bluez5: ccimx8: use kernel module for bluetooth power management

Modify bluetooth init script to use kernel module to power on/off
the bluetooth chip instead of managing it directly from sysfs.

https://jira.digi.com/browse/DEL-6615

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>

meta-digi-dey/recipes-connectivity/bluez/bluez5-5.50/ccimx8x/bluetooth-init

@@ -1,7 +1,7 @@
 #!/bin/sh
 #===============================================================================
 #
-#  Copyright (C) 2018 by Digi International Inc.
+#  Copyright (C) 2018,2019 by Digi International Inc.
 #  All rights reserved.
 #
 #  This program is free software; you can redistribute it and/or modify it
@@ -13,32 +13,6 @@
 #
 #===============================================================================
 
-# Bluetooth power GPIO
-BT_EN_QCA_GPIO_NR="394"
-
-# 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
-}
-
-error() {
-	echo ${1}
-	exit 1
-}
-
 bluetooth_init() {
 	# Get MAC address from the device tree. Use a default value if it has not been set.
 	BT_MACADDR="$(hexdump -ve '1/1 "%02X" ":"' /proc/device-tree/bluetooth/mac-address 2>/dev/null | sed 's/:$//g')"
@@ -52,10 +26,11 @@ bluetooth_init() {
 	for RETRY in $(seq 1 5)
 	do
 		killproc hciattach
-		powercycle_gpio "${BT_EN_QCA_GPIO_NR}"
+		modprobe btdigi
 		if hciattach ttyBt qca ${BT_RATE:-3000000} -t30 ${BT_FLOW:-flow} unused ${BT_MACADDR} >${HCIATTACH_LOG} 2>&1; then
 			return
 		fi
+		rmmod btdigi
 		sleep 1
 	done
 	BT_ERROR="FAIL (hciattach)"
@@ -76,8 +51,7 @@ case "$1" in
 		if [ -d "/sys/class/bluetooth/hci0" ]; then
 			echo -n "Stopping bluetooth hardware: "
 			killproc hciattach
-			# Power down bluetooth
-			set_gpio_value "${BT_EN_QCA_GPIO_NR}" 0
+			rmmod btdigi
 			echo "done."
 		fi
 		;;