drivers/misc/enclosure.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Enclosure Services
   4  *
   5  * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
   6  *
   7 **-----------------------------------------------------------------------------
   8 **
   9 **
  10 **-----------------------------------------------------------------------------
  11 */
  12 #include <linux/device.h>
  13 #include <linux/enclosure.h>
  14 #include <linux/err.h>
  15 #include <linux/list.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/mutex.h>
  19 #include <linux/slab.h>
  20
  21 static LIST_HEAD(container_list);
  22 static DEFINE_MUTEX(container_list_lock);
  23 static struct class enclosure_class;
  24
  25 /**
  26  * enclosure_find - find an enclosure given a parent device
  27  * @dev:        the parent to match against
  28  * @start:      Optional enclosure device to start from (NULL if none)
  29  *
  30  * Looks through the list of registered enclosures to find all those
  31  * with @dev as a parent.  Returns NULL if no enclosure is
  32  * found. @start can be used as a starting point to obtain multiple
  33  * enclosures per parent (should begin with NULL and then be set to
  34  * each returned enclosure device). Obtains a reference to the
  35  * enclosure class device which must be released with device_put().
  36  * If @start is not NULL, a reference must be taken on it which is
  37  * released before returning (this allows a loop through all
  38  * enclosures to exit with only the reference on the enclosure of
  39  * interest held).  Note that the @dev may correspond to the actual
  40  * device housing the enclosure, in which case no iteration via @start
  41  * is required.
  42  */
  43 struct enclosure_device *enclosure_find(struct device *dev,
  44                                         struct enclosure_device *start)
  45 {
  46         struct enclosure_device *edev;
  47
  48         mutex_lock(&container_list_lock);
  49         edev = list_prepare_entry(start, &container_list, node);
  50         if (start)
  51                 put_device(&start->edev);
  52
  53         list_for_each_entry_continue(edev, &container_list, node) {
  54                 struct device *parent = edev->edev.parent;
  55                 /* parent might not be immediate, so iterate up to
  56                  * the root of the tree if necessary */
  57                 while (parent) {
  58                         if (parent == dev) {
  59                                 get_device(&edev->edev);
  60                                 mutex_unlock(&container_list_lock);
  61                                 return edev;
  62                         }
  63                         parent = parent->parent;
  64                 }
  65         }
  66         mutex_unlock(&container_list_lock);
  67
  68         return NULL;
  69 }
  70 EXPORT_SYMBOL_GPL(enclosure_find);
  71
  72 /**
  73  * enclosure_for_each_device - calls a function for each enclosure
  74  * @fn:         the function to call
  75  * @data:       the data to pass to each call
  76  *
  77  * Loops over all the enclosures calling the function.
  78  *
  79  * Note, this function uses a mutex which will be held across calls to
  80  * @fn, so it must have non atomic context, and @fn may (although it
  81  * should not) sleep or otherwise cause the mutex to be held for
  82  * indefinite periods
  83  */
  84 int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *),
  85                               void *data)
  86 {
  87         int error = 0;
  88         struct enclosure_device *edev;
  89
  90         mutex_lock(&container_list_lock);
  91         list_for_each_entry(edev, &container_list, node) {
  92                 error = fn(edev, data);
  93                 if (error)
  94                         break;
  95         }
  96         mutex_unlock(&container_list_lock);
  97
  98         return error;
  99 }
 100 EXPORT_SYMBOL_GPL(enclosure_for_each_device);
 101
 102 /**
 103  * enclosure_register - register device as an enclosure
 104  *
 105  * @dev:        device containing the enclosure
 106  * @name:       chosen device name
 107  * @components: number of components in the enclosure
 108  * @cb:         platform call-backs
 109  *
 110  * This sets up the device for being an enclosure.  Note that @dev does
 111  * not have to be a dedicated enclosure device.  It may be some other type
 112  * of device that additionally responds to enclosure services
 113  */
 114 struct enclosure_device *
 115 enclosure_register(struct device *dev, const char *name, int components,
 116                    struct enclosure_component_callbacks *cb)
 117 {
 118         struct enclosure_device *edev =
 119                 kzalloc(struct_size(edev, component, components), GFP_KERNEL);
 120         int err, i;
 121
 122         BUG_ON(!cb);
 123
 124         if (!edev)
 125                 return ERR_PTR(-ENOMEM);
 126
 127         edev->components = components;
 128
