Pileus Git - ~andy/linux/blob - drivers/thermal/thermal_core.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/reboot.h>
  36 #include <linux/string.h>
  37 #include <linux/of.h>
  38 #include <net/netlink.h>
  39 #include <net/genetlink.h>
  40
  41 #include "thermal_core.h"
  42 #include "thermal_hwmon.h"
  43
  44 MODULE_AUTHOR("Zhang Rui");
  45 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  46 MODULE_LICENSE("GPL v2");
  47
  48 static DEFINE_IDR(thermal_tz_idr);
  49 static DEFINE_IDR(thermal_cdev_idr);
  50 static DEFINE_MUTEX(thermal_idr_lock);
  51
  52 static LIST_HEAD(thermal_tz_list);
  53 static LIST_HEAD(thermal_cdev_list);
  54 static LIST_HEAD(thermal_governor_list);
  55
  56 static DEFINE_MUTEX(thermal_list_lock);
  57 static DEFINE_MUTEX(thermal_governor_lock);
  58
  59 static struct thermal_governor *__find_governor(const char *name)
  60 {
  61         struct thermal_governor *pos;
  62
  63         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  64                 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
  65                         return pos;
  66
  67         return NULL;
  68 }
  69
  70 int thermal_register_governor(struct thermal_governor *governor)
  71 {
  72         int err;
  73         const char *name;
  74         struct thermal_zone_device *pos;
  75
  76         if (!governor)
  77                 return -EINVAL;
  78
  79         mutex_lock(&thermal_governor_lock);
  80
  81         err = -EBUSY;
  82         if (__find_governor(governor->name) == NULL) {
  83                 err = 0;
  84                 list_add(&governor->governor_list, &thermal_governor_list);
  85         }
  86
  87         mutex_lock(&thermal_list_lock);
  88
  89         list_for_each_entry(pos, &thermal_tz_list, node) {
  90                 if (pos->governor)
  91                         continue;
  92                 if (pos->tzp)
  93                         name = pos->tzp->governor_name;
  94                 else
  95                         name = DEFAULT_THERMAL_GOVERNOR;
  96                 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
  97                         pos->governor = governor;
  98         }
  99
 100         mutex_unlock(&thermal_list_lock);
 101         mutex_unlock(&thermal_governor_lock);
 102
 103         return err;
 104 }
 105
 106 void thermal_unregister_governor(struct thermal_governor *governor)
 107 {
 108         struct thermal_zone_device *pos;
 109
 110         if (!governor)
 111                 return;
 112
 113         mutex_lock(&thermal_governor_lock);
 114
 115         if (__find_governor(governor->name) == NULL)
 116                 goto exit;
 117
 118         mutex_lock(&thermal_list_lock);
 119
 120         list_for_each_entry(pos, &thermal_tz_list, node) {
 121                 if (!strnicmp(pos->governor->name, governor->name,
 122                                                 THERMAL_NAME_LENGTH))
 123                         pos->governor = NULL;
 124         }
 125
 126         mutex_unlock(&thermal_list_lock);
 127         list_del(&governor->governor_list);
 128 exit:
 129         mutex_unlock(&thermal_governor_lock);
 130         return;
 131 }
 132
 133 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 134 {
 135         int ret;
 136
 137         if (lock)
 138                 mutex_lock(lock);
 139         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 140         if (lock)
 141                 mutex_unlock(lock);
 142         if (unlikely(ret < 0))
 143                 return ret;
 144         *id = ret;
 145         return 0;
 146 }
 147
 148 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 149 {
 150         if (lock)
 151                 mutex_lock(lock);
 152         idr_remove(idr, id);
 153         if (lock)
 154                 mutex_unlock(lock);
 155 }
 156
 157 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 158 {
 159         enum thermal_trend trend;
 160
 161         if (tz->emul_temperature || !tz->ops->get_trend ||
 162             tz->ops->get_trend(tz, trip, &trend)) {
 163                 if (tz->temperature > tz->last_temperature)
 164                         trend = THERMAL_TREND_RAISING;
 165                 else if (tz->temperature < tz->last_temperature)
 166                         trend = THERMAL_TREND_DROPPING;
 167                 else
 168                         trend = THERMAL_TREND_STABLE;
 169         }
 170
 171         return trend;
 172 }
 173 EXPORT_SYMBOL(get_tz_trend);
 174
 175 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 176                         struct thermal_cooling_device *cdev, int trip)
 177 {
 178         struct thermal_instance *pos = NULL;
 179         struct thermal_instance *target_instance = NULL;
 180
 181         mutex_lock(&tz->lock);
 182         mutex_lock(&cdev->lock);
 183
 184         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 185                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 186                         target_instance = pos;
 187                         break;
 188                 }
 189         }
 190
 191         mutex_unlock(&cdev->lock);
 192         mutex_unlock(&tz->lock);
 193
 194         return target_instance;
 195 }
 196 EXPORT_SYMBOL(get_thermal_instance);
 197
 198 static void print_bind_err_msg(struct thermal_zone_device *tz,
 199                         struct thermal_cooling_device *cdev, int ret)
 200 {
 201         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 202                                 tz->type, cdev->type, ret);
 203 }
 204
 205 static void __bind(struct thermal_zone_device *tz, int mask,
 206                         struct thermal_cooling_device *cdev,
 207                         unsigned long *limits)
 208 {
 209         int i, ret;
 210
 211         for (i = 0; i < tz->trips; i++) {
 212                 if (mask & (1 << i)) {
 213                         unsigned long upper, lower;
 214
 215                         upper = THERMAL_NO_LIMIT;
 216                         lower = THERMAL_NO_LIMIT;
 217                         if (limits) {
 218                                 lower = limits[i * 2];
 219                                 upper = limits[i * 2 + 1];
 220                         }
 221                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 222                                                                upper, lower);
 223                         if (ret)
 224                                 print_bind_err_msg(tz, cdev, ret);
 225                 }
 226         }
 227 }
 228
 229 static void __unbind(struct thermal_zone_device *tz, int mask,
 230                         struct thermal_cooling_device *cdev)
 231 {
 232         int i;
 233
 234         for (i = 0; i < tz->trips; i++)
 235                 if (mask & (1 << i))
 236                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 237 }
 238
 239 static void bind_cdev(struct thermal_cooling_device *cdev)
 240 {
 241         int i, ret;
 242         const struct thermal_zone_params *tzp;
 243         struct thermal_zone_device *pos = NULL;
 244
 245         mutex_lock(&thermal_list_lock);
 246
 247         list_for_each_entry(pos, &thermal_tz_list, node) {
 248                 if (!pos->tzp && !pos->ops->bind)
 249                         continue;
 250
 251                 if (pos->ops->bind) {
 252                         ret = pos->ops->bind(pos, cdev);
 253                         if (ret)
 254                                 print_bind_err_msg(pos, cdev, ret);
 255                         continue;
 256                 }
 257
 258                 tzp = pos->tzp;
 259                 if (!tzp || !tzp->tbp)
 260                         continue;
 261
 262                 for (i = 0; i < tzp->num_tbps; i++) {
 263                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 264                                 continue;
 265                         if (tzp->tbp[i].match(pos, cdev))
 266                                 continue;
 267                         tzp->tbp[i].cdev = cdev;
 268                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 269                                tzp->tbp[i].binding_limits);
 270                 }
 271         }
 272
 273         mutex_unlock(&thermal_list_lock);
 274 }
 275
 276 static void bind_tz(struct thermal_zone_device *tz)
 277 {
 278         int i, ret;
 279         struct thermal_cooling_device *pos = NULL;
