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(struct_size(edev, component, components), GFP_KERNEL);
 129         int err, i;
 130
 131         BUG_ON(!cb);
 132
 133         if (!edev)
 134                 return ERR_PTR(-ENOMEM);
 135
 136         edev->components = components;
 137
 138         edev->edev.class = &enclosure_class;
 139         edev->edev.parent = get_device(dev);
 140         edev->cb = cb;
 141         dev_set_name(&edev->edev, "%s", name);
 142         err = device_register(&edev->edev);
 143         if (err)
 144                 goto err;
 145
 146         for (i = 0; i < components; i++) {
 147                 edev->component[i].number = -1;
 148                 edev->component[i].slot = -1;
 149                 edev->component[i].power_status = -1;
 150         }
 151
 152         mutex_lock(&container_list_lock);
 153         list_add_tail(&edev->node, &container_list);
 154         mutex_unlock(&container_list_lock);
 155
 156         return edev;
 157
 158  err:
 159         put_device(edev->edev.parent);
 160         kfree(edev);
 161         return ERR_PTR(err);
 162 }
 163 EXPORT_SYMBOL_GPL(enclosure_register);
 164
 165 static struct enclosure_component_callbacks enclosure_null_callbacks;
 166
 167 /**
 168  * enclosure_unregister - remove an enclosure
 169  *
 170  * @edev:       the registered enclosure to remove;
 171  */
 172 void enclosure_unregister(struct enclosure_device *edev)
 173 {
 174         int i;
 175
 176         mutex_lock(&container_list_lock);
 177         list_del(&edev->node);
 178         mutex_unlock(&container_list_lock);
 179
 180         for (i = 0; i < edev->components; i++)
 181                 if (edev->component[i].number != -1)
 182                         device_unregister(&edev->component[i].cdev);
 183
 184         /* prevent any callbacks into service user */
 185         edev->cb = &enclosure_null_callbacks;
 186         device_unregister(&edev->edev);
 187 }
 188 EXPORT_SYMBOL_GPL(enclosure_unregister);
 189
 190 #define ENCLOSURE_NAME_SIZE     64
 191 #define COMPONENT_NAME_SIZE     64
 192
 193 static void enclosure_link_name(struct enclosure_component *cdev, char *name)
 194 {
 195         strcpy(name, "enclosure_device:");
 196         strcat(name, dev_name(&cdev->cdev));
 197 }
 198
 199 static void enclosure_remove_links(struct enclosure_component *cdev)
 200 {
 201         char name[ENCLOSURE_NAME_SIZE];
 202
 203         enclosure_link_name(cdev, name);
 204
 205         /*
 206          * In odd circumstances, like multipath devices, something else may
 207          * already have removed the links, so check for this condition first.
 208          */
 209         if (cdev->dev->kobj.sd)
 210                 sysfs_remove_link(&cdev->dev->kobj, name);
 211
 212         if (cdev->cdev.kobj.sd)
 213                 sysfs_remove_link(&cdev->cdev.kobj, "device");
 214 }
 215
 216 static int enclosure_add_links(struct enclosure_component *cdev)
 217 {
 218         int error;
 219         char name[ENCLOSURE_NAME_SIZE];
 220
 221         error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device");
 222         if (error)
 223                 return error;
 224
 225         enclosure_link_name(cdev, name);
 226         error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name);
 227         if (error)
 228                 sysfs_remove_link(&cdev->cdev.kobj, "device");
 229
 230         return error;
 231 }
 232
 233 static void enclosure_release(struct device *cdev)
 234 {
 235         struct enclosure_device *edev = to_enclosure_device(cdev);
 236
 237         put_device(cdev->parent);
 238         kfree(edev);
 239 }
 240
 241 static void enclosure_component_release(struct device *dev)
 242 {
 243         struct enclosure_component *cdev = to_enclosure_component(dev);
 244
 245         if (cdev->dev) {
 246                 enclosure_remove_links(cdev);
 247                 put_device(cdev->dev);
 248         }
 249         put_device(dev->parent);
 250 }
 251
 252 static struct enclosure_component *
 253 enclosure_component_find_by_name(struct enclosure_device *edev,
 254                                 const char *name)
 255 {
 256         int i;
 257         const char *cname;
 258         struct enclosure_component *ecomp;
 259
 260         if (!edev || !name || !name[0])
 261                 return NULL;
 262
 263         for (i = 0; i < edev->components; i++) {
 264                 ecomp = &edev->component[i];
 265                 cname = dev_name(&ecomp->cdev);
 266                 if (ecomp->number != -1 &&
 267                     cname && cname[0] &&
 268                     !strcmp(cname, name))
 269                         return ecomp;
 270         }
 271
 272         return NULL;
 273 }
 274
 275 static const struct attribute_group *enclosure_component_groups[];
 276
 277 /**
 278  * enclosure_component_alloc - prepare a new enclosure component
 279  * @edev:       the enclosure to add the component
 280  * @num:        the device number
 281  * @type:       the type of component being added
 282  * @name:       an optional name to appear in sysfs (leave NULL if none)
 283  *
 284  * The name is optional for enclosures that give their components a unique
 285  * name.  If not, leave the field NULL and a name will be assigned.
