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edd.c
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1 /*
2  * linux/drivers/firmware/edd.c
3  * Copyright (C) 2002, 2003, 2004 Dell Inc.
4  * by Matt Domsch <[email protected]>
5  * disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
6  * legacy CHS by Patrick J. LoPresti <[email protected]>
7  *
8  * BIOS Enhanced Disk Drive Services (EDD)
9  * conformant to T13 Committee www.t13.org
10  * projects 1572D, 1484D, 1386D, 1226DT
11  *
12  * This code takes information provided by BIOS EDD calls
13  * fn41 - Check Extensions Present and
14  * fn48 - Get Device Parameters with EDD extensions
15  * made in setup.S, copied to safe structures in setup.c,
16  * and presents it in sysfs.
17  *
18  * Please see http://linux.dell.com/edd/results.html for
19  * the list of BIOSs which have been reported to implement EDD.
20  *
21  * This program is free software; you can redistribute it and/or modify
22  * it under the terms of the GNU General Public License v2.0 as published by
23  * the Free Software Foundation
24  *
25  * This program is distributed in the hope that it will be useful,
26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28  * GNU General Public License for more details.
29  *
30  */
31 
32 #include <linux/module.h>
33 #include <linux/string.h>
34 #include <linux/types.h>
35 #include <linux/init.h>
36 #include <linux/stat.h>
37 #include <linux/err.h>
38 #include <linux/ctype.h>
39 #include <linux/slab.h>
40 #include <linux/limits.h>
41 #include <linux/device.h>
42 #include <linux/pci.h>
43 #include <linux/blkdev.h>
44 #include <linux/edd.h>
45 
46 #define EDD_VERSION "0.16"
47 #define EDD_DATE "2004-Jun-25"
48 
49 MODULE_AUTHOR("Matt Domsch <[email protected]>");
50 MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
51 MODULE_LICENSE("GPL");
53 
54 #define left (PAGE_SIZE - (p - buf) - 1)
55 
56 struct edd_device {
57  unsigned int index;
58  unsigned int mbr_signature;
59  struct edd_info *info;
60  struct kobject kobj;
61 };
62 
63 struct edd_attribute {
64  struct attribute attr;
65  ssize_t(*show) (struct edd_device * edev, char *buf);
66  int (*test) (struct edd_device * edev);
67 };
68 
69 /* forward declarations */
70 static int edd_dev_is_type(struct edd_device *edev, const char *type);
71 static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
72 
73 static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
74 
75 #define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
76 struct edd_attribute edd_attr_##_name = { \
77  .attr = {.name = __stringify(_name), .mode = _mode }, \
78  .show = _show, \
79  .test = _test, \
80 };
81 
82 static int
83 edd_has_mbr_signature(struct edd_device *edev)
84 {
85  return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);
86 }
87 
88 static int
89 edd_has_edd_info(struct edd_device *edev)
90 {
91  return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
92 }
93 
94 static inline struct edd_info *
95 edd_dev_get_info(struct edd_device *edev)
96 {
97  return edev->info;
98 }
99 
100 static inline void
101 edd_dev_set_info(struct edd_device *edev, int i)
102 {
103  edev->index = i;
104  if (edd_has_mbr_signature(edev))
105  edev->mbr_signature = edd.mbr_signature[i];
106  if (edd_has_edd_info(edev))
107  edev->info = &edd.edd_info[i];
108 }
109 
110 #define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)
111 #define to_edd_device(obj) container_of(obj,struct edd_device,kobj)
112 
113 static ssize_t
114 edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
115 {
116  struct edd_device *dev = to_edd_device(kobj);
117  struct edd_attribute *edd_attr = to_edd_attr(attr);
118  ssize_t ret = -EIO;
119 
120  if (edd_attr->show)
121  ret = edd_attr->show(dev, buf);
122  return ret;
123 }
124 
125 static const struct sysfs_ops edd_attr_ops = {
126  .show = edd_attr_show,
127 };
128 
129 static ssize_t
130 edd_show_host_bus(struct edd_device *edev, char *buf)
131 {
132  struct edd_info *info;
133  char *p = buf;
134  int i;
135 
136  if (!edev)
137  return -EINVAL;
138  info = edd_dev_get_info(edev);
139  if (!info || !buf)
140  return -EINVAL;
141 
142  for (i = 0; i < 4; i++) {
143  if (isprint(info->params.host_bus_type[i])) {
144  p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);
145  } else {
146  p += scnprintf(p, left, " ");
147  }
148  }
149 
150  if (!strncmp(info->params.host_bus_type, "ISA", 3)) {
151  p += scnprintf(p, left, "\tbase_address: %x\n",
