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linux/sound/i2c/other/ak4114.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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@perex.cz>
*/
#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/ak4114.h>
#include <sound/asoundef.h>
#include <sound/info.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("AK4114 IEC958 (S/PDIF) receiver by Asahi Kasei");
MODULE_LICENSE("GPL");
#define AK4114_ADDR 0x00 /* fixed address */
static void ak4114_stats(struct work_struct *work);
static void ak4114_init_regs(struct ak4114 *chip);
static void reg_write(struct ak4114 *ak4114, unsigned char reg, unsigned char val)
{
ak4114->write(ak4114->private_data, reg, val);
if (reg <= AK4114_REG_INT1_MASK)
ak4114->regmap[reg] = val;
else if (reg >= AK4114_REG_TXCSB0 && reg <= AK4114_REG_TXCSB4)
ak4114->txcsb[reg-AK4114_REG_TXCSB0] = val;
}
static inline unsigned char reg_read(struct ak4114 *ak4114, unsigned char reg)
{
return ak4114->read(ak4114->private_data, reg);
}
#if 0
static void reg_dump(struct ak4114 *ak4114)
{
int i;
printk(KERN_DEBUG "AK4114 REG DUMP:\n");
for (i = 0; i < 0x20; i++)
printk(KERN_DEBUG "reg[%02x] = %02x (%02x)\n", i, reg_read(ak4114, i), i < ARRAY_SIZE(ak4114->regmap) ? ak4114->regmap[i] : 0);
}
#endif
static void snd_ak4114_free(struct ak4114 *chip)
{
atomic_inc(&chip->wq_processing); /* don't schedule new work */
cancel_delayed_work_sync(&chip->work);
kfree(chip);
}
static int snd_ak4114_dev_free(struct snd_device *device)
{
struct ak4114 *chip = device->device_data;
snd_ak4114_free(chip);
return 0;
}
int snd_ak4114_create(struct snd_card *card,
ak4114_read_t *read, ak4114_write_t *write,
const unsigned char pgm[6], const unsigned char txcsb[5],
void *private_data, struct ak4114 **r_ak4114)
{
struct ak4114 *chip;
int err = 0;
unsigned char reg;
static const struct snd_device_ops ops = {
.dev_free = snd_ak4114_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, ak4114_stats);
atomic_set(&chip->wq_processing, 0);
mutex_init(&chip->reinit_mutex);
for (reg = 0; reg < 6; reg++)
chip->regmap[reg] = pgm[reg];
for (reg = 0; reg < 5; reg++)
chip->txcsb[reg] = txcsb[reg];
ak4114_init_regs(chip);
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_CODEC, chip, &ops)) < 0)
goto __fail;
if (r_ak4114)
*r_ak4114 = chip;
return 0;
__fail:
snd_ak4114_free(chip);
return err;
}
EXPORT_SYMBOL(snd_ak4114_create);
void snd_ak4114_reg_write(struct ak4114 *chip, unsigned char reg, unsigned char mask, unsigned char val)
{
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)
reg_write(chip, reg,
(chip->txcsb[reg-AK4114_REG_TXCSB0] & ~mask) | val);
}
EXPORT_SYMBOL(snd_ak4114_reg_write);
static void ak4114_init_regs(struct ak4114 *chip)
{
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 < 6; 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);
}
void snd_ak4114_reinit(struct ak4114 *chip)
{
if (atomic_inc_return(&chip->wq_processing) == 1)
cancel_delayed_work_sync(&chip->work);
mutex_lock(&chip->reinit_mutex);
ak4114_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(snd_ak4114_reinit);
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;
}
}
static int snd_ak4114_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_ak4114_in_error_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct ak4114 *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_ak4114_in_bit_info snd_ctl_boolean_mono_info
static int snd_ak4114_in_bit_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct ak4114 *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_ak4114_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_ak4114_rate_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
ucontrol->value.integer.value[0] = external_rate(reg_read(chip, AK4114_REG_RCS1));
return 0;
}
static int snd_ak4114_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_ak4114_spdif_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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;
}
static int snd_ak4114_spdif_playback_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
unsigned i;
for (i = 0; i < AK4114_REG_TXCSB_SIZE; i++)
ucontrol->value.iec958.status[i] = chip->txcsb[i];
return 0;
}
static int snd_ak4114_spdif_playback_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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;
}
