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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/reboot.h>
  37 #include <net/netlink.h>
  38 #include <net/genetlink.h>
  39
  40 MODULE_AUTHOR("Zhang Rui");
  41 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  42 MODULE_LICENSE("GPL");
  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 int get_idr(struct idr *idr, struct mutex *lock, int *id)
  64 {
  65         int err;
  66
  67 again:
  68         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  69                 return -ENOMEM;
  70
  71         if (lock)
  72                 mutex_lock(lock);
  73         err = idr_get_new(idr, NULL, id);
  74         if (lock)
  75                 mutex_unlock(lock);
  76         if (unlikely(err == -EAGAIN))
  77                 goto again;
  78         else if (unlikely(err))
  79                 return err;
  80
  81         *id = *id & MAX_ID_MASK;
  82         return 0;
  83 }
  84
  85 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  86 {
  87         if (lock)
  88                 mutex_lock(lock);
  89         idr_remove(idr, id);
  90         if (lock)
  91                 mutex_unlock(lock);
  92 }
  93
  94 /* sys I/F for thermal zone */
  95
  96 #define to_thermal_zone(_dev) \
  97         container_of(_dev, struct thermal_zone_device, device)
  98
  99 static ssize_t
 100 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 101 {
 102         struct thermal_zone_device *tz = to_thermal_zone(dev);
 103
 104         return sprintf(buf, "%s\n", tz->type);
 105 }
 106
 107 static ssize_t
 108 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 109 {
 110         struct thermal_zone_device *tz = to_thermal_zone(dev);
 111         long temperature;
 112         int ret;
 113
 114         if (!tz->ops->get_temp)
 115                 return -EPERM;
 116
 117         ret = tz->ops->get_temp(tz, &temperature);
 118
 119         if (ret)
 120                 return ret;
 121
 122         return sprintf(buf, "%ld\n", temperature);
 123 }
 124
 125 static ssize_t
 126 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 127 {
 128         struct thermal_zone_device *tz = to_thermal_zone(dev);
 129         enum thermal_device_mode mode;
 130         int result;
 131
 132         if (!tz->ops->get_mode)
 133                 return -EPERM;
 134
 135         result = tz->ops->get_mode(tz, &mode);
 136         if (result)
 137                 return result;
 138
 139         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 140                        : "disabled");
 141 }
 142
 143 static ssize_t
 144 mode_store(struct device *dev, struct device_attribute *attr,
 145            const char *buf, size_t count)
 146 {
 147         struct thermal_zone_device *tz = to_thermal_zone(dev);
 148         int result;
 149
 150         if (!tz->ops->set_mode)
 151                 return -EPERM;
 152
 153         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 154                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 155         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 156                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 157         else
 158                 result = -EINVAL;
 159
 160         if (result)
 161                 return result;
 162
 163         return count;
 164 }
 165
 166 static ssize_t
 167 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 168                      char *buf)
 169 {
 170         struct thermal_zone_device *tz = to_thermal_zone(dev);
 171         enum thermal_trip_type type;
 172         int trip, result;
 173
 174         if (!tz->ops->get_trip_type)
 175                 return -EPERM;
 176
 177         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 178                 return -EINVAL;
 179
 180         result = tz->ops->get_trip_type(tz, trip, &type);
 181         if (result)
 182                 return result;
 183
 184         switch (type) {
 185         case THERMAL_TRIP_CRITICAL:
 186                 return sprintf(buf, "critical\n");
 187         case THERMAL_TRIP_HOT:
 188                 return sprintf(buf, "hot\n");
 189         case THERMAL_TRIP_PASSIVE:
 190                 return sprintf(buf, "passive\n");
 191         case THERMAL_TRIP_ACTIVE:
 192                 return sprintf(buf, "active\n");
 193         default:
 194                 return sprintf(buf, "unknown\n");
 195         }
 196 }
 197
 198 static ssize_t
 199 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 200                      const char *buf, size_t count)
 201 {
 202         struct thermal_zone_device *tz = to_thermal_zone(dev);
 203         int trip, ret;
 204         unsigned long temperature;
 205
 206         if (!tz->ops->set_trip_temp)
 207                 return -EPERM;
 208
 209         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 210                 return -EINVAL;
 211
 212         if (kstrtoul(buf, 10, &temperature))
 213                 return -EINVAL;
 214
 215         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 216
 217         return ret ? ret : count;
 218 }
 219
 220 static ssize_t
 221 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 222                      char *buf)
 223 {
 224         struct thermal_zone_device *tz = to_thermal_zone(dev);
 225         int trip, ret;
 226         long temperature;
 227
 228         if (!tz->ops->get_trip_temp)
 229                 return -EPERM;
 230
 231         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 232                 return -EINVAL;
 233
 234         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 235
 236         if (ret)
 237                 return ret;
 238
 239         return sprintf(buf, "%ld\n", temperature);
 240 }
 241
 242 static ssize_t
 243 passive_store(struct device *dev, struct device_attribute *attr,
 244                     const char *buf, size_t count)
 245 {
 246         struct thermal_zone_device *tz = to_thermal_zone(dev);
 247         struct thermal_cooling_device *cdev = NULL;
 248         int state;
 249
 250         if (!sscanf(buf, "%d\n", &state))
 251                 return -EINVAL;
 252
 253         /* sanity check: values below 1000 millicelcius don't make sense
 254          * and can cause the system to go into a thermal heart attack
 255          */
 256         if (state && state < 1000)
 257                 return -EINVAL;
 258
 259         if (state && !tz->forced_passive) {
 260                 mutex_lock(&thermal_list_lock);
 261                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 262                         if (!strncmp("Processor", cdev->type,
 263                                      sizeof("Processor")))
 264                                 thermal_zone_bind_cooling_device(tz,
 265                                                                  THERMAL_TRIPS_NONE,
 266                                                                  cdev);
 267                 }
 268                 mutex_unlock(&thermal_list_lock);
