pci550x_load

linux下面

#!/bin/bash
module="pci550x"
device="pci550x"
mode="664"

# invoke insmod with all arguments we were passed
/sbin/insmod /lib/modules/`uname -r`/misc/$module.o $* || exit 1

# remove stale nodes
rm -f /dev/${device}[0-3]

major=`awk "\\$2==\"$module\" {print \\$1}" /proc/devices`

mknod /dev/${device}0 c $major 0
mknod /dev/${device}1 c $major 1
mknod /dev/${device}2 c $major 2
mknod /dev/${device}3 c $major 3

# give appropriate group/permissions, and change the group
# not all distributions have staff; some have "users" instead
group="staff"
grep '^staff:' /etc/group > /dev/null || group="users"

chgrp $group /dev/${device}[0-3]
chmod $mode  /dev/${device}[0-3]