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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/firmware/edd.c
4 * Copyright (C) 2002, 2003, 2004 Dell Inc.
5 * by Matt Domsch <Matt_Domsch@dell.com>
6 * disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
7 * legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net>
8 *
9 * BIOS Enhanced Disk Drive Services (EDD)
10 * conformant to T13 Committee www.t13.org
11 * projects 1572D, 1484D, 1386D, 1226DT
12 *
13 * This code takes information provided by BIOS EDD calls
14 * fn41 - Check Extensions Present and
15 * fn48 - Get Device Parameters with EDD extensions
16 * made in setup.S, copied to safe structures in setup.c,
17 * and presents it in sysfs.
18 *
19 * Please see http://linux.dell.com/edd/results.html for
20 * the list of BIOSs which have been reported to implement EDD.
21 */
22
23#include <linux/module.h>
24#include <linux/string.h>
25#include <linux/types.h>
26#include <linux/init.h>
27#include <linux/stat.h>
28#include <linux/err.h>
29#include <linux/ctype.h>
30#include <linux/slab.h>
31#include <linux/limits.h>
32#include <linux/device.h>
33#include <linux/pci.h>
34#include <linux/blkdev.h>
35#include <linux/edd.h>
36
37#define EDD_VERSION "0.16"
38#define EDD_DATE "2004-Jun-25"
39
40MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
41MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
42MODULE_LICENSE("GPL");
43MODULE_VERSION(EDD_VERSION);
44
45#define left (PAGE_SIZE - (p - buf) - 1)
46
47struct edd_device {
48 unsigned int index;
49 unsigned int mbr_signature;
50 struct edd_info *info;
51 struct kobject kobj;
52};
53
54struct edd_attribute {
55 struct attribute attr;
56 ssize_t(*show) (struct edd_device * edev, char *buf);
57 int (*test) (struct edd_device * edev);
58};
59
60/* forward declarations */
61static int edd_dev_is_type(struct edd_device *edev, const char *type);
62static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
63
64static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
65
66#define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
67struct edd_attribute edd_attr_##_name = { \
68 .attr = {.name = __stringify(_name), .mode = _mode }, \
69 .show = _show, \
70 .test = _test, \
71};
72
73static int
74edd_has_mbr_signature(struct edd_device *edev)
75{
76 return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);
77}
78
79static int
80edd_has_edd_info(struct edd_device *edev)
81{
82 return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
83}
84
85static inline struct edd_info *
86edd_dev_get_info(struct edd_device *edev)
87{
88 return edev->info;
89}
90
91static inline void
92edd_dev_set_info(struct edd_device *edev, int i)
93{
94 edev->index = i;
95 if (edd_has_mbr_signature(edev))
96 edev->mbr_signature = edd.mbr_signature[i];
97 if (edd_has_edd_info(edev))
98 edev->info = &edd.edd_info[i];
99}
100
101#define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)
102#define to_edd_device(obj) container_of(obj,struct edd_device,kobj)
103
104static ssize_t
105edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
106{
107 struct edd_device *dev = to_edd_device(kobj);
108 struct edd_attribute *edd_attr = to_edd_attr(attr);
109 ssize_t ret = -EIO;
110
111 if (edd_attr->show)
112 ret = edd_attr->show(dev, buf);
113 return ret;
114}
115
116static const struct sysfs_ops edd_attr_ops = {
117 .show = edd_attr_show,
118};
119
120static ssize_t
121edd_show_host_bus(struct edd_device *edev, char *buf)
122{
123 struct edd_info *info;
124 char *p = buf;
125 int i;
126
127 if (!edev)
128 return -EINVAL;
129 info = edd_dev_get_info(edev);
130 if (!info || !buf)
131 return -EINVAL;
132
133 for (i = 0; i < 4; i++) {
134 if (isprint(info->params.host_bus_type[i])) {
135 p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);
136 } else {
137 p += scnprintf(p, left, " ");
138 }
139 }
140
141 if (!strncmp(info->params.host_bus_type, "ISA", 3)) {
142 p += scnprintf(p, left, "\tbase_address: %x\n",
143 info->params.interface_path.isa.base_address);
144 } else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||
145 !strncmp(info->params.host_bus_type, "PCI", 3) ||
