[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>

6 files changed, 29 insertions, 6 deletions

diff --git a/drivers/media/pci/cx88/cx88-blackbird.c b/drivers/media/pci/cx88/cx88-blackbird.c
index 843ffd9e533..def363fb71c 100644
--- a/drivers/media/pci/cx88/cx88-blackbird.c
+++ b/drivers/media/pci/cx88/cx88-blackbird.c
@@ -1236,7 +1236,7 @@ static int cx8802_blackbird_probe(struct cx8802_driver *drv)
 	err = cx2341x_handler_init(&dev->cxhdl, 36);
 	if (err)
 		goto fail_core;
-	v4l2_ctrl_add_handler(&dev->cxhdl.hdl, &core->video_hdl);
+	v4l2_ctrl_add_handler(&dev->cxhdl.hdl, &core->video_hdl, NULL);
 
 	/* blackbird stuff */
 	printk("%s/2: cx23416 based mpeg encoder (blackbird reference design)\n",
diff --git a/drivers/media/pci/cx88/cx88-video.c b/drivers/media/pci/cx88/cx88-video.c
index f6fcc7e763a..a146d50d779 100644
--- a/drivers/media/pci/cx88/cx88-video.c
+++ b/drivers/media/pci/cx88/cx88-video.c
@@ -1795,7 +1795,7 @@ static int __devinit cx8800_initdev(struct pci_dev *pci_dev,
 		if (vc->id == V4L2_CID_CHROMA_AGC)
 			core->chroma_agc = vc;
 	}
-	v4l2_ctrl_add_handler(&core->video_hdl, &core->audio_hdl);
+	v4l2_ctrl_add_handler(&core->video_hdl, &core->audio_hdl, NULL);
 
 	/* load and configure helper modules */
 
diff --git a/drivers/media/platform/s5p-fimc/fimc-capture.c b/drivers/media/platform/s5p-fimc/fimc-capture.c
index 40923885977..ac2ca36039e 100644
--- a/drivers/media/platform/s5p-fimc/fimc-capture.c
+++ b/drivers/media/platform/s5p-fimc/fimc-capture.c
@@ -472,7 +472,7 @@ int fimc_capture_ctrls_create(struct fimc_dev *fimc)
 		return ret;
 
 	return v4l2_ctrl_add_handler(&vid_cap->ctx->ctrls.handler,
-		    fimc->pipeline.subdevs[IDX_SENSOR]->ctrl_handler);
+		    fimc->pipeline.subdevs[IDX_SENSOR]->ctrl_handler, NULL);
 }
 
 static int fimc_capture_set_default_format(struct fimc_dev *fimc);
diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
index f6b1c1f8776..3be92944f8e 100644
--- a/drivers/media/platform/soc_camera/soc_camera.c
+++ b/drivers/media/platform/soc_camera/soc_camera.c
@@ -1184,7 +1184,7 @@ static int soc_camera_probe(struct soc_camera_device *icd)
 	sd->grp_id = soc_camera_grp_id(icd);
 	v4l2_set_subdev_hostdata(sd, icd);
 
-	if (v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler))
+	if (v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL))
 		goto ectrl;
 
 	/* At this point client .probe() should have run already */
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index f40003550b6..631cdc0e0bd 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 1f203b85a63..513969fa695 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);