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/device.h>
  13 #include <linux/err.h>
  14 #include <linux/export.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 <linux/suspend.h>
  23
  24 #define CREATE_TRACE_POINTS
  25 #include "thermal_trace.h"
  26
  27 #include "thermal_core.h"
  28 #include "thermal_hwmon.h"
  29
  30 static DEFINE_IDA(thermal_tz_ida);
  31 static DEFINE_IDA(thermal_cdev_ida);
  32
  33 static LIST_HEAD(thermal_tz_list);
  34 static LIST_HEAD(thermal_cdev_list);
  35 static LIST_HEAD(thermal_governor_list);
  36
  37 static DEFINE_MUTEX(thermal_list_lock);
  38 static DEFINE_MUTEX(thermal_governor_lock);
  39
  40 static struct thermal_governor *def_governor;
  41
  42 /*
  43  * Governor section: set of functions to handle thermal governors
  44  *
  45  * Functions to help in the life cycle of thermal governors within
  46  * the thermal core and by the thermal governor code.
  47  */
  48
  49 static struct thermal_governor *__find_governor(const char *name)
  50 {
  51         struct thermal_governor *pos;
  52
  53         if (!name || !name[0])
  54                 return def_governor;
  55
  56         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  57                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  58                         return pos;
  59
  60         return NULL;
  61 }
  62
  63 /**
  64  * bind_previous_governor() - bind the previous governor of the thermal zone
  65  * @tz:         a valid pointer to a struct thermal_zone_device
  66  * @failed_gov_name:    the name of the governor that failed to register
  67  *
  68  * Register the previous governor of the thermal zone after a new
  69  * governor has failed to be bound.
  70  */
  71 static void bind_previous_governor(struct thermal_zone_device *tz,
  72                                    const char *failed_gov_name)
  73 {
  74         if (tz->governor && tz->governor->bind_to_tz) {
  75                 if (tz->governor->bind_to_tz(tz)) {
  76                         dev_err(&tz->device,
  77                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  78                                 failed_gov_name, tz->governor->name, tz->type);
  79                         tz->governor = NULL;
  80                 }
  81         }
  82 }
  83
  84 /**
  85  * thermal_set_governor() - Switch to another governor
  86  * @tz:         a valid pointer to a struct thermal_zone_device
  87  * @new_gov:    pointer to the new governor
  88  *
  89  * Change the governor of thermal zone @tz.
  90  *
  91  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
  92  */
  93 static int thermal_set_governor(struct thermal_zone_device *tz,
  94                                 struct thermal_governor *new_gov)
  95 {
  96         int ret = 0;
  97
  98         if (tz->governor && tz->governor->unbind_from_tz)
  99                 tz->governor->unbind_from_tz(tz);
 100
 101         if (new_gov && new_gov->bind_to_tz) {
 102                 ret = new_gov->bind_to_tz(tz);
 103                 if (ret) {
 104                         bind_previous_governor(tz, new_gov->name);
 105
 106                         return ret;
 107                 }
 108         }
 109
 110         tz->governor = new_gov;
 111
 112         return ret;
 113 }
 114
 115 int thermal_register_governor(struct thermal_governor *governor)
 116 {
 117         int err;
 118         const char *name;
 119         struct thermal_zone_device *pos;
 120
 121         if (!governor)
 122                 return -EINVAL;
 123
 124         mutex_lock(&thermal_governor_lock);
 125
 126         err = -EBUSY;
 127         if (!__find_governor(governor->name)) {
 128                 bool match_default;
 129
 130                 err = 0;
 131                 list_add(&governor->governor_list, &thermal_governor_list);
 132                 match_default = !strncmp(governor->name,
 133                                          DEFAULT_THERMAL_GOVERNOR,
 134                                          THERMAL_NAME_LENGTH);
 135
 136                 if (!def_governor && match_default)
 137                         def_governor = governor;
 138         }
 139
 140         mutex_lock(&thermal_list_lock);
 141
 142         list_for_each_entry(pos, &thermal_tz_list, node) {
 143                 /*
 144                  * only thermal zones with specified tz->tzp->governor_name
 145                  * may run with tz->govenor unset
 146                  */
 147                 if (pos->governor)
 148                         continue;
 149
 150                 name = pos->tzp->governor_name;
 151
 152                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 153                         int ret;
 154
 155                         ret = thermal_set_governor(pos, governor);
 156                         if (ret)
 157                                 dev_err(&pos->device,
 158                                         "Failed to set governor %s for thermal zone %s: %d\n",
 159                                         governor->name, pos->type, ret);
 160                 }
 161         }
 162
 163         mutex_unlock(&thermal_list_lock);
 164         mutex_unlock(&thermal_governor_lock);
 165
 166         return err;
 167 }
 168
 169 void thermal_unregister_governor(struct thermal_governor *governor)
 170 {
 171         struct thermal_zone_device *pos;
 172
 173         if (!governor)
 174                 return;
 175
 176         mutex_lock(&thermal_governor_lock);
 177
 178         if (!__find_governor(governor->name))
 179                 goto exit;
 180
 181         mutex_lock(&thermal_list_lock);
 182
 183         list_for_each_entry(pos, &thermal_tz_list, node) {
 184                 if (!strncasecmp(pos->governor->name, governor->name,
 185                                  THERMAL_NAME_LENGTH))
 186                         thermal_set_governor(pos, NULL);
 187         }
 188
 189         mutex_unlock(&thermal_list_lock);
 190         list_del(&governor->governor_list);
 191 exit:
 192         mutex_unlock(&thermal_governor_lock);
 193 }
 194
 195 int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
 196                                    char *policy)
 197 {
 198         struct thermal_governor *gov;
 199         int ret = -EINVAL;
 200
 201         mutex_lock(&thermal_governor_lock);
 202         mutex_lock(&tz->lock);
 203
 204         gov = __find_governor(strim(policy));
 205         if (!gov)
 206                 goto exit;
 207
 208         ret = thermal_set_governor(tz, gov);
 209
 210 exit:
 211         mutex_unlock(&tz->lock);
 212         mutex_unlock(&thermal_governor_lock);
 213
 214         thermal_notify_tz_gov_change(tz, policy);
 215
 216         return ret;
 217 }
 218
 219 int thermal_build_list_of_policies(char *buf)
 220 {
 221         struct thermal_governor *pos;
 222         ssize_t count = 0;
 223
 224         mutex_lock(&thermal_governor_lock);
 225
 226         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 227                 count += sysfs_emit_at(buf, count, "%s ", pos->name);
 228         }
 229         count += sysfs_emit_at(buf, count, "\n");
 230
 231         mutex_unlock(&thermal_governor_lock);
 232
 233         return count;
 234 }
 235
 236 static void __init thermal_unregister_governors(void)
 237 {
 238         struct thermal_governor **governor;
 239
 240         for_each_governor_table(governor)
 241                 thermal_unregister_governor(*governor);
 242 }
 243
 244 static int __init thermal_register_governors(void)
 245 {
 246         int ret = 0;
 247         struct thermal_governor **governor;
 248
 249         for_each_governor_table(governor) {
 250                 ret = thermal_register_governor(*governor);
 251                 if (ret) {
 252                         pr_err("Failed to register governor: '%s'",
 253                                (*governor)->name);
 254                         break;
 255                 }
 256
 257                 pr_info("Registered thermal governor '%s'",
 258                         (*governor)->name);
 259         }
 260
 261         if (ret) {
 262                 struct thermal_governor **gov;
 263
 264                 for_each_governor_table(gov) {
 265                         if (gov == governor)
 266                                 break;
 267                         thermal_unregister_governor(*gov);
 268                 }
 269         }
 270
 271         return ret;
 272 }
 273
 274 /*
 275  * Zone update section: main control loop applied to each zone while monitoring
 276  * in polling mode. The monitoring is done using a workqueue.
