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 || !tzp->tbp)
 256                         continue;
 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 || !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         if (tz->governor)
 340                 tz->governor->throttle(tz, trip);
 341 }
 342
 343 static void handle_critical_trips(struct thermal_zone_device *tz,
 344                                 int trip, enum thermal_trip_type trip_type)
 345 {
 346         long trip_temp;
 347
 348         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 349
 350         /* If we have not crossed the trip_temp, we do not care. */
 351         if (tz->temperature < trip_temp)
 352                 return;
 353
 354         if (tz->ops->notify)
 355                 tz->ops->notify(tz, trip, trip_type);
 356
 357         if (trip_type == THERMAL_TRIP_CRITICAL) {
 358                 pr_emerg("Critical temperature reached(%d C),shutting down\n",
 359                          tz->temperature / 1000);
 360                 orderly_poweroff(true);
 361         }
 362 }
 363
 364 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 365 {
 366         enum thermal_trip_type type;
 367
 368         tz->ops->get_trip_type(tz, trip, &type);
 369
 370         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 371                 handle_critical_trips(tz, trip, type);
 372         else
 373                 handle_non_critical_trips(tz, trip, type);
 374         /*
 375          * Alright, we handled this trip successfully.
 376          * So, start monitoring again.
 377          */
 378         monitor_thermal_zone(tz);
 379 }
 380
 381 static void update_temperature(struct thermal_zone_device *tz)
 382 {
 383         long temp;
 384         int ret;
 385
 386         mutex_lock(&tz->lock);
 387
 388         ret = tz->ops->get_temp(tz, &temp);
 389         if (ret) {
 390                 pr_warn("failed to read out thermal zone %d\n", tz->id);
 391                 goto exit;
 392         }
 393
 394         tz->last_temperature = tz->temperature;
 395         tz->temperature = temp;
 396
 397 exit:
 398         mutex_unlock(&tz->lock);
 399 }
 400
 401 void thermal_zone_device_update(struct thermal_zone_device *tz)
 402 {
 403         int count;
 404
 405         update_temperature(tz);
 406
 407         for (count = 0; count < tz->trips; count++)
 408                 handle_thermal_trip(tz, count);
 409 }
 410 EXPORT_SYMBOL(thermal_zone_device_update);
 411
 412 static void thermal_zone_device_check(struct work_struct *work)
 413 {
 414         struct thermal_zone_device *tz = container_of(work, struct
 415                                                       thermal_zone_device,
 416                                                       poll_queue.work);
 417         thermal_zone_device_update(tz);
 418 }
 419
 420 /* sys I/F for thermal zone */
 421
 422 #define to_thermal_zone(_dev) \
 423         container_of(_dev, struct thermal_zone_device, device)
 424
 425 static ssize_t
 426 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 427 {
 428         struct thermal_zone_device *tz = to_thermal_zone(dev);
 429
 430         return sprintf(buf, "%s\n", tz->type);
 431 }
 432
 433 static ssize_t
 434 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 435 {
 436         struct thermal_zone_device *tz = to_thermal_zone(dev);
 437         long temperature;
 438         int ret;
 439
 440         if (!tz->ops->get_temp)
 441                 return -EPERM;
 442
 443         ret = tz->ops->get_temp(tz, &temperature);
 444
 445         if (ret)
 446                 return ret;
 447
 448         return sprintf(buf, "%ld\n", temperature);
 449 }
 450
 451 static ssize_t
 452 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 453 {
 454         struct thermal_zone_device *tz = to_thermal_zone(dev);
 455         enum thermal_device_mode mode;
 456         int result;
 457
 458         if (!tz->ops->get_mode)
 459                 return -EPERM;
 460
 461         result = tz->ops->get_mode(tz, &mode);
 462         if (result)
 463                 return result;
 464
 465         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 466                        : "disabled");
 467 }
 468
 469 static ssize_t
 470 mode_store(struct device *dev, struct device_attribute *attr,
 471            const char *buf, size_t count)
 472 {
 473         struct thermal_zone_device *tz = to_thermal_zone(dev);
 474         int result;
 475
 476         if (!tz->ops->set_mode)
 477                 return -EPERM;
 478
 479         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 480                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 481         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 482                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 483         else
 484                 result = -EINVAL;
 485
 486         if (result)
 487                 return result;
 488
 489         return count;
 490 }
 491
 492 static ssize_t
 493 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 494                      char *buf)
 495 {
 496         struct thermal_zone_device *tz = to_thermal_zone(dev);
 497         enum thermal_trip_type type;
 498         int trip, result;
 499
 500         if (!tz->ops->get_trip_type)
 501                 return -EPERM;
 502
 503         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 504                 return -EINVAL;
 505
 506         result = tz->ops->get_trip_type(tz, trip, &type);
 507         if (result)
 508                 return result;
 509
 510         switch (type) {
 511         case THERMAL_TRIP_CRITICAL:
 512                 return sprintf(buf, "critical\n");
 513         case THERMAL_TRIP_HOT:
 514                 return sprintf(buf, "hot\n");
 515         case THERMAL_TRIP_PASSIVE:
 516                 return sprintf(buf, "passive\n");
 517         case THERMAL_TRIP_ACTIVE:
 518                 return sprintf(buf, "active\n");
 519         default:
 520                 return sprintf(buf, "unknown\n");
 521         }
 522 }
 523
 524 static ssize_t
 525 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 526                      const char *buf, size_t count)
 527 {
 528         struct thermal_zone_device *tz = to_thermal_zone(dev);
 529         int trip, ret;
 530         unsigned long temperature;
 531
 532         if (!tz->ops->set_trip_temp)
 533                 return -EPERM;
 534
 535         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 536                 return -EINVAL;
 537
 538         if (kstrtoul(buf, 10, &temperature))
 539                 return -EINVAL;
 540
 541         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 542
 543         return ret ? ret : count;
 544 }
 545
 546 static ssize_t
 547 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 548                      char *buf)
 549 {
 550         struct thermal_zone_device *tz = to_thermal_zone(dev);
 551         int trip, ret;
 552         long temperature;
 553
 554         if (!tz->ops->get_trip_temp)
 555                 return -EPERM;
 556
 557         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 558                 return -EINVAL;
 559
 560         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 561
 562         if (ret)
 563                 return ret;
 564
 565         return sprintf(buf, "%ld\n", temperature);
 566 }
 567
 568 static ssize_t
 569 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 570                         const char *buf, size_t count)
 571 {
 572         struct thermal_zone_device *tz = to_thermal_zone(dev);
 573         int trip, ret;
 574         unsigned long temperature;
 575
 576         if (!tz->ops->set_trip_hyst)
 577                 return -EPERM;
 578
 579         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 580                 return -EINVAL;
 581
 582         if (kstrtoul(buf, 10, &temperature))
 583                 return -EINVAL;
 584
 585         /*
 586          * We are not doing any check on the 'temperature' value
 587          * here. The driver implementing 'set_trip_hyst' has to
 588          * take care of this.
