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3aa5374376
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>
85 lines
2.6 KiB
C
85 lines
2.6 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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*/
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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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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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