drivers/thermal/thermal_sys.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/reboot.h>
  37 #include <net/netlink.h>
  38 #include <net/genetlink.h>
  39
  40 MODULE_AUTHOR("Zhang Rui");
  41 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  42 MODULE_LICENSE("GPL");
  43
  44 struct thermal_cooling_device_instance {
  45         int id;
  46         char name[THERMAL_NAME_LENGTH];
  47         struct thermal_zone_device *tz;
  48         struct thermal_cooling_device *cdev;
  49         int trip;
  50         char attr_name[THERMAL_NAME_LENGTH];
  51         struct device_attribute attr;
  52         struct list_head node;
  53 };
  54
  55 static DEFINE_IDR(thermal_tz_idr);
  56 static DEFINE_IDR(thermal_cdev_idr);
  57 static DEFINE_MUTEX(thermal_idr_lock);
  58
  59 static LIST_HEAD(thermal_tz_list);
  60 static LIST_HEAD(thermal_cdev_list);
  61 static DEFINE_MUTEX(thermal_list_lock);
  62
  63 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  64 {
  65         int err;
  66
  67 again:
  68         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  69                 return -ENOMEM;
  70
  71         if (lock)
  72                 mutex_lock(lock);
  73         err = idr_get_new(idr, NULL, id);
  74         if (lock)
  75                 mutex_unlock(lock);
  76         if (unlikely(err == -EAGAIN))
  77                 goto again;
  78         else if (unlikely(err))
  79                 return err;
  80
  81         *id = *id & MAX_ID_MASK;
  82         return 0;
  83 }
  84
  85 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  86 {
  87         if (lock)
  88                 mutex_lock(lock);
  89         idr_remove(idr, id);
  90         if (lock)
  91                 mutex_unlock(lock);
  92 }
  93
  94 /* sys I/F for thermal zone */
  95
  96 #define to_thermal_zone(_dev) \
  97         container_of(_dev, struct thermal_zone_device, device)
  98
  99 static ssize_t
 100 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 101 {
 102         struct thermal_zone_device *tz = to_thermal_zone(dev);
 103
 104         return sprintf(buf, "%s\n", tz->type);
 105 }
 106
 107 static ssize_t
 108 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 109 {
 110         struct thermal_zone_device *tz = to_thermal_zone(dev);
 111         long temperature;
 112         int ret;
 113
 114         if (!tz->ops->get_temp)
 115                 return -EPERM;
 116
 117         ret = tz->ops->get_temp(tz, &temperature);
 118
 119         if (ret)
 120                 return ret;
 121
 122         return sprintf(buf, "%ld\n", temperature);
 123 }
 124
 125 static ssize_t
 126 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 127 {
 128         struct thermal_zone_device *tz = to_thermal_zone(dev);
 129         enum thermal_device_mode mode;
 130         int result;
 131
 132         if (!tz->ops->get_mode)
 133                 return -EPERM;
 134
 135         result = tz->ops->get_mode(tz, &mode);
 136         if (result)
 137                 return result;
 138
 139         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 140                        : "disabled");
 141 }
 142
 143 static ssize_t
 144 mode_store(struct device *dev, struct device_attribute *attr,
 145            const char *buf, size_t count)
 146 {
 147         struct thermal_zone_device *tz = to_thermal_zone(dev);
 148         int result;
 149
 150         if (!tz->ops->set_mode)
 151                 return -EPERM;
 152
 153         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 154                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 155         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 156                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 157         else
 158                 result = -EINVAL;
 159
 160         if (result)
 161                 return result;
 162
 163         return count;
 164 }
 165
 166 static ssize_t
 167 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 168                      char *buf)
 169 {
 170         struct thermal_zone_device *tz = to_thermal_zone(dev);
 171         enum thermal_trip_type type;
 172         int trip, result;
 173
 174         if (!tz->ops->get_trip_type)
 175                 return -EPERM;
 176
 177         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 178                 return -EINVAL;
 179
 180         result = tz->ops->get_trip_type(tz, trip, &type);
 181         if (result)
 182                 return result;
 183
 184         switch (type) {
 185         case THERMAL_TRIP_CRITICAL:
 186                 return sprintf(buf, "critical\n");
 187         case THERMAL_TRIP_HOT:
 188                 return sprintf(buf, "hot\n");
 189         case THERMAL_TRIP_PASSIVE:
 190                 return sprintf(buf, "passive\n");
 191         case THERMAL_TRIP_ACTIVE:
 192                 return sprintf(buf, "active\n");
 193         default:
 194                 return sprintf(buf, "unknown\n");
 195         }
 196 }
 197
 198 static ssize_t
 199 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 200                      const char *buf, size_t count)
 201 {
 202         struct thermal_zone_device *tz = to_thermal_zone(dev);
 203         int trip, ret;
 204         unsigned long temperature;
 205
 206         if (!tz->ops->set_trip_temp)
 207                 return -EPERM;
 208
 209         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 210                 return -EINVAL;
 211
 212         if (kstrtoul(buf, 10, &temperature))
 213                 return -EINVAL;
 214
 215         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 216
 217         return ret ? ret : count;
 218 }
 219
 220 static ssize_t
 221 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 222                      char *buf)
 223 {
 224         struct thermal_zone_device *tz = to_thermal_zone(dev);
 225         int trip, ret;
 226         long temperature;
 227
 228         if (!tz->ops->get_trip_temp)
 229                 return -EPERM;
 230
 231         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 232                 return -EINVAL;
 233
 234         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 235
 236         if (ret)
 237                 return ret;
 238
 239         return sprintf(buf, "%ld\n", temperature);
 240 }
 241
 242 static ssize_t
 243 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 244                         const char *buf, size_t count)
 245 {
 246         struct thermal_zone_device *tz = to_thermal_zone(dev);
 247         int trip, ret;
 248         unsigned long temperature;
 249
 250         if (!tz->ops->set_trip_hyst)
 251                 return -EPERM;
 252
 253         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 254                 return -EINVAL;
 255
 256         if (kstrtoul(buf, 10, &temperature))
 257                 return -EINVAL;
 258
 259         /*
 260          * We are not doing any check on the 'temperature' value
 261          * here. The driver implementing 'set_trip_hyst' has to
 262          * take care of this.
