1 /* SPDX-License-Identifier: GPL-2.0 */
3 * thermal.h ($Revision: 0 $)
5 * Copyright (C) 2008 Intel Corp
14 #include <linux/idr.h>
15 #include <linux/device.h>
16 #include <linux/sysfs.h>
17 #include <linux/workqueue.h>
18 #include <uapi/linux/thermal.h>
20 /* invalid cooling state */
21 #define THERMAL_CSTATE_INVALID -1UL
23 /* No upper/lower limit requirement */
24 #define THERMAL_NO_LIMIT ((u32)~0)
26 /* Default weight of a bound cooling device */
27 #define THERMAL_WEIGHT_DEFAULT 0
29 /* use value, which < 0K, to indicate an invalid/uninitialized temperature */
30 #define THERMAL_TEMP_INVALID -274000
32 struct thermal_zone_device;
33 struct thermal_cooling_device;
34 struct thermal_instance;
38 THERMAL_TREND_STABLE, /* temperature is stable */
39 THERMAL_TREND_RAISING, /* temperature is raising */
40 THERMAL_TREND_DROPPING, /* temperature is dropping */
43 /* Thermal notification reason */
44 enum thermal_notify_event {
45 THERMAL_EVENT_UNSPECIFIED, /* Unspecified event */
46 THERMAL_EVENT_TEMP_SAMPLE, /* New Temperature sample */
47 THERMAL_TRIP_VIOLATED, /* TRIP Point violation */
48 THERMAL_TRIP_CHANGED, /* TRIP Point temperature changed */
49 THERMAL_DEVICE_DOWN, /* Thermal device is down */
50 THERMAL_DEVICE_UP, /* Thermal device is up after a down event */
51 THERMAL_DEVICE_POWER_CAPABILITY_CHANGED, /* power capability changed */
52 THERMAL_TABLE_CHANGED, /* Thermal table(s) changed */
53 THERMAL_EVENT_KEEP_ALIVE, /* Request for user space handler to respond */
56 struct thermal_zone_device_ops {
57 int (*bind) (struct thermal_zone_device *,
58 struct thermal_cooling_device *);
59 int (*unbind) (struct thermal_zone_device *,
60 struct thermal_cooling_device *);
61 int (*get_temp) (struct thermal_zone_device *, int *);
62 int (*set_trips) (struct thermal_zone_device *, int, int);
63 int (*change_mode) (struct thermal_zone_device *,
64 enum thermal_device_mode);
65 int (*get_trip_type) (struct thermal_zone_device *, int,
66 enum thermal_trip_type *);
67 int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
68 int (*set_trip_temp) (struct thermal_zone_device *, int, int);
69 int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
70 int (*set_trip_hyst) (struct thermal_zone_device *, int, int);
71 int (*get_crit_temp) (struct thermal_zone_device *, int *);
72 int (*set_emul_temp) (struct thermal_zone_device *, int);
73 int (*get_trend) (struct thermal_zone_device *, int,
74 enum thermal_trend *);
75 void (*hot)(struct thermal_zone_device *);
76 void (*critical)(struct thermal_zone_device *);
80 * struct thermal_trip - representation of a point in temperature domain
81 * @temperature: temperature value in miliCelsius
82 * @hysteresis: relative hysteresis in miliCelsius
83 * @type: trip point type
84 * @priv: pointer to driver data associated with this trip
89 enum thermal_trip_type type;
93 struct thermal_cooling_device_ops {
94 int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
95 int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
96 int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
97 int (*get_requested_power)(struct thermal_cooling_device *, u32 *);
98 int (*state2power)(struct thermal_cooling_device *, unsigned long, u32 *);
99 int (*power2state)(struct thermal_cooling_device *, u32, unsigned long *);
102 struct thermal_cooling_device {
105 unsigned long max_state;
106 struct device device;
107 struct device_node *np;
110 const struct thermal_cooling_device_ops *ops;
111 bool updated; /* true if the cooling device does not need update */
112 struct mutex lock; /* protect thermal_instances list */
113 struct list_head thermal_instances;
114 struct list_head node;
118 * struct thermal_zone_device - structure for a thermal zone
119 * @id: unique id number for each thermal zone
120 * @type: the thermal zone device type
121 * @device: &struct device for this thermal zone
122 * @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
123 * @trip_type_attrs: attributes for trip points for sysfs: trip type
124 * @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
125 * @mode: current mode of this thermal zone
126 * @devdata: private pointer for device private data
127 * @trips: an array of struct thermal_trip
128 * @num_trips: number of trip points the thermal zone supports
129 * @trips_disabled; bitmap for disabled trips
130 * @passive_delay_jiffies: number of jiffies to wait between polls when
131 * performing passive cooling.
