| 1 | #include <linux/types.h> |
| 2 | #include <linux/string.h> |
| 3 | #include <linux/init.h> |
| 4 | #include <linux/module.h> |
| 5 | #include <linux/dmi.h> |
| 6 | #include <linux/efi.h> |
| 7 | #include <linux/bootmem.h> |
| 8 | #include <linux/slab.h> |
| 9 | #include <asm/dmi.h> |
| 10 | |
| 11 | /* |
| 12 | * DMI stands for "Desktop Management Interface". It is part |
| 13 | * of and an antecedent to, SMBIOS, which stands for System |
| 14 | * Management BIOS. See further: http://www.dmtf.org/standards |
| 15 | */ |
| 16 | static char dmi_empty_string[] = " "; |
| 17 | |
| 18 | /* |
| 19 | * Catch too early calls to dmi_check_system(): |
| 20 | */ |
| 21 | static int dmi_initialized; |
| 22 | |
| 23 | static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s) |
| 24 | { |
| 25 | const u8 *bp = ((u8 *) dm) + dm->length; |
| 26 | |
| 27 | if (s) { |
| 28 | s--; |
| 29 | while (s > 0 && *bp) { |
| 30 | bp += strlen(bp) + 1; |
| 31 | s--; |
| 32 | } |
| 33 | |
| 34 | if (*bp != 0) { |
| 35 | size_t len = strlen(bp)+1; |
| 36 | size_t cmp_len = len > 8 ? 8 : len; |
| 37 | |
| 38 | if (!memcmp(bp, dmi_empty_string, cmp_len)) |
| 39 | return dmi_empty_string; |
| 40 | return bp; |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | return ""; |
| 45 | } |
| 46 | |
| 47 | static char * __init dmi_string(const struct dmi_header *dm, u8 s) |
| 48 | { |
| 49 | const char *bp = dmi_string_nosave(dm, s); |
| 50 | char *str; |
| 51 | size_t len; |
| 52 | |
| 53 | if (bp == dmi_empty_string) |
| 54 | return dmi_empty_string; |
| 55 | |
| 56 | len = strlen(bp) + 1; |
| 57 | str = dmi_alloc(len); |
| 58 | if (str != NULL) |
| 59 | strcpy(str, bp); |
| 60 | else |
| 61 | printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len); |
| 62 | |
| 63 | return str; |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * We have to be cautious here. We have seen BIOSes with DMI pointers |
| 68 | * pointing to completely the wrong place for example |
| 69 | */ |
| 70 | static void dmi_table(u8 *buf, int len, int num, |
| 71 | void (*decode)(const struct dmi_header *, void *), |
| 72 | void *private_data) |
| 73 | { |
| 74 | u8 *data = buf; |
| 75 | int i = 0; |
| 76 | |
| 77 | /* |
| 78 | * Stop when we see all the items the table claimed to have |
| 79 | * OR we run off the end of the table (also happens) |
| 80 | */ |
| 81 | while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) { |
| 82 | const struct dmi_header *dm = (const struct dmi_header *)data; |
| 83 | |
| 84 | /* |
| 85 | * We want to know the total length (formatted area and |
| 86 | * strings) before decoding to make sure we won't run off the |
| 87 | * table in dmi_decode or dmi_string |
| 88 | */ |
| 89 | data += dm->length; |
| 90 | while ((data - buf < len - 1) && (data[0] || data[1])) |
| 91 | data++; |
| 92 | if (data - buf < len - 1) |
| 93 | decode(dm, private_data); |
| 94 | data += 2; |
| 95 | i++; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | static u32 dmi_base; |
| 100 | static u16 dmi_len; |
| 101 | static u16 dmi_num; |
| 102 | |
| 103 | static int __init dmi_walk_early(void (*decode)(const struct dmi_header *, |
| 104 | void *)) |
| 105 | { |
| 106 | u8 *buf; |
| 107 | |
| 108 | buf = dmi_ioremap(dmi_base, dmi_len); |
| 109 | if (buf == NULL) |
| 110 | return -1; |
| 111 | |
| 112 | dmi_table(buf, dmi_len, dmi_num, decode, NULL); |
| 113 | |
