drivers/thermal/thermal_core.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/reboot.h>
  36 #include <linux/string.h>
  37 #include <linux/of.h>
  38 #include <net/netlink.h>
  39 #include <net/genetlink.h>
  40
  41 #define CREATE_TRACE_POINTS
  42 #include <trace/events/thermal.h>
  43
  44 #include "thermal_core.h"
  45 #include "thermal_hwmon.h"
  46
  47 MODULE_AUTHOR("Zhang Rui");
  48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  49 MODULE_LICENSE("GPL v2");
  50
  51 static DEFINE_IDR(thermal_tz_idr);
  52 static DEFINE_IDR(thermal_cdev_idr);
  53 static DEFINE_MUTEX(thermal_idr_lock);
  54
  55 static LIST_HEAD(thermal_tz_list);
  56 static LIST_HEAD(thermal_cdev_list);
  57 static LIST_HEAD(thermal_governor_list);
  58
  59 static DEFINE_MUTEX(thermal_list_lock);
  60 static DEFINE_MUTEX(thermal_governor_lock);
  61
  62 static struct thermal_governor *def_governor;
  63
  64 static struct thermal_governor *__find_governor(const char *name)
  65 {
  66         struct thermal_governor *pos;
  67
  68         if (!name || !name[0])
  69                 return def_governor;
  70
  71         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  72                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  73                         return pos;
  74
  75         return NULL;
  76 }
  77
  78 /**
  79  * bind_previous_governor() - bind the previous governor of the thermal zone
  80  * @tz:         a valid pointer to a struct thermal_zone_device
  81  * @failed_gov_name:    the name of the governor that failed to register
  82  *
  83  * Register the previous governor of the thermal zone after a new
  84  * governor has failed to be bound.
  85  */
  86 static void bind_previous_governor(struct thermal_zone_device *tz,
  87                                    const char *failed_gov_name)
  88 {
  89         if (tz->governor && tz->governor->bind_to_tz) {
  90                 if (tz->governor->bind_to_tz(tz)) {
  91                         dev_err(&tz->device,
  92                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  93                                 failed_gov_name, tz->governor->name, tz->type);
  94                         tz->governor = NULL;
  95                 }
  96         }
  97 }
  98
  99 /**
 100  * thermal_set_governor() - Switch to another governor
 101  * @tz:         a valid pointer to a struct thermal_zone_device
 102  * @new_gov:    pointer to the new governor
 103  *
 104  * Change the governor of thermal zone @tz.
 105  *
 106  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
 107  */
 108 static int thermal_set_governor(struct thermal_zone_device *tz,
 109                                 struct thermal_governor *new_gov)
 110 {
 111         int ret = 0;
 112
 113         if (tz->governor && tz->governor->unbind_from_tz)
 114                 tz->governor->unbind_from_tz(tz);
 115
 116         if (new_gov && new_gov->bind_to_tz) {
 117                 ret = new_gov->bind_to_tz(tz);
 118                 if (ret) {
 119                         bind_previous_governor(tz, new_gov->name);
 120
 121                         return ret;
 122                 }
 123         }
 124
 125         tz->governor = new_gov;
 126
 127         return ret;
 128 }
 129
 130 int thermal_register_governor(struct thermal_governor *governor)
 131 {
 132         int err;
 133         const char *name;
 134         struct thermal_zone_device *pos;
 135
 136         if (!governor)
 137                 return -EINVAL;
 138
 139         mutex_lock(&thermal_governor_lock);
 140
 141         err = -EBUSY;
 142         if (__find_governor(governor->name) == NULL) {
 143                 err = 0;
 144                 list_add(&governor->governor_list, &thermal_governor_list);
 145                 if (!def_governor && !strncmp(governor->name,
 146                         DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
 147                         def_governor = governor;
 148         }
 149
 150         mutex_lock(&thermal_list_lock);
 151
 152         list_for_each_entry(pos, &thermal_tz_list, node) {
 153                 /*
 154                  * only thermal zones with specified tz->tzp->governor_name
 155                  * may run with tz->govenor unset
 156                  */
 157                 if (pos->governor)
 158                         continue;
 159
 160                 name = pos->tzp->governor_name;
 161
 162                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 163                         int ret;
 164
 165                         ret = thermal_set_governor(pos, governor);
 166                         if (ret)
 167                                 dev_err(&pos->device,
 168                                         "Failed to set governor %s for thermal zone %s: %d\n",
 169                                         governor->name, pos->type, ret);
 170                 }
 171         }
 172
 173         mutex_unlock(&thermal_list_lock);
 174         mutex_unlock(&thermal_governor_lock);
 175
 176         return err;
 177 }
 178
 179 void thermal_unregister_governor(struct thermal_governor *governor)
 180 {
 181         struct thermal_zone_device *pos;
 182
 183         if (!governor)
 184                 return;
 185
 186         mutex_lock(&thermal_governor_lock);
 187
 188         if (__find_governor(governor->name) == NULL)
 189                 goto exit;
 190
 191         mutex_lock(&thermal_list_lock);
 192
 193         list_for_each_entry(pos, &thermal_tz_list, node) {
 194                 if (!strncasecmp(pos->governor->name, governor->name,
 195                                                 THERMAL_NAME_LENGTH))
 196                         thermal_set_governor(pos, NULL);
 197         }
 198
 199         mutex_unlock(&thermal_list_lock);
 200         list_del(&governor->governor_list);
 201 exit:
 202         mutex_unlock(&thermal_governor_lock);
 203         return;
 204 }
 205
 206 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 207 {
 208         int ret;
 209
 210         if (lock)
 211                 mutex_lock(lock);
 212         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 213         if (lock)
 214                 mutex_unlock(lock);
 215         if (unlikely(ret < 0))
 216                 return ret;
 217         *id = ret;
 218         return 0;
 219 }
 220
 221 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 222 {
 223         if (lock)
 224                 mutex_lock(lock);
 225         idr_remove(idr, id);
 226         if (lock)
 227                 mutex_unlock(lock);
 228 }
 229
 230 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 231 {
 232         enum thermal_trend trend;
 233
 234         if (tz->emul_temperature || !tz->ops->get_trend ||
 235             tz->ops->get_trend(tz, trip, &trend)) {
 236                 if (tz->temperature > tz->last_temperature)
 237                         trend = THERMAL_TREND_RAISING;
 238                 else if (tz->temperature < tz->last_temperature)
 239                         trend = THERMAL_TREND_DROPPING;
 240                 else
 241                         trend = THERMAL_TREND_STABLE;
 242         }
 243
 244         return trend;
 245 }
 246 EXPORT_SYMBOL(get_tz_trend);
 247
 248 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 249                         struct thermal_cooling_device *cdev, int trip)
 250 {
 251         struct thermal_instance *pos = NULL;
 252         struct thermal_instance *target_instance = NULL;
 253
 254         mutex_lock(&tz->lock);
 255         mutex_lock(&cdev->lock);
 256
 257         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 258                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 259                         target_instance = pos;
 260                         break;
 261                 }
 262         }
 263
 264         mutex_unlock(&cdev->lock);
 265         mutex_unlock(&tz->lock);
