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
  41 #define CREATE_TRACE_POINTS
  42 #include <trace/events/thermal.h>
  43
  44 #include "thermal_core.h"
  45 #include "thermal_hwmon.h"
  46
  47 MODULE_AUTHOR("Zhang Rui");
  48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  49 MODULE_LICENSE("GPL v2");
  50
  51 static DEFINE_IDR(thermal_tz_idr);
  52 static DEFINE_IDR(thermal_cdev_idr);
  53 static DEFINE_MUTEX(thermal_idr_lock);
  54
  55 static LIST_HEAD(thermal_tz_list);
  56 static LIST_HEAD(thermal_cdev_list);
  57 static LIST_HEAD(thermal_governor_list);
  58
  59 static DEFINE_MUTEX(thermal_list_lock);
  60 static DEFINE_MUTEX(thermal_governor_lock);
  61
  62 static struct thermal_governor *def_governor;
  63
  64 static struct thermal_governor *__find_governor(const char *name)
  65 {
  66         struct thermal_governor *pos;
  67
  68         if (!name || !name[0])
  69                 return def_governor;
  70
  71         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  72                 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
  73                         return pos;
  74
  75         return NULL;
  76 }
  77
  78 int thermal_register_governor(struct thermal_governor *governor)
  79 {
  80         int err;
  81         const char *name;
  82         struct thermal_zone_device *pos;
  83
  84         if (!governor)
  85                 return -EINVAL;
  86
  87         mutex_lock(&thermal_governor_lock);
  88
  89         err = -EBUSY;
  90         if (__find_governor(governor->name) == NULL) {
  91                 err = 0;
  92                 list_add(&governor->governor_list, &thermal_governor_list);
  93                 if (!def_governor && !strncmp(governor->name,
  94                         DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
  95                         def_governor = governor;
  96         }
  97
  98         mutex_lock(&thermal_list_lock);
  99
 100         list_for_each_entry(pos, &thermal_tz_list, node) {
 101                 /*
 102                  * only thermal zones with specified tz->tzp->governor_name
 103                  * may run with tz->govenor unset
 104                  */
 105                 if (pos->governor)
 106                         continue;
 107
 108                 name = pos->tzp->governor_name;
 109
 110                 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
 111                         pos->governor = governor;
 112         }
 113
 114         mutex_unlock(&thermal_list_lock);
 115         mutex_unlock(&thermal_governor_lock);
 116
 117         return err;
 118 }
 119
 120 void thermal_unregister_governor(struct thermal_governor *governor)
 121 {
 122         struct thermal_zone_device *pos;
 123
 124         if (!governor)
 125                 return;
 126
 127         mutex_lock(&thermal_governor_lock);
 128
 129         if (__find_governor(governor->name) == NULL)
 130                 goto exit;
 131
 132         mutex_lock(&thermal_list_lock);
 133
 134         list_for_each_entry(pos, &thermal_tz_list, node) {
 135                 if (!strnicmp(pos->governor->name, governor->name,
 136                                                 THERMAL_NAME_LENGTH))
 137                         pos->governor = NULL;
 138         }
 139
 140         mutex_unlock(&thermal_list_lock);
 141         list_del(&governor->governor_list);
 142 exit:
 143         mutex_unlock(&thermal_governor_lock);
 144         return;
 145 }
 146
 147 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 148 {
 149         int ret;
 150
 151         if (lock)
 152                 mutex_lock(lock);
 153         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 154         if (lock)
 155                 mutex_unlock(lock);
 156         if (unlikely(ret < 0))
 157                 return ret;
 158         *id = ret;
 159         return 0;
 160 }
 161
 162 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 163 {
 164         if (lock)
 165                 mutex_lock(lock);
 166         idr_remove(idr, id);
 167         if (lock)
 168                 mutex_unlock(lock);
 169 }
 170
 171 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 172 {
 173         enum thermal_trend trend;
 174
 175         if (tz->emul_temperature || !tz->ops->get_trend ||
 176             tz->ops->get_trend(tz, trip, &trend)) {
 177                 if (tz->temperature > tz->last_temperature)
 178                         trend = THERMAL_TREND_RAISING;
 179                 else if (tz->temperature < tz->last_temperature)
 180                         trend = THERMAL_TREND_DROPPING;
 181                 else
 182                         trend = THERMAL_TREND_STABLE;
 183         }
 184
 185         return trend;
 186 }
 187 EXPORT_SYMBOL(get_tz_trend);
 188
 189 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 190                         struct thermal_cooling_device *cdev, int trip)
 191 {
 192         struct thermal_instance *pos = NULL;
 193         struct thermal_instance *target_instance = NULL;
 194
 195         mutex_lock(&tz->lock);
 196         mutex_lock(&cdev->lock);
 197
 198         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 199                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 200                         target_instance = pos;
 201                         break;
 202                 }
 203         }
 204
 205         mutex_unlock(&cdev->lock);
 206         mutex_unlock(&tz->lock);
 207
 208         return target_instance;
 209 }
 210 EXPORT_SYMBOL(get_thermal_instance);
 211
 212 static void print_bind_err_msg(struct thermal_zone_device *tz,
 213                         struct thermal_cooling_device *cdev, int ret)
 214 {
 215         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 216                                 tz->type, cdev->type, ret);
 217 }
 218
 219 static void __bind(struct thermal_zone_device *tz, int mask,
 220                         struct thermal_cooling_device *cdev,
 221                         unsigned long *limits)
 222 {
 223         int i, ret;
 224
 225         for (i = 0; i < tz->trips; i++) {
 226                 if (mask & (1 << i)) {
 227                         unsigned long upper, lower;
 228
 229                         upper = THERMAL_NO_LIMIT;
 230                         lower = THERMAL_NO_LIMIT;
 231                         if (limits) {
 232                                 lower = limits[i * 2];
 233                                 upper = limits[i * 2 + 1];
 234                         }
 235                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 236                                                                upper, lower);
 237                         if (ret)
 238                                 print_bind_err_msg(tz, cdev, ret);
 239                 }
 240         }
 241 }
 242
 243 static void __unbind(struct thermal_zone_device *tz, int mask,
 244                         struct thermal_cooling_device *cdev)
 245 {
 246         int i;
 247
 248         for (i = 0; i < tz->trips; i++)
 249                 if (mask & (1 << i))
 250                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 251 }
 252
 253 static void bind_cdev(struct thermal_cooling_device *cdev)
 254 {
 255         int i, ret;
 256         const struct thermal_zone_params *tzp;
 257         struct thermal_zone_device *pos = NULL;
 258
 259         mutex_lock(&thermal_list_lock);
 260
 261         list_for_each_entry(pos, &thermal_tz_list, node) {
 262                 if (!pos->tzp && !pos->ops->bind)
 263                         continue;
 264
 265                 if (pos->ops->bind) {
 266                         ret = pos->ops->bind(pos, cdev);
 267                         if (ret)
 268                                 print_bind_err_msg(pos, cdev, ret);
 269                         continue;
 270                 }
 271
 272                 tzp = pos->tzp;
 273                 if (!tzp || !tzp->tbp)
 274                         continue;
 275
 276                 for (i = 0; i < tzp->num_tbps; i++) {
 277                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 278                                 continue;
 279                         if (tzp->tbp[i].match(pos, cdev))
 280                                 continue;
 281                         tzp->tbp[i].cdev = cdev;
 282                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 283                                tzp->tbp[i].binding_limits);
 284                 }
 285         }
 286
 287         mutex_unlock(&thermal_list_lock);
