sound/firewire/motu/motu-pcm.c - arm/linux - Git at Google

 /*
  * motu-pcm.c - a part of driver for MOTU FireWire series
  *
  * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
  *
  * Licensed under the terms of the GNU General Public License, version 2.
  */

 #include <sound/pcm_params.h>
 #include "motu.h"

 static int motu_rate_constraint(struct snd_pcm_hw_params *params,
 				struct snd_pcm_hw_rule *rule)
 {
 	struct snd_motu_packet_format *formats = rule->private;

 	const struct snd_interval *c =
 		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 	struct snd_interval *r =
 		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 	struct snd_interval rates = {
 		.min = UINT_MAX, .max = 0, .integer = 1
 	};
 	unsigned int i, pcm_channels, rate, mode;

 	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
 		rate = snd_motu_clock_rates[i];
 		mode = i / 2;

 		pcm_channels = formats->fixed_part_pcm_chunks[mode] +
 			       formats->differed_part_pcm_chunks[mode];
 		if (!snd_interval_test(c, pcm_channels))
 			continue;

 		rates.min = min(rates.min, rate);
 		rates.max = max(rates.max, rate);
 	}

 	return snd_interval_refine(r, &rates);
 }

 static int motu_channels_constraint(struct snd_pcm_hw_params *params,
 				    struct snd_pcm_hw_rule *rule)
 {
 	struct snd_motu_packet_format *formats = rule->private;

 	const struct snd_interval *r =
 		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 	struct snd_interval *c =
 		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 	struct snd_interval channels = {
 		.min = UINT_MAX, .max = 0, .integer = 1
 	};
 	unsigned int i, pcm_channels, rate, mode;

 	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
 		rate = snd_motu_clock_rates[i];
 		mode = i / 2;

 		if (!snd_interval_test(r, rate))
 			continue;

 		pcm_channels = formats->fixed_part_pcm_chunks[mode] +
 			       formats->differed_part_pcm_chunks[mode];
 		channels.min = min(channels.min, pcm_channels);
 		channels.max = max(channels.max, pcm_channels);
 	}

 	return snd_interval_refine(c, &channels);
 }

 static void limit_channels_and_rates(struct snd_motu *motu,
 				     struct snd_pcm_runtime *runtime,
 				     struct snd_motu_packet_format *formats)
 {
 	struct snd_pcm_hardware *hw = &runtime->hw;
 	unsigned int i, pcm_channels, rate, mode;

 	hw->channels_min = UINT_MAX;
 	hw->channels_max = 0;

 	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
 		rate = snd_motu_clock_rates[i];
 		mode = i / 2;

 		pcm_channels = formats->fixed_part_pcm_chunks[mode] +
 			       formats->differed_part_pcm_chunks[mode];
 		if (pcm_channels == 0)
 			continue;

 		hw->rates |= snd_pcm_rate_to_rate_bit(rate);
 		hw->channels_min = min(hw->channels_min, pcm_channels);
 		hw->channels_max = max(hw->channels_max, pcm_channels);
 	}

 	snd_pcm_limit_hw_rates(runtime);
 }

 static int init_hw_info(struct snd_motu *motu,
 			struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_pcm_hardware *hw = &runtime->hw;
 	struct amdtp_stream *stream;
 	struct snd_motu_packet_format *formats;
 	int err;

 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 		hw->formats = SNDRV_PCM_FMTBIT_S32;
 		stream = &motu->tx_stream;
 		formats = &motu->tx_packet_formats;
 	} else {
 		hw->formats = SNDRV_PCM_FMTBIT_S32;
 		stream = &motu->rx_stream;
 		formats = &motu->rx_packet_formats;
 	}

 	limit_channels_and_rates(motu, runtime, formats);

 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 				  motu_rate_constraint, formats,
 				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 	if (err < 0)
 		return err;
 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 				  motu_channels_constraint, formats,
 				  SNDRV_PCM_HW_PARAM_RATE, -1);
 	if (err < 0)
 		return err;

 	return amdtp_motu_add_pcm_hw_constraints(stream, runtime);
 }

 static int pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;
 	const struct snd_motu_protocol *const protocol = motu->spec->protocol;
 	enum snd_motu_clock_source src;
 	unsigned int rate;
 	int err;

 	err = snd_motu_stream_lock_try(motu);
 	if (err < 0)
 		return err;

 	mutex_lock(&motu->mutex);

 	err = snd_motu_stream_cache_packet_formats(motu);
 	if (err < 0)
 		goto err_locked;

 	err = init_hw_info(motu, substream);
 	if (err < 0)
 		goto err_locked;

