[RFC 3/5] media: v4l2-ctrls: Add support for V4L2_CID_LOCATION

[Jacopo Mondi]

Add support for the newly defined V4L2_CID_LOCATION read-only control
used to report the camera device mounting position.

Signed-off-by: Jacopo Mondi <jacopo@xxxxxxxxxx>
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 7 +++++++
 include/uapi/linux/v4l2-controls.h   | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 7d3a33258748..8ab0857df59a 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -943,6 +943,7 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_AUTO_FOCUS_RANGE:		return "Auto Focus, Range";
 	case V4L2_CID_PAN_SPEED:		return "Pan, Speed";
 	case V4L2_CID_TILT_SPEED:		return "Tilt, Speed";
+	case V4L2_CID_LOCATION:			return "Location";
 
 	/* FM Radio Modulator controls */
 	/* Keep the order of the 'case's the same as in v4l2-controls.h! */
@@ -1300,6 +1301,12 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 		break;
 	case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:
 		*type = V4L2_CTRL_TYPE_FWHT_PARAMS;
+	case V4L2_CID_LOCATION:
+		*type = V4L2_CTRL_TYPE_INTEGER;
+		*flags |= V4L2_CTRL_FLAG_READ_ONLY;
+		*min = V4L2_LOCATION_FRONT;
+		*max = V4L2_LOCATION_BACK;
+		*step = 1;
 		break;
 	default:
 		*type = V4L2_CTRL_TYPE_INTEGER;
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 37807f23231e..5c4c7b245921 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -889,6 +889,10 @@ enum v4l2_auto_focus_range {
 #define V4L2_CID_PAN_SPEED			(V4L2_CID_CAMERA_CLASS_BASE+32)
 #define V4L2_CID_TILT_SPEED			(V4L2_CID_CAMERA_CLASS_BASE+33)
 
+#define V4L2_CID_LOCATION			(V4L2_CID_CAMERA_CLASS_BASE+34)
+#define V4L2_LOCATION_FRONT			(0 << 0)
+#define V4L2_LOCATION_BACK			(1 << 0)
+
 /* FM Modulator class control IDs */
 
 #define V4L2_CID_FM_TX_CLASS_BASE		(V4L2_CTRL_CLASS_FM_TX | 0x900)
-- 
2.22.0