drivers/thermal/thermal.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 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <linux/err.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/idr.h>
  31 #include <linux/thermal.h>
  32 #include <linux/spinlock.h>
  33
  34 MODULE_AUTHOR("Zhang Rui")
  35 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  36 MODULE_LICENSE("GPL");
  37
  38 #define PREFIX "Thermal: "
  39
  40 struct thermal_cooling_device_instance {
  41         int id;
  42         char name[THERMAL_NAME_LENGTH];
  43         struct thermal_zone_device *tz;
  44         struct thermal_cooling_device *cdev;
  45         int trip;
  46         char attr_name[THERMAL_NAME_LENGTH];
  47         struct device_attribute attr;
  48         struct list_head node;
  49 };
  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 DEFINE_MUTEX(thermal_list_lock);
  58
  59 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  60 {
  61         int err;
  62
  63       again:
  64         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  65                 return -ENOMEM;
  66
  67         if (lock)
  68                 mutex_lock(lock);
  69         err = idr_get_new(idr, NULL, id);
  70         if (lock)
  71                 mutex_unlock(lock);
  72         if (unlikely(err == -EAGAIN))
  73                 goto again;
  74         else if (unlikely(err))
  75                 return err;
  76
  77         *id = *id & MAX_ID_MASK;
  78         return 0;
  79 }
  80
  81 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  82 {
  83         if (lock)
  84                 mutex_lock(lock);
  85         idr_remove(idr, id);
  86         if (lock)
  87                 mutex_unlock(lock);
  88 }
  89
  90 /* sys I/F for thermal zone */
  91
  92 #define to_thermal_zone(_dev) \
  93         container_of(_dev, struct thermal_zone_device, device)
  94
  95 static ssize_t
  96 type_show(struct device *dev, struct device_attribute *attr, char *buf)
  97 {
  98         struct thermal_zone_device *tz = to_thermal_zone(dev);
  99
 100         return sprintf(buf, "%s\n", tz->type);
 101 }
 102
 103 static ssize_t
 104 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 105 {
 106         struct thermal_zone_device *tz = to_thermal_zone(dev);
 107
 108         if (!tz->ops->get_temp)
 109                 return -EPERM;
 110
 111         return tz->ops->get_temp(tz, buf);
 112 }
 113
 114 static ssize_t
 115 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 116 {
 117         struct thermal_zone_device *tz = to_thermal_zone(dev);
 118
 119         if (!tz->ops->get_mode)
 120                 return -EPERM;
 121
 122         return tz->ops->get_mode(tz, buf);
 123 }
 124
 125 static ssize_t
 126 mode_store(struct device *dev, struct device_attribute *attr,
 127            const char *buf, size_t count)
 128 {
 129         struct thermal_zone_device *tz = to_thermal_zone(dev);
 130         int result;
 131
 132         if (!tz->ops->set_mode)
 133                 return -EPERM;
 134
 135         result = tz->ops->set_mode(tz, buf);
 136         if (result)
 137                 return result;
 138
 139         return count;
 140 }
 141
 142 static ssize_t
 143 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 144                      char *buf)
 145 {
 146         struct thermal_zone_device *tz = to_thermal_zone(dev);
 147         int trip;
 148
 149         if (!tz->ops->get_trip_type)
 150                 return -EPERM;
 151
 152         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 153                 return -EINVAL;
 154
 155         return tz->ops->get_trip_type(tz, trip, buf);
 156 }
 157
 158 static ssize_t
 159 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 160                      char *buf)
 161 {
 162         struct thermal_zone_device *tz = to_thermal_zone(dev);
 163         int trip;
 164
 165         if (!tz->ops->get_trip_temp)
 166                 return -EPERM;
 167
 168         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 169                 return -EINVAL;
 170
 171         return tz->ops->get_trip_temp(tz, trip, buf);
 172 }
 173
 174 static DEVICE_ATTR(type, 0444, type_show, NULL);
 175 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 176 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 177
 178 static struct device_attribute trip_point_attrs[] = {
 179         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 180         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 181         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 182         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 183         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 184         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 185         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 186         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 187         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 188         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 189         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 190         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 191         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 192         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 193         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 194         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 195         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 196         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 197         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 198         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 199 };
 200
 201 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 202 do {    \
 203         result = device_create_file(_dev,       \
 204                                 &trip_point_attrs[_index * 2]); \
 205         if (result)     \
 206                 break;  \
 207         result = device_create_file(_dev,       \
 208                         &trip_point_attrs[_index * 2 + 1]);     \
 209 } while (0)
 210
 211 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 212 do {    \
 213         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 214         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 215 } while (0)
 216
