[deliverable/linux.git] / include / linux / leds.h

/*
 * Driver model for leds and led triggers
 *
 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
 * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */
#ifndef __LINUX_LEDS_H_INCLUDED
#define __LINUX_LEDS_H_INCLUDED

#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/workqueue.h>

struct device;
/*
 * LED Core
 */

enum led_brightness {
	LED_OFF		= 0,
	LED_HALF	= 127,
	LED_FULL	= 255,
};

struct led_classdev {
	const char		*name;
	enum led_brightness	 brightness;
	enum led_brightness	 max_brightness;
	int			 flags;

	/* Lower 16 bits reflect status */
#define LED_SUSPENDED		(1 << 0)
#define LED_UNREGISTERING	(1 << 1)
	/* Upper 16 bits reflect control information */
#define LED_CORE_SUSPENDRESUME	(1 << 16)
#define LED_BLINK_ONESHOT	(1 << 17)
#define LED_BLINK_ONESHOT_STOP	(1 << 18)
#define LED_BLINK_INVERT	(1 << 19)
#define LED_BLINK_BRIGHTNESS_CHANGE (1 << 20)
#define LED_BLINK_DISABLE	(1 << 21)
#define LED_SYSFS_DISABLE	(1 << 22)
#define LED_DEV_CAP_FLASH	(1 << 23)
#define LED_HW_PLUGGABLE	(1 << 24)

	/* Set LED brightness level
	 * Must not sleep. Use brightness_set_blocking for drivers
	 * that can sleep while setting brightness.
	 */
	void		(*brightness_set)(struct led_classdev *led_cdev,
					  enum led_brightness brightness);
	/*
	 * Set LED brightness level immediately - it can block the caller for
	 * the time required for accessing a LED device register.
	 */
	int (*brightness_set_blocking)(struct led_classdev *led_cdev,
				       enum led_brightness brightness);
	/* Get LED brightness level */
	enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);

	/*
	 * Activate hardware accelerated blink, delays are in milliseconds
	 * and if both are zero then a sensible default should be chosen.
	 * The call should adjust the timings in that case and if it can't
	 * match the values specified exactly.
	 * Deactivate blinking again when the brightness is set to a fixed
	 * value via the brightness_set() callback.
	 */
	int		(*blink_set)(struct led_classdev *led_cdev,
				     unsigned long *delay_on,
				     unsigned long *delay_off);

	struct device		*dev;
	const struct attribute_group	**groups;

	struct list_head	 node;			/* LED Device list */
	const char		*default_trigger;	/* Trigger to use */

	unsigned long		 blink_delay_on, blink_delay_off;
	struct timer_list	 blink_timer;
	int			 blink_brightness;
	void			(*flash_resume)(struct led_classdev *led_cdev);

	struct work_struct	set_brightness_work;
	int			delayed_set_value;

#ifdef CONFIG_LEDS_TRIGGERS
	/* Protects the trigger data below */
	struct rw_semaphore	 trigger_lock;

	struct led_trigger	*trigger;
	struct list_head	 trig_list;
	void			*trigger_data;
	/* true if activated - deactivate routine uses it to do cleanup */
	bool			activated;
#endif

	/* Ensures consistent access to the LED Flash Class device */
	struct mutex		led_access;
};

extern int led_classdev_register(struct device *parent,
				 struct led_classdev *led_cdev);
extern int devm_led_classdev_register(struct device *parent,
				      struct led_classdev *led_cdev);
extern void led_classdev_unregister(struct led_classdev *led_cdev);
extern void devm_led_classdev_unregister(struct device *parent,
					 struct led_classdev *led_cdev);
extern void led_classdev_suspend(struct led_classdev *led_cdev);
extern void led_classdev_resume(struct led_classdev *led_cdev);

