Well what I did to reverse-engineer the settings was just a bunch of printk()'s of the hex and binary values in the state_write() function. Yeah, I think it'd be nice to have the ability to read it off the display so I can maybe get a read on what the in-car (tuner-related) settings are. It'd be nice if we could figure out what all the bits mean just for completeness. I guess you wouldn't have room on the display for binary, just hex, but that's okay. What I actually did in my kernel was write it so that if the value in a particular byte changed, it was highlighted (in ANSI color) so I could easily see which bytes were changing in between writes. If it's trivial, maybe doing the same for the VFD readout would be nice.