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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/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32/* This is obsolete/useless.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#define LED_REJECT_NAME_CONFLICT BIT(24)
111#define LED_MULTI_COLOR BIT(25)
112
113 /* set_brightness_work / blink_timer flags, atomic, private. */
114 unsigned long work_flags;
115
116#define LED_BLINK_SW 0
117#define LED_BLINK_ONESHOT 1
118#define LED_BLINK_ONESHOT_STOP 2
119#define LED_BLINK_INVERT 3
120#define LED_BLINK_BRIGHTNESS_CHANGE 4
121#define LED_BLINK_DISABLE 5
122 /* Brightness off also disables hw-blinking so it is a separate action */
123#define LED_SET_BRIGHTNESS_OFF 6
124#define LED_SET_BRIGHTNESS 7
125#define LED_SET_BLINK 8
126
127 /* Set LED brightness level
128 * Must not sleep. Use brightness_set_blocking for drivers
129 * that can sleep while setting brightness.
130 */
131 void (*brightness_set)(struct led_classdev *led_cdev,
132 enum led_brightness brightness);
133 /*
134 * Set LED brightness level immediately - it can block the caller for
135 * the time required for accessing a LED device register.
136 */
137 int (*brightness_set_blocking)(struct led_classdev *led_cdev,
138 enum led_brightness brightness);
139 /* Get LED brightness level */
140 enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
141
142 /*
143 * Activate hardware accelerated blink, delays are in milliseconds
144 * and if both are zero then a sensible default should be chosen.
145 * The call should adjust the timings in that case and if it can't
146 * match the values specified exactly.
147 * Deactivate blinking again when the brightness is set to LED_OFF
148 * via the brightness_set() callback.
149 * For led_blink_set_nosleep() the LED core assumes that blink_set
150 * implementations, of drivers which do not use brightness_set_blocking,
151 * will not sleep. Therefor if brightness_set_blocking is not set
152 * this function must not sleep!
153 */
154 int (*blink_set)(struct led_classdev *led_cdev,
155 unsigned long *delay_on,
156 unsigned long *delay_off);
157
158 int (*pattern_set)(struct led_classdev *led_cdev,
159 struct led_pattern *pattern, u32 len, int repeat);
160 int (*pattern_clear)(struct led_classdev *led_cdev);
161
162 struct device *dev;
163 const struct attribute_group **groups;
164
165 struct list_head node; /* LED Device list */
166 const char *default_trigger; /* Trigger to use */
167
168 unsigned long blink_delay_on, blink_delay_off;
169 struct timer_list blink_timer;
170 int blink_brightness;
171 int new_blink_brightness;
172 void (*flash_resume)(struct led_classdev *led_cdev);
173
174 struct workqueue_struct *wq; /* LED workqueue */
175 struct work_struct set_brightness_work;
176 int delayed_set_value;
177 unsigned long delayed_delay_on;
178 unsigned long delayed_delay_off;
179
180#ifdef CONFIG_LEDS_TRIGGERS
181 /* Protects the trigger data below */
182 struct rw_semaphore trigger_lock;
183
184 struct led_trigger *trigger;
185 struct list_head trig_list;
186 void *trigger_data;
187 /* true if activated - deactivate routine uses it to do cleanup */
188 bool activated;
189
190 /* LEDs that have private triggers have this set */
191 struct led_hw_trigger_type *trigger_type;
192
193 /* Unique trigger name supported by LED set in hw control mode */
194 const char *hw_control_trigger;
195 /*
196 * Check if the LED driver supports the requested mode provided by the
197 * defined supported trigger to setup the LED to hw control mode.
198 *
199 * Return 0 on success. Return -EOPNOTSUPP when the passed flags are not
200 * supported and software fallback needs to be used.
201 * Return a negative error number on any other case for check fail due
202 * to various reason like device not ready or timeouts.
203 */
204 int (*hw_control_is_supported)(struct led_classdev *led_cdev,
205 unsigned long flags);
206 /*
207 * Activate hardware control, LED driver will use the provided flags
208 * from the supported trigger and setup the LED to be driven by hardware
209 * following the requested mode from the trigger flags.
210 * Deactivate hardware blink control by setting brightness to LED_OFF via
211 * the brightness_set() callback.
212 *
213 * Return 0 on success, a negative error number on flags apply fail.
214 */
215 int (*hw_control_set)(struct led_classdev *led_cdev,
216 unsigned long flags);
217 /*
218 * Get from the LED driver the current mode that the LED is set in hw
219 * control mode and put them in flags.
220 * Trigger can use this to get the initial state of a LED already set in
221 * hardware blink control.
