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 <net/netlink.h>
  37 #include <net/genetlink.h>
  38
  39 #include "thermal_core.h"
  40
  41 MODULE_AUTHOR("Zhang Rui");
  42 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  43 MODULE_LICENSE("GPL");
  44
  45 static DEFINE_IDR(thermal_tz_idr);
  46 static DEFINE_IDR(thermal_cdev_idr);
  47 static DEFINE_MUTEX(thermal_idr_lock);
  48
  49 static LIST_HEAD(thermal_tz_list);
  50 static LIST_HEAD(thermal_cdev_list);
  51 static LIST_HEAD(thermal_governor_list);
  52
  53 static DEFINE_MUTEX(thermal_list_lock);
  54 static DEFINE_MUTEX(thermal_governor_lock);
  55
  56 static struct thermal_governor *__find_governor(const char *name)
  57 {
  58         struct thermal_governor *pos;
  59
  60         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  61                 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
  62                         return pos;
  63
  64         return NULL;
  65 }
  66
  67 int thermal_register_governor(struct thermal_governor *governor)
  68 {
  69         int err;
  70         const char *name;
  71         struct thermal_zone_device *pos;
  72
  73         if (!governor)
  74                 return -EINVAL;
  75
  76         mutex_lock(&thermal_governor_lock);
  77
  78         err = -EBUSY;
  79         if (__find_governor(governor->name) == NULL) {
  80                 err = 0;
  81                 list_add(&governor->governor_list, &thermal_governor_list);
  82         }
  83
  84         mutex_lock(&thermal_list_lock);
  85
  86         list_for_each_entry(pos, &thermal_tz_list, node) {
  87                 if (pos->governor)
  88                         continue;
  89                 if (pos->tzp)
  90                         name = pos->tzp->governor_name;
  91                 else
  92                         name = DEFAULT_THERMAL_GOVERNOR;
  93                 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
  94                         pos->governor = governor;
  95         }
  96
  97         mutex_unlock(&thermal_list_lock);
  98         mutex_unlock(&thermal_governor_lock);
  99
 100         return err;
 101 }
 102
 103 void thermal_unregister_governor(struct thermal_governor *governor)
 104 {
 105         struct thermal_zone_device *pos;
 106
 107         if (!governor)
 108                 return;
 109
 110         mutex_lock(&thermal_governor_lock);
 111
 112         if (__find_governor(governor->name) == NULL)
 113                 goto exit;
 114
 115         mutex_lock(&thermal_list_lock);
 116
 117         list_for_each_entry(pos, &thermal_tz_list, node) {
 118                 if (!strnicmp(pos->governor->name, governor->name,
 119                                                 THERMAL_NAME_LENGTH))
 120                         pos->governor = NULL;
 121         }
 122
 123         mutex_unlock(&thermal_list_lock);
 124         list_del(&governor->governor_list);
 125 exit:
 126         mutex_unlock(&thermal_governor_lock);
 127         return;
 128 }
 129
 130 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 131 {
 132         int ret;
 133
 134         if (lock)
 135                 mutex_lock(lock);
 136         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 137         if (lock)
 138                 mutex_unlock(lock);
 139         if (unlikely(ret < 0))
 140                 return ret;
 141         *id = ret;
 142         return 0;
 143 }
 144
 145 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 146 {
 147         if (lock)
 148                 mutex_lock(lock);
 149         idr_remove(idr, id);
 150         if (lock)
 151                 mutex_unlock(lock);
 152 }
 153
 154 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 155 {
 156         enum thermal_trend trend;
 157
 158         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
 159                 if (tz->temperature > tz->last_temperature)
 160                         trend = THERMAL_TREND_RAISING;
 161                 else if (tz->temperature < tz->last_temperature)
 162                         trend = THERMAL_TREND_DROPPING;
 163                 else
 164                         trend = THERMAL_TREND_STABLE;
 165         }
 166
 167         return trend;
 168 }
 169 EXPORT_SYMBOL(get_tz_trend);
 170
 171 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 172                         struct thermal_cooling_device *cdev, int trip)
 173 {
 174         struct thermal_instance *pos = NULL;
 175         struct thermal_instance *target_instance = NULL;
 176
 177         mutex_lock(&tz->lock);
 178         mutex_lock(&cdev->lock);
 179
 180         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 181                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 182                         target_instance = pos;
 183                         break;
 184                 }
 185         }
 186
 187         mutex_unlock(&cdev->lock);
 188         mutex_unlock(&tz->lock);
 189
 190         return target_instance;
 191 }
 192 EXPORT_SYMBOL(get_thermal_instance);
 193
 194 static void print_bind_err_msg(struct thermal_zone_device *tz,
 195                         struct thermal_cooling_device *cdev, int ret)
 196 {
 197         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 198                                 tz->type, cdev->type, ret);
 199 }
 200
 201 static void __bind(struct thermal_zone_device *tz, int mask,
 202                         struct thermal_cooling_device *cdev)
 203 {
 204         int i, ret;
 205
 206         for (i = 0; i < tz->trips; i++) {
 207                 if (mask & (1 << i)) {
 208                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 209                                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 210                         if (ret)
 211                                 print_bind_err_msg(tz, cdev, ret);
 212                 }
 213         }
 214 }
 215
 216 static void __unbind(struct thermal_zone_device *tz, int mask,
 217                         struct thermal_cooling_device *cdev)
 218 {
 219         int i;
 220
 221         for (i = 0; i < tz->trips; i++)
 222                 if (mask & (1 << i))
 223                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 224 }
 225
 226 static void bind_cdev(struct thermal_cooling_device *cdev)
 227 {
 228         int i, ret;
 229         const struct thermal_zone_params *tzp;
 230         struct thermal_zone_device *pos = NULL;
 231
 232         mutex_lock(&thermal_list_lock);
 233
 234         list_for_each_entry(pos, &thermal_tz_list, node) {
 235                 if (!pos->tzp && !pos->ops->bind)
 236                         continue;
 237
 238                 if (!pos->tzp && pos->ops->bind) {
 239                         ret = pos->ops->bind(pos, cdev);
 240                         if (ret)
 241                                 print_bind_err_msg(pos, cdev, ret);
 242                 }
 243
 244                 tzp = pos->tzp;
 245                 if (!tzp || !tzp->tbp)
 246                         continue;
 247
 248                 for (i = 0; i < tzp->num_tbps; i++) {
 249                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 250                                 continue;
 251                         if (tzp->tbp[i].match(pos, cdev))
 252                                 continue;
 253                         tzp->tbp[i].cdev = cdev;
 254                         __bind(pos, tzp->tbp[i].trip_mask, cdev);
 255                 }
 256         }
 257
 258         mutex_unlock(&thermal_list_lock);
 259 }
 260
 261 static void bind_tz(struct thermal_zone_device *tz)
 262 {
 263         int i, ret;
 264         struct thermal_cooling_device *pos = NULL;
 265         const struct thermal_zone_params *tzp = tz->tzp;
 266
 267         if (!tzp && !tz->ops->bind)
 268                 return;
 269
 270         mutex_lock(&thermal_list_lock);
 271
 272         /* If there is no platform data, try to use ops->bind */
 273         if (!tzp && tz->ops->bind) {
 274                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 275                         ret = tz->ops->bind(tz, pos);
 276                         if (ret)
 277                                 print_bind_err_msg(tz, pos, ret);
 278                 }
 279                 goto exit;
 280         }
 281
 282         if (!tzp || !tzp->tbp)
 283                 goto exit;
 284
 285         list_for_each_entry(pos, &thermal_cdev_list, node) {
 286                 for (i = 0; i < tzp->num_tbps; i++) {
 287                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 288                                 continue;
