#!/bin/bash
#
# Configure
#
# linux-wlan Open Sourc Project
#
# Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
# -------------------------------------------------------------------------
#
# Inquiries regarding the linux-wlan Open Source Project can be
# made directly to:
#
# AbsoluteValue Systems Inc.
# info@linux-wlan.com
# http://www.linux-wlan.com
#
# -------------------------------------------------------------------------
# TODO: Since we're dependent on configured pcmcia source, we should change 
#       this such that it will ask for the pcmcia source dir and then read
#       all our stuff from pcmcia/config.mk.  Would simplify alot of things.
# -------------------------------------------------------------------------
#
# This script adapted from the pcmcia-cs/Configure file, license statement below:
#
# pcmcia-cs/Configure 1.110 1999/06/24 17:37:36
#
# The contents of this file are subject to the Mozilla Public License
# Version 1.0 (the "License"); you may not use this file except in
# compliance with the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS"
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
# the License for the specific language governing rights and
# limitations under the License.
#
# The initial developer of the Configure code is David A. Hinds
# <dhinds@hyper.stanford.edu>.  Portions created by David A. Hinds
# are Copyright (C) 1998 David A. Hinds.  All Rights Reserved.
#-------------------------------------------------------------------------

ECHO="/bin/echo -e "
fail ()
{
	$ECHO ""
	$ECHO "Configuration failed"
	$ECHO ""
	exit 1
}

usage () {
    $ECHO "usage: Configure [-h|help|-d [filename]|-f <filename>]"
    $ECHO ""
    $ECHO "  -h|help       - display usage info"
    $ECHO "  -d [filename] - automated configuration with option to specify input file"
    $ECHO "  -f <filename> - read configuration data from file and prompt user"
    exit 1
}

if [ ! -r config.in ]; then
    $ECHO "config.in does not exist!"
    fail
fi

. ./config.in

if [ -r config.out ]; then
    . ./config.out 2>/dev/null
fi

PROMPT=y
if [ $# -gt 0 ] ; then
	if [ "$1" = "-h" -o "$1" = "help" ] ; then 
		usage
	fi
	if [ "$1" = "-d" -o "$1" = "-f" ] ; then 
		if [ $# -gt 1 ] ; then
			if [ -r $2 ]; then
				. $2
			else
				$ECHO "$2 does not exist"
				fail
			fi
		else
			if [ "$1" = "-f" ] ; then 
				usage
			fi
		fi
		if [ "$1" = "-d" ] ; then 
			PROMPT=n
		fi
	fi
fi

#=======================================================================

CONFIG=config.new
CONFIG_MK=config.mk
rm -f $CONFIG $CONFIG_MK $MODVER

cat << 'EOF' > $CONFIG
#
# Automatically generated by 'make config' -- don't edit!
#
EOF

write_bool() {
    value=`eval $ECHO '$'$1`
    if [ "$value" = "y" ] ; then
	$ECHO "$1=y" >> $CONFIG
	$ECHO "$1=y" >> $CONFIG_MK
    else
	$ECHO "$1=n" >> $CONFIG
	$ECHO "# $1 is not defined" >> $CONFIG_MK
    fi
}

write_str () {
    value=`eval $ECHO '$'$1`
    $ECHO "$1"=\"$value\" >> $CONFIG
    $ECHO "$1=$value" >> $CONFIG_MK
}


dump_str () {
    $ECHO "$1" >> $CONFIG
    $ECHO "$1" >> $CONFIG_MK
}

prompt () {
    eval $3=\"$2\"
    if [ "$PROMPT" = "y" ] ; then
	$ECHO "$1 [$2]: \c"
	read tmp
	if [ -n "$tmp" ] ; then eval $3=\"$tmp\" ; fi
    else
	$ECHO "$1 [$2]"
    fi
}

ask_bool () {
    default=`eval $ECHO '$'$2`
    if [ ! "$default" ] ; then default=n ; fi
    answer=""
    while [ "$answer" != "n" -a "$answer" != "y" ] ; do
	prompt "$1 (y/n)" "$default" answer
    done
    eval "$2=$answer"
    write_bool $2
}

ask_str () {
    default=`eval $ECHO '$'$2`
    prompt "$1" "`$ECHO $default`" answer
    eval $2=\"$answer\"
    write_str $2
}

mkversionh () {
versionh=src/include/wlan/version.h 
cp src/version.h.in $versionh

