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         int 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 the temperature of a 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, int *temp)
 478 {
 479         int ret = -EINVAL;
 480         int count;
 481         int crit_temp = INT_MAX;
 482         enum thermal_trip_type type;
 483
 484         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 485                 goto exit;
 486
 487         mutex_lock(&tz->lock);
 488
 489         ret = tz->ops->get_temp(tz, temp);
 490
 491         if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 492                 for (count = 0; count < tz->trips; count++) {
 493                         ret = tz->ops->get_trip_type(tz, count, &type);
 494                         if (!ret && type == THERMAL_TRIP_CRITICAL) {
 495                                 ret = tz->ops->get_trip_temp(tz, count,
 496                                                 &crit_temp);
 497                                 break;
 498                         }
 499                 }
 500
 501                 /*
 502                  * Only allow emulating a temperature when the real temperature
 503                  * is below the critical temperature so that the emulation code
 504                  * cannot hide critical conditions.
 505                  */
 506                 if (!ret && *temp < crit_temp)
 507                         *temp = tz->emul_temperature;
 508         }
 509
 510         mutex_unlock(&tz->lock);
 511 exit:
 512         return ret;
 513 }
 514 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 515
 516 static void update_temperature(struct thermal_zone_device *tz)
 517 {
 518         int temp, ret;
 519
 520         ret = thermal_zone_get_temp(tz, &temp);
 521         if (ret) {
 522                 if (ret != -EAGAIN)
 523                         dev_warn(&tz->device,
 524                                  "failed to read out thermal zone (%d)\n",
 525                                  ret);
 526                 return;
 527         }
 528
 529         mutex_lock(&tz->lock);
 530         tz->last_temperature = tz->temperature;
 531         tz->temperature = temp;
 532         mutex_unlock(&tz->lock);
 533
 534         trace_thermal_temperature(tz);
 535         dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 536                                 tz->last_temperature, tz->temperature);
 537 }
 538
 539 void thermal_zone_device_update(struct thermal_zone_device *tz)
 540 {
 541         int count;
 542
 543         if (!tz->ops->get_temp)
 544                 return;
 545
 546         update_temperature(tz);
 547
 548         for (count = 0; count < tz->trips; count++)
 549                 handle_thermal_trip(tz, count);
 550 }
 551 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 552
 553 static void thermal_zone_device_check(struct work_struct *work)
 554 {
 555         struct thermal_zone_device *tz = container_of(work, struct
 556                                                       thermal_zone_device,
 557                                                       poll_queue.work);
 558         thermal_zone_device_update(tz);
 559 }
 560
 561 /* sys I/F for thermal zone */
 562
 563 #define to_thermal_zone(_dev) \
 564         container_of(_dev, struct thermal_zone_device, device)
 565
 566 static ssize_t
 567 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 568 {
 569         struct thermal_zone_device *tz = to_thermal_zone(dev);
 570
 571         return sprintf(buf, "%s\n", tz->type);
 572 }
 573
 574 static ssize_t
 575 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 576 {
 577         struct thermal_zone_device *tz = to_thermal_zone(dev);
 578         int temperature, ret;
 579
 580         ret = thermal_zone_get_temp(tz, &temperature);
 581
 582         if (ret)
 583                 return ret;
 584
 585         return sprintf(buf, "%d\n", temperature);
 586 }
 587
 588 static ssize_t
 589 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 590 {
 591         struct thermal_zone_device *tz = to_thermal_zone(dev);
 592         enum thermal_device_mode mode;
 593         int result;
 594
 595         if (!tz->ops->get_mode)
 596                 return -EPERM;
 597
 598         result = tz->ops->get_mode(tz, &mode);
 599         if (result)
 600                 return result;
 601
 602         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 603                        : "disabled");
 604 }
 605
 606 static ssize_t
 607 mode_store(struct device *dev, struct device_attribute *attr,
 608            const char *buf, size_t count)
 609 {
 610         struct thermal_zone_device *tz = to_thermal_zone(dev);
 611         int result;
 612
 613         if (!tz->ops->set_mode)
 614                 return -EPERM;
 615
 616         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 617                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 618         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 619                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 620         else
 621                 result = -EINVAL;
 622
 623         if (result)
 624                 return result;
 625
 626         return count;
 627 }
 628
 629 static ssize_t
 630 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 631                      char *buf)
 632 {
 633         struct thermal_zone_device *tz = to_thermal_zone(dev);
 634         enum thermal_trip_type type;
 635         int trip, result;
 636
 637         if (!tz->ops->get_trip_type)
 638                 return -EPERM;
 639
 640         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 641                 return -EINVAL;
 642
 643         result = tz->ops->get_trip_type(tz, trip, &type);
 644         if (result)
 645                 return result;
 646
 647         switch (type) {
 648         case THERMAL_TRIP_CRITICAL:
 649                 return sprintf(buf, "critical\n");
 650         case THERMAL_TRIP_HOT:
 651                 return sprintf(buf, "hot\n");
 652         case THERMAL_TRIP_PASSIVE:
 653                 return sprintf(buf, "passive\n");
 654         case THERMAL_TRIP_ACTIVE:
 655                 return sprintf(buf, "active\n");
 656         default:
 657                 return sprintf(buf, "unknown\n");
 658         }
 659 }
 660
 661 static ssize_t
 662 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 663                      const char *buf, size_t count)
 664 {
 665         struct thermal_zone_device *tz = to_thermal_zone(dev);
 666         int trip, ret;
 667         unsigned long temperature;
 668
 669         if (!tz->ops->set_trip_temp)
 670                 return -EPERM;
 671
 672         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 673                 return -EINVAL;
 674
 675         if (kstrtoul(buf, 10, &temperature))
 676                 return -EINVAL;
 677
 678         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 679         if (ret)
 680                 return ret;
 681
 682         thermal_zone_device_update(tz);
 683
 684         return count;
 685 }
 686
 687 static ssize_t
 688 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 689                      char *buf)
 690 {
 691         struct thermal_zone_device *tz = to_thermal_zone(dev);
 692         int trip, ret;
 693         int temperature;
 694
 695         if (!tz->ops->get_trip_temp)
 696                 return -EPERM;
 697
 698         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 699                 return -EINVAL;
 700
 701         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 702
 703         if (ret)
 704                 return ret;
 705
 706         return sprintf(buf, "%d\n", temperature);
 707 }
 708
 709 static ssize_t
 710 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 711                         const char *buf, size_t count)
 712 {
 713         struct thermal_zone_device *tz = to_thermal_zone(dev);
 714         int trip, ret;
 715         int temperature;
 716
 717         if (!tz->ops->set_trip_hyst)
 718                 return -EPERM;
 719
 720         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 721                 return -EINVAL;
 722
 723         if (kstrtoint(buf, 10, &temperature))
 724                 return -EINVAL;
 725
 726         /*
 727          * We are not doing any check on the 'temperature' value
 728          * here. The driver implementing 'set_trip_hyst' has to
 729          * take care of this.
