diff options
| author | Sergiu Cuciurean <sergiu.cuciurean@analog.com> | 2020-05-14 12:01:49 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-05-16 18:16:14 +0300 |
| commit | b0ffd3b6d239320124e1d9c584fa25bcefcbbbce (patch) | |
| tree | 350d66340135e0cbd010eaf5a509c0cb142dfcae /drivers/iio/dac/ad5449.c | |
| parent | 0b4b5925bf16c83c40c4a71e78921d60db840dc2 (diff) | |
| download | linux-b0ffd3b6d239320124e1d9c584fa25bcefcbbbce.tar.xz | |
iio: dac: ad5449: Replace indio_dev->mlock with own device lock
As part of the general cleanup of indio_dev->mlock, this change replaces
it with a local lock on the device's state structure.
Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/dac/ad5449.c')
| -rw-r--r-- | drivers/iio/dac/ad5449.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/iio/dac/ad5449.c b/drivers/iio/dac/ad5449.c index fed3ebaccac4..d739b10e5236 100644 --- a/drivers/iio/dac/ad5449.c +++ b/drivers/iio/dac/ad5449.c @@ -56,11 +56,13 @@ struct ad5449_chip_info { * @has_sdo: whether the SDO line is connected * @dac_cache: Cache for the DAC values * @data: spi transfer buffers + * @lock lock to protect the data buffer during SPI ops */ struct ad5449 { struct spi_device *spi; const struct ad5449_chip_info *chip_info; struct regulator_bulk_data vref_reg[AD5449_MAX_VREFS]; + struct mutex lock; bool has_sdo; uint16_t dac_cache[AD5449_MAX_CHANNELS]; @@ -87,10 +89,10 @@ static int ad5449_write(struct iio_dev *indio_dev, unsigned int addr, struct ad5449 *st = iio_priv(indio_dev); int ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->data[0] = cpu_to_be16((addr << 12) | val); ret = spi_write(st->spi, st->data, 2); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -112,7 +114,7 @@ static int ad5449_read(struct iio_dev *indio_dev, unsigned int addr, }, }; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->data[0] = cpu_to_be16(addr << 12); st->data[1] = cpu_to_be16(AD5449_CMD_NOOP); @@ -123,7 +125,7 @@ static int ad5449_read(struct iio_dev *indio_dev, unsigned int addr, *val = be16_to_cpu(st->data[1]); out_unlock: - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -302,6 +304,8 @@ static int ad5449_spi_probe(struct spi_device *spi) indio_dev->channels = st->chip_info->channels; indio_dev->num_channels = st->chip_info->num_channels; + mutex_init(&st->lock); + if (st->chip_info->has_ctrl) { unsigned int ctrl = 0x00; if (pdata) { |