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From:   Liam Beguin <liambeguin@gmail.com>
To:     liambeguin@gmail.com, peda@axentia.se, jic23@kernel.org,
        lars@metafoo.de, pmeerw@pmeerw.net
Cc:     linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
        devicetree@vger.kernel.org, robh+dt@kernel.org
Subject: [PATCH v3 05/10] iio: afe: rescale: add INT_PLUS_{MICRO,NANO} support
Date:   Wed, 30 Jun 2021 21:00:29 -0400
Message-Id: <20210701010034.303088-6-liambeguin@gmail.com>
In-Reply-To: <20210701010034.303088-1-liambeguin@gmail.com>
References: <20210701010034.303088-1-liambeguin@gmail.com>
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From: Liam Beguin <lvb@xiphos.com>

Add IIO_VAL_INT_PLUS_{NANO,MICRO} scaling support.
Scale the integer part and the decimal parts individually and keep the
original scaling type.

Signed-off-by: Liam Beguin <lvb@xiphos.com>
---
 drivers/iio/afe/iio-rescale.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index 98bcb5d418d6..8f79c582519c 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -87,7 +87,16 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
 			do_div(tmp, 1000000000LL);
 			*val = tmp;
 			return ret;
+		case IIO_VAL_INT_PLUS_NANO:
+			fallthrough;
+		case IIO_VAL_INT_PLUS_MICRO:
+			tmp = (s64)*val * rescale->numerator;
+			*val = div_s64(tmp, rescale->denominator);
+			tmp = (s64)*val2 * rescale->numerator;
+			*val2 = div_s64(tmp, rescale->denominator);
+			return ret;
 		default:
+			dev_err(&indio_dev->dev, "unsupported type %d\n", ret);
 			return -EOPNOTSUPP;
 		}
 	default:
-- 
2.30.1.489.g328c10930387