[PATCH] dmi: add onboard devices discovery

This patch adds onboard devices and IPMI BMC discovery into DMI scan code.
Drivers can use dmi_find_device() function to search for devices by type and
name.

Signed-off-by: Andrey Panin <pazke@donpac.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 123 insertions, 15 deletions

diff --git a/arch/i386/kernel/dmi_scan.c b/arch/i386/kernel/dmi_scan.c
index ae1a1aed2fc0..c4a73855e38c 100644
--- a/arch/i386/kernel/dmi_scan.c
+++ b/arch/i386/kernel/dmi_scan.c
@@ -6,13 +6,6 @@
 #include <linux/bootmem.h>
 
 
-struct dmi_header {
-        u8 type;
-        u8 length;
-        u16 handle;
-};
-
-
 static char * __init dmi_string(struct dmi_header *dm, u8 s)
 {
         u8 *bp = ((u8 *) dm) + dm->length;
@@ -88,6 +81,7 @@ static int __init dmi_checksum(u8 *buf)
 }
 
 static char *dmi_ident[DMI_STRING_MAX];
+static LIST_HEAD(dmi_devices);
 
 /*
  *      Save a DMI string
@@ -106,6 +100,58 @@ static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
         dmi_ident[slot] = p;
 }
 
+static void __init dmi_save_devices(struct dmi_header *dm)
+{
+        int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
+        struct dmi_device *dev;
+
+        for (i = 0; i < count; i++) {
+                char *d = ((char *) dm) + (i * 2);
+
+                /* Skip disabled device */
+                if ((*d & 0x80) == 0)
+                        continue;
+
+                dev = alloc_bootmem(sizeof(*dev));
+                if (!dev) {
+                        printk(KERN_ERR "dmi_save_devices: out of memory.\n");
+                        break;
+                }
+
+                dev->type = *d++ & 0x7f;
+                dev->name = dmi_string(dm, *d);
+                dev->device_data = NULL;
+
+                list_add(&dev->list, &dmi_devices);
+        }
+}
+
+static void __init dmi_save_ipmi_device(struct dmi_header *dm)
+{
+        struct dmi_device *dev;
+        void * data;
+
+        data = alloc_bootmem(dm->length);
+        if (data == NULL) {
+                printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
+                return;
+        }
+
+        memcpy(data, dm, dm->length);
+
+        dev = alloc_bootmem(sizeof(*dev));
+        if (!dev) {
+                printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
+                return;
+        }
+
+        dev->type = DMI_DEV_TYPE_IPMI;
+        dev->name = "IPMI controller";
+        dev->device_data = data;
+
+        list_add(&dev->list, &dmi_devices);
+}
+
 /*
  *      Process a DMI table entry. Right now all we care about are the BIOS
  *      and machine entries. For 2.5 we should pull the smbus controller info
@@ -113,25 +159,28 @@ static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
  */
 static void __init dmi_decode(struct dmi_header *dm)
 {
-        u8 *data __attribute__((__unused__)) = (u8 *)dm;
-        
         switch(dm->type) {
-        case  0:
+        case 0:         /* BIOS Information */
                 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
                 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
                 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
                 break;
-        case 1:
+        case 1:         /* System Information */
                 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
                 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
                 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
                 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
                 break;
-        case 2:
+        case 2:         /* Base Board Information */
                 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
                 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
                 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
                 break;
+        case 10:        /* Onboard Devices Information */
+                dmi_save_devices(dm);
+                break;
+        case 38:        /* IPMI Device Information */
+                dmi_save_ipmi_device(dm);
         }
 }
 
@@ -221,3 +270,32 @@ char *dmi_get_system_info(int field)
         return dmi_ident[field];
 }
 EXPORT_SYMBOL(dmi_get_system_info);
+
+/**
+ *      dmi_find_device - find onboard device by type/name
+ *      @type: device type or %DMI_DEV_TYPE_ANY to match all device types
+ *      @desc: device name string or %NULL to match all
+ *      @from: previous device found in search, or %NULL for new search.
+ *
+ *      Iterates through the list of known onboard devices. If a device is
+ *      found with a matching @vendor and @device, a pointer to its device
+ *      structure is returned.  Otherwise, %NULL is returned.
+ *      A new search is initiated by passing %NULL to the @from argument.
+ *      If @from is not %NULL, searches continue from next device.
+ */
+struct dmi_device * dmi_find_device(int type, const char *name,
+                                    struct dmi_device *from)
+{
+        struct list_head *d, *head = from ? &from->list : &dmi_devices;
+
+        for(d = head->next; d != &dmi_devices; d = d->next) {
+                struct dmi_device *dev = list_entry(d, struct dmi_device, list);
+
+                if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
+                    ((name == NULL) || (strcmp(dev->name, name) == 0)))
+                        return dev;
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL(dmi_find_device);
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index 5e93e6dce9a4..c30175e8dec6 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -1,6 +1,8 @@
 #ifndef __DMI_H__
 #define __DMI_H__
 
+#include <linux/list.h>
+
 enum dmi_field {
         DMI_NONE,
         DMI_BIOS_VENDOR,
@@ -16,6 +18,24 @@ enum dmi_field {
         DMI_STRING_MAX,
 };
 
+enum dmi_device_type {
+        DMI_DEV_TYPE_ANY = 0,
+        DMI_DEV_TYPE_OTHER,
+        DMI_DEV_TYPE_UNKNOWN,
+        DMI_DEV_TYPE_VIDEO,
+        DMI_DEV_TYPE_SCSI,
+        DMI_DEV_TYPE_ETHERNET,
+        DMI_DEV_TYPE_TOKENRING,
+        DMI_DEV_TYPE_SOUND,
+        DMI_DEV_TYPE_IPMI = -1
+};
+
+struct dmi_header {
+        u8 type;
+        u8 length;
+        u16 handle;
+};
+
 /*
  *      DMI callbacks for problem boards
  */
@@ -26,22 +46,32 @@ struct dmi_strmatch {
 
 struct dmi_system_id {
         int (*callback)(struct dmi_system_id *);
-        char *ident;
+        const char *ident;
         struct dmi_strmatch matches[4];
         void *driver_data;
 };
 
-#define DMI_MATCH(a,b)  { a, b }
+#define DMI_MATCH(a, b) { a, b }
+
+struct dmi_device {
+        struct list_head list;
+        int type;
+        const char *name;
+        void *device_data;      /* Type specific data */
+};
 
 #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);
-
+extern struct dmi_device * dmi_find_device(int type, const char *name,
+        struct dmi_device *from);
 #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; }
+static struct dmi_device * dmi_find_device(int type, const char *name,
+        struct dmi_device *from) { return NULL; }
 
 #endif