80203ccefd
Active PS/2 multiplexing is a method for attaching up to four PS/2 pointing devices to a computer. Enabling of multiplexed mode allows commands to be directed to individual devices using routing prefixes. Multiplexed mode reports input with each byte tagged to identify its source. This method differs from one currently supported by psm(4) where so called guest device (trackpoint) is attached to special interface located on the host device (touchpad) and latter performs guest protocol conversion to special encapsulation packet format. At present time active PS/2 multiplexing is used in some models of HP laptops e.g. EliteBook 8560w, 9470m. Enabling of absolute operation mode on such touchpads is connected with following problems: 1. Touchpad's port priority is lower than trackpoint's. That blocks information queries thus prevents touchpad detection and configuration. 2. Touchpad and trackpoint have different protocol packet sizes and sync bytes. As PS/2 usage is on decline only minimal possible set of changes to support Synaptics touchpad and generic mouses is implemented. Active multiplexing mode is enabled only at probe stage to scan through attached PS/2 devices to query and configure Synaptics touchpad. After touchpad has been configured, mux is switched back to legacy (hidden multiplexing) mode to perform normal interrupt-driven input data processing. Overflow bit values rather than tags are used to separate packets produced by different devices. Switching back to legacy mode allows to avoid psm(4) and atkbd(4) rework to support 4 instances of mouse driver. Note: While in hidden multiplexing mode KBC does some editing of the packet stream. It remembers the button bits from the last packet received from each device, and replaces the button bits of every packet with the logical OR of all devices’ most recent button bits. This sort of button crosstalk results in spurious button events which are inhibitted with various tricks. E.g. trackpoint middle button events are suppressed while trackpad surface is touched and touchpad left and right button events are suppressed if corresponding trackpoint buttons are pressed. PR: 231058 Reported by: Michael Figiel <mifigiel@gmail.com> Tested by: Michael Figiel <mifigiel@gmail.com> MFC after: 2 weeks |
||
|---|---|---|
| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README | ||
| README.md | ||
| UPDATING | ||
FreeBSD Source:
This is the top level of the FreeBSD source directory. This file
was last revised on:
FreeBSD
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.
Source Roadmap:
bin System/user commands.
cddl Various commands and libraries under the Common Development
and Distribution License.
contrib Packages contributed by 3rd parties.
crypto Cryptography stuff (see crypto/README).
etc Template files for /etc.
gnu Various commands and libraries under the GNU Public License.
Please see gnu/COPYING* for more information.
include System include files.
kerberos5 Kerberos5 (Heimdal) package.
lib System libraries.
libexec System daemons.
release Release building Makefile & associated tools.
rescue Build system for statically linked /rescue utilities.
sbin System commands.
secure Cryptographic libraries and commands.
share Shared resources.
stand Boot loader sources.
sys Kernel sources.
sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
used in release builds. NOTES contains documentation of
all possible entries.
tests Regression tests which can be run by Kyua. See tests/README
for additional information.
tools Utilities for regression testing and miscellaneous tasks.
usr.bin User commands.
usr.sbin System administration commands.
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html