drivers/thermal/thermal_core.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   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  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/device.h>
  17 #include <linux/err.h>
  18 #include <linux/slab.h>
  19 #include <linux/kdev_t.h>
  20 #include <linux/idr.h>
  21 #include <linux/thermal.h>
  22 #include <linux/reboot.h>
  23 #include <linux/string.h>
  24 #include <linux/of.h>
  25 #include <net/netlink.h>
  26 #include <net/genetlink.h>
  27 #include <linux/suspend.h>
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/thermal.h>
  31
  32 #include "thermal_core.h"
  33 #include "thermal_hwmon.h"
  34
  35 MODULE_AUTHOR("Zhang Rui");
  36 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  37 MODULE_LICENSE("GPL v2");
  38
  39 static DEFINE_IDA(thermal_tz_ida);
  40 static DEFINE_IDA(thermal_cdev_ida);
  41
  42 static LIST_HEAD(thermal_tz_list);
  43 static LIST_HEAD(thermal_cdev_list);
  44 static LIST_HEAD(thermal_governor_list);
  45
  46 static DEFINE_MUTEX(thermal_list_lock);
  47 static DEFINE_MUTEX(thermal_governor_lock);
  48 static DEFINE_MUTEX(poweroff_lock);
  49
  50 static atomic_t in_suspend;
  51 static bool power_off_triggered;
  52
  53 static struct thermal_governor *def_governor;
  54
  55 /*
  56  * Governor section: set of functions to handle thermal governors
  57  *
  58  * Functions to help in the life cycle of thermal governors within
  59  * the thermal core and by the thermal governor code.
  60  */
  61
  62 static struct thermal_governor *__find_governor(const char *name)
  63 {
  64         struct thermal_governor *pos;
  65
  66         if (!name || !name[0])
  67                 return def_governor;
  68
  69         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  70                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  71                         return pos;
  72
  73         return NULL;
  74 }
  75
  76 /**
  77  * bind_previous_governor() - bind the previous governor of the thermal zone
  78  * @tz:         a valid pointer to a struct thermal_zone_device
  79  * @failed_gov_name:    the name of the governor that failed to register
  80  *
  81  * Register the previous governor of the thermal zone after a new
  82  * governor has failed to be bound.
  83  */
  84 static void bind_previous_governor(struct thermal_zone_device *tz,
  85                                    const char *failed_gov_name)
  86 {
  87         if (tz->governor && tz->governor->bind_to_tz) {
  88                 if (tz->governor->bind_to_tz(tz)) {
  89                         dev_err(&tz->device,
  90                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  91                                 failed_gov_name, tz->governor->name, tz->type);
  92                         tz->governor = NULL;
  93                 }
  94         }
  95 }
  96
  97 /**
  98  * thermal_set_governor() - Switch to another governor
  99  * @tz:         a valid pointer to a struct thermal_zone_device
 100  * @new_gov:    pointer to the new governor
 101  *
 102  * Change the governor of thermal zone @tz.
 103  *
 104  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
 105  */
 106 static int thermal_set_governor(struct thermal_zone_device *tz,
 107                                 struct thermal_governor *new_gov)
 108 {
 109         int ret = 0;
 110
 111         if (tz->governor && tz->governor->unbind_from_tz)
 112                 tz->governor->unbind_from_tz(tz);
 113
 114         if (new_gov && new_gov->bind_to_tz) {
 115                 ret = new_gov->bind_to_tz(tz);
 116                 if (ret) {
 117                         bind_previous_governor(tz, new_gov->name);
 118
 119                         return ret;
 120                 }
 121         }
 122
 123         tz->governor = new_gov;
 124
 125         return ret;
 126 }
 127
 128 int thermal_register_governor(struct thermal_governor *governor)
 129 {
 130         int err;
 131         const char *name;
 132         struct thermal_zone_device *pos;
 133
 134         if (!governor)
 135                 return -EINVAL;
 136
 137         mutex_lock(&thermal_governor_lock);
 138
 139         err = -EBUSY;
 140         if (!__find_governor(governor->name)) {
 141                 bool match_default;
 142
 143                 err = 0;
 144                 list_add(&governor->governor_list, &thermal_governor_list);
 145                 match_default = !strncmp(governor->name,
 146                                          DEFAULT_THERMAL_GOVERNOR,
 147                                          THERMAL_NAME_LENGTH);
 148
 149                 if (!def_governor && match_default)
 150                         def_governor = governor;
 151         }
 152
 153         mutex_lock(&thermal_list_lock);
 154
 155         list_for_each_entry(pos, &thermal_tz_list, node) {
 156                 /*
 157                  * only thermal zones with specified tz->tzp->governor_name
 158                  * may run with tz->govenor unset
 159                  */
 160                 if (pos->governor)
 161                         continue;
 162
 163                 name = pos->tzp->governor_name;
 164
 165                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 166                         int ret;
 167
 168                         ret = thermal_set_governor(pos, governor);
 169                         if (ret)
 170                                 dev_err(&pos->device,
 171                                         "Failed to set governor %s for thermal zone %s: %d\n",
 172                                         governor->name, pos->type, ret);
 173                 }
 174         }
 175
 176         mutex_unlock(&thermal_list_lock);
 177         mutex_unlock(&thermal_governor_lock);
 178
 179         return err;
 180 }
 181
 182 void thermal_unregister_governor(struct thermal_governor *governor)
 183 {
 184         struct thermal_zone_device *pos;
 185
 186         if (!governor)
 187                 return;
 188
 189         mutex_lock(&thermal_governor_lock);
 190
 191         if (!__find_governor(governor->name))
 192                 goto exit;
 193
 194         mutex_lock(&thermal_list_lock);
 195
 196         list_for_each_entry(pos, &thermal_tz_list, node) {
 197                 if (!strncasecmp(pos->governor->name, governor->name,
 198                                  THERMAL_NAME_LENGTH))
 199                         thermal_set_governor(pos, NULL);
 200         }
 201
 202         mutex_unlock(&thermal_list_lock);
 203         list_del(&governor->governor_list);
 204 exit:
 205         mutex_unlock(&thermal_governor_lock);
 206 }
 207
 208 int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
 209                                    char *policy)
 210 {
 211         struct thermal_governor *gov;
 212         int ret = -EINVAL;
 213
 214         mutex_lock(&thermal_governor_lock);
 215         mutex_lock(&tz->lock);
 216
 217         gov = __find_governor(strim(policy));
 218         if (!gov)
 219                 goto exit;
 220
 221         ret = thermal_set_governor(tz, gov);
 222
 223 exit:
 224         mutex_unlock(&tz->lock);
 225         mutex_unlock(&thermal_governor_lock);
 226
 227         return ret;
 228 }
 229
 230 int thermal_build_list_of_policies(char *buf)
 231 {
 232         struct thermal_governor *pos;
 233         ssize_t count = 0;
 234         ssize_t size = PAGE_SIZE;
 235
 236         mutex_lock(&thermal_governor_lock);
 237
 238         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 239                 size = PAGE_SIZE - count;
 240                 count += scnprintf(buf + count, size, "%s ", pos->name);
 241         }
 242         count += scnprintf(buf + count, size, "\n");
 243
 244         mutex_unlock(&thermal_governor_lock);
 245
 246         return count;
 247 }
 248
 249 static int __init thermal_register_governors(void)
 250 {
 251         int result;
 252
 253         result = thermal_gov_step_wise_register();
 254         if (result)
 255                 return result;
 256
 257         result = thermal_gov_fair_share_register();
 258         if (result)
 259                 return result;
 260
 261         result = thermal_gov_bang_bang_register();
 262         if (result)
 263                 return result;
 264
 265         result = thermal_gov_user_space_register();
 266         if (result)
 267                 return result;
 268
 269         return thermal_gov_power_allocator_register();
 270 }
 271
 272 static void thermal_unregister_governors(void)
 273 {
 274         thermal_gov_step_wise_unregister();
 275         thermal_gov_fair_share_unregister();
 276         thermal_gov_bang_bang_unregister();
 277         thermal_gov_user_space_unregister();
 278         thermal_gov_power_allocator_unregister();
 279 }
 280
 281 /*
 282  * Zone update section: main control loop applied to each zone while monitoring
 283  *
 284  * in polling mode. The monitoring is done using a workqueue.
