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/sysfs.h>
  32 #include <linux/workqueue.h>
  33 #include <uapi/linux/thermal.h>
  34
  35 #define THERMAL_TRIPS_NONE      -1
  36 #define THERMAL_MAX_TRIPS       12
  37
  38 /* invalid cooling state */
  39 #define THERMAL_CSTATE_INVALID -1UL
  40
  41 /* No upper/lower limit requirement */
  42 #define THERMAL_NO_LIMIT        ((u32)~0)
  43
  44 /* Default weight of a bound cooling device */
  45 #define THERMAL_WEIGHT_DEFAULT 0
  46
  47 /* use value, which < 0K, to indicate an invalid/uninitialized temperature */
  48 #define THERMAL_TEMP_INVALID    -274000
  49
  50 /* Unit conversion macros */
  51 #define DECI_KELVIN_TO_CELSIUS(t)       ({                      \
  52         long _t = (t);                                          \
  53         ((_t-2732 >= 0) ? (_t-2732+5)/10 : (_t-2732-5)/10);     \
  54 })
  55 #define CELSIUS_TO_DECI_KELVIN(t)       ((t)*10+2732)
  56 #define DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, off) (((t) - (off)) * 100)
  57 #define DECI_KELVIN_TO_MILLICELSIUS(t) DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, 2732)
  58 #define MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, off) (((t) / 100) + (off))
  59 #define MILLICELSIUS_TO_DECI_KELVIN(t) MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, 2732)
  60
  61 /* Default Thermal Governor */
  62 #if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
  63 #define DEFAULT_THERMAL_GOVERNOR       "step_wise"
  64 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
  65 #define DEFAULT_THERMAL_GOVERNOR       "fair_share"
  66 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
  67 #define DEFAULT_THERMAL_GOVERNOR       "user_space"
  68 #elif defined(CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR)
  69 #define DEFAULT_THERMAL_GOVERNOR       "power_allocator"
  70 #endif
  71
  72 struct thermal_zone_device;
  73 struct thermal_cooling_device;
  74 struct thermal_instance;
  75
  76 enum thermal_device_mode {
  77         THERMAL_DEVICE_DISABLED = 0,
  78         THERMAL_DEVICE_ENABLED,
  79 };
  80
  81 enum thermal_trip_type {
  82         THERMAL_TRIP_ACTIVE = 0,
  83         THERMAL_TRIP_PASSIVE,
  84         THERMAL_TRIP_HOT,
  85         THERMAL_TRIP_CRITICAL,
  86 };
  87
  88 enum thermal_trend {
  89         THERMAL_TREND_STABLE, /* temperature is stable */
  90         THERMAL_TREND_RAISING, /* temperature is raising */
  91         THERMAL_TREND_DROPPING, /* temperature is dropping */
  92         THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
  93         THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
  94 };
  95
  96 /* Thermal notification reason */
  97 enum thermal_notify_event {
  98         THERMAL_EVENT_UNSPECIFIED, /* Unspecified event */
  99         THERMAL_EVENT_TEMP_SAMPLE, /* New Temperature sample */
 100         THERMAL_TRIP_VIOLATED, /* TRIP Point violation */
 101         THERMAL_TRIP_CHANGED, /* TRIP Point temperature changed */
 102         THERMAL_DEVICE_DOWN, /* Thermal device is down */
 103         THERMAL_DEVICE_UP, /* Thermal device is up after a down event */
 104         THERMAL_DEVICE_POWER_CAPABILITY_CHANGED, /* power capability changed */
 105         THERMAL_TABLE_CHANGED, /* Thermal table(s) changed */
 106 };
 107
 108 struct thermal_zone_device_ops {
 109         int (*bind) (struct thermal_zone_device *,
 110                      struct thermal_cooling_device *);
 111         int (*unbind) (struct thermal_zone_device *,
 112                        struct thermal_cooling_device *);
 113         int (*get_temp) (struct thermal_zone_device *, int *);
 114         int (*set_trips) (struct thermal_zone_device *, int, int);
 115         int (*get_mode) (struct thermal_zone_device *,
 116                          enum thermal_device_mode *);
 117         int (*set_mode) (struct thermal_zone_device *,
 118                 enum thermal_device_mode);
 119         int (*get_trip_type) (struct thermal_zone_device *, int,
 120                 enum thermal_trip_type *);
