linux-kernel - [PATCH 1/3] iio: core: Introduce IIO_CHAN_INFO

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Message-Id: <1429267830-13681-2-git-send-email-irina.tirdea@intel.com>
Date:	Fri, 17 Apr 2015 13:50:28 +0300
From:	Irina Tirdea <irina.tirdea@...el.com>
To:	Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Irina Tirdea <irina.tirdea@...el.com>
Subject: [PATCH 1/3] iio: core: Introduce IIO_CHAN_INFO_CALIBREPETITIONS

Some magnetometers can perform a number of repetitions in HW
for each measurement to increase accuracy. One example is
Bosch BMC150:
http://ae-bst.resource.bosch.com/media/products/dokumente/bmc150/BST-BMC150-DS000-04.pdf.

Introduce an interface to set the number of repetitions
for these devices.

Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 10 ++++++++++
 drivers/iio/industrialio-core.c         |  1 +
 include/linux/iio/iio.h                 |  1 +
 3 files changed, 12 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 866b4ec..74c1444 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1375,3 +1375,13 @@ Description:
 		The emissivity ratio of the surface in the field of view of the
 		contactless temperature sensor.  Emissivity varies from 0 to 1,
 		with 1 being the emissivity of a black body.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_magn_x_calibrepetitions
+What:		/sys/bus/iio/devices/iio:deviceX/in_magn_y_calibrepetitions
+What:		/sys/bus/iio/devices/iio:deviceX/in_magn_z_calibrepetitions
+KernelVersion:	4.2
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Hardware applied number of repetitions for acquiring one
+		data point. The HW will do <type>[_name]_calibrepetitions
+		measurements and return the average value as output data.
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 7c98bc1..9e0da7f 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -129,6 +129,7 @@ static const char * const iio_chan_info_postfix[] = {
 	[IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
 	[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
 	[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
+	[IIO_CHAN_INFO_CALIBREPETITIONS] = "calibrepetitions",
 };
 
 /**
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index b1e46ae..07fbfb2 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -44,6 +44,7 @@ enum iio_chan_info_enum {
 	IIO_CHAN_INFO_DEBOUNCE_COUNT,
 	IIO_CHAN_INFO_DEBOUNCE_TIME,
 	IIO_CHAN_INFO_CALIBEMISSIVITY,
+	IIO_CHAN_INFO_CALIBREPETITIONS,
 };
 
 enum iio_shared_by {
-- 
1.9.1

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