diff mbox series

[RFC,04/11] v4l: subdev: routing kernel helper functions

Message ID 20210507123558.146948-5-tomi.valkeinen@ideasonboard.com
State New
Headers show
Series v4l2: multistream support via stream based configuration | expand

Commit Message

Tomi Valkeinen May 7, 2021, 12:35 p.m. UTC 
Add helper functions for routing. These helpers make it easier for the
drivers to use struct v4l2_subdev_krouting.

TODO: add docs
TODO: fix according to comments

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 89 +++++++++++++++++++++++++++
 include/media/v4l2-subdev.h           | 15 +++++
 2 files changed, 104 insertions(+)
diff mbox series

Patch

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 28e84453fe28..7b40bf34f8a3 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -912,6 +912,95 @@  v4l2_subdev_link_validate_get_format(struct media_pad *pad,
 	return -EINVAL;
 }
 
+int v4l2_subdev_get_routing(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *state,
+			    struct v4l2_subdev_krouting *routing)
+{
+	int ret;
+
+	routing->which = state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
+	routing->routes = NULL;
+	routing->num_routes = 0;
+
+	ret = v4l2_subdev_call(sd, pad, get_routing, state, routing);
+	if (ret == 0)
+		return 0;
+	if (ret != -ENOSPC)
+		return ret;
+
+	routing->routes = kvmalloc_array(routing->num_routes,
+					 sizeof(*routing->routes), GFP_KERNEL);
+	if (!routing->routes)
+		return -ENOMEM;
+
+	ret = v4l2_subdev_call(sd, pad, get_routing, state, routing);
+	if (ret) {
+		kvfree(routing->routes);
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_get_routing);
+
+void v4l2_subdev_free_routing(struct v4l2_subdev_krouting *routing)
+{
+	kvfree(routing->routes);
+	routing->routes = NULL;
+	routing->num_routes = 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_free_routing);
+
+void v4l2_subdev_cpy_routing(struct v4l2_subdev_krouting *dst,
+			     const struct v4l2_subdev_krouting *src)
+{
+	memcpy(dst->routes, src->routes,
+	       src->num_routes * sizeof(*src->routes));
+	dst->num_routes = src->num_routes;
+	dst->which = src->which;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_cpy_routing);
+
+int v4l2_subdev_dup_routing(struct v4l2_subdev_krouting *dst,
+			    const struct v4l2_subdev_krouting *src)
+{
+	v4l2_subdev_free_routing(dst);
+
+	if (src->num_routes == 0) {
+		dst->which = src->which;
+		return 0;
+	}
+
+	dst->routes = kvmalloc_array(src->num_routes, sizeof(*src->routes),
+				     GFP_KERNEL);
+	if (!dst->routes)
+		return -ENOMEM;
+
+	v4l2_subdev_cpy_routing(dst, src);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_dup_routing);
+
+bool v4l2_subdev_has_route(struct v4l2_subdev_krouting *routing,
+			   unsigned int pad0, unsigned int pad1)
+{
+	unsigned int i;
+
+	for (i = 0; i < routing->num_routes; ++i) {
+		struct v4l2_subdev_route *route = &routing->routes[i];
+
+		if (!(route->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
+			continue;
+
+		if (route->sink_pad == pad0 && route->source_pad == pad1)
+			return true;
+	}
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_has_route);
+
 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 4cd1a3818c68..63a36eead7dc 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1252,4 +1252,19 @@  extern const struct v4l2_subdev_ops v4l2_subdev_call_wrappers;
 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
 			      const struct v4l2_event *ev);
 
+int v4l2_subdev_get_routing(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *state,
+			    struct v4l2_subdev_krouting *routing);
+
+void v4l2_subdev_free_routing(struct v4l2_subdev_krouting *routing);
+
+int v4l2_subdev_dup_routing(struct v4l2_subdev_krouting *dst,
+			    const struct v4l2_subdev_krouting *src);
+
+void v4l2_subdev_cpy_routing(struct v4l2_subdev_krouting *dst,
+			     const struct v4l2_subdev_krouting *src);
+
+bool v4l2_subdev_has_route(struct v4l2_subdev_krouting *routing,
+			   unsigned int pad0, unsigned int pad1);
+
 #endif