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