diff options
Diffstat (limited to 'drivers/iio/dac/ad5064.c')
| -rw-r--r-- | drivers/iio/dac/ad5064.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/iio/dac/ad5064.c b/drivers/iio/dac/ad5064.c index 2f98cb2a3b96..d33642de9720 100644 --- a/drivers/iio/dac/ad5064.c +++ b/drivers/iio/dac/ad5064.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5625, AD5625R, * AD5627, AD5627R, AD5628, AD5629R, AD5645R, AD5647R, AD5648, AD5665, AD5665R, @@ -6,8 +7,6 @@ * Digital to analog converters driver * * Copyright 2011 Analog Devices Inc. - * - * Licensed under the GPL-2. */ #include <linux/device.h> @@ -112,6 +111,8 @@ struct ad5064_state { bool use_internal_vref; ad5064_write_func write; + /* Lock used to maintain consistency between cached and dev state */ + struct mutex lock; /* * DMA (thus cache coherency maintenance) requires the @@ -248,11 +249,11 @@ static int ad5064_set_powerdown_mode(struct iio_dev *indio_dev, struct ad5064_state *st = iio_priv(indio_dev); int ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->pwr_down_mode[chan->channel] = mode + 1; ret = ad5064_sync_powerdown_mode(st, chan); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret; } @@ -291,11 +292,11 @@ static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev, if (ret) return ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); st->pwr_down[chan->channel] = pwr_down; ret = ad5064_sync_powerdown_mode(st, chan); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret ? ret : len; } @@ -349,12 +350,12 @@ static int ad5064_write_raw(struct iio_dev *indio_dev, if (val >= (1 << chan->scan_type.realbits) || val < 0) return -EINVAL; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); ret = ad5064_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N, chan->address, val, chan->scan_type.shift); if (ret == 0) st->dac_cache[chan->channel] = val; - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); break; default: ret = -EINVAL; @@ -856,6 +857,7 @@ static int ad5064_probe(struct device *dev, enum ad5064_type type, return -ENOMEM; st = iio_priv(indio_dev); + mutex_init(&st->lock); dev_set_drvdata(dev, indio_dev); st->chip_info = &ad5064_chip_info_tbl[type]; |