Cypress Gen3 APA Trackpad Driver for Acer C720, HP Chromebook 14, Dell Chromebook 11 and Toshiba Chromebook 1.
Tested and verified on Acer C720 chromebook.
Huge thanks to the vmulti and DragonFlyBSD projects, which I used for references. Also, thanks to Microsoft for open sourcing the Synaptics RMI I2C driver, which I also used as a reference.