drivers/thermal/thermal_core.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/reboot.h>
  36 #include <linux/string.h>
  37 #include <linux/of.h>
  38 #include <net/netlink.h>
  39 #include <net/genetlink.h>
  40 #include <linux/suspend.h>
  41
  42 #define CREATE_TRACE_POINTS
  43 #include <trace/events/thermal.h>
  44
  45 #include "thermal_core.h"
  46 #include "thermal_hwmon.h"
  47
  48 MODULE_AUTHOR("Zhang Rui");
  49 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  50 MODULE_LICENSE("GPL v2");
  51
  52 static DEFINE_IDR(thermal_tz_idr);
  53 static DEFINE_IDR(thermal_cdev_idr);
  54 static DEFINE_MUTEX(thermal_idr_lock);
  55
  56 static LIST_HEAD(thermal_tz_list);
  57 static LIST_HEAD(thermal_cdev_list);
  58 static LIST_HEAD(thermal_governor_list);
  59
  60 static DEFINE_MUTEX(thermal_list_lock);
  61 static DEFINE_MUTEX(thermal_governor_lock);
  62
  63 static atomic_t in_suspend;
  64
  65 static struct thermal_governor *def_governor;
  66
  67 static struct thermal_governor *__find_governor(const char *name)
  68 {
  69         struct thermal_governor *pos;
  70
  71         if (!name || !name[0])
  72                 return def_governor;
  73
  74         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  75                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  76                         return pos;
  77
  78         return NULL;
  79 }
  80
  81 /**
  82  * bind_previous_governor() - bind the previous governor of the thermal zone
  83  * @tz:         a valid pointer to a struct thermal_zone_device
  84  * @failed_gov_name:    the name of the governor that failed to register
  85  *
  86  * Register the previous governor of the thermal zone after a new
  87  * governor has failed to be bound.
  88  */
  89 static void bind_previous_governor(struct thermal_zone_device *tz,
  90                                    const char *failed_gov_name)
  91 {
  92         if (tz->governor && tz->governor->bind_to_tz) {
  93                 if (tz->governor->bind_to_tz(tz)) {
  94                         dev_err(&tz->device,
  95                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  96                                 failed_gov_name, tz->governor->name, tz->type);
  97                         tz->governor = NULL;
  98                 }
  99         }
 100 }
 101
 102 /**
 103  * thermal_set_governor() - Switch to another governor
 104  * @tz:         a valid pointer to a struct thermal_zone_device
 105  * @new_gov:    pointer to the new governor
 106  *
 107  * Change the governor of thermal zone @tz.
 108  *
 109  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
 110  */
 111 static int thermal_set_governor(struct thermal_zone_device *tz,
 112                                 struct thermal_governor *new_gov)
 113 {
 114         int ret = 0;
 115
 116         if (tz->governor && tz->governor->unbind_from_tz)
 117                 tz->governor->unbind_from_tz(tz);
 118
 119         if (new_gov && new_gov->bind_to_tz) {
 120                 ret = new_gov->bind_to_tz(tz);
 121                 if (ret) {
 122                         bind_previous_governor(tz, new_gov->name);
 123
 124                         return ret;
 125                 }
 126         }
 127
 128         tz->governor = new_gov;
 129
 130         return ret;
 131 }
 132
 133 int thermal_register_governor(struct thermal_governor *governor)
 134 {
 135         int err;
 136         const char *name;
 137         struct thermal_zone_device *pos;
 138
 139         if (!governor)
 140                 return -EINVAL;
 141
 142         mutex_lock(&thermal_governor_lock);
 143
 144         err = -EBUSY;
 145         if (__find_governor(governor->name) == NULL) {
 146                 err = 0;
 147                 list_add(&governor->governor_list, &thermal_governor_list);
 148                 if (!def_governor && !strncmp(governor->name,
 149                         DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
 150                         def_governor = governor;
 151         }
 152
 153         mutex_lock(&thermal_list_lock);
 154
 155         list_for_each_entry(pos, &thermal_tz_list, node) {
 156                 /*
 157                  * only thermal zones with specified tz->tzp->governor_name
 158                  * may run with tz->govenor unset
 159                  */
 160                 if (pos->governor)
 161                         continue;
 162
 163                 name = pos->tzp->governor_name;
 164
 165                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 166                         int ret;
 167
 168                         ret = thermal_set_governor(pos, governor);
 169                         if (ret)
 170                                 dev_err(&pos->device,
 171                                         "Failed to set governor %s for thermal zone %s: %d\n",
 172                                         governor->name, pos->type, ret);
 173                 }
 174         }
 175
 176         mutex_unlock(&thermal_list_lock);
 177         mutex_unlock(&thermal_governor_lock);
 178
 179         return err;
 180 }
 181
 182 void thermal_unregister_governor(struct thermal_governor *governor)
 183 {
 184         struct thermal_zone_device *pos;
 185
 186         if (!governor)
 187                 return;
 188
 189         mutex_lock(&thermal_governor_lock);
 190
 191         if (__find_governor(governor->name) == NULL)
 192                 goto exit;
 193
 194         mutex_lock(&thermal_list_lock);
 195
 196         list_for_each_entry(pos, &thermal_tz_list, node) {
 197                 if (!strncasecmp(pos->governor->name, governor->name,
 198                                                 THERMAL_NAME_LENGTH))
 199                         thermal_set_governor(pos, NULL);
 200         }
 201
 202         mutex_unlock(&thermal_list_lock);
 203         list_del(&governor->governor_list);
 204 exit:
 205         mutex_unlock(&thermal_governor_lock);
 206         return;
 207 }
 208
 209 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 210 {
 211         int ret;
 212
 213         if (lock)
 214                 mutex_lock(lock);
 215         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 216         if (lock)
 217                 mutex_unlock(lock);
 218         if (unlikely(ret < 0))
 219                 return ret;
 220         *id = ret;
 221         return 0;
 222 }
 223
 224 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 225 {
 226         if (lock)
 227                 mutex_lock(lock);
 228         idr_remove(idr, id);
 229         if (lock)
 230                 mutex_unlock(lock);
 231 }
 232
 233 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 234 {
 235         enum thermal_trend trend;
 236
 237         if (tz->emul_temperature || !tz->ops->get_trend ||
 238             tz->ops->get_trend(tz, trip, &trend)) {
 239                 if (tz->temperature > tz->last_temperature)
 240                         trend = THERMAL_TREND_RAISING;
 241                 else if (tz->temperature < tz->last_temperature)
 242                         trend = THERMAL_TREND_DROPPING;
 243                 else
 244                         trend = THERMAL_TREND_STABLE;
 245         }
 246
 247         return trend;
 248 }
 249 EXPORT_SYMBOL(get_tz_trend);
 250
 251 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 252                         struct thermal_cooling_device *cdev, int trip)
 253 {
 254         struct thermal_instance *pos = NULL;
 255         struct thermal_instance *target_instance = NULL;
 256
 257         mutex_lock(&tz->lock);
 258         mutex_lock(&cdev->lock);
 259
 260         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 261                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 262                         target_instance = pos;
 263                         break;
 264                 }
 265         }
 266
 267         mutex_unlock(&cdev->lock);
 268         mutex_unlock(&tz->lock);
 269
 270         return target_instance;
 271 }
 272 EXPORT_SYMBOL(get_thermal_instance);
 273
 274 static void print_bind_err_msg(struct thermal_zone_device *tz,
 275                         struct thermal_cooling_device *cdev, int ret)
 276 {
 277         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 278                                 tz->type, cdev->type, ret);
 279 }
 280
 281 static void __bind(struct thermal_zone_device *tz, int mask,
 282                         struct thermal_cooling_device *cdev,
 283                         unsigned long *limits,
 284                         unsigned int weight)
 285 {
 286         int i, ret;
 287
