drivers/thermal/thermal_core.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/reboot.h>
  36 #include <linux/string.h>
  37 #include <linux/of.h>
  38 #include <net/netlink.h>
  39 #include <net/genetlink.h>
  40
  41 #include "thermal_core.h"
  42 #include "thermal_hwmon.h"
  43
  44 MODULE_AUTHOR("Zhang Rui");
  45 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  46 MODULE_LICENSE("GPL v2");
  47
  48 static DEFINE_IDR(thermal_tz_idr);
  49 static DEFINE_IDR(thermal_cdev_idr);
  50 static DEFINE_MUTEX(thermal_idr_lock);
  51
  52 static LIST_HEAD(thermal_tz_list);
  53 static LIST_HEAD(thermal_cdev_list);
  54 static LIST_HEAD(thermal_governor_list);
  55
  56 static DEFINE_MUTEX(thermal_list_lock);
  57 static DEFINE_MUTEX(thermal_governor_lock);
  58
  59 static struct thermal_governor *def_governor;
  60
  61 static struct thermal_governor *__find_governor(const char *name)
  62 {
  63         struct thermal_governor *pos;
  64
  65         if (!name || !name[0])
  66                 return def_governor;
  67
  68         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  69                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  70                         return pos;
  71
  72         return NULL;
  73 }
  74
  75 int thermal_register_governor(struct thermal_governor *governor)
  76 {
  77         int err;
  78         const char *name;
  79         struct thermal_zone_device *pos;
  80
  81         if (!governor)
  82                 return -EINVAL;
  83
  84         mutex_lock(&thermal_governor_lock);
  85
  86         err = -EBUSY;
  87         if (__find_governor(governor->name) == NULL) {
  88                 err = 0;
  89                 list_add(&governor->governor_list, &thermal_governor_list);
  90                 if (!def_governor && !strncmp(governor->name,
  91                         DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
  92                         def_governor = governor;
  93         }
  94
  95         mutex_lock(&thermal_list_lock);
  96
  97         list_for_each_entry(pos, &thermal_tz_list, node) {
  98                 /*
  99                  * only thermal zones with specified tz->tzp->governor_name
 100                  * may run with tz->govenor unset
 101                  */
 102                 if (pos->governor)
 103                         continue;
 104
 105                 name = pos->tzp->governor_name;
 106
 107                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH))
 108                         pos->governor = governor;
 109         }
 110
 111         mutex_unlock(&thermal_list_lock);
 112         mutex_unlock(&thermal_governor_lock);
 113
 114         return err;
 115 }
 116
 117 void thermal_unregister_governor(struct thermal_governor *governor)
 118 {
 119         struct thermal_zone_device *pos;
 120
 121         if (!governor)
 122                 return;
 123
 124         mutex_lock(&thermal_governor_lock);
 125
 126         if (__find_governor(governor->name) == NULL)
 127                 goto exit;
 128
 129         mutex_lock(&thermal_list_lock);
 130
 131         list_for_each_entry(pos, &thermal_tz_list, node) {
 132                 if (!strncasecmp(pos->governor->name, governor->name,
 133                                                 THERMAL_NAME_LENGTH))
 134                         pos->governor = NULL;
 135         }
 136
 137         mutex_unlock(&thermal_list_lock);
 138         list_del(&governor->governor_list);
 139 exit:
 140         mutex_unlock(&thermal_governor_lock);
 141         return;
 142 }
 143
 144 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 145 {
 146         int ret;
 147
 148         if (lock)
 149                 mutex_lock(lock);
 150         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 151         if (lock)
 152                 mutex_unlock(lock);
 153         if (unlikely(ret < 0))
 154                 return ret;
 155         *id = ret;
 156         return 0;
 157 }
 158
 159 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 160 {
 161         if (lock)
 162                 mutex_lock(lock);
 163         idr_remove(idr, id);
 164         if (lock)
 165                 mutex_unlock(lock);
 166 }
 167
 168 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 169 {
 170         enum thermal_trend trend;
 171
 172         if (tz->emul_temperature || !tz->ops->get_trend ||
 173             tz->ops->get_trend(tz, trip, &trend)) {
 174                 if (tz->temperature > tz->last_temperature)
 175                         trend = THERMAL_TREND_RAISING;
 176                 else if (tz->temperature < tz->last_temperature)
 177                         trend = THERMAL_TREND_DROPPING;
 178                 else
 179                         trend = THERMAL_TREND_STABLE;
 180         }
 181
 182         return trend;
 183 }
 184 EXPORT_SYMBOL(get_tz_trend);
 185
 186 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 187                         struct thermal_cooling_device *cdev, int trip)
 188 {
 189         struct thermal_instance *pos = NULL;
 190         struct thermal_instance *target_instance = NULL;
 191
 192         mutex_lock(&tz->lock);
 193         mutex_lock(&cdev->lock);
 194
 195         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 196                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 197                         target_instance = pos;
 198                         break;
 199                 }
 200         }
 201
 202         mutex_unlock(&cdev->lock);
 203         mutex_unlock(&tz->lock);
 204
 205         return target_instance;
 206 }
 207 EXPORT_SYMBOL(get_thermal_instance);
 208
 209 static void print_bind_err_msg(struct thermal_zone_device *tz,
 210                         struct thermal_cooling_device *cdev, int ret)
 211 {
 212         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 213                                 tz->type, cdev->type, ret);
 214 }
 215
 216 static void __bind(struct thermal_zone_device *tz, int mask,
 217                         struct thermal_cooling_device *cdev,
 218                         unsigned long *limits)
 219 {
 220         int i, ret;
 221
 222         for (i = 0; i < tz->trips; i++) {
 223                 if (mask & (1 << i)) {
 224                         unsigned long upper, lower;
 225
 226                         upper = THERMAL_NO_LIMIT;
 227                         lower = THERMAL_NO_LIMIT;
 228                         if (limits) {
 229                                 lower = limits[i * 2];
 230                                 upper = limits[i * 2 + 1];
 231                         }
 232                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 233                                                                upper, lower);
 234                         if (ret)
 235                                 print_bind_err_msg(tz, cdev, ret);
 236                 }
 237         }
 238 }
 239
 240 static void __unbind(struct thermal_zone_device *tz, int mask,
 241                         struct thermal_cooling_device *cdev)
 242 {
 243         int i;
 244
 245         for (i = 0; i < tz->trips; i++)
 246                 if (mask & (1 << i))
 247                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 248 }
 249
 250 static void bind_cdev(struct thermal_cooling_device *cdev)
 251 {
 252         int i, ret;
 253         const struct thermal_zone_params *tzp;
 254         struct thermal_zone_device *pos = NULL;
 255
 256         mutex_lock(&thermal_list_lock);
 257
 258         list_for_each_entry(pos, &thermal_tz_list, node) {
 259                 if (!pos->tzp && !pos->ops->bind)
 260                         continue;
 261
 262                 if (pos->ops->bind) {
 263                         ret = pos->ops->bind(pos, cdev);
 264                         if (ret)
 265                                 print_bind_err_msg(pos, cdev, ret);
 266                         continue;
 267                 }
 268
 269                 tzp = pos->tzp;
 270                 if (!tzp || !tzp->tbp)
 271                         continue;
 272
 273                 for (i = 0; i < tzp->num_tbps; i++) {
 274                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 275                                 continue;
 276                         if (tzp->tbp[i].match(pos, cdev))
 277                                 continue;
 278                         tzp->tbp[i].cdev = cdev;
 279                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 280                                tzp->tbp[i].binding_limits);