 285  * Same update may be done on a zone by calling thermal_zone_device_update().
 286  *
 287  * An update means:
 288  * - Non-critical trips will invoke the governor responsible for that zone;
 289  * - Hot trips will produce a notification to userspace;
 290  * - Critical trip point will cause a system shutdown.
 291  */
 292 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 293                                             int delay)
 294 {
 295         if (delay > 1000)
 296                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 297                                  round_jiffies(msecs_to_jiffies(delay)));
 298         else if (delay)
 299                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 300                                  msecs_to_jiffies(delay));
 301         else
 302                 cancel_delayed_work(&tz->poll_queue);
 303 }
 304
 305 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 306 {
 307         mutex_lock(&tz->lock);
 308
 309         if (tz->passive)
 310                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 311         else if (tz->polling_delay)
 312                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 313         else
 314                 thermal_zone_device_set_polling(tz, 0);
 315
 316         mutex_unlock(&tz->lock);
 317 }
 318
 319 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 320                                       int trip,
 321                                       enum thermal_trip_type trip_type)
 322 {
 323         tz->governor ? tz->governor->throttle(tz, trip) :
 324                        def_governor->throttle(tz, trip);
 325 }
 326
 327 /**
 328  * thermal_emergency_poweroff_func - emergency poweroff work after a known delay
 329  * @work: work_struct associated with the emergency poweroff function
 330  *
 331  * This function is called in very critical situations to force
 332  * a kernel poweroff after a configurable timeout value.
 333  */
 334 static void thermal_emergency_poweroff_func(struct work_struct *work)
 335 {
 336         /*
 337          * We have reached here after the emergency thermal shutdown
 338          * Waiting period has expired. This means orderly_poweroff has
 339          * not been able to shut off the system for some reason.
 340          * Try to shut down the system immediately using kernel_power_off
 341          * if populated
 342          */
 343         WARN(1, "Attempting kernel_power_off: Temperature too high\n");
 344         kernel_power_off();
 345
 346         /*
 347          * Worst of the worst case trigger emergency restart
 348          */
 349         WARN(1, "Attempting emergency_restart: Temperature too high\n");
 350         emergency_restart();
 351 }
 352
 353 static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work,
 354                             thermal_emergency_poweroff_func);
 355
 356 /**
 357  * thermal_emergency_poweroff - Trigger an emergency system poweroff
 358  *
 359  * This may be called from any critical situation to trigger a system shutdown
 360  * after a known period of time. By default this is not scheduled.
 361  */
 362 void thermal_emergency_poweroff(void)
 363 {
 364         int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS;
 365         /*
 366          * poweroff_delay_ms must be a carefully profiled positive value.
 367          * Its a must for thermal_emergency_poweroff_work to be scheduled
 368          */
 369         if (poweroff_delay_ms <= 0)
 370                 return;
 371         schedule_delayed_work(&thermal_emergency_poweroff_work,
 372                               msecs_to_jiffies(poweroff_delay_ms));
 373 }
 374
 375 static void handle_critical_trips(struct thermal_zone_device *tz,
 376                                   int trip, enum thermal_trip_type trip_type)
 377 {
 378         int trip_temp;
 379
 380         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 381
 382         /* If we have not crossed the trip_temp, we do not care. */
 383         if (trip_temp <= 0 || tz->temperature < trip_temp)
 384                 return;
 385
 386         trace_thermal_zone_trip(tz, trip, trip_type);
 387
 388         if (tz->ops->notify)
 389                 tz->ops->notify(tz, trip, trip_type);
 390
 391         if (trip_type == THERMAL_TRIP_CRITICAL) {
 392                 dev_emerg(&tz->device,
 393                           "critical temperature reached(%d C),shutting down\n",
 394                           tz->temperature / 1000);
 395                 mutex_lock(&poweroff_lock);
 396                 if (!power_off_triggered) {
 397                         /*
 398                          * Queue a backup emergency shutdown in the event of
 399                          * orderly_poweroff failure
 400                          */
 401                         thermal_emergency_poweroff();
 402                         orderly_poweroff(true);
 403                         power_off_triggered = true;
 404                 }
 405                 mutex_unlock(&poweroff_lock);
 406         }
 407 }
 408
 409 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 410 {
 411         enum thermal_trip_type type;
 412
 413         /* Ignore disabled trip points */
 414         if (test_bit(trip, &tz->trips_disabled))
 415                 return;
 416
 417         tz->ops->get_trip_type(tz, trip, &type);
 418
 419         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 420                 handle_critical_trips(tz, trip, type);
 421         else
 422                 handle_non_critical_trips(tz, trip, type);
 423         /*
 424          * Alright, we handled this trip successfully.
