#!/bin/bash # Purpose: Remove Realtek out-of-kernel USB WiFi adapter drivers. # # Supports dkms and non-dkms removals. # Copyright(c) 2023 Nick Morrow # # This program is free software; you can redistribute it and/or modify # it under the terms of version 2 of the GNU General Public License as # published by the Free Software Foundation. # # This program 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. SCRIPT_NAME="remove-driver.sh" SCRIPT_VERSION="20230109" MODULE_NAME="8821cu" DRV_VERSION="5.12.0.4" KVER="$(uname -r)" KARCH="$(uname -m)" #KSRC="/lib/modules/${KVER}/build" MODDESTDIR="/lib/modules/${KVER}/kernel/drivers/net/wireless/" DRV_NAME="rtl${MODULE_NAME}" DRV_DIR="$(pwd)" OPTIONS_FILE="${MODULE_NAME}.conf" # check to ensure sudo was used if [[ $EUID -ne 0 ]] then echo "You must run this script with superuser (root) privileges." echo "Try: \"sudo ./${SCRIPT_NAME}\"" exit 1 fi # support for the NoPrompt option allows non-interactive use of this script NO_PROMPT=0 # get the script options while [ $# -gt 0 ] do case $1 in NoPrompt) NO_PROMPT=1 ;; *h|*help|*) echo "Syntax $0 " echo " NoPrompt - noninteractive mode" echo " -h|--help - Show help" exit 1 ;; esac shift done # displays script name and version echo ": ${SCRIPT_NAME} v${SCRIPT_VERSION}" # check for and remove non-dkms installations # standard naming if [[ -f "${MODDESTDIR}${MODULE_NAME}.ko" ]] then echo "Removing a non-dkms installation: ${MODDESTDIR}${MODULE_NAME}.ko" rm -f ${MODDESTDIR}${MODULE_NAME}.ko /sbin/depmod -a ${KVER} fi # check for and remove non-dkms installations # with rtl added to module name (PClinuxOS) if [[ -f "${MODDESTDIR}rtl${MODULE_NAME}.ko" ]] then echo "Removing a non-dkms installation: ${MODDESTDIR}rtl${MODULE_NAME}.ko" rm -f ${MODDESTDIR}rtl${MODULE_NAME}.ko /sbin/depmod -a ${KVER} fi # check for and remove non-dkms installations # with compressed module in a unique non-standard location (Armbian) # Example: /usr/lib/modules/5.15.80-rockchip64/kernel/drivers/net/wireless/rtl8821cu/8821cu.ko.xz # Dear Armbiam, this is a really bad idea. if [[ -f "/usr/lib/modules/${KVER}/kernel/drivers/net/wireless/${DRV_NAME}/${MODULE_NAME}.ko.xz" ]] then echo "Removing a non-dkms installation: /usr/lib/modules/${KVER}/kernel/drivers/net/wireless/${DRV_NAME}/${MODULE_NAME}.ko.xz" rm -f /usr/lib/modules/${KVER}/kernel/drivers/net/wireless/${DRV_NAME}/${MODULE_NAME}.ko.xz /sbin/depmod -a ${KVER} fi # information that helps with bug reports # display kernel version echo ": ${KVER}" # display architecture echo ": ${KARCH}" # determine if dkms is installed and run the appropriate routines if command -v dkms >/dev/null 2>&1 then echo "Removing a dkms installation." # 2>/dev/null suppresses the output of dkms dkms remove -m ${DRV_NAME} -v ${DRV_VERSION} --all 2>/dev/null RESULT=$? #echo "Result=${RESULT}" # RESULT will be 3 if there are no instances of module to remove # however we still need to remove various files or the install script # may complain. if [[ ("$RESULT" = "0")||("$RESULT" = "3") ]] then if [[ ("$RESULT" = "0") ]] then echo "${DRV_NAME}/${DRV_VERSION} has been removed" fi else echo "An error occurred. dkms remove error: ${RESULT}" echo "Please report this error." exit $RESULT fi fi echo "Removing ${OPTIONS_FILE} from /etc/modprobe.d" rm -f /etc/modprobe.d/${OPTIONS_FILE} echo "Removing source files from /usr/src/${DRV_NAME}-${DRV_VERSION}" rm -rf /usr/src/${DRV_NAME}-${DRV_VERSION} make clean >/dev/null 2>&1 echo "The driver was removed successfully." echo "You may now delete the driver directory if desired." # if NoPrompt is not used, ask user some questions if [ $NO_PROMPT -ne 1 ] then read -p "Do you want to reboot now? (recommended) [y/N] " -n 1 -r echo if [[ $REPLY =~ ^[Yy]$ ]] then reboot fi fi exit 0