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_init(struct thermal_zone_device *tz)
 601 {
 602         struct thermal_instance *pos;
 603         tz->temperature = THERMAL_TEMP_INVALID;
 604         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 605                 pos->initialized = false;
 606 }
 607
 608 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 609 {
 610         tz->passive = 0;
 611         thermal_zone_device_init(tz);
 612 }
 613
 614 void thermal_zone_device_update(struct thermal_zone_device *tz,
 615                                 enum thermal_notify_event event)
 616 {
 617         int count;
 618
 619         if (atomic_read(&in_suspend))
 620                 return;
 621
 622         if (!tz->ops->get_temp)
 623                 return;
 624
 625         update_temperature(tz);
 626
 627         thermal_zone_set_trips(tz);
 628
 629         tz->notify_event = event;
 630
 631         for (count = 0; count < tz->trips; count++)
 632                 handle_thermal_trip(tz, count);
 633 }
 634 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 635
 636 static void thermal_zone_device_check(struct work_struct *work)
 637 {
 638         struct thermal_zone_device *tz = container_of(work, struct
 639                                                       thermal_zone_device,
 640                                                       poll_queue.work);
 641         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 642 }
 643
 644 /* sys I/F for thermal zone */
 645
 646 #define to_thermal_zone(_dev) \
 647         container_of(_dev, struct thermal_zone_device, device)
 648
 649 static ssize_t
 650 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 651 {
 652         struct thermal_zone_device *tz = to_thermal_zone(dev);
 653
 654         return sprintf(buf, "%s\n", tz->type);
 655 }
 656
 657 static ssize_t
 658 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 659 {
 660         struct thermal_zone_device *tz = to_thermal_zone(dev);
 661         int temperature, ret;
 662
 663         ret = thermal_zone_get_temp(tz, &temperature);
 664
 665         if (ret)
 666                 return ret;
 667
 668         return sprintf(buf, "%d\n", temperature);
 669 }
 670
 671 static ssize_t
 672 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 673 {
 674         struct thermal_zone_device *tz = to_thermal_zone(dev);
 675         enum thermal_device_mode mode;
 676         int result;
 677
 678         if (!tz->ops->get_mode)
 679                 return -EPERM;
 680
 681         result = tz->ops->get_mode(tz, &mode);
 682         if (result)
 683                 return result;
 684
 685         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 686                        : "disabled");
 687 }
 688
 689 static ssize_t
 690 mode_store(struct device *dev, struct device_attribute *attr,
 691            const char *buf, size_t count)
 692 {
 693         struct thermal_zone_device *tz = to_thermal_zone(dev);
 694         int result;
 695
 696         if (!tz->ops->set_mode)
 697                 return -EPERM;
 698
 699         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 700                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 701         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 702                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 703         else
 704                 result = -EINVAL;
 705
 706         if (result)
 707                 return result;
 708
 709         return count;
 710 }
 711
 712 static ssize_t
 713 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 714                      char *buf)
 715 {
 716         struct thermal_zone_device *tz = to_thermal_zone(dev);
 717         enum thermal_trip_type type;
 718         int trip, result;
 719
 720         if (!tz->ops->get_trip_type)
 721                 return -EPERM;
 722
 723         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 724                 return -EINVAL;
 725
 726         result = tz->ops->get_trip_type(tz, trip, &type);
 727         if (result)
 728                 return result;
 729
 730         switch (type) {
 731         case THERMAL_TRIP_CRITICAL:
 732                 return sprintf(buf, "critical\n");
 733         case THERMAL_TRIP_HOT:
 734                 return sprintf(buf, "hot\n");
 735         case THERMAL_TRIP_PASSIVE:
 736                 return sprintf(buf, "passive\n");
 737         case THERMAL_TRIP_ACTIVE:
 738                 return sprintf(buf, "active\n");
 739         default:
 740                 return sprintf(buf, "unknown\n");
 741         }
 742 }
 743
 744 static ssize_t
 745 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 746                      const char *buf, size_t count)
 747 {
 748         struct thermal_zone_device *tz = to_thermal_zone(dev);
 749         int trip, ret;
 750         int temperature;
 751
 752         if (!tz->ops->set_trip_temp)
 753                 return -EPERM;
 754
 755         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 756                 return -EINVAL;
 757
 758         if (kstrtoint(buf, 10, &temperature))
 759                 return -EINVAL;
 760
 761         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 762         if (ret)
 763                 return ret;
 764
 765         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 766
 767         return count;
 768 }
 769
 770 static ssize_t
 771 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 772                      char *buf)
 773 {
 774         struct thermal_zone_device *tz = to_thermal_zone(dev);
 775         int trip, ret;
 776         int temperature;
 777
 778         if (!tz->ops->get_trip_temp)
 779                 return -EPERM;
 780
 781         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 782                 return -EINVAL;
 783
 784         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 785
 786         if (ret)
 787                 return ret;
 788
 789         return sprintf(buf, "%d\n", temperature);
 790 }
 791
 792 static ssize_t
 793 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 794                         const char *buf, size_t count)
 795 {
 796         struct thermal_zone_device *tz = to_thermal_zone(dev);
 797         int trip, ret;
 798         int temperature;
 799
 800         if (!tz->ops->set_trip_hyst)
 801                 return -EPERM;
 802
 803         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 804                 return -EINVAL;
 805
 806         if (kstrtoint(buf, 10, &temperature))
 807                 return -EINVAL;
 808
 809         /*
 810          * We are not doing any check on the 'temperature' value
 811          * here. The driver implementing 'set_trip_hyst' has to
 812          * take care of this.