132 * @polling_delay_jiffies: number of jiffies to wait between polls when
133 * checking whether trip points have been crossed (0 for
134 * interrupt driven systems)
135 * @temperature: current temperature. This is only for core code,
136 * drivers should use thermal_zone_get_temp() to get the
137 * current temperature
138 * @last_temperature: previous temperature read
139 * @emul_temperature: emulated temperature when using CONFIG_THERMAL_EMULATION
140 * @passive: 1 if you've crossed a passive trip point, 0 otherwise.
141 * @prev_low_trip: the low current temperature if you've crossed a passive
143 * @prev_high_trip: the above current temperature if you've crossed a
145 * @need_update: if equals 1, thermal_zone_device_update needs to be invoked.
146 * @ops: operations this &thermal_zone_device supports
147 * @tzp: thermal zone parameters
148 * @governor: pointer to the governor for this thermal zone
149 * @governor_data: private pointer for governor data
150 * @thermal_instances: list of &struct thermal_instance of this thermal zone
151 * @ida: &struct ida to generate unique id for this zone's cooling
153 * @lock: lock to protect thermal_instances list
154 * @node: node in thermal_tz_list (in thermal_core.c)
155 * @poll_queue: delayed work for polling
156 * @notify_event: Last notification event
158 struct thermal_zone_device {
160 char type[THERMAL_NAME_LENGTH];
161 struct device device;
162 struct attribute_group trips_attribute_group;
163 struct thermal_attr *trip_temp_attrs;
164 struct thermal_attr *trip_type_attrs;
165 struct thermal_attr *trip_hyst_attrs;
166 enum thermal_device_mode mode;
168 struct thermal_trip *trips;
170 unsigned long trips_disabled; /* bitmap for disabled trips */
171 unsigned long passive_delay_jiffies;
172 unsigned long polling_delay_jiffies;
174 int last_temperature;
175 int emul_temperature;
179 atomic_t need_update;
180 struct thermal_zone_device_ops *ops;
181 struct thermal_zone_params *tzp;
182 struct thermal_governor *governor;
184 struct list_head thermal_instances;
187 struct list_head node;
188 struct delayed_work poll_queue;
189 enum thermal_notify_event notify_event;
193 * struct thermal_governor - structure that holds thermal governor information
194 * @name: name of the governor
195 * @bind_to_tz: callback called when binding to a thermal zone. If it
196 * returns 0, the governor is bound to the thermal zone,
197 * otherwise it fails.
198 * @unbind_from_tz: callback called when a governor is unbound from a
200 * @throttle: callback called for every trip point even if temperature is
201 * below the trip point temperature
202 * @governor_list: node in thermal_governor_list (in thermal_core.c)
204 struct thermal_governor {
205 char name[THERMAL_NAME_LENGTH];
206 int (*bind_to_tz)(struct thermal_zone_device *tz);
207 void (*unbind_from_tz)(struct thermal_zone_device *tz);
208 int (*throttle)(struct thermal_zone_device *tz, int trip);
209 struct list_head governor_list;
212 /* Structure to define Thermal Zone parameters */
213 struct thermal_zone_params {
214 char governor_name[THERMAL_NAME_LENGTH];
217 * a boolean to indicate if the thermal to hwmon sysfs interface
218 * is required. when no_hwmon == false, a hwmon sysfs interface
219 * will be created. when no_hwmon == true, nothing will be done
224 * Sustainable power (heat) that this thermal zone can dissipate in
227 u32 sustainable_power;
230 * Proportional parameter of the PID controller when
231 * overshooting (i.e., when temperature is below the target)
236 * Proportional parameter of the PID controller when
241 /* Integral parameter of the PID controller */
244 /* Derivative parameter of the PID controller */
247 /* threshold below which the error is no longer accumulated */
251 * @slope: slope of a linear temperature adjustment curve.
252 * Used by thermal zone drivers.
256 * @offset: offset of a linear temperature adjustment curve.
257 * Used by thermal zone drivers (default 0).
