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 <rui.zhang@intel.com>
   7  *  Copyright (C) 2008  Sujith Thomas <sujith.thomas@intel.com>
   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 #define THERMAL_TRIPS_NONE      -1
  21 #define THERMAL_MAX_TRIPS       12
  22
  23 /* invalid cooling state */
  24 #define THERMAL_CSTATE_INVALID -1UL
  25
  26 /* No upper/lower limit requirement */
  27 #define THERMAL_NO_LIMIT        ((u32)~0)
  28
  29 /* Default weight of a bound cooling device */
  30 #define THERMAL_WEIGHT_DEFAULT 0
  31
  32 /* use value, which < 0K, to indicate an invalid/uninitialized temperature */
  33 #define THERMAL_TEMP_INVALID    -274000
  34
  35 /* Default Thermal Governor */
  36 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
  37 #define DEFAULT_THERMAL_GOVERNOR       "step_wise"
  38 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
  39 #define DEFAULT_THERMAL_GOVERNOR       "fair_share"
  40 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
  41 #define DEFAULT_THERMAL_GOVERNOR       "user_space"
  42 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR)
  43 #define DEFAULT_THERMAL_GOVERNOR       "power_allocator"
  44 #endif
  45
  46 struct thermal_zone_device;
  47 struct thermal_cooling_device;
  48 struct thermal_instance;
  49
  50 enum thermal_device_mode {
  51         THERMAL_DEVICE_DISABLED = 0,
  52         THERMAL_DEVICE_ENABLED,
  53 };
  54
  55 enum thermal_trip_type {
  56         THERMAL_TRIP_ACTIVE = 0,
  57         THERMAL_TRIP_PASSIVE,
  58         THERMAL_TRIP_HOT,
  59         THERMAL_TRIP_CRITICAL,
  60 };
  61
  62 enum thermal_trend {
  63         THERMAL_TREND_STABLE, /* temperature is stable */
  64         THERMAL_TREND_RAISING, /* temperature is raising */
  65         THERMAL_TREND_DROPPING, /* temperature is dropping */
  66         THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
  67         THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
  68 };
  69
  70 /* Thermal notification reason */
  71 enum thermal_notify_event {
  72         THERMAL_EVENT_UNSPECIFIED, /* Unspecified event */
  73         THERMAL_EVENT_TEMP_SAMPLE, /* New Temperature sample */
  74         THERMAL_TRIP_VIOLATED, /* TRIP Point violation */
  75         THERMAL_TRIP_CHANGED, /* TRIP Point temperature changed */
  76         THERMAL_DEVICE_DOWN, /* Thermal device is down */
  77         THERMAL_DEVICE_UP, /* Thermal device is up after a down event */
  78         THERMAL_DEVICE_POWER_CAPABILITY_CHANGED, /* power capability changed */
  79         THERMAL_TABLE_CHANGED, /* Thermal table(s) changed */
  80 };
  81
  82 struct thermal_zone_device_ops {
  83         int (*bind) (struct thermal_zone_device *,
  84                      struct thermal_cooling_device *);
  85         int (*unbind) (struct thermal_zone_device *,
  86                        struct thermal_cooling_device *);
  87         int (*get_temp) (struct thermal_zone_device *, int *);
  88         int (*set_trips) (struct thermal_zone_device *, int, int);
  89         int (*get_mode) (struct thermal_zone_device *,
  90                          enum thermal_device_mode *);
  91         int (*set_mode) (struct thermal_zone_device *,
  92                 enum thermal_device_mode);
  93         int (*get_trip_type) (struct thermal_zone_device *, int,
  94                 enum thermal_trip_type *);
  95         int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
  96         int (*set_trip_temp) (struct thermal_zone_device *, int, int);
  97         int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
  98         int (*set_trip_hyst) (struct thermal_zone_device *, int, int);
  99         int (*get_crit_temp) (struct thermal_zone_device *, int *);
 100         int (*set_emul_temp) (struct thermal_zone_device *, int);
 101         int (*get_trend) (struct thermal_zone_device *, int,
 102                           enum thermal_trend *);
 103         int (*notify) (struct thermal_zone_device *, int,
 104                        enum thermal_trip_type);
 105 };
 106
 107 struct thermal_cooling_device_ops {
 108         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 109         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 110         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 111         int (*get_requested_power)(struct thermal_cooling_device *,
 112                                    struct thermal_zone_device *, u32 *);
 113         int (*state2power)(struct thermal_cooling_device *,
 114                            struct thermal_zone_device *, unsigned long, u32 *);
 115         int (*power2state)(struct thermal_cooling_device *,
 116                            struct thermal_zone_device *, u32, unsigned long *);
 117 };
 118
 119 struct thermal_cooling_device {
 120         int id;
