kernel/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 #include <linux/suspend.h>
  41
  42 #define CREATE_TRACE_POINTS
  43 #include <trace/events/thermal.h>
  44
  45 #include "thermal_core.h"
  46 #include "thermal_hwmon.h"
  47
  48 MODULE_AUTHOR("Zhang Rui");
  49 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  50 MODULE_LICENSE("GPL v2");
  51
  52 static DEFINE_IDR(thermal_tz_idr);
  53 static DEFINE_IDR(thermal_cdev_idr);
  54 static DEFINE_MUTEX(thermal_idr_lock);
  55
  56 static LIST_HEAD(thermal_tz_list);
  57 static LIST_HEAD(thermal_cdev_list);
  58 static LIST_HEAD(thermal_governor_list);
  59
  60 static DEFINE_MUTEX(thermal_list_lock);
  61 static DEFINE_MUTEX(thermal_governor_lock);
  62
  63 static atomic_t in_suspend;
  64
  65 static struct thermal_governor *def_governor;
  66
  67 static struct thermal_governor *__find_governor(const char *name)
  68 {
  69         struct thermal_governor *pos;
  70
  71         if (!name || !name[0])
  72                 return def_governor;
  73
  74         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  75                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  76                         return pos;
  77
  78         return NULL;
  79 }
  80
  81 /**
  82  * bind_previous_governor() - bind the previous governor of the thermal zone
  83  * @tz:         a valid pointer to a struct thermal_zone_device
  84  * @failed_gov_name:    the name of the governor that failed to register
  85  *
  86  * Register the previous governor of the thermal zone after a new
  87  * governor has failed to be bound.
  88  */
  89 static void bind_previous_governor(struct thermal_zone_device *tz,
  90                                    const char *failed_gov_name)
  91 {
  92         if (tz->governor && tz->governor->bind_to_tz) {
  93                 if (tz->governor->bind_to_tz(tz)) {
  94                         dev_err(&tz->device,
  95                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  96                                 failed_gov_name, tz->governor->name, tz->type);
  97                         tz->governor = NULL;
  98                 }
  99         }
 100 }
 101
 102 /**
 103  * thermal_set_governor() - Switch to another governor
 104  * @tz:         a valid pointer to a struct thermal_zone_device
 105  * @new_gov:    pointer to the new governor
 106  *
 107  * Change the governor of thermal zone @tz.
 108  *
 109  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
 110  */
 111 static int thermal_set_governor(struct thermal_zone_device *tz,
 112                                 struct thermal_governor *new_gov)
 113 {
 114         int ret = 0;
 115
 116         if (tz->governor && tz->governor->unbind_from_tz)
 117                 tz->governor->unbind_from_tz(tz);
 118
 119         if (new_gov && new_gov->bind_to_tz) {
 120                 ret = new_gov->bind_to_tz(tz);
 121                 if (ret) {
 122                         bind_previous_governor(tz, new_gov->name);
 123
 124                         return ret;
 125                 }
 126         }
 127
 128         tz->governor = new_gov;
 129
 130         return ret;
 131 }
 132
 133 int thermal_register_governor(struct thermal_governor *governor)
 134 {
 135         int err;
 136         const char *name;
 137         struct thermal_zone_device *pos;
 138
 139         if (!governor)
 140                 return -EINVAL;
 141
 142         mutex_lock(&thermal_governor_lock);
 143
 144         err = -EBUSY;
 145         if (__find_governor(governor->name) == NULL) {
 146                 err = 0;
 147                 list_add(&governor->governor_list, &thermal_governor_list);
 148                 if (!def_governor && !strncmp(governor->name,
 149                         DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
 150                         def_governor = governor;
 151         }
 152
 153         mutex_lock(&thermal_list_lock);
 154
 155         list_for_each_entry(pos, &thermal_tz_list, node) {
 156                 /*
 157                  * only thermal zones with specified tz->tzp->governor_name
 158                  * may run with tz->govenor unset
 159                  */
 160                 if (pos->governor)
 161                         continue;
 162
 163                 name = pos->tzp->governor_name;
 164
 165                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 166                         int ret;
 167
 168                         ret = thermal_set_governor(pos, governor);
 169                         if (ret)
 170                                 dev_err(&pos->device,
 171                                         "Failed to set governor %s for thermal zone %s: %d\n",
 172                                         governor->name, pos->type, ret);
 173                 }
 174         }
 175
 176         mutex_unlock(&thermal_list_lock);
 177         mutex_unlock(&thermal_governor_lock);
 178
 179         return err;
 180 }
 181
 182 void thermal_unregister_governor(struct thermal_governor *governor)
 183 {
 184         struct thermal_zone_device *pos;
 185
 186         if (!governor)
 187                 return;
 188
 189         mutex_lock(&thermal_governor_lock);
 190
 191         if (__find_governor(governor->name) == NULL)
 192                 goto exit;
 193
 194         mutex_lock(&thermal_list_lock);
 195
 196         list_for_each_entry(pos, &thermal_tz_list, node) {
 197                 if (!strncasecmp(pos->governor->name, governor->name,
 198                                                 THERMAL_NAME_LENGTH))
 199                         thermal_set_governor(pos, NULL);
 200         }
 201
 202         mutex_unlock(&thermal_list_lock);
 203         list_del(&governor->governor_list);
 204 exit:
 205         mutex_unlock(&thermal_governor_lock);
 206         return;
 207 }
 208
 209 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 210 {
 211         int ret;
 212
 213         if (lock)
 214                 mutex_lock(lock);
 215         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 216         if (lock)
 217                 mutex_unlock(lock);
 218         if (unlikely(ret < 0))
 219                 return ret;
 220         *id = ret;
 221         return 0;
 222 }
 223
 224 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 225 {
 226         if (lock)
 227                 mutex_lock(lock);
 228         idr_remove(idr, id);
 229         if (lock)
 230                 mutex_unlock(lock);
 231 }
 232
 233 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 234 {
 235         enum thermal_trend trend;
 236
 237         if (tz->emul_temperature || !tz->ops->get_trend ||
 238             tz->ops->get_trend(tz, trip, &trend)) {
 239                 if (tz->temperature > tz->last_temperature)
 240                         trend = THERMAL_TREND_RAISING;
 241                 else if (tz->temperature < tz->last_temperature)
 242                         trend = THERMAL_TREND_DROPPING;
 243                 else
 244                         trend = THERMAL_TREND_STABLE;
 245         }
 246
 247         return trend;
 248 }
 249 EXPORT_SYMBOL(get_tz_trend);
 250
 251 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 252                         struct thermal_cooling_device *cdev, int trip)
 253 {
 254         struct thermal_instance *pos = NULL;
 255         struct thermal_instance *target_instance = NULL;
 256
 257         mutex_lock(&tz->lock);
 258         mutex_lock(&cdev->lock);
 259
 260         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 261                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 262                         target_instance = pos;
 263                         break;
 264                 }
 265         }
 266
 267         mutex_unlock(&cdev->lock);
 268         mutex_unlock(&tz->lock);
 269
 270         return target_instance;
 271 }
 272 EXPORT_SYMBOL(get_thermal_instance);
 273
 274 static void print_bind_err_msg(struct thermal_zone_device *tz,
 275                         struct thermal_cooling_device *cdev, int ret)
 276 {
 277         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 278                                 tz->type, cdev->type, ret);
 279 }
 280
 281 static void __bind(struct thermal_zone_device *tz, int mask,
 282                         struct thermal_cooling_device *cdev,
 283                         unsigned long *limits,
 284                         unsigned int weight)
 285 {
 286         int i, ret;
 287
 288         for (i = 0; i < tz->trips; i++) {
 289                 if (mask & (1 << i)) {
 290                         unsigned long upper, lower;
 291
 292                         upper = THERMAL_NO_LIMIT;
 293                         lower = THERMAL_NO_LIMIT;
 294                         if (limits) {
 295                                 lower = limits[i * 2];
 296                                 upper = limits[i * 2 + 1];
 297                         }
 298                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 299                                                                upper, lower,
 300                                                                weight);
 301                         if (ret)
 302                                 print_bind_err_msg(tz, cdev, ret);
 303                 }
 304         }
 305 }
 306
 307 static void __unbind(struct thermal_zone_device *tz, int mask,
 308                         struct thermal_cooling_device *cdev)
 309 {
 310         int i;
 311
 312         for (i = 0; i < tz->trips; i++)
 313                 if (mask & (1 << i))
 314                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 315 }
 316
 317 static void bind_cdev(struct thermal_cooling_device *cdev)
 318 {
 319         int i, ret;
 320         const struct thermal_zone_params *tzp;
 321         struct thermal_zone_device *pos = NULL;
 322
 323         mutex_lock(&thermal_list_lock);
 324
 325         list_for_each_entry(pos, &thermal_tz_list, node) {
 326                 if (!pos->tzp && !pos->ops->bind)
 327                         continue;
 328
 329                 if (pos->ops->bind) {
 330                         ret = pos->ops->bind(pos, cdev);
 331                         if (ret)
 332                                 print_bind_err_msg(pos, cdev, ret);
 333                         continue;
 334                 }
 335
 336                 tzp = pos->tzp;
 337                 if (!tzp || !tzp->tbp)
 338                         continue;
 339
 340                 for (i = 0; i < tzp->num_tbps; i++) {
 341                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 342                                 continue;
 343                         if (tzp->tbp[i].match(pos, cdev))