 263          */
 264         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 265
 266         return ret ? ret : count;
 267 }
 268
 269 static ssize_t
 270 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 271                         char *buf)
 272 {
 273         struct thermal_zone_device *tz = to_thermal_zone(dev);
 274         int trip, ret;
 275         unsigned long temperature;
 276
 277         if (!tz->ops->get_trip_hyst)
 278                 return -EPERM;
 279
 280         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 281                 return -EINVAL;
 282
 283         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 284
 285         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 286 }
 287
 288 static ssize_t
 289 passive_store(struct device *dev, struct device_attribute *attr,
 290                     const char *buf, size_t count)
 291 {
 292         struct thermal_zone_device *tz = to_thermal_zone(dev);
 293         struct thermal_cooling_device *cdev = NULL;
 294         int state;
 295
 296         if (!sscanf(buf, "%d\n", &state))
 297                 return -EINVAL;
 298
 299         /* sanity check: values below 1000 millicelcius don't make sense
 300          * and can cause the system to go into a thermal heart attack
 301          */
 302         if (state && state < 1000)
 303                 return -EINVAL;
 304
 305         if (state && !tz->forced_passive) {
 306                 mutex_lock(&thermal_list_lock);
 307                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 308                         if (!strncmp("Processor", cdev->type,
 309                                      sizeof("Processor")))
 310                                 thermal_zone_bind_cooling_device(tz,
 311                                                                  THERMAL_TRIPS_NONE,
 312                                                                  cdev);
 313                 }
 314                 mutex_unlock(&thermal_list_lock);
 315                 if (!tz->passive_delay)
 316                         tz->passive_delay = 1000;
 317         } else if (!state && tz->forced_passive) {
 318                 mutex_lock(&thermal_list_lock);
 319                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 320                         if (!strncmp("Processor", cdev->type,
 321                                      sizeof("Processor")))
 322                                 thermal_zone_unbind_cooling_device(tz,
 323                                                                    THERMAL_TRIPS_NONE,
 324                                                                    cdev);
 325                 }
 326                 mutex_unlock(&thermal_list_lock);
 327                 tz->passive_delay = 0;
 328         }
 329
 330         tz->tc1 = 1;
 331         tz->tc2 = 1;
 332
 333         tz->forced_passive = state;
 334
 335         thermal_zone_device_update(tz);
 336
 337         return count;
 338 }
 339
 340 static ssize_t
 341 passive_show(struct device *dev, struct device_attribute *attr,
 342                    char *buf)
 343 {
 344         struct thermal_zone_device *tz = to_thermal_zone(dev);
 345
 346         return sprintf(buf, "%d\n", tz->forced_passive);
 347 }
 348
 349 static DEVICE_ATTR(type, 0444, type_show, NULL);
 350 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 351 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 352 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 353
 354 /* sys I/F for cooling device */
 355 #define to_cooling_device(_dev) \
 356         container_of(_dev, struct thermal_cooling_device, device)
 357
 358 static ssize_t
 359 thermal_cooling_device_type_show(struct device *dev,
 360                                  struct device_attribute *attr, char *buf)
 361 {
 362         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 363
 364         return sprintf(buf, "%s\n", cdev->type);
 365 }
 366
 367 static ssize_t
 368 thermal_cooling_device_max_state_show(struct device *dev,
 369                                       struct device_attribute *attr, char *buf)
 370 {
 371         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 372         unsigned long state;
 373         int ret;
 374
 375         ret = cdev->ops->get_max_state(cdev, &state);
 376         if (ret)
 377                 return ret;
 378         return sprintf(buf, "%ld\n", state);
 379 }
 380
 381 static ssize_t
 382 thermal_cooling_device_cur_state_show(struct device *dev,
 383                                       struct device_attribute *attr, char *buf)
 384 {
 385         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 386         unsigned long state;
 387         int ret;
 388
 389         ret = cdev->ops->get_cur_state(cdev, &state);
 390         if (ret)
 391                 return ret;
 392         return sprintf(buf, "%ld\n", state);
 393 }
 394
 395 static ssize_t
 396 thermal_cooling_device_cur_state_store(struct device *dev,
 397                                        struct device_attribute *attr,
 398                                        const char *buf, size_t count)
 399 {
 400         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 401         unsigned long state;
 402         int result;
 403
 404         if (!sscanf(buf, "%ld\n", &state))
 405                 return -EINVAL;
 406
 407         if ((long)state < 0)
 408                 return -EINVAL;
 409
 410         result = cdev->ops->set_cur_state(cdev, state);
 411         if (result)
 412                 return result;
 413         return count;
 414 }
 415
 416 static struct device_attribute dev_attr_cdev_type =
 417 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 418 static DEVICE_ATTR(max_state, 0444,
 419                    thermal_cooling_device_max_state_show, NULL);
 420 static DEVICE_ATTR(cur_state, 0644,
 421                    thermal_cooling_device_cur_state_show,
 422                    thermal_cooling_device_cur_state_store);
 423
 424 static ssize_t
 425 thermal_cooling_device_trip_point_show(struct device *dev,
 426                                        struct device_attribute *attr, char *buf)
 427 {
 428         struct thermal_cooling_device_instance *instance;
 429
 430         instance =
 431             container_of(attr, struct thermal_cooling_device_instance, attr);
 432
 433         if (instance->trip == THERMAL_TRIPS_NONE)
 434                 return sprintf(buf, "-1\n");
 435         else
 436                 return sprintf(buf, "%d\n", instance->trip);
 437 }
 438
 439 /* Device management */
 440
 441 #if defined(CONFIG_THERMAL_HWMON)
 442
 443 /* hwmon sys I/F */
 444 #include <linux/hwmon.h>
 445
