Mouse is absolute, and therefore pretty useless, maybe use EV_REL instead?

[hacker1024]

From the linux input documentation:

In addition to EV_KEY, there are two more basic event types: EV_REL and
EV_ABS. They are used for relative and absolute values supplied by the
device. A relative value may be for example a mouse movement in the X axis.
The mouse reports it as a relative difference from the last position,
because it doesn't have any absolute coordinate system to work in. Absolute
events are namely for joysticks and digitizers - devices that do work in an
absolute coordinate systems.

Having the device report EV_REL buttons is as simple as with EV_KEY, simply
set the corresponding bits and call the

input_report_rel(struct input_dev *dev, int code, int value)

function. Events are generated only for nonzero value.