 344                                 continue;
 345                         tzp->tbp[i].cdev = cdev;
 346                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 347                                tzp->tbp[i].binding_limits,
 348                                tzp->tbp[i].weight);
 349                 }
 350         }
 351
 352         mutex_unlock(&thermal_list_lock);
 353 }
 354
 355 static void bind_tz(struct thermal_zone_device *tz)
 356 {
 357         int i, ret;
 358         struct thermal_cooling_device *pos = NULL;
 359         const struct thermal_zone_params *tzp = tz->tzp;
 360
 361         if (!tzp && !tz->ops->bind)
 362                 return;
 363
 364         mutex_lock(&thermal_list_lock);
 365
 366         /* If there is ops->bind, try to use ops->bind */
 367         if (tz->ops->bind) {
 368                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 369                         ret = tz->ops->bind(tz, pos);
 370                         if (ret)
 371                                 print_bind_err_msg(tz, pos, ret);
 372                 }
 373                 goto exit;
 374         }
 375
 376         if (!tzp || !tzp->tbp)
 377                 goto exit;
 378
 379         list_for_each_entry(pos, &thermal_cdev_list, node) {
 380                 for (i = 0; i < tzp->num_tbps; i++) {
 381                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 382                                 continue;
 383                         if (tzp->tbp[i].match(tz, pos))
 384                                 continue;
 385                         tzp->tbp[i].cdev = pos;
 386                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 387                                tzp->tbp[i].binding_limits,
 388                                tzp->tbp[i].weight);
 389                 }
 390         }
 391 exit:
 392         mutex_unlock(&thermal_list_lock);
 393 }
 394
 395 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 396                                             int delay)
 397 {
 398         if (delay > 1000)
 399                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 400                                  round_jiffies(msecs_to_jiffies(delay)));
 401         else if (delay)
 402                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 403                                  msecs_to_jiffies(delay));
 404         else
 405                 cancel_delayed_work(&tz->poll_queue);
 406 }
 407
 408 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 409 {
 410         mutex_lock(&tz->lock);
 411
 412         if (tz->passive)
 413                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 414         else if (tz->polling_delay)
 415                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 416         else
 417                 thermal_zone_device_set_polling(tz, 0);
 418
 419         mutex_unlock(&tz->lock);
 420 }
 421
 422 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 423                         int trip, enum thermal_trip_type trip_type)
 424 {
 425         tz->governor ? tz->governor->throttle(tz, trip) :
 426                        def_governor->throttle(tz, trip);
 427 }
 428
 429 static void handle_critical_trips(struct thermal_zone_device *tz,
 430                                 int trip, enum thermal_trip_type trip_type)
 431 {
 432         int trip_temp;
 433
 434         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 435
 436         /* If we have not crossed the trip_temp, we do not care. */
 437         if (trip_temp <= 0 || tz->temperature < trip_temp)
 438                 return;
 439
 440         trace_thermal_zone_trip(tz, trip, trip_type);
 441
 442         if (tz->ops->notify)
 443                 tz->ops->notify(tz, trip, trip_type);
 444
 445         if (trip_type == THERMAL_TRIP_CRITICAL) {
 446                 dev_emerg(&tz->device,
 447                           "critical temperature reached(%d C),shutting down\n",
 448                           tz->temperature / 1000);
 449                 orderly_poweroff(true);
 450         }
 451 }
 452
 453 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 454 {
 455         enum thermal_trip_type type;
 456
 457         tz->ops->get_trip_type(tz, trip, &type);
 458
 459         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 460                 handle_critical_trips(tz, trip, type);
 461         else
 462                 handle_non_critical_trips(tz, trip, type);
 463         /*
 464          * Alright, we handled this trip successfully.
 465          * So, start monitoring again.
 466          */
 467         monitor_thermal_zone(tz);
 468 }
 469
 470 /**
 471  * thermal_zone_get_temp() - returns the temperature of a thermal zone
 472  * @tz: a valid pointer to a struct thermal_zone_device
 473  * @temp: a valid pointer to where to store the resulting temperature.
 474  *
 475  * When a valid thermal zone reference is passed, it will fetch its
 476  * temperature and fill @temp.
 477  *
 478  * Return: On success returns 0, an error code otherwise
 479  */
 480 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 481 {
 482         int ret = -EINVAL;
 483         int count;
 484         int crit_temp = INT_MAX;
 485         enum thermal_trip_type type;
 486
 487         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 488                 goto exit;
 489
 490         mutex_lock(&tz->lock);
 491
 492         ret = tz->ops->get_temp(tz, temp);
 493
 494         if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 495                 for (count = 0; count < tz->trips; count++) {
 496                         ret = tz->ops->get_trip_type(tz, count, &type);
 497                         if (!ret && type == THERMAL_TRIP_CRITICAL) {
 498                                 ret = tz->ops->get_trip_temp(tz, count,
 499                                                 &crit_temp);
 500                                 break;
 501                         }
 502                 }
 503
 504                 /*
 505                  * Only allow emulating a temperature when the real temperature
 506                  * is below the critical temperature so that the emulation code
 507                  * cannot hide critical conditions.
 508                  */
 509                 if (!ret && *temp < crit_temp)
 510                         *temp = tz->emul_temperature;
 511         }
 512
 513         mutex_unlock(&tz->lock);
 514 exit:
 515         return ret;
 516 }
 517 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 518
 519 static void update_temperature(struct thermal_zone_device *tz)
 520 {
 521         int temp, ret;
 522
 523         ret = thermal_zone_get_temp(tz, &temp);
 524         if (ret) {
 525                 if (ret != -EAGAIN)
 526                         dev_warn(&tz->device,
 527                                  "failed to read out thermal zone (%d)\n",
 528                                  ret);
 529                 return;
 530         }
 531
 532         mutex_lock(&tz->lock);
 533         tz->last_temperature = tz->temperature;
 534         tz->temperature = temp;
 535         mutex_unlock(&tz->lock);
 536
 537         trace_thermal_temperature(tz);
 538         if (tz->last_temperature == THERMAL_TEMP_INVALID)
 539                 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
 540                         tz->temperature);
 541         else
 542                 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 543                         tz->last_temperature, tz->temperature);
 544 }
 545
 546 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 547 {
 548         struct thermal_instance *pos;
 549
 550         tz->temperature = THERMAL_TEMP_INVALID;
 551         tz->passive = 0;
 552         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 553                 pos->initialized = false;
 554 }
 555
 556 void thermal_zone_device_update(struct thermal_zone_device *tz)
 557 {
 558         int count;
 559
 560         if (atomic_read(&in_suspend))
 561                 return;
 562
 563         if (!tz->ops->get_temp)
 564                 return;
 565
 566         update_temperature(tz);
 567
 568         for (count = 0; count < tz->trips; count++)
 569                 handle_thermal_trip(tz, count);
 570 }
 571 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 572
 573 static void thermal_zone_device_check(struct work_struct *work)
 574 {
 575         struct thermal_zone_device *tz = container_of(work, struct
 576                                                       thermal_zone_device,
 577                                                       poll_queue.work);
 578         thermal_zone_device_update(tz);
 579 }
 580
 581 /* sys I/F for thermal zone */
 582
 583 #define to_thermal_zone(_dev) \
 584         container_of(_dev, struct thermal_zone_device, device)
 585
 586 static ssize_t
 587 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 588 {
 589         struct thermal_zone_device *tz = to_thermal_zone(dev);
 590
 591         return sprintf(buf, "%s\n", tz->type);
 592 }
 593
 594 static ssize_t
 595 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 596 {
 597         struct thermal_zone_device *tz = to_thermal_zone(dev);
 598         int temperature, ret;
 599
 600         ret = thermal_zone_get_temp(tz, &temperature);
 601
 602         if (ret)
 603                 return ret;
 604
 605         return sprintf(buf, "%d\n", temperature);
 606 }
 607
 608 static ssize_t
 609 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 610 {
 611         struct thermal_zone_device *tz = to_thermal_zone(dev);
 612         enum thermal_device_mode mode;
 613         int result;
 614
 615         if (!tz->ops->get_mode)
 616                 return -EPERM;
 617
 618         result = tz->ops->get_mode(tz, &mode);
 619         if (result)
 620                 return result;
 621
 622         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 623                        : "disabled");
 624 }
 625
 626 static ssize_t
 627 mode_store(struct device *dev, struct device_attribute *attr,
 628            const char *buf, size_t count)
 629 {
 630         struct thermal_zone_device *tz = to_thermal_zone(dev);
 631         int result;
 632
 633         if (!tz->ops->set_mode)
 634                 return -EPERM;
 635
 636         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 637                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 638         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 639                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 640         else
 641                 result = -EINVAL;
 642
 643         if (result)
 644                 return result;
 645
 646         return count;
 647 }
 648
