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 thermal_zone_set_trips(struct thermal_zone_device *tz)
 520 {
 521         int low = -INT_MAX;
 522         int high = INT_MAX;
 523         int trip_temp, hysteresis;
 524         int temp = tz->temperature;
 525         int i, ret;
 526
 527         if (!tz->ops->set_trips)
 528                 return;
 529
 530         for (i = 0; i < tz->trips; i++) {
 531                 int trip_low;
 532
 533                 tz->ops->get_trip_temp(tz, i, &trip_temp);
 534                 tz->ops->get_trip_hyst(tz, i, &hysteresis);
 535
 536                 trip_low = trip_temp - hysteresis;
 537
 538                 if (trip_low < temp && trip_low > low)
 539                         low = trip_low;
 540
 541                 if (trip_temp > temp && trip_temp < high)
 542                         high = trip_temp;
 543         }
 544
 545         /* No need to change trip points */
 546         if (tz->prev_low_trip == low && tz->prev_high_trip == high)
 547                 return;
 548
 549         tz->prev_low_trip = low;
 550         tz->prev_high_trip = high;
 551
 552         dev_dbg(&tz->device, "new temperature boundaries: %d < x < %d\n",
 553                         low, high);
 554
 555         ret = tz->ops->set_trips(tz, low, high);
 556         if (ret)
 557                 dev_err(&tz->device, "Failed to set trips: %d\n", ret);
 558 }
 559
 560 static void update_temperature(struct thermal_zone_device *tz)
 561 {
 562         int temp, ret;
 563
 564         ret = thermal_zone_get_temp(tz, &temp);
 565         if (ret) {
 566                 if (ret != -EAGAIN)
 567                         dev_warn(&tz->device,
 568                                  "failed to read out thermal zone (%d)\n",
 569                                  ret);
 570                 return;
 571         }
 572
 573         mutex_lock(&tz->lock);
 574         tz->last_temperature = tz->temperature;
 575         tz->temperature = temp;
 576         mutex_unlock(&tz->lock);
 577
 578         trace_thermal_temperature(tz);
 579         if (tz->last_temperature == THERMAL_TEMP_INVALID)
 580                 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
 581                         tz->temperature);
 582         else
 583                 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 584                         tz->last_temperature, tz->temperature);
 585 }
 586
 587 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 588 {
 589         struct thermal_instance *pos;
 590
 591         tz->temperature = THERMAL_TEMP_INVALID;
 592         tz->passive = 0;
 593         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 594                 pos->initialized = false;
 595 }
 596
 597 void thermal_zone_device_update(struct thermal_zone_device *tz)
 598 {
 599         int count;
 600
 601         if (atomic_read(&in_suspend))
 602                 return;
 603
 604         if (!tz->ops->get_temp)
 605                 return;
 606
 607         update_temperature(tz);
 608
 609         thermal_zone_set_trips(tz);
 610
 611         for (count = 0; count < tz->trips; count++)
 612                 handle_thermal_trip(tz, count);
 613 }
 614 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 615
 616 static void thermal_zone_device_check(struct work_struct *work)
 617 {
 618         struct thermal_zone_device *tz = container_of(work, struct
 619                                                       thermal_zone_device,
 620                                                       poll_queue.work);
 621         thermal_zone_device_update(tz);
 622 }
 623
 624 /* sys I/F for thermal zone */
 625
 626 #define to_thermal_zone(_dev) \
 627         container_of(_dev, struct thermal_zone_device, device)
 628
 629 static ssize_t
 630 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 631 {
 632         struct thermal_zone_device *tz = to_thermal_zone(dev);
 633
 634         return sprintf(buf, "%s\n", tz->type);
 635 }
 636
 637 static ssize_t
 638 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 639 {
 640         struct thermal_zone_device *tz = to_thermal_zone(dev);
 641         int temperature, ret;
 642
 643         ret = thermal_zone_get_temp(tz, &temperature);
 644
 645         if (ret)
 646                 return ret;
 647
 648         return sprintf(buf, "%d\n", temperature);
 649 }
 650
 651 static ssize_t
 652 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 653 {
 654         struct thermal_zone_device *tz = to_thermal_zone(dev);
 655         enum thermal_device_mode mode;
 656         int result;
 657
 658         if (!tz->ops->get_mode)
 659                 return -EPERM;
 660
 661         result = tz->ops->get_mode(tz, &mode);
 662         if (result)
 663                 return result;
 664
 665         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 666                        : "disabled");
 667 }
 668
 669 static ssize_t
 670 mode_store(struct device *dev, struct device_attribute *attr,
 671            const char *buf, size_t count)
 672 {
 673         struct thermal_zone_device *tz = to_thermal_zone(dev);
 674         int result;
 675
 676         if (!tz->ops->set_mode)
 677                 return -EPERM;
 678
 679         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 680                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 681         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 682                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 683         else
 684                 result = -EINVAL;
 685
 686         if (result)
 687                 return result;
 688
 689         return count;
 690 }
 691
 692 static ssize_t
 693 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 694                      char *buf)
 695 {
 696         struct thermal_zone_device *tz = to_thermal_zone(dev);
 697         enum thermal_trip_type type;
 698         int trip, result;
 699
 700         if (!tz->ops->get_trip_type)
 701                 return -EPERM;
 702
 703         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 704                 return -EINVAL;
 705
 706         result = tz->ops->get_trip_type(tz, trip, &type);
 707         if (result)
 708                 return result;
 709
 710         switch (type) {
 711         case THERMAL_TRIP_CRITICAL:
 712                 return sprintf(buf, "critical\n");
 713         case THERMAL_TRIP_HOT:
 714                 return sprintf(buf, "hot\n");
 715         case THERMAL_TRIP_PASSIVE:
 716                 return sprintf(buf, "passive\n");
 717         case THERMAL_TRIP_ACTIVE:
 718                 return sprintf(buf, "active\n");
 719         default:
 720                 return sprintf(buf, "unknown\n");
 721         }
 722 }
 723
 724 static ssize_t
 725 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 726                      const char *buf, size_t count)
 727 {
 728         struct thermal_zone_device *tz = to_thermal_zone(dev);
 729         int trip, ret;
 730         unsigned long temperature;
 731
 732         if (!tz->ops->set_trip_temp)
 733                 return -EPERM;
 734
 735         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 736                 return -EINVAL;
 737
 738         if (kstrtoul(buf, 10, &temperature))
 739                 return -EINVAL;
 740
 741         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 742
 743         if (!ret)
 744                 thermal_zone_set_trips(tz);
 745
 746         return ret ? ret : count;
 747 }
 748
 749 static ssize_t
 750 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 751                      char *buf)
 752 {
 753         struct thermal_zone_device *tz = to_thermal_zone(dev);
 754         int trip, ret;
 755         int temperature;
 756
 757         if (!tz->ops->get_trip_temp)
 758                 return -EPERM;
 759
 760         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 761                 return -EINVAL;
 762
 763         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 764
 765         if (ret)
 766                 return ret;
 767
 768         return sprintf(buf, "%d\n", temperature);
 769 }
 770
 771 static ssize_t
 772 trip_point_hyst_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         int trip, ret;
 777         int temperature;
 778
 779         if (!tz->ops->set_trip_hyst)
 780                 return -EPERM;
 781
 782         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 783                 return -EINVAL;
 784
 785         if (kstrtoint(buf, 10, &temperature))
 786                 return -EINVAL;
 787
 788         /*
 789          * We are not doing any check on the 'temperature' value
 790          * here. The driver implementing 'set_trip_hyst' has to
 791          * take care of this.
