#!/bin/sh
#===============================================================================
#
#  bluez
#
#  Copyright (C) 2012-2014 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: Configure Bluetooth
#
#===============================================================================

set -e

if [ "${1}" != "start" ]; then
	exit 0
fi

SCRIPTNAME="$(basename "${0}")"
LOGFILE="/var/log/bluetoothd.log"

bt_init_qca6564() {
	MOD_VERSION="$(($(cat /proc/device-tree/digi,hwid,hv 2>/dev/null || true)))"

	# Reset the BT_EN line
	BT_EN_QCA_GPIO_NR="137"
	BT_EN_L="/sys/class/gpio/gpio${BT_EN_QCA_GPIO_NR}"
	[ -d "${BT_EN_L}" ] || printf "%s" ${BT_EN_QCA_GPIO_NR} > /sys/class/gpio/export
	printf out > ${BT_EN_L}/direction && sleep .1
	printf 0 > ${BT_EN_L}/value && sleep .1
	printf 1 > ${BT_EN_L}/value && sleep .1
	[ -d "${BT_EN_L}" ] && printf "%s" ${BT_EN_QCA_GPIO_NR} > /sys/class/gpio/unexport

	# Module version older than revision 4 has swapped TX and RX lines
	if [ "${MOD_VERSION}" -lt "4" ]; then
		# Workaround to ignore the CTS flow control line
		BT_CTS_QCA_GPIO_NR="18"
		BT_CTS_L="/sys/class/gpio/gpio${BT_CTS_QCA_GPIO_NR}"
		[ -d "${BT_CTS_L}" ] || printf "%s" ${BT_CTS_QCA_GPIO_NR} > /sys/class/gpio/export
		printf out > ${BT_CTS_L}/direction && sleep .1
		printf 0 > ${BT_CTS_L}/value && sleep .1
		[ -d "${BT_CTS_L}" ] && printf "%s" ${BT_CTS_QCA_GPIO_NR} > /sys/class/gpio/unexport
		# Reduce the rate to avoid the need for HW flow control
		BT_RATE="115200"
		BT_FLOW="noflow"
	fi

	if hciattach -t120 ttyBt qca ${BT_RATE:-3000000} ${BT_FLOW:-flow} 2>${LOGFILE}; then
		:	# No-op
	else
		echo "${SCRIPTNAME}: FAILED (hciattach)"
		exit
	fi

	# Convert the BT address to the hcitool command format.
	#   Example:  "00:04:F3:11:22:33" coverted to "33 22 11 F3 04 00"
	HCI_BTADDR="$(echo ${BTADDR} | tr ':' '\n' | tac | tr '\n' ' ' | sed -e 's/ $//g')"

	# Up the interface to be able to send hci commands
	if ! hciconfig hci0 up; then
		echo "${SCRIPTNAME}: FAILED (hci0 up)"
		exit
	fi

	# Set the MAC address
	if ! hcitool -i hci0 cmd 3F 000B 01 02 06 ${HCI_BTADDR} > /dev/null; then
		echo "${SCRIPTNAME}: FAILED (hci set MAC)"
		exit
	fi

	# HCI Reset
	if ! hcitool -i hci0 cmd 03 0003 00 > /dev/null; then
		echo "${SCRIPTNAME}: FAILED (hci reset)"
		exit
	fi

	# Down and up the interface to load the new MAC address
	if ! hciconfig hci0 down; then
		echo "${SCRIPTNAME}: FAILED (hci0 down)"
		exit
	fi

	hciconfig hci0 up && echo "${SCRIPTNAME}: OK" || echo "${SCRIPTNAME}: FAILED"
}

bt_init_ar3k() {
	if grep -qs '\<digi,ccardimx28\>' /proc/device-tree/compatible; then
		BT_PWR_GPIO_NR="21"
	elif grep -qs '\<digi,ccimx6\>' /proc/device-tree/compatible; then
		BT_PWR_GPIO_NR="244"
	fi

	# Use a sub-shell here to change to firmware directory
	(
		cd /lib/firmware/ar3k/1020200

		# Update the MAC address file only if it has changed.
		FW_MAC="ar3kbdaddr.pst"
		[ -f "${FW_MAC}" ] && [ "$(cat ${FW_MAC})" = "${BTADDR}" ] || echo ${BTADDR} > ${FW_MAC}

		JPN_REGCODE="0x2"
		REGCODE="$(cat /proc/device-tree/digi,hwid,cert 2>/dev/null)"
		BT_CLASS_LINK="PS_ASIC.pst"
		BT_CLASS_FILE="PS_ASIC_class_1.pst"
		if [ -n "${REGCODE}" ] && [ "${JPN_REGCODE}" = "${REGCODE}" ]; then
			BT_CLASS_FILE="PS_ASIC_class_2.pst"
		fi

		# Replace the configuration file if different
		if ! cmp -s ${BT_CLASS_FILE} ${BT_CLASS_LINK}; then
			ln -sf ${BT_CLASS_FILE} ${BT_CLASS_LINK}
		fi
		# Remove not used configuration and readme files
		# -- Do not quote the subcommand to avoid leading/trailing whitespace
		# -- being part of the file name.
		rm -f $(echo PS_ASIC_class_?.pst | sed -e "s,${BT_CLASS_FILE},,g") readme.txt
	)

	# Start the Bluetooth driver and daemon (D-BUS must already be running)
	RETRIES="5"
	while [ "${RETRIES}" -gt "0" ]; do
		hciattach ttyBt ath3k 4000000 1>${LOGFILE} && break
		if [ -n "${BT_PWR_GPIO_NR}" ]; then
			#
			# If hciattach fails try to recover it by toggling the BT power GPIO
			#
			BT_PWR_L="/sys/class/gpio/gpio${BT_PWR_GPIO_NR}"
			[ -d "${BT_PWR_L}" ] || printf "%s" ${BT_PWR_GPIO_NR} > /sys/class/gpio/export
			printf out > ${BT_PWR_L}/direction && sleep .2
			printf 0 > ${BT_PWR_L}/value && sleep .2
			printf 1 > ${BT_PWR_L}/value && sleep .2
			[ -d "${BT_PWR_L}" ] && printf "%s" ${BT_PWR_GPIO_NR} > /sys/class/gpio/unexport
		else
			sleep .5
		fi
		RETRIES="$((RETRIES - 1))"
	done
	if [ "${RETRIES}" -eq "0" ]; then
		echo "${SCRIPTNAME}: FAILED (hciattach)"
		exit
	fi
	if hciconfig hci0 up; then
		:	# No-op
	else
		echo "${SCRIPTNAME}: FAILED"
		exit
	fi
}

# Check if this hardware does support Bluetooth
if [ -d "/proc/device-tree/bluetooth" ]; then
	# Get MAC address from device tree. Use a default value if it has not been set.
	if [ -f "/proc/device-tree/bluetooth/mac-address" ]; then
		BTADDR="$(hexdump -ve '1/1 "%02X" ":"' /proc/device-tree/bluetooth/mac-address | sed 's/:$//g')"
	fi
	if [ -z "${BTADDR}" ] || [ "${BTADDR}" = "00:00:00:00:00:00" ]; then
		BTADDR="00:04:F3:FF:FF:BB"
	fi

	# Initialize for the specific bluetooth chip
	if grep -qs '\<digi,ccimx6ul\>' /proc/device-tree/compatible; then
		bt_init_qca6564
	else
		bt_init_ar3k
	fi
fi

echo "Starting bluetooth services."
start-stop-daemon -S --background --exec /usr/lib/bluez5/bluetooth/bluetoothd