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linux/sound/i2c/other/ak4113.c

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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)
{
chip->init = 1; /* don't schedule new work */
mb();
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 = 0;
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);
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_LOWLEVEL, chip, &ops);
if (err < 0)
goto __fail;
if (r_ak4113)
*r_ak4113 = chip;
return 0;
__fail:
snd_ak4113_free(chip);
return err < 0 ? err : -EIO;
}
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)
{
chip->init = 1;
mb();
flush_delayed_work(&chip->work);
ak4113_init_regs(chip);
/* bring up statistics / event queing */
chip->init = 0;
if (chip->kctls[0])
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);
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_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 = offsetof(struct 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 = offsetof(struct 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 = offsetof(struct 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 = offsetof(struct 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 Preample 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->parity_errors++;
if (rcs0 & AK4113_V)
ak4113->v_bit_errors++;
if (rcs2 & AK4113_CCRC)
ak4113->ccrc_errors++;
if (rcs2 & AK4113_QCRC)
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 (!chip->init)
snd_ak4113_check_rate_and_errors(chip, chip->check_flags);
schedule_delayed_work(&chip->work, HZ / 10);
}
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