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_reset(struct thermal_zone_device *tz)
 601 {
 602         struct thermal_instance *pos;
 603
 604         tz->temperature = THERMAL_TEMP_INVALID;
 605         tz->passive = 0;
 606         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 607                 pos->initialized = false;
 608 }
 609
 610 void thermal_zone_device_update(struct thermal_zone_device *tz,
 611                                 enum thermal_notify_event event)
 612 {
 613         int count;
 614
 615         if (atomic_read(&in_suspend))
 616                 return;
 617
 618         if (!tz->ops->get_temp)
 619                 return;
 620
 621         update_temperature(tz);
 622
 623         thermal_zone_set_trips(tz);
 624
 625         tz->notify_event = event;
 626
 627         for (count = 0; count < tz->trips; count++)
 628                 handle_thermal_trip(tz, count);
 629 }
 630 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 631
 632 static void thermal_zone_device_check(struct work_struct *work)
 633 {
 634         struct thermal_zone_device *tz = container_of(work, struct
 635                                                       thermal_zone_device,
 636                                                       poll_queue.work);
 637         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 638 }
 639
 640 /**
 641  * power_actor_get_max_power() - get the maximum power that a cdev can consume
 642  * @cdev:       pointer to &thermal_cooling_device
 643  * @tz:         a valid thermal zone device pointer
 644  * @max_power:  pointer in which to store the maximum power
 645  *
 646  * Calculate the maximum power consumption in milliwats that the
 647  * cooling device can currently consume and store it in @max_power.
 648  *
 649  * Return: 0 on success, -EINVAL if @cdev doesn't support the
 650  * power_actor API or -E* on other error.
 651  */
 652 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 653                               struct thermal_zone_device *tz, u32 *max_power)
 654 {
 655         if (!cdev_is_power_actor(cdev))
 656                 return -EINVAL;
 657
 658         return cdev->ops->state2power(cdev, tz, 0, max_power);
 659 }
 660
 661 /**
 662  * power_actor_get_min_power() - get the mainimum power that a cdev can consume
 663  * @cdev:       pointer to &thermal_cooling_device
 664  * @tz:         a valid thermal zone device pointer
 665  * @min_power:  pointer in which to store the minimum power
 666  *
 667  * Calculate the minimum power consumption in milliwatts that the
 668  * cooling device can currently consume and store it in @min_power.
 669  *
 670  * Return: 0 on success, -EINVAL if @cdev doesn't support the
 671  * power_actor API or -E* on other error.
 672  */
 673 int power_actor_get_min_power(struct thermal_cooling_device *cdev,
 674                               struct thermal_zone_device *tz, u32 *min_power)
 675 {
 676         unsigned long max_state;
 677         int ret;
 678
 679         if (!cdev_is_power_actor(cdev))
 680                 return -EINVAL;
 681
 682         ret = cdev->ops->get_max_state(cdev, &max_state);
 683         if (ret)
 684                 return ret;
 685
 686         return cdev->ops->state2power(cdev, tz, max_state, min_power);
 687 }
 688
 689 /**
 690  * power_actor_set_power() - limit the maximum power a cooling device consumes
 691  * @cdev:       pointer to &thermal_cooling_device
 692  * @instance:   thermal instance to update
 693  * @power:      the power in milliwatts
 694  *
 695  * Set the cooling device to consume at most @power milliwatts. The limit is
 696  * expected to be a cap at the maximum power consumption.
 697  *
 698  * Return: 0 on success, -EINVAL if the cooling device does not
 699  * implement the power actor API or -E* for other failures.
