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 40 MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); 41 MODULE_DESCRIPTION("sysfs interface to BIOS EDD information"); 42 MODULE_LICENSE("GPL"); 43 MODULE_VERSION(EDD_VERSION); 44 45 #define left (PAGE_SIZE - (p - buf) - 1) 46 47 struct edd_device { 48 unsigned int index; 49 unsigned int mbr_signature; 50 struct edd_info *info; 51 struct kobject kobj; 52 }; 53 54 struct 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 */ 61 static int edd_dev_is_type(struct edd_device *edev, const char *type); 62 static struct pci_dev *edd_get_pci_dev(struct edd_device *edev); 63 64 static struct edd_device *edd_devices[EDD_MBR_SIG_MAX]; 65 66 #define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \ 67 struct edd_attribute edd_attr_##_name = { \ 68 .attr = {.name = __stringify(_name), .mode = _mode }, \ 69 .show = _show, \ 70 .test = _test, \ 71 }; 72 73 static int 74 edd_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 79 static int 80 edd_has_edd_info(struct edd_device *edev) 81 { 82 return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR); 83 } 84 85 static inline struct edd_info * 86 edd_dev_get_info(struct edd_device *edev) 87 { 88 return edev->info; 89 } 90 91 static inline void 92 edd_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) 103 104 static ssize_t 105 edd_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 } 115 116 static const struct sysfs_ops edd_attr_ops = { 117 .show = edd_attr_show, 118 }; 119 120 static ssize_t 121 edd_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 } 165 166 static ssize_t 167 edd_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 */ 232 static ssize_t 233 edd_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 } 253 254 static ssize_t 255 edd_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 } 268 269 static ssize_t 270 edd_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 } 276 277 static ssize_t 278 edd_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 } 302 303 static ssize_t 304 edd_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 } 332 333 static ssize_t 334 edd_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 } 347 348 static ssize_t 349 edd_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 } 362 363 static ssize_t 364 edd_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 } 377 378 static ssize_t 379 edd_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 } 392 393 static ssize_t 394 edd_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 } 407 408 static ssize_t 409 edd_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 } 422 423 static ssize_t 424 edd_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 */ 448 449 static int 450 edd_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 } 460 461 static int 462 edd_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 } 472 473 static int 474 edd_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 } 484 485 static int 486 edd_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 } 496 497 static int 498 edd_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 } 508 509 static int 510 edd_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 } 520 521 static int 522 edd_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 } 551 552 553 static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info); 554 static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info); 555 static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info); 556 static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info); 557 static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info); 558 static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444, 559 edd_show_legacy_max_cylinder, 560 edd_has_legacy_max_cylinder); 561 static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head, 562 edd_has_legacy_max_head); 563 static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444, 564 edd_show_legacy_sectors_per_track, 565 edd_has_legacy_sectors_per_track); 566 static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders, 567 edd_has_default_cylinders); 568 static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads, 569 edd_has_default_heads); 570 static EDD_DEVICE_ATTR(default_sectors_per_track, 0444, 571 edd_show_default_sectors_per_track, 572 edd_has_default_sectors_per_track); 573 static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30); 574 static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30); 575 static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature); 576 577 /* These attributes are conditional and only added for some devices. */ 578 static struct edd_attribute * edd_attrs[] = { 579 &edd_attr_raw_data, 580 &edd_attr_version, 581 &edd_attr_extensions, 582 &edd_attr_info_flags, 583 &edd_attr_sectors, 584 &edd_attr_legacy_max_cylinder, 585 &edd_attr_legacy_max_head, 586 &edd_attr_legacy_sectors_per_track, 587 &edd_attr_default_cylinders, 588 &edd_attr_default_heads, 589 &edd_attr_default_sectors_per_track, 590 &edd_attr_interface, 591 &edd_attr_host_bus, 592 &edd_attr_mbr_signature, 593 NULL, 594 }; 595 596 /** 597 * edd_release - free edd structure 598 * @kobj: kobject of edd structure 599 * 600 * This is called when the refcount of the edd structure 601 * reaches 0. This should happen right after we unregister, 602 * but just in case, we use the release callback anyway. 