diff options
| author | Laurent Pinchart <laurent.pinchart@skynet.be> | 2009-02-14 19:26:56 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-30 12:42:51 -0300 |
| commit | 72362422f3a9cb66e26fa9f0d90d3ef5241e78ba (patch) | |
| tree | 5a59c61da4a1bf1adf487f3279cb5f2c494b66f7 | |
| parent | 4a5aa62bd5e27d90ceb11bc256de659d5c99e0dc (diff) | |
V4L/DVB (10650): uvcvideo: Initialize streaming parameters with the probe control value
The UVC specification requires SET_CUR requests on the streaming commit control
to use values retrieved from a successful GET_CUR request on the probe control.
Initialize streaming parameters with the probe control current value to make
sure the driver always complies.
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/uvc/uvc_video.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c index 7ebb89539c3..9139086f940 100644 --- a/drivers/media/video/uvc/uvc_video.c +++ b/drivers/media/video/uvc/uvc_video.c @@ -1026,11 +1026,20 @@ int uvc_video_init(struct uvc_video_device *video) */ usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); - /* Some webcams don't suport GET_DEF requests on the probe control. We - * fall back to GET_CUR if GET_DEF fails. + /* Set the streaming probe control with default streaming parameters + * retrieved from the device. Webcams that don't suport GET_DEF + * requests on the probe control will just keep their current streaming + * parameters. */ - if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_DEF)) < 0 && - (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) + if (uvc_get_video_ctrl(video, probe, 1, GET_DEF) == 0) + uvc_set_video_ctrl(video, probe, 1); + + /* Initialize the streaming parameters with the probe control current + * value. This makes sure SET_CUR requests on the streaming commit + * control will always use values retrieved from a successful GET_CUR + * request on the probe control, as required by the UVC specification. + */ + if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) return ret; /* Check if the default format descriptor exists. Use the first |