 700  */
 701 int power_actor_set_power(struct thermal_cooling_device *cdev,
 702                           struct thermal_instance *instance, u32 power)
 703 {
 704         unsigned long state;
 705         int ret;
 706
 707         if (!cdev_is_power_actor(cdev))
 708                 return -EINVAL;
 709
 710         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
 711         if (ret)
 712                 return ret;
 713
 714         instance->target = state;
 715         mutex_lock(&cdev->lock);
 716         cdev->updated = false;
 717         mutex_unlock(&cdev->lock);
 718         thermal_cdev_update(cdev);
 719
 720         return 0;
 721 }
 722
 723 void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz,
 724                                           const char *cdev_type, size_t size)
 725 {
 726         struct thermal_cooling_device *cdev = NULL;
 727
 728         mutex_lock(&thermal_list_lock);
 729         list_for_each_entry(cdev, &thermal_cdev_list, node) {
 730                 /* skip non matching cdevs */
 731                 if (strncmp(cdev_type, cdev->type, size))
 732                         continue;
 733
 734                 /* re binding the exception matching the type pattern */
 735                 thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev,
 736                                                  THERMAL_NO_LIMIT,
 737                                                  THERMAL_NO_LIMIT,
 738                                                  THERMAL_WEIGHT_DEFAULT);
 739         }
 740         mutex_unlock(&thermal_list_lock);
 741 }
 742
 743 void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,
 744                                           const char *cdev_type, size_t size)
 745 {
 746         struct thermal_cooling_device *cdev = NULL;
 747
 748         mutex_lock(&thermal_list_lock);
 749         list_for_each_entry(cdev, &thermal_cdev_list, node) {
 750                 /* skip non matching cdevs */
 751                 if (strncmp(cdev_type, cdev->type, size))
 752                         continue;
 753                 /* unbinding the exception matching the type pattern */
 754                 thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE,
 755                                                    cdev);
 756         }
 757         mutex_unlock(&thermal_list_lock);
 758 }
 759
 760 int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
 761                                    char *policy)
 762 {
 763         struct thermal_governor *gov;
 764         int ret = -EINVAL;
 765
 766         mutex_lock(&thermal_governor_lock);
 767         mutex_lock(&tz->lock);
 768
 769         gov = __find_governor(strim(policy));
 770         if (!gov)
 771                 goto exit;
 772
 773         ret = thermal_set_governor(tz, gov);
 774
 775 exit:
 776         mutex_unlock(&tz->lock);
 777         mutex_unlock(&thermal_governor_lock);
 778
 779         return ret;
 780 }
 781
 782 int thermal_build_list_of_policies(char *buf)
 783 {
 784         struct thermal_governor *pos;
 785         ssize_t count = 0;
 786         ssize_t size = PAGE_SIZE;
 787
 788         mutex_lock(&thermal_governor_lock);
 789
 790         list_for_each_entry(pos, &thermal_governor_list, governor_list) {
 791                 size = PAGE_SIZE - count;
 792                 count += scnprintf(buf + count, size, "%s ", pos->name);
 793         }
 794         count += scnprintf(buf + count, size, "\n");
 795
 796         mutex_unlock(&thermal_governor_lock);
 797
 798         return count;
 799 }
 800
 801 /* Device management */
 802
 803 /**
 804  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
 805  * @tz:         pointer to struct thermal_zone_device
 806  * @trip:       indicates which trip point the cooling devices is
 807  *              associated with in this thermal zone.
 808  * @cdev:       pointer to struct thermal_cooling_device
 809  * @upper:      the Maximum cooling state for this trip point.
 810  *              THERMAL_NO_LIMIT means no upper limit,
 811  *              and the cooling device can be in max_state.
 812  * @lower:      the Minimum cooling state can be used for this trip point.
 813  *              THERMAL_NO_LIMIT means no lower limit,
 814  *              and the cooling device can be in cooling state 0.
 815  * @weight:     The weight of the cooling device to be bound to the
 816  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
 817  *              default value
 818  *
 819  * This interface function bind a thermal cooling device to the certain trip
 820  * point of a thermal zone device.
 821  * This function is usually called in the thermal zone device .bind callback.
 822  *
 823  * Return: 0 on success, the proper error value otherwise.
 824  */
 825 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 826                                      int trip,
 827                                      struct thermal_cooling_device *cdev,
 828                                      unsigned long upper, unsigned long lower,
 829                                      unsigned int weight)
 830 {
 831         struct thermal_instance *dev;
 832         struct thermal_instance *pos;
 833         struct thermal_zone_device *pos1;
 834         struct thermal_cooling_device *pos2;
 835         unsigned long max_state;
 836         int result, ret;
 837
 838         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 839                 return -EINVAL;
 840
 841         list_for_each_entry(pos1, &thermal_tz_list, node) {
 842                 if (pos1 == tz)
 843                         break;
 844         }
 845         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 846                 if (pos2 == cdev)
 847                         break;
 848         }
 849
 850         if (tz != pos1 || cdev != pos2)
 851                 return -EINVAL;
 852
 853         ret = cdev->ops->get_max_state(cdev, &max_state);
 854         if (ret)
 855                 return ret;
