From 2f0ecb7c6563d711bec15268d56adf1c630e77d1 Mon Sep 17 00:00:00 2001 From: Irina Tirdea Date: Tue, 27 Jan 2015 20:41:52 +0200 Subject: [PATCH] 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 Signed-off-by: Jonathan Cameron --- Documentation/ABI/testing/sysfs-bus-iio | 15 +++++++++++++++ drivers/iio/industrialio-core.c | 2 ++ include/linux/iio/iio.h | 2 ++ 3 files changed, 19 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index c03a140..b4ea9c5 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -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. diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 4ee6fdf..aaba9d3 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_DEBOUNCE_COUNT] = "debounce_count", + [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", }; /** diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index 51f1643..80d8550 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_DEBOUNCE_COUNT, + IIO_CHAN_INFO_DEBOUNCE_TIME, }; enum iio_shared_by { -- 2.7.4