[deliverable/linux.git] / sound / firewire / bebob / bebob_pcm.c

/*
 * bebob_pcm.c - a part of driver for BeBoB based devices
 *
 * Copyright (c) 2013-2014 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include "./bebob.h"

static int
hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob_stream_formation *formations = 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 < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry is invalid */
		if (formations[i].pcm == 0)
			continue;

		if (!snd_interval_test(c, formations[i].pcm))
			continue;

		t.min = min(t.min, snd_bebob_rate_table[i]);
		t.max = max(t.max, snd_bebob_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)
{
	struct snd_bebob_stream_formation *formations = 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 < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry is invalid */
		if (formations[i].pcm == 0)
			continue;

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

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

	return snd_interval_refine(c, &t);
}

static void
limit_channels_and_rates(struct snd_pcm_hardware *hw,
			 struct snd_bebob_stream_formation *formations)
{
	unsigned int i;

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

	hw->rate_min = UINT_MAX;
	hw->rate_max = 0;
	hw->rates = 0;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry has no PCM channels */
		if (formations[i].pcm == 0)
			continue;

		hw->channels_min = min(hw->channels_min, formations[i].pcm);
		hw->channels_max = max(hw->channels_max, formations[i].pcm);

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

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;	/* bytes 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
pcm_init_hw_params(struct snd_bebob *bebob,
		   struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct amdtp_stream *s;
	struct snd_bebob_stream_formation *formations;
	int err;

	runtime->hw.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;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS;
		s = &bebob->tx_stream;
		formations = bebob->tx_stream_formations;
	} else {
		runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS;
		s = &bebob->rx_stream;
		formations = bebob->rx_stream_formations;
	}

	limit_channels_and_rates(&runtime->hw, formations);
	limit_period_and_buffer(&runtime->hw);

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				  hw_rule_channels, formations,
				  SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		goto end;

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				  hw_rule_rate, formations,
				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		goto end;

	err = amdtp_am824_add_pcm_hw_constraints(s, runtime);
end:
	return err;
}

static int
pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_bebob *bebob = substream->private_data;
	const struct snd_bebob_rate_spec *spec = bebob->spec->rate;
	unsigned int sampling_rate;
	enum snd_bebob_clock_type src;
	int err;

	err = snd_bebob_stream_lock_try(bebob);
	if (err < 0)
		goto end;

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

	err = snd_bebob_stream_get_clock_src(bebob, &src);
	if (err < 0)
		goto err_locked;

	/*
	 * When source of clock is internal or any PCM stream are running,
	 * the available sampling rate is limited at current sampling rate.
	 */
	if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL ||
	    amdtp_stream_pcm_running(&bebob->tx_stream) ||
	    amdtp_stream_pcm_running(&bebob->rx_stream)) {
		err = spec->get(bebob, &sampling_rate);
		if (err < 0) {
			dev_err(&bebob->unit->device,
				"fail to get sampling rate: %d\n", err);
			goto err_locked;
		}

		substream->runtime->hw.rate_min = sampling_rate;
		substream->runtime->hw.rate_max = sampling_rate;
	}

	snd_pcm_set_sync(substream);
end:
	return err;
err_locked:
	snd_bebob_stream_lock_release(bebob);
	return err;
}

static int
pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_bebob *bebob = substream->private_data;
	snd_bebob_stream_lock_release(bebob);
	return 0;
}

static int
pcm_capture_hw_params(struct snd_pcm_substream *substream,
		      struct snd_pcm_hw_params *hw_params)
{
	struct snd_bebob *bebob = 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)
		atomic_inc(&bebob->substreams_counter);

	amdtp_am824_set_pcm_format(&bebob->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_bebob *bebob = 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)
		atomic_inc(&bebob->substreams_counter);

	amdtp_am824_set_pcm_format(&bebob->rx_stream, params_format(hw_params));

	return 0;
}

static int
pcm_capture_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_bebob *bebob = substream->private_data;

	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
		atomic_dec(&bebob->substreams_counter);

	snd_bebob_stream_stop_duplex(bebob);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
}
static int
pcm_playback_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_bebob *bebob = substream->private_data;

	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
		atomic_dec(&bebob->substreams_counter);

	snd_bebob_stream_stop_duplex(bebob);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
}

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

	err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
	if (err >= 0)
		amdtp_stream_pcm_prepare(&bebob->tx_stream);

	return err;
}
static int
pcm_playback_prepare(struct snd_pcm_substream *substream)
{
	struct snd_bebob *bebob = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
	if (err >= 0)
		amdtp_stream_pcm_prepare(&bebob->rx_stream);

	return err;
}

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

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

	return 0;
}
static int
pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_bebob *bebob = substream->private_data;