 266
 267         return target_instance;
 268 }
 269 EXPORT_SYMBOL(get_thermal_instance);
 270
 271 static void print_bind_err_msg(struct thermal_zone_device *tz,
 272                         struct thermal_cooling_device *cdev, int ret)
 273 {
 274         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 275                                 tz->type, cdev->type, ret);
 276 }
 277
 278 static void __bind(struct thermal_zone_device *tz, int mask,
 279                         struct thermal_cooling_device *cdev,
 280                         unsigned long *limits,
 281                         unsigned int weight)
 282 {
 283         int i, ret;
 284
 285         for (i = 0; i < tz->trips; i++) {
 286                 if (mask & (1 << i)) {
 287                         unsigned long upper, lower;
 288
 289                         upper = THERMAL_NO_LIMIT;
 290                         lower = THERMAL_NO_LIMIT;
 291                         if (limits) {
 292                                 lower = limits[i * 2];
 293                                 upper = limits[i * 2 + 1];
 294                         }
 295                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 296                                                                upper, lower,
 297                                                                weight);
 298                         if (ret)
 299                                 print_bind_err_msg(tz, cdev, ret);
 300                 }
 301         }
 302 }
 303
 304 static void __unbind(struct thermal_zone_device *tz, int mask,
 305                         struct thermal_cooling_device *cdev)
 306 {
 307         int i;
 308
 309         for (i = 0; i < tz->trips; i++)
 310                 if (mask & (1 << i))
 311                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 312 }
 313
 314 static void bind_cdev(struct thermal_cooling_device *cdev)
 315 {
 316         int i, ret;
 317         const struct thermal_zone_params *tzp;
 318         struct thermal_zone_device *pos = NULL;
 319
 320         mutex_lock(&thermal_list_lock);
 321
 322         list_for_each_entry(pos, &thermal_tz_list, node) {
 323                 if (!pos->tzp && !pos->ops->bind)
 324                         continue;
 325
 326                 if (pos->ops->bind) {
 327                         ret = pos->ops->bind(pos, cdev);
 328                         if (ret)
 329                                 print_bind_err_msg(pos, cdev, ret);
 330                         continue;
 331                 }
 332
 333                 tzp = pos->tzp;
 334                 if (!tzp || !tzp->tbp)
 335                         continue;
 336
 337                 for (i = 0; i < tzp->num_tbps; i++) {
 338                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 339                                 continue;
 340                         if (tzp->tbp[i].match(pos, cdev))
 341                                 continue;
 342                         tzp->tbp[i].cdev = cdev;
 343                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 344                                tzp->tbp[i].binding_limits,
 345                                tzp->tbp[i].weight);
 346                 }
 347         }
 348
 349         mutex_unlock(&thermal_list_lock);
 350 }
 351
 352 static void bind_tz(struct thermal_zone_device *tz)
 353 {
 354         int i, ret;
 355         struct thermal_cooling_device *pos = NULL;
 356         const struct thermal_zone_params *tzp = tz->tzp;
 357
 358         if (!tzp && !tz->ops->bind)
 359                 return;
 360
 361         mutex_lock(&thermal_list_lock);
 362
 363         /* If there is ops->bind, try to use ops->bind */
 364         if (tz->ops->bind) {
 365                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 366                         ret = tz->ops->bind(tz, pos);
 367                         if (ret)
 368                                 print_bind_err_msg(tz, pos, ret);
 369                 }
 370                 goto exit;
 371         }
 372
 373         if (!tzp || !tzp->tbp)
 374                 goto exit;
 375
 376         list_for_each_entry(pos, &thermal_cdev_list, node) {
 377                 for (i = 0; i < tzp->num_tbps; i++) {
 378                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 379                                 continue;
 380                         if (tzp->tbp[i].match(tz, pos))
 381                                 continue;
 382                         tzp->tbp[i].cdev = pos;
 383                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 384                                tzp->tbp[i].binding_limits,
 385                                tzp->tbp[i].weight);
 386                 }
 387         }
 388 exit:
 389         mutex_unlock(&thermal_list_lock);
 390 }
 391
 392 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 393                                             int delay)
 394 {
 395         if (delay > 1000)
 396                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 397                                  round_jiffies(msecs_to_jiffies(delay)));
 398         else if (delay)
 399                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 400                                  msecs_to_jiffies(delay));
 401         else
 402                 cancel_delayed_work(&tz->poll_queue);
 403 }
 404
 405 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 406 {
 407         mutex_lock(&tz->lock);
 408
 409         if (tz->passive)
 410                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 411         else if (tz->polling_delay)
 412                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 413         else
 414                 thermal_zone_device_set_polling(tz, 0);
 415
 416         mutex_unlock(&tz->lock);
 417 }
 418
 419 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 420                         int trip, enum thermal_trip_type trip_type)
 421 {
 422         tz->governor ? tz->governor->throttle(tz, trip) :
 423                        def_governor->throttle(tz, trip);
 424 }
 425
 426 static void handle_critical_trips(struct thermal_zone_device *tz,
 427                                 int trip, enum thermal_trip_type trip_type)
 428 {
 429         long trip_temp;
 430
 431         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 432
 433         /* If we have not crossed the trip_temp, we do not care. */
 434         if (trip_temp <= 0 || tz->temperature < trip_temp)
 435                 return;
 436
 437         trace_thermal_zone_trip(tz, trip, trip_type);
 438
 439         if (tz->ops->notify)
 440                 tz->ops->notify(tz, trip, trip_type);
 441
 442         if (trip_type == THERMAL_TRIP_CRITICAL) {
 443                 dev_emerg(&tz->device,
 444                           "critical temperature reached(%d C),shutting down\n",
 445                           tz->temperature / 1000);
 446                 orderly_poweroff(true);
 447         }
 448 }
 449
 450 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 451 {
 452         enum thermal_trip_type type;
 453
 454         tz->ops->get_trip_type(tz, trip, &type);
 455
 456         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 457                 handle_critical_trips(tz, trip, type);
 458         else
 459                 handle_non_critical_trips(tz, trip, type);
 460         /*
 461          * Alright, we handled this trip successfully.
 462          * So, start monitoring again.
 463          */
 464         monitor_thermal_zone(tz);
 465 }
 466
 467 /**
 468  * thermal_zone_get_temp() - returns its the temperature of thermal zone
 469  * @tz: a valid pointer to a struct thermal_zone_device
 470  * @temp: a valid pointer to where to store the resulting temperature.
 471  *
 472  * When a valid thermal zone reference is passed, it will fetch its
 473  * temperature and fill @temp.
