Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ce26c5bb MH |
2 | /* |
3 | * linux/drivers/devfreq/governor_powersave.c | |
4 | * | |
5 | * Copyright (C) 2011 Samsung Electronics | |
6 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
ce26c5bb MH |
7 | */ |
8 | ||
9 | #include <linux/devfreq.h> | |
eff607fd | 10 | #include <linux/module.h> |
0b7c328f | 11 | #include "governor.h" |
ce26c5bb MH |
12 | |
13 | static int devfreq_powersave_func(struct devfreq *df, | |
14 | unsigned long *freq) | |
15 | { | |
16 | /* | |
17 | * target callback should be able to get ceiling value as | |
18 | * said in devfreq.h | |
19 | */ | |
6ff66e2a | 20 | *freq = DEVFREQ_MIN_FREQ; |
ce26c5bb MH |
21 | return 0; |
22 | } | |
23 | ||
7e6fdd4b RV |
24 | static int devfreq_powersave_handler(struct devfreq *devfreq, |
25 | unsigned int event, void *data) | |
0b7c328f | 26 | { |
7e6fdd4b RV |
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; | |
0b7c328f XC |
36 | } |
37 | ||
1b5c1be2 | 38 | static struct devfreq_governor devfreq_powersave = { |
aa7c352f | 39 | .name = DEVFREQ_GOV_POWERSAVE, |
ce26c5bb | 40 | .get_target_freq = devfreq_powersave_func, |
7e6fdd4b | 41 | .event_handler = devfreq_powersave_handler, |
ce26c5bb | 42 | }; |
83116e66 NM |
43 | |
44 | static int __init devfreq_powersave_init(void) | |
45 | { | |
46 | return devfreq_add_governor(&devfreq_powersave); | |
47 | } | |
48 | subsys_initcall(devfreq_powersave_init); | |
49 | ||
50 | static void __exit devfreq_powersave_exit(void) | |
51 | { | |
52 | int ret; | |
53 | ||
54 | ret = devfreq_remove_governor(&devfreq_powersave); | |
55 | if (ret) | |
56 | pr_err("%s: failed remove governor %d\n", __func__, ret); | |
57 | ||
58 | return; | |
59 | } | |
60 | module_exit(devfreq_powersave_exit); | |
53e4e2b5 | 61 | MODULE_DESCRIPTION("DEVFREQ Powersave governor"); |
eff607fd | 62 | MODULE_LICENSE("GPL"); |