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   1 /*
   2  * linux/drivers/firmware/edd.c
   3  *  Copyright (C) 2002, 2003, 2004 Dell Inc.
   4  *  by Matt Domsch <Matt_Domsch@dell.com>
   5  *  disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
   6  *  legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net>
   7  *
   8  * BIOS Enhanced Disk Drive Services (EDD)
   9  * conformant to T13 Committee www.t13.org
  10  *   projects 1572D, 1484D, 1386D, 1226DT
  11  *
  12  * This code takes information provided by BIOS EDD calls
  13  * fn41 - Check Extensions Present and
  14  * fn48 - Get Device Parametes with EDD extensions
  15  * made in setup.S, copied to safe structures in setup.c,
  16  * and presents it in sysfs.
  17  *
  18  * Please see http://linux.dell.com/edd30/results.html for
  19  * the list of BIOSs which have been reported to implement EDD.
  20  *
  21  * This program is free software; you can redistribute it and/or modify
  22  * it under the terms of the GNU General Public License v2.0 as published by
  23  * the Free Software Foundation
  24  *
  25  * This program is distributed in the hope that it will be useful,
  26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  * GNU General Public License for more details.
  29  *
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/string.h>
  34 #include <linux/types.h>
  35 #include <linux/init.h>
  36 #include <linux/stat.h>
  37 #include <linux/err.h>
  38 #include <linux/ctype.h>
  39 #include <linux/slab.h>
  40 #include <linux/limits.h>
  41 #include <linux/device.h>
  42 #include <linux/pci.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/edd.h>
  45
  46 #define EDD_VERSION "0.16"
  47 #define EDD_DATE    "2004-Jun-25"
  48
  49 MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
  50 MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
  51 MODULE_LICENSE("GPL");
  52 MODULE_VERSION(EDD_VERSION);
  53
  54 #define left (PAGE_SIZE - (p - buf) - 1)
  55
  56 struct edd_device {
  57         unsigned int index;
  58         unsigned int mbr_signature;
  59         struct edd_info *info;
  60         struct kobject kobj;
  61 };
  62
  63 struct edd_attribute {
  64         struct attribute attr;
  65         ssize_t(*show) (struct edd_device * edev, char *buf);
  66         int (*test) (struct edd_device * edev);
  67 };
  68
  69 /* forward declarations */
  70 static int edd_dev_is_type(struct edd_device *edev, const char *type);
  71 static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
  72
  73 static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
  74
  75 #define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
  76 struct edd_attribute edd_attr_##_name = {       \
  77         .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },     \
  78         .show   = _show,                                \
  79         .test   = _test,                                \
  80 };
  81
  82 static int
  83 edd_has_mbr_signature(struct edd_device *edev)
  84 {
  85         return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);
  86 }
  87
  88 static int
  89 edd_has_edd_info(struct edd_device *edev)
  90 {
  91         return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
  92 }
  93
  94 static inline struct edd_info *
  95 edd_dev_get_info(struct edd_device *edev)
  96 {
  97         return edev->info;
  98 }
  99
 100 static inline void
 101 edd_dev_set_info(struct edd_device *edev, int i)
 102 {
 103         edev->index = i;
 104         if (edd_has_mbr_signature(edev))
 105                 edev->mbr_signature = edd.mbr_signature[i];
 106         if (edd_has_edd_info(edev))
 107                 edev->info = &edd.edd_info[i];
 108 }
 109
 110 #define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)
 111 #define to_edd_device(obj) container_of(obj,struct edd_device,kobj)
 112
 113 static ssize_t
 114 edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
 115 {
 116         struct edd_device *dev = to_edd_device(kobj);
 117         struct edd_attribute *edd_attr = to_edd_attr(attr);
 118         ssize_t ret = -EIO;
 119
 120         if (edd_attr->show)
 121                 ret = edd_attr->show(dev, buf);
 122         return ret;
 123 }
 124
 125 static struct sysfs_ops edd_attr_ops = {
 126         .show = edd_attr_show,
 127 };
 128
 129 static ssize_t
 130 edd_show_host_bus(struct edd_device *edev, char *buf)
 131 {
 132         struct edd_info *info;
 133         char *p = buf;
 134         int i;
 135
 136         if (!edev)
 137                 return -EINVAL;
 138         info = edd_dev_get_info(edev);
