• Gregor Boirie's avatar
    iio:core: mounting matrix support · dfc57732
    Gregor Boirie authored
    Expose a rotation matrix to indicate userspace the chip placement with
    respect to the overall hardware system. This is needed to adjust
    coordinates sampled from a sensor chip when its position deviates from the
    main hardware system.
    
    Final coordinates computation is delegated to userspace since:
    * computation may involve floating point arithmetics ;
    * it allows an application to combine adjustments with arbitrary
      transformations.
    
    This 3 dimentional space rotation matrix is expressed as 3x3 array of
    strings to support floating point numbers. It may be retrieved from a
    "[<dir>_][<type>_]mount_matrix" sysfs attribute file. It is declared into a
    device / driver specific DTS property or platform data.
    Signed-off-by: default avatarGregor Boirie <gregor.boirie@parrot.com>
    Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
    dfc57732
sysfs-bus-iio 72.9 KB