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 #include <linux/suspend.h>
  41
  42 #define CREATE_TRACE_POINTS
  43 #include <trace/events/thermal.h>
  44
  45 #include "thermal_core.h"
  46 #include "thermal_hwmon.h"
  47
  48 MODULE_AUTHOR("Zhang Rui");
  49 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  50 MODULE_LICENSE("GPL v2");
  51
  52 static DEFINE_IDR(thermal_tz_idr);
  53 static DEFINE_IDR(thermal_cdev_idr);
  54 static DEFINE_MUTEX(thermal_idr_lock);
  55
  56 static LIST_HEAD(thermal_tz_list);
  57 static LIST_HEAD(thermal_cdev_list);
  58 static LIST_HEAD(thermal_governor_list);
  59
  60 static DEFINE_MUTEX(thermal_list_lock);
  61 static DEFINE_MUTEX(thermal_governor_lock);
  62
  63 static atomic_t in_suspend;
  64
  65 static struct thermal_governor *def_governor;
  66
  67 static struct thermal_governor *__find_governor(const char *name)
  68 {
  69         struct thermal_governor *pos;
  70
  71         if (!name || !name[0])
  72                 return def_governor;
  73
  74         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  75                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  76                         return pos;
  77
  78         return NULL;
  79 }
  80
  81 /**
  82  * bind_previous_governor() - bind the previous governor of the thermal zone
  83  * @tz:         a valid pointer to a struct thermal_zone_device
  84  * @failed_gov_name:    the name of the governor that failed to register
  85  *
  86  * Register the previous governor of the thermal zone after a new
  87  * governor has failed to be bound.
  88  */
  89 static void bind_previous_governor(struct thermal_zone_device *tz,
  90                                    const char *failed_gov_name)
  91 {
  92         if (tz->governor && tz->governor->bind_to_tz) {
  93                 if (tz->governor->bind_to_tz(tz)) {
  94                         dev_err(&tz->device,
  95                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  96                                 failed_gov_name, tz->governor->name, tz->type);
  97                         tz->governor = NULL;
  98                 }
  99         }
 100 }
 101
 102 /**
 103  * thermal_set_governor() - Switch to another governor
 104  * @tz:         a valid pointer to a struct thermal_zone_device
 105  * @new_gov:    pointer to the new governor
 106  *
 107  * Change the governor of thermal zone @tz.
 108  *
 109  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
 110  */
 111 static int thermal_set_governor(struct thermal_zone_device *tz,
 112                                 struct thermal_governor *new_gov)
 113 {
 114         int ret = 0;
 115
 116         if (tz->governor && tz->governor->unbind_from_tz)
 117                 tz->governor->unbind_from_tz(tz);
 118
 119         if (new_gov && new_gov->bind_to_tz) {
 120                 ret = new_gov->bind_to_tz(tz);
 121                 if (ret) {
 122                         bind_previous_governor(tz, new_gov->name);
 123
 124                         return ret;
 125                 }
 126         }
 127
 128         tz->governor = new_gov;
 129
 130         return ret;
 131 }
 132
 133 int thermal_register_governor(struct thermal_governor *governor)
 134 {
 135         int err;
 136         const char *name;
 137         struct thermal_zone_device *pos;
 138
 139         if (!governor)
 140                 return -EINVAL;
 141
 142         mutex_lock(&thermal_governor_lock);
 143
 144         err = -EBUSY;
 145         if (__find_governor(governor->name) == NULL) {
 146                 err = 0;
 147                 list_add(&governor->governor_list, &thermal_governor_list);
 148                 if (!def_governor && !strncmp(governor->name,
 149                         DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
 150                         def_governor = governor;
 151         }
 152
 153         mutex_lock(&thermal_list_lock);
 154
 155         list_for_each_entry(pos, &thermal_tz_list, node) {
 156                 /*
 157                  * only thermal zones with specified tz->tzp->governor_name
 158                  * may run with tz->govenor unset
 159                  */
 160                 if (pos->governor)
 161                         continue;
 162
 163                 name = pos->tzp->governor_name;
 164
 165                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 166                         int ret;
 167
 168                         ret = thermal_set_governor(pos, governor);
 169                         if (ret)
 170                                 dev_err(&pos->device,
 171                                         "Failed to set governor %s for thermal zone %s: %d\n",
 172                                         governor->name, pos->type, ret);
 173                 }
 174         }
 175
 176         mutex_unlock(&thermal_list_lock);
 177         mutex_unlock(&thermal_governor_lock);
 178
 179         return err;
 180 }
 181
 182 void thermal_unregister_governor(struct thermal_governor *governor)
 183 {
 184         struct thermal_zone_device *pos;
 185
 186         if (!governor)
 187                 return;
 188
 189         mutex_lock(&thermal_governor_lock);
 190
 191         if (__find_governor(governor->name) == NULL)
 192                 goto exit;
 193
 194         mutex_lock(&thermal_list_lock);
 195
 196         list_for_each_entry(pos, &thermal_tz_list, node) {
 197                 if (!strncasecmp(pos->governor->name, governor->name,
 198                                                 THERMAL_NAME_LENGTH))
 199                         thermal_set_governor(pos, NULL);
 200         }
 201
 202         mutex_unlock(&thermal_list_lock);
 203         list_del(&governor->governor_list);
 204 exit:
 205         mutex_unlock(&thermal_governor_lock);
 206         return;
 207 }
 208
 209 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 210 {
 211         int ret;
 212
 213         if (lock)
 214                 mutex_lock(lock);
 215         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 216         if (lock)
 217                 mutex_unlock(lock);
 218         if (unlikely(ret < 0))
 219                 return ret;
 220         *id = ret;
 221         return 0;
 222 }
 223
 224 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 225 {
 226         if (lock)
 227                 mutex_lock(lock);
 228         idr_remove(idr, id);
 229         if (lock)
 230                 mutex_unlock(lock);
 231 }
 232
 233 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 234 {
 235         enum thermal_trend trend;
 236
 237         if (tz->emul_temperature || !tz->ops->get_trend ||
 238             tz->ops->get_trend(tz, trip, &trend)) {
 239                 if (tz->temperature > tz->last_temperature)
 240                         trend = THERMAL_TREND_RAISING;
 241                 else if (tz->temperature < tz->last_temperature)
 242                         trend = THERMAL_TREND_DROPPING;
 243                 else
 244                         trend = THERMAL_TREND_STABLE;
 245         }
 246
 247         return trend;
 248 }
 249 EXPORT_SYMBOL(get_tz_trend);
 250
 251 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 252                         struct thermal_cooling_device *cdev, int trip)
 253 {
 254         struct thermal_instance *pos = NULL;
 255         struct thermal_instance *target_instance = NULL;
 256
 257         mutex_lock(&tz->lock);
 258         mutex_lock(&cdev->lock);
 259
 260         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 261                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 262                         target_instance = pos;
 263                         break;
 264                 }
 265         }
 266
 267         mutex_unlock(&cdev->lock);
 268         mutex_unlock(&tz->lock);
 269
 270         return target_instance;
 271 }
 272 EXPORT_SYMBOL(get_thermal_instance);
 273
 274 static void print_bind_err_msg(struct thermal_zone_device *tz,
 275                         struct thermal_cooling_device *cdev, int ret)
 276 {
 277         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 278                                 tz->type, cdev->type, ret);
 279 }
 280
 281 static void __bind(struct thermal_zone_device *tz, int mask,
 282                         struct thermal_cooling_device *cdev,
 283                         unsigned long *limits,
 284                         unsigned int weight)
 285 {
 286         int i, ret;
 287
 288         for (i = 0; i < tz->trips; i++) {
 289                 if (mask & (1 << i)) {
 290                         unsigned long upper, lower;
 291
 292                         upper = THERMAL_NO_LIMIT;
 293                         lower = THERMAL_NO_LIMIT;
 294                         if (limits) {
 295                                 lower = limits[i * 2];
 296                                 upper = limits[i * 2 + 1];
 297                         }
 298                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 299                                                                upper, lower,
 300                                                                weight);
 301                         if (ret)
 302                                 print_bind_err_msg(tz, cdev, ret);
 303                 }
 304         }
 305 }
 306
 307 static void __unbind(struct thermal_zone_device *tz, int mask,
