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cs8427.c

/*
 *  Routines for control of the CS8427 via i2c bus
 *  IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic
 *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/cs8427.h>
#include <sound/asoundef.h>

static void snd_cs8427_reset(struct snd_i2c_device *cs8427);

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
MODULE_LICENSE("GPL");

#define CS8427_ADDR                 (0x20>>1) /* fixed address */

struct cs8427_stream {
      struct snd_pcm_substream *substream;
      char hw_status[24];           /* hardware status */
      char def_status[24];          /* default status */
      char pcm_status[24];          /* PCM private status */
      char hw_udata[32];
      struct snd_kcontrol *pcm_ctl;
};

struct cs8427 {
      unsigned char regmap[0x14];   /* map of first 1 + 13 registers */
      unsigned int rate;
      unsigned int reset_timeout;
      struct cs8427_stream playback;
      struct cs8427_stream capture;
};

static unsigned char swapbits(unsigned char val)
{
      int bit;
      unsigned char res = 0;
      for (bit = 0; bit < 8; bit++) {
            res <<= 1;
            res |= val & 1;
            val >>= 1;
      }
      return res;
}

int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,
                   unsigned char val)
{
      int err;
      unsigned char buf[2];

      buf[0] = reg & 0x7f;
      buf[1] = val;
      if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
            snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "
                     "to CS8427 (%i)\n", buf[0], buf[1], err);
            return err < 0 ? err : -EIO;
      }
      return 0;
}

EXPORT_SYMBOL(snd_cs8427_reg_write);

static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)
{
      int err;
      unsigned char buf;

      if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
            snd_printk(KERN_ERR "unable to send register 0x%x byte "
                     "to CS8427\n", reg);
            return err < 0 ? err : -EIO;
      }
      if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
            snd_printk(KERN_ERR "unable to read register 0x%x byte "
                     "from CS8427\n", reg);
            return err < 0 ? err : -EIO;
      }
      return buf;
}

static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)
{
      struct cs8427 *chip = device->private_data;
      int err;

      udata = udata ? CS8427_BSEL : 0;
      if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
            chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
            chip->regmap[CS8427_REG_CSDATABUF] |= udata;
            err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
                                 chip->regmap[CS8427_REG_CSDATABUF]);
            if (err < 0)
                  return err;
      }
      return 0;
}

static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
                            int udata,
                            unsigned char *ndata,
                            int count)
{
      struct cs8427 *chip = device->private_data;
      char *hw_data = udata ?
            chip->playback.hw_udata : chip->playback.hw_status;
      char data[32];
      int err, idx;

      if (!memcmp(hw_data, ndata, count))
            return 0;
      if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
            return err;
      memcpy(hw_data, ndata, count);
      if (udata) {
            memset(data, 0, sizeof(data));
            if (memcmp(hw_data, data, count) == 0) {
                  chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
                  chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |
                        CS8427_EFTUI;
                  err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,
                                       chip->regmap[CS8427_REG_UDATABUF]);
                  return err < 0 ? err : 0;
            }
      }
      data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
      for (idx = 0; idx < count; idx++)
            data[idx + 1] = swapbits(ndata[idx]);
      if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
            return -EIO;
      return 1;
}

static void snd_cs8427_free(struct snd_i2c_device *device)
{
      kfree(device->private_data);
}

