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         /* Ignore disabled trip points */
 458         if (test_bit(trip, &tz->trips_disabled))
 459                 return;
 460
 461         tz->ops->get_trip_type(tz, trip, &type);
 462
 463         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 464                 handle_critical_trips(tz, trip, type);
 465         else
 466                 handle_non_critical_trips(tz, trip, type);
 467         /*
 468          * Alright, we handled this trip successfully.
 469          * So, start monitoring again.
 470          */
 471         monitor_thermal_zone(tz);
 472 }
 473
 474 /**
 475  * thermal_zone_get_temp() - returns the temperature of a thermal zone
 476  * @tz: a valid pointer to a struct thermal_zone_device
 477  * @temp: a valid pointer to where to store the resulting temperature.
 478  *
 479  * When a valid thermal zone reference is passed, it will fetch its
 480  * temperature and fill @temp.
 481  *
 482  * Return: On success returns 0, an error code otherwise
 483  */
 484 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 485 {
 486         int ret = -EINVAL;
 487         int count;
 488         int crit_temp = INT_MAX;
 489         enum thermal_trip_type type;
 490
 491         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 492                 goto exit;
 493
 494         mutex_lock(&tz->lock);
 495
 496         ret = tz->ops->get_temp(tz, temp);
 497
 498         if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 499                 for (count = 0; count < tz->trips; count++) {
 500                         ret = tz->ops->get_trip_type(tz, count, &type);
 501                         if (!ret && type == THERMAL_TRIP_CRITICAL) {
 502                                 ret = tz->ops->get_trip_temp(tz, count,
 503                                                 &crit_temp);
 504                                 break;
 505                         }
 506                 }
 507
 508                 /*
 509                  * Only allow emulating a temperature when the real temperature
 510                  * is below the critical temperature so that the emulation code
 511                  * cannot hide critical conditions.
 512                  */
 513                 if (!ret && *temp < crit_temp)
 514                         *temp = tz->emul_temperature;
 515         }
 516
 517         mutex_unlock(&tz->lock);
 518 exit:
 519         return ret;
 520 }
 521 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 522
 523 static void update_temperature(struct thermal_zone_device *tz)
 524 {
 525         int temp, ret;
 526
 527         ret = thermal_zone_get_temp(tz, &temp);
 528         if (ret) {
 529                 if (ret != -EAGAIN)
 530                         dev_warn(&tz->device,
 531                                  "failed to read out thermal zone (%d)\n",
 532                                  ret);
 533                 return;
 534         }
 535
 536         mutex_lock(&tz->lock);
 537         tz->last_temperature = tz->temperature;
 538         tz->temperature = temp;
 539         mutex_unlock(&tz->lock);
 540
 541         trace_thermal_temperature(tz);
 542         if (tz->last_temperature == THERMAL_TEMP_INVALID)
 543                 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
 544                         tz->temperature);
 545         else
 546                 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 547                         tz->last_temperature, tz->temperature);
 548 }
 549
 550 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 551 {
 552         struct thermal_instance *pos;
 553
 554         tz->temperature = THERMAL_TEMP_INVALID;
 555         tz->passive = 0;
 556         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 557                 pos->initialized = false;
 558 }
 559
 560 void thermal_zone_device_update(struct thermal_zone_device *tz)
 561 {
 562         int count;
 563
 564         if (atomic_read(&in_suspend))
 565                 return;
 566
 567         if (!tz->ops->get_temp)
 568                 return;
 569
 570         update_temperature(tz);
 571
 572         for (count = 0; count < tz->trips; count++)
 573                 handle_thermal_trip(tz, count);
 574 }
 575 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 576
 577 static void thermal_zone_device_check(struct work_struct *work)
 578 {
 579         struct thermal_zone_device *tz = container_of(work, struct
 580                                                       thermal_zone_device,
 581                                                       poll_queue.work);
 582         thermal_zone_device_update(tz);
 583 }
 584
 585 /* sys I/F for thermal zone */
 586
 587 #define to_thermal_zone(_dev) \
 588         container_of(_dev, struct thermal_zone_device, device)
 589
 590 static ssize_t
 591 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 592 {
 593         struct thermal_zone_device *tz = to_thermal_zone(dev);
 594
 595         return sprintf(buf, "%s\n", tz->type);
 596 }
 597
 598 static ssize_t
 599 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 600 {
 601         struct thermal_zone_device *tz = to_thermal_zone(dev);
 602         int temperature, ret;
 603
 604         ret = thermal_zone_get_temp(tz, &temperature);
 605
 606         if (ret)
 607                 return ret;
 608
 609         return sprintf(buf, "%d\n", temperature);
 610 }
 611
 612 static ssize_t
 613 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 614 {
 615         struct thermal_zone_device *tz = to_thermal_zone(dev);
 616         enum thermal_device_mode mode;
 617         int result;
 618
 619         if (!tz->ops->get_mode)
 620                 return -EPERM;
 621
 622         result = tz->ops->get_mode(tz, &mode);
 623         if (result)
 624                 return result;
 625
 626         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 627                        : "disabled");
 628 }
 629
 630 static ssize_t
 631 mode_store(struct device *dev, struct device_attribute *attr,
 632            const char *buf, size_t count)
 633 {
 634         struct thermal_zone_device *tz = to_thermal_zone(dev);
 635         int result;
 636
 637         if (!tz->ops->set_mode)
 638                 return -EPERM;
 639
 640         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 641                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 642         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 643                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 644         else
 645                 result = -EINVAL;
 646
 647         if (result)
 648                 return result;
 649
 650         return count;
 651 }
 652
 653 static ssize_t
 654 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 655                      char *buf)
 656 {
 657         struct thermal_zone_device *tz = to_thermal_zone(dev);
 658         enum thermal_trip_type type;
 659         int trip, result;
 660
 661         if (!tz->ops->get_trip_type)
 662                 return -EPERM;
 663
 664         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 665                 return -EINVAL;
 666
 667         result = tz->ops->get_trip_type(tz, trip, &type);
 668         if (result)
 669                 return result;
 670
 671         switch (type) {
 672         case THERMAL_TRIP_CRITICAL:
 673                 return sprintf(buf, "critical\n");
 674         case THERMAL_TRIP_HOT:
 675                 return sprintf(buf, "hot\n");
 676         case THERMAL_TRIP_PASSIVE:
 677                 return sprintf(buf, "passive\n");
 678         case THERMAL_TRIP_ACTIVE:
 679                 return sprintf(buf, "active\n");
 680         default:
 681                 return sprintf(buf, "unknown\n");
 682         }
 683 }
 684
 685 static ssize_t
 686 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 687                      const char *buf, size_t count)
 688 {
 689         struct thermal_zone_device *tz = to_thermal_zone(dev);
 690         int trip, ret;
 691         int temperature;
 692
 693         if (!tz->ops->set_trip_temp)
 694                 return -EPERM;
 695
 696         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 697                 return -EINVAL;
 698
 699         if (kstrtoint(buf, 10, &temperature))
 700                 return -EINVAL;
 701
 702         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 703         if (ret)
 704                 return ret;
 705
 706         thermal_zone_device_update(tz);
 707
 708         return count;
 709 }
 710
 711 static ssize_t
 712 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 713                      char *buf)
 714 {
 715         struct thermal_zone_device *tz = to_thermal_zone(dev);
 716         int trip, ret;
 717         int temperature;
 718
 719         if (!tz->ops->get_trip_temp)
 720                 return -EPERM;
 721
 722         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 723                 return -EINVAL;
 724
 725         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 726
 727         if (ret)
 728                 return ret;
 729
 730         return sprintf(buf, "%d\n", temperature);
 731 }
 732
 733 static ssize_t
 734 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 735                         const char *buf, size_t count)
 736 {
 737         struct thermal_zone_device *tz = to_thermal_zone(dev);
 738         int trip, ret;
 739         int temperature;
 740
 741         if (!tz->ops->set_trip_hyst)
 742                 return -EPERM;
 743
 744         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 745                 return -EINVAL;
 746
 747         if (kstrtoint(buf, 10, &temperature))
 748                 return -EINVAL;
 749
 750         /*
 751          * We are not doing any check on the 'temperature' value
 752          * here. The driver implementing 'set_trip_hyst' has to
 753          * take care of this.
