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ak4117.c

/*
 *  Routines for control of the AK4117 via 4-wire serial interface
 *  IEC958 (S/PDIF) receiver by Asahi Kasei
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *
 *
 *   This program 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; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/ak4117.h>
#include <sound/asoundef.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("AK4117 IEC958 (S/PDIF) receiver by Asahi Kasei");
MODULE_LICENSE("GPL");

#define AK4117_ADDR                 0x00 /* fixed address */

static void snd_ak4117_timer(unsigned long data);

static void reg_write(ak4117_t *ak4117, unsigned char reg, unsigned char val)
{
      ak4117->write(ak4117->private_data, reg, val);
      if (reg < sizeof(ak4117->regmap))
            ak4117->regmap[reg] = val;
}

static inline unsigned char reg_read(ak4117_t *ak4117, unsigned char reg)
{
      return ak4117->read(ak4117->private_data, reg);
}

#if 0
static void reg_dump(ak4117_t *ak4117)
{
      int i;

      printk(KERN_DEBUG "AK4117 REG DUMP:\n");
      for (i = 0; i < 0x1b; i++)
            printk(KERN_DEBUG "reg[%02x] = %02x (%02x)\n", i, reg_read(ak4117, i), i < sizeof(ak4117->regmap) ? ak4117->regmap[i] : 0);
}
#endif

static void snd_ak4117_free(ak4117_t *chip)
{
      del_timer(&chip->timer);
      kfree(chip);
}

static int snd_ak4117_dev_free(snd_device_t *device)
{
      ak4117_t *chip = device->device_data;
      snd_ak4117_free(chip);
      return 0;
}

int snd_ak4117_create(snd_card_t *card, ak4117_read_t *read, ak4117_write_t *write,
                  unsigned char pgm[5], void *private_data, ak4117_t **r_ak4117)
{
      ak4117_t *chip;
      int err = 0;
      unsigned char reg;
      static snd_device_ops_t ops = {
            .dev_free =     snd_ak4117_dev_free,
      };

      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (chip == NULL)
            return -ENOMEM;
      spin_lock_init(&chip->lock);
      chip->card = card;
      chip->read = read;
      chip->write = write;
      chip->private_data = private_data;
      init_timer(&chip->timer);
      chip->timer.data = (unsigned long)chip;
      chip->timer.function = snd_ak4117_timer;

      for (reg = 0; reg < 5; reg++)
            chip->regmap[reg] = pgm[reg];
      snd_ak4117_reinit(chip);

      chip->rcs0 = reg_read(chip, AK4117_REG_RCS0) & ~(AK4117_QINT | AK4117_CINT | AK4117_STC);
      chip->rcs1 = reg_read(chip, AK4117_REG_RCS1);
      chip->rcs2 = reg_read(chip, AK4117_REG_RCS2);

      if ((err = snd_device_new(card, SNDRV_DEV_CODEC, chip, &ops)) < 0)
            goto __fail;

      if (r_ak4117)
            *r_ak4117 = chip;
      return 0;

      __fail:
      snd_ak4117_free(chip);
      return err < 0 ? err : -EIO;
}

void snd_ak4117_reg_write(ak4117_t *chip, unsigned char reg, unsigned char mask, unsigned char val)
{
      if (reg >= 5)
            return;
      reg_write(chip, reg, (chip->regmap[reg] & ~mask) | val);
}

void snd_ak4117_reinit(ak4117_t *chip)
{
      unsigned char old = chip->regmap[AK4117_REG_PWRDN], reg;

      del_timer(&chip->timer);
      chip->init = 1;
      /* bring the chip to reset state and powerdown state */
      reg_write(chip, AK4117_REG_PWRDN, 0);
      udelay(200);
      /* release reset, but leave powerdown */
      reg_write(chip, AK4117_REG_PWRDN, (old | AK4117_RST) & ~AK4117_PWN);
      udelay(200);
      for (reg = 1; reg < 5; reg++)
            reg_write(chip, reg, chip->regmap[reg]);
      /* release powerdown, everything is initialized now */
      reg_write(chip, AK4117_REG_PWRDN, old | AK4117_RST | AK4117_PWN);
      chip->init = 0;
      chip->timer.expires = 1 + jiffies;
      add_timer(&chip->timer);
}

static unsigned int external_rate(unsigned char rcs1)
{
      switch (rcs1 & (AK4117_FS0|AK4117_FS1|AK4117_FS2|AK4117_FS3)) {
      case AK4117_FS_32000HZ: return 32000;
      case AK4117_FS_44100HZ: return 44100;
      case AK4117_FS_48000HZ: return 48000;
      case AK4117_FS_88200HZ: return 88200;
      case AK4117_FS_96000HZ: return 96000;
      case AK4117_FS_176400HZ: return 176400;
      case AK4117_FS_192000HZ: return 192000;
      default:          return 0;
      }
}

