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1 : : /* SPDX-License-Identifier: GPL-2.0-only */
2 : : /*
3 : : * Driver model for leds and led triggers
4 : : *
5 : : * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
6 : : * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
7 : : */
8 : : #ifndef __LINUX_LEDS_H_INCLUDED
9 : : #define __LINUX_LEDS_H_INCLUDED
10 : :
11 : : #include <dt-bindings/leds/common.h>
12 : : #include <linux/device.h>
13 : : #include <linux/kernfs.h>
14 : : #include <linux/list.h>
15 : : #include <linux/mutex.h>
16 : : #include <linux/rwsem.h>
17 : : #include <linux/spinlock.h>
18 : : #include <linux/timer.h>
19 : : #include <linux/workqueue.h>
20 : :
21 : : struct device;
22 : : struct led_pattern;
23 : : struct device_node;
24 : : /*
25 : : * LED Core
26 : : */
27 : :
28 : : enum led_brightness {
29 : : LED_OFF = 0,
30 : : LED_ON = 1,
31 : : LED_HALF = 127,
32 : : LED_FULL = 255,
33 : : };
34 : :
35 : : struct led_init_data {
36 : : /* device fwnode handle */
37 : : struct fwnode_handle *fwnode;
38 : : /*
39 : : * default <color:function> tuple, for backward compatibility
40 : : * with in-driver hard-coded LED names used as a fallback when
41 : : * DT "label" property is absent; it should be set to NULL
42 : : * in new LED class drivers.
43 : : */
44 : : const char *default_label;
45 : : /*
46 : : * string to be used for devicename section of LED class device
47 : : * either for label based LED name composition path or for fwnode
48 : : * based when devname_mandatory is true
49 : : */
50 : : const char *devicename;
51 : : /*
52 : : * indicates if LED name should always comprise devicename section;
53 : : * only LEDs exposed by drivers of hot-pluggable devices should
54 : : * set it to true
55 : : */
56 : : bool devname_mandatory;
57 : : };
58 : :
59 : : struct led_classdev {
60 : : const char *name;
61 : : enum led_brightness brightness;
62 : : enum led_brightness max_brightness;
63 : : int flags;
64 : :
65 : : /* Lower 16 bits reflect status */
66 : : #define LED_SUSPENDED BIT(0)
67 : : #define LED_UNREGISTERING BIT(1)
68 : : /* Upper 16 bits reflect control information */
69 : : #define LED_CORE_SUSPENDRESUME BIT(16)
70 : : #define LED_SYSFS_DISABLE BIT(17)
71 : : #define LED_DEV_CAP_FLASH BIT(18)
72 : : #define LED_HW_PLUGGABLE BIT(19)
73 : : #define LED_PANIC_INDICATOR BIT(20)
74 : : #define LED_BRIGHT_HW_CHANGED BIT(21)
75 : : #define LED_RETAIN_AT_SHUTDOWN BIT(22)
76 : : #define LED_INIT_DEFAULT_TRIGGER BIT(23)
77 : :
78 : : /* set_brightness_work / blink_timer flags, atomic, private. */
79 : : unsigned long work_flags;
80 : :
81 : : #define LED_BLINK_SW 0
82 : : #define LED_BLINK_ONESHOT 1
83 : : #define LED_BLINK_ONESHOT_STOP 2
84 : : #define LED_BLINK_INVERT 3
85 : : #define LED_BLINK_BRIGHTNESS_CHANGE 4
86 : : #define LED_BLINK_DISABLE 5
87 : :
88 : : /* Set LED brightness level
89 : : * Must not sleep. Use brightness_set_blocking for drivers
90 : : * that can sleep while setting brightness.
91 : : */
92 : : void (*brightness_set)(struct led_classdev *led_cdev,
93 : : enum led_brightness brightness);
94 : : /*
95 : : * Set LED brightness level immediately - it can block the caller for
96 : : * the time required for accessing a LED device register.