 308                         struct thermal_cooling_device *cdev)
 309 {
 310         int i;
 311
 312         for (i = 0; i < tz->trips; i++)
 313                 if (mask & (1 << i))
 314                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 315 }
 316
 317 static void bind_cdev(struct thermal_cooling_device *cdev)
 318 {
 319         int i, ret;
 320         const struct thermal_zone_params *tzp;
 321         struct thermal_zone_device *pos = NULL;
 322
 323         mutex_lock(&thermal_list_lock);
 324
 325         list_for_each_entry(pos, &thermal_tz_list, node) {
 326                 if (!pos->tzp && !pos->ops->bind)
 327                         continue;
 328
 329                 if (pos->ops->bind) {
 330                         ret = pos->ops->bind(pos, cdev);
 331                         if (ret)
 332                                 print_bind_err_msg(pos, cdev, ret);
 333                         continue;
 334                 }
 335
 336                 tzp = pos->tzp;
 337                 if (!tzp || !tzp->tbp)
 338                         continue;
 339
 340                 for (i = 0; i < tzp->num_tbps; i++) {
 341                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 342                                 continue;
 343                         if (tzp->tbp[i].match(pos, cdev))
 344                                 continue;
 345                         tzp->tbp[i].cdev = cdev;
 346                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 347                                tzp->tbp[i].binding_limits,
 348                                tzp->tbp[i].weight);
 349                 }
 350         }
 351
 352         mutex_unlock(&thermal_list_lock);
 353 }
 354
 355 static void bind_tz(struct thermal_zone_device *tz)
 356 {
 357         int i, ret;
 358         struct thermal_cooling_device *pos = NULL;
 359         const struct thermal_zone_params *tzp = tz->tzp;
 360
 361         if (!tzp && !tz->ops->bind)
 362                 return;
 363
 364         mutex_lock(&thermal_list_lock);
 365
 366         /* If there is ops->bind, try to use ops->bind */
 367         if (tz->ops->bind) {
 368                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 369                         ret = tz->ops->bind(tz, pos);
 370                         if (ret)
 371                                 print_bind_err_msg(tz, pos, ret);
 372                 }
 373                 goto exit;
 374         }
 375
 376         if (!tzp || !tzp->tbp)
 377                 goto exit;
 378
 379         list_for_each_entry(pos, &thermal_cdev_list, node) {
 380                 for (i = 0; i < tzp->num_tbps; i++) {
 381                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 382                                 continue;
 383                         if (tzp->tbp[i].match(tz, pos))
 384                                 continue;
 385                         tzp->tbp[i].cdev = pos;
 386                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 387                                tzp->tbp[i].binding_limits,
 388                                tzp->tbp[i].weight);
 389                 }
 390         }
 391 exit:
 392         mutex_unlock(&thermal_list_lock);
 393 }
 394
 395 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 396                                             int delay)
 397 {
 398         if (delay > 1000)
 399                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 400                                  round_jiffies(msecs_to_jiffies(delay)));
 401         else if (delay)
 402                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 403                                  msecs_to_jiffies(delay));
 404         else
 405                 cancel_delayed_work(&tz->poll_queue);
 406 }
 407
 408 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 409 {
 410         mutex_lock(&tz->lock);
 411
 412         if (tz->passive)
 413                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 414         else if (tz->polling_delay)
 415                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 416         else
 417                 thermal_zone_device_set_polling(tz, 0);
 418
 419         mutex_unlock(&tz->lock);
 420 }
 421
 422 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 423                         int trip, enum thermal_trip_type trip_type)
 424 {
 425         tz->governor ? tz->governor->throttle(tz, trip) :
 426                        def_governor->throttle(tz, trip);
 427 }
 428
 429 static void handle_critical_trips(struct thermal_zone_device *tz,
 430                                 int trip, enum thermal_trip_type trip_type)
 431 {
 432         int trip_temp;
 433
 434         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 435
 436         /* If we have not crossed the trip_temp, we do not care. */
 437         if (trip_temp <= 0 || tz->temperature < trip_temp)
 438                 return;
 439
 440         trace_thermal_zone_trip(tz, trip, trip_type);
 441
 442         if (tz->ops->notify)
 443                 tz->ops->notify(tz, trip, trip_type);
 444
 445         if (trip_type == THERMAL_TRIP_CRITICAL) {
 446                 dev_emerg(&tz->device,
 447                           "critical temperature reached(%d C),shutting down\n",
 448                           tz->temperature / 1000);
 449                 orderly_poweroff(true);
 450         }
 451 }
 452
 453 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 454 {
 455         enum thermal_trip_type type;
 456
 457         /* Ignore disabled trip points */
 458         if (test_bit(trip, &tz->trips_disabled))
 459                 return;
 460
 461         tz->ops->get_trip_type(tz, trip, &type);
 462
 463         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 464                 handle_critical_trips(tz, trip, type);
 465         else
 466                 handle_non_critical_trips(tz, trip, type);
 467         /*
 468          * Alright, we handled this trip successfully.
 469          * So, start monitoring again.
 470          */
 471         monitor_thermal_zone(tz);
 472 }
 473
 474 /**
 475  * thermal_zone_get_temp() - returns the temperature of a thermal zone
 476  * @tz: a valid pointer to a struct thermal_zone_device
 477  * @temp: a valid pointer to where to store the resulting temperature.
 478  *
 479  * When a valid thermal zone reference is passed, it will fetch its
 480  * temperature and fill @temp.
 481  *
 482  * Return: On success returns 0, an error code otherwise
 483  */
 484 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 485 {
 486         int ret = -EINVAL;
 487         int count;
 488         int crit_temp = INT_MAX;
 489         enum thermal_trip_type type;
 490
 491         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 492                 goto exit;
 493
 494         mutex_lock(&tz->lock);
 495
 496         ret = tz->ops->get_temp(tz, temp);
 497
 498         if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 499                 for (count = 0; count < tz->trips; count++) {
 500                         ret = tz->ops->get_trip_type(tz, count, &type);
 501                         if (!ret && type == THERMAL_TRIP_CRITICAL) {
 502                                 ret = tz->ops->get_trip_temp(tz, count,
 503                                                 &crit_temp);
 504                                 break;
 505                         }
 506                 }
 507
 508                 /*
 509                  * Only allow emulating a temperature when the real temperature
 510                  * is below the critical temperature so that the emulation code
 511                  * cannot hide critical conditions.
 512                  */
 513                 if (!ret && *temp < crit_temp)
 514                         *temp = tz->emul_temperature;
 515         }
 516
 517         mutex_unlock(&tz->lock);
 518 exit:
 519         return ret;
 520 }
 521 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 522
 523 void thermal_zone_set_trips(struct thermal_zone_device *tz)
 524 {
 525         int low = -INT_MAX;
 526         int high = INT_MAX;
 527         int trip_temp, hysteresis;
 528         int i, ret;
 529
 530         mutex_lock(&tz->lock);
 531
 532         if (!tz->ops->set_trips || !tz->ops->get_trip_hyst)
 533                 goto exit;
 534
 535         for (i = 0; i < tz->trips; i++) {
 536                 int trip_low;
 537
 538                 tz->ops->get_trip_temp(tz, i, &trip_temp);
 539                 tz->ops->get_trip_hyst(tz, i, &hysteresis);
 540
 541                 trip_low = trip_temp - hysteresis;
 542
 543                 if (trip_low < tz->temperature && trip_low > low)
 544                         low = trip_low;
 545
 546                 if (trip_temp > tz->temperature && trip_temp < high)
 547                         high = trip_temp;
 548         }
 549
 550         /* No need to change trip points */
 551         if (tz->prev_low_trip == low && tz->prev_high_trip == high)
 552                 goto exit;
 553
 554         tz->prev_low_trip = low;
 555         tz->prev_high_trip = high;
 556
 557         dev_dbg(&tz->device,
 558                 "new temperature boundaries: %d < x < %d\n", low, high);
 559
 560         /*
 561          * Set a temperature window. When this window is left the driver
 562          * must inform the thermal core via thermal_zone_device_update.
