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 DECI_KELVIN_TO_CELSIUS(t)       ({                      \
  48         long _t = (t);                                          \
  49         ((_t-2732 >= 0) ? (_t-2732+5)/10 : (_t-2732-5)/10);     \
  50 })
  51 #define CELSIUS_TO_DECI_KELVIN(t)       ((t)*10+2732)
  52 #define DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, off) (((t) - (off)) * 100)
  53 #define DECI_KELVIN_TO_MILLICELSIUS(t) DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, 2732)
  54 #define MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, off) (((t) / 100) + (off))
  55 #define MILLICELSIUS_TO_DECI_KELVIN(t) MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, 2732)
  56
  57 /* Default Thermal Governor */
  58 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
  59 #define DEFAULT_THERMAL_GOVERNOR       "step_wise"
  60 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
  61 #define DEFAULT_THERMAL_GOVERNOR       "fair_share"
  62 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
  63 #define DEFAULT_THERMAL_GOVERNOR       "user_space"
  64 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR)
  65 #define DEFAULT_THERMAL_GOVERNOR       "power_allocator"
  66 #endif
  67
  68 struct thermal_zone_device;
  69 struct thermal_cooling_device;
  70 struct thermal_instance;
  71
  72 enum thermal_device_mode {
  73         THERMAL_DEVICE_DISABLED = 0,
  74         THERMAL_DEVICE_ENABLED,
  75 };
  76
  77 enum thermal_trip_type {
  78         THERMAL_TRIP_ACTIVE = 0,
  79         THERMAL_TRIP_PASSIVE,
  80         THERMAL_TRIP_HOT,
  81         THERMAL_TRIP_CRITICAL,
  82 };
  83
  84 enum thermal_trend {
  85         THERMAL_TREND_STABLE, /* temperature is stable */
  86         THERMAL_TREND_RAISING, /* temperature is raising */
  87         THERMAL_TREND_DROPPING, /* temperature is dropping */
  88         THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
  89         THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
  90 };
  91
  92 struct thermal_zone_device_ops {
  93         int (*bind) (struct thermal_zone_device *,
  94                      struct thermal_cooling_device *);
  95         int (*unbind) (struct thermal_zone_device *,
  96                        struct thermal_cooling_device *);
  97         int (*get_temp) (struct thermal_zone_device *, int *);
  98         int (*get_mode) (struct thermal_zone_device *,
  99                          enum thermal_device_mode *);
 100         int (*set_mode) (struct thermal_zone_device *,
 101                 enum thermal_device_mode);
 102         int (*get_trip_type) (struct thermal_zone_device *, int,
 103                 enum thermal_trip_type *);
 104         int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
 105         int (*set_trip_temp) (struct thermal_zone_device *, int, int);
 106         int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
 107         int (*set_trip_hyst) (struct thermal_zone_device *, int, int);
 108         int (*get_crit_temp) (struct thermal_zone_device *, int *);
 109         int (*set_emul_temp) (struct thermal_zone_device *, int);
 110         int (*get_trend) (struct thermal_zone_device *, int,
 111                           enum thermal_trend *);
 112         int (*notify) (struct thermal_zone_device *, int,
 113                        enum thermal_trip_type);
 114 };
 115
 116 struct thermal_cooling_device_ops {
 117         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 118         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 119         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 120         int (*get_requested_power)(struct thermal_cooling_device *,
 121                                    struct thermal_zone_device *, u32 *);
 122         int (*state2power)(struct thermal_cooling_device *,
 123                            struct thermal_zone_device *, unsigned long, u32 *);
 124         int (*power2state)(struct thermal_cooling_device *,
 125                            struct thermal_zone_device *, u32, unsigned long *);
 126 };
 127
 128 struct thermal_cooling_device {
 129         int id;
 130         char type[THERMAL_NAME_LENGTH];
 131         struct device device;
 132         struct device_node *np;
 133         void *devdata;
 134         const struct thermal_cooling_device_ops *ops;
 135         bool updated; /* true if the cooling device does not need update */
 136         struct mutex lock; /* protect thermal_instances list */
 137         struct list_head thermal_instances;
 138         struct list_head node;
 139 };
 140
 141 struct thermal_attr {
 142         struct device_attribute attr;
 143         char name[THERMAL_NAME_LENGTH];
 144 };
 145
 146 /**
 147  * struct thermal_zone_device - structure for a thermal zone
 148  * @id:         unique id number for each thermal zone
 149  * @type:       the thermal zone device type
 150  * @device:     &struct device for this thermal zone
 151  * @trip_temp_attrs:    attributes for trip points for sysfs: trip temperature
 152  * @trip_type_attrs:    attributes for trip points for sysfs: trip type
 153  * @trip_hyst_attrs:    attributes for trip points for sysfs: trip hysteresis
 154  * @devdata:    private pointer for device private data
 155  * @trips:      number of trip points the thermal zone supports
 156  * @passive_delay:      number of milliseconds to wait between polls when
 157  *                      performing passive cooling.
