drivers/thermal/thermal_sys.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <linux/err.h>
  29 #include <linux/slab.h>
  30 #include <linux/kdev_t.h>
  31 #include <linux/idr.h>
  32 #include <linux/thermal.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/reboot.h>
  35 #include <net/netlink.h>
  36 #include <net/genetlink.h>
  37
  38 MODULE_AUTHOR("Zhang Rui");
  39 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  40 MODULE_LICENSE("GPL");
  41
  42 #define PREFIX "Thermal: "
  43
  44 struct thermal_cooling_device_instance {
  45         int id;
  46         char name[THERMAL_NAME_LENGTH];
  47         struct thermal_zone_device *tz;
  48         struct thermal_cooling_device *cdev;
  49         int trip;
  50         char attr_name[THERMAL_NAME_LENGTH];
  51         struct device_attribute attr;
  52         struct list_head node;
  53 };
  54
  55 static DEFINE_IDR(thermal_tz_idr);
  56 static DEFINE_IDR(thermal_cdev_idr);
  57 static DEFINE_MUTEX(thermal_idr_lock);
  58
  59 static LIST_HEAD(thermal_tz_list);
  60 static LIST_HEAD(thermal_cdev_list);
  61 static DEFINE_MUTEX(thermal_list_lock);
  62
  63 static unsigned int thermal_event_seqnum;
  64
  65 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  66 {
  67         int err;
  68
  69       again:
  70         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  71                 return -ENOMEM;
  72
  73         if (lock)
  74                 mutex_lock(lock);
  75         err = idr_get_new(idr, NULL, id);
  76         if (lock)
  77                 mutex_unlock(lock);
  78         if (unlikely(err == -EAGAIN))
  79                 goto again;
  80         else if (unlikely(err))
  81                 return err;
  82
  83         *id = *id & MAX_ID_MASK;
  84         return 0;
  85 }
  86
  87 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  88 {
  89         if (lock)
  90                 mutex_lock(lock);
  91         idr_remove(idr, id);
  92         if (lock)
  93                 mutex_unlock(lock);
  94 }
  95
  96 /* sys I/F for thermal zone */
  97
  98 #define to_thermal_zone(_dev) \
  99         container_of(_dev, struct thermal_zone_device, device)
 100
 101 static ssize_t
 102 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 103 {
 104         struct thermal_zone_device *tz = to_thermal_zone(dev);
 105
 106         return sprintf(buf, "%s\n", tz->type);
 107 }
 108
 109 static ssize_t
 110 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 111 {
 112         struct thermal_zone_device *tz = to_thermal_zone(dev);
 113         long temperature;
 114         int ret;
 115
 116         if (!tz->ops->get_temp)
 117                 return -EPERM;
 118
 119         ret = tz->ops->get_temp(tz, &temperature);
 120
 121         if (ret)
 122                 return ret;
 123
 124         return sprintf(buf, "%ld\n", temperature);
 125 }
 126
 127 static ssize_t
 128 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 129 {
 130         struct thermal_zone_device *tz = to_thermal_zone(dev);
 131         enum thermal_device_mode mode;
 132         int result;
 133
 134         if (!tz->ops->get_mode)
 135                 return -EPERM;
 136
 137         result = tz->ops->get_mode(tz, &mode);
 138         if (result)
 139                 return result;
 140
 141         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 142                        : "disabled");
 143 }
 144
 145 static ssize_t
 146 mode_store(struct device *dev, struct device_attribute *attr,
 147            const char *buf, size_t count)
 148 {
 149         struct thermal_zone_device *tz = to_thermal_zone(dev);
 150         int result;
 151
 152         if (!tz->ops->set_mode)
 153                 return -EPERM;
 154
 155         if (!strncmp(buf, "enabled", sizeof("enabled")))
 156                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 157         else if (!strncmp(buf, "disabled", sizeof("disabled")))
 158                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 159         else
 160                 result = -EINVAL;
 161
 162         if (result)
 163                 return result;
 164
 165         return count;
 166 }
 167
 168 static ssize_t
 169 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 170                      char *buf)
 171 {
 172         struct thermal_zone_device *tz = to_thermal_zone(dev);
 173         enum thermal_trip_type type;
 174         int trip, result;
 175
 176         if (!tz->ops->get_trip_type)
 177                 return -EPERM;
 178
 179         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 180                 return -EINVAL;
 181
 182         result = tz->ops->get_trip_type(tz, trip, &type);
 183         if (result)
 184                 return result;
 185
 186         switch (type) {
 187         case THERMAL_TRIP_CRITICAL:
 188                 return sprintf(buf, "critical\n");
 189         case THERMAL_TRIP_HOT:
 190                 return sprintf(buf, "hot\n");
 191         case THERMAL_TRIP_PASSIVE:
 192                 return sprintf(buf, "passive\n");
 193         case THERMAL_TRIP_ACTIVE:
 194                 return sprintf(buf, "active\n");
 195         default:
 196                 return sprintf(buf, "unknown\n");
 197         }
 198 }
 199
 200 static ssize_t
 201 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 202                      char *buf)
 203 {
 204         struct thermal_zone_device *tz = to_thermal_zone(dev);
 205         int trip, ret;
 206         long temperature;
 207
 208         if (!tz->ops->get_trip_temp)
 209                 return -EPERM;
 210
 211         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 212                 return -EINVAL;
 213
 214         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 215
 216         if (ret)
 217                 return ret;
 218
 219         return sprintf(buf, "%ld\n", temperature);
 220 }
 221
 222 static ssize_t
 223 passive_store(struct device *dev, struct device_attribute *attr,
 224                     const char *buf, size_t count)
 225 {
 226         struct thermal_zone_device *tz = to_thermal_zone(dev);
 227         struct thermal_cooling_device *cdev = NULL;
 228         int state;
 229
 230         if (!sscanf(buf, "%d\n", &state))
 231                 return -EINVAL;
 232
 233         /* sanity check: values below 1000 millicelcius don't make sense
 234          * and can cause the system to go into a thermal heart attack
 235          */
 236         if (state && state < 1000)
 237                 return -EINVAL;
 238
