drivers/thermal/thermal_core.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/reboot.h>
  36 #include <linux/string.h>
  37 #include <linux/of.h>
  38 #include <net/netlink.h>
  39 #include <net/genetlink.h>
  40 #define CREATE_TRACE_POINTS
  41 #include <trace/events/thermal.h>
  42
  43 #include "thermal_core.h"
  44 #include "thermal_hwmon.h"
  45
  46 MODULE_AUTHOR("Zhang Rui");
  47 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  48 MODULE_LICENSE("GPL v2");
  49
  50 static DEFINE_IDR(thermal_tz_idr);
  51 static DEFINE_IDR(thermal_cdev_idr);
  52 static DEFINE_MUTEX(thermal_idr_lock);
  53
  54 static LIST_HEAD(thermal_tz_list);
  55 static LIST_HEAD(thermal_cdev_list);
  56 static LIST_HEAD(thermal_governor_list);
  57
  58 static DEFINE_MUTEX(thermal_list_lock);
  59 static DEFINE_MUTEX(thermal_governor_lock);
  60
  61 static struct thermal_governor *__find_governor(const char *name)
  62 {
  63         struct thermal_governor *pos;
  64
  65         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  66                 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
  67                         return pos;
  68
  69         return NULL;
  70 }
  71
  72 int thermal_register_governor(struct thermal_governor *governor)
  73 {
  74         int err;
  75         const char *name;
  76         struct thermal_zone_device *pos;
  77
  78         if (!governor)
  79                 return -EINVAL;
  80
  81         mutex_lock(&thermal_governor_lock);
  82
  83         err = -EBUSY;
  84         if (__find_governor(governor->name) == NULL) {
  85                 err = 0;
  86                 list_add(&governor->governor_list, &thermal_governor_list);
  87         }
  88
  89         mutex_lock(&thermal_list_lock);
  90
  91         list_for_each_entry(pos, &thermal_tz_list, node) {
  92                 if (pos->governor)
  93                         continue;
  94                 if (pos->tzp)
  95                         name = pos->tzp->governor_name;
  96                 else
  97                         name = DEFAULT_THERMAL_GOVERNOR;
  98                 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH)) {
  99                         if (governor->start) {
 100                                 err = governor->start(pos);
 101                                 if (err < 0)
 102                                         goto exit;
 103                         }
 104                         pos->governor = governor;
 105                 }
 106         }
 107
 108 exit:
 109         mutex_unlock(&thermal_list_lock);
 110         mutex_unlock(&thermal_governor_lock);
 111
 112         return err;
 113 }
 114
 115 void thermal_unregister_governor(struct thermal_governor *governor)
 116 {
 117         struct thermal_zone_device *pos;
 118
 119         if (!governor)
 120                 return;
 121
 122         mutex_lock(&thermal_governor_lock);
 123
 124         if (__find_governor(governor->name) == NULL)
 125                 goto exit;
 126
 127         mutex_lock(&thermal_list_lock);
 128
 129         list_for_each_entry(pos, &thermal_tz_list, node) {
 130                 if (!strnicmp(pos->governor->name, governor->name,
 131                                                 THERMAL_NAME_LENGTH)) {
 132                         if (pos->governor->stop)
 133                                 pos->governor->stop(pos);
 134                         pos->governor = NULL;
 135                 }
 136         }
 137
 138         mutex_unlock(&thermal_list_lock);
 139         list_del(&governor->governor_list);
 140 exit:
 141         mutex_unlock(&thermal_governor_lock);
 142         return;
 143 }
 144
 145 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 146 {
 147         int ret;
 148
 149         if (lock)
 150                 mutex_lock(lock);
 151         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 152         if (lock)
 153                 mutex_unlock(lock);
 154         if (unlikely(ret < 0))
 155                 return ret;
 156         *id = ret;
 157         return 0;
 158 }
 159
 160 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 161 {
 162         if (lock)
 163                 mutex_lock(lock);
 164         idr_remove(idr, id);
 165         if (lock)
 166                 mutex_unlock(lock);
 167 }
 168
 169 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 170 {
 171         enum thermal_trend trend;
 172
 173         if (tz->emul_temperature || !tz->ops->get_trend ||
 174             tz->ops->get_trend(tz, trip, &trend)) {
 175                 if (tz->temperature > tz->last_temperature)
 176                         trend = THERMAL_TREND_RAISING;
 177                 else if (tz->temperature < tz->last_temperature)
 178                         trend = THERMAL_TREND_DROPPING;
 179                 else
 180                         trend = THERMAL_TREND_STABLE;
 181         }
 182
 183         return trend;
 184 }
 185 EXPORT_SYMBOL(get_tz_trend);
 186
 187 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 188                         struct thermal_cooling_device *cdev, int trip)
 189 {
 190         struct thermal_instance *pos = NULL;
 191         struct thermal_instance *target_instance = NULL;
 192
 193         mutex_lock(&tz->lock);
 194         mutex_lock(&cdev->lock);
 195
 196         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 197                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 198                         target_instance = pos;
 199                         break;
 200                 }
 201         }
 202
 203         mutex_unlock(&cdev->lock);
 204         mutex_unlock(&tz->lock);
 205
 206         return target_instance;
 207 }
 208 EXPORT_SYMBOL(get_thermal_instance);
 209
 210 static void print_bind_err_msg(struct thermal_zone_device *tz,
 211                         struct thermal_cooling_device *cdev, int ret)
 212 {
 213         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 214                                 tz->type, cdev->type, ret);
 215 }
 216
 217 static void __bind(struct thermal_zone_device *tz, u64 mask,
 218                         struct thermal_cooling_device *cdev,
 219                         unsigned long *limits)
 220 {
 221         int i, ret;
 222
 223         for (i = 0; i < tz->trips; i++) {
 224                 if (mask & (1ULL << i)) {
 225                         unsigned long upper, lower;
 226
 227                         upper = THERMAL_NO_LIMIT;
 228                         lower = THERMAL_NO_LIMIT;
 229                         if (limits) {
 230                                 lower = limits[i * 2];
 231                                 upper = limits[i * 2 + 1];
 232                         }
 233                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 234                                                                upper, lower);
 235                         if (ret)
 236                                 print_bind_err_msg(tz, cdev, ret);
 237                 }
 238         }
 239 }
 240
 241 static void __unbind(struct thermal_zone_device *tz, u64 mask,
 242                         struct thermal_cooling_device *cdev)
 243 {
 244         int i;
 245
 246         for (i = 0; i < tz->trips; i++)
 247                 if (mask & (1ULL << i))
 248                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 249 }
 250
 251 static void bind_cdev(struct thermal_cooling_device *cdev)
 252 {
 253         int i, ret;
 254         const struct thermal_zone_params *tzp;
 255         struct thermal_zone_device *pos = NULL;
 256
 257         mutex_lock(&thermal_list_lock);
 258
 259         list_for_each_entry(pos, &thermal_tz_list, node) {
 260                 if (!pos->tzp && !pos->ops->bind)
 261                         continue;
 262
 263                 if (pos->ops->bind) {
 264                         ret = pos->ops->bind(pos, cdev);
 265                         if (ret)
 266                                 print_bind_err_msg(pos, cdev, ret);
 267                         continue;
 268                 }
 269
 270                 tzp = pos->tzp;
 271                 if (!tzp || !tzp->tbp)
 272                         continue;
 273
 274                 for (i = 0; i < tzp->num_tbps; i++) {
 275                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 276                                 continue;
 277                         if (tzp->tbp[i].match(pos, cdev))
 278                                 continue;
 279                         tzp->tbp[i].cdev = cdev;
 280                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 281                                tzp->tbp[i].binding_limits);
 282                 }
 283         }
 284
 285         mutex_unlock(&thermal_list_lock);
 286 }
 287
 288 static void bind_tz(struct thermal_zone_device *tz)
 289 {
 290         int i, ret;
 291         struct thermal_cooling_device *pos = NULL;
 292         const struct thermal_zone_params *tzp = tz->tzp;
 293
 294         if (!tzp && !tz->ops->bind)
 295                 return;
 296
 297         mutex_lock(&thermal_list_lock);
 298
 299         /* If there is ops->bind, try to use ops->bind */
 300         if (tz->ops->bind) {
 301                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 302                         ret = tz->ops->bind(tz, pos);