| 114 | dmi_iounmap(buf, dmi_len); |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static int __init dmi_checksum(const u8 *buf) |
| 119 | { |
| 120 | u8 sum = 0; |
| 121 | int a; |
| 122 | |
| 123 | for (a = 0; a < 15; a++) |
| 124 | sum += buf[a]; |
| 125 | |
| 126 | return sum == 0; |
| 127 | } |
| 128 | |
| 129 | static char *dmi_ident[DMI_STRING_MAX]; |
| 130 | static LIST_HEAD(dmi_devices); |
| 131 | int dmi_available; |
| 132 | |
| 133 | /* |
| 134 | * Save a DMI string |
| 135 | */ |
| 136 | static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string) |
| 137 | { |
| 138 | const char *d = (const char*) dm; |
| 139 | char *p; |
| 140 | |
| 141 | if (dmi_ident[slot]) |
| 142 | return; |
| 143 | |
| 144 | p = dmi_string(dm, d[string]); |
| 145 | if (p == NULL) |
| 146 | return; |
| 147 | |
| 148 | dmi_ident[slot] = p; |
| 149 | } |
| 150 | |
| 151 | static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index) |
| 152 | { |
| 153 | const u8 *d = (u8*) dm + index; |
| 154 | char *s; |
| 155 | int is_ff = 1, is_00 = 1, i; |
| 156 | |
| 157 | if (dmi_ident[slot]) |
| 158 | return; |
| 159 | |
| 160 | for (i = 0; i < 16 && (is_ff || is_00); i++) { |
| 161 | if(d[i] != 0x00) is_ff = 0; |
| 162 | if(d[i] != 0xFF) is_00 = 0; |
| 163 | } |
| 164 | |
| 165 | if (is_ff || is_00) |
| 166 | return; |
| 167 | |
| 168 | s = dmi_alloc(16*2+4+1); |
| 169 | if (!s) |
| 170 | return; |
| 171 | |
| 172 | sprintf(s, |
| 173 | "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", |
| 174 | d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], |
| 175 | d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]); |
| 176 | |
| 177 | dmi_ident[slot] = s; |
| 178 | } |
| 179 | |
| 180 | static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index) |
| 181 | { |
| 182 | const u8 *d = (u8*) dm + index; |
| 183 | char *s; |
| 184 | |
| 185 | if (dmi_ident[slot]) |
| 186 | return; |
| 187 | |
| 188 | s = dmi_alloc(4); |
| 189 | if (!s) |
| 190 | return; |
| 191 | |
| 192 | sprintf(s, "%u", *d & 0x7F); |
| 193 | dmi_ident[slot] = s; |
| 194 | } |
| 195 | |
| 196 | static void __init dmi_save_one_device(int type, const char *name) |
| 197 | { |
| 198 | struct dmi_device *dev; |
| 199 | |
| 200 | /* No duplicate device */ |
| 201 | if (dmi_find_device(type, name, NULL)) |
| 202 | return; |
| 203 | |
| 204 | dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1); |
| 205 | if (!dev) { |
| 206 | printk(KERN_ERR "dmi_save_one_device: out of memory.\n"); |
| 207 | return; |
| 208 | } |
| 209 | |
| 210 | dev->type = type; |
| 211 | strcpy((char *)(dev + 1), name); |
| 212 | dev->name = (char *)(dev + 1); |
| 213 | dev->device_data = NULL; |
| 214 | list_add(&dev->list, &dmi_devices); |
| 215 | } |
| 216 | |
| 217 | static void __init dmi_save_devices(const struct dmi_header *dm) |
| 218 | { |
| 219 | int i, count = (dm->length - sizeof(struct dmi_header)) / 2; |
| 220 | |
| 221 | for (i = 0; i < count; i++) { |
| 222 | const char *d = (char *)(dm + 1) + (i * 2); |
| 223 | |
| 224 | /* Skip disabled device */ |
| 225 | if ((*d & 0x80) == 0) |
| 226 | continue; |
| 227 | |
| 228 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1))); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) |
| 233 | { |
| 234 | int i, count = *(u8 *)(dm + 1); |
| 235 | struct dmi_device *dev; |
| 236 | |
| 237 | for (i = 1; i <= count; i++) { |
| 238 | char *devname = dmi_string(dm, i); |
| 239 | |
| 240 | if (devname == dmi_empty_string) |
