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