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