 813          */
 814         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 815
 816         if (!ret)
 817                 thermal_zone_set_trips(tz);
 818
 819         return ret ? ret : count;
 820 }
 821
 822 static ssize_t
 823 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 824                         char *buf)
 825 {
 826         struct thermal_zone_device *tz = to_thermal_zone(dev);
 827         int trip, ret;
 828         int temperature;
 829
 830         if (!tz->ops->get_trip_hyst)
 831                 return -EPERM;
 832
 833         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 834                 return -EINVAL;
 835
 836         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 837
 838         return ret ? ret : sprintf(buf, "%d\n", temperature);
 839 }
 840
 841 static ssize_t
 842 passive_store(struct device *dev, struct device_attribute *attr,
 843                     const char *buf, size_t count)
 844 {
 845         struct thermal_zone_device *tz = to_thermal_zone(dev);
 846         struct thermal_cooling_device *cdev = NULL;
 847         int state;
 848
 849         if (!sscanf(buf, "%d\n", &state))
 850                 return -EINVAL;
 851
 852         /* sanity check: values below 1000 millicelcius don't make sense
 853          * and can cause the system to go into a thermal heart attack
 854          */
 855         if (state && state < 1000)
 856                 return -EINVAL;
 857
 858         if (state && !tz->forced_passive) {
 859                 mutex_lock(&thermal_list_lock);
 860                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 861                         if (!strncmp("Processor", cdev->type,
 862                                      sizeof("Processor")))
 863                                 thermal_zone_bind_cooling_device(tz,
 864                                                 THERMAL_TRIPS_NONE, cdev,
 865                                                 THERMAL_NO_LIMIT,
 866                                                 THERMAL_NO_LIMIT,
 867                                                 THERMAL_WEIGHT_DEFAULT);
 868                 }
 869                 mutex_unlock(&thermal_list_lock);
 870                 if (!tz->passive_delay)
 871                         tz->passive_delay = 1000;
 872         } else if (!state && tz->forced_passive) {
 873                 mutex_lock(&thermal_list_lock);
 874                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 875                         if (!strncmp("Processor", cdev->type,
 876                                      sizeof("Processor")))
 877                                 thermal_zone_unbind_cooling_device(tz,
 878                                                                    THERMAL_TRIPS_NONE,
 879                                                                    cdev);
 880                 }
 881                 mutex_unlock(&thermal_list_lock);
 882                 tz->passive_delay = 0;
 883         }
 884
 885         tz->forced_passive = state;
 886
 887         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 888
 889         return count;
 890 }
 891
 892 static ssize_t
 893 passive_show(struct device *dev, struct device_attribute *attr,
 894                    char *buf)
 895 {
 896         struct thermal_zone_device *tz = to_thermal_zone(dev);
 897
 898         return sprintf(buf, "%d\n", tz->forced_passive);
 899 }
 900
 901 static ssize_t
 902 policy_store(struct device *dev, struct device_attribute *attr,
 903                     const char *buf, size_t count)
 904 {
 905         int ret = -EINVAL;
 906         struct thermal_zone_device *tz = to_thermal_zone(dev);
 907         struct thermal_governor *gov;
 908         char name[THERMAL_NAME_LENGTH];
 909
 910         snprintf(name, sizeof(name), "%s", buf);
 911
 912         mutex_lock(&thermal_governor_lock);
 913         mutex_lock(&tz->lock);
 914
 915         gov = __find_governor(strim(name));
 916         if (!gov)
 917                 goto exit;
 918
 919         ret = thermal_set_governor(tz, gov);
 920         if (!ret)
 921                 ret = count;
 922
 923 exit:
 924         mutex_unlock(&tz->lock);
 925         mutex_unlock(&thermal_governor_lock);
 926         return ret;
 927 }
 928
 929 static ssize_t
 930 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 931 {
 932         struct thermal_zone_device *tz = to_thermal_zone(dev);
 933
 934         return sprintf(buf, "%s\n", tz->governor->name);
 935 }
 936
 937 static ssize_t
 938 available_policies_show(struct device *dev, struct device_attribute *devattr,
 939                         char *buf)
 940 {
 941         struct thermal_governor *pos;
 942         ssize_t count = 0;
 943         ssize_t size = PAGE_SIZE;
 944
 945         mutex_lock(&thermal_governor_lock);
 946
 947         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 948                 size = PAGE_SIZE - count;
 949                 count += scnprintf(buf + count, size, "%s ", pos->name);
 950         }
 951         count += scnprintf(buf + count, size, "\n");
 952
 953         mutex_unlock(&thermal_governor_lock);
 954
 955         return count;
 956 }
 957
 958 static ssize_t
 959 emul_temp_store(struct device *dev, struct device_attribute *attr,
 960                      const char *buf, size_t count)
 961 {
 962         struct thermal_zone_device *tz = to_thermal_zone(dev);
 963         int ret = 0;
 964         int temperature;
 965
 966         if (kstrtoint(buf, 10, &temperature))
 967                 return -EINVAL;
 968
 969         if (!tz->ops->set_emul_temp) {
 970                 mutex_lock(&tz->lock);
 971                 tz->emul_temperature = temperature;
 972                 mutex_unlock(&tz->lock);
 973         } else {
 974                 ret = tz->ops->set_emul_temp(tz, temperature);
 975         }
 976
 977         if (!ret)
 978                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 979
 980         return ret ? ret : count;
 981 }
 982 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 983
 984 static ssize_t
 985 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 986                        char *buf)
 987 {
 988         struct thermal_zone_device *tz = to_thermal_zone(dev);
 989
 990         if (tz->tzp)
 991                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 992         else
 993                 return -EIO;
 994 }
 995
 996 static ssize_t
 997 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 998                         const char *buf, size_t count)
 999 {
1000         struct thermal_zone_device *tz = to_thermal_zone(dev);
1001         u32 sustainable_power;
1002
1003         if (!tz->tzp)
1004                 return -EIO;
1005
1006         if (kstrtou32(buf, 10, &sustainable_power))
1007                 return -EINVAL;
1008
1009         tz->tzp->sustainable_power = sustainable_power;
1010
1011         return count;
1012 }
1013 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
1014                 sustainable_power_store);
1015
1016 #define create_s32_tzp_attr(name)                                       \
1017         static ssize_t                                                  \
1018         name##_show(struct device *dev, struct device_attribute *devattr, \
1019                 char *buf)                                              \
1020         {                                                               \
1021         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
1022                                                                         \
1023         if (tz->tzp)                                                    \
1024                 return sprintf(buf, "%d\n", tz->tzp->name);             \
1025         else                                                            \
1026                 return -EIO;                                            \
1027         }                                                               \
1028                                                                         \
1029         static ssize_t                                                  \
1030         name##_store(struct device *dev, struct device_attribute *devattr, \
1031                 const char *buf, size_t count)                          \
1032         {                                                               \
1033                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
1034                 s32 value;                                              \
1035                                                                         \
1036                 if (!tz->tzp)                                           \
1037                         return -EIO;                                    \
1038                                                                         \
1039                 if (kstrtos32(buf, 10, &value))                         \
1040                         return -EINVAL;                                 \
1041                                                                         \
1042                 tz->tzp->name = value;                                  \
1043                                                                         \
1044                 return count;                                           \
1045         }                                                               \
1046         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
1047
1048 create_s32_tzp_attr(k_po);
1049 create_s32_tzp_attr(k_pu);
1050 create_s32_tzp_attr(k_i);
1051 create_s32_tzp_attr(k_d);
1052 create_s32_tzp_attr(integral_cutoff);
1053 create_s32_tzp_attr(slope);
1054 create_s32_tzp_attr(offset);
1055 #undef create_s32_tzp_attr
1056
1057 static struct device_attribute *dev_tzp_attrs[] = {
1058         &dev_attr_sustainable_power,
1059         &dev_attr_k_po,
1060         &dev_attr_k_pu,
1061         &dev_attr_k_i,
1062         &dev_attr_k_d,
1063         &dev_attr_integral_cutoff,
1064         &dev_attr_slope,
1065         &dev_attr_offset,
1066 };
1067
1068 static int create_tzp_attrs(struct device *dev)
1069 {
1070         int i;
1071
1072         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1073                 int ret;
1074                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1075
1076                 ret = device_create_file(dev, dev_attr);
1077                 if (ret)
1078                         return ret;
1079         }
1080
1081         return 0;
1082 }
1083
1084 /**
1085  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1086  * @cdev:       pointer to &thermal_cooling_device
1087  * @tz:         a valid thermal zone device pointer
1088  * @max_power:  pointer in which to store the maximum power
1089  *
1090  * Calculate the maximum power consumption in milliwats that the
1091  * cooling device can currently consume and store it in @max_power.
