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linux/sound/i2c/other/ak4113.c
Takashi Iwai 239480ab92 ALSA: ak411x: Use array instead of offsetof() 
The ak4113, ak4114 and ak4117 i2c drivers have some tricky codes to
access the struct fields in the callback.  This can be simplified by
replacing the struct fields with the array.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-05-17 07:13:03 +02:00

657 lines
18 KiB
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/*
* 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>
*
*
* 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 <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 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 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\n", reg, val);
}
}
static void snd_ak4113_proc_init(struct ak4113 *ak4113)
{
struct snd_info_entry *entry;
if (!snd_card_proc_new(ak4113->card, "ak4113", &entry))
snd_info_set_text_ops(entry, 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)\n",
* 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
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