sound/firewire/dice/dice-pcm.c - kernel/msm-4.9 - Gitiles

 /*
  * dice_pcm.c - a part of driver for DICE based devices
  *
  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
  * Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp>
  *
  * Licensed under the terms of the GNU General Public License, version 2.
  */

 #include "dice.h"

 static int limit_channels_and_rates(struct snd_dice *dice,
 				    struct snd_pcm_runtime *runtime,
 				    enum amdtp_stream_direction dir,
 				    unsigned int index, unsigned int size)
 {
 	struct snd_pcm_hardware *hw = &runtime->hw;
 	struct amdtp_stream *stream;
 	unsigned int rate;
 	__be32 reg;
 	int err;

 	/*
 	 * Retrieve current Multi Bit Linear Audio data channel and limit to
 	 * it.
 	 */
 	if (dir == AMDTP_IN_STREAM) {
 		stream = &dice->tx_stream[index];
 		err = snd_dice_transaction_read_tx(dice,
 				size * index + TX_NUMBER_AUDIO,
 				&reg, sizeof(reg));
 	} else {
 		stream = &dice->rx_stream[index];
 		err = snd_dice_transaction_read_rx(dice,
 				size * index + RX_NUMBER_AUDIO,
 				&reg, sizeof(reg));
 	}
 	if (err < 0)
 		return err;

 	hw->channels_min = hw->channels_max = be32_to_cpu(reg);

 	/* Retrieve current sampling transfer frequency and limit to it. */
 	err = snd_dice_transaction_get_rate(dice, &rate);
 	if (err < 0)
 		return err;

 	hw->rates = snd_pcm_rate_to_rate_bit(rate);
 	snd_pcm_limit_hw_rates(runtime);

 	return 0;
 }

 static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
 {
 	hw->periods_min = 2;			/* SNDRV_PCM_INFO_BATCH */
 	hw->periods_max = UINT_MAX;

 	hw->period_bytes_min = 4 * hw->channels_max;    /* byte for a frame */

 	/* Just to prevent from allocating much pages. */
 	hw->period_bytes_max = hw->period_bytes_min * 2048;
 	hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
 }

 static int init_hw_info(struct snd_dice *dice,
 			struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_pcm_hardware *hw = &runtime->hw;
 	enum amdtp_stream_direction dir;
 	struct amdtp_stream *stream;
 	__be32 reg[2];
 	unsigned int count, size;
 	int err;

 	hw->info = SNDRV_PCM_INFO_MMAP |
 		   SNDRV_PCM_INFO_MMAP_VALID |
 		   SNDRV_PCM_INFO_BATCH |
 		   SNDRV_PCM_INFO_INTERLEAVED |
 		   SNDRV_PCM_INFO_JOINT_DUPLEX |
 		   SNDRV_PCM_INFO_BLOCK_TRANSFER;

 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 		hw->formats = AM824_IN_PCM_FORMAT_BITS;
 		dir = AMDTP_IN_STREAM;
 		stream = &dice->tx_stream[substream->pcm->device];
 		err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg,
 						   sizeof(reg));
 	} else {
 		hw->formats = AM824_OUT_PCM_FORMAT_BITS;
 		dir = AMDTP_OUT_STREAM;
 		stream = &dice->rx_stream[substream->pcm->device];
 		err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg,
 						   sizeof(reg));
 	}

 	if (err < 0)
 		return err;

 	count = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
 	if (substream->pcm->device >= count)
 		return -ENXIO;

 	size = be32_to_cpu(reg[1]) * 4;
 	err = limit_channels_and_rates(dice, substream->runtime, dir,
 				       substream->pcm->device, size);
 	if (err < 0)
 		return err;
 	limit_period_and_buffer(hw);

 	return amdtp_am824_add_pcm_hw_constraints(stream, runtime);
 }

 static int pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;
 	int err;

 	err = snd_dice_stream_lock_try(dice);
 	if (err < 0)
 		goto end;

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

 	snd_pcm_set_sync(substream);
 end:
 	return err;
 err_locked:
 	snd_dice_stream_lock_release(dice);
 	return err;
 }

 static int pcm_close(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;

 	snd_dice_stream_lock_release(dice);

 	return 0;
 }

 static int capture_hw_params(struct snd_pcm_substream *substream,
 			     struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_dice *dice = substream->private_data;
 	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
 	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(&dice->mutex);
 		dice->substreams_counter++;
 		mutex_unlock(&dice->mutex);
 	}

 	amdtp_am824_set_pcm_format(stream, params_format(hw_params));

 	return 0;
 }
 static int playback_hw_params(struct snd_pcm_substream *substream,
 			      struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_dice *dice = substream->private_data;
 	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
 	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(&dice->mutex);
 		dice->substreams_counter++;
 		mutex_unlock(&dice->mutex);
 	}

 	amdtp_am824_set_pcm_format(stream, params_format(hw_params));

 	return 0;
 }

 static int capture_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;

 	mutex_lock(&dice->mutex);

