Root/drivers/leds/leds.h

1/*
2 * LED Core
3 *
4 * Copyright 2005 Openedhand Ltd.
5 *
6 * Author: Richard Purdie <rpurdie@openedhand.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13#ifndef __LEDS_H_INCLUDED
14#define __LEDS_H_INCLUDED
15
16#include <linux/device.h>
17#include <linux/rwsem.h>
18#include <linux/leds.h>
19
20static inline void __led_set_brightness(struct led_classdev *led_cdev,
21                    enum led_brightness value)
22{
23    if (value > led_cdev->max_brightness)
24        value = led_cdev->max_brightness;
25    led_cdev->brightness = value;
26    if (!(led_cdev->flags & LED_SUSPENDED))
27        led_cdev->brightness_set(led_cdev, value);
28}
29
30static inline int led_get_brightness(struct led_classdev *led_cdev)
31{
32    return led_cdev->brightness;
33}
34
35void led_stop_software_blink(struct led_classdev *led_cdev);
36
37extern struct rw_semaphore leds_list_lock;
38extern struct list_head leds_list;
39
40#ifdef CONFIG_LEDS_TRIGGERS
41void led_trigger_set_default(struct led_classdev *led_cdev);
42void led_trigger_set(struct led_classdev *led_cdev,
43            struct led_trigger *trigger);
44void led_trigger_remove(struct led_classdev *led_cdev);
45
46static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
47{
48    return led_cdev->trigger_data;
49}
50
51#else
52#define led_trigger_set_default(x) do {} while (0)
53#define led_trigger_set(x, y) do {} while (0)
54#define led_trigger_remove(x) do {} while (0)
55#define led_get_trigger_data(x) (NULL)
56#endif
57
58ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
59            const char *buf, size_t count);
60ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
61            char *buf);
62
63#endif /* __LEDS_H_INCLUDED */
64

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