
1635 : : goto fail;
1636 : : }
1637 : :
1638 : 828 : usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
1639 : 414 : hub, endpoint->bInterval);
1640 : :
1641 : : /* maybe cycle the hub leds */
1642 [ - + # # ]: 414 : if (hub->has_indicators && blinkenlights)
1643 : 0 : hub->indicator[0] = INDICATOR_CYCLE;
1644 : :
1645 : 414 : mutex_lock(&usb_port_peer_mutex);
1646 [ + + ]: 2070 : for (i = 0; i < maxchild; i++) {
1647 : 1242 : ret = usb_hub_create_port_device(hub, i + 1);
1648 [ - + ]: 1242 : if (ret < 0) {
1649 : 0 : dev_err(hub->intfdev,
1650 : : "couldn't create port%d device.\n", i + 1);
1651 : 0 : break;
1652 : : }
1653 : : }
1654 : 414 : hdev->maxchild = i;
1655 [ + + ]: 1656 : for (i = 0; i < hdev->maxchild; i++) {
1656 : 1242 : struct usb_port *port_dev = hub->ports[i];
1657 : :
1658 : 1242 : pm_runtime_put(&port_dev->dev);
1659 : : }
1660 : :
1661 : 414 : mutex_unlock(&usb_port_peer_mutex);
1662 [ + - ]: 414 : if (ret < 0)
1663 : : goto fail;
1664 : :
1665 : : /* Update the HCD's internal representation of this hub before hub_wq
1666 : : * starts getting port status changes for devices under the hub.
1667 : : */
1668 [ - + ]: 414 : if (hcd->driver->update_hub_device) {
1669 : 0 : ret = hcd->driver->update_hub_device(hcd, hdev,
1670 : : &hub->tt, GFP_KERNEL);
1671 [ # # ]: 0 : if (ret < 0) {
1672 : : message = "can't update HCD hub info";
1673 : : goto fail;
1674 : : }
1675 : : }
1676 : :
1677 : 414 : usb_hub_adjust_deviceremovable(hdev, hub->descriptor);
1678 : :
1679 : 414 : hub_activate(hub, HUB_INIT);
1680 : 414 : return 0;
1681 : :
1682 : : fail:
1683 : 0 : dev_err(hub_dev, "config failed, %s (err %d)\n",
1684 : : message, ret);
1685 : : /* hub_disconnect() frees urb and descriptor */
1686 : 0 : return ret;
1687 : : }
1688 : :
1689 : 0 : static void hub_release(struct kref *kref)
1690 : : {
1691 : 0 : struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1692 : :
1693 : 0 : usb_put_dev(hub->hdev);
1694 : 0 : usb_put_intf(to_usb_interface(hub->intfdev));
1695 : 0 : kfree(hub);
1696 : 0 : }
1697 : :
1698 : : static unsigned highspeed_hubs;
1699 : :
1700 : 0 : static void hub_disconnect(struct usb_interface *intf)
1701 : : {
1702 : : struct usb_hub *hub = usb_get_intfdata(intf);
1703 : : struct usb_device *hdev = interface_to_usbdev(intf);
1704 : : int port1;
1705 : :
1706 : : /*
1707 : : * Stop adding new hub events. We do not want to block here and thus
1708 : : * will not try to remove any pending work item.
1709 : : */
1710 : 0 : hub->disconnected = 1;
1711 : :
1712 : : /* Disconnect all children and quiesce the hub */
1713 : 0 : hub->error = 0;
1714 : 0 : hub_quiesce(hub, HUB_DISCONNECT);
1715 : :
1716 : 0 : mutex_lock(&usb_port_peer_mutex);
1717 : :
1718 : : /* Avoid races with recursively_mark_NOTATTACHED() */
1719 : : spin_lock_irq(&device_state_lock);
1720 : 0 : port1 = hdev->maxchild;
1721 : 0 : hdev->maxchild = 0;
1722 : : usb_set_intfdata(intf, NULL);
1723 : : spin_unlock_irq(&device_state_lock);
1724 : :
1725 [ # # ]: 0 : for (; port1 > 0; --port1)
1726 : 0 : usb_hub_remove_port_device(hub, port1);
1727 : :
1728 : 0 : mutex_unlock(&usb_port_peer_mutex);
1729 : :
1730 [ # # ]: 0 : if (hub->hdev->speed == USB_SPEED_HIGH)
1731 : 0 : highspeed_hubs--;
1732 : :
1733 : 0 : usb_free_urb(hub->urb);
1734 : 0 : kfree(hub->ports);
1735 : 0 : kfree(hub->descriptor);
1736 : 0 : kfree(hub->status);
1737 : 0 : kfree(hub->buffer);
1738 : :
1739 : : pm_suspend_ignore_children(&intf->dev, false);
1740 : :
1741 [ # # ]: 0 : if (hub->quirk_disable_autosuspend)
1742 : 0 : usb_autopm_put_interface(intf);
1743 : :
1744 : 0 : kref_put(&hub->kref, hub_release);
1745 : 0 : }
1746 : :
1747 : 414 : static bool hub_descriptor_is_sane(struct usb_host_interface *desc)
1748 : : {
1749 : : /* Some hubs have a subclass of 1, which AFAICT according to the */
1750 : : /* specs is not defined, but it works */
1751 [ + - ]: 414 : if (desc->desc.bInterfaceSubClass != 0 &&
1752 : : desc->desc.bInterfaceSubClass != 1)
1753 : : return false;
1754 : :
1755 : : /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1756 [ + - ]: 414 : if (desc->desc.bNumEndpoints != 1)
1757 : : return false;
1758 : :
1759 : : /* If the first endpoint is not interrupt IN, we'd better punt! */
1760 [ + - ]: 828 : if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc))
1761 : : return false;
1762 : :
1763 : 414 : return true;
1764 : : }
1765 : :
1766 : 414 : static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1767 : : {
1768 : : struct usb_host_interface *desc;
1769 : : struct usb_device *hdev;
1770 : : struct usb_hub *hub;
1771 : :
1772 : 414 : desc = intf->cur_altsetting;
1773 : : hdev = interface_to_usbdev(intf);
1774 : :
1775 : : /*
1776 : : * Set default autosuspend delay as 0 to speedup bus suspend,
1777 : : * based on the below considerations:
1778 : : *
1779 : : * - Unlike other drivers, the hub driver does not rely on the
1780 : : * autosuspend delay to provide enough time to handle a wakeup
1781 : : * event, and the submitted status URB is just to check future
1782 : : * change on hub downstream ports, so it is safe to do it.
1783 : : *
1784 : : * - The patch might cause one or more auto supend/resume for
1785 : : * below very rare devices when they are plugged into hub
1786 : : * first time:
1787 : : *
1788 : : * devices having trouble initializing, and disconnect
1789 : : * themselves from the bus and then reconnect a second
1790 : : * or so later
1791 : : *
1792 : : * devices just for downloading firmware, and disconnects
1793 : : * themselves after completing it
1794 : : *
1795 : : * For these quite rare devices, their drivers may change the
1796 : : * autosuspend delay of their parent hub in the probe() to one
1797 : : * appropriate value to avoid the subtle problem if someone
1798 : : * does care it.
1799 : : *
1800 : : * - The patch may cause one or more auto suspend/resume on
1801 : : * hub during running 'lsusb', but it is probably too
1802 : : * infrequent to worry about.
1803 : : *
1804 : : * - Change autosuspend delay of hub can avoid unnecessary auto
1805 : : * suspend timer for hub, also may decrease power consumption
1806 : : * of USB bus.
1807 : : *
1808 : : * - If user has indicated to prevent autosuspend by passing
1809 : : * usbcore.autosuspend = -1 then keep autosuspend disabled.
1810 : : */
1811 : : #ifdef CONFIG_PM
1812 [ + - ]: 414 : if (hdev->dev.power.autosuspend_delay >= 0)
1813 : 414 : pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
1814 : : #endif
1815 : :
1816 : : /*
1817 : : * Hubs have proper suspend/resume support, except for root hubs
1818 : : * where the controller driver doesn't have bus_suspend and
1819 : : * bus_resume methods.
1820 : : */
1821 [ + + ]: 414 : if (hdev->parent) { /* normal device */
1822 : 207 : usb_enable_autosuspend(hdev);
1823 : : } else { /* root hub */
1824 : 207 : const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver;
1825 : :
1826 [ - + # # ]: 207 : if (drv->bus_suspend && drv->bus_resume)
1827 : 0 : usb_enable_autosuspend(hdev);
1828 : : }
1829 : :
1830 [ - + ]: 414 : if (hdev->level == MAX_TOPO_LEVEL) {
1831 : 0 : dev_err(&intf->dev,
1832 : : "Unsupported bus topology: hub nested too deep\n");
1833 : 0 : return -E2BIG;
1834 : : }
1835 : :
1836 : : #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1837 : : if (hdev->parent) {
1838 : : dev_warn(&intf->dev, "ignoring external hub\n");
1839 : : return -ENODEV;
1840 : : }
1841 : : #endif
1842 : :
1843 [ - + ]: 414 : if (!hub_descriptor_is_sane(desc)) {
1844 : 0 : dev_err(&intf->dev, "bad descriptor, ignoring hub\n");
1845 : 0 : return -EIO;
1846 : : }
1847 : :
1848 : : /* We found a hub */
1849 : 414 : dev_info(&intf->dev, "USB hub found\n");
1850 : :
1851 : 414 : hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1852 [ + - ]: 414 : if (!hub)
1853 : : return -ENOMEM;
1854 : :
1855 : : kref_init(&hub->kref);
1856 : 414 : hub->intfdev = &intf->dev;
1857 : 414 : hub->hdev = hdev;
1858 : 828 : INIT_DELAYED_WORK(&hub->leds, led_work);
1859 : 828 : INIT_DELAYED_WORK(&hub->init_work, NULL);
1860 : 828 : INIT_WORK(&hub->events, hub_event);
1861 : 414 : spin_lock_init(&hub->irq_urb_lock);
1862 : 414 : timer_setup(&hub->irq_urb_retry, hub_retry_irq_urb, 0);
1863 : 414 : usb_get_intf(intf);
1864 : 414 : usb_get_dev(hdev);
1865 : :
1866 : : usb_set_intfdata(intf, hub);
1867 : 414 : intf->needs_remote_wakeup = 1;
1868 : : pm_suspend_ignore_children(&intf->dev, true);
1869 : :
1870 [ + - ]: 414 : if (hdev->speed == USB_SPEED_HIGH)
1871 : 414 : highspeed_hubs++;
1872 : :
1873 [ - + ]: 414 : if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND)
1874 : 0 : hub->quirk_check_port_auto_suspend = 1;
1875 : :
1876 [ - + ]: 414 : if (id->driver_info & HUB_QUIRK_DISABLE_AUTOSUSPEND) {
1877 : 0 : hub->quirk_disable_autosuspend = 1;
1878 : 0 : usb_autopm_get_interface_no_resume(intf);
1879 : : }
1880 : :
1881 [ - + ]: 414 : if (hub_configure(hub, &desc->endpoint[0].desc) >= 0)
1882 : : return 0;
1883 : :
1884 : 0 : hub_disconnect(intf);
1885 : 0 : return -ENODEV;
1886 : : }
1887 : :
1888 : : static int
1889 : 0 : hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1890 : : {
1891 : : struct usb_device *hdev = interface_to_usbdev(intf);
1892 : : struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
1893 : :
1894 : : /* assert ifno == 0 (part of hub spec) */
1895 [ # # ]: 0 : switch (code) {
1896 : : case USBDEVFS_HUB_PORTINFO: {
1897 : : struct usbdevfs_hub_portinfo *info = user_data;
1898 : : int i;
1899 : :
1900 : : spin_lock_irq(&device_state_lock);
1901 [ # # ]: 0 : if (hdev->devnum <= 0)
1902 : 0 : info->nports = 0;
1903 : : else {
1904 : 0 : info->nports = hdev->maxchild;
1905 [ # # ]: 0 : for (i = 0; i < info->nports; i++) {
1906 [ # # ]: 0 : if (hub->ports[i]->child == NULL)
1907 : 0 : info->port[i] = 0;
1908 : : else
1909 : 0 : info->port[i] =
1910 : 0 : hub->ports[i]->child->devnum;
1911 : : }
1912 : : }
1913 : : spin_unlock_irq(&device_state_lock);
1914 : :
1915 : 0 : return info->nports + 1;
1916 : : }
1917 : :
1918 : : default:
1919 : : return -ENOSYS;
1920 : : }
1921 : : }
1922 : :
1923 : : /*
1924 : : * Allow user programs to claim ports on a hub. When a device is attached
1925 : : * to one of these "claimed" ports, the program will "own" the device.
1926 : : */
1927 : 0 : static int find_port_owner(struct usb_device *hdev, unsigned port1,
1928 : : struct usb_dev_state ***ppowner)
1929 : : {
1930 : : struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
1931 : :
1932 [ # # ]: 0 : if (hdev->state == USB_STATE_NOTATTACHED)
1933 : : return -ENODEV;
1934 [ # # # # ]: 0 : if (port1 == 0 || port1 > hdev->maxchild)
1935 : : return -EINVAL;
1936 : :
1937 : : /* Devices not managed by the hub driver
1938 : : * will always have maxchild equal to 0.
1939 : : */
1940 : 0 : *ppowner = &(hub->ports[port1 - 1]->port_owner);
1941 : 0 : return 0;
1942 : : }
1943 : :
1944 : : /* In the following three functions, the caller must hold hdev's lock */
1945 : 0 : int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
1946 : : struct usb_dev_state *owner)
1947 : : {
1948 : : int rc;
1949 : : struct usb_dev_state **powner;
1950 : :
1951 : 0 : rc = find_port_owner(hdev, port1, &powner);
1952 [ # # ]: 0 : if (rc)
1953 : : return rc;
1954 [ # # ]: 0 : if (*powner)
1955 : : return -EBUSY;
1956 : 0 : *powner = owner;
1957 : 0 : return rc;
1958 : : }
1959 : : EXPORT_SYMBOL_GPL(usb_hub_claim_port);
1960 : :
1961 : 0 : int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
1962 : : struct usb_dev_state *owner)
1963 : : {
1964 : : int rc;
1965 : : struct usb_dev_state **powner;
1966 : :
1967 : 0 : rc = find_port_owner(hdev, port1, &powner);
1968 [ # # ]: 0 : if (rc)
1969 : : return rc;
1970 [ # # ]: 0 : if (*powner != owner)
1971 : : return -ENOENT;
1972 : 0 : *powner = NULL;
1973 : 0 : return rc;
1974 : : }
1975 : : EXPORT_SYMBOL_GPL(usb_hub_release_port);
1976 : :
1977 : 207 : void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner)
1978 : : {
1979 : : struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
1980 : : int n;
1981 : :
1982 [ - + ]: 207 : for (n = 0; n < hdev->maxchild; n++) {
1983 [ # # ]: 0 : if (hub->ports[n]->port_owner == owner)
1984 : 0 : hub->ports[n]->port_owner = NULL;
1985 : : }
1986 : :
1987 : 207 : }
1988 : :
1989 : : /* The caller must hold udev's lock */
1990 : 2277 : bool usb_device_is_owned(struct usb_device *udev)
1991 : : {
1992 : : struct usb_hub *hub;
1993 : :
1994 [ + - + + ]: 2277 : if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
1995 : : return false;
1996 : : hub = usb_hub_to_struct_hub(udev->parent);
1997 : 1863 : return !!hub->ports[udev->portnum - 1]->port_owner;
1998 : : }
1999 : :
2000 : 0 : static void recursively_mark_NOTATTACHED(struct usb_device *udev)
2001 : : {
2002 : : struct usb_hub *hub = usb_hub_to_struct_hub(udev);
2003 : : int i;
2004 : :
2005 [ # # ]: 0 : for (i = 0; i < udev->maxchild; ++i) {
2006 [ # # ]: 0 : if (hub->ports[i]->child)
2007 : 0 : recursively_mark_NOTATTACHED(hub->ports[i]->child);
2008 : : }
2009 [ # # ]: 0 : if (udev->state == USB_STATE_SUSPENDED)
2010 : 0 : udev->active_duration -= jiffies;
2011 : 0 : udev->state = USB_STATE_NOTATTACHED;
2012 : 0 : }
2013 : :
2014 : : /**
2015 : : * usb_set_device_state - change a device's current state (usbcore, hcds)
2016 : : * @udev: pointer to device whose state should be changed
2017 : : * @new_state: new state value to be stored
2018 : : *
2019 : : * udev->state is _not_ fully protected by the device lock. Although
2020 : : * most transitions are made only while holding the lock, the state can
2021 : : * can change to USB_STATE_NOTATTACHED at almost any time. This
2022 : : * is so that devices can be marked as disconnected as soon as possible,
2023 : : * without having to wait for any semaphores to be released. As a result,
2024 : : * all changes to any device's state must be protected by the
2025 : : * device_state_lock spinlock.
2026 : : *
2027 : : * Once a device has been added to the device tree, all changes to its state
2028 : : * should be made using this routine. The state should _not_ be set directly.
2029 : : *
2030 : : * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
2031 : : * Otherwise udev->state is set to new_state, and if new_state is
2032 : : * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
2033 : : * to USB_STATE_NOTATTACHED.
2034 : : */
2035 : 4554 : void usb_set_device_state(struct usb_device *udev,
2036 : : enum usb_device_state new_state)
2037 : : {
2038 : : unsigned long flags;
2039 : : int wakeup = -1;
2040 : :
2041 : 4554 : spin_lock_irqsave(&device_state_lock, flags);
2042 [ + - ]: 4554 : if (udev->state == USB_STATE_NOTATTACHED)
2043 : : ; /* do nothing */
2044 [ + - ]: 4554 : else if (new_state != USB_STATE_NOTATTACHED) {
2045 : :
2046 : : /* root hub wakeup capabilities are managed out-of-band
2047 : : * and may involve silicon errata ... ignore them here.
2048 : : */
2049 [ + + ]: 4554 : if (udev->parent) {
2050 [ + - ]: 4140 : if (udev->state == USB_STATE_SUSPENDED
2051 [ + - ]: 4140 : || new_state == USB_STATE_SUSPENDED)
2052 : : ; /* No change to wakeup settings */
2053 [ + + ]: 4140 : else if (new_state == USB_STATE_CONFIGURED)
2054 : 828 : wakeup = (udev->quirks &
2055 [ + - ]: 1656 : USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 :
2056 : 828 : udev->actconfig->desc.bmAttributes &
2057 : : USB_CONFIG_ATT_WAKEUP;
2058 : : else
2059 : : wakeup = 0;
2060 : : }
2061 [ - + # # ]: 4554 : if (udev->state == USB_STATE_SUSPENDED &&
2062 : : new_state != USB_STATE_SUSPENDED)
2063 : 0 : udev->active_duration -= jiffies;
2064 [ - + # # ]: 4554 : else if (new_state == USB_STATE_SUSPENDED &&
2065 : : udev->state != USB_STATE_SUSPENDED)
2066 : 0 : udev->active_duration += jiffies;
2067 : 4554 : udev->state = new_state;
2068 : : } else
2069 : 0 : recursively_mark_NOTATTACHED(udev);
2070 : : spin_unlock_irqrestore(&device_state_lock, flags);
2071 [ + + ]: 4554 : if (wakeup >= 0)
2072 : 4140 : device_set_wakeup_capable(&udev->dev, wakeup);
2073 : 4554 : }
2074 : : EXPORT_SYMBOL_GPL(usb_set_device_state);
2075 : :
2076 : : /*
2077 : : * Choose a device number.
2078 : : *
2079 : : * Device numbers are used as filenames in usbfs. On USB-1.1 and
2080 : : * USB-2.0 buses they are also used as device addresses, however on
2081 : : * USB-3.0 buses the address is assigned by the controller hardware
2082 : : * and it usually is not the same as the device number.
2083 : : *
2084 : : * WUSB devices are simple: they have no hubs behind, so the mapping
2085 : : * device <-> virtual port number becomes 1:1. Why? to simplify the
2086 : : * life of the device connection logic in
2087 : : * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
2088 : : * handshake we need to assign a temporary address in the unauthorized
2089 : : * space. For simplicity we use the first virtual port number found to
2090 : : * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
2091 : : * and that becomes it's address [X < 128] or its unauthorized address
2092 : : * [X | 0x80].
2093 : : *
2094 : : * We add 1 as an offset to the one-based USB-stack port number
2095 : : * (zero-based wusb virtual port index) for two reasons: (a) dev addr
2096 : : * 0 is reserved by USB for default address; (b) Linux's USB stack
2097 : : * uses always #1 for the root hub of the controller. So USB stack's
2098 : : * port #1, which is wusb virtual-port #0 has address #2.
2099 : : *
2100 : : * Devices connected under xHCI are not as simple. The host controller
2101 : : * supports virtualization, so the hardware assigns device addresses and
2102 : : * the HCD must setup data structures before issuing a set address
2103 : : * command to the hardware.
2104 : : */
2105 : 828 : static void choose_devnum(struct usb_device *udev)
2106 : : {
2107 : : int devnum;
2108 : 828 : struct usb_bus *bus = udev->bus;
2109 : :
2110 : : /* be safe when more hub events are proceed in parallel */
2111 : 828 : mutex_lock(&bus->devnum_next_mutex);
2112 [ - + ]: 828 : if (udev->wusb) {
2113 : 0 : devnum = udev->portnum + 1;
2114 [ # # ]: 0 : BUG_ON(test_bit(devnum, bus->devmap.devicemap));
2115 : : } else {
2116 : : /* Try to allocate the next devnum beginning at
2117 : : * bus->devnum_next. */
2118 : 828 : devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
2119 : : bus->devnum_next);
2120 [ - + ]: 828 : if (devnum >= 128)
2121 : 0 : devnum = find_next_zero_bit(bus->devmap.devicemap,
2122 : : 128, 1);
2123 [ + - ]: 828 : bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1);
2124 : : }
2125 [ + - ]: 828 : if (devnum < 128) {
2126 : 828 : set_bit(devnum, bus->devmap.devicemap);
2127 : 828 : udev->devnum = devnum;
2128 : : }
2129 : 828 : mutex_unlock(&bus->devnum_next_mutex);
2130 : 828 : }
2131 : :
2132 : : static void release_devnum(struct usb_device *udev)
2133 : : {
2134 [ # # # # ]: 0 : if (udev->devnum > 0) {
2135 : 0 : clear_bit(udev->devnum, udev->bus->devmap.devicemap);
2136 : 0 : udev->devnum = -1;
2137 : : }
2138 : : }
2139 : :
2140 : : static void update_devnum(struct usb_device *udev, int devnum)
2141 : : {
2142 : : /* The address for a WUSB device is managed by wusbcore. */
2143 [ # # + - : 2484 : if (!udev->wusb)
+ - ]
2144 : 2484 : udev->devnum = devnum;
2145 [ # # + - : 2484 : if (!udev->devaddr)
+ - ]
2146 : 2484 : udev->devaddr = (u8)devnum;
2147 : : }
2148 : :
2149 : : static void hub_free_dev(struct usb_device *udev)
2150 : : {
2151 : 0 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2152 : :
2153 : : /* Root hubs aren't real devices, so don't free HCD resources */
2154 [ # # # # : 0 : if (hcd->driver->free_dev && udev->parent)
# # # # ]
2155 : 0 : hcd->driver->free_dev(hcd, udev);
2156 : : }
2157 : :
2158 : 0 : static void hub_disconnect_children(struct usb_device *udev)
2159 : : {
2160 : : struct usb_hub *hub = usb_hub_to_struct_hub(udev);
2161 : : int i;
2162 : :
2163 : : /* Free up all the children before we remove this device */
2164 [ # # ]: 0 : for (i = 0; i < udev->maxchild; i++) {
2165 [ # # ]: 0 : if (hub->ports[i]->child)
2166 : 0 : usb_disconnect(&hub->ports[i]->child);
2167 : : }
2168 : 0 : }
2169 : :
2170 : : /**
2171 : : * usb_disconnect - disconnect a device (usbcore-internal)
2172 : : * @pdev: pointer to device being disconnected
2173 : : * Context: !in_interrupt ()
2174 : : *
2175 : : * Something got disconnected. Get rid of it and all of its children.
2176 : : *
2177 : : * If *pdev is a normal device then the parent hub must already be locked.
2178 : : * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock,
2179 : : * which protects the set of root hubs as well as the list of buses.
2180 : : *
2181 : : * Only hub drivers (including virtual root hub drivers for host
2182 : : * controllers) should ever call this.
2183 : : *
2184 : : * This call is synchronous, and may not be used in an interrupt context.
