systemd/etc/udev/gentoo/udev.rules

# /etc/udev/rules/50-udev.rules:  device naming rules for udev
#
# Gentoo specific rules
#
# There are a number of modifiers that are allowed to be used in some of the
# fields.  See the udev man page for a full description of them.
#
# Try not to modify this file, if you wish to change things, create a new rule
# file that can be run before this one.
#


# console
KERNEL=="pty[pqrstuvwxyzabcdef][0123456789abcdef]", NAME="%k", GROUP="tty",	OPTIONS="last_rule"
KERNEL=="tty[pqrstuvwxyzabcdef][0123456789abcdef]", NAME="%k", GROUP="tty",	OPTIONS="last_rule"
KERNEL=="vcs*",                 NAME="%k", GROUP="tty",			OPTIONS="last_rule"
KERNEL=="vcsa*",                NAME="%k", GROUP="tty",			OPTIONS="last_rule"
KERNEL=="tty",                  NAME="%k", GROUP="tty", MODE="0666",	OPTIONS="last_rule"
KERNEL=="tty[0-9]",             NAME="%k", GROUP="tty",			OPTIONS="last_rule"
KERNEL=="tty[0-9][0-9]",        NAME="%k", GROUP="tty",			OPTIONS="last_rule"
KERNEL=="console",		NAME="%k", GROUP="tty", MODE="0600"
KERNEL=="ptmx",			NAME="%k", GROUP="tty", MODE="0666"

# tty devices
KERNEL=="ttyS[0-9]*",	NAME="%k", SYMLINK="tts/%n", GROUP="tty"
KERNEL=="ttyUSB[0-9]*",	NAME="%k", SYMLINK="tts/USB%n", GROUP="tty", MODE="0660"
KERNEL=="ippp0",	NAME="%k", GROUP="tty"
KERNEL=="isdn*"		NAME="%k", GROUP="tty"
KERNEL=="dcbri*",	NAME="%k", GROUP="tty"
KERNEL=="ircomm*",	NAME="%k", GROUP="tty"

# all block devices
SUBSYSTEM=="block", GROUP="disk"

# cdrom symlinks and other good cdrom naming
BUS=="ide",	KERNEL=="hd[a-z]", ACTION=="add", IMPORT="cdrom_id --export $tempnode"
BUS=="scsi",	KERNEL=="sr[0-9]*", ACTION=="add", IMPORT="cdrom_id --export $tempnode"
BUS=="scsi",	KERNEL=="scd[a-z]", ACTION=="add", IMPORT="cdrom_id --export $tempnode"
BUS=="scsi",	KERNEL=="sg[0-9]*", ACTION=="add", DRIVERS=="sr", GROUP="cdrom"
ENV{ID_CDROM}=="?*",		PROGRAM="seq_node.sh %r %k cdrom", SYMLINK+="%c", GROUP="cdrom"
ENV{ID_CDROM_CD_RW}=="?*",	PROGRAM="seq_node.sh %r %k cdrw",  SYMLINK+="%c"
ENV{ID_CDROM_DVD}=="?*",	PROGRAM="seq_node.sh %r %k dvd",   SYMLINK+="%c"
ENV{ID_CDROM_DVD_R}=="?*",	PROGRAM="seq_node.sh %r %k dvdrw", SYMLINK+="%c"

# disk devices
KERNEL=="sd*",		NAME="%k", GROUP="disk"
KERNEL=="dasd*",	NAME="%k", GROUP="disk"
KERNEL=="ataraid*",	NAME="%k", GROUP="disk"

# compaq smart array
KERNEL=="cciss*",	NAME="%k"
KERNEL=="ida*",		NAME="%k"

# mylex
KERNEL=="rd*",		NAME="%k"

# dri devices
KERNEL=="card*",	NAME="dri/card%n", GROUP="video"
KERNEL=="nvidia*",	NAME="%k", GROUP="video"
KERNEL=="3dfx*",	NAME="%k", GROUP="video"

# alsa devices
SUBSYSTEM=="sound", GROUP="audio"
KERNEL=="controlC[0-9]*",	NAME="snd/%k"
KERNEL=="hw[CD0-9]*",		NAME="snd/%k"
KERNEL=="pcm[CD0-9cp]*",	NAME="snd/%k"
KERNEL=="midiC[D0-9]*",		NAME="snd/%k"
KERNEL=="timer",		NAME="snd/%k"
KERNEL=="seq",			NAME="snd/%k"

# capi devices
KERNEL=="capi",		NAME="capi20", SYMLINK+="isdn/capi20", GROUP="dialout"
KERNEL=="capi*",	NAME="capi/%n", GROUP="dialout"

# cpu devices
KERNEL=="cpu[0-9]*",	NAME="cpu/%n/cpuid"
KERNEL=="msr[0-9]*",	NAME="cpu/%n/msr"
KERNEL=="microcode",	NAME="cpu/microcode"

