diff options
-rw-r--r-- | drivers/staging/iio/meter/ade7754.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/staging/iio/meter/ade7754.c b/drivers/staging/iio/meter/ade7754.c index 6d8eb13f143d..32dc50341746 100644 --- a/drivers/staging/iio/meter/ade7754.c +++ b/drivers/staging/iio/meter/ade7754.c @@ -96,7 +96,7 @@ /** * struct ade7754_state - device instance specific data * @us: actual spi_device - * @buf_lock: mutex to protect tx and rx + * @buf_lock: mutex to protect tx, rx and write frequency * @tx: transmit buffer * @rx: receive buffer **/ @@ -107,17 +107,25 @@ struct ade7754_state { u8 rx[ADE7754_MAX_RX]; }; -static int ade7754_spi_write_reg_8(struct device *dev, u8 reg_address, u8 val) +/* Unlocked version of ade7754_spi_write_reg_8 function */ +static int __ade7754_spi_write_reg_8(struct device *dev, u8 reg_address, u8 val) { - int ret; struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct ade7754_state *st = iio_priv(indio_dev); - mutex_lock(&st->buf_lock); st->tx[0] = ADE7754_WRITE_REG(reg_address); st->tx[1] = val; + return spi_write(st->us, st->tx, 2); +} - ret = spi_write(st->us, st->tx, 2); +static int ade7754_spi_write_reg_8(struct device *dev, u8 reg_address, u8 val) +{ + int ret; + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ade7754_state *st = iio_priv(indio_dev); + + mutex_lock(&st->buf_lock); + ret = __ade7754_spi_write_reg_8(dev, reg_address, val); mutex_unlock(&st->buf_lock); return ret; @@ -512,7 +520,7 @@ static ssize_t ade7754_write_frequency(struct device *dev, if (!val) return -EINVAL; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->buf_lock); t = 26000 / val; if (t > 0) @@ -530,10 +538,10 @@ static ssize_t ade7754_write_frequency(struct device *dev, reg &= ~(3 << 3); reg |= t << 3; - ret = ade7754_spi_write_reg_8(dev, ADE7754_WAVMODE, reg); + ret = __ade7754_spi_write_reg_8(dev, ADE7754_WAVMODE, reg); out: - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->buf_lock); return ret ? ret : len; } |