 280         const struct thermal_zone_params *tzp = tz->tzp;
 281
 282         if (!tzp && !tz->ops->bind)
 283                 return;
 284
 285         mutex_lock(&thermal_list_lock);
 286
 287         /* If there is ops->bind, try to use ops->bind */
 288         if (tz->ops->bind) {
 289                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 290                         ret = tz->ops->bind(tz, pos);
 291                         if (ret)
 292                                 print_bind_err_msg(tz, pos, ret);
 293                 }
 294                 goto exit;
 295         }
 296
 297         if (!tzp || !tzp->tbp)
 298                 goto exit;
 299
 300         list_for_each_entry(pos, &thermal_cdev_list, node) {
 301                 for (i = 0; i < tzp->num_tbps; i++) {
 302                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 303                                 continue;
 304                         if (tzp->tbp[i].match(tz, pos))
 305                                 continue;
 306                         tzp->tbp[i].cdev = pos;
 307                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 308                                tzp->tbp[i].binding_limits);
 309                 }
 310         }
 311 exit:
 312         mutex_unlock(&thermal_list_lock);
 313 }
 314
 315 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 316                                             int delay)
 317 {
 318         if (delay > 1000)
 319                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 320                                  round_jiffies(msecs_to_jiffies(delay)));
 321         else if (delay)
 322                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 323                                  msecs_to_jiffies(delay));
 324         else
 325                 cancel_delayed_work(&tz->poll_queue);
 326 }
 327
 328 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 329 {
 330         mutex_lock(&tz->lock);
 331
 332         if (tz->passive)
 333                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 334         else if (tz->polling_delay)
 335                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 336         else
 337                 thermal_zone_device_set_polling(tz, 0);
 338
 339         mutex_unlock(&tz->lock);
 340 }
 341
 342 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 343                         int trip, enum thermal_trip_type trip_type)
 344 {
 345         if (tz->governor)
 346                 tz->governor->throttle(tz, trip);
 347 }
 348
 349 static void handle_critical_trips(struct thermal_zone_device *tz,
 350                                 int trip, enum thermal_trip_type trip_type)
 351 {
 352         long trip_temp;
 353
 354         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 355
 356         /* If we have not crossed the trip_temp, we do not care. */
 357         if (tz->temperature < trip_temp)
 358                 return;
 359
 360         if (tz->ops->notify)
 361                 tz->ops->notify(tz, trip, trip_type);
 362
 363         if (trip_type == THERMAL_TRIP_CRITICAL) {
 364                 dev_emerg(&tz->device,
 365                           "critical temperature reached(%d C),shutting down\n",
 366                           tz->temperature / 1000);
 367                 orderly_poweroff(true);
 368         }
 369 }
 370
 371 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 372 {
 373         enum thermal_trip_type type;
 374
 375         tz->ops->get_trip_type(tz, trip, &type);
 376
 377         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 378                 handle_critical_trips(tz, trip, type);
 379         else
 380                 handle_non_critical_trips(tz, trip, type);
 381         /*
 382          * Alright, we handled this trip successfully.
 383          * So, start monitoring again.
 384          */
 385         monitor_thermal_zone(tz);
 386 }
 387
 388 /**
 389  * thermal_zone_get_temp() - returns its the temperature of thermal zone
 390  * @tz: a valid pointer to a struct thermal_zone_device
 391  * @temp: a valid pointer to where to store the resulting temperature.
 392  *
 393  * When a valid thermal zone reference is passed, it will fetch its
 394  * temperature and fill @temp.
 395  *
 396  * Return: On success returns 0, an error code otherwise
 397  */
 398 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 399 {
 400         int ret = -EINVAL;
 401 #ifdef CONFIG_THERMAL_EMULATION
 402         int count;
 403         unsigned long crit_temp = -1UL;
 404         enum thermal_trip_type type;
 405 #endif
 406
 407         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 408                 goto exit;
 409
 410         mutex_lock(&tz->lock);
 411
 412         ret = tz->ops->get_temp(tz, temp);
 413 #ifdef CONFIG_THERMAL_EMULATION
 414         if (!tz->emul_temperature)
 415                 goto skip_emul;
 416
 417         for (count = 0; count < tz->trips; count++) {
 418                 ret = tz->ops->get_trip_type(tz, count, &type);
 419                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 420                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 421                         break;
 422                 }
 423         }
 424
 425         if (ret)
 426                 goto skip_emul;
 427
 428         if (*temp < crit_temp)
 429                 *temp = tz->emul_temperature;
 430 skip_emul:
 431 #endif
 432         mutex_unlock(&tz->lock);
 433 exit:
 434         return ret;
 435 }
 436 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 437
 438 static void update_temperature(struct thermal_zone_device *tz)
 439 {
 440         long temp;
 441         int ret;
 442
 443         ret = thermal_zone_get_temp(tz, &temp);
 444         if (ret) {
 445                 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
 446                          tz->id);
 447                 return;
 448         }
 449
 450         mutex_lock(&tz->lock);
 451         tz->last_temperature = tz->temperature;
 452         tz->temperature = temp;
 453         mutex_unlock(&tz->lock);
 454
 455         dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 456                                 tz->last_temperature, tz->temperature);
 457 }
 458
 459 void thermal_zone_device_update(struct thermal_zone_device *tz)
 460 {
 461         int count;
 462
 463         if (!tz->ops->get_temp)
 464                 return;
 465
 466         update_temperature(tz);
 467
 468         for (count = 0; count < tz->trips; count++)
 469                 handle_thermal_trip(tz, count);
 470 }
 471 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 472
 473 static void thermal_zone_device_check(struct work_struct *work)
 474 {
 475         struct thermal_zone_device *tz = container_of(work, struct
 476                                                       thermal_zone_device,
 477                                                       poll_queue.work);
 478         thermal_zone_device_update(tz);
 479 }
 480
 481 /* sys I/F for thermal zone */
 482
 483 #define to_thermal_zone(_dev) \
 484         container_of(_dev, struct thermal_zone_device, device)
 485
 486 static ssize_t
 487 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 488 {
 489         struct thermal_zone_device *tz = to_thermal_zone(dev);
 490
 491         return sprintf(buf, "%s\n", tz->type);
 492 }
 493
 494 static ssize_t
 495 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 496 {
 497         struct thermal_zone_device *tz = to_thermal_zone(dev);
 498         long temperature;
 499         int ret;
 500
 501         ret = thermal_zone_get_temp(tz, &temperature);
 502
 503         if (ret)
 504                 return ret;
 505
 506         return sprintf(buf, "%ld\n", temperature);
 507 }
 508
 509 static ssize_t
 510 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 511 {
 512         struct thermal_zone_device *tz = to_thermal_zone(dev);
 513         enum thermal_device_mode mode;
 514         int result;
 515
 516         if (!tz->ops->get_mode)
 517                 return -EPERM;
 518
 519         result = tz->ops->get_mode(tz, &mode);
 520         if (result)
 521                 return result;
 522
 523         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 524                        : "disabled");
 525 }
 526
 527 static ssize_t
 528 mode_store(struct device *dev, struct device_attribute *attr,
 529            const char *buf, size_t count)