 	/*
 	 * When source of clock is not internal or any PCM streams are running,
 	 * available sampling rate is limited at current sampling rate.
 	 */
 	err = protocol->get_clock_source(motu, &src);
 	if (err < 0)
 		goto err_locked;
 	if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL ||
 	    amdtp_stream_pcm_running(&motu->tx_stream) ||
 	    amdtp_stream_pcm_running(&motu->rx_stream)) {
 		err = protocol->get_clock_rate(motu, &rate);
 		if (err < 0)
 			goto err_locked;
 		substream->runtime->hw.rate_min = rate;
 		substream->runtime->hw.rate_max = rate;
 	}

 	snd_pcm_set_sync(substream);

 	mutex_unlock(&motu->mutex);

 	return err;
 err_locked:
 	mutex_unlock(&motu->mutex);
 	snd_motu_stream_lock_release(motu);
 	return err;
 }

 static int pcm_close(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;

 	snd_motu_stream_lock_release(motu);

 	return 0;
 }

 static int capture_hw_params(struct snd_pcm_substream *substream,
 			     struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_motu *motu = substream->private_data;
 	int err;

 	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 					       params_buffer_bytes(hw_params));
 	if (err < 0)
 		return err;

 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		mutex_lock(&motu->mutex);
 		motu->capture_substreams++;
 		mutex_unlock(&motu->mutex);
 	}

 	return 0;
 }
 static int playback_hw_params(struct snd_pcm_substream *substream,
 			      struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_motu *motu = substream->private_data;
 	int err;

 	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 					       params_buffer_bytes(hw_params));
 	if (err < 0)
 		return err;

 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		mutex_lock(&motu->mutex);
 		motu->playback_substreams++;
 		mutex_unlock(&motu->mutex);
 	}

 	return 0;
 }

 static int capture_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;

 	mutex_lock(&motu->mutex);

 	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 		motu->capture_substreams--;

 	snd_motu_stream_stop_duplex(motu);

 	mutex_unlock(&motu->mutex);

 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }

 static int playback_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;

 	mutex_lock(&motu->mutex);

 	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 		motu->playback_substreams--;

 	snd_motu_stream_stop_duplex(motu);

 	mutex_unlock(&motu->mutex);

 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }

 static int capture_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;
 	int err;

 	mutex_lock(&motu->mutex);
 	err = snd_motu_stream_start_duplex(motu, substream->runtime->rate);
 	mutex_unlock(&motu->mutex);
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(&motu->tx_stream);

 	return 0;
 }
 static int playback_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;
 	int err;

 	mutex_lock(&motu->mutex);
 	err = snd_motu_stream_start_duplex(motu, substream->runtime->rate);
 	mutex_unlock(&motu->mutex);
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(&motu->rx_stream);

 	return err;
 }

 static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_motu *motu = substream->private_data;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		amdtp_stream_pcm_trigger(&motu->tx_stream, substream);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }
 static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_motu *motu = substream->private_data;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		amdtp_stream_pcm_trigger(&motu->rx_stream, substream);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;

 	return amdtp_stream_pcm_pointer(&motu->tx_stream);
 }
 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;

 	return amdtp_stream_pcm_pointer(&motu->rx_stream);
 }

 static int capture_ack(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;

 	return amdtp_stream_pcm_ack(&motu->tx_stream);
 }

 static int playback_ack(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;

 	return amdtp_stream_pcm_ack(&motu->rx_stream);
 }

 int snd_motu_create_pcm_devices(struct snd_motu *motu)
 {
 	static const struct snd_pcm_ops capture_ops = {
 		.open      = pcm_open,
 		.close     = pcm_close,
 		.ioctl     = snd_pcm_lib_ioctl,
 		.hw_params = capture_hw_params,
 		.hw_free   = capture_hw_free,
 		.prepare   = capture_prepare,
 		.trigger   = capture_trigger,
 		.pointer   = capture_pointer,
 		.ack       = capture_ack,
 		.page      = snd_pcm_lib_get_vmalloc_page,
 		.mmap      = snd_pcm_lib_mmap_vmalloc,
 	};
 	static const struct snd_pcm_ops playback_ops = {
 		.open      = pcm_open,
 		.close     = pcm_close,
 		.ioctl     = snd_pcm_lib_ioctl,
 		.hw_params = playback_hw_params,
 		.hw_free   = playback_hw_free,
 		.prepare   = playback_prepare,
 		.trigger   = playback_trigger,
 		.pointer   = playback_pointer,
 		.ack       = playback_ack,
 		.page      = snd_pcm_lib_get_vmalloc_page,
 		.mmap      = snd_pcm_lib_mmap_vmalloc,
 	};
 	struct snd_pcm *pcm;
 	int err;

 	err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);
 	if (err < 0)
 		return err;
 	pcm->private_data = motu;
 	strcpy(pcm->name, motu->card->shortname);