 139         if (!info || !buf)
 140                 return -EINVAL;
 141
 142         for (i = 0; i < 4; i++) {
 143                 if (isprint(info->params.host_bus_type[i])) {
 144                         p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);
 145                 } else {
 146                         p += scnprintf(p, left, " ");
 147                 }
 148         }
 149
 150         if (!strncmp(info->params.host_bus_type, "ISA", 3)) {
 151                 p += scnprintf(p, left, "\tbase_address: %x\n",
 152                              info->params.interface_path.isa.base_address);
 153         } else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||
 154                    !strncmp(info->params.host_bus_type, "PCI", 3)) {
 155                 p += scnprintf(p, left,
 156                              "\t%02x:%02x.%d  channel: %u\n",
 157                              info->params.interface_path.pci.bus,
 158                              info->params.interface_path.pci.slot,
 159                              info->params.interface_path.pci.function,
 160                              info->params.interface_path.pci.channel);
 161         } else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
 162                    !strncmp(info->params.host_bus_type, "XPRS", 4) ||
 163                    !strncmp(info->params.host_bus_type, "HTPT", 4)) {
 164                 p += scnprintf(p, left,
 165                              "\tTBD: %llx\n",
 166                              info->params.interface_path.ibnd.reserved);
 167
 168         } else {
 169                 p += scnprintf(p, left, "\tunknown: %llx\n",
 170                              info->params.interface_path.unknown.reserved);
 171         }
 172         return (p - buf);
 173 }
 174
 175 static ssize_t
 176 edd_show_interface(struct edd_device *edev, char *buf)
 177 {
 178         struct edd_info *info;
 179         char *p = buf;
 180         int i;
 181
 182         if (!edev)
 183                 return -EINVAL;
 184         info = edd_dev_get_info(edev);
 185         if (!info || !buf)
 186                 return -EINVAL;
 187
 188         for (i = 0; i < 8; i++) {
 189                 if (isprint(info->params.interface_type[i])) {
 190                         p += scnprintf(p, left, "%c", info->params.interface_type[i]);
 191                 } else {
 192                         p += scnprintf(p, left, " ");
 193                 }
 194         }
 195         if (!strncmp(info->params.interface_type, "ATAPI", 5)) {
 196                 p += scnprintf(p, left, "\tdevice: %u  lun: %u\n",
 197                              info->params.device_path.atapi.device,
 198                              info->params.device_path.atapi.lun);
 199         } else if (!strncmp(info->params.interface_type, "ATA", 3)) {
 200                 p += scnprintf(p, left, "\tdevice: %u\n",
 201                              info->params.device_path.ata.device);
 202         } else if (!strncmp(info->params.interface_type, "SCSI", 4)) {
 203                 p += scnprintf(p, left, "\tid: %u  lun: %llu\n",
 204                              info->params.device_path.scsi.id,
 205                              info->params.device_path.scsi.lun);
 206         } else if (!strncmp(info->params.interface_type, "USB", 3)) {
 207                 p += scnprintf(p, left, "\tserial_number: %llx\n",
 208                              info->params.device_path.usb.serial_number);
 209         } else if (!strncmp(info->params.interface_type, "1394", 4)) {
 210                 p += scnprintf(p, left, "\teui: %llx\n",
 211                              info->params.device_path.i1394.eui);
 212         } else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {
 213                 p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",
 214                              info->params.device_path.fibre.wwid,
 215                              info->params.device_path.fibre.lun);
 216         } else if (!strncmp(info->params.interface_type, "I2O", 3)) {
 217                 p += scnprintf(p, left, "\tidentity_tag: %llx\n",
 218                              info->params.device_path.i2o.identity_tag);
 219         } else if (!strncmp(info->params.interface_type, "RAID", 4)) {
 220                 p += scnprintf(p, left, "\tidentity_tag: %x\n",
 221                              info->params.device_path.raid.array_number);
 222         } else if (!strncmp(info->params.interface_type, "SATA", 4)) {
 223                 p += scnprintf(p, left, "\tdevice: %u\n",
 224                              info->params.device_path.sata.device);
