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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Message-ID: <m3iqcxuotd.fsf@intrepid.localdomain>
Date:	Thu, 26 Nov 2009 19:24:30 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Jarod Wilson <jarod@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org,
	Mario Limonciello <superm1@...ntu.com>,
	linux-input@...r.kernel.org, linux-media@...r.kernel.org,
	Janne Grunau <j@...nau.net>,
	Christoph Bartelmus <lirc@...telmus.de>
Subject: Re: [RFC] Should we create a raw input interface for IR's ? - Was: Re: [PATCH 1/3 v2] lirc core device driver infrastructure

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

> The issue I see is to support at the same time NEC and RC5 protocols. While
> this may work with some devices, for others, the hardware won't allow.

Sure. We can handle it for the "simple" devices at least.

>> I think the mapping should be: key = proto + group + raw code, while
>> key2 could be different_proto + different group (if any) + another code.
>
> This may work for protocols up to RC5, that uses either 8 or 16 bits.
> However, RC6 mode 6 codes can be 32 bits, and we have "only" 32 bits
> for a scancode. So, we don't have spare bits to represent a protocol, 
> if we consider RC6 mode 6 codes as well.

I don't see this limitation. The number of bits should depend on the
protocol.

> See above. Also, several protocols have a way to check if a keystroke were
> properly received. When handling just one protocol, we can use this to double
> check the key. However, on a multiprotocol mode, we'll need to disable this
> feature.

I don't think so. We can pass the space/mark data to all (configured,
i.e. with active mapping) protocol handlers at once. Should a check
fail, we ignore the data. Perhaps another protocol will make some sense
out of it.
-- 
Krzysztof Halasa
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