 589          */
 590         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 591
 592         return ret ? ret : count;
 593 }
 594
 595 static ssize_t
 596 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 597                         char *buf)
 598 {
 599         struct thermal_zone_device *tz = to_thermal_zone(dev);
 600         int trip, ret;
 601         unsigned long temperature;
 602
 603         if (!tz->ops->get_trip_hyst)
 604                 return -EPERM;
 605
 606         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 607                 return -EINVAL;
 608
 609         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 610
 611         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 612 }
 613
 614 static ssize_t
 615 passive_store(struct device *dev, struct device_attribute *attr,
 616                     const char *buf, size_t count)
 617 {
 618         struct thermal_zone_device *tz = to_thermal_zone(dev);
 619         struct thermal_cooling_device *cdev = NULL;
 620         int state;
 621
 622         if (!sscanf(buf, "%d\n", &state))
 623                 return -EINVAL;
 624
 625         /* sanity check: values below 1000 millicelcius don't make sense
 626          * and can cause the system to go into a thermal heart attack
 627          */
 628         if (state && state < 1000)
 629                 return -EINVAL;
 630
 631         if (state && !tz->forced_passive) {
 632                 mutex_lock(&thermal_list_lock);
 633                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 634                         if (!strncmp("Processor", cdev->type,
 635                                      sizeof("Processor")))
 636                                 thermal_zone_bind_cooling_device(tz,
 637                                                 THERMAL_TRIPS_NONE, cdev,
 638                                                 THERMAL_NO_LIMIT,
 639                                                 THERMAL_NO_LIMIT);
 640                 }
 641                 mutex_unlock(&thermal_list_lock);
 642                 if (!tz->passive_delay)
 643                         tz->passive_delay = 1000;
 644         } else if (!state && tz->forced_passive) {
 645                 mutex_lock(&thermal_list_lock);
 646                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 647                         if (!strncmp("Processor", cdev->type,
 648                                      sizeof("Processor")))
 649                                 thermal_zone_unbind_cooling_device(tz,
 650                                                                    THERMAL_TRIPS_NONE,
 651                                                                    cdev);
 652                 }
 653                 mutex_unlock(&thermal_list_lock);
 654                 tz->passive_delay = 0;
 655         }
 656
 657         tz->forced_passive = state;
 658
 659         thermal_zone_device_update(tz);
 660
 661         return count;
 662 }
 663
 664 static ssize_t
 665 passive_show(struct device *dev, struct device_attribute *attr,
 666                    char *buf)
 667 {
 668         struct thermal_zone_device *tz = to_thermal_zone(dev);
 669
 670         return sprintf(buf, "%d\n", tz->forced_passive);
 671 }
 672
 673 static ssize_t
 674 policy_store(struct device *dev, struct device_attribute *attr,
 675                     const char *buf, size_t count)
 676 {
 677         int ret = -EINVAL;
 678         struct thermal_zone_device *tz = to_thermal_zone(dev);
 679         struct thermal_governor *gov;
 680
 681         mutex_lock(&thermal_governor_lock);
 682
 683         gov = __find_governor(buf);
 684         if (!gov)
 685                 goto exit;
 686
 687         tz->governor = gov;
 688         ret = count;
 689
 690 exit:
 691         mutex_unlock(&thermal_governor_lock);
 692         return ret;
 693 }
 694
 695 static ssize_t
 696 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 697 {
 698         struct thermal_zone_device *tz = to_thermal_zone(dev);
 699
 700         return sprintf(buf, "%s\n", tz->governor->name);
 701 }
 702
 703 static DEVICE_ATTR(type, 0444, type_show, NULL);
 704 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 705 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 706 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 707 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 708
 709 /* sys I/F for cooling device */
 710 #define to_cooling_device(_dev) \
 711         container_of(_dev, struct thermal_cooling_device, device)
 712
 713 static ssize_t
 714 thermal_cooling_device_type_show(struct device *dev,
 715                                  struct device_attribute *attr, char *buf)
 716 {
 717         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 718
 719         return sprintf(buf, "%s\n", cdev->type);
 720 }
 721
 722 static ssize_t
 723 thermal_cooling_device_max_state_show(struct device *dev,
 724                                       struct device_attribute *attr, char *buf)
 725 {
 726         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 727         unsigned long state;
 728         int ret;
 729
 730         ret = cdev->ops->get_max_state(cdev, &state);
 731         if (ret)
 732                 return ret;
 733         return sprintf(buf, "%ld\n", state);
 734 }
 735
 736 static ssize_t
 737 thermal_cooling_device_cur_state_show(struct device *dev,
 738                                       struct device_attribute *attr, char *buf)
 739 {
 740         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 741         unsigned long state;
 742         int ret;
