mirror of
https://github.com/torvalds/linux.git
synced 2026-01-12 00:42:35 +08:00
447c4e8338
Some device drivers (and out-of-tree modules) might want to define device-specific device governors. Rather than restricting all of them to be a part of drivers/devfreq/ (which is not possible for out-of-tree drivers anyway) move governor.h to include/linux/devfreq-governor.h and update all drivers to use it. The devfreq_cpu_data is only used internally, by the passive governor, so it is moved to the driver source rather than being a part of the public interface. Reported-by: Robie Basak <robibasa@qti.qualcomm.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Reviewed-by: Bjorn Andersson <andersson@kernel.org> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://patchwork.kernel.org/project/linux-pm/patch/20251030-governor-public-v2-1-432a11a9975a@oss.qualcomm.com/
63 lines
1.3 KiB
C
63 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/devfreq-governor.h>
|
|
#include <linux/module.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_DESCRIPTION("DEVFREQ Powersave governor");
|
|
MODULE_LICENSE("GPL");
|