146 !strncmp(info->params.host_bus_type, "XPRS", 4)) {
147 p += scnprintf(p, left,
148 "\t%02x:%02x.%d channel: %u\n",
149 info->params.interface_path.pci.bus,
150 info->params.interface_path.pci.slot,
151 info->params.interface_path.pci.function,
152 info->params.interface_path.pci.channel);
153 } else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
154 !strncmp(info->params.host_bus_type, "HTPT", 4)) {
155 p += scnprintf(p, left,
156 "\tTBD: %llx\n",
157 info->params.interface_path.ibnd.reserved);
158
159 } else {
160 p += scnprintf(p, left, "\tunknown: %llx\n",
161 info->params.interface_path.unknown.reserved);
162 }
163 return (p - buf);
164}
165
166static ssize_t
167edd_show_interface(struct edd_device *edev, char *buf)
168{
169 struct edd_info *info;
170 char *p = buf;
171 int i;
172
173 if (!edev)
174 return -EINVAL;
175 info = edd_dev_get_info(edev);
176 if (!info || !buf)
177 return -EINVAL;
178
179 for (i = 0; i < 8; i++) {
180 if (isprint(info->params.interface_type[i])) {
181 p += scnprintf(p, left, "%c", info->params.interface_type[i]);
182 } else {
183 p += scnprintf(p, left, " ");
184 }
185 }
186 if (!strncmp(info->params.interface_type, "ATAPI", 5)) {
187 p += scnprintf(p, left, "\tdevice: %u lun: %u\n",
188 info->params.device_path.atapi.device,
189 info->params.device_path.atapi.lun);
190 } else if (!strncmp(info->params.interface_type, "ATA", 3)) {
191 p += scnprintf(p, left, "\tdevice: %u\n",
192 info->params.device_path.ata.device);
193 } else if (!strncmp(info->params.interface_type, "SCSI", 4)) {
194 p += scnprintf(p, left, "\tid: %u lun: %llu\n",
195 info->params.device_path.scsi.id,
196 info->params.device_path.scsi.lun);
197 } else if (!strncmp(info->params.interface_type, "USB", 3)) {
198 p += scnprintf(p, left, "\tserial_number: %llx\n",
199 info->params.device_path.usb.serial_number);
200 } else if (!strncmp(info->params.interface_type, "1394", 4)) {
201 p += scnprintf(p, left, "\teui: %llx\n",
202 info->params.device_path.i1394.eui);
203 } else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {
204 p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",
205 info->params.device_path.fibre.wwid,
206 info->params.device_path.fibre.lun);
207 } else if (!strncmp(info->params.interface_type, "I2O", 3)) {
208 p += scnprintf(p, left, "\tidentity_tag: %llx\n",
209 info->params.device_path.i2o.identity_tag);
210 } else if (!strncmp(info->params.interface_type, "RAID", 4)) {
211 p += scnprintf(p, left, "\tidentity_tag: %x\n",
212 info->params.device_path.raid.array_number);
213 } else if (!strncmp(info->params.interface_type, "SATA", 4)) {
214 p += scnprintf(p, left, "\tdevice: %u\n",
215 info->params.device_path.sata.device);
216 } else {
217 p += scnprintf(p, left, "\tunknown: %llx %llx\n",
218 info->params.device_path.unknown.reserved1,
219 info->params.device_path.unknown.reserved2);
220 }
221
222 return (p - buf);
223}
224
225/**
226 * edd_show_raw_data() - copies raw data to buffer for userspace to parse
227 * @edev: target edd_device
228 * @buf: output buffer
229 *
230 * Returns: number of bytes written, or -EINVAL on failure
231 */
232static ssize_t
233edd_show_raw_data(struct edd_device *edev, char *buf)
234{
235 struct edd_info *info;
236 ssize_t len = sizeof (info->params);
237 if (!edev)
238 return -EINVAL;
239 info = edd_dev_get_info(edev);
240 if (!info || !buf)
241 return -EINVAL;
242
243 if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
244 len = info->params.length;
245
246 /* In case of buggy BIOSs */
247 if (len > (sizeof(info->params)))
248 len = sizeof(info->params);
249
250 memcpy(buf, &info->params, len);
251 return len;
252}
253
254static ssize_t
255edd_show_version(struct edd_device *edev, char *buf)
256{
257 struct edd_info *info;
258 char *p = buf;
259 if (!edev)
260 return -EINVAL;
261 info = edd_dev_get_info(edev);
262 if (!info || !buf)
263 return -EINVAL;
264
265 p += scnprintf(p, left, "0x%02x\n", info->version);
266 return (p - buf);
267}
268
269static ssize_t
270edd_show_mbr_signature(struct edd_device *edev, char *buf)
271{
272 char *p = buf;
