drivers/thermal/thermal_sys.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 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <linux/err.h>
  29 #include <linux/slab.h>
  30 #include <linux/kdev_t.h>
  31 #include <linux/idr.h>
  32 #include <linux/thermal.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/reboot.h>
  35 #include <net/netlink.h>
  36 #include <net/genetlink.h>
  37
  38 MODULE_AUTHOR("Zhang Rui");
  39 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  40 MODULE_LICENSE("GPL");
  41
  42 #define PREFIX "Thermal: "
  43
  44 struct thermal_cooling_device_instance {
  45         int id;
  46         char name[THERMAL_NAME_LENGTH];
  47         struct thermal_zone_device *tz;
  48         struct thermal_cooling_device *cdev;
  49         int trip;
  50         char attr_name[THERMAL_NAME_LENGTH];
  51         struct device_attribute attr;
  52         struct list_head node;
  53 };
  54
  55 static DEFINE_IDR(thermal_tz_idr);
  56 static DEFINE_IDR(thermal_cdev_idr);
  57 static DEFINE_MUTEX(thermal_idr_lock);
  58
  59 static LIST_HEAD(thermal_tz_list);
  60 static LIST_HEAD(thermal_cdev_list);
  61 static DEFINE_MUTEX(thermal_list_lock);
  62
  63 static unsigned int thermal_event_seqnum;
  64
  65 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  66 {
  67         int err;
  68
  69       again:
  70         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  71                 return -ENOMEM;
  72
  73         if (lock)
  74                 mutex_lock(lock);
  75         err = idr_get_new(idr, NULL, id);
  76         if (lock)
  77                 mutex_unlock(lock);
  78         if (unlikely(err == -EAGAIN))
  79                 goto again;
  80         else if (unlikely(err))
  81                 return err;
  82
  83         *id = *id & MAX_ID_MASK;
  84         return 0;
  85 }
  86
  87 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  88 {
  89         if (lock)
  90                 mutex_lock(lock);
  91         idr_remove(idr, id);
  92         if (lock)
  93                 mutex_unlock(lock);
  94 }
  95
  96 /* sys I/F for thermal zone */
  97
  98 #define to_thermal_zone(_dev) \
  99         container_of(_dev, struct thermal_zone_device, device)
 100
 101 static ssize_t
 102 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 103 {
 104         struct thermal_zone_device *tz = to_thermal_zone(dev);
 105
 106         return sprintf(buf, "%s\n", tz->type);
 107 }
 108
 109 static ssize_t
 110 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 111 {
 112         struct thermal_zone_device *tz = to_thermal_zone(dev);
 113         long temperature;
 114         int ret;
 115
 116         if (!tz->ops->get_temp)
 117                 return -EPERM;
 118
 119         ret = tz->ops->get_temp(tz, &temperature);
 120
 121         if (ret)
 122                 return ret;
 123
 124         return sprintf(buf, "%ld\n", temperature);
 125 }
 126
 127 static ssize_t
 128 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 129 {
 130         struct thermal_zone_device *tz = to_thermal_zone(dev);
 131         enum thermal_device_mode mode;
 132         int result;
 133
 134         if (!tz->ops->get_mode)
 135                 return -EPERM;
 136
 137         result = tz->ops->get_mode(tz, &mode);
 138         if (result)
 139                 return result;
 140
 141         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 142                        : "disabled");
 143 }
 144
 145 static ssize_t
 146 mode_store(struct device *dev, struct device_attribute *attr,
 147            const char *buf, size_t count)
 148 {
 149         struct thermal_zone_device *tz = to_thermal_zone(dev);
 150         int result;
 151
 152         if (!tz->ops->set_mode)
 153                 return -EPERM;
 154
 155         if (!strncmp(buf, "enabled", sizeof("enabled")))
 156                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 157         else if (!strncmp(buf, "disabled", sizeof("disabled")))
 158                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 159         else
 160                 result = -EINVAL;
 161
 162         if (result)
 163                 return result;
 164
 165         return count;
 166 }
 167
 168 static ssize_t
 169 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 170                      char *buf)
 171 {
 172         struct thermal_zone_device *tz = to_thermal_zone(dev);
 173         enum thermal_trip_type type;
 174         int trip, result;
 175
 176         if (!tz->ops->get_trip_type)
 177                 return -EPERM;
 178
 179         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 180                 return -EINVAL;
 181
 182         result = tz->ops->get_trip_type(tz, trip, &type);
 183         if (result)
 184                 return result;
 185
 186         switch (type) {
 187         case THERMAL_TRIP_CRITICAL:
 188                 return sprintf(buf, "critical\n");
 189         case THERMAL_TRIP_HOT:
 190                 return sprintf(buf, "hot\n");
 191         case THERMAL_TRIP_PASSIVE:
 192                 return sprintf(buf, "passive\n");
 193         case THERMAL_TRIP_ACTIVE:
 194                 return sprintf(buf, "active\n");
 195         default:
 196                 return sprintf(buf, "unknown\n");
 197         }
 198 }
 199
 200 static ssize_t
 201 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 202                      char *buf)
 203 {
 204         struct thermal_zone_device *tz = to_thermal_zone(dev);
 205         int trip, ret;
 206         long temperature;
 207
 208         if (!tz->ops->get_trip_temp)
 209                 return -EPERM;
 210
 211         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 212                 return -EINVAL;
 213
 214         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 215
 216         if (ret)
 217                 return ret;
 218
 219         return sprintf(buf, "%ld\n", temperature);
 220 }
 221
 222 static ssize_t
 223 passive_store(struct device *dev, struct device_attribute *attr,
 224                     const char *buf, size_t count)
 225 {
 226         struct thermal_zone_device *tz = to_thermal_zone(dev);
 227         struct thermal_cooling_device *cdev = NULL;