 425          * So, start monitoring again.
 426          */
 427         monitor_thermal_zone(tz);
 428 }
 429
 430 static void update_temperature(struct thermal_zone_device *tz)
 431 {
 432         int temp, ret;
 433
 434         ret = thermal_zone_get_temp(tz, &temp);
 435         if (ret) {
 436                 if (ret != -EAGAIN)
 437                         dev_warn(&tz->device,
 438                                  "failed to read out thermal zone (%d)\n",
 439                                  ret);
 440                 return;
 441         }
 442
 443         mutex_lock(&tz->lock);
 444         tz->last_temperature = tz->temperature;
 445         tz->temperature = temp;
 446         mutex_unlock(&tz->lock);
 447
 448         trace_thermal_temperature(tz);
 449         if (tz->last_temperature == THERMAL_TEMP_INVALID)
 450                 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
 451                         tz->temperature);
 452         else
 453                 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 454                         tz->last_temperature, tz->temperature);
 455 }
 456
 457 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 458 {
 459         struct thermal_instance *pos;
 460
 461         tz->temperature = THERMAL_TEMP_INVALID;
 462         tz->passive = 0;
 463         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 464                 pos->initialized = false;
 465 }
 466
 467 void thermal_zone_device_update(struct thermal_zone_device *tz,
 468                                 enum thermal_notify_event event)
 469 {
 470         int count;
 471
 472         if (atomic_read(&in_suspend))
 473                 return;
 474
 475         if (!tz->ops->get_temp)
 476                 return;
 477
 478         update_temperature(tz);
 479
 480         thermal_zone_set_trips(tz);
 481
 482         tz->notify_event = event;
 483
 484         for (count = 0; count < tz->trips; count++)
 485                 handle_thermal_trip(tz, count);
 486 }
 487 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 488
 489 /**
 490  * thermal_notify_framework - Sensor drivers use this API to notify framework
 491  * @tz:         thermal zone device
 492  * @trip:       indicates which trip point has been crossed
 493  *
 494  * This function handles the trip events from sensor drivers. It starts
 495  * throttling the cooling devices according to the policy configured.
 496  * For CRITICAL and HOT trip points, this notifies the respective drivers,
 497  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
 498  * The throttling policy is based on the configured platform data; if no
 499  * platform data is provided, this uses the step_wise throttling policy.
 500  */
 501 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
 502 {
 503         handle_thermal_trip(tz, trip);
 504 }
 505 EXPORT_SYMBOL_GPL(thermal_notify_framework);
 506
 507 static void thermal_zone_device_check(struct work_struct *work)
 508 {
 509         struct thermal_zone_device *tz = container_of(work, struct
 510                                                       thermal_zone_device,
 511                                                       poll_queue.work);
 512         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 513 }
 514
 515 /*
 516  * Power actor section: interface to power actors to estimate power
 517  *
 518  * Set of functions used to interact to cooling devices that know
 519  * how to estimate their devices power consumption.
 520  */
 521
 522 /**
 523  * power_actor_get_max_power() - get the maximum power that a cdev can consume
 524  * @cdev:       pointer to &thermal_cooling_device
 525  * @tz:         a valid thermal zone device pointer
 526  * @max_power:  pointer in which to store the maximum power
 527  *
 528  * Calculate the maximum power consumption in milliwats that the
 529  * cooling device can currently consume and store it in @max_power.
 530  *
 531  * Return: 0 on success, -EINVAL if @cdev doesn't support the
 532  * power_actor API or -E* on other error.
 533  */
 534 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 535                               struct thermal_zone_device *tz, u32 *max_power)
 536 {
 537         if (!cdev_is_power_actor(cdev))
 538                 return -EINVAL;
 539
 540         return cdev->ops->state2power(cdev, tz, 0, max_power);
 541 }
 542
 543 /**
 544  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
 545  * @cdev:       pointer to &thermal_cooling_device
 546  * @tz:         a valid thermal zone device pointer
 547  * @min_power:  pointer in which to store the minimum power
 548  *
 549  * Calculate the minimum power consumption in milliwatts that the
 550  * cooling device can currently consume and store it in @min_power.
 551  *
 552  * Return: 0 on success, -EINVAL if @cdev doesn't support the
 553  * power_actor API or -E* on other error.
 554  */
 555 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
 556                               struct thermal_zone_device *tz, u32 *min_power)
 557 {
 558         unsigned long max_state;
 559         int ret;
 560
 561         if (!cdev_is_power_actor(cdev))
 562                 return -EINVAL;
 563
 564         ret = cdev->ops->get_max_state(cdev, &max_state);
 565         if (ret)
 566                 return ret;
 567
 568         return cdev->ops->state2power(cdev, tz, max_state, min_power);
 569 }
 570
 571 /**
 572  * power_actor_set_power() - limit the maximum power a cooling device consumes
 573  * @cdev:       pointer to &thermal_cooling_device
 574  * @instance:   thermal instance to update
 575  * @power:      the power in milliwatts
 576  *
 577  * Set the cooling device to consume at most @power milliwatts. The limit is
 578  * expected to be a cap at the maximum power consumption.
 579  *
 580  * Return: 0 on success, -EINVAL if the cooling device does not
 581  * implement the power actor API or -E* for other failures.
