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X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-09_05,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 suspectscore=0 clxscore=1011 phishscore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 priorityscore=1501 malwarescore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611090063 On Mon, Nov 09, 2026 at 05:55:53PM +0800, raoxu wrote: > From: Xu Rao > > The LTC2473 reports its differential conversion result as an unsigned > 16-bit value spanning -VREF to +VREF. The IIO scale is consequently > reported as 2 * VREF divided by 2^16. > > IIO offsets are expressed in raw codes, but the driver currently returns > -LTC2471_VREF, which is a millivolt value. This makes the processed > reading incorrect: with a 1.25 V reference, the midpoint raw code is > shifted by 1250 instead of 32768 codes. > > Return the raw-code offset so that the midpoint maps to 0 mV and the > endpoints map to -VREF and +VREF as intended. The single-ended LTC2471 > does not expose the offset attribute and is unaffected. > > The supplied fix was reviewed and this commit message prepared with > OpenCode AI assistance. > > Fixes: 1d3eacbfa644 ("iio: Add LTC2471/LTC2473 driver") > Signed-off-by: Xu Rao > Cc: stable@vger.kernel.org > --- Auch! LGTM Reviewed-by: Nuno Sá > drivers/iio/adc/ltc2471.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/iio/adc/ltc2471.c b/drivers/iio/adc/ltc2471.c > index 369af700969f..1c88c824d92d 100644 > --- a/drivers/iio/adc/ltc2471.c > +++ b/drivers/iio/adc/ltc2471.c > @@ -69,7 +69,7 @@ static int ltc2471_read_raw(struct iio_dev *indio_dev, > > case IIO_CHAN_INFO_OFFSET: > /* Only differential chip has this property */ > - *val = -LTC2471_VREF; > + *val = -32768; > return IIO_VAL_INT; > > default: > -- > 2.50.1 >