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 /* Initial state of a cooling device during binding */
  16 #define THERMAL_NO_TARGET -1UL
  17
  18 /*
  19  * This structure is used to describe the behavior of
  20  * a certain cooling device on a certain trip point
  21  * in a certain thermal zone
  22  */
  23 struct thermal_instance {
  24         int id;
  25         char name[THERMAL_NAME_LENGTH];
  26         struct thermal_zone_device *tz;
  27         struct thermal_cooling_device *cdev;
  28         int trip;
  29         bool initialized;
  30         unsigned long upper;    /* Highest cooling state for this trip point */
  31         unsigned long lower;    /* Lowest cooling state for this trip point */
  32         unsigned long target;   /* expected cooling state */
  33         char attr_name[THERMAL_NAME_LENGTH];
  34         struct device_attribute attr;
  35         char weight_attr_name[THERMAL_NAME_LENGTH];
  36         struct device_attribute weight_attr;
  37         struct list_head tz_node; /* node in tz->thermal_instances */
  38         struct list_head cdev_node; /* node in cdev->thermal_instances */
  39         unsigned int weight; /* The weight of the cooling device */
  40 };
  41
  42 #define to_thermal_zone(_dev) \
  43         container_of(_dev, struct thermal_zone_device, device)
  44
  45 #define to_cooling_device(_dev) \
  46         container_of(_dev, struct thermal_cooling_device, device)
  47
  48 int thermal_register_governor(struct thermal_governor *);
  49 void thermal_unregister_governor(struct thermal_governor *);
  50 void thermal_zone_device_rebind_exception(struct thermal_zone_device *,
  51                                           const char *, size_t);
  52 void thermal_zone_device_unbind_exception(struct thermal_zone_device *,
  53                                           const char *, size_t);
  54 int thermal_zone_device_set_policy(struct thermal_zone_device *, char *);
  55 int thermal_build_list_of_policies(char *buf);
  56
  57 /* sysfs I/F */
  58 int thermal_zone_create_device_groups(struct thermal_zone_device *, int);
  59 void thermal_zone_destroy_device_groups(struct thermal_zone_device *);
  60 void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *);
  61 void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev);
  62 /* used only at binding time */
  63 ssize_t trip_point_show(struct device *, struct device_attribute *, char *);
  64 ssize_t weight_show(struct device *, struct device_attribute *, char *);
  65 ssize_t weight_store(struct device *, struct device_attribute *, const char *,
  66                      size_t);
  67
  68 #ifdef CONFIG_THERMAL_STATISTICS
  69 void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
  70                                          unsigned long new_state);
  71 #else
  72 static inline void
  73 thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
  74                                     unsigned long new_state) {}
  75 #endif /* CONFIG_THERMAL_STATISTICS */
  76
  77 #ifdef CONFIG_THERMAL_GOV_STEP_WISE
  78 int thermal_gov_step_wise_register(void);
  79 void thermal_gov_step_wise_unregister(void);
  80 #else
  81 static inline int thermal_gov_step_wise_register(void) { return 0; }
  82 static inline void thermal_gov_step_wise_unregister(void) {}
  83 #endif /* CONFIG_THERMAL_GOV_STEP_WISE */
  84
  85 #ifdef CONFIG_THERMAL_GOV_FAIR_SHARE
  86 int thermal_gov_fair_share_register(void);
  87 void thermal_gov_fair_share_unregister(void);
  88 #else
  89 static inline int thermal_gov_fair_share_register(void) { return 0; }
  90 static inline void thermal_gov_fair_share_unregister(void) {}
  91 #endif /* CONFIG_THERMAL_GOV_FAIR_SHARE */
  92
  93 #ifdef CONFIG_THERMAL_GOV_BANG_BANG
  94 int thermal_gov_bang_bang_register(void);
  95 void thermal_gov_bang_bang_unregister(void);
  96 #else
  97 static inline int thermal_gov_bang_bang_register(void) { return 0; }
  98 static inline void thermal_gov_bang_bang_unregister(void) {}
  99 #endif /* CONFIG_THERMAL_GOV_BANG_BANG */
 100
 101 #ifdef CONFIG_THERMAL_GOV_USER_SPACE
 102 int thermal_gov_user_space_register(void);
 103 void thermal_gov_user_space_unregister(void);
 104 #else
 105 static inline int thermal_gov_user_space_register(void) { return 0; }
 106 static inline void thermal_gov_user_space_unregister(void) {}
 107 #endif /* CONFIG_THERMAL_GOV_USER_SPACE */
 108
 109 #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
 110 int thermal_gov_power_allocator_register(void);
 111 void thermal_gov_power_allocator_unregister(void);
 112 #else
 113 static inline int thermal_gov_power_allocator_register(void) { return 0; }
 114 static inline void thermal_gov_power_allocator_unregister(void) {}
 115 #endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */
 116
 117 /* device tree support */
 118 #ifdef CONFIG_THERMAL_OF
 119 int of_parse_thermal_zones(void);
 120 void of_thermal_destroy_zones(void);
 121 int of_thermal_get_ntrips(struct thermal_zone_device *);
 122 bool of_thermal_is_trip_valid(struct thermal_zone_device *, int);
 123 const struct thermal_trip *
 124 of_thermal_get_trip_points(struct thermal_zone_device *);
 125 #else
 126 static inline int of_parse_thermal_zones(void) { return 0; }
 127 static inline void of_thermal_destroy_zones(void) { }
 128 static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
 129 {
 130         return 0;
 131 }
 132 static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
 133                                             int trip)
 134 {
 135         return false;
 136 }
 137 static inline const struct thermal_trip *
 138 of_thermal_get_trip_points(struct thermal_zone_device *tz)
 139 {
 140         return NULL;
 141 }
 142 #endif
 143
 144 #endif /* __THERMAL_CORE_H__ */