--- zzzz-none-000/linux-3.10.107/sound/firewire/cmp.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/sound/firewire/cmp.h	2021-02-04 17:41:59.000000000 +0000
@@ -7,12 +7,17 @@
 
 struct fw_unit;
 
+enum cmp_direction {
+	CMP_INPUT = 0,
+	CMP_OUTPUT,
+};
+
 /**
  * struct cmp_connection - manages an isochronous connection to a device
  * @speed: the connection's actual speed
  *
- * This structure manages (using CMP) an isochronous stream from the local
- * computer to a device's input plug (iPCR).
+ * This structure manages (using CMP) an isochronous stream between the local
+ * computer and a device's input plug (iPCR) and output plug (oPCR).
  *
  * There is no corresponding oPCR created on the local computer, so it is not
  * possible to overlay connections on top of this one.
@@ -26,11 +31,14 @@
 	__be32 last_pcr_value;
 	unsigned int pcr_index;
 	unsigned int max_speed;
+	enum cmp_direction direction;
 };
 
 int cmp_connection_init(struct cmp_connection *connection,
 			struct fw_unit *unit,
-			unsigned int ipcr_index);
+			enum cmp_direction direction,
+			unsigned int pcr_index);
+int cmp_connection_check_used(struct cmp_connection *connection, bool *used);
 void cmp_connection_destroy(struct cmp_connection *connection);
 
 int cmp_connection_establish(struct cmp_connection *connection,