]> Git Repo - linux.git/blob - include/linux/thermal.h
Merge patch series "Add ACPI NUMA support for RISC-V"
[linux.git] / include / linux / thermal.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  *  thermal.h  ($Revision: 0 $)
4  *
5  *  Copyright (C) 2008  Intel Corp
6  *  Copyright (C) 2008  Zhang Rui <[email protected]>
7  *  Copyright (C) 2008  Sujith Thomas <[email protected]>
8  */
9
10 #ifndef __THERMAL_H__
11 #define __THERMAL_H__
12
13 #include <linux/of.h>
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>
19
20 /* invalid cooling state */
21 #define THERMAL_CSTATE_INVALID -1UL
22
23 /* No upper/lower limit requirement */
24 #define THERMAL_NO_LIMIT        ((u32)~0)
25
26 /* Default weight of a bound cooling device */
27 #define THERMAL_WEIGHT_DEFAULT 0
28
29 /* use value, which < 0K, to indicate an invalid/uninitialized temperature */
30 #define THERMAL_TEMP_INVALID    -274000
31
32 struct thermal_zone_device;
33 struct thermal_cooling_device;
34 struct thermal_instance;
35 struct thermal_debugfs;
36 struct thermal_attr;
37
38 enum thermal_trend {
39         THERMAL_TREND_STABLE, /* temperature is stable */
40         THERMAL_TREND_RAISING, /* temperature is raising */
41         THERMAL_TREND_DROPPING, /* temperature is dropping */
42 };
43
44 /* Thermal notification reason */
45 enum thermal_notify_event {
46         THERMAL_EVENT_UNSPECIFIED, /* Unspecified event */
47         THERMAL_EVENT_TEMP_SAMPLE, /* New Temperature sample */
48         THERMAL_TRIP_VIOLATED, /* TRIP Point violation */
49         THERMAL_TRIP_CHANGED, /* TRIP Point temperature changed */
50         THERMAL_DEVICE_DOWN, /* Thermal device is down */
51         THERMAL_DEVICE_UP, /* Thermal device is up after a down event */
52         THERMAL_DEVICE_POWER_CAPABILITY_CHANGED, /* power capability changed */
53         THERMAL_TABLE_CHANGED, /* Thermal table(s) changed */
54         THERMAL_EVENT_KEEP_ALIVE, /* Request for user space handler to respond */
55         THERMAL_TZ_BIND_CDEV, /* Cooling dev is bind to the thermal zone */
56         THERMAL_TZ_UNBIND_CDEV, /* Cooling dev is unbind from the thermal zone */
57         THERMAL_INSTANCE_WEIGHT_CHANGED, /* Thermal instance weight changed */
58 };
59
60 /**
61  * struct thermal_trip - representation of a point in temperature domain
62  * @temperature: temperature value in miliCelsius
63  * @hysteresis: relative hysteresis in miliCelsius
64  * @type: trip point type
65  * @priv: pointer to driver data associated with this trip
66  * @flags: flags representing binary properties of the trip
67  */
68 struct thermal_trip {
69         int temperature;
70         int hysteresis;
71         enum thermal_trip_type type;
72         u8 flags;
73         void *priv;
74 };
75
76 #define THERMAL_TRIP_FLAG_RW_TEMP       BIT(0)
77 #define THERMAL_TRIP_FLAG_RW_HYST       BIT(1)
78
79 #define THERMAL_TRIP_FLAG_RW    (THERMAL_TRIP_FLAG_RW_TEMP | \
80                                  THERMAL_TRIP_FLAG_RW_HYST)
81
82 #define THERMAL_TRIP_PRIV_TO_INT(_val_) (uintptr_t)(_val_)
83 #define THERMAL_INT_TO_TRIP_PRIV(_val_) (void *)(uintptr_t)(_val_)
84
85 struct thermal_zone_device;
86
87 struct thermal_zone_device_ops {
88         int (*bind) (struct thermal_zone_device *,
89                      struct thermal_cooling_device *);
90         int (*unbind) (struct thermal_zone_device *,
91                        struct thermal_cooling_device *);
92         int (*get_temp) (struct thermal_zone_device *, int *);
93         int (*set_trips) (struct thermal_zone_device *, int, int);
94         int (*change_mode) (struct thermal_zone_device *,
95                 enum thermal_device_mode);
96         int (*set_trip_temp) (struct thermal_zone_device *,
97                               const struct thermal_trip *, int);
98         int (*get_crit_temp) (struct thermal_zone_device *, int *);
99         int (*set_emul_temp) (struct thermal_zone_device *, int);
100         int (*get_trend) (struct thermal_zone_device *,
101                           const struct thermal_trip *, enum thermal_trend *);
102         void (*hot)(struct thermal_zone_device *);
103         void (*critical)(struct thermal_zone_device *);
104 };
105
106 struct thermal_cooling_device_ops {
107         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
108         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
109         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
110         int (*get_requested_power)(struct thermal_cooling_device *, u32 *);
111         int (*state2power)(struct thermal_cooling_device *, unsigned long, u32 *);
112         int (*power2state)(struct thermal_cooling_device *, u32, unsigned long *);
113 };
114
115 struct thermal_cooling_device {
116         int id;
117         const char *type;
118         unsigned long max_state;
119         struct device device;
120         struct device_node *np;
121         void *devdata;
122         void *stats;
123         const struct thermal_cooling_device_ops *ops;
124         bool updated; /* true if the cooling device does not need update */
125         struct mutex lock; /* protect thermal_instances list */
126         struct list_head thermal_instances;
