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Bliss Touch Mapper (Input Mapper)

Touch Mapper binds USB touchscreens, mice, touchpads, and keyboards to specific displays. It can also flip inverted X/Y axes on mismatched digitizers. Included with --extras.

   
Settings UI Maps devices visually and can write input-port-addon.xml
Build Included with --extras
Hotplug DisplayMonitorService keeps bindings when monitors come and go

Map by vendor / product ID (slots 1 to 8)

Properties live under persist.ax86.* and survive reboot.

Touchscreens

adb shell setprop persist.ax86.touch.1.vendor "27c6"
adb shell setprop persist.ax86.touch.1.product "0118"
adb shell setprop persist.ax86.touch.1.display "local:1"
adb shell setprop persist.ax86.touch.1.orientation "0"
adb shell setprop persist.ax86.touch.1.flip_x "0"
adb shell setprop persist.ax86.touch.1.flip_y "1"

Other input types

Namespace Devices
persist.ax86.pointer.<SLOT>.* Mice / touchpads
persist.ax86.keyboard.<SLOT>.* Physical keyboards
persist.ax86.input.<SLOT>.* Generic inputs

Apply

Regenerate .idc files and refresh the input reader:

adb shell setprop sys.ax86.touch.update 1

Use pointer, keyboard, or input in place of touch when that is the namespace you changed.

Map by USB port (input-port-addon.xml)

When two devices share the same vendor/product ID (identical dual monitors, for example), map by USB topology instead.

Touch Mapper bind-mounts /data/misc/input-port-addon.xml over /vendor/etc/input-port-associations.xml at boot. The Settings UI can generate and save that file.

Step-by-step port discovery: Creating an input-port-addon.xml file.

Related IDC addon notes: Using IDC Addon.