 856
 857         /* lower default 0, upper default max_state */
 858         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
 859         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
 860
 861         if (lower > upper || upper > max_state)
 862                 return -EINVAL;
 863
 864         dev =
 865             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
 866         if (!dev)
 867                 return -ENOMEM;
 868         dev->tz = tz;
 869         dev->cdev = cdev;
 870         dev->trip = trip;
 871         dev->upper = upper;
 872         dev->lower = lower;
 873         dev->target = THERMAL_NO_TARGET;
 874         dev->weight = weight;
 875
 876         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 877         if (result)
 878                 goto free_mem;
 879
 880         sprintf(dev->name, "cdev%d", dev->id);
 881         result =
 882             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 883         if (result)
 884                 goto release_idr;
 885
 886         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 887         sysfs_attr_init(&dev->attr.attr);
 888         dev->attr.attr.name = dev->attr_name;
 889         dev->attr.attr.mode = 0444;
 890         dev->attr.show = thermal_cooling_device_trip_point_show;
 891         result = device_create_file(&tz->device, &dev->attr);
 892         if (result)
 893                 goto remove_symbol_link;
 894
 895         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
 896         sysfs_attr_init(&dev->weight_attr.attr);
 897         dev->weight_attr.attr.name = dev->weight_attr_name;
 898         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
 899         dev->weight_attr.show = thermal_cooling_device_weight_show;
 900         dev->weight_attr.store = thermal_cooling_device_weight_store;
 901         result = device_create_file(&tz->device, &dev->weight_attr);
 902         if (result)
 903                 goto remove_trip_file;
 904
 905         mutex_lock(&tz->lock);
 906         mutex_lock(&cdev->lock);
 907         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 908             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 909                 result = -EEXIST;
 910                 break;
 911         }
 912         if (!result) {
 913                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
 914                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 915                 atomic_set(&tz->need_update, 1);
 916         }
 917         mutex_unlock(&cdev->lock);
 918         mutex_unlock(&tz->lock);
 919
 920         if (!result)
 921                 return 0;
 922
 923         device_remove_file(&tz->device, &dev->weight_attr);
 924 remove_trip_file:
 925         device_remove_file(&tz->device, &dev->attr);
 926 remove_symbol_link:
 927         sysfs_remove_link(&tz->device.kobj, dev->name);
 928 release_idr:
 929         release_idr(&tz->idr, &tz->lock, dev->id);
 930 free_mem:
 931         kfree(dev);
 932         return result;
 933 }
 934 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
 935
 936 /**
 937  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
 938  *                                        thermal zone.
 939  * @tz:         pointer to a struct thermal_zone_device.
 940  * @trip:       indicates which trip point the cooling devices is
 941  *              associated with in this thermal zone.
 942  * @cdev:       pointer to a struct thermal_cooling_device.
 943  *
 944  * This interface function unbind a thermal cooling device from the certain
 945  * trip point of a thermal zone device.
 946  * This function is usually called in the thermal zone device .unbind callback.
 947  *
 948  * Return: 0 on success, the proper error value otherwise.
 949  */
 950 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 951                                        int trip,
 952                                        struct thermal_cooling_device *cdev)
 953 {
 954         struct thermal_instance *pos, *next;
 955
 956         mutex_lock(&tz->lock);
 957         mutex_lock(&cdev->lock);
 958         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 959                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 960                         list_del(&pos->tz_node);
 961                         list_del(&pos->cdev_node);
 962                         mutex_unlock(&cdev->lock);
 963                         mutex_unlock(&tz->lock);
 964                         goto unbind;
 965                 }
 966         }
 967         mutex_unlock(&cdev->lock);
 968         mutex_unlock(&tz->lock);
 969
 970         return -ENODEV;
 971
 972 unbind:
 973         device_remove_file(&tz->device, &pos->weight_attr);
 974         device_remove_file(&tz->device, &pos->attr);
 975         sysfs_remove_link(&tz->device.kobj, pos->name);
 976         release_idr(&tz->idr, &tz->lock, pos->id);
 977         kfree(pos);
 978         return 0;
 979 }
 980 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
 981
 982 static void thermal_release(struct device *dev)
 983 {
 984         struct thermal_zone_device *tz;
 985         struct thermal_cooling_device *cdev;
 986
 987         if (!strncmp(dev_name(dev), "thermal_zone",
 988                      sizeof("thermal_zone") - 1)) {
 989                 tz = to_thermal_zone(dev);
 990                 kfree(tz);
 991         } else if(!strncmp(dev_name(dev), "cooling_device",
 992                         sizeof("cooling_device") - 1)){
 993                 cdev = to_cooling_device(dev);
 994                 kfree(cdev);
 995         }
 996 }
 997
 998 static struct class thermal_class = {
 999         .name = "thermal",
1000         .dev_release = thermal_release,
1001 };
1002
1003 /**
1004  * __thermal_cooling_device_register() - register a new thermal cooling device
1005  * @np:         a pointer to a device tree node.
1006  * @type:       the thermal cooling device type.
1007  * @devdata:    device private data.