 281                 }
 282         }
 283
 284         mutex_unlock(&thermal_list_lock);
 285 }
 286
 287 static void bind_tz(struct thermal_zone_device *tz)
 288 {
 289         int i, ret;
 290         struct thermal_cooling_device *pos = NULL;
 291         const struct thermal_zone_params *tzp = tz->tzp;
 292
 293         if (!tzp && !tz->ops->bind)
 294                 return;
 295
 296         mutex_lock(&thermal_list_lock);
 297
 298         /* If there is ops->bind, try to use ops->bind */
 299         if (tz->ops->bind) {
 300                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 301                         ret = tz->ops->bind(tz, pos);
 302                         if (ret)
 303                                 print_bind_err_msg(tz, pos, ret);
 304                 }
 305                 goto exit;
 306         }
 307
 308         if (!tzp || !tzp->tbp)
 309                 goto exit;
 310
 311         list_for_each_entry(pos, &thermal_cdev_list, node) {
 312                 for (i = 0; i < tzp->num_tbps; i++) {
 313                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 314                                 continue;
 315                         if (tzp->tbp[i].match(tz, pos))
 316                                 continue;
 317                         tzp->tbp[i].cdev = pos;
 318                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 319                                tzp->tbp[i].binding_limits);
 320                 }
 321         }
 322 exit:
 323         mutex_unlock(&thermal_list_lock);
 324 }
 325
 326 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 327                                             int delay)
 328 {
 329         if (delay > 1000)
 330                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 331                                  round_jiffies(msecs_to_jiffies(delay)));
 332         else if (delay)
 333                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 334                                  msecs_to_jiffies(delay));
 335         else
 336                 cancel_delayed_work(&tz->poll_queue);
 337 }
 338
 339 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 340 {
 341         mutex_lock(&tz->lock);
 342
 343         if (tz->passive)
 344                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 345         else if (tz->polling_delay)
 346                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 347         else
 348                 thermal_zone_device_set_polling(tz, 0);
 349
 350         mutex_unlock(&tz->lock);
 351 }
 352
 353 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 354                         int trip, enum thermal_trip_type trip_type)
 355 {
 356         tz->governor ? tz->governor->throttle(tz, trip) :
 357                        def_governor->throttle(tz, trip);
 358 }
 359
 360 static void handle_critical_trips(struct thermal_zone_device *tz,
 361                                 int trip, enum thermal_trip_type trip_type)
 362 {
 363         long trip_temp;
 364
 365         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 366
 367         /* If we have not crossed the trip_temp, we do not care. */
 368         if (tz->temperature < trip_temp)
 369                 return;
 370
 371         if (tz->ops->notify)
 372                 tz->ops->notify(tz, trip, trip_type);
 373
 374         if (trip_type == THERMAL_TRIP_CRITICAL) {
 375                 dev_emerg(&tz->device,
 376                           "critical temperature reached(%d C),shutting down\n",
 377                           tz->temperature / 1000);
 378                 orderly_poweroff(true);
 379         }
 380 }
 381
 382 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 383 {
 384         enum thermal_trip_type type;
 385
 386         tz->ops->get_trip_type(tz, trip, &type);
 387
 388         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 389                 handle_critical_trips(tz, trip, type);
 390         else
 391                 handle_non_critical_trips(tz, trip, type);
 392         /*
 393          * Alright, we handled this trip successfully.
 394          * So, start monitoring again.
 395          */
 396         monitor_thermal_zone(tz);
 397 }
 398
 399 /**
 400  * thermal_zone_get_temp() - returns its the temperature of thermal zone
 401  * @tz: a valid pointer to a struct thermal_zone_device
 402  * @temp: a valid pointer to where to store the resulting temperature.
 403  *
 404  * When a valid thermal zone reference is passed, it will fetch its
 405  * temperature and fill @temp.
 406  *
 407  * Return: On success returns 0, an error code otherwise
 408  */
 409 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 410 {
 411         int ret = -EINVAL;
 412 #ifdef CONFIG_THERMAL_EMULATION
 413         int count;
 414         unsigned long crit_temp = -1UL;
 415         enum thermal_trip_type type;
 416 #endif
 417
 418         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 419                 goto exit;
 420
 421         mutex_lock(&tz->lock);
 422
 423         ret = tz->ops->get_temp(tz, temp);
 424 #ifdef CONFIG_THERMAL_EMULATION
 425         if (!tz->emul_temperature)
 426                 goto skip_emul;
 427
 428         for (count = 0; count < tz->trips; count++) {
 429                 ret = tz->ops->get_trip_type(tz, count, &type);
 430                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 431                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 432                         break;
 433                 }
 434         }
 435
 436         if (ret)
 437                 goto skip_emul;
 438
 439         if (*temp < crit_temp)
 440                 *temp = tz->emul_temperature;
 441 skip_emul:
 442 #endif
 443         mutex_unlock(&tz->lock);
 444 exit:
 445         return ret;
 446 }
 447 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 448
 449 static void update_temperature(struct thermal_zone_device *tz)
 450 {
 451         long temp;
 452         int ret;
 453
 454         ret = thermal_zone_get_temp(tz, &temp);
 455         if (ret) {
 456                 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
 457                          tz->id);
 458                 return;
 459         }
 460
 461         mutex_lock(&tz->lock);
 462         tz->last_temperature = tz->temperature;
 463         tz->temperature = temp;
 464         mutex_unlock(&tz->lock);
 465
 466         dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 467                                 tz->last_temperature, tz->temperature);
 468 }
 469
 470 void thermal_zone_device_update(struct thermal_zone_device *tz)
 471 {
 472         int count;
 473
 474         if (!tz->ops->get_temp)
 475                 return;
 476
 477         update_temperature(tz);
 478
 479         for (count = 0; count < tz->trips; count++)
 480                 handle_thermal_trip(tz, count);
 481 }
 482 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 483
 484 static void thermal_zone_device_check(struct work_struct *work)
 485 {
 486         struct thermal_zone_device *tz = container_of(work, struct
 487                                                       thermal_zone_device,
 488                                                       poll_queue.work);
 489         thermal_zone_device_update(tz);
 490 }
 491
 492 /* sys I/F for thermal zone */
 493
 494 #define to_thermal_zone(_dev) \
 495         container_of(_dev, struct thermal_zone_device, device)
 496
 497 static ssize_t
 498 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 499 {
 500         struct thermal_zone_device *tz = to_thermal_zone(dev);
 501
 502         return sprintf(buf, "%s\n", tz->type);
 503 }
 504
 505 static ssize_t
 506 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 507 {
 508         struct thermal_zone_device *tz = to_thermal_zone(dev);
 509         long temperature;
 510         int ret;
 511
 512         ret = thermal_zone_get_temp(tz, &temperature);
 513
 514         if (ret)
 515                 return ret;
 516
 517         return sprintf(buf, "%ld\n", temperature);
 518 }
 519
 520 static ssize_t
 521 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 522 {
 523         struct thermal_zone_device *tz = to_thermal_zone(dev);
 524         enum thermal_device_mode mode;
 525         int result;
 526
 527         if (!tz->ops->get_mode)
 528                 return -EPERM;
 529
 530         result = tz->ops->get_mode(tz, &mode);
 531         if (result)
 532                 return result;
 533
