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 int __for_each_thermal_trip(struct thermal_zone_device *, 56 int (*cb)(struct thermal_trip *, void *), 57 void *); 58 59 struct thermal_zone_device *thermal_zone_get_by_id(int id); 60 61 struct thermal_attr { 62 struct device_attribute attr; 63 char name[THERMAL_NAME_LENGTH]; 64 }; 65 66 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev) 67 { 68 return cdev->ops->get_requested_power && cdev->ops->state2power && 69 cdev->ops->power2state; 70 } 71 72 void thermal_cdev_update(struct thermal_cooling_device *); 73 void __thermal_cdev_update(struct thermal_cooling_device *cdev); 74 75 int get_tz_trend(struct thermal_zone_device *tz, int trip); 76 77 struct thermal_instance * 78 get_thermal_instance(struct thermal_zone_device *tz, 79 struct thermal_cooling_device *cdev, 80 int trip); 81 82 /* 83 * This structure is used to describe the behavior of 84 * a certain cooling device on a certain trip point 85 * in a certain thermal zone 86 */ 87 struct thermal_instance { 88 int id; 89 char name[THERMAL_NAME_LENGTH]; 90 struct thermal_zone_device *tz; 91 struct thermal_cooling_device *cdev; 92 int trip; 93 bool initialized; 94 unsigned long upper; /* Highest cooling state for this trip point */ 95 unsigned long lower; /* Lowest cooling state for this trip point */ 96 unsigned long target; /* expected cooling state */ 97 char attr_name[THERMAL_NAME_LENGTH]; 98 struct device_attribute attr; 99 char weight_attr_name[THERMAL_NAME_LENGTH]; 100 struct device_attribute weight_attr; 101 struct list_head tz_node; /* node in tz->thermal_instances */ 102 struct list_head cdev_node; /* node in cdev->thermal_instances */ 103 unsigned int weight; /* The weight of the cooling device */ 104 bool upper_no_limit; 105 }; 106 107 #define to_thermal_zone(_dev) \ 108 container_of(_dev, struct thermal_zone_device, device) 109 110 #define to_cooling_device(_dev) \ 111 container_of(_dev, struct thermal_cooling_device, device) 112 113 int thermal_register_governor(struct thermal_governor *); 114 void thermal_unregister_governor(struct thermal_governor *); 115 int thermal_zone_device_set_policy(struct thermal_zone_device *, char *); 116 int thermal_build_list_of_policies(char *buf); 117 void __thermal_zone_device_update(struct thermal_zone_device *tz, 118 enum thermal_notify_event event); 119 120 /* Helpers */ 121 void __thermal_zone_set_trips(struct thermal_zone_device *tz); 122 int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id, 123 struct thermal_trip *trip); 124 int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp); 125 126 /* sysfs I/F */ 127 int thermal_zone_create_device_groups(struct thermal_zone_device *, int); 128 void thermal_zone_destroy_device_groups(struct thermal_zone_device *); 129 void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *); 130 void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev); 131 void thermal_cooling_device_stats_reinit(struct thermal_cooling_device *cdev); 132 /* used only at binding time */ 133 ssize_t trip_point_show(struct device *, struct device_attribute *, char *); 134 ssize_t weight_show(struct device *, struct device_attribute *, char *); 135 ssize_t weight_store(struct device *, struct device_attribute *, const char *, 136 size_t); 137 138 #ifdef CONFIG_THERMAL_STATISTICS 139 void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev, 140 unsigned long new_state); 141 #else 142 static inline void 143 thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev, 144 unsigned long new_state) {} 145 #endif /* CONFIG_THERMAL_STATISTICS */ 146 147 /* device tree support */ 148 int thermal_zone_device_is_enabled(struct thermal_zone_device *tz); 149 150 #endif /* __THERMAL_CORE_H__ */ 151