2185 : : */
2186 : 0 : void usb_disconnect(struct usb_device **pdev)
2187 : : {
2188 : : struct usb_port *port_dev = NULL;
2189 : 0 : struct usb_device *udev = *pdev;
2190 : : struct usb_hub *hub = NULL;
2191 : : int port1 = 1;
2192 : :
2193 : : /* mark the device as inactive, so any further urb submissions for
2194 : : * this device (and any of its children) will fail immediately.
2195 : : * this quiesces everything except pending urbs.
2196 : : */
2197 : 0 : usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2198 : 0 : dev_info(&udev->dev, "USB disconnect, device number %d\n",
2199 : : udev->devnum);
2200 : :
2201 : : /*
2202 : : * Ensure that the pm runtime code knows that the USB device
2203 : : * is in the process of being disconnected.
2204 : : */
2205 : 0 : pm_runtime_barrier(&udev->dev);
2206 : :
2207 : : usb_lock_device(udev);
2208 : :
2209 : 0 : hub_disconnect_children(udev);
2210 : :
2211 : : /* deallocate hcd/hardware state ... nuking all pending urbs and
2212 : : * cleaning up all state associated with the current configuration
2213 : : * so that the hardware is now fully quiesced.
2214 : : */
2215 : : dev_dbg(&udev->dev, "unregistering device\n");
2216 : 0 : usb_disable_device(udev, 0);
2217 : 0 : usb_hcd_synchronize_unlinks(udev);
2218 : :
2219 [ # # ]: 0 : if (udev->parent) {
2220 : 0 : port1 = udev->portnum;
2221 : : hub = usb_hub_to_struct_hub(udev->parent);
2222 : 0 : port_dev = hub->ports[port1 - 1];
2223 : :
2224 : 0 : sysfs_remove_link(&udev->dev.kobj, "port");
2225 : 0 : sysfs_remove_link(&port_dev->dev.kobj, "device");
2226 : :
2227 : : /*
2228 : : * As usb_port_runtime_resume() de-references udev, make
2229 : : * sure no resumes occur during removal
2230 : : */
2231 [ # # ]: 0 : if (!test_and_set_bit(port1, hub->child_usage_bits))
2232 : 0 : pm_runtime_get_sync(&port_dev->dev);
2233 : : }
2234 : :
2235 : 0 : usb_remove_ep_devs(&udev->ep0);
2236 : : usb_unlock_device(udev);
2237 : :
2238 : : /* Unregister the device. The device driver is responsible
2239 : : * for de-configuring the device and invoking the remove-device
2240 : : * notifier chain (used by usbfs and possibly others).
2241 : : */
2242 : 0 : device_del(&udev->dev);
2243 : :
2244 : : /* Free the device number and delete the parent's children[]
2245 : : * (or root_hub) pointer.
2246 : : */
2247 : : release_devnum(udev);
2248 : :
2249 : : /* Avoid races with recursively_mark_NOTATTACHED() */
2250 : : spin_lock_irq(&device_state_lock);
2251 : 0 : *pdev = NULL;
2252 : : spin_unlock_irq(&device_state_lock);
2253 : :
2254 [ # # # # ]: 0 : if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits))
2255 : 0 : pm_runtime_put(&port_dev->dev);
2256 : :
2257 : : hub_free_dev(udev);
2258 : :
2259 : 0 : put_device(&udev->dev);
2260 : 0 : }
2261 : :
2262 : : #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
2263 : : static void show_string(struct usb_device *udev, char *id, char *string)
2264 : : {
2265 [ + + + + : 3105 : if (!string)
+ + ]
2266 : : return;
2267 : 1449 : dev_info(&udev->dev, "%s: %s\n", id, string);
2268 : : }
2269 : :
2270 : 1035 : static void announce_device(struct usb_device *udev)
2271 : : {
2272 : 1035 : u16 bcdDevice = le16_to_cpu(udev->descriptor.bcdDevice);
2273 : :
2274 : 1035 : dev_info(&udev->dev,
2275 : : "New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%2x.%02x\n",
2276 : : le16_to_cpu(udev->descriptor.idVendor),
2277 : : le16_to_cpu(udev->descriptor.idProduct),
2278 : : bcdDevice >> 8, bcdDevice & 0xff);
2279 : 1035 : dev_info(&udev->dev,
2280 : : "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
2281 : : udev->descriptor.iManufacturer,
2282 : : udev->descriptor.iProduct,
2283 : : udev->descriptor.iSerialNumber);
2284 : 1035 : show_string(udev, "Product", udev->product);
2285 : 1035 : show_string(udev, "Manufacturer", udev->manufacturer);
2286 : 1035 : show_string(udev, "SerialNumber", udev->serial);
2287 : 1035 : }
2288 : : #else
2289 : : static inline void announce_device(struct usb_device *udev) { }
2290 : : #endif
2291 : :
2292 : :
2293 : : /**
2294 : : * usb_enumerate_device_otg - FIXME (usbcore-internal)
2295 : : * @udev: newly addressed device (in ADDRESS state)
2296 : : *
2297 : : * Finish enumeration for On-The-Go devices
2298 : : *
2299 : : * Return: 0 if successful. A negative error code otherwise.
2300 : : */
2301 : : static int usb_enumerate_device_otg(struct usb_device *udev)
2302 : : {
2303 : : int err = 0;
2304 : :
2305 : : #ifdef CONFIG_USB_OTG
2306 : : /*
2307 : : * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
2308 : : * to wake us after we've powered off VBUS; and HNP, switching roles
2309 : : * "host" to "peripheral". The OTG descriptor helps figure this out.
2310 : : */
2311 : : if (!udev->bus->is_b_host
2312 : : && udev->config
2313 : : && udev->parent == udev->bus->root_hub) {
2314 : : struct usb_otg_descriptor *desc = NULL;
2315 : : struct usb_bus *bus = udev->bus;
2316 : : unsigned port1 = udev->portnum;
2317 : :
2318 : : /* descriptor may appear anywhere in config */
2319 : : err = __usb_get_extra_descriptor(udev->rawdescriptors[0],
2320 : : le16_to_cpu(udev->config[0].desc.wTotalLength),
2321 : : USB_DT_OTG, (void **) &desc, sizeof(*desc));
2322 : : if (err || !(desc->bmAttributes & USB_OTG_HNP))
2323 : : return 0;
2324 : :
2325 : : dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n",
2326 : : (port1 == bus->otg_port) ? "" : "non-");
2327 : :
2328 : : /* enable HNP before suspend, it's simpler */
2329 : : if (port1 == bus->otg_port) {
2330 : : bus->b_hnp_enable = 1;
2331 : : err = usb_control_msg(udev,
2332 : : usb_sndctrlpipe(udev, 0),
2333 : : USB_REQ_SET_FEATURE, 0,
2334 : : USB_DEVICE_B_HNP_ENABLE,
2335 : : 0, NULL, 0,
2336 : : USB_CTRL_SET_TIMEOUT);
2337 : : if (err < 0) {
2338 : : /*
2339 : : * OTG MESSAGE: report errors here,
2340 : : * customize to match your product.
2341 : : */
2342 : : dev_err(&udev->dev, "can't set HNP mode: %d\n",
2343 : : err);
2344 : : bus->b_hnp_enable = 0;
2345 : : }
2346 : : } else if (desc->bLength == sizeof
2347 : : (struct usb_otg_descriptor)) {
2348 : : /* Set a_alt_hnp_support for legacy otg device */
2349 : : err = usb_control_msg(udev,
2350 : : usb_sndctrlpipe(udev, 0),
2351 : : USB_REQ_SET_FEATURE, 0,
2352 : : USB_DEVICE_A_ALT_HNP_SUPPORT,
2353 : : 0, NULL, 0,
2354 : : USB_CTRL_SET_TIMEOUT);
2355 : : if (err < 0)
2356 : : dev_err(&udev->dev,
2357 : : "set a_alt_hnp_support failed: %d\n",
2358 : : err);
2359 : : }
2360 : : }
2361 : : #endif
2362 : : return err;
2363 : : }
2364 : :
2365 : :
2366 : : /**
2367 : : * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
2368 : : * @udev: newly addressed device (in ADDRESS state)
2369 : : *
2370 : : * This is only called by usb_new_device() and usb_authorize_device()
2371 : : * and FIXME -- all comments that apply to them apply here wrt to
2372 : : * environment.
2373 : : *
2374 : : * If the device is WUSB and not authorized, we don't attempt to read
2375 : : * the string descriptors, as they will be errored out by the device
2376 : : * until it has been authorized.
2377 : : *
2378 : : * Return: 0 if successful. A negative error code otherwise.
2379 : : */
2380 : 1035 : static int usb_enumerate_device(struct usb_device *udev)
2381 : : {
2382 : : int err;
2383 : : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2384 : :
2385 [ + - ]: 1035 : if (udev->config == NULL) {
2386 : 1035 : err = usb_get_configuration(udev);
2387 [ - + ]: 1035 : if (err < 0) {
2388 [ # # ]: 0 : if (err != -ENODEV)
2389 : 0 : dev_err(&udev->dev, "can't read configurations, error %d\n",
2390 : : err);
2391 : 0 : return err;
2392 : : }
2393 : : }
2394 : :
2395 : : /* read the standard strings and cache them if present */
2396 : 1035 : udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
2397 : 1035 : udev->manufacturer = usb_cache_string(udev,
2398 : 1035 : udev->descriptor.iManufacturer);
2399 : 1035 : udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
2400 : :
2401 : : err = usb_enumerate_device_otg(udev);
2402 : : if (err < 0)
2403 : : return err;
2404 : :
2405 : : if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support &&
2406 : : !is_targeted(udev)) {
2407 : : /* Maybe it can talk to us, though we can't talk to it.
2408 : : * (Includes HNP test device.)
2409 : : */
2410 : : if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable
2411 : : || udev->bus->is_b_host)) {
2412 : : err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND);
2413 : : if (err < 0)
2414 : : dev_dbg(&udev->dev, "HNP fail, %d\n", err);
2415 : : }
2416 : : return -ENOTSUPP;
2417 : : }
2418 : :
2419 : 1035 : usb_detect_interface_quirks(udev);
2420 : :
2421 : 1035 : return 0;
2422 : : }
2423 : :
2424 : 828 : static void set_usb_port_removable(struct usb_device *udev)
2425 : : {
2426 : 828 : struct usb_device *hdev = udev->parent;
2427 : : struct usb_hub *hub;
2428 : 828 : u8 port = udev->portnum;
2429 : : u16 wHubCharacteristics;
2430 : : bool removable = true;
2431 : :
2432 [ + - ]: 828 : if (!hdev)
2433 : : return;
2434 : :
2435 : : hub = usb_hub_to_struct_hub(udev->parent);
2436 : :
2437 : : /*
2438 : : * If the platform firmware has provided information about a port,
2439 : : * use that to determine whether it's removable.
2440 : : */
2441 [ - - + ]: 828 : switch (hub->ports[udev->portnum - 1]->connect_type) {
2442 : : case USB_PORT_CONNECT_TYPE_HOT_PLUG:
2443 : 0 : udev->removable = USB_DEVICE_REMOVABLE;
2444 : 0 : return;
2445 : : case USB_PORT_CONNECT_TYPE_HARD_WIRED:
2446 : : case USB_PORT_NOT_USED:
2447 : 0 : udev->removable = USB_DEVICE_FIXED;
2448 : 0 : return;
2449 : : default:
2450 : : break;
2451 : : }
2452 : :
2453 : : /*
2454 : : * Otherwise, check whether the hub knows whether a port is removable
2455 : : * or not
2456 : : */
2457 : 828 : wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2458 : :
2459 [ + + ]: 828 : if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
2460 : : return;
2461 : :
2462 [ - + ]: 621 : if (hub_is_superspeed(hdev)) {
2463 [ # # ]: 0 : if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable)
2464 : : & (1 << port))
2465 : : removable = false;
2466 : : } else {
2467 [ + + ]: 621 : if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
2468 : : removable = false;
2469 : : }
2470 : :
2471 [ + + ]: 621 : if (removable)
2472 : 414 : udev->removable = USB_DEVICE_REMOVABLE;
2473 : : else
2474 : 207 : udev->removable = USB_DEVICE_FIXED;
2475 : :
2476 : : }
2477 : :
2478 : : /**
2479 : : * usb_new_device - perform initial device setup (usbcore-internal)
2480 : : * @udev: newly addressed device (in ADDRESS state)
2481 : : *
2482 : : * This is called with devices which have been detected but not fully
2483 : : * enumerated. The device descriptor is available, but not descriptors
2484 : : * for any device configuration. The caller must have locked either
2485 : : * the parent hub (if udev is a normal device) or else the
2486 : : * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to
2487 : : * udev has already been installed, but udev is not yet visible through
2488 : : * sysfs or other filesystem code.
2489 : : *
2490 : : * This call is synchronous, and may not be used in an interrupt context.
2491 : : *
2492 : : * Only the hub driver or root-hub registrar should ever call this.
2493 : : *
2494 : : * Return: Whether the device is configured properly or not. Zero if the
2495 : : * interface was registered with the driver core; else a negative errno
2496 : : * value.
2497 : : *
2498 : : */
2499 : 1035 : int usb_new_device(struct usb_device *udev)
2500 : : {
2501 : : int err;
2502 : :
2503 [ + + ]: 1035 : if (udev->parent) {
2504 : : /* Initialize non-root-hub device wakeup to disabled;
2505 : : * device (un)configuration controls wakeup capable
2506 : : * sysfs power/wakeup controls wakeup enabled/disabled
2507 : : */
2508 : : device_init_wakeup(&udev->dev, 0);
2509 : : }
2510 : :
2511 : : /* Tell the runtime-PM framework the device is active */
2512 : 1035 : pm_runtime_set_active(&udev->dev);
2513 : : pm_runtime_get_noresume(&udev->dev);
2514 : : pm_runtime_use_autosuspend(&udev->dev);
2515 : 1035 : pm_runtime_enable(&udev->dev);
2516 : :
2517 : : /* By default, forbid autosuspend for all devices. It will be
2518 : : * allowed for hubs during binding.
2519 : : */
2520 : 1035 : usb_disable_autosuspend(udev);
2521 : :
2522 : 1035 : err = usb_enumerate_device(udev); /* Read descriptors */
2523 [ + - ]: 1035 : if (err < 0)
2524 : : goto fail;
2525 : : dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
2526 : : udev->devnum, udev->bus->busnum,
2527 : : (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
2528 : : /* export the usbdev device-node for libusb */
2529 : 1035 : udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
2530 : : (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
2531 : :
2532 : : /* Tell the world! */
2533 : 1035 : announce_device(udev);
2534 : :
2535 [ + + ]: 1035 : if (udev->serial)
2536 : 207 : add_device_randomness(udev->serial, strlen(udev->serial));
2537 [ + + ]: 1035 : if (udev->product)
2538 : 621 : add_device_randomness(udev->product, strlen(udev->product));
2539 [ + + ]: 1035 : if (udev->manufacturer)
2540 : 621 : add_device_randomness(udev->manufacturer,
2541 : : strlen(udev->manufacturer));
2542 : :
2543 : : device_enable_async_suspend(&udev->dev);
2544 : :
2545 : : /* check whether the hub or firmware marks this port as non-removable */
2546 [ + + ]: 1035 : if (udev->parent)
2547 : 828 : set_usb_port_removable(udev);
2548 : :
2549 : : /* Register the device. The device driver is responsible
2550 : : * for configuring the device and invoking the add-device
2551 : : * notifier chain (used by usbfs and possibly others).
2552 : : */
2553 : 1035 : err = device_add(&udev->dev);
2554 [ - + ]: 1035 : if (err) {
2555 : 0 : dev_err(&udev->dev, "can't device_add, error %d\n", err);
2556 : 0 : goto fail;
2557 : : }
2558 : :
2559 : : /* Create link files between child device and usb port device. */
2560 [ + + ]: 1035 : if (udev->parent) {
2561 : : struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
2562 : 828 : int port1 = udev->portnum;
2563 : 828 : struct usb_port *port_dev = hub->ports[port1 - 1];
2564 : :
2565 : 828 : err = sysfs_create_link(&udev->dev.kobj,
2566 : : &port_dev->dev.kobj, "port");
2567 [ + - ]: 828 : if (err)
2568 : : goto fail;
2569 : :
2570 : 828 : err = sysfs_create_link(&port_dev->dev.kobj,
2571 : : &udev->dev.kobj, "device");
2572 [ - + ]: 828 : if (err) {
2573 : 0 : sysfs_remove_link(&udev->dev.kobj, "port");
2574 : 0 : goto fail;
2575 : : }
2576 : :
2577 [ + - ]: 828 : if (!test_and_set_bit(port1, hub->child_usage_bits))
2578 : 828 : pm_runtime_get_sync(&port_dev->dev);
2579 : : }
2580 : :
2581 : 1035 : (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
2582 : : usb_mark_last_busy(udev);
2583 : : pm_runtime_put_sync_autosuspend(&udev->dev);
2584 : 1035 : return err;
2585 : :
2586 : : fail:
2587 : 0 : usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2588 : : pm_runtime_disable(&udev->dev);
2589 : : pm_runtime_set_suspended(&udev->dev);
2590 : 0 : return err;
2591 : : }
2592 : :
2593 : :
2594 : : /**
2595 : : * usb_deauthorize_device - deauthorize a device (usbcore-internal)
2596 : : * @usb_dev: USB device
2597 : : *
2598 : : * Move the USB device to a very basic state where interfaces are disabled
2599 : : * and the device is in fact unconfigured and unusable.
2600 : : *
2601 : : * We share a lock (that we have) with device_del(), so we need to
2602 : : * defer its call.
2603 : : *
2604 : : * Return: 0.
2605 : : */
2606 : 0 : int usb_deauthorize_device(struct usb_device *usb_dev)
2607 : : {
2608 : : usb_lock_device(usb_dev);
2609 [ # # ]: 0 : if (usb_dev->authorized == 0)
2610 : : goto out_unauthorized;
2611 : :
2612 : 0 : usb_dev->authorized = 0;
2613 : 0 : usb_set_configuration(usb_dev, -1);
2614 : :
2615 : : out_unauthorized:
2616 : : usb_unlock_device(usb_dev);
2617 : 0 : return 0;
2618 : : }
2619 : :
2620 : :
2621 : 0 : int usb_authorize_device(struct usb_device *usb_dev)
2622 : : {
2623 : : int result = 0, c;
2624 : :
2625 : : usb_lock_device(usb_dev);
2626 [ # # ]: 0 : if (usb_dev->authorized == 1)
2627 : : goto out_authorized;
2628 : :
2629 : 0 : result = usb_autoresume_device(usb_dev);
2630 [ # # ]: 0 : if (result < 0) {
2631 : 0 : dev_err(&usb_dev->dev,
2632 : : "can't autoresume for authorization: %d\n", result);
2633 : 0 : goto error_autoresume;
2634 : : }
2635 : :
2636 [ # # ]: 0 : if (usb_dev->wusb) {
2637 : 0 : result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
2638 [ # # ]: 0 : if (result < 0) {
2639 : 0 : dev_err(&usb_dev->dev, "can't re-read device descriptor for "
2640 : : "authorization: %d\n", result);
2641 : 0 : goto error_device_descriptor;
2642 : : }
2643 : : }
2644 : :
2645 : 0 : usb_dev->authorized = 1;
2646 : : /* Choose and set the configuration. This registers the interfaces
2647 : : * with the driver core and lets interface drivers bind to them.
2648 : : */
2649 : 0 : c = usb_choose_configuration(usb_dev);
2650 [ # # ]: 0 : if (c >= 0) {
2651 : 0 : result = usb_set_configuration(usb_dev, c);
2652 [ # # ]: 0 : if (result) {
2653 : 0 : dev_err(&usb_dev->dev,
2654 : : "can't set config #%d, error %d\n", c, result);
2655 : : /* This need not be fatal. The user can try to
2656 : : * set other configurations. */
2657 : : }
2658 : : }
2659 : 0 : dev_info(&usb_dev->dev, "authorized to connect\n");
2660 : :
2661 : : error_device_descriptor:
2662 : 0 : usb_autosuspend_device(usb_dev);
2663 : : error_autoresume:
2664 : : out_authorized:
2665 : : usb_unlock_device(usb_dev); /* complements locktree */
2666 : 0 : return result;
2667 : : }
2668 : :
2669 : : /*
2670 : : * Return 1 if port speed is SuperSpeedPlus, 0 otherwise
2671 : : * check it from the link protocol field of the current speed ID attribute.
2672 : : * current speed ID is got from ext port status request. Sublink speed attribute
2673 : : * table is returned with the hub BOS SSP device capability descriptor
2674 : : */
2675 : : static int port_speed_is_ssp(struct usb_device *hdev, int speed_id)
2676 : : {
2677 : : int ssa_count;
2678 : : u32 ss_attr;
2679 : : int i;
2680 : 0 : struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap;
2681 : :
2682 [ # # ]: 0 : if (!ssp_cap)
2683 : : return 0;
2684 : :
2685 : 0 : ssa_count = le32_to_cpu(ssp_cap->bmAttributes) &
2686 : : USB_SSP_SUBLINK_SPEED_ATTRIBS;
2687 : :
2688 [ # # ]: 0 : for (i = 0; i <= ssa_count; i++) {
2689 : 0 : ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]);
2690 [ # # ]: 0 : if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID))
2691 : 0 : return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP);
2692 : : }
2693 : : return 0;
2694 : : }
2695 : :
2696 : : /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2697 : : static unsigned hub_is_wusb(struct usb_hub *hub)
2698 : : {
2699 : : struct usb_hcd *hcd;
2700 [ + + + + ]: 2484 : if (hub->hdev->parent != NULL) /* not a root hub? */
2701 : : return 0;
2702 : 621 : hcd = bus_to_hcd(hub->hdev->bus);
2703 : 621 : return hcd->wireless;
2704 : : }
2705 : :
2706 : :
2707 : : #define PORT_RESET_TRIES 5
2708 : : #define SET_ADDRESS_TRIES 2
2709 : : #define GET_DESCRIPTOR_TRIES 2
2710 : : #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
2711 : : #define USE_NEW_SCHEME(i, scheme) ((i) / 2 == (int)(scheme))
2712 : :
2713 : : #define HUB_ROOT_RESET_TIME 60 /* times are in msec */
2714 : : #define HUB_SHORT_RESET_TIME 10
2715 : : #define HUB_BH_RESET_TIME 50
2716 : : #define HUB_LONG_RESET_TIME 200
2717 : : #define HUB_RESET_TIMEOUT 800
2718 : :
2719 : : /*
2720 : : * "New scheme" enumeration causes an extra state transition to be
2721 : : * exposed to an xhci host and causes USB3 devices to receive control
2722 : : * commands in the default state. This has been seen to cause
2723 : : * enumeration failures, so disable this enumeration scheme for USB3
2724 : : * devices.
2725 : : */
2726 : : static bool use_new_scheme(struct usb_device *udev, int retry,
2727 : : struct usb_port *port_dev)
2728 : : {
2729 : 828 : int old_scheme_first_port =
2730 : 828 : port_dev->quirks & USB_PORT_QUIRK_OLD_SCHEME;
2731 : :
2732 [ + - ]: 828 : if (udev->speed >= USB_SPEED_SUPER)
2733 : : return false;
2734 : :
2735 [ + - + - ]: 828 : return USE_NEW_SCHEME(retry, old_scheme_first_port || old_scheme_first);
2736 : : }
2737 : :
2738 : : /* Is a USB 3.0 port in the Inactive or Compliance Mode state?
2739 : : * Port warm reset is required to recover
2740 : : */
2741 : 2703 : static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1,
2742 : : u16 portstatus)
2743 : : {
2744 : : u16 link_state;
2745 : :
2746 [ - + ]: 5406 : if (!hub_is_superspeed(hub->hdev))
2747 : : return false;
2748 : :
2749 [ # # ]: 0 : if (test_bit(port1, hub->warm_reset_bits))
2750 : : return true;
2751 : :
2752 : 0 : link_state = portstatus & USB_PORT_STAT_LINK_STATE;
2753 : 0 : return link_state == USB_SS_PORT_LS_SS_INACTIVE
2754 : 0 : || link_state == USB_SS_PORT_LS_COMP_MOD;
2755 : : }
2756 : :
2757 : 1656 : static int hub_port_wait_reset(struct usb_hub *hub, int port1,
2758 : : struct usb_device *udev, unsigned int delay, bool warm)
2759 : : {
2760 : : int delay_time, ret;
2761 : : u16 portstatus;
2762 : : u16 portchange;
2763 : 1656 : u32 ext_portstatus = 0;
2764 : :
2765 [ + - ]: 3312 : for (delay_time = 0;
2766 : : delay_time < HUB_RESET_TIMEOUT;
2767 : 0 : delay_time += delay) {
2768 : : /* wait to give the device a chance to reset */
2769 : 1656 : msleep(delay);
2770 : :
2771 : : /* read and decode port status */
2772 [ - + ]: 3312 : if (hub_is_superspeedplus(hub->hdev))
2773 : 0 : ret = hub_ext_port_status(hub, port1,
2774 : : HUB_EXT_PORT_STATUS,
2775 : : &portstatus, &portchange,
2776 : : &ext_portstatus);
2777 : : else
2778 : : ret = hub_port_status(hub, port1, &portstatus,
2779 : : &portchange);
2780 [ - + ]: 1656 : if (ret < 0)
2781 : 0 : return ret;
2782 : :
2783 : : /*
2784 : : * The port state is unknown until the reset completes.
