drivers/thermal/thermal_core.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/reboot.h>
  36 #include <linux/string.h>
  37 #include <linux/of.h>
  38 #include <net/netlink.h>
  39 #include <net/genetlink.h>
  40
  41 #define CREATE_TRACE_POINTS
  42 #include <trace/events/thermal.h>
  43
  44 #include "thermal_core.h"
  45 #include "thermal_hwmon.h"
  46
  47 MODULE_AUTHOR("Zhang Rui");
  48 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  49 MODULE_LICENSE("GPL v2");
  50
  51 static DEFINE_IDR(thermal_tz_idr);
  52 static DEFINE_IDR(thermal_cdev_idr);
  53 static DEFINE_MUTEX(thermal_idr_lock);
  54
  55 static LIST_HEAD(thermal_tz_list);
  56 static LIST_HEAD(thermal_cdev_list);
  57 static LIST_HEAD(thermal_governor_list);
  58
  59 static DEFINE_MUTEX(thermal_list_lock);
  60 static DEFINE_MUTEX(thermal_governor_lock);
  61
  62 static struct thermal_governor *def_governor;
  63
  64 static struct thermal_governor *__find_governor(const char *name)
  65 {
  66         struct thermal_governor *pos;
  67
  68         if (!name || !name[0])
  69                 return def_governor;
  70
  71         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  72                 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
  73                         return pos;
  74
  75         return NULL;
  76 }
  77
  78 /**
  79  * bind_previous_governor() - bind the previous governor of the thermal zone
  80  * @tz:         a valid pointer to a struct thermal_zone_device
  81  * @failed_gov_name:    the name of the governor that failed to register
  82  *
  83  * Register the previous governor of the thermal zone after a new
  84  * governor has failed to be bound.
  85  */
  86 static void bind_previous_governor(struct thermal_zone_device *tz,
  87                                    const char *failed_gov_name)
  88 {
  89         if (tz->governor && tz->governor->bind_to_tz) {
  90                 if (tz->governor->bind_to_tz(tz)) {
  91                         dev_err(&tz->device,
  92                                 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
  93                                 failed_gov_name, tz->governor->name, tz->type);
  94                         tz->governor = NULL;
  95                 }
  96         }
  97 }
  98
  99 /**
 100  * thermal_set_governor() - Switch to another governor
 101  * @tz:         a valid pointer to a struct thermal_zone_device
 102  * @new_gov:    pointer to the new governor
 103  *
 104  * Change the governor of thermal zone @tz.
 105  *
 106  * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
 107  */
 108 static int thermal_set_governor(struct thermal_zone_device *tz,
 109                                 struct thermal_governor *new_gov)
 110 {
 111         int ret = 0;
 112
 113         if (tz->governor && tz->governor->unbind_from_tz)
 114                 tz->governor->unbind_from_tz(tz);
 115
 116         if (new_gov && new_gov->bind_to_tz) {
 117                 ret = new_gov->bind_to_tz(tz);
 118                 if (ret) {
 119                         bind_previous_governor(tz, new_gov->name);
 120
 121                         return ret;
 122                 }
 123         }
 124
 125         tz->governor = new_gov;
 126
 127         return ret;
 128 }
 129
 130 int thermal_register_governor(struct thermal_governor *governor)
 131 {
 132         int err;
 133         const char *name;
 134         struct thermal_zone_device *pos;
 135
 136         if (!governor)
 137                 return -EINVAL;
 138
 139         mutex_lock(&thermal_governor_lock);
 140
 141         err = -EBUSY;
 142         if (__find_governor(governor->name) == NULL) {
 143                 err = 0;
 144                 list_add(&governor->governor_list, &thermal_governor_list);
 145                 if (!def_governor && !strncmp(governor->name,
 146                         DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
 147                         def_governor = governor;
 148         }
 149
 150         mutex_lock(&thermal_list_lock);
 151
 152         list_for_each_entry(pos, &thermal_tz_list, node) {
 153                 /*
 154                  * only thermal zones with specified tz->tzp->governor_name
 155                  * may run with tz->govenor unset
 156                  */
 157                 if (pos->governor)
 158                         continue;
 159
 160                 name = pos->tzp->governor_name;
 161
 162                 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
 163                         int ret;
 164
 165                         ret = thermal_set_governor(pos, governor);
 166                         if (ret)
 167                                 dev_err(&pos->device,
 168                                         "Failed to set governor %s for thermal zone %s: %d\n",
 169                                         governor->name, pos->type, ret);
 170                 }
 171         }
 172
 173         mutex_unlock(&thermal_list_lock);
 174         mutex_unlock(&thermal_governor_lock);
 175
 176         return err;
 177 }
 178
 179 void thermal_unregister_governor(struct thermal_governor *governor)
 180 {
 181         struct thermal_zone_device *pos;
 182
 183         if (!governor)
 184                 return;
 185
 186         mutex_lock(&thermal_governor_lock);
 187
 188         if (__find_governor(governor->name) == NULL)
 189                 goto exit;
 190
 191         mutex_lock(&thermal_list_lock);
 192
 193         list_for_each_entry(pos, &thermal_tz_list, node) {
 194                 if (!strncasecmp(pos->governor->name, governor->name,
 195                                                 THERMAL_NAME_LENGTH))
 196                         thermal_set_governor(pos, NULL);
 197         }
 198
 199         mutex_unlock(&thermal_list_lock);
 200         list_del(&governor->governor_list);
 201 exit:
 202         mutex_unlock(&thermal_governor_lock);
 203         return;
 204 }
 205
 206 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 207 {
 208         int ret;
 209
 210         if (lock)
 211                 mutex_lock(lock);
 212         ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
 213         if (lock)
 214                 mutex_unlock(lock);
 215         if (unlikely(ret < 0))
 216                 return ret;
 217         *id = ret;
 218         return 0;
 219 }
 220
 221 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 222 {
 223         if (lock)
 224                 mutex_lock(lock);
 225         idr_remove(idr, id);
 226         if (lock)
 227                 mutex_unlock(lock);
 228 }
 229
 230 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 231 {
 232         enum thermal_trend trend;
 233
 234         if (tz->emul_temperature || !tz->ops->get_trend ||
 235             tz->ops->get_trend(tz, trip, &trend)) {
 236                 if (tz->temperature > tz->last_temperature)
 237                         trend = THERMAL_TREND_RAISING;
 238                 else if (tz->temperature < tz->last_temperature)
 239                         trend = THERMAL_TREND_DROPPING;
 240                 else
 241                         trend = THERMAL_TREND_STABLE;
 242         }
 243
 244         return trend;
 245 }
 246 EXPORT_SYMBOL(get_tz_trend);
 247
 248 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 249                         struct thermal_cooling_device *cdev, int trip)
 250 {
 251         struct thermal_instance *pos = NULL;
 252         struct thermal_instance *target_instance = NULL;
 253
 254         mutex_lock(&tz->lock);
 255         mutex_lock(&cdev->lock);
 256
 257         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 258                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 259                         target_instance = pos;
 260                         break;
 261                 }
 262         }
 263
 264         mutex_unlock(&cdev->lock);
 265         mutex_unlock(&tz->lock);
 266
 267         return target_instance;
 268 }
 269 EXPORT_SYMBOL(get_thermal_instance);
 270
 271 static void print_bind_err_msg(struct thermal_zone_device *tz,
 272                         struct thermal_cooling_device *cdev, int ret)
 273 {
 274         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 275                                 tz->type, cdev->type, ret);
 276 }
 277
 278 static void __bind(struct thermal_zone_device *tz, int mask,
 279                         struct thermal_cooling_device *cdev,
 280                         unsigned long *limits,
 281                         unsigned int weight)
 282 {
 283         int i, ret;
 284
 285         for (i = 0; i < tz->trips; i++) {
 286                 if (mask & (1 << i)) {
 287                         unsigned long upper, lower;
 288
 289                         upper = THERMAL_NO_LIMIT;
 290                         lower = THERMAL_NO_LIMIT;
 291                         if (limits) {
 292                                 lower = limits[i * 2];
 293                                 upper = limits[i * 2 + 1];
 294                         }
 295                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 296                                                                upper, lower,
 297                                                                weight);
 298                         if (ret)
 299                                 print_bind_err_msg(tz, cdev, ret);
 300                 }
 301         }
 302 }
 303
 304 static void __unbind(struct thermal_zone_device *tz, int mask,
 305                         struct thermal_cooling_device *cdev)
 306 {
 307         int i;
 308
 309         for (i = 0; i < tz->trips; i++)
 310                 if (mask & (1 << i))
 311                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 312 }
 313
 314 static void bind_cdev(struct thermal_cooling_device *cdev)
 315 {
 316         int i, ret;
 317         const struct thermal_zone_params *tzp;
 318         struct thermal_zone_device *pos = NULL;
 319
 320         mutex_lock(&thermal_list_lock);
 321
 322         list_for_each_entry(pos, &thermal_tz_list, node) {
 323                 if (!pos->tzp && !pos->ops->bind)
 324                         continue;
 325
