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Subject[PATCH v16 13/20] media: subdev: add "opposite" stream helper funcs
Date
Add two helper functions to make dealing with streams easier:

v4l2_subdev_routing_find_opposite_end - given a routing table and a pad
+ stream, return the pad + stream on the opposite side of the subdev.

v4l2_subdev_state_get_opposite_stream_format - return a pointer to the
format on the pad + stream on the opposite side from the given pad +
stream.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
---
drivers/media/v4l2-core/v4l2-subdev.c | 49 +++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 36 ++++++++++++++++++++
2 files changed, 85 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 2a80ea49c814..458124da9c5b 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1523,6 +1523,55 @@ v4l2_subdev_state_get_stream_compose(struct v4l2_subdev_state *state,
}
EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_stream_compose);

+int v4l2_subdev_routing_find_opposite_end(const struct v4l2_subdev_krouting *routing,
+ u32 pad, u32 stream, u32 *other_pad,
+ u32 *other_stream)
+{
+ unsigned int i;
+
+ for (i = 0; i < routing->num_routes; ++i) {
+ struct v4l2_subdev_route *route = &routing->routes[i];
+
+ if (route->source_pad == pad &&
+ route->source_stream == stream) {
+ if (other_pad)
+ *other_pad = route->sink_pad;
+ if (other_stream)
+ *other_stream = route->sink_stream;
+ return 0;
+ }
+
+ if (route->sink_pad == pad && route->sink_stream == stream) {
+ if (other_pad)
+ *other_pad = route->source_pad;
+ if (other_stream)
+ *other_stream = route->source_stream;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_routing_find_opposite_end);
+
+struct v4l2_mbus_framefmt *
+v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
+ u32 pad, u32 stream)
+{
+ u32 other_pad, other_stream;
+ int ret;
+
+ ret = v4l2_subdev_routing_find_opposite_end(&state->routing,
+ pad, stream,
+ &other_pad, &other_stream);
+ if (ret)
+ return NULL;
+
+ return v4l2_subdev_state_get_stream_format(state, other_pad,
+ other_stream);
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format);
+
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */

#endif /* CONFIG_MEDIA_CONTROLLER */
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index d6273ad2eea8..6f4719e28ad1 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1527,6 +1527,42 @@ struct v4l2_rect *
v4l2_subdev_state_get_stream_compose(struct v4l2_subdev_state *state,
unsigned int pad, u32 stream);

+/**
+ * v4l2_subdev_routing_find_opposite_end() - Find the opposite stream
+ * @routing: routing used to find the opposite side
+ * @pad: pad id
+ * @stream: stream id
+ * @other_pad: pointer used to return the opposite pad
+ * @other_stream: pointer used to return the opposite stream
+ *
+ * This function uses the routing table to find the pad + stream which is
+ * opposite the given pad + stream.
+ *
+ * @other_pad and/or @other_stream can be NULL if the caller does not need the
+ * value.
+ *
+ * Returns 0 on success, or -EINVAL if no matching route is found.
+ */
+int v4l2_subdev_routing_find_opposite_end(const struct v4l2_subdev_krouting *routing,
+ u32 pad, u32 stream, u32 *other_pad,
+ u32 *other_stream);
+
+/**
+ * v4l2_subdev_state_get_opposite_stream_format() - Get pointer to opposite
+ * stream format
+ * @state: subdevice state
+ * @pad: pad id
+ * @stream: stream id
+ *
+ * This returns a pointer to &struct v4l2_mbus_framefmt for the pad + stream
+ * that is opposite the given pad + stream in the subdev state.
+ *
+ * If the state does not contain the given pad + stream, NULL is returned.
+ */
+struct v4l2_mbus_framefmt *
+v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
+ u32 pad, u32 stream);
+
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */

#endif /* CONFIG_MEDIA_CONTROLLER */
--
2.34.1
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