xref: /openbmc/linux/sound/firewire/oxfw/oxfw-stream.c (revision e2786ca6)

/*
 * oxfw_stream.c - a part of driver for OXFW970/971 based devices
 *
 * Copyright (c) 2014 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include "oxfw.h"

int snd_oxfw_stream_init_simplex(struct snd_oxfw *oxfw)
{
	int err;

	err = cmp_connection_init(&oxfw->in_conn, oxfw->unit,
				  CMP_INPUT, 0);
	if (err < 0)
		goto end;

	err = amdtp_stream_init(&oxfw->rx_stream, oxfw->unit,
				AMDTP_OUT_STREAM, CIP_NONBLOCKING);
	if (err < 0) {
		amdtp_stream_destroy(&oxfw->rx_stream);
		cmp_connection_destroy(&oxfw->in_conn);
	}
end:
	return err;
}

static void stop_stream(struct snd_oxfw *oxfw)
{
	amdtp_stream_pcm_abort(&oxfw->rx_stream);
	amdtp_stream_stop(&oxfw->rx_stream);
	cmp_connection_break(&oxfw->in_conn);
}

int snd_oxfw_stream_start_simplex(struct snd_oxfw *oxfw)
{
	int err = 0;

	if (amdtp_streaming_error(&oxfw->rx_stream))
		stop_stream(oxfw);

	if (amdtp_stream_running(&oxfw->rx_stream))
		goto end;

	err = cmp_connection_establish(&oxfw->in_conn,
			amdtp_stream_get_max_payload(&oxfw->rx_stream));
	if (err < 0)
		goto end;

	err = amdtp_stream_start(&oxfw->rx_stream,
				 oxfw->in_conn.resources.channel,
				 oxfw->in_conn.speed);
	if (err < 0)
		stop_stream(oxfw);
end:
	return err;
}

void snd_oxfw_stream_stop_simplex(struct snd_oxfw *oxfw)
{
	stop_stream(oxfw);
}

void snd_oxfw_stream_destroy_simplex(struct snd_oxfw *oxfw)
{
	stop_stream(oxfw);

	amdtp_stream_destroy(&oxfw->rx_stream);
	cmp_connection_destroy(&oxfw->in_conn);
}

void snd_oxfw_stream_update_simplex(struct snd_oxfw *oxfw)
{
	if (cmp_connection_update(&oxfw->in_conn) < 0)
		stop_stream(oxfw);
	else
		amdtp_stream_update(&oxfw->rx_stream);
}