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 <net/netlink.h>
  38 #include <net/genetlink.h>
  39
  40 #include "thermal_core.h"
  41 #include "thermal_hwmon.h"
  42
  43 MODULE_AUTHOR("Zhang Rui");
  44 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  45 MODULE_LICENSE("GPL v2");
  46
  47 static DEFINE_IDR(thermal_tz_idr);
  48 static DEFINE_IDR(thermal_cdev_idr);
  49 static DEFINE_MUTEX(thermal_idr_lock);
  50
  51 static LIST_HEAD(thermal_tz_list);
  52 static LIST_HEAD(thermal_cdev_list);
  53 static LIST_HEAD(thermal_governor_list);
  54
  55 static DEFINE_MUTEX(thermal_list_lock);
  56 static DEFINE_MUTEX(thermal_governor_lock);
  57
  58 static struct thermal_governor *__find_governor(const char *name)
  59 {
  60         struct thermal_governor *pos;
  61
  62         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  63                 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
  64                         return pos;
  65
  66         return NULL;
  67 }
  68
  69 int thermal_register_governor(struct thermal_governor *governor)
  70 {
  71         int err;
  72         const char *name;
  73         struct thermal_zone_device *pos;
  74
  75         if (!governor)
  76                 return -EINVAL;
  77
  78         mutex_lock(&thermal_governor_lock);
  79
  80         err = -EBUSY;
  81         if (__find_governor(governor->name) == NULL) {
  82                 err = 0;
  83                 list_add(&governor->governor_list, &thermal_governor_list);
  84         }
  85
  86         mutex_lock(&thermal_list_lock);
  87
  88         list_for_each_entry(pos, &thermal_tz_list, node) {
  89                 if (pos->governor)
  90                         continue;
  91                 if (pos->tzp)
  92                         name = pos->tzp->governor_name;
  93                 else
  94                         name = DEFAULT_THERMAL_GOVERNOR;
  95                 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
  96                         pos->governor = governor;
  97         }
  98
  99         mutex_unlock(&thermal_list_lock);
 100         mutex_unlock(&thermal_governor_lock);
 101
 102         return err;
 103 }
 104
 105 void thermal_unregister_governor(struct thermal_governor *governor)
 106 {
 107         struct thermal_zone_device *pos;
 108
 109         if (!governor)
 110                 return;
 111
 112         mutex_lock(&thermal_governor_lock);
 113
 114         if (__find_governor(governor->name) == NULL)
 115                 goto exit;
 116
 117         mutex_lock(&thermal_list_lock);
 118
 119         list_for_each_entry(pos, &thermal_tz_list, node) {
 120                 if (!strnicmp(pos->governor->name, governor->name,
 121                                                 THERMAL_NAME_LENGTH))
 122                         pos->governor = NULL;
 123         }
 124
 125         mutex_unlock(&thermal_list_lock);
 126         list_del(&governor->governor_list);
 127 exit:
 128         mutex_unlock(&thermal_governor_lock);
 129         return;
 130 }
 131
 132 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 133 {
 134         int ret;
 135
 136         if (lock)
 137                 mutex_lock(lock);
 138         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 139         if (lock)
 140                 mutex_unlock(lock);
 141         if (unlikely(ret < 0))
 142                 return ret;
 143         *id = ret;
 144         return 0;
 145 }
 146
 147 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 148 {
 149         if (lock)
 150                 mutex_lock(lock);
 151         idr_remove(idr, id);
 152         if (lock)
 153                 mutex_unlock(lock);
 154 }
 155
 156 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 157 {
 158         enum thermal_trend trend;
 159
 160         if (tz->emul_temperature || !tz->ops->get_trend ||
 161             tz->ops->get_trend(tz, trip, &trend)) {
 162                 if (tz->temperature > tz->last_temperature)
 163                         trend = THERMAL_TREND_RAISING;
 164                 else if (tz->temperature < tz->last_temperature)
 165                         trend = THERMAL_TREND_DROPPING;
 166                 else
 167                         trend = THERMAL_TREND_STABLE;
 168         }
 169
 170         return trend;
 171 }
 172 EXPORT_SYMBOL(get_tz_trend);
 173
 174 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 175                         struct thermal_cooling_device *cdev, int trip)
 176 {
 177         struct thermal_instance *pos = NULL;
 178         struct thermal_instance *target_instance = NULL;
 179
 180         mutex_lock(&tz->lock);
 181         mutex_lock(&cdev->lock);
 182
 183         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 184                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 185                         target_instance = pos;
 186                         break;
 187                 }
 188         }
 189
 190         mutex_unlock(&cdev->lock);
 191         mutex_unlock(&tz->lock);
 192
 193         return target_instance;
 194 }
 195 EXPORT_SYMBOL(get_thermal_instance);
 196
 197 static void print_bind_err_msg(struct thermal_zone_device *tz,
 198                         struct thermal_cooling_device *cdev, int ret)
 199 {
 200         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 201                                 tz->type, cdev->type, ret);
 202 }
 203
 204 static void __bind(struct thermal_zone_device *tz, int mask,
 205                         struct thermal_cooling_device *cdev,
 206                         unsigned long *limits)
 207 {
 208         int i, ret;
 209
 210         for (i = 0; i < tz->trips; i++) {
 211                 if (mask & (1 << i)) {
 212                         unsigned long upper, lower;
 213
 214                         upper = THERMAL_NO_LIMIT;
 215                         lower = THERMAL_NO_LIMIT;
 216                         if (limits) {
 217                                 lower = limits[i * 2];
 218                                 upper = limits[i * 2 + 1];
 219                         }
 220                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 221                                                                upper, lower);
 222                         if (ret)
 223                                 print_bind_err_msg(tz, cdev, ret);
 224                 }
 225         }
 226 }
 227
 228 static void __unbind(struct thermal_zone_device *tz, int mask,
 229                         struct thermal_cooling_device *cdev)
 230 {
 231         int i;
 232
 233         for (i = 0; i < tz->trips; i++)
 234                 if (mask & (1 << i))
 235                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 236 }
 237
 238 static void bind_cdev(struct thermal_cooling_device *cdev)
 239 {
 240         int i, ret;
 241         const struct thermal_zone_params *tzp;
 242         struct thermal_zone_device *pos = NULL;
 243
 244         mutex_lock(&thermal_list_lock);
 245
 246         list_for_each_entry(pos, &thermal_tz_list, node) {
 247                 if (!pos->tzp && !pos->ops->bind)
 248                         continue;
 249
 250                 if (pos->ops->bind) {
 251                         ret = pos->ops->bind(pos, cdev);
 252                         if (ret)
 253                                 print_bind_err_msg(pos, cdev, ret);
 254                         continue;
 255                 }
 256
 257                 tzp = pos->tzp;
