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1 : : /* SPDX-License-Identifier: GPL-2.0 */
2 : : #ifndef __LINUX_USB_H
3 : : #define __LINUX_USB_H
4 : :
5 : : #include <linux/mod_devicetable.h>
6 : : #include <linux/usb/ch9.h>
7 : :
8 : : #define USB_MAJOR 180
9 : : #define USB_DEVICE_MAJOR 189
10 : :
11 : :
12 : : #ifdef __KERNEL__
13 : :
14 : : #include <linux/errno.h> /* for -ENODEV */
15 : : #include <linux/delay.h> /* for mdelay() */
16 : : #include <linux/interrupt.h> /* for in_interrupt() */
17 : : #include <linux/list.h> /* for struct list_head */
18 : : #include <linux/kref.h> /* for struct kref */
19 : : #include <linux/device.h> /* for struct device */
20 : : #include <linux/fs.h> /* for struct file_operations */
21 : : #include <linux/completion.h> /* for struct completion */
22 : : #include <linux/sched.h> /* for current && schedule_timeout */
23 : : #include <linux/mutex.h> /* for struct mutex */
24 : : #include <linux/pm_runtime.h> /* for runtime PM */
25 : :
26 : : struct usb_device;
27 : : struct usb_driver;
28 : : struct wusb_dev;
29 : :
30 : : /*-------------------------------------------------------------------------*/
31 : :
32 : : /*
33 : : * Host-side wrappers for standard USB descriptors ... these are parsed
34 : : * from the data provided by devices. Parsing turns them from a flat
35 : : * sequence of descriptors into a hierarchy:
36 : : *
37 : : * - devices have one (usually) or more configs;
38 : : * - configs have one (often) or more interfaces;
39 : : * - interfaces have one (usually) or more settings;
40 : : * - each interface setting has zero or (usually) more endpoints.
41 : : * - a SuperSpeed endpoint has a companion descriptor
42 : : *
43 : : * And there might be other descriptors mixed in with those.
44 : : *
45 : : * Devices may also have class-specific or vendor-specific descriptors.
46 : : */
47 : :
48 : : struct ep_device;
49 : :
50 : : /**
51 : : * struct usb_host_endpoint - host-side endpoint descriptor and queue
52 : : * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
53 : : * @ss_ep_comp: SuperSpeed companion descriptor for this endpoint
54 : : * @ssp_isoc_ep_comp: SuperSpeedPlus isoc companion descriptor for this endpoint
55 : : * @urb_list: urbs queued to this endpoint; maintained by usbcore
56 : : * @hcpriv: for use by HCD; typically holds hardware dma queue head (QH)
57 : : * with one or more transfer descriptors (TDs) per urb
58 : : * @ep_dev: ep_device for sysfs info
59 : : * @extra: descriptors following this endpoint in the configuration
60 : : * @extralen: how many bytes of "extra" are valid
61 : : * @enabled: URBs may be submitted to this endpoint
62 : : * @streams: number of USB-3 streams allocated on the endpoint
63 : : *
64 : : * USB requests are always queued to a given endpoint, identified by a
65 : : * descriptor within an active interface in a given USB configuration.
66 : : */
67 : : struct usb_host_endpoint {
68 : : struct usb_endpoint_descriptor desc;
69 : : struct usb_ss_ep_comp_descriptor ss_ep_comp;
70 : : struct usb_ssp_isoc_ep_comp_descriptor ssp_isoc_ep_comp;
71 : : struct list_head urb_list;
72 : : void *hcpriv;
73 : : struct ep_device *ep_dev; /* For sysfs info */
74 : :
75 : : unsigned char *extra; /* Extra descriptors */
76 : : int extralen;
77 : : int enabled;
78 : : int streams;
79 : : };
80 : :
81 : : /* host-side wrapper for one interface setting's parsed descriptors */
82 : : struct usb_host_interface {
83 : : struct usb_interface_descriptor desc;
84 : :
85 : : int extralen;
86 : : unsigned char *extra; /* Extra descriptors */
87 : :
88 : : /* array of desc.bNumEndpoints endpoints associated with this
89 : : * interface setting. these will be in no particular order.
90 : : */
91 : : struct usb_host_endpoint *endpoint;
92 : :
93 : : char *string; /* iInterface string, if present */
94 : : };
95 : :
96 : : enum usb_interface_condition {
97 : : USB_INTERFACE_UNBOUND = 0,
98 : : USB_INTERFACE_BINDING,
99 : : USB_INTERFACE_BOUND,
100 : : USB_INTERFACE_UNBINDING,
101 : : };
102 : :
103 : : int __must_check
104 : : usb_find_common_endpoints(struct usb_host_interface *alt,
105 : : struct usb_endpoint_descriptor **bulk_in,
106 : : struct usb_endpoint_descriptor **bulk_out,
107 : : struct usb_endpoint_descriptor **int_in,
108 : : struct usb_endpoint_descriptor **int_out);
109 : :
110 : : int __must_check
111 : : usb_find_common_endpoints_reverse(struct usb_host_interface *alt,
112 : : struct usb_endpoint_descriptor **bulk_in,
113 : : struct usb_endpoint_descriptor **bulk_out,
114 : : struct usb_endpoint_descriptor **int_in,
115 : : struct usb_endpoint_descriptor **int_out);
116 : :
117 : : static inline int __must_check
118 : : usb_find_bulk_in_endpoint(struct usb_host_interface *alt,
119 : : struct usb_endpoint_descriptor **bulk_in)
120 : : {
121 : : return usb_find_common_endpoints(alt, bulk_in, NULL, NULL, NULL);
122 : : }
123 : :
124 : : static inline int __must_check
125 : 0 : usb_find_bulk_out_endpoint(struct usb_host_interface *alt,
126 : : struct usb_endpoint_descriptor **bulk_out)
127 : : {
128 : 0 : return usb_find_common_endpoints(alt, NULL, bulk_out, NULL, NULL);
129 : : }
130 : :
131 : : static inline int __must_check
132 : 0 : usb_find_int_in_endpoint(struct usb_host_interface *alt,
133 : : struct usb_endpoint_descriptor **int_in)
134 : : {
135 : 0 : return usb_find_common_endpoints(alt, NULL, NULL, int_in, NULL);
136 : : }
137 : :
138 : : static inline int __must_check
139 : : usb_find_int_out_endpoint(struct usb_host_interface *alt,
140 : : struct usb_endpoint_descriptor **int_out)
141 : : {
142 : : return usb_find_common_endpoints(alt, NULL, NULL, NULL, int_out);
143 : : }
144 : :
145 : : static inline int __must_check
146 : : usb_find_last_bulk_in_endpoint(struct usb_host_interface *alt,
147 : : struct usb_endpoint_descriptor **bulk_in)
148 : : {
149 : : return usb_find_common_endpoints_reverse(alt, bulk_in, NULL, NULL, NULL);
150 : : }
151 : :
152 : : static inline int __must_check
153 : : usb_find_last_bulk_out_endpoint(struct usb_host_interface *alt,
154 : : struct usb_endpoint_descriptor **bulk_out)
155 : : {
156 : : return usb_find_common_endpoints_reverse(alt, NULL, bulk_out, NULL, NULL);
157 : : }
158 : :
159 : : static inline int __must_check
160 : : usb_find_last_int_in_endpoint(struct usb_host_interface *alt,
161 : : struct usb_endpoint_descriptor **int_in)
162 : : {
163 : : return usb_find_common_endpoints_reverse(alt, NULL, NULL, int_in, NULL);
164 : : }
165 : :
166 : : static inline int __must_check
167 : : usb_find_last_int_out_endpoint(struct usb_host_interface *alt,
168 : : struct usb_endpoint_descriptor **int_out)
169 : : {
170 : : return usb_find_common_endpoints_reverse(alt, NULL, NULL, NULL, int_out);
171 : : }
172 : :
173 : : /**
174 : : * struct usb_interface - what usb device drivers talk to
175 : : * @altsetting: array of interface structures, one for each alternate
176 : : * setting that may be selected. Each one includes a set of
177 : : * endpoint configurations. They will be in no particular order.
178 : : * @cur_altsetting: the current altsetting.
179 : : * @num_altsetting: number of altsettings defined.
180 : : * @intf_assoc: interface association descriptor
181 : : * @minor: the minor number assigned to this interface, if this
182 : : * interface is bound to a driver that uses the USB major number.
183 : : * If this interface does not use the USB major, this field should
184 : : * be unused. The driver should set this value in the probe()
185 : : * function of the driver, after it has been assigned a minor
186 : : * number from the USB core by calling usb_register_dev().
187 : : * @condition: binding state of the interface: not bound, binding
188 : : * (in probe()), bound to a driver, or unbinding (in disconnect())
189 : : * @sysfs_files_created: sysfs attributes exist
190 : : * @ep_devs_created: endpoint child pseudo-devices exist
191 : : * @unregistering: flag set when the interface is being unregistered
192 : : * @needs_remote_wakeup: flag set when the driver requires remote-wakeup
193 : : * capability during autosuspend.
194 : : * @needs_altsetting0: flag set when a set-interface request for altsetting 0
195 : : * has been deferred.
196 : : * @needs_binding: flag set when the driver should be re-probed or unbound
197 : : * following a reset or suspend operation it doesn't support.
198 : : * @authorized: This allows to (de)authorize individual interfaces instead
199 : : * a whole device in contrast to the device authorization.
200 : : * @dev: driver model's view of this device
201 : : * @usb_dev: if an interface is bound to the USB major, this will point
202 : : * to the sysfs representation for that device.
203 : : * @reset_ws: Used for scheduling resets from atomic context.
204 : : * @resetting_device: USB core reset the device, so use alt setting 0 as
205 : : * current; needs bandwidth alloc after reset.
206 : : *
207 : : * USB device drivers attach to interfaces on a physical device. Each
208 : : * interface encapsulates a single high level function, such as feeding
209 : : * an audio stream to a speaker or reporting a change in a volume control.
210 : : * Many USB devices only have one interface. The protocol used to talk to
211 : : * an interface's endpoints can be defined in a usb "class" specification,
212 : : * or by a product's vendor. The (default) control endpoint is part of
213 : : * every interface, but is never listed among the interface's descriptors.
214 : : *
215 : : * The driver that is bound to the interface can use standard driver model
216 : : * calls such as dev_get_drvdata() on the dev member of this structure.
217 : : *
218 : : * Each interface may have alternate settings. The initial configuration
219 : : * of a device sets altsetting 0, but the device driver can change
220 : : * that setting using usb_set_interface(). Alternate settings are often
221 : : * used to control the use of periodic endpoints, such as by having
222 : : * different endpoints use different amounts of reserved USB bandwidth.
223 : : * All standards-conformant USB devices that use isochronous endpoints
224 : : * will use them in non-default settings.
225 : : *
226 : : * The USB specification says that alternate setting numbers must run from
227 : : * 0 to one less than the total number of alternate settings. But some
228 : : * devices manage to mess this up, and the structures aren't necessarily
229 : : * stored in numerical order anyhow. Use usb_altnum_to_altsetting() to
230 : : * look up an alternate setting in the altsetting array based on its number.
