[linux-2.6-block.git] / sound / firewire / dice / dice-pcm.c

/*
 * 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;
	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);
	}

	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;
	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);
	}

	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;
}
Commit	Line	Data
c50fb91f TS	1	/*
	2	* dice_pcm.c - a part of driver for DICE based devices
	3	*
	4	* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
	5	* Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp>
	6	*
	7	* Licensed under the terms of the GNU General Public License, version 2.
	8	*/
	9
	10	#include "dice.h"
	11
0d5ee195 TS	12	static int limit_channels_and_rates(struct snd_dice *dice,
0d5ee195 TS	13	struct snd_pcm_runtime *runtime,
4bdc495c TS	14	enum amdtp_stream_direction dir,
4bdc495c TS	15	unsigned int index, unsigned int size)
c50fb91f	16	{
2c2416c8	17	struct snd_pcm_hardware *hw = &runtime->hw;
4bdc495c	18	struct amdtp_stream *stream;
0d5ee195	19	unsigned int rate;
4bdc495c	20	__be32 reg;
0d5ee195	21	int err;
c50fb91f	22
0d5ee195 TS	23	/*
	24	* Retrieve current Multi Bit Linear Audio data channel and limit to
	25	* it.
	26	*/
4bdc495c TS	27	if (dir == AMDTP_IN_STREAM) {
	28	stream = &dice->tx_stream[index];
	29	err = snd_dice_transaction_read_tx(dice,
	30	size * index + TX_NUMBER_AUDIO,
	31	&reg, sizeof(reg));
0d5ee195	32	} else {
4bdc495c TS	33	stream = &dice->rx_stream[index];
	34	err = snd_dice_transaction_read_rx(dice,
	35	size * index + RX_NUMBER_AUDIO,
	36	&reg, sizeof(reg));
0d5ee195 TS	37	}
	38	if (err < 0)
	39	return err;
c50fb91f	40
4bdc495c	41	hw->channels_min = hw->channels_max = be32_to_cpu(reg);
2c2416c8	42
0d5ee195 TS	43	/* Retrieve current sampling transfer frequency and limit to it. */
	44	err = snd_dice_transaction_get_rate(dice, &rate);
	45	if (err < 0)
	46	return err;
2c2416c8	47
0d5ee195	48	hw->rates = snd_pcm_rate_to_rate_bit(rate);
c50fb91f	49	snd_pcm_limit_hw_rates(runtime);
0d5ee195 TS	50
0d5ee195 TS	51	return 0;
2c2416c8	52	}
c50fb91f	53
2c2416c8 TS	54	static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
	55	{
	56	hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */
	57	hw->periods_max = UINT_MAX;
	58
	59	hw->period_bytes_min = 4 * hw->channels_max; /* byte for a frame */
	60
	61	/* Just to prevent from allocating much pages. */
	62	hw->period_bytes_max = hw->period_bytes_min * 2048;
	63	hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
	64	}
	65
	66	static int init_hw_info(struct snd_dice *dice,
	67	struct snd_pcm_substream *substream)
	68	{
	69	struct snd_pcm_runtime *runtime = substream->runtime;
	70	struct snd_pcm_hardware *hw = &runtime->hw;
4bdc495c	71	enum amdtp_stream_direction dir;
69dcf3e4	72	struct amdtp_stream *stream;
4bdc495c TS	73	__be32 reg[2];
4bdc495c TS	74	unsigned int count, size;
2c2416c8 TS	75	int err;
	76
	77	hw->info = SNDRV_PCM_INFO_MMAP \|
	78	SNDRV_PCM_INFO_MMAP_VALID \|
	79	SNDRV_PCM_INFO_BATCH \|
	80	SNDRV_PCM_INFO_INTERLEAVED \|
69dcf3e4	81	SNDRV_PCM_INFO_JOINT_DUPLEX \|
2c2416c8	82	SNDRV_PCM_INFO_BLOCK_TRANSFER;
2c2416c8	83
69dcf3e4	84	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
49c7b3fc	85	hw->formats = AM824_IN_PCM_FORMAT_BITS;
4bdc495c TS	86	dir = AMDTP_IN_STREAM;
	87	stream = &dice->tx_stream[substream->pcm->device];
	88	err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg,
	89	sizeof(reg));
69dcf3e4	90	} else {
49c7b3fc	91	hw->formats = AM824_OUT_PCM_FORMAT_BITS;
4bdc495c TS	92	dir = AMDTP_OUT_STREAM;
	93	stream = &dice->rx_stream[substream->pcm->device];
	94	err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg,
	95	sizeof(reg));
69dcf3e4 TS	96	}
69dcf3e4 TS	97
4bdc495c TS	98	if (err < 0)
	99	return err;
	100
	101	count = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
	102	if (substream->pcm->device >= count)
	103	return -ENXIO;
	104
	105	size = be32_to_cpu(reg[1]) * 4;
	106	err = limit_channels_and_rates(dice, substream->runtime, dir,
	107	substream->pcm->device, size);
