--- linux-2.6.18.i686/drivers/usb/serial/ftdi_sio.h	2010-08-30 12:11:31.000000000 -0700
+++ linux-2.6.18.i686/drivers/usb/serial/ftdi_sio.h.new	2010-08-30 12:12:48.000000000 -0700
@@ -472,6 +472,13 @@
  */
 #define FTDI_GAMMA_SCOUT_PID		0xD678	/* Gamma Scout online */
 
+/*
+ * US Interface Navigator (http://www.usinterface.com/). Submitted by dranch@trinnet.net
+ */
+#define FTDI_USINT_CAT_PID		0xB810	/* US Interface Navigator CAT and 2nd PTT lines */
+#define FTDI_USINT_WKEY_PID		0xB811	/* US Interface Navigator WKEY and FSK lines */
+#define FTDI_USINT_RS232_PID		0xB812	/* US Interface Navigator RS232 and CONFIG lines */
+
 /* Commands */
 #define FTDI_SIO_RESET 		0 /* Reset the port */
 #define FTDI_SIO_MODEM_CTRL 	1 /* Set the modem control register */
--- linux-2.6.18.i686/drivers/usb/serial/ftdi_sio.c	2010-08-30 12:11:37.000000000 -0700
+++ linux-2.6.18.i686/drivers/usb/serial/ftdi_sio.c.new	2010-08-30 12:12:55.000000000 -0700
@@ -507,6 +507,9 @@
 	{ USB_DEVICE(FTDI_VID, FTDI_THORLABS_PID) },
 	{ USB_DEVICE(TESTO_VID, TESTO_USB_INTERFACE_PID) },
 	{ USB_DEVICE(FTDI_VID, FTDI_GAMMA_SCOUT_PID) },
+	{ USB_DEVICE(FTDI_VID, FTDI_USINT_CAT_PID) },
+	{ USB_DEVICE(FTDI_VID, FTDI_USINT_WKEY_PID) },
+	{ USB_DEVICE(FTDI_VID, FTDI_USINT_RS232_PID) },
 	{ },					/* Optional parameter entry */
 	{ }					/* Terminating entry */
 };