int snd_cs8427_create(struct snd_i2c_bus *bus,
                  unsigned char addr,
                  unsigned int reset_timeout,
                  struct snd_i2c_device **r_cs8427)
{
      static unsigned char initvals1[] = {
        CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
        /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,
           TCBL=output */
        CS8427_SWCLK | CS8427_TCBLDIR,
        /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,
           normal stereo operation */
        0x00,
        /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,
           Rx=>serial */
        CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
        /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,
           output time base = OMCK, input time base = recovered input clock,
           recovered input clock source is ILRCK changed to AES3INPUT
           (workaround, see snd_cs8427_reset) */
        CS8427_RXDILRCK,
        /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,
           24-bit, 64*Fsi */
        CS8427_SIDEL | CS8427_SILRPOL,
        /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format
           = I2S, 24-bit, 64*Fsi */
        CS8427_SODEL | CS8427_SOLRPOL,
      };
      static unsigned char initvals2[] = {
        CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
        /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,
           biphase, parity status bits */
        /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/
        0xff, /* set everything */
        /* CS8427_REG_CSDATABUF:
           Registers 32-55 window to CS buffer
           Inhibit D->E transfers from overwriting first 5 bytes of CS data.
           Inhibit D->E transfers (all) of CS data.
           Allow E->F transfer of CS data.
           One byte mode; both A/B channels get same written CB data.
           A channel info is output to chip's EMPH* pin. */
        CS8427_CBMR | CS8427_DETCI,
        /* CS8427_REG_UDATABUF:
           Use internal buffer to transmit User (U) data.
           Chip's U pin is an output.
           Transmit all O's for user data.
           Inhibit D->E transfers.
           Inhibit E->F transfers. */
        CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
      };
      int err;
      struct cs8427 *chip;
      struct snd_i2c_device *device;
      unsigned char buf[24];

      if ((err = snd_i2c_device_create(bus, "CS8427",
                               CS8427_ADDR | (addr & 7),
                               &device)) < 0)
            return err;
      chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (chip == NULL) {
                  snd_i2c_device_free(device);
            return -ENOMEM;
      }
      device->private_free = snd_cs8427_free;
      
      snd_i2c_lock(bus);
      err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
      if (err != CS8427_VER8427A) {
            /* give second chance */
            snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
                     "let me try again...\n", err);
            err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
      }
      if (err != CS8427_VER8427A) {
            snd_i2c_unlock(bus);
            snd_printk(KERN_ERR "unable to find CS8427 signature "
                     "(expected 0x%x, read 0x%x),\n",
                     CS8427_VER8427A, err);
            snd_printk(KERN_ERR "   initialization is not completed\n");
            return -EFAULT;
      }
      /* turn off run bit while making changes to configuration */
      err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
      if (err < 0)
            goto __fail;
      /* send initial values */
      memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
      if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
            err = err < 0 ? err : -EIO;
            goto __fail;
      }
      /* Turn off CS8427 interrupt stuff that is not used in hardware */
      memset(buf, 0, 7);
      /* from address 9 to 15 */
      buf[0] = 9; /* register */
      if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
            goto __fail;
      /* send transfer initialization sequence */
      memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
      if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
            err = err < 0 ? err : -EIO;
            goto __fail;
      }
      /* write default channel status bytes */
      buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
      buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
      buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
      buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
      memset(buf + 4, 0, 24 - 4);
      if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
            goto __fail;
      memcpy(chip->playback.def_status, buf, 24);
      memcpy(chip->playback.pcm_status, buf, 24);
      snd_i2c_unlock(bus);

      /* turn on run bit and rock'n'roll */
      if (reset_timeout < 1)
            reset_timeout = 1;
      chip->reset_timeout = reset_timeout;
      snd_cs8427_reset(device);

#if 0 // it's nice for read tests
      {
      char buf[128];
      int xx;
      buf[0] = 0x81;
      snd_i2c_sendbytes(device, buf, 1);
      snd_i2c_readbytes(device, buf, 127);
      for (xx = 0; xx < 127; xx++)
            printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
      }
#endif
      
      if (r_cs8427)
            *r_cs8427 = device;
      return 0;

      __fail:
            snd_i2c_unlock(bus);
            snd_i2c_device_free(device);
            return err < 0 ? err : -EIO;
}

EXPORT_SYMBOL(snd_cs8427_create);

