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/spinlock.h>
  36 #include <linux/reboot.h>
  37 #include <net/netlink.h>
  38 #include <net/genetlink.h>
  39
  40 #include "thermal_core.h"
  41
  42 MODULE_AUTHOR("Zhang Rui");
  43 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  44 MODULE_LICENSE("GPL");
  45
  46 static DEFINE_IDR(thermal_tz_idr);
  47 static DEFINE_IDR(thermal_cdev_idr);
  48 static DEFINE_MUTEX(thermal_idr_lock);
  49
  50 static LIST_HEAD(thermal_tz_list);
  51 static LIST_HEAD(thermal_cdev_list);
  52 static LIST_HEAD(thermal_governor_list);
  53
  54 static DEFINE_MUTEX(thermal_list_lock);
  55 static DEFINE_MUTEX(thermal_governor_lock);
  56
  57 static struct thermal_governor *__find_governor(const char *name)
  58 {
  59         struct thermal_governor *pos;
  60
  61         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  62                 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
  63                         return pos;
  64
  65         return NULL;
  66 }
  67
  68 int thermal_register_governor(struct thermal_governor *governor)
  69 {
  70         int err;
  71         const char *name;
  72         struct thermal_zone_device *pos;
  73
  74         if (!governor)
  75                 return -EINVAL;
  76
  77         mutex_lock(&thermal_governor_lock);
  78
  79         err = -EBUSY;
  80         if (__find_governor(governor->name) == NULL) {
  81                 err = 0;
  82                 list_add(&governor->governor_list, &thermal_governor_list);
  83         }
  84
  85         mutex_lock(&thermal_list_lock);
  86
  87         list_for_each_entry(pos, &thermal_tz_list, node) {
  88                 if (pos->governor)
  89                         continue;
  90                 if (pos->tzp)
  91                         name = pos->tzp->governor_name;
  92                 else
  93                         name = DEFAULT_THERMAL_GOVERNOR;
  94                 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
  95                         pos->governor = governor;
  96         }
  97
  98         mutex_unlock(&thermal_list_lock);
  99         mutex_unlock(&thermal_governor_lock);
 100
 101         return err;
 102 }
 103 EXPORT_SYMBOL_GPL(thermal_register_governor);
 104
 105 void thermal_unregister_governor(struct thermal_governor *governor)
 106 {
 107         struct thermal_zone_device *pos;
 108
 109         if (!governor)
 110                 return;
 111
 112         mutex_lock(&thermal_governor_lock);
 113
 114         if (__find_governor(governor->name) == NULL)
 115                 goto exit;
 116
 117         mutex_lock(&thermal_list_lock);
 118
 119         list_for_each_entry(pos, &thermal_tz_list, node) {
 120                 if (!strnicmp(pos->governor->name, governor->name,
 121                                                 THERMAL_NAME_LENGTH))
 122                         pos->governor = NULL;
 123         }
 124
 125         mutex_unlock(&thermal_list_lock);
 126         list_del(&governor->governor_list);
 127 exit:
 128         mutex_unlock(&thermal_governor_lock);
 129         return;
 130 }
 131 EXPORT_SYMBOL_GPL(thermal_unregister_governor);
 132
 133 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 134 {
 135         int err;
 136
 137 again:
 138         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
 139                 return -ENOMEM;
 140
 141         if (lock)
 142                 mutex_lock(lock);
 143         err = idr_get_new(idr, NULL, id);
 144         if (lock)
 145                 mutex_unlock(lock);
 146         if (unlikely(err == -EAGAIN))
 147                 goto again;
 148         else if (unlikely(err))
 149                 return err;
 150
 151         *id = *id & MAX_IDR_MASK;
 152         return 0;
 153 }
 154
 155 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 156 {
 157         if (lock)
 158                 mutex_lock(lock);
 159         idr_remove(idr, id);
 160         if (lock)
 161                 mutex_unlock(lock);
 162 }
 163
 164 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 165 {
 166         enum thermal_trend trend;
 167
 168         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
 169                 if (tz->temperature > tz->last_temperature)
 170                         trend = THERMAL_TREND_RAISING;
 171                 else if (tz->temperature < tz->last_temperature)
 172                         trend = THERMAL_TREND_DROPPING;
 173                 else
 174                         trend = THERMAL_TREND_STABLE;
 175         }
 176
 177         return trend;
 178 }
 179 EXPORT_SYMBOL(get_tz_trend);
 180
 181 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 182                         struct thermal_cooling_device *cdev, int trip)
 183 {
 184         struct thermal_instance *pos = NULL;
 185         struct thermal_instance *target_instance = NULL;
 186
 187         mutex_lock(&tz->lock);
 188         mutex_lock(&cdev->lock);
 189
 190         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 191                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 192                         target_instance = pos;
 193                         break;
 194                 }
 195         }
 196
 197         mutex_unlock(&cdev->lock);
 198         mutex_unlock(&tz->lock);
 199
 200         return target_instance;
 201 }
 202 EXPORT_SYMBOL(get_thermal_instance);
 203
 204 static void print_bind_err_msg(struct thermal_zone_device *tz,
 205                         struct thermal_cooling_device *cdev, int ret)
 206 {
 207         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 208                                 tz->type, cdev->type, ret);
 209 }
 210
 211 static void __bind(struct thermal_zone_device *tz, int mask,
 212                         struct thermal_cooling_device *cdev)
 213 {
 214         int i, ret;
 215
 216         for (i = 0; i < tz->trips; i++) {
 217                 if (mask & (1 << i)) {
 218                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 219                                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 220                         if (ret)
 221                                 print_bind_err_msg(tz, cdev, ret);
 222                 }
 223         }
 224 }
 225
 226 static void __unbind(struct thermal_zone_device *tz, int mask,
 227                         struct thermal_cooling_device *cdev)
 228 {
 229         int i;
 230
 231         for (i = 0; i < tz->trips; i++)
 232                 if (mask & (1 << i))
 233                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 234 }
 235
 236 static void bind_cdev(struct thermal_cooling_device *cdev)
 237 {
 238         int i, ret;
 239         const struct thermal_zone_params *tzp;
 240         struct thermal_zone_device *pos = NULL;
 241
 242         mutex_lock(&thermal_list_lock);
 243
 244         list_for_each_entry(pos, &thermal_tz_list, node) {
 245                 if (!pos->tzp && !pos->ops->bind)
 246                         continue;
 247
 248                 if (!pos->tzp && pos->ops->bind) {
 249                         ret = pos->ops->bind(pos, cdev);
 250                         if (ret)
 251                                 print_bind_err_msg(pos, cdev, ret);
 252                 }
 253
 254                 tzp = pos->tzp;
 255                 if (!tzp->tbp)
 256                         return;
 257
 258                 for (i = 0; i < tzp->num_tbps; i++) {
 259                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 260                                 continue;
 261                         if (tzp->tbp[i].match(pos, cdev))
 262                                 continue;
 263                         tzp->tbp[i].cdev = cdev;
 264                         __bind(pos, tzp->tbp[i].trip_mask, cdev);