 286  *
 287  * Returns a pointer to the enclosure component or an error.
 288  */
 289 struct enclosure_component *
 290 enclosure_component_alloc(struct enclosure_device *edev,
 291                           unsigned int number,
 292                           enum enclosure_component_type type,
 293                           const char *name)
 294 {
 295         struct enclosure_component *ecomp;
 296         struct device *cdev;
 297         int i;
 298         char newname[COMPONENT_NAME_SIZE];
 299
 300         if (number >= edev->components)
 301                 return ERR_PTR(-EINVAL);
 302
 303         ecomp = &edev->component[number];
 304
 305         if (ecomp->number != -1)
 306                 return ERR_PTR(-EINVAL);
 307
 308         ecomp->type = type;
 309         ecomp->number = number;
 310         cdev = &ecomp->cdev;
 311         cdev->parent = get_device(&edev->edev);
 312
 313         if (name && name[0]) {
 314                 /* Some hardware (e.g. enclosure in RX300 S6) has components
 315                  * with non unique names. Registering duplicates in sysfs
 316                  * will lead to warnings during bootup. So make the names
 317                  * unique by appending consecutive numbers -1, -2, ... */
 318                 i = 1;
 319                 snprintf(newname, COMPONENT_NAME_SIZE,
 320                          "%s", name);
 321                 while (enclosure_component_find_by_name(edev, newname))
 322                         snprintf(newname, COMPONENT_NAME_SIZE,
 323                                  "%s-%i", name, i++);
 324                 dev_set_name(cdev, "%s", newname);
 325         } else
 326                 dev_set_name(cdev, "%u", number);
 327
 328         cdev->release = enclosure_component_release;
 329         cdev->groups = enclosure_component_groups;
 330
 331         return ecomp;
 332 }
 333 EXPORT_SYMBOL_GPL(enclosure_component_alloc);
 334
 335 /**
 336  * enclosure_component_register - publishes an initialized enclosure component
 337  * @ecomp:      component to add
 338  *
 339  * Returns 0 on successful registration, releases the component otherwise
 340  */
 341 int enclosure_component_register(struct enclosure_component *ecomp)
 342 {
 343         struct device *cdev;
 344         int err;
 345
 346         cdev = &ecomp->cdev;
 347         err = device_register(cdev);
 348         if (err) {
 349                 ecomp->number = -1;
 350                 put_device(cdev);
 351                 return err;
 352         }
 353
 354         return 0;
 355 }
 356 EXPORT_SYMBOL_GPL(enclosure_component_register);
 357
 358 /**
 359  * enclosure_add_device - add a device as being part of an enclosure
 360  * @edev:       the enclosure device being added to.
 361  * @num:        the number of the component
 362  * @dev:        the device being added
 363  *
 364  * Declares a real device to reside in slot (or identifier) @num of an
 365  * enclosure.  This will cause the relevant sysfs links to appear.
 366  * This function may also be used to change a device associated with
 367  * an enclosure without having to call enclosure_remove_device() in
 368  * between.
 369  *
 370  * Returns zero on success or an error.
 371  */
 372 int enclosure_add_device(struct enclosure_device *edev, int component,
 373                          struct device *dev)
 374 {
 375         struct enclosure_component *cdev;
 376         int err;
 377
 378         if (!edev || component >= edev->components)
 379                 return -EINVAL;
 380
 381         cdev = &edev->component[component];
 382
 383         if (cdev->dev == dev)
 384                 return -EEXIST;
 385
 386         if (cdev->dev) {
 387                 enclosure_remove_links(cdev);
 388                 put_device(cdev->dev);
 389         }
 390         cdev->dev = get_device(dev);
 391         err = enclosure_add_links(cdev);
 392         if (err) {
 393                 put_device(cdev->dev);
 394                 cdev->dev = NULL;
 395         }
 396         return err;
 397 }
 398 EXPORT_SYMBOL_GPL(enclosure_add_device);
 399
 400 /**
 401  * enclosure_remove_device - remove a device from an enclosure
 402  * @edev:       the enclosure device
 403  * @num:        the number of the component to remove
 404  *
 405  * Returns zero on success or an error.