 239         if (state && !tz->forced_passive) {
 240                 mutex_lock(&thermal_list_lock);
 241                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 242                         if (!strncmp("Processor", cdev->type,
 243                                      sizeof("Processor")))
 244                                 thermal_zone_bind_cooling_device(tz,
 245                                                                  THERMAL_TRIPS_NONE,
 246                                                                  cdev);
 247                 }
 248                 mutex_unlock(&thermal_list_lock);
 249                 if (!tz->passive_delay)
 250                         tz->passive_delay = 1000;
 251         } else if (!state && tz->forced_passive) {
 252                 mutex_lock(&thermal_list_lock);
 253                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 254                         if (!strncmp("Processor", cdev->type,
 255                                      sizeof("Processor")))
 256                                 thermal_zone_unbind_cooling_device(tz,
 257                                                                    THERMAL_TRIPS_NONE,
 258                                                                    cdev);
 259                 }
 260                 mutex_unlock(&thermal_list_lock);
 261                 tz->passive_delay = 0;
 262         }
 263
 264         tz->tc1 = 1;
 265         tz->tc2 = 1;
 266
 267         tz->forced_passive = state;
 268
 269         thermal_zone_device_update(tz);
 270
 271         return count;
 272 }
 273
 274 static ssize_t
 275 passive_show(struct device *dev, struct device_attribute *attr,
 276                    char *buf)
 277 {
 278         struct thermal_zone_device *tz = to_thermal_zone(dev);
 279
 280         return sprintf(buf, "%d\n", tz->forced_passive);
 281 }
 282
 283 static DEVICE_ATTR(type, 0444, type_show, NULL);
 284 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 285 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 286 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
 287                    passive_store);
 288
 289 static struct device_attribute trip_point_attrs[] = {
 290         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 291         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 292         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 293         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 294         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 295         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 296         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 297         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 298         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 299         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 300         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 301         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 302         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 303         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 304         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 305         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 306         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 307         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 308         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 309         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 310         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
 311         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
 312         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
 313         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
 314 };
 315
 316 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 317 do {    \
 318         result = device_create_file(_dev,       \
 319                                 &trip_point_attrs[_index * 2]); \
 320         if (result)     \
 321                 break;  \
 322         result = device_create_file(_dev,       \
 323                         &trip_point_attrs[_index * 2 + 1]);     \
 324 } while (0)
 325
 326 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 327 do {    \
 328         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 329         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 330 } while (0)
 331
 332 /* sys I/F for cooling device */
 333 #define to_cooling_device(_dev) \
 334         container_of(_dev, struct thermal_cooling_device, device)
 335
 336 static ssize_t
 337 thermal_cooling_device_type_show(struct device *dev,
 338                                  struct device_attribute *attr, char *buf)
 339 {
 340         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 341
 342         return sprintf(buf, "%s\n", cdev->type);
 343 }
 344
 345 static ssize_t
 346 thermal_cooling_device_max_state_show(struct device *dev,
 347                                       struct device_attribute *attr, char *buf)
 348 {
 349         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 350         unsigned long state;
 351         int ret;
 352
 353         ret = cdev->ops->get_max_state(cdev, &state);
 354         if (ret)
 355                 return ret;
 356         return sprintf(buf, "%ld\n", state);
 357 }
 358
 359 static ssize_t
 360 thermal_cooling_device_cur_state_show(struct device *dev,
 361                                       struct device_attribute *attr, char *buf)
 362 {
 363         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 364         unsigned long state;
 365         int ret;
 366
 367         ret = cdev->ops->get_cur_state(cdev, &state);
 368         if (ret)
 369                 return ret;
 370         return sprintf(buf, "%ld\n", state);
 371 }
 372
 373 static ssize_t
 374 thermal_cooling_device_cur_state_store(struct device *dev,
 375                                        struct device_attribute *attr,
 376                                        const char *buf, size_t count)
 377 {
 378         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 379         unsigned long state;
 380         int result;
 381
 382         if (!sscanf(buf, "%ld\n", &state))
 383                 return -EINVAL;
 384
 385         if ((long)state < 0)
 386                 return -EINVAL;
 387
 388         result = cdev->ops->set_cur_state(cdev, state);
 389         if (result)
 390                 return result;
 391         return count;
 392 }
 393
 394 static struct device_attribute dev_attr_cdev_type =
