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Linux/include/linux/thermal.h

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  1 /*
  2  *  thermal.h  ($Revision: 0 $)
  3  *
  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>
  7  *
  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.
 12  *
 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.
 17  *
 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.
 21  *
 22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 23  */
 24 
 25 #ifndef __THERMAL_H__
 26 #define __THERMAL_H__
 27 
 28 #include <linux/of.h>
 29 #include <linux/idr.h>
 30 #include <linux/device.h>
 31 #include <linux/workqueue.h>
 32 #include <uapi/linux/thermal.h>
 33 
 34 #define THERMAL_TRIPS_NONE      -1
 35 #define THERMAL_MAX_TRIPS       12
 36 
 37 /* invalid cooling state */
 38 #define THERMAL_CSTATE_INVALID -1UL
 39 
 40 /* No upper/lower limit requirement */
 41 #define THERMAL_NO_LIMIT        ((u32)~0)
 42 
 43 /* Default weight of a bound cooling device */
 44 #define THERMAL_WEIGHT_DEFAULT 0
 45 
 46 /* use value, which < 0K, to indicate an invalid/uninitialized temperature */
 47 #define THERMAL_TEMP_INVALID    -274000
 48 
 49 /* Unit conversion macros */
 50 #define DECI_KELVIN_TO_CELSIUS(t)       ({                      \
 51         long _t = (t);                                          \
 52         ((_t-2732 >= 0) ? (_t-2732+5)/10 : (_t-2732-5)/10);     \
 53 })
 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)
 59 
 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"
 69 #endif
 70 
 71 struct thermal_zone_device;
 72 struct thermal_cooling_device;
 73 struct thermal_instance;
 74 
 75 enum thermal_device_mode {
 76         THERMAL_DEVICE_DISABLED = 0,
 77         THERMAL_DEVICE_ENABLED,
 78 };
 79 
 80 enum thermal_trip_type {
 81         THERMAL_TRIP_ACTIVE = 0,
 82         THERMAL_TRIP_PASSIVE,
 83         THERMAL_TRIP_HOT,
 84         THERMAL_TRIP_CRITICAL,
 85 };
 86 
 87 enum thermal_trend {
 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 */
 93 };
 94 
 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);
117 };
118 
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 *);
129 };
130 
131 struct thermal_cooling_device {
132         int id;
133         char type[THERMAL_NAME_LENGTH];
134         struct device device;
135         struct device_node *np;
136         void *devdata;
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;
142 };
143 
144 struct thermal_attr {
145         struct device_attribute attr;
146         char name[THERMAL_NAME_LENGTH];
147 };
148 
149 /**
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  * @trips_disabled;     bitmap for disabled trips
160  * @passive_delay:      number of milliseconds to wait between polls when
161  *                      performing passive cooling.
162  * @polling_delay:      number of milliseconds to wait between polls when
163  *                      checking whether trip points have been crossed (0 for
164  *                      interrupt driven systems)
165  * @temperature:        current temperature.  This is only for core code,
166  *                      drivers should use thermal_zone_get_temp() to get the
167  *                      current temperature
168  * @last_temperature:   previous temperature read
169  * @emul_temperature:   emulated temperature when using CONFIG_THERMAL_EMULATION
170  * @passive:            1 if you've crossed a passive trip point, 0 otherwise.
171  * @forced_passive:     If > 0, temperature at which to switch on all ACPI
172  *                      processor cooling devices.  Currently only used by the
173  *                      step-wise governor.
174  * @need_update:        if equals 1, thermal_zone_device_update needs to be invoked.
175  * @ops:        operations this &thermal_zone_device supports
176  * @tzp:        thermal zone parameters
177  * @governor:   pointer to the governor for this thermal zone
178  * @governor_data:      private pointer for governor data
179  * @thermal_instances:  list of &struct thermal_instance of this thermal zone
180  * @idr:        &struct idr to generate unique id for this zone's cooling
181  *              devices
182  * @lock:       lock to protect thermal_instances list
183  * @node:       node in thermal_tz_list (in thermal_core.c)
184  * @poll_queue: delayed work for polling
185  */
186 struct thermal_zone_device {
187         int id;
188         char type[THERMAL_NAME_LENGTH];
189         struct device device;
190         struct thermal_attr *trip_temp_attrs;
191         struct thermal_attr *trip_type_attrs;
192         struct thermal_attr *trip_hyst_attrs;
193         void *devdata;
194         int trips;
195         unsigned long trips_disabled;   /* bitmap for disabled trips */
196         int passive_delay;
197         int polling_delay;
198         int temperature;
199         int last_temperature;
200         int emul_temperature;
201         int passive;
202         unsigned int forced_passive;
203         atomic_t need_update;
204         struct thermal_zone_device_ops *ops;
205         struct thermal_zone_params *tzp;
206         struct thermal_governor *governor;
207         void *governor_data;
208         struct list_head thermal_instances;
209         struct idr idr;
210         struct mutex lock;
211         struct list_head node;
212         struct delayed_work poll_queue;
213 };
214 
215 /**
216  * struct thermal_governor - structure that holds thermal governor information
217  * @name:       name of the governor
218  * @bind_to_tz: callback called when binding to a thermal zone.  If it
219  *              returns 0, the governor is bound to the thermal zone,
220  *              otherwise it fails.