 730          */
 731         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 732
 733         return ret ? ret : count;
 734 }
 735
 736 static ssize_t
 737 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 738                         char *buf)
 739 {
 740         struct thermal_zone_device *tz = to_thermal_zone(dev);
 741         int trip, ret;
 742         int temperature;
 743
 744         if (!tz->ops->get_trip_hyst)
 745                 return -EPERM;
 746
 747         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 748                 return -EINVAL;
 749
 750         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 751
 752         return ret ? ret : sprintf(buf, "%d\n", temperature);
 753 }
 754
 755 static ssize_t
 756 passive_store(struct device *dev, struct device_attribute *attr,
 757                     const char *buf, size_t count)
 758 {
 759         struct thermal_zone_device *tz = to_thermal_zone(dev);
 760         struct thermal_cooling_device *cdev = NULL;
 761         int state;
 762
 763         if (!sscanf(buf, "%d\n", &state))
 764                 return -EINVAL;
 765
 766         /* sanity check: values below 1000 millicelcius don't make sense
 767          * and can cause the system to go into a thermal heart attack
 768          */
 769         if (state && state < 1000)
 770                 return -EINVAL;
 771
 772         if (state && !tz->forced_passive) {
 773                 mutex_lock(&thermal_list_lock);
 774                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 775                         if (!strncmp("Processor", cdev->type,
 776                                      sizeof("Processor")))
 777                                 thermal_zone_bind_cooling_device(tz,
 778                                                 THERMAL_TRIPS_NONE, cdev,
 779                                                 THERMAL_NO_LIMIT,
 780                                                 THERMAL_NO_LIMIT,
 781                                                 THERMAL_WEIGHT_DEFAULT);
 782                 }
 783                 mutex_unlock(&thermal_list_lock);
 784                 if (!tz->passive_delay)
 785                         tz->passive_delay = 1000;
 786         } else if (!state && tz->forced_passive) {
 787                 mutex_lock(&thermal_list_lock);
 788                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 789                         if (!strncmp("Processor", cdev->type,
 790                                      sizeof("Processor")))
 791                                 thermal_zone_unbind_cooling_device(tz,
 792                                                                    THERMAL_TRIPS_NONE,
 793                                                                    cdev);
 794                 }
 795                 mutex_unlock(&thermal_list_lock);
 796                 tz->passive_delay = 0;
 797         }
 798
 799         tz->forced_passive = state;
 800
 801         thermal_zone_device_update(tz);
 802
 803         return count;
 804 }
 805
 806 static ssize_t
 807 passive_show(struct device *dev, struct device_attribute *attr,
 808                    char *buf)
 809 {
 810         struct thermal_zone_device *tz = to_thermal_zone(dev);
 811
 812         return sprintf(buf, "%d\n", tz->forced_passive);
 813 }
 814
 815 static ssize_t
 816 policy_store(struct device *dev, struct device_attribute *attr,
 817                     const char *buf, size_t count)
 818 {
 819         int ret = -EINVAL;
 820         struct thermal_zone_device *tz = to_thermal_zone(dev);
 821         struct thermal_governor *gov;
 822         char name[THERMAL_NAME_LENGTH];
 823
 824         snprintf(name, sizeof(name), "%s", buf);
 825
 826         mutex_lock(&thermal_governor_lock);
 827         mutex_lock(&tz->lock);
 828
 829         gov = __find_governor(strim(name));
 830         if (!gov)
 831                 goto exit;
 832
 833         ret = thermal_set_governor(tz, gov);
 834         if (!ret)
 835                 ret = count;
 836
 837 exit:
 838         mutex_unlock(&tz->lock);
 839         mutex_unlock(&thermal_governor_lock);
 840         return ret;
 841 }
 842
 843 static ssize_t
 844 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 845 {
 846         struct thermal_zone_device *tz = to_thermal_zone(dev);
 847
 848         return sprintf(buf, "%s\n", tz->governor->name);
 849 }
 850
 851 static ssize_t
 852 available_policies_show(struct device *dev, struct device_attribute *devattr,
 853                         char *buf)
 854 {
 855         struct thermal_governor *pos;
 856         ssize_t count = 0;
 857         ssize_t size = PAGE_SIZE;
 858
 859         mutex_lock(&thermal_governor_lock);
 860
 861         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 862                 size = PAGE_SIZE - count;
 863                 count += scnprintf(buf + count, size, "%s ", pos->name);
 864         }
 865         count += scnprintf(buf + count, size, "\n");
 866
 867         mutex_unlock(&thermal_governor_lock);
 868
 869         return count;
 870 }
 871
 872 static ssize_t
 873 emul_temp_store(struct device *dev, struct device_attribute *attr,
 874                      const char *buf, size_t count)
 875 {
 876         struct thermal_zone_device *tz = to_thermal_zone(dev);
 877         int ret = 0;
 878         unsigned long temperature;
 879
 880         if (kstrtoul(buf, 10, &temperature))
 881                 return -EINVAL;
 882
 883         if (!tz->ops->set_emul_temp) {
 884                 mutex_lock(&tz->lock);
 885                 tz->emul_temperature = temperature;
 886                 mutex_unlock(&tz->lock);
 887         } else {
 888                 ret = tz->ops->set_emul_temp(tz, temperature);
 889         }
 890
 891         if (!ret)
 892                 thermal_zone_device_update(tz);
 893
 894         return ret ? ret : count;
 895 }
 896 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 897
 898 static ssize_t
 899 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 900                        char *buf)
 901 {
 902         struct thermal_zone_device *tz = to_thermal_zone(dev);
 903
 904         if (tz->tzp)
 905                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 906         else
 907                 return -EIO;
 908 }
 909
 910 static ssize_t
 911 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 912                         const char *buf, size_t count)
 913 {
 914         struct thermal_zone_device *tz = to_thermal_zone(dev);
 915         u32 sustainable_power;
 916
 917         if (!tz->tzp)
 918                 return -EIO;
 919
 920         if (kstrtou32(buf, 10, &sustainable_power))
 921                 return -EINVAL;
 922
 923         tz->tzp->sustainable_power = sustainable_power;
 924
 925         return count;
 926 }
 927 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 928                 sustainable_power_store);
 929
 930 #define create_s32_tzp_attr(name)                                       \
 931         static ssize_t                                                  \
 932         name##_show(struct device *dev, struct device_attribute *devattr, \
 933                 char *buf)                                              \
 934         {                                                               \
 935         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
 936                                                                         \
 937         if (tz->tzp)                                                    \
 938                 return sprintf(buf, "%u\n", tz->tzp->name);             \
 939         else                                                            \
 940                 return -EIO;                                            \
 941         }                                                               \
 942                                                                         \