 474  *
 475  * Return: On success returns 0, an error code otherwise
 476  */
 477 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 478 {
 479         int ret = -EINVAL;
 480 #ifdef CONFIG_THERMAL_EMULATION
 481         int count;
 482         unsigned long crit_temp = -1UL;
 483         enum thermal_trip_type type;
 484 #endif
 485
 486         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 487                 goto exit;
 488
 489         mutex_lock(&tz->lock);
 490
 491         ret = tz->ops->get_temp(tz, temp);
 492 #ifdef CONFIG_THERMAL_EMULATION
 493         if (!tz->emul_temperature)
 494                 goto skip_emul;
 495
 496         for (count = 0; count < tz->trips; count++) {
 497                 ret = tz->ops->get_trip_type(tz, count, &type);
 498                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 499                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 500                         break;
 501                 }
 502         }
 503
 504         if (ret)
 505                 goto skip_emul;
 506
 507         if (*temp < crit_temp)
 508                 *temp = tz->emul_temperature;
 509 skip_emul:
 510 #endif
 511         mutex_unlock(&tz->lock);
 512 exit:
 513         return ret;
 514 }
 515 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 516
 517 static void update_temperature(struct thermal_zone_device *tz)
 518 {
 519         long temp;
 520         int ret;
 521
 522         ret = thermal_zone_get_temp(tz, &temp);
 523         if (ret) {
 524                 if (ret != -EAGAIN)
 525                         dev_warn(&tz->device,
 526                                  "failed to read out thermal zone (%d)\n",
 527                                  ret);
 528                 return;
 529         }
 530
 531         mutex_lock(&tz->lock);
 532         tz->last_temperature = tz->temperature;
 533         tz->temperature = temp;
 534         mutex_unlock(&tz->lock);
 535
 536         trace_thermal_temperature(tz);
 537         dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 538                                 tz->last_temperature, tz->temperature);
 539 }
 540
 541 void thermal_zone_device_update(struct thermal_zone_device *tz)
 542 {
 543         int count;
 544
 545         if (!tz->ops->get_temp)
 546                 return;
 547
 548         update_temperature(tz);
 549
 550         for (count = 0; count < tz->trips; count++)
 551                 handle_thermal_trip(tz, count);
 552 }
 553 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 554
 555 static void thermal_zone_device_check(struct work_struct *work)
 556 {
 557         struct thermal_zone_device *tz = container_of(work, struct
 558                                                       thermal_zone_device,
 559                                                       poll_queue.work);
 560         thermal_zone_device_update(tz);
 561 }
 562
 563 /* sys I/F for thermal zone */
 564
 565 #define to_thermal_zone(_dev) \
 566         container_of(_dev, struct thermal_zone_device, device)
 567
 568 static ssize_t
 569 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 570 {
 571         struct thermal_zone_device *tz = to_thermal_zone(dev);
 572
 573         return sprintf(buf, "%s\n", tz->type);
 574 }
 575
 576 static ssize_t
 577 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 578 {
 579         struct thermal_zone_device *tz = to_thermal_zone(dev);
 580         long temperature;
 581         int ret;
 582
 583         ret = thermal_zone_get_temp(tz, &temperature);
 584
 585         if (ret)
 586                 return ret;
 587
 588         return sprintf(buf, "%ld\n", temperature);
 589 }
 590
 591 static ssize_t
 592 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 593 {
 594         struct thermal_zone_device *tz = to_thermal_zone(dev);
 595         enum thermal_device_mode mode;
 596         int result;
 597
 598         if (!tz->ops->get_mode)
 599                 return -EPERM;
 600
 601         result = tz->ops->get_mode(tz, &mode);
 602         if (result)
 603                 return result;
 604
 605         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 606                        : "disabled");
 607 }
 608
 609 static ssize_t
 610 mode_store(struct device *dev, struct device_attribute *attr,
 611            const char *buf, size_t count)
 612 {
 613         struct thermal_zone_device *tz = to_thermal_zone(dev);
 614         int result;
 615
 616         if (!tz->ops->set_mode)
 617                 return -EPERM;
 618
 619         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 620                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 621         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 622                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 623         else
 624                 result = -EINVAL;
 625
 626         if (result)
 627                 return result;
 628
 629         return count;
 630 }
 631
 632 static ssize_t
 633 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 634                      char *buf)
 635 {
 636         struct thermal_zone_device *tz = to_thermal_zone(dev);
 637         enum thermal_trip_type type;
 638         int trip, result;
 639
 640         if (!tz->ops->get_trip_type)
 641                 return -EPERM;
 642
 643         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 644                 return -EINVAL;
 645
 646         result = tz->ops->get_trip_type(tz, trip, &type);
 647         if (result)
 648                 return result;
 649
 650         switch (type) {
 651         case THERMAL_TRIP_CRITICAL:
 652                 return sprintf(buf, "critical\n");
 653         case THERMAL_TRIP_HOT:
 654                 return sprintf(buf, "hot\n");
 655         case THERMAL_TRIP_PASSIVE:
 656                 return sprintf(buf, "passive\n");
 657         case THERMAL_TRIP_ACTIVE:
 658                 return sprintf(buf, "active\n");
 659         default:
 660                 return sprintf(buf, "unknown\n");
 661         }
 662 }
 663
 664 static ssize_t
 665 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 666                      const char *buf, size_t count)
 667 {
 668         struct thermal_zone_device *tz = to_thermal_zone(dev);
 669         int trip, ret;
 670         unsigned long temperature;
 671
 672         if (!tz->ops->set_trip_temp)
 673                 return -EPERM;
 674
 675         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 676                 return -EINVAL;
 677
 678         if (kstrtoul(buf, 10, &temperature))
 679                 return -EINVAL;
 680
 681         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 682
 683         return ret ? ret : count;
 684 }
 685
 686 static ssize_t
 687 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 688                      char *buf)
 689 {
 690         struct thermal_zone_device *tz = to_thermal_zone(dev);
 691         int trip, ret;
 692         long temperature;
 693
 694         if (!tz->ops->get_trip_temp)
 695                 return -EPERM;
 696
 697         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 698                 return -EINVAL;
 699
 700         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 701
 702         if (ret)
 703                 return ret;
 704
 705         return sprintf(buf, "%ld\n", temperature);
 706 }
 707
 708 static ssize_t
 709 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 710                         const char *buf, size_t count)
 711 {
 712         struct thermal_zone_device *tz = to_thermal_zone(dev);
 713         int trip, ret;
 714         unsigned long temperature;
 715
 716         if (!tz->ops->set_trip_hyst)
 717                 return -EPERM;
 718
 719         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 720                 return -EINVAL;
 721
 722         if (kstrtoul(buf, 10, &temperature))
 723                 return -EINVAL;
 724
 725         /*
 726          * We are not doing any check on the 'temperature' value
 727          * here. The driver implementing 'set_trip_hyst' has to
 728          * take care of this.
 729          */
 730         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 731
 732         return ret ? ret : count;
 733 }
 734
 735 static ssize_t
 736 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 737                         char *buf)
 738 {
 739         struct thermal_zone_device *tz = to_thermal_zone(dev);
 740         int trip, ret;
 741         unsigned long temperature;
 742
 743         if (!tz->ops->get_trip_hyst)
 744                 return -EPERM;
 745
 746         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 747                 return -EINVAL;
 748
 749         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 750
 751         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 752 }
 753
 754 static ssize_t
 755 passive_store(struct device *dev, struct device_attribute *attr,
 756                     const char *buf, size_t count)
 757 {
 758         struct thermal_zone_device *tz = to_thermal_zone(dev);
 759         struct thermal_cooling_device *cdev = NULL;
 760         int state;
 761
 762         if (!sscanf(buf, "%d\n", &state))
 763                 return -EINVAL;
 764
 765         /* sanity check: values below 1000 millicelcius don't make sense
 766          * and can cause the system to go into a thermal heart attack
 767          */
 768         if (state && state < 1000)
 769                 return -EINVAL;
 770
 771         if (state && !tz->forced_passive) {
 772                 mutex_lock(&thermal_list_lock);
 773                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 774                         if (!strncmp("Processor", cdev->type,
 775                                      sizeof("Processor")))
 776                                 thermal_zone_bind_cooling_device(tz,
 777                                                 THERMAL_TRIPS_NONE, cdev,
 778                                                 THERMAL_NO_LIMIT,
 779                                                 THERMAL_NO_LIMIT,
 780                                                 THERMAL_WEIGHT_DEFAULT);
 781                 }
