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/mutex.h>
14#include <linux/rwsem.h>
15#include <linux/spinlock.h>
16#include <linux/timer.h>
17#include <linux/types.h>
18#include <linux/workqueue.h>
19
20struct attribute_group;
21struct device_node;
22struct fwnode_handle;
23struct gpio_desc;
24struct kernfs_node;
25struct led_pattern;
26struct platform_device;
27
28/*
29 * LED Core
30 */
31
32/* This is obsolete/useless. We now support variable maximum brightness. */
33enum led_brightness {
34 LED_OFF = 0,
35 LED_ON = 1,
36 LED_HALF = 127,
37 LED_FULL = 255,
38};
39
40enum led_default_state {
41 LEDS_DEFSTATE_OFF = 0,
42 LEDS_DEFSTATE_ON = 1,
43 LEDS_DEFSTATE_KEEP = 2,
44};
45
46/**
47 * struct led_lookup_data - represents a single LED lookup entry
48 *
49 * @list: internal list of all LED lookup entries
50 * @provider: name of led_classdev providing the LED
51 * @dev_id: name of the device associated with this LED
52 * @con_id: name of the LED from the device's point of view
53 */
54struct led_lookup_data {
55 struct list_head list;
56 const char *provider;
57 const char *dev_id;
58 const char *con_id;
59};
60
61struct led_init_data {
62 /* device fwnode handle */
63 struct fwnode_handle *fwnode;
64 /*
65 * default <color:function> tuple, for backward compatibility
66 * with in-driver hard-coded LED names used as a fallback when
67 * DT "label" property is absent; it should be set to NULL
68 * in new LED class drivers.
69 */
70 const char *default_label;
71 /*
72 * string to be used for devicename section of LED class device
73 * either for label based LED name composition path or for fwnode
74 * based when devname_mandatory is true
75 */
76 const char *devicename;
77 /*
78 * indicates if LED name should always comprise devicename section;
79 * only LEDs exposed by drivers of hot-pluggable devices should
80 * set it to true
81 */
82 bool devname_mandatory;
83};
84
85enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode);
86
87struct led_hw_trigger_type {
88 int dummy;
89};
90
91struct led_classdev {
92 const char *name;
93 unsigned int brightness;
94 unsigned int max_brightness;
95 unsigned int color;
96 int flags;
97
98 /* Lower 16 bits reflect status */
99#define LED_SUSPENDED BIT(0)
100#define LED_UNREGISTERING BIT(1)
101 /* Upper 16 bits reflect control information */
102#define LED_CORE_SUSPENDRESUME BIT(16)
103#define LED_SYSFS_DISABLE BIT(17)
104#define LED_DEV_CAP_FLASH BIT(18)
105#define LED_HW_PLUGGABLE BIT(19)
106#define LED_PANIC_INDICATOR BIT(20)
107#define LED_BRIGHT_HW_CHANGED BIT(21)
108#define LED_RETAIN_AT_SHUTDOWN BIT(22)
109#define LED_INIT_DEFAULT_TRIGGER BIT(23)
110
111 /* set_brightness_work / blink_timer flags, atomic, private. */
112 unsigned long work_flags;
113
114#define LED_BLINK_SW 0
115#define LED_BLINK_ONESHOT 1
116#define LED_BLINK_ONESHOT_STOP 2
117#define LED_BLINK_INVERT 3
118#define LED_BLINK_BRIGHTNESS_CHANGE 4
119#define LED_BLINK_DISABLE 5
120 /* Brightness off also disables hw-blinking so it is a separate action */
121#define LED_SET_BRIGHTNESS_OFF 6
122#define LED_SET_BRIGHTNESS 7
123#define LED_SET_BLINK 8
124
125 /* Set LED brightness level
126 * Must not sleep. Use brightness_set_blocking for drivers
127 * that can sleep while setting brightness.
128 */
129 void (*brightness_set)(struct led_classdev *led_cdev,
130 enum led_brightness brightness);
131 /*
132 * Set LED brightness level immediately - it can block the caller for
133 * the time required for accessing a LED device register.