1092  *
1093  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1094  * power_actor API or -E* on other error.
1095  */
1096 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1097                               struct thermal_zone_device *tz, u32 *max_power)
1098 {
1099         if (!cdev_is_power_actor(cdev))
1100                 return -EINVAL;
1101
1102         return cdev->ops->state2power(cdev, tz, 0, max_power);
1103 }
1104
1105 /**
1106  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1107  * @cdev:       pointer to &thermal_cooling_device
1108  * @tz:         a valid thermal zone device pointer
1109  * @min_power:  pointer in which to store the minimum power
1110  *
1111  * Calculate the minimum power consumption in milliwatts that the
1112  * cooling device can currently consume and store it in @min_power.
1113  *
1114  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1115  * power_actor API or -E* on other error.
1116  */
1117 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1118                               struct thermal_zone_device *tz, u32 *min_power)
1119 {
1120         unsigned long max_state;
1121         int ret;
1122
1123         if (!cdev_is_power_actor(cdev))
1124                 return -EINVAL;
1125
1126         ret = cdev->ops->get_max_state(cdev, &max_state);
1127         if (ret)
1128                 return ret;
1129
1130         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1131 }
1132
1133 /**
1134  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1135  * @cdev:       pointer to &thermal_cooling_device
1136  * @instance:   thermal instance to update
1137  * @power:      the power in milliwatts
1138  *
1139  * Set the cooling device to consume at most @power milliwatts.
1140  *
1141  * Return: 0 on success, -EINVAL if the cooling device does not
1142  * implement the power actor API or -E* for other failures.
1143  */
1144 int power_actor_set_power(struct thermal_cooling_device *cdev,
1145                           struct thermal_instance *instance, u32 power)
1146 {
1147         unsigned long state;
1148         int ret;
1149
1150         if (!cdev_is_power_actor(cdev))
1151                 return -EINVAL;
1152
1153         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1154         if (ret)
1155                 return ret;
1156
1157         instance->target = state;
1158         mutex_lock(&cdev->lock);
1159         cdev->updated = false;
1160         mutex_unlock(&cdev->lock);
1161         thermal_cdev_update(cdev);
1162
1163         return 0;
1164 }
1165
1166 static DEVICE_ATTR(type, 0444, type_show, NULL);
1167 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1168 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1169 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1170 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1171 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1172
1173 /* sys I/F for cooling device */
1174 #define to_cooling_device(_dev) \
1175         container_of(_dev, struct thermal_cooling_device, device)
1176
1177 static ssize_t
1178 thermal_cooling_device_type_show(struct device *dev,
1179                                  struct device_attribute *attr, char *buf)
1180 {
1181         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1182
1183         return sprintf(buf, "%s\n", cdev->type);
1184 }
1185
1186 static ssize_t
1187 thermal_cooling_device_max_state_show(struct device *dev,
1188                                       struct device_attribute *attr, char *buf)
1189 {
1190         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1191         unsigned long state;
1192         int ret;
1193
1194         ret = cdev->ops->get_max_state(cdev, &state);
1195         if (ret)
1196                 return ret;
1197         return sprintf(buf, "%ld\n", state);
1198 }
1199
1200 static ssize_t
1201 thermal_cooling_device_cur_state_show(struct device *dev,
1202                                       struct device_attribute *attr, char *buf)
1203 {
1204         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1205         unsigned long state;
1206         int ret;
1207
1208         ret = cdev->ops->get_cur_state(cdev, &state);
1209         if (ret)
1210                 return ret;
1211         return sprintf(buf, "%ld\n", state);
1212 }
1213
1214 static ssize_t
1215 thermal_cooling_device_cur_state_store(struct device *dev,
1216                                        struct device_attribute *attr,
1217                                        const char *buf, size_t count)
1218 {
1219         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1220         unsigned long state;
1221         int result;
1222
1223         if (!sscanf(buf, "%ld\n", &state))
1224                 return -EINVAL;
1225
1226         if ((long)state < 0)
1227                 return -EINVAL;
1228
1229         result = cdev->ops->set_cur_state(cdev, state);
1230         if (result)
1231                 return result;
1232         return count;
1233 }
1234
1235 static struct device_attribute dev_attr_cdev_type =
1236 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1237 static DEVICE_ATTR(max_state, 0444,
1238                    thermal_cooling_device_max_state_show, NULL);
1239 static DEVICE_ATTR(cur_state, 0644,
1240                    thermal_cooling_device_cur_state_show,
1241                    thermal_cooling_device_cur_state_store);
1242
1243 static ssize_t
1244 thermal_cooling_device_trip_point_show(struct device *dev,
1245                                        struct device_attribute *attr, char *buf)
1246 {
1247         struct thermal_instance *instance;
1248
1249         instance =
1250             container_of(attr, struct thermal_instance, attr);
1251
1252         if (instance->trip == THERMAL_TRIPS_NONE)
1253                 return sprintf(buf, "-1\n");
1254         else
1255                 return sprintf(buf, "%d\n", instance->trip);
1256 }
1257
1258 static struct attribute *cooling_device_attrs[] = {
1259         &dev_attr_cdev_type.attr,
1260         &dev_attr_max_state.attr,
1261         &dev_attr_cur_state.attr,
1262         NULL,
1263 };
1264
1265 static const struct attribute_group cooling_device_attr_group = {
1266         .attrs = cooling_device_attrs,
1267 };
1268
1269 static const struct attribute_group *cooling_device_attr_groups[] = {
1270         &cooling_device_attr_group,
1271         NULL,
1272 };
1273
1274 static ssize_t
1275 thermal_cooling_device_weight_show(struct device *dev,
1276                                    struct device_attribute *attr, char *buf)
1277 {
1278         struct thermal_instance *instance;
1279
1280         instance = container_of(attr, struct thermal_instance, weight_attr);
1281
1282         return sprintf(buf, "%d\n", instance->weight);
1283 }
1284
1285 static ssize_t
1286 thermal_cooling_device_weight_store(struct device *dev,
1287                                     struct device_attribute *attr,
1288                                     const char *buf, size_t count)
1289 {
1290         struct thermal_instance *instance;
1291         int ret, weight;
1292
1293         ret = kstrtoint(buf, 0, &weight);
1294         if (ret)
1295                 return ret;
1296
1297         instance = container_of(attr, struct thermal_instance, weight_attr);
1298         instance->weight = weight;
1299
1300         return count;
1301 }
1302 /* Device management */
1303
1304 /**
1305  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1306  * @tz:         pointer to struct thermal_zone_device
1307  * @trip:       indicates which trip point the cooling devices is
1308  *              associated with in this thermal zone.
