linux-kernel - RE: [RFC] Staging:IIO: New ABI

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Message-ID: <8A42379416420646B9BFAC9682273B6D0F1DB670@limkexm3.ad.analog.com>
Date:	Tue, 26 Jan 2010 09:55:45 +0000
From:	"Hennerich, Michael" <Michael.Hennerich@...log.com>
To:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>,
	"Greg KH" <greg@...ah.com>
CC:	"Jonathan Cameron" <kernel@...23.retrosnub.co.uk>,
	"Jonathan Cameron" <jic23@....ac.uk>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Manuel Stahl" <manuel.stahl@....fraunhofer.de>,
	"Frysinger, Michael" <Michael.Frysinger@...log.com>,
	"Getz, Robin" <Robin.Getz@...log.com>,
	"Jean Delvare" <khali@...ux-fr.org>,
	"Trisal, Kalhan" <kalhan.trisal@...el.com>,
	"Zhang, Xing Z" <xing.z.zhang@...el.com>,
	"Ira Snyder" <iws@...o.caltech.edu>
Subject: RE: [RFC] Staging:IIO: New ABI



>From: Dmitry Torokhov [mailto:dmitry.torokhov@...il.com]
>
>On Fri, Jan 22, 2010 at 04:31:12PM -0800, Greg KH wrote:
>> On Fri, Jan 22, 2010 at 04:14:15PM -0800, Dmitry Torokhov wrote:
>> > On Fri, Jan 22, 2010 at 12:47:18PM -0800, Greg KH wrote:
>> > > On Wed, Jan 20, 2010 at 04:53:21PM +0000, Jonathan Cameron wrote:
>> > > > I am not aware of these. Could you direct me to the current api? Also note that these
>> > > > aren't the actual alarms, merely a means of enabling the relevant event on the related
>> > > > event character device.
>> > >
>> > > Hm, I thought we had an accelerator interface somewhere...
>> > >
>> >
>> > Nope. And I am also interested in this since I am sittign on a bunch of
>> > accelerometers, magnetometers, etc drivers that are trying to plug into
>> > input sysbsystem and quite unsure what to do with them.
>> >
>> > It was OK whch HDAPS and friends when they were using input for
>> > secondary, toyish purposes, but these new drivers trying to use input
>> > devnts as primary API and I am unsure if it is the best solution.
>> > Accelerometer might be used as an input device but not always an input
>> > device.
>>
>> Yeah, I see it using a joystick interface, which might be acceptable for
>> "toy" devices like you say.
>>
>> But for "real" ones, we should do something else.
>>
>> Maybe, for devices that are going to be used by x.org, like the "toy"
>> ones, we stick with the current input interface, but for others, we use
>> a "real" interface, probably through hwmon, so that users can get the
>> real data out in a consistant manner.
>>
>
>I'd rather have all of them use real interface and then have a bridge
>to input module to enable toyish mode (unless the device in question
>is really truly an input device).
>
>--
>Dmitry

I really don't see that hwmon provides facilities like input/evdev does.
Queuing of events with time stamping and multiple reader support.
The adxl34x accelerometer driver for example is really intended to be a input device.
Send EV_KEY for x,y,z_TAP detections, send EV_KEY for 3D orientation sensing, and EV_ABS for acceleration.
With very minor platform data customization you can use this device for game controls or GUI interaction.
A few examples include digital picture frames, ebook readers, etc.

-Michael

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