static int snd_ak4114_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_ak4114_spdif_mask_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
memset(ucontrol->value.iec958.status, 0xff, AK4114_REG_RXCSB_SIZE);
return 0;
}
static int snd_ak4114_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_ak4114_spdif_pget(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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;
}
static int snd_ak4114_spdif_qinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
uinfo->count = AK4114_REG_QSUB_SIZE;
return 0;
}
static int snd_ak4114_spdif_qget(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct ak4114 *chip = snd_kcontrol_chip(kcontrol);
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!!! */
static const struct snd_kcontrol_new snd_ak4114_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_ak4114_in_error_info,
.get = snd_ak4114_in_error_get,
.private_value = AK4114_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_ak4114_in_error_info,
.get = snd_ak4114_in_error_get,
.private_value = AK4114_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_ak4114_in_error_info,
.get = snd_ak4114_in_error_get,
.private_value = AK4114_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_ak4114_in_error_info,
.get = snd_ak4114_in_error_get,
.private_value = AK4114_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_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 Preamble 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,
.private_value = (6<<8) | AK4114_REG_RCS0,
},
{
.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,
.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,
}
};
static void snd_ak4114_proc_regs_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct ak4114 *ak4114 = entry->private_data;
int reg, val;
/* all ak4114 registers 0x00 - 0x1f */
for (reg = 0; reg < 0x20; reg++) {
val = reg_read(ak4114, reg);
snd_iprintf(buffer, "0x%02x = 0x%02x\n", reg, val);
}
}
static void snd_ak4114_proc_init(struct ak4114 *ak4114)
{
snd_card_ro_proc_new(ak4114->card, "ak4114", ak4114,
snd_ak4114_proc_regs_read);
}
int snd_ak4114_build(struct ak4114 *ak4114,
struct snd_pcm_substream *ply_substream,
struct snd_pcm_substream *cap_substream)
{
struct snd_kcontrol *kctl;
unsigned int idx;
int err;
if (snd_BUG_ON(!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;
if (strstr(kctl->id.name, "Playback")) {
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;
}
snd_ak4114_proc_init(ak4114);
/* trigger workq */
schedule_delayed_work(&ak4114->work, HZ / 10);
return 0;
}
EXPORT_SYMBOL(snd_ak4114_build);
/* 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);
if (c0 & AK4114_UNLCK)
snd_ctl_notify(ak4114->card, SNDRV_CTL_EVENT_MASK_VALUE,
&ak4114->kctls[14]->id);
}
int snd_ak4114_external_rate(struct ak4114 *ak4114)
{
unsigned char rcs1;
rcs1 = reg_read(ak4114, AK4114_REG_RCS1);
return external_rate(rcs1);
}
EXPORT_SYMBOL(snd_ak4114_external_rate);
int snd_ak4114_check_rate_and_errors(struct ak4114 *ak4114, unsigned int flags)
{
struct snd_pcm_runtime *runtime = ak4114->capture_substream ? ak4114->capture_substream->runtime : NULL;
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->errors[AK4114_PARITY_ERRORS]++;
if (rcs1 & AK4114_V)
ak4114->errors[AK4114_V_BIT_ERRORS]++;
if (rcs1 & AK4114_CCRC)
ak4114->errors[AK4114_CCRC_ERRORS]++;
if (rcs1 & AK4114_QCRC)
ak4114->errors[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);
ak4114_notify(ak4114, rcs0, rcs1, c0, c1);
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)) {
// printk(KERN_DEBUG "rate changed (%i <- %i)\n", runtime->rate, res);
snd_pcm_stop(ak4114->capture_substream, SNDRV_PCM_STATE_DRAINING);
res = 1;
}
snd_pcm_stream_unlock_irqrestore(ak4114->capture_substream, _flags);
}
return res;
}
EXPORT_SYMBOL(snd_ak4114_check_rate_and_errors);
static void ak4114_stats(struct work_struct *work)
{
struct ak4114 *chip = container_of(work, struct ak4114, work.work);
if (atomic_inc_return(&chip->wq_processing) == 1)
snd_ak4114_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_ak4114_suspend(struct ak4114 *chip)
{
atomic_inc(&chip->wq_processing); /* don't schedule new work */
cancel_delayed_work_sync(&chip->work);
}
EXPORT_SYMBOL(snd_ak4114_suspend);
void snd_ak4114_resume(struct ak4114 *chip)
{
atomic_dec(&chip->wq_processing);
snd_ak4114_reinit(chip);
}
EXPORT_SYMBOL(snd_ak4114_resume);
#endif
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