2 * thermal.h ($Revision: 0 $)
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29 #include <linux/idr.h>
30 #include <linux/device.h>
31 #include <linux/workqueue.h>
32 #include <uapi/linux/thermal.h>
34 #define THERMAL_TRIPS_NONE -1
35 #define THERMAL_MAX_TRIPS 12
37 /* invalid cooling state */
38 #define THERMAL_CSTATE_INVALID -1UL
40 /* No upper/lower limit requirement */
41 #define THERMAL_NO_LIMIT ((u32)~0)
43 /* Default weight of a bound cooling device */
44 #define THERMAL_WEIGHT_DEFAULT 0
46 /* use value, which < 0K, to indicate an invalid/uninitialized temperature */
47 #define THERMAL_TEMP_INVALID -274000
49 /* Unit conversion macros */
50 #define DECI_KELVIN_TO_CELSIUS(t) ({ \
52 ((_t-2732 >= 0) ? (_t-2732+5)/10 : (_t-2732-5)/10); \
54 #define CELSIUS_TO_DECI_KELVIN(t) ((t)*10+2732)
55 #define DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, off) (((t) - (off)) * 100)
56 #define DECI_KELVIN_TO_MILLICELSIUS(t) DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, 2732)
57 #define MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, off) (((t) / 100) + (off))
58 #define MILLICELSIUS_TO_DECI_KELVIN(t) MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, 2732)
60 /* Default Thermal Governor */
61 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
62 #define DEFAULT_THERMAL_GOVERNOR "step_wise"
63 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
64 #define DEFAULT_THERMAL_GOVERNOR "fair_share"
65 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
66 #define DEFAULT_THERMAL_GOVERNOR "user_space"
67 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR)
68 #define DEFAULT_THERMAL_GOVERNOR "power_allocator"
71 struct thermal_zone_device;
72 struct thermal_cooling_device;
73 struct thermal_instance;
75 enum thermal_device_mode {
76 THERMAL_DEVICE_DISABLED = 0,
77 THERMAL_DEVICE_ENABLED,
80 enum thermal_trip_type {
81 THERMAL_TRIP_ACTIVE = 0,
84 THERMAL_TRIP_CRITICAL,
88 THERMAL_TREND_STABLE, /* temperature is stable */
89 THERMAL_TREND_RAISING, /* temperature is raising */
90 THERMAL_TREND_DROPPING, /* temperature is dropping */
91 THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
92 THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
95 struct thermal_zone_device_ops {
96 int (*bind) (struct thermal_zone_device *,
97 struct thermal_cooling_device *);
98 int (*unbind) (struct thermal_zone_device *,
99 struct thermal_cooling_device *);
100 int (*get_temp) (struct thermal_zone_device *, int *);
101 int (*get_mode) (struct thermal_zone_device *,
102 enum thermal_device_mode *);
103 int (*set_mode) (struct thermal_zone_device *,
104 enum thermal_device_mode);
105 int (*get_trip_type) (struct thermal_zone_device *, int,
106 enum thermal_trip_type *);
107 int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
108 int (*set_trip_temp) (struct thermal_zone_device *, int, int);
109 int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
110 int (*set_trip_hyst) (struct thermal_zone_device *, int, int);
111 int (*get_crit_temp) (struct thermal_zone_device *, int *);
112 int (*set_emul_temp) (struct thermal_zone_device *, int);
113 int (*get_trend) (struct thermal_zone_device *, int,
114 enum thermal_trend *);
115 int (*notify) (struct thermal_zone_device *, int,
116 enum thermal_trip_type);
119 struct thermal_cooling_device_ops {
120 int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
121 int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
122 int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
123 int (*get_requested_power)(struct thermal_cooling_device *,
124 struct thermal_zone_device *, u32 *);
125 int (*state2power)(struct thermal_cooling_device *,
126 struct thermal_zone_device *, unsigned long, u32 *);
127 int (*power2state)(struct thermal_cooling_device *,
128 struct thermal_zone_device *, u32, unsigned long *);
131 struct thermal_cooling_device {
133 char type[THERMAL_NAME_LENGTH];
134 struct device device;
135 struct device_node *np;
137 const struct thermal_cooling_device_ops *ops;
138 bool updated; /* true if the cooling device does not need update */
139 struct mutex lock; /* protect thermal_instances list */
140 struct list_head thermal_instances;
141 struct list_head node;
144 struct thermal_attr {
145 struct device_attribute attr;
146 char name[THERMAL_NAME_LENGTH];
150 * struct thermal_zone_device - structure for a thermal zone
151 * @id: unique id number for each thermal zone
152 * @type: the thermal zone device type
153 * @device: &struct device for this thermal zone
154 * @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
155 * @trip_type_attrs: attributes for trip points for sysfs: trip type
156 * @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
157 * @devdata: private pointer for device private data
158 * @trips: number of trip points the thermal zone supports
159 * @passive_delay: number of milliseconds to wait between polls when
160 * performing passive cooling.