231 : : */
232 : : struct usb_interface {
233 : : /* array of alternate settings for this interface,
234 : : * stored in no particular order */
235 : : struct usb_host_interface *altsetting;
236 : :
237 : : struct usb_host_interface *cur_altsetting; /* the currently
238 : : * active alternate setting */
239 : : unsigned num_altsetting; /* number of alternate settings */
240 : :
241 : : /* If there is an interface association descriptor then it will list
242 : : * the associated interfaces */
243 : : struct usb_interface_assoc_descriptor *intf_assoc;
244 : :
245 : : int minor; /* minor number this interface is
246 : : * bound to */
247 : : enum usb_interface_condition condition; /* state of binding */
248 : : unsigned sysfs_files_created:1; /* the sysfs attributes exist */
249 : : unsigned ep_devs_created:1; /* endpoint "devices" exist */
250 : : unsigned unregistering:1; /* unregistration is in progress */
251 : : unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */
252 : : unsigned needs_altsetting0:1; /* switch to altsetting 0 is pending */
253 : : unsigned needs_binding:1; /* needs delayed unbind/rebind */
254 : : unsigned resetting_device:1; /* true: bandwidth alloc after reset */
255 : : unsigned authorized:1; /* used for interface authorization */
256 : :
257 : : struct device dev; /* interface specific device info */
258 : : struct device *usb_dev;
259 : : struct work_struct reset_ws; /* for resets in atomic context */
260 : : };
261 : : #define to_usb_interface(d) container_of(d, struct usb_interface, dev)
262 : :
263 : 0 : static inline void *usb_get_intfdata(struct usb_interface *intf)
264 : : {
265 [ # # # # : 0 : return dev_get_drvdata(&intf->dev);
# # # # #
# # # # #
# # # # ]
266 : : }
267 : :
268 : 0 : static inline void usb_set_intfdata(struct usb_interface *intf, void *data)
269 : : {
270 [ # # # # : 0 : dev_set_drvdata(&intf->dev, data);
# # # # ]
271 : 0 : }
272 : :
273 : : struct usb_interface *usb_get_intf(struct usb_interface *intf);
274 : : void usb_put_intf(struct usb_interface *intf);
275 : :
276 : : /* Hard limit */
277 : : #define USB_MAXENDPOINTS 30
278 : : /* this maximum is arbitrary */
279 : : #define USB_MAXINTERFACES 32
280 : : #define USB_MAXIADS (USB_MAXINTERFACES/2)
281 : :
282 : : /*
283 : : * USB Resume Timer: Every Host controller driver should drive the resume
284 : : * signalling on the bus for the amount of time defined by this macro.
285 : : *
286 : : * That way we will have a 'stable' behavior among all HCDs supported by Linux.
287 : : *
288 : : * Note that the USB Specification states we should drive resume for *at least*
289 : : * 20 ms, but it doesn't give an upper bound. This creates two possible
290 : : * situations which we want to avoid:
291 : : *
292 : : * (a) sometimes an msleep(20) might expire slightly before 20 ms, which causes
293 : : * us to fail USB Electrical Tests, thus failing Certification
294 : : *
295 : : * (b) Some (many) devices actually need more than 20 ms of resume signalling,
296 : : * and while we can argue that's against the USB Specification, we don't have
297 : : * control over which devices a certification laboratory will be using for
298 : : * certification. If CertLab uses a device which was tested against Windows and
299 : : * that happens to have relaxed resume signalling rules, we might fall into
300 : : * situations where we fail interoperability and electrical tests.
301 : : *
302 : : * In order to avoid both conditions, we're using a 40 ms resume timeout, which
303 : : * should cope with both LPJ calibration errors and devices not following every
304 : : * detail of the USB Specification.
305 : : */
306 : : #define USB_RESUME_TIMEOUT 40 /* ms */
307 : :
308 : : /**
309 : : * struct usb_interface_cache - long-term representation of a device interface
310 : : * @num_altsetting: number of altsettings defined.
311 : : * @ref: reference counter.
312 : : * @altsetting: variable-length array of interface structures, one for
313 : : * each alternate setting that may be selected. Each one includes a
314 : : * set of endpoint configurations. They will be in no particular order.
315 : : *
316 : : * These structures persist for the lifetime of a usb_device, unlike
317 : : * struct usb_interface (which persists only as long as its configuration
318 : : * is installed). The altsetting arrays can be accessed through these
319 : : * structures at any time, permitting comparison of configurations and
320 : : * providing support for the /sys/kernel/debug/usb/devices pseudo-file.
321 : : */
322 : : struct usb_interface_cache {
323 : : unsigned num_altsetting; /* number of alternate settings */
324 : : struct kref ref; /* reference counter */
325 : :
326 : : /* variable-length array of alternate settings for this interface,
327 : : * stored in no particular order */
328 : : struct usb_host_interface altsetting[0];
329 : : };
330 : : #define ref_to_usb_interface_cache(r) \
331 : : container_of(r, struct usb_interface_cache, ref)
332 : : #define altsetting_to_usb_interface_cache(a) \
333 : : container_of(a, struct usb_interface_cache, altsetting[0])
334 : :
335 : : /**
336 : : * struct usb_host_config - representation of a device's configuration
337 : : * @desc: the device's configuration descriptor.
338 : : * @string: pointer to the cached version of the iConfiguration string, if
339 : : * present for this configuration.
340 : : * @intf_assoc: list of any interface association descriptors in this config
341 : : * @interface: array of pointers to usb_interface structures, one for each
342 : : * interface in the configuration. The number of interfaces is stored
343 : : * in desc.bNumInterfaces. These pointers are valid only while the
344 : : * the configuration is active.
345 : : * @intf_cache: array of pointers to usb_interface_cache structures, one
346 : : * for each interface in the configuration. These structures exist
347 : : * for the entire life of the device.
348 : : * @extra: pointer to buffer containing all extra descriptors associated
349 : : * with this configuration (those preceding the first interface
350 : : * descriptor).
351 : : * @extralen: length of the extra descriptors buffer.
352 : : *
353 : : * USB devices may have multiple configurations, but only one can be active
354 : : * at any time. Each encapsulates a different operational environment;
355 : : * for example, a dual-speed device would have separate configurations for
356 : : * full-speed and high-speed operation. The number of configurations
357 : : * available is stored in the device descriptor as bNumConfigurations.
358 : : *
359 : : * A configuration can contain multiple interfaces. Each corresponds to
360 : : * a different function of the USB device, and all are available whenever
361 : : * the configuration is active. The USB standard says that interfaces
362 : : * are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot
363 : : * of devices get this wrong. In addition, the interface array is not
364 : : * guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to
365 : : * look up an interface entry based on its number.
366 : : *
367 : : * Device drivers should not attempt to activate configurations. The choice
368 : : * of which configuration to install is a policy decision based on such
369 : : * considerations as available power, functionality provided, and the user's
370 : : * desires (expressed through userspace tools). However, drivers can call
371 : : * usb_reset_configuration() to reinitialize the current configuration and
372 : : * all its interfaces.
373 : : */
374 : : struct usb_host_config {
375 : : struct usb_config_descriptor desc;
376 : :
377 : : char *string; /* iConfiguration string, if present */
378 : :
379 : : /* List of any Interface Association Descriptors in this
380 : : * configuration. */
381 : : struct usb_interface_assoc_descriptor *intf_assoc[USB_MAXIADS];
382 : :
383 : : /* the interfaces associated with this configuration,
384 : : * stored in no particular order */
385 : : struct usb_interface *interface[USB_MAXINTERFACES];
386 : :
387 : : /* Interface information available even when this is not the
388 : : * active configuration */
389 : : struct usb_interface_cache *intf_cache[USB_MAXINTERFACES];
390 : :
391 : : unsigned char *extra; /* Extra descriptors */
392 : : int extralen;
393 : : };
394 : :
395 : : /* USB2.0 and USB3.0 device BOS descriptor set */
396 : : struct usb_host_bos {
397 : : struct usb_bos_descriptor *desc;
398 : :
399 : : /* wireless cap descriptor is handled by wusb */
400 : : struct usb_ext_cap_descriptor *ext_cap;
401 : : struct usb_ss_cap_descriptor *ss_cap;
402 : : struct usb_ssp_cap_descriptor *ssp_cap;
403 : : struct usb_ss_container_id_descriptor *ss_id;
404 : : struct usb_ptm_cap_descriptor *ptm_cap;
405 : : };
406 : :
407 : : int __usb_get_extra_descriptor(char *buffer, unsigned size,
408 : : unsigned char type, void **ptr, size_t min);
409 : : #define usb_get_extra_descriptor(ifpoint, type, ptr) \
410 : : __usb_get_extra_descriptor((ifpoint)->extra, \
411 : : (ifpoint)->extralen, \
412 : : type, (void **)ptr, sizeof(**(ptr)))
413 : :
414 : : /* ----------------------------------------------------------------------- */
415 : :
416 : : /* USB device number allocation bitmap */
417 : : struct usb_devmap {
418 : : unsigned long devicemap[128 / (8*sizeof(unsigned long))];
419 : : };
420 : :
421 : : /*
422 : : * Allocated per bus (tree of devices) we have:
423 : : */
424 : : struct usb_bus {
425 : : struct device *controller; /* host/master side hardware */
426 : : struct device *sysdev; /* as seen from firmware or bus */
427 : : int busnum; /* Bus number (in order of reg) */
428 : : const char *bus_name; /* stable id (PCI slot_name etc) */
429 : : u8 uses_pio_for_control; /*
430 : : * Does the host controller use PIO
431 : : * for control transfers?
432 : : */
433 : : u8 otg_port; /* 0, or number of OTG/HNP port */
434 : : unsigned is_b_host:1; /* true during some HNP roleswitches */
435 : : unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */
436 : : unsigned no_stop_on_short:1; /*
437 : : * Quirk: some controllers don't stop
438 : : * the ep queue on a short transfer
439 : : * with the URB_SHORT_NOT_OK flag set.
440 : : */
441 : : unsigned no_sg_constraint:1; /* no sg constraint */
442 : : unsigned sg_tablesize; /* 0 or largest number of sg list entries */
443 : :
444 : : int devnum_next; /* Next open device number in
445 : : * round-robin allocation */
446 : : struct mutex devnum_next_mutex; /* devnum_next mutex */
447 : :
448 : : struct usb_devmap devmap; /* device address allocation map */
449 : : struct usb_device *root_hub; /* Root hub */
450 : : struct usb_bus *hs_companion; /* Companion EHCI bus, if any */
451 : :
452 : : int bandwidth_allocated; /* on this bus: how much of the time
453 : : * reserved for periodic (intr/iso)
454 : : * requests is used, on average?
455 : : * Units: microseconds/frame.
456 : : * Limits: Full/low speed reserve 90%,
457 : : * while high speed reserves 80%.
458 : : */
459 : : int bandwidth_int_reqs; /* number of Interrupt requests */
460 : : int bandwidth_isoc_reqs; /* number of Isoc. requests */
461 : :
462 : : unsigned resuming_ports; /* bit array: resuming root-hub ports */
463 : :
464 : : #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
465 : : struct mon_bus *mon_bus; /* non-null when associated */
466 : : int monitored; /* non-zero when monitored */
467 : : #endif
468 : : };
469 : :
470 : : struct usb_dev_state;
471 : :
472 : : /* ----------------------------------------------------------------------- */
473 : :
474 : : struct usb_tt;
475 : :
476 : : enum usb_device_removable {
477 : : USB_DEVICE_REMOVABLE_UNKNOWN = 0,
478 : : USB_DEVICE_REMOVABLE,
479 : : USB_DEVICE_FIXED,
480 : : };
481 : :
482 : : enum usb_port_connect_type {
483 : : USB_PORT_CONNECT_TYPE_UNKNOWN = 0,
484 : : USB_PORT_CONNECT_TYPE_HOT_PLUG,
485 : : USB_PORT_CONNECT_TYPE_HARD_WIRED,
486 : : USB_PORT_NOT_USED,
487 : : };
488 : :
489 : : /*
490 : : * USB port quirks.
491 : : */
492 : :
493 : : /* For the given port, prefer the old (faster) enumeration scheme. */
494 : : #define USB_PORT_QUIRK_OLD_SCHEME BIT(0)
495 : :
496 : : /* Decrease TRSTRCY to 10ms during device enumeration. */
497 : : #define USB_PORT_QUIRK_FAST_ENUM BIT(1)
498 : :
499 : : /*
500 : : * USB 2.0 Link Power Management (LPM) parameters.
501 : : */
502 : : struct usb2_lpm_parameters {
503 : : /* Best effort service latency indicate how long the host will drive
504 : : * resume on an exit from L1.
505 : : */
506 : : unsigned int besl;
507 : :
508 : : /* Timeout value in microseconds for the L1 inactivity (LPM) timer.
509 : : * When the timer counts to zero, the parent hub will initiate a LPM
510 : : * transition to L1.
