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 #define THERMAL_TRIPS_NONE -1
21 #define THERMAL_MAX_TRIPS 12
23 /* invalid cooling state */
24 #define THERMAL_CSTATE_INVALID -1UL
26 /* No upper/lower limit requirement */
27 #define THERMAL_NO_LIMIT ((u32)~0)
29 /* Default weight of a bound cooling device */
30 #define THERMAL_WEIGHT_DEFAULT 0
32 /* use value, which < 0K, to indicate an invalid/uninitialized temperature */
33 #define THERMAL_TEMP_INVALID -274000
35 struct thermal_zone_device;
36 struct thermal_cooling_device;
37 struct thermal_instance;
41 THERMAL_TREND_STABLE, /* temperature is stable */
42 THERMAL_TREND_RAISING, /* temperature is raising */
43 THERMAL_TREND_DROPPING, /* temperature is dropping */
44 THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
45 THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
48 /* Thermal notification reason */
49 enum thermal_notify_event {
50 THERMAL_EVENT_UNSPECIFIED, /* Unspecified event */
51 THERMAL_EVENT_TEMP_SAMPLE, /* New Temperature sample */
52 THERMAL_TRIP_VIOLATED, /* TRIP Point violation */
53 THERMAL_TRIP_CHANGED, /* TRIP Point temperature changed */
54 THERMAL_DEVICE_DOWN, /* Thermal device is down */
55 THERMAL_DEVICE_UP, /* Thermal device is up after a down event */
56 THERMAL_DEVICE_POWER_CAPABILITY_CHANGED, /* power capability changed */
57 THERMAL_TABLE_CHANGED, /* Thermal table(s) changed */
58 THERMAL_EVENT_KEEP_ALIVE, /* Request for user space handler to respond */
61 struct thermal_zone_device_ops {
62 int (*bind) (struct thermal_zone_device *,
63 struct thermal_cooling_device *);
64 int (*unbind) (struct thermal_zone_device *,
65 struct thermal_cooling_device *);
66 int (*get_temp) (struct thermal_zone_device *, int *);
67 int (*set_trips) (struct thermal_zone_device *, int, int);
68 int (*change_mode) (struct thermal_zone_device *,
69 enum thermal_device_mode);
70 int (*get_trip_type) (struct thermal_zone_device *, int,
71 enum thermal_trip_type *);
72 int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
73 int (*set_trip_temp) (struct thermal_zone_device *, int, int);
74 int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
75 int (*set_trip_hyst) (struct thermal_zone_device *, int, int);
76 int (*get_crit_temp) (struct thermal_zone_device *, int *);
77 int (*set_emul_temp) (struct thermal_zone_device *, int);
78 int (*get_trend) (struct thermal_zone_device *, int,
79 enum thermal_trend *);
80 int (*notify) (struct thermal_zone_device *, int,
81 enum thermal_trip_type);
82 void (*hot)(struct thermal_zone_device *);
83 void (*critical)(struct thermal_zone_device *);
86 struct thermal_cooling_device_ops {
87 int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
88 int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
89 int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
90 int (*get_requested_power)(struct thermal_cooling_device *, u32 *);
91 int (*state2power)(struct thermal_cooling_device *, unsigned long, u32 *);
92 int (*power2state)(struct thermal_cooling_device *, u32, unsigned long *);
95 struct thermal_cooling_device {
97 char type[THERMAL_NAME_LENGTH];
99 struct device_node *np;
102 const struct thermal_cooling_device_ops *ops;
103 bool updated; /* true if the cooling device does not need update */
104 struct mutex lock; /* protect thermal_instances list */
105 struct list_head thermal_instances;
106 struct list_head node;
110 * struct thermal_zone_device - structure for a thermal zone
111 * @id: unique id number for each thermal zone
112 * @type: the thermal zone device type
113 * @device: &struct device for this thermal zone
114 * @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
115 * @trip_type_attrs: attributes for trip points for sysfs: trip type
116 * @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
117 * @mode: current mode of this thermal zone
118 * @devdata: private pointer for device private data
119 * @trips: number of trip points the thermal zone supports
120 * @trips_disabled; bitmap for disabled trips
121 * @passive_delay: number of milliseconds to wait between polls when
122 * performing passive cooling.
123 * @polling_delay: number of milliseconds to wait between polls when
124 * checking whether trip points have been crossed (0 for
125 * interrupt driven systems)
126 * @temperature: current temperature. This is only for core code,
127 * drivers should use thermal_zone_get_temp() to get the
128 * current temperature
129 * @last_temperature: previous temperature read
130 * @emul_temperature: emulated temperature when using CONFIG_THERMAL_EMULATION
131 * @passive: 1 if you've crossed a passive trip point, 0 otherwise.
