Re: uvc_driver.c compile error on 2.6.18

[Laurent Pinchart <laurent.pinchart@xxxxxxxxx>]

On Wednesday 02 July 2008, Hans Verkuil wrote:
> > Hi Hans,
> >
> > On Wednesday 02 July 2008, Hans Verkuil wrote:
> >> Hi all,
> >>
> >> The current v4l-dvb doesn't build anymore on 2.6.18:
> >>
> >>   CC [M]  /home/hans/work/src/v4l/v4l-dvb/v4l/uvc_driver.o
> >> /home/hans/work/src/v4l/v4l-dvb/v4l/uvc_driver.c: In
> >> function 'uvc_parse_control':
> >> /home/hans/work/src/v4l/v4l-dvb/v4l/uvc_driver.c:1135: warning: implicit
> >> declaration of function 'usb_endpoint_is_int_in'
> >> /home/hans/work/src/v4l/v4l-dvb/v4l/uvc_driver.c: At top level:
> >> /home/hans/work/src/v4l/v4l-dvb/v4l/uvc_driver.c:1918: error: unknown
> >> field 'supports_autosuspend' specified in initializer
> >> /home/hans/work/src/v4l/v4l-dvb/v4l/uvc_driver.c:1918: warning: missing
> >> braces around initializer
> >> /home/hans/work/src/v4l/v4l-dvb/v4l/uvc_driver.c:1918: warning: (near
> >> initialization for 'uvc_driver.driver.dynids')
> >> make[3]: *** [/home/hans/work/src/v4l/v4l-dvb/v4l/uvc_driver.o] Error 1
> >> make[2]: *** [_module_/home/hans/work/src/v4l/v4l-dvb/v4l] Error 2
> >> make[2]: Leaving directory `/home/hans/work/src/kernels/linux-2.6.18.8'
> >> make[1]: *** [default] Error 2
> >> make[1]: Leaving directory `/home/hans/work/src/v4l/v4l-dvb/v4l'
> >> make: *** [all] Error 2
> >
> > Mauro committed the uvcvideo driver to the v4l-dvb tree two days ago. The
> > patch he based his commit on was intended for submission to the main Linux
> > tree, and as such didn't contain any support for older kernels.
> >
> > The uvcvideo driver supports kernels 2.6.15 upwards. The code can be found
> > in the SVN repository at svn://svn.berlios.de/linux-uvc/linux-uvc/trunk
> >
> > Fixing the driver in the hg tree to build with 2.6.18 would be duplicating
> > work. As I explained in a mail to Mauro, I don't want to drop the SVN
> > repository before the driver hits the main kernel tree, as it would
> > confuse users.
> >
> > What would be the best way to solve this issue ?
> 
> I think the easiest short term solution is to figure out what the first
> kernel is that allows uvcvideo to build and then adjust v4l/versions.txt
> accordingly.

If compiled in the v4l-dvb tree, the driver requires 2.6.22. Otherwise it will need 2.6.26, as it depends on the latest V4L2 API enhancements.

> When the compat stuff is merged with v4l-dvb later, then v4l/versions.txt
> can be adjusted again.


Regards,

Laurent Pinchart

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