 303                         if (ret)
 304                                 print_bind_err_msg(tz, pos, ret);
 305                 }
 306                 goto exit;
 307         }
 308
 309         if (!tzp || !tzp->tbp)
 310                 goto exit;
 311
 312         list_for_each_entry(pos, &thermal_cdev_list, node) {
 313                 for (i = 0; i < tzp->num_tbps; i++) {
 314                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 315                                 continue;
 316                         if (tzp->tbp[i].match(tz, pos))
 317                                 continue;
 318                         tzp->tbp[i].cdev = pos;
 319                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 320                                tzp->tbp[i].binding_limits);
 321                 }
 322         }
 323 exit:
 324         mutex_unlock(&thermal_list_lock);
 325 }
 326
 327 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 328                                             int delay)
 329 {
 330         if (delay > 1000)
 331                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 332                                  round_jiffies(msecs_to_jiffies(delay)));
 333         else if (delay)
 334                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 335                                  msecs_to_jiffies(delay));
 336         else
 337                 cancel_delayed_work(&tz->poll_queue);
 338 }
 339
 340 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 341 {
 342         mutex_lock(&tz->lock);
 343
 344         if (tz->passive)
 345                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 346         else if (tz->polling_delay)
 347                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 348         else
 349                 thermal_zone_device_set_polling(tz, 0);
 350
 351         mutex_unlock(&tz->lock);
 352 }
 353
 354 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 355                         int trip, enum thermal_trip_type trip_type)
 356 {
 357         if (tz->governor)
 358                 tz->governor->throttle(tz, trip);
 359 }
 360
 361 static void handle_critical_trips(struct thermal_zone_device *tz,
 362                                 int trip, enum thermal_trip_type trip_type)
 363 {
 364         long trip_temp;
 365
 366         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 367
 368         /* If we have not crossed the trip_temp, we do not care. */
 369         if (tz->temperature < trip_temp)
 370                 return;
 371
 372         if (tz->ops->notify)
 373                 tz->ops->notify(tz, trip, trip_type);
 374
 375         if (trip_type == THERMAL_TRIP_CRITICAL) {
 376                 dev_emerg(&tz->device,
 377                           "critical temperature reached(%d C),shutting down\n",
 378                           tz->temperature / 1000);
 379                 orderly_poweroff(true);
 380         }
 381 }
 382
 383 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 384 {
 385         enum thermal_trip_type type;
 386
 387         trace_thermal_trip(tz->type, tz->temperature/1000);
 388
 389         tz->ops->get_trip_type(tz, trip, &type);
 390
 391         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 392                 handle_critical_trips(tz, trip, type);
 393         else
 394                 handle_non_critical_trips(tz, trip, type);
 395         /*
 396          * Alright, we handled this trip successfully.
 397          * So, start monitoring again.
 398          */
 399         monitor_thermal_zone(tz);
 400 }
 401
 402 /**
 403  * thermal_zone_get_temp() - returns its the temperature of thermal zone
 404  * @tz: a valid pointer to a struct thermal_zone_device
 405  * @temp: a valid pointer to where to store the resulting temperature.
 406  *
 407  * When a valid thermal zone reference is passed, it will fetch its
 408  * temperature and fill @temp.
 409  *
 410  * Return: On success returns 0, an error code otherwise
 411  */
 412 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 413 {
 414         int ret = -EINVAL;
 415 #ifdef CONFIG_THERMAL_EMULATION
 416         int count;
 417         unsigned long crit_temp = -1UL;
 418         enum thermal_trip_type type;
 419 #endif
 420
 421         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 422                 goto exit;
 423
 424         mutex_lock(&tz->lock);
 425
 426         ret = tz->ops->get_temp(tz, temp);
 427 #ifdef CONFIG_THERMAL_EMULATION
 428         if (!tz->emul_temperature)
 429                 goto skip_emul;
 430
 431         for (count = 0; count < tz->trips; count++) {
 432                 ret = tz->ops->get_trip_type(tz, count, &type);
 433                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 434                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 435                         break;
 436                 }
 437         }
 438
 439         if (ret)
 440                 goto skip_emul;
 441
 442         if (*temp < crit_temp)
 443                 *temp = tz->emul_temperature;
 444 skip_emul:
 445 #endif
 446         mutex_unlock(&tz->lock);
 447 exit:
 448         return ret;
 449 }
 450 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 451
 452 static void update_temperature(struct thermal_zone_device *tz)
 453 {
 454         long temp;
 455         int ret;
 456
 457         ret = thermal_zone_get_temp(tz, &temp);
 458         if (ret) {
 459                 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
 460                          tz->id);
 461                 return;
 462         }
 463
 464         mutex_lock(&tz->lock);
 465         tz->last_temperature = tz->temperature;
 466         tz->temperature = temp;
 467         mutex_unlock(&tz->lock);
 468 }
 469
 470 void thermal_zone_device_update(struct thermal_zone_device *tz)
 471 {
 472         int count;
 473
 474         if (!tz->ops->get_temp)
 475                 return;
 476
 477         update_temperature(tz);
 478
 479         for (count = 0; count < tz->trips; count++)
 480                 handle_thermal_trip(tz, count);
 481 }
 482 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 483
 484 static void thermal_zone_device_check(struct work_struct *work)
 485 {
 486         struct thermal_zone_device *tz = container_of(work, struct
 487                                                       thermal_zone_device,
 488                                                       poll_queue.work);
 489         thermal_zone_device_update(tz);
 490 }
 491
 492 /* sys I/F for thermal zone */
 493
 494 #define to_thermal_zone(_dev) \
 495         container_of(_dev, struct thermal_zone_device, device)
 496
 497 static ssize_t
 498 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 499 {
 500         struct thermal_zone_device *tz = to_thermal_zone(dev);
 501
 502         return sprintf(buf, "%s\n", tz->type);
 503 }
 504
 505 static ssize_t
 506 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 507 {
 508         struct thermal_zone_device *tz = to_thermal_zone(dev);
 509         long temperature;
 510         int ret;
 511
 512         ret = thermal_zone_get_temp(tz, &temperature);
 513
 514         if (ret)
 515                 return ret;
 516
 517         return sprintf(buf, "%ld\n", temperature);
 518 }
 519
 520 static ssize_t
 521 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 522 {
 523         struct thermal_zone_device *tz = to_thermal_zone(dev);
 524         enum thermal_device_mode mode;
 525         int result;
 526
 527         if (!tz->ops->get_mode)
 528                 return -EPERM;
 529
 530         result = tz->ops->get_mode(tz, &mode);
 531         if (result)
 532                 return result;
 533
 534         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 535                        : "disabled");
 536 }
 537
 538 static ssize_t
 539 mode_store(struct device *dev, struct device_attribute *attr,
 540            const char *buf, size_t count)
 541 {
 542         struct thermal_zone_device *tz = to_thermal_zone(dev);
 543         int result;
 544
 545         if (!tz->ops->set_mode)
 546                 return -EPERM;
 547
 548         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 549                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 550         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 551                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 552         else
 553                 result = -EINVAL;
 554
 555         if (result)
 556                 return result;
 557
 558         return count;
 559 }
 560
 561 static ssize_t
 562 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 563                      char *buf)
 564 {
 565         struct thermal_zone_device *tz = to_thermal_zone(dev);
 566         enum thermal_trip_type type;
 567         int trip, result;
 568
 569         if (!tz->ops->get_trip_type)
 570                 return -EPERM;
 571
 572         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 573                 return -EINVAL;
 574
 575         result = tz->ops->get_trip_type(tz, trip, &type);
 576         if (result)
 577                 return result;
 578
 579         switch (type) {
 580         case THERMAL_TRIP_CRITICAL:
