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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  * @edev: target edd_device
 237  * @buf: output buffer
 238  *
 239  * Returns: number of bytes written, or -EINVAL on failure
 240  */
 241 static ssize_t
 242 edd_show_raw_data(struct edd_device *edev, char *buf)
 243 {
 244         struct edd_info *info;
 245         ssize_t len = sizeof (info->params);
 246         if (!edev)
 247                 return -EINVAL;
 248         info = edd_dev_get_info(edev);
 249         if (!info || !buf)
 250                 return -EINVAL;
 251
 252         if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
 253                 len = info->params.length;
 254
 255         /* In case of buggy BIOSs */
 256         if (len > (sizeof(info->params)))
 257                 len = sizeof(info->params);
 258
 259         memcpy(buf, &info->params, len);
 260         return len;
 261 }
 262
 263 static ssize_t
 264 edd_show_version(struct edd_device *edev, char *buf)
 265 {
 266         struct edd_info *info;
 267         char *p = buf;
 268         if (!edev)
 269                 return -EINVAL;
 270         info = edd_dev_get_info(edev);
 271         if (!info || !buf)
 272                 return -EINVAL;
 273
 274         p += scnprintf(p, left, "0x%02x\n", info->version);
 275         return (p - buf);
 276 }
 277
 278 static ssize_t
 279 edd_show_mbr_signature(struct edd_device *edev, char *buf)
 280 {
 281         char *p = buf;
 282         p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
 283         return (p - buf);
 284 }
 285
 286 static ssize_t
 287 edd_show_extensions(struct edd_device *edev, char *buf)
 288 {
 289         struct edd_info *info;
 290         char *p = buf;
 291         if (!edev)
 292                 return -EINVAL;
 293         info = edd_dev_get_info(edev);
 294         if (!info || !buf)
 295                 return -EINVAL;
 296
 297         if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
 298                 p += scnprintf(p, left, "Fixed disk access\n");
 299         }
 300         if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
 301                 p += scnprintf(p, left, "Device locking and ejecting\n");
 302         }
 303         if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
 304                 p += scnprintf(p, left, "Enhanced Disk Drive support\n");
 305         }
 306         if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
 307                 p += scnprintf(p, left, "64-bit extensions\n");
 308         }
 309         return (p - buf);
 310 }
 311
 312 static ssize_t
 313 edd_show_info_flags(struct edd_device *edev, char *buf)
 314 {
 315         struct edd_info *info;
 316         char *p = buf;
 317         if (!edev)
 318                 return -EINVAL;
 319         info = edd_dev_get_info(edev);
 320         if (!info || !buf)
 321                 return -EINVAL;
 322
 323         if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
 324                 p += scnprintf(p, left, "DMA boundary error transparent\n");
 325         if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
 326                 p += scnprintf(p, left, "geometry valid\n");
 327         if (info->params.info_flags & EDD_INFO_REMOVABLE)
 328                 p += scnprintf(p, left, "removable\n");
 329         if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
 330                 p += scnprintf(p, left, "write verify\n");
 331         if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
 332                 p += scnprintf(p, left, "media change notification\n");
 333         if (info->params.info_flags & EDD_INFO_LOCKABLE)
 334                 p += scnprintf(p, left, "lockable\n");
 335         if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
 336                 p += scnprintf(p, left, "no media present\n");
 337         if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
 338                 p += scnprintf(p, left, "use int13 fn50\n");
 339         return (p - buf);
 340 }
 341
 342 static ssize_t
 343 edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
 344 {
 345         struct edd_info *info;
 346         char *p = buf;
 347         if (!edev)
 348                 return -EINVAL;
 349         info = edd_dev_get_info(edev);
