sound/firewire/digi00x/digi00x-pcm.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * digi00x-pcm.c - a part of driver for Digidesign Digi 002/003 family
  *
  * Copyright (c) 2014-2015 Takashi Sakamoto
  */

 #include "digi00x.h"

 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 			struct snd_pcm_hw_rule *rule)
 {
 	struct snd_interval *r =
 		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 	const struct snd_interval *c =
 		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 	struct snd_interval t = {
 		.min = UINT_MAX, .max = 0, .integer = 1,
 	};
 	unsigned int i;

 	for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
 		if (!snd_interval_test(c,
 				       snd_dg00x_stream_pcm_channels[i]))
 			continue;

 		t.min = min(t.min, snd_dg00x_stream_rates[i]);
 		t.max = max(t.max, snd_dg00x_stream_rates[i]);
 	}

 	return snd_interval_refine(r, &t);
 }

 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 			    struct snd_pcm_hw_rule *rule)
 {
 	struct snd_interval *c =
 		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 	const struct snd_interval *r =
 		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 	struct snd_interval t = {
 		.min = UINT_MAX, .max = 0, .integer = 1,
 	};
 	unsigned int i;

 	for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
 		if (!snd_interval_test(r, snd_dg00x_stream_rates[i]))
 			continue;

 		t.min = min(t.min, snd_dg00x_stream_pcm_channels[i]);
 		t.max = max(t.max, snd_dg00x_stream_pcm_channels[i]);
 	}

 	return snd_interval_refine(c, &t);
 }

 static int pcm_init_hw_params(struct snd_dg00x *dg00x,
 			      struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_pcm_hardware *hw = &runtime->hw;
 	struct amdtp_stream *s;
 	int err;


 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 		substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
 		s = &dg00x->tx_stream;
 	} else {
 		substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
 		s = &dg00x->rx_stream;
 	}

 	hw->channels_min = 10;
 	hw->channels_max = 18;

 	hw->rates = SNDRV_PCM_RATE_44100 |
 		    SNDRV_PCM_RATE_48000 |
 		    SNDRV_PCM_RATE_88200 |
 		    SNDRV_PCM_RATE_96000;
 	snd_pcm_limit_hw_rates(runtime);

 	err = snd_pcm_hw_rule_add(substream->runtime, 0,
 				  SNDRV_PCM_HW_PARAM_CHANNELS,
 				  hw_rule_channels, NULL,
 				  SNDRV_PCM_HW_PARAM_RATE, -1);
 	if (err < 0)
 		return err;

 	err = snd_pcm_hw_rule_add(substream->runtime, 0,
 				  SNDRV_PCM_HW_PARAM_RATE,
 				  hw_rule_rate, NULL,
 				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 	if (err < 0)
 		return err;

 	return amdtp_dot_add_pcm_hw_constraints(s, substream->runtime);
 }

 static int pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_dg00x *dg00x = substream->private_data;
 	enum snd_dg00x_clock clock;
 	bool detect;
 	unsigned int rate;
 	int err;

 	err = snd_dg00x_stream_lock_try(dg00x);
 	if (err < 0)
 		goto end;

 	err = pcm_init_hw_params(dg00x, substream);
 	if (err < 0)
 		goto err_locked;

 	/* Check current clock source. */
 	err = snd_dg00x_stream_get_clock(dg00x, &clock);
 	if (err < 0)
 		goto err_locked;
 	if (clock != SND_DG00X_CLOCK_INTERNAL) {
 		err = snd_dg00x_stream_check_external_clock(dg00x, &detect);
 		if (err < 0)
 			goto err_locked;
 		if (!detect) {
 			err = -EBUSY;
 			goto err_locked;
 		}
 	}

 	if ((clock != SND_DG00X_CLOCK_INTERNAL) ||
 	    amdtp_stream_pcm_running(&dg00x->rx_stream) ||
 	    amdtp_stream_pcm_running(&dg00x->tx_stream)) {
 		err = snd_dg00x_stream_get_external_rate(dg00x, &rate);
 		if (err < 0)
 			goto err_locked;
 		substream->runtime->hw.rate_min = rate;
 		substream->runtime->hw.rate_max = rate;
 	}

 	snd_pcm_set_sync(substream);
 end:
 	return err;
 err_locked:
 	snd_dg00x_stream_lock_release(dg00x);
 	return err;
 }