 754          */
 755         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 756
 757         return ret ? ret : count;
 758 }
 759
 760 static ssize_t
 761 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 762                         char *buf)
 763 {
 764         struct thermal_zone_device *tz = to_thermal_zone(dev);
 765         int trip, ret;
 766         int temperature;
 767
 768         if (!tz->ops->get_trip_hyst)
 769                 return -EPERM;
 770
 771         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 772                 return -EINVAL;
 773
 774         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 775
 776         return ret ? ret : sprintf(buf, "%d\n", temperature);
 777 }
 778
 779 static ssize_t
 780 passive_store(struct device *dev, struct device_attribute *attr,
 781                     const char *buf, size_t count)
 782 {
 783         struct thermal_zone_device *tz = to_thermal_zone(dev);
 784         struct thermal_cooling_device *cdev = NULL;
 785         int state;
 786
 787         if (!sscanf(buf, "%d\n", &state))
 788                 return -EINVAL;
 789
 790         /* sanity check: values below 1000 millicelcius don't make sense
 791          * and can cause the system to go into a thermal heart attack
 792          */
 793         if (state && state < 1000)
 794                 return -EINVAL;
 795
 796         if (state && !tz->forced_passive) {
 797                 mutex_lock(&thermal_list_lock);
 798                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 799                         if (!strncmp("Processor", cdev->type,
 800                                      sizeof("Processor")))
 801                                 thermal_zone_bind_cooling_device(tz,
 802                                                 THERMAL_TRIPS_NONE, cdev,
 803                                                 THERMAL_NO_LIMIT,
 804                                                 THERMAL_NO_LIMIT,
 805                                                 THERMAL_WEIGHT_DEFAULT);
 806                 }
 807                 mutex_unlock(&thermal_list_lock);
 808                 if (!tz->passive_delay)
 809                         tz->passive_delay = 1000;
 810         } else if (!state && tz->forced_passive) {
 811                 mutex_lock(&thermal_list_lock);
 812                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 813                         if (!strncmp("Processor", cdev->type,
 814                                      sizeof("Processor")))
 815                                 thermal_zone_unbind_cooling_device(tz,
 816                                                                    THERMAL_TRIPS_NONE,
 817                                                                    cdev);
 818                 }
 819                 mutex_unlock(&thermal_list_lock);
 820                 tz->passive_delay = 0;
 821         }
 822
 823         tz->forced_passive = state;
 824
 825         thermal_zone_device_update(tz);
 826
 827         return count;
 828 }
 829
 830 static ssize_t
 831 passive_show(struct device *dev, struct device_attribute *attr,
 832                    char *buf)
 833 {
 834         struct thermal_zone_device *tz = to_thermal_zone(dev);
 835
 836         return sprintf(buf, "%d\n", tz->forced_passive);
 837 }
 838
 839 static ssize_t
 840 policy_store(struct device *dev, struct device_attribute *attr,
 841                     const char *buf, size_t count)
 842 {
 843         int ret = -EINVAL;
 844         struct thermal_zone_device *tz = to_thermal_zone(dev);
 845         struct thermal_governor *gov;
 846         char name[THERMAL_NAME_LENGTH];
 847
 848         snprintf(name, sizeof(name), "%s", buf);
 849
 850         mutex_lock(&thermal_governor_lock);
 851         mutex_lock(&tz->lock);
 852
 853         gov = __find_governor(strim(name));
 854         if (!gov)
 855                 goto exit;
 856
 857         ret = thermal_set_governor(tz, gov);
 858         if (!ret)
 859                 ret = count;
 860
 861 exit:
 862         mutex_unlock(&tz->lock);
 863         mutex_unlock(&thermal_governor_lock);
 864         return ret;
 865 }
 866
 867 static ssize_t
 868 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 869 {
 870         struct thermal_zone_device *tz = to_thermal_zone(dev);
 871
 872         return sprintf(buf, "%s\n", tz->governor->name);
 873 }
 874
 875 static ssize_t
 876 available_policies_show(struct device *dev, struct device_attribute *devattr,
 877                         char *buf)
 878 {
 879         struct thermal_governor *pos;
 880         ssize_t count = 0;
 881         ssize_t size = PAGE_SIZE;
 882
 883         mutex_lock(&thermal_governor_lock);
 884
 885         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 886                 size = PAGE_SIZE - count;
 887                 count += scnprintf(buf + count, size, "%s ", pos->name);
 888         }
 889         count += scnprintf(buf + count, size, "\n");
 890
 891         mutex_unlock(&thermal_governor_lock);
 892
 893         return count;
 894 }
 895
 896 static ssize_t
 897 emul_temp_store(struct device *dev, struct device_attribute *attr,
 898                      const char *buf, size_t count)
 899 {
 900         struct thermal_zone_device *tz = to_thermal_zone(dev);
 901         int ret = 0;
 902         int temperature;
 903
 904         if (kstrtoint(buf, 10, &temperature))
 905                 return -EINVAL;
 906
 907         if (!tz->ops->set_emul_temp) {
 908                 mutex_lock(&tz->lock);
 909                 tz->emul_temperature = temperature;
 910                 mutex_unlock(&tz->lock);
 911         } else {
 912                 ret = tz->ops->set_emul_temp(tz, temperature);
 913         }
 914
 915         if (!ret)
 916                 thermal_zone_device_update(tz);
 917
 918         return ret ? ret : count;
 919 }
 920 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 921
 922 static ssize_t
 923 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 924                        char *buf)
 925 {
 926         struct thermal_zone_device *tz = to_thermal_zone(dev);
 927
 928         if (tz->tzp)
 929                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 930         else
 931                 return -EIO;
 932 }
 933
 934 static ssize_t
 935 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 936                         const char *buf, size_t count)
 937 {
 938         struct thermal_zone_device *tz = to_thermal_zone(dev);
 939         u32 sustainable_power;
 940
 941         if (!tz->tzp)
 942                 return -EIO;
 943
 944         if (kstrtou32(buf, 10, &sustainable_power))
 945                 return -EINVAL;
 946
 947         tz->tzp->sustainable_power = sustainable_power;
 948
 949         return count;
 950 }
 951 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 952                 sustainable_power_store);
 953
 954 #define create_s32_tzp_attr(name)                                       \
 955         static ssize_t                                                  \
 956         name##_show(struct device *dev, struct device_attribute *devattr, \
 957                 char *buf)                                              \
 958         {                                                               \
 959         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
 960                                                                         \
 961         if (tz->tzp)                                                    \
 962                 return sprintf(buf, "%d\n", tz->tzp->name);             \
 963         else                                                            \
 964                 return -EIO;                                            \
 965         }                                                               \
 966                                                                         \
 967         static ssize_t                                                  \
 968         name##_store(struct device *dev, struct device_attribute *devattr, \