 395 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 396 static DEVICE_ATTR(max_state, 0444,
 397                    thermal_cooling_device_max_state_show, NULL);
 398 static DEVICE_ATTR(cur_state, 0644,
 399                    thermal_cooling_device_cur_state_show,
 400                    thermal_cooling_device_cur_state_store);
 401
 402 static ssize_t
 403 thermal_cooling_device_trip_point_show(struct device *dev,
 404                                        struct device_attribute *attr, char *buf)
 405 {
 406         struct thermal_cooling_device_instance *instance;
 407
 408         instance =
 409             container_of(attr, struct thermal_cooling_device_instance, attr);
 410
 411         if (instance->trip == THERMAL_TRIPS_NONE)
 412                 return sprintf(buf, "-1\n");
 413         else
 414                 return sprintf(buf, "%d\n", instance->trip);
 415 }
 416
 417 /* Device management */
 418
 419 #if defined(CONFIG_THERMAL_HWMON)
 420
 421 /* hwmon sys I/F */
 422 #include <linux/hwmon.h>
 423
 424 /* thermal zone devices with the same type share one hwmon device */
 425 struct thermal_hwmon_device {
 426         char type[THERMAL_NAME_LENGTH];
 427         struct device *device;
 428         int count;
 429         struct list_head tz_list;
 430         struct list_head node;
 431 };
 432
 433 struct thermal_hwmon_attr {
 434         struct device_attribute attr;
 435         char name[16];
 436 };
 437
 438 /* one temperature input for each thermal zone */
 439 struct thermal_hwmon_temp {
 440         struct list_head hwmon_node;
 441         struct thermal_zone_device *tz;
 442         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 443         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 444 };
 445
 446 static LIST_HEAD(thermal_hwmon_list);
 447
 448 static ssize_t
 449 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 450 {
 451         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 452         return sprintf(buf, "%s\n", hwmon->type);
 453 }
 454 static DEVICE_ATTR(name, 0444, name_show, NULL);
 455
 456 static ssize_t
 457 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 458 {
 459         long temperature;
 460         int ret;
 461         struct thermal_hwmon_attr *hwmon_attr
 462                         = container_of(attr, struct thermal_hwmon_attr, attr);
 463         struct thermal_hwmon_temp *temp
 464                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 465                                        temp_input);
 466         struct thermal_zone_device *tz = temp->tz;
 467
 468         ret = tz->ops->get_temp(tz, &temperature);
 469
 470         if (ret)
 471                 return ret;
 472
 473         return sprintf(buf, "%ld\n", temperature);
 474 }
 475
 476 static ssize_t
 477 temp_crit_show(struct device *dev, struct device_attribute *attr,
 478                 char *buf)
 479 {
 480         struct thermal_hwmon_attr *hwmon_attr
 481                         = container_of(attr, struct thermal_hwmon_attr, attr);
 482         struct thermal_hwmon_temp *temp
 483                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 484                                        temp_crit);
 485         struct thermal_zone_device *tz = temp->tz;
 486         long temperature;
 487         int ret;
 488
 489         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 490         if (ret)
 491                 return ret;
 492
 493         return sprintf(buf, "%ld\n", temperature);
 494 }
 495
 496
 497 static struct thermal_hwmon_device *
 498 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 499 {
 500         struct thermal_hwmon_device *hwmon;
 501
 502         mutex_lock(&thermal_list_lock);
 503         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 504                 if (!strcmp(hwmon->type, tz->type)) {
 505                         mutex_unlock(&thermal_list_lock);
 506                         return hwmon;
 507                 }
 508         mutex_unlock(&thermal_list_lock);
 509
 510         return NULL;
 511 }
 512
 513 /* Find the temperature input matching a given thermal zone */
 514 static struct thermal_hwmon_temp *
 515 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 516                           const struct thermal_zone_device *tz)
 517 {
 518         struct thermal_hwmon_temp *temp;
 519
 520         mutex_lock(&thermal_list_lock);
 521         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 522                 if (temp->tz == tz) {
 523                         mutex_unlock(&thermal_list_lock);
 524                         return temp;
 525                 }
 526         mutex_unlock(&thermal_list_lock);
 527
 528         return NULL;
 529 }
 530
 531 static int
 532 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 533 {
 534         struct thermal_hwmon_device *hwmon;
 535         struct thermal_hwmon_temp *temp;
 536         int new_hwmon_device = 1;
 537         int result;
 538
 539         hwmon = thermal_hwmon_lookup_by_type(tz);
 540         if (hwmon) {
 541                 new_hwmon_device = 0;
 542                 goto register_sys_interface;
 543         }
 544
 545         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 546         if (!hwmon)
 547                 return -ENOMEM;
 548
 549         INIT_LIST_HEAD(&hwmon->tz_list);
 550         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 551         hwmon->device = hwmon_device_register(NULL);
 552         if (IS_ERR(hwmon->device)) {
 553                 result = PTR_ERR(hwmon->device);
 554                 goto free_mem;
 555         }
 556         dev_set_drvdata(hwmon->device, hwmon);
 557         result = device_create_file(hwmon->device, &dev_attr_name);
 558         if (result)
 559                 goto free_mem;
 560
 561  register_sys_interface:
 562         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 563         if (!temp) {
 564                 result = -ENOMEM;
 565                 goto unregister_name;
 566         }
 567
 568         temp->tz = tz;
 569         hwmon->count++;
 570
 571         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
 572                  "temp%d_input", hwmon->count);
 573         temp->temp_input.attr.attr.name = temp->temp_input.name;
 574         temp->temp_input.attr.attr.mode = 0444;
 575         temp->temp_input.attr.show = temp_input_show;
 576         sysfs_attr_init(&temp->temp_input.attr.attr);
 577         result = device_create_file(hwmon->device, &temp->temp_input.attr);
 578         if (result)