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

 	snd_dice_stream_stop_duplex(dice);

 	mutex_unlock(&dice->mutex);

 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }

 static int playback_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;

 	mutex_lock(&dice->mutex);

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

 	snd_dice_stream_stop_duplex(dice);

 	mutex_unlock(&dice->mutex);

 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }

 static int capture_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;
 	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
 	int err;

 	mutex_lock(&dice->mutex);
 	err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
 	mutex_unlock(&dice->mutex);
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(stream);

 	return 0;
 }
 static int playback_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;
 	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
 	int err;

 	mutex_lock(&dice->mutex);
 	err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
 	mutex_unlock(&dice->mutex);
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(stream);

 	return err;
 }

 static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_dice *dice = substream->private_data;
 	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];

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

 	return 0;
 }
 static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_dice *dice = substream->private_data;
 	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];

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

 	return 0;
 }

 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;
 	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];

 	return amdtp_stream_pcm_pointer(stream);
 }
 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_dice *dice = substream->private_data;
 	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];

 	return amdtp_stream_pcm_pointer(stream);
 }

 int snd_dice_create_pcm(struct snd_dice *dice)
 {
 	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,
 		.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,
 		.page      = snd_pcm_lib_get_vmalloc_page,
 		.mmap      = snd_pcm_lib_mmap_vmalloc,
 	};
 	__be32 reg;
 	struct snd_pcm *pcm;
 	unsigned int i, max_capture, max_playback, capture, playback;
 	int err;

 	/* Check whether PCM substreams are required. */
 	if (dice->force_two_pcms) {
 		max_capture = max_playback = 2;
 	} else {
 		max_capture = max_playback = 0;
 		err = snd_dice_transaction_read_tx(dice, TX_NUMBER, &reg,
 						   sizeof(reg));
 		if (err < 0)
 			return err;
 		max_capture = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);

 		err = snd_dice_transaction_read_rx(dice, RX_NUMBER, &reg,
 						   sizeof(reg));
 		if (err < 0)
 			return err;
 		max_playback = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
 	}

 	for (i = 0; i < MAX_STREAMS; i++) {
 		capture = playback = 0;
 		if (i < max_capture)
 			capture = 1;
 		if (i < max_playback)
 			playback = 1;
 		if (capture == 0 && playback == 0)
 			break;

 		err = snd_pcm_new(dice->card, "DICE", i, playback, capture,
 				  &pcm);
 		if (err < 0)
 			return err;
 		pcm->private_data = dice;
 		strcpy(pcm->name, dice->card->shortname);

 		if (capture > 0)
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 					&capture_ops);

 		if (playback > 0)
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 					&playback_ops);
 	}

 	return 0;
 }
	/*
	* dice_pcm.c - a part of driver for DICE based devices
	*
	* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
	* Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp>
	*
	* Licensed under the terms of the GNU General Public License, version 2.
	*/

	#include "dice.h"

	static int limit_channels_and_rates(struct snd_dice *dice,
	struct snd_pcm_runtime *runtime,
	enum amdtp_stream_direction dir,
	unsigned int index, unsigned int size)
	{
	struct snd_pcm_hardware *hw = &runtime->hw;
	struct amdtp_stream *stream;
	unsigned int rate;
	__be32 reg;
	int err;

	/*
	* Retrieve current Multi Bit Linear Audio data channel and limit to
	* it.
	*/
	if (dir == AMDTP_IN_STREAM) {
	stream = &dice->tx_stream[index];
	err = snd_dice_transaction_read_tx(dice,
	size * index + TX_NUMBER_AUDIO,
	&reg, sizeof(reg));
	} else {
	stream = &dice->rx_stream[index];
	err = snd_dice_transaction_read_rx(dice,
	size * index + RX_NUMBER_AUDIO,
	&reg, sizeof(reg));
	}
	if (err < 0)
	return err;

	hw->channels_min = hw->channels_max = be32_to_cpu(reg);

	/* Retrieve current sampling transfer frequency and limit to it. */
	err = snd_dice_transaction_get_rate(dice, &rate);
	if (err < 0)
	return err;

	hw->rates = snd_pcm_rate_to_rate_bit(rate);
	snd_pcm_limit_hw_rates(runtime);

	return 0;
	}

	static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
	{
	hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */
	hw->periods_max = UINT_MAX;

	hw->period_bytes_min = 4 * hw->channels_max; /* byte for a frame */

	/* Just to prevent from allocating much pages. */
	hw->period_bytes_max = hw->period_bytes_min * 2048;
	hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
	}

	static int init_hw_info(struct snd_dice *dice,
	struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hardware *hw = &runtime->hw;
	enum amdtp_stream_direction dir;
	struct amdtp_stream *stream;
	__be32 reg[2];
	unsigned int count, size;
	int err;

