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 struct genl_family thermal_event_genl_family = {
  66         .id = GENL_ID_GENERATE,
  67         .name = THERMAL_GENL_FAMILY_NAME,
  68         .version = THERMAL_GENL_VERSION,
  69         .maxattr = THERMAL_GENL_ATTR_MAX,
  70 };
  71
  72 static struct genl_multicast_group thermal_event_mcgrp = {
  73         .name = THERMAL_GENL_MCAST_GROUP_NAME,
  74 };
  75
  76 static int genetlink_init(void);
  77 static void genetlink_exit(void);
  78
  79 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  80 {
  81         int err;
  82
  83       again:
  84         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  85                 return -ENOMEM;
  86
  87         if (lock)
  88                 mutex_lock(lock);
  89         err = idr_get_new(idr, NULL, id);
  90         if (lock)
  91                 mutex_unlock(lock);
  92         if (unlikely(err == -EAGAIN))
  93                 goto again;
  94         else if (unlikely(err))
  95                 return err;
  96
  97         *id = *id & MAX_ID_MASK;
  98         return 0;
  99 }
 100
 101 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 102 {
 103         if (lock)
 104                 mutex_lock(lock);
 105         idr_remove(idr, id);
 106         if (lock)
 107                 mutex_unlock(lock);
 108 }
 109
 110 /* sys I/F for thermal zone */
 111
 112 #define to_thermal_zone(_dev) \
 113         container_of(_dev, struct thermal_zone_device, device)
 114
 115 static ssize_t
 116 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 117 {
 118         struct thermal_zone_device *tz = to_thermal_zone(dev);
 119
 120         return sprintf(buf, "%s\n", tz->type);
 121 }
 122
 123 static ssize_t
 124 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 125 {
 126         struct thermal_zone_device *tz = to_thermal_zone(dev);
 127         long temperature;
 128         int ret;
 129
 130         if (!tz->ops->get_temp)
 131                 return -EPERM;
 132
 133         ret = tz->ops->get_temp(tz, &temperature);
 134
 135         if (ret)
 136                 return ret;
 137
 138         return sprintf(buf, "%ld\n", temperature);
 139 }
 140
 141 static ssize_t
 142 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 143 {
 144         struct thermal_zone_device *tz = to_thermal_zone(dev);
 145         enum thermal_device_mode mode;
 146         int result;
 147
 148         if (!tz->ops->get_mode)
 149                 return -EPERM;
 150
 151         result = tz->ops->get_mode(tz, &mode);
 152         if (result)
 153                 return result;
 154
 155         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 156                        : "disabled");
 157 }
 158
 159 static ssize_t
 160 mode_store(struct device *dev, struct device_attribute *attr,
 161            const char *buf, size_t count)
 162 {
 163         struct thermal_zone_device *tz = to_thermal_zone(dev);
 164         int result;
 165
 166         if (!tz->ops->set_mode)
 167                 return -EPERM;
 168
 169         if (!strncmp(buf, "enabled", sizeof("enabled")))
 170                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 171         else if (!strncmp(buf, "disabled", sizeof("disabled")))
 172                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 173         else
 174                 result = -EINVAL;
 175
 176         if (result)
 177                 return result;
 178
 179         return count;
 180 }
 181
 182 static ssize_t
 183 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 184                      char *buf)
 185 {
 186         struct thermal_zone_device *tz = to_thermal_zone(dev);
 187         enum thermal_trip_type type;
 188         int trip, result;
 189
 190         if (!tz->ops->get_trip_type)
 191                 return -EPERM;
 192
 193         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 194                 return -EINVAL;
 195
 196         result = tz->ops->get_trip_type(tz, trip, &type);
 197         if (result)
 198                 return result;
 199
 200         switch (type) {
 201         case THERMAL_TRIP_CRITICAL:
 202                 return sprintf(buf, "critical\n");
 203         case THERMAL_TRIP_HOT:
 204                 return sprintf(buf, "hot\n");
 205         case THERMAL_TRIP_PASSIVE:
 206                 return sprintf(buf, "passive\n");
 207         case THERMAL_TRIP_ACTIVE:
 208                 return sprintf(buf, "active\n");
 209         default:
 210                 return sprintf(buf, "unknown\n");
 211         }
 212 }
 213
 214 static ssize_t
 215 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 216                      char *buf)
 217 {
 218         struct thermal_zone_device *tz = to_thermal_zone(dev);
 219         int trip, ret;
 220         long temperature;
 221
 222         if (!tz->ops->get_trip_temp)
 223                 return -EPERM;
 224
 225         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 226                 return -EINVAL;
 227
 228         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 229
 230         if (ret)
 231                 return ret;
 232
 233         return sprintf(buf, "%ld\n", temperature);
 234 }
 235
 236 static ssize_t
 237 passive_store(struct device *dev, struct device_attribute *attr,
 238                     const char *buf, size_t count)
 239 {
 240         struct thermal_zone_device *tz = to_thermal_zone(dev);
 241         struct thermal_cooling_device *cdev = NULL;
 242         int state;
 243
 244         if (!sscanf(buf, "%d\n", &state))
 245                 return -EINVAL;
 246
 247         /* sanity check: values below 1000 millicelcius don't make sense
 248          * and can cause the system to go into a thermal heart attack
 249          */
 250         if (state && state < 1000)
 251                 return -EINVAL;
 252
 253         if (state && !tz->forced_passive) {
 254                 mutex_lock(&thermal_list_lock);