 579                 goto free_temp_mem;
 580
 581         if (tz->ops->get_crit_temp) {
 582                 unsigned long temperature;
 583                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 584                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
 585                                 "temp%d_crit", hwmon->count);
 586                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 587                         temp->temp_crit.attr.attr.mode = 0444;
 588                         temp->temp_crit.attr.show = temp_crit_show;
 589                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 590                         result = device_create_file(hwmon->device,
 591                                                     &temp->temp_crit.attr);
 592                         if (result)
 593                                 goto unregister_input;
 594                 }
 595         }
 596
 597         mutex_lock(&thermal_list_lock);
 598         if (new_hwmon_device)
 599                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 600         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 601         mutex_unlock(&thermal_list_lock);
 602
 603         return 0;
 604
 605  unregister_input:
 606         device_remove_file(hwmon->device, &temp->temp_input.attr);
 607  free_temp_mem:
 608         kfree(temp);
 609  unregister_name:
 610         if (new_hwmon_device) {
 611                 device_remove_file(hwmon->device, &dev_attr_name);
 612                 hwmon_device_unregister(hwmon->device);
 613         }
 614  free_mem:
 615         if (new_hwmon_device)
 616                 kfree(hwmon);
 617
 618         return result;
 619 }
 620
 621 static void
 622 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 623 {
 624         struct thermal_hwmon_device *hwmon;
 625         struct thermal_hwmon_temp *temp;
 626
 627         hwmon = thermal_hwmon_lookup_by_type(tz);
 628         if (unlikely(!hwmon)) {
 629                 /* Should never happen... */
 630                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 631                 return;
 632         }
 633
 634         temp = thermal_hwmon_lookup_temp(hwmon, tz);
 635         if (unlikely(!temp)) {
 636                 /* Should never happen... */
 637                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
 638                 return;
 639         }
 640
 641         device_remove_file(hwmon->device, &temp->temp_input.attr);
 642         if (tz->ops->get_crit_temp)
 643                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
 644
 645         mutex_lock(&thermal_list_lock);
 646         list_del(&temp->hwmon_node);
 647         kfree(temp);
 648         if (!list_empty(&hwmon->tz_list)) {
 649                 mutex_unlock(&thermal_list_lock);
 650                 return;
 651         }
 652         list_del(&hwmon->node);
 653         mutex_unlock(&thermal_list_lock);
 654
 655         device_remove_file(hwmon->device, &dev_attr_name);
 656         hwmon_device_unregister(hwmon->device);
 657         kfree(hwmon);
 658 }
 659 #else
 660 static int
 661 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 662 {
 663         return 0;
 664 }
 665
 666 static void
 667 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 668 {
 669 }
 670 #endif
 671
 672 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 673                                             int delay)
 674 {
 675         cancel_delayed_work(&(tz->poll_queue));
 676
 677         if (!delay)
 678                 return;
 679
 680         if (delay > 1000)
 681                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 682                                       round_jiffies(msecs_to_jiffies(delay)));
 683         else
 684                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 685                                       msecs_to_jiffies(delay));
 686 }
 687
 688 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 689                                         int temp, int trip_temp, int trip)
 690 {
 691         int trend = 0;
 692         struct thermal_cooling_device_instance *instance;
 693         struct thermal_cooling_device *cdev;
 694         long state, max_state;
 695
 696         /*
 697          * Above Trip?
 698          * -----------
 699          * Calculate the thermal trend (using the passive cooling equation)
 700          * and modify the performance limit for all passive cooling devices
 701          * accordingly.  Note that we assume symmetry.
 702          */
 703         if (temp >= trip_temp) {
 704                 tz->passive = true;
 705
 706                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 707                         (tz->tc2 * (temp - trip_temp));
 708
 709                 /* Heating up? */
 710                 if (trend > 0) {
 711                         list_for_each_entry(instance, &tz->cooling_devices,
 712                                             node) {
 713                                 if (instance->trip != trip)
 714                                         continue;
 715                                 cdev = instance->cdev;
 716                                 cdev->ops->get_cur_state(cdev, &state);
 717                                 cdev->ops->get_max_state(cdev, &max_state);
 718                                 if (state++ < max_state)
 719                                         cdev->ops->set_cur_state(cdev, state);
 720                         }
 721                 } else if (trend < 0) { /* Cooling off? */
 722                         list_for_each_entry(instance, &tz->cooling_devices,
 723                                             node) {
 724                                 if (instance->trip != trip)
 725                                         continue;
 726                                 cdev = instance->cdev;
 727                                 cdev->ops->get_cur_state(cdev, &state);
 728                                 cdev->ops->get_max_state(cdev, &max_state);
 729                                 if (state > 0)
 730                                         cdev->ops->set_cur_state(cdev, --state);
 731                         }
 732                 }
 733                 return;
 734         }
 735
 736         /*
 737          * Below Trip?
 738          * -----------
 739          * Implement passive cooling hysteresis to slowly increase performance
 740          * and avoid thrashing around the passive trip point.  Note that we
 741          * assume symmetry.
