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

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Message-ID: <4B1521EA.6050306@redhat.com>
Date:	Tue, 01 Dec 2009 15:02:18 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Andy Walls <awalls@...ix.net>
CC:	Krzysztof Halasa <khc@...waw.pl>, Jon Smirl <jonsmirl@...il.com>,
	Christoph Bartelmus <lirc@...telmus.de>,
	dmitry.torokhov@...il.com, j@...nau.net, jarod@...hat.com,
	jarod@...sonet.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	maximlevitsky@...il.com, mchehab@...hat.com,
	stefanr@...6.in-berlin.de, superm1@...ntu.com
Subject: Re: [RFC] What are the goals for the architecture of an in-kernel
 IR  system?

On 12/01/09 12:49, Andy Walls wrote:
> On Tue, 2009-12-01 at 11:46 +0100, Gerd Hoffmann wrote:
>> Once lirc_dev is merged you can easily fix this:  You'll have *one*
>> driver which supports *both* evdev and lirc interfaces.  If lircd opens
>> the lirc interface raw data will be sent there, keystrokes come in via
>> uinput.  Otherwise keystrokes are send directly via evdev.  Problem solved.
>
> This will be kind of strange for lirc_zilog (aka lirc_pvr150).  It
> supports IR transmit on the PVR-150, HVR-1600, and HD-PVR.  I don't know
> if transmit is raw pulse timings, but I'm sure the unit provides codes
> on receive.  Occasionally blocks of "boot data" need to be programmed
> into the transmitter side.  I suspect lirc_zilog will likely need
> rework....

Well, for IR *output* it doesn't make sense to disable evdev.  One more 
reason which indicates it probaably is better to introduce a ioctl to 
disable evdev reporting.  lircd will probably turn it off, especially 
when sending data to uevent.  debug tools might not, likewise apps 
sending IR.

>>   so killing the in-kernel IR limits to make ir-kbd-i2c
>                    ^^^^^^^^^^^^^^^^^^^
>>        being on par with lirc_i2c might be more useful in this case.
>
> I didn't quite understand that.  Can you provide a little more info?

Such as throwing away the address part of rc5 codes ...

cheers,
   Gerd
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