diff options
Diffstat (limited to 'drivers/iio/dac/ad5360.c')
| -rw-r--r-- | drivers/iio/dac/ad5360.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/iio/dac/ad5360.c b/drivers/iio/dac/ad5360.c index 2ac428b957e3..3e0c9e84e8da 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; } @@ -479,6 +482,8 @@ static int ad5360_probe(struct spi_device *spi) 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); |