 943         static ssize_t                                                  \
 944         name##_store(struct device *dev, struct device_attribute *devattr, \
 945                 const char *buf, size_t count)                          \
 946         {                                                               \
 947                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
 948                 s32 value;                                              \
 949                                                                         \
 950                 if (!tz->tzp)                                           \
 951                         return -EIO;                                    \
 952                                                                         \
 953                 if (kstrtos32(buf, 10, &value))                         \
 954                         return -EINVAL;                                 \
 955                                                                         \
 956                 tz->tzp->name = value;                                  \
 957                                                                         \
 958                 return count;                                           \
 959         }                                                               \
 960         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
 961
 962 create_s32_tzp_attr(k_po);
 963 create_s32_tzp_attr(k_pu);
 964 create_s32_tzp_attr(k_i);
 965 create_s32_tzp_attr(k_d);
 966 create_s32_tzp_attr(integral_cutoff);
 967 create_s32_tzp_attr(slope);
 968 create_s32_tzp_attr(offset);
 969 #undef create_s32_tzp_attr
 970
 971 static struct device_attribute *dev_tzp_attrs[] = {
 972         &dev_attr_sustainable_power,
 973         &dev_attr_k_po,
 974         &dev_attr_k_pu,
 975         &dev_attr_k_i,
 976         &dev_attr_k_d,
 977         &dev_attr_integral_cutoff,
 978         &dev_attr_slope,
 979         &dev_attr_offset,
 980 };
 981
 982 static int create_tzp_attrs(struct device *dev)
 983 {
 984         int i;
 985
 986         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
 987                 int ret;
 988                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
 989
 990                 ret = device_create_file(dev, dev_attr);
 991                 if (ret)
 992                         return ret;
 993         }
 994
 995         return 0;
 996 }
 997
 998 /**
 999  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1000  * @cdev:       pointer to &thermal_cooling_device
1001  * @tz:         a valid thermal zone device pointer
1002  * @max_power:  pointer in which to store the maximum power
1003  *
1004  * Calculate the maximum power consumption in milliwats that the
1005  * cooling device can currently consume and store it in @max_power.
1006  *
1007  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1008  * power_actor API or -E* on other error.
1009  */
1010 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1011                               struct thermal_zone_device *tz, u32 *max_power)
1012 {
1013         if (!cdev_is_power_actor(cdev))
1014                 return -EINVAL;
1015
1016         return cdev->ops->state2power(cdev, tz, 0, max_power);
1017 }
1018
1019 /**
1020  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1021  * @cdev:       pointer to &thermal_cooling_device
1022  * @tz:         a valid thermal zone device pointer
1023  * @min_power:  pointer in which to store the minimum power
1024  *
1025  * Calculate the minimum power consumption in milliwatts that the
1026  * cooling device can currently consume and store it in @min_power.
1027  *
1028  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1029  * power_actor API or -E* on other error.
1030  */
1031 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1032                               struct thermal_zone_device *tz, u32 *min_power)
1033 {
1034         unsigned long max_state;
1035         int ret;
1036
1037         if (!cdev_is_power_actor(cdev))
1038                 return -EINVAL;
1039
1040         ret = cdev->ops->get_max_state(cdev, &max_state);
1041         if (ret)
1042                 return ret;
1043
1044         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1045 }
1046
1047 /**
1048  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1049  * @cdev:       pointer to &thermal_cooling_device
1050  * @instance:   thermal instance to update
1051  * @power:      the power in milliwatts
1052  *
1053  * Set the cooling device to consume at most @power milliwatts.
1054  *
1055  * Return: 0 on success, -EINVAL if the cooling device does not
1056  * implement the power actor API or -E* for other failures.
1057  */
1058 int power_actor_set_power(struct thermal_cooling_device *cdev,
1059                           struct thermal_instance *instance, u32 power)
1060 {
1061         unsigned long state;
1062         int ret;
1063
1064         if (!cdev_is_power_actor(cdev))
1065                 return -EINVAL;
1066
1067         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1068         if (ret)
1069                 return ret;
1070
1071         instance->target = state;
1072         cdev->updated = false;
1073         thermal_cdev_update(cdev);
1074
1075         return 0;
1076 }
1077
1078 static DEVICE_ATTR(type, 0444, type_show, NULL);
1079 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1080 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1081 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1082 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1083 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1084
1085 /* sys I/F for cooling device */
1086 #define to_cooling_device(_dev) \
1087         container_of(_dev, struct thermal_cooling_device, device)
1088
1089 static ssize_t
1090 thermal_cooling_device_type_show(struct device *dev,
1091                                  struct device_attribute *attr, char *buf)
1092 {
1093         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1094
1095         return sprintf(buf, "%s\n", cdev->type);
1096 }
1097
1098 static ssize_t
1099 thermal_cooling_device_max_state_show(struct device *dev,
1100                                       struct device_attribute *attr, char *buf)
1101 {
1102         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1103         unsigned long state;
1104         int ret;
1105
1106         ret = cdev->ops->get_max_state(cdev, &state);
1107         if (ret)
1108                 return ret;
1109         return sprintf(buf, "%ld\n", state);
1110 }
1111
1112 static ssize_t
1113 thermal_cooling_device_cur_state_show(struct device *dev,
1114                                       struct device_attribute *attr, char *buf)
1115 {
1116         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1117         unsigned long state;
1118         int ret;
1119
1120         ret = cdev->ops->get_cur_state(cdev, &state);
1121         if (ret)
1122                 return ret;
1123         return sprintf(buf, "%ld\n", state);
1124 }
1125
1126 static ssize_t
1127 thermal_cooling_device_cur_state_store(struct device *dev,
1128                                        struct device_attribute *attr,
1129                                        const char *buf, size_t count)
1130 {
1131         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1132         unsigned long state;
1133         int result;
1134
1135         if (!sscanf(buf, "%ld\n", &state))
1136                 return -EINVAL;
1137
1138         if ((long)state < 0)
1139                 return -EINVAL;
1140
1141         result = cdev->ops->set_cur_state(cdev, state);
1142         if (result)
1143                 return result;
1144         return count;
1145 }
1146
1147 static struct device_attribute dev_attr_cdev_type =
1148 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1149 static DEVICE_ATTR(max_state, 0444,
1150                    thermal_cooling_device_max_state_show, NULL);
