magisk-ghid/system/bin/ghid.sh

#!/system/bin/sh
# $1 setup
controller=$(getprop sys.usb.controller)
moddir=[MODDIR]
selected=standard-keyboard
remove_ghid() {
        echo "disabling ghid" >>$moddir/ghid.log
        rm /config/usb_gadget/g1/configs/b.1/fhid
        rmdir /config/usb_gadget/g1/functions/hid.usb0
}

enable_ghid() {
        echo "enabling ghid" >>$moddir/ghid.log
        running=true
        . "$moddir/definitions/$selected"
        if [ ! -d /config/usb_gadget/g1/functions/hid.usb0 ]; then
                mkdir /config/usb_gadget/g1/functions/hid.usb0
        fi
        current_protocols="$(cat /config/usb_gadget/g1/functions/hid.usb0/protocol)"
        current_subclasses="$(cat /config/usb_gadget/g1/functions/hid.usb0/subclass)"
        current_report_lengths="$(cat /config/usb_gadget/g1/functions/hid.usb0/report_length)"
        echo "current ghid" >>$moddir/ghid.log
        echo current_protocols $current_protocols >>$moddir/ghid.log
        echo current_subclasses $current_subclasses >>$moddir/ghid.log
        echo current_report_lengths $current_report_lengths >>$moddir/ghid.log

        if [ -e /config/usb_gadget/g1/functions/hid.usb0 -a "$current_protocols" == "$protocols" -a "$current_subclasses" == "$subclasses" -a "$current_report_lengths" == "$report_lengths" ]  && diff "$moddir/reports/$report_names" /config/usb_gadget/g1/functions/hid.usb0/report_desc ; then
                echo nothing to update >>$moddir/ghid.log
                return 0
        fi

        echo new ghid >>$moddir/ghid.log

        echo $protocols >>$moddir/ghid.log
        echo $subclasses >>$moddir/ghid.log
        echo $report_lengths >>$moddir/ghid.log

        rm /config/usb_gadget/g1/configs/b.1/fhid
        echo $protocols >/config/usb_gadget/g1/functions/hid.usb0/protocol
        echo $subclasses >/config/usb_gadget/g1/functions/hid.usb0/subclass
        echo $report_lengths >/config/usb_gadget/g1/functions/hid.usb0/report_length
        cp "$moddir/reports/$report_names" /config/usb_gadget/g1/functions/hid.usb0/report_desc
        cd /config/usb_gadget/g1/configs/b.1/
        /data/adb/magisk/busybox ln -nsf ../../../../usb_gadget/g1/functions/hid.usb0 ./fhid
}

echo success ghid was run >>$moddir/ghid.log

if ! [[ "$1" == "setup" ]]; then
        exit 1
fi
shift

case "$1" in
        ""|"none" )
                remove_ghid
                ;;
        * )
                enable_ghid
        ;;
esac