 743
 744         ret = cdev->ops->get_cur_state(cdev, &state);
 745         if (ret)
 746                 return ret;
 747         return sprintf(buf, "%ld\n", state);
 748 }
 749
 750 static ssize_t
 751 thermal_cooling_device_cur_state_store(struct device *dev,
 752                                        struct device_attribute *attr,
 753                                        const char *buf, size_t count)
 754 {
 755         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 756         unsigned long state;
 757         int result;
 758
 759         if (!sscanf(buf, "%ld\n", &state))
 760                 return -EINVAL;
 761
 762         if ((long)state < 0)
 763                 return -EINVAL;
 764
 765         result = cdev->ops->set_cur_state(cdev, state);
 766         if (result)
 767                 return result;
 768         return count;
 769 }
 770
 771 static struct device_attribute dev_attr_cdev_type =
 772 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 773 static DEVICE_ATTR(max_state, 0444,
 774                    thermal_cooling_device_max_state_show, NULL);
 775 static DEVICE_ATTR(cur_state, 0644,
 776                    thermal_cooling_device_cur_state_show,
 777                    thermal_cooling_device_cur_state_store);
 778
 779 static ssize_t
 780 thermal_cooling_device_trip_point_show(struct device *dev,
 781                                        struct device_attribute *attr, char *buf)
 782 {
 783         struct thermal_instance *instance;
 784
 785         instance =
 786             container_of(attr, struct thermal_instance, attr);
 787
 788         if (instance->trip == THERMAL_TRIPS_NONE)
 789                 return sprintf(buf, "-1\n");
 790         else
 791                 return sprintf(buf, "%d\n", instance->trip);
 792 }
 793
 794 /* Device management */
 795
 796 #if defined(CONFIG_THERMAL_HWMON)
 797
 798 /* hwmon sys I/F */
 799 #include <linux/hwmon.h>
 800
 801 /* thermal zone devices with the same type share one hwmon device */
 802 struct thermal_hwmon_device {
 803         char type[THERMAL_NAME_LENGTH];
 804         struct device *device;
 805         int count;
 806         struct list_head tz_list;
 807         struct list_head node;
 808 };
 809
 810 struct thermal_hwmon_attr {
 811         struct device_attribute attr;
 812         char name[16];
 813 };
 814
 815 /* one temperature input for each thermal zone */
 816 struct thermal_hwmon_temp {
 817         struct list_head hwmon_node;
 818         struct thermal_zone_device *tz;
 819         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 820         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 821 };
 822
 823 static LIST_HEAD(thermal_hwmon_list);
 824
 825 static ssize_t
 826 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 827 {
 828         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 829         return sprintf(buf, "%s\n", hwmon->type);
 830 }
 831 static DEVICE_ATTR(name, 0444, name_show, NULL);
 832
 833 static ssize_t
 834 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 835 {
 836         long temperature;
 837         int ret;
 838         struct thermal_hwmon_attr *hwmon_attr
 839                         = container_of(attr, struct thermal_hwmon_attr, attr);
 840         struct thermal_hwmon_temp *temp
 841                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 842                                        temp_input);
 843         struct thermal_zone_device *tz = temp->tz;
 844
 845         ret = tz->ops->get_temp(tz, &temperature);
 846
 847         if (ret)
 848                 return ret;
 849
 850         return sprintf(buf, "%ld\n", temperature);
 851 }
 852
 853 static ssize_t
 854 temp_crit_show(struct device *dev, struct device_attribute *attr,
 855                 char *buf)
 856 {
 857         struct thermal_hwmon_attr *hwmon_attr
 858                         = container_of(attr, struct thermal_hwmon_attr, attr);
 859         struct thermal_hwmon_temp *temp
 860                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 861                                        temp_crit);
 862         struct thermal_zone_device *tz = temp->tz;
 863         long temperature;
 864         int ret;
 865
 866         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 867         if (ret)
 868                 return ret;
 869
 870         return sprintf(buf, "%ld\n", temperature);
 871 }
 872
 873
 874 static struct thermal_hwmon_device *
 875 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 876 {
 877         struct thermal_hwmon_device *hwmon;
 878
 879         mutex_lock(&thermal_list_lock);
 880         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 881                 if (!strcmp(hwmon->type, tz->type)) {
 882                         mutex_unlock(&thermal_list_lock);
 883                         return hwmon;
 884                 }
 885         mutex_unlock(&thermal_list_lock);
 886
 887         return NULL;
 888 }
 889
 890 /* Find the temperature input matching a given thermal zone */
 891 static struct thermal_hwmon_temp *
 892 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 893                           const struct thermal_zone_device *tz)
 894 {
 895         struct thermal_hwmon_temp *temp;
 896
 897         mutex_lock(&thermal_list_lock);
 898         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 899                 if (temp->tz == tz) {
 900                         mutex_unlock(&thermal_list_lock);
 901                         return temp;
 902                 }
 903         mutex_unlock(&thermal_list_lock);
 904