 288 }
 289
 290 static void bind_tz(struct thermal_zone_device *tz)
 291 {
 292         int i, ret;
 293         struct thermal_cooling_device *pos = NULL;
 294         const struct thermal_zone_params *tzp = tz->tzp;
 295
 296         if (!tzp && !tz->ops->bind)
 297                 return;
 298
 299         mutex_lock(&thermal_list_lock);
 300
 301         /* If there is ops->bind, try to use ops->bind */
 302         if (tz->ops->bind) {
 303                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 304                         ret = tz->ops->bind(tz, pos);
 305                         if (ret)
 306                                 print_bind_err_msg(tz, pos, ret);
 307                 }
 308                 goto exit;
 309         }
 310
 311         if (!tzp || !tzp->tbp)
 312                 goto exit;
 313
 314         list_for_each_entry(pos, &thermal_cdev_list, node) {
 315                 for (i = 0; i < tzp->num_tbps; i++) {
 316                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 317                                 continue;
 318                         if (tzp->tbp[i].match(tz, pos))
 319                                 continue;
 320                         tzp->tbp[i].cdev = pos;
 321                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 322                                tzp->tbp[i].binding_limits);
 323                 }
 324         }
 325 exit:
 326         mutex_unlock(&thermal_list_lock);
 327 }
 328
 329 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 330                                             int delay)
 331 {
 332         if (delay > 1000)
 333                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 334                                  round_jiffies(msecs_to_jiffies(delay)));
 335         else if (delay)
 336                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 337                                  msecs_to_jiffies(delay));
 338         else
 339                 cancel_delayed_work(&tz->poll_queue);
 340 }
 341
 342 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 343 {
 344         mutex_lock(&tz->lock);
 345
 346         if (tz->passive)
 347                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 348         else if (tz->polling_delay)
 349                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 350         else
 351                 thermal_zone_device_set_polling(tz, 0);
 352
 353         mutex_unlock(&tz->lock);
 354 }
 355
 356 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 357                         int trip, enum thermal_trip_type trip_type)
 358 {
 359         tz->governor ? tz->governor->throttle(tz, trip) :
 360                        def_governor->throttle(tz, trip);
 361 }
 362
 363 static void handle_critical_trips(struct thermal_zone_device *tz,
 364                                 int trip, enum thermal_trip_type trip_type)
 365 {
 366         long trip_temp;
 367
 368         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 369
 370         /* If we have not crossed the trip_temp, we do not care. */
 371         if (tz->temperature < trip_temp)
 372                 return;
 373
 374         if (tz->ops->notify)
 375                 tz->ops->notify(tz, trip, trip_type);
 376
 377         if (trip_type == THERMAL_TRIP_CRITICAL) {
 378                 dev_emerg(&tz->device,
 379                           "critical temperature reached(%d C),shutting down\n",
 380                           tz->temperature / 1000);
 381                 orderly_poweroff(true);
 382         }
 383 }
 384
 385 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 386 {
 387         enum thermal_trip_type type;
 388
 389         tz->ops->get_trip_type(tz, trip, &type);
 390
 391         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 392                 handle_critical_trips(tz, trip, type);
 393         else
 394                 handle_non_critical_trips(tz, trip, type);
 395         /*
 396          * Alright, we handled this trip successfully.
 397          * So, start monitoring again.
 398          */
 399         monitor_thermal_zone(tz);
 400 }
 401
 402 /**
 403  * thermal_zone_get_temp() - returns its the temperature of thermal zone
 404  * @tz: a valid pointer to a struct thermal_zone_device
 405  * @temp: a valid pointer to where to store the resulting temperature.
 406  *
 407  * When a valid thermal zone reference is passed, it will fetch its
 408  * temperature and fill @temp.
 409  *
 410  * Return: On success returns 0, an error code otherwise
 411  */
 412 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 413 {
 414         int ret = -EINVAL;
 415 #ifdef CONFIG_THERMAL_EMULATION
 416         int count;
 417         unsigned long crit_temp = -1UL;
 418         enum thermal_trip_type type;
 419 #endif
 420
 421         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 422                 goto exit;
 423
 424         mutex_lock(&tz->lock);
 425
 426         ret = tz->ops->get_temp(tz, temp);
 427 #ifdef CONFIG_THERMAL_EMULATION
 428         if (!tz->emul_temperature)
 429                 goto skip_emul;
 430
 431         for (count = 0; count < tz->trips; count++) {
 432                 ret = tz->ops->get_trip_type(tz, count, &type);
 433                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 434                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 435                         break;
 436                 }
 437         }
 438
 439         if (ret)
 440                 goto skip_emul;
 441
 442         if (*temp < crit_temp)
 443                 *temp = tz->emul_temperature;
 444 skip_emul:
 445 #endif
 446         mutex_unlock(&tz->lock);
 447 exit:
 448         return ret;
 449 }
 450 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 451
 452 static void update_temperature(struct thermal_zone_device *tz)
 453 {
 454         long temp;
 455         int ret;
 456
 457         ret = thermal_zone_get_temp(tz, &temp);
 458         if (ret) {
 459                 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
 460                          tz->id);
 461                 return;
 462         }
 463
 464         mutex_lock(&tz->lock);
 465         tz->last_temperature = tz->temperature;
 466         tz->temperature = temp;
 467         mutex_unlock(&tz->lock);
 468
 469         trace_thermal_temperature(tz);
 470         dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 471                                 tz->last_temperature, tz->temperature);
 472 }
 473
 474 void thermal_zone_device_update(struct thermal_zone_device *tz)
 475 {
 476         int count;
 477
 478         if (!tz->ops->get_temp)
 479                 return;
 480
 481         update_temperature(tz);
 482
 483         for (count = 0; count < tz->trips; count++)
 484                 handle_thermal_trip(tz, count);
 485 }
 486 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 487
 488 static void thermal_zone_device_check(struct work_struct *work)
 489 {
 490         struct thermal_zone_device *tz = container_of(work, struct
 491                                                       thermal_zone_device,
 492                                                       poll_queue.work);
 493         thermal_zone_device_update(tz);
 494 }
 495
 496 /* sys I/F for thermal zone */
 497
 498 #define to_thermal_zone(_dev) \
 499         container_of(_dev, struct thermal_zone_device, device)
 500
 501 static ssize_t
 502 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 503 {
 504         struct thermal_zone_device *tz = to_thermal_zone(dev);
 505
 506         return sprintf(buf, "%s\n", tz->type);
 507 }
 508
 509 static ssize_t
 510 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 511 {
 512         struct thermal_zone_device *tz = to_thermal_zone(dev);
 513         long temperature;
 514         int ret;
 515
 516         ret = thermal_zone_get_temp(tz, &temperature);
 517
 518         if (ret)
 519                 return ret;
 520
 521         return sprintf(buf, "%ld\n", temperature);
 522 }
 523
 524 static ssize_t
 525 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 526 {
 527         struct thermal_zone_device *tz = to_thermal_zone(dev);
 528         enum thermal_device_mode mode;
 529         int result;
 530
 531         if (!tz->ops->get_mode)
 532                 return -EPERM;
 533
 534         result = tz->ops->get_mode(tz, &mode);
 535         if (result)
 536                 return result;
 537
 538         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 539                        : "disabled");
