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iio: dac: ad5446: Make use of the cleanup helpers

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Use the auto unlocking helpers from cleanup.h. Allows for some code
simplification.

While at it, don't use the ternary operator in
ad5446_write_dac_powerdown() and add an helper function to write the DAC
code. The reason for the function was purely to avoid having to use
unreachable().

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nuno Sá
2025-11-04 15:35:14 +00:00
committed by Jonathan Cameron
parent 6e43c10675
commit 308d4474cf
1 changed files with 26 additions and 19 deletions
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45
drivers/iio/dac/ad5446.c
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@@ -5,6 +5,7 @@
* Copyright 2010 Analog Devices Inc.
*/
#include <linux/cleanup.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
@@ -80,7 +81,7 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
if (ret)
return ret;
mutex_lock(&st->lock);
guard(mutex)(&st->lock);
st->pwr_down = powerdown;
if (st->pwr_down) {
@@ -91,9 +92,10 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
}
ret = st->chip_info->write(st, val);
mutex_unlock(&st->lock);
if (ret)
return ret;
return ret ? ret : len;
return len;
}
const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = {
@@ -129,32 +131,37 @@ static int ad5446_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
static int ad5446_write_dac_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
int val)
{
struct ad5446_state *st = iio_priv(indio_dev);
if (val >= (1 << chan->scan_type.realbits) || val < 0)
return -EINVAL;
val <<= chan->scan_type.shift;
guard(mutex)(&st->lock);
st->cached_val = val;
if (st->pwr_down)
return 0;
return st->chip_info->write(st, val);
}
static int ad5446_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct ad5446_state *st = iio_priv(indio_dev);
int ret = 0;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (val >= (1 << chan->scan_type.realbits) || val < 0)
return -EINVAL;
val <<= chan->scan_type.shift;
mutex_lock(&st->lock);
st->cached_val = val;
if (!st->pwr_down)
ret = st->chip_info->write(st, val);
mutex_unlock(&st->lock);
break;
return ad5446_write_dac_raw(indio_dev, chan, val);
default:
ret = -EINVAL;
return -EINVAL;
}
return ret;
}
static const struct iio_info ad5446_info = {