Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / firmware / dmi_scan.c
blobbcb1126e3d00b2357a0c5748edbd8b1b470c0423
1 #include <linux/types.h>
2 #include <linux/string.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
5 #include <linux/ctype.h>
6 #include <linux/dmi.h>
7 #include <linux/efi.h>
8 #include <linux/bootmem.h>
9 #include <asm/dmi.h>
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
16 static char dmi_empty_string[] = " ";
19 * Catch too early calls to dmi_check_system():
21 static int dmi_initialized;
23 static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
25 const u8 *bp = ((u8 *) dm) + dm->length;
27 if (s) {
28 s--;
29 while (s > 0 && *bp) {
30 bp += strlen(bp) + 1;
31 s--;
34 if (*bp != 0) {
35 size_t len = strlen(bp)+1;
36 size_t cmp_len = len > 8 ? 8 : len;
38 if (!memcmp(bp, dmi_empty_string, cmp_len))
39 return dmi_empty_string;
40 return bp;
44 return "";
47 static char * __init dmi_string(const struct dmi_header *dm, u8 s)
49 const char *bp = dmi_string_nosave(dm, s);
50 char *str;
51 size_t len;
53 if (bp == dmi_empty_string)
54 return dmi_empty_string;
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);
63 return str;
67 * We have to be cautious here. We have seen BIOSes with DMI pointers
68 * pointing to completely the wrong place for example
70 static void dmi_table(u8 *buf, int len, int num,
71 void (*decode)(const struct dmi_header *, void *),
72 void *private_data)
74 u8 *data = buf;
75 int i = 0;
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)
81 while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
82 const struct dmi_header *dm = (const struct dmi_header *)data;
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
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++;
99 static u32 dmi_base;
100 static u16 dmi_len;
101 static u16 dmi_num;
103 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
104 void *))
106 u8 *buf;
108 buf = dmi_ioremap(dmi_base, dmi_len);
109 if (buf == NULL)
110 return -1;
112 dmi_table(buf, dmi_len, dmi_num, decode, NULL);
114 dmi_iounmap(buf, dmi_len);
115 return 0;
118 static int __init dmi_checksum(const u8 *buf)
120 u8 sum = 0;
121 int a;
123 for (a = 0; a < 15; a++)
124 sum += buf[a];
126 return sum == 0;
129 static char *dmi_ident[DMI_STRING_MAX];
130 static LIST_HEAD(dmi_devices);
131 int dmi_available;
134 * Save a DMI string
136 static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
138 const char *d = (const char*) dm;
139 char *p;
141 if (dmi_ident[slot])
142 return;
144 p = dmi_string(dm, d[string]);
145 if (p == NULL)
146 return;
148 dmi_ident[slot] = p;
151 static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
153 const u8 *d = (u8*) dm + index;
154 char *s;
155 int is_ff = 1, is_00 = 1, i;
157 if (dmi_ident[slot])
158 return;
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;
165 if (is_ff || is_00)
166 return;
168 s = dmi_alloc(16*2+4+1);
169 if (!s)
170 return;
172 sprintf(s, "%pUB", d);
174 dmi_ident[slot] = s;
177 static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
179 const u8 *d = (u8*) dm + index;
180 char *s;
182 if (dmi_ident[slot])
183 return;
185 s = dmi_alloc(4);
186 if (!s)
187 return;
189 sprintf(s, "%u", *d & 0x7F);
190 dmi_ident[slot] = s;
193 static void __init dmi_save_one_device(int type, const char *name)
195 struct dmi_device *dev;
197 /* No duplicate device */
198 if (dmi_find_device(type, name, NULL))
199 return;
201 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
202 if (!dev) {
203 printk(KERN_ERR "dmi_save_one_device: out of memory.\n");
204 return;
207 dev->type = type;
208 strcpy((char *)(dev + 1), name);
209 dev->name = (char *)(dev + 1);
210 dev->device_data = NULL;
211 list_add(&dev->list, &dmi_devices);
214 static void __init dmi_save_devices(const struct dmi_header *dm)
216 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
218 for (i = 0; i < count; i++) {
219 const char *d = (char *)(dm + 1) + (i * 2);
221 /* Skip disabled device */
222 if ((*d & 0x80) == 0)
223 continue;
225 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
229 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
231 int i, count = *(u8 *)(dm + 1);
232 struct dmi_device *dev;
234 for (i = 1; i <= count; i++) {
235 char *devname = dmi_string(dm, i);
237 if (devname == dmi_empty_string)
238 continue;
240 dev = dmi_alloc(sizeof(*dev));
241 if (!dev) {
242 printk(KERN_ERR
243 "dmi_save_oem_strings_devices: out of memory.\n");
244 break;
247 dev->type = DMI_DEV_TYPE_OEM_STRING;
248 dev->name = devname;
249 dev->device_data = NULL;
251 list_add(&dev->list, &dmi_devices);