161 * @polling_delay: number of milliseconds to wait between polls when
162 * checking whether trip points have been crossed (0 for
163 * interrupt driven systems)
164 * @temperature: current temperature. This is only for core code,
165 * drivers should use thermal_zone_get_temp() to get the
166 * current temperature
167 * @last_temperature: previous temperature read
168 * @emul_temperature: emulated temperature when using CONFIG_THERMAL_EMULATION
169 * @passive: 1 if you've crossed a passive trip point, 0 otherwise.
170 * @forced_passive: If > 0, temperature at which to switch on all ACPI
171 * processor cooling devices. Currently only used by the
172 * step-wise governor.
173 * @ops: operations this &thermal_zone_device supports
174 * @tzp: thermal zone parameters
175 * @governor: pointer to the governor for this thermal zone
176 * @governor_data: private pointer for governor data
177 * @thermal_instances: list of &struct thermal_instance of this thermal zone
178 * @idr: &struct idr to generate unique id for this zone's cooling
180 * @lock: lock to protect thermal_instances list
181 * @node: node in thermal_tz_list (in thermal_core.c)
182 * @poll_queue: delayed work for polling
184 struct thermal_zone_device {
186 char type[THERMAL_NAME_LENGTH];
187 struct device device;
188 struct thermal_attr *trip_temp_attrs;
189 struct thermal_attr *trip_type_attrs;
190 struct thermal_attr *trip_hyst_attrs;
196 int last_temperature;
197 int emul_temperature;
199 unsigned int forced_passive;
200 struct thermal_zone_device_ops *ops;
201 struct thermal_zone_params *tzp;
202 struct thermal_governor *governor;
204 struct list_head thermal_instances;
207 struct list_head node;
208 struct delayed_work poll_queue;
212 * struct thermal_governor - structure that holds thermal governor information
213 * @name: name of the governor
214 * @bind_to_tz: callback called when binding to a thermal zone. If it
215 * returns 0, the governor is bound to the thermal zone,
216 * otherwise it fails.
217 * @unbind_from_tz: callback called when a governor is unbound from a
219 * @throttle: callback called for every trip point even if temperature is
220 * below the trip point temperature
221 * @governor_list: node in thermal_governor_list (in thermal_core.c)
223 struct thermal_governor {
224 char name[THERMAL_NAME_LENGTH];
225 int (*bind_to_tz)(struct thermal_zone_device *tz);
226 void (*unbind_from_tz)(struct thermal_zone_device *tz);
227 int (*throttle)(struct thermal_zone_device *tz, int trip);
228 struct list_head governor_list;
231 /* Structure that holds binding parameters for a zone */
232 struct thermal_bind_params {
233 struct thermal_cooling_device *cdev;
236 * This is a measure of 'how effectively these devices can
237 * cool 'this' thermal zone. It shall be determined by
238 * platform characterization. This value is relative to the
239 * rest of the weights so a cooling device whose weight is
240 * double that of another cooling device is twice as
241 * effective. See Documentation/thermal/sysfs-api.txt for more
247 * This is a bit mask that gives the binding relation between this
248 * thermal zone and cdev, for a particular trip point.
249 * See Documentation/thermal/sysfs-api.txt for more information.
254 * This is an array of cooling state limits. Must have exactly
255 * 2 * thermal_zone.number_of_trip_points. It is an array consisting
256 * of tuples <lower-state upper-state> of state limits. Each trip
257 * will be associated with one state limit tuple when binding.
258 * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
261 unsigned long *binding_limits;
262 int (*match) (struct thermal_zone_device *tz,
263 struct thermal_cooling_device *cdev);
266 /* Structure to define Thermal Zone parameters */
267 struct thermal_zone_params {
268 char governor_name[THERMAL_NAME_LENGTH];
271 * a boolean to indicate if the thermal to hwmon sysfs interface
272 * is required. when no_hwmon == false, a hwmon sysfs interface
273 * will be created. when no_hwmon == true, nothing will be done
277 int num_tbps; /* Number of tbp entries */
278 struct thermal_bind_params *tbp;
281 * Sustainable power (heat) that this thermal zone can dissipate in
284 u32 sustainable_power;
287 * Proportional parameter of the PID controller when
288 * overshooting (i.e., when temperature is below the target)
293 * Proportional parameter of the PID controller when
298 /* Integral parameter of the PID controller */
301 /* Derivative parameter of the PID controller */
304 /* threshold below which the error is no longer accumulated */
308 * @slope: slope of a linear temperature adjustment curve.
309 * Used by thermal zone drivers.
313 * @offset: offset of a linear temperature adjustment curve.
314 * Used by thermal zone drivers (default 0).
319 struct thermal_genl_event {
325 * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
328 * @get_temp: a pointer to a function that reads the sensor temperature.
331 * @get_trend: a pointer to a function that reads the sensor temperature trend.