 563          */
 564         ret = tz->ops->set_trips(tz, low, high);
 565         if (ret)
 566                 dev_err(&tz->device, "Failed to set trips: %d\n", ret);
 567
 568 exit:
 569         mutex_unlock(&tz->lock);
 570 }
 571 EXPORT_SYMBOL_GPL(thermal_zone_set_trips);
 572
 573 static void update_temperature(struct thermal_zone_device *tz)
 574 {
 575         int temp, ret;
 576
 577         ret = thermal_zone_get_temp(tz, &temp);
 578         if (ret) {
 579                 if (ret != -EAGAIN)
 580                         dev_warn(&tz->device,
 581                                  "failed to read out thermal zone (%d)\n",
 582                                  ret);
 583                 return;
 584         }
 585
 586         mutex_lock(&tz->lock);
 587         tz->last_temperature = tz->temperature;
 588         tz->temperature = temp;
 589         mutex_unlock(&tz->lock);
 590
 591         trace_thermal_temperature(tz);
 592         if (tz->last_temperature == THERMAL_TEMP_INVALID)
 593                 dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
 594                         tz->temperature);
 595         else
 596                 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 597                         tz->last_temperature, tz->temperature);
 598 }
 599
 600 static void thermal_zone_device_init(struct thermal_zone_device *tz)
 601 {
 602         struct thermal_instance *pos;
 603         tz->temperature = THERMAL_TEMP_INVALID;
 604         tz->prev_low_trip = -INT_MAX;
 605         tz->prev_high_trip = INT_MAX;
 606         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 607                 pos->initialized = false;
 608 }
 609
 610 static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 611 {
 612         tz->passive = 0;
 613         thermal_zone_device_init(tz);
 614 }
 615
 616 void thermal_zone_device_update(struct thermal_zone_device *tz,
 617                                 enum thermal_notify_event event)
 618 {
 619         int count;
 620
 621         if (atomic_read(&in_suspend))
 622                 return;
 623
 624         if (!tz->ops->get_temp)
 625                 return;
 626
 627         update_temperature(tz);
 628
 629         thermal_zone_set_trips(tz);
 630
 631         tz->notify_event = event;
 632
 633         for (count = 0; count < tz->trips; count++)
 634                 handle_thermal_trip(tz, count);
 635 }
 636 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 637
 638 static void thermal_zone_device_check(struct work_struct *work)
 639 {
 640         struct thermal_zone_device *tz = container_of(work, struct
 641                                                       thermal_zone_device,
 642                                                       poll_queue.work);
 643         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 644 }
 645
 646 /* sys I/F for thermal zone */
 647
 648 #define to_thermal_zone(_dev) \
 649         container_of(_dev, struct thermal_zone_device, device)
 650
 651 static ssize_t
 652 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 653 {
 654         struct thermal_zone_device *tz = to_thermal_zone(dev);
 655
 656         return sprintf(buf, "%s\n", tz->type);
 657 }
 658
 659 static ssize_t
 660 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 661 {
 662         struct thermal_zone_device *tz = to_thermal_zone(dev);
 663         int temperature, ret;
 664
 665         ret = thermal_zone_get_temp(tz, &temperature);
 666
 667         if (ret)
 668                 return ret;
 669
 670         return sprintf(buf, "%d\n", temperature);
 671 }
 672
 673 static ssize_t
 674 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 675 {
 676         struct thermal_zone_device *tz = to_thermal_zone(dev);
 677         enum thermal_device_mode mode;
 678         int result;
 679
 680         if (!tz->ops->get_mode)
 681                 return -EPERM;
 682
 683         result = tz->ops->get_mode(tz, &mode);
 684         if (result)
 685                 return result;
 686
 687         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 688                        : "disabled");
 689 }
 690
 691 static ssize_t
 692 mode_store(struct device *dev, struct device_attribute *attr,
 693            const char *buf, size_t count)
 694 {
 695         struct thermal_zone_device *tz = to_thermal_zone(dev);
 696         int result;
 697
 698         if (!tz->ops->set_mode)
 699                 return -EPERM;
 700
 701         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 702                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 703         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 704                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 705         else
 706                 result = -EINVAL;
 707
 708         if (result)
 709                 return result;
 710
 711         return count;
 712 }
 713
 714 static ssize_t
 715 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 716                      char *buf)
 717 {
 718         struct thermal_zone_device *tz = to_thermal_zone(dev);
 719         enum thermal_trip_type type;
 720         int trip, result;
 721
 722         if (!tz->ops->get_trip_type)
 723                 return -EPERM;
 724
 725         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 726                 return -EINVAL;
 727
 728         result = tz->ops->get_trip_type(tz, trip, &type);
 729         if (result)
 730                 return result;
 731
 732         switch (type) {
 733         case THERMAL_TRIP_CRITICAL:
 734                 return sprintf(buf, "critical\n");
 735         case THERMAL_TRIP_HOT:
 736                 return sprintf(buf, "hot\n");
 737         case THERMAL_TRIP_PASSIVE:
 738                 return sprintf(buf, "passive\n");
 739         case THERMAL_TRIP_ACTIVE:
 740                 return sprintf(buf, "active\n");
 741         default:
 742                 return sprintf(buf, "unknown\n");
 743         }
 744 }
 745
 746 static ssize_t
 747 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 748                      const char *buf, size_t count)
 749 {
 750         struct thermal_zone_device *tz = to_thermal_zone(dev);
 751         int trip, ret;
 752         int temperature;
 753
 754         if (!tz->ops->set_trip_temp)
 755                 return -EPERM;
 756
 757         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 758                 return -EINVAL;
 759
 760         if (kstrtoint(buf, 10, &temperature))
 761                 return -EINVAL;
 762
 763         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 764         if (ret)
 765                 return ret;
 766
 767         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 768
 769         return count;
 770 }
 771
 772 static ssize_t
 773 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 774                      char *buf)
 775 {
 776         struct thermal_zone_device *tz = to_thermal_zone(dev);
 777         int trip, ret;
 778         int temperature;
 779
 780         if (!tz->ops->get_trip_temp)
 781                 return -EPERM;
 782
 783         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 784                 return -EINVAL;
 785
 786         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 787
 788         if (ret)
 789                 return ret;
 790
 791         return sprintf(buf, "%d\n", temperature);
 792 }
 793
 794 static ssize_t
 795 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 796                         const char *buf, size_t count)
 797 {
 798         struct thermal_zone_device *tz = to_thermal_zone(dev);
 799         int trip, ret;
 800         int temperature;
 801
 802         if (!tz->ops->set_trip_hyst)
 803                 return -EPERM;
 804
 805         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 806                 return -EINVAL;
 807
 808         if (kstrtoint(buf, 10, &temperature))
 809                 return -EINVAL;
 810
 811         /*
 812          * We are not doing any check on the 'temperature' value
 813          * here. The driver implementing 'set_trip_hyst' has to
 814          * take care of this.
 815          */
 816         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 817
 818         if (!ret)
 819                 thermal_zone_set_trips(tz);
 820
 821         return ret ? ret : count;
 822 }
 823
 824 static ssize_t
 825 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 826                         char *buf)
 827 {
 828         struct thermal_zone_device *tz = to_thermal_zone(dev);
 829         int trip, ret;
 830         int temperature;
 831
 832         if (!tz->ops->get_trip_hyst)
 833                 return -EPERM;
 834
 835         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 836                 return -EINVAL;
 837
 838         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 839
 840         return ret ? ret : sprintf(buf, "%d\n", temperature);
 841 }
 842
 843 static ssize_t
 844 passive_store(struct device *dev, struct device_attribute *attr,
 845                     const char *buf, size_t count)
 846 {
 847         struct thermal_zone_device *tz = to_thermal_zone(dev);
 848         struct thermal_cooling_device *cdev = NULL;
 849         int state;
 850
 851         if (!sscanf(buf, "%d\n", &state))
 852                 return -EINVAL;
 853
 854         /* sanity check: values below 1000 millicelcius don't make sense
 855          * and can cause the system to go into a thermal heart attack
 856          */
 857         if (state && state < 1000)
 858                 return -EINVAL;
 859
 860         if (state && !tz->forced_passive) {
 861                 mutex_lock(&thermal_list_lock);
 862                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 863                         if (!strncmp("Processor", cdev->type,
 864                                      sizeof("Processor")))
 865                                 thermal_zone_bind_cooling_device(tz,
 866                                                 THERMAL_TRIPS_NONE, cdev,
 867                                                 THERMAL_NO_LIMIT,
 868                                                 THERMAL_NO_LIMIT,
 869                                                 THERMAL_WEIGHT_DEFAULT);
 870                 }
 871                 mutex_unlock(&thermal_list_lock);
 872                 if (!tz->passive_delay)
 873                         tz->passive_delay = 1000;
 874         } else if (!state && tz->forced_passive) {
 875                 mutex_lock(&thermal_list_lock);
 876                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 877                         if (!strncmp("Processor", cdev->type,
 878                                      sizeof("Processor")))
 879                                 thermal_zone_unbind_cooling_device(tz,
 880                                                                    THERMAL_TRIPS_NONE,
 881                                                                    cdev);
 882                 }
 883                 mutex_unlock(&thermal_list_lock);
 884                 tz->passive_delay = 0;
 885         }
 886
 887         tz->forced_passive = state;
 888
 889         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 890
 891         return count;
 892 }
 893
 894 static ssize_t
 895 passive_show(struct device *dev, struct device_attribute *attr,
 896                    char *buf)
 897 {
 898         struct thermal_zone_device *tz = to_thermal_zone(dev);
 899
 900         return sprintf(buf, "%d\n", tz->forced_passive);
 901 }
 902
 903 static ssize_t
 904 policy_store(struct device *dev, struct device_attribute *attr,
 905                     const char *buf, size_t count)
 906 {
 907         int ret = -EINVAL;
 908         struct thermal_zone_device *tz = to_thermal_zone(dev);
 909         struct thermal_governor *gov;
 910         char name[THERMAL_NAME_LENGTH];
 911
 912         snprintf(name, sizeof(name), "%s", buf);
 913
 914         mutex_lock(&thermal_governor_lock);
 915         mutex_lock(&tz->lock);
 916
 917         gov = __find_governor(strim(name));
 918         if (!gov)
 919                 goto exit;
 920
 921         ret = thermal_set_governor(tz, gov);
 922         if (!ret)
 923                 ret = count;
 924
 925 exit:
 926         mutex_unlock(&tz->lock);
 927         mutex_unlock(&thermal_governor_lock);
 928         return ret;
 929 }
 930
 931 static ssize_t
 932 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 933 {
 934         struct thermal_zone_device *tz = to_thermal_zone(dev);
 935
 936         return sprintf(buf, "%s\n", tz->governor->name);
 937 }
 938
 939 static ssize_t
 940 available_policies_show(struct device *dev, struct device_attribute *devattr,
 941                         char *buf)
 942 {
 943         struct thermal_governor *pos;
 944         ssize_t count = 0;
 945         ssize_t size = PAGE_SIZE;
 946
 947         mutex_lock(&thermal_governor_lock);
 948
 949         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 950                 size = PAGE_SIZE - count;
 951                 count += scnprintf(buf + count, size, "%s ", pos->name);
 952         }
 953         count += scnprintf(buf + count, size, "\n");
 954
 955         mutex_unlock(&thermal_governor_lock);
 956
 957         return count;
 958 }
 959
 960 static ssize_t
