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