2785 : : *
2786 : : * On top of that, some chips may require additional time
2787 : : * to re-establish a connection after the reset is complete,
2788 : : * so also wait for the connection to be re-established.
2789 : : */
2790 [ - + ]: 1656 : if (!(portstatus & USB_PORT_STAT_RESET) &&
2791 : : (portstatus & USB_PORT_STAT_CONNECTION))
2792 : : break;
2793 : :
2794 : : /* switch to the long delay after two short delay failures */
2795 [ # # ]: 0 : if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
2796 : : delay = HUB_LONG_RESET_TIME;
2797 : :
2798 : : dev_dbg(&hub->ports[port1 - 1]->dev,
2799 : : "not %sreset yet, waiting %dms\n",
2800 : : warm ? "warm " : "", delay);
2801 : : }
2802 : :
2803 [ + - ]: 1656 : if ((portstatus & USB_PORT_STAT_RESET))
2804 : : return -EBUSY;
2805 : :
2806 [ + - ]: 1656 : if (hub_port_warm_reset_required(hub, port1, portstatus))
2807 : : return -ENOTCONN;
2808 : :
2809 : : /* Device went away? */
2810 [ + - ]: 1656 : if (!(portstatus & USB_PORT_STAT_CONNECTION))
2811 : : return -ENOTCONN;
2812 : :
2813 : : /* Retry if connect change is set but status is still connected.
2814 : : * A USB 3.0 connection may bounce if multiple warm resets were issued,
2815 : : * but the device may have successfully re-connected. Ignore it.
2816 : : */
2817 [ + - - + ]: 4968 : if (!hub_is_superspeed(hub->hdev) &&
2818 : 1656 : (portchange & USB_PORT_STAT_C_CONNECTION)) {
2819 : 0 : usb_clear_port_feature(hub->hdev, port1,
2820 : : USB_PORT_FEAT_C_CONNECTION);
2821 : 0 : return -EAGAIN;
2822 : : }
2823 : :
2824 [ + - ]: 1656 : if (!(portstatus & USB_PORT_STAT_ENABLE))
2825 : : return -EBUSY;
2826 : :
2827 [ + - ]: 1656 : if (!udev)
2828 : : return 0;
2829 : :
2830 [ - + ]: 1656 : if (hub_is_superspeedplus(hub->hdev)) {
2831 : : /* extended portstatus Rx and Tx lane count are zero based */
2832 : 0 : udev->rx_lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1;
2833 : 0 : udev->tx_lanes = USB_EXT_PORT_TX_LANES(ext_portstatus) + 1;
2834 : : } else {
2835 : 1656 : udev->rx_lanes = 1;
2836 : 1656 : udev->tx_lanes = 1;
2837 : : }
2838 [ - + ]: 1656 : if (hub_is_wusb(hub))
2839 : 0 : udev->speed = USB_SPEED_WIRELESS;
2840 [ - + # # ]: 1656 : else if (hub_is_superspeedplus(hub->hdev) &&
2841 : 0 : port_speed_is_ssp(hub->hdev, ext_portstatus &
2842 : : USB_EXT_PORT_STAT_RX_SPEED_ID))
2843 : 0 : udev->speed = USB_SPEED_SUPER_PLUS;
2844 [ - + ]: 1656 : else if (hub_is_superspeed(hub->hdev))
2845 : 0 : udev->speed = USB_SPEED_SUPER;
2846 [ + + ]: 1656 : else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
2847 : 828 : udev->speed = USB_SPEED_HIGH;
2848 [ + - ]: 828 : else if (portstatus & USB_PORT_STAT_LOW_SPEED)
2849 : 828 : udev->speed = USB_SPEED_LOW;
2850 : : else
2851 : 0 : udev->speed = USB_SPEED_FULL;
2852 : : return 0;
2853 : : }
2854 : :
2855 : : /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
2856 : 1656 : static int hub_port_reset(struct usb_hub *hub, int port1,
2857 : : struct usb_device *udev, unsigned int delay, bool warm)
2858 : : {
2859 : : int i, status;
2860 : : u16 portchange, portstatus;
2861 : 1656 : struct usb_port *port_dev = hub->ports[port1 - 1];
2862 : : int reset_recovery_time;
2863 : :
2864 [ + - ]: 3312 : if (!hub_is_superspeed(hub->hdev)) {
2865 [ - + ]: 1656 : if (warm) {
2866 : 0 : dev_err(hub->intfdev, "only USB3 hub support "
2867 : : "warm reset\n");
2868 : 0 : return -EINVAL;
2869 : : }
2870 : : /* Block EHCI CF initialization during the port reset.
2871 : : * Some companion controllers don't like it when they mix.
2872 : : */
2873 : 1656 : down_read(&ehci_cf_port_reset_rwsem);
2874 [ # # ]: 0 : } else if (!warm) {
2875 : : /*
2876 : : * If the caller hasn't explicitly requested a warm reset,
2877 : : * double check and see if one is needed.
2878 : : */
2879 [ # # ]: 0 : if (hub_port_status(hub, port1, &portstatus, &portchange) == 0)
2880 [ # # ]: 0 : if (hub_port_warm_reset_required(hub, port1,
2881 : : portstatus))
2882 : : warm = true;
2883 : : }
2884 : 1656 : clear_bit(port1, hub->warm_reset_bits);
2885 : :
2886 : : /* Reset the port */
2887 [ + - ]: 1656 : for (i = 0; i < PORT_RESET_TRIES; i++) {
2888 [ + - ]: 1656 : status = set_port_feature(hub->hdev, port1, (warm ?
2889 : : USB_PORT_FEAT_BH_PORT_RESET :
2890 : : USB_PORT_FEAT_RESET));
2891 [ + - ]: 1656 : if (status == -ENODEV) {
2892 : : ; /* The hub is gone */
2893 [ - + ]: 1656 : } else if (status) {
2894 [ # # ]: 0 : dev_err(&port_dev->dev,
2895 : : "cannot %sreset (err = %d)\n",
2896 : : warm ? "warm " : "", status);
2897 : : } else {
2898 : 1656 : status = hub_port_wait_reset(hub, port1, udev, delay,
2899 : : warm);
2900 : : if (status && status != -ENOTCONN && status != -ENODEV)
2901 : : dev_dbg(hub->intfdev,
2902 : : "port_wait_reset: err = %d\n",
2903 : : status);
2904 : : }
2905 : :
2906 : : /* Check for disconnect or reset */
2907 [ - + # # ]: 1656 : if (status == 0 || status == -ENOTCONN || status == -ENODEV) {
2908 : 1656 : usb_clear_port_feature(hub->hdev, port1,
2909 : : USB_PORT_FEAT_C_RESET);
2910 : :
2911 [ - + ]: 3312 : if (!hub_is_superspeed(hub->hdev))
2912 : : goto done;
2913 : :
2914 : 0 : usb_clear_port_feature(hub->hdev, port1,
2915 : : USB_PORT_FEAT_C_BH_PORT_RESET);
2916 : 0 : usb_clear_port_feature(hub->hdev, port1,
2917 : : USB_PORT_FEAT_C_PORT_LINK_STATE);
2918 : :
2919 [ # # ]: 0 : if (udev)
2920 : 0 : usb_clear_port_feature(hub->hdev, port1,
2921 : : USB_PORT_FEAT_C_CONNECTION);
2922 : :
2923 : : /*
2924 : : * If a USB 3.0 device migrates from reset to an error
2925 : : * state, re-issue the warm reset.
2926 : : */
2927 [ # # ]: 0 : if (hub_port_status(hub, port1,
2928 : : &portstatus, &portchange) < 0)
2929 : : goto done;
2930 : :
2931 [ # # ]: 0 : if (!hub_port_warm_reset_required(hub, port1,
2932 : : portstatus))
2933 : : goto done;
2934 : :
2935 : : /*
2936 : : * If the port is in SS.Inactive or Compliance Mode, the
2937 : : * hot or warm reset failed. Try another warm reset.
2938 : : */
2939 [ # # ]: 0 : if (!warm) {
2940 : : dev_dbg(&port_dev->dev,
2941 : : "hot reset failed, warm reset\n");
2942 : : warm = true;
2943 : : }
2944 : : }
2945 : :
2946 : : dev_dbg(&port_dev->dev,
2947 : : "not enabled, trying %sreset again...\n",
2948 : : warm ? "warm " : "");
2949 : : delay = HUB_LONG_RESET_TIME;
2950 : : }
2951 : :
2952 : 0 : dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n");
2953 : :
2954 : : done:
2955 [ + - ]: 1656 : if (status == 0) {
2956 [ - + ]: 1656 : if (port_dev->quirks & USB_PORT_QUIRK_FAST_ENUM)
2957 : 0 : usleep_range(10000, 12000);
2958 : : else {
2959 : : /* TRSTRCY = 10 ms; plus some extra */
2960 : : reset_recovery_time = 10 + 40;
2961 : :
2962 : : /* Hub needs extra delay after resetting its port. */
2963 [ - + ]: 1656 : if (hub->hdev->quirks & USB_QUIRK_HUB_SLOW_RESET)
2964 : : reset_recovery_time += 100;
2965 : :
2966 : 1656 : msleep(reset_recovery_time);
2967 : : }
2968 : :
2969 [ + - ]: 1656 : if (udev) {
2970 : 1656 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2971 : :
2972 : : update_devnum(udev, 0);
2973 : : /* The xHC may think the device is already reset,
2974 : : * so ignore the status.
2975 : : */
2976 [ - + ]: 1656 : if (hcd->driver->reset_device)
2977 : 0 : hcd->driver->reset_device(hcd, udev);
2978 : :
2979 : 1656 : usb_set_device_state(udev, USB_STATE_DEFAULT);
2980 : : }
2981 : : } else {
2982 [ # # ]: 0 : if (udev)
2983 : 0 : usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2984 : : }
2985 : :
2986 [ + - ]: 3312 : if (!hub_is_superspeed(hub->hdev))
2987 : 1656 : up_read(&ehci_cf_port_reset_rwsem);
2988 : :
2989 : 1656 : return status;
2990 : : }
2991 : :
2992 : : /* Check if a port is power on */
2993 : : static int port_is_power_on(struct usb_hub *hub, unsigned portstatus)
2994 : : {
2995 : : int ret = 0;
2996 : :
2997 [ # # # # : 0 : if (hub_is_superspeed(hub->hdev)) {
# # ]
2998 [ # # # # : 0 : if (portstatus & USB_SS_PORT_STAT_POWER)
# # ]
2999 : : ret = 1;
3000 : : } else {
3001 [ # # # # : 0 : if (portstatus & USB_PORT_STAT_POWER)
# # ]
3002 : : ret = 1;
3003 : : }
3004 : :
3005 : : return ret;
3006 : : }
3007 : :
3008 : : static void usb_lock_port(struct usb_port *port_dev)
3009 : : __acquires(&port_dev->status_lock)
3010 : : {
3011 : 2703 : mutex_lock(&port_dev->status_lock);
3012 : : __acquire(&port_dev->status_lock);
3013 : : }
3014 : :
3015 : : static void usb_unlock_port(struct usb_port *port_dev)
3016 : : __releases(&port_dev->status_lock)
3017 : : {
3018 : 2703 : mutex_unlock(&port_dev->status_lock);
3019 : : __release(&port_dev->status_lock);
3020 : : }
3021 : :
3022 : : #ifdef CONFIG_PM
3023 : :
3024 : : /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
3025 : : static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
3026 : : {
3027 : : int ret = 0;
3028 : :
3029 [ # # # # ]: 0 : if (hub_is_superspeed(hub->hdev)) {
3030 [ # # # # ]: 0 : if ((portstatus & USB_PORT_STAT_LINK_STATE)
3031 : : == USB_SS_PORT_LS_U3)
3032 : : ret = 1;
3033 : : } else {
3034 [ # # # # ]: 0 : if (portstatus & USB_PORT_STAT_SUSPEND)
3035 : : ret = 1;
3036 : : }
3037 : :
3038 : : return ret;
3039 : : }
3040 : :
3041 : : /* Determine whether the device on a port is ready for a normal resume,
3042 : : * is ready for a reset-resume, or should be disconnected.
3043 : : */
3044 : 0 : static int check_port_resume_type(struct usb_device *udev,
3045 : : struct usb_hub *hub, int port1,
3046 : : int status, u16 portchange, u16 portstatus)
3047 : : {
3048 : : struct usb_port *port_dev = hub->ports[port1 - 1];
3049 : : int retries = 3;
3050 : :
3051 : : retry:
3052 : : /* Is a warm reset needed to recover the connection? */
3053 [ # # # # ]: 0 : if (status == 0 && udev->reset_resume
3054 [ # # ]: 0 : && hub_port_warm_reset_required(hub, port1, portstatus)) {
3055 : : /* pass */;
3056 : : }
3057 : : /* Is the device still present? */
3058 [ # # # # : 0 : else if (status || port_is_suspended(hub, portstatus) ||
# # ]
3059 : : !port_is_power_on(hub, portstatus)) {
3060 [ # # ]: 0 : if (status >= 0)
3061 : : status = -ENODEV;
3062 [ # # ]: 0 : } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
3063 [ # # ]: 0 : if (retries--) {
3064 : 0 : usleep_range(200, 300);
3065 : : status = hub_port_status(hub, port1, &portstatus,
3066 : : &portchange);
3067 : : goto retry;
3068 : : }
3069 : : status = -ENODEV;
3070 : : }
3071 : :
3072 : : /* Can't do a normal resume if the port isn't enabled,
3073 : : * so try a reset-resume instead.
3074 : : */
3075 [ # # # # ]: 0 : else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
3076 [ # # ]: 0 : if (udev->persist_enabled)
3077 : 0 : udev->reset_resume = 1;
3078 : : else
3079 : : status = -ENODEV;
3080 : : }
3081 : :
3082 [ # # ]: 0 : if (status) {
3083 : : dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n",
3084 : : portchange, portstatus, status);
3085 [ # # ]: 0 : } else if (udev->reset_resume) {
3086 : :
3087 : : /* Late port handoff can set status-change bits */
3088 [ # # ]: 0 : if (portchange & USB_PORT_STAT_C_CONNECTION)
3089 : 0 : usb_clear_port_feature(hub->hdev, port1,
3090 : : USB_PORT_FEAT_C_CONNECTION);
3091 [ # # ]: 0 : if (portchange & USB_PORT_STAT_C_ENABLE)
3092 : 0 : usb_clear_port_feature(hub->hdev, port1,
3093 : : USB_PORT_FEAT_C_ENABLE);
3094 : :
3095 : : /*
3096 : : * Whatever made this reset-resume necessary may have
3097 : : * turned on the port1 bit in hub->change_bits. But after
3098 : : * a successful reset-resume we want the bit to be clear;
3099 : : * if it was on it would indicate that something happened
3100 : : * following the reset-resume.
3101 : : */
3102 : 0 : clear_bit(port1, hub->change_bits);
3103 : : }
3104 : :
3105 : 0 : return status;
3106 : : }
3107 : :
3108 : 0 : int usb_disable_ltm(struct usb_device *udev)
3109 : : {
3110 : 0 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
3111 : :
3112 : : /* Check if the roothub and device supports LTM. */
3113 [ # # # # ]: 0 : if (!usb_device_supports_ltm(hcd->self.root_hub) ||
3114 : : !usb_device_supports_ltm(udev))
3115 : : return 0;
3116 : :
3117 : : /* Clear Feature LTM Enable can only be sent if the device is
3118 : : * configured.
3119 : : */
3120 [ # # ]: 0 : if (!udev->actconfig)
3121 : : return 0;
3122 : :
3123 : 0 : return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3124 : : USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
3125 : : USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
3126 : : USB_CTRL_SET_TIMEOUT);
3127 : : }
3128 : : EXPORT_SYMBOL_GPL(usb_disable_ltm);
3129 : :
3130 : 1035 : void usb_enable_ltm(struct usb_device *udev)
3131 : : {
3132 : 1035 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
3133 : :
3134 : : /* Check if the roothub and device supports LTM. */
3135 [ - + # # ]: 2070 : if (!usb_device_supports_ltm(hcd->self.root_hub) ||
3136 : : !usb_device_supports_ltm(udev))
3137 : : return;
3138 : :
3139 : : /* Set Feature LTM Enable can only be sent if the device is
3140 : : * configured.
3141 : : */
3142 [ # # ]: 0 : if (!udev->actconfig)
3143 : : return;
3144 : :
3145 : 0 : usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3146 : : USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
3147 : : USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
3148 : : USB_CTRL_SET_TIMEOUT);
3149 : : }
3150 : : EXPORT_SYMBOL_GPL(usb_enable_ltm);
3151 : :
3152 : : /*
3153 : : * usb_enable_remote_wakeup - enable remote wakeup for a device
3154 : : * @udev: target device
3155 : : *
3156 : : * For USB-2 devices: Set the device's remote wakeup feature.
3157 : : *
3158 : : * For USB-3 devices: Assume there's only one function on the device and
3159 : : * enable remote wake for the first interface. FIXME if the interface
3160 : : * association descriptor shows there's more than one function.
3161 : : */
3162 : 0 : static int usb_enable_remote_wakeup(struct usb_device *udev)
3163 : : {
3164 [ # # ]: 0 : if (udev->speed < USB_SPEED_SUPER)
3165 : 0 : return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3166 : : USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
3167 : : USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0,
3168 : : USB_CTRL_SET_TIMEOUT);
3169 : : else
3170 : 0 : return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3171 : : USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE,
3172 : : USB_INTRF_FUNC_SUSPEND,
3173 : : USB_INTRF_FUNC_SUSPEND_RW |
3174 : : USB_INTRF_FUNC_SUSPEND_LP,
3175 : : NULL, 0, USB_CTRL_SET_TIMEOUT);
3176 : : }
3177 : :
3178 : : /*
3179 : : * usb_disable_remote_wakeup - disable remote wakeup for a device
3180 : : * @udev: target device
3181 : : *
3182 : : * For USB-2 devices: Clear the device's remote wakeup feature.
3183 : : *
3184 : : * For USB-3 devices: Assume there's only one function on the device and
3185 : : * disable remote wake for the first interface. FIXME if the interface
3186 : : * association descriptor shows there's more than one function.
3187 : : */
3188 : 0 : static int usb_disable_remote_wakeup(struct usb_device *udev)
3189 : : {
3190 [ # # ]: 0 : if (udev->speed < USB_SPEED_SUPER)
3191 : 0 : return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3192 : : USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
3193 : : USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0,
3194 : : USB_CTRL_SET_TIMEOUT);
3195 : : else
3196 : 0 : return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3197 : : USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE,
3198 : : USB_INTRF_FUNC_SUSPEND, 0, NULL, 0,
3199 : : USB_CTRL_SET_TIMEOUT);
3200 : : }
3201 : :
3202 : : /* Count of wakeup-enabled devices at or below udev */
3203 : 0 : unsigned usb_wakeup_enabled_descendants(struct usb_device *udev)
3204 : : {
3205 : : struct usb_hub *hub = usb_hub_to_struct_hub(udev);
3206 : :
3207 : 0 : return udev->do_remote_wakeup +
3208 [ # # # # : 0 : (hub ? hub->wakeup_enabled_descendants : 0);
# # ]
3209 : : }
3210 : : EXPORT_SYMBOL_GPL(usb_wakeup_enabled_descendants);
3211 : :
3212 : : /*
3213 : : * usb_port_suspend - suspend a usb device's upstream port
3214 : : * @udev: device that's no longer in active use, not a root hub
3215 : : * Context: must be able to sleep; device not locked; pm locks held
3216 : : *
3217 : : * Suspends a USB device that isn't in active use, conserving power.
3218 : : * Devices may wake out of a suspend, if anything important happens,
3219 : : * using the remote wakeup mechanism. They may also be taken out of
3220 : : * suspend by the host, using usb_port_resume(). It's also routine
3221 : : * to disconnect devices while they are suspended.
3222 : : *
3223 : : * This only affects the USB hardware for a device; its interfaces
3224 : : * (and, for hubs, child devices) must already have been suspended.
3225 : : *
3226 : : * Selective port suspend reduces power; most suspended devices draw
3227 : : * less than 500 uA. It's also used in OTG, along with remote wakeup.
3228 : : * All devices below the suspended port are also suspended.
3229 : : *
3230 : : * Devices leave suspend state when the host wakes them up. Some devices
3231 : : * also support "remote wakeup", where the device can activate the USB
3232 : : * tree above them to deliver data, such as a keypress or packet. In
3233 : : * some cases, this wakes the USB host.
3234 : : *
3235 : : * Suspending OTG devices may trigger HNP, if that's been enabled
3236 : : * between a pair of dual-role devices. That will change roles, such
3237 : : * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
3238 : : *
3239 : : * Devices on USB hub ports have only one "suspend" state, corresponding
3240 : : * to ACPI D2, "may cause the device to lose some context".
3241 : : * State transitions include:
3242 : : *
3243 : : * - suspend, resume ... when the VBUS power link stays live
3244 : : * - suspend, disconnect ... VBUS lost
3245 : : *
3246 : : * Once VBUS drop breaks the circuit, the port it's using has to go through
3247 : : * normal re-enumeration procedures, starting with enabling VBUS power.
3248 : : * Other than re-initializing the hub (plug/unplug, except for root hubs),
3249 : : * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq
3250 : : * timer, no SRP, no requests through sysfs.
3251 : : *
3252 : : * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get
3253 : : * suspended until their bus goes into global suspend (i.e., the root
3254 : : * hub is suspended). Nevertheless, we change @udev->state to
3255 : : * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual
3256 : : * upstream port setting is stored in @udev->port_is_suspended.
3257 : : *
3258 : : * Returns 0 on success, else negative errno.
3259 : : */
3260 : 0 : int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
3261 : : {
3262 : 0 : struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
3263 : 0 : struct usb_port *port_dev = hub->ports[udev->portnum - 1];
3264 : 0 : int port1 = udev->portnum;
3265 : : int status;
3266 : : bool really_suspend = true;
3267 : :
3268 : : usb_lock_port(port_dev);
3269 : :
3270 : : /* enable remote wakeup when appropriate; this lets the device
3271 : : * wake up the upstream hub (including maybe the root hub).
3272 : : *
3273 : : * NOTE: OTG devices may issue remote wakeup (or SRP) even when
3274 : : * we don't explicitly enable it here.
3275 : : */
3276 [ # # ]: 0 : if (udev->do_remote_wakeup) {
3277 : 0 : status = usb_enable_remote_wakeup(udev);
3278 [ # # ]: 0 : if (status) {
3279 : : dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
3280 : : status);
3281 : : /* bail if autosuspend is requested */
3282 [ # # ]: 0 : if (PMSG_IS_AUTO(msg))
3283 : : goto err_wakeup;
3284 : : }
3285 : : }
3286 : :
3287 : : /* disable USB2 hardware LPM */
3288 : 0 : usb_disable_usb2_hardware_lpm(udev);
3289 : :
3290 [ # # ]: 0 : if (usb_disable_ltm(udev)) {
3291 : 0 : dev_err(&udev->dev, "Failed to disable LTM before suspend\n");
3292 : : status = -ENOMEM;
3293 [ # # ]: 0 : if (PMSG_IS_AUTO(msg))
3294 : : goto err_ltm;
3295 : : }
3296 : :
3297 : : /* see 7.1.7.6 */
3298 [ # # ]: 0 : if (hub_is_superspeed(hub->hdev))
3299 : : status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3);
3300 : :
3301 : : /*
3302 : : * For system suspend, we do not need to enable the suspend feature
3303 : : * on individual USB-2 ports. The devices will automatically go
3304 : : * into suspend a few ms after the root hub stops sending packets.
3305 : : * The USB 2.0 spec calls this "global suspend".
3306 : : *
3307 : : * However, many USB hubs have a bug: They don't relay wakeup requests
3308 : : * from a downstream port if the port's suspend feature isn't on.
3309 : : * Therefore we will turn on the suspend feature if udev or any of its
3310 : : * descendants is enabled for remote wakeup.