 649 static ssize_t
 650 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 651                      char *buf)
 652 {
 653         struct thermal_zone_device *tz = to_thermal_zone(dev);
 654         enum thermal_trip_type type;
 655         int trip, result;
 656
 657         if (!tz->ops->get_trip_type)
 658                 return -EPERM;
 659
 660         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 661                 return -EINVAL;
 662
 663         result = tz->ops->get_trip_type(tz, trip, &type);
 664         if (result)
 665                 return result;
 666
 667         switch (type) {
 668         case THERMAL_TRIP_CRITICAL:
 669                 return sprintf(buf, "critical\n");
 670         case THERMAL_TRIP_HOT:
 671                 return sprintf(buf, "hot\n");
 672         case THERMAL_TRIP_PASSIVE:
 673                 return sprintf(buf, "passive\n");
 674         case THERMAL_TRIP_ACTIVE:
 675                 return sprintf(buf, "active\n");
 676         default:
 677                 return sprintf(buf, "unknown\n");
 678         }
 679 }
 680
 681 static ssize_t
 682 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 683                      const char *buf, size_t count)
 684 {
 685         struct thermal_zone_device *tz = to_thermal_zone(dev);
 686         int trip, ret;
 687         unsigned long temperature;
 688
 689         if (!tz->ops->set_trip_temp)
 690                 return -EPERM;
 691
 692         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 693                 return -EINVAL;
 694
 695         if (kstrtoul(buf, 10, &temperature))
 696                 return -EINVAL;
 697
 698         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 699
 700         return ret ? ret : count;
 701 }
 702
 703 static ssize_t
 704 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 705                      char *buf)
 706 {
 707         struct thermal_zone_device *tz = to_thermal_zone(dev);
 708         int trip, ret;
 709         int temperature;
 710
 711         if (!tz->ops->get_trip_temp)
 712                 return -EPERM;
 713
 714         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 715                 return -EINVAL;
 716
 717         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 718
 719         if (ret)
 720                 return ret;
 721
 722         return sprintf(buf, "%d\n", temperature);
 723 }
 724
 725 static ssize_t
 726 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 727                         const char *buf, size_t count)
 728 {
 729         struct thermal_zone_device *tz = to_thermal_zone(dev);
 730         int trip, ret;
 731         int temperature;
 732
 733         if (!tz->ops->set_trip_hyst)
 734                 return -EPERM;
 735
 736         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 737                 return -EINVAL;
 738
 739         if (kstrtoint(buf, 10, &temperature))
 740                 return -EINVAL;
 741
 742         /*
 743          * We are not doing any check on the 'temperature' value
 744          * here. The driver implementing 'set_trip_hyst' has to
 745          * take care of this.
 746          */
 747         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 748
 749         return ret ? ret : count;
 750 }
 751
 752 static ssize_t
 753 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 754                         char *buf)
 755 {
 756         struct thermal_zone_device *tz = to_thermal_zone(dev);
 757         int trip, ret;
 758         int temperature;
 759
 760         if (!tz->ops->get_trip_hyst)
 761                 return -EPERM;
 762
 763         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 764                 return -EINVAL;
 765
 766         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 767
 768         return ret ? ret : sprintf(buf, "%d\n", temperature);
 769 }
 770
 771 static ssize_t
 772 passive_store(struct device *dev, struct device_attribute *attr,
 773                     const char *buf, size_t count)
 774 {
 775         struct thermal_zone_device *tz = to_thermal_zone(dev);
 776         struct thermal_cooling_device *cdev = NULL;
 777         int state;
 778
 779         if (!sscanf(buf, "%d\n", &state))
 780                 return -EINVAL;
 781
 782         /* sanity check: values below 1000 millicelcius don't make sense
 783          * and can cause the system to go into a thermal heart attack
 784          */
 785         if (state && state < 1000)
 786                 return -EINVAL;
 787
 788         if (state && !tz->forced_passive) {
 789                 mutex_lock(&thermal_list_lock);
 790                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 791                         if (!strncmp("Processor", cdev->type,
 792                                      sizeof("Processor")))
 793                                 thermal_zone_bind_cooling_device(tz,
 794                                                 THERMAL_TRIPS_NONE, cdev,
 795                                                 THERMAL_NO_LIMIT,
 796                                                 THERMAL_NO_LIMIT,
 797                                                 THERMAL_WEIGHT_DEFAULT);
 798                 }
 799                 mutex_unlock(&thermal_list_lock);
 800                 if (!tz->passive_delay)
 801                         tz->passive_delay = 1000;
 802         } else if (!state && tz->forced_passive) {
 803                 mutex_lock(&thermal_list_lock);
 804                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 805                         if (!strncmp("Processor", cdev->type,
 806                                      sizeof("Processor")))
 807                                 thermal_zone_unbind_cooling_device(tz,
 808                                                                    THERMAL_TRIPS_NONE,
 809                                                                    cdev);
 810                 }
 811                 mutex_unlock(&thermal_list_lock);
 812                 tz->passive_delay = 0;
 813         }
 814
 815         tz->forced_passive = state;
 816
 817         thermal_zone_device_update(tz);
 818
 819         return count;
 820 }
 821
 822 static ssize_t
 823 passive_show(struct device *dev, struct device_attribute *attr,
 824                    char *buf)
 825 {
 826         struct thermal_zone_device *tz = to_thermal_zone(dev);
 827
 828         return sprintf(buf, "%d\n", tz->forced_passive);
 829 }
 830
 831 static ssize_t
 832 policy_store(struct device *dev, struct device_attribute *attr,
 833                     const char *buf, size_t count)
 834 {
 835         int ret = -EINVAL;
 836         struct thermal_zone_device *tz = to_thermal_zone(dev);
 837         struct thermal_governor *gov;
 838         char name[THERMAL_NAME_LENGTH];
 839
 840         snprintf(name, sizeof(name), "%s", buf);
 841
 842         mutex_lock(&thermal_governor_lock);
 843         mutex_lock(&tz->lock);
 844
 845         gov = __find_governor(strim(name));
 846         if (!gov)
 847                 goto exit;
 848
 849         ret = thermal_set_governor(tz, gov);
 850         if (!ret)
 851                 ret = count;
 852
 853 exit:
 854         mutex_unlock(&tz->lock);
 855         mutex_unlock(&thermal_governor_lock);
 856         return ret;
 857 }
 858
 859 static ssize_t
 860 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 861 {
 862         struct thermal_zone_device *tz = to_thermal_zone(dev);
 863
 864         return sprintf(buf, "%s\n", tz->governor->name);
 865 }
 866
 867 static ssize_t
 868 available_policies_show(struct device *dev, struct device_attribute *devattr,
 869                         char *buf)
 870 {
 871         struct thermal_governor *pos;
 872         ssize_t count = 0;
 873         ssize_t size = PAGE_SIZE;
 874
 875         mutex_lock(&thermal_governor_lock);
 876
 877         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 878                 size = PAGE_SIZE - count;
 879                 count += scnprintf(buf + count, size, "%s ", pos->name);
 880         }
 881         count += scnprintf(buf + count, size, "\n");
 882
 883         mutex_unlock(&thermal_governor_lock);
 884
 885         return count;
 886 }
 887
 888 static ssize_t
 889 emul_temp_store(struct device *dev, struct device_attribute *attr,
 890                      const char *buf, size_t count)
 891 {
 892         struct thermal_zone_device *tz = to_thermal_zone(dev);
 893         int ret = 0;
 894         unsigned long temperature;
 895
 896         if (kstrtoul(buf, 10, &temperature))
 897                 return -EINVAL;
 898
 899         if (!tz->ops->set_emul_temp) {
 900                 mutex_lock(&tz->lock);
 901                 tz->emul_temperature = temperature;
 902                 mutex_unlock(&tz->lock);
 903         } else {
 904                 ret = tz->ops->set_emul_temp(tz, temperature);
 905         }
 906
 907         if (!ret)
 908                 thermal_zone_device_update(tz);
 909
 910         return ret ? ret : count;
 911 }
 912 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 913
 914 static ssize_t
 915 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 916                        char *buf)
 917 {
 918         struct thermal_zone_device *tz = to_thermal_zone(dev);
 919
 920         if (tz->tzp)
 921                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 922         else
 923                 return -EIO;
 924 }
 925
 926 static ssize_t
 927 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 928                         const char *buf, size_t count)
 929 {
 930         struct thermal_zone_device *tz = to_thermal_zone(dev);
 931         u32 sustainable_power;
 932
 933         if (!tz->tzp)
 934                 return -EIO;
 935
 936         if (kstrtou32(buf, 10, &sustainable_power))
 937                 return -EINVAL;
 938
 939         tz->tzp->sustainable_power = sustainable_power;
 940
 941         return count;
 942 }
 943 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 944                 sustainable_power_store);
 945
 946 #define create_s32_tzp_attr(name)                                       \
 947         static ssize_t                                                  \
 948         name##_show(struct device *dev, struct device_attribute *devattr, \
 949                 char *buf)                                              \
 950         {                                                               \
 951         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
 952                                                                         \
 953         if (tz->tzp)                                                    \