511 : : */
512 : : int timeout;
513 : : };
514 : :
515 : : /*
516 : : * USB 3.0 Link Power Management (LPM) parameters.
517 : : *
518 : : * PEL and SEL are USB 3.0 Link PM latencies for device-initiated LPM exit.
519 : : * MEL is the USB 3.0 Link PM latency for host-initiated LPM exit.
520 : : * All three are stored in nanoseconds.
521 : : */
522 : : struct usb3_lpm_parameters {
523 : : /*
524 : : * Maximum exit latency (MEL) for the host to send a packet to the
525 : : * device (either a Ping for isoc endpoints, or a data packet for
526 : : * interrupt endpoints), the hubs to decode the packet, and for all hubs
527 : : * in the path to transition the links to U0.
528 : : */
529 : : unsigned int mel;
530 : : /*
531 : : * Maximum exit latency for a device-initiated LPM transition to bring
532 : : * all links into U0. Abbreviated as "PEL" in section 9.4.12 of the USB
533 : : * 3.0 spec, with no explanation of what "P" stands for. "Path"?
534 : : */
535 : : unsigned int pel;
536 : :
537 : : /*
538 : : * The System Exit Latency (SEL) includes PEL, and three other
539 : : * latencies. After a device initiates a U0 transition, it will take
540 : : * some time from when the device sends the ERDY to when it will finally
541 : : * receive the data packet. Basically, SEL should be the worse-case
542 : : * latency from when a device starts initiating a U0 transition to when
543 : : * it will get data.
544 : : */
545 : : unsigned int sel;
546 : : /*
547 : : * The idle timeout value that is currently programmed into the parent
548 : : * hub for this device. When the timer counts to zero, the parent hub
549 : : * will initiate an LPM transition to either U1 or U2.
550 : : */
551 : : int timeout;
552 : : };
553 : :
554 : : /**
555 : : * struct usb_device - kernel's representation of a USB device
556 : : * @devnum: device number; address on a USB bus
557 : : * @devpath: device ID string for use in messages (e.g., /port/...)
558 : : * @route: tree topology hex string for use with xHCI
559 : : * @state: device state: configured, not attached, etc.
560 : : * @speed: device speed: high/full/low (or error)
561 : : * @rx_lanes: number of rx lanes in use, USB 3.2 adds dual-lane support
562 : : * @tx_lanes: number of tx lanes in use, USB 3.2 adds dual-lane support
563 : : * @tt: Transaction Translator info; used with low/full speed dev, highspeed hub
564 : : * @ttport: device port on that tt hub
565 : : * @toggle: one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints
566 : : * @parent: our hub, unless we're the root
567 : : * @bus: bus we're part of
568 : : * @ep0: endpoint 0 data (default control pipe)
569 : : * @dev: generic device interface
570 : : * @descriptor: USB device descriptor
571 : : * @bos: USB device BOS descriptor set
572 : : * @config: all of the device's configs
573 : : * @actconfig: the active configuration
574 : : * @ep_in: array of IN endpoints
575 : : * @ep_out: array of OUT endpoints
576 : : * @rawdescriptors: raw descriptors for each config
577 : : * @bus_mA: Current available from the bus
578 : : * @portnum: parent port number (origin 1)
579 : : * @level: number of USB hub ancestors
580 : : * @devaddr: device address, XHCI: assigned by HW, others: same as devnum
581 : : * @can_submit: URBs may be submitted
582 : : * @persist_enabled: USB_PERSIST enabled for this device
583 : : * @have_langid: whether string_langid is valid
584 : : * @authorized: policy has said we can use it;
585 : : * (user space) policy determines if we authorize this device to be
586 : : * used or not. By default, wired USB devices are authorized.
587 : : * WUSB devices are not, until we authorize them from user space.
588 : : * FIXME -- complete doc
589 : : * @authenticated: Crypto authentication passed
590 : : * @wusb: device is Wireless USB
591 : : * @lpm_capable: device supports LPM
592 : : * @usb2_hw_lpm_capable: device can perform USB2 hardware LPM
593 : : * @usb2_hw_lpm_besl_capable: device can perform USB2 hardware BESL LPM
594 : : * @usb2_hw_lpm_enabled: USB2 hardware LPM is enabled
595 : : * @usb2_hw_lpm_allowed: Userspace allows USB 2.0 LPM to be enabled
596 : : * @usb3_lpm_u1_enabled: USB3 hardware U1 LPM enabled
597 : : * @usb3_lpm_u2_enabled: USB3 hardware U2 LPM enabled
598 : : * @string_langid: language ID for strings
599 : : * @product: iProduct string, if present (static)
600 : : * @manufacturer: iManufacturer string, if present (static)
601 : : * @serial: iSerialNumber string, if present (static)
602 : : * @filelist: usbfs files that are open to this device
603 : : * @maxchild: number of ports if hub
604 : : * @quirks: quirks of the whole device
605 : : * @urbnum: number of URBs submitted for the whole device
606 : : * @active_duration: total time device is not suspended
607 : : * @connect_time: time device was first connected
608 : : * @do_remote_wakeup: remote wakeup should be enabled
609 : : * @reset_resume: needs reset instead of resume
610 : : * @port_is_suspended: the upstream port is suspended (L2 or U3)
611 : : * @wusb_dev: if this is a Wireless USB device, link to the WUSB
612 : : * specific data for the device.
613 : : * @slot_id: Slot ID assigned by xHCI
614 : : * @removable: Device can be physically removed from this port
615 : : * @l1_params: best effor service latency for USB2 L1 LPM state, and L1 timeout.
616 : : * @u1_params: exit latencies for USB3 U1 LPM state, and hub-initiated timeout.
617 : : * @u2_params: exit latencies for USB3 U2 LPM state, and hub-initiated timeout.
618 : : * @lpm_disable_count: Ref count used by usb_disable_lpm() and usb_enable_lpm()
619 : : * to keep track of the number of functions that require USB 3.0 Link Power
620 : : * Management to be disabled for this usb_device. This count should only
621 : : * be manipulated by those functions, with the bandwidth_mutex is held.
622 : : * @hub_delay: cached value consisting of:
623 : : * parent->hub_delay + wHubDelay + tTPTransmissionDelay (40ns)
624 : : *
625 : : * Will be used as wValue for SetIsochDelay requests.
626 : : *
627 : : * Notes:
628 : : * Usbcore drivers should not set usbdev->state directly. Instead use
629 : : * usb_set_device_state().
630 : : */
631 : : struct usb_device {
632 : : int devnum;
633 : : char devpath[16];
634 : : u32 route;
635 : : enum usb_device_state state;
636 : : enum usb_device_speed speed;
637 : : unsigned int rx_lanes;
638 : : unsigned int tx_lanes;
639 : :
640 : : struct usb_tt *tt;
641 : : int ttport;
642 : :
643 : : unsigned int toggle[2];
644 : :
645 : : struct usb_device *parent;
646 : : struct usb_bus *bus;
647 : : struct usb_host_endpoint ep0;
648 : :
649 : : struct device dev;
650 : :
651 : : struct usb_device_descriptor descriptor;
652 : : struct usb_host_bos *bos;
653 : : struct usb_host_config *config;
654 : :
655 : : struct usb_host_config *actconfig;
656 : : struct usb_host_endpoint *ep_in[16];
657 : : struct usb_host_endpoint *ep_out[16];
658 : :
659 : : char **rawdescriptors;
660 : :
661 : : unsigned short bus_mA;
662 : : u8 portnum;
663 : : u8 level;
664 : : u8 devaddr;
665 : :
666 : : unsigned can_submit:1;
667 : : unsigned persist_enabled:1;
668 : : unsigned have_langid:1;
669 : : unsigned authorized:1;
670 : : unsigned authenticated:1;
671 : : unsigned wusb:1;
672 : : unsigned lpm_capable:1;
673 : : unsigned usb2_hw_lpm_capable:1;
674 : : unsigned usb2_hw_lpm_besl_capable:1;
675 : : unsigned usb2_hw_lpm_enabled:1;
676 : : unsigned usb2_hw_lpm_allowed:1;
677 : : unsigned usb3_lpm_u1_enabled:1;
678 : : unsigned usb3_lpm_u2_enabled:1;
679 : : int string_langid;
680 : :
681 : : /* static strings from the device */
682 : : char *product;
683 : : char *manufacturer;
684 : : char *serial;
685 : :
686 : : struct list_head filelist;
687 : :
688 : : int maxchild;
689 : :
690 : : u32 quirks;
691 : : atomic_t urbnum;
692 : :
693 : : unsigned long active_duration;
694 : :
695 : : #ifdef CONFIG_PM
696 : : unsigned long connect_time;
697 : :
698 : : unsigned do_remote_wakeup:1;
699 : : unsigned reset_resume:1;
700 : : unsigned port_is_suspended:1;
701 : : #endif
702 : : struct wusb_dev *wusb_dev;
703 : : int slot_id;
704 : : enum usb_device_removable removable;
705 : : struct usb2_lpm_parameters l1_params;
706 : : struct usb3_lpm_parameters u1_params;
707 : : struct usb3_lpm_parameters u2_params;
708 : : unsigned lpm_disable_count;
709 : :
710 : : u16 hub_delay;
711 : : };
712 : : #define to_usb_device(d) container_of(d, struct usb_device, dev)
713 : :
714 : 0 : static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf)
715 : : {
716 [ # # # # ]: 0 : return to_usb_device(intf->dev.parent);
717 : : }
718 : :
719 : : extern struct usb_device *usb_get_dev(struct usb_device *dev);
720 : : extern void usb_put_dev(struct usb_device *dev);
721 : : extern struct usb_device *usb_hub_find_child(struct usb_device *hdev,
722 : : int port1);
723 : :
724 : : /**
725 : : * usb_hub_for_each_child - iterate over all child devices on the hub
726 : : * @hdev: USB device belonging to the usb hub
727 : : * @port1: portnum associated with child device
728 : : * @child: child device pointer
729 : : */
730 : : #define usb_hub_for_each_child(hdev, port1, child) \
731 : : for (port1 = 1, child = usb_hub_find_child(hdev, port1); \
732 : : port1 <= hdev->maxchild; \
733 : : child = usb_hub_find_child(hdev, ++port1)) \
734 : : if (!child) continue; else
735 : :
736 : : /* USB device locking */
737 : : #define usb_lock_device(udev) device_lock(&(udev)->dev)
738 : : #define usb_unlock_device(udev) device_unlock(&(udev)->dev)
739 : : #define usb_lock_device_interruptible(udev) device_lock_interruptible(&(udev)->dev)
740 : : #define usb_trylock_device(udev) device_trylock(&(udev)->dev)
741 : : extern int usb_lock_device_for_reset(struct usb_device *udev,
742 : : const struct usb_interface *iface);
743 : :
744 : : /* USB port reset for device reinitialization */
745 : : extern int usb_reset_device(struct usb_device *dev);
746 : : extern void usb_queue_reset_device(struct usb_interface *dev);
747 : :
748 : : #ifdef CONFIG_ACPI
749 : : extern int usb_acpi_set_power_state(struct usb_device *hdev, int index,
750 : : bool enable);
751 : : extern bool usb_acpi_power_manageable(struct usb_device *hdev, int index);
752 : : #else
753 : : static inline int usb_acpi_set_power_state(struct usb_device *hdev, int index,
754 : : bool enable) { return 0; }
755 : : static inline bool usb_acpi_power_manageable(struct usb_device *hdev, int index)
756 : : { return true; }
757 : : #endif
758 : :
759 : : /* USB autosuspend and autoresume */
760 : : #ifdef CONFIG_PM
761 : : extern void usb_enable_autosuspend(struct usb_device *udev);
762 : : extern void usb_disable_autosuspend(struct usb_device *udev);
763 : :
764 : : extern int usb_autopm_get_interface(struct usb_interface *intf);
765 : : extern void usb_autopm_put_interface(struct usb_interface *intf);
766 : : extern int usb_autopm_get_interface_async(struct usb_interface *intf);
767 : : extern void usb_autopm_put_interface_async(struct usb_interface *intf);
768 : : extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf);
769 : : extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf);
770 : :
771 : 0 : static inline void usb_mark_last_busy(struct usb_device *udev)
772 : : {
773 : 0 : pm_runtime_mark_last_busy(&udev->dev);
774 : 0 : }
775 : :
776 : : #else
777 : :
778 : : static inline int usb_enable_autosuspend(struct usb_device *udev)
779 : : { return 0; }
780 : : static inline int usb_disable_autosuspend(struct usb_device *udev)
781 : : { return 0; }
782 : :
783 : : static inline int usb_autopm_get_interface(struct usb_interface *intf)
784 : : { return 0; }
785 : : static inline int usb_autopm_get_interface_async(struct usb_interface *intf)
786 : : { return 0; }
787 : :
788 : : static inline void usb_autopm_put_interface(struct usb_interface *intf)
789 : : { }
790 : : static inline void usb_autopm_put_interface_async(struct usb_interface *intf)
791 : : { }
792 : : static inline void usb_autopm_get_interface_no_resume(
793 : : struct usb_interface *intf)
794 : : { }
795 : : static inline void usb_autopm_put_interface_no_suspend(
796 : : struct usb_interface *intf)
797 : : { }
798 : : static inline void usb_mark_last_busy(struct usb_device *udev)
799 : : { }
800 : : #endif
801 : :
802 : : extern int usb_disable_lpm(struct usb_device *udev);
803 : : extern void usb_enable_lpm(struct usb_device *udev);
804 : : /* Same as above, but these functions lock/unlock the bandwidth_mutex. */
805 : : extern int usb_unlocked_disable_lpm(struct usb_device *udev);
806 : : extern void usb_unlocked_enable_lpm(struct usb_device *udev);
807 : :
808 : : extern int usb_disable_ltm(struct usb_device *udev);
809 : : extern void usb_enable_ltm(struct usb_device *udev);
810 : :
811 : 0 : static inline bool usb_device_supports_ltm(struct usb_device *udev)
812 : : {
813 [ # # # # : 0 : if (udev->speed < USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap)
# # # # #
# # # # #
# # # # #
# # # #
# ]
814 : : return false;
815 [ # # # # : 0 : return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT;
# # # # ]
816 : : }
817 : :
818 : : static inline bool usb_device_no_sg_constraint(struct usb_device *udev)
819 : : {
820 : : return udev && udev->bus && udev->bus->no_sg_constraint;
821 : : }
822 : :
823 : :
824 : : /*-------------------------------------------------------------------------*/
825 : :
826 : : /* for drivers using iso endpoints */
827 : : extern int usb_get_current_frame_number(struct usb_device *usb_dev);
828 : :
829 : : /* Sets up a group of bulk endpoints to support multiple stream IDs. */
830 : : extern int usb_alloc_streams(struct usb_interface *interface,
831 : : struct usb_host_endpoint **eps, unsigned int num_eps,
832 : : unsigned int num_streams, gfp_t mem_flags);
833 : :
834 : : /* Reverts a group of bulk endpoints back to not using stream IDs. */
835 : : extern int usb_free_streams(struct usb_interface *interface,
836 : : struct usb_host_endpoint **eps, unsigned int num_eps,
837 : : gfp_t mem_flags);
838 : :
839 : : /* used these for multi-interface device registration */
840 : : extern int usb_driver_claim_interface(struct usb_driver *driver,
841 : : struct usb_interface *iface, void *priv);
842 : :
843 : : /**
844 : : * usb_interface_claimed - returns true iff an interface is claimed
845 : : * @iface: the interface being checked
846 : : *
847 : : * Return: %true (nonzero) iff the interface is claimed, else %false
848 : : * (zero).
