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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 /drivers/media/v4l2-core | |
| parent | a4f64407b9b33122a58cb78afd73f86d4bb022c4 (diff) | |
| download | linux-34a6b7d093d8fe738ada191b36648d00bc18b7eb.tar.bz2 | |
[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')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-ctrls.c | 25 | ||||
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-device.c | 2 |
2 files changed, 25 insertions, 2 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) { diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c index 1f203b85a637..513969fa695d 100644 --- a/drivers/media/v4l2-core/v4l2-device.c +++ b/drivers/media/v4l2-core/v4l2-device.c @@ -166,7 +166,7 @@ int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, } /* This just returns 0 if either of the two args is NULL */ - err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler); + err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler, NULL); if (err) { if (sd->internal_ops && sd->internal_ops->unregistered) sd->internal_ops->unregistered(sd); |