 288         for (i = 0; i < tz->trips; i++) {
 289                 if (mask & (1 << i)) {
 290                         unsigned long upper, lower;
 291
 292                         upper = THERMAL_NO_LIMIT;
 293                         lower = THERMAL_NO_LIMIT;
 294                         if (limits) {
 295                                 lower = limits[i * 2];
 296                                 upper = limits[i * 2 + 1];
 297                         }
 298                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 299                                                                upper, lower,
 300                                                                weight);
 301                         if (ret)
 302                                 print_bind_err_msg(tz, cdev, ret);
 303                 }
 304         }
 305 }
 306
 307 static void __unbind(struct thermal_zone_device *tz, int mask,
 308                         struct thermal_cooling_device *cdev)
 309 {
 310         int i;
 311
 312         for (i = 0; i < tz->trips; i++)
 313                 if (mask & (1 << i))
 314                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 315 }
 316
 317 static void bind_cdev(struct thermal_cooling_device *cdev)
 318 {
 319         int i, ret;
 320         const struct thermal_zone_params *tzp;
 321         struct thermal_zone_device *pos = NULL;
 322
 323         mutex_lock(&thermal_list_lock);
 324
 325         list_for_each_entry(pos, &thermal_tz_list, node) {
 326                 if (!pos->tzp && !pos->ops->bind)
 327                         continue;
 328
 329                 if (pos->ops->bind) {
 330                         ret = pos->ops->bind(pos, cdev);
 331                         if (ret)
 332                                 print_bind_err_msg(pos, cdev, ret);
 333                         continue;
 334                 }
 335
 336                 tzp = pos->tzp;
 337                 if (!tzp || !tzp->tbp)
 338                         continue;
 339
 340                 for (i = 0; i < tzp->num_tbps; i++) {
 341                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 342                                 continue;
 343                         if (tzp->tbp[i].match(pos, cdev))
 344                                 continue;
 345                         tzp->tbp[i].cdev = cdev;
 346                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 347                                tzp->tbp[i].binding_limits,
 348                                tzp->tbp[i].weight);
 349                 }
 350         }
 351
 352         mutex_unlock(&thermal_list_lock);
 353 }
 354
 355 static void bind_tz(struct thermal_zone_device *tz)
 356 {
 357         int i, ret;
 358         struct thermal_cooling_device *pos = NULL;
 359         const struct thermal_zone_params *tzp = tz->tzp;
 360
 361         if (!tzp && !tz->ops->bind)
 362                 return;
 363
 364         mutex_lock(&thermal_list_lock);
 365
 366         /* If there is ops->bind, try to use ops->bind */
 367         if (tz->ops->bind) {
 368                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 369                         ret = tz->ops->bind(tz, pos);
 370                         if (ret)
 371                                 print_bind_err_msg(tz, pos, ret);
 372                 }
 373                 goto exit;
 374         }
 375
 376         if (!tzp || !tzp->tbp)
 377                 goto exit;
 378
 379         list_for_each_entry(pos, &thermal_cdev_list, node) {
 380                 for (i = 0; i < tzp->num_tbps; i++) {
 381                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 382                                 continue;
 383                         if (tzp->tbp[i].match(tz, pos))
 384                                 continue;
 385                         tzp->tbp[i].cdev = pos;
 386                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 387                                tzp->tbp[i].binding_limits,
 388                                tzp->tbp[i].weight);
 389                 }
 390         }
 391 exit:
 392         mutex_unlock(&thermal_list_lock);
 393 }
 394
 395 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 396                                             int delay)
 397 {
 398         if (delay > 1000)
 399                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 400                                  round_jiffies(msecs_to_jiffies(delay)));
 401         else if (delay)
 402                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 403                                  msecs_to_jiffies(delay));
 404         else
 405                 cancel_delayed_work(&tz->poll_queue);
 406 }
 407
 408 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 409 {
 410         mutex_lock(&tz->lock);
 411
 412         if (tz->passive)
 413                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 414         else if (tz->polling_delay)
 415                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 416         else
 417                 thermal_zone_device_set_polling(tz, 0);
 418
 419         mutex_unlock(&tz->lock);
 420 }
 421
 422 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 423                         int trip, enum thermal_trip_type trip_type)
 424 {
 425         tz->governor ? tz->governor->throttle(tz, trip) :
 426                        def_governor->throttle(tz, trip);
 427 }
 428
 429 static void handle_critical_trips(struct thermal_zone_device *tz,
 430                                 int trip, enum thermal_trip_type trip_type)
 431 {
 432         int trip_temp;
 433
 434         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 435
 436         /* If we have not crossed the trip_temp, we do not care. */
 437         if (trip_temp <= 0 || tz->temperature < trip_temp)
 438                 return;
 439
 440         trace_thermal_zone_trip(tz, trip, trip_type);
 441
 442         if (tz->ops->notify)
 443                 tz->ops->notify(tz, trip, trip_type);
 444
 445         if (trip_type == THERMAL_TRIP_CRITICAL) {
 446                 dev_emerg(&tz->device,
 447                           "critical temperature reached(%d C),shutting down\n",
 448                           tz->temperature / 1000);
 449                 orderly_poweroff(true);
 450         }
 451 }
 452
 453 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 454 {
 455         enum thermal_trip_type type;
 456
 457         /* Ignore disabled trip points */
 458         if (test_bit(trip, &tz->trips_disabled))
 459                 return;
 460
 461         tz->ops->get_trip_type(tz, trip, &type);
 462
 463         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 464                 handle_critical_trips(tz, trip, type);
 465         else
 466                 handle_non_critical_trips(tz, trip, type);
 467         /*
 468          * Alright, we handled this trip successfully.
 469          * So, start monitoring again.
 470          */
 471         monitor_thermal_zone(tz);
 472 }
 473
 474 /**
 475  * thermal_zone_get_temp() - returns the temperature of a thermal zone
 476  * @tz: a valid pointer to a struct thermal_zone_device
 477  * @temp: a valid pointer to where to store the resulting temperature.
 478  *
 479  * When a valid thermal zone reference is passed, it will fetch its
 480  * temperature and fill @temp.
 481  *
 482  * Return: On success returns 0, an error code otherwise
 483  */
 484 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 485 {
 486         int ret = -EINVAL;
 487         int count;
 488         int crit_temp = INT_MAX;
 489         enum thermal_trip_type type;
 490
 491         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 492                 goto exit;
 493
 494         mutex_lock(&tz->lock);
 495
 496         ret = tz->ops->get_temp(tz, temp);
 497
 498         if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 499                 for (count = 0; count < tz->trips; count++) {
 500                         ret = tz->ops->get_trip_type(tz, count, &type);
 501                         if (!ret && type == THERMAL_TRIP_CRITICAL) {
 502                                 ret = tz->ops->get_trip_temp(tz, count,
 503                                                 &crit_temp);
 504                                 break;
 505                         }
 506                 }
 507
 508                 /*
 509                  * Only allow emulating a temperature when the real temperature
 510                  * is below the critical temperature so that the emulation code
 511                  * cannot hide critical conditions.