 158  * @polling_delay:      number of milliseconds to wait between polls when
 159  *                      checking whether trip points have been crossed (0 for
 160  *                      interrupt driven systems)
 161  * @temperature:        current temperature.  This is only for core code,
 162  *                      drivers should use thermal_zone_get_temp() to get the
 163  *                      current temperature
 164  * @last_temperature:   previous temperature read
 165  * @emul_temperature:   emulated temperature when using CONFIG_THERMAL_EMULATION
 166  * @passive:            1 if you've crossed a passive trip point, 0 otherwise.
 167  * @forced_passive:     If > 0, temperature at which to switch on all ACPI
 168  *                      processor cooling devices.  Currently only used by the
 169  *                      step-wise governor.
 170  * @ops:        operations this &thermal_zone_device supports
 171  * @tzp:        thermal zone parameters
 172  * @governor:   pointer to the governor for this thermal zone
 173  * @governor_data:      private pointer for governor data
 174  * @thermal_instances:  list of &struct thermal_instance of this thermal zone
 175  * @idr:        &struct idr to generate unique id for this zone's cooling
 176  *              devices
 177  * @lock:       lock to protect thermal_instances list
 178  * @node:       node in thermal_tz_list (in thermal_core.c)
 179  * @poll_queue: delayed work for polling
 180  */
 181 struct thermal_zone_device {
 182         int id;
 183         char type[THERMAL_NAME_LENGTH];
 184         struct device device;
 185         struct thermal_attr *trip_temp_attrs;
 186         struct thermal_attr *trip_type_attrs;
 187         struct thermal_attr *trip_hyst_attrs;
 188         void *devdata;
 189         int trips;
 190         int passive_delay;
 191         int polling_delay;
 192         int temperature;
 193         int last_temperature;
 194         int emul_temperature;
 195         int passive;
 196         unsigned int forced_passive;
 197         struct thermal_zone_device_ops *ops;
 198         struct thermal_zone_params *tzp;
 199         struct thermal_governor *governor;
 200         void *governor_data;
 201         struct list_head thermal_instances;
 202         struct idr idr;
 203         struct mutex lock;
 204         struct list_head node;
 205         struct delayed_work poll_queue;
 206 };
 207
 208 /**
 209  * struct thermal_governor - structure that holds thermal governor information
 210  * @name:       name of the governor
 211  * @bind_to_tz: callback called when binding to a thermal zone.  If it
 212  *              returns 0, the governor is bound to the thermal zone,
 213  *              otherwise it fails.
 214  * @unbind_from_tz:     callback called when a governor is unbound from a
 215  *                      thermal zone.
