platform/chrome: cros_ec_typec: Factor out PD identity parsing

Factor out the PD identity parsing code into a separate function. This
way it can be re-used for Cable PD identity parsing in future patches.

No functional changes are introduced by this patch.
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
Link: https://lore.kernel.org/r/20201116201150.2919178-6-pmalani@chromium.org

drivers/platform/chrome/cros_ec_typec.c

@@ -655,6 +655,28 @@ static int cros_typec_register_altmodes(struct cros_typec_data *typec, int port_
 	return ret;
 }
 
+/*
+ * Parse the PD identity data from the EC PD discovery responses and copy that to the supplied
+ * PD identity struct.
+ */
+static void cros_typec_parse_pd_identity(struct usb_pd_identity *id,
+					 struct ec_response_typec_discovery *disc)
+{
+	int i;
+
+	/* First, update the PD identity VDOs for the partner. */
+	if (disc->identity_count > 0)
+		id->id_header = disc->discovery_vdo[0];
+	if (disc->identity_count > 1)
+		id->cert_stat = disc->discovery_vdo[1];
+	if (disc->identity_count > 2)
+		id->product = disc->discovery_vdo[2];
+
+	/* Copy the remaining identity VDOs till a maximum of 6. */
+	for (i = 3; i < disc->identity_count && i < VDO_MAX_OBJECTS; i++)
+		id->vdo[i - 3] = disc->discovery_vdo[i];
+}
+
 static int cros_typec_handle_sop_disc(struct cros_typec_data *typec, int port_num)
 {
 	struct cros_typec_port *port = typec->ports[port_num];
@@ -664,7 +686,6 @@ static int cros_typec_handle_sop_disc(struct cros_typec_data *typec, int port_nu
 		.partner_type = TYPEC_PARTNER_SOP,
 	};
 	int ret = 0;
-	int i;
 
 	if (!port->partner) {
 		dev_err(typec->dev,
@@ -682,17 +703,7 @@ static int cros_typec_handle_sop_disc(struct cros_typec_data *typec, int port_nu
 		goto disc_exit;
 	}
 
-	/* First, update the PD identity VDOs for the partner. */
-	if (sop_disc->identity_count > 0)
-		port->p_identity.id_header = sop_disc->discovery_vdo[0];
-	if (sop_disc->identity_count > 1)
-		port->p_identity.cert_stat = sop_disc->discovery_vdo[1];
-	if (sop_disc->identity_count > 2)
-		port->p_identity.product = sop_disc->discovery_vdo[2];
-
-	/* Copy the remaining identity VDOs till a maximum of 6. */
-	for (i = 3; i < sop_disc->identity_count && i < VDO_MAX_OBJECTS; i++)
-		port->p_identity.vdo[i - 3] = sop_disc->discovery_vdo[i];
+	cros_typec_parse_pd_identity(&port->p_identity, sop_disc);
 
 	ret = typec_partner_set_identity(port->partner);
 	if (ret < 0) {