 512                  */
 513                 if (!ret && *temp < crit_temp)
 514                         *temp = tz->emul_temperature;
 515         }
 516
 517         mutex_unlock(&tz->lock);
 518 exit:
 519         return ret;
 520 }
 521 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 522
 523 static void update_temperature(struct thermal_zone_device *tz)
 524 {
 525         int temp, ret;
 526
 527         ret = thermal_zone_get_temp(tz, &temp);
 528         if (ret) {
 529                 if (ret != -EAGAIN)
 530                         dev_warn(&tz->device,
 531                                  "failed to read out thermal zone (%d)\n",
 532                                  ret);
 533                 return;
 534         }
 535
 536         mutex_lock(&tz->lock);
 537         tz->last_temperature = tz->temperature;
 538         tz->temperature = temp;
 539         mutex_unlock(&tz->lock);
 540
 541         trace_thermal_temperature(tz);
 542         if (tz->last_temperature == THERMAL_TEMP_INVALID)
 543                 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
 544                         tz->temperature);
 545         else
 546                 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 547                         tz->last_temperature, tz->temperature);
 548 }
 549
 550 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 551 {
 552         struct thermal_instance *pos;
 553
 554         tz->temperature = THERMAL_TEMP_INVALID;
 555         tz->passive = 0;
 556         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 557                 pos->initialized = false;
 558 }
 559
 560 void thermal_zone_device_update(struct thermal_zone_device *tz)
 561 {
 562         int count;
 563
 564         if (atomic_read(&in_suspend))
 565                 return;
 566
 567         if (!tz->ops->get_temp)
 568                 return;
 569
 570         update_temperature(tz);
 571
 572         for (count = 0; count < tz->trips; count++)
 573                 handle_thermal_trip(tz, count);
 574 }
 575 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 576
 577 static void thermal_zone_device_check(struct work_struct *work)
 578 {
 579         struct thermal_zone_device *tz = container_of(work, struct
 580                                                       thermal_zone_device,
 581                                                       poll_queue.work);
 582         thermal_zone_device_update(tz);
 583 }
 584
 585 /* sys I/F for thermal zone */
 586
 587 #define to_thermal_zone(_dev) \
 588         container_of(_dev, struct thermal_zone_device, device)
 589
 590 static ssize_t
 591 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 592 {
 593         struct thermal_zone_device *tz = to_thermal_zone(dev);
 594
 595         return sprintf(buf, "%s\n", tz->type);
 596 }
 597
 598 static ssize_t
 599 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 600 {
 601         struct thermal_zone_device *tz = to_thermal_zone(dev);
 602         int temperature, ret;
 603
 604         ret = thermal_zone_get_temp(tz, &temperature);
 605
 606         if (ret)
 607                 return ret;
 608
 609         return sprintf(buf, "%d\n", temperature);
 610 }
 611
 612 static ssize_t
 613 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 614 {
 615         struct thermal_zone_device *tz = to_thermal_zone(dev);
 616         enum thermal_device_mode mode;
 617         int result;
 618
 619         if (!tz->ops->get_mode)
 620                 return -EPERM;
 621
 622         result = tz->ops->get_mode(tz, &mode);
 623         if (result)
 624                 return result;
 625
 626         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 627                        : "disabled");
 628 }
 629
 630 static ssize_t
 631 mode_store(struct device *dev, struct device_attribute *attr,
 632            const char *buf, size_t count)
 633 {
 634         struct thermal_zone_device *tz = to_thermal_zone(dev);
 635         int result;
 636
 637         if (!tz->ops->set_mode)
 638                 return -EPERM;
 639
 640         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 641                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 642         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 643                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 644         else
 645                 result = -EINVAL;
 646
 647         if (result)
 648                 return result;
 649
 650         return count;
 651 }
 652
 653 static ssize_t
 654 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 655                      char *buf)
 656 {
 657         struct thermal_zone_device *tz = to_thermal_zone(dev);
 658         enum thermal_trip_type type;
 659         int trip, result;
 660
 661         if (!tz->ops->get_trip_type)
 662                 return -EPERM;
 663
 664         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 665                 return -EINVAL;
 666
 667         result = tz->ops->get_trip_type(tz, trip, &type);
 668         if (result)
 669                 return result;
 670
 671         switch (type) {
 672         case THERMAL_TRIP_CRITICAL:
 673                 return sprintf(buf, "critical\n");
 674         case THERMAL_TRIP_HOT:
 675                 return sprintf(buf, "hot\n");
 676         case THERMAL_TRIP_PASSIVE:
 677                 return sprintf(buf, "passive\n");
 678         case THERMAL_TRIP_ACTIVE:
 679                 return sprintf(buf, "active\n");
 680         default:
 681                 return sprintf(buf, "unknown\n");
 682         }
 683 }
 684
 685 static ssize_t
 686 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 687                      const char *buf, size_t count)
 688 {
 689         struct thermal_zone_device *tz = to_thermal_zone(dev);
 690         int trip, ret;
 691         int temperature;
 692
 693         if (!tz->ops->set_trip_temp)
 694                 return -EPERM;
 695
 696         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 697                 return -EINVAL;
 698
 699         if (kstrtoint(buf, 10, &temperature))
 700                 return -EINVAL;
 701
 702         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 703         if (ret)
 704                 return ret;
 705
 706         thermal_zone_device_update(tz);
 707
 708         return count;
 709 }
 710
 711 static ssize_t
 712 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 713                      char *buf)
 714 {
 715         struct thermal_zone_device *tz = to_thermal_zone(dev);
 716         int trip, ret;
 717         int temperature;
 718
 719         if (!tz->ops->get_trip_temp)
 720                 return -EPERM;
 721
 722         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 723                 return -EINVAL;
 724
 725         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 726
 727         if (ret)
 728                 return ret;
 729
 730         return sprintf(buf, "%d\n", temperature);
 731 }
 732
 733 static ssize_t
 734 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 735                         const char *buf, size_t count)
 736 {
 737         struct thermal_zone_device *tz = to_thermal_zone(dev);
 738         int trip, ret;
 739         int temperature;
 740
 741         if (!tz->ops->set_trip_hyst)
 742                 return -EPERM;
 743
 744         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 745                 return -EINVAL;
 746
 747         if (kstrtoint(buf, 10, &temperature))
 748                 return -EINVAL;
 749
 750         /*
 751          * We are not doing any check on the 'temperature' value
 752          * here. The driver implementing 'set_trip_hyst' has to
 753          * take care of this.
 754          */
 755         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 756
 757         return ret ? ret : count;
 758 }
 759
 760 static ssize_t
 761 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 762                         char *buf)
 763 {
 764         struct thermal_zone_device *tz = to_thermal_zone(dev);
 765         int trip, ret;
 766         int temperature;
 767
 768         if (!tz->ops->get_trip_hyst)
 769                 return -EPERM;
 770
 771         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 772                 return -EINVAL;
 773
 774         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 775
 776         return ret ? ret : sprintf(buf, "%d\n", temperature);
 777 }
 778
 779 static ssize_t
 780 passive_store(struct device *dev, struct device_attribute *attr,
 781                     const char *buf, size_t count)
 782 {
 783         struct thermal_zone_device *tz = to_thermal_zone(dev);
 784         struct thermal_cooling_device *cdev = NULL;
 785         int state;
 786
 787         if (!sscanf(buf, "%d\n", &state))
 788                 return -EINVAL;
 789
 790         /* sanity check: values below 1000 millicelcius don't make sense
 791          * and can cause the system to go into a thermal heart attack
 792          */
 793         if (state && state < 1000)
 794                 return -EINVAL;
 795
 796         if (state && !tz->forced_passive) {
 797                 mutex_lock(&thermal_list_lock);
 798                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 799                         if (!strncmp("Processor", cdev->type,
 800                                      sizeof("Processor")))
 801                                 thermal_zone_bind_cooling_device(tz,
 802                                                 THERMAL_TRIPS_NONE, cdev,
 803                                                 THERMAL_NO_LIMIT,
 804                                                 THERMAL_NO_LIMIT,
 805                                                 THERMAL_WEIGHT_DEFAULT);
 806                 }
 807                 mutex_unlock(&thermal_list_lock);
 808                 if (!tz->passive_delay)
 809                         tz->passive_delay = 1000;
 810         } else if (!state && tz->forced_passive) {
 811                 mutex_lock(&thermal_list_lock);
 812                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 813                         if (!strncmp("Processor", cdev->type,
 814                                      sizeof("Processor")))
 815                                 thermal_zone_unbind_cooling_device(tz,
 816                                                                    THERMAL_TRIPS_NONE,
 817                                                                    cdev);
 818                 }
 819                 mutex_unlock(&thermal_list_lock);
 820                 tz->passive_delay = 0;
 821         }
 822
 823         tz->forced_passive = state;
 824
 825         thermal_zone_device_update(tz);
 826
 827         return count;
 828 }
 829
 830 static ssize_t
 831 passive_show(struct device *dev, struct device_attribute *attr,
 832                    char *buf)
 833 {
 834         struct thermal_zone_device *tz = to_thermal_zone(dev);
 835
 836         return sprintf(buf, "%d\n", tz->forced_passive);
 837 }
 838
 839 static ssize_t
 840 policy_store(struct device *dev, struct device_attribute *attr,
 841                     const char *buf, size_t count)
 842 {
 843         int ret = -EINVAL;
 844         struct thermal_zone_device *tz = to_thermal_zone(dev);
 845         struct thermal_governor *gov;
 846         char name[THERMAL_NAME_LENGTH];
 847
 848         snprintf(name, sizeof(name), "%s", buf);
 849
 850         mutex_lock(&thermal_governor_lock);
 851         mutex_lock(&tz->lock);
 852
 853         gov = __find_governor(strim(name));
 854         if (!gov)
 855                 goto exit;
 856
 857         ret = thermal_set_governor(tz, gov);
 858         if (!ret)
 859                 ret = count;
 860
 861 exit:
 862         mutex_unlock(&tz->lock);
 863         mutex_unlock(&thermal_governor_lock);
 864         return ret;
 865 }
 866
 867 static ssize_t
 868 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 869 {
 870         struct thermal_zone_device *tz = to_thermal_zone(dev);
 871
 872         return sprintf(buf, "%s\n", tz->governor->name);
 873 }
 874
 875 static ssize_t
 876 available_policies_show(struct device *dev, struct device_attribute *devattr,
 877                         char *buf)
 878 {
 879         struct thermal_governor *pos;
 880         ssize_t count = 0;
 881         ssize_t size = PAGE_SIZE;
 882
 883         mutex_lock(&thermal_governor_lock);
 884
 885         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 886                 size = PAGE_SIZE - count;
 887                 count += scnprintf(buf + count, size, "%s ", pos->name);
 888         }
 889         count += scnprintf(buf + count, size, "\n");
 890
 891         mutex_unlock(&thermal_governor_lock);
 892
 893         return count;
 894 }
 895
 896 static ssize_t
 897 emul_temp_store(struct device *dev, struct device_attribute *attr,
 898                      const char *buf, size_t count)
 899 {
 900         struct thermal_zone_device *tz = to_thermal_zone(dev);
 901         int ret = 0;
