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, sizeof(temp->temp_input.name),
 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,
 615                                  sizeof(temp->temp_crit.name),
 616                                 "temp%d_crit", hwmon->count);
 617                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 618                         temp->temp_crit.attr.attr.mode = 0444;
 619                         temp->temp_crit.attr.show = temp_crit_show;
 620                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 621                         result = device_create_file(hwmon->device,
 622                                                     &temp->temp_crit.attr);
 623                         if (result)
 624                                 goto unregister_input;
 625                 }
 626         }
 627
 628         mutex_lock(&thermal_list_lock);
 629         if (new_hwmon_device)
 630                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 631         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 632         mutex_unlock(&thermal_list_lock);
 633
 634         return 0;
 635
 636  unregister_input:
 637         device_remove_file(hwmon->device, &temp->temp_input.attr);
 638  free_temp_mem:
 639         kfree(temp);
 640  unregister_name:
 641         if (new_hwmon_device) {
 642                 device_remove_file(hwmon->device, &dev_attr_name);
 643                 hwmon_device_unregister(hwmon->device);
 644         }
 645  free_mem:
 646         if (new_hwmon_device)
 647                 kfree(hwmon);
 648
 649         return result;
 650 }
 651
 652 static void
 653 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 654 {
 655         struct thermal_hwmon_device *hwmon;
 656         struct thermal_hwmon_temp *temp;
 657
 658         hwmon = thermal_hwmon_lookup_by_type(tz);
 659         if (unlikely(!hwmon)) {
 660                 /* Should never happen... */
 661                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 662                 return;
 663         }
 664
 665         temp = thermal_hwmon_lookup_temp(hwmon, tz);
 666         if (unlikely(!temp)) {
 667                 /* Should never happen... */
 668                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
 669                 return;
 670         }
 671
 672         device_remove_file(hwmon->device, &temp->temp_input.attr);
 673         if (tz->ops->get_crit_temp)
 674                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
 675
 676         mutex_lock(&thermal_list_lock);
 677         list_del(&temp->hwmon_node);
 678         kfree(temp);
 679         if (!list_empty(&hwmon->tz_list)) {
 680                 mutex_unlock(&thermal_list_lock);
 681                 return;
 682         }
 683         list_del(&hwmon->node);
 684         mutex_unlock(&thermal_list_lock);
 685
 686         device_remove_file(hwmon->device, &dev_attr_name);
 687         hwmon_device_unregister(hwmon->device);
 688         kfree(hwmon);
 689 }
 690 #else
 691 static int
 692 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 693 {
 694         return 0;
 695 }
 696
 697 static void
 698 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 699 {
 700 }
 701 #endif
 702
 703 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 704                                             int delay)
 705 {
 706         cancel_delayed_work(&(tz->poll_queue));
 707
 708         if (!delay)
 709                 return;
 710
 711         if (delay > 1000)
 712                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 713                                       round_jiffies(msecs_to_jiffies(delay)));
 714         else
 715                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 716                                       msecs_to_jiffies(delay));
 717 }
 718
 719 static void thermal_zone_device_check(struct work_struct *work)
 720 {
 721         struct thermal_zone_device *tz = container_of(work, struct
 722                                                       thermal_zone_device,
 723                                                       poll_queue.work);
 724         thermal_zone_device_update(tz);
 725 }
 726
 727 /**
 728  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 729  * @tz:         thermal zone device
 730  * @trip:       indicates which trip point the cooling devices is
 731  *              associated with in this thermal zone.
 732  * @cdev:       thermal cooling device
 733  *
 734  * This function is usually called in the thermal zone device .bind callback.
