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 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")))
 154                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 155         else if (!strncmp(buf, "disabled", sizeof("disabled")))
 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_show(struct device *dev, struct device_attribute *attr,
 200                      char *buf)
 201 {
 202         struct thermal_zone_device *tz = to_thermal_zone(dev);
 203         int trip, ret;
 204         long temperature;
 205
 206         if (!tz->ops->get_trip_temp)
 207                 return -EPERM;
 208
 209         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 210                 return -EINVAL;
 211
 212         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 213
 214         if (ret)
 215                 return ret;
 216
 217         return sprintf(buf, "%ld\n", temperature);
 218 }
 219
 220 static ssize_t
 221 passive_store(struct device *dev, struct device_attribute *attr,
 222                     const char *buf, size_t count)
 223 {
 224         struct thermal_zone_device *tz = to_thermal_zone(dev);
 225         struct thermal_cooling_device *cdev = NULL;
 226         int state;
 227
 228         if (!sscanf(buf, "%d\n", &state))
 229                 return -EINVAL;
 230
 231         /* sanity check: values below 1000 millicelcius don't make sense
 232          * and can cause the system to go into a thermal heart attack
 233          */
 234         if (state && state < 1000)
 235                 return -EINVAL;
 236
 237         if (state && !tz->forced_passive) {
 238                 mutex_lock(&thermal_list_lock);
 239                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 240                         if (!strncmp("Processor", cdev->type,
 241                                      sizeof("Processor")))
 242                                 thermal_zone_bind_cooling_device(tz,
 243                                                                  THERMAL_TRIPS_NONE,
 244                                                                  cdev);
 245                 }
 246                 mutex_unlock(&thermal_list_lock);
 247                 if (!tz->passive_delay)
 248                         tz->passive_delay = 1000;
 249         } else if (!state && tz->forced_passive) {
 250                 mutex_lock(&thermal_list_lock);
 251                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 252                         if (!strncmp("Processor", cdev->type,
 253                                      sizeof("Processor")))
 254                                 thermal_zone_unbind_cooling_device(tz,
 255                                                                    THERMAL_TRIPS_NONE,
 256                                                                    cdev);
 257                 }
 258                 mutex_unlock(&thermal_list_lock);
 259                 tz->passive_delay = 0;
 260         }
 261
 262         tz->tc1 = 1;
 263         tz->tc2 = 1;
 264
 265         tz->forced_passive = state;
 266
 267         thermal_zone_device_update(tz);
 268
 269         return count;
 270 }
 271
 272 static ssize_t
 273 passive_show(struct device *dev, struct device_attribute *attr,
 274                    char *buf)
 275 {
 276         struct thermal_zone_device *tz = to_thermal_zone(dev);
 277
 278         return sprintf(buf, "%d\n", tz->forced_passive);
 279 }
 280
 281 static DEVICE_ATTR(type, 0444, type_show, NULL);
 282 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 283 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 284 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
 285                    passive_store);
 286
 287 static struct device_attribute trip_point_attrs[] = {
 288         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 289         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 290         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 291         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 292         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 293         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 294         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 295         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 296         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 297         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 298         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 299         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 300         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 301         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 302         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 303         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 304         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 305         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 306         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 307         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 308         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
 309         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
 310         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
 311         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
 312 };
 313
 314 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 315 do {    \
 316         result = device_create_file(_dev,       \
 317                                 &trip_point_attrs[_index * 2]); \
 318         if (result)     \
 319                 break;  \
 320         result = device_create_file(_dev,       \
 321                         &trip_point_attrs[_index * 2 + 1]);     \
 322 } while (0)
 323
 324 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 325 do {    \
 326         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 327         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 328 } while (0)
 329
 330 /* sys I/F for cooling device */
 331 #define to_cooling_device(_dev) \
 332         container_of(_dev, struct thermal_cooling_device, device)
 333
 334 static ssize_t
 335 thermal_cooling_device_type_show(struct device *dev,
 336                                  struct device_attribute *attr, char *buf)
 337 {
