From b750101eb236130cf056c675997decbac904cc49 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:35:18 +0200 Subject: Adding upstream version 252.22. Signed-off-by: Daniel Baumann --- man/hwdb.xml | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 154 insertions(+) create mode 100644 man/hwdb.xml (limited to 'man/hwdb.xml') diff --git a/man/hwdb.xml b/man/hwdb.xml new file mode 100644 index 0000000..2c1e502 --- /dev/null +++ b/man/hwdb.xml @@ -0,0 +1,154 @@ + + + + + + + hwdb + systemd + + + + hwdb + 7 + + + + hwdb + Hardware Database + + + Description + The hardware database is a key-value store for associating modalias-like keys to + udev-property-like values. It is used primarily by udev to add the relevant properties + to matching devices, but it can also be queried directly. + + + Hardware Database Files + The hwdb files are read from the files located in the + system hwdb directory /usr/lib/udev/hwdb.d and + the local administration directory /etc/udev/hwdb.d. + All hwdb files are collectively sorted and processed in lexical order, + regardless of the directories in which they live. However, files with + identical filenames replace each other. Files in /etc/ + have the highest priority and take precedence over files with the same + name in /usr/lib/. This can be used to override a + system-supplied hwdb file with a local file if needed; + a symlink in /etc/ with the same name as a hwdb file in + /usr/lib/, pointing to /dev/null, + disables that hwdb file entirely. hwdb files must have the extension + .hwdb; other extensions are ignored. + + Each hwdb file contains data records consisting of matches and associated + key-value pairs. Every record in the hwdb starts with one or more match strings, + specifying a shell glob to compare the lookup string against. Multiple match lines + are specified in consecutive lines. Every match line is compared individually, and + they are combined by OR. Every match line must start at the first character of the + line. + + Match patterns consist of literal characters, and shell-style wildcards: + + Asterisk * matches any number of characters + + Question mark ? matches a single character + + Character list [chars] matches one of + the characters chars listed between [ and + ]. A range may be specified as with a dash as + [first-last]. The match may + be inverted with a caret [^…]. + + + The match lines are followed by one or more key-value pair lines, which are + recognized by a leading space character. The key name and value are separated by + =. An empty line signifies the end of a record. Lines beginning + with # are ignored. + + In case multiple records match a given lookup string, the key-value pairs + from all records are combined. If a key is specified multiple times, the value + from the record with the highest priority is used (each key can have only a single + value). The priority is higher when the record is in a file that sorts later + lexicographically, and in case of records in the same file, later records have + higher priority. + + The content of all hwdb files is read by + systemd-hwdb8 + and compiled to a binary database located at /etc/udev/hwdb.bin, + or alternatively /usr/lib/udev/hwdb.bin if you want ship the + compiled database in an immutable image. During runtime, only the binary database + is used. + + + + Examples + + + General syntax of hwdb files + + # /usr/lib/udev/hwdb.d/example.hwdb +# Comments can be placed before any records. This is a good spot +# to describe what that file is used for, what kind of properties +# it defines, and the ordering convention. + +# A record with three matches and one property +mouse:*:name:*Trackball*:* +mouse:*:name:*trackball*:* +mouse:*:name:*TrackBall*:* + ID_INPUT_TRACKBALL=1 + +# The rule above could be also be written in a form that +# matches Tb, tb, TB, tB: +mouse:*:name:*[tT]rack[bB]all*:* + ID_INPUT_TRACKBALL=1 + +# A record with a single match and five properties +mouse:usb:v046dp4041:name:Logitech MX Master:* + MOUSE_DPI=1000@166 + MOUSE_WHEEL_CLICK_ANGLE=15 + MOUSE_WHEEL_CLICK_ANGLE_HORIZONTAL=26 + MOUSE_WHEEL_CLICK_COUNT=24 + MOUSE_WHEEL_CLICK_COUNT_HORIZONTAL=14 + + + + + Overriding of properties + + # /usr/lib/udev/hwdb.d/60-keyboard.hwdb +evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer*:pn*:* + KEYBOARD_KEY_a1=help + KEYBOARD_KEY_a2=setup + KEYBOARD_KEY_a3=battery + +# Match vendor name "Acer" and any product name starting with "X123" +evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer:pnX123*:* + KEYBOARD_KEY_a2=wlan + +# /etc/udev/hwdb.d/70-keyboard.hwdb +# disable wlan key on all at keyboards +evdev:atkbd:* + KEYBOARD_KEY_a2=reserved + PROPERTY_WITH_SPACES=some string + + If the hwdb consists of those two files, a keyboard with the lookup string + evdev:atkbd:dmi:bvnAcer:bdXXXXX:bd08/05/2010:svnAcer:pnX123 + will match all three records, and end up with the following properties: + + KEYBOARD_KEY_a1=help +KEYBOARD_KEY_a2=reserved +KEYBOARD_KEY_a3=battery +PROPERTY_WITH_SPACES=some string + + + + + + See Also + + + systemd-hwdb8 + + + + -- cgit v1.2.3