drivers/thermal/thermal_sys.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/reboot.h>
  37 #include <net/netlink.h>
  38 #include <net/genetlink.h>
  39
  40 MODULE_AUTHOR("Zhang Rui");
  41 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  42 MODULE_LICENSE("GPL");
  43
  44 /*
  45  * This structure is used to describe the behavior of
  46  * a certain cooling device on a certain trip point
  47  * in a certain thermal zone
  48  */
  49 struct thermal_instance {
  50         int id;
  51         char name[THERMAL_NAME_LENGTH];
  52         struct thermal_zone_device *tz;
  53         struct thermal_cooling_device *cdev;
  54         int trip;
  55         unsigned long upper;    /* Highest cooling state for this trip point */
  56         unsigned long lower;    /* Lowest cooling state for this trip point */
  57         char attr_name[THERMAL_NAME_LENGTH];
  58         struct device_attribute attr;
  59         struct list_head tz_node; /* node in tz->thermal_instances */
  60         struct list_head cdev_node; /* node in cdev->thermal_instances */
  61 };
  62
  63 static DEFINE_IDR(thermal_tz_idr);
  64 static DEFINE_IDR(thermal_cdev_idr);
  65 static DEFINE_MUTEX(thermal_idr_lock);
  66
  67 static LIST_HEAD(thermal_tz_list);
  68 static LIST_HEAD(thermal_cdev_list);
  69 static DEFINE_MUTEX(thermal_list_lock);
  70
  71 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  72 {
  73         int err;
  74
  75 again:
  76         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  77                 return -ENOMEM;
  78
  79         if (lock)
  80                 mutex_lock(lock);
  81         err = idr_get_new(idr, NULL, id);
  82         if (lock)
  83                 mutex_unlock(lock);
  84         if (unlikely(err == -EAGAIN))
  85                 goto again;
  86         else if (unlikely(err))
  87                 return err;
  88
  89         *id = *id & MAX_ID_MASK;
  90         return 0;
  91 }
  92
  93 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  94 {
  95         if (lock)
  96                 mutex_lock(lock);
  97         idr_remove(idr, id);
  98         if (lock)
  99                 mutex_unlock(lock);
 100 }
 101
 102 /* sys I/F for thermal zone */
 103
 104 #define to_thermal_zone(_dev) \
 105         container_of(_dev, struct thermal_zone_device, device)
 106
 107 static ssize_t
 108 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 109 {
 110         struct thermal_zone_device *tz = to_thermal_zone(dev);
 111
 112         return sprintf(buf, "%s\n", tz->type);
 113 }
 114
 115 static ssize_t
 116 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 117 {
 118         struct thermal_zone_device *tz = to_thermal_zone(dev);
 119         long temperature;
 120         int ret;
 121
 122         if (!tz->ops->get_temp)
 123                 return -EPERM;
 124
 125         ret = tz->ops->get_temp(tz, &temperature);
 126
 127         if (ret)
 128                 return ret;
 129
 130         return sprintf(buf, "%ld\n", temperature);
 131 }
 132
 133 static ssize_t
 134 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 135 {
 136         struct thermal_zone_device *tz = to_thermal_zone(dev);
 137         enum thermal_device_mode mode;
 138         int result;
 139
 140         if (!tz->ops->get_mode)
 141                 return -EPERM;
 142
 143         result = tz->ops->get_mode(tz, &mode);
 144         if (result)
 145                 return result;
 146
 147         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 148                        : "disabled");
 149 }
 150
 151 static ssize_t
 152 mode_store(struct device *dev, struct device_attribute *attr,
 153            const char *buf, size_t count)
 154 {
 155         struct thermal_zone_device *tz = to_thermal_zone(dev);
 156         int result;
 157
 158         if (!tz->ops->set_mode)
 159                 return -EPERM;
 160
 161         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 162                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 163         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 164                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 165         else
 166                 result = -EINVAL;
 167
 168         if (result)
 169                 return result;
 170
 171         return count;
 172 }
 173
 174 static ssize_t
 175 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 176                      char *buf)
 177 {
 178         struct thermal_zone_device *tz = to_thermal_zone(dev);
 179         enum thermal_trip_type type;
 180         int trip, result;
 181
 182         if (!tz->ops->get_trip_type)
 183                 return -EPERM;
 184
 185         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 186                 return -EINVAL;
 187
 188         result = tz->ops->get_trip_type(tz, trip, &type);
 189         if (result)
 190                 return result;
 191
 192         switch (type) {
 193         case THERMAL_TRIP_CRITICAL:
 194                 return sprintf(buf, "critical\n");
 195         case THERMAL_TRIP_HOT:
 196                 return sprintf(buf, "hot\n");
 197         case THERMAL_TRIP_PASSIVE:
 198                 return sprintf(buf, "passive\n");
 199         case THERMAL_TRIP_ACTIVE:
 200                 return sprintf(buf, "active\n");
 201         default:
 202                 return sprintf(buf, "unknown\n");
 203         }
 204 }
 205
 206 static ssize_t
 207 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 208                      const char *buf, size_t count)
 209 {
 210         struct thermal_zone_device *tz = to_thermal_zone(dev);
 211         int trip, ret;
 212         unsigned long temperature;
 213
 214         if (!tz->ops->set_trip_temp)
 215                 return -EPERM;
 216
 217         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 218                 return -EINVAL;
 219
 220         if (kstrtoul(buf, 10, &temperature))
 221                 return -EINVAL;
 222
 223         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 224
 225         return ret ? ret : count;
 226 }
 227
 228 static ssize_t
 229 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 230                      char *buf)
 231 {
 232         struct thermal_zone_device *tz = to_thermal_zone(dev);
 233         int trip, ret;
 234         long temperature;
 235
 236         if (!tz->ops->get_trip_temp)
 237                 return -EPERM;
 238
 239         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 240                 return -EINVAL;
 241
 242         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 243
 244         if (ret)
 245                 return ret;
 246
 247         return sprintf(buf, "%ld\n", temperature);
 248 }
 249
 250 static ssize_t
 251 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 252                         const char *buf, size_t count)
 253 {
 254         struct thermal_zone_device *tz = to_thermal_zone(dev);
 255         int trip, ret;
 256         unsigned long temperature;
 257
 258         if (!tz->ops->set_trip_hyst)
 259                 return -EPERM;
 260
 261         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 262                 return -EINVAL;
 263
 264         if (kstrtoul(buf, 10, &temperature))
 265                 return -EINVAL;
 266
 267         /*
 268          * We are not doing any check on the 'temperature' value
 269          * here. The driver implementing 'set_trip_hyst' has to
 270          * take care of this.