127         struct list_head node;
128 #ifdef CONFIG_THERMAL_DEBUGFS
129         struct thermal_debugfs *debugfs;
130 #endif
131 };
132
133 /* Structure to define Thermal Zone parameters */
134 struct thermal_zone_params {
135         const char *governor_name;
136
137         /*
138          * a boolean to indicate if the thermal to hwmon sysfs interface
139          * is required. when no_hwmon == false, a hwmon sysfs interface
140          * will be created. when no_hwmon == true, nothing will be done
141          */
142         bool no_hwmon;
143
144         /*
145          * Sustainable power (heat) that this thermal zone can dissipate in
146          * mW
147          */
148         u32 sustainable_power;
149
150         /*
151          * Proportional parameter of the PID controller when
152          * overshooting (i.e., when temperature is below the target)
153          */
154         s32 k_po;
155
156         /*
157          * Proportional parameter of the PID controller when
158          * undershooting
159          */
160         s32 k_pu;
161
162         /* Integral parameter of the PID controller */
163         s32 k_i;
164
165         /* Derivative parameter of the PID controller */
166         s32 k_d;
167
168         /* threshold below which the error is no longer accumulated */
169         s32 integral_cutoff;
170
171         /*
172          * @slope:      slope of a linear temperature adjustment curve.
173          *              Used by thermal zone drivers.
174          */
175         int slope;
176         /*
177          * @offset:     offset of a linear temperature adjustment curve.
178          *              Used by thermal zone drivers (default 0).
179          */
180         int offset;
181 };
182
183 /* Function declarations */
184 #ifdef CONFIG_THERMAL_OF
185 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
186                                                           const struct thermal_zone_device_ops *ops);
187
188 void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_device *tz);
189
190 #else
191
192 static inline
193 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
194                                                           const struct thermal_zone_device_ops *ops)
195 {
196         return ERR_PTR(-ENOTSUPP);
197 }
198
199 static inline void devm_thermal_of_zone_unregister(struct device *dev,
200                                                    struct thermal_zone_device *tz)
201 {
202 }
203 #endif
204
205 int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
206                           struct thermal_trip *trip);
207 int for_each_thermal_trip(struct thermal_zone_device *tz,
208                           int (*cb)(struct thermal_trip *, void *),
209                           void *data);
210 int thermal_zone_for_each_trip(struct thermal_zone_device *tz,
211                                int (*cb)(struct thermal_trip *, void *),
212                                void *data);
213 int thermal_zone_get_num_trips(struct thermal_zone_device *tz);
214 void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,
215                                 struct thermal_trip *trip, int temp);
216
217 int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp);
218
219 #ifdef CONFIG_THERMAL
220 struct thermal_zone_device *thermal_zone_device_register_with_trips(
221                                         const char *type,
222                                         const struct thermal_trip *trips,
223                                         int num_trips, void *devdata,
224                                         const struct thermal_zone_device_ops *ops,
225                                         const struct thermal_zone_params *tzp,
226                                         unsigned int passive_delay,
227                                         unsigned int polling_delay);
228
229 struct thermal_zone_device *thermal_tripless_zone_device_register(
230                                         const char *type,
231                                         void *devdata,
232                                         const struct thermal_zone_device_ops *ops,
233                                         const struct thermal_zone_params *tzp);
234
235 void thermal_zone_device_unregister(struct thermal_zone_device *tz);
236
237 void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
238 const char *thermal_zone_device_type(struct thermal_zone_device *tzd);
239 int thermal_zone_device_id(struct thermal_zone_device *tzd);
240 struct device *thermal_zone_device(struct thermal_zone_device *tzd);
241
242 int thermal_bind_cdev_to_trip(struct thermal_zone_device *tz,
243                               const struct thermal_trip *trip,
244                               struct thermal_cooling_device *cdev,
245                               unsigned long upper, unsigned long lower,
246                               unsigned int weight);
247 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
248                                      struct thermal_cooling_device *,
249                                      unsigned long, unsigned long,
250                                      unsigned int);
