linux-kernel - Re: [RFC v2] Another approach to IR

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Message-Id: <1CA77278-9B8E-4169-8F10-78764A35F64E@wilsonet.com>
Date:	Wed, 2 Dec 2009 14:55:38 -0500
From:	Jarod Wilson <jarod@...sonet.com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Devin Heitmueller <dheitmueller@...nellabs.com>,
	Jon Smirl <jonsmirl@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>, awalls@...ix.net,
	j@...nau.net, jarod@...hat.com, khc@...waw.pl,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, lirc-list@...ts.sourceforge.net,
	superm1@...ntu.com, Christoph Bartelmus <lirc@...telmus.de>
Subject: Re: [RFC v2] Another approach to IR

On Dec 2, 2009, at 2:33 PM, Mauro Carvalho Chehab wrote:

> Dmitry Torokhov wrote:
>> 
...
>>>> (for each remote/substream that they can recognize).
>>> I'm assuming that, by remote, you're referring to a remote receiver (and not to 
>>> the remote itself), right?
>> 
>> If we could separate by remote transmitter that would be the best I
>> think, but I understand that it is rarely possible?
> 
> IMHO, the better is to use a separate interface for the IR transmitters,
> on the devices that support this feature. There are only a few devices
> I'm aware of that are able to transmit IR codes.

If I'm thinking clearly, there are only three lirc kernel drivers that support transmit, lirc_mceusb, lirc_zilog and lirc_serial. The mceusb driver was posted, so I won't rehash what it is here. The zilog driver binds to a Zilog z80 microprocessor thingy (iirc) exposed via i2c, found on many Hauppauge v4l/dvb devices (PVR-150, HVR-1600, HD-PVR, etc). The serial driver is fairly self-explanatory as well.

There are also a few userspace-driven devices that do transmit, but I'm assuming they're (currently) irrelevant to this discussion.

-- 
Jarod Wilson
jarod@...sonet.com



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