221  * @unbind_from_tz:     callback called when a governor is unbound from a
222  *                      thermal zone.
223  * @throttle:   callback called for every trip point even if temperature is
224  *              below the trip point temperature
225  * @governor_list:      node in thermal_governor_list (in thermal_core.c)
226  */
227 struct thermal_governor {
228         char name[THERMAL_NAME_LENGTH];
229         int (*bind_to_tz)(struct thermal_zone_device *tz);
230         void (*unbind_from_tz)(struct thermal_zone_device *tz);
231         int (*throttle)(struct thermal_zone_device *tz, int trip);
232         struct list_head        governor_list;
233 };
234 
235 /* Structure that holds binding parameters for a zone */
236 struct thermal_bind_params {
237         struct thermal_cooling_device *cdev;
238 
239         /*
240          * This is a measure of 'how effectively these devices can
241          * cool 'this' thermal zone. It shall be determined by
242          * platform characterization. This value is relative to the
243          * rest of the weights so a cooling device whose weight is
244          * double that of another cooling device is twice as
245          * effective. See Documentation/thermal/sysfs-api.txt for more
246          * information.
247          */
248         int weight;
249 
250         /*
251          * This is a bit mask that gives the binding relation between this
252          * thermal zone and cdev, for a particular trip point.
253          * See Documentation/thermal/sysfs-api.txt for more information.
254          */
255         int trip_mask;
256 
257         /*
258          * This is an array of cooling state limits. Must have exactly
259          * 2 * thermal_zone.number_of_trip_points. It is an array consisting
260          * of tuples <lower-state upper-state> of state limits. Each trip
261          * will be associated with one state limit tuple when binding.
262          * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
263          * on all trips.
264          */
265         unsigned long *binding_limits;
266         int (*match) (struct thermal_zone_device *tz,
267                         struct thermal_cooling_device *cdev);
268 };
269 
270 /* Structure to define Thermal Zone parameters */
271 struct thermal_zone_params {
272         char governor_name[THERMAL_NAME_LENGTH];
273 
274         /*
275          * a boolean to indicate if the thermal to hwmon sysfs interface
276          * is required. when no_hwmon == false, a hwmon sysfs interface
277          * will be created. when no_hwmon == true, nothing will be done
278          */
279         bool no_hwmon;
280 
281         int num_tbps;   /* Number of tbp entries */
282         struct thermal_bind_params *tbp;
283 
284         /*
285          * Sustainable power (heat) that this thermal zone can dissipate in
286          * mW
287          */
288         u32 sustainable_power;
289 
290         /*
291          * Proportional parameter of the PID controller when
292          * overshooting (i.e., when temperature is below the target)
293          */
294         s32 k_po;
295 
296         /*
297          * Proportional parameter of the PID controller when
298          * undershooting
299          */
300         s32 k_pu;
301 
302         /* Integral parameter of the PID controller */
303         s32 k_i;
304 
305         /* Derivative parameter of the PID controller */
306         s32 k_d;
307 
308         /* threshold below which the error is no longer accumulated */
309         s32 integral_cutoff;
310 
311         /*
312          * @slope:      slope of a linear temperature adjustment curve.
313          *              Used by thermal zone drivers.
314          */
315         int slope;
316         /*
317          * @offset:     offset of a linear temperature adjustment curve.
318          *              Used by thermal zone drivers (default 0).
319          */
320         int offset;
321 };
322 
323 struct thermal_genl_event {
324         u32 orig;
325         enum events event;
326 };
327 
328 /**
329  * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
330  *
331  * Mandatory:
332  * @get_temp: a pointer to a function that reads the sensor temperature.
333  *
334  * Optional:
335  * @get_trend: a pointer to a function that reads the sensor temperature trend.
336  * @set_emul_temp: a pointer to a function that sets sensor emulated
337  *                 temperature.