97 : : */
98 : : int (*brightness_set_blocking)(struct led_classdev *led_cdev,
99 : : enum led_brightness brightness);
100 : : /* Get LED brightness level */
101 : : enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
102 : :
103 : : /*
104 : : * Activate hardware accelerated blink, delays are in milliseconds
105 : : * and if both are zero then a sensible default should be chosen.
106 : : * The call should adjust the timings in that case and if it can't
107 : : * match the values specified exactly.
108 : : * Deactivate blinking again when the brightness is set to LED_OFF
109 : : * via the brightness_set() callback.
110 : : */
111 : : int (*blink_set)(struct led_classdev *led_cdev,
112 : : unsigned long *delay_on,
113 : : unsigned long *delay_off);
114 : :
115 : : int (*pattern_set)(struct led_classdev *led_cdev,
116 : : struct led_pattern *pattern, u32 len, int repeat);
117 : : int (*pattern_clear)(struct led_classdev *led_cdev);
118 : :
119 : : struct device *dev;
120 : : const struct attribute_group **groups;
121 : :
122 : : struct list_head node; /* LED Device list */
123 : : const char *default_trigger; /* Trigger to use */
124 : :
125 : : unsigned long blink_delay_on, blink_delay_off;
126 : : struct timer_list blink_timer;
127 : : int blink_brightness;
128 : : int new_blink_brightness;
129 : : void (*flash_resume)(struct led_classdev *led_cdev);
130 : :
131 : : struct work_struct set_brightness_work;
132 : : int delayed_set_value;
133 : :
134 : : #ifdef CONFIG_LEDS_TRIGGERS
135 : : /* Protects the trigger data below */
136 : : struct rw_semaphore trigger_lock;
137 : :
138 : : struct led_trigger *trigger;
139 : : struct list_head trig_list;
140 : : void *trigger_data;
141 : : /* true if activated - deactivate routine uses it to do cleanup */
142 : : bool activated;
143 : : #endif
144 : :
145 : : #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
146 : : int brightness_hw_changed;
147 : : struct kernfs_node *brightness_hw_changed_kn;
148 : : #endif
149 : :
150 : : /* Ensures consistent access to the LED Flash Class device */
151 : : struct mutex led_access;
152 : : };
153 : :
154 : : /**
155 : : * led_classdev_register_ext - register a new object of LED class with
156 : : * init data
157 : : * @parent: LED controller device this LED is driven by
158 : : * @led_cdev: the led_classdev structure for this device
159 : : * @init_data: the LED class device initialization data
160 : : *
161 : : * Register a new object of LED class, with name derived from init_data.
162 : : *
163 : : * Returns: 0 on success or negative error value on failure
164 : : */
165 : : int led_classdev_register_ext(struct device *parent,
166 : : struct led_classdev *led_cdev,
167 : : struct led_init_data *init_data);
168 : :
169 : : /**
170 : : * led_classdev_register - register a new object of LED class
171 : : * @parent: LED controller device this LED is driven by
172 : : * @led_cdev: the led_classdev structure for this device
173 : : *
174 : : * Register a new object of LED class, with name derived from the name property
175 : : * of passed led_cdev argument.
