include/linux/thermal.h

   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 (*set_trips) (struct thermal_zone_device *, int, int);
 102         int (*get_mode) (struct thermal_zone_device *,
 103                          enum thermal_device_mode *);
 104         int (*set_mode) (struct thermal_zone_device *,
 105                 enum thermal_device_mode);
 106         int (*get_trip_type) (struct thermal_zone_device *, int,
 107                 enum thermal_trip_type *);
 108         int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
 109         int (*set_trip_temp) (struct thermal_zone_device *, int, int);
 110         int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
 111         int (*set_trip_hyst) (struct thermal_zone_device *, int, int);
 112         int (*get_crit_temp) (struct thermal_zone_device *, int *);
 113         int (*set_emul_temp) (struct thermal_zone_device *, int);
 114         int (*get_trend) (struct thermal_zone_device *, int,
 115                           enum thermal_trend *);
 116         int (*notify) (struct thermal_zone_device *, int,
 117                        enum thermal_trip_type);
 118 };
 119
 120 struct thermal_cooling_device_ops {
 121         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 122         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 123         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 124         int (*get_requested_power)(struct thermal_cooling_device *,
 125                                    struct thermal_zone_device *, u32 *);
 126         int (*state2power)(struct thermal_cooling_device *,
 127                            struct thermal_zone_device *, unsigned long, u32 *);
 128         int (*power2state)(struct thermal_cooling_device *,
 129                            struct thermal_zone_device *, u32, unsigned long *);
 130 };
 131
 132 struct thermal_cooling_device {
 133         int id;
 134         char type[THERMAL_NAME_LENGTH];
 135         struct device device;
 136         struct device_node *np;
 137         void *devdata;
 138         const struct thermal_cooling_device_ops *ops;
 139         bool updated; /* true if the cooling device does not need update */
 140         struct mutex lock; /* protect thermal_instances list */
 141         struct list_head thermal_instances;
 142         struct list_head node;
 143 };
 144
 145 struct thermal_attr {
 146         struct device_attribute attr;
 147         char name[THERMAL_NAME_LENGTH];
 148 };
 149
 150 /**
 151  * struct thermal_zone_device - structure for a thermal zone
 152  * @id:         unique id number for each thermal zone
 153  * @type:       the thermal zone device type
 154  * @device:     &struct device for this thermal zone
 155  * @trip_temp_attrs:    attributes for trip points for sysfs: trip temperature
 156  * @trip_type_attrs:    attributes for trip points for sysfs: trip type
 157  * @trip_hyst_attrs:    attributes for trip points for sysfs: trip hysteresis
 158  * @devdata:    private pointer for device private data
 159  * @trips:      number of trip points the thermal zone supports
 160  * @trips_disabled;     bitmap for disabled trips
 161  * @passive_delay:      number of milliseconds to wait between polls when
 162  *                      performing passive cooling.
 163  * @polling_delay:      number of milliseconds to wait between polls when
 164  *                      checking whether trip points have been crossed (0 for
 165  *                      interrupt driven systems)
 166  * @temperature:        current temperature.  This is only for core code,
 167  *                      drivers should use thermal_zone_get_temp() to get the
 168  *                      current temperature
 169  * @last_temperature:   previous temperature read
 170  * @emul_temperature:   emulated temperature when using CONFIG_THERMAL_EMULATION
 171  * @passive:            1 if you've crossed a passive trip point, 0 otherwise.
 172  * @prev_low_trip:      the low current temperature if you've crossed a passive
 173                         trip point.
 174  * @prev_high_trip:     the above current temperature if you've crossed a
 175                         passive trip point.
 176  * @forced_passive:     If > 0, temperature at which to switch on all ACPI
 177  *                      processor cooling devices.  Currently only used by the
 178  *                      step-wise governor.
 179  * @need_update:        if equals 1, thermal_zone_device_update needs to be invoked.