 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);

 	return 0;
 }
	/*
	* motu-pcm.c - a part of driver for MOTU FireWire series
	*
	* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
	*
	* Licensed under the terms of the GNU General Public License, version 2.
	*/

	#include <sound/pcm_params.h>
	#include "motu.h"

	static int motu_rate_constraint(struct snd_pcm_hw_params *params,
	struct snd_pcm_hw_rule *rule)
	{
	struct snd_motu_packet_format *formats = rule->private;

	const struct snd_interval *c =
	hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval *r =
	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval rates = {
	.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i, pcm_channels, rate, mode;

	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
	rate = snd_motu_clock_rates[i];
	mode = i / 2;

	pcm_channels = formats->fixed_part_pcm_chunks[mode] +
	formats->differed_part_pcm_chunks[mode];
	if (!snd_interval_test(c, pcm_channels))
	continue;

	rates.min = min(rates.min, rate);
	rates.max = max(rates.max, rate);
	}

	return snd_interval_refine(r, &rates);
	}

	static int motu_channels_constraint(struct snd_pcm_hw_params *params,
	struct snd_pcm_hw_rule *rule)
	{
	struct snd_motu_packet_format *formats = rule->private;

	const struct snd_interval *r =
	hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *c =
	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval channels = {
	.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i, pcm_channels, rate, mode;

	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
	rate = snd_motu_clock_rates[i];
	mode = i / 2;

	if (!snd_interval_test(r, rate))
	continue;

	pcm_channels = formats->fixed_part_pcm_chunks[mode] +
	formats->differed_part_pcm_chunks[mode];
	channels.min = min(channels.min, pcm_channels);
	channels.max = max(channels.max, pcm_channels);
	}

	return snd_interval_refine(c, &channels);
	}

	static void limit_channels_and_rates(struct snd_motu *motu,
	struct snd_pcm_runtime *runtime,
	struct snd_motu_packet_format *formats)
	{
	struct snd_pcm_hardware *hw = &runtime->hw;
	unsigned int i, pcm_channels, rate, mode;

	hw->channels_min = UINT_MAX;
	hw->channels_max = 0;

	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
	rate = snd_motu_clock_rates[i];
	mode = i / 2;

	pcm_channels = formats->fixed_part_pcm_chunks[mode] +
	formats->differed_part_pcm_chunks[mode];
	if (pcm_channels == 0)
	continue;

	hw->rates \|= snd_pcm_rate_to_rate_bit(rate);
	hw->channels_min = min(hw->channels_min, pcm_channels);
	hw->channels_max = max(hw->channels_max, pcm_channels);
	}

	snd_pcm_limit_hw_rates(runtime);
	}

	static int init_hw_info(struct snd_motu *motu,
	struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hardware *hw = &runtime->hw;
	struct amdtp_stream *stream;
	struct snd_motu_packet_format *formats;
	int err;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
	hw->formats = SNDRV_PCM_FMTBIT_S32;
	stream = &motu->tx_stream;
	formats = &motu->tx_packet_formats;
	} else {
	hw->formats = SNDRV_PCM_FMTBIT_S32;
	stream = &motu->rx_stream;
	formats = &motu->rx_packet_formats;
	}

	limit_channels_and_rates(motu, runtime, formats);

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
	motu_rate_constraint, formats,
	SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
	return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
	motu_channels_constraint, formats,
	SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
	return err;

	return amdtp_motu_add_pcm_hw_constraints(stream, runtime);
	}

	static int pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;
	const struct snd_motu_protocol *const protocol = motu->spec->protocol;
	enum snd_motu_clock_source src;
	unsigned int rate;
	int err;

	err = snd_motu_stream_lock_try(motu);
	if (err < 0)
	return err;

	mutex_lock(&motu->mutex);

	err = snd_motu_stream_cache_packet_formats(motu);
	if (err < 0)
	goto err_locked;

	err = init_hw_info(motu, substream);
	if (err < 0)
	goto err_locked;

