projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| eff607fd | 13 | #include <linux/module.h> |
| 0b7c328f | 14 | #include "governor.h" |
| ce26c5bb MH |
15 | |
| 16 | static int devfreq_powersave_func(struct devfreq *df, | |
| 17 | unsigned long *freq) | |
| 18 | { | |
| 19 | /* | |
| 20 | * target callback should be able to get ceiling value as | |
| 21 | * said in devfreq.h | |
| 22 | */ | |
| 6530b9de | 23 | *freq = df->min_freq; |
| ce26c5bb MH |
24 | return 0; |
| 25 | } | |
| 26 | ||
| 7e6fdd4b RV |
27 | static int devfreq_powersave_handler(struct devfreq *devfreq, |
| 28 | unsigned int event, void *data) | |
| 0b7c328f | 29 | { |
| 7e6fdd4b RV |
30 | int ret = 0; |
| 31 | ||
| 32 | if (event == DEVFREQ_GOV_START) { | |
| 33 | mutex_lock(&devfreq->lock); | |
| 34 | ret = update_devfreq(devfreq); | |
| 35 | mutex_unlock(&devfreq->lock); | |
| 36 | } | |
| 37 | ||
| 38 | return ret; | |
| 0b7c328f XC |
39 | } |
| 40 | ||
| 1b5c1be2 | 41 | static struct devfreq_governor devfreq_powersave = { |
| ce26c5bb MH |
42 | .name = "powersave", |
| 43 | .get_target_freq = devfreq_powersave_func, | |
| 7e6fdd4b | 44 | .event_handler = devfreq_powersave_handler, |
| ce26c5bb | 45 | }; |
| 83116e66 NM |
46 | |
| 47 | static int __init devfreq_powersave_init(void) | |
| 48 | { | |
| 49 | return devfreq_add_governor(&devfreq_powersave); | |
| 50 | } | |
| 51 | subsys_initcall(devfreq_powersave_init); | |
| 52 | ||
| 53 | static void __exit devfreq_powersave_exit(void) | |
| 54 | { | |
| 55 | int ret; | |
| 56 | ||
| 57 | ret = devfreq_remove_governor(&devfreq_powersave); | |
| 58 | if (ret) | |
| 59 | pr_err("%s: failed remove governor %d\n", __func__, ret); | |
| 60 | ||
| 61 | return; | |
| 62 | } | |
| 63 | module_exit(devfreq_powersave_exit); | |
| eff607fd | 64 | MODULE_LICENSE("GPL"); |