Index: uspace/lib/drv/include/audio_mixer_iface.h
===================================================================
--- uspace/lib/drv/include/audio_mixer_iface.h	(revision 485a496a811c65c4df2d440e24c403c0f5bb303f)
+++ uspace/lib/drv/include/audio_mixer_iface.h	(revision 485a496a811c65c4df2d440e24c403c0f5bb303f)
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2011 Jan Vesely
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libdrv
+ * @addtogroup usb
+ * @{
+ */
+/** @file
+ * @brief USB host controller interface definition.
+ */
+
+#ifndef LIBDRV_AUDIO_MIXER_IFACE_H_
+#define LIBDRV_AUDIO_MIXER_IFACE_H_
+
+#include <async.h>
+#include <bool.h>
+
+#include "ddf/driver.h"
+
+int audio_mixer_get_info(async_exch_t *, const char **, unsigned *);
+int audio_mixer_get_item_info(async_exch_t *, unsigned,
+    const char **, unsigned *);
+int audio_mixer_get_channel_info(async_exch_t *, unsigned, unsigned,
+    const char **, unsigned *);
+int audio_mixer_channel_mute_set(async_exch_t *, unsigned, unsigned, bool);
+int audio_mixer_channel_mute_get(async_exch_t *, unsigned, unsigned, bool *);
+int audio_mixer_channel_volume_set(async_exch_t *, unsigned, unsigned,
+    unsigned);
+int audio_mixer_channel_volume_get(async_exch_t *, unsigned, unsigned,
+    unsigned *, unsigned *);
+
+
+/** Audio mixer communication interface. */
+typedef struct {
+	int (*get_info)(ddf_fun_t *, const char **, unsigned *);
+	int (*get_item_info)(ddf_fun_t *, unsigned, const char **, unsigned *);
+	int (*get_channel_info)(ddf_fun_t *, unsigned, unsigned,
+	    const char **, unsigned *);
+	int (*channel_mute_set)(ddf_fun_t *, unsigned, unsigned, bool);
+	int (*channel_mute_get)(ddf_fun_t *, unsigned, unsigned, bool *);
+	int (*channel_volume_set)(ddf_fun_t *, unsigned, unsigned, unsigned);
+	int (*channel_volume_get)(ddf_fun_t *, unsigned, unsigned,
+	    unsigned *, unsigned *);
+} audio_mixer_iface_t;
+
+#endif
+/**
+ * @}
+ */
+
Index: uspace/lib/drv/include/remote_audio_mixer.h
===================================================================
--- uspace/lib/drv/include/remote_audio_mixer.h	(revision 485a496a811c65c4df2d440e24c403c0f5bb303f)
+++ uspace/lib/drv/include/remote_audio_mixer.h	(revision 485a496a811c65c4df2d440e24c403c0f5bb303f)
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2011 Jan Vesely
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libdrv
+ * @{
+ */
+/** @file
+ */
+
+#ifndef LIBDRV_REMOTE_AUDIO_MIXER_H_
+#define LIBDRV_REMOTE_AUDIO_MIXER_H_
+
+extern remote_iface_t remote_audio_mixer_iface;
+
+#endif
+
+/**
+ * @}
+ */
+