linux-kernel - Re: Update VIP to videobuf2 and control framework

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Date:	Sun, 05 Aug 2012 19:11:19 +0200
From:	Federico Vaga <federico.vaga@...il.com>
To:	Hans Verkuil <hverkuil@...all.nl>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Pawel Osciak <pawel@...iak.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Giancarlo Asnaghi <giancarlo.asnaghi@...com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jonathan Corbet <corbet@....net>
Subject: Re: Update VIP to videobuf2 and control framework

Hi Hans,
 
> Did you run the latest v4l2-compliance tool from the v4l-utils.git
> repository over your driver? I'm sure you didn't since VIP is missing
> support for control events and v4l2-compliance would certainly
> complain about that.
> 
> Always check with v4l2-compliance whenever you make changes! It's
> continuously improved as well, so a periodic check wouldn't hurt.

I applied all your suggestions, and some extra simplification; now I'm 
running v4l2-compliance but I have this error:


Allow for multiple opens:
        test second video open: OK
        test VIDIOC_QUERYCAP: OK
                fail: v4l2-compliance.cpp(322): doioctl(node, 
VIDIOC_G_PRIORITY, &prio)
        test VIDIOC_G/S_PRIORITY: FAIL


which I don't undestand. I don't have vidio_{g|s}_priority functions in 
my implementation. And I'm using the V4L2_FL_USE_FH_PRIO flag as 
suggested in the documentation:

---------------
- flags: optional. Set to V4L2_FL_USE_FH_PRIO if you want to let the 
framework handle the VIDIOC_G/S_PRIORITY ioctls. This requires that you 
use struct v4l2_fh. Eventually this flag will disappear once all drivers 
use the core priority handling. But for now it has to be set explicitly.
--------------

-- 
Federico Vaga
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