255 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
257 struct dmi_device *dev;
258 void * data;
260 data = dmi_alloc(dm->length);
261 if (data == NULL) {
262 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
263 return;
266 memcpy(data, dm, dm->length);
268 dev = dmi_alloc(sizeof(*dev));
269 if (!dev) {
270 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
271 return;
274 dev->type = DMI_DEV_TYPE_IPMI;
275 dev->name = "IPMI controller";
276 dev->device_data = data;
278 list_add_tail(&dev->list, &dmi_devices);
281 static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
282 int devfn, const char *name)
284 struct dmi_dev_onboard *onboard_dev;
286 onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
287 if (!onboard_dev) {
288 printk(KERN_ERR "dmi_save_dev_onboard: out of memory.\n");
289 return;
291 onboard_dev->instance = instance;
292 onboard_dev->segment = segment;
293 onboard_dev->bus = bus;
294 onboard_dev->devfn = devfn;
296 strcpy((char *)&onboard_dev[1], name);
297 onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
298 onboard_dev->dev.name = (char *)&onboard_dev[1];
299 onboard_dev->dev.device_data = onboard_dev;
301 list_add(&onboard_dev->dev.list, &dmi_devices);
304 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
306 const u8 *d = (u8*) dm + 5;
308 /* Skip disabled device */
309 if ((*d & 0x80) == 0)
310 return;
312 dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
313 dmi_string_nosave(dm, *(d-1)));
314 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
318 * Process a DMI table entry. Right now all we care about are the BIOS
319 * and machine entries. For 2.5 we should pull the smbus controller info
320 * out of here.
322 static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
324 switch(dm->type) {
325 case 0: /* BIOS Information */
326 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
327 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
328 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
329 break;
330 case 1: /* System Information */
331 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
332 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
333 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
334 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
335 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
336 break;
337 case 2: /* Base Board Information */
338 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
339 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
340 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
341 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
342 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
343 break;
344 case 3: /* Chassis Information */
345 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
346 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
347 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
348 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
349 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
350 break;
351 case 10: /* Onboard Devices Information */
352 dmi_save_devices(dm);
353 break;
354 case 11: /* OEM Strings */
355 dmi_save_oem_strings_devices(dm);
356 break;
357 case 38: /* IPMI Device Information */
358 dmi_save_ipmi_device(dm);
359 break;
360 case 41: /* Onboard Devices Extended Information */
361 dmi_save_extended_devices(dm);
365 static void __init print_filtered(const char *info)
367 const char *p;
369 if (!info)
370 return;
372 for (p = info; *p; p++)
373 if (isprint(*p))
374 printk(KERN_CONT "%c", *p);
375 else
376 printk(KERN_CONT "\\x%02x", *p & 0xff);
379 static void __init dmi_dump_ids(void)
381 const char *board; /* Board Name is optional */
383 printk(KERN_DEBUG "DMI: ");
384 print_filtered(dmi_get_system_info(DMI_SYS_VENDOR));
385 printk(KERN_CONT " ");
386 print_filtered(dmi_get_system_info(DMI_PRODUCT_NAME));
387 board = dmi_get_system_info(DMI_BOARD_NAME);
388 if (board) {
389 printk(KERN_CONT "/");
390 print_filtered(board);
392 printk(KERN_CONT ", BIOS ");
393 print_filtered(dmi_get_system_info(DMI_BIOS_VERSION));
394 printk(KERN_CONT " ");
395 print_filtered(dmi_get_system_info(DMI_BIOS_DATE));
396 printk(KERN_CONT "\n");
399 static int __init dmi_present(const char __iomem *p)
401 u8 buf[15];
403 memcpy_fromio(buf, p, 15);
404 if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
405 dmi_num = (buf[13] << 8) | buf[12];
406 dmi_len = (buf[7] << 8) | buf[6];
407 dmi_base = (buf[11] << 24) | (buf[10] << 16) |
408 (buf[9] << 8) | buf[8];
411 * DMI version 0.0 means that the real version is taken from
412 * the SMBIOS version, which we don't know at this point.