 540 }
 541
 542 static ssize_t
 543 mode_store(struct device *dev, struct device_attribute *attr,
 544            const char *buf, size_t count)
 545 {
 546         struct thermal_zone_device *tz = to_thermal_zone(dev);
 547         int result;
 548
 549         if (!tz->ops->set_mode)
 550                 return -EPERM;
 551
 552         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 553                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 554         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 555                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 556         else
 557                 result = -EINVAL;
 558
 559         if (result)
 560                 return result;
 561
 562         return count;
 563 }
 564
 565 static ssize_t
 566 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 567                      char *buf)
 568 {
 569         struct thermal_zone_device *tz = to_thermal_zone(dev);
 570         enum thermal_trip_type type;
 571         int trip, result;
 572
 573         if (!tz->ops->get_trip_type)
 574                 return -EPERM;
 575
 576         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 577                 return -EINVAL;
 578
 579         result = tz->ops->get_trip_type(tz, trip, &type);
 580         if (result)
 581                 return result;
 582
 583         switch (type) {
 584         case THERMAL_TRIP_CRITICAL:
 585                 return sprintf(buf, "critical\n");
 586         case THERMAL_TRIP_HOT:
 587                 return sprintf(buf, "hot\n");
 588         case THERMAL_TRIP_PASSIVE:
 589                 return sprintf(buf, "passive\n");
 590         case THERMAL_TRIP_ACTIVE:
 591                 return sprintf(buf, "active\n");
 592         default:
 593                 return sprintf(buf, "unknown\n");
 594         }
 595 }
 596
 597 static ssize_t
 598 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 599                      const char *buf, size_t count)
 600 {
 601         struct thermal_zone_device *tz = to_thermal_zone(dev);
 602         int trip, ret;
 603         unsigned long temperature;
 604
 605         if (!tz->ops->set_trip_temp)
 606                 return -EPERM;
 607
 608         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 609                 return -EINVAL;
 610
 611         if (kstrtoul(buf, 10, &temperature))
 612                 return -EINVAL;
 613
 614         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 615
 616         return ret ? ret : count;
 617 }
 618
 619 static ssize_t
 620 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 621                      char *buf)
 622 {
 623         struct thermal_zone_device *tz = to_thermal_zone(dev);
 624         int trip, ret;
 625         long temperature;
 626
 627         if (!tz->ops->get_trip_temp)
 628                 return -EPERM;
 629
 630         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 631                 return -EINVAL;
 632
 633         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 634
 635         if (ret)
 636                 return ret;
 637
 638         return sprintf(buf, "%ld\n", temperature);
 639 }
 640
 641 static ssize_t
 642 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 643                         const char *buf, size_t count)
 644 {
 645         struct thermal_zone_device *tz = to_thermal_zone(dev);
 646         int trip, ret;
 647         unsigned long temperature;
 648
 649         if (!tz->ops->set_trip_hyst)
 650                 return -EPERM;
 651
 652         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 653                 return -EINVAL;
 654
 655         if (kstrtoul(buf, 10, &temperature))
 656                 return -EINVAL;
 657
 658         /*
 659          * We are not doing any check on the 'temperature' value
 660          * here. The driver implementing 'set_trip_hyst' has to
 661          * take care of this.
 662          */
 663         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 664
 665         return ret ? ret : count;
 666 }
 667
 668 static ssize_t
 669 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 670                         char *buf)
 671 {
 672         struct thermal_zone_device *tz = to_thermal_zone(dev);
 673         int trip, ret;
 674         unsigned long temperature;
 675
 676         if (!tz->ops->get_trip_hyst)
 677                 return -EPERM;
 678
 679         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 680                 return -EINVAL;
 681
 682         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 683
 684         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 685 }
 686
 687 static ssize_t
 688 passive_store(struct device *dev, struct device_attribute *attr,
 689                     const char *buf, size_t count)
 690 {
 691         struct thermal_zone_device *tz = to_thermal_zone(dev);
 692         struct thermal_cooling_device *cdev = NULL;
 693         int state;
 694
 695         if (!sscanf(buf, "%d\n", &state))
 696                 return -EINVAL;
 697
 698         /* sanity check: values below 1000 millicelcius don't make sense
 699          * and can cause the system to go into a thermal heart attack
 700          */
 701         if (state && state < 1000)
 702                 return -EINVAL;
 703
 704         if (state && !tz->forced_passive) {
 705                 mutex_lock(&thermal_list_lock);
 706                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 707                         if (!strncmp("Processor", cdev->type,
 708                                      sizeof("Processor")))
 709                                 thermal_zone_bind_cooling_device(tz,
 710                                                 THERMAL_TRIPS_NONE, cdev,
 711                                                 THERMAL_NO_LIMIT,
 712                                                 THERMAL_NO_LIMIT);
 713                 }
 714                 mutex_unlock(&thermal_list_lock);
 715                 if (!tz->passive_delay)
 716                         tz->passive_delay = 1000;
 717         } else if (!state && tz->forced_passive) {
 718                 mutex_lock(&thermal_list_lock);
 719                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 720                         if (!strncmp("Processor", cdev->type,
 721                                      sizeof("Processor")))
 722                                 thermal_zone_unbind_cooling_device(tz,
 723                                                                    THERMAL_TRIPS_NONE,
 724                                                                    cdev);
 725                 }
 726                 mutex_unlock(&thermal_list_lock);
 727                 tz->passive_delay = 0;
 728         }
 729
 730         tz->forced_passive = state;
 731
 732         thermal_zone_device_update(tz);
 733
 734         return count;
 735 }
 736
 737 static ssize_t
 738 passive_show(struct device *dev, struct device_attribute *attr,
 739                    char *buf)
 740 {
 741         struct thermal_zone_device *tz = to_thermal_zone(dev);
 742
 743         return sprintf(buf, "%d\n", tz->forced_passive);
 744 }
 745
 746 static ssize_t
 747 policy_store(struct device *dev, struct device_attribute *attr,
 748                     const char *buf, size_t count)
 749 {
 750         int ret = -EINVAL;
 751         struct thermal_zone_device *tz = to_thermal_zone(dev);
 752         struct thermal_governor *gov;
 753         char name[THERMAL_NAME_LENGTH];
 754
 755         snprintf(name, sizeof(name), "%s", buf);
 756
 757         mutex_lock(&thermal_governor_lock);
 758
 759         gov = __find_governor(strim(name));
 760         if (!gov)
 761                 goto exit;
 762
 763         tz->governor = gov;
 764         ret = count;
 765
 766 exit:
 767         mutex_unlock(&thermal_governor_lock);
 768         return ret;
 769 }
 770
 771 static ssize_t
 772 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 773 {
 774         struct thermal_zone_device *tz = to_thermal_zone(dev);
 775
 776         return sprintf(buf, "%s\n", tz->governor->name);
 777 }
 778
 779 #ifdef CONFIG_THERMAL_EMULATION
 780 static ssize_t
 781 emul_temp_store(struct device *dev, struct device_attribute *attr,
 782                      const char *buf, size_t count)
 783 {
 784         struct thermal_zone_device *tz = to_thermal_zone(dev);
 785         int ret = 0;
 786         unsigned long temperature;
 787