338  */
339 struct thermal_zone_of_device_ops {
340         int (*get_temp)(void *, int *);
341         int (*get_trend)(void *, long *);
342         int (*set_emul_temp)(void *, int);
343 };
344 
345 /**
346  * struct thermal_trip - representation of a point in temperature domain
347  * @np: pointer to struct device_node that this trip point was created from
348  * @temperature: temperature value in miliCelsius
349  * @hysteresis: relative hysteresis in miliCelsius
350  * @type: trip point type
351  */
352 
353 struct thermal_trip {
354         struct device_node *np;
355         int temperature;
356         int hysteresis;
357         enum thermal_trip_type type;
358 };
359 
360 /* Function declarations */
361 #ifdef CONFIG_THERMAL_OF
362 struct thermal_zone_device *
363 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
364                                 const struct thermal_zone_of_device_ops *ops);
365 void thermal_zone_of_sensor_unregister(struct device *dev,
366                                        struct thermal_zone_device *tz);
367 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
368                 struct device *dev, int id, void *data,
369                 const struct thermal_zone_of_device_ops *ops);
370 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
371                                             struct thermal_zone_device *tz);
372 #else
373 static inline struct thermal_zone_device *
374 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
375                                 const struct thermal_zone_of_device_ops *ops)
376 {
377         return ERR_PTR(-ENODEV);
378 }
379 
380 static inline
381 void thermal_zone_of_sensor_unregister(struct device *dev,
382                                        struct thermal_zone_device *tz)
383 {
384 }
385 
386 static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
387                 struct device *dev, int id, void *data,
388                 const struct thermal_zone_of_device_ops *ops)
389 {
390         return ERR_PTR(-ENODEV);
391 }
392 
393 static inline
394 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
395                                             struct thermal_zone_device *tz)
396 {
397 }
398 
399 #endif
400 
401 #if IS_ENABLED(CONFIG_THERMAL)
402 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
403 {
404         return cdev->ops->get_requested_power && cdev->ops->state2power &&
405                 cdev->ops->power2state;
406 }
407 
408 int power_actor_get_max_power(struct thermal_cooling_device *,
409                               struct thermal_zone_device *tz, u32 *max_power);
410 int power_actor_get_min_power(struct thermal_cooling_device *,
411                               struct thermal_zone_device *tz, u32 *min_power);
412 int power_actor_set_power(struct thermal_cooling_device *,
413                           struct thermal_instance *, u32);
414 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
415                 void *, struct thermal_zone_device_ops *,
416                 struct thermal_zone_params *, int, int);
417 void thermal_zone_device_unregister(struct thermal_zone_device *);
418 
419 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
420                                      struct thermal_cooling_device *,
421                                      unsigned long, unsigned long,
422                                      unsigned int);
423 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
424                                        struct thermal_cooling_device *);
425 void thermal_zone_device_update(struct thermal_zone_device *);
426 
427 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
428                 const struct thermal_cooling_device_ops *);
429 struct thermal_cooling_device *
430 thermal_of_cooling_device_register(struct device_node *np, char *, void *,
431                                    const struct thermal_cooling_device_ops *);
432 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
433 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
434 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
435 
436 int get_tz_trend(struct thermal_zone_device *, int);
437 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
438                 struct thermal_cooling_device *, int);
439 void thermal_cdev_update(struct thermal_cooling_device *);
440 void thermal_notify_framework(struct thermal_zone_device *, int);
441 #else
442 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
443 { return false; }
444 static inline int power_actor_get_max_power(struct thermal_cooling_device *cdev,
445                               struct thermal_zone_device *tz, u32 *max_power)
446 { return 0; }
447 static inline int power_actor_get_min_power(struct thermal_cooling_device *cdev,
448                                             struct thermal_zone_device *tz,
449                                             u32 *min_power)
450 { return -ENODEV; }
451 static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
452                           struct thermal_instance *tz, u32 power)
453 { return 0; }
454 static inline struct thermal_zone_device *thermal_zone_device_register(
455         const char *type, int trips, int mask, void *devdata,
456         struct thermal_zone_device_ops *ops,
457         const struct thermal_zone_params *tzp,
458         int passive_delay, int polling_delay)
459 { return ERR_PTR(-ENODEV); }
460 static inline void thermal_zone_device_unregister(
461         struct thermal_zone_device *tz)
462 { }
463 static inline int thermal_zone_bind_cooling_device(
464         struct thermal_zone_device *tz, int trip,
465         struct thermal_cooling_device *cdev,
466         unsigned long upper, unsigned long lower,
467         unsigned int weight)
468 { return -ENODEV; }
469 static inline int thermal_zone_unbind_cooling_device(
470         struct thermal_zone_device *tz, int trip,
471         struct thermal_cooling_device *cdev)
472 { return -ENODEV; }
473 static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
474 { }
475 static inline struct thermal_cooling_device *
476 thermal_cooling_device_register(char *type, void *devdata,
477         const struct thermal_cooling_device_ops *ops)
478 { return ERR_PTR(-ENODEV); }
479 static inline struct thermal_cooling_device *
480 thermal_of_cooling_device_register(struct device_node *np,
481         char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
482 { return ERR_PTR(-ENODEV); }
483 static inline void thermal_cooling_device_unregister(
484         struct thermal_cooling_device *cdev)
485 { }
486 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
487                 const char *name)
488 { return ERR_PTR(-ENODEV); }
489 static inline int thermal_zone_get_temp(
490                 struct thermal_zone_device *tz, int *temp)
491 { return -ENODEV; }
492 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
493 { return -ENODEV; }
494 static inline struct thermal_instance *
495 get_thermal_instance(struct thermal_zone_device *tz,
496         struct thermal_cooling_device *cdev, int trip)
497 { return ERR_PTR(-ENODEV); }
498 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
499 { }
500 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
501         int trip)
502 { }
503 #endif /* CONFIG_THERMAL */
504 
505 #if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
506 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
507                                                 enum events event);
508 #else
509 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
510                                                 enum events event)
511 {
512         return 0;
513 }
514 #endif
515 
516 #endif /* __THERMAL_H__ */
517 

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