 581                 return sprintf(buf, "critical\n");
 582         case THERMAL_TRIP_HOT:
 583                 return sprintf(buf, "hot\n");
 584         case THERMAL_TRIP_PASSIVE:
 585                 return sprintf(buf, "passive\n");
 586         case THERMAL_TRIP_ACTIVE:
 587                 return sprintf(buf, "active\n");
 588         default:
 589                 return sprintf(buf, "unknown\n");
 590         }
 591 }
 592
 593 static ssize_t
 594 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 595                      const char *buf, size_t count)
 596 {
 597         struct thermal_zone_device *tz = to_thermal_zone(dev);
 598         int trip, ret;
 599         unsigned long temperature;
 600
 601         if (!tz->ops->set_trip_temp)
 602                 return -EPERM;
 603
 604         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 605                 return -EINVAL;
 606
 607         if (kstrtoul(buf, 10, &temperature))
 608                 return -EINVAL;
 609
 610         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 611
 612         return ret ? ret : count;
 613 }
 614
 615 static ssize_t
 616 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 617                      char *buf)
 618 {
 619         struct thermal_zone_device *tz = to_thermal_zone(dev);
 620         int trip, ret;
 621         long temperature;
 622
 623         if (!tz->ops->get_trip_temp)
 624                 return -EPERM;
 625
 626         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 627                 return -EINVAL;
 628
 629         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 630
 631         if (ret)
 632                 return ret;
 633
 634         return sprintf(buf, "%ld\n", temperature);
 635 }
 636
 637 static ssize_t
 638 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 639                         const char *buf, size_t count)
 640 {
 641         struct thermal_zone_device *tz = to_thermal_zone(dev);
 642         int trip, ret;
 643         unsigned long temperature;
 644
 645         if (!tz->ops->set_trip_hyst)
 646                 return -EPERM;
 647
 648         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 649                 return -EINVAL;
 650
 651         if (kstrtoul(buf, 10, &temperature))
 652                 return -EINVAL;
 653
 654         /*
 655          * We are not doing any check on the 'temperature' value
 656          * here. The driver implementing 'set_trip_hyst' has to
 657          * take care of this.
 658          */
 659         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 660
 661         return ret ? ret : count;
 662 }
 663
 664 static ssize_t
 665 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 666                         char *buf)
 667 {
 668         struct thermal_zone_device *tz = to_thermal_zone(dev);
 669         int trip, ret;
 670         unsigned long temperature;
 671
 672         if (!tz->ops->get_trip_hyst)
 673                 return -EPERM;
 674
 675         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 676                 return -EINVAL;
 677
 678         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 679
 680         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 681 }
 682
 683 static ssize_t
 684 passive_store(struct device *dev, struct device_attribute *attr,
 685                     const char *buf, size_t count)
 686 {
 687         struct thermal_zone_device *tz = to_thermal_zone(dev);
 688         struct thermal_cooling_device *cdev = NULL;
 689         int state;
 690
 691         if (!sscanf(buf, "%d\n", &state))
 692                 return -EINVAL;
 693
 694         /* sanity check: values below 1000 millicelcius don't make sense
 695          * and can cause the system to go into a thermal heart attack
 696          */
 697         if (state && state < 1000)
 698                 return -EINVAL;
 699
 700         if (state && !tz->forced_passive) {
 701                 mutex_lock(&thermal_list_lock);
 702                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 703                         if (!strncmp("Processor", cdev->type,
 704                                      sizeof("Processor")))
 705                                 thermal_zone_bind_cooling_device(tz,
 706                                                 THERMAL_TRIPS_NONE, cdev,
 707                                                 THERMAL_NO_LIMIT,
 708                                                 THERMAL_NO_LIMIT);
 709                 }
 710                 mutex_unlock(&thermal_list_lock);
 711                 if (!tz->passive_delay)
 712                         tz->passive_delay = 1000;
 713         } else if (!state && tz->forced_passive) {
 714                 mutex_lock(&thermal_list_lock);
 715                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 716                         if (!strncmp("Processor", cdev->type,
 717                                      sizeof("Processor")))
 718                                 thermal_zone_unbind_cooling_device(tz,
 719                                                                    THERMAL_TRIPS_NONE,
 720                                                                    cdev);
 721                 }
 722                 mutex_unlock(&thermal_list_lock);
 723                 tz->passive_delay = 0;
 724         }
 725
 726         tz->forced_passive = state;
 727
 728         thermal_zone_device_update(tz);
 729
 730         return count;
 731 }
 732
 733 static ssize_t
 734 passive_show(struct device *dev, struct device_attribute *attr,
 735                    char *buf)
 736 {
 737         struct thermal_zone_device *tz = to_thermal_zone(dev);
 738
 739         return sprintf(buf, "%d\n", tz->forced_passive);
 740 }
 741
 742 static ssize_t
 743 passive_delay_store(struct device *dev, struct device_attribute *attr,
 744                     const char *buf, size_t count)
 745 {
 746         struct thermal_zone_device *tz = to_thermal_zone(dev);
 747         int passive_delay;
 748
 749         if (!sscanf(buf, "%d\n", &passive_delay))
 750                 return -EINVAL;
 751
 752         tz->passive_delay = passive_delay;
 753         thermal_zone_device_update(tz);
 754         return count;
 755 }
 756
 757 static ssize_t
 758 passive_delay_show(struct device *dev, struct device_attribute *attr,
 759                    char *buf)
 760 {
 761         struct thermal_zone_device *tz = to_thermal_zone(dev);
 762
 763         return sprintf(buf, "%d\n", tz->passive_delay);
 764 }
 765
 766 static ssize_t
 767 polling_delay_store(struct device *dev, struct device_attribute *attr,
 768                     const char *buf, size_t count)
 769 {
 770         struct thermal_zone_device *tz = to_thermal_zone(dev);
 771         int polling_delay;
 772
 773         if (!sscanf(buf, "%d\n", &polling_delay))
 774                 return -EINVAL;
 775
 776         tz->polling_delay = polling_delay;
 777         thermal_zone_device_update(tz);
 778         return count;
 779 }
 780
 781 static ssize_t
 782 polling_delay_show(struct device *dev, struct device_attribute *attr,
 783                    char *buf)
 784 {
 785         struct thermal_zone_device *tz = to_thermal_zone(dev);
 786
 787         return sprintf(buf, "%d\n", tz->polling_delay);
 788 }
 789
 790 static ssize_t
 791 policy_store(struct device *dev, struct device_attribute *attr,
 792                     const char *buf, size_t count)
 793 {
 794         int ret = -EINVAL;
 795         struct thermal_zone_device *tz = to_thermal_zone(dev);
 796         struct thermal_governor *gov;
 797         char name[THERMAL_NAME_LENGTH];
 798
 799         snprintf(name, sizeof(name), "%s", buf);
 800
 801         mutex_lock(&thermal_governor_lock);
 802
 803         if ((strlen(buf) >= THERMAL_NAME_LENGTH) || !sscanf(buf, "%s\n", name))
 804                 goto exit;
 805
 806         gov = __find_governor((const char *)strim(name));
 807         if (!gov)
 808                 goto exit;
 809
 810         if (gov == tz->governor) {
 811                 ret = count;
 812                 goto exit;
 813         }
 814
 815         if (tz->governor && tz->governor->stop)
 816                 tz->governor->stop(tz);
 817
 818         if (gov->start) {
 819                 ret = gov->start(tz);
 820                 if (ret < 0) {
 821                         if (tz->governor && tz->governor->start)
 822                                 tz->governor->start(tz);
 823                         goto exit;
 824                 }
 825         }
 826
 827         tz->governor = gov;
 828         ret = count;
 829
 830 exit:
 831         mutex_unlock(&thermal_governor_lock);
 832         return ret;
 833 }
 834
 835 static ssize_t
 836 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 837 {
 838         struct thermal_zone_device *tz = to_thermal_zone(dev);
 839
 840         return sprintf(buf, "%s\n", tz->governor->name);
 841 }
 842
 843 static ssize_t
 844 available_policies_show(struct device *dev, struct device_attribute *devattr,
 845                         char *buf)
 846 {
 847         struct thermal_governor *pos;
 848         ssize_t count = 0;
 849
 850         mutex_lock(&thermal_governor_lock);
 851
 852         list_for_each_entry(pos, &thermal_governor_list, governor_list)
