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iio: core: Introduce IIO_CHAN_INFO_DEBOUNCE_COUNT and _TIME 

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
View File

@ -1193,3 +1193,18 @@ Description:
This attribute is used to read the current speed value of the This attribute is used to read the current speed value of the
user (which is the norm or magnitude of the velocity vector). user (which is the norm or magnitude of the velocity vector).
Units after application of scale are m/s. 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
View File

@ -126,6 +126,8 @@ static const char * const iio_chan_info_postfix[] = {
[IIO_CHAN_INFO_ENABLE] = "en", [IIO_CHAN_INFO_ENABLE] = "en",
[IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
[IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", [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
View File

@ -41,6 +41,8 @@ enum iio_chan_info_enum {
IIO_CHAN_INFO_ENABLE, IIO_CHAN_INFO_ENABLE,
IIO_CHAN_INFO_CALIBHEIGHT, IIO_CHAN_INFO_CALIBHEIGHT,
IIO_CHAN_INFO_CALIBWEIGHT, IIO_CHAN_INFO_CALIBWEIGHT,
IIO_CHAN_INFO_DEBOUNCE_COUNT,
IIO_CHAN_INFO_DEBOUNCE_TIME,
}; };
enum iio_shared_by { enum iio_shared_by {