NAME

       touchpad-edge-detector - print the axis ranges for a touchpad device

SYNOPSIS

       touchpad-edge-detector [--help] WxH /dev/input/eventX

DESCRIPTION

       The  touchpad-edge-detector  tool  reads  touchpad  events from the kernel and records the
       minimum and maximum coordinates based on user input. This is an interactive tool, the user
       must move a finger around the touchpad, attempting to trigger an event at all edges of the
       touchpad.

       To terminate the event collection and print a summary, press  Ctrl+C.  It  is  recommended
       that the tool is run several times to guarantee a reliable result.

OPTIONS

       WxH     The  width  and  height  of the touchpad in mm. For a touchpad 100mm wide and 75mm
               high, the argument is thus 100x75. This is a required argument.

       /dev/input/eventX
               The event node of the touchpad to read events from. A list of possible event nodes
               can be obtained with either one of the following commands: libinput record, evemu-
               record, or evtest. Alternatively the event node for a  device  is  listed  in  the
               Handlers= line /proc/bus/input/devices.  This is a required argument.

       --help  Print a short help description

NOTES

       On  completion,  this  tool  prints a summary of the collected events and a suggested udev
       rule. Due to rounding errors it  is  rare  to  get  an  exact  match  for  the  touchpad's
       dimensions,  but  any  discrepancy of more than 5mm should be corrected with the suggested
       udev rule.

       The udev rule should be  simplified  and  submitted  as  a  pull  request  to  the  system
       repository  at  https://github.com/systemd/systemd.  For  further  guidance,  see the file
       /usr/lib/udev/hwdb.d/60-evdev.hwdb.

SEE ALSO

       udev(7)

                                                                        TOUCHPAD-EDGE-DETECTOR(1)