 446 /* thermal zone devices with the same type share one hwmon device */
 447 struct thermal_hwmon_device {
 448         char type[THERMAL_NAME_LENGTH];
 449         struct device *device;
 450         int count;
 451         struct list_head tz_list;
 452         struct list_head node;
 453 };
 454
 455 struct thermal_hwmon_attr {
 456         struct device_attribute attr;
 457         char name[16];
 458 };
 459
 460 /* one temperature input for each thermal zone */
 461 struct thermal_hwmon_temp {
 462         struct list_head hwmon_node;
 463         struct thermal_zone_device *tz;
 464         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 465         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 466 };
 467
 468 static LIST_HEAD(thermal_hwmon_list);
 469
 470 static ssize_t
 471 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 472 {
 473         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 474         return sprintf(buf, "%s\n", hwmon->type);
 475 }
 476 static DEVICE_ATTR(name, 0444, name_show, NULL);
 477
 478 static ssize_t
 479 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 480 {
 481         long temperature;
 482         int ret;
 483         struct thermal_hwmon_attr *hwmon_attr
 484                         = container_of(attr, struct thermal_hwmon_attr, attr);
 485         struct thermal_hwmon_temp *temp
 486                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 487                                        temp_input);
 488         struct thermal_zone_device *tz = temp->tz;
 489
 490         ret = tz->ops->get_temp(tz, &temperature);
 491
 492         if (ret)
 493                 return ret;
 494
 495         return sprintf(buf, "%ld\n", temperature);
 496 }
 497
 498 static ssize_t
 499 temp_crit_show(struct device *dev, struct device_attribute *attr,
 500                 char *buf)
 501 {
 502         struct thermal_hwmon_attr *hwmon_attr
 503                         = container_of(attr, struct thermal_hwmon_attr, attr);
 504         struct thermal_hwmon_temp *temp
 505                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 506                                        temp_crit);
 507         struct thermal_zone_device *tz = temp->tz;
 508         long temperature;
 509         int ret;
 510
 511         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 512         if (ret)
 513                 return ret;
 514
 515         return sprintf(buf, "%ld\n", temperature);
 516 }
 517
 518
 519 static struct thermal_hwmon_device *
 520 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 521 {
 522         struct thermal_hwmon_device *hwmon;
 523
 524         mutex_lock(&thermal_list_lock);
 525         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 526                 if (!strcmp(hwmon->type, tz->type)) {
 527                         mutex_unlock(&thermal_list_lock);
 528                         return hwmon;
 529                 }
 530         mutex_unlock(&thermal_list_lock);
 531
 532         return NULL;
 533 }
 534
 535 /* Find the temperature input matching a given thermal zone */
 536 static struct thermal_hwmon_temp *
 537 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 538                           const struct thermal_zone_device *tz)
 539 {
 540         struct thermal_hwmon_temp *temp;
 541
 542         mutex_lock(&thermal_list_lock);
 543         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 544                 if (temp->tz == tz) {
 545                         mutex_unlock(&thermal_list_lock);
 546                         return temp;
 547                 }
 548         mutex_unlock(&thermal_list_lock);
 549
 550         return NULL;
 551 }
 552
 553 static int
 554 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 555 {
 556         struct thermal_hwmon_device *hwmon;
 557         struct thermal_hwmon_temp *temp;
 558         int new_hwmon_device = 1;
 559         int result;
 560
 561         hwmon = thermal_hwmon_lookup_by_type(tz);
 562         if (hwmon) {
 563                 new_hwmon_device = 0;
 564                 goto register_sys_interface;
 565         }
 566
 567         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 568         if (!hwmon)
 569                 return -ENOMEM;
 570
 571         INIT_LIST_HEAD(&hwmon->tz_list);
 572         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 573         hwmon->device = hwmon_device_register(NULL);
 574         if (IS_ERR(hwmon->device)) {
 575                 result = PTR_ERR(hwmon->device);
 576                 goto free_mem;
 577         }
 578         dev_set_drvdata(hwmon->device, hwmon);
 579         result = device_create_file(hwmon->device, &dev_attr_name);
 580         if (result)
 581                 goto free_mem;
 582
 583  register_sys_interface:
 584         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 585         if (!temp) {
 586                 result = -ENOMEM;
 587                 goto unregister_name;
 588         }
 589
 590         temp->tz = tz;
 591         hwmon->count++;
 592
 593         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
 594                  "temp%d_input", hwmon->count);
 595         temp->temp_input.attr.attr.name = temp->temp_input.name;
 596         temp->temp_input.attr.attr.mode = 0444;
 597         temp->temp_input.attr.show = temp_input_show;
 598         sysfs_attr_init(&temp->temp_input.attr.attr);
 599         result = device_create_file(hwmon->device, &temp->temp_input.attr);
 600         if (result)
 601                 goto free_temp_mem;
 602
 603         if (tz->ops->get_crit_temp) {
 604                 unsigned long temperature;
 605                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 606                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
 607                                 "temp%d_crit", hwmon->count);
 608                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 609                         temp->temp_crit.attr.attr.mode = 0444;
 610                         temp->temp_crit.attr.show = temp_crit_show;
 611                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 612                         result = device_create_file(hwmon->device,
 613                                                     &temp->temp_crit.attr);
 614                         if (result)
 615                                 goto unregister_input;
 616                 }
 617         }
 618
 619         mutex_lock(&thermal_list_lock);
 620         if (new_hwmon_device)
 621                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 622         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 623         mutex_unlock(&thermal_list_lock);