 788         if (kstrtoul(buf, 10, &temperature))
 789                 return -EINVAL;
 790
 791         if (!tz->ops->set_emul_temp) {
 792                 mutex_lock(&tz->lock);
 793                 tz->emul_temperature = temperature;
 794                 mutex_unlock(&tz->lock);
 795         } else {
 796                 ret = tz->ops->set_emul_temp(tz, temperature);
 797         }
 798
 799         if (!ret)
 800                 thermal_zone_device_update(tz);
 801
 802         return ret ? ret : count;
 803 }
 804 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 805 #endif/*CONFIG_THERMAL_EMULATION*/
 806
 807 static DEVICE_ATTR(type, 0444, type_show, NULL);
 808 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 809 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 810 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 811 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 812
 813 /* sys I/F for cooling device */
 814 #define to_cooling_device(_dev) \
 815         container_of(_dev, struct thermal_cooling_device, device)
 816
 817 static ssize_t
 818 thermal_cooling_device_type_show(struct device *dev,
 819                                  struct device_attribute *attr, char *buf)
 820 {
 821         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 822
 823         return sprintf(buf, "%s\n", cdev->type);
 824 }
 825
 826 static ssize_t
 827 thermal_cooling_device_max_state_show(struct device *dev,
 828                                       struct device_attribute *attr, char *buf)
 829 {
 830         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 831         unsigned long state;
 832         int ret;
 833
 834         ret = cdev->ops->get_max_state(cdev, &state);
 835         if (ret)
 836                 return ret;
 837         return sprintf(buf, "%ld\n", state);
 838 }
 839
 840 static ssize_t
 841 thermal_cooling_device_cur_state_show(struct device *dev,
 842                                       struct device_attribute *attr, char *buf)
 843 {
 844         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 845         unsigned long state;
 846         int ret;
 847
 848         ret = cdev->ops->get_cur_state(cdev, &state);
 849         if (ret)
 850                 return ret;
 851         return sprintf(buf, "%ld\n", state);
 852 }
 853
 854 static ssize_t
 855 thermal_cooling_device_cur_state_store(struct device *dev,
 856                                        struct device_attribute *attr,
 857                                        const char *buf, size_t count)
 858 {
 859         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 860         unsigned long state;
 861         int result;
 862
 863         if (!sscanf(buf, "%ld\n", &state))
 864                 return -EINVAL;
 865
 866         if ((long)state < 0)
 867                 return -EINVAL;
 868
 869         result = cdev->ops->set_cur_state(cdev, state);
 870         if (result)
 871                 return result;
 872         return count;
 873 }
 874
 875 static struct device_attribute dev_attr_cdev_type =
 876 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 877 static DEVICE_ATTR(max_state, 0444,
 878                    thermal_cooling_device_max_state_show, NULL);
 879 static DEVICE_ATTR(cur_state, 0644,
 880                    thermal_cooling_device_cur_state_show,
 881                    thermal_cooling_device_cur_state_store);
 882
 883 static ssize_t
 884 thermal_cooling_device_trip_point_show(struct device *dev,
 885                                        struct device_attribute *attr, char *buf)
 886 {
 887         struct thermal_instance *instance;
 888
 889         instance =
 890             container_of(attr, struct thermal_instance, attr);
 891
 892         if (instance->trip == THERMAL_TRIPS_NONE)
 893                 return sprintf(buf, "-1\n");
 894         else
 895                 return sprintf(buf, "%d\n", instance->trip);
 896 }
 897
 898 /* Device management */
 899
 900 /**
 901  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
 902  * @tz:         pointer to struct thermal_zone_device
 903  * @trip:       indicates which trip point the cooling devices is
 904  *              associated with in this thermal zone.
 905  * @cdev:       pointer to struct thermal_cooling_device
 906  * @upper:      the Maximum cooling state for this trip point.
 907  *              THERMAL_NO_LIMIT means no upper limit,
 908  *              and the cooling device can be in max_state.
 909  * @lower:      the Minimum cooling state can be used for this trip point.
 910  *              THERMAL_NO_LIMIT means no lower limit,
 911  *              and the cooling device can be in cooling state 0.
 912  *
 913  * This interface function bind a thermal cooling device to the certain trip
 914  * point of a thermal zone device.
 915  * This function is usually called in the thermal zone device .bind callback.
 916  *
 917  * Return: 0 on success, the proper error value otherwise.
 918  */
 919 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 920                                      int trip,
 921                                      struct thermal_cooling_device *cdev,
 922                                      unsigned long upper, unsigned long lower)
 923 {
 924         struct thermal_instance *dev;
 925         struct thermal_instance *pos;
 926         struct thermal_zone_device *pos1;
 927         struct thermal_cooling_device *pos2;
 928         unsigned long max_state;
 929         int result;
 930
 931         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 932                 return -EINVAL;
 933
 934         list_for_each_entry(pos1, &thermal_tz_list, node) {
 935                 if (pos1 == tz)
 936                         break;
 937         }
 938         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 939                 if (pos2 == cdev)
 940                         break;
 941         }
 942
 943         if (tz != pos1 || cdev != pos2)
 944                 return -EINVAL;
 945
 946         cdev->ops->get_max_state(cdev, &max_state);
 947
 948         /* lower default 0, upper default max_state */
 949         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 950         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 951
 952         if (lower > upper || upper > max_state)
 953                 return -EINVAL;
 954
 955         dev =
 956             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 957         if (!dev)
 958                 return -ENOMEM;
 959         dev->tz = tz;
 960         dev->cdev = cdev;
 961         dev->trip = trip;
 962         dev->upper = upper;
 963         dev->lower = lower;
 964         dev->target = THERMAL_NO_TARGET;
 965
 966         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 967         if (result)
 968                 goto free_mem;
 969
 970         sprintf(dev->name, "cdev%d", dev->id);
 971         result =
 972             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 973         if (result)
 974                 goto release_idr;
 975
 976         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 977         sysfs_attr_init(&dev->attr.attr);
 978         dev->attr.attr.name = dev->attr_name;
 979         dev->attr.attr.mode = 0444;
 980         dev->attr.show = thermal_cooling_device_trip_point_show;
 981         result = device_create_file(&tz->device, &dev->attr);
 982         if (result)
 983                 goto remove_symbol_link;
 984
 985         mutex_lock(&tz->lock);
 986         mutex_lock(&cdev->lock);
 987         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 988             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 989                 result = -EEXIST;
 990                 break;
 991         }
 992         if (!result) {
 993                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 994                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 995         }
 996         mutex_unlock(&cdev->lock);
 997         mutex_unlock(&tz->lock);
 998
 999         if (!result)
1000                 return 0;
1001
1002         device_remove_file(&tz->device, &dev->attr);
1003 remove_symbol_link:
1004         sysfs_remove_link(&tz->device.kobj, dev->name);
1005 release_idr:
1006         release_idr(&tz->idr, &tz->lock, dev->id);
1007 free_mem:
1008         kfree(dev);
1009         return result;
1010 }
1011 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1012
1013 /**
1014  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1015  *                                        thermal zone.