1008  * @ops:                standard thermal cooling devices callbacks.
1009  *
1010  * This interface function adds a new thermal cooling device (fan/processor/...)
1011  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1012  * to all the thermal zone devices registered at the same time.
1013  * It also gives the opportunity to link the cooling device to a device tree
1014  * node, so that it can be bound to a thermal zone created out of device tree.
1015  *
1016  * Return: a pointer to the created struct thermal_cooling_device or an
1017  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1018  */
1019 static struct thermal_cooling_device *
1020 __thermal_cooling_device_register(struct device_node *np,
1021                                   char *type, void *devdata,
1022                                   const struct thermal_cooling_device_ops *ops)
1023 {
1024         struct thermal_cooling_device *cdev;
1025         struct thermal_zone_device *pos = NULL;
1026         int result;
1027
1028         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1029                 return ERR_PTR(-EINVAL);
1030
1031         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1032             !ops->set_cur_state)
1033                 return ERR_PTR(-EINVAL);
1034
1035         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1036         if (!cdev)
1037                 return ERR_PTR(-ENOMEM);
1038
1039         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1040         if (result) {
1041                 kfree(cdev);
1042                 return ERR_PTR(result);
1043         }
1044
1045         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1046         mutex_init(&cdev->lock);
1047         INIT_LIST_HEAD(&cdev->thermal_instances);
1048         cdev->np = np;
1049         cdev->ops = ops;
1050         cdev->updated = false;
1051         cdev->device.class = &thermal_class;
1052         thermal_cooling_device_setup_sysfs(cdev);
1053         cdev->devdata = devdata;
1054         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1055         result = device_register(&cdev->device);
1056         if (result) {
1057                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1058                 kfree(cdev);
1059                 return ERR_PTR(result);
1060         }
1061
1062         /* Add 'this' new cdev to the global cdev list */
1063         mutex_lock(&thermal_list_lock);
1064         list_add(&cdev->node, &thermal_cdev_list);
1065         mutex_unlock(&thermal_list_lock);
1066
1067         /* Update binding information for 'this' new cdev */
1068         bind_cdev(cdev);
1069
1070         mutex_lock(&thermal_list_lock);
1071         list_for_each_entry(pos, &thermal_tz_list, node)
1072                 if (atomic_cmpxchg(&pos->need_update, 1, 0))
1073                         thermal_zone_device_update(pos,
1074                                                    THERMAL_EVENT_UNSPECIFIED);
1075         mutex_unlock(&thermal_list_lock);
1076
1077         return cdev;
1078 }
1079
1080 /**
1081  * thermal_cooling_device_register() - register a new thermal cooling device
1082  * @type:       the thermal cooling device type.
1083  * @devdata:    device private data.
1084  * @ops:                standard thermal cooling devices callbacks.
1085  *
1086  * This interface function adds a new thermal cooling device (fan/processor/...)
1087  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1088  * to all the thermal zone devices registered at the same time.
1089  *
1090  * Return: a pointer to the created struct thermal_cooling_device or an
1091  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1092  */
1093 struct thermal_cooling_device *
1094 thermal_cooling_device_register(char *type, void *devdata,
1095                                 const struct thermal_cooling_device_ops *ops)
1096 {
1097         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1098 }
1099 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1100
1101 /**
1102  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1103  * @np:         a pointer to a device tree node.
1104  * @type:       the thermal cooling device type.
1105  * @devdata:    device private data.
1106  * @ops:                standard thermal cooling devices callbacks.
1107  *
1108  * This function will register a cooling device with device tree node reference.
1109  * This interface function adds a new thermal cooling device (fan/processor/...)
1110  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1111  * to all the thermal zone devices registered at the same time.
1112  *
1113  * Return: a pointer to the created struct thermal_cooling_device or an
1114  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1115  */
1116 struct thermal_cooling_device *
1117 thermal_of_cooling_device_register(struct device_node *np,
1118                                    char *type, void *devdata,
1119                                    const struct thermal_cooling_device_ops *ops)
1120 {
1121         return __thermal_cooling_device_register(np, type, devdata, ops);
1122 }
1123 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1124
1125 /**
1126  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1127  * @cdev:       the thermal cooling device to remove.
1128  *
1129  * thermal_cooling_device_unregister() must be called when the device is no
1130  * longer needed.