	/*
	* When source of clock is not internal or any PCM streams are running,
	* available sampling rate is limited at current sampling rate.
	*/
	err = protocol->get_clock_source(motu, &src);
	if (err < 0)
	goto err_locked;
	if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL \|\|
	amdtp_stream_pcm_running(&motu->tx_stream) \|\|
	amdtp_stream_pcm_running(&motu->rx_stream)) {
	err = protocol->get_clock_rate(motu, &rate);
	if (err < 0)
	goto err_locked;
	substream->runtime->hw.rate_min = rate;
	substream->runtime->hw.rate_max = rate;
	}

	snd_pcm_set_sync(substream);

	mutex_unlock(&motu->mutex);

	return err;
	err_locked:
	mutex_unlock(&motu->mutex);
	snd_motu_stream_lock_release(motu);
	return err;
	}

	static int pcm_close(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;

	snd_motu_stream_lock_release(motu);

	return 0;
	}

	static int capture_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct snd_motu *motu = substream->private_data;
	int err;

	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	params_buffer_bytes(hw_params));
	if (err < 0)
	return err;

	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
	mutex_lock(&motu->mutex);
	motu->capture_substreams++;
	mutex_unlock(&motu->mutex);
	}

	return 0;
	}
	static int playback_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct snd_motu *motu = substream->private_data;
	int err;

	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	params_buffer_bytes(hw_params));
	if (err < 0)
	return err;

	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
	mutex_lock(&motu->mutex);
	motu->playback_substreams++;
	mutex_unlock(&motu->mutex);
	}

	return 0;
	}

	static int capture_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;

	mutex_lock(&motu->mutex);

	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
	motu->capture_substreams--;

	snd_motu_stream_stop_duplex(motu);

	mutex_unlock(&motu->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
	}

	static int playback_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;

	mutex_lock(&motu->mutex);

	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
	motu->playback_substreams--;

	snd_motu_stream_stop_duplex(motu);

	mutex_unlock(&motu->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
	}

	static int capture_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;
	int err;

	mutex_lock(&motu->mutex);
	err = snd_motu_stream_start_duplex(motu, substream->runtime->rate);
	mutex_unlock(&motu->mutex);
	if (err >= 0)
	amdtp_stream_pcm_prepare(&motu->tx_stream);

	return 0;
	}
	static int playback_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;
	int err;

	mutex_lock(&motu->mutex);
	err = snd_motu_stream_start_duplex(motu, substream->runtime->rate);
	mutex_unlock(&motu->mutex);
	if (err >= 0)
	amdtp_stream_pcm_prepare(&motu->rx_stream);

	return err;
	}

	static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_motu *motu = substream->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	amdtp_stream_pcm_trigger(&motu->tx_stream, substream);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}
	static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_motu *motu = substream->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	amdtp_stream_pcm_trigger(&motu->rx_stream, substream);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;

	return amdtp_stream_pcm_pointer(&motu->tx_stream);
	}
	static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;

	return amdtp_stream_pcm_pointer(&motu->rx_stream);
	}

	static int capture_ack(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;

	return amdtp_stream_pcm_ack(&motu->tx_stream);
	}

	static int playback_ack(struct snd_pcm_substream *substream)
	{
	struct snd_motu *motu = substream->private_data;

	return amdtp_stream_pcm_ack(&motu->rx_stream);
	}

	int snd_motu_create_pcm_devices(struct snd_motu *motu)
	{
	static const struct snd_pcm_ops capture_ops = {
	.open = pcm_open,
	.close = pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = capture_hw_params,
	.hw_free = capture_hw_free,
	.prepare = capture_prepare,
	.trigger = capture_trigger,
	.pointer = capture_pointer,
	.ack = capture_ack,
	.page = snd_pcm_lib_get_vmalloc_page,
	.mmap = snd_pcm_lib_mmap_vmalloc,
	};
	static const struct snd_pcm_ops playback_ops = {
	.open = pcm_open,
	.close = pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = playback_hw_params,
	.hw_free = playback_hw_free,
	.prepare = playback_prepare,
	.trigger = playback_trigger,
	.pointer = playback_pointer,
	.ack = playback_ack,
	.page = snd_pcm_lib_get_vmalloc_page,
	.mmap = snd_pcm_lib_mmap_vmalloc,
	};
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);
	if (err < 0)
	return err;
	pcm->private_data = motu;
	strcpy(pcm->name, motu->card->shortname);

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);

	return 0;
	}