134 */
135 int (*brightness_set_blocking)(struct led_classdev *led_cdev,
136 enum led_brightness brightness);
137 /* Get LED brightness level */
138 enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
139
140 /*
141 * Activate hardware accelerated blink, delays are in milliseconds
142 * and if both are zero then a sensible default should be chosen.
143 * The call should adjust the timings in that case and if it can't
144 * match the values specified exactly.
145 * Deactivate blinking again when the brightness is set to LED_OFF
146 * via the brightness_set() callback.
147 * For led_blink_set_nosleep() the LED core assumes that blink_set
148 * implementations, of drivers which do not use brightness_set_blocking,
149 * will not sleep. Therefor if brightness_set_blocking is not set
150 * this function must not sleep!
151 */
152 int (*blink_set)(struct led_classdev *led_cdev,
153 unsigned long *delay_on,
154 unsigned long *delay_off);
155
156 int (*pattern_set)(struct led_classdev *led_cdev,
157 struct led_pattern *pattern, u32 len, int repeat);
158 int (*pattern_clear)(struct led_classdev *led_cdev);
159
160 struct device *dev;
161 const struct attribute_group **groups;
162
163 struct list_head node; /* LED Device list */
164 const char *default_trigger; /* Trigger to use */
165
166 unsigned long blink_delay_on, blink_delay_off;
167 struct timer_list blink_timer;
168 int blink_brightness;
169 int new_blink_brightness;
170 void (*flash_resume)(struct led_classdev *led_cdev);
171
172 struct work_struct set_brightness_work;
173 int delayed_set_value;
174 unsigned long delayed_delay_on;
175 unsigned long delayed_delay_off;
176
177#ifdef CONFIG_LEDS_TRIGGERS
178 /* Protects the trigger data below */
179 struct rw_semaphore trigger_lock;
180
181 struct led_trigger *trigger;
182 struct list_head trig_list;
183 void *trigger_data;
184 /* true if activated - deactivate routine uses it to do cleanup */
185 bool activated;
186
187 /* LEDs that have private triggers have this set */
188 struct led_hw_trigger_type *trigger_type;
189
190 /* Unique trigger name supported by LED set in hw control mode */
191 const char *hw_control_trigger;
192 /*
193 * Check if the LED driver supports the requested mode provided by the
194 * defined supported trigger to setup the LED to hw control mode.
195 *
196 * Return 0 on success. Return -EOPNOTSUPP when the passed flags are not
197 * supported and software fallback needs to be used.
198 * Return a negative error number on any other case for check fail due
199 * to various reason like device not ready or timeouts.
200 */
201 int (*hw_control_is_supported)(struct led_classdev *led_cdev,
202 unsigned long flags);
203 /*
204 * Activate hardware control, LED driver will use the provided flags
205 * from the supported trigger and setup the LED to be driven by hardware
206 * following the requested mode from the trigger flags.
207 * Deactivate hardware blink control by setting brightness to LED_OFF via
208 * the brightness_set() callback.
209 *
210 * Return 0 on success, a negative error number on flags apply fail.
211 */
212 int (*hw_control_set)(struct led_classdev *led_cdev,
213 unsigned long flags);
214 /*
215 * Get from the LED driver the current mode that the LED is set in hw
216 * control mode and put them in flags.
217 * Trigger can use this to get the initial state of a LED already set in
218 * hardware blink control.
219 *
220 * Return 0 on success, a negative error number on failing parsing the
221 * initial mode. Error from this function is NOT FATAL as the device
222 * may be in a not supported initial state by the attached LED trigger.
223 */
224 int (*hw_control_get)(struct led_classdev *led_cdev,
225 unsigned long *flags);
226 /*
227 * Get the device this LED blinks in response to.
228 * e.g. for a PHY LED, it is the network device. If the LED is
229 * not yet associated to a device, return NULL.
