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 /*
  45  * This structure is used to describe the behavior of
  46  * a certain cooling device on a certain trip point
  47  * in a certain thermal zone
  48  */
  49 struct thermal_cooling_device_instance {
  50         int id;
  51         char name[THERMAL_NAME_LENGTH];
  52         struct thermal_zone_device *tz;
  53         struct thermal_cooling_device *cdev;
  54         int trip;
  55         unsigned long upper;    /* Highest cooling state for this trip point */
  56         unsigned long lower;    /* Lowest cooling state for this trip point */
  57         char attr_name[THERMAL_NAME_LENGTH];
  58         struct device_attribute attr;
  59         struct list_head node;
  60 };
  61
  62 static DEFINE_IDR(thermal_tz_idr);
  63 static DEFINE_IDR(thermal_cdev_idr);
  64 static DEFINE_MUTEX(thermal_idr_lock);
  65
  66 static LIST_HEAD(thermal_tz_list);
  67 static LIST_HEAD(thermal_cdev_list);
  68 static DEFINE_MUTEX(thermal_list_lock);
  69
  70 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  71 {
  72         int err;
  73
  74 again:
  75         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  76                 return -ENOMEM;
  77
  78         if (lock)
  79                 mutex_lock(lock);
  80         err = idr_get_new(idr, NULL, id);
  81         if (lock)
  82                 mutex_unlock(lock);
  83         if (unlikely(err == -EAGAIN))
  84                 goto again;
  85         else if (unlikely(err))
  86                 return err;
  87
  88         *id = *id & MAX_ID_MASK;
  89         return 0;
  90 }
  91
  92 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  93 {
  94         if (lock)
  95                 mutex_lock(lock);
  96         idr_remove(idr, id);
  97         if (lock)
  98                 mutex_unlock(lock);
  99 }
 100
 101 /* sys I/F for thermal zone */
 102
 103 #define to_thermal_zone(_dev) \
 104         container_of(_dev, struct thermal_zone_device, device)
 105
 106 static ssize_t
 107 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 108 {
 109         struct thermal_zone_device *tz = to_thermal_zone(dev);
 110
 111         return sprintf(buf, "%s\n", tz->type);
 112 }
 113
 114 static ssize_t
 115 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 116 {
 117         struct thermal_zone_device *tz = to_thermal_zone(dev);
 118         long temperature;
 119         int ret;
 120
 121         if (!tz->ops->get_temp)
 122                 return -EPERM;
 123
 124         ret = tz->ops->get_temp(tz, &temperature);
 125
 126         if (ret)
 127                 return ret;
 128
 129         return sprintf(buf, "%ld\n", temperature);
 130 }
 131
 132 static ssize_t
 133 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 134 {
 135         struct thermal_zone_device *tz = to_thermal_zone(dev);
 136         enum thermal_device_mode mode;
 137         int result;
 138
 139         if (!tz->ops->get_mode)
 140                 return -EPERM;
 141
 142         result = tz->ops->get_mode(tz, &mode);
 143         if (result)
 144                 return result;
 145
 146         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 147                        : "disabled");
 148 }
 149
 150 static ssize_t
 151 mode_store(struct device *dev, struct device_attribute *attr,
 152            const char *buf, size_t count)
 153 {
 154         struct thermal_zone_device *tz = to_thermal_zone(dev);
 155         int result;
 156
 157         if (!tz->ops->set_mode)
 158                 return -EPERM;
 159
 160         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 161                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 162         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 163                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 164         else
 165                 result = -EINVAL;
 166
 167         if (result)
 168                 return result;
 169
 170         return count;
 171 }
 172
 173 static ssize_t
 174 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 175                      char *buf)
 176 {
 177         struct thermal_zone_device *tz = to_thermal_zone(dev);
 178         enum thermal_trip_type type;
 179         int trip, result;
 180
 181         if (!tz->ops->get_trip_type)
 182                 return -EPERM;
 183
 184         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 185                 return -EINVAL;
 186
 187         result = tz->ops->get_trip_type(tz, trip, &type);
 188         if (result)
 189                 return result;
 190
 191         switch (type) {
 192         case THERMAL_TRIP_CRITICAL:
 193                 return sprintf(buf, "critical\n");
 194         case THERMAL_TRIP_HOT:
 195                 return sprintf(buf, "hot\n");
 196         case THERMAL_TRIP_PASSIVE:
 197                 return sprintf(buf, "passive\n");
 198         case THERMAL_TRIP_ACTIVE:
 199                 return sprintf(buf, "active\n");
 200         default:
 201                 return sprintf(buf, "unknown\n");
 202         }
 203 }
 204
 205 static ssize_t
 206 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 207                      const char *buf, size_t count)
 208 {
 209         struct thermal_zone_device *tz = to_thermal_zone(dev);
 210         int trip, ret;
 211         unsigned long temperature;
 212
 213         if (!tz->ops->set_trip_temp)
 214                 return -EPERM;
 215
 216         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 217                 return -EINVAL;
 218
 219         if (kstrtoul(buf, 10, &temperature))
 220                 return -EINVAL;
 221
 222         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 223
 224         return ret ? ret : count;
 225 }
 226
 227 static ssize_t
 228 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 229                      char *buf)
 230 {
 231         struct thermal_zone_device *tz = to_thermal_zone(dev);
 232         int trip, ret;
 233         long temperature;
 234
 235         if (!tz->ops->get_trip_temp)
 236                 return -EPERM;
 237
 238         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 239                 return -EINVAL;
 240
 241         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 242
 243         if (ret)
 244                 return ret;
 245
 246         return sprintf(buf, "%ld\n", temperature);
 247 }
 248
 249 static ssize_t
 250 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 251                         const char *buf, size_t count)
 252 {
 253         struct thermal_zone_device *tz = to_thermal_zone(dev);
 254         int trip, ret;
 255         unsigned long temperature;
 256
 257         if (!tz->ops->set_trip_hyst)
 258                 return -EPERM;
 259
 260         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 261                 return -EINVAL;
 262
 263         if (kstrtoul(buf, 10, &temperature))
 264                 return -EINVAL;
 265
 266         /*
 267          * We are not doing any check on the 'temperature' value
 268          * here. The driver implementing 'set_trip_hyst' has to
 269          * take care of this.