 338         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 339
 340         return sprintf(buf, "%s\n", cdev->type);
 341 }
 342
 343 static ssize_t
 344 thermal_cooling_device_max_state_show(struct device *dev,
 345                                       struct device_attribute *attr, char *buf)
 346 {
 347         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 348         unsigned long state;
 349         int ret;
 350
 351         ret = cdev->ops->get_max_state(cdev, &state);
 352         if (ret)
 353                 return ret;
 354         return sprintf(buf, "%ld\n", state);
 355 }
 356
 357 static ssize_t
 358 thermal_cooling_device_cur_state_show(struct device *dev,
 359                                       struct device_attribute *attr, char *buf)
 360 {
 361         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 362         unsigned long state;
 363         int ret;
 364
 365         ret = cdev->ops->get_cur_state(cdev, &state);
 366         if (ret)
 367                 return ret;
 368         return sprintf(buf, "%ld\n", state);
 369 }
 370
 371 static ssize_t
 372 thermal_cooling_device_cur_state_store(struct device *dev,
 373                                        struct device_attribute *attr,
 374                                        const char *buf, size_t count)
 375 {
 376         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 377         unsigned long state;
 378         int result;
 379
 380         if (!sscanf(buf, "%ld\n", &state))
 381                 return -EINVAL;
 382
 383         if ((long)state < 0)
 384                 return -EINVAL;
 385
 386         result = cdev->ops->set_cur_state(cdev, state);
 387         if (result)
 388                 return result;
 389         return count;
 390 }
 391
 392 static struct device_attribute dev_attr_cdev_type =
 393 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 394 static DEVICE_ATTR(max_state, 0444,
 395                    thermal_cooling_device_max_state_show, NULL);
 396 static DEVICE_ATTR(cur_state, 0644,
 397                    thermal_cooling_device_cur_state_show,
 398                    thermal_cooling_device_cur_state_store);
 399
 400 static ssize_t
 401 thermal_cooling_device_trip_point_show(struct device *dev,
 402                                        struct device_attribute *attr, char *buf)
 403 {
 404         struct thermal_cooling_device_instance *instance;
 405
 406         instance =
 407             container_of(attr, struct thermal_cooling_device_instance, attr);
 408
 409         if (instance->trip == THERMAL_TRIPS_NONE)
 410                 return sprintf(buf, "-1\n");
 411         else
 412                 return sprintf(buf, "%d\n", instance->trip);
 413 }
 414
 415 /* Device management */
 416
 417 #if defined(CONFIG_THERMAL_HWMON)
 418
 419 /* hwmon sys I/F */
 420 #include <linux/hwmon.h>
 421
 422 /* thermal zone devices with the same type share one hwmon device */
 423 struct thermal_hwmon_device {
 424         char type[THERMAL_NAME_LENGTH];
 425         struct device *device;
 426         int count;
 427         struct list_head tz_list;
 428         struct list_head node;
 429 };
 430
 431 struct thermal_hwmon_attr {
 432         struct device_attribute attr;
 433         char name[16];
 434 };
 435
 436 /* one temperature input for each thermal zone */
 437 struct thermal_hwmon_temp {
 438         struct list_head hwmon_node;
 439         struct thermal_zone_device *tz;
 440         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 441         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 442 };
 443
 444 static LIST_HEAD(thermal_hwmon_list);
 445
 446 static ssize_t
 447 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 448 {
 449         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 450         return sprintf(buf, "%s\n", hwmon->type);
 451 }
 452 static DEVICE_ATTR(name, 0444, name_show, NULL);
 453
 454 static ssize_t
 455 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 456 {
 457         long temperature;
 458         int ret;
 459         struct thermal_hwmon_attr *hwmon_attr
 460                         = container_of(attr, struct thermal_hwmon_attr, attr);
 461         struct thermal_hwmon_temp *temp
 462                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 463                                        temp_input);
 464         struct thermal_zone_device *tz = temp->tz;
 465
 466         ret = tz->ops->get_temp(tz, &temperature);
 467
 468         if (ret)
 469                 return ret;
 470
 471         return sprintf(buf, "%ld\n", temperature);
 472 }
 473
 474 static ssize_t
 475 temp_crit_show(struct device *dev, struct device_attribute *attr,
 476                 char *buf)
 477 {
 478         struct thermal_hwmon_attr *hwmon_attr
 479                         = container_of(attr, struct thermal_hwmon_attr, attr);
 480         struct thermal_hwmon_temp *temp
 481                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 482                                        temp_crit);
 483         struct thermal_zone_device *tz = temp->tz;
 484         long temperature;
 485         int ret;
 486
 487         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 488         if (ret)
 489                 return ret;
 490
 491         return sprintf(buf, "%ld\n", temperature);
 492 }
 493
 494
 495 static struct thermal_hwmon_device *
 496 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 497 {
 498         struct thermal_hwmon_device *hwmon;
 499
 500         mutex_lock(&thermal_list_lock);
 501         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 502                 if (!strcmp(hwmon->type, tz->type)) {
 503                         mutex_unlock(&thermal_list_lock);
 504                         return hwmon;
 505                 }
 506         mutex_unlock(&thermal_list_lock);
 507
 508         return NULL;
 509 }
 510
 511 /* Find the temperature input matching a given thermal zone */
 512 static struct thermal_hwmon_temp *
 513 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 514                           const struct thermal_zone_device *tz)
 515 {
 516         struct thermal_hwmon_temp *temp;
 517
 518         mutex_lock(&thermal_list_lock);
 519         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 520                 if (temp->tz == tz) {