 271          */
 272         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 273
 274         return ret ? ret : count;
 275 }
 276
 277 static ssize_t
 278 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 279                         char *buf)
 280 {
 281         struct thermal_zone_device *tz = to_thermal_zone(dev);
 282         int trip, ret;
 283         unsigned long temperature;
 284
 285         if (!tz->ops->get_trip_hyst)
 286                 return -EPERM;
 287
 288         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 289                 return -EINVAL;
 290
 291         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 292
 293         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 294 }
 295
 296 static ssize_t
 297 passive_store(struct device *dev, struct device_attribute *attr,
 298                     const char *buf, size_t count)
 299 {
 300         struct thermal_zone_device *tz = to_thermal_zone(dev);
 301         struct thermal_cooling_device *cdev = NULL;
 302         int state;
 303
 304         if (!sscanf(buf, "%d\n", &state))
 305                 return -EINVAL;
 306
 307         /* sanity check: values below 1000 millicelcius don't make sense
 308          * and can cause the system to go into a thermal heart attack
 309          */
 310         if (state && state < 1000)
 311                 return -EINVAL;
 312
 313         if (state && !tz->forced_passive) {
 314                 mutex_lock(&thermal_list_lock);
 315                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 316                         if (!strncmp("Processor", cdev->type,
 317                                      sizeof("Processor")))
 318                                 thermal_zone_bind_cooling_device(tz,
 319                                                 THERMAL_TRIPS_NONE, cdev,
 320                                                 THERMAL_NO_LIMIT,
 321                                                 THERMAL_NO_LIMIT);
 322                 }
 323                 mutex_unlock(&thermal_list_lock);
 324                 if (!tz->passive_delay)
 325                         tz->passive_delay = 1000;
 326         } else if (!state && tz->forced_passive) {
 327                 mutex_lock(&thermal_list_lock);
 328                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 329                         if (!strncmp("Processor", cdev->type,
 330                                      sizeof("Processor")))
 331                                 thermal_zone_unbind_cooling_device(tz,
 332                                                                    THERMAL_TRIPS_NONE,
 333                                                                    cdev);
 334                 }
 335                 mutex_unlock(&thermal_list_lock);
 336                 tz->passive_delay = 0;
 337         }
 338
 339         tz->forced_passive = state;
 340
 341         thermal_zone_device_update(tz);
 342
 343         return count;
 344 }
 345
 346 static ssize_t
 347 passive_show(struct device *dev, struct device_attribute *attr,
 348                    char *buf)
 349 {
 350         struct thermal_zone_device *tz = to_thermal_zone(dev);
 351
 352         return sprintf(buf, "%d\n", tz->forced_passive);
 353 }
 354
 355 static DEVICE_ATTR(type, 0444, type_show, NULL);
 356 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 357 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 358 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 359
 360 /* sys I/F for cooling device */
 361 #define to_cooling_device(_dev) \
 362         container_of(_dev, struct thermal_cooling_device, device)
 363
 364 static ssize_t
 365 thermal_cooling_device_type_show(struct device *dev,
 366                                  struct device_attribute *attr, char *buf)
 367 {
 368         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 369
 370         return sprintf(buf, "%s\n", cdev->type);
 371 }
 372
 373 static ssize_t
 374 thermal_cooling_device_max_state_show(struct device *dev,
 375                                       struct device_attribute *attr, char *buf)
 376 {
 377         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 378         unsigned long state;
 379         int ret;
 380
 381         ret = cdev->ops->get_max_state(cdev, &state);
 382         if (ret)
 383                 return ret;
 384         return sprintf(buf, "%ld\n", state);
 385 }
 386
 387 static ssize_t
 388 thermal_cooling_device_cur_state_show(struct device *dev,
 389                                       struct device_attribute *attr, char *buf)
 390 {
 391         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 392         unsigned long state;
 393         int ret;
 394
 395         ret = cdev->ops->get_cur_state(cdev, &state);
 396         if (ret)
 397                 return ret;
 398         return sprintf(buf, "%ld\n", state);
 399 }
 400
 401 static ssize_t
 402 thermal_cooling_device_cur_state_store(struct device *dev,
 403                                        struct device_attribute *attr,
 404                                        const char *buf, size_t count)
 405 {
 406         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 407         unsigned long state;
 408         int result;
 409
 410         if (!sscanf(buf, "%ld\n", &state))
 411                 return -EINVAL;
 412
 413         if ((long)state < 0)
 414                 return -EINVAL;
 415
 416         result = cdev->ops->set_cur_state(cdev, state);
 417         if (result)
 418                 return result;
 419         return count;
 420 }
 421
 422 static struct device_attribute dev_attr_cdev_type =
 423 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 424 static DEVICE_ATTR(max_state, 0444,
 425                    thermal_cooling_device_max_state_show, NULL);
 426 static DEVICE_ATTR(cur_state, 0644,
 427                    thermal_cooling_device_cur_state_show,
 428                    thermal_cooling_device_cur_state_store);
 429
 430 static ssize_t
 431 thermal_cooling_device_trip_point_show(struct device *dev,
 432                                        struct device_attribute *attr, char *buf)
 433 {
 434         struct thermal_instance *instance;
 435
 436         instance =
 437             container_of(attr, struct thermal_instance, attr);
 438
 439         if (instance->trip == THERMAL_TRIPS_NONE)
 440                 return sprintf(buf, "-1\n");
 441         else
 442                 return sprintf(buf, "%d\n", instance->trip);
 443 }
 444
 445 /* Device management */
 446
 447 #if defined(CONFIG_THERMAL_HWMON)
 448
 449 /* hwmon sys I/F */
 450 #include <linux/hwmon.h>
 451
 452 /* thermal zone devices with the same type share one hwmon device */
 453 struct thermal_hwmon_device {
 454         char type[THERMAL_NAME_LENGTH];
 455         struct device *device;
 456         int count;
