OMAP3: PM: Prevented DVFS state switches when enabling off-mode
[linux-ginger.git] / drivers / firmware / dmi_scan.c
blob938100f14b16e0b4c56a4cbd7b6e13447dac4ebf
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>
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,
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]);
177 dmi_ident[slot] = s;
180 static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
182 const u8 *d = (u8*) dm + index;
183 char *s;
185 if (dmi_ident[slot])
186 return;
188 s = dmi_alloc(4);
189 if (!s)
190 return;
192 sprintf(s, "%u", *d & 0x7F);
193 dmi_ident[slot] = s;
196 static void __init dmi_save_one_device(int type, const char *name)
198 struct dmi_device *dev;
200 /* No duplicate device */
201 if (dmi_find_device(type, name, NULL))
202 return;
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;
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);
217 static void __init dmi_save_devices(const struct dmi_header *dm)
219 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
221 for (i = 0; i < count; i++) {
222 const char *d = (char *)(dm + 1) + (i * 2);
224 /* Skip disabled device */
225 if ((*d & 0x80) == 0)
226 continue;
228 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
232 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
234 int i, count = *(u8 *)(dm + 1);
235 struct dmi_device *dev;
237 for (i = 1; i <= count; i++) {
238 char *devname = dmi_string(dm, i);
240 if (devname == dmi_empty_string)
241 continue;
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;
250 dev->type = DMI_DEV_TYPE_OEM_STRING;
251 dev->name = devname;
252 dev->device_data = NULL;
254 list_add(&dev->list, &dmi_devices);
258 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
260 struct dmi_device *dev;
261 void * data;
263 data = dmi_alloc(dm->length);
264 if (data == NULL) {
265 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
266 return;
269 memcpy(data, dm, dm->length);
271 dev = dmi_alloc(sizeof(*dev));
272 if (!dev) {
273 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
274 return;
277 dev->type = DMI_DEV_TYPE_IPMI;
278 dev->name = "IPMI controller";
279 dev->device_data = data;
281 list_add_tail(&dev->list, &dmi_devices);
284 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
286 const u8 *d = (u8*) dm + 5;
288 /* Skip disabled device */
289 if ((*d & 0x80) == 0)
290 return;
292 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
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.
300 static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
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);
343 static int __init dmi_present(const char __iomem *p)
345 u8 buf[15];
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];
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.
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;
366 return 1;
369 void __init dmi_scan_machine(void)
371 char __iomem *p, *q;
372 int rc;
374 if (efi_enabled) {
375 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
376 goto error;
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.
382 p = dmi_ioremap(efi.smbios, 32);
383 if (p == NULL)
384 goto error;
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;
393 else {
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.
399 p = dmi_ioremap(0xF0000, 0x10000);
400 if (p == NULL)
401 goto error;
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;
411 dmi_iounmap(p, 0x10000);
413 error:
414 printk(KERN_INFO "DMI not present or invalid.\n");
415 out:
416 dmi_initialized = 1;
420 * dmi_matches - check if dmi_system_id structure matches system DMI data
421 * @dmi: pointer to the dmi_system_id structure to check
423 static bool dmi_matches(const struct dmi_system_id *dmi)
425 int i;
427 WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
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;
439 return true;
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.
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.
455 int dmi_check_system(const struct dmi_system_id *list)
457 int count = 0;
458 const struct dmi_system_id *d;
460 for (d = list; d->ident; d++)
461 if (dmi_matches(d)) {
462 count++;
463 if (d->callback && d->callback(d))
464 break;
467 return count;
469 EXPORT_SYMBOL(dmi_check_system);
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.
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.
483 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
485 const struct dmi_system_id *d;
487 for (d = list; d->ident; d++)
488 if (dmi_matches(d))
489 return d;
491 return NULL;
493 EXPORT_SYMBOL(dmi_first_match);
496 * dmi_get_system_info - return DMI data value
497 * @field: data index (see enum dmi_field)
499 * Returns one DMI data value, can be used to perform
500 * complex DMI data checks.