 265                 }
 266         }
 267
 268         mutex_unlock(&thermal_list_lock);
 269 }
 270
 271 static void bind_tz(struct thermal_zone_device *tz)
 272 {
 273         int i, ret;
 274         struct thermal_cooling_device *pos = NULL;
 275         const struct thermal_zone_params *tzp = tz->tzp;
 276
 277         if (!tzp && !tz->ops->bind)
 278                 return;
 279
 280         mutex_lock(&thermal_list_lock);
 281
 282         /* If there is no platform data, try to use ops->bind */
 283         if (!tzp && tz->ops->bind) {
 284                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 285                         ret = tz->ops->bind(tz, pos);
 286                         if (ret)
 287                                 print_bind_err_msg(tz, pos, ret);
 288                 }
 289                 goto exit;
 290         }
 291
 292         if (!tzp->tbp)
 293                 goto exit;
 294
 295         list_for_each_entry(pos, &thermal_cdev_list, node) {
 296                 for (i = 0; i < tzp->num_tbps; i++) {
 297                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 298                                 continue;
 299                         if (tzp->tbp[i].match(tz, pos))
 300                                 continue;
 301                         tzp->tbp[i].cdev = pos;
 302                         __bind(tz, tzp->tbp[i].trip_mask, pos);
 303                 }
 304         }
 305 exit:
 306         mutex_unlock(&thermal_list_lock);
 307 }
 308
 309 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 310                                             int delay)
 311 {
 312         if (delay > 1000)
 313                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 314                                  round_jiffies(msecs_to_jiffies(delay)));
 315         else if (delay)
 316                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 317                                  msecs_to_jiffies(delay));
 318         else
 319                 cancel_delayed_work(&tz->poll_queue);
 320 }
 321
 322 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 323 {
 324         mutex_lock(&tz->lock);
 325
 326         if (tz->passive)
 327                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 328         else if (tz->polling_delay)
 329                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 330         else
 331                 thermal_zone_device_set_polling(tz, 0);
 332
 333         mutex_unlock(&tz->lock);
 334 }
 335
 336 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 337                         int trip, enum thermal_trip_type trip_type)
 338 {
 339         tz->governor->throttle(tz, trip);
 340 }
 341
 342 static void handle_critical_trips(struct thermal_zone_device *tz,
 343                                 int trip, enum thermal_trip_type trip_type)
 344 {
 345         long trip_temp;
 346
 347         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 348
 349         /* If we have not crossed the trip_temp, we do not care. */
 350         if (tz->temperature < trip_temp)
 351                 return;
 352
 353         if (tz->ops->notify)
 354                 tz->ops->notify(tz, trip, trip_type);
 355
 356         if (trip_type == THERMAL_TRIP_CRITICAL) {
 357                 pr_emerg("Critical temperature reached(%d C),shutting down\n",
 358                          tz->temperature / 1000);
 359                 orderly_poweroff(true);
 360         }
 361 }
 362
 363 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 364 {
 365         enum thermal_trip_type type;
 366
 367         tz->ops->get_trip_type(tz, trip, &type);
 368
 369         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 370                 handle_critical_trips(tz, trip, type);
 371         else
 372                 handle_non_critical_trips(tz, trip, type);
 373         /*
 374          * Alright, we handled this trip successfully.
 375          * So, start monitoring again.
 376          */
 377         monitor_thermal_zone(tz);
 378 }
 379
 380 static void update_temperature(struct thermal_zone_device *tz)
 381 {
 382         long temp;
 383         int ret;
 384
 385         mutex_lock(&tz->lock);
 386
 387         ret = tz->ops->get_temp(tz, &temp);
 388         if (ret) {
 389                 pr_warn("failed to read out thermal zone %d\n", tz->id);
 390                 return;
 391         }
 392
 393         tz->last_temperature = tz->temperature;
 394         tz->temperature = temp;
 395
 396         mutex_unlock(&tz->lock);
 397 }
 398
 399 void thermal_zone_device_update(struct thermal_zone_device *tz)
 400 {
 401         int count;
 402
 403         update_temperature(tz);
 404
 405         for (count = 0; count < tz->trips; count++)
 406                 handle_thermal_trip(tz, count);
 407 }
 408 EXPORT_SYMBOL(thermal_zone_device_update);
 409
 410 static void thermal_zone_device_check(struct work_struct *work)
 411 {
 412         struct thermal_zone_device *tz = container_of(work, struct
 413                                                       thermal_zone_device,
 414                                                       poll_queue.work);
 415         thermal_zone_device_update(tz);
 416 }
 417
 418 /* sys I/F for thermal zone */
 419
 420 #define to_thermal_zone(_dev) \
 421         container_of(_dev, struct thermal_zone_device, device)
 422
 423 static ssize_t
 424 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 425 {
 426         struct thermal_zone_device *tz = to_thermal_zone(dev);
 427
 428         return sprintf(buf, "%s\n", tz->type);
 429 }
 430
 431 static ssize_t
 432 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 433 {
 434         struct thermal_zone_device *tz = to_thermal_zone(dev);
 435         long temperature;
 436         int ret;
 437
 438         if (!tz->ops->get_temp)
 439                 return -EPERM;
 440
 441         ret = tz->ops->get_temp(tz, &temperature);
 442
 443         if (ret)
 444                 return ret;
 445
 446         return sprintf(buf, "%ld\n", temperature);
 447 }
 448
 449 static ssize_t
 450 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 451 {
 452         struct thermal_zone_device *tz = to_thermal_zone(dev);
 453         enum thermal_device_mode mode;
 454         int result;
 455
 456         if (!tz->ops->get_mode)
 457                 return -EPERM;
 458
 459         result = tz->ops->get_mode(tz, &mode);
 460         if (result)
 461                 return result;
 462
 463         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 464                        : "disabled");
 465 }
 466
 467 static ssize_t
 468 mode_store(struct device *dev, struct device_attribute *attr,
 469            const char *buf, size_t count)
 470 {
 471         struct thermal_zone_device *tz = to_thermal_zone(dev);
 472         int result;
 473
 474         if (!tz->ops->set_mode)
 475                 return -EPERM;
 476
 477         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 478                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 479         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 480                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 481         else
 482                 result = -EINVAL;
 483
 484         if (result)
 485                 return result;
 486
 487         return count;
 488 }
 489
 490 static ssize_t
 491 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 492                      char *buf)
 493 {
 494         struct thermal_zone_device *tz = to_thermal_zone(dev);
 495         enum thermal_trip_type type;
 496         int trip, result;
 497
 498         if (!tz->ops->get_trip_type)
 499                 return -EPERM;
 500
 501         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 502                 return -EINVAL;
