staging:iio:accel:adis16203: sign extend function rather code duplication

Use sign_extend32 kernel function instead of code duplication.
This function is also safe for 16 bits.

Signed-off-by: Karim Eshapa <karim.eshapa@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/staging/iio/accel/adis16203.c b/drivers/staging/iio/accel/adis16203.c
index b3e4571340ab4a4135c3ddfeda5d29c429921e41..5cc96c8086b59aa084aa049b6367c97df7d7a68f 100644 (file)
--- a/drivers/staging/iio/accel/adis16203.c
+++ b/drivers/staging/iio/accel/adis16203.c
@@ -168,7 +168,6 @@ static int adis16203_read_raw(struct iio_dev *indio_dev,
 {
        struct adis *st = iio_priv(indio_dev);
        int ret;
-       int bits;
        u8 addr;
        s16 val16;
 
@@ -202,14 +201,11 @@ static int adis16203_read_raw(struct iio_dev *indio_dev,
                *val = 25000 / -470 - 1278; /* 25 C = 1278 */
                return IIO_VAL_INT;
        case IIO_CHAN_INFO_CALIBBIAS:
-               bits = 14;
                addr = adis16203_addresses[chan->scan_index];
                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, 13);
                return IIO_VAL_INT;
        default:
                return -EINVAL;