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| author | Sergiu Cuciurean <sergiu.cuciurean@analog.com> | 2020-05-14 12:06:05 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-05-16 16:17:35 +0100 |
| commit | a49e961c7c0aecd2cffaf686e2d91b510c0d8405 (patch) | |
| tree | b80e7e19845e47cb2179e6ec31fafa466edc8b01 /drivers/iio/dac | |
| parent | b0ffd3b6d239320124e1d9c584fa25bcefcbbbce (diff) | |
| download | linux-stable-a49e961c7c0aecd2cffaf686e2d91b510c0d8405.tar.gz linux-stable-a49e961c7c0aecd2cffaf686e2d91b510c0d8405.tar.bz2 linux-stable-a49e961c7c0aecd2cffaf686e2d91b510c0d8405.zip | |
iio: dac: ad5755: 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.
This also changes some internal functions to pass the pointer to the
state-struct vs a ref to indio_dev just to access the state-struct again.
Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/dac')
| -rw-r--r-- | drivers/iio/dac/ad5755.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/iio/dac/ad5755.c b/drivers/iio/dac/ad5755.c index 388ddd14bfd0..7723bd313fc6 100644 --- a/drivers/iio/dac/ad5755.c +++ b/drivers/iio/dac/ad5755.c @@ -82,6 +82,7 @@ struct ad5755_chip_info { * @pwr_down: bitmask which contains hether a channel is powered down or not * @ctrl: software shadow of the channel ctrl registers * @channels: iio channel spec for the device + * @lock lock to protect the data buffer during SPI ops * @data: spi transfer buffers */ struct ad5755_state { @@ -90,6 +91,7 @@ struct ad5755_state { unsigned int pwr_down; unsigned int ctrl[AD5755_NUM_CHANNELS]; struct iio_chan_spec channels[AD5755_NUM_CHANNELS]; + struct mutex lock; /* * DMA (thus cache coherency maintenance) requires the @@ -174,11 +176,12 @@ static int ad5755_write_ctrl_unlocked(struct iio_dev *indio_dev, static int ad5755_write(struct iio_dev *indio_dev, unsigned int reg, unsigned int val) { + struct ad5755_state *st = iio_priv(indio_dev); int ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); ret = ad5755_write_unlocked(indio_dev, reg, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -186,11 +189,12 @@ static int ad5755_write(struct iio_dev *indio_dev, unsigned int reg, static int ad5755_write_ctrl(struct iio_dev *indio_dev, unsigned int channel, unsigned int reg, unsigned int val) { + struct ad5755_state *st = iio_priv(indio_dev); int ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); ret = ad5755_write_ctrl_unlocked(indio_dev, channel, reg, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -211,7 +215,7 @@ static int ad5755_read(struct iio_dev *indio_dev, unsigned int addr) }, }; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->data[0].d32 = cpu_to_be32(AD5755_READ_FLAG | (addr << 16)); st->data[1].d32 = cpu_to_be32(AD5755_NOOP); @@ -220,7 +224,7 @@ static int ad5755_read(struct iio_dev *indio_dev, unsigned int addr) if (ret >= 0) ret = be32_to_cpu(st->data[1].d32) & 0xffff; - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -246,7 +250,7 @@ static int ad5755_set_channel_pwr_down(struct iio_dev *indio_dev, struct ad5755_state *st = iio_priv(indio_dev); unsigned int mask = BIT(channel); - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); if ((bool)(st->pwr_down & mask) == pwr_down) goto out_unlock; @@ -266,7 +270,7 @@ static int ad5755_set_channel_pwr_down(struct iio_dev *indio_dev, } out_unlock: - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return 0; } @@ -746,6 +750,8 @@ static int ad5755_probe(struct spi_device *spi) indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->num_channels = AD5755_NUM_CHANNELS; + mutex_init(&st->lock); + if (spi->dev.of_node) pdata = ad5755_parse_dt(&spi->dev); else |