find external IRQs at GPIO lines in broadcom BCM63268

brcm63268-irqfind.sh

#!/bin/sh
GPIOBASE=`cat /sys/class/gpio/gpiochip*/base | head -n1`
nums=`seq 0 51` 
 
cd /sys/class/gpio
for i in $nums; do
     GPIO=`expr $i + $GPIOBASE`
     echo
     echo "[GPIO$i] testing ext IRQ"
     echo $GPIO > export; echo out > gpio$GPIO/direction

     echo 0 > gpio$GPIO/value
     EI_STATUS_LOW=`devmem 0x10000018 32`

     echo 1 > gpio$GPIO/value
     EI_STATUS_HIGH=`devmem 0x10000018 32`

     if [ $EI_STATUS_LOW != $EI_STATUS_HIGH ]; then
		echo "     found ext IRQ"
		echo "     $EI_STATUS_LOW $EI_STATUS_HIGH"
     fi
     echo $GPIO > unexport
done