 289                         if (tzp->tbp[i].match(tz, pos))
 290                                 continue;
 291                         tzp->tbp[i].cdev = pos;
 292                         __bind(tz, tzp->tbp[i].trip_mask, pos);
 293                 }
 294         }
 295 exit:
 296         mutex_unlock(&thermal_list_lock);
 297 }
 298
 299 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 300                                             int delay)
 301 {
 302         if (delay > 1000)
 303                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 304                                  round_jiffies(msecs_to_jiffies(delay)));
 305         else if (delay)
 306                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 307                                  msecs_to_jiffies(delay));
 308         else
 309                 cancel_delayed_work(&tz->poll_queue);
 310 }
 311
 312 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 313 {
 314         mutex_lock(&tz->lock);
 315
 316         if (tz->passive)
 317                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 318         else if (tz->polling_delay)
 319                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 320         else
 321                 thermal_zone_device_set_polling(tz, 0);
 322
 323         mutex_unlock(&tz->lock);
 324 }
 325
 326 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 327                         int trip, enum thermal_trip_type trip_type)
 328 {
 329         if (tz->governor)
 330                 tz->governor->throttle(tz, trip);
 331 }
 332
 333 static void handle_critical_trips(struct thermal_zone_device *tz,
 334                                 int trip, enum thermal_trip_type trip_type)
 335 {
 336         long trip_temp;
 337
 338         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 339
 340         /* If we have not crossed the trip_temp, we do not care. */
 341         if (tz->temperature < trip_temp)
 342                 return;
 343
 344         if (tz->ops->notify)
 345                 tz->ops->notify(tz, trip, trip_type);
 346
 347         if (trip_type == THERMAL_TRIP_CRITICAL) {
 348                 dev_emerg(&tz->device,
 349                           "critical temperature reached(%d C),shutting down\n",
 350                           tz->temperature / 1000);
 351                 orderly_poweroff(true);
 352         }
 353 }
 354
 355 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 356 {
 357         enum thermal_trip_type type;
 358
 359         tz->ops->get_trip_type(tz, trip, &type);
 360
 361         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 362                 handle_critical_trips(tz, trip, type);
 363         else
 364                 handle_non_critical_trips(tz, trip, type);
 365         /*
 366          * Alright, we handled this trip successfully.
 367          * So, start monitoring again.
 368          */
 369         monitor_thermal_zone(tz);
 370 }
 371
 372 /**
 373  * thermal_zone_get_temp() - returns its the temperature of thermal zone
 374  * @tz: a valid pointer to a struct thermal_zone_device
 375  * @temp: a valid pointer to where to store the resulting temperature.
 376  *
 377  * When a valid thermal zone reference is passed, it will fetch its
 378  * temperature and fill @temp.
 379  *
 380  * Return: On success returns 0, an error code otherwise
 381  */
 382 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 383 {
 384         int ret = -EINVAL;
 385 #ifdef CONFIG_THERMAL_EMULATION
 386         int count;
 387         unsigned long crit_temp = -1UL;
 388         enum thermal_trip_type type;
 389 #endif
 390
 391         if (IS_ERR_OR_NULL(tz))
 392                 goto exit;
 393
 394         mutex_lock(&tz->lock);
 395
 396         ret = tz->ops->get_temp(tz, temp);
 397 #ifdef CONFIG_THERMAL_EMULATION
 398         if (!tz->emul_temperature)
 399                 goto skip_emul;
 400
 401         for (count = 0; count < tz->trips; count++) {
 402                 ret = tz->ops->get_trip_type(tz, count, &type);
 403                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 404                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 405                         break;
 406                 }
 407         }
 408
 409         if (ret)
 410                 goto skip_emul;
 411
 412         if (*temp < crit_temp)
 413                 *temp = tz->emul_temperature;
 414 skip_emul:
 415 #endif
 416         mutex_unlock(&tz->lock);
 417 exit:
 418         return ret;
 419 }
 420 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 421
 422 static void update_temperature(struct thermal_zone_device *tz)
 423 {
 424         long temp;
 425         int ret;
 426
 427         ret = thermal_zone_get_temp(tz, &temp);
 428         if (ret) {
 429                 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
 430                          tz->id);
 431                 return;
 432         }
 433
 434         mutex_lock(&tz->lock);
 435         tz->last_temperature = tz->temperature;
 436         tz->temperature = temp;
 437         mutex_unlock(&tz->lock);
 438 }
 439
 440 void thermal_zone_device_update(struct thermal_zone_device *tz)
 441 {
 442         int count;
 443
 444         update_temperature(tz);
 445
 446         for (count = 0; count < tz->trips; count++)
 447                 handle_thermal_trip(tz, count);
 448 }
 449 EXPORT_SYMBOL(thermal_zone_device_update);
 450
 451 static void thermal_zone_device_check(struct work_struct *work)
 452 {
 453         struct thermal_zone_device *tz = container_of(work, struct
 454                                                       thermal_zone_device,
 455                                                       poll_queue.work);
 456         thermal_zone_device_update(tz);
 457 }
 458
 459 /* sys I/F for thermal zone */
 460
 461 #define to_thermal_zone(_dev) \
 462         container_of(_dev, struct thermal_zone_device, device)
 463
 464 static ssize_t
 465 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 466 {
 467         struct thermal_zone_device *tz = to_thermal_zone(dev);
 468
 469         return sprintf(buf, "%s\n", tz->type);
 470 }
 471
 472 static ssize_t
 473 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 474 {
 475         struct thermal_zone_device *tz = to_thermal_zone(dev);
 476         long temperature;
 477         int ret;
 478
 479         ret = thermal_zone_get_temp(tz, &temperature);
 480
 481         if (ret)
 482                 return ret;
 483
 484         return sprintf(buf, "%ld\n", temperature);
 485 }
 486
 487 static ssize_t
 488 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 489 {
 490         struct thermal_zone_device *tz = to_thermal_zone(dev);
 491         enum thermal_device_mode mode;
 492         int result;
 493
 494         if (!tz->ops->get_mode)
 495                 return -EPERM;
 496
 497         result = tz->ops->get_mode(tz, &mode);
 498         if (result)
 499                 return result;
 500
 501         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 502                        : "disabled");
 503 }
 504
 505 static ssize_t
 506 mode_store(struct device *dev, struct device_attribute *attr,
 507            const char *buf, size_t count)
 508 {
 509         struct thermal_zone_device *tz = to_thermal_zone(dev);
 510         int result;
 511
 512         if (!tz->ops->set_mode)
 513                 return -EPERM;
 514
 515         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 516                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 517         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 518                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 519         else
 520                 result = -EINVAL;
 521
 522         if (result)
 523                 return result;
 524
 525         return count;
 526 }
 527
 528 static ssize_t
 529 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 530                      char *buf)
 531 {
 532         struct thermal_zone_device *tz = to_thermal_zone(dev);
 533         enum thermal_trip_type type;
 534         int trip, result;
 535
 536         if (!tz->ops->get_trip_type)
 537                 return -EPERM;
 538
 539         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 540                 return -EINVAL;
 541
 542         result = tz->ops->get_trip_type(tz, trip, &type);
 543         if (result)
 544                 return result;
 545
 546         switch (type) {
 547         case THERMAL_TRIP_CRITICAL:
 548                 return sprintf(buf, "critical\n");
 549         case THERMAL_TRIP_HOT:
