It seems a lot of different laptops has a cypress PS2 trackpad (not only Dell XPS 13/15/15z). So I'm opening here a new thread.
I Have a XPS L322x 13, which has a cypress trackpad on it, I build my own kext and implemented the trackpad protocol into rehabman VoodooPS2Controller to get it working
For now, it is still under dev, but seems to be crash free, features are really basic and mouse behaviour "primitive", but have a tap to click implementation and and a two fingers scroll.
You can check the source at :
You can download a "release" (no debug) version on the homepage.
Will update it soon, when i would have time (maybe this week end).
Best regards to all,