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 #define THERMAL_NO_TARGET -1UL
  45 /*
  46  * This structure is used to describe the behavior of
  47  * a certain cooling device on a certain trip point
  48  * in a certain thermal zone
  49  */
  50 struct thermal_instance {
  51         int id;
  52         char name[THERMAL_NAME_LENGTH];
  53         struct thermal_zone_device *tz;
  54         struct thermal_cooling_device *cdev;
  55         int trip;
  56         unsigned long upper;    /* Highest cooling state for this trip point */
  57         unsigned long lower;    /* Lowest cooling state for this trip point */
  58         unsigned long target;   /* expected cooling state */
  59         char attr_name[THERMAL_NAME_LENGTH];
  60         struct device_attribute attr;
  61         struct list_head tz_node; /* node in tz->thermal_instances */
  62         struct list_head cdev_node; /* node in cdev->thermal_instances */
  63 };
  64
  65 static DEFINE_IDR(thermal_tz_idr);
  66 static DEFINE_IDR(thermal_cdev_idr);
  67 static DEFINE_MUTEX(thermal_idr_lock);
  68
  69 static LIST_HEAD(thermal_tz_list);
  70 static LIST_HEAD(thermal_cdev_list);
  71 static DEFINE_MUTEX(thermal_list_lock);
  72
  73 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  74 {
  75         int err;
  76
  77 again:
  78         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  79                 return -ENOMEM;
  80
  81         if (lock)
  82                 mutex_lock(lock);
  83         err = idr_get_new(idr, NULL, id);
  84         if (lock)
  85                 mutex_unlock(lock);
  86         if (unlikely(err == -EAGAIN))
  87                 goto again;
  88         else if (unlikely(err))
  89                 return err;
  90
  91         *id = *id & MAX_ID_MASK;
  92         return 0;
  93 }
  94
  95 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  96 {
  97         if (lock)
  98                 mutex_lock(lock);
  99         idr_remove(idr, id);
 100         if (lock)
 101                 mutex_unlock(lock);
 102 }
 103
 104 /* sys I/F for thermal zone */
 105
 106 #define to_thermal_zone(_dev) \
 107         container_of(_dev, struct thermal_zone_device, device)
 108
 109 static ssize_t
 110 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 111 {
 112         struct thermal_zone_device *tz = to_thermal_zone(dev);
 113
 114         return sprintf(buf, "%s\n", tz->type);
 115 }
 116
 117 static ssize_t
 118 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 119 {
 120         struct thermal_zone_device *tz = to_thermal_zone(dev);
 121         long temperature;
 122         int ret;
 123
 124         if (!tz->ops->get_temp)
 125                 return -EPERM;
 126
 127         ret = tz->ops->get_temp(tz, &temperature);
 128
 129         if (ret)
 130                 return ret;
 131
 132         return sprintf(buf, "%ld\n", temperature);
 133 }
 134
 135 static ssize_t
 136 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 137 {
 138         struct thermal_zone_device *tz = to_thermal_zone(dev);
 139         enum thermal_device_mode mode;
 140         int result;
 141
 142         if (!tz->ops->get_mode)
 143                 return -EPERM;
 144
 145         result = tz->ops->get_mode(tz, &mode);
 146         if (result)
 147                 return result;
 148
 149         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 150                        : "disabled");
 151 }
 152
 153 static ssize_t
 154 mode_store(struct device *dev, struct device_attribute *attr,
 155            const char *buf, size_t count)
 156 {
 157         struct thermal_zone_device *tz = to_thermal_zone(dev);
 158         int result;
 159
 160         if (!tz->ops->set_mode)
 161                 return -EPERM;
 162
 163         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 164                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 165         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 166                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 167         else
 168                 result = -EINVAL;
 169
 170         if (result)
 171                 return result;
 172
 173         return count;
 174 }
 175
 176 static ssize_t
 177 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 178                      char *buf)
 179 {
 180         struct thermal_zone_device *tz = to_thermal_zone(dev);
 181         enum thermal_trip_type type;
 182         int trip, result;
 183
 184         if (!tz->ops->get_trip_type)
 185                 return -EPERM;
 186
 187         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 188                 return -EINVAL;
 189
 190         result = tz->ops->get_trip_type(tz, trip, &type);
 191         if (result)
 192                 return result;
 193
 194         switch (type) {
 195         case THERMAL_TRIP_CRITICAL:
 196                 return sprintf(buf, "critical\n");
 197         case THERMAL_TRIP_HOT:
 198                 return sprintf(buf, "hot\n");
 199         case THERMAL_TRIP_PASSIVE:
 200                 return sprintf(buf, "passive\n");
 201         case THERMAL_TRIP_ACTIVE:
 202                 return sprintf(buf, "active\n");
 203         default:
 204                 return sprintf(buf, "unknown\n");
 205         }
 206 }
 207
 208 static ssize_t
 209 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 210                      const char *buf, size_t count)
 211 {
 212         struct thermal_zone_device *tz = to_thermal_zone(dev);
 213         int trip, ret;
 214         unsigned long temperature;