1131  */
1132 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1133 {
1134         int i;
1135         const struct thermal_zone_params *tzp;
1136         struct thermal_zone_device *tz;
1137         struct thermal_cooling_device *pos = NULL;
1138
1139         if (!cdev)
1140                 return;
1141
1142         mutex_lock(&thermal_list_lock);
1143         list_for_each_entry(pos, &thermal_cdev_list, node)
1144             if (pos == cdev)
1145                 break;
1146         if (pos != cdev) {
1147                 /* thermal cooling device not found */
1148                 mutex_unlock(&thermal_list_lock);
1149                 return;
1150         }
1151         list_del(&cdev->node);
1152
1153         /* Unbind all thermal zones associated with 'this' cdev */
1154         list_for_each_entry(tz, &thermal_tz_list, node) {
1155                 if (tz->ops->unbind) {
1156                         tz->ops->unbind(tz, cdev);
1157                         continue;
1158                 }
1159
1160                 if (!tz->tzp || !tz->tzp->tbp)
1161                         continue;
1162
1163                 tzp = tz->tzp;
1164                 for (i = 0; i < tzp->num_tbps; i++) {
1165                         if (tzp->tbp[i].cdev == cdev) {
1166                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1167                                 tzp->tbp[i].cdev = NULL;
1168                         }
1169                 }
1170         }
1171
1172         mutex_unlock(&thermal_list_lock);
1173
1174         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1175         device_unregister(&cdev->device);
1176         return;
1177 }
1178 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1179
1180 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1181 {
1182         struct thermal_instance *instance;
1183         unsigned long target = 0;
1184
1185         mutex_lock(&cdev->lock);
1186         /* cooling device is updated*/
1187         if (cdev->updated) {
1188                 mutex_unlock(&cdev->lock);
1189                 return;
1190         }
1191
1192         /* Make sure cdev enters the deepest cooling state */
1193         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1194                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1195                                 instance->tz->id, instance->target);
1196                 if (instance->target == THERMAL_NO_TARGET)
1197                         continue;
1198                 if (instance->target > target)
1199                         target = instance->target;
1200         }
1201         cdev->ops->set_cur_state(cdev, target);
1202         cdev->updated = true;
1203         mutex_unlock(&cdev->lock);
1204         trace_cdev_update(cdev, target);
1205         dev_dbg(&cdev->device, "set to state %lu\n", target);
1206 }
1207 EXPORT_SYMBOL(thermal_cdev_update);
1208
1209 /**
1210  * thermal_notify_framework - Sensor drivers use this API to notify framework
1211  * @tz:         thermal zone device
1212  * @trip:       indicates which trip point has been crossed
1213  *
1214  * This function handles the trip events from sensor drivers. It starts
1215  * throttling the cooling devices according to the policy configured.
1216  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1217  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1218  * The throttling policy is based on the configured platform data; if no
1219  * platform data is provided, this uses the step_wise throttling policy.
1220  */
1221 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1222 {
1223         handle_thermal_trip(tz, trip);
1224 }
1225 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1226
1227 /**
1228  * thermal_zone_device_register() - register a new thermal zone device
1229  * @type:       the thermal zone device type
1230  * @trips:      the number of trip points the thermal zone support
1231  * @mask:       a bit string indicating the writeablility of trip points
1232  * @devdata:    private device data
1233  * @ops:        standard thermal zone device callbacks
1234  * @tzp:        thermal zone platform parameters
1235  * @passive_delay: number of milliseconds to wait between polls when
1236  *                 performing passive cooling
1237  * @polling_delay: number of milliseconds to wait between polls when checking
1238  *                 whether trip points have been crossed (0 for interrupt
1239  *                 driven systems)
1240  *
1241  * This interface function adds a new thermal zone device (sensor) to
1242  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1243  * thermal cooling devices registered at the same time.
1244  * thermal_zone_device_unregister() must be called when the device is no
1245  * longer needed. The passive cooling depends on the .get_trend() return value.
1246  *
1247  * Return: a pointer to the created struct thermal_zone_device or an
1248  * in case of error, an ERR_PTR. Caller must check return value with
1249  * IS_ERR*() helpers.
