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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ff-pcm.c - a part of driver for RME Fireface series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto
 */

#include "ff.h"

static int hw_rule_rate(struct snd_pcm_hw_params *params,
			struct snd_pcm_hw_rule *rule)
{
	const unsigned int *pcm_channels = rule->private;
	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 < ARRAY_SIZE(amdtp_rate_table); i++) {
		enum snd_ff_stream_mode mode;
		int err;

		err = snd_ff_stream_get_multiplier_mode(i, &mode);
		if (err < 0)
			continue;

		if (!snd_interval_test(c, pcm_channels[mode]))
			continue;

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

	return snd_interval_refine(r, &t);
}

static int hw_rule_channels(struct snd_pcm_hw_params *params,
			    struct snd_pcm_hw_rule *rule)
{
	const unsigned int *pcm_channels = rule->private;
	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 < ARRAY_SIZE(amdtp_rate_table); i++) {
		enum snd_ff_stream_mode mode;
		int err;

		err = snd_ff_stream_get_multiplier_mode(i, &mode);
		if (err < 0)
			continue;

		if (!snd_interval_test(r, amdtp_rate_table[i]))
			continue;

		t.min = min(t.min, pcm_channels[mode]);
		t.max = max(t.max, pcm_channels[mode]);
	}

	return snd_interval_refine(c, &t);
}

static void limit_channels_and_rates(struct snd_pcm_hardware *hw,
				     const unsigned int *pcm_channels)
{
	unsigned int rate, channels;
	int i;

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

	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
		enum snd_ff_stream_mode mode;
		int err;

		err = snd_ff_stream_get_multiplier_mode(i, &mode);
		if (err < 0)
			continue;

		channels = pcm_channels[mode];
		if (pcm_channels[mode] == 0)
			continue;
		hw->channels_min = min(hw->channels_min, channels);
		hw->channels_max = max(hw->channels_max, channels);

		rate = amdtp_rate_table[i];
		hw->rates |= snd_pcm_rate_to_rate_bit(rate);
		hw->rate_min = min(hw->rate_min, rate);
		hw->rate_max = max(hw->rate_max, rate);
	}
}

static int pcm_init_hw_params(struct snd_ff *ff,
			      struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct amdtp_stream *s;
	const unsigned int *pcm_channels;
	int err;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
		s = &ff->tx_stream;
		pcm_channels = ff->spec->pcm_capture_channels;
	} else {
		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
		s = &ff->rx_stream;
		pcm_channels = ff->spec->pcm_playback_channels;
	}

	limit_channels_and_rates(&runtime->hw, pcm_channels);

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				  hw_rule_channels, (void *)pcm_channels,
				  SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				  hw_rule_rate, (void *)pcm_channels,
				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		return err;

	return amdtp_ff_add_pcm_hw_constraints(s, runtime);
}

static int pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_ff *ff = substream->private_data;
	unsigned int rate;
	enum snd_ff_clock_src src;
	int i, err;

	err = snd_ff_stream_lock_try(ff);
	if (err < 0)
		return err;

	err = pcm_init_hw_params(ff, substream);
	if (err < 0)
		goto release_lock;

	err = ff->spec->protocol->get_clock(ff, &rate, &src);
	if (err < 0)
		goto release_lock;

	if (src != SND_FF_CLOCK_SRC_INTERNAL) {
		for (i = 0; i < CIP_SFC_COUNT; ++i) {
			if (amdtp_rate_table[i] == rate)
				break;
		}
		/*
		 * The unit is configured at sampling frequency which packet
		 * streaming engine can't support.
		 */
		if (i >= CIP_SFC_COUNT) {
			err = -EIO;
			goto release_lock;
		}

		substream->runtime->hw.rate_min = rate;
		substream->runtime->hw.rate_max = rate;
	} else {
		if (amdtp_stream_pcm_running(&ff->rx_stream) ||
		    amdtp_stream_pcm_running(&ff->tx_stream)) {
			rate = amdtp_rate_table[ff->rx_stream.sfc];
			substream->runtime->hw.rate_min = rate;
			substream->runtime->hw.rate_max = rate;
		}
	}

	snd_pcm_set_sync(substream);