 270          */
 271         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 272
 273         return ret ? ret : count;
 274 }
 275
 276 static ssize_t
 277 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 278                         char *buf)
 279 {
 280         struct thermal_zone_device *tz = to_thermal_zone(dev);
 281         int trip, ret;
 282         unsigned long temperature;
 283
 284         if (!tz->ops->get_trip_hyst)
 285                 return -EPERM;
 286
 287         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 288                 return -EINVAL;
 289
 290         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 291
 292         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 293 }
 294
 295 static ssize_t
 296 passive_store(struct device *dev, struct device_attribute *attr,
 297                     const char *buf, size_t count)
 298 {
 299         struct thermal_zone_device *tz = to_thermal_zone(dev);
 300         struct thermal_cooling_device *cdev = NULL;
 301         int state;
 302
 303         if (!sscanf(buf, "%d\n", &state))
 304                 return -EINVAL;
 305
 306         /* sanity check: values below 1000 millicelcius don't make sense
 307          * and can cause the system to go into a thermal heart attack
 308          */
 309         if (state && state < 1000)
 310                 return -EINVAL;
 311
 312         if (state && !tz->forced_passive) {
 313                 mutex_lock(&thermal_list_lock);
 314                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 315                         if (!strncmp("Processor", cdev->type,
 316                                      sizeof("Processor")))
 317                                 thermal_zone_bind_cooling_device(tz,
 318                                                 THERMAL_TRIPS_NONE, cdev,
 319                                                 THERMAL_NO_LIMIT,
 320                                                 THERMAL_NO_LIMIT);
 321                 }
 322                 mutex_unlock(&thermal_list_lock);
 323                 if (!tz->passive_delay)
 324                         tz->passive_delay = 1000;
 325         } else if (!state && tz->forced_passive) {
 326                 mutex_lock(&thermal_list_lock);
 327                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 328                         if (!strncmp("Processor", cdev->type,
 329                                      sizeof("Processor")))
 330                                 thermal_zone_unbind_cooling_device(tz,
 331                                                                    THERMAL_TRIPS_NONE,
 332                                                                    cdev);
 333                 }
 334                 mutex_unlock(&thermal_list_lock);
 335                 tz->passive_delay = 0;
 336         }
 337
 338         tz->tc1 = 1;
 339         tz->tc2 = 1;
 340
 341         tz->forced_passive = state;
 342
 343         thermal_zone_device_update(tz);
 344
 345         return count;
 346 }
 347
 348 static ssize_t
 349 passive_show(struct device *dev, struct device_attribute *attr,
 350                    char *buf)
 351 {
 352         struct thermal_zone_device *tz = to_thermal_zone(dev);
 353
 354         return sprintf(buf, "%d\n", tz->forced_passive);
 355 }
 356
 357 static DEVICE_ATTR(type, 0444, type_show, NULL);
 358 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 359 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 360 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 361
 362 /* sys I/F for cooling device */
 363 #define to_cooling_device(_dev) \
 364         container_of(_dev, struct thermal_cooling_device, device)
 365
 366 static ssize_t
 367 thermal_cooling_device_type_show(struct device *dev,
 368                                  struct device_attribute *attr, char *buf)
 369 {
 370         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 371
 372         return sprintf(buf, "%s\n", cdev->type);
 373 }
 374
 375 static ssize_t
 376 thermal_cooling_device_max_state_show(struct device *dev,
 377                                       struct device_attribute *attr, char *buf)
 378 {
 379         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 380         unsigned long state;
 381         int ret;
 382
 383         ret = cdev->ops->get_max_state(cdev, &state);
 384         if (ret)
 385                 return ret;
 386         return sprintf(buf, "%ld\n", state);
 387 }
 388
 389 static ssize_t
 390 thermal_cooling_device_cur_state_show(struct device *dev,
 391                                       struct device_attribute *attr, char *buf)
 392 {
 393         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 394         unsigned long state;
 395         int ret;
 396
 397         ret = cdev->ops->get_cur_state(cdev, &state);
 398         if (ret)
 399                 return ret;
 400         return sprintf(buf, "%ld\n", state);
 401 }
 402
 403 static ssize_t
 404 thermal_cooling_device_cur_state_store(struct device *dev,
 405                                        struct device_attribute *attr,
 406                                        const char *buf, size_t count)
 407 {
 408         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 409         unsigned long state;
 410         int result;
 411
 412         if (!sscanf(buf, "%ld\n", &state))
 413                 return -EINVAL;
 414
 415         if ((long)state < 0)
 416                 return -EINVAL;
 417
 418         result = cdev->ops->set_cur_state(cdev, state);
 419         if (result)
 420                 return result;
 421         return count;
 422 }
 423
 424 static struct device_attribute dev_attr_cdev_type =
 425 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 426 static DEVICE_ATTR(max_state, 0444,
 427                    thermal_cooling_device_max_state_show, NULL);
 428 static DEVICE_ATTR(cur_state, 0644,
 429                    thermal_cooling_device_cur_state_show,
 430                    thermal_cooling_device_cur_state_store);
 431
 432 static ssize_t
 433 thermal_cooling_device_trip_point_show(struct device *dev,
 434                                        struct device_attribute *attr, char *buf)
 435 {
 436         struct thermal_cooling_device_instance *instance;
 437
 438         instance =
 439             container_of(attr, struct thermal_cooling_device_instance, attr);
 440
 441         if (instance->trip == THERMAL_TRIPS_NONE)
 442                 return sprintf(buf, "-1\n");
 443         else
 444                 return sprintf(buf, "%d\n", instance->trip);
 445 }
 446
 447 /* Device management */
 448
 449 #if defined(CONFIG_THERMAL_HWMON)
 450
 451 /* hwmon sys I/F */