 277  * Same update may be done on a zone by calling thermal_zone_device_update().
 278  *
 279  * An update means:
 280  * - Non-critical trips will invoke the governor responsible for that zone;
 281  * - Hot trips will produce a notification to userspace;
 282  * - Critical trip point will cause a system shutdown.
 283  */
 284 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 285                                             unsigned long delay)
 286 {
 287         if (delay)
 288                 mod_delayed_work(system_freezable_power_efficient_wq,
 289                                  &tz->poll_queue, delay);
 290         else
 291                 cancel_delayed_work(&tz->poll_queue);
 292 }
 293
 294 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 295 {
 296         if (tz->mode != THERMAL_DEVICE_ENABLED)
 297                 thermal_zone_device_set_polling(tz, 0);
 298         else if (tz->passive)
 299                 thermal_zone_device_set_polling(tz, tz->passive_delay_jiffies);
 300         else if (tz->polling_delay_jiffies)
 301                 thermal_zone_device_set_polling(tz, tz->polling_delay_jiffies);
 302 }
 303
 304 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 305                                       const struct thermal_trip *trip)
 306 {
 307         tz->governor ? tz->governor->throttle(tz, trip) :
 308                        def_governor->throttle(tz, trip);
 309 }
 310
 311 void thermal_governor_update_tz(struct thermal_zone_device *tz,
 312                                 enum thermal_notify_event reason)
 313 {
 314         if (!tz->governor || !tz->governor->update_tz)
 315                 return;
 316
 317         tz->governor->update_tz(tz, reason);
 318 }
 319
 320 static void thermal_zone_device_halt(struct thermal_zone_device *tz, bool shutdown)
 321 {
 322         /*
 323          * poweroff_delay_ms must be a carefully profiled positive value.
 324          * Its a must for forced_emergency_poweroff_work to be scheduled.
 325          */
 326         int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS;
 327         const char *msg = "Temperature too high";
 328
 329         dev_emerg(&tz->device, "%s: critical temperature reached\n", tz->type);
 330
 331         if (shutdown)
 332                 hw_protection_shutdown(msg, poweroff_delay_ms);
 333         else
 334                 hw_protection_reboot(msg, poweroff_delay_ms);
 335 }
 336
 337 void thermal_zone_device_critical(struct thermal_zone_device *tz)
 338 {
 339         thermal_zone_device_halt(tz, true);
 340 }
 341 EXPORT_SYMBOL(thermal_zone_device_critical);
 342
 343 void thermal_zone_device_critical_reboot(struct thermal_zone_device *tz)
 344 {
 345         thermal_zone_device_halt(tz, false);
 346 }
 347
 348 static void handle_critical_trips(struct thermal_zone_device *tz,
 349                                   const struct thermal_trip *trip)
 350 {
 351         /* If we have not crossed the trip_temp, we do not care. */
 352         if (trip->temperature <= 0 || tz->temperature < trip->temperature)
 353                 return;
 354
 355         trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, trip), trip->type);
 356
 357         if (trip->type == THERMAL_TRIP_CRITICAL)
 358                 tz->ops.critical(tz);
 359         else if (tz->ops.hot)
 360                 tz->ops.hot(tz);
 361 }
 362
 363 static void handle_thermal_trip(struct thermal_zone_device *tz,
 364                                 struct thermal_trip *trip)
 365 {
 366         if (trip->temperature == THERMAL_TEMP_INVALID)
 367                 return;
 368
 369         if (tz->last_temperature == THERMAL_TEMP_INVALID) {
 370                 /* Initialization. */
 371                 trip->threshold = trip->temperature;
 372                 if (tz->temperature >= trip->threshold)
 373                         trip->threshold -= trip->hysteresis;
 374         } else if (tz->last_temperature < trip->threshold) {
 375                 /*
 376                  * The trip threshold is equal to the trip temperature, unless
 377                  * the latter has changed in the meantime.  In either case,
 378                  * the trip is crossed if the current zone temperature is at
 379                  * least equal to its temperature, but otherwise ensure that
 380                  * the threshold and the trip temperature will be equal.
 381                  */
 382                 if (tz->temperature >= trip->temperature) {
 383                         thermal_notify_tz_trip_up(tz, trip);
 384                         thermal_debug_tz_trip_up(tz, trip);
 385                         trip->threshold = trip->temperature - trip->hysteresis;
 386                 } else {
 387                         trip->threshold = trip->temperature;
 388                 }
 389         } else {
 390                 /*
 391                  * The previous zone temperature was above or equal to the trip
 392                  * threshold, which would be equal to the "low temperature" of
 393                  * the trip (its temperature minus its hysteresis), unless the
 394                  * trip temperature or hysteresis had changed.  In either case,
 395                  * the trip is crossed if the current zone temperature is below
 396                  * the low temperature of the trip, but otherwise ensure that
 397                  * the trip threshold will be equal to the low temperature of
 398                  * the trip.
