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