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Message-ID: <20080125214149.57a6e954@hyperion.delvare>
Date: Fri, 25 Jan 2008 21:41:49 +0100
From: Jean Delvare <khali@...ux-fr.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Hans de Goede <j.w.r.degoede@....nl>,
Lennart Poettering <mzxreary@...inter.de>,
Kay Sievers <kay.sievers@...y.org>
Subject: [PATCH] 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@...ux-fr.org>
---
Updated to apply cleanly on top of 2.6.24.
drivers/firmware/dmi_scan.c | 61 +++++++++++++++++++++++++++++++++----------
include/linux/dmi.h | 3 ++
2 files changed, 50 insertions(+), 14 deletions(-)
--- linux-2.6.24-rc5.orig/drivers/firmware/dmi_scan.c 2007-12-12 12:36:34.000000000 +0100
+++ linux-2.6.24-rc5/drivers/firmware/dmi_scan.c 2007-12-18 14:27:28.000000000 +0100
@@ -36,18 +36,12 @@ static char * __init dmi_string(const st
* 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)
@@ -68,7 +62,23 @@ static int __init dmi_table(u32 base, in
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;
}
@@ -273,9 +283,9 @@ static int __init dmi_present(const char
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];
/*
@@ -287,7 +297,7 @@ static int __init dmi_present(const char
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;
@@ -470,3 +480,26 @@ 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);
--- linux-2.6.24-rc5.orig/include/linux/dmi.h 2007-12-12 12:36:34.000000000 +0100
+++ linux-2.6.24-rc5/include/linux/dmi.h 2007-12-18 14:27:28.000000000 +0100
@@ -78,6 +78,7 @@ extern const struct dmi_device * dmi_fin
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_walk(void (*decode)(const struct dmi_header *));
#else
@@ -87,6 +88,8 @@ static inline const struct dmi_device *
const struct dmi_device *from) { return NULL; }
static inline int dmi_get_year(int year) { return 0; }
static inline int dmi_name_in_vendors(const char *s) { return 0; }
+static inline int dmi_walk(void (*decode)(const struct dmi_header *))
+ { return -1; }
#endif
--
Jean Delvare
--
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