disk/part.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #include <common.h>
   8 #include <command.h>
   9 #include <env.h>
  10 #include <errno.h>
  11 #include <ide.h>
  12 #include <malloc.h>
  13 #include <part.h>
  14 #include <ubifs_uboot.h>
  15
  16 #undef  PART_DEBUG
  17
  18 #ifdef  PART_DEBUG
  19 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  20 #else
  21 #define PRINTF(fmt,args...)
  22 #endif
  23
  24 /* Check all partition types */
  25 #define PART_TYPE_ALL           -1
  26
  27 static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
  28 {
  29         struct part_driver *drv =
  30                 ll_entry_start(struct part_driver, part_driver);
  31         const int n_ents = ll_entry_count(struct part_driver, part_driver);
  32         struct part_driver *entry;
  33
  34         if (dev_desc->part_type == PART_TYPE_UNKNOWN) {
  35                 for (entry = drv; entry != drv + n_ents; entry++) {
  36                         int ret;
  37
  38                         ret = entry->test(dev_desc);
  39                         if (!ret) {
  40                                 dev_desc->part_type = entry->part_type;
  41                                 return entry;
  42                         }
  43                 }
  44         } else {
  45                 for (entry = drv; entry != drv + n_ents; entry++) {
  46                         if (dev_desc->part_type == entry->part_type)
  47                                 return entry;
  48                 }
  49         }
  50
  51         /* Not found */
  52         return NULL;
  53 }
  54
  55 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  56 static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  57 {
  58         struct blk_desc *dev_desc;
  59         int ret;
  60
  61         dev_desc = blk_get_devnum_by_typename(ifname, dev);
  62         if (!dev_desc) {
  63                 debug("%s: No device for iface '%s', dev %d\n", __func__,
  64                       ifname, dev);
  65                 return NULL;
  66         }
  67         ret = blk_dselect_hwpart(dev_desc, hwpart);
  68         if (ret) {
  69                 debug("%s: Failed to select h/w partition: err-%d\n", __func__,
  70                       ret);
  71                 return NULL;
  72         }
  73
  74         return dev_desc;
  75 }
  76
  77 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  78 {
  79         return get_dev_hwpart(ifname, dev, 0);
  80 }
  81 #else
  82 struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  83 {
  84         return NULL;
  85 }
  86
  87 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  88 {
  89         return NULL;
  90 }
  91 #endif
  92
  93 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  94
  95 /* ------------------------------------------------------------------------- */
  96 /*
  97  * reports device info to the user
  98  */
  99
 100 #ifdef CONFIG_LBA48
 101 typedef uint64_t lba512_t;
 102 #else
 103 typedef lbaint_t lba512_t;
 104 #endif
 105
 106 /*
 107  * Overflowless variant of (block_count * mul_by / 2**div_by)
 108  * when div_by > mul_by
 109  */
 110 static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by, int div_by)
 111 {
 112         lba512_t bc_quot, bc_rem;
 113
 114         /* x * m / d == x / d * m + (x % d) * m / d */
 115         bc_quot = block_count >> div_by;
 116         bc_rem  = block_count - (bc_quot << div_by);
 117         return bc_quot * mul_by + ((bc_rem * mul_by) >> div_by);
 118 }
 119
 120 void dev_print (struct blk_desc *dev_desc)
 121 {
 122         lba512_t lba512; /* number of blocks if 512bytes block size */
 123
 124         if (dev_desc->type == DEV_TYPE_UNKNOWN) {
 125                 puts ("not available\n");
 126                 return;
 127         }
 128
 129         switch (dev_desc->if_type) {
 130         case IF_TYPE_SCSI:
 131                 printf ("(%d:%d) Vendor: %s Prod.: %s Rev: %s\n",
 132                         dev_desc->target,dev_desc->lun,
 133                         dev_desc->vendor,
 134                         dev_desc->product,
 135                         dev_desc->revision);
 136                 break;
 137         case IF_TYPE_ATAPI:
 138         case IF_TYPE_IDE:
 139         case IF_TYPE_SATA:
 140                 printf ("Model: %s Firm: %s Ser#: %s\n",
 141                         dev_desc->vendor,
 142                         dev_desc->revision,
 143                         dev_desc->product);
 144                 break;
 145         case IF_TYPE_SD:
 146         case IF_TYPE_MMC:
 147         case IF_TYPE_USB:
 148         case IF_TYPE_NVME:
 149                 printf ("Vendor: %s Rev: %s Prod: %s\n",
 150                         dev_desc->vendor,
 151                         dev_desc->revision,
