On 27/01/15 18:41, Irina Tirdea wrote: > 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@xxxxxxxxx> Applied to the togreg branch of iio.git - initially pushed out as testing. Thanks, Jonathan > --- > 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@xxxxxxxxxxxxxxx > +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@xxxxxxxxxxxxxxx > +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 { > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
