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 #define CREATE_TRACE_POINTS
  42 #include <trace/events/thermal.h>
  43
  44 #include "thermal_core.h"
  45 #include "thermal_hwmon.h"
  46
  47 MODULE_AUTHOR("Zhang Rui");
  48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  49 MODULE_LICENSE("GPL v2");
  50
  51 static DEFINE_IDR(thermal_tz_idr);
  52 static DEFINE_IDR(thermal_cdev_idr);
  53 static DEFINE_MUTEX(thermal_idr_lock);
  54
  55 static LIST_HEAD(thermal_tz_list);
  56 static LIST_HEAD(thermal_cdev_list);
  57 static LIST_HEAD(thermal_governor_list);
  58
  59 static DEFINE_MUTEX(thermal_list_lock);
  60 static DEFINE_MUTEX(thermal_governor_lock);
  61
  62 static struct thermal_governor *def_governor;
  63
  64 static struct thermal_governor *__find_governor(const char *name)
  65 {
  66         struct thermal_governor *pos;
  67
  68         if (!name || !name[0])
  69                 return def_governor;
  70
  71         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  72                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  73                         return pos;
  74
  75         return NULL;
  76 }
  77
  78 /**
  79  * bind_previous_governor() - bind the previous governor of the thermal zone
  80  * @tz:         a valid pointer to a struct thermal_zone_device
  81  * @failed_gov_name:    the name of the governor that failed to register
  82  *
  83  * Register the previous governor of the thermal zone after a new
  84  * governor has failed to be bound.
  85  */
  86 static void bind_previous_governor(struct thermal_zone_device *tz,
  87                                    const char *failed_gov_name)
  88 {
  89         if (tz->governor && tz->governor->bind_to_tz) {
  90                 if (tz->governor->bind_to_tz(tz)) {
  91                         dev_err(&tz->device,
  92                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  93                                 failed_gov_name, tz->governor->name, tz->type);
  94                         tz->governor = NULL;
  95                 }
  96         }
  97 }
  98
  99 /**
 100  * thermal_set_governor() - Switch to another governor
 101  * @tz:         a valid pointer to a struct thermal_zone_device
 102  * @new_gov:    pointer to the new governor
 103  *
 104  * Change the governor of thermal zone @tz.
 105  *
 106  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
 107  */
 108 static int thermal_set_governor(struct thermal_zone_device *tz,
 109                                 struct thermal_governor *new_gov)
 110 {
 111         int ret = 0;
 112
 113         if (tz->governor && tz->governor->unbind_from_tz)
 114                 tz->governor->unbind_from_tz(tz);
 115
 116         if (new_gov && new_gov->bind_to_tz) {
 117                 ret = new_gov->bind_to_tz(tz);
 118                 if (ret) {
 119                         bind_previous_governor(tz, new_gov->name);
 120
 121                         return ret;
 122                 }
 123         }
 124
 125         tz->governor = new_gov;
 126
 127         return ret;
 128 }
 129
 130 int thermal_register_governor(struct thermal_governor *governor)
 131 {
 132         int err;
 133         const char *name;
 134         struct thermal_zone_device *pos;
 135
 136         if (!governor)
 137                 return -EINVAL;
 138
 139         mutex_lock(&thermal_governor_lock);
 140
 141         err = -EBUSY;
 142         if (__find_governor(governor->name) == NULL) {
 143                 err = 0;
 144                 list_add(&governor->governor_list, &thermal_governor_list);
 145                 if (!def_governor && !strncmp(governor->name,
 146                         DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
 147                         def_governor = governor;
 148         }
 149
 150         mutex_lock(&thermal_list_lock);
 151
 152         list_for_each_entry(pos, &thermal_tz_list, node) {
 153                 /*
 154                  * only thermal zones with specified tz->tzp->governor_name
 155                  * may run with tz->govenor unset
 156                  */
 157                 if (pos->governor)
 158                         continue;
 159
 160                 name = pos->tzp->governor_name;
 161
 162                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 163                         int ret;
 164
 165                         ret = thermal_set_governor(pos, governor);
 166                         if (ret)
 167                                 dev_err(&pos->device,
 168                                         "Failed to set governor %s for thermal zone %s: %d\n",
 169                                         governor->name, pos->type, ret);
 170                 }
 171         }
 172
 173         mutex_unlock(&thermal_list_lock);
 174         mutex_unlock(&thermal_governor_lock);
 175
 176         return err;
 177 }
 178
 179 void thermal_unregister_governor(struct thermal_governor *governor)
 180 {
 181         struct thermal_zone_device *pos;
 182
 183         if (!governor)
 184                 return;
 185
 186         mutex_lock(&thermal_governor_lock);
 187
 188         if (__find_governor(governor->name) == NULL)
 189                 goto exit;
 190
 191         mutex_lock(&thermal_list_lock);
 192
 193         list_for_each_entry(pos, &thermal_tz_list, node) {
 194                 if (!strncasecmp(pos->governor->name, governor->name,
 195                                                 THERMAL_NAME_LENGTH))
 196                         thermal_set_governor(pos, NULL);
 197         }
 198
 199         mutex_unlock(&thermal_list_lock);
 200         list_del(&governor->governor_list);
 201 exit:
 202         mutex_unlock(&thermal_governor_lock);
 203         return;
 204 }
 205
 206 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 207 {
 208         int ret;
 209
 210         if (lock)
 211                 mutex_lock(lock);
 212         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 213         if (lock)
 214                 mutex_unlock(lock);
 215         if (unlikely(ret < 0))
 216                 return ret;
 217         *id = ret;
 218         return 0;
 219 }
 220
 221 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 222 {
 223         if (lock)
 224                 mutex_lock(lock);
 225         idr_remove(idr, id);
 226         if (lock)
 227                 mutex_unlock(lock);
 228 }
 229
 230 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 231 {
 232         enum thermal_trend trend;
 233
 234         if (tz->emul_temperature || !tz->ops->get_trend ||
 235             tz->ops->get_trend(tz, trip, &trend)) {
 236                 if (tz->temperature > tz->last_temperature)
 237                         trend = THERMAL_TREND_RAISING;
 238                 else if (tz->temperature < tz->last_temperature)
 239                         trend = THERMAL_TREND_DROPPING;
 240                 else
 241                         trend = THERMAL_TREND_STABLE;
 242         }
 243
 244         return trend;
 245 }
 246 EXPORT_SYMBOL(get_tz_trend);
 247
 248 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 249                         struct thermal_cooling_device *cdev, int trip)
 250 {
 251         struct thermal_instance *pos = NULL;
 252         struct thermal_instance *target_instance = NULL;
 253
 254         mutex_lock(&tz->lock);
 255         mutex_lock(&cdev->lock);
 256
 257         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 258                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 259                         target_instance = pos;
 260                         break;
 261                 }
 262         }
 263
 264         mutex_unlock(&cdev->lock);
 265         mutex_unlock(&tz->lock);
 266
 267         return target_instance;
 268 }
 269 EXPORT_SYMBOL(get_thermal_instance);
 270
 271 static void print_bind_err_msg(struct thermal_zone_device *tz,
 272                         struct thermal_cooling_device *cdev, int ret)
 273 {
 274         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 275                                 tz->type, cdev->type, ret);
 276 }
 277
 278 static void __bind(struct thermal_zone_device *tz, int mask,
 279                         struct thermal_cooling_device *cdev,
 280                         unsigned long *limits,
 281                         unsigned int weight)
 282 {
 283         int i, ret;
 284
 285         for (i = 0; i < tz->trips; i++) {
