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;
19struct class_device;
20/*
21 * LED Core
22 */
23
24enum led_brightness {
25 LED_OFF = 0,
26 LED_HALF = 127,
27 LED_FULL = 255,
28};
29
30struct led_classdev {
31 const char *name;
32 int brightness;
33 int flags;
34
35#define LED_SUSPENDED (1 << 0)
36
37 /* Set LED brightness level */
38 void (*brightness_set)(struct led_classdev *led_cdev,
39 enum led_brightness brightness);
40
41 struct class_device *class_dev;
42 struct list_head node; /* LED Device list */
43 char *default_trigger; /* Trigger to use */
44
45#ifdef CONFIG_LEDS_TRIGGERS
46 /* Protects the trigger data below */
47 rwlock_t trigger_lock;
48
49 struct led_trigger *trigger;
50 struct list_head trig_list;
51 void *trigger_data;
52#endif
53};
54
55extern int led_classdev_register(struct device *parent,
56 struct led_classdev *led_cdev);
57extern void led_classdev_unregister(struct led_classdev *led_cdev);
58extern void led_classdev_suspend(struct led_classdev *led_cdev);
59extern void led_classdev_resume(struct led_classdev *led_cdev);
60
61/*
62 * LED Triggers
63 */
64#ifdef CONFIG_LEDS_TRIGGERS
65
66#define TRIG_NAME_MAX 50
67
68struct led_trigger {
69 /* Trigger Properties */
70 const char *name;
71 void (*activate)(struct led_classdev *led_cdev);
72 void (*deactivate)(struct led_classdev *led_cdev);
73
74 /* LEDs under control by this trigger (for simple triggers) */
75 rwlock_t leddev_list_lock;
76 struct list_head led_cdevs;
77
78 /* Link to next registered trigger */
79 struct list_head next_trig;
80};
81
82/* Registration functions for complex triggers */
83extern int led_trigger_register(struct led_trigger *trigger);
84extern void led_trigger_unregister(struct led_trigger *trigger);
85
86/* Registration functions for simple triggers */
87#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
88#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
89extern void led_trigger_register_simple(const char *name,
90 struct led_trigger **trigger);
91extern void led_trigger_unregister_simple(struct led_trigger *trigger);
92extern void led_trigger_event(struct led_trigger *trigger,
93 enum led_brightness event);
94
95#else
96
97/* Triggers aren't active - null macros */
98#define DEFINE_LED_TRIGGER(x)
99#define DEFINE_LED_TRIGGER_GLOBAL(x)
100#define led_trigger_register_simple(x, y) do {} while(0)
101#define led_trigger_unregister_simple(x) do {} while(0)
102#define led_trigger_event(x, y) do {} while(0)
103
104#endif
105
106/* Trigger specific functions */
107#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
108extern void ledtrig_ide_activity(void);
109#else
110#define ledtrig_ide_activity() do {} while(0)
111#endif
112
113#endif /* __LINUX_LEDS_H_INCLUDED */