[PATCH] Fix race in efi variable delete code
[linux-2.6.git] / drivers / firmware / edd.c
1 /*
2  * linux/drivers/firmware/edd.c
3  *  Copyright (C) 2002, 2003, 2004 Dell Inc.
4  *  by Matt Domsch <Matt_Domsch@dell.com>
5  *  disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
6  *  legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net>
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 Parametes 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/edd30/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 <Matt_Domsch@Dell.com>");
50 MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
51 MODULE_LICENSE("GPL");
52 MODULE_VERSION(EDD_VERSION);
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, .owner = THIS_MODULE },     \
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 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                 p += scnprintf(p, left,
156                              "\t%02x:%02x.%d  channel: %u\n",
157                              info->params.interface_path.pci.bus,
158                              info->params.interface_path.pci.slot,
159                              info->params.interface_path.pci.function,
160                              info->params.interface_path.pci.channel);
161         } else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
162                    !strncmp(info->params.host_bus_type, "XPRS", 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
234 /**
235  * edd_show_raw_data() - copies raw data to buffer for userspace to parse
236  *
237  * Returns: number of bytes written, or -EINVAL on failure
238  */
239 static ssize_t
240 edd_show_raw_data(struct edd_device *edev, char *buf)
241 {
242         struct edd_info *info;
243         ssize_t len = sizeof (info->params);
244         if (!edev)
245                 return -EINVAL;
246         info = edd_dev_get_info(edev);
247         if (!info || !buf)
248                 return -EINVAL;
249
250         if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
251                 len = info->params.length;
252
253         /* In case of buggy BIOSs */
254         if (len > (sizeof(info->params)))
255                 len = sizeof(info->params);
256
257         memcpy(buf, &info->params, len);
258         return len;
259 }
260
261 static ssize_t
262 edd_show_version(struct edd_device *edev, char *buf)
263 {
264         struct edd_info *info;
265         char *p = buf;
266         if (!edev)
267                 return -EINVAL;
268         info = edd_dev_get_info(edev);
269         if (!info || !buf)
270                 return -EINVAL;
271
272         p += scnprintf(p, left, "0x%02x\n", info->version);
273         return (p - buf);
274 }
275
276 static ssize_t
277 edd_show_mbr_signature(struct edd_device *edev, char *buf)
278 {
279         char *p = buf;
280         p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
281         return (p - buf);
282 }
283
284 static ssize_t
285 edd_show_extensions(struct edd_device *edev, char *buf)
286 {
287         struct edd_info *info;
288         char *p = buf;
289         if (!edev)
290                 return -EINVAL;
291         info = edd_dev_get_info(edev);
292         if (!info || !buf)
293                 return -EINVAL;
294
295         if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
296                 p += scnprintf(p, left, "Fixed disk access\n");
297         }
298         if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
299                 p += scnprintf(p, left, "Device locking and ejecting\n");
300         }
301         if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
302                 p += scnprintf(p, left, "Enhanced Disk Drive support\n");
303         }
304         if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
305                 p += scnprintf(p, left, "64-bit extensions\n");
306         }
307         return (p - buf);
308 }
309
310 static ssize_t
311 edd_show_info_flags(struct edd_device *edev, char *buf)
312 {
313         struct edd_info *info;
314         char *p = buf;
315         if (!edev)
316                 return -EINVAL;
317         info = edd_dev_get_info(edev);
318         if (!info || !buf)
319                 return -EINVAL;
320
321         if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
322                 p += scnprintf(p, left, "DMA boundary error transparent\n");
