1 /*
2  *  linux/drivers/devfreq/governor_performance.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 <linux/module.h>
14 #include "governor.h"
15 
16 static int devfreq_performance_func(struct devfreq *df,
17 				    unsigned long *freq)
18 {
19 	/*
20 	 * target callback should be able to get floor value as
21 	 * said in devfreq.h
22 	 */
23 	if (!df->max_freq)
24 		*freq = UINT_MAX;
25 	else
26 		*freq = df->max_freq;
27 	return 0;
28 }
29 
30 static int devfreq_performance_handler(struct devfreq *devfreq,
31 				unsigned int event, void *data)
32 {
33 	int ret = 0;
34 
35 	if (event == DEVFREQ_GOV_START) {
36 		mutex_lock(&devfreq->lock);
37 		ret = update_devfreq(devfreq);
38 		mutex_unlock(&devfreq->lock);
39 	}
40 
41 	return ret;
42 }
43 
44 static struct devfreq_governor devfreq_performance = {
45 	.name = "performance",
46 	.get_target_freq = devfreq_performance_func,
47 	.event_handler = devfreq_performance_handler,
48 };
49 
50 static int __init devfreq_performance_init(void)
51 {
52 	return devfreq_add_governor(&devfreq_performance);
53 }
54 subsys_initcall(devfreq_performance_init);
55 
56 static void __exit devfreq_performance_exit(void)
57 {
58 	int ret;
59 
60 	ret = devfreq_remove_governor(&devfreq_performance);
61 	if (ret)
62 		pr_err("%s: failed remove governor %d\n", __func__, ret);
63 
64 	return;
65 }
66 module_exit(devfreq_performance_exit);
67 MODULE_LICENSE("GPL");
68