linux-kernel - Re: Reporting screen/laptop orientation data to userspace

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Date:	Mon, 20 Jun 2011 15:53:58 +0100
From:	Bastien Nocera <hadess@...ess.net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Alberto Mardegan <mardy@...rs.sourceforge.net>,
	linux-kernel@...r.kernel.org,
	"Javier S. Pedro" <maemo@...ispedro.com>,
	linux-input@...r.kernel.org
Subject: Re: Reporting screen/laptop orientation data to userspace

On Mon, 2011-06-06 at 19:41 +0100, Alan Cox wrote:
> > When an "change" event is received on an accelerometer,
> > open its device node, and from the value, as well as the previous
> > value of the property, calculate the device's new orientation,
> > and export it as ID_INPUT_ACCELEROMETER_ORIENTATION.
> >     
> > Possible values are:
> > * undefined
> > * normal
> > * bottom-up
> > * left-up
> > * right-up
> 
> For quite a few of the discrete accelerometers not being used in
> 'joystick' mode this would make quite a sensible input interface,
> at least for those that generate inputs for their transitions.
> 
> You need a couple more values though because some devices care if they
> are held up/down/left/right or if they are lying flat on their front or
> on their back.
> 
> Phones for example sometimes go to speakerphone if laid flat on their
> back, and go into silent mode if turned over.

I'm not designing for phones though, and it seems to me this should be a
separate attribute anyway (and so did the people who wrote sensorfw for
MeeGo Handset).

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