Commit 2acd0313 authored by Carlos Song's avatar Carlos Song Committed by Jonathan Cameron
Browse files

iio: imu: fxos8700: fix MAGN sensor scale and unit 



+/-1200uT is a MAGN sensor full measurement range. Magnetometer scale
is the magnetic sensitivity parameter. It is referenced as 0.1uT
according to datasheet and magnetometer channel unit is Gauss in
sysfs-bus-iio documentation. Gauss and uTesla unit conversion
relationship as follows: 0.1uT = 0.001Gs.

Set magnetometer scale and available magnetometer scale as fixed 0.001Gs.

Fixes: 84e5ddd5 ("iio: imu: Add support for the FXOS8700 IMU")
Signed-off-by: default avatarCarlos Song <carlos.song@nxp.com>
Link: https://lore.kernel.org/r/20230118074227.1665098-5-carlos.song@nxp.com


Cc: <Stable@vger.kernel.org>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent ff5e2cd9

drivers/iio/imu/fxos8700_core.c

+3 −3
Original line number Diff line number Diff line
@@ -351,7 +351,7 @@ static int fxos8700_set_scale(struct fxos8700_data *data, 
	struct device *dev = regmap_get_device(data->regmap);



	if (t == FXOS8700_MAGN) {

		dev_err(dev, "Magnetometer scale is locked at 1200uT\n");

		dev_err(dev, "Magnetometer scale is locked at 0.001Gs\n");

		return -EINVAL;

	}
@@ -396,7 +396,7 @@ static int fxos8700_get_scale(struct fxos8700_data *data, 
	static const int scale_num = ARRAY_SIZE(fxos8700_accel_scale);



	if (t == FXOS8700_MAGN) {

		*uscale = 1200; /* Magnetometer is locked at 1200uT */

		*uscale = 1000; /* Magnetometer is locked at 0.001Gs */

		return 0;

	}
@@ -588,7 +588,7 @@ static IIO_CONST_ATTR(in_accel_sampling_frequency_available, 
static IIO_CONST_ATTR(in_magn_sampling_frequency_available,

		      "1.5625 6.25 12.5 50 100 200 400 800");

static IIO_CONST_ATTR(in_accel_scale_available, "0.000244 0.000488 0.000976");

static IIO_CONST_ATTR(in_magn_scale_available, "0.000001200");

static IIO_CONST_ATTR(in_magn_scale_available, "0.001000");



static struct attribute *fxos8700_attrs[] = {

	&iio_const_attr_in_accel_sampling_frequency_available.dev_attr.attr,