3311 : : */
3312 [ # # # # ]: 0 : else if (PMSG_IS_AUTO(msg) || usb_wakeup_enabled_descendants(udev) > 0)
3313 : 0 : status = set_port_feature(hub->hdev, port1,
3314 : : USB_PORT_FEAT_SUSPEND);
3315 : : else {
3316 : : really_suspend = false;
3317 : : status = 0;
3318 : : }
3319 [ # # ]: 0 : if (status) {
3320 : : dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status);
3321 : :
3322 : : /* Try to enable USB3 LTM again */
3323 : 0 : usb_enable_ltm(udev);
3324 : : err_ltm:
3325 : : /* Try to enable USB2 hardware LPM again */
3326 : 0 : usb_enable_usb2_hardware_lpm(udev);
3327 : :
3328 [ # # ]: 0 : if (udev->do_remote_wakeup)
3329 : 0 : (void) usb_disable_remote_wakeup(udev);
3330 : : err_wakeup:
3331 : :
3332 : : /* System sleep transitions should never fail */
3333 [ # # ]: 0 : if (!PMSG_IS_AUTO(msg))
3334 : : status = 0;
3335 : : } else {
3336 : : dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n",
3337 : : (PMSG_IS_AUTO(msg) ? "auto-" : ""),
3338 : : udev->do_remote_wakeup);
3339 [ # # ]: 0 : if (really_suspend) {
3340 : 0 : udev->port_is_suspended = 1;
3341 : :
3342 : : /* device has up to 10 msec to fully suspend */
3343 : 0 : msleep(10);
3344 : : }
3345 : 0 : usb_set_device_state(udev, USB_STATE_SUSPENDED);
3346 : : }
3347 : :
3348 [ # # # # : 0 : if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled
# # ]
3349 [ # # ]: 0 : && test_and_clear_bit(port1, hub->child_usage_bits))
3350 : 0 : pm_runtime_put_sync(&port_dev->dev);
3351 : :
3352 : 0 : usb_mark_last_busy(hub->hdev);
3353 : :
3354 : : usb_unlock_port(port_dev);
3355 : 0 : return status;
3356 : : }
3357 : :
3358 : : /*
3359 : : * If the USB "suspend" state is in use (rather than "global suspend"),
3360 : : * many devices will be individually taken out of suspend state using
3361 : : * special "resume" signaling. This routine kicks in shortly after
3362 : : * hardware resume signaling is finished, either because of selective
3363 : : * resume (by host) or remote wakeup (by device) ... now see what changed
3364 : : * in the tree that's rooted at this device.
3365 : : *
3366 : : * If @udev->reset_resume is set then the device is reset before the
3367 : : * status check is done.
3368 : : */
3369 : 0 : static int finish_port_resume(struct usb_device *udev)
3370 : : {
3371 : : int status = 0;
3372 : 0 : u16 devstatus = 0;
3373 : :
3374 : : /* caller owns the udev device lock */
3375 : : dev_dbg(&udev->dev, "%s\n",
3376 : : udev->reset_resume ? "finish reset-resume" : "finish resume");
3377 : :
3378 : : /* usb ch9 identifies four variants of SUSPENDED, based on what
3379 : : * state the device resumes to. Linux currently won't see the
3380 : : * first two on the host side; they'd be inside hub_port_init()
3381 : : * during many timeouts, but hub_wq can't suspend until later.
3382 : : */
3383 [ # # ]: 0 : usb_set_device_state(udev, udev->actconfig
3384 : : ? USB_STATE_CONFIGURED
3385 : : : USB_STATE_ADDRESS);
3386 : :
3387 : : /* 10.5.4.5 says not to reset a suspended port if the attached
3388 : : * device is enabled for remote wakeup. Hence the reset
3389 : : * operation is carried out here, after the port has been
3390 : : * resumed.
3391 : : */
3392 [ # # ]: 0 : if (udev->reset_resume) {
3393 : : /*
3394 : : * If the device morphs or switches modes when it is reset,
3395 : : * we don't want to perform a reset-resume. We'll fail the
3396 : : * resume, which will cause a logical disconnect, and then
3397 : : * the device will be rediscovered.
3398 : : */
3399 : : retry_reset_resume:
3400 [ # # ]: 0 : if (udev->quirks & USB_QUIRK_RESET)
3401 : : status = -ENODEV;
3402 : : else
3403 : 0 : status = usb_reset_and_verify_device(udev);
3404 : : }
3405 : :
3406 : : /* 10.5.4.5 says be sure devices in the tree are still there.
3407 : : * For now let's assume the device didn't go crazy on resume,
3408 : : * and device drivers will know about any resume quirks.
3409 : : */
3410 [ # # ]: 0 : if (status == 0) {
3411 : 0 : devstatus = 0;
3412 : : status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
3413 : :
3414 : : /* If a normal resume failed, try doing a reset-resume */
3415 [ # # # # : 0 : if (status && !udev->reset_resume && udev->persist_enabled) {
# # ]
3416 : : dev_dbg(&udev->dev, "retry with reset-resume\n");
3417 : 0 : udev->reset_resume = 1;
3418 : 0 : goto retry_reset_resume;
3419 : : }
3420 : : }
3421 : :
3422 [ # # ]: 0 : if (status) {
3423 : : dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
3424 : : status);
3425 : : /*
3426 : : * There are a few quirky devices which violate the standard
3427 : : * by claiming to have remote wakeup enabled after a reset,
3428 : : * which crash if the feature is cleared, hence check for
3429 : : * udev->reset_resume
3430 : : */
3431 [ # # # # ]: 0 : } else if (udev->actconfig && !udev->reset_resume) {
3432 [ # # ]: 0 : if (udev->speed < USB_SPEED_SUPER) {
3433 [ # # ]: 0 : if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
3434 : 0 : status = usb_disable_remote_wakeup(udev);
3435 : : } else {
3436 : : status = usb_get_std_status(udev, USB_RECIP_INTERFACE, 0,
3437 : : &devstatus);
3438 [ # # # # ]: 0 : if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP
3439 : : | USB_INTRF_STAT_FUNC_RW))
3440 : 0 : status = usb_disable_remote_wakeup(udev);
3441 : : }
3442 : :
3443 : : if (status)
3444 : : dev_dbg(&udev->dev,
3445 : : "disable remote wakeup, status %d\n",
3446 : : status);
3447 : : status = 0;
3448 : : }
3449 : 0 : return status;
3450 : : }
3451 : :
3452 : : /*
3453 : : * There are some SS USB devices which take longer time for link training.
3454 : : * XHCI specs 4.19.4 says that when Link training is successful, port
3455 : : * sets CCS bit to 1. So if SW reads port status before successful link
3456 : : * training, then it will not find device to be present.
3457 : : * USB Analyzer log with such buggy devices show that in some cases
3458 : : * device switch on the RX termination after long delay of host enabling
3459 : : * the VBUS. In few other cases it has been seen that device fails to
3460 : : * negotiate link training in first attempt. It has been
3461 : : * reported till now that few devices take as long as 2000 ms to train
3462 : : * the link after host enabling its VBUS and termination. Following
3463 : : * routine implements a 2000 ms timeout for link training. If in a case
3464 : : * link trains before timeout, loop will exit earlier.
3465 : : *
3466 : : * There are also some 2.0 hard drive based devices and 3.0 thumb
3467 : : * drives that, when plugged into a 2.0 only port, take a long
3468 : : * time to set CCS after VBUS enable.
3469 : : *
3470 : : * FIXME: If a device was connected before suspend, but was removed
3471 : : * while system was asleep, then the loop in the following routine will
3472 : : * only exit at timeout.
3473 : : *
3474 : : * This routine should only be called when persist is enabled.
3475 : : */
3476 : 0 : static int wait_for_connected(struct usb_device *udev,
3477 : : struct usb_hub *hub, int *port1,
3478 : : u16 *portchange, u16 *portstatus)
3479 : : {
3480 : : int status = 0, delay_ms = 0;
3481 : :
3482 [ # # ]: 0 : while (delay_ms < 2000) {
3483 [ # # # # ]: 0 : if (status || *portstatus & USB_PORT_STAT_CONNECTION)
3484 : : break;
3485 [ # # ]: 0 : if (!port_is_power_on(hub, *portstatus)) {
3486 : : status = -ENODEV;
3487 : : break;
3488 : : }
3489 : 0 : msleep(20);
3490 : 0 : delay_ms += 20;
3491 : 0 : status = hub_port_status(hub, *port1, portstatus, portchange);
3492 : : }
3493 : : dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms);
3494 : 0 : return status;
3495 : : }
3496 : :
3497 : : /*
3498 : : * usb_port_resume - re-activate a suspended usb device's upstream port
3499 : : * @udev: device to re-activate, not a root hub
3500 : : * Context: must be able to sleep; device not locked; pm locks held
3501 : : *
3502 : : * This will re-activate the suspended device, increasing power usage
3503 : : * while letting drivers communicate again with its endpoints.
3504 : : * USB resume explicitly guarantees that the power session between
3505 : : * the host and the device is the same as it was when the device
3506 : : * suspended.
3507 : : *
3508 : : * If @udev->reset_resume is set then this routine won't check that the
3509 : : * port is still enabled. Furthermore, finish_port_resume() above will
3510 : : * reset @udev. The end result is that a broken power session can be
3511 : : * recovered and @udev will appear to persist across a loss of VBUS power.
3512 : : *
3513 : : * For example, if a host controller doesn't maintain VBUS suspend current
3514 : : * during a system sleep or is reset when the system wakes up, all the USB
3515 : : * power sessions below it will be broken. This is especially troublesome
3516 : : * for mass-storage devices containing mounted filesystems, since the
3517 : : * device will appear to have disconnected and all the memory mappings
3518 : : * to it will be lost. Using the USB_PERSIST facility, the device can be
3519 : : * made to appear as if it had not disconnected.
3520 : : *
3521 : : * This facility can be dangerous. Although usb_reset_and_verify_device() makes
3522 : : * every effort to insure that the same device is present after the
3523 : : * reset as before, it cannot provide a 100% guarantee. Furthermore it's
3524 : : * quite possible for a device to remain unaltered but its media to be
3525 : : * changed. If the user replaces a flash memory card while the system is
3526 : : * asleep, he will have only himself to blame when the filesystem on the
3527 : : * new card is corrupted and the system crashes.
3528 : : *
3529 : : * Returns 0 on success, else negative errno.
3530 : : */
3531 : 0 : int usb_port_resume(struct usb_device *udev, pm_message_t msg)
3532 : : {
3533 : 0 : struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
3534 : 0 : struct usb_port *port_dev = hub->ports[udev->portnum - 1];
3535 : 0 : int port1 = udev->portnum;
3536 : : int status;
3537 : : u16 portchange, portstatus;
3538 : :
3539 [ # # ]: 0 : if (!test_and_set_bit(port1, hub->child_usage_bits)) {
3540 : 0 : status = pm_runtime_get_sync(&port_dev->dev);
3541 [ # # ]: 0 : if (status < 0) {
3542 : : dev_dbg(&udev->dev, "can't resume usb port, status %d\n",
3543 : : status);
3544 : : return status;
3545 : : }
3546 : : }
3547 : :
3548 : : usb_lock_port(port_dev);
3549 : :
3550 : : /* Skip the initial Clear-Suspend step for a remote wakeup */
3551 : 0 : status = hub_port_status(hub, port1, &portstatus, &portchange);
3552 [ # # # # ]: 0 : if (status == 0 && !port_is_suspended(hub, portstatus)) {
3553 : : if (portchange & USB_PORT_STAT_C_SUSPEND)
3554 : : pm_wakeup_event(&udev->dev, 0);
3555 : : goto SuspendCleared;
3556 : : }
3557 : :
3558 : : /* see 7.1.7.7; affects power usage, but not budgeting */
3559 [ # # ]: 0 : if (hub_is_superspeed(hub->hdev))
3560 : 0 : status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0);
3561 : : else
3562 : 0 : status = usb_clear_port_feature(hub->hdev,
3563 : : port1, USB_PORT_FEAT_SUSPEND);
3564 [ # # ]: 0 : if (status) {
3565 : : dev_dbg(&port_dev->dev, "can't resume, status %d\n", status);
3566 : : } else {
3567 : : /* drive resume for USB_RESUME_TIMEOUT msec */
3568 : : dev_dbg(&udev->dev, "usb %sresume\n",
3569 : : (PMSG_IS_AUTO(msg) ? "auto-" : ""));
3570 : 0 : msleep(USB_RESUME_TIMEOUT);
3571 : :
3572 : : /* Virtual root hubs can trigger on GET_PORT_STATUS to
3573 : : * stop resume signaling. Then finish the resume
3574 : : * sequence.
3575 : : */
3576 : 0 : status = hub_port_status(hub, port1, &portstatus, &portchange);
3577 : :
3578 : : /* TRSMRCY = 10 msec */
3579 : 0 : msleep(10);
3580 : : }
3581 : :
3582 : : SuspendCleared:
3583 [ # # ]: 0 : if (status == 0) {
3584 : 0 : udev->port_is_suspended = 0;
3585 [ # # ]: 0 : if (hub_is_superspeed(hub->hdev)) {
3586 [ # # ]: 0 : if (portchange & USB_PORT_STAT_C_LINK_STATE)
3587 : 0 : usb_clear_port_feature(hub->hdev, port1,
3588 : : USB_PORT_FEAT_C_PORT_LINK_STATE);
3589 : : } else {
3590 [ # # ]: 0 : if (portchange & USB_PORT_STAT_C_SUSPEND)
3591 : 0 : usb_clear_port_feature(hub->hdev, port1,
3592 : : USB_PORT_FEAT_C_SUSPEND);
3593 : : }
3594 : : }
3595 : :
3596 [ # # ]: 0 : if (udev->persist_enabled)
3597 : 0 : status = wait_for_connected(udev, hub, &port1, &portchange,
3598 : : &portstatus);
3599 : :
3600 : 0 : status = check_port_resume_type(udev,
3601 : : hub, port1, status, portchange, portstatus);
3602 [ # # ]: 0 : if (status == 0)
3603 : 0 : status = finish_port_resume(udev);
3604 [ # # ]: 0 : if (status < 0) {
3605 : : dev_dbg(&udev->dev, "can't resume, status %d\n", status);
3606 : 0 : hub_port_logical_disconnect(hub, port1);
3607 : : } else {
3608 : : /* Try to enable USB2 hardware LPM */
3609 : 0 : usb_enable_usb2_hardware_lpm(udev);
3610 : :
3611 : : /* Try to enable USB3 LTM */
3612 : 0 : usb_enable_ltm(udev);
3613 : : }
3614 : :
3615 : : usb_unlock_port(port_dev);
3616 : :
3617 : 0 : return status;
3618 : : }
3619 : :
3620 : 0 : int usb_remote_wakeup(struct usb_device *udev)
3621 : : {
3622 : : int status = 0;
3623 : :
3624 : : usb_lock_device(udev);
3625 [ # # ]: 0 : if (udev->state == USB_STATE_SUSPENDED) {
3626 : : dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
3627 : 0 : status = usb_autoresume_device(udev);
3628 [ # # ]: 0 : if (status == 0) {
3629 : : /* Let the drivers do their thing, then... */
3630 : 0 : usb_autosuspend_device(udev);
3631 : : }
3632 : : }
3633 : : usb_unlock_device(udev);
3634 : 0 : return status;
3635 : : }
3636 : :
3637 : : /* Returns 1 if there was a remote wakeup and a connect status change. */
3638 : 1047 : static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
3639 : : u16 portstatus, u16 portchange)
3640 : : __must_hold(&port_dev->status_lock)
3641 : : {
3642 : 1047 : struct usb_port *port_dev = hub->ports[port - 1];
3643 : : struct usb_device *hdev;
3644 : : struct usb_device *udev;
3645 : : int connect_change = 0;
3646 : : u16 link_state;
3647 : : int ret;
3648 : :
3649 : 1047 : hdev = hub->hdev;
3650 : 1047 : udev = port_dev->child;
3651 [ + - ]: 1047 : if (!hub_is_superspeed(hdev)) {
3652 [ - + ]: 1047 : if (!(portchange & USB_PORT_STAT_C_SUSPEND))
3653 : : return 0;
3654 : 0 : usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND);
3655 : : } else {
3656 : 0 : link_state = portstatus & USB_PORT_STAT_LINK_STATE;
3657 [ # # # # : 0 : if (!udev || udev->state != USB_STATE_SUSPENDED ||
# # ]
3658 : 0 : (link_state != USB_SS_PORT_LS_U0 &&
3659 [ # # ]: 0 : link_state != USB_SS_PORT_LS_U1 &&
3660 : : link_state != USB_SS_PORT_LS_U2))
3661 : : return 0;
3662 : : }
3663 : :
3664 [ # # ]: 0 : if (udev) {
3665 : : /* TRSMRCY = 10 msec */
3666 : 0 : msleep(10);
3667 : :
3668 : : usb_unlock_port(port_dev);
3669 : 0 : ret = usb_remote_wakeup(udev);
3670 : : usb_lock_port(port_dev);
3671 [ # # ]: 0 : if (ret < 0)
3672 : : connect_change = 1;
3673 : : } else {
3674 : : ret = -ENODEV;
3675 : 0 : hub_port_disable(hub, port, 1);
3676 : : }
3677 : : dev_dbg(&port_dev->dev, "resume, status %d\n", ret);
3678 : 0 : return connect_change;
3679 : : }
3680 : :
3681 : 0 : static int check_ports_changed(struct usb_hub *hub)
3682 : : {
3683 : : int port1;
3684 : :
3685 [ # # ]: 0 : for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) {
3686 : : u16 portstatus, portchange;
3687 : : int status;
3688 : :
3689 : : status = hub_port_status(hub, port1, &portstatus, &portchange);
3690 [ # # # # ]: 0 : if (!status && portchange)
3691 : 0 : return 1;
3692 : : }
3693 : : return 0;
3694 : : }
3695 : :
3696 : 0 : static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
3697 : : {
3698 : : struct usb_hub *hub = usb_get_intfdata(intf);
3699 : 0 : struct usb_device *hdev = hub->hdev;
3700 : : unsigned port1;
3701 : :
3702 : : /*
3703 : : * Warn if children aren't already suspended.
3704 : : * Also, add up the number of wakeup-enabled descendants.
3705 : : */
3706 : 0 : hub->wakeup_enabled_descendants = 0;
3707 [ # # ]: 0 : for (port1 = 1; port1 <= hdev->maxchild; port1++) {
3708 : 0 : struct usb_port *port_dev = hub->ports[port1 - 1];
3709 : 0 : struct usb_device *udev = port_dev->child;
3710 : :
3711 [ # # # # ]: 0 : if (udev && udev->can_submit) {
3712 : 0 : dev_warn(&port_dev->dev, "device %s not suspended yet\n",
3713 : : dev_name(&udev->dev));
3714 [ # # ]: 0 : if (PMSG_IS_AUTO(msg))
3715 : : return -EBUSY;
3716 : : }
3717 [ # # ]: 0 : if (udev)
3718 : 0 : hub->wakeup_enabled_descendants +=
3719 : : usb_wakeup_enabled_descendants(udev);
3720 : : }
3721 : :
3722 [ # # # # ]: 0 : if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) {
3723 : : /* check if there are changes pending on hub ports */
3724 [ # # ]: 0 : if (check_ports_changed(hub)) {
3725 [ # # ]: 0 : if (PMSG_IS_AUTO(msg))
3726 : : return -EBUSY;
3727 : : pm_wakeup_event(&hdev->dev, 2000);
3728 : : }
3729 : : }
3730 : :
3731 [ # # # # ]: 0 : if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) {
3732 : : /* Enable hub to send remote wakeup for all ports. */
3733 [ # # ]: 0 : for (port1 = 1; port1 <= hdev->maxchild; port1++) {
3734 : 0 : set_port_feature(hdev,
3735 : : port1 |
3736 : : USB_PORT_FEAT_REMOTE_WAKE_CONNECT |
3737 : 0 : USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT |
3738 : : USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT,
3739 : : USB_PORT_FEAT_REMOTE_WAKE_MASK);
3740 : : }
3741 : : }
3742 : :
3743 : : dev_dbg(&intf->dev, "%s\n", __func__);
3744 : :
3745 : : /* stop hub_wq and related activity */
3746 : 0 : hub_quiesce(hub, HUB_SUSPEND);
3747 : 0 : return 0;
3748 : : }
3749 : :
3750 : : /* Report wakeup requests from the ports of a resuming root hub */
3751 : 0 : static void report_wakeup_requests(struct usb_hub *hub)
3752 : : {
3753 : 0 : struct usb_device *hdev = hub->hdev;
3754 : : struct usb_device *udev;
3755 : : struct usb_hcd *hcd;
3756 : : unsigned long resuming_ports;
3757 : : int i;
3758 : :
3759 [ # # ]: 0 : if (hdev->parent)
3760 : 0 : return; /* Not a root hub */
3761 : :
3762 : 0 : hcd = bus_to_hcd(hdev->bus);
3763 [ # # ]: 0 : if (hcd->driver->get_resuming_ports) {
3764 : :
3765 : : /*
3766 : : * The get_resuming_ports() method returns a bitmap (origin 0)
3767 : : * of ports which have started wakeup signaling but have not
3768 : : * yet finished resuming. During system resume we will
3769 : : * resume all the enabled ports, regardless of any wakeup
3770 : : * signals, which means the wakeup requests would be lost.
3771 : : * To prevent this, report them to the PM core here.
3772 : : */
3773 : 0 : resuming_ports = hcd->driver->get_resuming_ports(hcd);
3774 [ # # ]: 0 : for (i = 0; i < hdev->maxchild; ++i) {
3775 : : if (test_bit(i, &resuming_ports)) {
3776 : : udev = hub->ports[i]->child;
3777 : : if (udev)
3778 : : pm_wakeup_event(&udev->dev, 0);
3779 : : }
3780 : : }
3781 : : }
3782 : : }
3783 : :
3784 : 0 : static int hub_resume(struct usb_interface *intf)
3785 : : {
3786 : : struct usb_hub *hub = usb_get_intfdata(intf);
3787 : :
3788 : : dev_dbg(&intf->dev, "%s\n", __func__);
3789 : 0 : hub_activate(hub, HUB_RESUME);
3790 : :
3791 : : /*
3792 : : * This should be called only for system resume, not runtime resume.
3793 : : * We can't tell the difference here, so some wakeup requests will be
3794 : : * reported at the wrong time or more than once. This shouldn't
3795 : : * matter much, so long as they do get reported.
3796 : : */
3797 : 0 : report_wakeup_requests(hub);
3798 : 0 : return 0;
3799 : : }
3800 : :
3801 : 0 : static int hub_reset_resume(struct usb_interface *intf)
3802 : : {
3803 : : struct usb_hub *hub = usb_get_intfdata(intf);
3804 : :
3805 : : dev_dbg(&intf->dev, "%s\n", __func__);
3806 : 0 : hub_activate(hub, HUB_RESET_RESUME);
3807 : 0 : return 0;
3808 : : }
3809 : :
3810 : : /**
3811 : : * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
3812 : : * @rhdev: struct usb_device for the root hub
3813 : : *
3814 : : * The USB host controller driver calls this function when its root hub
3815 : : * is resumed and Vbus power has been interrupted or the controller
3816 : : * has been reset. The routine marks @rhdev as having lost power.
3817 : : * When the hub driver is resumed it will take notice and carry out
3818 : : * power-session recovery for all the "USB-PERSIST"-enabled child devices;
3819 : : * the others will be disconnected.
3820 : : */
3821 : 0 : void usb_root_hub_lost_power(struct usb_device *rhdev)
3822 : : {
3823 : 0 : dev_notice(&rhdev->dev, "root hub lost power or was reset\n");
3824 : 0 : rhdev->reset_resume = 1;
3825 : 0 : }
3826 : : EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
3827 : :
3828 : : static const char * const usb3_lpm_names[] = {
3829 : : "U0",
3830 : : "U1",
3831 : : "U2",
3832 : : "U3",
3833 : : };
3834 : :
3835 : : /*
3836 : : * Send a Set SEL control transfer to the device, prior to enabling
3837 : : * device-initiated U1 or U2. This lets the device know the exit latencies from
3838 : : * the time the device initiates a U1 or U2 exit, to the time it will receive a
3839 : : * packet from the host.
3840 : : *
3841 : : * This function will fail if the SEL or PEL values for udev are greater than
3842 : : * the maximum allowed values for the link state to be enabled.