 735  */
 736 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 737                                      int trip,
 738                                      struct thermal_cooling_device *cdev,
 739                                      unsigned long upper, unsigned long lower)
 740 {
 741         struct thermal_instance *dev;
 742         struct thermal_instance *pos;
 743         struct thermal_zone_device *pos1;
 744         struct thermal_cooling_device *pos2;
 745         unsigned long max_state;
 746         int result;
 747
 748         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 749                 return -EINVAL;
 750
 751         list_for_each_entry(pos1, &thermal_tz_list, node) {
 752                 if (pos1 == tz)
 753                         break;
 754         }
 755         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 756                 if (pos2 == cdev)
 757                         break;
 758         }
 759
 760         if (tz != pos1 || cdev != pos2)
 761                 return -EINVAL;
 762
 763         cdev->ops->get_max_state(cdev, &max_state);
 764
 765         /* lower default 0, upper default max_state */
 766         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 767         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 768
 769         if (lower > upper || upper > max_state)
 770                 return -EINVAL;
 771
 772         dev =
 773             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 774         if (!dev)
 775                 return -ENOMEM;
 776         dev->tz = tz;
 777         dev->cdev = cdev;
 778         dev->trip = trip;
 779         dev->upper = upper;
 780         dev->lower = lower;
 781         dev->target = THERMAL_NO_TARGET;
 782
 783         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 784         if (result)
 785                 goto free_mem;
 786
 787         sprintf(dev->name, "cdev%d", dev->id);
 788         result =
 789             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 790         if (result)
 791                 goto release_idr;
 792
 793         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 794         sysfs_attr_init(&dev->attr.attr);
 795         dev->attr.attr.name = dev->attr_name;
 796         dev->attr.attr.mode = 0444;
 797         dev->attr.show = thermal_cooling_device_trip_point_show;
 798         result = device_create_file(&tz->device, &dev->attr);
 799         if (result)
 800                 goto remove_symbol_link;
 801
 802         mutex_lock(&tz->lock);
 803         mutex_lock(&cdev->lock);
 804         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 805             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 806                 result = -EEXIST;
 807                 break;
 808         }
 809         if (!result) {
 810                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 811                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 812         }
 813         mutex_unlock(&cdev->lock);
 814         mutex_unlock(&tz->lock);
 815
 816         if (!result)
 817                 return 0;
 818
 819         device_remove_file(&tz->device, &dev->attr);
 820 remove_symbol_link:
 821         sysfs_remove_link(&tz->device.kobj, dev->name);
 822 release_idr:
 823         release_idr(&tz->idr, &tz->lock, dev->id);
 824 free_mem:
 825         kfree(dev);
 826         return result;
 827 }
 828 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 829
 830 /**
 831  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 832  * @tz:         thermal zone device
 833  * @trip:       indicates which trip point the cooling devices is
 834  *              associated with in this thermal zone.
 835  * @cdev:       thermal cooling device
 836  *
 837  * This function is usually called in the thermal zone device .unbind callback.
 838  */
 839 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 840                                        int trip,
 841                                        struct thermal_cooling_device *cdev)
 842 {
 843         struct thermal_instance *pos, *next;
 844
 845         mutex_lock(&tz->lock);
 846         mutex_lock(&cdev->lock);
 847         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 848                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 849                         list_del(&pos->tz_node);
 850                         list_del(&pos->cdev_node);
 851                         mutex_unlock(&cdev->lock);
 852                         mutex_unlock(&tz->lock);
 853                         goto unbind;
 854                 }
 855         }
 856         mutex_unlock(&cdev->lock);
 857         mutex_unlock(&tz->lock);
 858
 859         return -ENODEV;
 860
 861 unbind:
 862         device_remove_file(&tz->device, &pos->attr);
 863         sysfs_remove_link(&tz->device.kobj, pos->name);
 864         release_idr(&tz->idr, &tz->lock, pos->id);
 865         kfree(pos);
 866         return 0;
 867 }
 868 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 869
 870 static void thermal_release(struct device *dev)
 871 {
 872         struct thermal_zone_device *tz;
 873         struct thermal_cooling_device *cdev;
 874
 875         if (!strncmp(dev_name(dev), "thermal_zone",
 876                      sizeof("thermal_zone") - 1)) {
 877                 tz = to_thermal_zone(dev);
 878                 kfree(tz);
 879         } else {
 880                 cdev = to_cooling_device(dev);
 881                 kfree(cdev);
 882         }
 883 }
 884
 885 static struct class thermal_class = {
 886         .name = "thermal",
 887         .dev_release = thermal_release,
 888 };
 889
 890 /**
 891  * thermal_cooling_device_register - register a new thermal cooling device
 892  * @type:       the thermal cooling device type.