DATE=`date`

printf '#define WLAN_RELEASE\t"%d.%d.%d%s"\n' \
        ${WLAN_VERSION} \
        ${WLAN_PATCHLEVEL} \
        ${WLAN_SUBLEVEL} \
        ${WLAN_EXTRAVERSION} >> $versionh
printf '#define WLAN_RELEASE_CODE 0x%02x%02x%02x\n' \
        ${WLAN_VERSION} \
        ${WLAN_PATCHLEVEL} \
        ${WLAN_SUBLEVEL} >> $versionh
echo   "#define WLAN_BUILD_DATE \"$DATE\" " >> $versionh

printf '\n' >> $versionh
printf '#endif\n' >> $versionh

}

#=======================================================================

# If the src/include/wlan/version.h file needs a touchup, fix or create it
if [ -r src/include/wlan/version.h ]; then
	WLAN_RELEASE="${WLAN_VERSION}.${WLAN_PATCHLEVEL}.${WLAN_SUBLEVEL}${WLAN_EXTRAVERSION}"
	OLD_RELEASE=`sed --quiet -e '/#define.*WLAN_RELEASE[^_].*\"\(.*\)\"/s//\1/p' < src/include/wlan/version.h`
	if [ "${WLAN_RELEASE}" != "${OLD_RELEASE}" ]; then
		# Overwrite the file
		mkversionh
	fi
else
	# File doesn't exist, create it
	mkversionh
fi

$ECHO ""
$ECHO "-------------- Linux WLAN Configuration Script -------------"
$ECHO ""
$ECHO "The default responses are correct for most users."
$ECHO ""

#=======================================================================
# Should we build for PCMCIA Card Services?

ask_bool "Build Prism2.x PCMCIA Card Services (_cs) driver?" PRISM2_PCMCIA

#=======================================================================
# Should we build for PLX9052 based PCI adapters?

ask_bool "Build Prism2 PLX9052 based PCI (_plx) adapter driver?" PRISM2_PLX
#=======================================================================
# Should we build for Prism2 native PCI?

ask_bool "Build Prism2.5 native PCI (_pci) driver?" PRISM2_PCI

#=======================================================================
# Should we build for Prism2.5 USB?

ask_bool "Build Prism2.5 USB (_usb) driver?" PRISM2_USB

$ECHO ""

#=======================================================================
# Collect the kernel source tree and test for sanity

CUR_RELEASE=`uname -r`

if [ "$LINUX_SRC" = "" ] ; then
    LINUX_SRC=/lib/modules/$CUR_RELEASE/build
fi

ask_str "Linux source directory" LINUX_SRC

if [ ! -f $LINUX_SRC/include/linux/version.h ] ; then
	$ECHO "Linux source tree $LINUX_SRC is incomplete or missing!"
	if [ -d $LINUX_SRC/include/linux ] ; then
	$ECHO "    The kernel header files are present, but not " \
		"the full source code."
	fi
	$ECHO "    See the HOWTO for a list of FTP sites for current" \
	 "kernel sources."
	fail
fi

KERNEL_SOURCE=$LINUX_SRC make -Cscripts 2>&1 > /dev/null
. scripts/make.opts

# What kernel are we compiling for?

version () {
	expr $1 \* 65536 + $2 \* 256 + $3
}

$ECHO ""

SRC_RELEASE="$KERNEL_RELEASE"

VERSION_CODE=`grep LINUX_VERSION_CODE $LINUX_SRC/include/linux/version.h | \
    sed -e 's/[^0-9]//g'`

$ECHO "The kernel source tree is version $SRC_RELEASE."
if [ $VERSION_CODE -lt `version 2 4 0` ] ; then
	$ECHO "This package requires at least a 2.4.x series kernel."
	fail
fi

if [ $VERSION_CODE -gt `version 2 5 0` ] ; then
        KERN_25=y
        write_bool KERN_25
fi
if [ $VERSION_CODE -ge `version 2 6 5` ] ; then
    KERN_2_6_5=y
fi
write_bool KERN_2_6_5
if [ $VERSION_CODE -ge `version 2 6 17` ] ; then
    KERN_2_6_17=y
fi
write_bool KERN_2_6_17

