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/*
* LED support code, ripped out of arch/arm/kernel/time.c
*
* Copyright (C) 1994-2001 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/export.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/syscore_ops.h>
#include <linux/string.h>
#include <asm/leds.h>
static void dummy_leds_event(led_event_t evt)
{
}
void (*leds_event)(led_event_t) = dummy_leds_event;
struct leds_evt_name {
const char name[8];
int on;
int off;
};
static const struct leds_evt_name evt_names[] = {
{ "amber", led_amber_on, led_amber_off },
{ "blue", led_blue_on, led_blue_off },
{ "green", led_green_on, led_green_off },
{ "red", led_red_on, led_red_off },
};
static ssize_t leds_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
int ret = -EINVAL, len = strcspn(buf, " ");
if (len > 0 && buf[len] == '\0')
len--;
if (strncmp(buf, "claim", len) == 0) {
leds_event(led_claim);
ret = size;
} else if (strncmp(buf, "release", len) == 0) {
leds_event(led_release);
ret = size;
} else {
int i;
for (i = 0; i < ARRAY_SIZE(evt_names); i++) {
if (strlen(evt_names[i].name) != len ||
strncmp(buf, evt_names[i].name, len) != 0)
continue;
if (strncmp(buf+len, " on", 3) == 0) {
leds_event(evt_names[i].on);
ret = size;
} else if (strncmp(buf+len, " off", 4) == 0) {
leds_event(evt_names[i].off);
ret = size;
}
break;
}
}
return ret;
}
static DEVICE_ATTR(event, 0200, NULL, leds_store);
static struct bus_type leds_subsys = {
.name = "leds",
.dev_name = "leds",
};
static struct device leds_device = {
.id = 0,
.bus = &leds_subsys,
};
static int leds_suspend(void)
{
leds_event(led_stop);
return 0;
}
static void leds_resume(void)
{
leds_event(led_start);
}
static void leds_shutdown(void)
{
leds_event(led_halted);
}
static struct syscore_ops leds_syscore_ops = {
.shutdown = leds_shutdown,
.suspend = leds_suspend,
.resume = leds_resume,
};
static int leds_idle_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
switch (val) {
case IDLE_START:
leds_event(led_idle_start);
break;
case IDLE_END:
leds_event(led_idle_end);
break;
}
return 0;
}
static struct notifier_block leds_idle_nb = {
.notifier_call = leds_idle_notifier,
};
static int __init leds_init(void)
{
int ret;
ret = subsys_system_register(&leds_subsys, NULL);
if (ret == 0)
ret = device_register(&leds_device);
if (ret == 0)
ret = device_create_file(&leds_device, &dev_attr_event);
if (ret == 0) {
register_syscore_ops(&leds_syscore_ops);
idle_notifier_register(&leds_idle_nb);
}
return ret;
}
device_initcall(leds_init);
EXPORT_SYMBOL(leds_event);
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