1309  * @cdev:       pointer to struct thermal_cooling_device
1310  * @upper:      the Maximum cooling state for this trip point.
1311  *              THERMAL_NO_LIMIT means no upper limit,
1312  *              and the cooling device can be in max_state.
1313  * @lower:      the Minimum cooling state can be used for this trip point.
1314  *              THERMAL_NO_LIMIT means no lower limit,
1315  *              and the cooling device can be in cooling state 0.
1316  * @weight:     The weight of the cooling device to be bound to the
1317  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1318  *              default value
1319  *
1320  * This interface function bind a thermal cooling device to the certain trip
1321  * point of a thermal zone device.
1322  * This function is usually called in the thermal zone device .bind callback.
1323  *
1324  * Return: 0 on success, the proper error value otherwise.
1325  */
1326 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1327                                      int trip,
1328                                      struct thermal_cooling_device *cdev,
1329                                      unsigned long upper, unsigned long lower,
1330                                      unsigned int weight)
1331 {
1332         struct thermal_instance *dev;
1333         struct thermal_instance *pos;
1334         struct thermal_zone_device *pos1;
1335         struct thermal_cooling_device *pos2;
1336         unsigned long max_state;
1337         int result, ret;
1338
1339         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1340                 return -EINVAL;
1341
1342         list_for_each_entry(pos1, &thermal_tz_list, node) {
1343                 if (pos1 == tz)
1344                         break;
1345         }
1346         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1347                 if (pos2 == cdev)
1348                         break;
1349         }
1350
1351         if (tz != pos1 || cdev != pos2)
1352                 return -EINVAL;
1353
1354         ret = cdev->ops->get_max_state(cdev, &max_state);
1355         if (ret)
1356                 return ret;
1357
1358         /* lower default 0, upper default max_state */
1359         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1360         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1361
1362         if (lower > upper || upper > max_state)
1363                 return -EINVAL;
1364
1365         dev =
1366             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1367         if (!dev)
1368                 return -ENOMEM;
1369         dev->tz = tz;
1370         dev->cdev = cdev;
1371         dev->trip = trip;
1372         dev->upper = upper;
1373         dev->lower = lower;
1374         dev->target = THERMAL_NO_TARGET;
1375         dev->weight = weight;
1376
1377         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1378         if (result)
1379                 goto free_mem;
1380
1381         sprintf(dev->name, "cdev%d", dev->id);
1382         result =
1383             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1384         if (result)
1385                 goto release_idr;
1386
1387         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1388         sysfs_attr_init(&dev->attr.attr);
1389         dev->attr.attr.name = dev->attr_name;
1390         dev->attr.attr.mode = 0444;
1391         dev->attr.show = thermal_cooling_device_trip_point_show;
1392         result = device_create_file(&tz->device, &dev->attr);
1393         if (result)
1394                 goto remove_symbol_link;
1395
1396         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1397         sysfs_attr_init(&dev->weight_attr.attr);
1398         dev->weight_attr.attr.name = dev->weight_attr_name;
1399         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1400         dev->weight_attr.show = thermal_cooling_device_weight_show;
1401         dev->weight_attr.store = thermal_cooling_device_weight_store;
1402         result = device_create_file(&tz->device, &dev->weight_attr);
1403         if (result)
1404                 goto remove_trip_file;
1405
1406         mutex_lock(&tz->lock);
1407         mutex_lock(&cdev->lock);
1408         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1409             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1410                 result = -EEXIST;
1411                 break;
1412         }
1413         if (!result) {
1414                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1415                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1416                 atomic_set(&tz->need_update, 1);
1417         }
1418         mutex_unlock(&cdev->lock);
1419         mutex_unlock(&tz->lock);
1420
1421         if (!result)
1422                 return 0;
1423
1424         device_remove_file(&tz->device, &dev->weight_attr);
1425 remove_trip_file:
1426         device_remove_file(&tz->device, &dev->attr);
1427 remove_symbol_link:
1428         sysfs_remove_link(&tz->device.kobj, dev->name);
1429 release_idr:
1430         release_idr(&tz->idr, &tz->lock, dev->id);
1431 free_mem:
1432         kfree(dev);
1433         return result;
1434 }
1435 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1436
1437 /**
1438  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1439  *                                        thermal zone.
1440  * @tz:         pointer to a struct thermal_zone_device.
1441  * @trip:       indicates which trip point the cooling devices is
1442  *              associated with in this thermal zone.
1443  * @cdev:       pointer to a struct thermal_cooling_device.
1444  *
1445  * This interface function unbind a thermal cooling device from the certain
1446  * trip point of a thermal zone device.
1447  * This function is usually called in the thermal zone device .unbind callback.
1448  *
1449  * Return: 0 on success, the proper error value otherwise.
1450  */
1451 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1452                                        int trip,
1453                                        struct thermal_cooling_device *cdev)
1454 {
1455         struct thermal_instance *pos, *next;
1456
1457         mutex_lock(&tz->lock);
1458         mutex_lock(&cdev->lock);
1459         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1460                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1461                         list_del(&pos->tz_node);
1462                         list_del(&pos->cdev_node);
1463                         mutex_unlock(&cdev->lock);
1464                         mutex_unlock(&tz->lock);
1465                         goto unbind;
1466                 }
1467         }
1468         mutex_unlock(&cdev->lock);
1469         mutex_unlock(&tz->lock);
1470
1471         return -ENODEV;
1472
1473 unbind:
1474         device_remove_file(&tz->device, &pos->weight_attr);
1475         device_remove_file(&tz->device, &pos->attr);
1476         sysfs_remove_link(&tz->device.kobj, pos->name);
1477         release_idr(&tz->idr, &tz->lock, pos->id);
1478         kfree(pos);
1479         return 0;
1480 }
1481 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1482
1483 static void thermal_release(struct device *dev)
1484 {
1485         struct thermal_zone_device *tz;
1486         struct thermal_cooling_device *cdev;
1487
1488         if (!strncmp(dev_name(dev), "thermal_zone",
1489                      sizeof("thermal_zone") - 1)) {
1490                 tz = to_thermal_zone(dev);
1491                 kfree(tz);
1492         } else if(!strncmp(dev_name(dev), "cooling_device",
1493                         sizeof("cooling_device") - 1)){
1494                 cdev = to_cooling_device(dev);
1495                 kfree(cdev);
1496         }
1497 }
1498
1499 static struct class thermal_class = {
1500         .name = "thermal",
1501         .dev_release = thermal_release,
1502 };
1503
1504 /**
1505  * __thermal_cooling_device_register() - register a new thermal cooling device
1506  * @np:         a pointer to a device tree node.
1507  * @type:       the thermal cooling device type.
1508  * @devdata:    device private data.
