drivers/thermal/thermal_core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  thermal.c - Generic Thermal Management Sysfs support.
   4  *
   5  *  Copyright (C) 2008 Intel Corp
   6  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   7  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/module.h>
  13 #include <linux/device.h>
  14 #include <linux/err.h>
  15 #include <linux/slab.h>
  16 #include <linux/kdev_t.h>
  17 #include <linux/idr.h>
  18 #include <linux/thermal.h>
  19 #include <linux/reboot.h>
  20 #include <linux/string.h>
  21 #include <linux/of.h>
  22 #include <net/netlink.h>
  23 #include <net/genetlink.h>
  24 #include <linux/suspend.h>
  25
  26 #define CREATE_TRACE_POINTS
  27 #include <trace/events/thermal.h>
  28
  29 #include "thermal_core.h"
  30 #include "thermal_hwmon.h"
  31
  32 MODULE_AUTHOR("Zhang Rui");
  33 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  34 MODULE_LICENSE("GPL v2");
  35
  36 static DEFINE_IDA(thermal_tz_ida);
  37 static DEFINE_IDA(thermal_cdev_ida);
  38
  39 static LIST_HEAD(thermal_tz_list);
  40 static LIST_HEAD(thermal_cdev_list);
  41 static LIST_HEAD(thermal_governor_list);
  42
  43 static DEFINE_MUTEX(thermal_list_lock);
  44 static DEFINE_MUTEX(thermal_governor_lock);
  45 static DEFINE_MUTEX(poweroff_lock);
  46
  47 static atomic_t in_suspend;
  48 static bool power_off_triggered;
  49
  50 static struct thermal_governor *def_governor;
  51
  52 /*
  53  * Governor section: set of functions to handle thermal governors
  54  *
  55  * Functions to help in the life cycle of thermal governors within
  56  * the thermal core and by the thermal governor code.
  57  */
  58
  59 static struct thermal_governor *__find_governor(const char *name)
  60 {
  61         struct thermal_governor *pos;
  62
  63         if (!name || !name[0])
  64                 return def_governor;
  65
  66         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  67                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  68                         return pos;
  69
  70         return NULL;
  71 }
  72
  73 /**
  74  * bind_previous_governor() - bind the previous governor of the thermal zone
  75  * @tz:         a valid pointer to a struct thermal_zone_device
  76  * @failed_gov_name:    the name of the governor that failed to register
  77  *
  78  * Register the previous governor of the thermal zone after a new
  79  * governor has failed to be bound.
  80  */
  81 static void bind_previous_governor(struct thermal_zone_device *tz,
  82                                    const char *failed_gov_name)
  83 {
  84         if (tz->governor && tz->governor->bind_to_tz) {
  85                 if (tz->governor->bind_to_tz(tz)) {
  86                         dev_err(&tz->device,
  87                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  88                                 failed_gov_name, tz->governor->name, tz->type);
  89                         tz->governor = NULL;
  90                 }
  91         }
  92 }
  93
  94 /**
  95  * thermal_set_governor() - Switch to another governor
  96  * @tz:         a valid pointer to a struct thermal_zone_device
  97  * @new_gov:    pointer to the new governor
  98  *
  99  * Change the governor of thermal zone @tz.
 100  *
 101  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
 102  */
 103 static int thermal_set_governor(struct thermal_zone_device *tz,
 104                                 struct thermal_governor *new_gov)
 105 {
 106         int ret = 0;
 107
 108         if (tz->governor && tz->governor->unbind_from_tz)
 109                 tz->governor->unbind_from_tz(tz);
 110
 111         if (new_gov && new_gov->bind_to_tz) {
 112                 ret = new_gov->bind_to_tz(tz);
 113                 if (ret) {
 114                         bind_previous_governor(tz, new_gov->name);
 115
 116                         return ret;
 117                 }
 118         }
 119
 120         tz->governor = new_gov;
 121
 122         return ret;
 123 }
 124
 125 int thermal_register_governor(struct thermal_governor *governor)
 126 {
 127         int err;
 128         const char *name;
 129         struct thermal_zone_device *pos;
 130
 131         if (!governor)
 132                 return -EINVAL;
 133
 134         mutex_lock(&thermal_governor_lock);
 135
 136         err = -EBUSY;
 137         if (!__find_governor(governor->name)) {
 138                 bool match_default;
 139
 140                 err = 0;
 141                 list_add(&governor->governor_list, &thermal_governor_list);
 142                 match_default = !strncmp(governor->name,
 143                                          DEFAULT_THERMAL_GOVERNOR,
 144                                          THERMAL_NAME_LENGTH);
 145
 146                 if (!def_governor && match_default)
 147                         def_governor = governor;
 148         }
 149
 150         mutex_lock(&thermal_list_lock);
 151
 152         list_for_each_entry(pos, &thermal_tz_list, node) {
 153                 /*
 154                  * only thermal zones with specified tz->tzp->governor_name
 155                  * may run with tz->govenor unset
 156                  */
 157                 if (pos->governor)
 158                         continue;
 159
 160                 name = pos->tzp->governor_name;
 161
 162                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 163                         int ret;
 164
 165                         ret = thermal_set_governor(pos, governor);
 166                         if (ret)
 167                                 dev_err(&pos->device,
 168                                         "Failed to set governor %s for thermal zone %s: %d\n",
 169                                         governor->name, pos->type, ret);
 170                 }
 171         }
 172
 173         mutex_unlock(&thermal_list_lock);
 174         mutex_unlock(&thermal_governor_lock);
 175
 176         return err;
 177 }
 178
 179 void thermal_unregister_governor(struct thermal_governor *governor)
 180 {
 181         struct thermal_zone_device *pos;
 182
 183         if (!governor)
 184                 return;
 185
 186         mutex_lock(&thermal_governor_lock);
 187
 188         if (!__find_governor(governor->name))
 189                 goto exit;
 190
 191         mutex_lock(&thermal_list_lock);
 192
 193         list_for_each_entry(pos, &thermal_tz_list, node) {
 194                 if (!strncasecmp(pos->governor->name, governor->name,
 195                                  THERMAL_NAME_LENGTH))
 196                         thermal_set_governor(pos, NULL);
 197         }
 198
 199         mutex_unlock(&thermal_list_lock);
 200         list_del(&governor->governor_list);
 201 exit:
 202         mutex_unlock(&thermal_governor_lock);
 203 }
 204
 205 int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
 206                                    char *policy)
 207 {
 208         struct thermal_governor *gov;
 209         int ret = -EINVAL;
 210
 211         mutex_lock(&thermal_governor_lock);
 212         mutex_lock(&tz->lock);
 213
 214         gov = __find_governor(strim(policy));
 215         if (!gov)
 216                 goto exit;
 217
 218         ret = thermal_set_governor(tz, gov);
 219
 220 exit:
 221         mutex_unlock(&tz->lock);
 222         mutex_unlock(&thermal_governor_lock);
 223
 224         return ret;
 225 }
 226