323         if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
324                 p += scnprintf(p, left, "geometry valid\n");
325         if (info->params.info_flags & EDD_INFO_REMOVABLE)
326                 p += scnprintf(p, left, "removable\n");
327         if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
328                 p += scnprintf(p, left, "write verify\n");
329         if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
330                 p += scnprintf(p, left, "media change notification\n");
331         if (info->params.info_flags & EDD_INFO_LOCKABLE)
332                 p += scnprintf(p, left, "lockable\n");
333         if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
334                 p += scnprintf(p, left, "no media present\n");
335         if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
336                 p += scnprintf(p, left, "use int13 fn50\n");
337         return (p - buf);
338 }
339
340 static ssize_t
341 edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
342 {
343         struct edd_info *info;
344         char *p = buf;
345         if (!edev)
346                 return -EINVAL;
347         info = edd_dev_get_info(edev);
348         if (!info || !buf)
349                 return -EINVAL;
350
351         p += snprintf(p, left, "%u\n", info->legacy_max_cylinder);
352         return (p - buf);
353 }
354
355 static ssize_t
356 edd_show_legacy_max_head(struct edd_device *edev, char *buf)
357 {
358         struct edd_info *info;
359         char *p = buf;
360         if (!edev)
361                 return -EINVAL;
362         info = edd_dev_get_info(edev);
363         if (!info || !buf)
364                 return -EINVAL;
365
366         p += snprintf(p, left, "%u\n", info->legacy_max_head);
367         return (p - buf);
368 }
369
370 static ssize_t
371 edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
372 {
373         struct edd_info *info;
374         char *p = buf;
375         if (!edev)
376                 return -EINVAL;
377         info = edd_dev_get_info(edev);
378         if (!info || !buf)
379                 return -EINVAL;
380
381         p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);
382         return (p - buf);
383 }
384
385 static ssize_t
386 edd_show_default_cylinders(struct edd_device *edev, char *buf)
387 {
388         struct edd_info *info;
389         char *p = buf;
390         if (!edev)
391                 return -EINVAL;
392         info = edd_dev_get_info(edev);
393         if (!info || !buf)
394                 return -EINVAL;
395
396         p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
397         return (p - buf);
398 }
399
400 static ssize_t
401 edd_show_default_heads(struct edd_device *edev, char *buf)
402 {
403         struct edd_info *info;
404         char *p = buf;
405         if (!edev)
406                 return -EINVAL;
407         info = edd_dev_get_info(edev);
408         if (!info || !buf)
409                 return -EINVAL;
410
411         p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
412         return (p - buf);
413 }
414
415 static ssize_t
416 edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
417 {
418         struct edd_info *info;
419         char *p = buf;
420         if (!edev)
421                 return -EINVAL;
422         info = edd_dev_get_info(edev);
423         if (!info || !buf)
424                 return -EINVAL;
425
426         p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
427         return (p - buf);
428 }
429
430 static ssize_t
431 edd_show_sectors(struct edd_device *edev, char *buf)
432 {
433         struct edd_info *info;
434         char *p = buf;
435         if (!edev)
436                 return -EINVAL;
437         info = edd_dev_get_info(edev);
438         if (!info || !buf)
439                 return -EINVAL;
440
441         p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
442         return (p - buf);
443 }
444
445
446 /*
447  * Some device instances may not have all the above attributes,
448  * or the attribute values may be meaningless (i.e. if
449  * the device is < EDD 3.0, it won't have host_bus and interface
450  * information), so don't bother making files for them.  Likewise
451  * if the default_{cylinders,heads,sectors_per_track} values
452  * are zero, the BIOS doesn't provide sane values, don't bother
453  * creating files for them either.