	return 0;

release_lock:
	snd_ff_stream_lock_release(ff);
	return err;
}

static int pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_ff *ff = substream->private_data;

	snd_ff_stream_lock_release(ff);

	return 0;
}

static int pcm_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *hw_params)
{
	struct snd_ff *ff = 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) {
		unsigned int rate = params_rate(hw_params);
		unsigned int frames_per_period = params_period_size(hw_params);

		mutex_lock(&ff->mutex);
		err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period);
		if (err >= 0)
			++ff->substreams_counter;
		mutex_unlock(&ff->mutex);
	}

	return 0;
}

static int pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_ff *ff = substream->private_data;

	mutex_lock(&ff->mutex);

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

	snd_ff_stream_stop_duplex(ff);

	mutex_unlock(&ff->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
}

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

	mutex_lock(&ff->mutex);

	err = snd_ff_stream_start_duplex(ff, runtime->rate);
	if (err >= 0)
		amdtp_stream_pcm_prepare(&ff->tx_stream);

	mutex_unlock(&ff->mutex);

	return err;
}

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

	mutex_lock(&ff->mutex);

	err = snd_ff_stream_start_duplex(ff, runtime->rate);
	if (err >= 0)
		amdtp_stream_pcm_prepare(&ff->rx_stream);

	mutex_unlock(&ff->mutex);

	return err;
}

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

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

	return 0;
}

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

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

	return 0;
}

static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
{
	struct snd_ff *ff = sbstrm->private_data;

	return amdtp_stream_pcm_pointer(&ff->tx_stream);
}

static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
{
	struct snd_ff *ff = sbstrm->private_data;

	return amdtp_stream_pcm_pointer(&ff->rx_stream);
}

static int pcm_capture_ack(struct snd_pcm_substream *substream)
{
	struct snd_ff *ff = substream->private_data;

	return amdtp_stream_pcm_ack(&ff->tx_stream);
}

static int pcm_playback_ack(struct snd_pcm_substream *substream)
{
	struct snd_ff *ff = substream->private_data;

	return amdtp_stream_pcm_ack(&ff->rx_stream);
}

int snd_ff_create_pcm_devices(struct snd_ff *ff)
{
	static const struct snd_pcm_ops pcm_capture_ops = {
		.open		= pcm_open,
		.close		= pcm_close,
		.ioctl		= snd_pcm_lib_ioctl,
		.hw_params	= pcm_hw_params,
		.hw_free	= pcm_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 pcm_playback_ops = {
		.open		= pcm_open,
		.close		= pcm_close,
		.ioctl		= snd_pcm_lib_ioctl,
		.hw_params	= pcm_hw_params,
		.hw_free	= pcm_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(ff->card, ff->card->driver, 0, 1, 1, &pcm);
	if (err < 0)
		return err;

