diff options
Diffstat (limited to 'Documentation/video4linux')
| -rw-r--r-- | Documentation/video4linux/v4l2-controls.txt | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt index 43da22b89728..54270df99d5c 100644 --- a/Documentation/video4linux/v4l2-controls.txt +++ b/Documentation/video4linux/v4l2-controls.txt @@ -594,7 +594,11 @@ handler and finally add the first handler to the second. For example: v4l2_ctrl_new_std(&radio_ctrl_handler, &radio_ops, V4L2_CID_AUDIO_MUTE, ...); v4l2_ctrl_new_std(&video_ctrl_handler, &video_ops, V4L2_CID_BRIGHTNESS, ...); v4l2_ctrl_new_std(&video_ctrl_handler, &video_ops, V4L2_CID_CONTRAST, ...); - v4l2_ctrl_add_handler(&video_ctrl_handler, &radio_ctrl_handler); + v4l2_ctrl_add_handler(&video_ctrl_handler, &radio_ctrl_handler, NULL); + +The last argument to v4l2_ctrl_add_handler() is a filter function that allows +you to filter which controls will be added. Set it to NULL if you want to add +all controls. Or you can add specific controls to a handler: |