 969                 const char *buf, size_t count)                          \
 970         {                                                               \
 971                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
 972                 s32 value;                                              \
 973                                                                         \
 974                 if (!tz->tzp)                                           \
 975                         return -EIO;                                    \
 976                                                                         \
 977                 if (kstrtos32(buf, 10, &value))                         \
 978                         return -EINVAL;                                 \
 979                                                                         \
 980                 tz->tzp->name = value;                                  \
 981                                                                         \
 982                 return count;                                           \
 983         }                                                               \
 984         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
 985
 986 create_s32_tzp_attr(k_po);
 987 create_s32_tzp_attr(k_pu);
 988 create_s32_tzp_attr(k_i);
 989 create_s32_tzp_attr(k_d);
 990 create_s32_tzp_attr(integral_cutoff);
 991 create_s32_tzp_attr(slope);
 992 create_s32_tzp_attr(offset);
 993 #undef create_s32_tzp_attr
 994
 995 static struct device_attribute *dev_tzp_attrs[] = {
 996         &dev_attr_sustainable_power,
 997         &dev_attr_k_po,
 998         &dev_attr_k_pu,
 999         &dev_attr_k_i,
1000         &dev_attr_k_d,
1001         &dev_attr_integral_cutoff,
1002         &dev_attr_slope,
1003         &dev_attr_offset,
1004 };
1005
1006 static int create_tzp_attrs(struct device *dev)
1007 {
1008         int i;
1009
1010         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1011                 int ret;
1012                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1013
1014                 ret = device_create_file(dev, dev_attr);
1015                 if (ret)
1016                         return ret;
1017         }
1018
1019         return 0;
1020 }
1021
1022 /**
1023  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1024  * @cdev:       pointer to &thermal_cooling_device
1025  * @tz:         a valid thermal zone device pointer
1026  * @max_power:  pointer in which to store the maximum power
1027  *
1028  * Calculate the maximum power consumption in milliwats that the
1029  * cooling device can currently consume and store it in @max_power.
1030  *
1031  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1032  * power_actor API or -E* on other error.
1033  */
1034 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1035                               struct thermal_zone_device *tz, u32 *max_power)
1036 {
1037         if (!cdev_is_power_actor(cdev))
1038                 return -EINVAL;
1039
1040         return cdev->ops->state2power(cdev, tz, 0, max_power);
1041 }
1042
1043 /**
1044  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1045  * @cdev:       pointer to &thermal_cooling_device
1046  * @tz:         a valid thermal zone device pointer
1047  * @min_power:  pointer in which to store the minimum power
1048  *
1049  * Calculate the minimum power consumption in milliwatts that the
1050  * cooling device can currently consume and store it in @min_power.
1051  *
1052  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1053  * power_actor API or -E* on other error.
1054  */
1055 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1056                               struct thermal_zone_device *tz, u32 *min_power)
1057 {
1058         unsigned long max_state;
1059         int ret;
1060
1061         if (!cdev_is_power_actor(cdev))
1062                 return -EINVAL;
1063
1064         ret = cdev->ops->get_max_state(cdev, &max_state);
1065         if (ret)
1066                 return ret;
1067
1068         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1069 }
1070
1071 /**
1072  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1073  * @cdev:       pointer to &thermal_cooling_device
1074  * @instance:   thermal instance to update
1075  * @power:      the power in milliwatts
1076  *
1077  * Set the cooling device to consume at most @power milliwatts.
1078  *
1079  * Return: 0 on success, -EINVAL if the cooling device does not
1080  * implement the power actor API or -E* for other failures.
1081  */
1082 int power_actor_set_power(struct thermal_cooling_device *cdev,
1083                           struct thermal_instance *instance, u32 power)
1084 {
1085         unsigned long state;
1086         int ret;
1087
1088         if (!cdev_is_power_actor(cdev))
1089                 return -EINVAL;
1090
1091         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1092         if (ret)
1093                 return ret;
1094
1095         instance->target = state;
1096         cdev->updated = false;
1097         thermal_cdev_update(cdev);
1098
1099         return 0;
1100 }
1101
1102 static DEVICE_ATTR(type, 0444, type_show, NULL);
1103 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1104 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1105 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1106 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1107 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1108
1109 /* sys I/F for cooling device */
1110 #define to_cooling_device(_dev) \
1111         container_of(_dev, struct thermal_cooling_device, device)
1112
1113 static ssize_t
1114 thermal_cooling_device_type_show(struct device *dev,
1115                                  struct device_attribute *attr, char *buf)
1116 {
1117         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1118
1119         return sprintf(buf, "%s\n", cdev->type);
1120 }
1121
1122 static ssize_t
1123 thermal_cooling_device_max_state_show(struct device *dev,
1124                                       struct device_attribute *attr, char *buf)
1125 {
1126         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1127         unsigned long state;
1128         int ret;
1129
1130         ret = cdev->ops->get_max_state(cdev, &state);
1131         if (ret)
1132                 return ret;
1133         return sprintf(buf, "%ld\n", state);
1134 }
1135
1136 static ssize_t
1137 thermal_cooling_device_cur_state_show(struct device *dev,
1138                                       struct device_attribute *attr, char *buf)
1139 {
1140         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1141         unsigned long state;
1142         int ret;
1143
1144         ret = cdev->ops->get_cur_state(cdev, &state);
1145         if (ret)
1146                 return ret;
1147         return sprintf(buf, "%ld\n", state);
1148 }
1149
1150 static ssize_t
1151 thermal_cooling_device_cur_state_store(struct device *dev,
1152                                        struct device_attribute *attr,
1153                                        const char *buf, size_t count)
1154 {
1155         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1156         unsigned long state;
1157         int result;
1158
1159         if (!sscanf(buf, "%ld\n", &state))
1160                 return -EINVAL;
1161
1162         if ((long)state < 0)
1163                 return -EINVAL;
1164
1165         result = cdev->ops->set_cur_state(cdev, state);
1166         if (result)
1167                 return result;
1168         return count;
1169 }
1170
1171 static struct device_attribute dev_attr_cdev_type =
1172 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1173 static DEVICE_ATTR(max_state, 0444,
1174                    thermal_cooling_device_max_state_show, NULL);
1175 static DEVICE_ATTR(cur_state, 0644,
1176                    thermal_cooling_device_cur_state_show,
1177                    thermal_cooling_device_cur_state_store);
1178
1179 static ssize_t
1180 thermal_cooling_device_trip_point_show(struct device *dev,