 228         int state;
 229
 230         if (!sscanf(buf, "%d\n", &state))
 231                 return -EINVAL;
 232
 233         /* sanity check: values below 1000 millicelcius don't make sense
 234          * and can cause the system to go into a thermal heart attack
 235          */
 236         if (state && state < 1000)
 237                 return -EINVAL;
 238
 239         if (state && !tz->forced_passive) {
 240                 mutex_lock(&thermal_list_lock);
 241                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 242                         if (!strncmp("Processor", cdev->type,
 243                                      sizeof("Processor")))
 244                                 thermal_zone_bind_cooling_device(tz,
 245                                                                  THERMAL_TRIPS_NONE,
 246                                                                  cdev);
 247                 }
 248                 mutex_unlock(&thermal_list_lock);
 249                 if (!tz->passive_delay)
 250                         tz->passive_delay = 1000;
 251         } else if (!state && tz->forced_passive) {
 252                 mutex_lock(&thermal_list_lock);
 253                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 254                         if (!strncmp("Processor", cdev->type,
 255                                      sizeof("Processor")))
 256                                 thermal_zone_unbind_cooling_device(tz,
 257                                                                    THERMAL_TRIPS_NONE,
 258                                                                    cdev);
 259                 }
 260                 mutex_unlock(&thermal_list_lock);
 261                 tz->passive_delay = 0;
 262         }
 263
 264         tz->tc1 = 1;
 265         tz->tc2 = 1;
 266
 267         tz->forced_passive = state;
 268
 269         thermal_zone_device_update(tz);
 270
 271         return count;
 272 }
 273
 274 static ssize_t
 275 passive_show(struct device *dev, struct device_attribute *attr,
 276                    char *buf)
 277 {
 278         struct thermal_zone_device *tz = to_thermal_zone(dev);
 279
 280         return sprintf(buf, "%d\n", tz->forced_passive);
 281 }
 282
 283 static DEVICE_ATTR(type, 0444, type_show, NULL);
 284 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 285 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 286 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
 287                    passive_store);
 288
 289 static struct device_attribute trip_point_attrs[] = {
 290         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 291         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 292         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 293         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 294         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 295         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 296         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 297         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 298         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 299         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 300         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 301         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 302         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 303         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 304         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 305         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 306         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 307         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 308         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 309         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 310         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
 311         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
 312         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
 313         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
 314 };
 315
 316 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 317 do {    \
 318         result = device_create_file(_dev,       \
 319                                 &trip_point_attrs[_index * 2]); \
 320         if (result)     \
 321                 break;  \
 322         result = device_create_file(_dev,       \
 323                         &trip_point_attrs[_index * 2 + 1]);     \
 324 } while (0)
 325
 326 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 327 do {    \
 328         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 329         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 330 } while (0)
 331
 332 /* sys I/F for cooling device */
 333 #define to_cooling_device(_dev) \
 334         container_of(_dev, struct thermal_cooling_device, device)
 335
 336 static ssize_t
 337 thermal_cooling_device_type_show(struct device *dev,
 338                                  struct device_attribute *attr, char *buf)
 339 {
 340         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 341
 342         return sprintf(buf, "%s\n", cdev->type);
 343 }
 344
 345 static ssize_t
 346 thermal_cooling_device_max_state_show(struct device *dev,
 347                                       struct device_attribute *attr, char *buf)
 348 {
 349         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 350         unsigned long state;
 351         int ret;
 352
 353         ret = cdev->ops->get_max_state(cdev, &state);
 354         if (ret)
 355                 return ret;
 356         return sprintf(buf, "%ld\n", state);
 357 }
 358
 359 static ssize_t
 360 thermal_cooling_device_cur_state_show(struct device *dev,
 361                                       struct device_attribute *attr, char *buf)
 362 {
 363         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 364         unsigned long state;
 365         int ret;
 366
 367         ret = cdev->ops->get_cur_state(cdev, &state);
 368         if (ret)
 369                 return ret;
 370         return sprintf(buf, "%ld\n", state);
 371 }
 372
 373 static ssize_t