454  */
455
456 static int
457 edd_has_legacy_max_cylinder(struct edd_device *edev)
458 {
459         struct edd_info *info;
460         if (!edev)
461                 return 0;
462         info = edd_dev_get_info(edev);
463         if (!info)
464                 return 0;
465         return info->legacy_max_cylinder > 0;
466 }
467
468 static int
469 edd_has_legacy_max_head(struct edd_device *edev)
470 {
471         struct edd_info *info;
472         if (!edev)
473                 return 0;
474         info = edd_dev_get_info(edev);
475         if (!info)
476                 return 0;
477         return info->legacy_max_head > 0;
478 }
479
480 static int
481 edd_has_legacy_sectors_per_track(struct edd_device *edev)
482 {
483         struct edd_info *info;
484         if (!edev)
485                 return 0;
486         info = edd_dev_get_info(edev);
487         if (!info)
488                 return 0;
489         return info->legacy_sectors_per_track > 0;
490 }
491
492 static int
493 edd_has_default_cylinders(struct edd_device *edev)
494 {
495         struct edd_info *info;
496         if (!edev)
497                 return 0;
498         info = edd_dev_get_info(edev);
499         if (!info)
500                 return 0;
501         return info->params.num_default_cylinders > 0;
502 }
503
504 static int
505 edd_has_default_heads(struct edd_device *edev)
506 {
507         struct edd_info *info;
508         if (!edev)
509                 return 0;
510         info = edd_dev_get_info(edev);
511         if (!info)
512                 return 0;
513         return info->params.num_default_heads > 0;
514 }
515
516 static int
517 edd_has_default_sectors_per_track(struct edd_device *edev)
518 {
519         struct edd_info *info;
520         if (!edev)
521                 return 0;
522         info = edd_dev_get_info(edev);
523         if (!info)
524                 return 0;
525         return info->params.sectors_per_track > 0;
526 }
527
528 static int
529 edd_has_edd30(struct edd_device *edev)
530 {
531         struct edd_info *info;
532         int i, nonzero_path = 0;
533         char c;
534
535         if (!edev)
536                 return 0;
537         info = edd_dev_get_info(edev);
538         if (!info)
539                 return 0;
540
541         if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) {
542                 return 0;
543         }
544
545         for (i = 30; i <= 73; i++) {
546                 c = *(((uint8_t *) info) + i + 4);
547                 if (c) {
548                         nonzero_path++;
549                         break;
550                 }
551         }
552         if (!nonzero_path) {
553                 return 0;
554         }
555
556         return 1;
557 }
558
559
560 static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
561 static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
562 static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
563 static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
564 static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
565 static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
566                        edd_show_legacy_max_cylinder,
567                        edd_has_legacy_max_cylinder);
568 static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
569                        edd_has_legacy_max_head);
570 static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
571                        edd_show_legacy_sectors_per_track,
572                        edd_has_legacy_sectors_per_track);
573 static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
574                        edd_has_default_cylinders);
575 static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
576                        edd_has_default_heads);
577 static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
578                        edd_show_default_sectors_per_track,
579                        edd_has_default_sectors_per_track);
580 static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
581 static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
582 static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
583
584
585 /* These are default attributes that are added for every edd
586  * device discovered.  There are none.
587  */
588 static struct attribute * def_attrs[] = {
589         NULL,
590 };
591
592 /* These attributes are conditional and only added for some devices. */
593 static struct edd_attribute * edd_attrs[] = {
594         &edd_attr_raw_data,
595         &edd_attr_version,
596         &edd_attr_extensions,
597         &edd_attr_info_flags,
598         &edd_attr_sectors,
599         &edd_attr_legacy_max_cylinder,
600         &edd_attr_legacy_max_head,
601         &edd_attr_legacy_sectors_per_track,
602         &edd_attr_default_cylinders,
603         &edd_attr_default_heads,
604         &edd_attr_default_sectors_per_track,
605         &edd_attr_interface,
606         &edd_attr_host_bus,
607         &edd_attr_mbr_signature,
608         NULL,
609 };
610
611 /**
612  *      edd_release - free edd structure
613  *      @kobj:  kobject of edd structure
614  *
615  *      This is called when the refcount of the edd structure
616  *      reaches 0. This should happen right after we unregister,
617  *      but just in case, we use the release callback anyway.
618  */
619
620 static void edd_release(struct kobject * kobj)
621 {
622         struct edd_device * dev = to_edd_device(kobj);
623         kfree(dev);
624 }
625
626 static struct kobj_type ktype_edd = {
627         .release        = edd_release,
628         .sysfs_ops      = &edd_attr_ops,
629         .default_attrs  = def_attrs,
630 };
631
632 static decl_subsys(edd,&ktype_edd,NULL);
633
634
635 /**
636  * edd_dev_is_type() - is this EDD device a 'type' device?