 582  */
 583 int power_actor_set_power(struct thermal_cooling_device *cdev,
 584                           struct thermal_instance *instance, u32 power)
 585 {
 586         unsigned long state;
 587         int ret;
 588
 589         if (!cdev_is_power_actor(cdev))
 590                 return -EINVAL;
 591
 592         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
 593         if (ret)
 594                 return ret;
 595
 596         instance->target = state;
 597         mutex_lock(&cdev->lock);
 598         cdev->updated = false;
 599         mutex_unlock(&cdev->lock);
 600         thermal_cdev_update(cdev);
 601
 602         return 0;
 603 }
 604
 605 void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz,
 606                                           const char *cdev_type, size_t size)
 607 {
 608         struct thermal_cooling_device *cdev = NULL;
 609
 610         mutex_lock(&thermal_list_lock);
 611         list_for_each_entry(cdev, &thermal_cdev_list, node) {
 612                 /* skip non matching cdevs */
 613                 if (strncmp(cdev_type, cdev->type, size))
 614                         continue;
 615
 616                 /* re binding the exception matching the type pattern */
 617                 thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev,
 618                                                  THERMAL_NO_LIMIT,
 619                                                  THERMAL_NO_LIMIT,
 620                                                  THERMAL_WEIGHT_DEFAULT);
 621         }
 622         mutex_unlock(&thermal_list_lock);
 623 }
 624
 625 void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,
 626                                           const char *cdev_type, size_t size)
 627 {
 628         struct thermal_cooling_device *cdev = NULL;
 629
 630         mutex_lock(&thermal_list_lock);
 631         list_for_each_entry(cdev, &thermal_cdev_list, node) {
 632                 /* skip non matching cdevs */
 633                 if (strncmp(cdev_type, cdev->type, size))
 634                         continue;
 635                 /* unbinding the exception matching the type pattern */
 636                 thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE,
 637                                                    cdev);
 638         }
 639         mutex_unlock(&thermal_list_lock);
 640 }
 641
 642 /*
 643  * Device management section: cooling devices, zones devices, and binding
 644  *
 645  * Set of functions provided by the thermal core for:
 646  * - cooling devices lifecycle: registration, unregistration,
 647  *                              binding, and unbinding.
 648  * - thermal zone devices lifecycle: registration, unregistration,
 649  *                                   binding, and unbinding.
 650  */
 651
 652 /**
 653  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
 654  * @tz:         pointer to struct thermal_zone_device
 655  * @trip:       indicates which trip point the cooling devices is
 656  *              associated with in this thermal zone.
 657  * @cdev:       pointer to struct thermal_cooling_device
 658  * @upper:      the Maximum cooling state for this trip point.
 659  *              THERMAL_NO_LIMIT means no upper limit,
 660  *              and the cooling device can be in max_state.
 661  * @lower:      the Minimum cooling state can be used for this trip point.
 662  *              THERMAL_NO_LIMIT means no lower limit,
 663  *              and the cooling device can be in cooling state 0.
 664  * @weight:     The weight of the cooling device to be bound to the
 665  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
 666  *              default value
 667  *
 668  * This interface function bind a thermal cooling device to the certain trip
 669  * point of a thermal zone device.
 670  * This function is usually called in the thermal zone device .bind callback.
 671  *
 672  * Return: 0 on success, the proper error value otherwise.
 673  */
 674 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 675                                      int trip,
 676                                      struct thermal_cooling_device *cdev,
 677                                      unsigned long upper, unsigned long lower,
 678                                      unsigned int weight)
 679 {
 680         struct thermal_instance *dev;
 681         struct thermal_instance *pos;
 682         struct thermal_zone_device *pos1;
 683         struct thermal_cooling_device *pos2;
 684         unsigned long max_state;
 685         int result, ret;
 686
 687         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 688                 return -EINVAL;
 689
 690         list_for_each_entry(pos1, &thermal_tz_list, node) {
 691                 if (pos1 == tz)
 692                         break;
 693         }
 694         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 695                 if (pos2 == cdev)
 696                         break;
 697         }
 698
 699         if (tz != pos1 || cdev != pos2)
 700                 return -EINVAL;
 701
 702         ret = cdev->ops->get_max_state(cdev, &max_state);
 703         if (ret)
 704                 return ret;
 705
 706         /* lower default 0, upper default max_state */
 707         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 708         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 709
 710         if (lower > upper || upper > max_state)
 711                 return -EINVAL;
 712
 713         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 714         if (!dev)
 715                 return -ENOMEM;
 716         dev->tz = tz;
 717         dev->cdev = cdev;
 718         dev->trip = trip;
 719         dev->upper = upper;
 720         dev->lower = lower;
 721         dev->target = THERMAL_NO_TARGET;
 722         dev->weight = weight;
 723
 724         result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL);
 725         if (result < 0)
 726                 goto free_mem;
 727
 728         dev->id = result;
 729         sprintf(dev->name, "cdev%d", dev->id);
 730         result =
 731             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 732         if (result)
 733                 goto release_ida;
 734
 735         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 736         sysfs_attr_init(&dev->attr.attr);
 737         dev->attr.attr.name = dev->attr_name;
 738         dev->attr.attr.mode = 0444;
 739         dev->attr.show = thermal_cooling_device_trip_point_show;
 740         result = device_create_file(&tz->device, &dev->attr);
 741         if (result)
 742                 goto remove_symbol_link;
 743
 744         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
 745         sysfs_attr_init(&dev->weight_attr.attr);
 746         dev->weight_attr.attr.name = dev->weight_attr_name;
 747         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
 748         dev->weight_attr.show = thermal_cooling_device_weight_show;
 749         dev->weight_attr.store = thermal_cooling_device_weight_store;
 750         result = device_create_file(&tz->device, &dev->weight_attr);
 751         if (result)
 752                 goto remove_trip_file;
 753
 754         mutex_lock(&tz->lock);
 755         mutex_lock(&cdev->lock);
 756         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 757                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 758                         result = -EEXIST;
 759                         break;
 760                 }
 761         if (!result) {
 762                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 763                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 764                 atomic_set(&tz->need_update, 1);
 765         }
 766         mutex_unlock(&cdev->lock);
 767         mutex_unlock(&tz->lock);
 768
 769         if (!result)
 770                 return 0;
 771
 772         device_remove_file(&tz->device, &dev->weight_attr);
 773 remove_trip_file:
 774         device_remove_file(&tz->device, &dev->attr);
 775 remove_symbol_link:
 776         sysfs_remove_link(&tz->device.kobj, dev->name);
 777 release_ida:
 778         ida_simple_remove(&tz->ida, dev->id);
 779 free_mem:
 780         kfree(dev);
 781         return result;
 782 }
 783 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
 784
 785 /**
 786  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
 787  *                                        thermal zone.
 788  * @tz:         pointer to a struct thermal_zone_device.
 789  * @trip:       indicates which trip point the cooling devices is
 790  *              associated with in this thermal zone.
 791  * @cdev:       pointer to a struct thermal_cooling_device.
 792  *
 793  * This interface function unbind a thermal cooling device from the certain
 794  * trip point of a thermal zone device.
 795  * This function is usually called in the thermal zone device .unbind callback.
 796  *
 797  * Return: 0 on success, the proper error value otherwise.
