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Date: Fri, 11 Apr 2008 15:46:52 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: lsorense@csclub.uwaterloo.ca (Lennart Sorensen)
Cc: Rodolfo Giometti <giometti@enneenne.com>, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@linux-foundation.org>,
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       Randy Dunlap <randy.dunlap@oracle.com>,
       Kay Sievers <kay.sievers@vrfy.org>
Subject: Re: [PATCH 5/7] PPS: serial clients support.
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> I thought it just required that the uart driver call
> uart_handle_dcd_change when the state of the CD changes, and all the PPS
> stuff happened in that function.

uart_ is only used by some drivers. We have a whole army of drivers using
the tty layer directly and another army of drivers using the USB layer.

You also need a sensible way to talk to the devices, identify support and
avoid clashing uses of carrier pins.

Alan