 530 {
 531         struct thermal_zone_device *tz = to_thermal_zone(dev);
 532         int result;
 533
 534         if (!tz->ops->set_mode)
 535                 return -EPERM;
 536
 537         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 538                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 539         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 540                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 541         else
 542                 result = -EINVAL;
 543
 544         if (result)
 545                 return result;
 546
 547         return count;
 548 }
 549
 550 static ssize_t
 551 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 552                      char *buf)
 553 {
 554         struct thermal_zone_device *tz = to_thermal_zone(dev);
 555         enum thermal_trip_type type;
 556         int trip, result;
 557
 558         if (!tz->ops->get_trip_type)
 559                 return -EPERM;
 560
 561         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 562                 return -EINVAL;
 563
 564         result = tz->ops->get_trip_type(tz, trip, &type);
 565         if (result)
 566                 return result;
 567
 568         switch (type) {
 569         case THERMAL_TRIP_CRITICAL:
 570                 return sprintf(buf, "critical\n");
 571         case THERMAL_TRIP_HOT:
 572                 return sprintf(buf, "hot\n");
 573         case THERMAL_TRIP_PASSIVE:
 574                 return sprintf(buf, "passive\n");
 575         case THERMAL_TRIP_ACTIVE:
 576                 return sprintf(buf, "active\n");
 577         default:
 578                 return sprintf(buf, "unknown\n");
 579         }
 580 }
 581
 582 static ssize_t
 583 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 584                      const char *buf, size_t count)
 585 {
 586         struct thermal_zone_device *tz = to_thermal_zone(dev);
 587         int trip, ret;
 588         unsigned long temperature;
 589
 590         if (!tz->ops->set_trip_temp)
 591                 return -EPERM;
 592
 593         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 594                 return -EINVAL;
 595
 596         if (kstrtoul(buf, 10, &temperature))
 597                 return -EINVAL;
 598
 599         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 600
 601         return ret ? ret : count;
 602 }
 603
 604 static ssize_t
 605 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 606                      char *buf)
 607 {
 608         struct thermal_zone_device *tz = to_thermal_zone(dev);
 609         int trip, ret;
 610         long temperature;
 611
 612         if (!tz->ops->get_trip_temp)
 613                 return -EPERM;
 614
 615         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 616                 return -EINVAL;
 617
 618         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 619
 620         if (ret)
 621                 return ret;
 622
 623         return sprintf(buf, "%ld\n", temperature);
 624 }
 625
 626 static ssize_t
 627 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 628                         const char *buf, size_t count)
 629 {
 630         struct thermal_zone_device *tz = to_thermal_zone(dev);
 631         int trip, ret;
 632         unsigned long temperature;
 633
 634         if (!tz->ops->set_trip_hyst)
 635                 return -EPERM;
 636
 637         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 638                 return -EINVAL;
 639
 640         if (kstrtoul(buf, 10, &temperature))
 641                 return -EINVAL;
 642
 643         /*
 644          * We are not doing any check on the 'temperature' value
 645          * here. The driver implementing 'set_trip_hyst' has to
 646          * take care of this.
 647          */
 648         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 649
 650         return ret ? ret : count;
 651 }
 652
 653 static ssize_t
 654 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 655                         char *buf)
 656 {
 657         struct thermal_zone_device *tz = to_thermal_zone(dev);
 658         int trip, ret;
 659         unsigned long temperature;
 660
 661         if (!tz->ops->get_trip_hyst)
 662                 return -EPERM;
 663
 664         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 665                 return -EINVAL;
 666
 667         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 668
 669         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 670 }
 671
 672 static ssize_t
 673 passive_store(struct device *dev, struct device_attribute *attr,
 674                     const char *buf, size_t count)
 675 {
 676         struct thermal_zone_device *tz = to_thermal_zone(dev);
 677         struct thermal_cooling_device *cdev = NULL;
 678         int state;
 679
 680         if (!sscanf(buf, "%d\n", &state))
 681                 return -EINVAL;
 682
 683         /* sanity check: values below 1000 millicelcius don't make sense
 684          * and can cause the system to go into a thermal heart attack
 685          */
 686         if (state && state < 1000)
 687                 return -EINVAL;
 688
 689         if (state && !tz->forced_passive) {
 690                 mutex_lock(&thermal_list_lock);
 691                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 692                         if (!strncmp("Processor", cdev->type,
 693                                      sizeof("Processor")))
 694                                 thermal_zone_bind_cooling_device(tz,
 695                                                 THERMAL_TRIPS_NONE, cdev,
 696                                                 THERMAL_NO_LIMIT,
 697                                                 THERMAL_NO_LIMIT);
 698                 }
 699                 mutex_unlock(&thermal_list_lock);
 700                 if (!tz->passive_delay)
 701                         tz->passive_delay = 1000;
 702         } else if (!state && tz->forced_passive) {
 703                 mutex_lock(&thermal_list_lock);
 704                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 705                         if (!strncmp("Processor", cdev->type,
 706                                      sizeof("Processor")))
 707                                 thermal_zone_unbind_cooling_device(tz,
 708                                                                    THERMAL_TRIPS_NONE,
 709                                                                    cdev);
 710                 }
 711                 mutex_unlock(&thermal_list_lock);
 712                 tz->passive_delay = 0;
 713         }
 714
 715         tz->forced_passive = state;
 716
 717         thermal_zone_device_update(tz);
 718
 719         return count;
 720 }
 721
 722 static ssize_t
 723 passive_show(struct device *dev, struct device_attribute *attr,
 724                    char *buf)
 725 {
 726         struct thermal_zone_device *tz = to_thermal_zone(dev);
 727
 728         return sprintf(buf, "%d\n", tz->forced_passive);
 729 }
 730
 731 static ssize_t
 732 policy_store(struct device *dev, struct device_attribute *attr,
 733                     const char *buf, size_t count)
 734 {
 735         int ret = -EINVAL;
 736         struct thermal_zone_device *tz = to_thermal_zone(dev);
 737         struct thermal_governor *gov;
 738         char name[THERMAL_NAME_LENGTH];
 739
 740         snprintf(name, sizeof(name), "%s", buf);
 741
 742         mutex_lock(&thermal_governor_lock);
 743
 744         gov = __find_governor(strim(name));
 745         if (!gov)
 746                 goto exit;
 747
 748         tz->governor = gov;
 749         ret = count;
 750
 751 exit:
 752         mutex_unlock(&thermal_governor_lock);
 753         return ret;
 754 }
 755
 756 static ssize_t
 757 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 758 {
 759         struct thermal_zone_device *tz = to_thermal_zone(dev);
 760
 761         return sprintf(buf, "%s\n", tz->governor->name);
 762 }
 763
 764 #ifdef CONFIG_THERMAL_EMULATION
 765 static ssize_t
 766 emul_temp_store(struct device *dev, struct device_attribute *attr,
 767                      const char *buf, size_t count)
 768 {
 769         struct thermal_zone_device *tz = to_thermal_zone(dev);
 770         int ret = 0;
 771         unsigned long temperature;
 772
 773         if (kstrtoul(buf, 10, &temperature))
 774                 return -EINVAL;
 775
