USB: add USB serial ssu100 driver

Add support for the Quatech SSU-100 single port usb to serial device.
This driver is based on the ftdi_sio.c driver and the original
serqt_usb driver from Quatech.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index bd8aab0..916b2b6 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -642,6 +642,15 @@
 	  To compile this driver as a module, choose M here: the
 	  module will be called zio.
 
+config USB_SERIAL_SSU100
+	tristate "USB Quatech SSU-100 Single Port Serial Driver"
+	help
+	  Say Y here if you want to use the Quatech SSU-100 single
+	  port usb to serial adapter.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ssu100.
+
 config USB_SERIAL_DEBUG
 	tristate "USB Debugging Device"
 	help