/**
@page udev_config Static device configuration via udev

libinput supports some static configuration through udev properties.
These properties are read when the device is initially added
to libinput's device list, i.e. before the @ref
LIBINPUT_EVENT_DEVICE_ADDED event is generated.

The following udev properties are supported:
<dl>
<dt>LIBINPUT_CALIBRATION_MATRIX</dt>
<dd>Sets the calibration matrix, see
libinput_device_config_calibration_get_default_matrix(). If unset,
defaults to the identity matrix.</dd>
<dt>LIBINPUT_DEVICE_GROUP</dt>
<dd>A string identifying the @ref libinput_device_group for this device. Two
devices with the same property value are grouped into the same device group,
the value itself is irrelevant otherwise.
</dd>
<dt>ID_SEAT</dt>
<dd>Assigns the physical seat for this device. See
libinput_seat_get_physical_name(). Defaults to "seat0".</dd>
<dt>WL_SEAT</dt>
<dd>Assigns the logical seat for this device. See
libinput_seat_get_logical_name()
context. Defaults to "default".</dd>
<dt>MOUSE_DPI</dt>
<dd>HW resolution and sampling frequency of a relative pointer device.
See @ref motion_normalization for details.
</dd>
<dt>MOUSE_WHEEL_CLICK_ANGLE</dt>
<dd>The angle in degrees for each click on a mouse wheel. See
libinput_pointer_get_axis_source() for details.
</dd>
</dl>

Below is an example udev rule to assign "seat1" to a device from vendor
0x012a with the model ID of 0x034b.
@code
ACTION=="add|change", KERNEL=="event[0-9]*", ENV{ID_VENDOR_ID}=="012a", \
ENV{ID_MODEL_ID}=="034b", ENV{ID_SEAT}="seat1"
@endcode

*/