Message ID | 9879beec-05fc-4fc6-af62-d771e238954e@wolfvision.net |
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[v2] iio: tmag5273: fix temperature offset
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Commit Message
Javier Carrasco
Nov. 21, 2023, 5:48 a.m. UTC
The current offset has the scale already applied to it. The ABI
documentation defines the offset parameter as "offset to be added
to <type>[Y]_raw prior to scaling by <type>[Y]_scale in order to
obtain value in the <type> units as specified in <type>[Y]_raw
documentation"
The right value is obtained at 0 degrees Celsius by the formula provided
in the datasheet:
T = Tsens_t0 + (Tadc_t - Tadc_t0) / Tadc_res
where:
T = 0 degrees Celsius
Tsens_t0 (reference temperature) = 25 degrees Celsius
Tadc_t0 (16-bit format for Tsens_t0) = 17508
Tadc_res = 60.1 LSB/degree Celsius
The resulting offset is 16005.5, which has been truncated to 16005 to
provide an integer value with a precision loss smaller than the 1-LSB
measurement precision.
Fix the offset to apply its value prior to scaling.
Signed-off-by: Javier Carrasco <javier.carrasco@wolfvision.net>
---
Changes in v2:
- Fixed typo in the offset value (16005 instead of 16605) (Jonathan Cameron)
- Link to v1:
https://lore.kernel.org/r/20231023-topic-tmag5273x1_temp_offset-v1-1-983dca43292c@wolfvision.net
---
drivers/iio/magnetometer/tmag5273.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
---
base-commit: 05d3ef8bba77c1b5f98d941d8b2d4aeab8118ef1
change-id: 20231023-topic-tmag5273x1_temp_offset-17774cbce961
Best regards,
Comments
On Tue, 21 Nov 2023 06:48:39 +0100 Javier Carrasco <javier.carrasco@wolfvision.net> wrote: > The current offset has the scale already applied to it. The ABI > documentation defines the offset parameter as "offset to be added > to <type>[Y]_raw prior to scaling by <type>[Y]_scale in order to > obtain value in the <type> units as specified in <type>[Y]_raw > documentation" > > The right value is obtained at 0 degrees Celsius by the formula provided > in the datasheet: > > T = Tsens_t0 + (Tadc_t - Tadc_t0) / Tadc_res > > where: > T = 0 degrees Celsius > Tsens_t0 (reference temperature) = 25 degrees Celsius > Tadc_t0 (16-bit format for Tsens_t0) = 17508 > Tadc_res = 60.1 LSB/degree Celsius > > The resulting offset is 16005.5, which has been truncated to 16005 to > provide an integer value with a precision loss smaller than the 1-LSB > measurement precision. > > Fix the offset to apply its value prior to scaling. > > Signed-off-by: Javier Carrasco <javier.carrasco@wolfvision.net> Applied to the fixes-togreg branch of iio.git and marked for stable. Thanks, Jonathan > --- > Changes in v2: > - Fixed typo in the offset value (16005 instead of 16605) (Jonathan Cameron) > > - Link to v1: > https://lore.kernel.org/r/20231023-topic-tmag5273x1_temp_offset-v1-1-983dca43292c@wolfvision.net > --- > drivers/iio/magnetometer/tmag5273.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/iio/magnetometer/tmag5273.c > b/drivers/iio/magnetometer/tmag5273.c > index c5e5c4ad681e..e8c4ca142d21 100644 > --- a/drivers/iio/magnetometer/tmag5273.c > +++ b/drivers/iio/magnetometer/tmag5273.c > @@ -356,7 +356,7 @@ static int tmag5273_read_raw(struct iio_dev *indio_dev, > case IIO_CHAN_INFO_OFFSET: > switch (chan->type) { > case IIO_TEMP: > - *val = -266314; > + *val = -16005; > return IIO_VAL_INT; > default: > return -EINVAL; > > --- > base-commit: 05d3ef8bba77c1b5f98d941d8b2d4aeab8118ef1 > change-id: 20231023-topic-tmag5273x1_temp_offset-17774cbce961 > > Best regards,
diff --git a/drivers/iio/magnetometer/tmag5273.c b/drivers/iio/magnetometer/tmag5273.c index c5e5c4ad681e..e8c4ca142d21 100644 --- a/drivers/iio/magnetometer/tmag5273.c +++ b/drivers/iio/magnetometer/tmag5273.c @@ -356,7 +356,7 @@ static int tmag5273_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_OFFSET: switch (chan->type) { case IIO_TEMP: - *val = -266314; + *val = -16005; return IIO_VAL_INT; default: return -EINVAL;