 902         int temperature;
 903
 904         if (kstrtoint(buf, 10, &temperature))
 905                 return -EINVAL;
 906
 907         if (!tz->ops->set_emul_temp) {
 908                 mutex_lock(&tz->lock);
 909                 tz->emul_temperature = temperature;
 910                 mutex_unlock(&tz->lock);
 911         } else {
 912                 ret = tz->ops->set_emul_temp(tz, temperature);
 913         }
 914
 915         if (!ret)
 916                 thermal_zone_device_update(tz);
 917
 918         return ret ? ret : count;
 919 }
 920 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 921
 922 static ssize_t
 923 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 924                        char *buf)
 925 {
 926         struct thermal_zone_device *tz = to_thermal_zone(dev);
 927
 928         if (tz->tzp)
 929                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 930         else
 931                 return -EIO;
 932 }
 933
 934 static ssize_t
 935 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 936                         const char *buf, size_t count)
 937 {
 938         struct thermal_zone_device *tz = to_thermal_zone(dev);
 939         u32 sustainable_power;
 940
 941         if (!tz->tzp)
 942                 return -EIO;
 943
 944         if (kstrtou32(buf, 10, &sustainable_power))
 945                 return -EINVAL;
 946
 947         tz->tzp->sustainable_power = sustainable_power;
 948
 949         return count;
 950 }
 951 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 952                 sustainable_power_store);
 953
 954 #define create_s32_tzp_attr(name)                                       \
 955         static ssize_t                                                  \
 956         name##_show(struct device *dev, struct device_attribute *devattr, \
 957                 char *buf)                                              \
 958         {                                                               \
 959         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
 960                                                                         \
 961         if (tz->tzp)                                                    \
 962                 return sprintf(buf, "%d\n", tz->tzp->name);             \
 963         else                                                            \
 964                 return -EIO;                                            \
 965         }                                                               \
 966                                                                         \
 967         static ssize_t                                                  \
 968         name##_store(struct device *dev, struct device_attribute *devattr, \
 969                 const char *buf, size_t count)                          \
 970         {                                                               \
 971                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
 972                 s32 value;                                              \
 973                                                                         \
 974                 if (!tz->tzp)                                           \
 975                         return -EIO;                                    \
 976                                                                         \
 977                 if (kstrtos32(buf, 10, &value))                         \
 978                         return -EINVAL;                                 \
 979                                                                         \
 980                 tz->tzp->name = value;                                  \
 981                                                                         \
 982                 return count;                                           \
 983         }                                                               \
 984         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
 985
 986 create_s32_tzp_attr(k_po);
 987 create_s32_tzp_attr(k_pu);
 988 create_s32_tzp_attr(k_i);
 989 create_s32_tzp_attr(k_d);
 990 create_s32_tzp_attr(integral_cutoff);
 991 create_s32_tzp_attr(slope);
 992 create_s32_tzp_attr(offset);
 993 #undef create_s32_tzp_attr
 994
 995 static struct device_attribute *dev_tzp_attrs[] = {
 996         &dev_attr_sustainable_power,
 997         &dev_attr_k_po,
 998         &dev_attr_k_pu,
 999         &dev_attr_k_i,
1000         &dev_attr_k_d,
1001         &dev_attr_integral_cutoff,
1002         &dev_attr_slope,
1003         &dev_attr_offset,
1004 };
1005
1006 static int create_tzp_attrs(struct device *dev)
1007 {
1008         int i;
1009
1010         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1011                 int ret;
1012                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1013
1014                 ret = device_create_file(dev, dev_attr);
1015                 if (ret)
1016                         return ret;
1017         }
1018
1019         return 0;
1020 }
1021
1022 /**
1023  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1024  * @cdev:       pointer to &thermal_cooling_device
1025  * @tz:         a valid thermal zone device pointer
1026  * @max_power:  pointer in which to store the maximum power
1027  *
1028  * Calculate the maximum power consumption in milliwats that the
1029  * cooling device can currently consume and store it in @max_power.
1030  *
1031  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1032  * power_actor API or -E* on other error.
1033  */
1034 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1035                               struct thermal_zone_device *tz, u32 *max_power)
1036 {
1037         if (!cdev_is_power_actor(cdev))
1038                 return -EINVAL;
1039
1040         return cdev->ops->state2power(cdev, tz, 0, max_power);
1041 }
1042
1043 /**
1044  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1045  * @cdev:       pointer to &thermal_cooling_device
1046  * @tz:         a valid thermal zone device pointer
1047  * @min_power:  pointer in which to store the minimum power
1048  *
1049  * Calculate the minimum power consumption in milliwatts that the
1050  * cooling device can currently consume and store it in @min_power.
1051  *
1052  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1053  * power_actor API or -E* on other error.
1054  */
1055 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1056                               struct thermal_zone_device *tz, u32 *min_power)
1057 {
1058         unsigned long max_state;
1059         int ret;
1060
1061         if (!cdev_is_power_actor(cdev))
1062                 return -EINVAL;
1063
1064         ret = cdev->ops->get_max_state(cdev, &max_state);
1065         if (ret)
1066                 return ret;
1067
1068         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1069 }
1070
1071 /**
1072  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1073  * @cdev:       pointer to &thermal_cooling_device
1074  * @instance:   thermal instance to update
1075  * @power:      the power in milliwatts
1076  *
1077  * Set the cooling device to consume at most @power milliwatts.
1078  *
1079  * Return: 0 on success, -EINVAL if the cooling device does not
1080  * implement the power actor API or -E* for other failures.
1081  */
1082 int power_actor_set_power(struct thermal_cooling_device *cdev,
1083                           struct thermal_instance *instance, u32 power)
1084 {
1085         unsigned long state;
1086         int ret;
1087
1088         if (!cdev_is_power_actor(cdev))
1089                 return -EINVAL;
1090
1091         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1092         if (ret)
1093                 return ret;
1094
1095         instance->target = state;
1096         mutex_lock(&cdev->lock);
1097         cdev->updated = false;
1098         mutex_unlock(&cdev->lock);
1099         thermal_cdev_update(cdev);
1100
1101         return 0;
1102 }
1103
1104 static DEVICE_ATTR(type, 0444, type_show, NULL);
1105 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1106 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1107 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1108 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1109 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1110
1111 /* sys I/F for cooling device */
1112 #define to_cooling_device(_dev) \
1113         container_of(_dev, struct thermal_cooling_device, device)
1114
1115 static ssize_t
1116 thermal_cooling_device_type_show(struct device *dev,
1117                                  struct device_attribute *attr, char *buf)
1118 {
1119         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1120
1121         return sprintf(buf, "%s\n", cdev->type);
1122 }
1123
1124 static ssize_t
1125 thermal_cooling_device_max_state_show(struct device *dev,
1126                                       struct device_attribute *attr, char *buf)
1127 {
1128         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1129         unsigned long state;
1130         int ret;
1131
1132         ret = cdev->ops->get_max_state(cdev, &state);
1133         if (ret)
1134                 return ret;
1135         return sprintf(buf, "%ld\n", state);
1136 }
1137
1138 static ssize_t
1139 thermal_cooling_device_cur_state_show(struct device *dev,
1140                                       struct device_attribute *attr, char *buf)
1141 {
1142         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1143         unsigned long state;
1144         int ret;
1145
1146         ret = cdev->ops->get_cur_state(cdev, &state);
1147         if (ret)
1148                 return ret;
1149         return sprintf(buf, "%ld\n", state);
1150 }
1151
1152 static ssize_t
1153 thermal_cooling_device_cur_state_store(struct device *dev,
1154                                        struct device_attribute *attr,
1155                                        const char *buf, size_t count)
1156 {
1157         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1158         unsigned long state;
1159         int result;
1160
1161         if (!sscanf(buf, "%ld\n", &state))
1162                 return -EINVAL;
1163
1164         if ((long)state < 0)
1165                 return -EINVAL;
1166
1167         result = cdev->ops->set_cur_state(cdev, state);
1168         if (result)
1169                 return result;
1170         return count;
1171 }
1172
1173 static struct device_attribute dev_attr_cdev_type =
1174 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1175 static DEVICE_ATTR(max_state, 0444,
1176                    thermal_cooling_device_max_state_show, NULL);
1177 static DEVICE_ATTR(cur_state, 0644,
1178                    thermal_cooling_device_cur_state_show,
1179                    thermal_cooling_device_cur_state_store);
1180
1181 static ssize_t
1182 thermal_cooling_device_trip_point_show(struct device *dev,
1183                                        struct device_attribute *attr, char *buf)
1184 {
1185         struct thermal_instance *instance;
1186
1187         instance =
1188             container_of(attr, struct thermal_instance, attr);
1189
1190         if (instance->trip == THERMAL_TRIPS_NONE)
1191                 return sprintf(buf, "-1\n");
1192         else
1193                 return sprintf(buf, "%d\n", instance->trip);
1194 }
1195
1196 static struct attribute *cooling_device_attrs[] = {
1197         &dev_attr_cdev_type.attr,
1198         &dev_attr_max_state.attr,
1199         &dev_attr_cur_state.attr,
1200         NULL,
1201 };
1202
1203 static const struct attribute_group cooling_device_attr_group = {
1204         .attrs = cooling_device_attrs,
1205 };
1206
1207 static const struct attribute_group *cooling_device_attr_groups[] = {
1208         &cooling_device_attr_group,
1209         NULL,
1210 };
1211
1212 static ssize_t
1213 thermal_cooling_device_weight_show(struct device *dev,
1214                                    struct device_attribute *attr, char *buf)
1215 {
1216         struct thermal_instance *instance;
1217
1218         instance = container_of(attr, struct thermal_instance, weight_attr);
1219
1220         return sprintf(buf, "%d\n", instance->weight);
1221 }
1222
1223 static ssize_t
1224 thermal_cooling_device_weight_store(struct device *dev,
1225                                     struct device_attribute *attr,
1226                                     const char *buf, size_t count)
1227 {
1228         struct thermal_instance *instance;
1229         int ret, weight;
1230
1231         ret = kstrtoint(buf, 0, &weight);
1232         if (ret)
1233                 return ret;
1234
1235         instance = container_of(attr, struct thermal_instance, weight_attr);
1236         instance->weight = weight;
1237
1238         return count;
1239 }
1240 /* Device management */
1241
1242 /**
1243  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1244  * @tz:         pointer to struct thermal_zone_device
1245  * @trip:       indicates which trip point the cooling devices is
1246  *              associated with in this thermal zone.
