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>
36 /* Lower 16 bits reflect status */
37 #define LED_SUSPENDED (1 << 0)
38 /* Upper 16 bits reflect control information */
39 #define LED_CORE_SUSPENDRESUME (1 << 16)
41 /* Set LED brightness level */
42 /* Must not sleep, use a workqueue if needed */
43 void (*brightness_set)(struct led_classdev *led_cdev,
44 enum led_brightness brightness);
45 /* Get LED brightness level */
46 enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
48 /* Activate hardware accelerated blink */
49 int (*blink_set)(struct led_classdev *led_cdev,
50 unsigned long *delay_on,
51 unsigned long *delay_off);
54 struct list_head node; /* LED Device list */
55 const char *default_trigger; /* Trigger to use */
57 #ifdef CONFIG_LEDS_TRIGGERS
58 /* Protects the trigger data below */
59 struct rw_semaphore trigger_lock;
61 struct led_trigger *trigger;
62 struct list_head trig_list;
67 extern int led_classdev_register(struct device *parent,
68 struct led_classdev *led_cdev);
69 extern void led_classdev_unregister(struct led_classdev *led_cdev);
70 extern void led_classdev_suspend(struct led_classdev *led_cdev);
71 extern void led_classdev_resume(struct led_classdev *led_cdev);
76 #ifdef CONFIG_LEDS_TRIGGERS
78 #define TRIG_NAME_MAX 50
81 /* Trigger Properties */
83 void (*activate)(struct led_classdev *led_cdev);
84 void (*deactivate)(struct led_classdev *led_cdev);
86 /* LEDs under control by this trigger (for simple triggers) */
87 rwlock_t leddev_list_lock;
88 struct list_head led_cdevs;
90 /* Link to next registered trigger */
91 struct list_head next_trig;
94 /* Registration functions for complex triggers */
95 extern int led_trigger_register(struct led_trigger *trigger);
96 extern void led_trigger_unregister(struct led_trigger *trigger);
98 /* Registration functions for simple triggers */
99 #define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
100 #define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
101 extern void led_trigger_register_simple(const char *name,
102 struct led_trigger **trigger);
103 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
104 extern void led_trigger_event(struct led_trigger *trigger,
105 enum led_brightness event);
109 /* Triggers aren't active - null macros */
110 #define DEFINE_LED_TRIGGER(x)
111 #define DEFINE_LED_TRIGGER_GLOBAL(x)
112 #define led_trigger_register_simple(x, y) do {} while(0)
113 #define led_trigger_unregister_simple(x) do {} while(0)
114 #define led_trigger_event(x, y) do {} while(0)
118 /* Trigger specific functions */
119 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
120 extern void ledtrig_ide_activity(void);
122 #define ledtrig_ide_activity() do {} while(0)
126 * Generic LED platform data for describing LED names and default triggers.
130 const char *default_trigger;
134 struct led_platform_data {
136 struct led_info *leds;
139 /* For the leds-gpio driver */
142 const char *default_trigger;
145 u8 retain_state_suspended : 1;
148 struct gpio_led_platform_data {
150 struct gpio_led *leds;
151 int (*gpio_blink_set)(unsigned gpio,
152 unsigned long *delay_on,
153 unsigned long *delay_off);
157 #endif /* __LINUX_LEDS_H_INCLUDED */