 121         char type[THERMAL_NAME_LENGTH];
 122         struct device device;
 123         struct device_node *np;
 124         void *devdata;
 125         void *stats;
 126         const struct thermal_cooling_device_ops *ops;
 127         bool updated; /* true if the cooling device does not need update */
 128         struct mutex lock; /* protect thermal_instances list */
 129         struct list_head thermal_instances;
 130         struct list_head node;
 131 };
 132
 133 struct thermal_attr {
 134         struct device_attribute attr;
 135         char name[THERMAL_NAME_LENGTH];
 136 };
 137
 138 /**
 139  * struct thermal_zone_device - structure for a thermal zone
 140  * @id:         unique id number for each thermal zone
 141  * @type:       the thermal zone device type
 142  * @device:     &struct device for this thermal zone
 143  * @trip_temp_attrs:    attributes for trip points for sysfs: trip temperature
 144  * @trip_type_attrs:    attributes for trip points for sysfs: trip type
 145  * @trip_hyst_attrs:    attributes for trip points for sysfs: trip hysteresis
 146  * @devdata:    private pointer for device private data
 147  * @trips:      number of trip points the thermal zone supports
 148  * @trips_disabled;     bitmap for disabled trips
 149  * @passive_delay:      number of milliseconds to wait between polls when
 150  *                      performing passive cooling.
 151  * @polling_delay:      number of milliseconds to wait between polls when
 152  *                      checking whether trip points have been crossed (0 for
 153  *                      interrupt driven systems)
 154  * @temperature:        current temperature.  This is only for core code,
 155  *                      drivers should use thermal_zone_get_temp() to get the
 156  *                      current temperature
 157  * @last_temperature:   previous temperature read
 158  * @emul_temperature:   emulated temperature when using CONFIG_THERMAL_EMULATION
 159  * @passive:            1 if you've crossed a passive trip point, 0 otherwise.
 160  * @prev_low_trip:      the low current temperature if you've crossed a passive
 161                         trip point.
 162  * @prev_high_trip:     the above current temperature if you've crossed a
 163                         passive trip point.
 164  * @forced_passive:     If > 0, temperature at which to switch on all ACPI
 165  *                      processor cooling devices.  Currently only used by the
 166  *                      step-wise governor.
 167  * @need_update:        if equals 1, thermal_zone_device_update needs to be invoked.
 168  * @ops:        operations this &thermal_zone_device supports
 169  * @tzp:        thermal zone parameters
 170  * @governor:   pointer to the governor for this thermal zone
 171  * @governor_data:      private pointer for governor data
 172  * @thermal_instances:  list of &struct thermal_instance of this thermal zone
 173  * @ida:        &struct ida to generate unique id for this zone's cooling
 174  *              devices
 175  * @lock:       lock to protect thermal_instances list
 176  * @node:       node in thermal_tz_list (in thermal_core.c)
 177  * @poll_queue: delayed work for polling
 178  * @notify_event: Last notification event
 179  */
 180 struct thermal_zone_device {
 181         int id;
 182         char type[THERMAL_NAME_LENGTH];
 183         struct device device;
 184         struct attribute_group trips_attribute_group;
 185         struct thermal_attr *trip_temp_attrs;
 186         struct thermal_attr *trip_type_attrs;
 187         struct thermal_attr *trip_hyst_attrs;
 188         void *devdata;
 189         int trips;
 190         unsigned long trips_disabled;   /* bitmap for disabled trips */
 191         int passive_delay;
 192         int polling_delay;
 193         int temperature;
 194         int last_temperature;
 195         int emul_temperature;
 196         int passive;
 197         int prev_low_trip;
 198         int prev_high_trip;
 199         unsigned int forced_passive;
 200         atomic_t need_update;
 201         struct thermal_zone_device_ops *ops;
 202         struct thermal_zone_params *tzp;
 203         struct thermal_governor *governor;
 204         void *governor_data;
 205         struct list_head thermal_instances;
 206         struct ida ida;
 207         struct mutex lock;
 208         struct list_head node;
 209         struct delayed_work poll_queue;
 210         enum thermal_notify_event notify_event;
 211 };
 212
 213 /**
 214  * struct thermal_governor - structure that holds thermal governor information
 215  * @name:       name of the governor
 216  * @bind_to_tz: callback called when binding to a thermal zone.  If it
 217  *              returns 0, the governor is bound to the thermal zone,
 218  *              otherwise it fails.
