1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * devfreq_cooling: Thermal cooling device implementation for devices using
4 * devfreq
5 *
6 * Copyright (C) 2014-2015 ARM Limited
7 *
8 */
9
10 #ifndef __DEVFREQ_COOLING_H__
11 #define __DEVFREQ_COOLING_H__
12
13 #include <linux/devfreq.h>
14 #include <linux/thermal.h>
15
16
17 /**
18 * struct devfreq_cooling_power - Devfreq cooling power ops
19 * @get_real_power: When this is set, the framework uses it to ask the
20 * device driver for the actual power.
21 * Some devices have more sophisticated methods
22 * (like power counters) to approximate the actual power
23 * that they use.
24 * This function provides more accurate data to the
25 * thermal governor. When the driver does not provide
26 * such function, framework just uses pre-calculated
27 * table and scale the power by 'utilization'
28 * (based on 'busy_time' and 'total_time' taken from
29 * devfreq 'last_status').
30 * The value returned by this function must be lower
31 * or equal than the maximum power value
32 * for the current state
33 * (which can be found in power_table[state]).
34 * When this interface is used, the power_table holds
35 * max total (static + dynamic) power value for each OPP.
36 */
37 struct devfreq_cooling_power {
38 int (*get_real_power)(struct devfreq *df, u32 *power,
39 unsigned long freq, unsigned long voltage);
40 };
41
42 #ifdef CONFIG_DEVFREQ_THERMAL
43
44 struct thermal_cooling_device *
45 of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
46 struct devfreq_cooling_power *dfc_power);
47 struct thermal_cooling_device *
48 of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
49 struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df);
50 void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);
51 struct thermal_cooling_device *
52 devfreq_cooling_em_register(struct devfreq *df,
53 struct devfreq_cooling_power *dfc_power);
54
55 #else /* !CONFIG_DEVFREQ_THERMAL */
56
57 static inline struct thermal_cooling_device *
58 of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
59 struct devfreq_cooling_power *dfc_power)
60 {
61 return ERR_PTR(-EINVAL);
62 }
63
64 static inline struct thermal_cooling_device *
65 of_devfreq_cooling_register(struct device_node *np, struct devfreq *df)
66 {
67 return ERR_PTR(-EINVAL);
68 }
69
70 static inline struct thermal_cooling_device *
71 devfreq_cooling_register(struct devfreq *df)
72 {
73 return ERR_PTR(-EINVAL);
74 }
75
76 static inline struct thermal_cooling_device *
77 devfreq_cooling_em_register(struct devfreq *df,
78 struct devfreq_cooling_power *dfc_power)
79 {
80 return ERR_PTR(-EINVAL);
81 }
82
83 static inline void
84 devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
85 {
86 }
87
88 #endif /* CONFIG_DEVFREQ_THERMAL */
89 #endif /* __DEVFREQ_COOLING_H__ */
90
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