firmware: Sigma: Fix endianess issues
[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 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 <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 },   \
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                 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  * @edev: target edd_device
237  * @buf: output buffer
238  *
239  * Returns: number of bytes written, or -EINVAL on failure
240  */
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
297         if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
298                 p += scnprintf(p, left, "Fixed disk access\n");
299         }
300         if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
301                 p += scnprintf(p, left, "Device locking and ejecting\n");
302         }
303         if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
304                 p += scnprintf(p, left, "Enhanced Disk Drive support\n");
305         }
306         if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
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);
567 static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
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);
572 static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
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
613 /**
614  *      edd_release - free edd structure
615  *      @kobj:  kobject of edd structure
616  *
617  *      This is called when the refcount of the edd structure
618  *      reaches 0. This should happen right after we unregister,
619  *      but just in case, we use the release callback anyway.
620  */
621
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
637 /**
638  * edd_dev_is_type() - is this EDD device a 'type' device?
639  * @edev: target edd_device
640  * @type: a host bus or interface identifier string per the EDD spec
641  *
642  * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
643  */
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
660 /**
661  * edd_get_pci_dev() - finds pci_dev that matches edev
662  * @edev: edd_device
663  *
664  * Returns pci_dev if found, or NULL
665  */
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")) {
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
741 /**
742  * edd_init() - creates sysfs tree of EDD data
743  */
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);