 286                 if (mask & (1 << i)) {
 287                         unsigned long upper, lower;
 288
 289                         upper = THERMAL_NO_LIMIT;
 290                         lower = THERMAL_NO_LIMIT;
 291                         if (limits) {
 292                                 lower = limits[i * 2];
 293                                 upper = limits[i * 2 + 1];
 294                         }
 295                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 296                                                                upper, lower,
 297                                                                weight);
 298                         if (ret)
 299                                 print_bind_err_msg(tz, cdev, ret);
 300                 }
 301         }
 302 }
 303
 304 static void __unbind(struct thermal_zone_device *tz, int mask,
 305                         struct thermal_cooling_device *cdev)
 306 {
 307         int i;
 308
 309         for (i = 0; i < tz->trips; i++)
 310                 if (mask & (1 << i))
 311                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 312 }
 313
 314 static void bind_cdev(struct thermal_cooling_device *cdev)
 315 {
 316         int i, ret;
 317         const struct thermal_zone_params *tzp;
 318         struct thermal_zone_device *pos = NULL;
 319
 320         mutex_lock(&thermal_list_lock);
 321
 322         list_for_each_entry(pos, &thermal_tz_list, node) {
 323                 if (!pos->tzp && !pos->ops->bind)
 324                         continue;
 325
 326                 if (pos->ops->bind) {
 327                         ret = pos->ops->bind(pos, cdev);
 328                         if (ret)
 329                                 print_bind_err_msg(pos, cdev, ret);
 330                         continue;
 331                 }
 332
 333                 tzp = pos->tzp;
 334                 if (!tzp || !tzp->tbp)
 335                         continue;
 336
 337                 for (i = 0; i < tzp->num_tbps; i++) {
 338                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 339                                 continue;
 340                         if (tzp->tbp[i].match(pos, cdev))
 341                                 continue;
 342                         tzp->tbp[i].cdev = cdev;
 343                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 344                                tzp->tbp[i].binding_limits,
 345                                tzp->tbp[i].weight);
 346                 }
 347         }
 348
 349         mutex_unlock(&thermal_list_lock);
 350 }
 351
 352 static void bind_tz(struct thermal_zone_device *tz)
 353 {
 354         int i, ret;
 355         struct thermal_cooling_device *pos = NULL;
 356         const struct thermal_zone_params *tzp = tz->tzp;
 357
 358         if (!tzp && !tz->ops->bind)
 359                 return;
 360
 361         mutex_lock(&thermal_list_lock);
 362
 363         /* If there is ops->bind, try to use ops->bind */
 364         if (tz->ops->bind) {
 365                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 366                         ret = tz->ops->bind(tz, pos);
 367                         if (ret)
 368                                 print_bind_err_msg(tz, pos, ret);
 369                 }
 370                 goto exit;
 371         }
 372
 373         if (!tzp || !tzp->tbp)
 374                 goto exit;
 375
 376         list_for_each_entry(pos, &thermal_cdev_list, node) {
 377                 for (i = 0; i < tzp->num_tbps; i++) {
 378                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 379                                 continue;
 380                         if (tzp->tbp[i].match(tz, pos))
 381                                 continue;
 382                         tzp->tbp[i].cdev = pos;
 383                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 384                                tzp->tbp[i].binding_limits,
 385                                tzp->tbp[i].weight);
 386                 }
 387         }
 388 exit:
 389         mutex_unlock(&thermal_list_lock);
 390 }
 391
 392 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 393                                             int delay)
 394 {
 395         if (delay > 1000)
 396                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 397                                  round_jiffies(msecs_to_jiffies(delay)));
 398         else if (delay)
 399                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 400                                  msecs_to_jiffies(delay));
 401         else
 402                 cancel_delayed_work(&tz->poll_queue);
 403 }
 404
 405 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 406 {
 407         mutex_lock(&tz->lock);
 408
 409         if (tz->passive)
 410                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 411         else if (tz->polling_delay)
 412                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 413         else
 414                 thermal_zone_device_set_polling(tz, 0);
 415
 416         mutex_unlock(&tz->lock);
 417 }
 418
 419 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 420                         int trip, enum thermal_trip_type trip_type)
 421 {
 422         tz->governor ? tz->governor->throttle(tz, trip) :
 423                        def_governor->throttle(tz, trip);
 424 }
 425
 426 static void handle_critical_trips(struct thermal_zone_device *tz,
 427                                 int trip, enum thermal_trip_type trip_type)
 428 {
 429         int trip_temp;
 430
 431         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 432
 433         /* If we have not crossed the trip_temp, we do not care. */
 434         if (trip_temp <= 0 || tz->temperature < trip_temp)
 435                 return;
 436
 437         trace_thermal_zone_trip(tz, trip, trip_type);
 438
 439         if (tz->ops->notify)
 440                 tz->ops->notify(tz, trip, trip_type);
 441
 442         if (trip_type == THERMAL_TRIP_CRITICAL) {
 443                 dev_emerg(&tz->device,
 444                           "critical temperature reached(%d C),shutting down\n",
 445                           tz->temperature / 1000);
 446                 orderly_poweroff(true);
 447         }
 448 }
 449
 450 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 451 {
 452         enum thermal_trip_type type;
 453
 454         tz->ops->get_trip_type(tz, trip, &type);
 455
 456         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 457                 handle_critical_trips(tz, trip, type);
 458         else
 459                 handle_non_critical_trips(tz, trip, type);
 460         /*
 461          * Alright, we handled this trip successfully.
 462          * So, start monitoring again.
 463          */
 464         monitor_thermal_zone(tz);
 465 }
 466
 467 /**
 468  * thermal_zone_get_temp() - returns the temperature of a thermal zone
 469  * @tz: a valid pointer to a struct thermal_zone_device
 470  * @temp: a valid pointer to where to store the resulting temperature.
 471  *
 472  * When a valid thermal zone reference is passed, it will fetch its
 473  * temperature and fill @temp.
 474  *
 475  * Return: On success returns 0, an error code otherwise
 476  */
 477 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 478 {
 479         int ret = -EINVAL;
 480         int count;
 481         int crit_temp = INT_MAX;
 482         enum thermal_trip_type type;
 483
 484         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 485                 goto exit;
 486
 487         mutex_lock(&tz->lock);
 488
 489         ret = tz->ops->get_temp(tz, temp);
 490
 491         if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 492                 for (count = 0; count < tz->trips; count++) {
 493                         ret = tz->ops->get_trip_type(tz, count, &type);
 494                         if (!ret && type == THERMAL_TRIP_CRITICAL) {
 495                                 ret = tz->ops->get_trip_temp(tz, count,
 496                                                 &crit_temp);
 497                                 break;
 498                         }
 499                 }
 500
 501                 /*
 502                  * Only allow emulating a temperature when the real temperature
 503                  * is below the critical temperature so that the emulation code
 504                  * cannot hide critical conditions.