	pcm->private_data = ff;
	snprintf(pcm->name, sizeof(pcm->name),
		 "%s PCM", ff->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;
}
Commit	Line	Data
da607e19	1	// SPDX-License-Identifier: GPL-2.0-only
4b316436 TS	2	/*
	3	* ff-pcm.c - a part of driver for RME Fireface series
	4	*
	5	* Copyright (c) 2015-2017 Takashi Sakamoto
4b316436 TS	6	*/
	7
	8	#include "ff.h"
	9
4b316436 TS	10	static int hw_rule_rate(struct snd_pcm_hw_params *params,
	11	struct snd_pcm_hw_rule *rule)
	12	{
	13	const unsigned int *pcm_channels = rule->private;
	14	struct snd_interval *r =
	15	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	16	const struct snd_interval *c =
	17	hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	18	struct snd_interval t = {
	19	.min = UINT_MAX, .max = 0, .integer = 1
	20	};
76ea4688	21	unsigned int i;
4b316436 TS	22
4b316436 TS	23	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
76ea4688 TS	24	enum snd_ff_stream_mode mode;
	25	int err;
	26
	27	err = snd_ff_stream_get_multiplier_mode(i, &mode);
	28	if (err < 0)
	29	continue;
	30
4b316436 TS	31	if (!snd_interval_test(c, pcm_channels[mode]))
	32	continue;
	33
	34	t.min = min(t.min, amdtp_rate_table[i]);
	35	t.max = max(t.max, amdtp_rate_table[i]);
	36	}
	37
	38	return snd_interval_refine(r, &t);
	39	}
	40
	41	static int hw_rule_channels(struct snd_pcm_hw_params *params,
	42	struct snd_pcm_hw_rule *rule)
	43	{
	44	const unsigned int *pcm_channels = rule->private;
	45	struct snd_interval *c =
	46	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	47	const struct snd_interval *r =
	48	hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	49	struct snd_interval t = {
	50	.min = UINT_MAX, .max = 0, .integer = 1
	51	};
76ea4688	52	unsigned int i;
4b316436 TS	53
4b316436 TS	54	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
76ea4688 TS	55	enum snd_ff_stream_mode mode;
	56	int err;
	57
	58	err = snd_ff_stream_get_multiplier_mode(i, &mode);
	59	if (err < 0)
	60	continue;
	61
4b316436 TS	62	if (!snd_interval_test(r, amdtp_rate_table[i]))
	63	continue;
	64
	65	t.min = min(t.min, pcm_channels[mode]);
	66	t.max = max(t.max, pcm_channels[mode]);
	67	}
	68
	69	return snd_interval_refine(c, &t);
	70	}
	71
	72	static void limit_channels_and_rates(struct snd_pcm_hardware *hw,
	73	const unsigned int *pcm_channels)
	74	{
4b316436 TS	75	unsigned int rate, channels;
	76	int i;
	77
	78	hw->channels_min = UINT_MAX;
	79	hw->channels_max = 0;
	80	hw->rate_min = UINT_MAX;
	81	hw->rate_max = 0;
	82
	83	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
76ea4688 TS	84	enum snd_ff_stream_mode mode;
	85	int err;
	86
	87	err = snd_ff_stream_get_multiplier_mode(i, &mode);
	88	if (err < 0)
	89	continue;
4b316436 TS	90
	91	channels = pcm_channels[mode];
	92	if (pcm_channels[mode] == 0)
	93	continue;
	94	hw->channels_min = min(hw->channels_min, channels);
	95	hw->channels_max = max(hw->channels_max, channels);
	96
	97	rate = amdtp_rate_table[i];
	98	hw->rates \|= snd_pcm_rate_to_rate_bit(rate);
	99	hw->rate_min = min(hw->rate_min, rate);
	100	hw->rate_max = max(hw->rate_max, rate);
	101	}
	102	}
	103
4b316436 TS	104	static int pcm_init_hw_params(struct snd_ff *ff,
	105	struct snd_pcm_substream *substream)
	106	{
	107	struct snd_pcm_runtime *runtime = substream->runtime;
	108	struct amdtp_stream *s;
	109	const unsigned int *pcm_channels;
	110	int err;
	111
4b316436 TS	112	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
	113	runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
	114	s = &ff->tx_stream;
	115	pcm_channels = ff->spec->pcm_capture_channels;
	116	} else {
	117	runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
	118	s = &ff->rx_stream;
	119	pcm_channels = ff->spec->pcm_playback_channels;
