// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   *  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>

   */

  #include <linux/slab.h>
  #include <linux/delay.h>
  #include <linux/init.h>

  #include <linux/bitrev.h>

  #include <linux/module.h>

  #include <asm/unaligned.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;
  };

  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)
  ", 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
  ", 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
  ", 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;

  	unsigned 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] = bitrev8(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_init(struct snd_i2c_bus *bus,
  		    struct snd_i2c_device *device)

  {
  	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,
  	};

  	struct cs8427 *chip = device->private_data;

  	int err;

  	unsigned char buf[24];

  	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...
  ", 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),
  ",
  			   CS8427_VER8427A, err);
  		snd_printk(KERN_ERR "   initialization is not completed
  ");

  		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 */

  	put_unaligned_le32(SNDRV_PCM_DEFAULT_CON_SPDIF, buf);

  	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 */

  	snd_cs8427_reset(device);
  
  	return 0;
  
  __fail:
  	snd_i2c_unlock(bus);
  
  	return err;
  }
  EXPORT_SYMBOL(snd_cs8427_init);
  
  int snd_cs8427_create(struct snd_i2c_bus *bus,
  		      unsigned char addr,
  		      unsigned int reset_timeout,
  		      struct snd_i2c_device **r_cs8427)
  {
  	int err;
  	struct cs8427 *chip;
  	struct snd_i2c_device *device;
  
  	err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7),
  				    &device);
  	if (err < 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;

  	if (reset_timeout < 1)
  		reset_timeout = 1;
  	chip->reset_timeout = reset_timeout;

  
  	err = snd_cs8427_init(bus, device);
  	if (err)
  		goto __fail;

  
  #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
  ", xx+1, buf[xx]);

  	}
  #endif
  	
  	if (r_cs8427)
  		*r_cs8427 = device;
  	return 0;
  
        __fail:

        	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;

  	if (snd_BUG_ON(!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
  ", 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
  ");

  		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;

  	if (snd_BUG_ON(!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;

  	if (snd_BUG_ON(!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;

  	if (snd_BUG_ON(!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;

  	if (snd_BUG_ON(!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);