 152                         dev_desc->product);
 153                 break;
 154         case IF_TYPE_VIRTIO:
 155                 printf("%s VirtIO Block Device\n", dev_desc->vendor);
 156                 break;
 157         case IF_TYPE_DOC:
 158                 puts("device type DOC\n");
 159                 return;
 160         case IF_TYPE_UNKNOWN:
 161                 puts("device type unknown\n");
 162                 return;
 163         default:
 164                 printf("Unhandled device type: %i\n", dev_desc->if_type);
 165                 return;
 166         }
 167         puts ("            Type: ");
 168         if (dev_desc->removable)
 169                 puts ("Removable ");
 170         switch (dev_desc->type & 0x1F) {
 171         case DEV_TYPE_HARDDISK:
 172                 puts ("Hard Disk");
 173                 break;
 174         case DEV_TYPE_CDROM:
 175                 puts ("CD ROM");
 176                 break;
 177         case DEV_TYPE_OPDISK:
 178                 puts ("Optical Device");
 179                 break;
 180         case DEV_TYPE_TAPE:
 181                 puts ("Tape");
 182                 break;
 183         default:
 184                 printf ("# %02X #", dev_desc->type & 0x1F);
 185                 break;
 186         }
 187         puts ("\n");
 188         if (dev_desc->lba > 0L && dev_desc->blksz > 0L) {
 189                 ulong mb, mb_quot, mb_rem, gb, gb_quot, gb_rem;
 190                 lbaint_t lba;
 191
 192                 lba = dev_desc->lba;
 193
 194                 lba512 = (lba * (dev_desc->blksz/512));
 195                 /* round to 1 digit */
 196                 /* 2048 = (1024 * 1024) / 512 MB */
 197                 mb = lba512_muldiv(lba512, 10, 11);
 198
 199                 mb_quot = mb / 10;
 200                 mb_rem  = mb - (10 * mb_quot);
 201
 202                 gb = mb / 1024;
 203                 gb_quot = gb / 10;
 204                 gb_rem  = gb - (10 * gb_quot);
 205 #ifdef CONFIG_LBA48
 206                 if (dev_desc->lba48)
 207                         printf ("            Supports 48-bit addressing\n");
 208 #endif
 209 #if defined(CONFIG_SYS_64BIT_LBA)
 210                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%llu x %lu)\n",
 211                         mb_quot, mb_rem,
 212                         gb_quot, gb_rem,
 213                         lba,
 214                         dev_desc->blksz);
 215 #else
 216                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%lu x %lu)\n",
 217                         mb_quot, mb_rem,
 218                         gb_quot, gb_rem,
 219                         (ulong)lba,
 220                         dev_desc->blksz);
 221 #endif
 222         } else {
 223                 puts ("            Capacity: not available\n");
 224         }
 225 }
 226 #endif
 227
 228 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 229
 230 void part_init(struct blk_desc *dev_desc)
 231 {
 232         struct part_driver *drv =
 233                 ll_entry_start(struct part_driver, part_driver);
 234         const int n_ents = ll_entry_count(struct part_driver, part_driver);
 235         struct part_driver *entry;
 236
 237         blkcache_invalidate(dev_desc->if_type, dev_desc->devnum);
 238
 239         dev_desc->part_type = PART_TYPE_UNKNOWN;
 240         for (entry = drv; entry != drv + n_ents; entry++) {
 241                 int ret;
 242
 243                 ret = entry->test(dev_desc);
 244                 debug("%s: try '%s': ret=%d\n", __func__, entry->name, ret);
 245                 if (!ret) {
 246                         dev_desc->part_type = entry->part_type;
 247                         break;
 248                 }
 249         }
 250 }
 251
 252 static void print_part_header(const char *type, struct blk_desc *dev_desc)
 253 {
 254 #if CONFIG_IS_ENABLED(MAC_PARTITION) || \
 255         CONFIG_IS_ENABLED(DOS_PARTITION) || \
 256         CONFIG_IS_ENABLED(ISO_PARTITION) || \
 257         CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
 258         CONFIG_IS_ENABLED(EFI_PARTITION)
 259         puts ("\nPartition Map for ");
 260         switch (dev_desc->if_type) {
 261         case IF_TYPE_IDE:
 262                 puts ("IDE");
 263                 break;
 264         case IF_TYPE_SATA:
 265                 puts ("SATA");
 266                 break;
 267         case IF_TYPE_SCSI:
 268                 puts ("SCSI");
 269                 break;
 270         case IF_TYPE_ATAPI:
 271                 puts ("ATAPI");
 272                 break;
 273         case IF_TYPE_USB:
 274                 puts ("USB");
 275                 break;
 276         case IF_TYPE_DOC:
 277                 puts ("DOC");
 278                 break;
 279         case IF_TYPE_MMC:
 280                 puts ("MMC");
