[PATCH] export DMI check functions

This patch creates and exports 2 functions which can be used by the rest of
kernel code to perform DMI data checks:

- dmi_check_system() function checks system DMI data against given blacklist
  table and on each match runs corresponding callback function;

- dmi_get_system_info() function returns DMI data value.  Useful for people
  wanting more complex DMI data check than simple string match.

Also filling unused match entries with NO_MATCH made optional, but existing
NO_MATCH occurences are left intact, so people are free to continue dmi_scan.c
patching without massive reject problems.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/dmi_scan.c

@@ -10,6 +10,7 @@
 #include <asm/io.h>
 #include <linux/pm.h>
 #include <asm/system.h>
+#include <linux/dmi.h>
 #include <linux/bootmem.h>
 
 unsigned long dmi_broken;
@@ -139,21 +140,6 @@ static int __init dmi_iterate(void (*decode)(struct dmi_header *))
 	return -1;
 }
 
-
-enum
-{
-	DMI_BIOS_VENDOR,
-	DMI_BIOS_VERSION,
-	DMI_BIOS_DATE,
-	DMI_SYS_VENDOR,
-	DMI_PRODUCT_NAME,
-	DMI_PRODUCT_VERSION,
-	DMI_BOARD_VENDOR,
-	DMI_BOARD_NAME,
-	DMI_BOARD_VERSION,
-	DMI_STRING_MAX
-};
-
 static char *dmi_ident[DMI_STRING_MAX];
 
 /*
@@ -176,26 +162,11 @@ static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
 }
 
 /*
- *	DMI callbacks for problem boards
+ * Ugly compatibility crap.
  */
-
-struct dmi_strmatch
-{
-	u8 slot;
-	char *substr;
-};
-
-#define NONE	255
-
-struct dmi_blacklist
-{
-	int (*callback)(struct dmi_blacklist *);
-	char *ident;
-	struct dmi_strmatch matches[4];
-};
-
-#define NO_MATCH	{ NONE, NULL}
-#define MATCH(a,b)	{ a, b }
+#define dmi_blacklist	dmi_system_id
+#define NO_MATCH	{ DMI_NONE, NULL}
+#define MATCH		DMI_MATCH
 
 /* 
  * Reboot options and system auto-detection code provided by
@@ -1054,9 +1025,6 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 
 static __init void dmi_check_blacklist(void)
 {
-	struct dmi_blacklist *d;
-	int i;
-		
 #ifdef	CONFIG_ACPI_BOOT
 #define	ACPI_BLACKLIST_CUTOFF_YEAR	2001
 
@@ -1078,25 +1046,7 @@ static __init void dmi_check_blacklist(void)
 		}
 	}
 #endif
-
-	d=&dmi_blacklist[0];
-	while(d->callback)
-	{
-		for(i=0;i<4;i++)
-		{
-			int s = d->matches[i].slot;
-			if(s==NONE)
-				continue;
-			if(dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
-				continue;
-			/* No match */
-			goto fail;
-		}
-		if(d->callback(d))
-			return;
-fail:			
-		d++;
-	}
+ 	dmi_check_system(dmi_blacklist);
 }
 
 	
@@ -1163,3 +1113,52 @@ void __init dmi_scan_machine(void)
 }
 
 EXPORT_SYMBOL(is_unsafe_smbus);
+
+
+/**
+ *	dmi_check_system - check system DMI data
+ *	@list: array of dmi_system_id structures to match against
+ *
+ *	Walk the blacklist table running matching functions until someone
+ *	returns non zero or we hit the end. Callback function is called for
+ *	each successfull match. Returns the number of matches.
+ */
+int dmi_check_system(struct dmi_system_id *list)
+{
+	int i, count = 0;
+	struct dmi_system_id *d = list;
+
+	while (d->ident) {
+		for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
+			int s = d->matches[i].slot;
+			if (s == DMI_NONE)
+				continue;
+			if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
+				continue;
+			/* No match */
+			goto fail;
+		}
+		if (d->callback && d->callback(d))
+			break;
+		count++;
+fail:		d++;
+	}
+
+	return count;
+}
+
+EXPORT_SYMBOL(dmi_check_system);
+
+/**
+ *	dmi_get_system_info - return DMI data value
+ *	@field: data index (see enum dmi_filed)
+ *
+ *	Returns one DMI data value, can be used to perform
+ *	complex DMI data checks.
+ */
+char * dmi_get_system_info(int field)
+{
+	return dmi_ident[field];
+}
+
+EXPORT_SYMBOL(dmi_get_system_info);

include/linux/dmi.h

+#ifndef __DMI_H__
+#define __DMI_H__
+
+enum dmi_field {
+	DMI_NONE,
+	DMI_BIOS_VENDOR,
+	DMI_BIOS_VERSION,
+	DMI_BIOS_DATE,
+	DMI_SYS_VENDOR,
+	DMI_PRODUCT_NAME,
+	DMI_PRODUCT_VERSION,
+	DMI_BOARD_VENDOR,
+	DMI_BOARD_NAME,
+	DMI_BOARD_VERSION,
+	DMI_STRING_MAX,
+};
+
+/*
+ *	DMI callbacks for problem boards
+ */
+struct dmi_strmatch {
+	u8 slot;
+	char *substr;
+};
+
+struct dmi_system_id {
+	int (*callback)(struct dmi_system_id *);
+	char *ident;
+	struct dmi_strmatch matches[4];
+	void *driver_data;
+};
+
+#define DMI_MATCH(a,b)	{ a, b }
+
+#if defined(CONFIG_X86) && !defined(CONFIG_X86_64)
+
+extern int dmi_check_system(struct dmi_system_id *list);
+extern char * dmi_get_system_info(int field);
+
+#else
+
+static inline int dmi_check_system(struct dmi_system_id *list) { return 0; }
+static inline char * dmi_get_system_info(int field) { return NULL; }
+
+#endif
+
+#endif	/* __DMI_H__ */