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         if (ret)
 700                 return ret;
 701
 702         thermal_zone_device_update(tz);
 703
 704         return count;
 705 }
 706
 707 static ssize_t
 708 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 709                      char *buf)
 710 {
 711         struct thermal_zone_device *tz = to_thermal_zone(dev);
 712         int trip, ret;
 713         int temperature;
 714
 715         if (!tz->ops->get_trip_temp)
 716                 return -EPERM;
 717
 718         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 719                 return -EINVAL;
 720
 721         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 722
 723         if (ret)
 724                 return ret;
 725
 726         return sprintf(buf, "%d\n", temperature);
 727 }
 728
 729 static ssize_t
 730 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 731                         const char *buf, size_t count)
 732 {
 733         struct thermal_zone_device *tz = to_thermal_zone(dev);
 734         int trip, ret;
 735         int temperature;
 736
 737         if (!tz->ops->set_trip_hyst)
 738                 return -EPERM;
 739
 740         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 741                 return -EINVAL;
 742
 743         if (kstrtoint(buf, 10, &temperature))
 744                 return -EINVAL;
 745
 746         /*
 747          * We are not doing any check on the 'temperature' value
 748          * here. The driver implementing 'set_trip_hyst' has to
 749          * take care of this.
 750          */
 751         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 752
 753         return ret ? ret : count;
 754 }
 755
 756 static ssize_t
 757 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 758                         char *buf)
 759 {
 760         struct thermal_zone_device *tz = to_thermal_zone(dev);
 761         int trip, ret;
 762         int temperature;
 763
 764         if (!tz->ops->get_trip_hyst)
 765                 return -EPERM;
 766
 767         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 768                 return -EINVAL;
 769
 770         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 771
 772         return ret ? ret : sprintf(buf, "%d\n", temperature);
 773 }
 774
 775 static ssize_t
 776 passive_store(struct device *dev, struct device_attribute *attr,
 777                     const char *buf, size_t count)
 778 {
 779         struct thermal_zone_device *tz = to_thermal_zone(dev);
 780         struct thermal_cooling_device *cdev = NULL;
 781         int state;
 782
 783         if (!sscanf(buf, "%d\n", &state))
 784                 return -EINVAL;
 785
 786         /* sanity check: values below 1000 millicelcius don't make sense
 787          * and can cause the system to go into a thermal heart attack
 788          */
 789         if (state && state < 1000)
 790                 return -EINVAL;
 791
 792         if (state && !tz->forced_passive) {
 793                 mutex_lock(&thermal_list_lock);
 794                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 795                         if (!strncmp("Processor", cdev->type,
 796                                      sizeof("Processor")))
 797                                 thermal_zone_bind_cooling_device(tz,
 798                                                 THERMAL_TRIPS_NONE, cdev,
 799                                                 THERMAL_NO_LIMIT,
 800                                                 THERMAL_NO_LIMIT,
 801                                                 THERMAL_WEIGHT_DEFAULT);
 802                 }
 803                 mutex_unlock(&thermal_list_lock);
 804                 if (!tz->passive_delay)
 805                         tz->passive_delay = 1000;
 806         } else if (!state && tz->forced_passive) {
 807                 mutex_lock(&thermal_list_lock);
 808                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 809                         if (!strncmp("Processor", cdev->type,
 810                                      sizeof("Processor")))
 811                                 thermal_zone_unbind_cooling_device(tz,
 812                                                                    THERMAL_TRIPS_NONE,
 813                                                                    cdev);
 814                 }
 815                 mutex_unlock(&thermal_list_lock);
 816                 tz->passive_delay = 0;
 817         }
 818
 819         tz->forced_passive = state;
 820
 821         thermal_zone_device_update(tz);
 822
 823         return count;
 824 }
 825
 826 static ssize_t
 827 passive_show(struct device *dev, struct device_attribute *attr,
 828                    char *buf)
 829 {
 830         struct thermal_zone_device *tz = to_thermal_zone(dev);
 831
 832         return sprintf(buf, "%d\n", tz->forced_passive);
 833 }
 834
 835 static ssize_t
 836 policy_store(struct device *dev, struct device_attribute *attr,
 837                     const char *buf, size_t count)
 838 {
 839         int ret = -EINVAL;
 840         struct thermal_zone_device *tz = to_thermal_zone(dev);
 841         struct thermal_governor *gov;
 842         char name[THERMAL_NAME_LENGTH];
 843
 844         snprintf(name, sizeof(name), "%s", buf);
 845
 846         mutex_lock(&thermal_governor_lock);
 847         mutex_lock(&tz->lock);
 848
 849         gov = __find_governor(strim(name));
 850         if (!gov)
 851                 goto exit;
 852
 853         ret = thermal_set_governor(tz, gov);
 854         if (!ret)
 855                 ret = count;
 856
 857 exit:
 858         mutex_unlock(&tz->lock);
 859         mutex_unlock(&thermal_governor_lock);
 860         return ret;
 861 }
 862
 863 static ssize_t
 864 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 865 {
 866         struct thermal_zone_device *tz = to_thermal_zone(dev);
 867
 868         return sprintf(buf, "%s\n", tz->governor->name);
 869 }
 870
 871 static ssize_t
 872 available_policies_show(struct device *dev, struct device_attribute *devattr,
 873                         char *buf)
 874 {
 875         struct thermal_governor *pos;
 876         ssize_t count = 0;
 877         ssize_t size = PAGE_SIZE;
 878
 879         mutex_lock(&thermal_governor_lock);
 880
 881         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 882                 size = PAGE_SIZE - count;
 883                 count += scnprintf(buf + count, size, "%s ", pos->name);
 884         }
 885         count += scnprintf(buf + count, size, "\n");
 886
 887         mutex_unlock(&thermal_governor_lock);
 888
 889         return count;
 890 }
 891
 892 static ssize_t
 893 emul_temp_store(struct device *dev, struct device_attribute *attr,
 894                      const char *buf, size_t count)
 895 {
 896         struct thermal_zone_device *tz = to_thermal_zone(dev);
 897         int ret = 0;
 898         unsigned long temperature;
 899
 900         if (kstrtoul(buf, 10, &temperature))
 901                 return -EINVAL;
 902
 903         if (!tz->ops->set_emul_temp) {
 904                 mutex_lock(&tz->lock);
