2 * LED support code, ripped out of arch/arm/kernel/time.c
4 * Copyright (C) 1994-2001 Russell King
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.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/sysdev.h>
13 #include <linux/syscore_ops.h>
17 static void dummy_leds_event(led_event_t evt)
21 void (*leds_event)(led_event_t) = dummy_leds_event;
23 struct leds_evt_name {
29 static const struct leds_evt_name evt_names[] = {
30 { "amber", led_amber_on, led_amber_off },
31 { "blue", led_blue_on, led_blue_off },
32 { "green", led_green_on, led_green_off },
33 { "red", led_red_on, led_red_off },
36 static ssize_t leds_store(struct sys_device *dev,
37 struct sysdev_attribute *attr,
38 const char *buf, size_t size)
40 int ret = -EINVAL, len = strcspn(buf, " ");
42 if (len > 0 && buf[len] == '\0')
45 if (strncmp(buf, "claim", len) == 0) {
46 leds_event(led_claim);
48 } else if (strncmp(buf, "release", len) == 0) {
49 leds_event(led_release);
54 for (i = 0; i < ARRAY_SIZE(evt_names); i++) {
55 if (strlen(evt_names[i].name) != len ||
56 strncmp(buf, evt_names[i].name, len) != 0)
58 if (strncmp(buf+len, " on", 3) == 0) {
59 leds_event(evt_names[i].on);
61 } else if (strncmp(buf+len, " off", 4) == 0) {
62 leds_event(evt_names[i].off);
71 static SYSDEV_ATTR(event, 0200, NULL, leds_store);
73 static struct sysdev_class leds_sysclass = {
77 static struct sys_device leds_device = {
79 .cls = &leds_sysclass,
82 static int leds_suspend(void)
88 static void leds_resume(void)
90 leds_event(led_start);
93 static void leds_shutdown(void)
95 leds_event(led_halted);
98 static struct syscore_ops leds_syscore_ops = {
99 .shutdown = leds_shutdown,
100 .suspend = leds_suspend,
101 .resume = leds_resume,
104 static int __init leds_init(void)
107 ret = sysdev_class_register(&leds_sysclass);
109 ret = sysdev_register(&leds_device);
111 ret = sysdev_create_file(&leds_device, &attr_event);
113 register_syscore_ops(&leds_syscore_ops);
117 device_initcall(leds_init);
119 EXPORT_SYMBOL(leds_event);