 281                 break;
 282         case IF_TYPE_HOST:
 283                 puts ("HOST");
 284                 break;
 285         case IF_TYPE_NVME:
 286                 puts ("NVMe");
 287                 break;
 288         case IF_TYPE_VIRTIO:
 289                 puts("VirtIO");
 290                 break;
 291         default:
 292                 puts ("UNKNOWN");
 293                 break;
 294         }
 295         printf (" device %d  --   Partition Type: %s\n\n",
 296                         dev_desc->devnum, type);
 297 #endif /* any CONFIG_..._PARTITION */
 298 }
 299
 300 void part_print(struct blk_desc *dev_desc)
 301 {
 302         struct part_driver *drv;
 303
 304         drv = part_driver_lookup_type(dev_desc);
 305         if (!drv) {
 306                 printf("## Unknown partition table type %x\n",
 307                        dev_desc->part_type);
 308                 return;
 309         }
 310
 311         PRINTF("## Testing for valid %s partition ##\n", drv->name);
 312         print_part_header(drv->name, dev_desc);
 313         if (drv->print)
 314                 drv->print(dev_desc);
 315 }
 316
 317 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
 318
 319 int part_get_info(struct blk_desc *dev_desc, int part,
 320                        disk_partition_t *info)
 321 {
 322 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 323         struct part_driver *drv;
 324
 325 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 326         /* The common case is no UUID support */
 327         info->uuid[0] = 0;
 328 #endif
 329 #ifdef CONFIG_PARTITION_TYPE_GUID
 330         info->type_guid[0] = 0;
 331 #endif
 332
 333         drv = part_driver_lookup_type(dev_desc);
 334         if (!drv) {
 335                 debug("## Unknown partition table type %x\n",
 336                       dev_desc->part_type);
 337                 return -EPROTONOSUPPORT;
 338         }
 339         if (!drv->get_info) {
 340                 PRINTF("## Driver %s does not have the get_info() method\n",
 341                        drv->name);
 342                 return -ENOSYS;
 343         }
 344         if (drv->get_info(dev_desc, part, info) == 0) {
 345                 PRINTF("## Valid %s partition found ##\n", drv->name);
 346                 return 0;
 347         }
 348 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
 349
 350         return -1;
 351 }
 352
 353 int part_get_info_whole_disk(struct blk_desc *dev_desc, disk_partition_t *info)
 354 {
 355         info->start = 0;
 356         info->size = dev_desc->lba;
 357         info->blksz = dev_desc->blksz;
 358         info->bootable = 0;
 359         strcpy((char *)info->type, BOOT_PART_TYPE);
 360         strcpy((char *)info->name, "Whole Disk");
 361 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 362         info->uuid[0] = 0;
 363 #endif
 364 #ifdef CONFIG_PARTITION_TYPE_GUID
 365         info->type_guid[0] = 0;
 366 #endif
 367
 368         return 0;
 369 }
 370
 371 int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str,
 372                           struct blk_desc **dev_desc)
 373 {
 374         char *ep;
 375         char *dup_str = NULL;
 376         const char *dev_str, *hwpart_str;
 377         int dev, hwpart;
 378
 379         hwpart_str = strchr(dev_hwpart_str, '.');
 380         if (hwpart_str) {
 381                 dup_str = strdup(dev_hwpart_str);
 382                 dup_str[hwpart_str - dev_hwpart_str] = 0;
 383                 dev_str = dup_str;
 384                 hwpart_str++;
 385         } else {
 386                 dev_str = dev_hwpart_str;
 387                 hwpart = 0;
 388         }
 389
 390         dev = simple_strtoul(dev_str, &ep, 16);
 391         if (*ep) {
 392                 printf("** Bad device specification %s %s **\n",
 393                        ifname, dev_str);
 394                 dev = -EINVAL;
 395                 goto cleanup;
 396         }
 397
 398         if (hwpart_str) {
 399                 hwpart = simple_strtoul(hwpart_str, &ep, 16);
 400                 if (*ep) {
 401                         printf("** Bad HW partition specification %s %s **\n",
 402                             ifname, hwpart_str);
 403                         dev = -EINVAL;
 404                         goto cleanup;
 405                 }
 406         }
 407
 408         *dev_desc = get_dev_hwpart(ifname, dev, hwpart);
 409         if (!(*dev_desc) || ((*dev_desc)->type == DEV_TYPE_UNKNOWN)) {
 410                 debug("** Bad device %s %s **\n", ifname, dev_hwpart_str);
 411                 dev = -ENOENT;
 412                 goto cleanup;
 413         }
 414
 415 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 416         /*
 417          * Updates the partition table for the specified hw partition.