1509  * @ops:                standard thermal cooling devices callbacks.
1510  *
1511  * This interface function adds a new thermal cooling device (fan/processor/...)
1512  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1513  * to all the thermal zone devices registered at the same time.
1514  * It also gives the opportunity to link the cooling device to a device tree
1515  * node, so that it can be bound to a thermal zone created out of device tree.
1516  *
1517  * Return: a pointer to the created struct thermal_cooling_device or an
1518  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1519  */
1520 static struct thermal_cooling_device *
1521 __thermal_cooling_device_register(struct device_node *np,
1522                                   char *type, void *devdata,
1523                                   const struct thermal_cooling_device_ops *ops)
1524 {
1525         struct thermal_cooling_device *cdev;
1526         struct thermal_zone_device *pos = NULL;
1527         int result;
1528
1529         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1530                 return ERR_PTR(-EINVAL);
1531
1532         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1533             !ops->set_cur_state)
1534                 return ERR_PTR(-EINVAL);
1535
1536         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1537         if (!cdev)
1538                 return ERR_PTR(-ENOMEM);
1539
1540         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1541         if (result) {
1542                 kfree(cdev);
1543                 return ERR_PTR(result);
1544         }
1545
1546         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1547         mutex_init(&cdev->lock);
1548         INIT_LIST_HEAD(&cdev->thermal_instances);
1549         cdev->np = np;
1550         cdev->ops = ops;
1551         cdev->updated = false;
1552         cdev->device.class = &thermal_class;
1553         cdev->device.groups = cooling_device_attr_groups;
1554         cdev->devdata = devdata;
1555         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1556         result = device_register(&cdev->device);
1557         if (result) {
1558                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1559                 kfree(cdev);
1560                 return ERR_PTR(result);
1561         }
1562
1563         /* Add 'this' new cdev to the global cdev list */
1564         mutex_lock(&thermal_list_lock);
1565         list_add(&cdev->node, &thermal_cdev_list);
1566         mutex_unlock(&thermal_list_lock);
1567
1568         /* Update binding information for 'this' new cdev */
1569         bind_cdev(cdev);
1570
1571         mutex_lock(&thermal_list_lock);
1572         list_for_each_entry(pos, &thermal_tz_list, node)
1573                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1574                         thermal_zone_device_update(pos,
1575                                                    THERMAL_EVENT_UNSPECIFIED);
1576         mutex_unlock(&thermal_list_lock);
1577
1578         return cdev;
1579 }
1580
1581 /**
1582  * thermal_cooling_device_register() - register a new thermal cooling device
1583  * @type:       the thermal cooling device type.
1584  * @devdata:    device private data.
1585  * @ops:                standard thermal cooling devices callbacks.
1586  *
1587  * This interface function adds a new thermal cooling device (fan/processor/...)
1588  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1589  * to all the thermal zone devices registered at the same time.
1590  *
1591  * Return: a pointer to the created struct thermal_cooling_device or an
1592  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1593  */
1594 struct thermal_cooling_device *
1595 thermal_cooling_device_register(char *type, void *devdata,
1596                                 const struct thermal_cooling_device_ops *ops)
1597 {
1598         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1599 }
1600 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1601
1602 /**
1603  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1604  * @np:         a pointer to a device tree node.
1605  * @type:       the thermal cooling device type.
1606  * @devdata:    device private data.
1607  * @ops:                standard thermal cooling devices callbacks.
1608  *
1609  * This function will register a cooling device with device tree node reference.
1610  * This interface function adds a new thermal cooling device (fan/processor/...)
1611  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1612  * to all the thermal zone devices registered at the same time.
1613  *
1614  * Return: a pointer to the created struct thermal_cooling_device or an
1615  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1616  */
1617 struct thermal_cooling_device *
1618 thermal_of_cooling_device_register(struct device_node *np,
1619                                    char *type, void *devdata,
1620                                    const struct thermal_cooling_device_ops *ops)
1621 {
1622         return __thermal_cooling_device_register(np, type, devdata, ops);
1623 }
1624 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1625
1626 /**
1627  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1628  * @cdev:       the thermal cooling device to remove.
1629  *
1630  * thermal_cooling_device_unregister() must be called when the device is no
1631  * longer needed.
1632  */
1633 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1634 {
1635         int i;
1636         const struct thermal_zone_params *tzp;
1637         struct thermal_zone_device *tz;
1638         struct thermal_cooling_device *pos = NULL;
1639
1640         if (!cdev)
1641                 return;
1642
1643         mutex_lock(&thermal_list_lock);
1644         list_for_each_entry(pos, &thermal_cdev_list, node)
1645             if (pos == cdev)
1646                 break;
1647         if (pos != cdev) {
1648                 /* thermal cooling device not found */
1649                 mutex_unlock(&thermal_list_lock);
1650                 return;
1651         }
1652         list_del(&cdev->node);
1653
1654         /* Unbind all thermal zones associated with 'this' cdev */
1655         list_for_each_entry(tz, &thermal_tz_list, node) {
1656                 if (tz->ops->unbind) {
1657                         tz->ops->unbind(tz, cdev);
1658                         continue;
1659                 }
1660
1661                 if (!tz->tzp || !tz->tzp->tbp)
1662                         continue;
1663
1664                 tzp = tz->tzp;
1665                 for (i = 0; i < tzp->num_tbps; i++) {
1666                         if (tzp->tbp[i].cdev == cdev) {
1667                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1668                                 tzp->tbp[i].cdev = NULL;
1669                         }
1670                 }
1671         }
1672
1673         mutex_unlock(&thermal_list_lock);
1674
1675         if (cdev->type[0])
1676                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1677         device_remove_file(&cdev->device, &dev_attr_max_state);
1678         device_remove_file(&cdev->device, &dev_attr_cur_state);
1679
1680         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1681         device_unregister(&cdev->device);
1682         return;
1683 }
1684 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1685
1686 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1687 {
1688         struct thermal_instance *instance;
1689         unsigned long target = 0;
1690
1691         mutex_lock(&cdev->lock);
1692         /* cooling device is updated*/
1693         if (cdev->updated) {
1694                 mutex_unlock(&cdev->lock);
1695                 return;
1696         }
1697
1698         /* Make sure cdev enters the deepest cooling state */
1699         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1700                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1701                                 instance->tz->id, instance->target);
1702                 if (instance->target == THERMAL_NO_TARGET)
1703                         continue;
1704                 if (instance->target > target)
1705                         target = instance->target;
1706         }
1707         cdev->ops->set_cur_state(cdev, target);
1708         cdev->updated = true;
1709         mutex_unlock(&cdev->lock);
1710         trace_cdev_update(cdev, target);
1711         dev_dbg(&cdev->device, "set to state %lu\n", target);
1712 }
1713 EXPORT_SYMBOL(thermal_cdev_update);
1714
1715 /**
1716  * thermal_notify_framework - Sensor drivers use this API to notify framework
1717  * @tz:         thermal zone device
1718  * @trip:       indicates which trip point has been crossed
1719  *
1720  * This function handles the trip events from sensor drivers. It starts
1721  * throttling the cooling devices according to the policy configured.