1016  * @tz:         pointer to a struct thermal_zone_device.
1017  * @trip:       indicates which trip point the cooling devices is
1018  *              associated with in this thermal zone.
1019  * @cdev:       pointer to a struct thermal_cooling_device.
1020  *
1021  * This interface function unbind a thermal cooling device from the certain
1022  * trip point of a thermal zone device.
1023  * This function is usually called in the thermal zone device .unbind callback.
1024  *
1025  * Return: 0 on success, the proper error value otherwise.
1026  */
1027 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1028                                        int trip,
1029                                        struct thermal_cooling_device *cdev)
1030 {
1031         struct thermal_instance *pos, *next;
1032
1033         mutex_lock(&tz->lock);
1034         mutex_lock(&cdev->lock);
1035         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1036                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1037                         list_del(&pos->tz_node);
1038                         list_del(&pos->cdev_node);
1039                         mutex_unlock(&cdev->lock);
1040                         mutex_unlock(&tz->lock);
1041                         goto unbind;
1042                 }
1043         }
1044         mutex_unlock(&cdev->lock);
1045         mutex_unlock(&tz->lock);
1046
1047         return -ENODEV;
1048
1049 unbind:
1050         device_remove_file(&tz->device, &pos->attr);
1051         sysfs_remove_link(&tz->device.kobj, pos->name);
1052         release_idr(&tz->idr, &tz->lock, pos->id);
1053         kfree(pos);
1054         return 0;
1055 }
1056 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1057
1058 static void thermal_release(struct device *dev)
1059 {
1060         struct thermal_zone_device *tz;
1061         struct thermal_cooling_device *cdev;
1062
1063         if (!strncmp(dev_name(dev), "thermal_zone",
1064                      sizeof("thermal_zone") - 1)) {
1065                 tz = to_thermal_zone(dev);
1066                 kfree(tz);
1067         } else if(!strncmp(dev_name(dev), "cooling_device",
1068                         sizeof("cooling_device") - 1)){
1069                 cdev = to_cooling_device(dev);
1070                 kfree(cdev);
1071         }
1072 }
1073
1074 static struct class thermal_class = {
1075         .name = "thermal",
1076         .dev_release = thermal_release,
1077 };
1078
1079 /**
1080  * __thermal_cooling_device_register() - register a new thermal cooling device
1081  * @np:         a pointer to a device tree node.
1082  * @type:       the thermal cooling device type.
1083  * @devdata:    device private data.
1084  * @ops:                standard thermal cooling devices callbacks.
1085  *
1086  * This interface function adds a new thermal cooling device (fan/processor/...)
1087  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1088  * to all the thermal zone devices registered at the same time.
1089  * It also gives the opportunity to link the cooling device to a device tree
1090  * node, so that it can be bound to a thermal zone created out of device tree.
1091  *
1092  * Return: a pointer to the created struct thermal_cooling_device or an
1093  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1094  */
1095 static struct thermal_cooling_device *
1096 __thermal_cooling_device_register(struct device_node *np,
1097                                   char *type, void *devdata,
1098                                   const struct thermal_cooling_device_ops *ops)
1099 {
1100         struct thermal_cooling_device *cdev;
1101         int result;
1102
1103         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1104                 return ERR_PTR(-EINVAL);
1105
1106         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1107             !ops->set_cur_state)
1108                 return ERR_PTR(-EINVAL);
1109
1110         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1111         if (!cdev)
1112                 return ERR_PTR(-ENOMEM);
1113
1114         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1115         if (result) {
1116                 kfree(cdev);
1117                 return ERR_PTR(result);
1118         }
1119
1120         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1121         mutex_init(&cdev->lock);
1122         INIT_LIST_HEAD(&cdev->thermal_instances);
1123         cdev->np = np;
1124         cdev->ops = ops;
1125         cdev->updated = false;
1126         cdev->device.class = &thermal_class;
1127         cdev->devdata = devdata;
1128         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1129         result = device_register(&cdev->device);
1130         if (result) {
1131                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1132                 kfree(cdev);
1133                 return ERR_PTR(result);
1134         }
1135
1136         /* sys I/F */
1137         if (type) {
1138                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1139                 if (result)
1140                         goto unregister;
1141         }
1142
1143         result = device_create_file(&cdev->device, &dev_attr_max_state);
1144         if (result)
1145                 goto unregister;
1146
1147         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1148         if (result)
1149                 goto unregister;
1150
1151         /* Add 'this' new cdev to the global cdev list */
1152         mutex_lock(&thermal_list_lock);
1153         list_add(&cdev->node, &thermal_cdev_list);
1154         mutex_unlock(&thermal_list_lock);
1155
1156         /* Update binding information for 'this' new cdev */
1157         bind_cdev(cdev);
1158
1159         return cdev;
1160
1161 unregister:
1162         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1163         device_unregister(&cdev->device);
1164         return ERR_PTR(result);
1165 }
1166
1167 /**
1168  * thermal_cooling_device_register() - register a new thermal cooling device
1169  * @type:       the thermal cooling device type.
1170  * @devdata:    device private data.
1171  * @ops:                standard thermal cooling devices callbacks.
1172  *
1173  * This interface function adds a new thermal cooling device (fan/processor/...)
1174  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1175  * to all the thermal zone devices registered at the same time.
1176  *
1177  * Return: a pointer to the created struct thermal_cooling_device or an
1178  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1179  */
1180 struct thermal_cooling_device *
1181 thermal_cooling_device_register(char *type, void *devdata,
1182                                 const struct thermal_cooling_device_ops *ops)
1183 {
1184         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1185 }
1186 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1187
1188 /**
1189  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1190  * @np:         a pointer to a device tree node.