 905                 tz->emul_temperature = temperature;
 906                 mutex_unlock(&tz->lock);
 907         } else {
 908                 ret = tz->ops->set_emul_temp(tz, temperature);
 909         }
 910
 911         if (!ret)
 912                 thermal_zone_device_update(tz);
 913
 914         return ret ? ret : count;
 915 }
 916 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 917
 918 static ssize_t
 919 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 920                        char *buf)
 921 {
 922         struct thermal_zone_device *tz = to_thermal_zone(dev);
 923
 924         if (tz->tzp)
 925                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 926         else
 927                 return -EIO;
 928 }
 929
 930 static ssize_t
 931 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 932                         const char *buf, size_t count)
 933 {
 934         struct thermal_zone_device *tz = to_thermal_zone(dev);
 935         u32 sustainable_power;
 936
 937         if (!tz->tzp)
 938                 return -EIO;
 939
 940         if (kstrtou32(buf, 10, &sustainable_power))
 941                 return -EINVAL;
 942
 943         tz->tzp->sustainable_power = sustainable_power;
 944
 945         return count;
 946 }
 947 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 948                 sustainable_power_store);
 949
 950 #define create_s32_tzp_attr(name)                                       \
 951         static ssize_t                                                  \
 952         name##_show(struct device *dev, struct device_attribute *devattr, \
 953                 char *buf)                                              \
 954         {                                                               \
 955         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
 956                                                                         \
 957         if (tz->tzp)                                                    \
 958                 return sprintf(buf, "%u\n", tz->tzp->name);             \
 959         else                                                            \
 960                 return -EIO;                                            \
 961         }                                                               \
 962                                                                         \
 963         static ssize_t                                                  \
 964         name##_store(struct device *dev, struct device_attribute *devattr, \
 965                 const char *buf, size_t count)                          \
 966         {                                                               \
 967                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
 968                 s32 value;                                              \
 969                                                                         \
 970                 if (!tz->tzp)                                           \
 971                         return -EIO;                                    \
 972                                                                         \
 973                 if (kstrtos32(buf, 10, &value))                         \
 974                         return -EINVAL;                                 \
 975                                                                         \
 976                 tz->tzp->name = value;                                  \
 977                                                                         \
 978                 return count;                                           \
 979         }                                                               \
 980         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
 981
 982 create_s32_tzp_attr(k_po);
 983 create_s32_tzp_attr(k_pu);
 984 create_s32_tzp_attr(k_i);
 985 create_s32_tzp_attr(k_d);
 986 create_s32_tzp_attr(integral_cutoff);
 987 create_s32_tzp_attr(slope);
 988 create_s32_tzp_attr(offset);
 989 #undef create_s32_tzp_attr
 990
 991 static struct device_attribute *dev_tzp_attrs[] = {
 992         &dev_attr_sustainable_power,
 993         &dev_attr_k_po,
 994         &dev_attr_k_pu,
 995         &dev_attr_k_i,
 996         &dev_attr_k_d,
 997         &dev_attr_integral_cutoff,
 998         &dev_attr_slope,
 999         &dev_attr_offset,
1000 };
1001
1002 static int create_tzp_attrs(struct device *dev)
1003 {
1004         int i;
1005
1006         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1007                 int ret;
1008                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1009
1010                 ret = device_create_file(dev, dev_attr);
1011                 if (ret)
1012                         return ret;
1013         }
1014
1015         return 0;
1016 }
1017
1018 /**
1019  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1020  * @cdev:       pointer to &thermal_cooling_device
1021  * @tz:         a valid thermal zone device pointer
1022  * @max_power:  pointer in which to store the maximum power
1023  *
1024  * Calculate the maximum power consumption in milliwats that the
1025  * cooling device can currently consume and store it in @max_power.
1026  *
1027  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1028  * power_actor API or -E* on other error.
1029  */
1030 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1031                               struct thermal_zone_device *tz, u32 *max_power)
1032 {
1033         if (!cdev_is_power_actor(cdev))
1034                 return -EINVAL;
1035
1036         return cdev->ops->state2power(cdev, tz, 0, max_power);
1037 }
1038
1039 /**
1040  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1041  * @cdev:       pointer to &thermal_cooling_device
1042  * @tz:         a valid thermal zone device pointer
1043  * @min_power:  pointer in which to store the minimum power
1044  *
1045  * Calculate the minimum power consumption in milliwatts that the
1046  * cooling device can currently consume and store it in @min_power.
1047  *
1048  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1049  * power_actor API or -E* on other error.
1050  */
1051 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1052                               struct thermal_zone_device *tz, u32 *min_power)
1053 {
1054         unsigned long max_state;
1055         int ret;
1056
1057         if (!cdev_is_power_actor(cdev))
1058                 return -EINVAL;
1059
1060         ret = cdev->ops->get_max_state(cdev, &max_state);
1061         if (ret)
1062                 return ret;
1063
1064         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1065 }
1066
1067 /**
1068  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1069  * @cdev:       pointer to &thermal_cooling_device
1070  * @instance:   thermal instance to update
1071  * @power:      the power in milliwatts
1072  *
1073  * Set the cooling device to consume at most @power milliwatts.
1074  *
1075  * Return: 0 on success, -EINVAL if the cooling device does not
1076  * implement the power actor API or -E* for other failures.