 792          */
 793         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 794
 795         if (!ret)
 796                 thermal_zone_set_trips(tz);
 797
 798         return ret ? ret : count;
 799 }
 800
 801 static ssize_t
 802 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 803                         char *buf)
 804 {
 805         struct thermal_zone_device *tz = to_thermal_zone(dev);
 806         int trip, ret;
 807         int temperature;
 808
 809         if (!tz->ops->get_trip_hyst)
 810                 return -EPERM;
 811
 812         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 813                 return -EINVAL;
 814
 815         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 816
 817         return ret ? ret : sprintf(buf, "%d\n", temperature);
 818 }
 819
 820 static ssize_t
 821 passive_store(struct device *dev, struct device_attribute *attr,
 822                     const char *buf, size_t count)
 823 {
 824         struct thermal_zone_device *tz = to_thermal_zone(dev);
 825         struct thermal_cooling_device *cdev = NULL;
 826         int state;
 827
 828         if (!sscanf(buf, "%d\n", &state))
 829                 return -EINVAL;
 830
 831         /* sanity check: values below 1000 millicelcius don't make sense
 832          * and can cause the system to go into a thermal heart attack
 833          */
 834         if (state && state < 1000)
 835                 return -EINVAL;
 836
 837         if (state && !tz->forced_passive) {
 838                 mutex_lock(&thermal_list_lock);
 839                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 840                         if (!strncmp("Processor", cdev->type,
 841                                      sizeof("Processor")))
 842                                 thermal_zone_bind_cooling_device(tz,
 843                                                 THERMAL_TRIPS_NONE, cdev,
 844                                                 THERMAL_NO_LIMIT,
 845                                                 THERMAL_NO_LIMIT,
 846                                                 THERMAL_WEIGHT_DEFAULT);
 847                 }
 848                 mutex_unlock(&thermal_list_lock);
 849                 if (!tz->passive_delay)
 850                         tz->passive_delay = 1000;
 851         } else if (!state && tz->forced_passive) {
 852                 mutex_lock(&thermal_list_lock);
 853                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 854                         if (!strncmp("Processor", cdev->type,
 855                                      sizeof("Processor")))
 856                                 thermal_zone_unbind_cooling_device(tz,
 857                                                                    THERMAL_TRIPS_NONE,
 858                                                                    cdev);
 859                 }
 860                 mutex_unlock(&thermal_list_lock);
 861                 tz->passive_delay = 0;
 862         }
 863
 864         tz->forced_passive = state;
 865
 866         thermal_zone_device_update(tz);
 867
 868         return count;
 869 }
 870
 871 static ssize_t
 872 passive_show(struct device *dev, struct device_attribute *attr,
 873                    char *buf)
 874 {
 875         struct thermal_zone_device *tz = to_thermal_zone(dev);
 876
 877         return sprintf(buf, "%d\n", tz->forced_passive);
 878 }
 879
 880 static ssize_t
 881 policy_store(struct device *dev, struct device_attribute *attr,
 882                     const char *buf, size_t count)
 883 {
 884         int ret = -EINVAL;
 885         struct thermal_zone_device *tz = to_thermal_zone(dev);
 886         struct thermal_governor *gov;
 887         char name[THERMAL_NAME_LENGTH];
 888
 889         snprintf(name, sizeof(name), "%s", buf);
 890
 891         mutex_lock(&thermal_governor_lock);
 892         mutex_lock(&tz->lock);
 893
 894         gov = __find_governor(strim(name));
 895         if (!gov)
 896                 goto exit;
 897
 898         ret = thermal_set_governor(tz, gov);
 899         if (!ret)
 900                 ret = count;
 901
 902 exit:
 903         mutex_unlock(&tz->lock);
 904         mutex_unlock(&thermal_governor_lock);
 905         return ret;
 906 }
 907
 908 static ssize_t
 909 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 910 {
 911         struct thermal_zone_device *tz = to_thermal_zone(dev);
 912
 913         return sprintf(buf, "%s\n", tz->governor->name);
 914 }
 915
 916 static ssize_t
 917 available_policies_show(struct device *dev, struct device_attribute *devattr,
 918                         char *buf)
 919 {
 920         struct thermal_governor *pos;
 921         ssize_t count = 0;
 922         ssize_t size = PAGE_SIZE;
 923
 924         mutex_lock(&thermal_governor_lock);
 925
 926         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 927                 size = PAGE_SIZE - count;
 928                 count += scnprintf(buf + count, size, "%s ", pos->name);
 929         }
 930         count += scnprintf(buf + count, size, "\n");
 931
 932         mutex_unlock(&thermal_governor_lock);
 933
 934         return count;
 935 }
 936
 937 static ssize_t
 938 emul_temp_store(struct device *dev, struct device_attribute *attr,
 939                      const char *buf, size_t count)
 940 {
 941         struct thermal_zone_device *tz = to_thermal_zone(dev);
 942         int ret = 0;
 943         unsigned long temperature;
 944
 945         if (kstrtoul(buf, 10, &temperature))
 946                 return -EINVAL;
 947
 948         if (!tz->ops->set_emul_temp) {
 949                 mutex_lock(&tz->lock);
 950                 tz->emul_temperature = temperature;
 951                 mutex_unlock(&tz->lock);
 952         } else {
 953                 ret = tz->ops->set_emul_temp(tz, temperature);
 954         }
 955
 956         if (!ret)
 957                 thermal_zone_device_update(tz);
 958
 959         return ret ? ret : count;
 960 }
 961 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 962
 963 static ssize_t
 964 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 965                        char *buf)
 966 {
 967         struct thermal_zone_device *tz = to_thermal_zone(dev);
 968
 969         if (tz->tzp)
 970                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 971         else
 972                 return -EIO;
 973 }
 974
 975 static ssize_t
 976 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 977                         const char *buf, size_t count)
 978 {
 979         struct thermal_zone_device *tz = to_thermal_zone(dev);
 980         u32 sustainable_power;
 981
 982         if (!tz->tzp)
 983                 return -EIO;
 984
 985         if (kstrtou32(buf, 10, &sustainable_power))
 986                 return -EINVAL;
 987
 988         tz->tzp->sustainable_power = sustainable_power;
 989
 990         return count;
 991 }
 992 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 993                 sustainable_power_store);
 994
 995 #define create_s32_tzp_attr(name)                                       \
 996         static ssize_t                                                  \
 997         name##_show(struct device *dev, struct device_attribute *devattr, \
 998                 char *buf)                                              \
 999         {                                                               \
1000         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
1001                                                                         \
1002         if (tz->tzp)                                                    \
1003                 return sprintf(buf, "%u\n", tz->tzp->name);             \
1004         else                                                            \
1005                 return -EIO;                                            \
1006         }                                                               \
1007                                                                         \
1008         static ssize_t                                                  \
1009         name##_store(struct device *dev, struct device_attribute *devattr, \
1010                 const char *buf, size_t count)                          \
1011         {                                                               \
1012                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
1013                 s32 value;                                              \
1014                                                                         \
1015                 if (!tz->tzp)                                           \
1016                         return -EIO;                                    \
1017                                                                         \
1018                 if (kstrtos32(buf, 10, &value))                         \
1019                         return -EINVAL;                                 \
1020                                                                         \
1021                 tz->tzp->name = value;                                  \
1022                                                                         \