 258                 if (!tzp || !tzp->tbp)
 259                         continue;
 260
 261                 for (i = 0; i < tzp->num_tbps; i++) {
 262                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 263                                 continue;
 264                         if (tzp->tbp[i].match(pos, cdev))
 265                                 continue;
 266                         tzp->tbp[i].cdev = cdev;
 267                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 268                                tzp->tbp[i].binding_limits);
 269                 }
 270         }
 271
 272         mutex_unlock(&thermal_list_lock);
 273 }
 274
 275 static void bind_tz(struct thermal_zone_device *tz)
 276 {
 277         int i, ret;
 278         struct thermal_cooling_device *pos = NULL;
 279         const struct thermal_zone_params *tzp = tz->tzp;
 280
 281         if (!tzp && !tz->ops->bind)
 282                 return;
 283
 284         mutex_lock(&thermal_list_lock);
 285
 286         /* If there is ops->bind, try to use ops->bind */
 287         if (tz->ops->bind) {
 288                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 289                         ret = tz->ops->bind(tz, pos);
 290                         if (ret)
 291                                 print_bind_err_msg(tz, pos, ret);
 292                 }
 293                 goto exit;
 294         }
 295
 296         if (!tzp || !tzp->tbp)
 297                 goto exit;
 298
 299         list_for_each_entry(pos, &thermal_cdev_list, node) {
 300                 for (i = 0; i < tzp->num_tbps; i++) {
 301                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 302                                 continue;
 303                         if (tzp->tbp[i].match(tz, pos))
 304                                 continue;
 305                         tzp->tbp[i].cdev = pos;
 306                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 307                                tzp->tbp[i].binding_limits);
 308                 }
 309         }
 310 exit:
 311         mutex_unlock(&thermal_list_lock);
 312 }
 313
 314 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 315                                             int delay)
 316 {
 317         if (delay > 1000)
 318                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 319                                  round_jiffies(msecs_to_jiffies(delay)));
 320         else if (delay)
 321                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 322                                  msecs_to_jiffies(delay));
 323         else
 324                 cancel_delayed_work(&tz->poll_queue);
 325 }
 326
 327 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 328 {
 329         mutex_lock(&tz->lock);
 330
 331         if (tz->passive)
 332                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 333         else if (tz->polling_delay)
 334                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 335         else
 336                 thermal_zone_device_set_polling(tz, 0);
 337
 338         mutex_unlock(&tz->lock);
 339 }
 340
 341 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 342                         int trip, enum thermal_trip_type trip_type)
 343 {
 344         if (tz->governor)
 345                 tz->governor->throttle(tz, trip);
 346 }
 347
 348 static void handle_critical_trips(struct thermal_zone_device *tz,
 349                                 int trip, enum thermal_trip_type trip_type)
 350 {
 351         long trip_temp;
 352
 353         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 354
 355         /* If we have not crossed the trip_temp, we do not care. */
 356         if (tz->temperature < trip_temp)
 357                 return;
 358
 359         if (tz->ops->notify)
 360                 tz->ops->notify(tz, trip, trip_type);
 361
 362         if (trip_type == THERMAL_TRIP_CRITICAL) {
 363                 dev_emerg(&tz->device,
 364                           "critical temperature reached(%d C),shutting down\n",
 365                           tz->temperature / 1000);
 366                 orderly_poweroff(true);
 367         }
 368 }
 369
 370 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 371 {
 372         enum thermal_trip_type type;
 373
 374         tz->ops->get_trip_type(tz, trip, &type);
 375
 376         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 377                 handle_critical_trips(tz, trip, type);
 378         else
 379                 handle_non_critical_trips(tz, trip, type);
 380         /*
 381          * Alright, we handled this trip successfully.
 382          * So, start monitoring again.
 383          */
 384         monitor_thermal_zone(tz);
 385 }
 386
 387 /**
 388  * thermal_zone_get_temp() - returns its the temperature of thermal zone
 389  * @tz: a valid pointer to a struct thermal_zone_device
 390  * @temp: a valid pointer to where to store the resulting temperature.
 391  *
 392  * When a valid thermal zone reference is passed, it will fetch its
 393  * temperature and fill @temp.
 394  *
 395  * Return: On success returns 0, an error code otherwise
 396  */
 397 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 398 {
 399         int ret = -EINVAL;
 400 #ifdef CONFIG_THERMAL_EMULATION
 401         int count;
 402         unsigned long crit_temp = -1UL;
 403         enum thermal_trip_type type;
 404 #endif
 405
 406         if (!tz || IS_ERR(tz))
 407                 goto exit;
 408
 409         mutex_lock(&tz->lock);
 410
 411         ret = tz->ops->get_temp(tz, temp);
 412 #ifdef CONFIG_THERMAL_EMULATION
 413         if (!tz->emul_temperature)
 414                 goto skip_emul;
 415
 416         for (count = 0; count < tz->trips; count++) {
 417                 ret = tz->ops->get_trip_type(tz, count, &type);
 418                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 419                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 420                         break;
 421                 }
 422         }
 423
 424         if (ret)
 425                 goto skip_emul;
 426
 427         if (*temp < crit_temp)
 428                 *temp = tz->emul_temperature;
 429 skip_emul:
 430 #endif
 431         mutex_unlock(&tz->lock);
 432 exit:
 433         return ret;
 434 }
 435 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 436
 437 static void update_temperature(struct thermal_zone_device *tz)
 438 {
 439         long temp;
 440         int ret;
 441
 442         ret = thermal_zone_get_temp(tz, &temp);
 443         if (ret) {
 444                 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
 445                          tz->id);
 446                 return;
 447         }
 448
 449         mutex_lock(&tz->lock);
 450         tz->last_temperature = tz->temperature;
 451         tz->temperature = temp;
 452         mutex_unlock(&tz->lock);
 453
 454         dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 455                                 tz->last_temperature, tz->temperature);
 456 }
 457
 458 void thermal_zone_device_update(struct thermal_zone_device *tz)
 459 {
 460         int count;
 461
 462         update_temperature(tz);
 463
 464         for (count = 0; count < tz->trips; count++)
 465                 handle_thermal_trip(tz, count);
 466 }
 467 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 468
 469 static void thermal_zone_device_check(struct work_struct *work)
