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

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Message-ID: <20080724153816.GE2254@local>
Date:	Thu, 24 Jul 2008 17:38:17 +0200
From:	"Hans J. Koch" <hjk@...utronix.de>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	"Hans J. Koch" <hjk@...utronix.de>,
	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 Thu, Jul 24, 2008 at 11:01:44AM +0100, Ben Dooks wrote:
> On Thu, Jul 24, 2008 at 09:41:25AM +0200, Hans J. Koch wrote:
> > 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.
> 
> Yes, industrial is generally process control of manufacturing
> processes which in my view is making this sound like it is limiting
> the field of operations.

OK, I agree.

> 
> All the applications we would currently need are things like
> handheld PDA type devices which are hardly 'industrial' or small
> consumer measurement systems.

Well, though the _use_ of such devices might not be "industrial",
_technically_ they are very similar to embedded systems found in
automation or other industrial equipment.

Many of these devices (all that have mmappable memory) can be handled
with a UIO driver, but for the rest (mostly stuff connected to serial
busses), it's important to have a subsystem in the kernel. I really
don't care too much about its name. BTW, before UIO was first published,
its internal name was "Industrial I/O" ;-)

Thanks,
Hans

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