 457         struct list_head tz_list;
 458         struct list_head node;
 459 };
 460
 461 struct thermal_hwmon_attr {
 462         struct device_attribute attr;
 463         char name[16];
 464 };
 465
 466 /* one temperature input for each thermal zone */
 467 struct thermal_hwmon_temp {
 468         struct list_head hwmon_node;
 469         struct thermal_zone_device *tz;
 470         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 471         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 472 };
 473
 474 static LIST_HEAD(thermal_hwmon_list);
 475
 476 static ssize_t
 477 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 478 {
 479         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 480         return sprintf(buf, "%s\n", hwmon->type);
 481 }
 482 static DEVICE_ATTR(name, 0444, name_show, NULL);
 483
 484 static ssize_t
 485 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 486 {
 487         long temperature;
 488         int ret;
 489         struct thermal_hwmon_attr *hwmon_attr
 490                         = container_of(attr, struct thermal_hwmon_attr, attr);
 491         struct thermal_hwmon_temp *temp
 492                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 493                                        temp_input);
 494         struct thermal_zone_device *tz = temp->tz;
 495
 496         ret = tz->ops->get_temp(tz, &temperature);
 497
 498         if (ret)
 499                 return ret;
 500
 501         return sprintf(buf, "%ld\n", temperature);
 502 }
 503
 504 static ssize_t
 505 temp_crit_show(struct device *dev, struct device_attribute *attr,
 506                 char *buf)
 507 {
 508         struct thermal_hwmon_attr *hwmon_attr
 509                         = container_of(attr, struct thermal_hwmon_attr, attr);
 510         struct thermal_hwmon_temp *temp
 511                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 512                                        temp_crit);
 513         struct thermal_zone_device *tz = temp->tz;
 514         long temperature;
 515         int ret;
 516
 517         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 518         if (ret)
 519                 return ret;
 520
 521         return sprintf(buf, "%ld\n", temperature);
 522 }
 523
 524
 525 static struct thermal_hwmon_device *
 526 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 527 {
 528         struct thermal_hwmon_device *hwmon;
 529
 530         mutex_lock(&thermal_list_lock);
 531         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 532                 if (!strcmp(hwmon->type, tz->type)) {
 533                         mutex_unlock(&thermal_list_lock);
 534                         return hwmon;
 535                 }
 536         mutex_unlock(&thermal_list_lock);
 537
 538         return NULL;
 539 }
 540
 541 /* Find the temperature input matching a given thermal zone */
 542 static struct thermal_hwmon_temp *
 543 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 544                           const struct thermal_zone_device *tz)
 545 {
 546         struct thermal_hwmon_temp *temp;
 547
 548         mutex_lock(&thermal_list_lock);
 549         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 550                 if (temp->tz == tz) {
 551                         mutex_unlock(&thermal_list_lock);
 552                         return temp;
 553                 }
 554         mutex_unlock(&thermal_list_lock);
 555
 556         return NULL;
 557 }
 558
 559 static int
 560 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 561 {
 562         struct thermal_hwmon_device *hwmon;
 563         struct thermal_hwmon_temp *temp;
 564         int new_hwmon_device = 1;
 565         int result;
 566
 567         hwmon = thermal_hwmon_lookup_by_type(tz);
 568         if (hwmon) {
 569                 new_hwmon_device = 0;
 570                 goto register_sys_interface;
 571         }
 572
 573         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 574         if (!hwmon)
 575                 return -ENOMEM;
 576
 577         INIT_LIST_HEAD(&hwmon->tz_list);
 578         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 579         hwmon->device = hwmon_device_register(NULL);
 580         if (IS_ERR(hwmon->device)) {
 581                 result = PTR_ERR(hwmon->device);
 582                 goto free_mem;
 583         }
 584         dev_set_drvdata(hwmon->device, hwmon);
 585         result = device_create_file(hwmon->device, &dev_attr_name);
 586         if (result)
 587                 goto free_mem;
 588
 589  register_sys_interface:
 590         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 591         if (!temp) {
 592                 result = -ENOMEM;
 593                 goto unregister_name;
 594         }
 595
 596         temp->tz = tz;
 597         hwmon->count++;
 598
 599         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
 600                  "temp%d_input", hwmon->count);
 601         temp->temp_input.attr.attr.name = temp->temp_input.name;
 602         temp->temp_input.attr.attr.mode = 0444;
 603         temp->temp_input.attr.show = temp_input_show;
 604         sysfs_attr_init(&temp->temp_input.attr.attr);
 605         result = device_create_file(hwmon->device, &temp->temp_input.attr);
 606         if (result)
 607                 goto free_temp_mem;
 608
 609         if (tz->ops->get_crit_temp) {
 610                 unsigned long temperature;
 611                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 612                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
 613                                 "temp%d_crit", hwmon->count);
 614                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 615                         temp->temp_crit.attr.attr.mode = 0444;
 616                         temp->temp_crit.attr.show = temp_crit_show;
 617                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 618                         result = device_create_file(hwmon->device,
 619                                                     &temp->temp_crit.attr);
 620                         if (result)
 621                                 goto unregister_input;
 622                 }
 623         }
 624
 625         mutex_lock(&thermal_list_lock);
 626         if (new_hwmon_device)
 627                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 628         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 629         mutex_unlock(&thermal_list_lock);
 630
 631         return 0;
 632
 633  unregister_input:
 634         device_remove_file(hwmon->device, &temp->temp_input.attr);
 635  free_temp_mem:
 636         kfree(temp);
 637  unregister_name:
 638         if (new_hwmon_device) {
 639                 device_remove_file(hwmon->device, &dev_attr_name);
 640                 hwmon_device_unregister(hwmon->device);