 269                 if (!tz->passive_delay)
 270                         tz->passive_delay = 1000;
 271         } else if (!state && tz->forced_passive) {
 272                 mutex_lock(&thermal_list_lock);
 273                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 274                         if (!strncmp("Processor", cdev->type,
 275                                      sizeof("Processor")))
 276                                 thermal_zone_unbind_cooling_device(tz,
 277                                                                    THERMAL_TRIPS_NONE,
 278                                                                    cdev);
 279                 }
 280                 mutex_unlock(&thermal_list_lock);
 281                 tz->passive_delay = 0;
 282         }
 283
 284         tz->tc1 = 1;
 285         tz->tc2 = 1;
 286
 287         tz->forced_passive = state;
 288
 289         thermal_zone_device_update(tz);
 290
 291         return count;
 292 }
 293
 294 static ssize_t
 295 passive_show(struct device *dev, struct device_attribute *attr,
 296                    char *buf)
 297 {
 298         struct thermal_zone_device *tz = to_thermal_zone(dev);
 299
 300         return sprintf(buf, "%d\n", tz->forced_passive);
 301 }
 302
 303 static DEVICE_ATTR(type, 0444, type_show, NULL);
 304 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 305 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 306 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 307
 308 /* sys I/F for cooling device */
 309 #define to_cooling_device(_dev) \
 310         container_of(_dev, struct thermal_cooling_device, device)
 311
 312 static ssize_t
 313 thermal_cooling_device_type_show(struct device *dev,
 314                                  struct device_attribute *attr, char *buf)
 315 {
 316         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 317
 318         return sprintf(buf, "%s\n", cdev->type);
 319 }
 320
 321 static ssize_t
 322 thermal_cooling_device_max_state_show(struct device *dev,
 323                                       struct device_attribute *attr, char *buf)
 324 {
 325         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 326         unsigned long state;
 327         int ret;
 328
 329         ret = cdev->ops->get_max_state(cdev, &state);
 330         if (ret)
 331                 return ret;
 332         return sprintf(buf, "%ld\n", state);
 333 }
 334
 335 static ssize_t
 336 thermal_cooling_device_cur_state_show(struct device *dev,
 337                                       struct device_attribute *attr, char *buf)
 338 {
 339         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 340         unsigned long state;
 341         int ret;
 342
 343         ret = cdev->ops->get_cur_state(cdev, &state);
 344         if (ret)
 345                 return ret;
 346         return sprintf(buf, "%ld\n", state);
 347 }
 348
 349 static ssize_t
 350 thermal_cooling_device_cur_state_store(struct device *dev,
 351                                        struct device_attribute *attr,
 352                                        const char *buf, size_t count)
 353 {
 354         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 355         unsigned long state;
 356         int result;
 357
 358         if (!sscanf(buf, "%ld\n", &state))
 359                 return -EINVAL;
 360
 361         if ((long)state < 0)
 362                 return -EINVAL;
 363
 364         result = cdev->ops->set_cur_state(cdev, state);
 365         if (result)
 366                 return result;
 367         return count;
 368 }
 369
 370 static struct device_attribute dev_attr_cdev_type =
 371 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 372 static DEVICE_ATTR(max_state, 0444,
 373                    thermal_cooling_device_max_state_show, NULL);
 374 static DEVICE_ATTR(cur_state, 0644,
 375                    thermal_cooling_device_cur_state_show,
 376                    thermal_cooling_device_cur_state_store);
 377
 378 static ssize_t
 379 thermal_cooling_device_trip_point_show(struct device *dev,
 380                                        struct device_attribute *attr, char *buf)
 381 {
 382         struct thermal_cooling_device_instance *instance;
 383
 384         instance =
 385             container_of(attr, struct thermal_cooling_device_instance, attr);
 386
 387         if (instance->trip == THERMAL_TRIPS_NONE)
 388                 return sprintf(buf, "-1\n");
 389         else
 390                 return sprintf(buf, "%d\n", instance->trip);
 391 }
 392
 393 /* Device management */
 394
 395 #if defined(CONFIG_THERMAL_HWMON)
 396
 397 /* hwmon sys I/F */
 398 #include <linux/hwmon.h>
 399
 400 /* thermal zone devices with the same type share one hwmon device */
 401 struct thermal_hwmon_device {
 402         char type[THERMAL_NAME_LENGTH];
 403         struct device *device;
 404         int count;
 405         struct list_head tz_list;
 406         struct list_head node;
 407 };
 408
 409 struct thermal_hwmon_attr {
 410         struct device_attribute attr;
 411         char name[16];
 412 };
 413
 414 /* one temperature input for each thermal zone */
 415 struct thermal_hwmon_temp {
 416         struct list_head hwmon_node;
 417         struct thermal_zone_device *tz;
 418         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 419         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 420 };
 421
 422 static LIST_HEAD(thermal_hwmon_list);
 423
 424 static ssize_t
 425 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 426 {
 427         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 428         return sprintf(buf, "%s\n", hwmon->type);
 429 }
 430 static DEVICE_ATTR(name, 0444, name_show, NULL);
 431
 432 static ssize_t
 433 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 434 {
 435         long temperature;
 436         int ret;
 437         struct thermal_hwmon_attr *hwmon_attr
 438                         = container_of(attr, struct thermal_hwmon_attr, attr);
 439         struct thermal_hwmon_temp *temp
 440                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 441                                        temp_input);
 442         struct thermal_zone_device *tz = temp->tz;
 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_hwmon_temp *temp
 459                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 460                                        temp_crit);
 461         struct thermal_zone_device *tz = temp->tz;
 462         long temperature;
 463         int ret;
 464
 465         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 466         if (ret)
 467                 return ret;
 468
 469         return sprintf(buf, "%ld\n", temperature);
 470 }
 471
 472
 473 static struct thermal_hwmon_device *
 474 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 475 {
 476         struct thermal_hwmon_device *hwmon;
 477
 478         mutex_lock(&thermal_list_lock);
 479         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 480                 if (!strcmp(hwmon->type, tz->type)) {
