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 <[email protected]>

Cc Daniel Baluta <[email protected]>

---

This driver is not doing any error checking on the code I just wrapped in device_claim/release. It first saves info to the global state and then writes it to a register, with no error checking.

Does similar in both *write_raw, and *write_frequency.

I could add error checking in another patch if it's desired. I don't have this sensor to verify. Let me know if that would be welcome. Thanks!

 drivers/iio/adc/ad7793.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

drivers/iio/adc/ad7793.c +4 -6

index 847789b..e6706a0 100644
@@ -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;
 }