 255                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 256                         if (!strncmp("Processor", cdev->type,
 257                                      sizeof("Processor")))
 258                                 thermal_zone_bind_cooling_device(tz,
 259                                                                  THERMAL_TRIPS_NONE,
 260                                                                  cdev);
 261                 }
 262                 mutex_unlock(&thermal_list_lock);
 263                 if (!tz->passive_delay)
 264                         tz->passive_delay = 1000;
 265         } else if (!state && tz->forced_passive) {
 266                 mutex_lock(&thermal_list_lock);
 267                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 268                         if (!strncmp("Processor", cdev->type,
 269                                      sizeof("Processor")))
 270                                 thermal_zone_unbind_cooling_device(tz,
 271                                                                    THERMAL_TRIPS_NONE,
 272                                                                    cdev);
 273                 }
 274                 mutex_unlock(&thermal_list_lock);
 275                 tz->passive_delay = 0;
 276         }
 277
 278         tz->tc1 = 1;
 279         tz->tc2 = 1;
 280
 281         tz->forced_passive = state;
 282
 283         thermal_zone_device_update(tz);
 284
 285         return count;
 286 }
 287
 288 static ssize_t
 289 passive_show(struct device *dev, struct device_attribute *attr,
 290                    char *buf)
 291 {
 292         struct thermal_zone_device *tz = to_thermal_zone(dev);
 293
 294         return sprintf(buf, "%d\n", tz->forced_passive);
 295 }
 296
 297 static DEVICE_ATTR(type, 0444, type_show, NULL);
 298 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 299 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 300 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
 301                    passive_store);
 302
 303 static struct device_attribute trip_point_attrs[] = {
 304         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 305         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 306         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 307         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 308         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 309         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 310         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 311         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 312         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 313         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 314         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 315         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 316         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 317         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 318         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 319         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 320         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 321         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 322         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 323         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 324         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
 325         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
 326         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
 327         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
 328 };
 329
 330 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 331 do {    \
 332         result = device_create_file(_dev,       \
 333                                 &trip_point_attrs[_index * 2]); \
 334         if (result)     \
 335                 break;  \
 336         result = device_create_file(_dev,       \
 337                         &trip_point_attrs[_index * 2 + 1]);     \
 338 } while (0)
 339
 340 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 341 do {    \
 342         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 343         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 344 } while (0)
 345
 346 /* sys I/F for cooling device */
 347 #define to_cooling_device(_dev) \
 348         container_of(_dev, struct thermal_cooling_device, device)
 349
 350 static ssize_t
 351 thermal_cooling_device_type_show(struct device *dev,
 352                                  struct device_attribute *attr, char *buf)
 353 {
 354         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 355
 356         return sprintf(buf, "%s\n", cdev->type);
 357 }
 358
 359 static ssize_t
 360 thermal_cooling_device_max_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_max_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_show(struct device *dev,
 375                                       struct device_attribute *attr, char *buf)
 376 {
 377         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 378         unsigned long state;
 379         int ret;
 380
 381         ret = cdev->ops->get_cur_state(cdev, &state);
 382         if (ret)
 383                 return ret;
 384         return sprintf(buf, "%ld\n", state);
 385 }
 386
 387 static ssize_t
 388 thermal_cooling_device_cur_state_store(struct device *dev,
 389                                        struct device_attribute *attr,
 390                                        const char *buf, size_t count)
 391 {
 392         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 393         unsigned long state;
 394         int result;
 395
 396         if (!sscanf(buf, "%ld\n", &state))
 397                 return -EINVAL;
 398
 399         if ((long)state < 0)
 400                 return -EINVAL;
 401
 402         result = cdev->ops->set_cur_state(cdev, state);
