iio:core: mounting matrix support

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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: Gregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

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Gregor Boirie 2016-04-20 19:23:43 +02:00 • committed by Jonathan Cameron

parent dc2c57153e

commit dfc57732ad

3 changed files with 164 additions and 0 deletions

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51

Documentation/ABI/testing/sysfs-bus-iio

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82

drivers/iio/industrialio-core.c

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31

include/linux/iio/iio.h

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