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    Subject[PATCH 5.10 284/545] iio: accel: bma400: Fix the scale min and max macro values
    Date
    From: Jagath Jog J <jagathjog1996@gmail.com>

    [ 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>
    ---
    drivers/iio/accel/bma400.h | 23 +++++++++++++++++++++--
    1 file 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
    --
    2.35.1


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