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