API for Setting Camera Exposure...

First off, I know that in order to access this API I will using the private APIs, and I've already done all the work to extract and use them. The problem I'm having now is I can't seem the find the API public or private that I can use to manually set the camera exposure. I'm about to the point where I'm going to start guessing and trying things until I find it, but wanted to post to check if someone out there might know