 534         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 535                        : "disabled");
 536 }
 537
 538 static ssize_t
 539 mode_store(struct device *dev, struct device_attribute *attr,
 540            const char *buf, size_t count)
 541 {
 542         struct thermal_zone_device *tz = to_thermal_zone(dev);
 543         int result;
 544
 545         if (!tz->ops->set_mode)
 546                 return -EPERM;
 547
 548         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 549                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 550         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 551                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 552         else
 553                 result = -EINVAL;
 554
 555         if (result)
 556                 return result;
 557
 558         return count;
 559 }
 560
 561 static ssize_t
 562 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 563                      char *buf)
 564 {
 565         struct thermal_zone_device *tz = to_thermal_zone(dev);
 566         enum thermal_trip_type type;
 567         int trip, result;
 568
 569         if (!tz->ops->get_trip_type)
 570                 return -EPERM;
 571
 572         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 573                 return -EINVAL;
 574
 575         result = tz->ops->get_trip_type(tz, trip, &type);
 576         if (result)
 577                 return result;
 578
 579         switch (type) {
 580         case THERMAL_TRIP_CRITICAL:
 581                 return sprintf(buf, "critical\n");
 582         case THERMAL_TRIP_HOT:
 583                 return sprintf(buf, "hot\n");
 584         case THERMAL_TRIP_PASSIVE:
 585                 return sprintf(buf, "passive\n");
 586         case THERMAL_TRIP_ACTIVE:
 587                 return sprintf(buf, "active\n");
 588         default:
 589                 return sprintf(buf, "unknown\n");
 590         }
 591 }
 592
 593 static ssize_t
 594 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 595                      const char *buf, size_t count)
 596 {
 597         struct thermal_zone_device *tz = to_thermal_zone(dev);
 598         int trip, ret;
 599         unsigned long temperature;
 600
 601         if (!tz->ops->set_trip_temp)
 602                 return -EPERM;
 603
 604         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 605                 return -EINVAL;
 606
 607         if (kstrtoul(buf, 10, &temperature))
 608                 return -EINVAL;
 609
 610         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 611
 612         return ret ? ret : count;
 613 }
 614
 615 static ssize_t
 616 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 617                      char *buf)
 618 {
 619         struct thermal_zone_device *tz = to_thermal_zone(dev);
 620         int trip, ret;
 621         long temperature;
 622
 623         if (!tz->ops->get_trip_temp)
 624                 return -EPERM;
 625
 626         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 627                 return -EINVAL;
 628
 629         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 630
 631         if (ret)
 632                 return ret;
 633
 634         return sprintf(buf, "%ld\n", temperature);
 635 }
 636
 637 static ssize_t
 638 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 639                         const char *buf, size_t count)
 640 {
 641         struct thermal_zone_device *tz = to_thermal_zone(dev);
 642         int trip, ret;
 643         unsigned long temperature;
 644
 645         if (!tz->ops->set_trip_hyst)
 646                 return -EPERM;
 647
 648         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 649                 return -EINVAL;
 650
 651         if (kstrtoul(buf, 10, &temperature))
 652                 return -EINVAL;
 653
 654         /*
 655          * We are not doing any check on the 'temperature' value
 656          * here. The driver implementing 'set_trip_hyst' has to
 657          * take care of this.
 658          */
 659         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 660
 661         return ret ? ret : count;
 662 }
 663
 664 static ssize_t
 665 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 666                         char *buf)
 667 {
 668         struct thermal_zone_device *tz = to_thermal_zone(dev);
 669         int trip, ret;
 670         unsigned long temperature;
 671
 672         if (!tz->ops->get_trip_hyst)
 673                 return -EPERM;
 674
 675         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 676                 return -EINVAL;
 677
 678         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 679
 680         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 681 }
 682
 683 static ssize_t
 684 passive_store(struct device *dev, struct device_attribute *attr,
 685                     const char *buf, size_t count)
 686 {
 687         struct thermal_zone_device *tz = to_thermal_zone(dev);
 688         struct thermal_cooling_device *cdev = NULL;
 689         int state;
 690
 691         if (!sscanf(buf, "%d\n", &state))
 692                 return -EINVAL;
 693
 694         /* sanity check: values below 1000 millicelcius don't make sense
 695          * and can cause the system to go into a thermal heart attack
 696          */
 697         if (state && state < 1000)
 698                 return -EINVAL;
 699
 700         if (state && !tz->forced_passive) {
 701                 mutex_lock(&thermal_list_lock);
 702                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 703                         if (!strncmp("Processor", cdev->type,
 704                                      sizeof("Processor")))
 705                                 thermal_zone_bind_cooling_device(tz,
 706                                                 THERMAL_TRIPS_NONE, cdev,
 707                                                 THERMAL_NO_LIMIT,
 708                                                 THERMAL_NO_LIMIT);
 709                 }
 710                 mutex_unlock(&thermal_list_lock);
 711                 if (!tz->passive_delay)
 712                         tz->passive_delay = 1000;
 713         } else if (!state && tz->forced_passive) {
 714                 mutex_lock(&thermal_list_lock);
 715                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 716                         if (!strncmp("Processor", cdev->type,
 717                                      sizeof("Processor")))
 718                                 thermal_zone_unbind_cooling_device(tz,
 719                                                                    THERMAL_TRIPS_NONE,
 720                                                                    cdev);
 721                 }
 722                 mutex_unlock(&thermal_list_lock);
 723                 tz->passive_delay = 0;
 724         }
 725
 726         tz->forced_passive = state;
 727
 728         thermal_zone_device_update(tz);
 729
 730         return count;
 731 }
 732
 733 static ssize_t
 734 passive_show(struct device *dev, struct device_attribute *attr,
 735                    char *buf)
 736 {
 737         struct thermal_zone_device *tz = to_thermal_zone(dev);
 738
 739         return sprintf(buf, "%d\n", tz->forced_passive);
 740 }
 741
 742 static ssize_t
 743 policy_store(struct device *dev, struct device_attribute *attr,
 744                     const char *buf, size_t count)
 745 {
 746         int ret = -EINVAL;
 747         struct thermal_zone_device *tz = to_thermal_zone(dev);
 748         struct thermal_governor *gov;
 749         char name[THERMAL_NAME_LENGTH];
 750
 751         snprintf(name, sizeof(name), "%s", buf);
 752
 753         mutex_lock(&thermal_governor_lock);
 754
 755         gov = __find_governor(strim(name));
 756         if (!gov)
 757                 goto exit;
 758
 759         tz->governor = gov;
 760         ret = count;
 761
 762 exit:
 763         mutex_unlock(&thermal_governor_lock);
 764         return ret;
 765 }
 766
 767 static ssize_t
 768 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 769 {
 770         struct thermal_zone_device *tz = to_thermal_zone(dev);
 771
 772         return sprintf(buf, "%s\n", tz->governor->name);
 773 }
 774
 775 #ifdef CONFIG_THERMAL_EMULATION
 776 static ssize_t
 777 emul_temp_store(struct device *dev, struct device_attribute *attr,
 778                      const char *buf, size_t count)
 779 {
 780         struct thermal_zone_device *tz = to_thermal_zone(dev);
 781         int ret = 0;
 782         unsigned long temperature;
 783
