[PATCH v5 09/11] media: imx219: Introduce the set_routing operation

[Jean-Michel Hautbois <jeanmichel.hautbois@xxxxxxxxxxxxxxxx>]

As we want to use multiplexed streams API, we need to be able to set the
pad routing. Introduce the set_routing operation.

As this operation is required for a multiplexed able sensor, add the
V4L2_SUBDEV_FL_MULTIPLEXED flag.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@xxxxxxxxxxxxxxxx>
---
 drivers/media/i2c/imx219.c | 82 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 79 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index abcaee15c4a0..35b61fad8e35 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -118,6 +118,10 @@
 #define IMX219_PIXEL_ARRAY_WIDTH	3280U
 #define IMX219_PIXEL_ARRAY_HEIGHT	2464U
 
+/* Embedded metadata stream structure */
+#define IMX219_EMBEDDED_LINE_WIDTH	16384
+#define IMX219_NUM_EMBEDDED_LINES	1
+
 struct imx219_reg {
 	u16 address;
 	u8 val;
@@ -784,15 +788,85 @@ static void imx219_init_formats(struct v4l2_subdev_state *state)
 	format->height = supported_modes[0].height;
 	format->field = V4L2_FIELD_NONE;
 	format->colorspace = V4L2_COLORSPACE_RAW;
+
+	if (state->routing.routes[1].flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE) {
+		format = v4l2_state_get_stream_format(state, 0, 1);
+		format->code = MEDIA_BUS_FMT_METADATA_8;
+		format->width = IMX219_EMBEDDED_LINE_WIDTH;
+		format->height = 1;
+		format->field = V4L2_FIELD_NONE;
+		format->colorspace = V4L2_COLORSPACE_DEFAULT;
+	}
 }
 
-static int imx219_init_cfg(struct v4l2_subdev *sd,
-			   struct v4l2_subdev_state *state)
+static int __imx219_set_routing(struct v4l2_subdev *sd,
+				struct v4l2_subdev_state *state)
 {
+	struct v4l2_subdev_route routes[] = {
+		{
+			.source_pad = 0,
+			.source_stream = 0,
+			.flags = V4L2_SUBDEV_ROUTE_FL_IMMUTABLE |
+				 V4L2_SUBDEV_ROUTE_FL_SOURCE |
+				 V4L2_SUBDEV_ROUTE_FL_ACTIVE,
+		},
+		{
+			.source_pad = 0,
+			.source_stream = 1,
+			.flags = V4L2_SUBDEV_ROUTE_FL_SOURCE |
+				 V4L2_SUBDEV_ROUTE_FL_ACTIVE,
+		}
+	};
+
+	struct v4l2_subdev_krouting routing = {
+		.num_routes = ARRAY_SIZE(routes),
+		.routes = routes,
+	};
+
+	int ret;
+
+	ret = v4l2_subdev_set_routing(sd, state, &routing);
+	if (ret)
+		return ret;
+
 	imx219_init_formats(state);
+
 	return 0;
 }
 
+static int imx219_set_routing(struct v4l2_subdev *sd,
+			      struct v4l2_subdev_state *state,
+			      enum v4l2_subdev_format_whence which,
+			      struct v4l2_subdev_krouting *routing)
+{
+	int ret;
+
+	if (routing->num_routes == 0 || routing->num_routes > 2)
+		return -EINVAL;
+
+	v4l2_subdev_lock_state(state);
+
+	ret = __imx219_set_routing(sd, state);
+
+	v4l2_subdev_unlock_state(state);
+
+	return ret;
+}
+
+static int imx219_init_cfg(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_state *state)
+{
+	int ret;
+
+	v4l2_subdev_lock_state(state);
+
+	ret = __imx219_set_routing(sd, state);
+
+	v4l2_subdev_unlock_state(state);
+
+	return ret;
+}
+
 static int imx219_enum_mbus_code(struct v4l2_subdev *sd,
 				 struct v4l2_subdev_state *sd_state,
 				 struct v4l2_subdev_mbus_code_enum *code)
@@ -1251,6 +1325,7 @@ static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
 	.get_fmt		= imx219_get_pad_format,
 	.set_fmt		= imx219_set_pad_format,
 	.get_selection		= imx219_get_selection,
+	.set_routing		= imx219_set_routing,
 	.enum_frame_size	= imx219_enum_frame_size,
 };
 
@@ -1509,7 +1584,8 @@ static int imx219_probe(struct i2c_client *client)
 
 	/* Initialize subdev */
 	imx219->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
-			    V4L2_SUBDEV_FL_HAS_EVENTS;
+			    V4L2_SUBDEV_FL_HAS_EVENTS |
+			    V4L2_SUBDEV_FL_MULTIPLEXED;
 	imx219->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 
 	/* Initialize source pad */
-- 
2.32.0