path: root/include/media/v4l2-ctrls.h
diff options
authorHans Verkuil <hans.verkuil@cisco.com>2012-09-14 07:15:03 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-10-01 17:07:07 -0300
commit34a6b7d093d8fe738ada191b36648d00bc18b7eb (patch)
tree854584731068996a381af03b95884911c07074b5 /include/media/v4l2-ctrls.h
parenta4f64407b9b33122a58cb78afd73f86d4bb022c4 (diff)
[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/v4l2-ctrls.h')
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.

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