1077  */
1078 int power_actor_set_power(struct thermal_cooling_device *cdev,
1079                           struct thermal_instance *instance, u32 power)
1080 {
1081         unsigned long state;
1082         int ret;
1083
1084         if (!cdev_is_power_actor(cdev))
1085                 return -EINVAL;
1086
1087         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1088         if (ret)
1089                 return ret;
1090
1091         instance->target = state;
1092         cdev->updated = false;
1093         thermal_cdev_update(cdev);
1094
1095         return 0;
1096 }
1097
1098 static DEVICE_ATTR(type, 0444, type_show, NULL);
1099 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1100 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1101 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1102 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1103 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1104
1105 /* sys I/F for cooling device */
1106 #define to_cooling_device(_dev) \
1107         container_of(_dev, struct thermal_cooling_device, device)
1108
1109 static ssize_t
1110 thermal_cooling_device_type_show(struct device *dev,
1111                                  struct device_attribute *attr, char *buf)
1112 {
1113         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1114
1115         return sprintf(buf, "%s\n", cdev->type);
1116 }
1117
1118 static ssize_t
1119 thermal_cooling_device_max_state_show(struct device *dev,
1120                                       struct device_attribute *attr, char *buf)
1121 {
1122         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1123         unsigned long state;
1124         int ret;
1125
1126         ret = cdev->ops->get_max_state(cdev, &state);
1127         if (ret)
1128                 return ret;
1129         return sprintf(buf, "%ld\n", state);
1130 }
1131
1132 static ssize_t
1133 thermal_cooling_device_cur_state_show(struct device *dev,
1134                                       struct device_attribute *attr, char *buf)
1135 {
1136         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1137         unsigned long state;
1138         int ret;
1139
1140         ret = cdev->ops->get_cur_state(cdev, &state);
1141         if (ret)
1142                 return ret;
1143         return sprintf(buf, "%ld\n", state);
1144 }
1145
1146 static ssize_t
1147 thermal_cooling_device_cur_state_store(struct device *dev,
1148                                        struct device_attribute *attr,
1149                                        const char *buf, size_t count)
1150 {
1151         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1152         unsigned long state;
1153         int result;
1154
1155         if (!sscanf(buf, "%ld\n", &state))
1156                 return -EINVAL;
1157
1158         if ((long)state < 0)
1159                 return -EINVAL;
1160
1161         result = cdev->ops->set_cur_state(cdev, state);
1162         if (result)
1163                 return result;
1164         return count;
1165 }
1166
1167 static struct device_attribute dev_attr_cdev_type =
1168 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1169 static DEVICE_ATTR(max_state, 0444,
1170                    thermal_cooling_device_max_state_show, NULL);
1171 static DEVICE_ATTR(cur_state, 0644,
1172                    thermal_cooling_device_cur_state_show,
1173                    thermal_cooling_device_cur_state_store);
1174
1175 static ssize_t
1176 thermal_cooling_device_trip_point_show(struct device *dev,
1177                                        struct device_attribute *attr, char *buf)
1178 {
1179         struct thermal_instance *instance;
1180
1181         instance =
1182             container_of(attr, struct thermal_instance, attr);
1183
1184         if (instance->trip == THERMAL_TRIPS_NONE)
1185                 return sprintf(buf, "-1\n");
1186         else
1187                 return sprintf(buf, "%d\n", instance->trip);
1188 }
1189
1190 static struct attribute *cooling_device_attrs[] = {
1191         &dev_attr_cdev_type.attr,
1192         &dev_attr_max_state.attr,
1193         &dev_attr_cur_state.attr,
1194         NULL,
1195 };
1196
1197 static const struct attribute_group cooling_device_attr_group = {
1198         .attrs = cooling_device_attrs,
1199 };
1200
1201 static const struct attribute_group *cooling_device_attr_groups[] = {
1202         &cooling_device_attr_group,
1203         NULL,
1204 };
1205
1206 static ssize_t
1207 thermal_cooling_device_weight_show(struct device *dev,
1208                                    struct device_attribute *attr, char *buf)
1209 {
1210         struct thermal_instance *instance;
1211
1212         instance = container_of(attr, struct thermal_instance, weight_attr);
1213
1214         return sprintf(buf, "%d\n", instance->weight);
1215 }
1216
1217 static ssize_t
1218 thermal_cooling_device_weight_store(struct device *dev,
1219                                     struct device_attribute *attr,
1220                                     const char *buf, size_t count)
1221 {
1222         struct thermal_instance *instance;
1223         int ret, weight;
1224
1225         ret = kstrtoint(buf, 0, &weight);
1226         if (ret)
1227                 return ret;
1228
1229         instance = container_of(attr, struct thermal_instance, weight_attr);
1230         instance->weight = weight;
1231
1232         return count;
1233 }
1234 /* Device management */
1235
1236 /**
1237  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1238  * @tz:         pointer to struct thermal_zone_device
1239  * @trip:       indicates which trip point the cooling devices is
1240  *              associated with in this thermal zone.
1241  * @cdev:       pointer to struct thermal_cooling_device
1242  * @upper:      the Maximum cooling state for this trip point.
1243  *              THERMAL_NO_LIMIT means no upper limit,
1244  *              and the cooling device can be in max_state.
1245  * @lower:      the Minimum cooling state can be used for this trip point.
1246  *              THERMAL_NO_LIMIT means no lower limit,
1247  *              and the cooling device can be in cooling state 0.
1248  * @weight:     The weight of the cooling device to be bound to the
1249  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1250  *              default value
1251  *
1252  * This interface function bind a thermal cooling device to the certain trip
1253  * point of a thermal zone device.
1254  * This function is usually called in the thermal zone device .bind callback.
1255  *
1256  * Return: 0 on success, the proper error value otherwise.