1247  * @cdev:       pointer to struct thermal_cooling_device
1248  * @upper:      the Maximum cooling state for this trip point.
1249  *              THERMAL_NO_LIMIT means no upper limit,
1250  *              and the cooling device can be in max_state.
1251  * @lower:      the Minimum cooling state can be used for this trip point.
1252  *              THERMAL_NO_LIMIT means no lower limit,
1253  *              and the cooling device can be in cooling state 0.
1254  * @weight:     The weight of the cooling device to be bound to the
1255  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1256  *              default value
1257  *
1258  * This interface function bind a thermal cooling device to the certain trip
1259  * point of a thermal zone device.
1260  * This function is usually called in the thermal zone device .bind callback.
1261  *
1262  * Return: 0 on success, the proper error value otherwise.
1263  */
1264 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1265                                      int trip,
1266                                      struct thermal_cooling_device *cdev,
1267                                      unsigned long upper, unsigned long lower,
1268                                      unsigned int weight)
1269 {
1270         struct thermal_instance *dev;
1271         struct thermal_instance *pos;
1272         struct thermal_zone_device *pos1;
1273         struct thermal_cooling_device *pos2;
1274         unsigned long max_state;
1275         int result, ret;
1276
1277         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1278                 return -EINVAL;
1279
1280         list_for_each_entry(pos1, &thermal_tz_list, node) {
1281                 if (pos1 == tz)
1282                         break;
1283         }
1284         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1285                 if (pos2 == cdev)
1286                         break;
1287         }
1288
1289         if (tz != pos1 || cdev != pos2)
1290                 return -EINVAL;
1291
1292         ret = cdev->ops->get_max_state(cdev, &max_state);
1293         if (ret)
1294                 return ret;
1295
1296         /* lower default 0, upper default max_state */
1297         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1298         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1299
1300         if (lower > upper || upper > max_state)
1301                 return -EINVAL;
1302
1303         dev =
1304             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1305         if (!dev)
1306                 return -ENOMEM;
1307         dev->tz = tz;
1308         dev->cdev = cdev;
1309         dev->trip = trip;
1310         dev->upper = upper;
1311         dev->lower = lower;
1312         dev->target = THERMAL_NO_TARGET;
1313         dev->weight = weight;
1314
1315         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1316         if (result)
1317                 goto free_mem;
1318
1319         sprintf(dev->name, "cdev%d", dev->id);
1320         result =
1321             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1322         if (result)
1323                 goto release_idr;
1324
1325         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1326         sysfs_attr_init(&dev->attr.attr);
1327         dev->attr.attr.name = dev->attr_name;
1328         dev->attr.attr.mode = 0444;
1329         dev->attr.show = thermal_cooling_device_trip_point_show;
1330         result = device_create_file(&tz->device, &dev->attr);
1331         if (result)
1332                 goto remove_symbol_link;
1333
1334         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1335         sysfs_attr_init(&dev->weight_attr.attr);
1336         dev->weight_attr.attr.name = dev->weight_attr_name;
1337         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1338         dev->weight_attr.show = thermal_cooling_device_weight_show;
1339         dev->weight_attr.store = thermal_cooling_device_weight_store;
1340         result = device_create_file(&tz->device, &dev->weight_attr);
1341         if (result)
1342                 goto remove_trip_file;
1343
1344         mutex_lock(&tz->lock);
1345         mutex_lock(&cdev->lock);
1346         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1347             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1348                 result = -EEXIST;
1349                 break;
1350         }
1351         if (!result) {
1352                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1353                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1354                 atomic_set(&tz->need_update, 1);
1355         }
1356         mutex_unlock(&cdev->lock);
1357         mutex_unlock(&tz->lock);
1358
1359         if (!result)
1360                 return 0;
1361
1362         device_remove_file(&tz->device, &dev->weight_attr);
1363 remove_trip_file:
1364         device_remove_file(&tz->device, &dev->attr);
1365 remove_symbol_link:
1366         sysfs_remove_link(&tz->device.kobj, dev->name);
1367 release_idr:
1368         release_idr(&tz->idr, &tz->lock, dev->id);
1369 free_mem:
1370         kfree(dev);
1371         return result;
1372 }
1373 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1374
1375 /**
1376  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1377  *                                        thermal zone.
1378  * @tz:         pointer to a struct thermal_zone_device.
1379  * @trip:       indicates which trip point the cooling devices is
1380  *              associated with in this thermal zone.
1381  * @cdev:       pointer to a struct thermal_cooling_device.
1382  *
1383  * This interface function unbind a thermal cooling device from the certain
1384  * trip point of a thermal zone device.
1385  * This function is usually called in the thermal zone device .unbind callback.
1386  *
1387  * Return: 0 on success, the proper error value otherwise.
1388  */
1389 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1390                                        int trip,
1391                                        struct thermal_cooling_device *cdev)
1392 {
1393         struct thermal_instance *pos, *next;
1394
1395         mutex_lock(&tz->lock);
1396         mutex_lock(&cdev->lock);
1397         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1398                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1399                         list_del(&pos->tz_node);
1400                         list_del(&pos->cdev_node);
1401                         mutex_unlock(&cdev->lock);
1402                         mutex_unlock(&tz->lock);
1403                         goto unbind;
1404                 }
1405         }
1406         mutex_unlock(&cdev->lock);
1407         mutex_unlock(&tz->lock);
1408
1409         return -ENODEV;
1410
1411 unbind:
1412         device_remove_file(&tz->device, &pos->weight_attr);
1413         device_remove_file(&tz->device, &pos->attr);
1414         sysfs_remove_link(&tz->device.kobj, pos->name);
1415         release_idr(&tz->idr, &tz->lock, pos->id);
1416         kfree(pos);
1417         return 0;
1418 }
1419 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1420
1421 static void thermal_release(struct device *dev)
1422 {
1423         struct thermal_zone_device *tz;
1424         struct thermal_cooling_device *cdev;
1425
1426         if (!strncmp(dev_name(dev), "thermal_zone",
1427                      sizeof("thermal_zone") - 1)) {
1428                 tz = to_thermal_zone(dev);
1429                 kfree(tz);
1430         } else if(!strncmp(dev_name(dev), "cooling_device",
1431                         sizeof("cooling_device") - 1)){
1432                 cdev = to_cooling_device(dev);
1433                 kfree(cdev);
1434         }
1435 }
1436
1437 static struct class thermal_class = {
1438         .name = "thermal",
1439         .dev_release = thermal_release,
1440 };
1441
1442 /**
1443  * __thermal_cooling_device_register() - register a new thermal cooling device
1444  * @np:         a pointer to a device tree node.
1445  * @type:       the thermal cooling device type.
1446  * @devdata:    device private data.
1447  * @ops:                standard thermal cooling devices callbacks.
1448  *
1449  * This interface function adds a new thermal cooling device (fan/processor/...)
1450  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1451  * to all the thermal zone devices registered at the same time.
