Cypress Gen3 APA Trackpad Driver for Acer C720, HP Chromebook 14 and Dell Chromebook 11.
Tested on Acer C720. HP Chromebook 14 and Dell Chromebook 11 users, feel free to modify the settings and send in pull requests with the right settings for your 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.