152  info->params.interface_path.isa.base_address);
153  } else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||
154  !strncmp(info->params.host_bus_type, "PCI", 3) ||
155  !strncmp(info->params.host_bus_type, "XPRS", 4)) {
156  p += scnprintf(p, left,
157  "\t%02x:%02x.%d channel: %u\n",
158  info->params.interface_path.pci.bus,
159  info->params.interface_path.pci.slot,
160  info->params.interface_path.pci.function,
161  info->params.interface_path.pci.channel);
162  } else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
163  !strncmp(info->params.host_bus_type, "HTPT", 4)) {
164  p += scnprintf(p, left,
165  "\tTBD: %llx\n",
166  info->params.interface_path.ibnd.reserved);
167 
168  } else {
169  p += scnprintf(p, left, "\tunknown: %llx\n",
170  info->params.interface_path.unknown.reserved);
171  }
172  return (p - buf);
173 }
174 
175 static ssize_t
176 edd_show_interface(struct edd_device *edev, char *buf)
177 {
178  struct edd_info *info;
179  char *p = buf;
180  int i;
181 
182  if (!edev)
183  return -EINVAL;
184  info = edd_dev_get_info(edev);
185  if (!info || !buf)
186  return -EINVAL;
187 
188  for (i = 0; i < 8; i++) {
189  if (isprint(info->params.interface_type[i])) {
190  p += scnprintf(p, left, "%c", info->params.interface_type[i]);
191  } else {
192  p += scnprintf(p, left, " ");
193  }
194  }
195  if (!strncmp(info->params.interface_type, "ATAPI", 5)) {
196  p += scnprintf(p, left, "\tdevice: %u lun: %u\n",
197  info->params.device_path.atapi.device,
198  info->params.device_path.atapi.lun);
199  } else if (!strncmp(info->params.interface_type, "ATA", 3)) {
200  p += scnprintf(p, left, "\tdevice: %u\n",
201  info->params.device_path.ata.device);
202  } else if (!strncmp(info->params.interface_type, "SCSI", 4)) {
203  p += scnprintf(p, left, "\tid: %u lun: %llu\n",
204  info->params.device_path.scsi.id,
205  info->params.device_path.scsi.lun);
206  } else if (!strncmp(info->params.interface_type, "USB", 3)) {
207  p += scnprintf(p, left, "\tserial_number: %llx\n",
208  info->params.device_path.usb.serial_number);
209  } else if (!strncmp(info->params.interface_type, "1394", 4)) {
210  p += scnprintf(p, left, "\teui: %llx\n",
211  info->params.device_path.i1394.eui);
212  } else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {
213  p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",
214  info->params.device_path.fibre.wwid,
215  info->params.device_path.fibre.lun);
216  } else if (!strncmp(info->params.interface_type, "I2O", 3)) {
217  p += scnprintf(p, left, "\tidentity_tag: %llx\n",
218  info->params.device_path.i2o.identity_tag);
219  } else if (!strncmp(info->params.interface_type, "RAID", 4)) {
220  p += scnprintf(p, left, "\tidentity_tag: %x\n",
221  info->params.device_path.raid.array_number);
222  } else if (!strncmp(info->params.interface_type, "SATA", 4)) {
223  p += scnprintf(p, left, "\tdevice: %u\n",
224  info->params.device_path.sata.device);
225  } else {
226  p += scnprintf(p, left, "\tunknown: %llx %llx\n",
227  info->params.device_path.unknown.reserved1,
228  info->params.device_path.unknown.reserved2);
229  }
230 
231  return (p - buf);
232 }
233 
241 static ssize_t
242 edd_show_raw_data(struct edd_device *edev, char *buf)
243 {
244  struct edd_info *info;
245  ssize_t len = sizeof (info->params);
246  if (!edev)
247  return -EINVAL;
248  info = edd_dev_get_info(edev);
249  if (!info || !buf)
250  return -EINVAL;
251 
252  if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
253  len = info->params.length;
254 
255  /* In case of buggy BIOSs */
256  if (len > (sizeof(info->params)))
257  len = sizeof(info->params);
258 
259  memcpy(buf, &info->params, len);
260  return len;
261 }
262 
263 static ssize_t
264 edd_show_version(struct edd_device *edev, char *buf)
265 {
266  struct edd_info *info;
267  char *p = buf;
268  if (!edev)
269  return -EINVAL;
270  info = edd_dev_get_info(edev);
271  if (!info || !buf)
272  return -EINVAL;
273 
274  p += scnprintf(p, left, "0x%02x\n", info->version);
275  return (p - buf);
276 }
277 
278 static ssize_t
279 edd_show_mbr_signature(struct edd_device *edev, char *buf)
280 {
281  char *p = buf;
282  p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
283  return (p - buf);
284 }
285 
286 static ssize_t
287 edd_show_extensions(struct edd_device *edev, char *buf)
288 {
289  struct edd_info *info;
290  char *p = buf;
291  if (!edev)
292  return -EINVAL;