 217 /* sys I/F for cooling device */
 218 #define to_cooling_device(_dev) \
 219         container_of(_dev, struct thermal_cooling_device, device)
 220
 221 static ssize_t
 222 thermal_cooling_device_type_show(struct device *dev,
 223                                  struct device_attribute *attr, char *buf)
 224 {
 225         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 226
 227         return sprintf(buf, "%s\n", cdev->type);
 228 }
 229
 230 static ssize_t
 231 thermal_cooling_device_max_state_show(struct device *dev,
 232                                       struct device_attribute *attr, char *buf)
 233 {
 234         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 235
 236         return cdev->ops->get_max_state(cdev, buf);
 237 }
 238
 239 static ssize_t
 240 thermal_cooling_device_cur_state_show(struct device *dev,
 241                                       struct device_attribute *attr, char *buf)
 242 {
 243         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 244
 245         return cdev->ops->get_cur_state(cdev, buf);
 246 }
 247
 248 static ssize_t
 249 thermal_cooling_device_cur_state_store(struct device *dev,
 250                                        struct device_attribute *attr,
 251                                        const char *buf, size_t count)
 252 {
 253         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 254         int state;
 255         int result;
 256
 257         if (!sscanf(buf, "%d\n", &state))
 258                 return -EINVAL;
 259
 260         if (state < 0)
 261                 return -EINVAL;
 262
 263         result = cdev->ops->set_cur_state(cdev, state);
 264         if (result)
 265                 return result;
 266         return count;
 267 }
 268
 269 static struct device_attribute dev_attr_cdev_type =
 270 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 271 static DEVICE_ATTR(max_state, 0444,
 272                    thermal_cooling_device_max_state_show, NULL);
 273 static DEVICE_ATTR(cur_state, 0644,
 274                    thermal_cooling_device_cur_state_show,
 275                    thermal_cooling_device_cur_state_store);
 276
 277 static ssize_t
 278 thermal_cooling_device_trip_point_show(struct device *dev,
 279                                        struct device_attribute *attr, char *buf)
 280 {
 281         struct thermal_cooling_device_instance *instance;
 282
 283         instance =
 284             container_of(attr, struct thermal_cooling_device_instance, attr);
 285
 286         if (instance->trip == THERMAL_TRIPS_NONE)
 287                 return sprintf(buf, "-1\n");
 288         else
 289                 return sprintf(buf, "%d\n", instance->trip);
 290 }
 291
 292 /* Device management */
 293
 294 /**
 295  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 296  * @tz:         thermal zone device
 297  * @trip:       indicates which trip point the cooling devices is
 298  *              associated with in this thermal zone.
 299  * @cdev:       thermal cooling device
 300  *
 301  * This function is usually called in the thermal zone device .bind callback.
 302  */
 303 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 304                                      int trip,
 305                                      struct thermal_cooling_device *cdev)
 306 {
 307         struct thermal_cooling_device_instance *dev;
 308         struct thermal_cooling_device_instance *pos;
 309 <<<<<<< HEAD:drivers/thermal/thermal.c
 310 =======
 311         struct thermal_zone_device *pos1;
 312         struct thermal_cooling_device *pos2;
 313 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 314         int result;
 315
 316         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 317                 return -EINVAL;
 318
 319 <<<<<<< HEAD:drivers/thermal/thermal.c
 320         if (!tz || !cdev)
 321 =======
 322         list_for_each_entry(pos1, &thermal_tz_list, node) {
 323                 if (pos1 == tz)
 324                         break;
 325         }
 326         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 327                 if (pos2 == cdev)
 328                         break;
 329         }
 330
 331         if (tz != pos1 || cdev != pos2)
 332 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 333                 return -EINVAL;
 334
 335         dev =
 336             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 337         if (!dev)
 338                 return -ENOMEM;
 339         dev->tz = tz;
 340         dev->cdev = cdev;
 341         dev->trip = trip;
 342         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 343         if (result)
 344                 goto free_mem;
 345
 346         sprintf(dev->name, "cdev%d", dev->id);
 347         result =
 348             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 349         if (result)
 350                 goto release_idr;
 351
 352         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 353         dev->attr.attr.name = dev->attr_name;
 354         dev->attr.attr.mode = 0444;
 355         dev->attr.show = thermal_cooling_device_trip_point_show;
 356         result = device_create_file(&tz->device, &dev->attr);
 357         if (result)
 358                 goto remove_symbol_link;
 359
 360         mutex_lock(&tz->lock);
 361         list_for_each_entry(pos, &tz->cooling_devices, node)
 362             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 363                 result = -EEXIST;
 364                 break;
 365         }
 366         if (!result)
 367                 list_add_tail(&dev->node, &tz->cooling_devices);
 368         mutex_unlock(&tz->lock);
 369
 370         if (!result)
 371                 return 0;
 372
 373         device_remove_file(&tz->device, &dev->attr);
 374       remove_symbol_link:
 375         sysfs_remove_link(&tz->device.kobj, dev->name);
 376       release_idr:
 377         release_idr(&tz->idr, &tz->lock, dev->id);
 378       free_mem:
 379         kfree(dev);
 380         return result;
 381 }
 382
 383 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 384
 385 /**
 386  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 387  * @tz:         thermal zone device
 388  * @trip:       indicates which trip point the cooling devices is
 389  *              associated with in this thermal zone.
