Support Samsung SE-S084 USB DVD drive (and probably many others)

A full implementation of ATAPI USB support would need to translate / filter
certain package types or some devices might not work. No previously working
devices break with the patch, so it is fine to commit.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
diff --git a/src/usb-msc.c b/src/usb-msc.c
index 52fb58a..968cae3 100644
--- a/src/usb-msc.c
+++ b/src/usb-msc.c
@@ -182,7 +182,9 @@
         return -1;
 
     // Verify right kind of device
-    if (iface->bInterfaceSubClass != US_SC_SCSI
+    if ((iface->bInterfaceSubClass != US_SC_SCSI &&
+	 iface->bInterfaceSubClass != US_SC_ATAPI_8070 &&
+	 iface->bInterfaceSubClass != US_SC_ATAPI_8020)
         || iface->bInterfaceProtocol != US_PR_BULK) {
         dprintf(1, "Unsupported MSC USB device (subclass=%02x proto=%02x)\n"
                 , iface->bInterfaceSubClass, iface->bInterfaceProtocol);
diff --git a/src/usb-msc.h b/src/usb-msc.h
index 467ccf3..71adb20 100644
--- a/src/usb-msc.h
+++ b/src/usb-msc.h
@@ -15,9 +15,11 @@
  * MSC flags
  ****************************************************************/
 
-#define US_SC_SCSI      0x06
+#define US_SC_ATAPI_8020   0x02
+#define US_SC_ATAPI_8070   0x05
+#define US_SC_SCSI         0x06
 
-#define US_PR_BULK      0x50
+#define US_PR_BULK         0x50
 
 #define USB_MSC_TYPE_DISK  0x00
 #define USB_MSC_TYPE_CDROM 0x05