/**
 * led_blink_set - set blinking with software fallback
 * @led_cdev: the LED to start blinking
 * @delay_on: the time it should be on (in ms)
 * @delay_off: the time it should ble off (in ms)
 *
 * This function makes the LED blink, attempting to use the
 * hardware acceleration if possible, but falling back to
 * software blinking if there is no hardware blinking or if
 * the LED refuses the passed values.
 *
 * Note that if software blinking is active, simply calling
 * led_cdev->brightness_set() will not stop the blinking,
 * use led_classdev_brightness_set() instead.
 */
extern void led_blink_set(struct led_classdev *led_cdev,
			  unsigned long *delay_on,
			  unsigned long *delay_off);
/**
 * led_blink_set_oneshot - do a oneshot software blink
 * @led_cdev: the LED to start blinking
 * @delay_on: the time it should be on (in ms)
 * @delay_off: the time it should ble off (in ms)
 * @invert: blink off, then on, leaving the led on
 *
 * This function makes the LED blink one time for delay_on +
 * delay_off time, ignoring the request if another one-shot
 * blink is already in progress.
 *
 * If invert is set, led blinks for delay_off first, then for
 * delay_on and leave the led on after the on-off cycle.
 */
extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
				  unsigned long *delay_on,
				  unsigned long *delay_off,
				  int invert);
/**
 * led_set_brightness - set LED brightness
 * @led_cdev: the LED to set
 * @brightness: the brightness to set it to
 *
 * Set an LED's brightness, and, if necessary, cancel the
 * software blink timer that implements blinking when the
 * hardware doesn't. This function is guaranteed not to sleep.
 */
extern void led_set_brightness(struct led_classdev *led_cdev,
			       enum led_brightness brightness);

/**
 * led_set_brightness_sync - set LED brightness synchronously
 * @led_cdev: the LED to set
 * @brightness: the brightness to set it to
 *
 * Set an LED's brightness immediately. This function will block
 * the caller for the time required for accessing device registers,
 * and it can sleep.
 *
 * Returns: 0 on success or negative error value on failure
 */
extern int led_set_brightness_sync(struct led_classdev *led_cdev,
				   enum led_brightness value);

/**
 * led_update_brightness - update LED brightness
 * @led_cdev: the LED to query
 *
 * Get an LED's current brightness and update led_cdev->brightness
 * member with the obtained value.
 *
 * Returns: 0 on success or negative error value on failure
 */
extern int led_update_brightness(struct led_classdev *led_cdev);

/**
 * led_sysfs_disable - disable LED sysfs interface
 * @led_cdev: the LED to set
 *
 * Disable the led_cdev's sysfs interface.
 */
extern void led_sysfs_disable(struct led_classdev *led_cdev);

/**
 * led_sysfs_enable - enable LED sysfs interface
 * @led_cdev: the LED to set
 *
 * Enable the led_cdev's sysfs interface.
 */
extern void led_sysfs_enable(struct led_classdev *led_cdev);

/**
 * led_sysfs_is_disabled - check if LED sysfs interface is disabled
 * @led_cdev: the LED to query
 *
 * Returns: true if the led_cdev's sysfs interface is disabled.
 */
static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
{
	return led_cdev->flags & LED_SYSFS_DISABLE;
}

/*
 * LED Triggers
 */
/* Registration functions for simple triggers */
#define DEFINE_LED_TRIGGER(x)		static struct led_trigger *x;
#define DEFINE_LED_TRIGGER_GLOBAL(x)	struct led_trigger *x;

#ifdef CONFIG_LEDS_TRIGGERS

#define TRIG_NAME_MAX 50

struct led_trigger {
	/* Trigger Properties */
	const char	 *name;
	void		(*activate)(struct led_classdev *led_cdev);
	void		(*deactivate)(struct led_classdev *led_cdev);

	/* LEDs under control by this trigger (for simple triggers) */
	rwlock_t	  leddev_list_lock;
	struct list_head  led_cdevs;

	/* Link to next registered trigger */
	struct list_head  next_trig;
};

ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count);
ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
			char *buf);

/* Registration functions for complex triggers */
extern int led_trigger_register(struct led_trigger *trigger);
extern void led_trigger_unregister(struct led_trigger *trigger);
extern int devm_led_trigger_register(struct device *dev,
				     struct led_trigger *trigger);

extern void led_trigger_register_simple(const char *name,
				struct led_trigger **trigger);
extern void led_trigger_unregister_simple(struct led_trigger *trigger);
extern void led_trigger_event(struct led_trigger *trigger,
				enum led_brightness event);
extern void led_trigger_blink(struct led_trigger *trigger,
			      unsigned long *delay_on,
			      unsigned long *delay_off);
extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
				      unsigned long *delay_on,
				      unsigned long *delay_off,
				      int invert);
extern void led_trigger_set_default(struct led_classdev *led_cdev);
extern void led_trigger_set(struct led_classdev *led_cdev,
			struct led_trigger *trigger);
extern void led_trigger_remove(struct led_classdev *led_cdev);

static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
{
	return led_cdev->trigger_data;
}