 326                 if (pos->ops->bind) {
 327                         ret = pos->ops->bind(pos, cdev);
 328                         if (ret)
 329                                 print_bind_err_msg(pos, cdev, ret);
 330                         continue;
 331                 }
 332
 333                 tzp = pos->tzp;
 334                 if (!tzp || !tzp->tbp)
 335                         continue;
 336
 337                 for (i = 0; i < tzp->num_tbps; i++) {
 338                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 339                                 continue;
 340                         if (tzp->tbp[i].match(pos, cdev))
 341                                 continue;
 342                         tzp->tbp[i].cdev = cdev;
 343                         __bind(pos, tzp->tbp[i].trip_mask, cdev,
 344                                tzp->tbp[i].binding_limits,
 345                                tzp->tbp[i].weight);
 346                 }
 347         }
 348
 349         mutex_unlock(&thermal_list_lock);
 350 }
 351
 352 static void bind_tz(struct thermal_zone_device *tz)
 353 {
 354         int i, ret;
 355         struct thermal_cooling_device *pos = NULL;
 356         const struct thermal_zone_params *tzp = tz->tzp;
 357
 358         if (!tzp && !tz->ops->bind)
 359                 return;
 360
 361         mutex_lock(&thermal_list_lock);
 362
 363         /* If there is ops->bind, try to use ops->bind */
 364         if (tz->ops->bind) {
 365                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 366                         ret = tz->ops->bind(tz, pos);
 367                         if (ret)
 368                                 print_bind_err_msg(tz, pos, ret);
 369                 }
 370                 goto exit;
 371         }
 372
 373         if (!tzp || !tzp->tbp)
 374                 goto exit;
 375
 376         list_for_each_entry(pos, &thermal_cdev_list, node) {
 377                 for (i = 0; i < tzp->num_tbps; i++) {
 378                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 379                                 continue;
 380                         if (tzp->tbp[i].match(tz, pos))
 381                                 continue;
 382                         tzp->tbp[i].cdev = pos;
 383                         __bind(tz, tzp->tbp[i].trip_mask, pos,
 384                                tzp->tbp[i].binding_limits,
 385                                tzp->tbp[i].weight);
 386                 }
 387         }
 388 exit:
 389         mutex_unlock(&thermal_list_lock);
 390 }
 391
 392 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 393                                             int delay)
 394 {
 395         if (delay > 1000)
 396                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 397                                  round_jiffies(msecs_to_jiffies(delay)));
 398         else if (delay)
 399                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 400                                  msecs_to_jiffies(delay));
 401         else
 402                 cancel_delayed_work(&tz->poll_queue);
 403 }
 404
 405 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 406 {
 407         mutex_lock(&tz->lock);
 408
 409         if (tz->passive)
 410                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 411         else if (tz->polling_delay)
 412                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 413         else
 414                 thermal_zone_device_set_polling(tz, 0);
 415
 416         mutex_unlock(&tz->lock);
 417 }
 418
 419 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 420                         int trip, enum thermal_trip_type trip_type)
 421 {
 422         tz->governor ? tz->governor->throttle(tz, trip) :
 423                        def_governor->throttle(tz, trip);
 424 }
 425
 426 static void handle_critical_trips(struct thermal_zone_device *tz,
 427                                 int trip, enum thermal_trip_type trip_type)
 428 {
 429         long trip_temp;
 430
 431         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 432
 433         /* If we have not crossed the trip_temp, we do not care. */
 434         if (trip_temp <= 0 || tz->temperature < trip_temp)
 435                 return;
 436
 437         trace_thermal_zone_trip(tz, trip, trip_type);
 438
 439         if (tz->ops->notify)
 440                 tz->ops->notify(tz, trip, trip_type);
 441
 442         if (trip_type == THERMAL_TRIP_CRITICAL) {
 443                 dev_emerg(&tz->device,
 444                           "critical temperature reached(%d C),shutting down\n",
 445                           tz->temperature / 1000);
 446                 orderly_poweroff(true);
 447         }
 448 }
 449
 450 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 451 {
 452         enum thermal_trip_type type;
 453
 454         tz->ops->get_trip_type(tz, trip, &type);
 455
 456         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 457                 handle_critical_trips(tz, trip, type);
 458         else
 459                 handle_non_critical_trips(tz, trip, type);
 460         /*
 461          * Alright, we handled this trip successfully.
 462          * So, start monitoring again.
 463          */
 464         monitor_thermal_zone(tz);
 465 }
 466
 467 /**
 468  * thermal_zone_get_temp() - returns its the temperature of thermal zone
 469  * @tz: a valid pointer to a struct thermal_zone_device
 470  * @temp: a valid pointer to where to store the resulting temperature.
 471  *
 472  * When a valid thermal zone reference is passed, it will fetch its
 473  * temperature and fill @temp.
 474  *
 475  * Return: On success returns 0, an error code otherwise
 476  */
 477 int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 478 {
 479         int ret = -EINVAL;
 480 #ifdef CONFIG_THERMAL_EMULATION
 481         int count;
 482         unsigned long crit_temp = -1UL;
 483         enum thermal_trip_type type;
 484 #endif
 485
 486         if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 487                 goto exit;
 488
 489         mutex_lock(&tz->lock);
 490
 491         ret = tz->ops->get_temp(tz, temp);
 492 #ifdef CONFIG_THERMAL_EMULATION
 493         if (!tz->emul_temperature)
 494                 goto skip_emul;
 495
 496         for (count = 0; count < tz->trips; count++) {
 497                 ret = tz->ops->get_trip_type(tz, count, &type);
 498                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 499                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 500                         break;
 501                 }
 502         }
 503
 504         if (ret)
 505                 goto skip_emul;
 506
 507         if (*temp < crit_temp)
 508                 *temp = tz->emul_temperature;
 509 skip_emul:
 510 #endif
 511         mutex_unlock(&tz->lock);
 512 exit:
 513         return ret;
 514 }
 515 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 516
 517 static void update_temperature(struct thermal_zone_device *tz)
 518 {
 519         long temp;
 520         int ret;
 521
 522         ret = thermal_zone_get_temp(tz, &temp);
 523         if (ret) {
 524                 if (ret != -EAGAIN)
 525                         dev_warn(&tz->device,
 526                                  "failed to read out thermal zone (%d)\n",
 527                                  ret);
 528                 return;
 529         }
 530
 531         mutex_lock(&tz->lock);
 532         tz->last_temperature = tz->temperature;
 533         tz->temperature = temp;
 534         mutex_unlock(&tz->lock);
 535
 536         trace_thermal_temperature(tz);
 537         dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
 538                                 tz->last_temperature, tz->temperature);
 539 }
 540
 541 void thermal_zone_device_update(struct thermal_zone_device *tz)
 542 {
 543         int count;
 544
 545         if (!tz->ops->get_temp)
 546                 return;
 547
 548         update_temperature(tz);
 549
 550         for (count = 0; count < tz->trips; count++)
 551                 handle_thermal_trip(tz, count);
 552 }
 553 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 554
 555 static void thermal_zone_device_check(struct work_struct *work)
 556 {
 557         struct thermal_zone_device *tz = container_of(work, struct
 558                                                       thermal_zone_device,
 559                                                       poll_queue.work);
 560         thermal_zone_device_update(tz);
 561 }
 562
 563 /* sys I/F for thermal zone */
 564
 565 #define to_thermal_zone(_dev) \
 566         container_of(_dev, struct thermal_zone_device, device)
 567
 568 static ssize_t
 569 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 570 {
 571         struct thermal_zone_device *tz = to_thermal_zone(dev);
 572
 573         return sprintf(buf, "%s\n", tz->type);
 574 }
 575
 576 static ssize_t
 577 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 578 {
 579         struct thermal_zone_device *tz = to_thermal_zone(dev);
 580         long temperature;
 581         int ret;
 582
 583         ret = thermal_zone_get_temp(tz, &temperature);
 584
 585         if (ret)
 586                 return ret;
 587
 588         return sprintf(buf, "%ld\n", temperature);
 589 }
 590
 591 static ssize_t
 592 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 593 {
 594         struct thermal_zone_device *tz = to_thermal_zone(dev);
 595         enum thermal_device_mode mode;
 596         int result;
 597
 598         if (!tz->ops->get_mode)
 599                 return -EPERM;
 600
 601         result = tz->ops->get_mode(tz, &mode);
 602         if (result)
 603                 return result;
 604
 605         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 606                        : "disabled");
 607 }
 608
 609 static ssize_t
 610 mode_store(struct device *dev, struct device_attribute *attr,
 611            const char *buf, size_t count)
 612 {
 613         struct thermal_zone_device *tz = to_thermal_zone(dev);
 614         int result;
 615
 616         if (!tz->ops->set_mode)
 617                 return -EPERM;
 618