 180  * @ops:        operations this &thermal_zone_device supports
 181  * @tzp:        thermal zone parameters
 182  * @governor:   pointer to the governor for this thermal zone
 183  * @governor_data:      private pointer for governor data
 184  * @thermal_instances:  list of &struct thermal_instance of this thermal zone
 185  * @idr:        &struct idr to generate unique id for this zone's cooling
 186  *              devices
 187  * @lock:       lock to protect thermal_instances list
 188  * @node:       node in thermal_tz_list (in thermal_core.c)
 189  * @poll_queue: delayed work for polling
 190  */
 191 struct thermal_zone_device {
 192         int id;
 193         char type[THERMAL_NAME_LENGTH];
 194         struct device device;
 195         struct thermal_attr *trip_temp_attrs;
 196         struct thermal_attr *trip_type_attrs;
 197         struct thermal_attr *trip_hyst_attrs;
 198         void *devdata;
 199         int trips;
 200         unsigned long trips_disabled;   /* bitmap for disabled trips */
 201         int passive_delay;
 202         int polling_delay;
 203         int temperature;
 204         int last_temperature;
 205         int emul_temperature;
 206         int passive;
 207         int prev_low_trip;
 208         int prev_high_trip;
 209         unsigned int forced_passive;
 210         atomic_t need_update;
 211         struct thermal_zone_device_ops *ops;
 212         struct thermal_zone_params *tzp;
 213         struct thermal_governor *governor;
 214         void *governor_data;
 215         struct list_head thermal_instances;
 216         struct idr idr;
 217         struct mutex lock;
 218         struct list_head node;
 219         struct delayed_work poll_queue;
 220 };
 221
 222 /**
 223  * struct thermal_governor - structure that holds thermal governor information
 224  * @name:       name of the governor
 225  * @bind_to_tz: callback called when binding to a thermal zone.  If it
 226  *              returns 0, the governor is bound to the thermal zone,
 227  *              otherwise it fails.
 228  * @unbind_from_tz:     callback called when a governor is unbound from a
 229  *                      thermal zone.
 230  * @throttle:   callback called for every trip point even if temperature is
 231  *              below the trip point temperature
 232  * @governor_list:      node in thermal_governor_list (in thermal_core.c)
 233  */
 234 struct thermal_governor {
 235         char name[THERMAL_NAME_LENGTH];
 236         int (*bind_to_tz)(struct thermal_zone_device *tz);
 237         void (*unbind_from_tz)(struct thermal_zone_device *tz);
 238         int (*throttle)(struct thermal_zone_device *tz, int trip);
 239         struct list_head        governor_list;
 240 };
 241
 242 /* Structure that holds binding parameters for a zone */
 243 struct thermal_bind_params {
 244         struct thermal_cooling_device *cdev;
 245
 246         /*
 247          * This is a measure of 'how effectively these devices can
 248          * cool 'this' thermal zone. It shall be determined by
 249          * platform characterization. This value is relative to the
 250          * rest of the weights so a cooling device whose weight is
 251          * double that of another cooling device is twice as
 252          * effective. See Documentation/thermal/sysfs-api.txt for more
 253          * information.
 254          */
 255         int weight;
 256
 257         /*
 258          * This is a bit mask that gives the binding relation between this
 259          * thermal zone and cdev, for a particular trip point.
 260          * See Documentation/thermal/sysfs-api.txt for more information.
 261          */
 262         int trip_mask;
 263
 264         /*
 265          * This is an array of cooling state limits. Must have exactly
 266          * 2 * thermal_zone.number_of_trip_points. It is an array consisting
 267          * of tuples <lower-state upper-state> of state limits. Each trip
 268          * will be associated with one state limit tuple when binding.
 269          * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
 270          * on all trips.
 271          */
 272         unsigned long *binding_limits;
 273         int (*match) (struct thermal_zone_device *tz,
 274                         struct thermal_cooling_device *cdev);
 275 };
 276
 277 /* Structure to define Thermal Zone parameters */
 278 struct thermal_zone_params {
 279         char governor_name[THERMAL_NAME_LENGTH];
 280
 281         /*
 282          * a boolean to indicate if the thermal to hwmon sysfs interface
 283          * is required. when no_hwmon == false, a hwmon sysfs interface
 284          * will be created. when no_hwmon == true, nothing will be done
 285          */
 286         bool no_hwmon;
 287
 288         int num_tbps;   /* Number of tbp entries */
 289         struct thermal_bind_params *tbp;
 290
 291         /*
 292          * Sustainable power (heat) that this thermal zone can dissipate in
 293          * mW
 294          */
 295         u32 sustainable_power;
 296
 297         /*
 298          * Proportional parameter of the PID controller when
 299          * overshooting (i.e., when temperature is below the target)
 300          */
 301         s32 k_po;
 302
 303         /*
 304          * Proportional parameter of the PID controller when
 305          * undershooting
 306          */
 307         s32 k_pu;
 308
 309         /* Integral parameter of the PID controller */
 310         s32 k_i;
 311
 312         /* Derivative parameter of the PID controller */
 313         s32 k_d;
 314
 315         /* threshold below which the error is no longer accumulated */
 316         s32 integral_cutoff;
 317
 318         /*
 319          * @slope:      slope of a linear temperature adjustment curve.