1151 static DEVICE_ATTR(cur_state, 0644,
1152                    thermal_cooling_device_cur_state_show,
1153                    thermal_cooling_device_cur_state_store);
1154
1155 static ssize_t
1156 thermal_cooling_device_trip_point_show(struct device *dev,
1157                                        struct device_attribute *attr, char *buf)
1158 {
1159         struct thermal_instance *instance;
1160
1161         instance =
1162             container_of(attr, struct thermal_instance, attr);
1163
1164         if (instance->trip == THERMAL_TRIPS_NONE)
1165                 return sprintf(buf, "-1\n");
1166         else
1167                 return sprintf(buf, "%d\n", instance->trip);
1168 }
1169
1170 static struct attribute *cooling_device_attrs[] = {
1171         &dev_attr_cdev_type.attr,
1172         &dev_attr_max_state.attr,
1173         &dev_attr_cur_state.attr,
1174         NULL,
1175 };
1176
1177 static const struct attribute_group cooling_device_attr_group = {
1178         .attrs = cooling_device_attrs,
1179 };
1180
1181 static const struct attribute_group *cooling_device_attr_groups[] = {
1182         &cooling_device_attr_group,
1183         NULL,
1184 };
1185
1186 static ssize_t
1187 thermal_cooling_device_weight_show(struct device *dev,
1188                                    struct device_attribute *attr, char *buf)
1189 {
1190         struct thermal_instance *instance;
1191
1192         instance = container_of(attr, struct thermal_instance, weight_attr);
1193
1194         return sprintf(buf, "%d\n", instance->weight);
1195 }
1196
1197 static ssize_t
1198 thermal_cooling_device_weight_store(struct device *dev,
1199                                     struct device_attribute *attr,
1200                                     const char *buf, size_t count)
1201 {
1202         struct thermal_instance *instance;
1203         int ret, weight;
1204
1205         ret = kstrtoint(buf, 0, &weight);
1206         if (ret)
1207                 return ret;
1208
1209         instance = container_of(attr, struct thermal_instance, weight_attr);
1210         instance->weight = weight;
1211
1212         return count;
1213 }
1214 /* Device management */
1215
1216 /**
1217  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1218  * @tz:         pointer to struct thermal_zone_device
1219  * @trip:       indicates which trip point the cooling devices is
1220  *              associated with in this thermal zone.
1221  * @cdev:       pointer to struct thermal_cooling_device
1222  * @upper:      the Maximum cooling state for this trip point.
1223  *              THERMAL_NO_LIMIT means no upper limit,
1224  *              and the cooling device can be in max_state.
1225  * @lower:      the Minimum cooling state can be used for this trip point.
1226  *              THERMAL_NO_LIMIT means no lower limit,
1227  *              and the cooling device can be in cooling state 0.
1228  * @weight:     The weight of the cooling device to be bound to the
1229  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1230  *              default value
1231  *
1232  * This interface function bind a thermal cooling device to the certain trip
1233  * point of a thermal zone device.
1234  * This function is usually called in the thermal zone device .bind callback.
1235  *
1236  * Return: 0 on success, the proper error value otherwise.
1237  */
1238 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1239                                      int trip,
1240                                      struct thermal_cooling_device *cdev,
1241                                      unsigned long upper, unsigned long lower,
1242                                      unsigned int weight)
1243 {
1244         struct thermal_instance *dev;
1245         struct thermal_instance *pos;
1246         struct thermal_zone_device *pos1;
1247         struct thermal_cooling_device *pos2;
1248         unsigned long max_state;
1249         int result, ret;
1250
1251         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1252                 return -EINVAL;
1253
1254         list_for_each_entry(pos1, &thermal_tz_list, node) {
1255                 if (pos1 == tz)
1256                         break;
1257         }
1258         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1259                 if (pos2 == cdev)
1260                         break;
1261         }
1262
1263         if (tz != pos1 || cdev != pos2)
1264                 return -EINVAL;
1265
1266         ret = cdev->ops->get_max_state(cdev, &max_state);
1267         if (ret)
1268                 return ret;
1269
1270         /* lower default 0, upper default max_state */
1271         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1272         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1273
1274         if (lower > upper || upper > max_state)
1275                 return -EINVAL;
1276
1277         dev =
1278             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1279         if (!dev)
1280                 return -ENOMEM;
1281         dev->tz = tz;
1282         dev->cdev = cdev;
1283         dev->trip = trip;
1284         dev->upper = upper;
1285         dev->lower = lower;
1286         dev->target = THERMAL_NO_TARGET;
1287         dev->weight = weight;
1288
1289         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1290         if (result)
1291                 goto free_mem;
1292
1293         sprintf(dev->name, "cdev%d", dev->id);
1294         result =
1295             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1296         if (result)
1297                 goto release_idr;
1298
1299         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1300         sysfs_attr_init(&dev->attr.attr);
1301         dev->attr.attr.name = dev->attr_name;
1302         dev->attr.attr.mode = 0444;
1303         dev->attr.show = thermal_cooling_device_trip_point_show;
1304         result = device_create_file(&tz->device, &dev->attr);
1305         if (result)
1306                 goto remove_symbol_link;
1307
1308         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1309         sysfs_attr_init(&dev->weight_attr.attr);
1310         dev->weight_attr.attr.name = dev->weight_attr_name;
1311         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1312         dev->weight_attr.show = thermal_cooling_device_weight_show;
1313         dev->weight_attr.store = thermal_cooling_device_weight_store;
1314         result = device_create_file(&tz->device, &dev->weight_attr);
1315         if (result)
1316                 goto remove_trip_file;
1317
1318         mutex_lock(&tz->lock);
1319         mutex_lock(&cdev->lock);
1320         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1321             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1322                 result = -EEXIST;
1323                 break;
1324         }
1325         if (!result) {
1326                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1327                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1328         }
1329         mutex_unlock(&cdev->lock);
1330         mutex_unlock(&tz->lock);
1331
1332         if (!result)
1333                 return 0;
1334
1335         device_remove_file(&tz->device, &dev->weight_attr);
1336 remove_trip_file:
1337         device_remove_file(&tz->device, &dev->attr);
1338 remove_symbol_link:
1339         sysfs_remove_link(&tz->device.kobj, dev->name);
1340 release_idr:
1341         release_idr(&tz->idr, &tz->lock, dev->id);
1342 free_mem:
1343         kfree(dev);
1344         return result;
1345 }
1346 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1347
1348 /**
1349  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1350  *                                        thermal zone.
1351  * @tz:         pointer to a struct thermal_zone_device.
1352  * @trip:       indicates which trip point the cooling devices is
1353  *              associated with in this thermal zone.