 742          */
 743         list_for_each_entry(instance, &tz->cooling_devices, node) {
 744                 if (instance->trip != trip)
 745                         continue;
 746                 cdev = instance->cdev;
 747                 cdev->ops->get_cur_state(cdev, &state);
 748                 cdev->ops->get_max_state(cdev, &max_state);
 749                 if (state > 0)
 750                         cdev->ops->set_cur_state(cdev, --state);
 751                 if (state == 0)
 752                         tz->passive = false;
 753         }
 754 }
 755
 756 static void thermal_zone_device_check(struct work_struct *work)
 757 {
 758         struct thermal_zone_device *tz = container_of(work, struct
 759                                                       thermal_zone_device,
 760                                                       poll_queue.work);
 761         thermal_zone_device_update(tz);
 762 }
 763
 764 /**
 765  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 766  * @tz:         thermal zone device
 767  * @trip:       indicates which trip point the cooling devices is
 768  *              associated with in this thermal zone.
 769  * @cdev:       thermal cooling device
 770  *
 771  * This function is usually called in the thermal zone device .bind callback.
 772  */
 773 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 774                                      int trip,
 775                                      struct thermal_cooling_device *cdev)
 776 {
 777         struct thermal_cooling_device_instance *dev;
 778         struct thermal_cooling_device_instance *pos;
 779         struct thermal_zone_device *pos1;
 780         struct thermal_cooling_device *pos2;
 781         int result;
 782
 783         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 784                 return -EINVAL;
 785
 786         list_for_each_entry(pos1, &thermal_tz_list, node) {
 787                 if (pos1 == tz)
 788                         break;
 789         }
 790         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 791                 if (pos2 == cdev)
 792                         break;
 793         }
 794
 795         if (tz != pos1 || cdev != pos2)
 796                 return -EINVAL;
 797
 798         dev =
 799             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 800         if (!dev)
 801                 return -ENOMEM;
 802         dev->tz = tz;
 803         dev->cdev = cdev;
 804         dev->trip = trip;
 805         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 806         if (result)
 807                 goto free_mem;
 808
 809         sprintf(dev->name, "cdev%d", dev->id);
 810         result =
 811             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 812         if (result)
 813                 goto release_idr;
 814
 815         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 816         sysfs_attr_init(&dev->attr.attr);
 817         dev->attr.attr.name = dev->attr_name;
 818         dev->attr.attr.mode = 0444;
 819         dev->attr.show = thermal_cooling_device_trip_point_show;
 820         result = device_create_file(&tz->device, &dev->attr);
 821         if (result)
 822                 goto remove_symbol_link;
 823
 824         mutex_lock(&tz->lock);
 825         list_for_each_entry(pos, &tz->cooling_devices, node)
 826             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 827                 result = -EEXIST;
 828                 break;
 829         }
 830         if (!result)
 831                 list_add_tail(&dev->node, &tz->cooling_devices);
 832         mutex_unlock(&tz->lock);
 833
 834         if (!result)
 835                 return 0;
 836
 837         device_remove_file(&tz->device, &dev->attr);
 838       remove_symbol_link:
 839         sysfs_remove_link(&tz->device.kobj, dev->name);
 840       release_idr:
 841         release_idr(&tz->idr, &tz->lock, dev->id);
 842       free_mem:
 843         kfree(dev);
 844         return result;
 845 }
 846
 847 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 848
 849 /**
 850  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 851  * @tz:         thermal zone device
 852  * @trip:       indicates which trip point the cooling devices is
 853  *              associated with in this thermal zone.
 854  * @cdev:       thermal cooling device
 855  *
 856  * This function is usually called in the thermal zone device .unbind callback.
 857  */
 858 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 859                                        int trip,
 860                                        struct thermal_cooling_device *cdev)
 861 {
 862         struct thermal_cooling_device_instance *pos, *next;
 863
 864         mutex_lock(&tz->lock);
 865         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 866                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 867                         list_del(&pos->node);
 868                         mutex_unlock(&tz->lock);
 869                         goto unbind;
 870                 }
 871         }
 872         mutex_unlock(&tz->lock);
 873
 874         return -ENODEV;
 875
 876       unbind:
 877         device_remove_file(&tz->device, &pos->attr);
 878         sysfs_remove_link(&tz->device.kobj, pos->name);
 879         release_idr(&tz->idr, &tz->lock, pos->id);
 880         kfree(pos);
 881         return 0;
 882 }
 883
 884 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 885
 886 static void thermal_release(struct device *dev)
 887 {
 888         struct thermal_zone_device *tz;
 889         struct thermal_cooling_device *cdev;
 890
 891         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
 892                 tz = to_thermal_zone(dev);
 893                 kfree(tz);
 894         } else {
 895                 cdev = to_cooling_device(dev);
 896                 kfree(cdev);
 897         }
 898 }
 899
 900 static struct class thermal_class = {
 901         .name = "thermal",
 902         .dev_release = thermal_release,
 903 };
 904
 905 /**
 906  * thermal_cooling_device_register - register a new thermal cooling device
 907  * @type:       the thermal cooling device type.
 908  * @devdata:    device private data.
 909  * @ops:                standard thermal cooling devices callbacks.
