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

From:  lirc-AT-bartelmus.de (Christoph Bartelmus)
To:  jonsmirl-AT-gmail.com
Subject:  Re: [RFC] What are the goals for the architecture of an in-kernel IR system?
Date:  29 Nov 2009 13:01:00 +0100
Cc:  awalls-AT-radix.net
Archive-link:  Article, Thread

Hi Jon,

on 27 Nov 09 at 12:49, Jon Smirl wrote:
[...]
> Christoph, take what you know from all of the years of working on LIRC
> and design the perfect in-kernel system. This is the big chance to
> redesign IR support and get rid of any past mistakes. Incorporate any
> useful chunks of code and knowledge from the existing LIRC into the
> new design. Drop legacy APIs, get rid of daemons, etc. You can do this
> redesign in parallel with existing LIRC. Everyone can continue using
> the existing code while the new scheme is being built. Think of it as
> LIRC 2.0. You can lead this design effort, you're the most experience
> developer in the IR area.

This is a very difficult thing for me to do. I must admit that I'm very  
biased.
Because lircd is the only userspace application that uses the LIRC kernel  
interface, we never had any problems changing the interface when needed.
I can't say there's much legacy stuff inside. I'm quite happy with the  
interface.
The other thing is that I can't really move the decoder from userspace to  
kernel because there are way too many userspace drivers that do require a  
userspace decoder. LIRC also is running on FreeBSD, MacOS and even Cygwin.  
So letting the userspace drivers take advantage of a potential Linux in- 
kernel decoder is not an option for me either.
I'm having my 'LIRC maintainer' hat on mostly during this discussion and I  
do understand that from Linux kernel perspective things look different.

> Take advantage of this window to make a
> design that is fully integrated with Linux - put IR on equal footing
> with the keyboard and mouse as it should be.

That's a question that I have not answered for myself concludingly.
Is a remote control really on exactly the same level as a keyboard or  
mouse?

Christoph
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