 481                         mutex_unlock(&thermal_list_lock);
 482                         return hwmon;
 483                 }
 484         mutex_unlock(&thermal_list_lock);
 485
 486         return NULL;
 487 }
 488
 489 /* Find the temperature input matching a given thermal zone */
 490 static struct thermal_hwmon_temp *
 491 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 492                           const struct thermal_zone_device *tz)
 493 {
 494         struct thermal_hwmon_temp *temp;
 495
 496         mutex_lock(&thermal_list_lock);
 497         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 498                 if (temp->tz == tz) {
 499                         mutex_unlock(&thermal_list_lock);
 500                         return temp;
 501                 }
 502         mutex_unlock(&thermal_list_lock);
 503
 504         return NULL;
 505 }
 506
 507 static int
 508 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 509 {
 510         struct thermal_hwmon_device *hwmon;
 511         struct thermal_hwmon_temp *temp;
 512         int new_hwmon_device = 1;
 513         int result;
 514
 515         hwmon = thermal_hwmon_lookup_by_type(tz);
 516         if (hwmon) {
 517                 new_hwmon_device = 0;
 518                 goto register_sys_interface;
 519         }
 520
 521         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 522         if (!hwmon)
 523                 return -ENOMEM;
 524
 525         INIT_LIST_HEAD(&hwmon->tz_list);
 526         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 527         hwmon->device = hwmon_device_register(NULL);
 528         if (IS_ERR(hwmon->device)) {
 529                 result = PTR_ERR(hwmon->device);
 530                 goto free_mem;
 531         }
 532         dev_set_drvdata(hwmon->device, hwmon);
 533         result = device_create_file(hwmon->device, &dev_attr_name);
 534         if (result)
 535                 goto free_mem;
 536
 537  register_sys_interface:
 538         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 539         if (!temp) {
 540                 result = -ENOMEM;
 541                 goto unregister_name;
 542         }
 543
 544         temp->tz = tz;
 545         hwmon->count++;
 546
 547         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
 548                  "temp%d_input", hwmon->count);
 549         temp->temp_input.attr.attr.name = temp->temp_input.name;
 550         temp->temp_input.attr.attr.mode = 0444;
 551         temp->temp_input.attr.show = temp_input_show;
 552         sysfs_attr_init(&temp->temp_input.attr.attr);
 553         result = device_create_file(hwmon->device, &temp->temp_input.attr);
 554         if (result)
 555                 goto free_temp_mem;
 556
 557         if (tz->ops->get_crit_temp) {
 558                 unsigned long temperature;
 559                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 560                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
 561                                 "temp%d_crit", hwmon->count);
 562                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 563                         temp->temp_crit.attr.attr.mode = 0444;
 564                         temp->temp_crit.attr.show = temp_crit_show;
 565                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 566                         result = device_create_file(hwmon->device,
 567                                                     &temp->temp_crit.attr);
 568                         if (result)
 569                                 goto unregister_input;
 570                 }
 571         }
 572
 573         mutex_lock(&thermal_list_lock);
 574         if (new_hwmon_device)
 575                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 576         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 577         mutex_unlock(&thermal_list_lock);
 578
 579         return 0;
 580
 581  unregister_input:
 582         device_remove_file(hwmon->device, &temp->temp_input.attr);
 583  free_temp_mem:
 584         kfree(temp);
 585  unregister_name:
 586         if (new_hwmon_device) {
 587                 device_remove_file(hwmon->device, &dev_attr_name);
 588                 hwmon_device_unregister(hwmon->device);
 589         }
 590  free_mem:
 591         if (new_hwmon_device)
 592                 kfree(hwmon);
 593
 594         return result;
 595 }
 596
 597 static void
 598 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 599 {
 600         struct thermal_hwmon_device *hwmon;
 601         struct thermal_hwmon_temp *temp;
 602
 603         hwmon = thermal_hwmon_lookup_by_type(tz);
 604         if (unlikely(!hwmon)) {
 605                 /* Should never happen... */
 606                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 607                 return;
 608         }
 609
 610         temp = thermal_hwmon_lookup_temp(hwmon, tz);
 611         if (unlikely(!temp)) {
 612                 /* Should never happen... */
 613                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
 614                 return;
 615         }
 616
 617         device_remove_file(hwmon->device, &temp->temp_input.attr);
 618         if (tz->ops->get_crit_temp)
 619                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
 620
 621         mutex_lock(&thermal_list_lock);
 622         list_del(&temp->hwmon_node);
 623         kfree(temp);
 624         if (!list_empty(&hwmon->tz_list)) {
 625                 mutex_unlock(&thermal_list_lock);
 626                 return;
 627         }
 628         list_del(&hwmon->node);
 629         mutex_unlock(&thermal_list_lock);
 630
 631         device_remove_file(hwmon->device, &dev_attr_name);
 632         hwmon_device_unregister(hwmon->device);
 633         kfree(hwmon);
 634 }
 635 #else
 636 static int
 637 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 638 {
 639         return 0;
 640 }
 641
 642 static void
 643 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 644 {
 645 }
 646 #endif
 647
 648 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 649                                             int delay)
 650 {
 651         cancel_delayed_work(&(tz->poll_queue));
 652
 653         if (!delay)
 654                 return;
 655
 656         if (delay > 1000)
 657                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 658                                       round_jiffies(msecs_to_jiffies(delay)));
 659         else
 660                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 661                                       msecs_to_jiffies(delay));
 662 }
 663
 664 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 665                                         int temp, int trip_temp, int trip)
 666 {
 667         int trend = 0;
 668         struct thermal_cooling_device_instance *instance;
 669         struct thermal_cooling_device *cdev;
 670         long state, max_state;
 671
 672         /*
 673          * Above Trip?
