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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Uwe Zeisbergerf30c2262006-10-03 23:01:26 +02002 * linux/drivers/firmware/edd.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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
Joe Perchesd48140e2008-02-03 17:13:40 +020014 * fn48 - Get Device Parameters with EDD extensions
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 * 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 = { \
Tejun Heo7b595752007-06-14 03:45:17 +090077 .attr = {.name = __stringify(_name), .mode = _mode }, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 .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
Emese Revfy52cf25d2010-01-19 02:58:23 +0100125static const struct sysfs_ops edd_attr_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 .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
Randy Dunlap6e8c8182007-02-10 01:46:03 -0800236 * @edev: target edd_device
237 * @buf: output buffer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 *
239 * Returns: number of bytes written, or -EINVAL on failure
240 */
241static ssize_t
242edd_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
263static ssize_t
264edd_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
278static ssize_t
279edd_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
286static ssize_t
287edd_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
312static ssize_t
313edd_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
342static ssize_t
343edd_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
357static ssize_t
358edd_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
372static ssize_t
373edd_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
387static ssize_t
388edd_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
402static ssize_t
403edd_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
417static ssize_t
418edd_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
432static ssize_t
433edd_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
458static int
459edd_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
470static int
471edd_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
482static int
483edd_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
494static int
495edd_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
506static int
507edd_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
518static int
519edd_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
530static int
531edd_has_edd30(struct edd_device *edev)
532{
533 struct edd_info *info;
534 int i, nonzero_path = 0;
535 char c;
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 for (i = 30; i <= 73; i++) {
548 c = *(((uint8_t *) info) + i + 4);
549 if (c) {
550 nonzero_path++;
551 break;
552 }
553 }
554 if (!nonzero_path) {
555 return 0;
556 }
557
558 return 1;
559}
560
561
562static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
563static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
564static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
565static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
566static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
567static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
568 edd_show_legacy_max_cylinder,
569 edd_has_legacy_max_cylinder);
570static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
571 edd_has_legacy_max_head);
572static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
573 edd_show_legacy_sectors_per_track,
574 edd_has_legacy_sectors_per_track);
575static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
576 edd_has_default_cylinders);
577static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
578 edd_has_default_heads);
579static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
580 edd_show_default_sectors_per_track,
581 edd_has_default_sectors_per_track);
582static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
583static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
584static 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 */
590static struct attribute * def_attrs[] = {
591 NULL,
592};
593
594/* These attributes are conditional and only added for some devices. */
595static 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
622static void edd_release(struct kobject * kobj)
623{
624 struct edd_device * dev = to_edd_device(kobj);
625 kfree(dev);
626}
627
Greg Kroah-Hartmane89a4112007-10-11 10:47:49 -0600628static struct kobj_type edd_ktype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 .release = edd_release,
630 .sysfs_ops = &edd_attr_ops,
631 .default_attrs = def_attrs,
632};
633
Greg Kroah-Hartman9651d352007-11-02 16:19:59 -0700634static struct kset *edd_kset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
636
637/**
638 * edd_dev_is_type() - is this EDD device a 'type' device?
Randy Dunlap6e8c8182007-02-10 01:46:03 -0800639 * @edev: target edd_device
640 * @type: a host bus or interface identifier string per the EDD spec
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 *
642 * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
643 */
644static int
645edd_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
Randy Dunlap6e8c8182007-02-10 01:46:03 -0800662 * @edev: edd_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 *
664 * Returns pci_dev if found, or NULL
665 */
666static struct pci_dev *
667edd_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")) {
Alan Cox1b28f222007-07-15 23:40:02 -0700672 return pci_get_bus_and_slot(info->params.interface_path.pci.bus,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 PCI_DEVFN(info->params.interface_path.pci.slot,
674 info->params.interface_path.pci.
675 function));
676 }
677 return NULL;
678}
679
680static int
681edd_create_symlink_to_pcidev(struct edd_device *edev)
682{
683
684 struct pci_dev *pci_dev = edd_get_pci_dev(edev);
Alan Cox1b28f222007-07-15 23:40:02 -0700685 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 if (!pci_dev)
687 return 1;
Alan Cox1b28f222007-07-15 23:40:02 -0700688 ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
689 pci_dev_put(pci_dev);
690 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691}
692
693static inline void
694edd_device_unregister(struct edd_device *edev)
695{
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800696 kobject_put(&edev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697}
698
699static 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
716static int
717edd_device_register(struct edd_device *edev, int i)
718{
719 int error;
720
721 if (!edev)
722 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 edd_dev_set_info(edev, i);
Greg Kroah-Hartman9651d352007-11-02 16:19:59 -0700724 edev->kobj.kset = edd_kset;
Greg Kroah-Hartmandd002e82007-12-17 15:54:39 -0400725 error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL,
726 "int13_dev%02x", 0x80 + i);
727 if (!error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 edd_populate_dir(edev);
Greg Kroah-Hartmandd002e82007-12-17 15:54:39 -0400729 kobject_uevent(&edev->kobj, KOBJ_ADD);
730 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 return error;
732}
733
734static 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 */
744static int __init
745edd_init(void)
746{
Axel Lin1986aaf2010-08-09 17:20:56 -0700747 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 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");
Alexey Dobriyanf6266e32008-06-05 22:46:03 -0700756 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 }
758
Greg Kroah-Hartmanf62ed9e2007-11-05 13:16:15 -0800759 edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
Greg Kroah-Hartman9651d352007-11-02 16:19:59 -0700760 if (!edd_kset)
761 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
Axel Lin1986aaf2010-08-09 17:20:56 -0700763 for (i = 0; i < edd_num_devices(); i++) {
Deepak Saxena9c215382005-11-07 01:01:24 -0800764 edev = kzalloc(sizeof (*edev), GFP_KERNEL);
Axel Lin1986aaf2010-08-09 17:20:56 -0700765 if (!edev) {
766 rc = -ENOMEM;
767 goto out;
768 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
770 rc = edd_device_register(edev, i);
771 if (rc) {
772 kfree(edev);
Axel Lin1986aaf2010-08-09 17:20:56 -0700773 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 }
775 edd_devices[i] = edev;
776 }
777
Axel Lin1986aaf2010-08-09 17:20:56 -0700778 return 0;
779
780out:
781 while (--i >= 0)
782 edd_device_unregister(edd_devices[i]);
783 kset_unregister(edd_kset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 return rc;
785}
786
787static void __exit
788edd_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 }
Greg Kroah-Hartman9651d352007-11-02 16:19:59 -0700797 kset_unregister(edd_kset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798}
799
800late_initcall(edd_init);
801module_exit(edd_exit);