 452 #include <linux/hwmon.h>
 453
 454 /* thermal zone devices with the same type share one hwmon device */
 455 struct thermal_hwmon_device {
 456         char type[THERMAL_NAME_LENGTH];
 457         struct device *device;
 458         int count;
 459         struct list_head tz_list;
 460         struct list_head node;
 461 };
 462
 463 struct thermal_hwmon_attr {
 464         struct device_attribute attr;
 465         char name[16];
 466 };
 467
 468 /* one temperature input for each thermal zone */
 469 struct thermal_hwmon_temp {
 470         struct list_head hwmon_node;
 471         struct thermal_zone_device *tz;
 472         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 473         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 474 };
 475
 476 static LIST_HEAD(thermal_hwmon_list);
 477
 478 static ssize_t
 479 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 480 {
 481         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 482         return sprintf(buf, "%s\n", hwmon->type);
 483 }
 484 static DEVICE_ATTR(name, 0444, name_show, NULL);
 485
 486 static ssize_t
 487 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 488 {
 489         long temperature;
 490         int ret;
 491         struct thermal_hwmon_attr *hwmon_attr
 492                         = container_of(attr, struct thermal_hwmon_attr, attr);
 493         struct thermal_hwmon_temp *temp
 494                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 495                                        temp_input);
 496         struct thermal_zone_device *tz = temp->tz;
 497
 498         ret = tz->ops->get_temp(tz, &temperature);
 499
 500         if (ret)
 501                 return ret;
 502
 503         return sprintf(buf, "%ld\n", temperature);
 504 }
 505
 506 static ssize_t
 507 temp_crit_show(struct device *dev, struct device_attribute *attr,
 508                 char *buf)
 509 {
 510         struct thermal_hwmon_attr *hwmon_attr
 511                         = container_of(attr, struct thermal_hwmon_attr, attr);
 512         struct thermal_hwmon_temp *temp
 513                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 514                                        temp_crit);
 515         struct thermal_zone_device *tz = temp->tz;
 516         long temperature;
 517         int ret;
 518
 519         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 520         if (ret)
 521                 return ret;
 522
 523         return sprintf(buf, "%ld\n", temperature);
 524 }
 525
 526
 527 static struct thermal_hwmon_device *
 528 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 529 {
 530         struct thermal_hwmon_device *hwmon;
 531
 532         mutex_lock(&thermal_list_lock);
 533         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 534                 if (!strcmp(hwmon->type, tz->type)) {
 535                         mutex_unlock(&thermal_list_lock);
 536                         return hwmon;
 537                 }
 538         mutex_unlock(&thermal_list_lock);
 539
 540         return NULL;
 541 }
 542
 543 /* Find the temperature input matching a given thermal zone */
 544 static struct thermal_hwmon_temp *
 545 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 546                           const struct thermal_zone_device *tz)
 547 {
 548         struct thermal_hwmon_temp *temp;
 549
 550         mutex_lock(&thermal_list_lock);
 551         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 552                 if (temp->tz == tz) {
 553                         mutex_unlock(&thermal_list_lock);
 554                         return temp;
 555                 }
 556         mutex_unlock(&thermal_list_lock);
 557
 558         return NULL;
 559 }
 560
 561 static int
 562 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 563 {
 564         struct thermal_hwmon_device *hwmon;
 565         struct thermal_hwmon_temp *temp;
 566         int new_hwmon_device = 1;
 567         int result;
 568
 569         hwmon = thermal_hwmon_lookup_by_type(tz);
 570         if (hwmon) {
 571                 new_hwmon_device = 0;
 572                 goto register_sys_interface;
 573         }
 574
 575         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 576         if (!hwmon)
 577                 return -ENOMEM;
 578
 579         INIT_LIST_HEAD(&hwmon->tz_list);
 580         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 581         hwmon->device = hwmon_device_register(NULL);
 582         if (IS_ERR(hwmon->device)) {
 583                 result = PTR_ERR(hwmon->device);
 584                 goto free_mem;
 585         }
 586         dev_set_drvdata(hwmon->device, hwmon);
 587         result = device_create_file(hwmon->device, &dev_attr_name);
 588         if (result)
 589                 goto free_mem;
 590
 591  register_sys_interface:
 592         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 593         if (!temp) {
 594                 result = -ENOMEM;
 595                 goto unregister_name;
 596         }
 597
 598         temp->tz = tz;
 599         hwmon->count++;
 600
 601         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
 602                  "temp%d_input", hwmon->count);
 603         temp->temp_input.attr.attr.name = temp->temp_input.name;
 604         temp->temp_input.attr.attr.mode = 0444;
 605         temp->temp_input.attr.show = temp_input_show;
 606         sysfs_attr_init(&temp->temp_input.attr.attr);
 607         result = device_create_file(hwmon->device, &temp->temp_input.attr);
 608         if (result)
 609                 goto free_temp_mem;
 610
 611         if (tz->ops->get_crit_temp) {
 612                 unsigned long temperature;
 613                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 614                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
 615                                 "temp%d_crit", hwmon->count);
 616                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 617                         temp->temp_crit.attr.attr.mode = 0444;
 618                         temp->temp_crit.attr.show = temp_crit_show;
 619                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 620                         result = device_create_file(hwmon->device,
 621                                                     &temp->temp_crit.attr);
 622                         if (result)
 623                                 goto unregister_input;
 624                 }
 625         }
 626
 627         mutex_lock(&thermal_list_lock);
 628         if (new_hwmon_device)
 629                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 630         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 631         mutex_unlock(&thermal_list_lock);