 782                 mutex_unlock(&thermal_list_lock);
 783                 if (!tz->passive_delay)
 784                         tz->passive_delay = 1000;
 785         } else if (!state && tz->forced_passive) {
 786                 mutex_lock(&thermal_list_lock);
 787                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 788                         if (!strncmp("Processor", cdev->type,
 789                                      sizeof("Processor")))
 790                                 thermal_zone_unbind_cooling_device(tz,
 791                                                                    THERMAL_TRIPS_NONE,
 792                                                                    cdev);
 793                 }
 794                 mutex_unlock(&thermal_list_lock);
 795                 tz->passive_delay = 0;
 796         }
 797
 798         tz->forced_passive = state;
 799
 800         thermal_zone_device_update(tz);
 801
 802         return count;
 803 }
 804
 805 static ssize_t
 806 passive_show(struct device *dev, struct device_attribute *attr,
 807                    char *buf)
 808 {
 809         struct thermal_zone_device *tz = to_thermal_zone(dev);
 810
 811         return sprintf(buf, "%d\n", tz->forced_passive);
 812 }
 813
 814 static ssize_t
 815 policy_store(struct device *dev, struct device_attribute *attr,
 816                     const char *buf, size_t count)
 817 {
 818         int ret = -EINVAL;
 819         struct thermal_zone_device *tz = to_thermal_zone(dev);
 820         struct thermal_governor *gov;
 821         char name[THERMAL_NAME_LENGTH];
 822
 823         snprintf(name, sizeof(name), "%s", buf);
 824
 825         mutex_lock(&thermal_governor_lock);
 826         mutex_lock(&tz->lock);
 827
 828         gov = __find_governor(strim(name));
 829         if (!gov)
 830                 goto exit;
 831
 832         ret = thermal_set_governor(tz, gov);
 833         if (!ret)
 834                 ret = count;
 835
 836 exit:
 837         mutex_unlock(&tz->lock);
 838         mutex_unlock(&thermal_governor_lock);
 839         return ret;
 840 }
 841
 842 static ssize_t
 843 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 844 {
 845         struct thermal_zone_device *tz = to_thermal_zone(dev);
 846
 847         return sprintf(buf, "%s\n", tz->governor->name);
 848 }
 849
 850 #ifdef CONFIG_THERMAL_EMULATION
 851 static ssize_t
 852 emul_temp_store(struct device *dev, struct device_attribute *attr,
 853                      const char *buf, size_t count)
 854 {
 855         struct thermal_zone_device *tz = to_thermal_zone(dev);
 856         int ret = 0;
 857         unsigned long temperature;
 858
 859         if (kstrtoul(buf, 10, &temperature))
 860                 return -EINVAL;
 861
 862         if (!tz->ops->set_emul_temp) {
 863                 mutex_lock(&tz->lock);
 864                 tz->emul_temperature = temperature;
 865                 mutex_unlock(&tz->lock);
 866         } else {
 867                 ret = tz->ops->set_emul_temp(tz, temperature);
 868         }
 869
 870         if (!ret)
 871                 thermal_zone_device_update(tz);
 872
 873         return ret ? ret : count;
 874 }
 875 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 876 #endif/*CONFIG_THERMAL_EMULATION*/
 877
 878 /**
 879  * power_actor_get_max_power() - get the maximum power that a cdev can consume
 880  * @cdev:       pointer to &thermal_cooling_device
 881  * @tz:         a valid thermal zone device pointer
 882  * @max_power:  pointer in which to store the maximum power
 883  *
 884  * Calculate the maximum power consumption in milliwats that the
 885  * cooling device can currently consume and store it in @max_power.
 886  *
 887  * Return: 0 on success, -EINVAL if @cdev doesn't support the
 888  * power_actor API or -E* on other error.
 889  */
 890 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 891                               struct thermal_zone_device *tz, u32 *max_power)
 892 {
 893         if (!cdev_is_power_actor(cdev))
 894                 return -EINVAL;
 895
 896         return cdev->ops->state2power(cdev, tz, 0, max_power);
 897 }
 898
 899 /**
 900  * power_actor_set_power() - limit the maximum power that a cooling device can consume
 901  * @cdev:       pointer to &thermal_cooling_device
 902  * @instance:   thermal instance to update
 903  * @power:      the power in milliwatts
 904  *
 905  * Set the cooling device to consume at most @power milliwatts.
 906  *
 907  * Return: 0 on success, -EINVAL if the cooling device does not
 908  * implement the power actor API or -E* for other failures.
 909  */
 910 int power_actor_set_power(struct thermal_cooling_device *cdev,
 911                           struct thermal_instance *instance, u32 power)
 912 {
 913         unsigned long state;
 914         int ret;
 915
 916         if (!cdev_is_power_actor(cdev))
 917                 return -EINVAL;
 918
 919         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
 920         if (ret)
 921                 return ret;
 922
 923         instance->target = state;
 924         cdev->updated = false;
 925         thermal_cdev_update(cdev);
 926
 927         return 0;
 928 }
 929
 930 static DEVICE_ATTR(type, 0444, type_show, NULL);
 931 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 932 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 933 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 934 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 935
 936 /* sys I/F for cooling device */
 937 #define to_cooling_device(_dev) \
 938         container_of(_dev, struct thermal_cooling_device, device)
 939
 940 static ssize_t
 941 thermal_cooling_device_type_show(struct device *dev,
 942                                  struct device_attribute *attr, char *buf)
 943 {
 944         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 945
 946         return sprintf(buf, "%s\n", cdev->type);
 947 }
 948
 949 static ssize_t
 950 thermal_cooling_device_max_state_show(struct device *dev,
 951                                       struct device_attribute *attr, char *buf)
 952 {
 953         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 954         unsigned long state;
 955         int ret;
 956
 957         ret = cdev->ops->get_max_state(cdev, &state);
 958         if (ret)
 959                 return ret;
 960         return sprintf(buf, "%ld\n", state);
 961 }
 962
 963 static ssize_t
 964 thermal_cooling_device_cur_state_show(struct device *dev,
 965                                       struct device_attribute *attr, char *buf)
 966 {
 967         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 968         unsigned long state;
 969         int ret;
 970
 971         ret = cdev->ops->get_cur_state(cdev, &state);
 972         if (ret)
 973                 return ret;
 974         return sprintf(buf, "%ld\n", state);
 975 }
 976
 977 static ssize_t
 978 thermal_cooling_device_cur_state_store(struct device *dev,
 979                                        struct device_attribute *attr,
 980                                        const char *buf, size_t count)
 981 {
 982         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 983         unsigned long state;
 984         int result;
 985
 986         if (!sscanf(buf, "%ld\n", &state))
 987                 return -EINVAL;
 988
 989         if ((long)state < 0)
 990                 return -EINVAL;
 991
 992         result = cdev->ops->set_cur_state(cdev, state);
 993         if (result)
 994                 return result;
 995         return count;
 996 }
 997
 998 static struct device_attribute dev_attr_cdev_type =
 999 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1000 static DEVICE_ATTR(max_state, 0444,
1001                    thermal_cooling_device_max_state_show, NULL);
1002 static DEVICE_ATTR(cur_state, 0644,
1003                    thermal_cooling_device_cur_state_show,
1004                    thermal_cooling_device_cur_state_store);
1005
1006 static ssize_t
1007 thermal_cooling_device_trip_point_show(struct device *dev,
1008                                        struct device_attribute *attr, char *buf)
1009 {
1010         struct thermal_instance *instance;
1011
1012         instance =
1013             container_of(attr, struct thermal_instance, attr);
1014
1015         if (instance->trip == THERMAL_TRIPS_NONE)
1016                 return sprintf(buf, "-1\n");
1017         else
1018                 return sprintf(buf, "%d\n", instance->trip);
1019 }
1020
1021 static struct attribute *cooling_device_attrs[] = {
1022         &dev_attr_cdev_type.attr,
1023         &dev_attr_max_state.attr,
1024         &dev_attr_cur_state.attr,
1025         NULL,
1026 };
1027
1028 static const struct attribute_group cooling_device_attr_group = {
1029         .attrs = cooling_device_attrs,
1030 };
1031
1032 static const struct attribute_group *cooling_device_attr_groups[] = {
1033         &cooling_device_attr_group,
1034         NULL,
1035 };
1036
1037 static ssize_t
1038 thermal_cooling_device_weight_show(struct device *dev,
1039                                    struct device_attribute *attr, char *buf)
1040 {
1041         struct thermal_instance *instance;
1042
1043         instance = container_of(attr, struct thermal_instance, weight_attr);
1044
1045         return sprintf(buf, "%d\n", instance->weight);
1046 }
1047
1048 static ssize_t
1049 thermal_cooling_device_weight_store(struct device *dev,
1050                                     struct device_attribute *attr,
1051                                     const char *buf, size_t count)
1052 {
1053         struct thermal_instance *instance;
1054         int ret, weight;
1055
1056         ret = kstrtoint(buf, 0, &weight);
1057         if (ret)
1058                 return ret;
1059
1060         instance = container_of(attr, struct thermal_instance, weight_attr);
1061         instance->weight = weight;
1062
1063         return count;
1064 }
1065 /* Device management */
1066
1067 /**
1068  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1069  * @tz:         pointer to struct thermal_zone_device
1070  * @trip:       indicates which trip point the cooling devices is
1071  *              associated with in this thermal zone.
