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

  /*
   *  Routines for control of the AK4113 via I2C/4-wire serial interface
   *  IEC958 (S/PDIF) receiver by Asahi Kasei
   *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   *  Copyright (c) by Pavel Hofman <pavel.hofman@ivitera.com>

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

  #include <linux/module.h>

  #include <sound/core.h>
  #include <sound/control.h>
  #include <sound/pcm.h>
  #include <sound/ak4113.h>
  #include <sound/asoundef.h>
  #include <sound/info.h>
  
  MODULE_AUTHOR("Pavel Hofman <pavel.hofman@ivitera.com>");
  MODULE_DESCRIPTION("AK4113 IEC958 (S/PDIF) receiver by Asahi Kasei");
  MODULE_LICENSE("GPL");
  
  #define AK4113_ADDR			0x00 /* fixed address */
  
  static void ak4113_stats(struct work_struct *work);
  static void ak4113_init_regs(struct ak4113 *chip);
  
  
  static void reg_write(struct ak4113 *ak4113, unsigned char reg,
  		unsigned char val)
  {
  	ak4113->write(ak4113->private_data, reg, val);
  	if (reg < sizeof(ak4113->regmap))
  		ak4113->regmap[reg] = val;
  }
  
  static inline unsigned char reg_read(struct ak4113 *ak4113, unsigned char reg)
  {
  	return ak4113->read(ak4113->private_data, reg);
  }
  
  static void snd_ak4113_free(struct ak4113 *chip)
  {

  	atomic_inc(&chip->wq_processing);	/* don't schedule new work */

  	cancel_delayed_work_sync(&chip->work);

  	kfree(chip);
  }
  
  static int snd_ak4113_dev_free(struct snd_device *device)
  {
  	struct ak4113 *chip = device->device_data;
  	snd_ak4113_free(chip);
  	return 0;
  }
  
  int snd_ak4113_create(struct snd_card *card, ak4113_read_t *read,

  		ak4113_write_t *write, const unsigned char *pgm,

  		void *private_data, struct ak4113 **r_ak4113)
  {
  	struct ak4113 *chip;

  	int err;

  	unsigned char reg;

  	static const struct snd_device_ops ops = {

  		.dev_free =     snd_ak4113_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_DELAYED_WORK(&chip->work, ak4113_stats);

  	atomic_set(&chip->wq_processing, 0);

  	mutex_init(&chip->reinit_mutex);

  
  	for (reg = 0; reg < AK4113_WRITABLE_REGS ; reg++)
  		chip->regmap[reg] = pgm[reg];
  	ak4113_init_regs(chip);
  
  	chip->rcs0 = reg_read(chip, AK4113_REG_RCS0) & ~(AK4113_QINT |
  			AK4113_CINT | AK4113_STC);
  	chip->rcs1 = reg_read(chip, AK4113_REG_RCS1);
  	chip->rcs2 = reg_read(chip, AK4113_REG_RCS2);

  	err = snd_device_new(card, SNDRV_DEV_CODEC, chip, &ops);

  	if (err < 0)
  		goto __fail;
  
  	if (r_ak4113)
  		*r_ak4113 = chip;
  	return 0;
  
  __fail:
  	snd_ak4113_free(chip);

  	return err;

  }
  EXPORT_SYMBOL_GPL(snd_ak4113_create);
  
  void snd_ak4113_reg_write(struct ak4113 *chip, unsigned char reg,
  		unsigned char mask, unsigned char val)
  {
  	if (reg >= AK4113_WRITABLE_REGS)
  		return;
  	reg_write(chip, reg, (chip->regmap[reg] & ~mask) | val);
  }
  EXPORT_SYMBOL_GPL(snd_ak4113_reg_write);
  
  static void ak4113_init_regs(struct ak4113 *chip)
  {
  	unsigned char old = chip->regmap[AK4113_REG_PWRDN], reg;
  