 641         }
 642  free_mem:
 643         if (new_hwmon_device)
 644                 kfree(hwmon);
 645
 646         return result;
 647 }
 648
 649 static void
 650 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 651 {
 652         struct thermal_hwmon_device *hwmon;
 653         struct thermal_hwmon_temp *temp;
 654
 655         hwmon = thermal_hwmon_lookup_by_type(tz);
 656         if (unlikely(!hwmon)) {
 657                 /* Should never happen... */
 658                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 659                 return;
 660         }
 661
 662         temp = thermal_hwmon_lookup_temp(hwmon, tz);
 663         if (unlikely(!temp)) {
 664                 /* Should never happen... */
 665                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
 666                 return;
 667         }
 668
 669         device_remove_file(hwmon->device, &temp->temp_input.attr);
 670         if (tz->ops->get_crit_temp)
 671                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
 672
 673         mutex_lock(&thermal_list_lock);
 674         list_del(&temp->hwmon_node);
 675         kfree(temp);
 676         if (!list_empty(&hwmon->tz_list)) {
 677                 mutex_unlock(&thermal_list_lock);
 678                 return;
 679         }
 680         list_del(&hwmon->node);
 681         mutex_unlock(&thermal_list_lock);
 682
 683         device_remove_file(hwmon->device, &dev_attr_name);
 684         hwmon_device_unregister(hwmon->device);
 685         kfree(hwmon);
 686 }
 687 #else
 688 static int
 689 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 690 {
 691         return 0;
 692 }
 693
 694 static void
 695 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 696 {
 697 }
 698 #endif
 699
 700 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 701                                             int delay)
 702 {
 703         cancel_delayed_work(&(tz->poll_queue));
 704
 705         if (!delay)
 706                 return;
 707
 708         if (delay > 1000)
 709                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 710                                       round_jiffies(msecs_to_jiffies(delay)));
 711         else
 712                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
 713                                       msecs_to_jiffies(delay));
 714 }
 715
 716 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 717                                         int temp, int trip_temp, int trip)
 718 {
 719         enum thermal_trend trend;
 720         struct thermal_instance *instance;
 721         struct thermal_cooling_device *cdev;
 722         long state, max_state;
 723
 724         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
 725                 /*
 726                  * compare the current temperature and previous temperature
 727                  * to get the thermal trend, if no special requirement
 728                  */
 729                 if (tz->temperature > tz->last_temperature)
 730                         trend = THERMAL_TREND_RAISING;
 731                 else if (tz->temperature < tz->last_temperature)
 732                         trend = THERMAL_TREND_DROPPING;
 733                 else
 734                         trend = THERMAL_TREND_STABLE;
 735         }
 736
 737         /*
 738          * Above Trip?
 739          * -----------
 740          * Calculate the thermal trend (using the passive cooling equation)
 741          * and modify the performance limit for all passive cooling devices
 742          * accordingly.  Note that we assume symmetry.
 743          */
 744         if (temp >= trip_temp) {
 745                 tz->passive = true;
 746
 747                 /* Heating up? */
 748                 if (trend == THERMAL_TREND_RAISING) {
 749                         list_for_each_entry(instance, &tz->thermal_instances,
 750                                             tz_node) {
 751                                 if (instance->trip != trip)
 752                                         continue;
 753                                 cdev = instance->cdev;
 754                                 cdev->ops->get_cur_state(cdev, &state);
 755                                 cdev->ops->get_max_state(cdev, &max_state);
 756                                 if (state++ < max_state)
 757                                         cdev->ops->set_cur_state(cdev, state);
 758                         }
 759                 } else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */
 760                         list_for_each_entry(instance, &tz->thermal_instances,
 761                                             tz_node) {
 762                                 if (instance->trip != trip)
 763                                         continue;
 764                                 cdev = instance->cdev;
 765                                 cdev->ops->get_cur_state(cdev, &state);
 766                                 cdev->ops->get_max_state(cdev, &max_state);
 767                                 if (state > 0)
 768                                         cdev->ops->set_cur_state(cdev, --state);
 769                         }
 770                 }
 771                 return;
 772         }
 773
 774         /*
 775          * Below Trip?
 776          * -----------
 777          * Implement passive cooling hysteresis to slowly increase performance
 778          * and avoid thrashing around the passive trip point.  Note that we
 779          * assume symmetry.
 780          */
 781         list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
 782                 if (instance->trip != trip)
 783                         continue;
 784                 cdev = instance->cdev;
 785                 cdev->ops->get_cur_state(cdev, &state);
 786                 cdev->ops->get_max_state(cdev, &max_state);
 787                 if (state > 0)
 788                         cdev->ops->set_cur_state(cdev, --state);
 789                 if (state == 0)
 790                         tz->passive = false;
 791         }
 792 }
 793
 794 static void thermal_zone_device_check(struct work_struct *work)
 795 {
 796         struct thermal_zone_device *tz = container_of(work, struct
 797                                                       thermal_zone_device,
 798                                                       poll_queue.work);
 799         thermal_zone_device_update(tz);
 800 }
 801
 802 /**
 803  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 804  * @tz:         thermal zone device
 805  * @trip:       indicates which trip point the cooling devices is
 806  *              associated with in this thermal zone.
 807  * @cdev:       thermal cooling device
 808  *
 809  * This function is usually called in the thermal zone device .bind callback.
