drivers/thermal/thermal_sys.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 <net/netlink.h>
  37 #include <net/genetlink.h>
  38
  39 #include "thermal_core.h"
  40
  41 MODULE_AUTHOR("Zhang Rui");
  42 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  43 MODULE_LICENSE("GPL");
  44
  45 static DEFINE_IDR(thermal_tz_idr);
  46 static DEFINE_IDR(thermal_cdev_idr);
  47 static DEFINE_MUTEX(thermal_idr_lock);
  48
  49 static LIST_HEAD(thermal_tz_list);
  50 static LIST_HEAD(thermal_cdev_list);
  51 static LIST_HEAD(thermal_governor_list);
  52
  53 static DEFINE_MUTEX(thermal_list_lock);
  54 static DEFINE_MUTEX(thermal_governor_lock);
  55
  56 static struct thermal_governor *__find_governor(const char *name)
  57 {
  58         struct thermal_governor *pos;
  59
  60         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  61                 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
  62                         return pos;
  63
  64         return NULL;
  65 }
  66
  67 int thermal_register_governor(struct thermal_governor *governor)
  68 {
  69         int err;
  70         const char *name;
  71         struct thermal_zone_device *pos;
  72
  73         if (!governor)
  74                 return -EINVAL;
  75
  76         mutex_lock(&thermal_governor_lock);
  77
  78         err = -EBUSY;
  79         if (__find_governor(governor->name) == NULL) {
  80                 err = 0;
  81                 list_add(&governor->governor_list, &thermal_governor_list);
  82         }
  83
  84         mutex_lock(&thermal_list_lock);
  85
  86         list_for_each_entry(pos, &thermal_tz_list, node) {
  87                 if (pos->governor)
  88                         continue;
  89                 if (pos->tzp)
  90                         name = pos->tzp->governor_name;
  91                 else
  92                         name = DEFAULT_THERMAL_GOVERNOR;
  93                 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
  94                         pos->governor = governor;
  95         }
  96
  97         mutex_unlock(&thermal_list_lock);
  98         mutex_unlock(&thermal_governor_lock);
  99
 100         return err;
 101 }
 102 EXPORT_SYMBOL_GPL(thermal_register_governor);
 103
 104 void thermal_unregister_governor(struct thermal_governor *governor)
 105 {
 106         struct thermal_zone_device *pos;
 107
 108         if (!governor)
 109                 return;
 110
 111         mutex_lock(&thermal_governor_lock);
 112
 113         if (__find_governor(governor->name) == NULL)
 114                 goto exit;
 115
 116         mutex_lock(&thermal_list_lock);
 117
 118         list_for_each_entry(pos, &thermal_tz_list, node) {
 119                 if (!strnicmp(pos->governor->name, governor->name,
 120                                                 THERMAL_NAME_LENGTH))
 121                         pos->governor = NULL;
 122         }
 123
 124         mutex_unlock(&thermal_list_lock);
 125         list_del(&governor->governor_list);
 126 exit:
 127         mutex_unlock(&thermal_governor_lock);
 128         return;
 129 }
 130 EXPORT_SYMBOL_GPL(thermal_unregister_governor);
 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->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
 161                 if (tz->temperature > tz->last_temperature)
 162                         trend = THERMAL_TREND_RAISING;
 163                 else if (tz->temperature < tz->last_temperature)
 164                         trend = THERMAL_TREND_DROPPING;
 165                 else
 166                         trend = THERMAL_TREND_STABLE;
 167         }
 168
 169         return trend;
 170 }
 171 EXPORT_SYMBOL(get_tz_trend);
 172
 173 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 174                         struct thermal_cooling_device *cdev, int trip)
 175 {
 176         struct thermal_instance *pos = NULL;
 177         struct thermal_instance *target_instance = NULL;
 178
 179         mutex_lock(&tz->lock);
 180         mutex_lock(&cdev->lock);
 181
 182         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 183                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 184                         target_instance = pos;
 185                         break;
 186                 }
 187         }
 188
 189         mutex_unlock(&cdev->lock);
 190         mutex_unlock(&tz->lock);
 191
 192         return target_instance;
 193 }
 194 EXPORT_SYMBOL(get_thermal_instance);
 195
 196 static void print_bind_err_msg(struct thermal_zone_device *tz,
 197                         struct thermal_cooling_device *cdev, int ret)
 198 {
 199         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 200                                 tz->type, cdev->type, ret);
 201 }
 202
 203 static void __bind(struct thermal_zone_device *tz, int mask,
 204                         struct thermal_cooling_device *cdev)
 205 {
 206         int i, ret;
 207
 208         for (i = 0; i < tz->trips; i++) {
 209                 if (mask & (1 << i)) {
 210                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 211                                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 212                         if (ret)
 213                                 print_bind_err_msg(tz, cdev, ret);
 214                 }
 215         }
 216 }
 217
 218 static void __unbind(struct thermal_zone_device *tz, int mask,
 219                         struct thermal_cooling_device *cdev)
 220 {
 221         int i;
 222
 223         for (i = 0; i < tz->trips; i++)
 224                 if (mask & (1 << i))
 225                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 226 }
 227
 228 static void bind_cdev(struct thermal_cooling_device *cdev)
 229 {
 230         int i, ret;
 231         const struct thermal_zone_params *tzp;
 232         struct thermal_zone_device *pos = NULL;
 233
 234         mutex_lock(&thermal_list_lock);
 235
 236         list_for_each_entry(pos, &thermal_tz_list, node) {
 237                 if (!pos->tzp && !pos->ops->bind)
 238                         continue;
 239
 240                 if (!pos->tzp && pos->ops->bind) {
 241                         ret = pos->ops->bind(pos, cdev);
 242                         if (ret)
 243                                 print_bind_err_msg(pos, cdev, ret);
 244                 }
 245
 246                 tzp = pos->tzp;
 247                 if (!tzp || !tzp->tbp)
 248                         continue;
 249
 250                 for (i = 0; i < tzp->num_tbps; i++) {
 251                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 252                                 continue;
 253                         if (tzp->tbp[i].match(pos, cdev))
 254                                 continue;
 255                         tzp->tbp[i].cdev = cdev;
 256                         __bind(pos, tzp->tbp[i].trip_mask, cdev);
 257                 }
 258         }
 259
 260         mutex_unlock(&thermal_list_lock);
 261 }
 262
 263 static void bind_tz(struct thermal_zone_device *tz)
 264 {
 265         int i, ret;
 266         struct thermal_cooling_device *pos = NULL;
 267         const struct thermal_zone_params *tzp = tz->tzp;
 268
 269         if (!tzp && !tz->ops->bind)
 270                 return;
 271
 272         mutex_lock(&thermal_list_lock);
 273
 274         /* If there is no platform data, try to use ops->bind */
 275         if (!tzp && tz->ops->bind) {
 276                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 277                         ret = tz->ops->bind(tz, pos);
 278                         if (ret)
 279                                 print_bind_err_msg(tz, pos, ret);
 280                 }
 281                 goto exit;
 282         }
 283
 284         if (!tzp || !tzp->tbp)
 285                 goto exit;
 286
 287         list_for_each_entry(pos, &thermal_cdev_list, node) {
 288                 for (i = 0; i < tzp->num_tbps; i++) {
 289                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 290                                 continue;
