From: Stephan Gerhold stephan@gerhold.net
commit 6e2a90af0b8d757e850cc023d761ee9a9492e2fe upstream.
According to sysfs-bus-iio documentation the unit for accelerometer values after applying scale/offset should be m/s^2, not g, which explains why the scale values for the other variants in bmc150-accel do not match exactly the values given in the datasheet.
To get the correct values, we need to multiply the BMA222 scale values by g = 9.80665 m/s^2.
Fixes: a1a210bf29a1 ("iio: accel: bmc150-accel: Add support for BMA222") Reviewed-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Stephan Gerhold stephan@gerhold.net Link: https://lore.kernel.org/r/20210611080903.14384-2-stephan@gerhold.net Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/iio/accel/bmc150-accel-core.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/iio/accel/bmc150-accel-core.c +++ b/drivers/iio/accel/bmc150-accel-core.c @@ -1177,11 +1177,12 @@ static const struct bmc150_accel_chip_in /* * The datasheet page 17 says: * 15.6, 31.3, 62.5 and 125 mg per LSB. + * IIO unit is m/s^2 so multiply by g = 9.80665 m/s^2. */ - .scale_table = { {156000, BMC150_ACCEL_DEF_RANGE_2G}, - {313000, BMC150_ACCEL_DEF_RANGE_4G}, - {625000, BMC150_ACCEL_DEF_RANGE_8G}, - {1250000, BMC150_ACCEL_DEF_RANGE_16G} }, + .scale_table = { {152984, BMC150_ACCEL_DEF_RANGE_2G}, + {306948, BMC150_ACCEL_DEF_RANGE_4G}, + {612916, BMC150_ACCEL_DEF_RANGE_8G}, + {1225831, BMC150_ACCEL_DEF_RANGE_16G} }, }, [bma222e] = { .name = "BMA222E",