 961 emul_temp_store(struct device *dev, struct device_attribute *attr,
 962                      const char *buf, size_t count)
 963 {
 964         struct thermal_zone_device *tz = to_thermal_zone(dev);
 965         int ret = 0;
 966         int temperature;
 967
 968         if (kstrtoint(buf, 10, &temperature))
 969                 return -EINVAL;
 970
 971         if (!tz->ops->set_emul_temp) {
 972                 mutex_lock(&tz->lock);
 973                 tz->emul_temperature = temperature;
 974                 mutex_unlock(&tz->lock);
 975         } else {
 976                 ret = tz->ops->set_emul_temp(tz, temperature);
 977         }
 978
 979         if (!ret)
 980                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 981
 982         return ret ? ret : count;
 983 }
 984 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 985
 986 static ssize_t
 987 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 988                        char *buf)
 989 {
 990         struct thermal_zone_device *tz = to_thermal_zone(dev);
 991
 992         if (tz->tzp)
 993                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 994         else
 995                 return -EIO;
 996 }
 997
 998 static ssize_t
 999 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
1000                         const char *buf, size_t count)
1001 {
1002         struct thermal_zone_device *tz = to_thermal_zone(dev);
1003         u32 sustainable_power;
1004
1005         if (!tz->tzp)
1006                 return -EIO;
1007
1008         if (kstrtou32(buf, 10, &sustainable_power))
1009                 return -EINVAL;
1010
1011         tz->tzp->sustainable_power = sustainable_power;
1012
1013         return count;
1014 }
1015 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
1016                 sustainable_power_store);
1017
1018 #define create_s32_tzp_attr(name)                                       \
1019         static ssize_t                                                  \
1020         name##_show(struct device *dev, struct device_attribute *devattr, \
1021                 char *buf)                                              \
1022         {                                                               \
1023         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
1024                                                                         \
1025         if (tz->tzp)                                                    \
1026                 return sprintf(buf, "%d\n", tz->tzp->name);             \
1027         else                                                            \
1028                 return -EIO;                                            \
1029         }                                                               \
1030                                                                         \
1031         static ssize_t                                                  \
1032         name##_store(struct device *dev, struct device_attribute *devattr, \
1033                 const char *buf, size_t count)                          \
1034         {                                                               \
1035                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
1036                 s32 value;                                              \
1037                                                                         \
1038                 if (!tz->tzp)                                           \
1039                         return -EIO;                                    \
1040                                                                         \
1041                 if (kstrtos32(buf, 10, &value))                         \
1042                         return -EINVAL;                                 \
1043                                                                         \
1044                 tz->tzp->name = value;                                  \
1045                                                                         \
1046                 return count;                                           \
1047         }                                                               \
1048         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
1049
1050 create_s32_tzp_attr(k_po);
1051 create_s32_tzp_attr(k_pu);
1052 create_s32_tzp_attr(k_i);
1053 create_s32_tzp_attr(k_d);
1054 create_s32_tzp_attr(integral_cutoff);
1055 create_s32_tzp_attr(slope);
1056 create_s32_tzp_attr(offset);
1057 #undef create_s32_tzp_attr
1058
1059 static struct device_attribute *dev_tzp_attrs[] = {
1060         &dev_attr_sustainable_power,
1061         &dev_attr_k_po,
1062         &dev_attr_k_pu,
1063         &dev_attr_k_i,
1064         &dev_attr_k_d,
1065         &dev_attr_integral_cutoff,
1066         &dev_attr_slope,
1067         &dev_attr_offset,
1068 };
1069
1070 static int create_tzp_attrs(struct device *dev)
1071 {
1072         int i;
1073
1074         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
1075                 int ret;
1076                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
1077
1078                 ret = device_create_file(dev, dev_attr);
1079                 if (ret)
1080                         return ret;
1081         }
1082
1083         return 0;
1084 }
1085
1086 /**
1087  * power_actor_get_max_power() - get the maximum power that a cdev can consume
1088  * @cdev:       pointer to &thermal_cooling_device
1089  * @tz:         a valid thermal zone device pointer
1090  * @max_power:  pointer in which to store the maximum power
1091  *
1092  * Calculate the maximum power consumption in milliwats that the
1093  * cooling device can currently consume and store it in @max_power.
1094  *
1095  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1096  * power_actor API or -E* on other error.
1097  */
1098 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1099                               struct thermal_zone_device *tz, u32 *max_power)
1100 {
1101         if (!cdev_is_power_actor(cdev))
1102                 return -EINVAL;
1103
1104         return cdev->ops->state2power(cdev, tz, 0, max_power);
1105 }
1106
1107 /**
1108  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
1109  * @cdev:       pointer to &thermal_cooling_device
1110  * @tz:         a valid thermal zone device pointer
1111  * @min_power:  pointer in which to store the minimum power
1112  *
1113  * Calculate the minimum power consumption in milliwatts that the
1114  * cooling device can currently consume and store it in @min_power.
1115  *
1116  * Return: 0 on success, -EINVAL if @cdev doesn't support the
1117  * power_actor API or -E* on other error.
1118  */
1119 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
1120                               struct thermal_zone_device *tz, u32 *min_power)
1121 {
1122         unsigned long max_state;
1123         int ret;
1124
1125         if (!cdev_is_power_actor(cdev))
1126                 return -EINVAL;
1127
1128         ret = cdev->ops->get_max_state(cdev, &max_state);
1129         if (ret)
1130                 return ret;
1131
1132         return cdev->ops->state2power(cdev, tz, max_state, min_power);
1133 }
1134
1135 /**
1136  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1137  * @cdev:       pointer to &thermal_cooling_device
1138  * @instance:   thermal instance to update
1139  * @power:      the power in milliwatts
1140  *
1141  * Set the cooling device to consume at most @power milliwatts.
1142  *
1143  * Return: 0 on success, -EINVAL if the cooling device does not
1144  * implement the power actor API or -E* for other failures.
1145  */
1146 int power_actor_set_power(struct thermal_cooling_device *cdev,
1147                           struct thermal_instance *instance, u32 power)
1148 {
1149         unsigned long state;
1150         int ret;
1151
1152         if (!cdev_is_power_actor(cdev))
1153                 return -EINVAL;
1154
1155         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1156         if (ret)
1157                 return ret;
1158
1159         instance->target = state;
1160         mutex_lock(&cdev->lock);
1161         cdev->updated = false;
1162         mutex_unlock(&cdev->lock);
1163         thermal_cdev_update(cdev);
1164
1165         return 0;
1166 }
1167
1168 static DEVICE_ATTR(type, 0444, type_show, NULL);
1169 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1170 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1171 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1172 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1173 static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
1174
1175 /* sys I/F for cooling device */
1176 #define to_cooling_device(_dev) \
1177         container_of(_dev, struct thermal_cooling_device, device)
1178
1179 static ssize_t
1180 thermal_cooling_device_type_show(struct device *dev,
1181                                  struct device_attribute *attr, char *buf)
1182 {
1183         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1184
1185         return sprintf(buf, "%s\n", cdev->type);
1186 }
1187
1188 static ssize_t
1189 thermal_cooling_device_max_state_show(struct device *dev,
1190                                       struct device_attribute *attr, char *buf)
1191 {
1192         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1193         unsigned long state;
1194         int ret;
1195
1196         ret = cdev->ops->get_max_state(cdev, &state);
1197         if (ret)
1198                 return ret;
1199         return sprintf(buf, "%ld\n", state);
1200 }
1201
1202 static ssize_t
1203 thermal_cooling_device_cur_state_show(struct device *dev,
1204                                       struct device_attribute *attr, char *buf)
1205 {
1206         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1207         unsigned long state;
1208         int ret;
1209
1210         ret = cdev->ops->get_cur_state(cdev, &state);
1211         if (ret)
1212                 return ret;
1213         return sprintf(buf, "%ld\n", state);
1214 }
1215
1216 static ssize_t
1217 thermal_cooling_device_cur_state_store(struct device *dev,
1218                                        struct device_attribute *attr,
1219                                        const char *buf, size_t count)
1220 {
1221         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1222         unsigned long state;
1223         int result;
1224
1225         if (!sscanf(buf, "%ld\n", &state))
1226                 return -EINVAL;
1227
1228         if ((long)state < 0)
1229                 return -EINVAL;
1230
1231         result = cdev->ops->set_cur_state(cdev, state);
1232         if (result)
1233                 return result;
1234         return count;
1235 }
1236
1237 static struct device_attribute dev_attr_cdev_type =
1238 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1239 static DEVICE_ATTR(max_state, 0444,
1240                    thermal_cooling_device_max_state_show, NULL);
1241 static DEVICE_ATTR(cur_state, 0644,
1242                    thermal_cooling_device_cur_state_show,
1243                    thermal_cooling_device_cur_state_store);
1244
1245 static ssize_t
1246 thermal_cooling_device_trip_point_show(struct device *dev,
1247                                        struct device_attribute *attr, char *buf)
1248 {
1249         struct thermal_instance *instance;
1250
1251         instance =
1252             container_of(attr, struct thermal_instance, attr);
1253
1254         if (instance->trip == THERMAL_TRIPS_NONE)
1255                 return sprintf(buf, "-1\n");
1256         else
1257                 return sprintf(buf, "%d\n", instance->trip);
1258 }
1259
1260 static struct attribute *cooling_device_attrs[] = {
1261         &dev_attr_cdev_type.attr,
1262         &dev_attr_max_state.attr,
1263         &dev_attr_cur_state.attr,
1264         NULL,
1265 };
1266
1267 static const struct attribute_group cooling_device_attr_group = {
1268         .attrs = cooling_device_attrs,
1269 };
1270
1271 static const struct attribute_group *cooling_device_attr_groups[] = {
1272         &cooling_device_attr_group,
1273         NULL,
1274 };
1275
1276 static ssize_t
1277 thermal_cooling_device_weight_show(struct device *dev,
1278                                    struct device_attribute *attr, char *buf)
1279 {
1280         struct thermal_instance *instance;
1281
1282         instance = container_of(attr, struct thermal_instance, weight_attr);
1283
1284         return sprintf(buf, "%d\n", instance->weight);
1285 }
1286
1287 static ssize_t
1288 thermal_cooling_device_weight_store(struct device *dev,
1289                                     struct device_attribute *attr,
1290                                     const char *buf, size_t count)
1291 {
1292         struct thermal_instance *instance;
1293         int ret, weight;
1294
1295         ret = kstrtoint(buf, 0, &weight);
1296         if (ret)
1297                 return ret;
1298
1299         instance = container_of(attr, struct thermal_instance, weight_attr);
1300         instance->weight = weight;
1301
1302         return count;
1303 }
1304 /* Device management */
1305
1306 /**
1307  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1308  * @tz:         pointer to struct thermal_zone_device
1309  * @trip:       indicates which trip point the cooling devices is
1310  *              associated with in this thermal zone.