 399                  */
 400                 if (tz->temperature < trip->temperature - trip->hysteresis) {
 401                         thermal_notify_tz_trip_down(tz, trip);
 402                         thermal_debug_tz_trip_down(tz, trip);
 403                         trip->threshold = trip->temperature;
 404                 } else {
 405                         trip->threshold = trip->temperature - trip->hysteresis;
 406                 }
 407         }
 408
 409         if (trip->type == THERMAL_TRIP_CRITICAL || trip->type == THERMAL_TRIP_HOT)
 410                 handle_critical_trips(tz, trip);
 411         else
 412                 handle_non_critical_trips(tz, trip);
 413 }
 414
 415 static void update_temperature(struct thermal_zone_device *tz)
 416 {
 417         int temp, ret;
 418
 419         ret = __thermal_zone_get_temp(tz, &temp);
 420         if (ret) {
 421                 if (ret != -EAGAIN)
 422                         dev_warn(&tz->device,
 423                                  "failed to read out thermal zone (%d)\n",
 424                                  ret);
 425                 return;
 426         }
 427
 428         tz->last_temperature = tz->temperature;
 429         tz->temperature = temp;
 430
 431         trace_thermal_temperature(tz);
 432
 433         thermal_genl_sampling_temp(tz->id, temp);
 434         thermal_debug_update_temp(tz);
 435 }
 436
 437 static void thermal_zone_device_check(struct work_struct *work)
 438 {
 439         struct thermal_zone_device *tz = container_of(work, struct
 440                                                       thermal_zone_device,
 441                                                       poll_queue.work);
 442         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 443 }
 444
 445 static void thermal_zone_device_init(struct thermal_zone_device *tz)
 446 {
 447         struct thermal_instance *pos;
 448
 449         INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check);
 450
 451         tz->temperature = THERMAL_TEMP_INVALID;
 452         tz->prev_low_trip = -INT_MAX;
 453         tz->prev_high_trip = INT_MAX;
 454         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 455                 pos->initialized = false;
 456 }
 457
 458 void __thermal_zone_device_update(struct thermal_zone_device *tz,
 459                                   enum thermal_notify_event event)
 460 {
 461         struct thermal_trip *trip;
 462
 463         if (tz->suspended)
 464                 return;
 465
 466         if (!thermal_zone_device_is_enabled(tz))
 467                 return;
 468
 469         update_temperature(tz);
 470
 471         __thermal_zone_set_trips(tz);
 472
 473         tz->notify_event = event;
 474
 475         for_each_trip(tz, trip)
 476                 handle_thermal_trip(tz, trip);
 477
 478         monitor_thermal_zone(tz);
 479 }
 480
 481 static int thermal_zone_device_set_mode(struct thermal_zone_device *tz,
 482                                         enum thermal_device_mode mode)
 483 {
 484         int ret = 0;
 485
 486         mutex_lock(&tz->lock);
 487
 488         /* do nothing if mode isn't changing */
 489         if (mode == tz->mode) {
 490                 mutex_unlock(&tz->lock);
 491
 492                 return ret;
 493         }
 494
 495         if (tz->ops.change_mode)
 496                 ret = tz->ops.change_mode(tz, mode);
 497
 498         if (!ret)
 499                 tz->mode = mode;
 500
 501         __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 502
 503         mutex_unlock(&tz->lock);
 504
 505         if (mode == THERMAL_DEVICE_ENABLED)
 506                 thermal_notify_tz_enable(tz);
 507         else
 508                 thermal_notify_tz_disable(tz);
 509
 510         return ret;
 511 }
 512
 513 int thermal_zone_device_enable(struct thermal_zone_device *tz)
 514 {
 515         return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_ENABLED);
 516 }
 517 EXPORT_SYMBOL_GPL(thermal_zone_device_enable);
 518
 519 int thermal_zone_device_disable(struct thermal_zone_device *tz)
 520 {
 521         return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED);
 522 }
 523 EXPORT_SYMBOL_GPL(thermal_zone_device_disable);
 524
 525 int thermal_zone_device_is_enabled(struct thermal_zone_device *tz)
 526 {
 527         lockdep_assert_held(&tz->lock);
 528
 529         return tz->mode == THERMAL_DEVICE_ENABLED;
 530 }
 531
 532 static bool thermal_zone_is_present(struct thermal_zone_device *tz)
 533 {
 534         return !list_empty(&tz->node);
 535 }
 536
 537 void thermal_zone_device_update(struct thermal_zone_device *tz,
 538                                 enum thermal_notify_event event)
 539 {
 540         mutex_lock(&tz->lock);
 541         if (thermal_zone_is_present(tz))
 542                 __thermal_zone_device_update(tz, event);
 543         mutex_unlock(&tz->lock);
 544 }
 545 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 546
 547 int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
 548                               void *data)
 549 {
 550         struct thermal_governor *gov;
 551         int ret = 0;
 552
 553         mutex_lock(&thermal_governor_lock);
 554         list_for_each_entry(gov, &thermal_governor_list, governor_list) {
 555                 ret = cb(gov, data);
 556                 if (ret)
 557                         break;
 558         }
 559         mutex_unlock(&thermal_governor_lock);
 560
 561         return ret;
 562 }
 563
 564 int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
 565                                               void *), void *data)
 566 {
 567         struct thermal_cooling_device *cdev;
 568         int ret = 0;
 569
 570         mutex_lock(&thermal_list_lock);
 571         list_for_each_entry(cdev, &thermal_cdev_list, node) {
 572                 ret = cb(cdev, data);
 573                 if (ret)
 574                         break;
 575         }
 576         mutex_unlock(&thermal_list_lock);
 577
 578         return ret;
 579 }
 580
 581 int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
 582                           void *data)
 583 {
 584         struct thermal_zone_device *tz;
 585         int ret = 0;
 586
 587         mutex_lock(&thermal_list_lock);
 588         list_for_each_entry(tz, &thermal_tz_list, node) {
 589                 ret = cb(tz, data);
 590                 if (ret)
 591                         break;
 592         }
 593         mutex_unlock(&thermal_list_lock);
 594
 595         return ret;
 596 }
 597
 598 struct thermal_zone_device *thermal_zone_get_by_id(int id)
 599 {
 600         struct thermal_zone_device *tz, *match = NULL;
 601
 602         mutex_lock(&thermal_list_lock);
 603         list_for_each_entry(tz, &thermal_tz_list, node) {
 604                 if (tz->id == id) {
 605                         match = tz;
 606                         break;
 607                 }
 608         }
 609         mutex_unlock(&thermal_list_lock);
 610
 611         return match;
 612 }
 613
 614 /*
 615  * Device management section: cooling devices, zones devices, and binding
 616  *
 617  * Set of functions provided by the thermal core for:
 618  * - cooling devices lifecycle: registration, unregistration,
 619  *                              binding, and unbinding.
 620  * - thermal zone devices lifecycle: registration, unregistration,
 621  *                                   binding, and unbinding.
 622  */
 623
 624 /**
 625  * thermal_bind_cdev_to_trip - bind a cooling device to a thermal zone
 626  * @tz:         pointer to struct thermal_zone_device
 627  * @trip:       trip point the cooling devices is associated with in this zone.
 628  * @cdev:       pointer to struct thermal_cooling_device
 629  * @upper:      the Maximum cooling state for this trip point.
 630  *              THERMAL_NO_LIMIT means no upper limit,
 631  *              and the cooling device can be in max_state.
 632  * @lower:      the Minimum cooling state can be used for this trip point.
 633  *              THERMAL_NO_LIMIT means no lower limit,
 634  *              and the cooling device can be in cooling state 0.
 635  * @weight:     The weight of the cooling device to be bound to the
 636  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
 637  *              default value
 638  *
 639  * This interface function bind a thermal cooling device to the certain trip
 640  * point of a thermal zone device.
 641  * This function is usually called in the thermal zone device .bind callback.
 642  *
 643  * Return: 0 on success, the proper error value otherwise.
