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iio: imu: inv_icm42600: Fix temperature calculation

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commit e2f820014239df9360064079ae93f838ff3b7f8c upstream.

>From the documentation:
"offset to be added to <type>[Y]_raw prior toscaling by <type>[Y]_scale"
Offset should be applied before multiplying scale, so divide offset by
scale to make this correct.

Fixes: bc3eb0207f ("iio: imu: inv_icm42600: add temperature sensor support")
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Acked-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://patch.msgid.link/20250502-imu-v1-1-129b8391a4e3@geanix.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Nyekjaer
2025-05-02 11:37:26 +02:00
committed by Greg Kroah-Hartman
parent fe68429041
commit f6a5b84f45
1 changed files with 5 additions and 3 deletions
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8
drivers/iio/imu/inv_icm42600/inv_icm42600_temp.c
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@@ -67,16 +67,18 @@ int inv_icm42600_temp_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT; return IIO_VAL_INT;
/* /*
* T°C = (temp / 132.48) + 25 * T°C = (temp / 132.48) + 25
* Tm°C = 1000 * ((temp * 100 / 13248) + 25) * Tm°C = 1000 * ((temp / 132.48) + 25)
* Tm°C = 7.548309 * temp + 25000
* Tm°C = (temp + 3312) * 7.548309
* scale: 100000 / 13248 ~= 7.548309 * scale: 100000 / 13248 ~= 7.548309
* offset: 25000 * offset: 3312
*/ */
case IIO_CHAN_INFO_SCALE: case IIO_CHAN_INFO_SCALE:
*val = 7; *val = 7;
*val2 = 548309; *val2 = 548309;
return IIO_VAL_INT_PLUS_MICRO; return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_OFFSET: case IIO_CHAN_INFO_OFFSET:
*val = 25000; *val = 3312;
return IIO_VAL_INT; return IIO_VAL_INT;
default: default:
return -EINVAL; return -EINVAL;