 static int pcm_close(struct snd_pcm_substream *substream)
 {
 	struct snd_dg00x *dg00x = substream->private_data;

 	snd_dg00x_stream_lock_release(dg00x);

 	return 0;
 }

 static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_dg00x *dg00x = 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(&dg00x->mutex);
 		dg00x->substreams_counter++;
 		mutex_unlock(&dg00x->mutex);
 	}

 	return 0;
 }

 static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_dg00x *dg00x = 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(&dg00x->mutex);
 		dg00x->substreams_counter++;
 		mutex_unlock(&dg00x->mutex);
 	}

 	return 0;
 }

 static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_dg00x *dg00x = substream->private_data;

 	mutex_lock(&dg00x->mutex);

 	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 		dg00x->substreams_counter--;

 	snd_dg00x_stream_stop_duplex(dg00x);

 	mutex_unlock(&dg00x->mutex);

 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }

 static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_dg00x *dg00x = substream->private_data;

 	mutex_lock(&dg00x->mutex);

 	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 		dg00x->substreams_counter--;

 	snd_dg00x_stream_stop_duplex(dg00x);

 	mutex_unlock(&dg00x->mutex);

 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }

 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_dg00x *dg00x = substream->private_data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int err;

 	mutex_lock(&dg00x->mutex);

 	err = snd_dg00x_stream_start_duplex(dg00x, runtime->rate);
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(&dg00x->tx_stream);

 	mutex_unlock(&dg00x->mutex);

 	return err;
 }

 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_dg00x *dg00x = substream->private_data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int err;

 	mutex_lock(&dg00x->mutex);

 	err = snd_dg00x_stream_start_duplex(dg00x, runtime->rate);
 	if (err >= 0) {
 		amdtp_stream_pcm_prepare(&dg00x->rx_stream);
 		amdtp_dot_reset(&dg00x->rx_stream);
 	}

 	mutex_unlock(&dg00x->mutex);

 	return err;
 }

 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_dg00x *dg00x = substream->private_data;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		amdtp_stream_pcm_trigger(&dg00x->tx_stream, substream);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		amdtp_stream_pcm_trigger(&dg00x->tx_stream, NULL);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_dg00x *dg00x = substream->private_data;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		amdtp_stream_pcm_trigger(&dg00x->rx_stream, substream);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		amdtp_stream_pcm_trigger(&dg00x->rx_stream, NULL);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 {
 	struct snd_dg00x *dg00x = sbstrm->private_data;

 	return amdtp_stream_pcm_pointer(&dg00x->tx_stream);
 }

 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 {
 	struct snd_dg00x *dg00x = sbstrm->private_data;

 	return amdtp_stream_pcm_pointer(&dg00x->rx_stream);
 }

 static int pcm_capture_ack(struct snd_pcm_substream *substream)
 {
 	struct snd_dg00x *dg00x = substream->private_data;

 	return amdtp_stream_pcm_ack(&dg00x->tx_stream);
 }

 static int pcm_playback_ack(struct snd_pcm_substream *substream)
 {
 	struct snd_dg00x *dg00x = substream->private_data;

 	return amdtp_stream_pcm_ack(&dg00x->rx_stream);
 }

 int snd_dg00x_create_pcm_devices(struct snd_dg00x *dg00x)
 {
 	static const struct snd_pcm_ops capture_ops = {
 		.open		= pcm_open,
 		.close		= pcm_close,
 		.ioctl		= snd_pcm_lib_ioctl,
 		.hw_params	= pcm_capture_hw_params,
 		.hw_free	= pcm_capture_hw_free,
 		.prepare	= pcm_capture_prepare,
 		.trigger	= pcm_capture_trigger,
 		.pointer	= pcm_capture_pointer,
 		.ack		= pcm_capture_ack,
 		.page		= snd_pcm_lib_get_vmalloc_page,
 	};
 	static const struct snd_pcm_ops playback_ops = {
 		.open		= pcm_open,
 		.close		= pcm_close,
 		.ioctl		= snd_pcm_lib_ioctl,
 		.hw_params	= pcm_playback_hw_params,
 		.hw_free	= pcm_playback_hw_free,
 		.prepare	= pcm_playback_prepare,
 		.trigger	= pcm_playback_trigger,
 		.pointer	= pcm_playback_pointer,
 		.ack		= pcm_playback_ack,
 		.page		= snd_pcm_lib_get_vmalloc_page,
 	};
 	struct snd_pcm *pcm;
 	int err;

 	err = snd_pcm_new(dg00x->card, dg00x->card->driver, 0, 1, 1, &pcm);
 	if (err < 0)
 		return err;

 	pcm->private_data = dg00x;
 	snprintf(pcm->name, sizeof(pcm->name),
 		 "%s PCM", dg00x->card->shortname);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* digi00x-pcm.c - a part of driver for Digidesign Digi 002/003 family
	*
	* Copyright (c) 2014-2015 Takashi Sakamoto
	*/