 406  *
 407  */
 408 int enclosure_remove_device(struct enclosure_device *edev, struct device *dev)
 409 {
 410         struct enclosure_component *cdev;
 411         int i;
 412
 413         if (!edev || !dev)
 414                 return -EINVAL;
 415
 416         for (i = 0; i < edev->components; i++) {
 417                 cdev = &edev->component[i];
 418                 if (cdev->dev == dev) {
 419                         enclosure_remove_links(cdev);
 420                         device_del(&cdev->cdev);
 421                         put_device(dev);
 422                         cdev->dev = NULL;
 423                         return device_add(&cdev->cdev);
 424                 }
 425         }
 426         return -ENODEV;
 427 }
 428 EXPORT_SYMBOL_GPL(enclosure_remove_device);
 429
 430 /*
 431  * sysfs pieces below
 432  */
 433
 434 static ssize_t components_show(struct device *cdev,
 435                                struct device_attribute *attr, char *buf)
 436 {
 437         struct enclosure_device *edev = to_enclosure_device(cdev);
 438
 439         return snprintf(buf, 40, "%d\n", edev->components);
 440 }
 441 static DEVICE_ATTR_RO(components);
 442
 443 static ssize_t id_show(struct device *cdev,
 444                                  struct device_attribute *attr,
 445                                  char *buf)
 446 {
 447         struct enclosure_device *edev = to_enclosure_device(cdev);
 448
 449         if (edev->cb->show_id)
 450                 return edev->cb->show_id(edev, buf);
 451         return -EINVAL;
 452 }
 453 static DEVICE_ATTR_RO(id);
 454
 455 static struct attribute *enclosure_class_attrs[] = {
 456         &dev_attr_components.attr,
 457         &dev_attr_id.attr,
 458         NULL,
 459 };
 460 ATTRIBUTE_GROUPS(enclosure_class);
 461
 462 static struct class enclosure_class = {
 463         .name                   = "enclosure",
 464         .owner                  = THIS_MODULE,
 465         .dev_release            = enclosure_release,
 466         .dev_groups             = enclosure_class_groups,
 467 };
 468
 469 static const char *const enclosure_status[] = {
 470         [ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported",
 471         [ENCLOSURE_STATUS_OK] = "OK",
 472         [ENCLOSURE_STATUS_CRITICAL] = "critical",
 473         [ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical",
 474         [ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable",
 475         [ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed",
 476         [ENCLOSURE_STATUS_UNKNOWN] = "unknown",
 477         [ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable",
 478         [ENCLOSURE_STATUS_MAX] = NULL,
 479 };
 480
 481 static const char *const enclosure_type[] = {
 482         [ENCLOSURE_COMPONENT_DEVICE] = "device",
 483         [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",
 484 };
 485
 486 static ssize_t get_component_fault(struct device *cdev,
 487                                    struct device_attribute *attr, char *buf)
 488 {
 489         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 490         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 491
 492         if (edev->cb->get_fault)
 493                 edev->cb->get_fault(edev, ecomp);
 494         return snprintf(buf, 40, "%d\n", ecomp->fault);
 495 }
 496
 497 static ssize_t set_component_fault(struct device *cdev,
 498                                    struct device_attribute *attr,
 499                                    const char *buf, size_t count)
 500 {
 501         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 502         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 503         int val = simple_strtoul(buf, NULL, 0);
 504
 505         if (edev->cb->set_fault)
 506                 edev->cb->set_fault(edev, ecomp, val);
 507         return count;
 508 }
 509
 510 static ssize_t get_component_status(struct device *cdev,
 511                                     struct device_attribute *attr,char *buf)
 512 {
 513         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 514         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 515
 516         if (edev->cb->get_status)
 517                 edev->cb->get_status(edev, ecomp);
 518         return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]);
 519 }
 520
 521 static ssize_t set_component_status(struct device *cdev,
 522                                     struct device_attribute *attr,
 523                                     const char *buf, size_t count)
 524 {
 525         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 526         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 527         int i;
 528
 529         for (i = 0; enclosure_status[i]; i++) {
 530                 if (strncmp(buf, enclosure_status[i],
 531                             strlen(enclosure_status[i])) == 0 &&
 532                     (buf[strlen(enclosure_status[i])] == '\n' ||
 533                      buf[strlen(enclosure_status[i])] == '\0'))
 534                         break;
 535         }
 536
 537         if (enclosure_status[i] && edev->cb->set_status) {
 538                 edev->cb->set_status(edev, ecomp, i);
 539                 return count;
 540         } else
 541                 return -EINVAL;
 542 }
 543
 544 static ssize_t get_component_active(struct device *cdev,
 545                                     struct device_attribute *attr, char *buf)
 546 {
 547         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 548         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 549
 550         if (edev->cb->get_active)