/**
 * led_trigger_rename_static - rename a trigger
 * @name: the new trigger name
 * @trig: the LED trigger to rename
 *
 * Change a LED trigger name by copying the string passed in
 * name into current trigger name, which MUST be large
 * enough for the new string.
 *
 * Note that name must NOT point to the same string used
 * during LED registration, as that could lead to races.
 *
 * This is meant to be used on triggers with statically
 * allocated name.
 */
extern void led_trigger_rename_static(const char *name,
				      struct led_trigger *trig);

#else

/* Trigger has no members */
struct led_trigger {};

/* Trigger inline empty functions */
static inline void led_trigger_register_simple(const char *name,
					struct led_trigger **trigger) {}
static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
static inline void led_trigger_event(struct led_trigger *trigger,
				enum led_brightness event) {}
static inline void led_trigger_blink(struct led_trigger *trigger,
				      unsigned long *delay_on,
				      unsigned long *delay_off) {}
static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
				      unsigned long *delay_on,
				      unsigned long *delay_off,
				      int invert) {}
static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
static inline void led_trigger_set(struct led_classdev *led_cdev,
				struct led_trigger *trigger) {}
static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
{
	return NULL;
}

#endif /* CONFIG_LEDS_TRIGGERS */

/* Trigger specific functions */
#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
extern void ledtrig_ide_activity(void);
#else
static inline void ledtrig_ide_activity(void) {}
#endif

#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
extern void ledtrig_flash_ctrl(bool on);
extern void ledtrig_torch_ctrl(bool on);
#else
static inline void ledtrig_flash_ctrl(bool on) {}
static inline void ledtrig_torch_ctrl(bool on) {}
#endif

/*
 * Generic LED platform data for describing LED names and default triggers.
 */
struct led_info {
	const char	*name;
	const char	*default_trigger;
	int		flags;
};

struct led_platform_data {
	int		num_leds;
	struct led_info	*leds;
};

/* For the leds-gpio driver */
struct gpio_led {
	const char *name;
	const char *default_trigger;
	unsigned 	gpio;
	unsigned	active_low : 1;
	unsigned	retain_state_suspended : 1;
	unsigned	default_state : 2;
	/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
	struct gpio_desc *gpiod;
};
#define LEDS_GPIO_DEFSTATE_OFF		0
#define LEDS_GPIO_DEFSTATE_ON		1
#define LEDS_GPIO_DEFSTATE_KEEP		2

struct gpio_led_platform_data {
	int 		num_leds;
	const struct gpio_led *leds;

#define GPIO_LED_NO_BLINK_LOW	0	/* No blink GPIO state low */
#define GPIO_LED_NO_BLINK_HIGH	1	/* No blink GPIO state high */
#define GPIO_LED_BLINK		2	/* Please, blink */
	int		(*gpio_blink_set)(struct gpio_desc *desc, int state,
					unsigned long *delay_on,
					unsigned long *delay_off);
};

struct platform_device *gpio_led_register_device(
		int id, const struct gpio_led_platform_data *pdata);

enum cpu_led_event {
	CPU_LED_IDLE_START,	/* CPU enters idle */
	CPU_LED_IDLE_END,	/* CPU idle ends */
	CPU_LED_START,		/* Machine starts, especially resume */
	CPU_LED_STOP,		/* Machine stops, especially suspend */
	CPU_LED_HALTED,		/* Machine shutdown */
};
#ifdef CONFIG_LEDS_TRIGGER_CPU
extern void ledtrig_cpu(enum cpu_led_event evt);
#else
static inline void ledtrig_cpu(enum cpu_led_event evt)
{
	return;
}
#endif