	120	}
	121
4b316436	122	limit_channels_and_rates(&runtime->hw, pcm_channels);
4b316436 TS	123
	124	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
	125	hw_rule_channels, (void *)pcm_channels,
	126	SNDRV_PCM_HW_PARAM_RATE, -1);
	127	if (err < 0)
	128	return err;
	129
	130	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
	131	hw_rule_rate, (void *)pcm_channels,
	132	SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	133	if (err < 0)
	134	return err;
	135
	136	return amdtp_ff_add_pcm_hw_constraints(s, runtime);
	137	}
	138
	139	static int pcm_open(struct snd_pcm_substream *substream)
	140	{
	141	struct snd_ff *ff = substream->private_data;
	142	unsigned int rate;
	143	enum snd_ff_clock_src src;
	144	int i, err;
	145
f656edd5	146	err = snd_ff_stream_lock_try(ff);
4b316436 TS	147	if (err < 0)
	148	return err;
	149
f656edd5	150	err = pcm_init_hw_params(ff, substream);
af43173c ME	151	if (err < 0)
af43173c ME	152	goto release_lock;
f656edd5	153
b1d0cb0a	154	err = ff->spec->protocol->get_clock(ff, &rate, &src);
af43173c ME	155	if (err < 0)
af43173c ME	156	goto release_lock;
4b316436 TS	157
	158	if (src != SND_FF_CLOCK_SRC_INTERNAL) {
	159	for (i = 0; i < CIP_SFC_COUNT; ++i) {
	160	if (amdtp_rate_table[i] == rate)
	161	break;
	162	}
	163	/*
	164	* The unit is configured at sampling frequency which packet
	165	* streaming engine can't support.
	166	*/
f656edd5	167	if (i >= CIP_SFC_COUNT) {
af43173c ME	168	err = -EIO;
af43173c ME	169	goto release_lock;
f656edd5	170	}
4b316436 TS	171
	172	substream->runtime->hw.rate_min = rate;
	173	substream->runtime->hw.rate_max = rate;
	174	} else {
	175	if (amdtp_stream_pcm_running(&ff->rx_stream) \|\|
	176	amdtp_stream_pcm_running(&ff->tx_stream)) {
	177	rate = amdtp_rate_table[ff->rx_stream.sfc];
	178	substream->runtime->hw.rate_min = rate;
	179	substream->runtime->hw.rate_max = rate;
	180	}
	181	}
	182
	183	snd_pcm_set_sync(substream);
	184
	185	return 0;
af43173c ME	186
	187	release_lock:
	188	snd_ff_stream_lock_release(ff);
	189	return err;
4b316436 TS	190	}
	191
	192	static int pcm_close(struct snd_pcm_substream *substream)
	193	{
f656edd5 TS	194	struct snd_ff *ff = substream->private_data;
	195
	196	snd_ff_stream_lock_release(ff);
	197
4b316436 TS	198	return 0;
	199	}
	200
49f621fe TS	201	static int pcm_hw_params(struct snd_pcm_substream *substream,
49f621fe TS	202	struct snd_pcm_hw_params *hw_params)
4b316436 TS	203	{
	204	struct snd_ff *ff = substream->private_data;
	205	int err;
	206
	207	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	208	params_buffer_bytes(hw_params));
	209	if (err < 0)
	210	return err;
	211
	212	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
55162d2b	213	unsigned int rate = params_rate(hw_params);
9d9ff58c	214	unsigned int frames_per_period = params_period_size(hw_params);
55162d2b	215
4b316436	216	mutex_lock(&ff->mutex);
9d9ff58c	217	err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period);
55162d2b TS	218	if (err >= 0)
55162d2b TS	219	++ff->substreams_counter;
4b316436 TS	220	mutex_unlock(&ff->mutex);
	221	}
	222
	223	return 0;
	224	}
	225
49f621fe	226	static int pcm_hw_free(struct snd_pcm_substream *substream)
4b316436 TS	227	{
	228	struct snd_ff *ff = substream->private_data;
	229
	230	mutex_lock(&ff->mutex);
	231
	232	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
55162d2b	233	--ff->substreams_counter;
4b316436 TS	234
	235	snd_ff_stream_stop_duplex(ff);
	236
	237	mutex_unlock(&ff->mutex);
	238
	239	return snd_pcm_lib_free_vmalloc_buffer(substream);
	240	}
	241
	242	static int pcm_capture_prepare(struct snd_pcm_substream *substream)
	243	{
	244	struct snd_ff *ff = substream->private_data;