 390  * @cdev:       thermal cooling device
 391  *
 392  * This function is usually called in the thermal zone device .unbind callback.
 393  */
 394 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 395                                        int trip,
 396                                        struct thermal_cooling_device *cdev)
 397 {
 398         struct thermal_cooling_device_instance *pos, *next;
 399
 400         mutex_lock(&tz->lock);
 401         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 402                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 403                         list_del(&pos->node);
 404                         mutex_unlock(&tz->lock);
 405                         goto unbind;
 406                 }
 407         }
 408         mutex_unlock(&tz->lock);
 409
 410         return -ENODEV;
 411
 412       unbind:
 413         device_remove_file(&tz->device, &pos->attr);
 414         sysfs_remove_link(&tz->device.kobj, pos->name);
 415         release_idr(&tz->idr, &tz->lock, pos->id);
 416         kfree(pos);
 417         return 0;
 418 }
 419
 420 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 421
 422 static void thermal_release(struct device *dev)
 423 {
 424         struct thermal_zone_device *tz;
 425         struct thermal_cooling_device *cdev;
 426
 427         if (!strncmp(dev->bus_id, "thermal_zone", sizeof "thermal_zone" - 1)) {
 428                 tz = to_thermal_zone(dev);
 429                 kfree(tz);
 430         } else {
 431                 cdev = to_cooling_device(dev);
 432                 kfree(cdev);
 433         }
 434 }
 435
 436 static struct class thermal_class = {
 437         .name = "thermal",
 438         .dev_release = thermal_release,
 439 };
 440
 441 /**
 442  * thermal_cooling_device_register - register a new thermal cooling device
 443  * @type:       the thermal cooling device type.
 444  * @devdata:    device private data.
 445  * @ops:                standard thermal cooling devices callbacks.
 446  */
 447 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
 448                                                                void *devdata,
 449                                                                struct
 450                                                                thermal_cooling_device_ops
 451                                                                *ops)
 452 {
 453         struct thermal_cooling_device *cdev;
 454         struct thermal_zone_device *pos;
 455         int result;
 456
 457         if (strlen(type) >= THERMAL_NAME_LENGTH)
 458 <<<<<<< HEAD:drivers/thermal/thermal.c
 459                 return NULL;
 460 =======
 461                 return ERR_PTR(-EINVAL);
 462 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 463
 464         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 465             !ops->set_cur_state)
 466 <<<<<<< HEAD:drivers/thermal/thermal.c
 467                 return NULL;
 468 =======
 469                 return ERR_PTR(-EINVAL);
 470 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 471
 472         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 473         if (!cdev)
 474 <<<<<<< HEAD:drivers/thermal/thermal.c
 475                 return NULL;
 476 =======
 477                 return ERR_PTR(-ENOMEM);
 478 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 479
 480         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 481         if (result) {
 482                 kfree(cdev);
 483 <<<<<<< HEAD:drivers/thermal/thermal.c
 484                 return NULL;
 485 =======
 486                 return ERR_PTR(result);
 487 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 488         }
 489
 490         strcpy(cdev->type, type);
 491         cdev->ops = ops;
 492         cdev->device.class = &thermal_class;
 493         cdev->devdata = devdata;
 494         sprintf(cdev->device.bus_id, "cooling_device%d", cdev->id);
 495         result = device_register(&cdev->device);
 496         if (result) {
 497                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 498                 kfree(cdev);
 499 <<<<<<< HEAD:drivers/thermal/thermal.c
 500                 return NULL;
 501 =======
 502                 return ERR_PTR(result);
 503 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 504         }
 505
 506         /* sys I/F */
 507         if (type) {
 508                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 509                 if (result)
 510                         goto unregister;
 511         }
 512
 513         result = device_create_file(&cdev->device, &dev_attr_max_state);
 514         if (result)
 515                 goto unregister;
 516
 517         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 518         if (result)
 519                 goto unregister;
 520
 521         mutex_lock(&thermal_list_lock);
 522         list_add(&cdev->node, &thermal_cdev_list);
 523         list_for_each_entry(pos, &thermal_tz_list, node) {
 524                 if (!pos->ops->bind)
 525                         continue;
 526                 result = pos->ops->bind(pos, cdev);
 527                 if (result)
 528                         break;
 529
 530         }
 531         mutex_unlock(&thermal_list_lock);
 532
 533         if (!result)
 534                 return cdev;
 535
 536       unregister:
 537         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 538         device_unregister(&cdev->device);
 539 <<<<<<< HEAD:drivers/thermal/thermal.c
 540         return NULL;
 541 =======
 542         return ERR_PTR(result);
 543 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 544 }
 545
 546 EXPORT_SYMBOL(thermal_cooling_device_register);
 547
 548 /**
 549  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 550  * @cdev:       the thermal cooling device to remove.
