From 88198d2b4238b8f711918abe5e2b9bd7efc7c775 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Fri, 14 Jun 2013 16:58:00 +0100 Subject: staging:iio:ad7291: Use sign_extend32 instead of open-coding it This makes it a bit more obvious what is going on than open-coding it. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron --- drivers/staging/iio/adc/ad7291.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/staging/iio/adc/ad7291.c b/drivers/staging/iio/adc/ad7291.c index 2a7e6a77a46b..c2709d68af69 100644 --- a/drivers/staging/iio/adc/ad7291.c +++ b/drivers/staging/iio/adc/ad7291.c @@ -275,7 +275,6 @@ static int ad7291_read_event_value(struct iio_dev *indio_dev, struct ad7291_chip_info *chip = iio_priv(indio_dev); int ret; u16 uval; - s16 signval; ret = ad7291_i2c_read(chip, ad7291_threshold_reg(event_code), &uval); if (ret < 0) @@ -286,8 +285,7 @@ static int ad7291_read_event_value(struct iio_dev *indio_dev, *val = uval & AD7291_VALUE_MASK; return 0; case IIO_TEMP: - signval = (s16)((uval & AD7291_VALUE_MASK) << 4) >> 4; - *val = signval; + *val = sign_extend32(uval, 11); return 0; default: return -EINVAL; @@ -397,7 +395,6 @@ static int ad7291_read_raw(struct iio_dev *indio_dev, int ret; struct ad7291_chip_info *chip = iio_priv(indio_dev); u16 regval; - s16 signval; switch (mask) { case IIO_CHAN_INFO_RAW: @@ -433,8 +430,7 @@ static int ad7291_read_raw(struct iio_dev *indio_dev, AD7291_T_SENSE); if (ret < 0) return ret; - signval = (s16)((ret & AD7291_VALUE_MASK) << 4) >> 4; - *val = signval; + *val = sign_extend32(ret, 11); return IIO_VAL_INT; default: return -EINVAL; @@ -444,8 +440,7 @@ static int ad7291_read_raw(struct iio_dev *indio_dev, AD7291_T_AVERAGE); if (ret < 0) return ret; - signval = (s16)((ret & AD7291_VALUE_MASK) << 4) >> 4; - *val = signval; + *val = sign_extend32(ret, 11); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: switch (chan->type) { -- cgit v1.2.3