drivers/media/pci/solo6x10/solo6x10-g723.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2010-2013 Bluecherry, LLC <https://www.bluecherrydvr.com>
  *
  * Original author:
  * Ben Collins <bcollins@ubuntu.com>
  *
  * Additional work by:
  * John Brooks <john.brooks@bluecherry.net>
  */

 #include <linux/kernel.h>
 #include <linux/mempool.h>
 #include <linux/poll.h>
 #include <linux/kthread.h>
 #include <linux/freezer.h>
 #include <linux/module.h>
 #include <linux/slab.h>

 #include <sound/core.h>
 #include <sound/initval.h>
 #include <sound/pcm.h>
 #include <sound/control.h>

 #include "solo6x10.h"
 #include "solo6x10-tw28.h"

 #define G723_FDMA_PAGES		32
 #define G723_PERIOD_BYTES	48
 #define G723_PERIOD_BLOCK	1024
 #define G723_FRAMES_PER_PAGE	48

 /* Sets up channels 16-19 for decoding and 0-15 for encoding */
 #define OUTMODE_MASK		0x300

 #define SAMPLERATE		8000
 #define BITRATE			25

 /* The solo writes to 1k byte pages, 32 pages, in the dma. Each 1k page
  * is broken down to 20 * 48 byte regions (one for each channel possible)
  * with the rest of the page being dummy data. */
 #define PERIODS			G723_FDMA_PAGES
 #define G723_INTR_ORDER		4 /* 0 - 4 */

 struct solo_snd_pcm {
 	int				on;
 	spinlock_t			lock;
 	struct solo_dev			*solo_dev;
 	u8				*g723_buf;
 	dma_addr_t			g723_dma;
 };

 static void solo_g723_config(struct solo_dev *solo_dev)
 {
 	int clk_div;

 	clk_div = (solo_dev->clock_mhz * 1000000)
 		/ (SAMPLERATE * (BITRATE * 2) * 2);

 	solo_reg_write(solo_dev, SOLO_AUDIO_SAMPLE,
 		       SOLO_AUDIO_BITRATE(BITRATE)
 		       | SOLO_AUDIO_CLK_DIV(clk_div));

 	solo_reg_write(solo_dev, SOLO_AUDIO_FDMA_INTR,
 		       SOLO_AUDIO_FDMA_INTERVAL(1)
 		       | SOLO_AUDIO_INTR_ORDER(G723_INTR_ORDER)
 		       | SOLO_AUDIO_FDMA_BASE(SOLO_G723_EXT_ADDR(solo_dev) >> 16));

 	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL,
 		       SOLO_AUDIO_ENABLE
 		       | SOLO_AUDIO_I2S_MODE
 		       | SOLO_AUDIO_I2S_MULTI(3)
 		       | SOLO_AUDIO_MODE(OUTMODE_MASK));
 }

 void solo_g723_isr(struct solo_dev *solo_dev)
 {
 	struct snd_pcm_str *pstr =
 		&solo_dev->snd_pcm->streams[SNDRV_PCM_STREAM_CAPTURE];
 	struct snd_pcm_substream *ss;
 	struct solo_snd_pcm *solo_pcm;

 	for (ss = pstr->substream; ss != NULL; ss = ss->next) {
 		if (snd_pcm_substream_chip(ss) == NULL)
 			continue;

 		/* This means open() hasn't been called on this one */
 		if (snd_pcm_substream_chip(ss) == solo_dev)
 			continue;

 		/* Haven't triggered a start yet */
 		solo_pcm = snd_pcm_substream_chip(ss);
 		if (!solo_pcm->on)
 			continue;

 		snd_pcm_period_elapsed(ss);
 	}
 }

 static const struct snd_pcm_hardware snd_solo_pcm_hw = {
 	.info			= (SNDRV_PCM_INFO_MMAP |
 				   SNDRV_PCM_INFO_INTERLEAVED |
 				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
 				   SNDRV_PCM_INFO_MMAP_VALID),
 	.formats		= SNDRV_PCM_FMTBIT_U8,
 	.rates			= SNDRV_PCM_RATE_8000,
 	.rate_min		= SAMPLERATE,
 	.rate_max		= SAMPLERATE,
 	.channels_min		= 1,
 	.channels_max		= 1,
 	.buffer_bytes_max	= G723_PERIOD_BYTES * PERIODS,
 	.period_bytes_min	= G723_PERIOD_BYTES,
 	.period_bytes_max	= G723_PERIOD_BYTES,
 	.periods_min		= PERIODS,
 	.periods_max		= PERIODS,
 };