 784         if (kstrtoul(buf, 10, &temperature))
 785                 return -EINVAL;
 786
 787         if (!tz->ops->set_emul_temp) {
 788                 mutex_lock(&tz->lock);
 789                 tz->emul_temperature = temperature;
 790                 mutex_unlock(&tz->lock);
 791         } else {
 792                 ret = tz->ops->set_emul_temp(tz, temperature);
 793         }
 794
 795         if (!ret)
 796                 thermal_zone_device_update(tz);
 797
 798         return ret ? ret : count;
 799 }
 800 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 801 #endif/*CONFIG_THERMAL_EMULATION*/
 802
 803 static DEVICE_ATTR(type, 0444, type_show, NULL);
 804 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 805 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 806 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 807 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 808
 809 /* sys I/F for cooling device */
 810 #define to_cooling_device(_dev) \
 811         container_of(_dev, struct thermal_cooling_device, device)
 812
 813 static ssize_t
 814 thermal_cooling_device_type_show(struct device *dev,
 815                                  struct device_attribute *attr, char *buf)
 816 {
 817         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 818
 819         return sprintf(buf, "%s\n", cdev->type);
 820 }
 821
 822 static ssize_t
 823 thermal_cooling_device_max_state_show(struct device *dev,
 824                                       struct device_attribute *attr, char *buf)
 825 {
 826         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 827         unsigned long state;
 828         int ret;
 829
 830         ret = cdev->ops->get_max_state(cdev, &state);
 831         if (ret)
 832                 return ret;
 833         return sprintf(buf, "%ld\n", state);
 834 }
 835
 836 static ssize_t
 837 thermal_cooling_device_cur_state_show(struct device *dev,
 838                                       struct device_attribute *attr, char *buf)
 839 {
 840         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 841         unsigned long state;
 842         int ret;
 843
 844         ret = cdev->ops->get_cur_state(cdev, &state);
 845         if (ret)
 846                 return ret;
 847         return sprintf(buf, "%ld\n", state);
 848 }
 849
 850 static ssize_t
 851 thermal_cooling_device_cur_state_store(struct device *dev,
 852                                        struct device_attribute *attr,
 853                                        const char *buf, size_t count)
 854 {
 855         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 856         unsigned long state;
 857         int result;
 858
 859         if (!sscanf(buf, "%ld\n", &state))
 860                 return -EINVAL;
 861
 862         if ((long)state < 0)
 863                 return -EINVAL;
 864
 865         result = cdev->ops->set_cur_state(cdev, state);
 866         if (result)
 867                 return result;
 868         return count;
 869 }
 870
 871 static struct device_attribute dev_attr_cdev_type =
 872 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 873 static DEVICE_ATTR(max_state, 0444,
 874                    thermal_cooling_device_max_state_show, NULL);
 875 static DEVICE_ATTR(cur_state, 0644,
 876                    thermal_cooling_device_cur_state_show,
 877                    thermal_cooling_device_cur_state_store);
 878
 879 static ssize_t
 880 thermal_cooling_device_trip_point_show(struct device *dev,
 881                                        struct device_attribute *attr, char *buf)
 882 {
 883         struct thermal_instance *instance;
 884
 885         instance =
 886             container_of(attr, struct thermal_instance, attr);
 887
 888         if (instance->trip == THERMAL_TRIPS_NONE)
 889                 return sprintf(buf, "-1\n");
 890         else
 891                 return sprintf(buf, "%d\n", instance->trip);
 892 }
 893
 894 /* Device management */
 895
 896 /**
 897  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
 898  * @tz:         pointer to struct thermal_zone_device
 899  * @trip:       indicates which trip point the cooling devices is
 900  *              associated with in this thermal zone.
 901  * @cdev:       pointer to struct thermal_cooling_device
 902  * @upper:      the Maximum cooling state for this trip point.
 903  *              THERMAL_NO_LIMIT means no upper limit,
 904  *              and the cooling device can be in max_state.
 905  * @lower:      the Minimum cooling state can be used for this trip point.
 906  *              THERMAL_NO_LIMIT means no lower limit,
 907  *              and the cooling device can be in cooling state 0.
 908  *
 909  * This interface function bind a thermal cooling device to the certain trip
 910  * point of a thermal zone device.
 911  * This function is usually called in the thermal zone device .bind callback.
 912  *
 913  * Return: 0 on success, the proper error value otherwise.
 914  */
 915 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 916                                      int trip,
 917                                      struct thermal_cooling_device *cdev,
 918                                      unsigned long upper, unsigned long lower)
 919 {
 920         struct thermal_instance *dev;
 921         struct thermal_instance *pos;
 922         struct thermal_zone_device *pos1;
 923         struct thermal_cooling_device *pos2;
 924         unsigned long max_state;
 925         int result;
 926
 927         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 928                 return -EINVAL;
 929
 930         list_for_each_entry(pos1, &thermal_tz_list, node) {
 931                 if (pos1 == tz)
 932                         break;
 933         }
 934         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 935                 if (pos2 == cdev)
 936                         break;
 937         }
 938
 939         if (tz != pos1 || cdev != pos2)
 940                 return -EINVAL;
 941
 942         cdev->ops->get_max_state(cdev, &max_state);
 943
 944         /* lower default 0, upper default max_state */
 945         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 946         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 947
 948         if (lower > upper || upper > max_state)
 949                 return -EINVAL;
 950
 951         dev =
 952             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 953         if (!dev)
 954                 return -ENOMEM;
 955         dev->tz = tz;
 956         dev->cdev = cdev;
 957         dev->trip = trip;
 958         dev->upper = upper;
 959         dev->lower = lower;
 960         dev->target = THERMAL_NO_TARGET;
 961
 962         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 963         if (result)
 964                 goto free_mem;
 965
 966         sprintf(dev->name, "cdev%d", dev->id);
 967         result =
 968             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 969         if (result)
 970                 goto release_idr;
 971
 972         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 973         sysfs_attr_init(&dev->attr.attr);
 974         dev->attr.attr.name = dev->attr_name;
 975         dev->attr.attr.mode = 0444;
 976         dev->attr.show = thermal_cooling_device_trip_point_show;
 977         result = device_create_file(&tz->device, &dev->attr);
 978         if (result)
 979                 goto remove_symbol_link;
 980
 981         mutex_lock(&tz->lock);
 982         mutex_lock(&cdev->lock);
 983         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 984             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 985                 result = -EEXIST;
 986                 break;
 987         }
 988         if (!result) {
 989                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 990                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 991         }
 992         mutex_unlock(&cdev->lock);
 993         mutex_unlock(&tz->lock);
 994
 995         if (!result)
 996                 return 0;
 997
 998         device_remove_file(&tz->device, &dev->attr);
 999 remove_symbol_link:
1000         sysfs_remove_link(&tz->device.kobj, dev->name);
1001 release_idr:
1002         release_idr(&tz->idr, &tz->lock, dev->id);
1003 free_mem:
1004         kfree(dev);
1005         return result;
1006 }
1007 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1008
1009 /**
1010  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1011  *                                        thermal zone.