 893  * @devdata:    device private data.
 894  * @ops:                standard thermal cooling devices callbacks.
 895  */
 896 struct thermal_cooling_device *
 897 thermal_cooling_device_register(char *type, void *devdata,
 898                                 const struct thermal_cooling_device_ops *ops)
 899 {
 900         struct thermal_cooling_device *cdev;
 901         struct thermal_zone_device *pos;
 902         int result;
 903
 904         if (strlen(type) >= THERMAL_NAME_LENGTH)
 905                 return ERR_PTR(-EINVAL);
 906
 907         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 908             !ops->set_cur_state)
 909                 return ERR_PTR(-EINVAL);
 910
 911         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 912         if (!cdev)
 913                 return ERR_PTR(-ENOMEM);
 914
 915         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 916         if (result) {
 917                 kfree(cdev);
 918                 return ERR_PTR(result);
 919         }
 920
 921         strcpy(cdev->type, type);
 922         mutex_init(&cdev->lock);
 923         INIT_LIST_HEAD(&cdev->thermal_instances);
 924         cdev->ops = ops;
 925         cdev->updated = true;
 926         cdev->device.class = &thermal_class;
 927         cdev->devdata = devdata;
 928         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 929         result = device_register(&cdev->device);
 930         if (result) {
 931                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 932                 kfree(cdev);
 933                 return ERR_PTR(result);
 934         }
 935
 936         /* sys I/F */
 937         if (type) {
 938                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 939                 if (result)
 940                         goto unregister;
 941         }
 942
 943         result = device_create_file(&cdev->device, &dev_attr_max_state);
 944         if (result)
 945                 goto unregister;
 946
 947         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 948         if (result)
 949                 goto unregister;
 950
 951         mutex_lock(&thermal_list_lock);
 952         list_add(&cdev->node, &thermal_cdev_list);
 953         list_for_each_entry(pos, &thermal_tz_list, node) {
 954                 if (!pos->ops->bind)
 955                         continue;
 956                 result = pos->ops->bind(pos, cdev);
 957                 if (result)
 958                         break;
 959
 960         }
 961         mutex_unlock(&thermal_list_lock);
 962
 963         if (!result)
 964                 return cdev;
 965
 966 unregister:
 967         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 968         device_unregister(&cdev->device);
 969         return ERR_PTR(result);
 970 }
 971 EXPORT_SYMBOL(thermal_cooling_device_register);
 972
 973 /**
 974  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 975  * @cdev:       the thermal cooling device to remove.
 976  *
 977  * thermal_cooling_device_unregister() must be called when the device is no
 978  * longer needed.
