Subject: Re: [RFC] What are the goals for the architecture of an in-kernel
 IR  system?
From: Andy Walls <awalls@radix.net>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Krzysztof Halasa <khc@pm.waw.pl>, Jon Smirl <jonsmirl@gmail.com>,
       Christoph Bartelmus <lirc@bartelmus.de>, dmitry.torokhov@gmail.com,
       j@jannau.net, jarod@redhat.com, jarod@wilsonet.com,
       linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
       linux-media@vger.kernel.org, maximlevitsky@gmail.com,
       mchehab@redhat.com, stefanr@s5r6.in-berlin.de, superm1@ubuntu.com
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Date: Tue, 01 Dec 2009 06:49:03 -0500
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On Tue, 2009-12-01 at 11:46 +0100, Gerd Hoffmann wrote:
> Hi,
> 
> > A current related problem is that i2c based devices can only be bound to
> > only one of ir-kbd-i2c *or* lirc_i2c *or* lirc_zilog at any one time.
> > Currently it is somewhat up to the bridge driver which binding is
> > preferred.  Discussion about this for the pvrusb2 module had the biggest
> > email churn IIRC.
> 
> 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....


> cheers,
>    Gerd
> 
> PS:  Not sure this actually makes sense for the i2c case, as far I know
>       these do decoding in hardware and don't provide access to the raw
>       samples,

True.

>  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?


Thanks,
Andy

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