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Several governors use the user space limits df->min/max_freq to adjust the target frequency. This is not necessary, since update_devfreq() already takes care of this. Instead the governor can request the available min/max frequency by setting the target frequency to DEVFREQ_MIN/MAX_FREQ and let update_devfreq() take care of any adjustments. Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Brian Norris <briannorris@chromium.org> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* linux/drivers/devfreq/governor_powersave.c
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*
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* Copyright (C) 2011 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/devfreq.h>
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#include <linux/module.h>
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#include "governor.h"
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static int devfreq_powersave_func(struct devfreq *df,
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unsigned long *freq)
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{
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/*
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* target callback should be able to get ceiling value as
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* said in devfreq.h
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*/
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*freq = DEVFREQ_MIN_FREQ;
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return 0;
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}
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static int devfreq_powersave_handler(struct devfreq *devfreq,
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unsigned int event, void *data)
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{
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int ret = 0;
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if (event == DEVFREQ_GOV_START) {
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mutex_lock(&devfreq->lock);
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ret = update_devfreq(devfreq);
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mutex_unlock(&devfreq->lock);
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}
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return ret;
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}
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static struct devfreq_governor devfreq_powersave = {
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.name = DEVFREQ_GOV_POWERSAVE,
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.get_target_freq = devfreq_powersave_func,
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.event_handler = devfreq_powersave_handler,
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};
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static int __init devfreq_powersave_init(void)
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{
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return devfreq_add_governor(&devfreq_powersave);
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}
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subsys_initcall(devfreq_powersave_init);
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static void __exit devfreq_powersave_exit(void)
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{
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int ret;
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ret = devfreq_remove_governor(&devfreq_powersave);
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if (ret)
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pr_err("%s: failed remove governor %d\n", __func__, ret);
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return;
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}
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module_exit(devfreq_powersave_exit);
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MODULE_LICENSE("GPL");
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