Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #include <linux/types.h> |
1da177e4 LT |
2 | #include <linux/string.h> |
3 | #include <linux/init.h> | |
4 | #include <linux/module.h> | |
1da177e4 | 5 | #include <linux/dmi.h> |
3ed3bce8 | 6 | #include <linux/efi.h> |
1da177e4 | 7 | #include <linux/bootmem.h> |
e9928674 | 8 | #include <linux/slab.h> |
f2d3efed | 9 | #include <asm/dmi.h> |
1da177e4 | 10 | |
cb5dd7c1 PJ |
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 | */ | |
79da4721 PW |
16 | static char dmi_empty_string[] = " "; |
17 | ||
f3069ae9 | 18 | static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s) |
1da177e4 | 19 | { |
1855256c | 20 | const u8 *bp = ((u8 *) dm) + dm->length; |
1249c513 | 21 | |
c3c7120d | 22 | if (s) { |
1da177e4 | 23 | s--; |
c3c7120d AP |
24 | while (s > 0 && *bp) { |
25 | bp += strlen(bp) + 1; | |
26 | s--; | |
27 | } | |
28 | ||
29 | if (*bp != 0) { | |
79da4721 PW |
30 | size_t len = strlen(bp)+1; |
31 | size_t cmp_len = len > 8 ? 8 : len; | |
32 | ||
33 | if (!memcmp(bp, dmi_empty_string, cmp_len)) | |
34 | return dmi_empty_string; | |
f3069ae9 | 35 | return bp; |
c3c7120d | 36 | } |
4f705ae3 | 37 | } |
c3c7120d | 38 | |
f3069ae9 JD |
39 | return ""; |
40 | } | |
41 | ||
42 | static char * __init dmi_string(const struct dmi_header *dm, u8 s) | |
43 | { | |
44 | const char *bp = dmi_string_nosave(dm, s); | |
45 | char *str; | |
46 | size_t len; | |
47 | ||
48 | if (bp == dmi_empty_string) | |
49 | return dmi_empty_string; | |
50 | ||
51 | len = strlen(bp) + 1; | |
52 | str = dmi_alloc(len); | |
53 | if (str != NULL) | |
54 | strcpy(str, bp); | |
55 | else | |
56 | printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len); | |
57 | ||
c3c7120d | 58 | return str; |
1da177e4 LT |
59 | } |
60 | ||
61 | /* | |
62 | * We have to be cautious here. We have seen BIOSes with DMI pointers | |
63 | * pointing to completely the wrong place for example | |
64 | */ | |
7fce084a JD |
65 | static void dmi_table(u8 *buf, int len, int num, |
66 | void (*decode)(const struct dmi_header *)) | |
1da177e4 | 67 | { |
7fce084a | 68 | u8 *data = buf; |
1249c513 | 69 | int i = 0; |
4f705ae3 | 70 | |
1da177e4 | 71 | /* |
4f705ae3 BH |
72 | * Stop when we see all the items the table claimed to have |
73 | * OR we run off the end of the table (also happens) | |
74 | */ | |
1249c513 | 75 | while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) { |
1855256c JG |
76 | const struct dmi_header *dm = (const struct dmi_header *)data; |
77 | ||
1da177e4 LT |
78 | /* |
79 | * We want to know the total length (formated area and strings) | |
80 | * before decoding to make sure we won't run off the table in | |
81 | * dmi_decode or dmi_string | |
82 | */ | |
1249c513 AP |
83 | data += dm->length; |
84 | while ((data - buf < len - 1) && (data[0] || data[1])) | |
1da177e4 | 85 | data++; |
1249c513 | 86 | if (data - buf < len - 1) |
1da177e4 | 87 | decode(dm); |
1249c513 | 88 | data += 2; |
1da177e4 LT |
89 | i++; |
90 | } | |
7fce084a JD |
91 | } |
92 | ||
93 | static u32 dmi_base; | |
94 | static u16 dmi_len; | |
95 | static u16 dmi_num; | |
96 | ||
97 | static int __init dmi_walk_early(void (*decode)(const struct dmi_header *)) | |
98 | { | |
99 | u8 *buf; | |
100 | ||