 624
 625         return 0;
 626
 627  unregister_input:
 628         device_remove_file(hwmon->device, &temp->temp_input.attr);
 629  free_temp_mem:
 630         kfree(temp);
 631  unregister_name:
 632         if (new_hwmon_device) {
 633                 device_remove_file(hwmon->device, &dev_attr_name);
 634                 hwmon_device_unregister(hwmon->device);
 635         }
 636  free_mem:
 637         if (new_hwmon_device)
 638                 kfree(hwmon);
 639
 640         return result;
 641 }
 642
 643 static void
 644 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 645 {
 646         struct thermal_hwmon_device *hwmon;
 647         struct thermal_hwmon_temp *temp;
 648
 649         hwmon = thermal_hwmon_lookup_by_type(tz);
 650         if (unlikely(!hwmon)) {
 651                 /* Should never happen... */
 652                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 653                 return;
 654         }
 655
 656         temp = thermal_hwmon_lookup_temp(hwmon, tz);
 657         if (unlikely(!temp)) {
 658                 /* Should never happen... */
 659                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
 660                 return;
 661         }
 662
 663         device_remove_file(hwmon->device, &temp->temp_input.attr);
 664         if (tz->ops->get_crit_temp)
 665                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
 666
 667         mutex_lock(&thermal_list_lock);
 668         list_del(&temp->hwmon_node);
 669         kfree(temp);
 670         if (!list_empty(&hwmon->tz_list)) {
 671                 mutex_unlock(&thermal_list_lock);
 672                 return;
 673         }
 674         list_del(&hwmon->node);
 675         mutex_unlock(&thermal_list_lock);
 676
 677         device_remove_file(hwmon->device, &dev_attr_name);
 678         hwmon_device_unregister(hwmon->device);
 679         kfree(hwmon);
 680 }
 681 #else
 682 static int
 683 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 684 {
 685         return 0;
 686 }
 687
 688 static void
 689 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 690 {
 691 }
 692 #endif
 693
 694 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 695                                             int delay)
 696 {
 697         cancel_delayed_work(&(tz->poll_queue));
 698
 699         if (!delay)
 700                 return;
 701
 702         if (delay > 1000)
 703                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 704                                       round_jiffies(msecs_to_jiffies(delay)));
 705         else
 706                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 707                                       msecs_to_jiffies(delay));
 708 }
 709
 710 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 711                                         int temp, int trip_temp, int trip)
 712 {
 713         int trend = 0;
 714         struct thermal_cooling_device_instance *instance;
 715         struct thermal_cooling_device *cdev;
 716         long state, max_state;
 717
 718         /*
 719          * Above Trip?
 720          * -----------
 721          * Calculate the thermal trend (using the passive cooling equation)
 722          * and modify the performance limit for all passive cooling devices
 723          * accordingly.  Note that we assume symmetry.
 724          */
 725         if (temp >= trip_temp) {
 726                 tz->passive = true;
 727
 728                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 729                         (tz->tc2 * (temp - trip_temp));
 730
 731                 /* Heating up? */
 732                 if (trend > 0) {
 733                         list_for_each_entry(instance, &tz->cooling_devices,
 734                                             node) {
 735                                 if (instance->trip != trip)
 736                                         continue;
 737                                 cdev = instance->cdev;
 738                                 cdev->ops->get_cur_state(cdev, &state);
 739                                 cdev->ops->get_max_state(cdev, &max_state);
 740                                 if (state++ < max_state)
 741                                         cdev->ops->set_cur_state(cdev, state);
 742                         }
 743                 } else if (trend < 0) { /* Cooling off? */
 744                         list_for_each_entry(instance, &tz->cooling_devices,
 745                                             node) {
 746                                 if (instance->trip != trip)
 747                                         continue;
 748                                 cdev = instance->cdev;
 749                                 cdev->ops->get_cur_state(cdev, &state);
 750                                 cdev->ops->get_max_state(cdev, &max_state);
 751                                 if (state > 0)
 752                                         cdev->ops->set_cur_state(cdev, --state);
 753                         }
 754                 }
 755                 return;
 756         }
 757
 758         /*
 759          * Below Trip?
 760          * -----------
 761          * Implement passive cooling hysteresis to slowly increase performance
 762          * and avoid thrashing around the passive trip point.  Note that we
 763          * assume symmetry.
 764          */
 765         list_for_each_entry(instance, &tz->cooling_devices, node) {
 766                 if (instance->trip != trip)
 767                         continue;
 768                 cdev = instance->cdev;
 769                 cdev->ops->get_cur_state(cdev, &state);
 770                 cdev->ops->get_max_state(cdev, &max_state);
 771                 if (state > 0)
 772                         cdev->ops->set_cur_state(cdev, --state);
 773                 if (state == 0)
 774                         tz->passive = false;
 775         }
 776 }
 777
 778 static void thermal_zone_device_check(struct work_struct *work)
 779 {
 780         struct thermal_zone_device *tz = container_of(work, struct
 781                                                       thermal_zone_device,
 782                                                       poll_queue.work);
 783         thermal_zone_device_update(tz);
 784 }
 785
 786 /**
 787  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 788  * @tz:         thermal zone device
 789  * @trip:       indicates which trip point the cooling devices is
 790  *              associated with in this thermal zone.
 791  * @cdev:       thermal cooling device
 792  *
 793  * This function is usually called in the thermal zone device .bind callback.