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

	return 0;
}

static snd_pcm_uframes_t
pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
{
	struct snd_bebob *bebob = sbstrm->private_data;
	return amdtp_stream_pcm_pointer(&bebob->tx_stream);
}
static snd_pcm_uframes_t
pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
{
	struct snd_bebob *bebob = sbstrm->private_data;
	return amdtp_stream_pcm_pointer(&bebob->rx_stream);
}

static const 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 const 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_bebob_create_pcm_devices(struct snd_bebob *bebob)
{
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
	if (err < 0)
		goto end;

	pcm->private_data = bebob;
	snprintf(pcm->name, sizeof(pcm->name),
		 "%s PCM", bebob->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);
end:
	return err;
}
Commit	Line	Data
fbbebd2c TS	1	/*
	2	* bebob_pcm.c - a part of driver for BeBoB based devices
	3	*
	4	* Copyright (c) 2013-2014 Takashi Sakamoto
	5	*
	6	* Licensed under the terms of the GNU General Public License, version 2.
	7	*/
	8
	9	#include "./bebob.h"
	10
	11	static int
	12	hw_rule_rate(struct snd_pcm_hw_params params, struct snd_pcm_hw_rule rule)
	13	{
	14	struct snd_bebob_stream_formation *formations = rule->private;
	15	struct snd_interval *r =
	16	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	17	const struct snd_interval *c =
	18	hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	19	struct snd_interval t = {
	20	.min = UINT_MAX, .max = 0, .integer = 1
	21	};
	22	unsigned int i;
	23
	24	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
	25	/* entry is invalid */
	26	if (formations[i].pcm == 0)
	27	continue;
	28
	29	if (!snd_interval_test(c, formations[i].pcm))
	30	continue;
	31
	32	t.min = min(t.min, snd_bebob_rate_table[i]);
	33	t.max = max(t.max, snd_bebob_rate_table[i]);
	34
	35	}
	36	return snd_interval_refine(r, &t);
	37	}
	38
	39	static int
	40	hw_rule_channels(struct snd_pcm_hw_params params, struct snd_pcm_hw_rule rule)
	41	{
	42	struct snd_bebob_stream_formation *formations = rule->private;
	43	struct snd_interval *c =
	44	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	45	const struct snd_interval *r =
	46	hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	47	struct snd_interval t = {
	48	.min = UINT_MAX, .max = 0, .integer = 1
	49	};
	50
	51	unsigned int i;
	52
	53	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
	54	/* entry is invalid */
	55	if (formations[i].pcm == 0)
	56	continue;
	57
	58	if (!snd_interval_test(r, snd_bebob_rate_table[i]))
	59	continue;
	60
	61	t.min = min(t.min, formations[i].pcm);
	62	t.max = max(t.max, formations[i].pcm);
	63	}
	64
65	return snd_interval_refine(c, &t);
66	}
67
68	static void
69	limit_channels_and_rates(struct snd_pcm_hardware *hw,
70	struct snd_bebob_stream_formation *formations)
71	{
72	unsigned int i;
73
74	hw->channels_min = UINT_MAX;
75	hw->channels_max = 0;
76
77	hw->rate_min = UINT_MAX;
78	hw->rate_max = 0;
79	hw->rates = 0;
80
81	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
82	/* entry has no PCM channels */
83	if (formations[i].pcm == 0)
84	continue;
85
86	hw->channels_min = min(hw->channels_min, formations[i].pcm);
87	hw->channels_max = max(hw->channels_max, formations[i].pcm);
88
89	hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]);
90	hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]);
91	hw->rates \|= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]);
92	}
93	}
94
95	static void
96	limit_period_and_buffer(struct snd_pcm_hardware *hw)
97	{
98	hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */
99	hw->periods_max = UINT_MAX;
100
101	hw->period_bytes_min = 4 * hw->channels_max; /* bytes for a frame */
102
103	/* Just to prevent from allocating much pages. */
104	hw->period_bytes_max = hw->period_bytes_min * 2048;
105	hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
106	}
107
108	static int
109	pcm_init_hw_params(struct snd_bebob *bebob,
110	struct snd_pcm_substream *substream)
111	{
112	struct snd_pcm_runtime *runtime = substream->runtime;
113	struct amdtp_stream *s;
114	struct snd_bebob_stream_formation *formations;
115	int err;
116
