CST816 Registers for T-Display-S3 Touch

[Brekel]

Does anyone have a link to a complete datasheet, or other information on the CST816 controller including its control & data registers?
I've seen several datasheets. Some don't mention the registers at all, others have a page titled "4. REGISTERS" but the page is blank.
The touch library in the Lilygo github repository works for the basics, but the inbuilt gestures don't work. But another library I've tried does read the gestures from the controller.

The REG/CSTMutualConstants.h file in the Lilygo library has a list, but some of the comments are a bit vague and some don't line up with other libraries.

If I had the full datasheet I could explore it's full possibilities, but the information seems a bit elusive