 418          * Always should be done, otherwise hw partition 0 will return stale
 419          * data after displaying a non-zero hw partition.
 420          */
 421         part_init(*dev_desc);
 422 #endif
 423
 424 cleanup:
 425         free(dup_str);
 426         return dev;
 427 }
 428
 429 #define PART_UNSPECIFIED -2
 430 #define PART_AUTO -1
 431 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 432                              struct blk_desc **dev_desc,
 433                              disk_partition_t *info, int allow_whole_dev)
 434 {
 435         int ret = -1;
 436         const char *part_str;
 437         char *dup_str = NULL;
 438         const char *dev_str;
 439         int dev;
 440         char *ep;
 441         int p;
 442         int part;
 443         disk_partition_t tmpinfo;
 444
 445 #ifdef CONFIG_SANDBOX
 446         /*
 447          * Special-case a pseudo block device "hostfs", to allow access to the
 448          * host's own filesystem.
 449          */
 450         if (0 == strcmp(ifname, "hostfs")) {
 451                 *dev_desc = NULL;
 452                 info->start = 0;
 453                 info->size = 0;
 454                 info->blksz = 0;
 455                 info->bootable = 0;
 456                 strcpy((char *)info->type, BOOT_PART_TYPE);
 457                 strcpy((char *)info->name, "Sandbox host");
 458 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 459                 info->uuid[0] = 0;
 460 #endif
 461 #ifdef CONFIG_PARTITION_TYPE_GUID
 462                 info->type_guid[0] = 0;
 463 #endif
 464
 465                 return 0;
 466         }
 467 #endif
 468
 469 #ifdef CONFIG_CMD_UBIFS
 470         /*
 471          * Special-case ubi, ubi goes through a mtd, rather than through
 472          * a regular block device.
 473          */
 474         if (0 == strcmp(ifname, "ubi")) {
 475                 if (!ubifs_is_mounted()) {
 476                         printf("UBIFS not mounted, use ubifsmount to mount volume first!\n");
 477                         return -1;
 478                 }
 479
 480                 *dev_desc = NULL;
 481                 memset(info, 0, sizeof(*info));
 482                 strcpy((char *)info->type, BOOT_PART_TYPE);
 483                 strcpy((char *)info->name, "UBI");
 484 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 485                 info->uuid[0] = 0;
 486 #endif
 487                 return 0;
 488         }
 489 #endif
 490
 491         /* If no dev_part_str, use bootdevice environment variable */
 492         if (!dev_part_str || !strlen(dev_part_str) ||
 493             !strcmp(dev_part_str, "-"))
 494                 dev_part_str = env_get("bootdevice");
 495
 496         /* If still no dev_part_str, it's an error */
 497         if (!dev_part_str) {
 498                 printf("** No device specified **\n");
 499                 goto cleanup;
 500         }
 501
 502         /* Separate device and partition ID specification */
 503         part_str = strchr(dev_part_str, ':');
 504         if (part_str) {
 505                 dup_str = strdup(dev_part_str);
 506                 dup_str[part_str - dev_part_str] = 0;
 507                 dev_str = dup_str;
 508                 part_str++;
 509         } else {
 510                 dev_str = dev_part_str;
 511         }
 512
 513         /* Look up the device */
 514         dev = blk_get_device_by_str(ifname, dev_str, dev_desc);
 515         if (dev < 0)
 516                 goto cleanup;
 517
 518         /* Convert partition ID string to number */
 519         if (!part_str || !*part_str) {
 520                 part = PART_UNSPECIFIED;
 521         } else if (!strcmp(part_str, "auto")) {
 522                 part = PART_AUTO;
 523         } else {
 524                 /* Something specified -> use exactly that */
 525                 part = (int)simple_strtoul(part_str, &ep, 16);
 526                 /*
 527                  * Less than whole string converted,
 528                  * or request for whole device, but caller requires partition.