 619         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 620                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 621         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 622                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 623         else
 624                 result = -EINVAL;
 625
 626         if (result)
 627                 return result;
 628
 629         return count;
 630 }
 631
 632 static ssize_t
 633 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 634                      char *buf)
 635 {
 636         struct thermal_zone_device *tz = to_thermal_zone(dev);
 637         enum thermal_trip_type type;
 638         int trip, result;
 639
 640         if (!tz->ops->get_trip_type)
 641                 return -EPERM;
 642
 643         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 644                 return -EINVAL;
 645
 646         result = tz->ops->get_trip_type(tz, trip, &type);
 647         if (result)
 648                 return result;
 649
 650         switch (type) {
 651         case THERMAL_TRIP_CRITICAL:
 652                 return sprintf(buf, "critical\n");
 653         case THERMAL_TRIP_HOT:
 654                 return sprintf(buf, "hot\n");
 655         case THERMAL_TRIP_PASSIVE:
 656                 return sprintf(buf, "passive\n");
 657         case THERMAL_TRIP_ACTIVE:
 658                 return sprintf(buf, "active\n");
 659         default:
 660                 return sprintf(buf, "unknown\n");
 661         }
 662 }
 663
 664 static ssize_t
 665 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 666                      const char *buf, size_t count)
 667 {
 668         struct thermal_zone_device *tz = to_thermal_zone(dev);
 669         int trip, ret;
 670         unsigned long temperature;
 671
 672         if (!tz->ops->set_trip_temp)
 673                 return -EPERM;
 674
 675         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 676                 return -EINVAL;
 677
 678         if (kstrtoul(buf, 10, &temperature))
 679                 return -EINVAL;
 680
 681         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 682
 683         return ret ? ret : count;
 684 }
 685
 686 static ssize_t
 687 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 688                      char *buf)
 689 {
 690         struct thermal_zone_device *tz = to_thermal_zone(dev);
 691         int trip, ret;
 692         long temperature;
 693
 694         if (!tz->ops->get_trip_temp)
 695                 return -EPERM;
 696
 697         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 698                 return -EINVAL;
 699
 700         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 701
 702         if (ret)
 703                 return ret;
 704
 705         return sprintf(buf, "%ld\n", temperature);
 706 }
 707
 708 static ssize_t
 709 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 710                         const char *buf, size_t count)
 711 {
 712         struct thermal_zone_device *tz = to_thermal_zone(dev);
 713         int trip, ret;
 714         unsigned long temperature;
 715
 716         if (!tz->ops->set_trip_hyst)
 717                 return -EPERM;
 718
 719         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 720                 return -EINVAL;
 721
 722         if (kstrtoul(buf, 10, &temperature))
 723                 return -EINVAL;
 724
 725         /*
 726          * We are not doing any check on the 'temperature' value
 727          * here. The driver implementing 'set_trip_hyst' has to
 728          * take care of this.
 729          */
 730         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 731
 732         return ret ? ret : count;
 733 }
 734
 735 static ssize_t
 736 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 737                         char *buf)
 738 {
 739         struct thermal_zone_device *tz = to_thermal_zone(dev);
 740         int trip, ret;
 741         unsigned long temperature;
 742
 743         if (!tz->ops->get_trip_hyst)
 744                 return -EPERM;
 745
 746         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 747                 return -EINVAL;
 748
 749         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 750
 751         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 752 }
 753
 754 static ssize_t
 755 passive_store(struct device *dev, struct device_attribute *attr,
 756                     const char *buf, size_t count)
 757 {
 758         struct thermal_zone_device *tz = to_thermal_zone(dev);
 759         struct thermal_cooling_device *cdev = NULL;
 760         int state;
 761
 762         if (!sscanf(buf, "%d\n", &state))
 763                 return -EINVAL;
 764
 765         /* sanity check: values below 1000 millicelcius don't make sense
 766          * and can cause the system to go into a thermal heart attack
 767          */
 768         if (state && state < 1000)
 769                 return -EINVAL;
 770
 771         if (state && !tz->forced_passive) {
 772                 mutex_lock(&thermal_list_lock);
 773                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 774                         if (!strncmp("Processor", cdev->type,
 775                                      sizeof("Processor")))
 776                                 thermal_zone_bind_cooling_device(tz,
 777                                                 THERMAL_TRIPS_NONE, cdev,
 778                                                 THERMAL_NO_LIMIT,
 779                                                 THERMAL_NO_LIMIT,
 780                                                 THERMAL_WEIGHT_DEFAULT);
 781                 }
 782                 mutex_unlock(&thermal_list_lock);
 783                 if (!tz->passive_delay)
 784                         tz->passive_delay = 1000;
 785         } else if (!state && tz->forced_passive) {
 786                 mutex_lock(&thermal_list_lock);
 787                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 788                         if (!strncmp("Processor", cdev->type,
 789                                      sizeof("Processor")))
 790                                 thermal_zone_unbind_cooling_device(tz,
 791                                                                    THERMAL_TRIPS_NONE,
 792                                                                    cdev);
 793                 }
 794                 mutex_unlock(&thermal_list_lock);
 795                 tz->passive_delay = 0;
 796         }
 797
 798         tz->forced_passive = state;
 799
 800         thermal_zone_device_update(tz);
 801
 802         return count;
 803 }
 804
 805 static ssize_t
 806 passive_show(struct device *dev, struct device_attribute *attr,
 807                    char *buf)
 808 {
 809         struct thermal_zone_device *tz = to_thermal_zone(dev);
 810
 811         return sprintf(buf, "%d\n", tz->forced_passive);
 812 }
 813
 814 static ssize_t
 815 policy_store(struct device *dev, struct device_attribute *attr,
 816                     const char *buf, size_t count)
 817 {
 818         int ret = -EINVAL;
 819         struct thermal_zone_device *tz = to_thermal_zone(dev);
 820         struct thermal_governor *gov;
 821         char name[THERMAL_NAME_LENGTH];
 822
 823         snprintf(name, sizeof(name), "%s", buf);
 824
 825         mutex_lock(&thermal_governor_lock);
 826         mutex_lock(&tz->lock);
 827
 828         gov = __find_governor(strim(name));
 829         if (!gov)
 830                 goto exit;
 831
 832         ret = thermal_set_governor(tz, gov);
 833         if (!ret)
 834                 ret = count;
 835
 836 exit:
 837         mutex_unlock(&tz->lock);
 838         mutex_unlock(&thermal_governor_lock);
 839         return ret;
 840 }
 841
 842 static ssize_t
 843 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 844 {
 845         struct thermal_zone_device *tz = to_thermal_zone(dev);
 846
 847         return sprintf(buf, "%s\n", tz->governor->name);
 848 }
 849
 850 #ifdef CONFIG_THERMAL_EMULATION
 851 static ssize_t
 852 emul_temp_store(struct device *dev, struct device_attribute *attr,
 853                      const char *buf, size_t count)
 854 {
 855         struct thermal_zone_device *tz = to_thermal_zone(dev);
 856         int ret = 0;
 857         unsigned long temperature;
 858
 859         if (kstrtoul(buf, 10, &temperature))
 860                 return -EINVAL;
 861
 862         if (!tz->ops->set_emul_temp) {
 863                 mutex_lock(&tz->lock);
 864                 tz->emul_temperature = temperature;
 865                 mutex_unlock(&tz->lock);
 866         } else {
 867                 ret = tz->ops->set_emul_temp(tz, temperature);
 868         }
 869
 870         if (!ret)
 871                 thermal_zone_device_update(tz);
 872
 873         return ret ? ret : count;
 874 }
 875 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 876 #endif/*CONFIG_THERMAL_EMULATION*/
 877
 878 static ssize_t
 879 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
 880                        char *buf)
 881 {
 882         struct thermal_zone_device *tz = to_thermal_zone(dev);
 883
 884         if (tz->tzp)
 885                 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
 886         else
 887                 return -EIO;
 888 }
 889
 890 static ssize_t
 891 sustainable_power_store(struct device *dev, struct device_attribute *devattr,
 892                         const char *buf, size_t count)
 893 {
 894         struct thermal_zone_device *tz = to_thermal_zone(dev);
 895         u32 sustainable_power;
 896
 897         if (!tz->tzp)
 898                 return -EIO;
 899
 900         if (kstrtou32(buf, 10, &sustainable_power))
 901                 return -EINVAL;
 902
 903         tz->tzp->sustainable_power = sustainable_power;
 904
 905         return count;
 906 }
 907 static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
 908                 sustainable_power_store);
 909
 910 #define create_s32_tzp_attr(name)                                       \
 911         static ssize_t                                                  \
 912         name##_show(struct device *dev, struct device_attribute *devattr, \
