sound/pci/aw2/aw2-alsa.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*****************************************************************************
  *
  * Copyright (C) 2008 Cedric Bregardis <cedric.bregardis@free.fr> and
  * Jean-Christian Hassler <jhassler@free.fr>
  *
  * This file is part of the Audiowerk2 ALSA driver
  *
  *****************************************************************************/
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <sound/core.h>
 #include <sound/initval.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/control.h>

 #include "saa7146.h"
 #include "aw2-saa7146.h"

 MODULE_AUTHOR("Cedric Bregardis <cedric.bregardis@free.fr>, "
 	      "Jean-Christian Hassler <jhassler@free.fr>");
 MODULE_DESCRIPTION("Emagic Audiowerk 2 sound driver");
 MODULE_LICENSE("GPL");

 /*********************************
  * DEFINES
  ********************************/
 #define CTL_ROUTE_ANALOG 0
 #define CTL_ROUTE_DIGITAL 1

 /*********************************
  * TYPEDEFS
  ********************************/
   /* hardware definition */
 static const struct snd_pcm_hardware snd_aw2_playback_hw = {
 	.info = (SNDRV_PCM_INFO_MMAP |
 		 SNDRV_PCM_INFO_INTERLEAVED |
 		 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
 	.formats = SNDRV_PCM_FMTBIT_S16_LE,
 	.rates = SNDRV_PCM_RATE_44100,
 	.rate_min = 44100,
 	.rate_max = 44100,
 	.channels_min = 2,
 	.channels_max = 4,
 	.buffer_bytes_max = 32768,
 	.period_bytes_min = 4096,
 	.period_bytes_max = 32768,
 	.periods_min = 1,
 	.periods_max = 1024,
 };

 static const struct snd_pcm_hardware snd_aw2_capture_hw = {
 	.info = (SNDRV_PCM_INFO_MMAP |
 		 SNDRV_PCM_INFO_INTERLEAVED |
 		 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
 	.formats = SNDRV_PCM_FMTBIT_S16_LE,
 	.rates = SNDRV_PCM_RATE_44100,
 	.rate_min = 44100,
 	.rate_max = 44100,
 	.channels_min = 2,
 	.channels_max = 2,
 	.buffer_bytes_max = 32768,
 	.period_bytes_min = 4096,
 	.period_bytes_max = 32768,
 	.periods_min = 1,
 	.periods_max = 1024,
 };

 struct aw2_pcm_device {
 	struct snd_pcm *pcm;
 	unsigned int stream_number;
 	struct aw2 *chip;
 };

 struct aw2 {
 	struct snd_aw2_saa7146 saa7146;

 	struct pci_dev *pci;
 	int irq;
 	spinlock_t reg_lock;
 	struct mutex mtx;

 	unsigned long iobase_phys;
 	void __iomem *iobase_virt;

 	struct snd_card *card;

 	struct aw2_pcm_device device_playback[NB_STREAM_PLAYBACK];
 	struct aw2_pcm_device device_capture[NB_STREAM_CAPTURE];
 };

 /*********************************
  * FUNCTION DECLARATIONS
  ********************************/
 static int snd_aw2_dev_free(struct snd_device *device);
 static int snd_aw2_create(struct snd_card *card,
 			  struct pci_dev *pci, struct aw2 **rchip);
 static int snd_aw2_probe(struct pci_dev *pci,
 			 const struct pci_device_id *pci_id);
 static void snd_aw2_remove(struct pci_dev *pci);
 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream);
 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream);
 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream);
 static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream);
 static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream);
 static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream);
 static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
 					int cmd);
 static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
 				       int cmd);
 static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
 						      *substream);
 static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
 						     *substream);
 static int snd_aw2_new_pcm(struct aw2 *chip);

 static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
 					       struct snd_ctl_elem_info *uinfo);
 static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
 					      struct snd_ctl_elem_value
 					      *ucontrol);
 static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
 					      struct snd_ctl_elem_value
 					      *ucontrol);

 /*********************************
  * VARIABLES
  ********************************/
 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for Audiowerk2 soundcard.");
 module_param_array(id, charp, NULL, 0444);
 MODULE_PARM_DESC(id, "ID string for the Audiowerk2 soundcard.");
 module_param_array(enable, bool, NULL, 0444);
 MODULE_PARM_DESC(enable, "Enable Audiowerk2 soundcard.");

 static const struct pci_device_id snd_aw2_ids[] = {
 	{PCI_VENDOR_ID_PHILIPS, PCI_DEVICE_ID_PHILIPS_SAA7146, 0, 0,
 	 0, 0, 0},
 	{0}
 };

 MODULE_DEVICE_TABLE(pci, snd_aw2_ids);

 /* pci_driver definition */
 static struct pci_driver aw2_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = snd_aw2_ids,
 	.probe = snd_aw2_probe,
 	.remove = snd_aw2_remove,
 };

 module_pci_driver(aw2_driver);

 /* operators for playback PCM alsa interface */
 static const struct snd_pcm_ops snd_aw2_playback_ops = {
 	.open = snd_aw2_pcm_playback_open,
 	.close = snd_aw2_pcm_playback_close,
 	.prepare = snd_aw2_pcm_prepare_playback,
 	.trigger = snd_aw2_pcm_trigger_playback,
 	.pointer = snd_aw2_pcm_pointer_playback,
 };

