/*
   *  Routines for control of the AK4117 via 4-wire serial interface
   *  IEC958 (S/PDIF) receiver by Asahi Kasei

   *  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 <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@perex.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(struct ak4117 *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(struct ak4117 *ak4117, unsigned char reg)

  {
  	return ak4117->read(ak4117->private_data, reg);
  }
  
  #if 0

  static void reg_dump(struct ak4117 *ak4117)

  {
  	int i;

  	printk(KERN_DEBUG "AK4117 REG DUMP:
  ");

  	for (i = 0; i < 0x1b; i++)

  		printk(KERN_DEBUG "reg[%02x] = %02x (%02x)
  ", i, reg_read(ak4117, i), i < sizeof(ak4117->regmap) ? ak4117->regmap[i] : 0);

  }
  #endif

  static void snd_ak4117_free(struct ak4117 *chip)

  {
  	del_timer(&chip->timer);
  	kfree(chip);
  }

  static int snd_ak4117_dev_free(struct snd_device *device)

  {

  	struct ak4117 *chip = device->device_data;

  	snd_ak4117_free(chip);
  	return 0;
  }

  int snd_ak4117_create(struct snd_card *card, ak4117_read_t *read, ak4117_write_t *write,

  		      const unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117)

  {

  	struct ak4117 *chip;

  	int err = 0;
  	unsigned char reg;

  	static struct snd_device_ops 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(struct ak4117 *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(struct ak4117 *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(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_ak4117_in_error_get(struct snd_kcontrol *kcontrol,
  				   struct snd_ctl_elem_value *ucontrol)

  {

  	struct ak4117 *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;
  }

  #define snd_ak4117_in_bit_info		snd_ctl_boolean_mono_info

  static int snd_ak4117_in_bit_get(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)

  {

  	struct ak4117 *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(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 = 1;
  	return 0;
  }

  static int snd_ak4117_rx_get(struct snd_kcontrol *kcontrol,
  			     struct snd_ctl_elem_value *ucontrol)

  {

  	struct ak4117 *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(struct snd_kcontrol *kcontrol,
  			     struct snd_ctl_elem_value *ucontrol)

  {

  	struct ak4117 *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(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_ak4117_rate_get(struct snd_kcontrol *kcontrol,
  			       struct snd_ctl_elem_value *ucontrol)

  {

  	struct ak4117 *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(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_ak4117_spdif_get(struct snd_kcontrol *kcontrol,
  				struct snd_ctl_elem_value *ucontrol)

  {

  	struct ak4117 *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(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_ak4117_spdif_mask_get(struct snd_kcontrol *kcontrol,
  				      struct snd_ctl_elem_value *ucontrol)

  {
  	memset(ucontrol->value.iec958.status, 0xff, AK4117_REG_RXCSB_SIZE);
  	return 0;
  }

  static int snd_ak4117_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_ak4117_spdif_pget(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)

  {

  	struct ak4117 *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(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)

  {
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
  	uinfo->count = AK4117_REG_QSUB_SIZE;
  	return 0;
  }

  static int snd_ak4117_spdif_qget(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)

  {

  	struct ak4117 *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 struct snd_kcontrol_new 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(struct ak4117, 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(struct ak4117, 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(struct ak4117, 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(struct ak4117, 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(struct ak4117 *ak4117, struct snd_pcm_substream *cap_substream)

  {

  	struct snd_kcontrol *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(struct ak4117 *ak4117)

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

  int snd_ak4117_check_rate_and_errors(struct ak4117 *ak4117, unsigned int flags)

  {

  	struct snd_pcm_runtime *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
  ", 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)
  ", 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)
  {

  	struct ak4117 *chip = (struct ak4117 *)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);