From 8f89e33bf040bbef66386c426198622180233178 Mon Sep 17 00:00:00 2001
From: Marcus Folkesson <marcus.folkesson@gmail.com>
Date: Fri, 22 Jul 2022 15:07:18 +0200
Subject: [PATCH] iio: adc: mcp3911: make use of the sign bit
Git-commit: 8f89e33bf040bbef66386c426198622180233178
Patch-mainline: v6.0-rc4
References: git-fixes
The device supports negative values as well.
Fixes: 3a89b289df5d ("iio: adc: add support for mcp3911")
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220722130726.7627-2-marcus.folkesson@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/iio/adc/mcp3911.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iio/adc/mcp3911.c b/drivers/iio/adc/mcp3911.c
index 1cb4590fe412..f581cefb6719 100644
--- a/drivers/iio/adc/mcp3911.c
+++ b/drivers/iio/adc/mcp3911.c
@@ -113,6 +113,8 @@ static int mcp3911_read_raw(struct iio_dev *indio_dev,
if (ret)
goto out;
+ *val = sign_extend32(*val, 23);
+
ret = IIO_VAL_INT;
break;
--
2.35.3