system76-virtual-hub

#!/bin/sh

# system76-driver: Universal driver for System76 computers
# Copyright (C) 2005-2019 System76, Inc.
#
# This file is part of `system76-driver`.
#
# `system76-driver` is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# `system76-driver` is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with `system76-driver`; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# This script removes some USB virtual devices on suspend and rescans
# them on resume in order to prevent the system from spontaneously
# waking from suspend after a few seconds.

set -e

vendor_id="046b"
device_id="ffb0"
bus_number=""
remove_file=""

case "$(cat /sys/class/dmi/id/product_version)" in
    thelio-mega-r3)
        case "$2" in
            suspend | hybrid-sleep)
                case "$1" in
                    pre)
                        if [ -f /tmp/system76-virtual-hub ]; then
                            rm /tmp/system76-virtual-hub
                        fi

                        device_info=$(lsusb | grep "$vendor_id" | grep "$device_id")
                        bus_number=$(echo "$device_info" | awk '{print $2}' | sed 's/^0*//')

                        # Exit if bus_number is empty
                        if [ -z "$bus_number" ]; then
                            exit
                        fi

                        # Iterate through idVendor paths and directories
                        for path in /sys/bus/usb/devices/usb${bus_number}/${bus_number}-*/idVendor; do
                            dir=$(dirname "$path")
                            id_vendor=$(cat "$path")
                            if [ "$id_vendor" = "$vendor_id" ]; then
                                remove_file="${dir}/remove"
                                break
                            fi
                        done

                        # Check if a matching directory was found
                        if [ ! -z "$remove_file" ]; then
                            echo "$bus_number" > /tmp/system76-virtual-hub
                            if [ -e "$remove_file" ]; then
                                echo 1 > "$remove_file"
                            fi
                        fi
                        ;;
                    post)
                        if [ -f /tmp/system76-virtual-hub ]; then
                            bus_number=$(cat /tmp/system76-virtual-hub)
                            rm /tmp/system76-virtual-hub
                        fi
                        cd $(readlink -f /sys/bus/usb/devices/usb${bus_number})
                        echo 1 > ../rescan
                        ;;
                esac
                ;;
        esac
        ;;
esac