 121         int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
 122         int (*set_trip_temp) (struct thermal_zone_device *, int, int);
 123         int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
 124         int (*set_trip_hyst) (struct thermal_zone_device *, int, int);
 125         int (*get_crit_temp) (struct thermal_zone_device *, int *);
 126         int (*set_emul_temp) (struct thermal_zone_device *, int);
 127         int (*get_trend) (struct thermal_zone_device *, int,
 128                           enum thermal_trend *);
 129         int (*notify) (struct thermal_zone_device *, int,
 130                        enum thermal_trip_type);
 131 };
 132
 133 struct thermal_cooling_device_ops {
 134         int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
 135         int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
 136         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 137         int (*get_requested_power)(struct thermal_cooling_device *,
 138                                    struct thermal_zone_device *, u32 *);
 139         int (*state2power)(struct thermal_cooling_device *,
 140                            struct thermal_zone_device *, unsigned long, u32 *);
 141         int (*power2state)(struct thermal_cooling_device *,
 142                            struct thermal_zone_device *, u32, unsigned long *);
 143 };
 144
 145 struct thermal_cooling_device {
 146         int id;
 147         char type[THERMAL_NAME_LENGTH];
 148         struct device device;
 149         struct device_node *np;
 150         void *devdata;
 151         const struct thermal_cooling_device_ops *ops;
 152         bool updated; /* true if the cooling device does not need update */
 153         struct mutex lock; /* protect thermal_instances list */
 154         struct list_head thermal_instances;
 155         struct list_head node;
 156 };
 157
 158 struct thermal_attr {
 159         struct device_attribute attr;
 160         char name[THERMAL_NAME_LENGTH];
 161 };
 162
 163 /**
 164  * struct thermal_zone_device - structure for a thermal zone
 165  * @id:         unique id number for each thermal zone
 166  * @type:       the thermal zone device type
 167  * @device:     &struct device for this thermal zone
 168  * @trip_temp_attrs:    attributes for trip points for sysfs: trip temperature
 169  * @trip_type_attrs:    attributes for trip points for sysfs: trip type
 170  * @trip_hyst_attrs:    attributes for trip points for sysfs: trip hysteresis
 171  * @devdata:    private pointer for device private data
 172  * @trips:      number of trip points the thermal zone supports
 173  * @trips_disabled;     bitmap for disabled trips
 174  * @passive_delay:      number of milliseconds to wait between polls when
 175  *                      performing passive cooling.
 176  * @polling_delay:      number of milliseconds to wait between polls when
 177  *                      checking whether trip points have been crossed (0 for
 178  *                      interrupt driven systems)
 179  * @temperature:        current temperature.  This is only for core code,
 180  *                      drivers should use thermal_zone_get_temp() to get the
 181  *                      current temperature
 182  * @last_temperature:   previous temperature read
 183  * @emul_temperature:   emulated temperature when using CONFIG_THERMAL_EMULATION
 184  * @passive:            1 if you've crossed a passive trip point, 0 otherwise.
 185  * @prev_low_trip:      the low current temperature if you've crossed a passive
 186                         trip point.
 187  * @prev_high_trip:     the above current temperature if you've crossed a
 188                         passive trip point.
 189  * @forced_passive:     If > 0, temperature at which to switch on all ACPI
 190  *                      processor cooling devices.  Currently only used by the
 191  *                      step-wise governor.
 192  * @need_update:        if equals 1, thermal_zone_device_update needs to be invoked.
