drivers/thermal/thermal_core.c

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