 215
 216         if (!tz->ops->set_trip_temp)
 217                 return -EPERM;
 218
 219         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 220                 return -EINVAL;
 221
 222         if (kstrtoul(buf, 10, &temperature))
 223                 return -EINVAL;
 224
 225         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 226
 227         return ret ? ret : count;
 228 }
 229
 230 static ssize_t
 231 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 232                      char *buf)
 233 {
 234         struct thermal_zone_device *tz = to_thermal_zone(dev);
 235         int trip, ret;
 236         long temperature;
 237
 238         if (!tz->ops->get_trip_temp)
 239                 return -EPERM;
 240
 241         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 242                 return -EINVAL;
 243
 244         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 245
 246         if (ret)
 247                 return ret;
 248
 249         return sprintf(buf, "%ld\n", temperature);
 250 }
 251
 252 static ssize_t
 253 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 254                         const char *buf, size_t count)
 255 {
 256         struct thermal_zone_device *tz = to_thermal_zone(dev);
 257         int trip, ret;
 258         unsigned long temperature;
 259
 260         if (!tz->ops->set_trip_hyst)
 261                 return -EPERM;
 262
 263         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 264                 return -EINVAL;
 265
 266         if (kstrtoul(buf, 10, &temperature))
 267                 return -EINVAL;
 268
 269         /*
 270          * We are not doing any check on the 'temperature' value
 271          * here. The driver implementing 'set_trip_hyst' has to
 272          * take care of this.
 273          */
 274         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 275
 276         return ret ? ret : count;
 277 }
 278
 279 static ssize_t
 280 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 281                         char *buf)
 282 {
 283         struct thermal_zone_device *tz = to_thermal_zone(dev);
 284         int trip, ret;
 285         unsigned long temperature;
 286
 287         if (!tz->ops->get_trip_hyst)
 288                 return -EPERM;
 289
 290         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 291                 return -EINVAL;
 292
 293         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 294
 295         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 296 }
 297
 298 static ssize_t
 299 passive_store(struct device *dev, struct device_attribute *attr,
 300                     const char *buf, size_t count)
 301 {
 302         struct thermal_zone_device *tz = to_thermal_zone(dev);
 303         struct thermal_cooling_device *cdev = NULL;
 304         int state;
 305
 306         if (!sscanf(buf, "%d\n", &state))
 307                 return -EINVAL;
 308
 309         /* sanity check: values below 1000 millicelcius don't make sense
 310          * and can cause the system to go into a thermal heart attack
 311          */
 312         if (state && state < 1000)
 313                 return -EINVAL;
 314
 315         if (state && !tz->forced_passive) {
 316                 mutex_lock(&thermal_list_lock);
 317                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 318                         if (!strncmp("Processor", cdev->type,
 319                                      sizeof("Processor")))
 320                                 thermal_zone_bind_cooling_device(tz,
 321                                                 THERMAL_TRIPS_NONE, cdev,
 322                                                 THERMAL_NO_LIMIT,
 323                                                 THERMAL_NO_LIMIT);
 324                 }
 325                 mutex_unlock(&thermal_list_lock);
 326                 if (!tz->passive_delay)
 327                         tz->passive_delay = 1000;
 328         } else if (!state && tz->forced_passive) {
 329                 mutex_lock(&thermal_list_lock);
 330                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 331                         if (!strncmp("Processor", cdev->type,
 332                                      sizeof("Processor")))
 333                                 thermal_zone_unbind_cooling_device(tz,
 334                                                                    THERMAL_TRIPS_NONE,
 335                                                                    cdev);
 336                 }
 337                 mutex_unlock(&thermal_list_lock);
 338                 tz->passive_delay = 0;
 339         }
 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_instance *instance;
 437
 438         instance =
 439             container_of(attr, struct thermal_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_check(struct work_struct *work)
 719 {
 720         struct thermal_zone_device *tz = container_of(work, struct
 721                                                       thermal_zone_device,
 722                                                       poll_queue.work);
 723         thermal_zone_device_update(tz);
 724 }
 725
 726 /**
 727  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 728  * @tz:         thermal zone device
 729  * @trip:       indicates which trip point the cooling devices is
 730  *              associated with in this thermal zone.
 731  * @cdev:       thermal cooling device
 732  *
 733  * This function is usually called in the thermal zone device .bind callback.