1257  */
1258 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1259                                      int trip,
1260                                      struct thermal_cooling_device *cdev,
1261                                      unsigned long upper, unsigned long lower,
1262                                      unsigned int weight)
1263 {
1264         struct thermal_instance *dev;
1265         struct thermal_instance *pos;
1266         struct thermal_zone_device *pos1;
1267         struct thermal_cooling_device *pos2;
1268         unsigned long max_state;
1269         int result, ret;
1270
1271         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1272                 return -EINVAL;
1273
1274         list_for_each_entry(pos1, &thermal_tz_list, node) {
1275                 if (pos1 == tz)
1276                         break;
1277         }
1278         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1279                 if (pos2 == cdev)
1280                         break;
1281         }
1282
1283         if (tz != pos1 || cdev != pos2)
1284                 return -EINVAL;
1285
1286         ret = cdev->ops->get_max_state(cdev, &max_state);
1287         if (ret)
1288                 return ret;
1289
1290         /* lower default 0, upper default max_state */
1291         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1292         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1293
1294         if (lower > upper || upper > max_state)
1295                 return -EINVAL;
1296
1297         dev =
1298             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1299         if (!dev)
1300                 return -ENOMEM;
1301         dev->tz = tz;
1302         dev->cdev = cdev;
1303         dev->trip = trip;
1304         dev->upper = upper;
1305         dev->lower = lower;
1306         dev->target = THERMAL_NO_TARGET;
1307         dev->weight = weight;
1308
1309         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1310         if (result)
1311                 goto free_mem;
1312
1313         sprintf(dev->name, "cdev%d", dev->id);
1314         result =
1315             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1316         if (result)
1317                 goto release_idr;
1318
1319         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1320         sysfs_attr_init(&dev->attr.attr);
1321         dev->attr.attr.name = dev->attr_name;
1322         dev->attr.attr.mode = 0444;
1323         dev->attr.show = thermal_cooling_device_trip_point_show;
1324         result = device_create_file(&tz->device, &dev->attr);
1325         if (result)
1326                 goto remove_symbol_link;
1327
1328         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1329         sysfs_attr_init(&dev->weight_attr.attr);
1330         dev->weight_attr.attr.name = dev->weight_attr_name;
1331         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1332         dev->weight_attr.show = thermal_cooling_device_weight_show;
1333         dev->weight_attr.store = thermal_cooling_device_weight_store;
1334         result = device_create_file(&tz->device, &dev->weight_attr);
1335         if (result)
1336                 goto remove_trip_file;
1337
1338         mutex_lock(&tz->lock);
1339         mutex_lock(&cdev->lock);
1340         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1341             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1342                 result = -EEXIST;
1343                 break;
1344         }
1345         if (!result) {
1346                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1347                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1348                 atomic_set(&tz->need_update, 1);
1349         }
1350         mutex_unlock(&cdev->lock);
1351         mutex_unlock(&tz->lock);
1352
1353         if (!result)
1354                 return 0;
1355
1356         device_remove_file(&tz->device, &dev->weight_attr);
1357 remove_trip_file:
1358         device_remove_file(&tz->device, &dev->attr);
1359 remove_symbol_link:
1360         sysfs_remove_link(&tz->device.kobj, dev->name);
1361 release_idr:
1362         release_idr(&tz->idr, &tz->lock, dev->id);
1363 free_mem:
1364         kfree(dev);
1365         return result;
1366 }
1367 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1368
1369 /**
1370  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1371  *                                        thermal zone.
1372  * @tz:         pointer to a struct thermal_zone_device.
1373  * @trip:       indicates which trip point the cooling devices is
1374  *              associated with in this thermal zone.
1375  * @cdev:       pointer to a struct thermal_cooling_device.
1376  *
1377  * This interface function unbind a thermal cooling device from the certain
1378  * trip point of a thermal zone device.
1379  * This function is usually called in the thermal zone device .unbind callback.
1380  *
1381  * Return: 0 on success, the proper error value otherwise.
1382  */
1383 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1384                                        int trip,
1385                                        struct thermal_cooling_device *cdev)
1386 {
1387         struct thermal_instance *pos, *next;
1388
1389         mutex_lock(&tz->lock);
1390         mutex_lock(&cdev->lock);
1391         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1392                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1393                         list_del(&pos->tz_node);
1394                         list_del(&pos->cdev_node);
1395                         mutex_unlock(&cdev->lock);
1396                         mutex_unlock(&tz->lock);
1397                         goto unbind;
1398                 }
1399         }
1400         mutex_unlock(&cdev->lock);
1401         mutex_unlock(&tz->lock);
1402
1403         return -ENODEV;
1404
1405 unbind:
1406         device_remove_file(&tz->device, &pos->weight_attr);
1407         device_remove_file(&tz->device, &pos->attr);
1408         sysfs_remove_link(&tz->device.kobj, pos->name);
1409         release_idr(&tz->idr, &tz->lock, pos->id);
1410         kfree(pos);
1411         return 0;
1412 }
1413 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1414
1415 static void thermal_release(struct device *dev)
1416 {
1417         struct thermal_zone_device *tz;
1418         struct thermal_cooling_device *cdev;
1419
1420         if (!strncmp(dev_name(dev), "thermal_zone",
1421                      sizeof("thermal_zone") - 1)) {
1422                 tz = to_thermal_zone(dev);
1423                 kfree(tz);
1424         } else if(!strncmp(dev_name(dev), "cooling_device",
1425                         sizeof("cooling_device") - 1)){
1426                 cdev = to_cooling_device(dev);
1427                 kfree(cdev);
1428         }
1429 }
1430
1431 static struct class thermal_class = {
1432         .name = "thermal",
1433         .dev_release = thermal_release,
1434 };
1435
1436 /**
1437  * __thermal_cooling_device_register() - register a new thermal cooling device
1438  * @np:         a pointer to a device tree node.
1439  * @type:       the thermal cooling device type.
1440  * @devdata:    device private data.
1441  * @ops:                standard thermal cooling devices callbacks.
1442  *
1443  * This interface function adds a new thermal cooling device (fan/processor/...)
1444  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1445  * to all the thermal zone devices registered at the same time.
1446  * It also gives the opportunity to link the cooling device to a device tree
1447  * node, so that it can be bound to a thermal zone created out of device tree.