 227 int thermal_build_list_of_policies(char *buf)
 228 {
 229         struct thermal_governor *pos;
 230         ssize_t count = 0;
 231         ssize_t size = PAGE_SIZE;
 232
 233         mutex_lock(&thermal_governor_lock);
 234
 235         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 236                 size = PAGE_SIZE - count;
 237                 count += scnprintf(buf + count, size, "%s ", pos->name);
 238         }
 239         count += scnprintf(buf + count, size, "\n");
 240
 241         mutex_unlock(&thermal_governor_lock);
 242
 243         return count;
 244 }
 245
 246 static int __init thermal_register_governors(void)
 247 {
 248         int result;
 249
 250         result = thermal_gov_step_wise_register();
 251         if (result)
 252                 return result;
 253
 254         result = thermal_gov_fair_share_register();
 255         if (result)
 256                 return result;
 257
 258         result = thermal_gov_bang_bang_register();
 259         if (result)
 260                 return result;
 261
 262         result = thermal_gov_user_space_register();
 263         if (result)
 264                 return result;
 265
 266         return thermal_gov_power_allocator_register();
 267 }
 268
 269 static void thermal_unregister_governors(void)
 270 {
 271         thermal_gov_step_wise_unregister();
 272         thermal_gov_fair_share_unregister();
 273         thermal_gov_bang_bang_unregister();
 274         thermal_gov_user_space_unregister();
 275         thermal_gov_power_allocator_unregister();
 276 }
 277
 278 /*
 279  * Zone update section: main control loop applied to each zone while monitoring
 280  *
 281  * in polling mode. The monitoring is done using a workqueue.
 282  * Same update may be done on a zone by calling thermal_zone_device_update().
 283  *
 284  * An update means:
 285  * - Non-critical trips will invoke the governor responsible for that zone;
 286  * - Hot trips will produce a notification to userspace;
 287  * - Critical trip point will cause a system shutdown.
 288  */
 289 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 290                                             int delay)
 291 {
 292         if (delay > 1000)
 293                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 294                                  round_jiffies(msecs_to_jiffies(delay)));
 295         else if (delay)
 296                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 297                                  msecs_to_jiffies(delay));
 298         else
 299                 cancel_delayed_work(&tz->poll_queue);
 300 }
 301
 302 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 303 {
 304         mutex_lock(&tz->lock);
 305
 306         if (tz->passive)
 307                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 308         else if (tz->polling_delay)
 309                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 310         else
 311                 thermal_zone_device_set_polling(tz, 0);
 312
 313         mutex_unlock(&tz->lock);
 314 }
 315
 316 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 317                                       int trip,
 318                                       enum thermal_trip_type trip_type)
 319 {
 320         tz->governor ? tz->governor->throttle(tz, trip) :
 321                        def_governor->throttle(tz, trip);
 322 }
 323
 324 /**
 325  * thermal_emergency_poweroff_func - emergency poweroff work after a known delay
 326  * @work: work_struct associated with the emergency poweroff function
 327  *
 328  * This function is called in very critical situations to force
 329  * a kernel poweroff after a configurable timeout value.
 330  */
 331 static void thermal_emergency_poweroff_func(struct work_struct *work)
 332 {
 333         /*
 334          * We have reached here after the emergency thermal shutdown
 335          * Waiting period has expired. This means orderly_poweroff has
 336          * not been able to shut off the system for some reason.
 337          * Try to shut down the system immediately using kernel_power_off
 338          * if populated
 339          */
 340         WARN(1, "Attempting kernel_power_off: Temperature too high\n");
 341         kernel_power_off();
 342
 343         /*
 344          * Worst of the worst case trigger emergency restart
 345          */
 346         WARN(1, "Attempting emergency_restart: Temperature too high\n");
 347         emergency_restart();
 348 }
 349
 350 static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work,
 351                             thermal_emergency_poweroff_func);
 352
 353 /**
 354  * thermal_emergency_poweroff - Trigger an emergency system poweroff
 355  *
 356  * This may be called from any critical situation to trigger a system shutdown
 357  * after a known period of time. By default this is not scheduled.
 358  */
 359 static void thermal_emergency_poweroff(void)
 360 {
 361         int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS;
 362         /*
 363          * poweroff_delay_ms must be a carefully profiled positive value.
 364          * Its a must for thermal_emergency_poweroff_work to be scheduled
 365          */
 366         if (poweroff_delay_ms <= 0)
 367                 return;
 368         schedule_delayed_work(&thermal_emergency_poweroff_work,
 369                               msecs_to_jiffies(poweroff_delay_ms));
 370 }
 371
 372 static void handle_critical_trips(struct thermal_zone_device *tz,
 373                                   int trip, enum thermal_trip_type trip_type)
 374 {
 375         int trip_temp;
 376
 377         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 378
 379         /* If we have not crossed the trip_temp, we do not care. */
 380         if (trip_temp <= 0 || tz->temperature < trip_temp)
 381                 return;
 382
 383         trace_thermal_zone_trip(tz, trip, trip_type);
 384
 385         if (tz->ops->notify)
 386                 tz->ops->notify(tz, trip, trip_type);
 387
 388         if (trip_type == THERMAL_TRIP_CRITICAL) {
 389                 dev_emerg(&tz->device,
 390                           "critical temperature reached (%d C), shutting down\n",
 391                           tz->temperature / 1000);
 392                 mutex_lock(&poweroff_lock);
 393                 if (!power_off_triggered) {
 394                         /*
 395                          * Queue a backup emergency shutdown in the event of
 396                          * orderly_poweroff failure
 397                          */
 398                         thermal_emergency_poweroff();
 399                         orderly_poweroff(true);
 400                         power_off_triggered = true;
 401                 }
 402                 mutex_unlock(&poweroff_lock);
 403         }
 404 }
 405
 406 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 407 {
 408         enum thermal_trip_type type;
 409
 410         /* Ignore disabled trip points */
 411         if (test_bit(trip, &tz->trips_disabled))
 412                 return;
 413
 414         tz->ops->get_trip_type(tz, trip, &type);
 415
 416         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 417                 handle_critical_trips(tz, trip, type);
 418         else
 419                 handle_non_critical_trips(tz, trip, type);
 420         /*
 421          * Alright, we handled this trip successfully.
