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 /* Init section thermal table */
  19 extern struct thermal_governor *__governor_thermal_table[];
  20 extern struct thermal_governor *__governor_thermal_table_end[];
  21
  22 #define THERMAL_TABLE_ENTRY(table, name)                        \
  23         static typeof(name) *__thermal_table_entry_##name       \
  24         __used __section(__##table##_thermal_table) = &name
  25
  26 #define THERMAL_GOVERNOR_DECLARE(name)  THERMAL_TABLE_ENTRY(governor, name)
  27
  28 #define for_each_governor_table(__governor)             \
  29         for (__governor = __governor_thermal_table;     \
  30              __governor < __governor_thermal_table_end; \
  31              __governor++)
  32
  33 /*
  34  * This structure is used to describe the behavior of
  35  * a certain cooling device on a certain trip point
  36  * in a certain thermal zone
  37  */
  38 struct thermal_instance {
  39         int id;
  40         char name[THERMAL_NAME_LENGTH];
  41         struct thermal_zone_device *tz;
  42         struct thermal_cooling_device *cdev;
  43         int trip;
  44         bool initialized;
  45         unsigned long upper;    /* Highest cooling state for this trip point */
  46         unsigned long lower;    /* Lowest cooling state for this trip point */
  47         unsigned long target;   /* expected cooling state */
  48         char attr_name[THERMAL_NAME_LENGTH];
  49         struct device_attribute attr;
  50         char weight_attr_name[THERMAL_NAME_LENGTH];
  51         struct device_attribute weight_attr;
  52         struct list_head tz_node; /* node in tz->thermal_instances */
  53         struct list_head cdev_node; /* node in cdev->thermal_instances */
  54         unsigned int weight; /* The weight of the cooling device */
  55 };
  56
  57 #define to_thermal_zone(_dev) \
  58         container_of(_dev, struct thermal_zone_device, device)
  59
  60 #define to_cooling_device(_dev) \
  61         container_of(_dev, struct thermal_cooling_device, device)
  62
  63 int thermal_register_governor(struct thermal_governor *);
  64 void thermal_unregister_governor(struct thermal_governor *);
  65 void thermal_zone_device_rebind_exception(struct thermal_zone_device *,
  66                                           const char *, size_t);
  67 void thermal_zone_device_unbind_exception(struct thermal_zone_device *,
  68                                           const char *, size_t);
  69 int thermal_zone_device_set_policy(struct thermal_zone_device *, char *);
  70 int thermal_build_list_of_policies(char *buf);
  71
  72 /* sysfs I/F */
  73 int thermal_zone_create_device_groups(struct thermal_zone_device *, int);
  74 void thermal_zone_destroy_device_groups(struct thermal_zone_device *);
  75 void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *);
  76 void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev);
  77 /* used only at binding time */
  78 ssize_t trip_point_show(struct device *, struct device_attribute *, char *);
  79 ssize_t weight_show(struct device *, struct device_attribute *, char *);
  80 ssize_t weight_store(struct device *, struct device_attribute *, const char *,
  81                      size_t);
  82
  83 #ifdef CONFIG_THERMAL_STATISTICS
  84 void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
  85                                          unsigned long new_state);
  86 #else
  87 static inline void
  88 thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
  89                                     unsigned long new_state) {}
  90 #endif /* CONFIG_THERMAL_STATISTICS */
  91
  92 /* device tree support */
  93 #ifdef CONFIG_THERMAL_OF
  94 int of_parse_thermal_zones(void);
  95 int of_thermal_get_ntrips(struct thermal_zone_device *);
  96 bool of_thermal_is_trip_valid(struct thermal_zone_device *, int);
  97 const struct thermal_trip *
  98 of_thermal_get_trip_points(struct thermal_zone_device *);
  99 #else
 100 static inline int of_parse_thermal_zones(void) { return 0; }
 101 static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
 102 {
 103         return 0;
 104 }
 105 static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
 106                                             int trip)
 107 {
 108         return false;
 109 }
 110 static inline const struct thermal_trip *
 111 of_thermal_get_trip_points(struct thermal_zone_device *tz)
 112 {
 113         return NULL;
 114 }
 115 #endif
 116
 117 #endif /* __THERMAL_CORE_H__ */