1448  *
1449  * Return: a pointer to the created struct thermal_cooling_device or an
1450  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1451  */
1452 static struct thermal_cooling_device *
1453 __thermal_cooling_device_register(struct device_node *np,
1454                                   char *type, void *devdata,
1455                                   const struct thermal_cooling_device_ops *ops)
1456 {
1457         struct thermal_cooling_device *cdev;
1458         struct thermal_zone_device *pos = NULL;
1459         int result;
1460
1461         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1462                 return ERR_PTR(-EINVAL);
1463
1464         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1465             !ops->set_cur_state)
1466                 return ERR_PTR(-EINVAL);
1467
1468         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1469         if (!cdev)
1470                 return ERR_PTR(-ENOMEM);
1471
1472         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1473         if (result) {
1474                 kfree(cdev);
1475                 return ERR_PTR(result);
1476         }
1477
1478         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1479         mutex_init(&cdev->lock);
1480         INIT_LIST_HEAD(&cdev->thermal_instances);
1481         cdev->np = np;
1482         cdev->ops = ops;
1483         cdev->updated = false;
1484         cdev->device.class = &thermal_class;
1485         cdev->device.groups = cooling_device_attr_groups;
1486         cdev->devdata = devdata;
1487         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1488         result = device_register(&cdev->device);
1489         if (result) {
1490                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1491                 kfree(cdev);
1492                 return ERR_PTR(result);
1493         }
1494
1495         /* Add 'this' new cdev to the global cdev list */
1496         mutex_lock(&thermal_list_lock);
1497         list_add(&cdev->node, &thermal_cdev_list);
1498         mutex_unlock(&thermal_list_lock);
1499
1500         /* Update binding information for 'this' new cdev */
1501         bind_cdev(cdev);
1502
1503         mutex_lock(&thermal_list_lock);
1504         list_for_each_entry(pos, &thermal_tz_list, node)
1505                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1506                         thermal_zone_device_update(pos);
1507         mutex_unlock(&thermal_list_lock);
1508
1509         return cdev;
1510 }
1511
1512 /**
1513  * thermal_cooling_device_register() - register a new thermal cooling device
1514  * @type:       the thermal cooling device type.
1515  * @devdata:    device private data.
1516  * @ops:                standard thermal cooling devices callbacks.
1517  *
1518  * This interface function adds a new thermal cooling device (fan/processor/...)
1519  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1520  * to all the thermal zone devices registered at the same time.
1521  *
1522  * Return: a pointer to the created struct thermal_cooling_device or an
1523  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1524  */
1525 struct thermal_cooling_device *
1526 thermal_cooling_device_register(char *type, void *devdata,
1527                                 const struct thermal_cooling_device_ops *ops)
1528 {
1529         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1530 }
1531 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1532
1533 /**
1534  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1535  * @np:         a pointer to a device tree node.
1536  * @type:       the thermal cooling device type.
1537  * @devdata:    device private data.
1538  * @ops:                standard thermal cooling devices callbacks.
1539  *
1540  * This function will register a cooling device with device tree node reference.
1541  * This interface function adds a new thermal cooling device (fan/processor/...)
1542  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1543  * to all the thermal zone devices registered at the same time.
1544  *
1545  * Return: a pointer to the created struct thermal_cooling_device or an
1546  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1547  */
1548 struct thermal_cooling_device *
1549 thermal_of_cooling_device_register(struct device_node *np,
1550                                    char *type, void *devdata,
1551                                    const struct thermal_cooling_device_ops *ops)
1552 {
1553         return __thermal_cooling_device_register(np, type, devdata, ops);
1554 }
1555 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1556
1557 /**
1558  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1559  * @cdev:       the thermal cooling device to remove.
1560  *
1561  * thermal_cooling_device_unregister() must be called when the device is no
1562  * longer needed.
1563  */
1564 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1565 {
1566         int i;
1567         const struct thermal_zone_params *tzp;
1568         struct thermal_zone_device *tz;
1569         struct thermal_cooling_device *pos = NULL;
1570
1571         if (!cdev)
1572                 return;
1573
1574         mutex_lock(&thermal_list_lock);
1575         list_for_each_entry(pos, &thermal_cdev_list, node)
1576             if (pos == cdev)
1577                 break;
1578         if (pos != cdev) {
1579                 /* thermal cooling device not found */
1580                 mutex_unlock(&thermal_list_lock);
1581                 return;
1582         }
1583         list_del(&cdev->node);
1584
1585         /* Unbind all thermal zones associated with 'this' cdev */
1586         list_for_each_entry(tz, &thermal_tz_list, node) {
1587                 if (tz->ops->unbind) {
1588                         tz->ops->unbind(tz, cdev);
1589                         continue;
1590                 }
1591
1592                 if (!tz->tzp || !tz->tzp->tbp)
1593                         continue;
1594
1595                 tzp = tz->tzp;
1596                 for (i = 0; i < tzp->num_tbps; i++) {
1597                         if (tzp->tbp[i].cdev == cdev) {
1598                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1599                                 tzp->tbp[i].cdev = NULL;
1600                         }
1601                 }
1602         }
1603
1604         mutex_unlock(&thermal_list_lock);
1605
1606         if (cdev->type[0])
1607                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1608         device_remove_file(&cdev->device, &dev_attr_max_state);
1609         device_remove_file(&cdev->device, &dev_attr_cur_state);
1610
1611         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1612         device_unregister(&cdev->device);
1613         return;
1614 }
1615 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1616
1617 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1618 {
1619         struct thermal_instance *instance;
1620         unsigned long target = 0;
1621
1622         /* cooling device is updated*/
1623         if (cdev->updated)
1624                 return;
1625
1626         mutex_lock(&cdev->lock);
1627         /* Make sure cdev enters the deepest cooling state */
1628         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1629                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1630                                 instance->tz->id, instance->target);
1631                 if (instance->target == THERMAL_NO_TARGET)
1632                         continue;
1633                 if (instance->target > target)
1634                         target = instance->target;
1635         }
1636         mutex_unlock(&cdev->lock);
1637         cdev->ops->set_cur_state(cdev, target);
1638         cdev->updated = true;
1639         trace_cdev_update(cdev, target);
1640         dev_dbg(&cdev->device, "set to state %lu\n", target);
1641 }
1642 EXPORT_SYMBOL(thermal_cdev_update);
1643
1644 /**
1645  * thermal_notify_framework - Sensor drivers use this API to notify framework
1646  * @tz:         thermal zone device
1647  * @trip:       indicates which trip point has been crossed
1648  *
1649  * This function handles the trip events from sensor drivers. It starts
1650  * throttling the cooling devices according to the policy configured.
1651  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1652  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1653  * The throttling policy is based on the configured platform data; if no
1654  * platform data is provided, this uses the step_wise throttling policy.
1655  */
1656 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1657 {
1658         handle_thermal_trip(tz, trip);
1659 }
1660 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1661
1662 /**
1663  * create_trip_attrs() - create attributes for trip points
1664  * @tz:         the thermal zone device
1665  * @mask:       Writeable trip point bitmap.
1666  *
1667  * helper function to instantiate sysfs entries for every trip
1668  * point and its properties of a struct thermal_zone_device.