 905         return NULL;
 906 }
 907
 908 static int
 909 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 910 {
 911         struct thermal_hwmon_device *hwmon;
 912         struct thermal_hwmon_temp *temp;
 913         int new_hwmon_device = 1;
 914         int result;
 915
 916         hwmon = thermal_hwmon_lookup_by_type(tz);
 917         if (hwmon) {
 918                 new_hwmon_device = 0;
 919                 goto register_sys_interface;
 920         }
 921
 922         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 923         if (!hwmon)
 924                 return -ENOMEM;
 925
 926         INIT_LIST_HEAD(&hwmon->tz_list);
 927         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 928         hwmon->device = hwmon_device_register(NULL);
 929         if (IS_ERR(hwmon->device)) {
 930                 result = PTR_ERR(hwmon->device);
 931                 goto free_mem;
 932         }
 933         dev_set_drvdata(hwmon->device, hwmon);
 934         result = device_create_file(hwmon->device, &dev_attr_name);
 935         if (result)
 936                 goto free_mem;
 937
 938  register_sys_interface:
 939         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 940         if (!temp) {
 941                 result = -ENOMEM;
 942                 goto unregister_name;
 943         }
 944
 945         temp->tz = tz;
 946         hwmon->count++;
 947
 948         snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
 949                  "temp%d_input", hwmon->count);
 950         temp->temp_input.attr.attr.name = temp->temp_input.name;
 951         temp->temp_input.attr.attr.mode = 0444;
 952         temp->temp_input.attr.show = temp_input_show;
 953         sysfs_attr_init(&temp->temp_input.attr.attr);
 954         result = device_create_file(hwmon->device, &temp->temp_input.attr);
 955         if (result)
 956                 goto free_temp_mem;
 957
 958         if (tz->ops->get_crit_temp) {
 959                 unsigned long temperature;
 960                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 961                         snprintf(temp->temp_crit.name,
 962                                  sizeof(temp->temp_crit.name),
 963                                 "temp%d_crit", hwmon->count);
 964                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 965                         temp->temp_crit.attr.attr.mode = 0444;
 966                         temp->temp_crit.attr.show = temp_crit_show;
 967                         sysfs_attr_init(&temp->temp_crit.attr.attr);
 968                         result = device_create_file(hwmon->device,
 969                                                     &temp->temp_crit.attr);
 970                         if (result)
 971                                 goto unregister_input;
 972                 }
 973         }
 974
 975         mutex_lock(&thermal_list_lock);
 976         if (new_hwmon_device)
 977                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 978         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
 979         mutex_unlock(&thermal_list_lock);
 980
 981         return 0;
 982
 983  unregister_input:
 984         device_remove_file(hwmon->device, &temp->temp_input.attr);
 985  free_temp_mem:
 986         kfree(temp);
 987  unregister_name:
 988         if (new_hwmon_device) {
 989                 device_remove_file(hwmon->device, &dev_attr_name);
 990                 hwmon_device_unregister(hwmon->device);
 991         }
 992  free_mem:
 993         if (new_hwmon_device)
 994                 kfree(hwmon);
 995
 996         return result;
 997 }
 998
 999 static void
1000 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1001 {
1002         struct thermal_hwmon_device *hwmon;
1003         struct thermal_hwmon_temp *temp;
1004
1005         hwmon = thermal_hwmon_lookup_by_type(tz);
1006         if (unlikely(!hwmon)) {
1007                 /* Should never happen... */
1008                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
1009                 return;
1010         }
1011
1012         temp = thermal_hwmon_lookup_temp(hwmon, tz);
1013         if (unlikely(!temp)) {
1014                 /* Should never happen... */
1015                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
1016                 return;
1017         }
1018
1019         device_remove_file(hwmon->device, &temp->temp_input.attr);
1020         if (tz->ops->get_crit_temp)
1021                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
1022
1023         mutex_lock(&thermal_list_lock);
1024         list_del(&temp->hwmon_node);
1025         kfree(temp);
1026         if (!list_empty(&hwmon->tz_list)) {
1027                 mutex_unlock(&thermal_list_lock);
1028                 return;
1029         }
1030         list_del(&hwmon->node);
1031         mutex_unlock(&thermal_list_lock);
1032
1033         device_remove_file(hwmon->device, &dev_attr_name);
1034         hwmon_device_unregister(hwmon->device);
1035         kfree(hwmon);
1036 }
1037 #else
1038 static int
1039 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
1040 {
1041         return 0;
1042 }
1043
1044 static void
1045 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1046 {
1047 }
1048 #endif
1049
1050 /**
1051  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
1052  * @tz:         thermal zone device
1053  * @trip:       indicates which trip point the cooling devices is
1054  *              associated with in this thermal zone.
1055  * @cdev:       thermal cooling device
1056  *
1057  * This function is usually called in the thermal zone device .bind callback.