 470 {
 471         struct thermal_zone_device *tz = container_of(work, struct
 472                                                       thermal_zone_device,
 473                                                       poll_queue.work);
 474         thermal_zone_device_update(tz);
 475 }
 476
 477 /* sys I/F for thermal zone */
 478
 479 #define to_thermal_zone(_dev) \
 480         container_of(_dev, struct thermal_zone_device, device)
 481
 482 static ssize_t
 483 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 484 {
 485         struct thermal_zone_device *tz = to_thermal_zone(dev);
 486
 487         return sprintf(buf, "%s\n", tz->type);
 488 }
 489
 490 static ssize_t
 491 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 492 {
 493         struct thermal_zone_device *tz = to_thermal_zone(dev);
 494         long temperature;
 495         int ret;
 496
 497         ret = thermal_zone_get_temp(tz, &temperature);
 498
 499         if (ret)
 500                 return ret;
 501
 502         return sprintf(buf, "%ld\n", temperature);
 503 }
 504
 505 static ssize_t
 506 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 507 {
 508         struct thermal_zone_device *tz = to_thermal_zone(dev);
 509         enum thermal_device_mode mode;
 510         int result;
 511
 512         if (!tz->ops->get_mode)
 513                 return -EPERM;
 514
 515         result = tz->ops->get_mode(tz, &mode);
 516         if (result)
 517                 return result;
 518
 519         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 520                        : "disabled");
 521 }
 522
 523 static ssize_t
 524 mode_store(struct device *dev, struct device_attribute *attr,
 525            const char *buf, size_t count)
 526 {
 527         struct thermal_zone_device *tz = to_thermal_zone(dev);
 528         int result;
 529
 530         if (!tz->ops->set_mode)
 531                 return -EPERM;
 532
 533         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 534                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 535         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 536                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 537         else
 538                 result = -EINVAL;
 539
 540         if (result)
 541                 return result;
 542
 543         return count;
 544 }
 545
 546 static ssize_t
 547 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 548                      char *buf)
 549 {
 550         struct thermal_zone_device *tz = to_thermal_zone(dev);
 551         enum thermal_trip_type type;
 552         int trip, result;
 553
 554         if (!tz->ops->get_trip_type)
 555                 return -EPERM;
 556
 557         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 558                 return -EINVAL;
 559
 560         result = tz->ops->get_trip_type(tz, trip, &type);
 561         if (result)
 562                 return result;
 563
 564         switch (type) {
 565         case THERMAL_TRIP_CRITICAL:
 566                 return sprintf(buf, "critical\n");
 567         case THERMAL_TRIP_HOT:
 568                 return sprintf(buf, "hot\n");
 569         case THERMAL_TRIP_PASSIVE:
 570                 return sprintf(buf, "passive\n");
 571         case THERMAL_TRIP_ACTIVE:
 572                 return sprintf(buf, "active\n");
 573         default:
 574                 return sprintf(buf, "unknown\n");
 575         }
 576 }
 577
 578 static ssize_t
 579 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 580                      const char *buf, size_t count)
 581 {
 582         struct thermal_zone_device *tz = to_thermal_zone(dev);
 583         int trip, ret;
 584         unsigned long temperature;
 585
 586         if (!tz->ops->set_trip_temp)
 587                 return -EPERM;
 588
 589         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 590                 return -EINVAL;
 591
 592         if (kstrtoul(buf, 10, &temperature))
 593                 return -EINVAL;
 594
 595         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 596
 597         return ret ? ret : count;
 598 }
 599
 600 static ssize_t
 601 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 602                      char *buf)
 603 {
 604         struct thermal_zone_device *tz = to_thermal_zone(dev);
 605         int trip, ret;
 606         long temperature;
 607
 608         if (!tz->ops->get_trip_temp)
 609                 return -EPERM;
 610
 611         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 612                 return -EINVAL;
 613
 614         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 615
 616         if (ret)
 617                 return ret;
 618
 619         return sprintf(buf, "%ld\n", temperature);
 620 }
 621
 622 static ssize_t
 623 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 624                         const char *buf, size_t count)
 625 {
 626         struct thermal_zone_device *tz = to_thermal_zone(dev);
 627         int trip, ret;
 628         unsigned long temperature;
 629
 630         if (!tz->ops->set_trip_hyst)
 631                 return -EPERM;
 632
 633         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 634                 return -EINVAL;
 635
 636         if (kstrtoul(buf, 10, &temperature))
 637                 return -EINVAL;
 638
 639         /*
 640          * We are not doing any check on the 'temperature' value
 641          * here. The driver implementing 'set_trip_hyst' has to
 642          * take care of this.
 643          */
 644         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 645
 646         return ret ? ret : count;
 647 }
 648
 649 static ssize_t
 650 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 651                         char *buf)
 652 {
 653         struct thermal_zone_device *tz = to_thermal_zone(dev);
 654         int trip, ret;
 655         unsigned long temperature;
 656
 657         if (!tz->ops->get_trip_hyst)
 658                 return -EPERM;
 659
 660         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 661                 return -EINVAL;
 662
 663         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 664
 665         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 666 }
 667
 668 static ssize_t
 669 passive_store(struct device *dev, struct device_attribute *attr,
 670                     const char *buf, size_t count)
 671 {
 672         struct thermal_zone_device *tz = to_thermal_zone(dev);
 673         struct thermal_cooling_device *cdev = NULL;
 674         int state;
 675
 676         if (!sscanf(buf, "%d\n", &state))
 677                 return -EINVAL;
 678
 679         /* sanity check: values below 1000 millicelcius don't make sense
 680          * and can cause the system to go into a thermal heart attack
 681          */
 682         if (state && state < 1000)
 683                 return -EINVAL;
 684
 685         if (state && !tz->forced_passive) {
 686                 mutex_lock(&thermal_list_lock);
 687                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 688                         if (!strncmp("Processor", cdev->type,
 689                                      sizeof("Processor")))
 690                                 thermal_zone_bind_cooling_device(tz,
 691                                                 THERMAL_TRIPS_NONE, cdev,
 692                                                 THERMAL_NO_LIMIT,
 693                                                 THERMAL_NO_LIMIT);