 /* operators for capture PCM alsa interface */
 static const struct snd_pcm_ops snd_aw2_capture_ops = {
 	.open = snd_aw2_pcm_capture_open,
 	.close = snd_aw2_pcm_capture_close,
 	.prepare = snd_aw2_pcm_prepare_capture,
 	.trigger = snd_aw2_pcm_trigger_capture,
 	.pointer = snd_aw2_pcm_pointer_capture,
 };

 static const struct snd_kcontrol_new aw2_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "PCM Capture Route",
 	.index = 0,
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 	.private_value = 0xffff,
 	.info = snd_aw2_control_switch_capture_info,
 	.get = snd_aw2_control_switch_capture_get,
 	.put = snd_aw2_control_switch_capture_put
 };

 /*********************************
  * FUNCTION IMPLEMENTATIONS
  ********************************/

 /* component-destructor */
 static int snd_aw2_dev_free(struct snd_device *device)
 {
 	struct aw2 *chip = device->device_data;

 	/* Free hardware */
 	snd_aw2_saa7146_free(&chip->saa7146);

 	/* release the irq */
 	if (chip->irq >= 0)
 		free_irq(chip->irq, (void *)chip);
 	/* release the i/o ports & memory */
 	iounmap(chip->iobase_virt);
 	pci_release_regions(chip->pci);
 	/* disable the PCI entry */
 	pci_disable_device(chip->pci);
 	/* release the data */
 	kfree(chip);

 	return 0;
 }

 /* chip-specific constructor */
 static int snd_aw2_create(struct snd_card *card,
 			  struct pci_dev *pci, struct aw2 **rchip)
 {
 	struct aw2 *chip;
 	int err;
 	static const struct snd_device_ops ops = {
 		.dev_free = snd_aw2_dev_free,
 	};

 	*rchip = NULL;

 	/* initialize the PCI entry */
 	err = pci_enable_device(pci);
 	if (err < 0)
 		return err;
 	pci_set_master(pci);

 	/* check PCI availability (32bit DMA) */
 	if ((dma_set_mask(&pci->dev, DMA_BIT_MASK(32)) < 0) ||
 	    (dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(32)) < 0)) {
 		dev_err(card->dev, "Impossible to set 32bit mask DMA\n");
 		pci_disable_device(pci);
 		return -ENXIO;
 	}
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL) {
 		pci_disable_device(pci);
 		return -ENOMEM;
 	}

 	/* initialize the stuff */
 	chip->card = card;
 	chip->pci = pci;
 	chip->irq = -1;

 	/* (1) PCI resource allocation */
 	err = pci_request_regions(pci, "Audiowerk2");
 	if (err < 0) {
 		pci_disable_device(pci);
 		kfree(chip);
 		return err;
 	}
 	chip->iobase_phys = pci_resource_start(pci, 0);
 	chip->iobase_virt =
 		ioremap(chip->iobase_phys,
 				pci_resource_len(pci, 0));

 	if (chip->iobase_virt == NULL) {
 		dev_err(card->dev, "unable to remap memory region");
 		pci_release_regions(pci);
 		pci_disable_device(pci);
 		kfree(chip);
 		return -ENOMEM;
 	}

 	/* (2) initialization of the chip hardware */
 	snd_aw2_saa7146_setup(&chip->saa7146, chip->iobase_virt);

 	if (request_irq(pci->irq, snd_aw2_saa7146_interrupt,
 			IRQF_SHARED, KBUILD_MODNAME, chip)) {
 		dev_err(card->dev, "Cannot grab irq %d\n", pci->irq);

 		iounmap(chip->iobase_virt);
 		pci_release_regions(chip->pci);
 		pci_disable_device(chip->pci);
 		kfree(chip);
 		return -EBUSY;
 	}
 	chip->irq = pci->irq;
 	card->sync_irq = chip->irq;

 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 	if (err < 0) {
 		free_irq(chip->irq, (void *)chip);
 		iounmap(chip->iobase_virt);
 		pci_release_regions(chip->pci);
 		pci_disable_device(chip->pci);
 		kfree(chip);
 		return err;
 	}

 	*rchip = chip;

 	dev_info(card->dev,
 		 "Audiowerk 2 sound card (saa7146 chipset) detected and managed\n");
 	return 0;
 }

 /* constructor */
 static int snd_aw2_probe(struct pci_dev *pci,
 			 const struct pci_device_id *pci_id)
 {
 	static int dev;
 	struct snd_card *card;
 	struct aw2 *chip;
 	int err;

 	/* (1) Continue if device is not enabled, else inc dev */
 	if (dev >= SNDRV_CARDS)
 		return -ENODEV;
 	if (!enable[dev]) {
 		dev++;
 		return -ENOENT;
 	}

 	/* (2) Create card instance */
 	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
 			   0, &card);
 	if (err < 0)
 		return err;

 	/* (3) Create main component */
 	err = snd_aw2_create(card, pci, &chip);
 	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}