	245	struct snd_pcm_runtime *runtime = substream->runtime;
	246	int err;
	247
	248	mutex_lock(&ff->mutex);
	249
	250	err = snd_ff_stream_start_duplex(ff, runtime->rate);
	251	if (err >= 0)
	252	amdtp_stream_pcm_prepare(&ff->tx_stream);
	253
	254	mutex_unlock(&ff->mutex);
	255
	256	return err;
	257	}
	258
	259	static int pcm_playback_prepare(struct snd_pcm_substream *substream)
	260	{
	261	struct snd_ff *ff = substream->private_data;
	262	struct snd_pcm_runtime *runtime = substream->runtime;
	263	int err;
	264
	265	mutex_lock(&ff->mutex);
	266
	267	err = snd_ff_stream_start_duplex(ff, runtime->rate);
	268	if (err >= 0)
	269	amdtp_stream_pcm_prepare(&ff->rx_stream);
	270
	271	mutex_unlock(&ff->mutex);
	272
	273	return err;
	274	}
	275
	276	static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
	277	{
	278	struct snd_ff *ff = substream->private_data;
	279
	280	switch (cmd) {
	281	case SNDRV_PCM_TRIGGER_START:
	282	amdtp_stream_pcm_trigger(&ff->tx_stream, substream);
	283	break;
	284	case SNDRV_PCM_TRIGGER_STOP:
	285	amdtp_stream_pcm_trigger(&ff->tx_stream, NULL);
	286	break;
	287	default:
	288	return -EINVAL;
	289	}
	290
	291	return 0;
	292	}
	293
	294	static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
	295	{
	296	struct snd_ff *ff = substream->private_data;
	297
298	switch (cmd) {
299	case SNDRV_PCM_TRIGGER_START:
300	amdtp_stream_pcm_trigger(&ff->rx_stream, substream);
301	break;
302	case SNDRV_PCM_TRIGGER_STOP:
303	amdtp_stream_pcm_trigger(&ff->rx_stream, NULL);
304	break;
305	default:
306	return -EINVAL;
307	}
308
309	return 0;
310	}
311
312	static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
313	{
314	struct snd_ff *ff = sbstrm->private_data;
315
316	return amdtp_stream_pcm_pointer(&ff->tx_stream);
317	}
318
319	static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
320	{
321	struct snd_ff *ff = sbstrm->private_data;
322
323	return amdtp_stream_pcm_pointer(&ff->rx_stream);
324	}
325
875becf8 TS	326	static int pcm_capture_ack(struct snd_pcm_substream *substream)
	327	{
	328	struct snd_ff *ff = substream->private_data;
	329
	330	return amdtp_stream_pcm_ack(&ff->tx_stream);
	331	}
	332
	333	static int pcm_playback_ack(struct snd_pcm_substream *substream)
	334	{
	335	struct snd_ff *ff = substream->private_data;
	336
	337	return amdtp_stream_pcm_ack(&ff->rx_stream);
	338	}
	339
4b316436 TS	340	int snd_ff_create_pcm_devices(struct snd_ff *ff)
4b316436 TS	341	{
d2dc2a96 TS	342	static const struct snd_pcm_ops pcm_capture_ops = {
	343	.open = pcm_open,
	344	.close = pcm_close,
	345	.ioctl = snd_pcm_lib_ioctl,
49f621fe TS	346	.hw_params = pcm_hw_params,
49f621fe TS	347	.hw_free = pcm_hw_free,
d2dc2a96 TS	348	.prepare = pcm_capture_prepare,
	349	.trigger = pcm_capture_trigger,
	350	.pointer = pcm_capture_pointer,
	351	.ack = pcm_capture_ack,
	352	.page = snd_pcm_lib_get_vmalloc_page,
	353	};
	354	static const struct snd_pcm_ops pcm_playback_ops = {
	355	.open = pcm_open,
	356	.close = pcm_close,
	357	.ioctl = snd_pcm_lib_ioctl,
49f621fe TS	358	.hw_params = pcm_hw_params,
49f621fe TS	359	.hw_free = pcm_hw_free,
d2dc2a96 TS	360	.prepare = pcm_playback_prepare,
	361	.trigger = pcm_playback_trigger,
	362	.pointer = pcm_playback_pointer,
	363	.ack = pcm_playback_ack,
	364	.page = snd_pcm_lib_get_vmalloc_page,
d2dc2a96	365	};
4b316436 TS	366	struct snd_pcm *pcm;
	367	int err;
	368
	369	err = snd_pcm_new(ff->card, ff->card->driver, 0, 1, 1, &pcm);
	370	if (err < 0)
	371	return err;
	372
	373	pcm->private_data = ff;
	374	snprintf(pcm->name, sizeof(pcm->name),
	375	"%s PCM", ff->card->shortname);
	376	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
	377	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
	378
	379	return 0;
	380	}