 954                 return sprintf(buf, "%u\n", tz->tzp->name);             \
 955         else                                                            \
 956                 return -EIO;                                            \
 957         }                                                               \
 958                                                                         \
 959         static ssize_t                                                  \
 960         name##_store(struct device *dev, struct device_attribute *devattr, \
 961                 const char *buf, size_t count)                          \
 962         {                                                               \
 963                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
 964                 s32 value;                                              \
 965                                                                         \
 966                 if (!tz->tzp)                                           \
 967                         return -EIO;                                    \
 968                                                                         \
 969                 if (kstrtos32(buf, 10, &value))                         \
 970                         return -EINVAL;                                 \
 971                                                                         \
 972                 tz->tzp->name = value;                                  \
 973                                                                         \
 974                 return count;                                           \
 975         }                                                               \
 976         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
 977
 978 create_s32_tzp_attr(k_po);
 979 create_s32_tzp_attr(k_pu);
 980 create_s32_tzp_attr(k_i);
 981 create_s32_tzp_attr(k_d);
 982 create_s32_tzp_attr(integral_cutoff);
 983 create_s32_tzp_attr(slope);
 984 create_s32_tzp_attr(offset);
 985 #undef create_s32_tzp_attr
 986
 987 static struct device_attribute *dev_tzp_attrs[] = {
 988         &dev_attr_sustainable_power,
 989         &dev_attr_k_po,
 990         &dev_attr_k_pu,
 991         &dev_attr_k_i,
 992         &dev_attr_k_d,
 993         &dev_attr_integral_cutoff,
 994         &dev_attr_slope,
 995         &dev_attr_offset,
 996 };
 997
 998 static int create_tzp_attrs(struct device *dev)
 999 {
1000         int i;
1001
1002         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1003                 int ret;
1004                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1005
1006                 ret = device_create_file(dev, dev_attr);
1007                 if (ret)
1008                         return ret;
1009         }
1010
1011         return 0;
1012 }
1013
1014 /**
1015  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1016  * @cdev:       pointer to &thermal_cooling_device
1017  * @tz:         a valid thermal zone device pointer
1018  * @max_power:  pointer in which to store the maximum power
1019  *
1020  * Calculate the maximum power consumption in milliwats that the
1021  * cooling device can currently consume and store it in @max_power.
1022  *
1023  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1024  * power_actor API or -E* on other error.
1025  */
1026 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1027                               struct thermal_zone_device *tz, u32 *max_power)
1028 {
1029         if (!cdev_is_power_actor(cdev))
1030                 return -EINVAL;
1031
1032         return cdev->ops->state2power(cdev, tz, 0, max_power);
1033 }
1034
1035 /**
1036  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1037  * @cdev:       pointer to &thermal_cooling_device
1038  * @tz:         a valid thermal zone device pointer
1039  * @min_power:  pointer in which to store the minimum power
1040  *
1041  * Calculate the minimum power consumption in milliwatts that the
1042  * cooling device can currently consume and store it in @min_power.
1043  *
1044  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1045  * power_actor API or -E* on other error.
1046  */
1047 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1048                               struct thermal_zone_device *tz, u32 *min_power)
1049 {
1050         unsigned long max_state;
1051         int ret;
1052
1053         if (!cdev_is_power_actor(cdev))
1054                 return -EINVAL;
1055
1056         ret = cdev->ops->get_max_state(cdev, &max_state);
1057         if (ret)
1058                 return ret;
1059
1060         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1061 }
1062
1063 /**
1064  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1065  * @cdev:       pointer to &thermal_cooling_device
1066  * @instance:   thermal instance to update
1067  * @power:      the power in milliwatts
1068  *
1069  * Set the cooling device to consume at most @power milliwatts.
1070  *
1071  * Return: 0 on success, -EINVAL if the cooling device does not
1072  * implement the power actor API or -E* for other failures.
1073  */
1074 int power_actor_set_power(struct thermal_cooling_device *cdev,
1075                           struct thermal_instance *instance, u32 power)
1076 {
1077         unsigned long state;
1078         int ret;
1079
1080         if (!cdev_is_power_actor(cdev))
1081                 return -EINVAL;
1082
1083         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1084         if (ret)
1085                 return ret;
1086
1087         instance->target = state;
1088         cdev->updated = false;
1089         thermal_cdev_update(cdev);
1090
1091         return 0;
1092 }
1093
1094 static DEVICE_ATTR(type, 0444, type_show, NULL);
1095 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1096 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1097 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1098 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1099 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1100
1101 /* sys I/F for cooling device */
1102 #define to_cooling_device(_dev) \
1103         container_of(_dev, struct thermal_cooling_device, device)
1104
1105 static ssize_t
1106 thermal_cooling_device_type_show(struct device *dev,
1107                                  struct device_attribute *attr, char *buf)
1108 {
1109         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1110
1111         return sprintf(buf, "%s\n", cdev->type);
1112 }
1113
1114 static ssize_t
1115 thermal_cooling_device_max_state_show(struct device *dev,
1116                                       struct device_attribute *attr, char *buf)
1117 {
1118         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1119         unsigned long state;
1120         int ret;
1121
1122         ret = cdev->ops->get_max_state(cdev, &state);
1123         if (ret)
1124                 return ret;
1125         return sprintf(buf, "%ld\n", state);
1126 }
1127
1128 static ssize_t
1129 thermal_cooling_device_cur_state_show(struct device *dev,
1130                                       struct device_attribute *attr, char *buf)
1131 {
1132         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1133         unsigned long state;
1134         int ret;
1135
1136         ret = cdev->ops->get_cur_state(cdev, &state);
1137         if (ret)
1138                 return ret;
1139         return sprintf(buf, "%ld\n", state);
1140 }
1141
1142 static ssize_t
1143 thermal_cooling_device_cur_state_store(struct device *dev,
1144                                        struct device_attribute *attr,
1145                                        const char *buf, size_t count)
1146 {
1147         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1148         unsigned long state;
1149         int result;
1150
1151         if (!sscanf(buf, "%ld\n", &state))
1152                 return -EINVAL;
1153
1154         if ((long)state < 0)
1155                 return -EINVAL;
1156
1157         result = cdev->ops->set_cur_state(cdev, state);
1158         if (result)
1159                 return result;
1160         return count;
1161 }
1162
1163 static struct device_attribute dev_attr_cdev_type =
1164 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1165 static DEVICE_ATTR(max_state, 0444,
1166                    thermal_cooling_device_max_state_show, NULL);
1167 static DEVICE_ATTR(cur_state, 0644,
1168                    thermal_cooling_device_cur_state_show,
1169                    thermal_cooling_device_cur_state_store);
1170
1171 static ssize_t
1172 thermal_cooling_device_trip_point_show(struct device *dev,
1173                                        struct device_attribute *attr, char *buf)
1174 {
1175         struct thermal_instance *instance;
1176
1177         instance =
1178             container_of(attr, struct thermal_instance, attr);
1179
1180         if (instance->trip == THERMAL_TRIPS_NONE)
1181                 return sprintf(buf, "-1\n");
1182         else
1183                 return sprintf(buf, "%d\n", instance->trip);
1184 }
1185
1186 static struct attribute *cooling_device_attrs[] = {
1187         &dev_attr_cdev_type.attr,
1188         &dev_attr_max_state.attr,
1189         &dev_attr_cur_state.attr,
1190         NULL,
1191 };
1192
1193 static const struct attribute_group cooling_device_attr_group = {
1194         .attrs = cooling_device_attrs,
1195 };
1196
1197 static const struct attribute_group *cooling_device_attr_groups[] = {
1198         &cooling_device_attr_group,
1199         NULL,
1200 };
1201
1202 static ssize_t
1203 thermal_cooling_device_weight_show(struct device *dev,
1204                                    struct device_attribute *attr, char *buf)
1205 {
1206         struct thermal_instance *instance;
1207
1208         instance = container_of(attr, struct thermal_instance, weight_attr);
1209
1210         return sprintf(buf, "%d\n", instance->weight);
1211 }
1212
1213 static ssize_t
1214 thermal_cooling_device_weight_store(struct device *dev,
1215                                     struct device_attribute *attr,
1216                                     const char *buf, size_t count)
1217 {
1218         struct thermal_instance *instance;
1219         int ret, weight;
1220
1221         ret = kstrtoint(buf, 0, &weight);
1222         if (ret)
1223                 return ret;
1224
1225         instance = container_of(attr, struct thermal_instance, weight_attr);
1226         instance->weight = weight;
1227
1228         return count;
1229 }
1230 /* Device management */
1231
1232 /**
1233  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1234  * @tz:         pointer to struct thermal_zone_device
1235  * @trip:       indicates which trip point the cooling devices is
1236  *              associated with in this thermal zone.