 403         if (result)
 404                 return result;
 405         return count;
 406 }
 407
 408 static struct device_attribute dev_attr_cdev_type =
 409 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 410 static DEVICE_ATTR(max_state, 0444,
 411                    thermal_cooling_device_max_state_show, NULL);
 412 static DEVICE_ATTR(cur_state, 0644,
 413                    thermal_cooling_device_cur_state_show,
 414                    thermal_cooling_device_cur_state_store);
 415
 416 static ssize_t
 417 thermal_cooling_device_trip_point_show(struct device *dev,
 418                                        struct device_attribute *attr, char *buf)
 419 {
 420         struct thermal_cooling_device_instance *instance;
 421
 422         instance =
 423             container_of(attr, struct thermal_cooling_device_instance, attr);
 424
 425         if (instance->trip == THERMAL_TRIPS_NONE)
 426                 return sprintf(buf, "-1\n");
 427         else
 428                 return sprintf(buf, "%d\n", instance->trip);
 429 }
 430
 431 /* Device management */
 432
 433 #if defined(CONFIG_THERMAL_HWMON)
 434
 435 /* hwmon sys I/F */
 436 #include <linux/hwmon.h>
 437 static LIST_HEAD(thermal_hwmon_list);
 438
 439 static ssize_t
 440 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 441 {
 442         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 443         return sprintf(buf, "%s\n", hwmon->type);
 444 }
 445 static DEVICE_ATTR(name, 0444, name_show, NULL);
 446
 447 static ssize_t
 448 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 449 {
 450         long temperature;
 451         int ret;
 452         struct thermal_hwmon_attr *hwmon_attr
 453                         = container_of(attr, struct thermal_hwmon_attr, attr);
 454         struct thermal_zone_device *tz
 455                         = container_of(hwmon_attr, struct thermal_zone_device,
 456                                        temp_input);
 457
 458         ret = tz->ops->get_temp(tz, &temperature);
 459
 460         if (ret)
 461                 return ret;
 462
 463         return sprintf(buf, "%ld\n", temperature);
 464 }
 465
 466 static ssize_t
 467 temp_crit_show(struct device *dev, struct device_attribute *attr,
 468                 char *buf)
 469 {
 470         struct thermal_hwmon_attr *hwmon_attr
 471                         = container_of(attr, struct thermal_hwmon_attr, attr);
 472         struct thermal_zone_device *tz
 473                         = container_of(hwmon_attr, struct thermal_zone_device,
 474                                        temp_crit);
 475         long temperature;
 476         int ret;
 477
 478         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 479         if (ret)
 480                 return ret;
 481
 482         return sprintf(buf, "%ld\n", temperature);
 483 }
 484
 485
 486 static int
 487 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 488 {
 489         struct thermal_hwmon_device *hwmon;
 490         int new_hwmon_device = 1;
 491         int result;
 492
 493         mutex_lock(&thermal_list_lock);
 494         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 495                 if (!strcmp(hwmon->type, tz->type)) {
 496                         new_hwmon_device = 0;
 497                         mutex_unlock(&thermal_list_lock);
 498                         goto register_sys_interface;
 499                 }
 500         mutex_unlock(&thermal_list_lock);
 501
 502         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 503         if (!hwmon)
 504                 return -ENOMEM;
 505
 506         INIT_LIST_HEAD(&hwmon->tz_list);
 507         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 508         hwmon->device = hwmon_device_register(NULL);
 509         if (IS_ERR(hwmon->device)) {
 510                 result = PTR_ERR(hwmon->device);
 511                 goto free_mem;
 512         }
 513         dev_set_drvdata(hwmon->device, hwmon);
 514         result = device_create_file(hwmon->device, &dev_attr_name);
 515         if (result)
 516                 goto unregister_hwmon_device;
 517
 518  register_sys_interface:
 519         tz->hwmon = hwmon;
 520         hwmon->count++;
 521
 522         snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
 523                  "temp%d_input", hwmon->count);
 524         tz->temp_input.attr.attr.name = tz->temp_input.name;
 525         tz->temp_input.attr.attr.mode = 0444;
 526         tz->temp_input.attr.show = temp_input_show;
 527         sysfs_attr_init(&tz->temp_input.attr.attr);
 528         result = device_create_file(hwmon->device, &tz->temp_input.attr);
 529         if (result)
 530                 goto unregister_hwmon_device;
 531
 532         if (tz->ops->get_crit_temp) {
 533                 unsigned long temperature;
 534                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 535                         snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
 536                                 "temp%d_crit", hwmon->count);
 537                         tz->temp_crit.attr.attr.name = tz->temp_crit.name;
 538                         tz->temp_crit.attr.attr.mode = 0444;
 539                         tz->temp_crit.attr.show = temp_crit_show;
 540                         sysfs_attr_init(&tz->temp_crit.attr.attr);
 541                         result = device_create_file(hwmon->device,
 542                                                     &tz->temp_crit.attr);
 543                         if (result)
 544                                 goto unregister_hwmon_device;
 545                 }
 546         }
 547
 548         mutex_lock(&thermal_list_lock);
 549         if (new_hwmon_device)
 550                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 551         list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
 552         mutex_unlock(&thermal_list_lock);
 553
 554         return 0;
 555
 556  unregister_hwmon_device:
