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/*
* LED Dim Trigger
*
* Copyright (C) 2008 Bill Gatliff <bgat <at> billgatliff.com>
*
* "Dims" an LED based on system load. Derived from Atsushi Nemoto's
* ledtrig-heartbeat.c.
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/leds.h>
#include "leds.h"
struct dim_trig_data {
struct timer_list timer;
};
static void
led_dim_function(unsigned long data)
{
struct led_classdev *led_cdev = (struct led_classdev *)data;
struct dim_trig_data *dim_data = led_cdev->trigger_data;
unsigned int brightness;
brightness = ((LED_FULL - LED_OFF) * avenrun[0]) / EXP_1;
if (brightness > LED_FULL)
brightness = LED_FULL;
led_set_brightness(led_cdev, brightness);
mod_timer(&dim_data->timer, jiffies + msecs_to_jiffies(500));
}
static void
dim_trig_activate(struct led_classdev *led_cdev)
{
struct dim_trig_data *dim_data;
dim_data = kzalloc(sizeof(*dim_data), GFP_KERNEL);
if (!dim_data)
return;
led_cdev->trigger_data = dim_data;
setup_timer(&dim_data->timer,
led_dim_function, (unsigned long)led_cdev);
led_dim_function(dim_data->timer.data);
}
static void
dim_trig_deactivate(struct led_classdev *led_cdev)
{
struct dim_trig_data *dim_data = led_cdev->trigger_data;
if (dim_data) {
del_timer_sync(&dim_data->timer);
kfree(dim_data);
}
}
static struct led_trigger dim_led_trigger = {
.name = "dim",
.activate = dim_trig_activate,
.deactivate = dim_trig_deactivate,
};
static int __init dim_trig_init(void)
{
return led_trigger_register(&dim_led_trigger);
}
module_init(dim_trig_init);
static void __exit dim_trig_exit(void)
{
led_trigger_unregister(&dim_led_trigger);
}
module_exit(dim_trig_exit);
MODULE_AUTHOR("Bill Gatliff <bgat <at> billgatliff.com>");
MODULE_DESCRIPTION("Dim LED trigger");
MODULE_LICENSE("GPL");
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