 794  */
 795 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 796                                      int trip,
 797                                      struct thermal_cooling_device *cdev)
 798 {
 799         struct thermal_cooling_device_instance *dev;
 800         struct thermal_cooling_device_instance *pos;
 801         struct thermal_zone_device *pos1;
 802         struct thermal_cooling_device *pos2;
 803         int result;
 804
 805         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 806                 return -EINVAL;
 807
 808         list_for_each_entry(pos1, &thermal_tz_list, node) {
 809                 if (pos1 == tz)
 810                         break;
 811         }
 812         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 813                 if (pos2 == cdev)
 814                         break;
 815         }
 816
 817         if (tz != pos1 || cdev != pos2)
 818                 return -EINVAL;
 819
 820         dev =
 821             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 822         if (!dev)
 823                 return -ENOMEM;
 824         dev->tz = tz;
 825         dev->cdev = cdev;
 826         dev->trip = trip;
 827         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 828         if (result)
 829                 goto free_mem;
 830
 831         sprintf(dev->name, "cdev%d", dev->id);
 832         result =
 833             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 834         if (result)
 835                 goto release_idr;
 836
 837         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 838         sysfs_attr_init(&dev->attr.attr);
 839         dev->attr.attr.name = dev->attr_name;
 840         dev->attr.attr.mode = 0444;
 841         dev->attr.show = thermal_cooling_device_trip_point_show;
 842         result = device_create_file(&tz->device, &dev->attr);
 843         if (result)
 844                 goto remove_symbol_link;
 845
 846         mutex_lock(&tz->lock);
 847         list_for_each_entry(pos, &tz->cooling_devices, node)
 848             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 849                 result = -EEXIST;
 850                 break;
 851         }
 852         if (!result)
 853                 list_add_tail(&dev->node, &tz->cooling_devices);
 854         mutex_unlock(&tz->lock);
 855
 856         if (!result)
 857                 return 0;
 858
 859         device_remove_file(&tz->device, &dev->attr);
 860 remove_symbol_link:
 861         sysfs_remove_link(&tz->device.kobj, dev->name);
 862 release_idr:
 863         release_idr(&tz->idr, &tz->lock, dev->id);
 864 free_mem:
 865         kfree(dev);
 866         return result;
 867 }
 868 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 869
 870 /**
 871  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 872  * @tz:         thermal zone device
 873  * @trip:       indicates which trip point the cooling devices is
 874  *              associated with in this thermal zone.
 875  * @cdev:       thermal cooling device
 876  *
 877  * This function is usually called in the thermal zone device .unbind callback.
 878  */
 879 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 880                                        int trip,
 881                                        struct thermal_cooling_device *cdev)
 882 {
 883         struct thermal_cooling_device_instance *pos, *next;
 884
 885         mutex_lock(&tz->lock);
 886         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 887                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 888                         list_del(&pos->node);
 889                         mutex_unlock(&tz->lock);
 890                         goto unbind;
 891                 }
 892         }
 893         mutex_unlock(&tz->lock);
 894
 895         return -ENODEV;
 896
 897 unbind:
 898         device_remove_file(&tz->device, &pos->attr);
 899         sysfs_remove_link(&tz->device.kobj, pos->name);
 900         release_idr(&tz->idr, &tz->lock, pos->id);
 901         kfree(pos);
 902         return 0;
 903 }
 904 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 905
 906 static void thermal_release(struct device *dev)
 907 {
 908         struct thermal_zone_device *tz;
 909         struct thermal_cooling_device *cdev;
 910
 911         if (!strncmp(dev_name(dev), "thermal_zone",
 912                      sizeof("thermal_zone") - 1)) {
 913                 tz = to_thermal_zone(dev);
 914                 kfree(tz);
 915         } else {
 916                 cdev = to_cooling_device(dev);
 917                 kfree(cdev);
 918         }
 919 }
 920
 921 static struct class thermal_class = {
 922         .name = "thermal",
 923         .dev_release = thermal_release,
 924 };
 925
 926 /**
 927  * thermal_cooling_device_register - register a new thermal cooling device
 928  * @type:       the thermal cooling device type.
 929  * @devdata:    device private data.
 930  * @ops:                standard thermal cooling devices callbacks.
 931  */
 932 struct thermal_cooling_device *
 933 thermal_cooling_device_register(char *type, void *devdata,
 934                                 const struct thermal_cooling_device_ops *ops)
 935 {
 936         struct thermal_cooling_device *cdev;
 937         struct thermal_zone_device *pos;
 938         int result;
 939
 940         if (strlen(type) >= THERMAL_NAME_LENGTH)
 941                 return ERR_PTR(-EINVAL);
 942
 943         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 944             !ops->set_cur_state)
 945                 return ERR_PTR(-EINVAL);
 946
 947         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 948         if (!cdev)
 949                 return ERR_PTR(-ENOMEM);
 950
 951         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 952         if (result) {
 953                 kfree(cdev);
 954                 return ERR_PTR(result);
 955         }
 956
 957         strcpy(cdev->type, type);
 958         cdev->ops = ops;
 959         cdev->device.class = &thermal_class;
 960         cdev->devdata = devdata;
 961         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 962         result = device_register(&cdev->device);
 963         if (result) {
 964                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 965                 kfree(cdev);
 966                 return ERR_PTR(result);
 967         }
 968
 969         /* sys I/F */
 970         if (type) {
 971                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 972                 if (result)
 973                         goto unregister;
 974         }
 975
 976         result = device_create_file(&cdev->device, &dev_attr_max_state);
 977         if (result)
 978                 goto unregister;
 979
 980         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 981         if (result)
 982                 goto unregister;
 983
 984         mutex_lock(&thermal_list_lock);
 985         list_add(&cdev->node, &thermal_cdev_list);
 986         list_for_each_entry(pos, &thermal_tz_list, node) {
 987                 if (!pos->ops->bind)
 988                         continue;
 989                 result = pos->ops->bind(pos, cdev);
 990                 if (result)
 991                         break;
 992
 993         }
 994         mutex_unlock(&thermal_list_lock);
 995
 996         if (!result)
 997                 return cdev;
 998
 999 unregister:
1000         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1001         device_unregister(&cdev->device);
1002         return ERR_PTR(result);
1003 }
1004 EXPORT_SYMBOL(thermal_cooling_device_register);
1005
1006 /**
1007  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1008  * @cdev:       the thermal cooling device to remove.
