linux-kernel - [PATCH 4/4] iio: afe/rescale: Implement write

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Date:   Thu, 21 Jul 2022 20:15:26 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Jonathan Cameron <jic23@...nel.org>, Peter Rosin <peda@...ntia.se>
Cc:     Lars-Peter Clausen <lars@...afoo.de>, list@...ndingux.net,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 4/4] iio: afe/rescale: Implement write_raw

Implement write_raw by converting the value if writing the scale, or
just calling the managed channel driver's write_raw otherwise.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/iio/afe/iio-rescale.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index 5c9970b93384..0edb62ee4508 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -141,6 +141,27 @@ int rescale_process_offset(struct rescale *rescale, int scale_type,
 	}
 }
 
+static int rescale_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct rescale *rescale = iio_priv(indio_dev);
+	unsigned long long tmp;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		tmp = val * 1000000000LL;
+		do_div(tmp, rescale->numerator);
+		tmp *= rescale->denominator;
+		do_div(tmp, 1000000000LL);
+		return iio_write_channel_attribute(rescale->source, tmp, 0,
+						   IIO_CHAN_INFO_SCALE);
+	default:
+		return iio_write_channel_attribute(rescale->source,
+						   val, val2, mask);
+	}
+}
+
 static int rescale_read_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
 			    int *val, int *val2, long mask)
@@ -250,6 +271,7 @@ static int rescale_read_avail(struct iio_dev *indio_dev,
 }
 
 static const struct iio_info rescale_info = {
+	.write_raw = rescale_write_raw,
 	.read_raw = rescale_read_raw,
 	.read_avail = rescale_read_avail,
 };
-- 
2.35.1