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-rw-r--r--include/sound/ac97_codec.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h
index 446afc3ea27..758f8bf133c 100644
--- a/include/sound/ac97_codec.h
+++ b/include/sound/ac97_codec.h
@@ -265,6 +265,7 @@
/* specific - Analog Devices */
#define AC97_AD_TEST 0x5a /* test register */
+#define AC97_AD_TEST2 0x5c /* undocumented test register 2 */
#define AC97_AD_CODEC_CFG 0x70 /* codec configuration */
#define AC97_AD_JACK_SPDIF 0x72 /* Jack Sense & S/PDIF */
#define AC97_AD_SERIAL_CFG 0x74 /* Serial Configuration */