222 *
223 * Return 0 on success, a negative error number on failing parsing the
224 * initial mode. Error from this function is NOT FATAL as the device
225 * may be in a not supported initial state by the attached LED trigger.
226 */
227 int (*hw_control_get)(struct led_classdev *led_cdev,
228 unsigned long *flags);
229 /*
230 * Get the device this LED blinks in response to.
231 * e.g. for a PHY LED, it is the network device. If the LED is
232 * not yet associated to a device, return NULL.
233 */
234 struct device *(*hw_control_get_device)(struct led_classdev *led_cdev);
235#endif
236
237#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
238 int brightness_hw_changed;
239 struct kernfs_node *brightness_hw_changed_kn;
240#endif
241
242 /* Ensures consistent access to the LED class device */
243 struct mutex led_access;
244};
245
246/**
247 * led_classdev_register_ext - register a new object of LED class with
248 * init data
249 * @parent: LED controller device this LED is driven by
250 * @led_cdev: the led_classdev structure for this device
251 * @init_data: the LED class device initialization data
252 *
253 * Register a new object of LED class, with name derived from init_data.
254 *
255 * Returns: 0 on success or negative error value on failure
256 */
257int led_classdev_register_ext(struct device *parent,
258 struct led_classdev *led_cdev,
259 struct led_init_data *init_data);
260
261/**
262 * led_classdev_register - register a new object of LED class
263 * @parent: LED controller device this LED is driven by
264 * @led_cdev: the led_classdev structure for this device
265 *
266 * Register a new object of LED class, with name derived from the name property
267 * of passed led_cdev argument.
268 *
269 * Returns: 0 on success or negative error value on failure
270 */
271static inline int led_classdev_register(struct device *parent,
272 struct led_classdev *led_cdev)
273{
274 return led_classdev_register_ext(parent, led_cdev, NULL);
275}
276
277int devm_led_classdev_register_ext(struct device *parent,
278 struct led_classdev *led_cdev,
279 struct led_init_data *init_data);
280static inline int devm_led_classdev_register(struct device *parent,
281 struct led_classdev *led_cdev)
282{
283 return devm_led_classdev_register_ext(parent, led_cdev, NULL);
284}
285void led_classdev_unregister(struct led_classdev *led_cdev);
286void devm_led_classdev_unregister(struct device *parent,
287 struct led_classdev *led_cdev);
288void led_classdev_suspend(struct led_classdev *led_cdev);
289void led_classdev_resume(struct led_classdev *led_cdev);
290
291void led_add_lookup(struct led_lookup_data *led_lookup);
292void led_remove_lookup(struct led_lookup_data *led_lookup);
293
294struct led_classdev *__must_check led_get(struct device *dev, char *con_id);
295struct led_classdev *__must_check devm_led_get(struct device *dev, char *con_id);
296
297extern void led_put(struct led_classdev *led_cdev);
298struct led_classdev *__must_check devm_of_led_get(struct device *dev,
299 int index);
300struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev,
301 int index);
302
303/**
304 * led_blink_set - set blinking with software fallback
305 * @led_cdev: the LED to start blinking
306 * @delay_on: the time it should be on (in ms)
307 * @delay_off: the time it should ble off (in ms)
308 *
309 * This function makes the LED blink, attempting to use the
310 * hardware acceleration if possible, but falling back to
311 * software blinking if there is no hardware blinking or if
312 * the LED refuses the passed values.
313 *
314 * This function may sleep!
315 *
316 * Note that if software blinking is active, simply calling
317 * led_cdev->brightness_set() will not stop the blinking,
318 * use led_set_brightness() instead.
319 */
320void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
321 unsigned long *delay_off);
322
323/**
324 * led_blink_set_nosleep - set blinking, guaranteed to not sleep
325 * @led_cdev: the LED to start blinking
326 * @delay_on: the time it should be on (in ms)
327 * @delay_off: the time it should ble off (in ms)
328 *
329 * This function makes the LED blink and is guaranteed to not sleep. Otherwise
330 * this is the same as led_blink_set(), see led_blink_set() for details.
331 */
332void led_blink_set_nosleep(struct led_classdev *led_cdev, unsigned long delay_on,
333 unsigned long delay_off);
334
335/**
336 * led_blink_set_oneshot - do a oneshot software blink
337 * @led_cdev: the LED to start blinking
338 * @delay_on: the time it should be on (in ms)
339 * @delay_off: the time it should ble off (in ms)
340 * @invert: blink off, then on, leaving the led on
341 *
342 * This function makes the LED blink one time for delay_on +
343 * delay_off time, ignoring the request if another one-shot
344 * blink is already in progress.