 913                 char *buf)                                              \
 914         {                                                               \
 915         struct thermal_zone_device *tz = to_thermal_zone(dev);          \
 916                                                                         \
 917         if (tz->tzp)                                                    \
 918                 return sprintf(buf, "%u\n", tz->tzp->name);             \
 919         else                                                            \
 920                 return -EIO;                                            \
 921         }                                                               \
 922                                                                         \
 923         static ssize_t                                                  \
 924         name##_store(struct device *dev, struct device_attribute *devattr, \
 925                 const char *buf, size_t count)                          \
 926         {                                                               \
 927                 struct thermal_zone_device *tz = to_thermal_zone(dev);  \
 928                 s32 value;                                              \
 929                                                                         \
 930                 if (!tz->tzp)                                           \
 931                         return -EIO;                                    \
 932                                                                         \
 933                 if (kstrtos32(buf, 10, &value))                         \
 934                         return -EINVAL;                                 \
 935                                                                         \
 936                 tz->tzp->name = value;                                  \
 937                                                                         \
 938                 return count;                                           \
 939         }                                                               \
 940         static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
 941
 942 create_s32_tzp_attr(k_po);
 943 create_s32_tzp_attr(k_pu);
 944 create_s32_tzp_attr(k_i);
 945 create_s32_tzp_attr(k_d);
 946 create_s32_tzp_attr(integral_cutoff);
 947 create_s32_tzp_attr(slope);
 948 create_s32_tzp_attr(offset);
 949 #undef create_s32_tzp_attr
 950
 951 static struct device_attribute *dev_tzp_attrs[] = {
 952         &dev_attr_sustainable_power,
 953         &dev_attr_k_po,
 954         &dev_attr_k_pu,
 955         &dev_attr_k_i,
 956         &dev_attr_k_d,
 957         &dev_attr_integral_cutoff,
 958         &dev_attr_slope,
 959         &dev_attr_offset,
 960 };
 961
 962 static int create_tzp_attrs(struct device *dev)
 963 {
 964         int i;
 965
 966         for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
 967                 int ret;
 968                 struct device_attribute *dev_attr = dev_tzp_attrs[i];
 969
 970                 ret = device_create_file(dev, dev_attr);
 971                 if (ret)
 972                         return ret;
 973         }
 974
 975         return 0;
 976 }
 977
 978 /**
 979  * power_actor_get_max_power() - get the maximum power that a cdev can consume
 980  * @cdev:       pointer to &thermal_cooling_device
 981  * @tz:         a valid thermal zone device pointer
 982  * @max_power:  pointer in which to store the maximum power
 983  *
 984  * Calculate the maximum power consumption in milliwats that the
 985  * cooling device can currently consume and store it in @max_power.
 986  *
 987  * Return: 0 on success, -EINVAL if @cdev doesn't support the
 988  * power_actor API or -E* on other error.
 989  */
 990 int power_actor_get_max_power(struct thermal_cooling_device *cdev,
 991                               struct thermal_zone_device *tz, u32 *max_power)
 992 {
 993         if (!cdev_is_power_actor(cdev))
 994                 return -EINVAL;
 995
 996         return cdev->ops->state2power(cdev, tz, 0, max_power);
 997 }
 998
 999 /**
1000  * power_actor_set_power() - limit the maximum power that a cooling device can consume
1001  * @cdev:       pointer to &thermal_cooling_device
1002  * @instance:   thermal instance to update
1003  * @power:      the power in milliwatts
1004  *
1005  * Set the cooling device to consume at most @power milliwatts.
1006  *
1007  * Return: 0 on success, -EINVAL if the cooling device does not
1008  * implement the power actor API or -E* for other failures.
1009  */
1010 int power_actor_set_power(struct thermal_cooling_device *cdev,
1011                           struct thermal_instance *instance, u32 power)
1012 {
1013         unsigned long state;
1014         int ret;
1015
1016         if (!cdev_is_power_actor(cdev))
1017                 return -EINVAL;
1018
1019         ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1020         if (ret)
1021                 return ret;
1022
1023         instance->target = state;
1024         cdev->updated = false;
1025         thermal_cdev_update(cdev);
1026
1027         return 0;
1028 }
1029
1030 static DEVICE_ATTR(type, 0444, type_show, NULL);
1031 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1032 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
1033 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
1034 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
1035
1036 /* sys I/F for cooling device */
1037 #define to_cooling_device(_dev) \
1038         container_of(_dev, struct thermal_cooling_device, device)
1039
1040 static ssize_t
1041 thermal_cooling_device_type_show(struct device *dev,
1042                                  struct device_attribute *attr, char *buf)
1043 {
1044         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1045
1046         return sprintf(buf, "%s\n", cdev->type);
1047 }
1048
1049 static ssize_t
1050 thermal_cooling_device_max_state_show(struct device *dev,
1051                                       struct device_attribute *attr, char *buf)
1052 {
1053         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1054         unsigned long state;
1055         int ret;
1056
1057         ret = cdev->ops->get_max_state(cdev, &state);
1058         if (ret)
1059                 return ret;
1060         return sprintf(buf, "%ld\n", state);
1061 }
1062
1063 static ssize_t
1064 thermal_cooling_device_cur_state_show(struct device *dev,
1065                                       struct device_attribute *attr, char *buf)
1066 {
1067         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1068         unsigned long state;
1069         int ret;
1070
1071         ret = cdev->ops->get_cur_state(cdev, &state);
1072         if (ret)
1073                 return ret;
1074         return sprintf(buf, "%ld\n", state);
1075 }
1076
1077 static ssize_t
1078 thermal_cooling_device_cur_state_store(struct device *dev,
1079                                        struct device_attribute *attr,
1080                                        const char *buf, size_t count)
1081 {
1082         struct thermal_cooling_device *cdev = to_cooling_device(dev);
1083         unsigned long state;
1084         int result;
1085
1086         if (!sscanf(buf, "%ld\n", &state))
1087                 return -EINVAL;
1088
1089         if ((long)state < 0)
1090                 return -EINVAL;
1091
1092         result = cdev->ops->set_cur_state(cdev, state);
1093         if (result)
1094                 return result;
1095         return count;
1096 }
1097
1098 static struct device_attribute dev_attr_cdev_type =
1099 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
1100 static DEVICE_ATTR(max_state, 0444,
1101                    thermal_cooling_device_max_state_show, NULL);
1102 static DEVICE_ATTR(cur_state, 0644,
1103                    thermal_cooling_device_cur_state_show,
1104                    thermal_cooling_device_cur_state_store);
1105
1106 static ssize_t
1107 thermal_cooling_device_trip_point_show(struct device *dev,
1108                                        struct device_attribute *attr, char *buf)
1109 {
1110         struct thermal_instance *instance;
1111
1112         instance =
1113             container_of(attr, struct thermal_instance, attr);
1114
1115         if (instance->trip == THERMAL_TRIPS_NONE)
1116                 return sprintf(buf, "-1\n");
1117         else
1118                 return sprintf(buf, "%d\n", instance->trip);
1119 }
1120
1121 static struct attribute *cooling_device_attrs[] = {
1122         &dev_attr_cdev_type.attr,
1123         &dev_attr_max_state.attr,
1124         &dev_attr_cur_state.attr,
1125         NULL,
1126 };
1127
1128 static const struct attribute_group cooling_device_attr_group = {
1129         .attrs = cooling_device_attrs,
1130 };
1131
1132 static const struct attribute_group *cooling_device_attr_groups[] = {
1133         &cooling_device_attr_group,
1134         NULL,
1135 };
1136
1137 static ssize_t
1138 thermal_cooling_device_weight_show(struct device *dev,
1139                                    struct device_attribute *attr, char *buf)
1140 {
1141         struct thermal_instance *instance;
1142
1143         instance = container_of(attr, struct thermal_instance, weight_attr);
1144
1145         return sprintf(buf, "%d\n", instance->weight);
1146 }
1147
1148 static ssize_t
1149 thermal_cooling_device_weight_store(struct device *dev,
1150                                     struct device_attribute *attr,
1151                                     const char *buf, size_t count)
1152 {
1153         struct thermal_instance *instance;
1154         int ret, weight;
1155
1156         ret = kstrtoint(buf, 0, &weight);
1157         if (ret)
1158                 return ret;
1159
1160         instance = container_of(attr, struct thermal_instance, weight_attr);
1161         instance->weight = weight;
1162
1163         return count;
1164 }
1165 /* Device management */
1166
1167 /**
1168  * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1169  * @tz:         pointer to struct thermal_zone_device
1170  * @trip:       indicates which trip point the cooling devices is
1171  *              associated with in this thermal zone.