1023                 return count;                                           \
1024         }                                                               \
1025         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
1026
1027 create_s32_tzp_attr(k_po);
1028 create_s32_tzp_attr(k_pu);
1029 create_s32_tzp_attr(k_i);
1030 create_s32_tzp_attr(k_d);
1031 create_s32_tzp_attr(integral_cutoff);
1032 create_s32_tzp_attr(slope);
1033 create_s32_tzp_attr(offset);
1034 #undef create_s32_tzp_attr
1035
1036 static struct device_attribute *dev_tzp_attrs[] = {
1037         &dev_attr_sustainable_power,
1038         &dev_attr_k_po,
1039         &dev_attr_k_pu,
1040         &dev_attr_k_i,
1041         &dev_attr_k_d,
1042         &dev_attr_integral_cutoff,
1043         &dev_attr_slope,
1044         &dev_attr_offset,
1045 };
1046
1047 static int create_tzp_attrs(struct device *dev)
1048 {
1049         int i;
1050
1051         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1052                 int ret;
1053                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1054
1055                 ret = device_create_file(dev, dev_attr);
1056                 if (ret)
1057                         return ret;
1058         }
1059
1060         return 0;
1061 }
1062
1063 /**
1064  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1065  * @cdev:       pointer to &thermal_cooling_device
1066  * @tz:         a valid thermal zone device pointer
1067  * @max_power:  pointer in which to store the maximum power
1068  *
1069  * Calculate the maximum power consumption in milliwats that the
1070  * cooling device can currently consume and store it in @max_power.
1071  *
1072  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1073  * power_actor API or -E* on other error.
1074  */
1075 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1076                               struct thermal_zone_device *tz, u32 *max_power)
1077 {
1078         if (!cdev_is_power_actor(cdev))
1079                 return -EINVAL;
1080
1081         return cdev->ops->state2power(cdev, tz, 0, max_power);
1082 }
1083
1084 /**
1085  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1086  * @cdev:       pointer to &thermal_cooling_device
1087  * @tz:         a valid thermal zone device pointer
1088  * @min_power:  pointer in which to store the minimum power
1089  *
1090  * Calculate the minimum power consumption in milliwatts that the
1091  * cooling device can currently consume and store it in @min_power.
1092  *
1093  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1094  * power_actor API or -E* on other error.
1095  */
1096 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1097                               struct thermal_zone_device *tz, u32 *min_power)
1098 {
1099         unsigned long max_state;
1100         int ret;
1101
1102         if (!cdev_is_power_actor(cdev))
1103                 return -EINVAL;
1104
1105         ret = cdev->ops->get_max_state(cdev, &max_state);
1106         if (ret)
1107                 return ret;
1108
1109         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1110 }
1111
1112 /**
1113  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1114  * @cdev:       pointer to &thermal_cooling_device
1115  * @instance:   thermal instance to update
1116  * @power:      the power in milliwatts
1117  *
1118  * Set the cooling device to consume at most @power milliwatts.
1119  *
1120  * Return: 0 on success, -EINVAL if the cooling device does not
1121  * implement the power actor API or -E* for other failures.
1122  */
1123 int power_actor_set_power(struct thermal_cooling_device *cdev,
1124                           struct thermal_instance *instance, u32 power)
1125 {
1126         unsigned long state;
1127         int ret;
1128
1129         if (!cdev_is_power_actor(cdev))
1130                 return -EINVAL;
1131
1132         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1133         if (ret)
1134                 return ret;
1135
1136         instance->target = state;
1137         cdev->updated = false;
1138         thermal_cdev_update(cdev);
1139
1140         return 0;
1141 }
1142
1143 static DEVICE_ATTR(type, 0444, type_show, NULL);
1144 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1145 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1146 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1147 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1148 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1149
1150 /* sys I/F for cooling device */
1151 #define to_cooling_device(_dev) \
1152         container_of(_dev, struct thermal_cooling_device, device)
1153
1154 static ssize_t
1155 thermal_cooling_device_type_show(struct device *dev,
1156                                  struct device_attribute *attr, char *buf)
1157 {
1158         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1159
1160         return sprintf(buf, "%s\n", cdev->type);
1161 }
1162
1163 static ssize_t
1164 thermal_cooling_device_max_state_show(struct device *dev,
1165                                       struct device_attribute *attr, char *buf)
1166 {
1167         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1168         unsigned long state;
1169         int ret;
1170
1171         ret = cdev->ops->get_max_state(cdev, &state);
1172         if (ret)
1173                 return ret;
1174         return sprintf(buf, "%ld\n", state);
1175 }
1176
1177 static ssize_t
1178 thermal_cooling_device_cur_state_show(struct device *dev,
1179                                       struct device_attribute *attr, char *buf)
1180 {
1181         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1182         unsigned long state;
1183         int ret;
1184
1185         ret = cdev->ops->get_cur_state(cdev, &state);
1186         if (ret)
1187                 return ret;
1188         return sprintf(buf, "%ld\n", state);
1189 }
1190
1191 static ssize_t
1192 thermal_cooling_device_cur_state_store(struct device *dev,
1193                                        struct device_attribute *attr,
1194                                        const char *buf, size_t count)
1195 {
1196         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1197         unsigned long state;
1198         int result;
1199
1200         if (!sscanf(buf, "%ld\n", &state))
1201                 return -EINVAL;
1202
1203         if ((long)state < 0)
1204                 return -EINVAL;
1205
1206         result = cdev->ops->set_cur_state(cdev, state);
1207         if (result)
1208                 return result;
1209         return count;
1210 }
1211
1212 static struct device_attribute dev_attr_cdev_type =
1213 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1214 static DEVICE_ATTR(max_state, 0444,
1215                    thermal_cooling_device_max_state_show, NULL);
1216 static DEVICE_ATTR(cur_state, 0644,
1217                    thermal_cooling_device_cur_state_show,
1218                    thermal_cooling_device_cur_state_store);
1219
1220 static ssize_t
1221 thermal_cooling_device_trip_point_show(struct device *dev,
1222                                        struct device_attribute *attr, char *buf)
1223 {
1224         struct thermal_instance *instance;
1225
1226         instance =
1227             container_of(attr, struct thermal_instance, attr);
1228
1229         if (instance->trip == THERMAL_TRIPS_NONE)
1230                 return sprintf(buf, "-1\n");
1231         else
1232                 return sprintf(buf, "%d\n", instance->trip);
1233 }
1234
1235 static struct attribute *cooling_device_attrs[] = {
1236         &dev_attr_cdev_type.attr,
1237         &dev_attr_max_state.attr,
1238         &dev_attr_cur_state.attr,
1239         NULL,
1240 };
1241
1242 static const struct attribute_group cooling_device_attr_group = {
1243         .attrs = cooling_device_attrs,
1244 };
1245
1246 static const struct attribute_group *cooling_device_attr_groups[] = {
1247         &cooling_device_attr_group,
1248         NULL,
1249 };
1250
1251 static ssize_t
1252 thermal_cooling_device_weight_show(struct device *dev,
1253                                    struct device_attribute *attr, char *buf)
1254 {
1255         struct thermal_instance *instance;
1256
1257         instance = container_of(attr, struct thermal_instance, weight_attr);
1258
1259         return sprintf(buf, "%d\n", instance->weight);
1260 }
1261
1262 static ssize_t
1263 thermal_cooling_device_weight_store(struct device *dev,
1264                                     struct device_attribute *attr,
1265                                     const char *buf, size_t count)
1266 {
1267         struct thermal_instance *instance;
1268         int ret, weight;
1269
1270         ret = kstrtoint(buf, 0, &weight);
1271         if (ret)
1272                 return ret;
1273
1274         instance = container_of(attr, struct thermal_instance, weight_attr);
1275         instance->weight = weight;
1276
1277         return count;
1278 }
1279 /* Device management */
1280
1281 /**
1282  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1283  * @tz:         pointer to struct thermal_zone_device
1284  * @trip:       indicates which trip point the cooling devices is
1285  *              associated with in this thermal zone.