 644  */
 645 int thermal_bind_cdev_to_trip(struct thermal_zone_device *tz,
 646                                      const struct thermal_trip *trip,
 647                                      struct thermal_cooling_device *cdev,
 648                                      unsigned long upper, unsigned long lower,
 649                                      unsigned int weight)
 650 {
 651         struct thermal_instance *dev;
 652         struct thermal_instance *pos;
 653         struct thermal_zone_device *pos1;
 654         struct thermal_cooling_device *pos2;
 655         bool upper_no_limit;
 656         int result;
 657
 658         list_for_each_entry(pos1, &thermal_tz_list, node) {
 659                 if (pos1 == tz)
 660                         break;
 661         }
 662         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 663                 if (pos2 == cdev)
 664                         break;
 665         }
 666
 667         if (tz != pos1 || cdev != pos2)
 668                 return -EINVAL;
 669
 670         /* lower default 0, upper default max_state */
 671         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 672
 673         if (upper == THERMAL_NO_LIMIT) {
 674                 upper = cdev->max_state;
 675                 upper_no_limit = true;
 676         } else {
 677                 upper_no_limit = false;
 678         }
 679
 680         if (lower > upper || upper > cdev->max_state)
 681                 return -EINVAL;
 682
 683         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 684         if (!dev)
 685                 return -ENOMEM;
 686         dev->tz = tz;
 687         dev->cdev = cdev;
 688         dev->trip = trip;
 689         dev->upper = upper;
 690         dev->upper_no_limit = upper_no_limit;
 691         dev->lower = lower;
 692         dev->target = THERMAL_NO_TARGET;
 693         dev->weight = weight;
 694
 695         result = ida_alloc(&tz->ida, GFP_KERNEL);
 696         if (result < 0)
 697                 goto free_mem;
 698
 699         dev->id = result;
 700         sprintf(dev->name, "cdev%d", dev->id);
 701         result =
 702             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 703         if (result)
 704                 goto release_ida;
 705
 706         snprintf(dev->attr_name, sizeof(dev->attr_name), "cdev%d_trip_point",
 707                  dev->id);
 708         sysfs_attr_init(&dev->attr.attr);
 709         dev->attr.attr.name = dev->attr_name;
 710         dev->attr.attr.mode = 0444;
 711         dev->attr.show = trip_point_show;
 712         result = device_create_file(&tz->device, &dev->attr);
 713         if (result)
 714                 goto remove_symbol_link;
 715
 716         snprintf(dev->weight_attr_name, sizeof(dev->weight_attr_name),
 717                  "cdev%d_weight", dev->id);
 718         sysfs_attr_init(&dev->weight_attr.attr);
 719         dev->weight_attr.attr.name = dev->weight_attr_name;
 720         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
 721         dev->weight_attr.show = weight_show;
 722         dev->weight_attr.store = weight_store;
 723         result = device_create_file(&tz->device, &dev->weight_attr);
 724         if (result)
 725                 goto remove_trip_file;
 726
 727         mutex_lock(&tz->lock);
 728         mutex_lock(&cdev->lock);
 729         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 730                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 731                         result = -EEXIST;
 732                         break;
 733                 }
 734         if (!result) {
 735                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 736                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 737                 atomic_set(&tz->need_update, 1);
 738
 739                 thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV);
 740         }
 741         mutex_unlock(&cdev->lock);
 742         mutex_unlock(&tz->lock);
 743
 744         if (!result)
 745                 return 0;
 746
 747         device_remove_file(&tz->device, &dev->weight_attr);
 748 remove_trip_file:
 749         device_remove_file(&tz->device, &dev->attr);
 750 remove_symbol_link:
 751         sysfs_remove_link(&tz->device.kobj, dev->name);
 752 release_ida:
 753         ida_free(&tz->ida, dev->id);
 754 free_mem:
 755         kfree(dev);
 756         return result;
 757 }
 758 EXPORT_SYMBOL_GPL(thermal_bind_cdev_to_trip);
 759
 760 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 761                                      int trip_index,
 762                                      struct thermal_cooling_device *cdev,
 763                                      unsigned long upper, unsigned long lower,
 764                                      unsigned int weight)
 765 {
 766         if (trip_index < 0 || trip_index >= tz->num_trips)
 767                 return -EINVAL;
 768
 769         return thermal_bind_cdev_to_trip(tz, &tz->trips[trip_index], cdev,
 770                                          upper, lower, weight);
 771 }
 772 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
 773
 774 /**
 775  * thermal_unbind_cdev_from_trip - unbind a cooling device from a thermal zone.
 776  * @tz:         pointer to a struct thermal_zone_device.
 777  * @trip:       trip point the cooling devices is associated with in this zone.
 778  * @cdev:       pointer to a struct thermal_cooling_device.
 779  *
 780  * This interface function unbind a thermal cooling device from the certain
 781  * trip point of a thermal zone device.
 782  * This function is usually called in the thermal zone device .unbind callback.
 783  *
 784  * Return: 0 on success, the proper error value otherwise.
 785  */
 786 int thermal_unbind_cdev_from_trip(struct thermal_zone_device *tz,
 787                                   const struct thermal_trip *trip,
 788                                   struct thermal_cooling_device *cdev)
 789 {
 790         struct thermal_instance *pos, *next;
 791
 792         mutex_lock(&tz->lock);
 793         mutex_lock(&cdev->lock);
 794         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 795                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 796                         list_del(&pos->tz_node);
 797                         list_del(&pos->cdev_node);
 798
 799                         thermal_governor_update_tz(tz, THERMAL_TZ_UNBIND_CDEV);
 800
 801                         mutex_unlock(&cdev->lock);
 802                         mutex_unlock(&tz->lock);
 803                         goto unbind;
 804                 }
 805         }
 806         mutex_unlock(&cdev->lock);
 807         mutex_unlock(&tz->lock);
 808
 809         return -ENODEV;
 810
 811 unbind:
 812         device_remove_file(&tz->device, &pos->weight_attr);
 813         device_remove_file(&tz->device, &pos->attr);
 814         sysfs_remove_link(&tz->device.kobj, pos->name);
 815         ida_free(&tz->ida, pos->id);
 816         kfree(pos);
 817         return 0;
 818 }
 819 EXPORT_SYMBOL_GPL(thermal_unbind_cdev_from_trip);
 820
 821 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 822                                        int trip_index,
 823                                        struct thermal_cooling_device *cdev)
 824 {
 825         if (trip_index < 0 || trip_index >= tz->num_trips)
 826                 return -EINVAL;
 827
 828         return thermal_unbind_cdev_from_trip(tz, &tz->trips[trip_index], cdev);
 829 }
 830 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
 831
 832 static void thermal_release(struct device *dev)
 833 {
 834         struct thermal_zone_device *tz;
 835         struct thermal_cooling_device *cdev;
 836
 837         if (!strncmp(dev_name(dev), "thermal_zone",
 838                      sizeof("thermal_zone") - 1)) {
 839                 tz = to_thermal_zone(dev);
 840                 thermal_zone_destroy_device_groups(tz);
 841                 mutex_destroy(&tz->lock);
 842                 complete(&tz->removal);
 843         } else if (!strncmp(dev_name(dev), "cooling_device",
 844                             sizeof("cooling_device") - 1)) {
 845                 cdev = to_cooling_device(dev);
 846                 thermal_cooling_device_destroy_sysfs(cdev);
 847                 kfree_const(cdev->type);
 848                 ida_free(&thermal_cdev_ida, cdev->id);
 849                 kfree(cdev);
 850         }
 851 }
 852
 853 static struct class *thermal_class;
 854
 855 static inline
 856 void print_bind_err_msg(struct thermal_zone_device *tz,
 857                         struct thermal_cooling_device *cdev, int ret)
 858 {
 859         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 860                 tz->type, cdev->type, ret);
 861 }
 862
 863 static void bind_cdev(struct thermal_cooling_device *cdev)
 864 {
 865         int ret;
 866         struct thermal_zone_device *pos = NULL;
 867
 868         list_for_each_entry(pos, &thermal_tz_list, node) {
 869                 if (pos->ops.bind) {
 870                         ret = pos->ops.bind(pos, cdev);
 871                         if (ret)
 872                                 print_bind_err_msg(pos, cdev, ret);
 873                 }
 874         }
 875 }
 876
 877 /**
 878  * __thermal_cooling_device_register() - register a new thermal cooling device
 879  * @np:         a pointer to a device tree node.