 193  * @ops:        operations this &thermal_zone_device supports
 194  * @tzp:        thermal zone parameters
 195  * @governor:   pointer to the governor for this thermal zone
 196  * @governor_data:      private pointer for governor data
 197  * @thermal_instances:  list of &struct thermal_instance of this thermal zone
 198  * @ida:        &struct ida to generate unique id for this zone's cooling
 199  *              devices
 200  * @lock:       lock to protect thermal_instances list
 201  * @node:       node in thermal_tz_list (in thermal_core.c)
 202  * @poll_queue: delayed work for polling
 203  * @notify_event: Last notification event
 204  */
 205 struct thermal_zone_device {
 206         int id;
 207         char type[THERMAL_NAME_LENGTH];
 208         struct device device;
 209         struct attribute_group trips_attribute_group;
 210         struct thermal_attr *trip_temp_attrs;
 211         struct thermal_attr *trip_type_attrs;
 212         struct thermal_attr *trip_hyst_attrs;
 213         void *devdata;
 214         int trips;
 215         unsigned long trips_disabled;   /* bitmap for disabled trips */
 216         int passive_delay;
 217         int polling_delay;
 218         int temperature;
 219         int last_temperature;
 220         int emul_temperature;
 221         int passive;
 222         int prev_low_trip;
 223         int prev_high_trip;
 224         unsigned int forced_passive;
 225         atomic_t need_update;
 226         struct thermal_zone_device_ops *ops;
 227         struct thermal_zone_params *tzp;
 228         struct thermal_governor *governor;
 229         void *governor_data;
 230         struct list_head thermal_instances;
 231         struct ida ida;
 232         struct mutex lock;
 233         struct list_head node;
 234         struct delayed_work poll_queue;
 235         enum thermal_notify_event notify_event;
 236 };
 237
 238 /**
 239  * struct thermal_governor - structure that holds thermal governor information
 240  * @name:       name of the governor
 241  * @bind_to_tz: callback called when binding to a thermal zone.  If it
 242  *              returns 0, the governor is bound to the thermal zone,
 243  *              otherwise it fails.
 244  * @unbind_from_tz:     callback called when a governor is unbound from a
 245  *                      thermal zone.
 246  * @throttle:   callback called for every trip point even if temperature is
 247  *              below the trip point temperature
 248  * @governor_list:      node in thermal_governor_list (in thermal_core.c)
 249  */
 250 struct thermal_governor {
 251         char name[THERMAL_NAME_LENGTH];
 252         int (*bind_to_tz)(struct thermal_zone_device *tz);
 253         void (*unbind_from_tz)(struct thermal_zone_device *tz);
 254         int (*throttle)(struct thermal_zone_device *tz, int trip);
 255         struct list_head        governor_list;
 256 };
 257
 258 /* Structure that holds binding parameters for a zone */
 259 struct thermal_bind_params {
 260         struct thermal_cooling_device *cdev;
 261
 262         /*
 263          * This is a measure of 'how effectively these devices can
 264          * cool 'this' thermal zone. It shall be determined by
 265          * platform characterization. This value is relative to the
 266          * rest of the weights so a cooling device whose weight is
 267          * double that of another cooling device is twice as
 268          * effective. See Documentation/thermal/sysfs-api.txt for more
 269          * information.
 270          */
 271         int weight;
 272
 273         /*
 274          * This is a bit mask that gives the binding relation between this
 275          * thermal zone and cdev, for a particular trip point.
 276          * See Documentation/thermal/sysfs-api.txt for more information.
 277          */
 278         int trip_mask;
 279
 280         /*
 281          * This is an array of cooling state limits. Must have exactly
 282          * 2 * thermal_zone.number_of_trip_points. It is an array consisting
 283          * of tuples <lower-state upper-state> of state limits. Each trip
 284          * will be associated with one state limit tuple when binding.
 285          * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
 286          * on all trips.
 287          */
 288         unsigned long *binding_limits;
 289         int (*match) (struct thermal_zone_device *tz,
 290                         struct thermal_cooling_device *cdev);
 291 };
 292
 293 /* Structure to define Thermal Zone parameters */
 294 struct thermal_zone_params {
 295         char governor_name[THERMAL_NAME_LENGTH];
 296
 297         /*
 298          * a boolean to indicate if the thermal to hwmon sysfs interface
 299          * is required. when no_hwmon == false, a hwmon sysfs interface
 300          * will be created. when no_hwmon == true, nothing will be done
 301          */
 302         bool no_hwmon;
 303
 304         int num_tbps;   /* Number of tbp entries */
 305         struct thermal_bind_params *tbp;
 306
 307         /*
 308          * Sustainable power (heat) that this thermal zone can dissipate in
 309          * mW
 310          */
 311         u32 sustainable_power;
 312
 313         /*
 314          * Proportional parameter of the PID controller when
 315          * overshooting (i.e., when temperature is below the target)
 316          */
 317         s32 k_po;
 318
 319         /*
 320          * Proportional parameter of the PID controller when
 321          * undershooting
 322          */
 323         s32 k_pu;
 324
 325         /* Integral parameter of the PID controller */
 326         s32 k_i;
 327
 328         /* Derivative parameter of the PID controller */
 329         s32 k_d;
 330
 331         /* threshold below which the error is no longer accumulated */
 332         s32 integral_cutoff;
 333
 334         /*
 335          * @slope:      slope of a linear temperature adjustment curve.
