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

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Message-ID: <20100326122317.GC5387@hardeman.nu>
Date:	Fri, 26 Mar 2010 13:23:18 +0100
From:	David Härdeman <david@...deman.nu>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Jon Smirl <jonsmirl@...il.com>, Pavel Machek <pavel@....cz>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Krzysztof Halasa <khc@...waw.pl>,
	hermann pitton <hermann-pitton@...or.de>,
	Christoph Bartelmus <lirc@...telmus.de>, awalls@...ix.net,
	j@...nau.net, jarod@...hat.com, jarod@...sonet.com,
	kraxel@...hat.com, 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 Thu, Mar 25, 2010 at 11:42:33AM -0300, Mauro Carvalho Chehab wrote:
>>        2) add current_protocol support on other drivers;
> 
> Done. Patch were already merged upstream.
> 
> The current_protocol attribute shows the protocol(s) that the device is accepting
> and allows changing it to another protocol. 
> 
> In the case of the em28xx hardware, only one protocol can be active, since the decoder
> is inside the hardware. 
> 
> On the raw IR decode implementation I've done at the saa7134, all raw pulse events are
> sent to all registered decoders, so I'm thinking on using this sysfs node to allow
> disabling the standard behavior of passing the IR codes to all decoders, routing it
> to just one decoder.
> 
> Another alternative would be to show current_protocol only for devices with hardware
> decoder, and create one sysfs node for each decoder, allowing enabling/disabling each
> decoder individually.

You're eventually going to want to add ioctl's to set a lot of TX or RX 
parameters in one go (stuff like active receiver(s) and transmitter(s), 
carrier frequency, duty cycle, timeouts, filter levels and resolution - 
all of which would need to be set in one operation since some hardware 
will need to be reset after each parameter is changed).

Then you'll end up with a few things being controlled via sysfs and some 
being controlled via ioctls. Maybe it's a good idea to have a bitmask of 
supported and enabled protocols in those ioctls instead?

-- 
David Härdeman
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