 880  * @type:       the thermal cooling device type.
 881  * @devdata:    device private data.
 882  * @ops:                standard thermal cooling devices callbacks.
 883  *
 884  * This interface function adds a new thermal cooling device (fan/processor/...)
 885  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
 886  * to all the thermal zone devices registered at the same time.
 887  * It also gives the opportunity to link the cooling device to a device tree
 888  * node, so that it can be bound to a thermal zone created out of device tree.
 889  *
 890  * Return: a pointer to the created struct thermal_cooling_device or an
 891  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
 892  */
 893 static struct thermal_cooling_device *
 894 __thermal_cooling_device_register(struct device_node *np,
 895                                   const char *type, void *devdata,
 896                                   const struct thermal_cooling_device_ops *ops)
 897 {
 898         struct thermal_cooling_device *cdev;
 899         struct thermal_zone_device *pos = NULL;
 900         int id, ret;
 901
 902         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 903             !ops->set_cur_state)
 904                 return ERR_PTR(-EINVAL);
 905
 906         if (!thermal_class)
 907                 return ERR_PTR(-ENODEV);
 908
 909         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 910         if (!cdev)
 911                 return ERR_PTR(-ENOMEM);
 912
 913         ret = ida_alloc(&thermal_cdev_ida, GFP_KERNEL);
 914         if (ret < 0)
 915                 goto out_kfree_cdev;
 916         cdev->id = ret;
 917         id = ret;
 918
 919         cdev->type = kstrdup_const(type ? type : "", GFP_KERNEL);
 920         if (!cdev->type) {
 921                 ret = -ENOMEM;
 922                 goto out_ida_remove;
 923         }
 924
 925         mutex_init(&cdev->lock);
 926         INIT_LIST_HEAD(&cdev->thermal_instances);
 927         cdev->np = np;
 928         cdev->ops = ops;
 929         cdev->updated = false;
 930         cdev->device.class = thermal_class;
 931         cdev->devdata = devdata;
 932
 933         ret = cdev->ops->get_max_state(cdev, &cdev->max_state);
 934         if (ret)
 935                 goto out_cdev_type;
 936
 937         thermal_cooling_device_setup_sysfs(cdev);
 938
 939         ret = dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 940         if (ret)
 941                 goto out_cooling_dev;
 942
 943         ret = device_register(&cdev->device);
 944         if (ret) {
 945                 /* thermal_release() handles rest of the cleanup */
 946                 put_device(&cdev->device);
 947                 return ERR_PTR(ret);
 948         }
 949
 950         /* Add 'this' new cdev to the global cdev list */
 951         mutex_lock(&thermal_list_lock);
 952
 953         list_add(&cdev->node, &thermal_cdev_list);
 954
 955         /* Update binding information for 'this' new cdev */
 956         bind_cdev(cdev);
 957
 958         list_for_each_entry(pos, &thermal_tz_list, node)
 959                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
 960                         thermal_zone_device_update(pos,
 961                                                    THERMAL_EVENT_UNSPECIFIED);
 962
 963         mutex_unlock(&thermal_list_lock);
 964
 965         thermal_debug_cdev_add(cdev);
 966
 967         return cdev;
 968
 969 out_cooling_dev:
 970         thermal_cooling_device_destroy_sysfs(cdev);
 971 out_cdev_type:
 972         kfree_const(cdev->type);
 973 out_ida_remove:
 974         ida_free(&thermal_cdev_ida, id);
 975 out_kfree_cdev:
 976         kfree(cdev);
 977         return ERR_PTR(ret);
 978 }
 979
 980 /**
 981  * thermal_cooling_device_register() - register a new thermal cooling device
 982  * @type:       the thermal cooling device type.
 983  * @devdata:    device private data.
 984  * @ops:                standard thermal cooling devices callbacks.
 985  *
 986  * This interface function adds a new thermal cooling device (fan/processor/...)
 987  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
 988  * to all the thermal zone devices registered at the same time.
 989  *
 990  * Return: a pointer to the created struct thermal_cooling_device or an
 991  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
 992  */
 993 struct thermal_cooling_device *
 994 thermal_cooling_device_register(const char *type, void *devdata,
 995                                 const struct thermal_cooling_device_ops *ops)
 996 {
 997         return __thermal_cooling_device_register(NULL, type, devdata, ops);
 998 }
 999 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1000
1001 /**
1002  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1003  * @np:         a pointer to a device tree node.
1004  * @type:       the thermal cooling device type.
1005  * @devdata:    device private data.
1006  * @ops:                standard thermal cooling devices callbacks.
1007  *
1008  * This function will register a cooling device with device tree node reference.
1009  * This interface function adds a new thermal cooling device (fan/processor/...)
1010  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1011  * to all the thermal zone devices registered at the same time.
1012  *
1013  * Return: a pointer to the created struct thermal_cooling_device or an
1014  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1015  */
1016 struct thermal_cooling_device *
1017 thermal_of_cooling_device_register(struct device_node *np,
1018                                    const char *type, void *devdata,
1019                                    const struct thermal_cooling_device_ops *ops)
1020 {
1021         return __thermal_cooling_device_register(np, type, devdata, ops);
1022 }
1023 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1024
1025 static void thermal_cooling_device_release(struct device *dev, void *res)
1026 {
1027         thermal_cooling_device_unregister(
1028                                 *(struct thermal_cooling_device **)res);
1029 }
1030
1031 /**
1032  * devm_thermal_of_cooling_device_register() - register an OF thermal cooling
1033  *                                             device
1034  * @dev:        a valid struct device pointer of a sensor device.
1035  * @np:         a pointer to a device tree node.
1036  * @type:       the thermal cooling device type.
1037  * @devdata:    device private data.
