Add the set_routing() subdev operation to allow userspace to activate
routes on the R-Car CSI-2 receiver.
Routing for this device is fixed. Validate that the provided route
respects it.
Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
---
drivers/media/platform/rcar-vin/rcar-csi2.c | 37 +++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index 39545e631e42..0f1f667a7aee 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -968,6 +968,42 @@ static int rcsi2_set_pad_format(struct v4l2_subdev *sd,
return 0;
}
+static int rcsi2_set_routing(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ enum v4l2_subdev_format_whence which,
+ struct v4l2_subdev_krouting *routing)
+{
+ unsigned int i;
+ int ret = 0;
+
+ ret = v4l2_subdev_routing_validate(sd, routing,
+ V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
+ if (ret)
+ return ret;
+
+ /*
+ * Routing is fixed for this device.
+ *
+ * Only routes in the form of CSI2:0/x->CSI2:x+1/0 are allowed.
+ *
+ * We have anyway to implement set_routing to mark the route as active.
+ */
+ for (i = 0; i < routing->num_routes; ++i) {
+ const struct v4l2_subdev_route *route = &routing->routes[i];
+ unsigned int vc = route->sink_stream;
+ unsigned int pad = vc + 1;
+
+ if (route->sink_pad != 0)
+ return -EINVAL;
+
+ if (route->source_pad != pad ||
+ route->source_stream != 0)
+ return -EINVAL;
+ }
+
+ return v4l2_subdev_set_routing(sd, state, routing);
+}
+
static int rcsi2_init_cfg(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state)
{
@@ -1029,6 +1065,7 @@ static const struct v4l2_subdev_pad_ops rcar_csi2_pad_ops = {
.init_cfg = rcsi2_init_cfg,
.set_fmt = rcsi2_set_pad_format,
.get_fmt = v4l2_subdev_get_fmt,
+ .set_routing = rcsi2_set_routing,
};
static const struct v4l2_subdev_ops rcar_csi2_subdev_ops = {
--
2.35.1