 734  */
 735 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 736                                      int trip,
 737                                      struct thermal_cooling_device *cdev,
 738                                      unsigned long upper, unsigned long lower)
 739 {
 740         struct thermal_instance *dev;
 741         struct thermal_instance *pos;
 742         struct thermal_zone_device *pos1;
 743         struct thermal_cooling_device *pos2;
 744         unsigned long max_state;
 745         int result;
 746
 747         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 748                 return -EINVAL;
 749
 750         list_for_each_entry(pos1, &thermal_tz_list, node) {
 751                 if (pos1 == tz)
 752                         break;
 753         }
 754         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 755                 if (pos2 == cdev)
 756                         break;
 757         }
 758
 759         if (tz != pos1 || cdev != pos2)
 760                 return -EINVAL;
 761
 762         cdev->ops->get_max_state(cdev, &max_state);
 763
 764         /* lower default 0, upper default max_state */
 765         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 766         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 767
 768         if (lower > upper || upper > max_state)
 769                 return -EINVAL;
 770
 771         dev =
 772             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 773         if (!dev)
 774                 return -ENOMEM;
 775         dev->tz = tz;
 776         dev->cdev = cdev;
 777         dev->trip = trip;
 778         dev->upper = upper;
 779         dev->lower = lower;
 780         dev->target = THERMAL_NO_TARGET;
 781
 782         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 783         if (result)
 784                 goto free_mem;
 785
 786         sprintf(dev->name, "cdev%d", dev->id);
 787         result =
 788             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 789         if (result)
 790                 goto release_idr;
 791
 792         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 793         sysfs_attr_init(&dev->attr.attr);
 794         dev->attr.attr.name = dev->attr_name;
 795         dev->attr.attr.mode = 0444;
 796         dev->attr.show = thermal_cooling_device_trip_point_show;
 797         result = device_create_file(&tz->device, &dev->attr);
 798         if (result)
 799                 goto remove_symbol_link;
 800
 801         mutex_lock(&tz->lock);
 802         mutex_lock(&cdev->lock);
 803         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 804             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 805                 result = -EEXIST;
 806                 break;
 807         }
 808         if (!result) {
 809                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 810                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 811         }
 812         mutex_unlock(&cdev->lock);
 813         mutex_unlock(&tz->lock);
 814
 815         if (!result)
 816                 return 0;
 817
 818         device_remove_file(&tz->device, &dev->attr);
 819 remove_symbol_link:
 820         sysfs_remove_link(&tz->device.kobj, dev->name);
 821 release_idr:
 822         release_idr(&tz->idr, &tz->lock, dev->id);
 823 free_mem:
 824         kfree(dev);
 825         return result;
 826 }
 827 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 828
 829 /**
 830  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 831  * @tz:         thermal zone device
 832  * @trip:       indicates which trip point the cooling devices is
 833  *              associated with in this thermal zone.
 834  * @cdev:       thermal cooling device
 835  *
 836  * This function is usually called in the thermal zone device .unbind callback.
 837  */
 838 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 839                                        int trip,
 840                                        struct thermal_cooling_device *cdev)
 841 {
 842         struct thermal_instance *pos, *next;
 843
 844         mutex_lock(&tz->lock);
 845         mutex_lock(&cdev->lock);
 846         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 847                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 848                         list_del(&pos->tz_node);
 849                         list_del(&pos->cdev_node);
 850                         mutex_unlock(&cdev->lock);
 851                         mutex_unlock(&tz->lock);
 852                         goto unbind;
 853                 }
 854         }
 855         mutex_unlock(&cdev->lock);
 856         mutex_unlock(&tz->lock);
 857
 858         return -ENODEV;
 859
 860 unbind:
 861         device_remove_file(&tz->device, &pos->attr);
 862         sysfs_remove_link(&tz->device.kobj, pos->name);
 863         release_idr(&tz->idr, &tz->lock, pos->id);
 864         kfree(pos);
 865         return 0;
 866 }
 867 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 868
 869 static void thermal_release(struct device *dev)
 870 {
 871         struct thermal_zone_device *tz;
 872         struct thermal_cooling_device *cdev;
 873
 874         if (!strncmp(dev_name(dev), "thermal_zone",
 875                      sizeof("thermal_zone") - 1)) {
 876                 tz = to_thermal_zone(dev);
 877                 kfree(tz);
 878         } else {
 879                 cdev = to_cooling_device(dev);
 880                 kfree(cdev);
 881         }
 882 }
 883
 884 static struct class thermal_class = {
 885         .name = "thermal",
 886         .dev_release = thermal_release,
 887 };
 888
 889 /**
 890  * thermal_cooling_device_register - register a new thermal cooling device
 891  * @type:       the thermal cooling device type.
 892  * @devdata:    device private data.
 893  * @ops:                standard thermal cooling devices callbacks.
