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 void thermal_zone_set_trips(struct thermal_zone_device *tz)
 524 {
 525         int low = -INT_MAX;
 526         int high = INT_MAX;
 527         int trip_temp, hysteresis;
 528         int i, ret;
 529
 530         mutex_lock(&tz->lock);
 531
 532         if (!tz->ops->set_trips || !tz->ops->get_trip_hyst)
 533                 goto exit;
 534
 535         for (i = 0; i < tz->trips; i++) {
 536                 int trip_low;
 537
 538                 tz->ops->get_trip_temp(tz, i, &trip_temp);
 539                 tz->ops->get_trip_hyst(tz, i, &hysteresis);
 540
 541                 trip_low = trip_temp - hysteresis;
 542
 543                 if (trip_low < tz->temperature && trip_low > low)
 544                         low = trip_low;
 545
 546                 if (trip_temp > tz->temperature && trip_temp < high)
 547                         high = trip_temp;
 548         }
 549
 550         /* No need to change trip points */
 551         if (tz->prev_low_trip == low && tz->prev_high_trip == high)
 552                 goto exit;
 553
 554         tz->prev_low_trip = low;
 555         tz->prev_high_trip = high;
 556
 557         dev_dbg(&tz->device,
 558                 "new temperature boundaries: %d < x < %d\n", low, high);
 559
 560         /*
 561          * Set a temperature window. When this window is left the driver
 562          * must inform the thermal core via thermal_zone_device_update.
 563          */
 564         ret = tz->ops->set_trips(tz, low, high);
 565         if (ret)
 566                 dev_err(&tz->device, "Failed to set trips: %d\n", ret);
 567
 568 exit:
 569         mutex_unlock(&tz->lock);
 570 }
 571 EXPORT_SYMBOL_GPL(thermal_zone_set_trips);
 572
 573 static void update_temperature(struct thermal_zone_device *tz)
 574 {
 575         int temp, ret;
 576
 577         ret = thermal_zone_get_temp(tz, &temp);
 578         if (ret) {
 579                 if (ret != -EAGAIN)
 580                         dev_warn(&tz->device,
 581                                  "failed to read out thermal zone (%d)\n",
 582                                  ret);
 583                 return;
 584         }
 585
 586         mutex_lock(&tz->lock);
 587         tz->last_temperature = tz->temperature;
 588         tz->temperature = temp;
 589         mutex_unlock(&tz->lock);
 590
 591         trace_thermal_temperature(tz);
 592         if (tz->last_temperature == THERMAL_TEMP_INVALID)
 593                 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
 594                         tz->temperature);
 595         else
 596                 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 597                         tz->last_temperature, tz->temperature);
 598 }
 599
 600 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 601 {
 602         struct thermal_instance *pos;
 603
 604         tz->temperature = THERMAL_TEMP_INVALID;
 605         tz->passive = 0;
 606         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 607                 pos->initialized = false;
 608 }
 609
 610 void thermal_zone_device_update(struct thermal_zone_device *tz,
 611                                 enum thermal_notify_event event)
 612 {
 613         int count;
 614
 615         if (atomic_read(&in_suspend))
 616                 return;
 617
 618         if (!tz->ops->get_temp)
 619                 return;
 620
 621         update_temperature(tz);
 622
 623         thermal_zone_set_trips(tz);
 624
 625         tz->notify_event = event;
 626
 627         for (count = 0; count < tz->trips; count++)
 628                 handle_thermal_trip(tz, count);
 629 }
 630 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 631
 632 static void thermal_zone_device_check(struct work_struct *work)
 633 {
 634         struct thermal_zone_device *tz = container_of(work, struct
 635                                                       thermal_zone_device,
 636                                                       poll_queue.work);
 637         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 638 }
 639
 640 /* sys I/F for thermal zone */
 641
 642 #define to_thermal_zone(_dev) \
 643         container_of(_dev, struct thermal_zone_device, device)
 644
 645 static ssize_t
 646 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 647 {
 648         struct thermal_zone_device *tz = to_thermal_zone(dev);
 649
 650         return sprintf(buf, "%s\n", tz->type);
 651 }
 652
 653 static ssize_t
 654 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 655 {
 656         struct thermal_zone_device *tz = to_thermal_zone(dev);
 657         int temperature, ret;
 658
 659         ret = thermal_zone_get_temp(tz, &temperature);
 660
 661         if (ret)
 662                 return ret;
 663
 664         return sprintf(buf, "%d\n", temperature);
 665 }
 666
 667 static ssize_t
 668 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 669 {
 670         struct thermal_zone_device *tz = to_thermal_zone(dev);
 671         enum thermal_device_mode mode;
 672         int result;
 673
 674         if (!tz->ops->get_mode)
 675                 return -EPERM;
 676
 677         result = tz->ops->get_mode(tz, &mode);
 678         if (result)
 679                 return result;
 680
 681         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 682                        : "disabled");
 683 }
 684
 685 static ssize_t
 686 mode_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 result;
 691
 692         if (!tz->ops->set_mode)
 693                 return -EPERM;
 694
 695         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 696                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 697         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 698                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 699         else
 700                 result = -EINVAL;
 701
 702         if (result)
 703                 return result;
 704
 705         return count;
 706 }
 707
 708 static ssize_t
 709 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 710                      char *buf)
 711 {
 712         struct thermal_zone_device *tz = to_thermal_zone(dev);
 713         enum thermal_trip_type type;
 714         int trip, result;
 715
 716         if (!tz->ops->get_trip_type)
 717                 return -EPERM;
 718
 719         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 720                 return -EINVAL;
 721
 722         result = tz->ops->get_trip_type(tz, trip, &type);
 723         if (result)
 724                 return result;
 725
 726         switch (type) {
 727         case THERMAL_TRIP_CRITICAL:
 728                 return sprintf(buf, "critical\n");
 729         case THERMAL_TRIP_HOT:
 730                 return sprintf(buf, "hot\n");
 731         case THERMAL_TRIP_PASSIVE:
 732                 return sprintf(buf, "passive\n");
 733         case THERMAL_TRIP_ACTIVE:
 734                 return sprintf(buf, "active\n");
 735         default:
 736                 return sprintf(buf, "unknown\n");
 737         }
 738 }
 739
 740 static ssize_t
 741 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 742                      const char *buf, size_t count)
 743 {
 744         struct thermal_zone_device *tz = to_thermal_zone(dev);
 745         int trip, ret;
 746         int temperature;
 747
 748         if (!tz->ops->set_trip_temp)
 749                 return -EPERM;
 750
 751         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 752                 return -EINVAL;
 753
 754         if (kstrtoint(buf, 10, &temperature))
 755                 return -EINVAL;
 756
 757         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 758         if (ret)
 759                 return ret;
 760
 761         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 762
 763         return count;
 764 }
 765
 766 static ssize_t
 767 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 768                      char *buf)
 769 {
 770         struct thermal_zone_device *tz = to_thermal_zone(dev);
 771         int trip, ret;
 772         int temperature;
 773
 774         if (!tz->ops->get_trip_temp)
 775                 return -EPERM;
 776
 777         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 778                 return -EINVAL;
 779
 780         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 781
 782         if (ret)
 783                 return ret;
 784
 785         return sprintf(buf, "%d\n", temperature);
 786 }
 787
 788 static ssize_t
 789 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 790                         const char *buf, size_t count)
 791 {
 792         struct thermal_zone_device *tz = to_thermal_zone(dev);
 793         int trip, ret;
 794         int temperature;
 795
 796         if (!tz->ops->set_trip_hyst)
 797                 return -EPERM;
 798
 799         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 800                 return -EINVAL;
 801
 802         if (kstrtoint(buf, 10, &temperature))
 803                 return -EINVAL;
 804
 805         /*
 806          * We are not doing any check on the 'temperature' value
 807          * here. The driver implementing 'set_trip_hyst' has to
 808          * take care of this.