 776         if (!tz->ops->set_emul_temp) {
 777                 mutex_lock(&tz->lock);
 778                 tz->emul_temperature = temperature;
 779                 mutex_unlock(&tz->lock);
 780         } else {
 781                 ret = tz->ops->set_emul_temp(tz, temperature);
 782         }
 783
 784         if (!ret)
 785                 thermal_zone_device_update(tz);
 786
 787         return ret ? ret : count;
 788 }
 789 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 790 #endif/*CONFIG_THERMAL_EMULATION*/
 791
 792 static DEVICE_ATTR(type, 0444, type_show, NULL);
 793 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 794 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 795 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 796 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 797
 798 /* sys I/F for cooling device */
 799 #define to_cooling_device(_dev) \
 800         container_of(_dev, struct thermal_cooling_device, device)
 801
 802 static ssize_t
 803 thermal_cooling_device_type_show(struct device *dev,
 804                                  struct device_attribute *attr, char *buf)
 805 {
 806         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 807
 808         return sprintf(buf, "%s\n", cdev->type);
 809 }
 810
 811 static ssize_t
 812 thermal_cooling_device_max_state_show(struct device *dev,
 813                                       struct device_attribute *attr, char *buf)
 814 {
 815         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 816         unsigned long state;
 817         int ret;
 818
 819         ret = cdev->ops->get_max_state(cdev, &state);
 820         if (ret)
 821                 return ret;
 822         return sprintf(buf, "%ld\n", state);
 823 }
 824
 825 static ssize_t
 826 thermal_cooling_device_cur_state_show(struct device *dev,
 827                                       struct device_attribute *attr, char *buf)
 828 {
 829         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 830         unsigned long state;
 831         int ret;
 832
 833         ret = cdev->ops->get_cur_state(cdev, &state);
 834         if (ret)
 835                 return ret;
 836         return sprintf(buf, "%ld\n", state);
 837 }
 838
 839 static ssize_t
 840 thermal_cooling_device_cur_state_store(struct device *dev,
 841                                        struct device_attribute *attr,
 842                                        const char *buf, size_t count)
 843 {
 844         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 845         unsigned long state;
 846         int result;
 847
 848         if (!sscanf(buf, "%ld\n", &state))
 849                 return -EINVAL;
 850
 851         if ((long)state < 0)
 852                 return -EINVAL;
 853
 854         result = cdev->ops->set_cur_state(cdev, state);
 855         if (result)
 856                 return result;
 857         return count;
 858 }
 859
 860 static struct device_attribute dev_attr_cdev_type =
 861 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 862 static DEVICE_ATTR(max_state, 0444,
 863                    thermal_cooling_device_max_state_show, NULL);
 864 static DEVICE_ATTR(cur_state, 0644,
 865                    thermal_cooling_device_cur_state_show,
 866                    thermal_cooling_device_cur_state_store);
 867
 868 static ssize_t
 869 thermal_cooling_device_trip_point_show(struct device *dev,
 870                                        struct device_attribute *attr, char *buf)
 871 {
 872         struct thermal_instance *instance;
 873
 874         instance =
 875             container_of(attr, struct thermal_instance, attr);
 876
 877         if (instance->trip == THERMAL_TRIPS_NONE)
 878                 return sprintf(buf, "-1\n");
 879         else
 880                 return sprintf(buf, "%d\n", instance->trip);
 881 }
 882
 883 /* Device management */
 884
 885 /**
 886  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
 887  * @tz:         pointer to struct thermal_zone_device
 888  * @trip:       indicates which trip point the cooling devices is
 889  *              associated with in this thermal zone.
 890  * @cdev:       pointer to struct thermal_cooling_device
 891  * @upper:      the Maximum cooling state for this trip point.
 892  *              THERMAL_NO_LIMIT means no upper limit,
 893  *              and the cooling device can be in max_state.
 894  * @lower:      the Minimum cooling state can be used for this trip point.
 895  *              THERMAL_NO_LIMIT means no lower limit,
 896  *              and the cooling device can be in cooling state 0.
 897  *
 898  * This interface function bind a thermal cooling device to the certain trip
 899  * point of a thermal zone device.
 900  * This function is usually called in the thermal zone device .bind callback.
 901  *
 902  * Return: 0 on success, the proper error value otherwise.
 903  */
 904 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 905                                      int trip,
 906                                      struct thermal_cooling_device *cdev,
 907                                      unsigned long upper, unsigned long lower)
 908 {
 909         struct thermal_instance *dev;
 910         struct thermal_instance *pos;
 911         struct thermal_zone_device *pos1;
 912         struct thermal_cooling_device *pos2;
 913         unsigned long max_state;
 914         int result;
 915
 916         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 917                 return -EINVAL;
 918
 919         list_for_each_entry(pos1, &thermal_tz_list, node) {
 920                 if (pos1 == tz)
 921                         break;
 922         }
 923         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 924                 if (pos2 == cdev)
 925                         break;
 926         }
 927
 928         if (tz != pos1 || cdev != pos2)
 929                 return -EINVAL;
 930
 931         cdev->ops->get_max_state(cdev, &max_state);
 932
 933         /* lower default 0, upper default max_state */
 934         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 935         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 936
 937         if (lower > upper || upper > max_state)
 938                 return -EINVAL;
 939
 940         dev =
 941             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 942         if (!dev)
 943                 return -ENOMEM;
 944         dev->tz = tz;
 945         dev->cdev = cdev;
 946         dev->trip = trip;
 947         dev->upper = upper;
 948         dev->lower = lower;
 949         dev->target = THERMAL_NO_TARGET;
 950
 951         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 952         if (result)
 953                 goto free_mem;
 954
 955         sprintf(dev->name, "cdev%d", dev->id);
 956         result =
 957             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 958         if (result)
 959                 goto release_idr;
 960
 961         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 962         sysfs_attr_init(&dev->attr.attr);
 963         dev->attr.attr.name = dev->attr_name;
 964         dev->attr.attr.mode = 0444;
 965         dev->attr.show = thermal_cooling_device_trip_point_show;
 966         result = device_create_file(&tz->device, &dev->attr);
 967         if (result)
 968                 goto remove_symbol_link;
 969
 970         mutex_lock(&tz->lock);
 971         mutex_lock(&cdev->lock);
 972         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 973             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 974                 result = -EEXIST;
 975                 break;
 976         }
 977         if (!result) {
 978                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 979                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 980         }
 981         mutex_unlock(&cdev->lock);
 982         mutex_unlock(&tz->lock);
 983
 984         if (!result)
 985                 return 0;
 986
 987         device_remove_file(&tz->device, &dev->attr);
 988 remove_symbol_link:
 989         sysfs_remove_link(&tz->device.kobj, dev->name);
 990 release_idr:
 991         release_idr(&tz->idr, &tz->lock, dev->id);
 992 free_mem:
 993         kfree(dev);
 994         return result;
 995 }
 996 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
 997
 998 /**
 999  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1000  *                                        thermal zone.