 550                 return sprintf(buf, "hot\n");
 551         case THERMAL_TRIP_PASSIVE:
 552                 return sprintf(buf, "passive\n");
 553         case THERMAL_TRIP_ACTIVE:
 554                 return sprintf(buf, "active\n");
 555         default:
 556                 return sprintf(buf, "unknown\n");
 557         }
 558 }
 559
 560 static ssize_t
 561 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 562                      const char *buf, size_t count)
 563 {
 564         struct thermal_zone_device *tz = to_thermal_zone(dev);
 565         int trip, ret;
 566         unsigned long temperature;
 567
 568         if (!tz->ops->set_trip_temp)
 569                 return -EPERM;
 570
 571         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 572                 return -EINVAL;
 573
 574         if (kstrtoul(buf, 10, &temperature))
 575                 return -EINVAL;
 576
 577         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 578
 579         return ret ? ret : count;
 580 }
 581
 582 static ssize_t
 583 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 584                      char *buf)
 585 {
 586         struct thermal_zone_device *tz = to_thermal_zone(dev);
 587         int trip, ret;
 588         long temperature;
 589
 590         if (!tz->ops->get_trip_temp)
 591                 return -EPERM;
 592
 593         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 594                 return -EINVAL;
 595
 596         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 597
 598         if (ret)
 599                 return ret;
 600
 601         return sprintf(buf, "%ld\n", temperature);
 602 }
 603
 604 static ssize_t
 605 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 606                         const char *buf, size_t count)
 607 {
 608         struct thermal_zone_device *tz = to_thermal_zone(dev);
 609         int trip, ret;
 610         unsigned long temperature;
 611
 612         if (!tz->ops->set_trip_hyst)
 613                 return -EPERM;
 614
 615         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 616                 return -EINVAL;
 617
 618         if (kstrtoul(buf, 10, &temperature))
 619                 return -EINVAL;
 620
 621         /*
 622          * We are not doing any check on the 'temperature' value
 623          * here. The driver implementing 'set_trip_hyst' has to
 624          * take care of this.
 625          */
 626         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 627
 628         return ret ? ret : count;
 629 }
 630
 631 static ssize_t
 632 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 633                         char *buf)
 634 {
 635         struct thermal_zone_device *tz = to_thermal_zone(dev);
 636         int trip, ret;
 637         unsigned long temperature;
 638
 639         if (!tz->ops->get_trip_hyst)
 640                 return -EPERM;
 641
 642         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 643                 return -EINVAL;
 644
 645         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 646
 647         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 648 }
 649
 650 static ssize_t
 651 passive_store(struct device *dev, struct device_attribute *attr,
 652                     const char *buf, size_t count)
 653 {
 654         struct thermal_zone_device *tz = to_thermal_zone(dev);
 655         struct thermal_cooling_device *cdev = NULL;
 656         int state;
 657
 658         if (!sscanf(buf, "%d\n", &state))
 659                 return -EINVAL;
 660
 661         /* sanity check: values below 1000 millicelcius don't make sense
 662          * and can cause the system to go into a thermal heart attack
 663          */
 664         if (state && state < 1000)
 665                 return -EINVAL;
 666
 667         if (state && !tz->forced_passive) {
 668                 mutex_lock(&thermal_list_lock);
 669                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 670                         if (!strncmp("Processor", cdev->type,
 671                                      sizeof("Processor")))
 672                                 thermal_zone_bind_cooling_device(tz,
 673                                                 THERMAL_TRIPS_NONE, cdev,
 674                                                 THERMAL_NO_LIMIT,
 675                                                 THERMAL_NO_LIMIT);
 676                 }
 677                 mutex_unlock(&thermal_list_lock);
 678                 if (!tz->passive_delay)
 679                         tz->passive_delay = 1000;
 680         } else if (!state && tz->forced_passive) {
 681                 mutex_lock(&thermal_list_lock);
 682                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 683                         if (!strncmp("Processor", cdev->type,
 684                                      sizeof("Processor")))
 685                                 thermal_zone_unbind_cooling_device(tz,
 686                                                                    THERMAL_TRIPS_NONE,
 687                                                                    cdev);
 688                 }
 689                 mutex_unlock(&thermal_list_lock);
 690                 tz->passive_delay = 0;
 691         }
 692
 693         tz->forced_passive = state;
 694
 695         thermal_zone_device_update(tz);
 696
 697         return count;
 698 }
 699
 700 static ssize_t
 701 passive_show(struct device *dev, struct device_attribute *attr,
 702                    char *buf)
 703 {
 704         struct thermal_zone_device *tz = to_thermal_zone(dev);
 705
 706         return sprintf(buf, "%d\n", tz->forced_passive);
 707 }
 708
 709 static ssize_t
 710 policy_store(struct device *dev, struct device_attribute *attr,
 711                     const char *buf, size_t count)
 712 {
 713         int ret = -EINVAL;
 714         struct thermal_zone_device *tz = to_thermal_zone(dev);
 715         struct thermal_governor *gov;
 716
 717         mutex_lock(&thermal_governor_lock);
 718
 719         gov = __find_governor(buf);
 720         if (!gov)
 721                 goto exit;
 722
 723         tz->governor = gov;
 724         ret = count;
 725
 726 exit:
 727         mutex_unlock(&thermal_governor_lock);
 728         return ret;
 729 }
 730
 731 static ssize_t
 732 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 733 {
 734         struct thermal_zone_device *tz = to_thermal_zone(dev);
 735
 736         return sprintf(buf, "%s\n", tz->governor->name);
 737 }
 738
 739 #ifdef CONFIG_THERMAL_EMULATION
 740 static ssize_t
 741 emul_temp_store(struct device *dev, struct device_attribute *attr,
 742                      const char *buf, size_t count)
 743 {
 744         struct thermal_zone_device *tz = to_thermal_zone(dev);
 745         int ret = 0;
 746         unsigned long temperature;
 747
 748         if (kstrtoul(buf, 10, &temperature))
 749                 return -EINVAL;
 750
 751         if (!tz->ops->set_emul_temp) {
 752                 mutex_lock(&tz->lock);
 753                 tz->emul_temperature = temperature;
 754                 mutex_unlock(&tz->lock);
 755         } else {
 756                 ret = tz->ops->set_emul_temp(tz, temperature);
 757         }
 758
 759         return ret ? ret : count;
 760 }
 761 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 762 #endif/*CONFIG_THERMAL_EMULATION*/
 763
 764 static DEVICE_ATTR(type, 0444, type_show, NULL);
 765 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 766 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 767 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 768 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 769
 770 /* sys I/F for cooling device */
 771 #define to_cooling_device(_dev) \
 772         container_of(_dev, struct thermal_cooling_device, device)
 773
 774 static ssize_t
 775 thermal_cooling_device_type_show(struct device *dev,
 776                                  struct device_attribute *attr, char *buf)
 777 {
 778         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 779
 780         return sprintf(buf, "%s\n", cdev->type);
 781 }
 782
 783 static ssize_t
 784 thermal_cooling_device_max_state_show(struct device *dev,
 785                                       struct device_attribute *attr, char *buf)
 786 {
 787         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 788         unsigned long state;
 789         int ret;
 790
 791         ret = cdev->ops->get_max_state(cdev, &state);
 792         if (ret)
 793                 return ret;
 794         return sprintf(buf, "%ld\n", state);
 795 }
 796
 797 static ssize_t