 225         } else {
 226                 p += scnprintf(p, left, "\tunknown: %llx %llx\n",
 227                              info->params.device_path.unknown.reserved1,
 228                              info->params.device_path.unknown.reserved2);
 229         }
 230
 231         return (p - buf);
 232 }
 233
 234 /**
 235  * edd_show_raw_data() - copies raw data to buffer for userspace to parse
 236  *
 237  * Returns: number of bytes written, or -EINVAL on failure
 238  */
 239 static ssize_t
 240 edd_show_raw_data(struct edd_device *edev, char *buf)
 241 {
 242         struct edd_info *info;
 243         ssize_t len = sizeof (info->params);
 244         if (!edev)
 245                 return -EINVAL;
 246         info = edd_dev_get_info(edev);
 247         if (!info || !buf)
 248                 return -EINVAL;
 249
 250         if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
 251                 len = info->params.length;
 252
 253         /* In case of buggy BIOSs */
 254         if (len > (sizeof(info->params)))
 255                 len = sizeof(info->params);
 256
 257         memcpy(buf, &info->params, len);
 258         return len;
 259 }
 260
 261 static ssize_t
 262 edd_show_version(struct edd_device *edev, char *buf)
 263 {
 264         struct edd_info *info;
 265         char *p = buf;
 266         if (!edev)
 267                 return -EINVAL;
 268         info = edd_dev_get_info(edev);
 269         if (!info || !buf)
 270                 return -EINVAL;
 271
 272         p += scnprintf(p, left, "0x%02x\n", info->version);
 273         return (p - buf);
 274 }
 275
 276 static ssize_t
 277 edd_show_mbr_signature(struct edd_device *edev, char *buf)
 278 {
 279         char *p = buf;
 280         p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
 281         return (p - buf);
 282 }
 283
 284 static ssize_t
 285 edd_show_extensions(struct edd_device *edev, char *buf)
 286 {
 287         struct edd_info *info;
 288         char *p = buf;
 289         if (!edev)
 290                 return -EINVAL;
 291         info = edd_dev_get_info(edev);
 292         if (!info || !buf)
 293                 return -EINVAL;
 294
 295         if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
 296                 p += scnprintf(p, left, "Fixed disk access\n");
 297         }
 298         if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
 299                 p += scnprintf(p, left, "Device locking and ejecting\n");
 300         }
 301         if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
 302                 p += scnprintf(p, left, "Enhanced Disk Drive support\n");
 303         }
 304         if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
 305                 p += scnprintf(p, left, "64-bit extensions\n");
 306         }
 307         return (p - buf);
 308 }
 309
 310 static ssize_t
 311 edd_show_info_flags(struct edd_device *edev, char *buf)
 312 {
 313         struct edd_info *info;
 314         char *p = buf;
 315         if (!edev)
 316                 return -EINVAL;
 317         info = edd_dev_get_info(edev);
 318         if (!info || !buf)
 319                 return -EINVAL;
 320
 321         if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
 322                 p += scnprintf(p, left, "DMA boundary error transparent\n");
 323         if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
 324                 p += scnprintf(p, left, "geometry valid\n");
 325         if (info->params.info_flags & EDD_INFO_REMOVABLE)
 326                 p += scnprintf(p, left, "removable\n");
 327         if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
 328                 p += scnprintf(p, left, "write verify\n");
 329         if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
 330                 p += scnprintf(p, left, "media change notification\n");
 331         if (info->params.info_flags & EDD_INFO_LOCKABLE)
 332                 p += scnprintf(p, left, "lockable\n");
 333         if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
 334                 p += scnprintf(p, left, "no media present\n");
 335         if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
 336                 p += scnprintf(p, left, "use int13 fn50\n");
 337         return (p - buf);
 338 }
 339
 340 static ssize_t
 341 edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
 342 {
 343         struct edd_info *info;
 344         char *p = buf;
 345         if (!edev)
 346                 return -EINVAL;
 347         info = edd_dev_get_info(edev);
 348         if (!info || !buf)