 894  */
 895 struct thermal_cooling_device *
 896 thermal_cooling_device_register(char *type, void *devdata,
 897                                 const struct thermal_cooling_device_ops *ops)
 898 {
 899         struct thermal_cooling_device *cdev;
 900         struct thermal_zone_device *pos;
 901         int result;
 902
 903         if (strlen(type) >= THERMAL_NAME_LENGTH)
 904                 return ERR_PTR(-EINVAL);
 905
 906         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 907             !ops->set_cur_state)
 908                 return ERR_PTR(-EINVAL);
 909
 910         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 911         if (!cdev)
 912                 return ERR_PTR(-ENOMEM);
 913
 914         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 915         if (result) {
 916                 kfree(cdev);
 917                 return ERR_PTR(result);
 918         }
 919
 920         strcpy(cdev->type, type);
 921         mutex_init(&cdev->lock);
 922         INIT_LIST_HEAD(&cdev->thermal_instances);
 923         cdev->ops = ops;
 924         cdev->updated = true;
 925         cdev->device.class = &thermal_class;
 926         cdev->devdata = devdata;
 927         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 928         result = device_register(&cdev->device);
 929         if (result) {
 930                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 931                 kfree(cdev);
 932                 return ERR_PTR(result);
 933         }
 934
 935         /* sys I/F */
 936         if (type) {
 937                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 938                 if (result)
 939                         goto unregister;
 940         }
 941
 942         result = device_create_file(&cdev->device, &dev_attr_max_state);
 943         if (result)
 944                 goto unregister;
 945
 946         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 947         if (result)
 948                 goto unregister;
 949
 950         mutex_lock(&thermal_list_lock);
 951         list_add(&cdev->node, &thermal_cdev_list);
 952         list_for_each_entry(pos, &thermal_tz_list, node) {
 953                 if (!pos->ops->bind)
 954                         continue;
 955                 result = pos->ops->bind(pos, cdev);
 956                 if (result)
 957                         break;
 958
 959         }
 960         mutex_unlock(&thermal_list_lock);
 961
 962         if (!result)
 963                 return cdev;
 964
 965 unregister:
 966         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 967         device_unregister(&cdev->device);
 968         return ERR_PTR(result);
 969 }
 970 EXPORT_SYMBOL(thermal_cooling_device_register);
 971
 972 /**
 973  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 974  * @cdev:       the thermal cooling device to remove.
 975  *
 976  * thermal_cooling_device_unregister() must be called when the device is no
 977  * longer needed.
 978  */
 979 void thermal_cooling_device_unregister(struct
 980                                        thermal_cooling_device
 981                                        *cdev)
 982 {
 983         struct thermal_zone_device *tz;
 984         struct thermal_cooling_device *pos = NULL;
 985
 986         if (!cdev)
 987                 return;
 988
 989         mutex_lock(&thermal_list_lock);
 990         list_for_each_entry(pos, &thermal_cdev_list, node)
 991             if (pos == cdev)
 992                 break;
 993         if (pos != cdev) {
 994                 /* thermal cooling device not found */
 995                 mutex_unlock(&thermal_list_lock);
 996                 return;
 997         }
 998         list_del(&cdev->node);
 999         list_for_each_entry(tz, &thermal_tz_list, node) {
1000                 if (!tz->ops->unbind)
1001                         continue;
1002                 tz->ops->unbind(tz, cdev);
1003         }
1004         mutex_unlock(&thermal_list_lock);
1005         if (cdev->type[0])
1006                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1007         device_remove_file(&cdev->device, &dev_attr_max_state);
1008         device_remove_file(&cdev->device, &dev_attr_cur_state);
1009
1010         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1011         device_unregister(&cdev->device);
1012         return;
1013 }
1014 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1015
1016 static void thermal_cdev_do_update(struct thermal_cooling_device *cdev)
1017 {
1018         struct thermal_instance *instance;
1019         unsigned long target = 0;
1020
1021         /* cooling device is updated*/
1022         if (cdev->updated)
1023                 return;
1024
1025         mutex_lock(&cdev->lock);
1026         /* Make sure cdev enters the deepest cooling state */
1027         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1028                 if (instance->target == THERMAL_NO_TARGET)
1029                         continue;
1030                 if (instance->target > target)
1031                         target = instance->target;
1032         }
1033         mutex_unlock(&cdev->lock);
1034         cdev->ops->set_cur_state(cdev, target);
1035         cdev->updated = true;
1036 }
1037
1038 static void thermal_zone_do_update(struct thermal_zone_device *tz)
1039 {
1040         struct thermal_instance *instance;
1041
1042         list_for_each_entry(instance, &tz->thermal_instances, tz_node)
1043                 thermal_cdev_do_update(instance->cdev);
1044 }
1045
1046 /*
1047  * Cooling algorithm for both active and passive cooling
1048  *
1049  * 1. if the temperature is higher than a trip point,
1050  *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
1051  *       state for this trip point
1052  *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
1053  *       state for this trip point
1054  *
1055  * 2. if the temperature is lower than a trip point, use lower
1056  *    cooling state for this trip point
1057  *
1058  * Note that this behaves the same as the previous passive cooling
1059  * algorithm.