	#include "digi00x.h"

	static int hw_rule_rate(struct snd_pcm_hw_params *params,
	struct snd_pcm_hw_rule *rule)
	{
	struct snd_interval *r =
	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	const struct snd_interval *c =
	hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval t = {
	.min = UINT_MAX, .max = 0, .integer = 1,
	};
	unsigned int i;

	for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
	if (!snd_interval_test(c,
	snd_dg00x_stream_pcm_channels[i]))
	continue;

	t.min = min(t.min, snd_dg00x_stream_rates[i]);
	t.max = max(t.max, snd_dg00x_stream_rates[i]);
	}

	return snd_interval_refine(r, &t);
	}

	static int hw_rule_channels(struct snd_pcm_hw_params *params,
	struct snd_pcm_hw_rule *rule)
	{
	struct snd_interval *c =
	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	const struct snd_interval *r =
	hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval t = {
	.min = UINT_MAX, .max = 0, .integer = 1,
	};
	unsigned int i;

	for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
	if (!snd_interval_test(r, snd_dg00x_stream_rates[i]))
	continue;

	t.min = min(t.min, snd_dg00x_stream_pcm_channels[i]);
	t.max = max(t.max, snd_dg00x_stream_pcm_channels[i]);
	}

	return snd_interval_refine(c, &t);
	}

	static int pcm_init_hw_params(struct snd_dg00x *dg00x,
	struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hardware *hw = &runtime->hw;
	struct amdtp_stream *s;
	int err;


	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
	substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
	s = &dg00x->tx_stream;
	} else {
	substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
	s = &dg00x->rx_stream;
	}

	hw->channels_min = 10;
	hw->channels_max = 18;

	hw->rates = SNDRV_PCM_RATE_44100 \|
	SNDRV_PCM_RATE_48000 \|
	SNDRV_PCM_RATE_88200 \|
	SNDRV_PCM_RATE_96000;
	snd_pcm_limit_hw_rates(runtime);

	err = snd_pcm_hw_rule_add(substream->runtime, 0,
	SNDRV_PCM_HW_PARAM_CHANNELS,
	hw_rule_channels, NULL,
	SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
	return err;

	err = snd_pcm_hw_rule_add(substream->runtime, 0,
	SNDRV_PCM_HW_PARAM_RATE,
	hw_rule_rate, NULL,
	SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
	return err;

	return amdtp_dot_add_pcm_hw_constraints(s, substream->runtime);
	}

	static int pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_dg00x *dg00x = substream->private_data;
	enum snd_dg00x_clock clock;
	bool detect;
	unsigned int rate;
	int err;

	err = snd_dg00x_stream_lock_try(dg00x);
	if (err < 0)
	goto end;

	err = pcm_init_hw_params(dg00x, substream);
	if (err < 0)
	goto err_locked;

	/* Check current clock source. */
	err = snd_dg00x_stream_get_clock(dg00x, &clock);
	if (err < 0)
	goto err_locked;
	if (clock != SND_DG00X_CLOCK_INTERNAL) {
	err = snd_dg00x_stream_check_external_clock(dg00x, &detect);
	if (err < 0)
	goto err_locked;
	if (!detect) {
	err = -EBUSY;
	goto err_locked;
	}
	}

	if ((clock != SND_DG00X_CLOCK_INTERNAL) \|\|
	amdtp_stream_pcm_running(&dg00x->rx_stream) \|\|
	amdtp_stream_pcm_running(&dg00x->tx_stream)) {
	err = snd_dg00x_stream_get_external_rate(dg00x, &rate);
	if (err < 0)
	goto err_locked;
	substream->runtime->hw.rate_min = rate;
	substream->runtime->hw.rate_max = rate;
	}

	snd_pcm_set_sync(substream);
	end:
	return err;
	err_locked:
	snd_dg00x_stream_lock_release(dg00x);
	return err;
	}