 291                         if (tzp->tbp[i].match(tz, pos))
 292                                 continue;
 293                         tzp->tbp[i].cdev = pos;
 294                         __bind(tz, tzp->tbp[i].trip_mask, pos);
 295                 }
 296         }
 297 exit:
 298         mutex_unlock(&thermal_list_lock);
 299 }
 300
 301 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 302                                             int delay)
 303 {
 304         if (delay > 1000)
 305                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 306                                  round_jiffies(msecs_to_jiffies(delay)));
 307         else if (delay)
 308                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 309                                  msecs_to_jiffies(delay));
 310         else
 311                 cancel_delayed_work(&tz->poll_queue);
 312 }
 313
 314 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 315 {
 316         mutex_lock(&tz->lock);
 317
 318         if (tz->passive)
 319                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 320         else if (tz->polling_delay)
 321                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 322         else
 323                 thermal_zone_device_set_polling(tz, 0);
 324
 325         mutex_unlock(&tz->lock);
 326 }
 327
 328 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 329                         int trip, enum thermal_trip_type trip_type)
 330 {
 331         if (tz->governor)
 332                 tz->governor->throttle(tz, trip);
 333 }
 334
 335 static void handle_critical_trips(struct thermal_zone_device *tz,
 336                                 int trip, enum thermal_trip_type trip_type)
 337 {
 338         long trip_temp;
 339
 340         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 341
 342         /* If we have not crossed the trip_temp, we do not care. */
 343         if (tz->temperature < trip_temp)
 344                 return;
 345
 346         if (tz->ops->notify)
 347                 tz->ops->notify(tz, trip, trip_type);
 348
 349         if (trip_type == THERMAL_TRIP_CRITICAL) {
 350                 dev_emerg(&tz->device,
 351                           "critical temperature reached(%d C),shutting down\n",
 352                           tz->temperature / 1000);
 353                 orderly_poweroff(true);
 354         }
 355 }
 356
 357 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 358 {
 359         enum thermal_trip_type type;
 360
 361         tz->ops->get_trip_type(tz, trip, &type);
 362
 363         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 364                 handle_critical_trips(tz, trip, type);
 365         else
 366                 handle_non_critical_trips(tz, trip, type);
 367         /*
 368          * Alright, we handled this trip successfully.
 369          * So, start monitoring again.
 370          */
 371         monitor_thermal_zone(tz);
 372 }
 373
 374 static int thermal_zone_get_temp(struct thermal_zone_device *tz,
 375                                 unsigned long *temp)
 376 {
 377         int ret = 0;
 378 #ifdef CONFIG_THERMAL_EMULATION
 379         int count;
 380         unsigned long crit_temp = -1UL;
 381         enum thermal_trip_type type;
 382 #endif
 383
 384         mutex_lock(&tz->lock);
 385
 386         ret = tz->ops->get_temp(tz, temp);
 387 #ifdef CONFIG_THERMAL_EMULATION
 388         if (!tz->emul_temperature)
 389                 goto skip_emul;
 390
 391         for (count = 0; count < tz->trips; count++) {
 392                 ret = tz->ops->get_trip_type(tz, count, &type);
 393                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 394                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 395                         break;
 396                 }
 397         }
 398
 399         if (ret)
 400                 goto skip_emul;
 401
 402         if (*temp < crit_temp)
 403                 *temp = tz->emul_temperature;
 404 skip_emul:
 405 #endif
 406         mutex_unlock(&tz->lock);
 407         return ret;
 408 }
 409
 410 static void update_temperature(struct thermal_zone_device *tz)
 411 {
 412         long temp;
 413         int ret;
 414
 415         ret = thermal_zone_get_temp(tz, &temp);
 416         if (ret) {
 417                 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
 418                          tz->id);
 419                 return;
 420         }
 421
 422         mutex_lock(&tz->lock);
 423         tz->last_temperature = tz->temperature;
 424         tz->temperature = temp;
 425         mutex_unlock(&tz->lock);
 426 }
 427
 428 void thermal_zone_device_update(struct thermal_zone_device *tz)
 429 {
 430         int count;
 431
 432         update_temperature(tz);
 433
 434         for (count = 0; count < tz->trips; count++)
 435                 handle_thermal_trip(tz, count);
 436 }
 437 EXPORT_SYMBOL(thermal_zone_device_update);
 438
 439 static void thermal_zone_device_check(struct work_struct *work)
 440 {
 441         struct thermal_zone_device *tz = container_of(work, struct
 442                                                       thermal_zone_device,
 443                                                       poll_queue.work);
 444         thermal_zone_device_update(tz);
 445 }
 446
 447 /* sys I/F for thermal zone */
 448
 449 #define to_thermal_zone(_dev) \
 450         container_of(_dev, struct thermal_zone_device, device)
 451
 452 static ssize_t
 453 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 454 {
 455         struct thermal_zone_device *tz = to_thermal_zone(dev);
 456
 457         return sprintf(buf, "%s\n", tz->type);
 458 }
 459
 460 static ssize_t
 461 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 462 {
 463         struct thermal_zone_device *tz = to_thermal_zone(dev);
 464         long temperature;
 465         int ret;
 466
 467         ret = thermal_zone_get_temp(tz, &temperature);
 468
 469         if (ret)
 470                 return ret;
 471
 472         return sprintf(buf, "%ld\n", temperature);
 473 }
 474
 475 static ssize_t
 476 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 477 {
 478         struct thermal_zone_device *tz = to_thermal_zone(dev);
 479         enum thermal_device_mode mode;
 480         int result;
 481
 482         if (!tz->ops->get_mode)
 483                 return -EPERM;
 484
 485         result = tz->ops->get_mode(tz, &mode);
 486         if (result)
 487                 return result;
 488
 489         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 490                        : "disabled");
 491 }
 492
 493 static ssize_t
 494 mode_store(struct device *dev, struct device_attribute *attr,
 495            const char *buf, size_t count)
 496 {
 497         struct thermal_zone_device *tz = to_thermal_zone(dev);
 498         int result;
 499
 500         if (!tz->ops->set_mode)
 501                 return -EPERM;
 502
 503         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 504                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 505         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 506                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 507         else
 508                 result = -EINVAL;
 509
 510         if (result)
 511                 return result;
 512
 513         return count;
 514 }
 515
 516 static ssize_t
 517 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 518                      char *buf)
 519 {
 520         struct thermal_zone_device *tz = to_thermal_zone(dev);
 521         enum thermal_trip_type type;
 522         int trip, result;
 523
 524         if (!tz->ops->get_trip_type)
 525                 return -EPERM;
 526
 527         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 528                 return -EINVAL;
 529
 530         result = tz->ops->get_trip_type(tz, trip, &type);
 531         if (result)
 532                 return result;
 533
