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373b32ab RK |
1 | /* |
2 | * LED support code, ripped out of arch/arm/kernel/time.c | |
3 | * | |
4 | * Copyright (C) 1994-2001 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
ecea4ab6 | 10 | #include <linux/export.h> |
373b32ab RK |
11 | #include <linux/init.h> |
12 | #include <linux/sysdev.h> | |
328f5cc3 | 13 | #include <linux/syscore_ops.h> |
d44b28c4 | 14 | #include <linux/string.h> |
373b32ab RK |
15 | |
16 | #include <asm/leds.h> | |
17 | ||
18 | static void dummy_leds_event(led_event_t evt) | |
19 | { | |
20 | } | |
21 | ||
22 | void (*leds_event)(led_event_t) = dummy_leds_event; | |
23 | ||
24 | struct leds_evt_name { | |
25 | const char name[8]; | |
26 | int on; | |
27 | int off; | |
28 | }; | |
29 | ||
30 | static const struct leds_evt_name evt_names[] = { | |
31 | { "amber", led_amber_on, led_amber_off }, | |
32 | { "blue", led_blue_on, led_blue_off }, | |
33 | { "green", led_green_on, led_green_off }, | |
34 | { "red", led_red_on, led_red_off }, | |
35 | }; | |
36 | ||
37 | static ssize_t leds_store(struct sys_device *dev, | |
38 | struct sysdev_attribute *attr, | |
39 | const char *buf, size_t size) | |
40 | { | |
41 | int ret = -EINVAL, len = strcspn(buf, " "); | |
42 | ||
43 | if (len > 0 && buf[len] == '\0') | |
44 | len--; | |
45 | ||
46 | if (strncmp(buf, "claim", len) == 0) { | |
47 | leds_event(led_claim); | |
48 | ret = size; | |
49 | } else if (strncmp(buf, "release", len) == 0) { | |
50 | leds_event(led_release); | |
51 | ret = size; | |
52 | } else { | |
53 | int i; | |
54 | ||
55 | for (i = 0; i < ARRAY_SIZE(evt_names); i++) { | |
56 | if (strlen(evt_names[i].name) != len || | |
57 | strncmp(buf, evt_names[i].name, len) != 0) | |
58 | continue; | |
59 | if (strncmp(buf+len, " on", 3) == 0) { | |
60 | leds_event(evt_names[i].on); | |
61 | ret = size; | |
62 | } else if (strncmp(buf+len, " off", 4) == 0) { | |
63 | leds_event(evt_names[i].off); | |
64 | ret = size; | |
65 | } | |
66 | break; | |
67 | } | |
68 | } | |
69 | return ret; | |
70 | } | |
71 | ||
72 | static SYSDEV_ATTR(event, 0200, NULL, leds_store); | |
73 | ||
328f5cc3 RW |
74 | static struct sysdev_class leds_sysclass = { |
75 | .name = "leds", | |
76 | }; | |
77 | ||
78 | static struct sys_device leds_device = { | |
79 | .id = 0, | |
80 | .cls = &leds_sysclass, | |
81 | }; | |
82 | ||
83 | static int leds_suspend(void) | |
373b32ab RK |
84 | { |
85 | leds_event(led_stop); | |
86 | return 0; | |
87 | } | |
88 | ||
328f5cc3 | 89 | static void leds_resume(void) |
373b32ab RK |
90 | { |
91 | leds_event(led_start); | |
373b32ab RK |
92 | } |
93 | ||
328f5cc3 | 94 | static void leds_shutdown(void) |
373b32ab RK |
95 | { |
96 | leds_event(led_halted); | |
373b32ab RK |
97 | } |
98 | ||
328f5cc3 | 99 | static struct syscore_ops leds_syscore_ops = { |
373b32ab RK |
100 | .shutdown = leds_shutdown, |
101 | .suspend = leds_suspend, | |
102 | .resume = leds_resume, | |
103 | }; | |
104 | ||
373b32ab RK |
105 | static int __init leds_init(void) |
106 | { | |
107 | int ret; | |
108 | ret = sysdev_class_register(&leds_sysclass); | |
109 | if (ret == 0) | |
110 | ret = sysdev_register(&leds_device); | |
111 | if (ret == 0) | |
112 | ret = sysdev_create_file(&leds_device, &attr_event); | |
328f5cc3 RW |
113 | if (ret == 0) |
114 | register_syscore_ops(&leds_syscore_ops); | |
373b32ab RK |
115 | return ret; |
116 | } | |
117 | ||
118 | device_initcall(leds_init); | |
119 | ||
120 | EXPORT_SYMBOL(leds_event); |