[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;
	struct amdtp_domain *d = &ff->domain;
	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;

	mutex_lock(&ff->mutex);

	// When source of clock is not internal or any stream is reserved for
	// transmission of PCM frames, the available sampling rate is limited
	// at current one.
	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) {
			mutex_unlock(&ff->mutex);
			err = -EIO;
			goto release_lock;
		}

		substream->runtime->hw.rate_min = rate;
		substream->runtime->hw.rate_max = rate;
	} else {
		if (ff->substreams_counter > 0) {
			unsigned int frames_per_period = d->events_per_period;

			rate = amdtp_rate_table[ff->rx_stream.sfc];
			substream->runtime->hw.rate_min = rate;
			substream->runtime->hw.rate_max = rate;

			err = snd_pcm_hw_constraint_minmax(substream->runtime,
					SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
					frames_per_period, frames_per_period);
			if (err < 0) {
				mutex_unlock(&ff->mutex);
				goto release_lock;
			}
		}
	}

	mutex_unlock(&ff->mutex);

	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;
3aac3263	142	struct amdtp_domain *d = &ff->domain;
4b316436 TS	143	unsigned int rate;
	144	enum snd_ff_clock_src src;
	145	int i, err;
	146
f656edd5	147	err = snd_ff_stream_lock_try(ff);
4b316436 TS	148	if (err < 0)
	149	return err;
	150
f656edd5	151	err = pcm_init_hw_params(ff, substream);
af43173c ME	152	if (err < 0)
af43173c ME	153	goto release_lock;
f656edd5	154
b1d0cb0a	155	err = ff->spec->protocol->get_clock(ff, &rate, &src);
af43173c ME	156	if (err < 0)
af43173c ME	157	goto release_lock;
4b316436	158
3aac3263 TS	159	mutex_lock(&ff->mutex);
	160
	161	// When source of clock is not internal or any stream is reserved for
	162	// transmission of PCM frames, the available sampling rate is limited
	163	// at current one.
4b316436 TS	164	if (src != SND_FF_CLOCK_SRC_INTERNAL) {
	165	for (i = 0; i < CIP_SFC_COUNT; ++i) {
	166	if (amdtp_rate_table[i] == rate)
	167	break;
	168	}
3aac3263 TS	169
	170	// The unit is configured at sampling frequency which packet
	171	// streaming engine can't support.
f656edd5	172	if (i >= CIP_SFC_COUNT) {
3aac3263	173	mutex_unlock(&ff->mutex);
af43173c ME	174	err = -EIO;
af43173c ME	175	goto release_lock;
f656edd5	176	}
4b316436 TS	177
	178	substream->runtime->hw.rate_min = rate;
	179	substream->runtime->hw.rate_max = rate;
	180	} else {
3aac3263 TS	181	if (ff->substreams_counter > 0) {
	182	unsigned int frames_per_period = d->events_per_period;
	183
4b316436 TS	184	rate = amdtp_rate_table[ff->rx_stream.sfc];
	185	substream->runtime->hw.rate_min = rate;
	186	substream->runtime->hw.rate_max = rate;
3aac3263 TS	187
	188	err = snd_pcm_hw_constraint_minmax(substream->runtime,
	189	SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
	190	frames_per_period, frames_per_period);
	191	if (err < 0) {
	192	mutex_unlock(&ff->mutex);
	193	goto release_lock;
	194	}
4b316436 TS	195	}
	196	}
	197
3aac3263 TS	198	mutex_unlock(&ff->mutex);
3aac3263 TS	199
4b316436 TS	200	snd_pcm_set_sync(substream);
	201
	202	return 0;
af43173c ME	203
	204	release_lock:
	205	snd_ff_stream_lock_release(ff);
	206	return err;
4b316436 TS	207	}
	208
	209	static int pcm_close(struct snd_pcm_substream *substream)
	210	{
f656edd5 TS	211	struct snd_ff *ff = substream->private_data;
	212
	213	snd_ff_stream_lock_release(ff);
	214
4b316436 TS	215	return 0;
	216	}
	217
49f621fe TS	218	static int pcm_hw_params(struct snd_pcm_substream *substream,
49f621fe TS	219	struct snd_pcm_hw_params *hw_params)
4b316436 TS	220	{
	221	struct snd_ff *ff = substream->private_data;
	222	int err;
	223
	224	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	225	params_buffer_bytes(hw_params));
	226	if (err < 0)
	227	return err;
	228
	229	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
55162d2b	230	unsigned int rate = params_rate(hw_params);
9d9ff58c	231	unsigned int frames_per_period = params_period_size(hw_params);
55162d2b	232
4b316436	233	mutex_lock(&ff->mutex);
9d9ff58c	234	err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period);
55162d2b TS	235	if (err >= 0)
