iio: adc: ad7793: use iio helper function to guarantee direct mode

Replace the code that guarantees the device stays in direct mode
with iio_device_claim_direct_mode() which does same.

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Cc: Daniel Baluta <daniel.baluta@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
index 847789b..e6706a0 100644 (file)
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -519,11 +519,9 @@ static int ad7793_write_raw(struct iio_dev *indio_dev,
        int ret, i;
        unsigned int tmp;
 
-       mutex_lock(&indio_dev->mlock);
-       if (iio_buffer_enabled(indio_dev)) {
-               mutex_unlock(&indio_dev->mlock);
-               return -EBUSY;
-       }
+       ret = iio_device_claim_direct_mode(indio_dev);
+       if (ret)
+               return ret;
 
        switch (mask) {
        case IIO_CHAN_INFO_SCALE:
@@ -548,7 +546,7 @@ static int ad7793_write_raw(struct iio_dev *indio_dev,
                ret = -EINVAL;
        }
 
-       mutex_unlock(&indio_dev->mlock);
+       iio_device_release_direct_mode(indio_dev);
        return ret;
 }