 534         switch (type) {
 535         case THERMAL_TRIP_CRITICAL:
 536                 return sprintf(buf, "critical\n");
 537         case THERMAL_TRIP_HOT:
 538                 return sprintf(buf, "hot\n");
 539         case THERMAL_TRIP_PASSIVE:
 540                 return sprintf(buf, "passive\n");
 541         case THERMAL_TRIP_ACTIVE:
 542                 return sprintf(buf, "active\n");
 543         default:
 544                 return sprintf(buf, "unknown\n");
 545         }
 546 }
 547
 548 static ssize_t
 549 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 550                      const char *buf, size_t count)
 551 {
 552         struct thermal_zone_device *tz = to_thermal_zone(dev);
 553         int trip, ret;
 554         unsigned long temperature;
 555
 556         if (!tz->ops->set_trip_temp)
 557                 return -EPERM;
 558
 559         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 560                 return -EINVAL;
 561
 562         if (kstrtoul(buf, 10, &temperature))
 563                 return -EINVAL;
 564
 565         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 566
 567         return ret ? ret : count;
 568 }
 569
 570 static ssize_t
 571 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 572                      char *buf)
 573 {
 574         struct thermal_zone_device *tz = to_thermal_zone(dev);
 575         int trip, ret;
 576         long temperature;
 577
 578         if (!tz->ops->get_trip_temp)
 579                 return -EPERM;
 580
 581         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 582                 return -EINVAL;
 583
 584         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 585
 586         if (ret)
 587                 return ret;
 588
 589         return sprintf(buf, "%ld\n", temperature);
 590 }
 591
 592 static ssize_t
 593 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 594                         const char *buf, size_t count)
 595 {
 596         struct thermal_zone_device *tz = to_thermal_zone(dev);
 597         int trip, ret;
 598         unsigned long temperature;
 599
 600         if (!tz->ops->set_trip_hyst)
 601                 return -EPERM;
 602
 603         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 604                 return -EINVAL;
 605
 606         if (kstrtoul(buf, 10, &temperature))
 607                 return -EINVAL;
 608
 609         /*
 610          * We are not doing any check on the 'temperature' value
 611          * here. The driver implementing 'set_trip_hyst' has to
 612          * take care of this.
 613          */
 614         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 615
 616         return ret ? ret : count;
 617 }
 618
 619 static ssize_t
 620 trip_point_hyst_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         unsigned long temperature;
 626
 627         if (!tz->ops->get_trip_hyst)
 628                 return -EPERM;
 629
 630         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 631                 return -EINVAL;
 632
 633         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 634
 635         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 636 }
 637
 638 static ssize_t
 639 passive_store(struct device *dev, struct device_attribute *attr,
 640                     const char *buf, size_t count)
 641 {
 642         struct thermal_zone_device *tz = to_thermal_zone(dev);
 643         struct thermal_cooling_device *cdev = NULL;
 644         int state;
 645
 646         if (!sscanf(buf, "%d\n", &state))
 647                 return -EINVAL;
 648
 649         /* sanity check: values below 1000 millicelcius don't make sense
 650          * and can cause the system to go into a thermal heart attack
 651          */
 652         if (state && state < 1000)
 653                 return -EINVAL;
 654
 655         if (state && !tz->forced_passive) {
 656                 mutex_lock(&thermal_list_lock);
 657                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 658                         if (!strncmp("Processor", cdev->type,
 659                                      sizeof("Processor")))
 660                                 thermal_zone_bind_cooling_device(tz,
 661                                                 THERMAL_TRIPS_NONE, cdev,
 662                                                 THERMAL_NO_LIMIT,
 663                                                 THERMAL_NO_LIMIT);
 664                 }
 665                 mutex_unlock(&thermal_list_lock);
 666                 if (!tz->passive_delay)
 667                         tz->passive_delay = 1000;
 668         } else if (!state && tz->forced_passive) {
 669                 mutex_lock(&thermal_list_lock);
 670                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 671                         if (!strncmp("Processor", cdev->type,
 672                                      sizeof("Processor")))
 673                                 thermal_zone_unbind_cooling_device(tz,
 674                                                                    THERMAL_TRIPS_NONE,
 675                                                                    cdev);
 676                 }
 677                 mutex_unlock(&thermal_list_lock);
 678                 tz->passive_delay = 0;
 679         }
 680
 681         tz->forced_passive = state;
 682
 683         thermal_zone_device_update(tz);
 684
 685         return count;
 686 }
 687
 688 static ssize_t
 689 passive_show(struct device *dev, struct device_attribute *attr,
 690                    char *buf)
 691 {
 692         struct thermal_zone_device *tz = to_thermal_zone(dev);
 693
 694         return sprintf(buf, "%d\n", tz->forced_passive);
 695 }
 696
 697 static ssize_t
 698 policy_store(struct device *dev, struct device_attribute *attr,
 699                     const char *buf, size_t count)
 700 {
 701         int ret = -EINVAL;
 702         struct thermal_zone_device *tz = to_thermal_zone(dev);
 703         struct thermal_governor *gov;
 704
 705         mutex_lock(&thermal_governor_lock);
 706
 707         gov = __find_governor(buf);
 708         if (!gov)
 709                 goto exit;
 710
 711         tz->governor = gov;
 712         ret = count;
 713
 714 exit:
 715         mutex_unlock(&thermal_governor_lock);
 716         return ret;
 717 }
 718
 719 static ssize_t
 720 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 721 {
 722         struct thermal_zone_device *tz = to_thermal_zone(dev);
 723
 724         return sprintf(buf, "%s\n", tz->governor->name);
 725 }
 726
 727 #ifdef CONFIG_THERMAL_EMULATION
 728 static ssize_t
 729 emul_temp_store(struct device *dev, struct device_attribute *attr,
 730                      const char *buf, size_t count)
 731 {
 732         struct thermal_zone_device *tz = to_thermal_zone(dev);
 733         int ret = 0;
 734         unsigned long temperature;
 735
 736         if (kstrtoul(buf, 10, &temperature))
 737                 return -EINVAL;
 738
 739         if (!tz->ops->set_emul_temp) {
 740                 mutex_lock(&tz->lock);
 741                 tz->emul_temperature = temperature;
 742                 mutex_unlock(&tz->lock);
 743         } else {
 744                 ret = tz->ops->set_emul_temp(tz, temperature);
 745         }
 746
 747         return ret ? ret : count;
 748 }
 749 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 750 #endif/*CONFIG_THERMAL_EMULATION*/
 751
 752 static DEVICE_ATTR(type, 0444, type_show, NULL);
 753 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 754 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 755 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 756 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 757
 758 /* sys I/F for cooling device */
 759 #define to_cooling_device(_dev) \
 760         container_of(_dev, struct thermal_cooling_device, device)
 761
 762 static ssize_t
 763 thermal_cooling_device_type_show(struct device *dev,
 764                                  struct device_attribute *attr, char *buf)
