linux-kernel - Re: [RFC] Should we create a raw input interface for IR's ? - Was: Re: [PATCH 1/3 v2] lirc core device driver infrastructure

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Date:	Thu, 26 Nov 2009 17:41:28 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	Christoph Bartelmus <lirc@...telmus.de>, awalls@...ix.net,
	dheitmueller@...nellabs.com, dmitry.torokhov@...il.com,
	j@...nau.net, jarod@...hat.com, jarod@...sonet.com,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, mchehab@...hat.com, superm1@...ntu.com
Subject: Re: [RFC] Should we create a raw input interface for IR's ? - Was: Re: [PATCH 1/3 v2] lirc core device driver infrastructure

Gerd Hoffmann <kraxel@...hat.com> writes:

> Why not?  With RC5 remotes applications can get the device address
> bits for example, which right now are simply get lost in the ir code
> -> 
> keycode conversion step.

Right, this in fact makes the input layer interface unusable for many
remotes at this time.
I think the address (aka group) should be just a part of the key
("command") code, IIRC this is what lirc RC5 does (I'm presently using
a custom "media" version of RC5).

> I know that lircd does matching instead of decoding, which allows to
> handle unknown encodings.  Thats why I think there will always be
> cases which only lircd will be able to handle (using raw samples).
>
> That doesn't make attempts to actually decode the IR samples a useless
> exercise though ;)

Sure. Especially RC5-like protos are simple to decode, and it's very
reliable, even with a very unstable remote clock source (such as
RC-based = resistor + capacitor).
-- 
Krzysztof Halasa
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