[PATCH 10/16] iio: adc: max1027: Prevent single channel accesses during buffer reads

[Miquel Raynal]

When hardware buffers are enabled (the cnvst pin being the trigger), one
should not mess with the device state by requesting a single channel
read. Prevent it with a iio_buffer_enabled() check.

Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
 drivers/iio/adc/max1027.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index 223c9e4abd86..83526f3d7d3a 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -335,6 +335,8 @@ static int max1027_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
+		if (iio_buffer_enabled(indio_dev))
+			return -EBUSY;
 		ret = max1027_read_single_value(indio_dev, chan, val);
 		break;
 	case IIO_CHAN_INFO_SCALE:
-- 
2.27.0