--- zzzz-none-000/linux-3.10.107/sound/firewire/fcp.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/sound/firewire/fcp.h	2021-02-04 17:41:59.000000000 +0000
@@ -1,8 +1,29 @@
 #ifndef SOUND_FIREWIRE_FCP_H_INCLUDED
 #define SOUND_FIREWIRE_FCP_H_INCLUDED
 
+#define	AVC_PLUG_INFO_BUF_BYTES	4
+
 struct fw_unit;
 
+/*
+ * AV/C Digital Interface Command Set General Specification 4.2
+ * (Sep 2004, 1394TA)
+ */
+enum avc_general_plug_dir {
+	AVC_GENERAL_PLUG_DIR_IN		= 0,
+	AVC_GENERAL_PLUG_DIR_OUT	= 1,
+	AVC_GENERAL_PLUG_DIR_COUNT
+};
+int avc_general_set_sig_fmt(struct fw_unit *unit, unsigned int rate,
+			    enum avc_general_plug_dir dir,
+			    unsigned short plug);
+int avc_general_get_sig_fmt(struct fw_unit *unit, unsigned int *rate,
+			    enum avc_general_plug_dir dir,
+			    unsigned short plug);
+int avc_general_get_plug_info(struct fw_unit *unit, unsigned int subunit_type,
+			      unsigned int subunit_id, unsigned int subfunction,
+			      u8 info[AVC_PLUG_INFO_BUF_BYTES]);
+
 int fcp_avc_transaction(struct fw_unit *unit,
 			const void *command, unsigned int command_size,
 			void *response, unsigned int response_size,