 static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
 {
 	struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
 	struct solo_snd_pcm *solo_pcm;

 	solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
 	if (solo_pcm == NULL)
 		goto oom;

 	solo_pcm->g723_buf = dma_alloc_coherent(&solo_dev->pdev->dev,
 						G723_PERIOD_BYTES,
 						&solo_pcm->g723_dma,
 						GFP_KERNEL);
 	if (solo_pcm->g723_buf == NULL)
 		goto oom;

 	spin_lock_init(&solo_pcm->lock);
 	solo_pcm->solo_dev = solo_dev;
 	ss->runtime->hw = snd_solo_pcm_hw;

 	snd_pcm_substream_chip(ss) = solo_pcm;

 	return 0;

 oom:
 	kfree(solo_pcm);
 	return -ENOMEM;
 }

 static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
 {
 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);

 	snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
 	dma_free_coherent(&solo_pcm->solo_dev->pdev->dev, G723_PERIOD_BYTES,
 			  solo_pcm->g723_buf, solo_pcm->g723_dma);
 	kfree(solo_pcm);

 	return 0;
 }

 static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 {
 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
 	int ret = 0;

 	spin_lock(&solo_pcm->lock);

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		if (solo_pcm->on == 0) {
 			/* If this is the first user, switch on interrupts */
 			if (atomic_inc_return(&solo_dev->snd_users) == 1)
 				solo_irq_on(solo_dev, SOLO_IRQ_G723);
 			solo_pcm->on = 1;
 		}
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		if (solo_pcm->on) {
 			/* If this was our last user, switch them off */
 			if (atomic_dec_return(&solo_dev->snd_users) == 0)
 				solo_irq_off(solo_dev, SOLO_IRQ_G723);
 			solo_pcm->on = 0;
 		}
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	spin_unlock(&solo_pcm->lock);

 	return ret;
 }

 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
 {
 	return 0;
 }

 static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
 {
 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
 	snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;

 	return idx * G723_FRAMES_PER_PAGE;
 }

 static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
 			     unsigned long pos, struct iov_iter *dst,
 			     unsigned long count)
 {
 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
 	int err, i;

 	for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
 		int page = (pos / G723_FRAMES_PER_PAGE) + i;

 		err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
 				     SOLO_G723_EXT_ADDR(solo_dev) +
 				     (page * G723_PERIOD_BLOCK) +
 				     (ss->number * G723_PERIOD_BYTES),
 				     G723_PERIOD_BYTES, 0, 0);
 		if (err)
 			return err;

 		if (copy_to_iter(solo_pcm->g723_buf, G723_PERIOD_BYTES, dst) !=
 		    G723_PERIOD_BYTES)
 			return -EFAULT;
 	}

 	return 0;
 }

 static const struct snd_pcm_ops snd_solo_pcm_ops = {
 	.open = snd_solo_pcm_open,
 	.close = snd_solo_pcm_close,
 	.prepare = snd_solo_pcm_prepare,
 	.trigger = snd_solo_pcm_trigger,
 	.pointer = snd_solo_pcm_pointer,
 	.copy = snd_solo_pcm_copy,
 };

 static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
 					struct snd_ctl_elem_info *info)
 {
 	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 	info->count = 1;
 	info->value.integer.min = 0;
 	info->value.integer.max = 15;
 	info->value.integer.step = 1;

 	return 0;
 }

 static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
 				       struct snd_ctl_elem_value *value)
 {
 	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 	u8 ch = value->id.numid - 1;

 	value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);

 	return 0;
 }

 static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
 				       struct snd_ctl_elem_value *value)
 {
 	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 	u8 ch = value->id.numid - 1;
 	u8 old_val;

 	old_val = tw28_get_audio_gain(solo_dev, ch);
 	if (old_val == value->value.integer.value[0])
 		return 0;

 	tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);

 	return 1;
 }

 static const struct snd_kcontrol_new snd_solo_capture_volume = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Capture Volume",
 	.info = snd_solo_capture_volume_info,
 	.get = snd_solo_capture_volume_get,
 	.put = snd_solo_capture_volume_put,
 };

 static int solo_snd_pcm_init(struct solo_dev *solo_dev)
 {
 	struct snd_card *card = solo_dev->snd_card;
 	struct snd_pcm *pcm;
 	struct snd_pcm_substream *ss;
 	int ret;
 	int i;

 	ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
 			  &pcm);
 	if (ret < 0)
 		return ret;