 798  */
 799 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 800                                        int trip,
 801                                        struct thermal_cooling_device *cdev)
 802 {
 803         struct thermal_instance *pos, *next;
 804
 805         mutex_lock(&tz->lock);
 806         mutex_lock(&cdev->lock);
 807         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 808                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 809                         list_del(&pos->tz_node);
 810                         list_del(&pos->cdev_node);
 811                         mutex_unlock(&cdev->lock);
 812                         mutex_unlock(&tz->lock);
 813                         goto unbind;
 814                 }
 815         }
 816         mutex_unlock(&cdev->lock);
 817         mutex_unlock(&tz->lock);
 818
 819         return -ENODEV;
 820
 821 unbind:
 822         device_remove_file(&tz->device, &pos->weight_attr);
 823         device_remove_file(&tz->device, &pos->attr);
 824         sysfs_remove_link(&tz->device.kobj, pos->name);
 825         ida_simple_remove(&tz->ida, pos->id);
 826         kfree(pos);
 827         return 0;
 828 }
 829 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
 830
 831 static void thermal_release(struct device *dev)
 832 {
 833         struct thermal_zone_device *tz;
 834         struct thermal_cooling_device *cdev;
 835
 836         if (!strncmp(dev_name(dev), "thermal_zone",
 837                      sizeof("thermal_zone") - 1)) {
 838                 tz = to_thermal_zone(dev);
 839                 kfree(tz->trip_type_attrs);
 840                 kfree(tz->trip_temp_attrs);
 841                 kfree(tz->trip_hyst_attrs);
 842                 kfree(tz->trips_attribute_group.attrs);
 843                 kfree(tz->device.groups);
 844                 kfree(tz);
 845         } else if (!strncmp(dev_name(dev), "cooling_device",
 846                             sizeof("cooling_device") - 1)) {
 847                 cdev = to_cooling_device(dev);
 848                 kfree(cdev);
 849         }
 850 }
 851
 852 static struct class thermal_class = {
 853         .name = "thermal",
 854         .dev_release = thermal_release,
 855 };
 856
 857 static inline
 858 void print_bind_err_msg(struct thermal_zone_device *tz,
 859                         struct thermal_cooling_device *cdev, int ret)
 860 {
 861         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 862                 tz->type, cdev->type, ret);
 863 }
 864
 865 static void __bind(struct thermal_zone_device *tz, int mask,
 866                    struct thermal_cooling_device *cdev,
 867                    unsigned long *limits,
 868                    unsigned int weight)
 869 {
 870         int i, ret;
 871
 872         for (i = 0; i < tz->trips; i++) {
 873                 if (mask & (1 << i)) {
 874                         unsigned long upper, lower;
 875
 876                         upper = THERMAL_NO_LIMIT;
 877                         lower = THERMAL_NO_LIMIT;
 878                         if (limits) {
 879                                 lower = limits[i * 2];
 880                                 upper = limits[i * 2 + 1];
 881                         }
 882                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 883                                                                upper, lower,
 884                                                                weight);
 885                         if (ret)
 886                                 print_bind_err_msg(tz, cdev, ret);
 887                 }
 888         }
 889 }
 890
 891 static void bind_cdev(struct thermal_cooling_device *cdev)
 892 {
 893         int i, ret;
 894         const struct thermal_zone_params *tzp;
 895         struct thermal_zone_device *pos = NULL;
 896
 897         mutex_lock(&thermal_list_lock);
 898
 899         list_for_each_entry(pos, &thermal_tz_list, node) {
 900                 if (!pos->tzp && !pos->ops->bind)
 901                         continue;
 902
 903                 if (pos->ops->bind) {
 904                         ret = pos->ops->bind(pos, cdev);
 905                         if (ret)
 906                                 print_bind_err_msg(pos, cdev, ret);
 907                         continue;
 908                 }
 909
 910                 tzp = pos->tzp;
 911                 if (!tzp || !tzp->tbp)
 912                         continue;
 913
 914                 for (i = 0; i < tzp->num_tbps; i++) {
 915                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 916                                 continue;
 917                         if (tzp->tbp[i].match(pos, cdev))
 918                                 continue;
 919                         tzp->tbp[i].cdev = cdev;
 920                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 921                                tzp->tbp[i].binding_limits,
 922                                tzp->tbp[i].weight);
 923                 }
 924         }
 925
 926         mutex_unlock(&thermal_list_lock);
 927 }
 928
 929 /**
 930  * __thermal_cooling_device_register() - register a new thermal cooling device
 931  * @np:         a pointer to a device tree node.
 932  * @type:       the thermal cooling device type.
 933  * @devdata:    device private data.
 934  * @ops:                standard thermal cooling devices callbacks.
 935  *
 936  * This interface function adds a new thermal cooling device (fan/processor/...)
 937  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
 938  * to all the thermal zone devices registered at the same time.
 939  * It also gives the opportunity to link the cooling device to a device tree
 940  * node, so that it can be bound to a thermal zone created out of device tree.
 941  *
 942  * Return: a pointer to the created struct thermal_cooling_device or an
 943  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
 944  */
 945 static struct thermal_cooling_device *
 946 __thermal_cooling_device_register(struct device_node *np,
 947                                   char *type, void *devdata,
 948                                   const struct thermal_cooling_device_ops *ops)
 949 {
 950         struct thermal_cooling_device *cdev;
 951         struct thermal_zone_device *pos = NULL;
 952         int result;
 953
 954         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
 955                 return ERR_PTR(-EINVAL);
 956
 957         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 958             !ops->set_cur_state)
 959                 return ERR_PTR(-EINVAL);
 960
 961         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 962         if (!cdev)
 963                 return ERR_PTR(-ENOMEM);
 964
 965         result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL);
 966         if (result < 0) {
 967                 kfree(cdev);
 968                 return ERR_PTR(result);
 969         }
 970
 971         cdev->id = result;
 972         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
 973         mutex_init(&cdev->lock);
 974         INIT_LIST_HEAD(&cdev->thermal_instances);
 975         cdev->np = np;
 976         cdev->ops = ops;
 977         cdev->updated = false;
 978         cdev->device.class = &thermal_class;
 979         thermal_cooling_device_setup_sysfs(cdev);
 980         cdev->devdata = devdata;
 981         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 982         result = device_register(&cdev->device);
 983         if (result) {
 984                 ida_simple_remove(&thermal_cdev_ida, cdev->id);
 985                 kfree(cdev);
 986                 return ERR_PTR(result);
 987         }
 988
 989         /* Add 'this' new cdev to the global cdev list */
 990         mutex_lock(&thermal_list_lock);
 991         list_add(&cdev->node, &thermal_cdev_list);
 992         mutex_unlock(&thermal_list_lock);
 993
 994         /* Update binding information for 'this' new cdev */
 995         bind_cdev(cdev);
 996
 997         mutex_lock(&thermal_list_lock);
 998         list_for_each_entry(pos, &thermal_tz_list, node)
 999                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1000                         thermal_zone_device_update(pos,
1001                                                    THERMAL_EVENT_UNSPECIFIED);
1002         mutex_unlock(&thermal_list_lock);
1003
1004         return cdev;
1005 }
1006
1007 /**
1008  * thermal_cooling_device_register() - register a new thermal cooling device
1009  * @type:       the thermal cooling device type.