 979  */
 980 void thermal_cooling_device_unregister(struct
 981                                        thermal_cooling_device
 982                                        *cdev)
 983 {
 984         struct thermal_zone_device *tz;
 985         struct thermal_cooling_device *pos = NULL;
 986
 987         if (!cdev)
 988                 return;
 989
 990         mutex_lock(&thermal_list_lock);
 991         list_for_each_entry(pos, &thermal_cdev_list, node)
 992             if (pos == cdev)
 993                 break;
 994         if (pos != cdev) {
 995                 /* thermal cooling device not found */
 996                 mutex_unlock(&thermal_list_lock);
 997                 return;
 998         }
 999         list_del(&cdev->node);
1000         list_for_each_entry(tz, &thermal_tz_list, node) {
1001                 if (!tz->ops->unbind)
1002                         continue;
1003                 tz->ops->unbind(tz, cdev);
1004         }
1005         mutex_unlock(&thermal_list_lock);
1006         if (cdev->type[0])
1007                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1008         device_remove_file(&cdev->device, &dev_attr_max_state);
1009         device_remove_file(&cdev->device, &dev_attr_cur_state);
1010
1011         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1012         device_unregister(&cdev->device);
1013         return;
1014 }
1015 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1016
1017 static void thermal_cdev_do_update(struct thermal_cooling_device *cdev)
1018 {
1019         struct thermal_instance *instance;
1020         unsigned long target = 0;
1021
1022         /* cooling device is updated*/
1023         if (cdev->updated)
1024                 return;
1025
1026         mutex_lock(&cdev->lock);
1027         /* Make sure cdev enters the deepest cooling state */
1028         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1029                 if (instance->target == THERMAL_NO_TARGET)
1030                         continue;
1031                 if (instance->target > target)
1032                         target = instance->target;
1033         }
1034         mutex_unlock(&cdev->lock);
1035         cdev->ops->set_cur_state(cdev, target);
1036         cdev->updated = true;
1037 }
1038
1039 static void thermal_zone_do_update(struct thermal_zone_device *tz)
1040 {
1041         struct thermal_instance *instance;
1042
1043         list_for_each_entry(instance, &tz->thermal_instances, tz_node)
1044                 thermal_cdev_do_update(instance->cdev);
1045 }
1046
1047 /*
1048  * Cooling algorithm for both active and passive cooling
1049  *
1050  * 1. if the temperature is higher than a trip point,
1051  *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
1052  *       state for this trip point
1053  *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
1054  *       state for this trip point
1055  *
1056  * 2. if the temperature is lower than a trip point, use lower
1057  *    cooling state for this trip point
1058  *
1059  * Note that this behaves the same as the previous passive cooling
1060  * algorithm.
1061  */
1062
1063 static void thermal_zone_trip_update(struct thermal_zone_device *tz,
1064                                      int trip, long temp)
1065 {
1066         struct thermal_instance *instance;
1067         struct thermal_cooling_device *cdev = NULL;
1068         unsigned long cur_state, max_state;
1069         long trip_temp;
1070         enum thermal_trip_type trip_type;
1071         enum thermal_trend trend;
1072
1073         if (trip == THERMAL_TRIPS_NONE) {
1074                 trip_temp = tz->forced_passive;
1075                 trip_type = THERMAL_TRIPS_NONE;
1076         } else {
1077                 tz->ops->get_trip_temp(tz, trip, &trip_temp);
1078                 tz->ops->get_trip_type(tz, trip, &trip_type);
1079         }
1080
1081         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
1082                 /*
1083                  * compare the current temperature and previous temperature
1084                  * to get the thermal trend, if no special requirement
1085                  */
1086                 if (tz->temperature > tz->last_temperature)
1087                         trend = THERMAL_TREND_RAISING;
1088                 else if (tz->temperature < tz->last_temperature)
1089                         trend = THERMAL_TREND_DROPPING;
1090                 else
1091                         trend = THERMAL_TREND_STABLE;
1092         }
1093
1094         if (temp >= trip_temp) {
1095                 list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1096                         if (instance->trip != trip)
1097                                 continue;
1098
1099                         cdev = instance->cdev;
1100
1101                         cdev->ops->get_cur_state(cdev, &cur_state);
1102                         cdev->ops->get_max_state(cdev, &max_state);
1103
1104                         if (trend == THERMAL_TREND_RAISING) {
1105                                 cur_state = cur_state < instance->upper ?
1106                                             (cur_state + 1) : instance->upper;
1107                         } else if (trend == THERMAL_TREND_DROPPING) {
1108                                 cur_state = cur_state > instance->lower ?
1109                                     (cur_state - 1) : instance->lower;
1110                         }
1111
1112                         /* activate a passive thermal instance */
1113                         if ((trip_type == THERMAL_TRIP_PASSIVE ||
1114                              trip_type == THERMAL_TRIPS_NONE) &&
1115                              instance->target == THERMAL_NO_TARGET)
1116                                 tz->passive++;
1117
1118                         instance->target = cur_state;
1119                         cdev->updated = false; /* cooling device needs update */
1120                 }
1121         } else {        /* below trip */
1122                 list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1123                         if (instance->trip != trip)
1124                                 continue;
1125
1126                         /* Do not use the inactive thermal instance */
1127                         if (instance->target == THERMAL_NO_TARGET)
1128                                 continue;
1129                         cdev = instance->cdev;
1130                         cdev->ops->get_cur_state(cdev, &cur_state);
1131
1132                         cur_state = cur_state > instance->lower ?
