ak4114.c 18.1 KB
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/*
 *  Routines for control of the AK4114 via I2C and 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/ak4114.h>
#include <sound/asoundef.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("AK4114 IEC958 (S/PDIF) receiver by Asahi Kasei");
MODULE_LICENSE("GPL");

#define AK4114_ADDR			0x00 /* fixed address */

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static void ak4114_stats(struct work_struct *work);
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static void ak4114_init_regs(struct ak4114 *chip);
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static void reg_write(struct ak4114 *ak4114, unsigned char reg, unsigned char val)
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{
	ak4114->write(ak4114->private_data, reg, val);
	if (reg <= AK4114_REG_INT1_MASK)
		ak4114->regmap[reg] = val;
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	else if (reg >= AK4114_REG_TXCSB0 && reg <= AK4114_REG_TXCSB4)
		ak4114->txcsb[reg-AK4114_REG_TXCSB0] = val;
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}

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static inline unsigned char reg_read(struct ak4114 *ak4114, unsigned char reg)
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{
	return ak4114->read(ak4114->private_data, reg);
}

#if 0
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static void reg_dump(struct ak4114 *ak4114)
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{
	int i;

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	printk(KERN_DEBUG "AK4114 REG DUMP:\n");
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	for (i = 0; i < 0x20; i++)
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		printk(KERN_DEBUG "reg[%02x] = %02x (%02x)\n", i, reg_read(ak4114, i), i < sizeof(ak4114->regmap) ? ak4114->regmap[i] : 0);
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}
#endif

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static void snd_ak4114_free(struct ak4114 *chip)
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{
	chip->init = 1;	/* don't schedule new work */
	mb();
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	cancel_delayed_work(&chip->work);
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	flush_scheduled_work();
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	kfree(chip);
}

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static int snd_ak4114_dev_free(struct snd_device *device)
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{
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	struct ak4114 *chip = device->device_data;
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	snd_ak4114_free(chip);
	return 0;
}

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int snd_ak4114_create(struct snd_card *card,
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		      ak4114_read_t *read, ak4114_write_t *write,
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		      const unsigned char pgm[7], const unsigned char txcsb[5],
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		      void *private_data, struct ak4114 **r_ak4114)
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{
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	struct ak4114 *chip;
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	int err = 0;
	unsigned char reg;
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	static struct snd_device_ops ops = {
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		.dev_free =     snd_ak4114_dev_free,
	};

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	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
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	if (chip == NULL)
		return -ENOMEM;
	spin_lock_init(&chip->lock);
	chip->card = card;
	chip->read = read;
	chip->write = write;
	chip->private_data = private_data;
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	INIT_DELAYED_WORK(&chip->work, ak4114_stats);
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	for (reg = 0; reg < 7; reg++)
		chip->regmap[reg] = pgm[reg];
	for (reg = 0; reg < 5; reg++)
		chip->txcsb[reg] = txcsb[reg];

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	ak4114_init_regs(chip);
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	chip->rcs0 = reg_read(chip, AK4114_REG_RCS0) & ~(AK4114_QINT | AK4114_CINT);
	chip->rcs1 = reg_read(chip, AK4114_REG_RCS1);

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

	if (r_ak4114)
		*r_ak4114 = chip;
	return 0;

      __fail:
	snd_ak4114_free(chip);
	return err < 0 ? err : -EIO;
}

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void snd_ak4114_reg_write(struct ak4114 *chip, unsigned char reg, unsigned char mask, unsigned char val)
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{
	if (reg <= AK4114_REG_INT1_MASK)
		reg_write(chip, reg, (chip->regmap[reg] & ~mask) | val);
	else if (reg >= AK4114_REG_TXCSB0 && reg <= AK4114_REG_TXCSB4)
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		reg_write(chip, reg,
			  (chip->txcsb[reg-AK4114_REG_TXCSB0] & ~mask) | val);
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}

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static void ak4114_init_regs(struct ak4114 *chip)
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{
	unsigned char old = chip->regmap[AK4114_REG_PWRDN], reg;