| 241 | continue; |
| 242 | |
| 243 | dev = dmi_alloc(sizeof(*dev)); |
| 244 | if (!dev) { |
| 245 | printk(KERN_ERR |
| 246 | "dmi_save_oem_strings_devices: out of memory.\n"); |
| 247 | break; |
| 248 | } |
| 249 | |
| 250 | dev->type = DMI_DEV_TYPE_OEM_STRING; |
| 251 | dev->name = devname; |
| 252 | dev->device_data = NULL; |
| 253 | |
| 254 | list_add(&dev->list, &dmi_devices); |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | static void __init dmi_save_ipmi_device(const struct dmi_header *dm) |
| 259 | { |
| 260 | struct dmi_device *dev; |
| 261 | void * data; |
| 262 | |
| 263 | data = dmi_alloc(dm->length); |
| 264 | if (data == NULL) { |
| 265 | printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n"); |
| 266 | return; |
| 267 | } |
| 268 | |
| 269 | memcpy(data, dm, dm->length); |
| 270 | |
| 271 | dev = dmi_alloc(sizeof(*dev)); |
| 272 | if (!dev) { |
| 273 | printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n"); |
| 274 | return; |
| 275 | } |
| 276 | |
| 277 | dev->type = DMI_DEV_TYPE_IPMI; |
| 278 | dev->name = "IPMI controller"; |
| 279 | dev->device_data = data; |
| 280 | |
| 281 | list_add_tail(&dev->list, &dmi_devices); |
| 282 | } |
| 283 | |
| 284 | static void __init dmi_save_extended_devices(const struct dmi_header *dm) |
| 285 | { |
| 286 | const u8 *d = (u8*) dm + 5; |
| 287 | |
| 288 | /* Skip disabled device */ |
| 289 | if ((*d & 0x80) == 0) |
| 290 | return; |
| 291 | |
| 292 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1))); |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * Process a DMI table entry. Right now all we care about are the BIOS |
| 297 | * and machine entries. For 2.5 we should pull the smbus controller info |
| 298 | * out of here. |
| 299 | */ |
| 300 | static void __init dmi_decode(const struct dmi_header *dm, void *dummy) |
| 301 | { |
| 302 | switch(dm->type) { |
| 303 | case 0: /* BIOS Information */ |
| 304 | dmi_save_ident(dm, DMI_BIOS_VENDOR, 4); |
| 305 | dmi_save_ident(dm, DMI_BIOS_VERSION, 5); |
| 306 | dmi_save_ident(dm, DMI_BIOS_DATE, 8); |
| 307 | break; |
| 308 | case 1: /* System Information */ |
| 309 | dmi_save_ident(dm, DMI_SYS_VENDOR, 4); |
| 310 | dmi_save_ident(dm, DMI_PRODUCT_NAME, 5); |
| 311 | dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6); |
| 312 | dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7); |
| 313 | dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8); |
| 314 | break; |
| 315 | case 2: /* Base Board Information */ |
| 316 | dmi_save_ident(dm, DMI_BOARD_VENDOR, 4); |
| 317 | dmi_save_ident(dm, DMI_BOARD_NAME, 5); |
| 318 | dmi_save_ident(dm, DMI_BOARD_VERSION, 6); |
| 319 | dmi_save_ident(dm, DMI_BOARD_SERIAL, 7); |
| 320 | dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8); |
| 321 | break; |
| 322 | case 3: /* Chassis Information */ |
| 323 | dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4); |
| 324 | dmi_save_type(dm, DMI_CHASSIS_TYPE, 5); |
| 325 | dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6); |
| 326 | dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7); |
| 327 | dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8); |
| 328 | break; |
| 329 | case 10: /* Onboard Devices Information */ |
| 330 | dmi_save_devices(dm); |
| 331 | break; |
| 332 | case 11: /* OEM Strings */ |
| 333 | dmi_save_oem_strings_devices(dm); |
| 334 | break; |
| 335 | case 38: /* IPMI Device Information */ |
