Pileus Git - ~andy/linux/blob - drivers/thermal/thermal_sys.c

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