176 : : *
177 : : * Returns: 0 on success or negative error value on failure
178 : : */
179 : 84 : static inline int led_classdev_register(struct device *parent,
180 : : struct led_classdev *led_cdev)
181 : : {
182 : 84 : return led_classdev_register_ext(parent, led_cdev, NULL);
183 : : }
184 : :
185 : : int devm_led_classdev_register_ext(struct device *parent,
186 : : struct led_classdev *led_cdev,
187 : : struct led_init_data *init_data);
188 : :
189 : 0 : static inline int devm_led_classdev_register(struct device *parent,
190 : : struct led_classdev *led_cdev)
191 : : {
192 : 0 : return devm_led_classdev_register_ext(parent, led_cdev, NULL);
193 : : }
194 : : void led_classdev_unregister(struct led_classdev *led_cdev);
195 : : void devm_led_classdev_unregister(struct device *parent,
196 : : struct led_classdev *led_cdev);
197 : : void led_classdev_suspend(struct led_classdev *led_cdev);
198 : : void led_classdev_resume(struct led_classdev *led_cdev);
199 : :
200 : : extern struct led_classdev *of_led_get(struct device_node *np, int index);
201 : : extern void led_put(struct led_classdev *led_cdev);
202 : : struct led_classdev *__must_check devm_of_led_get(struct device *dev,
203 : : int index);
204 : :
205 : : /**
206 : : * led_blink_set - set blinking with software fallback
207 : : * @led_cdev: the LED to start blinking
208 : : * @delay_on: the time it should be on (in ms)
209 : : * @delay_off: the time it should ble off (in ms)
210 : : *
211 : : * This function makes the LED blink, attempting to use the
212 : : * hardware acceleration if possible, but falling back to
213 : : * software blinking if there is no hardware blinking or if
214 : : * the LED refuses the passed values.
215 : : *
216 : : * Note that if software blinking is active, simply calling
217 : : * led_cdev->brightness_set() will not stop the blinking,
218 : : * use led_classdev_brightness_set() instead.
219 : : */
220 : : void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
221 : : unsigned long *delay_off);
222 : : /**
223 : : * led_blink_set_oneshot - do a oneshot software blink
224 : : * @led_cdev: the LED to start blinking
225 : : * @delay_on: the time it should be on (in ms)
226 : : * @delay_off: the time it should ble off (in ms)
227 : : * @invert: blink off, then on, leaving the led on
228 : : *
229 : : * This function makes the LED blink one time for delay_on +
230 : : * delay_off time, ignoring the request if another one-shot
231 : : * blink is already in progress.
232 : : *
233 : : * If invert is set, led blinks for delay_off first, then for
234 : : * delay_on and leave the led on after the on-off cycle.
235 : : */
236 : : void led_blink_set_oneshot(struct led_classdev *led_cdev,
237 : : unsigned long *delay_on, unsigned long *delay_off,
238 : : int invert);
239 : : /**
240 : : * led_set_brightness - set LED brightness
241 : : * @led_cdev: the LED to set
242 : : * @brightness: the brightness to set it to
243 : : *
244 : : * Set an LED's brightness, and, if necessary, cancel the
245 : : * software blink timer that implements blinking when the
246 : : * hardware doesn't. This function is guaranteed not to sleep.
247 : : */
248 : : void led_set_brightness(struct led_classdev *led_cdev,
249 : : enum led_brightness brightness);
250 : :
251 : : /**
252 : : * led_set_brightness_sync - set LED brightness synchronously
253 : : * @led_cdev: the LED to set
254 : : * @value: the brightness to set it to
255 : : *
256 : : * Set an LED's brightness immediately. This function will block
257 : : * the caller for the time required for accessing device registers,
258 : : * and it can sleep.
259 : : *
260 : : * Returns: 0 on success or negative error value on failure
261 : : */
262 : : int led_set_brightness_sync(struct led_classdev *led_cdev,
263 : : enum led_brightness value);
264 : :
265 : : /**
266 : : * led_update_brightness - update LED brightness
267 : : * @led_cdev: the LED to query
268 : : *
269 : : * Get an LED's current brightness and update led_cdev->brightness
270 : : * member with the obtained value.
271 : : *
272 : : * Returns: 0 on success or negative error value on failure
273 : : */
274 : : int led_update_brightness(struct led_classdev *led_cdev);
275 : :
276 : : /**
277 : : * led_get_default_pattern - return default pattern
278 : : *
279 : : * @led_cdev: the LED to get default pattern for
280 : : * @size: pointer for storing the number of elements in returned array,
281 : : * modified only if return != NULL
282 : : *
283 : : * Return: Allocated array of integers with default pattern from device tree
284 : : * or NULL. Caller is responsible for kfree().