1286  * @cdev:       pointer to struct thermal_cooling_device
1287  * @upper:      the Maximum cooling state for this trip point.
1288  *              THERMAL_NO_LIMIT means no upper limit,
1289  *              and the cooling device can be in max_state.
1290  * @lower:      the Minimum cooling state can be used for this trip point.
1291  *              THERMAL_NO_LIMIT means no lower limit,
1292  *              and the cooling device can be in cooling state 0.
1293  * @weight:     The weight of the cooling device to be bound to the
1294  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1295  *              default value
1296  *
1297  * This interface function bind a thermal cooling device to the certain trip
1298  * point of a thermal zone device.
1299  * This function is usually called in the thermal zone device .bind callback.
1300  *
1301  * Return: 0 on success, the proper error value otherwise.
1302  */
1303 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1304                                      int trip,
1305                                      struct thermal_cooling_device *cdev,
1306                                      unsigned long upper, unsigned long lower,
1307                                      unsigned int weight)
1308 {
1309         struct thermal_instance *dev;
1310         struct thermal_instance *pos;
1311         struct thermal_zone_device *pos1;
1312         struct thermal_cooling_device *pos2;
1313         unsigned long max_state;
1314         int result, ret;
1315
1316         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1317                 return -EINVAL;
1318
1319         list_for_each_entry(pos1, &thermal_tz_list, node) {
1320                 if (pos1 == tz)
1321                         break;
1322         }
1323         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1324                 if (pos2 == cdev)
1325                         break;
1326         }
1327
1328         if (tz != pos1 || cdev != pos2)
1329                 return -EINVAL;
1330
1331         ret = cdev->ops->get_max_state(cdev, &max_state);
1332         if (ret)
1333                 return ret;
1334
1335         /* lower default 0, upper default max_state */
1336         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1337         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1338
1339         if (lower > upper || upper > max_state)
1340                 return -EINVAL;
1341
1342         dev =
1343             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1344         if (!dev)
1345                 return -ENOMEM;
1346         dev->tz = tz;
1347         dev->cdev = cdev;
1348         dev->trip = trip;
1349         dev->upper = upper;
1350         dev->lower = lower;
1351         dev->target = THERMAL_NO_TARGET;
1352         dev->weight = weight;
1353
1354         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1355         if (result)
1356                 goto free_mem;
1357
1358         sprintf(dev->name, "cdev%d", dev->id);
1359         result =
1360             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1361         if (result)
1362                 goto release_idr;
1363
1364         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1365         sysfs_attr_init(&dev->attr.attr);
1366         dev->attr.attr.name = dev->attr_name;
1367         dev->attr.attr.mode = 0444;
1368         dev->attr.show = thermal_cooling_device_trip_point_show;
1369         result = device_create_file(&tz->device, &dev->attr);
1370         if (result)
1371                 goto remove_symbol_link;
1372
1373         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1374         sysfs_attr_init(&dev->weight_attr.attr);
1375         dev->weight_attr.attr.name = dev->weight_attr_name;
1376         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1377         dev->weight_attr.show = thermal_cooling_device_weight_show;
1378         dev->weight_attr.store = thermal_cooling_device_weight_store;
1379         result = device_create_file(&tz->device, &dev->weight_attr);
1380         if (result)
1381                 goto remove_trip_file;
1382
1383         mutex_lock(&tz->lock);
1384         mutex_lock(&cdev->lock);
1385         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1386             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1387                 result = -EEXIST;
1388                 break;
1389         }
1390         if (!result) {
1391                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1392                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1393                 atomic_set(&tz->need_update, 1);
1394         }
1395         mutex_unlock(&cdev->lock);
1396         mutex_unlock(&tz->lock);
1397
1398         if (!result)
1399                 return 0;
1400
1401         device_remove_file(&tz->device, &dev->weight_attr);
1402 remove_trip_file:
1403         device_remove_file(&tz->device, &dev->attr);
1404 remove_symbol_link:
1405         sysfs_remove_link(&tz->device.kobj, dev->name);
1406 release_idr:
1407         release_idr(&tz->idr, &tz->lock, dev->id);
1408 free_mem:
1409         kfree(dev);
1410         return result;
1411 }
1412 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1413
1414 /**
1415  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1416  *                                        thermal zone.
1417  * @tz:         pointer to a struct thermal_zone_device.
1418  * @trip:       indicates which trip point the cooling devices is
1419  *              associated with in this thermal zone.
1420  * @cdev:       pointer to a struct thermal_cooling_device.
1421  *
1422  * This interface function unbind a thermal cooling device from the certain
1423  * trip point of a thermal zone device.
1424  * This function is usually called in the thermal zone device .unbind callback.
1425  *
1426  * Return: 0 on success, the proper error value otherwise.