1181                                        struct device_attribute *attr, char *buf)
1182 {
1183         struct thermal_instance *instance;
1184
1185         instance =
1186             container_of(attr, struct thermal_instance, attr);
1187
1188         if (instance->trip == THERMAL_TRIPS_NONE)
1189                 return sprintf(buf, "-1\n");
1190         else
1191                 return sprintf(buf, "%d\n", instance->trip);
1192 }
1193
1194 static struct attribute *cooling_device_attrs[] = {
1195         &dev_attr_cdev_type.attr,
1196         &dev_attr_max_state.attr,
1197         &dev_attr_cur_state.attr,
1198         NULL,
1199 };
1200
1201 static const struct attribute_group cooling_device_attr_group = {
1202         .attrs = cooling_device_attrs,
1203 };
1204
1205 static const struct attribute_group *cooling_device_attr_groups[] = {
1206         &cooling_device_attr_group,
1207         NULL,
1208 };
1209
1210 static ssize_t
1211 thermal_cooling_device_weight_show(struct device *dev,
1212                                    struct device_attribute *attr, char *buf)
1213 {
1214         struct thermal_instance *instance;
1215
1216         instance = container_of(attr, struct thermal_instance, weight_attr);
1217
1218         return sprintf(buf, "%d\n", instance->weight);
1219 }
1220
1221 static ssize_t
1222 thermal_cooling_device_weight_store(struct device *dev,
1223                                     struct device_attribute *attr,
1224                                     const char *buf, size_t count)
1225 {
1226         struct thermal_instance *instance;
1227         int ret, weight;
1228
1229         ret = kstrtoint(buf, 0, &weight);
1230         if (ret)
1231                 return ret;
1232
1233         instance = container_of(attr, struct thermal_instance, weight_attr);
1234         instance->weight = weight;
1235
1236         return count;
1237 }
1238 /* Device management */
1239
1240 /**
1241  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1242  * @tz:         pointer to struct thermal_zone_device
1243  * @trip:       indicates which trip point the cooling devices is
1244  *              associated with in this thermal zone.
1245  * @cdev:       pointer to struct thermal_cooling_device
1246  * @upper:      the Maximum cooling state for this trip point.
1247  *              THERMAL_NO_LIMIT means no upper limit,
1248  *              and the cooling device can be in max_state.
1249  * @lower:      the Minimum cooling state can be used for this trip point.
1250  *              THERMAL_NO_LIMIT means no lower limit,
1251  *              and the cooling device can be in cooling state 0.
1252  * @weight:     The weight of the cooling device to be bound to the
1253  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1254  *              default value
1255  *
1256  * This interface function bind a thermal cooling device to the certain trip
1257  * point of a thermal zone device.
1258  * This function is usually called in the thermal zone device .bind callback.
1259  *
1260  * Return: 0 on success, the proper error value otherwise.
1261  */
1262 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1263                                      int trip,
1264                                      struct thermal_cooling_device *cdev,
1265                                      unsigned long upper, unsigned long lower,
1266                                      unsigned int weight)
1267 {
1268         struct thermal_instance *dev;
1269         struct thermal_instance *pos;
1270         struct thermal_zone_device *pos1;
1271         struct thermal_cooling_device *pos2;
1272         unsigned long max_state;
1273         int result, ret;
1274
1275         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1276                 return -EINVAL;
1277
1278         list_for_each_entry(pos1, &thermal_tz_list, node) {
1279                 if (pos1 == tz)
1280                         break;
1281         }
1282         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1283                 if (pos2 == cdev)
1284                         break;
1285         }
1286
1287         if (tz != pos1 || cdev != pos2)
1288                 return -EINVAL;
1289
1290         ret = cdev->ops->get_max_state(cdev, &max_state);
1291         if (ret)
1292                 return ret;
1293
1294         /* lower default 0, upper default max_state */
1295         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1296         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1297
1298         if (lower > upper || upper > max_state)
1299                 return -EINVAL;
1300
1301         dev =
1302             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1303         if (!dev)
1304                 return -ENOMEM;
1305         dev->tz = tz;
1306         dev->cdev = cdev;
1307         dev->trip = trip;
1308         dev->upper = upper;
1309         dev->lower = lower;
1310         dev->target = THERMAL_NO_TARGET;
1311         dev->weight = weight;
1312
1313         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1314         if (result)
1315                 goto free_mem;
1316
1317         sprintf(dev->name, "cdev%d", dev->id);
1318         result =
1319             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1320         if (result)
1321                 goto release_idr;
1322
1323         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1324         sysfs_attr_init(&dev->attr.attr);
1325         dev->attr.attr.name = dev->attr_name;
1326         dev->attr.attr.mode = 0444;
1327         dev->attr.show = thermal_cooling_device_trip_point_show;
1328         result = device_create_file(&tz->device, &dev->attr);
1329         if (result)
1330                 goto remove_symbol_link;
1331
1332         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1333         sysfs_attr_init(&dev->weight_attr.attr);
1334         dev->weight_attr.attr.name = dev->weight_attr_name;
1335         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1336         dev->weight_attr.show = thermal_cooling_device_weight_show;
1337         dev->weight_attr.store = thermal_cooling_device_weight_store;
1338         result = device_create_file(&tz->device, &dev->weight_attr);
1339         if (result)
1340                 goto remove_trip_file;
1341
1342         mutex_lock(&tz->lock);
1343         mutex_lock(&cdev->lock);
1344         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1345             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1346                 result = -EEXIST;
1347                 break;
1348         }
1349         if (!result) {
1350                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1351                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1352                 atomic_set(&tz->need_update, 1);
1353         }
1354         mutex_unlock(&cdev->lock);
1355         mutex_unlock(&tz->lock);
1356
1357         if (!result)
1358                 return 0;
1359
1360         device_remove_file(&tz->device, &dev->weight_attr);
1361 remove_trip_file:
1362         device_remove_file(&tz->device, &dev->attr);
1363 remove_symbol_link:
1364         sysfs_remove_link(&tz->device.kobj, dev->name);
1365 release_idr:
1366         release_idr(&tz->idr, &tz->lock, dev->id);
1367 free_mem:
1368         kfree(dev);
1369         return result;
1370 }
1371 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1372
1373 /**
1374  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1375  *                                        thermal zone.
1376  * @tz:         pointer to a struct thermal_zone_device.
1377  * @trip:       indicates which trip point the cooling devices is
1378  *              associated with in this thermal zone.
1379  * @cdev:       pointer to a struct thermal_cooling_device.
1380  *
1381  * This interface function unbind a thermal cooling device from the certain
1382  * trip point of a thermal zone device.
1383  * This function is usually called in the thermal zone device .unbind callback.
1384  *
1385  * Return: 0 on success, the proper error value otherwise.
