sound/firewire/tascam/tascam-pcm.c - kernel/bruno - Git at Google

 /*
  * tascam-pcm.c - a part of driver for TASCAM FireWire series
  *
  * Copyright (c) 2015 Takashi Sakamoto
  *
  * Licensed under the terms of the GNU General Public License, version 2.
  */

 #include "tascam.h"

 static void set_buffer_params(struct snd_pcm_hardware *hw)
 {
 	hw->period_bytes_min = 4 * hw->channels_min;
 	hw->period_bytes_max = hw->period_bytes_min * 2048;
 	hw->buffer_bytes_max = hw->period_bytes_max * 2;

 	hw->periods_min = 2;
 	hw->periods_max = UINT_MAX;
 }

 static int pcm_init_hw_params(struct snd_tscm *tscm,
 			      struct snd_pcm_substream *substream)
 {
 	static const struct snd_pcm_hardware hardware = {
 		.info = SNDRV_PCM_INFO_BATCH |
 			SNDRV_PCM_INFO_BLOCK_TRANSFER |
 			SNDRV_PCM_INFO_INTERLEAVED |
 			SNDRV_PCM_INFO_JOINT_DUPLEX |
 			SNDRV_PCM_INFO_MMAP |
 			SNDRV_PCM_INFO_MMAP_VALID,
 		.rates = SNDRV_PCM_RATE_44100 |
 			 SNDRV_PCM_RATE_48000 |
 			 SNDRV_PCM_RATE_88200 |
 			 SNDRV_PCM_RATE_96000,
 		.rate_min = 44100,
 		.rate_max = 96000,
 		.channels_min = 10,
 		.channels_max = 18,
 	};
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct amdtp_stream *stream;
 	unsigned int pcm_channels;

 	runtime->hw = hardware;

 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
 		stream = &tscm->tx_stream;
 		pcm_channels = tscm->spec->pcm_capture_analog_channels;
 	} else {
 		runtime->hw.formats =
 				SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_S32;
 		stream = &tscm->rx_stream;
 		pcm_channels = tscm->spec->pcm_playback_analog_channels;
 	}

 	if (tscm->spec->has_adat)
 		pcm_channels += 8;
 	if (tscm->spec->has_spdif)
 		pcm_channels += 2;
 	runtime->hw.channels_min = runtime->hw.channels_max = pcm_channels;

 	set_buffer_params(&runtime->hw);

 	return amdtp_tscm_add_pcm_hw_constraints(stream, runtime);
 }

 static int pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_tscm *tscm = substream->private_data;
 	enum snd_tscm_clock clock;
 	unsigned int rate;
 	int err;

 	err = snd_tscm_stream_lock_try(tscm);
 	if (err < 0)
 		goto end;

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

 	err = snd_tscm_stream_get_clock(tscm, &clock);
 	if (clock != SND_TSCM_CLOCK_INTERNAL ||
 	    amdtp_stream_pcm_running(&tscm->rx_stream) ||
 	    amdtp_stream_pcm_running(&tscm->tx_stream)) {
 		err = snd_tscm_stream_get_rate(tscm, &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_tscm_stream_lock_release(tscm);
 	return err;
 }

 static int pcm_close(struct snd_pcm_substream *substream)
 {
 	struct snd_tscm *tscm = substream->private_data;

 	snd_tscm_stream_lock_release(tscm);

 	return 0;
 }

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

 	amdtp_tscm_set_pcm_format(&tscm->tx_stream, params_format(hw_params));

 	return 0;
 }

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

 	amdtp_tscm_set_pcm_format(&tscm->rx_stream, params_format(hw_params));

 	return 0;
 }

 static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_tscm *tscm = substream->private_data;

 	mutex_lock(&tscm->mutex);

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

 	snd_tscm_stream_stop_duplex(tscm);

 	mutex_unlock(&tscm->mutex);

 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }

 static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_tscm *tscm = substream->private_data;

 	mutex_lock(&tscm->mutex);

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

 	snd_tscm_stream_stop_duplex(tscm);

 	mutex_unlock(&tscm->mutex);

 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }

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

 	mutex_lock(&tscm->mutex);

 	err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(&tscm->tx_stream);

 	mutex_unlock(&tscm->mutex);

 	return err;
 }

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

 	mutex_lock(&tscm->mutex);

 	err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(&tscm->rx_stream);

 	mutex_unlock(&tscm->mutex);

 	return err;
 }

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

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

 	return 0;
 }

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

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

 	return 0;
 }

 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 {
 	struct snd_tscm *tscm = sbstrm->private_data;

 	return amdtp_stream_pcm_pointer(&tscm->tx_stream);
 }

 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 {
 	struct snd_tscm *tscm = sbstrm->private_data;

 	return amdtp_stream_pcm_pointer(&tscm->rx_stream);
 }

 static struct snd_pcm_ops pcm_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,
 	.page		= snd_pcm_lib_get_vmalloc_page,
 };

 static struct snd_pcm_ops pcm_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,
 	.page		= snd_pcm_lib_get_vmalloc_page,
 	.mmap		= snd_pcm_lib_mmap_vmalloc,
 };

 int snd_tscm_create_pcm_devices(struct snd_tscm *tscm)
 {
 	struct snd_pcm *pcm;
 	int err;