849 : : *
850 : : * Note:
851 : : * Callers must own the driver model's usb bus readlock. So driver
852 : : * probe() entries don't need extra locking, but other call contexts
853 : : * may need to explicitly claim that lock.
854 : : *
855 : : */
856 : 0 : static inline int usb_interface_claimed(struct usb_interface *iface)
857 : : {
858 [ # # ]: 0 : return (iface->dev.driver != NULL);
859 : : }
860 : :
861 : : extern void usb_driver_release_interface(struct usb_driver *driver,
862 : : struct usb_interface *iface);
863 : : const struct usb_device_id *usb_match_id(struct usb_interface *interface,
864 : : const struct usb_device_id *id);
865 : : extern int usb_match_one_id(struct usb_interface *interface,
866 : : const struct usb_device_id *id);
867 : :
868 : : extern int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *));
869 : : extern struct usb_interface *usb_find_interface(struct usb_driver *drv,
870 : : int minor);
871 : : extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev,
872 : : unsigned ifnum);
873 : : extern struct usb_host_interface *usb_altnum_to_altsetting(
874 : : const struct usb_interface *intf, unsigned int altnum);
875 : : extern struct usb_host_interface *usb_find_alt_setting(
876 : : struct usb_host_config *config,
877 : : unsigned int iface_num,
878 : : unsigned int alt_num);
879 : :
880 : : /* port claiming functions */
881 : : int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
882 : : struct usb_dev_state *owner);
883 : : int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
884 : : struct usb_dev_state *owner);
885 : :
886 : : /**
887 : : * usb_make_path - returns stable device path in the usb tree
888 : : * @dev: the device whose path is being constructed
889 : : * @buf: where to put the string
890 : : * @size: how big is "buf"?
891 : : *
892 : : * Return: Length of the string (> 0) or negative if size was too small.
893 : : *
894 : : * Note:
895 : : * This identifier is intended to be "stable", reflecting physical paths in
896 : : * hardware such as physical bus addresses for host controllers or ports on
897 : : * USB hubs. That makes it stay the same until systems are physically
898 : : * reconfigured, by re-cabling a tree of USB devices or by moving USB host
899 : : * controllers. Adding and removing devices, including virtual root hubs
900 : : * in host controller driver modules, does not change these path identifiers;
901 : : * neither does rebooting or re-enumerating. These are more useful identifiers
902 : : * than changeable ("unstable") ones like bus numbers or device addresses.
903 : : *
904 : : * With a partial exception for devices connected to USB 2.0 root hubs, these
905 : : * identifiers are also predictable. So long as the device tree isn't changed,
906 : : * plugging any USB device into a given hub port always gives it the same path.
907 : : * Because of the use of "companion" controllers, devices connected to ports on
908 : : * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are
909 : : * high speed, and a different one if they are full or low speed.
910 : : */
911 : 0 : static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size)
912 : : {
913 : 0 : int actual;
914 : 0 : actual = snprintf(buf, size, "usb-%s-%s", dev->bus->bus_name,
915 : 0 : dev->devpath);
916 : 0 : return (actual >= (int)size) ? -1 : actual;
917 : : }
918 : :
919 : : /*-------------------------------------------------------------------------*/
920 : :
921 : : #define USB_DEVICE_ID_MATCH_DEVICE \
922 : : (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT)
923 : : #define USB_DEVICE_ID_MATCH_DEV_RANGE \
924 : : (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI)
925 : : #define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
926 : : (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE)
927 : : #define USB_DEVICE_ID_MATCH_DEV_INFO \
928 : : (USB_DEVICE_ID_MATCH_DEV_CLASS | \
929 : : USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \
930 : : USB_DEVICE_ID_MATCH_DEV_PROTOCOL)
931 : : #define USB_DEVICE_ID_MATCH_INT_INFO \
932 : : (USB_DEVICE_ID_MATCH_INT_CLASS | \
933 : : USB_DEVICE_ID_MATCH_INT_SUBCLASS | \
934 : : USB_DEVICE_ID_MATCH_INT_PROTOCOL)
935 : :
936 : : /**
937 : : * USB_DEVICE - macro used to describe a specific usb device
938 : : * @vend: the 16 bit USB Vendor ID
939 : : * @prod: the 16 bit USB Product ID
940 : : *
941 : : * This macro is used to create a struct usb_device_id that matches a
942 : : * specific device.
943 : : */
944 : : #define USB_DEVICE(vend, prod) \
945 : : .match_flags = USB_DEVICE_ID_MATCH_DEVICE, \
946 : : .idVendor = (vend), \
947 : : .idProduct = (prod)
948 : : /**
949 : : * USB_DEVICE_VER - describe a specific usb device with a version range
950 : : * @vend: the 16 bit USB Vendor ID
951 : : * @prod: the 16 bit USB Product ID
952 : : * @lo: the bcdDevice_lo value
953 : : * @hi: the bcdDevice_hi value
954 : : *
955 : : * This macro is used to create a struct usb_device_id that matches a
956 : : * specific device, with a version range.
957 : : */
958 : : #define USB_DEVICE_VER(vend, prod, lo, hi) \
959 : : .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \
960 : : .idVendor = (vend), \
961 : : .idProduct = (prod), \
962 : : .bcdDevice_lo = (lo), \
963 : : .bcdDevice_hi = (hi)
964 : :
965 : : /**
966 : : * USB_DEVICE_INTERFACE_CLASS - describe a usb device with a specific interface class
967 : : * @vend: the 16 bit USB Vendor ID
968 : : * @prod: the 16 bit USB Product ID
969 : : * @cl: bInterfaceClass value
970 : : *
971 : : * This macro is used to create a struct usb_device_id that matches a
972 : : * specific interface class of devices.
973 : : */
974 : : #define USB_DEVICE_INTERFACE_CLASS(vend, prod, cl) \
975 : : .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
976 : : USB_DEVICE_ID_MATCH_INT_CLASS, \
977 : : .idVendor = (vend), \
978 : : .idProduct = (prod), \
979 : : .bInterfaceClass = (cl)
980 : :
981 : : /**
982 : : * USB_DEVICE_INTERFACE_PROTOCOL - describe a usb device with a specific interface protocol
983 : : * @vend: the 16 bit USB Vendor ID
984 : : * @prod: the 16 bit USB Product ID
985 : : * @pr: bInterfaceProtocol value
986 : : *
987 : : * This macro is used to create a struct usb_device_id that matches a
988 : : * specific interface protocol of devices.
989 : : */
990 : : #define USB_DEVICE_INTERFACE_PROTOCOL(vend, prod, pr) \
991 : : .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
992 : : USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
993 : : .idVendor = (vend), \
994 : : .idProduct = (prod), \
995 : : .bInterfaceProtocol = (pr)
996 : :
997 : : /**
998 : : * USB_DEVICE_INTERFACE_NUMBER - describe a usb device with a specific interface number
999 : : * @vend: the 16 bit USB Vendor ID
1000 : : * @prod: the 16 bit USB Product ID
1001 : : * @num: bInterfaceNumber value
1002 : : *
1003 : : * This macro is used to create a struct usb_device_id that matches a
1004 : : * specific interface number of devices.
1005 : : */
1006 : : #define USB_DEVICE_INTERFACE_NUMBER(vend, prod, num) \
1007 : : .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
1008 : : USB_DEVICE_ID_MATCH_INT_NUMBER, \
1009 : : .idVendor = (vend), \
1010 : : .idProduct = (prod), \
1011 : : .bInterfaceNumber = (num)
1012 : :
1013 : : /**
1014 : : * USB_DEVICE_INFO - macro used to describe a class of usb devices
1015 : : * @cl: bDeviceClass value
1016 : : * @sc: bDeviceSubClass value
1017 : : * @pr: bDeviceProtocol value
1018 : : *
1019 : : * This macro is used to create a struct usb_device_id that matches a
1020 : : * specific class of devices.
1021 : : */
1022 : : #define USB_DEVICE_INFO(cl, sc, pr) \
1023 : : .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, \
1024 : : .bDeviceClass = (cl), \
1025 : : .bDeviceSubClass = (sc), \
1026 : : .bDeviceProtocol = (pr)
1027 : :
1028 : : /**
1029 : : * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces
1030 : : * @cl: bInterfaceClass value
1031 : : * @sc: bInterfaceSubClass value
1032 : : * @pr: bInterfaceProtocol value
1033 : : *
1034 : : * This macro is used to create a struct usb_device_id that matches a
1035 : : * specific class of interfaces.