 349                 return -EINVAL;
 350
 351         p += snprintf(p, left, "%u\n", info->legacy_max_cylinder);
 352         return (p - buf);
 353 }
 354
 355 static ssize_t
 356 edd_show_legacy_max_head(struct edd_device *edev, char *buf)
 357 {
 358         struct edd_info *info;
 359         char *p = buf;
 360         if (!edev)
 361                 return -EINVAL;
 362         info = edd_dev_get_info(edev);
 363         if (!info || !buf)
 364                 return -EINVAL;
 365
 366         p += snprintf(p, left, "%u\n", info->legacy_max_head);
 367         return (p - buf);
 368 }
 369
 370 static ssize_t
 371 edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
 372 {
 373         struct edd_info *info;
 374         char *p = buf;
 375         if (!edev)
 376                 return -EINVAL;
 377         info = edd_dev_get_info(edev);
 378         if (!info || !buf)
 379                 return -EINVAL;
 380
 381         p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);
 382         return (p - buf);
 383 }
 384
 385 static ssize_t
 386 edd_show_default_cylinders(struct edd_device *edev, char *buf)
 387 {
 388         struct edd_info *info;
 389         char *p = buf;
 390         if (!edev)
 391                 return -EINVAL;
 392         info = edd_dev_get_info(edev);
 393         if (!info || !buf)
 394                 return -EINVAL;
 395
 396         p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
 397         return (p - buf);
 398 }
 399
 400 static ssize_t
 401 edd_show_default_heads(struct edd_device *edev, char *buf)
 402 {
 403         struct edd_info *info;
 404         char *p = buf;
 405         if (!edev)
 406                 return -EINVAL;
 407         info = edd_dev_get_info(edev);
 408         if (!info || !buf)
 409                 return -EINVAL;
 410
 411         p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
 412         return (p - buf);
 413 }
 414
 415 static ssize_t
 416 edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
 417 {
 418         struct edd_info *info;
 419         char *p = buf;
 420         if (!edev)
 421                 return -EINVAL;
 422         info = edd_dev_get_info(edev);
 423         if (!info || !buf)
 424                 return -EINVAL;
 425
 426         p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
 427         return (p - buf);
 428 }
 429
 430 static ssize_t
 431 edd_show_sectors(struct edd_device *edev, char *buf)
 432 {
 433         struct edd_info *info;
 434         char *p = buf;
 435         if (!edev)
 436                 return -EINVAL;
 437         info = edd_dev_get_info(edev);
 438         if (!info || !buf)
 439                 return -EINVAL;
 440
 441         p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
 442         return (p - buf);
 443 }
 444
 445
 446 /*
 447  * Some device instances may not have all the above attributes,
 448  * or the attribute values may be meaningless (i.e. if
 449  * the device is < EDD 3.0, it won't have host_bus and interface
 450  * information), so don't bother making files for them.  Likewise
 451  * if the default_{cylinders,heads,sectors_per_track} values
 452  * are zero, the BIOS doesn't provide sane values, don't bother
 453  * creating files for them either.
 454  */
 455
 456 static int
 457 edd_has_legacy_max_cylinder(struct edd_device *edev)
 458 {
 459         struct edd_info *info;
 460         if (!edev)
 461                 return 0;
 462         info = edd_dev_get_info(edev);
 463         if (!info)
 464                 return 0;
 465         return info->legacy_max_cylinder > 0;
 466 }
 467
 468 static int
 469 edd_has_legacy_max_head(struct edd_device *edev)
 470 {
 471         struct edd_info *info;
 472         if (!edev)
 473                 return 0;
 474         info = edd_dev_get_info(edev);
 475         if (!info)
 476                 return 0;
 477         return info->legacy_max_head > 0;
 478 }
 479
 480 static int
 481 edd_has_legacy_sectors_per_track(struct edd_device *edev)
 482 {
 483         struct edd_info *info;
 484         if (!edev)
 485                 return 0;
 486         info = edd_dev_get_info(edev);
 487         if (!info)
 488                 return 0;
 489         return info->legacy_sectors_per_track > 0;
 490 }
 491
 492 static int
 493 edd_has_default_cylinders(struct edd_device *edev)
 494 {
 495         struct edd_info *info;
 496         if (!edev)
 497                 return 0;
 498         info = edd_dev_get_info(edev);
 499         if (!info)
 500                 return 0;
 501         return info->params.num_default_cylinders > 0;
 502 }
 503
 504 static int