1427  */
1428 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1429                                        int trip,
1430                                        struct thermal_cooling_device *cdev)
1431 {
1432         struct thermal_instance *pos, *next;
1433
1434         mutex_lock(&tz->lock);
1435         mutex_lock(&cdev->lock);
1436         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1437                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1438                         list_del(&pos->tz_node);
1439                         list_del(&pos->cdev_node);
1440                         mutex_unlock(&cdev->lock);
1441                         mutex_unlock(&tz->lock);
1442                         goto unbind;
1443                 }
1444         }
1445         mutex_unlock(&cdev->lock);
1446         mutex_unlock(&tz->lock);
1447
1448         return -ENODEV;
1449
1450 unbind:
1451         device_remove_file(&tz->device, &pos->weight_attr);
1452         device_remove_file(&tz->device, &pos->attr);
1453         sysfs_remove_link(&tz->device.kobj, pos->name);
1454         release_idr(&tz->idr, &tz->lock, pos->id);
1455         kfree(pos);
1456         return 0;
1457 }
1458 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1459
1460 static void thermal_release(struct device *dev)
1461 {
1462         struct thermal_zone_device *tz;
1463         struct thermal_cooling_device *cdev;
1464
1465         if (!strncmp(dev_name(dev), "thermal_zone",
1466                      sizeof("thermal_zone") - 1)) {
1467                 tz = to_thermal_zone(dev);
1468                 kfree(tz);
1469         } else if(!strncmp(dev_name(dev), "cooling_device",
1470                         sizeof("cooling_device") - 1)){
1471                 cdev = to_cooling_device(dev);
1472                 kfree(cdev);
1473         }
1474 }
1475
1476 static struct class thermal_class = {
1477         .name = "thermal",
1478         .dev_release = thermal_release,
1479 };
1480
1481 /**
1482  * __thermal_cooling_device_register() - register a new thermal cooling device
1483  * @np:         a pointer to a device tree node.
1484  * @type:       the thermal cooling device type.
1485  * @devdata:    device private data.
1486  * @ops:                standard thermal cooling devices callbacks.
1487  *
1488  * This interface function adds a new thermal cooling device (fan/processor/...)
1489  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1490  * to all the thermal zone devices registered at the same time.
1491  * It also gives the opportunity to link the cooling device to a device tree
1492  * node, so that it can be bound to a thermal zone created out of device tree.
1493  *
1494  * Return: a pointer to the created struct thermal_cooling_device or an
1495  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1496  */
1497 static struct thermal_cooling_device *
1498 __thermal_cooling_device_register(struct device_node *np,
1499                                   char *type, void *devdata,
1500                                   const struct thermal_cooling_device_ops *ops)
1501 {
1502         struct thermal_cooling_device *cdev;
1503         struct thermal_zone_device *pos = NULL;
1504         int result;
1505
1506         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1507                 return ERR_PTR(-EINVAL);
1508
1509         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1510             !ops->set_cur_state)
1511                 return ERR_PTR(-EINVAL);
1512
1513         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1514         if (!cdev)
1515                 return ERR_PTR(-ENOMEM);
1516
1517         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1518         if (result) {
1519                 kfree(cdev);
1520                 return ERR_PTR(result);
1521         }
1522
1523         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1524         mutex_init(&cdev->lock);
1525         INIT_LIST_HEAD(&cdev->thermal_instances);
1526         cdev->np = np;
1527         cdev->ops = ops;
1528         cdev->updated = false;
1529         cdev->device.class = &thermal_class;
1530         cdev->device.groups = cooling_device_attr_groups;
1531         cdev->devdata = devdata;
1532         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1533         result = device_register(&cdev->device);
1534         if (result) {
1535                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1536                 kfree(cdev);
1537                 return ERR_PTR(result);
1538         }
1539
1540         /* Add 'this' new cdev to the global cdev list */
1541         mutex_lock(&thermal_list_lock);
1542         list_add(&cdev->node, &thermal_cdev_list);
1543         mutex_unlock(&thermal_list_lock);
1544
1545         /* Update binding information for 'this' new cdev */
1546         bind_cdev(cdev);
1547
1548         mutex_lock(&thermal_list_lock);
1549         list_for_each_entry(pos, &thermal_tz_list, node)
1550                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1551                         thermal_zone_device_update(pos);
1552         mutex_unlock(&thermal_list_lock);
1553
1554         return cdev;
1555 }
1556
1557 /**
1558  * thermal_cooling_device_register() - register a new thermal cooling device
1559  * @type:       the thermal cooling device type.
1560  * @devdata:    device private data.
1561  * @ops:                standard thermal cooling devices callbacks.
1562  *
1563  * This interface function adds a new thermal cooling device (fan/processor/...)
1564  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1565  * to all the thermal zone devices registered at the same time.
1566  *
1567  * Return: a pointer to the created struct thermal_cooling_device or an
1568  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1569  */
1570 struct thermal_cooling_device *
1571 thermal_cooling_device_register(char *type, void *devdata,
1572                                 const struct thermal_cooling_device_ops *ops)
1573 {
1574         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1575 }
1576 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1577
1578 /**
1579  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1580  * @np:         a pointer to a device tree node.
1581  * @type:       the thermal cooling device type.
1582  * @devdata:    device private data.
1583  * @ops:                standard thermal cooling devices callbacks.
1584  *
1585  * This function will register a cooling device with device tree node reference.
1586  * This interface function adds a new thermal cooling device (fan/processor/...)
1587  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1588  * to all the thermal zone devices registered at the same time.
1589  *
1590  * Return: a pointer to the created struct thermal_cooling_device or an
1591  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1592  */
1593 struct thermal_cooling_device *
1594 thermal_of_cooling_device_register(struct device_node *np,
1595                                    char *type, void *devdata,
1596                                    const struct thermal_cooling_device_ops *ops)
1597 {
1598         return __thermal_cooling_device_register(np, type, devdata, ops);
1599 }
1600 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1601
1602 /**
1603  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1604  * @cdev:       the thermal cooling device to remove.
1605  *
1606  * thermal_cooling_device_unregister() must be called when the device is no
1607  * longer needed.