 219  * @unbind_from_tz:     callback called when a governor is unbound from a
 220  *                      thermal zone.
 221  * @throttle:   callback called for every trip point even if temperature is
 222  *              below the trip point temperature
 223  * @governor_list:      node in thermal_governor_list (in thermal_core.c)
 224  */
 225 struct thermal_governor {
 226         char name[THERMAL_NAME_LENGTH];
 227         int (*bind_to_tz)(struct thermal_zone_device *tz);
 228         void (*unbind_from_tz)(struct thermal_zone_device *tz);
 229         int (*throttle)(struct thermal_zone_device *tz, int trip);
 230         struct list_head        governor_list;
 231 };
 232
 233 /* Structure that holds binding parameters for a zone */
 234 struct thermal_bind_params {
 235         struct thermal_cooling_device *cdev;
 236
 237         /*
 238          * This is a measure of 'how effectively these devices can
 239          * cool 'this' thermal zone. It shall be determined by
 240          * platform characterization. This value is relative to the
 241          * rest of the weights so a cooling device whose weight is
 242          * double that of another cooling device is twice as
 243          * effective. See Documentation/driver-api/thermal/sysfs-api.rst for more
 244          * information.
 245          */
 246         int weight;
 247
 248         /*
 249          * This is a bit mask that gives the binding relation between this
 250          * thermal zone and cdev, for a particular trip point.
 251          * See Documentation/driver-api/thermal/sysfs-api.rst for more information.
 252          */
 253         int trip_mask;
 254
 255         /*
 256          * This is an array of cooling state limits. Must have exactly
 257          * 2 * thermal_zone.number_of_trip_points. It is an array consisting
 258          * of tuples <lower-state upper-state> of state limits. Each trip
 259          * will be associated with one state limit tuple when binding.
 260          * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
 261          * on all trips.
 262          */
 263         unsigned long *binding_limits;
 264         int (*match) (struct thermal_zone_device *tz,
 265                         struct thermal_cooling_device *cdev);
 266 };
 267
 268 /* Structure to define Thermal Zone parameters */
 269 struct thermal_zone_params {
 270         char governor_name[THERMAL_NAME_LENGTH];
 271
 272         /*
 273          * a boolean to indicate if the thermal to hwmon sysfs interface
 274          * is required. when no_hwmon == false, a hwmon sysfs interface
 275          * will be created. when no_hwmon == true, nothing will be done
 276          */
 277         bool no_hwmon;
 278
 279         int num_tbps;   /* Number of tbp entries */
 280         struct thermal_bind_params *tbp;
 281
 282         /*
 283          * Sustainable power (heat) that this thermal zone can dissipate in
 284          * mW
 285          */
 286         u32 sustainable_power;
 287
 288         /*
 289          * Proportional parameter of the PID controller when
 290          * overshooting (i.e., when temperature is below the target)
 291          */
 292         s32 k_po;
 293
 294         /*
 295          * Proportional parameter of the PID controller when
 296          * undershooting
 297          */
 298         s32 k_pu;
 299
 300         /* Integral parameter of the PID controller */
 301         s32 k_i;
 302
 303         /* Derivative parameter of the PID controller */
 304         s32 k_d;
 305
 306         /* threshold below which the error is no longer accumulated */
 307         s32 integral_cutoff;
 308
 309         /*
 310          * @slope:      slope of a linear temperature adjustment curve.
 311          *              Used by thermal zone drivers.
 312          */
 313         int slope;
 314         /*
 315          * @offset:     offset of a linear temperature adjustment curve.
 316          *              Used by thermal zone drivers (default 0).
 317          */
 318         int offset;
 319 };
 320
 321 struct thermal_genl_event {
 322         u32 orig;
 323         enum events event;
 324 };
 325
 326 /**
 327  * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
 328  *
 329  * Mandatory:
 330  * @get_temp: a pointer to a function that reads the sensor temperature.