 505                  */
 506                 if (!ret && *temp < crit_temp)
 507                         *temp = tz->emul_temperature;
 508         }
 509
 510         mutex_unlock(&tz->lock);
 511 exit:
 512         return ret;
 513 }
 514 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 515
 516 static void update_temperature(struct thermal_zone_device *tz)
 517 {
 518         int temp, ret;
 519
 520         ret = thermal_zone_get_temp(tz, &temp);
 521         if (ret) {
 522                 if (ret != -EAGAIN)
 523                         dev_warn(&tz->device,
 524                                  "failed to read out thermal zone (%d)\n",
 525                                  ret);
 526                 return;
 527         }
 528
 529         mutex_lock(&tz->lock);
 530         tz->last_temperature = tz->temperature;
 531         tz->temperature = temp;
 532         mutex_unlock(&tz->lock);
 533
 534         trace_thermal_temperature(tz);
 535         dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 536                                 tz->last_temperature, tz->temperature);
 537 }
 538
 539 void thermal_zone_device_update(struct thermal_zone_device *tz)
 540 {
 541         int count;
 542
 543         if (!tz->ops->get_temp)
 544                 return;
 545
 546         update_temperature(tz);
 547
 548         for (count = 0; count < tz->trips; count++)
 549                 handle_thermal_trip(tz, count);
 550 }
 551 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 552
 553 static void thermal_zone_device_check(struct work_struct *work)
 554 {
 555         struct thermal_zone_device *tz = container_of(work, struct
 556                                                       thermal_zone_device,
 557                                                       poll_queue.work);
 558         thermal_zone_device_update(tz);
 559 }
 560
 561 /* sys I/F for thermal zone */
 562
 563 #define to_thermal_zone(_dev) \
 564         container_of(_dev, struct thermal_zone_device, device)
 565
 566 static ssize_t
 567 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 568 {
 569         struct thermal_zone_device *tz = to_thermal_zone(dev);
 570
 571         return sprintf(buf, "%s\n", tz->type);
 572 }
 573
 574 static ssize_t
 575 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 576 {
 577         struct thermal_zone_device *tz = to_thermal_zone(dev);
 578         int temperature, ret;
 579
 580         ret = thermal_zone_get_temp(tz, &temperature);
 581
 582         if (ret)
 583                 return ret;
 584
 585         return sprintf(buf, "%d\n", temperature);
 586 }
 587
 588 static ssize_t
 589 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 590 {
 591         struct thermal_zone_device *tz = to_thermal_zone(dev);
 592         enum thermal_device_mode mode;
 593         int result;
 594
 595         if (!tz->ops->get_mode)
 596                 return -EPERM;
 597
 598         result = tz->ops->get_mode(tz, &mode);
 599         if (result)
 600                 return result;
 601
 602         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 603                        : "disabled");
 604 }
 605
 606 static ssize_t
 607 mode_store(struct device *dev, struct device_attribute *attr,
 608            const char *buf, size_t count)
 609 {
 610         struct thermal_zone_device *tz = to_thermal_zone(dev);
 611         int result;
 612
 613         if (!tz->ops->set_mode)
 614                 return -EPERM;
 615
 616         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 617                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 618         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 619                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 620         else
 621                 result = -EINVAL;
 622
 623         if (result)
 624                 return result;
 625
 626         return count;
 627 }
 628
 629 static ssize_t
 630 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 631                      char *buf)
 632 {
 633         struct thermal_zone_device *tz = to_thermal_zone(dev);
 634         enum thermal_trip_type type;
 635         int trip, result;
 636
 637         if (!tz->ops->get_trip_type)
 638                 return -EPERM;
 639
 640         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 641                 return -EINVAL;
 642
 643         result = tz->ops->get_trip_type(tz, trip, &type);
 644         if (result)
 645                 return result;
 646
 647         switch (type) {
 648         case THERMAL_TRIP_CRITICAL:
 649                 return sprintf(buf, "critical\n");
 650         case THERMAL_TRIP_HOT:
 651                 return sprintf(buf, "hot\n");
 652         case THERMAL_TRIP_PASSIVE:
 653                 return sprintf(buf, "passive\n");
 654         case THERMAL_TRIP_ACTIVE:
 655                 return sprintf(buf, "active\n");
 656         default:
 657                 return sprintf(buf, "unknown\n");
 658         }
 659 }
 660
 661 static ssize_t
 662 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 663                      const char *buf, size_t count)
 664 {
 665         struct thermal_zone_device *tz = to_thermal_zone(dev);
 666         int trip, ret;
 667         unsigned long temperature;
 668
 669         if (!tz->ops->set_trip_temp)
 670                 return -EPERM;
 671
 672         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 673                 return -EINVAL;
 674
 675         if (kstrtoul(buf, 10, &temperature))
 676                 return -EINVAL;
 677
 678         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 679
 680         return ret ? ret : count;
 681 }
 682
 683 static ssize_t
 684 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 685                      char *buf)
 686 {
 687         struct thermal_zone_device *tz = to_thermal_zone(dev);
 688         int trip, ret;
 689         int temperature;
 690
 691         if (!tz->ops->get_trip_temp)
 692                 return -EPERM;
 693
 694         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 695                 return -EINVAL;
 696
 697         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 698
 699         if (ret)
 700                 return ret;
 701
 702         return sprintf(buf, "%d\n", temperature);
 703 }
 704
 705 static ssize_t
 706 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 707                         const char *buf, size_t count)
 708 {
 709         struct thermal_zone_device *tz = to_thermal_zone(dev);
 710         int trip, ret;
 711         int temperature;
 712
 713         if (!tz->ops->set_trip_hyst)
 714                 return -EPERM;
 715
 716         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 717                 return -EINVAL;
 718
 719         if (kstrtoint(buf, 10, &temperature))
 720                 return -EINVAL;
 721
 722         /*
 723          * We are not doing any check on the 'temperature' value
 724          * here. The driver implementing 'set_trip_hyst' has to
 725          * take care of this.
 726          */
 727         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 728
 729         return ret ? ret : count;
 730 }
 731
 732 static ssize_t
 733 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 734                         char *buf)
 735 {
 736         struct thermal_zone_device *tz = to_thermal_zone(dev);
 737         int trip, ret;
 738         int temperature;
 739
 740         if (!tz->ops->get_trip_hyst)
 741                 return -EPERM;
 742
 743         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 744                 return -EINVAL;
 745
 746         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 747
 748         return ret ? ret : sprintf(buf, "%d\n", temperature);
 749 }
 750
 751 static ssize_t
 752 passive_store(struct device *dev, struct device_attribute *attr,
 753                     const char *buf, size_t count)
 754 {
 755         struct thermal_zone_device *tz = to_thermal_zone(dev);
 756         struct thermal_cooling_device *cdev = NULL;
 757         int state;
 758
 759         if (!sscanf(buf, "%d\n", &state))
 760                 return -EINVAL;
 761
 762         /* sanity check: values below 1000 millicelcius don't make sense
 763          * and can cause the system to go into a thermal heart attack
 764          */
 765         if (state && state < 1000)
 766                 return -EINVAL;
 767
 768         if (state && !tz->forced_passive) {
 769                 mutex_lock(&thermal_list_lock);
 770                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 771                         if (!strncmp("Processor", cdev->type,
 772                                      sizeof("Processor")))
 773                                 thermal_zone_bind_cooling_device(tz,
 774                                                 THERMAL_TRIPS_NONE, cdev,
 775                                                 THERMAL_NO_LIMIT,
 776                                                 THERMAL_NO_LIMIT,
 777                                                 THERMAL_WEIGHT_DEFAULT);
 778                 }
 779                 mutex_unlock(&thermal_list_lock);
 780                 if (!tz->passive_delay)
 781                         tz->passive_delay = 1000;
 782         } else if (!state && tz->forced_passive) {
 783                 mutex_lock(&thermal_list_lock);
 784                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 785                         if (!strncmp("Processor", cdev->type,
 786                                      sizeof("Processor")))
 787                                 thermal_zone_unbind_cooling_device(tz,
 788                                                                    THERMAL_TRIPS_NONE,
 789                                                                    cdev);
 790                 }
 791                 mutex_unlock(&thermal_list_lock);
 792                 tz->passive_delay = 0;
 793         }
 794
 795         tz->forced_passive = state;
 796
 797         thermal_zone_device_update(tz);
 798
 799         return count;
 800 }
 801
 802 static ssize_t
 803 passive_show(struct device *dev, struct device_attribute *attr,
 804                    char *buf)
 805 {
 806         struct thermal_zone_device *tz = to_thermal_zone(dev);
 807
 808         return sprintf(buf, "%d\n", tz->forced_passive);
 809 }
 810
 811 static ssize_t
 812 policy_store(struct device *dev, struct device_attribute *attr,
 813                     const char *buf, size_t count)
 814 {
 815         int ret = -EINVAL;
 816         struct thermal_zone_device *tz = to_thermal_zone(dev);
 817         struct thermal_governor *gov;
 818         char name[THERMAL_NAME_LENGTH];
 819
 820         snprintf(name, sizeof(name), "%s", buf);
 821
 822         mutex_lock(&thermal_governor_lock);
 823         mutex_lock(&tz->lock);
 824
 825         gov = __find_governor(strim(name));
 826         if (!gov)
 827                 goto exit;
 828
 829         ret = thermal_set_governor(tz, gov);
 830         if (!ret)
 831                 ret = count;
 832
 833 exit:
 834         mutex_unlock(&tz->lock);
 835         mutex_unlock(&thermal_governor_lock);
 836         return ret;
 837 }
 838
 839 static ssize_t
 840 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 841 {
 842         struct thermal_zone_device *tz = to_thermal_zone(dev);
 843
 844         return sprintf(buf, "%s\n", tz->governor->name);
 845 }
 846
 847 static ssize_t
 848 available_policies_show(struct device *dev, struct device_attribute *devattr,
 849                         char *buf)
 850 {
 851         struct thermal_governor *pos;
 852         ssize_t count = 0;
 853         ssize_t size = PAGE_SIZE;
 854
 855         mutex_lock(&thermal_governor_lock);
 856
 857         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 858                 size = PAGE_SIZE - count;
 859                 count += scnprintf(buf + count, size, "%s ", pos->name);
 860         }
 861         count += scnprintf(buf + count, size, "\n");
 862
 863         mutex_unlock(&thermal_governor_lock);
 864
 865         return count;
 866 }
 867
 868 static ssize_t
