/* SPDX-License-Identifier: GPL-2.0 */
/*
* devfreq_cooling : Thermal cooling device implementation for devices using
* devfreq
*
* Copyright ( C ) 2014 - 2015 ARM Limited
*
*/
#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_real_power : When this is set , the framework uses it to ask the
* device driver for the actual power .
* Some devices have more sophisticated methods
* ( like power counters ) to approximate the actual power
* that they use .
* This function provides more accurate data to the
* thermal governor . When the driver does not provide
* such function , framework just uses pre - calculated
* table and scale the power by ' utilization '
* ( based on ' busy_time ' and ' total_time ' taken from
* devfreq ' last_status ' ) .
* The value returned by this function must be lower
* or equal than the maximum power value
* for the current state
* ( which can be found in power_table [ state ] ) .
* When this interface is used , the power_table holds
* max total ( static + dynamic ) power value for each OPP .
*/
struct devfreq_cooling_power {
int (*get_real_power)(struct devfreq *df, u32 *power,
unsigned long freq, unsigned long voltage);
};
#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);
struct thermal_cooling_device *
devfreq_cooling_em_register(struct devfreq *df,
struct devfreq_cooling_power *dfc_power);
#else /* !CONFIG_DEVFREQ_THERMAL */
static inline 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 struct thermal_cooling_device *
devfreq_cooling_em_register(struct devfreq *df,
struct devfreq_cooling_power *dfc_power)
{
return ERR_PTR(-EINVAL);
}
static inline void
devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
{
}
#endif /* CONFIG_DEVFREQ_THERMAL */
#endif /* __DEVFREQ_COOLING_H__ */
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