1354  * @cdev:       pointer to a struct thermal_cooling_device.
1355  *
1356  * This interface function unbind a thermal cooling device from the certain
1357  * trip point of a thermal zone device.
1358  * This function is usually called in the thermal zone device .unbind callback.
1359  *
1360  * Return: 0 on success, the proper error value otherwise.
1361  */
1362 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1363                                        int trip,
1364                                        struct thermal_cooling_device *cdev)
1365 {
1366         struct thermal_instance *pos, *next;
1367
1368         mutex_lock(&tz->lock);
1369         mutex_lock(&cdev->lock);
1370         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1371                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1372                         list_del(&pos->tz_node);
1373                         list_del(&pos->cdev_node);
1374                         mutex_unlock(&cdev->lock);
1375                         mutex_unlock(&tz->lock);
1376                         goto unbind;
1377                 }
1378         }
1379         mutex_unlock(&cdev->lock);
1380         mutex_unlock(&tz->lock);
1381
1382         return -ENODEV;
1383
1384 unbind:
1385         device_remove_file(&tz->device, &pos->weight_attr);
1386         device_remove_file(&tz->device, &pos->attr);
1387         sysfs_remove_link(&tz->device.kobj, pos->name);
1388         release_idr(&tz->idr, &tz->lock, pos->id);
1389         kfree(pos);
1390         return 0;
1391 }
1392 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1393
1394 static void thermal_release(struct device *dev)
1395 {
1396         struct thermal_zone_device *tz;
1397         struct thermal_cooling_device *cdev;
1398
1399         if (!strncmp(dev_name(dev), "thermal_zone",
1400                      sizeof("thermal_zone") - 1)) {
1401                 tz = to_thermal_zone(dev);
1402                 kfree(tz);
1403         } else if(!strncmp(dev_name(dev), "cooling_device",
1404                         sizeof("cooling_device") - 1)){
1405                 cdev = to_cooling_device(dev);
1406                 kfree(cdev);
1407         }
1408 }
1409
1410 static struct class thermal_class = {
1411         .name = "thermal",
1412         .dev_release = thermal_release,
1413 };
1414
1415 /**
1416  * __thermal_cooling_device_register() - register a new thermal cooling device
1417  * @np:         a pointer to a device tree node.
1418  * @type:       the thermal cooling device type.
1419  * @devdata:    device private data.
1420  * @ops:                standard thermal cooling devices callbacks.
1421  *
1422  * This interface function adds a new thermal cooling device (fan/processor/...)
1423  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1424  * to all the thermal zone devices registered at the same time.
1425  * It also gives the opportunity to link the cooling device to a device tree
1426  * node, so that it can be bound to a thermal zone created out of device tree.
1427  *
1428  * Return: a pointer to the created struct thermal_cooling_device or an
1429  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1430  */
1431 static struct thermal_cooling_device *
1432 __thermal_cooling_device_register(struct device_node *np,
1433                                   char *type, void *devdata,
1434                                   const struct thermal_cooling_device_ops *ops)
1435 {
1436         struct thermal_cooling_device *cdev;
1437         int result;
1438
1439         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1440                 return ERR_PTR(-EINVAL);
1441
1442         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1443             !ops->set_cur_state)
1444                 return ERR_PTR(-EINVAL);
1445
1446         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1447         if (!cdev)
1448                 return ERR_PTR(-ENOMEM);
1449
1450         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1451         if (result) {
1452                 kfree(cdev);
1453                 return ERR_PTR(result);
1454         }
1455
1456         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1457         mutex_init(&cdev->lock);
1458         INIT_LIST_HEAD(&cdev->thermal_instances);
1459         cdev->np = np;
1460         cdev->ops = ops;
1461         cdev->updated = false;
1462         cdev->device.class = &thermal_class;
1463         cdev->device.groups = cooling_device_attr_groups;
1464         cdev->devdata = devdata;
1465         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1466         result = device_register(&cdev->device);
1467         if (result) {
1468                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1469                 kfree(cdev);
1470                 return ERR_PTR(result);
1471         }
1472
1473         /* Add 'this' new cdev to the global cdev list */
1474         mutex_lock(&thermal_list_lock);
1475         list_add(&cdev->node, &thermal_cdev_list);
1476         mutex_unlock(&thermal_list_lock);
1477
1478         /* Update binding information for 'this' new cdev */
1479         bind_cdev(cdev);
1480
1481         return cdev;
1482 }
1483
1484 /**
1485  * thermal_cooling_device_register() - register a new thermal cooling device
1486  * @type:       the thermal cooling device type.
1487  * @devdata:    device private data.
1488  * @ops:                standard thermal cooling devices callbacks.
1489  *
1490  * This interface function adds a new thermal cooling device (fan/processor/...)
1491  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1492  * to all the thermal zone devices registered at the same time.
1493  *
1494  * Return: a pointer to the created struct thermal_cooling_device or an
1495  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1496  */
1497 struct thermal_cooling_device *
1498 thermal_cooling_device_register(char *type, void *devdata,
1499                                 const struct thermal_cooling_device_ops *ops)
1500 {
1501         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1502 }
1503 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1504
1505 /**
1506  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1507  * @np:         a pointer to a device tree node.
1508  * @type:       the thermal cooling device type.
1509  * @devdata:    device private data.
1510  * @ops:                standard thermal cooling devices callbacks.
1511  *
1512  * This function will register a cooling device with device tree node reference.
1513  * This interface function adds a new thermal cooling device (fan/processor/...)
1514  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1515  * to all the thermal zone devices registered at the same time.
1516  *
1517  * Return: a pointer to the created struct thermal_cooling_device or an
1518  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1519  */
1520 struct thermal_cooling_device *
1521 thermal_of_cooling_device_register(struct device_node *np,
1522                                    char *type, void *devdata,
1523                                    const struct thermal_cooling_device_ops *ops)
1524 {
1525         return __thermal_cooling_device_register(np, type, devdata, ops);
1526 }
1527 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1528
1529 /**
1530  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1531  * @cdev:       the thermal cooling device to remove.
1532  *
1533  * thermal_cooling_device_unregister() must be called when the device is no
1534  * longer needed.