 810  */
 811 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 812                                      int trip,
 813                                      struct thermal_cooling_device *cdev,
 814                                      unsigned long upper, unsigned long lower)
 815 {
 816         struct thermal_instance *dev;
 817         struct thermal_instance *pos;
 818         struct thermal_zone_device *pos1;
 819         struct thermal_cooling_device *pos2;
 820         unsigned long max_state;
 821         int result;
 822
 823         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 824                 return -EINVAL;
 825
 826         list_for_each_entry(pos1, &thermal_tz_list, node) {
 827                 if (pos1 == tz)
 828                         break;
 829         }
 830         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 831                 if (pos2 == cdev)
 832                         break;
 833         }
 834
 835         if (tz != pos1 || cdev != pos2)
 836                 return -EINVAL;
 837
 838         cdev->ops->get_max_state(cdev, &max_state);
 839
 840         /* lower default 0, upper default max_state */
 841         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 842         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 843
 844         if (lower > upper || upper > max_state)
 845                 return -EINVAL;
 846
 847         dev =
 848             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 849         if (!dev)
 850                 return -ENOMEM;
 851         dev->tz = tz;
 852         dev->cdev = cdev;
 853         dev->trip = trip;
 854         dev->upper = upper;
 855         dev->lower = lower;
 856
 857         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 858         if (result)
 859                 goto free_mem;
 860
 861         sprintf(dev->name, "cdev%d", dev->id);
 862         result =
 863             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 864         if (result)
 865                 goto release_idr;
 866
 867         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 868         sysfs_attr_init(&dev->attr.attr);
 869         dev->attr.attr.name = dev->attr_name;
 870         dev->attr.attr.mode = 0444;
 871         dev->attr.show = thermal_cooling_device_trip_point_show;
 872         result = device_create_file(&tz->device, &dev->attr);
 873         if (result)
 874                 goto remove_symbol_link;
 875
 876         mutex_lock(&tz->lock);
 877         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 878             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 879                 result = -EEXIST;
 880                 break;
 881         }
 882         if (!result) {
 883                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 884                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 885         }
 886         mutex_unlock(&tz->lock);
 887
 888         if (!result)
 889                 return 0;
 890
 891         device_remove_file(&tz->device, &dev->attr);
 892 remove_symbol_link:
 893         sysfs_remove_link(&tz->device.kobj, dev->name);
 894 release_idr:
 895         release_idr(&tz->idr, &tz->lock, dev->id);
 896 free_mem:
 897         kfree(dev);
 898         return result;
 899 }
 900 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 901
 902 /**
 903  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 904  * @tz:         thermal zone device
 905  * @trip:       indicates which trip point the cooling devices is
 906  *              associated with in this thermal zone.
 907  * @cdev:       thermal cooling device
 908  *
 909  * This function is usually called in the thermal zone device .unbind callback.
 910  */
 911 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 912                                        int trip,
 913                                        struct thermal_cooling_device *cdev)
 914 {
 915         struct thermal_instance *pos, *next;
 916
 917         mutex_lock(&tz->lock);
 918         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 919                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 920                         list_del(&pos->tz_node);
 921                         list_del(&pos->cdev_node);
 922                         mutex_unlock(&tz->lock);
 923                         goto unbind;
 924                 }
 925         }
 926         mutex_unlock(&tz->lock);
 927
 928         return -ENODEV;
 929
 930 unbind:
 931         device_remove_file(&tz->device, &pos->attr);
 932         sysfs_remove_link(&tz->device.kobj, pos->name);
 933         release_idr(&tz->idr, &tz->lock, pos->id);
 934         kfree(pos);
 935         return 0;
 936 }
 937 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 938
 939 static void thermal_release(struct device *dev)
 940 {
 941         struct thermal_zone_device *tz;
 942         struct thermal_cooling_device *cdev;
 943
 944         if (!strncmp(dev_name(dev), "thermal_zone",
 945                      sizeof("thermal_zone") - 1)) {
 946                 tz = to_thermal_zone(dev);
 947                 kfree(tz);
 948         } else {
 949                 cdev = to_cooling_device(dev);
 950                 kfree(cdev);
 951         }
 952 }
 953
 954 static struct class thermal_class = {
 955         .name = "thermal",
 956         .dev_release = thermal_release,
 957 };
 958
 959 /**
 960  * thermal_cooling_device_register - register a new thermal cooling device
 961  * @type:       the thermal cooling device type.
 962  * @devdata:    device private data.
 963  * @ops:                standard thermal cooling devices callbacks.
 964  */
 965 struct thermal_cooling_device *
 966 thermal_cooling_device_register(char *type, void *devdata,
 967                                 const struct thermal_cooling_device_ops *ops)
 968 {
 969         struct thermal_cooling_device *cdev;
 970         struct thermal_zone_device *pos;
 971         int result;
 972
 973         if (strlen(type) >= THERMAL_NAME_LENGTH)
 974                 return ERR_PTR(-EINVAL);
 975
 976         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 977             !ops->set_cur_state)
 978                 return ERR_PTR(-EINVAL);
 979
 980         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 981         if (!cdev)
 982                 return ERR_PTR(-ENOMEM);
 983
 984         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 985         if (result) {
 986                 kfree(cdev);
 987                 return ERR_PTR(result);
 988         }
 989
 990         strcpy(cdev->type, type);
 991         INIT_LIST_HEAD(&cdev->thermal_instances);
 992         cdev->ops = ops;
 993         cdev->device.class = &thermal_class;
 994         cdev->devdata = devdata;
 995         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 996         result = device_register(&cdev->device);
 997         if (result) {
 998                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 999                 kfree(cdev);
1000                 return ERR_PTR(result);
1001         }
1002
1003         /* sys I/F */
1004         if (type) {
1005                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1006                 if (result)
1007                         goto unregister;
1008         }
1009
1010         result = device_create_file(&cdev->device, &dev_attr_max_state);
1011         if (result)
1012                 goto unregister;
1013
1014         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1015         if (result)
1016                 goto unregister;
1017
1018         mutex_lock(&thermal_list_lock);
1019         list_add(&cdev->node, &thermal_cdev_list);
1020         list_for_each_entry(pos, &thermal_tz_list, node) {
1021                 if (!pos->ops->bind)
1022                         continue;
1023                 result = pos->ops->bind(pos, cdev);
1024                 if (result)
1025                         break;
1026
1027         }
1028         mutex_unlock(&thermal_list_lock);
1029
1030         if (!result)
1031                 return cdev;
1032
1033 unregister:
1034         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1035         device_unregister(&cdev->device);
1036         return ERR_PTR(result);
1037 }
1038 EXPORT_SYMBOL(thermal_cooling_device_register);
1039
1040 /**
1041  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1042  * @cdev:       the thermal cooling device to remove.
1043  *
1044  * thermal_cooling_device_unregister() must be called when the device is no
1045  * longer needed.