262 /* Function declarations */
263 #ifdef CONFIG_THERMAL_OF
264 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
265 const struct thermal_zone_device_ops *ops);
267 void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_device *tz);
272 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
273 const struct thermal_zone_device_ops *ops)
275 return ERR_PTR(-ENOTSUPP);
278 static inline void devm_thermal_of_zone_unregister(struct device *dev,
279 struct thermal_zone_device *tz)
284 int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
285 struct thermal_trip *trip);
286 int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
287 struct thermal_trip *trip);
289 int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
290 const struct thermal_trip *trip);
292 int for_each_thermal_trip(struct thermal_zone_device *tz,
293 int (*cb)(struct thermal_trip *, void *),
295 int thermal_zone_get_num_trips(struct thermal_zone_device *tz);
297 int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp);
299 #ifdef CONFIG_THERMAL_ACPI
300 int thermal_acpi_active_trip_temp(struct acpi_device *adev, int id, int *ret_temp);
301 int thermal_acpi_passive_trip_temp(struct acpi_device *adev, int *ret_temp);
302 int thermal_acpi_hot_trip_temp(struct acpi_device *adev, int *ret_temp);
303 int thermal_acpi_critical_trip_temp(struct acpi_device *adev, int *ret_temp);
306 #ifdef CONFIG_THERMAL
307 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
308 void *, struct thermal_zone_device_ops *,
309 const struct thermal_zone_params *, int, int);
311 void thermal_zone_device_unregister(struct thermal_zone_device *);
313 struct thermal_zone_device *
314 thermal_zone_device_register_with_trips(const char *, struct thermal_trip *, int, int,
315 void *, struct thermal_zone_device_ops *,
316 const struct thermal_zone_params *, int, int);
318 void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
319 const char *thermal_zone_device_type(struct thermal_zone_device *tzd);
320 int thermal_zone_device_id(struct thermal_zone_device *tzd);
321 struct device *thermal_zone_device(struct thermal_zone_device *tzd);
323 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
324 struct thermal_cooling_device *,
325 unsigned long, unsigned long,
327 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
328 struct thermal_cooling_device *);
329 void thermal_zone_device_update(struct thermal_zone_device *,
330 enum thermal_notify_event);
331 void thermal_zone_device_exec(struct thermal_zone_device *tz,
332 void (*cb)(struct thermal_zone_device *,
336 struct thermal_cooling_device *thermal_cooling_device_register(const char *,
337 void *, const struct thermal_cooling_device_ops *);
338 struct thermal_cooling_device *
339 thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
340 const struct thermal_cooling_device_ops *);
341 struct thermal_cooling_device *
342 devm_thermal_of_cooling_device_register(struct device *dev,
343 struct device_node *np,
344 char *type, void *devdata,
345 const struct thermal_cooling_device_ops *ops);
346 void thermal_cooling_device_update(struct thermal_cooling_device *);
347 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
348 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
349 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
350 int thermal_zone_get_slope(struct thermal_zone_device *tz);
351 int thermal_zone_get_offset(struct thermal_zone_device *tz);
353 int thermal_zone_device_enable(struct thermal_zone_device *tz);
354 int thermal_zone_device_disable(struct thermal_zone_device *tz);
355 void thermal_zone_device_critical(struct thermal_zone_device *tz);
357 static inline struct thermal_zone_device *thermal_zone_device_register(
358 const char *type, int trips, int mask, void *devdata,
359 struct thermal_zone_device_ops *ops,
360 const struct thermal_zone_params *tzp,
361 int passive_delay, int polling_delay)
362 { return ERR_PTR(-ENODEV); }
363 static inline void thermal_zone_device_unregister(
364 struct thermal_zone_device *tz)
366 static inline struct thermal_cooling_device *
367 thermal_cooling_device_register(const char *type, void *devdata,
368 const struct thermal_cooling_device_ops *ops)
369 { return ERR_PTR(-ENODEV); }
370 static inline struct thermal_cooling_device *
371 thermal_of_cooling_device_register(struct device_node *np,
372 const char *type, void *devdata,
373 const struct thermal_cooling_device_ops *ops)
374 { return ERR_PTR(-ENODEV); }
375 static inline struct thermal_cooling_device *
376 devm_thermal_of_cooling_device_register(struct device *dev,
377 struct device_node *np,
378 char *type, void *devdata,
379 const struct thermal_cooling_device_ops *ops)
381 return ERR_PTR(-ENODEV);
383 static inline void thermal_cooling_device_unregister(
384 struct thermal_cooling_device *cdev)
386 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
388 { return ERR_PTR(-ENODEV); }
389 static inline int thermal_zone_get_temp(
390 struct thermal_zone_device *tz, int *temp)
392 static inline int thermal_zone_get_slope(
393 struct thermal_zone_device *tz)
395 static inline int thermal_zone_get_offset(
396 struct thermal_zone_device *tz)
399 static inline void *thermal_zone_device_priv(struct thermal_zone_device *tz)
404 static inline const char *thermal_zone_device_type(struct thermal_zone_device *tzd)
409 static inline int thermal_zone_device_id(struct thermal_zone_device *tzd)
414 static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
417 static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
419 #endif /* CONFIG_THERMAL */
421 #endif /* __THERMAL_H__ */