 505 edd_has_default_heads(struct edd_device *edev)
 506 {
 507         struct edd_info *info;
 508         if (!edev)
 509                 return 0;
 510         info = edd_dev_get_info(edev);
 511         if (!info)
 512                 return 0;
 513         return info->params.num_default_heads > 0;
 514 }
 515
 516 static int
 517 edd_has_default_sectors_per_track(struct edd_device *edev)
 518 {
 519         struct edd_info *info;
 520         if (!edev)
 521                 return 0;
 522         info = edd_dev_get_info(edev);
 523         if (!info)
 524                 return 0;
 525         return info->params.sectors_per_track > 0;
 526 }
 527
 528 static int
 529 edd_has_edd30(struct edd_device *edev)
 530 {
 531         struct edd_info *info;
 532         int i, nonzero_path = 0;
 533         char c;
 534
 535         if (!edev)
 536                 return 0;
 537         info = edd_dev_get_info(edev);
 538         if (!info)
 539                 return 0;
 540
 541         if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) {
 542                 return 0;
 543         }
 544
 545         for (i = 30; i <= 73; i++) {
 546                 c = *(((uint8_t *) info) + i + 4);
 547                 if (c) {
 548                         nonzero_path++;
 549                         break;
 550                 }
 551         }
 552         if (!nonzero_path) {
 553                 return 0;
 554         }
 555
 556         return 1;
 557 }
 558
 559
 560 static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
 561 static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
 562 static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
 563 static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
 564 static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
 565 static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
 566                        edd_show_legacy_max_cylinder,
 567                        edd_has_legacy_max_cylinder);
 568 static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
 569                        edd_has_legacy_max_head);
 570 static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
 571                        edd_show_legacy_sectors_per_track,
 572                        edd_has_legacy_sectors_per_track);
 573 static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
 574                        edd_has_default_cylinders);
 575 static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
 576                        edd_has_default_heads);
 577 static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
 578                        edd_show_default_sectors_per_track,
 579                        edd_has_default_sectors_per_track);
 580 static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
 581 static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
 582 static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
 583
 584
 585 /* These are default attributes that are added for every edd
 586  * device discovered.  There are none.
 587  */
 588 static struct attribute * def_attrs[] = {
 589         NULL,
 590 };
 591
 592 /* These attributes are conditional and only added for some devices. */
 593 static struct edd_attribute * edd_attrs[] = {
 594         &edd_attr_raw_data,
 595         &edd_attr_version,
 596         &edd_attr_extensions,
 597         &edd_attr_info_flags,
 598         &edd_attr_sectors,
 599         &edd_attr_legacy_max_cylinder,
 600         &edd_attr_legacy_max_head,
 601         &edd_attr_legacy_sectors_per_track,
 602         &edd_attr_default_cylinders,
 603         &edd_attr_default_heads,
 604         &edd_attr_default_sectors_per_track,
 605         &edd_attr_interface,
 606         &edd_attr_host_bus,
 607         &edd_attr_mbr_signature,
 608         NULL,
 609 };
 610
 611 /**
 612  *      edd_release - free edd structure
 613  *      @kobj:  kobject of edd structure
 614  *
 615  *      This is called when the refcount of the edd structure
 616  *      reaches 0. This should happen right after we unregister,
 617  *      but just in case, we use the release callback anyway.
 618  */
 619
 620 static void edd_release(struct kobject * kobj)
 621 {
 622         struct edd_device * dev = to_edd_device(kobj);
 623         kfree(dev);
 624 }
 625
 626 static struct kobj_type ktype_edd = {
 627         .release        = edd_release,
 628         .sysfs_ops      = &edd_attr_ops,
 629         .default_attrs  = def_attrs,
 630 };
 631
 632 static decl_subsys(edd,&ktype_edd,NULL);
 633
 634
 635 /**
 636  * edd_dev_is_type() - is this EDD device a 'type' device?
