From: "Vianney le Clément de Saint-Marcq" <vianney.leclement@essensium.com>
To: linux-iio@vger.kernel.org
Cc: "Vianney le Clément de Saint-Marcq"
<vianney.leclement@essensium.com>,
"Arnout Vandecappelle (Essensium/Mind)" <arnout@mind.be>
Subject: [PATCH v3 5/5] iio: mlx90614: Check for errors in read values
Date: Mon, 30 Mar 2015 10:35:02 +0200 [thread overview]
Message-ID: <1427704502-22347-6-git-send-email-vianney.leclement@essensium.com> (raw)
In-Reply-To: <1427704502-22347-1-git-send-email-vianney.leclement@essensium.com>
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 <vianney.leclement@essensium.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
---
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
next prev parent reply other threads:[~2015-03-30 8:35 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-30 8:34 [PATCH v3 0/5] iio: mlx90614 enhancements Vianney le Clément de Saint-Marcq
2015-03-30 8:34 ` [PATCH v3 1/5] iio: core: Introduce IIO_CHAN_INFO_CALIBEMISSIVITY Vianney le Clément de Saint-Marcq
2015-04-09 14:03 ` Jonathan Cameron
2015-03-30 8:34 ` [PATCH v3 2/5] iio: mlx90614: Add devicetree bindings documentation Vianney le Clément de Saint-Marcq
2015-04-09 14:05 ` Jonathan Cameron
2015-03-30 8:35 ` [PATCH v3 3/5] iio: mlx90614: Add emissivity setting Vianney le Clément de Saint-Marcq
2015-04-09 14:07 ` Jonathan Cameron
2015-03-30 8:35 ` [PATCH v3 4/5] iio: mlx90614: Add power management Vianney le Clément de Saint-Marcq
2015-04-09 14:09 ` Jonathan Cameron
2015-03-30 8:35 ` Vianney le Clément de Saint-Marcq [this message]
2015-04-09 14:10 ` [PATCH v3 5/5] iio: mlx90614: Check for errors in read values Jonathan Cameron
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