if [ $VERSION_CODE -gt `version 2 6 24` ] ; then
    $ECHO "******* WARNING WARNING WARNING *******"
    $ECHO "Kernels newer than 2.6.24.x are not supported."
    $ECHO "******* WARNING WARNING WARNING *******"
fi

if [ "$SRC_RELEASE" != "$CUR_RELEASE" ] ; then
	$ECHO "WARNING: the current running kernel is actually version $CUR_RELEASE."
fi

if [ ! -f $LINUX_SRC/.config ] ; then
    $ECHO "WARNING: .config not present in kernel source tree.  This will"
    $ECHO "         screw up modversions detection and build optimizations."
    $ECHO "         Is this a RedHat kernel? Workarounds enabled." 
    if [ -f $LINUX_SRC/include/linux/modversions.h ] ; then
	KERNEL_MODFLAGS="-DMODULE -DMODVERSIONS -include $LINUX_SRC/include/linux/modversions.h"
    fi
    $ECHO "         For an optimized build, copy over the relevent file from"
    $ECHO "         $LINUX_SRC/configs/ to $LINUX_SRC/.config"
fi

# Check for consistent kernel build dates
CUR_D=`uname -v | sed -e 's/^#[0-9]* //;s/SMP //;s/PREEMPT //;'`
CUR_D=`$ECHO $CUR_D | sed -e 's/\(:[0-9][0-9]\) .* \([12][90]\)/\1 \2/'`
$ECHO "The current kernel build date is $CUR_D."
UTS_VERSION="unknown";
if [ -f $LINUX_SRC/include/linux/compile.h ] ; then
	UTS_VERSION=`grep UTS_VERSION $LINUX_SRC/include/linux/compile.h |
	sed -e 's/.*"\(.*\)"/\1/'`
	SRC_D=`$ECHO $UTS_VERSION | sed -e 's/^#[0-9]* //;s/SMP //;s/PREEMPT //;'`
	SRC_D=`$ECHO $SRC_D | sed -e 's/\(:[0-9][0-9]\) .* \([12][90]\)/\1 \2/'`
	if [ $SRC_RELEASE = $CUR_RELEASE -a "$SRC_D" != "$CUR_D" ] ; then
	$ECHO "WARNING: the source tree has a build date of $SRC_D."
	if [ `date -d "$SRC_D" +%s` -gt `date -d "$CUR_D" +%s` ] ; then
		$ECHO "   Did you forget to install your new kernel?!?"
	fi
	fi
fi
$ECHO ""

	# Test for netlink availability in the kernel
	if grep -sq "#define.*CONFIG_NETLINK.*1" ${LINUX_SRC}/include/linux/autoconf.h; then
		CONFIG_NETLINK=y
	else
		CONFIG_NETLINK=n
	fi
	write_bool CONFIG_NETLINK


	# Test for pf_packet availability in the kernel
	if grep -sq "#define.*CONFIG_PACKET.*1" ${LINUX_SRC}/include/linux/autoconf.h; then
		CONFIG_PACKET=y
	else
		CONFIG_PACKET=n
	fi
	write_bool CONFIG_PACKET


	# Test for pf_packet availability in the kernel
	if grep -sq "#define.*CONFIG_HOTPLUG.*1" ${LINUX_SRC}/include/linux/autoconf.h; then
		CONFIG_HOTPLUG=y
	else
		CONFIG_HOTPLUG=n
	fi
	write_bool CONFIG_HOTPLUG

# test to see if __KERNEL__ is defined in KERNEL_CFLAGS
# if not, $KERNEL_CFLAGS += __KERNEL__

	grep __KERNEL__ < scripts/make.opts > /dev/null
	if [ $? = 1 ] ; then
	    KERNEL_CFLAGS="-D__KERNEL__ -I$LINUX_SRC/include $KERNEL_CFLAGS"
	fi

	dump_str "KERNEL_CFLAGS=$KERNEL_CFLAGS"
	dump_str "KERNEL_MODFLAGS=$KERNEL_MODFLAGS"

#=======================================================================
# If compiling for pcmcia-cs, find the PCMCIA source tree

if [ $PRISM2_PCMCIA = "y" ] ; then
	# Should we build for Kernel based PCMCIA?
	WLAN_KERN_PCMCIA=y
	grep 'define CONFIG_PCMCIA' < $LINUX_SRC/include/linux/autoconf.h > /dev/null
	if [ $? = 1 ] ; then
	    WLAN_KERN_PCMCIA=n
	fi
	write_bool WLAN_KERN_PCMCIA