 216  * @throttle:   callback called for every trip point even if temperature is
 217  *              below the trip point temperature
 218  * @governor_list:      node in thermal_governor_list (in thermal_core.c)
 219  */
 220 struct thermal_governor {
 221         char name[THERMAL_NAME_LENGTH];
 222         int (*bind_to_tz)(struct thermal_zone_device *tz);
 223         void (*unbind_from_tz)(struct thermal_zone_device *tz);
 224         int (*throttle)(struct thermal_zone_device *tz, int trip);
 225         struct list_head        governor_list;
 226 };
 227
 228 /* Structure that holds binding parameters for a zone */
 229 struct thermal_bind_params {
 230         struct thermal_cooling_device *cdev;
 231
 232         /*
 233          * This is a measure of 'how effectively these devices can
 234          * cool 'this' thermal zone. It shall be determined by
 235          * platform characterization. This value is relative to the
 236          * rest of the weights so a cooling device whose weight is
 237          * double that of another cooling device is twice as
 238          * effective. See Documentation/thermal/sysfs-api.txt for more
 239          * information.
 240          */
 241         int weight;
 242
 243         /*
 244          * This is a bit mask that gives the binding relation between this
 245          * thermal zone and cdev, for a particular trip point.
 246          * See Documentation/thermal/sysfs-api.txt for more information.
 247          */
 248         int trip_mask;
 249
 250         /*
 251          * This is an array of cooling state limits. Must have exactly
 252          * 2 * thermal_zone.number_of_trip_points. It is an array consisting
 253          * of tuples <lower-state upper-state> of state limits. Each trip
 254          * will be associated with one state limit tuple when binding.
 255          * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
 256          * on all trips.
 257          */
 258         unsigned long *binding_limits;
 259         int (*match) (struct thermal_zone_device *tz,
 260                         struct thermal_cooling_device *cdev);
 261 };
 262
 263 /* Structure to define Thermal Zone parameters */
 264 struct thermal_zone_params {
 265         char governor_name[THERMAL_NAME_LENGTH];
 266
 267         /*
 268          * a boolean to indicate if the thermal to hwmon sysfs interface
 269          * is required. when no_hwmon == false, a hwmon sysfs interface
 270          * will be created. when no_hwmon == true, nothing will be done
 271          */
 272         bool no_hwmon;
 273
 274         int num_tbps;   /* Number of tbp entries */
 275         struct thermal_bind_params *tbp;
 276
 277         /*
 278          * Sustainable power (heat) that this thermal zone can dissipate in
 279          * mW
 280          */
 281         u32 sustainable_power;
 282
 283         /*
 284          * Proportional parameter of the PID controller when
 285          * overshooting (i.e., when temperature is below the target)
 286          */
 287         s32 k_po;
 288
 289         /*
 290          * Proportional parameter of the PID controller when
 291          * undershooting
 292          */
 293         s32 k_pu;
 294
 295         /* Integral parameter of the PID controller */
 296         s32 k_i;
 297
 298         /* Derivative parameter of the PID controller */
 299         s32 k_d;
 300
 301         /* threshold below which the error is no longer accumulated */
 302         s32 integral_cutoff;
 303
 304         /*
 305          * @slope:      slope of a linear temperature adjustment curve.
 306          *              Used by thermal zone drivers.
 307          */
 308         int slope;
 309         /*
 310          * @offset:     offset of a linear temperature adjustment curve.
 311          *              Used by thermal zone drivers (default 0).
 312          */
 313         int offset;
 314 };
 315
 316 struct thermal_genl_event {
 317         u32 orig;
 318         enum events event;
 319 };
 320
 321 /**
 322  * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
 323  *
 324  * Mandatory:
 325  * @get_temp: a pointer to a function that reads the sensor temperature.
 326  *
 327  * Optional:
 328  * @get_trend: a pointer to a function that reads the sensor temperature trend.
 329  * @set_emul_temp: a pointer to a function that sets sensor emulated
 330  *                 temperature.
