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path: root/drivers/iio/dac/ad7303.c
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Diffstat (limited to 'drivers/iio/dac/ad7303.c')
-rw-r--r--drivers/iio/dac/ad7303.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/iio/dac/ad7303.c b/drivers/iio/dac/ad7303.c
index 8de9f40226e6..14bbac6bee98 100644
--- a/drivers/iio/dac/ad7303.c
+++ b/drivers/iio/dac/ad7303.c
@@ -41,6 +41,7 @@ struct ad7303_state {
struct regulator *vdd_reg;
struct regulator *vref_reg;
+ struct mutex lock;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@@ -79,7 +80,7 @@ static ssize_t ad7303_write_dac_powerdown(struct iio_dev *indio_dev,
if (ret)
return ret;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
if (pwr_down)
st->config |= AD7303_CFG_POWER_DOWN(chan->channel);
@@ -90,7 +91,7 @@ static ssize_t ad7303_write_dac_powerdown(struct iio_dev *indio_dev,
* mode, so just write one of the DAC channels again */
ad7303_write(st, chan->channel, st->dac_cache[chan->channel]);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return len;
}
@@ -116,7 +117,9 @@ static int ad7303_read_raw(struct iio_dev *indio_dev,
switch (info) {
case IIO_CHAN_INFO_RAW:
+ mutex_lock(&st->lock);
*val = st->dac_cache[chan->channel];
+ mutex_unlock(&st->lock);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
vref_uv = ad7303_get_vref(st, chan);
@@ -144,11 +147,11 @@ static int ad7303_write_raw(struct iio_dev *indio_dev,
if (val >= (1 << chan->scan_type.realbits) || val < 0)
return -EINVAL;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
ret = ad7303_write(st, chan->address, val);
if (ret == 0)
st->dac_cache[chan->channel] = val;
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
break;
default:
ret = -EINVAL;
@@ -211,6 +214,8 @@ static int ad7303_probe(struct spi_device *spi)
st->spi = spi;
+ mutex_init(&st->lock);
+
st->vdd_reg = devm_regulator_get(&spi->dev, "Vdd");
if (IS_ERR(st->vdd_reg))
return PTR_ERR(st->vdd_reg);