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 /* Must not sleep, use a workqueue if needed */
39 void (*brightness_set)(struct led_classdev *led_cdev,
40 enum led_brightness brightness);
41 /* Get LED brightness level */
42 enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
44 /* Activate hardware accelerated blink */
45 int (*blink_set)(struct led_classdev *led_cdev,
46 unsigned long *delay_on,
47 unsigned long *delay_off);
50 struct list_head node; /* LED Device list */
51 const char *default_trigger; /* Trigger to use */
53 #ifdef CONFIG_LEDS_TRIGGERS
54 /* Protects the trigger data below */
55 struct rw_semaphore trigger_lock;
57 struct led_trigger *trigger;
58 struct list_head trig_list;
63 extern int led_classdev_register(struct device *parent,
64 struct led_classdev *led_cdev);
65 extern void led_classdev_unregister(struct led_classdev *lcd);
66 extern void led_classdev_suspend(struct led_classdev *led_cdev);
67 extern void led_classdev_resume(struct led_classdev *led_cdev);
72 #ifdef CONFIG_LEDS_TRIGGERS
74 #define TRIG_NAME_MAX 50
77 /* Trigger Properties */
79 void (*activate)(struct led_classdev *led_cdev);
80 void (*deactivate)(struct led_classdev *led_cdev);
82 /* LEDs under control by this trigger (for simple triggers) */
83 rwlock_t leddev_list_lock;
84 struct list_head led_cdevs;
86 /* Link to next registered trigger */
87 struct list_head next_trig;
90 /* Registration functions for complex triggers */
91 extern int led_trigger_register(struct led_trigger *trigger);
92 extern void led_trigger_unregister(struct led_trigger *trigger);
94 /* Registration functions for simple triggers */
95 #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
96 #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
97 extern void led_trigger_register_simple(const char *name,
98 struct led_trigger **trigger);
99 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
100 extern void led_trigger_event(struct led_trigger *trigger,
101 enum led_brightness event);
105 /* Triggers aren't active - null macros */
106 #define DEFINE_LED_TRIGGER(x)
107 #define DEFINE_LED_TRIGGER_GLOBAL(x)
108 #define led_trigger_register_simple(x, y) do {} while(0)
109 #define led_trigger_unregister_simple(x) do {} while(0)
110 #define led_trigger_event(x, y) do {} while(0)
114 /* Trigger specific functions */
115 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
116 extern void ledtrig_ide_activity(void);
118 #define ledtrig_ide_activity() do {} while(0)
122 * Generic LED platform data for describing LED names and default triggers.
126 const char *default_trigger;
130 struct led_platform_data {
132 struct led_info *leds;
135 /* For the leds-gpio driver */
138 const char *default_trigger;
143 struct gpio_led_platform_data {
145 struct gpio_led *leds;
146 int (*gpio_blink_set)(unsigned gpio,
147 unsigned long *delay_on,
148 unsigned long *delay_off);
152 #endif /* __LINUX_LEDS_H_INCLUDED */