3843 : : */
3844 : 0 : static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state)
3845 : : {
3846 : : struct usb_set_sel_req *sel_values;
3847 : : unsigned long long u1_sel;
3848 : : unsigned long long u1_pel;
3849 : : unsigned long long u2_sel;
3850 : : unsigned long long u2_pel;
3851 : : int ret;
3852 : :
3853 [ # # ]: 0 : if (udev->state != USB_STATE_CONFIGURED)
3854 : : return 0;
3855 : :
3856 : : /* Convert SEL and PEL stored in ns to us */
3857 : 0 : u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
3858 : 0 : u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000);
3859 : 0 : u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
3860 : 0 : u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000);
3861 : :
3862 : : /*
3863 : : * Make sure that the calculated SEL and PEL values for the link
3864 : : * state we're enabling aren't bigger than the max SEL/PEL
3865 : : * value that will fit in the SET SEL control transfer.
3866 : : * Otherwise the device would get an incorrect idea of the exit
3867 : : * latency for the link state, and could start a device-initiated
3868 : : * U1/U2 when the exit latencies are too high.
3869 : : */
3870 [ # # # # ]: 0 : if ((state == USB3_LPM_U1 &&
3871 : 0 : (u1_sel > USB3_LPM_MAX_U1_SEL_PEL ||
3872 [ # # ]: 0 : u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) ||
3873 [ # # ]: 0 : (state == USB3_LPM_U2 &&
3874 : 0 : (u2_sel > USB3_LPM_MAX_U2_SEL_PEL ||
3875 : 0 : u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) {
3876 : : dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n",
3877 : : usb3_lpm_names[state], u1_sel, u1_pel);
3878 : : return -EINVAL;
3879 : : }
3880 : :
3881 : : /*
3882 : : * If we're enabling device-initiated LPM for one link state,
3883 : : * but the other link state has a too high SEL or PEL value,
3884 : : * just set those values to the max in the Set SEL request.
3885 : : */
3886 [ # # ]: 0 : if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL)
3887 : : u1_sel = USB3_LPM_MAX_U1_SEL_PEL;
3888 : :
3889 [ # # ]: 0 : if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL)
3890 : : u1_pel = USB3_LPM_MAX_U1_SEL_PEL;
3891 : :
3892 [ # # ]: 0 : if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL)
3893 : : u2_sel = USB3_LPM_MAX_U2_SEL_PEL;
3894 : :
3895 [ # # ]: 0 : if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL)
3896 : : u2_pel = USB3_LPM_MAX_U2_SEL_PEL;
3897 : :
3898 : : /*
3899 : : * usb_enable_lpm() can be called as part of a failed device reset,
3900 : : * which may be initiated by an error path of a mass storage driver.
3901 : : * Therefore, use GFP_NOIO.
3902 : : */
3903 : : sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO);
3904 [ # # ]: 0 : if (!sel_values)
3905 : : return -ENOMEM;
3906 : :
3907 : 0 : sel_values->u1_sel = u1_sel;
3908 : 0 : sel_values->u1_pel = u1_pel;
3909 : 0 : sel_values->u2_sel = cpu_to_le16(u2_sel);
3910 : 0 : sel_values->u2_pel = cpu_to_le16(u2_pel);
3911 : :
3912 : 0 : ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3913 : : USB_REQ_SET_SEL,
3914 : : USB_RECIP_DEVICE,
3915 : : 0, 0,
3916 : : sel_values, sizeof *(sel_values),
3917 : : USB_CTRL_SET_TIMEOUT);
3918 : 0 : kfree(sel_values);
3919 : 0 : return ret;
3920 : : }
3921 : :
3922 : : /*
3923 : : * Enable or disable device-initiated U1 or U2 transitions.
3924 : : */
3925 : 0 : static int usb_set_device_initiated_lpm(struct usb_device *udev,
3926 : : enum usb3_link_state state, bool enable)
3927 : : {
3928 : : int ret;
3929 : : int feature;
3930 : :
3931 [ # # # ]: 0 : switch (state) {
3932 : : case USB3_LPM_U1:
3933 : : feature = USB_DEVICE_U1_ENABLE;
3934 : : break;
3935 : : case USB3_LPM_U2:
3936 : : feature = USB_DEVICE_U2_ENABLE;
3937 : 0 : break;
3938 : : default:
3939 [ # # ]: 0 : dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n",
3940 : : __func__, enable ? "enable" : "disable");
3941 : 0 : return -EINVAL;
3942 : : }
3943 : :
3944 [ # # ]: 0 : if (udev->state != USB_STATE_CONFIGURED) {
3945 : : dev_dbg(&udev->dev, "%s: Can't %s %s state "
3946 : : "for unconfigured device.\n",
3947 : : __func__, enable ? "enable" : "disable",
3948 : : usb3_lpm_names[state]);
3949 : : return 0;
3950 : : }
3951 : :
3952 [ # # ]: 0 : if (enable) {
3953 : : /*
3954 : : * Now send the control transfer to enable device-initiated LPM
3955 : : * for either U1 or U2.
3956 : : */
3957 : 0 : ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3958 : : USB_REQ_SET_FEATURE,
3959 : : USB_RECIP_DEVICE,
3960 : : feature,
3961 : : 0, NULL, 0,
3962 : : USB_CTRL_SET_TIMEOUT);
3963 : : } else {
3964 : 0 : ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3965 : : USB_REQ_CLEAR_FEATURE,
3966 : : USB_RECIP_DEVICE,
3967 : : feature,
3968 : : 0, NULL, 0,
3969 : : USB_CTRL_SET_TIMEOUT);
3970 : : }
3971 [ # # ]: 0 : if (ret < 0) {
3972 [ # # ]: 0 : dev_warn(&udev->dev, "%s of device-initiated %s failed.\n",
3973 : : enable ? "Enable" : "Disable",
3974 : : usb3_lpm_names[state]);
3975 : 0 : return -EBUSY;
3976 : : }
3977 : : return 0;
3978 : : }
3979 : :
3980 : 0 : static int usb_set_lpm_timeout(struct usb_device *udev,
3981 : : enum usb3_link_state state, int timeout)
3982 : : {
3983 : : int ret;
3984 : : int feature;
3985 : :
3986 [ # # # ]: 0 : switch (state) {
3987 : : case USB3_LPM_U1:
3988 : : feature = USB_PORT_FEAT_U1_TIMEOUT;
3989 : : break;
3990 : : case USB3_LPM_U2:
3991 : : feature = USB_PORT_FEAT_U2_TIMEOUT;
3992 : 0 : break;
3993 : : default:
3994 : 0 : dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n",
3995 : : __func__);
3996 : 0 : return -EINVAL;
3997 : : }
3998 : :
3999 [ # # # # ]: 0 : if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT &&
4000 : : timeout != USB3_LPM_DEVICE_INITIATED) {
4001 : 0 : dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, "
4002 : : "which is a reserved value.\n",
4003 : : usb3_lpm_names[state], timeout);
4004 : 0 : return -EINVAL;
4005 : : }
4006 : :
4007 : 0 : ret = set_port_feature(udev->parent,
4008 : 0 : USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum,
4009 : : feature);
4010 [ # # ]: 0 : if (ret < 0) {
4011 : 0 : dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x,"
4012 : : "error code %i\n", usb3_lpm_names[state],
4013 : : timeout, ret);
4014 : 0 : return -EBUSY;
4015 : : }
4016 [ # # ]: 0 : if (state == USB3_LPM_U1)
4017 : 0 : udev->u1_params.timeout = timeout;
4018 : : else
4019 : 0 : udev->u2_params.timeout = timeout;
4020 : : return 0;
4021 : : }
4022 : :
4023 : : /*
4024 : : * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
4025 : : * U1/U2 entry.
4026 : : *
4027 : : * We will attempt to enable U1 or U2, but there are no guarantees that the
4028 : : * control transfers to set the hub timeout or enable device-initiated U1/U2
4029 : : * will be successful.
4030 : : *
4031 : : * If the control transfer to enable device-initiated U1/U2 entry fails, then
4032 : : * hub-initiated U1/U2 will be disabled.
4033 : : *
4034 : : * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
4035 : : * driver know about it. If that call fails, it should be harmless, and just
4036 : : * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
4037 : : */
4038 : 0 : static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
4039 : : enum usb3_link_state state)
4040 : : {
4041 : : int timeout, ret;
4042 : 0 : __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat;
4043 : 0 : __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat;
4044 : :
4045 : : /* If the device says it doesn't have *any* exit latency to come out of
4046 : : * U1 or U2, it's probably lying. Assume it doesn't implement that link
4047 : : * state.
4048 : : */
4049 [ # # # # ]: 0 : if ((state == USB3_LPM_U1 && u1_mel == 0) ||
4050 : 0 : (state == USB3_LPM_U2 && u2_mel == 0))
4051 : : return;
4052 : :
4053 : : /*
4054 : : * First, let the device know about the exit latencies
4055 : : * associated with the link state we're about to enable.
4056 : : */
4057 : 0 : ret = usb_req_set_sel(udev, state);
4058 [ # # ]: 0 : if (ret < 0) {
4059 : 0 : dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n",
4060 : : usb3_lpm_names[state]);
4061 : 0 : return;
4062 : : }
4063 : :
4064 : : /* We allow the host controller to set the U1/U2 timeout internally
4065 : : * first, so that it can change its schedule to account for the
4066 : : * additional latency to send data to a device in a lower power
4067 : : * link state.
4068 : : */
4069 : 0 : timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state);
4070 : :
4071 : : /* xHCI host controller doesn't want to enable this LPM state. */
4072 [ # # ]: 0 : if (timeout == 0)
4073 : : return;
4074 : :
4075 [ # # ]: 0 : if (timeout < 0) {
4076 : 0 : dev_warn(&udev->dev, "Could not enable %s link state, "
4077 : : "xHCI error %i.\n", usb3_lpm_names[state],
4078 : : timeout);
4079 : 0 : return;
4080 : : }
4081 : :
4082 [ # # ]: 0 : if (usb_set_lpm_timeout(udev, state, timeout)) {
4083 : : /* If we can't set the parent hub U1/U2 timeout,
4084 : : * device-initiated LPM won't be allowed either, so let the xHCI
4085 : : * host know that this link state won't be enabled.
4086 : : */
4087 : 0 : hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);
4088 : 0 : return;
4089 : : }
4090 : :
4091 : : /* Only a configured device will accept the Set Feature
4092 : : * U1/U2_ENABLE
4093 : : */
4094 [ # # # # ]: 0 : if (udev->actconfig &&
4095 : 0 : usb_set_device_initiated_lpm(udev, state, true) == 0) {
4096 [ # # ]: 0 : if (state == USB3_LPM_U1)
4097 : 0 : udev->usb3_lpm_u1_enabled = 1;
4098 [ # # ]: 0 : else if (state == USB3_LPM_U2)
4099 : 0 : udev->usb3_lpm_u2_enabled = 1;
4100 : : } else {
4101 : : /* Don't request U1/U2 entry if the device
4102 : : * cannot transition to U1/U2.
4103 : : */
4104 : 0 : usb_set_lpm_timeout(udev, state, 0);
4105 : 0 : hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);
4106 : : }
4107 : : }
4108 : :
4109 : : /*
4110 : : * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
4111 : : * U1/U2 entry.
4112 : : *
4113 : : * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
4114 : : * If zero is returned, the parent will not allow the link to go into U1/U2.
4115 : : *
4116 : : * If zero is returned, device-initiated U1/U2 entry may still be enabled, but
4117 : : * it won't have an effect on the bus link state because the parent hub will
4118 : : * still disallow device-initiated U1/U2 entry.
4119 : : *
4120 : : * If zero is returned, the xHCI host controller may still think U1/U2 entry is
4121 : : * possible. The result will be slightly more bus bandwidth will be taken up
4122 : : * (to account for U1/U2 exit latency), but it should be harmless.
4123 : : */
4124 : 0 : static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
4125 : : enum usb3_link_state state)
4126 : : {
4127 [ # # ]: 0 : switch (state) {
4128 : : case USB3_LPM_U1:
4129 : : case USB3_LPM_U2:
4130 : : break;
4131 : : default:
4132 : 0 : dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n",
4133 : : __func__);
4134 : 0 : return -EINVAL;
4135 : : }
4136 : :
4137 [ # # ]: 0 : if (usb_set_lpm_timeout(udev, state, 0))
4138 : : return -EBUSY;
4139 : :
4140 : 0 : usb_set_device_initiated_lpm(udev, state, false);
4141 : :
4142 [ # # ]: 0 : if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state))
4143 : 0 : dev_warn(&udev->dev, "Could not disable xHCI %s timeout, "
4144 : : "bus schedule bandwidth may be impacted.\n",
4145 : : usb3_lpm_names[state]);
4146 : :
4147 : : /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM
4148 : : * is disabled. Hub will disallows link to enter U1/U2 as well,
4149 : : * even device is initiating LPM. Hence LPM is disabled if hub LPM
4150 : : * timeout set to 0, no matter device-initiated LPM is disabled or
4151 : : * not.
4152 : : */
4153 [ # # ]: 0 : if (state == USB3_LPM_U1)
4154 : 0 : udev->usb3_lpm_u1_enabled = 0;
4155 [ # # ]: 0 : else if (state == USB3_LPM_U2)
4156 : 0 : udev->usb3_lpm_u2_enabled = 0;
4157 : :
4158 : : return 0;
4159 : : }
4160 : :
4161 : : /*
4162 : : * Disable hub-initiated and device-initiated U1 and U2 entry.
4163 : : * Caller must own the bandwidth_mutex.
4164 : : *
4165 : : * This will call usb_enable_lpm() on failure, which will decrement
4166 : : * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
4167 : : */
4168 : 621 : int usb_disable_lpm(struct usb_device *udev)
4169 : : {
4170 : : struct usb_hcd *hcd;
4171 : :
4172 [ + - + - : 1242 : if (!udev || !udev->parent ||
- + ]
4173 [ # # ]: 621 : udev->speed < USB_SPEED_SUPER ||
4174 [ # # ]: 0 : !udev->lpm_capable ||
4175 : 0 : udev->state < USB_STATE_CONFIGURED)
4176 : : return 0;
4177 : :
4178 : 0 : hcd = bus_to_hcd(udev->bus);
4179 [ # # # # ]: 0 : if (!hcd || !hcd->driver->disable_usb3_lpm_timeout)
4180 : : return 0;
4181 : :
4182 : 0 : udev->lpm_disable_count++;
4183 [ # # # # ]: 0 : if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0))
4184 : : return 0;
4185 : :
4186 : : /* If LPM is enabled, attempt to disable it. */
4187 [ # # ]: 0 : if (usb_disable_link_state(hcd, udev, USB3_LPM_U1))
4188 : : goto enable_lpm;
4189 [ # # ]: 0 : if (usb_disable_link_state(hcd, udev, USB3_LPM_U2))
4190 : : goto enable_lpm;
4191 : :
4192 : : return 0;
4193 : :
4194 : : enable_lpm:
4195 : 0 : usb_enable_lpm(udev);
4196 : 0 : return -EBUSY;
4197 : : }
4198 : : EXPORT_SYMBOL_GPL(usb_disable_lpm);
4199 : :
4200 : : /* Grab the bandwidth_mutex before calling usb_disable_lpm() */
4201 : 207 : int usb_unlocked_disable_lpm(struct usb_device *udev)
4202 : : {
4203 : 207 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
4204 : : int ret;
4205 : :
4206 [ + - ]: 207 : if (!hcd)
4207 : : return -EINVAL;
4208 : :
4209 : 207 : mutex_lock(hcd->bandwidth_mutex);
4210 : 207 : ret = usb_disable_lpm(udev);
4211 : 207 : mutex_unlock(hcd->bandwidth_mutex);
4212 : :
4213 : 207 : return ret;
4214 : : }
4215 : : EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
4216 : :
4217 : : /*
4218 : : * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The
4219 : : * xHCI host policy may prevent U1 or U2 from being enabled.
4220 : : *
4221 : : * Other callers may have disabled link PM, so U1 and U2 entry will be disabled
4222 : : * until the lpm_disable_count drops to zero. Caller must own the
4223 : : * bandwidth_mutex.
4224 : : */
4225 : 1656 : void usb_enable_lpm(struct usb_device *udev)
4226 : : {
4227 : : struct usb_hcd *hcd;
4228 : : struct usb_hub *hub;
4229 : : struct usb_port *port_dev;
4230 : :
4231 [ + - + + : 3105 : if (!udev || !udev->parent ||
- + ]
4232 [ # # ]: 1449 : udev->speed < USB_SPEED_SUPER ||
4233 [ # # ]: 0 : !udev->lpm_capable ||
4234 : 0 : udev->state < USB_STATE_CONFIGURED)
4235 : : return;
4236 : :
4237 : 0 : udev->lpm_disable_count--;
4238 : 0 : hcd = bus_to_hcd(udev->bus);
4239 : : /* Double check that we can both enable and disable LPM.
4240 : : * Device must be configured to accept set feature U1/U2 timeout.
4241 : : */
4242 [ # # # # : 0 : if (!hcd || !hcd->driver->enable_usb3_lpm_timeout ||
# # ]
4243 : 0 : !hcd->driver->disable_usb3_lpm_timeout)
4244 : : return;
4245 : :
4246 [ # # ]: 0 : if (udev->lpm_disable_count > 0)
4247 : : return;
4248 : :
4249 : : hub = usb_hub_to_struct_hub(udev->parent);
4250 [ # # ]: 0 : if (!hub)
4251 : : return;
4252 : :
4253 : 0 : port_dev = hub->ports[udev->portnum - 1];
4254 : :
4255 [ # # ]: 0 : if (port_dev->usb3_lpm_u1_permit)
4256 : 0 : usb_enable_link_state(hcd, udev, USB3_LPM_U1);
4257 : :
4258 [ # # ]: 0 : if (port_dev->usb3_lpm_u2_permit)
4259 : 0 : usb_enable_link_state(hcd, udev, USB3_LPM_U2);
4260 : : }
4261 : : EXPORT_SYMBOL_GPL(usb_enable_lpm);
4262 : :
4263 : : /* Grab the bandwidth_mutex before calling usb_enable_lpm() */
4264 : 1656 : void usb_unlocked_enable_lpm(struct usb_device *udev)
4265 : : {
4266 : 1656 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
4267 : :
4268 [ + - ]: 1656 : if (!hcd)
4269 : 1656 : return;
4270 : :
4271 : 1656 : mutex_lock(hcd->bandwidth_mutex);
4272 : 1656 : usb_enable_lpm(udev);
4273 : 1656 : mutex_unlock(hcd->bandwidth_mutex);
4274 : : }
4275 : : EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
4276 : :
4277 : : /* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */
4278 : 0 : static void hub_usb3_port_prepare_disable(struct usb_hub *hub,
4279 : : struct usb_port *port_dev)
4280 : : {
4281 : 0 : struct usb_device *udev = port_dev->child;
4282 : : int ret;
4283 : :
4284 [ # # # # ]: 0 : if (udev && udev->port_is_suspended && udev->do_remote_wakeup) {
4285 : 0 : ret = hub_set_port_link_state(hub, port_dev->portnum,
4286 : : USB_SS_PORT_LS_U0);
4287 [ # # ]: 0 : if (!ret) {
4288 : 0 : msleep(USB_RESUME_TIMEOUT);
4289 : 0 : ret = usb_disable_remote_wakeup(udev);
4290 : : }
4291 [ # # ]: 0 : if (ret)
4292 : 0 : dev_warn(&udev->dev,
4293 : : "Port disable: can't disable remote wake\n");
4294 : 0 : udev->do_remote_wakeup = 0;
4295 : : }
4296 : 0 : }
4297 : :
4298 : : #else /* CONFIG_PM */
4299 : :
4300 : : #define hub_suspend NULL
4301 : : #define hub_resume NULL
4302 : : #define hub_reset_resume NULL
4303 : :
4304 : : static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub,
4305 : : struct usb_port *port_dev) { }
4306 : :
4307 : : int usb_disable_lpm(struct usb_device *udev)
4308 : : {
4309 : : return 0;
4310 : : }
4311 : : EXPORT_SYMBOL_GPL(usb_disable_lpm);
4312 : :
4313 : : void usb_enable_lpm(struct usb_device *udev) { }
4314 : : EXPORT_SYMBOL_GPL(usb_enable_lpm);
4315 : :
4316 : : int usb_unlocked_disable_lpm(struct usb_device *udev)
4317 : : {
4318 : : return 0;
4319 : : }
4320 : : EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
4321 : :
4322 : : void usb_unlocked_enable_lpm(struct usb_device *udev) { }
4323 : : EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
4324 : :
4325 : : int usb_disable_ltm(struct usb_device *udev)
4326 : : {
4327 : : return 0;
4328 : : }
4329 : : EXPORT_SYMBOL_GPL(usb_disable_ltm);
4330 : :
4331 : : void usb_enable_ltm(struct usb_device *udev) { }
4332 : : EXPORT_SYMBOL_GPL(usb_enable_ltm);
4333 : :
4334 : : static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
4335 : : u16 portstatus, u16 portchange)
4336 : : {
4337 : : return 0;
4338 : : }
4339 : :
4340 : : #endif /* CONFIG_PM */
4341 : :
4342 : : /*
4343 : : * USB-3 does not have a similar link state as USB-2 that will avoid negotiating
4344 : : * a connection with a plugged-in cable but will signal the host when the cable
4345 : : * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices
4346 : : */
4347 : 0 : static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
4348 : : {
4349 : 0 : struct usb_port *port_dev = hub->ports[port1 - 1];
4350 : 0 : struct usb_device *hdev = hub->hdev;
4351 : : int ret = 0;
4352 : :
4353 [ # # ]: 0 : if (!hub->error) {
4354 [ # # ]: 0 : if (hub_is_superspeed(hub->hdev)) {
4355 : 0 : hub_usb3_port_prepare_disable(hub, port_dev);
4356 : 0 : ret = hub_set_port_link_state(hub, port_dev->portnum,
4357 : : USB_SS_PORT_LS_U3);
4358 : : } else {
4359 : 0 : ret = usb_clear_port_feature(hdev, port1,
4360 : : USB_PORT_FEAT_ENABLE);
4361 : : }
4362 : : }
4363 [ # # # # ]: 0 : if (port_dev->child && set_state)
4364 : 0 : usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED);
4365 [ # # ]: 0 : if (ret && ret != -ENODEV)
4366 : 0 : dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret);
4367 : 0 : return ret;
4368 : : }
4369 : :
4370 : : /*
4371 : : * usb_port_disable - disable a usb device's upstream port
4372 : : * @udev: device to disable
4373 : : * Context: @udev locked, must be able to sleep.
4374 : : *
4375 : : * Disables a USB device that isn't in active use.
4376 : : */
4377 : 0 : int usb_port_disable(struct usb_device *udev)
4378 : : {
4379 : 0 : struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
4380 : :
4381 : 0 : return hub_port_disable(hub, udev->portnum, 0);
4382 : : }
4383 : :
4384 : : /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
4385 : : *
4386 : : * Between connect detection and reset signaling there must be a delay
4387 : : * of 100ms at least for debounce and power-settling. The corresponding
4388 : : * timer shall restart whenever the downstream port detects a disconnect.
4389 : : *
4390 : : * Apparently there are some bluetooth and irda-dongles and a number of
4391 : : * low-speed devices for which this debounce period may last over a second.
4392 : : * Not covered by the spec - but easy to deal with.
4393 : : *
4394 : : * This implementation uses a 1500ms total debounce timeout; if the
4395 : : * connection isn't stable by then it returns -ETIMEDOUT. It checks
4396 : : * every 25ms for transient disconnects. When the port status has been
4397 : : * unchanged for 100ms it returns the port status.