 422          * So, start monitoring again.
 423          */
 424         monitor_thermal_zone(tz);
 425 }
 426
 427 static void update_temperature(struct thermal_zone_device *tz)
 428 {
 429         int temp, ret;
 430
 431         ret = thermal_zone_get_temp(tz, &temp);
 432         if (ret) {
 433                 if (ret != -EAGAIN)
 434                         dev_warn(&tz->device,
 435                                  "failed to read out thermal zone (%d)\n",
 436                                  ret);
 437                 return;
 438         }
 439
 440         mutex_lock(&tz->lock);
 441         tz->last_temperature = tz->temperature;
 442         tz->temperature = temp;
 443         mutex_unlock(&tz->lock);
 444
 445         trace_thermal_temperature(tz);
 446         if (tz->last_temperature == THERMAL_TEMP_INVALID)
 447                 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
 448                         tz->temperature);
 449         else
 450                 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 451                         tz->last_temperature, tz->temperature);
 452 }
 453
 454 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 455 {
 456         struct thermal_instance *pos;
 457
 458         tz->temperature = THERMAL_TEMP_INVALID;
 459         tz->passive = 0;
 460         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 461                 pos->initialized = false;
 462 }
 463
 464 void thermal_zone_device_update(struct thermal_zone_device *tz,
 465                                 enum thermal_notify_event event)
 466 {
 467         int count;
 468
 469         if (atomic_read(&in_suspend))
 470                 return;
 471
 472         if (!tz->ops->get_temp)
 473                 return;
 474
 475         update_temperature(tz);
 476
 477         thermal_zone_set_trips(tz);
 478
 479         tz->notify_event = event;
 480
 481         for (count = 0; count < tz->trips; count++)
 482                 handle_thermal_trip(tz, count);
 483 }
 484 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 485
 486 /**
 487  * thermal_notify_framework - Sensor drivers use this API to notify framework
 488  * @tz:         thermal zone device
 489  * @trip:       indicates which trip point has been crossed
 490  *
 491  * This function handles the trip events from sensor drivers. It starts
 492  * throttling the cooling devices according to the policy configured.
 493  * For CRITICAL and HOT trip points, this notifies the respective drivers,
 494  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
 495  * The throttling policy is based on the configured platform data; if no
 496  * platform data is provided, this uses the step_wise throttling policy.
 497  */
 498 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
 499 {
 500         handle_thermal_trip(tz, trip);
 501 }
 502 EXPORT_SYMBOL_GPL(thermal_notify_framework);
 503
 504 static void thermal_zone_device_check(struct work_struct *work)
 505 {
 506         struct thermal_zone_device *tz = container_of(work, struct
 507                                                       thermal_zone_device,
 508                                                       poll_queue.work);
 509         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 510 }
 511
 512 /*
 513  * Power actor section: interface to power actors to estimate power
 514  *
 515  * Set of functions used to interact to cooling devices that know
 516  * how to estimate their devices power consumption.
 517  */
 518
 519 /**
 520  * power_actor_get_max_power() - get the maximum power that a cdev can consume
 521  * @cdev:       pointer to &thermal_cooling_device
 522  * @tz:         a valid thermal zone device pointer
 523  * @max_power:  pointer in which to store the maximum power
 524  *
 525  * Calculate the maximum power consumption in milliwats that the
 526  * cooling device can currently consume and store it in @max_power.
 527  *
 528  * Return: 0 on success, -EINVAL if @cdev doesn't support the
 529  * power_actor API or -E* on other error.
 530  */
 531 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 532                               struct thermal_zone_device *tz, u32 *max_power)
 533 {
 534         if (!cdev_is_power_actor(cdev))
 535                 return -EINVAL;
 536
 537         return cdev->ops->state2power(cdev, tz, 0, max_power);
 538 }
 539
 540 /**
 541  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
 542  * @cdev:       pointer to &thermal_cooling_device
 543  * @tz:         a valid thermal zone device pointer
 544  * @min_power:  pointer in which to store the minimum power
 545  *
 546  * Calculate the minimum power consumption in milliwatts that the
 547  * cooling device can currently consume and store it in @min_power.
 548  *
 549  * Return: 0 on success, -EINVAL if @cdev doesn't support the
 550  * power_actor API or -E* on other error.
 551  */
 552 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
 553                               struct thermal_zone_device *tz, u32 *min_power)
 554 {
 555         unsigned long max_state;
 556         int ret;
 557
 558         if (!cdev_is_power_actor(cdev))
 559                 return -EINVAL;
 560
 561         ret = cdev->ops->get_max_state(cdev, &max_state);
 562         if (ret)
 563                 return ret;
 564
 565         return cdev->ops->state2power(cdev, tz, max_state, min_power);
 566 }
 567
 568 /**
 569  * power_actor_set_power() - limit the maximum power a cooling device consumes
 570  * @cdev:       pointer to &thermal_cooling_device
 571  * @instance:   thermal instance to update
 572  * @power:      the power in milliwatts
 573  *
 574  * Set the cooling device to consume at most @power milliwatts. The limit is
 575  * expected to be a cap at the maximum power consumption.
 576  *
 577  * Return: 0 on success, -EINVAL if the cooling device does not
 578  * implement the power actor API or -E* for other failures.