1669  *
1670  * Return: 0 on success, the proper error value otherwise.
1671  */
1672 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1673 {
1674         int indx;
1675         int size = sizeof(struct thermal_attr) * tz->trips;
1676
1677         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1678         if (!tz->trip_type_attrs)
1679                 return -ENOMEM;
1680
1681         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1682         if (!tz->trip_temp_attrs) {
1683                 kfree(tz->trip_type_attrs);
1684                 return -ENOMEM;
1685         }
1686
1687         if (tz->ops->get_trip_hyst) {
1688                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1689                 if (!tz->trip_hyst_attrs) {
1690                         kfree(tz->trip_type_attrs);
1691                         kfree(tz->trip_temp_attrs);
1692                         return -ENOMEM;
1693                 }
1694         }
1695
1696
1697         for (indx = 0; indx < tz->trips; indx++) {
1698                 /* create trip type attribute */
1699                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1700                          "trip_point_%d_type", indx);
1701
1702                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1703                 tz->trip_type_attrs[indx].attr.attr.name =
1704                                                 tz->trip_type_attrs[indx].name;
1705                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1706                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1707
1708                 device_create_file(&tz->device,
1709                                    &tz->trip_type_attrs[indx].attr);
1710
1711                 /* create trip temp attribute */
1712                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1713                          "trip_point_%d_temp", indx);
1714
1715                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1716                 tz->trip_temp_attrs[indx].attr.attr.name =
1717                                                 tz->trip_temp_attrs[indx].name;
1718                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1719                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1720                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1721                     mask & (1 << indx)) {
1722                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1723                         tz->trip_temp_attrs[indx].attr.store =
1724                                                         trip_point_temp_store;
1725                 }
1726
1727                 device_create_file(&tz->device,
1728                                    &tz->trip_temp_attrs[indx].attr);
1729
1730                 /* create Optional trip hyst attribute */
1731                 if (!tz->ops->get_trip_hyst)
1732                         continue;
1733                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1734                          "trip_point_%d_hyst", indx);
1735
1736                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1737                 tz->trip_hyst_attrs[indx].attr.attr.name =
1738                                         tz->trip_hyst_attrs[indx].name;
1739                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1740                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1741                 if (tz->ops->set_trip_hyst) {
1742                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1743                         tz->trip_hyst_attrs[indx].attr.store =
1744                                         trip_point_hyst_store;
1745                 }
1746
1747                 device_create_file(&tz->device,
1748                                    &tz->trip_hyst_attrs[indx].attr);
1749         }
1750         return 0;
1751 }
1752
1753 static void remove_trip_attrs(struct thermal_zone_device *tz)
1754 {
1755         int indx;
1756
1757         for (indx = 0; indx < tz->trips; indx++) {
1758                 device_remove_file(&tz->device,
1759                                    &tz->trip_type_attrs[indx].attr);
1760                 device_remove_file(&tz->device,
1761                                    &tz->trip_temp_attrs[indx].attr);
1762                 if (tz->ops->get_trip_hyst)
1763                         device_remove_file(&tz->device,
1764                                   &tz->trip_hyst_attrs[indx].attr);
1765         }
1766         kfree(tz->trip_type_attrs);
1767         kfree(tz->trip_temp_attrs);
1768         kfree(tz->trip_hyst_attrs);
1769 }
1770
1771 /**
1772  * thermal_zone_device_register() - register a new thermal zone device
1773  * @type:       the thermal zone device type
1774  * @trips:      the number of trip points the thermal zone support
1775  * @mask:       a bit string indicating the writeablility of trip points
1776  * @devdata:    private device data
1777  * @ops:        standard thermal zone device callbacks
1778  * @tzp:        thermal zone platform parameters
1779  * @passive_delay: number of milliseconds to wait between polls when
1780  *                 performing passive cooling
1781  * @polling_delay: number of milliseconds to wait between polls when checking
1782  *                 whether trip points have been crossed (0 for interrupt
1783  *                 driven systems)
1784  *
1785  * This interface function adds a new thermal zone device (sensor) to
1786  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1787  * thermal cooling devices registered at the same time.
1788  * thermal_zone_device_unregister() must be called when the device is no
1789  * longer needed. The passive cooling depends on the .get_trend() return value.
1790  *
1791  * Return: a pointer to the created struct thermal_zone_device or an
1792  * in case of error, an ERR_PTR. Caller must check return value with
1793  * IS_ERR*() helpers.