#endif		/* __LINUX_LEDS_H_INCLUDED */
Commit	Line	Data
c72a1d60 RP	1	/*
	2	* Driver model for leds and led triggers
	3	*
	4	* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
	5	* Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12	#ifndef __LINUX_LEDS_H_INCLUDED
	13	#define __LINUX_LEDS_H_INCLUDED
	14
20f56758	15	#include <linux/device.h>
af410fc1	16	#include <linux/list.h>
acd899e4	17	#include <linux/mutex.h>
dc47206e	18	#include <linux/rwsem.h>
04713306	19	#include <linux/spinlock.h>
9067359f	20	#include <linux/timer.h>
d23a22a7	21	#include <linux/workqueue.h>
af410fc1	22
c72a1d60	23	struct device;
c72a1d60 RP	24	/*
	25	* LED Core
	26	*/
	27
	28	enum led_brightness {
fb5035db BD	29	LED_OFF = 0,
	30	LED_HALF = 127,
	31	LED_FULL = 255,
c72a1d60 RP	32	};
	33
	34	struct led_classdev {
fb5035db	35	const char *name;
d8082827 JA	36	enum led_brightness brightness;
d8082827 JA	37	enum led_brightness max_brightness;
fb5035db	38	int flags;
c72a1d60	39
859cb7f2	40	/* Lower 16 bits reflect status */
fb5035db	41	#define LED_SUSPENDED (1 << 0)
d84d80f3	42	#define LED_UNREGISTERING (1 << 1)
859cb7f2 RP	43	/* Upper 16 bits reflect control information */
859cb7f2 RP	44	#define LED_CORE_SUSPENDRESUME (1 << 16)
5bb629c5 FB	45	#define LED_BLINK_ONESHOT (1 << 17)
	46	#define LED_BLINK_ONESHOT_STOP (1 << 18)
	47	#define LED_BLINK_INVERT (1 << 19)
f1e80c07 JA	48	#define LED_BLINK_BRIGHTNESS_CHANGE (1 << 20)
	49	#define LED_BLINK_DISABLE (1 << 21)
	50	#define LED_SYSFS_DISABLE (1 << 22)
13ae79bb	51	#define LED_DEV_CAP_FLASH (1 << 23)
d84d80f3	52	#define LED_HW_PLUGGABLE (1 << 24)
c72a1d60	53
70b2563b HK	54	/* Set LED brightness level
	55	* Must not sleep. Use brightness_set_blocking for drivers
	56	* that can sleep while setting brightness.
	57	*/
fb5035db BD	58	void (brightness_set)(struct led_classdev led_cdev,
fb5035db BD	59	enum led_brightness brightness);
4d71a4a1 JA	60	/*
	61	* Set LED brightness level immediately - it can block the caller for
	62	* the time required for accessing a LED device register.
	63	*/
437a4240 JA	64	int (brightness_set_blocking)(struct led_classdev led_cdev,
437a4240 JA	65	enum led_brightness brightness);
29d76dfa HMH	66	/* Get LED brightness level */
29d76dfa HMH	67	enum led_brightness (brightness_get)(struct led_classdev led_cdev);
fb5035db	68
5ada28bf JB	69	/*
	70	* Activate hardware accelerated blink, delays are in milliseconds
	71	* and if both are zero then a sensible default should be chosen.
	72	* The call should adjust the timings in that case and if it can't
	73	* match the values specified exactly.
	74	* Deactivate blinking again when the brightness is set to a fixed
	75	* value via the brightness_set() callback.
	76	*/
4c79141d MN	77	int (blink_set)(struct led_classdev led_cdev,
	78	unsigned long *delay_on,
	79	unsigned long *delay_off);
	80
f8a7c6fe	81	struct device *dev;
d0d480cc JH	82	const struct attribute_group **groups;
d0d480cc JH	83
fb5035db	84	struct list_head node; /* LED Device list */
781a54e7	85	const char default_trigger; / Trigger to use */
c72a1d60	86
5ada28bf	87	unsigned long blink_delay_on, blink_delay_off;
9067359f	88	struct timer_list blink_timer;
5ada28bf	89	int blink_brightness;
7aea8389	90	void (flash_resume)(struct led_classdev led_cdev);
5ada28bf	91
d23a22a7 FB	92	struct work_struct set_brightness_work;
	93	int delayed_set_value;
	94
c3bc9956	95	#ifdef CONFIG_LEDS_TRIGGERS
c3bc9956	96	/* Protects the trigger data below */
dc47206e	97	struct rw_semaphore trigger_lock;
c3bc9956	98
fb5035db BD	99	struct led_trigger *trigger;
	100	struct list_head trig_list;
	101	void *trigger_data;
b0096182 SK	102	/* true if activated - deactivate routine uses it to do cleanup */
b0096182 SK	103	bool activated;
c3bc9956	104	#endif
acd899e4 JA	105