 632
 633         return 0;
 634
 635  unregister_input:
 636         device_remove_file(hwmon->device, &temp->temp_input.attr);
 637  free_temp_mem:
 638         kfree(temp);
 639  unregister_name:
 640         if (new_hwmon_device) {
 641                 device_remove_file(hwmon->device, &dev_attr_name);
 642                 hwmon_device_unregister(hwmon->device);
 643         }
 644  free_mem:
 645         if (new_hwmon_device)
 646                 kfree(hwmon);
 647
 648         return result;
 649 }
 650
 651 static void
 652 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 653 {
 654         struct thermal_hwmon_device *hwmon;
 655         struct thermal_hwmon_temp *temp;
 656
 657         hwmon = thermal_hwmon_lookup_by_type(tz);
 658         if (unlikely(!hwmon)) {
 659                 /* Should never happen... */
 660                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 661                 return;
 662         }
 663
 664         temp = thermal_hwmon_lookup_temp(hwmon, tz);
 665         if (unlikely(!temp)) {
 666                 /* Should never happen... */
 667                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
 668                 return;
 669         }
 670
 671         device_remove_file(hwmon->device, &temp->temp_input.attr);
 672         if (tz->ops->get_crit_temp)
 673                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
 674
 675         mutex_lock(&thermal_list_lock);
 676         list_del(&temp->hwmon_node);
 677         kfree(temp);
 678         if (!list_empty(&hwmon->tz_list)) {
 679                 mutex_unlock(&thermal_list_lock);
 680                 return;
 681         }
 682         list_del(&hwmon->node);
 683         mutex_unlock(&thermal_list_lock);
 684
 685         device_remove_file(hwmon->device, &dev_attr_name);
 686         hwmon_device_unregister(hwmon->device);
 687         kfree(hwmon);
 688 }
 689 #else
 690 static int
 691 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 692 {
 693         return 0;
 694 }
 695
 696 static void
 697 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 698 {
 699 }
 700 #endif
 701
 702 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 703                                             int delay)
 704 {
 705         cancel_delayed_work(&(tz->poll_queue));
 706
 707         if (!delay)
 708                 return;
 709
 710         if (delay > 1000)
 711                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 712                                       round_jiffies(msecs_to_jiffies(delay)));
 713         else
 714                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 715                                       msecs_to_jiffies(delay));
 716 }
 717
 718 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 719                                         int temp, int trip_temp, int trip)
 720 {
 721         int trend = 0;
 722         struct thermal_cooling_device_instance *instance;
 723         struct thermal_cooling_device *cdev;
 724         long state, max_state;
 725
 726         /*
 727          * Above Trip?
 728          * -----------
 729          * Calculate the thermal trend (using the passive cooling equation)
 730          * and modify the performance limit for all passive cooling devices
 731          * accordingly.  Note that we assume symmetry.
 732          */
 733         if (temp >= trip_temp) {
 734                 tz->passive = true;
 735
 736                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 737                         (tz->tc2 * (temp - trip_temp));
 738
 739                 /* Heating up? */
 740                 if (trend > 0) {
 741                         list_for_each_entry(instance, &tz->cooling_devices,
 742                                             node) {
 743                                 if (instance->trip != trip)
 744                                         continue;
 745                                 cdev = instance->cdev;
 746                                 cdev->ops->get_cur_state(cdev, &state);
 747                                 cdev->ops->get_max_state(cdev, &max_state);
 748                                 if (state++ < max_state)
 749                                         cdev->ops->set_cur_state(cdev, state);
 750                         }
 751                 } else if (trend < 0) { /* Cooling off? */
 752                         list_for_each_entry(instance, &tz->cooling_devices,
 753                                             node) {
 754                                 if (instance->trip != trip)
 755                                         continue;
 756                                 cdev = instance->cdev;
 757                                 cdev->ops->get_cur_state(cdev, &state);
 758                                 cdev->ops->get_max_state(cdev, &max_state);
 759                                 if (state > 0)
 760                                         cdev->ops->set_cur_state(cdev, --state);
 761                         }
 762                 }
 763                 return;
 764         }
 765
 766         /*
 767          * Below Trip?
 768          * -----------
 769          * Implement passive cooling hysteresis to slowly increase performance
 770          * and avoid thrashing around the passive trip point.  Note that we
 771          * assume symmetry.
 772          */
 773         list_for_each_entry(instance, &tz->cooling_devices, node) {
 774                 if (instance->trip != trip)
 775                         continue;
 776                 cdev = instance->cdev;
 777                 cdev->ops->get_cur_state(cdev, &state);
 778                 cdev->ops->get_max_state(cdev, &max_state);
 779                 if (state > 0)
 780                         cdev->ops->set_cur_state(cdev, --state);
 781                 if (state == 0)
 782                         tz->passive = false;
 783         }
 784 }
 785
 786 static void thermal_zone_device_check(struct work_struct *work)
 787 {
 788         struct thermal_zone_device *tz = container_of(work, struct
 789                                                       thermal_zone_device,
 790                                                       poll_queue.work);
 791         thermal_zone_device_update(tz);
 792 }
 793
 794 /**
 795  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 796  * @tz:         thermal zone device
 797  * @trip:       indicates which trip point the cooling devices is
 798  *              associated with in this thermal zone.
 799  * @cdev:       thermal cooling device
 800  *
 801  * This function is usually called in the thermal zone device .bind callback.