1001  * @tz:         pointer to a struct thermal_zone_device.
1002  * @trip:       indicates which trip point the cooling devices is
1003  *              associated with in this thermal zone.
1004  * @cdev:       pointer to a struct thermal_cooling_device.
1005  *
1006  * This interface function unbind a thermal cooling device from the certain
1007  * trip point of a thermal zone device.
1008  * This function is usually called in the thermal zone device .unbind callback.
1009  *
1010  * Return: 0 on success, the proper error value otherwise.
1011  */
1012 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1013                                        int trip,
1014                                        struct thermal_cooling_device *cdev)
1015 {
1016         struct thermal_instance *pos, *next;
1017
1018         mutex_lock(&tz->lock);
1019         mutex_lock(&cdev->lock);
1020         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1021                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1022                         list_del(&pos->tz_node);
1023                         list_del(&pos->cdev_node);
1024                         mutex_unlock(&cdev->lock);
1025                         mutex_unlock(&tz->lock);
1026                         goto unbind;
1027                 }
1028         }
1029         mutex_unlock(&cdev->lock);
1030         mutex_unlock(&tz->lock);
1031
1032         return -ENODEV;
1033
1034 unbind:
1035         device_remove_file(&tz->device, &pos->attr);
1036         sysfs_remove_link(&tz->device.kobj, pos->name);
1037         release_idr(&tz->idr, &tz->lock, pos->id);
1038         kfree(pos);
1039         return 0;
1040 }
1041 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1042
1043 static void thermal_release(struct device *dev)
1044 {
1045         struct thermal_zone_device *tz;
1046         struct thermal_cooling_device *cdev;
1047
1048         if (!strncmp(dev_name(dev), "thermal_zone",
1049                      sizeof("thermal_zone") - 1)) {
1050                 tz = to_thermal_zone(dev);
1051                 kfree(tz);
1052         } else if(!strncmp(dev_name(dev), "cooling_device",
1053                         sizeof("cooling_device") - 1)){
1054                 cdev = to_cooling_device(dev);
1055                 kfree(cdev);
1056         }
1057 }
1058
1059 static struct class thermal_class = {
1060         .name = "thermal",
1061         .dev_release = thermal_release,
1062 };
1063
1064 /**
1065  * __thermal_cooling_device_register() - register a new thermal cooling device
1066  * @np:         a pointer to a device tree node.
1067  * @type:       the thermal cooling device type.
1068  * @devdata:    device private data.
1069  * @ops:                standard thermal cooling devices callbacks.
1070  *
1071  * This interface function adds a new thermal cooling device (fan/processor/...)
1072  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1073  * to all the thermal zone devices registered at the same time.
1074  * It also gives the opportunity to link the cooling device to a device tree
1075  * node, so that it can be bound to a thermal zone created out of device tree.
1076  *
1077  * Return: a pointer to the created struct thermal_cooling_device or an
1078  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1079  */
1080 static struct thermal_cooling_device *
1081 __thermal_cooling_device_register(struct device_node *np,
1082                                   char *type, void *devdata,
1083                                   const struct thermal_cooling_device_ops *ops)
1084 {
1085         struct thermal_cooling_device *cdev;
1086         int result;
1087
1088         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1089                 return ERR_PTR(-EINVAL);
1090
1091         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1092             !ops->set_cur_state)
1093                 return ERR_PTR(-EINVAL);
1094
1095         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1096         if (!cdev)
1097                 return ERR_PTR(-ENOMEM);
1098
1099         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1100         if (result) {
1101                 kfree(cdev);
1102                 return ERR_PTR(result);
1103         }
1104
1105         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1106         mutex_init(&cdev->lock);
1107         INIT_LIST_HEAD(&cdev->thermal_instances);
1108         cdev->np = np;
1109         cdev->ops = ops;
1110         cdev->updated = true;
1111         cdev->device.class = &thermal_class;
1112         cdev->devdata = devdata;
1113         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1114         result = device_register(&cdev->device);
1115         if (result) {
1116                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1117                 kfree(cdev);
1118                 return ERR_PTR(result);
1119         }
1120
1121         /* sys I/F */
1122         if (type) {
1123                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1124                 if (result)
1125                         goto unregister;
1126         }
1127
1128         result = device_create_file(&cdev->device, &dev_attr_max_state);
1129         if (result)
1130                 goto unregister;
1131
1132         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1133         if (result)
1134                 goto unregister;
1135
1136         /* Add 'this' new cdev to the global cdev list */
1137         mutex_lock(&thermal_list_lock);
1138         list_add(&cdev->node, &thermal_cdev_list);
1139         mutex_unlock(&thermal_list_lock);
1140
1141         /* Update binding information for 'this' new cdev */
1142         bind_cdev(cdev);
1143
1144         return cdev;
1145
1146 unregister:
1147         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1148         device_unregister(&cdev->device);
1149         return ERR_PTR(result);
1150 }
1151
1152 /**
1153  * thermal_cooling_device_register() - register a new thermal cooling device
1154  * @type:       the thermal cooling device type.
1155  * @devdata:    device private data.
1156  * @ops:                standard thermal cooling devices callbacks.
1157  *
1158  * This interface function adds a new thermal cooling device (fan/processor/...)
1159  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1160  * to all the thermal zone devices registered at the same time.
1161  *
1162  * Return: a pointer to the created struct thermal_cooling_device or an
1163  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1164  */
1165 struct thermal_cooling_device *
1166 thermal_cooling_device_register(char *type, void *devdata,
1167                                 const struct thermal_cooling_device_ops *ops)
1168 {
1169         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1170 }
1171 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1172
1173 /**
1174  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1175  * @np:         a pointer to a device tree node.