 910  */
 911 struct thermal_cooling_device *thermal_cooling_device_register(
 912      char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 913 {
 914         struct thermal_cooling_device *cdev;
 915         struct thermal_zone_device *pos;
 916         int result;
 917
 918         if (strlen(type) >= THERMAL_NAME_LENGTH)
 919                 return ERR_PTR(-EINVAL);
 920
 921         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 922             !ops->set_cur_state)
 923                 return ERR_PTR(-EINVAL);
 924
 925         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 926         if (!cdev)
 927                 return ERR_PTR(-ENOMEM);
 928
 929         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 930         if (result) {
 931                 kfree(cdev);
 932                 return ERR_PTR(result);
 933         }
 934
 935         strcpy(cdev->type, type);
 936         cdev->ops = ops;
 937         cdev->device.class = &thermal_class;
 938         cdev->devdata = devdata;
 939         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 940         result = device_register(&cdev->device);
 941         if (result) {
 942                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 943                 kfree(cdev);
 944                 return ERR_PTR(result);
 945         }
 946
 947         /* sys I/F */
 948         if (type) {
 949                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 950                 if (result)
 951                         goto unregister;
 952         }
 953
 954         result = device_create_file(&cdev->device, &dev_attr_max_state);
 955         if (result)
 956                 goto unregister;
 957
 958         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 959         if (result)
 960                 goto unregister;
 961
 962         mutex_lock(&thermal_list_lock);
 963         list_add(&cdev->node, &thermal_cdev_list);
 964         list_for_each_entry(pos, &thermal_tz_list, node) {
 965                 if (!pos->ops->bind)
 966                         continue;
 967                 result = pos->ops->bind(pos, cdev);
 968                 if (result)
 969                         break;
 970
 971         }
 972         mutex_unlock(&thermal_list_lock);
 973
 974         if (!result)
 975                 return cdev;
 976
 977       unregister:
 978         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 979         device_unregister(&cdev->device);
 980         return ERR_PTR(result);
 981 }
 982
 983 EXPORT_SYMBOL(thermal_cooling_device_register);
 984
 985 /**
 986  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 987  * @cdev:       the thermal cooling device to remove.
 988  *
 989  * thermal_cooling_device_unregister() must be called when the device is no
 990  * longer needed.
 991  */
 992 void thermal_cooling_device_unregister(struct
 993                                        thermal_cooling_device
 994                                        *cdev)
 995 {
 996         struct thermal_zone_device *tz;
 997         struct thermal_cooling_device *pos = NULL;
 998
 999         if (!cdev)
1000                 return;
1001
1002         mutex_lock(&thermal_list_lock);
1003         list_for_each_entry(pos, &thermal_cdev_list, node)
1004             if (pos == cdev)
1005                 break;
1006         if (pos != cdev) {
1007                 /* thermal cooling device not found */
1008                 mutex_unlock(&thermal_list_lock);
1009                 return;
1010         }
1011         list_del(&cdev->node);
1012         list_for_each_entry(tz, &thermal_tz_list, node) {
1013                 if (!tz->ops->unbind)
1014                         continue;
1015                 tz->ops->unbind(tz, cdev);
1016         }
1017         mutex_unlock(&thermal_list_lock);
1018         if (cdev->type[0])
1019                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1020         device_remove_file(&cdev->device, &dev_attr_max_state);
1021         device_remove_file(&cdev->device, &dev_attr_cur_state);
1022
1023         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1024         device_unregister(&cdev->device);
1025         return;
1026 }
1027
1028 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1029
1030 /**
1031  * thermal_zone_device_update - force an update of a thermal zone's state
1032  * @ttz:        the thermal zone to update
1033  */
1034
1035 void thermal_zone_device_update(struct thermal_zone_device *tz)
1036 {
1037         int count, ret = 0;
1038         long temp, trip_temp;
1039         enum thermal_trip_type trip_type;
1040         struct thermal_cooling_device_instance *instance;
1041         struct thermal_cooling_device *cdev;
1042
1043         mutex_lock(&tz->lock);
1044
1045         if (tz->ops->get_temp(tz, &temp)) {
1046                 /* get_temp failed - retry it later */
1047                 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
1048                        "%d\n", tz->id);
1049                 goto leave;
1050         }
1051
1052         for (count = 0; count < tz->trips; count++) {
1053                 tz->ops->get_trip_type(tz, count, &trip_type);
1054                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1055
1056                 switch (trip_type) {
1057                 case THERMAL_TRIP_CRITICAL:
1058                         if (temp >= trip_temp) {
1059                                 if (tz->ops->notify)
1060                                         ret = tz->ops->notify(tz, count,
1061                                                               trip_type);
1062                                 if (!ret) {
1063                                         printk(KERN_EMERG
1064                                                "Critical temperature reached (%ld C), shutting down.\n",
1065                                                temp/1000);
1066                                         orderly_poweroff(true);
1067                                 }
1068                         }
1069                         break;
1070                 case THERMAL_TRIP_HOT:
1071                         if (temp >= trip_temp)
1072                                 if (tz->ops->notify)
1073                                         tz->ops->notify(tz, count, trip_type);