1009  *
1010  * thermal_cooling_device_unregister() must be called when the device is no
1011  * longer needed.
1012  */
1013 void thermal_cooling_device_unregister(struct
1014                                        thermal_cooling_device
1015                                        *cdev)
1016 {
1017         struct thermal_zone_device *tz;
1018         struct thermal_cooling_device *pos = NULL;
1019
1020         if (!cdev)
1021                 return;
1022
1023         mutex_lock(&thermal_list_lock);
1024         list_for_each_entry(pos, &thermal_cdev_list, node)
1025             if (pos == cdev)
1026                 break;
1027         if (pos != cdev) {
1028                 /* thermal cooling device not found */
1029                 mutex_unlock(&thermal_list_lock);
1030                 return;
1031         }
1032         list_del(&cdev->node);
1033         list_for_each_entry(tz, &thermal_tz_list, node) {
1034                 if (!tz->ops->unbind)
1035                         continue;
1036                 tz->ops->unbind(tz, cdev);
1037         }
1038         mutex_unlock(&thermal_list_lock);
1039         if (cdev->type[0])
1040                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1041         device_remove_file(&cdev->device, &dev_attr_max_state);
1042         device_remove_file(&cdev->device, &dev_attr_cur_state);
1043
1044         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1045         device_unregister(&cdev->device);
1046         return;
1047 }
1048 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1049
1050 /**
1051  * thermal_zone_device_update - force an update of a thermal zone's state
1052  * @ttz:        the thermal zone to update
1053  */
1054
1055 void thermal_zone_device_update(struct thermal_zone_device *tz)
1056 {
1057         int count, ret = 0;
1058         long temp, trip_temp;
1059         enum thermal_trip_type trip_type;
1060         struct thermal_cooling_device_instance *instance;
1061         struct thermal_cooling_device *cdev;
1062
1063         mutex_lock(&tz->lock);
1064
1065         if (tz->ops->get_temp(tz, &temp)) {
1066                 /* get_temp failed - retry it later */
1067                 pr_warn("failed to read out thermal zone %d\n", tz->id);
1068                 goto leave;
1069         }
1070
1071         for (count = 0; count < tz->trips; count++) {
1072                 tz->ops->get_trip_type(tz, count, &trip_type);
1073                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1074
1075                 switch (trip_type) {
1076                 case THERMAL_TRIP_CRITICAL:
1077                         if (temp >= trip_temp) {
1078                                 if (tz->ops->notify)
1079                                         ret = tz->ops->notify(tz, count,
1080                                                               trip_type);
1081                                 if (!ret) {
1082                                         pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1083                                                  temp/1000);
1084                                         orderly_poweroff(true);
1085                                 }
1086                         }
1087                         break;
1088                 case THERMAL_TRIP_HOT:
1089                         if (temp >= trip_temp)
1090                                 if (tz->ops->notify)
1091                                         tz->ops->notify(tz, count, trip_type);
1092                         break;
1093                 case THERMAL_TRIP_ACTIVE:
1094                         list_for_each_entry(instance, &tz->cooling_devices,
1095                                             node) {
1096                                 if (instance->trip != count)
1097                                         continue;
1098
1099                                 cdev = instance->cdev;
1100
1101                                 if (temp >= trip_temp)
1102                                         cdev->ops->set_cur_state(cdev, 1);
1103                                 else
1104                                         cdev->ops->set_cur_state(cdev, 0);
1105                         }
1106                         break;
1107                 case THERMAL_TRIP_PASSIVE:
1108                         if (temp >= trip_temp || tz->passive)
1109                                 thermal_zone_device_passive(tz, temp,
1110                                                             trip_temp, count);
1111                         break;
1112                 }
1113         }
1114
1115         if (tz->forced_passive)
1116                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1117                                             THERMAL_TRIPS_NONE);
1118
1119         tz->last_temperature = temp;
1120
1121 leave:
1122         if (tz->passive)
1123                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1124         else if (tz->polling_delay)
1125                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1126         else
1127                 thermal_zone_device_set_polling(tz, 0);
1128         mutex_unlock(&tz->lock);
1129 }
1130 EXPORT_SYMBOL(thermal_zone_device_update);
1131
1132 /**
1133  * create_trip_attrs - create attributes for trip points
1134  * @tz:         the thermal zone device
1135  * @mask:       Writeable trip point bitmap.