1058  */
1059 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1060                                      int trip,
1061                                      struct thermal_cooling_device *cdev,
1062                                      unsigned long upper, unsigned long lower)
1063 {
1064         struct thermal_instance *dev;
1065         struct thermal_instance *pos;
1066         struct thermal_zone_device *pos1;
1067         struct thermal_cooling_device *pos2;
1068         unsigned long max_state;
1069         int result;
1070
1071         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1072                 return -EINVAL;
1073
1074         list_for_each_entry(pos1, &thermal_tz_list, node) {
1075                 if (pos1 == tz)
1076                         break;
1077         }
1078         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1079                 if (pos2 == cdev)
1080                         break;
1081         }
1082
1083         if (tz != pos1 || cdev != pos2)
1084                 return -EINVAL;
1085
1086         cdev->ops->get_max_state(cdev, &max_state);
1087
1088         /* lower default 0, upper default max_state */
1089         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1090         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1091
1092         if (lower > upper || upper > max_state)
1093                 return -EINVAL;
1094
1095         dev =
1096             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1097         if (!dev)
1098                 return -ENOMEM;
1099         dev->tz = tz;
1100         dev->cdev = cdev;
1101         dev->trip = trip;
1102         dev->upper = upper;
1103         dev->lower = lower;
1104         dev->target = THERMAL_NO_TARGET;
1105
1106         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1107         if (result)
1108                 goto free_mem;
1109
1110         sprintf(dev->name, "cdev%d", dev->id);
1111         result =
1112             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1113         if (result)
1114                 goto release_idr;
1115
1116         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1117         sysfs_attr_init(&dev->attr.attr);
1118         dev->attr.attr.name = dev->attr_name;
1119         dev->attr.attr.mode = 0444;
1120         dev->attr.show = thermal_cooling_device_trip_point_show;
1121         result = device_create_file(&tz->device, &dev->attr);
1122         if (result)
1123                 goto remove_symbol_link;
1124
1125         mutex_lock(&tz->lock);
1126         mutex_lock(&cdev->lock);
1127         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1128             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1129                 result = -EEXIST;
1130                 break;
1131         }
1132         if (!result) {
1133                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1134                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1135         }
1136         mutex_unlock(&cdev->lock);
1137         mutex_unlock(&tz->lock);
1138
1139         if (!result)
1140                 return 0;
1141
1142         device_remove_file(&tz->device, &dev->attr);
1143 remove_symbol_link:
1144         sysfs_remove_link(&tz->device.kobj, dev->name);
1145 release_idr:
1146         release_idr(&tz->idr, &tz->lock, dev->id);
1147 free_mem:
1148         kfree(dev);
1149         return result;
1150 }
1151 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
1152
1153 /**
1154  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
1155  * @tz:         thermal zone device
1156  * @trip:       indicates which trip point the cooling devices is
1157  *              associated with in this thermal zone.
1158  * @cdev:       thermal cooling device
1159  *
1160  * This function is usually called in the thermal zone device .unbind callback.
1161  */
1162 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1163                                        int trip,
1164                                        struct thermal_cooling_device *cdev)
1165 {
1166         struct thermal_instance *pos, *next;
1167
1168         mutex_lock(&tz->lock);
1169         mutex_lock(&cdev->lock);
1170         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1171                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1172                         list_del(&pos->tz_node);
1173                         list_del(&pos->cdev_node);
1174                         mutex_unlock(&cdev->lock);
1175                         mutex_unlock(&tz->lock);
1176                         goto unbind;
1177                 }
1178         }
1179         mutex_unlock(&cdev->lock);
1180         mutex_unlock(&tz->lock);
1181
1182         return -ENODEV;
1183
1184 unbind:
1185         device_remove_file(&tz->device, &pos->attr);
1186         sysfs_remove_link(&tz->device.kobj, pos->name);
1187         release_idr(&tz->idr, &tz->lock, pos->id);
1188         kfree(pos);
1189         return 0;
1190 }
1191 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
1192
1193 static void thermal_release(struct device *dev)
1194 {
1195         struct thermal_zone_device *tz;
1196         struct thermal_cooling_device *cdev;
1197
1198         if (!strncmp(dev_name(dev), "thermal_zone",
1199                      sizeof("thermal_zone") - 1)) {
1200                 tz = to_thermal_zone(dev);
1201                 kfree(tz);
1202         } else {
1203                 cdev = to_cooling_device(dev);
1204                 kfree(cdev);
1205         }
1206 }
1207
1208 static struct class thermal_class = {
1209         .name = "thermal",
1210         .dev_release = thermal_release,
1211 };
1212
1213 /**
1214  * thermal_cooling_device_register - register a new thermal cooling device
1215  * @type:       the thermal cooling device type.
1216  * @devdata:    device private data.
1217  * @ops:                standard thermal cooling devices callbacks.
1218  */
1219 struct thermal_cooling_device *
1220 thermal_cooling_device_register(char *type, void *devdata,
1221                                 const struct thermal_cooling_device_ops *ops)
1222 {
1223         struct thermal_cooling_device *cdev;
1224         int result;
1225
1226         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1227                 return ERR_PTR(-EINVAL);
1228
1229         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1230             !ops->set_cur_state)
1231                 return ERR_PTR(-EINVAL);
1232
1233         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1234         if (!cdev)
1235                 return ERR_PTR(-ENOMEM);
1236
1237         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1238         if (result) {
1239                 kfree(cdev);
1240                 return ERR_PTR(result);
1241         }
1242
1243         strcpy(cdev->type, type ? : "");
1244         mutex_init(&cdev->lock);
1245         INIT_LIST_HEAD(&cdev->thermal_instances);
1246         cdev->ops = ops;
1247         cdev->updated = true;
1248         cdev->device.class = &thermal_class;
1249         cdev->devdata = devdata;
1250         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1251         result = device_register(&cdev->device);
1252         if (result) {
1253                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1254                 kfree(cdev);
1255                 return ERR_PTR(result);
1256         }
1257
1258         /* sys I/F */
1259         if (type) {
1260                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1261                 if (result)
1262                         goto unregister;
1263         }
1264
1265         result = device_create_file(&cdev->device, &dev_attr_max_state);
1266         if (result)
1267                 goto unregister;
1268
1269         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1270         if (result)
1271                 goto unregister;
1272
1273         /* Add 'this' new cdev to the global cdev list */
1274         mutex_lock(&thermal_list_lock);
1275         list_add(&cdev->node, &thermal_cdev_list);
1276         mutex_unlock(&thermal_list_lock);
1277
1278         /* Update binding information for 'this' new cdev */
1279         bind_cdev(cdev);
1280
1281         return cdev;
1282
1283 unregister:
1284         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1285         device_unregister(&cdev->device);
1286         return ERR_PTR(result);
1287 }
1288 EXPORT_SYMBOL(thermal_cooling_device_register);
1289
1290 /**
1291  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1292  * @cdev:       the thermal cooling device to remove.
1293  *
1294  * thermal_cooling_device_unregister() must be called when the device is no
1295  * longer needed.