 674          * -----------
 675          * Calculate the thermal trend (using the passive cooling equation)
 676          * and modify the performance limit for all passive cooling devices
 677          * accordingly.  Note that we assume symmetry.
 678          */
 679         if (temp >= trip_temp) {
 680                 tz->passive = true;
 681
 682                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 683                         (tz->tc2 * (temp - trip_temp));
 684
 685                 /* Heating up? */
 686                 if (trend > 0) {
 687                         list_for_each_entry(instance, &tz->cooling_devices,
 688                                             node) {
 689                                 if (instance->trip != trip)
 690                                         continue;
 691                                 cdev = instance->cdev;
 692                                 cdev->ops->get_cur_state(cdev, &state);
 693                                 cdev->ops->get_max_state(cdev, &max_state);
 694                                 if (state++ < max_state)
 695                                         cdev->ops->set_cur_state(cdev, state);
 696                         }
 697                 } else if (trend < 0) { /* Cooling off? */
 698                         list_for_each_entry(instance, &tz->cooling_devices,
 699                                             node) {
 700                                 if (instance->trip != trip)
 701                                         continue;
 702                                 cdev = instance->cdev;
 703                                 cdev->ops->get_cur_state(cdev, &state);
 704                                 cdev->ops->get_max_state(cdev, &max_state);
 705                                 if (state > 0)
 706                                         cdev->ops->set_cur_state(cdev, --state);
 707                         }
 708                 }
 709                 return;
 710         }
 711
 712         /*
 713          * Below Trip?
 714          * -----------
 715          * Implement passive cooling hysteresis to slowly increase performance
 716          * and avoid thrashing around the passive trip point.  Note that we
 717          * assume symmetry.
 718          */
 719         list_for_each_entry(instance, &tz->cooling_devices, node) {
 720                 if (instance->trip != trip)
 721                         continue;
 722                 cdev = instance->cdev;
 723                 cdev->ops->get_cur_state(cdev, &state);
 724                 cdev->ops->get_max_state(cdev, &max_state);
 725                 if (state > 0)
 726                         cdev->ops->set_cur_state(cdev, --state);
 727                 if (state == 0)
 728                         tz->passive = false;
 729         }
 730 }
 731
 732 static void thermal_zone_device_check(struct work_struct *work)
 733 {
 734         struct thermal_zone_device *tz = container_of(work, struct
 735                                                       thermal_zone_device,
 736                                                       poll_queue.work);
 737         thermal_zone_device_update(tz);
 738 }
 739
 740 /**
 741  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 742  * @tz:         thermal zone device
 743  * @trip:       indicates which trip point the cooling devices is
 744  *              associated with in this thermal zone.
 745  * @cdev:       thermal cooling device
 746  *
 747  * This function is usually called in the thermal zone device .bind callback.
