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