	106	/* Ensures consistent access to the LED Flash Class device */
	107	struct mutex led_access;
c72a1d60 RP	108	};
	109
	110	extern int led_classdev_register(struct device *parent,
fb5035db	111	struct led_classdev *led_cdev);
ca1bb4ee BA	112	extern int devm_led_classdev_register(struct device *parent,
ca1bb4ee BA	113	struct led_classdev *led_cdev);
e2387d6c	114	extern void led_classdev_unregister(struct led_classdev *led_cdev);
ca1bb4ee BA	115	extern void devm_led_classdev_unregister(struct device *parent,
ca1bb4ee BA	116	struct led_classdev *led_cdev);
c72a1d60 RP	117	extern void led_classdev_suspend(struct led_classdev *led_cdev);
	118	extern void led_classdev_resume(struct led_classdev *led_cdev);
	119
5ada28bf JB	120	/**
	121	* led_blink_set - set blinking with software fallback
	122	* @led_cdev: the LED to start blinking
	123	* @delay_on: the time it should be on (in ms)
	124	* @delay_off: the time it should ble off (in ms)
	125	*
	126	* This function makes the LED blink, attempting to use the
	127	* hardware acceleration if possible, but falling back to
	128	* software blinking if there is no hardware blinking or if
	129	* the LED refuses the passed values.
	130	*
	131	* Note that if software blinking is active, simply calling
	132	* led_cdev->brightness_set() will not stop the blinking,
	133	* use led_classdev_brightness_set() instead.
	134	*/
	135	extern void led_blink_set(struct led_classdev *led_cdev,
	136	unsigned long *delay_on,
	137	unsigned long *delay_off);
5bb629c5 FB	138	/**
	139	* led_blink_set_oneshot - do a oneshot software blink
	140	* @led_cdev: the LED to start blinking
	141	* @delay_on: the time it should be on (in ms)
	142	* @delay_off: the time it should ble off (in ms)
	143	* @invert: blink off, then on, leaving the led on
	144	*
	145	* This function makes the LED blink one time for delay_on +
	146	* delay_off time, ignoring the request if another one-shot
	147	* blink is already in progress.
	148	*
	149	* If invert is set, led blinks for delay_off first, then for
	150	* delay_on and leave the led on after the on-off cycle.
	151	*/
	152	extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
	153	unsigned long *delay_on,
	154	unsigned long *delay_off,
	155	int invert);
5ada28bf	156	/**
19cd67e2	157	* led_set_brightness - set LED brightness
5ada28bf JB	158	* @led_cdev: the LED to set
	159	* @brightness: the brightness to set it to
	160	*
	161	* Set an LED's brightness, and, if necessary, cancel the
	162	* software blink timer that implements blinking when the
1afcadfc	163	* hardware doesn't. This function is guaranteed not to sleep.
5ada28bf	164	*/
19cd67e2	165	extern void led_set_brightness(struct led_classdev *led_cdev,
5ada28bf	166	enum led_brightness brightness);
13ae79bb JA	167
	168	/**
	169	* led_set_brightness_sync - set LED brightness synchronously
	170	* @led_cdev: the LED to set
	171	* @brightness: the brightness to set it to
	172	*
	173	* Set an LED's brightness immediately. This function will block
	174	* the caller for the time required for accessing device registers,
	175	* and it can sleep.
	176	*
	177	* Returns: 0 on success or negative error value on failure
	178	*/
	179	extern int led_set_brightness_sync(struct led_classdev *led_cdev,
	180	enum led_brightness value);
	181
3ef7de53 JA	182	/**
	183	* led_update_brightness - update LED brightness
	184	* @led_cdev: the LED to query
	185	*
	186	* Get an LED's current brightness and update led_cdev->brightness
	187	* member with the obtained value.
	188	*
	189	* Returns: 0 on success or negative error value on failure
	190	*/
	191	extern int led_update_brightness(struct led_classdev *led_cdev);
5ada28bf	192
acd899e4 JA	193	/**
	194	* led_sysfs_disable - disable LED sysfs interface
	195	* @led_cdev: the LED to set
	196	*