273 p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
274 return (p - buf);
275}
276
277static ssize_t
278edd_show_extensions(struct edd_device *edev, char *buf)
279{
280 struct edd_info *info;
281 char *p = buf;
282 if (!edev)
283 return -EINVAL;
284 info = edd_dev_get_info(edev);
285 if (!info || !buf)
286 return -EINVAL;
287
288 if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
289 p += scnprintf(p, left, "Fixed disk access\n");
290 }
291 if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
292 p += scnprintf(p, left, "Device locking and ejecting\n");
293 }
294 if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
295 p += scnprintf(p, left, "Enhanced Disk Drive support\n");
296 }
297 if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
298 p += scnprintf(p, left, "64-bit extensions\n");
299 }
300 return (p - buf);
301}
302
303static ssize_t
304edd_show_info_flags(struct edd_device *edev, char *buf)
305{
306 struct edd_info *info;
307 char *p = buf;
308 if (!edev)
309 return -EINVAL;
310 info = edd_dev_get_info(edev);
311 if (!info || !buf)
312 return -EINVAL;
313
314 if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
315 p += scnprintf(p, left, "DMA boundary error transparent\n");
316 if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
317 p += scnprintf(p, left, "geometry valid\n");
318 if (info->params.info_flags & EDD_INFO_REMOVABLE)
319 p += scnprintf(p, left, "removable\n");
320 if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
321 p += scnprintf(p, left, "write verify\n");
322 if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
323 p += scnprintf(p, left, "media change notification\n");
324 if (info->params.info_flags & EDD_INFO_LOCKABLE)
325 p += scnprintf(p, left, "lockable\n");
326 if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
327 p += scnprintf(p, left, "no media present\n");
328 if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
329 p += scnprintf(p, left, "use int13 fn50\n");
330 return (p - buf);
331}
332
333static ssize_t
334edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
335{
336 struct edd_info *info;
337 char *p = buf;
338 if (!edev)
339 return -EINVAL;
340 info = edd_dev_get_info(edev);
341 if (!info || !buf)
342 return -EINVAL;
343
344 p += scnprintf(p, left, "%u\n", info->legacy_max_cylinder);
345 return (p - buf);
346}
347
348static ssize_t
349edd_show_legacy_max_head(struct edd_device *edev, char *buf)
350{
351 struct edd_info *info;
352 char *p = buf;
353 if (!edev)
354 return -EINVAL;
355 info = edd_dev_get_info(edev);
356 if (!info || !buf)
357 return -EINVAL;
358
359 p += scnprintf(p, left, "%u\n", info->legacy_max_head);
360 return (p - buf);
361}
362
363static ssize_t
364edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
365{
366 struct edd_info *info;
367 char *p = buf;
368 if (!edev)
369 return -EINVAL;
370 info = edd_dev_get_info(edev);
371 if (!info || !buf)
372 return -EINVAL;
373
374 p += scnprintf(p, left, "%u\n", info->legacy_sectors_per_track);
375 return (p - buf);
376}
377
378static ssize_t
379edd_show_default_cylinders(struct edd_device *edev, char *buf)
380{
381 struct edd_info *info;
382 char *p = buf;
383 if (!edev)
384 return -EINVAL;
385 info = edd_dev_get_info(edev);
386 if (!info || !buf)
387 return -EINVAL;
388
389 p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
390 return (p - buf);
391}
392
393static ssize_t
394edd_show_default_heads(struct edd_device *edev, char *buf)
395{
396 struct edd_info *info;
397 char *p = buf;
398 if (!edev)
399 return -EINVAL;
400 info = edd_dev_get_info(edev);
401 if (!info || !buf)
402 return -EINVAL;
403
404 p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
405 return (p - buf);
406}
407
408static ssize_t
409edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
410{
411 struct edd_info *info;
412 char *p = buf;
413 if (!edev)
414 return -EINVAL;
415 info = edd_dev_get_info(edev);
416 if (!info || !buf)
417 return -EINVAL;
418
419 p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
420 return (p - buf);
421}
422
423static ssize_t
424edd_show_sectors(struct edd_device *edev, char *buf)