 	/* initialize mutex */
 	mutex_init(&chip->mtx);
 	/* init spinlock */
 	spin_lock_init(&chip->reg_lock);
 	/* (4) Define driver ID and name string */
 	strcpy(card->driver, "aw2");
 	strcpy(card->shortname, "Audiowerk2");

 	sprintf(card->longname, "%s with SAA7146 irq %i",
 		card->shortname, chip->irq);

 	/* (5) Create other components */
 	snd_aw2_new_pcm(chip);

 	/* (6) Register card instance */
 	err = snd_card_register(card);
 	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}

 	/* (7) Set PCI driver data */
 	pci_set_drvdata(pci, card);

 	dev++;
 	return 0;
 }

 /* destructor */
 static void snd_aw2_remove(struct pci_dev *pci)
 {
 	snd_card_free(pci_get_drvdata(pci));
 }

 /* open callback */
 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;

 	dev_dbg(substream->pcm->card->dev, "Playback_open\n");
 	runtime->hw = snd_aw2_playback_hw;
 	return 0;
 }

 /* close callback */
 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream)
 {
 	return 0;

 }

 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;

 	dev_dbg(substream->pcm->card->dev, "Capture_open\n");
 	runtime->hw = snd_aw2_capture_hw;
 	return 0;
 }

 /* close callback */
 static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream)
 {
 	/* TODO: something to do ? */
 	return 0;
 }

 /* prepare callback for playback */
 static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream)
 {
 	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 	struct aw2 *chip = pcm_device->chip;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	unsigned long period_size, buffer_size;

 	mutex_lock(&chip->mtx);

 	period_size = snd_pcm_lib_period_bytes(substream);
 	buffer_size = snd_pcm_lib_buffer_bytes(substream);

 	snd_aw2_saa7146_pcm_init_playback(&chip->saa7146,
 					  pcm_device->stream_number,
 					  runtime->dma_addr, period_size,
 					  buffer_size);

 	/* Define Interrupt callback */
 	snd_aw2_saa7146_define_it_playback_callback(pcm_device->stream_number,
 						    (snd_aw2_saa7146_it_cb)
 						    snd_pcm_period_elapsed,
 						    (void *)substream);

 	mutex_unlock(&chip->mtx);

 	return 0;
 }

 /* prepare callback for capture */
 static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream)
 {
 	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 	struct aw2 *chip = pcm_device->chip;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	unsigned long period_size, buffer_size;

 	mutex_lock(&chip->mtx);

 	period_size = snd_pcm_lib_period_bytes(substream);
 	buffer_size = snd_pcm_lib_buffer_bytes(substream);

 	snd_aw2_saa7146_pcm_init_capture(&chip->saa7146,
 					 pcm_device->stream_number,
 					 runtime->dma_addr, period_size,
 					 buffer_size);

 	/* Define Interrupt callback */
 	snd_aw2_saa7146_define_it_capture_callback(pcm_device->stream_number,
 						   (snd_aw2_saa7146_it_cb)
 						   snd_pcm_period_elapsed,
 						   (void *)substream);

 	mutex_unlock(&chip->mtx);

 	return 0;
 }

 /* playback trigger callback */
 static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
 					int cmd)
 {
 	int status = 0;
 	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 	struct aw2 *chip = pcm_device->chip;
 	spin_lock(&chip->reg_lock);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		snd_aw2_saa7146_pcm_trigger_start_playback(&chip->saa7146,
 							   pcm_device->
 							   stream_number);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		snd_aw2_saa7146_pcm_trigger_stop_playback(&chip->saa7146,
 							  pcm_device->
 							  stream_number);
 		break;
 	default:
 		status = -EINVAL;
 	}
 	spin_unlock(&chip->reg_lock);
 	return status;
 }

 /* capture trigger callback */
 static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
 				       int cmd)
 {
 	int status = 0;
 	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 	struct aw2 *chip = pcm_device->chip;
 	spin_lock(&chip->reg_lock);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		snd_aw2_saa7146_pcm_trigger_start_capture(&chip->saa7146,
 							  pcm_device->
 							  stream_number);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		snd_aw2_saa7146_pcm_trigger_stop_capture(&chip->saa7146,
 							 pcm_device->
 							 stream_number);
 		break;
 	default:
 		status = -EINVAL;
 	}
 	spin_unlock(&chip->reg_lock);
 	return status;
 }

 /* playback pointer callback */
 static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
 						      *substream)
 {
 	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 	struct aw2 *chip = pcm_device->chip;
 	unsigned int current_ptr;

 	/* get the current hardware pointer */
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	current_ptr =
 		snd_aw2_saa7146_get_hw_ptr_playback(&chip->saa7146,
 						    pcm_device->stream_number,
 						    runtime->dma_area,
 						    runtime->buffer_size);

 	return bytes_to_frames(substream->runtime, current_ptr);
 }

 /* capture pointer callback */
 static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
 						     *substream)
 {
 	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 	struct aw2 *chip = pcm_device->chip;
 	unsigned int current_ptr;