 331  *
 332  * Optional:
 333  * @get_trend: a pointer to a function that reads the sensor temperature trend.
 334  * @set_trips: a pointer to a function that sets a temperature window. When
 335  *             this window is left the driver must inform the thermal core via
 336  *             thermal_zone_device_update.
 337  * @set_emul_temp: a pointer to a function that sets sensor emulated
 338  *                 temperature.
 339  * @set_trip_temp: a pointer to a function that sets the trip temperature on
 340  *                 hardware.
 341  */
 342 struct thermal_zone_of_device_ops {
 343         int (*get_temp)(void *, int *);
 344         int (*get_trend)(void *, int, enum thermal_trend *);
 345         int (*set_trips)(void *, int, int);
 346         int (*set_emul_temp)(void *, int);
 347         int (*set_trip_temp)(void *, int, int);
 348 };
 349
 350 /**
 351  * struct thermal_trip - representation of a point in temperature domain
 352  * @np: pointer to struct device_node that this trip point was created from
 353  * @temperature: temperature value in miliCelsius
 354  * @hysteresis: relative hysteresis in miliCelsius
 355  * @type: trip point type
 356  */
 357
 358 struct thermal_trip {
 359         struct device_node *np;
 360         int temperature;
 361         int hysteresis;
 362         enum thermal_trip_type type;
 363 };
 364
 365 /* Function declarations */
 366 #ifdef CONFIG_THERMAL_OF
 367 int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
 368                                   struct device_node *sensor_np,
 369                                   u32 *id);
 370 struct thermal_zone_device *
 371 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 372                                 const struct thermal_zone_of_device_ops *ops);
 373 void thermal_zone_of_sensor_unregister(struct device *dev,
 374                                        struct thermal_zone_device *tz);
 375 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
 376                 struct device *dev, int id, void *data,
 377                 const struct thermal_zone_of_device_ops *ops);
 378 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
 379                                             struct thermal_zone_device *tz);
 380 #else
 381
 382 static inline int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
 383                                          struct device_node *sensor_np,
 384                                          u32 *id)
 385 {
 386         return -ENOENT;
 387 }
 388 static inline struct thermal_zone_device *
 389 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 390                                 const struct thermal_zone_of_device_ops *ops)
 391 {
 392         return ERR_PTR(-ENODEV);
 393 }
 394
 395 static inline
 396 void thermal_zone_of_sensor_unregister(struct device *dev,
 397                                        struct thermal_zone_device *tz)
 398 {
 399 }
 400
 401 static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
 402                 struct device *dev, int id, void *data,
 403                 const struct thermal_zone_of_device_ops *ops)
 404 {
 405         return ERR_PTR(-ENODEV);
 406 }
 407
 408 static inline
 409 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
 410                                             struct thermal_zone_device *tz)
 411 {
 412 }
 413
 414 #endif
 415
 416 #if IS_ENABLED(CONFIG_THERMAL)
 417 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 418 {
 419         return cdev->ops->get_requested_power && cdev->ops->state2power &&
 420                 cdev->ops->power2state;
 421 }
 422
 423 int power_actor_get_max_power(struct thermal_cooling_device *,
 424                               struct thermal_zone_device *tz, u32 *max_power);
 425 int power_actor_get_min_power(struct thermal_cooling_device *,
 426                               struct thermal_zone_device *tz, u32 *min_power);
 427 int power_actor_set_power(struct thermal_cooling_device *,
 428                           struct thermal_instance *, u32);
 429 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 430                 void *, struct thermal_zone_device_ops *,
 431                 struct thermal_zone_params *, int, int);
 432 void thermal_zone_device_unregister(struct thermal_zone_device *);
 433
 434 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 435                                      struct thermal_cooling_device *,
 436                                      unsigned long, unsigned long,
 437                                      unsigned int);
 438 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 439                                        struct thermal_cooling_device *);
 440 void thermal_zone_device_update(struct thermal_zone_device *,
 441                                 enum thermal_notify_event);
 442 void thermal_zone_set_trips(struct thermal_zone_device *);
 443
 444 struct thermal_cooling_device *thermal_cooling_device_register(const char *,
