drivers/thermal/thermal_core.h

   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
  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 /**
  69  * struct thermal_trip - representation of a point in temperature domain
  70  * @np: pointer to struct device_node that this trip point was created from
  71  * @temperature: temperature value in miliCelsius
  72  * @hysteresis: relative hysteresis in miliCelsius
  73  * @type: trip point type
  74  */
  75 struct thermal_trip {
  76         struct device_node *np;
  77         int temperature;
  78         int hysteresis;
  79         enum thermal_trip_type type;
  80 };
  81
  82 int get_tz_trend(struct thermal_zone_device *tz, int trip);
  83
  84 struct thermal_instance *
  85 get_thermal_instance(struct thermal_zone_device *tz,
  86                      struct thermal_cooling_device *cdev,
  87                      int trip);
  88
  89 /*
  90  * This structure is used to describe the behavior of
  91  * a certain cooling device on a certain trip point
  92  * in a certain thermal zone
  93  */
  94 struct thermal_instance {
  95         int id;
  96         char name[THERMAL_NAME_LENGTH];
  97         struct thermal_zone_device *tz;
  98         struct thermal_cooling_device *cdev;
  99         int trip;
 100         bool initialized;
 101         unsigned long upper;    /* Highest cooling state for this trip point */
 102         unsigned long lower;    /* Lowest cooling state for this trip point */
 103         unsigned long target;   /* expected cooling state */
 104         char attr_name[THERMAL_NAME_LENGTH];
 105         struct device_attribute attr;
 106         char weight_attr_name[THERMAL_NAME_LENGTH];
 107         struct device_attribute weight_attr;
 108         struct list_head tz_node; /* node in tz->thermal_instances */
 109         struct list_head cdev_node; /* node in cdev->thermal_instances */
 110         unsigned int weight; /* The weight of the cooling device */
 111 };
 112
 113 #define to_thermal_zone(_dev) \
 114         container_of(_dev, struct thermal_zone_device, device)
 115
 116 #define to_cooling_device(_dev) \
 117         container_of(_dev, struct thermal_cooling_device, device)
 118
 119 int thermal_register_governor(struct thermal_governor *);
 120 void thermal_unregister_governor(struct thermal_governor *);
 121 void thermal_zone_device_rebind_exception(struct thermal_zone_device *,
 122                                           const char *, size_t);
 123 void thermal_zone_device_unbind_exception(struct thermal_zone_device *,
 124                                           const char *, size_t);
 125 int thermal_zone_device_set_policy(struct thermal_zone_device *, char *);
 126 int thermal_build_list_of_policies(char *buf);
 127
 128 /* Helpers */
 129 void thermal_zone_set_trips(struct thermal_zone_device *tz);
 130
 131 /* sysfs I/F */
 132 int thermal_zone_create_device_groups(struct thermal_zone_device *, int);
 133 void thermal_zone_destroy_device_groups(struct thermal_zone_device *);
 134 void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *);
 135 void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev);
 136 /* used only at binding time */
 137 ssize_t trip_point_show(struct device *, struct device_attribute *, char *);
 138 ssize_t weight_show(struct device *, struct device_attribute *, char *);
 139 ssize_t weight_store(struct device *, struct device_attribute *, const char *,
 140                      size_t);
 141
 142 #ifdef CONFIG_THERMAL_STATISTICS
 143 void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
 144                                          unsigned long new_state);
 145 #else
 146 static inline void
 147 thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
 148                                     unsigned long new_state) {}
 149 #endif /* CONFIG_THERMAL_STATISTICS */
 150
 151 /* device tree support */
 152 #ifdef CONFIG_THERMAL_OF
 153 int of_parse_thermal_zones(void);
 154 int of_thermal_get_ntrips(struct thermal_zone_device *);
 155 bool of_thermal_is_trip_valid(struct thermal_zone_device *, int);
 156 const struct thermal_trip *
 157 of_thermal_get_trip_points(struct thermal_zone_device *);
 158 #else
 159 static inline int of_parse_thermal_zones(void) { return 0; }
 160 static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
 161 {
 162         return 0;
 163 }
 164 static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
 165                                             int trip)
 166 {
 167         return false;
 168 }
 169 static inline const struct thermal_trip *
 170 of_thermal_get_trip_points(struct thermal_zone_device *tz)
 171 {
 172         return NULL;
 173 }
 174 #endif
 175
 176 int thermal_zone_device_is_enabled(struct thermal_zone_device *tz);
 177
 178 #endif /* __THERMAL_CORE_H__ */