603 */ 604 605 static void edd_release(struct kobject * kobj) 606 { 607 struct edd_device * dev = to_edd_device(kobj); 608 kfree(dev); 609 } 610 611 static struct kobj_type edd_ktype = { 612 .release = edd_release, 613 .sysfs_ops = &edd_attr_ops, 614 }; 615 616 static struct kset *edd_kset; 617 618 619 /** 620 * edd_dev_is_type() - is this EDD device a 'type' device? 621 * @edev: target edd_device 622 * @type: a host bus or interface identifier string per the EDD spec 623 * 624 * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise. 625 */ 626 static int 627 edd_dev_is_type(struct edd_device *edev, const char *type) 628 { 629 struct edd_info *info; 630 if (!edev) 631 return 0; 632 info = edd_dev_get_info(edev); 633 634 if (type && info) { 635 if (!strncmp(info->params.host_bus_type, type, strlen(type)) || 636 !strncmp(info->params.interface_type, type, strlen(type))) 637 return 1; 638 } 639 return 0; 640 } 641 642 /** 643 * edd_get_pci_dev() - finds pci_dev that matches edev 644 * @edev: edd_device 645 * 646 * Returns pci_dev if found, or NULL 647 */ 648 static struct pci_dev * 649 edd_get_pci_dev(struct edd_device *edev) 650 { 651 struct edd_info *info = edd_dev_get_info(edev); 652 653 if (edd_dev_is_type(edev, "PCI") || edd_dev_is_type(edev, "XPRS")) { 654 return pci_get_domain_bus_and_slot(0, 655 info->params.interface_path.pci.bus, 656 PCI_DEVFN(info->params.interface_path.pci.slot, 657 info->params.interface_path.pci.function)); 658 } 659 return NULL; 660 } 661 662 static int 663 edd_create_symlink_to_pcidev(struct edd_device *edev) 664 { 665 666 struct pci_dev *pci_dev = edd_get_pci_dev(edev); 667 int ret; 668 if (!pci_dev) 669 return 1; 670 ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev"); 671 pci_dev_put(pci_dev); 672 return ret; 673 } 674 675 static inline void 676 edd_device_unregister(struct edd_device *edev) 677 { 678 kobject_put(&edev->kobj); 679 } 680 681 static void edd_populate_dir(struct edd_device * edev) 682 { 683 struct edd_attribute * attr; 684 int error = 0; 685 int i; 686 687 for (i = 0; (attr = edd_attrs[i]) && !error; i++) { 688 if (!attr->test || attr->test(edev)) 689 error = sysfs_create_file(&edev->kobj,&attr->attr); 690 } 691 692 if (!error) { 693 edd_create_symlink_to_pcidev(edev); 694 } 695 } 696 697 static int 698 edd_device_register(struct edd_device *edev, int i) 699 { 700 int error; 701 702 if (!edev) 703 return 1; 704 edd_dev_set_info(edev, i); 705 edev->kobj.kset = edd_kset; 706 error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL, 707 "int13_dev%02x", 0x80 + i); 708 if (!error) { 709 edd_populate_dir(edev); 710 kobject_uevent(&edev->kobj, KOBJ_ADD); 711 } 712 return error; 713 } 714 715 static inline int edd_num_devices(void) 716 { 717 return max_t(unsigned char, 718 min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr), 719 min_t(unsigned char, EDDMAXNR, edd.edd_info_nr)); 720 } 721 722 /** 723 * edd_init() - creates sysfs tree of EDD data 724 */ 725 static int __init 726 edd_init(void) 727 { 728 int i; 729 int rc=0; 730 struct edd_device *edev; 731 732 if (!edd_num_devices()) 733 return -ENODEV; 734 735 printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n", 736 EDD_VERSION, EDD_DATE, edd_num_devices()); 737 738 edd_kset = kset_create_and_add("edd", NULL, firmware_kobj); 739 if (!edd_kset) 740 return -ENOMEM; 741 742 for (i = 0; i < edd_num_devices(); i++) { 743 edev = kzalloc(sizeof (*edev), GFP_KERNEL); 744 if (!edev) { 745 rc = -ENOMEM; 746 goto out; 747 } 748 749 rc = edd_device_register(edev, i); 750 if (rc) { 751 kfree(edev); 752 goto out; 753 } 754 edd_devices[i] = edev; 755 } 756 757 return 0; 758 759 out: 760 while (--i >= 0) 761 edd_device_unregister(edd_devices[i]); 762 kset_unregister(edd_kset); 763 return rc; 764 } 765 766 static void __exit 767 edd_exit(void) 768 { 769 int i; 770 struct edd_device *edev; 771 772 for (i = 0; i < edd_num_devices(); i++) { 773 if ((edev = edd_devices[i])) 774 edd_device_unregister(edev); 775 } 776 kset_unregister(edd_kset); 777 } 778 779 late_initcall(edd_init); 780 module_exit(edd_exit); 781