1036 : : */
1037 : : #define USB_INTERFACE_INFO(cl, sc, pr) \
1038 : : .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, \
1039 : : .bInterfaceClass = (cl), \
1040 : : .bInterfaceSubClass = (sc), \
1041 : : .bInterfaceProtocol = (pr)
1042 : :
1043 : : /**
1044 : : * USB_DEVICE_AND_INTERFACE_INFO - describe a specific usb device with a class of usb interfaces
1045 : : * @vend: the 16 bit USB Vendor ID
1046 : : * @prod: the 16 bit USB Product ID
1047 : : * @cl: bInterfaceClass value
1048 : : * @sc: bInterfaceSubClass value
1049 : : * @pr: bInterfaceProtocol value
1050 : : *
1051 : : * This macro is used to create a struct usb_device_id that matches a
1052 : : * specific device with a specific class of interfaces.
1053 : : *
1054 : : * This is especially useful when explicitly matching devices that have
1055 : : * vendor specific bDeviceClass values, but standards-compliant interfaces.
1056 : : */
1057 : : #define USB_DEVICE_AND_INTERFACE_INFO(vend, prod, cl, sc, pr) \
1058 : : .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \
1059 : : | USB_DEVICE_ID_MATCH_DEVICE, \
1060 : : .idVendor = (vend), \
1061 : : .idProduct = (prod), \
1062 : : .bInterfaceClass = (cl), \
1063 : : .bInterfaceSubClass = (sc), \
1064 : : .bInterfaceProtocol = (pr)
1065 : :
1066 : : /**
1067 : : * USB_VENDOR_AND_INTERFACE_INFO - describe a specific usb vendor with a class of usb interfaces
1068 : : * @vend: the 16 bit USB Vendor ID
1069 : : * @cl: bInterfaceClass value
1070 : : * @sc: bInterfaceSubClass value
1071 : : * @pr: bInterfaceProtocol value
1072 : : *
1073 : : * This macro is used to create a struct usb_device_id that matches a
1074 : : * specific vendor with a specific class of interfaces.
1075 : : *
1076 : : * This is especially useful when explicitly matching devices that have
1077 : : * vendor specific bDeviceClass values, but standards-compliant interfaces.
1078 : : */
1079 : : #define USB_VENDOR_AND_INTERFACE_INFO(vend, cl, sc, pr) \
1080 : : .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \
1081 : : | USB_DEVICE_ID_MATCH_VENDOR, \
1082 : : .idVendor = (vend), \
1083 : : .bInterfaceClass = (cl), \
1084 : : .bInterfaceSubClass = (sc), \
1085 : : .bInterfaceProtocol = (pr)
1086 : :
1087 : : /* ----------------------------------------------------------------------- */
1088 : :
1089 : : /* Stuff for dynamic usb ids */
1090 : : struct usb_dynids {
1091 : : spinlock_t lock;
1092 : : struct list_head list;
1093 : : };
1094 : :
1095 : : struct usb_dynid {
1096 : : struct list_head node;
1097 : : struct usb_device_id id;
1098 : : };
1099 : :
1100 : : extern ssize_t usb_store_new_id(struct usb_dynids *dynids,
1101 : : const struct usb_device_id *id_table,
1102 : : struct device_driver *driver,
1103 : : const char *buf, size_t count);
1104 : :
1105 : : extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf);
1106 : :
1107 : : /**
1108 : : * struct usbdrv_wrap - wrapper for driver-model structure
1109 : : * @driver: The driver-model core driver structure.
1110 : : * @for_devices: Non-zero for device drivers, 0 for interface drivers.
1111 : : */
1112 : : struct usbdrv_wrap {
1113 : : struct device_driver driver;
1114 : : int for_devices;
1115 : : };
1116 : :
1117 : : /**
1118 : : * struct usb_driver - identifies USB interface driver to usbcore
1119 : : * @name: The driver name should be unique among USB drivers,
1120 : : * and should normally be the same as the module name.
1121 : : * @probe: Called to see if the driver is willing to manage a particular
1122 : : * interface on a device. If it is, probe returns zero and uses
1123 : : * usb_set_intfdata() to associate driver-specific data with the
1124 : : * interface. It may also use usb_set_interface() to specify the
1125 : : * appropriate altsetting. If unwilling to manage the interface,
1126 : : * return -ENODEV, if genuine IO errors occurred, an appropriate
1127 : : * negative errno value.
1128 : : * @disconnect: Called when the interface is no longer accessible, usually
1129 : : * because its device has been (or is being) disconnected or the
1130 : : * driver module is being unloaded.
1131 : : * @unlocked_ioctl: Used for drivers that want to talk to userspace through
1132 : : * the "usbfs" filesystem. This lets devices provide ways to
1133 : : * expose information to user space regardless of where they
1134 : : * do (or don't) show up otherwise in the filesystem.
1135 : : * @suspend: Called when the device is going to be suspended by the
1136 : : * system either from system sleep or runtime suspend context. The
1137 : : * return value will be ignored in system sleep context, so do NOT
1138 : : * try to continue using the device if suspend fails in this case.
1139 : : * Instead, let the resume or reset-resume routine recover from
1140 : : * the failure.
1141 : : * @resume: Called when the device is being resumed by the system.
1142 : : * @reset_resume: Called when the suspended device has been reset instead
1143 : : * of being resumed.
1144 : : * @pre_reset: Called by usb_reset_device() when the device is about to be
1145 : : * reset. This routine must not return until the driver has no active
1146 : : * URBs for the device, and no more URBs may be submitted until the
1147 : : * post_reset method is called.
1148 : : * @post_reset: Called by usb_reset_device() after the device
1149 : : * has been reset
1150 : : * @id_table: USB drivers use ID table to support hotplugging.
1151 : : * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
1152 : : * or your driver's probe function will never get called.
1153 : : * @dev_groups: Attributes attached to the device that will be created once it
1154 : : * is bound to the driver.
1155 : : * @dynids: used internally to hold the list of dynamically added device
1156 : : * ids for this driver.
1157 : : * @drvwrap: Driver-model core structure wrapper.
1158 : : * @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be
1159 : : * added to this driver by preventing the sysfs file from being created.
1160 : : * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend
1161 : : * for interfaces bound to this driver.
1162 : : * @soft_unbind: if set to 1, the USB core will not kill URBs and disable
1163 : : * endpoints before calling the driver's disconnect method.
1164 : : * @disable_hub_initiated_lpm: if set to 1, the USB core will not allow hubs
1165 : : * to initiate lower power link state transitions when an idle timeout
1166 : : * occurs. Device-initiated USB 3.0 link PM will still be allowed.
1167 : : *
1168 : : * USB interface drivers must provide a name, probe() and disconnect()
1169 : : * methods, and an id_table. Other driver fields are optional.
1170 : : *
1171 : : * The id_table is used in hotplugging. It holds a set of descriptors,
1172 : : * and specialized data may be associated with each entry. That table
1173 : : * is used by both user and kernel mode hotplugging support.
1174 : : *
1175 : : * The probe() and disconnect() methods are called in a context where
1176 : : * they can sleep, but they should avoid abusing the privilege. Most
1177 : : * work to connect to a device should be done when the device is opened,
1178 : : * and undone at the last close. The disconnect code needs to address
1179 : : * concurrency issues with respect to open() and close() methods, as
1180 : : * well as forcing all pending I/O requests to complete (by unlinking
1181 : : * them as necessary, and blocking until the unlinks complete).
1182 : : */
1183 : : struct usb_driver {
1184 : : const char *name;
1185 : :
1186 : : int (*probe) (struct usb_interface *intf,
1187 : : const struct usb_device_id *id);
1188 : :
1189 : : void (*disconnect) (struct usb_interface *intf);
1190 : :
1191 : : int (*unlocked_ioctl) (struct usb_interface *intf, unsigned int code,
1192 : : void *buf);
1193 : :
1194 : : int (*suspend) (struct usb_interface *intf, pm_message_t message);
1195 : : int (*resume) (struct usb_interface *intf);
1196 : : int (*reset_resume)(struct usb_interface *intf);
1197 : :
1198 : : int (*pre_reset)(struct usb_interface *intf);
1199 : : int (*post_reset)(struct usb_interface *intf);
1200 : :
1201 : : const struct usb_device_id *id_table;
1202 : : const struct attribute_group **dev_groups;
1203 : :
1204 : : struct usb_dynids dynids;
1205 : : struct usbdrv_wrap drvwrap;
1206 : : unsigned int no_dynamic_id:1;
1207 : : unsigned int supports_autosuspend:1;
1208 : : unsigned int disable_hub_initiated_lpm:1;
1209 : : unsigned int soft_unbind:1;
1210 : : };
1211 : : #define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver)
1212 : :
1213 : : /**
1214 : : * struct usb_device_driver - identifies USB device driver to usbcore
1215 : : * @name: The driver name should be unique among USB drivers,
1216 : : * and should normally be the same as the module name.
1217 : : * @probe: Called to see if the driver is willing to manage a particular
1218 : : * device. If it is, probe returns zero and uses dev_set_drvdata()
1219 : : * to associate driver-specific data with the device. If unwilling
1220 : : * to manage the device, return a negative errno value.
1221 : : * @disconnect: Called when the device is no longer accessible, usually
1222 : : * because it has been (or is being) disconnected or the driver's
1223 : : * module is being unloaded.
1224 : : * @suspend: Called when the device is going to be suspended by the system.
1225 : : * @resume: Called when the device is being resumed by the system.
1226 : : * @dev_groups: Attributes attached to the device that will be created once it
1227 : : * is bound to the driver.
1228 : : * @drvwrap: Driver-model core structure wrapper.
1229 : : * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend
1230 : : * for devices bound to this driver.
1231 : : *
1232 : : * USB drivers must provide all the fields listed above except drvwrap.
1233 : : */
1234 : : struct usb_device_driver {
1235 : : const char *name;
1236 : :
1237 : : int (*probe) (struct usb_device *udev);
1238 : : void (*disconnect) (struct usb_device *udev);
1239 : :
1240 : : int (*suspend) (struct usb_device *udev, pm_message_t message);
1241 : : int (*resume) (struct usb_device *udev, pm_message_t message);
1242 : : const struct attribute_group **dev_groups;
1243 : : struct usbdrv_wrap drvwrap;
1244 : : unsigned int supports_autosuspend:1;
1245 : : };
1246 : : #define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \
1247 : : drvwrap.driver)
1248 : :
1249 : : extern struct bus_type usb_bus_type;
1250 : :
1251 : : /**
1252 : : * struct usb_class_driver - identifies a USB driver that wants to use the USB major number
1253 : : * @name: the usb class device name for this driver. Will show up in sysfs.
1254 : : * @devnode: Callback to provide a naming hint for a possible
1255 : : * device node to create.
1256 : : * @fops: pointer to the struct file_operations of this driver.
1257 : : * @minor_base: the start of the minor range for this driver.
1258 : : *
1259 : : * This structure is used for the usb_register_dev() and
1260 : : * usb_deregister_dev() functions, to consolidate a number of the
1261 : : * parameters used for them.
1262 : : */
1263 : : struct usb_class_driver {
1264 : : char *name;
1265 : : char *(*devnode)(struct device *dev, umode_t *mode);
1266 : : const struct file_operations *fops;
1267 : : int minor_base;
1268 : : };
1269 : :
1270 : : /*
1271 : : * use these in module_init()/module_exit()
1272 : : * and don't forget MODULE_DEVICE_TABLE(usb, ...)