1038  * @ops:        standard thermal cooling devices callbacks.
1039  *
1040  * This function will register a cooling device with device tree node reference.
1041  * This interface function adds a new thermal cooling device (fan/processor/...)
1042  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1043  * to all the thermal zone devices registered at the same time.
1044  *
1045  * Return: a pointer to the created struct thermal_cooling_device or an
1046  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1047  */
1048 struct thermal_cooling_device *
1049 devm_thermal_of_cooling_device_register(struct device *dev,
1050                                 struct device_node *np,
1051                                 char *type, void *devdata,
1052                                 const struct thermal_cooling_device_ops *ops)
1053 {
1054         struct thermal_cooling_device **ptr, *tcd;
1055
1056         ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr),
1057                            GFP_KERNEL);
1058         if (!ptr)
1059                 return ERR_PTR(-ENOMEM);
1060
1061         tcd = __thermal_cooling_device_register(np, type, devdata, ops);
1062         if (IS_ERR(tcd)) {
1063                 devres_free(ptr);
1064                 return tcd;
1065         }
1066
1067         *ptr = tcd;
1068         devres_add(dev, ptr);
1069
1070         return tcd;
1071 }
1072 EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);
1073
1074 static bool thermal_cooling_device_present(struct thermal_cooling_device *cdev)
1075 {
1076         struct thermal_cooling_device *pos = NULL;
1077
1078         list_for_each_entry(pos, &thermal_cdev_list, node) {
1079                 if (pos == cdev)
1080                         return true;
1081         }
1082
1083         return false;
1084 }
1085
1086 /**
1087  * thermal_cooling_device_update - Update a cooling device object
1088  * @cdev: Target cooling device.
1089  *
1090  * Update @cdev to reflect a change of the underlying hardware or platform.
1091  *
1092  * Must be called when the maximum cooling state of @cdev becomes invalid and so
1093  * its .get_max_state() callback needs to be run to produce the new maximum
1094  * cooling state value.
1095  */
1096 void thermal_cooling_device_update(struct thermal_cooling_device *cdev)
1097 {
1098         struct thermal_instance *ti;
1099         unsigned long state;
1100
1101         if (IS_ERR_OR_NULL(cdev))
1102                 return;
1103
1104         /*
1105          * Hold thermal_list_lock throughout the update to prevent the device
1106          * from going away while being updated.
1107          */
1108         mutex_lock(&thermal_list_lock);
1109
1110         if (!thermal_cooling_device_present(cdev))
1111                 goto unlock_list;
1112
1113         /*
1114          * Update under the cdev lock to prevent the state from being set beyond
1115          * the new limit concurrently.
1116          */
1117         mutex_lock(&cdev->lock);
1118
1119         if (cdev->ops->get_max_state(cdev, &cdev->max_state))
1120                 goto unlock;
1121
1122         thermal_cooling_device_stats_reinit(cdev);
1123
1124         list_for_each_entry(ti, &cdev->thermal_instances, cdev_node) {
1125                 if (ti->upper == cdev->max_state)
1126                         continue;
1127
1128                 if (ti->upper < cdev->max_state) {
1129                         if (ti->upper_no_limit)
1130                                 ti->upper = cdev->max_state;
1131
1132                         continue;
1133                 }
1134
1135                 ti->upper = cdev->max_state;
1136                 if (ti->lower > ti->upper)
1137                         ti->lower = ti->upper;
1138
1139                 if (ti->target == THERMAL_NO_TARGET)
1140                         continue;
1141
1142                 if (ti->target > ti->upper)
1143                         ti->target = ti->upper;
1144         }
1145
1146         if (cdev->ops->get_cur_state(cdev, &state) || state > cdev->max_state)
1147                 goto unlock;
1148
1149         thermal_cooling_device_stats_update(cdev, state);
1150
1151 unlock:
1152         mutex_unlock(&cdev->lock);
1153
1154 unlock_list:
1155         mutex_unlock(&thermal_list_lock);
1156 }
1157 EXPORT_SYMBOL_GPL(thermal_cooling_device_update);
1158
1159 /**
1160  * thermal_cooling_device_unregister - removes a thermal cooling device
1161  * @cdev:       the thermal cooling device to remove.
1162  *
1163  * thermal_cooling_device_unregister() must be called when a registered
1164  * thermal cooling device is no longer needed.
1165  */
1166 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1167 {
1168         struct thermal_zone_device *tz;
1169
1170         if (!cdev)
1171                 return;
1172
1173         thermal_debug_cdev_remove(cdev);
1174
1175         mutex_lock(&thermal_list_lock);
1176
1177         if (!thermal_cooling_device_present(cdev)) {
1178                 mutex_unlock(&thermal_list_lock);
1179                 return;
1180         }
1181
1182         list_del(&cdev->node);
1183
1184         /* Unbind all thermal zones associated with 'this' cdev */
1185         list_for_each_entry(tz, &thermal_tz_list, node) {
1186                 if (tz->ops.unbind)
1187                         tz->ops.unbind(tz, cdev);
1188         }
1189
1190         mutex_unlock(&thermal_list_lock);
1191
1192         device_unregister(&cdev->device);
1193 }
1194 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1195
1196 static void bind_tz(struct thermal_zone_device *tz)
1197 {
1198         int ret;
1199         struct thermal_cooling_device *pos = NULL;
1200
1201         if (!tz->ops.bind)
1202                 return;
1203
1204         mutex_lock(&thermal_list_lock);
1205
1206         list_for_each_entry(pos, &thermal_cdev_list, node) {
1207                 ret = tz->ops.bind(tz, pos);
1208                 if (ret)
1209                         print_bind_err_msg(tz, pos, ret);
1210         }
1211
1212         mutex_unlock(&thermal_list_lock);
1213 }
1214
1215 static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms)
1216 {
1217         *delay_jiffies = msecs_to_jiffies(delay_ms);
1218         if (delay_ms > 1000)
1219                 *delay_jiffies = round_jiffies(*delay_jiffies);
1220 }
1221
1222 int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp)
1223 {
1224         int i, ret = -EINVAL;
1225
1226         if (tz->ops.get_crit_temp)
1227                 return tz->ops.get_crit_temp(tz, temp);
1228
1229         mutex_lock(&tz->lock);
1230
1231         for (i = 0; i < tz->num_trips; i++) {
1232                 if (tz->trips[i].type == THERMAL_TRIP_CRITICAL) {
1233                         *temp = tz->trips[i].temperature;
1234                         ret = 0;
1235                         break;
1236                 }
1237         }
1238
1239         mutex_unlock(&tz->lock);
1240
1241         return ret;
1242 }
1243 EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp);
1244
1245 /**
1246  * thermal_zone_device_register_with_trips() - register a new thermal zone device
1247  * @type:       the thermal zone device type
1248  * @trips:      a pointer to an array of thermal trips
1249  * @num_trips:  the number of trip points the thermal zone support
1250  * @devdata:    private device data
1251  * @ops:        standard thermal zone device callbacks
1252  * @tzp:        thermal zone platform parameters
1253  * @passive_delay: number of milliseconds to wait between polls when
1254  *                 performing passive cooling
1255  * @polling_delay: number of milliseconds to wait between polls when checking
1256  *                 whether trip points have been crossed (0 for interrupt
1257  *                 driven systems)
1258  *
1259  * This interface function adds a new thermal zone device (sensor) to
1260  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1261  * thermal cooling devices registered at the same time.