1535  */
1536 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1537 {
1538         int i;
1539         const struct thermal_zone_params *tzp;
1540         struct thermal_zone_device *tz;
1541         struct thermal_cooling_device *pos = NULL;
1542
1543         if (!cdev)
1544                 return;
1545
1546         mutex_lock(&thermal_list_lock);
1547         list_for_each_entry(pos, &thermal_cdev_list, node)
1548             if (pos == cdev)
1549                 break;
1550         if (pos != cdev) {
1551                 /* thermal cooling device not found */
1552                 mutex_unlock(&thermal_list_lock);
1553                 return;
1554         }
1555         list_del(&cdev->node);
1556
1557         /* Unbind all thermal zones associated with 'this' cdev */
1558         list_for_each_entry(tz, &thermal_tz_list, node) {
1559                 if (tz->ops->unbind) {
1560                         tz->ops->unbind(tz, cdev);
1561                         continue;
1562                 }
1563
1564                 if (!tz->tzp || !tz->tzp->tbp)
1565                         continue;
1566
1567                 tzp = tz->tzp;
1568                 for (i = 0; i < tzp->num_tbps; i++) {
1569                         if (tzp->tbp[i].cdev == cdev) {
1570                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1571                                 tzp->tbp[i].cdev = NULL;
1572                         }
1573                 }
1574         }
1575
1576         mutex_unlock(&thermal_list_lock);
1577
1578         if (cdev->type[0])
1579                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1580         device_remove_file(&cdev->device, &dev_attr_max_state);
1581         device_remove_file(&cdev->device, &dev_attr_cur_state);
1582
1583         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1584         device_unregister(&cdev->device);
1585         return;
1586 }
1587 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1588
1589 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1590 {
1591         struct thermal_instance *instance;
1592         unsigned long target = 0;
1593
1594         /* cooling device is updated*/
1595         if (cdev->updated)
1596                 return;
1597
1598         mutex_lock(&cdev->lock);
1599         /* Make sure cdev enters the deepest cooling state */
1600         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1601                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1602                                 instance->tz->id, instance->target);
1603                 if (instance->target == THERMAL_NO_TARGET)
1604                         continue;
1605                 if (instance->target > target)
1606                         target = instance->target;
1607         }
1608         mutex_unlock(&cdev->lock);
1609         cdev->ops->set_cur_state(cdev, target);
1610         cdev->updated = true;
1611         trace_cdev_update(cdev, target);
1612         dev_dbg(&cdev->device, "set to state %lu\n", target);
1613 }
1614 EXPORT_SYMBOL(thermal_cdev_update);
1615
1616 /**
1617  * thermal_notify_framework - Sensor drivers use this API to notify framework
1618  * @tz:         thermal zone device
1619  * @trip:       indicates which trip point has been crossed
1620  *
1621  * This function handles the trip events from sensor drivers. It starts
1622  * throttling the cooling devices according to the policy configured.
1623  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1624  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1625  * The throttling policy is based on the configured platform data; if no
1626  * platform data is provided, this uses the step_wise throttling policy.
1627  */
1628 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1629 {
1630         handle_thermal_trip(tz, trip);
1631 }
1632 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1633
1634 /**
1635  * create_trip_attrs() - create attributes for trip points
1636  * @tz:         the thermal zone device
1637  * @mask:       Writeable trip point bitmap.
1638  *
1639  * helper function to instantiate sysfs entries for every trip
1640  * point and its properties of a struct thermal_zone_device.
1641  *
1642  * Return: 0 on success, the proper error value otherwise.
1643  */
1644 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1645 {
1646         int indx;
1647         int size = sizeof(struct thermal_attr) * tz->trips;
1648
1649         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1650         if (!tz->trip_type_attrs)
1651                 return -ENOMEM;
1652
1653         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1654         if (!tz->trip_temp_attrs) {
1655                 kfree(tz->trip_type_attrs);
1656                 return -ENOMEM;
1657         }
1658
1659         if (tz->ops->get_trip_hyst) {
1660                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1661                 if (!tz->trip_hyst_attrs) {
1662                         kfree(tz->trip_type_attrs);
1663                         kfree(tz->trip_temp_attrs);
1664                         return -ENOMEM;
1665                 }
1666         }
1667
1668
1669         for (indx = 0; indx < tz->trips; indx++) {
1670                 /* create trip type attribute */
1671                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1672                          "trip_point_%d_type", indx);
1673
1674                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1675                 tz->trip_type_attrs[indx].attr.attr.name =
1676                                                 tz->trip_type_attrs[indx].name;
1677                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1678                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1679
1680                 device_create_file(&tz->device,
1681                                    &tz->trip_type_attrs[indx].attr);
1682
1683                 /* create trip temp attribute */
1684                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1685                          "trip_point_%d_temp", indx);
1686
1687                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1688                 tz->trip_temp_attrs[indx].attr.attr.name =
1689                                                 tz->trip_temp_attrs[indx].name;
1690                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1691                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1692                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1693                     mask & (1 << indx)) {
1694                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1695                         tz->trip_temp_attrs[indx].attr.store =
1696                                                         trip_point_temp_store;
1697                 }
1698
1699                 device_create_file(&tz->device,
1700                                    &tz->trip_temp_attrs[indx].attr);
1701
1702                 /* create Optional trip hyst attribute */
1703                 if (!tz->ops->get_trip_hyst)
1704                         continue;
1705                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1706                          "trip_point_%d_hyst", indx);
1707
1708                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1709                 tz->trip_hyst_attrs[indx].attr.attr.name =
1710                                         tz->trip_hyst_attrs[indx].name;
1711                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1712                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1713                 if (tz->ops->set_trip_hyst) {
1714                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1715                         tz->trip_hyst_attrs[indx].attr.store =
1716                                         trip_point_hyst_store;
1717                 }
1718
1719                 device_create_file(&tz->device,
1720                                    &tz->trip_hyst_attrs[indx].attr);
1721         }
1722         return 0;
1723 }
1724
1725 static void remove_trip_attrs(struct thermal_zone_device *tz)
1726 {
1727         int indx;
1728
1729         for (indx = 0; indx < tz->trips; indx++) {
1730                 device_remove_file(&tz->device,
1731                                    &tz->trip_type_attrs[indx].attr);
1732                 device_remove_file(&tz->device,
1733                                    &tz->trip_temp_attrs[indx].attr);
1734                 if (tz->ops->get_trip_hyst)
1735                         device_remove_file(&tz->device,
1736                                   &tz->trip_hyst_attrs[indx].attr);
1737         }
1738         kfree(tz->trip_type_attrs);
1739         kfree(tz->trip_temp_attrs);
1740         kfree(tz->trip_hyst_attrs);
1741 }
1742
1743 /**
1744  * thermal_zone_device_register() - register a new thermal zone device
1745  * @type:       the thermal zone device type
1746  * @trips:      the number of trip points the thermal zone support
1747  * @mask:       a bit string indicating the writeablility of trip points
1748  * @devdata:    private device data
1749  * @ops:        standard thermal zone device callbacks
1750  * @tzp:        thermal zone platform parameters
1751  * @passive_delay: number of milliseconds to wait between polls when
1752  *                 performing passive cooling
1753  * @polling_delay: number of milliseconds to wait between polls when checking
1754  *                 whether trip points have been crossed (0 for interrupt
1755  *                 driven systems)
1756  *
1757  * This interface function adds a new thermal zone device (sensor) to
1758  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1759  * thermal cooling devices registered at the same time.