425{
426 struct edd_info *info;
427 char *p = buf;
428 if (!edev)
429 return -EINVAL;
430 info = edd_dev_get_info(edev);
431 if (!info || !buf)
432 return -EINVAL;
433
434 p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
435 return (p - buf);
436}
437
438
439/*
440 * Some device instances may not have all the above attributes,
441 * or the attribute values may be meaningless (i.e. if
442 * the device is < EDD 3.0, it won't have host_bus and interface
443 * information), so don't bother making files for them. Likewise
444 * if the default_{cylinders,heads,sectors_per_track} values
445 * are zero, the BIOS doesn't provide sane values, don't bother
446 * creating files for them either.
447 */
448
449static int
450edd_has_legacy_max_cylinder(struct edd_device *edev)
451{
452 struct edd_info *info;
453 if (!edev)
454 return 0;
455 info = edd_dev_get_info(edev);
456 if (!info)
457 return 0;
458 return info->legacy_max_cylinder > 0;
459}
460
461static int
462edd_has_legacy_max_head(struct edd_device *edev)
463{
464 struct edd_info *info;
465 if (!edev)
466 return 0;
467 info = edd_dev_get_info(edev);
468 if (!info)
469 return 0;
470 return info->legacy_max_head > 0;
471}
472
473static int
474edd_has_legacy_sectors_per_track(struct edd_device *edev)
475{
476 struct edd_info *info;
477 if (!edev)
478 return 0;
479 info = edd_dev_get_info(edev);
480 if (!info)
481 return 0;
482 return info->legacy_sectors_per_track > 0;
483}
484
485static int
486edd_has_default_cylinders(struct edd_device *edev)
487{
488 struct edd_info *info;
489 if (!edev)
490 return 0;
491 info = edd_dev_get_info(edev);
492 if (!info)
493 return 0;
494 return info->params.num_default_cylinders > 0;
495}
496
497static int
498edd_has_default_heads(struct edd_device *edev)
499{
500 struct edd_info *info;
501 if (!edev)
502 return 0;
503 info = edd_dev_get_info(edev);
504 if (!info)
505 return 0;
506 return info->params.num_default_heads > 0;
507}
508
509static int
510edd_has_default_sectors_per_track(struct edd_device *edev)
511{
512 struct edd_info *info;
513 if (!edev)
514 return 0;
515 info = edd_dev_get_info(edev);
516 if (!info)
517 return 0;
518 return info->params.sectors_per_track > 0;
519}
520
521static int
522edd_has_edd30(struct edd_device *edev)
523{
524 struct edd_info *info;
525 int i;
526 u8 csum = 0;
527
528 if (!edev)
529 return 0;
530 info = edd_dev_get_info(edev);
531 if (!info)
532 return 0;
533
534 if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) {
535 return 0;
536 }
537
538
539 /* We support only T13 spec */
540 if (info->params.device_path_info_length != 44)
541 return 0;
542
543 for (i = 30; i < info->params.device_path_info_length + 30; i++)
544 csum += *(((u8 *)&info->params) + i);
545
546 if (csum)
547 return 0;
548
549 return 1;
550}
551
552
553static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
554static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
555static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
556static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
557static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
558static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
559 edd_show_legacy_max_cylinder,
560 edd_has_legacy_max_cylinder);
561static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
562 edd_has_legacy_max_head);
563static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
564 edd_show_legacy_sectors_per_track,
565 edd_has_legacy_sectors_per_track);
566static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
567 edd_has_default_cylinders);
568static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
569 edd_has_default_heads);
570static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
571 edd_show_default_sectors_per_track,
572 edd_has_default_sectors_per_track);
573static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
574static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
575static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
576
577
578/* These are default attributes that are added for every edd
579 * device discovered. There are none.