1012  * @tz:         pointer to a struct thermal_zone_device.
1013  * @trip:       indicates which trip point the cooling devices is
1014  *              associated with in this thermal zone.
1015  * @cdev:       pointer to a struct thermal_cooling_device.
1016  *
1017  * This interface function unbind a thermal cooling device from the certain
1018  * trip point of a thermal zone device.
1019  * This function is usually called in the thermal zone device .unbind callback.
1020  *
1021  * Return: 0 on success, the proper error value otherwise.
1022  */
1023 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1024                                        int trip,
1025                                        struct thermal_cooling_device *cdev)
1026 {
1027         struct thermal_instance *pos, *next;
1028
1029         mutex_lock(&tz->lock);
1030         mutex_lock(&cdev->lock);
1031         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1032                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1033                         list_del(&pos->tz_node);
1034                         list_del(&pos->cdev_node);
1035                         mutex_unlock(&cdev->lock);
1036                         mutex_unlock(&tz->lock);
1037                         goto unbind;
1038                 }
1039         }
1040         mutex_unlock(&cdev->lock);
1041         mutex_unlock(&tz->lock);
1042
1043         return -ENODEV;
1044
1045 unbind:
1046         device_remove_file(&tz->device, &pos->attr);
1047         sysfs_remove_link(&tz->device.kobj, pos->name);
1048         release_idr(&tz->idr, &tz->lock, pos->id);
1049         kfree(pos);
1050         return 0;
1051 }
1052 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1053
1054 static void thermal_release(struct device *dev)
1055 {
1056         struct thermal_zone_device *tz;
1057         struct thermal_cooling_device *cdev;
1058
1059         if (!strncmp(dev_name(dev), "thermal_zone",
1060                      sizeof("thermal_zone") - 1)) {
1061                 tz = to_thermal_zone(dev);
1062                 kfree(tz);
1063         } else if(!strncmp(dev_name(dev), "cooling_device",
1064                         sizeof("cooling_device") - 1)){
1065                 cdev = to_cooling_device(dev);
1066                 kfree(cdev);
1067         }
1068 }
1069
1070 static struct class thermal_class = {
1071         .name = "thermal",
1072         .dev_release = thermal_release,
1073 };
1074
1075 /**
1076  * __thermal_cooling_device_register() - register a new thermal cooling device
1077  * @np:         a pointer to a device tree node.
1078  * @type:       the thermal cooling device type.
1079  * @devdata:    device private data.
1080  * @ops:                standard thermal cooling devices callbacks.
1081  *
1082  * This interface function adds a new thermal cooling device (fan/processor/...)
1083  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1084  * to all the thermal zone devices registered at the same time.
1085  * It also gives the opportunity to link the cooling device to a device tree
1086  * node, so that it can be bound to a thermal zone created out of device tree.
1087  *
1088  * Return: a pointer to the created struct thermal_cooling_device or an
1089  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1090  */
1091 static struct thermal_cooling_device *
1092 __thermal_cooling_device_register(struct device_node *np,
1093                                   char *type, void *devdata,
1094                                   const struct thermal_cooling_device_ops *ops)
1095 {
1096         struct thermal_cooling_device *cdev;
1097         int result;
1098
1099         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1100                 return ERR_PTR(-EINVAL);
1101
1102         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1103             !ops->set_cur_state)
1104                 return ERR_PTR(-EINVAL);
1105
1106         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1107         if (!cdev)
1108                 return ERR_PTR(-ENOMEM);
1109
1110         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1111         if (result) {
1112                 kfree(cdev);
1113                 return ERR_PTR(result);
1114         }
1115
1116         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1117         mutex_init(&cdev->lock);
1118         INIT_LIST_HEAD(&cdev->thermal_instances);
1119         cdev->np = np;
1120         cdev->ops = ops;
1121         cdev->updated = false;
1122         cdev->device.class = &thermal_class;
1123         cdev->devdata = devdata;
1124         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1125         result = device_register(&cdev->device);
1126         if (result) {
1127                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1128                 kfree(cdev);
1129                 return ERR_PTR(result);
1130         }
1131
1132         /* sys I/F */
1133         if (type) {
1134                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1135                 if (result)
1136                         goto unregister;
1137         }
1138
1139         result = device_create_file(&cdev->device, &dev_attr_max_state);
1140         if (result)
1141                 goto unregister;
1142
1143         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1144         if (result)
1145                 goto unregister;
1146
1147         /* Add 'this' new cdev to the global cdev list */
1148         mutex_lock(&thermal_list_lock);
1149         list_add(&cdev->node, &thermal_cdev_list);
1150         mutex_unlock(&thermal_list_lock);
1151
1152         /* Update binding information for 'this' new cdev */
1153         bind_cdev(cdev);
1154
1155         return cdev;
1156
1157 unregister:
1158         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1159         device_unregister(&cdev->device);
1160         return ERR_PTR(result);
1161 }
1162
1163 /**
1164  * thermal_cooling_device_register() - register a new thermal cooling device
1165  * @type:       the thermal cooling device type.
1166  * @devdata:    device private data.
1167  * @ops:                standard thermal cooling devices callbacks.
1168  *
1169  * This interface function adds a new thermal cooling device (fan/processor/...)
1170  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1171  * to all the thermal zone devices registered at the same time.
1172  *
1173  * Return: a pointer to the created struct thermal_cooling_device or an
1174  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1175  */
1176 struct thermal_cooling_device *
1177 thermal_cooling_device_register(char *type, void *devdata,
1178                                 const struct thermal_cooling_device_ops *ops)
1179 {
1180         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1181 }
1182 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1183
1184 /**
1185  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1186  * @np:         a pointer to a device tree node.
