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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 /drivers/media/v4l2-core/v4l2-ctrls.c
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 'drivers/media/v4l2-core/v4l2-ctrls.c')
-rw-r--r--drivers/media/v4l2-core/v4l2-ctrls.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index f40003550b60..631cdc0e0bda 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1687,7 +1687,8 @@ EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
/* Add the controls from another handler to our own. */
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))
{
struct v4l2_ctrl_ref *ref;
int ret = 0;
@@ -1707,6 +1708,9 @@ int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
/* And control classes */
if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
continue;
+ /* Filter any unwanted controls */
+ if (filter && !filter(ctrl))
+ continue;
ret = handler_new_ref(hdl, ctrl);
if (ret)
break;
@@ -1716,6 +1720,25 @@ int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
}
EXPORT_SYMBOL(v4l2_ctrl_add_handler);
+bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
+{
+ if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
+ return true;
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_MUTE:
+ case V4L2_CID_AUDIO_VOLUME:
+ case V4L2_CID_AUDIO_BALANCE:
+ case V4L2_CID_AUDIO_BASS:
+ case V4L2_CID_AUDIO_TREBLE:
+ case V4L2_CID_AUDIO_LOUDNESS:
+ return true;
+ default:
+ break;
+ }
+ return false;
+}
+EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
+
/* Cluster controls */
void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
{

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