The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x 8236644f5ecb180e80ad92d691c22bc509b747bb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025041759-dreamlike-hardener-e878@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8236644f5ecb180e80ad92d691c22bc509b747bb Mon Sep 17 00:00:00 2001 From: Sergiu Cuciurean sergiu.cuciurean@analog.com Date: Thu, 6 Mar 2025 18:00:29 -0300 Subject: [PATCH] iio: adc: ad7768-1: Fix conversion result sign
The ad7768-1 ADC output code is two's complement, meaning that the voltage conversion result is a signed value.. Since the value is a 24 bit one, stored in a 32 bit variable, the sign should be extended in order to get the correct representation.
Also the channel description has been updated to signed representation, to match the ADC specifications.
Fixes: a5f8c7da3dbe ("iio: adc: Add AD7768-1 ADC basic support") Reviewed-by: David Lechner dlechner@baylibre.com Reviewed-by: Marcelo Schmitt marcelo.schmitt@analog.com Signed-off-by: Sergiu Cuciurean sergiu.cuciurean@analog.com Signed-off-by: Jonathan Santos Jonathan.Santos@analog.com Cc: Stable@vger.kernel.org Link: https://patch.msgid.link/505994d3b71c2aa38ba714d909a68e021f12124c.1741268122... Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com
diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c index ea829c51e80b..09e7cccfd51c 100644 --- a/drivers/iio/adc/ad7768-1.c +++ b/drivers/iio/adc/ad7768-1.c @@ -142,7 +142,7 @@ static const struct iio_chan_spec ad7768_channels[] = { .channel = 0, .scan_index = 0, .scan_type = { - .sign = 'u', + .sign = 's', .realbits = 24, .storagebits = 32, .shift = 8, @@ -373,7 +373,7 @@ static int ad7768_read_raw(struct iio_dev *indio_dev, iio_device_release_direct(indio_dev); if (ret < 0) return ret; - *val = ret; + *val = sign_extend32(ret, chan->scan_type.realbits - 1);
return IIO_VAL_INT;