Is your camera a Canon camera running the chdk software (I ask because of your mention of liveview)? I have some familiarity with this, but am using a dockstar running debian rather than openwrt. What is it you want usb to do that it isn't doing?
I am not actually using chdk liveview (because my dockstar is headless), but am using remote shoot via a browser window.
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No, my camera only has the "stock" software on it. I've been tempted to try running "Magic Lantern" software on it, but haven't gotten around to working through all of the potential issues (loss of warranty, will it work w/ Lightroom and Canon's EOS Utility, etc, etc, etc).
Anyway, to answer your question: What I want to do is replace the USB cable with a WiFi link. I thought this would be easy, but as they say, "the devil's in the details."