101 | buf = dmi_ioremap(dmi_base, dmi_len); | |
102 | if (buf == NULL) | |
103 | return -1; | |
104 | ||
105 | dmi_table(buf, dmi_len, dmi_num, decode); | |
106 | ||
107 | dmi_iounmap(buf, dmi_len); | |
1da177e4 LT |
108 | return 0; |
109 | } | |
110 | ||
1855256c | 111 | static int __init dmi_checksum(const u8 *buf) |
1da177e4 | 112 | { |
1249c513 | 113 | u8 sum = 0; |
1da177e4 | 114 | int a; |
4f705ae3 | 115 | |
1249c513 AP |
116 | for (a = 0; a < 15; a++) |
117 | sum += buf[a]; | |
118 | ||
119 | return sum == 0; | |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 | 122 | static char *dmi_ident[DMI_STRING_MAX]; |
ebad6a42 | 123 | static LIST_HEAD(dmi_devices); |
4f5c791a | 124 | int dmi_available; |
1da177e4 LT |
125 | |
126 | /* | |
127 | * Save a DMI string | |
128 | */ | |
1855256c | 129 | static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string) |
1da177e4 | 130 | { |
1855256c JG |
131 | const char *d = (const char*) dm; |
132 | char *p; | |
1249c513 | 133 | |
1da177e4 LT |
134 | if (dmi_ident[slot]) |
135 | return; | |
1249c513 | 136 | |
c3c7120d AP |
137 | p = dmi_string(dm, d[string]); |
138 | if (p == NULL) | |
139 | return; | |
140 | ||
141 | dmi_ident[slot] = p; | |
1da177e4 LT |
142 | } |
143 | ||
1855256c | 144 | static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index) |
4f5c791a | 145 | { |
1855256c | 146 | const u8 *d = (u8*) dm + index; |
4f5c791a LP |
147 | char *s; |
148 | int is_ff = 1, is_00 = 1, i; | |
149 | ||
150 | if (dmi_ident[slot]) | |
151 | return; | |
152 | ||
153 | for (i = 0; i < 16 && (is_ff || is_00); i++) { | |
154 | if(d[i] != 0x00) is_ff = 0; | |
155 | if(d[i] != 0xFF) is_00 = 0; | |
156 | } | |
157 | ||
158 | if (is_ff || is_00) | |
159 | return; | |
160 | ||
161 | s = dmi_alloc(16*2+4+1); | |
162 | if (!s) | |
163 | return; | |
164 | ||
165 | sprintf(s, | |
166 | "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", | |
167 | d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], | |
168 | d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]); | |
169 | ||
170 | dmi_ident[slot] = s; | |
171 | } | |
172 | ||
1855256c | 173 | static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index) |
4f5c791a | 174 | { |
1855256c | 175 | const u8 *d = (u8*) dm + index; |
4f5c791a LP |
176 | char *s; |
177 | ||
178 | if (dmi_ident[slot]) | |
179 | return; | |
180 | ||
181 | s = dmi_alloc(4); | |
182 | if (!s) | |
183 | return; | |
184 | ||
185 | sprintf(s, "%u", *d & 0x7F); | |
186 | dmi_ident[slot] = s; | |
187 | } | |
188 | ||
f3069ae9 JD |
189 | static void __init dmi_save_one_device(int type, const char *name) |
190 | { | |
191 | struct dmi_device *dev; | |
192 | ||
193 | /* No duplicate device */ | |
194 | if (dmi_find_device(type, name, NULL)) | |
195 | return; | |
196 | ||
197 | dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1); | |
198 | if (!dev) { | |
199 | printk(KERN_ERR "dmi_save_one_device: out of memory.\n"); | |
200 | return; | |
201 | } | |
202 | ||
203 | dev->type = type; | |
204 | strcpy((char *)(dev + 1), name); | |
205 | dev->name = (char *)(dev + 1); | |
206 | dev->device_data = NULL; | |
207 | list_add(&dev->list, &dmi_devices); | |
208 | } | |
209 | ||
1855256c | 210 | static void __init dmi_save_devices(const struct dmi_header *dm) |
ebad6a42 AP |