 503
 504         result = tz->ops->get_trip_type(tz, trip, &type);
 505         if (result)
 506                 return result;
 507
 508         switch (type) {
 509         case THERMAL_TRIP_CRITICAL:
 510                 return sprintf(buf, "critical\n");
 511         case THERMAL_TRIP_HOT:
 512                 return sprintf(buf, "hot\n");
 513         case THERMAL_TRIP_PASSIVE:
 514                 return sprintf(buf, "passive\n");
 515         case THERMAL_TRIP_ACTIVE:
 516                 return sprintf(buf, "active\n");
 517         default:
 518                 return sprintf(buf, "unknown\n");
 519         }
 520 }
 521
 522 static ssize_t
 523 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 524                      const char *buf, size_t count)
 525 {
 526         struct thermal_zone_device *tz = to_thermal_zone(dev);
 527         int trip, ret;
 528         unsigned long temperature;
 529
 530         if (!tz->ops->set_trip_temp)
 531                 return -EPERM;
 532
 533         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 534                 return -EINVAL;
 535
 536         if (kstrtoul(buf, 10, &temperature))
 537                 return -EINVAL;
 538
 539         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 540
 541         return ret ? ret : count;
 542 }
 543
 544 static ssize_t
 545 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 546                      char *buf)
 547 {
 548         struct thermal_zone_device *tz = to_thermal_zone(dev);
 549         int trip, ret;
 550         long temperature;
 551
 552         if (!tz->ops->get_trip_temp)
 553                 return -EPERM;
 554
 555         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 556                 return -EINVAL;
 557
 558         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 559
 560         if (ret)
 561                 return ret;
 562
 563         return sprintf(buf, "%ld\n", temperature);
 564 }
 565
 566 static ssize_t
 567 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 568                         const char *buf, size_t count)
 569 {
 570         struct thermal_zone_device *tz = to_thermal_zone(dev);
 571         int trip, ret;
 572         unsigned long temperature;
 573
 574         if (!tz->ops->set_trip_hyst)
 575                 return -EPERM;
 576
 577         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 578                 return -EINVAL;
 579
 580         if (kstrtoul(buf, 10, &temperature))
 581                 return -EINVAL;
 582
 583         /*
 584          * We are not doing any check on the 'temperature' value
 585          * here. The driver implementing 'set_trip_hyst' has to
 586          * take care of this.
 587          */
 588         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 589
 590         return ret ? ret : count;
 591 }
 592
 593 static ssize_t
 594 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 595                         char *buf)
 596 {
 597         struct thermal_zone_device *tz = to_thermal_zone(dev);
 598         int trip, ret;
 599         unsigned long temperature;
 600
 601         if (!tz->ops->get_trip_hyst)
 602                 return -EPERM;
 603
 604         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 605                 return -EINVAL;
 606
 607         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 608
 609         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 610 }
 611
 612 static ssize_t
 613 passive_store(struct device *dev, struct device_attribute *attr,
 614                     const char *buf, size_t count)
 615 {
 616         struct thermal_zone_device *tz = to_thermal_zone(dev);
 617         struct thermal_cooling_device *cdev = NULL;
 618         int state;
 619
 620         if (!sscanf(buf, "%d\n", &state))
 621                 return -EINVAL;
 622
 623         /* sanity check: values below 1000 millicelcius don't make sense
 624          * and can cause the system to go into a thermal heart attack
 625          */
 626         if (state && state < 1000)
 627                 return -EINVAL;
 628
 629         if (state && !tz->forced_passive) {
 630                 mutex_lock(&thermal_list_lock);
 631                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 632                         if (!strncmp("Processor", cdev->type,
 633                                      sizeof("Processor")))
 634                                 thermal_zone_bind_cooling_device(tz,
 635                                                 THERMAL_TRIPS_NONE, cdev,
 636                                                 THERMAL_NO_LIMIT,
 637                                                 THERMAL_NO_LIMIT);
 638                 }
 639                 mutex_unlock(&thermal_list_lock);
 640                 if (!tz->passive_delay)
 641                         tz->passive_delay = 1000;
 642         } else if (!state && tz->forced_passive) {
 643                 mutex_lock(&thermal_list_lock);
 644                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 645                         if (!strncmp("Processor", cdev->type,
 646                                      sizeof("Processor")))
 647                                 thermal_zone_unbind_cooling_device(tz,
 648                                                                    THERMAL_TRIPS_NONE,
 649                                                                    cdev);
 650                 }
 651                 mutex_unlock(&thermal_list_lock);
 652                 tz->passive_delay = 0;
 653         }
 654
 655         tz->forced_passive = state;
 656
 657         thermal_zone_device_update(tz);
 658
 659         return count;
 660 }
 661
 662 static ssize_t
 663 passive_show(struct device *dev, struct device_attribute *attr,
 664                    char *buf)
 665 {
 666         struct thermal_zone_device *tz = to_thermal_zone(dev);
 667
 668         return sprintf(buf, "%d\n", tz->forced_passive);
 669 }
 670
 671 static ssize_t
 672 policy_store(struct device *dev, struct device_attribute *attr,
 673                     const char *buf, size_t count)
 674 {
 675         int ret = -EINVAL;
 676         struct thermal_zone_device *tz = to_thermal_zone(dev);
 677         struct thermal_governor *gov;
 678
 679         mutex_lock(&thermal_governor_lock);
 680
 681         gov = __find_governor(buf);
 682         if (!gov)
 683                 goto exit;
 684
 685         tz->governor = gov;
 686         ret = count;
 687
 688 exit:
 689         mutex_unlock(&thermal_governor_lock);
 690         return ret;
 691 }
 692
 693 static ssize_t
 694 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 695 {
 696         struct thermal_zone_device *tz = to_thermal_zone(dev);
 697
 698         return sprintf(buf, "%s\n", tz->governor->name);
 699 }
 700
 701 static DEVICE_ATTR(type, 0444, type_show, NULL);
 702 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 703 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 704 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 705 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 706
 707 /* sys I/F for cooling device */
 708 #define to_cooling_device(_dev) \
 709         container_of(_dev, struct thermal_cooling_device, device)
 710
 711 static ssize_t
 712 thermal_cooling_device_type_show(struct device *dev,
 713                                  struct device_attribute *attr, char *buf)
 714 {
 715         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 716
 717         return sprintf(buf, "%s\n", cdev->type);
 718 }
 719
 720 static ssize_t
 721 thermal_cooling_device_max_state_show(struct device *dev,
 722                                       struct device_attribute *attr, char *buf)
 723 {
 724         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 725         unsigned long state;
