From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from 132.79-246-81.adsl-static.isp.belgacom.be ([81.246.79.132]:45405 "EHLO viper.mind.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753114AbbC3IfS (ORCPT ); Mon, 30 Mar 2015 04:35:18 -0400 From: =?UTF-8?q?Vianney=20le=20Cl=C3=A9ment=20de=20Saint-Marcq?= To: linux-iio@vger.kernel.org Cc: =?UTF-8?q?Vianney=20le=20Cl=C3=A9ment=20de=20Saint-Marcq?= , "Arnout Vandecappelle (Essensium/Mind)" Subject: [PATCH v3 5/5] iio: mlx90614: Check for errors in read values Date: Mon, 30 Mar 2015 10:35:02 +0200 Message-Id: <1427704502-22347-6-git-send-email-vianney.leclement@essensium.com> In-Reply-To: <1427704502-22347-1-git-send-email-vianney.leclement@essensium.com> References: <1427704502-22347-1-git-send-email-vianney.leclement@essensium.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org The device uses the MSB of the returned temperature value as an error flag. Return a read error when this bit is set. Signed-off-by: Vianney le Clément de Saint-Marcq Cc: Arnout Vandecappelle (Essensium/Mind) --- v3: return -EIO instead of -EREMOTEIO v2: new patch --- drivers/iio/temperature/mlx90614.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c index 73ec767..06b7b96 100644 --- a/drivers/iio/temperature/mlx90614.c +++ b/drivers/iio/temperature/mlx90614.c @@ -196,6 +196,11 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev, if (ret < 0) return ret; + + /* MSB is an error flag */ + if (ret & 0x8000) + return -EIO; + *val = ret; return IIO_VAL_INT; case IIO_CHAN_INFO_OFFSET: -- 2.3.4