1608  */
1609 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1610 {
1611         int i;
1612         const struct thermal_zone_params *tzp;
1613         struct thermal_zone_device *tz;
1614         struct thermal_cooling_device *pos = NULL;
1615
1616         if (!cdev)
1617                 return;
1618
1619         mutex_lock(&thermal_list_lock);
1620         list_for_each_entry(pos, &thermal_cdev_list, node)
1621             if (pos == cdev)
1622                 break;
1623         if (pos != cdev) {
1624                 /* thermal cooling device not found */
1625                 mutex_unlock(&thermal_list_lock);
1626                 return;
1627         }
1628         list_del(&cdev->node);
1629
1630         /* Unbind all thermal zones associated with 'this' cdev */
1631         list_for_each_entry(tz, &thermal_tz_list, node) {
1632                 if (tz->ops->unbind) {
1633                         tz->ops->unbind(tz, cdev);
1634                         continue;
1635                 }
1636
1637                 if (!tz->tzp || !tz->tzp->tbp)
1638                         continue;
1639
1640                 tzp = tz->tzp;
1641                 for (i = 0; i < tzp->num_tbps; i++) {
1642                         if (tzp->tbp[i].cdev == cdev) {
1643                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1644                                 tzp->tbp[i].cdev = NULL;
1645                         }
1646                 }
1647         }
1648
1649         mutex_unlock(&thermal_list_lock);
1650
1651         if (cdev->type[0])
1652                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1653         device_remove_file(&cdev->device, &dev_attr_max_state);
1654         device_remove_file(&cdev->device, &dev_attr_cur_state);
1655
1656         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1657         device_unregister(&cdev->device);
1658         return;
1659 }
1660 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1661
1662 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1663 {
1664         struct thermal_instance *instance;
1665         unsigned long target = 0;
1666
1667         /* cooling device is updated*/
1668         if (cdev->updated)
1669                 return;
1670
1671         mutex_lock(&cdev->lock);
1672         /* Make sure cdev enters the deepest cooling state */
1673         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1674                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1675                                 instance->tz->id, instance->target);
1676                 if (instance->target == THERMAL_NO_TARGET)
1677                         continue;
1678                 if (instance->target > target)
1679                         target = instance->target;
1680         }
1681         mutex_unlock(&cdev->lock);
1682         cdev->ops->set_cur_state(cdev, target);
1683         cdev->updated = true;
1684         trace_cdev_update(cdev, target);
1685         dev_dbg(&cdev->device, "set to state %lu\n", target);
1686 }
1687 EXPORT_SYMBOL(thermal_cdev_update);
1688
1689 /**
1690  * thermal_notify_framework - Sensor drivers use this API to notify framework
1691  * @tz:         thermal zone device
1692  * @trip:       indicates which trip point has been crossed
1693  *
1694  * This function handles the trip events from sensor drivers. It starts
1695  * throttling the cooling devices according to the policy configured.
1696  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1697  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1698  * The throttling policy is based on the configured platform data; if no
1699  * platform data is provided, this uses the step_wise throttling policy.
1700  */
1701 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1702 {
1703         handle_thermal_trip(tz, trip);
1704 }
1705 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1706
1707 /**
1708  * create_trip_attrs() - create attributes for trip points
1709  * @tz:         the thermal zone device
1710  * @mask:       Writeable trip point bitmap.
1711  *
1712  * helper function to instantiate sysfs entries for every trip
1713  * point and its properties of a struct thermal_zone_device.
1714  *
1715  * Return: 0 on success, the proper error value otherwise.
1716  */
1717 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1718 {
1719         int indx;
1720         int size = sizeof(struct thermal_attr) * tz->trips;
1721
1722         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1723         if (!tz->trip_type_attrs)
1724                 return -ENOMEM;
1725
1726         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1727         if (!tz->trip_temp_attrs) {
1728                 kfree(tz->trip_type_attrs);
1729                 return -ENOMEM;
1730         }
1731
1732         if (tz->ops->get_trip_hyst) {
1733                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1734                 if (!tz->trip_hyst_attrs) {
1735                         kfree(tz->trip_type_attrs);
1736                         kfree(tz->trip_temp_attrs);
1737                         return -ENOMEM;
1738                 }
1739         }
1740
1741
1742         for (indx = 0; indx < tz->trips; indx++) {
1743                 /* create trip type attribute */
1744                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1745                          "trip_point_%d_type", indx);
1746
1747                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1748                 tz->trip_type_attrs[indx].attr.attr.name =
1749                                                 tz->trip_type_attrs[indx].name;
1750                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1751                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1752
1753                 device_create_file(&tz->device,
1754                                    &tz->trip_type_attrs[indx].attr);
1755
1756                 /* create trip temp attribute */
1757                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1758                          "trip_point_%d_temp", indx);
1759
1760                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1761                 tz->trip_temp_attrs[indx].attr.attr.name =
1762                                                 tz->trip_temp_attrs[indx].name;
1763                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1764                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1765                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1766                     mask & (1 << indx)) {
1767                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1768                         tz->trip_temp_attrs[indx].attr.store =
1769                                                         trip_point_temp_store;
1770                 }
1771
1772                 device_create_file(&tz->device,
1773                                    &tz->trip_temp_attrs[indx].attr);
1774
1775                 /* create Optional trip hyst attribute */
1776                 if (!tz->ops->get_trip_hyst)
1777                         continue;
1778                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1779                          "trip_point_%d_hyst", indx);
1780
1781                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1782                 tz->trip_hyst_attrs[indx].attr.attr.name =
1783                                         tz->trip_hyst_attrs[indx].name;
1784                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1785                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1786                 if (tz->ops->set_trip_hyst) {
1787                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1788                         tz->trip_hyst_attrs[indx].attr.store =
1789                                         trip_point_hyst_store;
1790                 }
1791
1792                 device_create_file(&tz->device,
1793                                    &tz->trip_hyst_attrs[indx].attr);
1794         }
1795         return 0;
1796 }
1797
1798 static void remove_trip_attrs(struct thermal_zone_device *tz)
1799 {
1800         int indx;
1801
1802         for (indx = 0; indx < tz->trips; indx++) {
1803                 device_remove_file(&tz->device,
1804                                    &tz->trip_type_attrs[indx].attr);
1805                 device_remove_file(&tz->device,
1806                                    &tz->trip_temp_attrs[indx].attr);
1807                 if (tz->ops->get_trip_hyst)
1808                         device_remove_file(&tz->device,
1809                                   &tz->trip_hyst_attrs[indx].attr);
1810         }
1811         kfree(tz->trip_type_attrs);
1812         kfree(tz->trip_temp_attrs);
1813         kfree(tz->trip_hyst_attrs);
1814 }
1815
1816 /**
1817  * thermal_zone_device_register() - register a new thermal zone device
1818  * @type:       the thermal zone device type
1819  * @trips:      the number of trip points the thermal zone support
1820  * @mask:       a bit string indicating the writeablility of trip points
1821  * @devdata:    private device data
1822  * @ops:        standard thermal zone device callbacks
1823  * @tzp:        thermal zone platform parameters
1824  * @passive_delay: number of milliseconds to wait between polls when
1825  *                 performing passive cooling
1826  * @polling_delay: number of milliseconds to wait between polls when checking
1827  *                 whether trip points have been crossed (0 for interrupt
1828  *                 driven systems)
1829  *
1830  * This interface function adds a new thermal zone device (sensor) to
1831  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1832  * thermal cooling devices registered at the same time.
1833  * thermal_zone_device_unregister() must be called when the device is no
1834  * longer needed. The passive cooling depends on the .get_trend() return value.
1835  *
1836  * Return: a pointer to the created struct thermal_zone_device or an
1837  * in case of error, an ERR_PTR. Caller must check return value with
1838  * IS_ERR*() helpers.
