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@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-subdev.c | 31 +++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 16 ++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 7497ad0f6024..eb1103afbfbc 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1155,3 +1155,34 @@ 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);
+
+ kvfree(dst->routes);
+ dst->routes = NULL;
+ dst->num_routes = 0;
+
+ if (src->num_routes == 0) {
+ dst->which = src->which;
+ } else {
+ dst->routes = kvmalloc_array(src->num_routes, sizeof(*src->routes),
+ GFP_KERNEL);
+ if (!dst->routes)
+ return -ENOMEM;
+
+ memcpy(dst->routes, src->routes,
+ src->num_routes * sizeof(*src->routes));
+ dst->num_routes = src->num_routes;
+ dst->which = src->which;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_set_routing);
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 858e18aa5b20..90e9fda6babb 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1436,4 +1436,20 @@ v4l2_subdev_validate_and_lock_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
--
2.25.1