	/* bring the chip to reset state and powerdown state */
	reg_write(chip, AK4114_REG_PWRDN, old & ~(AK4114_RST|AK4114_PWN));
	udelay(200);
	/* release reset, but leave powerdown */
	reg_write(chip, AK4114_REG_PWRDN, (old | AK4114_RST) & ~AK4114_PWN);
	udelay(200);
	for (reg = 1; reg < 7; reg++)
		reg_write(chip, reg, chip->regmap[reg]);
	for (reg = 0; reg < 5; reg++)
		reg_write(chip, reg + AK4114_REG_TXCSB0, chip->txcsb[reg]);
	/* release powerdown, everything is initialized now */
	reg_write(chip, AK4114_REG_PWRDN, old | AK4114_RST | AK4114_PWN);
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}

void snd_ak4114_reinit(struct ak4114 *chip)
{
	chip->init = 1;
	mb();
	flush_scheduled_work();
	ak4114_init_regs(chip);
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	/* bring up statistics / event queing */
	chip->init = 0;
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	if (chip->kctls[0])
		schedule_delayed_work(&chip->work, HZ / 10);
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}

static unsigned int external_rate(unsigned char rcs1)
{
	switch (rcs1 & (AK4114_FS0|AK4114_FS1|AK4114_FS2|AK4114_FS3)) {
	case AK4114_FS_32000HZ: return 32000;
	case AK4114_FS_44100HZ: return 44100;
	case AK4114_FS_48000HZ: return 48000;
	case AK4114_FS_88200HZ: return 88200;
	case AK4114_FS_96000HZ: return 96000;
	case AK4114_FS_176400HZ: return 176400;
	case AK4114_FS_192000HZ: return 192000;
	default:		return 0;
	}
}

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static int snd_ak4114_in_error_info(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_info *uinfo)
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{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = LONG_MAX;
	return 0;
}

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static int snd_ak4114_in_error_get(struct snd_kcontrol *kcontrol,
				   struct snd_ctl_elem_value *ucontrol)
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{
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	struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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	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;
}

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static int snd_ak4114_in_bit_info(struct snd_kcontrol *kcontrol,
				  struct snd_ctl_elem_info *uinfo)
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{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 1;
	return 0;
}

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static int snd_ak4114_in_bit_get(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
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{
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	struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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	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;
}

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static int snd_ak4114_rate_info(struct snd_kcontrol *kcontrol,
				struct snd_ctl_elem_info *uinfo)
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{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 192000;
	return 0;
}

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static int snd_ak4114_rate_get(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_value *ucontrol)
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{
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	struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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	ucontrol->value.integer.value[0] = external_rate(reg_read(chip, AK4114_REG_RCS1));
	return 0;
}

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static int snd_ak4114_spdif_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
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{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
	uinfo->count = 1;
	return 0;
}

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static int snd_ak4114_spdif_get(struct snd_kcontrol *kcontrol,
				struct snd_ctl_elem_value *ucontrol)
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{
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	struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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	unsigned i;

	for (i = 0; i < AK4114_REG_RXCSB_SIZE; i++)
		ucontrol->value.iec958.status[i] = reg_read(chip, AK4114_REG_RXCSB0 + i);
	return 0;
}

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static int snd_ak4114_spdif_playback_get(struct snd_kcontrol *kcontrol,
					 struct snd_ctl_elem_value *ucontrol)
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{
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	struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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	unsigned i;

	for (i = 0; i < AK4114_REG_TXCSB_SIZE; i++)
		ucontrol->value.iec958.status[i] = chip->txcsb[i];
	return 0;
}

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static int snd_ak4114_spdif_playback_put(struct snd_kcontrol *kcontrol,
					 struct snd_ctl_elem_value *ucontrol)
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{
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	struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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	unsigned i;

	for (i = 0; i < AK4114_REG_TXCSB_SIZE; i++)
		reg_write(chip, AK4114_REG_TXCSB0 + i, ucontrol->value.iec958.status[i]);
	return 0;
}

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static int snd_ak4114_spdif_mask_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
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{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
	uinfo->count = 1;
	return 0;
}

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static int snd_ak4114_spdif_mask_get(struct snd_kcontrol *kcontrol,
				      struct snd_ctl_elem_value *ucontrol)
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{
	memset(ucontrol->value.iec958.status, 0xff, AK4114_REG_RXCSB_SIZE);
	return 0;
}

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static int snd_ak4114_spdif_pinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
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{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 0xffff;
	uinfo->count = 4;
	return 0;
}

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static int snd_ak4114_spdif_pget(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
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{
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	struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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	unsigned short tmp;

	ucontrol->value.integer.value[0] = 0xf8f2;
	ucontrol->value.integer.value[1] = 0x4e1f;
	tmp = reg_read(chip, AK4114_REG_Pc0) | (reg_read(chip, AK4114_REG_Pc1) << 8);
	ucontrol->value.integer.value[2] = tmp;
	tmp = reg_read(chip, AK4114_REG_Pd0) | (reg_read(chip, AK4114_REG_Pd1) << 8);
	ucontrol->value.integer.value[3] = tmp;
	return 0;
}