 374 thermal_cooling_device_cur_state_store(struct device *dev,
 375                                        struct device_attribute *attr,
 376                                        const char *buf, size_t count)
 377 {
 378         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 379         unsigned long state;
 380         int result;
 381
 382         if (!sscanf(buf, "%ld\n", &state))
 383                 return -EINVAL;
 384
 385         if ((long)state < 0)
 386                 return -EINVAL;
 387
 388         result = cdev->ops->set_cur_state(cdev, state);
 389         if (result)
 390                 return result;
 391         return count;
 392 }
 393
 394 static struct device_attribute dev_attr_cdev_type =
 395 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 396 static DEVICE_ATTR(max_state, 0444,
 397                    thermal_cooling_device_max_state_show, NULL);
 398 static DEVICE_ATTR(cur_state, 0644,
 399                    thermal_cooling_device_cur_state_show,
 400                    thermal_cooling_device_cur_state_store);
 401
 402 static ssize_t
 403 thermal_cooling_device_trip_point_show(struct device *dev,
 404                                        struct device_attribute *attr, char *buf)
 405 {
 406         struct thermal_cooling_device_instance *instance;
 407
 408         instance =
 409             container_of(attr, struct thermal_cooling_device_instance, attr);
 410
 411         if (instance->trip == THERMAL_TRIPS_NONE)
 412                 return sprintf(buf, "-1\n");
 413         else
 414                 return sprintf(buf, "%d\n", instance->trip);
 415 }
 416
 417 /* Device management */
 418
 419 #if defined(CONFIG_THERMAL_HWMON)
 420
 421 /* hwmon sys I/F */
 422 #include <linux/hwmon.h>
 423 static LIST_HEAD(thermal_hwmon_list);
 424
 425 static ssize_t
 426 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 427 {
 428         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 429         return sprintf(buf, "%s\n", hwmon->type);
 430 }
 431 static DEVICE_ATTR(name, 0444, name_show, NULL);
 432
 433 static ssize_t
 434 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 435 {
 436         long temperature;
 437         int ret;
 438         struct thermal_hwmon_attr *hwmon_attr
 439                         = container_of(attr, struct thermal_hwmon_attr, attr);
 440         struct thermal_zone_device *tz
 441                         = container_of(hwmon_attr, struct thermal_zone_device,
 442                                        temp_input);
 443
 444         ret = tz->ops->get_temp(tz, &temperature);
 445
 446         if (ret)
 447                 return ret;
 448
 449         return sprintf(buf, "%ld\n", temperature);
 450 }
 451
 452 static ssize_t
 453 temp_crit_show(struct device *dev, struct device_attribute *attr,
 454                 char *buf)
 455 {
 456         struct thermal_hwmon_attr *hwmon_attr
 457                         = container_of(attr, struct thermal_hwmon_attr, attr);
 458         struct thermal_zone_device *tz
 459                         = container_of(hwmon_attr, struct thermal_zone_device,
 460                                        temp_crit);
 461         long temperature;
 462         int ret;
 463
 464         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 465         if (ret)
 466                 return ret;
 467
 468         return sprintf(buf, "%ld\n", temperature);
 469 }
 470
 471
 472 static int
 473 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 474 {
 475         struct thermal_hwmon_device *hwmon;
 476         int new_hwmon_device = 1;
 477         int result;
 478
 479         mutex_lock(&thermal_list_lock);
 480         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 481                 if (!strcmp(hwmon->type, tz->type)) {
 482                         new_hwmon_device = 0;
 483                         mutex_unlock(&thermal_list_lock);
 484                         goto register_sys_interface;
 485                 }
 486         mutex_unlock(&thermal_list_lock);
 487
 488         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 489         if (!hwmon)
 490                 return -ENOMEM;
 491
 492         INIT_LIST_HEAD(&hwmon->tz_list);
 493         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 494         hwmon->device = hwmon_device_register(NULL);
 495         if (IS_ERR(hwmon->device)) {
 496                 result = PTR_ERR(hwmon->device);
 497                 goto free_mem;
 498         }
 499         dev_set_drvdata(hwmon->device, hwmon);
 500         result = device_create_file(hwmon->device, &dev_attr_name);
 501         if (result)
 502                 goto free_mem;
 503
 504  register_sys_interface:
 505         tz->hwmon = hwmon;
 506         hwmon->count++;
 507
 508         snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
 509                  "temp%d_input", hwmon->count);
 510         tz->temp_input.attr.attr.name = tz->temp_input.name;
 511         tz->temp_input.attr.attr.mode = 0444;
 512         tz->temp_input.attr.show = temp_input_show;
 513         sysfs_attr_init(&tz->temp_input.attr.attr);
 514         result = device_create_file(hwmon->device, &tz->temp_input.attr);
 515         if (result)
 516                 goto unregister_name;
 517
 518         if (tz->ops->get_crit_temp) {
 519                 unsigned long temperature;
 520                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 521                         snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
 522                                 "temp%d_crit", hwmon->count);
 523                         tz->temp_crit.attr.attr.name = tz->temp_crit.name;
 524                         tz->temp_crit.attr.attr.mode = 0444;
 525                         tz->temp_crit.attr.show = temp_crit_show;
 526                         sysfs_attr_init(&tz->temp_crit.attr.attr);
 527                         result = device_create_file(hwmon->device,
 528                                                     &tz->temp_crit.attr);
 529                         if (result)
 530                                 goto unregister_input;
 531                 }
 532         }
 533
 534         mutex_lock(&thermal_list_lock);
 535         if (new_hwmon_device)