1191  * @type:       the thermal cooling device type.
1192  * @devdata:    device private data.
1193  * @ops:                standard thermal cooling devices callbacks.
1194  *
1195  * This function will register a cooling device with device tree node reference.
1196  * This interface function adds a new thermal cooling device (fan/processor/...)
1197  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1198  * to all the thermal zone devices registered at the same time.
1199  *
1200  * Return: a pointer to the created struct thermal_cooling_device or an
1201  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1202  */
1203 struct thermal_cooling_device *
1204 thermal_of_cooling_device_register(struct device_node *np,
1205                                    char *type, void *devdata,
1206                                    const struct thermal_cooling_device_ops *ops)
1207 {
1208         return __thermal_cooling_device_register(np, type, devdata, ops);
1209 }
1210 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1211
1212 /**
1213  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1214  * @cdev:       the thermal cooling device to remove.
1215  *
1216  * thermal_cooling_device_unregister() must be called when the device is no
1217  * longer needed.
1218  */
1219 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1220 {
1221         int i;
1222         const struct thermal_zone_params *tzp;
1223         struct thermal_zone_device *tz;
1224         struct thermal_cooling_device *pos = NULL;
1225
1226         if (!cdev)
1227                 return;
1228
1229         mutex_lock(&thermal_list_lock);
1230         list_for_each_entry(pos, &thermal_cdev_list, node)
1231             if (pos == cdev)
1232                 break;
1233         if (pos != cdev) {
1234                 /* thermal cooling device not found */
1235                 mutex_unlock(&thermal_list_lock);
1236                 return;
1237         }
1238         list_del(&cdev->node);
1239
1240         /* Unbind all thermal zones associated with 'this' cdev */
1241         list_for_each_entry(tz, &thermal_tz_list, node) {
1242                 if (tz->ops->unbind) {
1243                         tz->ops->unbind(tz, cdev);
1244                         continue;
1245                 }
1246
1247                 if (!tz->tzp || !tz->tzp->tbp)
1248                         continue;
1249
1250                 tzp = tz->tzp;
1251                 for (i = 0; i < tzp->num_tbps; i++) {
1252                         if (tzp->tbp[i].cdev == cdev) {
1253                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1254                                 tzp->tbp[i].cdev = NULL;
1255                         }
1256                 }
1257         }
1258
1259         mutex_unlock(&thermal_list_lock);
1260
1261         if (cdev->type[0])
1262                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1263         device_remove_file(&cdev->device, &dev_attr_max_state);
1264         device_remove_file(&cdev->device, &dev_attr_cur_state);
1265
1266         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1267         device_unregister(&cdev->device);
1268         return;
1269 }
1270 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1271
1272 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1273 {
1274         struct thermal_instance *instance;
1275         unsigned long target = 0;
1276
1277         /* cooling device is updated*/
1278         if (cdev->updated)
1279                 return;
1280
1281         mutex_lock(&cdev->lock);
1282         /* Make sure cdev enters the deepest cooling state */
1283         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1284                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1285                                 instance->tz->id, instance->target);
1286                 if (instance->target == THERMAL_NO_TARGET)
1287                         continue;
1288                 if (instance->target > target)
1289                         target = instance->target;
1290         }
1291         mutex_unlock(&cdev->lock);
1292         cdev->ops->set_cur_state(cdev, target);
1293         cdev->updated = true;
1294         dev_dbg(&cdev->device, "set to state %lu\n", target);
1295 }
1296 EXPORT_SYMBOL(thermal_cdev_update);
1297
1298 /**
1299  * thermal_notify_framework - Sensor drivers use this API to notify framework
1300  * @tz:         thermal zone device
1301  * @trip:       indicates which trip point has been crossed
1302  *
1303  * This function handles the trip events from sensor drivers. It starts
1304  * throttling the cooling devices according to the policy configured.
1305  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1306  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1307  * The throttling policy is based on the configured platform data; if no
1308  * platform data is provided, this uses the step_wise throttling policy.
1309  */
1310 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1311 {
1312         handle_thermal_trip(tz, trip);
1313 }
1314 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1315
1316 /**
1317  * create_trip_attrs() - create attributes for trip points
1318  * @tz:         the thermal zone device
1319  * @mask:       Writeable trip point bitmap.
1320  *
1321  * helper function to instantiate sysfs entries for every trip
1322  * point and its properties of a struct thermal_zone_device.
1323  *
1324  * Return: 0 on success, the proper error value otherwise.
1325  */
1326 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1327 {
1328         int indx;
1329         int size = sizeof(struct thermal_attr) * tz->trips;
1330
1331         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1332         if (!tz->trip_type_attrs)
1333                 return -ENOMEM;
1334
1335         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1336         if (!tz->trip_temp_attrs) {
1337                 kfree(tz->trip_type_attrs);
1338                 return -ENOMEM;
1339         }
1340
1341         if (tz->ops->get_trip_hyst) {
1342                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1343                 if (!tz->trip_hyst_attrs) {
1344                         kfree(tz->trip_type_attrs);
1345                         kfree(tz->trip_temp_attrs);
1346                         return -ENOMEM;
1347                 }
1348         }
1349
1350
1351         for (indx = 0; indx < tz->trips; indx++) {
1352                 /* create trip type attribute */
1353                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1354                          "trip_point_%d_type", indx);
1355
1356                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1357                 tz->trip_type_attrs[indx].attr.attr.name =
1358                                                 tz->trip_type_attrs[indx].name;
1359                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1360                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1361
1362                 device_create_file(&tz->device,
1363                                    &tz->trip_type_attrs[indx].attr);
1364
1365                 /* create trip temp attribute */
1366                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1367                          "trip_point_%d_temp", indx);
1368
1369                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1370                 tz->trip_temp_attrs[indx].attr.attr.name =
1371                                                 tz->trip_temp_attrs[indx].name;
1372                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1373                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1374                 if (mask & (1 << indx)) {
1375                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1376                         tz->trip_temp_attrs[indx].attr.store =
1377                                                         trip_point_temp_store;
1378                 }
1379
1380                 device_create_file(&tz->device,
1381                                    &tz->trip_temp_attrs[indx].attr);
1382
1383                 /* create Optional trip hyst attribute */
1384                 if (!tz->ops->get_trip_hyst)
1385                         continue;
1386                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1387                          "trip_point_%d_hyst", indx);
1388
1389                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1390                 tz->trip_hyst_attrs[indx].attr.attr.name =
1391                                         tz->trip_hyst_attrs[indx].name;
1392                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1393                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1394                 if (tz->ops->set_trip_hyst) {
1395                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1396                         tz->trip_hyst_attrs[indx].attr.store =
1397                                         trip_point_hyst_store;
1398                 }
1399
1400                 device_create_file(&tz->device,
1401                                    &tz->trip_hyst_attrs[indx].attr);
1402         }
1403         return 0;
1404 }
1405
1406 static void remove_trip_attrs(struct thermal_zone_device *tz)
1407 {
1408         int indx;
1409
1410         for (indx = 0; indx < tz->trips; indx++) {
1411                 device_remove_file(&tz->device,
1412                                    &tz->trip_type_attrs[indx].attr);
1413                 device_remove_file(&tz->device,
1414                                    &tz->trip_temp_attrs[indx].attr);
1415                 if (tz->ops->get_trip_hyst)
1416                         device_remove_file(&tz->device,
1417                                   &tz->trip_hyst_attrs[indx].attr);
1418         }
1419         kfree(tz->trip_type_attrs);
1420         kfree(tz->trip_temp_attrs);
1421         kfree(tz->trip_hyst_attrs);
1422 }
1423
1424 /**
1425  * thermal_zone_device_register() - register a new thermal zone device
1426  * @type:       the thermal zone device type
1427  * @trips:      the number of trip points the thermal zone support
1428  * @mask:       a bit string indicating the writeablility of trip points
1429  * @devdata:    private device data
1430  * @ops:        standard thermal zone device callbacks
1431  * @tzp:        thermal zone platform parameters
1432  * @passive_delay: number of milliseconds to wait between polls when
1433  *                 performing passive cooling
1434  * @polling_delay: number of milliseconds to wait between polls when checking
1435  *                 whether trip points have been crossed (0 for interrupt
1436  *                 driven systems)
1437  *
1438  * This interface function adds a new thermal zone device (sensor) to
1439  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1440  * thermal cooling devices registered at the same time.