1010  * @devdata:    device private data.
1011  * @ops:                standard thermal cooling devices callbacks.
1012  *
1013  * This interface function adds a new thermal cooling device (fan/processor/...)
1014  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1015  * to all the thermal zone devices registered at the same time.
1016  *
1017  * Return: a pointer to the created struct thermal_cooling_device or an
1018  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1019  */
1020 struct thermal_cooling_device *
1021 thermal_cooling_device_register(char *type, void *devdata,
1022                                 const struct thermal_cooling_device_ops *ops)
1023 {
1024         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1025 }
1026 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1027
1028 /**
1029  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1030  * @np:         a pointer to a device tree node.
1031  * @type:       the thermal cooling device type.
1032  * @devdata:    device private data.
1033  * @ops:                standard thermal cooling devices callbacks.
1034  *
1035  * This function will register a cooling device with device tree node reference.
1036  * This interface function adds a new thermal cooling device (fan/processor/...)
1037  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1038  * to all the thermal zone devices registered at the same time.
1039  *
1040  * Return: a pointer to the created struct thermal_cooling_device or an
1041  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1042  */
1043 struct thermal_cooling_device *
1044 thermal_of_cooling_device_register(struct device_node *np,
1045                                    char *type, void *devdata,
1046                                    const struct thermal_cooling_device_ops *ops)
1047 {
1048         return __thermal_cooling_device_register(np, type, devdata, ops);
1049 }
1050 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1051
1052 static void __unbind(struct thermal_zone_device *tz, int mask,
1053                      struct thermal_cooling_device *cdev)
1054 {
1055         int i;
1056
1057         for (i = 0; i < tz->trips; i++)
1058                 if (mask & (1 << i))
1059                         thermal_zone_unbind_cooling_device(tz, i, cdev);
1060 }
1061
1062 /**
1063  * thermal_cooling_device_unregister - removes a thermal cooling device
1064  * @cdev:       the thermal cooling device to remove.
1065  *
1066  * thermal_cooling_device_unregister() must be called when a registered
1067  * thermal cooling device is no longer needed.
1068  */
1069 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1070 {
1071         int i;
1072         const struct thermal_zone_params *tzp;
1073         struct thermal_zone_device *tz;
1074         struct thermal_cooling_device *pos = NULL;
1075
1076         if (!cdev)
1077                 return;
1078
1079         mutex_lock(&thermal_list_lock);
1080         list_for_each_entry(pos, &thermal_cdev_list, node)
1081                 if (pos == cdev)
1082                         break;
1083         if (pos != cdev) {
1084                 /* thermal cooling device not found */
1085                 mutex_unlock(&thermal_list_lock);
1086                 return;
1087         }
1088         list_del(&cdev->node);
1089
1090         /* Unbind all thermal zones associated with 'this' cdev */
1091         list_for_each_entry(tz, &thermal_tz_list, node) {
1092                 if (tz->ops->unbind) {
1093                         tz->ops->unbind(tz, cdev);
1094                         continue;
1095                 }
1096
1097                 if (!tz->tzp || !tz->tzp->tbp)
1098                         continue;
1099
1100                 tzp = tz->tzp;
1101                 for (i = 0; i < tzp->num_tbps; i++) {
1102                         if (tzp->tbp[i].cdev == cdev) {
1103                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1104                                 tzp->tbp[i].cdev = NULL;
1105                         }
1106                 }
1107         }
1108
1109         mutex_unlock(&thermal_list_lock);
1110
1111         ida_simple_remove(&thermal_cdev_ida, cdev->id);
1112         device_unregister(&cdev->device);
1113 }
1114 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1115
1116 static void bind_tz(struct thermal_zone_device *tz)
1117 {
1118         int i, ret;
1119         struct thermal_cooling_device *pos = NULL;
1120         const struct thermal_zone_params *tzp = tz->tzp;
1121
1122         if (!tzp && !tz->ops->bind)
1123                 return;
1124
1125         mutex_lock(&thermal_list_lock);
1126
1127         /* If there is ops->bind, try to use ops->bind */
1128         if (tz->ops->bind) {
1129                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1130                         ret = tz->ops->bind(tz, pos);
1131                         if (ret)
1132                                 print_bind_err_msg(tz, pos, ret);
1133                 }
1134                 goto exit;
1135         }
1136
1137         if (!tzp || !tzp->tbp)
1138                 goto exit;
1139
1140         list_for_each_entry(pos, &thermal_cdev_list, node) {
1141                 for (i = 0; i < tzp->num_tbps; i++) {
1142                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
1143                                 continue;
1144                         if (tzp->tbp[i].match(tz, pos))
1145                                 continue;
1146                         tzp->tbp[i].cdev = pos;
1147                         __bind(tz, tzp->tbp[i].trip_mask, pos,
1148                                tzp->tbp[i].binding_limits,
1149                                tzp->tbp[i].weight);
1150                 }
1151         }
1152 exit:
1153         mutex_unlock(&thermal_list_lock);
1154 }
1155
1156 /**
1157  * thermal_zone_device_register() - register a new thermal zone device
1158  * @type:       the thermal zone device type
1159  * @trips:      the number of trip points the thermal zone support
1160  * @mask:       a bit string indicating the writeablility of trip points
1161  * @devdata:    private device data
1162  * @ops:        standard thermal zone device callbacks
1163  * @tzp:        thermal zone platform parameters
1164  * @passive_delay: number of milliseconds to wait between polls when
1165  *                 performing passive cooling
1166  * @polling_delay: number of milliseconds to wait between polls when checking
1167  *                 whether trip points have been crossed (0 for interrupt
1168  *                 driven systems)
1169  *
1170  * This interface function adds a new thermal zone device (sensor) to
1171  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1172  * thermal cooling devices registered at the same time.