 	/* get the current hardware pointer */
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	current_ptr =
 		snd_aw2_saa7146_get_hw_ptr_capture(&chip->saa7146,
 						   pcm_device->stream_number,
 						   runtime->dma_area,
 						   runtime->buffer_size);

 	return bytes_to_frames(substream->runtime, current_ptr);
 }

 /* create a pcm device */
 static int snd_aw2_new_pcm(struct aw2 *chip)
 {
 	struct snd_pcm *pcm_playback_ana;
 	struct snd_pcm *pcm_playback_num;
 	struct snd_pcm *pcm_capture;
 	struct aw2_pcm_device *pcm_device;
 	int err = 0;

 	/* Create new Alsa PCM device */

 	err = snd_pcm_new(chip->card, "Audiowerk2 analog playback", 0, 1, 0,
 			  &pcm_playback_ana);
 	if (err < 0) {
 		dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 		return err;
 	}

 	/* Creation ok */
 	pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_ANA];

 	/* Set PCM device name */
 	strcpy(pcm_playback_ana->name, "Analog playback");
 	/* Associate private data to PCM device */
 	pcm_playback_ana->private_data = pcm_device;
 	/* set operators of PCM device */
 	snd_pcm_set_ops(pcm_playback_ana, SNDRV_PCM_STREAM_PLAYBACK,
 			&snd_aw2_playback_ops);
 	/* store PCM device */
 	pcm_device->pcm = pcm_playback_ana;
 	/* give base chip pointer to our internal pcm device
 	   structure */
 	pcm_device->chip = chip;
 	/* Give stream number to PCM device */
 	pcm_device->stream_number = NUM_STREAM_PLAYBACK_ANA;

 	/* pre-allocation of buffers */
 	/* Preallocate continuous pages. */
 	snd_pcm_set_managed_buffer_all(pcm_playback_ana,
 				       SNDRV_DMA_TYPE_DEV,
 				       &chip->pci->dev,
 				       64 * 1024, 64 * 1024);

 	err = snd_pcm_new(chip->card, "Audiowerk2 digital playback", 1, 1, 0,
 			  &pcm_playback_num);

 	if (err < 0) {
 		dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 		return err;
 	}
 	/* Creation ok */
 	pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_DIG];

 	/* Set PCM device name */
 	strcpy(pcm_playback_num->name, "Digital playback");
 	/* Associate private data to PCM device */
 	pcm_playback_num->private_data = pcm_device;
 	/* set operators of PCM device */
 	snd_pcm_set_ops(pcm_playback_num, SNDRV_PCM_STREAM_PLAYBACK,
 			&snd_aw2_playback_ops);
 	/* store PCM device */
 	pcm_device->pcm = pcm_playback_num;
 	/* give base chip pointer to our internal pcm device
 	   structure */
 	pcm_device->chip = chip;
 	/* Give stream number to PCM device */
 	pcm_device->stream_number = NUM_STREAM_PLAYBACK_DIG;

 	/* pre-allocation of buffers */
 	/* Preallocate continuous pages. */
 	snd_pcm_set_managed_buffer_all(pcm_playback_num,
 				       SNDRV_DMA_TYPE_DEV,
 				       &chip->pci->dev,
 				       64 * 1024, 64 * 1024);

 	err = snd_pcm_new(chip->card, "Audiowerk2 capture", 2, 0, 1,
 			  &pcm_capture);

 	if (err < 0) {
 		dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 		return err;
 	}

 	/* Creation ok */
 	pcm_device = &chip->device_capture[NUM_STREAM_CAPTURE_ANA];

 	/* Set PCM device name */
 	strcpy(pcm_capture->name, "Capture");
 	/* Associate private data to PCM device */
 	pcm_capture->private_data = pcm_device;
 	/* set operators of PCM device */
 	snd_pcm_set_ops(pcm_capture, SNDRV_PCM_STREAM_CAPTURE,
 			&snd_aw2_capture_ops);
 	/* store PCM device */
 	pcm_device->pcm = pcm_capture;
 	/* give base chip pointer to our internal pcm device
 	   structure */
 	pcm_device->chip = chip;
 	/* Give stream number to PCM device */
 	pcm_device->stream_number = NUM_STREAM_CAPTURE_ANA;

 	/* pre-allocation of buffers */
 	/* Preallocate continuous pages. */
 	snd_pcm_set_managed_buffer_all(pcm_capture,
 				       SNDRV_DMA_TYPE_DEV,
 				       &chip->pci->dev,
 				       64 * 1024, 64 * 1024);

 	/* Create control */
 	err = snd_ctl_add(chip->card, snd_ctl_new1(&aw2_control, chip));
 	if (err < 0) {
 		dev_err(chip->card->dev, "snd_ctl_add error (0x%X)\n", err);
 		return err;
 	}

 	return 0;
 }

 static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
 					       struct snd_ctl_elem_info *uinfo)
 {
 	static const char * const texts[2] = {
 		"Analog", "Digital"
 	};
 	return snd_ctl_enum_info(uinfo, 1, 2, texts);
 }

 static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
 					      struct snd_ctl_elem_value
 					      *ucontrol)
 {
 	struct aw2 *chip = snd_kcontrol_chip(kcontrol);
 	if (snd_aw2_saa7146_is_using_digital_input(&chip->saa7146))
 		ucontrol->value.enumerated.item[0] = CTL_ROUTE_DIGITAL;
 	else
 		ucontrol->value.enumerated.item[0] = CTL_ROUTE_ANALOG;
 	return 0;
 }

