[9fans] kvm and hotswap compatable mouse.c

[9fans] kvm and hotswap compatable mouse.c

[erik quanstrom]

this has been driving me nuts for a long time.  i've had
to have a mouse for each machine running rio because
mouse.c wasn't very amenable to either hot-plugged ps/2
or kvm-attached ps/2 mice.  since steve mentioned the
led problem, i was motivated to finally rid my desk of
extra rodents:
	/n/sources/contrib/quanstro/mouse.c

the approach is
- turn off streaming mode when sending commands,
- always set 1:1 aka "linear" mode.  much loved by iogear kvm.
- don't use 2:1 mode (unloved by kvms and it confuses some
fancy mice).  trivial to simulate in s/w.
- capture power-on signatures and set hot-plugged mice
up in streaming mode.

thanks for the motivation, steve.

- erik