| 336 | dmi_save_ipmi_device(dm); |
| 337 | break; |
| 338 | case 41: /* Onboard Devices Extended Information */ |
| 339 | dmi_save_extended_devices(dm); |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | static int __init dmi_present(const char __iomem *p) |
| 344 | { |
| 345 | u8 buf[15]; |
| 346 | |
| 347 | memcpy_fromio(buf, p, 15); |
| 348 | if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) { |
| 349 | dmi_num = (buf[13] << 8) | buf[12]; |
| 350 | dmi_len = (buf[7] << 8) | buf[6]; |
| 351 | dmi_base = (buf[11] << 24) | (buf[10] << 16) | |
| 352 | (buf[9] << 8) | buf[8]; |
| 353 | |
| 354 | /* |
| 355 | * DMI version 0.0 means that the real version is taken from |
| 356 | * the SMBIOS version, which we don't know at this point. |
| 357 | */ |
| 358 | if (buf[14] != 0) |
| 359 | printk(KERN_INFO "DMI %d.%d present.\n", |
| 360 | buf[14] >> 4, buf[14] & 0xF); |
| 361 | else |
| 362 | printk(KERN_INFO "DMI present.\n"); |
| 363 | if (dmi_walk_early(dmi_decode) == 0) |
| 364 | return 0; |
| 365 | } |
| 366 | return 1; |
| 367 | } |
| 368 | |
| 369 | void __init dmi_scan_machine(void) |
| 370 | { |
| 371 | char __iomem *p, *q; |
| 372 | int rc; |
| 373 | |
| 374 | if (efi_enabled) { |
| 375 | if (efi.smbios == EFI_INVALID_TABLE_ADDR) |
| 376 | goto error; |
| 377 | |
| 378 | /* This is called as a core_initcall() because it isn't |
| 379 | * needed during early boot. This also means we can |
| 380 | * iounmap the space when we're done with it. |
| 381 | */ |
| 382 | p = dmi_ioremap(efi.smbios, 32); |
| 383 | if (p == NULL) |
| 384 | goto error; |
| 385 | |
| 386 | rc = dmi_present(p + 0x10); /* offset of _DMI_ string */ |
| 387 | dmi_iounmap(p, 32); |
| 388 | if (!rc) { |
| 389 | dmi_available = 1; |
| 390 | goto out; |
| 391 | } |
| 392 | } |
| 393 | else { |
| 394 | /* |
| 395 | * no iounmap() for that ioremap(); it would be a no-op, but |
| 396 | * it's so early in setup that sucker gets confused into doing |
| 397 | * what it shouldn't if we actually call it. |
| 398 | */ |
| 399 | p = dmi_ioremap(0xF0000, 0x10000); |
| 400 | if (p == NULL) |
| 401 | goto error; |
| 402 | |
| 403 | for (q = p; q < p + 0x10000; q += 16) { |
| 404 | rc = dmi_present(q); |
| 405 | if (!rc) { |
| 406 | dmi_available = 1; |
| 407 | dmi_iounmap(p, 0x10000); |
| 408 | goto out; |
| 409 | } |
| 410 | } |
| 411 | dmi_iounmap(p, 0x10000); |
| 412 | } |
| 413 | error: |
| 414 | printk(KERN_INFO "DMI not present or invalid.\n"); |
| 415 | out: |
| 416 | dmi_initialized = 1; |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * dmi_matches - check if dmi_system_id structure matches system DMI data |
| 421 | * @dmi: pointer to the dmi_system_id structure to check |
| 422 | */ |
| 423 | static bool dmi_matches(const struct dmi_system_id *dmi) |
| 424 | { |
| 425 | int i; |
| 426 | |
| 427 | WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n"); |
| 428 | |
| 429 | for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) { |
| 430 | int s = dmi->matches[i].slot; |
| 431 | if (s == DMI_NONE) |
| 432 | continue; |
| 433 | if (dmi_ident[s] |
| 434 | && strstr(dmi_ident[s], dmi->matches[i].substr)) |
| 435 | continue; |
| 436 | /* No match */ |
| 437 | return false; |
| 438 | } |
| 439 | return true; |
| 440 | } |
| 441 | |
| 442 | /** |
| 443 | * dmi_check_system - check system DMI data |
| 444 | * @list: array of dmi_system_id structures to match against |