1072  * @cdev:       pointer to struct thermal_cooling_device
1073  * @upper:      the Maximum cooling state for this trip point.
1074  *              THERMAL_NO_LIMIT means no upper limit,
1075  *              and the cooling device can be in max_state.
1076  * @lower:      the Minimum cooling state can be used for this trip point.
1077  *              THERMAL_NO_LIMIT means no lower limit,
1078  *              and the cooling device can be in cooling state 0.
1079  * @weight:     The weight of the cooling device to be bound to the
1080  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1081  *              default value
1082  *
1083  * This interface function bind a thermal cooling device to the certain trip
1084  * point of a thermal zone device.
1085  * This function is usually called in the thermal zone device .bind callback.
1086  *
1087  * Return: 0 on success, the proper error value otherwise.
1088  */
1089 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1090                                      int trip,
1091                                      struct thermal_cooling_device *cdev,
1092                                      unsigned long upper, unsigned long lower,
1093                                      unsigned int weight)
1094 {
1095         struct thermal_instance *dev;
1096         struct thermal_instance *pos;
1097         struct thermal_zone_device *pos1;
1098         struct thermal_cooling_device *pos2;
1099         unsigned long max_state;
1100         int result, ret;
1101
1102         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1103                 return -EINVAL;
1104
1105         list_for_each_entry(pos1, &thermal_tz_list, node) {
1106                 if (pos1 == tz)
1107                         break;
1108         }
1109         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1110                 if (pos2 == cdev)
1111                         break;
1112         }
1113
1114         if (tz != pos1 || cdev != pos2)
1115                 return -EINVAL;
1116
1117         ret = cdev->ops->get_max_state(cdev, &max_state);
1118         if (ret)
1119                 return ret;
1120
1121         /* lower default 0, upper default max_state */
1122         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1123         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1124
1125         if (lower > upper || upper > max_state)
1126                 return -EINVAL;
1127
1128         dev =
1129             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1130         if (!dev)
1131                 return -ENOMEM;
1132         dev->tz = tz;
1133         dev->cdev = cdev;
1134         dev->trip = trip;
1135         dev->upper = upper;
1136         dev->lower = lower;
1137         dev->target = THERMAL_NO_TARGET;
1138         dev->weight = weight;
1139
1140         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1141         if (result)
1142                 goto free_mem;
1143
1144         sprintf(dev->name, "cdev%d", dev->id);
1145         result =
1146             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1147         if (result)
1148                 goto release_idr;
1149
1150         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1151         sysfs_attr_init(&dev->attr.attr);
1152         dev->attr.attr.name = dev->attr_name;
1153         dev->attr.attr.mode = 0444;
1154         dev->attr.show = thermal_cooling_device_trip_point_show;
1155         result = device_create_file(&tz->device, &dev->attr);
1156         if (result)
1157                 goto remove_symbol_link;
1158
1159         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1160         sysfs_attr_init(&dev->weight_attr.attr);
1161         dev->weight_attr.attr.name = dev->weight_attr_name;
1162         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1163         dev->weight_attr.show = thermal_cooling_device_weight_show;
1164         dev->weight_attr.store = thermal_cooling_device_weight_store;
1165         result = device_create_file(&tz->device, &dev->weight_attr);
1166         if (result)
1167                 goto remove_trip_file;
1168
1169         mutex_lock(&tz->lock);
1170         mutex_lock(&cdev->lock);
1171         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1172             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1173                 result = -EEXIST;
1174                 break;
1175         }
1176         if (!result) {
1177                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1178                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1179         }
1180         mutex_unlock(&cdev->lock);
1181         mutex_unlock(&tz->lock);
1182
1183         if (!result)
1184                 return 0;
1185
1186         device_remove_file(&tz->device, &dev->weight_attr);
1187 remove_trip_file:
1188         device_remove_file(&tz->device, &dev->attr);
1189 remove_symbol_link:
1190         sysfs_remove_link(&tz->device.kobj, dev->name);
1191 release_idr:
1192         release_idr(&tz->idr, &tz->lock, dev->id);
1193 free_mem:
1194         kfree(dev);
1195         return result;
1196 }
1197 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1198
1199 /**
1200  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1201  *                                        thermal zone.
1202  * @tz:         pointer to a struct thermal_zone_device.
1203  * @trip:       indicates which trip point the cooling devices is
1204  *              associated with in this thermal zone.
1205  * @cdev:       pointer to a struct thermal_cooling_device.
1206  *
1207  * This interface function unbind a thermal cooling device from the certain
1208  * trip point of a thermal zone device.
1209  * This function is usually called in the thermal zone device .unbind callback.
1210  *
1211  * Return: 0 on success, the proper error value otherwise.
1212  */
1213 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1214                                        int trip,
1215                                        struct thermal_cooling_device *cdev)
1216 {
1217         struct thermal_instance *pos, *next;
1218
1219         mutex_lock(&tz->lock);
1220         mutex_lock(&cdev->lock);
1221         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1222                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1223                         list_del(&pos->tz_node);
1224                         list_del(&pos->cdev_node);
1225                         mutex_unlock(&cdev->lock);
1226                         mutex_unlock(&tz->lock);
1227                         goto unbind;
1228                 }
1229         }
1230         mutex_unlock(&cdev->lock);
1231         mutex_unlock(&tz->lock);
1232
1233         return -ENODEV;
1234
1235 unbind:
1236         device_remove_file(&tz->device, &pos->attr);
1237         sysfs_remove_link(&tz->device.kobj, pos->name);
1238         release_idr(&tz->idr, &tz->lock, pos->id);
1239         kfree(pos);
1240         return 0;
1241 }
1242 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1243
1244 static void thermal_release(struct device *dev)
1245 {
1246         struct thermal_zone_device *tz;
1247         struct thermal_cooling_device *cdev;
1248
1249         if (!strncmp(dev_name(dev), "thermal_zone",
1250                      sizeof("thermal_zone") - 1)) {
1251                 tz = to_thermal_zone(dev);
1252                 kfree(tz);
1253         } else if(!strncmp(dev_name(dev), "cooling_device",
1254                         sizeof("cooling_device") - 1)){
1255                 cdev = to_cooling_device(dev);
1256                 kfree(cdev);
1257         }
1258 }
1259
1260 static struct class thermal_class = {
1261         .name = "thermal",
1262         .dev_release = thermal_release,
1263 };
1264
1265 /**
1266  * __thermal_cooling_device_register() - register a new thermal cooling device
1267  * @np:         a pointer to a device tree node.
1268  * @type:       the thermal cooling device type.
1269  * @devdata:    device private data.
1270  * @ops:                standard thermal cooling devices callbacks.
1271  *
1272  * This interface function adds a new thermal cooling device (fan/processor/...)
1273  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1274  * to all the thermal zone devices registered at the same time.
1275  * It also gives the opportunity to link the cooling device to a device tree
1276  * node, so that it can be bound to a thermal zone created out of device tree.