 551                 edev->cb->get_active(edev, ecomp);
 552         return snprintf(buf, 40, "%d\n", ecomp->active);
 553 }
 554
 555 static ssize_t set_component_active(struct device *cdev,
 556                                     struct device_attribute *attr,
 557                                     const char *buf, size_t count)
 558 {
 559         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 560         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 561         int val = simple_strtoul(buf, NULL, 0);
 562
 563         if (edev->cb->set_active)
 564                 edev->cb->set_active(edev, ecomp, val);
 565         return count;
 566 }
 567
 568 static ssize_t get_component_locate(struct device *cdev,
 569                                     struct device_attribute *attr, char *buf)
 570 {
 571         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 572         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 573
 574         if (edev->cb->get_locate)
 575                 edev->cb->get_locate(edev, ecomp);
 576         return snprintf(buf, 40, "%d\n", ecomp->locate);
 577 }
 578
 579 static ssize_t set_component_locate(struct device *cdev,
 580                                     struct device_attribute *attr,
 581                                     const char *buf, size_t count)
 582 {
 583         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 584         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 585         int val = simple_strtoul(buf, NULL, 0);
 586
 587         if (edev->cb->set_locate)
 588                 edev->cb->set_locate(edev, ecomp, val);
 589         return count;
 590 }
 591
 592 static ssize_t get_component_power_status(struct device *cdev,
 593                                           struct device_attribute *attr,
 594                                           char *buf)
 595 {
 596         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 597         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 598
 599         if (edev->cb->get_power_status)
 600                 edev->cb->get_power_status(edev, ecomp);
 601
 602         /* If still uninitialized, the callback failed or does not exist. */
 603         if (ecomp->power_status == -1)
 604                 return (edev->cb->get_power_status) ? -EIO : -ENOTTY;
 605
 606         return snprintf(buf, 40, "%s\n", ecomp->power_status ? "on" : "off");
 607 }
 608
 609 static ssize_t set_component_power_status(struct device *cdev,
 610                                           struct device_attribute *attr,
 611                                           const char *buf, size_t count)
 612 {
 613         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 614         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 615         int val;
 616
 617         if (strncmp(buf, "on", 2) == 0 &&
 618             (buf[2] == '\n' || buf[2] == '\0'))
 619                 val = 1;
 620         else if (strncmp(buf, "off", 3) == 0 &&
 621             (buf[3] == '\n' || buf[3] == '\0'))
 622                 val = 0;
 623         else
 624                 return -EINVAL;
 625
 626         if (edev->cb->set_power_status)
 627                 edev->cb->set_power_status(edev, ecomp, val);
 628         return count;
 629 }
 630
 631 static ssize_t get_component_type(struct device *cdev,
 632                                   struct device_attribute *attr, char *buf)
 633 {
 634         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 635
 636         return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
 637 }
 638
 639 static ssize_t get_component_slot(struct device *cdev,
 640                                   struct device_attribute *attr, char *buf)
 641 {
 642         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 643         int slot;
 644
 645         /* if the enclosure does not override then use 'number' as a stand-in */
 646         if (ecomp->slot >= 0)
 647                 slot = ecomp->slot;
 648         else
 649                 slot = ecomp->number;
 650
 651         return snprintf(buf, 40, "%d\n", slot);
 652 }
 653
 654 static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
 655                     set_component_fault);
 656 static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
 657                    set_component_status);
 658 static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
 659                    set_component_active);
 660 static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
 661                    set_component_locate);
 662 static DEVICE_ATTR(power_status, S_IRUGO | S_IWUSR, get_component_power_status,
 663                    set_component_power_status);
 664 static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
 665 static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL);
 666
 667 static struct attribute *enclosure_component_attrs[] = {
 668         &dev_attr_fault.attr,
 669         &dev_attr_status.attr,
 670         &dev_attr_active.attr,
 671         &dev_attr_locate.attr,
 672         &dev_attr_power_status.attr,
 673         &dev_attr_type.attr,
 674         &dev_attr_slot.attr,
 675         NULL
 676 };
 677 ATTRIBUTE_GROUPS(enclosure_component);
 678
 679 static int __init enclosure_init(void)
 680 {
 681         return class_register(&enclosure_class);
 682 }
 683
 684 static void __exit enclosure_exit(void)
 685 {
 686         class_unregister(&enclosure_class);
 687 }
 688
 689 module_init(enclosure_init);
 690 module_exit(enclosure_exit);
 691
 692 MODULE_AUTHOR("James Bottomley");
 693 MODULE_DESCRIPTION("Enclosure Services");
 694 MODULE_LICENSE("GPL v2");