1046  */
1047 void thermal_cooling_device_unregister(struct
1048                                        thermal_cooling_device
1049                                        *cdev)
1050 {
1051         struct thermal_zone_device *tz;
1052         struct thermal_cooling_device *pos = NULL;
1053
1054         if (!cdev)
1055                 return;
1056
1057         mutex_lock(&thermal_list_lock);
1058         list_for_each_entry(pos, &thermal_cdev_list, node)
1059             if (pos == cdev)
1060                 break;
1061         if (pos != cdev) {
1062                 /* thermal cooling device not found */
1063                 mutex_unlock(&thermal_list_lock);
1064                 return;
1065         }
1066         list_del(&cdev->node);
1067         list_for_each_entry(tz, &thermal_tz_list, node) {
1068                 if (!tz->ops->unbind)
1069                         continue;
1070                 tz->ops->unbind(tz, cdev);
1071         }
1072         mutex_unlock(&thermal_list_lock);
1073         if (cdev->type[0])
1074                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1075         device_remove_file(&cdev->device, &dev_attr_max_state);
1076         device_remove_file(&cdev->device, &dev_attr_cur_state);
1077
1078         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1079         device_unregister(&cdev->device);
1080         return;
1081 }
1082 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1083
1084 /*
1085  * Cooling algorithm for active trip points
1086  *
1087  * 1. if the temperature is higher than a trip point,
1088  *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
1089  *       state for this trip point
1090  *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
1091  *       state for this trip point
1092  *
1093  * 2. if the temperature is lower than a trip point, use lower
1094  *    cooling state for this trip point
1095  *
1096  * Note that this behaves the same as the previous passive cooling
1097  * algorithm.
1098  */
1099
1100 static void thermal_zone_trip_update(struct thermal_zone_device *tz,
1101                                      int trip, long temp)
1102 {
1103         struct thermal_instance *instance;
1104         struct thermal_cooling_device *cdev = NULL;
1105         unsigned long cur_state, max_state;
1106         long trip_temp;
1107         enum thermal_trend trend;
1108
1109         tz->ops->get_trip_temp(tz, trip, &trip_temp);
1110
1111         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
1112                 /*
1113                  * compare the current temperature and previous temperature
1114                  * to get the thermal trend, if no special requirement
1115                  */
1116                 if (tz->temperature > tz->last_temperature)
1117                         trend = THERMAL_TREND_RAISING;
1118                 else if (tz->temperature < tz->last_temperature)
1119                         trend = THERMAL_TREND_DROPPING;
1120                 else
1121                         trend = THERMAL_TREND_STABLE;
1122         }
1123
1124         if (temp >= trip_temp) {
1125                 list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1126                         if (instance->trip != trip)
1127                                 continue;
1128
1129                         cdev = instance->cdev;
1130
1131                         cdev->ops->get_cur_state(cdev, &cur_state);
1132                         cdev->ops->get_max_state(cdev, &max_state);
1133
1134                         if (trend == THERMAL_TREND_RAISING) {
1135                                 cur_state = cur_state < instance->upper ?
1136                                             (cur_state + 1) : instance->upper;
1137                         } else if (trend == THERMAL_TREND_DROPPING) {
1138                                 cur_state = cur_state > instance->lower ?
1139                                     (cur_state - 1) : instance->lower;
1140                         }
1141                         cdev->ops->set_cur_state(cdev, cur_state);
1142                 }
1143         } else {        /* below trip */
1144                 list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1145                         if (instance->trip != trip)
1146                                 continue;
1147
1148                         cdev = instance->cdev;
1149                         cdev->ops->get_cur_state(cdev, &cur_state);
1150
1151                         cur_state = cur_state > instance->lower ?
1152                                     (cur_state - 1) : instance->lower;
1153                         cdev->ops->set_cur_state(cdev, cur_state);
1154                 }
1155         }
1156
1157         return;
1158 }
1159 /**
1160  * thermal_zone_device_update - force an update of a thermal zone's state
1161  * @ttz:        the thermal zone to update
1162  */
1163
1164 void thermal_zone_device_update(struct thermal_zone_device *tz)
1165 {
1166         int count, ret = 0;
1167         long temp, trip_temp;
1168         enum thermal_trip_type trip_type;
1169
1170         mutex_lock(&tz->lock);
1171
1172         if (tz->ops->get_temp(tz, &temp)) {
1173                 /* get_temp failed - retry it later */
1174                 pr_warn("failed to read out thermal zone %d\n", tz->id);
1175                 goto leave;
1176         }
1177
1178         tz->last_temperature = tz->temperature;
1179         tz->temperature = temp;
1180
1181         for (count = 0; count < tz->trips; count++) {
1182                 tz->ops->get_trip_type(tz, count, &trip_type);
1183                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1184
1185                 switch (trip_type) {
1186                 case THERMAL_TRIP_CRITICAL:
1187                         if (temp >= trip_temp) {
1188                                 if (tz->ops->notify)
1189                                         ret = tz->ops->notify(tz, count,
1190                                                               trip_type);
1191                                 if (!ret) {
1192                                         pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1193                                                  temp/1000);
1194                                         orderly_poweroff(true);
1195                                 }
1196                         }
1197                         break;
1198                 case THERMAL_TRIP_HOT:
1199                         if (temp >= trip_temp)
1200                                 if (tz->ops->notify)
1201                                         tz->ops->notify(tz, count, trip_type);
1202                         break;
1203                 case THERMAL_TRIP_ACTIVE:
1204                         thermal_zone_trip_update(tz, count, temp);
1205                         break;
1206                 case THERMAL_TRIP_PASSIVE:
1207                         if (temp >= trip_temp || tz->passive)
1208                                 thermal_zone_device_passive(tz, temp,
1209                                                             trip_temp, count);
1210                         break;
1211                 }
1212         }
1213
1214         if (tz->forced_passive)
1215                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1216                                             THERMAL_TRIPS_NONE);
1217
1218 leave:
1219         if (tz->passive)
1220                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1221         else if (tz->polling_delay)
1222                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1223         else
1224                 thermal_zone_device_set_polling(tz, 0);
1225         mutex_unlock(&tz->lock);
1226 }
1227 EXPORT_SYMBOL(thermal_zone_device_update);
1228
1229 /**
1230  * create_trip_attrs - create attributes for trip points
1231  * @tz:         the thermal zone device
1232  * @mask:       Writeable trip point bitmap.
