Quelle devfreq_cooling.h Sprache: C

/* 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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