diff options
Diffstat (limited to 'drivers/iio/dac/ad5421.c')
| -rw-r--r-- | drivers/iio/dac/ad5421.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/iio/dac/ad5421.c b/drivers/iio/dac/ad5421.c index 63063e85cd0a..fec27764cea8 100644 --- a/drivers/iio/dac/ad5421.c +++ b/drivers/iio/dac/ad5421.c @@ -62,12 +62,14 @@ * @current_range: current range which the device is configured for * @data: spi transfer buffers * @fault_mask: software masking of events + * @lock lock to protect the data buffer during SPI ops */ struct ad5421_state { struct spi_device *spi; unsigned int ctrl; enum ad5421_current_range current_range; unsigned int fault_mask; + struct mutex lock; /* * DMA (thus cache coherency maintenance) requires the @@ -142,11 +144,12 @@ static int ad5421_write_unlocked(struct iio_dev *indio_dev, static int ad5421_write(struct iio_dev *indio_dev, unsigned int reg, unsigned int val) { + struct ad5421_state *st = iio_priv(indio_dev); int ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); ret = ad5421_write_unlocked(indio_dev, reg, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -166,7 +169,7 @@ static int ad5421_read(struct iio_dev *indio_dev, unsigned int reg) }, }; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16)); @@ -174,7 +177,7 @@ static int ad5421_read(struct iio_dev *indio_dev, unsigned int reg) if (ret >= 0) ret = be32_to_cpu(st->data[1].d32) & 0xffff; - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -185,14 +188,14 @@ static int ad5421_update_ctrl(struct iio_dev *indio_dev, unsigned int set, struct ad5421_state *st = iio_priv(indio_dev); unsigned int ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->ctrl &= ~clr; st->ctrl |= set; ret = ad5421_write_unlocked(indio_dev, AD5421_REG_CTRL, st->ctrl); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -400,12 +403,12 @@ static int ad5421_write_event_config(struct iio_dev *indio_dev, return -EINVAL; } - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); if (state) st->fault_mask |= mask; else st->fault_mask &= ~mask; - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return 0; } @@ -491,6 +494,8 @@ static int ad5421_probe(struct spi_device *spi) indio_dev->channels = ad5421_channels; indio_dev->num_channels = ARRAY_SIZE(ad5421_channels); + mutex_init(&st->lock); + st->ctrl = AD5421_CTRL_WATCHDOG_DISABLE | AD5421_CTRL_AUTO_FAULT_READBACK; |