1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 *  linux/drivers/devfreq/governor_powersave.c
 4 *
 5 *  Copyright (C) 2011 Samsung Electronics
 6 *	MyungJoo Ham <myungjoo.ham@samsung.com>
 
 
 
 
 7 */
 8
 9#include <linux/devfreq.h>
10#include <linux/module.h>
11#include "governor.h"
12
13static int devfreq_powersave_func(struct devfreq *df,
14				  unsigned long *freq)
15{
16	/*
17	 * target callback should be able to get ceiling value as
18	 * said in devfreq.h
19	 */
20	*freq = DEVFREQ_MIN_FREQ;
21	return 0;
22}
23
24static int devfreq_powersave_handler(struct devfreq *devfreq,
25				unsigned int event, void *data)
26{
27	int ret = 0;
28
29	if (event == DEVFREQ_GOV_START) {
30		mutex_lock(&devfreq->lock);
31		ret = update_devfreq(devfreq);
32		mutex_unlock(&devfreq->lock);
33	}
34
35	return ret;
36}
37
38static struct devfreq_governor devfreq_powersave = {
39	.name = DEVFREQ_GOV_POWERSAVE,
 
40	.get_target_freq = devfreq_powersave_func,
41	.event_handler = devfreq_powersave_handler,
42};
43
44static int __init devfreq_powersave_init(void)
45{
46	return devfreq_add_governor(&devfreq_powersave);
47}
48subsys_initcall(devfreq_powersave_init);
49
50static void __exit devfreq_powersave_exit(void)
51{
52	int ret;
53
54	ret = devfreq_remove_governor(&devfreq_powersave);
55	if (ret)
56		pr_err("%s: failed remove governor %d\n", __func__, ret);
57
58	return;
59}
60module_exit(devfreq_powersave_exit);
61MODULE_LICENSE("GPL");

 
 1/*
 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>
 
13#include "governor.h"
14
15static int devfreq_powersave_func(struct devfreq *df,
16				  unsigned long *freq)
17{
18	/*
19	 * target callback should be able to get ceiling value as
20	 * said in devfreq.h
21	 */
22	*freq = df->min_freq;
23	return 0;
24}
25
26static int powersave_init(struct devfreq *devfreq)
 
27{
28	return update_devfreq(devfreq);
 
 
 
 
 
 
 
 
29}
30
31const struct devfreq_governor devfreq_powersave = {
32	.name = "powersave",
33	.init = powersave_init,
34	.get_target_freq = devfreq_powersave_func,
35	.no_central_polling = true,
36};