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author | 2016-04-20 19:23:43 +0200 | |
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committer | 2016-04-23 22:13:05 +0100 | |
commit | dfc57732ad38f93ae6232a3b4e64fd077383a0f1 (patch) | |
tree | 180c004346687cc3d6204239a25bc630c30ea569 /drivers/iio/magnetometer/ak8975.c | |
parent | iio: gyro: bmg160: use regmap to retrieve struct device (diff) | |
download | wireguard-linux-dfc57732ad38f93ae6232a3b4e64fd077383a0f1.tar.xz wireguard-linux-dfc57732ad38f93ae6232a3b4e64fd077383a0f1.zip |
iio:core: mounting matrix support
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>
Diffstat (limited to 'drivers/iio/magnetometer/ak8975.c')
0 files changed, 0 insertions, 0 deletions