 726         int ret;
 727
 728         ret = cdev->ops->get_max_state(cdev, &state);
 729         if (ret)
 730                 return ret;
 731         return sprintf(buf, "%ld\n", state);
 732 }
 733
 734 static ssize_t
 735 thermal_cooling_device_cur_state_show(struct device *dev,
 736                                       struct device_attribute *attr, char *buf)
 737 {
 738         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 739         unsigned long state;
 740         int ret;
 741
 742         ret = cdev->ops->get_cur_state(cdev, &state);
 743         if (ret)
 744                 return ret;
 745         return sprintf(buf, "%ld\n", state);
 746 }
 747
 748 static ssize_t
 749 thermal_cooling_device_cur_state_store(struct device *dev,
 750                                        struct device_attribute *attr,
 751                                        const char *buf, size_t count)
 752 {
 753         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 754         unsigned long state;
 755         int result;
 756
 757         if (!sscanf(buf, "%ld\n", &state))
 758                 return -EINVAL;
 759
 760         if ((long)state < 0)
 761                 return -EINVAL;
 762
 763         result = cdev->ops->set_cur_state(cdev, state);
 764         if (result)
 765                 return result;
 766         return count;
 767 }
 768
 769 static struct device_attribute dev_attr_cdev_type =
 770 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 771 static DEVICE_ATTR(max_state, 0444,
 772                    thermal_cooling_device_max_state_show, NULL);
 773 static DEVICE_ATTR(cur_state, 0644,
 774                    thermal_cooling_device_cur_state_show,
 775                    thermal_cooling_device_cur_state_store);
 776
 777 static ssize_t
 778 thermal_cooling_device_trip_point_show(struct device *dev,
 779                                        struct device_attribute *attr, char *buf)
 780 {
 781         struct thermal_instance *instance;
 782
 783         instance =
 784             container_of(attr, struct thermal_instance, attr);
 785
 786         if (instance->trip == THERMAL_TRIPS_NONE)
 787                 return sprintf(buf, "-1\n");
 788         else
 789                 return sprintf(buf, "%d\n", instance->trip);
 790 }
 791
 792 /* Device management */
 793
 794 #if defined(CONFIG_THERMAL_HWMON)
 795
 796 /* hwmon sys I/F */
 797 #include <linux/hwmon.h>
 798
 799 /* thermal zone devices with the same type share one hwmon device */
 800 struct thermal_hwmon_device {
 801         char type[THERMAL_NAME_LENGTH];
 802         struct device *device;
 803         int count;
 804         struct list_head tz_list;
 805         struct list_head node;
 806 };
 807
 808 struct thermal_hwmon_attr {
 809         struct device_attribute attr;
 810         char name[16];
 811 };
 812
 813 /* one temperature input for each thermal zone */
 814 struct thermal_hwmon_temp {
 815         struct list_head hwmon_node;
 816         struct thermal_zone_device *tz;
 817         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 818         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 819 };
 820
 821 static LIST_HEAD(thermal_hwmon_list);
 822
 823 static ssize_t
 824 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 825 {
 826         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 827         return sprintf(buf, "%s\n", hwmon->type);
 828 }
 829 static DEVICE_ATTR(name, 0444, name_show, NULL);
 830
 831 static ssize_t
 832 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 833 {
 834         long temperature;
 835         int ret;
 836         struct thermal_hwmon_attr *hwmon_attr
 837                         = container_of(attr, struct thermal_hwmon_attr, attr);
 838         struct thermal_hwmon_temp *temp
 839                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 840                                        temp_input);
 841         struct thermal_zone_device *tz = temp->tz;
 842
 843         ret = tz->ops->get_temp(tz, &temperature);
 844
 845         if (ret)
 846                 return ret;
 847
 848         return sprintf(buf, "%ld\n", temperature);
 849 }
 850
 851 static ssize_t
 852 temp_crit_show(struct device *dev, struct device_attribute *attr,
 853                 char *buf)
 854 {
 855         struct thermal_hwmon_attr *hwmon_attr
 856                         = container_of(attr, struct thermal_hwmon_attr, attr);
 857         struct thermal_hwmon_temp *temp
 858                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 859                                        temp_crit);
 860         struct thermal_zone_device *tz = temp->tz;
 861         long temperature;
 862         int ret;
 863
 864         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 865         if (ret)
 866                 return ret;
 867
 868         return sprintf(buf, "%ld\n", temperature);
 869 }
 870
 871
 872 static struct thermal_hwmon_device *
 873 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 874 {
 875         struct thermal_hwmon_device *hwmon;
 876
 877         mutex_lock(&thermal_list_lock);
 878         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 879                 if (!strcmp(hwmon->type, tz->type)) {
 880                         mutex_unlock(&thermal_list_lock);
 881                         return hwmon;
 882                 }
 883         mutex_unlock(&thermal_list_lock);
 884
 885         return NULL;
 886 }
 887
 888 /* Find the temperature input matching a given thermal zone */
 889 static struct thermal_hwmon_temp *
 890 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 891                           const struct thermal_zone_device *tz)
 892 {
 893         struct thermal_hwmon_temp *temp;
 894
 895         mutex_lock(&thermal_list_lock);
 896         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 897                 if (temp->tz == tz) {
 898                         mutex_unlock(&thermal_list_lock);
 899                         return temp;
 900                 }
 901         mutex_unlock(&thermal_list_lock);
 902
 903         return NULL;
 904 }
 905
 906 static int
 907 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 908 {
 909         struct thermal_hwmon_device *hwmon;
 910         struct thermal_hwmon_temp *temp;
 911         int new_hwmon_device = 1;
 912         int result;
 913
 914         hwmon = thermal_hwmon_lookup_by_type(tz);
 915         if (hwmon) {
 916                 new_hwmon_device = 0;
 917                 goto register_sys_interface;
 918         }
 919
 920         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 921         if (!hwmon)
 922                 return -ENOMEM;
 923
 924         INIT_LIST_HEAD(&hwmon->tz_list);
 925         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 926         hwmon->device = hwmon_device_register(NULL);
 927         if (IS_ERR(hwmon->device)) {
 928                 result = PTR_ERR(hwmon->device);
 929                 goto free_mem;
 930         }
 931         dev_set_drvdata(hwmon->device, hwmon);
 932         result = device_create_file(hwmon->device, &dev_attr_name);
 933         if (result)
 934                 goto free_mem;
 935
 936  register_sys_interface:
 937         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 938         if (!temp) {
 939                 result = -ENOMEM;
 940                 goto unregister_name;
 941         }
 942
 943         temp->tz = tz;
 944         hwmon->count++;
 945
 946         snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
 947                  "temp%d_input", hwmon->count);
 948         temp->temp_input.attr.attr.name = temp->temp_input.name;
 949         temp->temp_input.attr.attr.mode = 0444;
 950         temp->temp_input.attr.show = temp_input_show;