1133                                     (cur_state - 1) : THERMAL_NO_TARGET;
1134
1135                         /* deactivate a passive thermal instance */
1136                         if ((trip_type == THERMAL_TRIP_PASSIVE ||
1137                              trip_type == THERMAL_TRIPS_NONE) &&
1138                              cur_state == THERMAL_NO_TARGET)
1139                                 tz->passive--;
1140                         instance->target = cur_state;
1141                         cdev->updated = false; /* cooling device needs update */
1142                 }
1143         }
1144
1145         return;
1146 }
1147 /**
1148  * thermal_zone_device_update - force an update of a thermal zone's state
1149  * @ttz:        the thermal zone to update
1150  */
1151
1152 void thermal_zone_device_update(struct thermal_zone_device *tz)
1153 {
1154         int count, ret = 0;
1155         long temp, trip_temp;
1156         enum thermal_trip_type trip_type;
1157
1158         mutex_lock(&tz->lock);
1159
1160         if (tz->ops->get_temp(tz, &temp)) {
1161                 /* get_temp failed - retry it later */
1162                 pr_warn("failed to read out thermal zone %d\n", tz->id);
1163                 goto leave;
1164         }
1165
1166         tz->last_temperature = tz->temperature;
1167         tz->temperature = temp;
1168
1169         for (count = 0; count < tz->trips; count++) {
1170                 tz->ops->get_trip_type(tz, count, &trip_type);
1171                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1172
1173                 switch (trip_type) {
1174                 case THERMAL_TRIP_CRITICAL:
1175                         if (temp >= trip_temp) {
1176                                 if (tz->ops->notify)
1177                                         ret = tz->ops->notify(tz, count,
1178                                                               trip_type);
1179                                 if (!ret) {
1180                                         pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1181                                                  temp/1000);
1182                                         orderly_poweroff(true);
1183                                 }
1184                         }
1185                         break;
1186                 case THERMAL_TRIP_HOT:
1187                         if (temp >= trip_temp)
1188                                 if (tz->ops->notify)
1189                                         tz->ops->notify(tz, count, trip_type);
1190                         break;
1191                 case THERMAL_TRIP_ACTIVE:
1192                         thermal_zone_trip_update(tz, count, temp);
1193                         break;
1194                 case THERMAL_TRIP_PASSIVE:
1195                         if (temp >= trip_temp || tz->passive)
1196                                 thermal_zone_trip_update(tz, count, temp);
1197                         break;
1198                 }
1199         }
1200
1201         if (tz->forced_passive)
1202                 thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
1203         thermal_zone_do_update(tz);
1204
1205 leave:
1206         if (tz->passive)
1207                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1208         else if (tz->polling_delay)
1209                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1210         else
1211                 thermal_zone_device_set_polling(tz, 0);
1212         mutex_unlock(&tz->lock);
1213 }
1214 EXPORT_SYMBOL(thermal_zone_device_update);
1215
1216 /**
1217  * create_trip_attrs - create attributes for trip points
1218  * @tz:         the thermal zone device
1219  * @mask:       Writeable trip point bitmap.