1074                         break;
1075                 case THERMAL_TRIP_ACTIVE:
1076                         list_for_each_entry(instance, &tz->cooling_devices,
1077                                             node) {
1078                                 if (instance->trip != count)
1079                                         continue;
1080
1081                                 cdev = instance->cdev;
1082
1083                                 if (temp >= trip_temp)
1084                                         cdev->ops->set_cur_state(cdev, 1);
1085                                 else
1086                                         cdev->ops->set_cur_state(cdev, 0);
1087                         }
1088                         break;
1089                 case THERMAL_TRIP_PASSIVE:
1090                         if (temp >= trip_temp || tz->passive)
1091                                 thermal_zone_device_passive(tz, temp,
1092                                                             trip_temp, count);
1093                         break;
1094                 }
1095         }
1096
1097         if (tz->forced_passive)
1098                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1099                                             THERMAL_TRIPS_NONE);
1100
1101         tz->last_temperature = temp;
1102
1103       leave:
1104         if (tz->passive)
1105                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1106         else if (tz->polling_delay)
1107                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1108         else
1109                 thermal_zone_device_set_polling(tz, 0);
1110         mutex_unlock(&tz->lock);
1111 }
1112 EXPORT_SYMBOL(thermal_zone_device_update);
1113
1114 /**
1115  * thermal_zone_device_register - register a new thermal zone device
1116  * @type:       the thermal zone device type
1117  * @trips:      the number of trip points the thermal zone support
1118  * @devdata:    private device data
1119  * @ops:        standard thermal zone device callbacks
1120  * @tc1:        thermal coefficient 1 for passive calculations
1121  * @tc2:        thermal coefficient 2 for passive calculations
1122  * @passive_delay: number of milliseconds to wait between polls when
1123  *                 performing passive cooling
1124  * @polling_delay: number of milliseconds to wait between polls when checking
1125  *                 whether trip points have been crossed (0 for interrupt
1126  *                 driven systems)
1127  *
1128  * thermal_zone_device_unregister() must be called when the device is no
1129  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1130  * section 11.1.5.1 of the ACPI specification 3.0.
1131  */
1132 struct thermal_zone_device *thermal_zone_device_register(char *type,
1133         int trips, void *devdata,
1134         const struct thermal_zone_device_ops *ops,
1135         int tc1, int tc2, int passive_delay, int polling_delay)
1136 {
1137         struct thermal_zone_device *tz;
1138         struct thermal_cooling_device *pos;
1139         enum thermal_trip_type trip_type;
1140         int result;
1141         int count;
1142         int passive = 0;
1143
1144         if (strlen(type) >= THERMAL_NAME_LENGTH)
1145                 return ERR_PTR(-EINVAL);
1146
1147         if (trips > THERMAL_MAX_TRIPS || trips < 0)
1148                 return ERR_PTR(-EINVAL);
1149
1150         if (!ops || !ops->get_temp)
1151                 return ERR_PTR(-EINVAL);
1152
1153         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1154         if (!tz)
1155                 return ERR_PTR(-ENOMEM);
1156
1157         INIT_LIST_HEAD(&tz->cooling_devices);
1158         idr_init(&tz->idr);
1159         mutex_init(&tz->lock);
1160         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1161         if (result) {
1162                 kfree(tz);
1163                 return ERR_PTR(result);
1164         }
1165
1166         strcpy(tz->type, type);
1167         tz->ops = ops;
1168         tz->device.class = &thermal_class;
1169         tz->devdata = devdata;
1170         tz->trips = trips;
1171         tz->tc1 = tc1;
1172         tz->tc2 = tc2;
1173         tz->passive_delay = passive_delay;
1174         tz->polling_delay = polling_delay;
1175
1176         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1177         result = device_register(&tz->device);
1178         if (result) {
1179                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1180                 kfree(tz);
1181                 return ERR_PTR(result);
1182         }
1183
1184         /* sys I/F */
1185         if (type) {
1186                 result = device_create_file(&tz->device, &dev_attr_type);
1187                 if (result)
1188                         goto unregister;
1189         }
1190
1191         result = device_create_file(&tz->device, &dev_attr_temp);
1192         if (result)
1193                 goto unregister;
1194
1195         if (ops->get_mode) {
1196                 result = device_create_file(&tz->device, &dev_attr_mode);
1197                 if (result)
1198                         goto unregister;
1199         }
1200
1201         for (count = 0; count < trips; count++) {
1202                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1203                 if (result)
1204                         goto unregister;
1205                 tz->ops->get_trip_type(tz, count, &trip_type);
1206                 if (trip_type == THERMAL_TRIP_PASSIVE)
1207                         passive = 1;
1208         }
1209
1210         if (!passive)
1211                 result = device_create_file(&tz->device,
1212                                             &dev_attr_passive);
1213
1214         if (result)
1215                 goto unregister;
1216
1217         result = thermal_add_hwmon_sysfs(tz);
1218         if (result)
1219                 goto unregister;
1220
1221         mutex_lock(&thermal_list_lock);
1222         list_add_tail(&tz->node, &thermal_tz_list);
1223         if (ops->bind)
1224                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1225                 result = ops->bind(tz, pos);
1226                 if (result)
1227                         break;
1228                 }
1229         mutex_unlock(&thermal_list_lock);
1230