4398 : : */
4399 : 0 : int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected)
4400 : : {
4401 : : int ret;
4402 : : u16 portchange, portstatus;
4403 : : unsigned connection = 0xffff;
4404 : : int total_time, stable_time = 0;
4405 : : struct usb_port *port_dev = hub->ports[port1 - 1];
4406 : :
4407 : 0 : for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
4408 : : ret = hub_port_status(hub, port1, &portstatus, &portchange);
4409 [ # # ]: 0 : if (ret < 0)
4410 : 0 : return ret;
4411 : :
4412 [ # # # # ]: 0 : if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
4413 : 0 : (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
4414 [ # # ]: 0 : if (!must_be_connected ||
4415 : 0 : (connection == USB_PORT_STAT_CONNECTION))
4416 : 0 : stable_time += HUB_DEBOUNCE_STEP;
4417 [ # # ]: 0 : if (stable_time >= HUB_DEBOUNCE_STABLE)
4418 : : break;
4419 : : } else {
4420 : : stable_time = 0;
4421 : 0 : connection = portstatus & USB_PORT_STAT_CONNECTION;
4422 : : }
4423 : :
4424 [ # # ]: 0 : if (portchange & USB_PORT_STAT_C_CONNECTION) {
4425 : 0 : usb_clear_port_feature(hub->hdev, port1,
4426 : : USB_PORT_FEAT_C_CONNECTION);
4427 : : }
4428 : :
4429 [ # # ]: 0 : if (total_time >= HUB_DEBOUNCE_TIMEOUT)
4430 : : break;
4431 : 0 : msleep(HUB_DEBOUNCE_STEP);
4432 : 0 : }
4433 : :
4434 : : dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n",
4435 : : total_time, stable_time, portstatus);
4436 : :
4437 [ # # ]: 0 : if (stable_time < HUB_DEBOUNCE_STABLE)
4438 : : return -ETIMEDOUT;
4439 : 0 : return portstatus;
4440 : : }
4441 : :
4442 : 828 : void usb_ep0_reinit(struct usb_device *udev)
4443 : : {
4444 : 828 : usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
4445 : 828 : usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
4446 : 828 : usb_enable_endpoint(udev, &udev->ep0, true);
4447 : 828 : }
4448 : : EXPORT_SYMBOL_GPL(usb_ep0_reinit);
4449 : :
4450 : : #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
4451 : : #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
4452 : :
4453 : 828 : static int hub_set_address(struct usb_device *udev, int devnum)
4454 : : {
4455 : : int retval;
4456 : 828 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
4457 : :
4458 : : /*
4459 : : * The host controller will choose the device address,
4460 : : * instead of the core having chosen it earlier
4461 : : */
4462 [ + - + - ]: 828 : if (!hcd->driver->address_device && devnum <= 1)
4463 : : return -EINVAL;
4464 [ + - ]: 828 : if (udev->state == USB_STATE_ADDRESS)
4465 : : return 0;
4466 [ + - ]: 828 : if (udev->state != USB_STATE_DEFAULT)
4467 : : return -EINVAL;
4468 [ - + ]: 828 : if (hcd->driver->address_device)
4469 : 0 : retval = hcd->driver->address_device(hcd, udev);
4470 : : else
4471 : 828 : retval = usb_control_msg(udev, usb_sndaddr0pipe(),
4472 : : USB_REQ_SET_ADDRESS, 0, devnum, 0,
4473 : : NULL, 0, USB_CTRL_SET_TIMEOUT);
4474 [ + - ]: 828 : if (retval == 0) {
4475 : : update_devnum(udev, devnum);
4476 : : /* Device now using proper address. */
4477 : 828 : usb_set_device_state(udev, USB_STATE_ADDRESS);
4478 : 828 : usb_ep0_reinit(udev);
4479 : : }
4480 : 828 : return retval;
4481 : : }
4482 : :
4483 : : /*
4484 : : * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM
4485 : : * when they're plugged into a USB 2.0 port, but they don't work when LPM is
4486 : : * enabled.
4487 : : *
4488 : : * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the
4489 : : * device says it supports the new USB 2.0 Link PM errata by setting the BESL
4490 : : * support bit in the BOS descriptor.
4491 : : */
4492 : 828 : static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev)
4493 : : {
4494 : 828 : struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
4495 : : int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN;
4496 : :
4497 [ - + # # ]: 828 : if (!udev->usb2_hw_lpm_capable || !udev->bos)
4498 : 828 : return;
4499 : :
4500 [ # # ]: 0 : if (hub)
4501 : 0 : connect_type = hub->ports[udev->portnum - 1]->connect_type;
4502 : :
4503 [ # # # # ]: 0 : if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) ||
4504 : : connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
4505 : 0 : udev->usb2_hw_lpm_allowed = 1;
4506 : 0 : usb_enable_usb2_hardware_lpm(udev);
4507 : : }
4508 : : }
4509 : :
4510 : 828 : static int hub_enable_device(struct usb_device *udev)
4511 : : {
4512 : 828 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
4513 : :
4514 [ - + ]: 828 : if (!hcd->driver->enable_device)
4515 : : return 0;
4516 [ # # ]: 0 : if (udev->state == USB_STATE_ADDRESS)
4517 : : return 0;
4518 [ # # ]: 0 : if (udev->state != USB_STATE_DEFAULT)
4519 : : return -EINVAL;
4520 : :
4521 : 0 : return hcd->driver->enable_device(hcd, udev);
4522 : : }
4523 : :
4524 : : /* Reset device, (re)assign address, get device descriptor.
4525 : : * Device connection must be stable, no more debouncing needed.
4526 : : * Returns device in USB_STATE_ADDRESS, except on error.
4527 : : *
4528 : : * If this is called for an already-existing device (as part of
4529 : : * usb_reset_and_verify_device), the caller must own the device lock and
4530 : : * the port lock. For a newly detected device that is not accessible
4531 : : * through any global pointers, it's not necessary to lock the device,
4532 : : * but it is still necessary to lock the port.
4533 : : */
4534 : : static int
4535 : 828 : hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
4536 : : int retry_counter)
4537 : : {
4538 : 828 : struct usb_device *hdev = hub->hdev;
4539 : 828 : struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
4540 : 828 : struct usb_port *port_dev = hub->ports[port1 - 1];
4541 : : int retries, operations, retval, i;
4542 : : unsigned delay = HUB_SHORT_RESET_TIME;
4543 : 828 : enum usb_device_speed oldspeed = udev->speed;
4544 : : const char *speed;
4545 : 828 : int devnum = udev->devnum;
4546 : : const char *driver_name;
4547 : :
4548 : : /* root hub ports have a slightly longer reset period
4549 : : * (from USB 2.0 spec, section 7.1.7.5)
4550 : : */
4551 [ + + ]: 828 : if (!hdev->parent) {
4552 : : delay = HUB_ROOT_RESET_TIME;
4553 [ + - ]: 207 : if (port1 == hdev->bus->otg_port)
4554 : 207 : hdev->bus->b_hnp_enable = 0;
4555 : : }
4556 : :
4557 : : /* Some low speed devices have problems with the quick delay, so */
4558 : : /* be a bit pessimistic with those devices. RHbug #23670 */
4559 [ - + ]: 828 : if (oldspeed == USB_SPEED_LOW)
4560 : : delay = HUB_LONG_RESET_TIME;
4561 : :
4562 : 828 : mutex_lock(hcd->address0_mutex);
4563 : :
4564 : : /* Reset the device; full speed may morph to high speed */
4565 : : /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
4566 : 828 : retval = hub_port_reset(hub, port1, udev, delay, false);
4567 [ + - ]: 828 : if (retval < 0) /* error or disconnect */
4568 : : goto fail;
4569 : : /* success, speed is known */
4570 : :
4571 : : retval = -ENODEV;
4572 : :
4573 : : /* Don't allow speed changes at reset, except usb 3.0 to faster */
4574 [ - + # # : 828 : if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed &&
# # ]
4575 [ # # ]: 0 : !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) {
4576 : : dev_dbg(&udev->dev, "device reset changed speed!\n");
4577 : : goto fail;
4578 : : }
4579 : 828 : oldspeed = udev->speed;
4580 : :
4581 : : /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
4582 : : * it's fixed size except for full speed devices.
4583 : : * For Wireless USB devices, ep0 max packet is always 512 (tho
4584 : : * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
4585 : : */
4586 [ - + - + : 828 : switch (udev->speed) {
- ]
4587 : : case USB_SPEED_SUPER_PLUS:
4588 : : case USB_SPEED_SUPER:
4589 : : case USB_SPEED_WIRELESS: /* fixed at 512 */
4590 : 0 : udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
4591 : 0 : break;
4592 : : case USB_SPEED_HIGH: /* fixed at 64 */
4593 : 414 : udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
4594 : 414 : break;
4595 : : case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
4596 : : /* to determine the ep0 maxpacket size, try to read
4597 : : * the device descriptor to get bMaxPacketSize0 and
4598 : : * then correct our initial guess.
4599 : : */
4600 : 0 : udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
4601 : 0 : break;
4602 : : case USB_SPEED_LOW: /* fixed at 8 */
4603 : 414 : udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
4604 : 414 : break;
4605 : : default:
4606 : : goto fail;
4607 : : }
4608 : :
4609 [ + - ]: 828 : if (udev->speed == USB_SPEED_WIRELESS)
4610 : : speed = "variable speed Wireless";
4611 : : else
4612 : 828 : speed = usb_speed_string(udev->speed);
4613 : :
4614 : : /*
4615 : : * The controller driver may be NULL if the controller device
4616 : : * is the middle device between platform device and roothub.
4617 : : * This middle device may not need a device driver due to
4618 : : * all hardware control can be at platform device driver, this
4619 : : * platform device is usually a dual-role USB controller device.
4620 : : */
4621 [ + - ]: 828 : if (udev->bus->controller->driver)
4622 : 828 : driver_name = udev->bus->controller->driver->name;
4623 : : else
4624 : 0 : driver_name = udev->bus->sysdev->driver->name;
4625 : :
4626 [ + - ]: 828 : if (udev->speed < USB_SPEED_SUPER)
4627 [ + - ]: 828 : dev_info(&udev->dev,
4628 : : "%s %s USB device number %d using %s\n",
4629 : : (udev->config) ? "reset" : "new", speed,
4630 : : devnum, driver_name);
4631 : :
4632 : : /* Set up TT records, if needed */
4633 [ - + ]: 828 : if (hdev->tt) {
4634 : 0 : udev->tt = hdev->tt;
4635 : 0 : udev->ttport = hdev->ttport;
4636 [ + + ]: 828 : } else if (udev->speed != USB_SPEED_HIGH
4637 [ + - ]: 414 : && hdev->speed == USB_SPEED_HIGH) {
4638 [ - + ]: 414 : if (!hub->tt.hub) {
4639 : 0 : dev_err(&udev->dev, "parent hub has no TT\n");
4640 : : retval = -EINVAL;
4641 : 0 : goto fail;
4642 : : }
4643 : 414 : udev->tt = &hub->tt;
4644 : 414 : udev->ttport = port1;
4645 : : }
4646 : :
4647 : : /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
4648 : : * Because device hardware and firmware is sometimes buggy in
4649 : : * this area, and this is how Linux has done it for ages.
4650 : : * Change it cautiously.
4651 : : *
4652 : : * NOTE: If use_new_scheme() is true we will start by issuing
4653 : : * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
4654 : : * so it may help with some non-standards-compliant devices.
4655 : : * Otherwise we start with SET_ADDRESS and then try to read the
4656 : : * first 8 bytes of the device descriptor to get the ep0 maxpacket
4657 : : * value.
4658 : : */
4659 [ + - ]: 0 : for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) {
4660 : : bool did_new_scheme = false;
4661 : :
4662 [ + - ]: 828 : if (use_new_scheme(udev, retry_counter, port_dev)) {
4663 : : struct usb_device_descriptor *buf;
4664 : : int r = 0;
4665 : :
4666 : : did_new_scheme = true;
4667 : 828 : retval = hub_enable_device(udev);
4668 [ - + ]: 828 : if (retval < 0) {
4669 : 0 : dev_err(&udev->dev,
4670 : : "hub failed to enable device, error %d\n",
4671 : : retval);
4672 : 0 : goto fail;
4673 : : }
4674 : :
4675 : : #define GET_DESCRIPTOR_BUFSIZE 64
4676 : : buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
4677 [ + - ]: 828 : if (!buf) {
4678 : : retval = -ENOMEM;
4679 : 0 : continue;
4680 : : }
4681 : :
4682 : : /* Retry on all errors; some devices are flakey.
4683 : : * 255 is for WUSB devices, we actually need to use
4684 : : * 512 (WUSB1.0[4.8.1]).
4685 : : */
4686 [ + - ]: 0 : for (operations = 0; operations < 3; ++operations) {
4687 : 828 : buf->bMaxPacketSize0 = 0;
4688 : 828 : r = usb_control_msg(udev, usb_rcvaddr0pipe(),
4689 : : USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
4690 : : USB_DT_DEVICE << 8, 0,
4691 : : buf, GET_DESCRIPTOR_BUFSIZE,
4692 : : initial_descriptor_timeout);
4693 [ + - ]: 828 : switch (buf->bMaxPacketSize0) {
4694 : : case 8: case 16: case 32: case 64: case 255:
4695 [ - + ]: 828 : if (buf->bDescriptorType ==
4696 : : USB_DT_DEVICE) {
4697 : : r = 0;
4698 : : break;
4699 : : }
4700 : : /* FALL THROUGH */
4701 : : default:
4702 [ # # ]: 0 : if (r == 0)
4703 : : r = -EPROTO;
4704 : : break;
4705 : : }
4706 : : /*
4707 : : * Some devices time out if they are powered on
4708 : : * when already connected. They need a second
4709 : : * reset. But only on the first attempt,
4710 : : * lest we get into a time out/reset loop
4711 : : */
4712 [ - + # # ]: 828 : if (r == 0 || (r == -ETIMEDOUT &&
4713 [ # # ]: 0 : retries == 0 &&
4714 : 0 : udev->speed > USB_SPEED_FULL))
4715 : : break;
4716 : : }
4717 : 828 : udev->descriptor.bMaxPacketSize0 =
4718 : 828 : buf->bMaxPacketSize0;
4719 : 828 : kfree(buf);
4720 : :
4721 : 828 : retval = hub_port_reset(hub, port1, udev, delay, false);
4722 [ + - ]: 828 : if (retval < 0) /* error or disconnect */
4723 : : goto fail;
4724 [ + - ]: 828 : if (oldspeed != udev->speed) {
4725 : : dev_dbg(&udev->dev,
4726 : : "device reset changed speed!\n");
4727 : : retval = -ENODEV;
4728 : : goto fail;
4729 : : }
4730 [ - + ]: 828 : if (r) {
4731 [ # # ]: 0 : if (r != -ENODEV)
4732 : 0 : dev_err(&udev->dev, "device descriptor read/64, error %d\n",
4733 : : r);
4734 : : retval = -EMSGSIZE;
4735 : 0 : continue;
4736 : : }
4737 : : #undef GET_DESCRIPTOR_BUFSIZE
4738 : : }
4739 : :
4740 : : /*
4741 : : * If device is WUSB, we already assigned an
4742 : : * unauthorized address in the Connect Ack sequence;
4743 : : * authorization will assign the final address.
4744 : : */
4745 [ + - ]: 828 : if (udev->wusb == 0) {
4746 [ + - ]: 0 : for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) {
4747 : 828 : retval = hub_set_address(udev, devnum);
4748 [ - + ]: 828 : if (retval >= 0)
4749 : : break;
4750 : 0 : msleep(200);
4751 : : }
4752 [ - + ]: 828 : if (retval < 0) {
4753 [ # # ]: 0 : if (retval != -ENODEV)
4754 : 0 : dev_err(&udev->dev, "device not accepting address %d, error %d\n",
4755 : : devnum, retval);
4756 : : goto fail;
4757 : : }
4758 [ - + ]: 828 : if (udev->speed >= USB_SPEED_SUPER) {
4759 : 0 : devnum = udev->devnum;
4760 [ # # # # : 0 : dev_info(&udev->dev,
# # # # ]
4761 : : "%s SuperSpeed%s%s USB device number %d using %s\n",
4762 : : (udev->config) ? "reset" : "new",
4763 : : (udev->speed == USB_SPEED_SUPER_PLUS) ?
4764 : : "Plus Gen 2" : " Gen 1",
4765 : : (udev->rx_lanes == 2 && udev->tx_lanes == 2) ?
4766 : : "x2" : "",
4767 : : devnum, driver_name);
4768 : : }
4769 : :
4770 : : /* cope with hardware quirkiness:
4771 : : * - let SET_ADDRESS settle, some device hardware wants it
4772 : : * - read ep0 maxpacket even for high and low speed,
4773 : : */
4774 : 828 : msleep(10);
4775 : : /* use_new_scheme() checks the speed which may have
4776 : : * changed since the initial look so we cache the result
4777 : : * in did_new_scheme
4778 : : */
4779 [ - + ]: 828 : if (did_new_scheme)
4780 : : break;
4781 : : }
4782 : :
4783 : 0 : retval = usb_get_device_descriptor(udev, 8);
4784 [ # # ]: 0 : if (retval < 8) {
4785 [ # # ]: 0 : if (retval != -ENODEV)
4786 : 0 : dev_err(&udev->dev,
4787 : : "device descriptor read/8, error %d\n",
4788 : : retval);
4789 [ # # ]: 0 : if (retval >= 0)
4790 : : retval = -EMSGSIZE;
4791 : : } else {
4792 : : u32 delay;
4793 : :
4794 : : retval = 0;
4795 : :
4796 : 0 : delay = udev->parent->hub_delay;
4797 : 0 : udev->hub_delay = min_t(u32, delay,
4798 : : USB_TP_TRANSMISSION_DELAY_MAX);
4799 : 0 : retval = usb_set_isoch_delay(udev);
4800 [ # # ]: 0 : if (retval) {
4801 : : dev_dbg(&udev->dev,
4802 : : "Failed set isoch delay, error %d\n",
4803 : : retval);
4804 : : retval = 0;
4805 : : }
4806 : : break;
4807 : : }
4808 : : }
4809 [ + - ]: 828 : if (retval)
4810 : : goto fail;
4811 : :
4812 : : /*
4813 : : * Some superspeed devices have finished the link training process
4814 : : * and attached to a superspeed hub port, but the device descriptor
4815 : : * got from those devices show they aren't superspeed devices. Warm
4816 : : * reset the port attached by the devices can fix them.
4817 : : */
4818 [ - + # # ]: 828 : if ((udev->speed >= USB_SPEED_SUPER) &&
4819 : 0 : (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
4820 : 0 : dev_err(&udev->dev, "got a wrong device descriptor, "
4821 : : "warm reset device\n");
4822 : 0 : hub_port_reset(hub, port1, udev,
4823 : : HUB_BH_RESET_TIME, true);
4824 : : retval = -EINVAL;
4825 : 0 : goto fail;
4826 : : }
4827 : :
4828 [ + - + - ]: 828 : if (udev->descriptor.bMaxPacketSize0 == 0xff ||
4829 : : udev->speed >= USB_SPEED_SUPER)
4830 : : i = 512;
4831 : : else
4832 : 828 : i = udev->descriptor.bMaxPacketSize0;
4833 [ - + ]: 828 : if (usb_endpoint_maxp(&udev->ep0.desc) != i) {
4834 [ # # # # ]: 0 : if (udev->speed == USB_SPEED_LOW ||
4835 [ # # ]: 0 : !(i == 8 || i == 16 || i == 32 || i == 64)) {
4836 : 0 : dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
4837 : : retval = -EMSGSIZE;
4838 : 0 : goto fail;
4839 : : }
4840 [ # # ]: 0 : if (udev->speed == USB_SPEED_FULL)
4841 : : dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
4842 : : else
4843 : 0 : dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
4844 : 0 : udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
4845 : 0 : usb_ep0_reinit(udev);
4846 : : }
4847 : :
4848 : 828 : retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
4849 [ - + ]: 828 : if (retval < (signed)sizeof(udev->descriptor)) {
4850 [ # # ]: 0 : if (retval != -ENODEV)
4851 : 0 : dev_err(&udev->dev, "device descriptor read/all, error %d\n",
4852 : : retval);
4853 [ # # ]: 0 : if (retval >= 0)
4854 : : retval = -ENOMSG;
4855 : : goto fail;
4856 : : }
4857 : :
4858 : 828 : usb_detect_quirks(udev);
4859 : :
4860 [ + - - + ]: 828 : if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
4861 : 0 : retval = usb_get_bos_descriptor(udev);
4862 [ # # ]: 0 : if (!retval) {
4863 : 0 : udev->lpm_capable = usb_device_supports_lpm(udev);
4864 : 0 : usb_set_lpm_parameters(udev);
4865 : : }
4866 : : }
4867 : :
4868 : : retval = 0;
4869 : : /* notify HCD that we have a device connected and addressed */
4870 [ - + ]: 828 : if (hcd->driver->update_device)
4871 : 0 : hcd->driver->update_device(hcd, udev);
4872 : 828 : hub_set_initial_usb2_lpm_policy(udev);
4873 : : fail:
4874 [ - + ]: 828 : if (retval) {
4875 : 0 : hub_port_disable(hub, port1, 0);
4876 : : update_devnum(udev, devnum); /* for disconnect processing */
4877 : : }
4878 : 828 : mutex_unlock(hcd->address0_mutex);
4879 : 828 : return retval;
4880 : : }
4881 : :
4882 : : static void
4883 : 0 : check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1)
4884 : : {
4885 : : struct usb_qualifier_descriptor *qual;
4886 : : int status;
4887 : :
4888 [ # # ]: 0 : if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER)
4889 : : return;
4890 : :
4891 : : qual = kmalloc(sizeof *qual, GFP_KERNEL);
4892 [ # # ]: 0 : if (qual == NULL)
4893 : : return;
4894 : :
4895 : 0 : status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0,
4896 : : qual, sizeof *qual);
4897 [ # # ]: 0 : if (status == sizeof *qual) {
4898 : 0 : dev_info(&udev->dev, "not running at top speed; "
4899 : : "connect to a high speed hub\n");
4900 : : /* hub LEDs are probably harder to miss than syslog */
4901 [ # # ]: 0 : if (hub->has_indicators) {
4902 : 0 : hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
4903 : 0 : queue_delayed_work(system_power_efficient_wq,
4904 : : &hub->leds, 0);
4905 : : }
4906 : : }
4907 : 0 : kfree(qual);
4908 : : }
4909 : :
4910 : : static unsigned
4911 : 828 : hub_power_remaining(struct usb_hub *hub)
4912 : : {
4913 : 828 : struct usb_device *hdev = hub->hdev;
4914 : : int remaining;
4915 : : int port1;
4916 : :
4917 [ - + ]: 828 : if (!hub->limited_power)
4918 : : return 0;
4919 : :
4920 : 0 : remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
4921 [ # # ]: 0 : for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
4922 : 0 : struct usb_port *port_dev = hub->ports[port1 - 1];
4923 : 0 : struct usb_device *udev = port_dev->child;
4924 : : unsigned unit_load;
4925 : : int delta;
4926 : :
4927 [ # # ]: 0 : if (!udev)
4928 : 0 : continue;
4929 [ # # ]: 0 : if (hub_is_superspeed(udev))
4930 : : unit_load = 150;
4931 : : else
4932 : : unit_load = 100;
4933 : :
4934 : : /*
4935 : : * Unconfigured devices may not use more than one unit load,
4936 : : * or 8mA for OTG ports
4937 : : */
4938 [ # # ]: 0 : if (udev->actconfig)
4939 : 0 : delta = usb_get_max_power(udev, udev->actconfig);
4940 [ # # # # ]: 0 : else if (port1 != udev->bus->otg_port || hdev->parent)
4941 : 0 : delta = unit_load;
4942 : : else
4943 : : delta = 8;
4944 [ # # ]: 0 : if (delta > hub->mA_per_port)
4945 : 0 : dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n",
4946 : : delta, hub->mA_per_port);
4947 : 0 : remaining -= delta;
4948 : : }
4949 [ # # ]: 0 : if (remaining < 0) {
4950 : 0 : dev_warn(hub->intfdev, "%dmA over power budget!\n",
4951 : : -remaining);
4952 : : remaining = 0;
4953 : : }
4954 : 0 : return remaining;
4955 : : }
4956 : :
4957 : 828 : static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
4958 : : u16 portchange)
4959 : : {
4960 : : int status = -ENODEV;
4961 : : int i;
4962 : : unsigned unit_load;
4963 : 828 : struct usb_device *hdev = hub->hdev;
4964 : 828 : struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
4965 : 828 : struct usb_port *port_dev = hub->ports[port1 - 1];
4966 : 828 : struct usb_device *udev = port_dev->child;
4967 : : static int unreliable_port = -1;
4968 : :
4969 : : /* Disconnect any existing devices under this port */
4970 [ - + ]: 828 : if (udev) {
4971 [ # # # # ]: 0 : if (hcd->usb_phy && !hdev->parent)
4972 : 0 : usb_phy_notify_disconnect(hcd->usb_phy, udev->speed);
4973 : 0 : usb_disconnect(&port_dev->child);
4974 : : }
4975 : :
4976 : : /* We can forget about a "removed" device when there's a physical
4977 : : * disconnect or the connect status changes.
4978 : : */
4979 [ + - - + ]: 1656 : if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
4980 : 828 : (portchange & USB_PORT_STAT_C_CONNECTION))
4981 : 0 : clear_bit(port1, hub->removed_bits);
4982 : :
4983 [ - + ]: 828 : if (portchange & (USB_PORT_STAT_C_CONNECTION |
4984 : : USB_PORT_STAT_C_ENABLE)) {
4985 : : status = hub_port_debounce_be_stable(hub, port1);
4986 [ # # ]: 0 : if (status < 0) {
4987 [ # # # # ]: 0 : if (status != -ENODEV &&
4988 [ # # ]: 0 : port1 != unreliable_port &&
4989 : 0 : printk_ratelimit())
4990 : 0 : dev_err(&port_dev->dev, "connect-debounce failed\n");
4991 : 0 : portstatus &= ~USB_PORT_STAT_CONNECTION;
4992 : 0 : unreliable_port = port1;
4993 : : } else {
4994 : 0 : portstatus = status;
4995 : : }
4996 : : }
4997 : :
4998 : : /* Return now if debouncing failed or nothing is connected or
4999 : : * the device was "removed".