 579  */
 580 int power_actor_set_power(struct thermal_cooling_device *cdev,
 581                           struct thermal_instance *instance, u32 power)
 582 {
 583         unsigned long state;
 584         int ret;
 585
 586         if (!cdev_is_power_actor(cdev))
 587                 return -EINVAL;
 588
 589         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
 590         if (ret)
 591                 return ret;
 592
 593         instance->target = state;
 594         mutex_lock(&cdev->lock);
 595         cdev->updated = false;
 596         mutex_unlock(&cdev->lock);
 597         thermal_cdev_update(cdev);
 598
 599         return 0;
 600 }
 601
 602 void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz,
 603                                           const char *cdev_type, size_t size)
 604 {
 605         struct thermal_cooling_device *cdev = NULL;
 606
 607         mutex_lock(&thermal_list_lock);
 608         list_for_each_entry(cdev, &thermal_cdev_list, node) {
 609                 /* skip non matching cdevs */
 610                 if (strncmp(cdev_type, cdev->type, size))
 611                         continue;
 612
 613                 /* re binding the exception matching the type pattern */
 614                 thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev,
 615                                                  THERMAL_NO_LIMIT,
 616                                                  THERMAL_NO_LIMIT,
 617                                                  THERMAL_WEIGHT_DEFAULT);
 618         }
 619         mutex_unlock(&thermal_list_lock);
 620 }
 621
 622 void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,
 623                                           const char *cdev_type, size_t size)
 624 {
 625         struct thermal_cooling_device *cdev = NULL;
 626
 627         mutex_lock(&thermal_list_lock);
 628         list_for_each_entry(cdev, &thermal_cdev_list, node) {
 629                 /* skip non matching cdevs */
 630                 if (strncmp(cdev_type, cdev->type, size))
 631                         continue;
 632                 /* unbinding the exception matching the type pattern */
 633                 thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE,
 634                                                    cdev);
 635         }
 636         mutex_unlock(&thermal_list_lock);
 637 }
 638
 639 /*
 640  * Device management section: cooling devices, zones devices, and binding
 641  *
 642  * Set of functions provided by the thermal core for:
 643  * - cooling devices lifecycle: registration, unregistration,
 644  *                              binding, and unbinding.
 645  * - thermal zone devices lifecycle: registration, unregistration,
 646  *                                   binding, and unbinding.
 647  */
 648
 649 /**
 650  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
 651  * @tz:         pointer to struct thermal_zone_device
 652  * @trip:       indicates which trip point the cooling devices is
 653  *              associated with in this thermal zone.
 654  * @cdev:       pointer to struct thermal_cooling_device
 655  * @upper:      the Maximum cooling state for this trip point.
 656  *              THERMAL_NO_LIMIT means no upper limit,
 657  *              and the cooling device can be in max_state.
 658  * @lower:      the Minimum cooling state can be used for this trip point.
 659  *              THERMAL_NO_LIMIT means no lower limit,
 660  *              and the cooling device can be in cooling state 0.
 661  * @weight:     The weight of the cooling device to be bound to the
 662  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
 663  *              default value
 664  *
 665  * This interface function bind a thermal cooling device to the certain trip
 666  * point of a thermal zone device.
 667  * This function is usually called in the thermal zone device .bind callback.
 668  *
 669  * Return: 0 on success, the proper error value otherwise.
 670  */
 671 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 672                                      int trip,
 673                                      struct thermal_cooling_device *cdev,
 674                                      unsigned long upper, unsigned long lower,
 675                                      unsigned int weight)
 676 {
 677         struct thermal_instance *dev;
 678         struct thermal_instance *pos;
 679         struct thermal_zone_device *pos1;
 680         struct thermal_cooling_device *pos2;
 681         unsigned long max_state;
 682         int result, ret;
 683
 684         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 685                 return -EINVAL;
 686
 687         list_for_each_entry(pos1, &thermal_tz_list, node) {
 688                 if (pos1 == tz)
 689                         break;
 690         }
 691         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 692                 if (pos2 == cdev)
 693                         break;
 694         }
 695
 696         if (tz != pos1 || cdev != pos2)
 697                 return -EINVAL;
 698
 699         ret = cdev->ops->get_max_state(cdev, &max_state);
 700         if (ret)
 701                 return ret;
 702
 703         /* lower default 0, upper default max_state */
 704         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 705         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 706
 707         if (lower > upper || upper > max_state)
 708                 return -EINVAL;
 709
 710         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 711         if (!dev)
 712                 return -ENOMEM;
 713         dev->tz = tz;
 714         dev->cdev = cdev;
 715         dev->trip = trip;
 716         dev->upper = upper;
 717         dev->lower = lower;
 718         dev->target = THERMAL_NO_TARGET;
 719         dev->weight = weight;
 720
 721         result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL);
 722         if (result < 0)
 723                 goto free_mem;
 724
 725         dev->id = result;
 726         sprintf(dev->name, "cdev%d", dev->id);
 727         result =
 728             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 729         if (result)
 730                 goto release_ida;
 731
 732         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 733         sysfs_attr_init(&dev->attr.attr);
 734         dev->attr.attr.name = dev->attr_name;
 735         dev->attr.attr.mode = 0444;
 736         dev->attr.show = trip_point_show;
 737         result = device_create_file(&tz->device, &dev->attr);
 738         if (result)
 739                 goto remove_symbol_link;
 740
 741         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
 742         sysfs_attr_init(&dev->weight_attr.attr);
 743         dev->weight_attr.attr.name = dev->weight_attr_name;
 744         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
 745         dev->weight_attr.show = weight_show;
 746         dev->weight_attr.store = weight_store;
 747         result = device_create_file(&tz->device, &dev->weight_attr);
 748         if (result)
 749                 goto remove_trip_file;
 750
 751         mutex_lock(&tz->lock);
 752         mutex_lock(&cdev->lock);
 753         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 754                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 755                         result = -EEXIST;
 756                         break;
 757                 }
 758         if (!result) {
 759                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 760                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 761                 atomic_set(&tz->need_update, 1);
 762         }
 763         mutex_unlock(&cdev->lock);
 764         mutex_unlock(&tz->lock);
 765
 766         if (!result)
 767                 return 0;
 768
 769         device_remove_file(&tz->device, &dev->weight_attr);
 770 remove_trip_file:
 771         device_remove_file(&tz->device, &dev->attr);
 772 remove_symbol_link:
 773         sysfs_remove_link(&tz->device.kobj, dev->name);
 774 release_ida:
 775         ida_simple_remove(&tz->ida, dev->id);
 776 free_mem:
 777         kfree(dev);
 778         return result;
 779 }
 780 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
 781
 782 /**
 783  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
 784  *                                        thermal zone.
 785  * @tz:         pointer to a struct thermal_zone_device.
 786  * @trip:       indicates which trip point the cooling devices is
 787  *              associated with in this thermal zone.
 788  * @cdev:       pointer to a struct thermal_cooling_device.
 789  *
 790  * This interface function unbind a thermal cooling device from the certain
 791  * trip point of a thermal zone device.
 792  * This function is usually called in the thermal zone device .unbind callback.
 793  *
 794  * Return: 0 on success, the proper error value otherwise.
