Re: [PATCH 1/2] USB gadget: video class function driver

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Hi Viral,

On Monday 03 May 2010 13:14:11 Viral Mehta wrote:
> Hi,
> 
> >This USB video class function driver implements a video capture device
> >from the host's point of view. It creates a V4L2 output device on the
> >gadget's side to transfer data from a userspace application over USB.
> >
> >The UVC-specific descriptors are passed by the gadget driver to the UVC
> >function driver, making them completely configurable without any
> >modification to the function's driver code.
> 
> I wanted to test this code. I git cloned[1] tree. It has v4l2-event.[c,h]
> and so I assume that now this tree has support for v4l2 event code.
> 
> But, while compilation, I am getting this error.
> [root@viral linux-next]# make uImage > /dev/null && make modules
>   CHK     include/linux/version.h
>   CHK     include/generated/utsrelease.h
> make[1]: `include/generated/mach-types.h' is up to date.
>   CALL    scripts/checksyscalls.sh
>   Building modules, stage 2.
>   MODPOST 5 modules
> ERROR: "v4l2_event_dequeue" [drivers/usb/gadget/g_webcam.ko] undefined!
> ERROR: "v4l2_event_init" [drivers/usb/gadget/g_webcam.ko] undefined!
> make[1]: *** [__modpost] Error 1
> make: *** [modules] Error 2
> 
> And by looking at the code, those symbols are not exported and thus the
> error is obvious. Can you please point me out where to take v4l2-event
> code? I tried to look for on linuxtv.org but was not able to locate the
> right code.
> 
> [1]git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-next.git

There's a patch pending on the linux-media list to export those two functions. 
It has been acked by Sakari (the author of the V4L2 events patch set), but not 
committed by Mauro to his linux-next yet. That should be a matter of days.

-- 
Regards,

Laurent Pinchart
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