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 /* Unit conversion macros */
  47 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732 >= 0) ?    \
  48                                 ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  49 #define CELSIUS_TO_KELVIN(t)    ((t)*10+2732)
  50 #define DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, off) (((t) - (off)) * 100)
  51 #define DECI_KELVIN_TO_MILLICELSIUS(t) DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, 2732)
  52 #define MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, off) (((t) / 100) + (off))
  53 #define MILLICELSIUS_TO_DECI_KELVIN(t) MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, 2732)
  54
  55 /* Default Thermal Governor */
  56 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
  57 #define DEFAULT_THERMAL_GOVERNOR       "step_wise"
  58 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
  59 #define DEFAULT_THERMAL_GOVERNOR       "fair_share"
  60 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
  61 #define DEFAULT_THERMAL_GOVERNOR       "user_space"
  62 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR)
  63 #define DEFAULT_THERMAL_GOVERNOR       "power_allocator"
  64 #endif
  65
  66 struct thermal_zone_device;
  67 struct thermal_cooling_device;
  68 struct thermal_instance;
  69
  70 enum thermal_device_mode {
  71         THERMAL_DEVICE_DISABLED = 0,
  72         THERMAL_DEVICE_ENABLED,
  73 };
  74
  75 enum thermal_trip_type {
  76         THERMAL_TRIP_ACTIVE = 0,
  77         THERMAL_TRIP_PASSIVE,
  78         THERMAL_TRIP_HOT,
  79         THERMAL_TRIP_CRITICAL,
  80 };
  81
  82 enum thermal_trend {
  83         THERMAL_TREND_STABLE, /* temperature is stable */
  84         THERMAL_TREND_RAISING, /* temperature is raising */
  85         THERMAL_TREND_DROPPING, /* temperature is dropping */
  86         THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
  87         THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
  88 };
  89
  90 struct thermal_zone_device_ops {
  91         int (*bind) (struct thermal_zone_device *,
  92                      struct thermal_cooling_device *);
  93         int (*unbind) (struct thermal_zone_device *,
  94                        struct thermal_cooling_device *);
  95         int (*get_temp) (struct thermal_zone_device *, unsigned long *);
  96         int (*get_mode) (struct thermal_zone_device *,
  97                          enum thermal_device_mode *);
  98         int (*set_mode) (struct thermal_zone_device *,
  99                 enum thermal_device_mode);
 100         int (*get_trip_type) (struct thermal_zone_device *, int,
 101                 enum thermal_trip_type *);
 102         int (*get_trip_temp) (struct thermal_zone_device *, int,
 103                               unsigned long *);
 104         int (*set_trip_temp) (struct thermal_zone_device *, int,
 105                               unsigned long);
 106         int (*get_trip_hyst) (struct thermal_zone_device *, int,
 107                               unsigned long *);
 108         int (*set_trip_hyst) (struct thermal_zone_device *, int,
 109                               unsigned long);
 110         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
 111         int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
 112         int (*get_trend) (struct thermal_zone_device *, int,
 113                           enum thermal_trend *);
 114         int (*notify) (struct thermal_zone_device *, int,
 115                        enum thermal_trip_type);
 116 };
 117
 118 struct thermal_cooling_device_ops {
 119         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 120         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 121         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 122         int (*get_requested_power)(struct thermal_cooling_device *,
 123                                    struct thermal_zone_device *, u32 *);
 124         int (*state2power)(struct thermal_cooling_device *,
 125                            struct thermal_zone_device *, unsigned long, u32 *);
 126         int (*power2state)(struct thermal_cooling_device *,
 127                            struct thermal_zone_device *, u32, unsigned long *);
 128 };
 129
 130 struct thermal_cooling_device {
 131         int id;
 132         char type[THERMAL_NAME_LENGTH];
 133         struct device device;
 134         struct device_node *np;
 135         void *devdata;
 136         const struct thermal_cooling_device_ops *ops;
 137         bool updated; /* true if the cooling device does not need update */
 138         struct mutex lock; /* protect thermal_instances list */
 139         struct list_head thermal_instances;
 140         struct list_head node;
 141 };
 142
 143 struct thermal_attr {
 144         struct device_attribute attr;
 145         char name[THERMAL_NAME_LENGTH];
 146 };
 147
 148 /**
 149  * struct thermal_zone_device - structure for a thermal zone
 150  * @id:         unique id number for each thermal zone
 151  * @type:       the thermal zone device type
 152  * @device:     &struct device for this thermal zone
 153  * @trip_temp_attrs:    attributes for trip points for sysfs: trip temperature
 154  * @trip_type_attrs:    attributes for trip points for sysfs: trip type
 155  * @trip_hyst_attrs:    attributes for trip points for sysfs: trip hysteresis
 156  * @devdata:    private pointer for device private data
 157  * @trips:      number of trip points the thermal zone supports
 158  * @passive_delay:      number of milliseconds to wait between polls when
 159  *                      performing passive cooling.