1172  * @cdev:       pointer to struct thermal_cooling_device
1173  * @upper:      the Maximum cooling state for this trip point.
1174  *              THERMAL_NO_LIMIT means no upper limit,
1175  *              and the cooling device can be in max_state.
1176  * @lower:      the Minimum cooling state can be used for this trip point.
1177  *              THERMAL_NO_LIMIT means no lower limit,
1178  *              and the cooling device can be in cooling state 0.
1179  * @weight:     The weight of the cooling device to be bound to the
1180  *              thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1181  *              default value
1182  *
1183  * This interface function bind a thermal cooling device to the certain trip
1184  * point of a thermal zone device.
1185  * This function is usually called in the thermal zone device .bind callback.
1186  *
1187  * Return: 0 on success, the proper error value otherwise.
1188  */
1189 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1190                                      int trip,
1191                                      struct thermal_cooling_device *cdev,
1192                                      unsigned long upper, unsigned long lower,
1193                                      unsigned int weight)
1194 {
1195         struct thermal_instance *dev;
1196         struct thermal_instance *pos;
1197         struct thermal_zone_device *pos1;
1198         struct thermal_cooling_device *pos2;
1199         unsigned long max_state;
1200         int result, ret;
1201
1202         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1203                 return -EINVAL;
1204
1205         list_for_each_entry(pos1, &thermal_tz_list, node) {
1206                 if (pos1 == tz)
1207                         break;
1208         }
1209         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1210                 if (pos2 == cdev)
1211                         break;
1212         }
1213
1214         if (tz != pos1 || cdev != pos2)
1215                 return -EINVAL;
1216
1217         ret = cdev->ops->get_max_state(cdev, &max_state);
1218         if (ret)
1219                 return ret;
1220
1221         /* lower default 0, upper default max_state */
1222         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1223         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1224
1225         if (lower > upper || upper > max_state)
1226                 return -EINVAL;
1227
1228         dev =
1229             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1230         if (!dev)
1231                 return -ENOMEM;
1232         dev->tz = tz;
1233         dev->cdev = cdev;
1234         dev->trip = trip;
1235         dev->upper = upper;
1236         dev->lower = lower;
1237         dev->target = THERMAL_NO_TARGET;
1238         dev->weight = weight;
1239
1240         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1241         if (result)
1242                 goto free_mem;
1243
1244         sprintf(dev->name, "cdev%d", dev->id);
1245         result =
1246             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1247         if (result)
1248                 goto release_idr;
1249
1250         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1251         sysfs_attr_init(&dev->attr.attr);
1252         dev->attr.attr.name = dev->attr_name;
1253         dev->attr.attr.mode = 0444;
1254         dev->attr.show = thermal_cooling_device_trip_point_show;
1255         result = device_create_file(&tz->device, &dev->attr);
1256         if (result)
1257                 goto remove_symbol_link;
1258
1259         sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1260         sysfs_attr_init(&dev->weight_attr.attr);
1261         dev->weight_attr.attr.name = dev->weight_attr_name;
1262         dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1263         dev->weight_attr.show = thermal_cooling_device_weight_show;
1264         dev->weight_attr.store = thermal_cooling_device_weight_store;
1265         result = device_create_file(&tz->device, &dev->weight_attr);
1266         if (result)
1267                 goto remove_trip_file;
1268
1269         mutex_lock(&tz->lock);
1270         mutex_lock(&cdev->lock);
1271         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1272             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1273                 result = -EEXIST;
1274                 break;
1275         }
1276         if (!result) {
1277                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1278                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1279         }
1280         mutex_unlock(&cdev->lock);
1281         mutex_unlock(&tz->lock);
1282
1283         if (!result)
1284                 return 0;
1285
1286         device_remove_file(&tz->device, &dev->weight_attr);
1287 remove_trip_file:
1288         device_remove_file(&tz->device, &dev->attr);
1289 remove_symbol_link:
1290         sysfs_remove_link(&tz->device.kobj, dev->name);
1291 release_idr:
1292         release_idr(&tz->idr, &tz->lock, dev->id);
1293 free_mem:
1294         kfree(dev);
1295         return result;
1296 }
1297 EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
1298
1299 /**
1300  * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1301  *                                        thermal zone.
1302  * @tz:         pointer to a struct thermal_zone_device.
1303  * @trip:       indicates which trip point the cooling devices is
1304  *              associated with in this thermal zone.
1305  * @cdev:       pointer to a struct thermal_cooling_device.
1306  *
1307  * This interface function unbind a thermal cooling device from the certain
1308  * trip point of a thermal zone device.
1309  * This function is usually called in the thermal zone device .unbind callback.
1310  *
1311  * Return: 0 on success, the proper error value otherwise.
1312  */
1313 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1314                                        int trip,
1315                                        struct thermal_cooling_device *cdev)
1316 {
1317         struct thermal_instance *pos, *next;
1318
1319         mutex_lock(&tz->lock);
1320         mutex_lock(&cdev->lock);
1321         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1322                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1323                         list_del(&pos->tz_node);
1324                         list_del(&pos->cdev_node);
1325                         mutex_unlock(&cdev->lock);
1326                         mutex_unlock(&tz->lock);
1327                         goto unbind;
1328                 }
1329         }
1330         mutex_unlock(&cdev->lock);
1331         mutex_unlock(&tz->lock);
1332
1333         return -ENODEV;
1334
1335 unbind:
1336         device_remove_file(&tz->device, &pos->attr);
1337         sysfs_remove_link(&tz->device.kobj, pos->name);
1338         release_idr(&tz->idr, &tz->lock, pos->id);
1339         kfree(pos);
1340         return 0;
1341 }
1342 EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
1343
1344 static void thermal_release(struct device *dev)
1345 {
1346         struct thermal_zone_device *tz;
1347         struct thermal_cooling_device *cdev;
1348
1349         if (!strncmp(dev_name(dev), "thermal_zone",
1350                      sizeof("thermal_zone") - 1)) {
1351                 tz = to_thermal_zone(dev);
1352                 kfree(tz);
1353         } else if(!strncmp(dev_name(dev), "cooling_device",
1354                         sizeof("cooling_device") - 1)){
1355                 cdev = to_cooling_device(dev);
1356                 kfree(cdev);
1357         }
1358 }
1359
1360 static struct class thermal_class = {
1361         .name = "thermal",
1362         .dev_release = thermal_release,
1363 };
1364
1365 /**
1366  * __thermal_cooling_device_register() - register a new thermal cooling device
1367  * @np:         a pointer to a device tree node.
