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-rw-r--r--arch/arm/kernel/leds.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/arm/kernel/leds.c b/arch/arm/kernel/leds.c
new file mode 100644
index 000000000000..31a316c1777b
--- /dev/null
+++ b/arch/arm/kernel/leds.c
@@ -0,0 +1,115 @@
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 */
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/sysdev.h>
13
14#include <asm/leds.h>
15
16static void dummy_leds_event(led_event_t evt)
17{
18}
19
20void (*leds_event)(led_event_t) = dummy_leds_event;
21
22struct leds_evt_name {
23 const char name[8];
24 int on;
25 int off;
26};
27
28static const struct leds_evt_name evt_names[] = {
29 { "amber", led_amber_on, led_amber_off },
30 { "blue", led_blue_on, led_blue_off },
31 { "green", led_green_on, led_green_off },
32 { "red", led_red_on, led_red_off },
33};
34
35static ssize_t leds_store(struct sys_device *dev,
36 struct sysdev_attribute *attr,
37 const char *buf, size_t size)
38{
39 int ret = -EINVAL, len = strcspn(buf, " ");
40
41 if (len > 0 && buf[len] == '\0')
42 len--;
43
44 if (strncmp(buf, "claim", len) == 0) {
45 leds_event(led_claim);
46 ret = size;
47 } else if (strncmp(buf, "release", len) == 0) {
48 leds_event(led_release);
49 ret = size;
50 } else {
51 int i;
52
53 for (i = 0; i < ARRAY_SIZE(evt_names); i++) {
54 if (strlen(evt_names[i].name) != len ||
55 strncmp(buf, evt_names[i].name, len) != 0)
56 continue;
57 if (strncmp(buf+len, " on", 3) == 0) {
58 leds_event(evt_names[i].on);
59 ret = size;
60 } else if (strncmp(buf+len, " off", 4) == 0) {
61 leds_event(evt_names[i].off);
62 ret = size;
63 }
64 break;
65 }
66 }
67 return ret;
68}
69
70static SYSDEV_ATTR(event, 0200, NULL, leds_store);
71
72static int leds_suspend(struct sys_device *dev, pm_message_t state)
73{
74 leds_event(led_stop);
75 return 0;
76}
77
78static int leds_resume(struct sys_device *dev)
79{
80 leds_event(led_start);
81 return 0;
82}
83
84static int leds_shutdown(struct sys_device *dev)
85{
86 leds_event(led_halted);
87 return 0;
88}
89
90static struct sysdev_class leds_sysclass = {
91 .name = "leds",
92 .shutdown = leds_shutdown,
93 .suspend = leds_suspend,
94 .resume = leds_resume,
95};
96
97static struct sys_device leds_device = {
98 .id = 0,
99 .cls = &leds_sysclass,
100};
101
102static int __init leds_init(void)
103{
104 int ret;
105 ret = sysdev_class_register(&leds_sysclass);
106 if (ret == 0)
107 ret = sysdev_register(&leds_device);
108 if (ret == 0)
109 ret = sysdev_create_file(&leds_device, &attr_event);
110 return ret;
111}
112
113device_initcall(leds_init);
114
115EXPORT_SYMBOL(leds_event);