blob: a71d366aba6d4f7ab34821f2a0386e223c7de2cd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
#!/bin/sh
# locate the gpio controller for the KEY0 push button 'gpio@0x100005000'
GPIO_DIRNAME="unknown"
for NEXT in $(find /sys/class/gpio -name "gpiochip*" | sort)
do
cat "${NEXT}/label" | grep "gpio@0x100005000" > /dev/null && {
GPIO_DIRNAME="${NEXT}"
break
}
done
[ "unknown" == "${GPIO_DIRNAME}" ] && {
echo "unable to locate gpio controller"
exit 1
} || {
# the KEY0 gpio is the first gpio in this controller
GPIO_NUMBER="$(cat "${GPIO_DIRNAME}/base")"
echo "${GPIO_NUMBER}" > /sys/class/gpio/export
GPIO_VALUE="$(cat /sys/class/gpio/gpio${GPIO_NUMBER}/value)"
echo "KEY0 push button is at state '${GPIO_VALUE}'"
echo "${GPIO_NUMBER}" > /sys/class/gpio/unexport
}
|