5000 : : */
5001 [ + - - + ]: 1656 : if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
5002 : 828 : test_bit(port1, hub->removed_bits)) {
5003 : :
5004 : : /*
5005 : : * maybe switch power back on (e.g. root hub was reset)
5006 : : * but only if the port isn't owned by someone else.
5007 : : */
5008 [ # # ]: 0 : if (hub_is_port_power_switchable(hub)
5009 [ # # ]: 0 : && !port_is_power_on(hub, portstatus)
5010 [ # # ]: 0 : && !port_dev->port_owner)
5011 : 0 : set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
5012 : :
5013 [ # # ]: 0 : if (portstatus & USB_PORT_STAT_ENABLE)
5014 : : goto done;
5015 : : return;
5016 : : }
5017 [ + - ]: 1656 : if (hub_is_superspeed(hub->hdev))
5018 : : unit_load = 150;
5019 : : else
5020 : : unit_load = 100;
5021 : :
5022 : : status = 0;
5023 [ + - ]: 828 : for (i = 0; i < SET_CONFIG_TRIES; i++) {
5024 : :
5025 : : /* reallocate for each attempt, since references
5026 : : * to the previous one can escape in various ways
5027 : : */
5028 : 828 : udev = usb_alloc_dev(hdev, hdev->bus, port1);
5029 [ - + ]: 828 : if (!udev) {
5030 : 0 : dev_err(&port_dev->dev,
5031 : : "couldn't allocate usb_device\n");
5032 : 0 : goto done;
5033 : : }
5034 : :
5035 : 828 : usb_set_device_state(udev, USB_STATE_POWERED);
5036 : 828 : udev->bus_mA = hub->mA_per_port;
5037 : 828 : udev->level = hdev->level + 1;
5038 : 828 : udev->wusb = hub_is_wusb(hub);
5039 : :
5040 : : /* Devices connected to SuperSpeed hubs are USB 3.0 or later */
5041 [ - + ]: 1656 : if (hub_is_superspeed(hub->hdev))
5042 : 0 : udev->speed = USB_SPEED_SUPER;
5043 : : else
5044 : 828 : udev->speed = USB_SPEED_UNKNOWN;
5045 : :
5046 : 828 : choose_devnum(udev);
5047 [ + - ]: 828 : if (udev->devnum <= 0) {
5048 : : status = -ENOTCONN; /* Don't retry */
5049 : : goto loop;
5050 : : }
5051 : :
5052 : : /* reset (non-USB 3.0 devices) and get descriptor */
5053 : : usb_lock_port(port_dev);
5054 : 828 : status = hub_port_init(hub, udev, port1, i);
5055 : : usb_unlock_port(port_dev);
5056 [ + - ]: 828 : if (status < 0)
5057 : : goto loop;
5058 : :
5059 [ - + ]: 828 : if (udev->quirks & USB_QUIRK_DELAY_INIT)
5060 : 0 : msleep(2000);
5061 : :
5062 : : /* consecutive bus-powered hubs aren't reliable; they can
5063 : : * violate the voltage drop budget. if the new child has
5064 : : * a "powered" LED, users should notice we didn't enable it
5065 : : * (without reading syslog), even without per-port LEDs
5066 : : * on the parent.
5067 : : */
5068 [ + + ]: 828 : if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
5069 [ - + ]: 207 : && udev->bus_mA <= unit_load) {
5070 : : u16 devstat;
5071 : :
5072 : : status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0,
5073 : : &devstat);
5074 [ # # ]: 0 : if (status) {
5075 : : dev_dbg(&udev->dev, "get status %d ?\n", status);
5076 : 0 : goto loop_disable;
5077 : : }
5078 [ # # ]: 0 : if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
5079 : 0 : dev_err(&udev->dev,
5080 : : "can't connect bus-powered hub "
5081 : : "to this port\n");
5082 [ # # ]: 0 : if (hub->has_indicators) {
5083 : 0 : hub->indicator[port1-1] =
5084 : : INDICATOR_AMBER_BLINK;
5085 : 0 : queue_delayed_work(
5086 : : system_power_efficient_wq,
5087 : : &hub->leds, 0);
5088 : : }
5089 : : status = -ENOTCONN; /* Don't retry */
5090 : : goto loop_disable;
5091 : : }
5092 : : }
5093 : :
5094 : : /* check for devices running slower than they could */
5095 [ + + ]: 828 : if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
5096 [ - + ]: 621 : && udev->speed == USB_SPEED_FULL
5097 [ # # ]: 0 : && highspeed_hubs != 0)
5098 : 0 : check_highspeed(hub, udev, port1);
5099 : :
5100 : : /* Store the parent's children[] pointer. At this point
5101 : : * udev becomes globally accessible, although presumably
5102 : : * no one will look at it until hdev is unlocked.
5103 : : */
5104 : : status = 0;
5105 : :
5106 : 828 : mutex_lock(&usb_port_peer_mutex);
5107 : :
5108 : : /* We mustn't add new devices if the parent hub has
5109 : : * been disconnected; we would race with the
5110 : : * recursively_mark_NOTATTACHED() routine.
5111 : : */
5112 : : spin_lock_irq(&device_state_lock);
5113 [ + - ]: 828 : if (hdev->state == USB_STATE_NOTATTACHED)
5114 : : status = -ENOTCONN;
5115 : : else
5116 : 828 : port_dev->child = udev;
5117 : : spin_unlock_irq(&device_state_lock);
5118 : 828 : mutex_unlock(&usb_port_peer_mutex);
5119 : :
5120 : : /* Run it through the hoops (find a driver, etc) */
5121 [ + - ]: 828 : if (!status) {
5122 : 828 : status = usb_new_device(udev);
5123 [ - + ]: 828 : if (status) {
5124 : 0 : mutex_lock(&usb_port_peer_mutex);
5125 : : spin_lock_irq(&device_state_lock);
5126 : 0 : port_dev->child = NULL;
5127 : : spin_unlock_irq(&device_state_lock);
5128 : 0 : mutex_unlock(&usb_port_peer_mutex);
5129 : : } else {
5130 [ - + # # ]: 828 : if (hcd->usb_phy && !hdev->parent)
5131 : 0 : usb_phy_notify_connect(hcd->usb_phy,
5132 : : udev->speed);
5133 : : }
5134 : : }
5135 : :
5136 [ + - ]: 828 : if (status)
5137 : : goto loop_disable;
5138 : :
5139 : 828 : status = hub_power_remaining(hub);
5140 : : if (status)
5141 : : dev_dbg(hub->intfdev, "%dmA power budget left\n", status);
5142 : :
5143 : : return;
5144 : :
5145 : : loop_disable:
5146 : 0 : hub_port_disable(hub, port1, 1);
5147 : : loop:
5148 : 0 : usb_ep0_reinit(udev);
5149 : : release_devnum(udev);
5150 : : hub_free_dev(udev);
5151 : 0 : usb_put_dev(udev);
5152 [ # # ]: 0 : if ((status == -ENOTCONN) || (status == -ENOTSUPP))
5153 : : break;
5154 : :
5155 : : /* When halfway through our retry count, power-cycle the port */
5156 [ # # ]: 0 : if (i == (SET_CONFIG_TRIES / 2) - 1) {
5157 : 0 : dev_info(&port_dev->dev, "attempt power cycle\n");
5158 : 0 : usb_hub_set_port_power(hdev, hub, port1, false);
5159 : 0 : msleep(2 * hub_power_on_good_delay(hub));
5160 : 0 : usb_hub_set_port_power(hdev, hub, port1, true);
5161 : 0 : msleep(hub_power_on_good_delay(hub));
5162 : : }
5163 : : }
5164 [ # # # # ]: 0 : if (hub->hdev->parent ||
5165 [ # # ]: 0 : !hcd->driver->port_handed_over ||
5166 : 0 : !(hcd->driver->port_handed_over)(hcd, port1)) {
5167 [ # # ]: 0 : if (status != -ENOTCONN && status != -ENODEV)
5168 : 0 : dev_err(&port_dev->dev,
5169 : : "unable to enumerate USB device\n");
5170 : : }
5171 : :
5172 : : done:
5173 : 0 : hub_port_disable(hub, port1, 1);
5174 [ # # # # ]: 0 : if (hcd->driver->relinquish_port && !hub->hdev->parent) {
5175 [ # # ]: 0 : if (status != -ENOTCONN && status != -ENODEV)
5176 : 0 : hcd->driver->relinquish_port(hcd, port1);
5177 : : }
5178 : : }
5179 : :
5180 : : /* Handle physical or logical connection change events.
5181 : : * This routine is called when:
5182 : : * a port connection-change occurs;
5183 : : * a port enable-change occurs (often caused by EMI);
5184 : : * usb_reset_and_verify_device() encounters changed descriptors (as from
5185 : : * a firmware download)
5186 : : * caller already locked the hub
5187 : : */
5188 : 828 : static void hub_port_connect_change(struct usb_hub *hub, int port1,
5189 : : u16 portstatus, u16 portchange)
5190 : : __must_hold(&port_dev->status_lock)
5191 : : {
5192 : 828 : struct usb_port *port_dev = hub->ports[port1 - 1];
5193 : 828 : struct usb_device *udev = port_dev->child;
5194 : : int status = -ENODEV;
5195 : :
5196 : : dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus,
5197 : : portchange, portspeed(hub, portstatus));
5198 : :
5199 [ - + ]: 828 : if (hub->has_indicators) {
5200 : : set_port_led(hub, port1, HUB_LED_AUTO);
5201 : 0 : hub->indicator[port1-1] = INDICATOR_AUTO;
5202 : : }
5203 : :
5204 : : #ifdef CONFIG_USB_OTG
5205 : : /* during HNP, don't repeat the debounce */
5206 : : if (hub->hdev->bus->is_b_host)
5207 : : portchange &= ~(USB_PORT_STAT_C_CONNECTION |
5208 : : USB_PORT_STAT_C_ENABLE);
5209 : : #endif
5210 : :
5211 : : /* Try to resuscitate an existing device */
5212 [ + - - + : 828 : if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
# # ]
5213 : 0 : udev->state != USB_STATE_NOTATTACHED) {
5214 [ # # ]: 0 : if (portstatus & USB_PORT_STAT_ENABLE) {
5215 : : status = 0; /* Nothing to do */
5216 : : #ifdef CONFIG_PM
5217 [ # # # # ]: 0 : } else if (udev->state == USB_STATE_SUSPENDED &&
5218 : : udev->persist_enabled) {
5219 : : /* For a suspended device, treat this as a
5220 : : * remote wakeup event.
5221 : : */
5222 : : usb_unlock_port(port_dev);
5223 : 0 : status = usb_remote_wakeup(udev);
5224 : : usb_lock_port(port_dev);
5225 : : #endif
5226 : : } else {
5227 : : /* Don't resuscitate */;
5228 : : }
5229 : : }
5230 : 828 : clear_bit(port1, hub->change_bits);
5231 : :
5232 : : /* successfully revalidated the connection */
5233 [ + - ]: 828 : if (status == 0)
5234 : 828 : return;
5235 : :
5236 : : usb_unlock_port(port_dev);
5237 : 828 : hub_port_connect(hub, port1, portstatus, portchange);
5238 : : usb_lock_port(port_dev);
5239 : : }
5240 : :
5241 : : /* Handle notifying userspace about hub over-current events */
5242 : 0 : static void port_over_current_notify(struct usb_port *port_dev)
5243 : : {
5244 : : char *envp[3];
5245 : : struct device *hub_dev;
5246 : : char *port_dev_path;
5247 : :
5248 : 0 : sysfs_notify(&port_dev->dev.kobj, NULL, "over_current_count");
5249 : :
5250 : 0 : hub_dev = port_dev->dev.parent;
5251 : :
5252 [ # # ]: 0 : if (!hub_dev)
5253 : 0 : return;
5254 : :
5255 : 0 : port_dev_path = kobject_get_path(&port_dev->dev.kobj, GFP_KERNEL);
5256 [ # # ]: 0 : if (!port_dev_path)
5257 : : return;
5258 : :
5259 : 0 : envp[0] = kasprintf(GFP_KERNEL, "OVER_CURRENT_PORT=%s", port_dev_path);
5260 [ # # ]: 0 : if (!envp[0])
5261 : : goto exit_path;
5262 : :
5263 : 0 : envp[1] = kasprintf(GFP_KERNEL, "OVER_CURRENT_COUNT=%u",
5264 : : port_dev->over_current_count);
5265 [ # # ]: 0 : if (!envp[1])
5266 : : goto exit;
5267 : :
5268 : 0 : envp[2] = NULL;
5269 : 0 : kobject_uevent_env(&hub_dev->kobj, KOBJ_CHANGE, envp);
5270 : :
5271 : 0 : kfree(envp[1]);
5272 : : exit:
5273 : 0 : kfree(envp[0]);
5274 : : exit_path:
5275 : 0 : kfree(port_dev_path);
5276 : : }
5277 : :
5278 : 1047 : static void port_event(struct usb_hub *hub, int port1)
5279 : : __must_hold(&port_dev->status_lock)
5280 : : {
5281 : : int connect_change;
5282 : 1047 : struct usb_port *port_dev = hub->ports[port1 - 1];
5283 : 1047 : struct usb_device *udev = port_dev->child;
5284 : 1047 : struct usb_device *hdev = hub->hdev;
5285 : : u16 portstatus, portchange;
5286 : :
5287 : 1047 : connect_change = test_bit(port1, hub->change_bits);
5288 : 1047 : clear_bit(port1, hub->event_bits);
5289 : 1047 : clear_bit(port1, hub->wakeup_bits);
5290 : :
5291 [ + - ]: 1047 : if (hub_port_status(hub, port1, &portstatus, &portchange) < 0)
5292 : 0 : return;
5293 : :
5294 [ - + ]: 1047 : if (portchange & USB_PORT_STAT_C_CONNECTION) {
5295 : 0 : usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
5296 : : connect_change = 1;
5297 : : }
5298 : :
5299 [ + + ]: 1047 : if (portchange & USB_PORT_STAT_C_ENABLE) {
5300 : : if (!connect_change)
5301 : : dev_dbg(&port_dev->dev, "enable change, status %08x\n",
5302 : : portstatus);
5303 : 207 : usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
5304 : :
5305 : : /*
5306 : : * EM interference sometimes causes badly shielded USB devices
5307 : : * to be shutdown by the hub, this hack enables them again.
5308 : : * Works at least with mouse driver.
5309 : : */
5310 [ - + ]: 414 : if (!(portstatus & USB_PORT_STAT_ENABLE)
5311 [ # # ]: 207 : && !connect_change && udev) {
5312 : 0 : dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n");
5313 : : connect_change = 1;
5314 : : }
5315 : : }
5316 : :
5317 [ - + ]: 1047 : if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
5318 : 0 : u16 status = 0, unused;
5319 : 0 : port_dev->over_current_count++;
5320 : 0 : port_over_current_notify(port_dev);
5321 : :
5322 : 0 : dev_notice(&port_dev->dev, "over-current change #%u\n",
5323 : : port_dev->over_current_count);
5324 : 0 : usb_clear_port_feature(hdev, port1,
5325 : : USB_PORT_FEAT_C_OVER_CURRENT);
5326 : 0 : msleep(100); /* Cool down */
5327 : 0 : hub_power_on(hub, true);
5328 : : hub_port_status(hub, port1, &status, &unused);
5329 [ # # ]: 0 : if (status & USB_PORT_STAT_OVERCURRENT)
5330 : 0 : dev_err(&port_dev->dev, "over-current condition\n");
5331 : : }
5332 : :
5333 [ - + ]: 1047 : if (portchange & USB_PORT_STAT_C_RESET) {
5334 : : dev_dbg(&port_dev->dev, "reset change\n");
5335 : 0 : usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET);
5336 : : }
5337 [ - + ]: 1047 : if ((portchange & USB_PORT_STAT_C_BH_RESET)
5338 [ # # ]: 0 : && hub_is_superspeed(hdev)) {
5339 : : dev_dbg(&port_dev->dev, "warm reset change\n");
5340 : 0 : usb_clear_port_feature(hdev, port1,
5341 : : USB_PORT_FEAT_C_BH_PORT_RESET);
5342 : : }
5343 [ - + ]: 1047 : if (portchange & USB_PORT_STAT_C_LINK_STATE) {
5344 : : dev_dbg(&port_dev->dev, "link state change\n");
5345 : 0 : usb_clear_port_feature(hdev, port1,
5346 : : USB_PORT_FEAT_C_PORT_LINK_STATE);
5347 : : }
5348 [ - + ]: 1047 : if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
5349 : 0 : dev_warn(&port_dev->dev, "config error\n");
5350 : 0 : usb_clear_port_feature(hdev, port1,
5351 : : USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
5352 : : }
5353 : :
5354 : : /* skip port actions that require the port to be powered on */
5355 [ + - ]: 1047 : if (!pm_runtime_active(&port_dev->dev))
5356 : : return;
5357 : :
5358 [ - + ]: 1047 : if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange))
5359 : : connect_change = 1;
5360 : :
5361 : : /*
5362 : : * Warm reset a USB3 protocol port if it's in
5363 : : * SS.Inactive state.
5364 : : */
5365 [ - + ]: 1047 : if (hub_port_warm_reset_required(hub, port1, portstatus)) {
5366 : : dev_dbg(&port_dev->dev, "do warm reset\n");
5367 [ # # # # ]: 0 : if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION)
5368 [ # # ]: 0 : || udev->state == USB_STATE_NOTATTACHED) {
5369 [ # # ]: 0 : if (hub_port_reset(hub, port1, NULL,
5370 : : HUB_BH_RESET_TIME, true) < 0)
5371 : 0 : hub_port_disable(hub, port1, 1);
5372 : : } else {
5373 : : usb_unlock_port(port_dev);
5374 : : usb_lock_device(udev);
5375 : 0 : usb_reset_device(udev);
5376 : : usb_unlock_device(udev);
5377 : : usb_lock_port(port_dev);
5378 : : connect_change = 0;
5379 : : }
5380 : : }
5381 : :
5382 [ + + ]: 1047 : if (connect_change)
5383 : 828 : hub_port_connect_change(hub, port1, portstatus, portchange);
5384 : : }
5385 : :
5386 : 633 : static void hub_event(struct work_struct *work)
5387 : : {
5388 : : struct usb_device *hdev;
5389 : : struct usb_interface *intf;
5390 : : struct usb_hub *hub;
5391 : : struct device *hub_dev;
5392 : : u16 hubstatus;
5393 : : u16 hubchange;
5394 : : int i, ret;
5395 : :
5396 : 633 : hub = container_of(work, struct usb_hub, events);
5397 : 633 : hdev = hub->hdev;
5398 : 633 : hub_dev = hub->intfdev;
5399 : 633 : intf = to_usb_interface(hub_dev);
5400 : :
5401 : : dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
5402 : : hdev->state, hdev->maxchild,
5403 : : /* NOTE: expects max 15 ports... */
5404 : : (u16) hub->change_bits[0],
5405 : : (u16) hub->event_bits[0]);
5406 : :
5407 : : /* Lock the device, then check to see if we were
5408 : : * disconnected while waiting for the lock to succeed. */
5409 : : usb_lock_device(hdev);
5410 [ + - ]: 633 : if (unlikely(hub->disconnected))
5411 : : goto out_hdev_lock;
5412 : :
5413 : : /* If the hub has died, clean up after it */
5414 [ - + ]: 633 : if (hdev->state == USB_STATE_NOTATTACHED) {
5415 : 0 : hub->error = -ENODEV;
5416 : 0 : hub_quiesce(hub, HUB_DISCONNECT);
5417 : 0 : goto out_hdev_lock;
5418 : : }
5419 : :
5420 : : /* Autoresume */
5421 : 633 : ret = usb_autopm_get_interface(intf);
5422 [ + - ]: 633 : if (ret) {
5423 : : dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
5424 : : goto out_hdev_lock;
5425 : : }
5426 : :
5427 : : /* If this is an inactive hub, do nothing */
5428 [ + - ]: 633 : if (hub->quiescing)
5429 : : goto out_autopm;
5430 : :
5431 [ - + ]: 633 : if (hub->error) {
5432 : : dev_dbg(hub_dev, "resetting for error %d\n", hub->error);
5433 : :
5434 : 0 : ret = usb_reset_device(hdev);
5435 [ # # ]: 0 : if (ret) {
5436 : : dev_dbg(hub_dev, "error resetting hub: %d\n", ret);
5437 : : goto out_autopm;
5438 : : }
5439 : :
5440 : 0 : hub->nerrors = 0;
5441 : 0 : hub->error = 0;
5442 : : }
5443 : :
5444 : : /* deal with port status changes */
5445 [ + + ]: 1509 : for (i = 1; i <= hdev->maxchild; i++) {
5446 : 1509 : struct usb_port *port_dev = hub->ports[i - 1];
5447 : :
5448 [ + + ]: 3018 : if (test_bit(i, hub->event_bits)
5449 [ + + ]: 2580 : || test_bit(i, hub->change_bits)
5450 [ - + ]: 924 : || test_bit(i, hub->wakeup_bits)) {
5451 : : /*
5452 : : * The get_noresume and barrier ensure that if
5453 : : * the port was in the process of resuming, we
5454 : : * flush that work and keep the port active for
5455 : : * the duration of the port_event(). However,
5456 : : * if the port is runtime pm suspended
5457 : : * (powered-off), we leave it in that state, run
5458 : : * an abbreviated port_event(), and move on.
5459 : : */
5460 : : pm_runtime_get_noresume(&port_dev->dev);
5461 : 1047 : pm_runtime_barrier(&port_dev->dev);
5462 : : usb_lock_port(port_dev);
5463 : 1047 : port_event(hub, i);
5464 : : usb_unlock_port(port_dev);
5465 : : pm_runtime_put_sync(&port_dev->dev);
5466 : : }
5467 : : }
5468 : :
5469 : : /* deal with hub status changes */
5470 [ - + ]: 633 : if (test_and_clear_bit(0, hub->event_bits) == 0)
5471 : : ; /* do nothing */
5472 [ # # ]: 0 : else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
5473 : 0 : dev_err(hub_dev, "get_hub_status failed\n");
5474 : : else {
5475 [ # # ]: 0 : if (hubchange & HUB_CHANGE_LOCAL_POWER) {
5476 : : dev_dbg(hub_dev, "power change\n");
5477 : 0 : clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
5478 [ # # ]: 0 : if (hubstatus & HUB_STATUS_LOCAL_POWER)
5479 : : /* FIXME: Is this always true? */
5480 : 0 : hub->limited_power = 1;
5481 : : else
5482 : 0 : hub->limited_power = 0;
5483 : : }
5484 [ # # ]: 0 : if (hubchange & HUB_CHANGE_OVERCURRENT) {
5485 : 0 : u16 status = 0;
5486 : : u16 unused;
5487 : :
5488 : : dev_dbg(hub_dev, "over-current change\n");
5489 : 0 : clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
5490 : 0 : msleep(500); /* Cool down */
5491 : 0 : hub_power_on(hub, true);
5492 : 0 : hub_hub_status(hub, &status, &unused);
5493 [ # # ]: 0 : if (status & HUB_STATUS_OVERCURRENT)
5494 : 0 : dev_err(hub_dev, "over-current condition\n");
5495 : : }
5496 : : }
5497 : :
5498 : : out_autopm:
5499 : : /* Balance the usb_autopm_get_interface() above */
5500 : 633 : usb_autopm_put_interface_no_suspend(intf);
5501 : : out_hdev_lock:
5502 : : usb_unlock_device(hdev);
5503 : :
5504 : : /* Balance the stuff in kick_hub_wq() and allow autosuspend */
5505 : 633 : usb_autopm_put_interface(intf);
5506 : 633 : kref_put(&hub->kref, hub_release);
5507 : 633 : }
5508 : :
5509 : : static const struct usb_device_id hub_id_table[] = {
5510 : : { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
5511 : : | USB_DEVICE_ID_MATCH_PRODUCT
5512 : : | USB_DEVICE_ID_MATCH_INT_CLASS,
5513 : : .idVendor = USB_VENDOR_SMSC,
5514 : : .idProduct = USB_PRODUCT_USB5534B,
5515 : : .bInterfaceClass = USB_CLASS_HUB,
5516 : : .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
5517 : : { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
5518 : : | USB_DEVICE_ID_MATCH_INT_CLASS,
5519 : : .idVendor = USB_VENDOR_GENESYS_LOGIC,
5520 : : .bInterfaceClass = USB_CLASS_HUB,
5521 : : .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND},
5522 : : { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
5523 : : .bDeviceClass = USB_CLASS_HUB},
5524 : : { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
5525 : : .bInterfaceClass = USB_CLASS_HUB},
5526 : : { } /* Terminating entry */
5527 : : };
5528 : :
5529 : : MODULE_DEVICE_TABLE(usb, hub_id_table);
5530 : :
5531 : : static struct usb_driver hub_driver = {
5532 : : .name = "hub",
5533 : : .probe = hub_probe,
5534 : : .disconnect = hub_disconnect,
5535 : : .suspend = hub_suspend,
5536 : : .resume = hub_resume,
5537 : : .reset_resume = hub_reset_resume,
5538 : : .pre_reset = hub_pre_reset,
5539 : : .post_reset = hub_post_reset,
5540 : : .unlocked_ioctl = hub_ioctl,
5541 : : .id_table = hub_id_table,
5542 : : .supports_autosuspend = 1,
5543 : : };
5544 : :
5545 : 207 : int usb_hub_init(void)
5546 : : {
5547 [ - + ]: 207 : if (usb_register(&hub_driver) < 0) {
5548 : 0 : printk(KERN_ERR "%s: can't register hub driver\n",
5549 : : usbcore_name);
5550 : 0 : return -1;
5551 : : }
5552 : :
5553 : : /*
5554 : : * The workqueue needs to be freezable to avoid interfering with
5555 : : * USB-PERSIST port handover. Otherwise it might see that a full-speed
5556 : : * device was gone before the EHCI controller had handed its port
5557 : : * over to the companion full-speed controller.