 809          */
 810         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 811
 812         if (!ret)
 813                 thermal_zone_set_trips(tz);
 814
 815         return ret ? ret : count;
 816 }
 817
 818 static ssize_t
 819 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 820                         char *buf)
 821 {
 822         struct thermal_zone_device *tz = to_thermal_zone(dev);
 823         int trip, ret;
 824         int temperature;
 825
 826         if (!tz->ops->get_trip_hyst)
 827                 return -EPERM;
 828
 829         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 830                 return -EINVAL;
 831
 832         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 833
 834         return ret ? ret : sprintf(buf, "%d\n", temperature);
 835 }
 836
 837 static ssize_t
 838 passive_store(struct device *dev, struct device_attribute *attr,
 839                     const char *buf, size_t count)
 840 {
 841         struct thermal_zone_device *tz = to_thermal_zone(dev);
 842         struct thermal_cooling_device *cdev = NULL;
 843         int state;
 844
 845         if (!sscanf(buf, "%d\n", &state))
 846                 return -EINVAL;
 847
 848         /* sanity check: values below 1000 millicelcius don't make sense
 849          * and can cause the system to go into a thermal heart attack
 850          */
 851         if (state && state < 1000)
 852                 return -EINVAL;
 853
 854         if (state && !tz->forced_passive) {
 855                 mutex_lock(&thermal_list_lock);
 856                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 857                         if (!strncmp("Processor", cdev->type,
 858                                      sizeof("Processor")))
 859                                 thermal_zone_bind_cooling_device(tz,
 860                                                 THERMAL_TRIPS_NONE, cdev,
 861                                                 THERMAL_NO_LIMIT,
 862                                                 THERMAL_NO_LIMIT,
 863                                                 THERMAL_WEIGHT_DEFAULT);
 864                 }
 865                 mutex_unlock(&thermal_list_lock);
 866                 if (!tz->passive_delay)
 867                         tz->passive_delay = 1000;
 868         } else if (!state && tz->forced_passive) {
 869                 mutex_lock(&thermal_list_lock);
 870                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 871                         if (!strncmp("Processor", cdev->type,
 872                                      sizeof("Processor")))
 873                                 thermal_zone_unbind_cooling_device(tz,
 874                                                                    THERMAL_TRIPS_NONE,
 875                                                                    cdev);
 876                 }
 877                 mutex_unlock(&thermal_list_lock);
 878                 tz->passive_delay = 0;
 879         }
 880
 881         tz->forced_passive = state;
 882
 883         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 884
 885         return count;
 886 }
 887
 888 static ssize_t
 889 passive_show(struct device *dev, struct device_attribute *attr,
 890                    char *buf)
 891 {
 892         struct thermal_zone_device *tz = to_thermal_zone(dev);
 893
 894         return sprintf(buf, "%d\n", tz->forced_passive);
 895 }
 896
 897 static ssize_t
 898 policy_store(struct device *dev, struct device_attribute *attr,
 899                     const char *buf, size_t count)
 900 {
 901         int ret = -EINVAL;
 902         struct thermal_zone_device *tz = to_thermal_zone(dev);
 903         struct thermal_governor *gov;
 904         char name[THERMAL_NAME_LENGTH];
 905
 906         snprintf(name, sizeof(name), "%s", buf);
 907
 908         mutex_lock(&thermal_governor_lock);
 909         mutex_lock(&tz->lock);
 910
 911         gov = __find_governor(strim(name));
 912         if (!gov)
 913                 goto exit;
 914
 915         ret = thermal_set_governor(tz, gov);
 916         if (!ret)
 917                 ret = count;
 918
 919 exit:
 920         mutex_unlock(&tz->lock);
 921         mutex_unlock(&thermal_governor_lock);
 922         return ret;
 923 }
 924
 925 static ssize_t
 926 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 927 {
 928         struct thermal_zone_device *tz = to_thermal_zone(dev);
 929
 930         return sprintf(buf, "%s\n", tz->governor->name);
 931 }
 932
 933 static ssize_t
 934 available_policies_show(struct device *dev, struct device_attribute *devattr,
 935                         char *buf)
 936 {
 937         struct thermal_governor *pos;
 938         ssize_t count = 0;
 939         ssize_t size = PAGE_SIZE;
 940
 941         mutex_lock(&thermal_governor_lock);
 942
 943         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 944                 size = PAGE_SIZE - count;
 945                 count += scnprintf(buf + count, size, "%s ", pos->name);
 946         }
 947         count += scnprintf(buf + count, size, "\n");
 948
 949         mutex_unlock(&thermal_governor_lock);
 950
 951         return count;
 952 }
 953
 954 static ssize_t
 955 emul_temp_store(struct device *dev, struct device_attribute *attr,
 956                      const char *buf, size_t count)
 957 {
 958         struct thermal_zone_device *tz = to_thermal_zone(dev);
 959         int ret = 0;
 960         int temperature;
 961
 962         if (kstrtoint(buf, 10, &temperature))
 963                 return -EINVAL;
 964
 965         if (!tz->ops->set_emul_temp) {
 966                 mutex_lock(&tz->lock);
 967                 tz->emul_temperature = temperature;
 968                 mutex_unlock(&tz->lock);
 969         } else {
 970                 ret = tz->ops->set_emul_temp(tz, temperature);
 971         }
 972
 973         if (!ret)
 974                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 975
 976         return ret ? ret : count;
 977 }
 978 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 979
 980 static ssize_t
 981 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 982                        char *buf)
 983 {
 984         struct thermal_zone_device *tz = to_thermal_zone(dev);
 985
 986         if (tz->tzp)
 987                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 988         else
 989                 return -EIO;
 990 }
 991
 992 static ssize_t
 993 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 994                         const char *buf, size_t count)
 995 {
 996         struct thermal_zone_device *tz = to_thermal_zone(dev);
 997         u32 sustainable_power;
 998
 999         if (!tz->tzp)
1000                 return -EIO;
1001
1002         if (kstrtou32(buf, 10, &sustainable_power))
1003                 return -EINVAL;
1004
1005         tz->tzp->sustainable_power = sustainable_power;
1006
1007         return count;
1008 }
1009 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
1010                 sustainable_power_store);
1011
1012 #define create_s32_tzp_attr(name)                                       \
1013         static ssize_t                                                  \
1014         name##_show(struct device *dev, struct device_attribute *devattr, \
1015                 char *buf)                                              \
1016         {                                                               \
1017         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
1018                                                                         \
1019         if (tz->tzp)                                                    \
1020                 return sprintf(buf, "%d\n", tz->tzp->name);             \
1021         else                                                            \
1022                 return -EIO;                                            \
1023         }                                                               \
1024                                                                         \
1025         static ssize_t                                                  \
1026         name##_store(struct device *dev, struct device_attribute *devattr, \
1027                 const char *buf, size_t count)                          \
1028         {                                                               \
1029                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
1030                 s32 value;                                              \
1031                                                                         \
1032                 if (!tz->tzp)                                           \
1033                         return -EIO;                                    \
1034                                                                         \
1035                 if (kstrtos32(buf, 10, &value))                         \
1036                         return -EINVAL;                                 \
1037                                                                         \
1038                 tz->tzp->name = value;                                  \
1039                                                                         \