332 * @set_emul_temp: a pointer to a function that sets sensor emulated
335 struct thermal_zone_of_device_ops {
336 int (*get_temp)(void *, int *);
337 int (*get_trend)(void *, long *);
338 int (*set_emul_temp)(void *, int);
342 * struct thermal_trip - representation of a point in temperature domain
343 * @np: pointer to struct device_node that this trip point was created from
344 * @temperature: temperature value in miliCelsius
345 * @hysteresis: relative hysteresis in miliCelsius
346 * @type: trip point type
349 struct thermal_trip {
350 struct device_node *np;
351 unsigned long int temperature;
352 unsigned long int hysteresis;
353 enum thermal_trip_type type;
356 /* Function declarations */
357 #ifdef CONFIG_THERMAL_OF
358 struct thermal_zone_device *
359 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
360 const struct thermal_zone_of_device_ops *ops);
361 void thermal_zone_of_sensor_unregister(struct device *dev,
362 struct thermal_zone_device *tz);
364 static inline struct thermal_zone_device *
365 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
366 const struct thermal_zone_of_device_ops *ops)
368 return ERR_PTR(-ENODEV);
372 void thermal_zone_of_sensor_unregister(struct device *dev,
373 struct thermal_zone_device *tz)
379 #if IS_ENABLED(CONFIG_THERMAL)
380 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
382 return cdev->ops->get_requested_power && cdev->ops->state2power &&
383 cdev->ops->power2state;
386 int power_actor_get_max_power(struct thermal_cooling_device *,
387 struct thermal_zone_device *tz, u32 *max_power);
388 int power_actor_get_min_power(struct thermal_cooling_device *,
389 struct thermal_zone_device *tz, u32 *min_power);
390 int power_actor_set_power(struct thermal_cooling_device *,
391 struct thermal_instance *, u32);
392 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
393 void *, struct thermal_zone_device_ops *,
394 struct thermal_zone_params *, int, int);
395 void thermal_zone_device_unregister(struct thermal_zone_device *);
397 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
398 struct thermal_cooling_device *,
399 unsigned long, unsigned long,
401 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
402 struct thermal_cooling_device *);
403 void thermal_zone_device_update(struct thermal_zone_device *);
405 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
406 const struct thermal_cooling_device_ops *);
407 struct thermal_cooling_device *
408 thermal_of_cooling_device_register(struct device_node *np, char *, void *,
409 const struct thermal_cooling_device_ops *);
410 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
411 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
412 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
414 int get_tz_trend(struct thermal_zone_device *, int);
415 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
416 struct thermal_cooling_device *, int);
417 void thermal_cdev_update(struct thermal_cooling_device *);
418 void thermal_notify_framework(struct thermal_zone_device *, int);
420 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
422 static inline int power_actor_get_max_power(struct thermal_cooling_device *cdev,
423 struct thermal_zone_device *tz, u32 *max_power)
425 static inline int power_actor_get_min_power(struct thermal_cooling_device *cdev,
426 struct thermal_zone_device *tz,
429 static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
430 struct thermal_instance *tz, u32 power)
432 static inline struct thermal_zone_device *thermal_zone_device_register(
433 const char *type, int trips, int mask, void *devdata,
434 struct thermal_zone_device_ops *ops,
435 const struct thermal_zone_params *tzp,
436 int passive_delay, int polling_delay)
437 { return ERR_PTR(-ENODEV); }
438 static inline void thermal_zone_device_unregister(
439 struct thermal_zone_device *tz)
441 static inline int thermal_zone_bind_cooling_device(
442 struct thermal_zone_device *tz, int trip,
443 struct thermal_cooling_device *cdev,
444 unsigned long upper, unsigned long lower,
447 static inline int thermal_zone_unbind_cooling_device(
448 struct thermal_zone_device *tz, int trip,
449 struct thermal_cooling_device *cdev)
451 static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
453 static inline struct thermal_cooling_device *
454 thermal_cooling_device_register(char *type, void *devdata,
455 const struct thermal_cooling_device_ops *ops)
456 { return ERR_PTR(-ENODEV); }
457 static inline struct thermal_cooling_device *
458 thermal_of_cooling_device_register(struct device_node *np,
459 char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
460 { return ERR_PTR(-ENODEV); }
461 static inline void thermal_cooling_device_unregister(
462 struct thermal_cooling_device *cdev)
464 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
466 { return ERR_PTR(-ENODEV); }
467 static inline int thermal_zone_get_temp(
468 struct thermal_zone_device *tz, int *temp)
470 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
472 static inline struct thermal_instance *
473 get_thermal_instance(struct thermal_zone_device *tz,
474 struct thermal_cooling_device *cdev, int trip)
475 { return ERR_PTR(-ENODEV); }
476 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
478 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
481 #endif /* CONFIG_THERMAL */
483 #if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
484 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
487 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
494 #endif /* __THERMAL_H__ */