 521                         mutex_unlock(&thermal_list_lock);
 522                         return temp;
 523                 }
 524         mutex_unlock(&thermal_list_lock);
 525
 526         return NULL;
 527 }
 528
 529 static int
 530 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 531 {
 532         struct thermal_hwmon_device *hwmon;
 533         struct thermal_hwmon_temp *temp;
 534         int new_hwmon_device = 1;
 535         int result;
 536
 537         hwmon = thermal_hwmon_lookup_by_type(tz);
 538         if (hwmon) {
 539                 new_hwmon_device = 0;
 540                 goto register_sys_interface;
 541         }
 542
 543         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 544         if (!hwmon)
 545                 return -ENOMEM;
 546
 547         INIT_LIST_HEAD(&hwmon->tz_list);
 548         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 549         hwmon->device = hwmon_device_register(NULL);
 550         if (IS_ERR(hwmon->device)) {
 551                 result = PTR_ERR(hwmon->device);
 552                 goto free_mem;
 553         }
 554         dev_set_drvdata(hwmon->device, hwmon);
 555         result = device_create_file(hwmon->device, &dev_attr_name);
 556         if (result)
 557                 goto free_mem;
 558
 559  register_sys_interface:
 560         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 561         if (!temp) {
 562                 result = -ENOMEM;
 563                 goto unregister_name;
 564         }
 565
 566         temp->tz = tz;
 567         hwmon->count++;
 568
 569         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
 570                  "temp%d_input", hwmon->count);
 571         temp->temp_input.attr.attr.name = temp->temp_input.name;
 572         temp->temp_input.attr.attr.mode = 0444;
 573         temp->temp_input.attr.show = temp_input_show;
 574         sysfs_attr_init(&temp->temp_input.attr.attr);
 575         result = device_create_file(hwmon->device, &temp->temp_input.attr);
 576         if (result)
 577                 goto free_temp_mem;
 578
 579         if (tz->ops->get_crit_temp) {
 580                 unsigned long temperature;
 581                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 582                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
 583                                 "temp%d_crit", hwmon->count);
 584                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 585                         temp->temp_crit.attr.attr.mode = 0444;
 586                         temp->temp_crit.attr.show = temp_crit_show;
 587                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 588                         result = device_create_file(hwmon->device,
 589                                                     &temp->temp_crit.attr);
 590                         if (result)
 591                                 goto unregister_input;
 592                 }
 593         }
 594
 595         mutex_lock(&thermal_list_lock);
 596         if (new_hwmon_device)
 597                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 598         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 599         mutex_unlock(&thermal_list_lock);
 600
 601         return 0;
 602
 603  unregister_input:
 604         device_remove_file(hwmon->device, &temp->temp_input.attr);
 605  free_temp_mem:
 606         kfree(temp);
 607  unregister_name:
 608         if (new_hwmon_device) {
 609                 device_remove_file(hwmon->device, &dev_attr_name);
 610                 hwmon_device_unregister(hwmon->device);
 611         }
 612  free_mem:
 613         if (new_hwmon_device)
 614                 kfree(hwmon);
 615
 616         return result;
 617 }
 618
 619 static void
 620 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 621 {
 622         struct thermal_hwmon_device *hwmon;
 623         struct thermal_hwmon_temp *temp;
 624
 625         hwmon = thermal_hwmon_lookup_by_type(tz);
 626         if (unlikely(!hwmon)) {
 627                 /* Should never happen... */
 628                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 629                 return;
 630         }
 631
 632         temp = thermal_hwmon_lookup_temp(hwmon, tz);
 633         if (unlikely(!temp)) {
 634                 /* Should never happen... */
 635                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
 636                 return;
 637         }
 638
 639         device_remove_file(hwmon->device, &temp->temp_input.attr);
 640         if (tz->ops->get_crit_temp)
 641                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
 642
 643         mutex_lock(&thermal_list_lock);
 644         list_del(&temp->hwmon_node);
 645         kfree(temp);
 646         if (!list_empty(&hwmon->tz_list)) {
 647                 mutex_unlock(&thermal_list_lock);
 648                 return;
 649         }
 650         list_del(&hwmon->node);
 651         mutex_unlock(&thermal_list_lock);
 652
 653         device_remove_file(hwmon->device, &dev_attr_name);
 654         hwmon_device_unregister(hwmon->device);
 655         kfree(hwmon);
 656 }
 657 #else
 658 static int
 659 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 660 {
 661         return 0;
 662 }
 663
 664 static void
 665 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 666 {
 667 }
 668 #endif
 669
 670 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 671                                             int delay)
 672 {
 673         cancel_delayed_work(&(tz->poll_queue));
 674
 675         if (!delay)
 676                 return;
 677
 678         if (delay > 1000)
 679                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 680                                       round_jiffies(msecs_to_jiffies(delay)));
 681         else
 682                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 683                                       msecs_to_jiffies(delay));
 684 }
 685
 686 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 687                                         int temp, int trip_temp, int trip)
 688 {
 689         int trend = 0;
 690         struct thermal_cooling_device_instance *instance;
 691         struct thermal_cooling_device *cdev;
 692         long state, max_state;
 693
 694         /*
 695          * Above Trip?