211 | { |
212 | int i, count = (dm->length - sizeof(struct dmi_header)) / 2; | |
ebad6a42 AP |
213 | |
214 | for (i = 0; i < count; i++) { | |
1855256c | 215 | const char *d = (char *)(dm + 1) + (i * 2); |
ebad6a42 AP |
216 | |
217 | /* Skip disabled device */ | |
218 | if ((*d & 0x80) == 0) | |
219 | continue; | |
220 | ||
f3069ae9 | 221 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1))); |
2e0c1f6c SM |
222 | } |
223 | } | |
224 | ||
1855256c | 225 | static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) |
2e0c1f6c SM |
226 | { |
227 | int i, count = *(u8 *)(dm + 1); | |
228 | struct dmi_device *dev; | |
229 | ||
230 | for (i = 1; i <= count; i++) { | |
79da4721 PW |
231 | char *devname = dmi_string(dm, i); |
232 | ||
43fe105a | 233 | if (devname == dmi_empty_string) |
79da4721 | 234 | continue; |
79da4721 | 235 | |
2e0c1f6c SM |
236 | dev = dmi_alloc(sizeof(*dev)); |
237 | if (!dev) { | |
238 | printk(KERN_ERR | |
239 | "dmi_save_oem_strings_devices: out of memory.\n"); | |
240 | break; | |
241 | } | |
242 | ||
243 | dev->type = DMI_DEV_TYPE_OEM_STRING; | |
79da4721 | 244 | dev->name = devname; |
2e0c1f6c | 245 | dev->device_data = NULL; |
ebad6a42 AP |
246 | |
247 | list_add(&dev->list, &dmi_devices); | |
248 | } | |
249 | } | |
250 | ||
1855256c | 251 | static void __init dmi_save_ipmi_device(const struct dmi_header *dm) |
ebad6a42 AP |
252 | { |
253 | struct dmi_device *dev; | |
254 | void * data; | |
255 | ||
e9928674 | 256 | data = dmi_alloc(dm->length); |
ebad6a42 AP |
257 | if (data == NULL) { |
258 | printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n"); | |
259 | return; | |
260 | } | |
261 | ||
262 | memcpy(data, dm, dm->length); | |
263 | ||
e9928674 | 264 | dev = dmi_alloc(sizeof(*dev)); |
ebad6a42 AP |
265 | if (!dev) { |
266 | printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n"); | |
267 | return; | |
268 | } | |
269 | ||
270 | dev->type = DMI_DEV_TYPE_IPMI; | |
271 | dev->name = "IPMI controller"; | |
272 | dev->device_data = data; | |
273 | ||
abd24df8 | 274 | list_add_tail(&dev->list, &dmi_devices); |
ebad6a42 AP |
275 | } |
276 | ||
b4bd7d59 WVS |
277 | static void __init dmi_save_extended_devices(const struct dmi_header *dm) |
278 | { | |
279 | const u8 *d = (u8*) dm + 5; | |
b4bd7d59 WVS |
280 | |
281 | /* Skip disabled device */ | |
282 | if ((*d & 0x80) == 0) | |
283 | return; | |
284 | ||
f3069ae9 | 285 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1))); |
b4bd7d59 WVS |
286 | } |
287 | ||
1da177e4 LT |
288 | /* |
289 | * Process a DMI table entry. Right now all we care about are the BIOS | |
290 | * and machine entries. For 2.5 we should pull the smbus controller info | |
291 | * out of here. | |
292 | */ | |
1855256c | 293 | static void __init dmi_decode(const struct dmi_header *dm) |
1da177e4 | 294 | { |
1249c513 | 295 | switch(dm->type) { |
ebad6a42 | 296 | case 0: /* BIOS Information */ |
1249c513 | 297 | dmi_save_ident(dm, DMI_BIOS_VENDOR, 4); |
1249c513 | 298 | dmi_save_ident(dm, DMI_BIOS_VERSION, 5); |
1249c513 AP |
299 | dmi_save_ident(dm, DMI_BIOS_DATE, 8); |
300 | break; | |
ebad6a42 | 301 | case 1: /* System Information */ |
1249c513 | 302 | dmi_save_ident(dm, DMI_SYS_VENDOR, 4); |
1249c513 | 303 | dmi_save_ident(dm, DMI_PRODUCT_NAME, 5); |