 802  */
 803 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 804                                      int trip,
 805                                      struct thermal_cooling_device *cdev,
 806                                      unsigned long upper, unsigned long lower)
 807 {
 808         struct thermal_cooling_device_instance *dev;
 809         struct thermal_cooling_device_instance *pos;
 810         struct thermal_zone_device *pos1;
 811         struct thermal_cooling_device *pos2;
 812         unsigned long max_state;
 813         int result;
 814
 815         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 816                 return -EINVAL;
 817
 818         list_for_each_entry(pos1, &thermal_tz_list, node) {
 819                 if (pos1 == tz)
 820                         break;
 821         }
 822         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 823                 if (pos2 == cdev)
 824                         break;
 825         }
 826
 827         if (tz != pos1 || cdev != pos2)
 828                 return -EINVAL;
 829
 830         cdev->ops->get_max_state(cdev, &max_state);
 831
 832         /* lower default 0, upper default max_state */
 833         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 834         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 835
 836         if (lower > upper || upper > max_state)
 837                 return -EINVAL;
 838
 839         dev =
 840             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 841         if (!dev)
 842                 return -ENOMEM;
 843         dev->tz = tz;
 844         dev->cdev = cdev;
 845         dev->trip = trip;
 846         dev->upper = upper;
 847         dev->lower = lower;
 848
 849         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 850         if (result)
 851                 goto free_mem;
 852
 853         sprintf(dev->name, "cdev%d", dev->id);
 854         result =
 855             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 856         if (result)
 857                 goto release_idr;
 858
 859         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 860         sysfs_attr_init(&dev->attr.attr);
 861         dev->attr.attr.name = dev->attr_name;
 862         dev->attr.attr.mode = 0444;
 863         dev->attr.show = thermal_cooling_device_trip_point_show;
 864         result = device_create_file(&tz->device, &dev->attr);
 865         if (result)
 866                 goto remove_symbol_link;
 867
 868         mutex_lock(&tz->lock);
 869         list_for_each_entry(pos, &tz->cooling_devices, node)
 870             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 871                 result = -EEXIST;
 872                 break;
 873         }
 874         if (!result)
 875                 list_add_tail(&dev->node, &tz->cooling_devices);
 876         mutex_unlock(&tz->lock);
 877
 878         if (!result)
 879                 return 0;
 880
 881         device_remove_file(&tz->device, &dev->attr);
 882 remove_symbol_link:
 883         sysfs_remove_link(&tz->device.kobj, dev->name);
 884 release_idr:
 885         release_idr(&tz->idr, &tz->lock, dev->id);
 886 free_mem:
 887         kfree(dev);
 888         return result;
 889 }
 890 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 891
 892 /**
 893  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 894  * @tz:         thermal zone device
 895  * @trip:       indicates which trip point the cooling devices is
 896  *              associated with in this thermal zone.
 897  * @cdev:       thermal cooling device
 898  *
 899  * This function is usually called in the thermal zone device .unbind callback.
 900  */
 901 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 902                                        int trip,
 903                                        struct thermal_cooling_device *cdev)
 904 {
 905         struct thermal_cooling_device_instance *pos, *next;
 906
 907         mutex_lock(&tz->lock);
 908         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 909                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 910                         list_del(&pos->node);
 911                         mutex_unlock(&tz->lock);
 912                         goto unbind;
 913                 }
 914         }
 915         mutex_unlock(&tz->lock);
 916
 917         return -ENODEV;
 918
 919 unbind:
 920         device_remove_file(&tz->device, &pos->attr);
 921         sysfs_remove_link(&tz->device.kobj, pos->name);
 922         release_idr(&tz->idr, &tz->lock, pos->id);
 923         kfree(pos);
 924         return 0;
 925 }
 926 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 927
 928 static void thermal_release(struct device *dev)
 929 {
 930         struct thermal_zone_device *tz;
 931         struct thermal_cooling_device *cdev;
 932
 933         if (!strncmp(dev_name(dev), "thermal_zone",
 934                      sizeof("thermal_zone") - 1)) {
 935                 tz = to_thermal_zone(dev);
 936                 kfree(tz);
 937         } else {
 938                 cdev = to_cooling_device(dev);
 939                 kfree(cdev);
 940         }
 941 }
 942
 943 static struct class thermal_class = {
 944         .name = "thermal",
 945         .dev_release = thermal_release,
 946 };
 947
 948 /**
 949  * thermal_cooling_device_register - register a new thermal cooling device
 950  * @type:       the thermal cooling device type.
 951  * @devdata:    device private data.
 952  * @ops:                standard thermal cooling devices callbacks.
 953  */
 954 struct thermal_cooling_device *
 955 thermal_cooling_device_register(char *type, void *devdata,
 956                                 const struct thermal_cooling_device_ops *ops)
 957 {
 958         struct thermal_cooling_device *cdev;
 959         struct thermal_zone_device *pos;
 960         int result;
 961
 962         if (strlen(type) >= THERMAL_NAME_LENGTH)
 963                 return ERR_PTR(-EINVAL);
 964
 965         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 966             !ops->set_cur_state)
 967                 return ERR_PTR(-EINVAL);
 968
 969         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 970         if (!cdev)
 971                 return ERR_PTR(-ENOMEM);
 972
 973         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 974         if (result) {
 975                 kfree(cdev);
 976                 return ERR_PTR(result);
 977         }
 978
 979         strcpy(cdev->type, type);
 980         cdev->ops = ops;
 981         cdev->device.class = &thermal_class;
 982         cdev->devdata = devdata;
 983         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 984         result = device_register(&cdev->device);
 985         if (result) {
 986                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 987                 kfree(cdev);
 988                 return ERR_PTR(result);
 989         }
 990
 991         /* sys I/F */
 992         if (type) {
 993                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 994                 if (result)
 995                         goto unregister;
 996         }
 997
 998         result = device_create_file(&cdev->device, &dev_attr_max_state);
 999         if (result)
1000                 goto unregister;
1001
1002         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1003         if (result)
1004                 goto unregister;
1005
1006         mutex_lock(&thermal_list_lock);
1007         list_add(&cdev->node, &thermal_cdev_list);
1008         list_for_each_entry(pos, &thermal_tz_list, node) {
1009                 if (!pos->ops->bind)
1010                         continue;
1011                 result = pos->ops->bind(pos, cdev);
1012                 if (result)
1013                         break;
1014
1015         }
1016         mutex_unlock(&thermal_list_lock);
1017
1018         if (!result)
1019                 return cdev;
1020
1021 unregister:
1022         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1023         device_unregister(&cdev->device);
1024         return ERR_PTR(result);
1025 }
1026 EXPORT_SYMBOL(thermal_cooling_device_register);
1027
1028 /**
1029  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1030  * @cdev:       the thermal cooling device to remove.