1839  */
1840 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1841         int trips, int mask, void *devdata,
1842         struct thermal_zone_device_ops *ops,
1843         struct thermal_zone_params *tzp,
1844         int passive_delay, int polling_delay)
1845 {
1846         struct thermal_zone_device *tz;
1847         enum thermal_trip_type trip_type;
1848         int result;
1849         int count;
1850         int passive = 0;
1851         struct thermal_governor *governor;
1852
1853         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1854                 return ERR_PTR(-EINVAL);
1855
1856         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1857                 return ERR_PTR(-EINVAL);
1858
1859         if (!ops)
1860                 return ERR_PTR(-EINVAL);
1861
1862         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1863                 return ERR_PTR(-EINVAL);
1864
1865         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1866         if (!tz)
1867                 return ERR_PTR(-ENOMEM);
1868
1869         INIT_LIST_HEAD(&tz->thermal_instances);
1870         idr_init(&tz->idr);
1871         mutex_init(&tz->lock);
1872         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1873         if (result) {
1874                 kfree(tz);
1875                 return ERR_PTR(result);
1876         }
1877
1878         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1879         tz->ops = ops;
1880         tz->tzp = tzp;
1881         tz->device.class = &thermal_class;
1882         tz->devdata = devdata;
1883         tz->trips = trips;
1884         tz->passive_delay = passive_delay;
1885         tz->polling_delay = polling_delay;
1886         tz->prev_low_trip = INT_MAX;
1887         tz->prev_high_trip = -INT_MAX;
1888
1889         /* A new thermal zone needs to be updated anyway. */
1890         atomic_set(&tz->need_update, 1);
1891
1892         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1893         result = device_register(&tz->device);
1894         if (result) {
1895                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1896                 kfree(tz);
1897                 return ERR_PTR(result);
1898         }
1899
1900         /* sys I/F */
1901         if (type) {
1902                 result = device_create_file(&tz->device, &dev_attr_type);
1903                 if (result)
1904                         goto unregister;
1905         }
1906
1907         result = device_create_file(&tz->device, &dev_attr_temp);
1908         if (result)
1909                 goto unregister;
1910
1911         if (ops->get_mode) {
1912                 result = device_create_file(&tz->device, &dev_attr_mode);
1913                 if (result)
1914                         goto unregister;
1915         }
1916
1917         result = create_trip_attrs(tz, mask);
1918         if (result)
1919                 goto unregister;
1920
1921         for (count = 0; count < trips; count++) {
1922                 tz->ops->get_trip_type(tz, count, &trip_type);
1923                 if (trip_type == THERMAL_TRIP_PASSIVE)
1924                         passive = 1;
1925         }
1926
1927         if (!passive) {
1928                 result = device_create_file(&tz->device, &dev_attr_passive);
1929                 if (result)
1930                         goto unregister;
1931         }
1932
1933         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1934                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1935                 if (result)
1936                         goto unregister;
1937         }
1938
1939         /* Create policy attribute */
1940         result = device_create_file(&tz->device, &dev_attr_policy);
1941         if (result)
1942                 goto unregister;
1943
1944         /* Add thermal zone params */
1945         result = create_tzp_attrs(&tz->device);
1946         if (result)
1947                 goto unregister;
1948
1949         /* Create available_policies attribute */
1950         result = device_create_file(&tz->device, &dev_attr_available_policies);
1951         if (result)
1952                 goto unregister;
1953
1954         /* Update 'this' zone's governor information */
1955         mutex_lock(&thermal_governor_lock);
1956
1957         if (tz->tzp)
1958                 governor = __find_governor(tz->tzp->governor_name);
1959         else
1960                 governor = def_governor;
1961
1962         result = thermal_set_governor(tz, governor);
1963         if (result) {
1964                 mutex_unlock(&thermal_governor_lock);
1965                 goto unregister;
1966         }
1967
1968         mutex_unlock(&thermal_governor_lock);
1969
1970         if (!tz->tzp || !tz->tzp->no_hwmon) {
1971                 result = thermal_add_hwmon_sysfs(tz);
1972                 if (result)
1973                         goto unregister;
1974         }
1975
1976         mutex_lock(&thermal_list_lock);
1977         list_add_tail(&tz->node, &thermal_tz_list);
1978         mutex_unlock(&thermal_list_lock);
1979
1980         /* Bind cooling devices for this zone */
1981         bind_tz(tz);
1982
1983         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1984
1985         thermal_zone_device_reset(tz);
1986         /* Update the new thermal zone and mark it as already updated. */
1987         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1988                 thermal_zone_device_update(tz);
1989
1990         return tz;
1991
1992 unregister:
1993         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1994         device_unregister(&tz->device);
1995         return ERR_PTR(result);
1996 }
1997 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1998
1999 /**
2000  * thermal_device_unregister - removes the registered thermal zone device
2001  * @tz: the thermal zone device to remove
2002  */
2003 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
2004 {
2005         int i;
2006         const struct thermal_zone_params *tzp;
2007         struct thermal_cooling_device *cdev;
2008         struct thermal_zone_device *pos = NULL;
2009
2010         if (!tz)
2011                 return;
2012
2013         tzp = tz->tzp;
2014
2015         mutex_lock(&thermal_list_lock);
2016         list_for_each_entry(pos, &thermal_tz_list, node)
2017             if (pos == tz)
2018                 break;
2019         if (pos != tz) {
2020                 /* thermal zone device not found */
2021                 mutex_unlock(&thermal_list_lock);
2022                 return;
2023         }
2024         list_del(&tz->node);
2025
2026         /* Unbind all cdevs associated with 'this' thermal zone */
2027         list_for_each_entry(cdev, &thermal_cdev_list, node) {
2028                 if (tz->ops->unbind) {
2029                         tz->ops->unbind(tz, cdev);
2030                         continue;
2031                 }
2032
2033                 if (!tzp || !tzp->tbp)
2034                         break;
2035
2036                 for (i = 0; i < tzp->num_tbps; i++) {
2037                         if (tzp->tbp[i].cdev == cdev) {
2038                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
2039                                 tzp->tbp[i].cdev = NULL;
2040                         }
2041                 }
2042         }
2043
2044         mutex_unlock(&thermal_list_lock);
2045
2046         thermal_zone_device_set_polling(tz, 0);
2047
2048         if (tz->type[0])
2049                 device_remove_file(&tz->device, &dev_attr_type);
2050         device_remove_file(&tz->device, &dev_attr_temp);
2051         if (tz->ops->get_mode)
2052                 device_remove_file(&tz->device, &dev_attr_mode);
2053         device_remove_file(&tz->device, &dev_attr_policy);
2054         device_remove_file(&tz->device, &dev_attr_available_policies);
2055         remove_trip_attrs(tz);
2056         thermal_set_governor(tz, NULL);
2057
2058         thermal_remove_hwmon_sysfs(tz);
2059         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2060         idr_destroy(&tz->idr);
2061         mutex_destroy(&tz->lock);
2062         device_unregister(&tz->device);
2063         return;
2064 }
2065 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2066
2067 /**
2068  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2069  * @name: thermal zone name to fetch the temperature
2070  *
2071  * When only one zone is found with the passed name, returns a reference to it.
