linux-kernel - Re: [Industrial I/O] [0/13] RFC: IIO v3 patchset

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Message-ID: <20081201194136.039e201b@lxorguk.ukuu.org.uk>
Date:	Mon, 1 Dec 2008 19:41:36 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jonathan Cameron <jic23@....ac.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dtor@...l.ru>,
	David Brownell <david-b@...bell.net>,
	Jean Delvare <khali@...ux-fr.org>,
	Ben Nizette <bn@...sdigital.com>,
	Jonathan Cameron <jic23@....ac.uk>,
	LM Sensors <lm-sensors@...sensors.org>,
	spi-devel-general@...ts.sourceforge.net
Subject: Re: [Industrial I/O] [0/13] RFC: IIO v3 patchset

> have both functions. The sort of devices we are talking typically
> communicate over I2C or SPI buses though drivers for rs232 devices etc are
> definitely on the cards. Basically we are interested in devices where direct
> memory mapped access is not possible.

We have I2C and SPI drivers so I assume you will use the lower layers of
the stacks to do this ?

> For discussion of why these don't fit within existing subsystems see 
> http://lkml.org/lkml/2008/5/20/135 and the rest of the associated thread.

I don't see much there which says why you can't unify all this in a user
space library.

For RS232/423/.. devices you can go this path if you want (but I would
keep it all in userspace anyway) as you can use a line discipline to sit
on top of the port and provide another interface (eg the way PPP does)
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