Debian, unable to detect mysensors on USB

[l0gic]

Guys,
I'm using Domoticz on a Pi at the moment but as I'm in the process of setting up zomeminder on Debian I thought I'd swing over Domoticz at the same time.
Installed domoticz fine, RFX433 appears when I plug it in - all good.

However, I'm using a arduino nano as my mysensors gateway and I'm not picking it up.
Now the serial chip on the arduino is a CH340G and as such as a cheap chinese clone.
It works fine with Raspian but fails with Debian.

I'm confused as to whether the driver is pre installed (lots of people seem to think it is) but a "whereris ch340.c" turns up nothing.
I've tried various CH340 drivers out there but the make always fails, see below;

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make -C /lib/modules/3.16.0-4-amd64/build  M=/home/kevin/usbdrivers
make[1]: Entering directory '/usr/src/linux-headers-3.16.0-4-amd64'
make[1]: Entering directory `/usr/src/linux-headers-3.16.0-4-amd64'
  LD      /home/kevin/usbdrivers/built-in.o
  CC [M]  /home/kevin/usbdrivers/ch34x.o
/home/kevin/usbdrivers/ch34x.c: In function ‘wait_modem_info’:
/home/kevin/usbdrivers/ch34x.c:756:3: error: implicit declaration of function ‘interruptible_sleep_on’ [-Werror=implicit-function-declaration]
   interruptible_sleep_on( &priv->delta_msr_wait );
   ^
cc1: some warnings being treated as errors
/usr/src/linux-headers-3.16.0-4-common/scripts/Makefile.build:268: recipe for target '/home/kevin/usbdrivers/ch34x.o' failed
make[4]: *** [/home/kevin/usbdrivers/ch34x.o] Error 1
/usr/src/linux-headers-3.16.0-4-common/Makefile:1353: recipe for target '_module_/home/kevin/usbdrivers' failed
make[3]: *** [_module_/home/kevin/usbdrivers] Error 2
Makefile:181: recipe for target 'sub-make' failed
make[2]: *** [sub-make] Error 2
Makefile:8: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-3.16.0-4-amd64'
Makefile:5: recipe for target 'default' failed
make: *** [default] Error 2

Anyone come across this or give me a definitive statement on the driver already being available.

Plugging in the arduino gives me the following in the kernel logs (dmesg | tail -f)

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[86441.702336] usb 3-1: new full-speed USB device number 10 using xhci_hcd
[86441.831356] usb 3-1: New USB device found, idVendor=1a86, idProduct=7523
[86441.831359] usb 3-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[86441.831360] usb 3-1: Product: USB2.0-Serial
[86441.838435] usbcore: registered new interface driver ch341
[86441.838449] usbserial: USB Serial support registered for ch341-uart
[86441.838458] ch341 3-1:1.0: ch341-uart converter detected
[86441.839252] ch341-uart: probe of ttyUSB0 failed with error -71

Any pointers would be appreciated

Cheers

Kevin