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  * @passive_delay:      number of milliseconds to wait between polls when
 160  *                      performing passive cooling.
 161  * @polling_delay:      number of milliseconds to wait between polls when
 162  *                      checking whether trip points have been crossed (0 for
 163  *                      interrupt driven systems)
 164  * @temperature:        current temperature.  This is only for core code,
 165  *                      drivers should use thermal_zone_get_temp() to get the
 166  *                      current temperature
 167  * @last_temperature:   previous temperature read
 168  * @emul_temperature:   emulated temperature when using CONFIG_THERMAL_EMULATION
 169  * @passive:            1 if you've crossed a passive trip point, 0 otherwise.
 170  * @forced_passive:     If > 0, temperature at which to switch on all ACPI
 171  *                      processor cooling devices.  Currently only used by the
 172  *                      step-wise governor.
 173  * @need_update:        if equals 1, thermal_zone_device_update needs to be invoked.
 174  * @ops:        operations this &thermal_zone_device supports
 175  * @tzp:        thermal zone parameters
 176  * @governor:   pointer to the governor for this thermal zone
 177  * @governor_data:      private pointer for governor data
 178  * @thermal_instances:  list of &struct thermal_instance of this thermal zone
 179  * @idr:        &struct idr to generate unique id for this zone's cooling
 180  *              devices
 181  * @lock:       lock to protect thermal_instances list
 182  * @node:       node in thermal_tz_list (in thermal_core.c)
 183  * @poll_queue: delayed work for polling
 184  */
 185 struct thermal_zone_device {
 186         int id;
 187         char type[THERMAL_NAME_LENGTH];
 188         struct device device;
 189         struct thermal_attr *trip_temp_attrs;
 190         struct thermal_attr *trip_type_attrs;
 191         struct thermal_attr *trip_hyst_attrs;
 192         void *devdata;
 193         int trips;
 194         int passive_delay;
 195         int polling_delay;
 196         int temperature;
 197         int last_temperature;
 198         int emul_temperature;
 199         int passive;
 200         unsigned int forced_passive;
 201         atomic_t need_update;
 202         struct thermal_zone_device_ops *ops;
 203         struct thermal_zone_params *tzp;
 204         struct thermal_governor *governor;
 205         void *governor_data;
 206         struct list_head thermal_instances;
 207         struct idr idr;
 208         struct mutex lock;
 209         struct list_head node;
 210         struct delayed_work poll_queue;
 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/thermal/sysfs-api.txt 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/thermal/sysfs-api.txt 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_emul_temp: a pointer to a function that sets sensor emulated
 335  *                 temperature.
 336  */
 337 struct thermal_zone_of_device_ops {
 338         int (*get_temp)(void *, int *);
 339         int (*get_trend)(void *, long *);
 340         int (*set_emul_temp)(void *, int);
 341 };
 342
 343 /**
 344  * struct thermal_trip - representation of a point in temperature domain
 345  * @np: pointer to struct device_node that this trip point was created from
 346  * @temperature: temperature value in miliCelsius
 347  * @hysteresis: relative hysteresis in miliCelsius
 348  * @type: trip point type
 349  */
 350
 351 struct thermal_trip {
 352         struct device_node *np;
 353         unsigned long int temperature;
 354         unsigned long int hysteresis;
 355         enum thermal_trip_type type;
 356 };
 357
 358 /* Function declarations */
 359 #ifdef CONFIG_THERMAL_OF
 360 struct thermal_zone_device *
 361 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 362                                 const struct thermal_zone_of_device_ops *ops);
 363 void thermal_zone_of_sensor_unregister(struct device *dev,
 364                                        struct thermal_zone_device *tz);
 365 #else
 366 static inline struct thermal_zone_device *
 367 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 368                                 const struct thermal_zone_of_device_ops *ops)
 369 {
 370         return ERR_PTR(-ENODEV);
 371 }
 372
 373 static inline
 374 void thermal_zone_of_sensor_unregister(struct device *dev,
 375                                        struct thermal_zone_device *tz)
 376 {
 377 }
 378
 379 #endif
 380
 381 #if IS_ENABLED(CONFIG_THERMAL)
 382 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 383 {
 384         return cdev->ops->get_requested_power && cdev->ops->state2power &&
 385                 cdev->ops->power2state;
 386 }
 387
 388 int power_actor_get_max_power(struct thermal_cooling_device *,
 389                               struct thermal_zone_device *tz, u32 *max_power);
 390 int power_actor_get_min_power(struct thermal_cooling_device *,