1040                 return count;                                           \
1041         }                                                               \
1042         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
1043
1044 create_s32_tzp_attr(k_po);
1045 create_s32_tzp_attr(k_pu);
1046 create_s32_tzp_attr(k_i);
1047 create_s32_tzp_attr(k_d);
1048 create_s32_tzp_attr(integral_cutoff);
1049 create_s32_tzp_attr(slope);
1050 create_s32_tzp_attr(offset);
1051 #undef create_s32_tzp_attr
1052
1053 static struct device_attribute *dev_tzp_attrs[] = {
1054         &dev_attr_sustainable_power,
1055         &dev_attr_k_po,
1056         &dev_attr_k_pu,
1057         &dev_attr_k_i,
1058         &dev_attr_k_d,
1059         &dev_attr_integral_cutoff,
1060         &dev_attr_slope,
1061         &dev_attr_offset,
1062 };
1063
1064 static int create_tzp_attrs(struct device *dev)
1065 {
1066         int i;
1067
1068         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1069                 int ret;
1070                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1071
1072                 ret = device_create_file(dev, dev_attr);
1073                 if (ret)
1074                         return ret;
1075         }
1076
1077         return 0;
1078 }
1079
1080 /**
1081  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1082  * @cdev:       pointer to &thermal_cooling_device
1083  * @tz:         a valid thermal zone device pointer
1084  * @max_power:  pointer in which to store the maximum power
1085  *
1086  * Calculate the maximum power consumption in milliwats that the
1087  * cooling device can currently consume and store it in @max_power.
1088  *
1089  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1090  * power_actor API or -E* on other error.
1091  */
1092 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1093                               struct thermal_zone_device *tz, u32 *max_power)
1094 {
1095         if (!cdev_is_power_actor(cdev))
1096                 return -EINVAL;
1097
1098         return cdev->ops->state2power(cdev, tz, 0, max_power);
1099 }
1100
1101 /**
1102  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1103  * @cdev:       pointer to &thermal_cooling_device
1104  * @tz:         a valid thermal zone device pointer
1105  * @min_power:  pointer in which to store the minimum power
1106  *
1107  * Calculate the minimum power consumption in milliwatts that the
1108  * cooling device can currently consume and store it in @min_power.
1109  *
1110  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1111  * power_actor API or -E* on other error.
1112  */
1113 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1114                               struct thermal_zone_device *tz, u32 *min_power)
1115 {
1116         unsigned long max_state;
1117         int ret;
1118
1119         if (!cdev_is_power_actor(cdev))
1120                 return -EINVAL;
1121
1122         ret = cdev->ops->get_max_state(cdev, &max_state);
1123         if (ret)
1124                 return ret;
1125
1126         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1127 }
1128
1129 /**
1130  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1131  * @cdev:       pointer to &thermal_cooling_device
1132  * @instance:   thermal instance to update
1133  * @power:      the power in milliwatts
1134  *
1135  * Set the cooling device to consume at most @power milliwatts.
1136  *
1137  * Return: 0 on success, -EINVAL if the cooling device does not
1138  * implement the power actor API or -E* for other failures.
1139  */
1140 int power_actor_set_power(struct thermal_cooling_device *cdev,
1141                           struct thermal_instance *instance, u32 power)
1142 {
1143         unsigned long state;
1144         int ret;
1145
1146         if (!cdev_is_power_actor(cdev))
1147                 return -EINVAL;
1148
1149         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1150         if (ret)
1151                 return ret;
1152
1153         instance->target = state;
1154         mutex_lock(&cdev->lock);
1155         cdev->updated = false;
1156         mutex_unlock(&cdev->lock);
1157         thermal_cdev_update(cdev);
1158
1159         return 0;
1160 }
1161
1162 static DEVICE_ATTR(type, 0444, type_show, NULL);
1163 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1164 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1165 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1166 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1167 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1168
1169 /* sys I/F for cooling device */
1170 #define to_cooling_device(_dev) \
1171         container_of(_dev, struct thermal_cooling_device, device)
1172
1173 static ssize_t
1174 thermal_cooling_device_type_show(struct device *dev,
1175                                  struct device_attribute *attr, char *buf)
1176 {
1177         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1178
1179         return sprintf(buf, "%s\n", cdev->type);
1180 }
1181
1182 static ssize_t
1183 thermal_cooling_device_max_state_show(struct device *dev,
1184                                       struct device_attribute *attr, char *buf)
1185 {
1186         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1187         unsigned long state;
1188         int ret;
1189
1190         ret = cdev->ops->get_max_state(cdev, &state);
1191         if (ret)
1192                 return ret;
1193         return sprintf(buf, "%ld\n", state);
1194 }
1195
1196 static ssize_t
1197 thermal_cooling_device_cur_state_show(struct device *dev,
1198                                       struct device_attribute *attr, char *buf)
1199 {
1200         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1201         unsigned long state;
1202         int ret;
1203
1204         ret = cdev->ops->get_cur_state(cdev, &state);
1205         if (ret)
1206                 return ret;
1207         return sprintf(buf, "%ld\n", state);
1208 }
1209
1210 static ssize_t
1211 thermal_cooling_device_cur_state_store(struct device *dev,
1212                                        struct device_attribute *attr,
1213                                        const char *buf, size_t count)
1214 {
1215         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1216         unsigned long state;
1217         int result;
1218
1219         if (!sscanf(buf, "%ld\n", &state))
1220                 return -EINVAL;
1221
1222         if ((long)state < 0)
1223                 return -EINVAL;
1224
1225         result = cdev->ops->set_cur_state(cdev, state);
1226         if (result)
1227                 return result;
1228         return count;
1229 }
1230
1231 static struct device_attribute dev_attr_cdev_type =
1232 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1233 static DEVICE_ATTR(max_state, 0444,
1234                    thermal_cooling_device_max_state_show, NULL);
1235 static DEVICE_ATTR(cur_state, 0644,
1236                    thermal_cooling_device_cur_state_show,
1237                    thermal_cooling_device_cur_state_store);
1238
1239 static ssize_t
1240 thermal_cooling_device_trip_point_show(struct device *dev,
1241                                        struct device_attribute *attr, char *buf)
1242 {
1243         struct thermal_instance *instance;
1244
1245         instance =
1246             container_of(attr, struct thermal_instance, attr);
1247
1248         if (instance->trip == THERMAL_TRIPS_NONE)
1249                 return sprintf(buf, "-1\n");
1250         else
1251                 return sprintf(buf, "%d\n", instance->trip);
1252 }
1253
1254 static struct attribute *cooling_device_attrs[] = {
1255         &dev_attr_cdev_type.attr,
1256         &dev_attr_max_state.attr,
1257         &dev_attr_cur_state.attr,
1258         NULL,
1259 };
1260
1261 static const struct attribute_group cooling_device_attr_group = {
1262         .attrs = cooling_device_attrs,
1263 };
1264
1265 static const struct attribute_group *cooling_device_attr_groups[] = {
1266         &cooling_device_attr_group,
1267         NULL,
1268 };
1269
1270 static ssize_t
1271 thermal_cooling_device_weight_show(struct device *dev,
1272                                    struct device_attribute *attr, char *buf)
1273 {
1274         struct thermal_instance *instance;
1275
1276         instance = container_of(attr, struct thermal_instance, weight_attr);
1277
1278         return sprintf(buf, "%d\n", instance->weight);
1279 }
1280
1281 static ssize_t
1282 thermal_cooling_device_weight_store(struct device *dev,
1283                                     struct device_attribute *attr,
1284                                     const char *buf, size_t count)
1285 {
1286         struct thermal_instance *instance;
1287         int ret, weight;
1288
1289         ret = kstrtoint(buf, 0, &weight);
1290         if (ret)
1291                 return ret;
1292
1293         instance = container_of(attr, struct thermal_instance, weight_attr);
1294         instance->weight = weight;
1295
1296         return count;
1297 }
1298 /* Device management */
1299
1300 /**
1301  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1302  * @tz:         pointer to struct thermal_zone_device
1303  * @trip:       indicates which trip point the cooling devices is
1304  *              associated with in this thermal zone.
