Touchpad is not being detected properly in MSI-CX640

[sr229]

on ChromiumOS Special builds, it seems that Sentelic Touchpads are not supported.

CloudReady however properly detects this due to their Libinput support

chronos@localhost / $ evtest
No device specified, trying to scan all of /dev/input/event*
Not running as root, no devices may be available.
Available devices:
/dev/input/event0:      Lid Switch
/dev/input/event1:      Sleep Button
/dev/input/event2:      Power Button
/dev/input/event3:      Video Bus
/dev/input/event4:      AT Translated Set 2 keyboard
/dev/input/event5:      FSPPS/2 Sentelic FingerSensingPad
/dev/input/event6:      PC Speaker
/dev/input/event7:      HDA Intel PCH Mic
/dev/input/event8:      HDA Intel PCH Headphone
/dev/input/event9:      HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event10:     USB2.0 UVC 1.3M Webcam: USB2.0 
Select the device event number [0-10]: ^C

Consider adding Libinput support for special builds or support Sentelic touchpads.

[sr229]

If I do the same evtest in current ChromiumOS builds, the FingerSensingPad will be replaced with PS/2 Generic Mouse instead, btw.