1176  * @type:       the thermal cooling device type.
1177  * @devdata:    device private data.
1178  * @ops:                standard thermal cooling devices callbacks.
1179  *
1180  * This function will register a cooling device with device tree node reference.
1181  * This interface function adds a new thermal cooling device (fan/processor/...)
1182  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1183  * to all the thermal zone devices registered at the same time.
1184  *
1185  * Return: a pointer to the created struct thermal_cooling_device or an
1186  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1187  */
1188 struct thermal_cooling_device *
1189 thermal_of_cooling_device_register(struct device_node *np,
1190                                    char *type, void *devdata,
1191                                    const struct thermal_cooling_device_ops *ops)
1192 {
1193         return __thermal_cooling_device_register(np, type, devdata, ops);
1194 }
1195 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1196
1197 /**
1198  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1199  * @cdev:       the thermal cooling device to remove.
1200  *
1201  * thermal_cooling_device_unregister() must be called when the device is no
1202  * longer needed.
1203  */
1204 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1205 {
1206         int i;
1207         const struct thermal_zone_params *tzp;
1208         struct thermal_zone_device *tz;
1209         struct thermal_cooling_device *pos = NULL;
1210
1211         if (!cdev)
1212                 return;
1213
1214         mutex_lock(&thermal_list_lock);
1215         list_for_each_entry(pos, &thermal_cdev_list, node)
1216             if (pos == cdev)
1217                 break;
1218         if (pos != cdev) {
1219                 /* thermal cooling device not found */
1220                 mutex_unlock(&thermal_list_lock);
1221                 return;
1222         }
1223         list_del(&cdev->node);
1224
1225         /* Unbind all thermal zones associated with 'this' cdev */
1226         list_for_each_entry(tz, &thermal_tz_list, node) {
1227                 if (tz->ops->unbind) {
1228                         tz->ops->unbind(tz, cdev);
1229                         continue;
1230                 }
1231
1232                 if (!tz->tzp || !tz->tzp->tbp)
1233                         continue;
1234
1235                 tzp = tz->tzp;
1236                 for (i = 0; i < tzp->num_tbps; i++) {
1237                         if (tzp->tbp[i].cdev == cdev) {
1238                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1239                                 tzp->tbp[i].cdev = NULL;
1240                         }
1241                 }
1242         }
1243
1244         mutex_unlock(&thermal_list_lock);
1245
1246         if (cdev->type[0])
1247                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1248         device_remove_file(&cdev->device, &dev_attr_max_state);
1249         device_remove_file(&cdev->device, &dev_attr_cur_state);
1250
1251         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1252         device_unregister(&cdev->device);
1253         return;
1254 }
1255 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1256
1257 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1258 {
1259         struct thermal_instance *instance;
1260         unsigned long target = 0;
1261
1262         /* cooling device is updated*/
1263         if (cdev->updated)
1264                 return;
1265
1266         mutex_lock(&cdev->lock);
1267         /* Make sure cdev enters the deepest cooling state */
1268         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1269                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1270                                 instance->tz->id, instance->target);
1271                 if (instance->target == THERMAL_NO_TARGET)
1272                         continue;
1273                 if (instance->target > target)
1274                         target = instance->target;
1275         }
1276         mutex_unlock(&cdev->lock);
1277         cdev->ops->set_cur_state(cdev, target);
1278         cdev->updated = true;
1279         dev_dbg(&cdev->device, "set to state %lu\n", target);
1280 }
1281 EXPORT_SYMBOL(thermal_cdev_update);
1282
1283 /**
1284  * thermal_notify_framework - Sensor drivers use this API to notify framework
1285  * @tz:         thermal zone device
1286  * @trip:       indicates which trip point has been crossed
1287  *
1288  * This function handles the trip events from sensor drivers. It starts
1289  * throttling the cooling devices according to the policy configured.
1290  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1291  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1292  * The throttling policy is based on the configured platform data; if no
1293  * platform data is provided, this uses the step_wise throttling policy.
1294  */
1295 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1296 {
1297         handle_thermal_trip(tz, trip);
1298 }
1299 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1300
1301 /**
1302  * create_trip_attrs() - create attributes for trip points
1303  * @tz:         the thermal zone device
1304  * @mask:       Writeable trip point bitmap.
1305  *
1306  * helper function to instantiate sysfs entries for every trip
1307  * point and its properties of a struct thermal_zone_device.
1308  *
1309  * Return: 0 on success, the proper error value otherwise.
1310  */
1311 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1312 {
1313         int indx;
1314         int size = sizeof(struct thermal_attr) * tz->trips;
1315
1316         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1317         if (!tz->trip_type_attrs)
1318                 return -ENOMEM;
1319
1320         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1321         if (!tz->trip_temp_attrs) {
1322                 kfree(tz->trip_type_attrs);
1323                 return -ENOMEM;
1324         }
1325
1326         if (tz->ops->get_trip_hyst) {
1327                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1328                 if (!tz->trip_hyst_attrs) {
1329                         kfree(tz->trip_type_attrs);
1330                         kfree(tz->trip_temp_attrs);
1331                         return -ENOMEM;
1332                 }
1333         }
1334
1335
1336         for (indx = 0; indx < tz->trips; indx++) {
1337                 /* create trip type attribute */
1338                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1339                          "trip_point_%d_type", indx);
1340
1341                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1342                 tz->trip_type_attrs[indx].attr.attr.name =
1343                                                 tz->trip_type_attrs[indx].name;
1344                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1345                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1346
1347                 device_create_file(&tz->device,
1348                                    &tz->trip_type_attrs[indx].attr);
1349
1350                 /* create trip temp attribute */
1351                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1352                          "trip_point_%d_temp", indx);
1353
1354                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1355                 tz->trip_temp_attrs[indx].attr.attr.name =
1356                                                 tz->trip_temp_attrs[indx].name;
1357                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1358                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1359                 if (mask & (1 << indx)) {
1360                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1361                         tz->trip_temp_attrs[indx].attr.store =
1362                                                         trip_point_temp_store;
1363                 }
1364
1365                 device_create_file(&tz->device,
1366                                    &tz->trip_temp_attrs[indx].attr);
1367
1368                 /* create Optional trip hyst attribute */
1369                 if (!tz->ops->get_trip_hyst)
1370                         continue;
1371                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1372                          "trip_point_%d_hyst", indx);
1373
1374                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1375                 tz->trip_hyst_attrs[indx].attr.attr.name =
1376                                         tz->trip_hyst_attrs[indx].name;
1377                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1378                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1379                 if (tz->ops->set_trip_hyst) {
1380                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1381                         tz->trip_hyst_attrs[indx].attr.store =
1382                                         trip_point_hyst_store;
1383                 }
1384
1385                 device_create_file(&tz->device,
1386                                    &tz->trip_hyst_attrs[indx].attr);
1387         }
1388         return 0;
1389 }
1390
1391 static void remove_trip_attrs(struct thermal_zone_device *tz)
1392 {
1393         int indx;
1394
1395         for (indx = 0; indx < tz->trips; indx++) {
1396                 device_remove_file(&tz->device,
1397                                    &tz->trip_type_attrs[indx].attr);
1398                 device_remove_file(&tz->device,
1399                                    &tz->trip_temp_attrs[indx].attr);
1400                 if (tz->ops->get_trip_hyst)
1401                         device_remove_file(&tz->device,
1402                                   &tz->trip_hyst_attrs[indx].attr);
1403         }
1404         kfree(tz->trip_type_attrs);
1405         kfree(tz->trip_temp_attrs);
1406         kfree(tz->trip_hyst_attrs);
1407 }
1408
1409 /**
1410  * thermal_zone_device_register() - register a new thermal zone device
1411  * @type:       the thermal zone device type
1412  * @trips:      the number of trip points the thermal zone support
1413  * @mask:       a bit string indicating the writeablility of trip points
1414  * @devdata:    private device data
1415  * @ops:        standard thermal zone device callbacks
1416  * @tzp:        thermal zone platform parameters
1417  * @passive_delay: number of milliseconds to wait between polls when
1418  *                 performing passive cooling
1419  * @polling_delay: number of milliseconds to wait between polls when checking
1420  *                 whether trip points have been crossed (0 for interrupt
1421  *                 driven systems)
1422  *
1423  * This interface function adds a new thermal zone device (sensor) to
1424  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1425  * thermal cooling devices registered at the same time.