1452  * It also gives the opportunity to link the cooling device to a device tree
1453  * node, so that it can be bound to a thermal zone created out of device tree.
1454  *
1455  * Return: a pointer to the created struct thermal_cooling_device or an
1456  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1457  */
1458 static struct thermal_cooling_device *
1459 __thermal_cooling_device_register(struct device_node *np,
1460                                   char *type, void *devdata,
1461                                   const struct thermal_cooling_device_ops *ops)
1462 {
1463         struct thermal_cooling_device *cdev;
1464         struct thermal_zone_device *pos = NULL;
1465         int result;
1466
1467         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1468                 return ERR_PTR(-EINVAL);
1469
1470         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1471             !ops->set_cur_state)
1472                 return ERR_PTR(-EINVAL);
1473
1474         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1475         if (!cdev)
1476                 return ERR_PTR(-ENOMEM);
1477
1478         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1479         if (result) {
1480                 kfree(cdev);
1481                 return ERR_PTR(result);
1482         }
1483
1484         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1485         mutex_init(&cdev->lock);
1486         INIT_LIST_HEAD(&cdev->thermal_instances);
1487         cdev->np = np;
1488         cdev->ops = ops;
1489         cdev->updated = false;
1490         cdev->device.class = &thermal_class;
1491         cdev->device.groups = cooling_device_attr_groups;
1492         cdev->devdata = devdata;
1493         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1494         result = device_register(&cdev->device);
1495         if (result) {
1496                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1497                 kfree(cdev);
1498                 return ERR_PTR(result);
1499         }
1500
1501         /* Add 'this' new cdev to the global cdev list */
1502         mutex_lock(&thermal_list_lock);
1503         list_add(&cdev->node, &thermal_cdev_list);
1504         mutex_unlock(&thermal_list_lock);
1505
1506         /* Update binding information for 'this' new cdev */
1507         bind_cdev(cdev);
1508
1509         mutex_lock(&thermal_list_lock);
1510         list_for_each_entry(pos, &thermal_tz_list, node)
1511                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1512                         thermal_zone_device_update(pos);
1513         mutex_unlock(&thermal_list_lock);
1514
1515         return cdev;
1516 }
1517
1518 /**
1519  * thermal_cooling_device_register() - register a new thermal cooling device
1520  * @type:       the thermal cooling device type.
1521  * @devdata:    device private data.
1522  * @ops:                standard thermal cooling devices callbacks.
1523  *
1524  * This interface function adds a new thermal cooling device (fan/processor/...)
1525  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1526  * to all the thermal zone devices registered at the same time.
1527  *
1528  * Return: a pointer to the created struct thermal_cooling_device or an
1529  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1530  */
1531 struct thermal_cooling_device *
1532 thermal_cooling_device_register(char *type, void *devdata,
1533                                 const struct thermal_cooling_device_ops *ops)
1534 {
1535         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1536 }
1537 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1538
1539 /**
1540  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1541  * @np:         a pointer to a device tree node.
1542  * @type:       the thermal cooling device type.
1543  * @devdata:    device private data.
1544  * @ops:                standard thermal cooling devices callbacks.
1545  *
1546  * This function will register a cooling device with device tree node reference.
1547  * This interface function adds a new thermal cooling device (fan/processor/...)
1548  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1549  * to all the thermal zone devices registered at the same time.
1550  *
1551  * Return: a pointer to the created struct thermal_cooling_device or an
1552  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1553  */
1554 struct thermal_cooling_device *
1555 thermal_of_cooling_device_register(struct device_node *np,
1556                                    char *type, void *devdata,
1557                                    const struct thermal_cooling_device_ops *ops)
1558 {
1559         return __thermal_cooling_device_register(np, type, devdata, ops);
1560 }
1561 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1562
1563 /**
1564  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1565  * @cdev:       the thermal cooling device to remove.
1566  *
1567  * thermal_cooling_device_unregister() must be called when the device is no
1568  * longer needed.
1569  */
1570 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1571 {
1572         int i;
1573         const struct thermal_zone_params *tzp;
1574         struct thermal_zone_device *tz;
1575         struct thermal_cooling_device *pos = NULL;
1576
1577         if (!cdev)
1578                 return;
1579
1580         mutex_lock(&thermal_list_lock);
1581         list_for_each_entry(pos, &thermal_cdev_list, node)
1582             if (pos == cdev)
1583                 break;
1584         if (pos != cdev) {
1585                 /* thermal cooling device not found */
1586                 mutex_unlock(&thermal_list_lock);
1587                 return;
1588         }
1589         list_del(&cdev->node);
1590
1591         /* Unbind all thermal zones associated with 'this' cdev */
1592         list_for_each_entry(tz, &thermal_tz_list, node) {
1593                 if (tz->ops->unbind) {
1594                         tz->ops->unbind(tz, cdev);
1595                         continue;
1596                 }
1597
1598                 if (!tz->tzp || !tz->tzp->tbp)
1599                         continue;
1600
1601                 tzp = tz->tzp;
1602                 for (i = 0; i < tzp->num_tbps; i++) {
1603                         if (tzp->tbp[i].cdev == cdev) {
1604                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1605                                 tzp->tbp[i].cdev = NULL;
1606                         }
1607                 }
1608         }
1609
1610         mutex_unlock(&thermal_list_lock);
1611
1612         if (cdev->type[0])
1613                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1614         device_remove_file(&cdev->device, &dev_attr_max_state);
1615         device_remove_file(&cdev->device, &dev_attr_cur_state);
1616
1617         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1618         device_unregister(&cdev->device);
1619         return;
1620 }
1621 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1622
1623 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1624 {
1625         struct thermal_instance *instance;
1626         unsigned long target = 0;
1627
1628         mutex_lock(&cdev->lock);
1629         /* cooling device is updated*/
1630         if (cdev->updated) {
1631                 mutex_unlock(&cdev->lock);
1632                 return;
1633         }
1634
1635         /* Make sure cdev enters the deepest cooling state */
1636         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1637                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1638                                 instance->tz->id, instance->target);
1639                 if (instance->target == THERMAL_NO_TARGET)
1640                         continue;
1641                 if (instance->target > target)
1642                         target = instance->target;
1643         }
1644         cdev->ops->set_cur_state(cdev, target);
1645         cdev->updated = true;
1646         mutex_unlock(&cdev->lock);
1647         trace_cdev_update(cdev, target);
1648         dev_dbg(&cdev->device, "set to state %lu\n", target);
1649 }
1650 EXPORT_SYMBOL(thermal_cdev_update);
1651
1652 /**
1653  * thermal_notify_framework - Sensor drivers use this API to notify framework
1654  * @tz:         thermal zone device
1655  * @trip:       indicates which trip point has been crossed
1656  *
1657  * This function handles the trip events from sensor drivers. It starts
1658  * throttling the cooling devices according to the policy configured.
1659  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1660  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1661  * The throttling policy is based on the configured platform data; if no
1662  * platform data is provided, this uses the step_wise throttling policy.
1663  */
1664 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1665 {
1666         handle_thermal_trip(tz, trip);
1667 }
1668 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1669
1670 /**
1671  * create_trip_attrs() - create attributes for trip points
1672  * @tz:         the thermal zone device
1673  * @mask:       Writeable trip point bitmap.
1674  *
1675  * helper function to instantiate sysfs entries for every trip
1676  * point and its properties of a struct thermal_zone_device.
1677  *
1678  * Return: 0 on success, the proper error value otherwise.
