Index: uspace/drv/audio/hdaudio/pcm_iface.c
===================================================================
--- uspace/drv/audio/hdaudio/pcm_iface.c	(revision 93c3163d85dbf285fc087252626c487aef284ce4)
+++ uspace/drv/audio/hdaudio/pcm_iface.c	(revision 93c3163d85dbf285fc087252626c487aef284ce4)
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2014 Jiri Svoboda
+ * 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 hdaudio
+ * @{
+ */
+/** @file High Definition Audio PCM interface
+ */
+
+#include <async.h>
+#include <audio_pcm_iface.h>
+#include <ddf/log.h>
+#include <errno.h>
+#include <pcm/sample_format.h>
+#include <stdbool.h>
+
+static int hda_get_info_str(ddf_fun_t *, const char **);
+static unsigned hda_query_cap(ddf_fun_t *, audio_cap_t);
+static int hda_test_format(ddf_fun_t *, unsigned *, unsigned *,
+    pcm_sample_format_t *);
+static int hda_get_buffer(ddf_fun_t *, void **, size_t *);
+static int hda_get_buffer_position(ddf_fun_t *, size_t *);
+static int hda_set_event_session(ddf_fun_t *, async_sess_t *);
+static async_sess_t *hda_get_event_session(ddf_fun_t *);
+static int hda_release_buffer(ddf_fun_t *);
+static int hda_start_playback(ddf_fun_t *, unsigned, unsigned, unsigned,
+    pcm_sample_format_t);
+static int hda_stop_playback(ddf_fun_t *, bool);
+static int hda_start_capture(ddf_fun_t *, unsigned, unsigned, unsigned,
+    pcm_sample_format_t);
+static int hda_stop_capture(ddf_fun_t *, bool);
+
+audio_pcm_iface_t hda_pcm_iface = {
+	.get_info_str = hda_get_info_str,
+	.test_format = hda_test_format,
+	.query_cap = hda_query_cap,
+
+	.get_buffer = hda_get_buffer,
+	.release_buffer = hda_release_buffer,
+	.set_event_session = hda_set_event_session,
+	.get_event_session = hda_get_event_session,
+	.get_buffer_pos = hda_get_buffer_position,
+
+	.start_playback = hda_start_playback,
+	.stop_playback = hda_stop_playback,
+
+	.start_capture = hda_start_capture,
+	.stop_capture = hda_stop_capture
+};
+
+static int hda_get_info_str(ddf_fun_t *fun, const char **name)
+{
+	ddf_msg(LVL_NOTE, "hda_get_info_str()");
+	return ENOTSUP;
+}
+
+static unsigned hda_query_cap(ddf_fun_t *fun, audio_cap_t cap)
+{
+	ddf_msg(LVL_NOTE, "hda_query_cap()");
+	return ENOTSUP;
+}
+
+static int hda_test_format(ddf_fun_t *fun, unsigned *channels,
+    unsigned *rate, pcm_sample_format_t *format)
+{
+	ddf_msg(LVL_NOTE, "hda_test_format()");
+	return ENOTSUP;
+}
+
+static int hda_get_buffer(ddf_fun_t *fun, void **buffer, size_t *size)
+{
+	ddf_msg(LVL_NOTE, "hda_get_buffer()");
+	return ENOTSUP;
+}
+
+static int hda_get_buffer_position(ddf_fun_t *fun, size_t *pos)
+{
+	ddf_msg(LVL_NOTE, "hda_get_buffer_position()");
+	return ENOTSUP;
+}
+
+static int hda_set_event_session(ddf_fun_t *fun, async_sess_t *sess)
+{
+	ddf_msg(LVL_NOTE, "hda_set_event_session()");
+	return ENOTSUP;
+}
+
+static async_sess_t *hda_get_event_session(ddf_fun_t *fun)
+{
+	ddf_msg(LVL_NOTE, "hda_get_event_session()");
+	return NULL;
+}
+
+static int hda_release_buffer(ddf_fun_t *fun)
+{
+	ddf_msg(LVL_NOTE, "hda_release_buffer()");
+	return ENOTSUP;
+}
+
+static int hda_start_playback(ddf_fun_t *fun, unsigned frames,
+    unsigned channels, unsigned rate, pcm_sample_format_t format)
+{
+	ddf_msg(LVL_NOTE, "hda_start_playback()");
+	return ENOTSUP;
+}
+
+static int hda_stop_playback(ddf_fun_t *fun, bool immediate)
+{
+	ddf_msg(LVL_NOTE, "hda_stop_playback()");
+	return ENOTSUP;
+}
+
+static int hda_start_capture(ddf_fun_t *fun, unsigned frames, unsigned channels,
+    unsigned rate, pcm_sample_format_t format)
+{
+	ddf_msg(LVL_NOTE, "hda_start_capture()");
+	return ENOTSUP;
+}
+
+static int hda_stop_capture(ddf_fun_t *fun, bool immediate)
+{
+	ddf_msg(LVL_NOTE, "hda_stop_capture()");
+	return ENOTSUP;
+}
+
+/** @}
+ */
