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[v10,30/38] media: subdev: add v4l2_subdev_set_routing helper()

Message ID 20211130141536.891878-31-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 
Add a helper function to set the subdev routing. The helper can be used
from subdev driver's set_routing op to store the routing table.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 27 +++++++++++++++++++++++++++
 include/media/v4l2-subdev.h           | 16 ++++++++++++++++
 2 files changed, 43 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 67f3c14d7398..633e1fccd377 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1153,3 +1153,30 @@  void v4l2_subdev_unlock_state(struct v4l2_subdev_state *state)
 	mutex_unlock(&state->lock);
 }
 EXPORT_SYMBOL_GPL(v4l2_subdev_unlock_state);
+
+int v4l2_subdev_set_routing(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *state,
+			    struct v4l2_subdev_krouting *routing)
+{
+	struct v4l2_subdev_krouting *dst = &state->routing;
+	const struct v4l2_subdev_krouting *src = routing;
+
+	lockdep_assert_held(&state->lock);
+
+	kfree(dst->routes);
+	dst->routes = NULL;
+	dst->num_routes = 0;
+
+	if (src->num_routes > 0) {
+		dst->routes = kmemdup(src->routes,
+				      src->num_routes * sizeof(*src->routes),
+				      GFP_KERNEL);
+		if (!dst->routes)
+			return -ENOMEM;
+
+		dst->num_routes = src->num_routes;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_set_routing);
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 350ee4d9600f..8525f39c2c67 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1439,4 +1439,20 @@  v4l2_subdev_lock_and_return_state(struct v4l2_subdev *sd,
 	return state;
 }
 
+/**
+ * v4l2_subdev_set_routing() - Set given routing to subdev state
+ * @sd: The subdevice
+ * @state: The subdevice state
+ * @routing: Routing that will be copied to subdev state
+ *
+ * This will release old routing table (if any) from the state, allocate
+ * enough space for the given routing, and copy the routing.
+ *
+ * This can be used from the subdev driver's set_routing op, after validating
+ * the routing.
+ */
+int v4l2_subdev_set_routing(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *state,
+			    struct v4l2_subdev_krouting *routing);
+
 #endif