1426  * thermal_zone_device_unregister() must be called when the device is no
1427  * longer needed. The passive cooling depends on the .get_trend() return value.
1428  *
1429  * Return: a pointer to the created struct thermal_zone_device or an
1430  * in case of error, an ERR_PTR. Caller must check return value with
1431  * IS_ERR*() helpers.
1432  */
1433 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1434         int trips, int mask, void *devdata,
1435         struct thermal_zone_device_ops *ops,
1436         const struct thermal_zone_params *tzp,
1437         int passive_delay, int polling_delay)
1438 {
1439         struct thermal_zone_device *tz;
1440         enum thermal_trip_type trip_type;
1441         int result;
1442         int count;
1443         int passive = 0;
1444
1445         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1446                 return ERR_PTR(-EINVAL);
1447
1448         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1449                 return ERR_PTR(-EINVAL);
1450
1451         if (!ops)
1452                 return ERR_PTR(-EINVAL);
1453
1454         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1455                 return ERR_PTR(-EINVAL);
1456
1457         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1458         if (!tz)
1459                 return ERR_PTR(-ENOMEM);
1460
1461         INIT_LIST_HEAD(&tz->thermal_instances);
1462         idr_init(&tz->idr);
1463         mutex_init(&tz->lock);
1464         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1465         if (result) {
1466                 kfree(tz);
1467                 return ERR_PTR(result);
1468         }
1469
1470         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1471         tz->ops = ops;
1472         tz->tzp = tzp;
1473         tz->device.class = &thermal_class;
1474         tz->devdata = devdata;
1475         tz->trips = trips;
1476         tz->passive_delay = passive_delay;
1477         tz->polling_delay = polling_delay;
1478
1479         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1480         result = device_register(&tz->device);
1481         if (result) {
1482                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1483                 kfree(tz);
1484                 return ERR_PTR(result);
1485         }
1486
1487         /* sys I/F */
1488         if (type) {
1489                 result = device_create_file(&tz->device, &dev_attr_type);
1490                 if (result)
1491                         goto unregister;
1492         }
1493
1494         result = device_create_file(&tz->device, &dev_attr_temp);
1495         if (result)
1496                 goto unregister;
1497
1498         if (ops->get_mode) {
1499                 result = device_create_file(&tz->device, &dev_attr_mode);
1500                 if (result)
1501                         goto unregister;
1502         }
1503
1504         result = create_trip_attrs(tz, mask);
1505         if (result)
1506                 goto unregister;
1507
1508         for (count = 0; count < trips; count++) {
1509                 tz->ops->get_trip_type(tz, count, &trip_type);
1510                 if (trip_type == THERMAL_TRIP_PASSIVE)
1511                         passive = 1;
1512         }
1513
1514         if (!passive) {
1515                 result = device_create_file(&tz->device, &dev_attr_passive);
1516                 if (result)
1517                         goto unregister;
1518         }
1519
1520 #ifdef CONFIG_THERMAL_EMULATION
1521         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1522         if (result)
1523                 goto unregister;
1524 #endif
1525         /* Create policy attribute */
1526         result = device_create_file(&tz->device, &dev_attr_policy);
1527         if (result)
1528                 goto unregister;
1529
1530         /* Update 'this' zone's governor information */
1531         mutex_lock(&thermal_governor_lock);
1532
1533         if (tz->tzp)
1534                 tz->governor = __find_governor(tz->tzp->governor_name);
1535         else
1536                 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1537
1538         mutex_unlock(&thermal_governor_lock);
1539
1540         if (!tz->tzp || !tz->tzp->no_hwmon) {
1541                 result = thermal_add_hwmon_sysfs(tz);
1542                 if (result)
1543                         goto unregister;
1544         }
1545
1546         mutex_lock(&thermal_list_lock);
1547         list_add_tail(&tz->node, &thermal_tz_list);
1548         mutex_unlock(&thermal_list_lock);
1549
1550         /* Bind cooling devices for this zone */
1551         bind_tz(tz);
1552
1553         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1554
1555         if (!tz->ops->get_temp)
1556                 thermal_zone_device_set_polling(tz, 0);
1557
1558         thermal_zone_device_update(tz);
1559
1560         if (!result)
1561                 return tz;
1562
1563 unregister:
1564         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1565         device_unregister(&tz->device);
1566         return ERR_PTR(result);
1567 }
1568 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1569
1570 /**
1571  * thermal_device_unregister - removes the registered thermal zone device
1572  * @tz: the thermal zone device to remove
1573  */
1574 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1575 {
1576         int i;
1577         const struct thermal_zone_params *tzp;
1578         struct thermal_cooling_device *cdev;
1579         struct thermal_zone_device *pos = NULL;
1580
1581         if (!tz)
1582                 return;
1583
1584         tzp = tz->tzp;
1585
1586         mutex_lock(&thermal_list_lock);
1587         list_for_each_entry(pos, &thermal_tz_list, node)
1588             if (pos == tz)
1589                 break;
1590         if (pos != tz) {
1591                 /* thermal zone device not found */
1592                 mutex_unlock(&thermal_list_lock);
1593                 return;
1594         }
1595         list_del(&tz->node);
1596
1597         /* Unbind all cdevs associated with 'this' thermal zone */
1598         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1599                 if (tz->ops->unbind) {
1600                         tz->ops->unbind(tz, cdev);
1601                         continue;
1602                 }
1603
1604                 if (!tzp || !tzp->tbp)
1605                         break;
1606
1607                 for (i = 0; i < tzp->num_tbps; i++) {
1608                         if (tzp->tbp[i].cdev == cdev) {
1609                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1610                                 tzp->tbp[i].cdev = NULL;
1611                         }
1612                 }
1613         }
1614
1615         mutex_unlock(&thermal_list_lock);
1616
1617         thermal_zone_device_set_polling(tz, 0);
1618
1619         if (tz->type[0])
1620                 device_remove_file(&tz->device, &dev_attr_type);
1621         device_remove_file(&tz->device, &dev_attr_temp);
1622         if (tz->ops->get_mode)
1623                 device_remove_file(&tz->device, &dev_attr_mode);
1624         device_remove_file(&tz->device, &dev_attr_policy);
1625         remove_trip_attrs(tz);
1626         tz->governor = NULL;
1627
1628         thermal_remove_hwmon_sysfs(tz);
1629         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1630         idr_destroy(&tz->idr);
1631         mutex_destroy(&tz->lock);
1632         device_unregister(&tz->device);
1633         return;
1634 }
1635 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1636
1637 /**
1638  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1639  * @name: thermal zone name to fetch the temperature
1640  *
1641  * When only one zone is found with the passed name, returns a reference to it.
