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From: Irina Tirdea <irina.tirdea@intel.com>
To: Jonathan Cameron <jic23@kernel.org>, linux-iio@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, Vlad Dogaru <vlad.dogaru@intel.com>,
	Daniel Baluta <daniel.baluta@intel.com>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald <pmeerw@pmeerw.net>,
	Irina Tirdea <irina.tirdea@intel.com>
Subject: [PATCH v2 07/10] iio: core: Introduce IIO_CHAN_INFO_FILTER_OUTLIERS_THRESH and _PERIOD
Date: Sun, 11 Jan 2015 21:10:13 +0200	[thread overview]
Message-ID: <1421003416-27557-8-git-send-email-irina.tirdea@intel.com> (raw)
In-Reply-To: <1421003416-27557-1-git-send-email-irina.tirdea@intel.com>

The pedometer needs to filter out false steps that might be generated by
tapping the foot, sitting, etc. To do that it computes the number of
steps that occur in a given time and decides the user is moving only
if this value is over a threshold. E.g.: the user starts moving only
if he takes 4 steps in 3 seconds. This filter is applied only when
the user starts moving.

A device that has such pedometer functionality is Freescale's MMA9553L:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf.

To export this feature, this patch introduces
IIO_CHAN_INFO_FILTER_OUTLIERS_THRESH and IIO_CHAN_INFO_FILTER_OUTLIERS_PERIOD.
For the pedometer, in_steps_filter_outlier_thresh will specify the number of
steps that need to occur in in_steps_filter_outlier_period seconds so that
the pedometer decides the user is moving.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 21 +++++++++++++++++++++
 drivers/iio/industrialio-core.c         |  2 ++
 include/linux/iio/iio.h                 |  2 ++
 3 files changed, 25 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index c03a140..e009f49 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1193,3 +1193,24 @@ Description:
 		This attribute is used to read the current speed value of the
 		user (which is the norm or magnitude of the velocity vector).
 		Units after application of scale are m/s.
+
+What:		/sys/.../iio:deviceX/in_steps_filter_outliers_period
+KernelVersion:	3.20
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Specifies the number of seconds in which we compute the
+		values so we can decide if they are outlier values and
+		need to be filter out. These computed values are then
+		compared with in_steps_filter_outliers_thresh. E.g. for steps:
+		specifies number of seconds in which we compute the steps
+		that occur in order to decide if the consumer is making steps.
+
+What:		/sys/.../iio:deviceX/in_steps_filter_outliers_thresh
+KernelVersion:	3.20
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Specifies a threshold for filtering outlier values: if value
+		measured in in_steps_filter_outliers_period seconds is below
+		threshold, we filter it out. E.g. for steps: specifies number
+		of steps that must occur within in_steps_filter_outliers_period
+		for the pedometer to decide the consumer is making steps.
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 4ee6fdf..81678b3 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -126,6 +126,8 @@ static const char * const iio_chan_info_postfix[] = {
 	[IIO_CHAN_INFO_ENABLE] = "en",
 	[IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
 	[IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
+	[IIO_CHAN_INFO_FILTER_OUTLIERS_THRESH] = "filter_outliers_thresh",
+	[IIO_CHAN_INFO_FILTER_OUTLIERS_PERIOD] = "filter_outliers_period",
 };
 
 /**
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 752a929..b6b12ac 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -41,6 +41,8 @@ enum iio_chan_info_enum {
 	IIO_CHAN_INFO_ENABLE,
 	IIO_CHAN_INFO_CALIBHEIGHT,
 	IIO_CHAN_INFO_CALIBWEIGHT,
+	IIO_CHAN_INFO_FILTER_OUTLIERS_THRESH,
+	IIO_CHAN_INFO_FILTER_OUTLIERS_PERIOD,
 };
 
 enum iio_shared_by {
-- 
1.9.1


  parent reply	other threads:[~2015-01-11 19:12 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-11 19:10 [PATCH v2 00/10] Add MMA9553 driver & PM support for MMA9551 Irina Tirdea
2015-01-11 19:10 ` [PATCH v2 01/10] iio: core: Introduce ENERGY channel type Irina Tirdea
2015-01-25 22:58   ` Jonathan Cameron
2015-03-29  0:14   ` Hartmut Knaack
2015-03-30 11:18     ` Tirdea, Irina
2015-01-11 19:10 ` [PATCH v2 02/10] iio: core: Introduce DISTANCE " Irina Tirdea
2015-01-25 22:59   ` Jonathan Cameron
2015-01-11 19:10 ` [PATCH v2 03/10] iio: core: Introduce IIO_VELOCITY and IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z Irina Tirdea
2015-01-25 23:00   ` Jonathan Cameron
2015-01-11 19:10 ` [PATCH v2 04/10] iio: core: Introduce IO_CHAN_INFO_CALIBWEIGHT Irina Tirdea
2015-01-25 23:01   ` Jonathan Cameron
2015-01-11 19:10 ` [PATCH v2 05/10] iio: core: Introduce CHANGE event type Irina Tirdea
2015-01-25 23:03   ` Jonathan Cameron
2015-01-11 19:10 ` [PATCH v2 06/10] iio: core: Remove IIO_EV_TYPE_INSTANCE Irina Tirdea
2015-01-26 19:04   ` Jonathan Cameron
2015-01-11 19:10 ` Irina Tirdea [this message]
2015-01-25 23:07   ` [PATCH v2 07/10] iio: core: Introduce IIO_CHAN_INFO_FILTER_OUTLIERS_THRESH and _PERIOD Jonathan Cameron
2015-01-26 14:40     ` Daniel Baluta
2015-01-26 19:01       ` Jonathan Cameron
2015-01-27 16:20         ` Tirdea, Irina
2015-01-11 19:10 ` [PATCH v2 08/10] iio: accel: mma9551: Add runtime pm support Irina Tirdea
2015-01-26 19:08   ` Jonathan Cameron
2015-01-27 17:18     ` Tirdea, Irina
2015-01-11 19:10 ` [PATCH v2 09/10] iio: accel: mma9551: split driver to expose mma955x api Irina Tirdea
2015-01-26 19:25   ` Jonathan Cameron
2015-01-11 19:10 ` [PATCH v2 10/10] iio: add driver for Freescale MMA9553 Irina Tirdea
2015-01-26 20:44   ` Jonathan Cameron
2015-01-27 17:09     ` Tirdea, Irina
2015-01-27 17:31       ` Jonathan Cameron

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