Linux LED Triggers

dansnyderECE2010 · 10-30-2015, 08:44 AM

I want to be able to register two triggers to one LED in the Linux LED subsystem. In specific, this is to blink an led any time a message is transmitted on either of two interfaces. We can call them CAN0 and CAN1. I'm fine with generating a new trigger that happens to reference both interfaces. I can work those details out. But I'm having issues figuring out where exactly the trigger list comes from. What I'm talking about it the contents of /sys/class/leds/Blue/trigger as an example. To set one of these triggers you simply "echo can0-tx > trigger". Any idea where triggers are defined/registered?

jamison20000e · 10-31-2015, 04:56 AM

Hi.

Here's a script I through together some time back for my text based computer(IBM-T20) (and fun:)

Code:

#!/bin/sh -e

tty | grep "/dev/tty[0-9]" > /dev/null
if [ $? -eq 0 ]; then
setleds +scroll
sleep .1
setleds +caps
sleep .1
setleds +num
sleep .1
setleds -num
sleep .2
setleds -caps
sleep .2
setleds -scroll
sleep .2
setleds +num
sleep .3
setleds +caps
sleep .3
setleds +scroll
sleep .3
setleds -num
sleep .4
setleds -caps
sleep .4
setleds -scroll
sleep .4
setleds +caps
sleep .5
setleds +num +scroll
sleep .5
setleds -num
sleep .6
setleds -caps -scroll
sleep .6
setleds -scroll -caps -num
sleep .6
setleds +scroll +caps +num
sleep .5
setleds -scroll -caps -num
sleep .4
setleds +scroll +caps +num
sleep .3
setleds -scroll -caps -num
sleep .2
setleds +scroll +caps +num
sleep .1
setleds -scroll -caps -num
sleep .1
setleds +scroll +caps +num
sleep .1
setleds -scroll -caps -num
sleep .1
setleds +scroll +caps +num
sleep .1
setleds -scroll -caps -num
fi

don't remember where I cut and pasted parts from tho, hope it helps?