linux-kernel - Re: [Patch v3 6/6] iio: Added ABI description for quaternion

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Message-ID: <53497066.9000200@kernel.org>
Date:	Sat, 12 Apr 2014 17:57:10 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
CC:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch v3 6/6] iio: Added ABI description for quaternion

On 09/04/14 01:56, Srinivas Pandruvada wrote:
> Added documentation for reading quaternion components for 3D rotations.
>
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Your quaternion description doesn't really include all the nuances of
quaternions, but will do the job without confusing anyone ;)
(no particularly reason that we have to get a unit quaternion for example)
> ---
>   Documentation/ABI/testing/sysfs-bus-iio | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 6e02c50..d1cad9a 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -891,3 +891,12 @@ Contact:	linux-iio@...r.kernel.org
>   Description:
>   		This attribute is used to get/set the integration time in
>   		seconds.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/in_rot_quaternion_raw
> +KernelVersion:	3.15
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Raw value of quaternion components using a format
> +		x y z w. Here x, y, and z component represents the axis about
> +		which a rotation will occur and w component represents the
> +		amount of rotation.
>

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