drivers/misc/enclosure.c

   1 /*
   2  * Enclosure Services
   3  *
   4  * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
   5  *
   6 **-----------------------------------------------------------------------------
   7 **
   8 **  This program is free software; you can redistribute it and/or
   9 **  modify it under the terms of the GNU General Public License
  10 **  version 2 as published by the Free Software Foundation.
  11 **
  12 **  This program is distributed in the hope that it will be useful,
  13 **  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 **  GNU General Public License for more details.
  16 **
  17 **  You should have received a copy of the GNU General Public License
  18 **  along with this program; if not, write to the Free Software
  19 **  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 **
  21 **-----------------------------------------------------------------------------
  22 */
  23 #include <linux/device.h>
  24 #include <linux/enclosure.h>
  25 #include <linux/err.h>
  26 #include <linux/list.h>
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/slab.h>
  31
  32 static LIST_HEAD(container_list);
  33 static DEFINE_MUTEX(container_list_lock);
  34 static struct class enclosure_class;
  35
  36 /**
  37  * enclosure_find - find an enclosure given a parent device
  38  * @dev:        the parent to match against
  39  * @start:      Optional enclosure device to start from (NULL if none)
  40  *
  41  * Looks through the list of registered enclosures to find all those
  42  * with @dev as a parent.  Returns NULL if no enclosure is
  43  * found. @start can be used as a starting point to obtain multiple
  44  * enclosures per parent (should begin with NULL and then be set to
  45  * each returned enclosure device). Obtains a reference to the
  46  * enclosure class device which must be released with device_put().
  47  * If @start is not NULL, a reference must be taken on it which is
  48  * released before returning (this allows a loop through all
  49  * enclosures to exit with only the reference on the enclosure of
  50  * interest held).  Note that the @dev may correspond to the actual
  51  * device housing the enclosure, in which case no iteration via @start
  52  * is required.
  53  */
  54 struct enclosure_device *enclosure_find(struct device *dev,
  55                                         struct enclosure_device *start)
  56 {
  57         struct enclosure_device *edev;
  58
  59         mutex_lock(&container_list_lock);
  60         edev = list_prepare_entry(start, &container_list, node);
  61         if (start)
  62                 put_device(&start->edev);
  63
  64         list_for_each_entry_continue(edev, &container_list, node) {
  65                 struct device *parent = edev->edev.parent;
  66                 /* parent might not be immediate, so iterate up to
  67                  * the root of the tree if necessary */
  68                 while (parent) {
  69                         if (parent == dev) {
  70                                 get_device(&edev->edev);
  71                                 mutex_unlock(&container_list_lock);
  72                                 return edev;
  73                         }
  74                         parent = parent->parent;
  75                 }
  76         }
  77         mutex_unlock(&container_list_lock);
  78
  79         return NULL;
  80 }
  81 EXPORT_SYMBOL_GPL(enclosure_find);
  82
  83 /**
  84  * enclosure_for_each_device - calls a function for each enclosure
  85  * @fn:         the function to call
  86  * @data:       the data to pass to each call
  87  *
  88  * Loops over all the enclosures calling the function.
  89  *
  90  * Note, this function uses a mutex which will be held across calls to
  91  * @fn, so it must have non atomic context, and @fn may (although it
  92  * should not) sleep or otherwise cause the mutex to be held for
  93  * indefinite periods
  94  */
  95 int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *),
  96                               void *data)
  97 {
  98         int error = 0;
  99         struct enclosure_device *edev;
 100
 101         mutex_lock(&container_list_lock);
 102         list_for_each_entry(edev, &container_list, node) {
 103                 error = fn(edev, data);
 104                 if (error)
 105                         break;
 106         }
 107         mutex_unlock(&container_list_lock);
 108
 109         return error;
 110 }
 111 EXPORT_SYMBOL_GPL(enclosure_for_each_device);
 112
 113 /**
 114  * enclosure_register - register device as an enclosure
 115  *
 116  * @dev:        device containing the enclosure
 117  * @components: number of components in the enclosure
 118  *
 119  * This sets up the device for being an enclosure.  Note that @dev does
 120  * not have to be a dedicated enclosure device.  It may be some other type
 121  * of device that additionally responds to enclosure services
 122  */
 123 struct enclosure_device *
 124 enclosure_register(struct device *dev, const char *name, int components,
 125                    struct enclosure_component_callbacks *cb)
 126 {
 127         struct enclosure_device *edev =
 128                 kzalloc(sizeof(struct enclosure_device) +