 798 thermal_cooling_device_cur_state_show(struct device *dev,
 799                                       struct device_attribute *attr, char *buf)
 800 {
 801         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 802         unsigned long state;
 803         int ret;
 804
 805         ret = cdev->ops->get_cur_state(cdev, &state);
 806         if (ret)
 807                 return ret;
 808         return sprintf(buf, "%ld\n", state);
 809 }
 810
 811 static ssize_t
 812 thermal_cooling_device_cur_state_store(struct device *dev,
 813                                        struct device_attribute *attr,
 814                                        const char *buf, size_t count)
 815 {
 816         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 817         unsigned long state;
 818         int result;
 819
 820         if (!sscanf(buf, "%ld\n", &state))
 821                 return -EINVAL;
 822
 823         if ((long)state < 0)
 824                 return -EINVAL;
 825
 826         result = cdev->ops->set_cur_state(cdev, state);
 827         if (result)
 828                 return result;
 829         return count;
 830 }
 831
 832 static struct device_attribute dev_attr_cdev_type =
 833 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 834 static DEVICE_ATTR(max_state, 0444,
 835                    thermal_cooling_device_max_state_show, NULL);
 836 static DEVICE_ATTR(cur_state, 0644,
 837                    thermal_cooling_device_cur_state_show,
 838                    thermal_cooling_device_cur_state_store);
 839
 840 static ssize_t
 841 thermal_cooling_device_trip_point_show(struct device *dev,
 842                                        struct device_attribute *attr, char *buf)
 843 {
 844         struct thermal_instance *instance;
 845
 846         instance =
 847             container_of(attr, struct thermal_instance, attr);
 848
 849         if (instance->trip == THERMAL_TRIPS_NONE)
 850                 return sprintf(buf, "-1\n");
 851         else
 852                 return sprintf(buf, "%d\n", instance->trip);
 853 }
 854
 855 /* Device management */
 856
 857 #if defined(CONFIG_THERMAL_HWMON)
 858
 859 /* hwmon sys I/F */
 860 #include <linux/hwmon.h>
 861
 862 /* thermal zone devices with the same type share one hwmon device */
 863 struct thermal_hwmon_device {
 864         char type[THERMAL_NAME_LENGTH];
 865         struct device *device;
 866         int count;
 867         struct list_head tz_list;
 868         struct list_head node;
 869 };
 870
 871 struct thermal_hwmon_attr {
 872         struct device_attribute attr;
 873         char name[16];
 874 };
 875
 876 /* one temperature input for each thermal zone */
 877 struct thermal_hwmon_temp {
 878         struct list_head hwmon_node;
 879         struct thermal_zone_device *tz;
 880         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 881         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 882 };
 883
 884 static LIST_HEAD(thermal_hwmon_list);
 885
 886 static ssize_t
 887 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 888 {
 889         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 890         return sprintf(buf, "%s\n", hwmon->type);
 891 }
 892 static DEVICE_ATTR(name, 0444, name_show, NULL);
 893
 894 static ssize_t
 895 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 896 {
 897         long temperature;
 898         int ret;
 899         struct thermal_hwmon_attr *hwmon_attr
 900                         = container_of(attr, struct thermal_hwmon_attr, attr);
 901         struct thermal_hwmon_temp *temp
 902                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 903                                        temp_input);
 904         struct thermal_zone_device *tz = temp->tz;
 905
 906         ret = thermal_zone_get_temp(tz, &temperature);
 907
 908         if (ret)
 909                 return ret;
 910
 911         return sprintf(buf, "%ld\n", temperature);
 912 }
 913
 914 static ssize_t
 915 temp_crit_show(struct device *dev, struct device_attribute *attr,
 916                 char *buf)
 917 {
 918         struct thermal_hwmon_attr *hwmon_attr
 919                         = container_of(attr, struct thermal_hwmon_attr, attr);
 920         struct thermal_hwmon_temp *temp
 921                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 922                                        temp_crit);
 923         struct thermal_zone_device *tz = temp->tz;
 924         long temperature;
 925         int ret;
 926
 927         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 928         if (ret)
 929                 return ret;
 930
 931         return sprintf(buf, "%ld\n", temperature);
 932 }
 933
 934
 935 static struct thermal_hwmon_device *
 936 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 937 {
 938         struct thermal_hwmon_device *hwmon;
 939
 940         mutex_lock(&thermal_list_lock);
 941         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 942                 if (!strcmp(hwmon->type, tz->type)) {
 943                         mutex_unlock(&thermal_list_lock);
 944                         return hwmon;
 945                 }
 946         mutex_unlock(&thermal_list_lock);
 947
 948         return NULL;
 949 }
 950
 951 /* Find the temperature input matching a given thermal zone */
 952 static struct thermal_hwmon_temp *
 953 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 954                           const struct thermal_zone_device *tz)
 955 {
 956         struct thermal_hwmon_temp *temp;
 957
 958         mutex_lock(&thermal_list_lock);
 959         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 960                 if (temp->tz == tz) {
 961                         mutex_unlock(&thermal_list_lock);
 962                         return temp;
 963                 }
 964         mutex_unlock(&thermal_list_lock);
 965
 966         return NULL;
 967 }
 968
 969 static int
 970 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 971 {
 972         struct thermal_hwmon_device *hwmon;
 973         struct thermal_hwmon_temp *temp;
 974         int new_hwmon_device = 1;
 975         int result;
 976
 977         hwmon = thermal_hwmon_lookup_by_type(tz);
 978         if (hwmon) {
 979                 new_hwmon_device = 0;
 980                 goto register_sys_interface;
 981         }
 982
 983         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 984         if (!hwmon)
 985                 return -ENOMEM;
 986
 987         INIT_LIST_HEAD(&hwmon->tz_list);
 988         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 989         hwmon->device = hwmon_device_register(NULL);
 990         if (IS_ERR(hwmon->device)) {
 991                 result = PTR_ERR(hwmon->device);
 992                 goto free_mem;
 993         }
 994         dev_set_drvdata(hwmon->device, hwmon);
 995         result = device_create_file(hwmon->device, &dev_attr_name);
 996         if (result)
 997                 goto free_mem;
 998
 999  register_sys_interface:
1000         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
1001         if (!temp) {
1002                 result = -ENOMEM;
1003                 goto unregister_name;
1004         }
1005
1006         temp->tz = tz;
1007         hwmon->count++;
1008
1009         snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
1010                  "temp%d_input", hwmon->count);
1011         temp->temp_input.attr.attr.name = temp->temp_input.name;
1012         temp->temp_input.attr.attr.mode = 0444;
1013         temp->temp_input.attr.show = temp_input_show;
1014         sysfs_attr_init(&temp->temp_input.attr.attr);
1015         result = device_create_file(hwmon->device, &temp->temp_input.attr);
1016         if (result)
1017                 goto free_temp_mem;
1018
1019         if (tz->ops->get_crit_temp) {
1020                 unsigned long temperature;
1021                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
1022                         snprintf(temp->temp_crit.name,
1023                                  sizeof(temp->temp_crit.name),
1024                                 "temp%d_crit", hwmon->count);
1025                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
1026                         temp->temp_crit.attr.attr.mode = 0444;
1027                         temp->temp_crit.attr.show = temp_crit_show;
1028                         sysfs_attr_init(&temp->temp_crit.attr.attr);
1029                         result = device_create_file(hwmon->device,
1030                                                     &temp->temp_crit.attr);
1031                         if (result)
1032                                 goto unregister_input;