 696          * -----------
 697          * Calculate the thermal trend (using the passive cooling equation)
 698          * and modify the performance limit for all passive cooling devices
 699          * accordingly.  Note that we assume symmetry.
 700          */
 701         if (temp >= trip_temp) {
 702                 tz->passive = true;
 703
 704                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 705                         (tz->tc2 * (temp - trip_temp));
 706
 707                 /* Heating up? */
 708                 if (trend > 0) {
 709                         list_for_each_entry(instance, &tz->cooling_devices,
 710                                             node) {
 711                                 if (instance->trip != trip)
 712                                         continue;
 713                                 cdev = instance->cdev;
 714                                 cdev->ops->get_cur_state(cdev, &state);
 715                                 cdev->ops->get_max_state(cdev, &max_state);
 716                                 if (state++ < max_state)
 717                                         cdev->ops->set_cur_state(cdev, state);
 718                         }
 719                 } else if (trend < 0) { /* Cooling off? */
 720                         list_for_each_entry(instance, &tz->cooling_devices,
 721                                             node) {
 722                                 if (instance->trip != trip)
 723                                         continue;
 724                                 cdev = instance->cdev;
 725                                 cdev->ops->get_cur_state(cdev, &state);
 726                                 cdev->ops->get_max_state(cdev, &max_state);
 727                                 if (state > 0)
 728                                         cdev->ops->set_cur_state(cdev, --state);
 729                         }
 730                 }
 731                 return;
 732         }
 733
 734         /*
 735          * Below Trip?
 736          * -----------
 737          * Implement passive cooling hysteresis to slowly increase performance
 738          * and avoid thrashing around the passive trip point.  Note that we
 739          * assume symmetry.
 740          */
 741         list_for_each_entry(instance, &tz->cooling_devices, node) {
 742                 if (instance->trip != trip)
 743                         continue;
 744                 cdev = instance->cdev;
 745                 cdev->ops->get_cur_state(cdev, &state);
 746                 cdev->ops->get_max_state(cdev, &max_state);
 747                 if (state > 0)
 748                         cdev->ops->set_cur_state(cdev, --state);
 749                 if (state == 0)
 750                         tz->passive = false;
 751         }
 752 }
 753
 754 static void thermal_zone_device_check(struct work_struct *work)
 755 {
 756         struct thermal_zone_device *tz = container_of(work, struct
 757                                                       thermal_zone_device,
 758                                                       poll_queue.work);
 759         thermal_zone_device_update(tz);
 760 }
 761
 762 /**
 763  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 764  * @tz:         thermal zone device
 765  * @trip:       indicates which trip point the cooling devices is
 766  *              associated with in this thermal zone.
 767  * @cdev:       thermal cooling device
 768  *
 769  * This function is usually called in the thermal zone device .bind callback.
 770  */
 771 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 772                                      int trip,
 773                                      struct thermal_cooling_device *cdev)
 774 {
 775         struct thermal_cooling_device_instance *dev;
 776         struct thermal_cooling_device_instance *pos;
 777         struct thermal_zone_device *pos1;
 778         struct thermal_cooling_device *pos2;
 779         int result;
 780
 781         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 782                 return -EINVAL;
 783
 784         list_for_each_entry(pos1, &thermal_tz_list, node) {
 785                 if (pos1 == tz)
 786                         break;
 787         }
 788         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 789                 if (pos2 == cdev)
 790                         break;
 791         }
 792
 793         if (tz != pos1 || cdev != pos2)
 794                 return -EINVAL;
 795
 796         dev =
 797             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 798         if (!dev)
 799                 return -ENOMEM;
 800         dev->tz = tz;
 801         dev->cdev = cdev;
 802         dev->trip = trip;
 803         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 804         if (result)
 805                 goto free_mem;
 806
 807         sprintf(dev->name, "cdev%d", dev->id);
 808         result =
 809             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 810         if (result)
 811                 goto release_idr;
 812
 813         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 814         sysfs_attr_init(&dev->attr.attr);
 815         dev->attr.attr.name = dev->attr_name;
 816         dev->attr.attr.mode = 0444;
 817         dev->attr.show = thermal_cooling_device_trip_point_show;
 818         result = device_create_file(&tz->device, &dev->attr);
 819         if (result)
 820                 goto remove_symbol_link;
 821
 822         mutex_lock(&tz->lock);
 823         list_for_each_entry(pos, &tz->cooling_devices, node)
 824             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 825                 result = -EEXIST;
 826                 break;
 827         }
 828         if (!result)
 829                 list_add_tail(&dev->node, &tz->cooling_devices);
 830         mutex_unlock(&tz->lock);
 831
 832         if (!result)
 833                 return 0;
 834
 835         device_remove_file(&tz->device, &dev->attr);
 836       remove_symbol_link:
 837         sysfs_remove_link(&tz->device.kobj, dev->name);
 838       release_idr:
 839         release_idr(&tz->idr, &tz->lock, dev->id);
 840       free_mem:
 841         kfree(dev);
 842         return result;
 843 }
 844
 845 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 846
 847 /**
 848  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 849  * @tz:         thermal zone device
 850  * @trip:       indicates which trip point the cooling devices is
 851  *              associated with in this thermal zone.
