Hi buddy
I know this is an old thread but i've got a S400CA and it's running El Captain 10.11.5. I have everything working on it except for mic...
I found a developer who made a driver for the touchscreen to so I don't have to buy touch-base driver for $200+
https://github.com/alexandred/VoodooI2C
Let me know if you're interested and i'll help, I may open a thread on here with my build and steps but need to patch my AppleHDA properly myself first to get mic working.