502 const char *dmi_get_system_info(int field)
504 return dmi_ident[field];
506 EXPORT_SYMBOL(dmi_get_system_info);
509 * dmi_name_in_serial - Check if string is in the DMI product serial information
510 * @str: string to check for
512 int dmi_name_in_serial(const char *str)
514 int f = DMI_PRODUCT_SERIAL;
515 if (dmi_ident[f] && strstr(dmi_ident[f], str))
516 return 1;
517 return 0;
521 * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
522 * @str: Case sensitive Name
524 int dmi_name_in_vendors(const char *str)
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;
535 return 0;
537 EXPORT_SYMBOL(dmi_name_in_vendors);
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.
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.
551 const struct dmi_device * dmi_find_device(int type, const char *name,
552 const struct dmi_device *from)
554 const struct list_head *head = from ? &from->list : &dmi_devices;
555 struct list_head *d;
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);
561 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
562 ((name == NULL) || (strcmp(dev->name, name) == 0)))
563 return dev;
566 return NULL;
568 EXPORT_SYMBOL(dmi_find_device);
571 * dmi_get_date - parse a DMI date
572 * @field: data index (see enum dmi_field)
573 * @yearp: optional out parameter for the year
574 * @monthp: optional out parameter for the month
575 * @dayp: optional out parameter for the day
577 * The date field is assumed to be in the form resembling
578 * [mm[/dd]]/yy[yy] and the result is stored in the out
579 * parameters any or all of which can be omitted.
581 * If the field doesn't exist, all out parameters are set to zero
582 * and false is returned. Otherwise, true is returned with any
583 * invalid part of date set to zero.
585 * On return, year, month and day are guaranteed to be in the
586 * range of [0,9999], [0,12] and [0,31] respectively.
588 bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
590 int year = 0, month = 0, day = 0;
591 bool exists;
592 const char *s, *y;
593 char *e;
595 s = dmi_get_system_info(field);
596 exists = s;
597 if (!exists)
598 goto out;
601 * Determine year first. We assume the date string resembles
602 * mm/dd/yy[yy] but the original code extracted only the year
603 * from the end. Keep the behavior in the spirit of no
604 * surprises.
606 y = strrchr(s, '/');
607 if (!y)
608 goto out;
610 y++;
611 year = simple_strtoul(y, &e, 10);
612 if (y != e && year < 100) { /* 2-digit year */
613 year += 1900;
614 if (year < 1996) /* no dates < spec 1.0 */
615 year += 100;
617 if (year > 9999) /* year should fit in %04d */
618 year = 0;
620 /* parse the mm and dd */
621 month = simple_strtoul(s, &e, 10);
622 if (s == e || *e != '/' || !month || month > 12) {
623 month = 0;
624 goto out;
627 s = e + 1;
628 day = simple_strtoul(s, &e, 10);
629 if (s == y || s == e || *e != '/' || day > 31)
630 day = 0;
631 out:
632 if (yearp)
633 *yearp = year;
634 if (monthp)
635 *monthp = month;
636 if (dayp)
637 *dayp = day;
638 return exists;
640 EXPORT_SYMBOL(dmi_get_date);
643 * dmi_walk - Walk the DMI table and get called back for every record
644 * @decode: Callback function
645 * @private_data: Private data to be passed to the callback function
647 * Returns -1 when the DMI table can't be reached, 0 on success.
649 int dmi_walk(void (*decode)(const struct dmi_header *, void *),
650 void *private_data)
652 u8 *buf;
654 if (!dmi_available)
655 return -1;
657 buf = ioremap(dmi_base, dmi_len);
658 if (buf == NULL)
659 return -1;
661 dmi_table(buf, dmi_len, dmi_num, decode, private_data);
663 iounmap(buf);
664 return 0;
666 EXPORT_SYMBOL_GPL(dmi_walk);
669 * dmi_match - compare a string to the dmi field (if exists)
670 * @f: DMI field identifier
671 * @str: string to compare the DMI field to
673 * Returns true if the requested field equals to the str (including NULL).
675 bool dmi_match(enum dmi_field f, const char *str)
677 const char *info = dmi_get_system_info(f);
679 if (info == NULL || str == NULL)
680 return info == str;
682 return !strcmp(info, str);
684 EXPORT_SYMBOL_GPL(dmi_match);