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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2012-09-14 07:15:03 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-10-01 17:07:07 -0300 |
| commit | 34a6b7d093d8fe738ada191b36648d00bc18b7eb (patch) | |
| tree | 854584731068996a381af03b95884911c07074b5 /include/media | |
| parent | a4f64407b9b33122a58cb78afd73f86d4bb022c4 (diff) | |
| download | lwn-34a6b7d093d8fe738ada191b36648d00bc18b7eb.tar.gz lwn-34a6b7d093d8fe738ada191b36648d00bc18b7eb.zip | |
[media] v4l2-ctrls: add a filter function to v4l2_ctrl_add_handler
With a filter function you can control more precisely which controls
are added. This is useful in particular for radio device nodes for
combined TV/Radio cards where you want to show just the radio-specific
controls and not controls like brightness.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-ctrls.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h index 6890f5e11ad0..801adb466bd2 100644 --- a/include/media/v4l2-ctrls.h +++ b/include/media/v4l2-ctrls.h @@ -384,14 +384,28 @@ struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl, * @hdl: The control handler. * @add: The control handler whose controls you want to add to * the @hdl control handler. + * @filter: This function will filter which controls should be added. * - * Does nothing if either of the two is a NULL pointer. + * Does nothing if either of the two handlers is a NULL pointer. + * If @filter is NULL, then all controls are added. Otherwise only those + * controls for which @filter returns true will be added. * In case of an error @hdl->error will be set to the error code (if it * wasn't set already). */ int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl, - struct v4l2_ctrl_handler *add); + struct v4l2_ctrl_handler *add, + bool (*filter)(const struct v4l2_ctrl *ctrl)); +/** v4l2_ctrl_radio_filter() - Standard filter for radio controls. + * @ctrl: The control that is filtered. + * + * This will return true for any controls that are valid for radio device + * nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM + * transmitter class controls. + * + * This function is to be used with v4l2_ctrl_add_handler(). + */ +bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl); /** v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster. * @ncontrols: The number of controls in this cluster. |