 160  * @polling_delay:      number of milliseconds to wait between polls when
 161  *                      checking whether trip points have been crossed (0 for
 162  *                      interrupt driven systems)
 163  * @temperature:        current temperature.  This is only for core code,
 164  *                      drivers should use thermal_zone_get_temp() to get the
 165  *                      current temperature
 166  * @last_temperature:   previous temperature read
 167  * @emul_temperature:   emulated temperature when using CONFIG_THERMAL_EMULATION
 168  * @passive:            1 if you've crossed a passive trip point, 0 otherwise.
 169  * @forced_passive:     If > 0, temperature at which to switch on all ACPI
 170  *                      processor cooling devices.  Currently only used by the
 171  *                      step-wise governor.
 172  * @ops:        operations this &thermal_zone_device supports
 173  * @tzp:        thermal zone parameters
 174  * @governor:   pointer to the governor for this thermal zone
 175  * @governor_data:      private pointer for governor data
 176  * @thermal_instances:  list of &struct thermal_instance of this thermal zone
 177  * @idr:        &struct idr to generate unique id for this zone's cooling
 178  *              devices
 179  * @lock:       lock to protect thermal_instances list
 180  * @node:       node in thermal_tz_list (in thermal_core.c)
 181  * @poll_queue: delayed work for polling
 182  */
 183 struct thermal_zone_device {
 184         int id;
 185         char type[THERMAL_NAME_LENGTH];
 186         struct device device;
 187         struct thermal_attr *trip_temp_attrs;
 188         struct thermal_attr *trip_type_attrs;
 189         struct thermal_attr *trip_hyst_attrs;
 190         void *devdata;
 191         int trips;
 192         int passive_delay;
 193         int polling_delay;
 194         int temperature;
 195         int last_temperature;
 196         int emul_temperature;
 197         int passive;
 198         unsigned int forced_passive;
 199         struct thermal_zone_device_ops *ops;
 200         struct thermal_zone_params *tzp;
 201         struct thermal_governor *governor;
 202         void *governor_data;
 203         struct list_head thermal_instances;
 204         struct idr idr;
 205         struct mutex lock;
 206         struct list_head node;
 207         struct delayed_work poll_queue;
 208 };
 209
 210 /**
 211  * struct thermal_governor - structure that holds thermal governor information
 212  * @name:       name of the governor
 213  * @bind_to_tz: callback called when binding to a thermal zone.  If it
 214  *              returns 0, the governor is bound to the thermal zone,
 215  *              otherwise it fails.
 216  * @unbind_from_tz:     callback called when a governor is unbound from a
 217  *                      thermal zone.
 218  * @throttle:   callback called for every trip point even if temperature is
 219  *              below the trip point temperature
 220  * @governor_list:      node in thermal_governor_list (in thermal_core.c)
 221  */
 222 struct thermal_governor {
 223         char name[THERMAL_NAME_LENGTH];
 224         int (*bind_to_tz)(struct thermal_zone_device *tz);
 225         void (*unbind_from_tz)(struct thermal_zone_device *tz);
 226         int (*throttle)(struct thermal_zone_device *tz, int trip);
 227         struct list_head        governor_list;
 228 };
 229
 230 /* Structure that holds binding parameters for a zone */
 231 struct thermal_bind_params {
 232         struct thermal_cooling_device *cdev;
 233
 234         /*
 235          * This is a measure of 'how effectively these devices can
 236          * cool 'this' thermal zone. It shall be determined by
 237          * platform characterization. This value is relative to the
 238          * rest of the weights so a cooling device whose weight is
 239          * double that of another cooling device is twice as
 240          * effective. See Documentation/thermal/sysfs-api.txt for more
 241          * information.