 static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
 					      struct snd_ctl_elem_value
 					      *ucontrol)
 {
 	struct aw2 *chip = snd_kcontrol_chip(kcontrol);
 	int changed = 0;
 	int is_disgital =
 	    snd_aw2_saa7146_is_using_digital_input(&chip->saa7146);

 	if (((ucontrol->value.integer.value[0] == CTL_ROUTE_DIGITAL)
 	     && !is_disgital)
 	    || ((ucontrol->value.integer.value[0] == CTL_ROUTE_ANALOG)
 		&& is_disgital)) {
 		snd_aw2_saa7146_use_digital_input(&chip->saa7146, !is_disgital);
 		changed = 1;
 	}
 	return changed;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*****************************************************************************
	*
	* Copyright (C) 2008 Cedric Bregardis <cedric.bregardis@free.fr> and
	* Jean-Christian Hassler <jhassler@free.fr>
	*
	* This file is part of the Audiowerk2 ALSA driver
	*
	*****************************************************************************/
	#include <linux/init.h>
	#include <linux/pci.h>
	#include <linux/dma-mapping.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/module.h>
	#include <sound/core.h>
	#include <sound/initval.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/control.h>

	#include "saa7146.h"
	#include "aw2-saa7146.h"

	MODULE_AUTHOR("Cedric Bregardis <cedric.bregardis@free.fr>, "
	"Jean-Christian Hassler <jhassler@free.fr>");
	MODULE_DESCRIPTION("Emagic Audiowerk 2 sound driver");
	MODULE_LICENSE("GPL");

	/*********************************
	* DEFINES
	********************************/
	#define CTL_ROUTE_ANALOG 0
	#define CTL_ROUTE_DIGITAL 1

	/*********************************
	* TYPEDEFS
	********************************/
	/* hardware definition */
	static const struct snd_pcm_hardware snd_aw2_playback_hw = {
	.info = (SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \| SNDRV_PCM_INFO_MMAP_VALID),
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_44100,
	.rate_min = 44100,
	.rate_max = 44100,
	.channels_min = 2,
	.channels_max = 4,
	.buffer_bytes_max = 32768,
	.period_bytes_min = 4096,
	.period_bytes_max = 32768,
	.periods_min = 1,
	.periods_max = 1024,
	};

	static const struct snd_pcm_hardware snd_aw2_capture_hw = {
	.info = (SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \| SNDRV_PCM_INFO_MMAP_VALID),
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_44100,
	.rate_min = 44100,
	.rate_max = 44100,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = 32768,
	.period_bytes_min = 4096,
	.period_bytes_max = 32768,
	.periods_min = 1,
	.periods_max = 1024,
	};

	struct aw2_pcm_device {
	struct snd_pcm *pcm;
	unsigned int stream_number;
	struct aw2 *chip;
	};

	struct aw2 {
	struct snd_aw2_saa7146 saa7146;

	struct pci_dev *pci;
	int irq;
	spinlock_t reg_lock;
	struct mutex mtx;

	unsigned long iobase_phys;
	void __iomem *iobase_virt;

	struct snd_card *card;

	struct aw2_pcm_device device_playback[NB_STREAM_PLAYBACK];
	struct aw2_pcm_device device_capture[NB_STREAM_CAPTURE];
	};

	/*********************************
	* FUNCTION DECLARATIONS
	********************************/
	static int snd_aw2_dev_free(struct snd_device *device);
	static int snd_aw2_create(struct snd_card *card,
	struct pci_dev pci, struct aw2 *rchip);
	static int snd_aw2_probe(struct pci_dev *pci,
	const struct pci_device_id *pci_id);
	static void snd_aw2_remove(struct pci_dev *pci);
	static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream);
	static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream);
	static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream);
	static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream);
	static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream);
	static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream);
	static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
	int cmd);
	static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
	int cmd);
	static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
	*substream);
	static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
	*substream);
	static int snd_aw2_new_pcm(struct aw2 *chip);

	static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *uinfo);
	static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value
	*ucontrol);
	static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value
	*ucontrol);

	/*********************************
	* VARIABLES
	********************************/
	static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
	static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
	static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

	module_param_array(index, int, NULL, 0444);
	MODULE_PARM_DESC(index, "Index value for Audiowerk2 soundcard.");
	module_param_array(id, charp, NULL, 0444);
	MODULE_PARM_DESC(id, "ID string for the Audiowerk2 soundcard.");
	module_param_array(enable, bool, NULL, 0444);
	MODULE_PARM_DESC(enable, "Enable Audiowerk2 soundcard.");

	static const struct pci_device_id snd_aw2_ids[] = {
	{PCI_VENDOR_ID_PHILIPS, PCI_DEVICE_ID_PHILIPS_SAA7146, 0, 0,
	0, 0, 0},
	{0}
	};

	MODULE_DEVICE_TABLE(pci, snd_aw2_ids);