c50fb91f	108	if (err < 0)
0d5ee195 TS	109	return err;
0d5ee195 TS	110	limit_period_and_buffer(hw);
c50fb91f	111
0d5ee195	112	return amdtp_am824_add_pcm_hw_constraints(stream, runtime);
2c2416c8	113	}
c50fb91f	114
2c2416c8 TS	115	static int pcm_open(struct snd_pcm_substream *substream)
	116	{
	117	struct snd_dice *dice = substream->private_data;
	118	int err;
c50fb91f	119
2c2416c8 TS	120	err = snd_dice_stream_lock_try(dice);
	121	if (err < 0)
	122	goto end;
	123
	124	err = init_hw_info(dice, substream);
	125	if (err < 0)
	126	goto err_locked;
8fc01fc0	127
8fc01fc0	128	snd_pcm_set_sync(substream);
2c2416c8 TS	129	end:
	130	return err;
	131	err_locked:
c50fb91f	132	snd_dice_stream_lock_release(dice);
c50fb91f TS	133	return err;
	134	}
	135
	136	static int pcm_close(struct snd_pcm_substream *substream)
	137	{
	138	struct snd_dice *dice = substream->private_data;
	139
	140	snd_dice_stream_lock_release(dice);
	141
	142	return 0;
	143	}
	144
69dcf3e4 TS	145	static int capture_hw_params(struct snd_pcm_substream *substream,
	146	struct snd_pcm_hw_params *hw_params)
	147	{
	148	struct snd_dice *dice = substream->private_data;
22c103cd TS	149	int err;
	150
	151	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	152	params_buffer_bytes(hw_params));
	153	if (err < 0)
	154	return err;
69dcf3e4 TS	155
	156	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
	157	mutex_lock(&dice->mutex);
	158	dice->substreams_counter++;
	159	mutex_unlock(&dice->mutex);
	160	}
	161
22c103cd	162	return 0;
69dcf3e4	163	}
c50fb91f TS	164	static int playback_hw_params(struct snd_pcm_substream *substream,
	165	struct snd_pcm_hw_params *hw_params)
	166	{
	167	struct snd_dice *dice = substream->private_data;
22c103cd TS	168	int err;
	169
	170	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	171	params_buffer_bytes(hw_params));
	172	if (err < 0)
	173	return err;
69dcf3e4 TS	174
	175	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
	176	mutex_lock(&dice->mutex);
	177	dice->substreams_counter++;
	178	mutex_unlock(&dice->mutex);
	179	}
	180
22c103cd	181	return 0;
c50fb91f TS	182	}
c50fb91f TS	183
69dcf3e4 TS	184	static int capture_hw_free(struct snd_pcm_substream *substream)
	185	{
	186	struct snd_dice *dice = substream->private_data;
	187
	188	mutex_lock(&dice->mutex);
	189
	190	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
	191	dice->substreams_counter--;
	192
	193	snd_dice_stream_stop_duplex(dice);
	194
	195	mutex_unlock(&dice->mutex);
	196
	197	return snd_pcm_lib_free_vmalloc_buffer(substream);
	198	}
	199
c50fb91f TS	200	static int playback_hw_free(struct snd_pcm_substream *substream)
	201	{
	202	struct snd_dice *dice = substream->private_data;
	203
	204	mutex_lock(&dice->mutex);
69dcf3e4 TS	205
	206	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
	207	dice->substreams_counter--;
	208
9a02843c	209	snd_dice_stream_stop_duplex(dice);
69dcf3e4	210
c50fb91f TS	211	mutex_unlock(&dice->mutex);
	212
	213	return snd_pcm_lib_free_vmalloc_buffer(substream);
	214	}
	215
69dcf3e4 TS	216	static int capture_prepare(struct snd_pcm_substream *substream)
	217	{
	218	struct snd_dice *dice = substream->private_data;
4bdc495c	219	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
69dcf3e4 TS	220	int err;
	221
	222	mutex_lock(&dice->mutex);
	223	err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
	224	mutex_unlock(&dice->mutex);
	225	if (err >= 0)
8ae25b76	226	amdtp_stream_pcm_prepare(stream);
69dcf3e4 TS	227
	228	return 0;
	229	}
c50fb91f TS	230	static int playback_prepare(struct snd_pcm_substream *substream)
	231	{
	232	struct snd_dice *dice = substream->private_data;
4bdc495c	233	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
c50fb91f TS	234	int err;
	235
	236	mutex_lock(&dice->mutex);
9a02843c	237	err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
c50fb91f	238	mutex_unlock(&dice->mutex);
288a8d0c	239	if (err >= 0)
8ae25b76	240	amdtp_stream_pcm_prepare(stream);
c50fb91f	241
288a8d0c	242	return err;
c50fb91f TS	243	}
c50fb91f TS	244
