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 <[email protected]>
   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 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_BANG_BANG)
  27 #define DEFAULT_THERMAL_GOVERNOR       "bang_bang"
  28 #endif
  29
  30 /* Initial state of a cooling device during binding */
  31 #define THERMAL_NO_TARGET -1UL
  32
  33 /* Init section thermal table */
  34 extern struct thermal_governor *__governor_thermal_table[];
  35 extern struct thermal_governor *__governor_thermal_table_end[];
  36
  37 #define THERMAL_TABLE_ENTRY(table, name)                        \
  38         static typeof(name) *__thermal_table_entry_##name       \
  39         __used __section("__" #table "_thermal_table") = &name
  40
  41 #define THERMAL_GOVERNOR_DECLARE(name)  THERMAL_TABLE_ENTRY(governor, name)
  42
  43 #define for_each_governor_table(__governor)             \
  44         for (__governor = __governor_thermal_table;     \
  45              __governor < __governor_thermal_table_end; \
  46              __governor++)
  47
  48 int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
  49                           void *);
  50
  51 int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
  52                                               void *), void *);
  53
  54 int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
  55                               void *thermal_governor);
  56
  57 struct thermal_zone_device *thermal_zone_get_by_id(int id);
  58
  59 struct thermal_attr {
  60         struct device_attribute attr;
  61         char name[THERMAL_NAME_LENGTH];
  62 };
  63
  64 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
  65 {
  66         return cdev->ops->get_requested_power && cdev->ops->state2power &&
  67                 cdev->ops->power2state;
  68 }
  69
  70 void thermal_cdev_update(struct thermal_cooling_device *);
  71 void __thermal_cdev_update(struct thermal_cooling_device *cdev);
  72
  73 int get_tz_trend(struct thermal_zone_device *tz, const struct thermal_trip *trip);
  74
  75 struct thermal_instance *
  76 get_thermal_instance(struct thermal_zone_device *tz,
  77                      struct thermal_cooling_device *cdev,
  78                      int trip);
  79
  80 /*
  81  * This structure is used to describe the behavior of
  82  * a certain cooling device on a certain trip point
  83  * in a certain thermal zone
  84  */
  85 struct thermal_instance {
  86         int id;
  87         char name[THERMAL_NAME_LENGTH];
  88         struct thermal_zone_device *tz;
  89         struct thermal_cooling_device *cdev;
  90         const struct thermal_trip *trip;
  91         bool initialized;
  92         unsigned long upper;    /* Highest cooling state for this trip point */
  93         unsigned long lower;    /* Lowest cooling state for this trip point */
  94         unsigned long target;   /* expected cooling state */
  95         char attr_name[THERMAL_NAME_LENGTH];
  96         struct device_attribute attr;
  97         char weight_attr_name[THERMAL_NAME_LENGTH];
  98         struct device_attribute weight_attr;
  99         struct list_head tz_node; /* node in tz->thermal_instances */
 100         struct list_head cdev_node; /* node in cdev->thermal_instances */
 101         unsigned int weight; /* The weight of the cooling device */
 102         bool upper_no_limit;
 103 };
 104
 105 #define to_thermal_zone(_dev) \
 106         container_of(_dev, struct thermal_zone_device, device)
 107
 108 #define to_cooling_device(_dev) \
 109         container_of(_dev, struct thermal_cooling_device, device)
 110
 111 int thermal_register_governor(struct thermal_governor *);
 112 void thermal_unregister_governor(struct thermal_governor *);
 113 int thermal_zone_device_set_policy(struct thermal_zone_device *, char *);
 114 int thermal_build_list_of_policies(char *buf);
 115 void __thermal_zone_device_update(struct thermal_zone_device *tz,
 116                                   enum thermal_notify_event event);
 117
 118 /* Helpers */
 119 #define for_each_trip(__tz, __trip)     \
 120         for (__trip = __tz->trips; __trip - __tz->trips < __tz->num_trips; __trip++)
 121
 122 void __thermal_zone_set_trips(struct thermal_zone_device *tz);
 123 int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 124                             struct thermal_trip *trip);
 125 int thermal_zone_trip_id(struct thermal_zone_device *tz,
 126                          const struct thermal_trip *trip);
 127 int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
 128
 129 /* sysfs I/F */
 130 int thermal_zone_create_device_groups(struct thermal_zone_device *, int);
 131 void thermal_zone_destroy_device_groups(struct thermal_zone_device *);
 132 void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *);
 133 void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev);
 134 void thermal_cooling_device_stats_reinit(struct thermal_cooling_device *cdev);
 135 /* used only at binding time */
 136 ssize_t trip_point_show(struct device *, struct device_attribute *, char *);
 137 ssize_t weight_show(struct device *, struct device_attribute *, char *);
 138 ssize_t weight_store(struct device *, struct device_attribute *, const char *,
 139                      size_t);
 140
 141 #ifdef CONFIG_THERMAL_STATISTICS
 142 void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
 143                                          unsigned long new_state);
 144 #else
 145 static inline void
 146 thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
 147                                     unsigned long new_state) {}
 148 #endif /* CONFIG_THERMAL_STATISTICS */
 149
 150 /* device tree support */
 151 int thermal_zone_device_is_enabled(struct thermal_zone_device *tz);
 152
 153 #endif /* __THERMAL_CORE_H__ */