1441  * thermal_zone_device_unregister() must be called when the device is no
1442  * longer needed. The passive cooling depends on the .get_trend() return value.
1443  *
1444  * Return: a pointer to the created struct thermal_zone_device or an
1445  * in case of error, an ERR_PTR. Caller must check return value with
1446  * IS_ERR*() helpers.
1447  */
1448 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1449         int trips, int mask, void *devdata,
1450         struct thermal_zone_device_ops *ops,
1451         const struct thermal_zone_params *tzp,
1452         int passive_delay, int polling_delay)
1453 {
1454         struct thermal_zone_device *tz;
1455         enum thermal_trip_type trip_type;
1456         int result;
1457         int count;
1458         int passive = 0;
1459
1460         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1461                 return ERR_PTR(-EINVAL);
1462
1463         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1464                 return ERR_PTR(-EINVAL);
1465
1466         if (!ops)
1467                 return ERR_PTR(-EINVAL);
1468
1469         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1470                 return ERR_PTR(-EINVAL);
1471
1472         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1473         if (!tz)
1474                 return ERR_PTR(-ENOMEM);
1475
1476         INIT_LIST_HEAD(&tz->thermal_instances);
1477         idr_init(&tz->idr);
1478         mutex_init(&tz->lock);
1479         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1480         if (result) {
1481                 kfree(tz);
1482                 return ERR_PTR(result);
1483         }
1484
1485         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1486         tz->ops = ops;
1487         tz->tzp = tzp;
1488         tz->device.class = &thermal_class;
1489         tz->devdata = devdata;
1490         tz->trips = trips;
1491         tz->passive_delay = passive_delay;
1492         tz->polling_delay = polling_delay;
1493
1494         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1495         result = device_register(&tz->device);
1496         if (result) {
1497                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1498                 kfree(tz);
1499                 return ERR_PTR(result);
1500         }
1501
1502         /* sys I/F */
1503         if (type) {
1504                 result = device_create_file(&tz->device, &dev_attr_type);
1505                 if (result)
1506                         goto unregister;
1507         }
1508
1509         result = device_create_file(&tz->device, &dev_attr_temp);
1510         if (result)
1511                 goto unregister;
1512
1513         if (ops->get_mode) {
1514                 result = device_create_file(&tz->device, &dev_attr_mode);
1515                 if (result)
1516                         goto unregister;
1517         }
1518
1519         result = create_trip_attrs(tz, mask);
1520         if (result)
1521                 goto unregister;
1522
1523         for (count = 0; count < trips; count++) {
1524                 tz->ops->get_trip_type(tz, count, &trip_type);
1525                 if (trip_type == THERMAL_TRIP_PASSIVE)
1526                         passive = 1;
1527         }
1528
1529         if (!passive) {
1530                 result = device_create_file(&tz->device, &dev_attr_passive);
1531                 if (result)
1532                         goto unregister;
1533         }
1534
1535 #ifdef CONFIG_THERMAL_EMULATION
1536         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1537         if (result)
1538                 goto unregister;
1539 #endif
1540         /* Create policy attribute */
1541         result = device_create_file(&tz->device, &dev_attr_policy);
1542         if (result)
1543                 goto unregister;
1544
1545         /* Update 'this' zone's governor information */
1546         mutex_lock(&thermal_governor_lock);
1547
1548         if (tz->tzp)
1549                 tz->governor = __find_governor(tz->tzp->governor_name);
1550         else
1551                 tz->governor = def_governor;
1552
1553         mutex_unlock(&thermal_governor_lock);
1554
1555         if (!tz->tzp || !tz->tzp->no_hwmon) {
1556                 result = thermal_add_hwmon_sysfs(tz);
1557                 if (result)
1558                         goto unregister;
1559         }
1560
1561         mutex_lock(&thermal_list_lock);
1562         list_add_tail(&tz->node, &thermal_tz_list);
1563         mutex_unlock(&thermal_list_lock);
1564
1565         /* Bind cooling devices for this zone */
1566         bind_tz(tz);
1567
1568         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1569
1570         if (!tz->ops->get_temp)
1571                 thermal_zone_device_set_polling(tz, 0);
1572
1573         thermal_zone_device_update(tz);
1574
1575         if (!result)
1576                 return tz;
1577
1578 unregister:
1579         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1580         device_unregister(&tz->device);
1581         return ERR_PTR(result);
1582 }
1583 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1584
1585 /**
1586  * thermal_device_unregister - removes the registered thermal zone device
1587  * @tz: the thermal zone device to remove
1588  */
1589 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1590 {
1591         int i;
1592         const struct thermal_zone_params *tzp;
1593         struct thermal_cooling_device *cdev;
1594         struct thermal_zone_device *pos = NULL;
1595
1596         if (!tz)
1597                 return;
1598
1599         tzp = tz->tzp;
1600
1601         mutex_lock(&thermal_list_lock);
1602         list_for_each_entry(pos, &thermal_tz_list, node)
1603             if (pos == tz)
1604                 break;
1605         if (pos != tz) {
1606                 /* thermal zone device not found */
1607                 mutex_unlock(&thermal_list_lock);
1608                 return;
1609         }
1610         list_del(&tz->node);
1611
1612         /* Unbind all cdevs associated with 'this' thermal zone */
1613         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1614                 if (tz->ops->unbind) {
1615                         tz->ops->unbind(tz, cdev);
1616                         continue;
1617                 }
1618
1619                 if (!tzp || !tzp->tbp)
1620                         break;
1621
1622                 for (i = 0; i < tzp->num_tbps; i++) {
1623                         if (tzp->tbp[i].cdev == cdev) {
1624                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1625                                 tzp->tbp[i].cdev = NULL;
1626                         }
1627                 }
1628         }
1629
1630         mutex_unlock(&thermal_list_lock);
1631
1632         thermal_zone_device_set_polling(tz, 0);
1633
1634         if (tz->type[0])
1635                 device_remove_file(&tz->device, &dev_attr_type);
1636         device_remove_file(&tz->device, &dev_attr_temp);
1637         if (tz->ops->get_mode)
1638                 device_remove_file(&tz->device, &dev_attr_mode);
1639         device_remove_file(&tz->device, &dev_attr_policy);
1640         remove_trip_attrs(tz);
1641         tz->governor = NULL;
1642
1643         thermal_remove_hwmon_sysfs(tz);
1644         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1645         idr_destroy(&tz->idr);
1646         mutex_destroy(&tz->lock);
1647         device_unregister(&tz->device);
1648         return;
1649 }
1650 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1651
1652 /**
1653  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1654  * @name: thermal zone name to fetch the temperature
1655  *
1656  * When only one zone is found with the passed name, returns a reference to it.
