Re: Hardware initialization in line discipline - ldisc_open() ?

[Peter Stuge <peter@stuge.se>]

Alan Cox wrote:
> > > Similar problem with the GSM mux I've been working on. I've gone for
> > > making the ldisc attach always work and then kicking things off via an
> > > ioctl which sets the desired mode/parameters/encoding.
> > 
> > I'll do the same. Did you add a new ioctl for this, or use an
> > existing one?
> 
> I added a private one - given I needed to pass the adaption layer code,
> gsm mux level and whether we were initiator or not it didn't really fit
> anything generic in the tty layer.

I was trying to reuse an existing ioctl, partly because I'm not sure
how to add a one and partly because fewer are better, but
TIOCSERCONFIG which seemed fitting does not appear to be passed on to
my ldisc. :\

Should I make a new one (what does private mean here btw?) and how do
I do it exactly? Is patching Documentation/ioctl/ioctl-number.txt and
asm/ioctls.h all? The "addressing" in ioctl-number seems a little
chaotic, do I just pick anything that is available?


//Peter