 694                 }
 695                 mutex_unlock(&thermal_list_lock);
 696                 if (!tz->passive_delay)
 697                         tz->passive_delay = 1000;
 698         } else if (!state && tz->forced_passive) {
 699                 mutex_lock(&thermal_list_lock);
 700                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 701                         if (!strncmp("Processor", cdev->type,
 702                                      sizeof("Processor")))
 703                                 thermal_zone_unbind_cooling_device(tz,
 704                                                                    THERMAL_TRIPS_NONE,
 705                                                                    cdev);
 706                 }
 707                 mutex_unlock(&thermal_list_lock);
 708                 tz->passive_delay = 0;
 709         }
 710
 711         tz->forced_passive = state;
 712
 713         thermal_zone_device_update(tz);
 714
 715         return count;
 716 }
 717
 718 static ssize_t
 719 passive_show(struct device *dev, struct device_attribute *attr,
 720                    char *buf)
 721 {
 722         struct thermal_zone_device *tz = to_thermal_zone(dev);
 723
 724         return sprintf(buf, "%d\n", tz->forced_passive);
 725 }
 726
 727 static ssize_t
 728 policy_store(struct device *dev, struct device_attribute *attr,
 729                     const char *buf, size_t count)
 730 {
 731         int ret = -EINVAL;
 732         struct thermal_zone_device *tz = to_thermal_zone(dev);
 733         struct thermal_governor *gov;
 734         char name[THERMAL_NAME_LENGTH];
 735
 736         snprintf(name, sizeof(name), "%s", buf);
 737
 738         mutex_lock(&thermal_governor_lock);
 739
 740         gov = __find_governor(strim(name));
 741         if (!gov)
 742                 goto exit;
 743
 744         tz->governor = gov;
 745         ret = count;
 746
 747 exit:
 748         mutex_unlock(&thermal_governor_lock);
 749         return ret;
 750 }
 751
 752 static ssize_t
 753 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 754 {
 755         struct thermal_zone_device *tz = to_thermal_zone(dev);
 756
 757         return sprintf(buf, "%s\n", tz->governor->name);
 758 }
 759
 760 #ifdef CONFIG_THERMAL_EMULATION
 761 static ssize_t
 762 emul_temp_store(struct device *dev, struct device_attribute *attr,
 763                      const char *buf, size_t count)
 764 {
 765         struct thermal_zone_device *tz = to_thermal_zone(dev);
 766         int ret = 0;
 767         unsigned long temperature;
 768
 769         if (kstrtoul(buf, 10, &temperature))
 770                 return -EINVAL;
 771
 772         if (!tz->ops->set_emul_temp) {
 773                 mutex_lock(&tz->lock);
 774                 tz->emul_temperature = temperature;
 775                 mutex_unlock(&tz->lock);
 776         } else {
 777                 ret = tz->ops->set_emul_temp(tz, temperature);
 778         }
 779
 780         return ret ? ret : count;
 781 }
 782 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 783 #endif/*CONFIG_THERMAL_EMULATION*/
 784
 785 static DEVICE_ATTR(type, 0444, type_show, NULL);
 786 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 787 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 788 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 789 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 790
 791 /* sys I/F for cooling device */
 792 #define to_cooling_device(_dev) \
 793         container_of(_dev, struct thermal_cooling_device, device)
 794
 795 static ssize_t
 796 thermal_cooling_device_type_show(struct device *dev,
 797                                  struct device_attribute *attr, char *buf)
 798 {
 799         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 800
 801         return sprintf(buf, "%s\n", cdev->type);
 802 }
 803
 804 static ssize_t
 805 thermal_cooling_device_max_state_show(struct device *dev,
 806                                       struct device_attribute *attr, char *buf)
 807 {
 808         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 809         unsigned long state;
 810         int ret;
 811
 812         ret = cdev->ops->get_max_state(cdev, &state);
 813         if (ret)
 814                 return ret;
 815         return sprintf(buf, "%ld\n", state);
 816 }
 817
 818 static ssize_t
 819 thermal_cooling_device_cur_state_show(struct device *dev,
 820                                       struct device_attribute *attr, char *buf)
 821 {
 822         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 823         unsigned long state;
 824         int ret;
 825
 826         ret = cdev->ops->get_cur_state(cdev, &state);
 827         if (ret)
 828                 return ret;
 829         return sprintf(buf, "%ld\n", state);
 830 }
 831
 832 static ssize_t
 833 thermal_cooling_device_cur_state_store(struct device *dev,
 834                                        struct device_attribute *attr,
 835                                        const char *buf, size_t count)
 836 {
 837         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 838         unsigned long state;
 839         int result;
 840
 841         if (!sscanf(buf, "%ld\n", &state))
 842                 return -EINVAL;
 843
 844         if ((long)state < 0)
 845                 return -EINVAL;
 846
 847         result = cdev->ops->set_cur_state(cdev, state);
 848         if (result)
 849                 return result;
 850         return count;
 851 }
 852
 853 static struct device_attribute dev_attr_cdev_type =
 854 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 855 static DEVICE_ATTR(max_state, 0444,
 856                    thermal_cooling_device_max_state_show, NULL);
 857 static DEVICE_ATTR(cur_state, 0644,
 858                    thermal_cooling_device_cur_state_show,
 859                    thermal_cooling_device_cur_state_store);
 860
 861 static ssize_t
 862 thermal_cooling_device_trip_point_show(struct device *dev,
 863                                        struct device_attribute *attr, char *buf)
 864 {
 865         struct thermal_instance *instance;
 866
 867         instance =
 868             container_of(attr, struct thermal_instance, attr);
 869
 870         if (instance->trip == THERMAL_TRIPS_NONE)
 871                 return sprintf(buf, "-1\n");
 872         else
 873                 return sprintf(buf, "%d\n", instance->trip);
 874 }
 875
 876 /* Device management */
 877
 878 /**
 879  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
 880  * @tz:         pointer to struct thermal_zone_device
 881  * @trip:       indicates which trip point the cooling devices is
 882  *              associated with in this thermal zone.
 883  * @cdev:       pointer to struct thermal_cooling_device
 884  * @upper:      the Maximum cooling state for this trip point.
 885  *              THERMAL_NO_LIMIT means no upper limit,
 886  *              and the cooling device can be in max_state.
 887  * @lower:      the Minimum cooling state can be used for this trip point.
 888  *              THERMAL_NO_LIMIT means no lower limit,
 889  *              and the cooling device can be in cooling state 0.
 890  *
 891  * This interface function bind a thermal cooling device to the certain trip
 892  * point of a thermal zone device.
 893  * This function is usually called in the thermal zone device .bind callback.
 894  *
 895  * Return: 0 on success, the proper error value otherwise.