1231         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1232
1233         thermal_zone_device_update(tz);
1234
1235         if (!result)
1236                 return tz;
1237
1238       unregister:
1239         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1240         device_unregister(&tz->device);
1241         return ERR_PTR(result);
1242 }
1243
1244 EXPORT_SYMBOL(thermal_zone_device_register);
1245
1246 /**
1247  * thermal_device_unregister - removes the registered thermal zone device
1248  * @tz: the thermal zone device to remove
1249  */
1250 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1251 {
1252         struct thermal_cooling_device *cdev;
1253         struct thermal_zone_device *pos = NULL;
1254         int count;
1255
1256         if (!tz)
1257                 return;
1258
1259         mutex_lock(&thermal_list_lock);
1260         list_for_each_entry(pos, &thermal_tz_list, node)
1261             if (pos == tz)
1262                 break;
1263         if (pos != tz) {
1264                 /* thermal zone device not found */
1265                 mutex_unlock(&thermal_list_lock);
1266                 return;
1267         }
1268         list_del(&tz->node);
1269         if (tz->ops->unbind)
1270                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1271                     tz->ops->unbind(tz, cdev);
1272         mutex_unlock(&thermal_list_lock);
1273
1274         thermal_zone_device_set_polling(tz, 0);
1275
1276         if (tz->type[0])
1277                 device_remove_file(&tz->device, &dev_attr_type);
1278         device_remove_file(&tz->device, &dev_attr_temp);
1279         if (tz->ops->get_mode)
1280                 device_remove_file(&tz->device, &dev_attr_mode);
1281
1282         for (count = 0; count < tz->trips; count++)
1283                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1284
1285         thermal_remove_hwmon_sysfs(tz);
1286         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1287         idr_destroy(&tz->idr);
1288         mutex_destroy(&tz->lock);
1289         device_unregister(&tz->device);
1290         return;
1291 }
1292
1293 EXPORT_SYMBOL(thermal_zone_device_unregister);
1294
1295 #ifdef CONFIG_NET
1296 static struct genl_family thermal_event_genl_family = {
1297         .id = GENL_ID_GENERATE,
1298         .name = THERMAL_GENL_FAMILY_NAME,
1299         .version = THERMAL_GENL_VERSION,
1300         .maxattr = THERMAL_GENL_ATTR_MAX,
1301 };
1302
1303 static struct genl_multicast_group thermal_event_mcgrp = {
1304         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1305 };
1306
1307 int generate_netlink_event(u32 orig, enum events event)
1308 {
1309         struct sk_buff *skb;
1310         struct nlattr *attr;
1311         struct thermal_genl_event *thermal_event;
1312         void *msg_header;
1313         int size;
1314         int result;
1315
1316         /* allocate memory */
1317         size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1318                                 nla_total_size(0);
1319
1320         skb = genlmsg_new(size, GFP_ATOMIC);
1321         if (!skb)
1322                 return -ENOMEM;
1323
1324         /* add the genetlink message header */
1325         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1326                                  &thermal_event_genl_family, 0,
1327                                  THERMAL_GENL_CMD_EVENT);
1328         if (!msg_header) {
1329                 nlmsg_free(skb);
1330                 return -ENOMEM;
1331         }
1332
1333         /* fill the data */
1334         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1335                         sizeof(struct thermal_genl_event));
1336
1337         if (!attr) {
1338                 nlmsg_free(skb);
1339                 return -EINVAL;
1340         }
1341
1342         thermal_event = nla_data(attr);
1343         if (!thermal_event) {
1344                 nlmsg_free(skb);
1345                 return -EINVAL;
1346         }
1347
1348         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1349
1350         thermal_event->orig = orig;
1351         thermal_event->event = event;
1352
1353         /* send multicast genetlink message */
1354         result = genlmsg_end(skb, msg_header);
1355         if (result < 0) {
1356                 nlmsg_free(skb);
1357                 return result;
1358         }
1359
1360         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1361         if (result)
1362                 printk(KERN_INFO "failed to send netlink event:%d", result);
1363
1364         return result;
1365 }
1366 EXPORT_SYMBOL(generate_netlink_event);
1367
1368 static int genetlink_init(void)
1369 {
1370         int result;
1371
1372         result = genl_register_family(&thermal_event_genl_family);
1373         if (result)
1374                 return result;
1375
1376         result = genl_register_mc_group(&thermal_event_genl_family,
1377                                         &thermal_event_mcgrp);
1378         if (result)
1379                 genl_unregister_family(&thermal_event_genl_family);
1380         return result;
1381 }
1382
1383 static void genetlink_exit(void)
1384 {
1385         genl_unregister_family(&thermal_event_genl_family);
1386 }
1387 #else /* !CONFIG_NET */
1388 static inline int genetlink_init(void) { return 0; }
1389 static inline void genetlink_exit(void) {}
1390 #endif /* !CONFIG_NET */
1391
1392 static int __init thermal_init(void)
1393 {
1394         int result = 0;
1395
1396         result = class_register(&thermal_class);
1397         if (result) {
1398                 idr_destroy(&thermal_tz_idr);
1399                 idr_destroy(&thermal_cdev_idr);
1400                 mutex_destroy(&thermal_idr_lock);
1401                 mutex_destroy(&thermal_list_lock);
1402                 return result;
1403         }
1404         result = genetlink_init();
1405         return result;
1406 }
1407
1408 static void __exit thermal_exit(void)
1409 {
1410         class_unregister(&thermal_class);
1411         idr_destroy(&thermal_tz_idr);
1412         idr_destroy(&thermal_cdev_idr);
1413         mutex_destroy(&thermal_idr_lock);
1414         mutex_destroy(&thermal_list_lock);
1415         genetlink_exit();
1416 }
1417
1418 fs_initcall(thermal_init);
1419 module_exit(thermal_exit);