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dmi: Let drivers walk the DMI table 

Let drivers walk the DMI table for their own needs. Some drivers need
data stored in OEM-specific DMI records for proper operation.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
This commit is contained in:
Jean Delvare 2007-11-03 17:29:20 +01:00 committed by Mark M. Hoffman
parent df922075f2
commit 7fce084a0b
2 changed files with 51 additions and 14 deletions
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62
drivers/firmware/dmi_scan.c
View File

@ -43,18 +43,12 @@ static char * __init dmi_string(const struct dmi_header *dm, u8 s)
* We have to be cautious here. We have seen BIOSes with DMI pointers
* pointing to completely the wrong place for example
*/
static int __init dmi_table(u32 base, int len, int num,
void (*decode)(const struct dmi_header *))
static void dmi_table(u8 *buf, int len, int num,
void (*decode)(const struct dmi_header *))
{
u8 *buf, *data;
u8 *data = buf;
int i = 0;
buf = dmi_ioremap(base, len);
if (buf == NULL)
return -1;
data = buf;
/*
* Stop when we see all the items the table claimed to have
* OR we run off the end of the table (also happens)
@ -75,7 +69,23 @@ static int __init dmi_table(u32 base, int len, int num,
data += 2;
i++;
}
dmi_iounmap(buf, len);
}
static u32 dmi_base;
static u16 dmi_len;
static u16 dmi_num;
static int __init dmi_walk_early(void (*decode)(const struct dmi_header *))
{
u8 *buf;
buf = dmi_ioremap(dmi_base, dmi_len);
if (buf == NULL)
return -1;
dmi_table(buf, dmi_len, dmi_num, decode);
dmi_iounmap(buf, dmi_len);
return 0;
}
@ -291,9 +301,9 @@ static int __init dmi_present(const char __iomem *p)
memcpy_fromio(buf, p, 15);
if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
u16 num = (buf[13] << 8) | buf[12];
u16 len = (buf[7] << 8) | buf[6];
u32 base = (buf[11] << 24) | (buf[10] << 16) |
dmi_num = (buf[13] << 8) | buf[12];
dmi_len = (buf[7] << 8) | buf[6];
dmi_base = (buf[11] << 24) | (buf[10] << 16) |
(buf[9] << 8) | buf[8];
/*
@ -305,7 +315,7 @@ static int __init dmi_present(const char __iomem *p)
buf[14] >> 4, buf[14] & 0xF);
else
printk(KERN_INFO "DMI present.\n");
if (dmi_table(base,len, num, dmi_decode) == 0)
if (dmi_walk_early(dmi_decode) == 0)
return 0;
}
return 1;
@ -489,3 +499,27 @@ int dmi_get_year(int field)
return year;
}
/**
* dmi_walk - Walk the DMI table and get called back for every record
* @decode: Callback function
*
* Returns -1 when the DMI table can't be reached, 0 on success.
*/
int dmi_walk(void (*decode)(const struct dmi_header *))
{
u8 *buf;
if (!dmi_available)
return -1;
buf = ioremap(dmi_base, dmi_len);
if (buf == NULL)
return -1;
dmi_table(buf, dmi_len, dmi_num, decode);
iounmap(buf);
return 0;
}
EXPORT_SYMBOL_GPL(dmi_walk);

3
include/linux/dmi.h
View File

@ -79,6 +79,7 @@ extern void dmi_scan_machine(void);
extern int dmi_get_year(int field);
extern int dmi_name_in_vendors(const char *str);
extern int dmi_available;
extern int dmi_walk(void (*decode)(const struct dmi_header *));
#else
@ -89,6 +90,8 @@ static inline const struct dmi_device * dmi_find_device(int type, const char *na
static inline int dmi_get_year(int year) { return 0; }
static inline int dmi_name_in_vendors(const char *s) { return 0; }
#define dmi_available 0
static inline int dmi_walk(void (*decode)(const struct dmi_header *))
{ return -1; }
#endif