driverctl

#!/bin/sh
# Copyright 2022-2023 Alkis Georgopoulos <github.com/alkisg>
# SPDX-License-Identifier: GPL-3.0-or-later

# Substituted at build time by dh_install
PKG=aic8800
MOD=aic8800
VER=1.0.5

help() {
    cat <<EOF
Usage: $0 <dh_install | make | postinst | postrm | troubleshoot>

Handle BrosTrend driver installation and support tasks.
EOF
}

cmd_dh_install() {
    local lpkg lversion lmod

    lpkg=$1
    lversion=$2
    case "$lpkg" in
    rtl*) lmod=${lpkg#rtl} ;;
    aic*) lmod=$lpkg ;;
    esac
    re test -n "$lpkg"
    re test -n "$lversion"
    re cd "$(dirname "$0")"
    re find . -type d -exec chmod 755 {} \;
    re find . -type f -not -name driverctl -exec chmod 644 {} \;
    # All of driverctl is already loaded so we can sed it
    re sed "s/$PKG/$lpkg/" -i driverctl
    re sed "s/$MOD/$lmod/" -i driverctl
    re sed "s/$VER/$lversion/" -i driverctl
    if [ "$lpkg" = "aic8800" ]; then
        re cd -
        return 0
    elif [ "$lmod" = "8852bu" ]; then
        re sed 's/^options.*/&\n#\n# Disable the Virtual CD-ROM mode\noptions usb-storage quirks=0bda:1a2b:i/' -i "$lmod.conf"
    elif [ -f "$lmod.conf" ]; then
        re sed 's/^options/# &/' -i "$lmod.conf"
    fi
    test -f hal/phydm/phydm_debug.h &&
        re sed 's/\bprintk/_RTW_DBG/' -i hal/phydm/phydm_debug.h
    re sed 's/.*-Werror$/EXTRA_CFLAGS += -Wno-error/' -i Makefile
    re sed 's|^EXTRA_CFLAGS += -Wimplicit-fallthrough=3$|#&|' -i Makefile
    re sed 's|^\(CONFIG_RTW_DEBUG =\).*|\1 n|' -i Makefile
    re sed 's|^\(CONFIG_WIFI_MONITOR =\).*|\1 y|' -i Makefile
    re sed 's|^\(CONFIG_RTW_LOG_LEVEL =\).*|\1 0|' -i Makefile
    re sed 's|uname -m[^)]*|uname -m \| sed -e s/i.86/i386/ -e s/armv.l/arm/ -e s/aarch64/arm64/|' -i Makefile
    re cd -
}

cmd_make() {
    local memavail nproc

    memavail=$(LANG=C free | awk '/Mem:/ { print $2 }')
    memavail=${memavail:-400000}
    nproc=$(($(nproc) - 1))
    test "$nproc" -ge 1 || nproc=1
    if [ "$memavail" -lt 400000 ] && [ "$nproc" -gt 1 ]; then
        # In low-RAM systems, use a single process to avoid OOM
        echo "Free RAM=$memavail Kb, limiting compilation processes from $nproc to 1"
        nproc=1
    fi
    # arch and kernelver are set by dkms, when it's used
    arch=${arch:-$(uname -m)}
    case "$arch" in
    i?86) arch=i386 ;;
    armv?l) arch=arm ;;
    aarch64) arch=arm64 ;;
    esac
    export ARCH="$arch"
    kernelver=${kernelver:-$(uname -r)}
    # Logs at e.g. /var/lib/dkms/rtl88???u/1.15.11/5.15.76-v8+/aarch64/log/make.log
    make all "ARCH=$ARCH" "-j$nproc" "KVER=$kernelver" "KSRC=/lib/modules/$kernelver/build"
}

# Cloned to postinst
cmd_postinst() {
    local link

    # Remove all links, both legacy and new ones
    for link in /etc/apt/trusted.gpg.d/brostrend.gpg \
        /etc/apt/trusted.gpg.d/trendtechcn.gpg \
        /etc/apt/sources.list.d/brostrend.list \
        /etc/apt/sources.list.d/trendtechcn.list \
        "/etc/modprobe.d/$MOD.conf"; do
        if [ -L "$link" ]; then
            rm -f "$link"
        fi
    done
    # Symlink our modprobe options/blacklist file
    link="/usr/src/$PKG-$VER/$MOD.conf"
    if [ -f "$link" ] &&
        [ -d /etc/modprobe.d ] &&
        [ ! -e "/etc/modprobe.d/$MOD.conf" ]; then
        ln -s "$link" /etc/modprobe.d/
    fi
    # Assume this package is the newest; link to that
    link=/usr/share/$PKG-dkms/brostrend.gpg
    if [ -d /etc/apt/trusted.gpg.d ] &&
        [ ! -e /etc/apt/trusted.gpg.d/brostrend.gpg ]; then
        ln -s "$link" /etc/apt/trusted.gpg.d/
    fi
    link=/usr/share/$PKG-dkms/brostrend.list
    if [ -d /etc/apt/sources.list.d ] &&
        [ ! -e /etc/apt/sources.list.d/brostrend.list ]; then
        ln -s "$link" /etc/apt/sources.list.d/
    fi
}

# Cloned to postrm
cmd_postrm() {
    local link

    # Remove all links, both legacy and new ones
    for link in /etc/apt/trusted.gpg.d/brostrend.gpg \
        /etc/apt/trusted.gpg.d/trendtechcn.gpg \
        /etc/apt/sources.list.d/brostrend.list \
        /etc/apt/sources.list.d/trendtechcn.list \
        "/etc/modprobe.d/$MOD.conf"; do
        if [ -L "$link" ]; then
            rm -f "$link"
        fi
    done
    # Symlink to the first remaining brostrend package
    for link in /usr/share/*-dkms/brostrend.gpg; do
        if [ -f "$link" ] &&
            [ -d /etc/apt/trusted.gpg.d ] &&
            [ ! -e /etc/apt/trusted.gpg.d/brostrend.gpg ]; then
            ln -s "$link" /etc/apt/trusted.gpg.d/
            break
        fi
    done
    for link in /usr/share/*-dkms/brostrend.list; do
        if [ -f "$link" ] &&
            [ -d /etc/apt/sources.list.d ] &&
            [ ! -e /etc/apt/sources.list.d/brostrend.list ]; then
            ln -s "$link" /etc/apt/sources.list.d/
            break
        fi
    done
}

die() {
    echo "$*" >&2
    exit 1
}

re() {
    "$@" || die "Aborting, command failed: $*"
}

main() {
    local cmd

    while :; do
        case "$1" in
        /usr/src/*/driverctl)
            # Allow wildcard invocation e.g. /usr/src/*/driverctl troubleshoot
            shift
            continue
            ;;
        dh_install | make | postinst | postrm | troubleshoot)
            cmd="cmd_$1"
            shift
            "$cmd" "$@"
            exit $?
            ;;
        *)
            help >&2
            exit 1
            ;;
        esac
    done
}

main "$@"