linux-kernel - RE: Serial custom speed deprecated?

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Date:	Mon, 28 Aug 2006 10:14:30 -0400
From:	"Stuart MacDonald" <stuartm@...necttech.com>
To:	"'Rogier Wolff'" <R.E.Wolff@...Wizard.nl>,
	"'Alan Cox'" <alan@...rguk.ukuu.org.uk>
Cc:	"'linux-os \(Dick Johnson\)'" <linux-os@...logic.com>,
	"'Krzysztof Halasa'" <khc@...waw.pl>,
	"'David Woodhouse'" <dwmw2@...radead.org>,
	<linux-serial@...r.kernel.org>,
	"'LKML'" <linux-kernel@...r.kernel.org>
Subject: RE: Serial custom speed deprecated?

From: On Behalf Of Rogier Wolff
> Note that IMHO, we should have started hiding this mess from /drivers/
> a long time ago. The tty layer should convert the B_9600 thingies to
> "9600", the integer, and then call the set_termios function. The
> driver should be prohibited from looking at how the the baud rate came
> to be 9600, and attempt to approach the requested baud rate as good as
> possible. It might return a flag somewhere: Not exact. In the example
> above, the resulting baud rate is about 1.4 baud off: 9598.6. This is
> not a problem in very many cases.
> 
> Once this is in place, you lose a lot of "figure out the baud rate
> integer from the B_xxx settings" code in all the drivers, as well as
> that we get to provide a new interface to userspace without having to
> change ALL drivers at the same time. This decouples the drivers from
> the kernel<->userspace interface.

I'll second the motion. :-)

..Stu

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