1311  * @cdev:       pointer to struct thermal_cooling_device
1312  * @upper:      the Maximum cooling state for this trip point.
1313  *              THERMAL_NO_LIMIT means no upper limit,
1314  *              and the cooling device can be in max_state.
1315  * @lower:      the Minimum cooling state can be used for this trip point.
1316  *              THERMAL_NO_LIMIT means no lower limit,
1317  *              and the cooling device can be in cooling state 0.
1318  * @weight:     The weight of the cooling device to be bound to the
1319  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1320  *              default value
1321  *
1322  * This interface function bind a thermal cooling device to the certain trip
1323  * point of a thermal zone device.
1324  * This function is usually called in the thermal zone device .bind callback.
1325  *
1326  * Return: 0 on success, the proper error value otherwise.
1327  */
1328 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1329                                      int trip,
1330                                      struct thermal_cooling_device *cdev,
1331                                      unsigned long upper, unsigned long lower,
1332                                      unsigned int weight)
1333 {
1334         struct thermal_instance *dev;
1335         struct thermal_instance *pos;
1336         struct thermal_zone_device *pos1;
1337         struct thermal_cooling_device *pos2;
1338         unsigned long max_state;
1339         int result, ret;
1340
1341         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1342                 return -EINVAL;
1343
1344         list_for_each_entry(pos1, &thermal_tz_list, node) {
1345                 if (pos1 == tz)
1346                         break;
1347         }
1348         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1349                 if (pos2 == cdev)
1350                         break;
1351         }
1352
1353         if (tz != pos1 || cdev != pos2)
1354                 return -EINVAL;
1355
1356         ret = cdev->ops->get_max_state(cdev, &max_state);
1357         if (ret)
1358                 return ret;
1359
1360         /* lower default 0, upper default max_state */
1361         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1362         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1363
1364         if (lower > upper || upper > max_state)
1365                 return -EINVAL;
1366
1367         dev =
1368             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1369         if (!dev)
1370                 return -ENOMEM;
1371         dev->tz = tz;
1372         dev->cdev = cdev;
1373         dev->trip = trip;
1374         dev->upper = upper;
1375         dev->lower = lower;
1376         dev->target = THERMAL_NO_TARGET;
1377         dev->weight = weight;
1378
1379         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1380         if (result)
1381                 goto free_mem;
1382
1383         sprintf(dev->name, "cdev%d", dev->id);
1384         result =
1385             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1386         if (result)
1387                 goto release_idr;
1388
1389         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1390         sysfs_attr_init(&dev->attr.attr);
1391         dev->attr.attr.name = dev->attr_name;
1392         dev->attr.attr.mode = 0444;
1393         dev->attr.show = thermal_cooling_device_trip_point_show;
1394         result = device_create_file(&tz->device, &dev->attr);
1395         if (result)
1396                 goto remove_symbol_link;
1397
1398         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1399         sysfs_attr_init(&dev->weight_attr.attr);
1400         dev->weight_attr.attr.name = dev->weight_attr_name;
1401         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1402         dev->weight_attr.show = thermal_cooling_device_weight_show;
1403         dev->weight_attr.store = thermal_cooling_device_weight_store;
1404         result = device_create_file(&tz->device, &dev->weight_attr);
1405         if (result)
1406                 goto remove_trip_file;
1407
1408         mutex_lock(&tz->lock);
1409         mutex_lock(&cdev->lock);
1410         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1411             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1412                 result = -EEXIST;
1413                 break;
1414         }
1415         if (!result) {
1416                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1417                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1418                 atomic_set(&tz->need_update, 1);
1419         }
1420         mutex_unlock(&cdev->lock);
1421         mutex_unlock(&tz->lock);
1422
1423         if (!result)
1424                 return 0;
1425
1426         device_remove_file(&tz->device, &dev->weight_attr);
1427 remove_trip_file:
1428         device_remove_file(&tz->device, &dev->attr);
1429 remove_symbol_link:
1430         sysfs_remove_link(&tz->device.kobj, dev->name);
1431 release_idr:
1432         release_idr(&tz->idr, &tz->lock, dev->id);
1433 free_mem:
1434         kfree(dev);
1435         return result;
1436 }
1437 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1438
1439 /**
1440  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1441  *                                        thermal zone.
1442  * @tz:         pointer to a struct thermal_zone_device.
1443  * @trip:       indicates which trip point the cooling devices is
1444  *              associated with in this thermal zone.
1445  * @cdev:       pointer to a struct thermal_cooling_device.
1446  *
1447  * This interface function unbind a thermal cooling device from the certain
1448  * trip point of a thermal zone device.
1449  * This function is usually called in the thermal zone device .unbind callback.
1450  *
1451  * Return: 0 on success, the proper error value otherwise.
1452  */
1453 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1454                                        int trip,
1455                                        struct thermal_cooling_device *cdev)
1456 {
1457         struct thermal_instance *pos, *next;
1458
1459         mutex_lock(&tz->lock);
1460         mutex_lock(&cdev->lock);
1461         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1462                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1463                         list_del(&pos->tz_node);
1464                         list_del(&pos->cdev_node);
1465                         mutex_unlock(&cdev->lock);
1466                         mutex_unlock(&tz->lock);
1467                         goto unbind;
1468                 }
1469         }
1470         mutex_unlock(&cdev->lock);
1471         mutex_unlock(&tz->lock);
1472
1473         return -ENODEV;
1474
1475 unbind:
1476         device_remove_file(&tz->device, &pos->weight_attr);
1477         device_remove_file(&tz->device, &pos->attr);
1478         sysfs_remove_link(&tz->device.kobj, pos->name);
1479         release_idr(&tz->idr, &tz->lock, pos->id);
1480         kfree(pos);
1481         return 0;
1482 }
1483 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1484
1485 static void thermal_release(struct device *dev)
1486 {
1487         struct thermal_zone_device *tz;
1488         struct thermal_cooling_device *cdev;
1489
1490         if (!strncmp(dev_name(dev), "thermal_zone",
1491                      sizeof("thermal_zone") - 1)) {
1492                 tz = to_thermal_zone(dev);
1493                 kfree(tz);
1494         } else if(!strncmp(dev_name(dev), "cooling_device",
1495                         sizeof("cooling_device") - 1)){
1496                 cdev = to_cooling_device(dev);
1497                 kfree(cdev);
1498         }
1499 }
1500
1501 static struct class thermal_class = {
1502         .name = "thermal",
1503         .dev_release = thermal_release,
1504 };
1505
1506 /**
1507  * __thermal_cooling_device_register() - register a new thermal cooling device
1508  * @np:         a pointer to a device tree node.
1509  * @type:       the thermal cooling device type.
1510  * @devdata:    device private data.
1511  * @ops:                standard thermal cooling devices callbacks.
1512  *
1513  * This interface function adds a new thermal cooling device (fan/processor/...)
1514  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1515  * to all the thermal zone devices registered at the same time.
