Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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
15struct device;
16struct class_device;
17/*
18 * LED Core
19 */
20
21enum led_brightness {
22 LED_OFF = 0,
23 LED_HALF = 127,
24 LED_FULL = 255,
25};
26
27struct led_classdev {
28 const char *name;
29 int brightness;
30 int flags;
31
32#define LED_SUSPENDED (1 << 0)
33
34 /* Set LED brightness level */
35 void (*brightness_set)(struct led_classdev *led_cdev,
36 enum led_brightness brightness);
37
38 struct class_device *class_dev;
39 struct list_head node; /* LED Device list */
40 char *default_trigger; /* Trigger to use */
41
42#ifdef CONFIG_LEDS_TRIGGERS
43 /* Protects the trigger data below */
44 rwlock_t trigger_lock;
45
46 struct led_trigger *trigger;
47 struct list_head trig_list;
48 void *trigger_data;
49#endif
50};
51
52extern int led_classdev_register(struct device *parent,
53 struct led_classdev *led_cdev);
54extern void led_classdev_unregister(struct led_classdev *led_cdev);
55extern void led_classdev_suspend(struct led_classdev *led_cdev);
56extern void led_classdev_resume(struct led_classdev *led_cdev);
57
58/*
59 * LED Triggers
60 */
61#ifdef CONFIG_LEDS_TRIGGERS
62
63#define TRIG_NAME_MAX 50
64
65struct led_trigger {
66 /* Trigger Properties */
67 const char *name;
68 void (*activate)(struct led_classdev *led_cdev);
69 void (*deactivate)(struct led_classdev *led_cdev);
70
71 /* LEDs under control by this trigger (for simple triggers) */
72 rwlock_t leddev_list_lock;
73 struct list_head led_cdevs;
74
75 /* Link to next registered trigger */
76 struct list_head next_trig;
77};
78
79/* Registration functions for complex triggers */
80extern int led_trigger_register(struct led_trigger *trigger);
81extern void led_trigger_unregister(struct led_trigger *trigger);
82
83/* Registration functions for simple triggers */
84#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
85#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
86extern void led_trigger_register_simple(const char *name,
87 struct led_trigger **trigger);
88extern void led_trigger_unregister_simple(struct led_trigger *trigger);
89extern void led_trigger_event(struct led_trigger *trigger,
90 enum led_brightness event);
91
92#else
93
94/* Triggers aren't active - null macros */
95#define DEFINE_LED_TRIGGER(x)
96#define DEFINE_LED_TRIGGER_GLOBAL(x)
97#define led_trigger_register_simple(x, y) do {} while(0)
98#define led_trigger_unregister_simple(x) do {} while(0)
99#define led_trigger_event(x, y) do {} while(0)
100
101#endif
102
103/* Trigger specific functions */
104#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
105extern void ledtrig_ide_activity(void);
106#else
107#define ledtrig_ide_activity() do {} while(0)
108#endif
109
110#endif /* __LINUX_LEDS_H_INCLUDED */