Linux kernel mirror (for testing)
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tjh.dev
kernel
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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#include <linux/rwsem.h>
18
19struct 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 /* 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);
43
44 /* Activate hardware accelerated blink */
45 int (*blink_set)(struct led_classdev *led_cdev,
46 unsigned long *delay_on,
47 unsigned long *delay_off);
48
49 struct device *dev;
50 struct list_head node; /* LED Device list */
51 char *default_trigger; /* Trigger to use */
52
53#ifdef CONFIG_LEDS_TRIGGERS
54 /* Protects the trigger data below */
55 struct rw_semaphore trigger_lock;
56
57 struct led_trigger *trigger;
58 struct list_head trig_list;
59 void *trigger_data;
60#endif
61};
62
63extern int led_classdev_register(struct device *parent,
64 struct led_classdev *led_cdev);
65extern void led_classdev_unregister(struct led_classdev *lcd);
66extern void led_classdev_suspend(struct led_classdev *led_cdev);
67extern void led_classdev_resume(struct led_classdev *led_cdev);
68
69/*
70 * LED Triggers
71 */
72#ifdef CONFIG_LEDS_TRIGGERS
73
74#define TRIG_NAME_MAX 50
75
76struct led_trigger {
77 /* Trigger Properties */
78 const char *name;
79 void (*activate)(struct led_classdev *led_cdev);
80 void (*deactivate)(struct led_classdev *led_cdev);
81
82 /* LEDs under control by this trigger (for simple triggers) */
83 rwlock_t leddev_list_lock;
84 struct list_head led_cdevs;
85
86 /* Link to next registered trigger */
87 struct list_head next_trig;
88};
89
90/* Registration functions for complex triggers */
91extern int led_trigger_register(struct led_trigger *trigger);
92extern void led_trigger_unregister(struct led_trigger *trigger);
93
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;
97extern void led_trigger_register_simple(const char *name,
98 struct led_trigger **trigger);
99extern void led_trigger_unregister_simple(struct led_trigger *trigger);
100extern void led_trigger_event(struct led_trigger *trigger,
101 enum led_brightness event);
102
103#else
104
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)
111
112#endif
113
114/* Trigger specific functions */
115#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
116extern void ledtrig_ide_activity(void);
117#else
118#define ledtrig_ide_activity() do {} while(0)
119#endif
120
121/* For the leds-gpio driver */
122struct gpio_led {
123 const char *name;
124 char *default_trigger;
125 unsigned gpio;
126 u8 active_low;
127};
128
129struct gpio_led_platform_data {
130 int num_leds;
131 struct gpio_led *leds;
132 int (*gpio_blink_set)(unsigned gpio,
133 unsigned long *delay_on,
134 unsigned long *delay_off);
135};
136
137
138#endif /* __LINUX_LEDS_H_INCLUDED */