230 */
231 struct device *(*hw_control_get_device)(struct led_classdev *led_cdev);
232#endif
233
234#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
235 int brightness_hw_changed;
236 struct kernfs_node *brightness_hw_changed_kn;
237#endif
238
239 /* Ensures consistent access to the LED Flash Class device */
240 struct mutex led_access;
241};
242
243/**
244 * led_classdev_register_ext - register a new object of LED class with
245 * init data
246 * @parent: LED controller device this LED is driven by
247 * @led_cdev: the led_classdev structure for this device
248 * @init_data: the LED class device initialization data
249 *
250 * Register a new object of LED class, with name derived from init_data.
251 *
252 * Returns: 0 on success or negative error value on failure
253 */
254int led_classdev_register_ext(struct device *parent,
255 struct led_classdev *led_cdev,
256 struct led_init_data *init_data);
257
258/**
259 * led_classdev_register - register a new object of LED class
260 * @parent: LED controller device this LED is driven by
261 * @led_cdev: the led_classdev structure for this device
262 *
263 * Register a new object of LED class, with name derived from the name property
264 * of passed led_cdev argument.
265 *
266 * Returns: 0 on success or negative error value on failure
267 */
268static inline int led_classdev_register(struct device *parent,
269 struct led_classdev *led_cdev)
270{
271 return led_classdev_register_ext(parent, led_cdev, NULL);
272}
273
274int devm_led_classdev_register_ext(struct device *parent,
275 struct led_classdev *led_cdev,
276 struct led_init_data *init_data);
277static inline int devm_led_classdev_register(struct device *parent,
278 struct led_classdev *led_cdev)
279{
280 return devm_led_classdev_register_ext(parent, led_cdev, NULL);
281}
282void led_classdev_unregister(struct led_classdev *led_cdev);
283void devm_led_classdev_unregister(struct device *parent,
284 struct led_classdev *led_cdev);
285void led_classdev_suspend(struct led_classdev *led_cdev);
286void led_classdev_resume(struct led_classdev *led_cdev);
287
288void led_add_lookup(struct led_lookup_data *led_lookup);
289void led_remove_lookup(struct led_lookup_data *led_lookup);
290
291struct led_classdev *__must_check led_get(struct device *dev, char *con_id);
292struct led_classdev *__must_check devm_led_get(struct device *dev, char *con_id);
293
294extern struct led_classdev *of_led_get(struct device_node *np, int index);
295extern void led_put(struct led_classdev *led_cdev);
296struct led_classdev *__must_check devm_of_led_get(struct device *dev,
297 int index);
298struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev,
299 int index);
300
301/**
302 * led_blink_set - set blinking with software fallback
303 * @led_cdev: the LED to start blinking
304 * @delay_on: the time it should be on (in ms)
305 * @delay_off: the time it should ble off (in ms)
306 *
307 * This function makes the LED blink, attempting to use the
308 * hardware acceleration if possible, but falling back to
309 * software blinking if there is no hardware blinking or if
310 * the LED refuses the passed values.
311 *
312 * This function may sleep!
313 *
314 * Note that if software blinking is active, simply calling
315 * led_cdev->brightness_set() will not stop the blinking,
316 * use led_set_brightness() instead.
317 */
318void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
319 unsigned long *delay_off);
320
321/**
322 * led_blink_set_nosleep - set blinking, guaranteed to not sleep
323 * @led_cdev: the LED to start blinking
324 * @delay_on: the time it should be on (in ms)
325 * @delay_off: the time it should ble off (in ms)
326 *
327 * This function makes the LED blink and is guaranteed to not sleep. Otherwise
328 * this is the same as led_blink_set(), see led_blink_set() for details.
329 */
330void led_blink_set_nosleep(struct led_classdev *led_cdev, unsigned long delay_on,
331 unsigned long delay_off);
332
333/**
334 * led_blink_set_oneshot - do a oneshot software blink
335 * @led_cdev: the LED to start blinking
336 * @delay_on: the time it should be on (in ms)
337 * @delay_off: the time it should ble off (in ms)
338 * @invert: blink off, then on, leaving the led on
339 *
340 * This function makes the LED blink one time for delay_on +
341 * delay_off time, ignoring the request if another one-shot
342 * blink is already in progress.
