blob: 0201f6f51ceab72892ce6b2c167d8dceaa2a23d5 [file] [log] [blame]
* Driver model for leds and led triggers
* Copyright (C) 2005 John Lenz <>
* Copyright (C) 2005 Richard Purdie <>
* 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.
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/rwsem.h>
struct device;
* LED Core
enum led_brightness {
LED_OFF = 0,
LED_HALF = 127,
LED_FULL = 255,
struct led_classdev {
const char *name;
int brightness;
int flags;
#define LED_SUSPENDED (1 << 0)
/* Set LED brightness level */
void (*brightness_set)(struct led_classdev *led_cdev,
enum led_brightness brightness);
/* Activate hardware accelerated blink */
int (*blink_set)(struct led_classdev *led_cdev,
unsigned long *delay_on,
unsigned long *delay_off);
struct device *dev;
struct list_head node; /* LED Device list */
char *default_trigger; /* Trigger to use */
/* Protects the trigger data below */
struct rw_semaphore trigger_lock;
struct led_trigger *trigger;
struct list_head trig_list;
void *trigger_data;
extern int led_classdev_register(struct device *parent,
struct led_classdev *led_cdev);
extern void __led_classdev_unregister(struct led_classdev *led_cdev, bool sus);
static inline void led_classdev_unregister(struct led_classdev *lcd)
__led_classdev_unregister(lcd, false);
static inline void led_classdev_unregister_suspended(struct led_classdev *lcd)
__led_classdev_unregister(lcd, true);
extern void led_classdev_suspend(struct led_classdev *led_cdev);
extern void led_classdev_resume(struct led_classdev *led_cdev);
* LED 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;
/* Registration functions for complex triggers */
extern int led_trigger_register(struct led_trigger *trigger);
extern void led_trigger_unregister(struct led_trigger *trigger);
/* 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;
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);
/* Triggers aren't active - null macros */
#define led_trigger_register_simple(x, y) do {} while(0)
#define led_trigger_unregister_simple(x) do {} while(0)
#define led_trigger_event(x, y) do {} while(0)
/* Trigger specific functions */
extern void ledtrig_ide_activity(void);
#define ledtrig_ide_activity() do {} while(0)
/* For the leds-gpio driver */
struct gpio_led {
const char *name;
char *default_trigger;
unsigned gpio;
u8 active_low;
struct gpio_led_platform_data {
int num_leds;
struct gpio_led *leds;
#endif /* __LINUX_LEDS_H_INCLUDED */