1220  */
1221 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1222 {
1223         int indx;
1224         int size = sizeof(struct thermal_attr) * tz->trips;
1225
1226         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1227         if (!tz->trip_type_attrs)
1228                 return -ENOMEM;
1229
1230         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1231         if (!tz->trip_temp_attrs) {
1232                 kfree(tz->trip_type_attrs);
1233                 return -ENOMEM;
1234         }
1235
1236         if (tz->ops->get_trip_hyst) {
1237                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1238                 if (!tz->trip_hyst_attrs) {
1239                         kfree(tz->trip_type_attrs);
1240                         kfree(tz->trip_temp_attrs);
1241                         return -ENOMEM;
1242                 }
1243         }
1244
1245
1246         for (indx = 0; indx < tz->trips; indx++) {
1247                 /* create trip type attribute */
1248                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1249                          "trip_point_%d_type", indx);
1250
1251                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1252                 tz->trip_type_attrs[indx].attr.attr.name =
1253                                                 tz->trip_type_attrs[indx].name;
1254                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1255                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1256
1257                 device_create_file(&tz->device,
1258                                    &tz->trip_type_attrs[indx].attr);
1259
1260                 /* create trip temp attribute */
1261                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1262                          "trip_point_%d_temp", indx);
1263
1264                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1265                 tz->trip_temp_attrs[indx].attr.attr.name =
1266                                                 tz->trip_temp_attrs[indx].name;
1267                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1268                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1269                 if (mask & (1 << indx)) {
1270                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1271                         tz->trip_temp_attrs[indx].attr.store =
1272                                                         trip_point_temp_store;
1273                 }
1274
1275                 device_create_file(&tz->device,
1276                                    &tz->trip_temp_attrs[indx].attr);
1277
1278                 /* create Optional trip hyst attribute */
1279                 if (!tz->ops->get_trip_hyst)
1280                         continue;
1281                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1282                          "trip_point_%d_hyst", indx);
1283
1284                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1285                 tz->trip_hyst_attrs[indx].attr.attr.name =
1286                                         tz->trip_hyst_attrs[indx].name;
1287                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1288                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1289                 if (tz->ops->set_trip_hyst) {
1290                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1291                         tz->trip_hyst_attrs[indx].attr.store =
1292                                         trip_point_hyst_store;
1293                 }
1294
1295                 device_create_file(&tz->device,
1296                                    &tz->trip_hyst_attrs[indx].attr);
1297         }
1298         return 0;
1299 }
1300
1301 static void remove_trip_attrs(struct thermal_zone_device *tz)
1302 {
1303         int indx;
1304
1305         for (indx = 0; indx < tz->trips; indx++) {
1306                 device_remove_file(&tz->device,
1307                                    &tz->trip_type_attrs[indx].attr);
1308                 device_remove_file(&tz->device,
1309                                    &tz->trip_temp_attrs[indx].attr);
1310                 if (tz->ops->get_trip_hyst)
1311                         device_remove_file(&tz->device,
1312                                   &tz->trip_hyst_attrs[indx].attr);
1313         }
1314         kfree(tz->trip_type_attrs);
1315         kfree(tz->trip_temp_attrs);
1316         kfree(tz->trip_hyst_attrs);
1317 }
1318
1319 /**
1320  * thermal_zone_device_register - register a new thermal zone device
1321  * @type:       the thermal zone device type
1322  * @trips:      the number of trip points the thermal zone support
1323  * @mask:       a bit string indicating the writeablility of trip points
1324  * @devdata:    private device data
1325  * @ops:        standard thermal zone device callbacks
1326  * @passive_delay: number of milliseconds to wait between polls when
1327  *                 performing passive cooling
1328  * @polling_delay: number of milliseconds to wait between polls when checking
1329  *                 whether trip points have been crossed (0 for interrupt
1330  *                 driven systems)
1331  *
1332  * thermal_zone_device_unregister() must be called when the device is no
1333  * longer needed. The passive cooling depends on the .get_trend() return value.