 869 emul_temp_store(struct device *dev, struct device_attribute *attr,
 870                      const char *buf, size_t count)
 871 {
 872         struct thermal_zone_device *tz = to_thermal_zone(dev);
 873         int ret = 0;
 874         unsigned long temperature;
 875
 876         if (kstrtoul(buf, 10, &temperature))
 877                 return -EINVAL;
 878
 879         if (!tz->ops->set_emul_temp) {
 880                 mutex_lock(&tz->lock);
 881                 tz->emul_temperature = temperature;
 882                 mutex_unlock(&tz->lock);
 883         } else {
 884                 ret = tz->ops->set_emul_temp(tz, temperature);
 885         }
 886
 887         if (!ret)
 888                 thermal_zone_device_update(tz);
 889
 890         return ret ? ret : count;
 891 }
 892 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 893
 894 static ssize_t
 895 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 896                        char *buf)
 897 {
 898         struct thermal_zone_device *tz = to_thermal_zone(dev);
 899
 900         if (tz->tzp)
 901                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 902         else
 903                 return -EIO;
 904 }
 905
 906 static ssize_t
 907 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 908                         const char *buf, size_t count)
 909 {
 910         struct thermal_zone_device *tz = to_thermal_zone(dev);
 911         u32 sustainable_power;
 912
 913         if (!tz->tzp)
 914                 return -EIO;
 915
 916         if (kstrtou32(buf, 10, &sustainable_power))
 917                 return -EINVAL;
 918
 919         tz->tzp->sustainable_power = sustainable_power;
 920
 921         return count;
 922 }
 923 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 924                 sustainable_power_store);
 925
 926 #define create_s32_tzp_attr(name)                                       \
 927         static ssize_t                                                  \
 928         name##_show(struct device *dev, struct device_attribute *devattr, \
 929                 char *buf)                                              \
 930         {                                                               \
 931         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
 932                                                                         \
 933         if (tz->tzp)                                                    \
 934                 return sprintf(buf, "%u\n", tz->tzp->name);             \
 935         else                                                            \
 936                 return -EIO;                                            \
 937         }                                                               \
 938                                                                         \
 939         static ssize_t                                                  \
 940         name##_store(struct device *dev, struct device_attribute *devattr, \
 941                 const char *buf, size_t count)                          \
 942         {                                                               \
 943                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
 944                 s32 value;                                              \
 945                                                                         \
 946                 if (!tz->tzp)                                           \
 947                         return -EIO;                                    \
 948                                                                         \
 949                 if (kstrtos32(buf, 10, &value))                         \
 950                         return -EINVAL;                                 \
 951                                                                         \
 952                 tz->tzp->name = value;                                  \
 953                                                                         \
 954                 return count;                                           \
 955         }                                                               \
 956         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
 957
 958 create_s32_tzp_attr(k_po);
 959 create_s32_tzp_attr(k_pu);
 960 create_s32_tzp_attr(k_i);
 961 create_s32_tzp_attr(k_d);
 962 create_s32_tzp_attr(integral_cutoff);
 963 create_s32_tzp_attr(slope);
 964 create_s32_tzp_attr(offset);
 965 #undef create_s32_tzp_attr
 966
 967 static struct device_attribute *dev_tzp_attrs[] = {
 968         &dev_attr_sustainable_power,
 969         &dev_attr_k_po,
 970         &dev_attr_k_pu,
 971         &dev_attr_k_i,
 972         &dev_attr_k_d,
 973         &dev_attr_integral_cutoff,
 974         &dev_attr_slope,
 975         &dev_attr_offset,
 976 };
 977
 978 static int create_tzp_attrs(struct device *dev)
 979 {
 980         int i;
 981
 982         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
 983                 int ret;
 984                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
 985
 986                 ret = device_create_file(dev, dev_attr);
 987                 if (ret)
 988                         return ret;
 989         }
 990
 991         return 0;
 992 }
 993
 994 /**
 995  * power_actor_get_max_power() - get the maximum power that a cdev can consume
 996  * @cdev:       pointer to &thermal_cooling_device
 997  * @tz:         a valid thermal zone device pointer
 998  * @max_power:  pointer in which to store the maximum power
 999  *
1000  * Calculate the maximum power consumption in milliwats that the
1001  * cooling device can currently consume and store it in @max_power.
1002  *
1003  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1004  * power_actor API or -E* on other error.
1005  */
1006 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1007                               struct thermal_zone_device *tz, u32 *max_power)
1008 {
1009         if (!cdev_is_power_actor(cdev))
1010                 return -EINVAL;
1011
1012         return cdev->ops->state2power(cdev, tz, 0, max_power);
1013 }
1014
1015 /**
1016  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1017  * @cdev:       pointer to &thermal_cooling_device
1018  * @instance:   thermal instance to update
1019  * @power:      the power in milliwatts
1020  *
1021  * Set the cooling device to consume at most @power milliwatts.
1022  *
1023  * Return: 0 on success, -EINVAL if the cooling device does not
1024  * implement the power actor API or -E* for other failures.
1025  */
1026 int power_actor_set_power(struct thermal_cooling_device *cdev,
1027                           struct thermal_instance *instance, u32 power)
1028 {
1029         unsigned long state;
1030         int ret;
1031
1032         if (!cdev_is_power_actor(cdev))
1033                 return -EINVAL;
1034
1035         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1036         if (ret)
1037                 return ret;
1038
1039         instance->target = state;
1040         cdev->updated = false;
1041         thermal_cdev_update(cdev);
1042
1043         return 0;
1044 }
1045
1046 static DEVICE_ATTR(type, 0444, type_show, NULL);
1047 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1048 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1049 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1050 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1051 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1052
1053 /* sys I/F for cooling device */
1054 #define to_cooling_device(_dev) \
1055         container_of(_dev, struct thermal_cooling_device, device)
1056
1057 static ssize_t
1058 thermal_cooling_device_type_show(struct device *dev,
1059                                  struct device_attribute *attr, char *buf)
1060 {
1061         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1062
1063         return sprintf(buf, "%s\n", cdev->type);
1064 }
1065
1066 static ssize_t
1067 thermal_cooling_device_max_state_show(struct device *dev,
1068                                       struct device_attribute *attr, char *buf)
1069 {
1070         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1071         unsigned long state;
1072         int ret;
1073
1074         ret = cdev->ops->get_max_state(cdev, &state);
1075         if (ret)
1076                 return ret;
1077         return sprintf(buf, "%ld\n", state);
1078 }
1079
1080 static ssize_t
1081 thermal_cooling_device_cur_state_show(struct device *dev,
1082                                       struct device_attribute *attr, char *buf)
1083 {
1084         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1085         unsigned long state;
1086         int ret;
1087
1088         ret = cdev->ops->get_cur_state(cdev, &state);
1089         if (ret)
1090                 return ret;
1091         return sprintf(buf, "%ld\n", state);
1092 }
1093
1094 static ssize_t
1095 thermal_cooling_device_cur_state_store(struct device *dev,
1096                                        struct device_attribute *attr,
1097                                        const char *buf, size_t count)
1098 {
1099         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1100         unsigned long state;
1101         int result;
1102
1103         if (!sscanf(buf, "%ld\n", &state))
1104                 return -EINVAL;
1105
1106         if ((long)state < 0)
1107                 return -EINVAL;
1108
1109         result = cdev->ops->set_cur_state(cdev, state);
1110         if (result)
1111                 return result;
1112         return count;
1113 }
1114
1115 static struct device_attribute dev_attr_cdev_type =
1116 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1117 static DEVICE_ATTR(max_state, 0444,
1118                    thermal_cooling_device_max_state_show, NULL);
1119 static DEVICE_ATTR(cur_state, 0644,
1120                    thermal_cooling_device_cur_state_show,
1121                    thermal_cooling_device_cur_state_store);
1122
1123 static ssize_t
1124 thermal_cooling_device_trip_point_show(struct device *dev,
1125                                        struct device_attribute *attr, char *buf)
1126 {
1127         struct thermal_instance *instance;
1128
1129         instance =
1130             container_of(attr, struct thermal_instance, attr);
1131
1132         if (instance->trip == THERMAL_TRIPS_NONE)
1133                 return sprintf(buf, "-1\n");
1134         else
1135                 return sprintf(buf, "%d\n", instance->trip);
1136 }
1137
1138 static struct attribute *cooling_device_attrs[] = {
1139         &dev_attr_cdev_type.attr,
1140         &dev_attr_max_state.attr,
1141         &dev_attr_cur_state.attr,
1142         NULL,
1143 };
1144
1145 static const struct attribute_group cooling_device_attr_group = {
1146         .attrs = cooling_device_attrs,
1147 };
1148
1149 static const struct attribute_group *cooling_device_attr_groups[] = {
1150         &cooling_device_attr_group,
1151         NULL,
1152 };
1153
1154 static ssize_t
1155 thermal_cooling_device_weight_show(struct device *dev,
1156                                    struct device_attribute *attr, char *buf)
1157 {
1158         struct thermal_instance *instance;
1159
1160         instance = container_of(attr, struct thermal_instance, weight_attr);
1161
1162         return sprintf(buf, "%d\n", instance->weight);
1163 }
1164
1165 static ssize_t
1166 thermal_cooling_device_weight_store(struct device *dev,
1167                                     struct device_attribute *attr,
1168                                     const char *buf, size_t count)
1169 {
1170         struct thermal_instance *instance;
1171         int ret, weight;
1172
1173         ret = kstrtoint(buf, 0, &weight);
1174         if (ret)
1175                 return ret;
1176
1177         instance = container_of(attr, struct thermal_instance, weight_attr);
1178         instance->weight = weight;
1179
1180         return count;
1181 }
1182 /* Device management */
1183
1184 /**
1185  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1186  * @tz:         pointer to struct thermal_zone_device
1187  * @trip:       indicates which trip point the cooling devices is
1188  *              associated with in this thermal zone.
