Root/drivers/devfreq/governor_performance.c

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
16static 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
30static 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
44static struct devfreq_governor devfreq_performance = {
45    .name = "performance",
46    .get_target_freq = devfreq_performance_func,
47    .event_handler = devfreq_performance_handler,
48};
49
50static int __init devfreq_performance_init(void)
51{
52    return devfreq_add_governor(&devfreq_performance);
53}
54subsys_initcall(devfreq_performance_init);
55
56static 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}
66module_exit(devfreq_performance_exit);
67MODULE_LICENSE("GPL");
68

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