 536                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 537         list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
 538         mutex_unlock(&thermal_list_lock);
 539
 540         return 0;
 541
 542  unregister_input:
 543         device_remove_file(hwmon->device, &tz->temp_input.attr);
 544  unregister_name:
 545         if (new_hwmon_device) {
 546                 device_remove_file(hwmon->device, &dev_attr_name);
 547                 hwmon_device_unregister(hwmon->device);
 548         }
 549  free_mem:
 550         if (new_hwmon_device)
 551                 kfree(hwmon);
 552
 553         return result;
 554 }
 555
 556 static void
 557 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 558 {
 559         struct thermal_hwmon_device *hwmon = tz->hwmon;
 560
 561         tz->hwmon = NULL;
 562         device_remove_file(hwmon->device, &tz->temp_input.attr);
 563         if (tz->ops->get_crit_temp)
 564                 device_remove_file(hwmon->device, &tz->temp_crit.attr);
 565
 566         mutex_lock(&thermal_list_lock);
 567         list_del(&tz->hwmon_node);
 568         if (!list_empty(&hwmon->tz_list)) {
 569                 mutex_unlock(&thermal_list_lock);
 570                 return;
 571         }
 572         list_del(&hwmon->node);
 573         mutex_unlock(&thermal_list_lock);
 574
 575         device_remove_file(hwmon->device, &dev_attr_name);
 576         hwmon_device_unregister(hwmon->device);
 577         kfree(hwmon);
 578 }
 579 #else
 580 static int
 581 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 582 {
 583         return 0;
 584 }
 585
 586 static void
 587 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 588 {
 589 }
 590 #endif
 591
 592 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 593                                             int delay)
 594 {
 595         cancel_delayed_work(&(tz->poll_queue));
 596
 597         if (!delay)
 598                 return;
 599
 600         if (delay > 1000)
 601                 schedule_delayed_work(&(tz->poll_queue),
 602                                       round_jiffies(msecs_to_jiffies(delay)));
 603         else
 604                 schedule_delayed_work(&(tz->poll_queue),
 605                                       msecs_to_jiffies(delay));
 606 }
 607
 608 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 609                                         int temp, int trip_temp, int trip)
 610 {
 611         int trend = 0;
 612         struct thermal_cooling_device_instance *instance;
 613         struct thermal_cooling_device *cdev;
 614         long state, max_state;
 615
 616         /*
 617          * Above Trip?
 618          * -----------
 619          * Calculate the thermal trend (using the passive cooling equation)
 620          * and modify the performance limit for all passive cooling devices
 621          * accordingly.  Note that we assume symmetry.
 622          */
 623         if (temp >= trip_temp) {
 624                 tz->passive = true;
 625
 626                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 627                         (tz->tc2 * (temp - trip_temp));
 628
 629                 /* Heating up? */
 630                 if (trend > 0) {
 631                         list_for_each_entry(instance, &tz->cooling_devices,
 632                                             node) {
 633                                 if (instance->trip != trip)
 634                                         continue;
 635                                 cdev = instance->cdev;
 636                                 cdev->ops->get_cur_state(cdev, &state);
 637                                 cdev->ops->get_max_state(cdev, &max_state);
 638                                 if (state++ < max_state)
 639                                         cdev->ops->set_cur_state(cdev, state);
 640                         }
 641                 } else if (trend < 0) { /* Cooling off? */
 642                         list_for_each_entry(instance, &tz->cooling_devices,
 643                                             node) {
 644                                 if (instance->trip != trip)
 645                                         continue;
 646                                 cdev = instance->cdev;
 647                                 cdev->ops->get_cur_state(cdev, &state);
 648                                 cdev->ops->get_max_state(cdev, &max_state);
 649                                 if (state > 0)
 650                                         cdev->ops->set_cur_state(cdev, --state);
 651                         }
 652                 }
 653                 return;
 654         }
 655
 656         /*
 657          * Below Trip?
 658          * -----------
 659          * Implement passive cooling hysteresis to slowly increase performance
 660          * and avoid thrashing around the passive trip point.  Note that we
 661          * assume symmetry.
 662          */
 663         list_for_each_entry(instance, &tz->cooling_devices, node) {
 664                 if (instance->trip != trip)
 665                         continue;
 666                 cdev = instance->cdev;
 667                 cdev->ops->get_cur_state(cdev, &state);
 668                 cdev->ops->get_max_state(cdev, &max_state);
 669                 if (state > 0)
 670                         cdev->ops->set_cur_state(cdev, --state);
 671                 if (state == 0)
 672                         tz->passive = false;
 673         }
 674 }
 675
 676 static void thermal_zone_device_check(struct work_struct *work)
 677 {
 678         struct thermal_zone_device *tz = container_of(work, struct
 679                                                       thermal_zone_device,
 680                                                       poll_queue.work);
 681         thermal_zone_device_update(tz);
 682 }
 683
 684 /**
 685  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 686  * @tz:         thermal zone device
 687  * @trip:       indicates which trip point the cooling devices is
 688  *              associated with in this thermal zone.
 689  * @cdev:       thermal cooling device
 690  *
 691  * This function is usually called in the thermal zone device .bind callback.
