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ce26c5bb MH |
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> | |
eff607fd | 13 | #include <linux/module.h> |
0b7c328f | 14 | #include "governor.h" |
ce26c5bb MH |
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 | */ | |
6530b9de MH |
23 | if (!df->max_freq) |
24 | *freq = UINT_MAX; | |
25 | else | |
26 | *freq = df->max_freq; | |
ce26c5bb MH |
27 | return 0; |
28 | } | |
29 | ||
7e6fdd4b RV |
30 | static int devfreq_performance_handler(struct devfreq *devfreq, |
31 | unsigned int event, void *data) | |
0b7c328f | 32 | { |
7e6fdd4b RV |
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; | |
0b7c328f XC |
42 | } |
43 | ||
1b5c1be2 | 44 | static struct devfreq_governor devfreq_performance = { |
aa7c352f | 45 | .name = DEVFREQ_GOV_PERFORMANCE, |
ce26c5bb | 46 | .get_target_freq = devfreq_performance_func, |
7e6fdd4b | 47 | .event_handler = devfreq_performance_handler, |
ce26c5bb | 48 | }; |
83116e66 NM |
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); | |
eff607fd | 67 | MODULE_LICENSE("GPL"); |