1277  *
1278  * Return: a pointer to the created struct thermal_cooling_device or an
1279  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1280  */
1281 static struct thermal_cooling_device *
1282 __thermal_cooling_device_register(struct device_node *np,
1283                                   char *type, void *devdata,
1284                                   const struct thermal_cooling_device_ops *ops)
1285 {
1286         struct thermal_cooling_device *cdev;
1287         int result;
1288
1289         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1290                 return ERR_PTR(-EINVAL);
1291
1292         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1293             !ops->set_cur_state)
1294                 return ERR_PTR(-EINVAL);
1295
1296         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1297         if (!cdev)
1298                 return ERR_PTR(-ENOMEM);
1299
1300         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1301         if (result) {
1302                 kfree(cdev);
1303                 return ERR_PTR(result);
1304         }
1305
1306         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1307         mutex_init(&cdev->lock);
1308         INIT_LIST_HEAD(&cdev->thermal_instances);
1309         cdev->np = np;
1310         cdev->ops = ops;
1311         cdev->updated = false;
1312         cdev->device.class = &thermal_class;
1313         cdev->device.groups = cooling_device_attr_groups;
1314         cdev->devdata = devdata;
1315         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1316         result = device_register(&cdev->device);
1317         if (result) {
1318                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1319                 kfree(cdev);
1320                 return ERR_PTR(result);
1321         }
1322
1323         /* Add 'this' new cdev to the global cdev list */
1324         mutex_lock(&thermal_list_lock);
1325         list_add(&cdev->node, &thermal_cdev_list);
1326         mutex_unlock(&thermal_list_lock);
1327
1328         /* Update binding information for 'this' new cdev */
1329         bind_cdev(cdev);
1330
1331         return cdev;
1332 }
1333
1334 /**
1335  * thermal_cooling_device_register() - register a new thermal cooling device
1336  * @type:       the thermal cooling device type.
1337  * @devdata:    device private data.
1338  * @ops:                standard thermal cooling devices callbacks.
1339  *
1340  * This interface function adds a new thermal cooling device (fan/processor/...)
1341  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1342  * to all the thermal zone devices registered at the same time.
1343  *
1344  * Return: a pointer to the created struct thermal_cooling_device or an
1345  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1346  */
1347 struct thermal_cooling_device *
1348 thermal_cooling_device_register(char *type, void *devdata,
1349                                 const struct thermal_cooling_device_ops *ops)
1350 {
1351         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1352 }
1353 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1354
1355 /**
1356  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1357  * @np:         a pointer to a device tree node.
1358  * @type:       the thermal cooling device type.
1359  * @devdata:    device private data.
1360  * @ops:                standard thermal cooling devices callbacks.
1361  *
1362  * This function will register a cooling device with device tree node reference.
1363  * This interface function adds a new thermal cooling device (fan/processor/...)
1364  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1365  * to all the thermal zone devices registered at the same time.
1366  *
1367  * Return: a pointer to the created struct thermal_cooling_device or an
1368  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1369  */
1370 struct thermal_cooling_device *
1371 thermal_of_cooling_device_register(struct device_node *np,
1372                                    char *type, void *devdata,
1373                                    const struct thermal_cooling_device_ops *ops)
1374 {
1375         return __thermal_cooling_device_register(np, type, devdata, ops);
1376 }
1377 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1378
1379 /**
1380  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1381  * @cdev:       the thermal cooling device to remove.
1382  *
1383  * thermal_cooling_device_unregister() must be called when the device is no
1384  * longer needed.
1385  */
1386 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1387 {
1388         int i;
1389         const struct thermal_zone_params *tzp;
1390         struct thermal_zone_device *tz;
1391         struct thermal_cooling_device *pos = NULL;
1392
1393         if (!cdev)
1394                 return;
1395
1396         mutex_lock(&thermal_list_lock);
1397         list_for_each_entry(pos, &thermal_cdev_list, node)
1398             if (pos == cdev)
1399                 break;
1400         if (pos != cdev) {
1401                 /* thermal cooling device not found */
1402                 mutex_unlock(&thermal_list_lock);
1403                 return;
1404         }
1405         list_del(&cdev->node);
1406
1407         /* Unbind all thermal zones associated with 'this' cdev */
1408         list_for_each_entry(tz, &thermal_tz_list, node) {
1409                 if (tz->ops->unbind) {
1410                         tz->ops->unbind(tz, cdev);
1411                         continue;
1412                 }
1413
1414                 if (!tz->tzp || !tz->tzp->tbp)
1415                         continue;
1416
1417                 tzp = tz->tzp;
1418                 for (i = 0; i < tzp->num_tbps; i++) {
1419                         if (tzp->tbp[i].cdev == cdev) {
1420                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1421                                 tzp->tbp[i].cdev = NULL;
1422                         }
1423                 }
1424         }
1425
1426         mutex_unlock(&thermal_list_lock);
1427
1428         if (cdev->type[0])
1429                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1430         device_remove_file(&cdev->device, &dev_attr_max_state);
1431         device_remove_file(&cdev->device, &dev_attr_cur_state);
1432
1433         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1434         device_unregister(&cdev->device);
1435         return;
1436 }
1437 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1438
1439 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1440 {
1441         struct thermal_instance *instance;
1442         unsigned long target = 0;
1443
1444         /* cooling device is updated*/
1445         if (cdev->updated)
1446                 return;
1447
1448         mutex_lock(&cdev->lock);
1449         /* Make sure cdev enters the deepest cooling state */
1450         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1451                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1452                                 instance->tz->id, instance->target);
1453                 if (instance->target == THERMAL_NO_TARGET)
1454                         continue;
1455                 if (instance->target > target)
1456                         target = instance->target;
1457         }
1458         mutex_unlock(&cdev->lock);
1459         cdev->ops->set_cur_state(cdev, target);
1460         cdev->updated = true;
1461         trace_cdev_update(cdev, target);
1462         dev_dbg(&cdev->device, "set to state %lu\n", target);
1463 }
1464 EXPORT_SYMBOL(thermal_cdev_update);
1465
1466 /**
1467  * thermal_notify_framework - Sensor drivers use this API to notify framework
1468  * @tz:         thermal zone device
1469  * @trip:       indicates which trip point has been crossed
1470  *
1471  * This function handles the trip events from sensor drivers. It starts
1472  * throttling the cooling devices according to the policy configured.
1473  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1474  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1475  * The throttling policy is based on the configured platform data; if no
1476  * platform data is provided, this uses the step_wise throttling policy.
1477  */
1478 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1479 {
1480         handle_thermal_trip(tz, trip);
1481 }
1482 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1483
1484 /**
1485  * create_trip_attrs() - create attributes for trip points
1486  * @tz:         the thermal zone device
1487  * @mask:       Writeable trip point bitmap.
1488  *
1489  * helper function to instantiate sysfs entries for every trip
1490  * point and its properties of a struct thermal_zone_device.
1491  *
1492  * Return: 0 on success, the proper error value otherwise.