 765 {
 766         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 767
 768         return sprintf(buf, "%s\n", cdev->type);
 769 }
 770
 771 static ssize_t
 772 thermal_cooling_device_max_state_show(struct device *dev,
 773                                       struct device_attribute *attr, char *buf)
 774 {
 775         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 776         unsigned long state;
 777         int ret;
 778
 779         ret = cdev->ops->get_max_state(cdev, &state);
 780         if (ret)
 781                 return ret;
 782         return sprintf(buf, "%ld\n", state);
 783 }
 784
 785 static ssize_t
 786 thermal_cooling_device_cur_state_show(struct device *dev,
 787                                       struct device_attribute *attr, char *buf)
 788 {
 789         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 790         unsigned long state;
 791         int ret;
 792
 793         ret = cdev->ops->get_cur_state(cdev, &state);
 794         if (ret)
 795                 return ret;
 796         return sprintf(buf, "%ld\n", state);
 797 }
 798
 799 static ssize_t
 800 thermal_cooling_device_cur_state_store(struct device *dev,
 801                                        struct device_attribute *attr,
 802                                        const char *buf, size_t count)
 803 {
 804         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 805         unsigned long state;
 806         int result;
 807
 808         if (!sscanf(buf, "%ld\n", &state))
 809                 return -EINVAL;
 810
 811         if ((long)state < 0)
 812                 return -EINVAL;
 813
 814         result = cdev->ops->set_cur_state(cdev, state);
 815         if (result)
 816                 return result;
 817         return count;
 818 }
 819
 820 static struct device_attribute dev_attr_cdev_type =
 821 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 822 static DEVICE_ATTR(max_state, 0444,
 823                    thermal_cooling_device_max_state_show, NULL);
 824 static DEVICE_ATTR(cur_state, 0644,
 825                    thermal_cooling_device_cur_state_show,
 826                    thermal_cooling_device_cur_state_store);
 827
 828 static ssize_t
 829 thermal_cooling_device_trip_point_show(struct device *dev,
 830                                        struct device_attribute *attr, char *buf)
 831 {
 832         struct thermal_instance *instance;
 833
 834         instance =
 835             container_of(attr, struct thermal_instance, attr);
 836
 837         if (instance->trip == THERMAL_TRIPS_NONE)
 838                 return sprintf(buf, "-1\n");
 839         else
 840                 return sprintf(buf, "%d\n", instance->trip);
 841 }
 842
 843 /* Device management */
 844
 845 #if defined(CONFIG_THERMAL_HWMON)
 846
 847 /* hwmon sys I/F */
 848 #include <linux/hwmon.h>
 849
 850 /* thermal zone devices with the same type share one hwmon device */
 851 struct thermal_hwmon_device {
 852         char type[THERMAL_NAME_LENGTH];
 853         struct device *device;
 854         int count;
 855         struct list_head tz_list;
 856         struct list_head node;
 857 };
 858
 859 struct thermal_hwmon_attr {
 860         struct device_attribute attr;
 861         char name[16];
 862 };
 863
 864 /* one temperature input for each thermal zone */
 865 struct thermal_hwmon_temp {
 866         struct list_head hwmon_node;
 867         struct thermal_zone_device *tz;
 868         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 869         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 870 };
 871
 872 static LIST_HEAD(thermal_hwmon_list);
 873
 874 static ssize_t
 875 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 876 {
 877         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 878         return sprintf(buf, "%s\n", hwmon->type);
 879 }
 880 static DEVICE_ATTR(name, 0444, name_show, NULL);
 881
 882 static ssize_t
 883 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 884 {
 885         long temperature;
 886         int ret;
 887         struct thermal_hwmon_attr *hwmon_attr
 888                         = container_of(attr, struct thermal_hwmon_attr, attr);
 889         struct thermal_hwmon_temp *temp
 890                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 891                                        temp_input);
 892         struct thermal_zone_device *tz = temp->tz;
 893
 894         ret = thermal_zone_get_temp(tz, &temperature);
 895
 896         if (ret)
 897                 return ret;
 898
 899         return sprintf(buf, "%ld\n", temperature);
 900 }
 901
 902 static ssize_t
 903 temp_crit_show(struct device *dev, struct device_attribute *attr,
 904                 char *buf)
 905 {
 906         struct thermal_hwmon_attr *hwmon_attr
 907                         = container_of(attr, struct thermal_hwmon_attr, attr);
 908         struct thermal_hwmon_temp *temp
 909                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 910                                        temp_crit);
 911         struct thermal_zone_device *tz = temp->tz;
 912         long temperature;
 913         int ret;
 914
 915         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 916         if (ret)
 917                 return ret;
 918
 919         return sprintf(buf, "%ld\n", temperature);
 920 }
 921
 922
 923 static struct thermal_hwmon_device *
 924 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 925 {
 926         struct thermal_hwmon_device *hwmon;
 927
 928         mutex_lock(&thermal_list_lock);
 929         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 930                 if (!strcmp(hwmon->type, tz->type)) {
 931                         mutex_unlock(&thermal_list_lock);
 932                         return hwmon;
 933                 }
 934         mutex_unlock(&thermal_list_lock);
 935
 936         return NULL;
 937 }
 938
 939 /* Find the temperature input matching a given thermal zone */
 940 static struct thermal_hwmon_temp *
 941 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 942                           const struct thermal_zone_device *tz)
 943 {
 944         struct thermal_hwmon_temp *temp;
 945
 946         mutex_lock(&thermal_list_lock);
 947         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 948                 if (temp->tz == tz) {
 949                         mutex_unlock(&thermal_list_lock);
 950                         return temp;
 951                 }
 952         mutex_unlock(&thermal_list_lock);
 953
 954         return NULL;
 955 }
 956
 957 static int
 958 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 959 {
 960         struct thermal_hwmon_device *hwmon;
 961         struct thermal_hwmon_temp *temp;
 962         int new_hwmon_device = 1;
 963         int result;
 964
 965         hwmon = thermal_hwmon_lookup_by_type(tz);
 966         if (hwmon) {
 967                 new_hwmon_device = 0;
 968                 goto register_sys_interface;
 969         }
 970
 971         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 972         if (!hwmon)
 973                 return -ENOMEM;
 974
 975         INIT_LIST_HEAD(&hwmon->tz_list);
 976         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 977         hwmon->device = hwmon_device_register(NULL);
 978         if (IS_ERR(hwmon->device)) {
 979                 result = PTR_ERR(hwmon->device);
 980                 goto free_mem;
 981         }
 982         dev_set_drvdata(hwmon->device, hwmon);
 983         result = device_create_file(hwmon->device, &dev_attr_name);
 984         if (result)
 985                 goto free_mem;
 986
 987  register_sys_interface:
 988         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 989         if (!temp) {
 990                 result = -ENOMEM;
 991                 goto unregister_name;
 992         }
 993
 994         temp->tz = tz;
 995         hwmon->count++;
 996
 997         snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