1033                 }
1034         }
1035
1036         mutex_lock(&thermal_list_lock);
1037         if (new_hwmon_device)
1038                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
1039         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
1040         mutex_unlock(&thermal_list_lock);
1041
1042         return 0;
1043
1044  unregister_input:
1045         device_remove_file(hwmon->device, &temp->temp_input.attr);
1046  free_temp_mem:
1047         kfree(temp);
1048  unregister_name:
1049         if (new_hwmon_device) {
1050                 device_remove_file(hwmon->device, &dev_attr_name);
1051                 hwmon_device_unregister(hwmon->device);
1052         }
1053  free_mem:
1054         if (new_hwmon_device)
1055                 kfree(hwmon);
1056
1057         return result;
1058 }
1059
1060 static void
1061 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1062 {
1063         struct thermal_hwmon_device *hwmon;
1064         struct thermal_hwmon_temp *temp;
1065
1066         hwmon = thermal_hwmon_lookup_by_type(tz);
1067         if (unlikely(!hwmon)) {
1068                 /* Should never happen... */
1069                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
1070                 return;
1071         }
1072
1073         temp = thermal_hwmon_lookup_temp(hwmon, tz);
1074         if (unlikely(!temp)) {
1075                 /* Should never happen... */
1076                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
1077                 return;
1078         }
1079
1080         device_remove_file(hwmon->device, &temp->temp_input.attr);
1081         if (tz->ops->get_crit_temp)
1082                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
1083
1084         mutex_lock(&thermal_list_lock);
1085         list_del(&temp->hwmon_node);
1086         kfree(temp);
1087         if (!list_empty(&hwmon->tz_list)) {
1088                 mutex_unlock(&thermal_list_lock);
1089                 return;
1090         }
1091         list_del(&hwmon->node);
1092         mutex_unlock(&thermal_list_lock);
1093
1094         device_remove_file(hwmon->device, &dev_attr_name);
1095         hwmon_device_unregister(hwmon->device);
1096         kfree(hwmon);
1097 }
1098 #else
1099 static int
1100 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
1101 {
1102         return 0;
1103 }
1104
1105 static void
1106 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1107 {
1108 }
1109 #endif
1110
1111 /**
1112  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
1113  * @tz:         thermal zone device
1114  * @trip:       indicates which trip point the cooling devices is
1115  *              associated with in this thermal zone.
1116  * @cdev:       thermal cooling device
1117  *
1118  * This function is usually called in the thermal zone device .bind callback.
1119  */
1120 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1121                                      int trip,
1122                                      struct thermal_cooling_device *cdev,
1123                                      unsigned long upper, unsigned long lower)
1124 {
1125         struct thermal_instance *dev;
1126         struct thermal_instance *pos;
1127         struct thermal_zone_device *pos1;
1128         struct thermal_cooling_device *pos2;
1129         unsigned long max_state;
1130         int result;
1131
1132         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1133                 return -EINVAL;
1134
1135         list_for_each_entry(pos1, &thermal_tz_list, node) {
1136                 if (pos1 == tz)
1137                         break;
1138         }
1139         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1140                 if (pos2 == cdev)
1141                         break;
1142         }
1143
1144         if (tz != pos1 || cdev != pos2)
1145                 return -EINVAL;
1146
1147         cdev->ops->get_max_state(cdev, &max_state);
1148
1149         /* lower default 0, upper default max_state */
1150         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1151         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1152
1153         if (lower > upper || upper > max_state)
1154                 return -EINVAL;
1155
1156         dev =
1157             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1158         if (!dev)
1159                 return -ENOMEM;
1160         dev->tz = tz;
1161         dev->cdev = cdev;
1162         dev->trip = trip;
1163         dev->upper = upper;
1164         dev->lower = lower;
1165         dev->target = THERMAL_NO_TARGET;
1166
1167         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1168         if (result)
1169                 goto free_mem;
1170
1171         sprintf(dev->name, "cdev%d", dev->id);
1172         result =
1173             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1174         if (result)
1175                 goto release_idr;
1176
1177         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1178         sysfs_attr_init(&dev->attr.attr);
1179         dev->attr.attr.name = dev->attr_name;
1180         dev->attr.attr.mode = 0444;
1181         dev->attr.show = thermal_cooling_device_trip_point_show;
1182         result = device_create_file(&tz->device, &dev->attr);
1183         if (result)
1184                 goto remove_symbol_link;
1185
1186         mutex_lock(&tz->lock);
1187         mutex_lock(&cdev->lock);
1188         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1189             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1190                 result = -EEXIST;
1191                 break;
1192         }
1193         if (!result) {
1194                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1195                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1196         }
1197         mutex_unlock(&cdev->lock);
1198         mutex_unlock(&tz->lock);
1199
1200         if (!result)
1201                 return 0;
1202
1203         device_remove_file(&tz->device, &dev->attr);
1204 remove_symbol_link:
1205         sysfs_remove_link(&tz->device.kobj, dev->name);
1206 release_idr:
1207         release_idr(&tz->idr, &tz->lock, dev->id);
1208 free_mem:
1209         kfree(dev);
1210         return result;
1211 }
1212 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
1213
1214 /**
1215  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
1216  * @tz:         thermal zone device
1217  * @trip:       indicates which trip point the cooling devices is
1218  *              associated with in this thermal zone.
1219  * @cdev:       thermal cooling device
1220  *
1221  * This function is usually called in the thermal zone device .unbind callback.
1222  */
1223 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1224                                        int trip,
1225                                        struct thermal_cooling_device *cdev)
1226 {
1227         struct thermal_instance *pos, *next;
1228
1229         mutex_lock(&tz->lock);
1230         mutex_lock(&cdev->lock);
1231         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1232                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1233                         list_del(&pos->tz_node);
1234                         list_del(&pos->cdev_node);
1235                         mutex_unlock(&cdev->lock);
1236                         mutex_unlock(&tz->lock);
1237                         goto unbind;
1238                 }
1239         }
1240         mutex_unlock(&cdev->lock);
1241         mutex_unlock(&tz->lock);
1242
1243         return -ENODEV;
1244
1245 unbind:
1246         device_remove_file(&tz->device, &pos->attr);
1247         sysfs_remove_link(&tz->device.kobj, pos->name);
1248         release_idr(&tz->idr, &tz->lock, pos->id);
1249         kfree(pos);
1250         return 0;
1251 }
1252 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
1253
1254 static void thermal_release(struct device *dev)
1255 {
1256         struct thermal_zone_device *tz;
1257         struct thermal_cooling_device *cdev;
1258
1259         if (!strncmp(dev_name(dev), "thermal_zone",
1260                      sizeof("thermal_zone") - 1)) {
1261                 tz = to_thermal_zone(dev);
1262                 kfree(tz);
1263         } else {
1264                 cdev = to_cooling_device(dev);
1265                 kfree(cdev);
1266         }
1267 }
1268
1269 static struct class thermal_class = {
1270         .name = "thermal",
1271         .dev_release = thermal_release,
1272 };
1273
1274 /**
1275  * thermal_cooling_device_register - register a new thermal cooling device
1276  * @type:       the thermal cooling device type.