 896  */
 897 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 898                                      int trip,
 899                                      struct thermal_cooling_device *cdev,
 900                                      unsigned long upper, unsigned long lower)
 901 {
 902         struct thermal_instance *dev;
 903         struct thermal_instance *pos;
 904         struct thermal_zone_device *pos1;
 905         struct thermal_cooling_device *pos2;
 906         unsigned long max_state;
 907         int result;
 908
 909         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 910                 return -EINVAL;
 911
 912         list_for_each_entry(pos1, &thermal_tz_list, node) {
 913                 if (pos1 == tz)
 914                         break;
 915         }
 916         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 917                 if (pos2 == cdev)
 918                         break;
 919         }
 920
 921         if (tz != pos1 || cdev != pos2)
 922                 return -EINVAL;
 923
 924         cdev->ops->get_max_state(cdev, &max_state);
 925
 926         /* lower default 0, upper default max_state */
 927         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 928         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 929
 930         if (lower > upper || upper > max_state)
 931                 return -EINVAL;
 932
 933         dev =
 934             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 935         if (!dev)
 936                 return -ENOMEM;
 937         dev->tz = tz;
 938         dev->cdev = cdev;
 939         dev->trip = trip;
 940         dev->upper = upper;
 941         dev->lower = lower;
 942         dev->target = THERMAL_NO_TARGET;
 943
 944         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 945         if (result)
 946                 goto free_mem;
 947
 948         sprintf(dev->name, "cdev%d", dev->id);
 949         result =
 950             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 951         if (result)
 952                 goto release_idr;
 953
 954         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 955         sysfs_attr_init(&dev->attr.attr);
 956         dev->attr.attr.name = dev->attr_name;
 957         dev->attr.attr.mode = 0444;
 958         dev->attr.show = thermal_cooling_device_trip_point_show;
 959         result = device_create_file(&tz->device, &dev->attr);
 960         if (result)
 961                 goto remove_symbol_link;
 962
 963         mutex_lock(&tz->lock);
 964         mutex_lock(&cdev->lock);
 965         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 966             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 967                 result = -EEXIST;
 968                 break;
 969         }
 970         if (!result) {
 971                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 972                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 973         }
 974         mutex_unlock(&cdev->lock);
 975         mutex_unlock(&tz->lock);
 976
 977         if (!result)
 978                 return 0;
 979
 980         device_remove_file(&tz->device, &dev->attr);
 981 remove_symbol_link:
 982         sysfs_remove_link(&tz->device.kobj, dev->name);
 983 release_idr:
 984         release_idr(&tz->idr, &tz->lock, dev->id);
 985 free_mem:
 986         kfree(dev);
 987         return result;
 988 }
 989 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
 990
 991 /**
 992  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
 993  *                                        thermal zone.
 994  * @tz:         pointer to a struct thermal_zone_device.
 995  * @trip:       indicates which trip point the cooling devices is
 996  *              associated with in this thermal zone.
 997  * @cdev:       pointer to a struct thermal_cooling_device.
 998  *
 999  * This interface function unbind a thermal cooling device from the certain
1000  * trip point of a thermal zone device.
1001  * This function is usually called in the thermal zone device .unbind callback.
1002  *
1003  * Return: 0 on success, the proper error value otherwise.
1004  */
1005 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1006                                        int trip,
1007                                        struct thermal_cooling_device *cdev)
1008 {
1009         struct thermal_instance *pos, *next;
1010
1011         mutex_lock(&tz->lock);
1012         mutex_lock(&cdev->lock);
1013         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1014                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1015                         list_del(&pos->tz_node);
1016                         list_del(&pos->cdev_node);
1017                         mutex_unlock(&cdev->lock);
1018                         mutex_unlock(&tz->lock);
1019                         goto unbind;
1020                 }
1021         }
1022         mutex_unlock(&cdev->lock);
1023         mutex_unlock(&tz->lock);
1024
1025         return -ENODEV;
1026
1027 unbind:
1028         device_remove_file(&tz->device, &pos->attr);
1029         sysfs_remove_link(&tz->device.kobj, pos->name);
1030         release_idr(&tz->idr, &tz->lock, pos->id);
1031         kfree(pos);
1032         return 0;
1033 }
1034 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1035
1036 static void thermal_release(struct device *dev)
1037 {
1038         struct thermal_zone_device *tz;
1039         struct thermal_cooling_device *cdev;
1040
1041         if (!strncmp(dev_name(dev), "thermal_zone",
1042                      sizeof("thermal_zone") - 1)) {
1043                 tz = to_thermal_zone(dev);
1044                 kfree(tz);
1045         } else if(!strncmp(dev_name(dev), "cooling_device",
1046                         sizeof("cooling_device") - 1)){
1047                 cdev = to_cooling_device(dev);
1048                 kfree(cdev);
1049         }
1050 }
1051
1052 static struct class thermal_class = {
1053         .name = "thermal",
1054         .dev_release = thermal_release,
1055 };
1056
1057 /**
1058  * thermal_cooling_device_register() - register a new thermal cooling device
1059  * @type:       the thermal cooling device type.
1060  * @devdata:    device private data.
1061  * @ops:                standard thermal cooling devices callbacks.
1062  *
1063  * This interface function adds a new thermal cooling device (fan/processor/...)
1064  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1065  * to all the thermal zone devices registered at the same time.
1066  *
1067  * Return: a pointer to the created struct thermal_cooling_device or an
1068  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1069  */
1070 struct thermal_cooling_device *
1071 thermal_cooling_device_register(char *type, void *devdata,
1072                                 const struct thermal_cooling_device_ops *ops)
1073 {
1074         struct thermal_cooling_device *cdev;
1075         int result;
1076
1077         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1078                 return ERR_PTR(-EINVAL);
1079
1080         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1081             !ops->set_cur_state)
1082                 return ERR_PTR(-EINVAL);
1083
1084         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1085         if (!cdev)
1086                 return ERR_PTR(-ENOMEM);
1087
1088         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1089         if (result) {
1090                 kfree(cdev);
1091                 return ERR_PTR(result);
1092         }
1093
1094         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1095         mutex_init(&cdev->lock);
1096         INIT_LIST_HEAD(&cdev->thermal_instances);
1097         cdev->ops = ops;
1098         cdev->updated = true;
1099         cdev->device.class = &thermal_class;
1100         cdev->devdata = devdata;
1101         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1102         result = device_register(&cdev->device);
1103         if (result) {
1104                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1105                 kfree(cdev);
1106                 return ERR_PTR(result);
1107         }
1108
1109         /* sys I/F */
1110         if (type) {
1111                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1112                 if (result)
1113                         goto unregister;
1114         }
1115
1116         result = device_create_file(&cdev->device, &dev_attr_max_state);
1117         if (result)
1118                 goto unregister;
1119
1120         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1121         if (result)
1122                 goto unregister;
1123
1124         /* Add 'this' new cdev to the global cdev list */
1125         mutex_lock(&thermal_list_lock);
1126         list_add(&cdev->node, &thermal_cdev_list);
1127         mutex_unlock(&thermal_list_lock);
1128
1129         /* Update binding information for 'this' new cdev */
1130         bind_cdev(cdev);
1131
1132         return cdev;
1133
1134 unregister:
1135         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1136         device_unregister(&cdev->device);
1137         return ERR_PTR(result);
1138 }
1139 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1140
1141 /**
1142  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1143  * @cdev:       the thermal cooling device to remove.