117	runtime->hw.info = SNDRV_PCM_INFO_BATCH \|
118	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
119	SNDRV_PCM_INFO_INTERLEAVED \|
120	SNDRV_PCM_INFO_JOINT_DUPLEX \|
121	SNDRV_PCM_INFO_MMAP \|
122	SNDRV_PCM_INFO_MMAP_VALID;
123
124	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
49c7b3fc	125	runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS;
fbbebd2c TS	126	s = &bebob->tx_stream;
	127	formations = bebob->tx_stream_formations;
	128	} else {
49c7b3fc	129	runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS;
fbbebd2c TS	130	s = &bebob->rx_stream;
	131	formations = bebob->rx_stream_formations;
	132	}
	133
	134	limit_channels_and_rates(&runtime->hw, formations);
	135	limit_period_and_buffer(&runtime->hw);
	136
	137	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
	138	hw_rule_channels, formations,
	139	SNDRV_PCM_HW_PARAM_RATE, -1);
	140	if (err < 0)
	141	goto end;
	142
	143	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
	144	hw_rule_rate, formations,
	145	SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	146	if (err < 0)
	147	goto end;
	148
bc8500da	149	err = amdtp_am824_add_pcm_hw_constraints(s, runtime);
fbbebd2c TS	150	end:
	151	return err;
	152	}
	153
	154	static int
	155	pcm_open(struct snd_pcm_substream *substream)
	156	{
	157	struct snd_bebob *bebob = substream->private_data;
6b9866c8	158	const struct snd_bebob_rate_spec *spec = bebob->spec->rate;
fbbebd2c	159	unsigned int sampling_rate;
3e254b16	160	enum snd_bebob_clock_type src;
fbbebd2c TS	161	int err;
fbbebd2c TS	162
618eabea	163	err = snd_bebob_stream_lock_try(bebob);
fbbebd2c TS	164	if (err < 0)
	165	goto end;
	166
618eabea TS	167	err = pcm_init_hw_params(bebob, substream);
	168	if (err < 0)
	169	goto err_locked;
	170
3e254b16	171	err = snd_bebob_stream_get_clock_src(bebob, &src);
fbbebd2c	172	if (err < 0)
618eabea	173	goto err_locked;
fbbebd2c TS	174
	175	/*
	176	* When source of clock is internal or any PCM stream are running,
	177	* the available sampling rate is limited at current sampling rate.
	178	*/
3e254b16	179	if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL \|\|
fbbebd2c TS	180	amdtp_stream_pcm_running(&bebob->tx_stream) \|\|
fbbebd2c TS	181	amdtp_stream_pcm_running(&bebob->rx_stream)) {
1fc9522a	182	err = spec->get(bebob, &sampling_rate);
fbbebd2c TS	183	if (err < 0) {
	184	dev_err(&bebob->unit->device,
	185	"fail to get sampling rate: %d\n", err);
618eabea	186	goto err_locked;
fbbebd2c TS	187	}
	188
	189	substream->runtime->hw.rate_min = sampling_rate;
	190	substream->runtime->hw.rate_max = sampling_rate;
	191	}
	192
	193	snd_pcm_set_sync(substream);
fbbebd2c TS	194	end:
fbbebd2c TS	195	return err;
618eabea TS	196	err_locked:
	197	snd_bebob_stream_lock_release(bebob);
	198	return err;
fbbebd2c TS	199	}
	200
	201	static int
	202	pcm_close(struct snd_pcm_substream *substream)
	203	{
618eabea TS	204	struct snd_bebob *bebob = substream->private_data;
618eabea TS	205	snd_bebob_stream_lock_release(bebob);
fbbebd2c TS	206	return 0;
	207	}
	208
	209	static int
	210	pcm_capture_hw_params(struct snd_pcm_substream *substream,
	211	struct snd_pcm_hw_params *hw_params)
	212	{
	213	struct snd_bebob *bebob = substream->private_data;
22c103cd TS	214	int err;
	215
	216	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	217	params_buffer_bytes(hw_params));
	218	if (err < 0)
	219	return err;
fbbebd2c TS	220
fbbebd2c TS	221	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
8d1c2694	222	atomic_inc(&bebob->substreams_counter);
85130cb4 TS	223
85130cb4 TS	224	amdtp_am824_set_pcm_format(&bebob->tx_stream, params_format(hw_params));
22c103cd TS	225
22c103cd TS	226	return 0;
fbbebd2c TS	227	}
	228	static int
	229	pcm_playback_hw_params(struct snd_pcm_substream *substream,
	230	struct snd_pcm_hw_params *hw_params)
	231	{
	232	struct snd_bebob *bebob = substream->private_data;
22c103cd TS	233	int err;
	234
	235	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	236	params_buffer_bytes(hw_params));
	237	if (err < 0)
	238	return err;
fbbebd2c TS	239
fbbebd2c TS	240	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
8d1c2694	241	atomic_inc(&bebob->substreams_counter);
85130cb4 TS	242
85130cb4 TS	243	amdtp_am824_set_pcm_format(&bebob->rx_stream, params_format(hw_params));