 748  */
 749 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 750                                      int trip,
 751                                      struct thermal_cooling_device *cdev)
 752 {
 753         struct thermal_cooling_device_instance *dev;
 754         struct thermal_cooling_device_instance *pos;
 755         struct thermal_zone_device *pos1;
 756         struct thermal_cooling_device *pos2;
 757         int result;
 758
 759         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 760                 return -EINVAL;
 761
 762         list_for_each_entry(pos1, &thermal_tz_list, node) {
 763                 if (pos1 == tz)
 764                         break;
 765         }
 766         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 767                 if (pos2 == cdev)
 768                         break;
 769         }
 770
 771         if (tz != pos1 || cdev != pos2)
 772                 return -EINVAL;
 773
 774         dev =
 775             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 776         if (!dev)
 777                 return -ENOMEM;
 778         dev->tz = tz;
 779         dev->cdev = cdev;
 780         dev->trip = trip;
 781         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 782         if (result)
 783                 goto free_mem;
 784
 785         sprintf(dev->name, "cdev%d", dev->id);
 786         result =
 787             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 788         if (result)
 789                 goto release_idr;
 790
 791         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 792         sysfs_attr_init(&dev->attr.attr);
 793         dev->attr.attr.name = dev->attr_name;
 794         dev->attr.attr.mode = 0444;
 795         dev->attr.show = thermal_cooling_device_trip_point_show;
 796         result = device_create_file(&tz->device, &dev->attr);
 797         if (result)
 798                 goto remove_symbol_link;
 799
 800         mutex_lock(&tz->lock);
 801         list_for_each_entry(pos, &tz->cooling_devices, node)
 802             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 803                 result = -EEXIST;
 804                 break;
 805         }
 806         if (!result)
 807                 list_add_tail(&dev->node, &tz->cooling_devices);
 808         mutex_unlock(&tz->lock);
 809
 810         if (!result)
 811                 return 0;
 812
 813         device_remove_file(&tz->device, &dev->attr);
 814 remove_symbol_link:
 815         sysfs_remove_link(&tz->device.kobj, dev->name);
 816 release_idr:
 817         release_idr(&tz->idr, &tz->lock, dev->id);
 818 free_mem:
 819         kfree(dev);
 820         return result;
 821 }
 822 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 823
 824 /**
 825  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 826  * @tz:         thermal zone device
 827  * @trip:       indicates which trip point the cooling devices is
 828  *              associated with in this thermal zone.
 829  * @cdev:       thermal cooling device
 830  *
 831  * This function is usually called in the thermal zone device .unbind callback.
 832  */
 833 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 834                                        int trip,
 835                                        struct thermal_cooling_device *cdev)
 836 {
 837         struct thermal_cooling_device_instance *pos, *next;
 838
 839         mutex_lock(&tz->lock);
 840         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 841                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 842                         list_del(&pos->node);
 843                         mutex_unlock(&tz->lock);
 844                         goto unbind;
 845                 }
 846         }
 847         mutex_unlock(&tz->lock);
 848
 849         return -ENODEV;
 850
 851 unbind:
 852         device_remove_file(&tz->device, &pos->attr);
 853         sysfs_remove_link(&tz->device.kobj, pos->name);
 854         release_idr(&tz->idr, &tz->lock, pos->id);
 855         kfree(pos);
 856         return 0;
 857 }
 858 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 859
 860 static void thermal_release(struct device *dev)
 861 {
 862         struct thermal_zone_device *tz;
 863         struct thermal_cooling_device *cdev;
 864
 865         if (!strncmp(dev_name(dev), "thermal_zone",
 866                      sizeof("thermal_zone") - 1)) {
 867                 tz = to_thermal_zone(dev);
 868                 kfree(tz);
 869         } else {
 870                 cdev = to_cooling_device(dev);
 871                 kfree(cdev);
 872         }
 873 }
 874
 875 static struct class thermal_class = {
 876         .name = "thermal",
 877         .dev_release = thermal_release,
 878 };
 879
 880 /**
 881  * thermal_cooling_device_register - register a new thermal cooling device
 882  * @type:       the thermal cooling device type.
 883  * @devdata:    device private data.
 884  * @ops:                standard thermal cooling devices callbacks.
 885  */
 886 struct thermal_cooling_device *
 887 thermal_cooling_device_register(char *type, void *devdata,
 888                                 const struct thermal_cooling_device_ops *ops)
 889 {
 890         struct thermal_cooling_device *cdev;
 891         struct thermal_zone_device *pos;
 892         int result;
 893
 894         if (strlen(type) >= THERMAL_NAME_LENGTH)
 895                 return ERR_PTR(-EINVAL);
 896
 897         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 898             !ops->set_cur_state)
 899                 return ERR_PTR(-EINVAL);
 900
 901         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 902         if (!cdev)
 903                 return ERR_PTR(-ENOMEM);
 904
 905         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 906         if (result) {
 907                 kfree(cdev);
 908                 return ERR_PTR(result);
 909         }
 910
 911         strcpy(cdev->type, type);
 912         cdev->ops = ops;
 913         cdev->device.class = &thermal_class;
 914         cdev->devdata = devdata;
 915         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 916         result = device_register(&cdev->device);
 917         if (result) {
 918                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 919                 kfree(cdev);
 920                 return ERR_PTR(result);
 921         }
 922
 923         /* sys I/F */
 924         if (type) {
 925                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 926                 if (result)
 927                         goto unregister;
 928         }
 929
 930         result = device_create_file(&cdev->device, &dev_attr_max_state);
 931         if (result)
 932                 goto unregister;
 933
 934         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 935         if (result)
 936                 goto unregister;
 937
 938         mutex_lock(&thermal_list_lock);
 939         list_add(&cdev->node, &thermal_cdev_list);
 940         list_for_each_entry(pos, &thermal_tz_list, node) {
 941                 if (!pos->ops->bind)
 942                         continue;
 943                 result = pos->ops->bind(pos, cdev);
 944                 if (result)
 945                         break;
 946
 947         }
 948         mutex_unlock(&thermal_list_lock);
 949
 950         if (!result)
 951                 return cdev;
 952
 953 unregister:
 954         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 955         device_unregister(&cdev->device);
 956         return ERR_PTR(result);
 957 }
 958 EXPORT_SYMBOL(thermal_cooling_device_register);
 959
 960 /**
 961  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 962  * @cdev:       the thermal cooling device to remove.
 963  *
 964  * thermal_cooling_device_unregister() must be called when the device is no
 965  * longer needed.