1368  * @type:       the thermal cooling device type.
1369  * @devdata:    device private data.
1370  * @ops:                standard thermal cooling devices callbacks.
1371  *
1372  * This interface function adds a new thermal cooling device (fan/processor/...)
1373  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1374  * to all the thermal zone devices registered at the same time.
1375  * It also gives the opportunity to link the cooling device to a device tree
1376  * node, so that it can be bound to a thermal zone created out of device tree.
1377  *
1378  * Return: a pointer to the created struct thermal_cooling_device or an
1379  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1380  */
1381 static struct thermal_cooling_device *
1382 __thermal_cooling_device_register(struct device_node *np,
1383                                   char *type, void *devdata,
1384                                   const struct thermal_cooling_device_ops *ops)
1385 {
1386         struct thermal_cooling_device *cdev;
1387         int result;
1388
1389         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1390                 return ERR_PTR(-EINVAL);
1391
1392         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1393             !ops->set_cur_state)
1394                 return ERR_PTR(-EINVAL);
1395
1396         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1397         if (!cdev)
1398                 return ERR_PTR(-ENOMEM);
1399
1400         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1401         if (result) {
1402                 kfree(cdev);
1403                 return ERR_PTR(result);
1404         }
1405
1406         strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
1407         mutex_init(&cdev->lock);
1408         INIT_LIST_HEAD(&cdev->thermal_instances);
1409         cdev->np = np;
1410         cdev->ops = ops;
1411         cdev->updated = false;
1412         cdev->device.class = &thermal_class;
1413         cdev->device.groups = cooling_device_attr_groups;
1414         cdev->devdata = devdata;
1415         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1416         result = device_register(&cdev->device);
1417         if (result) {
1418                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1419                 kfree(cdev);
1420                 return ERR_PTR(result);
1421         }
1422
1423         /* Add 'this' new cdev to the global cdev list */
1424         mutex_lock(&thermal_list_lock);
1425         list_add(&cdev->node, &thermal_cdev_list);
1426         mutex_unlock(&thermal_list_lock);
1427
1428         /* Update binding information for 'this' new cdev */
1429         bind_cdev(cdev);
1430
1431         return cdev;
1432 }
1433
1434 /**
1435  * thermal_cooling_device_register() - register a new thermal cooling device
1436  * @type:       the thermal cooling device type.
1437  * @devdata:    device private data.
1438  * @ops:                standard thermal cooling devices callbacks.
1439  *
1440  * This interface function adds a new thermal cooling device (fan/processor/...)
1441  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1442  * to all the thermal zone devices registered at the same time.
1443  *
1444  * Return: a pointer to the created struct thermal_cooling_device or an
1445  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1446  */
1447 struct thermal_cooling_device *
1448 thermal_cooling_device_register(char *type, void *devdata,
1449                                 const struct thermal_cooling_device_ops *ops)
1450 {
1451         return __thermal_cooling_device_register(NULL, type, devdata, ops);
1452 }
1453 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
1454
1455 /**
1456  * thermal_of_cooling_device_register() - register an OF thermal cooling device
1457  * @np:         a pointer to a device tree node.
1458  * @type:       the thermal cooling device type.
1459  * @devdata:    device private data.
1460  * @ops:                standard thermal cooling devices callbacks.
1461  *
1462  * This function will register a cooling device with device tree node reference.
1463  * This interface function adds a new thermal cooling device (fan/processor/...)
1464  * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1465  * to all the thermal zone devices registered at the same time.
1466  *
1467  * Return: a pointer to the created struct thermal_cooling_device or an
1468  * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1469  */
1470 struct thermal_cooling_device *
1471 thermal_of_cooling_device_register(struct device_node *np,
1472                                    char *type, void *devdata,
1473                                    const struct thermal_cooling_device_ops *ops)
1474 {
1475         return __thermal_cooling_device_register(np, type, devdata, ops);
1476 }
1477 EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1478
1479 /**
1480  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1481  * @cdev:       the thermal cooling device to remove.
1482  *
1483  * thermal_cooling_device_unregister() must be called when the device is no
1484  * longer needed.
1485  */
1486 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1487 {
1488         int i;
1489         const struct thermal_zone_params *tzp;
1490         struct thermal_zone_device *tz;
1491         struct thermal_cooling_device *pos = NULL;
1492
1493         if (!cdev)
1494                 return;
1495
1496         mutex_lock(&thermal_list_lock);
1497         list_for_each_entry(pos, &thermal_cdev_list, node)
1498             if (pos == cdev)
1499                 break;
1500         if (pos != cdev) {
1501                 /* thermal cooling device not found */
1502                 mutex_unlock(&thermal_list_lock);
1503                 return;
1504         }
1505         list_del(&cdev->node);
1506
1507         /* Unbind all thermal zones associated with 'this' cdev */
1508         list_for_each_entry(tz, &thermal_tz_list, node) {
1509                 if (tz->ops->unbind) {
1510                         tz->ops->unbind(tz, cdev);
1511                         continue;
1512                 }
1513
1514                 if (!tz->tzp || !tz->tzp->tbp)
1515                         continue;
1516
1517                 tzp = tz->tzp;
1518                 for (i = 0; i < tzp->num_tbps; i++) {
1519                         if (tzp->tbp[i].cdev == cdev) {
1520                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1521                                 tzp->tbp[i].cdev = NULL;
1522                         }
1523                 }
1524         }
1525
1526         mutex_unlock(&thermal_list_lock);
1527
1528         if (cdev->type[0])
1529                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1530         device_remove_file(&cdev->device, &dev_attr_max_state);
1531         device_remove_file(&cdev->device, &dev_attr_cur_state);
1532
1533         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1534         device_unregister(&cdev->device);
1535         return;
1536 }
1537 EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
1538
1539 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1540 {
1541         struct thermal_instance *instance;
1542         unsigned long target = 0;
1543
1544         /* cooling device is updated*/
1545         if (cdev->updated)
1546                 return;
1547
1548         mutex_lock(&cdev->lock);
1549         /* Make sure cdev enters the deepest cooling state */
1550         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1551                 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1552                                 instance->tz->id, instance->target);
1553                 if (instance->target == THERMAL_NO_TARGET)
1554                         continue;
1555                 if (instance->target > target)
1556                         target = instance->target;
1557         }
1558         mutex_unlock(&cdev->lock);
1559         cdev->ops->set_cur_state(cdev, target);
1560         cdev->updated = true;
1561         trace_cdev_update(cdev, target);
1562         dev_dbg(&cdev->device, "set to state %lu\n", target);
1563 }
1564 EXPORT_SYMBOL(thermal_cdev_update);
1565
1566 /**
1567  * thermal_notify_framework - Sensor drivers use this API to notify framework
1568  * @tz:         thermal zone device
1569  * @trip:       indicates which trip point has been crossed
1570  *
1571  * This function handles the trip events from sensor drivers. It starts
1572  * throttling the cooling devices according to the policy configured.
1573  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1574  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1575  * The throttling policy is based on the configured platform data; if no
1576  * platform data is provided, this uses the step_wise throttling policy.
1577  */
1578 void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
1579 {
1580         handle_thermal_trip(tz, trip);
1581 }
1582 EXPORT_SYMBOL_GPL(thermal_notify_framework);
1583
1584 /**
1585  * create_trip_attrs() - create attributes for trip points
1586  * @tz:         the thermal zone device
1587  * @mask:       Writeable trip point bitmap.
1588  *
1589  * helper function to instantiate sysfs entries for every trip
1590  * point and its properties of a struct thermal_zone_device.
1591  *
1592  * Return: 0 on success, the proper error value otherwise.
