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);
40 /* Get LED brightness level */
41 enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
43 /* Activate hardware accelerated blink */
44 int (*blink_set)(struct led_classdev *led_cdev,
45 unsigned long *delay_on,
46 unsigned long *delay_off);
49 struct list_head node; /* LED Device list */
50 char *default_trigger; /* Trigger to use */
52 #ifdef CONFIG_LEDS_TRIGGERS
53 /* Protects the trigger data below */
54 struct rw_semaphore trigger_lock;
56 struct led_trigger *trigger;
57 struct list_head trig_list;
62 extern int led_classdev_register(struct device *parent,
63 struct led_classdev *led_cdev);
64 extern void led_classdev_unregister(struct led_classdev *lcd);
65 extern void led_classdev_suspend(struct led_classdev *led_cdev);
66 extern void led_classdev_resume(struct led_classdev *led_cdev);
71 #ifdef CONFIG_LEDS_TRIGGERS
73 #define TRIG_NAME_MAX 50
76 /* Trigger Properties */
78 void (*activate)(struct led_classdev *led_cdev);
79 void (*deactivate)(struct led_classdev *led_cdev);
81 /* LEDs under control by this trigger (for simple triggers) */
82 rwlock_t leddev_list_lock;
83 struct list_head led_cdevs;
85 /* Link to next registered trigger */
86 struct list_head next_trig;
89 /* Registration functions for complex triggers */
90 extern int led_trigger_register(struct led_trigger *trigger);
91 extern void led_trigger_unregister(struct led_trigger *trigger);
93 /* Registration functions for simple triggers */
94 #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
95 #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
96 extern void led_trigger_register_simple(const char *name,
97 struct led_trigger **trigger);
98 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
99 extern void led_trigger_event(struct led_trigger *trigger,
100 enum led_brightness event);
104 /* Triggers aren't active - null macros */
105 #define DEFINE_LED_TRIGGER(x)
106 #define DEFINE_LED_TRIGGER_GLOBAL(x)
107 #define led_trigger_register_simple(x, y) do {} while(0)
108 #define led_trigger_unregister_simple(x) do {} while(0)
109 #define led_trigger_event(x, y) do {} while(0)
113 /* Trigger specific functions */
114 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
115 extern void ledtrig_ide_activity(void);
117 #define ledtrig_ide_activity() do {} while(0)
120 /* For the leds-gpio driver */
123 char *default_trigger;
128 struct gpio_led_platform_data {
130 struct gpio_led *leds;
131 int (*gpio_blink_set)(unsigned gpio,
132 unsigned long *delay_on,
133 unsigned long *delay_off);
137 #endif /* __LINUX_LEDS_H_INCLUDED */