From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp-out-052.synserver.de ([212.40.185.52]:1033 "EHLO smtp-out-052.synserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757778Ab3AIOAo (ORCPT ); Wed, 9 Jan 2013 09:00:44 -0500 From: Lars-Peter Clausen To: Jonathan Cameron Cc: linux-iio@vger.kernel.org, Lars-Peter Clausen Subject: [PATCH 1/7] staging:iio:adis16080: Perform sign extension Date: Wed, 9 Jan 2013 15:01:13 +0100 Message-Id: <1357740079-12326-1-git-send-email-lars@metafoo.de> Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org 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 --- This one should go into 3.8 if possible, the rest of the series is for 3.9 --- drivers/staging/iio/gyro/adis16080_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/iio/gyro/adis16080_core.c b/drivers/staging/iio/gyro/adis16080_core.c index 3525a68..149ff99 100644 --- a/drivers/staging/iio/gyro/adis16080_core.c +++ b/drivers/staging/iio/gyro/adis16080_core.c @@ -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(12, ((st->buf[0] & 0xF) << 8) | st->buf[1]); mutex_unlock(&st->buf_lock); return ret; -- 1.8.0