1273 : : */
1274 : : extern int usb_register_driver(struct usb_driver *, struct module *,
1275 : : const char *);
1276 : :
1277 : : /* use a define to avoid include chaining to get THIS_MODULE & friends */
1278 : : #define usb_register(driver) \
1279 : : usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
1280 : :
1281 : : extern void usb_deregister(struct usb_driver *);
1282 : :
1283 : : /**
1284 : : * module_usb_driver() - Helper macro for registering a USB driver
1285 : : * @__usb_driver: usb_driver struct
1286 : : *
1287 : : * Helper macro for USB drivers which do not do anything special in module
1288 : : * init/exit. This eliminates a lot of boilerplate. Each module may only
1289 : : * use this macro once, and calling it replaces module_init() and module_exit()
1290 : : */
1291 : : #define module_usb_driver(__usb_driver) \
1292 : : module_driver(__usb_driver, usb_register, \
1293 : : usb_deregister)
1294 : :
1295 : : extern int usb_register_device_driver(struct usb_device_driver *,
1296 : : struct module *);
1297 : : extern void usb_deregister_device_driver(struct usb_device_driver *);
1298 : :
1299 : : extern int usb_register_dev(struct usb_interface *intf,
1300 : : struct usb_class_driver *class_driver);
1301 : : extern void usb_deregister_dev(struct usb_interface *intf,
1302 : : struct usb_class_driver *class_driver);
1303 : :
1304 : : extern int usb_disabled(void);
1305 : :
1306 : : /* ----------------------------------------------------------------------- */
1307 : :
1308 : : /*
1309 : : * URB support, for asynchronous request completions
1310 : : */
1311 : :
1312 : : /*
1313 : : * urb->transfer_flags:
1314 : : *
1315 : : * Note: URB_DIR_IN/OUT is automatically set in usb_submit_urb().
1316 : : */
1317 : : #define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */
1318 : : #define URB_ISO_ASAP 0x0002 /* iso-only; use the first unexpired
1319 : : * slot in the schedule */
1320 : : #define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */
1321 : : #define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */
1322 : : #define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt
1323 : : * needed */
1324 : : #define URB_FREE_BUFFER 0x0100 /* Free transfer buffer with the URB */
1325 : :
1326 : : /* The following flags are used internally by usbcore and HCDs */
1327 : : #define URB_DIR_IN 0x0200 /* Transfer from device to host */
1328 : : #define URB_DIR_OUT 0
1329 : : #define URB_DIR_MASK URB_DIR_IN
1330 : :
1331 : : #define URB_DMA_MAP_SINGLE 0x00010000 /* Non-scatter-gather mapping */
1332 : : #define URB_DMA_MAP_PAGE 0x00020000 /* HCD-unsupported S-G */
1333 : : #define URB_DMA_MAP_SG 0x00040000 /* HCD-supported S-G */
1334 : : #define URB_MAP_LOCAL 0x00080000 /* HCD-local-memory mapping */
1335 : : #define URB_SETUP_MAP_SINGLE 0x00100000 /* Setup packet DMA mapped */
1336 : : #define URB_SETUP_MAP_LOCAL 0x00200000 /* HCD-local setup packet */
1337 : : #define URB_DMA_SG_COMBINED 0x00400000 /* S-G entries were combined */
1338 : : #define URB_ALIGNED_TEMP_BUFFER 0x00800000 /* Temp buffer was alloc'd */
1339 : :
1340 : : struct usb_iso_packet_descriptor {
1341 : : unsigned int offset;
1342 : : unsigned int length; /* expected length */
1343 : : unsigned int actual_length;
1344 : : int status;
1345 : : };
1346 : :
1347 : : struct urb;
1348 : :
1349 : : struct usb_anchor {
1350 : : struct list_head urb_list;
1351 : : wait_queue_head_t wait;
1352 : : spinlock_t lock;
1353 : : atomic_t suspend_wakeups;
1354 : : unsigned int poisoned:1;
1355 : : };
1356 : :
1357 : 0 : static inline void init_usb_anchor(struct usb_anchor *anchor)
1358 : : {
1359 : 0 : memset(anchor, 0, sizeof(*anchor));
1360 : 0 : INIT_LIST_HEAD(&anchor->urb_list);
1361 : 0 : init_waitqueue_head(&anchor->wait);
1362 : 0 : spin_lock_init(&anchor->lock);
1363 : 0 : }
1364 : :
1365 : : typedef void (*usb_complete_t)(struct urb *);
1366 : :
1367 : : /**
1368 : : * struct urb - USB Request Block
1369 : : * @urb_list: For use by current owner of the URB.
1370 : : * @anchor_list: membership in the list of an anchor
1371 : : * @anchor: to anchor URBs to a common mooring
1372 : : * @ep: Points to the endpoint's data structure. Will eventually
1373 : : * replace @pipe.
1374 : : * @pipe: Holds endpoint number, direction, type, and more.
1375 : : * Create these values with the eight macros available;
1376 : : * usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl"
1377 : : * (control), "bulk", "int" (interrupt), or "iso" (isochronous).
1378 : : * For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint
1379 : : * numbers range from zero to fifteen. Note that "in" endpoint two
1380 : : * is a different endpoint (and pipe) from "out" endpoint two.
1381 : : * The current configuration controls the existence, type, and
1382 : : * maximum packet size of any given endpoint.
1383 : : * @stream_id: the endpoint's stream ID for bulk streams
1384 : : * @dev: Identifies the USB device to perform the request.
1385 : : * @status: This is read in non-iso completion functions to get the
1386 : : * status of the particular request. ISO requests only use it
1387 : : * to tell whether the URB was unlinked; detailed status for
1388 : : * each frame is in the fields of the iso_frame-desc.
1389 : : * @transfer_flags: A variety of flags may be used to affect how URB
1390 : : * submission, unlinking, or operation are handled. Different
1391 : : * kinds of URB can use different flags.
1392 : : * @transfer_buffer: This identifies the buffer to (or from) which the I/O
1393 : : * request will be performed unless URB_NO_TRANSFER_DMA_MAP is set
1394 : : * (however, do not leave garbage in transfer_buffer even then).
1395 : : * This buffer must be suitable for DMA; allocate it with
1396 : : * kmalloc() or equivalent. For transfers to "in" endpoints, contents
1397 : : * of this buffer will be modified. This buffer is used for the data
1398 : : * stage of control transfers.
1399 : : * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP,
1400 : : * the device driver is saying that it provided this DMA address,
1401 : : * which the host controller driver should use in preference to the
1402 : : * transfer_buffer.
1403 : : * @sg: scatter gather buffer list, the buffer size of each element in
1404 : : * the list (except the last) must be divisible by the endpoint's
1405 : : * max packet size if no_sg_constraint isn't set in 'struct usb_bus'
1406 : : * @num_mapped_sgs: (internal) number of mapped sg entries
1407 : : * @num_sgs: number of entries in the sg list
1408 : : * @transfer_buffer_length: How big is transfer_buffer. The transfer may
1409 : : * be broken up into chunks according to the current maximum packet
1410 : : * size for the endpoint, which is a function of the configuration
1411 : : * and is encoded in the pipe. When the length is zero, neither
1412 : : * transfer_buffer nor transfer_dma is used.
1413 : : * @actual_length: This is read in non-iso completion functions, and
1414 : : * it tells how many bytes (out of transfer_buffer_length) were
1415 : : * transferred. It will normally be the same as requested, unless
1416 : : * either an error was reported or a short read was performed.
1417 : : * The URB_SHORT_NOT_OK transfer flag may be used to make such
1418 : : * short reads be reported as errors.
1419 : : * @setup_packet: Only used for control transfers, this points to eight bytes
1420 : : * of setup data. Control transfers always start by sending this data
1421 : : * to the device. Then transfer_buffer is read or written, if needed.
1422 : : * @setup_dma: DMA pointer for the setup packet. The caller must not use
1423 : : * this field; setup_packet must point to a valid buffer.
1424 : : * @start_frame: Returns the initial frame for isochronous transfers.
1425 : : * @number_of_packets: Lists the number of ISO transfer buffers.
1426 : : * @interval: Specifies the polling interval for interrupt or isochronous
1427 : : * transfers. The units are frames (milliseconds) for full and low
1428 : : * speed devices, and microframes (1/8 millisecond) for highspeed
1429 : : * and SuperSpeed devices.
1430 : : * @error_count: Returns the number of ISO transfers that reported errors.
1431 : : * @context: For use in completion functions. This normally points to
1432 : : * request-specific driver context.
1433 : : * @complete: Completion handler. This URB is passed as the parameter to the
1434 : : * completion function. The completion function may then do what
1435 : : * it likes with the URB, including resubmitting or freeing it.
1436 : : * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to
1437 : : * collect the transfer status for each buffer.
1438 : : *
1439 : : * This structure identifies USB transfer requests. URBs must be allocated by
1440 : : * calling usb_alloc_urb() and freed with a call to usb_free_urb().
1441 : : * Initialization may be done using various usb_fill_*_urb() functions. URBs
1442 : : * are submitted using usb_submit_urb(), and pending requests may be canceled
1443 : : * using usb_unlink_urb() or usb_kill_urb().
1444 : : *
1445 : : * Data Transfer Buffers:
1446 : : *
1447 : : * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise
1448 : : * taken from the general page pool. That is provided by transfer_buffer
1449 : : * (control requests also use setup_packet), and host controller drivers
1450 : : * perform a dma mapping (and unmapping) for each buffer transferred. Those
1451 : : * mapping operations can be expensive on some platforms (perhaps using a dma
1452 : : * bounce buffer or talking to an IOMMU),
1453 : : * although they're cheap on commodity x86 and ppc hardware.
1454 : : *
1455 : : * Alternatively, drivers may pass the URB_NO_TRANSFER_DMA_MAP transfer flag,
1456 : : * which tells the host controller driver that no such mapping is needed for
1457 : : * the transfer_buffer since
1458 : : * the device driver is DMA-aware. For example, a device driver might
1459 : : * allocate a DMA buffer with usb_alloc_coherent() or call usb_buffer_map().
1460 : : * When this transfer flag is provided, host controller drivers will
1461 : : * attempt to use the dma address found in the transfer_dma
1462 : : * field rather than determining a dma address themselves.
1463 : : *
1464 : : * Note that transfer_buffer must still be set if the controller
1465 : : * does not support DMA (as indicated by hcd_uses_dma()) and when talking
1466 : : * to root hub. If you have to trasfer between highmem zone and the device
1467 : : * on such controller, create a bounce buffer or bail out with an error.
1468 : : * If transfer_buffer cannot be set (is in highmem) and the controller is DMA
1469 : : * capable, assign NULL to it, so that usbmon knows not to use the value.
1470 : : * The setup_packet must always be set, so it cannot be located in highmem.
1471 : : *
1472 : : * Initialization:
1473 : : *
1474 : : * All URBs submitted must initialize the dev, pipe, transfer_flags (may be
1475 : : * zero), and complete fields. All URBs must also initialize
1476 : : * transfer_buffer and transfer_buffer_length. They may provide the
1477 : : * URB_SHORT_NOT_OK transfer flag, indicating that short reads are
1478 : : * to be treated as errors; that flag is invalid for write requests.
1479 : : *
1480 : : * Bulk URBs may
1481 : : * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers
1482 : : * should always terminate with a short packet, even if it means adding an
1483 : : * extra zero length packet.
1484 : : *
1485 : : * Control URBs must provide a valid pointer in the setup_packet field.
1486 : : * Unlike the transfer_buffer, the setup_packet may not be mapped for DMA
1487 : : * beforehand.
1488 : : *
1489 : : * Interrupt URBs must provide an interval, saying how often (in milliseconds
1490 : : * or, for highspeed devices, 125 microsecond units)
1491 : : * to poll for transfers. After the URB has been submitted, the interval
1492 : : * field reflects how the transfer was actually scheduled.
1493 : : * The polling interval may be more frequent than requested.
1494 : : * For example, some controllers have a maximum interval of 32 milliseconds,
1495 : : * while others support intervals of up to 1024 milliseconds.
1496 : : * Isochronous URBs also have transfer intervals. (Note that for isochronous
1497 : : * endpoints, as well as high speed interrupt endpoints, the encoding of
1498 : : * the transfer interval in the endpoint descriptor is logarithmic.
1499 : : * Device drivers must convert that value to linear units themselves.)
