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

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Date:	Tue, 30 Mar 2010 09:43:17 -0300
From:	Mauro Carvalho Chehab <mchehab@...hat.com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jon Smirl <jonsmirl@...il.com>, Pavel Machek <pavel@....cz>,
	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?

David Härdeman wrote:
> On Sun, Mar 28, 2010 at 08:22:31PM -0300, Mauro Carvalho Chehab wrote:
>> I also noticed another problem: kernel should have some way to report 
>> the expected
>> size of the scancode to userspace, especially if we want to have the compatibility
>> code (since, with compat, a scancode maximum size need to be 32 bits, otherwise
>> the code won't work).
>>
>> I'll likely adding another control that returns the size of the scancode.
> 
> And perhaps the interface should explicitly define that for the case 
> where userspace sends an undersized scancode, the real scancode will be 
> generated by zero-extending the undersized scancode into its expected 
> size.
> 
> That way the interface will be binary-forwards-compatible even if 
> scancode sizes are increased at some later date.

Makes sense. Padding an undersized scancode is endian-dependent. So, we'll
likely need to add some padding functions. The better seems to add the logic
at include/linux/byteorder/generic.h.


-- 

Cheers,
Mauro
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