1250  */
1251 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1252         int trips, int mask, void *devdata,
1253         struct thermal_zone_device_ops *ops,
1254         struct thermal_zone_params *tzp,
1255         int passive_delay, int polling_delay)
1256 {
1257         struct thermal_zone_device *tz;
1258         enum thermal_trip_type trip_type;
1259         int trip_temp;
1260         int result;
1261         int count;
1262         struct thermal_governor *governor;
1263
1264         if (!type || strlen(type) == 0)
1265                 return ERR_PTR(-EINVAL);
1266
1267         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1268                 return ERR_PTR(-EINVAL);
1269
1270         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1271                 return ERR_PTR(-EINVAL);
1272
1273         if (!ops)
1274                 return ERR_PTR(-EINVAL);
1275
1276         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1277                 return ERR_PTR(-EINVAL);
1278
1279         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1280         if (!tz)
1281                 return ERR_PTR(-ENOMEM);
1282
1283         INIT_LIST_HEAD(&tz->thermal_instances);
1284         idr_init(&tz->idr);
1285         mutex_init(&tz->lock);
1286         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1287         if (result) {
1288                 kfree(tz);
1289                 return ERR_PTR(result);
1290         }
1291
1292         strlcpy(tz->type, type, sizeof(tz->type));
1293         tz->ops = ops;
1294         tz->tzp = tzp;
1295         tz->device.class = &thermal_class;
1296         tz->devdata = devdata;
1297         tz->trips = trips;
1298         tz->passive_delay = passive_delay;
1299         tz->polling_delay = polling_delay;
1300
1301         /* sys I/F */
1302         /* Add nodes that are always present via .groups */
1303         result = thermal_zone_create_device_groups(tz, mask);
1304         if (result)
1305                 goto unregister;
1306
1307         /* A new thermal zone needs to be updated anyway. */
1308         atomic_set(&tz->need_update, 1);
1309
1310         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1311         result = device_register(&tz->device);
1312         if (result) {
1313                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1314                 kfree(tz);
1315                 return ERR_PTR(result);
1316         }
1317
1318         for (count = 0; count < trips; count++) {
1319                 if (tz->ops->get_trip_type(tz, count, &trip_type))
1320                         set_bit(count, &tz->trips_disabled);
1321                 if (tz->ops->get_trip_temp(tz, count, &trip_temp))
1322                         set_bit(count, &tz->trips_disabled);
1323                 /* Check for bogus trip points */
1324                 if (trip_temp == 0)
1325                         set_bit(count, &tz->trips_disabled);
1326         }
1327
1328         /* Update 'this' zone's governor information */
1329         mutex_lock(&thermal_governor_lock);
1330
1331         if (tz->tzp)
1332                 governor = __find_governor(tz->tzp->governor_name);
1333         else
1334                 governor = def_governor;
1335
1336         result = thermal_set_governor(tz, governor);
1337         if (result) {
1338                 mutex_unlock(&thermal_governor_lock);
1339                 goto unregister;
1340         }
1341
1342         mutex_unlock(&thermal_governor_lock);
1343
1344         if (!tz->tzp || !tz->tzp->no_hwmon) {
1345                 result = thermal_add_hwmon_sysfs(tz);
1346                 if (result)
1347                         goto unregister;
1348         }
1349
1350         mutex_lock(&thermal_list_lock);
1351         list_add_tail(&tz->node, &thermal_tz_list);
1352         mutex_unlock(&thermal_list_lock);
1353
1354         /* Bind cooling devices for this zone */
1355         bind_tz(tz);
1356
1357         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1358
1359         thermal_zone_device_reset(tz);
1360         /* Update the new thermal zone and mark it as already updated. */
1361         if (atomic_cmpxchg(&tz->need_update, 1, 0))
1362                 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
1363
1364         return tz;
1365
1366 unregister:
1367         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1368         device_unregister(&tz->device);
1369         return ERR_PTR(result);
1370 }
1371 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1372
1373 /**
1374  * thermal_device_unregister - removes the registered thermal zone device
1375  * @tz: the thermal zone device to remove
1376  */
1377 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1378 {
1379         int i;
1380         const struct thermal_zone_params *tzp;
1381         struct thermal_cooling_device *cdev;
1382         struct thermal_zone_device *pos = NULL;
1383
1384         if (!tz)
1385                 return;
1386
1387         tzp = tz->tzp;
1388
1389         mutex_lock(&thermal_list_lock);
1390         list_for_each_entry(pos, &thermal_tz_list, node)
1391             if (pos == tz)
1392                 break;
1393         if (pos != tz) {
1394                 /* thermal zone device not found */
1395                 mutex_unlock(&thermal_list_lock);
1396                 return;
1397         }
1398         list_del(&tz->node);
1399
1400         /* Unbind all cdevs associated with 'this' thermal zone */
1401         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1402                 if (tz->ops->unbind) {
1403                         tz->ops->unbind(tz, cdev);
1404                         continue;
1405                 }
1406
1407                 if (!tzp || !tzp->tbp)
1408                         break;
1409
1410                 for (i = 0; i < tzp->num_tbps; i++) {
1411                         if (tzp->tbp[i].cdev == cdev) {
1412                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1413                                 tzp->tbp[i].cdev = NULL;
1414                         }
1415                 }
1416         }
1417
1418         mutex_unlock(&thermal_list_lock);
1419
1420         thermal_zone_device_set_polling(tz, 0);
1421
1422         kfree(tz->trip_type_attrs);
1423         kfree(tz->trip_temp_attrs);
1424         kfree(tz->trip_hyst_attrs);
1425         kfree(tz->trips_attribute_group.attrs);
1426         thermal_set_governor(tz, NULL);
1427
1428         thermal_remove_hwmon_sysfs(tz);
1429         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1430         idr_destroy(&tz->idr);
1431         mutex_destroy(&tz->lock);
1432         device_unregister(&tz->device);
1433         kfree(tz->device.groups);
1434 }
1435 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1436
1437 /**
1438  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1439  * @name: thermal zone name to fetch the temperature
1440  *
1441  * When only one zone is found with the passed name, returns a reference to it.