285 : : */
286 : : u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size);
287 : :
288 : : /**
289 : : * led_sysfs_disable - disable LED sysfs interface
290 : : * @led_cdev: the LED to set
291 : : *
292 : : * Disable the led_cdev's sysfs interface.
293 : : */
294 : : void led_sysfs_disable(struct led_classdev *led_cdev);
295 : :
296 : : /**
297 : : * led_sysfs_enable - enable LED sysfs interface
298 : : * @led_cdev: the LED to set
299 : : *
300 : : * Enable the led_cdev's sysfs interface.
301 : : */
302 : : void led_sysfs_enable(struct led_classdev *led_cdev);
303 : :
304 : : /**
305 : : * led_compose_name - compose LED class device name
306 : : * @dev: LED controller device object
307 : : * @init_data: the LED class device initialization data
308 : : * @led_classdev_name: composed LED class device name
309 : : *
310 : : * Create LED class device name basing on the provided init_data argument.
311 : : * The name can have <devicename:color:function> or <color:function>.
312 : : * form, depending on the init_data configuration.
313 : : *
314 : : * Returns: 0 on success or negative error value on failure
315 : : */
316 : : int led_compose_name(struct device *dev, struct led_init_data *init_data,
317 : : char *led_classdev_name);
318 : :
319 : : /**
320 : : * led_sysfs_is_disabled - check if LED sysfs interface is disabled
321 : : * @led_cdev: the LED to query
322 : : *
323 : : * Returns: true if the led_cdev's sysfs interface is disabled.
324 : : */
325 : 0 : static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
326 : : {
327 [ # # ]: 0 : return led_cdev->flags & LED_SYSFS_DISABLE;
328 : : }
329 : :
330 : : /*
331 : : * LED Triggers
332 : : */
333 : : /* Registration functions for simple triggers */
334 : : #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
335 : : #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
336 : :
337 : : #ifdef CONFIG_LEDS_TRIGGERS
338 : :
339 : : #define TRIG_NAME_MAX 50
340 : :
341 : : struct led_trigger {
342 : : /* Trigger Properties */
343 : : const char *name;
344 : : int (*activate)(struct led_classdev *led_cdev);
345 : : void (*deactivate)(struct led_classdev *led_cdev);
346 : :
347 : : /* LEDs under control by this trigger (for simple triggers) */
348 : : rwlock_t leddev_list_lock;
349 : : struct list_head led_cdevs;
350 : :
351 : : /* Link to next registered trigger */
352 : : struct list_head next_trig;
353 : :
354 : : const struct attribute_group **groups;
355 : : };
356 : :
357 : : /*
358 : : * Currently the attributes in struct led_trigger::groups are added directly to
359 : : * the LED device. As this might change in the future, the following
360 : : * macros abstract getting the LED device and its trigger_data from the dev
361 : : * parameter passed to the attribute accessor functions.
362 : : */
363 : : #define led_trigger_get_led(dev) ((struct led_classdev *)dev_get_drvdata((dev)))
364 : : #define led_trigger_get_drvdata(dev) (led_get_trigger_data(led_trigger_get_led(dev)))
365 : :
366 : : /* Registration functions for complex triggers */
367 : : int led_trigger_register(struct led_trigger *trigger);
368 : : void led_trigger_unregister(struct led_trigger *trigger);
369 : : int devm_led_trigger_register(struct device *dev,
370 : : struct led_trigger *trigger);
371 : :
372 : : void led_trigger_register_simple(const char *name,
373 : : struct led_trigger **trigger);
374 : : void led_trigger_unregister_simple(struct led_trigger *trigger);
375 : : void led_trigger_event(struct led_trigger *trigger, enum led_brightness event);
376 : : void led_trigger_blink(struct led_trigger *trigger, unsigned long *delay_on,
377 : : unsigned long *delay_off);
378 : : void led_trigger_blink_oneshot(struct led_trigger *trigger,
379 : : unsigned long *delay_on,
380 : : unsigned long *delay_off,
381 : : int invert);
382 : : void led_trigger_set_default(struct led_classdev *led_cdev);
383 : : int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger);
384 : : void led_trigger_remove(struct led_classdev *led_cdev);
385 : :
386 : : static inline void led_set_trigger_data(struct led_classdev *led_cdev,
387 : : void *trigger_data)
388 : : {
389 : : led_cdev->trigger_data = trigger_data;
390 : : }
391 : :
392 : : static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
393 : : {
394 : : return led_cdev->trigger_data;
395 : : }
396 : :
397 : : /**
398 : : * led_trigger_rename_static - rename a trigger
399 : : * @name: the new trigger name
400 : : * @trig: the LED trigger to rename
401 : : *
402 : : * Change a LED trigger name by copying the string passed in
403 : : * name into current trigger name, which MUST be large
404 : : * enough for the new string.