 966  */
 967 void thermal_cooling_device_unregister(struct
 968                                        thermal_cooling_device
 969                                        *cdev)
 970 {
 971         struct thermal_zone_device *tz;
 972         struct thermal_cooling_device *pos = NULL;
 973
 974         if (!cdev)
 975                 return;
 976
 977         mutex_lock(&thermal_list_lock);
 978         list_for_each_entry(pos, &thermal_cdev_list, node)
 979             if (pos == cdev)
 980                 break;
 981         if (pos != cdev) {
 982                 /* thermal cooling device not found */
 983                 mutex_unlock(&thermal_list_lock);
 984                 return;
 985         }
 986         list_del(&cdev->node);
 987         list_for_each_entry(tz, &thermal_tz_list, node) {
 988                 if (!tz->ops->unbind)
 989                         continue;
 990                 tz->ops->unbind(tz, cdev);
 991         }
 992         mutex_unlock(&thermal_list_lock);
 993         if (cdev->type[0])
 994                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
 995         device_remove_file(&cdev->device, &dev_attr_max_state);
 996         device_remove_file(&cdev->device, &dev_attr_cur_state);
 997
 998         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 999         device_unregister(&cdev->device);
1000         return;
1001 }
1002 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1003
1004 /**
1005  * thermal_zone_device_update - force an update of a thermal zone's state
1006  * @ttz:        the thermal zone to update
1007  */
1008
1009 void thermal_zone_device_update(struct thermal_zone_device *tz)
1010 {
1011         int count, ret = 0;
1012         long temp, trip_temp;
1013         enum thermal_trip_type trip_type;
1014         struct thermal_cooling_device_instance *instance;
1015         struct thermal_cooling_device *cdev;
1016
1017         mutex_lock(&tz->lock);
1018
1019         if (tz->ops->get_temp(tz, &temp)) {
1020                 /* get_temp failed - retry it later */
1021                 pr_warn("failed to read out thermal zone %d\n", tz->id);
1022                 goto leave;
1023         }
1024
1025         for (count = 0; count < tz->trips; count++) {
1026                 tz->ops->get_trip_type(tz, count, &trip_type);
1027                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1028
1029                 switch (trip_type) {
1030                 case THERMAL_TRIP_CRITICAL:
1031                         if (temp >= trip_temp) {
1032                                 if (tz->ops->notify)
1033                                         ret = tz->ops->notify(tz, count,
1034                                                               trip_type);
1035                                 if (!ret) {
1036                                         pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1037                                                  temp/1000);
1038                                         orderly_poweroff(true);
1039                                 }
1040                         }
1041                         break;
1042                 case THERMAL_TRIP_HOT:
1043                         if (temp >= trip_temp)
1044                                 if (tz->ops->notify)
1045                                         tz->ops->notify(tz, count, trip_type);
1046                         break;
1047                 case THERMAL_TRIP_ACTIVE:
1048                         list_for_each_entry(instance, &tz->cooling_devices,
1049                                             node) {
1050                                 if (instance->trip != count)
1051                                         continue;
1052
1053                                 cdev = instance->cdev;
1054
1055                                 if (temp >= trip_temp)
1056                                         cdev->ops->set_cur_state(cdev, 1);
1057                                 else
1058                                         cdev->ops->set_cur_state(cdev, 0);
1059                         }
1060                         break;
1061                 case THERMAL_TRIP_PASSIVE:
1062                         if (temp >= trip_temp || tz->passive)
1063                                 thermal_zone_device_passive(tz, temp,
1064                                                             trip_temp, count);
1065                         break;
1066                 }
1067         }
1068
1069         if (tz->forced_passive)
1070                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1071                                             THERMAL_TRIPS_NONE);
1072
1073         tz->last_temperature = temp;
1074
1075 leave:
1076         if (tz->passive)
1077                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1078         else if (tz->polling_delay)
1079                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1080         else
1081                 thermal_zone_device_set_polling(tz, 0);
1082         mutex_unlock(&tz->lock);
1083 }
1084 EXPORT_SYMBOL(thermal_zone_device_update);
1085
1086 /**
1087  * create_trip_attrs - create attributes for trip points
1088  * @tz:         the thermal zone device
1089  * @mask:       Writeable trip point bitmap.
