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iio: iio_format_value(): Fix IIO_VAL_FRACTIONAL_LOG2 values between -1.0 and 0.0

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When formatting a value using IIO_VAL_FRACTIONAL_LOG2 and the values is
between -1 and 0 the sign is omitted.

We need the same trick as for IIO_VAL_FRACTIONAL to make sure this gets
formatted correctly.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20201215191743.2725-2-lars@metafoo.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lars-Peter Clausen 2020-12-15 20:17:42 +01:00 committed by Jonathan Cameron
parent 2646a95df9
commit 38a52cdef5
1 changed files with 4 additions and 1 deletions
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5
drivers/iio/industrialio-core.c
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@ -659,7 +659,10 @@ static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
case IIO_VAL_FRACTIONAL_LOG2:
tmp2 = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
tmp0 = (int)div_s64_rem(tmp2, 1000000000LL, &tmp1);
return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
if (tmp0 == 0 && tmp2 < 0)
return snprintf(buf, len, "-0.%09u", abs(tmp1));
else
return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
case IIO_VAL_INT_MULTIPLE:
{
int i;