1305  * @cdev:       pointer to struct thermal_cooling_device
1306  * @upper:      the Maximum cooling state for this trip point.
1307  *              THERMAL_NO_LIMIT means no upper limit,
1308  *              and the cooling device can be in max_state.
1309  * @lower:      the Minimum cooling state can be used for this trip point.
1310  *              THERMAL_NO_LIMIT means no lower limit,
1311  *              and the cooling device can be in cooling state 0.
1312  * @weight:     The weight of the cooling device to be bound to the
1313  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1314  *              default value
1315  *
1316  * This interface function bind a thermal cooling device to the certain trip
1317  * point of a thermal zone device.
1318  * This function is usually called in the thermal zone device .bind callback.
1319  *
1320  * Return: 0 on success, the proper error value otherwise.
1321  */
1322 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1323                                      int trip,
1324                                      struct thermal_cooling_device *cdev,
1325                                      unsigned long upper, unsigned long lower,
1326                                      unsigned int weight)
1327 {
1328         struct thermal_instance *dev;
1329         struct thermal_instance *pos;
1330         struct thermal_zone_device *pos1;
1331         struct thermal_cooling_device *pos2;
1332         unsigned long max_state;
1333         int result, ret;
1334
1335         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1336                 return -EINVAL;
1337
1338         list_for_each_entry(pos1, &thermal_tz_list, node) {
1339                 if (pos1 == tz)
1340                         break;
1341         }
1342         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1343                 if (pos2 == cdev)
1344                         break;
1345         }
1346
1347         if (tz != pos1 || cdev != pos2)
1348                 return -EINVAL;
1349
1350         ret = cdev->ops->get_max_state(cdev, &max_state);
1351         if (ret)
1352                 return ret;
1353
1354         /* lower default 0, upper default max_state */
1355         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1356         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1357
1358         if (lower > upper || upper > max_state)
1359                 return -EINVAL;
1360
1361         dev =
1362             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1363         if (!dev)
1364                 return -ENOMEM;
1365         dev->tz = tz;
1366         dev->cdev = cdev;
1367         dev->trip = trip;
1368         dev->upper = upper;
1369         dev->lower = lower;
1370         dev->target = THERMAL_NO_TARGET;
1371         dev->weight = weight;
1372
1373         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1374         if (result)
1375                 goto free_mem;
1376
1377         sprintf(dev->name, "cdev%d", dev->id);
1378         result =
1379             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1380         if (result)
1381                 goto release_idr;
1382
1383         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1384         sysfs_attr_init(&dev->attr.attr);
1385         dev->attr.attr.name = dev->attr_name;
1386         dev->attr.attr.mode = 0444;
1387         dev->attr.show = thermal_cooling_device_trip_point_show;
1388         result = device_create_file(&tz->device, &dev->attr);
1389         if (result)
1390                 goto remove_symbol_link;
1391
1392         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1393         sysfs_attr_init(&dev->weight_attr.attr);
1394         dev->weight_attr.attr.name = dev->weight_attr_name;
1395         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1396         dev->weight_attr.show = thermal_cooling_device_weight_show;
1397         dev->weight_attr.store = thermal_cooling_device_weight_store;
1398         result = device_create_file(&tz->device, &dev->weight_attr);
1399         if (result)
1400                 goto remove_trip_file;
1401
1402         mutex_lock(&tz->lock);
1403         mutex_lock(&cdev->lock);
1404         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1405             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1406                 result = -EEXIST;
1407                 break;
1408         }
1409         if (!result) {
1410                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1411                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1412                 atomic_set(&tz->need_update, 1);
1413         }
1414         mutex_unlock(&cdev->lock);
1415         mutex_unlock(&tz->lock);
1416
1417         if (!result)
1418                 return 0;
1419
1420         device_remove_file(&tz->device, &dev->weight_attr);
1421 remove_trip_file:
1422         device_remove_file(&tz->device, &dev->attr);
1423 remove_symbol_link:
1424         sysfs_remove_link(&tz->device.kobj, dev->name);
1425 release_idr:
1426         release_idr(&tz->idr, &tz->lock, dev->id);
1427 free_mem:
1428         kfree(dev);
1429         return result;
1430 }
1431 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1432
1433 /**
1434  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1435  *                                        thermal zone.
1436  * @tz:         pointer to a struct thermal_zone_device.
1437  * @trip:       indicates which trip point the cooling devices is
1438  *              associated with in this thermal zone.
1439  * @cdev:       pointer to a struct thermal_cooling_device.
1440  *
1441  * This interface function unbind a thermal cooling device from the certain
1442  * trip point of a thermal zone device.
1443  * This function is usually called in the thermal zone device .unbind callback.
1444  *
1445  * Return: 0 on success, the proper error value otherwise.