| 445 | * All non-null elements of the list must match |
| 446 | * their slot's (field index's) data (i.e., each |
| 447 | * list string must be a substring of the specified |
| 448 | * DMI slot's string data) to be considered a |
| 449 | * successful match. |
| 450 | * |
| 451 | * Walk the blacklist table running matching functions until someone |
| 452 | * returns non zero or we hit the end. Callback function is called for |
| 453 | * each successful match. Returns the number of matches. |
| 454 | */ |
| 455 | int dmi_check_system(const struct dmi_system_id *list) |
| 456 | { |
| 457 | int count = 0; |
| 458 | const struct dmi_system_id *d; |
| 459 | |
| 460 | for (d = list; d->ident; d++) |
| 461 | if (dmi_matches(d)) { |
| 462 | count++; |
| 463 | if (d->callback && d->callback(d)) |
| 464 | break; |
| 465 | } |
| 466 | |
| 467 | return count; |
| 468 | } |
| 469 | EXPORT_SYMBOL(dmi_check_system); |
| 470 | |
| 471 | /** |
| 472 | * dmi_first_match - find dmi_system_id structure matching system DMI data |
| 473 | * @list: array of dmi_system_id structures to match against |
| 474 | * All non-null elements of the list must match |
| 475 | * their slot's (field index's) data (i.e., each |
| 476 | * list string must be a substring of the specified |
| 477 | * DMI slot's string data) to be considered a |
| 478 | * successful match. |
| 479 | * |
| 480 | * Walk the blacklist table until the first match is found. Return the |
| 481 | * pointer to the matching entry or NULL if there's no match. |
| 482 | */ |
| 483 | const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list) |
| 484 | { |
| 485 | const struct dmi_system_id *d; |
| 486 | |
| 487 | for (d = list; d->ident; d++) |
| 488 | if (dmi_matches(d)) |
| 489 | return d; |
| 490 | |
| 491 | return NULL; |
| 492 | } |
| 493 | EXPORT_SYMBOL(dmi_first_match); |
| 494 | |
| 495 | /** |
| 496 | * dmi_get_system_info - return DMI data value |
| 497 | * @field: data index (see enum dmi_field) |
| 498 | * |
| 499 | * Returns one DMI data value, can be used to perform |
| 500 | * complex DMI data checks. |
| 501 | */ |
| 502 | const char *dmi_get_system_info(int field) |
| 503 | { |
| 504 | return dmi_ident[field]; |
| 505 | } |
| 506 | EXPORT_SYMBOL(dmi_get_system_info); |
| 507 | |
| 508 | /** |
| 509 | * dmi_name_in_serial - Check if string is in the DMI product serial information |
| 510 | * @str: string to check for |
| 511 | */ |
| 512 | int dmi_name_in_serial(const char *str) |
| 513 | { |
| 514 | int f = DMI_PRODUCT_SERIAL; |
| 515 | if (dmi_ident[f] && strstr(dmi_ident[f], str)) |
| 516 | return 1; |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information. |
| 522 | * @str: Case sensitive Name |
| 523 | */ |
| 524 | int dmi_name_in_vendors(const char *str) |
| 525 | { |
| 526 | static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR, |
| 527 | DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR, |
| 528 | DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE }; |
| 529 | int i; |
| 530 | for (i = 0; fields[i] != DMI_NONE; i++) { |
| 531 | int f = fields[i]; |
| 532 | if (dmi_ident[f] && strstr(dmi_ident[f], str)) |
| 533 | return 1; |
| 534 | } |
| 535 | return 0; |
| 536 | } |
| 537 | EXPORT_SYMBOL(dmi_name_in_vendors); |
| 538 | |
| 539 | /** |
| 540 | * dmi_find_device - find onboard device by type/name |
| 541 | * @type: device type or %DMI_DEV_TYPE_ANY to match all device types |