  	/* bring the chip to reset state and powerdown state */
  	reg_write(chip, AK4113_REG_PWRDN, old & ~(AK4113_RST|AK4113_PWN));
  	udelay(200);
  	/* release reset, but leave powerdown */
  	reg_write(chip, AK4113_REG_PWRDN, (old | AK4113_RST) & ~AK4113_PWN);
  	udelay(200);
  	for (reg = 1; reg < AK4113_WRITABLE_REGS; reg++)
  		reg_write(chip, reg, chip->regmap[reg]);
  	/* release powerdown, everything is initialized now */
  	reg_write(chip, AK4113_REG_PWRDN, old | AK4113_RST | AK4113_PWN);
  }
  
  void snd_ak4113_reinit(struct ak4113 *chip)
  {

  	if (atomic_inc_return(&chip->wq_processing) == 1)
  		cancel_delayed_work_sync(&chip->work);

  	mutex_lock(&chip->reinit_mutex);

  	ak4113_init_regs(chip);

  	mutex_unlock(&chip->reinit_mutex);

  	/* bring up statistics / event queing */

  	if (atomic_dec_and_test(&chip->wq_processing))

  		schedule_delayed_work(&chip->work, HZ / 10);
  }
  EXPORT_SYMBOL_GPL(snd_ak4113_reinit);
  
  static unsigned int external_rate(unsigned char rcs1)
  {
  	switch (rcs1 & (AK4113_FS0|AK4113_FS1|AK4113_FS2|AK4113_FS3)) {
  	case AK4113_FS_8000HZ:
  		return 8000;
  	case AK4113_FS_11025HZ:
  		return 11025;
  	case AK4113_FS_16000HZ:
  		return 16000;
  	case AK4113_FS_22050HZ:
  		return 22050;
  	case AK4113_FS_24000HZ:
  		return 24000;
  	case AK4113_FS_32000HZ:
  		return 32000;
  	case AK4113_FS_44100HZ:
  		return 44100;
  	case AK4113_FS_48000HZ:
  		return 48000;
  	case AK4113_FS_64000HZ:
  		return 64000;
  	case AK4113_FS_88200HZ:
  		return 88200;
  	case AK4113_FS_96000HZ:
  		return 96000;
  	case AK4113_FS_176400HZ:
  		return 176400;
  	case AK4113_FS_192000HZ:
  		return 192000;
  	default:
  		return 0;
  	}
  }
  
  static int snd_ak4113_in_error_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 = LONG_MAX;
  	return 0;
  }
  
  static int snd_ak4113_in_error_get(struct snd_kcontrol *kcontrol,
  				   struct snd_ctl_elem_value *ucontrol)
  {
  	struct ak4113 *chip = snd_kcontrol_chip(kcontrol);

  
  	spin_lock_irq(&chip->lock);

  	ucontrol->value.integer.value[0] =
  		chip->errors[kcontrol->private_value];
  	chip->errors[kcontrol->private_value] = 0;

  	spin_unlock_irq(&chip->lock);
  	return 0;
  }
  
  #define snd_ak4113_in_bit_info		snd_ctl_boolean_mono_info
  
  static int snd_ak4113_in_bit_get(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)
  {
  	struct ak4113 *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_ak4113_rx_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 = 5;
  	return 0;
  }
  
  static int snd_ak4113_rx_get(struct snd_kcontrol *kcontrol,
  			     struct snd_ctl_elem_value *ucontrol)
  {
  	struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
  
  	ucontrol->value.integer.value[0] =
  		(AK4113_IPS(chip->regmap[AK4113_REG_IO1]));
  	return 0;
  }
  
  static int snd_ak4113_rx_put(struct snd_kcontrol *kcontrol,
  			     struct snd_ctl_elem_value *ucontrol)
  {
  	struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
  	int change;
  	u8 old_val;
  
  	spin_lock_irq(&chip->lock);
  	old_val = chip->regmap[AK4113_REG_IO1];
  	change = ucontrol->value.integer.value[0] != AK4113_IPS(old_val);
  	if (change)
  		reg_write(chip, AK4113_REG_IO1,
  				(old_val & (~AK4113_IPS(0xff))) |
  				(AK4113_IPS(ucontrol->value.integer.value[0])));
  	spin_unlock_irq(&chip->lock);
  	return change;
  }
  