1144  *
1145  * thermal_cooling_device_unregister() must be called when the device is no
1146  * longer needed.
1147  */
1148 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1149 {
1150         int i;
1151         const struct thermal_zone_params *tzp;
1152         struct thermal_zone_device *tz;
1153         struct thermal_cooling_device *pos = NULL;
1154
1155         if (!cdev)
1156                 return;
1157
1158         mutex_lock(&thermal_list_lock);
1159         list_for_each_entry(pos, &thermal_cdev_list, node)
1160             if (pos == cdev)
1161                 break;
1162         if (pos != cdev) {
1163                 /* thermal cooling device not found */
1164                 mutex_unlock(&thermal_list_lock);
1165                 return;
1166         }
1167         list_del(&cdev->node);
1168
1169         /* Unbind all thermal zones associated with 'this' cdev */
1170         list_for_each_entry(tz, &thermal_tz_list, node) {
1171                 if (tz->ops->unbind) {
1172                         tz->ops->unbind(tz, cdev);
1173                         continue;
1174                 }
1175
1176                 if (!tz->tzp || !tz->tzp->tbp)
1177                         continue;
1178
1179                 tzp = tz->tzp;
1180                 for (i = 0; i < tzp->num_tbps; i++) {
1181                         if (tzp->tbp[i].cdev == cdev) {
1182                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1183                                 tzp->tbp[i].cdev = NULL;
1184                         }
1185                 }
1186         }
1187
1188         mutex_unlock(&thermal_list_lock);
1189
1190         if (cdev->type[0])
1191                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1192         device_remove_file(&cdev->device, &dev_attr_max_state);
1193         device_remove_file(&cdev->device, &dev_attr_cur_state);
1194
1195         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1196         device_unregister(&cdev->device);
1197         return;
1198 }
1199 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1200
1201 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1202 {
1203         struct thermal_instance *instance;
1204         unsigned long target = 0;
1205
1206         /* cooling device is updated*/
1207         if (cdev->updated)
1208                 return;
1209
1210         mutex_lock(&cdev->lock);
1211         /* Make sure cdev enters the deepest cooling state */
1212         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1213                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1214                                 instance->tz->id, instance->target);
1215                 if (instance->target == THERMAL_NO_TARGET)
1216                         continue;
1217                 if (instance->target > target)
1218                         target = instance->target;
1219         }
1220         mutex_unlock(&cdev->lock);
1221         cdev->ops->set_cur_state(cdev, target);
1222         cdev->updated = true;
1223         dev_dbg(&cdev->device, "set to state %lu\n", target);
1224 }
1225 EXPORT_SYMBOL(thermal_cdev_update);
1226
1227 /**
1228  * thermal_notify_framework - Sensor drivers use this API to notify framework
1229  * @tz:         thermal zone device
1230  * @trip:       indicates which trip point has been crossed
1231  *
1232  * This function handles the trip events from sensor drivers. It starts
1233  * throttling the cooling devices according to the policy configured.
1234  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1235  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1236  * The throttling policy is based on the configured platform data; if no
1237  * platform data is provided, this uses the step_wise throttling policy.
1238  */
1239 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1240 {
1241         handle_thermal_trip(tz, trip);
1242 }
1243 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1244
1245 /**
1246  * create_trip_attrs() - create attributes for trip points
1247  * @tz:         the thermal zone device
1248  * @mask:       Writeable trip point bitmap.
1249  *
1250  * helper function to instantiate sysfs entries for every trip
1251  * point and its properties of a struct thermal_zone_device.
1252  *
1253  * Return: 0 on success, the proper error value otherwise.
1254  */
1255 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1256 {
1257         int indx;
1258         int size = sizeof(struct thermal_attr) * tz->trips;
1259
1260         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1261         if (!tz->trip_type_attrs)
1262                 return -ENOMEM;
1263
1264         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1265         if (!tz->trip_temp_attrs) {
1266                 kfree(tz->trip_type_attrs);
1267                 return -ENOMEM;
1268         }
1269
1270         if (tz->ops->get_trip_hyst) {
1271                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1272                 if (!tz->trip_hyst_attrs) {
1273                         kfree(tz->trip_type_attrs);
1274                         kfree(tz->trip_temp_attrs);
1275                         return -ENOMEM;
1276                 }
1277         }
1278
1279
1280         for (indx = 0; indx < tz->trips; indx++) {
1281                 /* create trip type attribute */
1282                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1283                          "trip_point_%d_type", indx);
1284
1285                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1286                 tz->trip_type_attrs[indx].attr.attr.name =
1287                                                 tz->trip_type_attrs[indx].name;
1288                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1289                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1290
1291                 device_create_file(&tz->device,
1292                                    &tz->trip_type_attrs[indx].attr);
1293
1294                 /* create trip temp attribute */
1295                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1296                          "trip_point_%d_temp", indx);
1297
1298                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1299                 tz->trip_temp_attrs[indx].attr.attr.name =
1300                                                 tz->trip_temp_attrs[indx].name;
1301                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1302                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1303                 if (mask & (1 << indx)) {
1304                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1305                         tz->trip_temp_attrs[indx].attr.store =
1306                                                         trip_point_temp_store;
1307                 }
1308
1309                 device_create_file(&tz->device,
1310                                    &tz->trip_temp_attrs[indx].attr);
1311
1312                 /* create Optional trip hyst attribute */
1313                 if (!tz->ops->get_trip_hyst)
1314                         continue;
1315                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1316                          "trip_point_%d_hyst", indx);
1317
1318                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1319                 tz->trip_hyst_attrs[indx].attr.attr.name =
1320                                         tz->trip_hyst_attrs[indx].name;
1321                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1322                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1323                 if (tz->ops->set_trip_hyst) {
1324                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1325                         tz->trip_hyst_attrs[indx].attr.store =
1326                                         trip_point_hyst_store;
1327                 }
1328
1329                 device_create_file(&tz->device,
1330                                    &tz->trip_hyst_attrs[indx].attr);
1331         }
1332         return 0;
1333 }
1334
1335 static void remove_trip_attrs(struct thermal_zone_device *tz)
1336 {
1337         int indx;
1338
1339         for (indx = 0; indx < tz->trips; indx++) {
1340                 device_remove_file(&tz->device,
1341                                    &tz->trip_type_attrs[indx].attr);
1342                 device_remove_file(&tz->device,
1343                                    &tz->trip_temp_attrs[indx].attr);
1344                 if (tz->ops->get_trip_hyst)
1345                         device_remove_file(&tz->device,
1346                                   &tz->trip_hyst_attrs[indx].attr);
1347         }
1348         kfree(tz->trip_type_attrs);
1349         kfree(tz->trip_temp_attrs);
1350         kfree(tz->trip_hyst_attrs);
1351 }
1352
1353 /**
1354  * thermal_zone_device_register() - register a new thermal zone device
1355  * @type:       the thermal zone device type
1356  * @trips:      the number of trip points the thermal zone support
1357  * @mask:       a bit string indicating the writeablility of trip points
1358  * @devdata:    private device data
1359  * @ops:        standard thermal zone device callbacks
1360  * @tzp:        thermal zone platform parameters
1361  * @passive_delay: number of milliseconds to wait between polls when
1362  *                 performing passive cooling
1363  * @polling_delay: number of milliseconds to wait between polls when checking
1364  *                 whether trip points have been crossed (0 for interrupt
1365  *                 driven systems)
1366  *
1367  * This interface function adds a new thermal zone device (sensor) to
1368  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1369  * thermal cooling devices registered at the same time.