	static int pcm_close(struct snd_pcm_substream *substream)
	{
	struct snd_dg00x *dg00x = substream->private_data;

	snd_dg00x_stream_lock_release(dg00x);

	return 0;
	}

	static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct snd_dg00x *dg00x = 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(&dg00x->mutex);
	dg00x->substreams_counter++;
	mutex_unlock(&dg00x->mutex);
	}

	return 0;
	}

	static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct snd_dg00x *dg00x = 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(&dg00x->mutex);
	dg00x->substreams_counter++;
	mutex_unlock(&dg00x->mutex);
	}

	return 0;
	}

	static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_dg00x *dg00x = substream->private_data;

	mutex_lock(&dg00x->mutex);

	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
	dg00x->substreams_counter--;

	snd_dg00x_stream_stop_duplex(dg00x);

	mutex_unlock(&dg00x->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
	}

	static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_dg00x *dg00x = substream->private_data;

	mutex_lock(&dg00x->mutex);

	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
	dg00x->substreams_counter--;

	snd_dg00x_stream_stop_duplex(dg00x);

	mutex_unlock(&dg00x->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
	}

	static int pcm_capture_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_dg00x *dg00x = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	mutex_lock(&dg00x->mutex);

	err = snd_dg00x_stream_start_duplex(dg00x, runtime->rate);
	if (err >= 0)
	amdtp_stream_pcm_prepare(&dg00x->tx_stream);

	mutex_unlock(&dg00x->mutex);

	return err;
	}

	static int pcm_playback_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_dg00x *dg00x = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	mutex_lock(&dg00x->mutex);

	err = snd_dg00x_stream_start_duplex(dg00x, runtime->rate);
	if (err >= 0) {
	amdtp_stream_pcm_prepare(&dg00x->rx_stream);
	amdtp_dot_reset(&dg00x->rx_stream);
	}

	mutex_unlock(&dg00x->mutex);

	return err;
	}

	static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_dg00x *dg00x = substream->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	amdtp_stream_pcm_trigger(&dg00x->tx_stream, substream);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	amdtp_stream_pcm_trigger(&dg00x->tx_stream, NULL);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_dg00x *dg00x = substream->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	amdtp_stream_pcm_trigger(&dg00x->rx_stream, substream);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	amdtp_stream_pcm_trigger(&dg00x->rx_stream, NULL);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
	{
	struct snd_dg00x *dg00x = sbstrm->private_data;

	return amdtp_stream_pcm_pointer(&dg00x->tx_stream);
	}

	static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
	{
	struct snd_dg00x *dg00x = sbstrm->private_data;

	return amdtp_stream_pcm_pointer(&dg00x->rx_stream);
	}

	static int pcm_capture_ack(struct snd_pcm_substream *substream)
	{
	struct snd_dg00x *dg00x = substream->private_data;

	return amdtp_stream_pcm_ack(&dg00x->tx_stream);
	}

	static int pcm_playback_ack(struct snd_pcm_substream *substream)
	{
	struct snd_dg00x *dg00x = substream->private_data;

	return amdtp_stream_pcm_ack(&dg00x->rx_stream);
	}

	int snd_dg00x_create_pcm_devices(struct snd_dg00x *dg00x)
	{
	static const struct snd_pcm_ops capture_ops = {
	.open = pcm_open,
	.close = pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = pcm_capture_hw_params,
	.hw_free = pcm_capture_hw_free,
	.prepare = pcm_capture_prepare,
	.trigger = pcm_capture_trigger,
	.pointer = pcm_capture_pointer,
	.ack = pcm_capture_ack,
	.page = snd_pcm_lib_get_vmalloc_page,
	};
	static const struct snd_pcm_ops playback_ops = {
	.open = pcm_open,
	.close = pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = pcm_playback_hw_params,
	.hw_free = pcm_playback_hw_free,
	.prepare = pcm_playback_prepare,
	.trigger = pcm_playback_trigger,
	.pointer = pcm_playback_pointer,
	.ack = pcm_playback_ack,
	.page = snd_pcm_lib_get_vmalloc_page,
	};
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(dg00x->card, dg00x->card->driver, 0, 1, 1, &pcm);
	if (err < 0)
	return err;

	pcm->private_data = dg00x;
	snprintf(pcm->name, sizeof(pcm->name),
	"%s PCM", dg00x->card->shortname);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);

	return 0;
	}