 998                  "temp%d_input", hwmon->count);
 999         temp->temp_input.attr.attr.name = temp->temp_input.name;
1000         temp->temp_input.attr.attr.mode = 0444;
1001         temp->temp_input.attr.show = temp_input_show;
1002         sysfs_attr_init(&temp->temp_input.attr.attr);
1003         result = device_create_file(hwmon->device, &temp->temp_input.attr);
1004         if (result)
1005                 goto free_temp_mem;
1006
1007         if (tz->ops->get_crit_temp) {
1008                 unsigned long temperature;
1009                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
1010                         snprintf(temp->temp_crit.name,
1011                                  sizeof(temp->temp_crit.name),
1012                                 "temp%d_crit", hwmon->count);
1013                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
1014                         temp->temp_crit.attr.attr.mode = 0444;
1015                         temp->temp_crit.attr.show = temp_crit_show;
1016                         sysfs_attr_init(&temp->temp_crit.attr.attr);
1017                         result = device_create_file(hwmon->device,
1018                                                     &temp->temp_crit.attr);
1019                         if (result)
1020                                 goto unregister_input;
1021                 }
1022         }
1023
1024         mutex_lock(&thermal_list_lock);
1025         if (new_hwmon_device)
1026                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
1027         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
1028         mutex_unlock(&thermal_list_lock);
1029
1030         return 0;
1031
1032  unregister_input:
1033         device_remove_file(hwmon->device, &temp->temp_input.attr);
1034  free_temp_mem:
1035         kfree(temp);
1036  unregister_name:
1037         if (new_hwmon_device) {
1038                 device_remove_file(hwmon->device, &dev_attr_name);
1039                 hwmon_device_unregister(hwmon->device);
1040         }
1041  free_mem:
1042         if (new_hwmon_device)
1043                 kfree(hwmon);
1044
1045         return result;
1046 }
1047
1048 static void
1049 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1050 {
1051         struct thermal_hwmon_device *hwmon;
1052         struct thermal_hwmon_temp *temp;
1053
1054         hwmon = thermal_hwmon_lookup_by_type(tz);
1055         if (unlikely(!hwmon)) {
1056                 /* Should never happen... */
1057                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
1058                 return;
1059         }
1060
1061         temp = thermal_hwmon_lookup_temp(hwmon, tz);
1062         if (unlikely(!temp)) {
1063                 /* Should never happen... */
1064                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
1065                 return;
1066         }
1067
1068         device_remove_file(hwmon->device, &temp->temp_input.attr);
1069         if (tz->ops->get_crit_temp)
1070                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
1071
1072         mutex_lock(&thermal_list_lock);
1073         list_del(&temp->hwmon_node);
1074         kfree(temp);
1075         if (!list_empty(&hwmon->tz_list)) {
1076                 mutex_unlock(&thermal_list_lock);
1077                 return;
1078         }
1079         list_del(&hwmon->node);
1080         mutex_unlock(&thermal_list_lock);
1081
1082         device_remove_file(hwmon->device, &dev_attr_name);
1083         hwmon_device_unregister(hwmon->device);
1084         kfree(hwmon);
1085 }
1086 #else
1087 static int
1088 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
1089 {
1090         return 0;
1091 }
1092
1093 static void
1094 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1095 {
1096 }
1097 #endif
1098
1099 /**
1100  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
1101  * @tz:         thermal zone device
1102  * @trip:       indicates which trip point the cooling devices is
1103  *              associated with in this thermal zone.
1104  * @cdev:       thermal cooling device
1105  *
1106  * This function is usually called in the thermal zone device .bind callback.
1107  */
1108 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1109                                      int trip,
1110                                      struct thermal_cooling_device *cdev,
1111                                      unsigned long upper, unsigned long lower)
1112 {
1113         struct thermal_instance *dev;
1114         struct thermal_instance *pos;
1115         struct thermal_zone_device *pos1;
1116         struct thermal_cooling_device *pos2;
1117         unsigned long max_state;
1118         int result;
1119
1120         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1121                 return -EINVAL;
1122
1123         list_for_each_entry(pos1, &thermal_tz_list, node) {
1124                 if (pos1 == tz)
1125                         break;
1126         }
1127         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1128                 if (pos2 == cdev)
1129                         break;
1130         }
1131
1132         if (tz != pos1 || cdev != pos2)
1133                 return -EINVAL;
1134
1135         cdev->ops->get_max_state(cdev, &max_state);
1136
1137         /* lower default 0, upper default max_state */
1138         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1139         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1140
1141         if (lower > upper || upper > max_state)
1142                 return -EINVAL;
1143
1144         dev =
1145             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1146         if (!dev)
1147                 return -ENOMEM;
1148         dev->tz = tz;
1149         dev->cdev = cdev;
1150         dev->trip = trip;
1151         dev->upper = upper;
1152         dev->lower = lower;
1153         dev->target = THERMAL_NO_TARGET;
1154
1155         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1156         if (result)
1157                 goto free_mem;
1158
1159         sprintf(dev->name, "cdev%d", dev->id);
1160         result =
1161             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1162         if (result)
1163                 goto release_idr;
1164
1165         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1166         sysfs_attr_init(&dev->attr.attr);
1167         dev->attr.attr.name = dev->attr_name;
1168         dev->attr.attr.mode = 0444;
1169         dev->attr.show = thermal_cooling_device_trip_point_show;
1170         result = device_create_file(&tz->device, &dev->attr);
1171         if (result)
1172                 goto remove_symbol_link;
1173
1174         mutex_lock(&tz->lock);
1175         mutex_lock(&cdev->lock);
1176         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1177             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1178                 result = -EEXIST;
1179                 break;
1180         }
1181         if (!result) {
1182                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1183                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1184         }
1185         mutex_unlock(&cdev->lock);
1186         mutex_unlock(&tz->lock);
1187
1188         if (!result)
1189                 return 0;
1190
1191         device_remove_file(&tz->device, &dev->attr);
1192 remove_symbol_link:
1193         sysfs_remove_link(&tz->device.kobj, dev->name);
1194 release_idr:
1195         release_idr(&tz->idr, &tz->lock, dev->id);
1196 free_mem:
1197         kfree(dev);
1198         return result;
1199 }
1200 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
1201
1202 /**
1203  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
1204  * @tz:         thermal zone device
1205  * @trip:       indicates which trip point the cooling devices is
1206  *              associated with in this thermal zone.
1207  * @cdev:       thermal cooling device
1208  *
1209  * This function is usually called in the thermal zone device .unbind callback.
