diff options
Diffstat (limited to 'drivers/iio/dac/ad5446.c')
| -rw-r--r-- | drivers/iio/dac/ad5446.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/iio/dac/ad5446.c b/drivers/iio/dac/ad5446.c index 61c670f7fc5f..8f8afc8999bc 100644 --- a/drivers/iio/dac/ad5446.c +++ b/drivers/iio/dac/ad5446.c @@ -21,6 +21,8 @@ #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> +#include <asm/unaligned.h> + #define MODE_PWRDWN_1k 0x1 #define MODE_PWRDWN_100k 0x2 #define MODE_PWRDWN_TRISTATE 0x3 @@ -31,6 +33,7 @@ * @chip_info: chip model specific constants, available modes etc * @reg: supply regulator * @vref_mv: actual reference voltage used + * @lock lock to protect the data buffer during write ops */ struct ad5446_state { @@ -41,6 +44,7 @@ struct ad5446_state { unsigned cached_val; unsigned pwr_down_mode; unsigned pwr_down; + struct mutex lock; }; /** @@ -110,7 +114,7 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, if (ret) return ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->pwr_down = powerdown; if (st->pwr_down) { @@ -121,7 +125,7 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, } ret = st->chip_info->write(st, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret ? ret : len; } @@ -195,11 +199,11 @@ static int ad5446_write_raw(struct iio_dev *indio_dev, return -EINVAL; val <<= chan->scan_type.shift; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->cached_val = val; if (!st->pwr_down) ret = st->chip_info->write(st, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); break; default: ret = -EINVAL; @@ -254,6 +258,8 @@ static int ad5446_probe(struct device *dev, const char *name, indio_dev->channels = &st->chip_info->channel; indio_dev->num_channels = 1; + mutex_init(&st->lock); + st->pwr_down_mode = MODE_PWRDWN_1k; if (st->chip_info->int_vref_mv) @@ -302,9 +308,7 @@ static int ad5660_write(struct ad5446_state *st, unsigned val) struct spi_device *spi = to_spi_device(st->dev); uint8_t data[3]; - data[0] = (val >> 16) & 0xFF; - data[1] = (val >> 8) & 0xFF; - data[2] = val & 0xFF; + put_unaligned_be24(val, &data[0]); return spi_write(spi, data, sizeof(data)); } |