+#define WM8903_DC_SERVO_4 0x47
+#define WM8903_DC_SERVO_5 0x48
+#define WM8903_DC_SERVO_6 0x49
+#define WM8903_DC_SERVO_7 0x4A
+#define WM8903_DC_SERVO_READBACK_1 0x51
+#define WM8903_DC_SERVO_READBACK_2 0x52
+#define WM8903_DC_SERVO_READBACK_3 0x53
+#define WM8903_DC_SERVO_READBACK_4 0x54