 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 			&snd_solo_pcm_ops);

 	snd_pcm_chip(pcm) = solo_dev;
 	pcm->info_flags = 0;
 	strscpy(pcm->name, card->shortname, sizeof(pcm->name));

 	for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 	     ss; ss = ss->next, i++)
 		sprintf(ss->name, "Camera #%d Audio", i);

 	snd_pcm_set_managed_buffer_all(pcm,
 				       SNDRV_DMA_TYPE_CONTINUOUS,
 				       NULL,
 				       G723_PERIOD_BYTES * PERIODS,
 				       G723_PERIOD_BYTES * PERIODS);

 	solo_dev->snd_pcm = pcm;

 	return 0;
 }

 int solo_g723_init(struct solo_dev *solo_dev)
 {
 	static struct snd_device_ops ops = { };
 	struct snd_card *card;
 	struct snd_kcontrol_new kctl;
 	char name[32];
 	int ret;

 	atomic_set(&solo_dev->snd_users, 0);

 	/* Allows for easier mapping between video and audio */
 	sprintf(name, "Softlogic%d", solo_dev->vfd->num);

 	ret = snd_card_new(&solo_dev->pdev->dev,
 			   SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
 			   &solo_dev->snd_card);
 	if (ret < 0)
 		return ret;

 	card = solo_dev->snd_card;

 	strscpy(card->driver, SOLO6X10_NAME, sizeof(card->driver));
 	strscpy(card->shortname, "SOLO-6x10 Audio", sizeof(card->shortname));
 	sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
 		pci_name(solo_dev->pdev), solo_dev->pdev->irq);

 	ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
 	if (ret < 0)
 		goto snd_error;

 	/* Mixer controls */
 	strscpy(card->mixername, "SOLO-6x10", sizeof(card->mixername));
 	kctl = snd_solo_capture_volume;
 	kctl.count = solo_dev->nr_chans;

 	ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
 	if (ret < 0)
 		goto snd_error;

 	ret = solo_snd_pcm_init(solo_dev);
 	if (ret < 0)
 		goto snd_error;

 	ret = snd_card_register(card);
 	if (ret < 0)
 		goto snd_error;

 	solo_g723_config(solo_dev);

 	dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);

 	return 0;

 snd_error:
 	snd_card_free(card);
 	return ret;
 }

 void solo_g723_exit(struct solo_dev *solo_dev)
 {
 	if (!solo_dev->snd_card)
 		return;

 	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
 	solo_irq_off(solo_dev, SOLO_IRQ_G723);

 	snd_card_free(solo_dev->snd_card);
 	solo_dev->snd_card = NULL;
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright (C) 2010-2013 Bluecherry, LLC <https://www.bluecherrydvr.com>
	*
	* Original author:
	* Ben Collins <bcollins@ubuntu.com>
	*
	* Additional work by:
	* John Brooks <john.brooks@bluecherry.net>
	*/

	#include <linux/kernel.h>
	#include <linux/mempool.h>
	#include <linux/poll.h>
	#include <linux/kthread.h>
	#include <linux/freezer.h>
	#include <linux/module.h>
	#include <linux/slab.h>

	#include <sound/core.h>
	#include <sound/initval.h>
	#include <sound/pcm.h>
	#include <sound/control.h>

	#include "solo6x10.h"
	#include "solo6x10-tw28.h"

	#define G723_FDMA_PAGES 32
	#define G723_PERIOD_BYTES 48
	#define G723_PERIOD_BLOCK 1024
	#define G723_FRAMES_PER_PAGE 48

	/* Sets up channels 16-19 for decoding and 0-15 for encoding */
	#define OUTMODE_MASK 0x300

	#define SAMPLERATE 8000
	#define BITRATE 25

	/* The solo writes to 1k byte pages, 32 pages, in the dma. Each 1k page
	* is broken down to 20 * 48 byte regions (one for each channel possible)
	* with the rest of the page being dummy data. */
	#define PERIODS G723_FDMA_PAGES
	#define G723_INTR_ORDER 4 /* 0 - 4 */

	struct solo_snd_pcm {
	int on;
	spinlock_t lock;
	struct solo_dev *solo_dev;
	u8 *g723_buf;
	dma_addr_t g723_dma;
	};

	static void solo_g723_config(struct solo_dev *solo_dev)
	{
	int clk_div;

	clk_div = (solo_dev->clock_mhz * 1000000)
	/ (SAMPLERATE * (BITRATE * 2) * 2);

	solo_reg_write(solo_dev, SOLO_AUDIO_SAMPLE,
	SOLO_AUDIO_BITRATE(BITRATE)
	\| SOLO_AUDIO_CLK_DIV(clk_div));

	solo_reg_write(solo_dev, SOLO_AUDIO_FDMA_INTR,
	SOLO_AUDIO_FDMA_INTERVAL(1)
	\| SOLO_AUDIO_INTR_ORDER(G723_INTR_ORDER)
	\| SOLO_AUDIO_FDMA_BASE(SOLO_G723_EXT_ADDR(solo_dev) >> 16));