 129                         sizeof(struct enclosure_component)*components,
 130                         GFP_KERNEL);
 131         int err, i;
 132
 133         BUG_ON(!cb);
 134
 135         if (!edev)
 136                 return ERR_PTR(-ENOMEM);
 137
 138         edev->components = components;
 139
 140         edev->edev.class = &enclosure_class;
 141         edev->edev.parent = get_device(dev);
 142         edev->cb = cb;
 143         dev_set_name(&edev->edev, "%s", name);
 144         err = device_register(&edev->edev);
 145         if (err)
 146                 goto err;
 147
 148         for (i = 0; i < components; i++) {
 149                 edev->component[i].number = -1;
 150                 edev->component[i].slot = -1;
 151                 edev->component[i].power_status = 1;
 152         }
 153
 154         mutex_lock(&container_list_lock);
 155         list_add_tail(&edev->node, &container_list);
 156         mutex_unlock(&container_list_lock);
 157
 158         return edev;
 159
 160  err:
 161         put_device(edev->edev.parent);
 162         kfree(edev);
 163         return ERR_PTR(err);
 164 }
 165 EXPORT_SYMBOL_GPL(enclosure_register);
 166
 167 static struct enclosure_component_callbacks enclosure_null_callbacks;
 168
 169 /**
 170  * enclosure_unregister - remove an enclosure
 171  *
 172  * @edev:       the registered enclosure to remove;
 173  */
 174 void enclosure_unregister(struct enclosure_device *edev)
 175 {
 176         int i;
 177
 178         mutex_lock(&container_list_lock);
 179         list_del(&edev->node);
 180         mutex_unlock(&container_list_lock);
 181
 182         for (i = 0; i < edev->components; i++)
 183                 if (edev->component[i].number != -1)
 184                         device_unregister(&edev->component[i].cdev);
 185
 186         /* prevent any callbacks into service user */
 187         edev->cb = &enclosure_null_callbacks;
 188         device_unregister(&edev->edev);
 189 }
 190 EXPORT_SYMBOL_GPL(enclosure_unregister);
 191
 192 #define ENCLOSURE_NAME_SIZE     64
 193 #define COMPONENT_NAME_SIZE     64
 194
 195 static void enclosure_link_name(struct enclosure_component *cdev, char *name)
 196 {
 197         strcpy(name, "enclosure_device:");
 198         strcat(name, dev_name(&cdev->cdev));
 199 }
 200
 201 static void enclosure_remove_links(struct enclosure_component *cdev)
 202 {
 203         char name[ENCLOSURE_NAME_SIZE];
 204
 205         enclosure_link_name(cdev, name);
 206
 207         /*
 208          * In odd circumstances, like multipath devices, something else may
 209          * already have removed the links, so check for this condition first.
 210          */
 211         if (cdev->dev->kobj.sd)
 212                 sysfs_remove_link(&cdev->dev->kobj, name);
 213
 214         if (cdev->cdev.kobj.sd)
 215                 sysfs_remove_link(&cdev->cdev.kobj, "device");
 216 }
 217
 218 static int enclosure_add_links(struct enclosure_component *cdev)
 219 {
 220         int error;
 221         char name[ENCLOSURE_NAME_SIZE];
 222
 223         error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device");
 224         if (error)
 225                 return error;
 226
 227         enclosure_link_name(cdev, name);
 228         error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name);
 229         if (error)
 230                 sysfs_remove_link(&cdev->cdev.kobj, "device");
 231
 232         return error;
 233 }
 234
 235 static void enclosure_release(struct device *cdev)
 236 {
 237         struct enclosure_device *edev = to_enclosure_device(cdev);
 238
 239         put_device(cdev->parent);
 240         kfree(edev);
 241 }
 242
 243 static void enclosure_component_release(struct device *dev)
 244 {
 245         struct enclosure_component *cdev = to_enclosure_component(dev);
 246
 247         if (cdev->dev) {
 248                 enclosure_remove_links(cdev);
 249                 put_device(cdev->dev);
 250         }
 251         put_device(dev->parent);
 252 }
 253
 254 static struct enclosure_component *
 255 enclosure_component_find_by_name(struct enclosure_device *edev,
 256                                 const char *name)
 257 {
 258         int i;
 259         const char *cname;
 260         struct enclosure_component *ecomp;
 261
 262         if (!edev || !name || !name[0])
 263                 return NULL;
 264
 265         for (i = 0; i < edev->components; i++) {
 266                 ecomp = &edev->component[i];
 267                 cname = dev_name(&ecomp->cdev);
 268                 if (ecomp->number != -1 &&
 269                     cname && cname[0] &&
 270                     !strcmp(cname, name))
 271                         return ecomp;
 272         }
 273
 274         return NULL;
 275 }
 276
 277 static const struct attribute_group *enclosure_component_groups[];
 278
 279 /**
 280  * enclosure_component_alloc - prepare a new enclosure component
 281  * @edev:       the enclosure to add the component
 282  * @num:        the device number
 283  * @type:       the type of component being added
 284  * @name:       an optional name to appear in sysfs (leave NULL if none)
 285  *
 286  * The name is optional for enclosures that give their components a unique
 287  * name.  If not, leave the field NULL and a name will be assigned.
