linux-kernel - Re: [PATCH] ldisc: new dcd_change() method for line disciplines.

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Message-ID: <492FD864.50901@imap.cc>
Date:	Fri, 28 Nov 2008 12:39:16 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Rodolfo Giometti <giometti@...ux.it>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH] ldisc: new dcd_change() method for line disciplines.

Rodolfo Giometti schrieb:
> --- a/include/linux/tty_ldisc.h
> +++ b/include/linux/tty_ldisc.h
> @@ -99,11 +99,19 @@
>   *	cease I/O to the tty driver. Can sleep. The driver should
>   *	seek to perform this action quickly but should wait until
>   *	any pending driver I/O is completed.
> + *
> + * void (*dcd_change)(struct uart_port *port, unsigned int status,
> + * 			struct timespec *ts)
> + *
> + *	Tells the discipline that the DCD pin has changed its status and
> + *	the relative timestamp. Pointer ts can be NULL.
>   */

I don't see an actual call to that new method getting added anywhere.
Is that planned for a later patch? Which serial drivers will support
that mechanism? Should the documentation perhaps mention that not
all drivers support this?

Thanks,
Tilman

-- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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