1237  * @cdev:       pointer to struct thermal_cooling_device
1238  * @upper:      the Maximum cooling state for this trip point.
1239  *              THERMAL_NO_LIMIT means no upper limit,
1240  *              and the cooling device can be in max_state.
1241  * @lower:      the Minimum cooling state can be used for this trip point.
1242  *              THERMAL_NO_LIMIT means no lower limit,
1243  *              and the cooling device can be in cooling state 0.
1244  * @weight:     The weight of the cooling device to be bound to the
1245  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1246  *              default value
1247  *
1248  * This interface function bind a thermal cooling device to the certain trip
1249  * point of a thermal zone device.
1250  * This function is usually called in the thermal zone device .bind callback.
1251  *
1252  * Return: 0 on success, the proper error value otherwise.
1253  */
1254 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1255                                      int trip,
1256                                      struct thermal_cooling_device *cdev,
1257                                      unsigned long upper, unsigned long lower,
1258                                      unsigned int weight)
1259 {
1260         struct thermal_instance *dev;
1261         struct thermal_instance *pos;
1262         struct thermal_zone_device *pos1;
1263         struct thermal_cooling_device *pos2;
1264         unsigned long max_state;
1265         int result, ret;
1266
1267         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1268                 return -EINVAL;
1269
1270         list_for_each_entry(pos1, &thermal_tz_list, node) {
1271                 if (pos1 == tz)
1272                         break;
1273         }
1274         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1275                 if (pos2 == cdev)
1276                         break;
1277         }
1278
1279         if (tz != pos1 || cdev != pos2)
1280                 return -EINVAL;
1281
1282         ret = cdev->ops->get_max_state(cdev, &max_state);
1283         if (ret)
1284                 return ret;
1285
1286         /* lower default 0, upper default max_state */
1287         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1288         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1289
1290         if (lower > upper || upper > max_state)
1291                 return -EINVAL;
1292
1293         dev =
1294             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1295         if (!dev)
1296                 return -ENOMEM;
1297         dev->tz = tz;
1298         dev->cdev = cdev;
1299         dev->trip = trip;
1300         dev->upper = upper;
1301         dev->lower = lower;
1302         dev->target = THERMAL_NO_TARGET;
1303         dev->weight = weight;
1304
1305         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1306         if (result)
1307                 goto free_mem;
1308
1309         sprintf(dev->name, "cdev%d", dev->id);
1310         result =
1311             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1312         if (result)
1313                 goto release_idr;
1314
1315         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1316         sysfs_attr_init(&dev->attr.attr);
1317         dev->attr.attr.name = dev->attr_name;
1318         dev->attr.attr.mode = 0444;
1319         dev->attr.show = thermal_cooling_device_trip_point_show;
1320         result = device_create_file(&tz->device, &dev->attr);
1321         if (result)
1322                 goto remove_symbol_link;
1323
1324         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1325         sysfs_attr_init(&dev->weight_attr.attr);
1326         dev->weight_attr.attr.name = dev->weight_attr_name;
1327         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1328         dev->weight_attr.show = thermal_cooling_device_weight_show;
1329         dev->weight_attr.store = thermal_cooling_device_weight_store;
1330         result = device_create_file(&tz->device, &dev->weight_attr);
1331         if (result)
1332                 goto remove_trip_file;
1333
1334         mutex_lock(&tz->lock);
1335         mutex_lock(&cdev->lock);
1336         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1337             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1338                 result = -EEXIST;
1339                 break;
1340         }
1341         if (!result) {
1342                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1343                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1344                 atomic_set(&tz->need_update, 1);
1345         }
1346         mutex_unlock(&cdev->lock);
1347         mutex_unlock(&tz->lock);
1348
1349         if (!result)
1350                 return 0;
1351
1352         device_remove_file(&tz->device, &dev->weight_attr);
1353 remove_trip_file:
1354         device_remove_file(&tz->device, &dev->attr);
1355 remove_symbol_link:
1356         sysfs_remove_link(&tz->device.kobj, dev->name);
1357 release_idr:
1358         release_idr(&tz->idr, &tz->lock, dev->id);
1359 free_mem:
1360         kfree(dev);
1361         return result;
1362 }
1363 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1364
1365 /**
1366  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1367  *                                        thermal zone.
1368  * @tz:         pointer to a struct thermal_zone_device.
1369  * @trip:       indicates which trip point the cooling devices is
1370  *              associated with in this thermal zone.
1371  * @cdev:       pointer to a struct thermal_cooling_device.
1372  *
1373  * This interface function unbind a thermal cooling device from the certain
1374  * trip point of a thermal zone device.
1375  * This function is usually called in the thermal zone device .unbind callback.
1376  *
1377  * Return: 0 on success, the proper error value otherwise.
1378  */
1379 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1380                                        int trip,
1381                                        struct thermal_cooling_device *cdev)
1382 {
1383         struct thermal_instance *pos, *next;
1384
1385         mutex_lock(&tz->lock);
1386         mutex_lock(&cdev->lock);
1387         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1388                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1389                         list_del(&pos->tz_node);
1390                         list_del(&pos->cdev_node);
1391                         mutex_unlock(&cdev->lock);
1392                         mutex_unlock(&tz->lock);
1393                         goto unbind;
1394                 }
1395         }
1396         mutex_unlock(&cdev->lock);
1397         mutex_unlock(&tz->lock);
1398
1399         return -ENODEV;
1400
1401 unbind:
1402         device_remove_file(&tz->device, &pos->weight_attr);
1403         device_remove_file(&tz->device, &pos->attr);
1404         sysfs_remove_link(&tz->device.kobj, pos->name);
1405         release_idr(&tz->idr, &tz->lock, pos->id);
1406         kfree(pos);
1407         return 0;
1408 }
1409 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1410
1411 static void thermal_release(struct device *dev)
1412 {
1413         struct thermal_zone_device *tz;
1414         struct thermal_cooling_device *cdev;
1415
1416         if (!strncmp(dev_name(dev), "thermal_zone",
1417                      sizeof("thermal_zone") - 1)) {
1418                 tz = to_thermal_zone(dev);
1419                 kfree(tz);
1420         } else if(!strncmp(dev_name(dev), "cooling_device",
1421                         sizeof("cooling_device") - 1)){
1422                 cdev = to_cooling_device(dev);
1423                 kfree(cdev);
1424         }
1425 }
1426
1427 static struct class thermal_class = {
1428         .name = "thermal",
1429         .dev_release = thermal_release,
1430 };
1431
1432 /**
1433  * __thermal_cooling_device_register() - register a new thermal cooling device
1434  * @np:         a pointer to a device tree node.
1435  * @type:       the thermal cooling device type.
1436  * @devdata:    device private data.
1437  * @ops:                standard thermal cooling devices callbacks.
1438  *
1439  * This interface function adds a new thermal cooling device (fan/processor/...)
