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diff --git a/sound/soc/codecs/ad1980.h b/sound/soc/codecs/ad1980.h
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+/*
+ * ad1980.h -- ad1980 Soc Audio driver
+ *
+ * WARNING:
+ *
+ * Because Analog Devices Inc. discontinued the ad1980 sound chip since
+ * Sep. 2009, this ad1980 driver is not maintained, tested and supported
+ * by ADI now.
+ */
+
+#ifndef _AD1980_H
+#define _AD1980_H
+/* Bit definition of Power-Down Control/Status Register */
+#define ADC 0x0001
+#define DAC 0x0002
+#define ANL 0x0004
+#define REF 0x0008
+#define PR0 0x0100
+#define PR1 0x0200
+#define PR2 0x0400
+#define PR3 0x0800
+#define PR4 0x1000
+#define PR5 0x2000
+#define PR6 0x4000
+
+#endif