static int snd_ak4117_in_error_info(snd_kcontrol_t *kcontrol,
                            snd_ctl_elem_info_t *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = LONG_MAX;
      return 0;
}

static int snd_ak4117_in_error_get(snd_kcontrol_t *kcontrol,
                           snd_ctl_elem_value_t *ucontrol)
{
      ak4117_t *chip = snd_kcontrol_chip(kcontrol);
      long *ptr;

      spin_lock_irq(&chip->lock);
      ptr = (long *)(((char *)chip) + kcontrol->private_value);
      ucontrol->value.integer.value[0] = *ptr;
      *ptr = 0;
      spin_unlock_irq(&chip->lock);
      return 0;
}

static int snd_ak4117_in_bit_info(snd_kcontrol_t *kcontrol,
                          snd_ctl_elem_info_t *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int snd_ak4117_in_bit_get(snd_kcontrol_t *kcontrol,
                         snd_ctl_elem_value_t *ucontrol)
{
      ak4117_t *chip = snd_kcontrol_chip(kcontrol);
      unsigned char reg = kcontrol->private_value & 0xff;
      unsigned char bit = (kcontrol->private_value >> 8) & 0xff;
      unsigned char inv = (kcontrol->private_value >> 31) & 1;

      ucontrol->value.integer.value[0] = ((reg_read(chip, reg) & (1 << bit)) ? 1 : 0) ^ inv;
      return 0;
}

static int snd_ak4117_rx_info(snd_kcontrol_t *kcontrol,
                        snd_ctl_elem_info_t *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int snd_ak4117_rx_get(snd_kcontrol_t *kcontrol,
                       snd_ctl_elem_value_t *ucontrol)
{
      ak4117_t *chip = snd_kcontrol_chip(kcontrol);

      ucontrol->value.integer.value[0] = (chip->regmap[AK4117_REG_IO] & AK4117_IPS) ? 1 : 0;
      return 0;
}

static int snd_ak4117_rx_put(snd_kcontrol_t *kcontrol,
                       snd_ctl_elem_value_t *ucontrol)
{
      ak4117_t *chip = snd_kcontrol_chip(kcontrol);
      int change;
      u8 old_val;
      
      spin_lock_irq(&chip->lock);
      old_val = chip->regmap[AK4117_REG_IO];
      change = !!ucontrol->value.integer.value[0] != ((old_val & AK4117_IPS) ? 1 : 0);
      if (change)
            reg_write(chip, AK4117_REG_IO, (old_val & ~AK4117_IPS) | (ucontrol->value.integer.value[0] ? AK4117_IPS : 0));
      spin_unlock_irq(&chip->lock);
      return change;
}

static int snd_ak4117_rate_info(snd_kcontrol_t *kcontrol,
                        snd_ctl_elem_info_t *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 192000;
      return 0;
}

static int snd_ak4117_rate_get(snd_kcontrol_t *kcontrol,
                         snd_ctl_elem_value_t *ucontrol)
{
      ak4117_t *chip = snd_kcontrol_chip(kcontrol);

      ucontrol->value.integer.value[0] = external_rate(reg_read(chip, AK4117_REG_RCS1));
      return 0;
}

static int snd_ak4117_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
      uinfo->count = 1;
      return 0;
}

static int snd_ak4117_spdif_get(snd_kcontrol_t * kcontrol,
                        snd_ctl_elem_value_t * ucontrol)
{
      ak4117_t *chip = snd_kcontrol_chip(kcontrol);
      unsigned i;

      for (i = 0; i < AK4117_REG_RXCSB_SIZE; i++)
            ucontrol->value.iec958.status[i] = reg_read(chip, AK4117_REG_RXCSB0 + i);
      return 0;
}

static int snd_ak4117_spdif_mask_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
      uinfo->count = 1;
      return 0;
}

static int snd_ak4117_spdif_mask_get(snd_kcontrol_t * kcontrol,
                              snd_ctl_elem_value_t * ucontrol)
{
      memset(ucontrol->value.iec958.status, 0xff, AK4117_REG_RXCSB_SIZE);
      return 0;
}

static int snd_ak4117_spdif_pinfo(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 0xffff;
      uinfo->count = 4;
      return 0;
}

