Thread (46 messages) 46 messages, 14 authors, 2009-11-30

Re: [RFC] Should we create a raw input interface for IR's ? - Was: Re: [PATCH 1/3 v2] lirc core device driver infrastructure

From: Mauro Carvalho Chehab <hidden>
Date: 2009-11-26 17:49:26
Also in: linux-input, linux-media

Possibly related (same subject, not in this thread)

Jarod Wilson wrote:
On 11/26/2009 08:54 AM, Mauro Carvalho Chehab wrote:
quoted
Jarod Wilson wrote:
quoted
On Nov 23, 2009, at 7:53 PM, Andy Walls wrote:
quoted
On Mon, 2009-11-23 at 22:11 +0100, Christoph Bartelmus wrote:
...
quoted
I generally don't understand the LIRC aversion I perceive in this
thread
(maybe I just have a skewed perception).  Aside for a video card's
default remote setup, the suggestions so far don't strike me as any
simpler for the end user than LIRC -- maybe I'm just used to LIRC. 
LIRC
already works for both transmit and receive and has existing support in
applications such as MythTV and mplayer.
There's one gripe I agree with, and that is that its still not
plug-n-play.
Something where udev auto-loads a sane default remote config for say,
mceusb transceivers, and the stock mce remote Just Works would be nice,
but auto-config is mostly out the window the second you involve
transmitters
and universal remotes anyway.
For several devices, an udev rule that auto-loads a sane default
keymap does work.
Of course, this won't cover 100% of the usages, and I lirc is a very
good way
of covering the holes.
quoted
But outside of that, I think objections are largely philosophical --
in a nutshell, the kernel has an input layer, remotes are input devices,
and lirc doesn't conform to input layer standards.
Yes. I think this is mainly the issue.

The other issue is how to migrate the existing drivers to a new API
without
causing regressions. If we decide that IR's that receive raw pulse/code
should use the raw input interface, this means that a large task force
will be
needed to convert the existing drivers to use it.
Aversion to regression is definitely a major concern. And why I'm liking
the idea of a hybrid approach, at least initially.
Yes. This indeed seems to be a very good idea.
quoted
What do you think of adding lirc at staging while we discuss/improve
the API's and lircd
support for the input event interface? Do you think this would work?
Sure, I don't see why not. And I've got another dozen or so drivers to
follow those first three... :)
Ok. As you said you'll do some work at the patches, could you please send us v3
in order to add it into drivers/staging? 

In the case of the API header file, I would tag at the header file that the API
is experimental, so can be changed without prior announcements, etc (in order to
avoid people to use and rely on it it outside lirc). IMO, the better is to keep
such announcement there while we're still working at the hybrid approach, as we
may need to change something during the development phase.

Dmitry,

While lirc is basically a series of input drivers, considering that they have lots
in common with the input drivers at V4L/DVB and that we'll need to work on
some glue to merge both, do you mind if I add the lirc drivers at drivers/staging from
my trees? 

Cheers,
Mauro.
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