I'm sorry, I've no experience with compiling a driver for Linux.
Q: When I plug in the USB device without even using it, should
ftdi_sio and usbserial remain loaded after I unplug the USB device?
Quoting Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>:
The existence of /dev/ttyUSB0 depends on the system:
* RPi with Raspbian: /dev/ttyUSB0 never goes away after step 4.
* RPi with Debian6, BBXM: /dev/ttyUSB0 goes away after step 4 and
comes back after step 6.
Thats dependant upon your user space and really nothing to do with this
Are there any commands I can run to provide you with more information?
As I said...
> If you think that if check is the problem can you replace it with an
> unconditional call to change_speed(tty, port) and the re-test. That will
> confirm if it is the cause.
Alan
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