1060  */
1061
1062 static void thermal_zone_trip_update(struct thermal_zone_device *tz,
1063                                      int trip, long temp)
1064 {
1065         struct thermal_instance *instance;
1066         struct thermal_cooling_device *cdev = NULL;
1067         unsigned long cur_state, max_state;
1068         long trip_temp;
1069         enum thermal_trip_type trip_type;
1070         enum thermal_trend trend;
1071
1072         if (trip == THERMAL_TRIPS_NONE) {
1073                 trip_temp = tz->forced_passive;
1074                 trip_type = THERMAL_TRIPS_NONE;
1075         } else {
1076                 tz->ops->get_trip_temp(tz, trip, &trip_temp);
1077                 tz->ops->get_trip_type(tz, trip, &trip_type);
1078         }
1079
1080         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
1081                 /*
1082                  * compare the current temperature and previous temperature
1083                  * to get the thermal trend, if no special requirement
1084                  */
1085                 if (tz->temperature > tz->last_temperature)
1086                         trend = THERMAL_TREND_RAISING;
1087                 else if (tz->temperature < tz->last_temperature)
1088                         trend = THERMAL_TREND_DROPPING;
1089                 else
1090                         trend = THERMAL_TREND_STABLE;
1091         }
1092
1093         if (temp >= trip_temp) {
1094                 list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1095                         if (instance->trip != trip)
1096                                 continue;
1097
1098                         cdev = instance->cdev;
1099
1100                         cdev->ops->get_cur_state(cdev, &cur_state);
1101                         cdev->ops->get_max_state(cdev, &max_state);
1102
1103                         if (trend == THERMAL_TREND_RAISING) {
1104                                 cur_state = cur_state < instance->upper ?
1105                                             (cur_state + 1) : instance->upper;
1106                         } else if (trend == THERMAL_TREND_DROPPING) {
1107                                 cur_state = cur_state > instance->lower ?
1108                                     (cur_state - 1) : instance->lower;
1109                         }
1110
1111                         /* activate a passive thermal instance */
1112                         if ((trip_type == THERMAL_TRIP_PASSIVE ||
1113                              trip_type == THERMAL_TRIPS_NONE) &&
1114                              instance->target == THERMAL_NO_TARGET)
1115                                 tz->passive++;
1116
1117                         instance->target = cur_state;
1118                         cdev->updated = false; /* cooling device needs update */
1119                 }
1120         } else {        /* below trip */
1121                 list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1122                         if (instance->trip != trip)
1123                                 continue;
1124
1125                         /* Do not use the inactive thermal instance */
1126                         if (instance->target == THERMAL_NO_TARGET)
1127                                 continue;
1128                         cdev = instance->cdev;
1129                         cdev->ops->get_cur_state(cdev, &cur_state);
1130
1131                         cur_state = cur_state > instance->lower ?
1132                                     (cur_state - 1) : THERMAL_NO_TARGET;
1133
1134                         /* deactivate a passive thermal instance */
1135                         if ((trip_type == THERMAL_TRIP_PASSIVE ||
1136                              trip_type == THERMAL_TRIPS_NONE) &&
1137                              cur_state == THERMAL_NO_TARGET)
1138                                 tz->passive--;
1139                         instance->target = cur_state;
1140                         cdev->updated = false; /* cooling device needs update */
1141                 }
1142         }
1143
1144         return;
1145 }
1146 /**
1147  * thermal_zone_device_update - force an update of a thermal zone's state
1148  * @ttz:        the thermal zone to update
1149  */
1150
1151 void thermal_zone_device_update(struct thermal_zone_device *tz)
1152 {
1153         int count, ret = 0;
1154         long temp, trip_temp;
1155         enum thermal_trip_type trip_type;
1156
1157         mutex_lock(&tz->lock);
1158
1159         if (tz->ops->get_temp(tz, &temp)) {
1160                 /* get_temp failed - retry it later */
1161                 pr_warn("failed to read out thermal zone %d\n", tz->id);
1162                 goto leave;
1163         }
1164
1165         tz->last_temperature = tz->temperature;
1166         tz->temperature = temp;
1167
1168         for (count = 0; count < tz->trips; count++) {
1169                 tz->ops->get_trip_type(tz, count, &trip_type);
1170                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1171
1172                 switch (trip_type) {
1173                 case THERMAL_TRIP_CRITICAL:
1174                         if (temp >= trip_temp) {
1175                                 if (tz->ops->notify)
1176                                         ret = tz->ops->notify(tz, count,
1177                                                               trip_type);
1178                                 if (!ret) {
1179                                         pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1180                                                  temp/1000);
1181                                         orderly_poweroff(true);
1182                                 }
1183                         }
1184                         break;
1185                 case THERMAL_TRIP_HOT:
1186                         if (temp >= trip_temp)
1187                                 if (tz->ops->notify)
1188                                         tz->ops->notify(tz, count, trip_type);
1189                         break;
1190                 case THERMAL_TRIP_ACTIVE:
1191                         thermal_zone_trip_update(tz, count, temp);
1192                         break;
1193                 case THERMAL_TRIP_PASSIVE:
1194                         if (temp >= trip_temp || tz->passive)
