linux-kernel - [PATCH v2 5/8] iio: afe: rescale: add upstream offset support

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Date:   Mon,  7 Jun 2021 10:47:15 -0400
From:   Liam Beguin <liambeguin@...il.com>
To:     liambeguin@...il.com, peda@...ntia.se, jic23@...nel.org,
        lars@...afoo.de, pmeerw@...erw.net
Cc:     linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org
Subject: [PATCH v2 5/8] iio: afe: rescale: add upstream offset support

From: Liam Beguin <lvb@...hos.com>

Default to using iio_read_channel_processed() if the upstream channel
exposes an offset.

When possible, it's preferable to avoid using
iio_read_channel_processed() to maintain as much precision as possible.

Signed-off-by: Liam Beguin <lvb@...hos.com>
---
 drivers/iio/afe/iio-rescale.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index 774eb3044edd..e34148d39b39 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -148,7 +148,10 @@ static int rescale_configure_channel(struct device *dev,
 	chan->ext_info = rescale->ext_info;
 	chan->type = rescale->cfg->type;
 
-	if (iio_channel_has_info(schan, IIO_CHAN_INFO_RAW) ||
+	if (iio_channel_has_info(schan, IIO_CHAN_INFO_OFFSET)) {
+		dev_info(dev, "found upstream offset, using processed value\n");
+		rescale->chan_processed = true;
+	} else if (iio_channel_has_info(schan, IIO_CHAN_INFO_RAW) ||
 	    iio_channel_has_info(schan, IIO_CHAN_INFO_SCALE)) {
 		dev_info(dev, "using raw+scale source channel\n");
 	} else if (iio_channel_has_info(schan, IIO_CHAN_INFO_PROCESSED)) {
-- 
2.30.1.489.g328c10930387