Root/drivers/leds/led-core.c

1/*
2 * LED Class Core
3 *
4 * Copyright 2005-2006 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
14#include <linux/kernel.h>
15#include <linux/list.h>
16#include <linux/module.h>
17#include <linux/rwsem.h>
18#include <linux/leds.h>
19#include "leds.h"
20
21DECLARE_RWSEM(leds_list_lock);
22EXPORT_SYMBOL_GPL(leds_list_lock);
23
24LIST_HEAD(leds_list);
25EXPORT_SYMBOL_GPL(leds_list);
26
27static void led_set_software_blink(struct led_classdev *led_cdev,
28                   unsigned long delay_on,
29                   unsigned long delay_off)
30{
31    int current_brightness;
32
33    current_brightness = led_get_brightness(led_cdev);
34    if (current_brightness)
35        led_cdev->blink_brightness = current_brightness;
36    if (!led_cdev->blink_brightness)
37        led_cdev->blink_brightness = led_cdev->max_brightness;
38
39    led_cdev->blink_delay_on = delay_on;
40    led_cdev->blink_delay_off = delay_off;
41
42    /* never on - don't blink */
43    if (!delay_on)
44        return;
45
46    /* never off - just set to brightness */
47    if (!delay_off) {
48        __led_set_brightness(led_cdev, led_cdev->blink_brightness);
49        return;
50    }
51
52    mod_timer(&led_cdev->blink_timer, jiffies + 1);
53}
54
55
56static void led_blink_setup(struct led_classdev *led_cdev,
57             unsigned long *delay_on,
58             unsigned long *delay_off)
59{
60    if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
61        led_cdev->blink_set &&
62        !led_cdev->blink_set(led_cdev, delay_on, delay_off))
63        return;
64
65    /* blink with 1 Hz as default if nothing specified */
66    if (!*delay_on && !*delay_off)
67        *delay_on = *delay_off = 500;
68
69    led_set_software_blink(led_cdev, *delay_on, *delay_off);
70}
71
72void led_blink_set(struct led_classdev *led_cdev,
73           unsigned long *delay_on,
74           unsigned long *delay_off)
75{
76    del_timer_sync(&led_cdev->blink_timer);
77
78    led_cdev->flags &= ~LED_BLINK_ONESHOT;
79    led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
80
81    led_blink_setup(led_cdev, delay_on, delay_off);
82}
83EXPORT_SYMBOL(led_blink_set);
84
85void led_blink_set_oneshot(struct led_classdev *led_cdev,
86               unsigned long *delay_on,
87               unsigned long *delay_off,
88               int invert)
89{
90    if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
91         timer_pending(&led_cdev->blink_timer))
92        return;
93
94    led_cdev->flags |= LED_BLINK_ONESHOT;
95    led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
96
97    if (invert)
98        led_cdev->flags |= LED_BLINK_INVERT;
99    else
100        led_cdev->flags &= ~LED_BLINK_INVERT;
101
102    led_blink_setup(led_cdev, delay_on, delay_off);
103}
104EXPORT_SYMBOL(led_blink_set_oneshot);
105
106void led_set_brightness(struct led_classdev *led_cdev,
107            enum led_brightness brightness)
108{
109    /* stop and clear soft-blink timer */
110    del_timer_sync(&led_cdev->blink_timer);
111    led_cdev->blink_delay_on = 0;
112    led_cdev->blink_delay_off = 0;
113
114    __led_set_brightness(led_cdev, brightness);
115}
116EXPORT_SYMBOL(led_set_brightness);
117

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