1334  */
1335 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1336         int trips, int mask, void *devdata,
1337         const struct thermal_zone_device_ops *ops,
1338         int passive_delay, int polling_delay)
1339 {
1340         struct thermal_zone_device *tz;
1341         struct thermal_cooling_device *pos;
1342         enum thermal_trip_type trip_type;
1343         int result;
1344         int count;
1345         int passive = 0;
1346
1347         if (strlen(type) >= THERMAL_NAME_LENGTH)
1348                 return ERR_PTR(-EINVAL);
1349
1350         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1351                 return ERR_PTR(-EINVAL);
1352
1353         if (!ops || !ops->get_temp)
1354                 return ERR_PTR(-EINVAL);
1355
1356         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1357         if (!tz)
1358                 return ERR_PTR(-ENOMEM);
1359
1360         INIT_LIST_HEAD(&tz->thermal_instances);
1361         idr_init(&tz->idr);
1362         mutex_init(&tz->lock);
1363         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1364         if (result) {
1365                 kfree(tz);
1366                 return ERR_PTR(result);
1367         }
1368
1369         strcpy(tz->type, type);
1370         tz->ops = ops;
1371         tz->device.class = &thermal_class;
1372         tz->devdata = devdata;
1373         tz->trips = trips;
1374         tz->passive_delay = passive_delay;
1375         tz->polling_delay = polling_delay;
1376
1377         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1378         result = device_register(&tz->device);
1379         if (result) {
1380                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1381                 kfree(tz);
1382                 return ERR_PTR(result);
1383         }
1384
1385         /* sys I/F */
1386         if (type) {
1387                 result = device_create_file(&tz->device, &dev_attr_type);
1388                 if (result)
1389                         goto unregister;
1390         }
1391
1392         result = device_create_file(&tz->device, &dev_attr_temp);
1393         if (result)
1394                 goto unregister;
1395
1396         if (ops->get_mode) {
1397                 result = device_create_file(&tz->device, &dev_attr_mode);
1398                 if (result)
1399                         goto unregister;
1400         }
1401
1402         result = create_trip_attrs(tz, mask);
1403         if (result)
1404                 goto unregister;
1405
1406         for (count = 0; count < trips; count++) {
1407                 tz->ops->get_trip_type(tz, count, &trip_type);
1408                 if (trip_type == THERMAL_TRIP_PASSIVE)
1409                         passive = 1;
1410         }
1411
1412         if (!passive)
1413                 result = device_create_file(&tz->device,
1414                                             &dev_attr_passive);
1415
1416         if (result)
1417                 goto unregister;
1418
1419         result = thermal_add_hwmon_sysfs(tz);
1420         if (result)
1421                 goto unregister;
1422
1423         mutex_lock(&thermal_list_lock);
1424         list_add_tail(&tz->node, &thermal_tz_list);
1425         if (ops->bind)
1426                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1427                 result = ops->bind(tz, pos);
1428                 if (result)
1429                         break;
1430                 }
1431         mutex_unlock(&thermal_list_lock);
1432
1433         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1434
1435         thermal_zone_device_update(tz);
1436
1437         if (!result)
1438                 return tz;
1439
1440 unregister:
1441         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1442         device_unregister(&tz->device);
1443         return ERR_PTR(result);
1444 }
1445 EXPORT_SYMBOL(thermal_zone_device_register);
1446
1447 /**
1448  * thermal_device_unregister - removes the registered thermal zone device
1449  * @tz: the thermal zone device to remove
1450  */
1451 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1452 {
1453         struct thermal_cooling_device *cdev;
1454         struct thermal_zone_device *pos = NULL;
1455
1456         if (!tz)
1457                 return;
1458
1459         mutex_lock(&thermal_list_lock);
1460         list_for_each_entry(pos, &thermal_tz_list, node)
1461             if (pos == tz)
1462                 break;
1463         if (pos != tz) {
1464                 /* thermal zone device not found */
1465                 mutex_unlock(&thermal_list_lock);
1466                 return;
1467         }
1468         list_del(&tz->node);
1469         if (tz->ops->unbind)
1470                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1471                     tz->ops->unbind(tz, cdev);