 795  */
 796 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 797                                        int trip,
 798                                        struct thermal_cooling_device *cdev)
 799 {
 800         struct thermal_instance *pos, *next;
 801
 802         mutex_lock(&tz->lock);
 803         mutex_lock(&cdev->lock);
 804         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 805                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 806                         list_del(&pos->tz_node);
 807                         list_del(&pos->cdev_node);
 808                         mutex_unlock(&cdev->lock);
 809                         mutex_unlock(&tz->lock);
 810                         goto unbind;
 811                 }
 812         }
 813         mutex_unlock(&cdev->lock);
 814         mutex_unlock(&tz->lock);
 815
 816         return -ENODEV;
 817
 818 unbind:
 819         device_remove_file(&tz->device, &pos->weight_attr);
 820         device_remove_file(&tz->device, &pos->attr);
 821         sysfs_remove_link(&tz->device.kobj, pos->name);
 822         ida_simple_remove(&tz->ida, pos->id);
 823         kfree(pos);
 824         return 0;
 825 }
 826 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
 827
 828 static void thermal_release(struct device *dev)
 829 {
 830         struct thermal_zone_device *tz;
 831         struct thermal_cooling_device *cdev;
 832
 833         if (!strncmp(dev_name(dev), "thermal_zone",
 834                      sizeof("thermal_zone") - 1)) {
 835                 tz = to_thermal_zone(dev);
 836                 thermal_zone_destroy_device_groups(tz);
 837                 kfree(tz);
 838         } else if (!strncmp(dev_name(dev), "cooling_device",
 839                             sizeof("cooling_device") - 1)) {
 840                 cdev = to_cooling_device(dev);
 841                 kfree(cdev);
 842         }
 843 }
 844
 845 static struct class thermal_class = {
 846         .name = "thermal",
 847         .dev_release = thermal_release,
 848 };
 849
 850 static inline
 851 void print_bind_err_msg(struct thermal_zone_device *tz,
 852                         struct thermal_cooling_device *cdev, int ret)
 853 {
 854         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 855                 tz->type, cdev->type, ret);
 856 }
 857
 858 static void __bind(struct thermal_zone_device *tz, int mask,
 859                    struct thermal_cooling_device *cdev,
 860                    unsigned long *limits,
 861                    unsigned int weight)
 862 {
 863         int i, ret;
 864
 865         for (i = 0; i < tz->trips; i++) {
 866                 if (mask & (1 << i)) {
 867                         unsigned long upper, lower;
 868
 869                         upper = THERMAL_NO_LIMIT;
 870                         lower = THERMAL_NO_LIMIT;
 871                         if (limits) {
 872                                 lower = limits[i * 2];
 873                                 upper = limits[i * 2 + 1];
 874                         }
 875                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 876                                                                upper, lower,
 877                                                                weight);
 878                         if (ret)
 879                                 print_bind_err_msg(tz, cdev, ret);
 880                 }
 881         }
 882 }
 883
 884 static void bind_cdev(struct thermal_cooling_device *cdev)
 885 {
 886         int i, ret;
 887         const struct thermal_zone_params *tzp;
 888         struct thermal_zone_device *pos = NULL;
 889
 890         mutex_lock(&thermal_list_lock);
 891
 892         list_for_each_entry(pos, &thermal_tz_list, node) {
 893                 if (!pos->tzp && !pos->ops->bind)
 894                         continue;
 895
 896                 if (pos->ops->bind) {
 897                         ret = pos->ops->bind(pos, cdev);
 898                         if (ret)
 899                                 print_bind_err_msg(pos, cdev, ret);
 900                         continue;
 901                 }
 902
 903                 tzp = pos->tzp;
 904                 if (!tzp || !tzp->tbp)
 905                         continue;
 906
 907                 for (i = 0; i < tzp->num_tbps; i++) {
 908                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 909                                 continue;
 910                         if (tzp->tbp[i].match(pos, cdev))
 911                                 continue;
 912                         tzp->tbp[i].cdev = cdev;
 913                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 914                                tzp->tbp[i].binding_limits,
 915                                tzp->tbp[i].weight);
 916                 }
 917         }
 918
 919         mutex_unlock(&thermal_list_lock);
 920 }
 921
 922 /**
 923  * __thermal_cooling_device_register() - register a new thermal cooling device
 924  * @np:         a pointer to a device tree node.
 925  * @type:       the thermal cooling device type.
 926  * @devdata:    device private data.
 927  * @ops:                standard thermal cooling devices callbacks.
 928  *
 929  * This interface function adds a new thermal cooling device (fan/processor/...)
 930  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
 931  * to all the thermal zone devices registered at the same time.
 932  * It also gives the opportunity to link the cooling device to a device tree
 933  * node, so that it can be bound to a thermal zone created out of device tree.
 934  *
 935  * Return: a pointer to the created struct thermal_cooling_device or an
 936  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
 937  */
 938 static struct thermal_cooling_device *
 939 __thermal_cooling_device_register(struct device_node *np,
 940                                   char *type, void *devdata,
 941                                   const struct thermal_cooling_device_ops *ops)
 942 {
 943         struct thermal_cooling_device *cdev;
 944         struct thermal_zone_device *pos = NULL;
 945         int result;
 946
 947         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
 948                 return ERR_PTR(-EINVAL);
 949
 950         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 951             !ops->set_cur_state)
 952                 return ERR_PTR(-EINVAL);
 953
 954         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 955         if (!cdev)
 956                 return ERR_PTR(-ENOMEM);
 957
 958         result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL);
 959         if (result < 0) {
 960                 kfree(cdev);
 961                 return ERR_PTR(result);
 962         }
 963
 964         cdev->id = result;
 965         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
 966         mutex_init(&cdev->lock);
 967         INIT_LIST_HEAD(&cdev->thermal_instances);
 968         cdev->np = np;
 969         cdev->ops = ops;
 970         cdev->updated = false;
 971         cdev->device.class = &thermal_class;
 972         cdev->devdata = devdata;
 973         thermal_cooling_device_setup_sysfs(cdev);
 974         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 975         result = device_register(&cdev->device);
 976         if (result) {
 977                 ida_simple_remove(&thermal_cdev_ida, cdev->id);
 978                 kfree(cdev);
 979                 return ERR_PTR(result);
 980         }
 981
 982         /* Add 'this' new cdev to the global cdev list */
 983         mutex_lock(&thermal_list_lock);
 984         list_add(&cdev->node, &thermal_cdev_list);
 985         mutex_unlock(&thermal_list_lock);
 986
 987         /* Update binding information for 'this' new cdev */
 988         bind_cdev(cdev);
 989
 990         mutex_lock(&thermal_list_lock);
 991         list_for_each_entry(pos, &thermal_tz_list, node)
 992                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
 993                         thermal_zone_device_update(pos,
 994                                                    THERMAL_EVENT_UNSPECIFIED);
 995         mutex_unlock(&thermal_list_lock);
 996
 997         return cdev;
 998 }
 999
1000 /**
1001  * thermal_cooling_device_register() - register a new thermal cooling device
1002  * @type:       the thermal cooling device type.