343 *
344 * If invert is set, led blinks for delay_off first, then for
345 * delay_on and leave the led on after the on-off cycle.
346 *
347 * This function is guaranteed not to sleep.
348 */
349void led_blink_set_oneshot(struct led_classdev *led_cdev,
350 unsigned long *delay_on, unsigned long *delay_off,
351 int invert);
352/**
353 * led_set_brightness - set LED brightness
354 * @led_cdev: the LED to set
355 * @brightness: the brightness to set it to
356 *
357 * Set an LED's brightness, and, if necessary, cancel the
358 * software blink timer that implements blinking when the
359 * hardware doesn't. This function is guaranteed not to sleep.
360 */
361void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness);
362
363/**
364 * led_set_brightness_sync - set LED brightness synchronously
365 * @led_cdev: the LED to set
366 * @value: the brightness to set it to
367 *
368 * Set an LED's brightness immediately. This function will block
369 * the caller for the time required for accessing device registers,
370 * and it can sleep.
371 *
372 * Returns: 0 on success or negative error value on failure
373 */
374int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value);
375
376/**
377 * led_update_brightness - update LED brightness
378 * @led_cdev: the LED to query
379 *
380 * Get an LED's current brightness and update led_cdev->brightness
381 * member with the obtained value.
382 *
383 * Returns: 0 on success or negative error value on failure
384 */
385int led_update_brightness(struct led_classdev *led_cdev);
386
387/**
388 * led_get_default_pattern - return default pattern
389 *
390 * @led_cdev: the LED to get default pattern for
391 * @size: pointer for storing the number of elements in returned array,
392 * modified only if return != NULL
393 *
394 * Return: Allocated array of integers with default pattern from device tree
395 * or NULL. Caller is responsible for kfree().
396 */
397u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size);
398
399/**
400 * led_sysfs_disable - disable LED sysfs interface
401 * @led_cdev: the LED to set
402 *
403 * Disable the led_cdev's sysfs interface.
404 */
405void led_sysfs_disable(struct led_classdev *led_cdev);
406
407/**
408 * led_sysfs_enable - enable LED sysfs interface
409 * @led_cdev: the LED to set
410 *
411 * Enable the led_cdev's sysfs interface.
412 */
413void led_sysfs_enable(struct led_classdev *led_cdev);
414
415/**
416 * led_compose_name - compose LED class device name
417 * @dev: LED controller device object
418 * @init_data: the LED class device initialization data
419 * @led_classdev_name: composed LED class device name
420 *
421 * Create LED class device name basing on the provided init_data argument.
422 * The name can have <devicename:color:function> or <color:function>.
423 * form, depending on the init_data configuration.
424 *
425 * Returns: 0 on success or negative error value on failure
426 */
427int led_compose_name(struct device *dev, struct led_init_data *init_data,
428 char *led_classdev_name);
429
430/**
431 * led_sysfs_is_disabled - check if LED sysfs interface is disabled
432 * @led_cdev: the LED to query
433 *
434 * Returns: true if the led_cdev's sysfs interface is disabled.
435 */
436static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
437{
438 return led_cdev->flags & LED_SYSFS_DISABLE;
439}
440
441/*
442 * LED Triggers
443 */
444/* Registration functions for simple triggers */
445#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
446#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
447
448#ifdef CONFIG_LEDS_TRIGGERS
449
450#define TRIG_NAME_MAX 50
451
452struct led_trigger {
453 /* Trigger Properties */
454 const char *name;
455 int (*activate)(struct led_classdev *led_cdev);
456 void (*deactivate)(struct led_classdev *led_cdev);
457
458 /* LED-private triggers have this set */
459 struct led_hw_trigger_type *trigger_type;
460
461 /* LEDs under control by this trigger (for simple triggers) */
462 spinlock_t leddev_list_lock;
463 struct list_head led_cdevs;
464
465 /* Link to next registered trigger */
466 struct list_head next_trig;
467
468 const struct attribute_group **groups;
469};
470
471/*
472 * Currently the attributes in struct led_trigger::groups are added directly to
473 * the LED device. As this might change in the future, the following
474 * macros abstract getting the LED device and its trigger_data from the dev
475 * parameter passed to the attribute accessor functions.