 557         device_remove_file(hwmon->device, &tz->temp_crit.attr);
 558         device_remove_file(hwmon->device, &tz->temp_input.attr);
 559         if (new_hwmon_device) {
 560                 device_remove_file(hwmon->device, &dev_attr_name);
 561                 hwmon_device_unregister(hwmon->device);
 562         }
 563  free_mem:
 564         if (new_hwmon_device)
 565                 kfree(hwmon);
 566
 567         return result;
 568 }
 569
 570 static void
 571 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 572 {
 573         struct thermal_hwmon_device *hwmon = tz->hwmon;
 574
 575         tz->hwmon = NULL;
 576         device_remove_file(hwmon->device, &tz->temp_input.attr);
 577         device_remove_file(hwmon->device, &tz->temp_crit.attr);
 578
 579         mutex_lock(&thermal_list_lock);
 580         list_del(&tz->hwmon_node);
 581         if (!list_empty(&hwmon->tz_list)) {
 582                 mutex_unlock(&thermal_list_lock);
 583                 return;
 584         }
 585         list_del(&hwmon->node);
 586         mutex_unlock(&thermal_list_lock);
 587
 588         device_remove_file(hwmon->device, &dev_attr_name);
 589         hwmon_device_unregister(hwmon->device);
 590         kfree(hwmon);
 591 }
 592 #else
 593 static int
 594 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 595 {
 596         return 0;
 597 }
 598
 599 static void
 600 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 601 {
 602 }
 603 #endif
 604
 605 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 606                                             int delay)
 607 {
 608         cancel_delayed_work(&(tz->poll_queue));
 609
 610         if (!delay)
 611                 return;
 612
 613         if (delay > 1000)
 614                 schedule_delayed_work(&(tz->poll_queue),
 615                                       round_jiffies(msecs_to_jiffies(delay)));
 616         else
 617                 schedule_delayed_work(&(tz->poll_queue),
 618                                       msecs_to_jiffies(delay));
 619 }
 620
 621 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 622                                         int temp, int trip_temp, int trip)
 623 {
 624         int trend = 0;
 625         struct thermal_cooling_device_instance *instance;
 626         struct thermal_cooling_device *cdev;
 627         long state, max_state;
 628
 629         /*
 630          * Above Trip?
 631          * -----------
 632          * Calculate the thermal trend (using the passive cooling equation)
 633          * and modify the performance limit for all passive cooling devices
 634          * accordingly.  Note that we assume symmetry.
 635          */
 636         if (temp >= trip_temp) {
 637                 tz->passive = true;
 638
 639                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 640                         (tz->tc2 * (temp - trip_temp));
 641
 642                 /* Heating up? */
 643                 if (trend > 0) {
 644                         list_for_each_entry(instance, &tz->cooling_devices,
 645                                             node) {
 646                                 if (instance->trip != trip)
 647                                         continue;
 648                                 cdev = instance->cdev;
 649                                 cdev->ops->get_cur_state(cdev, &state);
 650                                 cdev->ops->get_max_state(cdev, &max_state);
 651                                 if (state++ < max_state)
 652                                         cdev->ops->set_cur_state(cdev, state);
 653                         }
 654                 } else if (trend < 0) { /* Cooling off? */
 655                         list_for_each_entry(instance, &tz->cooling_devices,
 656                                             node) {
 657                                 if (instance->trip != trip)
 658                                         continue;
 659                                 cdev = instance->cdev;
 660                                 cdev->ops->get_cur_state(cdev, &state);
 661                                 cdev->ops->get_max_state(cdev, &max_state);
 662                                 if (state > 0)
 663                                         cdev->ops->set_cur_state(cdev, --state);
 664                         }
 665                 }
 666                 return;
 667         }
 668
 669         /*
 670          * Below Trip?
 671          * -----------
 672          * Implement passive cooling hysteresis to slowly increase performance
 673          * and avoid thrashing around the passive trip point.  Note that we
 674          * assume symmetry.
 675          */
 676         list_for_each_entry(instance, &tz->cooling_devices, node) {
 677                 if (instance->trip != trip)
 678                         continue;
 679                 cdev = instance->cdev;
 680                 cdev->ops->get_cur_state(cdev, &state);
 681                 cdev->ops->get_max_state(cdev, &max_state);
 682                 if (state > 0)
 683                         cdev->ops->set_cur_state(cdev, --state);
 684                 if (state == 0)
 685                         tz->passive = false;
 686         }
 687 }
 688
 689 static void thermal_zone_device_check(struct work_struct *work)
 690 {
 691         struct thermal_zone_device *tz = container_of(work, struct
 692                                                       thermal_zone_device,
 693                                                       poll_queue.work);
 694         thermal_zone_device_update(tz);
 695 }
 696
 697 /**
 698  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 699  * @tz:         thermal zone device
 700  * @trip:       indicates which trip point the cooling devices is
 701  *              associated with in this thermal zone.
 702  * @cdev:       thermal cooling device
 703  *
 704  * This function is usually called in the thermal zone device .bind callback.