1296  */
1297 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1298 {
1299         int i;
1300         const struct thermal_zone_params *tzp;
1301         struct thermal_zone_device *tz;
1302         struct thermal_cooling_device *pos = NULL;
1303
1304         if (!cdev)
1305                 return;
1306
1307         mutex_lock(&thermal_list_lock);
1308         list_for_each_entry(pos, &thermal_cdev_list, node)
1309             if (pos == cdev)
1310                 break;
1311         if (pos != cdev) {
1312                 /* thermal cooling device not found */
1313                 mutex_unlock(&thermal_list_lock);
1314                 return;
1315         }
1316         list_del(&cdev->node);
1317
1318         /* Unbind all thermal zones associated with 'this' cdev */
1319         list_for_each_entry(tz, &thermal_tz_list, node) {
1320                 if (tz->ops->unbind) {
1321                         tz->ops->unbind(tz, cdev);
1322                         continue;
1323                 }
1324
1325                 if (!tz->tzp || !tz->tzp->tbp)
1326                         continue;
1327
1328                 tzp = tz->tzp;
1329                 for (i = 0; i < tzp->num_tbps; i++) {
1330                         if (tzp->tbp[i].cdev == cdev) {
1331                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1332                                 tzp->tbp[i].cdev = NULL;
1333                         }
1334                 }
1335         }
1336
1337         mutex_unlock(&thermal_list_lock);
1338
1339         if (cdev->type[0])
1340                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1341         device_remove_file(&cdev->device, &dev_attr_max_state);
1342         device_remove_file(&cdev->device, &dev_attr_cur_state);
1343
1344         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1345         device_unregister(&cdev->device);
1346         return;
1347 }
1348 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1349
1350 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1351 {
1352         struct thermal_instance *instance;
1353         unsigned long target = 0;
1354
1355         /* cooling device is updated*/
1356         if (cdev->updated)
1357                 return;
1358
1359         mutex_lock(&cdev->lock);
1360         /* Make sure cdev enters the deepest cooling state */
1361         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1362                 if (instance->target == THERMAL_NO_TARGET)
1363                         continue;
1364                 if (instance->target > target)
1365                         target = instance->target;
1366         }
1367         mutex_unlock(&cdev->lock);
1368         cdev->ops->set_cur_state(cdev, target);
1369         cdev->updated = true;
1370 }
1371 EXPORT_SYMBOL(thermal_cdev_update);
1372
1373 /**
1374  * notify_thermal_framework - Sensor drivers use this API to notify framework
1375  * @tz:         thermal zone device
1376  * @trip:       indicates which trip point has been crossed
1377  *
1378  * This function handles the trip events from sensor drivers. It starts
1379  * throttling the cooling devices according to the policy configured.
1380  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1381  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1382  * The throttling policy is based on the configured platform data; if no
1383  * platform data is provided, this uses the step_wise throttling policy.
1384  */
1385 void notify_thermal_framework(struct thermal_zone_device *tz, int trip)
1386 {
1387         handle_thermal_trip(tz, trip);
1388 }
1389 EXPORT_SYMBOL(notify_thermal_framework);
1390
1391 /**
1392  * create_trip_attrs - create attributes for trip points
1393  * @tz:         the thermal zone device
1394  * @mask:       Writeable trip point bitmap.
1395  */
1396 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1397 {
1398         int indx;
1399         int size = sizeof(struct thermal_attr) * tz->trips;
1400
1401         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1402         if (!tz->trip_type_attrs)
1403                 return -ENOMEM;
1404
1405         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1406         if (!tz->trip_temp_attrs) {
1407                 kfree(tz->trip_type_attrs);
1408                 return -ENOMEM;
1409         }
1410
1411         if (tz->ops->get_trip_hyst) {
1412                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1413                 if (!tz->trip_hyst_attrs) {
1414                         kfree(tz->trip_type_attrs);
1415                         kfree(tz->trip_temp_attrs);
1416                         return -ENOMEM;
1417                 }
1418         }
1419
1420
1421         for (indx = 0; indx < tz->trips; indx++) {
1422                 /* create trip type attribute */
1423                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1424                          "trip_point_%d_type", indx);
1425
1426                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1427                 tz->trip_type_attrs[indx].attr.attr.name =
1428                                                 tz->trip_type_attrs[indx].name;
1429                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1430                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1431
1432                 device_create_file(&tz->device,
1433                                    &tz->trip_type_attrs[indx].attr);
1434
1435                 /* create trip temp attribute */
1436                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1437                          "trip_point_%d_temp", indx);
1438
1439                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1440                 tz->trip_temp_attrs[indx].attr.attr.name =
1441                                                 tz->trip_temp_attrs[indx].name;
1442                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1443                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1444                 if (mask & (1 << indx)) {
1445                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1446                         tz->trip_temp_attrs[indx].attr.store =
1447                                                         trip_point_temp_store;
1448                 }
1449
1450                 device_create_file(&tz->device,
1451                                    &tz->trip_temp_attrs[indx].attr);
1452
1453                 /* create Optional trip hyst attribute */
1454                 if (!tz->ops->get_trip_hyst)
1455                         continue;
1456                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1457                          "trip_point_%d_hyst", indx);
1458
1459                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1460                 tz->trip_hyst_attrs[indx].attr.attr.name =
1461                                         tz->trip_hyst_attrs[indx].name;
1462                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1463                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1464                 if (tz->ops->set_trip_hyst) {
1465                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1466                         tz->trip_hyst_attrs[indx].attr.store =
1467                                         trip_point_hyst_store;
1468                 }
1469
1470                 device_create_file(&tz->device,
1471                                    &tz->trip_hyst_attrs[indx].attr);
1472         }
1473         return 0;
1474 }
1475
1476 static void remove_trip_attrs(struct thermal_zone_device *tz)
1477 {
1478         int indx;
1479
1480         for (indx = 0; indx < tz->trips; indx++) {
1481                 device_remove_file(&tz->device,
1482                                    &tz->trip_type_attrs[indx].attr);
1483                 device_remove_file(&tz->device,
1484                                    &tz->trip_temp_attrs[indx].attr);
1485                 if (tz->ops->get_trip_hyst)
1486                         device_remove_file(&tz->device,
1487                                   &tz->trip_hyst_attrs[indx].attr);
1488         }
1489         kfree(tz->trip_type_attrs);
1490         kfree(tz->trip_temp_attrs);
1491         kfree(tz->trip_hyst_attrs);
1492 }
1493
1494 /**
1495  * thermal_zone_device_register - register a new thermal zone device
1496  * @type:       the thermal zone device type
1497  * @trips:      the number of trip points the thermal zone support
1498  * @mask:       a bit string indicating the writeablility of trip points
1499  * @devdata:    private device data
1500  * @ops:        standard thermal zone device callbacks
1501  * @tzp:        thermal zone platform parameters
1502  * @passive_delay: number of milliseconds to wait between polls when
1503  *                 performing passive cooling
1504  * @polling_delay: number of milliseconds to wait between polls when checking
1505  *                 whether trip points have been crossed (0 for interrupt
1506  *                 driven systems)
1507  *
1508  * thermal_zone_device_unregister() must be called when the device is no
1509  * longer needed. The passive cooling depends on the .get_trend() return value.