1031  *
1032  * thermal_cooling_device_unregister() must be called when the device is no
1033  * longer needed.
1034  */
1035 void thermal_cooling_device_unregister(struct
1036                                        thermal_cooling_device
1037                                        *cdev)
1038 {
1039         struct thermal_zone_device *tz;
1040         struct thermal_cooling_device *pos = NULL;
1041
1042         if (!cdev)
1043                 return;
1044
1045         mutex_lock(&thermal_list_lock);
1046         list_for_each_entry(pos, &thermal_cdev_list, node)
1047             if (pos == cdev)
1048                 break;
1049         if (pos != cdev) {
1050                 /* thermal cooling device not found */
1051                 mutex_unlock(&thermal_list_lock);
1052                 return;
1053         }
1054         list_del(&cdev->node);
1055         list_for_each_entry(tz, &thermal_tz_list, node) {
1056                 if (!tz->ops->unbind)
1057                         continue;
1058                 tz->ops->unbind(tz, cdev);
1059         }
1060         mutex_unlock(&thermal_list_lock);
1061         if (cdev->type[0])
1062                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1063         device_remove_file(&cdev->device, &dev_attr_max_state);
1064         device_remove_file(&cdev->device, &dev_attr_cur_state);
1065
1066         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1067         device_unregister(&cdev->device);
1068         return;
1069 }
1070 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1071
1072 /**
1073  * thermal_zone_device_update - force an update of a thermal zone's state
1074  * @ttz:        the thermal zone to update
1075  */
1076
1077 void thermal_zone_device_update(struct thermal_zone_device *tz)
1078 {
1079         int count, ret = 0;
1080         long temp, trip_temp;
1081         enum thermal_trip_type trip_type;
1082         struct thermal_cooling_device_instance *instance;
1083         struct thermal_cooling_device *cdev;
1084         unsigned long cur_state, max_state;
1085
1086         mutex_lock(&tz->lock);
1087
1088         if (tz->ops->get_temp(tz, &temp)) {
1089                 /* get_temp failed - retry it later */
1090                 pr_warn("failed to read out thermal zone %d\n", tz->id);
1091                 goto leave;
1092         }
1093
1094         for (count = 0; count < tz->trips; count++) {
1095                 tz->ops->get_trip_type(tz, count, &trip_type);
1096                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1097
1098                 switch (trip_type) {
1099                 case THERMAL_TRIP_CRITICAL:
1100                         if (temp >= trip_temp) {
1101                                 if (tz->ops->notify)
1102                                         ret = tz->ops->notify(tz, count,
1103                                                               trip_type);
1104                                 if (!ret) {
1105                                         pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1106                                                  temp/1000);
1107                                         orderly_poweroff(true);
1108                                 }
1109                         }
1110                         break;
1111                 case THERMAL_TRIP_HOT:
1112                         if (temp >= trip_temp)
1113                                 if (tz->ops->notify)
1114                                         tz->ops->notify(tz, count, trip_type);
1115                         break;
1116                 case THERMAL_TRIP_ACTIVE:
1117                         list_for_each_entry(instance, &tz->cooling_devices,
1118                                             node) {
1119                                 if (instance->trip != count)
1120                                         continue;
1121
1122                                 cdev = instance->cdev;
1123
1124                                 cdev->ops->get_cur_state(cdev, &cur_state);
1125                                 cdev->ops->get_max_state(cdev, &max_state);
1126
1127                                 if (temp >= trip_temp)
1128                                         cur_state =
1129                                                 cur_state < instance->upper ?
1130                                                 (cur_state + 1) :
1131                                                 instance->upper;
1132                                 else
1133                                         cur_state =
1134                                                 cur_state > instance->lower ?
1135                                                 (cur_state - 1) :
1136                                                 instance->lower;
1137
1138                                 cdev->ops->set_cur_state(cdev, cur_state);
1139                         }
1140                         break;
1141                 case THERMAL_TRIP_PASSIVE:
1142                         if (temp >= trip_temp || tz->passive)
1143                                 thermal_zone_device_passive(tz, temp,
1144                                                             trip_temp, count);
1145                         break;
1146                 }
1147         }
1148
1149         if (tz->forced_passive)
1150                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1151                                             THERMAL_TRIPS_NONE);
1152
1153         tz->last_temperature = temp;
1154
1155 leave:
1156         if (tz->passive)
1157                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1158         else if (tz->polling_delay)
1159                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1160         else
1161                 thermal_zone_device_set_polling(tz, 0);
1162         mutex_unlock(&tz->lock);
1163 }
1164 EXPORT_SYMBOL(thermal_zone_device_update);
1165
1166 /**
1167  * create_trip_attrs - create attributes for trip points
1168  * @tz:         the thermal zone device
1169  * @mask:       Writeable trip point bitmap.
