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-rw-r--r--sound/firewire/cmp.h14
1 files changed, 11 insertions, 3 deletions
diff --git a/sound/firewire/cmp.h b/sound/firewire/cmp.h
index f47de08feb12..ebcb48484fca 100644
--- a/sound/firewire/cmp.h
+++ b/sound/firewire/cmp.h
@@ -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 @@ struct cmp_connection {
__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,