diff --git a/include/linux/input.h b/include/linux/input.h
index 3e86b61..1be28cb 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -642,6 +642,7 @@
 #define SW_RFKILL_ALL		0x03  /* rfkill master switch, type "any"
 					 set = radio enabled */
 #define SW_RADIO		SW_RFKILL_ALL	/* deprecated */
+#define SW_MICROPHONE_INSERT	0x04  /* set = inserted */
 #define SW_MAX			0x0f
 #define SW_CNT			(SW_MAX+1)