1195                                 thermal_zone_trip_update(tz, count, temp);
1196                         break;
1197                 }
1198         }
1199
1200         if (tz->forced_passive)
1201                 thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
1202         thermal_zone_do_update(tz);
1203
1204 leave:
1205         if (tz->passive)
1206                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1207         else if (tz->polling_delay)
1208                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1209         else
1210                 thermal_zone_device_set_polling(tz, 0);
1211         mutex_unlock(&tz->lock);
1212 }
1213 EXPORT_SYMBOL(thermal_zone_device_update);
1214
1215 /**
1216  * create_trip_attrs - create attributes for trip points
1217  * @tz:         the thermal zone device
1218  * @mask:       Writeable trip point bitmap.
1219  */
1220 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1221 {
1222         int indx;
1223         int size = sizeof(struct thermal_attr) * tz->trips;
1224
1225         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1226         if (!tz->trip_type_attrs)
1227                 return -ENOMEM;
1228
1229         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1230         if (!tz->trip_temp_attrs) {
1231                 kfree(tz->trip_type_attrs);
1232                 return -ENOMEM;
1233         }
1234
1235         if (tz->ops->get_trip_hyst) {
1236                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1237                 if (!tz->trip_hyst_attrs) {
1238                         kfree(tz->trip_type_attrs);
1239                         kfree(tz->trip_temp_attrs);
1240                         return -ENOMEM;
1241                 }
1242         }
1243
1244
1245         for (indx = 0; indx < tz->trips; indx++) {
1246                 /* create trip type attribute */
1247                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1248                          "trip_point_%d_type", indx);
1249
1250                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1251                 tz->trip_type_attrs[indx].attr.attr.name =
1252                                                 tz->trip_type_attrs[indx].name;
1253                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1254                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1255
1256                 device_create_file(&tz->device,
1257                                    &tz->trip_type_attrs[indx].attr);
1258
1259                 /* create trip temp attribute */
1260                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1261                          "trip_point_%d_temp", indx);
1262
1263                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1264                 tz->trip_temp_attrs[indx].attr.attr.name =
1265                                                 tz->trip_temp_attrs[indx].name;
1266                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1267                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1268                 if (mask & (1 << indx)) {
1269                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1270                         tz->trip_temp_attrs[indx].attr.store =
1271                                                         trip_point_temp_store;
1272                 }
1273
1274                 device_create_file(&tz->device,
1275                                    &tz->trip_temp_attrs[indx].attr);
1276
1277                 /* create Optional trip hyst attribute */
1278                 if (!tz->ops->get_trip_hyst)
1279                         continue;
1280                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1281                          "trip_point_%d_hyst", indx);
1282
1283                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1284                 tz->trip_hyst_attrs[indx].attr.attr.name =
1285                                         tz->trip_hyst_attrs[indx].name;
1286                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1287                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1288                 if (tz->ops->set_trip_hyst) {
1289                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1290                         tz->trip_hyst_attrs[indx].attr.store =
1291                                         trip_point_hyst_store;
1292                 }
1293
1294                 device_create_file(&tz->device,
1295                                    &tz->trip_hyst_attrs[indx].attr);
1296         }
1297         return 0;
1298 }
1299
1300 static void remove_trip_attrs(struct thermal_zone_device *tz)
1301 {
1302         int indx;
1303
1304         for (indx = 0; indx < tz->trips; indx++) {
1305                 device_remove_file(&tz->device,
1306                                    &tz->trip_type_attrs[indx].attr);
1307                 device_remove_file(&tz->device,
1308                                    &tz->trip_temp_attrs[indx].attr);
1309                 if (tz->ops->get_trip_hyst)
1310                         device_remove_file(&tz->device,
1311                                   &tz->trip_hyst_attrs[indx].attr);
1312         }
1313         kfree(tz->trip_type_attrs);
1314         kfree(tz->trip_temp_attrs);
1315         kfree(tz->trip_hyst_attrs);
1316 }
1317
1318 /**
1319  * thermal_zone_device_register - register a new thermal zone device
1320  * @type:       the thermal zone device type
1321  * @trips:      the number of trip points the thermal zone support
1322  * @mask:       a bit string indicating the writeablility of trip points
1323  * @devdata:    private device data
1324  * @ops:        standard thermal zone device callbacks
1325  * @passive_delay: number of milliseconds to wait between polls when
1326  *                 performing passive cooling
1327  * @polling_delay: number of milliseconds to wait between polls when checking
1328  *                 whether trip points have been crossed (0 for interrupt
1329  *                 driven systems)
1330  *
1331  * thermal_zone_device_unregister() must be called when the device is no
1332  * longer needed. The passive cooling depends on the .get_trend() return value.
