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| author | Jagath Jog J <jagathjog1996@gmail.com> | 2022-05-05 16:30:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-21 16:15:54 +0300 |
| commit | 366d0123c38792906a223400e05cac70ac1982fb (patch) | |
| tree | 473edcf6a63e42d979105543cb6a2434da71a4ed /drivers/iio | |
| parent | edfa0851d8c91424e2e686456f144ba9d36c4503 (diff) | |
| download | linux-366d0123c38792906a223400e05cac70ac1982fb.tar.xz | |
iio: accel: bma400: Fix the scale min and max macro values
[ Upstream commit 747c7cf1592e226d40543231b26502b332d0ea2f ]
Changing the scale macro values to match the bma400 sensitivity
for 1 LSB of all the available ranges.
Fixes: 465c811f1f20 ("iio: accel: Add driver for the BMA400")
Signed-off-by: Jagath Jog J <jagathjog1996@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220505133021.22362-2-jagathjog1996@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/accel/bma400.h | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h index 5ad10db9819f..416090c6b1e8 100644 --- a/drivers/iio/accel/bma400.h +++ b/drivers/iio/accel/bma400.h @@ -83,8 +83,27 @@ #define BMA400_ACC_ODR_MIN_WHOLE_HZ 25 #define BMA400_ACC_ODR_MIN_HZ 12 -#define BMA400_SCALE_MIN 38357 -#define BMA400_SCALE_MAX 306864 +/* + * BMA400_SCALE_MIN macro value represents m/s^2 for 1 LSB before + * converting to micro values for +-2g range. + * + * For +-2g - 1 LSB = 0.976562 milli g = 0.009576 m/s^2 + * For +-4g - 1 LSB = 1.953125 milli g = 0.019153 m/s^2 + * For +-16g - 1 LSB = 7.8125 milli g = 0.076614 m/s^2 + * + * The raw value which is used to select the different ranges is determined + * by the first bit set position from the scale value, so BMA400_SCALE_MIN + * should be odd. + * + * Scale values for +-2g, +-4g, +-8g and +-16g are populated into bma400_scales + * array by left shifting BMA400_SCALE_MIN. + * e.g.: + * To select +-2g = 9577 << 0 = raw value to write is 0. + * To select +-8g = 9577 << 2 = raw value to write is 2. + * To select +-16g = 9577 << 3 = raw value to write is 3. + */ +#define BMA400_SCALE_MIN 9577 +#define BMA400_SCALE_MAX 76617 #define BMA400_NUM_REGULATORS 2 #define BMA400_VDD_REGULATOR 0 |