1136  */
1137 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1138 {
1139         int indx;
1140         int size = sizeof(struct thermal_attr) * tz->trips;
1141
1142         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1143         if (!tz->trip_type_attrs)
1144                 return -ENOMEM;
1145
1146         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1147         if (!tz->trip_temp_attrs) {
1148                 kfree(tz->trip_type_attrs);
1149                 return -ENOMEM;
1150         }
1151
1152         if (tz->ops->get_trip_hyst) {
1153                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1154                 if (!tz->trip_hyst_attrs) {
1155                         kfree(tz->trip_type_attrs);
1156                         kfree(tz->trip_temp_attrs);
1157                         return -ENOMEM;
1158                 }
1159         }
1160
1161
1162         for (indx = 0; indx < tz->trips; indx++) {
1163                 /* create trip type attribute */
1164                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1165                          "trip_point_%d_type", indx);
1166
1167                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1168                 tz->trip_type_attrs[indx].attr.attr.name =
1169                                                 tz->trip_type_attrs[indx].name;
1170                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1171                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1172
1173                 device_create_file(&tz->device,
1174                                    &tz->trip_type_attrs[indx].attr);
1175
1176                 /* create trip temp attribute */
1177                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1178                          "trip_point_%d_temp", indx);
1179
1180                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1181                 tz->trip_temp_attrs[indx].attr.attr.name =
1182                                                 tz->trip_temp_attrs[indx].name;
1183                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1184                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1185                 if (mask & (1 << indx)) {
1186                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1187                         tz->trip_temp_attrs[indx].attr.store =
1188                                                         trip_point_temp_store;
1189                 }
1190
1191                 device_create_file(&tz->device,
1192                                    &tz->trip_temp_attrs[indx].attr);
1193
1194                 /* create Optional trip hyst attribute */
1195                 if (!tz->ops->get_trip_hyst)
1196                         continue;
1197                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1198                          "trip_point_%d_hyst", indx);
1199
1200                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1201                 tz->trip_hyst_attrs[indx].attr.attr.name =
1202                                         tz->trip_hyst_attrs[indx].name;
1203                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1204                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1205                 if (tz->ops->set_trip_hyst) {
1206                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1207                         tz->trip_hyst_attrs[indx].attr.store =
1208                                         trip_point_hyst_store;
1209                 }
1210
1211                 device_create_file(&tz->device,
1212                                    &tz->trip_hyst_attrs[indx].attr);
1213         }
1214         return 0;
1215 }
1216
1217 static void remove_trip_attrs(struct thermal_zone_device *tz)
1218 {
1219         int indx;
1220
1221         for (indx = 0; indx < tz->trips; indx++) {
1222                 device_remove_file(&tz->device,
1223                                    &tz->trip_type_attrs[indx].attr);
1224                 device_remove_file(&tz->device,
1225                                    &tz->trip_temp_attrs[indx].attr);
1226                 if (tz->ops->get_trip_hyst)
1227                         device_remove_file(&tz->device,
1228                                   &tz->trip_hyst_attrs[indx].attr);
1229         }
1230         kfree(tz->trip_type_attrs);
1231         kfree(tz->trip_temp_attrs);
1232         kfree(tz->trip_hyst_attrs);
1233 }
1234
1235 /**
1236  * thermal_zone_device_register - register a new thermal zone device
1237  * @type:       the thermal zone device type
1238  * @trips:      the number of trip points the thermal zone support
1239  * @mask:       a bit string indicating the writeablility of trip points
1240  * @devdata:    private device data
1241  * @ops:        standard thermal zone device callbacks
1242  * @tc1:        thermal coefficient 1 for passive calculations
1243  * @tc2:        thermal coefficient 2 for passive calculations
1244  * @passive_delay: number of milliseconds to wait between polls when
1245  *                 performing passive cooling
1246  * @polling_delay: number of milliseconds to wait between polls when checking
1247  *                 whether trip points have been crossed (0 for interrupt
1248  *                 driven systems)
1249  *
1250  * thermal_zone_device_unregister() must be called when the device is no
1251  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1252  * section 11.1.5.1 of the ACPI specification 3.0.
1253  */
1254 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1255         int trips, int mask, void *devdata,
1256         const struct thermal_zone_device_ops *ops,
1257         int tc1, int tc2, int passive_delay, int polling_delay)
1258 {
1259         struct thermal_zone_device *tz;
1260         struct thermal_cooling_device *pos;
1261         enum thermal_trip_type trip_type;
1262         int result;
1263         int count;
1264         int passive = 0;
1265
1266         if (strlen(type) >= THERMAL_NAME_LENGTH)
1267                 return ERR_PTR(-EINVAL);
1268
1269         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1270                 return ERR_PTR(-EINVAL);
1271
1272         if (!ops || !ops->get_temp)
1273                 return ERR_PTR(-EINVAL);
1274
1275         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1276         if (!tz)
1277                 return ERR_PTR(-ENOMEM);
1278
1279         INIT_LIST_HEAD(&tz->cooling_devices);
1280         idr_init(&tz->idr);
1281         mutex_init(&tz->lock);
1282         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1283         if (result) {
1284                 kfree(tz);
1285                 return ERR_PTR(result);
1286         }
1287
1288         strcpy(tz->type, type);
1289         tz->ops = ops;
1290         tz->device.class = &thermal_class;
1291         tz->devdata = devdata;
1292         tz->trips = trips;
1293         tz->tc1 = tc1;
1294         tz->tc2 = tc2;
1295         tz->passive_delay = passive_delay;
1296         tz->polling_delay = polling_delay;
1297
1298         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1299         result = device_register(&tz->device);
1300         if (result) {
1301                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1302                 kfree(tz);
1303                 return ERR_PTR(result);
1304         }
1305
1306         /* sys I/F */
1307         if (type) {
1308                 result = device_create_file(&tz->device, &dev_attr_type);
1309                 if (result)
1310                         goto unregister;
1311         }
1312