251 int thermal_unbind_cdev_from_trip(struct thermal_zone_device *tz,
252                                   const struct thermal_trip *trip,
253                                   struct thermal_cooling_device *cdev);
254 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
255                                        struct thermal_cooling_device *);
256 void thermal_zone_device_update(struct thermal_zone_device *,
257                                 enum thermal_notify_event);
258
259 struct thermal_cooling_device *thermal_cooling_device_register(const char *,
260                 void *, const struct thermal_cooling_device_ops *);
261 struct thermal_cooling_device *
262 thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
263                                    const struct thermal_cooling_device_ops *);
264 struct thermal_cooling_device *
265 devm_thermal_of_cooling_device_register(struct device *dev,
266                                 struct device_node *np,
267                                 const char *type, void *devdata,
268                                 const struct thermal_cooling_device_ops *ops);
269 void thermal_cooling_device_update(struct thermal_cooling_device *);
270 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
271 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
272 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
273 int thermal_zone_get_slope(struct thermal_zone_device *tz);
274 int thermal_zone_get_offset(struct thermal_zone_device *tz);
275 bool thermal_trip_is_bound_to_cdev(struct thermal_zone_device *tz,
276                                    const struct thermal_trip *trip,
277                                    struct thermal_cooling_device *cdev);
278
279 int thermal_zone_device_enable(struct thermal_zone_device *tz);
280 int thermal_zone_device_disable(struct thermal_zone_device *tz);
281 void thermal_zone_device_critical(struct thermal_zone_device *tz);
282 #else
283 static inline struct thermal_zone_device *thermal_zone_device_register_with_trips(
284                                         const char *type,
285                                         const struct thermal_trip *trips,
286                                         int num_trips, void *devdata,
287                                         const struct thermal_zone_device_ops *ops,
288                                         const struct thermal_zone_params *tzp,
289                                         int passive_delay, int polling_delay)
290 { return ERR_PTR(-ENODEV); }
291
292 static inline struct thermal_zone_device *thermal_tripless_zone_device_register(
293                                         const char *type,
294                                         void *devdata,
295                                         struct thermal_zone_device_ops *ops,
296                                         const struct thermal_zone_params *tzp)
297 { return ERR_PTR(-ENODEV); }
298
299 static inline void thermal_zone_device_unregister(struct thermal_zone_device *tz)
300 { }
301
302 static inline struct thermal_cooling_device *
303 thermal_cooling_device_register(const char *type, void *devdata,
304         const struct thermal_cooling_device_ops *ops)
305 { return ERR_PTR(-ENODEV); }
306 static inline struct thermal_cooling_device *
307 thermal_of_cooling_device_register(struct device_node *np,
308         const char *type, void *devdata,
309         const struct thermal_cooling_device_ops *ops)
310 { return ERR_PTR(-ENODEV); }
311 static inline struct thermal_cooling_device *
312 devm_thermal_of_cooling_device_register(struct device *dev,
313                                 struct device_node *np,
314                                 const char *type, void *devdata,
315                                 const struct thermal_cooling_device_ops *ops)
316 {
317         return ERR_PTR(-ENODEV);
318 }
319 static inline void thermal_cooling_device_unregister(
320         struct thermal_cooling_device *cdev)
321 { }
322 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
323                 const char *name)
324 { return ERR_PTR(-ENODEV); }
325 static inline int thermal_zone_get_temp(
326                 struct thermal_zone_device *tz, int *temp)
327 { return -ENODEV; }
328 static inline int thermal_zone_get_slope(
329                 struct thermal_zone_device *tz)
330 { return -ENODEV; }
331 static inline int thermal_zone_get_offset(
332                 struct thermal_zone_device *tz)
333 { return -ENODEV; }
334
335 static inline void *thermal_zone_device_priv(struct thermal_zone_device *tz)
336 {
337         return NULL;
338 }
339
340 static inline const char *thermal_zone_device_type(struct thermal_zone_device *tzd)
341 {
342         return NULL;
343 }
344
345 static inline int thermal_zone_device_id(struct thermal_zone_device *tzd)
346 {
347         return -ENODEV;
348 }
349
350 static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
351 { return -ENODEV; }
352
353 static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
354 { return -ENODEV; }
355 #endif /* CONFIG_THERMAL */
356
357 #endif /* __THERMAL_H__ */
This page took 0.063827 seconds and 4 git commands to generate.