 129         edev->edev.class = &enclosure_class;
 130         edev->edev.parent = get_device(dev);
 131         edev->cb = cb;
 132         dev_set_name(&edev->edev, "%s", name);
 133         err = device_register(&edev->edev);
 134         if (err)
 135                 goto err;
 136
 137         for (i = 0; i < components; i++) {
 138                 edev->component[i].number = -1;
 139                 edev->component[i].slot = -1;
 140                 edev->component[i].power_status = -1;
 141         }
 142
 143         mutex_lock(&container_list_lock);
 144         list_add_tail(&edev->node, &container_list);
 145         mutex_unlock(&container_list_lock);
 146
 147         return edev;
 148
 149  err:
 150         put_device(edev->edev.parent);
 151         kfree(edev);
 152         return ERR_PTR(err);
 153 }
 154 EXPORT_SYMBOL_GPL(enclosure_register);
 155
 156 static struct enclosure_component_callbacks enclosure_null_callbacks;
 157
 158 /**
 159  * enclosure_unregister - remove an enclosure
 160  *
 161  * @edev:       the registered enclosure to remove;
 162  */
 163 void enclosure_unregister(struct enclosure_device *edev)
 164 {
 165         int i;
 166
 167         mutex_lock(&container_list_lock);
 168         list_del(&edev->node);
 169         mutex_unlock(&container_list_lock);
 170
 171         for (i = 0; i < edev->components; i++)
 172                 if (edev->component[i].number != -1)
 173                         device_unregister(&edev->component[i].cdev);
 174
 175         /* prevent any callbacks into service user */
 176         edev->cb = &enclosure_null_callbacks;
 177         device_unregister(&edev->edev);
 178 }
 179 EXPORT_SYMBOL_GPL(enclosure_unregister);
 180
 181 #define ENCLOSURE_NAME_SIZE     64
 182 #define COMPONENT_NAME_SIZE     64
 183
 184 static void enclosure_link_name(struct enclosure_component *cdev, char *name)
 185 {
 186         strcpy(name, "enclosure_device:");
 187         strcat(name, dev_name(&cdev->cdev));
 188 }
 189
 190 static void enclosure_remove_links(struct enclosure_component *cdev)
 191 {
 192         char name[ENCLOSURE_NAME_SIZE];
 193
 194         enclosure_link_name(cdev, name);
 195
 196         /*
 197          * In odd circumstances, like multipath devices, something else may
 198          * already have removed the links, so check for this condition first.
 199          */
 200         if (cdev->dev->kobj.sd)
 201                 sysfs_remove_link(&cdev->dev->kobj, name);
 202
 203         if (cdev->cdev.kobj.sd)
 204                 sysfs_remove_link(&cdev->cdev.kobj, "device");
 205 }
 206
 207 static int enclosure_add_links(struct enclosure_component *cdev)
 208 {
 209         int error;
 210         char name[ENCLOSURE_NAME_SIZE];
 211
 212         error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device");
 213         if (error)
 214                 return error;
 215
 216         enclosure_link_name(cdev, name);
 217         error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name);
 218         if (error)
 219                 sysfs_remove_link(&cdev->cdev.kobj, "device");
 220
 221         return error;
 222 }
 223
 224 static void enclosure_release(struct device *cdev)
 225 {
 226         struct enclosure_device *edev = to_enclosure_device(cdev);
 227
 228         put_device(cdev->parent);
 229         kfree(edev);
 230 }
 231
 232 static void enclosure_component_release(struct device *dev)
 233 {
 234         struct enclosure_component *cdev = to_enclosure_component(dev);
 235
 236         if (cdev->dev) {
 237                 enclosure_remove_links(cdev);
 238                 put_device(cdev->dev);
 239         }
 240         put_device(dev->parent);
 241 }
 242
 243 static struct enclosure_component *
 244 enclosure_component_find_by_name(struct enclosure_device *edev,
 245                                 const char *name)
 246 {
 247         int i;
 248         const char *cname;
 249         struct enclosure_component *ecomp;
 250
 251         if (!edev || !name || !name[0])
 252                 return NULL;
 253
 254         for (i = 0; i < edev->components; i++) {
 255                 ecomp = &edev->component[i];
 256                 cname = dev_name(&ecomp->cdev);
 257                 if (ecomp->number != -1 &&
 258                     cname && cname[0] &&
 259                     !strcmp(cname, name))
 260                         return ecomp;
 261         }
 262
 263         return NULL;
 264 }
 265
 266 static const struct attribute_group *enclosure_component_groups[];
 267
 268 /**
 269  * enclosure_component_alloc - prepare a new enclosure component
 270  * @edev:       the enclosure to add the component
 271  * @number:     the device number
 272  * @type:       the type of component being added
 273  * @name:       an optional name to appear in sysfs (leave NULL if none)
 274  *
 275  * The name is optional for enclosures that give their components a unique
 276  * name.  If not, leave the field NULL and a name will be assigned.