1446  */
1447 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1448                                        int trip,
1449                                        struct thermal_cooling_device *cdev)
1450 {
1451         struct thermal_instance *pos, *next;
1452
1453         mutex_lock(&tz->lock);
1454         mutex_lock(&cdev->lock);
1455         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1456                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1457                         list_del(&pos->tz_node);
1458                         list_del(&pos->cdev_node);
1459                         mutex_unlock(&cdev->lock);
1460                         mutex_unlock(&tz->lock);
1461                         goto unbind;
1462                 }
1463         }
1464         mutex_unlock(&cdev->lock);
1465         mutex_unlock(&tz->lock);
1466
1467         return -ENODEV;
1468
1469 unbind:
1470         device_remove_file(&tz->device, &pos->weight_attr);
1471         device_remove_file(&tz->device, &pos->attr);
1472         sysfs_remove_link(&tz->device.kobj, pos->name);
1473         release_idr(&tz->idr, &tz->lock, pos->id);
1474         kfree(pos);
1475         return 0;
1476 }
1477 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1478
1479 static void thermal_release(struct device *dev)
1480 {
1481         struct thermal_zone_device *tz;
1482         struct thermal_cooling_device *cdev;
1483
1484         if (!strncmp(dev_name(dev), "thermal_zone",
1485                      sizeof("thermal_zone") - 1)) {
1486                 tz = to_thermal_zone(dev);
1487                 kfree(tz);
1488         } else if(!strncmp(dev_name(dev), "cooling_device",
1489                         sizeof("cooling_device") - 1)){
1490                 cdev = to_cooling_device(dev);
1491                 kfree(cdev);
1492         }
1493 }
1494
1495 static struct class thermal_class = {
1496         .name = "thermal",
1497         .dev_release = thermal_release,
1498 };
1499
1500 /**
1501  * __thermal_cooling_device_register() - register a new thermal cooling device
1502  * @np:         a pointer to a device tree node.
1503  * @type:       the thermal cooling device type.
1504  * @devdata:    device private data.
1505  * @ops:                standard thermal cooling devices callbacks.
1506  *
1507  * This interface function adds a new thermal cooling device (fan/processor/...)
1508  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1509  * to all the thermal zone devices registered at the same time.
1510  * It also gives the opportunity to link the cooling device to a device tree
1511  * node, so that it can be bound to a thermal zone created out of device tree.
1512  *
1513  * Return: a pointer to the created struct thermal_cooling_device or an
1514  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1515  */
1516 static struct thermal_cooling_device *
1517 __thermal_cooling_device_register(struct device_node *np,
1518                                   char *type, void *devdata,
1519                                   const struct thermal_cooling_device_ops *ops)
1520 {
1521         struct thermal_cooling_device *cdev;
1522         struct thermal_zone_device *pos = NULL;
1523         int result;
1524
1525         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1526                 return ERR_PTR(-EINVAL);
1527
1528         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1529             !ops->set_cur_state)
1530                 return ERR_PTR(-EINVAL);
1531
1532         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1533         if (!cdev)
1534                 return ERR_PTR(-ENOMEM);
1535
1536         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1537         if (result) {
1538                 kfree(cdev);
1539                 return ERR_PTR(result);
1540         }
1541
1542         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1543         mutex_init(&cdev->lock);
1544         INIT_LIST_HEAD(&cdev->thermal_instances);
1545         cdev->np = np;
1546         cdev->ops = ops;
1547         cdev->updated = false;
1548         cdev->device.class = &thermal_class;
1549         cdev->device.groups = cooling_device_attr_groups;
1550         cdev->devdata = devdata;
1551         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1552         result = device_register(&cdev->device);
1553         if (result) {
1554                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1555                 kfree(cdev);
1556                 return ERR_PTR(result);
1557         }
1558
1559         /* Add 'this' new cdev to the global cdev list */
1560         mutex_lock(&thermal_list_lock);
1561         list_add(&cdev->node, &thermal_cdev_list);
1562         mutex_unlock(&thermal_list_lock);
1563
1564         /* Update binding information for 'this' new cdev */
1565         bind_cdev(cdev);
1566
1567         mutex_lock(&thermal_list_lock);
1568         list_for_each_entry(pos, &thermal_tz_list, node)
1569                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1570                         thermal_zone_device_update(pos,
1571                                                    THERMAL_EVENT_UNSPECIFIED);
1572         mutex_unlock(&thermal_list_lock);
1573
1574         return cdev;
1575 }
1576
1577 /**
1578  * thermal_cooling_device_register() - register a new thermal cooling device
1579  * @type:       the thermal cooling device type.
1580  * @devdata:    device private data.
1581  * @ops:                standard thermal cooling devices callbacks.
1582  *
1583  * This interface function adds a new thermal cooling device (fan/processor/...)
1584  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1585  * to all the thermal zone devices registered at the same time.
1586  *
1587  * Return: a pointer to the created struct thermal_cooling_device or an
1588  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1589  */
1590 struct thermal_cooling_device *
1591 thermal_cooling_device_register(char *type, void *devdata,
1592                                 const struct thermal_cooling_device_ops *ops)
1593 {
1594         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1595 }
1596 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1597
1598 /**
1599  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1600  * @np:         a pointer to a device tree node.
1601  * @type:       the thermal cooling device type.
1602  * @devdata:    device private data.
1603  * @ops:                standard thermal cooling devices callbacks.
1604  *
1605  * This function will register a cooling device with device tree node reference.
1606  * This interface function adds a new thermal cooling device (fan/processor/...)
1607  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1608  * to all the thermal zone devices registered at the same time.
1609  *
1610  * Return: a pointer to the created struct thermal_cooling_device or an
1611  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1612  */
1613 struct thermal_cooling_device *
1614 thermal_of_cooling_device_register(struct device_node *np,
1615                                    char *type, void *devdata,
1616                                    const struct thermal_cooling_device_ops *ops)
1617 {
1618         return __thermal_cooling_device_register(np, type, devdata, ops);
1619 }
1620 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1621
1622 /**
1623  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1624  * @cdev:       the thermal cooling device to remove.
1625  *
1626  * thermal_cooling_device_unregister() must be called when the device is no
1627  * longer needed.
1628  */
1629 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1630 {
1631         int i;
1632         const struct thermal_zone_params *tzp;
1633         struct thermal_zone_device *tz;
1634         struct thermal_cooling_device *pos = NULL;
1635
1636         if (!cdev)
1637                 return;
1638
1639         mutex_lock(&thermal_list_lock);
1640         list_for_each_entry(pos, &thermal_cdev_list, node)
1641             if (pos == cdev)
1642                 break;
1643         if (pos != cdev) {
1644                 /* thermal cooling device not found */
1645                 mutex_unlock(&thermal_list_lock);
1646                 return;
1647         }
1648         list_del(&cdev->node);
1649
1650         /* Unbind all thermal zones associated with 'this' cdev */
1651         list_for_each_entry(tz, &thermal_tz_list, node) {
1652                 if (tz->ops->unbind) {
1653                         tz->ops->unbind(tz, cdev);
1654                         continue;
1655                 }
1656
1657                 if (!tz->tzp || !tz->tzp->tbp)
1658                         continue;
1659
1660                 tzp = tz->tzp;
1661                 for (i = 0; i < tzp->num_tbps; i++) {
1662                         if (tzp->tbp[i].cdev == cdev) {
1663                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1664                                 tzp->tbp[i].cdev = NULL;
1665                         }
1666                 }
1667         }
1668
1669         mutex_unlock(&thermal_list_lock);
1670
1671         if (cdev->type[0])
1672                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1673         device_remove_file(&cdev->device, &dev_attr_max_state);
1674         device_remove_file(&cdev->device, &dev_attr_cur_state);
1675
1676         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1677         device_unregister(&cdev->device);
1678         return;
1679 }
1680 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1681
1682 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1683 {
1684         struct thermal_instance *instance;
1685         unsigned long target = 0;
1686
1687         mutex_lock(&cdev->lock);
1688         /* cooling device is updated*/
1689         if (cdev->updated) {
1690                 mutex_unlock(&cdev->lock);
1691                 return;
1692         }
1693
1694         /* Make sure cdev enters the deepest cooling state */
1695         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1696                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1697                                 instance->tz->id, instance->target);
1698                 if (instance->target == THERMAL_NO_TARGET)
1699                         continue;
1700                 if (instance->target > target)
1701                         target = instance->target;
1702         }
1703         cdev->ops->set_cur_state(cdev, target);
1704         cdev->updated = true;
1705         mutex_unlock(&cdev->lock);
1706         trace_cdev_update(cdev, target);
1707         dev_dbg(&cdev->device, "set to state %lu\n", target);
1708 }
1709 EXPORT_SYMBOL(thermal_cdev_update);
1710
1711 /**
1712  * thermal_notify_framework - Sensor drivers use this API to notify framework
1713  * @tz:         thermal zone device
1714  * @trip:       indicates which trip point has been crossed
1715  *
1716  * This function handles the trip events from sensor drivers. It starts
1717  * throttling the cooling devices according to the policy configured.