 242          */
 243         int weight;
 244
 245         /*
 246          * This is a bit mask that gives the binding relation between this
 247          * thermal zone and cdev, for a particular trip point.
 248          * See Documentation/thermal/sysfs-api.txt for more information.
 249          */
 250         int trip_mask;
 251
 252         /*
 253          * This is an array of cooling state limits. Must have exactly
 254          * 2 * thermal_zone.number_of_trip_points. It is an array consisting
 255          * of tuples <lower-state upper-state> of state limits. Each trip
 256          * will be associated with one state limit tuple when binding.
 257          * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
 258          * on all trips.
 259          */
 260         unsigned long *binding_limits;
 261         int (*match) (struct thermal_zone_device *tz,
 262                         struct thermal_cooling_device *cdev);
 263 };
 264
 265 /* Structure to define Thermal Zone parameters */
 266 struct thermal_zone_params {
 267         char governor_name[THERMAL_NAME_LENGTH];
 268
 269         /*
 270          * a boolean to indicate if the thermal to hwmon sysfs interface
 271          * is required. when no_hwmon == false, a hwmon sysfs interface
 272          * will be created. when no_hwmon == true, nothing will be done
 273          */
 274         bool no_hwmon;
 275
 276         int num_tbps;   /* Number of tbp entries */
 277         struct thermal_bind_params *tbp;
 278
 279         /*
 280          * Sustainable power (heat) that this thermal zone can dissipate in
 281          * mW
 282          */
 283         u32 sustainable_power;
 284
 285         /*
 286          * Proportional parameter of the PID controller when
 287          * overshooting (i.e., when temperature is below the target)
 288          */
 289         s32 k_po;
 290
 291         /*
 292          * Proportional parameter of the PID controller when
 293          * undershooting
 294          */
 295         s32 k_pu;
 296
 297         /* Integral parameter of the PID controller */
 298         s32 k_i;
 299
 300         /* Derivative parameter of the PID controller */
 301         s32 k_d;
 302
 303         /* threshold below which the error is no longer accumulated */
 304         s32 integral_cutoff;
 305
 306         /*
 307          * @slope:      slope of a linear temperature adjustment curve.
 308          *              Used by thermal zone drivers.
 309          */
 310         int slope;
 311         /*
 312          * @offset:     offset of a linear temperature adjustment curve.
 313          *              Used by thermal zone drivers (default 0).
 314          */
 315         int offset;
 316 };
 317
 318 struct thermal_genl_event {
 319         u32 orig;
 320         enum events event;
 321 };
 322
 323 /**
 324  * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
 325  *
 326  * Mandatory:
 327  * @get_temp: a pointer to a function that reads the sensor temperature.
 328  *
 329  * Optional:
 330  * @get_trend: a pointer to a function that reads the sensor temperature trend.
 331  * @set_emul_temp: a pointer to a function that sets sensor emulated
 332  *                 temperature.
 333  */
 334 struct thermal_zone_of_device_ops {
 335         int (*get_temp)(void *, long *);
 336         int (*get_trend)(void *, long *);
 337         int (*set_emul_temp)(void *, unsigned long);
 338 };
 339
 340 /**
 341  * struct thermal_trip - representation of a point in temperature domain
 342  * @np: pointer to struct device_node that this trip point was created from
 343  * @temperature: temperature value in miliCelsius
 344  * @hysteresis: relative hysteresis in miliCelsius
 345  * @type: trip point type
 346  */
 347
 348 struct thermal_trip {
 349         struct device_node *np;
 350         unsigned long int temperature;
 351         unsigned long int hysteresis;
 352         enum thermal_trip_type type;
 353 };
 354
 355 /* Function declarations */
 356 #ifdef CONFIG_THERMAL_OF
 357 struct thermal_zone_device *
 358 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 359                                 const struct thermal_zone_of_device_ops *ops);
 360 void thermal_zone_of_sensor_unregister(struct device *dev,
 361                                        struct thermal_zone_device *tz);
 362 #else
 363 static inline struct thermal_zone_device *
 364 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 365                                 const struct thermal_zone_of_device_ops *ops)
 366 {
 367         return NULL;
 368 }
 369
 370 static inline
 371 void thermal_zone_of_sensor_unregister(struct device *dev,
 372                                        struct thermal_zone_device *tz)
 373 {
 374 }
 375
 376 #endif
 377
 378 #if IS_ENABLED(CONFIG_THERMAL)
 379 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 380 {
 381         return cdev->ops->get_requested_power && cdev->ops->state2power &&
