From: ChiYuan Huang <cy_huang@richtek.com>
Date: Mon, 1 Dec 2025 21:23:04 +0000 (-0500)
Subject: iio: adc: rtq6056: Correct the sign bit index
X-Git-Tag: v6.1.159~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f3b4e06e0fe0976c7e57ef8cbc0f10944c28998e;p=thirdparty%2Fkernel%2Fstable.git

iio: adc: rtq6056: Correct the sign bit index

[ Upstream commit 9b45744bf09fc2a3287e05287141d6e123c125a7 ]

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>
[ adapted switch statement to existing if-else structure for sign_extend32() fix ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/iio/adc/rtq6056.c b/drivers/iio/adc/rtq6056.c
index c1b2e8dc9a266..04ce542f8ab3f 100644
--- a/drivers/iio/adc/rtq6056.c
+++ b/drivers/iio/adc/rtq6056.c
@@ -171,7 +171,7 @@ static int rtq6056_adc_read_channel(struct rtq6056_priv *priv,
 	if (addr == RTQ6056_REG_BUSVOLT || addr == RTQ6056_REG_POWER)
 		*val = regval;
 	else
-		*val = sign_extend32(regval, 16);
+		*val = sign_extend32(regval, 15);
 
 	return IIO_VAL_INT;
 }