1718  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1719  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1720  * The throttling policy is based on the configured platform data; if no
1721  * platform data is provided, this uses the step_wise throttling policy.
1722  */
1723 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1724 {
1725         handle_thermal_trip(tz, trip);
1726 }
1727 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1728
1729 /**
1730  * create_trip_attrs() - create attributes for trip points
1731  * @tz:         the thermal zone device
1732  * @mask:       Writeable trip point bitmap.
1733  *
1734  * helper function to instantiate sysfs entries for every trip
1735  * point and its properties of a struct thermal_zone_device.
1736  *
1737  * Return: 0 on success, the proper error value otherwise.
1738  */
1739 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1740 {
1741         int indx;
1742         int size = sizeof(struct thermal_attr) * tz->trips;
1743
1744         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1745         if (!tz->trip_type_attrs)
1746                 return -ENOMEM;
1747
1748         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1749         if (!tz->trip_temp_attrs) {
1750                 kfree(tz->trip_type_attrs);
1751                 return -ENOMEM;
1752         }
1753
1754         if (tz->ops->get_trip_hyst) {
1755                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1756                 if (!tz->trip_hyst_attrs) {
1757                         kfree(tz->trip_type_attrs);
1758                         kfree(tz->trip_temp_attrs);
1759                         return -ENOMEM;
1760                 }
1761         }
1762
1763
1764         for (indx = 0; indx < tz->trips; indx++) {
1765                 /* create trip type attribute */
1766                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1767                          "trip_point_%d_type", indx);
1768
1769                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1770                 tz->trip_type_attrs[indx].attr.attr.name =
1771                                                 tz->trip_type_attrs[indx].name;
1772                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1773                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1774
1775                 device_create_file(&tz->device,
1776                                    &tz->trip_type_attrs[indx].attr);
1777
1778                 /* create trip temp attribute */
1779                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1780                          "trip_point_%d_temp", indx);
1781
1782                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1783                 tz->trip_temp_attrs[indx].attr.attr.name =
1784                                                 tz->trip_temp_attrs[indx].name;
1785                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1786                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1787                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1788                     mask & (1 << indx)) {
1789                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1790                         tz->trip_temp_attrs[indx].attr.store =
1791                                                         trip_point_temp_store;
1792                 }
1793
1794                 device_create_file(&tz->device,
1795                                    &tz->trip_temp_attrs[indx].attr);
1796
1797                 /* create Optional trip hyst attribute */
1798                 if (!tz->ops->get_trip_hyst)
1799                         continue;
1800                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1801                          "trip_point_%d_hyst", indx);
1802
1803                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1804                 tz->trip_hyst_attrs[indx].attr.attr.name =
1805                                         tz->trip_hyst_attrs[indx].name;
1806                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1807                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1808                 if (tz->ops->set_trip_hyst) {
1809                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1810                         tz->trip_hyst_attrs[indx].attr.store =
1811                                         trip_point_hyst_store;
1812                 }
1813
1814                 device_create_file(&tz->device,
1815                                    &tz->trip_hyst_attrs[indx].attr);
1816         }
1817         return 0;
1818 }
1819
1820 static void remove_trip_attrs(struct thermal_zone_device *tz)
1821 {
1822         int indx;
1823
1824         for (indx = 0; indx < tz->trips; indx++) {
1825                 device_remove_file(&tz->device,
1826                                    &tz->trip_type_attrs[indx].attr);
1827                 device_remove_file(&tz->device,
1828                                    &tz->trip_temp_attrs[indx].attr);
1829                 if (tz->ops->get_trip_hyst)
1830                         device_remove_file(&tz->device,
1831                                   &tz->trip_hyst_attrs[indx].attr);
1832         }
1833         kfree(tz->trip_type_attrs);
1834         kfree(tz->trip_temp_attrs);
1835         kfree(tz->trip_hyst_attrs);
1836 }
1837
1838 /**
1839  * thermal_zone_device_register() - register a new thermal zone device
1840  * @type:       the thermal zone device type
1841  * @trips:      the number of trip points the thermal zone support
1842  * @mask:       a bit string indicating the writeablility of trip points
1843  * @devdata:    private device data
1844  * @ops:        standard thermal zone device callbacks
1845  * @tzp:        thermal zone platform parameters
1846  * @passive_delay: number of milliseconds to wait between polls when
1847  *                 performing passive cooling
1848  * @polling_delay: number of milliseconds to wait between polls when checking
1849  *                 whether trip points have been crossed (0 for interrupt
1850  *                 driven systems)
1851  *
1852  * This interface function adds a new thermal zone device (sensor) to
1853  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1854  * thermal cooling devices registered at the same time.
1855  * thermal_zone_device_unregister() must be called when the device is no
1856  * longer needed. The passive cooling depends on the .get_trend() return value.
1857  *
1858  * Return: a pointer to the created struct thermal_zone_device or an
1859  * in case of error, an ERR_PTR. Caller must check return value with
1860  * IS_ERR*() helpers.