1249c513 | 304 | dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6); |
1249c513 | 305 | dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7); |
4f5c791a | 306 | dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8); |
1249c513 | 307 | break; |
ebad6a42 | 308 | case 2: /* Base Board Information */ |
1249c513 | 309 | dmi_save_ident(dm, DMI_BOARD_VENDOR, 4); |
1249c513 | 310 | dmi_save_ident(dm, DMI_BOARD_NAME, 5); |
1249c513 | 311 | dmi_save_ident(dm, DMI_BOARD_VERSION, 6); |
4f5c791a LP |
312 | dmi_save_ident(dm, DMI_BOARD_SERIAL, 7); |
313 | dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8); | |
314 | break; | |
315 | case 3: /* Chassis Information */ | |
316 | dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4); | |
317 | dmi_save_type(dm, DMI_CHASSIS_TYPE, 5); | |
318 | dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6); | |
319 | dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7); | |
320 | dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8); | |
1249c513 | 321 | break; |
ebad6a42 AP |
322 | case 10: /* Onboard Devices Information */ |
323 | dmi_save_devices(dm); | |
324 | break; | |
2e0c1f6c SM |
325 | case 11: /* OEM Strings */ |
326 | dmi_save_oem_strings_devices(dm); | |
327 | break; | |
ebad6a42 AP |
328 | case 38: /* IPMI Device Information */ |
329 | dmi_save_ipmi_device(dm); | |
b4bd7d59 WVS |
330 | break; |
331 | case 41: /* Onboard Devices Extended Information */ | |
332 | dmi_save_extended_devices(dm); | |
1da177e4 LT |
333 | } |
334 | } | |
335 | ||
1855256c | 336 | static int __init dmi_present(const char __iomem *p) |
1da177e4 | 337 | { |
61e032fa | 338 | u8 buf[15]; |
1855256c | 339 | |
3ed3bce8 MD |
340 | memcpy_fromio(buf, p, 15); |
341 | if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) { | |
7fce084a JD |
342 | dmi_num = (buf[13] << 8) | buf[12]; |
343 | dmi_len = (buf[7] << 8) | buf[6]; | |
344 | dmi_base = (buf[11] << 24) | (buf[10] << 16) | | |
3ed3bce8 | 345 | (buf[9] << 8) | buf[8]; |
61e032fa | 346 | |
3ed3bce8 MD |
347 | /* |
348 | * DMI version 0.0 means that the real version is taken from | |
349 | * the SMBIOS version, which we don't know at this point. | |
350 | */ | |
351 | if (buf[14] != 0) | |
352 | printk(KERN_INFO "DMI %d.%d present.\n", | |
353 | buf[14] >> 4, buf[14] & 0xF); | |
354 | else | |
355 | printk(KERN_INFO "DMI present.\n"); | |
7fce084a | 356 | if (dmi_walk_early(dmi_decode) == 0) |
3ed3bce8 MD |
357 | return 0; |
358 | } | |
359 | return 1; | |
360 | } | |
61e032fa | 361 | |
3ed3bce8 MD |
362 | void __init dmi_scan_machine(void) |
363 | { | |
364 | char __iomem *p, *q; | |
365 | int rc; | |
366 | ||
367 | if (efi_enabled) { | |
b2c99e3c | 368 | if (efi.smbios == EFI_INVALID_TABLE_ADDR) |
3ed3bce8 MD |
369 | goto out; |
370 | ||
4f5c791a LP |
371 | /* This is called as a core_initcall() because it isn't |
372 | * needed during early boot. This also means we can | |
373 | * iounmap the space when we're done with it. | |
374 | */ | |
b2c99e3c | 375 | p = dmi_ioremap(efi.smbios, 32); |
3ed3bce8 MD |
376 | if (p == NULL) |
377 | goto out; | |
378 | ||
379 | rc = dmi_present(p + 0x10); /* offset of _DMI_ string */ | |
23dd842c | 380 | dmi_iounmap(p, 32); |
4f5c791a LP |
381 | if (!rc) { |
382 | dmi_available = 1; | |