 529                  */
 530                 if (*ep || (part == 0 && !allow_whole_dev)) {
 531                         printf("** Bad partition specification %s %s **\n",
 532                             ifname, dev_part_str);
 533                         goto cleanup;
 534                 }
 535         }
 536
 537         /*
 538          * No partition table on device,
 539          * or user requested partition 0 (entire device).
 540          */
 541         if (((*dev_desc)->part_type == PART_TYPE_UNKNOWN) ||
 542             (part == 0)) {
 543                 if (!(*dev_desc)->lba) {
 544                         printf("** Bad device size - %s %s **\n", ifname,
 545                                dev_str);
 546                         goto cleanup;
 547                 }
 548
 549                 /*
 550                  * If user specified a partition ID other than 0,
 551                  * or the calling command only accepts partitions,
 552                  * it's an error.
 553                  */
 554                 if ((part > 0) || (!allow_whole_dev)) {
 555                         printf("** No partition table - %s %s **\n", ifname,
 556                                dev_str);
 557                         goto cleanup;
 558                 }
 559
 560                 (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 561
 562                 part_get_info_whole_disk(*dev_desc, info);
 563
 564                 ret = 0;
 565                 goto cleanup;
 566         }
 567
 568         /*
 569          * Now there's known to be a partition table,
 570          * not specifying a partition means to pick partition 1.
 571          */
 572         if (part == PART_UNSPECIFIED)
 573                 part = 1;
 574
 575         /*
 576          * If user didn't specify a partition number, or did specify something
 577          * other than "auto", use that partition number directly.
 578          */
 579         if (part != PART_AUTO) {
 580                 ret = part_get_info(*dev_desc, part, info);
 581                 if (ret) {
 582                         printf("** Invalid partition %d **\n", part);
 583                         goto cleanup;
 584                 }
 585         } else {
 586                 /*
 587                  * Find the first bootable partition.
 588                  * If none are bootable, fall back to the first valid partition.
 589                  */
 590                 part = 0;
 591                 for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
 592                         ret = part_get_info(*dev_desc, p, info);
 593                         if (ret)
 594                                 continue;
 595
 596                         /*
 597                          * First valid partition, or new better partition?
 598                          * If so, save partition ID.
 599                          */
 600                         if (!part || info->bootable)
 601                                 part = p;
 602
 603                         /* Best possible partition? Stop searching. */
 604                         if (info->bootable)
 605                                 break;
 606
 607                         /*
 608                          * We now need to search further for best possible.
 609                          * If we what we just queried was the best so far,
 610                          * save the info since we over-write it next loop.
 611                          */
 612                         if (part == p)
 613                                 tmpinfo = *info;
 614                 }
 615                 /* If we found any acceptable partition */
 616                 if (part) {
 617                         /*
 618                          * If we searched all possible partition IDs,
 619                          * return the first valid partition we found.
 620                          */
 621                         if (p == MAX_SEARCH_PARTITIONS + 1)
 622                                 *info = tmpinfo;
 623                 } else {
 624                         printf("** No valid partitions found **\n");
 625                         ret = -1;
 626                         goto cleanup;
 627                 }
 628         }
 629         if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
 630                 printf("** Invalid partition type \"%.32s\""
 631                         " (expect \"" BOOT_PART_TYPE "\")\n",
 632                         info->type);
 633                 ret  = -1;
 634                 goto cleanup;
 635         }
 636
 637         (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 638
 639         ret = part;
 640         goto cleanup;
 641
 642 cleanup:
 643         free(dup_str);
 644         return ret;
 645 }
 646
 647 int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
 648                                disk_partition_t *info, int part_type)
 649 {
 650         struct part_driver *part_drv;
 651         int ret;
 652         int i;
 653
 654         part_drv = part_driver_lookup_type(dev_desc);
 655         if (!part_drv)
 656                 return -1;
 657         for (i = 1; i < part_drv->max_entries; i++) {
 658                 ret = part_drv->get_info(dev_desc, i, info);
 659                 if (ret != 0) {
 660                         /* no more entries in table */
 661                         break;
 662                 }
 663                 if (strcmp(name, (const char *)info->name) == 0) {
 664                         /* matched */
 665                         return i;
 666                 }
 667         }
 668
 669         return -1;
 670 }
 671
 672 int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
 673                           disk_partition_t *info)
 674 {
 675         return part_get_info_by_name_type(dev_desc, name, info, PART_TYPE_ALL);
 676 }
 677
 678 /**
 679  * Get partition info from device number and partition name.