  static int snd_ak4113_rate_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 = 192000;
  	return 0;
  }
  
  static int snd_ak4113_rate_get(struct snd_kcontrol *kcontrol,
  			       struct snd_ctl_elem_value *ucontrol)
  {
  	struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
  
  	ucontrol->value.integer.value[0] = external_rate(reg_read(chip,
  				AK4113_REG_RCS1));
  	return 0;
  }
  
  static int snd_ak4113_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_ak4113_spdif_get(struct snd_kcontrol *kcontrol,
  				struct snd_ctl_elem_value *ucontrol)
  {
  	struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
  	unsigned i;
  
  	for (i = 0; i < AK4113_REG_RXCSB_SIZE; i++)
  		ucontrol->value.iec958.status[i] = reg_read(chip,
  				AK4113_REG_RXCSB0 + i);
  	return 0;
  }
  
  static int snd_ak4113_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_ak4113_spdif_mask_get(struct snd_kcontrol *kcontrol,
  				      struct snd_ctl_elem_value *ucontrol)
  {
  	memset(ucontrol->value.iec958.status, 0xff, AK4113_REG_RXCSB_SIZE);
  	return 0;
  }
  
  static int snd_ak4113_spdif_pinfo(struct snd_kcontrol *kcontrol,
  		struct snd_ctl_elem_info *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_ak4113_spdif_pget(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)
  {
  	struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
  	unsigned short tmp;
  
  	ucontrol->value.integer.value[0] = 0xf8f2;
  	ucontrol->value.integer.value[1] = 0x4e1f;
  	tmp = reg_read(chip, AK4113_REG_Pc0) |
  		(reg_read(chip, AK4113_REG_Pc1) << 8);
  	ucontrol->value.integer.value[2] = tmp;
  	tmp = reg_read(chip, AK4113_REG_Pd0) |
  		(reg_read(chip, AK4113_REG_Pd1) << 8);
  	ucontrol->value.integer.value[3] = tmp;
  	return 0;
  }
  
  static int snd_ak4113_spdif_qinfo(struct snd_kcontrol *kcontrol,
  		struct snd_ctl_elem_info *uinfo)
  {
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
  	uinfo->count = AK4113_REG_QSUB_SIZE;
  	return 0;
  }
  
  static int snd_ak4113_spdif_qget(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)
  {
  	struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
  	unsigned i;
  
  	for (i = 0; i < AK4113_REG_QSUB_SIZE; i++)
  		ucontrol->value.bytes.data[i] = reg_read(chip,
  				AK4113_REG_QSUB_ADDR + i);
  	return 0;
  }
  
  /* Don't forget to change AK4113_CONTROLS define!!! */

  static const struct snd_kcontrol_new snd_ak4113_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_ak4113_in_error_info,
  	.get =		snd_ak4113_in_error_get,

  	.private_value = AK4113_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_ak4113_in_error_info,
  	.get =		snd_ak4113_in_error_get,

  	.private_value = AK4113_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_ak4113_in_error_info,
  	.get =		snd_ak4113_in_error_get,

  	.private_value = AK4113_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_ak4113_in_error_info,
  	.get =		snd_ak4113_in_error_get,

  	.private_value = AK4113_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_ak4113_rate_info,
  	.get =		snd_ak4113_rate_get,
  },
  {
  	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
  	.name =		SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK),
  	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
  	.info =		snd_ak4113_spdif_mask_info,
  	.get =		snd_ak4113_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_ak4113_spdif_info,
  	.get =		snd_ak4113_spdif_get,
  },
  {
  	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,

