Correct gpiomask and muxsel

[Fabio Roger <fabio.roger@xxxxxxxxx>]

Hi

I have a board with 8 video inputs based on 1 bt848a. I am able to get 
video from the first input.

I've hacked the bttv-cards.c and added this into bttv_tvcards list:
       name:           "New Card (bt848a)",
       video_inputs:   8,
       audio_inputs:   0,
       tuner:          -1,
       svhs:           -1,
       gpiomask:       0,
       muxsel:         { 0, 1, 2, 3, 4, 5, 6, 7 },
       audiomux:       { 0 },
       needs_tvaudio:  0,
       pll:            PLL_28,
       tuner_type:     -1,

I want to know how can I find out the correct values, like gpiomask and 
muxsel. Is there some documentation about this?

Thanks in advance.

Fabio Roger