55162d2b TS	236	++ff->substreams_counter;
4b316436 TS	237	mutex_unlock(&ff->mutex);
	238	}
	239
	240	return 0;
	241	}
	242
49f621fe	243	static int pcm_hw_free(struct snd_pcm_substream *substream)
4b316436 TS	244	{
	245	struct snd_ff *ff = substream->private_data;
	246
	247	mutex_lock(&ff->mutex);
	248
	249	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
55162d2b	250	--ff->substreams_counter;
4b316436 TS	251
	252	snd_ff_stream_stop_duplex(ff);
	253
	254	mutex_unlock(&ff->mutex);
	255
	256	return snd_pcm_lib_free_vmalloc_buffer(substream);
	257	}
	258
	259	static int pcm_capture_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->tx_stream);
	270
	271	mutex_unlock(&ff->mutex);
	272
	273	return err;
	274	}
	275
	276	static int pcm_playback_prepare(struct snd_pcm_substream *substream)
	277	{
	278	struct snd_ff *ff = substream->private_data;
	279	struct snd_pcm_runtime *runtime = substream->runtime;
	280	int err;
	281
	282	mutex_lock(&ff->mutex);
	283
	284	err = snd_ff_stream_start_duplex(ff, runtime->rate);
	285	if (err >= 0)
	286	amdtp_stream_pcm_prepare(&ff->rx_stream);
	287
	288	mutex_unlock(&ff->mutex);
	289
	290	return err;
	291	}
	292
	293	static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
	294	{
	295	struct snd_ff *ff = substream->private_data;
	296
	297	switch (cmd) {
	298	case SNDRV_PCM_TRIGGER_START:
	299	amdtp_stream_pcm_trigger(&ff->tx_stream, substream);
	300	break;
	301	case SNDRV_PCM_TRIGGER_STOP:
	302	amdtp_stream_pcm_trigger(&ff->tx_stream, NULL);
	303	break;
	304	default:
	305	return -EINVAL;
	306	}
	307
	308	return 0;
	309	}
	310
	311	static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
	312	{
	313	struct snd_ff *ff = substream->private_data;
	314
315	switch (cmd) {
316	case SNDRV_PCM_TRIGGER_START:
317	amdtp_stream_pcm_trigger(&ff->rx_stream, substream);
318	break;
319	case SNDRV_PCM_TRIGGER_STOP:
320	amdtp_stream_pcm_trigger(&ff->rx_stream, NULL);
321	break;
322	default:
323	return -EINVAL;
324	}
325
326	return 0;
327	}
328
329	static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
330	{
331	struct snd_ff *ff = sbstrm->private_data;
332
333	return amdtp_stream_pcm_pointer(&ff->tx_stream);
334	}
335
336	static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
337	{
338	struct snd_ff *ff = sbstrm->private_data;
339
340	return amdtp_stream_pcm_pointer(&ff->rx_stream);
341	}
342
875becf8 TS	343	static int pcm_capture_ack(struct snd_pcm_substream *substream)
	344	{
	345	struct snd_ff *ff = substream->private_data;
	346
	347	return amdtp_stream_pcm_ack(&ff->tx_stream);
	348	}
	349
	350	static int pcm_playback_ack(struct snd_pcm_substream *substream)
	351	{
	352	struct snd_ff *ff = substream->private_data;
	353
	354	return amdtp_stream_pcm_ack(&ff->rx_stream);
	355	}
	356
4b316436 TS	357	int snd_ff_create_pcm_devices(struct snd_ff *ff)
4b316436 TS	358	{
d2dc2a96 TS	359	static const struct snd_pcm_ops pcm_capture_ops = {
	360	.open = pcm_open,
	361	.close = pcm_close,
	362	.ioctl = snd_pcm_lib_ioctl,
49f621fe TS	363	.hw_params = pcm_hw_params,
49f621fe TS	364	.hw_free = pcm_hw_free,
d2dc2a96 TS	365	.prepare = pcm_capture_prepare,
	366	.trigger = pcm_capture_trigger,
	367	.pointer = pcm_capture_pointer,
	368	.ack = pcm_capture_ack,
	369	.page = snd_pcm_lib_get_vmalloc_page,
	370	};
	371	static const struct snd_pcm_ops pcm_playback_ops = {
	372	.open = pcm_open,
	373	.close = pcm_close,
	374	.ioctl = snd_pcm_lib_ioctl,
49f621fe TS	375	.hw_params = pcm_hw_params,
49f621fe TS	376	.hw_free = pcm_hw_free,
d2dc2a96 TS	377	.prepare = pcm_playback_prepare,
	378	.trigger = pcm_playback_trigger,
	379	.pointer = pcm_playback_pointer,
	380	.ack = pcm_playback_ack,
	381	.page = snd_pcm_lib_get_vmalloc_page,
d2dc2a96	382	};
4b316436 TS	383	struct snd_pcm *pcm;
	384	int err;
	385
	386	err = snd_pcm_new(ff->card, ff->card->driver, 0, 1, 1, &pcm);
	387	if (err < 0)
	388	return err;
	389
	390	pcm->private_data = ff;
	391	snprintf(pcm->name, sizeof(pcm->name),
	392	"%s PCM", ff->card->shortname);
	393	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
	394	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
	395
	396	return 0;
	397	}