#!/bin/bash

# Simple shell script to wait for the tty for an uart using BT HCI to show up

# and then invoke btattach with the right parameters, this is intended to be

# invoked from a hardware-activated systemd service

#

# For now this only suports ACPI enumerated Broadcom BT HCIs.

# This has been tested on Bay and Cherry Trail devices with both ACPI and

# PCI enumerated UARTs.

#

# Note the kernel bt developers are working on solving this entirely in the

# kernel, so it is not worth the trouble to write something better then this.

BT_DEV="/sys/bus/platform/devices/$1"

BT_DEV="$(readlink -f $BT_DEV)"

UART_DEV="$(dirname $BT_DEV)"

# Stupid GPD-pocket has USB BT with id 0000:0000, but still claims to have

# an uart attached bt

if [ "$1" = "BCM2E7E:00" ] && lsusb | grep -q "ID 0000:0000"; then

	exit 0

fi

while [ ! -d "$UART_DEV/tty" ]; do

	sleep .2

done

TTY="$(ls $UART_DEV/tty)"

exec btattach --bredr "/dev/$TTY" -P bcm