linux-kernel - Re: [PATCH v3 1/3] iio: core: Introduce IIO_CHAN_INFO_DEBOUNCE_COUNT and

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Date:	Thu, 29 Jan 2015 18:39:31 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Irina Tirdea <irina.tirdea@...el.com>, linux-iio@...r.kernel.org
CC:	linux-kernel@...r.kernel.org,
	Daniel Baluta <daniel.baluta@...el.com>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>
Subject: Re: [PATCH v3 1/3] iio: core: Introduce IIO_CHAN_INFO_DEBOUNCE_COUNT
 and _TIME

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@...el.com>
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@...r.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@...r.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 {
> 

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