1642  *
1643  * Return: On success returns a reference to an unique thermal zone with
1644  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1645  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1646  */
1647 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1648 {
1649         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1650         unsigned int found = 0;
1651
1652         if (!name)
1653                 goto exit;
1654
1655         mutex_lock(&thermal_list_lock);
1656         list_for_each_entry(pos, &thermal_tz_list, node)
1657                 if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1658                         found++;
1659                         ref = pos;
1660                 }
1661         mutex_unlock(&thermal_list_lock);
1662
1663         /* nothing has been found, thus an error code for it */
1664         if (found == 0)
1665                 ref = ERR_PTR(-ENODEV);
1666         else if (found > 1)
1667         /* Success only when an unique zone is found */
1668                 ref = ERR_PTR(-EEXIST);
1669
1670 exit:
1671         return ref;
1672 }
1673 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1674
1675 #ifdef CONFIG_NET
1676 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1677         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1678 };
1679
1680 static struct genl_family thermal_event_genl_family = {
1681         .id = GENL_ID_GENERATE,
1682         .name = THERMAL_GENL_FAMILY_NAME,
1683         .version = THERMAL_GENL_VERSION,
1684         .maxattr = THERMAL_GENL_ATTR_MAX,
1685         .mcgrps = thermal_event_mcgrps,
1686         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1687 };
1688
1689 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1690                                         enum events event)
1691 {
1692         struct sk_buff *skb;
1693         struct nlattr *attr;
1694         struct thermal_genl_event *thermal_event;
1695         void *msg_header;
1696         int size;
1697         int result;
1698         static unsigned int thermal_event_seqnum;
1699
1700         if (!tz)
1701                 return -EINVAL;
1702
1703         /* allocate memory */
1704         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1705                nla_total_size(0);
1706
1707         skb = genlmsg_new(size, GFP_ATOMIC);
1708         if (!skb)
1709                 return -ENOMEM;
1710
1711         /* add the genetlink message header */
1712         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1713                                  &thermal_event_genl_family, 0,
1714                                  THERMAL_GENL_CMD_EVENT);
1715         if (!msg_header) {
1716                 nlmsg_free(skb);
1717                 return -ENOMEM;
1718         }
1719
1720         /* fill the data */
1721         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1722                            sizeof(struct thermal_genl_event));
1723
1724         if (!attr) {
1725                 nlmsg_free(skb);
1726                 return -EINVAL;
1727         }
1728
1729         thermal_event = nla_data(attr);
1730         if (!thermal_event) {
1731                 nlmsg_free(skb);
1732                 return -EINVAL;
1733         }
1734
1735         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1736
1737         thermal_event->orig = tz->id;
1738         thermal_event->event = event;
1739
1740         /* send multicast genetlink message */
1741         result = genlmsg_end(skb, msg_header);
1742         if (result < 0) {
1743                 nlmsg_free(skb);
1744                 return result;
1745         }
1746
1747         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1748                                    0, GFP_ATOMIC);
1749         if (result)
1750                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1751
1752         return result;
1753 }
1754 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1755
1756 static int genetlink_init(void)
1757 {
1758         return genl_register_family(&thermal_event_genl_family);
1759 }
1760
1761 static void genetlink_exit(void)
1762 {
1763         genl_unregister_family(&thermal_event_genl_family);
1764 }
1765 #else /* !CONFIG_NET */
1766 static inline int genetlink_init(void) { return 0; }
1767 static inline void genetlink_exit(void) {}
1768 #endif /* !CONFIG_NET */
1769
1770 static int __init thermal_register_governors(void)
1771 {
1772         int result;
1773
1774         result = thermal_gov_step_wise_register();
1775         if (result)
1776                 return result;
1777
1778         result = thermal_gov_fair_share_register();
1779         if (result)
1780                 return result;
1781
1782         return thermal_gov_user_space_register();
1783 }
1784
1785 static void thermal_unregister_governors(void)
1786 {
1787         thermal_gov_step_wise_unregister();
1788         thermal_gov_fair_share_unregister();
1789         thermal_gov_user_space_unregister();
1790 }
1791
1792 static int __init thermal_init(void)
1793 {
1794         int result;
1795
1796         result = thermal_register_governors();
1797         if (result)
1798                 goto error;
1799
1800         result = class_register(&thermal_class);
1801         if (result)
1802                 goto unregister_governors;
1803
1804         result = genetlink_init();
1805         if (result)
1806                 goto unregister_class;
1807
1808         result = of_parse_thermal_zones();
1809         if (result)
1810                 goto exit_netlink;
1811
1812         return 0;
1813
1814 exit_netlink:
1815         genetlink_exit();
1816 unregister_governors:
1817         thermal_unregister_governors();
1818 unregister_class:
1819         class_unregister(&thermal_class);
1820 error:
1821         idr_destroy(&thermal_tz_idr);
1822         idr_destroy(&thermal_cdev_idr);
1823         mutex_destroy(&thermal_idr_lock);
1824         mutex_destroy(&thermal_list_lock);
1825         mutex_destroy(&thermal_governor_lock);
1826         return result;
1827 }
1828
1829 static void __exit thermal_exit(void)
1830 {
1831         of_thermal_destroy_zones();
1832         genetlink_exit();
1833         class_unregister(&thermal_class);
1834         thermal_unregister_governors();
1835         idr_destroy(&thermal_tz_idr);
1836         idr_destroy(&thermal_cdev_idr);
1837         mutex_destroy(&thermal_idr_lock);
1838         mutex_destroy(&thermal_list_lock);
1839         mutex_destroy(&thermal_governor_lock);
1840 }
1841
1842 fs_initcall(thermal_init);
1843 module_exit(thermal_exit);