Add v4l2_subdev_get_format_dir() which can be used to find subdev format
for a specific stream on a multiplexed pad. The function will follow the
routes and links until it finds a non-multiplexed pad.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-subdev.c | 96 +++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 26 ++++++++
2 files changed, 122 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 31e279292ea6..f08847341a6b 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1000,6 +1000,102 @@ bool v4l2_subdev_has_route(struct v4l2_subdev_krouting *routing,
}
EXPORT_SYMBOL_GPL(v4l2_subdev_has_route);
+int v4l2_subdev_get_format_dir(struct media_pad *pad, u16 stream,
+ enum v4l2_direction dir,
+ struct v4l2_subdev_format *fmt)
+{
+ struct device *dev = pad->entity->graph_obj.mdev->dev;
+ int ret;
+ int i;
+
+ dev_dbg(dev, "%s '%s':%u:%u %s\n", __func__,
+ pad->entity->name, pad->index, stream,
+ dir == V4L2_DIR_SOURCEWARD ? "sourceward" : "sinkward");
+
+ while (true) {
+ struct v4l2_subdev_krouting routing;
+ struct v4l2_subdev_route *route;
+
+ if (pad->entity->obj_type != MEDIA_ENTITY_TYPE_V4L2_SUBDEV)
+ return -EINVAL;
+
+ ret = v4l2_subdev_link_validate_get_format(pad, fmt);
+ if (ret == 0)
+ return 0;
+ else if (ret != -ENOIOCTLCMD)
+ return ret;
+
+ if (pad->flags &
+ (dir == V4L2_DIR_SINKWARD ? MEDIA_PAD_FL_SOURCE :
+ MEDIA_PAD_FL_SINK)) {
+ pad = media_entity_remote_pad(pad);
+
+ if (!pad)
+ return -EINVAL;
+
+ if (pad->entity->obj_type != MEDIA_ENTITY_TYPE_V4L2_SUBDEV)
+ return -EINVAL;
+
+ ret = v4l2_subdev_link_validate_get_format(pad, fmt);
+ if (ret == 0)
+ return 0;
+ else if (ret != -ENOIOCTLCMD)
+ return ret;
+ }
+
+ ret = v4l2_subdev_get_krouting(media_entity_to_v4l2_subdev(pad->entity), &routing);
+ if (ret)
+ return ret;
+
+ route = NULL;
+ for (i = 0; i < routing.num_routes; ++i) {
+ u16 near_pad = dir == V4L2_DIR_SINKWARD ?
+ routing.routes[i].sink_pad :
+ routing.routes[i].source_pad;
+ u16 near_stream = dir == V4L2_DIR_SINKWARD ?
+ routing.routes[i].sink_stream :
+ routing.routes[i].source_stream;
+
+ if (!(routing.routes[i].flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
+ continue;
+
+ if (near_pad != pad->index)
+ continue;
+
+ if (near_stream != stream)
+ continue;
+
+ if (route) {
+ dev_err(dev,
+ "%s: '%s' has multiple active routes for stream %u\n",
+ __func__, pad->entity->name, stream);
+ v4l2_subdev_free_routing(&routing);
+ return -EINVAL;
+ }
+
+ route = &routing.routes[i];
+ }
+
+ if (!route) {
+ dev_err(dev, "%s: no route found in '%s' for stream %u\n",
+ __func__, pad->entity->name, stream);
+ v4l2_subdev_free_routing(&routing);
+ return -EINVAL;
+ }
+
+ if (dir == V4L2_DIR_SINKWARD) {
+ pad = &pad->entity->pads[route->source_pad];
+ stream = route->source_stream;
+ } else {
+ pad = &pad->entity->pads[route->sink_pad];
+ stream = route->sink_stream;
+ }
+
+ v4l2_subdev_free_routing(&routing);
+ }
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_get_format_dir);
+
int v4l2_subdev_link_validate(struct media_link *link)
{
struct v4l2_subdev *sink;
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 1235d4832b76..9025ef3a67f5 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1249,4 +1249,30 @@ void v4l2_subdev_cpy_routing(struct v4l2_subdev_krouting *dst,
bool v4l2_subdev_has_route(struct v4l2_subdev_krouting *routing,
unsigned int pad0, unsigned int pad1);
+/**
+ * enum v4l2_direction - Direction either towards the source or the sink
+ *
+ * @V4L2_DIR_SOURCEWARD: Direction towards the source.
+ * @V4L2_DIR_SINKWARD: Direction towards the sink.
+ */
+enum v4l2_direction {
+ V4L2_DIR_SOURCEWARD,
+ V4L2_DIR_SINKWARD,
+};
+
+/**
+ * v4l2_subdev_get_format_dir() - Find format by following streams
+ * @pad: The pad from which to start the search
+ * @stream: The stream for which we want to find the format
+ * @dir: The direction of the search
+ * @fmt: Pointer to &struct v4l2_subdev_format where the found format is stored
+ *
+ * This function attempts to find v4l2_subdev_format for a specific stream on a
+ * multiplexed pad by following the stream using routes and links to the specified
+ * direction, until a non-multiplexed pad is found.
+ */
+int v4l2_subdev_get_format_dir(struct media_pad *pad, u16 stream,
+ enum v4l2_direction dir,
+ struct v4l2_subdev_format *fmt);
+
#endif
--
2.25.1
