iio: core: Introduce IIO_CHAN_INFO_DEBOUNCE_COUNT and _TIME (2f0ecb7c) · Commits · 戴 / test

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>

Documentation/ABI/testing/sysfs-bus-iio

+15 −0

Original line number	Diff line number	Diff line
		@@ -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.

drivers/iio/industrialio-core.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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",
		};

		/**

include/linux/iio/iio.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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 {

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