linux-kernel - Re: [spi-devel-general] [Patch 0/4] IndustrialIO subsystem (ADCs, accelerometers etc)

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Date:	Thu, 24 Jul 2008 09:41:25 +0200
From:	"Hans J. Koch" <hjk@...utronix.de>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	Jonathan Cameron <Jonathan.Cameron@...il.com>,
	mgross@...ux.intel.com, Dmitry Torokhov <dtor@...l.ru>,
	LKML <linux-kernel@...r.kernel.org>,
	LM Sensors <lm-sensors@...sensors.org>,
	David Brownell <david-b@...bell.net>, hmh@....eng.br,
	Jean Delvare <khali@...ux-fr.org>,
	spi-devel-general@...ts.sourceforge.net,
	Ben Nizette <bn@...sdigital.com>
Subject: Re: [spi-devel-general] [Patch 0/4] IndustrialIO subsystem (ADCs,
	accelerometers etc)

On Wed, Jul 23, 2008 at 08:19:18PM +0100, Ben Dooks wrote:
> On Wed, Jul 23, 2008 at 06:00:29PM +0100, Jonathan Cameron wrote:
> > Dear All,
> > 
> > The need for an industrialio subsystem was discussed in
> > http://lkml.org/lkml/2008/5/20/135
> 
> The name is really bad, this sounds like something for doing large
> scale industrial process control.

Well, it says "Industrial I/O". To me, this means it handles I/O devices
typically found in industrial applications.

>  
> > Firstly thanks to all the people who have contributed to the discussion
> > of this in the past.
> > 
> > In brief the intention is provide a kernel subsystem directed towards the
> > handling on sensors (and later related output devices) such as ADC's,
> > accelerometers and many others.
> 
> We've already got an perfectly good hwmon framework, do we really need
> to do this again?

hwmon is designed for slow I/O. It won't handle an ADC that does a few
megasamples/sec.

Thanks,
Hans

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