1500 : : *
1501 : : * If an isochronous endpoint queue isn't already running, the host
1502 : : * controller will schedule a new URB to start as soon as bandwidth
1503 : : * utilization allows. If the queue is running then a new URB will be
1504 : : * scheduled to start in the first transfer slot following the end of the
1505 : : * preceding URB, if that slot has not already expired. If the slot has
1506 : : * expired (which can happen when IRQ delivery is delayed for a long time),
1507 : : * the scheduling behavior depends on the URB_ISO_ASAP flag. If the flag
1508 : : * is clear then the URB will be scheduled to start in the expired slot,
1509 : : * implying that some of its packets will not be transferred; if the flag
1510 : : * is set then the URB will be scheduled in the first unexpired slot,
1511 : : * breaking the queue's synchronization. Upon URB completion, the
1512 : : * start_frame field will be set to the (micro)frame number in which the
1513 : : * transfer was scheduled. Ranges for frame counter values are HC-specific
1514 : : * and can go from as low as 256 to as high as 65536 frames.
1515 : : *
1516 : : * Isochronous URBs have a different data transfer model, in part because
1517 : : * the quality of service is only "best effort". Callers provide specially
1518 : : * allocated URBs, with number_of_packets worth of iso_frame_desc structures
1519 : : * at the end. Each such packet is an individual ISO transfer. Isochronous
1520 : : * URBs are normally queued, submitted by drivers to arrange that
1521 : : * transfers are at least double buffered, and then explicitly resubmitted
1522 : : * in completion handlers, so
1523 : : * that data (such as audio or video) streams at as constant a rate as the
1524 : : * host controller scheduler can support.
1525 : : *
1526 : : * Completion Callbacks:
1527 : : *
1528 : : * The completion callback is made in_interrupt(), and one of the first
1529 : : * things that a completion handler should do is check the status field.
1530 : : * The status field is provided for all URBs. It is used to report
1531 : : * unlinked URBs, and status for all non-ISO transfers. It should not
1532 : : * be examined before the URB is returned to the completion handler.
1533 : : *
1534 : : * The context field is normally used to link URBs back to the relevant
1535 : : * driver or request state.
1536 : : *
1537 : : * When the completion callback is invoked for non-isochronous URBs, the
1538 : : * actual_length field tells how many bytes were transferred. This field
1539 : : * is updated even when the URB terminated with an error or was unlinked.
1540 : : *
1541 : : * ISO transfer status is reported in the status and actual_length fields
1542 : : * of the iso_frame_desc array, and the number of errors is reported in
1543 : : * error_count. Completion callbacks for ISO transfers will normally
1544 : : * (re)submit URBs to ensure a constant transfer rate.
1545 : : *
1546 : : * Note that even fields marked "public" should not be touched by the driver
1547 : : * when the urb is owned by the hcd, that is, since the call to
1548 : : * usb_submit_urb() till the entry into the completion routine.
1549 : : */
1550 : : struct urb {
1551 : : /* private: usb core and host controller only fields in the urb */
1552 : : struct kref kref; /* reference count of the URB */
1553 : : int unlinked; /* unlink error code */
1554 : : void *hcpriv; /* private data for host controller */
1555 : : atomic_t use_count; /* concurrent submissions counter */
1556 : : atomic_t reject; /* submissions will fail */
1557 : :
1558 : : /* public: documented fields in the urb that can be used by drivers */
1559 : : struct list_head urb_list; /* list head for use by the urb's
1560 : : * current owner */
1561 : : struct list_head anchor_list; /* the URB may be anchored */
1562 : : struct usb_anchor *anchor;
1563 : : struct usb_device *dev; /* (in) pointer to associated device */
1564 : : struct usb_host_endpoint *ep; /* (internal) pointer to endpoint */
1565 : : unsigned int pipe; /* (in) pipe information */
1566 : : unsigned int stream_id; /* (in) stream ID */
1567 : : int status; /* (return) non-ISO status */
1568 : : unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/
1569 : : void *transfer_buffer; /* (in) associated data buffer */
1570 : : dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */
1571 : : struct scatterlist *sg; /* (in) scatter gather buffer list */
1572 : : int num_mapped_sgs; /* (internal) mapped sg entries */
1573 : : int num_sgs; /* (in) number of entries in the sg list */
1574 : : u32 transfer_buffer_length; /* (in) data buffer length */
1575 : : u32 actual_length; /* (return) actual transfer length */
1576 : : unsigned char *setup_packet; /* (in) setup packet (control only) */
1577 : : dma_addr_t setup_dma; /* (in) dma addr for setup_packet */
1578 : : int start_frame; /* (modify) start frame (ISO) */
1579 : : int number_of_packets; /* (in) number of ISO packets */
1580 : : int interval; /* (modify) transfer interval
1581 : : * (INT/ISO) */
1582 : : int error_count; /* (return) number of ISO errors */
1583 : : void *context; /* (in) context for completion */
1584 : : usb_complete_t complete; /* (in) completion routine */
1585 : : struct usb_iso_packet_descriptor iso_frame_desc[0];
1586 : : /* (in) ISO ONLY */
1587 : : };
1588 : :
1589 : : /* ----------------------------------------------------------------------- */
1590 : :
1591 : : /**
1592 : : * usb_fill_control_urb - initializes a control urb
1593 : : * @urb: pointer to the urb to initialize.
1594 : : * @dev: pointer to the struct usb_device for this urb.
1595 : : * @pipe: the endpoint pipe
1596 : : * @setup_packet: pointer to the setup_packet buffer
1597 : : * @transfer_buffer: pointer to the transfer buffer
1598 : : * @buffer_length: length of the transfer buffer
1599 : : * @complete_fn: pointer to the usb_complete_t function
1600 : : * @context: what to set the urb context to.
1601 : : *
1602 : : * Initializes a control urb with the proper information needed to submit
1603 : : * it to a device.
1604 : : */
1605 : 0 : static inline void usb_fill_control_urb(struct urb *urb,
1606 : : struct usb_device *dev,
1607 : : unsigned int pipe,
1608 : : unsigned char *setup_packet,
1609 : : void *transfer_buffer,
1610 : : int buffer_length,
1611 : : usb_complete_t complete_fn,
1612 : : void *context)
1613 : : {
1614 : 0 : urb->dev = dev;
1615 : 0 : urb->pipe = pipe;
1616 : 0 : urb->setup_packet = setup_packet;
1617 : 0 : urb->transfer_buffer = transfer_buffer;
1618 : 0 : urb->transfer_buffer_length = buffer_length;
1619 : 0 : urb->complete = complete_fn;
1620 : 0 : urb->context = context;
1621 : : }
1622 : :
1623 : : /**
1624 : : * usb_fill_bulk_urb - macro to help initialize a bulk urb
1625 : : * @urb: pointer to the urb to initialize.
1626 : : * @dev: pointer to the struct usb_device for this urb.
1627 : : * @pipe: the endpoint pipe
1628 : : * @transfer_buffer: pointer to the transfer buffer
1629 : : * @buffer_length: length of the transfer buffer
1630 : : * @complete_fn: pointer to the usb_complete_t function
1631 : : * @context: what to set the urb context to.
1632 : : *
1633 : : * Initializes a bulk urb with the proper information needed to submit it
1634 : : * to a device.
1635 : : */
1636 : 0 : static inline void usb_fill_bulk_urb(struct urb *urb,
1637 : : struct usb_device *dev,
1638 : : unsigned int pipe,
1639 : : void *transfer_buffer,
1640 : : int buffer_length,
1641 : : usb_complete_t complete_fn,
1642 : : void *context)
1643 : : {
1644 : 0 : urb->dev = dev;
1645 : 0 : urb->pipe = pipe;
1646 : 0 : urb->transfer_buffer = transfer_buffer;
1647 : 0 : urb->transfer_buffer_length = buffer_length;
1648 : 0 : urb->complete = complete_fn;
1649 : 0 : urb->context = context;
1650 : 0 : }
1651 : :
1652 : : /**
1653 : : * usb_fill_int_urb - macro to help initialize a interrupt urb
1654 : : * @urb: pointer to the urb to initialize.
1655 : : * @dev: pointer to the struct usb_device for this urb.
1656 : : * @pipe: the endpoint pipe
1657 : : * @transfer_buffer: pointer to the transfer buffer
1658 : : * @buffer_length: length of the transfer buffer
1659 : : * @complete_fn: pointer to the usb_complete_t function
1660 : : * @context: what to set the urb context to.
1661 : : * @interval: what to set the urb interval to, encoded like
1662 : : * the endpoint descriptor's bInterval value.
1663 : : *
1664 : : * Initializes a interrupt urb with the proper information needed to submit
1665 : : * it to a device.
1666 : : *
1667 : : * Note that High Speed and SuperSpeed(+) interrupt endpoints use a logarithmic
1668 : : * encoding of the endpoint interval, and express polling intervals in
1669 : : * microframes (eight per millisecond) rather than in frames (one per
1670 : : * millisecond).
1671 : : *
1672 : : * Wireless USB also uses the logarithmic encoding, but specifies it in units of
1673 : : * 128us instead of 125us. For Wireless USB devices, the interval is passed
1674 : : * through to the host controller, rather than being translated into microframe
1675 : : * units.
1676 : : */
1677 : 0 : static inline void usb_fill_int_urb(struct urb *urb,
1678 : : struct usb_device *dev,
1679 : : unsigned int pipe,
1680 : : void *transfer_buffer,
1681 : : int buffer_length,
1682 : : usb_complete_t complete_fn,
1683 : : void *context,
1684 : : int interval)
1685 : : {
1686 : 0 : urb->dev = dev;
1687 : 0 : urb->pipe = pipe;
1688 : 0 : urb->transfer_buffer = transfer_buffer;
1689 : 0 : urb->transfer_buffer_length = buffer_length;
1690 : 0 : urb->complete = complete_fn;
1691 : 0 : urb->context = context;
1692 : :
1693 [ # # # # ]: 0 : if (dev->speed == USB_SPEED_HIGH || dev->speed >= USB_SPEED_SUPER) {
1694 : : /* make sure interval is within allowed range */
1695 : 0 : interval = clamp(interval, 1, 16);
1696 : :
1697 : 0 : urb->interval = 1 << (interval - 1);
1698 : : } else {
1699 : 0 : urb->interval = interval;
1700 : : }
1701 : :
1702 : 0 : urb->start_frame = -1;
1703 : 0 : }
1704 : :
1705 : : extern void usb_init_urb(struct urb *urb);
1706 : : extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags);
1707 : : extern void usb_free_urb(struct urb *urb);
1708 : : #define usb_put_urb usb_free_urb
1709 : : extern struct urb *usb_get_urb(struct urb *urb);
1710 : : extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags);
1711 : : extern int usb_unlink_urb(struct urb *urb);
1712 : : extern void usb_kill_urb(struct urb *urb);
1713 : : extern void usb_poison_urb(struct urb *urb);
1714 : : extern void usb_unpoison_urb(struct urb *urb);
1715 : : extern void usb_block_urb(struct urb *urb);
1716 : : extern void usb_kill_anchored_urbs(struct usb_anchor *anchor);
1717 : : extern void usb_poison_anchored_urbs(struct usb_anchor *anchor);
1718 : : extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor);
1719 : : extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor);
1720 : : extern void usb_anchor_suspend_wakeups(struct usb_anchor *anchor);
1721 : : extern void usb_anchor_resume_wakeups(struct usb_anchor *anchor);
1722 : : extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);
1723 : : extern void usb_unanchor_urb(struct urb *urb);
1724 : : extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor,
1725 : : unsigned int timeout);
1726 : : extern struct urb *usb_get_from_anchor(struct usb_anchor *anchor);
1727 : : extern void usb_scuttle_anchored_urbs(struct usb_anchor *anchor);
1728 : : extern int usb_anchor_empty(struct usb_anchor *anchor);
1729 : :
1730 : : #define usb_unblock_urb usb_unpoison_urb
1731 : :
1732 : : /**
1733 : : * usb_urb_dir_in - check if an URB describes an IN transfer
1734 : : * @urb: URB to be checked
1735 : : *
1736 : : * Return: 1 if @urb describes an IN transfer (device-to-host),
1737 : : * otherwise 0.