/*
 * Reset the chip using run bit, also lock PLL using ILRCK and
 * put back AES3INPUT. This workaround is described in latest
 * CS8427 datasheet, otherwise TXDSERIAL will not work.
 */
static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
{
      struct cs8427 *chip;
      unsigned long end_time;
      int data, aes3input = 0;

      snd_assert(cs8427, return);
      chip = cs8427->private_data;
      snd_i2c_lock(cs8427->bus);
      if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
          CS8427_RXDAES3INPUT)  /* AES3 bit is set */
            aes3input = 1;
      chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
      snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
                       chip->regmap[CS8427_REG_CLOCKSOURCE]);
      udelay(200);
      chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
      snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
                       chip->regmap[CS8427_REG_CLOCKSOURCE]);
      udelay(200);
      snd_i2c_unlock(cs8427->bus);
      end_time = jiffies + chip->reset_timeout;
      while (time_after_eq(end_time, jiffies)) {
            snd_i2c_lock(cs8427->bus);
            data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
            snd_i2c_unlock(cs8427->bus);
            if (!(data & CS8427_UNLOCK))
                  break;
            schedule_timeout_uninterruptible(1);
      }
      snd_i2c_lock(cs8427->bus);
      chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
      if (aes3input)
            chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
      snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
                       chip->regmap[CS8427_REG_CLOCKSOURCE]);
      snd_i2c_unlock(cs8427->bus);
}

static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
                             struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 255;
      return 0;
}

static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
                            struct snd_ctl_elem_value *ucontrol)
{
      struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
      int data;

      snd_i2c_lock(device->bus);
      data = snd_cs8427_reg_read(device, kcontrol->private_value);
      snd_i2c_unlock(device->bus);
      if (data < 0)
            return data;
      ucontrol->value.integer.value[0] = data;
      return 0;
}

static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
                            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
      uinfo->count = 10;
      return 0;
}

static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
                           struct snd_ctl_elem_value *ucontrol)
{
      struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
      unsigned char reg = CS8427_REG_QSUBCODE;
      int err;

      snd_i2c_lock(device->bus);
      if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
            snd_printk(KERN_ERR "unable to send register 0x%x byte "
                     "to CS8427\n", reg);
            snd_i2c_unlock(device->bus);
            return err < 0 ? err : -EIO;
      }
      err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
      if (err != 10) {
            snd_printk(KERN_ERR "unable to read Q-subcode bytes "
                     "from CS8427\n");
            snd_i2c_unlock(device->bus);
            return err < 0 ? err : -EIO;
      }
      snd_i2c_unlock(device->bus);
      return 0;
}

static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
      uinfo->count = 1;
      return 0;
}

static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_value *ucontrol)
{
      struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
      struct cs8427 *chip = device->private_data;
      
      snd_i2c_lock(device->bus);
      memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
      snd_i2c_unlock(device->bus);
      return 0;
}

static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_value *ucontrol)
{
      struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
      struct cs8427 *chip = device->private_data;
      unsigned char *status = kcontrol->private_value ?
            chip->playback.pcm_status : chip->playback.def_status;
      struct snd_pcm_runtime *runtime = chip->playback.substream ?
            chip->playback.substream->runtime : NULL;
      int err, change;

      snd_i2c_lock(device->bus);
      change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
      memcpy(status, ucontrol->value.iec958.status, 24);
      if (change && (kcontrol->private_value ?
                   runtime != NULL : runtime == NULL)) {
            err = snd_cs8427_send_corudata(device, 0, status, 24);
            if (err < 0)
                  change = err;
      }
      snd_i2c_unlock(device->bus);
      return change;
}

static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
      uinfo->count = 1;
      return 0;
}

static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
      memset(ucontrol->value.iec958.status, 0xff, 24);
      return 0;
}

