This isn't part 121 operations but have a look at my summary here:
I tried to do this but in the end I concluded that it is too risky to use a tablet PC for this purpose.
Commercial implementations have a "tablet" which is just the LCD panel in a very slim case, with a brightness control and little else. They have a cable going to a remotely mounted box, which presumably contains a PC running Jeppview or whatever. They have two of these, one per pilot, with separate power etc.
No way would I use a tablet PC running Jeppview as a replacement for printed charts. It's OK en-route (if one has more than one GPS, with separate power sources) but for terminal/approach stuff a PC running windoze is just not reliable enough.
Obviously one has to program all buttons to do nothing (in case of accidental touching) but even that is not enough, I found.