[PATCH v3 27/31] adv748x: afe: add routing support

[Jacopo Mondi <jacopo+renesas@jmondi.org>]

From: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

The adv748x afe has eight analog sink pads, currently one of them is
chosen to be the active route based on device tree configuration. With
the new routing API it's possible to expose and change which of the
eight sink pads are routed to the source pad.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
---
 drivers/media/i2c/adv748x/adv748x-afe.c | 65 +++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/drivers/media/i2c/adv748x/adv748x-afe.c b/drivers/media/i2c/adv748x/adv748x-afe.c
index dbbb1e4d6363..3f770f71413f 100644
--- a/drivers/media/i2c/adv748x/adv748x-afe.c
+++ b/drivers/media/i2c/adv748x/adv748x-afe.c
@@ -39,6 +39,9 @@
 #define ADV748X_AFE_STD_PAL_SECAM			0xe
 #define ADV748X_AFE_STD_PAL_SECAM_PED			0xf
 
+#define ADV748X_AFE_ROUTES_MAX ((ADV748X_AFE_SINK_AIN7 - \
+				ADV748X_AFE_SINK_AIN0) + 1)
+
 static int adv748x_afe_read_ro_map(struct adv748x_state *state, u8 reg)
 {
 	int ret;
@@ -383,10 +386,72 @@ static int adv748x_afe_set_format(struct v4l2_subdev *sd,
 	return 0;
 }
 
+static int adv748x_afe_get_routing(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_krouting *routing)
+{
+	struct adv748x_afe *afe = adv748x_sd_to_afe(sd);
+	struct v4l2_subdev_route *r = routing->routes;
+	unsigned int i;
+
+	/* There is one possible route from each sink */
+	if (routing->num_routes < ADV748X_AFE_ROUTES_MAX) {
+		routing->num_routes = ADV748X_AFE_ROUTES_MAX;
+		return -ENOSPC;
+	}
+
+	routing->num_routes = ADV748X_AFE_ROUTES_MAX;
+
+	for (i = ADV748X_AFE_SINK_AIN0; i <= ADV748X_AFE_SINK_AIN7; i++) {
+		r->sink_pad = i;
+		r->sink_stream = 0;
+		r->source_pad = ADV748X_AFE_SOURCE;
+		r->source_stream = 0;
+		r->flags = afe->input == i ? V4L2_SUBDEV_ROUTE_FL_ACTIVE : 0;
+		r++;
+	}
+
+	return 0;
+}
+
+static int adv748x_afe_set_routing(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_krouting *routing)
+{
+	struct adv748x_afe *afe = adv748x_sd_to_afe(sd);
+	struct v4l2_subdev_route *r = routing->routes;
+	int input = -1;
+	unsigned int i;
+
+	if (routing->num_routes > ADV748X_AFE_ROUTES_MAX)
+		return -ENOSPC;
+
+	for (i = 0; i < routing->num_routes; i++) {
+		if (r->sink_pad > ADV748X_AFE_SINK_AIN7 ||
+		    r->sink_stream != 0 ||
+		    r->source_pad != ADV748X_AFE_SOURCE ||
+		    r->source_stream != 0)
+			return -EINVAL;
+
+		if (r->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE) {
+			if (input != -1)
+				return -EMLINK;
+
+			input = r->sink_pad;
+		}
+		r++;
+	}
+
+	if (input != -1)
+		afe->input = input;
+
+	return 0;
+}
+
 static const struct v4l2_subdev_pad_ops adv748x_afe_pad_ops = {
 	.enum_mbus_code = adv748x_afe_enum_mbus_code,
 	.set_fmt = adv748x_afe_set_format,
 	.get_fmt = adv748x_afe_get_format,
+	.get_routing = adv748x_afe_get_routing,
+	.set_routing = adv748x_afe_set_routing,
 };
 
 /* -----------------------------------------------------------------------------
-- 
2.20.1