1189  * @cdev:       pointer to struct thermal_cooling_device
1190  * @upper:      the Maximum cooling state for this trip point.
1191  *              THERMAL_NO_LIMIT means no upper limit,
1192  *              and the cooling device can be in max_state.
1193  * @lower:      the Minimum cooling state can be used for this trip point.
1194  *              THERMAL_NO_LIMIT means no lower limit,
1195  *              and the cooling device can be in cooling state 0.
1196  * @weight:     The weight of the cooling device to be bound to the
1197  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1198  *              default value
1199  *
1200  * This interface function bind a thermal cooling device to the certain trip
1201  * point of a thermal zone device.
1202  * This function is usually called in the thermal zone device .bind callback.
1203  *
1204  * Return: 0 on success, the proper error value otherwise.
1205  */
1206 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1207                                      int trip,
1208                                      struct thermal_cooling_device *cdev,
1209                                      unsigned long upper, unsigned long lower,
1210                                      unsigned int weight)
1211 {
1212         struct thermal_instance *dev;
1213         struct thermal_instance *pos;
1214         struct thermal_zone_device *pos1;
1215         struct thermal_cooling_device *pos2;
1216         unsigned long max_state;
1217         int result, ret;
1218
1219         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1220                 return -EINVAL;
1221
1222         list_for_each_entry(pos1, &thermal_tz_list, node) {
1223                 if (pos1 == tz)
1224                         break;
1225         }
1226         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1227                 if (pos2 == cdev)
1228                         break;
1229         }
1230
1231         if (tz != pos1 || cdev != pos2)
1232                 return -EINVAL;
1233
1234         ret = cdev->ops->get_max_state(cdev, &max_state);
1235         if (ret)
1236                 return ret;
1237
1238         /* lower default 0, upper default max_state */
1239         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1240         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1241
1242         if (lower > upper || upper > max_state)
1243                 return -EINVAL;
1244
1245         dev =
1246             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1247         if (!dev)
1248                 return -ENOMEM;
1249         dev->tz = tz;
1250         dev->cdev = cdev;
1251         dev->trip = trip;
1252         dev->upper = upper;
1253         dev->lower = lower;
1254         dev->target = THERMAL_NO_TARGET;
1255         dev->weight = weight;
1256
1257         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1258         if (result)
1259                 goto free_mem;
1260
1261         sprintf(dev->name, "cdev%d", dev->id);
1262         result =
1263             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1264         if (result)
1265                 goto release_idr;
1266
1267         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1268         sysfs_attr_init(&dev->attr.attr);
1269         dev->attr.attr.name = dev->attr_name;
1270         dev->attr.attr.mode = 0444;
1271         dev->attr.show = thermal_cooling_device_trip_point_show;
1272         result = device_create_file(&tz->device, &dev->attr);
1273         if (result)
1274                 goto remove_symbol_link;
1275
1276         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1277         sysfs_attr_init(&dev->weight_attr.attr);
1278         dev->weight_attr.attr.name = dev->weight_attr_name;
1279         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1280         dev->weight_attr.show = thermal_cooling_device_weight_show;
1281         dev->weight_attr.store = thermal_cooling_device_weight_store;
1282         result = device_create_file(&tz->device, &dev->weight_attr);
1283         if (result)
1284                 goto remove_trip_file;
1285
1286         mutex_lock(&tz->lock);
1287         mutex_lock(&cdev->lock);
1288         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1289             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1290                 result = -EEXIST;
1291                 break;
1292         }
1293         if (!result) {
1294                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1295                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1296         }
1297         mutex_unlock(&cdev->lock);
1298         mutex_unlock(&tz->lock);
1299
1300         if (!result)
1301                 return 0;
1302
1303         device_remove_file(&tz->device, &dev->weight_attr);
1304 remove_trip_file:
1305         device_remove_file(&tz->device, &dev->attr);
1306 remove_symbol_link:
1307         sysfs_remove_link(&tz->device.kobj, dev->name);
1308 release_idr:
1309         release_idr(&tz->idr, &tz->lock, dev->id);
1310 free_mem:
1311         kfree(dev);
1312         return result;
1313 }
1314 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1315
1316 /**
1317  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1318  *                                        thermal zone.
1319  * @tz:         pointer to a struct thermal_zone_device.
1320  * @trip:       indicates which trip point the cooling devices is
1321  *              associated with in this thermal zone.
1322  * @cdev:       pointer to a struct thermal_cooling_device.
1323  *
1324  * This interface function unbind a thermal cooling device from the certain
1325  * trip point of a thermal zone device.
1326  * This function is usually called in the thermal zone device .unbind callback.
1327  *
1328  * Return: 0 on success, the proper error value otherwise.
1329  */
1330 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1331                                        int trip,
1332                                        struct thermal_cooling_device *cdev)
1333 {
1334         struct thermal_instance *pos, *next;
1335
1336         mutex_lock(&tz->lock);
1337         mutex_lock(&cdev->lock);
1338         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1339                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1340                         list_del(&pos->tz_node);
1341                         list_del(&pos->cdev_node);
1342                         mutex_unlock(&cdev->lock);
1343                         mutex_unlock(&tz->lock);
1344                         goto unbind;
1345                 }
1346         }
1347         mutex_unlock(&cdev->lock);
1348         mutex_unlock(&tz->lock);
1349
1350         return -ENODEV;
1351
1352 unbind:
1353         device_remove_file(&tz->device, &pos->attr);
1354         sysfs_remove_link(&tz->device.kobj, pos->name);
1355         release_idr(&tz->idr, &tz->lock, pos->id);
1356         kfree(pos);
1357         return 0;
1358 }
1359 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1360
1361 static void thermal_release(struct device *dev)
1362 {
1363         struct thermal_zone_device *tz;
1364         struct thermal_cooling_device *cdev;
1365
1366         if (!strncmp(dev_name(dev), "thermal_zone",
1367                      sizeof("thermal_zone") - 1)) {
1368                 tz = to_thermal_zone(dev);
1369                 kfree(tz);
1370         } else if(!strncmp(dev_name(dev), "cooling_device",
1371                         sizeof("cooling_device") - 1)){
1372                 cdev = to_cooling_device(dev);
1373                 kfree(cdev);
1374         }
1375 }
1376
1377 static struct class thermal_class = {
1378         .name = "thermal",
1379         .dev_release = thermal_release,
1380 };
1381
1382 /**
1383  * __thermal_cooling_device_register() - register a new thermal cooling device
1384  * @np:         a pointer to a device tree node.