132 * @prev_low_trip: the low current temperature if you've crossed a passive
134 * @prev_high_trip: the above current temperature if you've crossed a
136 * @forced_passive: If > 0, temperature at which to switch on all ACPI
137 * processor cooling devices. Currently only used by the
138 * step-wise governor.
139 * @need_update: if equals 1, thermal_zone_device_update needs to be invoked.
140 * @ops: operations this &thermal_zone_device supports
141 * @tzp: thermal zone parameters
142 * @governor: pointer to the governor for this thermal zone
143 * @governor_data: private pointer for governor data
144 * @thermal_instances: list of &struct thermal_instance of this thermal zone
145 * @ida: &struct ida to generate unique id for this zone's cooling
147 * @lock: lock to protect thermal_instances list
148 * @node: node in thermal_tz_list (in thermal_core.c)
149 * @poll_queue: delayed work for polling
150 * @notify_event: Last notification event
152 struct thermal_zone_device {
154 char type[THERMAL_NAME_LENGTH];
155 struct device device;
156 struct attribute_group trips_attribute_group;
157 struct thermal_attr *trip_temp_attrs;
158 struct thermal_attr *trip_type_attrs;
159 struct thermal_attr *trip_hyst_attrs;
160 enum thermal_device_mode mode;
163 unsigned long trips_disabled; /* bitmap for disabled trips */
167 int last_temperature;
168 int emul_temperature;
172 unsigned int forced_passive;
173 atomic_t need_update;
174 struct thermal_zone_device_ops *ops;
175 struct thermal_zone_params *tzp;
176 struct thermal_governor *governor;
178 struct list_head thermal_instances;
181 struct list_head node;
182 struct delayed_work poll_queue;
183 enum thermal_notify_event notify_event;
187 * struct thermal_governor - structure that holds thermal governor information
188 * @name: name of the governor
189 * @bind_to_tz: callback called when binding to a thermal zone. If it
190 * returns 0, the governor is bound to the thermal zone,
191 * otherwise it fails.
192 * @unbind_from_tz: callback called when a governor is unbound from a
194 * @throttle: callback called for every trip point even if temperature is
195 * below the trip point temperature
196 * @governor_list: node in thermal_governor_list (in thermal_core.c)
198 struct thermal_governor {
199 char name[THERMAL_NAME_LENGTH];
200 int (*bind_to_tz)(struct thermal_zone_device *tz);
201 void (*unbind_from_tz)(struct thermal_zone_device *tz);
202 int (*throttle)(struct thermal_zone_device *tz, int trip);
203 struct list_head governor_list;
206 /* Structure that holds binding parameters for a zone */
207 struct thermal_bind_params {
208 struct thermal_cooling_device *cdev;
211 * This is a measure of 'how effectively these devices can
212 * cool 'this' thermal zone. It shall be determined by
213 * platform characterization. This value is relative to the
214 * rest of the weights so a cooling device whose weight is
215 * double that of another cooling device is twice as
216 * effective. See Documentation/driver-api/thermal/sysfs-api.rst for more
222 * This is a bit mask that gives the binding relation between this
223 * thermal zone and cdev, for a particular trip point.
224 * See Documentation/driver-api/thermal/sysfs-api.rst for more information.
229 * This is an array of cooling state limits. Must have exactly
230 * 2 * thermal_zone.number_of_trip_points. It is an array consisting
231 * of tuples <lower-state upper-state> of state limits. Each trip
232 * will be associated with one state limit tuple when binding.
233 * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
236 unsigned long *binding_limits;
237 int (*match) (struct thermal_zone_device *tz,
238 struct thermal_cooling_device *cdev);
241 /* Structure to define Thermal Zone parameters */
242 struct thermal_zone_params {
243 char governor_name[THERMAL_NAME_LENGTH];
246 * a boolean to indicate if the thermal to hwmon sysfs interface
247 * is required. when no_hwmon == false, a hwmon sysfs interface
248 * will be created. when no_hwmon == true, nothing will be done
252 int num_tbps; /* Number of tbp entries */
253 struct thermal_bind_params *tbp;
256 * Sustainable power (heat) that this thermal zone can dissipate in
259 u32 sustainable_power;
262 * Proportional parameter of the PID controller when
263 * overshooting (i.e., when temperature is below the target)
268 * Proportional parameter of the PID controller when
273 /* Integral parameter of the PID controller */
276 /* Derivative parameter of the PID controller */
279 /* threshold below which the error is no longer accumulated */
283 * @slope: slope of a linear temperature adjustment curve.
284 * Used by thermal zone drivers.
288 * @offset: offset of a linear temperature adjustment curve.
289 * Used by thermal zone drivers (default 0).
295 * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
298 * @get_temp: a pointer to a function that reads the sensor temperature.
301 * @get_trend: a pointer to a function that reads the sensor temperature trend.