 692  */
 693 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 694                                      int trip,
 695                                      struct thermal_cooling_device *cdev)
 696 {
 697         struct thermal_cooling_device_instance *dev;
 698         struct thermal_cooling_device_instance *pos;
 699         struct thermal_zone_device *pos1;
 700         struct thermal_cooling_device *pos2;
 701         int result;
 702
 703         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 704                 return -EINVAL;
 705
 706         list_for_each_entry(pos1, &thermal_tz_list, node) {
 707                 if (pos1 == tz)
 708                         break;
 709         }
 710         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 711                 if (pos2 == cdev)
 712                         break;
 713         }
 714
 715         if (tz != pos1 || cdev != pos2)
 716                 return -EINVAL;
 717
 718         dev =
 719             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 720         if (!dev)
 721                 return -ENOMEM;
 722         dev->tz = tz;
 723         dev->cdev = cdev;
 724         dev->trip = trip;
 725         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 726         if (result)
 727                 goto free_mem;
 728
 729         sprintf(dev->name, "cdev%d", dev->id);
 730         result =
 731             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 732         if (result)
 733                 goto release_idr;
 734
 735         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 736         sysfs_attr_init(&dev->attr.attr);
 737         dev->attr.attr.name = dev->attr_name;
 738         dev->attr.attr.mode = 0444;
 739         dev->attr.show = thermal_cooling_device_trip_point_show;
 740         result = device_create_file(&tz->device, &dev->attr);
 741         if (result)
 742                 goto remove_symbol_link;
 743
 744         mutex_lock(&tz->lock);
 745         list_for_each_entry(pos, &tz->cooling_devices, node)
 746             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 747                 result = -EEXIST;
 748                 break;
 749         }
 750         if (!result)
 751                 list_add_tail(&dev->node, &tz->cooling_devices);
 752         mutex_unlock(&tz->lock);
 753
 754         if (!result)
 755                 return 0;
 756
 757         device_remove_file(&tz->device, &dev->attr);
 758       remove_symbol_link:
 759         sysfs_remove_link(&tz->device.kobj, dev->name);
 760       release_idr:
 761         release_idr(&tz->idr, &tz->lock, dev->id);
 762       free_mem:
 763         kfree(dev);
 764         return result;
 765 }
 766
 767 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 768
 769 /**
 770  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 771  * @tz:         thermal zone device
 772  * @trip:       indicates which trip point the cooling devices is
 773  *              associated with in this thermal zone.
 774  * @cdev:       thermal cooling device
 775  *
 776  * This function is usually called in the thermal zone device .unbind callback.
 777  */
 778 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 779                                        int trip,
 780                                        struct thermal_cooling_device *cdev)
 781 {
 782         struct thermal_cooling_device_instance *pos, *next;
 783
 784         mutex_lock(&tz->lock);
 785         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 786                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 787                         list_del(&pos->node);
 788                         mutex_unlock(&tz->lock);
 789                         goto unbind;
 790                 }
 791         }
 792         mutex_unlock(&tz->lock);
 793
 794         return -ENODEV;
 795
 796       unbind:
 797         device_remove_file(&tz->device, &pos->attr);
 798         sysfs_remove_link(&tz->device.kobj, pos->name);
 799         release_idr(&tz->idr, &tz->lock, pos->id);
 800         kfree(pos);
 801         return 0;
 802 }
 803
 804 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 805
 806 static void thermal_release(struct device *dev)
 807 {
 808         struct thermal_zone_device *tz;
 809         struct thermal_cooling_device *cdev;
 810
 811         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
 812                 tz = to_thermal_zone(dev);
 813                 kfree(tz);
 814         } else {
 815                 cdev = to_cooling_device(dev);
 816                 kfree(cdev);
 817         }
 818 }
 819
 820 static struct class thermal_class = {
 821         .name = "thermal",
 822         .dev_release = thermal_release,
 823 };
 824
 825 /**
 826  * thermal_cooling_device_register - register a new thermal cooling device
 827  * @type:       the thermal cooling device type.
 828  * @devdata:    device private data.
 829  * @ops:                standard thermal cooling devices callbacks.