	# We only need the pcmcia source directory if we're NOT building for
	# kernel PCMCIA. 

	if [ $WLAN_KERN_PCMCIA != "y" ] ; then
	    if [ ! "$PCMCIA_SRC" ] ; then
		if [ -f /sbin/cardctl ] ; then
			PCMCIA_SRC=`/sbin/cardctl -V 2>&1 | sed -e 's/cardctl version //'`
			PCMCIA_SRC=/usr/src/pcmcia-cs-$PCMCIA_SRC
		fi 	
	    fi
	    ask_str "pcmcia-cs source dir" PCMCIA_SRC

	    if [ ! -f $PCMCIA_SRC/Makefile ] ; then
		$ECHO "pcmcia-cs source tree $PCMCIA_SRC is incomplete or missing!"
		$ECHO "The wlan driver for pcmcia cannot be built without "
		$ECHO "the pcmcia-cs source tree present and configured."
		fail
	    fi
	    if [ ! -f $PCMCIA_SRC/include/pcmcia/config.h ] ; then
		$ECHO "The pcmcia-cs source tree does not appear to be configured."
		$ECHO "The wlan driver for pcmcia cannot be built without "\
		$ECHO "the pcmcia-cs source tree present and configured."
		fail
	    fi
	    $ECHO ""

            # Now we need to generate the module options flags.
	    # It's only relevant if modversions is turned on.
	    grep CONFIG_MODVERSIONS=y < $PCMCIA_SRC/config.mk > /dev/null
	    if [ $? = 0 ] ; then
		PCMCIA_MODFLAGS="-DMODULE -DMODVERSIONS -include $PCMCIA_SRC/include/linux/modversions.h"
	    else
		PCMCIA_MODFLAGS="-DMODULE"
	    fi
	    
	    # new versions of pcmcia-cs don't generate their own modversion.h
	    # if they don't have it, use the kernel module flags instead.
	    if [ ! -f $PCMCIA_SRC/include/linux/modversions.h ] ; then
		PCMCIA_MODFLAGS="$KERNEL_MODFLAGS"
	    fi
	    dump_str "PCMCIA_MODFLAGS=$PCMCIA_MODFLAGS"
	fi

fi
#=======================================================================
# Alternate target install root dir - the value of this variable
# will prefix other variables, such as modules and pcmcia directories
ask_str "Alternate target install root directory on host" TARGET_ROOT_ON_HOST

if [ $PRISM2_PCMCIA = "y" ] ; then
	# PCMCIA script dir
	ask_str "PCMCIA script directory" PCMCIA_DIR
	TARGET_PCMCIA_DIR=$TARGET_ROOT_ON_HOST$PCMCIA_DIR
	write_str TARGET_PCMCIA_DIR
fi

MODDIR=/lib/modules/$SRC_RELEASE
ask_str "  Module install directory" MODDIR
TARGET_MODDIR=$TARGET_ROOT_ON_HOST$MODDIR/linux-wlan-ng
write_str TARGET_MODDIR
$ECHO ""


# Just write some out (we're not prompting right now)
write_str INST_EXEDIR
TARGET_INST_EXEDIR=$TARGET_ROOT_ON_HOST$INST_EXEDIR
write_str TARGET_INST_EXEDIR

#=======================================================================

# How should the startup scripts be configured?

SYSV_INIT=n
if [ "$PREFIX" = "" ] ; then
	if [ -d /etc/rc.d/init.d -o -d /etc/init.d -o -d /sbin/init.d ] ; then
	$ECHO "It looks like you have a System V init file setup."
	SYSV_INIT=y
	if [ -d /etc/rc.d/init.d ] ; then
		$ECHO "RC_DIR=/etc/rc.d" >> $CONFIG
		$ECHO "RC_DIR=/etc/rc.d" >> $CONFIG_MK
	elif [ -d /sbin/init.d ] ; then
		$ECHO "RC_DIR=/sbin" >> $CONFIG
		$ECHO "RC_DIR=/sbin" >> $CONFIG_MK
	else
		$ECHO "RC_DIR=/etc" >> $CONFIG
		$ECHO "RC_DIR=/etc" >> $CONFIG_MK
	fi
	else
	$ECHO "It looks like you have a BSD-ish init file setup."
	if ! grep rc.wlan /etc/rc.d/rc.S >/dev/null ; then
		$ECHO "    You'll need to edit /etc/rc.d/rc.S to invoke" \
		 "/etc/rc.d/rc.wlan (for ISA/PCMCIA cards)"
		$ECHO "    so that wlan cards will be started at boot time."
	fi
	SYSV_INIT=n
	fi
	write_bool SYSV_INIT
else
	ask_bool "System V init script layout" SYSV_INIT
	if [ "$SYSV_INIT" = "y" ] ; then
	ask_str "Top-level directory for RC scripts" RC_DIR
	fi
fi