405 : : *
406 : : * Note that name must NOT point to the same string used
407 : : * during LED registration, as that could lead to races.
408 : : *
409 : : * This is meant to be used on triggers with statically
410 : : * allocated name.
411 : : */
412 : : void led_trigger_rename_static(const char *name, struct led_trigger *trig);
413 : :
414 : : #define module_led_trigger(__led_trigger) \
415 : : module_driver(__led_trigger, led_trigger_register, \
416 : : led_trigger_unregister)
417 : :
418 : : #else
419 : :
420 : : /* Trigger has no members */
421 : : struct led_trigger {};
422 : :
423 : : /* Trigger inline empty functions */
424 : : static inline void led_trigger_register_simple(const char *name,
425 : : struct led_trigger **trigger) {}
426 : : static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
427 : : static inline void led_trigger_event(struct led_trigger *trigger,
428 : : enum led_brightness event) {}
429 : : static inline void led_trigger_blink(struct led_trigger *trigger,
430 : : unsigned long *delay_on,
431 : : unsigned long *delay_off) {}
432 : : static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
433 : : unsigned long *delay_on,
434 : : unsigned long *delay_off,
435 : : int invert) {}
436 : : static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
437 : : static inline int led_trigger_set(struct led_classdev *led_cdev,
438 : : struct led_trigger *trigger)
439 : : {
440 : : return 0;
441 : : }
442 : :
443 : : static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
444 : : static inline void led_set_trigger_data(struct led_classdev *led_cdev) {}
445 : : static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
446 : : {
447 : : return NULL;
448 : : }
449 : :
450 : : #endif /* CONFIG_LEDS_TRIGGERS */
451 : :
452 : : /* Trigger specific functions */
453 : : #ifdef CONFIG_LEDS_TRIGGER_DISK
454 : : void ledtrig_disk_activity(bool write);
455 : : #else
456 [ + - ]: 29820 : static inline void ledtrig_disk_activity(bool write) {}
457 : : #endif
458 : :
459 : : #ifdef CONFIG_LEDS_TRIGGER_MTD
460 : : void ledtrig_mtd_activity(void);
461 : : #else
462 : : static inline void ledtrig_mtd_activity(void) {}
463 : : #endif
464 : :
465 : : #if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
466 : : void ledtrig_flash_ctrl(bool on);
467 : : void ledtrig_torch_ctrl(bool on);
468 : : #else
469 : : static inline void ledtrig_flash_ctrl(bool on) {}
470 : : static inline void ledtrig_torch_ctrl(bool on) {}
471 : : #endif
472 : :
473 : : /*
474 : : * Generic LED platform data for describing LED names and default triggers.
