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