3ed3bce8 | 383 | return; |
4f5c791a | 384 | } |
3ed3bce8 MD |
385 | } |
386 | else { | |
387 | /* | |
388 | * no iounmap() for that ioremap(); it would be a no-op, but | |
389 | * it's so early in setup that sucker gets confused into doing | |
390 | * what it shouldn't if we actually call it. | |
391 | */ | |
392 | p = dmi_ioremap(0xF0000, 0x10000); | |
393 | if (p == NULL) | |
394 | goto out; | |
395 | ||
396 | for (q = p; q < p + 0x10000; q += 16) { | |
397 | rc = dmi_present(q); | |
4f5c791a LP |
398 | if (!rc) { |
399 | dmi_available = 1; | |
0d64484f | 400 | dmi_iounmap(p, 0x10000); |
61e032fa | 401 | return; |
4f5c791a | 402 | } |
61e032fa | 403 | } |
3212bff3 | 404 | dmi_iounmap(p, 0x10000); |
61e032fa | 405 | } |
3ed3bce8 | 406 | out: printk(KERN_INFO "DMI not present or invalid.\n"); |
1da177e4 LT |
407 | } |
408 | ||
1da177e4 LT |
409 | /** |
410 | * dmi_check_system - check system DMI data | |
411 | * @list: array of dmi_system_id structures to match against | |
b0ef371e RD |
412 | * All non-null elements of the list must match |
413 | * their slot's (field index's) data (i.e., each | |
414 | * list string must be a substring of the specified | |
415 | * DMI slot's string data) to be considered a | |
416 | * successful match. | |
1da177e4 LT |
417 | * |
418 | * Walk the blacklist table running matching functions until someone | |
419 | * returns non zero or we hit the end. Callback function is called for | |
b0ef371e | 420 | * each successful match. Returns the number of matches. |
1da177e4 | 421 | */ |
1855256c | 422 | int dmi_check_system(const struct dmi_system_id *list) |
1da177e4 LT |
423 | { |
424 | int i, count = 0; | |
1855256c | 425 | const struct dmi_system_id *d = list; |
1da177e4 LT |
426 | |
427 | while (d->ident) { | |
428 | for (i = 0; i < ARRAY_SIZE(d->matches); i++) { | |
429 | int s = d->matches[i].slot; | |
430 | if (s == DMI_NONE) | |
431 | continue; | |
432 | if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr)) | |
433 | continue; | |
434 | /* No match */ | |
435 | goto fail; | |
436 | } | |
640e8033 | 437 | count++; |
1da177e4 LT |
438 | if (d->callback && d->callback(d)) |
439 | break; | |
1da177e4 LT |
440 | fail: d++; |
441 | } | |
442 | ||
443 | return count; | |
444 | } | |
1da177e4 LT |
445 | EXPORT_SYMBOL(dmi_check_system); |
446 | ||
447 | /** | |
448 | * dmi_get_system_info - return DMI data value | |
b0ef371e | 449 | * @field: data index (see enum dmi_field) |
1da177e4 LT |
450 | * |
451 | * Returns one DMI data value, can be used to perform | |
452 | * complex DMI data checks. | |
453 | */ | |
1855256c | 454 | const char *dmi_get_system_info(int field) |
1da177e4 LT |
455 | { |
456 | return dmi_ident[field]; | |
457 | } | |
e70c9d5e | 458 | EXPORT_SYMBOL(dmi_get_system_info); |
ebad6a42 | 459 | |
a1bae672 AK |
460 | |
461 | /** | |
462 | * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information. | |
463 | * @str: Case sensitive Name | |
464 | */ | |
1855256c | 465 | int dmi_name_in_vendors(const char *str) |
a1bae672 AK |
466 | { |
467 | static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR, | |
468 | DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR, | |
469 | DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE }; | |
470 | int i; | |