static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .info =           snd_cs8427_in_status_info,
      .name =           "IEC958 CS8427 Input Status",
      .access =   (SNDRV_CTL_ELEM_ACCESS_READ |
                   SNDRV_CTL_ELEM_ACCESS_VOLATILE),
      .get =            snd_cs8427_in_status_get,
      .private_value = 15,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .info =           snd_cs8427_in_status_info,
      .name =           "IEC958 CS8427 Error Status",
      .access =   (SNDRV_CTL_ELEM_ACCESS_READ |
                   SNDRV_CTL_ELEM_ACCESS_VOLATILE),
      .get =            snd_cs8427_in_status_get,
      .private_value = 16,
},
{
      .access =   SNDRV_CTL_ELEM_ACCESS_READ,
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
      .info =           snd_cs8427_spdif_mask_info,
      .get =            snd_cs8427_spdif_mask_get,
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
      .info =           snd_cs8427_spdif_info,
      .get =            snd_cs8427_spdif_get,
      .put =            snd_cs8427_spdif_put,
      .private_value = 0
},
{
      .access =   (SNDRV_CTL_ELEM_ACCESS_READWRITE |
                   SNDRV_CTL_ELEM_ACCESS_INACTIVE),
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .name =           SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
      .info =           snd_cs8427_spdif_info,
      .get =            snd_cs8427_spdif_get,
      .put =            snd_cs8427_spdif_put,
      .private_value = 1
},
{
      .iface =    SNDRV_CTL_ELEM_IFACE_PCM,
      .info =           snd_cs8427_qsubcode_info,
      .name =           "IEC958 Q-subcode Capture Default",
      .access =   (SNDRV_CTL_ELEM_ACCESS_READ |
                   SNDRV_CTL_ELEM_ACCESS_VOLATILE),
      .get =            snd_cs8427_qsubcode_get
}};

int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
                      struct snd_pcm_substream *play_substream,
                      struct snd_pcm_substream *cap_substream)
{
      struct cs8427 *chip = cs8427->private_data;
      struct snd_kcontrol *kctl;
      unsigned int idx;
      int err;

      snd_assert(play_substream && cap_substream, return -EINVAL);
      for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
            kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
            if (kctl == NULL)
                  return -ENOMEM;
            kctl->id.device = play_substream->pcm->device;
            kctl->id.subdevice = play_substream->number;
            err = snd_ctl_add(cs8427->bus->card, kctl);
            if (err < 0)
                  return err;
            if (! strcmp(kctl->id.name,
                       SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
                  chip->playback.pcm_ctl = kctl;
      }

      chip->playback.substream = play_substream;
      chip->capture.substream = cap_substream;
      snd_assert(chip->playback.pcm_ctl, return -EIO);
      return 0;
}

EXPORT_SYMBOL(snd_cs8427_iec958_build);

int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
{
      struct cs8427 *chip;

      snd_assert(cs8427, return -ENXIO);
      chip = cs8427->private_data;
      if (active)
            memcpy(chip->playback.pcm_status,
                   chip->playback.def_status, 24);
      chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
      snd_ctl_notify(cs8427->bus->card,
                   SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
                   &chip->playback.pcm_ctl->id);
      return 0;
}

EXPORT_SYMBOL(snd_cs8427_iec958_active);

int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
{
      struct cs8427 *chip;
      char *status;
      int err, reset;

      snd_assert(cs8427, return -ENXIO);
      chip = cs8427->private_data;
      status = chip->playback.pcm_status;
      snd_i2c_lock(cs8427->bus);
      if (status[0] & IEC958_AES0_PROFESSIONAL) {
            status[0] &= ~IEC958_AES0_PRO_FS;
            switch (rate) {
            case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
            case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
            case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
            default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
            }
      } else {
            status[3] &= ~IEC958_AES3_CON_FS;
            switch (rate) {
            case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
            case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
            case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
            }
      }
      err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
      if (err > 0)
            snd_ctl_notify(cs8427->bus->card,
                         SNDRV_CTL_EVENT_MASK_VALUE,
                         &chip->playback.pcm_ctl->id);
      reset = chip->rate != rate;
      chip->rate = rate;
      snd_i2c_unlock(cs8427->bus);
      if (reset)
            snd_cs8427_reset(cs8427);
      return err < 0 ? err : 0;
}

EXPORT_SYMBOL(snd_cs8427_iec958_pcm);

static int __init alsa_cs8427_module_init(void)
{
      return 0;
}

static void __exit alsa_cs8427_module_exit(void)
{
}

module_init(alsa_cs8427_module_init)
module_exit(alsa_cs8427_module_exit)

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