mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/drivers/devfreq/governor_powersave.c
|
|
*
|
|
* Copyright (C) 2011 Samsung Electronics
|
|
* MyungJoo Ham <myungjoo.ham@samsung.com>
|
|
*/
|
|
|
|
#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");
|