A little more information after looking around a bit.
The linux [1] and freebsd [2] drivers accept all elantech touchpads
with ic types from 6 up to 15 as using the v4 protocol.
The following patch extends the accepted ic types to that
range (from the current set consisting of 6, 8, and 15).
I
Hi,
The change below adds ic type 13 as an elantech v4 device and causes
the touchpad in a thinkpad x380 yoga to work as described in wsmouse(4).
Two finger scrolling works and the three mouse button areas are defined
as described. Before the touchpad and trackpoint were attached as a
single