 853                 count += sprintf(buf + count, "%s ", pos->name);
 854         count += sprintf(buf + count, "\n");
 855
 856         mutex_unlock(&thermal_governor_lock);
 857         return count;
 858 }
 859
 860 #ifdef CONFIG_THERMAL_EMULATION
 861 static ssize_t
 862 emul_temp_store(struct device *dev, struct device_attribute *attr,
 863                      const char *buf, size_t count)
 864 {
 865         struct thermal_zone_device *tz = to_thermal_zone(dev);
 866         int ret = 0;
 867         unsigned long temperature;
 868
 869         if (kstrtoul(buf, 10, &temperature))
 870                 return -EINVAL;
 871
 872         if (!tz->ops->set_emul_temp) {
 873                 mutex_lock(&tz->lock);
 874                 tz->emul_temperature = temperature;
 875                 mutex_unlock(&tz->lock);
 876         } else {
 877                 ret = tz->ops->set_emul_temp(tz, temperature);
 878         }
 879
 880         return ret ? ret : count;
 881 }
 882 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 883 #endif/*CONFIG_THERMAL_EMULATION*/
 884
 885 static DEVICE_ATTR(type, 0444, type_show, NULL);
 886 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 887 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 888 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 889 static DEVICE_ATTR(passive_delay, S_IRUGO | S_IWUSR,
 890                    passive_delay_show, passive_delay_store);
 891 static DEVICE_ATTR(polling_delay, S_IRUGO | S_IWUSR,
 892                    polling_delay_show, polling_delay_store);
 893 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 894 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
 895
 896 /* sys I/F for cooling device */
 897 #define to_cooling_device(_dev) \
 898         container_of(_dev, struct thermal_cooling_device, device)
 899
 900 static ssize_t
 901 thermal_cooling_device_type_show(struct device *dev,
 902                                  struct device_attribute *attr, char *buf)
 903 {
 904         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 905
 906         return sprintf(buf, "%s\n", cdev->type);
 907 }
 908
 909 static ssize_t
 910 thermal_cooling_device_max_state_show(struct device *dev,
 911                                       struct device_attribute *attr, char *buf)
 912 {
 913         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 914         unsigned long state;
 915         int ret;
 916
 917         ret = cdev->ops->get_max_state(cdev, &state);
 918         if (ret)
 919                 return ret;
 920         return sprintf(buf, "%ld\n", state);
 921 }
 922
 923 static ssize_t
 924 thermal_cooling_device_cur_state_show(struct device *dev,
 925                                       struct device_attribute *attr, char *buf)
 926 {
 927         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 928         unsigned long state;
 929         int ret;
 930
 931         ret = cdev->ops->get_cur_state(cdev, &state);
 932         if (ret)
 933                 return ret;
 934         return sprintf(buf, "%ld\n", state);
 935 }
 936
 937 static ssize_t
 938 thermal_cooling_device_cur_state_store(struct device *dev,
 939                                        struct device_attribute *attr,
 940                                        const char *buf, size_t count)
 941 {
 942         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 943         unsigned long state;
 944         int result;
 945
 946         if (!sscanf(buf, "%ld\n", &state))
 947                 return -EINVAL;
 948
 949         if ((long)state < 0)
 950                 return -EINVAL;
 951
 952         result = cdev->ops->set_cur_state(cdev, state);
 953         if (result)
 954                 return result;
 955         return count;
 956 }
 957
 958 static struct device_attribute dev_attr_cdev_type =
 959 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 960 static DEVICE_ATTR(max_state, 0444,
 961                    thermal_cooling_device_max_state_show, NULL);
 962 static DEVICE_ATTR(cur_state, 0644,
 963                    thermal_cooling_device_cur_state_show,
 964                    thermal_cooling_device_cur_state_store);
 965
 966 static ssize_t
 967 thermal_cooling_device_trip_point_show(struct device *dev,
 968                                        struct device_attribute *attr, char *buf)
 969 {
 970         struct thermal_instance *instance;
 971
 972         instance =
 973             container_of(attr, struct thermal_instance, attr);
 974
 975         if (instance->trip == THERMAL_TRIPS_NONE)
 976                 return sprintf(buf, "-1\n");
 977         else
 978                 return sprintf(buf, "%d\n", instance->trip);
 979 }
 980
 981 /* Device management */
 982
 983 /**
 984  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
 985  * @tz:         pointer to struct thermal_zone_device
 986  * @trip:       indicates which trip point the cooling devices is
 987  *              associated with in this thermal zone.
 988  * @cdev:       pointer to struct thermal_cooling_device
 989  * @upper:      the Maximum cooling state for this trip point.
 990  *              THERMAL_NO_LIMIT means no upper limit,
 991  *              and the cooling device can be in max_state.
 992  * @lower:      the Minimum cooling state can be used for this trip point.
 993  *              THERMAL_NO_LIMIT means no lower limit,
 994  *              and the cooling device can be in cooling state 0.
 995  *
 996  * This interface function bind a thermal cooling device to the certain trip
 997  * point of a thermal zone device.
 998  * This function is usually called in the thermal zone device .bind callback.
 999  *
1000  * Return: 0 on success, the proper error value otherwise.
1001  */
1002 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1003                                      int trip,
1004                                      struct thermal_cooling_device *cdev,
1005                                      unsigned long upper, unsigned long lower)
1006 {
1007         struct thermal_instance *dev;
1008         struct thermal_instance *pos;
1009         struct thermal_zone_device *pos1;
1010         struct thermal_cooling_device *pos2;
1011         unsigned long max_state;
1012         int result;
1013
1014         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1015                 return -EINVAL;
1016
1017         list_for_each_entry(pos1, &thermal_tz_list, node) {
1018                 if (pos1 == tz)
1019                         break;
1020         }
1021         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1022                 if (pos2 == cdev)
1023                         break;
1024         }
1025
1026         if (tz != pos1 || cdev != pos2)
1027                 return -EINVAL;
1028
1029         cdev->ops->get_max_state(cdev, &max_state);
1030
1031         /* lower default 0, upper default max_state */
1032         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1033         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1034
1035         if (lower > upper || upper > max_state)
1036                 return -EINVAL;
1037
1038         dev =
1039             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1040         if (!dev)
1041                 return -ENOMEM;
1042         dev->tz = tz;
1043         dev->cdev = cdev;
1044         dev->trip = trip;
1045         dev->upper = upper;
1046         dev->lower = lower;
1047         dev->target = THERMAL_NO_TARGET;
1048
1049         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1050         if (result)
1051                 goto free_mem;
1052
1053         sprintf(dev->name, "cdev%d", dev->id);
1054         result =
1055             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1056         if (result)
1057                 goto release_idr;
1058
1059         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1060         sysfs_attr_init(&dev->attr.attr);
1061         dev->attr.attr.name = dev->attr_name;
1062         dev->attr.attr.mode = 0444;
1063         dev->attr.show = thermal_cooling_device_trip_point_show;
1064         result = device_create_file(&tz->device, &dev->attr);
1065         if (result)
1066                 goto remove_symbol_link;
1067
1068         mutex_lock(&tz->lock);
1069         mutex_lock(&cdev->lock);
1070         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1071             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1072                 result = -EEXIST;
1073                 break;
1074         }
1075         if (!result) {
1076                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1077                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1078         }
1079         mutex_unlock(&cdev->lock);
1080         mutex_unlock(&tz->lock);
1081
1082         if (!result)
1083                 return 0;
1084
1085         device_remove_file(&tz->device, &dev->attr);
1086 remove_symbol_link:
1087         sysfs_remove_link(&tz->device.kobj, dev->name);
1088 release_idr:
1089         release_idr(&tz->idr, &tz->lock, dev->id);
1090 free_mem:
1091         kfree(dev);
1092         return result;
1093 }
1094 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1095
1096 /**
1097  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1098  *                                        thermal zone.