1313         result = device_create_file(&tz->device, &dev_attr_temp);
1314         if (result)
1315                 goto unregister;
1316
1317         if (ops->get_mode) {
1318                 result = device_create_file(&tz->device, &dev_attr_mode);
1319                 if (result)
1320                         goto unregister;
1321         }
1322
1323         result = create_trip_attrs(tz, mask);
1324         if (result)
1325                 goto unregister;
1326
1327         for (count = 0; count < trips; count++) {
1328                 tz->ops->get_trip_type(tz, count, &trip_type);
1329                 if (trip_type == THERMAL_TRIP_PASSIVE)
1330                         passive = 1;
1331         }
1332
1333         if (!passive)
1334                 result = device_create_file(&tz->device,
1335                                             &dev_attr_passive);
1336
1337         if (result)
1338                 goto unregister;
1339
1340         result = thermal_add_hwmon_sysfs(tz);
1341         if (result)
1342                 goto unregister;
1343
1344         mutex_lock(&thermal_list_lock);
1345         list_add_tail(&tz->node, &thermal_tz_list);
1346         if (ops->bind)
1347                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1348                 result = ops->bind(tz, pos);
1349                 if (result)
1350                         break;
1351                 }
1352         mutex_unlock(&thermal_list_lock);
1353
1354         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1355
1356         thermal_zone_device_update(tz);
1357
1358         if (!result)
1359                 return tz;
1360
1361 unregister:
1362         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1363         device_unregister(&tz->device);
1364         return ERR_PTR(result);
1365 }
1366 EXPORT_SYMBOL(thermal_zone_device_register);
1367
1368 /**
1369  * thermal_device_unregister - removes the registered thermal zone device
1370  * @tz: the thermal zone device to remove
1371  */
1372 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1373 {
1374         struct thermal_cooling_device *cdev;
1375         struct thermal_zone_device *pos = NULL;
1376
1377         if (!tz)
1378                 return;
1379
1380         mutex_lock(&thermal_list_lock);
1381         list_for_each_entry(pos, &thermal_tz_list, node)
1382             if (pos == tz)
1383                 break;
1384         if (pos != tz) {
1385                 /* thermal zone device not found */
1386                 mutex_unlock(&thermal_list_lock);
1387                 return;
1388         }
1389         list_del(&tz->node);
1390         if (tz->ops->unbind)
1391                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1392                     tz->ops->unbind(tz, cdev);
1393         mutex_unlock(&thermal_list_lock);
1394
1395         thermal_zone_device_set_polling(tz, 0);
1396
1397         if (tz->type[0])
1398                 device_remove_file(&tz->device, &dev_attr_type);
1399         device_remove_file(&tz->device, &dev_attr_temp);
1400         if (tz->ops->get_mode)
1401                 device_remove_file(&tz->device, &dev_attr_mode);
1402         remove_trip_attrs(tz);
1403
1404         thermal_remove_hwmon_sysfs(tz);
1405         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1406         idr_destroy(&tz->idr);
1407         mutex_destroy(&tz->lock);
1408         device_unregister(&tz->device);
1409         return;
1410 }
1411 EXPORT_SYMBOL(thermal_zone_device_unregister);
1412
1413 #ifdef CONFIG_NET
1414 static struct genl_family thermal_event_genl_family = {
1415         .id = GENL_ID_GENERATE,
1416         .name = THERMAL_GENL_FAMILY_NAME,
1417         .version = THERMAL_GENL_VERSION,
1418         .maxattr = THERMAL_GENL_ATTR_MAX,
1419 };
1420
1421 static struct genl_multicast_group thermal_event_mcgrp = {
1422         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1423 };
1424
1425 int thermal_generate_netlink_event(u32 orig, enum events event)
1426 {
1427         struct sk_buff *skb;
1428         struct nlattr *attr;
1429         struct thermal_genl_event *thermal_event;
1430         void *msg_header;
1431         int size;
1432         int result;
1433         static unsigned int thermal_event_seqnum;
1434
1435         /* allocate memory */
1436         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1437                nla_total_size(0);
1438
1439         skb = genlmsg_new(size, GFP_ATOMIC);
1440         if (!skb)
1441                 return -ENOMEM;
1442
1443         /* add the genetlink message header */
1444         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1445                                  &thermal_event_genl_family, 0,
1446                                  THERMAL_GENL_CMD_EVENT);
1447         if (!msg_header) {
1448                 nlmsg_free(skb);
1449                 return -ENOMEM;
1450         }
1451
1452         /* fill the data */
1453         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1454                            sizeof(struct thermal_genl_event));
1455
1456         if (!attr) {
1457                 nlmsg_free(skb);
1458                 return -EINVAL;
1459         }
1460
1461         thermal_event = nla_data(attr);
1462         if (!thermal_event) {
1463                 nlmsg_free(skb);
1464                 return -EINVAL;
1465         }
1466
1467         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1468
1469         thermal_event->orig = orig;
1470         thermal_event->event = event;
1471
1472         /* send multicast genetlink message */
1473         result = genlmsg_end(skb, msg_header);
1474         if (result < 0) {
1475                 nlmsg_free(skb);
1476                 return result;
1477         }
1478
1479         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1480         if (result)
1481                 pr_info("failed to send netlink event:%d\n", result);
1482
1483         return result;
1484 }
1485 EXPORT_SYMBOL(thermal_generate_netlink_event);
1486
1487 static int genetlink_init(void)
1488 {
1489         int result;
1490
1491         result = genl_register_family(&thermal_event_genl_family);
1492         if (result)
1493                 return result;
1494
1495         result = genl_register_mc_group(&thermal_event_genl_family,
1496                                         &thermal_event_mcgrp);
1497         if (result)
1498                 genl_unregister_family(&thermal_event_genl_family);
1499         return result;
1500 }
1501
1502 static void genetlink_exit(void)
1503 {
1504         genl_unregister_family(&thermal_event_genl_family);
1505 }
1506 #else /* !CONFIG_NET */
1507 static inline int genetlink_init(void) { return 0; }
1508 static inline void genetlink_exit(void) {}
1509 #endif /* !CONFIG_NET */
1510
1511 static int __init thermal_init(void)
1512 {
1513         int result = 0;
1514
1515         result = class_register(&thermal_class);
1516         if (result) {
1517                 idr_destroy(&thermal_tz_idr);
1518                 idr_destroy(&thermal_cdev_idr);
1519                 mutex_destroy(&thermal_idr_lock);
1520                 mutex_destroy(&thermal_list_lock);
1521         }
1522         result = genetlink_init();
1523         return result;
1524 }
1525
1526 static void __exit thermal_exit(void)
1527 {
1528         class_unregister(&thermal_class);
1529         idr_destroy(&thermal_tz_idr);
1530         idr_destroy(&thermal_cdev_idr);
1531         mutex_destroy(&thermal_idr_lock);
1532         mutex_destroy(&thermal_list_lock);
1533         genetlink_exit();
1534 }
1535
1536 fs_initcall(thermal_init);
1537 module_exit(thermal_exit);