1187  * @type:       the thermal cooling device type.
1188  * @devdata:    device private data.
1189  * @ops:                standard thermal cooling devices callbacks.
1190  *
1191  * This function will register a cooling device with device tree node reference.
1192  * This interface function adds a new thermal cooling device (fan/processor/...)
1193  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1194  * to all the thermal zone devices registered at the same time.
1195  *
1196  * Return: a pointer to the created struct thermal_cooling_device or an
1197  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1198  */
1199 struct thermal_cooling_device *
1200 thermal_of_cooling_device_register(struct device_node *np,
1201                                    char *type, void *devdata,
1202                                    const struct thermal_cooling_device_ops *ops)
1203 {
1204         return __thermal_cooling_device_register(np, type, devdata, ops);
1205 }
1206 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1207
1208 /**
1209  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1210  * @cdev:       the thermal cooling device to remove.
1211  *
1212  * thermal_cooling_device_unregister() must be called when the device is no
1213  * longer needed.
1214  */
1215 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1216 {
1217         int i;
1218         const struct thermal_zone_params *tzp;
1219         struct thermal_zone_device *tz;
1220         struct thermal_cooling_device *pos = NULL;
1221
1222         if (!cdev)
1223                 return;
1224
1225         mutex_lock(&thermal_list_lock);
1226         list_for_each_entry(pos, &thermal_cdev_list, node)
1227             if (pos == cdev)
1228                 break;
1229         if (pos != cdev) {
1230                 /* thermal cooling device not found */
1231                 mutex_unlock(&thermal_list_lock);
1232                 return;
1233         }
1234         list_del(&cdev->node);
1235
1236         /* Unbind all thermal zones associated with 'this' cdev */
1237         list_for_each_entry(tz, &thermal_tz_list, node) {
1238                 if (tz->ops->unbind) {
1239                         tz->ops->unbind(tz, cdev);
1240                         continue;
1241                 }
1242
1243                 if (!tz->tzp || !tz->tzp->tbp)
1244                         continue;
1245
1246                 tzp = tz->tzp;
1247                 for (i = 0; i < tzp->num_tbps; i++) {
1248                         if (tzp->tbp[i].cdev == cdev) {
1249                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1250                                 tzp->tbp[i].cdev = NULL;
1251                         }
1252                 }
1253         }
1254
1255         mutex_unlock(&thermal_list_lock);
1256
1257         if (cdev->type[0])
1258                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1259         device_remove_file(&cdev->device, &dev_attr_max_state);
1260         device_remove_file(&cdev->device, &dev_attr_cur_state);
1261
1262         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1263         device_unregister(&cdev->device);
1264         return;
1265 }
1266 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1267
1268 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1269 {
1270         struct thermal_instance *instance;
1271         unsigned long target = 0;
1272
1273         /* cooling device is updated*/
1274         if (cdev->updated)
1275                 return;
1276
1277         mutex_lock(&cdev->lock);
1278         /* Make sure cdev enters the deepest cooling state */
1279         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1280                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1281                                 instance->tz->id, instance->target);
1282                 if (instance->target == THERMAL_NO_TARGET)
1283                         continue;
1284                 if (instance->target > target)
1285                         target = instance->target;
1286         }
1287         mutex_unlock(&cdev->lock);
1288         cdev->ops->set_cur_state(cdev, target);
1289         cdev->updated = true;
1290         dev_dbg(&cdev->device, "set to state %lu\n", target);
1291 }
1292 EXPORT_SYMBOL(thermal_cdev_update);
1293
1294 /**
1295  * thermal_notify_framework - Sensor drivers use this API to notify framework
1296  * @tz:         thermal zone device
1297  * @trip:       indicates which trip point has been crossed
1298  *
1299  * This function handles the trip events from sensor drivers. It starts
1300  * throttling the cooling devices according to the policy configured.
1301  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1302  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1303  * The throttling policy is based on the configured platform data; if no
1304  * platform data is provided, this uses the step_wise throttling policy.
1305  */
1306 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1307 {
1308         handle_thermal_trip(tz, trip);
1309 }
1310 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1311
1312 /**
1313  * create_trip_attrs() - create attributes for trip points
1314  * @tz:         the thermal zone device
1315  * @mask:       Writeable trip point bitmap.
1316  *
1317  * helper function to instantiate sysfs entries for every trip
1318  * point and its properties of a struct thermal_zone_device.
1319  *
1320  * Return: 0 on success, the proper error value otherwise.
1321  */
1322 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1323 {
1324         int indx;
1325         int size = sizeof(struct thermal_attr) * tz->trips;
1326
1327         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1328         if (!tz->trip_type_attrs)
1329                 return -ENOMEM;
1330
1331         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1332         if (!tz->trip_temp_attrs) {
1333                 kfree(tz->trip_type_attrs);
1334                 return -ENOMEM;
1335         }
1336
1337         if (tz->ops->get_trip_hyst) {
1338                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1339                 if (!tz->trip_hyst_attrs) {
1340                         kfree(tz->trip_type_attrs);
1341                         kfree(tz->trip_temp_attrs);
1342                         return -ENOMEM;
1343                 }
1344         }
1345
1346
1347         for (indx = 0; indx < tz->trips; indx++) {
1348                 /* create trip type attribute */
1349                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1350                          "trip_point_%d_type", indx);
1351
1352                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1353                 tz->trip_type_attrs[indx].attr.attr.name =
1354                                                 tz->trip_type_attrs[indx].name;
1355                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1356                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1357
1358                 device_create_file(&tz->device,
1359                                    &tz->trip_type_attrs[indx].attr);
1360
1361                 /* create trip temp attribute */
1362                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1363                          "trip_point_%d_temp", indx);
1364
1365                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1366                 tz->trip_temp_attrs[indx].attr.attr.name =
1367                                                 tz->trip_temp_attrs[indx].name;
1368                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1369                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1370                 if (mask & (1 << indx)) {
1371                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1372                         tz->trip_temp_attrs[indx].attr.store =
1373                                                         trip_point_temp_store;
1374                 }
1375
1376                 device_create_file(&tz->device,
1377                                    &tz->trip_temp_attrs[indx].attr);
1378
1379                 /* create Optional trip hyst attribute */
1380                 if (!tz->ops->get_trip_hyst)
1381                         continue;
1382                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1383                          "trip_point_%d_hyst", indx);
1384
1385                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1386                 tz->trip_hyst_attrs[indx].attr.attr.name =
1387                                         tz->trip_hyst_attrs[indx].name;
1388                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1389                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1390                 if (tz->ops->set_trip_hyst) {
1391                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1392                         tz->trip_hyst_attrs[indx].attr.store =
1393                                         trip_point_hyst_store;
1394                 }
1395
1396                 device_create_file(&tz->device,
1397                                    &tz->trip_hyst_attrs[indx].attr);
1398         }
1399         return 0;
1400 }
1401
1402 static void remove_trip_attrs(struct thermal_zone_device *tz)
1403 {
1404         int indx;
1405
1406         for (indx = 0; indx < tz->trips; indx++) {
1407                 device_remove_file(&tz->device,
1408                                    &tz->trip_type_attrs[indx].attr);
1409                 device_remove_file(&tz->device,
1410                                    &tz->trip_temp_attrs[indx].attr);
1411                 if (tz->ops->get_trip_hyst)
1412                         device_remove_file(&tz->device,
1413                                   &tz->trip_hyst_attrs[indx].attr);
1414         }
1415         kfree(tz->trip_type_attrs);
1416         kfree(tz->trip_temp_attrs);
1417         kfree(tz->trip_hyst_attrs);
1418 }
1419
1420 /**
1421  * thermal_zone_device_register() - register a new thermal zone device
1422  * @type:       the thermal zone device type
1423  * @trips:      the number of trip points the thermal zone support
1424  * @mask:       a bit string indicating the writeablility of trip points
1425  * @devdata:    private device data
1426  * @ops:        standard thermal zone device callbacks
1427  * @tzp:        thermal zone platform parameters
1428  * @passive_delay: number of milliseconds to wait between polls when
1429  *                 performing passive cooling
1430  * @polling_delay: number of milliseconds to wait between polls when checking
1431  *                 whether trip points have been crossed (0 for interrupt
1432  *                 driven systems)
1433  *
1434  * This interface function adds a new thermal zone device (sensor) to
1435  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1436  * thermal cooling devices registered at the same time.