1210  */
1211 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1212                                        int trip,
1213                                        struct thermal_cooling_device *cdev)
1214 {
1215         struct thermal_instance *pos, *next;
1216
1217         mutex_lock(&tz->lock);
1218         mutex_lock(&cdev->lock);
1219         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1220                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1221                         list_del(&pos->tz_node);
1222                         list_del(&pos->cdev_node);
1223                         mutex_unlock(&cdev->lock);
1224                         mutex_unlock(&tz->lock);
1225                         goto unbind;
1226                 }
1227         }
1228         mutex_unlock(&cdev->lock);
1229         mutex_unlock(&tz->lock);
1230
1231         return -ENODEV;
1232
1233 unbind:
1234         device_remove_file(&tz->device, &pos->attr);
1235         sysfs_remove_link(&tz->device.kobj, pos->name);
1236         release_idr(&tz->idr, &tz->lock, pos->id);
1237         kfree(pos);
1238         return 0;
1239 }
1240 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
1241
1242 static void thermal_release(struct device *dev)
1243 {
1244         struct thermal_zone_device *tz;
1245         struct thermal_cooling_device *cdev;
1246
1247         if (!strncmp(dev_name(dev), "thermal_zone",
1248                      sizeof("thermal_zone") - 1)) {
1249                 tz = to_thermal_zone(dev);
1250                 kfree(tz);
1251         } else {
1252                 cdev = to_cooling_device(dev);
1253                 kfree(cdev);
1254         }
1255 }
1256
1257 static struct class thermal_class = {
1258         .name = "thermal",
1259         .dev_release = thermal_release,
1260 };
1261
1262 /**
1263  * thermal_cooling_device_register - register a new thermal cooling device
1264  * @type:       the thermal cooling device type.
1265  * @devdata:    device private data.
1266  * @ops:                standard thermal cooling devices callbacks.
1267  */
1268 struct thermal_cooling_device *
1269 thermal_cooling_device_register(char *type, void *devdata,
1270                                 const struct thermal_cooling_device_ops *ops)
1271 {
1272         struct thermal_cooling_device *cdev;
1273         int result;
1274
1275         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1276                 return ERR_PTR(-EINVAL);
1277
1278         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1279             !ops->set_cur_state)
1280                 return ERR_PTR(-EINVAL);
1281
1282         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1283         if (!cdev)
1284                 return ERR_PTR(-ENOMEM);
1285
1286         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1287         if (result) {
1288                 kfree(cdev);
1289                 return ERR_PTR(result);
1290         }
1291
1292         strcpy(cdev->type, type ? : "");
1293         mutex_init(&cdev->lock);
1294         INIT_LIST_HEAD(&cdev->thermal_instances);
1295         cdev->ops = ops;
1296         cdev->updated = true;
1297         cdev->device.class = &thermal_class;
1298         cdev->devdata = devdata;
1299         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1300         result = device_register(&cdev->device);
1301         if (result) {
1302                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1303                 kfree(cdev);
1304                 return ERR_PTR(result);
1305         }
1306
1307         /* sys I/F */
1308         if (type) {
1309                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1310                 if (result)
1311                         goto unregister;
1312         }
1313
1314         result = device_create_file(&cdev->device, &dev_attr_max_state);
1315         if (result)
1316                 goto unregister;
1317
1318         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1319         if (result)
1320                 goto unregister;
1321
1322         /* Add 'this' new cdev to the global cdev list */
1323         mutex_lock(&thermal_list_lock);
1324         list_add(&cdev->node, &thermal_cdev_list);
1325         mutex_unlock(&thermal_list_lock);
1326
1327         /* Update binding information for 'this' new cdev */
1328         bind_cdev(cdev);
1329
1330         return cdev;
1331
1332 unregister:
1333         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1334         device_unregister(&cdev->device);
1335         return ERR_PTR(result);
1336 }
1337 EXPORT_SYMBOL(thermal_cooling_device_register);
1338
1339 /**
1340  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1341  * @cdev:       the thermal cooling device to remove.
1342  *
1343  * thermal_cooling_device_unregister() must be called when the device is no
1344  * longer needed.
1345  */
1346 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1347 {
1348         int i;
1349         const struct thermal_zone_params *tzp;
1350         struct thermal_zone_device *tz;
1351         struct thermal_cooling_device *pos = NULL;
1352
1353         if (!cdev)
1354                 return;
1355
1356         mutex_lock(&thermal_list_lock);
1357         list_for_each_entry(pos, &thermal_cdev_list, node)
1358             if (pos == cdev)
1359                 break;
1360         if (pos != cdev) {
1361                 /* thermal cooling device not found */
1362                 mutex_unlock(&thermal_list_lock);
1363                 return;
1364         }
1365         list_del(&cdev->node);
1366
1367         /* Unbind all thermal zones associated with 'this' cdev */
1368         list_for_each_entry(tz, &thermal_tz_list, node) {
1369                 if (tz->ops->unbind) {
1370                         tz->ops->unbind(tz, cdev);
1371                         continue;
1372                 }
1373
1374                 if (!tz->tzp || !tz->tzp->tbp)
1375                         continue;
1376
1377                 tzp = tz->tzp;
1378                 for (i = 0; i < tzp->num_tbps; i++) {
1379                         if (tzp->tbp[i].cdev == cdev) {
1380                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1381                                 tzp->tbp[i].cdev = NULL;
1382                         }
1383                 }
1384         }
1385
1386         mutex_unlock(&thermal_list_lock);
1387
1388         if (cdev->type[0])
1389                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1390         device_remove_file(&cdev->device, &dev_attr_max_state);
1391         device_remove_file(&cdev->device, &dev_attr_cur_state);
1392
1393         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1394         device_unregister(&cdev->device);
1395         return;
1396 }
1397 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1398
1399 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1400 {
1401         struct thermal_instance *instance;
1402         unsigned long target = 0;
1403
1404         /* cooling device is updated*/
1405         if (cdev->updated)
1406                 return;
1407
1408         mutex_lock(&cdev->lock);
1409         /* Make sure cdev enters the deepest cooling state */
1410         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1411                 if (instance->target == THERMAL_NO_TARGET)
1412                         continue;
1413                 if (instance->target > target)
1414                         target = instance->target;
1415         }
1416         mutex_unlock(&cdev->lock);
1417         cdev->ops->set_cur_state(cdev, target);
1418         cdev->updated = true;
1419 }
1420 EXPORT_SYMBOL(thermal_cdev_update);
1421
1422 /**
1423  * notify_thermal_framework - Sensor drivers use this API to notify framework
1424  * @tz:         thermal zone device
1425  * @trip:       indicates which trip point has been crossed
1426  *
1427  * This function handles the trip events from sensor drivers. It starts
1428  * throttling the cooling devices according to the policy configured.
1429  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1430  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1431  * The throttling policy is based on the configured platform data; if no
1432  * platform data is provided, this uses the step_wise throttling policy.
1433  */
1434 void notify_thermal_framework(struct thermal_zone_device *tz, int trip)
1435 {
1436         handle_thermal_trip(tz, trip);
1437 }
1438 EXPORT_SYMBOL(notify_thermal_framework);
1439
1440 /**
1441  * create_trip_attrs - create attributes for trip points
1442  * @tz:         the thermal zone device
1443  * @mask:       Writeable trip point bitmap.