1277  * @devdata:    device private data.
1278  * @ops:                standard thermal cooling devices callbacks.
1279  */
1280 struct thermal_cooling_device *
1281 thermal_cooling_device_register(char *type, void *devdata,
1282                                 const struct thermal_cooling_device_ops *ops)
1283 {
1284         struct thermal_cooling_device *cdev;
1285         int result;
1286
1287         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1288                 return ERR_PTR(-EINVAL);
1289
1290         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1291             !ops->set_cur_state)
1292                 return ERR_PTR(-EINVAL);
1293
1294         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1295         if (!cdev)
1296                 return ERR_PTR(-ENOMEM);
1297
1298         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1299         if (result) {
1300                 kfree(cdev);
1301                 return ERR_PTR(result);
1302         }
1303
1304         strcpy(cdev->type, type ? : "");
1305         mutex_init(&cdev->lock);
1306         INIT_LIST_HEAD(&cdev->thermal_instances);
1307         cdev->ops = ops;
1308         cdev->updated = true;
1309         cdev->device.class = &thermal_class;
1310         cdev->devdata = devdata;
1311         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1312         result = device_register(&cdev->device);
1313         if (result) {
1314                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1315                 kfree(cdev);
1316                 return ERR_PTR(result);
1317         }
1318
1319         /* sys I/F */
1320         if (type) {
1321                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1322                 if (result)
1323                         goto unregister;
1324         }
1325
1326         result = device_create_file(&cdev->device, &dev_attr_max_state);
1327         if (result)
1328                 goto unregister;
1329
1330         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1331         if (result)
1332                 goto unregister;
1333
1334         /* Add 'this' new cdev to the global cdev list */
1335         mutex_lock(&thermal_list_lock);
1336         list_add(&cdev->node, &thermal_cdev_list);
1337         mutex_unlock(&thermal_list_lock);
1338
1339         /* Update binding information for 'this' new cdev */
1340         bind_cdev(cdev);
1341
1342         return cdev;
1343
1344 unregister:
1345         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1346         device_unregister(&cdev->device);
1347         return ERR_PTR(result);
1348 }
1349 EXPORT_SYMBOL(thermal_cooling_device_register);
1350
1351 /**
1352  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1353  * @cdev:       the thermal cooling device to remove.
1354  *
1355  * thermal_cooling_device_unregister() must be called when the device is no
1356  * longer needed.
1357  */
1358 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1359 {
1360         int i;
1361         const struct thermal_zone_params *tzp;
1362         struct thermal_zone_device *tz;
1363         struct thermal_cooling_device *pos = NULL;
1364
1365         if (!cdev)
1366                 return;
1367
1368         mutex_lock(&thermal_list_lock);
1369         list_for_each_entry(pos, &thermal_cdev_list, node)
1370             if (pos == cdev)
1371                 break;
1372         if (pos != cdev) {
1373                 /* thermal cooling device not found */
1374                 mutex_unlock(&thermal_list_lock);
1375                 return;
1376         }
1377         list_del(&cdev->node);
1378
1379         /* Unbind all thermal zones associated with 'this' cdev */
1380         list_for_each_entry(tz, &thermal_tz_list, node) {
1381                 if (tz->ops->unbind) {
1382                         tz->ops->unbind(tz, cdev);
1383                         continue;
1384                 }
1385
1386                 if (!tz->tzp || !tz->tzp->tbp)
1387                         continue;
1388
1389                 tzp = tz->tzp;
1390                 for (i = 0; i < tzp->num_tbps; i++) {
1391                         if (tzp->tbp[i].cdev == cdev) {
1392                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1393                                 tzp->tbp[i].cdev = NULL;
1394                         }
1395                 }
1396         }
1397
1398         mutex_unlock(&thermal_list_lock);
1399
1400         if (cdev->type[0])
1401                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1402         device_remove_file(&cdev->device, &dev_attr_max_state);
1403         device_remove_file(&cdev->device, &dev_attr_cur_state);
1404
1405         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1406         device_unregister(&cdev->device);
1407         return;
1408 }
1409 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1410
1411 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1412 {
1413         struct thermal_instance *instance;
1414         unsigned long target = 0;
1415
1416         /* cooling device is updated*/
1417         if (cdev->updated)
1418                 return;
1419
1420         mutex_lock(&cdev->lock);
1421         /* Make sure cdev enters the deepest cooling state */
1422         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1423                 if (instance->target == THERMAL_NO_TARGET)
1424                         continue;
1425                 if (instance->target > target)
1426                         target = instance->target;
1427         }
1428         mutex_unlock(&cdev->lock);
1429         cdev->ops->set_cur_state(cdev, target);
1430         cdev->updated = true;
1431 }
1432 EXPORT_SYMBOL(thermal_cdev_update);
1433
1434 /**
1435  * notify_thermal_framework - Sensor drivers use this API to notify framework
1436  * @tz:         thermal zone device
1437  * @trip:       indicates which trip point has been crossed
1438  *
1439  * This function handles the trip events from sensor drivers. It starts
1440  * throttling the cooling devices according to the policy configured.
1441  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1442  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1443  * The throttling policy is based on the configured platform data; if no
1444  * platform data is provided, this uses the step_wise throttling policy.
1445  */
1446 void notify_thermal_framework(struct thermal_zone_device *tz, int trip)
1447 {
1448         handle_thermal_trip(tz, trip);
1449 }
1450 EXPORT_SYMBOL(notify_thermal_framework);
1451
1452 /**
1453  * create_trip_attrs - create attributes for trip points
1454  * @tz:         the thermal zone device
1455  * @mask:       Writeable trip point bitmap.