| 542 | * @name: device name string or %NULL to match all |
| 543 | * @from: previous device found in search, or %NULL for new search. |
| 544 | * |
| 545 | * Iterates through the list of known onboard devices. If a device is |
| 546 | * found with a matching @vendor and @device, a pointer to its device |
| 547 | * structure is returned. Otherwise, %NULL is returned. |
| 548 | * A new search is initiated by passing %NULL as the @from argument. |
| 549 | * If @from is not %NULL, searches continue from next device. |
| 550 | */ |
| 551 | const struct dmi_device * dmi_find_device(int type, const char *name, |
| 552 | const struct dmi_device *from) |
| 553 | { |
| 554 | const struct list_head *head = from ? &from->list : &dmi_devices; |
| 555 | struct list_head *d; |
| 556 | |
| 557 | for(d = head->next; d != &dmi_devices; d = d->next) { |
| 558 | const struct dmi_device *dev = |
| 559 | list_entry(d, struct dmi_device, list); |
| 560 | |
| 561 | if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) && |
| 562 | ((name == NULL) || (strcmp(dev->name, name) == 0))) |
| 563 | return dev; |
| 564 | } |
| 565 | |
| 566 | return NULL; |
| 567 | } |
| 568 | EXPORT_SYMBOL(dmi_find_device); |
| 569 | |
| 570 | /** |
| 571 | * dmi_get_year - Return year of a DMI date |
| 572 | * @field: data index (like dmi_get_system_info) |
| 573 | * |
| 574 | * Returns -1 when the field doesn't exist. 0 when it is broken. |
| 575 | */ |
| 576 | int dmi_get_year(int field) |
| 577 | { |
| 578 | int year; |
| 579 | const char *s = dmi_get_system_info(field); |
| 580 | |
| 581 | if (!s) |
| 582 | return -1; |
| 583 | if (*s == '\0') |
| 584 | return 0; |
| 585 | s = strrchr(s, '/'); |
| 586 | if (!s) |
| 587 | return 0; |
| 588 | |
| 589 | s += 1; |
| 590 | year = simple_strtoul(s, NULL, 0); |
| 591 | if (year && year < 100) { /* 2-digit year */ |
| 592 | year += 1900; |
| 593 | if (year < 1996) /* no dates < spec 1.0 */ |
| 594 | year += 100; |
| 595 | } |
| 596 | |
| 597 | return year; |
| 598 | } |
| 599 | EXPORT_SYMBOL(dmi_get_year); |
| 600 | |
| 601 | /** |
| 602 | * dmi_walk - Walk the DMI table and get called back for every record |
| 603 | * @decode: Callback function |
| 604 | * @private_data: Private data to be passed to the callback function |
| 605 | * |
| 606 | * Returns -1 when the DMI table can't be reached, 0 on success. |
| 607 | */ |
| 608 | int dmi_walk(void (*decode)(const struct dmi_header *, void *), |
| 609 | void *private_data) |
| 610 | { |
| 611 | u8 *buf; |
| 612 | |
| 613 | if (!dmi_available) |
| 614 | return -1; |
| 615 | |
| 616 | buf = ioremap(dmi_base, dmi_len); |
| 617 | if (buf == NULL) |
| 618 | return -1; |
| 619 | |
| 620 | dmi_table(buf, dmi_len, dmi_num, decode, private_data); |
| 621 | |
| 622 | iounmap(buf); |
| 623 | return 0; |
| 624 | } |
| 625 | EXPORT_SYMBOL_GPL(dmi_walk); |
| 626 | |
| 627 | /** |
| 628 | * dmi_match - compare a string to the dmi field (if exists) |
| 629 | * @f: DMI field identifier |
| 630 | * @str: string to compare the DMI field to |
| 631 | * |
| 632 | * Returns true if the requested field equals to the str (including NULL). |
| 633 | */ |
| 634 | bool dmi_match(enum dmi_field f, const char *str) |
| 635 | { |
| 636 | const char *info = dmi_get_system_info(f); |
| 637 | |
| 638 | if (info == NULL || str == NULL) |
| 639 | return info == str; |
| 640 | |
| 641 | return !strcmp(info, str); |
| 642 | } |
| 643 | EXPORT_SYMBOL_GPL(dmi_match); |