diff --git a/sound/oss/maestro.h b/sound/oss/maestro.h
new file mode 100644
index 0000000..023ec7f
--- /dev/null
+++ b/sound/oss/maestro.h
@@ -0,0 +1,60 @@
+/*
+ *	Registers for the ESS PCI cards
+ */
+ 
+/*
+ *	Memory access
+ */
+ 
+#define ESS_MEM_DATA		0x00
+#define	ESS_MEM_INDEX		0x02
+
+/*
+ *	AC-97 Codec port. Delay 1uS after each write. This is used to
+ *	talk AC-97 (see intel.com). Write data then register.
+ */
+ 
+#define ESS_AC97_INDEX		0x30		/* byte wide */
+#define ESS_AC97_DATA		0x32
+
+/* 
+ *	Reading is a bit different. You write register|0x80 to ubdex
+ *	delay 1uS poll the low bit of index, when it clears read the
+ *	data value.
+ */
+
+/*
+ *	Control port. Not yet fully understood
+ *	The value 0xC090 gets loaded to it then 0x0000 and 0x2800
+ *	to the data port. Then after 4uS the value 0x300 is written
+ */
+ 
+#define RING_BUS_CTRL_L		0x34
+#define RING_BUS_CTRL_H		0x36
+
+/*
+ *	This is also used during setup. The value 0x17 is written to it
+ */
+ 
+#define ESS_SETUP_18		0x18
+
+/*
+ *	And this one gets 0x000b
+ */
+ 
+#define ESS_SETUP_A2		0xA2
+
+/*
+ *	And this 0x0000
+ */
+ 
+#define ESS_SETUP_A4		0xA4
+#define ESS_SETUP_A6		0xA6
+
+/*
+ *	Stuff to do with Harpo - the wave stuff
+ */
+ 
+#define ESS_WAVETABLE_SIZE	0x14
+#define 	ESS_WAVETABLE_2M	0xA180
+