1099  * @tz:         pointer to a struct thermal_zone_device.
1100  * @trip:       indicates which trip point the cooling devices is
1101  *              associated with in this thermal zone.
1102  * @cdev:       pointer to a struct thermal_cooling_device.
1103  *
1104  * This interface function unbind a thermal cooling device from the certain
1105  * trip point of a thermal zone device.
1106  * This function is usually called in the thermal zone device .unbind callback.
1107  *
1108  * Return: 0 on success, the proper error value otherwise.
1109  */
1110 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1111                                        int trip,
1112                                        struct thermal_cooling_device *cdev)
1113 {
1114         struct thermal_instance *pos, *next;
1115
1116         mutex_lock(&tz->lock);
1117         mutex_lock(&cdev->lock);
1118         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1119                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1120                         list_del(&pos->tz_node);
1121                         list_del(&pos->cdev_node);
1122                         mutex_unlock(&cdev->lock);
1123                         mutex_unlock(&tz->lock);
1124                         goto unbind;
1125                 }
1126         }
1127         mutex_unlock(&cdev->lock);
1128         mutex_unlock(&tz->lock);
1129
1130         return -ENODEV;
1131
1132 unbind:
1133         device_remove_file(&tz->device, &pos->attr);
1134         sysfs_remove_link(&tz->device.kobj, pos->name);
1135         release_idr(&tz->idr, &tz->lock, pos->id);
1136         kfree(pos);
1137         return 0;
1138 }
1139 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1140
1141 static void thermal_release(struct device *dev)
1142 {
1143         struct thermal_zone_device *tz;
1144         struct thermal_cooling_device *cdev;
1145
1146         if (!strncmp(dev_name(dev), "thermal_zone",
1147                      sizeof("thermal_zone") - 1)) {
1148                 tz = to_thermal_zone(dev);
1149                 kfree(tz);
1150         } else if(!strncmp(dev_name(dev), "cooling_device",
1151                         sizeof("cooling_device") - 1)){
1152                 cdev = to_cooling_device(dev);
1153                 kfree(cdev);
1154         }
1155 }
1156
1157 static struct class thermal_class = {
1158         .name = "thermal",
1159         .dev_release = thermal_release,
1160 };
1161
1162 /**
1163  * __thermal_cooling_device_register() - register a new thermal cooling device
1164  * @np:         a pointer to a device tree node.
1165  * @type:       the thermal cooling device type.
1166  * @devdata:    device private data.
1167  * @ops:                standard thermal cooling devices callbacks.
1168  *
1169  * This interface function adds a new thermal cooling device (fan/processor/...)
1170  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1171  * to all the thermal zone devices registered at the same time.
1172  * It also gives the opportunity to link the cooling device to a device tree
1173  * node, so that it can be bound to a thermal zone created out of device tree.
1174  *
1175  * Return: a pointer to the created struct thermal_cooling_device or an
1176  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1177  */
1178 static struct thermal_cooling_device *
1179 __thermal_cooling_device_register(struct device_node *np,
1180                                   char *type, void *devdata,
1181                                   const struct thermal_cooling_device_ops *ops)
1182 {
1183         struct thermal_cooling_device *cdev;
1184         int result;
1185
1186         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1187                 return ERR_PTR(-EINVAL);
1188
1189         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1190             !ops->set_cur_state)
1191                 return ERR_PTR(-EINVAL);
1192
1193         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1194         if (!cdev)
1195                 return ERR_PTR(-ENOMEM);
1196
1197         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1198         if (result) {
1199                 kfree(cdev);
1200                 return ERR_PTR(result);
1201         }
1202
1203         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1204         mutex_init(&cdev->lock);
1205         INIT_LIST_HEAD(&cdev->thermal_instances);
1206         cdev->np = np;
1207         cdev->ops = ops;
1208         cdev->updated = false;
1209         cdev->device.class = &thermal_class;
1210         cdev->devdata = devdata;
1211         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1212         result = device_register(&cdev->device);
1213         if (result) {
1214                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1215                 kfree(cdev);
1216                 return ERR_PTR(result);
1217         }
1218
1219         /* sys I/F */
1220         if (type) {
1221                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1222                 if (result)
1223                         goto unregister;
1224         }
1225
1226         result = device_create_file(&cdev->device, &dev_attr_max_state);
1227         if (result)
1228                 goto unregister;
1229
1230         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1231         if (result)
1232                 goto unregister;
1233
1234         /* Add 'this' new cdev to the global cdev list */
1235         mutex_lock(&thermal_list_lock);
1236         list_add(&cdev->node, &thermal_cdev_list);
1237         mutex_unlock(&thermal_list_lock);
1238
1239         /* Update binding information for 'this' new cdev */
1240         bind_cdev(cdev);
1241
1242         return cdev;
1243
1244 unregister:
1245         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1246         device_unregister(&cdev->device);
1247         return ERR_PTR(result);
1248 }
1249
1250 /**
1251  * thermal_cooling_device_register() - register a new thermal cooling device
1252  * @type:       the thermal cooling device type.
1253  * @devdata:    device private data.
1254  * @ops:                standard thermal cooling devices callbacks.
1255  *
1256  * This interface function adds a new thermal cooling device (fan/processor/...)
1257  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1258  * to all the thermal zone devices registered at the same time.
1259  *
1260  * Return: a pointer to the created struct thermal_cooling_device or an
1261  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1262  */
1263 struct thermal_cooling_device *
1264 thermal_cooling_device_register(char *type, void *devdata,
1265                                 const struct thermal_cooling_device_ops *ops)
1266 {
1267         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1268 }
1269 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1270
1271 /**
1272  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1273  * @np:         a pointer to a device tree node.
1274  * @type:       the thermal cooling device type.
1275  * @devdata:    device private data.
1276  * @ops:                standard thermal cooling devices callbacks.
1277  *
1278  * This function will register a cooling device with device tree node reference.
1279  * This interface function adds a new thermal cooling device (fan/processor/...)
1280  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1281  * to all the thermal zone devices registered at the same time.
1282  *
1283  * Return: a pointer to the created struct thermal_cooling_device or an
1284  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1285  */
1286 struct thermal_cooling_device *
1287 thermal_of_cooling_device_register(struct device_node *np,
1288                                    char *type, void *devdata,
1289                                    const struct thermal_cooling_device_ops *ops)
1290 {
1291         return __thermal_cooling_device_register(np, type, devdata, ops);
1292 }
1293 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1294
1295 /**
1296  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1297  * @cdev:       the thermal cooling device to remove.
