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iio: fix scale application in iio_convert_raw_to_processed_unlocked

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When the scale_type is IIO_VAL_INT_PLUS_MICRO or IIO_VAL_INT_PLUS_NANO
the scale passed as argument is only applied to the fractional part of
the value. Fix it by also multiplying the integer part by the scale
provided.

Fixes: 48e44ce0f8 ("iio:inkern: Add function to read the processed value")
Signed-off-by: Matteo Martelli <matteomartelli3@gmail.com>
Link: https://patch.msgid.link/20240730-iio-fix-scale-v1-1-6246638c8daa@gmail.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Matteo Martelli 2024-07-30 10:11:53 +02:00 committed by Jonathan Cameron
parent 2f6b92d0f6
commit 8a3dcc970d
1 changed files with 4 additions and 4 deletions
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8
drivers/iio/inkern.c
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@ -647,17 +647,17 @@ static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,
break;
case IIO_VAL_INT_PLUS_MICRO:
if (scale_val2 < 0)
*processed = -raw64 * scale_val;
*processed = -raw64 * scale_val * scale;
else
*processed = raw64 * scale_val;
*processed = raw64 * scale_val * scale;
*processed += div_s64(raw64 * (s64)scale_val2 * scale,
1000000LL);
break;
case IIO_VAL_INT_PLUS_NANO:
if (scale_val2 < 0)
*processed = -raw64 * scale_val;
*processed = -raw64 * scale_val * scale;
else
*processed = raw64 * scale_val;
*processed = raw64 * scale_val * scale;
*processed += div_s64(raw64 * (s64)scale_val2 * scale,
1000000000LL);
break;