1386  */
1387 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1388                                        int trip,
1389                                        struct thermal_cooling_device *cdev)
1390 {
1391         struct thermal_instance *pos, *next;
1392
1393         mutex_lock(&tz->lock);
1394         mutex_lock(&cdev->lock);
1395         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1396                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1397                         list_del(&pos->tz_node);
1398                         list_del(&pos->cdev_node);
1399                         mutex_unlock(&cdev->lock);
1400                         mutex_unlock(&tz->lock);
1401                         goto unbind;
1402                 }
1403         }
1404         mutex_unlock(&cdev->lock);
1405         mutex_unlock(&tz->lock);
1406
1407         return -ENODEV;
1408
1409 unbind:
1410         device_remove_file(&tz->device, &pos->weight_attr);
1411         device_remove_file(&tz->device, &pos->attr);
1412         sysfs_remove_link(&tz->device.kobj, pos->name);
1413         release_idr(&tz->idr, &tz->lock, pos->id);
1414         kfree(pos);
1415         return 0;
1416 }
1417 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1418
1419 static void thermal_release(struct device *dev)
1420 {
1421         struct thermal_zone_device *tz;
1422         struct thermal_cooling_device *cdev;
1423
1424         if (!strncmp(dev_name(dev), "thermal_zone",
1425                      sizeof("thermal_zone") - 1)) {
1426                 tz = to_thermal_zone(dev);
1427                 kfree(tz);
1428         } else if(!strncmp(dev_name(dev), "cooling_device",
1429                         sizeof("cooling_device") - 1)){
1430                 cdev = to_cooling_device(dev);
1431                 kfree(cdev);
1432         }
1433 }
1434
1435 static struct class thermal_class = {
1436         .name = "thermal",
1437         .dev_release = thermal_release,
1438 };
1439
1440 /**
1441  * __thermal_cooling_device_register() - register a new thermal cooling device
1442  * @np:         a pointer to a device tree node.
1443  * @type:       the thermal cooling device type.
1444  * @devdata:    device private data.
1445  * @ops:                standard thermal cooling devices callbacks.
1446  *
1447  * This interface function adds a new thermal cooling device (fan/processor/...)
1448  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1449  * to all the thermal zone devices registered at the same time.
1450  * It also gives the opportunity to link the cooling device to a device tree
1451  * node, so that it can be bound to a thermal zone created out of device tree.
1452  *
1453  * Return: a pointer to the created struct thermal_cooling_device or an
1454  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1455  */
1456 static struct thermal_cooling_device *
1457 __thermal_cooling_device_register(struct device_node *np,
1458                                   char *type, void *devdata,
1459                                   const struct thermal_cooling_device_ops *ops)
1460 {
1461         struct thermal_cooling_device *cdev;
1462         struct thermal_zone_device *pos = NULL;
1463         int result;
1464
1465         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1466                 return ERR_PTR(-EINVAL);
1467
1468         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1469             !ops->set_cur_state)
1470                 return ERR_PTR(-EINVAL);
1471
1472         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1473         if (!cdev)
1474                 return ERR_PTR(-ENOMEM);
1475
1476         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1477         if (result) {
1478                 kfree(cdev);
1479                 return ERR_PTR(result);
1480         }
1481
1482         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1483         mutex_init(&cdev->lock);
1484         INIT_LIST_HEAD(&cdev->thermal_instances);
1485         cdev->np = np;
1486         cdev->ops = ops;
1487         cdev->updated = false;
1488         cdev->device.class = &thermal_class;
1489         cdev->device.groups = cooling_device_attr_groups;
1490         cdev->devdata = devdata;
1491         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1492         result = device_register(&cdev->device);
1493         if (result) {
1494                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1495                 kfree(cdev);
1496                 return ERR_PTR(result);
1497         }
1498
1499         /* Add 'this' new cdev to the global cdev list */
1500         mutex_lock(&thermal_list_lock);
1501         list_add(&cdev->node, &thermal_cdev_list);
1502         mutex_unlock(&thermal_list_lock);
1503
1504         /* Update binding information for 'this' new cdev */
1505         bind_cdev(cdev);
1506
1507         mutex_lock(&thermal_list_lock);
1508         list_for_each_entry(pos, &thermal_tz_list, node)
1509                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1510                         thermal_zone_device_update(pos);
1511         mutex_unlock(&thermal_list_lock);
1512
1513         return cdev;
1514 }
1515
1516 /**
1517  * thermal_cooling_device_register() - register a new thermal cooling device
1518  * @type:       the thermal cooling device type.
1519  * @devdata:    device private data.
1520  * @ops:                standard thermal cooling devices callbacks.
1521  *
1522  * This interface function adds a new thermal cooling device (fan/processor/...)
1523  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1524  * to all the thermal zone devices registered at the same time.
1525  *
1526  * Return: a pointer to the created struct thermal_cooling_device or an
1527  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1528  */
1529 struct thermal_cooling_device *
1530 thermal_cooling_device_register(char *type, void *devdata,
1531                                 const struct thermal_cooling_device_ops *ops)
1532 {
1533         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1534 }
1535 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1536
1537 /**
1538  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1539  * @np:         a pointer to a device tree node.
1540  * @type:       the thermal cooling device type.
1541  * @devdata:    device private data.
1542  * @ops:                standard thermal cooling devices callbacks.
1543  *
1544  * This function will register a cooling device with device tree node reference.
1545  * This interface function adds a new thermal cooling device (fan/processor/...)
1546  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1547  * to all the thermal zone devices registered at the same time.
1548  *
1549  * Return: a pointer to the created struct thermal_cooling_device or an
1550  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1551  */
1552 struct thermal_cooling_device *
1553 thermal_of_cooling_device_register(struct device_node *np,
1554                                    char *type, void *devdata,
1555                                    const struct thermal_cooling_device_ops *ops)
1556 {
1557         return __thermal_cooling_device_register(np, type, devdata, ops);
1558 }
1559 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1560
1561 /**
1562  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1563  * @cdev:       the thermal cooling device to remove.
1564  *
1565  * thermal_cooling_device_unregister() must be called when the device is no
1566  * longer needed.