 288  *
 289  * Returns a pointer to the enclosure component or an error.
 290  */
 291 struct enclosure_component *
 292 enclosure_component_alloc(struct enclosure_device *edev,
 293                           unsigned int number,
 294                           enum enclosure_component_type type,
 295                           const char *name)
 296 {
 297         struct enclosure_component *ecomp;
 298         struct device *cdev;
 299         int i;
 300         char newname[COMPONENT_NAME_SIZE];
 301
 302         if (number >= edev->components)
 303                 return ERR_PTR(-EINVAL);
 304
 305         ecomp = &edev->component[number];
 306
 307         if (ecomp->number != -1)
 308                 return ERR_PTR(-EINVAL);
 309
 310         ecomp->type = type;
 311         ecomp->number = number;
 312         cdev = &ecomp->cdev;
 313         cdev->parent = get_device(&edev->edev);
 314
 315         if (name && name[0]) {
 316                 /* Some hardware (e.g. enclosure in RX300 S6) has components
 317                  * with non unique names. Registering duplicates in sysfs
 318                  * will lead to warnings during bootup. So make the names
 319                  * unique by appending consecutive numbers -1, -2, ... */
 320                 i = 1;
 321                 snprintf(newname, COMPONENT_NAME_SIZE,
 322                          "%s", name);
 323                 while (enclosure_component_find_by_name(edev, newname))
 324                         snprintf(newname, COMPONENT_NAME_SIZE,
 325                                  "%s-%i", name, i++);
 326                 dev_set_name(cdev, "%s", newname);
 327         } else
 328                 dev_set_name(cdev, "%u", number);
 329
 330         cdev->release = enclosure_component_release;
 331         cdev->groups = enclosure_component_groups;
 332
 333         return ecomp;
 334 }
 335 EXPORT_SYMBOL_GPL(enclosure_component_alloc);
 336
 337 /**
 338  * enclosure_component_register - publishes an initialized enclosure component
 339  * @ecomp:      component to add
 340  *
 341  * Returns 0 on successful registration, releases the component otherwise
 342  */
 343 int enclosure_component_register(struct enclosure_component *ecomp)
 344 {
 345         struct device *cdev;
 346         int err;
 347
 348         cdev = &ecomp->cdev;
 349         err = device_register(cdev);
 350         if (err) {
 351                 ecomp->number = -1;
 352                 put_device(cdev);
 353                 return err;
 354         }
 355
 356         return 0;
 357 }
 358 EXPORT_SYMBOL_GPL(enclosure_component_register);
 359
 360 /**
 361  * enclosure_add_device - add a device as being part of an enclosure
 362  * @edev:       the enclosure device being added to.
 363  * @num:        the number of the component
 364  * @dev:        the device being added
 365  *
 366  * Declares a real device to reside in slot (or identifier) @num of an
 367  * enclosure.  This will cause the relevant sysfs links to appear.
 368  * This function may also be used to change a device associated with
 369  * an enclosure without having to call enclosure_remove_device() in
 370  * between.
 371  *
 372  * Returns zero on success or an error.
 373  */
 374 int enclosure_add_device(struct enclosure_device *edev, int component,
 375                          struct device *dev)
 376 {
 377         struct enclosure_component *cdev;
 378
 379         if (!edev || component >= edev->components)
 380                 return -EINVAL;
 381
 382         cdev = &edev->component[component];
 383
 384         if (cdev->dev == dev)
 385                 return -EEXIST;
 386
 387         if (cdev->dev)
 388                 enclosure_remove_links(cdev);
 389
 390         put_device(cdev->dev);
 391         cdev->dev = get_device(dev);
 392         return enclosure_add_links(cdev);
 393 }
 394 EXPORT_SYMBOL_GPL(enclosure_add_device);
 395
 396 /**
 397  * enclosure_remove_device - remove a device from an enclosure
 398  * @edev:       the enclosure device
 399  * @num:        the number of the component to remove
 400  *
 401  * Returns zero on success or an error.