static int snd_ak4117_spdif_pget(snd_kcontrol_t * kcontrol,
                         snd_ctl_elem_value_t * ucontrol)
{
      ak4117_t *chip = snd_kcontrol_chip(kcontrol);
      unsigned short tmp;

      ucontrol->value.integer.value[0] = 0xf8f2;
      ucontrol->value.integer.value[1] = 0x4e1f;
      tmp = reg_read(chip, AK4117_REG_Pc0) | (reg_read(chip, AK4117_REG_Pc1) << 8);
      ucontrol->value.integer.value[2] = tmp;
      tmp = reg_read(chip, AK4117_REG_Pd0) | (reg_read(chip, AK4117_REG_Pd1) << 8);
      ucontrol->value.integer.value[3] = tmp;
      return 0;
}

static int snd_ak4117_spdif_qinfo(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
      uinfo->count = AK4117_REG_QSUB_SIZE;
      return 0;
}

static int snd_ak4117_spdif_qget(snd_kcontrol_t * kcontrol,
                         snd_ctl_elem_value_t * ucontrol)
{
      ak4117_t *chip = snd_kcontrol_chip(kcontrol);
      unsigned i;

      for (i = 0; i < AK4117_REG_QSUB_SIZE; i++)
            ucontrol->value.bytes.data[i] = reg_read(chip, AK4117_REG_QSUB_ADDR + i);
      return 0;
}

/* Don't forget to change AK4117_CONTROLS define!!! */
static snd_kcontrol_new_t snd_ak4117_iec958_controls[] = {
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 Parity Errors",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_in_error_info,
      .get =            snd_ak4117_in_error_get,
      .private_value = offsetof(ak4117_t, parity_errors),
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 V-Bit Errors",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_in_error_info,
      .get =            snd_ak4117_in_error_get,
      .private_value = offsetof(ak4117_t, v_bit_errors),
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 C-CRC Errors",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_in_error_info,
      .get =            snd_ak4117_in_error_get,
      .private_value = offsetof(ak4117_t, ccrc_errors),
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 Q-CRC Errors",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_in_error_info,
      .get =            snd_ak4117_in_error_get,
      .private_value = offsetof(ak4117_t, qcrc_errors),
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 External Rate",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_rate_info,
      .get =            snd_ak4117_rate_get,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           SNDRV_CTL_NAME_IEC958("",CAPTURE,MASK),
      .access =   SNDRV_CTL_ELEM_ACCESS_READ,
      .info =           snd_ak4117_spdif_mask_info,
      .get =            snd_ak4117_spdif_mask_get,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           SNDRV_CTL_NAME_IEC958("",CAPTURE,DEFAULT),
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_spdif_info,
      .get =            snd_ak4117_spdif_get,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 Preample Capture Default",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_spdif_pinfo,
      .get =            snd_ak4117_spdif_pget,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 Q-subcode Capture Default",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_spdif_qinfo,
      .get =            snd_ak4117_spdif_qget,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 Audio",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_in_bit_info,
      .get =            snd_ak4117_in_bit_get,
      .private_value = (1<<31) | (3<<8) | AK4117_REG_RCS0,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 Non-PCM Bitstream",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_in_bit_info,
      .get =            snd_ak4117_in_bit_get,
      .private_value = (5<<8) | AK4117_REG_RCS1,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "IEC958 DTS Bitstream",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
      .info =           snd_ak4117_in_bit_info,
      .get =            snd_ak4117_in_bit_get,
      .private_value = (6<<8) | AK4117_REG_RCS1,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           "AK4117 Input Select",
      .access =   SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_WRITE,
      .info =           snd_ak4117_rx_info,
      .get =            snd_ak4117_rx_get,
      .put =            snd_ak4117_rx_put,
}
};

int snd_ak4117_build(ak4117_t *ak4117, snd_pcm_substream_t *cap_substream)
{
      snd_kcontrol_t *kctl;
      unsigned int idx;
      int err;

      snd_assert(cap_substream, return -EINVAL);
      ak4117->substream = cap_substream;
      for (idx = 0; idx < AK4117_CONTROLS; idx++) {
            kctl = snd_ctl_new1(&snd_ak4117_iec958_controls[idx], ak4117);
            if (kctl == NULL)
                  return -ENOMEM;
            kctl->id.device = cap_substream->pcm->device;
            kctl->id.subdevice = cap_substream->number;
            err = snd_ctl_add(ak4117->card, kctl);
            if (err < 0)
                  return err;
            ak4117->kctls[idx] = kctl;
      }
      return 0;
}

int snd_ak4117_external_rate(ak4117_t *ak4117)
{
      unsigned char rcs1;

