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