- Arch Wiki with ton of info: https://wiki.archlinux.org/title/Map_scancodes_to_keycodes
- Default key mapping:
/usr/lib/udev/hwdb.d/60-keyboard.hwdb - Tool to manage low level mappings: https://github.com/philipl/evdevremapkeys (not used in this project)
Run lsusb to find your vendor and device ID.
ID 3243:0111 NORWII Norwii Wireless Presenter
Find out more about the device capabilities using evemu tools.
sudo evemu-describe /dev/input/by-id/usb-NORWII_Norwii_Wireless_Presenter-event-kbd
...
# Event code 15 (KEY_TAB)
# Event code 103 (KEY_UP)
# Event code 108 (KEY_DOWN)
...
For instance, this shows the event codes sent by the device.
Check if the device works and get the key codes we need to map.
sudo evtest /dev/input/by-id/usb-NORWII_Norwii_Wireless_Presenter-event-kbd
Event: time ..., type 4 (EV_MSC), code 4 (MSC_SCAN), value 70052
Event: time ..., type 1 (EV_KEY), code 103 (KEY_UP), value 1
...
Event: time ..., type 4 (EV_MSC), code 4 (MSC_SCAN), value 70051
Event: time ..., type 1 (EV_KEY), code 108 (KEY_DOWN), value 1
The pattern to match devices in udev hwdb is:
evdev:input:b<bus_id>v<vendor_id>p<product_id>e<version_id>-<modalias>
The USB bus ID is 0003 (see /usr/include/linux/input.h).
The vendor ID for Norwii is 3243.
The product ID is 0111.
The Norwii presenter can be matched with evdev:input:b0003v3243p0111*.
In a hwdb entry you can remap keys with KEYBOARD_KEY_<scancode>=<keycode>.
The entry for remapping the norwii is the following.
evdev:input:b0003v3243p0111*
KEYBOARD_KEY_70052=left # map [^] to LEFT
KEYBOARD_KEY_70051=right # map [v] to RIGHT
Put this to a new file /etc/udev/hwdb.d/90-norwii.hwdb.