 951         sysfs_attr_init(&temp->temp_input.attr.attr);
 952         result = device_create_file(hwmon->device, &temp->temp_input.attr);
 953         if (result)
 954                 goto free_temp_mem;
 955
 956         if (tz->ops->get_crit_temp) {
 957                 unsigned long temperature;
 958                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 959                         snprintf(temp->temp_crit.name,
 960                                  sizeof(temp->temp_crit.name),
 961                                 "temp%d_crit", hwmon->count);
 962                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 963                         temp->temp_crit.attr.attr.mode = 0444;
 964                         temp->temp_crit.attr.show = temp_crit_show;
 965                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 966                         result = device_create_file(hwmon->device,
 967                                                     &temp->temp_crit.attr);
 968                         if (result)
 969                                 goto unregister_input;
 970                 }
 971         }
 972
 973         mutex_lock(&thermal_list_lock);
 974         if (new_hwmon_device)
 975                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 976         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 977         mutex_unlock(&thermal_list_lock);
 978
 979         return 0;
 980
 981  unregister_input:
 982         device_remove_file(hwmon->device, &temp->temp_input.attr);
 983  free_temp_mem:
 984         kfree(temp);
 985  unregister_name:
 986         if (new_hwmon_device) {
 987                 device_remove_file(hwmon->device, &dev_attr_name);
 988                 hwmon_device_unregister(hwmon->device);
 989         }
 990  free_mem:
 991         if (new_hwmon_device)
 992                 kfree(hwmon);
 993
 994         return result;
 995 }
 996
 997 static void
 998 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 999 {
1000         struct thermal_hwmon_device *hwmon;
1001         struct thermal_hwmon_temp *temp;
1002
1003         hwmon = thermal_hwmon_lookup_by_type(tz);
1004         if (unlikely(!hwmon)) {
1005                 /* Should never happen... */
1006                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
1007                 return;
1008         }
1009
1010         temp = thermal_hwmon_lookup_temp(hwmon, tz);
1011         if (unlikely(!temp)) {
1012                 /* Should never happen... */
1013                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
1014                 return;
1015         }
1016
1017         device_remove_file(hwmon->device, &temp->temp_input.attr);
1018         if (tz->ops->get_crit_temp)
1019                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
1020
1021         mutex_lock(&thermal_list_lock);
1022         list_del(&temp->hwmon_node);
1023         kfree(temp);
1024         if (!list_empty(&hwmon->tz_list)) {
1025                 mutex_unlock(&thermal_list_lock);
1026                 return;
1027         }
1028         list_del(&hwmon->node);
1029         mutex_unlock(&thermal_list_lock);
1030
1031         device_remove_file(hwmon->device, &dev_attr_name);
1032         hwmon_device_unregister(hwmon->device);
1033         kfree(hwmon);
1034 }
1035 #else
1036 static int
1037 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
1038 {
1039         return 0;
1040 }
1041
1042 static void
1043 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1044 {
1045 }
1046 #endif
1047
1048 /**
1049  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
1050  * @tz:         thermal zone device
1051  * @trip:       indicates which trip point the cooling devices is
1052  *              associated with in this thermal zone.
1053  * @cdev:       thermal cooling device
1054  *
1055  * This function is usually called in the thermal zone device .bind callback.
1056  */
1057 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1058                                      int trip,
1059                                      struct thermal_cooling_device *cdev,
1060                                      unsigned long upper, unsigned long lower)
1061 {
1062         struct thermal_instance *dev;
1063         struct thermal_instance *pos;
1064         struct thermal_zone_device *pos1;
1065         struct thermal_cooling_device *pos2;
1066         unsigned long max_state;
1067         int result;
1068
1069         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1070                 return -EINVAL;
1071
1072         list_for_each_entry(pos1, &thermal_tz_list, node) {
1073                 if (pos1 == tz)
1074                         break;
1075         }
1076         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1077                 if (pos2 == cdev)
1078                         break;
1079         }
1080
1081         if (tz != pos1 || cdev != pos2)
1082                 return -EINVAL;
1083
1084         cdev->ops->get_max_state(cdev, &max_state);
1085
1086         /* lower default 0, upper default max_state */
1087         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1088         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1089
1090         if (lower > upper || upper > max_state)
1091                 return -EINVAL;
1092
1093         dev =
1094             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1095         if (!dev)
1096                 return -ENOMEM;
1097         dev->tz = tz;
1098         dev->cdev = cdev;
1099         dev->trip = trip;
1100         dev->upper = upper;
1101         dev->lower = lower;
1102         dev->target = THERMAL_NO_TARGET;
1103
1104         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1105         if (result)
1106                 goto free_mem;
1107
1108         sprintf(dev->name, "cdev%d", dev->id);
1109         result =
1110             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1111         if (result)
1112                 goto release_idr;
1113
1114         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1115         sysfs_attr_init(&dev->attr.attr);
1116         dev->attr.attr.name = dev->attr_name;
1117         dev->attr.attr.mode = 0444;
1118         dev->attr.show = thermal_cooling_device_trip_point_show;
1119         result = device_create_file(&tz->device, &dev->attr);
1120         if (result)
1121                 goto remove_symbol_link;
1122
1123         mutex_lock(&tz->lock);
1124         mutex_lock(&cdev->lock);
1125         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1126             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1127                 result = -EEXIST;
1128                 break;
1129         }
1130         if (!result) {
1131                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1132                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1133         }
1134         mutex_unlock(&cdev->lock);
1135         mutex_unlock(&tz->lock);
1136
1137         if (!result)
1138                 return 0;
1139
1140         device_remove_file(&tz->device, &dev->attr);
1141 remove_symbol_link:
1142         sysfs_remove_link(&tz->device.kobj, dev->name);
1143 release_idr:
1144         release_idr(&tz->idr, &tz->lock, dev->id);
1145 free_mem:
1146         kfree(dev);
1147         return result;
1148 }
1149 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
1150
1151 /**
1152  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
1153  * @tz:         thermal zone device
1154  * @trip:       indicates which trip point the cooling devices is
1155  *              associated with in this thermal zone.
1156  * @cdev:       thermal cooling device
1157  *
1158  * This function is usually called in the thermal zone device .unbind callback.
