1 /* SPDX-License-Identifier: GPL-2.0 */
3 * thermal.h ($Revision: 0 $)
5 * Copyright (C) 2008 Intel Corp
6 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
7 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
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;
35 struct thermal_debugfs;
39 THERMAL_TREND_STABLE, /* temperature is stable */
40 THERMAL_TREND_RAISING, /* temperature is raising */
41 THERMAL_TREND_DROPPING, /* temperature is dropping */
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 THERMAL_TZ_RESUME, /* Thermal zone is resuming after system sleep */
59 THERMAL_TZ_ADD_THRESHOLD, /* Threshold added */
60 THERMAL_TZ_DEL_THRESHOLD, /* Threshold deleted */
61 THERMAL_TZ_FLUSH_THRESHOLDS, /* All thresholds deleted */
65 * struct thermal_trip - representation of a point in temperature domain
66 * @temperature: temperature value in miliCelsius
67 * @hysteresis: relative hysteresis in miliCelsius
68 * @type: trip point type
69 * @priv: pointer to driver data associated with this trip
70 * @flags: flags representing binary properties of the trip
75 enum thermal_trip_type type;
80 #define THERMAL_TRIP_FLAG_RW_TEMP BIT(0)
81 #define THERMAL_TRIP_FLAG_RW_HYST BIT(1)
83 #define THERMAL_TRIP_FLAG_RW (THERMAL_TRIP_FLAG_RW_TEMP | \
84 THERMAL_TRIP_FLAG_RW_HYST)
86 #define THERMAL_TRIP_PRIV_TO_INT(_val_) (uintptr_t)(_val_)
87 #define THERMAL_INT_TO_TRIP_PRIV(_val_) (void *)(uintptr_t)(_val_)
90 unsigned long upper; /* Highest cooling state */
91 unsigned long lower; /* Lowest cooling state */
92 unsigned int weight; /* Cooling device weight */
95 struct thermal_zone_device_ops {
96 bool (*should_bind) (struct thermal_zone_device *,
97 const struct thermal_trip *,
98 struct thermal_cooling_device *,
99 struct cooling_spec *);
100 int (*get_temp) (struct thermal_zone_device *, int *);
101 int (*set_trips) (struct thermal_zone_device *, int, int);
102 int (*change_mode) (struct thermal_zone_device *,
103 enum thermal_device_mode);
104 int (*set_trip_temp) (struct thermal_zone_device *,
105 const struct thermal_trip *, int);
106 int (*get_crit_temp) (struct thermal_zone_device *, int *);
107 int (*set_emul_temp) (struct thermal_zone_device *, int);
108 int (*get_trend) (struct thermal_zone_device *,
109 const struct thermal_trip *, enum thermal_trend *);
110 void (*hot)(struct thermal_zone_device *);
111 void (*critical)(struct thermal_zone_device *);
114 struct thermal_cooling_device_ops {
115 int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
116 int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
117 int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
118 int (*get_requested_power)(struct thermal_cooling_device *, u32 *);
119 int (*state2power)(struct thermal_cooling_device *, unsigned long, u32 *);
120 int (*power2state)(struct thermal_cooling_device *, u32, unsigned long *);
123 struct thermal_cooling_device {
126 unsigned long max_state;
127 struct device device;
128 struct device_node *np;
131 const struct thermal_cooling_device_ops *ops;
132 bool updated; /* true if the cooling device does not need update */
133 struct mutex lock; /* protect thermal_instances list */
134 struct list_head thermal_instances;
135 struct list_head node;
136 #ifdef CONFIG_THERMAL_DEBUGFS
137 struct thermal_debugfs *debugfs;
141 DEFINE_GUARD(cooling_dev, struct thermal_cooling_device *, mutex_lock(&_T->lock),
142 mutex_unlock(&_T->lock))
144 /* Structure to define Thermal Zone parameters */
145 struct thermal_zone_params {
146 const char *governor_name;
149 * a boolean to indicate if the thermal to hwmon sysfs interface
150 * is required. when no_hwmon == false, a hwmon sysfs interface
151 * will be created. when no_hwmon == true, nothing will be done
156 * Sustainable power (heat) that this thermal zone can dissipate in
159 u32 sustainable_power;
162 * Proportional parameter of the PID controller when
163 * overshooting (i.e., when temperature is below the target)
168 * Proportional parameter of the PID controller when
173 /* Integral parameter of the PID controller */
176 /* Derivative parameter of the PID controller */
179 /* threshold below which the error is no longer accumulated */
183 * @slope: slope of a linear temperature adjustment curve.
184 * Used by thermal zone drivers.
188 * @offset: offset of a linear temperature adjustment curve.
189 * Used by thermal zone drivers (default 0).
