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MyungJoo Hamce26c5b2011-10-02 00:19:34 +02001/*
2 * linux/drivers/devfreq/governor_powersave.c
3 *
4 * Copyright (C) 2011 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/devfreq.h>
Nishanth Menoneff607f2012-10-29 15:01:46 -050013#include <linux/module.h>
Xiaoguang Chen0b7c3282012-04-29 22:51:31 +020014#include "governor.h"
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020015
16static int devfreq_powersave_func(struct devfreq *df,
17 unsigned long *freq)
18{
19 /*
20 * target callback should be able to get ceiling value as
21 * said in devfreq.h
22 */
MyungJoo Ham6530b9de2011-12-09 16:42:19 +090023 *freq = df->min_freq;
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020024 return 0;
25}
26
Rajagopal Venkat7e6fdd42012-10-26 01:50:09 +020027static int devfreq_powersave_handler(struct devfreq *devfreq,
28 unsigned int event, void *data)
Xiaoguang Chen0b7c3282012-04-29 22:51:31 +020029{
Rajagopal Venkat7e6fdd42012-10-26 01:50:09 +020030 int ret = 0;
31
32 if (event == DEVFREQ_GOV_START) {
33 mutex_lock(&devfreq->lock);
34 ret = update_devfreq(devfreq);
35 mutex_unlock(&devfreq->lock);
36 }
37
38 return ret;
Xiaoguang Chen0b7c3282012-04-29 22:51:31 +020039}
40
Nishanth Menon1b5c1be2012-10-29 15:01:45 -050041static struct devfreq_governor devfreq_powersave = {
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020042 .name = "powersave",
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020043 .get_target_freq = devfreq_powersave_func,
Rajagopal Venkat7e6fdd42012-10-26 01:50:09 +020044 .event_handler = devfreq_powersave_handler,
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020045};
Nishanth Menon83116e62012-10-29 15:01:44 -050046
47static int __init devfreq_powersave_init(void)
48{
49 return devfreq_add_governor(&devfreq_powersave);
50}
51subsys_initcall(devfreq_powersave_init);
52
53static void __exit devfreq_powersave_exit(void)
54{
55 int ret;
56
57 ret = devfreq_remove_governor(&devfreq_powersave);
58 if (ret)
59 pr_err("%s: failed remove governor %d\n", __func__, ret);
60
61 return;
62}
63module_exit(devfreq_powersave_exit);
Nishanth Menoneff607f2012-10-29 15:01:46 -050064MODULE_LICENSE("GPL");