1510  */
1511 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1512         int trips, int mask, void *devdata,
1513         const struct thermal_zone_device_ops *ops,
1514         const struct thermal_zone_params *tzp,
1515         int passive_delay, int polling_delay)
1516 {
1517         struct thermal_zone_device *tz;
1518         enum thermal_trip_type trip_type;
1519         int result;
1520         int count;
1521         int passive = 0;
1522
1523         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1524                 return ERR_PTR(-EINVAL);
1525
1526         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1527                 return ERR_PTR(-EINVAL);
1528
1529         if (!ops || !ops->get_temp)
1530                 return ERR_PTR(-EINVAL);
1531
1532         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1533         if (!tz)
1534                 return ERR_PTR(-ENOMEM);
1535
1536         INIT_LIST_HEAD(&tz->thermal_instances);
1537         idr_init(&tz->idr);
1538         mutex_init(&tz->lock);
1539         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1540         if (result) {
1541                 kfree(tz);
1542                 return ERR_PTR(result);
1543         }
1544
1545         strcpy(tz->type, type ? : "");
1546         tz->ops = ops;
1547         tz->tzp = tzp;
1548         tz->device.class = &thermal_class;
1549         tz->devdata = devdata;
1550         tz->trips = trips;
1551         tz->passive_delay = passive_delay;
1552         tz->polling_delay = polling_delay;
1553
1554         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1555         result = device_register(&tz->device);
1556         if (result) {
1557                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1558                 kfree(tz);
1559                 return ERR_PTR(result);
1560         }
1561
1562         /* sys I/F */
1563         if (type) {
1564                 result = device_create_file(&tz->device, &dev_attr_type);
1565                 if (result)
1566                         goto unregister;
1567         }
1568
1569         result = device_create_file(&tz->device, &dev_attr_temp);
1570         if (result)
1571                 goto unregister;
1572
1573         if (ops->get_mode) {
1574                 result = device_create_file(&tz->device, &dev_attr_mode);
1575                 if (result)
1576                         goto unregister;
1577         }
1578
1579         result = create_trip_attrs(tz, mask);
1580         if (result)
1581                 goto unregister;
1582
1583         for (count = 0; count < trips; count++) {
1584                 tz->ops->get_trip_type(tz, count, &trip_type);
1585                 if (trip_type == THERMAL_TRIP_PASSIVE)
1586                         passive = 1;
1587         }
1588
1589         if (!passive) {
1590                 result = device_create_file(&tz->device, &dev_attr_passive);
1591                 if (result)
1592                         goto unregister;
1593         }
1594
1595         /* Create policy attribute */
1596         result = device_create_file(&tz->device, &dev_attr_policy);
1597         if (result)
1598                 goto unregister;
1599
1600         /* Update 'this' zone's governor information */
1601         mutex_lock(&thermal_governor_lock);
1602
1603         if (tz->tzp)
1604                 tz->governor = __find_governor(tz->tzp->governor_name);
1605         else
1606                 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1607
1608         mutex_unlock(&thermal_governor_lock);
1609
1610         result = thermal_add_hwmon_sysfs(tz);
1611         if (result)
1612                 goto unregister;
1613
1614         mutex_lock(&thermal_list_lock);
1615         list_add_tail(&tz->node, &thermal_tz_list);
1616         mutex_unlock(&thermal_list_lock);
1617
1618         /* Bind cooling devices for this zone */
1619         bind_tz(tz);
1620
1621         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1622
1623         thermal_zone_device_update(tz);
1624
1625         if (!result)
1626                 return tz;
1627
1628 unregister:
1629         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1630         device_unregister(&tz->device);
1631         return ERR_PTR(result);
1632 }
1633 EXPORT_SYMBOL(thermal_zone_device_register);
1634
1635 /**
1636  * thermal_device_unregister - removes the registered thermal zone device
1637  * @tz: the thermal zone device to remove
1638  */
1639 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1640 {
1641         int i;
1642         const struct thermal_zone_params *tzp;
1643         struct thermal_cooling_device *cdev;
1644         struct thermal_zone_device *pos = NULL;
1645
1646         if (!tz)
1647                 return;
1648
1649         tzp = tz->tzp;
1650
1651         mutex_lock(&thermal_list_lock);
1652         list_for_each_entry(pos, &thermal_tz_list, node)
1653             if (pos == tz)
1654                 break;
1655         if (pos != tz) {
1656                 /* thermal zone device not found */
1657                 mutex_unlock(&thermal_list_lock);
1658                 return;
1659         }
1660         list_del(&tz->node);
1661
1662         /* Unbind all cdevs associated with 'this' thermal zone */
1663         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1664                 if (tz->ops->unbind) {
1665                         tz->ops->unbind(tz, cdev);