	hw->info = SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_BATCH \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_JOINT_DUPLEX \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
	hw->formats = AM824_IN_PCM_FORMAT_BITS;
	dir = AMDTP_IN_STREAM;
	stream = &dice->tx_stream[substream->pcm->device];
	err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg,
	sizeof(reg));
	} else {
	hw->formats = AM824_OUT_PCM_FORMAT_BITS;
	dir = AMDTP_OUT_STREAM;
	stream = &dice->rx_stream[substream->pcm->device];
	err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg,
	sizeof(reg));
	}

	if (err < 0)
	return err;

	count = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
	if (substream->pcm->device >= count)
	return -ENXIO;

	size = be32_to_cpu(reg[1]) * 4;
	err = limit_channels_and_rates(dice, substream->runtime, dir,
	substream->pcm->device, size);
	if (err < 0)
	return err;
	limit_period_and_buffer(hw);

	return amdtp_am824_add_pcm_hw_constraints(stream, runtime);
	}

	static int pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_dice *dice = substream->private_data;
	int err;

	err = snd_dice_stream_lock_try(dice);
	if (err < 0)
	goto end;

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

	snd_pcm_set_sync(substream);
	end:
	return err;
	err_locked:
	snd_dice_stream_lock_release(dice);
	return err;
	}

	static int pcm_close(struct snd_pcm_substream *substream)
	{
	struct snd_dice *dice = substream->private_data;

	snd_dice_stream_lock_release(dice);

	return 0;
	}

	static int capture_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct snd_dice *dice = substream->private_data;
	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
	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(&dice->mutex);
	dice->substreams_counter++;
	mutex_unlock(&dice->mutex);
	}

	amdtp_am824_set_pcm_format(stream, params_format(hw_params));

	return 0;
	}
	static int playback_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct snd_dice *dice = substream->private_data;
	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
	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(&dice->mutex);
	dice->substreams_counter++;
	mutex_unlock(&dice->mutex);
	}

	amdtp_am824_set_pcm_format(stream, params_format(hw_params));

	return 0;
	}

	static int capture_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_dice *dice = substream->private_data;

	mutex_lock(&dice->mutex);

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

	snd_dice_stream_stop_duplex(dice);

	mutex_unlock(&dice->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
	}

	static int playback_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_dice *dice = substream->private_data;

	mutex_lock(&dice->mutex);

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

	snd_dice_stream_stop_duplex(dice);

	mutex_unlock(&dice->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
	}

	static int capture_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_dice *dice = substream->private_data;
	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
	int err;

	mutex_lock(&dice->mutex);
	err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
	mutex_unlock(&dice->mutex);
	if (err >= 0)
	amdtp_stream_pcm_prepare(stream);

	return 0;
	}
	static int playback_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_dice *dice = substream->private_data;
	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
	int err;

	mutex_lock(&dice->mutex);
	err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
	mutex_unlock(&dice->mutex);
	if (err >= 0)
	amdtp_stream_pcm_prepare(stream);

	return err;
	}

	static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_dice *dice = substream->private_data;
	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];

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

	return 0;
	}
	static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_dice *dice = substream->private_data;
	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];

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

	return 0;
	}

	static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_dice *dice = substream->private_data;
	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];

	return amdtp_stream_pcm_pointer(stream);
	}
	static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_dice *dice = substream->private_data;
	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];

	return amdtp_stream_pcm_pointer(stream);
	}

	int snd_dice_create_pcm(struct snd_dice *dice)
	{
	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,
	.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,
	.page = snd_pcm_lib_get_vmalloc_page,
	.mmap = snd_pcm_lib_mmap_vmalloc,
	};
	__be32 reg;
	struct snd_pcm *pcm;
	unsigned int i, max_capture, max_playback, capture, playback;
	int err;

	/* Check whether PCM substreams are required. */
	if (dice->force_two_pcms) {
	max_capture = max_playback = 2;
	} else {
	max_capture = max_playback = 0;
	err = snd_dice_transaction_read_tx(dice, TX_NUMBER, &reg,
	sizeof(reg));
	if (err < 0)
	return err;
	max_capture = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);

	err = snd_dice_transaction_read_rx(dice, RX_NUMBER, &reg,
	sizeof(reg));
	if (err < 0)
	return err;
	max_playback = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
	}

	for (i = 0; i < MAX_STREAMS; i++) {
	capture = playback = 0;
	if (i < max_capture)
	capture = 1;
	if (i < max_playback)
	playback = 1;
	if (capture == 0 && playback == 0)
	break;

	err = snd_pcm_new(dice->card, "DICE", i, playback, capture,
	&pcm);
	if (err < 0)
	return err;
	pcm->private_data = dice;
	strcpy(pcm->name, dice->card->shortname);

	if (capture > 0)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
	&capture_ops);

	if (playback > 0)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
	&playback_ops);
	}

	return 0;
	}