Systemd/etc/udev/udev.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.
#
# See the udev.rules.examples file for more examples of how to create rules
#

# if this is a ide cdrom, name it the default name, and create a symlink to cdrom
BUS="ide", KERNEL="*[!0-9]", PROGRAM="/bin/cat /proc/ide/%k/media", RESULT="cdrom", NAME="%k", SYMLINK="cdrom"

# 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"

# DRI devices always go into a subdirectory (as per the LSB spec)
KERNEL="card*", NAME="dri/card%n"

# alsa devices
KERNEL="controlC[0-9]*", NAME="snd/%k"
KERNEL="hw[CD0-9]*",     NAME="snd/%k"
KERNEL="pcm[CD0-9cp]*",  NAME="snd/%k"
KERNEL="midi[CD0-9]*",   NAME="snd/%k"
KERNEL="timer",          NAME="snd/%k"
KERNEL="seq",            NAME="snd/%k"

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