1472         mutex_unlock(&thermal_list_lock);
1473
1474         thermal_zone_device_set_polling(tz, 0);
1475
1476         if (tz->type[0])
1477                 device_remove_file(&tz->device, &dev_attr_type);
1478         device_remove_file(&tz->device, &dev_attr_temp);
1479         if (tz->ops->get_mode)
1480                 device_remove_file(&tz->device, &dev_attr_mode);
1481         remove_trip_attrs(tz);
1482
1483         thermal_remove_hwmon_sysfs(tz);
1484         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1485         idr_destroy(&tz->idr);
1486         mutex_destroy(&tz->lock);
1487         device_unregister(&tz->device);
1488         return;
1489 }
1490 EXPORT_SYMBOL(thermal_zone_device_unregister);
1491
1492 #ifdef CONFIG_NET
1493 static struct genl_family thermal_event_genl_family = {
1494         .id = GENL_ID_GENERATE,
1495         .name = THERMAL_GENL_FAMILY_NAME,
1496         .version = THERMAL_GENL_VERSION,
1497         .maxattr = THERMAL_GENL_ATTR_MAX,
1498 };
1499
1500 static struct genl_multicast_group thermal_event_mcgrp = {
1501         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1502 };
1503
1504 int thermal_generate_netlink_event(u32 orig, enum events event)
1505 {
1506         struct sk_buff *skb;
1507         struct nlattr *attr;
1508         struct thermal_genl_event *thermal_event;
1509         void *msg_header;
1510         int size;
1511         int result;
1512         static unsigned int thermal_event_seqnum;
1513
1514         /* allocate memory */
1515         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1516                nla_total_size(0);
1517
1518         skb = genlmsg_new(size, GFP_ATOMIC);
1519         if (!skb)
1520                 return -ENOMEM;
1521
1522         /* add the genetlink message header */
1523         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1524                                  &thermal_event_genl_family, 0,
1525                                  THERMAL_GENL_CMD_EVENT);
1526         if (!msg_header) {
1527                 nlmsg_free(skb);
1528                 return -ENOMEM;
1529         }
1530
1531         /* fill the data */
1532         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1533                            sizeof(struct thermal_genl_event));
1534
1535         if (!attr) {
1536                 nlmsg_free(skb);
1537                 return -EINVAL;
1538         }
1539
1540         thermal_event = nla_data(attr);
1541         if (!thermal_event) {
1542                 nlmsg_free(skb);
1543                 return -EINVAL;
1544         }
1545
1546         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1547
1548         thermal_event->orig = orig;
1549         thermal_event->event = event;
1550
1551         /* send multicast genetlink message */
1552         result = genlmsg_end(skb, msg_header);
1553         if (result < 0) {
1554                 nlmsg_free(skb);
1555                 return result;
1556         }
1557
1558         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1559         if (result)
1560                 pr_info("failed to send netlink event:%d\n", result);
1561
1562         return result;
1563 }
1564 EXPORT_SYMBOL(thermal_generate_netlink_event);
1565
1566 static int genetlink_init(void)
1567 {
1568         int result;
1569
1570         result = genl_register_family(&thermal_event_genl_family);
1571         if (result)
1572                 return result;
1573
1574         result = genl_register_mc_group(&thermal_event_genl_family,
1575                                         &thermal_event_mcgrp);
1576         if (result)
1577                 genl_unregister_family(&thermal_event_genl_family);
1578         return result;
1579 }
1580
1581 static void genetlink_exit(void)
1582 {
1583         genl_unregister_family(&thermal_event_genl_family);
1584 }
1585 #else /* !CONFIG_NET */
1586 static inline int genetlink_init(void) { return 0; }
1587 static inline void genetlink_exit(void) {}
1588 #endif /* !CONFIG_NET */
1589
1590 static int __init thermal_init(void)
1591 {
1592         int result = 0;
1593
1594         result = class_register(&thermal_class);
1595         if (result) {
1596                 idr_destroy(&thermal_tz_idr);
1597                 idr_destroy(&thermal_cdev_idr);
1598                 mutex_destroy(&thermal_idr_lock);
1599                 mutex_destroy(&thermal_list_lock);
1600         }
1601         result = genetlink_init();
1602         return result;
1603 }
1604
1605 static void __exit thermal_exit(void)
1606 {
1607         class_unregister(&thermal_class);
1608         idr_destroy(&thermal_tz_idr);
1609         idr_destroy(&thermal_cdev_idr);
1610         mutex_destroy(&thermal_idr_lock);
1611         mutex_destroy(&thermal_list_lock);
1612         genetlink_exit();
1613 }
1614
1615 fs_initcall(thermal_init);
1616 module_exit(thermal_exit);