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iio: core: Introduce IIO_CHAN_INFO_DEBOUNCE_COUNT and _TIME

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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_DEBOUNCE_COUNT
and IIO_CHAN_INFO_DEBOUNCE_TIME. For the pedometer, in_steps_debounce_count
will specify the number of steps that need to occur in
in_steps_debounce_time seconds so that the pedometer decides the user is
moving.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Irina Tirdea 2015-01-27 20:41:52 +02:00 committed by Jonathan Cameron
parent a9afcaa69f
commit 2f0ecb7c65
3 changed files with 19 additions and 0 deletions
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15
Documentation/ABI/testing/sysfs-bus-iio
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@ -1193,3 +1193,18 @@ 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_debounce_count
KernelVersion: 3.20
Contact: linux-iio@vger.kernel.org
Description:
Specifies the number of steps that must occur within
in_steps_filter_debounce_time for the pedometer to decide the
consumer is making steps.
What: /sys/.../iio:deviceX/in_steps_debounce_time
KernelVersion: 3.20
Contact: linux-iio@vger.kernel.org
Description:
Specifies number of seconds in which we compute the steps
that occur in order to decide if the consumer is making steps.

2
drivers/iio/industrialio-core.c
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@ -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_DEBOUNCE_COUNT] = "debounce_count",
[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
};
/**

2
include/linux/iio/iio.h
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@ -41,6 +41,8 @@ enum iio_chan_info_enum {
IIO_CHAN_INFO_ENABLE,
IIO_CHAN_INFO_CALIBHEIGHT,
IIO_CHAN_INFO_CALIBWEIGHT,
IIO_CHAN_INFO_DEBOUNCE_COUNT,
IIO_CHAN_INFO_DEBOUNCE_TIME,
};
enum iio_shared_by {