1437  * thermal_zone_device_unregister() must be called when the device is no
1438  * longer needed. The passive cooling depends on the .get_trend() return value.
1439  *
1440  * Return: a pointer to the created struct thermal_zone_device or an
1441  * in case of error, an ERR_PTR. Caller must check return value with
1442  * IS_ERR*() helpers.
1443  */
1444 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1445         int trips, int mask, void *devdata,
1446         struct thermal_zone_device_ops *ops,
1447         const struct thermal_zone_params *tzp,
1448         int passive_delay, int polling_delay)
1449 {
1450         struct thermal_zone_device *tz;
1451         enum thermal_trip_type trip_type;
1452         int result;
1453         int count;
1454         int passive = 0;
1455
1456         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1457                 return ERR_PTR(-EINVAL);
1458
1459         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1460                 return ERR_PTR(-EINVAL);
1461
1462         if (!ops)
1463                 return ERR_PTR(-EINVAL);
1464
1465         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1466                 return ERR_PTR(-EINVAL);
1467
1468         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1469         if (!tz)
1470                 return ERR_PTR(-ENOMEM);
1471
1472         INIT_LIST_HEAD(&tz->thermal_instances);
1473         idr_init(&tz->idr);
1474         mutex_init(&tz->lock);
1475         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1476         if (result) {
1477                 kfree(tz);
1478                 return ERR_PTR(result);
1479         }
1480
1481         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1482         tz->ops = ops;
1483         tz->tzp = tzp;
1484         tz->device.class = &thermal_class;
1485         tz->devdata = devdata;
1486         tz->trips = trips;
1487         tz->passive_delay = passive_delay;
1488         tz->polling_delay = polling_delay;
1489
1490         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1491         result = device_register(&tz->device);
1492         if (result) {
1493                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1494                 kfree(tz);
1495                 return ERR_PTR(result);
1496         }
1497
1498         /* sys I/F */
1499         if (type) {
1500                 result = device_create_file(&tz->device, &dev_attr_type);
1501                 if (result)
1502                         goto unregister;
1503         }
1504
1505         result = device_create_file(&tz->device, &dev_attr_temp);
1506         if (result)
1507                 goto unregister;
1508
1509         if (ops->get_mode) {
1510                 result = device_create_file(&tz->device, &dev_attr_mode);
1511                 if (result)
1512                         goto unregister;
1513         }
1514
1515         result = create_trip_attrs(tz, mask);
1516         if (result)
1517                 goto unregister;
1518
1519         for (count = 0; count < trips; count++) {
1520                 tz->ops->get_trip_type(tz, count, &trip_type);
1521                 if (trip_type == THERMAL_TRIP_PASSIVE)
1522                         passive = 1;
1523         }
1524
1525         if (!passive) {
1526                 result = device_create_file(&tz->device, &dev_attr_passive);
1527                 if (result)
1528                         goto unregister;
1529         }
1530
1531 #ifdef CONFIG_THERMAL_EMULATION
1532         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1533         if (result)
1534                 goto unregister;
1535 #endif
1536         /* Create policy attribute */
1537         result = device_create_file(&tz->device, &dev_attr_policy);
1538         if (result)
1539                 goto unregister;
1540
1541         /* Update 'this' zone's governor information */
1542         mutex_lock(&thermal_governor_lock);
1543
1544         if (tz->tzp)
1545                 tz->governor = __find_governor(tz->tzp->governor_name);
1546         else
1547                 tz->governor = def_governor;
1548
1549         mutex_unlock(&thermal_governor_lock);
1550
1551         if (!tz->tzp || !tz->tzp->no_hwmon) {
1552                 result = thermal_add_hwmon_sysfs(tz);
1553                 if (result)
1554                         goto unregister;
1555         }
1556
1557         mutex_lock(&thermal_list_lock);
1558         list_add_tail(&tz->node, &thermal_tz_list);
1559         mutex_unlock(&thermal_list_lock);
1560
1561         /* Bind cooling devices for this zone */
1562         bind_tz(tz);
1563
1564         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1565
1566         if (!tz->ops->get_temp)
1567                 thermal_zone_device_set_polling(tz, 0);
1568
1569         thermal_zone_device_update(tz);
1570
1571         if (!result)
1572                 return tz;
1573
1574 unregister:
1575         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1576         device_unregister(&tz->device);
1577         return ERR_PTR(result);
1578 }
1579 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1580
1581 /**
1582  * thermal_device_unregister - removes the registered thermal zone device
1583  * @tz: the thermal zone device to remove
1584  */
1585 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1586 {
1587         int i;
1588         const struct thermal_zone_params *tzp;
1589         struct thermal_cooling_device *cdev;
1590         struct thermal_zone_device *pos = NULL;
1591
1592         if (!tz)
1593                 return;
1594
1595         tzp = tz->tzp;
1596
1597         mutex_lock(&thermal_list_lock);
1598         list_for_each_entry(pos, &thermal_tz_list, node)
1599             if (pos == tz)
1600                 break;
1601         if (pos != tz) {
1602                 /* thermal zone device not found */
1603                 mutex_unlock(&thermal_list_lock);
1604                 return;
1605         }
1606         list_del(&tz->node);
1607
1608         /* Unbind all cdevs associated with 'this' thermal zone */
1609         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1610                 if (tz->ops->unbind) {
1611                         tz->ops->unbind(tz, cdev);
1612                         continue;
1613                 }
1614
1615                 if (!tzp || !tzp->tbp)
1616                         break;
1617
1618                 for (i = 0; i < tzp->num_tbps; i++) {
1619                         if (tzp->tbp[i].cdev == cdev) {
1620                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1621                                 tzp->tbp[i].cdev = NULL;
1622                         }
1623                 }
1624         }
1625
1626         mutex_unlock(&thermal_list_lock);
1627
1628         thermal_zone_device_set_polling(tz, 0);
1629
1630         if (tz->type[0])
1631                 device_remove_file(&tz->device, &dev_attr_type);
1632         device_remove_file(&tz->device, &dev_attr_temp);
1633         if (tz->ops->get_mode)
1634                 device_remove_file(&tz->device, &dev_attr_mode);
1635         device_remove_file(&tz->device, &dev_attr_policy);
1636         remove_trip_attrs(tz);
1637         tz->governor = NULL;
1638
1639         thermal_remove_hwmon_sysfs(tz);
1640         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1641         idr_destroy(&tz->idr);
1642         mutex_destroy(&tz->lock);
1643         device_unregister(&tz->device);
1644         return;
1645 }
1646 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1647
1648 /**
1649  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1650  * @name: thermal zone name to fetch the temperature
1651  *
1652  * When only one zone is found with the passed name, returns a reference to it.
