104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/*
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* devfreq_cooling: Thermal cooling device implementation for devices using
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* devfreq
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*
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* Copyright (C) 2014-2015 ARM Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __DEVFREQ_COOLING_H__
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#define __DEVFREQ_COOLING_H__
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#include <linux/devfreq.h>
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#include <linux/thermal.h>
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/**
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* struct devfreq_cooling_power - Devfreq cooling power ops
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* @get_static_power: Take voltage, in mV, and return the static power
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* in mW. If NULL, the static power is assumed
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* to be 0.
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* @get_dynamic_power: Take voltage, in mV, and frequency, in HZ, and
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* return the dynamic power draw in mW. If NULL,
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* a simple power model is used.
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* @dyn_power_coeff: Coefficient for the simple dynamic power model in
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* mW/(MHz mV mV).
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* If get_dynamic_power() is NULL, then the
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* dynamic power is calculated as
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* @dyn_power_coeff * frequency * voltage^2
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* @get_real_power: When this is set, the framework uses it to ask the
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* device driver for the actual power.
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* Some devices have more sophisticated methods
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* (like power counters) to approximate the actual power
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* that they use.
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* This function provides more accurate data to the
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* thermal governor. When the driver does not provide
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* such function, framework just uses pre-calculated
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* table and scale the power by 'utilization'
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* (based on 'busy_time' and 'total_time' taken from
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* devfreq 'last_status').
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* The value returned by this function must be lower
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* or equal than the maximum power value
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* for the current state
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* (which can be found in power_table[state]).
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* When this interface is used, the power_table holds
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* max total (static + dynamic) power value for each OPP.
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*/
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struct devfreq_cooling_power {
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unsigned long (*get_static_power)(struct devfreq *devfreq,
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unsigned long voltage);
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unsigned long (*get_dynamic_power)(struct devfreq *devfreq,
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unsigned long freq,
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unsigned long voltage);
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int (*get_real_power)(struct devfreq *df, u32 *power,
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unsigned long freq, unsigned long voltage);
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unsigned long dyn_power_coeff;
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};
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#ifdef CONFIG_DEVFREQ_THERMAL
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struct thermal_cooling_device *
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of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
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struct devfreq_cooling_power *dfc_power);
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struct thermal_cooling_device *
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of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
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struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df);
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void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);
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#else /* !CONFIG_DEVFREQ_THERMAL */
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struct thermal_cooling_device *
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of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
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struct devfreq_cooling_power *dfc_power)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline struct thermal_cooling_device *
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of_devfreq_cooling_register(struct device_node *np, struct devfreq *df)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline struct thermal_cooling_device *
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devfreq_cooling_register(struct devfreq *df)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline void
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devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
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{
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}
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#endif /* CONFIG_DEVFREQ_THERMAL */
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#endif /* __DEVFREQ_COOLING_H__ */
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