Proposal for redesigning the TTY layer

[Hans Petter Selasky]

Hi Ed,

Just some ideas:

Maybe you can add some more functionality to the TTY layer so that it becomes 
symmetric with regard to Host and Device side. For example that you can send 
a "RING" to a modem, and not only receive a "RING." This can be very 
interesting for embedded products where you want to emulate a modem through 
an USB device side driver. The official FreeBSD USB stack does not support 
device side drivers, but the one in P4 does.

--HPS