1440  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1441  * to all the thermal zone devices registered at the same time.
1442  * It also gives the opportunity to link the cooling device to a device tree
1443  * node, so that it can be bound to a thermal zone created out of device tree.
1444  *
1445  * Return: a pointer to the created struct thermal_cooling_device or an
1446  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1447  */
1448 static struct thermal_cooling_device *
1449 __thermal_cooling_device_register(struct device_node *np,
1450                                   char *type, void *devdata,
1451                                   const struct thermal_cooling_device_ops *ops)
1452 {
1453         struct thermal_cooling_device *cdev;
1454         struct thermal_zone_device *pos = NULL;
1455         int result;
1456
1457         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1458                 return ERR_PTR(-EINVAL);
1459
1460         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1461             !ops->set_cur_state)
1462                 return ERR_PTR(-EINVAL);
1463
1464         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1465         if (!cdev)
1466                 return ERR_PTR(-ENOMEM);
1467
1468         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1469         if (result) {
1470                 kfree(cdev);
1471                 return ERR_PTR(result);
1472         }
1473
1474         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1475         mutex_init(&cdev->lock);
1476         INIT_LIST_HEAD(&cdev->thermal_instances);
1477         cdev->np = np;
1478         cdev->ops = ops;
1479         cdev->updated = false;
1480         cdev->device.class = &thermal_class;
1481         cdev->device.groups = cooling_device_attr_groups;
1482         cdev->devdata = devdata;
1483         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1484         result = device_register(&cdev->device);
1485         if (result) {
1486                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1487                 kfree(cdev);
1488                 return ERR_PTR(result);
1489         }
1490
1491         /* Add 'this' new cdev to the global cdev list */
1492         mutex_lock(&thermal_list_lock);
1493         list_add(&cdev->node, &thermal_cdev_list);
1494         mutex_unlock(&thermal_list_lock);
1495
1496         /* Update binding information for 'this' new cdev */
1497         bind_cdev(cdev);
1498
1499         mutex_lock(&thermal_list_lock);
1500         list_for_each_entry(pos, &thermal_tz_list, node)
1501                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1502                         thermal_zone_device_update(pos);
1503         mutex_unlock(&thermal_list_lock);
1504
1505         return cdev;
1506 }
1507
1508 /**
1509  * thermal_cooling_device_register() - register a new thermal cooling device
1510  * @type:       the thermal cooling device type.
1511  * @devdata:    device private data.
1512  * @ops:                standard thermal cooling devices callbacks.
1513  *
1514  * This interface function adds a new thermal cooling device (fan/processor/...)
1515  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1516  * to all the thermal zone devices registered at the same time.
1517  *
1518  * Return: a pointer to the created struct thermal_cooling_device or an
1519  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1520  */
1521 struct thermal_cooling_device *
1522 thermal_cooling_device_register(char *type, void *devdata,
1523                                 const struct thermal_cooling_device_ops *ops)
1524 {
1525         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1526 }
1527 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1528
1529 /**
1530  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1531  * @np:         a pointer to a device tree node.
1532  * @type:       the thermal cooling device type.
1533  * @devdata:    device private data.
1534  * @ops:                standard thermal cooling devices callbacks.
1535  *
1536  * This function will register a cooling device with device tree node reference.
1537  * This interface function adds a new thermal cooling device (fan/processor/...)
1538  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1539  * to all the thermal zone devices registered at the same time.
1540  *
1541  * Return: a pointer to the created struct thermal_cooling_device or an
1542  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1543  */
1544 struct thermal_cooling_device *
1545 thermal_of_cooling_device_register(struct device_node *np,
1546                                    char *type, void *devdata,
1547                                    const struct thermal_cooling_device_ops *ops)
1548 {
1549         return __thermal_cooling_device_register(np, type, devdata, ops);
1550 }
1551 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1552
1553 /**
1554  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1555  * @cdev:       the thermal cooling device to remove.
1556  *
1557  * thermal_cooling_device_unregister() must be called when the device is no
1558  * longer needed.
1559  */
1560 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1561 {
1562         int i;
1563         const struct thermal_zone_params *tzp;
1564         struct thermal_zone_device *tz;
1565         struct thermal_cooling_device *pos = NULL;
1566
1567         if (!cdev)
1568                 return;
1569
1570         mutex_lock(&thermal_list_lock);
1571         list_for_each_entry(pos, &thermal_cdev_list, node)
1572             if (pos == cdev)
1573                 break;
1574         if (pos != cdev) {
1575                 /* thermal cooling device not found */
1576                 mutex_unlock(&thermal_list_lock);
1577                 return;
1578         }
1579         list_del(&cdev->node);
1580
1581         /* Unbind all thermal zones associated with 'this' cdev */
1582         list_for_each_entry(tz, &thermal_tz_list, node) {
1583                 if (tz->ops->unbind) {
1584                         tz->ops->unbind(tz, cdev);
1585                         continue;
1586                 }
1587
1588                 if (!tz->tzp || !tz->tzp->tbp)
1589                         continue;
1590
1591                 tzp = tz->tzp;
1592                 for (i = 0; i < tzp->num_tbps; i++) {
1593                         if (tzp->tbp[i].cdev == cdev) {
1594                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1595                                 tzp->tbp[i].cdev = NULL;
1596                         }
1597                 }
1598         }
1599
1600         mutex_unlock(&thermal_list_lock);
1601
1602         if (cdev->type[0])
1603                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1604         device_remove_file(&cdev->device, &dev_attr_max_state);
1605         device_remove_file(&cdev->device, &dev_attr_cur_state);
1606
1607         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1608         device_unregister(&cdev->device);
1609         return;
1610 }
1611 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1612
1613 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1614 {
1615         struct thermal_instance *instance;
1616         unsigned long target = 0;
1617
1618         /* cooling device is updated*/
1619         if (cdev->updated)
1620                 return;
1621
1622         mutex_lock(&cdev->lock);
1623         /* Make sure cdev enters the deepest cooling state */
1624         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1625                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1626                                 instance->tz->id, instance->target);
1627                 if (instance->target == THERMAL_NO_TARGET)
1628                         continue;
1629                 if (instance->target > target)
1630                         target = instance->target;
1631         }
1632         mutex_unlock(&cdev->lock);
1633         cdev->ops->set_cur_state(cdev, target);
1634         cdev->updated = true;
1635         trace_cdev_update(cdev, target);
1636         dev_dbg(&cdev->device, "set to state %lu\n", target);
1637 }
1638 EXPORT_SYMBOL(thermal_cdev_update);
1639
1640 /**
1641  * thermal_notify_framework - Sensor drivers use this API to notify framework
1642  * @tz:         thermal zone device
1643  * @trip:       indicates which trip point has been crossed
1644  *
1645  * This function handles the trip events from sensor drivers. It starts
1646  * throttling the cooling devices according to the policy configured.
1647  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1648  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1649  * The throttling policy is based on the configured platform data; if no
1650  * platform data is provided, this uses the step_wise throttling policy.
1651  */
1652 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1653 {
1654         handle_thermal_trip(tz, trip);
1655 }
1656 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1657
1658 /**
1659  * create_trip_attrs() - create attributes for trip points
1660  * @tz:         the thermal zone device
1661  * @mask:       Writeable trip point bitmap.
1662  *
1663  * helper function to instantiate sysfs entries for every trip
1664  * point and its properties of a struct thermal_zone_device.
1665  *
1666  * Return: 0 on success, the proper error value otherwise.