1090  */
1091 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1092 {
1093         int indx;
1094
1095         tz->trip_type_attrs =
1096                 kzalloc(sizeof(struct thermal_attr) * tz->trips, GFP_KERNEL);
1097         if (!tz->trip_type_attrs)
1098                 return -ENOMEM;
1099
1100         tz->trip_temp_attrs =
1101                 kzalloc(sizeof(struct thermal_attr) * tz->trips, GFP_KERNEL);
1102         if (!tz->trip_temp_attrs) {
1103                 kfree(tz->trip_type_attrs);
1104                 return -ENOMEM;
1105         }
1106
1107         for (indx = 0; indx < tz->trips; indx++) {
1108
1109                 /* create trip type attribute */
1110                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1111                          "trip_point_%d_type", indx);
1112
1113                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1114                 tz->trip_type_attrs[indx].attr.attr.name =
1115                                                 tz->trip_type_attrs[indx].name;
1116                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1117                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1118
1119                 device_create_file(&tz->device,
1120                                    &tz->trip_type_attrs[indx].attr);
1121
1122                 /* create trip temp attribute */
1123                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1124                          "trip_point_%d_temp", indx);
1125
1126                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1127                 tz->trip_temp_attrs[indx].attr.attr.name =
1128                                                 tz->trip_temp_attrs[indx].name;
1129                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1130                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1131                 if (mask & (1 << indx)) {
1132                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1133                         tz->trip_temp_attrs[indx].attr.store =
1134                                                         trip_point_temp_store;
1135                 }
1136
1137                 device_create_file(&tz->device,
1138                                    &tz->trip_temp_attrs[indx].attr);
1139         }
1140         return 0;
1141 }
1142
1143 static void remove_trip_attrs(struct thermal_zone_device *tz)
1144 {
1145         int indx;
1146
1147         for (indx = 0; indx < tz->trips; indx++) {
1148                 device_remove_file(&tz->device,
1149                                    &tz->trip_type_attrs[indx].attr);
1150                 device_remove_file(&tz->device,
1151                                    &tz->trip_temp_attrs[indx].attr);
1152         }
1153         kfree(tz->trip_type_attrs);
1154         kfree(tz->trip_temp_attrs);
1155 }
1156
1157 /**
1158  * thermal_zone_device_register - register a new thermal zone device
1159  * @type:       the thermal zone device type
1160  * @trips:      the number of trip points the thermal zone support
1161  * @mask:       a bit string indicating the writeablility of trip points
1162  * @devdata:    private device data
1163  * @ops:        standard thermal zone device callbacks
1164  * @tc1:        thermal coefficient 1 for passive calculations
1165  * @tc2:        thermal coefficient 2 for passive calculations
1166  * @passive_delay: number of milliseconds to wait between polls when
1167  *                 performing passive cooling
1168  * @polling_delay: number of milliseconds to wait between polls when checking
1169  *                 whether trip points have been crossed (0 for interrupt
1170  *                 driven systems)
1171  *
1172  * thermal_zone_device_unregister() must be called when the device is no
1173  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1174  * section 11.1.5.1 of the ACPI specification 3.0.
1175  */
1176 struct thermal_zone_device *thermal_zone_device_register(char *type,
1177         int trips, int mask, void *devdata,
1178         const struct thermal_zone_device_ops *ops,
1179         int tc1, int tc2, int passive_delay, int polling_delay)
1180 {
1181         struct thermal_zone_device *tz;
1182         struct thermal_cooling_device *pos;
1183         enum thermal_trip_type trip_type;
1184         int result;
1185         int count;
1186         int passive = 0;
1187
1188         if (strlen(type) >= THERMAL_NAME_LENGTH)
1189                 return ERR_PTR(-EINVAL);
1190
1191         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1192                 return ERR_PTR(-EINVAL);
1193
1194         if (!ops || !ops->get_temp)
1195                 return ERR_PTR(-EINVAL);
1196
1197         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1198         if (!tz)
1199                 return ERR_PTR(-ENOMEM);
1200
1201         INIT_LIST_HEAD(&tz->cooling_devices);
1202         idr_init(&tz->idr);
1203         mutex_init(&tz->lock);
1204         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1205         if (result) {
1206                 kfree(tz);
1207                 return ERR_PTR(result);
1208         }
1209
1210         strcpy(tz->type, type);
1211         tz->ops = ops;
1212         tz->device.class = &thermal_class;
1213         tz->devdata = devdata;
1214         tz->trips = trips;
1215         tz->tc1 = tc1;
1216         tz->tc2 = tc2;
1217         tz->passive_delay = passive_delay;
1218         tz->polling_delay = polling_delay;
1219
1220         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1221         result = device_register(&tz->device);
1222         if (result) {
1223                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1224                 kfree(tz);
1225                 return ERR_PTR(result);
1226         }
1227
1228         /* sys I/F */
1229         if (type) {
1230                 result = device_create_file(&tz->device, &dev_attr_type);
1231                 if (result)
1232                         goto unregister;
1233         }
1234
1235         result = device_create_file(&tz->device, &dev_attr_temp);
1236         if (result)
1237                 goto unregister;
1238
1239         if (ops->get_mode) {
1240                 result = device_create_file(&tz->device, &dev_attr_mode);
1241                 if (result)
1242                         goto unregister;
1243         }
1244
1245         result = create_trip_attrs(tz, mask);
1246         if (result)
1247                 goto unregister;
1248
1249         for (count = 0; count < trips; count++) {
1250                 tz->ops->get_trip_type(tz, count, &trip_type);
1251                 if (trip_type == THERMAL_TRIP_PASSIVE)
1252                         passive = 1;
1253         }
1254
1255         if (!passive)
1256                 result = device_create_file(&tz->device,