475 : : */
476 : : struct led_info {
477 : : const char *name;
478 : : const char *default_trigger;
479 : : int flags;
480 : : };
481 : :
482 : : struct led_platform_data {
483 : : int num_leds;
484 : : struct led_info *leds;
485 : : };
486 : :
487 : : struct led_properties {
488 : : u32 color;
489 : : bool color_present;
490 : : const char *function;
491 : : u32 func_enum;
492 : : bool func_enum_present;
493 : : const char *label;
494 : : };
495 : :
496 : : struct gpio_desc;
497 : : typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
498 : : unsigned long *delay_on,
499 : : unsigned long *delay_off);
500 : :
501 : : /* For the leds-gpio driver */
502 : : struct gpio_led {
503 : : const char *name;
504 : : const char *default_trigger;
505 : : unsigned gpio;
506 : : unsigned active_low : 1;
507 : : unsigned retain_state_suspended : 1;
508 : : unsigned panic_indicator : 1;
509 : : unsigned default_state : 2;
510 : : unsigned retain_state_shutdown : 1;
511 : : /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
512 : : struct gpio_desc *gpiod;
513 : : };
514 : : #define LEDS_GPIO_DEFSTATE_OFF 0
515 : : #define LEDS_GPIO_DEFSTATE_ON 1
516 : : #define LEDS_GPIO_DEFSTATE_KEEP 2
517 : :
518 : : struct gpio_led_platform_data {
519 : : int num_leds;
520 : : const struct gpio_led *leds;
521 : :
522 : : #define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
523 : : #define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
524 : : #define GPIO_LED_BLINK 2 /* Please, blink */
525 : : gpio_blink_set_t gpio_blink_set;
526 : : };
527 : :
528 : : #ifdef CONFIG_NEW_LEDS
529 : : struct platform_device *gpio_led_register_device(
530 : : int id, const struct gpio_led_platform_data *pdata);
531 : : #else
532 : : static inline struct platform_device *gpio_led_register_device(
533 : : int id, const struct gpio_led_platform_data *pdata)
534 : : {
535 : : return 0;
536 : : }
537 : : #endif
538 : :
539 : : enum cpu_led_event {
540 : : CPU_LED_IDLE_START, /* CPU enters idle */
541 : : CPU_LED_IDLE_END, /* CPU idle ends */
542 : : CPU_LED_START, /* Machine starts, especially resume */
543 : : CPU_LED_STOP, /* Machine stops, especially suspend */
544 : : CPU_LED_HALTED, /* Machine shutdown */
545 : : };
546 : : #ifdef CONFIG_LEDS_TRIGGER_CPU
547 : : void ledtrig_cpu(enum cpu_led_event evt);
548 : : #else
549 : : static inline void ledtrig_cpu(enum cpu_led_event evt)
550 : : {
551 : : return;
552 : : }
553 : : #endif
554 : :
555 : : #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
556 : : void led_classdev_notify_brightness_hw_changed(
557 : : struct led_classdev *led_cdev, enum led_brightness brightness);
558 : : #else
559 : : static inline void led_classdev_notify_brightness_hw_changed(
560 : : struct led_classdev *led_cdev, enum led_brightness brightness) { }
561 : : #endif
562 : :
563 : : /**
564 : : * struct led_pattern - pattern interval settings
565 : : * @delta_t: pattern interval delay, in milliseconds
566 : : * @brightness: pattern interval brightness
567 : : */
568 : : struct led_pattern {
569 : : u32 delta_t;
570 : : int brightness;
571 : : };
572 : :
573 : : enum led_audio {
574 : : LED_AUDIO_MUTE, /* master mute LED */
575 : : LED_AUDIO_MICMUTE, /* mic mute LED */
576 : : NUM_AUDIO_LEDS
577 : : };
578 : :
579 : : #if IS_ENABLED(CONFIG_LEDS_TRIGGER_AUDIO)
580 : : enum led_brightness ledtrig_audio_get(enum led_audio type);
581 : : void ledtrig_audio_set(enum led_audio type, enum led_brightness state);
582 : : #else
583 : : static inline enum led_brightness ledtrig_audio_get(enum led_audio type)
584 : : {
585 : : return LED_OFF;
586 : : }
587 : : static inline void ledtrig_audio_set(enum led_audio type,
588 : : enum led_brightness state)
589 : : {
590 : : }
591 : : #endif
592 : :
593 : : #endif /* __LINUX_LEDS_H_INCLUDED */
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