1567  */
1568 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1569 {
1570         int i;
1571         const struct thermal_zone_params *tzp;
1572         struct thermal_zone_device *tz;
1573         struct thermal_cooling_device *pos = NULL;
1574
1575         if (!cdev)
1576                 return;
1577
1578         mutex_lock(&thermal_list_lock);
1579         list_for_each_entry(pos, &thermal_cdev_list, node)
1580             if (pos == cdev)
1581                 break;
1582         if (pos != cdev) {
1583                 /* thermal cooling device not found */
1584                 mutex_unlock(&thermal_list_lock);
1585                 return;
1586         }
1587         list_del(&cdev->node);
1588
1589         /* Unbind all thermal zones associated with 'this' cdev */
1590         list_for_each_entry(tz, &thermal_tz_list, node) {
1591                 if (tz->ops->unbind) {
1592                         tz->ops->unbind(tz, cdev);
1593                         continue;
1594                 }
1595
1596                 if (!tz->tzp || !tz->tzp->tbp)
1597                         continue;
1598
1599                 tzp = tz->tzp;
1600                 for (i = 0; i < tzp->num_tbps; i++) {
1601                         if (tzp->tbp[i].cdev == cdev) {
1602                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1603                                 tzp->tbp[i].cdev = NULL;
1604                         }
1605                 }
1606         }
1607
1608         mutex_unlock(&thermal_list_lock);
1609
1610         if (cdev->type[0])
1611                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1612         device_remove_file(&cdev->device, &dev_attr_max_state);
1613         device_remove_file(&cdev->device, &dev_attr_cur_state);
1614
1615         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1616         device_unregister(&cdev->device);
1617         return;
1618 }
1619 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1620
1621 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1622 {
1623         struct thermal_instance *instance;
1624         unsigned long target = 0;
1625
1626         /* cooling device is updated*/
1627         if (cdev->updated)
1628                 return;
1629
1630         mutex_lock(&cdev->lock);
1631         /* Make sure cdev enters the deepest cooling state */
1632         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1633                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1634                                 instance->tz->id, instance->target);
1635                 if (instance->target == THERMAL_NO_TARGET)
1636                         continue;
1637                 if (instance->target > target)
1638                         target = instance->target;
1639         }
1640         mutex_unlock(&cdev->lock);
1641         cdev->ops->set_cur_state(cdev, target);
1642         cdev->updated = true;
1643         trace_cdev_update(cdev, target);
1644         dev_dbg(&cdev->device, "set to state %lu\n", target);
1645 }
1646 EXPORT_SYMBOL(thermal_cdev_update);
1647
1648 /**
1649  * thermal_notify_framework - Sensor drivers use this API to notify framework
1650  * @tz:         thermal zone device
1651  * @trip:       indicates which trip point has been crossed
1652  *
1653  * This function handles the trip events from sensor drivers. It starts
1654  * throttling the cooling devices according to the policy configured.
1655  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1656  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1657  * The throttling policy is based on the configured platform data; if no
1658  * platform data is provided, this uses the step_wise throttling policy.
1659  */
1660 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1661 {
1662         handle_thermal_trip(tz, trip);
1663 }
1664 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1665
1666 /**
1667  * create_trip_attrs() - create attributes for trip points
1668  * @tz:         the thermal zone device
1669  * @mask:       Writeable trip point bitmap.
1670  *
1671  * helper function to instantiate sysfs entries for every trip
1672  * point and its properties of a struct thermal_zone_device.
1673  *
1674  * Return: 0 on success, the proper error value otherwise.
1675  */
1676 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1677 {
1678         int indx;
1679         int size = sizeof(struct thermal_attr) * tz->trips;
1680
1681         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1682         if (!tz->trip_type_attrs)
1683                 return -ENOMEM;
1684
1685         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1686         if (!tz->trip_temp_attrs) {
1687                 kfree(tz->trip_type_attrs);
1688                 return -ENOMEM;
1689         }
1690
1691         if (tz->ops->get_trip_hyst) {
1692                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1693                 if (!tz->trip_hyst_attrs) {
1694                         kfree(tz->trip_type_attrs);
1695                         kfree(tz->trip_temp_attrs);
1696                         return -ENOMEM;
1697                 }
1698         }
1699
1700
1701         for (indx = 0; indx < tz->trips; indx++) {
1702                 /* create trip type attribute */
1703                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1704                          "trip_point_%d_type", indx);
1705
1706                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1707                 tz->trip_type_attrs[indx].attr.attr.name =
1708                                                 tz->trip_type_attrs[indx].name;
1709                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1710                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1711
1712                 device_create_file(&tz->device,
1713                                    &tz->trip_type_attrs[indx].attr);
1714
1715                 /* create trip temp attribute */
1716                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1717                          "trip_point_%d_temp", indx);
1718
1719                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1720                 tz->trip_temp_attrs[indx].attr.attr.name =
1721                                                 tz->trip_temp_attrs[indx].name;
1722                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1723                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1724                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1725                     mask & (1 << indx)) {
1726                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1727                         tz->trip_temp_attrs[indx].attr.store =
1728                                                         trip_point_temp_store;
1729                 }
1730
1731                 device_create_file(&tz->device,
1732                                    &tz->trip_temp_attrs[indx].attr);
1733
1734                 /* create Optional trip hyst attribute */
1735                 if (!tz->ops->get_trip_hyst)
1736                         continue;
1737                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1738                          "trip_point_%d_hyst", indx);
1739
1740                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1741                 tz->trip_hyst_attrs[indx].attr.attr.name =
1742                                         tz->trip_hyst_attrs[indx].name;
1743                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1744                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1745                 if (tz->ops->set_trip_hyst) {
1746                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1747                         tz->trip_hyst_attrs[indx].attr.store =
1748                                         trip_point_hyst_store;
1749                 }
1750
1751                 device_create_file(&tz->device,
1752                                    &tz->trip_hyst_attrs[indx].attr);
1753         }
1754         return 0;
1755 }
1756
1757 static void remove_trip_attrs(struct thermal_zone_device *tz)
1758 {
1759         int indx;
1760
1761         for (indx = 0; indx < tz->trips; indx++) {
1762                 device_remove_file(&tz->device,
1763                                    &tz->trip_type_attrs[indx].attr);
1764                 device_remove_file(&tz->device,
1765                                    &tz->trip_temp_attrs[indx].attr);
1766                 if (tz->ops->get_trip_hyst)
1767                         device_remove_file(&tz->device,
1768                                   &tz->trip_hyst_attrs[indx].attr);
1769         }
1770         kfree(tz->trip_type_attrs);
1771         kfree(tz->trip_temp_attrs);
1772         kfree(tz->trip_hyst_attrs);
1773 }
1774
1775 /**
1776  * thermal_zone_device_register() - register a new thermal zone device
1777  * @type:       the thermal zone device type
1778  * @trips:      the number of trip points the thermal zone support
1779  * @mask:       a bit string indicating the writeablility of trip points
1780  * @devdata:    private device data
1781  * @ops:        standard thermal zone device callbacks
1782  * @tzp:        thermal zone platform parameters
1783  * @passive_delay: number of milliseconds to wait between polls when
1784  *                 performing passive cooling
1785  * @polling_delay: number of milliseconds to wait between polls when checking
1786  *                 whether trip points have been crossed (0 for interrupt
1787  *                 driven systems)
1788  *
1789  * This interface function adds a new thermal zone device (sensor) to
1790  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1791  * thermal cooling devices registered at the same time.
1792  * thermal_zone_device_unregister() must be called when the device is no
1793  * longer needed. The passive cooling depends on the .get_trend() return value.
1794  *
1795  * Return: a pointer to the created struct thermal_zone_device or an
1796  * in case of error, an ERR_PTR. Caller must check return value with
1797  * IS_ERR*() helpers.
