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iio: imu: inv_icm45600: fix temperature offset reporting

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Correct temperature computation is (raw + offset) * scale and not
apply scale and offset afterward.
Fix temperature offset reporting to the correct value and update
commentaries for the new computation.

Fixes: 27e072bc34 ("iio: imu: inv_icm45600: add IMU IIO gyroscope device")
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jean-Baptiste Maneyrol 2025-12-18 11:30:59 +01:00 committed by Jonathan Cameron
parent ea6b4feba8
commit 943cbf9069
1 changed files with 5 additions and 4 deletions
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9
drivers/iio/imu/inv_icm45600/inv_icm45600_core.c
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@ -960,16 +960,17 @@ int inv_icm45600_temp_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
/*
* T°C = (temp / 128) + 25
* Tm°C = 1000 * ((temp * 100 / 12800) + 25)
* scale: 100000 / 13248 = 7.8125
* offset: 25000
* Tm°C = ((temp + 25 * 128) / 128)) * 1000
* Tm°C = (temp + 3200) * (1000 / 128)
* scale: 1000 / 128 = 7.8125
* offset: 3200
*/
case IIO_CHAN_INFO_SCALE:
*val = 7;
*val2 = 812500;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_OFFSET:
*val = 25000;
*val = 3200;
return IIO_VAL_INT;
default:
return -EINVAL;