1738 : : */
1739 : 0 : static inline int usb_urb_dir_in(struct urb *urb)
1740 : : {
1741 [ # # # # : 0 : return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN;
# # ]
1742 : : }
1743 : :
1744 : : /**
1745 : : * usb_urb_dir_out - check if an URB describes an OUT transfer
1746 : : * @urb: URB to be checked
1747 : : *
1748 : : * Return: 1 if @urb describes an OUT transfer (host-to-device),
1749 : : * otherwise 0.
1750 : : */
1751 : 0 : static inline int usb_urb_dir_out(struct urb *urb)
1752 : : {
1753 [ # # # # ]: 0 : return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_OUT;
1754 : : }
1755 : :
1756 : : int usb_urb_ep_type_check(const struct urb *urb);
1757 : :
1758 : : void *usb_alloc_coherent(struct usb_device *dev, size_t size,
1759 : : gfp_t mem_flags, dma_addr_t *dma);
1760 : : void usb_free_coherent(struct usb_device *dev, size_t size,
1761 : : void *addr, dma_addr_t dma);
1762 : :
1763 : : #if 0
1764 : : struct urb *usb_buffer_map(struct urb *urb);
1765 : : void usb_buffer_dmasync(struct urb *urb);
1766 : : void usb_buffer_unmap(struct urb *urb);
1767 : : #endif
1768 : :
1769 : : struct scatterlist;
1770 : : int usb_buffer_map_sg(const struct usb_device *dev, int is_in,
1771 : : struct scatterlist *sg, int nents);
1772 : : #if 0
1773 : : void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,
1774 : : struct scatterlist *sg, int n_hw_ents);
1775 : : #endif
1776 : : void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in,
1777 : : struct scatterlist *sg, int n_hw_ents);
1778 : :
1779 : : /*-------------------------------------------------------------------*
1780 : : * SYNCHRONOUS CALL SUPPORT *
1781 : : *-------------------------------------------------------------------*/
1782 : :
1783 : : extern int usb_control_msg(struct usb_device *dev, unsigned int pipe,
1784 : : __u8 request, __u8 requesttype, __u16 value, __u16 index,
1785 : : void *data, __u16 size, int timeout);
1786 : : extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe,
1787 : : void *data, int len, int *actual_length, int timeout);
1788 : : extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe,
1789 : : void *data, int len, int *actual_length,
1790 : : int timeout);
1791 : :
1792 : : /* wrappers around usb_control_msg() for the most common standard requests */
1793 : : extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype,
1794 : : unsigned char descindex, void *buf, int size);
1795 : : extern int usb_get_status(struct usb_device *dev,
1796 : : int recip, int type, int target, void *data);
1797 : :
1798 : 0 : static inline int usb_get_std_status(struct usb_device *dev,
1799 : : int recip, int target, void *data)
1800 : : {
1801 : 0 : return usb_get_status(dev, recip, USB_STATUS_TYPE_STANDARD, target,
1802 : : data);
1803 : : }
1804 : :
1805 : : static inline int usb_get_ptm_status(struct usb_device *dev, void *data)
1806 : : {
1807 : : return usb_get_status(dev, USB_RECIP_DEVICE, USB_STATUS_TYPE_PTM,
1808 : : 0, data);
1809 : : }
1810 : :
1811 : : extern int usb_string(struct usb_device *dev, int index,
1812 : : char *buf, size_t size);
1813 : :
1814 : : /* wrappers that also update important state inside usbcore */
1815 : : extern int usb_clear_halt(struct usb_device *dev, int pipe);
1816 : : extern int usb_reset_configuration(struct usb_device *dev);
1817 : : extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate);
1818 : : extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr);
1819 : :
1820 : : /* this request isn't really synchronous, but it belongs with the others */
1821 : : extern int usb_driver_set_configuration(struct usb_device *udev, int config);
1822 : :
1823 : : /* choose and set configuration for device */
1824 : : extern int usb_choose_configuration(struct usb_device *udev);
1825 : : extern int usb_set_configuration(struct usb_device *dev, int configuration);
1826 : :
1827 : : /*
1828 : : * timeouts, in milliseconds, used for sending/receiving control messages
1829 : : * they typically complete within a few frames (msec) after they're issued
1830 : : * USB identifies 5 second timeouts, maybe more in a few cases, and a few
1831 : : * slow devices (like some MGE Ellipse UPSes) actually push that limit.
1832 : : */
1833 : : #define USB_CTRL_GET_TIMEOUT 5000
1834 : : #define USB_CTRL_SET_TIMEOUT 5000
1835 : :
1836 : :
1837 : : /**
1838 : : * struct usb_sg_request - support for scatter/gather I/O
1839 : : * @status: zero indicates success, else negative errno
1840 : : * @bytes: counts bytes transferred.
1841 : : *
1842 : : * These requests are initialized using usb_sg_init(), and then are used
1843 : : * as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most
1844 : : * members of the request object aren't for driver access.
1845 : : *
1846 : : * The status and bytecount values are valid only after usb_sg_wait()
1847 : : * returns. If the status is zero, then the bytecount matches the total
1848 : : * from the request.
1849 : : *
1850 : : * After an error completion, drivers may need to clear a halt condition
1851 : : * on the endpoint.
1852 : : */
1853 : : struct usb_sg_request {
1854 : : int status;
1855 : : size_t bytes;
1856 : :
1857 : : /* private:
1858 : : * members below are private to usbcore,
1859 : : * and are not provided for driver access!
1860 : : */
1861 : : spinlock_t lock;
1862 : :
1863 : : struct usb_device *dev;
1864 : : int pipe;
1865 : :
1866 : : int entries;
1867 : : struct urb **urbs;
1868 : :
1869 : : int count;
1870 : : struct completion complete;
1871 : : };
1872 : :
1873 : : int usb_sg_init(
1874 : : struct usb_sg_request *io,
1875 : : struct usb_device *dev,
1876 : : unsigned pipe,
1877 : : unsigned period,
1878 : : struct scatterlist *sg,
1879 : : int nents,
1880 : : size_t length,
1881 : : gfp_t mem_flags
1882 : : );
1883 : : void usb_sg_cancel(struct usb_sg_request *io);
1884 : : void usb_sg_wait(struct usb_sg_request *io);
1885 : :
1886 : :
1887 : : /* ----------------------------------------------------------------------- */
1888 : :
1889 : : /*
1890 : : * For various legacy reasons, Linux has a small cookie that's paired with
1891 : : * a struct usb_device to identify an endpoint queue. Queue characteristics
1892 : : * are defined by the endpoint's descriptor. This cookie is called a "pipe",
1893 : : * an unsigned int encoded as:
1894 : : *
1895 : : * - direction: bit 7 (0 = Host-to-Device [Out],
1896 : : * 1 = Device-to-Host [In] ...
1897 : : * like endpoint bEndpointAddress)
1898 : : * - device address: bits 8-14 ... bit positions known to uhci-hcd
1899 : : * - endpoint: bits 15-18 ... bit positions known to uhci-hcd
1900 : : * - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt,
1901 : : * 10 = control, 11 = bulk)
1902 : : *
1903 : : * Given the device address and endpoint descriptor, pipes are redundant.
1904 : : */
1905 : :
1906 : : /* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */
1907 : : /* (yet ... they're the values used by usbfs) */
1908 : : #define PIPE_ISOCHRONOUS 0
1909 : : #define PIPE_INTERRUPT 1
1910 : : #define PIPE_CONTROL 2
1911 : : #define PIPE_BULK 3
1912 : :
1913 : : #define usb_pipein(pipe) ((pipe) & USB_DIR_IN)
1914 : : #define usb_pipeout(pipe) (!usb_pipein(pipe))
1915 : :
1916 : : #define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f)
1917 : : #define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf)
1918 : :
1919 : : #define usb_pipetype(pipe) (((pipe) >> 30) & 3)
1920 : : #define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
1921 : : #define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT)
1922 : : #define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL)
1923 : : #define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK)
1924 : :
1925 : 0 : static inline unsigned int __create_pipe(struct usb_device *dev,
1926 : : unsigned int endpoint)
1927 : : {
1928 [ # # # # : 0 : return (dev->devnum << 8) | (endpoint << 15);
# # # # ]
1929 : : }
1930 : :
1931 : : /* Create various pipes... */
1932 : : #define usb_sndctrlpipe(dev, endpoint) \
1933 : : ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint))
1934 : : #define usb_rcvctrlpipe(dev, endpoint) \
1935 : : ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
1936 : : #define usb_sndisocpipe(dev, endpoint) \
1937 : : ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint))
1938 : : #define usb_rcvisocpipe(dev, endpoint) \
1939 : : ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
1940 : : #define usb_sndbulkpipe(dev, endpoint) \
1941 : : ((PIPE_BULK << 30) | __create_pipe(dev, endpoint))
1942 : : #define usb_rcvbulkpipe(dev, endpoint) \
1943 : : ((PIPE_BULK << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
1944 : : #define usb_sndintpipe(dev, endpoint) \
1945 : : ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint))
1946 : : #define usb_rcvintpipe(dev, endpoint) \
1947 : : ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
1948 : :
1949 : : static inline struct usb_host_endpoint *
1950 : 0 : usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe)
1951 : : {
1952 : 0 : struct usb_host_endpoint **eps;
1953 [ # # # # : 0 : eps = usb_pipein(pipe) ? dev->ep_in : dev->ep_out;
# # ]
1954 [ # # # # : 0 : return eps[usb_pipeendpoint(pipe)];
# # ]
1955 : : }
1956 : :
1957 : : /*-------------------------------------------------------------------------*/
1958 : :
1959 : : static inline __u16
1960 : 0 : usb_maxpacket(struct usb_device *udev, int pipe, int is_out)
1961 : : {
1962 : 0 : struct usb_host_endpoint *ep;
1963 : 0 : unsigned epnum = usb_pipeendpoint(pipe);
1964 : :
1965 [ # # ]: 0 : if (is_out) {
1966 [ # # ]: 0 : WARN_ON(usb_pipein(pipe));
1967 : 0 : ep = udev->ep_out[epnum];
1968 : : } else {
1969 [ # # ]: 0 : WARN_ON(usb_pipeout(pipe));
1970 : 0 : ep = udev->ep_in[epnum];
1971 : : }
1972 [ # # ]: 0 : if (!ep)
1973 : : return 0;
1974 : :
1975 : : /* NOTE: only 0x07ff bits are for packet size... */
1976 : 0 : return usb_endpoint_maxp(&ep->desc);
1977 : : }
1978 : :
1979 : : /* ----------------------------------------------------------------------- */
1980 : :
1981 : : /* translate USB error codes to codes user space understands */
1982 : : static inline int usb_translate_errors(int error_code)
1983 : : {
1984 : : switch (error_code) {
1985 : : case 0:
1986 : : case -ENOMEM:
1987 : : case -ENODEV:
1988 : : case -EOPNOTSUPP:
1989 : : return error_code;
1990 : : default:
1991 : : return -EIO;
1992 : : }
1993 : : }
1994 : :
1995 : : /* Events from the usb core */
1996 : : #define USB_DEVICE_ADD 0x0001
1997 : : #define USB_DEVICE_REMOVE 0x0002
1998 : : #define USB_BUS_ADD 0x0003
1999 : : #define USB_BUS_REMOVE 0x0004
2000 : : extern void usb_register_notify(struct notifier_block *nb);
2001 : : extern void usb_unregister_notify(struct notifier_block *nb);
2002 : :
2003 : : /* debugfs stuff */
2004 : : extern struct dentry *usb_debug_root;
2005 : :
2006 : : /* LED triggers */
2007 : : enum usb_led_event {
2008 : : USB_LED_EVENT_HOST = 0,
2009 : : USB_LED_EVENT_GADGET = 1,
2010 : : };
2011 : :
2012 : : #ifdef CONFIG_USB_LED_TRIG
2013 : : extern void usb_led_activity(enum usb_led_event ev);
2014 : : #else
2015 : : static inline void usb_led_activity(enum usb_led_event ev) {}
2016 : : #endif
2017 : :
2018 : : #endif /* __KERNEL__ */
2019 : :
2020 : : #endif
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