1760  * thermal_zone_device_unregister() must be called when the device is no
1761  * longer needed. The passive cooling depends on the .get_trend() return value.
1762  *
1763  * Return: a pointer to the created struct thermal_zone_device or an
1764  * in case of error, an ERR_PTR. Caller must check return value with
1765  * IS_ERR*() helpers.
1766  */
1767 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1768         int trips, int mask, void *devdata,
1769         struct thermal_zone_device_ops *ops,
1770         struct thermal_zone_params *tzp,
1771         int passive_delay, int polling_delay)
1772 {
1773         struct thermal_zone_device *tz;
1774         enum thermal_trip_type trip_type;
1775         int result;
1776         int count;
1777         int passive = 0;
1778         struct thermal_governor *governor;
1779
1780         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1781                 return ERR_PTR(-EINVAL);
1782
1783         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1784                 return ERR_PTR(-EINVAL);
1785
1786         if (!ops)
1787                 return ERR_PTR(-EINVAL);
1788
1789         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1790                 return ERR_PTR(-EINVAL);
1791
1792         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1793         if (!tz)
1794                 return ERR_PTR(-ENOMEM);
1795
1796         INIT_LIST_HEAD(&tz->thermal_instances);
1797         idr_init(&tz->idr);
1798         mutex_init(&tz->lock);
1799         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1800         if (result) {
1801                 kfree(tz);
1802                 return ERR_PTR(result);
1803         }
1804
1805         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1806         tz->ops = ops;
1807         tz->tzp = tzp;
1808         tz->device.class = &thermal_class;
1809         tz->devdata = devdata;
1810         tz->trips = trips;
1811         tz->passive_delay = passive_delay;
1812         tz->polling_delay = polling_delay;
1813
1814         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1815         result = device_register(&tz->device);
1816         if (result) {
1817                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1818                 kfree(tz);
1819                 return ERR_PTR(result);
1820         }
1821
1822         /* sys I/F */
1823         if (type) {
1824                 result = device_create_file(&tz->device, &dev_attr_type);
1825                 if (result)
1826                         goto unregister;
1827         }
1828
1829         result = device_create_file(&tz->device, &dev_attr_temp);
1830         if (result)
1831                 goto unregister;
1832
1833         if (ops->get_mode) {
1834                 result = device_create_file(&tz->device, &dev_attr_mode);
1835                 if (result)
1836                         goto unregister;
1837         }
1838
1839         result = create_trip_attrs(tz, mask);
1840         if (result)
1841                 goto unregister;
1842
1843         for (count = 0; count < trips; count++) {
1844                 tz->ops->get_trip_type(tz, count, &trip_type);
1845                 if (trip_type == THERMAL_TRIP_PASSIVE)
1846                         passive = 1;
1847         }
1848
1849         if (!passive) {
1850                 result = device_create_file(&tz->device, &dev_attr_passive);
1851                 if (result)
1852                         goto unregister;
1853         }
1854
1855         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1856                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1857                 if (result)
1858                         goto unregister;
1859         }
1860
1861         /* Create policy attribute */
1862         result = device_create_file(&tz->device, &dev_attr_policy);
1863         if (result)
1864                 goto unregister;
1865
1866         /* Add thermal zone params */
1867         result = create_tzp_attrs(&tz->device);
1868         if (result)
1869                 goto unregister;
1870
1871         /* Create available_policies attribute */
1872         result = device_create_file(&tz->device, &dev_attr_available_policies);
1873         if (result)
1874                 goto unregister;
1875
1876         /* Update 'this' zone's governor information */
1877         mutex_lock(&thermal_governor_lock);
1878
1879         if (tz->tzp)
1880                 governor = __find_governor(tz->tzp->governor_name);
1881         else
1882                 governor = def_governor;
1883
1884         result = thermal_set_governor(tz, governor);
1885         if (result) {
1886                 mutex_unlock(&thermal_governor_lock);
1887                 goto unregister;
1888         }
1889
1890         mutex_unlock(&thermal_governor_lock);
1891
1892         if (!tz->tzp || !tz->tzp->no_hwmon) {
1893                 result = thermal_add_hwmon_sysfs(tz);
1894                 if (result)
1895                         goto unregister;
1896         }
1897
1898         mutex_lock(&thermal_list_lock);
1899         list_add_tail(&tz->node, &thermal_tz_list);
1900         mutex_unlock(&thermal_list_lock);
1901
1902         /* Bind cooling devices for this zone */
1903         bind_tz(tz);
1904
1905         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1906
1907         thermal_zone_device_update(tz);
1908
1909         return tz;
1910
1911 unregister:
1912         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1913         device_unregister(&tz->device);
1914         return ERR_PTR(result);
1915 }
1916 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1917
1918 /**
1919  * thermal_device_unregister - removes the registered thermal zone device
1920  * @tz: the thermal zone device to remove
1921  */
1922 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1923 {
1924         int i;
1925         const struct thermal_zone_params *tzp;
1926         struct thermal_cooling_device *cdev;
1927         struct thermal_zone_device *pos = NULL;
1928
1929         if (!tz)
1930                 return;
1931
1932         tzp = tz->tzp;
1933
1934         mutex_lock(&thermal_list_lock);
1935         list_for_each_entry(pos, &thermal_tz_list, node)
1936             if (pos == tz)
1937                 break;
1938         if (pos != tz) {
1939                 /* thermal zone device not found */
1940                 mutex_unlock(&thermal_list_lock);
1941                 return;
1942         }
1943         list_del(&tz->node);
1944
1945         /* Unbind all cdevs associated with 'this' thermal zone */
1946         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1947                 if (tz->ops->unbind) {
1948                         tz->ops->unbind(tz, cdev);
1949                         continue;
1950                 }
1951
1952                 if (!tzp || !tzp->tbp)
1953                         break;
1954
1955                 for (i = 0; i < tzp->num_tbps; i++) {
1956                         if (tzp->tbp[i].cdev == cdev) {
1957                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1958                                 tzp->tbp[i].cdev = NULL;
1959                         }
1960                 }
1961         }
1962
1963         mutex_unlock(&thermal_list_lock);
1964
1965         thermal_zone_device_set_polling(tz, 0);
1966
1967         if (tz->type[0])
1968                 device_remove_file(&tz->device, &dev_attr_type);
1969         device_remove_file(&tz->device, &dev_attr_temp);
1970         if (tz->ops->get_mode)
1971                 device_remove_file(&tz->device, &dev_attr_mode);
1972         device_remove_file(&tz->device, &dev_attr_policy);
1973         device_remove_file(&tz->device, &dev_attr_available_policies);
1974         remove_trip_attrs(tz);
1975         thermal_set_governor(tz, NULL);
1976
1977         thermal_remove_hwmon_sysfs(tz);
1978         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1979         idr_destroy(&tz->idr);
1980         mutex_destroy(&tz->lock);
1981         device_unregister(&tz->device);
1982         return;
1983 }
1984 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1985
1986 /**
1987  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1988  * @name: thermal zone name to fetch the temperature
1989  *
1990  * When only one zone is found with the passed name, returns a reference to it.