1442  *
1443  * Return: On success returns a reference to an unique thermal zone with
1444  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1445  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1446  */
1447 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1448 {
1449         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1450         unsigned int found = 0;
1451
1452         if (!name)
1453                 goto exit;
1454
1455         mutex_lock(&thermal_list_lock);
1456         list_for_each_entry(pos, &thermal_tz_list, node)
1457                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1458                         found++;
1459                         ref = pos;
1460                 }
1461         mutex_unlock(&thermal_list_lock);
1462
1463         /* nothing has been found, thus an error code for it */
1464         if (found == 0)
1465                 ref = ERR_PTR(-ENODEV);
1466         else if (found > 1)
1467         /* Success only when an unique zone is found */
1468                 ref = ERR_PTR(-EEXIST);
1469
1470 exit:
1471         return ref;
1472 }
1473 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1474
1475 /**
1476  * thermal_zone_get_slope - return the slope attribute of the thermal zone
1477  * @tz: thermal zone device with the slope attribute
1478  *
1479  * Return: If the thermal zone device has a slope attribute, return it, else
1480  * return 1.
1481  */
1482 int thermal_zone_get_slope(struct thermal_zone_device *tz)
1483 {
1484         if (tz && tz->tzp)
1485                 return tz->tzp->slope;
1486         return 1;
1487 }
1488 EXPORT_SYMBOL_GPL(thermal_zone_get_slope);
1489
1490 /**
1491  * thermal_zone_get_offset - return the offset attribute of the thermal zone
1492  * @tz: thermal zone device with the offset attribute
1493  *
1494  * Return: If the thermal zone device has a offset attribute, return it, else
1495  * return 0.
1496  */
1497 int thermal_zone_get_offset(struct thermal_zone_device *tz)
1498 {
1499         if (tz && tz->tzp)
1500                 return tz->tzp->offset;
1501         return 0;
1502 }
1503 EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
1504
1505 #ifdef CONFIG_NET
1506 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1507         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1508 };
1509
1510 static struct genl_family thermal_event_genl_family = {
1511         .id = GENL_ID_GENERATE,
1512         .name = THERMAL_GENL_FAMILY_NAME,
1513         .version = THERMAL_GENL_VERSION,
1514         .maxattr = THERMAL_GENL_ATTR_MAX,
1515         .mcgrps = thermal_event_mcgrps,
1516         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1517 };
1518
1519 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1520                                         enum events event)
1521 {
1522         struct sk_buff *skb;
1523         struct nlattr *attr;
1524         struct thermal_genl_event *thermal_event;
1525         void *msg_header;
1526         int size;
1527         int result;
1528         static unsigned int thermal_event_seqnum;
1529
1530         if (!tz)
1531                 return -EINVAL;
1532
1533         /* allocate memory */
1534         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1535                nla_total_size(0);
1536
1537         skb = genlmsg_new(size, GFP_ATOMIC);
1538         if (!skb)
1539                 return -ENOMEM;
1540
1541         /* add the genetlink message header */
1542         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1543                                  &thermal_event_genl_family, 0,
1544                                  THERMAL_GENL_CMD_EVENT);
1545         if (!msg_header) {
1546                 nlmsg_free(skb);
1547                 return -ENOMEM;
1548         }
1549
1550         /* fill the data */
1551         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1552                            sizeof(struct thermal_genl_event));
1553
1554         if (!attr) {
1555                 nlmsg_free(skb);
1556                 return -EINVAL;
1557         }
1558
1559         thermal_event = nla_data(attr);
1560         if (!thermal_event) {
1561                 nlmsg_free(skb);
1562                 return -EINVAL;
1563         }
1564
1565         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1566
1567         thermal_event->orig = tz->id;
1568         thermal_event->event = event;
1569
1570         /* send multicast genetlink message */
1571         genlmsg_end(skb, msg_header);
1572
1573         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