# dm devices (ignore them)
KERNEL=="dm-[0-9]*",	OPTIONS="ignore_device"
# create a symlink named after the device map name
# note devmap_name comes with extras/multipath
#KERNEL=="dm-[0-9]*",	PROGRAM="/sbin/devmap_name %M %m", NAME="%k", SYMLINK+="%c"
KERNEL=="device-mapper",	NAME="mapper/control"

# fb devices
KERNEL=="fb[0-9]*",	NAME="fb/%n", SYMLINK+="%k", GROUP="video"

# floppy devices
KERNEL=="fd[0-9]*",	NAME="floppy/%n", SYMLINK+="%k", GROUP="floppy"

# i2c devices
KERNEL=="i2c-[0-9]*",	NAME="i2c/%n", SYMLINK+="%k"

# input devices
KERNEL=="mice",		NAME="input/%k", MODE="0644"
KERNEL=="mouse*",	NAME="input/%k", MODE="0644"
KERNEL=="event*",	NAME="input/%k", MODE="0600"
KERNEL=="js*",		NAME="input/%k", MODE="664"
KERNEL=="ts*",		NAME="input/%k", MODE="0600"

# loop devices
KERNEL=="loop[0-9]*",	NAME="loop/%n", SYMLINK+="%k", GROUP="disk"

# md block devices
KERNEL=="md[0-9]*",	NAME="md/%n", SYMLINK+="%k", GROUP="disk"

# aoe char devices,
SUBSYSTEM=="aoe", KERNEL=="discover",	NAME="etherd/%k", GROUP="disk", MODE="0220"
SUBSYSTEM=="aoe", KERNEL=="err",	NAME="etherd/%k", GROUP="disk", MODE="0440"
SUBSYSTEM=="aoe", KERNEL=="interfaces",	NAME="etherd/%k", GROUP="disk", MODE="0220"

# misc devices
KERNEL=="agpgart",	NAME="misc/%k", SYMLINK+="%k"
KERNEL=="psaux",	NAME="misc/%k", SYMLINK+="%k"
KERNEL=="rtc",		NAME="misc/%k", SYMLINK+="%k", MODE="0664"
KERNEL=="uinput",	NAME="misc/%k", SYMLINK+="%k"
KERNEL=="inotify",	NAME="misc/%k", SYMLINK+="%k", MODE="0666"

# netlink devices
KERNEL=="route",	NAME="netlink/%k"
KERNEL=="skip",		NAME="netlink/%k"
KERNEL=="usersock",	NAME="netlink/%k"
KERNEL=="fwmonitor",	NAME="netlink/%k"
KERNEL=="tcpdiag",	NAME="netlink/%k"
KERNEL=="nflog",	NAME="netlink/%k"
KERNEL=="xfrm",		NAME="netlink/%k"
KERNEL=="arpd",		NAME="netlink/%k"
KERNEL=="route6",	NAME="netlink/%k"
KERNEL=="ip6_fw",	NAME="netlink/%k"
KERNEL=="dnrtmsg",	NAME="netlink/%k"
KERNEL=="tap*",		NAME="netlink/%k"

# network devices
KERNEL=="tun",		NAME="net/%k",	MODE="0600"

# ramdisk devices
KERNEL=="ram[0-9]*",	NAME="rd/%n", SYMLINK+="%k"

# IEEE1394 (firewire) devices (must be before raw devices below)
KERNEL=="raw1394",	NAME="%k",		GROUP="video"
KERNEL=="dv1394*",	NAME="dv1394/%n",	GROUP="video"
KERNEL=="video1394*",	NAME="video1394/%n",	GROUP="video"

# raw devices
KERNEL=="raw[0-9]*",	NAME="raw/%k", GROUP="disk"
KERNEL=="ram*",		NAME="%k", GROUP="disk"

# sound devices
KERNEL=="adsp",			NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="adsp[0-9]*",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="audio",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="audio[0-9]*",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="dsp",			NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="dsp[0-9]*",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="mixer",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="mixer[0-9]*",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="sequencer",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="sequencer[0-9]*",	NAME="sound/%k", SYMLINK+="%k", GROUP="audio"

# memory devices
KERNEL=="random",	NAME="%k", MODE="0666"
KERNEL=="urandom",	NAME="%k", MODE="0444"
KERNEL=="mem",		NAME="%k", MODE="0640"
KERNEL=="kmem",		NAME="%k", MODE="0640"
KERNEL=="port",		NAME="%k", MODE="0640"
KERNEL=="full",		NAME="%k", MODE="0666"
KERNEL=="null",		NAME="%k", MODE="0666"
KERNEL=="zero",		NAME="%k", MODE="0666"

# usb devices
KERNEL=="hiddev*",		NAME="usb/%k"
KERNEL=="auer*",		NAME="usb/%k"
KERNEL=="legousbtower*",	NAME="usb/%k", GROUP="usb"
KERNEL=="dabusb*",		NAME="usb/%k"
BUS=="usb", KERNEL=="lp[0-9]*",	NAME="usb/%k", GROUP="lp"