1003  * @devdata:    device private data.
1004  * @ops:                standard thermal cooling devices callbacks.
1005  *
1006  * This interface function adds a new thermal cooling device (fan/processor/...)
1007  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1008  * to all the thermal zone devices registered at the same time.
1009  *
1010  * Return: a pointer to the created struct thermal_cooling_device or an
1011  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1012  */
1013 struct thermal_cooling_device *
1014 thermal_cooling_device_register(char *type, void *devdata,
1015                                 const struct thermal_cooling_device_ops *ops)
1016 {
1017         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1018 }
1019 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1020
1021 /**
1022  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1023  * @np:         a pointer to a device tree node.
1024  * @type:       the thermal cooling device type.
1025  * @devdata:    device private data.
1026  * @ops:                standard thermal cooling devices callbacks.
1027  *
1028  * This function will register a cooling device with device tree node reference.
1029  * This interface function adds a new thermal cooling device (fan/processor/...)
1030  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1031  * to all the thermal zone devices registered at the same time.
1032  *
1033  * Return: a pointer to the created struct thermal_cooling_device or an
1034  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1035  */
1036 struct thermal_cooling_device *
1037 thermal_of_cooling_device_register(struct device_node *np,
1038                                    char *type, void *devdata,
1039                                    const struct thermal_cooling_device_ops *ops)
1040 {
1041         return __thermal_cooling_device_register(np, type, devdata, ops);
1042 }
1043 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1044
1045 static void __unbind(struct thermal_zone_device *tz, int mask,
1046                      struct thermal_cooling_device *cdev)
1047 {
1048         int i;
1049
1050         for (i = 0; i < tz->trips; i++)
1051                 if (mask & (1 << i))
1052                         thermal_zone_unbind_cooling_device(tz, i, cdev);
1053 }
1054
1055 /**
1056  * thermal_cooling_device_unregister - removes a thermal cooling device
1057  * @cdev:       the thermal cooling device to remove.
1058  *
1059  * thermal_cooling_device_unregister() must be called when a registered
1060  * thermal cooling device is no longer needed.
1061  */
1062 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1063 {
1064         int i;
1065         const struct thermal_zone_params *tzp;
1066         struct thermal_zone_device *tz;
1067         struct thermal_cooling_device *pos = NULL;
1068
1069         if (!cdev)
1070                 return;
1071
1072         mutex_lock(&thermal_list_lock);
1073         list_for_each_entry(pos, &thermal_cdev_list, node)
1074                 if (pos == cdev)
1075                         break;
1076         if (pos != cdev) {
1077                 /* thermal cooling device not found */
1078                 mutex_unlock(&thermal_list_lock);
1079                 return;
1080         }
1081         list_del(&cdev->node);
1082
1083         /* Unbind all thermal zones associated with 'this' cdev */
1084         list_for_each_entry(tz, &thermal_tz_list, node) {
1085                 if (tz->ops->unbind) {
1086                         tz->ops->unbind(tz, cdev);
1087                         continue;
1088                 }
1089
1090                 if (!tz->tzp || !tz->tzp->tbp)
1091                         continue;
1092
1093                 tzp = tz->tzp;
1094                 for (i = 0; i < tzp->num_tbps; i++) {
1095                         if (tzp->tbp[i].cdev == cdev) {
1096                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1097                                 tzp->tbp[i].cdev = NULL;
1098                         }
1099                 }
1100         }
1101
1102         mutex_unlock(&thermal_list_lock);
1103
1104         ida_simple_remove(&thermal_cdev_ida, cdev->id);
1105         device_unregister(&cdev->device);
1106         thermal_cooling_device_destroy_sysfs(cdev);
1107 }
1108 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1109
1110 static void bind_tz(struct thermal_zone_device *tz)
1111 {
1112         int i, ret;
1113         struct thermal_cooling_device *pos = NULL;
1114         const struct thermal_zone_params *tzp = tz->tzp;
1115
1116         if (!tzp && !tz->ops->bind)
1117                 return;
1118
1119         mutex_lock(&thermal_list_lock);
1120
1121         /* If there is ops->bind, try to use ops->bind */
1122         if (tz->ops->bind) {
1123                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1124                         ret = tz->ops->bind(tz, pos);
1125                         if (ret)
1126                                 print_bind_err_msg(tz, pos, ret);
1127                 }
1128                 goto exit;
1129         }
1130
1131         if (!tzp || !tzp->tbp)
1132                 goto exit;
1133
1134         list_for_each_entry(pos, &thermal_cdev_list, node) {
1135                 for (i = 0; i < tzp->num_tbps; i++) {
1136                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
1137                                 continue;
1138                         if (tzp->tbp[i].match(tz, pos))
1139                                 continue;
1140                         tzp->tbp[i].cdev = pos;
1141                         __bind(tz, tzp->tbp[i].trip_mask, pos,
1142                                tzp->tbp[i].binding_limits,
1143                                tzp->tbp[i].weight);
1144                 }
1145         }
1146 exit:
1147         mutex_unlock(&thermal_list_lock);
1148 }
1149
1150 /**
1151  * thermal_zone_device_register() - register a new thermal zone device
1152  * @type:       the thermal zone device type
1153  * @trips:      the number of trip points the thermal zone support
1154  * @mask:       a bit string indicating the writeablility of trip points
1155  * @devdata:    private device data
1156  * @ops:        standard thermal zone device callbacks
1157  * @tzp:        thermal zone platform parameters
1158  * @passive_delay: number of milliseconds to wait between polls when
1159  *                 performing passive cooling
1160  * @polling_delay: number of milliseconds to wait between polls when checking
1161  *                 whether trip points have been crossed (0 for interrupt
1162  *                 driven systems)
1163  *
1164  * This interface function adds a new thermal zone device (sensor) to
1165  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1166  * thermal cooling devices registered at the same time.