 350         if (!info || !buf)
 351                 return -EINVAL;
 352
 353         p += snprintf(p, left, "%u\n", info->legacy_max_cylinder);
 354         return (p - buf);
 355 }
 356
 357 static ssize_t
 358 edd_show_legacy_max_head(struct edd_device *edev, char *buf)
 359 {
 360         struct edd_info *info;
 361         char *p = buf;
 362         if (!edev)
 363                 return -EINVAL;
 364         info = edd_dev_get_info(edev);
 365         if (!info || !buf)
 366                 return -EINVAL;
 367
 368         p += snprintf(p, left, "%u\n", info->legacy_max_head);
 369         return (p - buf);
 370 }
 371
 372 static ssize_t
 373 edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
 374 {
 375         struct edd_info *info;
 376         char *p = buf;
 377         if (!edev)
 378                 return -EINVAL;
 379         info = edd_dev_get_info(edev);
 380         if (!info || !buf)
 381                 return -EINVAL;
 382
 383         p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);
 384         return (p - buf);
 385 }
 386
 387 static ssize_t
 388 edd_show_default_cylinders(struct edd_device *edev, char *buf)
 389 {
 390         struct edd_info *info;
 391         char *p = buf;
 392         if (!edev)
 393                 return -EINVAL;
 394         info = edd_dev_get_info(edev);
 395         if (!info || !buf)
 396                 return -EINVAL;
 397
 398         p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
 399         return (p - buf);
 400 }
 401
 402 static ssize_t
 403 edd_show_default_heads(struct edd_device *edev, char *buf)
 404 {
 405         struct edd_info *info;
 406         char *p = buf;
 407         if (!edev)
 408                 return -EINVAL;
 409         info = edd_dev_get_info(edev);
 410         if (!info || !buf)
 411                 return -EINVAL;
 412
 413         p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
 414         return (p - buf);
 415 }
 416
 417 static ssize_t
 418 edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
 419 {
 420         struct edd_info *info;
 421         char *p = buf;
 422         if (!edev)
 423                 return -EINVAL;
 424         info = edd_dev_get_info(edev);
 425         if (!info || !buf)
 426                 return -EINVAL;
 427
 428         p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
 429         return (p - buf);
 430 }
 431
 432 static ssize_t
 433 edd_show_sectors(struct edd_device *edev, char *buf)
 434 {
 435         struct edd_info *info;
 436         char *p = buf;
 437         if (!edev)
 438                 return -EINVAL;
 439         info = edd_dev_get_info(edev);
 440         if (!info || !buf)
 441                 return -EINVAL;
 442
 443         p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
 444         return (p - buf);
 445 }
 446
 447
 448 /*
 449  * Some device instances may not have all the above attributes,
 450  * or the attribute values may be meaningless (i.e. if
 451  * the device is < EDD 3.0, it won't have host_bus and interface
 452  * information), so don't bother making files for them.  Likewise
 453  * if the default_{cylinders,heads,sectors_per_track} values
 454  * are zero, the BIOS doesn't provide sane values, don't bother
 455  * creating files for them either.
 456  */
 457
 458 static int
 459 edd_has_legacy_max_cylinder(struct edd_device *edev)
 460 {
 461         struct edd_info *info;
 462         if (!edev)
 463                 return 0;
 464         info = edd_dev_get_info(edev);
 465         if (!info)
 466                 return 0;
 467         return info->legacy_max_cylinder > 0;
 468 }
 469
 470 static int
 471 edd_has_legacy_max_head(struct edd_device *edev)
 472 {
 473         struct edd_info *info;
 474         if (!edev)
 475                 return 0;
 476         info = edd_dev_get_info(edev);
 477         if (!info)
 478                 return 0;
 479         return info->legacy_max_head > 0;
 480 }
 481
 482 static int
 483 edd_has_legacy_sectors_per_track(struct edd_device *edev)
 484 {
 485         struct edd_info *info;
 486         if (!edev)
 487                 return 0;
 488         info = edd_dev_get_info(edev);
 489         if (!info)
 490                 return 0;
 491         return info->legacy_sectors_per_track > 0;
 492 }
 493