637  * @edev
638  * @type - a host bus or interface identifier string per the EDD spec
639  *
640  * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
641  */
642 static int
643 edd_dev_is_type(struct edd_device *edev, const char *type)
644 {
645         struct edd_info *info;
646         if (!edev)
647                 return 0;
648         info = edd_dev_get_info(edev);
649
650         if (type && info) {
651                 if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||
652                     !strncmp(info->params.interface_type, type, strlen(type)))
653                         return 1;
654         }
655         return 0;
656 }
657
658 /**
659  * edd_get_pci_dev() - finds pci_dev that matches edev
660  * @edev - edd_device
661  *
662  * Returns pci_dev if found, or NULL
663  */
664 static struct pci_dev *
665 edd_get_pci_dev(struct edd_device *edev)
666 {
667         struct edd_info *info = edd_dev_get_info(edev);
668
669         if (edd_dev_is_type(edev, "PCI")) {
670                 return pci_find_slot(info->params.interface_path.pci.bus,
671                                      PCI_DEVFN(info->params.interface_path.pci.slot,
672                                                info->params.interface_path.pci.
673                                                function));
674         }
675         return NULL;
676 }
677
678 static int
679 edd_create_symlink_to_pcidev(struct edd_device *edev)
680 {
681
682         struct pci_dev *pci_dev = edd_get_pci_dev(edev);
683         if (!pci_dev)
684                 return 1;
685         return sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
686 }
687
688 static inline void
689 edd_device_unregister(struct edd_device *edev)
690 {
691         kobject_unregister(&edev->kobj);
692 }
693
694 static void edd_populate_dir(struct edd_device * edev)
695 {
696         struct edd_attribute * attr;
697         int error = 0;
698         int i;
699
700         for (i = 0; (attr = edd_attrs[i]) && !error; i++) {
701                 if (!attr->test ||
702                     (attr->test && attr->test(edev)))
703                         error = sysfs_create_file(&edev->kobj,&attr->attr);
704         }
705
706         if (!error) {
707                 edd_create_symlink_to_pcidev(edev);
708         }
709 }
710
711 static int
712 edd_device_register(struct edd_device *edev, int i)
713 {
714         int error;
715
716         if (!edev)
717                 return 1;
718         edd_dev_set_info(edev, i);
719         kobject_set_name(&edev->kobj, "int13_dev%02x",
720                          0x80 + i);
721         kobj_set_kset_s(edev,edd_subsys);
722         error = kobject_register(&edev->kobj);
723         if (!error)
724                 edd_populate_dir(edev);
725         return error;
726 }
727
728 static inline int edd_num_devices(void)
729 {
730         return max_t(unsigned char,
731                      min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),
732                      min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));
733 }
734
735 /**
736  * edd_init() - creates sysfs tree of EDD data
737  */
738 static int __init
739 edd_init(void)
740 {
741         unsigned int i;
742         int rc=0;
743         struct edd_device *edev;
744
745         printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n",
746                EDD_VERSION, EDD_DATE, edd_num_devices());
747
748         if (!edd_num_devices()) {
749                 printk(KERN_INFO "EDD information not available.\n");
750                 return 1;
751         }
752
753         rc = firmware_register(&edd_subsys);
754         if (rc)
755                 return rc;
756
757         for (i = 0; i < edd_num_devices() && !rc; i++) {
758                 edev = kzalloc(sizeof (*edev), GFP_KERNEL);
759                 if (!edev)
760                         return -ENOMEM;
761
762                 rc = edd_device_register(edev, i);
763                 if (rc) {
764                         kfree(edev);
765                         break;
766                 }
767                 edd_devices[i] = edev;
768         }
769
770         if (rc)
771                 firmware_unregister(&edd_subsys);
772         return rc;
773 }
774
775 static void __exit
776 edd_exit(void)
777 {
778         int i;
779         struct edd_device *edev;
780
781         for (i = 0; i < edd_num_devices(); i++) {
782                 if ((edev = edd_devices[i]))
783                         edd_device_unregister(edev);
784         }
785         firmware_unregister(&edd_subsys);
786 }
787
788 late_initcall(edd_init);
789 module_exit(edd_exit);