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From: Michal Bozon on 17 May 2010 19:20
here is a humble extension of leds module, adding separate
"ide-disk-read" and "ide-disk-write" triggers to existing "ide-disk"
one.

tested on pc engines ALIX.3c3 board, kernel 2.6.32, patches smoothly
current 2.6.34 as well

following scenario configures the three leds on ALIX board as
heartbeat, ide-read and ide-write indicators, respectively:

modprobe leds-alix2 force=1
modprobe ledtrig-heartbeat # not relevant to this patch
echo heartbeat > /sys/class/leds/"alix:1"/
trigger # not relevant to this patch
echo ide-disk-read > /sys/class/leds/"alix:2"/trigger
echo ide-disk-write > /sys/class/leds/"alix:3"/trigger
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