 705  */
 706 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 707                                      int trip,
 708                                      struct thermal_cooling_device *cdev)
 709 {
 710         struct thermal_cooling_device_instance *dev;
 711         struct thermal_cooling_device_instance *pos;
 712         struct thermal_zone_device *pos1;
 713         struct thermal_cooling_device *pos2;
 714         int result;
 715
 716         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 717                 return -EINVAL;
 718
 719         list_for_each_entry(pos1, &thermal_tz_list, node) {
 720                 if (pos1 == tz)
 721                         break;
 722         }
 723         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 724                 if (pos2 == cdev)
 725                         break;
 726         }
 727
 728         if (tz != pos1 || cdev != pos2)
 729                 return -EINVAL;
 730
 731         dev =
 732             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 733         if (!dev)
 734                 return -ENOMEM;
 735         dev->tz = tz;
 736         dev->cdev = cdev;
 737         dev->trip = trip;
 738         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 739         if (result)
 740                 goto free_mem;
 741
 742         sprintf(dev->name, "cdev%d", dev->id);
 743         result =
 744             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 745         if (result)
 746                 goto release_idr;
 747
 748         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 749         sysfs_attr_init(&dev->attr.attr);
 750         dev->attr.attr.name = dev->attr_name;
 751         dev->attr.attr.mode = 0444;
 752         dev->attr.show = thermal_cooling_device_trip_point_show;
 753         result = device_create_file(&tz->device, &dev->attr);
 754         if (result)
 755                 goto remove_symbol_link;
 756
 757         mutex_lock(&tz->lock);
 758         list_for_each_entry(pos, &tz->cooling_devices, node)
 759             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 760                 result = -EEXIST;
 761                 break;
 762         }
 763         if (!result)
 764                 list_add_tail(&dev->node, &tz->cooling_devices);
 765         mutex_unlock(&tz->lock);
 766
 767         if (!result)
 768                 return 0;
 769
 770         device_remove_file(&tz->device, &dev->attr);
 771       remove_symbol_link:
 772         sysfs_remove_link(&tz->device.kobj, dev->name);
 773       release_idr:
 774         release_idr(&tz->idr, &tz->lock, dev->id);
 775       free_mem:
 776         kfree(dev);
 777         return result;
 778 }
 779
 780 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 781
 782 /**
 783  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 784  * @tz:         thermal zone device
 785  * @trip:       indicates which trip point the cooling devices is
 786  *              associated with in this thermal zone.
 787  * @cdev:       thermal cooling device
 788  *
 789  * This function is usually called in the thermal zone device .unbind callback.
 790  */
 791 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 792                                        int trip,
 793                                        struct thermal_cooling_device *cdev)
 794 {
 795         struct thermal_cooling_device_instance *pos, *next;
 796
 797         mutex_lock(&tz->lock);
 798         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 799                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 800                         list_del(&pos->node);
 801                         mutex_unlock(&tz->lock);
 802                         goto unbind;
 803                 }
 804         }
 805         mutex_unlock(&tz->lock);
 806
 807         return -ENODEV;
 808
 809       unbind:
 810         device_remove_file(&tz->device, &pos->attr);
 811         sysfs_remove_link(&tz->device.kobj, pos->name);
 812         release_idr(&tz->idr, &tz->lock, pos->id);
 813         kfree(pos);
 814         return 0;
 815 }
 816
 817 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 818
 819 static void thermal_release(struct device *dev)
 820 {
 821         struct thermal_zone_device *tz;
 822         struct thermal_cooling_device *cdev;
 823
 824         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
 825                 tz = to_thermal_zone(dev);
 826                 kfree(tz);
 827         } else {
 828                 cdev = to_cooling_device(dev);
 829                 kfree(cdev);
 830         }
 831 }
 832
 833 static struct class thermal_class = {
 834         .name = "thermal",
 835         .dev_release = thermal_release,
 836 };
 837
 838 /**
 839  * thermal_cooling_device_register - register a new thermal cooling device
 840  * @type:       the thermal cooling device type.
 841  * @devdata:    device private data.
 842  * @ops:                standard thermal cooling devices callbacks.