1574                                    0, GFP_ATOMIC);
1575         if (result)
1576                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1577
1578         return result;
1579 }
1580 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
1581
1582 static int genetlink_init(void)
1583 {
1584         return genl_register_family(&thermal_event_genl_family);
1585 }
1586
1587 static void genetlink_exit(void)
1588 {
1589         genl_unregister_family(&thermal_event_genl_family);
1590 }
1591 #else /* !CONFIG_NET */
1592 static inline int genetlink_init(void) { return 0; }
1593 static inline void genetlink_exit(void) {}
1594 #endif /* !CONFIG_NET */
1595
1596 static int __init thermal_register_governors(void)
1597 {
1598         int result;
1599
1600         result = thermal_gov_step_wise_register();
1601         if (result)
1602                 return result;
1603
1604         result = thermal_gov_fair_share_register();
1605         if (result)
1606                 return result;
1607
1608         result = thermal_gov_bang_bang_register();
1609         if (result)
1610                 return result;
1611
1612         result = thermal_gov_user_space_register();
1613         if (result)
1614                 return result;
1615
1616         return thermal_gov_power_allocator_register();
1617 }
1618
1619 static void thermal_unregister_governors(void)
1620 {
1621         thermal_gov_step_wise_unregister();
1622         thermal_gov_fair_share_unregister();
1623         thermal_gov_bang_bang_unregister();
1624         thermal_gov_user_space_unregister();
1625         thermal_gov_power_allocator_unregister();
1626 }
1627
1628 static int thermal_pm_notify(struct notifier_block *nb,
1629                                 unsigned long mode, void *_unused)
1630 {
1631         struct thermal_zone_device *tz;
1632
1633         switch (mode) {
1634         case PM_HIBERNATION_PREPARE:
1635         case PM_RESTORE_PREPARE:
1636         case PM_SUSPEND_PREPARE:
1637                 atomic_set(&in_suspend, 1);
1638                 break;
1639         case PM_POST_HIBERNATION:
1640         case PM_POST_RESTORE:
1641         case PM_POST_SUSPEND:
1642                 atomic_set(&in_suspend, 0);
1643                 list_for_each_entry(tz, &thermal_tz_list, node) {
1644                         thermal_zone_device_reset(tz);
1645                         thermal_zone_device_update(tz,
1646                                                    THERMAL_EVENT_UNSPECIFIED);
1647                 }
1648                 break;
1649         default:
1650                 break;
1651         }
1652         return 0;
1653 }
1654
1655 static struct notifier_block thermal_pm_nb = {
1656         .notifier_call = thermal_pm_notify,
1657 };
1658
1659 static int __init thermal_init(void)
1660 {
1661         int result;
1662
1663         result = thermal_register_governors();
1664         if (result)
1665                 goto error;
1666
1667         result = class_register(&thermal_class);
1668         if (result)
1669                 goto unregister_governors;
1670
1671         result = genetlink_init();
1672         if (result)
1673                 goto unregister_class;
1674
1675         result = of_parse_thermal_zones();
1676         if (result)
1677                 goto exit_netlink;
1678
1679         result = register_pm_notifier(&thermal_pm_nb);
1680         if (result)
1681                 pr_warn("Thermal: Can not register suspend notifier, return %d\n",
1682                         result);
1683
1684         return 0;
1685
1686 exit_netlink:
1687         genetlink_exit();
1688 unregister_class:
1689         class_unregister(&thermal_class);
1690 unregister_governors:
1691         thermal_unregister_governors();
1692 error:
1693         idr_destroy(&thermal_tz_idr);
1694         idr_destroy(&thermal_cdev_idr);
1695         mutex_destroy(&thermal_idr_lock);
1696         mutex_destroy(&thermal_list_lock);
1697         mutex_destroy(&thermal_governor_lock);
1698         return result;
1699 }
1700
1701 static void __exit thermal_exit(void)
1702 {
1703         unregister_pm_notifier(&thermal_pm_nb);
1704         of_thermal_destroy_zones();
1705         genetlink_exit();
1706         class_unregister(&thermal_class);
1707         thermal_unregister_governors();
1708         idr_destroy(&thermal_tz_idr);
1709         idr_destroy(&thermal_cdev_idr);
1710         mutex_destroy(&thermal_idr_lock);
1711         mutex_destroy(&thermal_list_lock);
1712         mutex_destroy(&thermal_governor_lock);
1713 }
1714
1715 fs_initcall(thermal_init);
1716 module_exit(thermal_exit);