	/* pci_driver definition */
	static struct pci_driver aw2_driver = {
	.name = KBUILD_MODNAME,
	.id_table = snd_aw2_ids,
	.probe = snd_aw2_probe,
	.remove = snd_aw2_remove,
	};

	module_pci_driver(aw2_driver);

	/* operators for playback PCM alsa interface */
	static const struct snd_pcm_ops snd_aw2_playback_ops = {
	.open = snd_aw2_pcm_playback_open,
	.close = snd_aw2_pcm_playback_close,
	.prepare = snd_aw2_pcm_prepare_playback,
	.trigger = snd_aw2_pcm_trigger_playback,
	.pointer = snd_aw2_pcm_pointer_playback,
	};

	/* operators for capture PCM alsa interface */
	static const struct snd_pcm_ops snd_aw2_capture_ops = {
	.open = snd_aw2_pcm_capture_open,
	.close = snd_aw2_pcm_capture_close,
	.prepare = snd_aw2_pcm_prepare_capture,
	.trigger = snd_aw2_pcm_trigger_capture,
	.pointer = snd_aw2_pcm_pointer_capture,
	};

	static const struct snd_kcontrol_new aw2_control = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "PCM Capture Route",
	.index = 0,
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.private_value = 0xffff,
	.info = snd_aw2_control_switch_capture_info,
	.get = snd_aw2_control_switch_capture_get,
	.put = snd_aw2_control_switch_capture_put
	};

	/*********************************
	* FUNCTION IMPLEMENTATIONS
	********************************/

	/* component-destructor */
	static int snd_aw2_dev_free(struct snd_device *device)
	{
	struct aw2 *chip = device->device_data;

	/* Free hardware */
	snd_aw2_saa7146_free(&chip->saa7146);

	/* release the irq */
	if (chip->irq >= 0)
	free_irq(chip->irq, (void *)chip);
	/* release the i/o ports & memory */
	iounmap(chip->iobase_virt);
	pci_release_regions(chip->pci);
	/* disable the PCI entry */
	pci_disable_device(chip->pci);
	/* release the data */
	kfree(chip);

	return 0;
	}

	/* chip-specific constructor */
	static int snd_aw2_create(struct snd_card *card,
	struct pci_dev pci, struct aw2 *rchip)
	{
	struct aw2 *chip;
	int err;
	static const struct snd_device_ops ops = {
	.dev_free = snd_aw2_dev_free,
	};

	*rchip = NULL;

	/* initialize the PCI entry */
	err = pci_enable_device(pci);
	if (err < 0)
	return err;
	pci_set_master(pci);

	/* check PCI availability (32bit DMA) */
	if ((dma_set_mask(&pci->dev, DMA_BIT_MASK(32)) < 0) \|\|
	(dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(32)) < 0)) {
	dev_err(card->dev, "Impossible to set 32bit mask DMA\n");
	pci_disable_device(pci);
	return -ENXIO;
	}
	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL) {
	pci_disable_device(pci);
	return -ENOMEM;
	}

	/* initialize the stuff */
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;

	/* (1) PCI resource allocation */
	err = pci_request_regions(pci, "Audiowerk2");
	if (err < 0) {
	pci_disable_device(pci);
	kfree(chip);
	return err;
	}
	chip->iobase_phys = pci_resource_start(pci, 0);
	chip->iobase_virt =
	ioremap(chip->iobase_phys,
	pci_resource_len(pci, 0));

	if (chip->iobase_virt == NULL) {
	dev_err(card->dev, "unable to remap memory region");
	pci_release_regions(pci);
	pci_disable_device(pci);
	kfree(chip);
	return -ENOMEM;
	}

	/* (2) initialization of the chip hardware */
	snd_aw2_saa7146_setup(&chip->saa7146, chip->iobase_virt);

	if (request_irq(pci->irq, snd_aw2_saa7146_interrupt,
	IRQF_SHARED, KBUILD_MODNAME, chip)) {
	dev_err(card->dev, "Cannot grab irq %d\n", pci->irq);

	iounmap(chip->iobase_virt);
	pci_release_regions(chip->pci);
	pci_disable_device(chip->pci);
	kfree(chip);
	return -EBUSY;
	}
	chip->irq = pci->irq;
	card->sync_irq = chip->irq;

	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0) {
	free_irq(chip->irq, (void *)chip);
	iounmap(chip->iobase_virt);
	pci_release_regions(chip->pci);
	pci_disable_device(chip->pci);
	kfree(chip);
	return err;
	}

	*rchip = chip;

	dev_info(card->dev,
	"Audiowerk 2 sound card (saa7146 chipset) detected and managed\n");
	return 0;
	}

	/* constructor */
	static int snd_aw2_probe(struct pci_dev *pci,
	const struct pci_device_id *pci_id)
	{
	static int dev;
	struct snd_card *card;
	struct aw2 *chip;
	int err;

	/* (1) Continue if device is not enabled, else inc dev */
	if (dev >= SNDRV_CARDS)
	return -ENODEV;
	if (!enable[dev]) {
	dev++;
	return -ENOENT;
	}

	/* (2) Create card instance */
	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
	0, &card);
	if (err < 0)
	return err;

	/* (3) Create main component */
	err = snd_aw2_create(card, pci, &chip);
	if (err < 0) {
	snd_card_free(card);
	return err;
	}