1167  * thermal_zone_device_unregister() must be called when the device is no
1168  * longer needed. The passive cooling depends on the .get_trend() return value.
1169  *
1170  * Return: a pointer to the created struct thermal_zone_device or an
1171  * in case of error, an ERR_PTR. Caller must check return value with
1172  * IS_ERR*() helpers.
1173  */
1174 struct thermal_zone_device *
1175 thermal_zone_device_register(const char *type, int trips, int mask,
1176                              void *devdata, struct thermal_zone_device_ops *ops,
1177                              struct thermal_zone_params *tzp, int passive_delay,
1178                              int polling_delay)
1179 {
1180         struct thermal_zone_device *tz;
1181         enum thermal_trip_type trip_type;
1182         int trip_temp;
1183         int result;
1184         int count;
1185         struct thermal_governor *governor;
1186
1187         if (!type || strlen(type) == 0)
1188                 return ERR_PTR(-EINVAL);
1189
1190         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1191                 return ERR_PTR(-EINVAL);
1192
1193         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1194                 return ERR_PTR(-EINVAL);
1195
1196         if (!ops)
1197                 return ERR_PTR(-EINVAL);
1198
1199         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1200                 return ERR_PTR(-EINVAL);
1201
1202         tz = kzalloc(sizeof(*tz), GFP_KERNEL);
1203         if (!tz)
1204                 return ERR_PTR(-ENOMEM);
1205
1206         INIT_LIST_HEAD(&tz->thermal_instances);
1207         ida_init(&tz->ida);
1208         mutex_init(&tz->lock);
1209         result = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL);
1210         if (result < 0)
1211                 goto free_tz;
1212
1213         tz->id = result;
1214         strlcpy(tz->type, type, sizeof(tz->type));
1215         tz->ops = ops;
1216         tz->tzp = tzp;
1217         tz->device.class = &thermal_class;
1218         tz->devdata = devdata;
1219         tz->trips = trips;
1220         tz->passive_delay = passive_delay;
1221         tz->polling_delay = polling_delay;
1222
1223         /* sys I/F */
1224         /* Add nodes that are always present via .groups */
1225         result = thermal_zone_create_device_groups(tz, mask);
1226         if (result)
1227                 goto remove_id;
1228
1229         /* A new thermal zone needs to be updated anyway. */
1230         atomic_set(&tz->need_update, 1);
1231
1232         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1233         result = device_register(&tz->device);
1234         if (result)
1235                 goto remove_device_groups;
1236
1237         for (count = 0; count < trips; count++) {
1238                 if (tz->ops->get_trip_type(tz, count, &trip_type))
1239                         set_bit(count, &tz->trips_disabled);
1240                 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1241                         set_bit(count, &tz->trips_disabled);
1242                 /* Check for bogus trip points */
1243                 if (trip_temp == 0)
1244                         set_bit(count, &tz->trips_disabled);
1245         }
1246
1247         /* Update 'this' zone's governor information */
1248         mutex_lock(&thermal_governor_lock);
1249
1250         if (tz->tzp)
1251                 governor = __find_governor(tz->tzp->governor_name);
1252         else
1253                 governor = def_governor;
1254
1255         result = thermal_set_governor(tz, governor);
1256         if (result) {
1257                 mutex_unlock(&thermal_governor_lock);
1258                 goto unregister;
1259         }
1260
1261         mutex_unlock(&thermal_governor_lock);
1262
1263         if (!tz->tzp || !tz->tzp->no_hwmon) {
1264                 result = thermal_add_hwmon_sysfs(tz);
1265                 if (result)
1266                         goto unregister;
1267         }
1268
1269         mutex_lock(&thermal_list_lock);
1270         list_add_tail(&tz->node, &thermal_tz_list);
1271         mutex_unlock(&thermal_list_lock);
1272
1273         /* Bind cooling devices for this zone */
1274         bind_tz(tz);
1275
1276         INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check);
1277
1278         thermal_zone_device_reset(tz);
1279         /* Update the new thermal zone and mark it as already updated. */
1280         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1281                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
1282
1283         return tz;
1284
1285 unregister:
1286         ida_simple_remove(&thermal_tz_ida, tz->id);
1287         device_unregister(&tz->device);
1288         return ERR_PTR(result);
1289
1290 remove_device_groups:
1291         thermal_zone_destroy_device_groups(tz);
1292 remove_id:
1293         ida_simple_remove(&thermal_tz_ida, tz->id);
1294 free_tz:
1295         kfree(tz);
1296         return ERR_PTR(result);
1297 }
1298 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1299
1300 /**
1301  * thermal_device_unregister - removes the registered thermal zone device
1302  * @tz: the thermal zone device to remove
1303  */
1304 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1305 {
1306         int i;
1307         const struct thermal_zone_params *tzp;
1308         struct thermal_cooling_device *cdev;
1309         struct thermal_zone_device *pos = NULL;
1310
1311         if (!tz)
1312                 return;
1313
1314         tzp = tz->tzp;
1315
1316         mutex_lock(&thermal_list_lock);
1317         list_for_each_entry(pos, &thermal_tz_list, node)
1318                 if (pos == tz)
1319                         break;
1320         if (pos != tz) {
1321                 /* thermal zone device not found */
1322                 mutex_unlock(&thermal_list_lock);
1323                 return;
1324         }
1325         list_del(&tz->node);
1326
1327         /* Unbind all cdevs associated with 'this' thermal zone */
1328         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1329                 if (tz->ops->unbind) {
1330                         tz->ops->unbind(tz, cdev);
1331                         continue;
1332                 }
1333
1334                 if (!tzp || !tzp->tbp)
1335                         break;
1336
1337                 for (i = 0; i < tzp->num_tbps; i++) {
1338                         if (tzp->tbp[i].cdev == cdev) {
1339                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1340                                 tzp->tbp[i].cdev = NULL;
1341                         }
1342                 }
1343         }
1344
1345         mutex_unlock(&thermal_list_lock);
1346
1347         thermal_zone_device_set_polling(tz, 0);
1348
1349         thermal_set_governor(tz, NULL);
1350
1351         thermal_remove_hwmon_sysfs(tz);
1352         ida_simple_remove(&thermal_tz_ida, tz->id);
1353         ida_destroy(&tz->ida);
1354         mutex_destroy(&tz->lock);
1355         device_unregister(&tz->device);
1356 }
1357 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1358
1359 /**
1360  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1361  * @name: thermal zone name to fetch the temperature
1362  *
1363  * When only one zone is found with the passed name, returns a reference to it.