1333  */
1334 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1335         int trips, int mask, void *devdata,
1336         const struct thermal_zone_device_ops *ops,
1337         int passive_delay, int polling_delay)
1338 {
1339         struct thermal_zone_device *tz;
1340         struct thermal_cooling_device *pos;
1341         enum thermal_trip_type trip_type;
1342         int result;
1343         int count;
1344         int passive = 0;
1345
1346         if (strlen(type) >= THERMAL_NAME_LENGTH)
1347                 return ERR_PTR(-EINVAL);
1348
1349         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1350                 return ERR_PTR(-EINVAL);
1351
1352         if (!ops || !ops->get_temp)
1353                 return ERR_PTR(-EINVAL);
1354
1355         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1356         if (!tz)
1357                 return ERR_PTR(-ENOMEM);
1358
1359         INIT_LIST_HEAD(&tz->thermal_instances);
1360         idr_init(&tz->idr);
1361         mutex_init(&tz->lock);
1362         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1363         if (result) {
1364                 kfree(tz);
1365                 return ERR_PTR(result);
1366         }
1367
1368         strcpy(tz->type, type);
1369         tz->ops = ops;
1370         tz->device.class = &thermal_class;
1371         tz->devdata = devdata;
1372         tz->trips = trips;
1373         tz->passive_delay = passive_delay;
1374         tz->polling_delay = polling_delay;
1375
1376         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1377         result = device_register(&tz->device);
1378         if (result) {
1379                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1380                 kfree(tz);
1381                 return ERR_PTR(result);
1382         }
1383
1384         /* sys I/F */
1385         if (type) {
1386                 result = device_create_file(&tz->device, &dev_attr_type);
1387                 if (result)
1388                         goto unregister;
1389         }
1390
1391         result = device_create_file(&tz->device, &dev_attr_temp);
1392         if (result)
1393                 goto unregister;
1394
1395         if (ops->get_mode) {
1396                 result = device_create_file(&tz->device, &dev_attr_mode);
1397                 if (result)
1398                         goto unregister;
1399         }
1400
1401         result = create_trip_attrs(tz, mask);
1402         if (result)
1403                 goto unregister;
1404
1405         for (count = 0; count < trips; count++) {
1406                 tz->ops->get_trip_type(tz, count, &trip_type);
1407                 if (trip_type == THERMAL_TRIP_PASSIVE)
1408                         passive = 1;
1409         }
1410
1411         if (!passive)
1412                 result = device_create_file(&tz->device,
1413                                             &dev_attr_passive);
1414
1415         if (result)
1416                 goto unregister;
1417
1418         result = thermal_add_hwmon_sysfs(tz);
1419         if (result)
1420                 goto unregister;
1421
1422         mutex_lock(&thermal_list_lock);
1423         list_add_tail(&tz->node, &thermal_tz_list);
1424         if (ops->bind)
1425                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1426                 result = ops->bind(tz, pos);
1427                 if (result)
1428                         break;
1429                 }
1430         mutex_unlock(&thermal_list_lock);
1431
1432         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1433
1434         thermal_zone_device_update(tz);
1435
1436         if (!result)
1437                 return tz;
1438
1439 unregister:
1440         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1441         device_unregister(&tz->device);
1442         return ERR_PTR(result);
1443 }
1444 EXPORT_SYMBOL(thermal_zone_device_register);
1445
1446 /**
1447  * thermal_device_unregister - removes the registered thermal zone device
1448  * @tz: the thermal zone device to remove
1449  */
1450 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1451 {
1452         struct thermal_cooling_device *cdev;
1453         struct thermal_zone_device *pos = NULL;
1454
1455         if (!tz)
1456                 return;
1457
1458         mutex_lock(&thermal_list_lock);
1459         list_for_each_entry(pos, &thermal_tz_list, node)
1460             if (pos == tz)
1461                 break;
1462         if (pos != tz) {
1463                 /* thermal zone device not found */
1464                 mutex_unlock(&thermal_list_lock);
1465                 return;
1466         }
1467         list_del(&tz->node);
1468         if (tz->ops->unbind)
1469                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1470                     tz->ops->unbind(tz, cdev);