194 /* Function declarations */
195 #ifdef CONFIG_THERMAL_OF
196 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
197 const struct thermal_zone_device_ops *ops);
199 void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_device *tz);
204 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
205 const struct thermal_zone_device_ops *ops)
207 return ERR_PTR(-ENOTSUPP);
210 static inline void devm_thermal_of_zone_unregister(struct device *dev,
211 struct thermal_zone_device *tz)
216 int for_each_thermal_trip(struct thermal_zone_device *tz,
217 int (*cb)(struct thermal_trip *, void *),
219 int thermal_zone_for_each_trip(struct thermal_zone_device *tz,
220 int (*cb)(struct thermal_trip *, void *),
222 void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,
223 struct thermal_trip *trip, int temp);
225 int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp);
227 #ifdef CONFIG_THERMAL
228 struct thermal_zone_device *thermal_zone_device_register_with_trips(
230 const struct thermal_trip *trips,
231 int num_trips, void *devdata,
232 const struct thermal_zone_device_ops *ops,
233 const struct thermal_zone_params *tzp,
234 unsigned int passive_delay,
235 unsigned int polling_delay);
237 struct thermal_zone_device *thermal_tripless_zone_device_register(
240 const struct thermal_zone_device_ops *ops,
241 const struct thermal_zone_params *tzp);
243 void thermal_zone_device_unregister(struct thermal_zone_device *tz);
245 void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
246 const char *thermal_zone_device_type(struct thermal_zone_device *tzd);
247 int thermal_zone_device_id(struct thermal_zone_device *tzd);
248 struct device *thermal_zone_device(struct thermal_zone_device *tzd);
250 void thermal_zone_device_update(struct thermal_zone_device *,
251 enum thermal_notify_event);
253 struct thermal_cooling_device *thermal_cooling_device_register(const char *,
254 void *, const struct thermal_cooling_device_ops *);
255 struct thermal_cooling_device *
256 thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
257 const struct thermal_cooling_device_ops *);
258 struct thermal_cooling_device *
259 devm_thermal_of_cooling_device_register(struct device *dev,
260 struct device_node *np,
261 const char *type, void *devdata,
262 const struct thermal_cooling_device_ops *ops);
263 void thermal_cooling_device_update(struct thermal_cooling_device *);
264 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
265 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
266 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
267 int thermal_zone_get_slope(struct thermal_zone_device *tz);
268 int thermal_zone_get_offset(struct thermal_zone_device *tz);
269 bool thermal_trip_is_bound_to_cdev(struct thermal_zone_device *tz,
270 const struct thermal_trip *trip,
271 struct thermal_cooling_device *cdev);
273 int thermal_zone_device_enable(struct thermal_zone_device *tz);
274 int thermal_zone_device_disable(struct thermal_zone_device *tz);
275 void thermal_zone_device_critical(struct thermal_zone_device *tz);
277 static inline struct thermal_zone_device *thermal_zone_device_register_with_trips(
279 const struct thermal_trip *trips,
280 int num_trips, void *devdata,
281 const struct thermal_zone_device_ops *ops,
282 const struct thermal_zone_params *tzp,
283 int passive_delay, int polling_delay)
284 { return ERR_PTR(-ENODEV); }
286 static inline struct thermal_zone_device *thermal_tripless_zone_device_register(
289 struct thermal_zone_device_ops *ops,
290 const struct thermal_zone_params *tzp)
291 { return ERR_PTR(-ENODEV); }
293 static inline void thermal_zone_device_unregister(struct thermal_zone_device *tz)
296 static inline void thermal_zone_device_update(struct thermal_zone_device *tz,
297 enum thermal_notify_event event)
300 static inline struct thermal_cooling_device *
301 thermal_cooling_device_register(const char *type, void *devdata,
302 const struct thermal_cooling_device_ops *ops)
303 { return ERR_PTR(-ENODEV); }
304 static inline struct thermal_cooling_device *
305 thermal_of_cooling_device_register(struct device_node *np,
306 const char *type, void *devdata,
307 const struct thermal_cooling_device_ops *ops)
308 { return ERR_PTR(-ENODEV); }
309 static inline struct thermal_cooling_device *
310 devm_thermal_of_cooling_device_register(struct device *dev,
311 struct device_node *np,
312 const char *type, void *devdata,
313 const struct thermal_cooling_device_ops *ops)
315 return ERR_PTR(-ENODEV);
317 static inline void thermal_cooling_device_unregister(
318 struct thermal_cooling_device *cdev)
320 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
322 { return ERR_PTR(-ENODEV); }
323 static inline int thermal_zone_get_temp(
324 struct thermal_zone_device *tz, int *temp)
326 static inline int thermal_zone_get_slope(
327 struct thermal_zone_device *tz)
329 static inline int thermal_zone_get_offset(
330 struct thermal_zone_device *tz)
333 static inline void *thermal_zone_device_priv(struct thermal_zone_device *tz)
338 static inline const char *thermal_zone_device_type(struct thermal_zone_device *tzd)
343 static inline int thermal_zone_device_id(struct thermal_zone_device *tzd)
348 static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
351 static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
353 #endif /* CONFIG_THERMAL */
355 #endif /* __THERMAL_H__ */