1516  * It also gives the opportunity to link the cooling device to a device tree
1517  * node, so that it can be bound to a thermal zone created out of device tree.
1518  *
1519  * Return: a pointer to the created struct thermal_cooling_device or an
1520  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1521  */
1522 static struct thermal_cooling_device *
1523 __thermal_cooling_device_register(struct device_node *np,
1524                                   char *type, void *devdata,
1525                                   const struct thermal_cooling_device_ops *ops)
1526 {
1527         struct thermal_cooling_device *cdev;
1528         struct thermal_zone_device *pos = NULL;
1529         int result;
1530
1531         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1532                 return ERR_PTR(-EINVAL);
1533
1534         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1535             !ops->set_cur_state)
1536                 return ERR_PTR(-EINVAL);
1537
1538         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1539         if (!cdev)
1540                 return ERR_PTR(-ENOMEM);
1541
1542         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1543         if (result) {
1544                 kfree(cdev);
1545                 return ERR_PTR(result);
1546         }
1547
1548         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1549         mutex_init(&cdev->lock);
1550         INIT_LIST_HEAD(&cdev->thermal_instances);
1551         cdev->np = np;
1552         cdev->ops = ops;
1553         cdev->updated = false;
1554         cdev->device.class = &thermal_class;
1555         cdev->device.groups = cooling_device_attr_groups;
1556         cdev->devdata = devdata;
1557         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1558         result = device_register(&cdev->device);
1559         if (result) {
1560                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1561                 kfree(cdev);
1562                 return ERR_PTR(result);
1563         }
1564
1565         /* Add 'this' new cdev to the global cdev list */
1566         mutex_lock(&thermal_list_lock);
1567         list_add(&cdev->node, &thermal_cdev_list);
1568         mutex_unlock(&thermal_list_lock);
1569
1570         /* Update binding information for 'this' new cdev */
1571         bind_cdev(cdev);
1572
1573         mutex_lock(&thermal_list_lock);
1574         list_for_each_entry(pos, &thermal_tz_list, node)
1575                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1576                         thermal_zone_device_update(pos,
1577                                                    THERMAL_EVENT_UNSPECIFIED);
1578         mutex_unlock(&thermal_list_lock);
1579
1580         return cdev;
1581 }
1582
1583 /**
1584  * thermal_cooling_device_register() - register a new thermal cooling device
1585  * @type:       the thermal cooling device type.
1586  * @devdata:    device private data.
1587  * @ops:                standard thermal cooling devices callbacks.
1588  *
1589  * This interface function adds a new thermal cooling device (fan/processor/...)
1590  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1591  * to all the thermal zone devices registered at the same time.
1592  *
1593  * Return: a pointer to the created struct thermal_cooling_device or an
1594  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1595  */
1596 struct thermal_cooling_device *
1597 thermal_cooling_device_register(char *type, void *devdata,
1598                                 const struct thermal_cooling_device_ops *ops)
1599 {
1600         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1601 }
1602 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1603
1604 /**
1605  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1606  * @np:         a pointer to a device tree node.
1607  * @type:       the thermal cooling device type.
1608  * @devdata:    device private data.
1609  * @ops:                standard thermal cooling devices callbacks.
1610  *
1611  * This function will register a cooling device with device tree node reference.
1612  * This interface function adds a new thermal cooling device (fan/processor/...)
1613  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1614  * to all the thermal zone devices registered at the same time.
1615  *
1616  * Return: a pointer to the created struct thermal_cooling_device or an
1617  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1618  */
1619 struct thermal_cooling_device *
1620 thermal_of_cooling_device_register(struct device_node *np,
1621                                    char *type, void *devdata,
1622                                    const struct thermal_cooling_device_ops *ops)
1623 {
1624         return __thermal_cooling_device_register(np, type, devdata, ops);
1625 }
1626 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1627
1628 /**
1629  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1630  * @cdev:       the thermal cooling device to remove.
1631  *
1632  * thermal_cooling_device_unregister() must be called when the device is no
1633  * longer needed.
1634  */
1635 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1636 {
1637         int i;
1638         const struct thermal_zone_params *tzp;
1639         struct thermal_zone_device *tz;
1640         struct thermal_cooling_device *pos = NULL;
1641
1642         if (!cdev)
1643                 return;
1644
1645         mutex_lock(&thermal_list_lock);
1646         list_for_each_entry(pos, &thermal_cdev_list, node)
1647             if (pos == cdev)
1648                 break;
1649         if (pos != cdev) {
1650                 /* thermal cooling device not found */
1651                 mutex_unlock(&thermal_list_lock);
1652                 return;
1653         }
1654         list_del(&cdev->node);
1655
1656         /* Unbind all thermal zones associated with 'this' cdev */
1657         list_for_each_entry(tz, &thermal_tz_list, node) {
1658                 if (tz->ops->unbind) {
1659                         tz->ops->unbind(tz, cdev);
1660                         continue;
1661                 }
1662
1663                 if (!tz->tzp || !tz->tzp->tbp)
1664                         continue;
1665
1666                 tzp = tz->tzp;
1667                 for (i = 0; i < tzp->num_tbps; i++) {
1668                         if (tzp->tbp[i].cdev == cdev) {
1669                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1670                                 tzp->tbp[i].cdev = NULL;
1671                         }
1672                 }
1673         }
1674
1675         mutex_unlock(&thermal_list_lock);
1676
1677         if (cdev->type[0])
1678                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1679         device_remove_file(&cdev->device, &dev_attr_max_state);
1680         device_remove_file(&cdev->device, &dev_attr_cur_state);
1681
1682         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1683         device_unregister(&cdev->device);
1684         return;
1685 }
1686 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1687
1688 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1689 {
1690         struct thermal_instance *instance;
1691         unsigned long target = 0;
1692
1693         mutex_lock(&cdev->lock);
1694         /* cooling device is updated*/
1695         if (cdev->updated) {
1696                 mutex_unlock(&cdev->lock);
1697                 return;
1698         }
1699
1700         /* Make sure cdev enters the deepest cooling state */
1701         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1702                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1703                                 instance->tz->id, instance->target);
1704                 if (instance->target == THERMAL_NO_TARGET)
1705                         continue;
1706                 if (instance->target > target)
1707                         target = instance->target;
1708         }
1709         cdev->ops->set_cur_state(cdev, target);
1710         cdev->updated = true;
1711         mutex_unlock(&cdev->lock);
1712         trace_cdev_update(cdev, target);
1713         dev_dbg(&cdev->device, "set to state %lu\n", target);
1714 }
1715 EXPORT_SYMBOL(thermal_cdev_update);
1716
1717 /**
1718  * thermal_notify_framework - Sensor drivers use this API to notify framework
1719  * @tz:         thermal zone device
1720  * @trip:       indicates which trip point has been crossed
1721  *
1722  * This function handles the trip events from sensor drivers. It starts
1723  * throttling the cooling devices according to the policy configured.
1724  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1725  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1726  * The throttling policy is based on the configured platform data; if no
1727  * platform data is provided, this uses the step_wise throttling policy.
1728  */
1729 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1730 {
1731         handle_thermal_trip(tz, trip);
1732 }
1733 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1734
1735 /**
1736  * create_trip_attrs() - create attributes for trip points
1737  * @tz:         the thermal zone device
1738  * @mask:       Writeable trip point bitmap.
1739  *
1740  * helper function to instantiate sysfs entries for every trip
1741  * point and its properties of a struct thermal_zone_device.
1742  *
1743  * Return: 0 on success, the proper error value otherwise.