 852  * @cdev:       thermal cooling device
 853  *
 854  * This function is usually called in the thermal zone device .unbind callback.
 855  */
 856 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 857                                        int trip,
 858                                        struct thermal_cooling_device *cdev)
 859 {
 860         struct thermal_cooling_device_instance *pos, *next;
 861
 862         mutex_lock(&tz->lock);
 863         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 864                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 865                         list_del(&pos->node);
 866                         mutex_unlock(&tz->lock);
 867                         goto unbind;
 868                 }
 869         }
 870         mutex_unlock(&tz->lock);
 871
 872         return -ENODEV;
 873
 874       unbind:
 875         device_remove_file(&tz->device, &pos->attr);
 876         sysfs_remove_link(&tz->device.kobj, pos->name);
 877         release_idr(&tz->idr, &tz->lock, pos->id);
 878         kfree(pos);
 879         return 0;
 880 }
 881
 882 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 883
 884 static void thermal_release(struct device *dev)
 885 {
 886         struct thermal_zone_device *tz;
 887         struct thermal_cooling_device *cdev;
 888
 889         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
 890                 tz = to_thermal_zone(dev);
 891                 kfree(tz);
 892         } else {
 893                 cdev = to_cooling_device(dev);
 894                 kfree(cdev);
 895         }
 896 }
 897
 898 static struct class thermal_class = {
 899         .name = "thermal",
 900         .dev_release = thermal_release,
 901 };
 902
 903 /**
 904  * thermal_cooling_device_register - register a new thermal cooling device
 905  * @type:       the thermal cooling device type.
 906  * @devdata:    device private data.
 907  * @ops:                standard thermal cooling devices callbacks.
 908  */
 909 struct thermal_cooling_device *thermal_cooling_device_register(
 910      char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 911 {
 912         struct thermal_cooling_device *cdev;
 913         struct thermal_zone_device *pos;
 914         int result;
 915
 916         if (strlen(type) >= THERMAL_NAME_LENGTH)
 917                 return ERR_PTR(-EINVAL);
 918
 919         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 920             !ops->set_cur_state)
 921                 return ERR_PTR(-EINVAL);
 922
 923         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 924         if (!cdev)
 925                 return ERR_PTR(-ENOMEM);
 926
 927         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 928         if (result) {
 929                 kfree(cdev);
 930                 return ERR_PTR(result);
 931         }
 932
 933         strcpy(cdev->type, type);
 934         cdev->ops = ops;
 935         cdev->device.class = &thermal_class;
 936         cdev->devdata = devdata;
 937         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 938         result = device_register(&cdev->device);
 939         if (result) {
 940                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 941                 kfree(cdev);
 942                 return ERR_PTR(result);
 943         }
 944
 945         /* sys I/F */
 946         if (type) {
 947                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 948                 if (result)
 949                         goto unregister;
 950         }
 951
 952         result = device_create_file(&cdev->device, &dev_attr_max_state);
 953         if (result)
 954                 goto unregister;
 955
 956         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 957         if (result)
 958                 goto unregister;
 959
 960         mutex_lock(&thermal_list_lock);
 961         list_add(&cdev->node, &thermal_cdev_list);
 962         list_for_each_entry(pos, &thermal_tz_list, node) {
 963                 if (!pos->ops->bind)
 964                         continue;
 965                 result = pos->ops->bind(pos, cdev);
 966                 if (result)
 967                         break;
 968
 969         }
 970         mutex_unlock(&thermal_list_lock);
 971
 972         if (!result)
 973                 return cdev;
 974
 975       unregister:
 976         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 977         device_unregister(&cdev->device);
 978         return ERR_PTR(result);
 979 }
 980
 981 EXPORT_SYMBOL(thermal_cooling_device_register);
 982
 983 /**
 984  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 985  * @cdev:       the thermal cooling device to remove.