22c103cd TS	244
22c103cd TS	245	return 0;
fbbebd2c TS	246	}
	247
	248	static int
	249	pcm_capture_hw_free(struct snd_pcm_substream *substream)
	250	{
	251	struct snd_bebob *bebob = substream->private_data;
	252
	253	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
8d1c2694	254	atomic_dec(&bebob->substreams_counter);
fbbebd2c TS	255
	256	snd_bebob_stream_stop_duplex(bebob);
	257
	258	return snd_pcm_lib_free_vmalloc_buffer(substream);
	259	}
	260	static int
	261	pcm_playback_hw_free(struct snd_pcm_substream *substream)
	262	{
	263	struct snd_bebob *bebob = substream->private_data;
	264
	265	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
8d1c2694	266	atomic_dec(&bebob->substreams_counter);
fbbebd2c TS	267
	268	snd_bebob_stream_stop_duplex(bebob);
	269
	270	return snd_pcm_lib_free_vmalloc_buffer(substream);
	271	}
	272
	273	static int
	274	pcm_capture_prepare(struct snd_pcm_substream *substream)
	275	{
	276	struct snd_bebob *bebob = substream->private_data;
	277	struct snd_pcm_runtime *runtime = substream->runtime;
	278	int err;
	279
	280	err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
	281	if (err >= 0)
	282	amdtp_stream_pcm_prepare(&bebob->tx_stream);
	283
	284	return err;
	285	}
	286	static int
	287	pcm_playback_prepare(struct snd_pcm_substream *substream)
	288	{
	289	struct snd_bebob *bebob = substream->private_data;
	290	struct snd_pcm_runtime *runtime = substream->runtime;
	291	int err;
	292
	293	err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
	294	if (err >= 0)
	295	amdtp_stream_pcm_prepare(&bebob->rx_stream);
	296
	297	return err;
	298	}
	299
	300	static int
	301	pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
	302	{
	303	struct snd_bebob *bebob = substream->private_data;
	304
	305	switch (cmd) {
	306	case SNDRV_PCM_TRIGGER_START:
	307	amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
	308	break;
	309	case SNDRV_PCM_TRIGGER_STOP:
	310	amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
	311	break;
	312	default:
	313	return -EINVAL;
	314	}
	315
	316	return 0;
	317	}
	318	static int
	319	pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
	320	{
	321	struct snd_bebob *bebob = substream->private_data;
	322
	323	switch (cmd) {
	324	case SNDRV_PCM_TRIGGER_START:
	325	amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
	326	break;
	327	case SNDRV_PCM_TRIGGER_STOP:
	328	amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
	329	break;
	330	default:
331	return -EINVAL;
332	}
333
334	return 0;
335	}
336
337	static snd_pcm_uframes_t
338	pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
339	{
340	struct snd_bebob *bebob = sbstrm->private_data;
341	return amdtp_stream_pcm_pointer(&bebob->tx_stream);
342	}
343	static snd_pcm_uframes_t
344	pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
345	{
346	struct snd_bebob *bebob = sbstrm->private_data;
347	return amdtp_stream_pcm_pointer(&bebob->rx_stream);
348	}
349
350	static const struct snd_pcm_ops pcm_capture_ops = {
351	.open = pcm_open,
352	.close = pcm_close,
353	.ioctl = snd_pcm_lib_ioctl,
354	.hw_params = pcm_capture_hw_params,
355	.hw_free = pcm_capture_hw_free,
356	.prepare = pcm_capture_prepare,
357	.trigger = pcm_capture_trigger,
358	.pointer = pcm_capture_pointer,
359	.page = snd_pcm_lib_get_vmalloc_page,
360	};
361	static const struct snd_pcm_ops pcm_playback_ops = {
362	.open = pcm_open,
363	.close = pcm_close,
364	.ioctl = snd_pcm_lib_ioctl,
365	.hw_params = pcm_playback_hw_params,
366	.hw_free = pcm_playback_hw_free,
367	.prepare = pcm_playback_prepare,
368	.trigger = pcm_playback_trigger,
369	.pointer = pcm_playback_pointer,
370	.page = snd_pcm_lib_get_vmalloc_page,
371	.mmap = snd_pcm_lib_mmap_vmalloc,
372	};
373
374	int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
375	{
376	struct snd_pcm *pcm;
377	int err;
378
379	err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
380	if (err < 0)
381	goto end;
382
383	pcm->private_data = bebob;
384	snprintf(pcm->name, sizeof(pcm->name),
385	"%s PCM", bebob->card->shortname);
386	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
387	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
388	end:
389	return err;
390	}