1744  */
1745 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1746 {
1747         int indx;
1748         int size = sizeof(struct thermal_attr) * tz->trips;
1749
1750         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1751         if (!tz->trip_type_attrs)
1752                 return -ENOMEM;
1753
1754         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1755         if (!tz->trip_temp_attrs) {
1756                 kfree(tz->trip_type_attrs);
1757                 return -ENOMEM;
1758         }
1759
1760         if (tz->ops->get_trip_hyst) {
1761                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1762                 if (!tz->trip_hyst_attrs) {
1763                         kfree(tz->trip_type_attrs);
1764                         kfree(tz->trip_temp_attrs);
1765                         return -ENOMEM;
1766                 }
1767         }
1768
1769
1770         for (indx = 0; indx < tz->trips; indx++) {
1771                 /* create trip type attribute */
1772                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1773                          "trip_point_%d_type", indx);
1774
1775                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1776                 tz->trip_type_attrs[indx].attr.attr.name =
1777                                                 tz->trip_type_attrs[indx].name;
1778                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1779                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1780
1781                 device_create_file(&tz->device,
1782                                    &tz->trip_type_attrs[indx].attr);
1783
1784                 /* create trip temp attribute */
1785                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1786                          "trip_point_%d_temp", indx);
1787
1788                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1789                 tz->trip_temp_attrs[indx].attr.attr.name =
1790                                                 tz->trip_temp_attrs[indx].name;
1791                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1792                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1793                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1794                     mask & (1 << indx)) {
1795                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1796                         tz->trip_temp_attrs[indx].attr.store =
1797                                                         trip_point_temp_store;
1798                 }
1799
1800                 device_create_file(&tz->device,
1801                                    &tz->trip_temp_attrs[indx].attr);
1802
1803                 /* create Optional trip hyst attribute */
1804                 if (!tz->ops->get_trip_hyst)
1805                         continue;
1806                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1807                          "trip_point_%d_hyst", indx);
1808
1809                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1810                 tz->trip_hyst_attrs[indx].attr.attr.name =
1811                                         tz->trip_hyst_attrs[indx].name;
1812                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1813                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1814                 if (tz->ops->set_trip_hyst) {
1815                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1816                         tz->trip_hyst_attrs[indx].attr.store =
1817                                         trip_point_hyst_store;
1818                 }
1819
1820                 device_create_file(&tz->device,
1821                                    &tz->trip_hyst_attrs[indx].attr);
1822         }
1823         return 0;
1824 }
1825
1826 static void remove_trip_attrs(struct thermal_zone_device *tz)
1827 {
1828         int indx;
1829
1830         for (indx = 0; indx < tz->trips; indx++) {
1831                 device_remove_file(&tz->device,
1832                                    &tz->trip_type_attrs[indx].attr);
1833                 device_remove_file(&tz->device,
1834                                    &tz->trip_temp_attrs[indx].attr);
1835                 if (tz->ops->get_trip_hyst)
1836                         device_remove_file(&tz->device,
1837                                   &tz->trip_hyst_attrs[indx].attr);
1838         }
1839         kfree(tz->trip_type_attrs);
1840         kfree(tz->trip_temp_attrs);
1841         kfree(tz->trip_hyst_attrs);
1842 }
1843
1844 /**
1845  * thermal_zone_device_register() - register a new thermal zone device
1846  * @type:       the thermal zone device type
1847  * @trips:      the number of trip points the thermal zone support
1848  * @mask:       a bit string indicating the writeablility of trip points
1849  * @devdata:    private device data
1850  * @ops:        standard thermal zone device callbacks
1851  * @tzp:        thermal zone platform parameters
1852  * @passive_delay: number of milliseconds to wait between polls when
1853  *                 performing passive cooling
1854  * @polling_delay: number of milliseconds to wait between polls when checking
1855  *                 whether trip points have been crossed (0 for interrupt
1856  *                 driven systems)
1857  *
1858  * This interface function adds a new thermal zone device (sensor) to
1859  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1860  * thermal cooling devices registered at the same time.
1861  * thermal_zone_device_unregister() must be called when the device is no
1862  * longer needed. The passive cooling depends on the .get_trend() return value.
1863  *
1864  * Return: a pointer to the created struct thermal_zone_device or an
1865  * in case of error, an ERR_PTR. Caller must check return value with
1866  * IS_ERR*() helpers.
1867  */
1868 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1869         int trips, int mask, void *devdata,
1870         struct thermal_zone_device_ops *ops,
1871         struct thermal_zone_params *tzp,
1872         int passive_delay, int polling_delay)
1873 {
1874         struct thermal_zone_device *tz;
1875         enum thermal_trip_type trip_type;
1876         int trip_temp;
1877         int result;
1878         int count;
1879         int passive = 0;
1880         struct thermal_governor *governor;
1881
1882         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1883                 return ERR_PTR(-EINVAL);
1884
1885         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1886                 return ERR_PTR(-EINVAL);
1887
1888         if (!ops)
1889                 return ERR_PTR(-EINVAL);
1890
1891         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1892                 return ERR_PTR(-EINVAL);
1893
1894         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1895         if (!tz)
1896                 return ERR_PTR(-ENOMEM);
1897
1898         INIT_LIST_HEAD(&tz->thermal_instances);
1899         idr_init(&tz->idr);
1900         mutex_init(&tz->lock);
1901         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1902         if (result) {
1903                 kfree(tz);
1904                 return ERR_PTR(result);
1905         }
1906
1907         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1908         tz->ops = ops;
1909         tz->tzp = tzp;
1910         tz->device.class = &thermal_class;
1911         tz->devdata = devdata;
1912         tz->trips = trips;
1913         tz->passive_delay = passive_delay;
1914         tz->polling_delay = polling_delay;
1915         /* A new thermal zone needs to be updated anyway. */
1916         atomic_set(&tz->need_update, 1);
1917
1918         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1919         result = device_register(&tz->device);
1920         if (result) {
1921                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1922                 kfree(tz);
1923                 return ERR_PTR(result);
1924         }
1925
1926         /* sys I/F */
1927         if (type) {
1928                 result = device_create_file(&tz->device, &dev_attr_type);
1929                 if (result)
1930                         goto unregister;
1931         }
1932
1933         result = device_create_file(&tz->device, &dev_attr_temp);
1934         if (result)
1935                 goto unregister;
1936
1937         if (ops->get_mode) {
1938                 result = device_create_file(&tz->device, &dev_attr_mode);
1939                 if (result)
1940                         goto unregister;
1941         }
1942
1943         result = create_trip_attrs(tz, mask);
1944         if (result)
1945                 goto unregister;
1946
1947         for (count = 0; count < trips; count++) {
1948                 if (tz->ops->get_trip_type(tz, count, &trip_type))
1949                         set_bit(count, &tz->trips_disabled);
1950                 if (trip_type == THERMAL_TRIP_PASSIVE)
1951                         passive = 1;
1952                 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1953                         set_bit(count, &tz->trips_disabled);
1954                 /* Check for bogus trip points */
1955                 if (trip_temp == 0)
1956                         set_bit(count, &tz->trips_disabled);
1957         }
1958
1959         if (!passive) {
1960                 result = device_create_file(&tz->device, &dev_attr_passive);
1961                 if (result)
1962                         goto unregister;
1963         }
1964
1965         if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1966                 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1967                 if (result)
1968                         goto unregister;
1969         }
1970
1971         /* Create policy attribute */
1972         result = device_create_file(&tz->device, &dev_attr_policy);
1973         if (result)
1974                 goto unregister;
1975
1976         /* Add thermal zone params */
1977         result = create_tzp_attrs(&tz->device);
1978         if (result)
1979                 goto unregister;
1980
1981         /* Create available_policies attribute */
1982         result = device_create_file(&tz->device, &dev_attr_available_policies);
1983         if (result)
1984                 goto unregister;
1985
1986         /* Update 'this' zone's governor information */
1987         mutex_lock(&thermal_governor_lock);
1988
1989         if (tz->tzp)
1990                 governor = __find_governor(tz->tzp->governor_name);
1991         else
1992                 governor = def_governor;
1993
1994         result = thermal_set_governor(tz, governor);
1995         if (result) {
1996                 mutex_unlock(&thermal_governor_lock);
1997                 goto unregister;
1998         }
1999
2000         mutex_unlock(&thermal_governor_lock);
2001
2002         if (!tz->tzp || !tz->tzp->no_hwmon) {
2003                 result = thermal_add_hwmon_sysfs(tz);
2004                 if (result)
2005                         goto unregister;
2006         }
2007
2008         mutex_lock(&thermal_list_lock);
2009         list_add_tail(&tz->node, &thermal_tz_list);
2010         mutex_unlock(&thermal_list_lock);
2011
2012         /* Bind cooling devices for this zone */
2013         bind_tz(tz);
2014
2015         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
2016
2017         thermal_zone_device_reset(tz);
2018         /* Update the new thermal zone and mark it as already updated. */
2019         if (atomic_cmpxchg(&tz->need_update, 1, 0))
2020                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
2021
2022         return tz;
2023
2024 unregister:
2025         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2026         device_unregister(&tz->device);
2027         return ERR_PTR(result);
2028 }
2029 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
2030
2031 /**
2032  * thermal_zone_device_unregister - removes the registered thermal zone device
2033  * @tz: the thermal zone device to remove
2034  */
2035 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
2036 {
2037         int i;
2038         const struct thermal_zone_params *tzp;
2039         struct thermal_cooling_device *cdev;
2040         struct thermal_zone_device *pos = NULL;
2041
2042         if (!tz)
2043                 return;
2044
2045         tzp = tz->tzp;
2046
2047         mutex_lock(&thermal_list_lock);
2048         list_for_each_entry(pos, &thermal_tz_list, node)
2049             if (pos == tz)
2050                 break;
2051         if (pos != tz) {
2052                 /* thermal zone device not found */
2053                 mutex_unlock(&thermal_list_lock);
2054                 return;
2055         }
2056         list_del(&tz->node);
2057
2058         /* Unbind all cdevs associated with 'this' thermal zone */
2059         list_for_each_entry(cdev, &thermal_cdev_list, node) {
2060                 if (tz->ops->unbind) {
2061                         tz->ops->unbind(tz, cdev);
2062                         continue;
2063                 }
2064
2065                 if (!tzp || !tzp->tbp)
2066                         break;
2067
2068                 for (i = 0; i < tzp->num_tbps; i++) {
2069                         if (tzp->tbp[i].cdev == cdev) {
2070                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
2071                                 tzp->tbp[i].cdev = NULL;
2072                         }
2073                 }
2074         }
2075
2076         mutex_unlock(&thermal_list_lock);
2077
2078         cancel_delayed_work_sync(&tz->poll_queue);
2079
2080         if (tz->type[0])
2081                 device_remove_file(&tz->device, &dev_attr_type);
2082         device_remove_file(&tz->device, &dev_attr_temp);
2083         if (tz->ops->get_mode)
2084                 device_remove_file(&tz->device, &dev_attr_mode);
2085         device_remove_file(&tz->device, &dev_attr_policy);
2086         device_remove_file(&tz->device, &dev_attr_available_policies);
2087         remove_trip_attrs(tz);
2088         thermal_set_governor(tz, NULL);
2089
2090         thermal_remove_hwmon_sysfs(tz);
2091         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
2092         idr_destroy(&tz->idr);
2093         mutex_destroy(&tz->lock);
2094         device_unregister(&tz->device);
2095         return;
2096 }
2097 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
2098
2099 /**
2100  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
2101  * @name: thermal zone name to fetch the temperature
2102  *
2103  * When only one zone is found with the passed name, returns a reference to it.
