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_stop_software_blink(struct led_classdev *led_cdev)
28{
29	/* deactivate previous settings */
30	del_timer_sync(&led_cdev->blink_timer);
31	led_cdev->blink_delay_on = 0;
32	led_cdev->blink_delay_off = 0;
33}
34
35static void led_set_software_blink(struct led_classdev *led_cdev,
36				   unsigned long delay_on,
37				   unsigned long delay_off)
38{
39	int current_brightness;
40
41	current_brightness = led_get_brightness(led_cdev);
42	if (current_brightness)
43		led_cdev->blink_brightness = current_brightness;
44	if (!led_cdev->blink_brightness)
45		led_cdev->blink_brightness = led_cdev->max_brightness;
46
47	led_cdev->blink_delay_on = delay_on;
48	led_cdev->blink_delay_off = delay_off;
49
50	/* never on - don't blink */
51	if (!delay_on)
52		return;
53
54	/* never off - just set to brightness */
55	if (!delay_off) {
56		led_set_brightness(led_cdev, led_cdev->blink_brightness);
57		return;
58	}
59
60	mod_timer(&led_cdev->blink_timer, jiffies + 1);
61}
62
63
64void led_blink_set(struct led_classdev *led_cdev,
65		   unsigned long *delay_on,
66		   unsigned long *delay_off)
67{
68	del_timer_sync(&led_cdev->blink_timer);
69
70	if (led_cdev->blink_set &&
71	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))
72		return;
73
74	/* blink with 1 Hz as default if nothing specified */
75	if (!*delay_on && !*delay_off)
76		*delay_on = *delay_off = 500;
77
78	led_set_software_blink(led_cdev, *delay_on, *delay_off);
79}
80EXPORT_SYMBOL(led_blink_set);
81
82void led_brightness_set(struct led_classdev *led_cdev,
83			enum led_brightness brightness)
84{
85	led_stop_software_blink(led_cdev);
86	led_cdev->brightness_set(led_cdev, brightness);
87}
88EXPORT_SYMBOL(led_brightness_set);

 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);