From: Liam Beguin <lvb@xxxxxxxxxx> The IIO_VAL_FRACTIONAL_LOG2 scale type doesn't return the expected scale. Update the case so that the rescaler returns a fractional type and a more precise scale. Signed-off-by: Liam Beguin <lvb@xxxxxxxxxx> --- drivers/iio/afe/iio-rescale.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c index 35fa3b4e53e0..47cd4a6d9aca 100644 --- a/drivers/iio/afe/iio-rescale.c +++ b/drivers/iio/afe/iio-rescale.c @@ -44,12 +44,9 @@ int rescale_process_scale(struct rescale *rescale, int scale_type, *val2 = rescale->denominator; return IIO_VAL_FRACTIONAL; case IIO_VAL_FRACTIONAL_LOG2: - tmp = *val * 1000000000LL; - do_div(tmp, rescale->denominator); - tmp *= rescale->numerator; - do_div(tmp, 1000000000LL); - *val = tmp; - return scale_type; + *val = rescale->numerator * *val; + *val2 = rescale->denominator * (1 << *val2); + return IIO_VAL_FRACTIONAL; case IIO_VAL_INT_PLUS_NANO: tmp = ((s64)*val * 1000000000LL + *val2) * rescale->numerator; tmp = div_s64(tmp, rescale->denominator); -- 2.30.1.489.g328c10930387