1794  */
1795 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1796         int trips, int mask, void *devdata,
1797         struct thermal_zone_device_ops *ops,
1798         struct thermal_zone_params *tzp,
1799         int passive_delay, int polling_delay)
1800 {
1801         struct thermal_zone_device *tz;
1802         enum thermal_trip_type trip_type;
1803         int result;
1804         int count;
1805         int passive = 0;
1806         struct thermal_governor *governor;
1807
1808         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1809                 return ERR_PTR(-EINVAL);
1810
1811         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1812                 return ERR_PTR(-EINVAL);
1813
1814         if (!ops)
1815                 return ERR_PTR(-EINVAL);
1816
1817         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1818                 return ERR_PTR(-EINVAL);
1819
1820         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1821         if (!tz)
1822                 return ERR_PTR(-ENOMEM);
1823
1824         INIT_LIST_HEAD(&tz->thermal_instances);
1825         idr_init(&tz->idr);
1826         mutex_init(&tz->lock);
1827         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1828         if (result) {
1829                 kfree(tz);
1830                 return ERR_PTR(result);
1831         }
1832
1833         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1834         tz->ops = ops;
1835         tz->tzp = tzp;
1836         tz->device.class = &thermal_class;
1837         tz->devdata = devdata;
1838         tz->trips = trips;
1839         tz->passive_delay = passive_delay;
1840         tz->polling_delay = polling_delay;
1841         /* A new thermal zone needs to be updated anyway. */
1842         atomic_set(&tz->need_update, 1);
1843
1844         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1845         result = device_register(&tz->device);
1846         if (result) {
1847                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1848                 kfree(tz);
1849                 return ERR_PTR(result);
1850         }
1851
1852         /* sys I/F */
1853         if (type) {
1854                 result = device_create_file(&tz->device, &dev_attr_type);
1855                 if (result)
1856                         goto unregister;
1857         }
1858
1859         result = device_create_file(&tz->device, &dev_attr_temp);
1860         if (result)
1861                 goto unregister;
1862
1863         if (ops->get_mode) {
1864                 result = device_create_file(&tz->device, &dev_attr_mode);
1865                 if (result)
1866                         goto unregister;
1867         }
1868
1869         result = create_trip_attrs(tz, mask);
1870         if (result)
1871                 goto unregister;
1872
1873         for (count = 0; count < trips; count++) {
1874                 tz->ops->get_trip_type(tz, count, &trip_type);
1875                 if (trip_type == THERMAL_TRIP_PASSIVE)
1876                         passive = 1;
1877         }
1878
1879         if (!passive) {
1880                 result = device_create_file(&tz->device, &dev_attr_passive);
1881                 if (result)
1882                         goto unregister;
1883         }
1884
1885         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1886                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1887                 if (result)
1888                         goto unregister;
1889         }
1890
1891         /* Create policy attribute */
1892         result = device_create_file(&tz->device, &dev_attr_policy);
1893         if (result)
1894                 goto unregister;
1895
1896         /* Add thermal zone params */
1897         result = create_tzp_attrs(&tz->device);
1898         if (result)
1899                 goto unregister;
1900
1901         /* Create available_policies attribute */
1902         result = device_create_file(&tz->device, &dev_attr_available_policies);
1903         if (result)
1904                 goto unregister;
1905
1906         /* Update 'this' zone's governor information */
1907         mutex_lock(&thermal_governor_lock);
1908
1909         if (tz->tzp)
1910                 governor = __find_governor(tz->tzp->governor_name);
1911         else
1912                 governor = def_governor;
1913
1914         result = thermal_set_governor(tz, governor);
1915         if (result) {
1916                 mutex_unlock(&thermal_governor_lock);
1917                 goto unregister;
1918         }
1919
1920         mutex_unlock(&thermal_governor_lock);
1921
1922         if (!tz->tzp || !tz->tzp->no_hwmon) {
1923                 result = thermal_add_hwmon_sysfs(tz);
1924                 if (result)
1925                         goto unregister;
1926         }
1927
1928         mutex_lock(&thermal_list_lock);
1929         list_add_tail(&tz->node, &thermal_tz_list);
1930         mutex_unlock(&thermal_list_lock);
1931
1932         /* Bind cooling devices for this zone */
1933         bind_tz(tz);
1934
1935         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1936
1937         thermal_zone_device_reset(tz);
1938         /* Update the new thermal zone and mark it as already updated. */
1939         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1940                 thermal_zone_device_update(tz);
1941
1942         return tz;
1943
1944 unregister:
1945         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1946         device_unregister(&tz->device);
1947         return ERR_PTR(result);
1948 }
1949 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1950
1951 /**
1952  * thermal_device_unregister - removes the registered thermal zone device
1953  * @tz: the thermal zone device to remove
1954  */
1955 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1956 {
1957         int i;
1958         const struct thermal_zone_params *tzp;
1959         struct thermal_cooling_device *cdev;
1960         struct thermal_zone_device *pos = NULL;
1961
1962         if (!tz)
1963                 return;
1964
1965         tzp = tz->tzp;
1966
1967         mutex_lock(&thermal_list_lock);
1968         list_for_each_entry(pos, &thermal_tz_list, node)
1969             if (pos == tz)
1970                 break;
1971         if (pos != tz) {
1972                 /* thermal zone device not found */
1973                 mutex_unlock(&thermal_list_lock);
1974                 return;
1975         }
1976         list_del(&tz->node);
1977
1978         /* Unbind all cdevs associated with 'this' thermal zone */
1979         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1980                 if (tz->ops->unbind) {
1981                         tz->ops->unbind(tz, cdev);
1982                         continue;
1983                 }
1984
1985                 if (!tzp || !tzp->tbp)
1986                         break;
1987
1988                 for (i = 0; i < tzp->num_tbps; i++) {
1989                         if (tzp->tbp[i].cdev == cdev) {
1990                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1991                                 tzp->tbp[i].cdev = NULL;
1992                         }
1993                 }
1994         }
1995
1996         mutex_unlock(&thermal_list_lock);
1997
1998         thermal_zone_device_set_polling(tz, 0);
1999
2000         if (tz->type[0])
2001                 device_remove_file(&tz->device, &dev_attr_type);
2002         device_remove_file(&tz->device, &dev_attr_temp);
2003         if (tz->ops->get_mode)
2004                 device_remove_file(&tz->device, &dev_attr_mode);
2005         device_remove_file(&tz->device, &dev_attr_policy);
2006         device_remove_file(&tz->device, &dev_attr_available_policies);
2007         remove_trip_attrs(tz);
2008         thermal_set_governor(tz, NULL);
2009
2010         thermal_remove_hwmon_sysfs(tz);
2011         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2012         idr_destroy(&tz->idr);
2013         mutex_destroy(&tz->lock);
2014         device_unregister(&tz->device);
2015         return;
2016 }
2017 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2018
2019 /**
2020  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2021  * @name: thermal zone name to fetch the temperature
2022  *
2023  * When only one zone is found with the passed name, returns a reference to it.
