diff --git a/libc/kernel/common/linux/tpa2018d1.h b/libc/kernel/common/linux/tpa2018d1.h
index fe06b68..4ae31fc 100644
--- a/libc/kernel/common/linux/tpa2018d1.h
+++ b/libc/kernel/common/linux/tpa2018d1.h
@@ -14,6 +14,14 @@
 
 #include <linux/ioctl.h>
 
+enum tpa2018d1_mode {
+ TPA2018_MODE_OFF,
+ TPA2018_MODE_PLAYBACK,
+ TPA2018_MODE_RINGTONE,
+ TPA2018_MODE_VOICE_CALL,
+ TPA2018_NUM_MODES,
+};
+
 #define TPA2018_IOCTL_MAGIC 'a'
 #define TPA2018_SET_CONFIG _IOW(TPA2018_IOCTL_MAGIC, 1, unsigned)
 #define TPA2018_READ_CONFIG _IOR(TPA2018_IOCTL_MAGIC, 2, unsigned)