Commit a02a8c42 authored Jan 09, 2013 by Lars-Peter Clausen Committed by Jonathan Cameron Jan 09, 2013

staging:iio:adis16080: Perform sign extension



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>

parent 7b7a4efe

drivers/staging/iio/gyro/adis16080_core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -69,7 +69,7 @@ static int adis16080_spi_read(struct iio_dev *indio_dev,
		ret = spi_read(st->us, st->buf, 2);

		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);

		return ret;