linux-kernel - Re: [PATCH 01/11] misc: inv_mpu primary header file and README file.

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Message-ID: <20110706115430.3745592c@bob.linux.org.uk>
Date:	Wed, 6 Jul 2011 11:54:30 +0100
From:	Alan Cox <alan@...ux.intel.com>
To:	Nathan Royer <nroyer@...ensense.com>
Cc:	Jonathan Cameron <jic23@....ac.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jiri Kosina <jkosina@...e.cz>,
	Jean Delvare <khali@...ux-fr.org>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	Chris Hudson <chudson@...nix.com>, eric.andersson@...xphere.com
Subject: Re: [PATCH 01/11] misc: inv_mpu primary header file and README
 file.

> It seems that some sensors are in input and but that most are in iio.
> Obviously I don't want to dissent with both and put ours in misc, so
> how do we make this better?  Should we work on cleaning this up.  If
> so should we start moving the drivers that are in input to iio.

IIO provides a lot more flexibility and is rather newer, input provides
a more focussed interface. In some cases it may make sense to provide
different interfaces to each (eg atomspheric pressure doesn't fit well
into input, but 3 axis accelerometers fit perfectly)

> We still need a way to read and write registers and DMP memory during
> runtime from user space.

You probably want a driver for the MPU itself whih provides the
needed glue and also control interfaces (firmware load etc). That may
well be a drivers/misc item as I imagine that part is quite unique and
specialised.
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