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aw2-alsa.c

/*****************************************************************************
 *
 * 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
 *
 * The Audiowerk2 ALSA driver is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.
 *
 * The Audiowerk2 ALSA driver is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Audiowerk2 ALSA driver; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 *****************************************************************************/
#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 <asm/io.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 PCI_VENDOR_ID_SAA7146         0x1131
#define PCI_DEVICE_ID_SAA7146         0x7146

#define CTL_ROUTE_ANALOG 0
#define CTL_ROUTE_DIGITAL 1

/*********************************
 * TYPEDEFS
 ********************************/
  /* hardware definition */
static 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 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 __init alsa_card_aw2_init(void);
static void __exit alsa_card_aw2_exit(void);
static int snd_aw2_dev_free(struct snd_device *device);
static int __devinit snd_aw2_create(struct snd_card *card,
                            struct pci_dev *pci, struct aw2 **rchip);
static int __devinit snd_aw2_probe(struct pci_dev *pci,
                           const struct pci_device_id *pci_id);
static void __devexit 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_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *hw_params);
static int snd_aw2_pcm_hw_free(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 __devinit 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 int 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 struct pci_device_id snd_aw2_ids[] = {
      {PCI_VENDOR_ID_SAA7146, PCI_DEVICE_ID_SAA7146, 0, 0,
       0, 0, 0},
      {0}
};

MODULE_DEVICE_TABLE(pci, snd_aw2_ids);

/* pci_driver definition */
static struct pci_driver driver = {
      .name = "Emagic Audiowerk 2",
      .id_table = snd_aw2_ids,
      .probe = snd_aw2_probe,
      .remove = __devexit_p(snd_aw2_remove),
};

/* operators for playback PCM alsa interface */
static struct snd_pcm_ops snd_aw2_playback_ops = {
      .open = snd_aw2_pcm_playback_open,
      .close = snd_aw2_pcm_playback_close,
      .ioctl = snd_pcm_lib_ioctl,
      .hw_params = snd_aw2_pcm_hw_params,
      .hw_free = snd_aw2_pcm_hw_free,
      .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 struct snd_pcm_ops snd_aw2_capture_ops = {
      .open = snd_aw2_pcm_capture_open,
      .close = snd_aw2_pcm_capture_close,
      .ioctl = snd_pcm_lib_ioctl,
      .hw_params = snd_aw2_pcm_hw_params,
      .hw_free = snd_aw2_pcm_hw_free,
      .prepare = snd_aw2_pcm_prepare_capture,
      .trigger = snd_aw2_pcm_trigger_capture,
      .pointer = snd_aw2_pcm_pointer_capture,
};

static struct snd_kcontrol_new aw2_control __devinitdata = {
      .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
 ********************************/

/* initialization of the module */
static int __init alsa_card_aw2_init(void)
{
      snd_printdd(KERN_DEBUG "aw2: Load aw2 module\n");
      return pci_register_driver(&driver);
}

/* clean up the module */
static void __exit alsa_card_aw2_exit(void)
{
      snd_printdd(KERN_DEBUG "aw2: Unload aw2 module\n");
      pci_unregister_driver(&driver);
}

module_init(alsa_card_aw2_init);
module_exit(alsa_card_aw2_exit);

/* 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 */
      if (chip->iobase_virt)
            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 __devinit snd_aw2_create(struct snd_card *card,
                            struct pci_dev *pci, struct aw2 **rchip)
{
      struct aw2 *chip;
      int err;
      static 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 ((pci_set_dma_mask(pci, DMA_BIT_MASK(32)) < 0) ||
          (pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32)) < 0)) {
            printk(KERN_ERR "aw2: 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_nocache(chip->iobase_phys,
                        pci_resource_len(pci, 0));

      if (chip->iobase_virt == NULL) {
            printk(KERN_ERR "aw2: 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, "Audiowerk2", chip)) {
            printk(KERN_ERR "aw2: 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;

      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;
      }

      snd_card_set_dev(card, &pci->dev);
      *rchip = chip;

      printk(KERN_INFO
             "Audiowerk 2 sound card (saa7146 chipset) detected and "
             "managed\n");
      return 0;
}

/* constructor */
static int __devinit 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_create(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 __devexit snd_aw2_remove(struct pci_dev *pci)
{
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
}

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

      snd_printdd(KERN_DEBUG "aw2: 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;

      snd_printdd(KERN_DEBUG "aw2: 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;
}

 /* hw_params callback */
static int snd_aw2_pcm_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *hw_params)
{
      return snd_pcm_lib_malloc_pages(substream,
                              params_buffer_bytes(hw_params));
}

/* hw_free callback */
static int snd_aw2_pcm_hw_free(struct snd_pcm_substream *substream)
{
      return snd_pcm_lib_free_pages(substream);
}

/* 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 __devinit 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) {
            printk(KERN_ERR "aw2: 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. */
      err = snd_pcm_lib_preallocate_pages_for_all(pcm_playback_ana,
                                        SNDRV_DMA_TYPE_DEV,
                                        snd_dma_pci_data
                                        (chip->pci),
                                        64 * 1024, 64 * 1024);
      if (err)
            printk(KERN_ERR "aw2: snd_pcm_lib_preallocate_pages_for_all "
                   "error (0x%X)\n", err);

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

      if (err < 0) {
            printk(KERN_ERR "aw2: 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. */
      err = snd_pcm_lib_preallocate_pages_for_all(pcm_playback_num,
                                        SNDRV_DMA_TYPE_DEV,
                                        snd_dma_pci_data
                                        (chip->pci),
                                        64 * 1024, 64 * 1024);
      if (err)
            printk(KERN_ERR
                   "aw2: snd_pcm_lib_preallocate_pages_for_all error "
                   "(0x%X)\n", err);



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

      if (err < 0) {
            printk(KERN_ERR "aw2: 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. */
      err = snd_pcm_lib_preallocate_pages_for_all(pcm_capture,
                                        SNDRV_DMA_TYPE_DEV,
                                        snd_dma_pci_data
                                        (chip->pci),
                                        64 * 1024, 64 * 1024);
      if (err)
            printk(KERN_ERR
                   "aw2: snd_pcm_lib_preallocate_pages_for_all error "
                   "(0x%X)\n", err);


      /* Create control */
      err = snd_ctl_add(chip->card, snd_ctl_new1(&aw2_control, chip));
      if (err < 0) {
            printk(KERN_ERR "aw2: 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 char *texts[2] = {
            "Analog", "Digital"
      };
      uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
      uinfo->count = 1;
      uinfo->value.enumerated.items = 2;
      if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items) {
            uinfo->value.enumerated.item =
                uinfo->value.enumerated.items - 1;
      }
      strcpy(uinfo->value.enumerated.name,
             texts[uinfo->value.enumerated.item]);
      return 0;
}

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;
}

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