 320          *              Used by thermal zone drivers.
 321          */
 322         int slope;
 323         /*
 324          * @offset:     offset of a linear temperature adjustment curve.
 325          *              Used by thermal zone drivers (default 0).
 326          */
 327         int offset;
 328 };
 329
 330 struct thermal_genl_event {
 331         u32 orig;
 332         enum events event;
 333 };
 334
 335 /**
 336  * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
 337  *
 338  * Mandatory:
 339  * @get_temp: a pointer to a function that reads the sensor temperature.
 340  *
 341  * Optional:
 342  * @get_trend: a pointer to a function that reads the sensor temperature trend.
 343  * @set_trips: a pointer to a function that sets a temperature window. When
 344  *             this window is left the driver must inform the thermal core via
 345  *             thermal_zone_device_update.
 346  * @set_emul_temp: a pointer to a function that sets sensor emulated
 347  *                 temperature.
 348  * @set_trip_temp: a pointer to a function that sets the trip temperature on
 349  *                 hardware.
 350  */
 351 struct thermal_zone_of_device_ops {
 352         int (*get_temp)(void *, int *);
 353         int (*get_trend)(void *, int, enum thermal_trend *);
 354         int (*set_trips)(void *, int, int);
 355         int (*set_emul_temp)(void *, int);
 356         int (*set_trip_temp)(void *, int, int);
 357 };
 358
 359 /**
 360  * struct thermal_trip - representation of a point in temperature domain
 361  * @np: pointer to struct device_node that this trip point was created from
 362  * @temperature: temperature value in miliCelsius
 363  * @hysteresis: relative hysteresis in miliCelsius
 364  * @type: trip point type
 365  */
 366
 367 struct thermal_trip {
 368         struct device_node *np;
 369         int temperature;
 370         int hysteresis;
 371         enum thermal_trip_type type;
 372 };
 373
 374 /* Function declarations */
 375 #ifdef CONFIG_THERMAL_OF
 376 struct thermal_zone_device *
 377 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 378                                 const struct thermal_zone_of_device_ops *ops);
 379 void thermal_zone_of_sensor_unregister(struct device *dev,
 380                                        struct thermal_zone_device *tz);
 381 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
 382                 struct device *dev, int id, void *data,
 383                 const struct thermal_zone_of_device_ops *ops);
 384 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
 385                                             struct thermal_zone_device *tz);
 386 #else
 387 static inline struct thermal_zone_device *
 388 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 389                                 const struct thermal_zone_of_device_ops *ops)
 390 {
 391         return ERR_PTR(-ENODEV);
 392 }
 393
 394 static inline
 395 void thermal_zone_of_sensor_unregister(struct device *dev,
 396                                        struct thermal_zone_device *tz)
 397 {
 398 }
 399
 400 static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
 401                 struct device *dev, int id, void *data,
 402                 const struct thermal_zone_of_device_ops *ops)
 403 {
 404         return ERR_PTR(-ENODEV);
 405 }
 406
 407 static inline
 408 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
 409                                             struct thermal_zone_device *tz)
 410 {
 411 }
 412
 413 #endif
 414
 415 #if IS_ENABLED(CONFIG_THERMAL)
 416 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 417 {
 418         return cdev->ops->get_requested_power && cdev->ops->state2power &&
 419                 cdev->ops->power2state;
 420 }
 421
 422 int power_actor_get_max_power(struct thermal_cooling_device *,
 423                               struct thermal_zone_device *tz, u32 *max_power);
 424 int power_actor_get_min_power(struct thermal_cooling_device *,
 425                               struct thermal_zone_device *tz, u32 *min_power);
 426 int power_actor_set_power(struct thermal_cooling_device *,
 427                           struct thermal_instance *, u32);
 428 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 429                 void *, struct thermal_zone_device_ops *,
 430                 struct thermal_zone_params *, int, int);
 431 void thermal_zone_device_unregister(struct thermal_zone_device *);
 432
 433 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 434                                      struct thermal_cooling_device *,
 435                                      unsigned long, unsigned long,
 436                                      unsigned int);
 437 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 438                                        struct thermal_cooling_device *);
