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-rw-r--r--include/sound/es1688.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/es1688.h b/include/sound/es1688.h
index 3ec7ecb..f752dd3 100644
--- a/include/sound/es1688.h
+++ b/include/sound/es1688.h
@@ -29,6 +29,7 @@
#define ES1688_HW_AUTO 0x0000
#define ES1688_HW_688 0x0001
#define ES1688_HW_1688 0x0002
+#define ES1688_HW_UNDEF 0x0003
struct snd_es1688 {
unsigned long port; /* port of ESS chip */