magisk-ghid/bin/ghid.sh

#!/system/bin/sh
# $1 setup
controller=$(getprop sys.usb.controller)
moddir=${0%bin/*}
selected=standard-keyboard
remove_ghid() {
	rm /config/usb_gadget/g1/configs/b.1/fhid
	rmdir /config/usb_gadget/g1/functions/hid.usb0
	echo "$controller" >/config/usb_gadget/g1/UDC
}

enable_ghid() {
	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)"

	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
		return 0
	fi


	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 $report_names /config/usb_gadget/g1/functions/hid.usb0/report_desc
	ln -s /config/usb_gadget/g1/functions/hid.usb0 /config/usb_gadget/g1/configs/b.1/fhid
	echo "$controller" >/config/usb_gadget/g1/UDC
}


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

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