# v4l devices
KERNEL=="video[0-9]*",	NAME="v4l/video%n", SYMLINK+="video%n", GROUP="video"
KERNEL=="radio[0-9]*",	NAME="v4l/radio%n", SYMLINK+="radio%n", GROUP="video"
KERNEL=="vbi[0-9]*",	NAME="v4l/vbi%n", SYMLINK+="vbi%n", GROUP="video"
KERNEL=="vtx[0-9]*",	NAME="v4l/vtx%n", GROUP="video"

# dvb devices
SUBSYSTEM=="dvb", PROGRAM="/bin/sh -c 'K=%k; K=$${K#dvb}; printf dvb/adapter%%i/%%s $${K%%%%.*} $${K#*.}'", NAME="%c", GROUP="video"

# Asterisk Zaptel devices
KERNEL=="zapctl",	NAME="zap/ctl"
KERNEL=="zaptimer",	NAME="zap/timer"
KERNEL=="zapchannel",	NAME="zap/channel"
KERNEL=="zappseudo",	NAME="zap/pseudo"
KERNEL=="zap[0-9]*",	NAME="zap/%n"

# pilot/palm devices
KERNEL=="pilot",	NAME="%k", GROUP="uucp"

# jaz devices
KERNEL=="jaz*",		NAME="%k", GROUP="disk"

# zip devices
KERNEL=="pocketzip*",	NAME="%k", GROUP="disk"
KERNEL=="zip*",		NAME="%k", GROUP="disk"

# ls120 devices
KERNEL=="ls120",	NAME="%k", GROUP="disk"

# lp devices
KERNEL=="lp*",		NAME="%k", GROUP="lp"
KERNEL=="irlpt",	NAME="%k", GROUP="lp"
KERNEL=="usblp",	NAME="%k", GROUP="lp"
KERNEL=="lp*",		NAME="%k", GROUP="lp"
KERNEL=="parport*",	NAME="%k", GROUP="lp"

# tape devices
KERNEL=="ht*",		NAME="%k", GROUP="tape"
KERNEL=="nht*",		NAME="%k", GROUP="tape"
KERNEL=="pt*",		NAME="%k", GROUP="tape"
KERNEL=="npt*",		NAME="%k", GROUP="tape"
KERNEL=="st*",		NAME="%k", GROUP="tape"
KERNEL=="nst*",		NAME="%k", GROUP="tape"
KERNEL=="osst*",	NAME="%k", GROUP="tape"
KERNEL=="nosst*",	NAME="%k", GROUP="tape"

# diskonkey devices
KERNEL=="diskonkey*",	NAME="%k", GROUP="disk"

# rem_ide devices
KERNEL=="microdrive*",	NAME="%k", GROUP="disk"

# kbd devices
KERNEL=="kbd",		NAME="%k", MODE="0664"

# Sony Vaio Jogdial sonypi device
KERNEL=="sonypi",	NAME="%k", MODE="0666"

# packet devices
KERNEL=="pktcdvd",		NAME="pktcdvd/control", GROUP="cdrw", MODE="0660"
KERNEL=="pktcdvd[0-9]*",	NAME="pktcdvd/pktcdvd%n", GROUP="cdrw", MODE="0660"

# infiniband devices
KERNEL=="umad*",	NAME="infiniband/%k"
KERNEL=="issm*",	NAME="infiniband/%k"


# usbfs-like device nodes
SUBSYSTEM=="usb_device", PROGRAM="/bin/sh -c 'K=%k; K=$${K#usbdev}; printf bus/usb/%%03i/%%03i $${K%%%%.*} $${K#*.}'", NAME="%c", MODE="0644"


# Module autoloading

# Autoload modules that lack aliases but have them defined inutoload modules
SYSFS{modalias}=="?*", ACTION=="add", RUN+="/sbin/modprobe $env{MODALIAS}"

# /etc/modprobe.conf.
SUBSYSTEM=="pnp", ENV{MODALIAS}!="?*", RUN+="/bin/sh -c 'while read id; do /sbin/modprobe pnp:d$$id; done < /sys$devpath/id'"
# If you have problems with some pnp modules being loaded, please enter the
# following aliases into the modprobe configuration files.  These are needed by
# udev to autoload some modules
# alias pnp:dPNP0510 irtty-sir
# alias pnp:dPNP0511 irtty-sir
# alias pnp:dPNP0700 floppy
# alias pnp:dPNP0800 pcspkr
# alias pnp:dPNP0b00 rtc
# alias pnp:dPNP0303 atkbd
# alias pnp:dPNP0f13 psmouse
# alias pnp:dPNPb02f analog



# Load firmware
SUBSYSTEM=="firmware", ACTION=="add", RUN+="firmware.sh"


# be backward compatible for a while with the /etc/dev.d and /etc/hotplug.d/ systems
# run /etc/hotplug.d/ stuff only if we came from a hotplug event, not for udevstart
ENV{UDEVD_EVENT}=="1", RUN+="udev_run_hotplugd $env{SUBSYSTEM}"

# always run /etc/dev.d/ stuff for now.
RUN+="udev_run_devd $env{SUBSYSTEM}"

# debugging monitor
RUN+="socket:/org/kernel/udev/monitor"