 277  *
 278  * Returns a pointer to the enclosure component or an error.
 279  */
 280 struct enclosure_component *
 281 enclosure_component_alloc(struct enclosure_device *edev,
 282                           unsigned int number,
 283                           enum enclosure_component_type type,
 284                           const char *name)
 285 {
 286         struct enclosure_component *ecomp;
 287         struct device *cdev;
 288         int i;
 289         char newname[COMPONENT_NAME_SIZE];
 290
 291         if (number >= edev->components)
 292                 return ERR_PTR(-EINVAL);
 293
 294         ecomp = &edev->component[number];
 295
 296         if (ecomp->number != -1)
 297                 return ERR_PTR(-EINVAL);
 298
 299         ecomp->type = type;
 300         ecomp->number = number;
 301         cdev = &ecomp->cdev;
 302         cdev->parent = get_device(&edev->edev);
 303
 304         if (name && name[0]) {
 305                 /* Some hardware (e.g. enclosure in RX300 S6) has components
 306                  * with non unique names. Registering duplicates in sysfs
 307                  * will lead to warnings during bootup. So make the names
 308                  * unique by appending consecutive numbers -1, -2, ... */
 309                 i = 1;
 310                 snprintf(newname, COMPONENT_NAME_SIZE,
 311                          "%s", name);
 312                 while (enclosure_component_find_by_name(edev, newname))
 313                         snprintf(newname, COMPONENT_NAME_SIZE,
 314                                  "%s-%i", name, i++);
 315                 dev_set_name(cdev, "%s", newname);
 316         } else
 317                 dev_set_name(cdev, "%u", number);
 318
 319         cdev->release = enclosure_component_release;
 320         cdev->groups = enclosure_component_groups;
 321
 322         return ecomp;
 323 }
 324 EXPORT_SYMBOL_GPL(enclosure_component_alloc);
 325
 326 /**
 327  * enclosure_component_register - publishes an initialized enclosure component
 328  * @ecomp:      component to add
 329  *
 330  * Returns 0 on successful registration, releases the component otherwise
 331  */
 332 int enclosure_component_register(struct enclosure_component *ecomp)
 333 {
 334         struct device *cdev;
 335         int err;
 336
 337         cdev = &ecomp->cdev;
 338         err = device_register(cdev);
 339         if (err) {
 340                 ecomp->number = -1;
 341                 put_device(cdev);
 342                 return err;
 343         }
 344
 345         return 0;
 346 }
 347 EXPORT_SYMBOL_GPL(enclosure_component_register);
 348
 349 /**
 350  * enclosure_add_device - add a device as being part of an enclosure
 351  * @edev:       the enclosure device being added to.
 352  * @component:  the number of the component
 353  * @dev:        the device being added
 354  *
 355  * Declares a real device to reside in slot (or identifier) @num of an
 356  * enclosure.  This will cause the relevant sysfs links to appear.
 357  * This function may also be used to change a device associated with
 358  * an enclosure without having to call enclosure_remove_device() in
 359  * between.
 360  *
 361  * Returns zero on success or an error.
 362  */
 363 int enclosure_add_device(struct enclosure_device *edev, int component,
 364                          struct device *dev)
 365 {
 366         struct enclosure_component *cdev;
 367         int err;
 368
 369         if (!edev || component >= edev->components)
 370                 return -EINVAL;
 371
 372         cdev = &edev->component[component];
 373
 374         if (cdev->dev == dev)
 375                 return -EEXIST;
 376
 377         if (cdev->dev) {
 378                 enclosure_remove_links(cdev);
 379                 put_device(cdev->dev);
 380         }
 381         cdev->dev = get_device(dev);
 382         err = enclosure_add_links(cdev);
 383         if (err) {
 384                 put_device(cdev->dev);
 385                 cdev->dev = NULL;
 386         }
 387         return err;
 388 }
 389 EXPORT_SYMBOL_GPL(enclosure_add_device);
 390
 391 /**
 392  * enclosure_remove_device - remove a device from an enclosure
 393  * @edev:       the enclosure device
 394  * @dev:        device to remove/put
 395  *
 396  * Returns zero on success or an error.
