1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  linux/drivers/devfreq/governor_performance.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_performance_func(struct devfreq *df,
14				    unsigned long *freq)
15{
16	/*
17	 * target callback should be able to get floor value as
18	 * said in devfreq.h
19	 */
20	*freq = DEVFREQ_MAX_FREQ;
21	return 0;
22}
23
24static int devfreq_performance_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_performance = {
39	.name = DEVFREQ_GOV_PERFORMANCE,
40	.get_target_freq = devfreq_performance_func,
41	.event_handler = devfreq_performance_handler,
42};
43
44static int __init devfreq_performance_init(void)
45{
46	return devfreq_add_governor(&devfreq_performance);
47}
48subsys_initcall(devfreq_performance_init);
49
50static void __exit devfreq_performance_exit(void)
51{
52	int ret;
53
54	ret = devfreq_remove_governor(&devfreq_performance);
55	if (ret)
56		pr_err("%s: failed remove governor %d\n", __func__, ret);
57
58	return;
59}
60module_exit(devfreq_performance_exit);
61MODULE_LICENSE("GPL");
62