 402  *
 403  */
 404 int enclosure_remove_device(struct enclosure_device *edev, struct device *dev)
 405 {
 406         struct enclosure_component *cdev;
 407         int i;
 408
 409         if (!edev || !dev)
 410                 return -EINVAL;
 411
 412         for (i = 0; i < edev->components; i++) {
 413                 cdev = &edev->component[i];
 414                 if (cdev->dev == dev) {
 415                         enclosure_remove_links(cdev);
 416                         device_del(&cdev->cdev);
 417                         put_device(dev);
 418                         cdev->dev = NULL;
 419                         return device_add(&cdev->cdev);
 420                 }
 421         }
 422         return -ENODEV;
 423 }
 424 EXPORT_SYMBOL_GPL(enclosure_remove_device);
 425
 426 /*
 427  * sysfs pieces below
 428  */
 429
 430 static ssize_t components_show(struct device *cdev,
 431                                struct device_attribute *attr, char *buf)
 432 {
 433         struct enclosure_device *edev = to_enclosure_device(cdev);
 434
 435         return snprintf(buf, 40, "%d\n", edev->components);
 436 }
 437 static DEVICE_ATTR_RO(components);
 438
 439 static ssize_t id_show(struct device *cdev,
 440                                  struct device_attribute *attr,
 441                                  char *buf)
 442 {
 443         struct enclosure_device *edev = to_enclosure_device(cdev);
 444
 445         if (edev->cb->show_id)
 446                 return edev->cb->show_id(edev, buf);
 447         return -EINVAL;
 448 }
 449 static DEVICE_ATTR_RO(id);
 450
 451 static struct attribute *enclosure_class_attrs[] = {
 452         &dev_attr_components.attr,
 453         &dev_attr_id.attr,
 454         NULL,
 455 };
 456 ATTRIBUTE_GROUPS(enclosure_class);
 457
 458 static struct class enclosure_class = {
 459         .name                   = "enclosure",
 460         .owner                  = THIS_MODULE,
 461         .dev_release            = enclosure_release,
 462         .dev_groups             = enclosure_class_groups,
 463 };
 464
 465 static const char *const enclosure_status [] = {
 466         [ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported",
 467         [ENCLOSURE_STATUS_OK] = "OK",
 468         [ENCLOSURE_STATUS_CRITICAL] = "critical",
 469         [ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical",
 470         [ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable",
 471         [ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed",
 472         [ENCLOSURE_STATUS_UNKNOWN] = "unknown",
 473         [ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable",
 474         [ENCLOSURE_STATUS_MAX] = NULL,
 475 };
 476
 477 static const char *const enclosure_type [] = {
 478         [ENCLOSURE_COMPONENT_DEVICE] = "device",
 479         [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",
 480 };
 481
 482 static ssize_t get_component_fault(struct device *cdev,
 483                                    struct device_attribute *attr, char *buf)
 484 {
 485         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 486         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 487
 488         if (edev->cb->get_fault)
 489                 edev->cb->get_fault(edev, ecomp);
 490         return snprintf(buf, 40, "%d\n", ecomp->fault);
 491 }
 492
 493 static ssize_t set_component_fault(struct device *cdev,
 494                                    struct device_attribute *attr,
 495                                    const char *buf, size_t count)
 496 {
 497         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 498         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 499         int val = simple_strtoul(buf, NULL, 0);
 500
 501         if (edev->cb->set_fault)
 502                 edev->cb->set_fault(edev, ecomp, val);
 503         return count;
 504 }
 505
 506 static ssize_t get_component_status(struct device *cdev,
 507                                     struct device_attribute *attr,char *buf)
 508 {
 509         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 510         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 511
 512         if (edev->cb->get_status)
 513                 edev->cb->get_status(edev, ecomp);
 514         return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]);
 515 }
 516
 517 static ssize_t set_component_status(struct device *cdev,
 518                                     struct device_attribute *attr,
 519                                     const char *buf, size_t count)
 520 {
 521         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 522         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 523         int i;
 524
 525         for (i = 0; enclosure_status[i]; i++) {
 526                 if (strncmp(buf, enclosure_status[i],
 527                             strlen(enclosure_status[i])) == 0 &&
 528                     (buf[strlen(enclosure_status[i])] == '\n' ||
 529                      buf[strlen(enclosure_status[i])] == '\0'))
 530                         break;
 531         }
 532
 533         if (enclosure_status[i] && edev->cb->set_status) {
 534                 edev->cb->set_status(edev, ecomp, i);
 535                 return count;
 536         } else
 537                 return -EINVAL;
 538 }
 539
 540 static ssize_t get_component_active(struct device *cdev,
 541                                     struct device_attribute *attr, char *buf)
 542 {
 543         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 544         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 545