 382                 cdev->ops->power2state;
 383 }
 384
 385 int power_actor_get_max_power(struct thermal_cooling_device *,
 386                               struct thermal_zone_device *tz, u32 *max_power);
 387 int power_actor_set_power(struct thermal_cooling_device *,
 388                           struct thermal_instance *, u32);
 389 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 390                 void *, struct thermal_zone_device_ops *,
 391                 struct thermal_zone_params *, int, int);
 392 void thermal_zone_device_unregister(struct thermal_zone_device *);
 393
 394 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 395                                      struct thermal_cooling_device *,
 396                                      unsigned long, unsigned long,
 397                                      unsigned int);
 398 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 399                                        struct thermal_cooling_device *);
 400 void thermal_zone_device_update(struct thermal_zone_device *);
 401
 402 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 403                 const struct thermal_cooling_device_ops *);
 404 struct thermal_cooling_device *
 405 thermal_of_cooling_device_register(struct device_node *np, char *, void *,
 406                                    const struct thermal_cooling_device_ops *);
 407 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 408 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
 409 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp);
 410
 411 int get_tz_trend(struct thermal_zone_device *, int);
 412 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 413                 struct thermal_cooling_device *, int);
 414 void thermal_cdev_update(struct thermal_cooling_device *);
 415 void thermal_notify_framework(struct thermal_zone_device *, int);
 416 #else
 417 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 418 { return false; }
 419 static inline int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 420                               struct thermal_zone_device *tz, u32 *max_power)
 421 { return 0; }
 422 static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
 423                           struct thermal_instance *tz, u32 power)
 424 { return 0; }
 425 static inline struct thermal_zone_device *thermal_zone_device_register(
 426         const char *type, int trips, int mask, void *devdata,
 427         struct thermal_zone_device_ops *ops,
 428         const struct thermal_zone_params *tzp,
 429         int passive_delay, int polling_delay)
 430 { return ERR_PTR(-ENODEV); }
 431 static inline void thermal_zone_device_unregister(
 432         struct thermal_zone_device *tz)
 433 { }
 434 static inline int thermal_zone_bind_cooling_device(
 435         struct thermal_zone_device *tz, int trip,
 436         struct thermal_cooling_device *cdev,
 437         unsigned long upper, unsigned long lower)
 438 { return -ENODEV; }
 439 static inline int thermal_zone_unbind_cooling_device(
 440         struct thermal_zone_device *tz, int trip,
 441         struct thermal_cooling_device *cdev)
 442 { return -ENODEV; }
 443 static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
 444 { }
 445 static inline struct thermal_cooling_device *
 446 thermal_cooling_device_register(char *type, void *devdata,
 447         const struct thermal_cooling_device_ops *ops)
 448 { return ERR_PTR(-ENODEV); }
 449 static inline struct thermal_cooling_device *
 450 thermal_of_cooling_device_register(struct device_node *np,
 451         char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 452 { return ERR_PTR(-ENODEV); }
 453 static inline void thermal_cooling_device_unregister(
 454         struct thermal_cooling_device *cdev)
 455 { }
 456 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
 457                 const char *name)
 458 { return ERR_PTR(-ENODEV); }
 459 static inline int thermal_zone_get_temp(
 460                 struct thermal_zone_device *tz, unsigned long *temp)
 461 { return -ENODEV; }
 462 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
 463 { return -ENODEV; }
 464 static inline struct thermal_instance *
 465 get_thermal_instance(struct thermal_zone_device *tz,
 466         struct thermal_cooling_device *cdev, int trip)
 467 { return ERR_PTR(-ENODEV); }
 468 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
 469 { }
 470 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
 471         int trip)
 472 { }
 473 #endif /* CONFIG_THERMAL */
 474
 475 #if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
 476 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 477                                                 enum events event);
 478 #else
 479 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 480                                                 enum events event)
 481 {
 482         return 0;
 483 }
 484 #endif
 485
 486 #endif /* __THERMAL_H__ */