Staging: add Support for Quatech ESU2-100 USB 2.0 8-port serial adaptor

The patch is of the "works as far as it goes" variety, in that the
module compiles and loads, the device nodes are registered and the unit
switched on, but nothing actually works. On the other hand, it doesn't
panic the kernel, as far as I know.
Signed-off-by: Richard Ash <richard@audacityteam.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/Kconfig

@@ -121,6 +121,8 @@ source "drivers/staging/octeon/Kconfig"
 
 source "drivers/staging/serqt_usb2/Kconfig"
 
+source "drivers/staging/quatech_usb2/Kconfig"
+
 source "drivers/staging/vt6655/Kconfig"
 
 source "drivers/staging/vt6656/Kconfig"

drivers/staging/Makefile

@@ -41,6 +41,7 @@ obj-$(CONFIG_PLAN9AUTH)		+= p9auth/
 obj-$(CONFIG_HECI)		+= heci/
 obj-$(CONFIG_LINE6_USB)		+= line6/
 obj-$(CONFIG_USB_SERIAL_QUATECH2)	+= serqt_usb2/
+obj-$(CONFIG_USB_SERIAL_QUATECH_USB2)	+= quatech_usb2/
 obj-$(CONFIG_OCTEON_ETHERNET)	+= octeon/
 obj-$(CONFIG_VT6655)		+= vt6655/
 obj-$(CONFIG_VT6656)		+= vt6656/

drivers/staging/quatech_usb2/Kconfig

+config USB_SERIAL_QUATECH_USB2
+	tristate "USB Quatech xSU2-[14]00 USB Serial Driver"
+	depends on USB_SERIAL
+	help
+	  Say Y here if you want to use a Quatech USB2.0 to serial adaptor. This
+	  driver supports the SSU2-100, DSU2-100, DSU2-400, QSU2-100, QSU2-400,
+	  ESU2-400 and ESU2-100 USB2.0 to RS232 / 485 / 422 serial adaptors.
+
+	  Some hardware has an incorrect product string and announces itself as
+	  ESU-100 (which uses the serqt driver) even though it is an ESU2-100.
+	  Check the label on the bottom of your device.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called quatech_usb2 .
+

drivers/staging/quatech_usb2/Makefile

+obj-$(CONFIG_USB_SERIAL_QUATECH_USB2)		+= quatech_usb2.o