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
88 enum thermal_trip_type type;
91 struct thermal_cooling_device_ops {
92 int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
93 int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
94 int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
95 int (*get_requested_power)(struct thermal_cooling_device *, u32 *);
96 int (*state2power)(struct thermal_cooling_device *, unsigned long, u32 *);
97 int (*power2state)(struct thermal_cooling_device *, u32, unsigned long *);
100 struct thermal_cooling_device {
103 unsigned long max_state;
104 struct device device;
105 struct device_node *np;
108 const struct thermal_cooling_device_ops *ops;
109 bool updated; /* true if the cooling device does not need update */
110 struct mutex lock; /* protect thermal_instances list */
111 struct list_head thermal_instances;
112 struct list_head node;
116 * struct thermal_zone_device - structure for a thermal zone
117 * @id: unique id number for each thermal zone
118 * @type: the thermal zone device type
119 * @device: &struct device for this thermal zone
120 * @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
121 * @trip_type_attrs: attributes for trip points for sysfs: trip type
122 * @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
123 * @mode: current mode of this thermal zone
124 * @devdata: private pointer for device private data
125 * @trips: an array of struct thermal_trip
126 * @num_trips: number of trip points the thermal zone supports
127 * @trips_disabled; bitmap for disabled trips
128 * @passive_delay_jiffies: number of jiffies to wait between polls when
129 * performing passive cooling.
130 * @polling_delay_jiffies: number of jiffies to wait between polls when
131 * checking whether trip points have been crossed (0 for
132 * interrupt driven systems)
133 * @temperature: current temperature. This is only for core code,
134 * drivers should use thermal_zone_get_temp() to get the
135 * current temperature
136 * @last_temperature: previous temperature read
137 * @emul_temperature: emulated temperature when using CONFIG_THERMAL_EMULATION
138 * @passive: 1 if you've crossed a passive trip point, 0 otherwise.
139 * @prev_low_trip: the low current temperature if you've crossed a passive
141 * @prev_high_trip: the above current temperature if you've crossed a
143 * @need_update: if equals 1, thermal_zone_device_update needs to be invoked.
144 * @ops: operations this &thermal_zone_device supports
145 * @tzp: thermal zone parameters
146 * @governor: pointer to the governor for this thermal zone
147 * @governor_data: private pointer for governor data
148 * @thermal_instances: list of &struct thermal_instance of this thermal zone
149 * @ida: &struct ida to generate unique id for this zone's cooling
151 * @lock: lock to protect thermal_instances list
152 * @node: node in thermal_tz_list (in thermal_core.c)
153 * @poll_queue: delayed work for polling
154 * @notify_event: Last notification event
156 struct thermal_zone_device {
158 char type[THERMAL_NAME_LENGTH];
159 struct device device;
160 struct attribute_group trips_attribute_group;
161 struct thermal_attr *trip_temp_attrs;
162 struct thermal_attr *trip_type_attrs;
163 struct thermal_attr *trip_hyst_attrs;
164 enum thermal_device_mode mode;
166 struct thermal_trip *trips;
168 unsigned long trips_disabled; /* bitmap for disabled trips */
169 unsigned long passive_delay_jiffies;
170 unsigned long polling_delay_jiffies;
172 int last_temperature;
173 int emul_temperature;
177 atomic_t need_update;
178 struct thermal_zone_device_ops *ops;
179 struct thermal_zone_params *tzp;
180 struct thermal_governor *governor;
182 struct list_head thermal_instances;
185 struct list_head node;
186 struct delayed_work poll_queue;
187 enum thermal_notify_event notify_event;
191 * struct thermal_governor - structure that holds thermal governor information
192 * @name: name of the governor
193 * @bind_to_tz: callback called when binding to a thermal zone. If it
194 * returns 0, the governor is bound to the thermal zone,
195 * otherwise it fails.
196 * @unbind_from_tz: callback called when a governor is unbound from a
198 * @throttle: callback called for every trip point even if temperature is
199 * below the trip point temperature
200 * @governor_list: node in thermal_governor_list (in thermal_core.c)
202 struct thermal_governor {
203 char name[THERMAL_NAME_LENGTH];
204 int (*bind_to_tz)(struct thermal_zone_device *tz);
205 void (*unbind_from_tz)(struct thermal_zone_device *tz);
206 int (*throttle)(struct thermal_zone_device *tz, int trip);
207 struct list_head governor_list;
210 /* Structure to define Thermal Zone parameters */
211 struct thermal_zone_params {
212 char governor_name[THERMAL_NAME_LENGTH];
215 * a boolean to indicate if the thermal to hwmon sysfs interface
216 * is required. when no_hwmon == false, a hwmon sysfs interface
217 * will be created. when no_hwmon == true, nothing will be done
222 * Sustainable power (heat) that this thermal zone can dissipate in
225 u32 sustainable_power;
228 * Proportional parameter of the PID controller when
229 * overshooting (i.e., when temperature is below the target)
234 * Proportional parameter of the PID controller when
239 /* Integral parameter of the PID controller */
242 /* Derivative parameter of the PID controller */
245 /* threshold below which the error is no longer accumulated */
249 * @slope: slope of a linear temperature adjustment curve.
