Commit 6e2a90af authored by Stephan Gerhold's avatar Stephan Gerhold Committed by Jonathan Cameron
Browse files

iio: accel: bmc150: Fix bma222 scale unit 



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: a1a210bf ("iio: accel: bmc150-accel: Add support for BMA222")
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarStephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20210611080903.14384-2-stephan@gerhold.net


Cc: <Stable@vger.kernel.org>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 94588c1b

drivers/iio/accel/bmc150-accel-core.c

+5 −4
Original line number Diff line number Diff line
@@ -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",