1991  *
1992  * Return: On success returns a reference to an unique thermal zone with
1993  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1994  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1995  */
1996 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1997 {
1998         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1999         unsigned int found = 0;
2000
2001         if (!name)
2002                 goto exit;
2003
2004         mutex_lock(&thermal_list_lock);
2005         list_for_each_entry(pos, &thermal_tz_list, node)
2006                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2007                         found++;
2008                         ref = pos;
2009                 }
2010         mutex_unlock(&thermal_list_lock);
2011
2012         /* nothing has been found, thus an error code for it */
2013         if (found == 0)
2014                 ref = ERR_PTR(-ENODEV);
2015         else if (found > 1)
2016         /* Success only when an unique zone is found */
2017                 ref = ERR_PTR(-EEXIST);
2018
2019 exit:
2020         return ref;
2021 }
2022 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2023
2024 #ifdef CONFIG_NET
2025 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2026         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2027 };
2028
2029 static struct genl_family thermal_event_genl_family = {
2030         .id = GENL_ID_GENERATE,
2031         .name = THERMAL_GENL_FAMILY_NAME,
2032         .version = THERMAL_GENL_VERSION,
2033         .maxattr = THERMAL_GENL_ATTR_MAX,
2034         .mcgrps = thermal_event_mcgrps,
2035         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2036 };
2037
2038 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2039                                         enum events event)
2040 {
2041         struct sk_buff *skb;
2042         struct nlattr *attr;
2043         struct thermal_genl_event *thermal_event;
2044         void *msg_header;
2045         int size;
2046         int result;
2047         static unsigned int thermal_event_seqnum;
2048
2049         if (!tz)
2050                 return -EINVAL;
2051
2052         /* allocate memory */
2053         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2054                nla_total_size(0);
2055
2056         skb = genlmsg_new(size, GFP_ATOMIC);
2057         if (!skb)
2058                 return -ENOMEM;
2059
2060         /* add the genetlink message header */
2061         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2062                                  &thermal_event_genl_family, 0,
2063                                  THERMAL_GENL_CMD_EVENT);
2064         if (!msg_header) {
2065                 nlmsg_free(skb);
2066                 return -ENOMEM;
2067         }
2068
2069         /* fill the data */
2070         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2071                            sizeof(struct thermal_genl_event));
2072
2073         if (!attr) {
2074                 nlmsg_free(skb);
2075                 return -EINVAL;
2076         }
2077
2078         thermal_event = nla_data(attr);
2079         if (!thermal_event) {
2080                 nlmsg_free(skb);
2081                 return -EINVAL;
2082         }
2083
2084         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2085
2086         thermal_event->orig = tz->id;
2087         thermal_event->event = event;
2088
2089         /* send multicast genetlink message */
2090         genlmsg_end(skb, msg_header);
2091
2092         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2093                                    0, GFP_ATOMIC);
2094         if (result)
2095                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2096
2097         return result;
2098 }
2099 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2100
2101 static int genetlink_init(void)
2102 {
2103         return genl_register_family(&thermal_event_genl_family);
2104 }
2105
2106 static void genetlink_exit(void)
2107 {
2108         genl_unregister_family(&thermal_event_genl_family);
2109 }
2110 #else /* !CONFIG_NET */
2111 static inline int genetlink_init(void) { return 0; }
2112 static inline void genetlink_exit(void) {}
2113 #endif /* !CONFIG_NET */
2114
2115 static int __init thermal_register_governors(void)
2116 {
2117         int result;
2118
2119         result = thermal_gov_step_wise_register();
2120         if (result)
2121                 return result;
2122
2123         result = thermal_gov_fair_share_register();
2124         if (result)
2125                 return result;
2126
2127         result = thermal_gov_bang_bang_register();
2128         if (result)
2129                 return result;
2130
2131         result = thermal_gov_user_space_register();
2132         if (result)
2133                 return result;
2134
2135         return thermal_gov_power_allocator_register();
2136 }
2137
2138 static void thermal_unregister_governors(void)
2139 {
2140         thermal_gov_step_wise_unregister();
2141         thermal_gov_fair_share_unregister();
2142         thermal_gov_bang_bang_unregister();
2143         thermal_gov_user_space_unregister();
2144         thermal_gov_power_allocator_unregister();
2145 }
2146
2147 static int __init thermal_init(void)
2148 {
2149         int result;
2150
2151         result = thermal_register_governors();
2152         if (result)
2153                 goto error;
2154
2155         result = class_register(&thermal_class);
2156         if (result)
2157                 goto unregister_governors;
2158
2159         result = genetlink_init();
2160         if (result)
2161                 goto unregister_class;
2162
2163         result = of_parse_thermal_zones();
2164         if (result)
2165                 goto exit_netlink;
2166
2167         return 0;
2168
2169 exit_netlink:
2170         genetlink_exit();
2171 unregister_class:
2172         class_unregister(&thermal_class);
2173 unregister_governors:
2174         thermal_unregister_governors();
2175 error:
2176         idr_destroy(&thermal_tz_idr);
2177         idr_destroy(&thermal_cdev_idr);
2178         mutex_destroy(&thermal_idr_lock);
2179         mutex_destroy(&thermal_list_lock);
2180         mutex_destroy(&thermal_governor_lock);
2181         return result;
2182 }
2183
2184 static void __exit thermal_exit(void)
2185 {
2186         of_thermal_destroy_zones();
2187         genetlink_exit();
2188         class_unregister(&thermal_class);
2189         thermal_unregister_governors();
2190         idr_destroy(&thermal_tz_idr);
2191         idr_destroy(&thermal_cdev_idr);
2192         mutex_destroy(&thermal_idr_lock);
2193         mutex_destroy(&thermal_list_lock);
2194         mutex_destroy(&thermal_governor_lock);
2195 }
2196
2197 fs_initcall(thermal_init);
2198 module_exit(thermal_exit);