65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
|
|
* linux/drivers/devfreq/governor_powersave.c
|
|
*
|
|
* Copyright (C) 2011 Samsung Electronics
|
|
* MyungJoo Ham <myungjoo.ham@samsung.com>
|
|
*
|
|
* 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/devfreq.h>
|
|
#include <linux/module.h>
|
|
#include "governor.h"
|
|
|
|
static int devfreq_powersave_func(struct devfreq *df,
|
|
unsigned long *freq)
|
|
{
|
|
/*
|
|
* target callback should be able to get ceiling value as
|
|
* said in devfreq.h
|
|
*/
|
|
*freq = df->min_freq;
|
|
return 0;
|
|
}
|
|
|
|
static int devfreq_powersave_handler(struct devfreq *devfreq,
|
|
unsigned int event, void *data)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (event == DEVFREQ_GOV_START) {
|
|
mutex_lock(&devfreq->lock);
|
|
ret = update_devfreq(devfreq);
|
|
mutex_unlock(&devfreq->lock);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct devfreq_governor devfreq_powersave = {
|
|
.name = DEVFREQ_GOV_POWERSAVE,
|
|
.get_target_freq = devfreq_powersave_func,
|
|
.event_handler = devfreq_powersave_handler,
|
|
};
|
|
|
|
static int __init devfreq_powersave_init(void)
|
|
{
|
|
return devfreq_add_governor(&devfreq_powersave);
|
|
}
|
|
subsys_initcall(devfreq_powersave_init);
|
|
|
|
static void __exit devfreq_powersave_exit(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = devfreq_remove_governor(&devfreq_powersave);
|
|
if (ret)
|
|
pr_err("%s: failed remove governor %d\n", __func__, ret);
|
|
|
|
return;
|
|
}
|
|
module_exit(devfreq_powersave_exit);
|
|
MODULE_LICENSE("GPL");
|