345 *
346 * If invert is set, led blinks for delay_off first, then for
347 * delay_on and leave the led on after the on-off cycle.
348 *
349 * This function is guaranteed not to sleep.
350 */
351void led_blink_set_oneshot(struct led_classdev *led_cdev,
352 unsigned long *delay_on, unsigned long *delay_off,
353 int invert);
354/**
355 * led_set_brightness - set LED brightness
356 * @led_cdev: the LED to set
357 * @brightness: the brightness to set it to
358 *
359 * Set an LED's brightness, and, if necessary, cancel the
360 * software blink timer that implements blinking when the
361 * hardware doesn't. This function is guaranteed not to sleep.
362 */
363void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness);
364
365/**
366 * led_set_brightness_sync - set LED brightness synchronously
367 * @led_cdev: the LED to set
368 * @value: the brightness to set it to
369 *
370 * Set an LED's brightness immediately. This function will block
371 * the caller for the time required for accessing device registers,
372 * and it can sleep.
373 *
374 * Returns: 0 on success or negative error value on failure
375 */
376int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value);
377
378/**
379 * led_mc_set_brightness - set mc LED color intensity values and brightness
380 * @led_cdev: the LED to set
381 * @intensity_value: array of per color intensity values to set
382 * @num_colors: amount of entries in intensity_value array
383 * @brightness: the brightness to set the LED to
384 *
385 * Set a multi-color LED's per color intensity values and brightness.
386 * If necessary, this cancels the software blink timer. This function is
387 * guaranteed not to sleep.
388 *
389 * Calling this function on a non multi-color led_classdev or with the wrong
390 * num_colors value is an error. In this case an error will be logged once
391 * and the call will do nothing.
392 */
393void led_mc_set_brightness(struct led_classdev *led_cdev,
394 unsigned int *intensity_value, unsigned int num_colors,
395 unsigned int brightness);
396
397/**
398 * led_update_brightness - update LED brightness
399 * @led_cdev: the LED to query
400 *
401 * Get an LED's current brightness and update led_cdev->brightness
402 * member with the obtained value.
403 *
404 * Returns: 0 on success or negative error value on failure
405 */
406int led_update_brightness(struct led_classdev *led_cdev);
407
408/**
409 * led_get_default_pattern - return default pattern
410 *
411 * @led_cdev: the LED to get default pattern for
412 * @size: pointer for storing the number of elements in returned array,
413 * modified only if return != NULL
414 *
415 * Return: Allocated array of integers with default pattern from device tree
416 * or NULL. Caller is responsible for kfree().
417 */
418u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size);
419
420/**
421 * led_sysfs_disable - disable LED sysfs interface
422 * @led_cdev: the LED to set
423 *
424 * Disable the led_cdev's sysfs interface.
425 */
426void led_sysfs_disable(struct led_classdev *led_cdev);
427
428/**
429 * led_sysfs_enable - enable LED sysfs interface
430 * @led_cdev: the LED to set
431 *
432 * Enable the led_cdev's sysfs interface.
433 */
434void led_sysfs_enable(struct led_classdev *led_cdev);
435
436/**
437 * led_compose_name - compose LED class device name
438 * @dev: LED controller device object
439 * @init_data: the LED class device initialization data
440 * @led_classdev_name: composed LED class device name
441 *
442 * Create LED class device name basing on the provided init_data argument.
443 * The name can have <devicename:color:function> or <color:function>.
444 * form, depending on the init_data configuration.
445 *
446 * Returns: 0 on success or negative error value on failure
447 */
448int led_compose_name(struct device *dev, struct led_init_data *init_data,
449 char *led_classdev_name);
450
451/**
452 * led_get_color_name - get string representation of color ID
453 * @color_id: The LED_COLOR_ID_* constant
454 *
455 * Get the string name of a LED_COLOR_ID_* constant.
456 *
457 * Returns: A string constant or NULL on an invalid ID.
458 */
459const char *led_get_color_name(u8 color_id);
460
461/**
462 * led_sysfs_is_disabled - check if LED sysfs interface is disabled
463 * @led_cdev: the LED to query
464 *
465 * Returns: true if the led_cdev's sysfs interface is disabled.