1173  * thermal_zone_device_unregister() must be called when the device is no
1174  * longer needed. The passive cooling depends on the .get_trend() return value.
1175  *
1176  * Return: a pointer to the created struct thermal_zone_device or an
1177  * in case of error, an ERR_PTR. Caller must check return value with
1178  * IS_ERR*() helpers.
1179  */
1180 struct thermal_zone_device *
1181 thermal_zone_device_register(const char *type, int trips, int mask,
1182                              void *devdata, struct thermal_zone_device_ops *ops,
1183                              struct thermal_zone_params *tzp, int passive_delay,
1184                              int polling_delay)
1185 {
1186         struct thermal_zone_device *tz;
1187         enum thermal_trip_type trip_type;
1188         int trip_temp;
1189         int result;
1190         int count;
1191         struct thermal_governor *governor;
1192
1193         if (!type || strlen(type) == 0)
1194                 return ERR_PTR(-EINVAL);
1195
1196         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1197                 return ERR_PTR(-EINVAL);
1198
1199         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1200                 return ERR_PTR(-EINVAL);
1201
1202         if (!ops)
1203                 return ERR_PTR(-EINVAL);
1204
1205         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1206                 return ERR_PTR(-EINVAL);
1207
1208         tz = kzalloc(sizeof(*tz), GFP_KERNEL);
1209         if (!tz)
1210                 return ERR_PTR(-ENOMEM);
1211
1212         INIT_LIST_HEAD(&tz->thermal_instances);
1213         ida_init(&tz->ida);
1214         mutex_init(&tz->lock);
1215         result = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL);
1216         if (result < 0) {
1217                 kfree(tz);
1218                 return ERR_PTR(result);
1219         }
1220
1221         tz->id = result;
1222         strlcpy(tz->type, type, sizeof(tz->type));
1223         tz->ops = ops;
1224         tz->tzp = tzp;
1225         tz->device.class = &thermal_class;
1226         tz->devdata = devdata;
1227         tz->trips = trips;
1228         tz->passive_delay = passive_delay;
1229         tz->polling_delay = polling_delay;
1230
1231         /* sys I/F */
1232         /* Add nodes that are always present via .groups */
1233         result = thermal_zone_create_device_groups(tz, mask);
1234         if (result)
1235                 goto unregister;
1236
1237         /* A new thermal zone needs to be updated anyway. */
1238         atomic_set(&tz->need_update, 1);
1239
1240         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1241         result = device_register(&tz->device);
1242         if (result) {
1243                 ida_simple_remove(&thermal_tz_ida, tz->id);
1244                 kfree(tz);
1245                 return ERR_PTR(result);
1246         }
1247
1248         for (count = 0; count < trips; count++) {
1249                 if (tz->ops->get_trip_type(tz, count, &trip_type))
1250                         set_bit(count, &tz->trips_disabled);
1251                 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1252                         set_bit(count, &tz->trips_disabled);
1253                 /* Check for bogus trip points */
1254                 if (trip_temp == 0)
1255                         set_bit(count, &tz->trips_disabled);
1256         }
1257
1258         /* Update 'this' zone's governor information */
1259         mutex_lock(&thermal_governor_lock);
1260
1261         if (tz->tzp)
1262                 governor = __find_governor(tz->tzp->governor_name);
1263         else
1264                 governor = def_governor;
1265
1266         result = thermal_set_governor(tz, governor);
1267         if (result) {
1268                 mutex_unlock(&thermal_governor_lock);
1269                 goto unregister;
1270         }
1271
1272         mutex_unlock(&thermal_governor_lock);
1273
1274         if (!tz->tzp || !tz->tzp->no_hwmon) {
1275                 result = thermal_add_hwmon_sysfs(tz);
1276                 if (result)
1277                         goto unregister;
1278         }
1279
1280         mutex_lock(&thermal_list_lock);
1281         list_add_tail(&tz->node, &thermal_tz_list);
1282         mutex_unlock(&thermal_list_lock);
1283
1284         /* Bind cooling devices for this zone */
1285         bind_tz(tz);
1286
1287         INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check);
1288
1289         thermal_zone_device_reset(tz);
1290         /* Update the new thermal zone and mark it as already updated. */
1291         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1292                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
1293
1294         return tz;
1295
1296 unregister:
1297         ida_simple_remove(&thermal_tz_ida, tz->id);
1298         device_unregister(&tz->device);
1299         return ERR_PTR(result);
1300 }
1301 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1302
1303 /**
1304  * thermal_device_unregister - removes the registered thermal zone device
1305  * @tz: the thermal zone device to remove
1306  */
1307 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1308 {
1309         int i;
1310         const struct thermal_zone_params *tzp;
1311         struct thermal_cooling_device *cdev;
1312         struct thermal_zone_device *pos = NULL;
1313
1314         if (!tz)
1315                 return;
1316
1317         tzp = tz->tzp;
1318
1319         mutex_lock(&thermal_list_lock);
1320         list_for_each_entry(pos, &thermal_tz_list, node)
1321                 if (pos == tz)
1322                         break;
1323         if (pos != tz) {
1324                 /* thermal zone device not found */
1325                 mutex_unlock(&thermal_list_lock);
1326                 return;
1327         }
1328         list_del(&tz->node);
1329
1330         /* Unbind all cdevs associated with 'this' thermal zone */
1331         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1332                 if (tz->ops->unbind) {
1333                         tz->ops->unbind(tz, cdev);
1334                         continue;
1335                 }
1336
1337                 if (!tzp || !tzp->tbp)
1338                         break;
1339
1340                 for (i = 0; i < tzp->num_tbps; i++) {
1341                         if (tzp->tbp[i].cdev == cdev) {
1342                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1343                                 tzp->tbp[i].cdev = NULL;
1344                         }
1345                 }
1346         }
1347
1348         mutex_unlock(&thermal_list_lock);
1349
1350         thermal_zone_device_set_polling(tz, 0);
1351
1352         thermal_set_governor(tz, NULL);
1353
1354         thermal_remove_hwmon_sysfs(tz);
1355         ida_simple_remove(&thermal_tz_ida, tz->id);
1356         ida_destroy(&tz->ida);
1357         mutex_destroy(&tz->lock);
1358         device_unregister(&tz->device);
1359 }
1360 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1361
1362 /**
1363  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1364  * @name: thermal zone name to fetch the temperature
1365  *
1366  * When only one zone is found with the passed name, returns a reference to it.
