diff options
| author | Jagath Jog J <jagathjog1996@gmail.com> | 2022-05-05 19:00:12 +0530 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-06-11 14:35:25 +0100 |
| commit | 747c7cf1592e226d40543231b26502b332d0ea2f (patch) | |
| tree | e72fd7e17edd539c18b333f7da5b6767cb50ac45 /drivers/iio/accel/bma400.h | |
| parent | 8dc0a72795e49abcda576ecb18072d1b91082711 (diff) | |
| download | linux-747c7cf1592e226d40543231b26502b332d0ea2f.tar.bz2 | |
iio: accel: bma400: Fix the scale min and max macro values
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>
Diffstat (limited to 'drivers/iio/accel/bma400.h')
| -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 c4c8d74155c2..80330c7ce17f 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 |