1262  * thermal_zone_device_unregister() must be called when the device is no
1263  * longer needed. The passive cooling depends on the .get_trend() return value.
1264  *
1265  * Return: a pointer to the created struct thermal_zone_device or an
1266  * in case of error, an ERR_PTR. Caller must check return value with
1267  * IS_ERR*() helpers.
1268  */
1269 struct thermal_zone_device *
1270 thermal_zone_device_register_with_trips(const char *type,
1271                                         const struct thermal_trip *trips,
1272                                         int num_trips, void *devdata,
1273                                         const struct thermal_zone_device_ops *ops,
1274                                         const struct thermal_zone_params *tzp,
1275                                         int passive_delay, int polling_delay)
1276 {
1277         struct thermal_zone_device *tz;
1278         int id;
1279         int result;
1280         struct thermal_governor *governor;
1281
1282         if (!type || strlen(type) == 0) {
1283                 pr_err("No thermal zone type defined\n");
1284                 return ERR_PTR(-EINVAL);
1285         }
1286
1287         if (strlen(type) >= THERMAL_NAME_LENGTH) {
1288                 pr_err("Thermal zone name (%s) too long, should be under %d chars\n",
1289                        type, THERMAL_NAME_LENGTH);
1290                 return ERR_PTR(-EINVAL);
1291         }
1292
1293         if (num_trips < 0) {
1294                 pr_err("Incorrect number of thermal trips\n");
1295                 return ERR_PTR(-EINVAL);
1296         }
1297
1298         if (!ops || !ops->get_temp) {
1299                 pr_err("Thermal zone device ops not defined\n");
1300                 return ERR_PTR(-EINVAL);
1301         }
1302
1303         if (num_trips > 0 && !trips)
1304                 return ERR_PTR(-EINVAL);
1305
1306         if (!thermal_class)
1307                 return ERR_PTR(-ENODEV);
1308
1309         tz = kzalloc(struct_size(tz, trips, num_trips), GFP_KERNEL);
1310         if (!tz)
1311                 return ERR_PTR(-ENOMEM);
1312
1313         if (tzp) {
1314                 tz->tzp = kmemdup(tzp, sizeof(*tzp), GFP_KERNEL);
1315                 if (!tz->tzp) {
1316                         result = -ENOMEM;
1317                         goto free_tz;
1318                 }
1319         }
1320
1321         INIT_LIST_HEAD(&tz->thermal_instances);
1322         INIT_LIST_HEAD(&tz->node);
1323         ida_init(&tz->ida);
1324         mutex_init(&tz->lock);
1325         init_completion(&tz->removal);
1326         id = ida_alloc(&thermal_tz_ida, GFP_KERNEL);
1327         if (id < 0) {
1328                 result = id;
1329                 goto free_tzp;
1330         }
1331
1332         tz->id = id;
1333         strscpy(tz->type, type, sizeof(tz->type));
1334
1335         tz->ops = *ops;
1336         if (!tz->ops.critical)
1337                 tz->ops.critical = thermal_zone_device_critical;
1338
1339         tz->device.class = thermal_class;
1340         tz->devdata = devdata;
1341         tz->num_trips = num_trips;
1342         memcpy(tz->trips, trips, num_trips * sizeof(*trips));
1343
1344         thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
1345         thermal_set_delay_jiffies(&tz->polling_delay_jiffies, polling_delay);
1346
1347         /* sys I/F */
1348         /* Add nodes that are always present via .groups */
1349         result = thermal_zone_create_device_groups(tz);
1350         if (result)
1351                 goto remove_id;
1352
1353         /* A new thermal zone needs to be updated anyway. */
1354         atomic_set(&tz->need_update, 1);
1355
1356         result = dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1357         if (result) {
1358                 thermal_zone_destroy_device_groups(tz);
1359                 goto remove_id;
1360         }
1361         result = device_register(&tz->device);
1362         if (result)
1363                 goto release_device;
1364
1365         /* Update 'this' zone's governor information */
1366         mutex_lock(&thermal_governor_lock);
1367
1368         if (tz->tzp)
1369                 governor = __find_governor(tz->tzp->governor_name);
1370         else
1371                 governor = def_governor;
1372
1373         result = thermal_set_governor(tz, governor);
1374         if (result) {
1375                 mutex_unlock(&thermal_governor_lock);
1376                 goto unregister;
1377         }
1378
1379         mutex_unlock(&thermal_governor_lock);
1380
1381         if (!tz->tzp || !tz->tzp->no_hwmon) {
1382                 result = thermal_add_hwmon_sysfs(tz);
1383                 if (result)
1384                         goto unregister;
1385         }
1386
1387         mutex_lock(&thermal_list_lock);
1388         mutex_lock(&tz->lock);
1389         list_add_tail(&tz->node, &thermal_tz_list);
1390         mutex_unlock(&tz->lock);
1391         mutex_unlock(&thermal_list_lock);
1392
1393         /* Bind cooling devices for this zone */
1394         bind_tz(tz);
1395
1396         thermal_zone_device_init(tz);
1397         /* Update the new thermal zone and mark it as already updated. */
1398         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1399                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
1400
1401         thermal_notify_tz_create(tz);
1402
1403         thermal_debug_tz_add(tz);
1404
1405         return tz;
1406
1407 unregister:
1408         device_del(&tz->device);
1409 release_device:
1410         put_device(&tz->device);
1411 remove_id:
1412         ida_free(&thermal_tz_ida, id);
1413 free_tzp:
1414         kfree(tz->tzp);
1415 free_tz:
1416         kfree(tz);
1417         return ERR_PTR(result);
1418 }
1419 EXPORT_SYMBOL_GPL(thermal_zone_device_register_with_trips);
1420
1421 struct thermal_zone_device *thermal_tripless_zone_device_register(
1422                                         const char *type,
1423                                         void *devdata,
1424                                         const struct thermal_zone_device_ops *ops,
1425                                         const struct thermal_zone_params *tzp)
1426 {
1427         return thermal_zone_device_register_with_trips(type, NULL, 0, devdata,
1428                                                        ops, tzp, 0, 0);
1429 }
1430 EXPORT_SYMBOL_GPL(thermal_tripless_zone_device_register);
1431
1432 void *thermal_zone_device_priv(struct thermal_zone_device *tzd)
1433 {
1434         return tzd->devdata;
1435 }
1436 EXPORT_SYMBOL_GPL(thermal_zone_device_priv);
1437
1438 const char *thermal_zone_device_type(struct thermal_zone_device *tzd)
1439 {
1440         return tzd->type;
1441 }
1442 EXPORT_SYMBOL_GPL(thermal_zone_device_type);
1443
1444 int thermal_zone_device_id(struct thermal_zone_device *tzd)
1445 {
1446         return tzd->id;
1447 }
1448 EXPORT_SYMBOL_GPL(thermal_zone_device_id);
1449
1450 struct device *thermal_zone_device(struct thermal_zone_device *tzd)
1451 {
1452         return &tzd->device;
1453 }
1454 EXPORT_SYMBOL_GPL(thermal_zone_device);
1455
1456 /**