1667  */
1668 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1669 {
1670         int indx;
1671         int size = sizeof(struct thermal_attr) * tz->trips;
1672
1673         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1674         if (!tz->trip_type_attrs)
1675                 return -ENOMEM;
1676
1677         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1678         if (!tz->trip_temp_attrs) {
1679                 kfree(tz->trip_type_attrs);
1680                 return -ENOMEM;
1681         }
1682
1683         if (tz->ops->get_trip_hyst) {
1684                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1685                 if (!tz->trip_hyst_attrs) {
1686                         kfree(tz->trip_type_attrs);
1687                         kfree(tz->trip_temp_attrs);
1688                         return -ENOMEM;
1689                 }
1690         }
1691
1692
1693         for (indx = 0; indx < tz->trips; indx++) {
1694                 /* create trip type attribute */
1695                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1696                          "trip_point_%d_type", indx);
1697
1698                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1699                 tz->trip_type_attrs[indx].attr.attr.name =
1700                                                 tz->trip_type_attrs[indx].name;
1701                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1702                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1703
1704                 device_create_file(&tz->device,
1705                                    &tz->trip_type_attrs[indx].attr);
1706
1707                 /* create trip temp attribute */
1708                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1709                          "trip_point_%d_temp", indx);
1710
1711                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1712                 tz->trip_temp_attrs[indx].attr.attr.name =
1713                                                 tz->trip_temp_attrs[indx].name;
1714                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1715                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1716                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1717                     mask & (1 << indx)) {
1718                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1719                         tz->trip_temp_attrs[indx].attr.store =
1720                                                         trip_point_temp_store;
1721                 }
1722
1723                 device_create_file(&tz->device,
1724                                    &tz->trip_temp_attrs[indx].attr);
1725
1726                 /* create Optional trip hyst attribute */
1727                 if (!tz->ops->get_trip_hyst)
1728                         continue;
1729                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1730                          "trip_point_%d_hyst", indx);
1731
1732                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1733                 tz->trip_hyst_attrs[indx].attr.attr.name =
1734                                         tz->trip_hyst_attrs[indx].name;
1735                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1736                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1737                 if (tz->ops->set_trip_hyst) {
1738                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1739                         tz->trip_hyst_attrs[indx].attr.store =
1740                                         trip_point_hyst_store;
1741                 }
1742
1743                 device_create_file(&tz->device,
1744                                    &tz->trip_hyst_attrs[indx].attr);
1745         }
1746         return 0;
1747 }
1748
1749 static void remove_trip_attrs(struct thermal_zone_device *tz)
1750 {
1751         int indx;
1752
1753         for (indx = 0; indx < tz->trips; indx++) {
1754                 device_remove_file(&tz->device,
1755                                    &tz->trip_type_attrs[indx].attr);
1756                 device_remove_file(&tz->device,
1757                                    &tz->trip_temp_attrs[indx].attr);
1758                 if (tz->ops->get_trip_hyst)
1759                         device_remove_file(&tz->device,
1760                                   &tz->trip_hyst_attrs[indx].attr);
1761         }
1762         kfree(tz->trip_type_attrs);
1763         kfree(tz->trip_temp_attrs);
1764         kfree(tz->trip_hyst_attrs);
1765 }
1766
1767 /**
1768  * thermal_zone_device_register() - register a new thermal zone device
1769  * @type:       the thermal zone device type
1770  * @trips:      the number of trip points the thermal zone support
1771  * @mask:       a bit string indicating the writeablility of trip points
1772  * @devdata:    private device data
1773  * @ops:        standard thermal zone device callbacks
1774  * @tzp:        thermal zone platform parameters
1775  * @passive_delay: number of milliseconds to wait between polls when
1776  *                 performing passive cooling
1777  * @polling_delay: number of milliseconds to wait between polls when checking
1778  *                 whether trip points have been crossed (0 for interrupt
1779  *                 driven systems)
1780  *
1781  * This interface function adds a new thermal zone device (sensor) to
1782  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1783  * thermal cooling devices registered at the same time.
1784  * thermal_zone_device_unregister() must be called when the device is no
1785  * longer needed. The passive cooling depends on the .get_trend() return value.
1786  *
1787  * Return: a pointer to the created struct thermal_zone_device or an
1788  * in case of error, an ERR_PTR. Caller must check return value with
1789  * IS_ERR*() helpers.
1790  */
1791 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1792         int trips, int mask, void *devdata,
1793         struct thermal_zone_device_ops *ops,
1794         struct thermal_zone_params *tzp,
1795         int passive_delay, int polling_delay)
1796 {
1797         struct thermal_zone_device *tz;
1798         enum thermal_trip_type trip_type;
1799         int result;
1800         int count;
1801         int passive = 0;
1802         struct thermal_governor *governor;
1803
1804         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1805                 return ERR_PTR(-EINVAL);
1806
1807         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1808                 return ERR_PTR(-EINVAL);
1809
1810         if (!ops)
1811                 return ERR_PTR(-EINVAL);
1812
1813         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1814                 return ERR_PTR(-EINVAL);
1815
1816         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1817         if (!tz)
1818                 return ERR_PTR(-ENOMEM);
1819
1820         INIT_LIST_HEAD(&tz->thermal_instances);
1821         idr_init(&tz->idr);
1822         mutex_init(&tz->lock);
1823         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1824         if (result) {
1825                 kfree(tz);
1826                 return ERR_PTR(result);
1827         }
1828
1829         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1830         tz->ops = ops;
1831         tz->tzp = tzp;
1832         tz->device.class = &thermal_class;
1833         tz->devdata = devdata;
1834         tz->trips = trips;
1835         tz->passive_delay = passive_delay;
1836         tz->polling_delay = polling_delay;
1837         /* A new thermal zone needs to be updated anyway. */
1838         atomic_set(&tz->need_update, 1);
1839
1840         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1841         result = device_register(&tz->device);
1842         if (result) {
1843                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1844                 kfree(tz);
1845                 return ERR_PTR(result);
1846         }
1847
1848         /* sys I/F */
1849         if (type) {
1850                 result = device_create_file(&tz->device, &dev_attr_type);
1851                 if (result)
1852                         goto unregister;
1853         }
1854
1855         result = device_create_file(&tz->device, &dev_attr_temp);
1856         if (result)
1857                 goto unregister;
1858
1859         if (ops->get_mode) {
1860                 result = device_create_file(&tz->device, &dev_attr_mode);
1861                 if (result)
1862                         goto unregister;
1863         }
1864
1865         result = create_trip_attrs(tz, mask);
1866         if (result)
1867                 goto unregister;
1868
1869         for (count = 0; count < trips; count++) {
1870                 tz->ops->get_trip_type(tz, count, &trip_type);
1871                 if (trip_type == THERMAL_TRIP_PASSIVE)
1872                         passive = 1;
1873         }
1874
1875         if (!passive) {
1876                 result = device_create_file(&tz->device, &dev_attr_passive);
1877                 if (result)
1878                         goto unregister;
1879         }
1880
1881         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1882                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1883                 if (result)
1884                         goto unregister;
1885         }
1886
1887         /* Create policy attribute */
1888         result = device_create_file(&tz->device, &dev_attr_policy);
1889         if (result)
1890                 goto unregister;
1891
1892         /* Add thermal zone params */
1893         result = create_tzp_attrs(&tz->device);
1894         if (result)
1895                 goto unregister;
1896
1897         /* Create available_policies attribute */
1898         result = device_create_file(&tz->device, &dev_attr_available_policies);
1899         if (result)
1900                 goto unregister;
1901
1902         /* Update 'this' zone's governor information */
1903         mutex_lock(&thermal_governor_lock);
1904
1905         if (tz->tzp)
1906                 governor = __find_governor(tz->tzp->governor_name);
1907         else
1908                 governor = def_governor;
1909
1910         result = thermal_set_governor(tz, governor);
1911         if (result) {
1912                 mutex_unlock(&thermal_governor_lock);
1913                 goto unregister;
1914         }
1915
1916         mutex_unlock(&thermal_governor_lock);
1917
1918         if (!tz->tzp || !tz->tzp->no_hwmon) {
1919                 result = thermal_add_hwmon_sysfs(tz);
1920                 if (result)
1921                         goto unregister;
1922         }
1923
1924         mutex_lock(&thermal_list_lock);
1925         list_add_tail(&tz->node, &thermal_tz_list);
1926         mutex_unlock(&thermal_list_lock);
1927
1928         /* Bind cooling devices for this zone */
1929         bind_tz(tz);
1930
1931         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1932
1933         thermal_zone_device_reset(tz);
1934         /* Update the new thermal zone and mark it as already updated. */
1935         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1936                 thermal_zone_device_update(tz);
1937
1938         return tz;
1939
1940 unregister:
1941         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1942         device_unregister(&tz->device);
1943         return ERR_PTR(result);
1944 }
1945 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1946
1947 /**
1948  * thermal_device_unregister - removes the registered thermal zone device
1949  * @tz: the thermal zone device to remove
1950  */
1951 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1952 {
1953         int i;
1954         const struct thermal_zone_params *tzp;
1955         struct thermal_cooling_device *cdev;
1956         struct thermal_zone_device *pos = NULL;
1957
1958         if (!tz)
1959                 return;
1960
1961         tzp = tz->tzp;
1962
1963         mutex_lock(&thermal_list_lock);
1964         list_for_each_entry(pos, &thermal_tz_list, node)
1965             if (pos == tz)
1966                 break;
1967         if (pos != tz) {
1968                 /* thermal zone device not found */
1969                 mutex_unlock(&thermal_list_lock);
1970                 return;
1971         }
1972         list_del(&tz->node);
1973
1974         /* Unbind all cdevs associated with 'this' thermal zone */
1975         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1976                 if (tz->ops->unbind) {
1977                         tz->ops->unbind(tz, cdev);
1978                         continue;
1979                 }
1980
1981                 if (!tzp || !tzp->tbp)
1982                         break;
1983
1984                 for (i = 0; i < tzp->num_tbps; i++) {
1985                         if (tzp->tbp[i].cdev == cdev) {
1986                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1987                                 tzp->tbp[i].cdev = NULL;
1988                         }
1989                 }
1990         }
1991
1992         mutex_unlock(&thermal_list_lock);
1993
1994         thermal_zone_device_set_polling(tz, 0);
1995
1996         if (tz->type[0])
1997                 device_remove_file(&tz->device, &dev_attr_type);
1998         device_remove_file(&tz->device, &dev_attr_temp);
1999         if (tz->ops->get_mode)
2000                 device_remove_file(&tz->device, &dev_attr_mode);
2001         device_remove_file(&tz->device, &dev_attr_policy);
2002         device_remove_file(&tz->device, &dev_attr_available_policies);
2003         remove_trip_attrs(tz);
2004         thermal_set_governor(tz, NULL);
2005
2006         thermal_remove_hwmon_sysfs(tz);
2007         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2008         idr_destroy(&tz->idr);
2009         mutex_destroy(&tz->lock);
2010         device_unregister(&tz->device);
2011         return;
2012 }
2013 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2014
2015 /**
2016  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2017  * @name: thermal zone name to fetch the temperature
2018  *
2019  * When only one zone is found with the passed name, returns a reference to it.
