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

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Message-ID: <20100831104446.321fd4f4@lxorguk.ukuu.org.uk>
Date:	Tue, 31 Aug 2010 10:44:46 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Felipe Balbi <me@...ipebalbi.com>, Hemanth V <hemanthv@...com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"igor.stoppa@...ia.com" <igor.stoppa@...ia.com>,
	"kai.svahn@...ia.com" <kai.svahn@...ia.com>,
	"matthias.nyman@...ia.com" <matthias.nyman@...ia.com>
Subject: Re: Sensors and the input layer (was Re: [RFC] [PATCH V2 1/2]
 input: CMA3000 Accelerometer driver)

> 1. Input transport via evdev is very convenient
> 2. There is no other standard alternative
> 
> Once there is standard interface for such sensors they will happily use
> it and will not look back.

I think the fact that most of the interest in IIO is "how do we make an
IIO/Input bridge" speaks volumes.

> Sure, for a particular cell phone there is no ambiguity, the sensor has
> certain functionality assigned that is well known. But does this mean
> that we should not expect parts being reused at all anymore?

If non-input uses later need non-input interfaces they can switch to that
with an input bridge when there is one and when it happens, which
probably won't.

> I am unsure how you would play a game with GPS as an input device.

In a non-game context take a look at things like the British Museum
application that allows you to view wherever you are and as it was long
ago by fishing out a relevant photograph as you walk around. In a game
context can I suggest the Zombies game is an example ?

Alan
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