1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * thermal_core.h
4 *
5 * Copyright (C) 2012 Intel Corp
6 * Author: Durgadoss R <durgadoss.r@intel.com>
7 */
8
9 #ifndef __THERMAL_CORE_H__
10 #define __THERMAL_CORE_H__
11
12 #include <linux/device.h>
13 #include <linux/thermal.h>
14
15 #include "thermal_netlink.h"
16
17 /* Default Thermal Governor */
18 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
19 #define DEFAULT_THERMAL_GOVERNOR "step_wise"
20 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
21 #define DEFAULT_THERMAL_GOVERNOR "fair_share"
22 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
23 #define DEFAULT_THERMAL_GOVERNOR "user_space"
24 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR)
25 #define DEFAULT_THERMAL_GOVERNOR "power_allocator"
26 #endif
27
28 /* Initial state of a cooling device during binding */
29 #define THERMAL_NO_TARGET -1UL
30
31 /* Init section thermal table */
32 extern struct thermal_governor *__governor_thermal_table[];
33 extern struct thermal_governor *__governor_thermal_table_end[];
34
35 #define THERMAL_TABLE_ENTRY(table, name) \
36 static typeof(name) *__thermal_table_entry_##name \
37 __used __section("__" #table "_thermal_table") = &name
38
39 #define THERMAL_GOVERNOR_DECLARE(name) THERMAL_TABLE_ENTRY(governor, name)
40
41 #define for_each_governor_table(__governor) \
42 for (__governor = __governor_thermal_table; \
43 __governor < __governor_thermal_table_end; \
44 __governor++)
45
46 int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
47 void *);
48
49 int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
50 void *), void *);
51
52 int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
53 void *thermal_governor);
54
55 struct thermal_zone_device *thermal_zone_get_by_id(int id);
56
57 struct thermal_attr {
58 struct device_attribute attr;
59 char name[THERMAL_NAME_LENGTH];
60 };
61
cdev_is_power_actor(struct thermal_cooling_device * cdev)62 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
63 {
64 return cdev->ops->get_requested_power && cdev->ops->state2power &&
65 cdev->ops->power2state;
66 }
67
68 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
69 u32 *max_power);
70 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
71 u32 *min_power);
72 int power_actor_set_power(struct thermal_cooling_device *cdev,
73 struct thermal_instance *ti, u32 power);
74 /**
75 * struct thermal_trip - representation of a point in temperature domain
76 * @np: pointer to struct device_node that this trip point was created from
77 * @temperature: temperature value in miliCelsius
78 * @hysteresis: relative hysteresis in miliCelsius
79 * @type: trip point type
80 */
81 struct thermal_trip {
82 struct device_node *np;
83 int temperature;
84 int hysteresis;
85 enum thermal_trip_type type;
86 };
87
88 int get_tz_trend(struct thermal_zone_device *tz, int trip);
89
90 struct thermal_instance *
91 get_thermal_instance(struct thermal_zone_device *tz,
92 struct thermal_cooling_device *cdev,
93 int trip);
94
95 /*
96 * This structure is used to describe the behavior of
97 * a certain cooling device on a certain trip point
98 * in a certain thermal zone
99 */
100 struct thermal_instance {
101 int id;
102 char name[THERMAL_NAME_LENGTH];
103 struct thermal_zone_device *tz;
104 struct thermal_cooling_device *cdev;
105 int trip;
106 bool initialized;
107 unsigned long upper; /* Highest cooling state for this trip point */
108 unsigned long lower; /* Lowest cooling state for this trip point */
109 unsigned long target; /* expected cooling state */
110 char attr_name[THERMAL_NAME_LENGTH];
111 struct device_attribute attr;
112 char weight_attr_name[THERMAL_NAME_LENGTH];
113 struct device_attribute weight_attr;
114 struct list_head tz_node; /* node in tz->thermal_instances */
115 struct list_head cdev_node; /* node in cdev->thermal_instances */
116 unsigned int weight; /* The weight of the cooling device */
117 };
118
119 #define to_thermal_zone(_dev) \
120 container_of(_dev, struct thermal_zone_device, device)
121
122 #define to_cooling_device(_dev) \
123 container_of(_dev, struct thermal_cooling_device, device)
124
125 int thermal_register_governor(struct thermal_governor *);
126 void thermal_unregister_governor(struct thermal_governor *);
127 void thermal_zone_device_rebind_exception(struct thermal_zone_device *,
128 const char *, size_t);
129 void thermal_zone_device_unbind_exception(struct thermal_zone_device *,
130 const char *, size_t);
131 int thermal_zone_device_set_policy(struct thermal_zone_device *, char *);
132 int thermal_build_list_of_policies(char *buf);
133
134 /* Helpers */
135 void thermal_zone_set_trips(struct thermal_zone_device *tz);
136
137 /* sysfs I/F */
138 int thermal_zone_create_device_groups(struct thermal_zone_device *, int);
139 void thermal_zone_destroy_device_groups(struct thermal_zone_device *);
140 void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *);
141 void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev);
142 /* used only at binding time */
143 ssize_t trip_point_show(struct device *, struct device_attribute *, char *);
144 ssize_t weight_show(struct device *, struct device_attribute *, char *);
145 ssize_t weight_store(struct device *, struct device_attribute *, const char *,
146 size_t);
147
148 #ifdef CONFIG_THERMAL_STATISTICS
149 void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
150 unsigned long new_state);
151 #else
152 static inline void
thermal_cooling_device_stats_update(struct thermal_cooling_device * cdev,unsigned long new_state)153 thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
154 unsigned long new_state) {}
155 #endif /* CONFIG_THERMAL_STATISTICS */
156
157 /* device tree support */
158 #ifdef CONFIG_THERMAL_OF
159 int of_parse_thermal_zones(void);
160 int of_thermal_get_ntrips(struct thermal_zone_device *);
161 bool of_thermal_is_trip_valid(struct thermal_zone_device *, int);
162 const struct thermal_trip *
163 of_thermal_get_trip_points(struct thermal_zone_device *);
164 #else
of_parse_thermal_zones(void)165 static inline int of_parse_thermal_zones(void) { return 0; }
of_thermal_get_ntrips(struct thermal_zone_device * tz)166 static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
167 {
168 return 0;
169 }
of_thermal_is_trip_valid(struct thermal_zone_device * tz,int trip)170 static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
171 int trip)
172 {
173 return false;
174 }
175 static inline const struct thermal_trip *
of_thermal_get_trip_points(struct thermal_zone_device * tz)176 of_thermal_get_trip_points(struct thermal_zone_device *tz)
177 {
178 return NULL;
179 }
180 #endif
181
182 int thermal_zone_device_is_enabled(struct thermal_zone_device *tz);
183
184 #endif /* __THERMAL_CORE_H__ */
185