1170  */
1171 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1172 {
1173         int indx;
1174         int size = sizeof(struct thermal_attr) * tz->trips;
1175
1176         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1177         if (!tz->trip_type_attrs)
1178                 return -ENOMEM;
1179
1180         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1181         if (!tz->trip_temp_attrs) {
1182                 kfree(tz->trip_type_attrs);
1183                 return -ENOMEM;
1184         }
1185
1186         if (tz->ops->get_trip_hyst) {
1187                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1188                 if (!tz->trip_hyst_attrs) {
1189                         kfree(tz->trip_type_attrs);
1190                         kfree(tz->trip_temp_attrs);
1191                         return -ENOMEM;
1192                 }
1193         }
1194
1195
1196         for (indx = 0; indx < tz->trips; indx++) {
1197                 /* create trip type attribute */
1198                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1199                          "trip_point_%d_type", indx);
1200
1201                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1202                 tz->trip_type_attrs[indx].attr.attr.name =
1203                                                 tz->trip_type_attrs[indx].name;
1204                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1205                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1206
1207                 device_create_file(&tz->device,
1208                                    &tz->trip_type_attrs[indx].attr);
1209
1210                 /* create trip temp attribute */
1211                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1212                          "trip_point_%d_temp", indx);
1213
1214                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1215                 tz->trip_temp_attrs[indx].attr.attr.name =
1216                                                 tz->trip_temp_attrs[indx].name;
1217                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1218                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1219                 if (mask & (1 << indx)) {
1220                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1221                         tz->trip_temp_attrs[indx].attr.store =
1222                                                         trip_point_temp_store;
1223                 }
1224
1225                 device_create_file(&tz->device,
1226                                    &tz->trip_temp_attrs[indx].attr);
1227
1228                 /* create Optional trip hyst attribute */
1229                 if (!tz->ops->get_trip_hyst)
1230                         continue;
1231                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1232                          "trip_point_%d_hyst", indx);
1233
1234                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1235                 tz->trip_hyst_attrs[indx].attr.attr.name =
1236                                         tz->trip_hyst_attrs[indx].name;
1237                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1238                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1239                 if (tz->ops->set_trip_hyst) {
1240                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1241                         tz->trip_hyst_attrs[indx].attr.store =
1242                                         trip_point_hyst_store;
1243                 }
1244
1245                 device_create_file(&tz->device,
1246                                    &tz->trip_hyst_attrs[indx].attr);
1247         }
1248         return 0;
1249 }
1250
1251 static void remove_trip_attrs(struct thermal_zone_device *tz)
1252 {
1253         int indx;
1254
1255         for (indx = 0; indx < tz->trips; indx++) {
1256                 device_remove_file(&tz->device,
1257                                    &tz->trip_type_attrs[indx].attr);
1258                 device_remove_file(&tz->device,
1259                                    &tz->trip_temp_attrs[indx].attr);
1260                 if (tz->ops->get_trip_hyst)
1261                         device_remove_file(&tz->device,
1262                                   &tz->trip_hyst_attrs[indx].attr);
1263         }
1264         kfree(tz->trip_type_attrs);
1265         kfree(tz->trip_temp_attrs);
1266         kfree(tz->trip_hyst_attrs);
1267 }
1268
1269 /**
1270  * thermal_zone_device_register - register a new thermal zone device
1271  * @type:       the thermal zone device type
1272  * @trips:      the number of trip points the thermal zone support
1273  * @mask:       a bit string indicating the writeablility of trip points
1274  * @devdata:    private device data
1275  * @ops:        standard thermal zone device callbacks
1276  * @tc1:        thermal coefficient 1 for passive calculations
1277  * @tc2:        thermal coefficient 2 for passive calculations
1278  * @passive_delay: number of milliseconds to wait between polls when
1279  *                 performing passive cooling
1280  * @polling_delay: number of milliseconds to wait between polls when checking
1281  *                 whether trip points have been crossed (0 for interrupt
1282  *                 driven systems)
1283  *
1284  * thermal_zone_device_unregister() must be called when the device is no
1285  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1286  * section 11.1.5.1 of the ACPI specification 3.0.
1287  */
1288 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1289         int trips, int mask, void *devdata,
1290         const struct thermal_zone_device_ops *ops,
1291         int tc1, int tc2, int passive_delay, int polling_delay)
1292 {
1293         struct thermal_zone_device *tz;
1294         struct thermal_cooling_device *pos;
1295         enum thermal_trip_type trip_type;
1296         int result;
1297         int count;
1298         int passive = 0;
1299
1300         if (strlen(type) >= THERMAL_NAME_LENGTH)
1301                 return ERR_PTR(-EINVAL);
1302
1303         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1304                 return ERR_PTR(-EINVAL);
1305
1306         if (!ops || !ops->get_temp)
1307                 return ERR_PTR(-EINVAL);
1308
1309         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1310         if (!tz)
1311                 return ERR_PTR(-ENOMEM);
1312
1313         INIT_LIST_HEAD(&tz->cooling_devices);
1314         idr_init(&tz->idr);
1315         mutex_init(&tz->lock);
1316         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1317         if (result) {
1318                 kfree(tz);
1319                 return ERR_PTR(result);
1320         }
1321
1322         strcpy(tz->type, type);
1323         tz->ops = ops;
1324         tz->device.class = &thermal_class;
1325         tz->devdata = devdata;
1326         tz->trips = trips;
1327         tz->tc1 = tc1;
1328         tz->tc2 = tc2;
1329         tz->passive_delay = passive_delay;
1330         tz->polling_delay = polling_delay;
1331
1332         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1333         result = device_register(&tz->device);
1334         if (result) {
1335                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1336                 kfree(tz);
1337                 return ERR_PTR(result);
1338         }
1339
1340         /* sys I/F */
1341         if (type) {
1342                 result = device_create_file(&tz->device, &dev_attr_type);
1343                 if (result)
1344                         goto unregister;
1345         }
1346