1159  */
1160 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1161                                        int trip,
1162                                        struct thermal_cooling_device *cdev)
1163 {
1164         struct thermal_instance *pos, *next;
1165
1166         mutex_lock(&tz->lock);
1167         mutex_lock(&cdev->lock);
1168         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1169                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1170                         list_del(&pos->tz_node);
1171                         list_del(&pos->cdev_node);
1172                         mutex_unlock(&cdev->lock);
1173                         mutex_unlock(&tz->lock);
1174                         goto unbind;
1175                 }
1176         }
1177         mutex_unlock(&cdev->lock);
1178         mutex_unlock(&tz->lock);
1179
1180         return -ENODEV;
1181
1182 unbind:
1183         device_remove_file(&tz->device, &pos->attr);
1184         sysfs_remove_link(&tz->device.kobj, pos->name);
1185         release_idr(&tz->idr, &tz->lock, pos->id);
1186         kfree(pos);
1187         return 0;
1188 }
1189 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
1190
1191 static void thermal_release(struct device *dev)
1192 {
1193         struct thermal_zone_device *tz;
1194         struct thermal_cooling_device *cdev;
1195
1196         if (!strncmp(dev_name(dev), "thermal_zone",
1197                      sizeof("thermal_zone") - 1)) {
1198                 tz = to_thermal_zone(dev);
1199                 kfree(tz);
1200         } else {
1201                 cdev = to_cooling_device(dev);
1202                 kfree(cdev);
1203         }
1204 }
1205
1206 static struct class thermal_class = {
1207         .name = "thermal",
1208         .dev_release = thermal_release,
1209 };
1210
1211 /**
1212  * thermal_cooling_device_register - register a new thermal cooling device
1213  * @type:       the thermal cooling device type.
1214  * @devdata:    device private data.
1215  * @ops:                standard thermal cooling devices callbacks.
1216  */
1217 struct thermal_cooling_device *
1218 thermal_cooling_device_register(char *type, void *devdata,
1219                                 const struct thermal_cooling_device_ops *ops)
1220 {
1221         struct thermal_cooling_device *cdev;
1222         int result;
1223
1224         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1225                 return ERR_PTR(-EINVAL);
1226
1227         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1228             !ops->set_cur_state)
1229                 return ERR_PTR(-EINVAL);
1230
1231         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1232         if (!cdev)
1233                 return ERR_PTR(-ENOMEM);
1234
1235         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1236         if (result) {
1237                 kfree(cdev);
1238                 return ERR_PTR(result);
1239         }
1240
1241         strcpy(cdev->type, type ? : "");
1242         mutex_init(&cdev->lock);
1243         INIT_LIST_HEAD(&cdev->thermal_instances);
1244         cdev->ops = ops;
1245         cdev->updated = true;
1246         cdev->device.class = &thermal_class;
1247         cdev->devdata = devdata;
1248         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1249         result = device_register(&cdev->device);
1250         if (result) {
1251                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1252                 kfree(cdev);
1253                 return ERR_PTR(result);
1254         }
1255
1256         /* sys I/F */
1257         if (type) {
1258                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1259                 if (result)
1260                         goto unregister;
1261         }
1262
1263         result = device_create_file(&cdev->device, &dev_attr_max_state);
1264         if (result)
1265                 goto unregister;
1266
1267         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1268         if (result)
1269                 goto unregister;
1270
1271         /* Add 'this' new cdev to the global cdev list */
1272         mutex_lock(&thermal_list_lock);
1273         list_add(&cdev->node, &thermal_cdev_list);
1274         mutex_unlock(&thermal_list_lock);
1275
1276         /* Update binding information for 'this' new cdev */
1277         bind_cdev(cdev);
1278
1279         return cdev;
1280
1281 unregister:
1282         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1283         device_unregister(&cdev->device);
1284         return ERR_PTR(result);
1285 }
1286 EXPORT_SYMBOL(thermal_cooling_device_register);
1287
1288 /**
1289  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1290  * @cdev:       the thermal cooling device to remove.
1291  *
1292  * thermal_cooling_device_unregister() must be called when the device is no
1293  * longer needed.
1294  */
1295 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1296 {
1297         int i;
1298         const struct thermal_zone_params *tzp;
1299         struct thermal_zone_device *tz;
1300         struct thermal_cooling_device *pos = NULL;
1301
1302         if (!cdev)
1303                 return;
1304
1305         mutex_lock(&thermal_list_lock);
1306         list_for_each_entry(pos, &thermal_cdev_list, node)
1307             if (pos == cdev)
1308                 break;
1309         if (pos != cdev) {
1310                 /* thermal cooling device not found */
1311                 mutex_unlock(&thermal_list_lock);
1312                 return;
1313         }
1314         list_del(&cdev->node);
1315
1316         /* Unbind all thermal zones associated with 'this' cdev */
1317         list_for_each_entry(tz, &thermal_tz_list, node) {
1318                 if (tz->ops->unbind) {
1319                         tz->ops->unbind(tz, cdev);
1320                         continue;
1321                 }
1322
1323                 if (!tz->tzp || !tz->tzp->tbp)
1324                         continue;
1325
1326                 tzp = tz->tzp;
1327                 for (i = 0; i < tzp->num_tbps; i++) {
1328                         if (tzp->tbp[i].cdev == cdev) {
1329                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1330                                 tzp->tbp[i].cdev = NULL;
1331                         }
1332                 }
1333         }
1334
1335         mutex_unlock(&thermal_list_lock);
1336
1337         if (cdev->type[0])
1338                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1339         device_remove_file(&cdev->device, &dev_attr_max_state);
1340         device_remove_file(&cdev->device, &dev_attr_cur_state);
1341
1342         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1343         device_unregister(&cdev->device);
1344         return;
1345 }
1346 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1347
1348 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1349 {
1350         struct thermal_instance *instance;
1351         unsigned long target = 0;
1352
1353         /* cooling device is updated*/
1354         if (cdev->updated)
1355                 return;
1356
1357         mutex_lock(&cdev->lock);
1358         /* Make sure cdev enters the deepest cooling state */
1359         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1360                 if (instance->target == THERMAL_NO_TARGET)
1361                         continue;
1362                 if (instance->target > target)
1363                         target = instance->target;
1364         }
1365         mutex_unlock(&cdev->lock);
1366         cdev->ops->set_cur_state(cdev, target);
1367         cdev->updated = true;
1368 }
1369 EXPORT_SYMBOL(thermal_cdev_update);
1370
1371 /**
1372  * create_trip_attrs - create attributes for trip points
1373  * @tz:         the thermal zone device
1374  * @mask:       Writeable trip point bitmap.