1444  */
1445 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1446 {
1447         int indx;
1448         int size = sizeof(struct thermal_attr) * tz->trips;
1449
1450         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1451         if (!tz->trip_type_attrs)
1452                 return -ENOMEM;
1453
1454         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1455         if (!tz->trip_temp_attrs) {
1456                 kfree(tz->trip_type_attrs);
1457                 return -ENOMEM;
1458         }
1459
1460         if (tz->ops->get_trip_hyst) {
1461                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1462                 if (!tz->trip_hyst_attrs) {
1463                         kfree(tz->trip_type_attrs);
1464                         kfree(tz->trip_temp_attrs);
1465                         return -ENOMEM;
1466                 }
1467         }
1468
1469
1470         for (indx = 0; indx < tz->trips; indx++) {
1471                 /* create trip type attribute */
1472                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1473                          "trip_point_%d_type", indx);
1474
1475                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1476                 tz->trip_type_attrs[indx].attr.attr.name =
1477                                                 tz->trip_type_attrs[indx].name;
1478                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1479                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1480
1481                 device_create_file(&tz->device,
1482                                    &tz->trip_type_attrs[indx].attr);
1483
1484                 /* create trip temp attribute */
1485                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1486                          "trip_point_%d_temp", indx);
1487
1488                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1489                 tz->trip_temp_attrs[indx].attr.attr.name =
1490                                                 tz->trip_temp_attrs[indx].name;
1491                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1492                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1493                 if (mask & (1 << indx)) {
1494                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1495                         tz->trip_temp_attrs[indx].attr.store =
1496                                                         trip_point_temp_store;
1497                 }
1498
1499                 device_create_file(&tz->device,
1500                                    &tz->trip_temp_attrs[indx].attr);
1501
1502                 /* create Optional trip hyst attribute */
1503                 if (!tz->ops->get_trip_hyst)
1504                         continue;
1505                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1506                          "trip_point_%d_hyst", indx);
1507
1508                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1509                 tz->trip_hyst_attrs[indx].attr.attr.name =
1510                                         tz->trip_hyst_attrs[indx].name;
1511                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1512                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1513                 if (tz->ops->set_trip_hyst) {
1514                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1515                         tz->trip_hyst_attrs[indx].attr.store =
1516                                         trip_point_hyst_store;
1517                 }
1518
1519                 device_create_file(&tz->device,
1520                                    &tz->trip_hyst_attrs[indx].attr);
1521         }
1522         return 0;
1523 }
1524
1525 static void remove_trip_attrs(struct thermal_zone_device *tz)
1526 {
1527         int indx;
1528
1529         for (indx = 0; indx < tz->trips; indx++) {
1530                 device_remove_file(&tz->device,
1531                                    &tz->trip_type_attrs[indx].attr);
1532                 device_remove_file(&tz->device,
1533                                    &tz->trip_temp_attrs[indx].attr);
1534                 if (tz->ops->get_trip_hyst)
1535                         device_remove_file(&tz->device,
1536                                   &tz->trip_hyst_attrs[indx].attr);
1537         }
1538         kfree(tz->trip_type_attrs);
1539         kfree(tz->trip_temp_attrs);
1540         kfree(tz->trip_hyst_attrs);
1541 }
1542
1543 /**
1544  * thermal_zone_device_register - register a new thermal zone device
1545  * @type:       the thermal zone device type
1546  * @trips:      the number of trip points the thermal zone support
1547  * @mask:       a bit string indicating the writeablility of trip points
1548  * @devdata:    private device data
1549  * @ops:        standard thermal zone device callbacks
1550  * @tzp:        thermal zone platform parameters
1551  * @passive_delay: number of milliseconds to wait between polls when
1552  *                 performing passive cooling
1553  * @polling_delay: number of milliseconds to wait between polls when checking
1554  *                 whether trip points have been crossed (0 for interrupt
1555  *                 driven systems)
1556  *
1557  * thermal_zone_device_unregister() must be called when the device is no
1558  * longer needed. The passive cooling depends on the .get_trend() return value.
1559  */
1560 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1561         int trips, int mask, void *devdata,
1562         const struct thermal_zone_device_ops *ops,
1563         const struct thermal_zone_params *tzp,
1564         int passive_delay, int polling_delay)
1565 {
1566         struct thermal_zone_device *tz;
1567         enum thermal_trip_type trip_type;
1568         int result;
1569         int count;
1570         int passive = 0;
1571
1572         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1573                 return ERR_PTR(-EINVAL);
1574
1575         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1576                 return ERR_PTR(-EINVAL);
1577
1578         if (!ops || !ops->get_temp)
1579                 return ERR_PTR(-EINVAL);
1580
1581         if (trips > 0 && !ops->get_trip_type)
1582                 return ERR_PTR(-EINVAL);
1583
1584         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1585         if (!tz)
1586                 return ERR_PTR(-ENOMEM);
1587
1588         INIT_LIST_HEAD(&tz->thermal_instances);
1589         idr_init(&tz->idr);
1590         mutex_init(&tz->lock);
1591         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1592         if (result) {
1593                 kfree(tz);
1594                 return ERR_PTR(result);
1595         }
1596
1597         strcpy(tz->type, type ? : "");
1598         tz->ops = ops;
1599         tz->tzp = tzp;
1600         tz->device.class = &thermal_class;
1601         tz->devdata = devdata;
1602         tz->trips = trips;
1603         tz->passive_delay = passive_delay;
1604         tz->polling_delay = polling_delay;
1605
1606         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1607         result = device_register(&tz->device);
1608         if (result) {
1609                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1610                 kfree(tz);
1611                 return ERR_PTR(result);
1612         }
1613
1614         /* sys I/F */
1615         if (type) {
1616                 result = device_create_file(&tz->device, &dev_attr_type);
1617                 if (result)
1618                         goto unregister;
1619         }
1620
1621         result = device_create_file(&tz->device, &dev_attr_temp);
1622         if (result)
1623                 goto unregister;
1624
1625         if (ops->get_mode) {
1626                 result = device_create_file(&tz->device, &dev_attr_mode);
1627                 if (result)
1628                         goto unregister;
1629         }
1630
1631         result = create_trip_attrs(tz, mask);
1632         if (result)
1633                 goto unregister;
1634
1635         for (count = 0; count < trips; count++) {
1636                 tz->ops->get_trip_type(tz, count, &trip_type);
1637                 if (trip_type == THERMAL_TRIP_PASSIVE)
1638                         passive = 1;
1639         }
1640
1641         if (!passive) {
