I have a touchscreen made by AUO. It came with a driver which I have
written a recipe for and it seems to be compiling and when the
touchscreen is detected, the driver seems to be loading and
controlling the touchscreen. (Its not under the control of hid_core
driver).

It shows up in /proc/bus/input/devices

I: Bus=0003 Vendor=03eb Product=201c Version=1503
N: Name="pixcir_hid_mt_v2.0"
P: Phys=
S: Sysfs=/devices/pci0000:00/0000:00:17.0/0000:01:00.0/0000:02:02.0/usb3/3-1/3-1:1.0/input/input4
U: Uniq=
H: Handlers=mouse0
B: PROP=0
B: EV=b
B: KEY=400 0 0 0 0 0 0 0 0 0 0
B: ABS=650000 3

It shows up as /dev/input/mouse0