 397  *
 398  */
 399 int enclosure_remove_device(struct enclosure_device *edev, struct device *dev)
 400 {
 401         struct enclosure_component *cdev;
 402         int i;
 403
 404         if (!edev || !dev)
 405                 return -EINVAL;
 406
 407         for (i = 0; i < edev->components; i++) {
 408                 cdev = &edev->component[i];
 409                 if (cdev->dev == dev) {
 410                         enclosure_remove_links(cdev);
 411                         put_device(dev);
 412                         cdev->dev = NULL;
 413                         return 0;
 414                 }
 415         }
 416         return -ENODEV;
 417 }
 418 EXPORT_SYMBOL_GPL(enclosure_remove_device);
 419
 420 /*
 421  * sysfs pieces below
 422  */
 423
 424 static ssize_t components_show(struct device *cdev,
 425                                struct device_attribute *attr, char *buf)
 426 {
 427         struct enclosure_device *edev = to_enclosure_device(cdev);
 428
 429         return snprintf(buf, 40, "%d\n", edev->components);
 430 }
 431 static DEVICE_ATTR_RO(components);
 432
 433 static ssize_t id_show(struct device *cdev,
 434                                  struct device_attribute *attr,
 435                                  char *buf)
 436 {
 437         struct enclosure_device *edev = to_enclosure_device(cdev);
 438
 439         if (edev->cb->show_id)
 440                 return edev->cb->show_id(edev, buf);
 441         return -EINVAL;
 442 }
 443 static DEVICE_ATTR_RO(id);
 444
 445 static struct attribute *enclosure_class_attrs[] = {
 446         &dev_attr_components.attr,
 447         &dev_attr_id.attr,
 448         NULL,
 449 };
 450 ATTRIBUTE_GROUPS(enclosure_class);
 451
 452 static struct class enclosure_class = {
 453         .name                   = "enclosure",
 454         .owner                  = THIS_MODULE,
 455         .dev_release            = enclosure_release,
 456         .dev_groups             = enclosure_class_groups,
 457 };
 458
 459 static const char *const enclosure_status[] = {
 460         [ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported",
 461         [ENCLOSURE_STATUS_OK] = "OK",
 462         [ENCLOSURE_STATUS_CRITICAL] = "critical",
 463         [ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical",
 464         [ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable",
 465         [ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed",
 466         [ENCLOSURE_STATUS_UNKNOWN] = "unknown",
 467         [ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable",
 468         [ENCLOSURE_STATUS_MAX] = NULL,
 469 };
 470
 471 static const char *const enclosure_type[] = {
 472         [ENCLOSURE_COMPONENT_DEVICE] = "device",
 473         [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",
 474 };
 475
 476 static ssize_t get_component_fault(struct device *cdev,
 477                                    struct device_attribute *attr, char *buf)
 478 {
 479         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 480         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 481
 482         if (edev->cb->get_fault)
 483                 edev->cb->get_fault(edev, ecomp);
 484         return snprintf(buf, 40, "%d\n", ecomp->fault);
 485 }
 486
 487 static ssize_t set_component_fault(struct device *cdev,
 488                                    struct device_attribute *attr,
 489                                    const char *buf, size_t count)
 490 {
 491         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 492         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 493         int val = simple_strtoul(buf, NULL, 0);
 494
 495         if (edev->cb->set_fault)
 496                 edev->cb->set_fault(edev, ecomp, val);
 497         return count;
 498 }
 499
 500 static ssize_t get_component_status(struct device *cdev,
 501                                     struct device_attribute *attr,char *buf)
 502 {
 503         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 504         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 505
 506         if (edev->cb->get_status)
 507                 edev->cb->get_status(edev, ecomp);
 508         return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]);
 509 }
 510
 511 static ssize_t set_component_status(struct device *cdev,
 512                                     struct device_attribute *attr,
 513                                     const char *buf, size_t count)
 514 {
 515         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 516         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 517         int i;
 518
 519         for (i = 0; enclosure_status[i]; i++) {
 520                 if (strncmp(buf, enclosure_status[i],
 521                             strlen(enclosure_status[i])) == 0 &&
 522                     (buf[strlen(enclosure_status[i])] == '\n' ||
 523                      buf[strlen(enclosure_status[i])] == '\0'))
 524                         break;
 525         }
 526
 527         if (enclosure_status[i] && edev->cb->set_status) {
 528                 edev->cb->set_status(edev, ecomp, i);
 529                 return count;
 530         } else
 531                 return -EINVAL;
 532 }
 533
 534 static ssize_t get_component_active(struct device *cdev,
 535                                     struct device_attribute *attr, char *buf)
 536 {
 537         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 538         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 539
 540         if (edev->cb->get_active)
 541                 edev->cb->get_active(edev, ecomp);