1861  */
1862 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1863         int trips, int mask, void *devdata,
1864         struct thermal_zone_device_ops *ops,
1865         struct thermal_zone_params *tzp,
1866         int passive_delay, int polling_delay)
1867 {
1868         struct thermal_zone_device *tz;
1869         enum thermal_trip_type trip_type;
1870         int trip_temp;
1871         int result;
1872         int count;
1873         int passive = 0;
1874         struct thermal_governor *governor;
1875
1876         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1877                 return ERR_PTR(-EINVAL);
1878
1879         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1880                 return ERR_PTR(-EINVAL);
1881
1882         if (!ops)
1883                 return ERR_PTR(-EINVAL);
1884
1885         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1886                 return ERR_PTR(-EINVAL);
1887
1888         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1889         if (!tz)
1890                 return ERR_PTR(-ENOMEM);
1891
1892         INIT_LIST_HEAD(&tz->thermal_instances);
1893         idr_init(&tz->idr);
1894         mutex_init(&tz->lock);
1895         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1896         if (result) {
1897                 kfree(tz);
1898                 return ERR_PTR(result);
1899         }
1900
1901         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1902         tz->ops = ops;
1903         tz->tzp = tzp;
1904         tz->device.class = &thermal_class;
1905         tz->devdata = devdata;
1906         tz->trips = trips;
1907         tz->passive_delay = passive_delay;
1908         tz->polling_delay = polling_delay;
1909         /* A new thermal zone needs to be updated anyway. */
1910         atomic_set(&tz->need_update, 1);
1911
1912         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1913         result = device_register(&tz->device);
1914         if (result) {
1915                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1916                 kfree(tz);
1917                 return ERR_PTR(result);
1918         }
1919
1920         /* sys I/F */
1921         if (type) {
1922                 result = device_create_file(&tz->device, &dev_attr_type);
1923                 if (result)
1924                         goto unregister;
1925         }
1926
1927         result = device_create_file(&tz->device, &dev_attr_temp);
1928         if (result)
1929                 goto unregister;
1930
1931         if (ops->get_mode) {
1932                 result = device_create_file(&tz->device, &dev_attr_mode);
1933                 if (result)
1934                         goto unregister;
1935         }
1936
1937         result = create_trip_attrs(tz, mask);
1938         if (result)
1939                 goto unregister;
1940
1941         for (count = 0; count < trips; count++) {
1942                 if (tz->ops->get_trip_type(tz, count, &trip_type))
1943                         set_bit(count, &tz->trips_disabled);
1944                 if (trip_type == THERMAL_TRIP_PASSIVE)
1945                         passive = 1;
1946                 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1947                         set_bit(count, &tz->trips_disabled);
1948                 /* Check for bogus trip points */
1949                 if (trip_temp == 0)
1950                         set_bit(count, &tz->trips_disabled);
1951         }
1952
1953         if (!passive) {
1954                 result = device_create_file(&tz->device, &dev_attr_passive);
1955                 if (result)
1956                         goto unregister;
1957         }
1958
1959         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1960                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1961                 if (result)
1962                         goto unregister;
1963         }
1964
1965         /* Create policy attribute */
1966         result = device_create_file(&tz->device, &dev_attr_policy);
1967         if (result)
1968                 goto unregister;
1969
1970         /* Add thermal zone params */
1971         result = create_tzp_attrs(&tz->device);
1972         if (result)
1973                 goto unregister;
1974
1975         /* Create available_policies attribute */
1976         result = device_create_file(&tz->device, &dev_attr_available_policies);
1977         if (result)
1978                 goto unregister;
1979
1980         /* Update 'this' zone's governor information */
1981         mutex_lock(&thermal_governor_lock);
1982
1983         if (tz->tzp)
1984                 governor = __find_governor(tz->tzp->governor_name);
1985         else
1986                 governor = def_governor;
1987
1988         result = thermal_set_governor(tz, governor);
1989         if (result) {
1990                 mutex_unlock(&thermal_governor_lock);
1991                 goto unregister;
1992         }
1993
1994         mutex_unlock(&thermal_governor_lock);
1995
1996         if (!tz->tzp || !tz->tzp->no_hwmon) {
1997                 result = thermal_add_hwmon_sysfs(tz);
1998                 if (result)
1999                         goto unregister;
2000         }
2001
2002         mutex_lock(&thermal_list_lock);
2003         list_add_tail(&tz->node, &thermal_tz_list);
2004         mutex_unlock(&thermal_list_lock);
2005
2006         /* Bind cooling devices for this zone */
2007         bind_tz(tz);
2008
2009         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
2010
2011         thermal_zone_device_reset(tz);
2012         /* Update the new thermal zone and mark it as already updated. */
2013         if (atomic_cmpxchg(&tz->need_update, 1, 0))
2014                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
2015
2016         return tz;
2017
2018 unregister:
2019         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2020         device_unregister(&tz->device);
2021         return ERR_PTR(result);
2022 }
2023 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
2024
2025 /**
2026  * thermal_device_unregister - removes the registered thermal zone device
2027  * @tz: the thermal zone device to remove
2028  */
2029 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
2030 {
2031         int i;
2032         const struct thermal_zone_params *tzp;
2033         struct thermal_cooling_device *cdev;
2034         struct thermal_zone_device *pos = NULL;
2035
2036         if (!tz)
2037                 return;
2038
2039         tzp = tz->tzp;
2040
2041         mutex_lock(&thermal_list_lock);
2042         list_for_each_entry(pos, &thermal_tz_list, node)
2043             if (pos == tz)
2044                 break;
2045         if (pos != tz) {
2046                 /* thermal zone device not found */
2047                 mutex_unlock(&thermal_list_lock);
2048                 return;
2049         }
2050         list_del(&tz->node);
2051
2052         /* Unbind all cdevs associated with 'this' thermal zone */
2053         list_for_each_entry(cdev, &thermal_cdev_list, node) {
2054                 if (tz->ops->unbind) {
2055                         tz->ops->unbind(tz, cdev);
2056                         continue;
2057                 }
2058
2059                 if (!tzp || !tzp->tbp)
2060                         break;
2061
2062                 for (i = 0; i < tzp->num_tbps; i++) {
2063                         if (tzp->tbp[i].cdev == cdev) {
2064                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
2065                                 tzp->tbp[i].cdev = NULL;
2066                         }
2067                 }
2068         }
2069
2070         mutex_unlock(&thermal_list_lock);
2071
2072         thermal_zone_device_set_polling(tz, 0);
2073
2074         if (tz->type[0])
2075                 device_remove_file(&tz->device, &dev_attr_type);
2076         device_remove_file(&tz->device, &dev_attr_temp);
2077         if (tz->ops->get_mode)
2078                 device_remove_file(&tz->device, &dev_attr_mode);
2079         device_remove_file(&tz->device, &dev_attr_policy);
2080         device_remove_file(&tz->device, &dev_attr_available_policies);
2081         remove_trip_attrs(tz);
2082         thermal_set_governor(tz, NULL);
2083
2084         thermal_remove_hwmon_sysfs(tz);
2085         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2086         idr_destroy(&tz->idr);
2087         mutex_destroy(&tz->lock);
2088         device_unregister(&tz->device);
2089         return;
2090 }
2091 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2092
2093 /**
2094  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2095  * @name: thermal zone name to fetch the temperature
2096  *
2097  * When only one zone is found with the passed name, returns a reference to it.
2098  *
2099  * Return: On success returns a reference to an unique thermal zone with
2100  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2101  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2102  */
2103 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2104 {
2105         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2106         unsigned int found = 0;
2107
2108         if (!name)
2109                 goto exit;
2110
2111         mutex_lock(&thermal_list_lock);
2112         list_for_each_entry(pos, &thermal_tz_list, node)
2113                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2114                         found++;
2115                         ref = pos;
2116                 }
2117         mutex_unlock(&thermal_list_lock);
2118
2119         /* nothing has been found, thus an error code for it */
2120         if (found == 0)
2121                 ref = ERR_PTR(-ENODEV);
2122         else if (found > 1)
2123         /* Success only when an unique zone is found */
2124                 ref = ERR_PTR(-EEXIST);
2125
2126 exit:
2127         return ref;
2128 }
2129 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2130
2131 /**
2132  * thermal_zone_get_slope - return the slope attribute of the thermal zone
2133  * @tz: thermal zone device with the slope attribute
2134  *
2135  * Return: If the thermal zone device has a slope attribute, return it, else
2136  * return 1.