1456  */
1457 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1458 {
1459         int indx;
1460         int size = sizeof(struct thermal_attr) * tz->trips;
1461
1462         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1463         if (!tz->trip_type_attrs)
1464                 return -ENOMEM;
1465
1466         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1467         if (!tz->trip_temp_attrs) {
1468                 kfree(tz->trip_type_attrs);
1469                 return -ENOMEM;
1470         }
1471
1472         if (tz->ops->get_trip_hyst) {
1473                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1474                 if (!tz->trip_hyst_attrs) {
1475                         kfree(tz->trip_type_attrs);
1476                         kfree(tz->trip_temp_attrs);
1477                         return -ENOMEM;
1478                 }
1479         }
1480
1481
1482         for (indx = 0; indx < tz->trips; indx++) {
1483                 /* create trip type attribute */
1484                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1485                          "trip_point_%d_type", indx);
1486
1487                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1488                 tz->trip_type_attrs[indx].attr.attr.name =
1489                                                 tz->trip_type_attrs[indx].name;
1490                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1491                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1492
1493                 device_create_file(&tz->device,
1494                                    &tz->trip_type_attrs[indx].attr);
1495
1496                 /* create trip temp attribute */
1497                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1498                          "trip_point_%d_temp", indx);
1499
1500                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1501                 tz->trip_temp_attrs[indx].attr.attr.name =
1502                                                 tz->trip_temp_attrs[indx].name;
1503                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1504                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1505                 if (mask & (1 << indx)) {
1506                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1507                         tz->trip_temp_attrs[indx].attr.store =
1508                                                         trip_point_temp_store;
1509                 }
1510
1511                 device_create_file(&tz->device,
1512                                    &tz->trip_temp_attrs[indx].attr);
1513
1514                 /* create Optional trip hyst attribute */
1515                 if (!tz->ops->get_trip_hyst)
1516                         continue;
1517                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1518                          "trip_point_%d_hyst", indx);
1519
1520                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1521                 tz->trip_hyst_attrs[indx].attr.attr.name =
1522                                         tz->trip_hyst_attrs[indx].name;
1523                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1524                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1525                 if (tz->ops->set_trip_hyst) {
1526                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1527                         tz->trip_hyst_attrs[indx].attr.store =
1528                                         trip_point_hyst_store;
1529                 }
1530
1531                 device_create_file(&tz->device,
1532                                    &tz->trip_hyst_attrs[indx].attr);
1533         }
1534         return 0;
1535 }
1536
1537 static void remove_trip_attrs(struct thermal_zone_device *tz)
1538 {
1539         int indx;
1540
1541         for (indx = 0; indx < tz->trips; indx++) {
1542                 device_remove_file(&tz->device,
1543                                    &tz->trip_type_attrs[indx].attr);
1544                 device_remove_file(&tz->device,
1545                                    &tz->trip_temp_attrs[indx].attr);
1546                 if (tz->ops->get_trip_hyst)
1547                         device_remove_file(&tz->device,
1548                                   &tz->trip_hyst_attrs[indx].attr);
1549         }
1550         kfree(tz->trip_type_attrs);
1551         kfree(tz->trip_temp_attrs);
1552         kfree(tz->trip_hyst_attrs);
1553 }
1554
1555 /**
1556  * thermal_zone_device_register - register a new thermal zone device
1557  * @type:       the thermal zone device type
1558  * @trips:      the number of trip points the thermal zone support
1559  * @mask:       a bit string indicating the writeablility of trip points
1560  * @devdata:    private device data
1561  * @ops:        standard thermal zone device callbacks
1562  * @tzp:        thermal zone platform parameters
1563  * @passive_delay: number of milliseconds to wait between polls when
1564  *                 performing passive cooling
1565  * @polling_delay: number of milliseconds to wait between polls when checking
1566  *                 whether trip points have been crossed (0 for interrupt
1567  *                 driven systems)
1568  *
1569  * thermal_zone_device_unregister() must be called when the device is no
1570  * longer needed. The passive cooling depends on the .get_trend() return value.
1571  */
1572 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1573         int trips, int mask, void *devdata,
1574         const struct thermal_zone_device_ops *ops,
1575         const struct thermal_zone_params *tzp,
1576         int passive_delay, int polling_delay)
1577 {
1578         struct thermal_zone_device *tz;
1579         enum thermal_trip_type trip_type;
1580         int result;
1581         int count;
1582         int passive = 0;
1583
1584         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1585                 return ERR_PTR(-EINVAL);
1586
1587         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1588                 return ERR_PTR(-EINVAL);
1589
1590         if (!ops || !ops->get_temp)
1591                 return ERR_PTR(-EINVAL);
1592
1593         if (trips > 0 && !ops->get_trip_type)
1594                 return ERR_PTR(-EINVAL);
1595
1596         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1597         if (!tz)
1598                 return ERR_PTR(-ENOMEM);
1599
1600         INIT_LIST_HEAD(&tz->thermal_instances);
1601         idr_init(&tz->idr);
1602         mutex_init(&tz->lock);
1603         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1604         if (result) {
1605                 kfree(tz);
1606                 return ERR_PTR(result);
1607         }
1608
1609         strcpy(tz->type, type ? : "");
1610         tz->ops = ops;
1611         tz->tzp = tzp;
1612         tz->device.class = &thermal_class;
1613         tz->devdata = devdata;
1614         tz->trips = trips;
1615         tz->passive_delay = passive_delay;
1616         tz->polling_delay = polling_delay;
1617
1618         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1619         result = device_register(&tz->device);
1620         if (result) {
1621                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1622                 kfree(tz);
1623                 return ERR_PTR(result);
1624         }
1625
1626         /* sys I/F */
1627         if (type) {
1628                 result = device_create_file(&tz->device, &dev_attr_type);
1629                 if (result)
1630                         goto unregister;
1631         }
1632
1633         result = device_create_file(&tz->device, &dev_attr_temp);
1634         if (result)
1635                 goto unregister;
1636
1637         if (ops->get_mode) {
1638                 result = device_create_file(&tz->device, &dev_attr_mode);
1639                 if (result)
1640                         goto unregister;
1641         }
1642
1643         result = create_trip_attrs(tz, mask);
1644         if (result)
1645                 goto unregister;
1646
1647         for (count = 0; count < trips; count++) {
1648                 tz->ops->get_trip_type(tz, count, &trip_type);
1649                 if (trip_type == THERMAL_TRIP_PASSIVE)
1650                         passive = 1;
1651         }
1652
1653         if (!passive) {
1654                 result = device_create_file(&tz->device, &dev_attr_passive);
1655                 if (result)
1656                         goto unregister;
1657         }
1658
1659 #ifdef CONFIG_THERMAL_EMULATION
1660         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1661         if (result)
1662                 goto unregister;
1663 #endif
1664         /* Create policy attribute */
1665         result = device_create_file(&tz->device, &dev_attr_policy);
1666         if (result)
1667                 goto unregister;
1668
1669         /* Update 'this' zone's governor information */
1670         mutex_lock(&thermal_governor_lock);
1671
1672         if (tz->tzp)
1673                 tz->governor = __find_governor(tz->tzp->governor_name);
1674         else
1675                 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1676
1677         mutex_unlock(&thermal_governor_lock);
1678
1679         result = thermal_add_hwmon_sysfs(tz);
1680         if (result)
1681                 goto unregister;
1682
1683         mutex_lock(&thermal_list_lock);
1684         list_add_tail(&tz->node, &thermal_tz_list);
1685         mutex_unlock(&thermal_list_lock);
1686
1687         /* Bind cooling devices for this zone */
1688         bind_tz(tz);
1689
1690         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1691
1692         thermal_zone_device_update(tz);
1693
1694         if (!result)
1695                 return tz;
1696
1697 unregister:
1698         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1699         device_unregister(&tz->device);
1700         return ERR_PTR(result);
1701 }
1702 EXPORT_SYMBOL(thermal_zone_device_register);
1703
1704 /**
1705  * thermal_device_unregister - removes the registered thermal zone device
1706  * @tz: the thermal zone device to remove
1707  */
1708 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1709 {
1710         int i;
1711         const struct thermal_zone_params *tzp;
1712         struct thermal_cooling_device *cdev;
1713         struct thermal_zone_device *pos = NULL;
1714
1715         if (!tz)
1716                 return;
1717
1718         tzp = tz->tzp;
1719
1720         mutex_lock(&thermal_list_lock);
1721         list_for_each_entry(pos, &thermal_tz_list, node)
1722             if (pos == tz)
1723                 break;
1724         if (pos != tz) {
1725                 /* thermal zone device not found */
1726                 mutex_unlock(&thermal_list_lock);
1727                 return;
1728         }
1729         list_del(&tz->node);
1730
1731         /* Unbind all cdevs associated with 'this' thermal zone */
1732         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1733                 if (tz->ops->unbind) {
1734                         tz->ops->unbind(tz, cdev);
1735                         continue;
1736                 }
1737
1738                 if (!tzp || !tzp->tbp)
1739                         break;
1740
1741                 for (i = 0; i < tzp->num_tbps; i++) {
1742                         if (tzp->tbp[i].cdev == cdev) {
1743                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1744                                 tzp->tbp[i].cdev = NULL;
1745                         }
1746                 }
1747         }
1748
1749         mutex_unlock(&thermal_list_lock);
1750
1751         thermal_zone_device_set_polling(tz, 0);
1752
1753         if (tz->type[0])
1754                 device_remove_file(&tz->device, &dev_attr_type);
1755         device_remove_file(&tz->device, &dev_attr_temp);
1756         if (tz->ops->get_mode)
1757                 device_remove_file(&tz->device, &dev_attr_mode);
1758         device_remove_file(&tz->device, &dev_attr_policy);
1759         remove_trip_attrs(tz);
1760         tz->governor = NULL;
1761
1762         thermal_remove_hwmon_sysfs(tz);
1763         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1764         idr_destroy(&tz->idr);
1765         mutex_destroy(&tz->lock);
1766         device_unregister(&tz->device);
1767         return;
1768 }
1769 EXPORT_SYMBOL(thermal_zone_device_unregister);
1770
1771 /**
1772  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1773  * @name: thermal zone name to fetch the temperature
1774  *
1775  * When only one zone is found with the passed name, returns a reference to it.
