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From:   Karim Eshapa <karim.eshapa@gmail.com>
To:     lars@metafoo.de
Cc:     Michael.Hennerich@analog.com, jic23@kernel.org, knaack.h@gmx.de,
        pmeerw@pmeerw.net, gregkh@linuxfoundation.org,
        linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
        linux-kernel@vger.kernel.org, Karim Eshapa <karim.eshapa@gmail.com>
Subject: Re: [PATCH] staging:iio:accel:adis16240: sign extend function avoiding code  duplication
Date:   Tue, 12 Jun 2018 02:57:48 +0200
Message-Id: <20180612005748.3546-1-karim.eshapa@gmail.com>
In-Reply-To: <48143872d69d231273bd2c8ed835cbf0046a263d.camel@perches.com>
References: <48143872d69d231273bd2c8ed835cbf0046a263d.camel@perches.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Use sign_extend32 kernel function instead of code duplication.
Safe also for 16 bit.

Signed-off-by: Karim Eshapa <karim.eshapa@gmail.com>
---
 drivers/staging/iio/accel/adis16240.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/iio/accel/adis16240.c b/drivers/staging/iio/accel/adis16240.c
index fff6d99089cc..24e525f1ef25 100644
--- a/drivers/staging/iio/accel/adis16240.c
+++ b/drivers/staging/iio/accel/adis16240.c
@@ -250,7 +250,6 @@ static int adis16240_read_raw(struct iio_dev *indio_dev,
 {
 	struct adis *st = iio_priv(indio_dev);
 	int ret;
-	int bits;
 	u8 addr;
 	s16 val16;
 
@@ -287,24 +286,18 @@ static int adis16240_read_raw(struct iio_dev *indio_dev,
 		*val = 25000 / 244 - 0x133; /* 25 C = 0x133 */
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_CALIBBIAS:
-		bits = 10;
 		addr = adis16240_addresses[chan->scan_index][0];
 		ret = adis_read_reg_16(st, addr, &val16);
 		if (ret)
 			return ret;
-		val16 &= (1 << bits) - 1;
-		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
-		*val = val16;
+		*val = sign_extend32(val16, 9);
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_PEAK:
-		bits = 10;
 		addr = adis16240_addresses[chan->scan_index][1];
 		ret = adis_read_reg_16(st, addr, &val16);
 		if (ret)
 			return ret;
-		val16 &= (1 << bits) - 1;
-		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
-		*val = val16;
+		*val = sign_extend32(val16, 9);
 		return IIO_VAL_INT;
 	}
 	return -EINVAL;
-- 
2.17.1