1493  */
1494 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1495 {
1496         int indx;
1497         int size = sizeof(struct thermal_attr) * tz->trips;
1498
1499         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1500         if (!tz->trip_type_attrs)
1501                 return -ENOMEM;
1502
1503         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1504         if (!tz->trip_temp_attrs) {
1505                 kfree(tz->trip_type_attrs);
1506                 return -ENOMEM;
1507         }
1508
1509         if (tz->ops->get_trip_hyst) {
1510                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1511                 if (!tz->trip_hyst_attrs) {
1512                         kfree(tz->trip_type_attrs);
1513                         kfree(tz->trip_temp_attrs);
1514                         return -ENOMEM;
1515                 }
1516         }
1517
1518
1519         for (indx = 0; indx < tz->trips; indx++) {
1520                 /* create trip type attribute */
1521                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1522                          "trip_point_%d_type", indx);
1523
1524                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1525                 tz->trip_type_attrs[indx].attr.attr.name =
1526                                                 tz->trip_type_attrs[indx].name;
1527                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1528                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1529
1530                 device_create_file(&tz->device,
1531                                    &tz->trip_type_attrs[indx].attr);
1532
1533                 /* create trip temp attribute */
1534                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1535                          "trip_point_%d_temp", indx);
1536
1537                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1538                 tz->trip_temp_attrs[indx].attr.attr.name =
1539                                                 tz->trip_temp_attrs[indx].name;
1540                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1541                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1542                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1543                     mask & (1 << indx)) {
1544                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1545                         tz->trip_temp_attrs[indx].attr.store =
1546                                                         trip_point_temp_store;
1547                 }
1548
1549                 device_create_file(&tz->device,
1550                                    &tz->trip_temp_attrs[indx].attr);
1551
1552                 /* create Optional trip hyst attribute */
1553                 if (!tz->ops->get_trip_hyst)
1554                         continue;
1555                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1556                          "trip_point_%d_hyst", indx);
1557
1558                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1559                 tz->trip_hyst_attrs[indx].attr.attr.name =
1560                                         tz->trip_hyst_attrs[indx].name;
1561                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1562                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1563                 if (tz->ops->set_trip_hyst) {
1564                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1565                         tz->trip_hyst_attrs[indx].attr.store =
1566                                         trip_point_hyst_store;
1567                 }
1568
1569                 device_create_file(&tz->device,
1570                                    &tz->trip_hyst_attrs[indx].attr);
1571         }
1572         return 0;
1573 }
1574
1575 static void remove_trip_attrs(struct thermal_zone_device *tz)
1576 {
1577         int indx;
1578
1579         for (indx = 0; indx < tz->trips; indx++) {
1580                 device_remove_file(&tz->device,
1581                                    &tz->trip_type_attrs[indx].attr);
1582                 device_remove_file(&tz->device,
1583                                    &tz->trip_temp_attrs[indx].attr);
1584                 if (tz->ops->get_trip_hyst)
1585                         device_remove_file(&tz->device,
1586                                   &tz->trip_hyst_attrs[indx].attr);
1587         }
1588         kfree(tz->trip_type_attrs);
1589         kfree(tz->trip_temp_attrs);
1590         kfree(tz->trip_hyst_attrs);
1591 }
1592
1593 /**
1594  * thermal_zone_device_register() - register a new thermal zone device
1595  * @type:       the thermal zone device type
1596  * @trips:      the number of trip points the thermal zone support
1597  * @mask:       a bit string indicating the writeablility of trip points
1598  * @devdata:    private device data
1599  * @ops:        standard thermal zone device callbacks
1600  * @tzp:        thermal zone platform parameters
1601  * @passive_delay: number of milliseconds to wait between polls when
1602  *                 performing passive cooling
1603  * @polling_delay: number of milliseconds to wait between polls when checking
1604  *                 whether trip points have been crossed (0 for interrupt
1605  *                 driven systems)
1606  *
1607  * This interface function adds a new thermal zone device (sensor) to
1608  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1609  * thermal cooling devices registered at the same time.
1610  * thermal_zone_device_unregister() must be called when the device is no
1611  * longer needed. The passive cooling depends on the .get_trend() return value.
1612  *
1613  * Return: a pointer to the created struct thermal_zone_device or an
1614  * in case of error, an ERR_PTR. Caller must check return value with
1615  * IS_ERR*() helpers.
1616  */
1617 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1618         int trips, int mask, void *devdata,
1619         struct thermal_zone_device_ops *ops,
1620         struct thermal_zone_params *tzp,
1621         int passive_delay, int polling_delay)
1622 {
1623         struct thermal_zone_device *tz;
1624         enum thermal_trip_type trip_type;
1625         int result;
1626         int count;
1627         int passive = 0;
1628         struct thermal_governor *governor;
1629
1630         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1631                 return ERR_PTR(-EINVAL);
1632
1633         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1634                 return ERR_PTR(-EINVAL);
1635
1636         if (!ops)
1637                 return ERR_PTR(-EINVAL);
1638
1639         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1640                 return ERR_PTR(-EINVAL);
1641
1642         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1643         if (!tz)
1644                 return ERR_PTR(-ENOMEM);
1645
1646         INIT_LIST_HEAD(&tz->thermal_instances);
1647         idr_init(&tz->idr);
1648         mutex_init(&tz->lock);
1649         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1650         if (result) {
1651                 kfree(tz);
1652                 return ERR_PTR(result);
1653         }
1654
1655         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1656         tz->ops = ops;
1657         tz->tzp = tzp;
1658         tz->device.class = &thermal_class;
1659         tz->devdata = devdata;
1660         tz->trips = trips;
1661         tz->passive_delay = passive_delay;
1662         tz->polling_delay = polling_delay;
1663
1664         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1665         result = device_register(&tz->device);
1666         if (result) {
1667                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1668                 kfree(tz);
1669                 return ERR_PTR(result);
1670         }
1671
1672         /* sys I/F */
1673         if (type) {
1674                 result = device_create_file(&tz->device, &dev_attr_type);
1675                 if (result)
1676                         goto unregister;
1677         }
1678
1679         result = device_create_file(&tz->device, &dev_attr_temp);
1680         if (result)
1681                 goto unregister;
1682
1683         if (ops->get_mode) {
1684                 result = device_create_file(&tz->device, &dev_attr_mode);
1685                 if (result)
1686                         goto unregister;
1687         }
1688
1689         result = create_trip_attrs(tz, mask);
1690         if (result)
1691                 goto unregister;
1692
1693         for (count = 0; count < trips; count++) {
1694                 tz->ops->get_trip_type(tz, count, &trip_type);
1695                 if (trip_type == THERMAL_TRIP_PASSIVE)
1696                         passive = 1;
1697         }
1698
1699         if (!passive) {
1700                 result = device_create_file(&tz->device, &dev_attr_passive);
1701                 if (result)
1702                         goto unregister;
1703         }
1704
1705 #ifdef CONFIG_THERMAL_EMULATION
1706         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1707         if (result)
1708                 goto unregister;
1709 #endif
1710         /* Create policy attribute */
1711         result = device_create_file(&tz->device, &dev_attr_policy);
1712         if (result)
1713                 goto unregister;
1714
1715         /* Update 'this' zone's governor information */
1716         mutex_lock(&thermal_governor_lock);
1717
1718         if (tz->tzp)
1719                 governor = __find_governor(tz->tzp->governor_name);
1720         else
1721                 governor = def_governor;
1722
1723         result = thermal_set_governor(tz, governor);
1724         if (result) {
1725                 mutex_unlock(&thermal_governor_lock);
1726                 goto unregister;
1727         }
1728
1729         mutex_unlock(&thermal_governor_lock);
1730
1731         if (!tz->tzp || !tz->tzp->no_hwmon) {
1732                 result = thermal_add_hwmon_sysfs(tz);
1733                 if (result)
1734                         goto unregister;
1735         }
1736
1737         mutex_lock(&thermal_list_lock);
1738         list_add_tail(&tz->node, &thermal_tz_list);
1739         mutex_unlock(&thermal_list_lock);
1740
1741         /* Bind cooling devices for this zone */
1742         bind_tz(tz);
1743
1744         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1745
1746         if (!tz->ops->get_temp)
1747                 thermal_zone_device_set_polling(tz, 0);
1748
1749         thermal_zone_device_update(tz);
1750
1751         return tz;
1752
1753 unregister:
1754         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1755         device_unregister(&tz->device);
1756         return ERR_PTR(result);
1757 }
1758 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1759
1760 /**
1761  * thermal_device_unregister - removes the registered thermal zone device
1762  * @tz: the thermal zone device to remove
1763  */
1764 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1765 {
1766         int i;
1767         const struct thermal_zone_params *tzp;
1768         struct thermal_cooling_device *cdev;
1769         struct thermal_zone_device *pos = NULL;
1770
1771         if (!tz)
1772                 return;
1773
1774         tzp = tz->tzp;
1775
1776         mutex_lock(&thermal_list_lock);
1777         list_for_each_entry(pos, &thermal_tz_list, node)
1778             if (pos == tz)
1779                 break;
1780         if (pos != tz) {
1781                 /* thermal zone device not found */
1782                 mutex_unlock(&thermal_list_lock);
1783                 return;
1784         }
1785         list_del(&tz->node);
1786
1787         /* Unbind all cdevs associated with 'this' thermal zone */
1788         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1789                 if (tz->ops->unbind) {
1790                         tz->ops->unbind(tz, cdev);
1791                         continue;
1792                 }
1793
1794                 if (!tzp || !tzp->tbp)
1795                         break;
1796
1797                 for (i = 0; i < tzp->num_tbps; i++) {
1798                         if (tzp->tbp[i].cdev == cdev) {
1799                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1800                                 tzp->tbp[i].cdev = NULL;
1801                         }
1802                 }
1803         }
1804
1805         mutex_unlock(&thermal_list_lock);
1806
1807         thermal_zone_device_set_polling(tz, 0);
1808
1809         if (tz->type[0])
1810                 device_remove_file(&tz->device, &dev_attr_type);
1811         device_remove_file(&tz->device, &dev_attr_temp);
1812         if (tz->ops->get_mode)
1813                 device_remove_file(&tz->device, &dev_attr_mode);
1814         device_remove_file(&tz->device, &dev_attr_policy);
1815         remove_trip_attrs(tz);
1816         thermal_set_governor(tz, NULL);
1817
1818         thermal_remove_hwmon_sysfs(tz);
1819         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1820         idr_destroy(&tz->idr);
1821         mutex_destroy(&tz->lock);
1822         device_unregister(&tz->device);
1823         return;
1824 }
1825 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1826
1827 /**
1828  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1829  * @name: thermal zone name to fetch the temperature
1830  *
1831  * When only one zone is found with the passed name, returns a reference to it.