 830  */
 831 struct thermal_cooling_device *thermal_cooling_device_register(
 832      char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 833 {
 834         struct thermal_cooling_device *cdev;
 835         struct thermal_zone_device *pos;
 836         int result;
 837
 838         if (strlen(type) >= THERMAL_NAME_LENGTH)
 839                 return ERR_PTR(-EINVAL);
 840
 841         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 842             !ops->set_cur_state)
 843                 return ERR_PTR(-EINVAL);
 844
 845         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 846         if (!cdev)
 847                 return ERR_PTR(-ENOMEM);
 848
 849         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 850         if (result) {
 851                 kfree(cdev);
 852                 return ERR_PTR(result);
 853         }
 854
 855         strcpy(cdev->type, type);
 856         cdev->ops = ops;
 857         cdev->device.class = &thermal_class;
 858         cdev->devdata = devdata;
 859         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 860         result = device_register(&cdev->device);
 861         if (result) {
 862                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 863                 kfree(cdev);
 864                 return ERR_PTR(result);
 865         }
 866
 867         /* sys I/F */
 868         if (type) {
 869                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 870                 if (result)
 871                         goto unregister;
 872         }
 873
 874         result = device_create_file(&cdev->device, &dev_attr_max_state);
 875         if (result)
 876                 goto unregister;
 877
 878         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 879         if (result)
 880                 goto unregister;
 881
 882         mutex_lock(&thermal_list_lock);
 883         list_add(&cdev->node, &thermal_cdev_list);
 884         list_for_each_entry(pos, &thermal_tz_list, node) {
 885                 if (!pos->ops->bind)
 886                         continue;
 887                 result = pos->ops->bind(pos, cdev);
 888                 if (result)
 889                         break;
 890
 891         }
 892         mutex_unlock(&thermal_list_lock);
 893
 894         if (!result)
 895                 return cdev;
 896
 897       unregister:
 898         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 899         device_unregister(&cdev->device);
 900         return ERR_PTR(result);
 901 }
 902
 903 EXPORT_SYMBOL(thermal_cooling_device_register);
 904
 905 /**
 906  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 907  * @cdev:       the thermal cooling device to remove.
 908  *
 909  * thermal_cooling_device_unregister() must be called when the device is no
 910  * longer needed.
 911  */
 912 void thermal_cooling_device_unregister(struct
 913                                        thermal_cooling_device
 914                                        *cdev)
 915 {
 916         struct thermal_zone_device *tz;
 917         struct thermal_cooling_device *pos = NULL;
 918
 919         if (!cdev)
 920                 return;
 921
 922         mutex_lock(&thermal_list_lock);
 923         list_for_each_entry(pos, &thermal_cdev_list, node)
 924             if (pos == cdev)
 925                 break;
 926         if (pos != cdev) {
 927                 /* thermal cooling device not found */
 928                 mutex_unlock(&thermal_list_lock);
 929                 return;
 930         }
 931         list_del(&cdev->node);
 932         list_for_each_entry(tz, &thermal_tz_list, node) {
 933                 if (!tz->ops->unbind)
 934                         continue;
 935                 tz->ops->unbind(tz, cdev);
 936         }
 937         mutex_unlock(&thermal_list_lock);
 938         if (cdev->type[0])
 939                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
 940         device_remove_file(&cdev->device, &dev_attr_max_state);
 941         device_remove_file(&cdev->device, &dev_attr_cur_state);
 942
 943         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 944         device_unregister(&cdev->device);
 945         return;
 946 }
 947
 948 EXPORT_SYMBOL(thermal_cooling_device_unregister);
 949
 950 /**
 951  * thermal_zone_device_update - force an update of a thermal zone's state
 952  * @ttz:        the thermal zone to update
 953  */
 954
 955 void thermal_zone_device_update(struct thermal_zone_device *tz)
 956 {
 957         int count, ret = 0;
 958         long temp, trip_temp;
 959         enum thermal_trip_type trip_type;
 960         struct thermal_cooling_device_instance *instance;
 961         struct thermal_cooling_device *cdev;
 962
 963         mutex_lock(&tz->lock);
 964
 965         if (tz->ops->get_temp(tz, &temp)) {
 966                 /* get_temp failed - retry it later */
 967                 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
 968                        "%d\n", tz->id);
 969                 goto leave;
 970         }
 971
 972         for (count = 0; count < tz->trips; count++) {
 973                 tz->ops->get_trip_type(tz, count, &trip_type);
 974                 tz->ops->get_trip_temp(tz, count, &trip_temp);
 975
 976                 switch (trip_type) {
 977                 case THERMAL_TRIP_CRITICAL:
 978                         if (temp >= trip_temp) {
 979                                 if (tz->ops->notify)
 980                                         ret = tz->ops->notify(tz, count,
 981                                                               trip_type);
 982                                 if (!ret) {
 983                                         printk(KERN_EMERG
 984                                                "Critical temperature reached (%ld C), shutting down.\n",
 985                                                temp/1000);
 986                                         orderly_poweroff(true);
 987                                 }
 988                         }
 989                         break;
 990                 case THERMAL_TRIP_HOT:
 991                         if (temp >= trip_temp)
 992                                 if (tz->ops->notify)
 993                                         tz->ops->notify(tz, count, trip_type);
 994                         break;
 995                 case THERMAL_TRIP_ACTIVE:
 996                         list_for_each_entry(instance, &tz->cooling_devices,
 997                                             node) {
 998                                 if (instance->trip != count)
 999                                         continue;
1000
1001                                 cdev = instance->cdev;
1002
1003                                 if (temp >= trip_temp)
1004                                         cdev->ops->set_cur_state(cdev, 1);
1005                                 else
1006                                         cdev->ops->set_cur_state(cdev, 0);
1007                         }
1008                         break;
1009                 case THERMAL_TRIP_PASSIVE:
1010                         if (temp >= trip_temp || tz->passive)
1011                                 thermal_zone_device_passive(tz, temp,
1012                                                             trip_temp, count);
1013                         break;
1014                 }
1015         }
1016
1017         if (tz->forced_passive)
1018                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1019                                             THERMAL_TRIPS_NONE);
1020
1021         tz->last_temperature = temp;
1022
1023       leave:
1024         if (tz->passive)
1025                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1026         else if (tz->polling_delay)
1027                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1028         else
1029                 thermal_zone_device_set_polling(tz, 0);
1030         mutex_unlock(&tz->lock);
1031 }
1032 EXPORT_SYMBOL(thermal_zone_device_update);
1033
1034 /**
1035  * thermal_zone_device_register - register a new thermal zone device
1036  * @type:       the thermal zone device type
1037  * @trips:      the number of trip points the thermal zone support
1038  * @devdata:    private device data
1039  * @ops:        standard thermal zone device callbacks
1040  * @tc1:        thermal coefficient 1 for passive calculations
1041  * @tc2:        thermal coefficient 2 for passive calculations
1042  * @passive_delay: number of milliseconds to wait between polls when
1043  *                 performing passive cooling
1044  * @polling_delay: number of milliseconds to wait between polls when checking
1045  *                 whether trip points have been crossed (0 for interrupt
1046  *                 driven systems)
1047  *
1048  * thermal_zone_device_unregister() must be called when the device is no
1049  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1050  * section 11.1.5.1 of the ACPI specification 3.0.
