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#!/bin/sh
#===============================================================================
#
# Copyright (C) 2019 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
#
#===============================================================================
# Bluetooth power GPIO
BT_EN_QCA_GPIO_NR="137"
# set_gpio_value <gpio_nr> <value>
set_gpio_value() {
local SG_GPIONR="${1}"
local SG_GPIOVAL="${2}"
local SG_GPIOPATH="/sys/class/gpio/gpio${SG_GPIONR}"
[ -d "${SG_GPIOPATH}" ] || printf "%s" "${SG_GPIONR}" > /sys/class/gpio/export
printf out > "${SG_GPIOPATH}/direction" && sleep .2
printf "${SG_GPIOVAL}" > "${SG_GPIOPATH}/value" && sleep .2
[ -d "${SG_GPIOPATH}" ] && printf "%s" "${SG_GPIONR}" > /sys/class/gpio/unexport
}
# powercycle_gpio <gpio_nr>
powercycle_gpio() {
set_gpio_value "${1}" 0
set_gpio_value "${1}" 1
}
set_mac_address() {
# Get MAC address from the device tree. Use a default value if it has not been set.
BT_MACADDR="$(hexdump -ve '1/1 "%02X" ":"' /proc/device-tree/bluetooth/mac-address 2>/dev/null | sed 's/:$//g')"
if [ -z "${BT_MACADDR}" ] || [ "${BT_MACADDR}" = "00:00:00:00:00:00" ]; then
BT_MACADDR="00:04:F3:FF:FF:BB"
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_BT_ADDR="$(echo ${BT_MACADDR} | sed -e 's,^\(..\):\(..\):\(..\):\(..\):\(..\):\(..\)$,\6 \5 \4 \3 \2 \1,g')"
# Up the interface to be able to send hci commands
hciconfig hci0 up || echo "Cannot bring up bluetooth interface after initial attach" || exit 1
# Set the MAC address
hcitool -i hci0 cmd 3F 000B 01 02 06 ${HCI_BT_ADDR} > /dev/null || echo "Unable to set BT MAC Address" || exit 1
# Bring the interface down/up to apply the MAC change
hciconfig hci0 down || echo "Cannot bring down bluetooth interface after setting MAC" || exit 1
hciconfig hci0 up || echo "Cannot bring up bluetooth interface after setting MAC" || exit 1
}
bluetooth_init() {
# Start the Bluetooth driver and bring up the interface
killproc hciattach
powercycle_gpio "${BT_EN_QCA_GPIO_NR}"
hciattach ttymxc0 qualcomm 115200 -t3 flow unused > /dev/null 2>&1 || BT_ERROR="FAIL (hciattach)"
set_mac_address || BT_ERROR="Unable to set MAC address"
}
# Source function library
. /etc/init.d/functions
case "$1" in
start)
if [ -d "/proc/device-tree/bluetooth" ]; then
echo -n "Starting bluetooth hardware: "
bluetooth_init
echo "${BT_ERROR:-done.}"
fi
;;
stop)
if [ -d "/sys/class/bluetooth/hci0" ]; then
echo -n "Stopping bluetooth hardware: "
killproc hciattach
# Power down bluetooth
set_gpio_value "${BT_EN_QCA_GPIO_NR}" 0
echo "done."
fi
;;
restart)
$0 stop
sleep 1
$0 start
;;
*)
echo "Usage: $0 {start|stop|restart}"
exit 1
;;
esac
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