      rcs1 = reg_read(ak4117, AK4117_REG_RCS1);
      return external_rate(rcs1);
}

int snd_ak4117_check_rate_and_errors(ak4117_t *ak4117, unsigned int flags)
{
      snd_pcm_runtime_t *runtime = ak4117->substream ? ak4117->substream->runtime : NULL;
      unsigned long _flags;
      int res = 0;
      unsigned char rcs0, rcs1, rcs2;
      unsigned char c0, c1;

      rcs1 = reg_read(ak4117, AK4117_REG_RCS1);
      if (flags & AK4117_CHECK_NO_STAT)
            goto __rate;
      rcs0 = reg_read(ak4117, AK4117_REG_RCS0);
      rcs2 = reg_read(ak4117, AK4117_REG_RCS2);
      // printk(KERN_DEBUG "AK IRQ: rcs0 = 0x%x, rcs1 = 0x%x, rcs2 = 0x%x\n", rcs0, rcs1, rcs2);
      spin_lock_irqsave(&ak4117->lock, _flags);
      if (rcs0 & AK4117_PAR)
            ak4117->parity_errors++;
      if (rcs0 & AK4117_V)
            ak4117->v_bit_errors++;
      if (rcs2 & AK4117_CCRC)
            ak4117->ccrc_errors++;
      if (rcs2 & AK4117_QCRC)
            ak4117->qcrc_errors++;
      c0 = (ak4117->rcs0 & (AK4117_QINT | AK4117_CINT | AK4117_STC | AK4117_AUDION | AK4117_AUTO | AK4117_UNLCK)) ^
                     (rcs0 & (AK4117_QINT | AK4117_CINT | AK4117_STC | AK4117_AUDION | AK4117_AUTO | AK4117_UNLCK));
      c1 = (ak4117->rcs1 & (AK4117_DTSCD | AK4117_NPCM | AK4117_PEM | 0x0f)) ^
                   (rcs1 & (AK4117_DTSCD | AK4117_NPCM | AK4117_PEM | 0x0f));
      ak4117->rcs0 = rcs0 & ~(AK4117_QINT | AK4117_CINT | AK4117_STC);
      ak4117->rcs1 = rcs1;
      ak4117->rcs2 = rcs2;
      spin_unlock_irqrestore(&ak4117->lock, _flags);

      if (rcs0 & AK4117_PAR)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[0]->id);
      if (rcs0 & AK4117_V)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[1]->id);
      if (rcs2 & AK4117_CCRC)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[2]->id);
      if (rcs2 & AK4117_QCRC)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[3]->id);

      /* rate change */
      if (c1 & 0x0f)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[4]->id);

      if ((c1 & AK4117_PEM) | (c0 & AK4117_CINT))
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[6]->id);
      if (c0 & AK4117_QINT)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[8]->id);

      if (c0 & AK4117_AUDION)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[9]->id);
      if (c1 & AK4117_NPCM)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[10]->id);
      if (c1 & AK4117_DTSCD)
            snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[11]->id);
            
      if (ak4117->change_callback && (c0 | c1) != 0)
            ak4117->change_callback(ak4117, c0, c1);

      __rate:
      /* compare rate */
      res = external_rate(rcs1);
      if (!(flags & AK4117_CHECK_NO_RATE) && runtime && runtime->rate != res) {
            snd_pcm_stream_lock_irqsave(ak4117->substream, _flags);
            if (snd_pcm_running(ak4117->substream)) {
                  // printk(KERN_DEBUG "rate changed (%i <- %i)\n", runtime->rate, res);
                  snd_pcm_stop(ak4117->substream, SNDRV_PCM_STATE_DRAINING);
                  wake_up(&runtime->sleep);
                  res = 1;
            }
            snd_pcm_stream_unlock_irqrestore(ak4117->substream, _flags);
      }
      return res;
}

static void snd_ak4117_timer(unsigned long data)
{
      ak4117_t *chip = (ak4117_t *)data;

      if (chip->init)
            return;
      snd_ak4117_check_rate_and_errors(chip, 0);
      chip->timer.expires = 1 + jiffies;
      add_timer(&chip->timer);
}

EXPORT_SYMBOL(snd_ak4117_create);
EXPORT_SYMBOL(snd_ak4117_reg_write);
EXPORT_SYMBOL(snd_ak4117_reinit);
EXPORT_SYMBOL(snd_ak4117_build);
EXPORT_SYMBOL(snd_ak4117_external_rate);
EXPORT_SYMBOL(snd_ak4117_check_rate_and_errors);

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