1298  *
1299  * thermal_cooling_device_unregister() must be called when the device is no
1300  * longer needed.
1301  */
1302 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1303 {
1304         int i;
1305         const struct thermal_zone_params *tzp;
1306         struct thermal_zone_device *tz;
1307         struct thermal_cooling_device *pos = NULL;
1308
1309         if (!cdev)
1310                 return;
1311
1312         mutex_lock(&thermal_list_lock);
1313         list_for_each_entry(pos, &thermal_cdev_list, node)
1314             if (pos == cdev)
1315                 break;
1316         if (pos != cdev) {
1317                 /* thermal cooling device not found */
1318                 mutex_unlock(&thermal_list_lock);
1319                 return;
1320         }
1321         list_del(&cdev->node);
1322
1323         /* Unbind all thermal zones associated with 'this' cdev */
1324         list_for_each_entry(tz, &thermal_tz_list, node) {
1325                 if (tz->ops->unbind) {
1326                         tz->ops->unbind(tz, cdev);
1327                         continue;
1328                 }
1329
1330                 if (!tz->tzp || !tz->tzp->tbp)
1331                         continue;
1332
1333                 tzp = tz->tzp;
1334                 for (i = 0; i < tzp->num_tbps; i++) {
1335                         if (tzp->tbp[i].cdev == cdev) {
1336                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1337                                 tzp->tbp[i].cdev = NULL;
1338                         }
1339                 }
1340         }
1341
1342         mutex_unlock(&thermal_list_lock);
1343
1344         if (cdev->type[0])
1345                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1346         device_remove_file(&cdev->device, &dev_attr_max_state);
1347         device_remove_file(&cdev->device, &dev_attr_cur_state);
1348
1349         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1350         device_unregister(&cdev->device);
1351         return;
1352 }
1353 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1354
1355 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1356 {
1357         struct thermal_instance *instance;
1358         unsigned long target = 0;
1359
1360         /* cooling device is updated*/
1361         if (cdev->updated)
1362                 return;
1363
1364         mutex_lock(&cdev->lock);
1365         /* Make sure cdev enters the deepest cooling state */
1366         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1367                 if (instance->target == THERMAL_NO_TARGET)
1368                         continue;
1369                 if (instance->target > target)
1370                         target = instance->target;
1371         }
1372         mutex_unlock(&cdev->lock);
1373         cdev->ops->set_cur_state(cdev, target);
1374         trace_cooling_device_update(cdev->type, target);
1375         cdev->updated = true;
1376 }
1377 EXPORT_SYMBOL(thermal_cdev_update);
1378
1379 /**
1380  * thermal_notify_framework - Sensor drivers use this API to notify framework
1381  * @tz:         thermal zone device
1382  * @trip:       indicates which trip point has been crossed
1383  *
1384  * This function handles the trip events from sensor drivers. It starts
1385  * throttling the cooling devices according to the policy configured.
1386  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1387  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1388  * The throttling policy is based on the configured platform data; if no
1389  * platform data is provided, this uses the step_wise throttling policy.
1390  */
1391 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1392 {
1393         handle_thermal_trip(tz, trip);
1394 }
1395 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1396
1397 struct thermal_zone_device *thermal_zone_device_find(void *data,
1398         int (*match)(struct thermal_zone_device *, void *))
1399 {
1400         struct thermal_zone_device *thz;
1401
1402         mutex_lock(&thermal_list_lock);
1403         list_for_each_entry(thz, &thermal_tz_list, node)
1404                 if (match(thz, data)) {
1405                         mutex_unlock(&thermal_list_lock);
1406                         return thz;
1407                 }
1408
1409         mutex_unlock(&thermal_list_lock);
1410         return NULL;
1411 }
1412 EXPORT_SYMBOL(thermal_zone_device_find);
1413
1414 struct thermal_zone_device *thermal_zone_device_find_by_name(const char *name)
1415 {
1416         struct thermal_zone_device *thz;
1417
1418         if (!name)
1419                 return NULL;
1420
1421         mutex_lock(&thermal_list_lock);
1422         list_for_each_entry(thz, &thermal_tz_list, node) {
1423                 if (!strncmp(name, thz->type, strlen(name))) {
1424                         mutex_unlock(&thermal_list_lock);
1425                         return thz;
1426                 }
1427         }
1428         mutex_unlock(&thermal_list_lock);
1429         return NULL;
1430 }
1431 EXPORT_SYMBOL(thermal_zone_device_find_by_name);
1432
1433 /**
1434  * create_trip_attrs() - create attributes for trip points
1435  * @tz:         the thermal zone device
1436  * @mask:       Writeable trip point bitmap.
1437  *
1438  * helper function to instantiate sysfs entries for every trip
1439  * point and its properties of a struct thermal_zone_device.
1440  *
1441  * Return: 0 on success, the proper error value otherwise.
1442  */
1443 static int create_trip_attrs(struct thermal_zone_device *tz, u64 mask)
1444 {
1445         int indx;
1446         int size = sizeof(struct thermal_attr) * tz->trips;
1447
1448         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1449         if (!tz->trip_type_attrs)
1450                 return -ENOMEM;
1451
1452         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1453         if (!tz->trip_temp_attrs) {
1454                 kfree(tz->trip_type_attrs);
1455                 return -ENOMEM;
1456         }
1457
1458         if (tz->ops->get_trip_hyst) {
1459                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1460                 if (!tz->trip_hyst_attrs) {
1461                         kfree(tz->trip_type_attrs);
1462                         kfree(tz->trip_temp_attrs);
1463                         return -ENOMEM;
1464                 }
1465         }
1466
1467
1468         for (indx = 0; indx < tz->trips; indx++) {
1469                 /* create trip type attribute */
1470                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1471                          "trip_point_%d_type", indx);
1472
1473                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1474                 tz->trip_type_attrs[indx].attr.attr.name =
1475                                                 tz->trip_type_attrs[indx].name;
1476                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1477                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1478
1479                 device_create_file(&tz->device,
1480                                    &tz->trip_type_attrs[indx].attr);
1481
1482                 /* create trip temp attribute */
1483                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1484                          "trip_point_%d_temp", indx);
1485
1486                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1487                 tz->trip_temp_attrs[indx].attr.attr.name =
1488                                                 tz->trip_temp_attrs[indx].name;
1489                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1490                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1491                 if (mask & (1ULL << indx)) {
1492                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1493                         tz->trip_temp_attrs[indx].attr.store =
1494                                                         trip_point_temp_store;
1495                 }
1496
1497                 device_create_file(&tz->device,
1498                                    &tz->trip_temp_attrs[indx].attr);
1499
1500                 /* create Optional trip hyst attribute */
1501                 if (!tz->ops->get_trip_hyst)
1502                         continue;
1503                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1504                          "trip_point_%d_hyst", indx);
1505
1506                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1507                 tz->trip_hyst_attrs[indx].attr.attr.name =
1508                                         tz->trip_hyst_attrs[indx].name;
1509                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1510                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1511                 if (tz->ops->set_trip_hyst) {
1512                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1513                         tz->trip_hyst_attrs[indx].attr.store =
1514                                         trip_point_hyst_store;
1515                 }
1516
1517                 device_create_file(&tz->device,
1518                                    &tz->trip_hyst_attrs[indx].attr);
1519         }
1520         return 0;
1521 }
1522
1523 static void remove_trip_attrs(struct thermal_zone_device *tz)
1524 {
1525         int indx;
1526
1527         for (indx = 0; indx < tz->trips; indx++) {
1528                 device_remove_file(&tz->device,
1529                                    &tz->trip_type_attrs[indx].attr);
1530                 device_remove_file(&tz->device,
1531                                    &tz->trip_temp_attrs[indx].attr);
1532                 if (tz->ops->get_trip_hyst)
1533                         device_remove_file(&tz->device,
1534                                   &tz->trip_hyst_attrs[indx].attr);
1535         }
1536         kfree(tz->trip_type_attrs);
1537         kfree(tz->trip_temp_attrs);
1538         kfree(tz->trip_hyst_attrs);
1539 }
1540
1541 /**
1542  * thermal_zone_device_register() - register a new thermal zone device
1543  * @type:       the thermal zone device type
1544  * @trips:      the number of trip points the thermal zone support
1545  * @mask:       a bit string indicating the writeablility of trip points
1546  * @devdata:    private device data
1547  * @ops:        standard thermal zone device callbacks
1548  * @tzp:        thermal zone platform parameters
1549  * @passive_delay: number of milliseconds to wait between polls when
1550  *                 performing passive cooling
1551  * @polling_delay: number of milliseconds to wait between polls when checking
1552  *                 whether trip points have been crossed (0 for interrupt
1553  *                 driven systems)
1554  *
1555  * This interface function adds a new thermal zone device (sensor) to
1556  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1557  * thermal cooling devices registered at the same time.