1347         result = device_create_file(&tz->device, &dev_attr_temp);
1348         if (result)
1349                 goto unregister;
1350
1351         if (ops->get_mode) {
1352                 result = device_create_file(&tz->device, &dev_attr_mode);
1353                 if (result)
1354                         goto unregister;
1355         }
1356
1357         result = create_trip_attrs(tz, mask);
1358         if (result)
1359                 goto unregister;
1360
1361         for (count = 0; count < trips; count++) {
1362                 tz->ops->get_trip_type(tz, count, &trip_type);
1363                 if (trip_type == THERMAL_TRIP_PASSIVE)
1364                         passive = 1;
1365         }
1366
1367         if (!passive)
1368                 result = device_create_file(&tz->device,
1369                                             &dev_attr_passive);
1370
1371         if (result)
1372                 goto unregister;
1373
1374         result = thermal_add_hwmon_sysfs(tz);
1375         if (result)
1376                 goto unregister;
1377
1378         mutex_lock(&thermal_list_lock);
1379         list_add_tail(&tz->node, &thermal_tz_list);
1380         if (ops->bind)
1381                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1382                 result = ops->bind(tz, pos);
1383                 if (result)
1384                         break;
1385                 }
1386         mutex_unlock(&thermal_list_lock);
1387
1388         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1389
1390         thermal_zone_device_update(tz);
1391
1392         if (!result)
1393                 return tz;
1394
1395 unregister:
1396         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1397         device_unregister(&tz->device);
1398         return ERR_PTR(result);
1399 }
1400 EXPORT_SYMBOL(thermal_zone_device_register);
1401
1402 /**
1403  * thermal_device_unregister - removes the registered thermal zone device
1404  * @tz: the thermal zone device to remove
1405  */
1406 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1407 {
1408         struct thermal_cooling_device *cdev;
1409         struct thermal_zone_device *pos = NULL;
1410
1411         if (!tz)
1412                 return;
1413
1414         mutex_lock(&thermal_list_lock);
1415         list_for_each_entry(pos, &thermal_tz_list, node)
1416             if (pos == tz)
1417                 break;
1418         if (pos != tz) {
1419                 /* thermal zone device not found */
1420                 mutex_unlock(&thermal_list_lock);
1421                 return;
1422         }
1423         list_del(&tz->node);
1424         if (tz->ops->unbind)
1425                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1426                     tz->ops->unbind(tz, cdev);
1427         mutex_unlock(&thermal_list_lock);
1428
1429         thermal_zone_device_set_polling(tz, 0);
1430
1431         if (tz->type[0])
1432                 device_remove_file(&tz->device, &dev_attr_type);
1433         device_remove_file(&tz->device, &dev_attr_temp);
1434         if (tz->ops->get_mode)
1435                 device_remove_file(&tz->device, &dev_attr_mode);
1436         remove_trip_attrs(tz);
1437
1438         thermal_remove_hwmon_sysfs(tz);
1439         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1440         idr_destroy(&tz->idr);
1441         mutex_destroy(&tz->lock);
1442         device_unregister(&tz->device);
1443         return;
1444 }
1445 EXPORT_SYMBOL(thermal_zone_device_unregister);
1446
1447 #ifdef CONFIG_NET
1448 static struct genl_family thermal_event_genl_family = {
1449         .id = GENL_ID_GENERATE,
1450         .name = THERMAL_GENL_FAMILY_NAME,
1451         .version = THERMAL_GENL_VERSION,
1452         .maxattr = THERMAL_GENL_ATTR_MAX,
1453 };
1454
1455 static struct genl_multicast_group thermal_event_mcgrp = {
1456         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1457 };
1458
1459 int thermal_generate_netlink_event(u32 orig, enum events event)
1460 {
1461         struct sk_buff *skb;
1462         struct nlattr *attr;
1463         struct thermal_genl_event *thermal_event;
1464         void *msg_header;
1465         int size;
1466         int result;
1467         static unsigned int thermal_event_seqnum;
1468
1469         /* allocate memory */
1470         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1471                nla_total_size(0);
1472
1473         skb = genlmsg_new(size, GFP_ATOMIC);
1474         if (!skb)
1475                 return -ENOMEM;
1476
1477         /* add the genetlink message header */
1478         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1479                                  &thermal_event_genl_family, 0,
1480                                  THERMAL_GENL_CMD_EVENT);
1481         if (!msg_header) {
1482                 nlmsg_free(skb);
1483                 return -ENOMEM;
1484         }
1485
1486         /* fill the data */
1487         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1488                            sizeof(struct thermal_genl_event));
1489
1490         if (!attr) {
1491                 nlmsg_free(skb);
1492                 return -EINVAL;
1493         }
1494
1495         thermal_event = nla_data(attr);
1496         if (!thermal_event) {
1497                 nlmsg_free(skb);
1498                 return -EINVAL;
1499         }
1500
1501         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1502
1503         thermal_event->orig = orig;
1504         thermal_event->event = event;
1505
1506         /* send multicast genetlink message */
1507         result = genlmsg_end(skb, msg_header);
1508         if (result < 0) {
1509                 nlmsg_free(skb);
1510                 return result;
1511         }
1512
1513         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1514         if (result)
1515                 pr_info("failed to send netlink event:%d\n", result);
1516
1517         return result;
1518 }
1519 EXPORT_SYMBOL(thermal_generate_netlink_event);
1520
1521 static int genetlink_init(void)
1522 {
1523         int result;
1524
1525         result = genl_register_family(&thermal_event_genl_family);
1526         if (result)
1527                 return result;
1528
1529         result = genl_register_mc_group(&thermal_event_genl_family,
1530                                         &thermal_event_mcgrp);
1531         if (result)
1532                 genl_unregister_family(&thermal_event_genl_family);
1533         return result;
1534 }
1535
1536 static void genetlink_exit(void)
1537 {
1538         genl_unregister_family(&thermal_event_genl_family);
1539 }
1540 #else /* !CONFIG_NET */
1541 static inline int genetlink_init(void) { return 0; }
1542 static inline void genetlink_exit(void) {}
1543 #endif /* !CONFIG_NET */
1544
1545 static int __init thermal_init(void)
1546 {
1547         int result = 0;
1548
1549         result = class_register(&thermal_class);
1550         if (result) {
1551                 idr_destroy(&thermal_tz_idr);
1552                 idr_destroy(&thermal_cdev_idr);
1553                 mutex_destroy(&thermal_idr_lock);
1554                 mutex_destroy(&thermal_list_lock);
1555         }
1556         result = genetlink_init();
1557         return result;
1558 }
1559
1560 static void __exit thermal_exit(void)
1561 {
1562         class_unregister(&thermal_class);
1563         idr_destroy(&thermal_tz_idr);
1564         idr_destroy(&thermal_cdev_idr);
1565         mutex_destroy(&thermal_idr_lock);
1566         mutex_destroy(&thermal_list_lock);
1567         genetlink_exit();
1568 }
1569
1570 fs_initcall(thermal_init);
1571 module_exit(thermal_exit);