1657  *
1658  * Return: On success returns a reference to an unique thermal zone with
1659  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1660  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1661  */
1662 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1663 {
1664         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1665         unsigned int found = 0;
1666
1667         if (!name)
1668                 goto exit;
1669
1670         mutex_lock(&thermal_list_lock);
1671         list_for_each_entry(pos, &thermal_tz_list, node)
1672                 if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1673                         found++;
1674                         ref = pos;
1675                 }
1676         mutex_unlock(&thermal_list_lock);
1677
1678         /* nothing has been found, thus an error code for it */
1679         if (found == 0)
1680                 ref = ERR_PTR(-ENODEV);
1681         else if (found > 1)
1682         /* Success only when an unique zone is found */
1683                 ref = ERR_PTR(-EEXIST);
1684
1685 exit:
1686         return ref;
1687 }
1688 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1689
1690 #ifdef CONFIG_NET
1691 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1692         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1693 };
1694
1695 static struct genl_family thermal_event_genl_family = {
1696         .id = GENL_ID_GENERATE,
1697         .name = THERMAL_GENL_FAMILY_NAME,
1698         .version = THERMAL_GENL_VERSION,
1699         .maxattr = THERMAL_GENL_ATTR_MAX,
1700         .mcgrps = thermal_event_mcgrps,
1701         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1702 };
1703
1704 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1705                                         enum events event)
1706 {
1707         struct sk_buff *skb;
1708         struct nlattr *attr;
1709         struct thermal_genl_event *thermal_event;
1710         void *msg_header;
1711         int size;
1712         int result;
1713         static unsigned int thermal_event_seqnum;
1714
1715         if (!tz)
1716                 return -EINVAL;
1717
1718         /* allocate memory */
1719         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1720                nla_total_size(0);
1721
1722         skb = genlmsg_new(size, GFP_ATOMIC);
1723         if (!skb)
1724                 return -ENOMEM;
1725
1726         /* add the genetlink message header */
1727         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1728                                  &thermal_event_genl_family, 0,
1729                                  THERMAL_GENL_CMD_EVENT);
1730         if (!msg_header) {
1731                 nlmsg_free(skb);
1732                 return -ENOMEM;
1733         }
1734
1735         /* fill the data */
1736         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1737                            sizeof(struct thermal_genl_event));
1738
1739         if (!attr) {
1740                 nlmsg_free(skb);
1741                 return -EINVAL;
1742         }
1743
1744         thermal_event = nla_data(attr);
1745         if (!thermal_event) {
1746                 nlmsg_free(skb);
1747                 return -EINVAL;
1748         }
1749
1750         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1751
1752         thermal_event->orig = tz->id;
1753         thermal_event->event = event;
1754
1755         /* send multicast genetlink message */
1756         result = genlmsg_end(skb, msg_header);
1757         if (result < 0) {
1758                 nlmsg_free(skb);
1759                 return result;
1760         }
1761
1762         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1763                                    0, GFP_ATOMIC);
1764         if (result)
1765                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1766
1767         return result;
1768 }
1769 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1770
1771 static int genetlink_init(void)
1772 {
1773         return genl_register_family(&thermal_event_genl_family);
1774 }
1775
1776 static void genetlink_exit(void)
1777 {
1778         genl_unregister_family(&thermal_event_genl_family);
1779 }
1780 #else /* !CONFIG_NET */
1781 static inline int genetlink_init(void) { return 0; }
1782 static inline void genetlink_exit(void) {}
1783 #endif /* !CONFIG_NET */
1784
1785 static int __init thermal_register_governors(void)
1786 {
1787         int result;
1788
1789         result = thermal_gov_step_wise_register();
1790         if (result)
1791                 return result;
1792
1793         result = thermal_gov_fair_share_register();
1794         if (result)
1795                 return result;
1796
1797         return thermal_gov_user_space_register();
1798 }
1799
1800 static void thermal_unregister_governors(void)
1801 {
1802         thermal_gov_step_wise_unregister();
1803         thermal_gov_fair_share_unregister();
1804         thermal_gov_user_space_unregister();
1805 }
1806
1807 static int __init thermal_init(void)
1808 {
1809         int result;
1810
1811         result = thermal_register_governors();
1812         if (result)
1813                 goto error;
1814
1815         result = class_register(&thermal_class);
1816         if (result)
1817                 goto unregister_governors;
1818
1819         result = genetlink_init();
1820         if (result)
1821                 goto unregister_class;
1822
1823         result = of_parse_thermal_zones();
1824         if (result)
1825                 goto exit_netlink;
1826
1827         return 0;
1828
1829 exit_netlink:
1830         genetlink_exit();
1831 unregister_governors:
1832         thermal_unregister_governors();
1833 unregister_class:
1834         class_unregister(&thermal_class);
1835 error:
1836         idr_destroy(&thermal_tz_idr);
1837         idr_destroy(&thermal_cdev_idr);
1838         mutex_destroy(&thermal_idr_lock);
1839         mutex_destroy(&thermal_list_lock);
1840         mutex_destroy(&thermal_governor_lock);
1841         return result;
1842 }
1843
1844 static void __exit thermal_exit(void)
1845 {
1846         of_thermal_destroy_zones();
1847         genetlink_exit();
1848         class_unregister(&thermal_class);
1849         thermal_unregister_governors();
1850         idr_destroy(&thermal_tz_idr);
1851         idr_destroy(&thermal_cdev_idr);
1852         mutex_destroy(&thermal_idr_lock);
1853         mutex_destroy(&thermal_list_lock);
1854         mutex_destroy(&thermal_governor_lock);
1855 }
1856
1857 fs_initcall(thermal_init);
1858 module_exit(thermal_exit);