466 */
467static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
468{
469 return led_cdev->flags & LED_SYSFS_DISABLE;
470}
471
472/*
473 * LED Triggers
474 */
475/* Registration functions for simple triggers */
476#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
477#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
478
479#ifdef CONFIG_LEDS_TRIGGERS
480
481#define TRIG_NAME_MAX 50
482
483struct led_trigger {
484 /* Trigger Properties */
485 const char *name;
486 int (*activate)(struct led_classdev *led_cdev);
487 void (*deactivate)(struct led_classdev *led_cdev);
488
489 /* Brightness set by led_trigger_event */
490 enum led_brightness brightness;
491
492 /* LED-private triggers have this set */
493 struct led_hw_trigger_type *trigger_type;
494
495 /* LEDs under control by this trigger (for simple triggers) */
496 spinlock_t leddev_list_lock;
497 struct list_head led_cdevs;
498
499 /* Link to next registered trigger */
500 struct list_head next_trig;
501
502 const struct attribute_group **groups;
503};
504
505/*
506 * Currently the attributes in struct led_trigger::groups are added directly to
507 * the LED device. As this might change in the future, the following
508 * macros abstract getting the LED device and its trigger_data from the dev
509 * parameter passed to the attribute accessor functions.
510 */
511#define led_trigger_get_led(dev) ((struct led_classdev *)dev_get_drvdata((dev)))
512#define led_trigger_get_drvdata(dev) (led_get_trigger_data(led_trigger_get_led(dev)))
513
514/* Registration functions for complex triggers */
515int led_trigger_register(struct led_trigger *trigger);
516void led_trigger_unregister(struct led_trigger *trigger);
517int devm_led_trigger_register(struct device *dev,
518 struct led_trigger *trigger);
519
520void led_trigger_register_simple(const char *name,
521 struct led_trigger **trigger);
522void led_trigger_unregister_simple(struct led_trigger *trigger);
523void led_trigger_event(struct led_trigger *trigger, enum led_brightness event);
524void led_mc_trigger_event(struct led_trigger *trig,
525 unsigned int *intensity_value, unsigned int num_colors,
526 enum led_brightness brightness);
527void led_trigger_blink(struct led_trigger *trigger, unsigned long delay_on,
528 unsigned long delay_off);
529void led_trigger_blink_oneshot(struct led_trigger *trigger,
530 unsigned long delay_on,
531 unsigned long delay_off,
532 int invert);
533void led_trigger_set_default(struct led_classdev *led_cdev);
534int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger);
535void led_trigger_remove(struct led_classdev *led_cdev);
536
537static inline void led_set_trigger_data(struct led_classdev *led_cdev,
538 void *trigger_data)
539{
540 led_cdev->trigger_data = trigger_data;
541}
542
543static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
544{
545 return led_cdev->trigger_data;
546}
547
548static inline enum led_brightness
549led_trigger_get_brightness(const struct led_trigger *trigger)
550{
551 return trigger ? trigger->brightness : LED_OFF;
552}
553
554#define module_led_trigger(__led_trigger) \
555 module_driver(__led_trigger, led_trigger_register, \
556 led_trigger_unregister)
557
558#else
559
560/* Trigger has no members */
561struct led_trigger {};
562
563/* Trigger inline empty functions */
564static inline void led_trigger_register_simple(const char *name,
565 struct led_trigger **trigger) {}
566static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
567static inline void led_trigger_event(struct led_trigger *trigger,
568 enum led_brightness event) {}
569static inline void led_mc_trigger_event(struct led_trigger *trig,
570 unsigned int *intensity_value, unsigned int num_colors,
571 enum led_brightness brightness) {}
572static inline void led_trigger_blink(struct led_trigger *trigger,
573 unsigned long delay_on,
574 unsigned long delay_off) {}
575static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
576 unsigned long delay_on,
577 unsigned long delay_off,
578 int invert) {}
579static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
580static inline int led_trigger_set(struct led_classdev *led_cdev,
581 struct led_trigger *trigger)
582{
583 return 0;
584}
585
586static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
587static inline void led_set_trigger_data(struct led_classdev *led_cdev) {}
588static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
589{
590 return NULL;
591}
592
593static inline enum led_brightness
594led_trigger_get_brightness(const struct led_trigger *trigger)
595{
596 return LED_OFF;
597}
598
599#endif /* CONFIG_LEDS_TRIGGERS */
600
601/* Trigger specific enum */
602enum led_trigger_netdev_modes {
603 TRIGGER_NETDEV_LINK = 0,
604 TRIGGER_NETDEV_LINK_10,
605 TRIGGER_NETDEV_LINK_100,
606 TRIGGER_NETDEV_LINK_1000,
607 TRIGGER_NETDEV_LINK_2500,
608 TRIGGER_NETDEV_LINK_5000,
609 TRIGGER_NETDEV_LINK_10000,
610 TRIGGER_NETDEV_HALF_DUPLEX,
611 TRIGGER_NETDEV_FULL_DUPLEX,
612 TRIGGER_NETDEV_TX,
613 TRIGGER_NETDEV_RX,
614 TRIGGER_NETDEV_TX_ERR,
615 TRIGGER_NETDEV_RX_ERR,
616
617 /* Keep last */
618 __TRIGGER_NETDEV_MAX,
619};
620
621/* Trigger specific functions */
622#ifdef CONFIG_LEDS_TRIGGER_DISK
623void ledtrig_disk_activity(bool write);
624#else
625static inline void ledtrig_disk_activity(bool write) {}
626#endif
627
628#ifdef CONFIG_LEDS_TRIGGER_MTD
629void ledtrig_mtd_activity(void);
630#else
631static inline void ledtrig_mtd_activity(void) {}
632#endif
633
634#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
635void ledtrig_flash_ctrl(bool on);
636void ledtrig_torch_ctrl(bool on);
637#else
638static inline void ledtrig_flash_ctrl(bool on) {}
639static inline void ledtrig_torch_ctrl(bool on) {}
640#endif
641
642#if IS_REACHABLE(CONFIG_LEDS_TRIGGER_BACKLIGHT)
643void ledtrig_backlight_blank(bool blank);
644#else
645static inline void ledtrig_backlight_blank(bool blank) {}
646#endif
647
648/*
649 * Generic LED platform data for describing LED names and default triggers.