 331  */
 332 struct thermal_zone_of_device_ops {
 333         int (*get_temp)(void *, int *);
 334         int (*get_trend)(void *, long *);
 335         int (*set_emul_temp)(void *, int);
 336 };
 337
 338 /**
 339  * struct thermal_trip - representation of a point in temperature domain
 340  * @np: pointer to struct device_node that this trip point was created from
 341  * @temperature: temperature value in miliCelsius
 342  * @hysteresis: relative hysteresis in miliCelsius
 343  * @type: trip point type
 344  */
 345
 346 struct thermal_trip {
 347         struct device_node *np;
 348         unsigned long int temperature;
 349         unsigned long int hysteresis;
 350         enum thermal_trip_type type;
 351 };
 352
 353 /* Function declarations */
 354 #ifdef CONFIG_THERMAL_OF
 355 struct thermal_zone_device *
 356 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 357                                 const struct thermal_zone_of_device_ops *ops);
 358 void thermal_zone_of_sensor_unregister(struct device *dev,
 359                                        struct thermal_zone_device *tz);
 360 #else
 361 static inline struct thermal_zone_device *
 362 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 363                                 const struct thermal_zone_of_device_ops *ops)
 364 {
 365         return ERR_PTR(-ENODEV);
 366 }
 367
 368 static inline
 369 void thermal_zone_of_sensor_unregister(struct device *dev,
 370                                        struct thermal_zone_device *tz)
 371 {
 372 }
 373
 374 #endif
 375
 376 #if IS_ENABLED(CONFIG_THERMAL)
 377 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 378 {
 379         return cdev->ops->get_requested_power && cdev->ops->state2power &&
 380                 cdev->ops->power2state;
 381 }
 382
 383 int power_actor_get_max_power(struct thermal_cooling_device *,
 384                               struct thermal_zone_device *tz, u32 *max_power);
 385 int power_actor_get_min_power(struct thermal_cooling_device *,
 386                               struct thermal_zone_device *tz, u32 *min_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, int *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_get_min_power(struct thermal_cooling_device *cdev,
 423                                             struct thermal_zone_device *tz,
 424                                             u32 *min_power)
 425 { return -ENODEV; }
 426 static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
 427                           struct thermal_instance *tz, u32 power)
 428 { return 0; }
 429 static inline struct thermal_zone_device *thermal_zone_device_register(
 430         const char *type, int trips, int mask, void *devdata,
 431         struct thermal_zone_device_ops *ops,
 432         const struct thermal_zone_params *tzp,
 433         int passive_delay, int polling_delay)
 434 { return ERR_PTR(-ENODEV); }
 435 static inline void thermal_zone_device_unregister(
 436         struct thermal_zone_device *tz)
 437 { }
 438 static inline int thermal_zone_bind_cooling_device(
 439         struct thermal_zone_device *tz, int trip,
 440         struct thermal_cooling_device *cdev,
 441         unsigned long upper, unsigned long lower)
 442 { return -ENODEV; }
 443 static inline int thermal_zone_unbind_cooling_device(
 444         struct thermal_zone_device *tz, int trip,
 445         struct thermal_cooling_device *cdev)
 446 { return -ENODEV; }
 447 static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
 448 { }
 449 static inline struct thermal_cooling_device *
 450 thermal_cooling_device_register(char *type, void *devdata,
 451         const struct thermal_cooling_device_ops *ops)
 452 { return ERR_PTR(-ENODEV); }
 453 static inline struct thermal_cooling_device *
 454 thermal_of_cooling_device_register(struct device_node *np,
 455         char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 456 { return ERR_PTR(-ENODEV); }
 457 static inline void thermal_cooling_device_unregister(
 458         struct thermal_cooling_device *cdev)
 459 { }
 460 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
 461                 const char *name)
 462 { return ERR_PTR(-ENODEV); }
 463 static inline int thermal_zone_get_temp(
 464                 struct thermal_zone_device *tz, int *temp)
 465 { return -ENODEV; }
 466 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
 467 { return -ENODEV; }
 468 static inline struct thermal_instance *
 469 get_thermal_instance(struct thermal_zone_device *tz,
 470         struct thermal_cooling_device *cdev, int trip)
 471 { return ERR_PTR(-ENODEV); }
 472 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
 473 { }
 474 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
 475         int trip)
 476 { }
 477 #endif /* CONFIG_THERMAL */
 478
 479 #if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
 480 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 481                                                 enum events event);
 482 #else
 483 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 484                                                 enum events event)
 485 {
 486         return 0;
 487 }
 488 #endif
 489
 490 #endif /* __THERMAL_H__ */