293  info = edd_dev_get_info(edev);
294  if (!info || !buf)
295  return -EINVAL;
296 
298  p += scnprintf(p, left, "Fixed disk access\n");
299  }
301  p += scnprintf(p, left, "Device locking and ejecting\n");
302  }
304  p += scnprintf(p, left, "Enhanced Disk Drive support\n");
305  }
307  p += scnprintf(p, left, "64-bit extensions\n");
308  }
309  return (p - buf);
310 }
311 
312 static ssize_t
313 edd_show_info_flags(struct edd_device *edev, char *buf)
314 {
315  struct edd_info *info;
316  char *p = buf;
317  if (!edev)
318  return -EINVAL;
319  info = edd_dev_get_info(edev);
320  if (!info || !buf)
321  return -EINVAL;
322 
323  if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
324  p += scnprintf(p, left, "DMA boundary error transparent\n");
325  if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
326  p += scnprintf(p, left, "geometry valid\n");
327  if (info->params.info_flags & EDD_INFO_REMOVABLE)
328  p += scnprintf(p, left, "removable\n");
329  if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
330  p += scnprintf(p, left, "write verify\n");
331  if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
332  p += scnprintf(p, left, "media change notification\n");
333  if (info->params.info_flags & EDD_INFO_LOCKABLE)
334  p += scnprintf(p, left, "lockable\n");
335  if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
336  p += scnprintf(p, left, "no media present\n");
337  if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
338  p += scnprintf(p, left, "use int13 fn50\n");
339  return (p - buf);
340 }
341 
342 static ssize_t
343 edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
344 {
345  struct edd_info *info;
346  char *p = buf;
347  if (!edev)
348  return -EINVAL;
349  info = edd_dev_get_info(edev);
350  if (!info || !buf)
351  return -EINVAL;
352 
353  p += snprintf(p, left, "%u\n", info->legacy_max_cylinder);
354  return (p - buf);
355 }
356 
357 static ssize_t
358 edd_show_legacy_max_head(struct edd_device *edev, char *buf)
359 {
360  struct edd_info *info;
361  char *p = buf;
362  if (!edev)
363  return -EINVAL;
364  info = edd_dev_get_info(edev);
365  if (!info || !buf)
366  return -EINVAL;
367 
368  p += snprintf(p, left, "%u\n", info->legacy_max_head);
369  return (p - buf);
370 }
371 
372 static ssize_t
373 edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
374 {
375  struct edd_info *info;
376  char *p = buf;
377  if (!edev)
378  return -EINVAL;
379  info = edd_dev_get_info(edev);
380  if (!info || !buf)
381  return -EINVAL;
382 
383  p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);
384  return (p - buf);
385 }
386 
387 static ssize_t
388 edd_show_default_cylinders(struct edd_device *edev, char *buf)
389 {
390  struct edd_info *info;
391  char *p = buf;
392  if (!edev)
393  return -EINVAL;
394  info = edd_dev_get_info(edev);
395  if (!info || !buf)
396  return -EINVAL;
397 
398  p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
399  return (p - buf);
400 }
401 
402 static ssize_t
403 edd_show_default_heads(struct edd_device *edev, char *buf)
404 {
405  struct edd_info *info;
406  char *p = buf;
407  if (!edev)
408  return -EINVAL;
409  info = edd_dev_get_info(edev);
410  if (!info || !buf)
411  return -EINVAL;
412 
413  p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
414  return (p - buf);
415 }
416 
417 static ssize_t
418 edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
419 {
420  struct edd_info *info;
421  char *p = buf;
422  if (!edev)
423  return -EINVAL;
424  info = edd_dev_get_info(edev);
425  if (!info || !buf)
426  return -EINVAL;
427 
428  p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
429  return (p - buf);
430 }
431 
432 static ssize_t
433 edd_show_sectors(struct edd_device *edev, char *buf)
434 {
435  struct edd_info *info;
436  char *p = buf;
437  if (!edev)
438  return -EINVAL;
439  info = edd_dev_get_info(edev);
440  if (!info || !buf)
441  return -EINVAL;
442 
443  p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
444  return (p - buf);
445 }
446 
447 
448 /*
449  * Some device instances may not have all the above attributes,
450  * or the attribute values may be meaningless (i.e. if
451  * the device is < EDD 3.0, it won't have host_bus and interface
452  * information), so don't bother making files for them. Likewise
453  * if the default_{cylinders,heads,sectors_per_track} values
454  * are zero, the BIOS doesn't provide sane values, don't bother
455  * creating files for them either.