1679  */
1680 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1681 {
1682         int indx;
1683         int size = sizeof(struct thermal_attr) * tz->trips;
1684
1685         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1686         if (!tz->trip_type_attrs)
1687                 return -ENOMEM;
1688
1689         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1690         if (!tz->trip_temp_attrs) {
1691                 kfree(tz->trip_type_attrs);
1692                 return -ENOMEM;
1693         }
1694
1695         if (tz->ops->get_trip_hyst) {
1696                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1697                 if (!tz->trip_hyst_attrs) {
1698                         kfree(tz->trip_type_attrs);
1699                         kfree(tz->trip_temp_attrs);
1700                         return -ENOMEM;
1701                 }
1702         }
1703
1704
1705         for (indx = 0; indx < tz->trips; indx++) {
1706                 /* create trip type attribute */
1707                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1708                          "trip_point_%d_type", indx);
1709
1710                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1711                 tz->trip_type_attrs[indx].attr.attr.name =
1712                                                 tz->trip_type_attrs[indx].name;
1713                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1714                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1715
1716                 device_create_file(&tz->device,
1717                                    &tz->trip_type_attrs[indx].attr);
1718
1719                 /* create trip temp attribute */
1720                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1721                          "trip_point_%d_temp", indx);
1722
1723                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1724                 tz->trip_temp_attrs[indx].attr.attr.name =
1725                                                 tz->trip_temp_attrs[indx].name;
1726                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1727                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1728                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1729                     mask & (1 << indx)) {
1730                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1731                         tz->trip_temp_attrs[indx].attr.store =
1732                                                         trip_point_temp_store;
1733                 }
1734
1735                 device_create_file(&tz->device,
1736                                    &tz->trip_temp_attrs[indx].attr);
1737
1738                 /* create Optional trip hyst attribute */
1739                 if (!tz->ops->get_trip_hyst)
1740                         continue;
1741                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1742                          "trip_point_%d_hyst", indx);
1743
1744                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1745                 tz->trip_hyst_attrs[indx].attr.attr.name =
1746                                         tz->trip_hyst_attrs[indx].name;
1747                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1748                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1749                 if (tz->ops->set_trip_hyst) {
1750                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1751                         tz->trip_hyst_attrs[indx].attr.store =
1752                                         trip_point_hyst_store;
1753                 }
1754
1755                 device_create_file(&tz->device,
1756                                    &tz->trip_hyst_attrs[indx].attr);
1757         }
1758         return 0;
1759 }
1760
1761 static void remove_trip_attrs(struct thermal_zone_device *tz)
1762 {
1763         int indx;
1764
1765         for (indx = 0; indx < tz->trips; indx++) {
1766                 device_remove_file(&tz->device,
1767                                    &tz->trip_type_attrs[indx].attr);
1768                 device_remove_file(&tz->device,
1769                                    &tz->trip_temp_attrs[indx].attr);
1770                 if (tz->ops->get_trip_hyst)
1771                         device_remove_file(&tz->device,
1772                                   &tz->trip_hyst_attrs[indx].attr);
1773         }
1774         kfree(tz->trip_type_attrs);
1775         kfree(tz->trip_temp_attrs);
1776         kfree(tz->trip_hyst_attrs);
1777 }
1778
1779 /**
1780  * thermal_zone_device_register() - register a new thermal zone device
1781  * @type:       the thermal zone device type
1782  * @trips:      the number of trip points the thermal zone support
1783  * @mask:       a bit string indicating the writeablility of trip points
1784  * @devdata:    private device data
1785  * @ops:        standard thermal zone device callbacks
1786  * @tzp:        thermal zone platform parameters
1787  * @passive_delay: number of milliseconds to wait between polls when
1788  *                 performing passive cooling
1789  * @polling_delay: number of milliseconds to wait between polls when checking
1790  *                 whether trip points have been crossed (0 for interrupt
1791  *                 driven systems)
1792  *
1793  * This interface function adds a new thermal zone device (sensor) to
1794  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1795  * thermal cooling devices registered at the same time.
1796  * thermal_zone_device_unregister() must be called when the device is no
1797  * longer needed. The passive cooling depends on the .get_trend() return value.
1798  *
1799  * Return: a pointer to the created struct thermal_zone_device or an
1800  * in case of error, an ERR_PTR. Caller must check return value with
1801  * IS_ERR*() helpers.
1802  */
1803 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1804         int trips, int mask, void *devdata,
1805         struct thermal_zone_device_ops *ops,
1806         struct thermal_zone_params *tzp,
1807         int passive_delay, int polling_delay)
1808 {
1809         struct thermal_zone_device *tz;
1810         enum thermal_trip_type trip_type;
1811         int trip_temp;
1812         int result;
1813         int count;
1814         int passive = 0;
1815         struct thermal_governor *governor;
1816
1817         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1818                 return ERR_PTR(-EINVAL);
1819
1820         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1821                 return ERR_PTR(-EINVAL);
1822
1823         if (!ops)
1824                 return ERR_PTR(-EINVAL);
1825
1826         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1827                 return ERR_PTR(-EINVAL);
1828
1829         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1830         if (!tz)
1831                 return ERR_PTR(-ENOMEM);
1832
1833         INIT_LIST_HEAD(&tz->thermal_instances);
1834         idr_init(&tz->idr);
1835         mutex_init(&tz->lock);
1836         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1837         if (result) {
1838                 kfree(tz);
1839                 return ERR_PTR(result);
1840         }
1841
1842         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1843         tz->ops = ops;
1844         tz->tzp = tzp;
1845         tz->device.class = &thermal_class;
1846         tz->devdata = devdata;
1847         tz->trips = trips;
1848         tz->passive_delay = passive_delay;
1849         tz->polling_delay = polling_delay;
1850         /* A new thermal zone needs to be updated anyway. */
1851         atomic_set(&tz->need_update, 1);
1852
1853         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1854         result = device_register(&tz->device);
1855         if (result) {
1856                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1857                 kfree(tz);
1858                 return ERR_PTR(result);
1859         }
1860
1861         /* sys I/F */
1862         if (type) {
1863                 result = device_create_file(&tz->device, &dev_attr_type);
1864                 if (result)
1865                         goto unregister;
1866         }
1867
1868         result = device_create_file(&tz->device, &dev_attr_temp);
1869         if (result)
1870                 goto unregister;
1871
1872         if (ops->get_mode) {
1873                 result = device_create_file(&tz->device, &dev_attr_mode);
1874                 if (result)
1875                         goto unregister;
1876         }
1877
1878         result = create_trip_attrs(tz, mask);
1879         if (result)
1880                 goto unregister;
1881
1882         for (count = 0; count < trips; count++) {
1883                 if (tz->ops->get_trip_type(tz, count, &trip_type))
1884                         set_bit(count, &tz->trips_disabled);
1885                 if (trip_type == THERMAL_TRIP_PASSIVE)
1886                         passive = 1;
1887                 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1888                         set_bit(count, &tz->trips_disabled);
1889                 /* Check for bogus trip points */
1890                 if (trip_temp == 0)
1891                         set_bit(count, &tz->trips_disabled);
1892         }
1893
1894         if (!passive) {
1895                 result = device_create_file(&tz->device, &dev_attr_passive);
1896                 if (result)
1897                         goto unregister;
1898         }
1899
1900         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1901                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1902                 if (result)
1903                         goto unregister;
1904         }
1905
1906         /* Create policy attribute */
1907         result = device_create_file(&tz->device, &dev_attr_policy);
1908         if (result)
1909                 goto unregister;
1910
1911         /* Add thermal zone params */
1912         result = create_tzp_attrs(&tz->device);
1913         if (result)
1914                 goto unregister;
1915
1916         /* Create available_policies attribute */
1917         result = device_create_file(&tz->device, &dev_attr_available_policies);
1918         if (result)
1919                 goto unregister;
1920
1921         /* Update 'this' zone's governor information */
1922         mutex_lock(&thermal_governor_lock);
1923
1924         if (tz->tzp)
1925                 governor = __find_governor(tz->tzp->governor_name);
1926         else
1927                 governor = def_governor;
1928
1929         result = thermal_set_governor(tz, governor);
1930         if (result) {
1931                 mutex_unlock(&thermal_governor_lock);
1932                 goto unregister;
1933         }
1934
1935         mutex_unlock(&thermal_governor_lock);
1936
1937         if (!tz->tzp || !tz->tzp->no_hwmon) {
1938                 result = thermal_add_hwmon_sysfs(tz);
1939                 if (result)
1940                         goto unregister;
1941         }
1942
1943         mutex_lock(&thermal_list_lock);
1944         list_add_tail(&tz->node, &thermal_tz_list);
1945         mutex_unlock(&thermal_list_lock);
1946
1947         /* Bind cooling devices for this zone */
1948         bind_tz(tz);
1949
1950         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1951
1952         thermal_zone_device_reset(tz);
1953         /* Update the new thermal zone and mark it as already updated. */
1954         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1955                 thermal_zone_device_update(tz);
1956
1957         return tz;
1958
1959 unregister:
1960         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1961         device_unregister(&tz->device);
1962         return ERR_PTR(result);
1963 }
1964 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1965
1966 /**
1967  * thermal_device_unregister - removes the registered thermal zone device
1968  * @tz: the thermal zone device to remove
1969  */
1970 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1971 {
1972         int i;
1973         const struct thermal_zone_params *tzp;
1974         struct thermal_cooling_device *cdev;
1975         struct thermal_zone_device *pos = NULL;
1976
1977         if (!tz)
1978                 return;
1979
1980         tzp = tz->tzp;
1981
1982         mutex_lock(&thermal_list_lock);
1983         list_for_each_entry(pos, &thermal_tz_list, node)
1984             if (pos == tz)
1985                 break;
1986         if (pos != tz) {
1987                 /* thermal zone device not found */
1988                 mutex_unlock(&thermal_list_lock);
1989                 return;
1990         }
1991         list_del(&tz->node);
1992
1993         /* Unbind all cdevs associated with 'this' thermal zone */
1994         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1995                 if (tz->ops->unbind) {
1996                         tz->ops->unbind(tz, cdev);
1997                         continue;
1998                 }
1999
2000                 if (!tzp || !tzp->tbp)
2001                         break;
2002
2003                 for (i = 0; i < tzp->num_tbps; i++) {
2004                         if (tzp->tbp[i].cdev == cdev) {
2005                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
2006                                 tzp->tbp[i].cdev = NULL;
2007                         }
2008                 }
2009         }
2010
2011         mutex_unlock(&thermal_list_lock);
2012
2013         thermal_zone_device_set_polling(tz, 0);
2014
2015         if (tz->type[0])
2016                 device_remove_file(&tz->device, &dev_attr_type);
2017         device_remove_file(&tz->device, &dev_attr_temp);
2018         if (tz->ops->get_mode)
2019                 device_remove_file(&tz->device, &dev_attr_mode);
2020         device_remove_file(&tz->device, &dev_attr_policy);
2021         device_remove_file(&tz->device, &dev_attr_available_policies);
2022         remove_trip_attrs(tz);
2023         thermal_set_governor(tz, NULL);
2024
2025         thermal_remove_hwmon_sysfs(tz);
2026         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2027         idr_destroy(&tz->idr);
2028         mutex_destroy(&tz->lock);
2029         device_unregister(&tz->device);
2030         return;
2031 }
2032 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2033
2034 /**
2035  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2036  * @name: thermal zone name to fetch the temperature
2037  *
2038  * When only one zone is found with the passed name, returns a reference to it.
