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#!/bin/sh
#
# This script is executed at the start and end of each run-level
# transition. It is the first 'stop' script and the last 'start'
# script.
#
# 'stop' sets the correct colour power LED to flash between the
# two colours of the previous and next runlevel.
# 'start' sets the LED to steady
#
# The 'ready' led is used for the indication of state, except that
# if a 'status' led is used ready+status is set in place of !ready.
#
# For NSLU2:
#
# 'amber' is used for run levels S (from /linuxrc), 0 (halt),
# 1 (single user) and 6 (reboot). halt and reboot do not
# terminate therefore the LED remains flashing until the
# kernel terminates.
#
# 'green' is used for run levels 2-5 - the normal user run levels.
#
# state outputs 's' (for 'system') or 'u' (for user) to distinguish
# the required colours.
#
# NOTE: this will change
state(){
case "$1" in
S|0|1|6) echo s;;
2|3|4|5) echo u;;
N) echo s;;
*) echo "led change: $runlevel: runlevel unknown" >&2
echo s;;
esac
}
# Make the named LED do something
flash(){
echo timer >/sys/class/leds/"$1"/trigger
echo 200 >/sys/class/leds/"$1"/frequency
}
on(){
echo none >/sys/class/leds/"$1"/trigger
echo 100 >/sys/class/leds/"$1"/brightness
}
off(){
echo none >/sys/class/leds/"$1"/trigger
echo 0 >/sys/class/leds/"$1"/brightness
}
test -d /sys/class/leds/ready && case "$1" in
start) if test -d /sys/class/leds/status
then
case "$(state "$runlevel")" in
s) on status
on ready;;
u) off status
on ready;;
esac
else
on ready
fi;;
stop) if test -d /sys/class/leds/status
then
case "$(state "$previous")$(state "$runlevel")" in
ss) flash status
flash ready;;
su|us) flash status
on ready;;
uu) off status
flash ready;;
esac
else
flash ready
fi;;
*) echo "led change: $1: command ignored" >&2;;
esac
exit 0
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