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aa7c352f98
Prior to that, the devfreq device uses the governor name when adding the itself. In order to prevent the mistake used the wrong governor name, this patch defines the governor name as a constant and then uses them instead of using the string directly. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Kukjin Kim <kgene@kernel.org> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: linux-samsung-soc@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org
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 = df->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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