This is a simple USB driver based on the code examples and instructions in Linux Device Drivers chapter 13.
When plugging in (almost) any USB device that device is by default handled by some builtin kernel module like usbhid, usb_storage,etc. In order to get this module to handle the device you must re-bind it to this module:
Fetch the name for the plugged in USB device
tree /sys/bus/usb/devices/
You may have to unplug and plug in the devices and run the above command a few times in order to find the correct name. The name should be in the format x-x:x.x
To find out what driver module is used for the current USB device use
usb-devices
Probably it will be usbhid
Unbind it from the current module
echo -n "x-x:x.x" > /sys/bus/usb/drivers/{DRIVER}/unbind
Bind it to this module
echo -n "x-x:x.x" > /sys/bus/usb/drivers/usb-test/bind
Verify with dmesg that the probe function in this module is reached
dmesg