1364  *
1365  * Return: On success returns a reference to an unique thermal zone with
1366  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1367  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1368  */
1369 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1370 {
1371         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1372         unsigned int found = 0;
1373
1374         if (!name)
1375                 goto exit;
1376
1377         mutex_lock(&thermal_list_lock);
1378         list_for_each_entry(pos, &thermal_tz_list, node)
1379                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1380                         found++;
1381                         ref = pos;
1382                 }
1383         mutex_unlock(&thermal_list_lock);
1384
1385         /* nothing has been found, thus an error code for it */
1386         if (found == 0)
1387                 ref = ERR_PTR(-ENODEV);
1388         else if (found > 1)
1389         /* Success only when an unique zone is found */
1390                 ref = ERR_PTR(-EEXIST);
1391
1392 exit:
1393         return ref;
1394 }
1395 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1396
1397 #ifdef CONFIG_NET
1398 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1399         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1400 };
1401
1402 static struct genl_family thermal_event_genl_family __ro_after_init = {
1403         .module = THIS_MODULE,
1404         .name = THERMAL_GENL_FAMILY_NAME,
1405         .version = THERMAL_GENL_VERSION,
1406         .maxattr = THERMAL_GENL_ATTR_MAX,
1407         .mcgrps = thermal_event_mcgrps,
1408         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1409 };
1410
1411 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1412                                    enum events event)
1413 {
1414         struct sk_buff *skb;
1415         struct nlattr *attr;
1416         struct thermal_genl_event *thermal_event;
1417         void *msg_header;
1418         int size;
1419         int result;
1420         static unsigned int thermal_event_seqnum;
1421
1422         if (!tz)
1423                 return -EINVAL;
1424
1425         /* allocate memory */
1426         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1427                nla_total_size(0);
1428
1429         skb = genlmsg_new(size, GFP_ATOMIC);
1430         if (!skb)
1431                 return -ENOMEM;
1432
1433         /* add the genetlink message header */
1434         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1435                                  &thermal_event_genl_family, 0,
1436                                  THERMAL_GENL_CMD_EVENT);
1437         if (!msg_header) {
1438                 nlmsg_free(skb);
1439                 return -ENOMEM;
1440         }
1441
1442         /* fill the data */
1443         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1444                            sizeof(struct thermal_genl_event));
1445
1446         if (!attr) {
1447                 nlmsg_free(skb);
1448                 return -EINVAL;
1449         }
1450
1451         thermal_event = nla_data(attr);
1452         if (!thermal_event) {
1453                 nlmsg_free(skb);
1454                 return -EINVAL;
1455         }
1456
1457         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1458
1459         thermal_event->orig = tz->id;
1460         thermal_event->event = event;
1461
1462         /* send multicast genetlink message */
1463         genlmsg_end(skb, msg_header);
1464
1465         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1466                                    0, GFP_ATOMIC);
1467         if (result)
1468                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1469
1470         return result;
1471 }
1472 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1473
1474 static int __init genetlink_init(void)
1475 {
1476         return genl_register_family(&thermal_event_genl_family);
1477 }
1478
1479 static void genetlink_exit(void)
1480 {
1481         genl_unregister_family(&thermal_event_genl_family);
1482 }
1483 #else /* !CONFIG_NET */
1484 static inline int genetlink_init(void) { return 0; }
1485 static inline void genetlink_exit(void) {}
1486 #endif /* !CONFIG_NET */
1487
1488 static int thermal_pm_notify(struct notifier_block *nb,
1489                              unsigned long mode, void *_unused)
1490 {
1491         struct thermal_zone_device *tz;
1492
1493         switch (mode) {
1494         case PM_HIBERNATION_PREPARE:
1495         case PM_RESTORE_PREPARE:
1496         case PM_SUSPEND_PREPARE:
1497                 atomic_set(&in_suspend, 1);
1498                 break;
1499         case PM_POST_HIBERNATION:
1500         case PM_POST_RESTORE:
1501         case PM_POST_SUSPEND:
1502                 atomic_set(&in_suspend, 0);
1503                 list_for_each_entry(tz, &thermal_tz_list, node) {
1504                         thermal_zone_device_reset(tz);
1505                         thermal_zone_device_update(tz,
1506                                                    THERMAL_EVENT_UNSPECIFIED);
1507                 }
1508                 break;
1509         default:
1510                 break;
1511         }
1512         return 0;
1513 }
1514
1515 static struct notifier_block thermal_pm_nb = {
1516         .notifier_call = thermal_pm_notify,
1517 };
1518
1519 static int __init thermal_init(void)
1520 {
1521         int result;
1522
1523         mutex_init(&poweroff_lock);
1524         result = thermal_register_governors();
1525         if (result)
1526                 goto error;
1527
1528         result = class_register(&thermal_class);
1529         if (result)
1530                 goto unregister_governors;
1531
1532         result = genetlink_init();
1533         if (result)
1534                 goto unregister_class;
1535
1536         result = of_parse_thermal_zones();
1537         if (result)
1538                 goto exit_netlink;
1539
1540         result = register_pm_notifier(&thermal_pm_nb);
1541         if (result)
1542                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
1543                         result);
1544
1545         return 0;
1546
1547 exit_netlink:
1548         genetlink_exit();
1549 unregister_class:
1550         class_unregister(&thermal_class);
1551 unregister_governors:
1552         thermal_unregister_governors();
1553 error:
1554         ida_destroy(&thermal_tz_ida);
1555         ida_destroy(&thermal_cdev_ida);
1556         mutex_destroy(&thermal_list_lock);
1557         mutex_destroy(&thermal_governor_lock);
1558         mutex_destroy(&poweroff_lock);
1559         return result;
1560 }
1561
1562 static void __exit thermal_exit(void)
1563 {
1564         unregister_pm_notifier(&thermal_pm_nb);
1565         of_thermal_destroy_zones();
1566         genetlink_exit();
1567         class_unregister(&thermal_class);
1568         thermal_unregister_governors();
1569         ida_destroy(&thermal_tz_ida);
1570         ida_destroy(&thermal_cdev_ida);
1571         mutex_destroy(&thermal_list_lock);
1572         mutex_destroy(&thermal_governor_lock);
1573 }
1574
1575 fs_initcall(thermal_init);
1576 module_exit(thermal_exit);