[PATCH] iio: light: tsl2772: fix ALS calibscale readback

[Yuanshen Cao]

The read_raw() implementation uses IIO_LIGHT to distinguish between the
ambient light and proximity channels when handling
IIO_CHAN_INFO_CALIBSCALE.

However, the ALS channel is registered as IIO_INTENSITY, while
write_raw() correctly writes to IIO_INTENSITY. As a result, reading
in_intensity0_calibscale incorrectly returns the proximity gain instead
of the ALS gain.

This causes the following user-visible behavior:
- Writing in_intensity0_calibscale appears to have no effect because the
  readback reports the proximity gain.
- Writing in_proximity0_calibscale causes both in_proximity0_calibscale
  and in_intensity0_calibscale to report the same value.

Fix this by checking for IIO_INTENSITY in read_raw(), matching the
channel definition and the existing write_raw() implementation.

Signed-off-by: Yuanshen Cao <alex.caoys@xxxxxxxxx>
---
 drivers/iio/light/tsl2772.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c
index 244f44379c36..2287585711c6 100644
--- a/drivers/iio/light/tsl2772.c
+++ b/drivers/iio/light/tsl2772.c
@@ -1274,7 +1274,7 @@ static int tsl2772_read_raw(struct iio_dev *indio_dev,
 		}
 		break;
 	case IIO_CHAN_INFO_CALIBSCALE:
-		if (chan->type == IIO_LIGHT)
+		if (chan->type == IIO_INTENSITY)
 			*val = tsl2772_als_gain[chip->settings.als_gain];
 		else
 			*val = tsl2772_prox_gain[chip->settings.prox_gain];

---
base-commit: 1590cf0329716306e948a8fc29f1d3ee87d3989f
change-id: 20260724-tsl2772-calibscale-fix-0cc42518d5fc

Best regards,
--  
Yuanshen Cao <alex.caoys@xxxxxxxxx>