linux-kernel - Re: [RFC] Add Input IOCTL for accelerometer devices

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Date:	Sat, 16 May 2009 15:50:40 +0300
From:	Felipe Balbi <felipe.balbi@...ia.com>
To:	ext Mohamed Ikbel Boulabiar <boulabiar@...il.com>
Cc:	"Balbi Felipe (Nokia-D/Helsinki)" <felipe.balbi@...ia.com>,
	Trilok Soni <soni.trilok@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	Jonathan Cameron <jic23@....ac.uk>
Subject: Re: [RFC] Add Input IOCTL for accelerometer devices

Hi,

On Sat, May 16, 2009 at 06:19:33AM +0200, ext Mohamed Ikbel Boulabiar wrote:
> On Fri, May 15, 2009 at 9:02 PM, Felipe Balbi <felipe.balbi@...ia.com> wrote:
> 
> > Yeah, let's try to define the best way to expose accelerometers with
> > linux kernel and avoid a sysfs hell. Better sooner than later.
> 
> isn't the best way to add a thing like the one for battery for any input device
> /proc/acpi/battery/CMB0/state
> or even in /sys/input/devices/XXXX
> 
> and let any userspace application do what she wants with information ?

This case is the other way around. We are trying to set proper
thresholding and other parameters depending on the user application
(gaming, screen rotation, etc).

> > Say we wanna use the accelerometer for both screen rotation and gaming,
> > that device isn't doing hw monitoring and still we _do_ want to set
> > different thresholds and irq requests/types for different use cases,
> > right ?
> 
> Another reason for preparing the interface I just cited.

Yes, and the interface would be an input ioctl so that userland would
give us the parameters and the driver just sets them to proper
registers.

-- 
balbi
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