5558 : : */
5559 : 207 : hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0);
5560 [ - + ]: 207 : if (hub_wq)
5561 : : return 0;
5562 : :
5563 : : /* Fall through if kernel_thread failed */
5564 : 0 : usb_deregister(&hub_driver);
5565 : 0 : pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name);
5566 : :
5567 : 0 : return -1;
5568 : : }
5569 : :
5570 : 0 : void usb_hub_cleanup(void)
5571 : : {
5572 : 0 : destroy_workqueue(hub_wq);
5573 : :
5574 : : /*
5575 : : * Hub resources are freed for us by usb_deregister. It calls
5576 : : * usb_driver_purge on every device which in turn calls that
5577 : : * devices disconnect function if it is using this driver.
5578 : : * The hub_disconnect function takes care of releasing the
5579 : : * individual hub resources. -greg
5580 : : */
5581 : 0 : usb_deregister(&hub_driver);
5582 : 0 : } /* usb_hub_cleanup() */
5583 : :
5584 : 0 : static int descriptors_changed(struct usb_device *udev,
5585 : : struct usb_device_descriptor *old_device_descriptor,
5586 : : struct usb_host_bos *old_bos)
5587 : : {
5588 : : int changed = 0;
5589 : : unsigned index;
5590 : : unsigned serial_len = 0;
5591 : : unsigned len;
5592 : : unsigned old_length;
5593 : : int length;
5594 : : char *buf;
5595 : :
5596 [ # # ]: 0 : if (memcmp(&udev->descriptor, old_device_descriptor,
5597 : : sizeof(*old_device_descriptor)) != 0)
5598 : : return 1;
5599 : :
5600 [ # # # # : 0 : if ((old_bos && !udev->bos) || (!old_bos && udev->bos))
# # # # ]
5601 : : return 1;
5602 [ # # ]: 0 : if (udev->bos) {
5603 : 0 : len = le16_to_cpu(udev->bos->desc->wTotalLength);
5604 [ # # ]: 0 : if (len != le16_to_cpu(old_bos->desc->wTotalLength))
5605 : : return 1;
5606 [ # # ]: 0 : if (memcmp(udev->bos->desc, old_bos->desc, len))
5607 : : return 1;
5608 : : }
5609 : :
5610 : : /* Since the idVendor, idProduct, and bcdDevice values in the
5611 : : * device descriptor haven't changed, we will assume the
5612 : : * Manufacturer and Product strings haven't changed either.
5613 : : * But the SerialNumber string could be different (e.g., a
5614 : : * different flash card of the same brand).
5615 : : */
5616 [ # # ]: 0 : if (udev->serial)
5617 : 0 : serial_len = strlen(udev->serial) + 1;
5618 : :
5619 : : len = serial_len;
5620 [ # # ]: 0 : for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
5621 : 0 : old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
5622 : 0 : len = max(len, old_length);
5623 : : }
5624 : :
5625 : : buf = kmalloc(len, GFP_NOIO);
5626 [ # # ]: 0 : if (!buf)
5627 : : /* assume the worst */
5628 : : return 1;
5629 : :
5630 [ # # ]: 0 : for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
5631 : 0 : old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
5632 : 0 : length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
5633 : : old_length);
5634 [ # # ]: 0 : if (length != old_length) {
5635 : : dev_dbg(&udev->dev, "config index %d, error %d\n",
5636 : : index, length);
5637 : : changed = 1;
5638 : : break;
5639 : : }
5640 [ # # ]: 0 : if (memcmp(buf, udev->rawdescriptors[index], old_length)
5641 : : != 0) {
5642 : : dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
5643 : : index,
5644 : : ((struct usb_config_descriptor *) buf)->
5645 : : bConfigurationValue);
5646 : : changed = 1;
5647 : : break;
5648 : : }
5649 : : }
5650 : :
5651 [ # # ]: 0 : if (!changed && serial_len) {
5652 : 0 : length = usb_string(udev, udev->descriptor.iSerialNumber,
5653 : : buf, serial_len);
5654 [ # # ]: 0 : if (length + 1 != serial_len) {
5655 : : dev_dbg(&udev->dev, "serial string error %d\n",
5656 : : length);
5657 : : changed = 1;
5658 [ # # ]: 0 : } else if (memcmp(buf, udev->serial, length) != 0) {
5659 : : dev_dbg(&udev->dev, "serial string changed\n");
5660 : : changed = 1;
5661 : : }
5662 : : }
5663 : :
5664 : 0 : kfree(buf);
5665 : 0 : return changed;
5666 : : }
5667 : :
5668 : : /**
5669 : : * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
5670 : : * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5671 : : *
5672 : : * WARNING - don't use this routine to reset a composite device
5673 : : * (one with multiple interfaces owned by separate drivers)!
5674 : : * Use usb_reset_device() instead.
5675 : : *
5676 : : * Do a port reset, reassign the device's address, and establish its
5677 : : * former operating configuration. If the reset fails, or the device's
5678 : : * descriptors change from their values before the reset, or the original
5679 : : * configuration and altsettings cannot be restored, a flag will be set
5680 : : * telling hub_wq to pretend the device has been disconnected and then
5681 : : * re-connected. All drivers will be unbound, and the device will be
5682 : : * re-enumerated and probed all over again.
5683 : : *
5684 : : * Return: 0 if the reset succeeded, -ENODEV if the device has been
5685 : : * flagged for logical disconnection, or some other negative error code
5686 : : * if the reset wasn't even attempted.
5687 : : *
5688 : : * Note:
5689 : : * The caller must own the device lock and the port lock, the latter is
5690 : : * taken by usb_reset_device(). For example, it's safe to use
5691 : : * usb_reset_device() from a driver probe() routine after downloading
5692 : : * new firmware. For calls that might not occur during probe(), drivers
5693 : : * should lock the device using usb_lock_device_for_reset().
5694 : : *
5695 : : * Locking exception: This routine may also be called from within an
5696 : : * autoresume handler. Such usage won't conflict with other tasks
5697 : : * holding the device lock because these tasks should always call
5698 : : * usb_autopm_resume_device(), thereby preventing any unwanted
5699 : : * autoresume. The autoresume handler is expected to have already
5700 : : * acquired the port lock before calling this routine.
5701 : : */
5702 : 0 : static int usb_reset_and_verify_device(struct usb_device *udev)
5703 : : {
5704 : 0 : struct usb_device *parent_hdev = udev->parent;
5705 : : struct usb_hub *parent_hub;
5706 : 0 : struct usb_hcd *hcd = bus_to_hcd(udev->bus);
5707 : 0 : struct usb_device_descriptor descriptor = udev->descriptor;
5708 : : struct usb_host_bos *bos;
5709 : : int i, j, ret = 0;
5710 : 0 : int port1 = udev->portnum;
5711 : :
5712 [ # # ]: 0 : if (udev->state == USB_STATE_NOTATTACHED ||
5713 : : udev->state == USB_STATE_SUSPENDED) {
5714 : : dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
5715 : : udev->state);
5716 : : return -EINVAL;
5717 : : }
5718 : :
5719 [ # # ]: 0 : if (!parent_hdev)
5720 : : return -EISDIR;
5721 : :
5722 : : parent_hub = usb_hub_to_struct_hub(parent_hdev);
5723 : :
5724 : : /* Disable USB2 hardware LPM.
5725 : : * It will be re-enabled by the enumeration process.
5726 : : */
5727 : 0 : usb_disable_usb2_hardware_lpm(udev);
5728 : :
5729 : : /* Disable LPM while we reset the device and reinstall the alt settings.
5730 : : * Device-initiated LPM, and system exit latency settings are cleared
5731 : : * when the device is reset, so we have to set them up again.
5732 : : */
5733 : 0 : ret = usb_unlocked_disable_lpm(udev);
5734 [ # # ]: 0 : if (ret) {
5735 : 0 : dev_err(&udev->dev, "%s Failed to disable LPM\n", __func__);
5736 : 0 : goto re_enumerate_no_bos;
5737 : : }
5738 : :
5739 : 0 : bos = udev->bos;
5740 : 0 : udev->bos = NULL;
5741 : :
5742 [ # # ]: 0 : for (i = 0; i < SET_CONFIG_TRIES; ++i) {
5743 : :
5744 : : /* ep0 maxpacket size may change; let the HCD know about it.
5745 : : * Other endpoints will be handled by re-enumeration. */
5746 : 0 : usb_ep0_reinit(udev);
5747 : 0 : ret = hub_port_init(parent_hub, udev, port1, i);
5748 [ # # # # ]: 0 : if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
5749 : : break;
5750 : : }
5751 : :
5752 [ # # ]: 0 : if (ret < 0)
5753 : : goto re_enumerate;
5754 : :
5755 : : /* Device might have changed firmware (DFU or similar) */
5756 [ # # ]: 0 : if (descriptors_changed(udev, &descriptor, bos)) {
5757 : 0 : dev_info(&udev->dev, "device firmware changed\n");
5758 : 0 : udev->descriptor = descriptor; /* for disconnect() calls */
5759 : 0 : goto re_enumerate;
5760 : : }
5761 : :
5762 : : /* Restore the device's previous configuration */
5763 [ # # ]: 0 : if (!udev->actconfig)
5764 : : goto done;
5765 : :
5766 : 0 : mutex_lock(hcd->bandwidth_mutex);
5767 : 0 : ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
5768 [ # # ]: 0 : if (ret < 0) {
5769 : 0 : dev_warn(&udev->dev,
5770 : : "Busted HC? Not enough HCD resources for "
5771 : : "old configuration.\n");
5772 : 0 : mutex_unlock(hcd->bandwidth_mutex);
5773 : 0 : goto re_enumerate;
5774 : : }
5775 : 0 : ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
5776 : : USB_REQ_SET_CONFIGURATION, 0,
5777 : 0 : udev->actconfig->desc.bConfigurationValue, 0,
5778 : : NULL, 0, USB_CTRL_SET_TIMEOUT);
5779 [ # # ]: 0 : if (ret < 0) {
5780 : 0 : dev_err(&udev->dev,
5781 : : "can't restore configuration #%d (error=%d)\n",
5782 : : udev->actconfig->desc.bConfigurationValue, ret);
5783 : 0 : mutex_unlock(hcd->bandwidth_mutex);
5784 : 0 : goto re_enumerate;
5785 : : }
5786 : 0 : mutex_unlock(hcd->bandwidth_mutex);
5787 : 0 : usb_set_device_state(udev, USB_STATE_CONFIGURED);
5788 : :
5789 : : /* Put interfaces back into the same altsettings as before.
5790 : : * Don't bother to send the Set-Interface request for interfaces
5791 : : * that were already in altsetting 0; besides being unnecessary,
5792 : : * many devices can't handle it. Instead just reset the host-side
5793 : : * endpoint state.
5794 : : */
5795 [ # # ]: 0 : for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
5796 : : struct usb_host_config *config = udev->actconfig;
5797 : 0 : struct usb_interface *intf = config->interface[i];
5798 : : struct usb_interface_descriptor *desc;
5799 : :
5800 : 0 : desc = &intf->cur_altsetting->desc;
5801 [ # # ]: 0 : if (desc->bAlternateSetting == 0) {
5802 : 0 : usb_disable_interface(udev, intf, true);
5803 : 0 : usb_enable_interface(udev, intf, true);
5804 : : ret = 0;
5805 : : } else {
5806 : : /* Let the bandwidth allocation function know that this
5807 : : * device has been reset, and it will have to use
5808 : : * alternate setting 0 as the current alternate setting.
5809 : : */
5810 : 0 : intf->resetting_device = 1;
5811 : 0 : ret = usb_set_interface(udev, desc->bInterfaceNumber,
5812 : 0 : desc->bAlternateSetting);
5813 : 0 : intf->resetting_device = 0;
5814 : : }
5815 [ # # ]: 0 : if (ret < 0) {
5816 : 0 : dev_err(&udev->dev, "failed to restore interface %d "
5817 : : "altsetting %d (error=%d)\n",
5818 : : desc->bInterfaceNumber,
5819 : : desc->bAlternateSetting,
5820 : : ret);
5821 : 0 : goto re_enumerate;
5822 : : }
5823 : : /* Resetting also frees any allocated streams */
5824 [ # # ]: 0 : for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++)
5825 : 0 : intf->cur_altsetting->endpoint[j].streams = 0;
5826 : : }
5827 : :
5828 : : done:
5829 : : /* Now that the alt settings are re-installed, enable LTM and LPM. */
5830 : 0 : usb_enable_usb2_hardware_lpm(udev);
5831 : 0 : usb_unlocked_enable_lpm(udev);
5832 : 0 : usb_enable_ltm(udev);
5833 : 0 : usb_release_bos_descriptor(udev);
5834 : 0 : udev->bos = bos;
5835 : 0 : return 0;
5836 : :
5837 : : re_enumerate:
5838 : 0 : usb_release_bos_descriptor(udev);
5839 : 0 : udev->bos = bos;
5840 : : re_enumerate_no_bos:
5841 : : /* LPM state doesn't matter when we're about to destroy the device. */
5842 : 0 : hub_port_logical_disconnect(parent_hub, port1);
5843 : 0 : return -ENODEV;
5844 : : }
5845 : :
5846 : : /**
5847 : : * usb_reset_device - warn interface drivers and perform a USB port reset
5848 : : * @udev: device to reset (not in NOTATTACHED state)
5849 : : *
5850 : : * Warns all drivers bound to registered interfaces (using their pre_reset
5851 : : * method), performs the port reset, and then lets the drivers know that
5852 : : * the reset is over (using their post_reset method).
5853 : : *
5854 : : * Return: The same as for usb_reset_and_verify_device().
5855 : : *
5856 : : * Note:
5857 : : * The caller must own the device lock. For example, it's safe to use
5858 : : * this from a driver probe() routine after downloading new firmware.
5859 : : * For calls that might not occur during probe(), drivers should lock
5860 : : * the device using usb_lock_device_for_reset().
5861 : : *
5862 : : * If an interface is currently being probed or disconnected, we assume
5863 : : * its driver knows how to handle resets. For all other interfaces,
5864 : : * if the driver doesn't have pre_reset and post_reset methods then
5865 : : * we attempt to unbind it and rebind afterward.
5866 : : */
5867 : 0 : int usb_reset_device(struct usb_device *udev)
5868 : : {
5869 : : int ret;
5870 : : int i;
5871 : : unsigned int noio_flag;
5872 : : struct usb_port *port_dev;
5873 : 0 : struct usb_host_config *config = udev->actconfig;
5874 : 0 : struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
5875 : :
5876 [ # # ]: 0 : if (udev->state == USB_STATE_NOTATTACHED) {
5877 : : dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
5878 : : udev->state);
5879 : : return -EINVAL;
5880 : : }
5881 : :
5882 [ # # ]: 0 : if (!udev->parent) {
5883 : : /* this requires hcd-specific logic; see ohci_restart() */
5884 : : dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
5885 : : return -EISDIR;
5886 : : }
5887 : :
5888 : 0 : port_dev = hub->ports[udev->portnum - 1];
5889 : :
5890 : : /*
5891 : : * Don't allocate memory with GFP_KERNEL in current
5892 : : * context to avoid possible deadlock if usb mass
5893 : : * storage interface or usbnet interface(iSCSI case)
5894 : : * is included in current configuration. The easist
5895 : : * approach is to do it for every device reset,
5896 : : * because the device 'memalloc_noio' flag may have
5897 : : * not been set before reseting the usb device.
5898 : : */
5899 : : noio_flag = memalloc_noio_save();
5900 : :
5901 : : /* Prevent autosuspend during the reset */
5902 : 0 : usb_autoresume_device(udev);
5903 : :
5904 [ # # ]: 0 : if (config) {
5905 [ # # ]: 0 : for (i = 0; i < config->desc.bNumInterfaces; ++i) {
5906 : 0 : struct usb_interface *cintf = config->interface[i];
5907 : : struct usb_driver *drv;
5908 : : int unbind = 0;
5909 : :
5910 [ # # ]: 0 : if (cintf->dev.driver) {
5911 : : drv = to_usb_driver(cintf->dev.driver);
5912 [ # # # # ]: 0 : if (drv->pre_reset && drv->post_reset)
5913 : 0 : unbind = (drv->pre_reset)(cintf);
5914 [ # # ]: 0 : else if (cintf->condition ==
5915 : : USB_INTERFACE_BOUND)
5916 : : unbind = 1;
5917 [ # # ]: 0 : if (unbind)
5918 : 0 : usb_forced_unbind_intf(cintf);
5919 : : }
5920 : : }
5921 : : }
5922 : :
5923 : : usb_lock_port(port_dev);
5924 : 0 : ret = usb_reset_and_verify_device(udev);
5925 : : usb_unlock_port(port_dev);
5926 : :
5927 [ # # ]: 0 : if (config) {
5928 [ # # ]: 0 : for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
5929 : 0 : struct usb_interface *cintf = config->interface[i];
5930 : : struct usb_driver *drv;
5931 : 0 : int rebind = cintf->needs_binding;
5932 : :
5933 [ # # # # ]: 0 : if (!rebind && cintf->dev.driver) {
5934 : : drv = to_usb_driver(cintf->dev.driver);
5935 [ # # ]: 0 : if (drv->post_reset)
5936 : 0 : rebind = (drv->post_reset)(cintf);
5937 [ # # ]: 0 : else if (cintf->condition ==
5938 : : USB_INTERFACE_BOUND)
5939 : : rebind = 1;
5940 [ # # ]: 0 : if (rebind)
5941 : 0 : cintf->needs_binding = 1;
5942 : : }
5943 : : }
5944 : :
5945 : : /* If the reset failed, hub_wq will unbind drivers later */
5946 [ # # ]: 0 : if (ret == 0)
5947 : 0 : usb_unbind_and_rebind_marked_interfaces(udev);
5948 : : }
5949 : :
5950 : 0 : usb_autosuspend_device(udev);
5951 : : memalloc_noio_restore(noio_flag);
5952 : 0 : return ret;
5953 : : }
5954 : : EXPORT_SYMBOL_GPL(usb_reset_device);
5955 : :
5956 : :
5957 : : /**
5958 : : * usb_queue_reset_device - Reset a USB device from an atomic context
5959 : : * @iface: USB interface belonging to the device to reset
5960 : : *
5961 : : * This function can be used to reset a USB device from an atomic
5962 : : * context, where usb_reset_device() won't work (as it blocks).
5963 : : *
5964 : : * Doing a reset via this method is functionally equivalent to calling
5965 : : * usb_reset_device(), except for the fact that it is delayed to a
5966 : : * workqueue. This means that any drivers bound to other interfaces
5967 : : * might be unbound, as well as users from usbfs in user space.
5968 : : *
5969 : : * Corner cases:
5970 : : *
5971 : : * - Scheduling two resets at the same time from two different drivers
5972 : : * attached to two different interfaces of the same device is
5973 : : * possible; depending on how the driver attached to each interface
5974 : : * handles ->pre_reset(), the second reset might happen or not.
5975 : : *
5976 : : * - If the reset is delayed so long that the interface is unbound from
5977 : : * its driver, the reset will be skipped.
5978 : : *
5979 : : * - This function can be called during .probe(). It can also be called
5980 : : * during .disconnect(), but doing so is pointless because the reset
5981 : : * will not occur. If you really want to reset the device during
5982 : : * .disconnect(), call usb_reset_device() directly -- but watch out
5983 : : * for nested unbinding issues!
5984 : : */
5985 : 0 : void usb_queue_reset_device(struct usb_interface *iface)
5986 : : {
5987 [ # # ]: 0 : if (schedule_work(&iface->reset_ws))
5988 : 0 : usb_get_intf(iface);
5989 : 0 : }
5990 : : EXPORT_SYMBOL_GPL(usb_queue_reset_device);
5991 : :
5992 : : /**
5993 : : * usb_hub_find_child - Get the pointer of child device
5994 : : * attached to the port which is specified by @port1.
5995 : : * @hdev: USB device belonging to the usb hub
5996 : : * @port1: port num to indicate which port the child device
5997 : : * is attached to.
5998 : : *
5999 : : * USB drivers call this function to get hub's child device
6000 : : * pointer.
6001 : : *
6002 : : * Return: %NULL if input param is invalid and
6003 : : * child's usb_device pointer if non-NULL.
6004 : : */
6005 : 0 : struct usb_device *usb_hub_find_child(struct usb_device *hdev,
6006 : : int port1)
6007 : : {
6008 : : struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
6009 : :
6010 [ # # # # ]: 0 : if (port1 < 1 || port1 > hdev->maxchild)
6011 : : return NULL;
6012 : 0 : return hub->ports[port1 - 1]->child;
6013 : : }
6014 : : EXPORT_SYMBOL_GPL(usb_hub_find_child);
6015 : :
6016 : 621 : void usb_hub_adjust_deviceremovable(struct usb_device *hdev,
6017 : : struct usb_hub_descriptor *desc)
6018 : : {
6019 : : struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
6020 : : enum usb_port_connect_type connect_type;
6021 : : int i;
6022 : :
6023 [ + + ]: 621 : if (!hub)
6024 : 621 : return;
6025 : :
6026 [ + - ]: 414 : if (!hub_is_superspeed(hdev)) {
6027 [ + + ]: 1242 : for (i = 1; i <= hdev->maxchild; i++) {
6028 : 1242 : struct usb_port *port_dev = hub->ports[i - 1];
6029 : :
6030 : 1242 : connect_type = port_dev->connect_type;
6031 [ - + ]: 1242 : if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
6032 : 0 : u8 mask = 1 << (i%8);
6033 : :
6034 [ # # ]: 0 : if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) {
6035 : : dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n");
6036 : 0 : desc->u.hs.DeviceRemovable[i/8] |= mask;
6037 : : }
6038 : : }
6039 : : }
6040 : : } else {
6041 : 0 : u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable);
6042 : :
6043 [ # # ]: 0 : for (i = 1; i <= hdev->maxchild; i++) {
6044 : 0 : struct usb_port *port_dev = hub->ports[i - 1];
6045 : :
6046 : 0 : connect_type = port_dev->connect_type;
6047 [ # # ]: 0 : if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
6048 : 0 : u16 mask = 1 << i;
6049 : :
6050 [ # # ]: 0 : if (!(port_removable & mask)) {
6051 : : dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n");
6052 : 0 : port_removable |= mask;
6053 : : }
6054 : : }
6055 : : }
6056 : :
6057 : 0 : desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
6058 : : }
6059 : : }
6060 : :
6061 : : #ifdef CONFIG_ACPI
6062 : : /**
6063 : : * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
6064 : : * @hdev: USB device belonging to the usb hub
6065 : : * @port1: port num of the port
6066 : : *
6067 : : * Return: Port's acpi handle if successful, %NULL if params are
6068 : : * invalid.
6069 : : */
6070 : : acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
6071 : : int port1)
6072 : : {
6073 : : struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
6074 : :
6075 : : if (!hub)
6076 : : return NULL;
6077 : :
6078 : : return ACPI_HANDLE(&hub->ports[port1 - 1]->dev);
6079 : : }
6080 : : #endif
|