1593  */
1594 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1595 {
1596         int indx;
1597         int size = sizeof(struct thermal_attr) * tz->trips;
1598
1599         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1600         if (!tz->trip_type_attrs)
1601                 return -ENOMEM;
1602
1603         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1604         if (!tz->trip_temp_attrs) {
1605                 kfree(tz->trip_type_attrs);
1606                 return -ENOMEM;
1607         }
1608
1609         if (tz->ops->get_trip_hyst) {
1610                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1611                 if (!tz->trip_hyst_attrs) {
1612                         kfree(tz->trip_type_attrs);
1613                         kfree(tz->trip_temp_attrs);
1614                         return -ENOMEM;
1615                 }
1616         }
1617
1618
1619         for (indx = 0; indx < tz->trips; indx++) {
1620                 /* create trip type attribute */
1621                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1622                          "trip_point_%d_type", indx);
1623
1624                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1625                 tz->trip_type_attrs[indx].attr.attr.name =
1626                                                 tz->trip_type_attrs[indx].name;
1627                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1628                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1629
1630                 device_create_file(&tz->device,
1631                                    &tz->trip_type_attrs[indx].attr);
1632
1633                 /* create trip temp attribute */
1634                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1635                          "trip_point_%d_temp", indx);
1636
1637                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1638                 tz->trip_temp_attrs[indx].attr.attr.name =
1639                                                 tz->trip_temp_attrs[indx].name;
1640                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1641                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1642                 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1643                     mask & (1 << indx)) {
1644                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1645                         tz->trip_temp_attrs[indx].attr.store =
1646                                                         trip_point_temp_store;
1647                 }
1648
1649                 device_create_file(&tz->device,
1650                                    &tz->trip_temp_attrs[indx].attr);
1651
1652                 /* create Optional trip hyst attribute */
1653                 if (!tz->ops->get_trip_hyst)
1654                         continue;
1655                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1656                          "trip_point_%d_hyst", indx);
1657
1658                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1659                 tz->trip_hyst_attrs[indx].attr.attr.name =
1660                                         tz->trip_hyst_attrs[indx].name;
1661                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1662                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1663                 if (tz->ops->set_trip_hyst) {
1664                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1665                         tz->trip_hyst_attrs[indx].attr.store =
1666                                         trip_point_hyst_store;
1667                 }
1668
1669                 device_create_file(&tz->device,
1670                                    &tz->trip_hyst_attrs[indx].attr);
1671         }
1672         return 0;
1673 }
1674
1675 static void remove_trip_attrs(struct thermal_zone_device *tz)
1676 {
1677         int indx;
1678
1679         for (indx = 0; indx < tz->trips; indx++) {
1680                 device_remove_file(&tz->device,
1681                                    &tz->trip_type_attrs[indx].attr);
1682                 device_remove_file(&tz->device,
1683                                    &tz->trip_temp_attrs[indx].attr);
1684                 if (tz->ops->get_trip_hyst)
1685                         device_remove_file(&tz->device,
1686                                   &tz->trip_hyst_attrs[indx].attr);
1687         }
1688         kfree(tz->trip_type_attrs);
1689         kfree(tz->trip_temp_attrs);
1690         kfree(tz->trip_hyst_attrs);
1691 }
1692
1693 /**
1694  * thermal_zone_device_register() - register a new thermal zone device
1695  * @type:       the thermal zone device type
1696  * @trips:      the number of trip points the thermal zone support
1697  * @mask:       a bit string indicating the writeablility of trip points
1698  * @devdata:    private device data
1699  * @ops:        standard thermal zone device callbacks
1700  * @tzp:        thermal zone platform parameters
1701  * @passive_delay: number of milliseconds to wait between polls when
1702  *                 performing passive cooling
1703  * @polling_delay: number of milliseconds to wait between polls when checking
1704  *                 whether trip points have been crossed (0 for interrupt
1705  *                 driven systems)
1706  *
1707  * This interface function adds a new thermal zone device (sensor) to
1708  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1709  * thermal cooling devices registered at the same time.
1710  * thermal_zone_device_unregister() must be called when the device is no
1711  * longer needed. The passive cooling depends on the .get_trend() return value.
1712  *
1713  * Return: a pointer to the created struct thermal_zone_device or an
1714  * in case of error, an ERR_PTR. Caller must check return value with
1715  * IS_ERR*() helpers.
1716  */
1717 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1718         int trips, int mask, void *devdata,
1719         struct thermal_zone_device_ops *ops,
1720         struct thermal_zone_params *tzp,
1721         int passive_delay, int polling_delay)
1722 {
1723         struct thermal_zone_device *tz;
1724         enum thermal_trip_type trip_type;
1725         int result;
1726         int count;
1727         int passive = 0;
1728         struct thermal_governor *governor;
1729
1730         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1731                 return ERR_PTR(-EINVAL);
1732
1733         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1734                 return ERR_PTR(-EINVAL);
1735
1736         if (!ops)
1737                 return ERR_PTR(-EINVAL);
1738
1739         if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
1740                 return ERR_PTR(-EINVAL);
1741
1742         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1743         if (!tz)
1744                 return ERR_PTR(-ENOMEM);
1745
1746         INIT_LIST_HEAD(&tz->thermal_instances);
1747         idr_init(&tz->idr);
1748         mutex_init(&tz->lock);
1749         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1750         if (result) {
1751                 kfree(tz);
1752                 return ERR_PTR(result);
1753         }
1754
1755         strlcpy(tz->type, type ? : "", sizeof(tz->type));
1756         tz->ops = ops;
1757         tz->tzp = tzp;
1758         tz->device.class = &thermal_class;
1759         tz->devdata = devdata;
1760         tz->trips = trips;
1761         tz->passive_delay = passive_delay;
1762         tz->polling_delay = polling_delay;
1763
1764         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1765         result = device_register(&tz->device);
1766         if (result) {
1767                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1768                 kfree(tz);
1769                 return ERR_PTR(result);
1770         }
1771
1772         /* sys I/F */
1773         if (type) {
1774                 result = device_create_file(&tz->device, &dev_attr_type);
1775                 if (result)
1776                         goto unregister;
1777         }
1778
1779         result = device_create_file(&tz->device, &dev_attr_temp);
1780         if (result)
1781                 goto unregister;
1782
1783         if (ops->get_mode) {
1784                 result = device_create_file(&tz->device, &dev_attr_mode);
1785                 if (result)
1786                         goto unregister;
1787         }
1788
1789         result = create_trip_attrs(tz, mask);
1790         if (result)
1791                 goto unregister;
1792
1793         for (count = 0; count < trips; count++) {
1794                 tz->ops->get_trip_type(tz, count, &trip_type);
1795                 if (trip_type == THERMAL_TRIP_PASSIVE)
1796                         passive = 1;
1797         }
1798
1799         if (!passive) {
1800                 result = device_create_file(&tz->device, &dev_attr_passive);
1801                 if (result)
1802                         goto unregister;
1803         }
1804
1805 #ifdef CONFIG_THERMAL_EMULATION
1806         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1807         if (result)
1808                 goto unregister;
1809 #endif
1810         /* Create policy attribute */
1811         result = device_create_file(&tz->device, &dev_attr_policy);
1812         if (result)
1813                 goto unregister;
1814
1815         /* Add thermal zone params */
1816         result = create_tzp_attrs(&tz->device);
1817         if (result)
1818                 goto unregister;
1819
1820         /* Update 'this' zone's governor information */
1821         mutex_lock(&thermal_governor_lock);
1822
1823         if (tz->tzp)
1824                 governor = __find_governor(tz->tzp->governor_name);
1825         else
1826                 governor = def_governor;
1827
1828         result = thermal_set_governor(tz, governor);
1829         if (result) {
1830                 mutex_unlock(&thermal_governor_lock);
1831                 goto unregister;
1832         }
1833
1834         mutex_unlock(&thermal_governor_lock);
1835
1836         if (!tz->tzp || !tz->tzp->no_hwmon) {
1837                 result = thermal_add_hwmon_sysfs(tz);
1838                 if (result)
1839                         goto unregister;
1840         }
1841
1842         mutex_lock(&thermal_list_lock);
1843         list_add_tail(&tz->node, &thermal_tz_list);
1844         mutex_unlock(&thermal_list_lock);
1845
1846         /* Bind cooling devices for this zone */
1847         bind_tz(tz);
1848
1849         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1850
1851         if (!tz->ops->get_temp)
1852                 thermal_zone_device_set_polling(tz, 0);
1853
1854         thermal_zone_device_update(tz);
1855
1856         return tz;
1857
1858 unregister:
1859         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1860         device_unregister(&tz->device);
1861         return ERR_PTR(result);
1862 }
1863 EXPORT_SYMBOL_GPL(thermal_zone_device_register);
1864
1865 /**
1866  * thermal_device_unregister - removes the registered thermal zone device
1867  * @tz: the thermal zone device to remove
1868  */
1869 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1870 {
1871         int i;
1872         const struct thermal_zone_params *tzp;
1873         struct thermal_cooling_device *cdev;
1874         struct thermal_zone_device *pos = NULL;
1875
1876         if (!tz)
1877                 return;
1878
1879         tzp = tz->tzp;
1880
1881         mutex_lock(&thermal_list_lock);
1882         list_for_each_entry(pos, &thermal_tz_list, node)
1883             if (pos == tz)
1884                 break;
1885         if (pos != tz) {
1886                 /* thermal zone device not found */
1887                 mutex_unlock(&thermal_list_lock);
1888                 return;
1889         }
1890         list_del(&tz->node);
1891
1892         /* Unbind all cdevs associated with 'this' thermal zone */
1893         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1894                 if (tz->ops->unbind) {
1895                         tz->ops->unbind(tz, cdev);
1896                         continue;
1897                 }
1898
1899                 if (!tzp || !tzp->tbp)
1900                         break;
1901
1902                 for (i = 0; i < tzp->num_tbps; i++) {
1903                         if (tzp->tbp[i].cdev == cdev) {
1904                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1905                                 tzp->tbp[i].cdev = NULL;
1906                         }
1907                 }
1908         }
1909
1910         mutex_unlock(&thermal_list_lock);
1911
1912         thermal_zone_device_set_polling(tz, 0);
1913
1914         if (tz->type[0])
1915                 device_remove_file(&tz->device, &dev_attr_type);
1916         device_remove_file(&tz->device, &dev_attr_temp);
1917         if (tz->ops->get_mode)
1918                 device_remove_file(&tz->device, &dev_attr_mode);
1919         device_remove_file(&tz->device, &dev_attr_policy);
1920         remove_trip_attrs(tz);
1921         thermal_set_governor(tz, NULL);
1922
1923         thermal_remove_hwmon_sysfs(tz);
1924         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1925         idr_destroy(&tz->idr);
1926         mutex_destroy(&tz->lock);
1927         device_unregister(&tz->device);
1928         return;
1929 }
1930 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
1931
1932 /**
1933  * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1934  * @name: thermal zone name to fetch the temperature
1935  *
1936  * When only one zone is found with the passed name, returns a reference to it.
