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 (*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__ */