 336          *              Used by thermal zone drivers.
 337          */
 338         int slope;
 339         /*
 340          * @offset:     offset of a linear temperature adjustment curve.
 341          *              Used by thermal zone drivers (default 0).
 342          */
 343         int offset;
 344 };
 345
 346 struct thermal_genl_event {
 347         u32 orig;
 348         enum events event;
 349 };
 350
 351 /**
 352  * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
 353  *
 354  * Mandatory:
 355  * @get_temp: a pointer to a function that reads the sensor temperature.
 356  *
 357  * Optional:
 358  * @get_trend: a pointer to a function that reads the sensor temperature trend.
 359  * @set_trips: a pointer to a function that sets a temperature window. When
 360  *             this window is left the driver must inform the thermal core via
 361  *             thermal_zone_device_update.
 362  * @set_emul_temp: a pointer to a function that sets sensor emulated
 363  *                 temperature.
 364  * @set_trip_temp: a pointer to a function that sets the trip temperature on
 365  *                 hardware.
 366  */
 367 struct thermal_zone_of_device_ops {
 368         int (*get_temp)(void *, int *);
 369         int (*get_trend)(void *, int, enum thermal_trend *);
 370         int (*set_trips)(void *, int, int);
 371         int (*set_emul_temp)(void *, int);
 372         int (*set_trip_temp)(void *, int, int);
 373 };
 374
 375 /**
 376  * struct thermal_trip - representation of a point in temperature domain
 377  * @np: pointer to struct device_node that this trip point was created from
 378  * @temperature: temperature value in miliCelsius
 379  * @hysteresis: relative hysteresis in miliCelsius
 380  * @type: trip point type
 381  */
 382
 383 struct thermal_trip {
 384         struct device_node *np;
 385         int temperature;
 386         int hysteresis;
 387         enum thermal_trip_type type;
 388 };
 389
 390 /* Function declarations */
 391 #ifdef CONFIG_THERMAL_OF
 392 struct thermal_zone_device *
 393 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 394                                 const struct thermal_zone_of_device_ops *ops);
 395 void thermal_zone_of_sensor_unregister(struct device *dev,
 396                                        struct thermal_zone_device *tz);
 397 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
 398                 struct device *dev, int id, void *data,
 399                 const struct thermal_zone_of_device_ops *ops);
 400 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
 401                                             struct thermal_zone_device *tz);
 402 #else
 403 static inline struct thermal_zone_device *
 404 thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
 405                                 const struct thermal_zone_of_device_ops *ops)
 406 {
 407         return ERR_PTR(-ENODEV);
 408 }
 409
 410 static inline
 411 void thermal_zone_of_sensor_unregister(struct device *dev,
 412                                        struct thermal_zone_device *tz)
 413 {
 414 }
 415
 416 static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
 417                 struct device *dev, int id, void *data,
 418                 const struct thermal_zone_of_device_ops *ops)
 419 {
 420         return ERR_PTR(-ENODEV);
 421 }
 422
 423 static inline
 424 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
 425                                             struct thermal_zone_device *tz)
 426 {
 427 }
 428
 429 #endif
 430
 431 #if IS_ENABLED(CONFIG_THERMAL)
 432 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 433 {
 434         return cdev->ops->get_requested_power && cdev->ops->state2power &&
 435                 cdev->ops->power2state;
 436 }
 437
 438 int power_actor_get_max_power(struct thermal_cooling_device *,
 439                               struct thermal_zone_device *tz, u32 *max_power);
 440 int power_actor_get_min_power(struct thermal_cooling_device *,
 441                               struct thermal_zone_device *tz, u32 *min_power);
 442 int power_actor_set_power(struct thermal_cooling_device *,
 443                           struct thermal_instance *, u32);
 444 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 445                 void *, struct thermal_zone_device_ops *,
 446                 struct thermal_zone_params *, int, int);
 447 void thermal_zone_device_unregister(struct thermal_zone_device *);
 448
 449 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 450                                      struct thermal_cooling_device *,
 451                                      unsigned long, unsigned long,
 452                                      unsigned int);
 453 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 454                                        struct thermal_cooling_device *);
 455 void thermal_zone_device_update(struct thermal_zone_device *,