 986  *
 987  * thermal_cooling_device_unregister() must be called when the device is no
 988  * longer needed.
 989  */
 990 void thermal_cooling_device_unregister(struct
 991                                        thermal_cooling_device
 992                                        *cdev)
 993 {
 994         struct thermal_zone_device *tz;
 995         struct thermal_cooling_device *pos = NULL;
 996
 997         if (!cdev)
 998                 return;
 999
1000         mutex_lock(&thermal_list_lock);
1001         list_for_each_entry(pos, &thermal_cdev_list, node)
1002             if (pos == cdev)
1003                 break;
1004         if (pos != cdev) {
1005                 /* thermal cooling device not found */
1006                 mutex_unlock(&thermal_list_lock);
1007                 return;
1008         }
1009         list_del(&cdev->node);
1010         list_for_each_entry(tz, &thermal_tz_list, node) {
1011                 if (!tz->ops->unbind)
1012                         continue;
1013                 tz->ops->unbind(tz, cdev);
1014         }
1015         mutex_unlock(&thermal_list_lock);
1016         if (cdev->type[0])
1017                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1018         device_remove_file(&cdev->device, &dev_attr_max_state);
1019         device_remove_file(&cdev->device, &dev_attr_cur_state);
1020
1021         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1022         device_unregister(&cdev->device);
1023         return;
1024 }
1025
1026 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1027
1028 /**
1029  * thermal_zone_device_update - force an update of a thermal zone's state
1030  * @ttz:        the thermal zone to update
1031  */
1032
1033 void thermal_zone_device_update(struct thermal_zone_device *tz)
1034 {
1035         int count, ret = 0;
1036         long temp, trip_temp;
1037         enum thermal_trip_type trip_type;
1038         struct thermal_cooling_device_instance *instance;
1039         struct thermal_cooling_device *cdev;
1040
1041         mutex_lock(&tz->lock);
1042
1043         if (tz->ops->get_temp(tz, &temp)) {
1044                 /* get_temp failed - retry it later */
1045                 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
1046                        "%d\n", tz->id);
1047                 goto leave;
1048         }
1049
1050         for (count = 0; count < tz->trips; count++) {
1051                 tz->ops->get_trip_type(tz, count, &trip_type);
1052                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1053
1054                 switch (trip_type) {
1055                 case THERMAL_TRIP_CRITICAL:
1056                         if (temp >= trip_temp) {
1057                                 if (tz->ops->notify)
1058                                         ret = tz->ops->notify(tz, count,
1059                                                               trip_type);
1060                                 if (!ret) {
1061                                         printk(KERN_EMERG
1062                                                "Critical temperature reached (%ld C), shutting down.\n",
1063                                                temp/1000);
1064                                         orderly_poweroff(true);
1065                                 }
1066                         }
1067                         break;
1068                 case THERMAL_TRIP_HOT:
1069                         if (temp >= trip_temp)
1070                                 if (tz->ops->notify)
1071                                         tz->ops->notify(tz, count, trip_type);
1072                         break;
1073                 case THERMAL_TRIP_ACTIVE:
1074                         list_for_each_entry(instance, &tz->cooling_devices,
1075                                             node) {
1076                                 if (instance->trip != count)
1077                                         continue;
1078
1079                                 cdev = instance->cdev;
1080
1081                                 if (temp >= trip_temp)
1082                                         cdev->ops->set_cur_state(cdev, 1);
1083                                 else
1084                                         cdev->ops->set_cur_state(cdev, 0);
1085                         }
1086                         break;
1087                 case THERMAL_TRIP_PASSIVE:
1088                         if (temp >= trip_temp || tz->passive)
1089                                 thermal_zone_device_passive(tz, temp,
1090                                                             trip_temp, count);
1091                         break;
1092                 }
1093         }
1094
1095         if (tz->forced_passive)
1096                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1097                                             THERMAL_TRIPS_NONE);
1098
1099         tz->last_temperature = temp;
1100
1101       leave:
1102         if (tz->passive)
1103                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1104         else if (tz->polling_delay)
1105                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1106         else
1107                 thermal_zone_device_set_polling(tz, 0);
1108         mutex_unlock(&tz->lock);
1109 }
1110 EXPORT_SYMBOL(thermal_zone_device_update);
1111
1112 /**
1113  * thermal_zone_device_register - register a new thermal zone device
1114  * @type:       the thermal zone device type
1115  * @trips:      the number of trip points the thermal zone support
1116  * @devdata:    private device data
1117  * @ops:        standard thermal zone device callbacks
1118  * @tc1:        thermal coefficient 1 for passive calculations
1119  * @tc2:        thermal coefficient 2 for passive calculations
1120  * @passive_delay: number of milliseconds to wait between polls when
1121  *                 performing passive cooling
1122  * @polling_delay: number of milliseconds to wait between polls when checking
1123  *                 whether trip points have been crossed (0 for interrupt
1124  *                 driven systems)
1125  *
1126  * thermal_zone_device_unregister() must be called when the device is no
1127  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1128  * section 11.1.5.1 of the ACPI specification 3.0.
