Subject: Re: [RFC] Should we create a raw input interface for IR's ? - Was:
 Re: [PATCH 1/3 v2] lirc core device driver infrastructure
From: Andy Walls <awalls@radix.net>
To: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Jarod Wilson <jarod@wilsonet.com>, Krzysztof Halasa <khc@pm.waw.pl>,
       Christoph Bartelmus <lirc@bartelmus.de>, dmitry.torokhov@gmail.com,
       j@jannau.net, jarod@redhat.com, linux-input@vger.kernel.org,
       linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
       superm1@ubuntu.com
In-Reply-To: <4B1E394A.1090807@redhat.com>
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Date: Tue, 08 Dec 2009 07:46:52 -0500
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On Tue, 2009-12-08 at 09:32 -0200, Mauro Carvalho Chehab wrote:
> Andy Walls wrote:
> > On Mon, 2009-12-07 at 13:19 -0500, Jarod Wilson wrote:

> > So I'll whip up an RC-6 Mode 6A decoder for cx23885-input.c before the
> > end of the month.
> 
> Good! Please, try to design the decoder as an independent module that gets
> data from a kfifo and generate scancodes for the input API.

Hmmm.  Let me see how the protoype turns out keeping that design
objective in mind.  I've already got the current RC-5 and NEC decoding
state machines in cx23885-input a bit layered, but they are taking
advantage of specific events signaled by my v4l2_subdev implementation.

Strictly speaking the state machines don't have to.  All of the remote
protocols I have played with make framing pretty easy.


> > I can setup the CX2388[58] hardware to look for both RC-5 and RC-6 with
> > a common set of parameters, so I may be able to set up the decoders to
> > handle decoding from two different remote types at once.  The HVR boards
> > can ship with either type of remote AFAIK.
> > 
> > I wonder if I can flip the keytables on the fly or if I have to create
> > two different input devices?
> 
> IMO, the better is, by default, to open just one input device per IR receiver.
> >From what I understand from our discussions, if the user wants to filter IR
> commands into several input interfaces, some userspace interface will be 
> provided to allow the creation of other input interfaces for that purpose.

Hmm. That's not what I just thought I read from Dmitry....

Oh well.  If I don'y get it done by 24 Dec, it'll be in the new year.


Regards,
Andy


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