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static int snd_ak4114_spdif_qinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
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{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
	uinfo->count = AK4114_REG_QSUB_SIZE;
	return 0;
}

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static int snd_ak4114_spdif_qget(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
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{
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	struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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	unsigned i;

	for (i = 0; i < AK4114_REG_QSUB_SIZE; i++)
		ucontrol->value.bytes.data[i] = reg_read(chip, AK4114_REG_QSUB_ADDR + i);
	return 0;
}

/* Don't forget to change AK4114_CONTROLS define!!! */
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static struct snd_kcontrol_new snd_ak4114_iec958_controls[] = {
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{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		"IEC958 Parity Errors",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_in_error_info,
	.get =		snd_ak4114_in_error_get,
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	.private_value = offsetof(struct ak4114, parity_errors),
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},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		"IEC958 V-Bit Errors",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_in_error_info,
	.get =		snd_ak4114_in_error_get,
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	.private_value = offsetof(struct ak4114, v_bit_errors),
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},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		"IEC958 C-CRC Errors",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_in_error_info,
	.get =		snd_ak4114_in_error_get,
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	.private_value = offsetof(struct ak4114, ccrc_errors),
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},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		"IEC958 Q-CRC Errors",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_in_error_info,
	.get =		snd_ak4114_in_error_get,
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	.private_value = offsetof(struct ak4114, qcrc_errors),
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},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		"IEC958 External Rate",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_rate_info,
	.get =		snd_ak4114_rate_get,
},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.info =		snd_ak4114_spdif_mask_info,
	.get =		snd_ak4114_spdif_mask_get,
},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_spdif_info,
	.get =		snd_ak4114_spdif_playback_get,
	.put =		snd_ak4114_spdif_playback_put,
},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		SNDRV_CTL_NAME_IEC958("",CAPTURE,MASK),
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.info =		snd_ak4114_spdif_mask_info,
	.get =		snd_ak4114_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_ak4114_spdif_info,
	.get =		snd_ak4114_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_ak4114_spdif_pinfo,
	.get =		snd_ak4114_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_ak4114_spdif_qinfo,
	.get =		snd_ak4114_spdif_qget,
},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		"IEC958 Audio",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_in_bit_info,
	.get =		snd_ak4114_in_bit_get,
	.private_value = (1<<31) | (1<<8) | AK4114_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_ak4114_in_bit_info,
	.get =		snd_ak4114_in_bit_get,
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	.private_value = (6<<8) | AK4114_REG_RCS0,
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},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		"IEC958 DTS Bitstream",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_in_bit_info,
	.get =		snd_ak4114_in_bit_get,
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	.private_value = (3<<8) | AK4114_REG_RCS0,
},
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =		"IEC958 PPL Lock Status",
	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info =		snd_ak4114_in_bit_info,
	.get =		snd_ak4114_in_bit_get,
	.private_value = (1<<31) | (4<<8) | AK4114_REG_RCS0,
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}
};

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int snd_ak4114_build(struct ak4114 *ak4114,
		     struct snd_pcm_substream *ply_substream,
		     struct snd_pcm_substream *cap_substream)
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{
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	struct snd_kcontrol *kctl;
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	unsigned int idx;
	int err;

	snd_assert(cap_substream, return -EINVAL);
	ak4114->playback_substream = ply_substream;
	ak4114->capture_substream = cap_substream;
	for (idx = 0; idx < AK4114_CONTROLS; idx++) {
		kctl = snd_ctl_new1(&snd_ak4114_iec958_controls[idx], ak4114);
		if (kctl == NULL)
			return -ENOMEM;
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		if (strstr(kctl->id.name, "Playback")) {
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			if (ply_substream == NULL) {
				snd_ctl_free_one(kctl);
				ak4114->kctls[idx] = NULL;
				continue;
			}
			kctl->id.device = ply_substream->pcm->device;
			kctl->id.subdevice = ply_substream->number;
		} else {
			kctl->id.device = cap_substream->pcm->device;
			kctl->id.subdevice = cap_substream->number;
		}
		err = snd_ctl_add(ak4114->card, kctl);
		if (err < 0)
			return err;
		ak4114->kctls[idx] = kctl;
	}
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	/* trigger workq */
	schedule_delayed_work(&ak4114->work, HZ / 10);
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	return 0;
}