1129  */
1130 struct thermal_zone_device *thermal_zone_device_register(char *type,
1131         int trips, void *devdata,
1132         const struct thermal_zone_device_ops *ops,
1133         int tc1, int tc2, int passive_delay, int polling_delay)
1134 {
1135         struct thermal_zone_device *tz;
1136         struct thermal_cooling_device *pos;
1137         enum thermal_trip_type trip_type;
1138         int result;
1139         int count;
1140         int passive = 0;
1141
1142         if (strlen(type) >= THERMAL_NAME_LENGTH)
1143                 return ERR_PTR(-EINVAL);
1144
1145         if (trips > THERMAL_MAX_TRIPS || trips < 0)
1146                 return ERR_PTR(-EINVAL);
1147
1148         if (!ops || !ops->get_temp)
1149                 return ERR_PTR(-EINVAL);
1150
1151         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1152         if (!tz)
1153                 return ERR_PTR(-ENOMEM);
1154
1155         INIT_LIST_HEAD(&tz->cooling_devices);
1156         idr_init(&tz->idr);
1157         mutex_init(&tz->lock);
1158         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1159         if (result) {
1160                 kfree(tz);
1161                 return ERR_PTR(result);
1162         }
1163
1164         strcpy(tz->type, type);
1165         tz->ops = ops;
1166         tz->device.class = &thermal_class;
1167         tz->devdata = devdata;
1168         tz->trips = trips;
1169         tz->tc1 = tc1;
1170         tz->tc2 = tc2;
1171         tz->passive_delay = passive_delay;
1172         tz->polling_delay = polling_delay;
1173
1174         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1175         result = device_register(&tz->device);
1176         if (result) {
1177                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1178                 kfree(tz);
1179                 return ERR_PTR(result);
1180         }
1181
1182         /* sys I/F */
1183         if (type) {
1184                 result = device_create_file(&tz->device, &dev_attr_type);
1185                 if (result)
1186                         goto unregister;
1187         }
1188
1189         result = device_create_file(&tz->device, &dev_attr_temp);
1190         if (result)
1191                 goto unregister;
1192
1193         if (ops->get_mode) {
1194                 result = device_create_file(&tz->device, &dev_attr_mode);
1195                 if (result)
1196                         goto unregister;
1197         }
1198
1199         for (count = 0; count < trips; count++) {
1200                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1201                 if (result)
1202                         goto unregister;
1203                 tz->ops->get_trip_type(tz, count, &trip_type);
1204                 if (trip_type == THERMAL_TRIP_PASSIVE)
1205                         passive = 1;
1206         }
1207
1208         if (!passive)
1209                 result = device_create_file(&tz->device,
1210                                             &dev_attr_passive);
1211
1212         if (result)
1213                 goto unregister;
1214
1215         result = thermal_add_hwmon_sysfs(tz);
1216         if (result)
1217                 goto unregister;
1218
1219         mutex_lock(&thermal_list_lock);
1220         list_add_tail(&tz->node, &thermal_tz_list);
1221         if (ops->bind)
1222                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1223                 result = ops->bind(tz, pos);
1224                 if (result)
1225                         break;
1226                 }
1227         mutex_unlock(&thermal_list_lock);
1228
1229         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1230
1231         thermal_zone_device_update(tz);
1232
1233         if (!result)
1234                 return tz;
1235
1236       unregister:
1237         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1238         device_unregister(&tz->device);
1239         return ERR_PTR(result);
1240 }
1241
1242 EXPORT_SYMBOL(thermal_zone_device_register);
1243
1244 /**
1245  * thermal_device_unregister - removes the registered thermal zone device
1246  * @tz: the thermal zone device to remove
1247  */
1248 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1249 {
1250         struct thermal_cooling_device *cdev;
1251         struct thermal_zone_device *pos = NULL;
1252         int count;
1253
1254         if (!tz)
1255                 return;
1256
1257         mutex_lock(&thermal_list_lock);
1258         list_for_each_entry(pos, &thermal_tz_list, node)
1259             if (pos == tz)
1260                 break;
1261         if (pos != tz) {
1262                 /* thermal zone device not found */
1263                 mutex_unlock(&thermal_list_lock);
1264                 return;
1265         }
1266         list_del(&tz->node);
1267         if (tz->ops->unbind)
1268                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1269                     tz->ops->unbind(tz, cdev);
