linux-kernel - Re: [PATCH v2] add support for Freescale's MMA8653FC 10 bit accelerometer

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Date:	Thu, 19 Mar 2015 11:22:57 +0100
From:	Bastien Nocera <hadess@...ess.net>
To:	Martin Kepplinger <martink@...teo.de>
Cc:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	dmitry.torokhov@...il.com, akpm@...ux-foundation.org,
	gregkh@...uxfoundation.org, linux-api@...r.kernel.org,
	devicetree@...r.kernel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Martin Kepplinger <martin.kepplinger@...obroma-systems.com>,
	Christoph Muellner <christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH v2] add support for Freescale's MMA8653FC 10 bit
 accelerometer

On Wed, 2015-03-18 at 19:28 +0100, Martin Kepplinger wrote:
> Am 2015-03-18 um 19:05 schrieb Bastien Nocera:
> > On Wed, 2015-03-18 at 19:02 +0100, Martin Kepplinger wrote:
> > > Am 2015-03-18 um 17:59 schrieb Bastien Nocera:
> > > > On Wed, 2015-03-18 at 17:42 +0100, Martin Kepplinger wrote:
> > > > > 
> > > > <snip>
> > > > > It could have gone to drivers/iio/accel if it would use an 
> > > > > iio   interface, which would make more sense, you are right, 
> > > > > but I 
> > > > > simply  don't have the time to merge it in to iio.
> > > > > 
> > > > > It doesn't use an input interface either but I don't see a 
> > > > > good   place for an accelerometer that uses sysfs only.
> > > > > 
> > > > > It works well, is a relatively recent chip and a clean 
> > > > > dirver.  But  this is all I can provide.
> > > > 
> > > > As a person who works on the user-space interaction of those 
> > > > with   desktops [1]: Urgh.
> > > > 
> > > > I already have 3 (probably 4) types of accelerometers to 
> > > > contend  with,  I'm not fond of adding yet another type.
> > > > 
> > > > Is there any way to get this hardware working outside the SoCs 
> > > > it's  designed for (say, a device with I2C like a Raspberry 
> > > > Pi),  so that a  kind soul could handle getting this using the 
> > > > right  interfaces?
> > > > 
> > > 
> > > It works on basically any SoC and is in no way limited in this  
> > > regard. Sure, userspace has to expicitely support it and I hear 
> > > you.  Using the iio interface would make more sense. I can only 
> > > say I'd  love to have the time to move this driver over. I'm 
> > > very sorry.
> > 
> > How can we get the hardware for somebody to use on their own  
> > laptops/embedded boards to implement this driver?
> > 
> 
> It's connected over I2C. If the included documentation is not clear 
> please tell me what exacly. Thanks!


I'll ask the question a different way: can you please give the address 
of a shop where that hardware is available?

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