Merge tag 'for-linus-20160523' of git://git.infradead.org/linux-mtd
[linux-2.6-block.git] / include / linux / devfreq_cooling.h
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1/*
2 * devfreq_cooling: Thermal cooling device implementation for devices using
3 * devfreq
4 *
5 * Copyright (C) 2014-2015 ARM Limited
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
12 * kind, whether express or implied; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#ifndef __DEVFREQ_COOLING_H__
18#define __DEVFREQ_COOLING_H__
19
20#include <linux/devfreq.h>
21#include <linux/thermal.h>
22
23#ifdef CONFIG_DEVFREQ_THERMAL
24
25/**
26 * struct devfreq_cooling_power - Devfreq cooling power ops
27 * @get_static_power: Take voltage, in mV, and return the static power
28 * in mW. If NULL, the static power is assumed
29 * to be 0.
30 * @get_dynamic_power: Take voltage, in mV, and frequency, in HZ, and
31 * return the dynamic power draw in mW. If NULL,
32 * a simple power model is used.
33 * @dyn_power_coeff: Coefficient for the simple dynamic power model in
34 * mW/(MHz mV mV).
35 * If get_dynamic_power() is NULL, then the
36 * dynamic power is calculated as
37 * @dyn_power_coeff * frequency * voltage^2
38 */
39struct devfreq_cooling_power {
40 unsigned long (*get_static_power)(unsigned long voltage);
41 unsigned long (*get_dynamic_power)(unsigned long freq,
42 unsigned long voltage);
43 unsigned long dyn_power_coeff;
44};
45
3c99c2ce 46struct thermal_cooling_device *
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47of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
48 struct devfreq_cooling_power *dfc_power);
3c99c2ce 49struct thermal_cooling_device *
a76caf55 50of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
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51struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df);
52void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);
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53
54#else /* !CONFIG_DEVFREQ_THERMAL */
55
3c99c2ce 56struct thermal_cooling_device *
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57of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
58 struct devfreq_cooling_power *dfc_power)
59{
60 return ERR_PTR(-EINVAL);
61}
62
3c99c2ce 63static inline struct thermal_cooling_device *
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64of_devfreq_cooling_register(struct device_node *np, struct devfreq *df)
65{
66 return ERR_PTR(-EINVAL);
67}
68
3c99c2ce 69static inline struct thermal_cooling_device *
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70devfreq_cooling_register(struct devfreq *df)
71{
72 return ERR_PTR(-EINVAL);
73}
74
75static inline void
3c99c2ce 76devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
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77{
78}
79
80#endif /* CONFIG_DEVFREQ_THERMAL */
81#endif /* __DEVFREQ_COOLING_H__ */