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path: root/drivers/iio/dac/ad5360.c
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Diffstat (limited to 'drivers/iio/dac/ad5360.c')
-rw-r--r--drivers/iio/dac/ad5360.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/iio/dac/ad5360.c b/drivers/iio/dac/ad5360.c
index 2ac428b957e3..602dd2ba61b5 100644
--- a/drivers/iio/dac/ad5360.c
+++ b/drivers/iio/dac/ad5360.c
@@ -67,6 +67,7 @@ struct ad5360_chip_info {
* @chip_info: chip model specific constants, available modes etc
* @vref_reg: vref supply regulators
* @ctrl: control register cache
+ * @lock: lock to protect the data buffer during SPI ops
* @data: spi transfer buffers
*/
@@ -75,6 +76,7 @@ struct ad5360_state {
const struct ad5360_chip_info *chip_info;
struct regulator_bulk_data vref_reg[3];
unsigned int ctrl;
+ struct mutex lock;
/*
* DMA (thus cache coherency maintenance) requires the
@@ -205,10 +207,11 @@ static int ad5360_write(struct iio_dev *indio_dev, unsigned int cmd,
unsigned int addr, unsigned int val, unsigned int shift)
{
int ret;
+ struct ad5360_state *st = iio_priv(indio_dev);
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
ret = ad5360_write_unlocked(indio_dev, cmd, addr, val, shift);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -229,7 +232,7 @@ static int ad5360_read(struct iio_dev *indio_dev, unsigned int type,
},
};
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
st->data[0].d32 = cpu_to_be32(AD5360_CMD(AD5360_CMD_SPECIAL_FUNCTION) |
AD5360_ADDR(AD5360_REG_SF_READBACK) |
@@ -240,7 +243,7 @@ static int ad5360_read(struct iio_dev *indio_dev, unsigned int type,
if (ret >= 0)
ret = be32_to_cpu(st->data[1].d32) & 0xffff;
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -261,7 +264,7 @@ static int ad5360_update_ctrl(struct iio_dev *indio_dev, unsigned int set,
struct ad5360_state *st = iio_priv(indio_dev);
unsigned int ret;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
st->ctrl |= set;
st->ctrl &= ~clr;
@@ -269,7 +272,7 @@ static int ad5360_update_ctrl(struct iio_dev *indio_dev, unsigned int set,
ret = ad5360_write_unlocked(indio_dev, AD5360_CMD_SPECIAL_FUNCTION,
AD5360_REG_SF_CTRL, st->ctrl, 0);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -473,12 +476,13 @@ static int ad5360_probe(struct spi_device *spi)
st->chip_info = &ad5360_chip_info_tbl[type];
st->spi = spi;
- indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad5360_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->num_channels = st->chip_info->num_channels;
+ mutex_init(&st->lock);
+
ret = ad5360_alloc_channels(indio_dev);
if (ret) {
dev_err(&spi->dev, "Failed to allocate channel spec: %d\n", ret);