1457  * thermal_zone_device_unregister - removes the registered thermal zone device
1458  * @tz: the thermal zone device to remove
1459  */
1460 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1461 {
1462         struct thermal_cooling_device *cdev;
1463         struct thermal_zone_device *pos = NULL;
1464
1465         if (!tz)
1466                 return;
1467
1468         thermal_debug_tz_remove(tz);
1469
1470         mutex_lock(&thermal_list_lock);
1471         list_for_each_entry(pos, &thermal_tz_list, node)
1472                 if (pos == tz)
1473                         break;
1474         if (pos != tz) {
1475                 /* thermal zone device not found */
1476                 mutex_unlock(&thermal_list_lock);
1477                 return;
1478         }
1479
1480         mutex_lock(&tz->lock);
1481         list_del(&tz->node);
1482         mutex_unlock(&tz->lock);
1483
1484         /* Unbind all cdevs associated with 'this' thermal zone */
1485         list_for_each_entry(cdev, &thermal_cdev_list, node)
1486                 if (tz->ops.unbind)
1487                         tz->ops.unbind(tz, cdev);
1488
1489         mutex_unlock(&thermal_list_lock);
1490
1491         cancel_delayed_work_sync(&tz->poll_queue);
1492
1493         thermal_set_governor(tz, NULL);
1494
1495         thermal_remove_hwmon_sysfs(tz);
1496         ida_free(&thermal_tz_ida, tz->id);
1497         ida_destroy(&tz->ida);
1498
1499         device_del(&tz->device);
1500
1501         kfree(tz->tzp);
1502
1503         put_device(&tz->device);
1504
1505         thermal_notify_tz_delete(tz);
1506
1507         wait_for_completion(&tz->removal);
1508         kfree(tz);
1509 }
1510 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1511
1512 /**
1513  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1514  * @name: thermal zone name to fetch the temperature
1515  *
1516  * When only one zone is found with the passed name, returns a reference to it.
1517  *
1518  * Return: On success returns a reference to an unique thermal zone with
1519  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1520  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1521  */
1522 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1523 {
1524         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1525         unsigned int found = 0;
1526
1527         if (!name)
1528                 goto exit;
1529
1530         mutex_lock(&thermal_list_lock);
1531         list_for_each_entry(pos, &thermal_tz_list, node)
1532                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1533                         found++;
1534                         ref = pos;
1535                 }
1536         mutex_unlock(&thermal_list_lock);
1537
1538         /* nothing has been found, thus an error code for it */
1539         if (found == 0)
1540                 ref = ERR_PTR(-ENODEV);
1541         else if (found > 1)
1542         /* Success only when an unique zone is found */
1543                 ref = ERR_PTR(-EEXIST);
1544
1545 exit:
1546         return ref;
1547 }
1548 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1549
1550 static void thermal_zone_device_resume(struct work_struct *work)
1551 {
1552         struct thermal_zone_device *tz;
1553
1554         tz = container_of(work, struct thermal_zone_device, poll_queue.work);
1555
1556         mutex_lock(&tz->lock);
1557
1558         tz->suspended = false;
1559
1560         thermal_zone_device_init(tz);
1561         __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
1562
1563         mutex_unlock(&tz->lock);
1564 }
1565
1566 static int thermal_pm_notify(struct notifier_block *nb,
1567                              unsigned long mode, void *_unused)
1568 {
1569         struct thermal_zone_device *tz;
1570
1571         switch (mode) {
1572         case PM_HIBERNATION_PREPARE:
1573         case PM_RESTORE_PREPARE:
1574         case PM_SUSPEND_PREPARE:
1575                 mutex_lock(&thermal_list_lock);
1576
1577                 list_for_each_entry(tz, &thermal_tz_list, node) {
1578                         mutex_lock(&tz->lock);
1579
1580                         tz->suspended = true;
1581
1582                         mutex_unlock(&tz->lock);
1583                 }
1584
1585                 mutex_unlock(&thermal_list_lock);
1586                 break;
1587         case PM_POST_HIBERNATION:
1588         case PM_POST_RESTORE:
1589         case PM_POST_SUSPEND:
1590                 mutex_lock(&thermal_list_lock);
1591
1592                 list_for_each_entry(tz, &thermal_tz_list, node) {
1593                         mutex_lock(&tz->lock);
1594
1595                         cancel_delayed_work(&tz->poll_queue);
1596
1597                         /*
1598                          * Replace the work function with the resume one, which
1599                          * will restore the original work function and schedule
1600                          * the polling work if needed.
1601                          */
1602                         INIT_DELAYED_WORK(&tz->poll_queue,
1603                                           thermal_zone_device_resume);
1604                         /* Queue up the work without a delay. */
1605                         mod_delayed_work(system_freezable_power_efficient_wq,
1606                                          &tz->poll_queue, 0);
1607
1608                         mutex_unlock(&tz->lock);
1609                 }
1610
1611                 mutex_unlock(&thermal_list_lock);
1612                 break;
1613         default:
1614                 break;
1615         }
1616         return 0;
1617 }
1618
1619 static struct notifier_block thermal_pm_nb = {
1620         .notifier_call = thermal_pm_notify,
1621 };
1622
1623 static int __init thermal_init(void)
1624 {
1625         int result;
1626
1627         thermal_debug_init();
1628
1629         result = thermal_netlink_init();
1630         if (result)
1631                 goto error;
1632
1633         result = thermal_register_governors();
1634         if (result)
1635                 goto unregister_netlink;
1636
1637         thermal_class = kzalloc(sizeof(*thermal_class), GFP_KERNEL);
1638         if (!thermal_class) {
1639                 result = -ENOMEM;
1640                 goto unregister_governors;
1641         }
1642
1643         thermal_class->name = "thermal";
1644         thermal_class->dev_release = thermal_release;
1645
1646         result = class_register(thermal_class);
1647         if (result) {
1648                 kfree(thermal_class);
1649                 thermal_class = NULL;
1650                 goto unregister_governors;
1651         }
1652
1653         result = register_pm_notifier(&thermal_pm_nb);
1654         if (result)
1655                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
1656                         result);
1657
1658         return 0;
1659
1660 unregister_governors:
1661         thermal_unregister_governors();
1662 unregister_netlink:
1663         thermal_netlink_exit();
1664 error:
1665         mutex_destroy(&thermal_list_lock);
1666         mutex_destroy(&thermal_governor_lock);
1667         return result;
1668 }
1669 postcore_initcall(thermal_init);