 439 void thermal_zone_device_update(struct thermal_zone_device *);
 440 void thermal_zone_set_trips(struct thermal_zone_device *);
 441
 442 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 443                 const struct thermal_cooling_device_ops *);
 444 struct thermal_cooling_device *
 445 thermal_of_cooling_device_register(struct device_node *np, char *, void *,
 446                                    const struct thermal_cooling_device_ops *);
 447 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 448 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
 449 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
 450 int thermal_zone_get_slope(struct thermal_zone_device *tz);
 451 int thermal_zone_get_offset(struct thermal_zone_device *tz);
 452
 453 int get_tz_trend(struct thermal_zone_device *, int);
 454 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 455                 struct thermal_cooling_device *, int);
 456 void thermal_cdev_update(struct thermal_cooling_device *);
 457 void thermal_notify_framework(struct thermal_zone_device *, int);
 458 #else
 459 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 460 { return false; }
 461 static inline int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 462                               struct thermal_zone_device *tz, u32 *max_power)
 463 { return 0; }
 464 static inline int power_actor_get_min_power(struct thermal_cooling_device *cdev,
 465                                             struct thermal_zone_device *tz,
 466                                             u32 *min_power)
 467 { return -ENODEV; }
 468 static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
 469                           struct thermal_instance *tz, u32 power)
 470 { return 0; }
 471 static inline struct thermal_zone_device *thermal_zone_device_register(
 472         const char *type, int trips, int mask, void *devdata,
 473         struct thermal_zone_device_ops *ops,
 474         const struct thermal_zone_params *tzp,
 475         int passive_delay, int polling_delay)
 476 { return ERR_PTR(-ENODEV); }
 477 static inline void thermal_zone_device_unregister(
 478         struct thermal_zone_device *tz)
 479 { }
 480 static inline int thermal_zone_bind_cooling_device(
 481         struct thermal_zone_device *tz, int trip,
 482         struct thermal_cooling_device *cdev,
 483         unsigned long upper, unsigned long lower,
 484         unsigned int weight)
 485 { return -ENODEV; }
 486 static inline int thermal_zone_unbind_cooling_device(
 487         struct thermal_zone_device *tz, int trip,
 488         struct thermal_cooling_device *cdev)
 489 { return -ENODEV; }
 490 static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
 491 { }
 492 static inline void thermal_zone_set_trips(struct thermal_zone_device *tz)
 493 { }
 494 static inline struct thermal_cooling_device *
 495 thermal_cooling_device_register(char *type, void *devdata,
 496         const struct thermal_cooling_device_ops *ops)
 497 { return ERR_PTR(-ENODEV); }
 498 static inline struct thermal_cooling_device *
 499 thermal_of_cooling_device_register(struct device_node *np,
 500         char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 501 { return ERR_PTR(-ENODEV); }
 502 static inline void thermal_cooling_device_unregister(
 503         struct thermal_cooling_device *cdev)
 504 { }
 505 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
 506                 const char *name)
 507 { return ERR_PTR(-ENODEV); }
 508 static inline int thermal_zone_get_temp(
 509                 struct thermal_zone_device *tz, int *temp)
 510 { return -ENODEV; }
 511 static inline int thermal_zone_get_slope(
 512                 struct thermal_zone_device *tz)
 513 { return -ENODEV; }
 514 static inline int thermal_zone_get_offset(
 515                 struct thermal_zone_device *tz)
 516 { return -ENODEV; }
 517 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
 518 { return -ENODEV; }
 519 static inline struct thermal_instance *
 520 get_thermal_instance(struct thermal_zone_device *tz,
 521         struct thermal_cooling_device *cdev, int trip)
 522 { return ERR_PTR(-ENODEV); }
 523 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
 524 { }
 525 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
 526         int trip)
 527 { }
 528 #endif /* CONFIG_THERMAL */
 529
 530 #if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
 531 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 532                                                 enum events event);
 533 #else
 534 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 535                                                 enum events event)
 536 {
 537         return 0;
 538 }
 539 #endif
 540
 541 #endif /* __THERMAL_H__ */