1832  *
1833  * Return: On success returns a reference to an unique thermal zone with
1834  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1835  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1836  */
1837 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1838 {
1839         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1840         unsigned int found = 0;
1841
1842         if (!name)
1843                 goto exit;
1844
1845         mutex_lock(&thermal_list_lock);
1846         list_for_each_entry(pos, &thermal_tz_list, node)
1847                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1848                         found++;
1849                         ref = pos;
1850                 }
1851         mutex_unlock(&thermal_list_lock);
1852
1853         /* nothing has been found, thus an error code for it */
1854         if (found == 0)
1855                 ref = ERR_PTR(-ENODEV);
1856         else if (found > 1)
1857         /* Success only when an unique zone is found */
1858                 ref = ERR_PTR(-EEXIST);
1859
1860 exit:
1861         return ref;
1862 }
1863 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1864
1865 #ifdef CONFIG_NET
1866 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1867         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1868 };
1869
1870 static struct genl_family thermal_event_genl_family = {
1871         .id = GENL_ID_GENERATE,
1872         .name = THERMAL_GENL_FAMILY_NAME,
1873         .version = THERMAL_GENL_VERSION,
1874         .maxattr = THERMAL_GENL_ATTR_MAX,
1875         .mcgrps = thermal_event_mcgrps,
1876         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1877 };
1878
1879 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1880                                         enum events event)
1881 {
1882         struct sk_buff *skb;
1883         struct nlattr *attr;
1884         struct thermal_genl_event *thermal_event;
1885         void *msg_header;
1886         int size;
1887         int result;
1888         static unsigned int thermal_event_seqnum;
1889
1890         if (!tz)
1891                 return -EINVAL;
1892
1893         /* allocate memory */
1894         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1895                nla_total_size(0);
1896
1897         skb = genlmsg_new(size, GFP_ATOMIC);
1898         if (!skb)
1899                 return -ENOMEM;
1900
1901         /* add the genetlink message header */
1902         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1903                                  &thermal_event_genl_family, 0,
1904                                  THERMAL_GENL_CMD_EVENT);
1905         if (!msg_header) {
1906                 nlmsg_free(skb);
1907                 return -ENOMEM;
1908         }
1909
1910         /* fill the data */
1911         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1912                            sizeof(struct thermal_genl_event));
1913
1914         if (!attr) {
1915                 nlmsg_free(skb);
1916                 return -EINVAL;
1917         }
1918
1919         thermal_event = nla_data(attr);
1920         if (!thermal_event) {
1921                 nlmsg_free(skb);
1922                 return -EINVAL;
1923         }
1924
1925         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1926
1927         thermal_event->orig = tz->id;
1928         thermal_event->event = event;
1929
1930         /* send multicast genetlink message */
1931         genlmsg_end(skb, msg_header);
1932
1933         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1934                                    0, GFP_ATOMIC);
1935         if (result)
1936                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1937
1938         return result;
1939 }
1940 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1941
1942 static int genetlink_init(void)
1943 {
1944         return genl_register_family(&thermal_event_genl_family);
1945 }
1946
1947 static void genetlink_exit(void)
1948 {
1949         genl_unregister_family(&thermal_event_genl_family);
1950 }
1951 #else /* !CONFIG_NET */
1952 static inline int genetlink_init(void) { return 0; }
1953 static inline void genetlink_exit(void) {}
1954 #endif /* !CONFIG_NET */
1955
1956 static int __init thermal_register_governors(void)
1957 {
1958         int result;
1959
1960         result = thermal_gov_step_wise_register();
1961         if (result)
1962                 return result;
1963
1964         result = thermal_gov_fair_share_register();
1965         if (result)
1966                 return result;
1967
1968         result = thermal_gov_bang_bang_register();
1969         if (result)
1970                 return result;
1971
1972         result = thermal_gov_user_space_register();
1973         if (result)
1974                 return result;
1975
1976         return thermal_gov_power_allocator_register();
1977 }
1978
1979 static void thermal_unregister_governors(void)
1980 {
1981         thermal_gov_step_wise_unregister();
1982         thermal_gov_fair_share_unregister();
1983         thermal_gov_bang_bang_unregister();
1984         thermal_gov_user_space_unregister();
1985         thermal_gov_power_allocator_unregister();
1986 }
1987
1988 static int __init thermal_init(void)
1989 {
1990         int result;
1991
1992         result = thermal_register_governors();
1993         if (result)
1994                 goto error;
1995
1996         result = class_register(&thermal_class);
1997         if (result)
1998                 goto unregister_governors;
1999
2000         result = genetlink_init();
2001         if (result)
2002                 goto unregister_class;
2003
2004         result = of_parse_thermal_zones();
2005         if (result)
2006                 goto exit_netlink;
2007
2008         return 0;
2009
2010 exit_netlink:
2011         genetlink_exit();
2012 unregister_class:
2013         class_unregister(&thermal_class);
2014 unregister_governors:
2015         thermal_unregister_governors();
2016 error:
2017         idr_destroy(&thermal_tz_idr);
2018         idr_destroy(&thermal_cdev_idr);
2019         mutex_destroy(&thermal_idr_lock);
2020         mutex_destroy(&thermal_list_lock);
2021         mutex_destroy(&thermal_governor_lock);
2022         return result;
2023 }
2024
2025 static void __exit thermal_exit(void)
2026 {
2027         of_thermal_destroy_zones();
2028         genetlink_exit();
2029         class_unregister(&thermal_class);
2030         thermal_unregister_governors();
2031         idr_destroy(&thermal_tz_idr);
2032         idr_destroy(&thermal_cdev_idr);
2033         mutex_destroy(&thermal_idr_lock);
2034         mutex_destroy(&thermal_list_lock);
2035         mutex_destroy(&thermal_governor_lock);
2036 }
2037
2038 fs_initcall(thermal_init);
2039 module_exit(thermal_exit);