1558  * thermal_zone_device_unregister() must be called when the device is no
1559  * longer needed. The passive cooling depends on the .get_trend() return value.
1560  *
1561  * Return: a pointer to the created struct thermal_zone_device or an
1562  * in case of error, an ERR_PTR. Caller must check return value with
1563  * IS_ERR*() helpers.
1564  */
1565 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1566         int trips, u64 mask, void *devdata,
1567         struct thermal_zone_device_ops *ops,
1568         const struct thermal_zone_params *tzp,
1569         int passive_delay, int polling_delay)
1570 {
1571         struct thermal_zone_device *tz;
1572         enum thermal_trip_type trip_type;
1573         int result;
1574         int count;
1575         int passive = 0;
1576
1577         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1578                 return ERR_PTR(-EINVAL);
1579
1580         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1581                 return ERR_PTR(-EINVAL);
1582
1583         if (!ops)
1584                 return ERR_PTR(-EINVAL);
1585
1586         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1587                 return ERR_PTR(-EINVAL);
1588
1589         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1590         if (!tz)
1591                 return ERR_PTR(-ENOMEM);
1592
1593         INIT_LIST_HEAD(&tz->thermal_instances);
1594         idr_init(&tz->idr);
1595         mutex_init(&tz->lock);
1596         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1597         if (result) {
1598                 kfree(tz);
1599                 return ERR_PTR(result);
1600         }
1601
1602         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1603         tz->ops = ops;
1604         tz->tzp = tzp;
1605         tz->device.class = &thermal_class;
1606         tz->devdata = devdata;
1607         tz->trips = trips;
1608         tz->passive_delay = passive_delay;
1609         tz->polling_delay = polling_delay;
1610
1611         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1612         result = device_register(&tz->device);
1613         if (result) {
1614                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1615                 kfree(tz);
1616                 return ERR_PTR(result);
1617         }
1618
1619         /* sys I/F */
1620         if (type) {
1621                 result = device_create_file(&tz->device, &dev_attr_type);
1622                 if (result)
1623                         goto unregister;
1624         }
1625
1626         result = device_create_file(&tz->device, &dev_attr_temp);
1627         if (result)
1628                 goto unregister;
1629
1630         if (ops->get_mode) {
1631                 result = device_create_file(&tz->device, &dev_attr_mode);
1632                 if (result)
1633                         goto unregister;
1634         }
1635
1636         result = create_trip_attrs(tz, mask);
1637         if (result)
1638                 goto unregister;
1639
1640         for (count = 0; count < trips; count++) {
1641                 tz->ops->get_trip_type(tz, count, &trip_type);
1642                 if (trip_type == THERMAL_TRIP_PASSIVE)
1643                         passive = 1;
1644         }
1645
1646         if (!passive) {
1647                 result = device_create_file(&tz->device, &dev_attr_passive);
1648                 if (result)
1649                         goto unregister;
1650         }
1651
1652 #ifdef CONFIG_THERMAL_EMULATION
1653         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1654         if (result)
1655                 goto unregister;
1656 #endif
1657         /* Create policy attribute */
1658         result = device_create_file(&tz->device, &dev_attr_policy);
1659         if (result)
1660                 goto unregister;
1661
1662         /* Create passive_delay attribute */
1663         result = device_create_file(&tz->device, &dev_attr_passive_delay);
1664         if (result)
1665                 goto unregister;
1666
1667         /* Create polling_delay attribute */
1668         result = device_create_file(&tz->device, &dev_attr_polling_delay);
1669         if (result)
1670                 goto unregister;
1671
1672         /* Create available_policies attribute */
1673         result = device_create_file(&tz->device, &dev_attr_available_policies);
1674         if (result)
1675                 goto unregister;
1676
1677         /* Update 'this' zone's governor information */
1678         mutex_lock(&thermal_governor_lock);
1679
1680         if (tz->tzp)
1681                 tz->governor = __find_governor(tz->tzp->governor_name);
1682
1683         if (!tz->governor) {
1684                 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1685                 if (!tz->governor) {
1686                         mutex_unlock(&thermal_governor_lock);
1687                         goto unregister;
1688                 }
1689         }
1690
1691         if (tz->governor->start) {
1692                 result = tz->governor->start(tz);
1693                 if (result < 0) {
1694                         mutex_unlock(&thermal_governor_lock);
1695                         goto unregister;
1696                 }
1697         }
1698
1699         mutex_unlock(&thermal_governor_lock);
1700
1701         if (!tz->tzp || !tz->tzp->no_hwmon) {
1702                 result = thermal_add_hwmon_sysfs(tz);
1703                 if (result)
1704                         goto unregister;
1705         }
1706
1707         mutex_lock(&thermal_list_lock);
1708         list_add_tail(&tz->node, &thermal_tz_list);
1709         mutex_unlock(&thermal_list_lock);
1710
1711         /* Bind cooling devices for this zone */
1712         bind_tz(tz);
1713
1714         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1715
1716         if (!tz->ops->get_temp)
1717                 thermal_zone_device_set_polling(tz, 0);
1718
1719         thermal_zone_device_update(tz);
1720
1721         dev_info(&tz->device, "Registering thermal zone %s for type %s\n",
1722                         dev_name(&tz->device), type);
1723         if (!result)
1724                 return tz;
1725
1726 unregister:
1727         if (tz->governor && tz->governor->stop)
1728                 tz->governor->stop(tz);
1729         tz->governor = NULL;
1730         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1731         device_unregister(&tz->device);
1732         return ERR_PTR(result);
1733 }
1734 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1735
1736 /**
1737  * thermal_device_unregister - removes the registered thermal zone device
1738  * @tz: the thermal zone device to remove
1739  */
1740 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1741 {
1742         int i;
1743         const struct thermal_zone_params *tzp;
1744         struct thermal_cooling_device *cdev;
1745         struct thermal_zone_device *pos = NULL;
1746
1747         if (!tz)
1748                 return;
1749
1750         tzp = tz->tzp;
1751
1752         mutex_lock(&thermal_list_lock);
1753         list_for_each_entry(pos, &thermal_tz_list, node)
1754             if (pos == tz)
1755                 break;
1756         if (pos != tz) {
1757                 /* thermal zone device not found */
1758                 mutex_unlock(&thermal_list_lock);
1759                 return;
1760         }
1761         list_del(&tz->node);
1762
1763         /* Unbind all cdevs associated with 'this' thermal zone */
1764         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1765                 if (tz->ops->unbind) {
1766                         tz->ops->unbind(tz, cdev);
1767                         continue;
1768                 }
1769
1770                 if (!tzp || !tzp->tbp)
1771                         break;
1772
1773                 for (i = 0; i < tzp->num_tbps; i++) {
1774                         if (tzp->tbp[i].cdev == cdev) {
1775                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1776                                 tzp->tbp[i].cdev = NULL;
1777                         }
1778                 }
1779         }
1780
1781         mutex_unlock(&thermal_list_lock);
1782
1783         thermal_zone_device_set_polling(tz, 0);
1784
1785         if (tz->type[0])
1786                 device_remove_file(&tz->device, &dev_attr_type);
1787         device_remove_file(&tz->device, &dev_attr_temp);
1788         if (tz->ops->get_mode)
1789                 device_remove_file(&tz->device, &dev_attr_mode);
1790         device_remove_file(&tz->device, &dev_attr_passive_delay);
1791         device_remove_file(&tz->device, &dev_attr_polling_delay);
1792         device_remove_file(&tz->device, &dev_attr_policy);
1793         device_remove_file(&tz->device, &dev_attr_available_policies);
1794         remove_trip_attrs(tz);
1795
1796         if (tz->governor && tz->governor->stop)
1797                 tz->governor->stop(tz);
1798         tz->governor = NULL;
1799
1800         thermal_remove_hwmon_sysfs(tz);
1801         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1802         idr_destroy(&tz->idr);
1803         mutex_destroy(&tz->lock);
1804         device_unregister(&tz->device);
1805         return;
1806 }
1807 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1808
1809 /**
1810  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1811  * @name: thermal zone name to fetch the temperature
1812  *
1813  * When only one zone is found with the passed name, returns a reference to it.
