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ce26c5bb MH |
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> | |
0b7c328f | 13 | #include "governor.h" |
ce26c5bb MH |
14 | |
15 | static 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 | */ | |
6530b9de | 22 | *freq = df->min_freq; |
ce26c5bb MH |
23 | return 0; |
24 | } | |
25 | ||
7e6fdd4b RV |
26 | static int devfreq_powersave_handler(struct devfreq *devfreq, |
27 | unsigned int event, void *data) | |
0b7c328f | 28 | { |
7e6fdd4b RV |
29 | int ret = 0; |
30 | ||
31 | if (event == DEVFREQ_GOV_START) { | |
32 | mutex_lock(&devfreq->lock); | |
33 | ret = update_devfreq(devfreq); | |
34 | mutex_unlock(&devfreq->lock); | |
35 | } | |
36 | ||
37 | return ret; | |
0b7c328f XC |
38 | } |
39 | ||
1b5c1be2 | 40 | static struct devfreq_governor devfreq_powersave = { |
ce26c5bb MH |
41 | .name = "powersave", |
42 | .get_target_freq = devfreq_powersave_func, | |
7e6fdd4b | 43 | .event_handler = devfreq_powersave_handler, |
ce26c5bb | 44 | }; |
83116e66 NM |
45 | |
46 | static int __init devfreq_powersave_init(void) | |
47 | { | |
48 | return devfreq_add_governor(&devfreq_powersave); | |
49 | } | |
50 | subsys_initcall(devfreq_powersave_init); | |
51 | ||
52 | static void __exit devfreq_powersave_exit(void) | |
53 | { | |
54 | int ret; | |
55 | ||
56 | ret = devfreq_remove_governor(&devfreq_powersave); | |
57 | if (ret) | |
58 | pr_err("%s: failed remove governor %d\n", __func__, ret); | |
59 | ||
60 | return; | |
61 | } | |
62 | module_exit(devfreq_powersave_exit); |