1233  */
1234 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1235 {
1236         int indx;
1237         int size = sizeof(struct thermal_attr) * tz->trips;
1238
1239         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1240         if (!tz->trip_type_attrs)
1241                 return -ENOMEM;
1242
1243         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1244         if (!tz->trip_temp_attrs) {
1245                 kfree(tz->trip_type_attrs);
1246                 return -ENOMEM;
1247         }
1248
1249         if (tz->ops->get_trip_hyst) {
1250                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1251                 if (!tz->trip_hyst_attrs) {
1252                         kfree(tz->trip_type_attrs);
1253                         kfree(tz->trip_temp_attrs);
1254                         return -ENOMEM;
1255                 }
1256         }
1257
1258
1259         for (indx = 0; indx < tz->trips; indx++) {
1260                 /* create trip type attribute */
1261                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1262                          "trip_point_%d_type", indx);
1263
1264                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1265                 tz->trip_type_attrs[indx].attr.attr.name =
1266                                                 tz->trip_type_attrs[indx].name;
1267                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1268                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1269
1270                 device_create_file(&tz->device,
1271                                    &tz->trip_type_attrs[indx].attr);
1272
1273                 /* create trip temp attribute */
1274                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1275                          "trip_point_%d_temp", indx);
1276
1277                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1278                 tz->trip_temp_attrs[indx].attr.attr.name =
1279                                                 tz->trip_temp_attrs[indx].name;
1280                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1281                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1282                 if (mask & (1 << indx)) {
1283                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1284                         tz->trip_temp_attrs[indx].attr.store =
1285                                                         trip_point_temp_store;
1286                 }
1287
1288                 device_create_file(&tz->device,
1289                                    &tz->trip_temp_attrs[indx].attr);
1290
1291                 /* create Optional trip hyst attribute */
1292                 if (!tz->ops->get_trip_hyst)
1293                         continue;
1294                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1295                          "trip_point_%d_hyst", indx);
1296
1297                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1298                 tz->trip_hyst_attrs[indx].attr.attr.name =
1299                                         tz->trip_hyst_attrs[indx].name;
1300                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1301                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1302                 if (tz->ops->set_trip_hyst) {
1303                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1304                         tz->trip_hyst_attrs[indx].attr.store =
1305                                         trip_point_hyst_store;
1306                 }
1307
1308                 device_create_file(&tz->device,
1309                                    &tz->trip_hyst_attrs[indx].attr);
1310         }
1311         return 0;
1312 }
1313
1314 static void remove_trip_attrs(struct thermal_zone_device *tz)
1315 {
1316         int indx;
1317
1318         for (indx = 0; indx < tz->trips; indx++) {
1319                 device_remove_file(&tz->device,
1320                                    &tz->trip_type_attrs[indx].attr);
1321                 device_remove_file(&tz->device,
1322                                    &tz->trip_temp_attrs[indx].attr);
1323                 if (tz->ops->get_trip_hyst)
1324                         device_remove_file(&tz->device,
1325                                   &tz->trip_hyst_attrs[indx].attr);
1326         }
1327         kfree(tz->trip_type_attrs);
1328         kfree(tz->trip_temp_attrs);
1329         kfree(tz->trip_hyst_attrs);
1330 }
1331
1332 /**
1333  * thermal_zone_device_register - register a new thermal zone device
1334  * @type:       the thermal zone device type
1335  * @trips:      the number of trip points the thermal zone support
1336  * @mask:       a bit string indicating the writeablility of trip points
1337  * @devdata:    private device data
1338  * @ops:        standard thermal zone device callbacks
1339  * @passive_delay: number of milliseconds to wait between polls when
1340  *                 performing passive cooling
1341  * @polling_delay: number of milliseconds to wait between polls when checking
1342  *                 whether trip points have been crossed (0 for interrupt
1343  *                 driven systems)
1344  *
1345  * thermal_zone_device_unregister() must be called when the device is no
1346  * longer needed. The passive cooling depends on the .get_trend() return value.
1347  */
1348 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1349         int trips, int mask, void *devdata,
1350         const struct thermal_zone_device_ops *ops,
1351         int passive_delay, int polling_delay)
1352 {
1353         struct thermal_zone_device *tz;
1354         struct thermal_cooling_device *pos;
1355         enum thermal_trip_type trip_type;
1356         int result;
1357         int count;
1358         int passive = 0;
1359
1360         if (strlen(type) >= THERMAL_NAME_LENGTH)
1361                 return ERR_PTR(-EINVAL);
1362
1363         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1364                 return ERR_PTR(-EINVAL);
1365
1366         if (!ops || !ops->get_temp)
1367                 return ERR_PTR(-EINVAL);
1368
1369         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1370         if (!tz)
1371                 return ERR_PTR(-ENOMEM);
1372
1373         INIT_LIST_HEAD(&tz->thermal_instances);
1374         idr_init(&tz->idr);
1375         mutex_init(&tz->lock);
1376         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1377         if (result) {
1378                 kfree(tz);
1379                 return ERR_PTR(result);
1380         }
1381
1382         strcpy(tz->type, type);
1383         tz->ops = ops;
1384         tz->device.class = &thermal_class;
1385         tz->devdata = devdata;
1386         tz->trips = trips;
1387         tz->passive_delay = passive_delay;
1388         tz->polling_delay = polling_delay;
1389
1390         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1391         result = device_register(&tz->device);
1392         if (result) {
1393                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1394                 kfree(tz);
1395                 return ERR_PTR(result);
1396         }
1397
1398         /* sys I/F */
1399         if (type) {
1400                 result = device_create_file(&tz->device, &dev_attr_type);
1401                 if (result)
1402                         goto unregister;
1403         }
1404
1405         result = device_create_file(&tz->device, &dev_attr_temp);
1406         if (result)
1407                 goto unregister;