2024  *
2025  * Return: On success returns a reference to an unique thermal zone with
2026  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2027  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2028  */
2029 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2030 {
2031         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2032         unsigned int found = 0;
2033
2034         if (!name)
2035                 goto exit;
2036
2037         mutex_lock(&thermal_list_lock);
2038         list_for_each_entry(pos, &thermal_tz_list, node)
2039                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2040                         found++;
2041                         ref = pos;
2042                 }
2043         mutex_unlock(&thermal_list_lock);
2044
2045         /* nothing has been found, thus an error code for it */
2046         if (found == 0)
2047                 ref = ERR_PTR(-ENODEV);
2048         else if (found > 1)
2049         /* Success only when an unique zone is found */
2050                 ref = ERR_PTR(-EEXIST);
2051
2052 exit:
2053         return ref;
2054 }
2055 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2056
2057 #ifdef CONFIG_NET
2058 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2059         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2060 };
2061
2062 static struct genl_family thermal_event_genl_family = {
2063         .id = GENL_ID_GENERATE,
2064         .name = THERMAL_GENL_FAMILY_NAME,
2065         .version = THERMAL_GENL_VERSION,
2066         .maxattr = THERMAL_GENL_ATTR_MAX,
2067         .mcgrps = thermal_event_mcgrps,
2068         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2069 };
2070
2071 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2072                                         enum events event)
2073 {
2074         struct sk_buff *skb;
2075         struct nlattr *attr;
2076         struct thermal_genl_event *thermal_event;
2077         void *msg_header;
2078         int size;
2079         int result;
2080         static unsigned int thermal_event_seqnum;
2081
2082         if (!tz)
2083                 return -EINVAL;
2084
2085         /* allocate memory */
2086         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2087                nla_total_size(0);
2088
2089         skb = genlmsg_new(size, GFP_ATOMIC);
2090         if (!skb)
2091                 return -ENOMEM;
2092
2093         /* add the genetlink message header */
2094         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2095                                  &thermal_event_genl_family, 0,
2096                                  THERMAL_GENL_CMD_EVENT);
2097         if (!msg_header) {
2098                 nlmsg_free(skb);
2099                 return -ENOMEM;
2100         }
2101
2102         /* fill the data */
2103         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2104                            sizeof(struct thermal_genl_event));
2105
2106         if (!attr) {
2107                 nlmsg_free(skb);
2108                 return -EINVAL;
2109         }
2110
2111         thermal_event = nla_data(attr);
2112         if (!thermal_event) {
2113                 nlmsg_free(skb);
2114                 return -EINVAL;
2115         }
2116
2117         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2118
2119         thermal_event->orig = tz->id;
2120         thermal_event->event = event;
2121
2122         /* send multicast genetlink message */
2123         genlmsg_end(skb, msg_header);
2124
2125         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2126                                    0, GFP_ATOMIC);
2127         if (result)
2128                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2129
2130         return result;
2131 }
2132 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2133
2134 static int genetlink_init(void)
2135 {
2136         return genl_register_family(&thermal_event_genl_family);
2137 }
2138
2139 static void genetlink_exit(void)
2140 {
2141         genl_unregister_family(&thermal_event_genl_family);
2142 }
2143 #else /* !CONFIG_NET */
2144 static inline int genetlink_init(void) { return 0; }
2145 static inline void genetlink_exit(void) {}
2146 #endif /* !CONFIG_NET */
2147
2148 static int __init thermal_register_governors(void)
2149 {
2150         int result;
2151
2152         result = thermal_gov_step_wise_register();
2153         if (result)
2154                 return result;
2155
2156         result = thermal_gov_fair_share_register();
2157         if (result)
2158                 return result;
2159
2160         result = thermal_gov_bang_bang_register();
2161         if (result)
2162                 return result;
2163
2164         result = thermal_gov_user_space_register();
2165         if (result)
2166                 return result;
2167
2168         return thermal_gov_power_allocator_register();
2169 }
2170
2171 static void thermal_unregister_governors(void)
2172 {
2173         thermal_gov_step_wise_unregister();
2174         thermal_gov_fair_share_unregister();
2175         thermal_gov_bang_bang_unregister();
2176         thermal_gov_user_space_unregister();
2177         thermal_gov_power_allocator_unregister();
2178 }
2179
2180 static int thermal_pm_notify(struct notifier_block *nb,
2181                                 unsigned long mode, void *_unused)
2182 {
2183         struct thermal_zone_device *tz;
2184
2185         switch (mode) {
2186         case PM_HIBERNATION_PREPARE:
2187         case PM_RESTORE_PREPARE:
2188         case PM_SUSPEND_PREPARE:
2189                 atomic_set(&in_suspend, 1);
2190                 break;
2191         case PM_POST_HIBERNATION:
2192         case PM_POST_RESTORE:
2193         case PM_POST_SUSPEND:
2194                 atomic_set(&in_suspend, 0);
2195                 list_for_each_entry(tz, &thermal_tz_list, node) {
2196                         thermal_zone_device_reset(tz);
2197                         thermal_zone_device_update(tz);
2198                 }
2199                 break;
2200         default:
2201                 break;
2202         }
2203         return 0;
2204 }
2205
2206 static struct notifier_block thermal_pm_nb = {
2207         .notifier_call = thermal_pm_notify,
2208 };
2209
2210 static int __init thermal_init(void)
2211 {
2212         int result;
2213
2214         result = thermal_register_governors();
2215         if (result)
2216                 goto error;
2217
2218         result = class_register(&thermal_class);
2219         if (result)
2220                 goto unregister_governors;
2221
2222         result = genetlink_init();
2223         if (result)
2224                 goto unregister_class;
2225
2226         result = of_parse_thermal_zones();
2227         if (result)
2228                 goto exit_netlink;
2229
2230         result = register_pm_notifier(&thermal_pm_nb);
2231         if (result)
2232                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2233                         result);
2234
2235         return 0;
2236
2237 exit_netlink:
2238         genetlink_exit();
2239 unregister_class:
2240         class_unregister(&thermal_class);
2241 unregister_governors:
2242         thermal_unregister_governors();
2243 error:
2244         idr_destroy(&thermal_tz_idr);
2245         idr_destroy(&thermal_cdev_idr);
2246         mutex_destroy(&thermal_idr_lock);
2247         mutex_destroy(&thermal_list_lock);
2248         mutex_destroy(&thermal_governor_lock);
2249         return result;
2250 }
2251
2252 static void __exit thermal_exit(void)
2253 {
2254         unregister_pm_notifier(&thermal_pm_nb);
2255         of_thermal_destroy_zones();
2256         genetlink_exit();
2257         class_unregister(&thermal_class);
2258         thermal_unregister_governors();
2259         idr_destroy(&thermal_tz_idr);
2260         idr_destroy(&thermal_cdev_idr);
2261         mutex_destroy(&thermal_idr_lock);
2262         mutex_destroy(&thermal_list_lock);
2263         mutex_destroy(&thermal_governor_lock);
2264 }
2265
2266 fs_initcall(thermal_init);
2267 module_exit(thermal_exit);