1722  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1723  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1724  * The throttling policy is based on the configured platform data; if no
1725  * platform data is provided, this uses the step_wise throttling policy.
1726  */
1727 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1728 {
1729         handle_thermal_trip(tz, trip);
1730 }
1731 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1732
1733 /**
1734  * create_trip_attrs() - create attributes for trip points
1735  * @tz:         the thermal zone device
1736  * @mask:       Writeable trip point bitmap.
1737  *
1738  * helper function to instantiate sysfs entries for every trip
1739  * point and its properties of a struct thermal_zone_device.
1740  *
1741  * Return: 0 on success, the proper error value otherwise.
1742  */
1743 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1744 {
1745         int indx;
1746         int size = sizeof(struct thermal_attr) * tz->trips;
1747
1748         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1749         if (!tz->trip_type_attrs)
1750                 return -ENOMEM;
1751
1752         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1753         if (!tz->trip_temp_attrs) {
1754                 kfree(tz->trip_type_attrs);
1755                 return -ENOMEM;
1756         }
1757
1758         if (tz->ops->get_trip_hyst) {
1759                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1760                 if (!tz->trip_hyst_attrs) {
1761                         kfree(tz->trip_type_attrs);
1762                         kfree(tz->trip_temp_attrs);
1763                         return -ENOMEM;
1764                 }
1765         }
1766
1767
1768         for (indx = 0; indx < tz->trips; indx++) {
1769                 /* create trip type attribute */
1770                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1771                          "trip_point_%d_type", indx);
1772
1773                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1774                 tz->trip_type_attrs[indx].attr.attr.name =
1775                                                 tz->trip_type_attrs[indx].name;
1776                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1777                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1778
1779                 device_create_file(&tz->device,
1780                                    &tz->trip_type_attrs[indx].attr);
1781
1782                 /* create trip temp attribute */
1783                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1784                          "trip_point_%d_temp", indx);
1785
1786                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1787                 tz->trip_temp_attrs[indx].attr.attr.name =
1788                                                 tz->trip_temp_attrs[indx].name;
1789                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1790                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1791                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1792                     mask & (1 << indx)) {
1793                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1794                         tz->trip_temp_attrs[indx].attr.store =
1795                                                         trip_point_temp_store;
1796                 }
1797
1798                 device_create_file(&tz->device,
1799                                    &tz->trip_temp_attrs[indx].attr);
1800
1801                 /* create Optional trip hyst attribute */
1802                 if (!tz->ops->get_trip_hyst)
1803                         continue;
1804                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1805                          "trip_point_%d_hyst", indx);
1806
1807                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1808                 tz->trip_hyst_attrs[indx].attr.attr.name =
1809                                         tz->trip_hyst_attrs[indx].name;
1810                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1811                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1812                 if (tz->ops->set_trip_hyst) {
1813                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1814                         tz->trip_hyst_attrs[indx].attr.store =
1815                                         trip_point_hyst_store;
1816                 }
1817
1818                 device_create_file(&tz->device,
1819                                    &tz->trip_hyst_attrs[indx].attr);
1820         }
1821         return 0;
1822 }
1823
1824 static void remove_trip_attrs(struct thermal_zone_device *tz)
1825 {
1826         int indx;
1827
1828         for (indx = 0; indx < tz->trips; indx++) {
1829                 device_remove_file(&tz->device,
1830                                    &tz->trip_type_attrs[indx].attr);
1831                 device_remove_file(&tz->device,
1832                                    &tz->trip_temp_attrs[indx].attr);
1833                 if (tz->ops->get_trip_hyst)
1834                         device_remove_file(&tz->device,
1835                                   &tz->trip_hyst_attrs[indx].attr);
1836         }
1837         kfree(tz->trip_type_attrs);
1838         kfree(tz->trip_temp_attrs);
1839         kfree(tz->trip_hyst_attrs);
1840 }
1841
1842 /**
1843  * thermal_zone_device_register() - register a new thermal zone device
1844  * @type:       the thermal zone device type
1845  * @trips:      the number of trip points the thermal zone support
1846  * @mask:       a bit string indicating the writeablility of trip points
1847  * @devdata:    private device data
1848  * @ops:        standard thermal zone device callbacks
1849  * @tzp:        thermal zone platform parameters
1850  * @passive_delay: number of milliseconds to wait between polls when
1851  *                 performing passive cooling
1852  * @polling_delay: number of milliseconds to wait between polls when checking
1853  *                 whether trip points have been crossed (0 for interrupt
1854  *                 driven systems)
1855  *
1856  * This interface function adds a new thermal zone device (sensor) to
1857  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1858  * thermal cooling devices registered at the same time.
1859  * thermal_zone_device_unregister() must be called when the device is no
1860  * longer needed. The passive cooling depends on the .get_trend() return value.
1861  *
1862  * Return: a pointer to the created struct thermal_zone_device or an
1863  * in case of error, an ERR_PTR. Caller must check return value with
1864  * IS_ERR*() helpers.
