From 45abbbdb46578f2008b24615ec1570e48880e81d Mon Sep 17 00:00:00 2001
From: ChiYuan Huang <cy_huang@richtek.com>
Date: Thu, 18 Sep 2025 11:10:59 +0800
Subject: [PATCH] iio: adc: rtq6056: Correct the sign bit index

commit 9b45744bf09fc2a3287e05287141d6e123c125a7 upstream.

The vshunt/current reported register is a signed 16bit integer. The
sign bit index should be '15', not '16'.

Fixes: 4396f45d211b ("iio: adc: Add rtq6056 support")
Reported-by: Andy Hsu <andy_ya_hsu@wiwynn.com>
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iio/adc/rtq6056.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/rtq6056.c b/drivers/iio/adc/rtq6056.c
index 56ed948a8ae10..8172ea51c52ed 100644
--- a/drivers/iio/adc/rtq6056.c
+++ b/drivers/iio/adc/rtq6056.c
@@ -300,7 +300,7 @@ static int rtq6056_adc_read_channel(struct rtq6056_priv *priv,
 		return IIO_VAL_INT;
 	case RTQ6056_REG_SHUNTVOLT:
 	case RTQ6056_REG_CURRENT:
-		*val = sign_extend32(regval, 16);
+		*val = sign_extend32(regval, 15);
 		return IIO_VAL_INT;
 	default:
 		return -EINVAL;
-- 
2.47.3