 680  *
 681  * Parse a device number and partition name string in the form of
 682  * "device_num#partition_name", for example "0#misc". If the partition
 683  * is found, sets dev_desc and part_info accordingly with the information
 684  * of the partition with the given partition_name.
 685  *
 686  * @param[in] dev_iface Device interface
 687  * @param[in] dev_part_str Input string argument, like "0#misc"
 688  * @param[out] dev_desc Place to store the device description pointer
 689  * @param[out] part_info Place to store the partition information
 690  * @return 0 on success, or a negative on error
 691  */
 692 static int part_get_info_by_dev_and_name(const char *dev_iface,
 693                                          const char *dev_part_str,
 694                                          struct blk_desc **dev_desc,
 695                                          disk_partition_t *part_info)
 696 {
 697         char *ep;
 698         const char *part_str;
 699         int dev_num;
 700
 701         part_str = strchr(dev_part_str, '#');
 702         if (!part_str || part_str == dev_part_str)
 703                 return -EINVAL;
 704
 705         dev_num = simple_strtoul(dev_part_str, &ep, 16);
 706         if (ep != part_str) {
 707                 /* Not all the first part before the # was parsed. */
 708                 return -EINVAL;
 709         }
 710         part_str++;
 711
 712         *dev_desc = blk_get_dev(dev_iface, dev_num);
 713         if (!*dev_desc) {
 714                 printf("Could not find %s %d\n", dev_iface, dev_num);
 715                 return -EINVAL;
 716         }
 717         if (part_get_info_by_name(*dev_desc, part_str, part_info) < 0) {
 718                 printf("Could not find \"%s\" partition\n", part_str);
 719                 return -EINVAL;
 720         }
 721         return 0;
 722 }
 723
 724 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 725                                          const char *dev_part_str,
 726                                          struct blk_desc **dev_desc,
 727                                          disk_partition_t *part_info)
 728 {
 729         /* Split the part_name if passed as "$dev_num#part_name". */
 730         if (!part_get_info_by_dev_and_name(dev_iface, dev_part_str,
 731                                            dev_desc, part_info))
 732                 return 0;
 733         /*
 734          * Couldn't lookup by name, try looking up the partition description
 735          * directly.
 736          */
 737         if (blk_get_device_part_str(dev_iface, dev_part_str,
 738                                     dev_desc, part_info, 1) < 0) {
 739                 printf("Couldn't find partition %s %s\n",
 740                        dev_iface, dev_part_str);
 741                 return -EINVAL;
 742         }
 743         return 0;
 744 }
 745
 746 void part_set_generic_name(const struct blk_desc *dev_desc,
 747         int part_num, char *name)
 748 {
 749         char *devtype;
 750
 751         switch (dev_desc->if_type) {
 752         case IF_TYPE_IDE:
 753         case IF_TYPE_SATA:
 754         case IF_TYPE_ATAPI:
 755                 devtype = "hd";
 756                 break;
 757         case IF_TYPE_SCSI:
 758                 devtype = "sd";
 759                 break;
 760         case IF_TYPE_USB:
 761                 devtype = "usbd";
 762                 break;
 763         case IF_TYPE_DOC:
 764                 devtype = "docd";
 765                 break;
 766         case IF_TYPE_MMC:
 767         case IF_TYPE_SD:
 768                 devtype = "mmcsd";
 769                 break;
 770         default:
 771                 devtype = "xx";
 772                 break;
 773         }
 774
 775         sprintf(name, "%s%c%d", devtype, 'a' + dev_desc->devnum, part_num);
 776 }