 551  *
 552  * thermal_cooling_device_unregister() must be called when the device is no
 553  * longer needed.
 554  */
 555 void thermal_cooling_device_unregister(struct
 556                                        thermal_cooling_device
 557                                        *cdev)
 558 {
 559         struct thermal_zone_device *tz;
 560         struct thermal_cooling_device *pos = NULL;
 561
 562         if (!cdev)
 563                 return;
 564
 565         mutex_lock(&thermal_list_lock);
 566         list_for_each_entry(pos, &thermal_cdev_list, node)
 567             if (pos == cdev)
 568                 break;
 569         if (pos != cdev) {
 570                 /* thermal cooling device not found */
 571                 mutex_unlock(&thermal_list_lock);
 572                 return;
 573         }
 574         list_del(&cdev->node);
 575         list_for_each_entry(tz, &thermal_tz_list, node) {
 576                 if (!tz->ops->unbind)
 577                         continue;
 578                 tz->ops->unbind(tz, cdev);
 579         }
 580         mutex_unlock(&thermal_list_lock);
 581         if (cdev->type[0])
 582                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
 583         device_remove_file(&cdev->device, &dev_attr_max_state);
 584         device_remove_file(&cdev->device, &dev_attr_cur_state);
 585
 586         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 587         device_unregister(&cdev->device);
 588         return;
 589 }
 590
 591 EXPORT_SYMBOL(thermal_cooling_device_unregister);
 592
 593 /**
 594  * thermal_zone_device_register - register a new thermal zone device
 595  * @type:       the thermal zone device type
 596  * @trips:      the number of trip points the thermal zone support
 597  * @devdata:    private device data
 598  * @ops:        standard thermal zone device callbacks
 599  *
 600  * thermal_zone_device_unregister() must be called when the device is no
 601  * longer needed.
 602  */
 603 struct thermal_zone_device *thermal_zone_device_register(char *type,
 604                                                          int trips,
 605                                                          void *devdata, struct
 606                                                          thermal_zone_device_ops
 607                                                          *ops)
 608 {
 609         struct thermal_zone_device *tz;
 610         struct thermal_cooling_device *pos;
 611         int result;
 612         int count;
 613
 614         if (strlen(type) >= THERMAL_NAME_LENGTH)
 615 <<<<<<< HEAD:drivers/thermal/thermal.c
 616                 return NULL;
 617 =======
 618                 return ERR_PTR(-EINVAL);
 619 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 620
 621         if (trips > THERMAL_MAX_TRIPS || trips < 0)
 622 <<<<<<< HEAD:drivers/thermal/thermal.c
 623                 return NULL;
 624 =======
 625                 return ERR_PTR(-EINVAL);
 626 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 627
 628         if (!ops || !ops->get_temp)
 629 <<<<<<< HEAD:drivers/thermal/thermal.c
 630                 return NULL;
 631 =======
 632                 return ERR_PTR(-EINVAL);
 633 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 634
 635         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
 636         if (!tz)
 637 <<<<<<< HEAD:drivers/thermal/thermal.c
 638                 return NULL;
 639 =======
 640                 return ERR_PTR(-ENOMEM);
 641 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 642
 643         INIT_LIST_HEAD(&tz->cooling_devices);
 644         idr_init(&tz->idr);
 645         mutex_init(&tz->lock);
 646         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
 647         if (result) {
 648                 kfree(tz);
 649 <<<<<<< HEAD:drivers/thermal/thermal.c
 650                 return NULL;
 651 =======
 652                 return ERR_PTR(result);
 653 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 654         }
 655
 656         strcpy(tz->type, type);
 657         tz->ops = ops;
 658         tz->device.class = &thermal_class;
 659         tz->devdata = devdata;
 660         tz->trips = trips;
 661         sprintf(tz->device.bus_id, "thermal_zone%d", tz->id);
 662         result = device_register(&tz->device);
 663         if (result) {