1385  * @type:       the thermal cooling device type.
1386  * @devdata:    device private data.
1387  * @ops:                standard thermal cooling devices callbacks.
1388  *
1389  * This interface function adds a new thermal cooling device (fan/processor/...)
1390  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1391  * to all the thermal zone devices registered at the same time.
1392  * It also gives the opportunity to link the cooling device to a device tree
1393  * node, so that it can be bound to a thermal zone created out of device tree.
1394  *
1395  * Return: a pointer to the created struct thermal_cooling_device or an
1396  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1397  */
1398 static struct thermal_cooling_device *
1399 __thermal_cooling_device_register(struct device_node *np,
1400                                   char *type, void *devdata,
1401                                   const struct thermal_cooling_device_ops *ops)
1402 {
1403         struct thermal_cooling_device *cdev;
1404         int result;
1405
1406         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1407                 return ERR_PTR(-EINVAL);
1408
1409         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1410             !ops->set_cur_state)
1411                 return ERR_PTR(-EINVAL);
1412
1413         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1414         if (!cdev)
1415                 return ERR_PTR(-ENOMEM);
1416
1417         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1418         if (result) {
1419                 kfree(cdev);
1420                 return ERR_PTR(result);
1421         }
1422
1423         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1424         mutex_init(&cdev->lock);
1425         INIT_LIST_HEAD(&cdev->thermal_instances);
1426         cdev->np = np;
1427         cdev->ops = ops;
1428         cdev->updated = false;
1429         cdev->device.class = &thermal_class;
1430         cdev->device.groups = cooling_device_attr_groups;
1431         cdev->devdata = devdata;
1432         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1433         result = device_register(&cdev->device);
1434         if (result) {
1435                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1436                 kfree(cdev);
1437                 return ERR_PTR(result);
1438         }
1439
1440         /* Add 'this' new cdev to the global cdev list */
1441         mutex_lock(&thermal_list_lock);
1442         list_add(&cdev->node, &thermal_cdev_list);
1443         mutex_unlock(&thermal_list_lock);
1444
1445         /* Update binding information for 'this' new cdev */
1446         bind_cdev(cdev);
1447
1448         return cdev;
1449 }
1450
1451 /**
1452  * thermal_cooling_device_register() - register a new thermal cooling device
1453  * @type:       the thermal cooling device type.
1454  * @devdata:    device private data.
1455  * @ops:                standard thermal cooling devices callbacks.
1456  *
1457  * This interface function adds a new thermal cooling device (fan/processor/...)
1458  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1459  * to all the thermal zone devices registered at the same time.
1460  *
1461  * Return: a pointer to the created struct thermal_cooling_device or an
1462  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1463  */
1464 struct thermal_cooling_device *
1465 thermal_cooling_device_register(char *type, void *devdata,
1466                                 const struct thermal_cooling_device_ops *ops)
1467 {
1468         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1469 }
1470 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1471
1472 /**
1473  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1474  * @np:         a pointer to a device tree node.
1475  * @type:       the thermal cooling device type.
1476  * @devdata:    device private data.
1477  * @ops:                standard thermal cooling devices callbacks.
1478  *
1479  * This function will register a cooling device with device tree node reference.
1480  * This interface function adds a new thermal cooling device (fan/processor/...)
1481  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1482  * to all the thermal zone devices registered at the same time.
1483  *
1484  * Return: a pointer to the created struct thermal_cooling_device or an
1485  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1486  */
1487 struct thermal_cooling_device *
1488 thermal_of_cooling_device_register(struct device_node *np,
1489                                    char *type, void *devdata,
1490                                    const struct thermal_cooling_device_ops *ops)
1491 {
1492         return __thermal_cooling_device_register(np, type, devdata, ops);
1493 }
1494 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1495
1496 /**
1497  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1498  * @cdev:       the thermal cooling device to remove.
1499  *
1500  * thermal_cooling_device_unregister() must be called when the device is no
1501  * longer needed.
1502  */
1503 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1504 {
1505         int i;
1506         const struct thermal_zone_params *tzp;
1507         struct thermal_zone_device *tz;
1508         struct thermal_cooling_device *pos = NULL;
1509
1510         if (!cdev)
1511                 return;
1512
1513         mutex_lock(&thermal_list_lock);
1514         list_for_each_entry(pos, &thermal_cdev_list, node)
1515             if (pos == cdev)
1516                 break;
1517         if (pos != cdev) {
1518                 /* thermal cooling device not found */
1519                 mutex_unlock(&thermal_list_lock);
1520                 return;
1521         }
1522         list_del(&cdev->node);
1523
1524         /* Unbind all thermal zones associated with 'this' cdev */
1525         list_for_each_entry(tz, &thermal_tz_list, node) {
1526                 if (tz->ops->unbind) {
1527                         tz->ops->unbind(tz, cdev);
1528                         continue;
1529                 }
1530
1531                 if (!tz->tzp || !tz->tzp->tbp)
1532                         continue;
1533
1534                 tzp = tz->tzp;
1535                 for (i = 0; i < tzp->num_tbps; i++) {
1536                         if (tzp->tbp[i].cdev == cdev) {
1537                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1538                                 tzp->tbp[i].cdev = NULL;
1539                         }
1540                 }
1541         }
1542
1543         mutex_unlock(&thermal_list_lock);
1544
1545         if (cdev->type[0])
1546                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1547         device_remove_file(&cdev->device, &dev_attr_max_state);
1548         device_remove_file(&cdev->device, &dev_attr_cur_state);
1549
1550         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1551         device_unregister(&cdev->device);
1552         return;
1553 }
1554 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1555
1556 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1557 {
1558         struct thermal_instance *instance;
1559         unsigned long target = 0;
1560
1561         /* cooling device is updated*/
1562         if (cdev->updated)
1563                 return;
1564
1565         mutex_lock(&cdev->lock);
1566         /* Make sure cdev enters the deepest cooling state */
1567         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1568                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1569                                 instance->tz->id, instance->target);
1570                 if (instance->target == THERMAL_NO_TARGET)
1571                         continue;
1572                 if (instance->target > target)
1573                         target = instance->target;
1574         }
1575         mutex_unlock(&cdev->lock);
1576         cdev->ops->set_cur_state(cdev, target);
1577         cdev->updated = true;
1578         trace_cdev_update(cdev, target);
1579         dev_dbg(&cdev->device, "set to state %lu\n", target);
1580 }
1581 EXPORT_SYMBOL(thermal_cdev_update);
1582
1583 /**
1584  * thermal_notify_framework - Sensor drivers use this API to notify framework
1585  * @tz:         thermal zone device
1586  * @trip:       indicates which trip point has been crossed
1587  *
1588  * This function handles the trip events from sensor drivers. It starts
1589  * throttling the cooling devices according to the policy configured.
1590  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1591  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1592  * The throttling policy is based on the configured platform data; if no
1593  * platform data is provided, this uses the step_wise throttling policy.
1594  */
1595 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1596 {
1597         handle_thermal_trip(tz, trip);
1598 }
1599 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1600
1601 /**
1602  * create_trip_attrs() - create attributes for trip points
1603  * @tz:         the thermal zone device
1604  * @mask:       Writeable trip point bitmap.
1605  *
1606  * helper function to instantiate sysfs entries for every trip
1607  * point and its properties of a struct thermal_zone_device.
1608  *
1609  * Return: 0 on success, the proper error value otherwise.