1408
1409         if (ops->get_mode) {
1410                 result = device_create_file(&tz->device, &dev_attr_mode);
1411                 if (result)
1412                         goto unregister;
1413         }
1414
1415         result = create_trip_attrs(tz, mask);
1416         if (result)
1417                 goto unregister;
1418
1419         for (count = 0; count < trips; count++) {
1420                 tz->ops->get_trip_type(tz, count, &trip_type);
1421                 if (trip_type == THERMAL_TRIP_PASSIVE)
1422                         passive = 1;
1423         }
1424
1425         if (!passive)
1426                 result = device_create_file(&tz->device,
1427                                             &dev_attr_passive);
1428
1429         if (result)
1430                 goto unregister;
1431
1432         result = thermal_add_hwmon_sysfs(tz);
1433         if (result)
1434                 goto unregister;
1435
1436         mutex_lock(&thermal_list_lock);
1437         list_add_tail(&tz->node, &thermal_tz_list);
1438         if (ops->bind)
1439                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1440                 result = ops->bind(tz, pos);
1441                 if (result)
1442                         break;
1443                 }
1444         mutex_unlock(&thermal_list_lock);
1445
1446         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1447
1448         thermal_zone_device_update(tz);
1449
1450         if (!result)
1451                 return tz;
1452
1453 unregister:
1454         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1455         device_unregister(&tz->device);
1456         return ERR_PTR(result);
1457 }
1458 EXPORT_SYMBOL(thermal_zone_device_register);
1459
1460 /**
1461  * thermal_device_unregister - removes the registered thermal zone device
1462  * @tz: the thermal zone device to remove
1463  */
1464 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1465 {
1466         struct thermal_cooling_device *cdev;
1467         struct thermal_zone_device *pos = NULL;
1468
1469         if (!tz)
1470                 return;
1471
1472         mutex_lock(&thermal_list_lock);
1473         list_for_each_entry(pos, &thermal_tz_list, node)
1474             if (pos == tz)
1475                 break;
1476         if (pos != tz) {
1477                 /* thermal zone device not found */
1478                 mutex_unlock(&thermal_list_lock);
1479                 return;
1480         }
1481         list_del(&tz->node);
1482         if (tz->ops->unbind)
1483                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1484                     tz->ops->unbind(tz, cdev);
1485         mutex_unlock(&thermal_list_lock);
1486
1487         thermal_zone_device_set_polling(tz, 0);
1488
1489         if (tz->type[0])
1490                 device_remove_file(&tz->device, &dev_attr_type);
1491         device_remove_file(&tz->device, &dev_attr_temp);
1492         if (tz->ops->get_mode)
1493                 device_remove_file(&tz->device, &dev_attr_mode);
1494         remove_trip_attrs(tz);
1495
1496         thermal_remove_hwmon_sysfs(tz);
1497         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1498         idr_destroy(&tz->idr);
1499         mutex_destroy(&tz->lock);
1500         device_unregister(&tz->device);
1501         return;
1502 }
1503 EXPORT_SYMBOL(thermal_zone_device_unregister);
1504
1505 #ifdef CONFIG_NET
1506 static struct genl_family thermal_event_genl_family = {
1507         .id = GENL_ID_GENERATE,
1508         .name = THERMAL_GENL_FAMILY_NAME,
1509         .version = THERMAL_GENL_VERSION,
1510         .maxattr = THERMAL_GENL_ATTR_MAX,
1511 };
1512
1513 static struct genl_multicast_group thermal_event_mcgrp = {
1514         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1515 };
1516
1517 int thermal_generate_netlink_event(u32 orig, enum events event)
1518 {
1519         struct sk_buff *skb;
1520         struct nlattr *attr;
1521         struct thermal_genl_event *thermal_event;
1522         void *msg_header;
1523         int size;
1524         int result;
1525         static unsigned int thermal_event_seqnum;
1526
1527         /* allocate memory */
1528         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1529                nla_total_size(0);
1530
1531         skb = genlmsg_new(size, GFP_ATOMIC);
1532         if (!skb)
1533                 return -ENOMEM;
1534
1535         /* add the genetlink message header */
1536         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1537                                  &thermal_event_genl_family, 0,
1538                                  THERMAL_GENL_CMD_EVENT);
1539         if (!msg_header) {
1540                 nlmsg_free(skb);
1541                 return -ENOMEM;
1542         }
1543
1544         /* fill the data */
1545         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1546                            sizeof(struct thermal_genl_event));
1547
1548         if (!attr) {
1549                 nlmsg_free(skb);
1550                 return -EINVAL;
1551         }
1552
1553         thermal_event = nla_data(attr);
1554         if (!thermal_event) {
1555                 nlmsg_free(skb);
1556                 return -EINVAL;
1557         }
1558
1559         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1560
1561         thermal_event->orig = orig;
1562         thermal_event->event = event;
1563
1564         /* send multicast genetlink message */
1565         result = genlmsg_end(skb, msg_header);
1566         if (result < 0) {
1567                 nlmsg_free(skb);
1568                 return result;
1569         }
1570
1571         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1572         if (result)
1573                 pr_info("failed to send netlink event:%d\n", result);
1574
1575         return result;
1576 }
1577 EXPORT_SYMBOL(thermal_generate_netlink_event);
1578
1579 static int genetlink_init(void)
1580 {
1581         int result;
1582
1583         result = genl_register_family(&thermal_event_genl_family);
1584         if (result)
1585                 return result;
1586
1587         result = genl_register_mc_group(&thermal_event_genl_family,
1588                                         &thermal_event_mcgrp);
1589         if (result)
1590                 genl_unregister_family(&thermal_event_genl_family);
1591         return result;
1592 }
1593
1594 static void genetlink_exit(void)
1595 {
1596         genl_unregister_family(&thermal_event_genl_family);
1597 }
1598 #else /* !CONFIG_NET */
1599 static inline int genetlink_init(void) { return 0; }
1600 static inline void genetlink_exit(void) {}
1601 #endif /* !CONFIG_NET */
1602
1603 static int __init thermal_init(void)
1604 {
1605         int result = 0;
1606
1607         result = class_register(&thermal_class);
1608         if (result) {
1609                 idr_destroy(&thermal_tz_idr);
1610                 idr_destroy(&thermal_cdev_idr);
1611                 mutex_destroy(&thermal_idr_lock);
1612                 mutex_destroy(&thermal_list_lock);
1613         }
1614         result = genetlink_init();
1615         return result;
1616 }
1617
1618 static void __exit thermal_exit(void)
1619 {
1620         class_unregister(&thermal_class);
1621         idr_destroy(&thermal_tz_idr);
1622         idr_destroy(&thermal_cdev_idr);
1623         mutex_destroy(&thermal_idr_lock);
1624         mutex_destroy(&thermal_list_lock);
1625         genetlink_exit();
1626 }
1627
1628 fs_initcall(thermal_init);
1629 module_exit(thermal_exit);