1798  */
1799 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1800         int trips, int mask, void *devdata,
1801         struct thermal_zone_device_ops *ops,
1802         struct thermal_zone_params *tzp,
1803         int passive_delay, int polling_delay)
1804 {
1805         struct thermal_zone_device *tz;
1806         enum thermal_trip_type trip_type;
1807         int trip_temp;
1808         int result;
1809         int count;
1810         int passive = 0;
1811         struct thermal_governor *governor;
1812
1813         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1814                 return ERR_PTR(-EINVAL);
1815
1816         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1817                 return ERR_PTR(-EINVAL);
1818
1819         if (!ops)
1820                 return ERR_PTR(-EINVAL);
1821
1822         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1823                 return ERR_PTR(-EINVAL);
1824
1825         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1826         if (!tz)
1827                 return ERR_PTR(-ENOMEM);
1828
1829         INIT_LIST_HEAD(&tz->thermal_instances);
1830         idr_init(&tz->idr);
1831         mutex_init(&tz->lock);
1832         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1833         if (result) {
1834                 kfree(tz);
1835                 return ERR_PTR(result);
1836         }
1837
1838         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1839         tz->ops = ops;
1840         tz->tzp = tzp;
1841         tz->device.class = &thermal_class;
1842         tz->devdata = devdata;
1843         tz->trips = trips;
1844         tz->passive_delay = passive_delay;
1845         tz->polling_delay = polling_delay;
1846         /* A new thermal zone needs to be updated anyway. */
1847         atomic_set(&tz->need_update, 1);
1848
1849         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1850         result = device_register(&tz->device);
1851         if (result) {
1852                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1853                 kfree(tz);
1854                 return ERR_PTR(result);
1855         }
1856
1857         /* sys I/F */
1858         if (type) {
1859                 result = device_create_file(&tz->device, &dev_attr_type);
1860                 if (result)
1861                         goto unregister;
1862         }
1863
1864         result = device_create_file(&tz->device, &dev_attr_temp);
1865         if (result)
1866                 goto unregister;
1867
1868         if (ops->get_mode) {
1869                 result = device_create_file(&tz->device, &dev_attr_mode);
1870                 if (result)
1871                         goto unregister;
1872         }
1873
1874         result = create_trip_attrs(tz, mask);
1875         if (result)
1876                 goto unregister;
1877
1878         for (count = 0; count < trips; count++) {
1879                 if (tz->ops->get_trip_type(tz, count, &trip_type))
1880                         set_bit(count, &tz->trips_disabled);
1881                 if (trip_type == THERMAL_TRIP_PASSIVE)
1882                         passive = 1;
1883                 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1884                         set_bit(count, &tz->trips_disabled);
1885                 /* Check for bogus trip points */
1886                 if (trip_temp == 0)
1887                         set_bit(count, &tz->trips_disabled);
1888         }
1889
1890         if (!passive) {
1891                 result = device_create_file(&tz->device, &dev_attr_passive);
1892                 if (result)
1893                         goto unregister;
1894         }
1895
1896         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1897                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1898                 if (result)
1899                         goto unregister;
1900         }
1901
1902         /* Create policy attribute */
1903         result = device_create_file(&tz->device, &dev_attr_policy);
1904         if (result)
1905                 goto unregister;
1906
1907         /* Add thermal zone params */
1908         result = create_tzp_attrs(&tz->device);
1909         if (result)
1910                 goto unregister;
1911
1912         /* Create available_policies attribute */
1913         result = device_create_file(&tz->device, &dev_attr_available_policies);
1914         if (result)
1915                 goto unregister;
1916
1917         /* Update 'this' zone's governor information */
1918         mutex_lock(&thermal_governor_lock);
1919
1920         if (tz->tzp)
1921                 governor = __find_governor(tz->tzp->governor_name);
1922         else
1923                 governor = def_governor;
1924
1925         result = thermal_set_governor(tz, governor);
1926         if (result) {
1927                 mutex_unlock(&thermal_governor_lock);
1928                 goto unregister;
1929         }
1930
1931         mutex_unlock(&thermal_governor_lock);
1932
1933         if (!tz->tzp || !tz->tzp->no_hwmon) {
1934                 result = thermal_add_hwmon_sysfs(tz);
1935                 if (result)
1936                         goto unregister;
1937         }
1938
1939         mutex_lock(&thermal_list_lock);
1940         list_add_tail(&tz->node, &thermal_tz_list);
1941         mutex_unlock(&thermal_list_lock);
1942
1943         /* Bind cooling devices for this zone */
1944         bind_tz(tz);
1945
1946         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1947
1948         thermal_zone_device_reset(tz);
1949         /* Update the new thermal zone and mark it as already updated. */
1950         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1951                 thermal_zone_device_update(tz);
1952
1953         return tz;
1954
1955 unregister:
1956         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1957         device_unregister(&tz->device);
1958         return ERR_PTR(result);
1959 }
1960 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1961
1962 /**
1963  * thermal_device_unregister - removes the registered thermal zone device
1964  * @tz: the thermal zone device to remove
1965  */
1966 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1967 {
1968         int i;
1969         const struct thermal_zone_params *tzp;
1970         struct thermal_cooling_device *cdev;
1971         struct thermal_zone_device *pos = NULL;
1972
1973         if (!tz)
1974                 return;
1975
1976         tzp = tz->tzp;
1977
1978         mutex_lock(&thermal_list_lock);
1979         list_for_each_entry(pos, &thermal_tz_list, node)
1980             if (pos == tz)
1981                 break;
1982         if (pos != tz) {
1983                 /* thermal zone device not found */
1984                 mutex_unlock(&thermal_list_lock);
1985                 return;
1986         }
1987         list_del(&tz->node);
1988
1989         /* Unbind all cdevs associated with 'this' thermal zone */
1990         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1991                 if (tz->ops->unbind) {
1992                         tz->ops->unbind(tz, cdev);
1993                         continue;
1994                 }
1995
1996                 if (!tzp || !tzp->tbp)
1997                         break;
1998
1999                 for (i = 0; i < tzp->num_tbps; i++) {
2000                         if (tzp->tbp[i].cdev == cdev) {
2001                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
2002                                 tzp->tbp[i].cdev = NULL;
2003                         }
2004                 }
2005         }
2006
2007         mutex_unlock(&thermal_list_lock);
2008
2009         thermal_zone_device_set_polling(tz, 0);
2010
2011         if (tz->type[0])
2012                 device_remove_file(&tz->device, &dev_attr_type);
2013         device_remove_file(&tz->device, &dev_attr_temp);
2014         if (tz->ops->get_mode)
2015                 device_remove_file(&tz->device, &dev_attr_mode);
2016         device_remove_file(&tz->device, &dev_attr_policy);
2017         device_remove_file(&tz->device, &dev_attr_available_policies);
2018         remove_trip_attrs(tz);
2019         thermal_set_governor(tz, NULL);
2020
2021         thermal_remove_hwmon_sysfs(tz);
2022         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2023         idr_destroy(&tz->idr);
2024         mutex_destroy(&tz->lock);
2025         device_unregister(&tz->device);
2026         return;
2027 }
2028 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2029
2030 /**
2031  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2032  * @name: thermal zone name to fetch the temperature
2033  *
2034  * When only one zone is found with the passed name, returns a reference to it.