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/* notify kcontrols if any parameters are changed */
static void ak4114_notify(struct ak4114 *ak4114,
			  unsigned char rcs0, unsigned char rcs1,
			  unsigned char c0, unsigned char c1)
{
	if (!ak4114->kctls[0])
		return;

	if (rcs0 & AK4114_PAR)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[0]->id);
	if (rcs0 & AK4114_V)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[1]->id);
	if (rcs1 & AK4114_CCRC)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[2]->id);
	if (rcs1 & AK4114_QCRC)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[3]->id);

	/* rate change */
	if (c1 & 0xf0)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[4]->id);

	if ((c0 & AK4114_PEM) | (c0 & AK4114_CINT))
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[9]->id);
	if (c0 & AK4114_QINT)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[10]->id);

	if (c0 & AK4114_AUDION)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[11]->id);
	if (c0 & AK4114_AUTO)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[12]->id);
	if (c0 & AK4114_DTSCD)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[13]->id);
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	if (c0 & AK4114_UNLCK)
		snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       &ak4114->kctls[14]->id);
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}

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int snd_ak4114_external_rate(struct ak4114 *ak4114)
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{
	unsigned char rcs1;

	rcs1 = reg_read(ak4114, AK4114_REG_RCS1);
	return external_rate(rcs1);
}

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int snd_ak4114_check_rate_and_errors(struct ak4114 *ak4114, unsigned int flags)
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{
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	struct snd_pcm_runtime *runtime = ak4114->capture_substream ? ak4114->capture_substream->runtime : NULL;
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	unsigned long _flags;
	int res = 0;
	unsigned char rcs0, rcs1;
	unsigned char c0, c1;

	rcs1 = reg_read(ak4114, AK4114_REG_RCS1);
	if (flags & AK4114_CHECK_NO_STAT)
		goto __rate;
	rcs0 = reg_read(ak4114, AK4114_REG_RCS0);
	spin_lock_irqsave(&ak4114->lock, _flags);
	if (rcs0 & AK4114_PAR)
		ak4114->parity_errors++;
	if (rcs1 & AK4114_V)
		ak4114->v_bit_errors++;
	if (rcs1 & AK4114_CCRC)
		ak4114->ccrc_errors++;
	if (rcs1 & AK4114_QCRC)
		ak4114->qcrc_errors++;
	c0 = (ak4114->rcs0 & (AK4114_QINT | AK4114_CINT | AK4114_PEM | AK4114_AUDION | AK4114_AUTO | AK4114_UNLCK)) ^
                     (rcs0 & (AK4114_QINT | AK4114_CINT | AK4114_PEM | AK4114_AUDION | AK4114_AUTO | AK4114_UNLCK));
	c1 = (ak4114->rcs1 & 0xf0) ^ (rcs1 & 0xf0);
	ak4114->rcs0 = rcs0 & ~(AK4114_QINT | AK4114_CINT);
	ak4114->rcs1 = rcs1;
	spin_unlock_irqrestore(&ak4114->lock, _flags);

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	ak4114_notify(ak4114, rcs0, rcs1, c0, c1);
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	if (ak4114->change_callback && (c0 | c1) != 0)
		ak4114->change_callback(ak4114, c0, c1);

      __rate:
	/* compare rate */
	res = external_rate(rcs1);
	if (!(flags & AK4114_CHECK_NO_RATE) && runtime && runtime->rate != res) {
		snd_pcm_stream_lock_irqsave(ak4114->capture_substream, _flags);
		if (snd_pcm_running(ak4114->capture_substream)) {
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			// printk(KERN_DEBUG "rate changed (%i <- %i)\n", runtime->rate, res);
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			snd_pcm_stop(ak4114->capture_substream, SNDRV_PCM_STATE_DRAINING);
			res = 1;
		}
		snd_pcm_stream_unlock_irqrestore(ak4114->capture_substream, _flags);
	}
	return res;
}

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static void ak4114_stats(struct work_struct *work)
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{
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	struct ak4114 *chip = container_of(work, struct ak4114, work.work);
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	if (!chip->init)
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		snd_ak4114_check_rate_and_errors(chip, 0);

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	schedule_delayed_work(&chip->work, HZ / 10);
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}

EXPORT_SYMBOL(snd_ak4114_create);
EXPORT_SYMBOL(snd_ak4114_reg_write);
EXPORT_SYMBOL(snd_ak4114_reinit);
EXPORT_SYMBOL(snd_ak4114_build);
EXPORT_SYMBOL(snd_ak4114_external_rate);
EXPORT_SYMBOL(snd_ak4114_check_rate_and_errors);