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

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Date:	Tue, 01 Dec 2009 10:52:07 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
CC:	Christoph Bartelmus <lirc@...telmus.de>, awalls@...ix.net,
	dmitry.torokhov@...il.com, j@...nau.net, jarod@...hat.com,
	jarod@...sonet.com, jonsmirl@...il.com, khc@...waw.pl,
	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?

On 11/30/09 13:34, Mauro Carvalho Chehab wrote:
> Christoph Bartelmus wrote:
>> Hi Mauro,
>>
>> I just don't want to change a working interface just because it could be
>> also implemented in a different way, but having no other visible advantage
>> than using more recent kernel features.
>
> I agree. The main reasons to review the interface is:
> 	1) to avoid any overlaps (if are there any) with the evdev interface;

Use lirc for raw samples.
Use evdev for decoded data.

Hardware/drivers which can handle both can support both interfaces.

IMHO it makes no sense at all to squeeze raw samples through the input 
layer.  It looks more like a serial line than a input device.  In fact 
you can homebrew a receiver and connect it to the serial port, which was 
quite common in pre-usb-ir-receiver times.

> 	2) to have it stable enough to be used, without changes, for a long
> 	   time.

It isn't like lirc is a new interface.  It has been used in practice for 
years.  I don't think API stability is a problem here.

> True, but even if we want to merge lirc drivers "as-is", the drivers will
> still need changes, due to kernel CodingStyle, due to the usage of some API's
> that may be deprecated, due to some breakage with non-Intel architectures, due
> to some bugs that kernel hackers may discover, etc.

I assumed this did happen in already in preparation of this submission?

cheers,
   Gerd

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