580 */
581static struct attribute * def_attrs[] = {
582 NULL,
583};
584
585/* These attributes are conditional and only added for some devices. */
586static struct edd_attribute * edd_attrs[] = {
587 &edd_attr_raw_data,
588 &edd_attr_version,
589 &edd_attr_extensions,
590 &edd_attr_info_flags,
591 &edd_attr_sectors,
592 &edd_attr_legacy_max_cylinder,
593 &edd_attr_legacy_max_head,
594 &edd_attr_legacy_sectors_per_track,
595 &edd_attr_default_cylinders,
596 &edd_attr_default_heads,
597 &edd_attr_default_sectors_per_track,
598 &edd_attr_interface,
599 &edd_attr_host_bus,
600 &edd_attr_mbr_signature,
601 NULL,
602};
603
604/**
605 * edd_release - free edd structure
606 * @kobj: kobject of edd structure
607 *
608 * This is called when the refcount of the edd structure
609 * reaches 0. This should happen right after we unregister,
610 * but just in case, we use the release callback anyway.
611 */
612
613static void edd_release(struct kobject * kobj)
614{
615 struct edd_device * dev = to_edd_device(kobj);
616 kfree(dev);
617}
618
619static struct kobj_type edd_ktype = {
620 .release = edd_release,
621 .sysfs_ops = &edd_attr_ops,
622 .default_attrs = def_attrs,
623};
624
625static struct kset *edd_kset;
626
627
628/**
629 * edd_dev_is_type() - is this EDD device a 'type' device?
630 * @edev: target edd_device
631 * @type: a host bus or interface identifier string per the EDD spec
632 *
633 * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
634 */
635static int
636edd_dev_is_type(struct edd_device *edev, const char *type)
637{
638 struct edd_info *info;
639 if (!edev)
640 return 0;
641 info = edd_dev_get_info(edev);
642
643 if (type && info) {
644 if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||
645 !strncmp(info->params.interface_type, type, strlen(type)))
646 return 1;
647 }
648 return 0;
649}
650
651/**
652 * edd_get_pci_dev() - finds pci_dev that matches edev
653 * @edev: edd_device
654 *
655 * Returns pci_dev if found, or NULL
656 */
657static struct pci_dev *
658edd_get_pci_dev(struct edd_device *edev)
659{
660 struct edd_info *info = edd_dev_get_info(edev);
661
662 if (edd_dev_is_type(edev, "PCI") || edd_dev_is_type(edev, "XPRS")) {
663 return pci_get_domain_bus_and_slot(0,
664 info->params.interface_path.pci.bus,
665 PCI_DEVFN(info->params.interface_path.pci.slot,
666 info->params.interface_path.pci.function));
667 }
668 return NULL;
669}
670
671static int
672edd_create_symlink_to_pcidev(struct edd_device *edev)
673{
674
675 struct pci_dev *pci_dev = edd_get_pci_dev(edev);
676 int ret;
677 if (!pci_dev)
678 return 1;
679 ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
680 pci_dev_put(pci_dev);
681 return ret;
682}
683
684static inline void
685edd_device_unregister(struct edd_device *edev)
686{
687 kobject_put(&edev->kobj);
688}
689
690static void edd_populate_dir(struct edd_device * edev)
691{
692 struct edd_attribute * attr;
693 int error = 0;
694 int i;
695
696 for (i = 0; (attr = edd_attrs[i]) && !error; i++) {
697 if (!attr->test ||
698 (attr->test && attr->test(edev)))
699 error = sysfs_create_file(&edev->kobj,&attr->attr);
700 }
701
702 if (!error) {
703 edd_create_symlink_to_pcidev(edev);
704 }
705}
706
707static int
708edd_device_register(struct edd_device *edev, int i)
709{
710 int error;
711
712 if (!edev)
713 return 1;
714 edd_dev_set_info(edev, i);
715 edev->kobj.kset = edd_kset;
716 error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL,
717 "int13_dev%02x", 0x80 + i);
718 if (!error) {
719 edd_populate_dir(edev);
720 kobject_uevent(&edev->kobj, KOBJ_ADD);
721 }
722 return error;
723}
724
725static inline int edd_num_devices(void)
726{
727 return max_t(unsigned char,
728 min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),
