[PATCH] DMI: Decode and save OEM String information

This teaches dmi_decode() how to decode and save OEM Strings (type 11) DMI
information, which is currently discarded silently.  Existing code using
DMI is not affected.  Follows the "System Management BIOS (SMBIOS)
Specification" (http://www.dmtf.org/standards/smbios), and also the
userspace dmidecode.c code.

OEM Strings are the only safe way to identify some hardware, e.g., the
ThinkPad embedded controller used by the soon-to-be-submitted tp_smapi
driver.  This will also let us eliminate the long whitelist in the mainline
hdaps driver (in a future patch).

Signed-off-by: Shem Multinymous <multinymous@gmail.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 25 insertions, 1 deletions

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index b9e3886d9e16..b8b596d5778d 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -123,6 +123,26 @@ static void __init dmi_save_devices(struct dmi_header *dm)
                 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_oem_strings_devices(struct dmi_header *dm)
+{
+        int i, count = *(u8 *)(dm + 1);
+        struct dmi_device *dev;
+
+        for (i = 1; i <= count; i++) {
+                dev = dmi_alloc(sizeof(*dev));
+                if (!dev) {
+                        printk(KERN_ERR
+                           "dmi_save_oem_strings_devices: out of memory.\n");
+                        break;
+                }
+
+                dev->type = DMI_DEV_TYPE_OEM_STRING;
+                dev->name = dmi_string(dm, i);
+                dev->device_data = NULL;
 
                 list_add(&dev->list, &dmi_devices);
         }
@@ -181,6 +201,9 @@ static void __init dmi_decode(struct dmi_header *dm)
         case 10:        /* Onboard Devices Information */
                 dmi_save_devices(dm);
                 break;
+        case 11:        /* OEM Strings */
+                dmi_save_oem_strings_devices(dm);
+                break;
         case 38:        /* IPMI Device Information */
                 dmi_save_ipmi_device(dm);
         }
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index b2cd2071d432..38dc403be70b 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -27,7 +27,8 @@ enum dmi_device_type {
         DMI_DEV_TYPE_ETHERNET,
         DMI_DEV_TYPE_TOKENRING,
         DMI_DEV_TYPE_SOUND,
-        DMI_DEV_TYPE_IPMI = -1
+        DMI_DEV_TYPE_IPMI = -1,
+        DMI_DEV_TYPE_OEM_STRING = -2
 };
 
 struct dmi_header {