1653  *
1654  * Return: On success returns a reference to an unique thermal zone with
1655  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1656  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1657  */
1658 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1659 {
1660         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1661         unsigned int found = 0;
1662
1663         if (!name)
1664                 goto exit;
1665
1666         mutex_lock(&thermal_list_lock);
1667         list_for_each_entry(pos, &thermal_tz_list, node)
1668                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1669                         found++;
1670                         ref = pos;
1671                 }
1672         mutex_unlock(&thermal_list_lock);
1673
1674         /* nothing has been found, thus an error code for it */
1675         if (found == 0)
1676                 ref = ERR_PTR(-ENODEV);
1677         else if (found > 1)
1678         /* Success only when an unique zone is found */
1679                 ref = ERR_PTR(-EEXIST);
1680
1681 exit:
1682         return ref;
1683 }
1684 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1685
1686 #ifdef CONFIG_NET
1687 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1688         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1689 };
1690
1691 static struct genl_family thermal_event_genl_family = {
1692         .id = GENL_ID_GENERATE,
1693         .name = THERMAL_GENL_FAMILY_NAME,
1694         .version = THERMAL_GENL_VERSION,
1695         .maxattr = THERMAL_GENL_ATTR_MAX,
1696         .mcgrps = thermal_event_mcgrps,
1697         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1698 };
1699
1700 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1701                                         enum events event)
1702 {
1703         struct sk_buff *skb;
1704         struct nlattr *attr;
1705         struct thermal_genl_event *thermal_event;
1706         void *msg_header;
1707         int size;
1708         int result;
1709         static unsigned int thermal_event_seqnum;
1710
1711         if (!tz)
1712                 return -EINVAL;
1713
1714         /* allocate memory */
1715         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1716                nla_total_size(0);
1717
1718         skb = genlmsg_new(size, GFP_ATOMIC);
1719         if (!skb)
1720                 return -ENOMEM;
1721
1722         /* add the genetlink message header */
1723         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1724                                  &thermal_event_genl_family, 0,
1725                                  THERMAL_GENL_CMD_EVENT);
1726         if (!msg_header) {
1727                 nlmsg_free(skb);
1728                 return -ENOMEM;
1729         }
1730
1731         /* fill the data */
1732         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1733                            sizeof(struct thermal_genl_event));
1734
1735         if (!attr) {
1736                 nlmsg_free(skb);
1737                 return -EINVAL;
1738         }
1739
1740         thermal_event = nla_data(attr);
1741         if (!thermal_event) {
1742                 nlmsg_free(skb);
1743                 return -EINVAL;
1744         }
1745
1746         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1747
1748         thermal_event->orig = tz->id;
1749         thermal_event->event = event;
1750
1751         /* send multicast genetlink message */
1752         result = genlmsg_end(skb, msg_header);
1753         if (result < 0) {
1754                 nlmsg_free(skb);
1755                 return result;
1756         }
1757
1758         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1759                                    0, GFP_ATOMIC);
1760         if (result)
1761                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1762
1763         return result;
1764 }
1765 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1766
1767 static int genetlink_init(void)
1768 {
1769         return genl_register_family(&thermal_event_genl_family);
1770 }
1771
1772 static void genetlink_exit(void)
1773 {
1774         genl_unregister_family(&thermal_event_genl_family);
1775 }
1776 #else /* !CONFIG_NET */
1777 static inline int genetlink_init(void) { return 0; }
1778 static inline void genetlink_exit(void) {}
1779 #endif /* !CONFIG_NET */
1780
1781 static int __init thermal_register_governors(void)
1782 {
1783         int result;
1784
1785         result = thermal_gov_step_wise_register();
1786         if (result)
1787                 return result;
1788
1789         result = thermal_gov_fair_share_register();
1790         if (result)
1791                 return result;
1792
1793         return thermal_gov_user_space_register();
1794 }
1795
1796 static void thermal_unregister_governors(void)
1797 {
1798         thermal_gov_step_wise_unregister();
1799         thermal_gov_fair_share_unregister();
1800         thermal_gov_user_space_unregister();
1801 }
1802
1803 static int __init thermal_init(void)
1804 {
1805         int result;
1806
1807         result = thermal_register_governors();
1808         if (result)
1809                 goto error;
1810
1811         result = class_register(&thermal_class);
1812         if (result)
1813                 goto unregister_governors;
1814
1815         result = genetlink_init();
1816         if (result)
1817                 goto unregister_class;
1818
1819         result = of_parse_thermal_zones();
1820         if (result)
1821                 goto exit_netlink;
1822
1823         return 0;
1824
1825 exit_netlink:
1826         genetlink_exit();
1827 unregister_governors:
1828         thermal_unregister_governors();
1829 unregister_class:
1830         class_unregister(&thermal_class);
1831 error:
1832         idr_destroy(&thermal_tz_idr);
1833         idr_destroy(&thermal_cdev_idr);
1834         mutex_destroy(&thermal_idr_lock);
1835         mutex_destroy(&thermal_list_lock);
1836         mutex_destroy(&thermal_governor_lock);
1837         return result;
1838 }
1839
1840 static void __exit thermal_exit(void)
1841 {
1842         of_thermal_destroy_zones();
1843         genetlink_exit();
1844         class_unregister(&thermal_class);
1845         thermal_unregister_governors();
1846         idr_destroy(&thermal_tz_idr);
1847         idr_destroy(&thermal_cdev_idr);
1848         mutex_destroy(&thermal_idr_lock);
1849         mutex_destroy(&thermal_list_lock);
1850         mutex_destroy(&thermal_governor_lock);
1851 }
1852
1853 fs_initcall(thermal_init);
1854 module_exit(thermal_exit);