  	.name =		"IEC958 Preamble Capture Default",

  	.access =	SNDRV_CTL_ELEM_ACCESS_READ |
  		SNDRV_CTL_ELEM_ACCESS_VOLATILE,
  	.info =		snd_ak4113_spdif_pinfo,
  	.get =		snd_ak4113_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_ak4113_spdif_qinfo,
  	.get =		snd_ak4113_spdif_qget,
  },
  {
  	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
  	.name =		"IEC958 Audio",
  	.access =	SNDRV_CTL_ELEM_ACCESS_READ |
  		SNDRV_CTL_ELEM_ACCESS_VOLATILE,
  	.info =		snd_ak4113_in_bit_info,
  	.get =		snd_ak4113_in_bit_get,
  	.private_value = (1<<31) | (1<<8) | AK4113_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_ak4113_in_bit_info,
  	.get =		snd_ak4113_in_bit_get,
  	.private_value = (0<<8) | AK4113_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_ak4113_in_bit_info,
  	.get =		snd_ak4113_in_bit_get,
  	.private_value = (1<<8) | AK4113_REG_RCS1,
  },
  {
  	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
  	.name =		"AK4113 Input Select",
  	.access =	SNDRV_CTL_ELEM_ACCESS_READ |
  		SNDRV_CTL_ELEM_ACCESS_WRITE,
  	.info =		snd_ak4113_rx_info,
  	.get =		snd_ak4113_rx_get,
  	.put =		snd_ak4113_rx_put,
  }
  };
  
  static void snd_ak4113_proc_regs_read(struct snd_info_entry *entry,
  		struct snd_info_buffer *buffer)
  {
  	struct ak4113 *ak4113 = entry->private_data;
  	int reg, val;
  	/* all ak4113 registers 0x00 - 0x1c */
  	for (reg = 0; reg < 0x1d; reg++) {
  		val = reg_read(ak4113, reg);
  		snd_iprintf(buffer, "0x%02x = 0x%02x
  ", reg, val);
  	}
  }
  
  static void snd_ak4113_proc_init(struct ak4113 *ak4113)
  {

  	snd_card_ro_proc_new(ak4113->card, "ak4113", ak4113,
  			     snd_ak4113_proc_regs_read);

  }
  
  int snd_ak4113_build(struct ak4113 *ak4113,
  		struct snd_pcm_substream *cap_substream)
  {
  	struct snd_kcontrol *kctl;
  	unsigned int idx;
  	int err;
  
  	if (snd_BUG_ON(!cap_substream))
  		return -EINVAL;
  	ak4113->substream = cap_substream;
  	for (idx = 0; idx < AK4113_CONTROLS; idx++) {
  		kctl = snd_ctl_new1(&snd_ak4113_iec958_controls[idx], ak4113);
  		if (kctl == NULL)
  			return -ENOMEM;
  		kctl->id.device = cap_substream->pcm->device;
  		kctl->id.subdevice = cap_substream->number;
  		err = snd_ctl_add(ak4113->card, kctl);
  		if (err < 0)
  			return err;
  		ak4113->kctls[idx] = kctl;
  	}
  	snd_ak4113_proc_init(ak4113);
  	/* trigger workq */
  	schedule_delayed_work(&ak4113->work, HZ / 10);
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_ak4113_build);
  
  int snd_ak4113_external_rate(struct ak4113 *ak4113)
  {
  	unsigned char rcs1;
  
  	rcs1 = reg_read(ak4113, AK4113_REG_RCS1);
  	return external_rate(rcs1);
  }
  EXPORT_SYMBOL_GPL(snd_ak4113_external_rate);
  
  int snd_ak4113_check_rate_and_errors(struct ak4113 *ak4113, unsigned int flags)
  {
  	struct snd_pcm_runtime *runtime =
  		ak4113->substream ? ak4113->substream->runtime : NULL;
  	unsigned long _flags;
  	int res = 0;
  	unsigned char rcs0, rcs1, rcs2;
  	unsigned char c0, c1;
  
  	rcs1 = reg_read(ak4113, AK4113_REG_RCS1);
  	if (flags & AK4113_CHECK_NO_STAT)
  		goto __rate;
  	rcs0 = reg_read(ak4113, AK4113_REG_RCS0);
  	rcs2 = reg_read(ak4113, AK4113_REG_RCS2);
  	spin_lock_irqsave(&ak4113->lock, _flags);
  	if (rcs0 & AK4113_PAR)

  		ak4113->errors[AK4113_PARITY_ERRORS]++;

  	if (rcs0 & AK4113_V)