if [ ! -x $TARGET_ROOT_ON_HOST/sbin/depmod ] ; then INSTALL_DEPMOD=n ; fi
write_bool INSTALL_DEPMOD

$ECHO ""

#=======================================================================
# Make sure our target architecture is correct

$ECHO ""

ask_str "Prefix for build host compiler? (rarely needed)" HOST_COMPILE
dump_str "HOST_CFLAGS=$HOST_CFLAGS"

$ECHO ""

dump_str 'HOST_AS=$(HOST_COMPILE)as'
dump_str 'HOST_LD=$(HOST_COMPILE)ld'
dump_str 'HOST_CC=$(HOST_COMPILE)gcc'
dump_str 'HOST_CPP=$(HOST_CC) -E'
dump_str 'HOST_AR=$(HOST_COMPILE)ar'
dump_str 'HOST_NM=$(HOST_COMPILE)nm'
dump_str 'HOST_STRIP=$(HOST_COMPILE)strip'
dump_str 'HOST_OBJCOPY=$(HOST_COMPILE)objcopy'
dump_str 'HOST_OBJDUMP=$(HOST_COMPILE)objdump'
dump_str 'HOST_RANLIB=$(HOST_COMPILE)ranlib'
dump_str 'HOST_MAKE=make'

CROSS_COMPILE_ENABLED=y
if [ "_$CROSS_COMPILE" = "_" ] ; then
CROSS_COMPILE_ENABLED=n
fi

write_str CROSS_COMPILE
write_bool CROSS_COMPILE_ENABLED
#dump_str 'CFLAGS=-O2 -Wall -Wstrict-prototypes -pipe'

if [ "_$CROSS_COMPILE" = "_" ] ; then
dump_str 'AS=$(HOST_COMPILE)as'
dump_str 'LD=$(HOST_COMPILE)ld'
dump_str 'CC=$(HOST_COMPILE)gcc'
dump_str 'CPP=$(HOST_CC) -E'
dump_str 'AR=$(HOST_COMPILE)ar'
dump_str 'NM=$(HOST_COMPILE)nm'
dump_str 'STRIP=$(HOST_COMPILE)strip'
dump_str 'OBJCOPY=$(HOST_COMPILE)objcopy'
dump_str 'OBJDUMP=$(HOST_COMPILE)objdump'
dump_str 'RANLIB=$(HOST_COMPILE)ranlib'
dump_str 'MAKE=make'
else
dump_str "AS=$CROSS_COMPILE"as
dump_str "LD=$CROSS_COMPILE"ld
dump_str "CC=$CROSS_COMPILE"gcc
CC="$CROSS_COMPILE"gcc
dump_str "CPP=$CC -E"
dump_str "AR=$CROSS_COMPILE"ar
dump_str "NM=$CROSS_COMPILE"nm
dump_str "STRIP=$CROSS_COMPILE"strip
dump_str "OBJCOPY=$CROSS_COMPILE"objcopy
dump_str "OBJDUMP=$CROSS_COMPILE"objdump
dump_str "RANLIB=$CROSS_COMPILE"ranlib
dump_str "MAKE=make"
fi

#=======================================================================
# Should we build for debugging?

ask_bool "Build for debugging (see doc/config.debug)" WLAN_DEBUG

$ECHO ""

FIRMWARE_DIR="/etc/wlan/"
write_str FIRMWARE_DIR

WLAN_SRC=`pwd`/src/
write_str WLAN_SRC

mv $CONFIG config.out

$ECHO ""
$ECHO "Configuration successful.  Now type 'make' and pray."
$ECHO ""