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iio: accel: bmc150: Fix bma222 scale unit

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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: a1a210bf29 ("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>
This commit is contained in:
Stephan Gerhold 2021-06-11 10:08:54 +02:00 committed by Jonathan Cameron
parent 94588c1bf1
commit 6e2a90af0b
1 changed files with 5 additions and 4 deletions
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9
drivers/iio/accel/bmc150-accel-core.c
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@ -1145,11 +1145,12 @@ static const struct bmc150_accel_chip_info bmc150_accel_chip_info_tbl[] = {
/*
* 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",