414 if (buf[14] != 0)
415 printk(KERN_INFO "DMI %d.%d present.\n",
416 buf[14] >> 4, buf[14] & 0xF);
417 else
418 printk(KERN_INFO "DMI present.\n");
419 if (dmi_walk_early(dmi_decode) == 0) {
420 dmi_dump_ids();
421 return 0;
424 return 1;
427 void __init dmi_scan_machine(void)
429 char __iomem *p, *q;
430 int rc;
432 if (efi_enabled) {
433 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
434 goto error;
436 /* This is called as a core_initcall() because it isn't
437 * needed during early boot. This also means we can
438 * iounmap the space when we're done with it.
440 p = dmi_ioremap(efi.smbios, 32);
441 if (p == NULL)
442 goto error;
444 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
445 dmi_iounmap(p, 32);
446 if (!rc) {
447 dmi_available = 1;
448 goto out;
451 else {
453 * no iounmap() for that ioremap(); it would be a no-op, but
454 * it's so early in setup that sucker gets confused into doing
455 * what it shouldn't if we actually call it.
457 p = dmi_ioremap(0xF0000, 0x10000);
458 if (p == NULL)
459 goto error;
461 for (q = p; q < p + 0x10000; q += 16) {
462 rc = dmi_present(q);
463 if (!rc) {
464 dmi_available = 1;
465 dmi_iounmap(p, 0x10000);
466 goto out;
469 dmi_iounmap(p, 0x10000);
471 error:
472 printk(KERN_INFO "DMI not present or invalid.\n");
473 out:
474 dmi_initialized = 1;
478 * dmi_matches - check if dmi_system_id structure matches system DMI data
479 * @dmi: pointer to the dmi_system_id structure to check
481 static bool dmi_matches(const struct dmi_system_id *dmi)
483 int i;
485 WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
487 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
488 int s = dmi->matches[i].slot;
489 if (s == DMI_NONE)
490 break;
491 if (dmi_ident[s]
492 && strstr(dmi_ident[s], dmi->matches[i].substr))
493 continue;
494 /* No match */
495 return false;
497 return true;
501 * dmi_is_end_of_table - check for end-of-table marker
502 * @dmi: pointer to the dmi_system_id structure to check
504 static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
506 return dmi->matches[0].slot == DMI_NONE;
510 * dmi_check_system - check system DMI data
511 * @list: array of dmi_system_id structures to match against
512 * All non-null elements of the list must match
513 * their slot's (field index's) data (i.e., each
514 * list string must be a substring of the specified
515 * DMI slot's string data) to be considered a
516 * successful match.
518 * Walk the blacklist table running matching functions until someone
519 * returns non zero or we hit the end. Callback function is called for
520 * each successful match. Returns the number of matches.
522 int dmi_check_system(const struct dmi_system_id *list)
524 int count = 0;
525 const struct dmi_system_id *d;
527 for (d = list; !dmi_is_end_of_table(d); d++)
528 if (dmi_matches(d)) {
529 count++;
530 if (d->callback && d->callback(d))
531 break;
534 return count;
536 EXPORT_SYMBOL(dmi_check_system);
539 * dmi_first_match - find dmi_system_id structure matching system DMI data
540 * @list: array of dmi_system_id structures to match against
541 * All non-null elements of the list must match
542 * their slot's (field index's) data (i.e., each
543 * list string must be a substring of the specified
544 * DMI slot's string data) to be considered a
545 * successful match.
547 * Walk the blacklist table until the first match is found. Return the
548 * pointer to the matching entry or NULL if there's no match.
550 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
552 const struct dmi_system_id *d;
554 for (d = list; !dmi_is_end_of_table(d); d++)
555 if (dmi_matches(d))
556 return d;
558 return NULL;
560 EXPORT_SYMBOL(dmi_first_match);
563 * dmi_get_system_info - return DMI data value
564 * @field: data index (see enum dmi_field)
566 * Returns one DMI data value, can be used to perform
567 * complex DMI data checks.
569 const char *dmi_get_system_info(int field)
571 return dmi_ident[field];
573 EXPORT_SYMBOL(dmi_get_system_info);
576 * dmi_name_in_serial - Check if string is in the DMI product serial information
577 * @str: string to check for
579 int dmi_name_in_serial(const char *str)
581 int f = DMI_PRODUCT_SERIAL;
582 if (dmi_ident[f] && strstr(dmi_ident[f], str))
583 return 1;
584 return 0;
588 * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
589 * @str: Case sensitive Name
591 int dmi_name_in_vendors(const char *str)
593 static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR,
594 DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR,
595 DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE };
596 int i;
597 for (i = 0; fields[i] != DMI_NONE; i++) {
598 int f = fields[i];
599 if (dmi_ident[f] && strstr(dmi_ident[f], str))
600 return 1;
602 return 0;
604 EXPORT_SYMBOL(dmi_name_in_vendors);
607 * dmi_find_device - find onboard device by type/name
608 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
609 * @name: device name string or %NULL to match all
610 * @from: previous device found in search, or %NULL for new search.