1367  *
1368  * Return: On success returns a reference to an unique thermal zone with
1369  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1370  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1371  */
1372 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1373 {
1374         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1375         unsigned int found = 0;
1376
1377         if (!name)
1378                 goto exit;
1379
1380         mutex_lock(&thermal_list_lock);
1381         list_for_each_entry(pos, &thermal_tz_list, node)
1382                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1383                         found++;
1384                         ref = pos;
1385                 }
1386         mutex_unlock(&thermal_list_lock);
1387
1388         /* nothing has been found, thus an error code for it */
1389         if (found == 0)
1390                 ref = ERR_PTR(-ENODEV);
1391         else if (found > 1)
1392         /* Success only when an unique zone is found */
1393                 ref = ERR_PTR(-EEXIST);
1394
1395 exit:
1396         return ref;
1397 }
1398 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1399
1400 #ifdef CONFIG_NET
1401 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1402         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1403 };
1404
1405 static struct genl_family thermal_event_genl_family __ro_after_init = {
1406         .module = THIS_MODULE,
1407         .name = THERMAL_GENL_FAMILY_NAME,
1408         .version = THERMAL_GENL_VERSION,
1409         .maxattr = THERMAL_GENL_ATTR_MAX,
1410         .mcgrps = thermal_event_mcgrps,
1411         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1412 };
1413
1414 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1415                                    enum events event)
1416 {
1417         struct sk_buff *skb;
1418         struct nlattr *attr;
1419         struct thermal_genl_event *thermal_event;
1420         void *msg_header;
1421         int size;
1422         int result;
1423         static unsigned int thermal_event_seqnum;
1424
1425         if (!tz)
1426                 return -EINVAL;
1427
1428         /* allocate memory */
1429         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1430                nla_total_size(0);
1431
1432         skb = genlmsg_new(size, GFP_ATOMIC);
1433         if (!skb)
1434                 return -ENOMEM;
1435
1436         /* add the genetlink message header */
1437         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1438                                  &thermal_event_genl_family, 0,
1439                                  THERMAL_GENL_CMD_EVENT);
1440         if (!msg_header) {
1441                 nlmsg_free(skb);
1442                 return -ENOMEM;
1443         }
1444
1445         /* fill the data */
1446         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1447                            sizeof(struct thermal_genl_event));
1448
1449         if (!attr) {
1450                 nlmsg_free(skb);
1451                 return -EINVAL;
1452         }
1453
1454         thermal_event = nla_data(attr);
1455         if (!thermal_event) {
1456                 nlmsg_free(skb);
1457                 return -EINVAL;
1458         }
1459
1460         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1461
1462         thermal_event->orig = tz->id;
1463         thermal_event->event = event;
1464
1465         /* send multicast genetlink message */
1466         genlmsg_end(skb, msg_header);
1467
1468         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1469                                    0, GFP_ATOMIC);
1470         if (result)
1471                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1472
1473         return result;
1474 }
1475 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1476
1477 static int __init genetlink_init(void)
1478 {
1479         return genl_register_family(&thermal_event_genl_family);
1480 }
1481
1482 static void genetlink_exit(void)
1483 {
1484         genl_unregister_family(&thermal_event_genl_family);
1485 }
1486 #else /* !CONFIG_NET */
1487 static inline int genetlink_init(void) { return 0; }
1488 static inline void genetlink_exit(void) {}
1489 #endif /* !CONFIG_NET */
1490
1491 static int thermal_pm_notify(struct notifier_block *nb,
1492                              unsigned long mode, void *_unused)
1493 {
1494         struct thermal_zone_device *tz;
1495
1496         switch (mode) {
1497         case PM_HIBERNATION_PREPARE:
1498         case PM_RESTORE_PREPARE:
1499         case PM_SUSPEND_PREPARE:
1500                 atomic_set(&in_suspend, 1);
1501                 break;
1502         case PM_POST_HIBERNATION:
1503         case PM_POST_RESTORE:
1504         case PM_POST_SUSPEND:
1505                 atomic_set(&in_suspend, 0);
1506                 list_for_each_entry(tz, &thermal_tz_list, node) {
1507                         thermal_zone_device_reset(tz);
1508                         thermal_zone_device_update(tz,
1509                                                    THERMAL_EVENT_UNSPECIFIED);
1510                 }
1511                 break;
1512         default:
1513                 break;
1514         }
1515         return 0;
1516 }
1517
1518 static struct notifier_block thermal_pm_nb = {
1519         .notifier_call = thermal_pm_notify,
1520 };
1521
1522 static int __init thermal_init(void)
1523 {
1524         int result;
1525
1526         mutex_init(&poweroff_lock);
1527         result = thermal_register_governors();
1528         if (result)
1529                 goto error;
1530
1531         result = class_register(&thermal_class);
1532         if (result)
1533                 goto unregister_governors;
1534
1535         result = genetlink_init();
1536         if (result)
1537                 goto unregister_class;
1538
1539         result = of_parse_thermal_zones();
1540         if (result)
1541                 goto exit_netlink;
1542
1543         result = register_pm_notifier(&thermal_pm_nb);
1544         if (result)
1545                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
1546                         result);
1547
1548         return 0;
1549
1550 exit_netlink:
1551         genetlink_exit();
1552 unregister_class:
1553         class_unregister(&thermal_class);
1554 unregister_governors:
1555         thermal_unregister_governors();
1556 error:
1557         ida_destroy(&thermal_tz_ida);
1558         ida_destroy(&thermal_cdev_ida);
1559         mutex_destroy(&thermal_list_lock);
1560         mutex_destroy(&thermal_governor_lock);
1561         mutex_destroy(&poweroff_lock);
1562         return result;
1563 }
1564
1565 static void __exit thermal_exit(void)
1566 {
1567         unregister_pm_notifier(&thermal_pm_nb);
1568         of_thermal_destroy_zones();
1569         genetlink_exit();
1570         class_unregister(&thermal_class);
1571         thermal_unregister_governors();
1572         ida_destroy(&thermal_tz_ida);
1573         ida_destroy(&thermal_cdev_ida);
1574         mutex_destroy(&thermal_list_lock);
1575         mutex_destroy(&thermal_governor_lock);
1576 }
1577
1578 fs_initcall(thermal_init);
1579 module_exit(thermal_exit);