2 * Driver model for leds and led triggers
4 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
5 * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
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.
12 #ifndef __LINUX_LEDS_H_INCLUDED
13 #define __LINUX_LEDS_H_INCLUDED
15 #include <linux/list.h>
16 #include <linux/spinlock.h>
17 #include <linux/rwsem.h>
35 #define LED_SUSPENDED (1 << 0)
37 /* Set LED brightness level */
38 void (*brightness_set)(struct led_classdev *led_cdev,
39 enum led_brightness brightness);
41 /* Activate hardware accelerated blink */
42 int (*blink_set)(struct led_classdev *led_cdev,
43 unsigned long *delay_on,
44 unsigned long *delay_off);
47 struct list_head node; /* LED Device list */
48 char *default_trigger; /* Trigger to use */
50 #ifdef CONFIG_LEDS_TRIGGERS
51 /* Protects the trigger data below */
52 struct rw_semaphore trigger_lock;
54 struct led_trigger *trigger;
55 struct list_head trig_list;
60 extern int led_classdev_register(struct device *parent,
61 struct led_classdev *led_cdev);
62 extern void __led_classdev_unregister(struct led_classdev *led_cdev, bool sus);
63 static inline void led_classdev_unregister(struct led_classdev *lcd)
65 __led_classdev_unregister(lcd, false);
67 static inline void led_classdev_unregister_suspended(struct led_classdev *lcd)
69 __led_classdev_unregister(lcd, true);
71 extern void led_classdev_suspend(struct led_classdev *led_cdev);
72 extern void led_classdev_resume(struct led_classdev *led_cdev);
77 #ifdef CONFIG_LEDS_TRIGGERS
79 #define TRIG_NAME_MAX 50
82 /* Trigger Properties */
84 void (*activate)(struct led_classdev *led_cdev);
85 void (*deactivate)(struct led_classdev *led_cdev);
87 /* LEDs under control by this trigger (for simple triggers) */
88 rwlock_t leddev_list_lock;
89 struct list_head led_cdevs;
91 /* Link to next registered trigger */
92 struct list_head next_trig;
95 /* Registration functions for complex triggers */
96 extern int led_trigger_register(struct led_trigger *trigger);
97 extern void led_trigger_unregister(struct led_trigger *trigger);
99 /* Registration functions for simple triggers */
100 #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
101 #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
102 extern void led_trigger_register_simple(const char *name,
103 struct led_trigger **trigger);
104 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
105 extern void led_trigger_event(struct led_trigger *trigger,
106 enum led_brightness event);
110 /* Triggers aren't active - null macros */
111 #define DEFINE_LED_TRIGGER(x)
112 #define DEFINE_LED_TRIGGER_GLOBAL(x)
113 #define led_trigger_register_simple(x, y) do {} while(0)
114 #define led_trigger_unregister_simple(x) do {} while(0)
115 #define led_trigger_event(x, y) do {} while(0)
119 /* Trigger specific functions */
120 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
121 extern void ledtrig_ide_activity(void);
123 #define ledtrig_ide_activity() do {} while(0)
126 /* For the leds-gpio driver */
129 char *default_trigger;
134 struct gpio_led_platform_data {
136 struct gpio_led *leds;
140 #endif /* __LINUX_LEDS_H_INCLUDED */