476 */
477#define led_trigger_get_led(dev) ((struct led_classdev *)dev_get_drvdata((dev)))
478#define led_trigger_get_drvdata(dev) (led_get_trigger_data(led_trigger_get_led(dev)))
479
480/* Registration functions for complex triggers */
481int led_trigger_register(struct led_trigger *trigger);
482void led_trigger_unregister(struct led_trigger *trigger);
483int devm_led_trigger_register(struct device *dev,
484 struct led_trigger *trigger);
485
486void led_trigger_register_simple(const char *name,
487 struct led_trigger **trigger);
488void led_trigger_unregister_simple(struct led_trigger *trigger);
489void led_trigger_event(struct led_trigger *trigger, enum led_brightness event);
490void led_trigger_blink(struct led_trigger *trigger, unsigned long delay_on,
491 unsigned long delay_off);
492void led_trigger_blink_oneshot(struct led_trigger *trigger,
493 unsigned long delay_on,
494 unsigned long delay_off,
495 int invert);
496void led_trigger_set_default(struct led_classdev *led_cdev);
497int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger);
498void led_trigger_remove(struct led_classdev *led_cdev);
499
500static inline void led_set_trigger_data(struct led_classdev *led_cdev,
501 void *trigger_data)
502{
503 led_cdev->trigger_data = trigger_data;
504}
505
506static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
507{
508 return led_cdev->trigger_data;
509}
510
511#define module_led_trigger(__led_trigger) \
512 module_driver(__led_trigger, led_trigger_register, \
513 led_trigger_unregister)
514
515#else
516
517/* Trigger has no members */
518struct led_trigger {};
519
520/* Trigger inline empty functions */
521static inline void led_trigger_register_simple(const char *name,
522 struct led_trigger **trigger) {}
523static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
524static inline void led_trigger_event(struct led_trigger *trigger,
525 enum led_brightness event) {}
526static inline void led_trigger_blink(struct led_trigger *trigger,
527 unsigned long delay_on,
528 unsigned long delay_off) {}
529static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
530 unsigned long delay_on,
531 unsigned long delay_off,
532 int invert) {}
533static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
534static inline int led_trigger_set(struct led_classdev *led_cdev,
535 struct led_trigger *trigger)
536{
537 return 0;
538}
539
540static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
541static inline void led_set_trigger_data(struct led_classdev *led_cdev) {}
542static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
543{
544 return NULL;
545}
546
547#endif /* CONFIG_LEDS_TRIGGERS */
548
549/* Trigger specific enum */
550enum led_trigger_netdev_modes {
551 TRIGGER_NETDEV_LINK = 0,
552 TRIGGER_NETDEV_LINK_10,
553 TRIGGER_NETDEV_LINK_100,
554 TRIGGER_NETDEV_LINK_1000,
555 TRIGGER_NETDEV_LINK_2500,
556 TRIGGER_NETDEV_LINK_5000,
557 TRIGGER_NETDEV_LINK_10000,
558 TRIGGER_NETDEV_HALF_DUPLEX,
559 TRIGGER_NETDEV_FULL_DUPLEX,
560 TRIGGER_NETDEV_TX,
561 TRIGGER_NETDEV_RX,
562
563 /* Keep last */
564 __TRIGGER_NETDEV_MAX,
565};
566
567/* Trigger specific functions */
568#ifdef CONFIG_LEDS_TRIGGER_DISK
569void ledtrig_disk_activity(bool write);
570#else
571static inline void ledtrig_disk_activity(bool write) {}
572#endif
573
574#ifdef CONFIG_LEDS_TRIGGER_MTD
575void ledtrig_mtd_activity(void);
576#else
577static inline void ledtrig_mtd_activity(void) {}
578#endif
579
580#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
581void ledtrig_flash_ctrl(bool on);
582void ledtrig_torch_ctrl(bool on);
583#else
584static inline void ledtrig_flash_ctrl(bool on) {}
585static inline void ledtrig_torch_ctrl(bool on) {}
586#endif
587
588/*
589 * Generic LED platform data for describing LED names and default triggers.
