Re: [PATCH] serial: DCC(JTAG) serial and console emulation support
From: Alan Cox
Date: Thu Oct 07 2010 - 16:43:29 EST
> > I would agree 100% with this for the driver in question. The tty_port
> > helpers now make it trivial to do so and it'll be small and clean as a
> > result.
>
> Can you give some example of other drivers which have done this?
The blackfin driver is probably the nicest example for a very simple
device but see also the USB serial drivers (complex example), the SDIO
serial support (shows how to do fancy hotpluggable device stuff with it).
Basically tty_port_open/tty_port_close/tty_port_hangup do all the icky
nasty POSIX open/close/hangup handling and provide you with simple
methods to implement activate/shutdown of a port and carrier detect etc
most of which you don't even need to supply.
You can also skip a lot of other stuff like modem lines - although I can
see why you might want to provide an emulated modem line response for a
console emulation.
Alan
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