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

 	pcm->private_data = tscm;
 	snprintf(pcm->name, sizeof(pcm->name),
 		 "%s PCM", tscm->card->shortname);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);

 	return 0;
 }
	/*
	* tascam-pcm.c - a part of driver for TASCAM FireWire series
	*
	* Copyright (c) 2015 Takashi Sakamoto
	*
	* Licensed under the terms of the GNU General Public License, version 2.
	*/

	#include "tascam.h"

	static void set_buffer_params(struct snd_pcm_hardware *hw)
	{
	hw->period_bytes_min = 4 * hw->channels_min;
	hw->period_bytes_max = hw->period_bytes_min * 2048;
	hw->buffer_bytes_max = hw->period_bytes_max * 2;

	hw->periods_min = 2;
	hw->periods_max = UINT_MAX;
	}

	static int pcm_init_hw_params(struct snd_tscm *tscm,
	struct snd_pcm_substream *substream)
	{
	static const struct snd_pcm_hardware hardware = {
	.info = SNDRV_PCM_INFO_BATCH \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_JOINT_DUPLEX \|
	SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID,
	.rates = SNDRV_PCM_RATE_44100 \|
	SNDRV_PCM_RATE_48000 \|
	SNDRV_PCM_RATE_88200 \|
	SNDRV_PCM_RATE_96000,
	.rate_min = 44100,
	.rate_max = 96000,
	.channels_min = 10,
	.channels_max = 18,
	};
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct amdtp_stream *stream;
	unsigned int pcm_channels;

	runtime->hw = hardware;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
	runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
	stream = &tscm->tx_stream;
	pcm_channels = tscm->spec->pcm_capture_analog_channels;
	} else {
	runtime->hw.formats =
	SNDRV_PCM_FMTBIT_S16 \| SNDRV_PCM_FMTBIT_S32;
	stream = &tscm->rx_stream;
	pcm_channels = tscm->spec->pcm_playback_analog_channels;
	}

	if (tscm->spec->has_adat)
	pcm_channels += 8;
	if (tscm->spec->has_spdif)
	pcm_channels += 2;
	runtime->hw.channels_min = runtime->hw.channels_max = pcm_channels;

	set_buffer_params(&runtime->hw);

	return amdtp_tscm_add_pcm_hw_constraints(stream, runtime);
	}

	static int pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_tscm *tscm = substream->private_data;
	enum snd_tscm_clock clock;
	unsigned int rate;
	int err;

	err = snd_tscm_stream_lock_try(tscm);
	if (err < 0)
	goto end;

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

	err = snd_tscm_stream_get_clock(tscm, &clock);
	if (clock != SND_TSCM_CLOCK_INTERNAL \|\|
	amdtp_stream_pcm_running(&tscm->rx_stream) \|\|
	amdtp_stream_pcm_running(&tscm->tx_stream)) {
	err = snd_tscm_stream_get_rate(tscm, &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_tscm_stream_lock_release(tscm);
	return err;
	}

	static int pcm_close(struct snd_pcm_substream *substream)
	{
	struct snd_tscm *tscm = substream->private_data;

	snd_tscm_stream_lock_release(tscm);

	return 0;
	}

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

	amdtp_tscm_set_pcm_format(&tscm->tx_stream, params_format(hw_params));

	return 0;
	}

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

	amdtp_tscm_set_pcm_format(&tscm->rx_stream, params_format(hw_params));

	return 0;
	}

	static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_tscm *tscm = substream->private_data;

	mutex_lock(&tscm->mutex);

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

	snd_tscm_stream_stop_duplex(tscm);

	mutex_unlock(&tscm->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
	}

	static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_tscm *tscm = substream->private_data;

	mutex_lock(&tscm->mutex);

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

	snd_tscm_stream_stop_duplex(tscm);

	mutex_unlock(&tscm->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
	}

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

	mutex_lock(&tscm->mutex);

	err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
	if (err >= 0)
	amdtp_stream_pcm_prepare(&tscm->tx_stream);

	mutex_unlock(&tscm->mutex);

	return err;
	}

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

	mutex_lock(&tscm->mutex);

	err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
	if (err >= 0)
	amdtp_stream_pcm_prepare(&tscm->rx_stream);

	mutex_unlock(&tscm->mutex);

	return err;
	}

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

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

	return 0;
	}

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

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

	return 0;
	}

	static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
	{
	struct snd_tscm *tscm = sbstrm->private_data;

	return amdtp_stream_pcm_pointer(&tscm->tx_stream);
	}

	static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
	{
	struct snd_tscm *tscm = sbstrm->private_data;

	return amdtp_stream_pcm_pointer(&tscm->rx_stream);
	}

	static struct snd_pcm_ops pcm_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,
	.page = snd_pcm_lib_get_vmalloc_page,
	};

	static struct snd_pcm_ops pcm_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,
	.page = snd_pcm_lib_get_vmalloc_page,
	.mmap = snd_pcm_lib_mmap_vmalloc,
	};

	int snd_tscm_create_pcm_devices(struct snd_tscm *tscm)
	{
	struct snd_pcm *pcm;
	int err;

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

	pcm->private_data = tscm;
	snprintf(pcm->name, sizeof(pcm->name),
	"%s PCM", tscm->card->shortname);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);

	return 0;
	}