blob: b4502ed65793a01a198b666ecba4fc7e45ac286a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/i386/kernel/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
49MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
50MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
51MODULE_LICENSE("GPL");
52MODULE_VERSION(EDD_VERSION);
53
54#define left (PAGE_SIZE - (p - buf) - 1)
55
56struct edd_device {
57 unsigned int index;
58 unsigned int mbr_signature;
59 struct edd_info *info;
60 struct kobject kobj;
61};
62
63struct 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 */
70static int edd_dev_is_type(struct edd_device *edev, const char *type);
71static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
72
73static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
74
75#define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
76struct edd_attribute edd_attr_##_name = { \
77 .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
78 .show = _show, \
79 .test = _test, \
80};
81
82static int
83edd_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
88static int
89edd_has_edd_info(struct edd_device *edev)
90{
91 return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
92}
93
94static inline struct edd_info *
95edd_dev_get_info(struct edd_device *edev)
96{
97 return edev->info;
98}
99
100static inline void
101edd_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
113static ssize_t
114edd_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);
Dmitry Torokhov70f28172005-04-29 01:27:34 -0500118 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 if (edd_attr->show)
121 ret = edd_attr->show(dev, buf);
122 return ret;
123}
124
125static struct sysfs_ops edd_attr_ops = {
126 .show = edd_attr_show,
127};
128
129static ssize_t
130edd_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
175static ssize_t
176edd_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 */
239static ssize_t
240edd_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
261static ssize_t
262edd_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
276static ssize_t
277edd_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
284static ssize_t
285edd_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
310static ssize_t
311edd_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
340static ssize_t
341edd_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
355static ssize_t
356edd_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
370static ssize_t
371edd_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
385static ssize_t
386edd_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
400static ssize_t
401edd_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
415static ssize_t
416edd_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
430static ssize_t
431edd_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
456static int
457edd_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
468static int
469edd_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
480static int
481edd_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
492static int
493edd_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
504static int
505edd_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
516static int
517edd_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
528static int
529edd_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
560static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
561static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
562static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
563static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
564static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
565static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
566 edd_show_legacy_max_cylinder,
567 edd_has_legacy_max_cylinder);
568static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
569 edd_has_legacy_max_head);
570static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
571 edd_show_legacy_sectors_per_track,
572 edd_has_legacy_sectors_per_track);
573static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
574 edd_has_default_cylinders);
575static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
576 edd_has_default_heads);
577static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
578 edd_show_default_sectors_per_track,
579 edd_has_default_sectors_per_track);
580static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
581static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
582static 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 */
588static struct attribute * def_attrs[] = {
589 NULL,
590};
591
592/* These attributes are conditional and only added for some devices. */
593static 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
620static void edd_release(struct kobject * kobj)
621{
622 struct edd_device * dev = to_edd_device(kobj);
623 kfree(dev);
624}
625
626static struct kobj_type ktype_edd = {
627 .release = edd_release,
628 .sysfs_ops = &edd_attr_ops,
629 .default_attrs = def_attrs,
630};
631
632static 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 */
642static int
643edd_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 */
664static struct pci_dev *
665edd_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
678static int
679edd_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
688static inline void
689edd_device_unregister(struct edd_device *edev)
690{
691 kobject_unregister(&edev->kobj);
692}
693
694static 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
711static int
712edd_device_register(struct edd_device *edev, int i)
713{
714 int error;
715
716 if (!edev)
717 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 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
728static 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 */
738static int __init
739edd_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++) {
Deepak Saxena9c215382005-11-07 01:01:24 -0800758 edev = kzalloc(sizeof (*edev), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 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
775static void __exit
776edd_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
788late_initcall(edd_init);
789module_exit(edd_exit);