1370  * thermal_zone_device_unregister() must be called when the device is no
1371  * longer needed. The passive cooling depends on the .get_trend() return value.
1372  *
1373  * Return: a pointer to the created struct thermal_zone_device or an
1374  * in case of error, an ERR_PTR. Caller must check return value with
1375  * IS_ERR*() helpers.
1376  */
1377 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1378         int trips, int mask, void *devdata,
1379         const struct thermal_zone_device_ops *ops,
1380         const struct thermal_zone_params *tzp,
1381         int passive_delay, int polling_delay)
1382 {
1383         struct thermal_zone_device *tz;
1384         enum thermal_trip_type trip_type;
1385         int result;
1386         int count;
1387         int passive = 0;
1388
1389         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1390                 return ERR_PTR(-EINVAL);
1391
1392         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1393                 return ERR_PTR(-EINVAL);
1394
1395         if (!ops || !ops->get_temp)
1396                 return ERR_PTR(-EINVAL);
1397
1398         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1399                 return ERR_PTR(-EINVAL);
1400
1401         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1402         if (!tz)
1403                 return ERR_PTR(-ENOMEM);
1404
1405         INIT_LIST_HEAD(&tz->thermal_instances);
1406         idr_init(&tz->idr);
1407         mutex_init(&tz->lock);
1408         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1409         if (result) {
1410                 kfree(tz);
1411                 return ERR_PTR(result);
1412         }
1413
1414         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1415         tz->ops = ops;
1416         tz->tzp = tzp;
1417         tz->device.class = &thermal_class;
1418         tz->devdata = devdata;
1419         tz->trips = trips;
1420         tz->passive_delay = passive_delay;
1421         tz->polling_delay = polling_delay;
1422
1423         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1424         result = device_register(&tz->device);
1425         if (result) {
1426                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1427                 kfree(tz);
1428                 return ERR_PTR(result);
1429         }
1430
1431         /* sys I/F */
1432         if (type) {
1433                 result = device_create_file(&tz->device, &dev_attr_type);
1434                 if (result)
1435                         goto unregister;
1436         }
1437
1438         result = device_create_file(&tz->device, &dev_attr_temp);
1439         if (result)
1440                 goto unregister;
1441
1442         if (ops->get_mode) {
1443                 result = device_create_file(&tz->device, &dev_attr_mode);
1444                 if (result)
1445                         goto unregister;
1446         }
1447
1448         result = create_trip_attrs(tz, mask);
1449         if (result)
1450                 goto unregister;
1451
1452         for (count = 0; count < trips; count++) {
1453                 tz->ops->get_trip_type(tz, count, &trip_type);
1454                 if (trip_type == THERMAL_TRIP_PASSIVE)
1455                         passive = 1;
1456         }
1457
1458         if (!passive) {
1459                 result = device_create_file(&tz->device, &dev_attr_passive);
1460                 if (result)
1461                         goto unregister;
1462         }
1463
1464 #ifdef CONFIG_THERMAL_EMULATION
1465         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1466         if (result)
1467                 goto unregister;
1468 #endif
1469         /* Create policy attribute */
1470         result = device_create_file(&tz->device, &dev_attr_policy);
1471         if (result)
1472                 goto unregister;
1473
1474         /* Update 'this' zone's governor information */
1475         mutex_lock(&thermal_governor_lock);
1476
1477         if (tz->tzp)
1478                 tz->governor = __find_governor(tz->tzp->governor_name);
1479         else
1480                 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1481
1482         mutex_unlock(&thermal_governor_lock);
1483
1484         if (!tz->tzp || !tz->tzp->no_hwmon) {
1485                 result = thermal_add_hwmon_sysfs(tz);
1486                 if (result)
1487                         goto unregister;
1488         }
1489
1490         mutex_lock(&thermal_list_lock);
1491         list_add_tail(&tz->node, &thermal_tz_list);
1492         mutex_unlock(&thermal_list_lock);
1493
1494         /* Bind cooling devices for this zone */
1495         bind_tz(tz);
1496
1497         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1498
1499         thermal_zone_device_update(tz);
1500
1501         if (!result)
1502                 return tz;
1503
1504 unregister:
1505         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1506         device_unregister(&tz->device);
1507         return ERR_PTR(result);
1508 }
1509 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1510
1511 /**
1512  * thermal_device_unregister - removes the registered thermal zone device
1513  * @tz: the thermal zone device to remove
1514  */
1515 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1516 {
1517         int i;
1518         const struct thermal_zone_params *tzp;
1519         struct thermal_cooling_device *cdev;
1520         struct thermal_zone_device *pos = NULL;
1521
1522         if (!tz)
1523                 return;
1524
1525         tzp = tz->tzp;
1526
1527         mutex_lock(&thermal_list_lock);
1528         list_for_each_entry(pos, &thermal_tz_list, node)
1529             if (pos == tz)
1530                 break;
1531         if (pos != tz) {
1532                 /* thermal zone device not found */
1533                 mutex_unlock(&thermal_list_lock);
1534                 return;
1535         }
1536         list_del(&tz->node);
1537
1538         /* Unbind all cdevs associated with 'this' thermal zone */
1539         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1540                 if (tz->ops->unbind) {
1541                         tz->ops->unbind(tz, cdev);
1542                         continue;
1543                 }
1544
1545                 if (!tzp || !tzp->tbp)
1546                         break;
1547
1548                 for (i = 0; i < tzp->num_tbps; i++) {
1549                         if (tzp->tbp[i].cdev == cdev) {
1550                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1551                                 tzp->tbp[i].cdev = NULL;
1552                         }
1553                 }
1554         }
1555
1556         mutex_unlock(&thermal_list_lock);
1557
1558         thermal_zone_device_set_polling(tz, 0);
1559
1560         if (tz->type[0])
1561                 device_remove_file(&tz->device, &dev_attr_type);
1562         device_remove_file(&tz->device, &dev_attr_temp);
1563         if (tz->ops->get_mode)
1564                 device_remove_file(&tz->device, &dev_attr_mode);
1565         device_remove_file(&tz->device, &dev_attr_policy);
1566         remove_trip_attrs(tz);
1567         tz->governor = NULL;
1568
1569         thermal_remove_hwmon_sysfs(tz);
1570         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1571         idr_destroy(&tz->idr);
1572         mutex_destroy(&tz->lock);
1573         device_unregister(&tz->device);
1574         return;
1575 }
1576 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1577
1578 /**
1579  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1580  * @name: thermal zone name to fetch the temperature
1581  *
1582  * When only one zone is found with the passed name, returns a reference to it.