 456                                 enum thermal_notify_event);
 457 void thermal_zone_set_trips(struct thermal_zone_device *);
 458
 459 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
 460                 const struct thermal_cooling_device_ops *);
 461 struct thermal_cooling_device *
 462 thermal_of_cooling_device_register(struct device_node *np, char *, void *,
 463                                    const struct thermal_cooling_device_ops *);
 464 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 465 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
 466 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
 467 int thermal_zone_get_slope(struct thermal_zone_device *tz);
 468 int thermal_zone_get_offset(struct thermal_zone_device *tz);
 469
 470 int get_tz_trend(struct thermal_zone_device *, int);
 471 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 472                 struct thermal_cooling_device *, int);
 473 void thermal_cdev_update(struct thermal_cooling_device *);
 474 void thermal_notify_framework(struct thermal_zone_device *, int);
 475 #else
 476 static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
 477 { return false; }
 478 static inline int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 479                               struct thermal_zone_device *tz, u32 *max_power)
 480 { return 0; }
 481 static inline int power_actor_get_min_power(struct thermal_cooling_device *cdev,
 482                                             struct thermal_zone_device *tz,
 483                                             u32 *min_power)
 484 { return -ENODEV; }
 485 static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
 486                           struct thermal_instance *tz, u32 power)
 487 { return 0; }
 488 static inline struct thermal_zone_device *thermal_zone_device_register(
 489         const char *type, int trips, int mask, void *devdata,
 490         struct thermal_zone_device_ops *ops,
 491         struct thermal_zone_params *tzp,
 492         int passive_delay, int polling_delay)
 493 { return ERR_PTR(-ENODEV); }
 494 static inline void thermal_zone_device_unregister(
 495         struct thermal_zone_device *tz)
 496 { }
 497 static inline int thermal_zone_bind_cooling_device(
 498         struct thermal_zone_device *tz, int trip,
 499         struct thermal_cooling_device *cdev,
 500         unsigned long upper, unsigned long lower,
 501         unsigned int weight)
 502 { return -ENODEV; }
 503 static inline int thermal_zone_unbind_cooling_device(
 504         struct thermal_zone_device *tz, int trip,
 505         struct thermal_cooling_device *cdev)
 506 { return -ENODEV; }
 507 static inline void thermal_zone_device_update(struct thermal_zone_device *tz,
 508                                               enum thermal_notify_event event)
 509 { }
 510 static inline void thermal_zone_set_trips(struct thermal_zone_device *tz)
 511 { }
 512 static inline struct thermal_cooling_device *
 513 thermal_cooling_device_register(char *type, void *devdata,
 514         const struct thermal_cooling_device_ops *ops)
 515 { return ERR_PTR(-ENODEV); }
 516 static inline struct thermal_cooling_device *
 517 thermal_of_cooling_device_register(struct device_node *np,
 518         char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 519 { return ERR_PTR(-ENODEV); }
 520 static inline void thermal_cooling_device_unregister(
 521         struct thermal_cooling_device *cdev)
 522 { }
 523 static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
 524                 const char *name)
 525 { return ERR_PTR(-ENODEV); }
 526 static inline int thermal_zone_get_temp(
 527                 struct thermal_zone_device *tz, int *temp)
 528 { return -ENODEV; }
 529 static inline int thermal_zone_get_slope(
 530                 struct thermal_zone_device *tz)
 531 { return -ENODEV; }
 532 static inline int thermal_zone_get_offset(
 533                 struct thermal_zone_device *tz)
 534 { return -ENODEV; }
 535 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
 536 { return -ENODEV; }
 537 static inline struct thermal_instance *
 538 get_thermal_instance(struct thermal_zone_device *tz,
 539         struct thermal_cooling_device *cdev, int trip)
 540 { return ERR_PTR(-ENODEV); }
 541 static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
 542 { }
 543 static inline void thermal_notify_framework(struct thermal_zone_device *tz,
 544         int trip)
 545 { }
 546 #endif /* CONFIG_THERMAL */
 547
 548 #if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
 549 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 550                                                 enum events event);
 551 #else
 552 static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 553                                                 enum events event)
 554 {
 555         return 0;
 556 }
 557 #endif
 558
 559 #endif /* __THERMAL_H__ */