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

commit 2acd031347 upstream.

+/-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: 84e5ddd5c4 ("iio: imu: Add support for the FXOS8700 IMU")
Signed-off-by: Carlos 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: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Carlos Song 2023-01-18 15:42:27 +08:00 committed by Greg Kroah-Hartman
parent ad3c145485
commit 4092267ad6
1 changed files with 3 additions and 3 deletions
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6
drivers/iio/imu/fxos8700_core.c
View File

@ -351,7 +351,7 @@ static int fxos8700_set_scale(struct fxos8700_data *data,
struct device *dev = regmap_get_device(data->regmap); struct device *dev = regmap_get_device(data->regmap);
if (t == FXOS8700_MAGN) { 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; 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); static const int scale_num = ARRAY_SIZE(fxos8700_accel_scale);
if (t == FXOS8700_MAGN) { if (t == FXOS8700_MAGN) {
*uscale = 1200; /* Magnetometer is locked at 1200uT */ *uscale = 1000; /* Magnetometer is locked at 0.001Gs */
return 0; return 0;
} }
@ -588,7 +588,7 @@ static IIO_CONST_ATTR(in_accel_sampling_frequency_available,
static IIO_CONST_ATTR(in_magn_sampling_frequency_available, static IIO_CONST_ATTR(in_magn_sampling_frequency_available,
"1.5625 6.25 12.5 50 100 200 400 800"); "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_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[] = { static struct attribute *fxos8700_attrs[] = {
&iio_const_attr_in_accel_sampling_frequency_available.dev_attr.attr, &iio_const_attr_in_accel_sampling_frequency_available.dev_attr.attr,