 494 static int
 495 edd_has_default_cylinders(struct edd_device *edev)
 496 {
 497         struct edd_info *info;
 498         if (!edev)
 499                 return 0;
 500         info = edd_dev_get_info(edev);
 501         if (!info)
 502                 return 0;
 503         return info->params.num_default_cylinders > 0;
 504 }
 505
 506 static int
 507 edd_has_default_heads(struct edd_device *edev)
 508 {
 509         struct edd_info *info;
 510         if (!edev)
 511                 return 0;
 512         info = edd_dev_get_info(edev);
 513         if (!info)
 514                 return 0;
 515         return info->params.num_default_heads > 0;
 516 }
 517
 518 static int
 519 edd_has_default_sectors_per_track(struct edd_device *edev)
 520 {
 521         struct edd_info *info;
 522         if (!edev)
 523                 return 0;
 524         info = edd_dev_get_info(edev);
 525         if (!info)
 526                 return 0;
 527         return info->params.sectors_per_track > 0;
 528 }
 529
 530 static int
 531 edd_has_edd30(struct edd_device *edev)
 532 {
 533         struct edd_info *info;
 534         int i, 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
 562 static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
 563 static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
 564 static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
 565 static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
 566 static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
 567 static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
 568                        edd_show_legacy_max_cylinder,
 569                        edd_has_legacy_max_cylinder);
 570 static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
 571                        edd_has_legacy_max_head);
 572 static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
 573                        edd_show_legacy_sectors_per_track,
 574                        edd_has_legacy_sectors_per_track);
 575 static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
 576                        edd_has_default_cylinders);
 577 static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
 578                        edd_has_default_heads);
 579 static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
 580                        edd_show_default_sectors_per_track,
 581                        edd_has_default_sectors_per_track);
 582 static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
 583 static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
 584 static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
 585
 586
 587 /* These are default attributes that are added for every edd
 588  * device discovered.  There are none.
 589  */
 590 static struct attribute * def_attrs[] = {
 591         NULL,
 592 };
 593
 594 /* These attributes are conditional and only added for some devices. */
 595 static struct edd_attribute * edd_attrs[] = {
 596         &edd_attr_raw_data,
 597         &edd_attr_version,
 598         &edd_attr_extensions,
 599         &edd_attr_info_flags,
 600         &edd_attr_sectors,
 601         &edd_attr_legacy_max_cylinder,
 602         &edd_attr_legacy_max_head,
 603         &edd_attr_legacy_sectors_per_track,
 604         &edd_attr_default_cylinders,
 605         &edd_attr_default_heads,
 606         &edd_attr_default_sectors_per_track,
 607         &edd_attr_interface,
 608         &edd_attr_host_bus,
 609         &edd_attr_mbr_signature,
 610         NULL,
 611 };
 612
 613 /**
 614  *      edd_release - free edd structure
 615  *      @kobj:  kobject of edd structure
 616  *
 617  *      This is called when the refcount of the edd structure
 618  *      reaches 0. This should happen right after we unregister,
 619  *      but just in case, we use the release callback anyway.
 620  */
 621
 622 static void edd_release(struct kobject * kobj)
 623 {
 624         struct edd_device * dev = to_edd_device(kobj);
 625         kfree(dev);
 626 }
 627
 628 static struct kobj_type ktype_edd = {
 629         .release        = edd_release,
 630         .sysfs_ops      = &edd_attr_ops,
 631         .default_attrs  = def_attrs,
 632 };
 633
 634 static decl_subsys(edd,&ktype_edd,NULL);
 635
 636
 637 /**
 638  * edd_dev_is_type() - is this EDD device a 'type' device?
