Enable EM120 WWAN modem on Thinkpad T14s

wwan_em120.sh

#!/bin/bash
set -euo pipefail

# Our WWAN hardware
wwan_device=/dev/wwan0mbim0

get_modem_index() {
    mmcli -L | awk -F'/' '{print $NF+0}'
}

# Check if ModemManager package is installed
if ! pacman -Qq modemmanager &> /dev/null; then
    printf "Error: ModemManager package is not installed. Exiting.\n"
    exit 1
fi

# Ensure ModemManager.service is enabled and start it if necessary
if ! systemctl is-enabled --quiet ModemManager.service; then
    printf "ModemManager.service is not enabled. Enabling and starting it...\n"
    if ! sudo systemctl enable --now ModemManager.service; then
        printf "Error: Failed to enable and start ModemManager.service. Exiting.\n"
        exit 1
    fi
elif ! systemctl is-active --quiet ModemManager.service; then
    printf "ModemManager.service is not running. Starting it...\n"
    if ! sudo systemctl start ModemManager.service; then
        printf "Error: Failed to start ModemManager.service. Exiting.\n"
        exit 1
    fi
fi

# Wait for ModemManager to be fully active
while ! systemctl is-active --quiet ModemManager.service; do
    printf "Waiting for ModemManager.service to become active...\n"
    sleep 1
done

printf "ModemManager.service is active. Proceeding...\n"

# Remove FCC lock which requires elevation
printf "Removing FCC lock...\n"
if ! sudo mbimcli --device-open-proxy --device="${wwan_device}" --quectel-set-radio-state=on -v; then
    printf "Error: Failed to remove FCC lock. Exiting.\n"
    exit 10
fi
printf ".. done!\n"

# Enable Quectel modem
printf "Enabling Quectel EM120R_GL..."
if ! mmcli --modem "$(get_modem_index)" --enable; then
    printf "Error: Failed to enable modem. Exiting.\n"
    exit 20
fi
printf ".. all done!\n"

# List modem details
printf "Listing modem details:\n"
if ! mmcli --modem "$(get_modem_index)"; then
    printf "Error: Failed to list modem details.\n"
    exit 30
fi