 546         if (edev->cb->get_active)
 547                 edev->cb->get_active(edev, ecomp);
 548         return snprintf(buf, 40, "%d\n", ecomp->active);
 549 }
 550
 551 static ssize_t set_component_active(struct device *cdev,
 552                                     struct device_attribute *attr,
 553                                     const char *buf, size_t count)
 554 {
 555         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 556         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 557         int val = simple_strtoul(buf, NULL, 0);
 558
 559         if (edev->cb->set_active)
 560                 edev->cb->set_active(edev, ecomp, val);
 561         return count;
 562 }
 563
 564 static ssize_t get_component_locate(struct device *cdev,
 565                                     struct device_attribute *attr, char *buf)
 566 {
 567         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 568         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 569
 570         if (edev->cb->get_locate)
 571                 edev->cb->get_locate(edev, ecomp);
 572         return snprintf(buf, 40, "%d\n", ecomp->locate);
 573 }
 574
 575 static ssize_t set_component_locate(struct device *cdev,
 576                                     struct device_attribute *attr,
 577                                     const char *buf, size_t count)
 578 {
 579         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 580         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 581         int val = simple_strtoul(buf, NULL, 0);
 582
 583         if (edev->cb->set_locate)
 584                 edev->cb->set_locate(edev, ecomp, val);
 585         return count;
 586 }
 587
 588 static ssize_t get_component_power_status(struct device *cdev,
 589                                           struct device_attribute *attr,
 590                                           char *buf)
 591 {
 592         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 593         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 594
 595         if (edev->cb->get_power_status)
 596                 edev->cb->get_power_status(edev, ecomp);
 597         return snprintf(buf, 40, "%s\n", ecomp->power_status ? "on" : "off");
 598 }
 599
 600 static ssize_t set_component_power_status(struct device *cdev,
 601                                           struct device_attribute *attr,
 602                                           const char *buf, size_t count)
 603 {
 604         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 605         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 606         int val;
 607
 608         if (strncmp(buf, "on", 2) == 0 &&
 609             (buf[2] == '\n' || buf[2] == '\0'))
 610                 val = 1;
 611         else if (strncmp(buf, "off", 3) == 0 &&
 612             (buf[3] == '\n' || buf[3] == '\0'))
 613                 val = 0;
 614         else
 615                 return -EINVAL;
 616
 617         if (edev->cb->set_power_status)
 618                 edev->cb->set_power_status(edev, ecomp, val);
 619         return count;
 620 }
 621
 622 static ssize_t get_component_type(struct device *cdev,
 623                                   struct device_attribute *attr, char *buf)
 624 {
 625         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 626
 627         return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
 628 }
 629
 630 static ssize_t get_component_slot(struct device *cdev,
 631                                   struct device_attribute *attr, char *buf)
 632 {
 633         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 634         int slot;
 635
 636         /* if the enclosure does not override then use 'number' as a stand-in */
 637         if (ecomp->slot >= 0)
 638                 slot = ecomp->slot;
 639         else
 640                 slot = ecomp->number;
 641
 642         return snprintf(buf, 40, "%d\n", slot);
 643 }
 644
 645 static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
 646                     set_component_fault);
 647 static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
 648                    set_component_status);
 649 static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
 650                    set_component_active);
 651 static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
 652                    set_component_locate);
 653 static DEVICE_ATTR(power_status, S_IRUGO | S_IWUSR, get_component_power_status,
 654                    set_component_power_status);
 655 static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
 656 static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL);
 657
 658 static struct attribute *enclosure_component_attrs[] = {
 659         &dev_attr_fault.attr,
 660         &dev_attr_status.attr,
 661         &dev_attr_active.attr,
 662         &dev_attr_locate.attr,
 663         &dev_attr_power_status.attr,
 664         &dev_attr_type.attr,
 665         &dev_attr_slot.attr,
 666         NULL
 667 };
 668 ATTRIBUTE_GROUPS(enclosure_component);
 669
 670 static int __init enclosure_init(void)
 671 {
 672         int err;
 673
 674         err = class_register(&enclosure_class);
 675         if (err)
 676                 return err;
 677
 678         return 0;
 679 }
 680
 681 static void __exit enclosure_exit(void)
 682 {
 683         class_unregister(&enclosure_class);
 684 }
 685
 686 module_init(enclosure_init);
 687 module_exit(enclosure_exit);
 688
 689 MODULE_AUTHOR("James Bottomley");
 690 MODULE_DESCRIPTION("Enclosure Services");
 691 MODULE_LICENSE("GPL v2");