590 */
591struct led_info {
592 const char *name;
593 const char *default_trigger;
594 int flags;
595};
596
597struct led_platform_data {
598 int num_leds;
599 struct led_info *leds;
600};
601
602struct led_properties {
603 u32 color;
604 bool color_present;
605 const char *function;
606 u32 func_enum;
607 bool func_enum_present;
608 const char *label;
609};
610
611typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
612 unsigned long *delay_on,
613 unsigned long *delay_off);
614
615/* For the leds-gpio driver */
616struct gpio_led {
617 const char *name;
618 const char *default_trigger;
619 unsigned gpio;
620 unsigned active_low : 1;
621 unsigned retain_state_suspended : 1;
622 unsigned panic_indicator : 1;
623 unsigned default_state : 2;
624 unsigned retain_state_shutdown : 1;
625 /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
626 struct gpio_desc *gpiod;
627};
628#define LEDS_GPIO_DEFSTATE_OFF LEDS_DEFSTATE_OFF
629#define LEDS_GPIO_DEFSTATE_ON LEDS_DEFSTATE_ON
630#define LEDS_GPIO_DEFSTATE_KEEP LEDS_DEFSTATE_KEEP
631
632struct gpio_led_platform_data {
633 int num_leds;
634 const struct gpio_led *leds;
635
636#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
637#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
638#define GPIO_LED_BLINK 2 /* Please, blink */
639 gpio_blink_set_t gpio_blink_set;
640};
641
642#ifdef CONFIG_LEDS_GPIO_REGISTER
643struct platform_device *gpio_led_register_device(
644 int id, const struct gpio_led_platform_data *pdata);
645#else
646static inline struct platform_device *gpio_led_register_device(
647 int id, const struct gpio_led_platform_data *pdata)
648{
649 return 0;
650}
651#endif
652
653enum cpu_led_event {
654 CPU_LED_IDLE_START, /* CPU enters idle */
655 CPU_LED_IDLE_END, /* CPU idle ends */
656 CPU_LED_START, /* Machine starts, especially resume */
657 CPU_LED_STOP, /* Machine stops, especially suspend */
658 CPU_LED_HALTED, /* Machine shutdown */
659};
660#ifdef CONFIG_LEDS_TRIGGER_CPU
661void ledtrig_cpu(enum cpu_led_event evt);
662#else
663static inline void ledtrig_cpu(enum cpu_led_event evt)
664{
665 return;
666}
667#endif
668
669#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
670void led_classdev_notify_brightness_hw_changed(
671 struct led_classdev *led_cdev, unsigned int brightness);
672#else
673static inline void led_classdev_notify_brightness_hw_changed(
674 struct led_classdev *led_cdev, enum led_brightness brightness) { }
675#endif
676
677/**
678 * struct led_pattern - pattern interval settings
679 * @delta_t: pattern interval delay, in milliseconds
680 * @brightness: pattern interval brightness
681 */
682struct led_pattern {
683 u32 delta_t;
684 int brightness;
685};
686
687enum led_audio {
688 LED_AUDIO_MUTE, /* master mute LED */
689 LED_AUDIO_MICMUTE, /* mic mute LED */
690 NUM_AUDIO_LEDS
691};
692
693#if IS_ENABLED(CONFIG_LEDS_TRIGGER_AUDIO)
694enum led_brightness ledtrig_audio_get(enum led_audio type);
695void ledtrig_audio_set(enum led_audio type, enum led_brightness state);
696#else
697static inline enum led_brightness ledtrig_audio_get(enum led_audio type)
698{
699 return LED_OFF;
700}
701static inline void ledtrig_audio_set(enum led_audio type,
702 enum led_brightness state)
703{
704}
705#endif
706
707#endif /* __LINUX_LEDS_H_INCLUDED */
708

source code of linux/include/linux/leds.h