1776  *
1777  * Return: On success returns a reference to an unique thermal zone with
1778  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1779  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1780  */
1781 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1782 {
1783         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1784         unsigned int found = 0;
1785
1786         if (!name)
1787                 goto exit;
1788
1789         mutex_lock(&thermal_list_lock);
1790         list_for_each_entry(pos, &thermal_tz_list, node)
1791                 if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1792                         found++;
1793                         ref = pos;
1794                 }
1795         mutex_unlock(&thermal_list_lock);
1796
1797         /* nothing has been found, thus an error code for it */
1798         if (found == 0)
1799                 ref = ERR_PTR(-ENODEV);
1800         else if (found > 1)
1801         /* Success only when an unique zone is found */
1802                 ref = ERR_PTR(-EEXIST);
1803
1804 exit:
1805         return ref;
1806 }
1807 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1808
1809 #ifdef CONFIG_NET
1810 static struct genl_family thermal_event_genl_family = {
1811         .id = GENL_ID_GENERATE,
1812         .name = THERMAL_GENL_FAMILY_NAME,
1813         .version = THERMAL_GENL_VERSION,
1814         .maxattr = THERMAL_GENL_ATTR_MAX,
1815 };
1816
1817 static struct genl_multicast_group thermal_event_mcgrp = {
1818         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1819 };
1820
1821 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1822                                         enum events event)
1823 {
1824         struct sk_buff *skb;
1825         struct nlattr *attr;
1826         struct thermal_genl_event *thermal_event;
1827         void *msg_header;
1828         int size;
1829         int result;
1830         static unsigned int thermal_event_seqnum;
1831
1832         if (!tz)
1833                 return -EINVAL;
1834
1835         /* allocate memory */
1836         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1837                nla_total_size(0);
1838
1839         skb = genlmsg_new(size, GFP_ATOMIC);
1840         if (!skb)
1841                 return -ENOMEM;
1842
1843         /* add the genetlink message header */
1844         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1845                                  &thermal_event_genl_family, 0,
1846                                  THERMAL_GENL_CMD_EVENT);
1847         if (!msg_header) {
1848                 nlmsg_free(skb);
1849                 return -ENOMEM;
1850         }
1851
1852         /* fill the data */
1853         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1854                            sizeof(struct thermal_genl_event));
1855
1856         if (!attr) {
1857                 nlmsg_free(skb);
1858                 return -EINVAL;
1859         }
1860
1861         thermal_event = nla_data(attr);
1862         if (!thermal_event) {
1863                 nlmsg_free(skb);
1864                 return -EINVAL;
1865         }
1866
1867         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1868
1869         thermal_event->orig = tz->id;
1870         thermal_event->event = event;
1871
1872         /* send multicast genetlink message */
1873         result = genlmsg_end(skb, msg_header);
1874         if (result < 0) {
1875                 nlmsg_free(skb);
1876                 return result;
1877         }
1878
1879         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1880         if (result)
1881                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1882
1883         return result;
1884 }
1885 EXPORT_SYMBOL(thermal_generate_netlink_event);
1886
1887 static int genetlink_init(void)
1888 {
1889         int result;
1890
1891         result = genl_register_family(&thermal_event_genl_family);
1892         if (result)
1893                 return result;
1894
1895         result = genl_register_mc_group(&thermal_event_genl_family,
1896                                         &thermal_event_mcgrp);
1897         if (result)
1898                 genl_unregister_family(&thermal_event_genl_family);
1899         return result;
1900 }
1901
1902 static void genetlink_exit(void)
1903 {
1904         genl_unregister_family(&thermal_event_genl_family);
1905 }
1906 #else /* !CONFIG_NET */
1907 static inline int genetlink_init(void) { return 0; }
1908 static inline void genetlink_exit(void) {}
1909 #endif /* !CONFIG_NET */
1910
1911 static int __init thermal_register_governors(void)
1912 {
1913         int result;
1914
1915         result = thermal_gov_step_wise_register();
1916         if (result)
1917                 return result;
1918
1919         result = thermal_gov_fair_share_register();
1920         if (result)
1921                 return result;
1922
1923         return thermal_gov_user_space_register();
1924 }
1925
1926 static void thermal_unregister_governors(void)
1927 {
1928         thermal_gov_step_wise_unregister();
1929         thermal_gov_fair_share_unregister();
1930         thermal_gov_user_space_unregister();
1931 }
1932
1933 static int __init thermal_init(void)
1934 {
1935         int result;
1936
1937         result = thermal_register_governors();
1938         if (result)
1939                 goto error;
1940
1941         result = class_register(&thermal_class);
1942         if (result)
1943                 goto unregister_governors;
1944
1945         result = genetlink_init();
1946         if (result)
1947                 goto unregister_class;
1948
1949         return 0;
1950
1951 unregister_governors:
1952         thermal_unregister_governors();
1953 unregister_class:
1954         class_unregister(&thermal_class);
1955 error:
1956         idr_destroy(&thermal_tz_idr);
1957         idr_destroy(&thermal_cdev_idr);
1958         mutex_destroy(&thermal_idr_lock);
1959         mutex_destroy(&thermal_list_lock);
1960         mutex_destroy(&thermal_governor_lock);
1961         return result;
1962 }
1963
1964 static void __exit thermal_exit(void)
1965 {
1966         genetlink_exit();
1967         class_unregister(&thermal_class);
1968         thermal_unregister_governors();
1969         idr_destroy(&thermal_tz_idr);
1970         idr_destroy(&thermal_cdev_idr);
1971         mutex_destroy(&thermal_idr_lock);
1972         mutex_destroy(&thermal_list_lock);
1973         mutex_destroy(&thermal_governor_lock);
1974 }
1975
1976 fs_initcall(thermal_init);
1977 module_exit(thermal_exit);