1814  *
1815  * Return: On success returns a reference to an unique thermal zone with
1816  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1817  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1818  */
1819 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1820 {
1821         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1822         unsigned int found = 0;
1823
1824         if (!name)
1825                 goto exit;
1826
1827         mutex_lock(&thermal_list_lock);
1828         list_for_each_entry(pos, &thermal_tz_list, node)
1829                 if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1830                         found++;
1831                         ref = pos;
1832                 }
1833         mutex_unlock(&thermal_list_lock);
1834
1835         /* nothing has been found, thus an error code for it */
1836         if (found == 0)
1837                 ref = ERR_PTR(-ENODEV);
1838         else if (found > 1)
1839         /* Success only when an unique zone is found */
1840                 ref = ERR_PTR(-EEXIST);
1841
1842 exit:
1843         return ref;
1844 }
1845 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1846
1847 #ifdef CONFIG_NET
1848 static struct genl_family thermal_event_genl_family = {
1849         .id = GENL_ID_GENERATE,
1850         .name = THERMAL_GENL_FAMILY_NAME,
1851         .version = THERMAL_GENL_VERSION,
1852         .maxattr = THERMAL_GENL_ATTR_MAX,
1853 };
1854
1855 static struct genl_multicast_group thermal_event_mcgrp = {
1856         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1857 };
1858
1859 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1860                                    enum events event, int temp)
1861 {
1862         struct sk_buff *skb;
1863         struct nlattr *attr;
1864         struct thermal_genl_event *thermal_event;
1865         void *msg_header;
1866         int size;
1867         int result;
1868         static unsigned int thermal_event_seqnum;
1869
1870         if (!tz)
1871                 return -EINVAL;
1872
1873         /* allocate memory */
1874         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1875                nla_total_size(0);
1876
1877         skb = genlmsg_new(size, GFP_ATOMIC);
1878         if (!skb)
1879                 return -ENOMEM;
1880
1881         /* add the genetlink message header */
1882         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1883                                  &thermal_event_genl_family, 0,
1884                                  THERMAL_GENL_CMD_EVENT);
1885         if (!msg_header) {
1886                 nlmsg_free(skb);
1887                 return -ENOMEM;
1888         }
1889
1890         /* fill the data */
1891         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1892                            sizeof(struct thermal_genl_event));
1893
1894         if (!attr) {
1895                 nlmsg_free(skb);
1896                 return -EINVAL;
1897         }
1898
1899         thermal_event = nla_data(attr);
1900         if (!thermal_event) {
1901                 nlmsg_free(skb);
1902                 return -EINVAL;
1903         }
1904
1905         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1906
1907         thermal_event->orig = tz->id;
1908         thermal_event->event = event;
1909         thermal_event->temp = temp;
1910
1911         /* send multicast genetlink message */
1912         result = genlmsg_end(skb, msg_header);
1913         if (result < 0) {
1914                 nlmsg_free(skb);
1915                 return result;
1916         }
1917
1918         genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1919         return result;
1920 }
1921 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1922
1923 static int genetlink_init(void)
1924 {
1925         int result;
1926
1927         result = genl_register_family(&thermal_event_genl_family);
1928         if (result)
1929                 return result;
1930
1931         result = genl_register_mc_group(&thermal_event_genl_family,
1932                                         &thermal_event_mcgrp);
1933         if (result)
1934                 genl_unregister_family(&thermal_event_genl_family);
1935         return result;
1936 }
1937
1938 static void genetlink_exit(void)
1939 {
1940         genl_unregister_family(&thermal_event_genl_family);
1941 }
1942 #else /* !CONFIG_NET */
1943 static inline int genetlink_init(void) { return 0; }
1944 static inline void genetlink_exit(void) {}
1945 #endif /* !CONFIG_NET */
1946
1947 static int __init thermal_register_governors(void)
1948 {
1949         int result;
1950
1951         result = thermal_gov_step_wise_register();
1952         if (result)
1953                 return result;
1954
1955         result = thermal_gov_fair_share_register();
1956         if (result)
1957                 return result;
1958
1959         result = pid_thermal_gov_register();
1960         if (result)
1961                 return result;
1962
1963         return thermal_gov_user_space_register();
1964 }
1965
1966 static void thermal_unregister_governors(void)
1967 {
1968         thermal_gov_step_wise_unregister();
1969         thermal_gov_fair_share_unregister();
1970         pid_thermal_gov_unregister();
1971         thermal_gov_user_space_unregister();
1972 }
1973
1974 static int __init thermal_init(void)
1975 {
1976         int result;
1977
1978         result = thermal_register_governors();
1979         if (result)
1980                 goto error;
1981
1982         result = class_register(&thermal_class);
1983         if (result)
1984                 goto unregister_governors;
1985
1986         result = genetlink_init();
1987         if (result)
1988                 goto unregister_class;
1989
1990         result = of_parse_thermal_zones();
1991         if (result)
1992                 goto exit_netlink;
1993
1994         return 0;
1995
1996 exit_netlink:
1997         genetlink_exit();
1998 unregister_governors:
1999         thermal_unregister_governors();
2000 unregister_class:
2001         class_unregister(&thermal_class);
2002 error:
2003         idr_destroy(&thermal_tz_idr);
2004         idr_destroy(&thermal_cdev_idr);
2005         mutex_destroy(&thermal_idr_lock);
2006         mutex_destroy(&thermal_list_lock);
2007         mutex_destroy(&thermal_governor_lock);
2008         return result;
2009 }
2010
2011 static void __exit thermal_exit(void)
2012 {
2013         of_thermal_destroy_zones();
2014         genetlink_exit();
2015         class_unregister(&thermal_class);
2016         thermal_unregister_governors();
2017         idr_destroy(&thermal_tz_idr);
2018         idr_destroy(&thermal_cdev_idr);
2019         mutex_destroy(&thermal_idr_lock);
2020         mutex_destroy(&thermal_list_lock);
2021         mutex_destroy(&thermal_governor_lock);
2022 }
2023
2024 fs_initcall(thermal_init);
2025 module_exit(thermal_exit);