1666                         continue;
1667                 }
1668
1669                 if (!tzp || !tzp->tbp)
1670                         break;
1671
1672                 for (i = 0; i < tzp->num_tbps; i++) {
1673                         if (tzp->tbp[i].cdev == cdev) {
1674                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1675                                 tzp->tbp[i].cdev = NULL;
1676                         }
1677                 }
1678         }
1679
1680         mutex_unlock(&thermal_list_lock);
1681
1682         thermal_zone_device_set_polling(tz, 0);
1683
1684         if (tz->type[0])
1685                 device_remove_file(&tz->device, &dev_attr_type);
1686         device_remove_file(&tz->device, &dev_attr_temp);
1687         if (tz->ops->get_mode)
1688                 device_remove_file(&tz->device, &dev_attr_mode);
1689         device_remove_file(&tz->device, &dev_attr_policy);
1690         remove_trip_attrs(tz);
1691         tz->governor = NULL;
1692
1693         thermal_remove_hwmon_sysfs(tz);
1694         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1695         idr_destroy(&tz->idr);
1696         mutex_destroy(&tz->lock);
1697         device_unregister(&tz->device);
1698         return;
1699 }
1700 EXPORT_SYMBOL(thermal_zone_device_unregister);
1701
1702 #ifdef CONFIG_NET
1703 static struct genl_family thermal_event_genl_family = {
1704         .id = GENL_ID_GENERATE,
1705         .name = THERMAL_GENL_FAMILY_NAME,
1706         .version = THERMAL_GENL_VERSION,
1707         .maxattr = THERMAL_GENL_ATTR_MAX,
1708 };
1709
1710 static struct genl_multicast_group thermal_event_mcgrp = {
1711         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1712 };
1713
1714 int thermal_generate_netlink_event(u32 orig, enum events event)
1715 {
1716         struct sk_buff *skb;
1717         struct nlattr *attr;
1718         struct thermal_genl_event *thermal_event;
1719         void *msg_header;
1720         int size;
1721         int result;
1722         static unsigned int thermal_event_seqnum;
1723
1724         /* allocate memory */
1725         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1726                nla_total_size(0);
1727
1728         skb = genlmsg_new(size, GFP_ATOMIC);
1729         if (!skb)
1730                 return -ENOMEM;
1731
1732         /* add the genetlink message header */
1733         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1734                                  &thermal_event_genl_family, 0,
1735                                  THERMAL_GENL_CMD_EVENT);
1736         if (!msg_header) {
1737                 nlmsg_free(skb);
1738                 return -ENOMEM;
1739         }
1740
1741         /* fill the data */
1742         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1743                            sizeof(struct thermal_genl_event));
1744
1745         if (!attr) {
1746                 nlmsg_free(skb);
1747                 return -EINVAL;
1748         }
1749
1750         thermal_event = nla_data(attr);
1751         if (!thermal_event) {
1752                 nlmsg_free(skb);
1753                 return -EINVAL;
1754         }
1755
1756         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1757
1758         thermal_event->orig = orig;
1759         thermal_event->event = event;
1760
1761         /* send multicast genetlink message */
1762         result = genlmsg_end(skb, msg_header);
1763         if (result < 0) {
1764                 nlmsg_free(skb);
1765                 return result;
1766         }
1767
1768         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1769         if (result)
1770                 pr_info("failed to send netlink event:%d\n", result);
1771
1772         return result;
1773 }
1774 EXPORT_SYMBOL(thermal_generate_netlink_event);
1775
1776 static int genetlink_init(void)
1777 {
1778         int result;
1779
1780         result = genl_register_family(&thermal_event_genl_family);
1781         if (result)
1782                 return result;
1783
1784         result = genl_register_mc_group(&thermal_event_genl_family,
1785                                         &thermal_event_mcgrp);
1786         if (result)
1787                 genl_unregister_family(&thermal_event_genl_family);
1788         return result;
1789 }
1790
1791 static void genetlink_exit(void)
1792 {
1793         genl_unregister_family(&thermal_event_genl_family);
1794 }
1795 #else /* !CONFIG_NET */
1796 static inline int genetlink_init(void) { return 0; }
1797 static inline void genetlink_exit(void) {}
1798 #endif /* !CONFIG_NET */
1799
1800 static int __init thermal_init(void)
1801 {
1802         int result = 0;
1803
1804         result = class_register(&thermal_class);
1805         if (result) {
1806                 idr_destroy(&thermal_tz_idr);
1807                 idr_destroy(&thermal_cdev_idr);
1808                 mutex_destroy(&thermal_idr_lock);
1809                 mutex_destroy(&thermal_list_lock);
1810         }
1811         result = genetlink_init();
1812         return result;
1813 }
1814
1815 static void __exit thermal_exit(void)
1816 {
1817         class_unregister(&thermal_class);
1818         idr_destroy(&thermal_tz_idr);
1819         idr_destroy(&thermal_cdev_idr);
1820         mutex_destroy(&thermal_idr_lock);
1821         mutex_destroy(&thermal_list_lock);
1822         genetlink_exit();
1823 }
1824
1825 fs_initcall(thermal_init);
1826 module_exit(thermal_exit);