 637  * @edev
 638  * @type - a host bus or interface identifier string per the EDD spec
 639  *
 640  * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
 641  */
 642 static int
 643 edd_dev_is_type(struct edd_device *edev, const char *type)
 644 {
 645         struct edd_info *info;
 646         if (!edev)
 647                 return 0;
 648         info = edd_dev_get_info(edev);
 649
 650         if (type && info) {
 651                 if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||
 652                     !strncmp(info->params.interface_type, type, strlen(type)))
 653                         return 1;
 654         }
 655         return 0;
 656 }
 657
 658 /**
 659  * edd_get_pci_dev() - finds pci_dev that matches edev
 660  * @edev - edd_device
 661  *
 662  * Returns pci_dev if found, or NULL
 663  */
 664 static struct pci_dev *
 665 edd_get_pci_dev(struct edd_device *edev)
 666 {
 667         struct edd_info *info = edd_dev_get_info(edev);
 668
 669         if (edd_dev_is_type(edev, "PCI")) {
 670                 return pci_find_slot(info->params.interface_path.pci.bus,
 671                                      PCI_DEVFN(info->params.interface_path.pci.slot,
 672                                                info->params.interface_path.pci.
 673                                                function));
 674         }
 675         return NULL;
 676 }
 677
 678 static int
 679 edd_create_symlink_to_pcidev(struct edd_device *edev)
 680 {
 681
 682         struct pci_dev *pci_dev = edd_get_pci_dev(edev);
 683         if (!pci_dev)
 684                 return 1;
 685         return sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
 686 }
 687
 688 static inline void
 689 edd_device_unregister(struct edd_device *edev)
 690 {
 691         kobject_unregister(&edev->kobj);
 692 }
 693
 694 static void edd_populate_dir(struct edd_device * edev)
 695 {
 696         struct edd_attribute * attr;
 697         int error = 0;
 698         int i;
 699
 700         for (i = 0; (attr = edd_attrs[i]) && !error; i++) {
 701                 if (!attr->test ||
 702                     (attr->test && attr->test(edev)))
 703                         error = sysfs_create_file(&edev->kobj,&attr->attr);
 704         }
 705
 706         if (!error) {
 707                 edd_create_symlink_to_pcidev(edev);
 708         }
 709 }
 710
 711 static int
 712 edd_device_register(struct edd_device *edev, int i)
 713 {
 714         int error;
 715
 716         if (!edev)
 717                 return 1;
 718         edd_dev_set_info(edev, i);
 719         kobject_set_name(&edev->kobj, "int13_dev%02x",
 720                          0x80 + i);
 721         kobj_set_kset_s(edev,edd_subsys);
 722         error = kobject_register(&edev->kobj);
 723         if (!error)
 724                 edd_populate_dir(edev);
 725         return error;
 726 }
 727
 728 static inline int edd_num_devices(void)
 729 {
 730         return max_t(unsigned char,
 731                      min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),
 732                      min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));
 733 }
 734
 735 /**
 736  * edd_init() - creates sysfs tree of EDD data
 737  */
 738 static int __init
 739 edd_init(void)
 740 {
 741         unsigned int i;
 742         int rc=0;
 743         struct edd_device *edev;
 744
 745         printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n",
 746                EDD_VERSION, EDD_DATE, edd_num_devices());
 747
 748         if (!edd_num_devices()) {
 749                 printk(KERN_INFO "EDD information not available.\n");
 750                 return 1;
 751         }
 752
 753         rc = firmware_register(&edd_subsys);
 754         if (rc)
 755                 return rc;
 756
 757         for (i = 0; i < edd_num_devices() && !rc; i++) {
 758                 edev = kzalloc(sizeof (*edev), GFP_KERNEL);
 759                 if (!edev)
 760                         return -ENOMEM;
 761
 762                 rc = edd_device_register(edev, i);
 763                 if (rc) {
 764                         kfree(edev);
 765                         break;
 766                 }
 767                 edd_devices[i] = edev;
 768         }
 769
 770         if (rc)
 771                 firmware_unregister(&edd_subsys);
 772         return rc;
 773 }
 774
 775 static void __exit
 776 edd_exit(void)
 777 {
 778         int i;
 779         struct edd_device *edev;
 780
 781         for (i = 0; i < edd_num_devices(); i++) {
 782                 if ((edev = edd_devices[i]))
 783                         edd_device_unregister(edev);
 784         }
 785         firmware_unregister(&edd_subsys);
 786 }
 787
 788 late_initcall(edd_init);
 789 module_exit(edd_exit);