 639  * @edev: target edd_device
 640  * @type: a host bus or interface identifier string per the EDD spec
 641  *
 642  * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
 643  */
 644 static int
 645 edd_dev_is_type(struct edd_device *edev, const char *type)
 646 {
 647         struct edd_info *info;
 648         if (!edev)
 649                 return 0;
 650         info = edd_dev_get_info(edev);
 651
 652         if (type && info) {
 653                 if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||
 654                     !strncmp(info->params.interface_type, type, strlen(type)))
 655                         return 1;
 656         }
 657         return 0;
 658 }
 659
 660 /**
 661  * edd_get_pci_dev() - finds pci_dev that matches edev
 662  * @edev: edd_device
 663  *
 664  * Returns pci_dev if found, or NULL
 665  */
 666 static struct pci_dev *
 667 edd_get_pci_dev(struct edd_device *edev)
 668 {
 669         struct edd_info *info = edd_dev_get_info(edev);
 670
 671         if (edd_dev_is_type(edev, "PCI")) {
 672                 return pci_find_slot(info->params.interface_path.pci.bus,
 673                                      PCI_DEVFN(info->params.interface_path.pci.slot,
 674                                                info->params.interface_path.pci.
 675                                                function));
 676         }
 677         return NULL;
 678 }
 679
 680 static int
 681 edd_create_symlink_to_pcidev(struct edd_device *edev)
 682 {
 683
 684         struct pci_dev *pci_dev = edd_get_pci_dev(edev);
 685         if (!pci_dev)
 686                 return 1;
 687         return sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
 688 }
 689
 690 static inline void
 691 edd_device_unregister(struct edd_device *edev)
 692 {
 693         kobject_unregister(&edev->kobj);
 694 }
 695
 696 static void edd_populate_dir(struct edd_device * edev)
 697 {
 698         struct edd_attribute * attr;
 699         int error = 0;
 700         int i;
 701
 702         for (i = 0; (attr = edd_attrs[i]) && !error; i++) {
 703                 if (!attr->test ||
 704                     (attr->test && attr->test(edev)))
 705                         error = sysfs_create_file(&edev->kobj,&attr->attr);
 706         }
 707
 708         if (!error) {
 709                 edd_create_symlink_to_pcidev(edev);
 710         }
 711 }
 712
 713 static int
 714 edd_device_register(struct edd_device *edev, int i)
 715 {
 716         int error;
 717
 718         if (!edev)
 719                 return 1;
 720         edd_dev_set_info(edev, i);
 721         kobject_set_name(&edev->kobj, "int13_dev%02x",
 722                          0x80 + i);
 723         kobj_set_kset_s(edev,edd_subsys);
 724         error = kobject_register(&edev->kobj);
 725         if (!error)
 726                 edd_populate_dir(edev);
 727         return error;
 728 }
 729
 730 static inline int edd_num_devices(void)
 731 {
 732         return max_t(unsigned char,
 733                      min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),
 734                      min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));
 735 }
 736
 737 /**
 738  * edd_init() - creates sysfs tree of EDD data
 739  */
 740 static int __init
 741 edd_init(void)
 742 {
 743         unsigned int i;
 744         int rc=0;
 745         struct edd_device *edev;
 746
 747         printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n",
 748                EDD_VERSION, EDD_DATE, edd_num_devices());
 749
 750         if (!edd_num_devices()) {
 751                 printk(KERN_INFO "EDD information not available.\n");
 752                 return 1;
 753         }
 754
 755         rc = firmware_register(&edd_subsys);
 756         if (rc)
 757                 return rc;
 758
 759         for (i = 0; i < edd_num_devices() && !rc; i++) {
 760                 edev = kzalloc(sizeof (*edev), GFP_KERNEL);
 761                 if (!edev)
 762                         return -ENOMEM;
 763
 764                 rc = edd_device_register(edev, i);
 765                 if (rc) {
 766                         kfree(edev);
 767                         break;
 768                 }
 769                 edd_devices[i] = edev;
 770         }
 771
 772         if (rc)
 773                 firmware_unregister(&edd_subsys);
 774         return rc;
 775 }
 776
 777 static void __exit
 778 edd_exit(void)
 779 {
 780         int i;
 781         struct edd_device *edev;
 782
 783         for (i = 0; i < edd_num_devices(); i++) {
 784                 if ((edev = edd_devices[i]))
 785                         edd_device_unregister(edev);
 786         }
 787         firmware_unregister(&edd_subsys);
 788 }
 789
 790 late_initcall(edd_init);
 791 module_exit(edd_exit);