456  */
457 
458 static int
459 edd_has_legacy_max_cylinder(struct edd_device *edev)
460 {
461  struct edd_info *info;
462  if (!edev)
463  return 0;
464  info = edd_dev_get_info(edev);
465  if (!info)
466  return 0;
467  return info->legacy_max_cylinder > 0;
468 }
469 
470 static int
471 edd_has_legacy_max_head(struct edd_device *edev)
472 {
473  struct edd_info *info;
474  if (!edev)
475  return 0;
476  info = edd_dev_get_info(edev);
477  if (!info)
478  return 0;
479  return info->legacy_max_head > 0;
480 }
481 
482 static int
483 edd_has_legacy_sectors_per_track(struct edd_device *edev)
484 {
485  struct edd_info *info;
486  if (!edev)
487  return 0;
488  info = edd_dev_get_info(edev);
489  if (!info)
490  return 0;
491  return info->legacy_sectors_per_track > 0;
492 }
493 
494 static int
495 edd_has_default_cylinders(struct edd_device *edev)
496 {
497  struct edd_info *info;
498  if (!edev)
499  return 0;
500  info = edd_dev_get_info(edev);
501  if (!info)
502  return 0;
503  return info->params.num_default_cylinders > 0;
504 }
505 
506 static int
507 edd_has_default_heads(struct edd_device *edev)
508 {
509  struct edd_info *info;
510  if (!edev)
511  return 0;
512  info = edd_dev_get_info(edev);
513  if (!info)
514  return 0;
515  return info->params.num_default_heads > 0;
516 }
517 
518 static int
519 edd_has_default_sectors_per_track(struct edd_device *edev)
520 {
521  struct edd_info *info;
522  if (!edev)
523  return 0;
524  info = edd_dev_get_info(edev);
525  if (!info)
526  return 0;
527  return info->params.sectors_per_track > 0;
528 }
529 
530 static int
531 edd_has_edd30(struct edd_device *edev)
532 {
533  struct edd_info *info;
534  int i;
535  u8 csum = 0;
536 
537  if (!edev)
538  return 0;
539  info = edd_dev_get_info(edev);
540  if (!info)
541  return 0;
542 
543  if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) {
544  return 0;
545  }
546 
547 
548  /* We support only T13 spec */
549  if (info->params.device_path_info_length != 44)
550  return 0;
551 
552  for (i = 30; i < info->params.device_path_info_length + 30; i++)
553  csum += *(((u8 *)&info->params) + i);
554 
555  if (csum)
556  return 0;
557 
558  return 1;
559 }
560 
561 
562 static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
563 static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
564 static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
565 static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
566 static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
568  edd_show_legacy_max_cylinder,
569  edd_has_legacy_max_cylinder);
570 static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
571  edd_has_legacy_max_head);
573  edd_show_legacy_sectors_per_track,
574  edd_has_legacy_sectors_per_track);
575 static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
576  edd_has_default_cylinders);
577 static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
578  edd_has_default_heads);
579 static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
580  edd_show_default_sectors_per_track,
581  edd_has_default_sectors_per_track);
582 static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
583 static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
584 static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
585 
586 
587 /* These are default attributes that are added for every edd
588  * device discovered. There are none.
