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authorLaurent Pinchart <laurent.pinchart@skynet.be>2009-05-19 17:08:03 +0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-06-17 01:21:10 +0400
commit04a37e0f32f9882430bc1899899d2ed91b8aaf5b (patch)
tree65af84e6e1165d1878d34c4a3dcefce881f3b955 /Documentation/pcmcia
parentb2d9cc4226fa512aa36fd78738f5069dfce0583d (diff)
downloadlinux-04a37e0f32f9882430bc1899899d2ed91b8aaf5b.tar.xz
V4L/DVB (11837): uvcvideo: Start status polling on device open
Most UVC camera include an interrupt endpoint to report control value changes, video streaming errors and camera button events. The USB controller continuously polls the interrupt endpoint to retrieve such events. This prevents the device from being auto-suspended, and thus consumes power. Reporting video streaming errors don't make sense when the V4L2 device is closed. Control value changes are probably useless as well if nobody listens to the events, although caching will probably have to be completely disabled then. No polling is thus be required when /dev/videoX is not opened. To enable auto-suspend and save power do not poll the interrupt endpoint until the device is open. We lose the ability to detect button events if no application is using the camera. http://bugzilla.kernel.org/show_bug.cgi?id=11948 Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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