linux-kernel - Re: [RFC PATCH 6/8] iio: core: Introduce new STEP

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Date:	Sat, 04 Oct 2014 13:56:15 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Daniel Baluta <daniel.baluta@...el.com>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
CC:	irina.tirdea@...el.com
Subject: Re: [RFC PATCH 6/8] iio: core: Introduce new STEP_DETECT event

On 02/10/14 14:43, Daniel Baluta wrote:
> From: Irina Tirdea <irina.tirdea@...el.com>
> 
> This event is needed for the step detection functionality of a pedometer:
> an interrupt is generated by the hardware device each time
> a step is detected.
> 
> To support this, we add a new iio event.
> 
> For more information on the pedometer requirements for Android see
> http://source.android.com/devices/sensors/composite_sensors.html#detector.
> 
> A device that has the pedometer functionality this interface needs to
> support is Freescale's MMA9553L:
> http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf
> 
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
> Signed-off-by: Daniel Baluta <daniel.baluta@...el.com>
This could be more generic.  Perhaps an 'instance' event?
If applied to our step type it would
be in_step_instance_en etc?


> ---
>  Documentation/ABI/testing/sysfs-bus-iio | 7 +++++++
>  drivers/iio/industrialio-event.c        | 1 +
>  include/linux/iio/types.h               | 1 +
>  3 files changed, 9 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index c02785d..fd66073 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -815,6 +815,13 @@ Description:
>  		Enables or disables motion detection. Each time motion is detected an
>  		event of this type will be generated.
>  
> +What:		/sys/.../events/in_activity_step_detect_either_en
> +KernelVersion:	3.17
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Enables or disables step detection. Each time the user takes a step an
> +		event of this type will be generated.
> +
>  What:		/sys/bus/iio/devices/iio:deviceX/trigger/current_trigger
>  KernelVersion:	2.6.35
>  Contact:	linux-iio@...r.kernel.org
> diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
> index eca5af2..c2ade1f 100644
> --- a/drivers/iio/industrialio-event.c
> +++ b/drivers/iio/industrialio-event.c
> @@ -198,6 +198,7 @@ static const char * const iio_ev_type_text[] = {
>  	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
>  	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
>  	[IIO_EV_TYPE_MOTION] = "motion",
> +	[IIO_EV_TYPE_STEP_DETECT] = "step_detect",
>  };
>  
>  static const char * const iio_ev_dir_text[] = {
> diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
> index ae51780..83768a6 100644
> --- a/include/linux/iio/types.h
> +++ b/include/linux/iio/types.h
> @@ -75,6 +75,7 @@ enum iio_event_type {
>  	IIO_EV_TYPE_THRESH_ADAPTIVE,
>  	IIO_EV_TYPE_MAG_ADAPTIVE,
>  	IIO_EV_TYPE_MOTION,
> +	IIO_EV_TYPE_STEP_DETECT,
>  };
>  
>  enum iio_event_info {
> 
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