2020  *
2021  * Return: On success returns a reference to an unique thermal zone with
2022  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2023  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2024  */
2025 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2026 {
2027         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2028         unsigned int found = 0;
2029
2030         if (!name)
2031                 goto exit;
2032
2033         mutex_lock(&thermal_list_lock);
2034         list_for_each_entry(pos, &thermal_tz_list, node)
2035                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2036                         found++;
2037                         ref = pos;
2038                 }
2039         mutex_unlock(&thermal_list_lock);
2040
2041         /* nothing has been found, thus an error code for it */
2042         if (found == 0)
2043                 ref = ERR_PTR(-ENODEV);
2044         else if (found > 1)
2045         /* Success only when an unique zone is found */
2046                 ref = ERR_PTR(-EEXIST);
2047
2048 exit:
2049         return ref;
2050 }
2051 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2052
2053 #ifdef CONFIG_NET
2054 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2055         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2056 };
2057
2058 static struct genl_family thermal_event_genl_family = {
2059         .id = GENL_ID_GENERATE,
2060         .name = THERMAL_GENL_FAMILY_NAME,
2061         .version = THERMAL_GENL_VERSION,
2062         .maxattr = THERMAL_GENL_ATTR_MAX,
2063         .mcgrps = thermal_event_mcgrps,
2064         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2065 };
2066
2067 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2068                                         enum events event)
2069 {
2070         struct sk_buff *skb;
2071         struct nlattr *attr;
2072         struct thermal_genl_event *thermal_event;
2073         void *msg_header;
2074         int size;
2075         int result;
2076         static unsigned int thermal_event_seqnum;
2077
2078         if (!tz)
2079                 return -EINVAL;
2080
2081         /* allocate memory */
2082         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2083                nla_total_size(0);
2084
2085         skb = genlmsg_new(size, GFP_ATOMIC);
2086         if (!skb)
2087                 return -ENOMEM;
2088
2089         /* add the genetlink message header */
2090         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2091                                  &thermal_event_genl_family, 0,
2092                                  THERMAL_GENL_CMD_EVENT);
2093         if (!msg_header) {
2094                 nlmsg_free(skb);
2095                 return -ENOMEM;
2096         }
2097
2098         /* fill the data */
2099         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2100                            sizeof(struct thermal_genl_event));
2101
2102         if (!attr) {
2103                 nlmsg_free(skb);
2104                 return -EINVAL;
2105         }
2106
2107         thermal_event = nla_data(attr);
2108         if (!thermal_event) {
2109                 nlmsg_free(skb);
2110                 return -EINVAL;
2111         }
2112
2113         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2114
2115         thermal_event->orig = tz->id;
2116         thermal_event->event = event;
2117
2118         /* send multicast genetlink message */
2119         genlmsg_end(skb, msg_header);
2120
2121         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2122                                    0, GFP_ATOMIC);
2123         if (result)
2124                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2125
2126         return result;
2127 }
2128 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2129
2130 static int genetlink_init(void)
2131 {
2132         return genl_register_family(&thermal_event_genl_family);
2133 }
2134
2135 static void genetlink_exit(void)
2136 {
2137         genl_unregister_family(&thermal_event_genl_family);
2138 }
2139 #else /* !CONFIG_NET */
2140 static inline int genetlink_init(void) { return 0; }
2141 static inline void genetlink_exit(void) {}
2142 #endif /* !CONFIG_NET */
2143
2144 static int __init thermal_register_governors(void)
2145 {
2146         int result;
2147
2148         result = thermal_gov_step_wise_register();
2149         if (result)
2150                 return result;
2151
2152         result = thermal_gov_fair_share_register();
2153         if (result)
2154                 return result;
2155
2156         result = thermal_gov_bang_bang_register();
2157         if (result)
2158                 return result;
2159
2160         result = thermal_gov_user_space_register();
2161         if (result)
2162                 return result;
2163
2164         return thermal_gov_power_allocator_register();
2165 }
2166
2167 static void thermal_unregister_governors(void)
2168 {
2169         thermal_gov_step_wise_unregister();
2170         thermal_gov_fair_share_unregister();
2171         thermal_gov_bang_bang_unregister();
2172         thermal_gov_user_space_unregister();
2173         thermal_gov_power_allocator_unregister();
2174 }
2175
2176 static int thermal_pm_notify(struct notifier_block *nb,
2177                                 unsigned long mode, void *_unused)
2178 {
2179         struct thermal_zone_device *tz;
2180
2181         switch (mode) {
2182         case PM_HIBERNATION_PREPARE:
2183         case PM_RESTORE_PREPARE:
2184         case PM_SUSPEND_PREPARE:
2185                 atomic_set(&in_suspend, 1);
2186                 break;
2187         case PM_POST_HIBERNATION:
2188         case PM_POST_RESTORE:
2189         case PM_POST_SUSPEND:
2190                 atomic_set(&in_suspend, 0);
2191                 list_for_each_entry(tz, &thermal_tz_list, node) {
2192                         thermal_zone_device_reset(tz);
2193                         thermal_zone_device_update(tz);
2194                 }
2195                 break;
2196         default:
2197                 break;
2198         }
2199         return 0;
2200 }
2201
2202 static struct notifier_block thermal_pm_nb = {
2203         .notifier_call = thermal_pm_notify,
2204 };
2205
2206 static int __init thermal_init(void)
2207 {
2208         int result;
2209
2210         result = thermal_register_governors();
2211         if (result)
2212                 goto error;
2213
2214         result = class_register(&thermal_class);
2215         if (result)
2216                 goto unregister_governors;
2217
2218         result = genetlink_init();
2219         if (result)
2220                 goto unregister_class;
2221
2222         result = of_parse_thermal_zones();
2223         if (result)
2224                 goto exit_netlink;
2225
2226         result = register_pm_notifier(&thermal_pm_nb);
2227         if (result)
2228                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2229                         result);
2230
2231         return 0;
2232
2233 exit_netlink:
2234         genetlink_exit();
2235 unregister_class:
2236         class_unregister(&thermal_class);
2237 unregister_governors:
2238         thermal_unregister_governors();
2239 error:
2240         idr_destroy(&thermal_tz_idr);
2241         idr_destroy(&thermal_cdev_idr);
2242         mutex_destroy(&thermal_idr_lock);
2243         mutex_destroy(&thermal_list_lock);
2244         mutex_destroy(&thermal_governor_lock);
2245         return result;
2246 }
2247
2248 static void __exit thermal_exit(void)
2249 {
2250         unregister_pm_notifier(&thermal_pm_nb);
2251         of_thermal_destroy_zones();
2252         genetlink_exit();
2253         class_unregister(&thermal_class);
2254         thermal_unregister_governors();
2255         idr_destroy(&thermal_tz_idr);
2256         idr_destroy(&thermal_cdev_idr);
2257         mutex_destroy(&thermal_idr_lock);
2258         mutex_destroy(&thermal_list_lock);
2259         mutex_destroy(&thermal_governor_lock);
2260 }
2261
2262 fs_initcall(thermal_init);
2263 module_exit(thermal_exit);