Release 4.7 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_SW		(1 << 17)

#define LED_BLINK_ONESHOT	(1 << 18)

#define LED_BLINK_ONESHOT_STOP	(1 << 19)

#define LED_BLINK_INVERT	(1 << 20)

#define LED_BLINK_BRIGHTNESS_CHANGE (1 << 21)

#define LED_BLINK_DISABLE	(1 << 22)

#define LED_SYSFS_DISABLE	(1 << 23)

#define LED_DEV_CAP_FLASH	(1 << 24)

#define LED_HW_PLUGGABLE	(1 << 25)

#define LED_PANIC_INDICATOR	(1 << 26)

	/* 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 LED_OFF
         * 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;
}

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/*
 * 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;
}

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

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#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) {}
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#endif

#ifdef CONFIG_LEDS_TRIGGER_MTD
extern void ledtrig_mtd_activity(void);
#else


static inline void ledtrig_mtd_activity(void) {}
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#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) {}
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static inline void ledtrig_torch_ctrl(bool on) {}
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#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	panic_indicator : 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;
}
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#endif

#endif		/* __LINUX_LEDS_H_INCLUDED */
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