/* * linux/drivers/devfreq/governor_powersave.c * * Copyright (C) 2011 Samsung Electronics * MyungJoo Ham <myungjoo.ham@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/devfreq.h> #include <linux/module.h> #include "governor.h" static int devfreq_powersave_func(struct devfreq *df, unsigned long *freq) { /* * target callback should be able to get ceiling value as * said in devfreq.h */ *freq = DEVFREQ_MIN_FREQ; return 0; } static int devfreq_powersave_handler(struct devfreq *devfreq, unsigned int event, void *data) { int ret = 0; if (event == DEVFREQ_GOV_START) { mutex_lock(&devfreq->lock); ret = update_devfreq(devfreq); mutex_unlock(&devfreq->lock); } return ret; } static struct devfreq_governor devfreq_powersave = { .name = DEVFREQ_GOV_POWERSAVE, .get_target_freq = devfreq_powersave_func, .event_handler = devfreq_powersave_handler, }; static int __init devfreq_powersave_init(void) { return devfreq_add_governor(&devfreq_powersave); } subsys_initcall(devfreq_powersave_init); static void __exit devfreq_powersave_exit(void) { int ret; ret = devfreq_remove_governor(&devfreq_powersave); if (ret) pr_err("%s: failed remove governor %d\n", __func__, ret); return; } module_exit(devfreq_powersave_exit); MODULE_LICENSE("GPL");