2072  *
2073  * Return: On success returns a reference to an unique thermal zone with
2074  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2075  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2076  */
2077 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2078 {
2079         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2080         unsigned int found = 0;
2081
2082         if (!name)
2083                 goto exit;
2084
2085         mutex_lock(&thermal_list_lock);
2086         list_for_each_entry(pos, &thermal_tz_list, node)
2087                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2088                         found++;
2089                         ref = pos;
2090                 }
2091         mutex_unlock(&thermal_list_lock);
2092
2093         /* nothing has been found, thus an error code for it */
2094         if (found == 0)
2095                 ref = ERR_PTR(-ENODEV);
2096         else if (found > 1)
2097         /* Success only when an unique zone is found */
2098                 ref = ERR_PTR(-EEXIST);
2099
2100 exit:
2101         return ref;
2102 }
2103 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2104
2105 #ifdef CONFIG_NET
2106 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2107         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2108 };
2109
2110 static struct genl_family thermal_event_genl_family = {
2111         .id = GENL_ID_GENERATE,
2112         .name = THERMAL_GENL_FAMILY_NAME,
2113         .version = THERMAL_GENL_VERSION,
2114         .maxattr = THERMAL_GENL_ATTR_MAX,
2115         .mcgrps = thermal_event_mcgrps,
2116         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2117 };
2118
2119 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2120                                         enum events event)
2121 {
2122         struct sk_buff *skb;
2123         struct nlattr *attr;
2124         struct thermal_genl_event *thermal_event;
2125         void *msg_header;
2126         int size;
2127         int result;
2128         static unsigned int thermal_event_seqnum;
2129
2130         if (!tz)
2131                 return -EINVAL;
2132
2133         /* allocate memory */
2134         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2135                nla_total_size(0);
2136
2137         skb = genlmsg_new(size, GFP_ATOMIC);
2138         if (!skb)
2139                 return -ENOMEM;
2140
2141         /* add the genetlink message header */
2142         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2143                                  &thermal_event_genl_family, 0,
2144                                  THERMAL_GENL_CMD_EVENT);
2145         if (!msg_header) {
2146                 nlmsg_free(skb);
2147                 return -ENOMEM;
2148         }
2149
2150         /* fill the data */
2151         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2152                            sizeof(struct thermal_genl_event));
2153
2154         if (!attr) {
2155                 nlmsg_free(skb);
2156                 return -EINVAL;
2157         }
2158
2159         thermal_event = nla_data(attr);
2160         if (!thermal_event) {
2161                 nlmsg_free(skb);
2162                 return -EINVAL;
2163         }
2164
2165         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2166
2167         thermal_event->orig = tz->id;
2168         thermal_event->event = event;
2169
2170         /* send multicast genetlink message */
2171         genlmsg_end(skb, msg_header);
2172
2173         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2174                                    0, GFP_ATOMIC);
2175         if (result)
2176                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2177
2178         return result;
2179 }
2180 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2181
2182 static int genetlink_init(void)
2183 {
2184         return genl_register_family(&thermal_event_genl_family);
2185 }
2186
2187 static void genetlink_exit(void)
2188 {
2189         genl_unregister_family(&thermal_event_genl_family);
2190 }
2191 #else /* !CONFIG_NET */
2192 static inline int genetlink_init(void) { return 0; }
2193 static inline void genetlink_exit(void) {}
2194 #endif /* !CONFIG_NET */
2195
2196 static int __init thermal_register_governors(void)
2197 {
2198         int result;
2199
2200         result = thermal_gov_step_wise_register();
2201         if (result)
2202                 return result;
2203
2204         result = thermal_gov_fair_share_register();
2205         if (result)
2206                 return result;
2207
2208         result = thermal_gov_bang_bang_register();
2209         if (result)
2210                 return result;
2211
2212         result = thermal_gov_user_space_register();
2213         if (result)
2214                 return result;
2215
2216         return thermal_gov_power_allocator_register();
2217 }
2218
2219 static void thermal_unregister_governors(void)
2220 {
2221         thermal_gov_step_wise_unregister();
2222         thermal_gov_fair_share_unregister();
2223         thermal_gov_bang_bang_unregister();
2224         thermal_gov_user_space_unregister();
2225         thermal_gov_power_allocator_unregister();
2226 }
2227
2228 static int thermal_pm_notify(struct notifier_block *nb,
2229                                 unsigned long mode, void *_unused)
2230 {
2231         struct thermal_zone_device *tz;
2232
2233         switch (mode) {
2234         case PM_HIBERNATION_PREPARE:
2235         case PM_RESTORE_PREPARE:
2236         case PM_SUSPEND_PREPARE:
2237                 atomic_set(&in_suspend, 1);
2238                 break;
2239         case PM_POST_HIBERNATION:
2240         case PM_POST_RESTORE:
2241         case PM_POST_SUSPEND:
2242                 atomic_set(&in_suspend, 0);
2243                 list_for_each_entry(tz, &thermal_tz_list, node) {
2244                         thermal_zone_device_reset(tz);
2245                         thermal_zone_device_update(tz);
2246                 }
2247                 break;
2248         default:
2249                 break;
2250         }
2251         return 0;
2252 }
2253
2254 static struct notifier_block thermal_pm_nb = {
2255         .notifier_call = thermal_pm_notify,
2256 };
2257
2258 static int __init thermal_init(void)
2259 {
2260         int result;
2261
2262         result = thermal_register_governors();
2263         if (result)
2264                 goto error;
2265
2266         result = class_register(&thermal_class);
2267         if (result)
2268                 goto unregister_governors;
2269
2270         result = genetlink_init();
2271         if (result)
2272                 goto unregister_class;
2273
2274         result = of_parse_thermal_zones();
2275         if (result)
2276                 goto exit_netlink;
2277
2278         result = register_pm_notifier(&thermal_pm_nb);
2279         if (result)
2280                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2281                         result);
2282
2283         return 0;
2284
2285 exit_netlink:
2286         genetlink_exit();
2287 unregister_class:
2288         class_unregister(&thermal_class);
2289 unregister_governors:
2290         thermal_unregister_governors();
2291 error:
2292         idr_destroy(&thermal_tz_idr);
2293         idr_destroy(&thermal_cdev_idr);
2294         mutex_destroy(&thermal_idr_lock);
2295         mutex_destroy(&thermal_list_lock);
2296         mutex_destroy(&thermal_governor_lock);
2297         return result;
2298 }
2299
2300 static void __exit thermal_exit(void)
2301 {
2302         unregister_pm_notifier(&thermal_pm_nb);
2303         of_thermal_destroy_zones();
2304         genetlink_exit();
2305         class_unregister(&thermal_class);
2306         thermal_unregister_governors();
2307         idr_destroy(&thermal_tz_idr);
2308         idr_destroy(&thermal_cdev_idr);
2309         mutex_destroy(&thermal_idr_lock);
2310         mutex_destroy(&thermal_list_lock);
2311         mutex_destroy(&thermal_governor_lock);
2312 }
2313
2314 fs_initcall(thermal_init);
2315 module_exit(thermal_exit);