2035  *
2036  * Return: On success returns a reference to an unique thermal zone with
2037  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2038  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2039  */
2040 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2041 {
2042         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2043         unsigned int found = 0;
2044
2045         if (!name)
2046                 goto exit;
2047
2048         mutex_lock(&thermal_list_lock);
2049         list_for_each_entry(pos, &thermal_tz_list, node)
2050                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2051                         found++;
2052                         ref = pos;
2053                 }
2054         mutex_unlock(&thermal_list_lock);
2055
2056         /* nothing has been found, thus an error code for it */
2057         if (found == 0)
2058                 ref = ERR_PTR(-ENODEV);
2059         else if (found > 1)
2060         /* Success only when an unique zone is found */
2061                 ref = ERR_PTR(-EEXIST);
2062
2063 exit:
2064         return ref;
2065 }
2066 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2067
2068 #ifdef CONFIG_NET
2069 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2070         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2071 };
2072
2073 static struct genl_family thermal_event_genl_family = {
2074         .id = GENL_ID_GENERATE,
2075         .name = THERMAL_GENL_FAMILY_NAME,
2076         .version = THERMAL_GENL_VERSION,
2077         .maxattr = THERMAL_GENL_ATTR_MAX,
2078         .mcgrps = thermal_event_mcgrps,
2079         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2080 };
2081
2082 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2083                                         enum events event)
2084 {
2085         struct sk_buff *skb;
2086         struct nlattr *attr;
2087         struct thermal_genl_event *thermal_event;
2088         void *msg_header;
2089         int size;
2090         int result;
2091         static unsigned int thermal_event_seqnum;
2092
2093         if (!tz)
2094                 return -EINVAL;
2095
2096         /* allocate memory */
2097         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2098                nla_total_size(0);
2099
2100         skb = genlmsg_new(size, GFP_ATOMIC);
2101         if (!skb)
2102                 return -ENOMEM;
2103
2104         /* add the genetlink message header */
2105         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2106                                  &thermal_event_genl_family, 0,
2107                                  THERMAL_GENL_CMD_EVENT);
2108         if (!msg_header) {
2109                 nlmsg_free(skb);
2110                 return -ENOMEM;
2111         }
2112
2113         /* fill the data */
2114         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2115                            sizeof(struct thermal_genl_event));
2116
2117         if (!attr) {
2118                 nlmsg_free(skb);
2119                 return -EINVAL;
2120         }
2121
2122         thermal_event = nla_data(attr);
2123         if (!thermal_event) {
2124                 nlmsg_free(skb);
2125                 return -EINVAL;
2126         }
2127
2128         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2129
2130         thermal_event->orig = tz->id;
2131         thermal_event->event = event;
2132
2133         /* send multicast genetlink message */
2134         genlmsg_end(skb, msg_header);
2135
2136         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2137                                    0, GFP_ATOMIC);
2138         if (result)
2139                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2140
2141         return result;
2142 }
2143 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2144
2145 static int genetlink_init(void)
2146 {
2147         return genl_register_family(&thermal_event_genl_family);
2148 }
2149
2150 static void genetlink_exit(void)
2151 {
2152         genl_unregister_family(&thermal_event_genl_family);
2153 }
2154 #else /* !CONFIG_NET */
2155 static inline int genetlink_init(void) { return 0; }
2156 static inline void genetlink_exit(void) {}
2157 #endif /* !CONFIG_NET */
2158
2159 static int __init thermal_register_governors(void)
2160 {
2161         int result;
2162
2163         result = thermal_gov_step_wise_register();
2164         if (result)
2165                 return result;
2166
2167         result = thermal_gov_fair_share_register();
2168         if (result)
2169                 return result;
2170
2171         result = thermal_gov_bang_bang_register();
2172         if (result)
2173                 return result;
2174
2175         result = thermal_gov_user_space_register();
2176         if (result)
2177                 return result;
2178
2179         return thermal_gov_power_allocator_register();
2180 }
2181
2182 static void thermal_unregister_governors(void)
2183 {
2184         thermal_gov_step_wise_unregister();
2185         thermal_gov_fair_share_unregister();
2186         thermal_gov_bang_bang_unregister();
2187         thermal_gov_user_space_unregister();
2188         thermal_gov_power_allocator_unregister();
2189 }
2190
2191 static int thermal_pm_notify(struct notifier_block *nb,
2192                                 unsigned long mode, void *_unused)
2193 {
2194         struct thermal_zone_device *tz;
2195
2196         switch (mode) {
2197         case PM_HIBERNATION_PREPARE:
2198         case PM_RESTORE_PREPARE:
2199         case PM_SUSPEND_PREPARE:
2200                 atomic_set(&in_suspend, 1);
2201                 break;
2202         case PM_POST_HIBERNATION:
2203         case PM_POST_RESTORE:
2204         case PM_POST_SUSPEND:
2205                 atomic_set(&in_suspend, 0);
2206                 list_for_each_entry(tz, &thermal_tz_list, node) {
2207                         thermal_zone_device_reset(tz);
2208                         thermal_zone_device_update(tz);
2209                 }
2210                 break;
2211         default:
2212                 break;
2213         }
2214         return 0;
2215 }
2216
2217 static struct notifier_block thermal_pm_nb = {
2218         .notifier_call = thermal_pm_notify,
2219 };
2220
2221 static int __init thermal_init(void)
2222 {
2223         int result;
2224
2225         result = thermal_register_governors();
2226         if (result)
2227                 goto error;
2228
2229         result = class_register(&thermal_class);
2230         if (result)
2231                 goto unregister_governors;
2232
2233         result = genetlink_init();
2234         if (result)
2235                 goto unregister_class;
2236
2237         result = of_parse_thermal_zones();
2238         if (result)
2239                 goto exit_netlink;
2240
2241         result = register_pm_notifier(&thermal_pm_nb);
2242         if (result)
2243                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2244                         result);
2245
2246         return 0;
2247
2248 exit_netlink:
2249         genetlink_exit();
2250 unregister_class:
2251         class_unregister(&thermal_class);
2252 unregister_governors:
2253         thermal_unregister_governors();
2254 error:
2255         idr_destroy(&thermal_tz_idr);
2256         idr_destroy(&thermal_cdev_idr);
2257         mutex_destroy(&thermal_idr_lock);
2258         mutex_destroy(&thermal_list_lock);
2259         mutex_destroy(&thermal_governor_lock);
2260         return result;
2261 }
2262
2263 static void __exit thermal_exit(void)
2264 {
2265         unregister_pm_notifier(&thermal_pm_nb);
2266         of_thermal_destroy_zones();
2267         genetlink_exit();
2268         class_unregister(&thermal_class);
2269         thermal_unregister_governors();
2270         idr_destroy(&thermal_tz_idr);
2271         idr_destroy(&thermal_cdev_idr);
2272         mutex_destroy(&thermal_idr_lock);
2273         mutex_destroy(&thermal_list_lock);
2274         mutex_destroy(&thermal_governor_lock);
2275 }
2276
2277 fs_initcall(thermal_init);
2278 module_exit(thermal_exit);