	197	* Disable the led_cdev's sysfs interface.
	198	*/
	199	extern void led_sysfs_disable(struct led_classdev *led_cdev);
	200
	201	/**
	202	* led_sysfs_enable - enable LED sysfs interface
	203	* @led_cdev: the LED to set
	204	*
	205	* Enable the led_cdev's sysfs interface.
	206	*/
	207	extern void led_sysfs_enable(struct led_classdev *led_cdev);
	208
	209	/**
	210	* led_sysfs_is_disabled - check if LED sysfs interface is disabled
	211	* @led_cdev: the LED to query
	212	*
	213	* Returns: true if the led_cdev's sysfs interface is disabled.
	214	*/
	215	static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
	216	{
	217	return led_cdev->flags & LED_SYSFS_DISABLE;
	218	}
	219
c3bc9956 RP	220	/*
	221	* LED Triggers
	222	*/
39f7e08a KM	223	/* Registration functions for simple triggers */
	224	#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
	225	#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
	226
c3bc9956 RP	227	#ifdef CONFIG_LEDS_TRIGGERS
	228
	229	#define TRIG_NAME_MAX 50
	230
	231	struct led_trigger {
	232	/* Trigger Properties */
fb5035db BD	233	const char *name;
	234	void (activate)(struct led_classdev led_cdev);
	235	void (deactivate)(struct led_classdev led_cdev);
c3bc9956 RP	236
c3bc9956 RP	237	/* LEDs under control by this trigger (for simple triggers) */
fb5035db BD	238	rwlock_t leddev_list_lock;
fb5035db BD	239	struct list_head led_cdevs;
c3bc9956 RP	240
c3bc9956 RP	241	/* Link to next registered trigger */
fb5035db	242	struct list_head next_trig;
c3bc9956 RP	243	};
c3bc9956 RP	244
20f56758 JA	245	ssize_t led_trigger_store(struct device dev, struct device_attribute attr,
	246	const char *buf, size_t count);
	247	ssize_t led_trigger_show(struct device dev, struct device_attribute attr,
	248	char *buf);
	249
c3bc9956 RP	250	/* Registration functions for complex triggers */
	251	extern int led_trigger_register(struct led_trigger *trigger);
	252	extern void led_trigger_unregister(struct led_trigger *trigger);
9534cc31 HK	253	extern int devm_led_trigger_register(struct device *dev,
9534cc31 HK	254	struct led_trigger *trigger);
c3bc9956	255
c3bc9956 RP	256	extern void led_trigger_register_simple(const char *name,
	257	struct led_trigger **trigger);
	258	extern void led_trigger_unregister_simple(struct led_trigger *trigger);
	259	extern void led_trigger_event(struct led_trigger *trigger,
	260	enum led_brightness event);
0b9536c9 VK	261	extern void led_trigger_blink(struct led_trigger *trigger,
	262	unsigned long *delay_on,
	263	unsigned long *delay_off);
5bb629c5 FB	264	extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
	265	unsigned long *delay_on,
	266	unsigned long *delay_off,
	267	int invert);
20f56758 JA	268	extern void led_trigger_set_default(struct led_classdev *led_cdev);
	269	extern void led_trigger_set(struct led_classdev *led_cdev,
	270	struct led_trigger *trigger);
	271	extern void led_trigger_remove(struct led_classdev *led_cdev);
	272
	273	static inline void led_get_trigger_data(struct led_classdev led_cdev)
	274	{
	275	return led_cdev->trigger_data;
	276	}
	277
057407c7 JH	278	/**
	279	* led_trigger_rename_static - rename a trigger
	280	* @name: the new trigger name
	281	* @trig: the LED trigger to rename
	282	*
	283	* Change a LED trigger name by copying the string passed in
	284	* name into current trigger name, which MUST be large
	285	* enough for the new string.
	286	*
	287	* Note that name must NOT point to the same string used
	288	* during LED registration, as that could lead to races.
	289	*
	290	* This is meant to be used on triggers with statically
	291	* allocated name.
	292	*/
	293	extern void led_trigger_rename_static(const char *name,
	294	struct led_trigger *trig);
c3bc9956 RP	295
	296	#else
	297
39f7e08a KM	298	/* Trigger has no members */