 843  */
 844 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
 845                                                                void *devdata,
 846                                                                struct
 847                                                                thermal_cooling_device_ops
 848                                                                *ops)
 849 {
 850         struct thermal_cooling_device *cdev;
 851         struct thermal_zone_device *pos;
 852         int result;
 853
 854         if (strlen(type) >= THERMAL_NAME_LENGTH)
 855                 return ERR_PTR(-EINVAL);
 856
 857         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 858             !ops->set_cur_state)
 859                 return ERR_PTR(-EINVAL);
 860
 861         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 862         if (!cdev)
 863                 return ERR_PTR(-ENOMEM);
 864
 865         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 866         if (result) {
 867                 kfree(cdev);
 868                 return ERR_PTR(result);
 869         }
 870
 871         strcpy(cdev->type, type);
 872         cdev->ops = ops;
 873         cdev->device.class = &thermal_class;
 874         cdev->devdata = devdata;
 875         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 876         result = device_register(&cdev->device);
 877         if (result) {
 878                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 879                 kfree(cdev);
 880                 return ERR_PTR(result);
 881         }
 882
 883         /* sys I/F */
 884         if (type) {
 885                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 886                 if (result)
 887                         goto unregister;
 888         }
 889
 890         result = device_create_file(&cdev->device, &dev_attr_max_state);
 891         if (result)
 892                 goto unregister;
 893
 894         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 895         if (result)
 896                 goto unregister;
 897
 898         mutex_lock(&thermal_list_lock);
 899         list_add(&cdev->node, &thermal_cdev_list);
 900         list_for_each_entry(pos, &thermal_tz_list, node) {
 901                 if (!pos->ops->bind)
 902                         continue;
 903                 result = pos->ops->bind(pos, cdev);
 904                 if (result)
 905                         break;
 906
 907         }
 908         mutex_unlock(&thermal_list_lock);
 909
 910         if (!result)
 911                 return cdev;
 912
 913       unregister:
 914         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 915         device_unregister(&cdev->device);
 916         return ERR_PTR(result);
 917 }
 918
 919 EXPORT_SYMBOL(thermal_cooling_device_register);
 920
 921 /**
 922  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 923  * @cdev:       the thermal cooling device to remove.
 924  *
 925  * thermal_cooling_device_unregister() must be called when the device is no
 926  * longer needed.
 927  */
 928 void thermal_cooling_device_unregister(struct
 929                                        thermal_cooling_device
 930                                        *cdev)
 931 {
 932         struct thermal_zone_device *tz;
 933         struct thermal_cooling_device *pos = NULL;
 934
 935         if (!cdev)
 936                 return;
 937
 938         mutex_lock(&thermal_list_lock);
 939         list_for_each_entry(pos, &thermal_cdev_list, node)
 940             if (pos == cdev)
 941                 break;
 942         if (pos != cdev) {
 943                 /* thermal cooling device not found */
 944                 mutex_unlock(&thermal_list_lock);
 945                 return;
 946         }
 947         list_del(&cdev->node);
 948         list_for_each_entry(tz, &thermal_tz_list, node) {
 949                 if (!tz->ops->unbind)
 950                         continue;
 951                 tz->ops->unbind(tz, cdev);
 952         }
 953         mutex_unlock(&thermal_list_lock);
 954         if (cdev->type[0])
 955                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
 956         device_remove_file(&cdev->device, &dev_attr_max_state);
 957         device_remove_file(&cdev->device, &dev_attr_cur_state);
 958
 959         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 960         device_unregister(&cdev->device);
 961         return;
 962 }
 963
 964 EXPORT_SYMBOL(thermal_cooling_device_unregister);
 965
 966 /**
 967  * thermal_zone_device_update - force an update of a thermal zone's state
 968  * @ttz:        the thermal zone to update
 969  */
 970
 971 void thermal_zone_device_update(struct thermal_zone_device *tz)
 972 {
 973         int count, ret = 0;
 974         long temp, trip_temp;
 975         enum thermal_trip_type trip_type;
 976         struct thermal_cooling_device_instance *instance;
 977         struct thermal_cooling_device *cdev;
 978
 979         mutex_lock(&tz->lock);
 980
 981         if (tz->ops->get_temp(tz, &temp)) {
 982                 /* get_temp failed - retry it later */
 983                 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
 984                        "%d\n", tz->id);
 985                 goto leave;
 986         }
 987
 988         for (count = 0; count < tz->trips; count++) {
 989                 tz->ops->get_trip_type(tz, count, &trip_type);
 990                 tz->ops->get_trip_temp(tz, count, &trip_temp);
 991
 992                 switch (trip_type) {
 993                 case THERMAL_TRIP_CRITICAL:
 994                         if (temp >= trip_temp) {
 995                                 if (tz->ops->notify)
 996                                         ret = tz->ops->notify(tz, count,
 997                                                               trip_type);
 998                                 if (!ret) {
 999                                         printk(KERN_EMERG
1000                                                "Critical temperature reached (%ld C), shutting down.\n",
1001                                                temp/1000);
1002                                         orderly_poweroff(true);
1003                                 }
1004                         }
1005                         break;
1006                 case THERMAL_TRIP_HOT:
1007                         if (temp >= trip_temp)
1008                                 if (tz->ops->notify)
1009                                         tz->ops->notify(tz, count, trip_type);
1010                         break;
1011                 case THERMAL_TRIP_ACTIVE:
1012                         list_for_each_entry(instance, &tz->cooling_devices,
1013                                             node) {
1014                                 if (instance->trip != count)
1015                                         continue;
1016
1017                                 cdev = instance->cdev;
1018
1019                                 if (temp >= trip_temp)
1020                                         cdev->ops->set_cur_state(cdev, 1);
1021                                 else
1022                                         cdev->ops->set_cur_state(cdev, 0);
1023                         }
1024                         break;
1025                 case THERMAL_TRIP_PASSIVE:
1026                         if (temp >= trip_temp || tz->passive)
1027                                 thermal_zone_device_passive(tz, temp,
1028                                                             trip_temp, count);
1029                         break;
1030                 }
1031         }
1032
1033         if (tz->forced_passive)
1034                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1035                                             THERMAL_TRIPS_NONE);
1036
1037         tz->last_temperature = temp;
1038
1039       leave:
1040         if (tz->passive)
1041                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1042         else if (tz->polling_delay)
1043                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1044         else
1045                 thermal_zone_device_set_polling(tz, 0);
1046         mutex_unlock(&tz->lock);
1047 }
1048 EXPORT_SYMBOL(thermal_zone_device_update);
1049
1050 /**
1051  * thermal_zone_device_register - register a new thermal zone device
1052  * @type:       the thermal zone device type
1053  * @trips:      the number of trip points the thermal zone support
1054  * @devdata:    private device data
1055  * @ops:        standard thermal zone device callbacks
1056  * @tc1:        thermal coefficient 1 for passive calculations
1057  * @tc2:        thermal coefficient 2 for passive calculations
1058  * @passive_delay: number of milliseconds to wait between polls when
1059  *                 performing passive cooling
1060  * @polling_delay: number of milliseconds to wait between polls when checking
1061  *                 whether trip points have been crossed (0 for interrupt
1062  *                 driven systems)
1063  *
1064  * thermal_zone_device_unregister() must be called when the device is no
1065  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1066  * section 11.1.5.1 of the ACPI specification 3.0.