1865  */
1866 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1867         int trips, int mask, void *devdata,
1868         struct thermal_zone_device_ops *ops,
1869         struct thermal_zone_params *tzp,
1870         int passive_delay, int polling_delay)
1871 {
1872         struct thermal_zone_device *tz;
1873         enum thermal_trip_type trip_type;
1874         int trip_temp;
1875         int result;
1876         int count;
1877         int passive = 0;
1878         struct thermal_governor *governor;
1879
1880         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1881                 return ERR_PTR(-EINVAL);
1882
1883         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1884                 return ERR_PTR(-EINVAL);
1885
1886         if (!ops)
1887                 return ERR_PTR(-EINVAL);
1888
1889         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1890                 return ERR_PTR(-EINVAL);
1891
1892         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1893         if (!tz)
1894                 return ERR_PTR(-ENOMEM);
1895
1896         INIT_LIST_HEAD(&tz->thermal_instances);
1897         idr_init(&tz->idr);
1898         mutex_init(&tz->lock);
1899         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1900         if (result) {
1901                 kfree(tz);
1902                 return ERR_PTR(result);
1903         }
1904
1905         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1906         tz->ops = ops;
1907         tz->tzp = tzp;
1908         tz->device.class = &thermal_class;
1909         tz->devdata = devdata;
1910         tz->trips = trips;
1911         tz->passive_delay = passive_delay;
1912         tz->polling_delay = polling_delay;
1913         /* A new thermal zone needs to be updated anyway. */
1914         atomic_set(&tz->need_update, 1);
1915
1916         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1917         result = device_register(&tz->device);
1918         if (result) {
1919                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1920                 kfree(tz);
1921                 return ERR_PTR(result);
1922         }
1923
1924         /* sys I/F */
1925         if (type) {
1926                 result = device_create_file(&tz->device, &dev_attr_type);
1927                 if (result)
1928                         goto unregister;
1929         }
1930
1931         result = device_create_file(&tz->device, &dev_attr_temp);
1932         if (result)
1933                 goto unregister;
1934
1935         if (ops->get_mode) {
1936                 result = device_create_file(&tz->device, &dev_attr_mode);
1937                 if (result)
1938                         goto unregister;
1939         }
1940
1941         result = create_trip_attrs(tz, mask);
1942         if (result)
1943                 goto unregister;
1944
1945         for (count = 0; count < trips; count++) {
1946                 if (tz->ops->get_trip_type(tz, count, &trip_type))
1947                         set_bit(count, &tz->trips_disabled);
1948                 if (trip_type == THERMAL_TRIP_PASSIVE)
1949                         passive = 1;
1950                 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1951                         set_bit(count, &tz->trips_disabled);
1952                 /* Check for bogus trip points */
1953                 if (trip_temp == 0)
1954                         set_bit(count, &tz->trips_disabled);
1955         }
1956
1957         if (!passive) {
1958                 result = device_create_file(&tz->device, &dev_attr_passive);
1959                 if (result)
1960                         goto unregister;
1961         }
1962
1963         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1964                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1965                 if (result)
1966                         goto unregister;
1967         }
1968
1969         /* Create policy attribute */
1970         result = device_create_file(&tz->device, &dev_attr_policy);
1971         if (result)
1972                 goto unregister;
1973
1974         /* Add thermal zone params */
1975         result = create_tzp_attrs(&tz->device);
1976         if (result)
1977                 goto unregister;
1978
1979         /* Create available_policies attribute */
1980         result = device_create_file(&tz->device, &dev_attr_available_policies);
1981         if (result)
1982                 goto unregister;
1983
1984         /* Update 'this' zone's governor information */
1985         mutex_lock(&thermal_governor_lock);
1986
1987         if (tz->tzp)
1988                 governor = __find_governor(tz->tzp->governor_name);
1989         else
1990                 governor = def_governor;
1991
1992         result = thermal_set_governor(tz, governor);
1993         if (result) {
1994                 mutex_unlock(&thermal_governor_lock);
1995                 goto unregister;
1996         }
1997
1998         mutex_unlock(&thermal_governor_lock);
1999
2000         if (!tz->tzp || !tz->tzp->no_hwmon) {
2001                 result = thermal_add_hwmon_sysfs(tz);
2002                 if (result)
2003                         goto unregister;
2004         }
2005
2006         mutex_lock(&thermal_list_lock);
2007         list_add_tail(&tz->node, &thermal_tz_list);
2008         mutex_unlock(&thermal_list_lock);
2009
2010         /* Bind cooling devices for this zone */
2011         bind_tz(tz);
2012
2013         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
2014
2015         thermal_zone_device_reset(tz);
2016         /* Update the new thermal zone and mark it as already updated. */
2017         if (atomic_cmpxchg(&tz->need_update, 1, 0))
2018                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
2019
2020         return tz;
2021
2022 unregister:
2023         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2024         device_unregister(&tz->device);
2025         return ERR_PTR(result);
2026 }
2027 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
2028
2029 /**
2030  * thermal_zone_device_unregister - removes the registered thermal zone device
2031  * @tz: the thermal zone device to remove
2032  */
2033 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
2034 {
2035         int i;
2036         const struct thermal_zone_params *tzp;
2037         struct thermal_cooling_device *cdev;
2038         struct thermal_zone_device *pos = NULL;
2039
2040         if (!tz)
2041                 return;
2042
2043         tzp = tz->tzp;
2044
2045         mutex_lock(&thermal_list_lock);
2046         list_for_each_entry(pos, &thermal_tz_list, node)
2047             if (pos == tz)
2048                 break;
2049         if (pos != tz) {
2050                 /* thermal zone device not found */
2051                 mutex_unlock(&thermal_list_lock);
2052                 return;
2053         }
2054         list_del(&tz->node);
2055
2056         /* Unbind all cdevs associated with 'this' thermal zone */
2057         list_for_each_entry(cdev, &thermal_cdev_list, node) {
2058                 if (tz->ops->unbind) {
2059                         tz->ops->unbind(tz, cdev);
2060                         continue;
2061                 }
2062
2063                 if (!tzp || !tzp->tbp)
2064                         break;
2065
2066                 for (i = 0; i < tzp->num_tbps; i++) {
2067                         if (tzp->tbp[i].cdev == cdev) {
2068                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
2069                                 tzp->tbp[i].cdev = NULL;
2070                         }
2071                 }
2072         }
2073
2074         mutex_unlock(&thermal_list_lock);
2075
2076         cancel_delayed_work_sync(&tz->poll_queue);
2077
2078         if (tz->type[0])
2079                 device_remove_file(&tz->device, &dev_attr_type);
2080         device_remove_file(&tz->device, &dev_attr_temp);
2081         if (tz->ops->get_mode)
2082                 device_remove_file(&tz->device, &dev_attr_mode);
2083         device_remove_file(&tz->device, &dev_attr_policy);
2084         device_remove_file(&tz->device, &dev_attr_available_policies);
2085         remove_trip_attrs(tz);
2086         thermal_set_governor(tz, NULL);
2087
2088         thermal_remove_hwmon_sysfs(tz);
2089         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2090         idr_destroy(&tz->idr);
2091         mutex_destroy(&tz->lock);
2092         device_unregister(&tz->device);
2093         return;
2094 }
2095 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2096
2097 /**
2098  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2099  * @name: thermal zone name to fetch the temperature
2100  *
2101  * When only one zone is found with the passed name, returns a reference to it.
2102  *
2103  * Return: On success returns a reference to an unique thermal zone with
2104  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2105  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2106  */
2107 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2108 {
2109         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2110         unsigned int found = 0;
2111
2112         if (!name)
2113                 goto exit;
2114
2115         mutex_lock(&thermal_list_lock);
2116         list_for_each_entry(pos, &thermal_tz_list, node)
2117                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2118                         found++;
2119                         ref = pos;
2120                 }
2121         mutex_unlock(&thermal_list_lock);
2122
2123         /* nothing has been found, thus an error code for it */
2124         if (found == 0)
2125                 ref = ERR_PTR(-ENODEV);
2126         else if (found > 1)
2127         /* Success only when an unique zone is found */
2128                 ref = ERR_PTR(-EEXIST);
2129
2130 exit:
2131         return ref;
2132 }
2133 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2134
2135 /**
2136  * thermal_zone_get_slope - return the slope attribute of the thermal zone
2137  * @tz: thermal zone device with the slope attribute
2138  *
2139  * Return: If the thermal zone device has a slope attribute, return it, else
2140  * return 1.
