linux-kernel - Re: [PATCH v2 03/10] iio: core: Introduce IIO_VELOCITY and IIO_MOD_ROOT_SUM_SQUARED_X_Y

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Date:	Sun, 25 Jan 2015 23:00:58 +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, Vlad Dogaru <vlad.dogaru@...el.com>,
	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 v2 03/10] iio: core: Introduce IIO_VELOCITY and IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z

On 11/01/15 19:10, Irina Tirdea wrote:
> Some devices export the current speed value of the user.
> 
> One of this devices is Freescale's MMA9553L
> (http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf)
> that computes the speed of the user based on the number of steps and
> stride length.
> 
> Introduce a new channel type VELOCITY and a modifier for the magniture or
> norm of the velocity vector, IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z.
> 
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
Appied.
> ---
>  Documentation/ABI/testing/sysfs-bus-iio | 10 ++++++++++
>  drivers/iio/industrialio-core.c         |  2 ++
>  include/linux/iio/types.h               |  2 ++
>  3 files changed, 14 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index c627a9a..80b5efb1 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -295,6 +295,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_tilt_comp_scale
>  What:		/sys/bus/iio/devices/iio:deviceX/in_pressureY_scale
>  What:		/sys/bus/iio/devices/iio:deviceX/in_pressure_scale
>  What:		/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_scale
> +What:		/sys/bus/iio/devices/iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_scale
>  KernelVersion:	2.6.35
>  Contact:	linux-iio@...r.kernel.org
>  Description:
> @@ -1164,3 +1165,12 @@ Contact:	linux-iio@...r.kernel.org
>  Description:
>  		This attribute is used to read the number of steps taken by the user
>  		since the last reboot while activated.
> +
> +What:		/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_input
> +What:		/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_raw
> +KernelVersion:	3.19
> +Contact:	linux-iio@...r.kernel.org
> +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.
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 655755b..18a8ab9 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -74,6 +74,7 @@ static const char * const iio_chan_type_name_spec[] = {
>  	[IIO_STEPS] = "steps",
>  	[IIO_ENERGY] = "energy",
>  	[IIO_DISTANCE] = "distance",
> +	[IIO_VELOCITY] = "velocity",
>  };
>  
>  static const char * const iio_modifier_names[] = {
> @@ -99,6 +100,7 @@ static const char * const iio_modifier_names[] = {
>  	[IIO_MOD_JOGGING] = "jogging",
>  	[IIO_MOD_WALKING] = "walking",
>  	[IIO_MOD_STILL] = "still",
> +	[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
>  };
>  
>  /* relies on pairs of these shared then separate */
> diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
> index a7de445..c3601c2 100644
> --- a/include/linux/iio/types.h
> +++ b/include/linux/iio/types.h
> @@ -34,6 +34,7 @@ enum iio_chan_type {
>  	IIO_STEPS,
>  	IIO_ENERGY,
>  	IIO_DISTANCE,
> +	IIO_VELOCITY,
>  };
>  
>  enum iio_modifier {
> @@ -68,6 +69,7 @@ enum iio_modifier {
>  	IIO_MOD_JOGGING,
>  	IIO_MOD_WALKING,
>  	IIO_MOD_STILL,
> +	IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
>  };
>  
>  enum iio_event_type {
> 

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