	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL,
	SOLO_AUDIO_ENABLE
	\| SOLO_AUDIO_I2S_MODE
	\| SOLO_AUDIO_I2S_MULTI(3)
	\| SOLO_AUDIO_MODE(OUTMODE_MASK));
	}

	void solo_g723_isr(struct solo_dev *solo_dev)
	{
	struct snd_pcm_str *pstr =
	&solo_dev->snd_pcm->streams[SNDRV_PCM_STREAM_CAPTURE];
	struct snd_pcm_substream *ss;
	struct solo_snd_pcm *solo_pcm;

	for (ss = pstr->substream; ss != NULL; ss = ss->next) {
	if (snd_pcm_substream_chip(ss) == NULL)
	continue;

	/* This means open() hasn't been called on this one */
	if (snd_pcm_substream_chip(ss) == solo_dev)
	continue;

	/* Haven't triggered a start yet */
	solo_pcm = snd_pcm_substream_chip(ss);
	if (!solo_pcm->on)
	continue;

	snd_pcm_period_elapsed(ss);
	}
	}

	static const struct snd_pcm_hardware snd_solo_pcm_hw = {
	.info = (SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	SNDRV_PCM_INFO_MMAP_VALID),
	.formats = SNDRV_PCM_FMTBIT_U8,
	.rates = SNDRV_PCM_RATE_8000,
	.rate_min = SAMPLERATE,
	.rate_max = SAMPLERATE,
	.channels_min = 1,
	.channels_max = 1,
	.buffer_bytes_max = G723_PERIOD_BYTES * PERIODS,
	.period_bytes_min = G723_PERIOD_BYTES,
	.period_bytes_max = G723_PERIOD_BYTES,
	.periods_min = PERIODS,
	.periods_max = PERIODS,
	};

	static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
	{
	struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
	struct solo_snd_pcm *solo_pcm;

	solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
	if (solo_pcm == NULL)
	goto oom;

	solo_pcm->g723_buf = dma_alloc_coherent(&solo_dev->pdev->dev,
	G723_PERIOD_BYTES,
	&solo_pcm->g723_dma,
	GFP_KERNEL);
	if (solo_pcm->g723_buf == NULL)
	goto oom;

	spin_lock_init(&solo_pcm->lock);
	solo_pcm->solo_dev = solo_dev;
	ss->runtime->hw = snd_solo_pcm_hw;

	snd_pcm_substream_chip(ss) = solo_pcm;

	return 0;

	oom:
	kfree(solo_pcm);
	return -ENOMEM;
	}

	static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
	{
	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);

	snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
	dma_free_coherent(&solo_pcm->solo_dev->pdev->dev, G723_PERIOD_BYTES,
	solo_pcm->g723_buf, solo_pcm->g723_dma);
	kfree(solo_pcm);

	return 0;
	}

	static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
	{
	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
	struct solo_dev *solo_dev = solo_pcm->solo_dev;
	int ret = 0;

	spin_lock(&solo_pcm->lock);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	if (solo_pcm->on == 0) {
	/* If this is the first user, switch on interrupts */
	if (atomic_inc_return(&solo_dev->snd_users) == 1)
	solo_irq_on(solo_dev, SOLO_IRQ_G723);
	solo_pcm->on = 1;
	}
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	if (solo_pcm->on) {
	/* If this was our last user, switch them off */
	if (atomic_dec_return(&solo_dev->snd_users) == 0)
	solo_irq_off(solo_dev, SOLO_IRQ_G723);
	solo_pcm->on = 0;
	}
	break;
	default:
	ret = -EINVAL;
	}

	spin_unlock(&solo_pcm->lock);

	return ret;
	}

	static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
	{
	return 0;
	}

	static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
	{
	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
	struct solo_dev *solo_dev = solo_pcm->solo_dev;
	snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;

	return idx * G723_FRAMES_PER_PAGE;
	}

	static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
	unsigned long pos, struct iov_iter *dst,
	unsigned long count)
	{
	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
	struct solo_dev *solo_dev = solo_pcm->solo_dev;
	int err, i;

