Index: uspace/lib/c/include/device/hw_res.h
===================================================================
--- uspace/lib/c/include/device/hw_res.h	(revision eceff5f61ce871257409875152a1d0af843c1455)
+++ uspace/lib/c/include/device/hw_res.h	(revision bd5860f944cab76959e62b20338bfd5e884e4f9a)
@@ -53,4 +53,5 @@
 	HW_RES_ENABLE_INTERRUPT,
 	HW_RES_DMA_CHANNEL_SETUP,
+	HW_RES_DMA_CHANNEL_REMAIN,
 } hw_res_method_t;
 
@@ -116,4 +117,5 @@
 extern int hw_res_dma_channel_setup(async_sess_t *, unsigned int, uint32_t,
     uint16_t, uint8_t);
+extern int hw_res_dma_channel_remain(async_sess_t *, unsigned);
 
 #endif
Index: uspace/lib/c/include/device/hw_res_parsed.h
===================================================================
--- uspace/lib/c/include/device/hw_res_parsed.h	(revision eceff5f61ce871257409875152a1d0af843c1455)
+++ uspace/lib/c/include/device/hw_res_parsed.h	(revision bd5860f944cab76959e62b20338bfd5e884e4f9a)
@@ -139,5 +139,6 @@
 }
 
-extern int hw_res_list_parse(hw_resource_list_t *, hw_res_list_parsed_t *, int);
+extern int hw_res_list_parse(
+    const hw_resource_list_t *, hw_res_list_parsed_t *, int);
 extern int hw_res_get_list_parsed(async_sess_t *, hw_res_list_parsed_t *, int);
 
Index: uspace/lib/c/include/ipc/dev_iface.h
===================================================================
--- uspace/lib/c/include/ipc/dev_iface.h	(revision eceff5f61ce871257409875152a1d0af843c1455)
+++ uspace/lib/c/include/ipc/dev_iface.h	(revision bd5860f944cab76959e62b20338bfd5e884e4f9a)
@@ -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,
Index: uspace/lib/c/include/macros.h
===================================================================
--- uspace/lib/c/include/macros.h	(revision eceff5f61ce871257409875152a1d0af843c1455)
+++ uspace/lib/c/include/macros.h	(revision bd5860f944cab76959e62b20338bfd5e884e4f9a)
@@ -40,4 +40,5 @@
 #define abs(a)     ((a) >= 0 ? (a) : -(a))
 
+#define ARRAY_SIZE(array)   (sizeof(array) / sizeof(array[0]))
 
 #define KiB2SIZE(kb)  ((kb) << 10)