diff --git a/include/linux/input.h b/include/linux/input.h
index 3e86b61d2e4cf6fbd26320f0aad6653705c237bb..1be28cbbc57bcdfa0746377df47a1f5d33de8858 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -642,6 +642,7 @@ struct input_absinfo {
 #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)