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>
16 static void dummy_leds_event(led_event_t evt)
20 void (*leds_event)(led_event_t) = dummy_leds_event;
22 struct leds_evt_name {
28 static 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 },
35 static ssize_t leds_store(struct sys_device *dev,
36 struct sysdev_attribute *attr,
37 const char *buf, size_t size)
39 int ret = -EINVAL, len = strcspn(buf, " ");
41 if (len > 0 && buf[len] == '\0')
44 if (strncmp(buf, "claim", len) == 0) {
45 leds_event(led_claim);
47 } else if (strncmp(buf, "release", len) == 0) {
48 leds_event(led_release);
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)
57 if (strncmp(buf+len, " on", 3) == 0) {
58 leds_event(evt_names[i].on);
60 } else if (strncmp(buf+len, " off", 4) == 0) {
61 leds_event(evt_names[i].off);
70 static SYSDEV_ATTR(event, 0200, NULL, leds_store);
72 static int leds_suspend(struct sys_device *dev, pm_message_t state)
78 static int leds_resume(struct sys_device *dev)
80 leds_event(led_start);
84 static int leds_shutdown(struct sys_device *dev)
86 leds_event(led_halted);
90 static struct sysdev_class leds_sysclass = {
92 .shutdown = leds_shutdown,
93 .suspend = leds_suspend,
94 .resume = leds_resume,
97 static struct sys_device leds_device = {
99 .cls = &leds_sysclass,
102 static int __init leds_init(void)
105 ret = sysdev_class_register(&leds_sysclass);
107 ret = sysdev_register(&leds_device);
109 ret = sysdev_create_file(&leds_device, &attr_event);
113 device_initcall(leds_init);
115 EXPORT_SYMBOL(leds_event);