2137  */
2138 int thermal_zone_get_slope(struct thermal_zone_device *tz)
2139 {
2140         if (tz && tz->tzp)
2141                 return tz->tzp->slope;
2142         return 1;
2143 }
2144 EXPORT_SYMBOL_GPL(thermal_zone_get_slope);
2145
2146 /**
2147  * thermal_zone_get_offset - return the offset attribute of the thermal zone
2148  * @tz: thermal zone device with the offset attribute
2149  *
2150  * Return: If the thermal zone device has a offset attribute, return it, else
2151  * return 0.
2152  */
2153 int thermal_zone_get_offset(struct thermal_zone_device *tz)
2154 {
2155         if (tz && tz->tzp)
2156                 return tz->tzp->offset;
2157         return 0;
2158 }
2159 EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
2160
2161 #ifdef CONFIG_NET
2162 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2163         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2164 };
2165
2166 static struct genl_family thermal_event_genl_family = {
2167         .id = GENL_ID_GENERATE,
2168         .name = THERMAL_GENL_FAMILY_NAME,
2169         .version = THERMAL_GENL_VERSION,
2170         .maxattr = THERMAL_GENL_ATTR_MAX,
2171         .mcgrps = thermal_event_mcgrps,
2172         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2173 };
2174
2175 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2176                                         enum events event)
2177 {
2178         struct sk_buff *skb;
2179         struct nlattr *attr;
2180         struct thermal_genl_event *thermal_event;
2181         void *msg_header;
2182         int size;
2183         int result;
2184         static unsigned int thermal_event_seqnum;
2185
2186         if (!tz)
2187                 return -EINVAL;
2188
2189         /* allocate memory */
2190         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2191                nla_total_size(0);
2192
2193         skb = genlmsg_new(size, GFP_ATOMIC);
2194         if (!skb)
2195                 return -ENOMEM;
2196
2197         /* add the genetlink message header */
2198         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2199                                  &thermal_event_genl_family, 0,
2200                                  THERMAL_GENL_CMD_EVENT);
2201         if (!msg_header) {
2202                 nlmsg_free(skb);
2203                 return -ENOMEM;
2204         }
2205
2206         /* fill the data */
2207         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2208                            sizeof(struct thermal_genl_event));
2209
2210         if (!attr) {
2211                 nlmsg_free(skb);
2212                 return -EINVAL;
2213         }
2214
2215         thermal_event = nla_data(attr);
2216         if (!thermal_event) {
2217                 nlmsg_free(skb);
2218                 return -EINVAL;
2219         }
2220
2221         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2222
2223         thermal_event->orig = tz->id;
2224         thermal_event->event = event;
2225
2226         /* send multicast genetlink message */
2227         genlmsg_end(skb, msg_header);
2228
2229         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2230                                    0, GFP_ATOMIC);
2231         if (result)
2232                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2233
2234         return result;
2235 }
2236 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2237
2238 static int genetlink_init(void)
2239 {
2240         return genl_register_family(&thermal_event_genl_family);
2241 }
2242
2243 static void genetlink_exit(void)
2244 {
2245         genl_unregister_family(&thermal_event_genl_family);
2246 }
2247 #else /* !CONFIG_NET */
2248 static inline int genetlink_init(void) { return 0; }
2249 static inline void genetlink_exit(void) {}
2250 #endif /* !CONFIG_NET */
2251
2252 static int __init thermal_register_governors(void)
2253 {
2254         int result;
2255
2256         result = thermal_gov_step_wise_register();
2257         if (result)
2258                 return result;
2259
2260         result = thermal_gov_fair_share_register();
2261         if (result)
2262                 return result;
2263
2264         result = thermal_gov_bang_bang_register();
2265         if (result)
2266                 return result;
2267
2268         result = thermal_gov_user_space_register();
2269         if (result)
2270                 return result;
2271
2272         return thermal_gov_power_allocator_register();
2273 }
2274
2275 static void thermal_unregister_governors(void)
2276 {
2277         thermal_gov_step_wise_unregister();
2278         thermal_gov_fair_share_unregister();
2279         thermal_gov_bang_bang_unregister();
2280         thermal_gov_user_space_unregister();
2281         thermal_gov_power_allocator_unregister();
2282 }
2283
2284 static int thermal_pm_notify(struct notifier_block *nb,
2285                                 unsigned long mode, void *_unused)
2286 {
2287         struct thermal_zone_device *tz;
2288
2289         switch (mode) {
2290         case PM_HIBERNATION_PREPARE:
2291         case PM_RESTORE_PREPARE:
2292         case PM_SUSPEND_PREPARE:
2293                 atomic_set(&in_suspend, 1);
2294                 break;
2295         case PM_POST_HIBERNATION:
2296         case PM_POST_RESTORE:
2297         case PM_POST_SUSPEND:
2298                 atomic_set(&in_suspend, 0);
2299                 list_for_each_entry(tz, &thermal_tz_list, node) {
2300                         thermal_zone_device_reset(tz);
2301                         thermal_zone_device_update(tz,
2302                                                    THERMAL_EVENT_UNSPECIFIED);
2303                 }
2304                 break;
2305         default:
2306                 break;
2307         }
2308         return 0;
2309 }
2310
2311 static struct notifier_block thermal_pm_nb = {
2312         .notifier_call = thermal_pm_notify,
2313 };
2314
2315 static int __init thermal_init(void)
2316 {
2317         int result;
2318
2319         result = thermal_register_governors();
2320         if (result)
2321                 goto error;
2322
2323         result = class_register(&thermal_class);
2324         if (result)
2325                 goto unregister_governors;
2326
2327         result = genetlink_init();
2328         if (result)
2329                 goto unregister_class;
2330
2331         result = of_parse_thermal_zones();
2332         if (result)
2333                 goto exit_netlink;
2334
2335         result = register_pm_notifier(&thermal_pm_nb);
2336         if (result)
2337                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2338                         result);
2339
2340         return 0;
2341
2342 exit_netlink:
2343         genetlink_exit();
2344 unregister_class:
2345         class_unregister(&thermal_class);
2346 unregister_governors:
2347         thermal_unregister_governors();
2348 error:
2349         idr_destroy(&thermal_tz_idr);
2350         idr_destroy(&thermal_cdev_idr);
2351         mutex_destroy(&thermal_idr_lock);
2352         mutex_destroy(&thermal_list_lock);
2353         mutex_destroy(&thermal_governor_lock);
2354         return result;
2355 }
2356
2357 static void __exit thermal_exit(void)
2358 {
2359         unregister_pm_notifier(&thermal_pm_nb);
2360         of_thermal_destroy_zones();
2361         genetlink_exit();
2362         class_unregister(&thermal_class);
2363         thermal_unregister_governors();
2364         idr_destroy(&thermal_tz_idr);
2365         idr_destroy(&thermal_cdev_idr);
2366         mutex_destroy(&thermal_idr_lock);
2367         mutex_destroy(&thermal_list_lock);
2368         mutex_destroy(&thermal_governor_lock);
2369 }
2370
2371 fs_initcall(thermal_init);
2372 module_exit(thermal_exit);