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Commit fbbebd2c authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
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ALSA: bebob: Add PCM interface 



This commit adds a functionality to capture/playback PCM samples.

When AMDTP stream is already running for PCM or the source of clock is not
internal, available sampling rate is limited at current one.

Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 248b7802

sound/firewire/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -83,6 +83,7 @@ config SND_BEBOB 
	tristate "BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware"

	select SND_FIREWIRE_LIB

	select SND_RAWMIDI

	select SND_PCM

        help

	 Say Y here to include support for FireWire devices based

	 on BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware:

sound/firewire/bebob/Makefile

+1 −0
Original line number Diff line number Diff line 
snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.o bebob_midi.o \

		  bebob_pcm.o \

		  bebob.o

obj-m += snd-bebob.o

sound/firewire/bebob/bebob.c

+4 −0
Original line number Diff line number Diff line
@@ -171,6 +171,10 @@ bebob_probe(struct fw_unit *unit, 
			goto error;

	}



	err = snd_bebob_create_pcm_devices(bebob);

	if (err < 0)

		goto error;



	err = snd_bebob_stream_init_duplex(bebob);

	if (err < 0)

		goto error;

sound/firewire/bebob/bebob.h

+4 −0
Original line number Diff line number Diff line
@@ -22,6 +22,8 @@ 
#include <sound/initval.h>

#include <sound/info.h>

#include <sound/rawmidi.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>



#include "../lib.h"

#include "../fcp.h"
@@ -177,6 +179,8 @@ void snd_bebob_proc_init(struct snd_bebob *bebob); 


int snd_bebob_create_midi_devices(struct snd_bebob *bebob);



int snd_bebob_create_pcm_devices(struct snd_bebob *bebob);



#define SND_BEBOB_DEV_ENTRY(vendor, model) \

{ \

	.match_flags	= IEEE1394_MATCH_VENDOR_ID | \

sound/firewire/bebob/bebob_pcm.c

0 → 100644
+369 −0
Original line number Diff line number Diff line 
/*

 * 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 = AMDTP_IN_PCM_FORMAT_BITS;

		s = &bebob->tx_stream;

		formations = bebob->tx_stream_formations;

	} else {

		runtime->hw.formats = AMDTP_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_stream_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;

	unsigned int sampling_rate;

	bool internal;

	int err;



	err = pcm_init_hw_params(bebob, substream);

	if (err < 0)

		goto end;



	err = snd_bebob_stream_check_internal_clock(bebob, &internal);

	if (err < 0)

		goto end;



	/*

	 * When source of clock is internal or any PCM stream are running,

	 * the available sampling rate is limited at current sampling rate.

	 */

	if (!internal ||

	    amdtp_stream_pcm_running(&bebob->tx_stream) ||

	    amdtp_stream_pcm_running(&bebob->rx_stream)) {

		err = snd_bebob_stream_get_rate(bebob, &sampling_rate);

		if (err < 0) {

			dev_err(&bebob->unit->device,

				"fail to get sampling rate: %d\n", err);

			goto end;

		}



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

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

	}



	snd_pcm_set_sync(substream);



end:

	return err;

}



static int

pcm_close(struct snd_pcm_substream *substream)

{

	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;



	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)

		atomic_inc(&bebob->capture_substreams);

	amdtp_stream_set_pcm_format(&bebob->tx_stream,

				    params_format(hw_params));

	return snd_pcm_lib_alloc_vmalloc_buffer(substream,

						params_buffer_bytes(hw_params));

}

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;



	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)

		atomic_inc(&bebob->playback_substreams);

	amdtp_stream_set_pcm_format(&bebob->rx_stream,

				    params_format(hw_params));

	return snd_pcm_lib_alloc_vmalloc_buffer(substream,

						params_buffer_bytes(hw_params));

}



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->capture_substreams);



	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->playback_substreams);



	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;

}