302 * @set_trips: a pointer to a function that sets a temperature window. When
303 * this window is left the driver must inform the thermal core via
304 * thermal_zone_device_update.
305 * @set_emul_temp: a pointer to a function that sets sensor emulated
307 * @set_trip_temp: a pointer to a function that sets the trip temperature on
310 struct thermal_zone_of_device_ops {
311 int (*get_temp)(void *, int *);
312 int (*get_trend)(void *, int, enum thermal_trend *);
313 int (*set_trips)(void *, int, int);
314 int (*set_emul_temp)(void *, int);
315 int (*set_trip_temp)(void *, int, int);
318 /* Function declarations */
319 #ifdef CONFIG_THERMAL_OF
320 int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
321 struct device_node *sensor_np,
323 struct thermal_zone_device *
324 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
325 const struct thermal_zone_of_device_ops *ops);
326 void thermal_zone_of_sensor_unregister(struct device *dev,
327 struct thermal_zone_device *tz);
328 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
329 struct device *dev, int id, void *data,
330 const struct thermal_zone_of_device_ops *ops);
331 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
332 struct thermal_zone_device *tz);
335 static inline int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
336 struct device_node *sensor_np,
341 static inline struct thermal_zone_device *
342 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
343 const struct thermal_zone_of_device_ops *ops)
345 return ERR_PTR(-ENODEV);
349 void thermal_zone_of_sensor_unregister(struct device *dev,
350 struct thermal_zone_device *tz)
354 static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
355 struct device *dev, int id, void *data,
356 const struct thermal_zone_of_device_ops *ops)
358 return ERR_PTR(-ENODEV);
362 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
363 struct thermal_zone_device *tz)
369 #ifdef CONFIG_THERMAL
370 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
371 void *, struct thermal_zone_device_ops *,
372 struct thermal_zone_params *, int, int);
373 void thermal_zone_device_unregister(struct thermal_zone_device *);
375 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
376 struct thermal_cooling_device *,
377 unsigned long, unsigned long,
379 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
380 struct thermal_cooling_device *);
381 void thermal_zone_device_update(struct thermal_zone_device *,
382 enum thermal_notify_event);
384 struct thermal_cooling_device *thermal_cooling_device_register(const char *,
385 void *, const struct thermal_cooling_device_ops *);
386 struct thermal_cooling_device *
387 thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
388 const struct thermal_cooling_device_ops *);
389 struct thermal_cooling_device *
390 devm_thermal_of_cooling_device_register(struct device *dev,
391 struct device_node *np,
392 char *type, void *devdata,
393 const struct thermal_cooling_device_ops *ops);
394 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
395 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
396 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
397 int thermal_zone_get_slope(struct thermal_zone_device *tz);
398 int thermal_zone_get_offset(struct thermal_zone_device *tz);
400 void thermal_cdev_update(struct thermal_cooling_device *);
401 void thermal_notify_framework(struct thermal_zone_device *, int);
402 int thermal_zone_device_enable(struct thermal_zone_device *tz);
403 int thermal_zone_device_disable(struct thermal_zone_device *tz);
404 void thermal_zone_device_critical(struct thermal_zone_device *tz);
406 static inline struct thermal_zone_device *thermal_zone_device_register(
407 const char *type, int trips, int mask, void *devdata,
408 struct thermal_zone_device_ops *ops,
409 struct thermal_zone_params *tzp,
410 int passive_delay, int polling_delay)
411 { return ERR_PTR(-ENODEV); }
412 static inline void thermal_zone_device_unregister(
413 struct thermal_zone_device *tz)
415 static inline struct thermal_cooling_device *
416 thermal_cooling_device_register(char *type, void *devdata,
417 const struct thermal_cooling_device_ops *ops)
418 { return ERR_PTR(-ENODEV); }
419 static inline struct thermal_cooling_device *
420 thermal_of_cooling_device_register(struct device_node *np,
421 char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
422 { return ERR_PTR(-ENODEV); }
423 static inline struct thermal_cooling_device *
424 devm_thermal_of_cooling_device_register(struct device *dev,
425 struct device_node *np,
426 char *type, void *devdata,
427 const struct thermal_cooling_device_ops *ops)
429 return ERR_PTR(-ENODEV);
431 static inline void thermal_cooling_device_unregister(
432 struct thermal_cooling_device *cdev)
434 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
436 { return ERR_PTR(-ENODEV); }
437 static inline int thermal_zone_get_temp(
438 struct thermal_zone_device *tz, int *temp)
440 static inline int thermal_zone_get_slope(
441 struct thermal_zone_device *tz)
443 static inline int thermal_zone_get_offset(
444 struct thermal_zone_device *tz)
447 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
449 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
453 static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
456 static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
458 #endif /* CONFIG_THERMAL */
460 #endif /* __THERMAL_H__ */