1583  *
1584  * Return: On success returns a reference to an unique thermal zone with
1585  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1586  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1587  */
1588 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1589 {
1590         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1591         unsigned int found = 0;
1592
1593         if (!name)
1594                 goto exit;
1595
1596         mutex_lock(&thermal_list_lock);
1597         list_for_each_entry(pos, &thermal_tz_list, node)
1598                 if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1599                         found++;
1600                         ref = pos;
1601                 }
1602         mutex_unlock(&thermal_list_lock);
1603
1604         /* nothing has been found, thus an error code for it */
1605         if (found == 0)
1606                 ref = ERR_PTR(-ENODEV);
1607         else if (found > 1)
1608         /* Success only when an unique zone is found */
1609                 ref = ERR_PTR(-EEXIST);
1610
1611 exit:
1612         return ref;
1613 }
1614 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1615
1616 #ifdef CONFIG_NET
1617 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1618         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1619 };
1620
1621 static struct genl_family thermal_event_genl_family = {
1622         .id = GENL_ID_GENERATE,
1623         .name = THERMAL_GENL_FAMILY_NAME,
1624         .version = THERMAL_GENL_VERSION,
1625         .maxattr = THERMAL_GENL_ATTR_MAX,
1626         .mcgrps = thermal_event_mcgrps,
1627         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1628 };
1629
1630 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1631                                         enum events event)
1632 {
1633         struct sk_buff *skb;
1634         struct nlattr *attr;
1635         struct thermal_genl_event *thermal_event;
1636         void *msg_header;
1637         int size;
1638         int result;
1639         static unsigned int thermal_event_seqnum;
1640
1641         if (!tz)
1642                 return -EINVAL;
1643
1644         /* allocate memory */
1645         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1646                nla_total_size(0);
1647
1648         skb = genlmsg_new(size, GFP_ATOMIC);
1649         if (!skb)
1650                 return -ENOMEM;
1651
1652         /* add the genetlink message header */
1653         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1654                                  &thermal_event_genl_family, 0,
1655                                  THERMAL_GENL_CMD_EVENT);
1656         if (!msg_header) {
1657                 nlmsg_free(skb);
1658                 return -ENOMEM;
1659         }
1660
1661         /* fill the data */
1662         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1663                            sizeof(struct thermal_genl_event));
1664
1665         if (!attr) {
1666                 nlmsg_free(skb);
1667                 return -EINVAL;
1668         }
1669
1670         thermal_event = nla_data(attr);
1671         if (!thermal_event) {
1672                 nlmsg_free(skb);
1673                 return -EINVAL;
1674         }
1675
1676         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1677
1678         thermal_event->orig = tz->id;
1679         thermal_event->event = event;
1680
1681         /* send multicast genetlink message */
1682         result = genlmsg_end(skb, msg_header);
1683         if (result < 0) {
1684                 nlmsg_free(skb);
1685                 return result;
1686         }
1687
1688         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1689                                    0, GFP_ATOMIC);
1690         if (result)
1691                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1692
1693         return result;
1694 }
1695 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1696
1697 static int genetlink_init(void)
1698 {
1699         return genl_register_family(&thermal_event_genl_family);
1700 }
1701
1702 static void genetlink_exit(void)
1703 {
1704         genl_unregister_family(&thermal_event_genl_family);
1705 }
1706 #else /* !CONFIG_NET */
1707 static inline int genetlink_init(void) { return 0; }
1708 static inline void genetlink_exit(void) {}
1709 #endif /* !CONFIG_NET */
1710
1711 static int __init thermal_register_governors(void)
1712 {
1713         int result;
1714
1715         result = thermal_gov_step_wise_register();
1716         if (result)
1717                 return result;
1718
1719         result = thermal_gov_fair_share_register();
1720         if (result)
1721                 return result;
1722
1723         return thermal_gov_user_space_register();
1724 }
1725
1726 static void thermal_unregister_governors(void)
1727 {
1728         thermal_gov_step_wise_unregister();
1729         thermal_gov_fair_share_unregister();
1730         thermal_gov_user_space_unregister();
1731 }
1732
1733 static int __init thermal_init(void)
1734 {
1735         int result;
1736
1737         result = thermal_register_governors();
1738         if (result)
1739                 goto error;
1740
1741         result = class_register(&thermal_class);
1742         if (result)
1743                 goto unregister_governors;
1744
1745         result = genetlink_init();
1746         if (result)
1747                 goto unregister_class;
1748
1749         return 0;
1750
1751 unregister_governors:
1752         thermal_unregister_governors();
1753 unregister_class:
1754         class_unregister(&thermal_class);
1755 error:
1756         idr_destroy(&thermal_tz_idr);
1757         idr_destroy(&thermal_cdev_idr);
1758         mutex_destroy(&thermal_idr_lock);
1759         mutex_destroy(&thermal_list_lock);
1760         mutex_destroy(&thermal_governor_lock);
1761         return result;
1762 }
1763
1764 static void __exit thermal_exit(void)
1765 {
1766         genetlink_exit();
1767         class_unregister(&thermal_class);
1768         thermal_unregister_governors();
1769         idr_destroy(&thermal_tz_idr);
1770         idr_destroy(&thermal_cdev_idr);
1771         mutex_destroy(&thermal_idr_lock);
1772         mutex_destroy(&thermal_list_lock);
1773         mutex_destroy(&thermal_governor_lock);
1774 }
1775
1776 fs_initcall(thermal_init);
1777 module_exit(thermal_exit);