471 | for (i = 0; fields[i] != DMI_NONE; i++) { | |
472 | int f = fields[i]; | |
473 | if (dmi_ident[f] && strstr(dmi_ident[f], str)) | |
474 | return 1; | |
475 | } | |
476 | return 0; | |
477 | } | |
478 | EXPORT_SYMBOL(dmi_name_in_vendors); | |
479 | ||
ebad6a42 AP |
480 | /** |
481 | * dmi_find_device - find onboard device by type/name | |
482 | * @type: device type or %DMI_DEV_TYPE_ANY to match all device types | |
b0ef371e | 483 | * @name: device name string or %NULL to match all |
ebad6a42 AP |
484 | * @from: previous device found in search, or %NULL for new search. |
485 | * | |
486 | * Iterates through the list of known onboard devices. If a device is | |
487 | * found with a matching @vendor and @device, a pointer to its device | |
488 | * structure is returned. Otherwise, %NULL is returned. | |
b0ef371e | 489 | * A new search is initiated by passing %NULL as the @from argument. |
ebad6a42 AP |
490 | * If @from is not %NULL, searches continue from next device. |
491 | */ | |
1855256c JG |
492 | const struct dmi_device * dmi_find_device(int type, const char *name, |
493 | const struct dmi_device *from) | |
ebad6a42 | 494 | { |
1855256c JG |
495 | const struct list_head *head = from ? &from->list : &dmi_devices; |
496 | struct list_head *d; | |
ebad6a42 AP |
497 | |
498 | for(d = head->next; d != &dmi_devices; d = d->next) { | |
1855256c JG |
499 | const struct dmi_device *dev = |
500 | list_entry(d, struct dmi_device, list); | |
ebad6a42 AP |
501 | |
502 | if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) && | |
503 | ((name == NULL) || (strcmp(dev->name, name) == 0))) | |
504 | return dev; | |
505 | } | |
506 | ||
507 | return NULL; | |
508 | } | |
509 | EXPORT_SYMBOL(dmi_find_device); | |
f083a329 AK |
510 | |
511 | /** | |
512 | * dmi_get_year - Return year of a DMI date | |
513 | * @field: data index (like dmi_get_system_info) | |
514 | * | |
515 | * Returns -1 when the field doesn't exist. 0 when it is broken. | |
516 | */ | |
517 | int dmi_get_year(int field) | |
518 | { | |
519 | int year; | |
1855256c | 520 | const char *s = dmi_get_system_info(field); |
f083a329 AK |
521 | |
522 | if (!s) | |
523 | return -1; | |
524 | if (*s == '\0') | |
525 | return 0; | |
526 | s = strrchr(s, '/'); | |
527 | if (!s) | |
528 | return 0; | |
529 | ||
530 | s += 1; | |
531 | year = simple_strtoul(s, NULL, 0); | |
532 | if (year && year < 100) { /* 2-digit year */ | |
533 | year += 1900; | |
534 | if (year < 1996) /* no dates < spec 1.0 */ | |
535 | year += 100; | |
536 | } | |
537 | ||
538 | return year; | |
539 | } | |
7fce084a JD |
540 | |
541 | /** | |
542 | * dmi_walk - Walk the DMI table and get called back for every record | |
543 | * @decode: Callback function | |
544 | * | |
545 | * Returns -1 when the DMI table can't be reached, 0 on success. | |
546 | */ | |
547 | int dmi_walk(void (*decode)(const struct dmi_header *)) | |
548 | { | |
549 | u8 *buf; | |
550 | ||
551 | if (!dmi_available) | |
552 | return -1; | |
553 | ||
554 | buf = ioremap(dmi_base, dmi_len); | |
555 | if (buf == NULL) | |
556 | return -1; | |
557 | ||
558 | dmi_table(buf, dmi_len, dmi_num, decode); | |
559 | ||
560 | iounmap(buf); | |
561 | return 0; | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(dmi_walk); |