	/* initialize mutex */
	mutex_init(&chip->mtx);
	/* init spinlock */
	spin_lock_init(&chip->reg_lock);
	/* (4) Define driver ID and name string */
	strcpy(card->driver, "aw2");
	strcpy(card->shortname, "Audiowerk2");

	sprintf(card->longname, "%s with SAA7146 irq %i",
	card->shortname, chip->irq);

	/* (5) Create other components */
	snd_aw2_new_pcm(chip);

	/* (6) Register card instance */
	err = snd_card_register(card);
	if (err < 0) {
	snd_card_free(card);
	return err;
	}

	/* (7) Set PCI driver data */
	pci_set_drvdata(pci, card);

	dev++;
	return 0;
	}

	/* destructor */
	static void snd_aw2_remove(struct pci_dev *pci)
	{
	snd_card_free(pci_get_drvdata(pci));
	}

	/* open callback */
	static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;

	dev_dbg(substream->pcm->card->dev, "Playback_open\n");
	runtime->hw = snd_aw2_playback_hw;
	return 0;
	}

	/* close callback */
	static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream)
	{
	return 0;

	}

	static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;

	dev_dbg(substream->pcm->card->dev, "Capture_open\n");
	runtime->hw = snd_aw2_capture_hw;
	return 0;
	}

	/* close callback */
	static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream)
	{
	/* TODO: something to do ? */
	return 0;
	}

	/* prepare callback for playback */
	static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream)
	{
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long period_size, buffer_size;

	mutex_lock(&chip->mtx);

	period_size = snd_pcm_lib_period_bytes(substream);
	buffer_size = snd_pcm_lib_buffer_bytes(substream);

	snd_aw2_saa7146_pcm_init_playback(&chip->saa7146,
	pcm_device->stream_number,
	runtime->dma_addr, period_size,
	buffer_size);

	/* Define Interrupt callback */
	snd_aw2_saa7146_define_it_playback_callback(pcm_device->stream_number,
	(snd_aw2_saa7146_it_cb)
	snd_pcm_period_elapsed,
	(void *)substream);

	mutex_unlock(&chip->mtx);

	return 0;
	}

	/* prepare callback for capture */
	static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream)
	{
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long period_size, buffer_size;

	mutex_lock(&chip->mtx);

	period_size = snd_pcm_lib_period_bytes(substream);
	buffer_size = snd_pcm_lib_buffer_bytes(substream);

	snd_aw2_saa7146_pcm_init_capture(&chip->saa7146,
	pcm_device->stream_number,
	runtime->dma_addr, period_size,
	buffer_size);

	/* Define Interrupt callback */
	snd_aw2_saa7146_define_it_capture_callback(pcm_device->stream_number,
	(snd_aw2_saa7146_it_cb)
	snd_pcm_period_elapsed,
	(void *)substream);

	mutex_unlock(&chip->mtx);

	return 0;
	}

	/* playback trigger callback */
	static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
	int cmd)
	{
	int status = 0;
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	spin_lock(&chip->reg_lock);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	snd_aw2_saa7146_pcm_trigger_start_playback(&chip->saa7146,
	pcm_device->
	stream_number);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	snd_aw2_saa7146_pcm_trigger_stop_playback(&chip->saa7146,
	pcm_device->
	stream_number);
	break;
	default:
	status = -EINVAL;
	}
	spin_unlock(&chip->reg_lock);
	return status;
	}

	/* capture trigger callback */
	static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
	int cmd)
	{
	int status = 0;
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	spin_lock(&chip->reg_lock);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	snd_aw2_saa7146_pcm_trigger_start_capture(&chip->saa7146,
	pcm_device->
	stream_number);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	snd_aw2_saa7146_pcm_trigger_stop_capture(&chip->saa7146,
	pcm_device->
	stream_number);
	break;
	default:
	status = -EINVAL;
	}
	spin_unlock(&chip->reg_lock);
	return status;
	}

	/* playback pointer callback */
	static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
	*substream)
	{
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	unsigned int current_ptr;

	/* get the current hardware pointer */
	struct snd_pcm_runtime *runtime = substream->runtime;
	current_ptr =
	snd_aw2_saa7146_get_hw_ptr_playback(&chip->saa7146,
	pcm_device->stream_number,
	runtime->dma_area,
	runtime->buffer_size);

	return bytes_to_frames(substream->runtime, current_ptr);
	}

	/* capture pointer callback */
	static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
	*substream)
	{
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	unsigned int current_ptr;

	/* get the current hardware pointer */
	struct snd_pcm_runtime *runtime = substream->runtime;
	current_ptr =
	snd_aw2_saa7146_get_hw_ptr_capture(&chip->saa7146,
	pcm_device->stream_number,
	runtime->dma_area,
	runtime->buffer_size);

	return bytes_to_frames(substream->runtime, current_ptr);
	}

	/* create a pcm device */
	static int snd_aw2_new_pcm(struct aw2 *chip)
	{
	struct snd_pcm *pcm_playback_ana;
	struct snd_pcm *pcm_playback_num;
	struct snd_pcm *pcm_capture;
	struct aw2_pcm_device *pcm_device;
	int err = 0;

