linux-kernel - Re: Sensors and the input layer (was Re: [RFC] [PATCH V2 1/2] input: CMA3000 Accelerometer driver)

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Date:	Mon, 30 Aug 2010 09:28:56 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Felipe Balbi <me@...ipebalbi.com>
Cc:	Hemanth V <hemanthv@...com>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	igor.stoppa@...ia.com, kai.svahn@...ia.com,
	matthias.nyman@...ia.com
Subject: Re: Sensors and the input layer (was Re: [RFC] [PATCH V2 1/2] input:
 CMA3000 Accelerometer driver)

Hi Felipe,

On Mon, Aug 30, 2010 at 11:04:39AM -0500, Felipe Balbi wrote:
> Hi Dmitry,
> 
> When we tried to push N900's accelerometer driver as an
> input device you commented you didn't want sensors such
> as accelerometers, magnetometers, proximity, etc on the
> input layer because "they are not user input", although
> I didn't fully agree with you, we had to modify the drivers
> and, I believe, one of them is sitting in staging under
> the industrial i/o subsystem.
> 
> Are you now accepting sensor drivers on the input layer ?
> that will make our life a lot easier but we need some
> definition to avoid having to re-work drivers when we
> want to push them to mainline.
> 

I got persuaded that 3-axis accelerometers are most often indended to be
used as input devices so I decided I should take these in (adxl134x is
there). I still think that sensor devices in general are better suited
to IIO subsystem and I hope it will get out of staging soon.

Once it is out of staging we may think about creating a IIO-to-input
bridge (copuld be either in kernel or a userspace solution based on
uinput) to route sensors that are indeed used as HIDs.

Hope this makes sense.

-- 
Dmitry
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