Commit | Line | Data |
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c72a1d60 RP |
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> | |
72f8da32 | 17 | #include <linux/rwsem.h> |
c72a1d60 RP |
18 | #include <linux/leds.h> |
19 | #include "leds.h" | |
20 | ||
72f8da32 | 21 | DECLARE_RWSEM(leds_list_lock); |
4d404fd5 | 22 | EXPORT_SYMBOL_GPL(leds_list_lock); |
c72a1d60 | 23 | |
4d404fd5 | 24 | LIST_HEAD(leds_list); |
c72a1d60 | 25 | EXPORT_SYMBOL_GPL(leds_list); |
a403d930 | 26 | |
a403d930 BW |
27 | static 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 | ||
a403d930 BW |
39 | led_cdev->blink_delay_on = delay_on; |
40 | led_cdev->blink_delay_off = delay_off; | |
41 | ||
8d82fef8 SS |
42 | /* never on - just set to off */ |
43 | if (!delay_on) { | |
44 | __led_set_brightness(led_cdev, LED_OFF); | |
a403d930 | 45 | return; |
8d82fef8 | 46 | } |
a403d930 BW |
47 | |
48 | /* never off - just set to brightness */ | |
49 | if (!delay_off) { | |
0da3e65b | 50 | __led_set_brightness(led_cdev, led_cdev->blink_brightness); |
a403d930 BW |
51 | return; |
52 | } | |
53 | ||
54 | mod_timer(&led_cdev->blink_timer, jiffies + 1); | |
55 | } | |
56 | ||
57 | ||
20c0e6b8 | 58 | static void led_blink_setup(struct led_classdev *led_cdev, |
5bb629c5 FB |
59 | unsigned long *delay_on, |
60 | unsigned long *delay_off) | |
a403d930 | 61 | { |
5bb629c5 FB |
62 | if (!(led_cdev->flags & LED_BLINK_ONESHOT) && |
63 | led_cdev->blink_set && | |
a403d930 BW |
64 | !led_cdev->blink_set(led_cdev, delay_on, delay_off)) |
65 | return; | |
66 | ||
67 | /* blink with 1 Hz as default if nothing specified */ | |
68 | if (!*delay_on && !*delay_off) | |
69 | *delay_on = *delay_off = 500; | |
70 | ||
71 | led_set_software_blink(led_cdev, *delay_on, *delay_off); | |
72 | } | |
5bb629c5 FB |
73 | |
74 | void led_blink_set(struct led_classdev *led_cdev, | |
75 | unsigned long *delay_on, | |
76 | unsigned long *delay_off) | |
77 | { | |
78 | del_timer_sync(&led_cdev->blink_timer); | |
79 | ||
80 | led_cdev->flags &= ~LED_BLINK_ONESHOT; | |
81 | led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; | |
82 | ||
83 | led_blink_setup(led_cdev, delay_on, delay_off); | |
84 | } | |
a403d930 BW |
85 | EXPORT_SYMBOL(led_blink_set); |
86 | ||
5bb629c5 FB |
87 | void led_blink_set_oneshot(struct led_classdev *led_cdev, |
88 | unsigned long *delay_on, | |
89 | unsigned long *delay_off, | |
90 | int invert) | |
91 | { | |
92 | if ((led_cdev->flags & LED_BLINK_ONESHOT) && | |
93 | timer_pending(&led_cdev->blink_timer)) | |
94 | return; | |
95 | ||
96 | led_cdev->flags |= LED_BLINK_ONESHOT; | |
97 | led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; | |
98 | ||
99 | if (invert) | |
100 | led_cdev->flags |= LED_BLINK_INVERT; | |
101 | else | |
102 | led_cdev->flags &= ~LED_BLINK_INVERT; | |
103 | ||
104 | led_blink_setup(led_cdev, delay_on, delay_off); | |
105 | } | |
106 | EXPORT_SYMBOL(led_blink_set_oneshot); | |
107 | ||
d23a22a7 | 108 | void led_stop_software_blink(struct led_classdev *led_cdev) |
a403d930 | 109 | { |
43786482 FB |
110 | del_timer_sync(&led_cdev->blink_timer); |
111 | led_cdev->blink_delay_on = 0; | |
112 | led_cdev->blink_delay_off = 0; | |
d23a22a7 FB |
113 | } |
114 | EXPORT_SYMBOL_GPL(led_stop_software_blink); | |
115 | ||
116 | void led_set_brightness(struct led_classdev *led_cdev, | |
117 | enum led_brightness brightness) | |
118 | { | |
119 | /* delay brightness setting if need to stop soft-blink timer */ | |
120 | if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) { | |
121 | led_cdev->delayed_set_value = brightness; | |
122 | schedule_work(&led_cdev->set_brightness_work); | |
123 | return; | |
124 | } | |
43786482 | 125 | |
0da3e65b | 126 | __led_set_brightness(led_cdev, brightness); |
a403d930 | 127 | } |
19cd67e2 | 128 | EXPORT_SYMBOL(led_set_brightness); |