	/* Create new Alsa PCM device */

	err = snd_pcm_new(chip->card, "Audiowerk2 analog playback", 0, 1, 0,
	&pcm_playback_ana);
	if (err < 0) {
	dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
	return err;
	}

	/* Creation ok */
	pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_ANA];

	/* Set PCM device name */
	strcpy(pcm_playback_ana->name, "Analog playback");
	/* Associate private data to PCM device */
	pcm_playback_ana->private_data = pcm_device;
	/* set operators of PCM device */
	snd_pcm_set_ops(pcm_playback_ana, SNDRV_PCM_STREAM_PLAYBACK,
	&snd_aw2_playback_ops);
	/* store PCM device */
	pcm_device->pcm = pcm_playback_ana;
	/* give base chip pointer to our internal pcm device
	structure */
	pcm_device->chip = chip;
	/* Give stream number to PCM device */
	pcm_device->stream_number = NUM_STREAM_PLAYBACK_ANA;

	/* pre-allocation of buffers */
	/* Preallocate continuous pages. */
	snd_pcm_set_managed_buffer_all(pcm_playback_ana,
	SNDRV_DMA_TYPE_DEV,
	&chip->pci->dev,
	64 * 1024, 64 * 1024);

	err = snd_pcm_new(chip->card, "Audiowerk2 digital playback", 1, 1, 0,
	&pcm_playback_num);

	if (err < 0) {
	dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
	return err;
	}
	/* Creation ok */
	pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_DIG];

	/* Set PCM device name */
	strcpy(pcm_playback_num->name, "Digital playback");
	/* Associate private data to PCM device */
	pcm_playback_num->private_data = pcm_device;
	/* set operators of PCM device */
	snd_pcm_set_ops(pcm_playback_num, SNDRV_PCM_STREAM_PLAYBACK,
	&snd_aw2_playback_ops);
	/* store PCM device */
	pcm_device->pcm = pcm_playback_num;
	/* give base chip pointer to our internal pcm device
	structure */
	pcm_device->chip = chip;
	/* Give stream number to PCM device */
	pcm_device->stream_number = NUM_STREAM_PLAYBACK_DIG;

	/* pre-allocation of buffers */
	/* Preallocate continuous pages. */
	snd_pcm_set_managed_buffer_all(pcm_playback_num,
	SNDRV_DMA_TYPE_DEV,
	&chip->pci->dev,
	64 * 1024, 64 * 1024);

	err = snd_pcm_new(chip->card, "Audiowerk2 capture", 2, 0, 1,
	&pcm_capture);

	if (err < 0) {
	dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
	return err;
	}

	/* Creation ok */
	pcm_device = &chip->device_capture[NUM_STREAM_CAPTURE_ANA];

	/* Set PCM device name */
	strcpy(pcm_capture->name, "Capture");
	/* Associate private data to PCM device */
	pcm_capture->private_data = pcm_device;
	/* set operators of PCM device */
	snd_pcm_set_ops(pcm_capture, SNDRV_PCM_STREAM_CAPTURE,
	&snd_aw2_capture_ops);
	/* store PCM device */
	pcm_device->pcm = pcm_capture;
	/* give base chip pointer to our internal pcm device
	structure */
	pcm_device->chip = chip;
	/* Give stream number to PCM device */
	pcm_device->stream_number = NUM_STREAM_CAPTURE_ANA;

	/* pre-allocation of buffers */
	/* Preallocate continuous pages. */
	snd_pcm_set_managed_buffer_all(pcm_capture,
	SNDRV_DMA_TYPE_DEV,
	&chip->pci->dev,
	64 * 1024, 64 * 1024);

	/* Create control */
	err = snd_ctl_add(chip->card, snd_ctl_new1(&aw2_control, chip));
	if (err < 0) {
	dev_err(chip->card->dev, "snd_ctl_add error (0x%X)\n", err);
	return err;
	}

	return 0;
	}

	static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *uinfo)
	{
	static const char * const texts[2] = {
	"Analog", "Digital"
	};
	return snd_ctl_enum_info(uinfo, 1, 2, texts);
	}

	static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value
	*ucontrol)
	{
	struct aw2 *chip = snd_kcontrol_chip(kcontrol);
	if (snd_aw2_saa7146_is_using_digital_input(&chip->saa7146))
	ucontrol->value.enumerated.item[0] = CTL_ROUTE_DIGITAL;
	else
	ucontrol->value.enumerated.item[0] = CTL_ROUTE_ANALOG;
	return 0;
	}

	static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value
	*ucontrol)
	{
	struct aw2 *chip = snd_kcontrol_chip(kcontrol);
	int changed = 0;
	int is_disgital =
	snd_aw2_saa7146_is_using_digital_input(&chip->saa7146);

	if (((ucontrol->value.integer.value[0] == CTL_ROUTE_DIGITAL)
	&& !is_disgital)
	\|\| ((ucontrol->value.integer.value[0] == CTL_ROUTE_ANALOG)
	&& is_disgital)) {
	snd_aw2_saa7146_use_digital_input(&chip->saa7146, !is_disgital);
	changed = 1;
	}
	return changed;
	}