612 * Iterates through the list of known onboard devices. If a device is
613 * found with a matching @vendor and @device, a pointer to its device
614 * structure is returned. Otherwise, %NULL is returned.
615 * A new search is initiated by passing %NULL as the @from argument.
616 * If @from is not %NULL, searches continue from next device.
618 const struct dmi_device * dmi_find_device(int type, const char *name,
619 const struct dmi_device *from)
621 const struct list_head *head = from ? &from->list : &dmi_devices;
622 struct list_head *d;
624 for(d = head->next; d != &dmi_devices; d = d->next) {
625 const struct dmi_device *dev =
626 list_entry(d, struct dmi_device, list);
628 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
629 ((name == NULL) || (strcmp(dev->name, name) == 0)))
630 return dev;
633 return NULL;
635 EXPORT_SYMBOL(dmi_find_device);
638 * dmi_get_date - parse a DMI date
639 * @field: data index (see enum dmi_field)
640 * @yearp: optional out parameter for the year
641 * @monthp: optional out parameter for the month
642 * @dayp: optional out parameter for the day
644 * The date field is assumed to be in the form resembling
645 * [mm[/dd]]/yy[yy] and the result is stored in the out
646 * parameters any or all of which can be omitted.
648 * If the field doesn't exist, all out parameters are set to zero
649 * and false is returned. Otherwise, true is returned with any
650 * invalid part of date set to zero.
652 * On return, year, month and day are guaranteed to be in the
653 * range of [0,9999], [0,12] and [0,31] respectively.
655 bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
657 int year = 0, month = 0, day = 0;
658 bool exists;
659 const char *s, *y;
660 char *e;
662 s = dmi_get_system_info(field);
663 exists = s;
664 if (!exists)
665 goto out;
668 * Determine year first. We assume the date string resembles
669 * mm/dd/yy[yy] but the original code extracted only the year
670 * from the end. Keep the behavior in the spirit of no
671 * surprises.
673 y = strrchr(s, '/');
674 if (!y)
675 goto out;
677 y++;
678 year = simple_strtoul(y, &e, 10);
679 if (y != e && year < 100) { /* 2-digit year */
680 year += 1900;
681 if (year < 1996) /* no dates < spec 1.0 */
682 year += 100;
684 if (year > 9999) /* year should fit in %04d */
685 year = 0;
687 /* parse the mm and dd */
688 month = simple_strtoul(s, &e, 10);
689 if (s == e || *e != '/' || !month || month > 12) {
690 month = 0;
691 goto out;
694 s = e + 1;
695 day = simple_strtoul(s, &e, 10);
696 if (s == y || s == e || *e != '/' || day > 31)
697 day = 0;
698 out:
699 if (yearp)
700 *yearp = year;
701 if (monthp)
702 *monthp = month;
703 if (dayp)
704 *dayp = day;
705 return exists;
707 EXPORT_SYMBOL(dmi_get_date);
710 * dmi_walk - Walk the DMI table and get called back for every record
711 * @decode: Callback function
712 * @private_data: Private data to be passed to the callback function
714 * Returns -1 when the DMI table can't be reached, 0 on success.
716 int dmi_walk(void (*decode)(const struct dmi_header *, void *),
717 void *private_data)
719 u8 *buf;
721 if (!dmi_available)
722 return -1;
724 buf = ioremap(dmi_base, dmi_len);
725 if (buf == NULL)
726 return -1;
728 dmi_table(buf, dmi_len, dmi_num, decode, private_data);
730 iounmap(buf);
731 return 0;
733 EXPORT_SYMBOL_GPL(dmi_walk);
736 * dmi_match - compare a string to the dmi field (if exists)
737 * @f: DMI field identifier
738 * @str: string to compare the DMI field to
740 * Returns true if the requested field equals to the str (including NULL).
742 bool dmi_match(enum dmi_field f, const char *str)
744 const char *info = dmi_get_system_info(f);
746 if (info == NULL || str == NULL)
747 return info == str;
749 return !strcmp(info, str);
751 EXPORT_SYMBOL_GPL(dmi_match);