1270         mutex_unlock(&thermal_list_lock);
1271
1272         thermal_zone_device_set_polling(tz, 0);
1273
1274         if (tz->type[0])
1275                 device_remove_file(&tz->device, &dev_attr_type);
1276         device_remove_file(&tz->device, &dev_attr_temp);
1277         if (tz->ops->get_mode)
1278                 device_remove_file(&tz->device, &dev_attr_mode);
1279
1280         for (count = 0; count < tz->trips; count++)
1281                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1282
1283         thermal_remove_hwmon_sysfs(tz);
1284         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1285         idr_destroy(&tz->idr);
1286         mutex_destroy(&tz->lock);
1287         device_unregister(&tz->device);
1288         return;
1289 }
1290
1291 EXPORT_SYMBOL(thermal_zone_device_unregister);
1292
1293 #ifdef CONFIG_NET
1294 static struct genl_family thermal_event_genl_family = {
1295         .id = GENL_ID_GENERATE,
1296         .name = THERMAL_GENL_FAMILY_NAME,
1297         .version = THERMAL_GENL_VERSION,
1298         .maxattr = THERMAL_GENL_ATTR_MAX,
1299 };
1300
1301 static struct genl_multicast_group thermal_event_mcgrp = {
1302         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1303 };
1304
1305 int thermal_generate_netlink_event(u32 orig, enum events event)
1306 {
1307         struct sk_buff *skb;
1308         struct nlattr *attr;
1309         struct thermal_genl_event *thermal_event;
1310         void *msg_header;
1311         int size;
1312         int result;
1313         static unsigned int thermal_event_seqnum;
1314
1315         /* allocate memory */
1316         size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1317                                 nla_total_size(0);
1318
1319         skb = genlmsg_new(size, GFP_ATOMIC);
1320         if (!skb)
1321                 return -ENOMEM;
1322
1323         /* add the genetlink message header */
1324         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1325                                  &thermal_event_genl_family, 0,
1326                                  THERMAL_GENL_CMD_EVENT);
1327         if (!msg_header) {
1328                 nlmsg_free(skb);
1329                 return -ENOMEM;
1330         }
1331
1332         /* fill the data */
1333         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1334                         sizeof(struct thermal_genl_event));
1335
1336         if (!attr) {
1337                 nlmsg_free(skb);
1338                 return -EINVAL;
1339         }
1340
1341         thermal_event = nla_data(attr);
1342         if (!thermal_event) {
1343                 nlmsg_free(skb);
1344                 return -EINVAL;
1345         }
1346
1347         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1348
1349         thermal_event->orig = orig;
1350         thermal_event->event = event;
1351
1352         /* send multicast genetlink message */
1353         result = genlmsg_end(skb, msg_header);
1354         if (result < 0) {
1355                 nlmsg_free(skb);
1356                 return result;
1357         }
1358
1359         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1360         if (result)
1361                 printk(KERN_INFO "failed to send netlink event:%d", result);
1362
1363         return result;
1364 }
1365 EXPORT_SYMBOL(thermal_generate_netlink_event);
1366
1367 static int genetlink_init(void)
1368 {
1369         int result;
1370
1371         result = genl_register_family(&thermal_event_genl_family);
1372         if (result)
1373                 return result;
1374
1375         result = genl_register_mc_group(&thermal_event_genl_family,
1376                                         &thermal_event_mcgrp);
1377         if (result)
1378                 genl_unregister_family(&thermal_event_genl_family);
1379         return result;
1380 }
1381
1382 static void genetlink_exit(void)
1383 {
1384         genl_unregister_family(&thermal_event_genl_family);
1385 }
1386 #else /* !CONFIG_NET */
1387 static inline int genetlink_init(void) { return 0; }
1388 static inline void genetlink_exit(void) {}
1389 #endif /* !CONFIG_NET */
1390
1391 static int __init thermal_init(void)
1392 {
1393         int result = 0;
1394
1395         result = class_register(&thermal_class);
1396         if (result) {
1397                 idr_destroy(&thermal_tz_idr);
1398                 idr_destroy(&thermal_cdev_idr);
1399                 mutex_destroy(&thermal_idr_lock);
1400                 mutex_destroy(&thermal_list_lock);
1401         }
1402         result = genetlink_init();
1403         return result;
1404 }
1405
1406 static void __exit thermal_exit(void)
1407 {
1408         class_unregister(&thermal_class);
1409         idr_destroy(&thermal_tz_idr);
1410         idr_destroy(&thermal_cdev_idr);
1411         mutex_destroy(&thermal_idr_lock);
1412         mutex_destroy(&thermal_list_lock);
1413         genetlink_exit();
1414 }
1415
1416 fs_initcall(thermal_init);
1417 module_exit(thermal_exit);