  		ak4113->errors[AK4113_V_BIT_ERRORS]++;

  	if (rcs2 & AK4113_CCRC)

  		ak4113->errors[AK4113_CCRC_ERRORS]++;

  	if (rcs2 & AK4113_QCRC)

  		ak4113->errors[AK4113_QCRC_ERRORS]++;

  	c0 = (ak4113->rcs0 & (AK4113_QINT | AK4113_CINT | AK4113_STC |
  				AK4113_AUDION | AK4113_AUTO | AK4113_UNLCK)) ^
  		(rcs0 & (AK4113_QINT | AK4113_CINT | AK4113_STC |
  			 AK4113_AUDION | AK4113_AUTO | AK4113_UNLCK));
  	c1 = (ak4113->rcs1 & (AK4113_DTSCD | AK4113_NPCM | AK4113_PEM |
  				AK4113_DAT | 0xf0)) ^
  		(rcs1 & (AK4113_DTSCD | AK4113_NPCM | AK4113_PEM |
  			 AK4113_DAT | 0xf0));
  	ak4113->rcs0 = rcs0 & ~(AK4113_QINT | AK4113_CINT | AK4113_STC);
  	ak4113->rcs1 = rcs1;
  	ak4113->rcs2 = rcs2;
  	spin_unlock_irqrestore(&ak4113->lock, _flags);
  
  	if (rcs0 & AK4113_PAR)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[0]->id);
  	if (rcs0 & AK4113_V)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[1]->id);
  	if (rcs2 & AK4113_CCRC)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[2]->id);
  	if (rcs2 & AK4113_QCRC)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[3]->id);
  
  	/* rate change */
  	if (c1 & 0xf0)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[4]->id);
  
  	if ((c1 & AK4113_PEM) | (c0 & AK4113_CINT))
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[6]->id);
  	if (c0 & AK4113_QINT)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[8]->id);
  
  	if (c0 & AK4113_AUDION)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[9]->id);
  	if (c1 & AK4113_NPCM)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[10]->id);
  	if (c1 & AK4113_DTSCD)
  		snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				&ak4113->kctls[11]->id);
  
  	if (ak4113->change_callback && (c0 | c1) != 0)
  		ak4113->change_callback(ak4113, c0, c1);
  
  __rate:
  	/* compare rate */
  	res = external_rate(rcs1);
  	if (!(flags & AK4113_CHECK_NO_RATE) && runtime &&
  			(runtime->rate != res)) {
  		snd_pcm_stream_lock_irqsave(ak4113->substream, _flags);
  		if (snd_pcm_running(ak4113->substream)) {
  			/*printk(KERN_DEBUG "rate changed (%i <- %i)
  ",
  			 * runtime->rate, res); */
  			snd_pcm_stop(ak4113->substream,
  					SNDRV_PCM_STATE_DRAINING);
  			wake_up(&runtime->sleep);
  			res = 1;
  		}
  		snd_pcm_stream_unlock_irqrestore(ak4113->substream, _flags);
  	}
  	return res;
  }
  EXPORT_SYMBOL_GPL(snd_ak4113_check_rate_and_errors);
  
  static void ak4113_stats(struct work_struct *work)
  {
  	struct ak4113 *chip = container_of(work, struct ak4113, work.work);

  	if (atomic_inc_return(&chip->wq_processing) == 1)

  		snd_ak4113_check_rate_and_errors(chip, chip->check_flags);

  	if (atomic_dec_and_test(&chip->wq_processing))
  		schedule_delayed_work(&chip->work, HZ / 10);

  }

  
  #ifdef CONFIG_PM
  void snd_ak4113_suspend(struct ak4113 *chip)
  {
  	atomic_inc(&chip->wq_processing); /* don't schedule new work */
  	cancel_delayed_work_sync(&chip->work);
  }
  EXPORT_SYMBOL(snd_ak4113_suspend);
  
  void snd_ak4113_resume(struct ak4113 *chip)
  {
  	atomic_dec(&chip->wq_processing);
  	snd_ak4113_reinit(chip);
  }
  EXPORT_SYMBOL(snd_ak4113_resume);
  #endif