250 * Used by thermal zone drivers.
254 * @offset: offset of a linear temperature adjustment curve.
255 * Used by thermal zone drivers (default 0).
260 /* Function declarations */
261 #ifdef CONFIG_THERMAL_OF
262 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
263 const struct thermal_zone_device_ops *ops);
265 void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_device *tz);
270 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
271 const struct thermal_zone_device_ops *ops)
273 return ERR_PTR(-ENOTSUPP);
276 static inline void devm_thermal_of_zone_unregister(struct device *dev,
277 struct thermal_zone_device *tz)
282 int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
283 struct thermal_trip *trip);
284 int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
285 struct thermal_trip *trip);
287 int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id,
288 const struct thermal_trip *trip);
290 int thermal_zone_get_num_trips(struct thermal_zone_device *tz);
292 int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp);
294 #ifdef CONFIG_THERMAL_ACPI
295 int thermal_acpi_active_trip_temp(struct acpi_device *adev, int id, int *ret_temp);
296 int thermal_acpi_passive_trip_temp(struct acpi_device *adev, int *ret_temp);
297 int thermal_acpi_hot_trip_temp(struct acpi_device *adev, int *ret_temp);
298 int thermal_acpi_critical_trip_temp(struct acpi_device *adev, int *ret_temp);
301 #ifdef CONFIG_THERMAL
302 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
303 void *, struct thermal_zone_device_ops *,
304 struct thermal_zone_params *, int, int);
306 void thermal_zone_device_unregister(struct thermal_zone_device *);
308 struct thermal_zone_device *
309 thermal_zone_device_register_with_trips(const char *, struct thermal_trip *, int, int,
310 void *, struct thermal_zone_device_ops *,
311 struct thermal_zone_params *, int, int);
313 void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
314 const char *thermal_zone_device_type(struct thermal_zone_device *tzd);
315 int thermal_zone_device_id(struct thermal_zone_device *tzd);
316 struct device *thermal_zone_device(struct thermal_zone_device *tzd);
318 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
319 struct thermal_cooling_device *,
320 unsigned long, unsigned long,
322 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
323 struct thermal_cooling_device *);
324 void thermal_zone_device_update(struct thermal_zone_device *,
325 enum thermal_notify_event);
327 struct thermal_cooling_device *thermal_cooling_device_register(const char *,
328 void *, const struct thermal_cooling_device_ops *);
329 struct thermal_cooling_device *
330 thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
331 const struct thermal_cooling_device_ops *);
332 struct thermal_cooling_device *
333 devm_thermal_of_cooling_device_register(struct device *dev,
334 struct device_node *np,
335 char *type, void *devdata,
336 const struct thermal_cooling_device_ops *ops);
337 void thermal_cooling_device_update(struct thermal_cooling_device *);
338 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
339 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
340 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
341 int thermal_zone_get_slope(struct thermal_zone_device *tz);
342 int thermal_zone_get_offset(struct thermal_zone_device *tz);
344 int thermal_zone_device_enable(struct thermal_zone_device *tz);
345 int thermal_zone_device_disable(struct thermal_zone_device *tz);
346 void thermal_zone_device_critical(struct thermal_zone_device *tz);
348 static inline struct thermal_zone_device *thermal_zone_device_register(
349 const char *type, int trips, int mask, void *devdata,
350 struct thermal_zone_device_ops *ops,
351 struct thermal_zone_params *tzp,
352 int passive_delay, int polling_delay)
353 { return ERR_PTR(-ENODEV); }
354 static inline void thermal_zone_device_unregister(
355 struct thermal_zone_device *tz)
357 static inline struct thermal_cooling_device *
358 thermal_cooling_device_register(const char *type, void *devdata,
359 const struct thermal_cooling_device_ops *ops)
360 { return ERR_PTR(-ENODEV); }
361 static inline struct thermal_cooling_device *
362 thermal_of_cooling_device_register(struct device_node *np,
363 const char *type, void *devdata,
364 const struct thermal_cooling_device_ops *ops)
365 { return ERR_PTR(-ENODEV); }
366 static inline struct thermal_cooling_device *
367 devm_thermal_of_cooling_device_register(struct device *dev,
368 struct device_node *np,
369 char *type, void *devdata,
370 const struct thermal_cooling_device_ops *ops)
372 return ERR_PTR(-ENODEV);
374 static inline void thermal_cooling_device_unregister(
375 struct thermal_cooling_device *cdev)
377 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
379 { return ERR_PTR(-ENODEV); }
380 static inline int thermal_zone_get_temp(
381 struct thermal_zone_device *tz, int *temp)
383 static inline int thermal_zone_get_slope(
384 struct thermal_zone_device *tz)
386 static inline int thermal_zone_get_offset(
387 struct thermal_zone_device *tz)
390 static inline void *thermal_zone_device_priv(struct thermal_zone_device *tz)
395 static inline const char *thermal_zone_device_type(struct thermal_zone_device *tzd)
400 static inline int thermal_zone_device_id(struct thermal_zone_device *tzd)
405 static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
408 static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
410 #endif /* CONFIG_THERMAL */
412 #endif /* __THERMAL_H__ */