1610  */
1611 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1612 {
1613         int indx;
1614         int size = sizeof(struct thermal_attr) * tz->trips;
1615
1616         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1617         if (!tz->trip_type_attrs)
1618                 return -ENOMEM;
1619
1620         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1621         if (!tz->trip_temp_attrs) {
1622                 kfree(tz->trip_type_attrs);
1623                 return -ENOMEM;
1624         }
1625
1626         if (tz->ops->get_trip_hyst) {
1627                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1628                 if (!tz->trip_hyst_attrs) {
1629                         kfree(tz->trip_type_attrs);
1630                         kfree(tz->trip_temp_attrs);
1631                         return -ENOMEM;
1632                 }
1633         }
1634
1635
1636         for (indx = 0; indx < tz->trips; indx++) {
1637                 /* create trip type attribute */
1638                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1639                          "trip_point_%d_type", indx);
1640
1641                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1642                 tz->trip_type_attrs[indx].attr.attr.name =
1643                                                 tz->trip_type_attrs[indx].name;
1644                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1645                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1646
1647                 device_create_file(&tz->device,
1648                                    &tz->trip_type_attrs[indx].attr);
1649
1650                 /* create trip temp attribute */
1651                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1652                          "trip_point_%d_temp", indx);
1653
1654                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1655                 tz->trip_temp_attrs[indx].attr.attr.name =
1656                                                 tz->trip_temp_attrs[indx].name;
1657                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1658                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1659                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1660                     mask & (1 << indx)) {
1661                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1662                         tz->trip_temp_attrs[indx].attr.store =
1663                                                         trip_point_temp_store;
1664                 }
1665
1666                 device_create_file(&tz->device,
1667                                    &tz->trip_temp_attrs[indx].attr);
1668
1669                 /* create Optional trip hyst attribute */
1670                 if (!tz->ops->get_trip_hyst)
1671                         continue;
1672                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1673                          "trip_point_%d_hyst", indx);
1674
1675                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1676                 tz->trip_hyst_attrs[indx].attr.attr.name =
1677                                         tz->trip_hyst_attrs[indx].name;
1678                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1679                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1680                 if (tz->ops->set_trip_hyst) {
1681                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1682                         tz->trip_hyst_attrs[indx].attr.store =
1683                                         trip_point_hyst_store;
1684                 }
1685
1686                 device_create_file(&tz->device,
1687                                    &tz->trip_hyst_attrs[indx].attr);
1688         }
1689         return 0;
1690 }
1691
1692 static void remove_trip_attrs(struct thermal_zone_device *tz)
1693 {
1694         int indx;
1695
1696         for (indx = 0; indx < tz->trips; indx++) {
1697                 device_remove_file(&tz->device,
1698                                    &tz->trip_type_attrs[indx].attr);
1699                 device_remove_file(&tz->device,
1700                                    &tz->trip_temp_attrs[indx].attr);
1701                 if (tz->ops->get_trip_hyst)
1702                         device_remove_file(&tz->device,
1703                                   &tz->trip_hyst_attrs[indx].attr);
1704         }
1705         kfree(tz->trip_type_attrs);
1706         kfree(tz->trip_temp_attrs);
1707         kfree(tz->trip_hyst_attrs);
1708 }
1709
1710 /**
1711  * thermal_zone_device_register() - register a new thermal zone device
1712  * @type:       the thermal zone device type
1713  * @trips:      the number of trip points the thermal zone support
1714  * @mask:       a bit string indicating the writeablility of trip points
1715  * @devdata:    private device data
1716  * @ops:        standard thermal zone device callbacks
1717  * @tzp:        thermal zone platform parameters
1718  * @passive_delay: number of milliseconds to wait between polls when
1719  *                 performing passive cooling
1720  * @polling_delay: number of milliseconds to wait between polls when checking
1721  *                 whether trip points have been crossed (0 for interrupt
1722  *                 driven systems)
1723  *
1724  * This interface function adds a new thermal zone device (sensor) to
1725  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1726  * thermal cooling devices registered at the same time.
1727  * thermal_zone_device_unregister() must be called when the device is no
1728  * longer needed. The passive cooling depends on the .get_trend() return value.
1729  *
1730  * Return: a pointer to the created struct thermal_zone_device or an
1731  * in case of error, an ERR_PTR. Caller must check return value with
1732  * IS_ERR*() helpers.
1733  */
1734 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1735         int trips, int mask, void *devdata,
1736         struct thermal_zone_device_ops *ops,
1737         struct thermal_zone_params *tzp,
1738         int passive_delay, int polling_delay)
1739 {
1740         struct thermal_zone_device *tz;
1741         enum thermal_trip_type trip_type;
1742         int result;
1743         int count;
1744         int passive = 0;
1745         struct thermal_governor *governor;
1746
1747         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1748                 return ERR_PTR(-EINVAL);
1749
1750         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1751                 return ERR_PTR(-EINVAL);
1752
1753         if (!ops)
1754                 return ERR_PTR(-EINVAL);
1755
1756         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1757                 return ERR_PTR(-EINVAL);
1758
1759         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1760         if (!tz)
1761                 return ERR_PTR(-ENOMEM);
1762
1763         INIT_LIST_HEAD(&tz->thermal_instances);
1764         idr_init(&tz->idr);
1765         mutex_init(&tz->lock);
1766         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1767         if (result) {
1768                 kfree(tz);
1769                 return ERR_PTR(result);
1770         }
1771
1772         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1773         tz->ops = ops;
1774         tz->tzp = tzp;
1775         tz->device.class = &thermal_class;
1776         tz->devdata = devdata;
1777         tz->trips = trips;
1778         tz->passive_delay = passive_delay;
1779         tz->polling_delay = polling_delay;
1780
1781         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1782         result = device_register(&tz->device);
1783         if (result) {
1784                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1785                 kfree(tz);
1786                 return ERR_PTR(result);
1787         }
1788
1789         /* sys I/F */
1790         if (type) {
1791                 result = device_create_file(&tz->device, &dev_attr_type);
1792                 if (result)
1793                         goto unregister;
1794         }
1795
1796         result = device_create_file(&tz->device, &dev_attr_temp);
1797         if (result)
1798                 goto unregister;
1799
1800         if (ops->get_mode) {
1801                 result = device_create_file(&tz->device, &dev_attr_mode);
1802                 if (result)
1803                         goto unregister;
1804         }
1805
1806         result = create_trip_attrs(tz, mask);
1807         if (result)
1808                 goto unregister;
1809
1810         for (count = 0; count < trips; count++) {
1811                 tz->ops->get_trip_type(tz, count, &trip_type);
1812                 if (trip_type == THERMAL_TRIP_PASSIVE)
1813                         passive = 1;
1814         }
1815
1816         if (!passive) {
1817                 result = device_create_file(&tz->device, &dev_attr_passive);
1818                 if (result)
1819                         goto unregister;
1820         }
1821
1822         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1823                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1824                 if (result)
1825                         goto unregister;
1826         }
1827
1828         /* Create policy attribute */
1829         result = device_create_file(&tz->device, &dev_attr_policy);
1830         if (result)
1831                 goto unregister;
1832
1833         /* Add thermal zone params */
1834         result = create_tzp_attrs(&tz->device);
1835         if (result)
1836                 goto unregister;
1837
1838         /* Create available_policies attribute */
1839         result = device_create_file(&tz->device, &dev_attr_available_policies);
1840         if (result)
1841                 goto unregister;
1842
1843         /* Update 'this' zone's governor information */
1844         mutex_lock(&thermal_governor_lock);
1845
1846         if (tz->tzp)
1847                 governor = __find_governor(tz->tzp->governor_name);
1848         else
1849                 governor = def_governor;
1850
1851         result = thermal_set_governor(tz, governor);
1852         if (result) {
1853                 mutex_unlock(&thermal_governor_lock);
1854                 goto unregister;
1855         }
1856
1857         mutex_unlock(&thermal_governor_lock);
1858
1859         if (!tz->tzp || !tz->tzp->no_hwmon) {
1860                 result = thermal_add_hwmon_sysfs(tz);
1861                 if (result)
1862                         goto unregister;
1863         }
1864
1865         mutex_lock(&thermal_list_lock);
1866         list_add_tail(&tz->node, &thermal_tz_list);
1867         mutex_unlock(&thermal_list_lock);
1868
1869         /* Bind cooling devices for this zone */
1870         bind_tz(tz);
1871
1872         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1873
1874         thermal_zone_device_update(tz);
1875
1876         return tz;
1877
1878 unregister:
1879         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1880         device_unregister(&tz->device);
1881         return ERR_PTR(result);
1882 }
1883 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1884
1885 /**
1886  * thermal_device_unregister - removes the registered thermal zone device
1887  * @tz: the thermal zone device to remove
1888  */
1889 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1890 {
1891         int i;
1892         const struct thermal_zone_params *tzp;
1893         struct thermal_cooling_device *cdev;
1894         struct thermal_zone_device *pos = NULL;
1895
1896         if (!tz)
1897                 return;
1898
1899         tzp = tz->tzp;
1900
1901         mutex_lock(&thermal_list_lock);
1902         list_for_each_entry(pos, &thermal_tz_list, node)
1903             if (pos == tz)
1904                 break;
1905         if (pos != tz) {
1906                 /* thermal zone device not found */
1907                 mutex_unlock(&thermal_list_lock);
1908                 return;
1909         }
1910         list_del(&tz->node);
1911
1912         /* Unbind all cdevs associated with 'this' thermal zone */
1913         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1914                 if (tz->ops->unbind) {
1915                         tz->ops->unbind(tz, cdev);
1916                         continue;
1917                 }
1918
1919                 if (!tzp || !tzp->tbp)
1920                         break;
1921
1922                 for (i = 0; i < tzp->num_tbps; i++) {
1923                         if (tzp->tbp[i].cdev == cdev) {
1924                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1925                                 tzp->tbp[i].cdev = NULL;
1926                         }
1927                 }
1928         }
1929
1930         mutex_unlock(&thermal_list_lock);
1931
1932         thermal_zone_device_set_polling(tz, 0);
1933
1934         if (tz->type[0])
1935                 device_remove_file(&tz->device, &dev_attr_type);
1936         device_remove_file(&tz->device, &dev_attr_temp);
1937         if (tz->ops->get_mode)
1938                 device_remove_file(&tz->device, &dev_attr_mode);
1939         device_remove_file(&tz->device, &dev_attr_policy);
1940         device_remove_file(&tz->device, &dev_attr_available_policies);
1941         remove_trip_attrs(tz);
1942         thermal_set_governor(tz, NULL);
1943
1944         thermal_remove_hwmon_sysfs(tz);
1945         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1946         idr_destroy(&tz->idr);
1947         mutex_destroy(&tz->lock);
1948         device_unregister(&tz->device);
1949         return;
1950 }
1951 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1952
1953 /**
1954  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1955  * @name: thermal zone name to fetch the temperature
1956  *
1957  * When only one zone is found with the passed name, returns a reference to it.