650 */
651struct led_info {
652 const char *name;
653 const char *default_trigger;
654 int flags;
655};
656
657struct led_platform_data {
658 int num_leds;
659 struct led_info *leds;
660};
661
662struct led_properties {
663 u32 color;
664 bool color_present;
665 const char *function;
666 u32 func_enum;
667 bool func_enum_present;
668 const char *label;
669};
670
671typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
672 unsigned long *delay_on,
673 unsigned long *delay_off);
674
675/* For the leds-gpio driver */
676struct gpio_led {
677 const char *name;
678 const char *default_trigger;
679 unsigned gpio;
680 unsigned active_low : 1;
681 unsigned retain_state_suspended : 1;
682 unsigned panic_indicator : 1;
683 unsigned default_state : 2;
684 unsigned retain_state_shutdown : 1;
685 /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
686 struct gpio_desc *gpiod;
687};
688#define LEDS_GPIO_DEFSTATE_OFF LEDS_DEFSTATE_OFF
689#define LEDS_GPIO_DEFSTATE_ON LEDS_DEFSTATE_ON
690#define LEDS_GPIO_DEFSTATE_KEEP LEDS_DEFSTATE_KEEP
691
692struct gpio_led_platform_data {
693 int num_leds;
694 const struct gpio_led *leds;
695
696#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
697#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
698#define GPIO_LED_BLINK 2 /* Please, blink */
699 gpio_blink_set_t gpio_blink_set;
700};
701
702#ifdef CONFIG_LEDS_GPIO_REGISTER
703struct platform_device *gpio_led_register_device(
704 int id, const struct gpio_led_platform_data *pdata);
705#else
706static inline struct platform_device *gpio_led_register_device(
707 int id, const struct gpio_led_platform_data *pdata)
708{
709 return 0;
710}
711#endif
712
713enum cpu_led_event {
714 CPU_LED_IDLE_START, /* CPU enters idle */
715 CPU_LED_IDLE_END, /* CPU idle ends */
716 CPU_LED_START, /* Machine starts, especially resume */
717 CPU_LED_STOP, /* Machine stops, especially suspend */
718 CPU_LED_HALTED, /* Machine shutdown */
719};
720#ifdef CONFIG_LEDS_TRIGGER_CPU
721void ledtrig_cpu(enum cpu_led_event evt);
722#else
723static inline void ledtrig_cpu(enum cpu_led_event evt)
724{
725 return;
726}
727#endif
728
729#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
730void led_classdev_notify_brightness_hw_changed(
731 struct led_classdev *led_cdev, unsigned int brightness);
732#else
733static inline void led_classdev_notify_brightness_hw_changed(
734 struct led_classdev *led_cdev, enum led_brightness brightness) { }
735#endif
736
737/**
738 * struct led_pattern - pattern interval settings
739 * @delta_t: pattern interval delay, in milliseconds
740 * @brightness: pattern interval brightness
741 */
742struct led_pattern {
743 u32 delta_t;
744 int brightness;
745};
746
747enum led_audio {
748 LED_AUDIO_MUTE, /* master mute LED */
749 LED_AUDIO_MICMUTE, /* mic mute LED */
750 NUM_AUDIO_LEDS
751};
752
753#endif /* __LINUX_LEDS_H_INCLUDED */
754

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