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#!/bin/sh
# leds
#
# utilities to manipulate the settings of the system leds
#
# load the utility functions unless this script is being called
# just to load its own functions.
case "$1" in
leds) ;;
*) . /etc/default/rcS
. /etc/default/functions;;
esac
#
# led_set led-dir off|on|slow|fast|panic|blink|flash|*
# set the given LED (expressed as a directory) to the
# given status.
#
led_set(){
local setting
# expect led-dir state
if test -d "$1"
then
setting="$2"
case "$setting" in
off|on) echo -n none
case "$setting" in
on) echo -n 255;;
off) echo -n 0;;
esac >"$1/brightness";;
slow|fast|panic|blink|flash)
echo -n timer
case "$setting" in
flash) echo -n 60;;
blink) echo -n 540;;
slow) echo -n 500;;
fast) echo -n 1500;;
panic) echo -n 3000;;
esac >"$1/delay_on"
case "$setting" in
flash) echo -n 540;;
blink) echo -n 60;;
slow) echo -n 500;;
fast) echo -n 1500;;
panic) echo -n 3000;;
esac >"$1/delay_off";;
*) echo -n "$setting";;
esac >"$1/trigger"
else
echo "leds: $1: no such directory" >&2
return 1
fi
}
#
# sysled [boot] system|user|singleuser|shutdown [error|panic|*]
# set the system LEDs to indicate the given boot state, the function
# will temporarily mount sysfs is necessary (using /mnt)
#
# the cases for two LEDs (ready+status)
sysled_readystatus(){
local ready status
# expect dir [boot](system|user) [error|panic]
case "$3" in
error) ready=fast; status=off;;
panic) ready=fast; status=fast;;
*) case "$2" in
bootsystem) ready=slow; status=slow;;
system) ready=on; status=on;;
bootuser) ready=on; status=slow;;
user) ready=user; status=off;;
bootsingleuser) ready=on; status=slow;;
singleuser) ready=user; status=user;;
bootshutdown) ready=on; status=slow;;
shutdown) ready=slow; status=on;;
esac;;
esac
led_set "$1/ready" "$ready"
led_set "$1/status" "$status"
}
#
# the cases for one LED (just ready)
sysled_ready(){
local ready
# expect dir [boot](system|user) [error|panic]
case "$3" in
error) ready=fast;;
panic) ready=panic;;
*) case "$2" in
bootsystem) ready=flash;;
system) ready=blink;;
bootuser) ready=slow;;
user) ready=user;;
bootsingleuser) ready=flash;;
singleuser) ready=blink;;
bootshutdown) ready=slow;;
shutdown) ready=blink;;
esac;;
esac
led_set "$1/ready" "$ready"
}
#
# the cases for one blue flashing LED (just power)
sysled_power(){
local power
# expect dir [boot](system|user) [error|panic]
case "$3" in
error) power=off;;
panic) power=off;;
*) case "$2" in
bootsystem) power=off;; # blinking
system) power=off;; # blinking
bootuser) power=on;;
user) power=on;;
bootsingleuser) power=off;; # blinking
singleuser) power=off;; # blinking
bootshutdown) power=off;; # blinking
shutdown) power=off;; # blinking
esac;;
esac
led_set "$1/power" "$power"
}
#
sysled(){
local mp st boot isst
mp=/sys
st=1
boot=
# validate arguments
if test "$1" = boot
then
shift
boot=boot
fi
case "$1" in
system|user|singleuser|shutdown) :;;
*) echo "sysled: unknown option '$1'" >&2
echo " usage: sysled [boot] system|user|singleuser|shutdown [error|panic|*]" >&2
return 1;;
esac
if test ! -d "$mp/class/leds" && mount -t sysfs sysfs /mnt
then
mp=/mnt
fi
#
# check for the 'ready' LED - otherwise check for a 'power' LED
if test -d "$mp/class/leds/ready"
then
if test -d "$mp/class/leds/status"
then
sysled_readystatus "$mp/class/leds" $boot"$@"
else
sysled_ready "$mp/class/leds" $boot"$@"
fi
else
if test -d "$mp/class/leds/power"
then
sysled_power "$mp/class/leds" $boot"$@"
fi
fi
#
# clean up
test "$mp" = /mnt && umount /mnt
return "$st"
}
#
# beep {arguments}
# emit a beep
# does nothing if there is no beep executable, is very
# quiet in the presence of errors
beep(){
local arg
arg=
test "$1" = beep && shift
if test -x /bin/beep
then
test -c /dev/buzzer && arg="-e /dev/buzzer"
/bin/beep $arg "$@" 2>/dev/null
fi
return 0
}
#
# leds_help
# be helpful
# leds <led> off|on|slow|fast|panic|blink|flash|user|*
# leds [boot] system|user|singleuser|shutdown [error|panic|*]
leds_help(){
echo "leds: change the setting of the LEDs" >&2
echo " usage:" >&2
echo " leds [boot] system|user|singleuser|shutdown [error|panic|*]" >&2
echo " set leds during system boot to indicate a particular boot" >&2
echo " state. 'boot' means that the system is transitioning to" >&2
echo " the new state. 'error' or 'panic' means a (potentially)" >&2
echo " recoverable error or an unrecoverable error ('panic') has" >&2
echo " occured." >&2
echo " <led> off|on|slow|fast|panic|blink|flash" >&2
echo " set the named led to the given display." >&2
echo " beep {args}" >&2
echo " if possible cause the machine to emit a beep" >&2
}
#
# the real command, if required
case "$1" in
boot|system|user|singleuser|shutdown)
sysled "$@";;
beep) beep "$@";;
""|-*) leds_help;;
help) leds_help;;
leds) # just load the functions
;;
*) led_set /sys/class/leds/"$@"
esac
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