diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index ff06c01..0b9baaf 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -502,6 +502,7 @@
 	{ USB_DEVICE(FTDI_VID, FTDI_ACG_HFDUAL_PID) },
 	{ USB_DEVICE(FTDI_VID, FTDI_YEI_SERVOCENTER31_PID) },
 	{ USB_DEVICE(FTDI_VID, FTDI_THORLABS_PID) },
+	{ USB_DEVICE(TESTO_VID, TESTO_USB_INTERFACE_PID) },
 	{ },					/* Optional parameter entry */
 	{ }					/* Terminating entry */
 };
diff --git a/drivers/usb/serial/ftdi_sio.h b/drivers/usb/serial/ftdi_sio.h
index 024e551..04ef90f 100644
--- a/drivers/usb/serial/ftdi_sio.h
+++ b/drivers/usb/serial/ftdi_sio.h
@@ -450,6 +450,13 @@
  */
 #define FTDI_THORLABS_PID		0xfaf0 /* ThorLabs USB motor drivers */
 
+/*
+ * Testo products (http://www.testo.com/)
+ * Submitted by Colin Leroy
+ */
+#define TESTO_VID			0x128D
+#define TESTO_USB_INTERFACE_PID		0x0001
+
 /* Commands */
 #define FTDI_SIO_RESET 		0 /* Reset the port */
 #define FTDI_SIO_MODEM_CTRL 	1 /* Set the modem control register */