linux-kernel - Re: [RFC] What are the goals for the architecture of an in-kernel IR system?

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Message-ID: <m3hbs1vain.fsf@intrepid.localdomain>
Date:	Tue, 08 Dec 2009 14:52:00 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Jon Smirl <jonsmirl@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	hermann pitton <hermann-pitton@...or.de>,
	Christoph Bartelmus <lirc@...telmus.de>, awalls@...ix.net,
	j@...nau.net, jarod@...hat.com, jarod@...sonet.com,
	kraxel@...hat.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	superm1@...ntu.com
Subject: Re: [RFC] What are the goals for the architecture of an in-kernel IR 	system?

Mauro Carvalho Chehab <mchehab@...hat.com> writes:

>> What is the interface for attaching an in-kernel decoder?
>
> IMO, it should use the kfifo for it. However, if we allow both raw data and
> in-kernel decoders to read data there, we'll need a spinlock to protect the
> kfifo.

This may be an option, but I think we should be able to attach protocol
decoders in parallel, directly to the IRQ handler. At least with RC-5
(that's what I personally use) it means reliable decoding, no need for
any timeouts, the code is clean, fast (can be a part of hard IRQ
handler) and simple.

The decoder needs something like
	rc5_signal_change(ptr, space_or_mark, microseconds).

At least mark->space or space->mark events must be reported. For better
reliability, both of them.
-- 
Krzysztof Halasa
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