2141  */
2142 int thermal_zone_get_slope(struct thermal_zone_device *tz)
2143 {
2144         if (tz && tz->tzp)
2145                 return tz->tzp->slope;
2146         return 1;
2147 }
2148 EXPORT_SYMBOL_GPL(thermal_zone_get_slope);
2149
2150 /**
2151  * thermal_zone_get_offset - return the offset attribute of the thermal zone
2152  * @tz: thermal zone device with the offset attribute
2153  *
2154  * Return: If the thermal zone device has a offset attribute, return it, else
2155  * return 0.
2156  */
2157 int thermal_zone_get_offset(struct thermal_zone_device *tz)
2158 {
2159         if (tz && tz->tzp)
2160                 return tz->tzp->offset;
2161         return 0;
2162 }
2163 EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
2164
2165 #ifdef CONFIG_NET
2166 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2167         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2168 };
2169
2170 static struct genl_family thermal_event_genl_family = {
2171         .id = GENL_ID_GENERATE,
2172         .name = THERMAL_GENL_FAMILY_NAME,
2173         .version = THERMAL_GENL_VERSION,
2174         .maxattr = THERMAL_GENL_ATTR_MAX,
2175         .mcgrps = thermal_event_mcgrps,
2176         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2177 };
2178
2179 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2180                                         enum events event)
2181 {
2182         struct sk_buff *skb;
2183         struct nlattr *attr;
2184         struct thermal_genl_event *thermal_event;
2185         void *msg_header;
2186         int size;
2187         int result;
2188         static unsigned int thermal_event_seqnum;
2189
2190         if (!tz)
2191                 return -EINVAL;
2192
2193         /* allocate memory */
2194         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2195                nla_total_size(0);
2196
2197         skb = genlmsg_new(size, GFP_ATOMIC);
2198         if (!skb)
2199                 return -ENOMEM;
2200
2201         /* add the genetlink message header */
2202         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2203                                  &thermal_event_genl_family, 0,
2204                                  THERMAL_GENL_CMD_EVENT);
2205         if (!msg_header) {
2206                 nlmsg_free(skb);
2207                 return -ENOMEM;
2208         }
2209
2210         /* fill the data */
2211         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2212                            sizeof(struct thermal_genl_event));
2213
2214         if (!attr) {
2215                 nlmsg_free(skb);
2216                 return -EINVAL;
2217         }
2218
2219         thermal_event = nla_data(attr);
2220         if (!thermal_event) {
2221                 nlmsg_free(skb);
2222                 return -EINVAL;
2223         }
2224
2225         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2226
2227         thermal_event->orig = tz->id;
2228         thermal_event->event = event;
2229
2230         /* send multicast genetlink message */
2231         genlmsg_end(skb, msg_header);
2232
2233         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2234                                    0, GFP_ATOMIC);
2235         if (result)
2236                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2237
2238         return result;
2239 }
2240 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2241
2242 static int genetlink_init(void)
2243 {
2244         return genl_register_family(&thermal_event_genl_family);
2245 }
2246
2247 static void genetlink_exit(void)
2248 {
2249         genl_unregister_family(&thermal_event_genl_family);
2250 }
2251 #else /* !CONFIG_NET */
2252 static inline int genetlink_init(void) { return 0; }
2253 static inline void genetlink_exit(void) {}
2254 #endif /* !CONFIG_NET */
2255
2256 static int __init thermal_register_governors(void)
2257 {
2258         int result;
2259
2260         result = thermal_gov_step_wise_register();
2261         if (result)
2262                 return result;
2263
2264         result = thermal_gov_fair_share_register();
2265         if (result)
2266                 return result;
2267
2268         result = thermal_gov_bang_bang_register();
2269         if (result)
2270                 return result;
2271
2272         result = thermal_gov_user_space_register();
2273         if (result)
2274                 return result;
2275
2276         return thermal_gov_power_allocator_register();
2277 }
2278
2279 static void thermal_unregister_governors(void)
2280 {
2281         thermal_gov_step_wise_unregister();
2282         thermal_gov_fair_share_unregister();
2283         thermal_gov_bang_bang_unregister();
2284         thermal_gov_user_space_unregister();
2285         thermal_gov_power_allocator_unregister();
2286 }
2287
2288 static int thermal_pm_notify(struct notifier_block *nb,
2289                                 unsigned long mode, void *_unused)
2290 {
2291         struct thermal_zone_device *tz;
2292
2293         switch (mode) {
2294         case PM_HIBERNATION_PREPARE:
2295         case PM_RESTORE_PREPARE:
2296         case PM_SUSPEND_PREPARE:
2297                 atomic_set(&in_suspend, 1);
2298                 break;
2299         case PM_POST_HIBERNATION:
2300         case PM_POST_RESTORE:
2301         case PM_POST_SUSPEND:
2302                 atomic_set(&in_suspend, 0);
2303                 list_for_each_entry(tz, &thermal_tz_list, node) {
2304                         thermal_zone_device_init(tz);
2305                         thermal_zone_device_update(tz,
2306                                                    THERMAL_EVENT_UNSPECIFIED);
2307                 }
2308                 break;
2309         default:
2310                 break;
2311         }
2312         return 0;
2313 }
2314
2315 static struct notifier_block thermal_pm_nb = {
2316         .notifier_call = thermal_pm_notify,
2317 };
2318
2319 static int __init thermal_init(void)
2320 {
2321         int result;
2322
2323         result = thermal_register_governors();
2324         if (result)
2325                 goto error;
2326
2327         result = class_register(&thermal_class);
2328         if (result)
2329                 goto unregister_governors;
2330
2331         result = genetlink_init();
2332         if (result)
2333                 goto unregister_class;
2334
2335         result = of_parse_thermal_zones();
2336         if (result)
2337                 goto exit_netlink;
2338
2339         result = register_pm_notifier(&thermal_pm_nb);
2340         if (result)
2341                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2342                         result);
2343
2344         return 0;
2345
2346 exit_netlink:
2347         genetlink_exit();
2348 unregister_class:
2349         class_unregister(&thermal_class);
2350 unregister_governors:
2351         thermal_unregister_governors();
2352 error:
2353         idr_destroy(&thermal_tz_idr);
2354         idr_destroy(&thermal_cdev_idr);
2355         mutex_destroy(&thermal_idr_lock);
2356         mutex_destroy(&thermal_list_lock);
2357         mutex_destroy(&thermal_governor_lock);
2358         return result;
2359 }
2360
2361 static void __exit thermal_exit(void)
2362 {
2363         unregister_pm_notifier(&thermal_pm_nb);
2364         of_thermal_destroy_zones();
2365         genetlink_exit();
2366         class_unregister(&thermal_class);
2367         thermal_unregister_governors();
2368         idr_destroy(&thermal_tz_idr);
2369         idr_destroy(&thermal_cdev_idr);
2370         mutex_destroy(&thermal_idr_lock);
2371         mutex_destroy(&thermal_list_lock);
2372         mutex_destroy(&thermal_governor_lock);
2373 }
2374
2375 fs_initcall(thermal_init);
2376 module_exit(thermal_exit);