1051  */
1052 struct thermal_zone_device *thermal_zone_device_register(char *type,
1053         int trips, void *devdata,
1054         const struct thermal_zone_device_ops *ops,
1055         int tc1, int tc2, int passive_delay, int polling_delay)
1056 {
1057         struct thermal_zone_device *tz;
1058         struct thermal_cooling_device *pos;
1059         enum thermal_trip_type trip_type;
1060         int result;
1061         int count;
1062         int passive = 0;
1063
1064         if (strlen(type) >= THERMAL_NAME_LENGTH)
1065                 return ERR_PTR(-EINVAL);
1066
1067         if (trips > THERMAL_MAX_TRIPS || trips < 0)
1068                 return ERR_PTR(-EINVAL);
1069
1070         if (!ops || !ops->get_temp)
1071                 return ERR_PTR(-EINVAL);
1072
1073         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1074         if (!tz)
1075                 return ERR_PTR(-ENOMEM);
1076
1077         INIT_LIST_HEAD(&tz->cooling_devices);
1078         idr_init(&tz->idr);
1079         mutex_init(&tz->lock);
1080         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1081         if (result) {
1082                 kfree(tz);
1083                 return ERR_PTR(result);
1084         }
1085
1086         strcpy(tz->type, type);
1087         tz->ops = ops;
1088         tz->device.class = &thermal_class;
1089         tz->devdata = devdata;
1090         tz->trips = trips;
1091         tz->tc1 = tc1;
1092         tz->tc2 = tc2;
1093         tz->passive_delay = passive_delay;
1094         tz->polling_delay = polling_delay;
1095
1096         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1097         result = device_register(&tz->device);
1098         if (result) {
1099                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1100                 kfree(tz);
1101                 return ERR_PTR(result);
1102         }
1103
1104         /* sys I/F */
1105         if (type) {
1106                 result = device_create_file(&tz->device, &dev_attr_type);
1107                 if (result)
1108                         goto unregister;
1109         }
1110
1111         result = device_create_file(&tz->device, &dev_attr_temp);
1112         if (result)
1113                 goto unregister;
1114
1115         if (ops->get_mode) {
1116                 result = device_create_file(&tz->device, &dev_attr_mode);
1117                 if (result)
1118                         goto unregister;
1119         }
1120
1121         for (count = 0; count < trips; count++) {
1122                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1123                 if (result)
1124                         goto unregister;
1125                 tz->ops->get_trip_type(tz, count, &trip_type);
1126                 if (trip_type == THERMAL_TRIP_PASSIVE)
1127                         passive = 1;
1128         }
1129
1130         if (!passive)
1131                 result = device_create_file(&tz->device,
1132                                             &dev_attr_passive);
1133
1134         if (result)
1135                 goto unregister;
1136
1137         result = thermal_add_hwmon_sysfs(tz);
1138         if (result)
1139                 goto unregister;
1140
1141         mutex_lock(&thermal_list_lock);
1142         list_add_tail(&tz->node, &thermal_tz_list);
1143         if (ops->bind)
1144                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1145                 result = ops->bind(tz, pos);
1146                 if (result)
1147                         break;
1148                 }
1149         mutex_unlock(&thermal_list_lock);
1150
1151         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1152
1153         thermal_zone_device_update(tz);
1154
1155         if (!result)
1156                 return tz;
1157
1158       unregister:
1159         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1160         device_unregister(&tz->device);
1161         return ERR_PTR(result);
1162 }
1163
1164 EXPORT_SYMBOL(thermal_zone_device_register);
1165
1166 /**
1167  * thermal_device_unregister - removes the registered thermal zone device
1168  * @tz: the thermal zone device to remove
1169  */
1170 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1171 {
1172         struct thermal_cooling_device *cdev;
1173         struct thermal_zone_device *pos = NULL;
1174         int count;
1175
1176         if (!tz)
1177                 return;
1178
1179         mutex_lock(&thermal_list_lock);
1180         list_for_each_entry(pos, &thermal_tz_list, node)
1181             if (pos == tz)
1182                 break;
1183         if (pos != tz) {
1184                 /* thermal zone device not found */
1185                 mutex_unlock(&thermal_list_lock);
1186                 return;
1187         }
1188         list_del(&tz->node);
1189         if (tz->ops->unbind)
1190                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1191                     tz->ops->unbind(tz, cdev);