	for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
	int page = (pos / G723_FRAMES_PER_PAGE) + i;

	err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
	SOLO_G723_EXT_ADDR(solo_dev) +
	(page * G723_PERIOD_BLOCK) +
	(ss->number * G723_PERIOD_BYTES),
	G723_PERIOD_BYTES, 0, 0);
	if (err)
	return err;

	if (copy_to_iter(solo_pcm->g723_buf, G723_PERIOD_BYTES, dst) !=
	G723_PERIOD_BYTES)
	return -EFAULT;
	}

	return 0;
	}

	static const struct snd_pcm_ops snd_solo_pcm_ops = {
	.open = snd_solo_pcm_open,
	.close = snd_solo_pcm_close,
	.prepare = snd_solo_pcm_prepare,
	.trigger = snd_solo_pcm_trigger,
	.pointer = snd_solo_pcm_pointer,
	.copy = snd_solo_pcm_copy,
	};

	static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *info)
	{
	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	info->count = 1;
	info->value.integer.min = 0;
	info->value.integer.max = 15;
	info->value.integer.step = 1;

	return 0;
	}

	static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *value)
	{
	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
	u8 ch = value->id.numid - 1;

	value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);

	return 0;
	}

	static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *value)
	{
	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
	u8 ch = value->id.numid - 1;
	u8 old_val;

	old_val = tw28_get_audio_gain(solo_dev, ch);
	if (old_val == value->value.integer.value[0])
	return 0;

	tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);

	return 1;
	}

	static const struct snd_kcontrol_new snd_solo_capture_volume = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Capture Volume",
	.info = snd_solo_capture_volume_info,
	.get = snd_solo_capture_volume_get,
	.put = snd_solo_capture_volume_put,
	};

	static int solo_snd_pcm_init(struct solo_dev *solo_dev)
	{
	struct snd_card *card = solo_dev->snd_card;
	struct snd_pcm *pcm;
	struct snd_pcm_substream *ss;
	int ret;
	int i;

	ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
	&pcm);
	if (ret < 0)
	return ret;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
	&snd_solo_pcm_ops);

	snd_pcm_chip(pcm) = solo_dev;
	pcm->info_flags = 0;
	strscpy(pcm->name, card->shortname, sizeof(pcm->name));

	for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
	ss; ss = ss->next, i++)
	sprintf(ss->name, "Camera #%d Audio", i);

	snd_pcm_set_managed_buffer_all(pcm,
	SNDRV_DMA_TYPE_CONTINUOUS,
	NULL,
	G723_PERIOD_BYTES * PERIODS,
	G723_PERIOD_BYTES * PERIODS);

	solo_dev->snd_pcm = pcm;

	return 0;
	}

	int solo_g723_init(struct solo_dev *solo_dev)
	{
	static struct snd_device_ops ops = { };
	struct snd_card *card;
	struct snd_kcontrol_new kctl;
	char name[32];
	int ret;

	atomic_set(&solo_dev->snd_users, 0);

	/* Allows for easier mapping between video and audio */
	sprintf(name, "Softlogic%d", solo_dev->vfd->num);

	ret = snd_card_new(&solo_dev->pdev->dev,
	SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
	&solo_dev->snd_card);
	if (ret < 0)
	return ret;

	card = solo_dev->snd_card;

	strscpy(card->driver, SOLO6X10_NAME, sizeof(card->driver));
	strscpy(card->shortname, "SOLO-6x10 Audio", sizeof(card->shortname));
	sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
	pci_name(solo_dev->pdev), solo_dev->pdev->irq);

	ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
	if (ret < 0)
	goto snd_error;

	/* Mixer controls */
	strscpy(card->mixername, "SOLO-6x10", sizeof(card->mixername));
	kctl = snd_solo_capture_volume;
	kctl.count = solo_dev->nr_chans;

	ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
	if (ret < 0)
	goto snd_error;

	ret = solo_snd_pcm_init(solo_dev);
	if (ret < 0)
	goto snd_error;

	ret = snd_card_register(card);
	if (ret < 0)
	goto snd_error;

	solo_g723_config(solo_dev);

	dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);

	return 0;

	snd_error:
	snd_card_free(card);
	return ret;
	}

	void solo_g723_exit(struct solo_dev *solo_dev)
	{
	if (!solo_dev->snd_card)
	return;

	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
	solo_irq_off(solo_dev, SOLO_IRQ_G723);

	snd_card_free(solo_dev->snd_card);
	solo_dev->snd_card = NULL;
	}