1375  */
1376 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1377 {
1378         int indx;
1379         int size = sizeof(struct thermal_attr) * tz->trips;
1380
1381         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1382         if (!tz->trip_type_attrs)
1383                 return -ENOMEM;
1384
1385         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1386         if (!tz->trip_temp_attrs) {
1387                 kfree(tz->trip_type_attrs);
1388                 return -ENOMEM;
1389         }
1390
1391         if (tz->ops->get_trip_hyst) {
1392                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1393                 if (!tz->trip_hyst_attrs) {
1394                         kfree(tz->trip_type_attrs);
1395                         kfree(tz->trip_temp_attrs);
1396                         return -ENOMEM;
1397                 }
1398         }
1399
1400
1401         for (indx = 0; indx < tz->trips; indx++) {
1402                 /* create trip type attribute */
1403                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1404                          "trip_point_%d_type", indx);
1405
1406                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1407                 tz->trip_type_attrs[indx].attr.attr.name =
1408                                                 tz->trip_type_attrs[indx].name;
1409                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1410                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1411
1412                 device_create_file(&tz->device,
1413                                    &tz->trip_type_attrs[indx].attr);
1414
1415                 /* create trip temp attribute */
1416                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1417                          "trip_point_%d_temp", indx);
1418
1419                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1420                 tz->trip_temp_attrs[indx].attr.attr.name =
1421                                                 tz->trip_temp_attrs[indx].name;
1422                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1423                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1424                 if (mask & (1 << indx)) {
1425                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1426                         tz->trip_temp_attrs[indx].attr.store =
1427                                                         trip_point_temp_store;
1428                 }
1429
1430                 device_create_file(&tz->device,
1431                                    &tz->trip_temp_attrs[indx].attr);
1432
1433                 /* create Optional trip hyst attribute */
1434                 if (!tz->ops->get_trip_hyst)
1435                         continue;
1436                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1437                          "trip_point_%d_hyst", indx);
1438
1439                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1440                 tz->trip_hyst_attrs[indx].attr.attr.name =
1441                                         tz->trip_hyst_attrs[indx].name;
1442                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1443                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1444                 if (tz->ops->set_trip_hyst) {
1445                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1446                         tz->trip_hyst_attrs[indx].attr.store =
1447                                         trip_point_hyst_store;
1448                 }
1449
1450                 device_create_file(&tz->device,
1451                                    &tz->trip_hyst_attrs[indx].attr);
1452         }
1453         return 0;
1454 }
1455
1456 static void remove_trip_attrs(struct thermal_zone_device *tz)
1457 {
1458         int indx;
1459
1460         for (indx = 0; indx < tz->trips; indx++) {
1461                 device_remove_file(&tz->device,
1462                                    &tz->trip_type_attrs[indx].attr);
1463                 device_remove_file(&tz->device,
1464                                    &tz->trip_temp_attrs[indx].attr);
1465                 if (tz->ops->get_trip_hyst)
1466                         device_remove_file(&tz->device,
1467                                   &tz->trip_hyst_attrs[indx].attr);
1468         }
1469         kfree(tz->trip_type_attrs);
1470         kfree(tz->trip_temp_attrs);
1471         kfree(tz->trip_hyst_attrs);
1472 }
1473
1474 /**
1475  * thermal_zone_device_register - register a new thermal zone device
1476  * @type:       the thermal zone device type
1477  * @trips:      the number of trip points the thermal zone support
1478  * @mask:       a bit string indicating the writeablility of trip points
1479  * @devdata:    private device data
1480  * @ops:        standard thermal zone device callbacks
1481  * @tzp:        thermal zone platform parameters
1482  * @passive_delay: number of milliseconds to wait between polls when
1483  *                 performing passive cooling
1484  * @polling_delay: number of milliseconds to wait between polls when checking
1485  *                 whether trip points have been crossed (0 for interrupt
1486  *                 driven systems)
1487  *
1488  * thermal_zone_device_unregister() must be called when the device is no
1489  * longer needed. The passive cooling depends on the .get_trend() return value.
1490  */
1491 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1492         int trips, int mask, void *devdata,
1493         const struct thermal_zone_device_ops *ops,
1494         const struct thermal_zone_params *tzp,
1495         int passive_delay, int polling_delay)
1496 {
1497         struct thermal_zone_device *tz;
1498         enum thermal_trip_type trip_type;
1499         int result;
1500         int count;
1501         int passive = 0;
1502
1503         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1504                 return ERR_PTR(-EINVAL);
1505
1506         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1507                 return ERR_PTR(-EINVAL);
1508
1509         if (!ops || !ops->get_temp)
1510                 return ERR_PTR(-EINVAL);
1511
1512         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1513         if (!tz)
1514                 return ERR_PTR(-ENOMEM);
1515
1516         INIT_LIST_HEAD(&tz->thermal_instances);
1517         idr_init(&tz->idr);
1518         mutex_init(&tz->lock);
1519         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1520         if (result) {
1521                 kfree(tz);
1522                 return ERR_PTR(result);
1523         }
1524
1525         strcpy(tz->type, type ? : "");
1526         tz->ops = ops;
1527         tz->tzp = tzp;
1528         tz->device.class = &thermal_class;
1529         tz->devdata = devdata;
1530         tz->trips = trips;
1531         tz->passive_delay = passive_delay;
1532         tz->polling_delay = polling_delay;
1533
1534         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1535         result = device_register(&tz->device);
1536         if (result) {
1537                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1538                 kfree(tz);
1539                 return ERR_PTR(result);
1540         }
1541
1542         /* sys I/F */
1543         if (type) {
1544                 result = device_create_file(&tz->device, &dev_attr_type);
1545                 if (result)
1546                         goto unregister;
1547         }
1548
1549         result = device_create_file(&tz->device, &dev_attr_temp);
1550         if (result)
1551                 goto unregister;
1552
1553         if (ops->get_mode) {
1554                 result = device_create_file(&tz->device, &dev_attr_mode);
1555                 if (result)
1556                         goto unregister;
1557         }
1558
1559         result = create_trip_attrs(tz, mask);
1560         if (result)
1561                 goto unregister;
1562
1563         for (count = 0; count < trips; count++) {
1564                 tz->ops->get_trip_type(tz, count, &trip_type);
1565                 if (trip_type == THERMAL_TRIP_PASSIVE)
