USB keyboard udev rule

[Alastair Johnson]

Pander wrote:
> Does anyone have a udev rule for USB keyboard that does the following.
> When no external USB devices are connected and a keyboard is plugged in,
> USB can switch to host mode and switch back when USB keyboard is
> unplugged. As far as I'm concerned, this would be a very welcome feature.

AFAIK we don't have a means of autodetecting whether we should be host 
or device, and if we aren't in host mode we can't detect the keyboard 
insertion. There may be a way of doing this using the ID pin but I don't 
know how standard it would be.