1067  */
1068 struct thermal_zone_device *thermal_zone_device_register(char *type,
1069                                                          int trips,
1070                                                          void *devdata, struct
1071                                                          thermal_zone_device_ops
1072                                                          *ops, int tc1, int
1073                                                          tc2,
1074                                                          int passive_delay,
1075                                                          int polling_delay)
1076 {
1077         struct thermal_zone_device *tz;
1078         struct thermal_cooling_device *pos;
1079         enum thermal_trip_type trip_type;
1080         int result;
1081         int count;
1082         int passive = 0;
1083
1084         if (strlen(type) >= THERMAL_NAME_LENGTH)
1085                 return ERR_PTR(-EINVAL);
1086
1087         if (trips > THERMAL_MAX_TRIPS || trips < 0)
1088                 return ERR_PTR(-EINVAL);
1089
1090         if (!ops || !ops->get_temp)
1091                 return ERR_PTR(-EINVAL);
1092
1093         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1094         if (!tz)
1095                 return ERR_PTR(-ENOMEM);
1096
1097         INIT_LIST_HEAD(&tz->cooling_devices);
1098         idr_init(&tz->idr);
1099         mutex_init(&tz->lock);
1100         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1101         if (result) {
1102                 kfree(tz);
1103                 return ERR_PTR(result);
1104         }
1105
1106         strcpy(tz->type, type);
1107         tz->ops = ops;
1108         tz->device.class = &thermal_class;
1109         tz->devdata = devdata;
1110         tz->trips = trips;
1111         tz->tc1 = tc1;
1112         tz->tc2 = tc2;
1113         tz->passive_delay = passive_delay;
1114         tz->polling_delay = polling_delay;
1115
1116         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1117         result = device_register(&tz->device);
1118         if (result) {
1119                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1120                 kfree(tz);
1121                 return ERR_PTR(result);
1122         }
1123
1124         /* sys I/F */
1125         if (type) {
1126                 result = device_create_file(&tz->device, &dev_attr_type);
1127                 if (result)
1128                         goto unregister;
1129         }
1130
1131         result = device_create_file(&tz->device, &dev_attr_temp);
1132         if (result)
1133                 goto unregister;
1134
1135         if (ops->get_mode) {
1136                 result = device_create_file(&tz->device, &dev_attr_mode);
1137                 if (result)
1138                         goto unregister;
1139         }
1140
1141         for (count = 0; count < trips; count++) {
1142                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1143                 if (result)
1144                         goto unregister;
1145                 tz->ops->get_trip_type(tz, count, &trip_type);
1146                 if (trip_type == THERMAL_TRIP_PASSIVE)
1147                         passive = 1;
1148         }
1149
1150         if (!passive)
1151                 result = device_create_file(&tz->device,
1152                                             &dev_attr_passive);
1153
1154         if (result)
1155                 goto unregister;
1156
1157         result = thermal_add_hwmon_sysfs(tz);
1158         if (result)
1159                 goto unregister;
1160
1161         mutex_lock(&thermal_list_lock);
1162         list_add_tail(&tz->node, &thermal_tz_list);
1163         if (ops->bind)
1164                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1165                 result = ops->bind(tz, pos);
1166                 if (result)
1167                         break;
1168                 }
1169         mutex_unlock(&thermal_list_lock);
1170
1171         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1172
1173         thermal_zone_device_update(tz);
1174
1175         if (!result)
1176                 return tz;
1177
1178       unregister:
1179         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1180         device_unregister(&tz->device);
1181         return ERR_PTR(result);
1182 }
1183
1184 EXPORT_SYMBOL(thermal_zone_device_register);
1185
1186 /**
1187  * thermal_device_unregister - removes the registered thermal zone device
1188  * @tz: the thermal zone device to remove
1189  */
1190 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1191 {
1192         struct thermal_cooling_device *cdev;
1193         struct thermal_zone_device *pos = NULL;
1194         int count;
1195
1196         if (!tz)
1197                 return;
1198
1199         mutex_lock(&thermal_list_lock);