1471         mutex_unlock(&thermal_list_lock);
1472
1473         thermal_zone_device_set_polling(tz, 0);
1474
1475         if (tz->type[0])
1476                 device_remove_file(&tz->device, &dev_attr_type);
1477         device_remove_file(&tz->device, &dev_attr_temp);
1478         if (tz->ops->get_mode)
1479                 device_remove_file(&tz->device, &dev_attr_mode);
1480         remove_trip_attrs(tz);
1481
1482         thermal_remove_hwmon_sysfs(tz);
1483         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1484         idr_destroy(&tz->idr);
1485         mutex_destroy(&tz->lock);
1486         device_unregister(&tz->device);
1487         return;
1488 }
1489 EXPORT_SYMBOL(thermal_zone_device_unregister);
1490
1491 #ifdef CONFIG_NET
1492 static struct genl_family thermal_event_genl_family = {
1493         .id = GENL_ID_GENERATE,
1494         .name = THERMAL_GENL_FAMILY_NAME,
1495         .version = THERMAL_GENL_VERSION,
1496         .maxattr = THERMAL_GENL_ATTR_MAX,
1497 };
1498
1499 static struct genl_multicast_group thermal_event_mcgrp = {
1500         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1501 };
1502
1503 int thermal_generate_netlink_event(u32 orig, enum events event)
1504 {
1505         struct sk_buff *skb;
1506         struct nlattr *attr;
1507         struct thermal_genl_event *thermal_event;
1508         void *msg_header;
1509         int size;
1510         int result;
1511         static unsigned int thermal_event_seqnum;
1512
1513         /* allocate memory */
1514         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1515                nla_total_size(0);
1516
1517         skb = genlmsg_new(size, GFP_ATOMIC);
1518         if (!skb)
1519                 return -ENOMEM;
1520
1521         /* add the genetlink message header */
1522         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1523                                  &thermal_event_genl_family, 0,
1524                                  THERMAL_GENL_CMD_EVENT);
1525         if (!msg_header) {
1526                 nlmsg_free(skb);
1527                 return -ENOMEM;
1528         }
1529
1530         /* fill the data */
1531         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1532                            sizeof(struct thermal_genl_event));
1533
1534         if (!attr) {
1535                 nlmsg_free(skb);
1536                 return -EINVAL;
1537         }
1538
1539         thermal_event = nla_data(attr);
1540         if (!thermal_event) {
1541                 nlmsg_free(skb);
1542                 return -EINVAL;
1543         }
1544
1545         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1546
1547         thermal_event->orig = orig;
1548         thermal_event->event = event;
1549
1550         /* send multicast genetlink message */
1551         result = genlmsg_end(skb, msg_header);
1552         if (result < 0) {
1553                 nlmsg_free(skb);
1554                 return result;
1555         }
1556
1557         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1558         if (result)
1559                 pr_info("failed to send netlink event:%d\n", result);
1560
1561         return result;
1562 }
1563 EXPORT_SYMBOL(thermal_generate_netlink_event);
1564
1565 static int genetlink_init(void)
1566 {
1567         int result;
1568
1569         result = genl_register_family(&thermal_event_genl_family);
1570         if (result)
1571                 return result;
1572
1573         result = genl_register_mc_group(&thermal_event_genl_family,
1574                                         &thermal_event_mcgrp);
1575         if (result)
1576                 genl_unregister_family(&thermal_event_genl_family);
1577         return result;
1578 }
1579
1580 static void genetlink_exit(void)
1581 {
1582         genl_unregister_family(&thermal_event_genl_family);
1583 }
1584 #else /* !CONFIG_NET */
1585 static inline int genetlink_init(void) { return 0; }
1586 static inline void genetlink_exit(void) {}
1587 #endif /* !CONFIG_NET */
1588
1589 static int __init thermal_init(void)
1590 {
1591         int result = 0;
1592
1593         result = class_register(&thermal_class);
1594         if (result) {
1595                 idr_destroy(&thermal_tz_idr);
1596                 idr_destroy(&thermal_cdev_idr);
1597                 mutex_destroy(&thermal_idr_lock);
1598                 mutex_destroy(&thermal_list_lock);
1599         }
1600         result = genetlink_init();
1601         return result;
1602 }
1603
1604 static void __exit thermal_exit(void)
1605 {
1606         class_unregister(&thermal_class);
1607         idr_destroy(&thermal_tz_idr);
1608         idr_destroy(&thermal_cdev_idr);
1609         mutex_destroy(&thermal_idr_lock);
1610         mutex_destroy(&thermal_list_lock);
1611         genetlink_exit();
1612 }
1613
1614 fs_initcall(thermal_init);
1615 module_exit(thermal_exit);