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staging:iio:adis16080: Perform sign extension

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The adis16080 reports sample values in twos complement. So we need to perform a
sign extension on the result, otherwise negative values will be reported
incorrectly as large positive values.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2013-01-09 14:01:00 +00:00 • committed by Jonathan Cameron
parent 7b7a4efe76
commit a02a8c42b5
1 changed files with 1 additions and 1 deletions
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drivers/staging/iio/gyro/adis16080_core.c
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@ -69,7 +69,7 @@ static int adis16080_spi_read(struct iio_dev *indio_dev,
ret = spi_read(st->us, st->buf, 2); ret = spi_read(st->us, st->buf, 2);
if (ret == 0) if (ret == 0)
*val = ((st->buf[0] & 0xF) << 8) | st->buf[1]; *val = sign_extend32(((st->buf[0] & 0xF) << 8) | st->buf[1], 11);
mutex_unlock(&st->buf_lock); mutex_unlock(&st->buf_lock);
return ret; return ret;