1642                 result = device_create_file(&tz->device, &dev_attr_passive);
1643                 if (result)
1644                         goto unregister;
1645         }
1646
1647 #ifdef CONFIG_THERMAL_EMULATION
1648         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1649         if (result)
1650                 goto unregister;
1651 #endif
1652         /* Create policy attribute */
1653         result = device_create_file(&tz->device, &dev_attr_policy);
1654         if (result)
1655                 goto unregister;
1656
1657         /* Update 'this' zone's governor information */
1658         mutex_lock(&thermal_governor_lock);
1659
1660         if (tz->tzp)
1661                 tz->governor = __find_governor(tz->tzp->governor_name);
1662         else
1663                 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1664
1665         mutex_unlock(&thermal_governor_lock);
1666
1667         result = thermal_add_hwmon_sysfs(tz);
1668         if (result)
1669                 goto unregister;
1670
1671         mutex_lock(&thermal_list_lock);
1672         list_add_tail(&tz->node, &thermal_tz_list);
1673         mutex_unlock(&thermal_list_lock);
1674
1675         /* Bind cooling devices for this zone */
1676         bind_tz(tz);
1677
1678         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1679
1680         thermal_zone_device_update(tz);
1681
1682         if (!result)
1683                 return tz;
1684
1685 unregister:
1686         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1687         device_unregister(&tz->device);
1688         return ERR_PTR(result);
1689 }
1690 EXPORT_SYMBOL(thermal_zone_device_register);
1691
1692 /**
1693  * thermal_device_unregister - removes the registered thermal zone device
1694  * @tz: the thermal zone device to remove
1695  */
1696 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1697 {
1698         int i;
1699         const struct thermal_zone_params *tzp;
1700         struct thermal_cooling_device *cdev;
1701         struct thermal_zone_device *pos = NULL;
1702
1703         if (!tz)
1704                 return;
1705
1706         tzp = tz->tzp;
1707
1708         mutex_lock(&thermal_list_lock);
1709         list_for_each_entry(pos, &thermal_tz_list, node)
1710             if (pos == tz)
1711                 break;
1712         if (pos != tz) {
1713                 /* thermal zone device not found */
1714                 mutex_unlock(&thermal_list_lock);
1715                 return;
1716         }
1717         list_del(&tz->node);
1718
1719         /* Unbind all cdevs associated with 'this' thermal zone */
1720         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1721                 if (tz->ops->unbind) {
1722                         tz->ops->unbind(tz, cdev);
1723                         continue;
1724                 }
1725
1726                 if (!tzp || !tzp->tbp)
1727                         break;
1728
1729                 for (i = 0; i < tzp->num_tbps; i++) {
1730                         if (tzp->tbp[i].cdev == cdev) {
1731                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1732                                 tzp->tbp[i].cdev = NULL;
1733                         }
1734                 }
1735         }
1736
1737         mutex_unlock(&thermal_list_lock);
1738
1739         thermal_zone_device_set_polling(tz, 0);
1740
1741         if (tz->type[0])
1742                 device_remove_file(&tz->device, &dev_attr_type);
1743         device_remove_file(&tz->device, &dev_attr_temp);
1744         if (tz->ops->get_mode)
1745                 device_remove_file(&tz->device, &dev_attr_mode);
1746         device_remove_file(&tz->device, &dev_attr_policy);
1747         remove_trip_attrs(tz);
1748         tz->governor = NULL;
1749
1750         thermal_remove_hwmon_sysfs(tz);
1751         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1752         idr_destroy(&tz->idr);
1753         mutex_destroy(&tz->lock);
1754         device_unregister(&tz->device);
1755         return;
1756 }
1757 EXPORT_SYMBOL(thermal_zone_device_unregister);
1758
1759 #ifdef CONFIG_NET
1760 static struct genl_family thermal_event_genl_family = {
1761         .id = GENL_ID_GENERATE,
1762         .name = THERMAL_GENL_FAMILY_NAME,
1763         .version = THERMAL_GENL_VERSION,
1764         .maxattr = THERMAL_GENL_ATTR_MAX,
1765 };
1766
1767 static struct genl_multicast_group thermal_event_mcgrp = {
1768         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1769 };
1770
1771 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1772                                         enum events event)
1773 {
1774         struct sk_buff *skb;
1775         struct nlattr *attr;
1776         struct thermal_genl_event *thermal_event;
1777         void *msg_header;
1778         int size;
1779         int result;
1780         static unsigned int thermal_event_seqnum;
1781
1782         if (!tz)
1783                 return -EINVAL;
1784
1785         /* allocate memory */
1786         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1787                nla_total_size(0);
1788
1789         skb = genlmsg_new(size, GFP_ATOMIC);
1790         if (!skb)
1791                 return -ENOMEM;
1792
1793         /* add the genetlink message header */
1794         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1795                                  &thermal_event_genl_family, 0,
1796                                  THERMAL_GENL_CMD_EVENT);
1797         if (!msg_header) {
1798                 nlmsg_free(skb);
1799                 return -ENOMEM;
1800         }
1801
1802         /* fill the data */
1803         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1804                            sizeof(struct thermal_genl_event));
1805
1806         if (!attr) {
1807                 nlmsg_free(skb);
1808                 return -EINVAL;
1809         }
1810
1811         thermal_event = nla_data(attr);
1812         if (!thermal_event) {
1813                 nlmsg_free(skb);
1814                 return -EINVAL;
1815         }
1816
1817         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1818
1819         thermal_event->orig = tz->id;
1820         thermal_event->event = event;
1821
1822         /* send multicast genetlink message */
1823         result = genlmsg_end(skb, msg_header);
1824         if (result < 0) {
1825                 nlmsg_free(skb);
1826                 return result;
1827         }
1828
1829         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1830         if (result)
1831                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1832
1833         return result;
1834 }
1835 EXPORT_SYMBOL(thermal_generate_netlink_event);
1836
1837 static int genetlink_init(void)
1838 {
1839         int result;
1840
1841         result = genl_register_family(&thermal_event_genl_family);
1842         if (result)
1843                 return result;
1844
1845         result = genl_register_mc_group(&thermal_event_genl_family,
1846                                         &thermal_event_mcgrp);
1847         if (result)
1848                 genl_unregister_family(&thermal_event_genl_family);
1849         return result;
1850 }
1851
1852 static void genetlink_exit(void)
1853 {
1854         genl_unregister_family(&thermal_event_genl_family);
1855 }
1856 #else /* !CONFIG_NET */
1857 static inline int genetlink_init(void) { return 0; }
1858 static inline void genetlink_exit(void) {}
1859 #endif /* !CONFIG_NET */
1860
1861 static int __init thermal_init(void)
1862 {
1863         int result = 0;
1864
1865         result = class_register(&thermal_class);
1866         if (result) {
1867                 idr_destroy(&thermal_tz_idr);
1868                 idr_destroy(&thermal_cdev_idr);
1869                 mutex_destroy(&thermal_idr_lock);
1870                 mutex_destroy(&thermal_list_lock);
1871                 return result;
1872         }
1873         result = genetlink_init();
1874         return result;
1875 }
1876
1877 static void __exit thermal_exit(void)
1878 {
1879         class_unregister(&thermal_class);
1880         idr_destroy(&thermal_tz_idr);
1881         idr_destroy(&thermal_cdev_idr);
1882         mutex_destroy(&thermal_idr_lock);
1883         mutex_destroy(&thermal_list_lock);
1884         genetlink_exit();
1885 }
1886
1887 fs_initcall(thermal_init);
1888 module_exit(thermal_exit);