1958  *
1959  * Return: On success returns a reference to an unique thermal zone with
1960  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1961  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1962  */
1963 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1964 {
1965         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1966         unsigned int found = 0;
1967
1968         if (!name)
1969                 goto exit;
1970
1971         mutex_lock(&thermal_list_lock);
1972         list_for_each_entry(pos, &thermal_tz_list, node)
1973                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1974                         found++;
1975                         ref = pos;
1976                 }
1977         mutex_unlock(&thermal_list_lock);
1978
1979         /* nothing has been found, thus an error code for it */
1980         if (found == 0)
1981                 ref = ERR_PTR(-ENODEV);
1982         else if (found > 1)
1983         /* Success only when an unique zone is found */
1984                 ref = ERR_PTR(-EEXIST);
1985
1986 exit:
1987         return ref;
1988 }
1989 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1990
1991 #ifdef CONFIG_NET
1992 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1993         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1994 };
1995
1996 static struct genl_family thermal_event_genl_family = {
1997         .id = GENL_ID_GENERATE,
1998         .name = THERMAL_GENL_FAMILY_NAME,
1999         .version = THERMAL_GENL_VERSION,
2000         .maxattr = THERMAL_GENL_ATTR_MAX,
2001         .mcgrps = thermal_event_mcgrps,
2002         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2003 };
2004
2005 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2006                                         enum events event)
2007 {
2008         struct sk_buff *skb;
2009         struct nlattr *attr;
2010         struct thermal_genl_event *thermal_event;
2011         void *msg_header;
2012         int size;
2013         int result;
2014         static unsigned int thermal_event_seqnum;
2015
2016         if (!tz)
2017                 return -EINVAL;
2018
2019         /* allocate memory */
2020         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2021                nla_total_size(0);
2022
2023         skb = genlmsg_new(size, GFP_ATOMIC);
2024         if (!skb)
2025                 return -ENOMEM;
2026
2027         /* add the genetlink message header */
2028         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2029                                  &thermal_event_genl_family, 0,
2030                                  THERMAL_GENL_CMD_EVENT);
2031         if (!msg_header) {
2032                 nlmsg_free(skb);
2033                 return -ENOMEM;
2034         }
2035
2036         /* fill the data */
2037         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2038                            sizeof(struct thermal_genl_event));
2039
2040         if (!attr) {
2041                 nlmsg_free(skb);
2042                 return -EINVAL;
2043         }
2044
2045         thermal_event = nla_data(attr);
2046         if (!thermal_event) {
2047                 nlmsg_free(skb);
2048                 return -EINVAL;
2049         }
2050
2051         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2052
2053         thermal_event->orig = tz->id;
2054         thermal_event->event = event;
2055
2056         /* send multicast genetlink message */
2057         genlmsg_end(skb, msg_header);
2058
2059         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2060                                    0, GFP_ATOMIC);
2061         if (result)
2062                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2063
2064         return result;
2065 }
2066 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2067
2068 static int genetlink_init(void)
2069 {
2070         return genl_register_family(&thermal_event_genl_family);
2071 }
2072
2073 static void genetlink_exit(void)
2074 {
2075         genl_unregister_family(&thermal_event_genl_family);
2076 }
2077 #else /* !CONFIG_NET */
2078 static inline int genetlink_init(void) { return 0; }
2079 static inline void genetlink_exit(void) {}
2080 #endif /* !CONFIG_NET */
2081
2082 static int __init thermal_register_governors(void)
2083 {
2084         int result;
2085
2086         result = thermal_gov_step_wise_register();
2087         if (result)
2088                 return result;
2089
2090         result = thermal_gov_fair_share_register();
2091         if (result)
2092                 return result;
2093
2094         result = thermal_gov_bang_bang_register();
2095         if (result)
2096                 return result;
2097
2098         result = thermal_gov_user_space_register();
2099         if (result)
2100                 return result;
2101
2102         return thermal_gov_power_allocator_register();
2103 }
2104
2105 static void thermal_unregister_governors(void)
2106 {
2107         thermal_gov_step_wise_unregister();
2108         thermal_gov_fair_share_unregister();
2109         thermal_gov_bang_bang_unregister();
2110         thermal_gov_user_space_unregister();
2111         thermal_gov_power_allocator_unregister();
2112 }
2113
2114 static int __init thermal_init(void)
2115 {
2116         int result;
2117
2118         result = thermal_register_governors();
2119         if (result)
2120                 goto error;
2121
2122         result = class_register(&thermal_class);
2123         if (result)
2124                 goto unregister_governors;
2125
2126         result = genetlink_init();
2127         if (result)
2128                 goto unregister_class;
2129
2130         result = of_parse_thermal_zones();
2131         if (result)
2132                 goto exit_netlink;
2133
2134         return 0;
2135
2136 exit_netlink:
2137         genetlink_exit();
2138 unregister_class:
2139         class_unregister(&thermal_class);
2140 unregister_governors:
2141         thermal_unregister_governors();
2142 error:
2143         idr_destroy(&thermal_tz_idr);
2144         idr_destroy(&thermal_cdev_idr);
2145         mutex_destroy(&thermal_idr_lock);
2146         mutex_destroy(&thermal_list_lock);
2147         mutex_destroy(&thermal_governor_lock);
2148         return result;
2149 }
2150
2151 static void __exit thermal_exit(void)
2152 {
2153         of_thermal_destroy_zones();
2154         genetlink_exit();
2155         class_unregister(&thermal_class);
2156         thermal_unregister_governors();
2157         idr_destroy(&thermal_tz_idr);
2158         idr_destroy(&thermal_cdev_idr);
2159         mutex_destroy(&thermal_idr_lock);
2160         mutex_destroy(&thermal_list_lock);
2161         mutex_destroy(&thermal_governor_lock);
2162 }
2163
2164 fs_initcall(thermal_init);
2165 module_exit(thermal_exit);