Index: uspace/lib/c/include/ipc/dev_iface.h
===================================================================
--- uspace/lib/c/include/ipc/dev_iface.h	(revision a17356fd13769fdbaa2f4df26127bb541d940247)
+++ uspace/lib/c/include/ipc/dev_iface.h	(revision 3b05380baa6f8639de10f783b24fc60c68b4be25)
@@ -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,