2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-19 10:44:14 +08:00
linux-next/include/linux/devfreq_cooling.h
Javi Merino 3aa5374376 devfreq_cooling: pass a pointer to devfreq in the power model callbacks
When the devfreq cooling device was designed, it was an oversight not to
pass a pointer to the struct devfreq as the first parameters of the
callbacks.  The design patterns of the kernel suggest it for a good
reason.

By passing a pointer to struct devfreq, the driver can register one
function that works with multiple devices.  With the current
implementation, a driver that can work with multiple devices has to
create multiple copies of the same function with different parameters so
that each devfreq_cooling_device can use the appropriate one.  By
passing a pointer to struct devfreq, the driver can identify which
device it's referring to.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Reviewed-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Ørjan Eide <orjan.eide@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
2016-11-23 10:07:35 +08:00

85 lines
2.6 KiB
C

/*
* devfreq_cooling: Thermal cooling device implementation for devices using
* devfreq
*
* Copyright (C) 2014-2015 ARM Limited
*
* 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 distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __DEVFREQ_COOLING_H__
#define __DEVFREQ_COOLING_H__
#include <linux/devfreq.h>
#include <linux/thermal.h>
/**
* struct devfreq_cooling_power - Devfreq cooling power ops
* @get_static_power: Take voltage, in mV, and return the static power
* in mW. If NULL, the static power is assumed
* to be 0.
* @get_dynamic_power: Take voltage, in mV, and frequency, in HZ, and
* return the dynamic power draw in mW. If NULL,
* a simple power model is used.
* @dyn_power_coeff: Coefficient for the simple dynamic power model in
* mW/(MHz mV mV).
* If get_dynamic_power() is NULL, then the
* dynamic power is calculated as
* @dyn_power_coeff * frequency * voltage^2
*/
struct devfreq_cooling_power {
unsigned long (*get_static_power)(struct devfreq *devfreq,
unsigned long voltage);
unsigned long (*get_dynamic_power)(struct devfreq *devfreq,
unsigned long freq,
unsigned long voltage);
unsigned long dyn_power_coeff;
};
#ifdef CONFIG_DEVFREQ_THERMAL
struct thermal_cooling_device *
of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
struct devfreq_cooling_power *dfc_power);
struct thermal_cooling_device *
of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df);
void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);
#else /* !CONFIG_DEVFREQ_THERMAL */
struct thermal_cooling_device *
of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
struct devfreq_cooling_power *dfc_power)
{
return ERR_PTR(-EINVAL);
}
static inline struct thermal_cooling_device *
of_devfreq_cooling_register(struct device_node *np, struct devfreq *df)
{
return ERR_PTR(-EINVAL);
}
static inline struct thermal_cooling_device *
devfreq_cooling_register(struct devfreq *df)
{
return ERR_PTR(-EINVAL);
}
static inline void
devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
{
}
#endif /* CONFIG_DEVFREQ_THERMAL */
#endif /* __DEVFREQ_COOLING_H__ */