1192         mutex_unlock(&thermal_list_lock);
1193
1194         thermal_zone_device_set_polling(tz, 0);
1195
1196         if (tz->type[0])
1197                 device_remove_file(&tz->device, &dev_attr_type);
1198         device_remove_file(&tz->device, &dev_attr_temp);
1199         if (tz->ops->get_mode)
1200                 device_remove_file(&tz->device, &dev_attr_mode);
1201
1202         for (count = 0; count < tz->trips; count++)
1203                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1204
1205         thermal_remove_hwmon_sysfs(tz);
1206         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1207         idr_destroy(&tz->idr);
1208         mutex_destroy(&tz->lock);
1209         device_unregister(&tz->device);
1210         return;
1211 }
1212
1213 EXPORT_SYMBOL(thermal_zone_device_unregister);
1214
1215 #ifdef CONFIG_NET
1216 static struct genl_family thermal_event_genl_family = {
1217         .id = GENL_ID_GENERATE,
1218         .name = THERMAL_GENL_FAMILY_NAME,
1219         .version = THERMAL_GENL_VERSION,
1220         .maxattr = THERMAL_GENL_ATTR_MAX,
1221 };
1222
1223 static struct genl_multicast_group thermal_event_mcgrp = {
1224         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1225 };
1226
1227 int generate_netlink_event(u32 orig, enum events event)
1228 {
1229         struct sk_buff *skb;
1230         struct nlattr *attr;
1231         struct thermal_genl_event *thermal_event;
1232         void *msg_header;
1233         int size;
1234         int result;
1235
1236         /* allocate memory */
1237         size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1238                                 nla_total_size(0);
1239
1240         skb = genlmsg_new(size, GFP_ATOMIC);
1241         if (!skb)
1242                 return -ENOMEM;
1243
1244         /* add the genetlink message header */
1245         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1246                                  &thermal_event_genl_family, 0,
1247                                  THERMAL_GENL_CMD_EVENT);
1248         if (!msg_header) {
1249                 nlmsg_free(skb);
1250                 return -ENOMEM;
1251         }
1252
1253         /* fill the data */
1254         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1255                         sizeof(struct thermal_genl_event));
1256
1257         if (!attr) {
1258                 nlmsg_free(skb);
1259                 return -EINVAL;
1260         }
1261
1262         thermal_event = nla_data(attr);
1263         if (!thermal_event) {
1264                 nlmsg_free(skb);
1265                 return -EINVAL;
1266         }
1267
1268         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1269
1270         thermal_event->orig = orig;
1271         thermal_event->event = event;
1272
1273         /* send multicast genetlink message */
1274         result = genlmsg_end(skb, msg_header);
1275         if (result < 0) {
1276                 nlmsg_free(skb);
1277                 return result;
1278         }
1279
1280         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1281         if (result)
1282                 printk(KERN_INFO "failed to send netlink event:%d", result);
1283
1284         return result;
1285 }
1286 EXPORT_SYMBOL(generate_netlink_event);
1287
1288 static int genetlink_init(void)
1289 {
1290         int result;
1291
1292         result = genl_register_family(&thermal_event_genl_family);
1293         if (result)
1294                 return result;
1295
1296         result = genl_register_mc_group(&thermal_event_genl_family,
1297                                         &thermal_event_mcgrp);
1298         if (result)
1299                 genl_unregister_family(&thermal_event_genl_family);
1300         return result;
1301 }
1302
1303 static void genetlink_exit(void)
1304 {
1305         genl_unregister_family(&thermal_event_genl_family);
1306 }
1307 #else /* !CONFIG_NET */
1308 static inline int genetlink_init(void) { return 0; }
1309 static inline void genetlink_exit(void) {}
1310 #endif /* !CONFIG_NET */
1311
1312 static int __init thermal_init(void)
1313 {
1314         int result = 0;
1315
1316         result = class_register(&thermal_class);
1317         if (result) {
1318                 idr_destroy(&thermal_tz_idr);
1319                 idr_destroy(&thermal_cdev_idr);
1320                 mutex_destroy(&thermal_idr_lock);
1321                 mutex_destroy(&thermal_list_lock);
1322         }
1323         result = genetlink_init();
1324         return result;
1325 }
1326
1327 static void __exit thermal_exit(void)
1328 {
1329         class_unregister(&thermal_class);
1330         idr_destroy(&thermal_tz_idr);
1331         idr_destroy(&thermal_cdev_idr);
1332         mutex_destroy(&thermal_idr_lock);
1333         mutex_destroy(&thermal_list_lock);
1334         genetlink_exit();
1335 }
1336
1337 fs_initcall(thermal_init);
1338 module_exit(thermal_exit);