2039  *
2040  * Return: On success returns a reference to an unique thermal zone with
2041  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2042  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2043  */
2044 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2045 {
2046         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2047         unsigned int found = 0;
2048
2049         if (!name)
2050                 goto exit;
2051
2052         mutex_lock(&thermal_list_lock);
2053         list_for_each_entry(pos, &thermal_tz_list, node)
2054                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2055                         found++;
2056                         ref = pos;
2057                 }
2058         mutex_unlock(&thermal_list_lock);
2059
2060         /* nothing has been found, thus an error code for it */
2061         if (found == 0)
2062                 ref = ERR_PTR(-ENODEV);
2063         else if (found > 1)
2064         /* Success only when an unique zone is found */
2065                 ref = ERR_PTR(-EEXIST);
2066
2067 exit:
2068         return ref;
2069 }
2070 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2071
2072 #ifdef CONFIG_NET
2073 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2074         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2075 };
2076
2077 static struct genl_family thermal_event_genl_family = {
2078         .id = GENL_ID_GENERATE,
2079         .name = THERMAL_GENL_FAMILY_NAME,
2080         .version = THERMAL_GENL_VERSION,
2081         .maxattr = THERMAL_GENL_ATTR_MAX,
2082         .mcgrps = thermal_event_mcgrps,
2083         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2084 };
2085
2086 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2087                                         enum events event)
2088 {
2089         struct sk_buff *skb;
2090         struct nlattr *attr;
2091         struct thermal_genl_event *thermal_event;
2092         void *msg_header;
2093         int size;
2094         int result;
2095         static unsigned int thermal_event_seqnum;
2096
2097         if (!tz)
2098                 return -EINVAL;
2099
2100         /* allocate memory */
2101         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2102                nla_total_size(0);
2103
2104         skb = genlmsg_new(size, GFP_ATOMIC);
2105         if (!skb)
2106                 return -ENOMEM;
2107
2108         /* add the genetlink message header */
2109         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2110                                  &thermal_event_genl_family, 0,
2111                                  THERMAL_GENL_CMD_EVENT);
2112         if (!msg_header) {
2113                 nlmsg_free(skb);
2114                 return -ENOMEM;
2115         }
2116
2117         /* fill the data */
2118         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2119                            sizeof(struct thermal_genl_event));
2120
2121         if (!attr) {
2122                 nlmsg_free(skb);
2123                 return -EINVAL;
2124         }
2125
2126         thermal_event = nla_data(attr);
2127         if (!thermal_event) {
2128                 nlmsg_free(skb);
2129                 return -EINVAL;
2130         }
2131
2132         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2133
2134         thermal_event->orig = tz->id;
2135         thermal_event->event = event;
2136
2137         /* send multicast genetlink message */
2138         genlmsg_end(skb, msg_header);
2139
2140         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2141                                    0, GFP_ATOMIC);
2142         if (result)
2143                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2144
2145         return result;
2146 }
2147 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2148
2149 static int genetlink_init(void)
2150 {
2151         return genl_register_family(&thermal_event_genl_family);
2152 }
2153
2154 static void genetlink_exit(void)
2155 {
2156         genl_unregister_family(&thermal_event_genl_family);
2157 }
2158 #else /* !CONFIG_NET */
2159 static inline int genetlink_init(void) { return 0; }
2160 static inline void genetlink_exit(void) {}
2161 #endif /* !CONFIG_NET */
2162
2163 static int __init thermal_register_governors(void)
2164 {
2165         int result;
2166
2167         result = thermal_gov_step_wise_register();
2168         if (result)
2169                 return result;
2170
2171         result = thermal_gov_fair_share_register();
2172         if (result)
2173                 return result;
2174
2175         result = thermal_gov_bang_bang_register();
2176         if (result)
2177                 return result;
2178
2179         result = thermal_gov_user_space_register();
2180         if (result)
2181                 return result;
2182
2183         return thermal_gov_power_allocator_register();
2184 }
2185
2186 static void thermal_unregister_governors(void)
2187 {
2188         thermal_gov_step_wise_unregister();
2189         thermal_gov_fair_share_unregister();
2190         thermal_gov_bang_bang_unregister();
2191         thermal_gov_user_space_unregister();
2192         thermal_gov_power_allocator_unregister();
2193 }
2194
2195 static int thermal_pm_notify(struct notifier_block *nb,
2196                                 unsigned long mode, void *_unused)
2197 {
2198         struct thermal_zone_device *tz;
2199
2200         switch (mode) {
2201         case PM_HIBERNATION_PREPARE:
2202         case PM_RESTORE_PREPARE:
2203         case PM_SUSPEND_PREPARE:
2204                 atomic_set(&in_suspend, 1);
2205                 break;
2206         case PM_POST_HIBERNATION:
2207         case PM_POST_RESTORE:
2208         case PM_POST_SUSPEND:
2209                 atomic_set(&in_suspend, 0);
2210                 list_for_each_entry(tz, &thermal_tz_list, node) {
2211                         thermal_zone_device_reset(tz);
2212                         thermal_zone_device_update(tz);
2213                 }
2214                 break;
2215         default:
2216                 break;
2217         }
2218         return 0;
2219 }
2220
2221 static struct notifier_block thermal_pm_nb = {
2222         .notifier_call = thermal_pm_notify,
2223 };
2224
2225 static int __init thermal_init(void)
2226 {
2227         int result;
2228
2229         result = thermal_register_governors();
2230         if (result)
2231                 goto error;
2232
2233         result = class_register(&thermal_class);
2234         if (result)
2235                 goto unregister_governors;
2236
2237         result = genetlink_init();
2238         if (result)
2239                 goto unregister_class;
2240
2241         result = of_parse_thermal_zones();
2242         if (result)
2243                 goto exit_netlink;
2244
2245         result = register_pm_notifier(&thermal_pm_nb);
2246         if (result)
2247                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2248                         result);
2249
2250         return 0;
2251
2252 exit_netlink:
2253         genetlink_exit();
2254 unregister_class:
2255         class_unregister(&thermal_class);
2256 unregister_governors:
2257         thermal_unregister_governors();
2258 error:
2259         idr_destroy(&thermal_tz_idr);
2260         idr_destroy(&thermal_cdev_idr);
2261         mutex_destroy(&thermal_idr_lock);
2262         mutex_destroy(&thermal_list_lock);
2263         mutex_destroy(&thermal_governor_lock);
2264         return result;
2265 }
2266
2267 static void __exit thermal_exit(void)
2268 {
2269         unregister_pm_notifier(&thermal_pm_nb);
2270         of_thermal_destroy_zones();
2271         genetlink_exit();
2272         class_unregister(&thermal_class);
2273         thermal_unregister_governors();
2274         idr_destroy(&thermal_tz_idr);
2275         idr_destroy(&thermal_cdev_idr);
2276         mutex_destroy(&thermal_idr_lock);
2277         mutex_destroy(&thermal_list_lock);
2278         mutex_destroy(&thermal_governor_lock);
2279 }
2280
2281 fs_initcall(thermal_init);
2282 module_exit(thermal_exit);