729 min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));
730}
731
732/**
733 * edd_init() - creates sysfs tree of EDD data
734 */
735static int __init
736edd_init(void)
737{
738 int i;
739 int rc=0;
740 struct edd_device *edev;
741
742 if (!edd_num_devices())
743 return -ENODEV;
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 edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
749 if (!edd_kset)
750 return -ENOMEM;
751
752 for (i = 0; i < edd_num_devices(); i++) {
753 edev = kzalloc(sizeof (*edev), GFP_KERNEL);
754 if (!edev) {
755 rc = -ENOMEM;
756 goto out;
757 }
758
759 rc = edd_device_register(edev, i);
760 if (rc) {
761 kfree(edev);
762 goto out;
763 }
764 edd_devices[i] = edev;
765 }
766
767 return 0;
768
769out:
770 while (--i >= 0)
771 edd_device_unregister(edd_devices[i]);
772 kset_unregister(edd_kset);
773 return rc;
774}
775
776static void __exit
777edd_exit(void)
778{
779 int i;
780 struct edd_device *edev;
781
782 for (i = 0; i < edd_num_devices(); i++) {
783 if ((edev = edd_devices[i]))
784 edd_device_unregister(edev);
785 }
786 kset_unregister(edd_kset);
787}
788
789late_initcall(edd_init);
790module_exit(edd_exit);
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
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 }, \
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);
118 ssize_t ret = -EIO;
119
120 if (edd_attr->show)
121 ret = edd_attr->show(dev, buf);
122 return ret;
123}
124
125static const 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 !strncmp(info->params.host_bus_type, "XPRS", 4)) {
156 p += scnprintf(p, left,
157 "\t%02x:%02x.%d channel: %u\n",
158 info->params.interface_path.pci.bus,
159 info->params.interface_path.pci.slot,
160 info->params.interface_path.pci.function,
161 info->params.interface_path.pci.channel);
162 } else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
163 !strncmp(info->params.host_bus_type, "HTPT", 4)) {
164 p += scnprintf(p, left,
165 "\tTBD: %llx\n",
166 info->params.interface_path.ibnd.reserved);
167
168 } else {
169 p += scnprintf(p, left, "\tunknown: %llx\n",
170 info->params.interface_path.unknown.reserved);
171 }
172 return (p - buf);
173}
174
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 * @edev: target edd_device
237 * @buf: output buffer
238 *
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;
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
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
628static struct kobj_type edd_ktype = {
629 .release = edd_release,
630 .sysfs_ops = &edd_attr_ops,
631 .default_attrs = def_attrs,
632};
633
634static 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 */
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
662 * @edev: edd_device
663 *
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") || edd_dev_is_type(edev, "XPRS")) {
672 return pci_get_bus_and_slot(info->params.interface_path.pci.bus,
673 PCI_DEVFN(info->params.interface_path.pci.slot,
674 info->params.interface_path.pci.
675 function));
676 }
677 return NULL;
678}
679
680static int
681edd_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
693static inline void
694edd_device_unregister(struct edd_device *edev)
695{
696 kobject_put(&edev->kobj);
697}
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;
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
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{
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
780out:
781 while (--i >= 0)
782 edd_device_unregister(edd_devices[i]);
783 kset_unregister(edd_kset);
784 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 }
797 kset_unregister(edd_kset);
798}
799
800late_initcall(edd_init);
801module_exit(edd_exit);