Index: uspace/lib/c/include/ipc/dev_iface.h
===================================================================
--- uspace/lib/c/include/ipc/dev_iface.h	(revision 3e6a98c595287c43d200d28d97f57755342be117)
+++ uspace/lib/c/include/ipc/dev_iface.h	(revision 90c1d80af2d6dd4e1679d88697a28397618465d4)
@@ -36,4 +36,10 @@
 typedef enum {
 	HW_RES_DEV_IFACE = 0,
+
+	/** Audio device mixer interface */
+	AUDIO_MIXER_IFACE,
+	/** Audio device pcm buffer interface */
+	AUDIO_PCM_BUFFER_IFACE,
+
 	/** Character device interface */
 	CHAR_DEV_IFACE,