1200         list_for_each_entry(pos, &thermal_tz_list, node)
1201             if (pos == tz)
1202                 break;
1203         if (pos != tz) {
1204                 /* thermal zone device not found */
1205                 mutex_unlock(&thermal_list_lock);
1206                 return;
1207         }
1208         list_del(&tz->node);
1209         if (tz->ops->unbind)
1210                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1211                     tz->ops->unbind(tz, cdev);
1212         mutex_unlock(&thermal_list_lock);
1213
1214         thermal_zone_device_set_polling(tz, 0);
1215
1216         if (tz->type[0])
1217                 device_remove_file(&tz->device, &dev_attr_type);
1218         device_remove_file(&tz->device, &dev_attr_temp);
1219         if (tz->ops->get_mode)
1220                 device_remove_file(&tz->device, &dev_attr_mode);
1221
1222         for (count = 0; count < tz->trips; count++)
1223                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1224
1225         thermal_remove_hwmon_sysfs(tz);
1226         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1227         idr_destroy(&tz->idr);
1228         mutex_destroy(&tz->lock);
1229         device_unregister(&tz->device);
1230         return;
1231 }
1232
1233 EXPORT_SYMBOL(thermal_zone_device_unregister);
1234
1235 int generate_netlink_event(u32 orig, enum events event)
1236 {
1237         struct sk_buff *skb;
1238         struct nlattr *attr;
1239         struct thermal_genl_event *thermal_event;
1240         void *msg_header;
1241         int size;
1242         int result;
1243
1244         /* allocate memory */
1245         size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1246                                 nla_total_size(0);
1247
1248         skb = genlmsg_new(size, GFP_ATOMIC);
1249         if (!skb)
1250                 return -ENOMEM;
1251
1252         /* add the genetlink message header */
1253         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1254                                  &thermal_event_genl_family, 0,
1255                                  THERMAL_GENL_CMD_EVENT);
1256         if (!msg_header) {
1257                 nlmsg_free(skb);
1258                 return -ENOMEM;
1259         }
1260
1261         /* fill the data */
1262         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1263                         sizeof(struct thermal_genl_event));
1264
1265         if (!attr) {
1266                 nlmsg_free(skb);
1267                 return -EINVAL;
1268         }
1269
1270         thermal_event = nla_data(attr);
1271         if (!thermal_event) {
1272                 nlmsg_free(skb);
1273                 return -EINVAL;
1274         }
1275
1276         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1277
1278         thermal_event->orig = orig;
1279         thermal_event->event = event;
1280
1281         /* send multicast genetlink message */
1282         result = genlmsg_end(skb, msg_header);
1283         if (result < 0) {
1284                 nlmsg_free(skb);
1285                 return result;
1286         }
1287
1288         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1289         if (result)
1290                 printk(KERN_INFO "failed to send netlink event:%d", result);
1291
1292         return result;
1293 }
1294 EXPORT_SYMBOL(generate_netlink_event);
1295
1296 static int genetlink_init(void)
1297 {
1298         int result;
1299
1300         result = genl_register_family(&thermal_event_genl_family);
1301         if (result)
1302                 return result;
1303
1304         result = genl_register_mc_group(&thermal_event_genl_family,
1305                                         &thermal_event_mcgrp);
1306         if (result)
1307                 genl_unregister_family(&thermal_event_genl_family);
1308         return result;
1309 }
1310
1311 static int __init thermal_init(void)
1312 {
1313         int result = 0;
1314
1315         result = class_register(&thermal_class);
1316         if (result) {
1317                 idr_destroy(&thermal_tz_idr);
1318                 idr_destroy(&thermal_cdev_idr);
1319                 mutex_destroy(&thermal_idr_lock);
1320                 mutex_destroy(&thermal_list_lock);
1321         }
1322         result = genetlink_init();
1323         return result;
1324 }
1325
1326 static void genetlink_exit(void)
1327 {
1328         genl_unregister_family(&thermal_event_genl_family);
1329 }
1330
1331 static void __exit thermal_exit(void)
1332 {
1333         class_unregister(&thermal_class);
1334         idr_destroy(&thermal_tz_idr);
1335         idr_destroy(&thermal_cdev_idr);
1336         mutex_destroy(&thermal_idr_lock);
1337         mutex_destroy(&thermal_list_lock);
1338         genetlink_exit();
1339 }
1340
1341 fs_initcall(thermal_init);
1342 module_exit(thermal_exit);