[PATCH 2/2] iio: light: adux1020: extract the FIFO byte count with FIELD_GET()

[Raffaele Tranfaglia via B4 Relay]

From: Raffaele Tranfaglia <raffaele.tranfaglia@xxxxxxxxx>

adux1020_measure() masks INT_STATUS with ADUX1020_FIFO_STATUS_MASK but
does not shift the result down, so it compares 256 times the FIFO byte
count against the packet size. A count of 1 would thus be treated as a
complete 2-byte proximity packet.

This does not happen on a correctly working device, because the FIFO
only stores complete packets and the driver always reads complete
packets, so the count is always a multiple of the packet size. Still,
use FIELD_GET() so the comparison matches the datasheet's polling
procedure and does not depend on that.

Signed-off-by: Raffaele Tranfaglia <raffaele.tranfaglia@xxxxxxxxx>
---
 drivers/iio/light/adux1020.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c
index cccd509dd18a..dd5230c6dceb 100644
--- a/drivers/iio/light/adux1020.c
+++ b/drivers/iio/light/adux1020.c
@@ -331,7 +331,7 @@ static int adux1020_measure(struct adux1020_data *data,
 		if (ret < 0)
 			return ret;
 
-		status &= ADUX1020_FIFO_STATUS_MASK;
+		status = FIELD_GET(ADUX1020_FIFO_STATUS_MASK, status);
 		if (status >= adux1020_modes[mode].bytes)
 			break;
 		msleep(20);

-- 
2.56.0