#!/bin/sh
#===============================================================================
#
#  Copyright (C) 2023 by Digi International Inc.
#  All rights reserved.
#
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of the GNU General Public License version 2 as published by
#  the Free Software Foundation.
#
#
#  !Description: Initialize bluetooth hardware
#
#===============================================================================

HCI_IFACE="hci0"

log() {
	printf "<3>iw612-bluetooth: %s\n" "${1}" >/dev/kmsg
}

set_btaddr() {
	bt_addr=$(echo $(fw_printenv -n btaddr) | awk -F ":" '{ for(i=NF;i>=1;i--) printf "0x%s ", $i }')
	hcitool -i ${HCI_IFACE} cmd 0x3f 0x0022 0xfe 0x06 ${bt_addr}
}

bluetooth_start() {
	if ! [ -e "/proc/device-tree/bluetooth/mac-address" ]; then
		log "[ERROR] Bluetooth mac-address not found"
		return
	fi

	# If there is a hciattach process running, just do nothing
	pidof hciattach > /dev/null && log "Bluetooth already activated" && return

	# If port speed is 3M, assume that FW has been modified to run at that speed
	if [ "$(stty -F /dev/ttyBt speed)" != "3000000" ]; then
		hciattach -t5 /dev/ttyBt any 115200 flow nosleep && \
		hciconfig ${HCI_IFACE} up && \
		sleep 0.2 && \
		set_btaddr && \
		# Change rate to 3M using a custom vendor command
		hcitool -i ${HCI_IFACE} cmd 0x3f 0x0009 0xc0 0xc6 0x2d 0x00 && \
		sleep 0.2 && \
		killall hciattach && \
		sleep 0.2
	fi

	hciattach -t5 /dev/ttyBt any -s 3000000 3000000 flow && \
	log "Bluetooth activated" && return

	log "[ERROR] Cannot initialize Bluetooth"
	return 1
}

bluetooth_stop() {
	if [ -e "/sys/class/bluetooth/${HCI_IFACE}" ]; then
		killall hciattach > /dev/null
		sleep 1
		# send a raw hci reset to set the chip in a good state
		echo -e -n \\x01\\x03\\x0c\\x00 > /dev/ttyBt
	fi
}

case "$1" in
	start)
		bluetooth_start
		;;
	stop)
		bluetooth_stop
		;;
	restart)
		$0 stop
		sleep 1
		$0 start
		;;
	*)
		echo "Usage: $0 {start|stop|restart}"
		exit 1
		;;
esac