2104  *
2105  * Return: On success returns a reference to an unique thermal zone with
2106  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
2107  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
2108  */
2109 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
2110 {
2111         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
2112         unsigned int found = 0;
2113
2114         if (!name)
2115                 goto exit;
2116
2117         mutex_lock(&thermal_list_lock);
2118         list_for_each_entry(pos, &thermal_tz_list, node)
2119                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
2120                         found++;
2121                         ref = pos;
2122                 }
2123         mutex_unlock(&thermal_list_lock);
2124
2125         /* nothing has been found, thus an error code for it */
2126         if (found == 0)
2127                 ref = ERR_PTR(-ENODEV);
2128         else if (found > 1)
2129         /* Success only when an unique zone is found */
2130                 ref = ERR_PTR(-EEXIST);
2131
2132 exit:
2133         return ref;
2134 }
2135 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
2136
2137 /**
2138  * thermal_zone_get_slope - return the slope attribute of the thermal zone
2139  * @tz: thermal zone device with the slope attribute
2140  *
2141  * Return: If the thermal zone device has a slope attribute, return it, else
2142  * return 1.
2143  */
2144 int thermal_zone_get_slope(struct thermal_zone_device *tz)
2145 {
2146         if (tz && tz->tzp)
2147                 return tz->tzp->slope;
2148         return 1;
2149 }
2150 EXPORT_SYMBOL_GPL(thermal_zone_get_slope);
2151
2152 /**
2153  * thermal_zone_get_offset - return the offset attribute of the thermal zone
2154  * @tz: thermal zone device with the offset attribute
2155  *
2156  * Return: If the thermal zone device has a offset attribute, return it, else
2157  * return 0.
2158  */
2159 int thermal_zone_get_offset(struct thermal_zone_device *tz)
2160 {
2161         if (tz && tz->tzp)
2162                 return tz->tzp->offset;
2163         return 0;
2164 }
2165 EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
2166
2167 #ifdef CONFIG_NET
2168 static const struct genl_multicast_group thermal_event_mcgrps[] = {
2169         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
2170 };
2171
2172 static struct genl_family thermal_event_genl_family = {
2173         .id = GENL_ID_GENERATE,
2174         .name = THERMAL_GENL_FAMILY_NAME,
2175         .version = THERMAL_GENL_VERSION,
2176         .maxattr = THERMAL_GENL_ATTR_MAX,
2177         .mcgrps = thermal_event_mcgrps,
2178         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
2179 };
2180
2181 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2182                                         enum events event)
2183 {
2184         struct sk_buff *skb;
2185         struct nlattr *attr;
2186         struct thermal_genl_event *thermal_event;
2187         void *msg_header;
2188         int size;
2189         int result;
2190         static unsigned int thermal_event_seqnum;
2191
2192         if (!tz)
2193                 return -EINVAL;
2194
2195         /* allocate memory */
2196         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2197                nla_total_size(0);
2198
2199         skb = genlmsg_new(size, GFP_ATOMIC);
2200         if (!skb)
2201                 return -ENOMEM;
2202
2203         /* add the genetlink message header */
2204         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2205                                  &thermal_event_genl_family, 0,
2206                                  THERMAL_GENL_CMD_EVENT);
2207         if (!msg_header) {
2208                 nlmsg_free(skb);
2209                 return -ENOMEM;
2210         }
2211
2212         /* fill the data */
2213         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2214                            sizeof(struct thermal_genl_event));
2215
2216         if (!attr) {
2217                 nlmsg_free(skb);
2218                 return -EINVAL;
2219         }
2220
2221         thermal_event = nla_data(attr);
2222         if (!thermal_event) {
2223                 nlmsg_free(skb);
2224                 return -EINVAL;
2225         }
2226
2227         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2228
2229         thermal_event->orig = tz->id;
2230         thermal_event->event = event;
2231
2232         /* send multicast genetlink message */
2233         genlmsg_end(skb, msg_header);
2234
2235         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2236                                    0, GFP_ATOMIC);
2237         if (result)
2238                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2239
2240         return result;
2241 }
2242 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2243
2244 static int genetlink_init(void)
2245 {
2246         return genl_register_family(&thermal_event_genl_family);
2247 }
2248
2249 static void genetlink_exit(void)
2250 {
2251         genl_unregister_family(&thermal_event_genl_family);
2252 }
2253 #else /* !CONFIG_NET */
2254 static inline int genetlink_init(void) { return 0; }
2255 static inline void genetlink_exit(void) {}
2256 #endif /* !CONFIG_NET */
2257
2258 static int __init thermal_register_governors(void)
2259 {
2260         int result;
2261
2262         result = thermal_gov_step_wise_register();
2263         if (result)
2264                 return result;
2265
2266         result = thermal_gov_fair_share_register();
2267         if (result)
2268                 return result;
2269
2270         result = thermal_gov_bang_bang_register();
2271         if (result)
2272                 return result;
2273
2274         result = thermal_gov_user_space_register();
2275         if (result)
2276                 return result;
2277
2278         return thermal_gov_power_allocator_register();
2279 }
2280
2281 static void thermal_unregister_governors(void)
2282 {
2283         thermal_gov_step_wise_unregister();
2284         thermal_gov_fair_share_unregister();
2285         thermal_gov_bang_bang_unregister();
2286         thermal_gov_user_space_unregister();
2287         thermal_gov_power_allocator_unregister();
2288 }
2289
2290 static int thermal_pm_notify(struct notifier_block *nb,
2291                                 unsigned long mode, void *_unused)
2292 {
2293         struct thermal_zone_device *tz;
2294
2295         switch (mode) {
2296         case PM_HIBERNATION_PREPARE:
2297         case PM_RESTORE_PREPARE:
2298         case PM_SUSPEND_PREPARE:
2299                 atomic_set(&in_suspend, 1);
2300                 break;
2301         case PM_POST_HIBERNATION:
2302         case PM_POST_RESTORE:
2303         case PM_POST_SUSPEND:
2304                 atomic_set(&in_suspend, 0);
2305                 list_for_each_entry(tz, &thermal_tz_list, node) {
2306                         thermal_zone_device_init(tz);
2307                         thermal_zone_device_update(tz,
2308                                                    THERMAL_EVENT_UNSPECIFIED);
2309                 }
2310                 break;
2311         default:
2312                 break;
2313         }
2314         return 0;
2315 }
2316
2317 static struct notifier_block thermal_pm_nb = {
2318         .notifier_call = thermal_pm_notify,
2319 };
2320
2321 static int __init thermal_init(void)
2322 {
2323         int result;
2324
2325         result = thermal_register_governors();
2326         if (result)
2327                 goto error;
2328
2329         result = class_register(&thermal_class);
2330         if (result)
2331                 goto unregister_governors;
2332
2333         result = genetlink_init();
2334         if (result)
2335                 goto unregister_class;
2336
2337         result = of_parse_thermal_zones();
2338         if (result)
2339                 goto exit_netlink;
2340
2341         result = register_pm_notifier(&thermal_pm_nb);
2342         if (result)
2343                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
2344                         result);
2345
2346         return 0;
2347
2348 exit_netlink:
2349         genetlink_exit();
2350 unregister_class:
2351         class_unregister(&thermal_class);
2352 unregister_governors:
2353         thermal_unregister_governors();
2354 error:
2355         idr_destroy(&thermal_tz_idr);
2356         idr_destroy(&thermal_cdev_idr);
2357         mutex_destroy(&thermal_idr_lock);
2358         mutex_destroy(&thermal_list_lock);
2359         mutex_destroy(&thermal_governor_lock);
2360         return result;
2361 }
2362
2363 static void __exit thermal_exit(void)
2364 {
2365         unregister_pm_notifier(&thermal_pm_nb);
2366         of_thermal_destroy_zones();
2367         genetlink_exit();
2368         class_unregister(&thermal_class);
2369         thermal_unregister_governors();
2370         idr_destroy(&thermal_tz_idr);
2371         idr_destroy(&thermal_cdev_idr);
2372         mutex_destroy(&thermal_idr_lock);
2373         mutex_destroy(&thermal_list_lock);
2374         mutex_destroy(&thermal_governor_lock);
2375 }
2376
2377 fs_initcall(thermal_init);
2378 module_exit(thermal_exit);