 391                               struct thermal_zone_device *tz, u32 *min_power);
 392 int power_actor_set_power(struct thermal_cooling_device *,
 393                           struct thermal_instance *, u32);
 394 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 395                 void *, struct thermal_zone_device_ops *,
 396                 struct thermal_zone_params *, int, int);
 397 void thermal_zone_device_unregister(struct thermal_zone_device *);
 398
 399 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 400                                      struct thermal_cooling_device *,
 401                                      unsigned long, unsigned long,
 402                                      unsigned int);
 403 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 404                                        struct thermal_cooling_device *);
 405 void thermal_zone_device_update(struct thermal_zone_device *);
 406
 407 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 408                 const struct thermal_cooling_device_ops *);
 409 struct thermal_cooling_device *
 410 thermal_of_cooling_device_register(struct device_node *np, char *, void *,
 411                                    const struct thermal_cooling_device_ops *);
 412 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 413 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
 414 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
 415
 416 int get_tz_trend(struct thermal_zone_device *, int);
 417 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 418                 struct thermal_cooling_device *, int);
 419 void thermal_cdev_update(struct thermal_cooling_device *);
 420 void thermal_notify_framework(struct thermal_zone_device *, int);
 421 #else
 422 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 423 { return false; }
 424 static inline int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 425                               struct thermal_zone_device *tz, u32 *max_power)
 426 { return 0; }
 427 static inline int power_actor_get_min_power(struct thermal_cooling_device *cdev,
 428                                             struct thermal_zone_device *tz,
 429                                             u32 *min_power)
 430 { return -ENODEV; }
 431 static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
 432                           struct thermal_instance *tz, u32 power)
 433 { return 0; }
 434 static inline struct thermal_zone_device *thermal_zone_device_register(
 435         const char *type, int trips, int mask, void *devdata,
 436         struct thermal_zone_device_ops *ops,
 437         const struct thermal_zone_params *tzp,
 438         int passive_delay, int polling_delay)
 439 { return ERR_PTR(-ENODEV); }
 440 static inline void thermal_zone_device_unregister(
 441         struct thermal_zone_device *tz)
 442 { }
 443 static inline int thermal_zone_bind_cooling_device(
 444         struct thermal_zone_device *tz, int trip,
 445         struct thermal_cooling_device *cdev,
 446         unsigned long upper, unsigned long lower,
 447         unsigned int weight)
 448 { return -ENODEV; }
 449 static inline int thermal_zone_unbind_cooling_device(
 450         struct thermal_zone_device *tz, int trip,
 451         struct thermal_cooling_device *cdev)
 452 { return -ENODEV; }
 453 static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
 454 { }
 455 static inline struct thermal_cooling_device *
 456 thermal_cooling_device_register(char *type, void *devdata,
 457         const struct thermal_cooling_device_ops *ops)
 458 { return ERR_PTR(-ENODEV); }
 459 static inline struct thermal_cooling_device *
 460 thermal_of_cooling_device_register(struct device_node *np,
 461         char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 462 { return ERR_PTR(-ENODEV); }
 463 static inline void thermal_cooling_device_unregister(
 464         struct thermal_cooling_device *cdev)
 465 { }
 466 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
 467                 const char *name)
 468 { return ERR_PTR(-ENODEV); }
 469 static inline int thermal_zone_get_temp(
 470                 struct thermal_zone_device *tz, int *temp)
 471 { return -ENODEV; }
 472 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
 473 { return -ENODEV; }
 474 static inline struct thermal_instance *
 475 get_thermal_instance(struct thermal_zone_device *tz,
 476         struct thermal_cooling_device *cdev, int trip)
 477 { return ERR_PTR(-ENODEV); }
 478 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
 479 { }
 480 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
 481         int trip)
 482 { }
 483 #endif /* CONFIG_THERMAL */
 484
 485 #if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
 486 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 487                                                 enum events event);
 488 #else
 489 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 490                                                 enum events event)
 491 {
 492         return 0;
 493 }
 494 #endif
 495
 496 #endif /* __THERMAL_H__ */