[PATCH] USB: ftdi_sio: Add support for HCG HF Dual ISO RFID Reader

This patch adds support for ACG Identification Technologies GmbH's HF
Dual ISO Reader (an RFID tag reader) to the ftdi_sio driver's device ID
table.  The product ID was supplied by anotonios (anton at goto10 dot
org) on the ftdi-usb-sio-devel list and subsequently verified by myself
(Ian Abbott).

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/ftdi_sio.h b/drivers/usb/serial/ftdi_sio.h
index 2c55a5e..3e4123f 100644
--- a/drivers/usb/serial/ftdi_sio.h
+++ b/drivers/usb/serial/ftdi_sio.h
@@ -426,6 +426,11 @@
 #define PAPOUCH_VID			0x5050	/* Vendor ID */
 #define PAPOUCH_TMU_PID			0x0400	/* TMU USB Thermometer */
 
+/*
+ * ACG Identification Technologies GmbH products (http://www.acg.de/).
+ * Submitted by anton -at- goto10 -dot- org.
+ */
+#define FTDI_ACG_HFDUAL_PID		0xDD20	/* HF Dual ISO Reader (RFID) */
 
 /* Commands */
 #define FTDI_SIO_RESET 		0 /* Reset the port */