 664                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 665                 kfree(tz);
 666 <<<<<<< HEAD:drivers/thermal/thermal.c
 667                 return NULL;
 668 =======
 669                 return ERR_PTR(result);
 670 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 671         }
 672
 673         /* sys I/F */
 674         if (type) {
 675                 result = device_create_file(&tz->device, &dev_attr_type);
 676                 if (result)
 677                         goto unregister;
 678         }
 679
 680         result = device_create_file(&tz->device, &dev_attr_temp);
 681         if (result)
 682                 goto unregister;
 683
 684         if (ops->get_mode) {
 685                 result = device_create_file(&tz->device, &dev_attr_mode);
 686                 if (result)
 687                         goto unregister;
 688         }
 689
 690         for (count = 0; count < trips; count++) {
 691                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
 692                 if (result)
 693                         goto unregister;
 694         }
 695
 696         mutex_lock(&thermal_list_lock);
 697         list_add_tail(&tz->node, &thermal_tz_list);
 698         if (ops->bind)
 699                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 700                 result = ops->bind(tz, pos);
 701                 if (result)
 702                         break;
 703                 }
 704         mutex_unlock(&thermal_list_lock);
 705
 706         if (!result)
 707                 return tz;
 708
 709       unregister:
 710         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 711         device_unregister(&tz->device);
 712 <<<<<<< HEAD:drivers/thermal/thermal.c
 713         return NULL;
 714 =======
 715         return ERR_PTR(result);
 716 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/thermal/thermal.c
 717 }
 718
 719 EXPORT_SYMBOL(thermal_zone_device_register);
 720
 721 /**
 722  * thermal_device_unregister - removes the registered thermal zone device
 723  * @tz: the thermal zone device to remove
 724  */
 725 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 726 {
 727         struct thermal_cooling_device *cdev;
 728         struct thermal_zone_device *pos = NULL;
 729         int count;
 730
 731         if (!tz)
 732                 return;
 733
 734         mutex_lock(&thermal_list_lock);
 735         list_for_each_entry(pos, &thermal_tz_list, node)
 736             if (pos == tz)
 737                 break;
 738         if (pos != tz) {
 739                 /* thermal zone device not found */
 740                 mutex_unlock(&thermal_list_lock);
 741                 return;
 742         }
 743         list_del(&tz->node);
 744         if (tz->ops->unbind)
 745                 list_for_each_entry(cdev, &thermal_cdev_list, node)
 746                     tz->ops->unbind(tz, cdev);
 747         mutex_unlock(&thermal_list_lock);
 748
 749         if (tz->type[0])
 750                 device_remove_file(&tz->device, &dev_attr_type);
 751         device_remove_file(&tz->device, &dev_attr_temp);
 752         if (tz->ops->get_mode)
 753                 device_remove_file(&tz->device, &dev_attr_mode);
 754
 755         for (count = 0; count < tz->trips; count++)
 756                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
 757
 758         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 759         idr_destroy(&tz->idr);
 760         mutex_destroy(&tz->lock);
 761         device_unregister(&tz->device);
 762         return;
 763 }
 764
 765 EXPORT_SYMBOL(thermal_zone_device_unregister);
 766
 767 static int __init thermal_init(void)
 768 {
 769         int result = 0;
 770
 771         result = class_register(&thermal_class);
 772         if (result) {
 773                 idr_destroy(&thermal_tz_idr);
 774                 idr_destroy(&thermal_cdev_idr);
 775                 mutex_destroy(&thermal_idr_lock);
 776                 mutex_destroy(&thermal_list_lock);
 777         }
 778         return result;
 779 }
 780
 781 static void __exit thermal_exit(void)
 782 {
 783         class_unregister(&thermal_class);
 784         idr_destroy(&thermal_tz_idr);
 785         idr_destroy(&thermal_cdev_idr);
 786         mutex_destroy(&thermal_idr_lock);
 787         mutex_destroy(&thermal_list_lock);
 788 }
 789
 790 subsys_initcall(thermal_init);
 791 module_exit(thermal_exit);