Linux kernel mirror (for testing)
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linux
1/*
2 * Driver model for leds and led triggers
3 *
4 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
5 * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
6 *
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.
10 *
11 */
12#ifndef __LINUX_LEDS_H_INCLUDED
13#define __LINUX_LEDS_H_INCLUDED
14
15#include <linux/list.h>
16#include <linux/spinlock.h>
17
18struct device;
19/*
20 * LED Core
21 */
22
23enum led_brightness {
24 LED_OFF = 0,
25 LED_HALF = 127,
26 LED_FULL = 255,
27};
28
29struct led_classdev {
30 const char *name;
31 int brightness;
32 int flags;
33
34#define LED_SUSPENDED (1 << 0)
35
36 /* Set LED brightness level */
37 void (*brightness_set)(struct led_classdev *led_cdev,
38 enum led_brightness brightness);
39
40 struct device *dev;
41 struct list_head node; /* LED Device list */
42 char *default_trigger; /* Trigger to use */
43
44#ifdef CONFIG_LEDS_TRIGGERS
45 /* Protects the trigger data below */
46 rwlock_t trigger_lock;
47
48 struct led_trigger *trigger;
49 struct list_head trig_list;
50 void *trigger_data;
51#endif
52};
53
54extern int led_classdev_register(struct device *parent,
55 struct led_classdev *led_cdev);
56extern void led_classdev_unregister(struct led_classdev *led_cdev);
57extern void led_classdev_suspend(struct led_classdev *led_cdev);
58extern void led_classdev_resume(struct led_classdev *led_cdev);
59
60/*
61 * LED Triggers
62 */
63#ifdef CONFIG_LEDS_TRIGGERS
64
65#define TRIG_NAME_MAX 50
66
67struct led_trigger {
68 /* Trigger Properties */
69 const char *name;
70 void (*activate)(struct led_classdev *led_cdev);
71 void (*deactivate)(struct led_classdev *led_cdev);
72
73 /* LEDs under control by this trigger (for simple triggers) */
74 rwlock_t leddev_list_lock;
75 struct list_head led_cdevs;
76
77 /* Link to next registered trigger */
78 struct list_head next_trig;
79};
80
81/* Registration functions for complex triggers */
82extern int led_trigger_register(struct led_trigger *trigger);
83extern void led_trigger_unregister(struct led_trigger *trigger);
84
85/* Registration functions for simple triggers */
86#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
87#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
88extern void led_trigger_register_simple(const char *name,
89 struct led_trigger **trigger);
90extern void led_trigger_unregister_simple(struct led_trigger *trigger);
91extern void led_trigger_event(struct led_trigger *trigger,
92 enum led_brightness event);
93
94#else
95
96/* Triggers aren't active - null macros */
97#define DEFINE_LED_TRIGGER(x)
98#define DEFINE_LED_TRIGGER_GLOBAL(x)
99#define led_trigger_register_simple(x, y) do {} while(0)
100#define led_trigger_unregister_simple(x) do {} while(0)
101#define led_trigger_event(x, y) do {} while(0)
102
103#endif
104
105/* Trigger specific functions */
106#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
107extern void ledtrig_ide_activity(void);
108#else
109#define ledtrig_ide_activity() do {} while(0)
110#endif
111
112/* For the leds-gpio driver */
113struct gpio_led {
114 const char *name;
115 char *default_trigger;
116 unsigned gpio;
117 u8 active_low;
118};
119
120struct gpio_led_platform_data {
121 int num_leds;
122 struct gpio_led *leds;
123};
124
125
126#endif /* __LINUX_LEDS_H_INCLUDED */