 445                 void *, const struct thermal_cooling_device_ops *);
 446 struct thermal_cooling_device *
 447 thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
 448                                    const struct thermal_cooling_device_ops *);
 449 struct thermal_cooling_device *
 450 devm_thermal_of_cooling_device_register(struct device *dev,
 451                                 struct device_node *np,
 452                                 char *type, void *devdata,
 453                                 const struct thermal_cooling_device_ops *ops);
 454 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 455 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
 456 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
 457 int thermal_zone_get_slope(struct thermal_zone_device *tz);
 458 int thermal_zone_get_offset(struct thermal_zone_device *tz);
 459
 460 int get_tz_trend(struct thermal_zone_device *, int);
 461 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 462                 struct thermal_cooling_device *, int);
 463 void thermal_cdev_update(struct thermal_cooling_device *);
 464 void thermal_notify_framework(struct thermal_zone_device *, int);
 465 #else
 466 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 467 { return false; }
 468 static inline int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 469                               struct thermal_zone_device *tz, u32 *max_power)
 470 { return 0; }
 471 static inline int power_actor_get_min_power(struct thermal_cooling_device *cdev,
 472                                             struct thermal_zone_device *tz,
 473                                             u32 *min_power)
 474 { return -ENODEV; }
 475 static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
 476                           struct thermal_instance *tz, u32 power)
 477 { return 0; }
 478 static inline struct thermal_zone_device *thermal_zone_device_register(
 479         const char *type, int trips, int mask, void *devdata,
 480         struct thermal_zone_device_ops *ops,
 481         struct thermal_zone_params *tzp,
 482         int passive_delay, int polling_delay)
 483 { return ERR_PTR(-ENODEV); }
 484 static inline void thermal_zone_device_unregister(
 485         struct thermal_zone_device *tz)
 486 { }
 487 static inline int thermal_zone_bind_cooling_device(
 488         struct thermal_zone_device *tz, int trip,
 489         struct thermal_cooling_device *cdev,
 490         unsigned long upper, unsigned long lower,
 491         unsigned int weight)
 492 { return -ENODEV; }
 493 static inline int thermal_zone_unbind_cooling_device(
 494         struct thermal_zone_device *tz, int trip,
 495         struct thermal_cooling_device *cdev)
 496 { return -ENODEV; }
 497 static inline void thermal_zone_device_update(struct thermal_zone_device *tz,
 498                                               enum thermal_notify_event event)
 499 { }
 500 static inline void thermal_zone_set_trips(struct thermal_zone_device *tz)
 501 { }
 502 static inline struct thermal_cooling_device *
 503 thermal_cooling_device_register(char *type, void *devdata,
 504         const struct thermal_cooling_device_ops *ops)
 505 { return ERR_PTR(-ENODEV); }
 506 static inline struct thermal_cooling_device *
 507 thermal_of_cooling_device_register(struct device_node *np,
 508         char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 509 { return ERR_PTR(-ENODEV); }
 510 static inline struct thermal_cooling_device *
 511 devm_thermal_of_cooling_device_register(struct device *dev,
 512                                 struct device_node *np,
 513                                 char *type, void *devdata,
 514                                 const struct thermal_cooling_device_ops *ops)
 515 {
 516         return ERR_PTR(-ENODEV);
 517 }
 518 static inline void thermal_cooling_device_unregister(
 519         struct thermal_cooling_device *cdev)
 520 { }
 521 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
 522                 const char *name)
 523 { return ERR_PTR(-ENODEV); }
 524 static inline int thermal_zone_get_temp(
 525                 struct thermal_zone_device *tz, int *temp)
 526 { return -ENODEV; }
 527 static inline int thermal_zone_get_slope(
 528                 struct thermal_zone_device *tz)
 529 { return -ENODEV; }
 530 static inline int thermal_zone_get_offset(
 531                 struct thermal_zone_device *tz)
 532 { return -ENODEV; }
 533 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
 534 { return -ENODEV; }
 535 static inline struct thermal_instance *
 536 get_thermal_instance(struct thermal_zone_device *tz,
 537         struct thermal_cooling_device *cdev, int trip)
 538 { return ERR_PTR(-ENODEV); }
 539 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
 540 { }
 541 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
 542         int trip)
 543 { }
 544 #endif /* CONFIG_THERMAL */
 545
 546 #endif /* __THERMAL_H__ */