1257                                             &dev_attr_passive);
1258
1259         if (result)
1260                 goto unregister;
1261
1262         result = thermal_add_hwmon_sysfs(tz);
1263         if (result)
1264                 goto unregister;
1265
1266         mutex_lock(&thermal_list_lock);
1267         list_add_tail(&tz->node, &thermal_tz_list);
1268         if (ops->bind)
1269                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1270                 result = ops->bind(tz, pos);
1271                 if (result)
1272                         break;
1273                 }
1274         mutex_unlock(&thermal_list_lock);
1275
1276         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1277
1278         thermal_zone_device_update(tz);
1279
1280         if (!result)
1281                 return tz;
1282
1283 unregister:
1284         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1285         device_unregister(&tz->device);
1286         return ERR_PTR(result);
1287 }
1288 EXPORT_SYMBOL(thermal_zone_device_register);
1289
1290 /**
1291  * thermal_device_unregister - removes the registered thermal zone device
1292  * @tz: the thermal zone device to remove
1293  */
1294 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1295 {
1296         struct thermal_cooling_device *cdev;
1297         struct thermal_zone_device *pos = NULL;
1298
1299         if (!tz)
1300                 return;
1301
1302         mutex_lock(&thermal_list_lock);
1303         list_for_each_entry(pos, &thermal_tz_list, node)
1304             if (pos == tz)
1305                 break;
1306         if (pos != tz) {
1307                 /* thermal zone device not found */
1308                 mutex_unlock(&thermal_list_lock);
1309                 return;
1310         }
1311         list_del(&tz->node);
1312         if (tz->ops->unbind)
1313                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1314                     tz->ops->unbind(tz, cdev);
1315         mutex_unlock(&thermal_list_lock);
1316
1317         thermal_zone_device_set_polling(tz, 0);
1318
1319         if (tz->type[0])
1320                 device_remove_file(&tz->device, &dev_attr_type);
1321         device_remove_file(&tz->device, &dev_attr_temp);
1322         if (tz->ops->get_mode)
1323                 device_remove_file(&tz->device, &dev_attr_mode);
1324         remove_trip_attrs(tz);
1325
1326         thermal_remove_hwmon_sysfs(tz);
1327         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1328         idr_destroy(&tz->idr);
1329         mutex_destroy(&tz->lock);
1330         device_unregister(&tz->device);
1331         return;
1332 }
1333 EXPORT_SYMBOL(thermal_zone_device_unregister);
1334
1335 #ifdef CONFIG_NET
1336 static struct genl_family thermal_event_genl_family = {
1337         .id = GENL_ID_GENERATE,
1338         .name = THERMAL_GENL_FAMILY_NAME,
1339         .version = THERMAL_GENL_VERSION,
1340         .maxattr = THERMAL_GENL_ATTR_MAX,
1341 };
1342
1343 static struct genl_multicast_group thermal_event_mcgrp = {
1344         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1345 };
1346
1347 int thermal_generate_netlink_event(u32 orig, enum events event)
1348 {
1349         struct sk_buff *skb;
1350         struct nlattr *attr;
1351         struct thermal_genl_event *thermal_event;
1352         void *msg_header;
1353         int size;
1354         int result;
1355         static unsigned int thermal_event_seqnum;
1356
1357         /* allocate memory */
1358         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1359                nla_total_size(0);
1360
1361         skb = genlmsg_new(size, GFP_ATOMIC);
1362         if (!skb)
1363                 return -ENOMEM;
1364
1365         /* add the genetlink message header */
1366         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1367                                  &thermal_event_genl_family, 0,
1368                                  THERMAL_GENL_CMD_EVENT);
1369         if (!msg_header) {
1370                 nlmsg_free(skb);
1371                 return -ENOMEM;
1372         }
1373
1374         /* fill the data */
1375         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1376                            sizeof(struct thermal_genl_event));
1377
1378         if (!attr) {
1379                 nlmsg_free(skb);
1380                 return -EINVAL;
1381         }
1382
1383         thermal_event = nla_data(attr);
1384         if (!thermal_event) {
1385                 nlmsg_free(skb);
1386                 return -EINVAL;
1387         }
1388
1389         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1390
1391         thermal_event->orig = orig;
1392         thermal_event->event = event;
1393
1394         /* send multicast genetlink message */
1395         result = genlmsg_end(skb, msg_header);
1396         if (result < 0) {
1397                 nlmsg_free(skb);
1398                 return result;
1399         }
1400
1401         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1402         if (result)
1403                 pr_info("failed to send netlink event:%d\n", result);
1404
1405         return result;
1406 }
1407 EXPORT_SYMBOL(thermal_generate_netlink_event);
1408
1409 static int genetlink_init(void)
1410 {
1411         int result;
1412
1413         result = genl_register_family(&thermal_event_genl_family);
1414         if (result)
1415                 return result;
1416
1417         result = genl_register_mc_group(&thermal_event_genl_family,
1418                                         &thermal_event_mcgrp);
1419         if (result)
1420                 genl_unregister_family(&thermal_event_genl_family);
1421         return result;
1422 }
1423
1424 static void genetlink_exit(void)
1425 {
1426         genl_unregister_family(&thermal_event_genl_family);
1427 }
1428 #else /* !CONFIG_NET */
1429 static inline int genetlink_init(void) { return 0; }
1430 static inline void genetlink_exit(void) {}
1431 #endif /* !CONFIG_NET */
1432
1433 static int __init thermal_init(void)
1434 {
1435         int result = 0;
1436
1437         result = class_register(&thermal_class);
1438         if (result) {
1439                 idr_destroy(&thermal_tz_idr);
1440                 idr_destroy(&thermal_cdev_idr);
1441                 mutex_destroy(&thermal_idr_lock);
1442                 mutex_destroy(&thermal_list_lock);
1443         }
1444         result = genetlink_init();
1445         return result;
1446 }
1447
1448 static void __exit thermal_exit(void)
1449 {
1450         class_unregister(&thermal_class);
1451         idr_destroy(&thermal_tz_idr);
1452         idr_destroy(&thermal_cdev_idr);
1453         mutex_destroy(&thermal_idr_lock);
1454         mutex_destroy(&thermal_list_lock);
1455         genetlink_exit();
1456 }
1457
1458 fs_initcall(thermal_init);
1459 module_exit(thermal_exit);