39f7e08a KM	299	struct led_trigger {};
c3bc9956	300
39f7e08a KM	301	/* Trigger inline empty functions */
	302	static inline void led_trigger_register_simple(const char *name,
	303	struct led_trigger **trigger) {}
	304	static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
	305	static inline void led_trigger_event(struct led_trigger *trigger,
	306	enum led_brightness event) {}
8890624a MG	307	static inline void led_trigger_blink(struct led_trigger *trigger,
	308	unsigned long *delay_on,
	309	unsigned long *delay_off) {}
	310	static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
	311	unsigned long *delay_on,
	312	unsigned long *delay_off,
	313	int invert) {}
20f56758 JA	314	static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
	315	static inline void led_trigger_set(struct led_classdev *led_cdev,
	316	struct led_trigger *trigger) {}
	317	static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
	318	static inline void led_get_trigger_data(struct led_classdev led_cdev)
	319	{
	320	return NULL;
	321	}
	322
39f7e08a	323	#endif /* CONFIG_LEDS_TRIGGERS */
2bfb646c RP	324
	325	/* Trigger specific functions */
	326	#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
	327	extern void ledtrig_ide_activity(void);
	328	#else
39f7e08a	329	static inline void ledtrig_ide_activity(void) {}
2bfb646c RP	330	#endif
2bfb646c RP	331
48a1d032 KM	332	#if defined(CONFIG_LEDS_TRIGGER_CAMERA) \|\| defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
	333	extern void ledtrig_flash_ctrl(bool on);
	334	extern void ledtrig_torch_ctrl(bool on);
	335	#else
	336	static inline void ledtrig_flash_ctrl(bool on) {}
	337	static inline void ledtrig_torch_ctrl(bool on) {}
	338	#endif
	339
f46e9203 NC	340	/*
	341	* Generic LED platform data for describing LED names and default triggers.
	342	*/
	343	struct led_info {
	344	const char *name;
326bb8a5	345	const char *default_trigger;
f46e9203 NC	346	int flags;
	347	};
	348
	349	struct led_platform_data {
	350	int num_leds;
	351	struct led_info *leds;
	352	};
	353
22e03f3b RA	354	/* For the leds-gpio driver */
	355	struct gpio_led {
	356	const char *name;
326bb8a5	357	const char *default_trigger;
22e03f3b	358	unsigned gpio;
ed88bae6 TP	359	unsigned active_low : 1;
	360	unsigned retain_state_suspended : 1;
	361	unsigned default_state : 2;
	362	/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON\|OFF\|KEEP) */
5c51277a	363	struct gpio_desc *gpiod;
22e03f3b	364	};
2146325d BH	365	#define LEDS_GPIO_DEFSTATE_OFF 0
	366	#define LEDS_GPIO_DEFSTATE_ON 1
	367	#define LEDS_GPIO_DEFSTATE_KEEP 2
22e03f3b RA	368
	369	struct gpio_led_platform_data {
	370	int num_leds;
9517f925	371	const struct gpio_led *leds;
2146325d BH	372
	373	#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
	374	#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
9517f925	375	#define GPIO_LED_BLINK 2 /* Please, blink */
c673a2b4	376	int (gpio_blink_set)(struct gpio_desc desc, int state,
ca3259b3 HVR	377	unsigned long *delay_on,
ca3259b3 HVR	378	unsigned long *delay_off);
22e03f3b RA	379	};
22e03f3b RA	380
4440673a UKK	381	struct platform_device *gpio_led_register_device(
4440673a UKK	382	int id, const struct gpio_led_platform_data *pdata);
22e03f3b	383
8f88731d BW	384	enum cpu_led_event {
	385	CPU_LED_IDLE_START, /* CPU enters idle */
	386	CPU_LED_IDLE_END, /* CPU idle ends */
	387	CPU_LED_START, /* Machine starts, especially resume */
	388	CPU_LED_STOP, /* Machine stops, especially suspend */
	389	CPU_LED_HALTED, /* Machine shutdown */
	390	};
	391	#ifdef CONFIG_LEDS_TRIGGER_CPU
	392	extern void ledtrig_cpu(enum cpu_led_event evt);
	393	#else
	394	static inline void ledtrig_cpu(enum cpu_led_event evt)
	395	{
	396	return;
	397	}
	398	#endif
	399
c72a1d60	400	#endif /* __LINUX_LEDS_H_INCLUDED */