589  */
590 static struct attribute * def_attrs[] = {
591  NULL,
592 };
593 
594 /* These attributes are conditional and only added for some devices. */
595 static struct edd_attribute * edd_attrs[] = {
596  &edd_attr_raw_data,
597  &edd_attr_version,
598  &edd_attr_extensions,
599  &edd_attr_info_flags,
600  &edd_attr_sectors,
601  &edd_attr_legacy_max_cylinder,
602  &edd_attr_legacy_max_head,
603  &edd_attr_legacy_sectors_per_track,
604  &edd_attr_default_cylinders,
605  &edd_attr_default_heads,
606  &edd_attr_default_sectors_per_track,
607  &edd_attr_interface,
608  &edd_attr_host_bus,
609  &edd_attr_mbr_signature,
610  NULL,
611 };
612 
622 static void edd_release(struct kobject * kobj)
623 {
624  struct edd_device * dev = to_edd_device(kobj);
625  kfree(dev);
626 }
627 
628 static struct kobj_type edd_ktype = {
629  .release = edd_release,
630  .sysfs_ops = &edd_attr_ops,
631  .default_attrs = def_attrs,
632 };
633 
634 static struct kset *edd_kset;
635 
636 
644 static int
645 edd_dev_is_type(struct edd_device *edev, const char *type)
646 {
647  struct edd_info *info;
648  if (!edev)
649  return 0;
650  info = edd_dev_get_info(edev);
651 
652  if (type && info) {
653  if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||
654  !strncmp(info->params.interface_type, type, strlen(type)))
655  return 1;
656  }
657  return 0;
658 }
659 
666 static struct pci_dev *
667 edd_get_pci_dev(struct edd_device *edev)
668 {
669  struct edd_info *info = edd_dev_get_info(edev);
670 
671  if (edd_dev_is_type(edev, "PCI") || edd_dev_is_type(edev, "XPRS")) {
672  return pci_get_bus_and_slot(info->params.interface_path.pci.bus,
673  PCI_DEVFN(info->params.interface_path.pci.slot,
674  info->params.interface_path.pci.
675  function));
676  }
677  return NULL;
678 }
679 
680 static int
681 edd_create_symlink_to_pcidev(struct edd_device *edev)
682 {
683 
684  struct pci_dev *pci_dev = edd_get_pci_dev(edev);
685  int ret;
686  if (!pci_dev)
687  return 1;
688  ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
689  pci_dev_put(pci_dev);
690  return ret;
691 }
692 
693 static inline void
694 edd_device_unregister(struct edd_device *edev)
695 {
696  kobject_put(&edev->kobj);
697 }
698 
699 static void edd_populate_dir(struct edd_device * edev)
700 {
701  struct edd_attribute * attr;
702  int error = 0;
703  int i;
704 
705  for (i = 0; (attr = edd_attrs[i]) && !error; i++) {
706  if (!attr->test ||
707  (attr->test && attr->test(edev)))
708  error = sysfs_create_file(&edev->kobj,&attr->attr);
709  }
710 
711  if (!error) {
712  edd_create_symlink_to_pcidev(edev);
713  }
714 }
715 
716 static int
717 edd_device_register(struct edd_device *edev, int i)
718 {
719  int error;
720 
721  if (!edev)
722  return 1;
723  edd_dev_set_info(edev, i);
724  edev->kobj.kset = edd_kset;
725  error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL,
726  "int13_dev%02x", 0x80 + i);
727  if (!error) {
728  edd_populate_dir(edev);
729  kobject_uevent(&edev->kobj, KOBJ_ADD);
730  }
731  return error;
732 }
733 
734 static inline int edd_num_devices(void)
735 {
736  return max_t(unsigned char,
737  min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),
738  min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));
739 }
740 
744 static int __init
745 edd_init(void)
746 {
747  int i;
748  int rc=0;
749  struct edd_device *edev;
750 
751  printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n",
752  EDD_VERSION, EDD_DATE, edd_num_devices());
753 
754  if (!edd_num_devices()) {
755  printk(KERN_INFO "EDD information not available.\n");
756  return -ENODEV;
757  }
758 
759  edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
760  if (!edd_kset)
761  return -ENOMEM;
762 
763  for (i = 0; i < edd_num_devices(); i++) {
764  edev = kzalloc(sizeof (*edev), GFP_KERNEL);
765  if (!edev) {
766  rc = -ENOMEM;
767  goto out;
768  }
769 
770  rc = edd_device_register(edev, i);
771  if (rc) {
772  kfree(edev);
773  goto out;
774  }
775  edd_devices[i] = edev;
776  }
777 
778  return 0;
779 
780 out:
781  while (--i >= 0)
782  edd_device_unregister(edd_devices[i]);
783  kset_unregister(edd_kset);
784  return rc;
785 }
786 
787 static void __exit
788 edd_exit(void)
789 {
790  int i;
791  struct edd_device *edev;
792 
793  for (i = 0; i < edd_num_devices(); i++) {
794  if ((edev = edd_devices[i]))
795  edd_device_unregister(edev);
796  }
797  kset_unregister(edd_kset);
798 }
799 
800 late_initcall(edd_init);
801 module_exit(edd_exit);