src/sys/dev/evdev/evdev_mt.c, branch releng/14.3

sys: Remove $FreeBSD$: two-line .h pattern

2023-08-16T17:54:11+00:00

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

evdev: Add parentheses around '-' expression in operand of '&'.

2021-09-15T16:03:18+00:00

This fixes a -Wparentheses error with GCC 9.

Reviewed by:	wulf
Differential Revision:	https://reviews.freebsd.org/D31947

evdev: Do not export multitouch functions which are unused outside evdev

2021-09-02T19:35:26+00:00

evdev: Add support for automatic MT protocol type A to type B conversion.

2021-08-24T22:53:56+00:00

MFC after:	2 weeks

evdev: Add implicit mode for touch tracking.

2021-08-24T22:52:37+00:00

In implicit mode assignment of slot number and tracking id is performed
automatically on each synchronization requested by device driver.

This is done with creation of intermediate buffer for multitouch events.
This buffer holds untracked events until synchronization is requested by
device driver. It is needed as touch assigment requires
knowledges of all touch positions pushed in current and previous reports.

MFC after:	2 weeks

evdev: Import support for touch-tracking.

2021-08-24T22:50:53+00:00

Touch tracking is a process of assignment of unique trackingID to each
initiated contact on the surface.  Keeping the trackingIDs persistent
across multitouch reports requires solving of so called Euclidian
Bipartite Matching problem.

This commit imports EBM-solver implementation based on Dinitz-Kronrod
algorithm to find minimum cost matching between contacts listed in two
consecutive reports.

Obtained from:	OpenBSD
MFC after:	2 weeks

evdev: Make MT tracking IDs monotonically increasing sequence.

2021-08-24T22:48:33+00:00

MFC after:	2 weeks

evdev: Give short aliases to items of evdev_mt_slot array

2021-08-24T22:47:34+00:00

with using of unioned anonymous structure.

Access to the same data by using different members of union generally
works despite it is not supported by C specs.

Also add helper function to report entire slot state.

MFC after:	2 weeks

evdev: Normalize width and pressure of single touch compat events

2021-08-24T22:46:49+00:00

to match Synaptics touchpad reporting range.

MFC after:	2 weeks

evdev: force no fuzz for autogenerated single touch compat events.

2021-08-24T22:45:50+00:00

As fuzz has already been applied on multitouch event processing.
This allows to remove existing workaround for double fuzz procesing.

MFC after:	2 weeks