1937  *
1938  * Return: On success returns a reference to an unique thermal zone with
1939  * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1940  * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1941  */
1942 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1943 {
1944         struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1945         unsigned int found = 0;
1946
1947         if (!name)
1948                 goto exit;
1949
1950         mutex_lock(&thermal_list_lock);
1951         list_for_each_entry(pos, &thermal_tz_list, node)
1952                 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
1953                         found++;
1954                         ref = pos;
1955                 }
1956         mutex_unlock(&thermal_list_lock);
1957
1958         /* nothing has been found, thus an error code for it */
1959         if (found == 0)
1960                 ref = ERR_PTR(-ENODEV);
1961         else if (found > 1)
1962         /* Success only when an unique zone is found */
1963                 ref = ERR_PTR(-EEXIST);
1964
1965 exit:
1966         return ref;
1967 }
1968 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1969
1970 #ifdef CONFIG_NET
1971 static const struct genl_multicast_group thermal_event_mcgrps[] = {
1972         { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1973 };
1974
1975 static struct genl_family thermal_event_genl_family = {
1976         .id = GENL_ID_GENERATE,
1977         .name = THERMAL_GENL_FAMILY_NAME,
1978         .version = THERMAL_GENL_VERSION,
1979         .maxattr = THERMAL_GENL_ATTR_MAX,
1980         .mcgrps = thermal_event_mcgrps,
1981         .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
1982 };
1983
1984 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1985                                         enum events event)
1986 {
1987         struct sk_buff *skb;
1988         struct nlattr *attr;
1989         struct thermal_genl_event *thermal_event;
1990         void *msg_header;
1991         int size;
1992         int result;
1993         static unsigned int thermal_event_seqnum;
1994
1995         if (!tz)
1996                 return -EINVAL;
1997
1998         /* allocate memory */
1999         size = nla_total_size(sizeof(struct thermal_genl_event)) +
2000                nla_total_size(0);
2001
2002         skb = genlmsg_new(size, GFP_ATOMIC);
2003         if (!skb)
2004                 return -ENOMEM;
2005
2006         /* add the genetlink message header */
2007         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2008                                  &thermal_event_genl_family, 0,
2009                                  THERMAL_GENL_CMD_EVENT);
2010         if (!msg_header) {
2011                 nlmsg_free(skb);
2012                 return -ENOMEM;
2013         }
2014
2015         /* fill the data */
2016         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2017                            sizeof(struct thermal_genl_event));
2018
2019         if (!attr) {
2020                 nlmsg_free(skb);
2021                 return -EINVAL;
2022         }
2023
2024         thermal_event = nla_data(attr);
2025         if (!thermal_event) {
2026                 nlmsg_free(skb);
2027                 return -EINVAL;
2028         }
2029
2030         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2031
2032         thermal_event->orig = tz->id;
2033         thermal_event->event = event;
2034
2035         /* send multicast genetlink message */
2036         genlmsg_end(skb, msg_header);
2037
2038         result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
2039                                    0, GFP_ATOMIC);
2040         if (result)
2041                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
2042
2043         return result;
2044 }
2045 EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
2046
2047 static int genetlink_init(void)
2048 {
2049         return genl_register_family(&thermal_event_genl_family);
2050 }
2051
2052 static void genetlink_exit(void)
2053 {
2054         genl_unregister_family(&thermal_event_genl_family);
2055 }
2056 #else /* !CONFIG_NET */
2057 static inline int genetlink_init(void) { return 0; }
2058 static inline void genetlink_exit(void) {}
2059 #endif /* !CONFIG_NET */
2060
2061 static int __init thermal_register_governors(void)
2062 {
2063         int result;
2064
2065         result = thermal_gov_step_wise_register();
2066         if (result)
2067                 return result;
2068
2069         result = thermal_gov_fair_share_register();
2070         if (result)
2071                 return result;
2072
2073         result = thermal_gov_bang_bang_register();
2074         if (result)
2075                 return result;
2076
2077         result = thermal_gov_user_space_register();
2078         if (result)
2079                 return result;
2080
2081         return thermal_gov_power_allocator_register();
2082 }
2083
2084 static void thermal_unregister_governors(void)
2085 {
2086         thermal_gov_step_wise_unregister();
2087         thermal_gov_fair_share_unregister();
2088         thermal_gov_bang_bang_unregister();
2089         thermal_gov_user_space_unregister();
2090         thermal_gov_power_allocator_unregister();
2091 }
2092
2093 static int __init thermal_init(void)
2094 {
2095         int result;
2096
2097         result = thermal_register_governors();
2098         if (result)
2099                 goto error;
2100
2101         result = class_register(&thermal_class);
2102         if (result)
2103                 goto unregister_governors;
2104
2105         result = genetlink_init();
2106         if (result)
2107                 goto unregister_class;
2108
2109         result = of_parse_thermal_zones();
2110         if (result)
2111                 goto exit_netlink;
2112
2113         return 0;
2114
2115 exit_netlink:
2116         genetlink_exit();
2117 unregister_class:
2118         class_unregister(&thermal_class);
2119 unregister_governors:
2120         thermal_unregister_governors();
2121 error:
2122         idr_destroy(&thermal_tz_idr);
2123         idr_destroy(&thermal_cdev_idr);
2124         mutex_destroy(&thermal_idr_lock);
2125         mutex_destroy(&thermal_list_lock);
2126         mutex_destroy(&thermal_governor_lock);
2127         return result;
2128 }
2129
2130 static void __exit thermal_exit(void)
2131 {
2132         of_thermal_destroy_zones();
2133         genetlink_exit();
2134         class_unregister(&thermal_class);
2135         thermal_unregister_governors();
2136         idr_destroy(&thermal_tz_idr);
2137         idr_destroy(&thermal_cdev_idr);
2138         mutex_destroy(&thermal_idr_lock);
2139         mutex_destroy(&thermal_list_lock);
2140         mutex_destroy(&thermal_governor_lock);
2141 }
2142
2143 fs_initcall(thermal_init);
2144 module_exit(thermal_exit);