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[v10,38/38] media: subdev: Add for_each_active_route() macro

Message ID 20211130141536.891878-39-tomi.valkeinen@ideasonboard.com
State New
Headers show
Series v4l: subdev internal routing and streams | expand

Commit Message

Tomi Valkeinen Nov. 30, 2021, 2:15 p.m. UTC 
From: Jacopo Mondi <jacopo+renesas@jmondi.org>

Add a for_each_active_route() macro to replace the repeated pattern
of iterating on the active routes of a routing table.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 20 ++++++++++++++++++++
 include/media/v4l2-subdev.h           | 13 +++++++++++++
 2 files changed, 33 insertions(+)
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Patch

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index dc31118adc6b..dca2bea180ec 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1603,3 +1603,23 @@  int v4l2_subdev_routing_validate_1_to_1(const struct v4l2_subdev_krouting *routi
 	return 0;
 }
 EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate_1_to_1);
+
+struct v4l2_subdev_route *
+__v4l2_subdev_next_active_route(const struct v4l2_subdev_krouting *routing,
+				struct v4l2_subdev_route *route)
+{
+	if (route)
+		++route;
+	else
+		route = &routing->routes[0];
+
+	for (; route < routing->routes + routing->num_routes; ++route) {
+		if (!(route->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
+			continue;
+
+		return route;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(__v4l2_subdev_next_active_route);
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index a0c122c9f51e..9754913b34f8 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1586,4 +1586,17 @@  int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
  */
 int v4l2_subdev_routing_validate_1_to_1(const struct v4l2_subdev_krouting *routing);
 
+struct v4l2_subdev_route *
+__v4l2_subdev_next_active_route(const struct v4l2_subdev_krouting *routing,
+				struct v4l2_subdev_route *route);
+
+/**
+ * for_each_active_route - iterate on all active routes of a routing table
+ * @routing: The routing table
+ * @route: The route iterator
+ */
+#define for_each_active_route(routing, route) \
+	for ((route) = NULL;                  \
+	     ((route) = __v4l2_subdev_next_active_route((routing), (route)));)
+
 #endif