 542         return snprintf(buf, 40, "%d\n", ecomp->active);
 543 }
 544
 545 static ssize_t set_component_active(struct device *cdev,
 546                                     struct device_attribute *attr,
 547                                     const char *buf, size_t count)
 548 {
 549         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 550         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 551         int val = simple_strtoul(buf, NULL, 0);
 552
 553         if (edev->cb->set_active)
 554                 edev->cb->set_active(edev, ecomp, val);
 555         return count;
 556 }
 557
 558 static ssize_t get_component_locate(struct device *cdev,
 559                                     struct device_attribute *attr, char *buf)
 560 {
 561         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 562         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 563
 564         if (edev->cb->get_locate)
 565                 edev->cb->get_locate(edev, ecomp);
 566         return snprintf(buf, 40, "%d\n", ecomp->locate);
 567 }
 568
 569 static ssize_t set_component_locate(struct device *cdev,
 570                                     struct device_attribute *attr,
 571                                     const char *buf, size_t count)
 572 {
 573         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 574         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 575         int val = simple_strtoul(buf, NULL, 0);
 576
 577         if (edev->cb->set_locate)
 578                 edev->cb->set_locate(edev, ecomp, val);
 579         return count;
 580 }
 581
 582 static ssize_t get_component_power_status(struct device *cdev,
 583                                           struct device_attribute *attr,
 584                                           char *buf)
 585 {
 586         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 587         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 588
 589         if (edev->cb->get_power_status)
 590                 edev->cb->get_power_status(edev, ecomp);
 591
 592         /* If still uninitialized, the callback failed or does not exist. */
 593         if (ecomp->power_status == -1)
 594                 return (edev->cb->get_power_status) ? -EIO : -ENOTTY;
 595
 596         return snprintf(buf, 40, "%s\n", ecomp->power_status ? "on" : "off");
 597 }
 598
 599 static ssize_t set_component_power_status(struct device *cdev,
 600                                           struct device_attribute *attr,
 601                                           const char *buf, size_t count)
 602 {
 603         struct enclosure_device *edev = to_enclosure_device(cdev->parent);
 604         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 605         int val;
 606
 607         if (strncmp(buf, "on", 2) == 0 &&
 608             (buf[2] == '\n' || buf[2] == '\0'))
 609                 val = 1;
 610         else if (strncmp(buf, "off", 3) == 0 &&
 611             (buf[3] == '\n' || buf[3] == '\0'))
 612                 val = 0;
 613         else
 614                 return -EINVAL;
 615
 616         if (edev->cb->set_power_status)
 617                 edev->cb->set_power_status(edev, ecomp, val);
 618         return count;
 619 }
 620
 621 static ssize_t get_component_type(struct device *cdev,
 622                                   struct device_attribute *attr, char *buf)
 623 {
 624         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 625
 626         return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
 627 }
 628
 629 static ssize_t get_component_slot(struct device *cdev,
 630                                   struct device_attribute *attr, char *buf)
 631 {
 632         struct enclosure_component *ecomp = to_enclosure_component(cdev);
 633         int slot;
 634
 635         /* if the enclosure does not override then use 'number' as a stand-in */
 636         if (ecomp->slot >= 0)
 637                 slot = ecomp->slot;
 638         else
 639                 slot = ecomp->number;
 640
 641         return snprintf(buf, 40, "%d\n", slot);
 642 }
 643
 644 static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
 645                     set_component_fault);
 646 static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
 647                    set_component_status);
 648 static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
 649                    set_component_active);
 650 static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
 651                    set_component_locate);
 652 static DEVICE_ATTR(power_status, S_IRUGO | S_IWUSR, get_component_power_status,
 653                    set_component_power_status);
 654 static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
 655 static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL);
 656
 657 static struct attribute *enclosure_component_attrs[] = {
 658         &dev_attr_fault.attr,
 659         &dev_attr_status.attr,
 660         &dev_attr_active.attr,
 661         &dev_attr_locate.attr,
 662         &dev_attr_power_status.attr,
 663         &dev_attr_type.attr,
 664         &dev_attr_slot.attr,
 665         NULL
 666 };
 667 ATTRIBUTE_GROUPS(enclosure_component);
 668
 669 static int __init enclosure_init(void)
 670 {
 671         return class_register(&enclosure_class);
 672 }
 673
 674 static void __exit enclosure_exit(void)
 675 {
 676         class_unregister(&enclosure_class);
 677 }
 678
 679 module_init(enclosure_init);
 680 module_exit(enclosure_exit);
 681
 682 MODULE_AUTHOR("James Bottomley");
 683 MODULE_DESCRIPTION("Enclosure Services");
 684 MODULE_LICENSE("GPL v2");