69dcf3e4 TS	245	static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
	246	{
	247	struct snd_dice *dice = substream->private_data;
4bdc495c	248	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
69dcf3e4 TS	249
	250	switch (cmd) {
	251	case SNDRV_PCM_TRIGGER_START:
8ae25b76	252	amdtp_stream_pcm_trigger(stream, substream);
69dcf3e4 TS	253	break;
69dcf3e4 TS	254	case SNDRV_PCM_TRIGGER_STOP:
8ae25b76	255	amdtp_stream_pcm_trigger(stream, NULL);
69dcf3e4 TS	256	break;
	257	default:
	258	return -EINVAL;
	259	}
	260
	261	return 0;
	262	}
c50fb91f TS	263	static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
	264	{
	265	struct snd_dice *dice = substream->private_data;
4bdc495c	266	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
c50fb91f TS	267
	268	switch (cmd) {
	269	case SNDRV_PCM_TRIGGER_START:
8ae25b76	270	amdtp_stream_pcm_trigger(stream, substream);
c50fb91f TS	271	break;
c50fb91f TS	272	case SNDRV_PCM_TRIGGER_STOP:
8ae25b76	273	amdtp_stream_pcm_trigger(stream, NULL);
c50fb91f TS	274	break;
	275	default:
	276	return -EINVAL;
	277	}
	278
	279	return 0;
	280	}
	281
69dcf3e4 TS	282	static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
	283	{
	284	struct snd_dice *dice = substream->private_data;
4bdc495c	285	struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
69dcf3e4	286
8ae25b76	287	return amdtp_stream_pcm_pointer(stream);
69dcf3e4	288	}
c50fb91f TS	289	static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
	290	{
	291	struct snd_dice *dice = substream->private_data;
4bdc495c	292	struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
c50fb91f	293
8ae25b76	294	return amdtp_stream_pcm_pointer(stream);
c50fb91f TS	295	}
	296
	297	int snd_dice_create_pcm(struct snd_dice *dice)
	298	{
5116ffc3	299	static const struct snd_pcm_ops capture_ops = {
69dcf3e4 TS	300	.open = pcm_open,
	301	.close = pcm_close,
	302	.ioctl = snd_pcm_lib_ioctl,
	303	.hw_params = capture_hw_params,
	304	.hw_free = capture_hw_free,
	305	.prepare = capture_prepare,
	306	.trigger = capture_trigger,
	307	.pointer = capture_pointer,
	308	.page = snd_pcm_lib_get_vmalloc_page,
	309	.mmap = snd_pcm_lib_mmap_vmalloc,
	310	};
5116ffc3	311	static const struct snd_pcm_ops playback_ops = {
c50fb91f TS	312	.open = pcm_open,
	313	.close = pcm_close,
	314	.ioctl = snd_pcm_lib_ioctl,
	315	.hw_params = playback_hw_params,
	316	.hw_free = playback_hw_free,
	317	.prepare = playback_prepare,
	318	.trigger = playback_trigger,
	319	.pointer = playback_pointer,
	320	.page = snd_pcm_lib_get_vmalloc_page,
	321	.mmap = snd_pcm_lib_mmap_vmalloc,
	322	};
c3007656	323	__be32 reg;
c50fb91f	324	struct snd_pcm *pcm;
4bdc495c	325	unsigned int i, max_capture, max_playback, capture, playback;
c50fb91f TS	326	int err;
c50fb91f TS	327
4bdc495c	328	/* Check whether PCM substreams are required. */
7cafc65b TS	329	if (dice->force_two_pcms) {
	330	max_capture = max_playback = 2;
	331	} else {
	332	max_capture = max_playback = 0;
	333	err = snd_dice_transaction_read_tx(dice, TX_NUMBER, &reg,
	334	sizeof(reg));
	335	if (err < 0)
	336	return err;
	337	max_capture = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
69dcf3e4	338
7cafc65b TS	339	err = snd_dice_transaction_read_rx(dice, RX_NUMBER, &reg,
	340	sizeof(reg));
	341	if (err < 0)
	342	return err;
	343	max_playback = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
	344	}
4bdc495c TS	345
	346	for (i = 0; i < MAX_STREAMS; i++) {
	347	capture = playback = 0;
	348	if (i < max_capture)
	349	capture = 1;
	350	if (i < max_playback)
	351	playback = 1;
	352	if (capture == 0 && playback == 0)
	353	break;
	354
	355	err = snd_pcm_new(dice->card, "DICE", i, playback, capture,
	356	&pcm);
	357	if (err < 0)
	358	return err;
	359	pcm->private_data = dice;
	360	strcpy(pcm->name, dice->card->shortname);
	361
	362	if (capture > 0)
	363	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
	364	&capture_ops);
	365
	366	if (playback > 0)
	367	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
	368	&playback_ops);
	369	}
c50fb91f TS	370
	371	return 0;
	372	}