1566                         passive = 1;
1567         }
1568
1569         if (!passive) {
1570                 result = device_create_file(&tz->device, &dev_attr_passive);
1571                 if (result)
1572                         goto unregister;
1573         }
1574
1575         /* Create policy attribute */
1576         result = device_create_file(&tz->device, &dev_attr_policy);
1577         if (result)
1578                 goto unregister;
1579
1580         /* Update 'this' zone's governor information */
1581         mutex_lock(&thermal_governor_lock);
1582
1583         if (tz->tzp)
1584                 tz->governor = __find_governor(tz->tzp->governor_name);
1585         else
1586                 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1587
1588         mutex_unlock(&thermal_governor_lock);
1589
1590         result = thermal_add_hwmon_sysfs(tz);
1591         if (result)
1592                 goto unregister;
1593
1594         mutex_lock(&thermal_list_lock);
1595         list_add_tail(&tz->node, &thermal_tz_list);
1596         mutex_unlock(&thermal_list_lock);
1597
1598         /* Bind cooling devices for this zone */
1599         bind_tz(tz);
1600
1601         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1602
1603         thermal_zone_device_update(tz);
1604
1605         if (!result)
1606                 return tz;
1607
1608 unregister:
1609         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1610         device_unregister(&tz->device);
1611         return ERR_PTR(result);
1612 }
1613 EXPORT_SYMBOL(thermal_zone_device_register);
1614
1615 /**
1616  * thermal_device_unregister - removes the registered thermal zone device
1617  * @tz: the thermal zone device to remove
1618  */
1619 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1620 {
1621         int i;
1622         const struct thermal_zone_params *tzp;
1623         struct thermal_cooling_device *cdev;
1624         struct thermal_zone_device *pos = NULL;
1625
1626         if (!tz)
1627                 return;
1628
1629         tzp = tz->tzp;
1630
1631         mutex_lock(&thermal_list_lock);
1632         list_for_each_entry(pos, &thermal_tz_list, node)
1633             if (pos == tz)
1634                 break;
1635         if (pos != tz) {
1636                 /* thermal zone device not found */
1637                 mutex_unlock(&thermal_list_lock);
1638                 return;
1639         }
1640         list_del(&tz->node);
1641
1642         /* Unbind all cdevs associated with 'this' thermal zone */
1643         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1644                 if (tz->ops->unbind) {
1645                         tz->ops->unbind(tz, cdev);
1646                         continue;
1647                 }
1648
1649                 if (!tzp || !tzp->tbp)
1650                         break;
1651
1652                 for (i = 0; i < tzp->num_tbps; i++) {
1653                         if (tzp->tbp[i].cdev == cdev) {
1654                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1655                                 tzp->tbp[i].cdev = NULL;
1656                         }
1657                 }
1658         }
1659
1660         mutex_unlock(&thermal_list_lock);
1661
1662         thermal_zone_device_set_polling(tz, 0);
1663
1664         if (tz->type[0])
1665                 device_remove_file(&tz->device, &dev_attr_type);
1666         device_remove_file(&tz->device, &dev_attr_temp);
1667         if (tz->ops->get_mode)
1668                 device_remove_file(&tz->device, &dev_attr_mode);
1669         device_remove_file(&tz->device, &dev_attr_policy);
1670         remove_trip_attrs(tz);
1671         tz->governor = NULL;
1672
1673         thermal_remove_hwmon_sysfs(tz);
1674         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1675         idr_destroy(&tz->idr);
1676         mutex_destroy(&tz->lock);
1677         device_unregister(&tz->device);
1678         return;
1679 }
1680 EXPORT_SYMBOL(thermal_zone_device_unregister);
1681
1682 #ifdef CONFIG_NET
1683 static struct genl_family thermal_event_genl_family = {
1684         .id = GENL_ID_GENERATE,
1685         .name = THERMAL_GENL_FAMILY_NAME,
1686         .version = THERMAL_GENL_VERSION,
1687         .maxattr = THERMAL_GENL_ATTR_MAX,
1688 };
1689
1690 static struct genl_multicast_group thermal_event_mcgrp = {
1691         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1692 };
1693
1694 int thermal_generate_netlink_event(u32 orig, enum events event)
1695 {
1696         struct sk_buff *skb;
1697         struct nlattr *attr;
1698         struct thermal_genl_event *thermal_event;
1699         void *msg_header;
1700         int size;
1701         int result;
1702         static unsigned int thermal_event_seqnum;
1703
1704         /* allocate memory */
1705         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1706                nla_total_size(0);
1707
1708         skb = genlmsg_new(size, GFP_ATOMIC);
1709         if (!skb)
1710                 return -ENOMEM;
1711
1712         /* add the genetlink message header */
1713         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1714                                  &thermal_event_genl_family, 0,
1715                                  THERMAL_GENL_CMD_EVENT);
1716         if (!msg_header) {
1717                 nlmsg_free(skb);
1718                 return -ENOMEM;
1719         }
1720
1721         /* fill the data */
1722         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1723                            sizeof(struct thermal_genl_event));
1724
1725         if (!attr) {
1726                 nlmsg_free(skb);
1727                 return -EINVAL;
1728         }
1729
1730         thermal_event = nla_data(attr);
1731         if (!thermal_event) {
1732                 nlmsg_free(skb);
1733                 return -EINVAL;
1734         }
1735
1736         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1737
1738         thermal_event->orig = orig;
1739         thermal_event->event = event;
1740
1741         /* send multicast genetlink message */
1742         result = genlmsg_end(skb, msg_header);
1743         if (result < 0) {
1744                 nlmsg_free(skb);
1745                 return result;
1746         }
1747
1748         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1749         if (result)
1750                 pr_info("failed to send netlink event:%d\n", result);
1751
1752         return result;
1753 }
1754 EXPORT_SYMBOL(thermal_generate_netlink_event);
1755
1756 static int genetlink_init(void)
1757 {
1758         int result;
1759
1760         result = genl_register_family(&thermal_event_genl_family);
1761         if (result)
1762                 return result;
1763
1764         result = genl_register_mc_group(&thermal_event_genl_family,
1765                                         &thermal_event_mcgrp);
1766         if (result)
1767                 genl_unregister_family(&thermal_event_genl_family);
1768         return result;
1769 }
1770
1771 static void genetlink_exit(void)
1772 {
1773         genl_unregister_family(&thermal_event_genl_family);
1774 }
1775 #else /* !CONFIG_NET */
1776 static inline int genetlink_init(void) { return 0; }
1777 static inline void genetlink_exit(void) {}
1778 #endif /* !CONFIG_NET */
1779
1780 static int __init thermal_init(void)
1781 {
1782         int result = 0;
1783
1784         result = class_register(&thermal_class);
1785         if (result) {
1786                 idr_destroy(&thermal_tz_idr);
1787                 idr_destroy(&thermal_cdev_idr);
1788                 mutex_destroy(&thermal_idr_lock);
1789                 mutex_destroy(&thermal_list_lock);
1790         }
1791         result = genetlink_init();
1792         return result;
1793 }
1794
1795 static void __exit thermal_exit(void)
1796 {
1797         class_unregister(&thermal_class);
1798         idr_destroy(&thermal_tz_idr);
1799         idr_destroy(&thermal_cdev_idr);
1800         mutex_destroy(&thermal_idr_lock);
1801         mutex_destroy(&thermal_list_lock);
1802         genetlink_exit();
1803 }
1804
1805 fs_initcall(thermal_init);
1806 module_exit(thermal_exit);