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path: root/drivers/iio/amplifiers/ad8366.c
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Diffstat (limited to 'drivers/iio/amplifiers/ad8366.c')
-rw-r--r--drivers/iio/amplifiers/ad8366.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index 82ac15914ff3..24ff5475d9f2 100644
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -21,6 +21,7 @@
struct ad8366_state {
struct spi_device *spi;
struct regulator *reg;
+ struct mutex lock; /* protect sensor state */
unsigned char ch[2];
/*
* DMA (thus cache coherency maintenance) requires the
@@ -58,7 +59,7 @@ static int ad8366_read_raw(struct iio_dev *indio_dev,
int ret;
unsigned code;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
switch (m) {
case IIO_CHAN_INFO_HARDWAREGAIN:
code = st->ch[chan->channel];
@@ -73,7 +74,7 @@ static int ad8366_read_raw(struct iio_dev *indio_dev,
default:
ret = -EINVAL;
}
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
};
@@ -99,7 +100,7 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
code = (code - 4500) / 253;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
st->ch[chan->channel] = code;
@@ -108,7 +109,7 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
default:
ret = -EINVAL;
}
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -151,6 +152,7 @@ static int ad8366_probe(struct spi_device *spi)
}
spi_set_drvdata(spi, indio_dev);
+ mutex_init(&st->lock);
st->spi = spi;
indio_dev->dev.parent = &spi->dev;