# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

EAPI=4

inherit eutils multilib linux-info linux-mod toolchain-funcs versionator

DESCRIPTION="AMD kernel drivers for radeon r600 (HD5000 Series) and newer chipsets"
HOMEPAGE="http://www.amd.com"
MY_V=( $(get_version_components) )
#RUN="${WORKDIR}/amd-driver-installer-9.00-x86.x86_64.run"
SRC_URI="http://www2.ati.com/drivers/linux/amd-driver-installer-catalyst-${PV}-x86.x86_64.zip"
FOLDER_PREFIX="common/"
IUSE="debug multilib x-multilib pax_kernel"

LICENSE="AMD GPL-2 as-is"
KEYWORDS="~amd64 ~x86"
SLOT="1"

RDEPEND="x-multilib? ( ~x11-drivers/ati-userspace-${PV}[x-multilib] )
	multilib? ( ~x11-drivers/ati-userspace-${PV}[multilib] )
	~x11-drivers/ati-userspace-${PV}
	sys-power/acpid"
DEPEND="${RDEPEND}"

S="${WORKDIR}"

_check_kernel_config() {
	local failed=0
	local error=""
	if ! kernel_is ge 2 6; then
		eerror "You need a 2.6 linux kernel to compile against!"
		die "No 2.6 Kernel found"
	fi

	if ! linux_chkconfig_present MTRR; then
		ewarn "You don't have MTRR support enabled in the kernel."
		ewarn "Direct rendering will not work."
	fi

	if linux_chkconfig_builtin DRM; then
		ewarn "You have DRM support built in to the kernel"
		ewarn "Direct rendering will not work."
	fi

	if ! linux_chkconfig_present AGP && \
		! linux_chkconfig_present PCIEPORTBUS; then
		ewarn "You don't have AGP and/or PCIe support enabled in the kernel"
		ewarn "Direct rendering will not work."
	fi

	if ! linux_chkconfig_present ACPI; then
		eerror "${P} requires the ACPI support in the kernel"
		eerror "Please enable it:"
		eerror "    CONFIG_ACPI=y"
		eerror "in /usr/src/linux/.config or"
		eerror "    Power management and ACPI options --->"
		eerror "        [*] Power Management support"
		eerror "in the 'menuconfig'"
		error+=" CONFIG_ACPI disabled;"
		failed=1
	fi

	if ! linux_chkconfig_present PCI_MSI; then
		eerror "${P} requires MSI in the kernel."
		eerror "Please enable it:"
		eerror "    CONFIG_PCI_MSI=y"
		eerror "in /usr/src/linux/.config or"
		eerror "    Bus options (PCI etc.)  --->"
		eerror "        [*] Message Signaled Interrupts (MSI and MSI-X)"
		eerror "in the kernel config."
		error+=" CONFIG_PCI_MSI disabled;"
		failed=1
	fi

	if linux_chkconfig_present LOCKDEP; then
		eerror "You've enabled LOCKDEP -- lock tracking -- in the kernel."
		eerror "Unfortunately, this option exports the symbol lock_acquire as GPL-only."
		eerror "This prevents ${P} from compiling with an error like this:"
		eerror "FATAL: modpost: GPL-incompatible module fglrx.ko uses GPL-only symbol 'lock_acquire'"
		eerror "Please make sure the following options have been unset:"
		eerror "    Kernel hacking  --->"
		eerror "        [ ] Lock debugging: detect incorrect freeing of live locks"
		eerror "        [ ] Lock debugging: prove locking correctness"
		eerror "        [ ] Lock usage statistics"
		eerror "in 'menuconfig'"
		error+=" LOCKDEP enabled;"
		failed=1
	fi

	use amd64 && if ! linux_chkconfig_present COMPAT; then
		eerror "${P} requires COMPAT."
		eerror "Please enable the 32 bit emulation:"
		eerror "Executable file formats / Emulations  --->"
		eerror "    [*] IA32 Emulation"
		eerror "in the kernel config."
		eerror "if this doesn't enable CONFIG_COMPAT add"
		eerror "    CONFIG_COMPAT=y"
		eerror "in /usr/src/linux/.config"
		error+=" COMPAT disabled;"
		failed=1
	fi

	kernel_is ge 2 6 37 && kernel_is le 2 6 38 && if ! linux_chkconfig_present BKL ; then
		eerror "${P} requires BKL."
		eerror "Please enable the Big Kernel Lock:"
		eerror "Kernel hacking  --->"
		eerror "    [*] Big Kernel Lock"
		eerror "in the kernel config."
		eerror "or add"
		eerror "    CONFIG_BKL=y"
		eerror "in /usr/src/linux/.config"
		error+=" BKL disabled;"
		failed=1
	fi

	[[ ${failed} -ne 0 ]] && die "${error}"
}

pkg_pretend() {
	# workaround until bug 365543 is solved
	linux-info_pkg_setup
	require_configured_kernel
	_check_kernel_config
}

pkg_setup() {
	MODULE_NAMES="fglrx(video:${S}/${FOLDER_PREFIX}/lib/modules/fglrx/build_mod/2.6.x)"
	BUILD_TARGETS="kmod_build"
	linux-mod_pkg_setup
	BUILD_PARAMS="GCC_VER_MAJ=$(gcc-major-version) KVER=${KV_FULL} KDIR=${KV_DIR}"
	BUILD_PARAMS="${BUILD_PARAMS} CFLAGS_MODULE+=\"-DMODULE -DATI -DFGL\""
	if grep -q arch_compat_alloc_user_space ${KV_DIR}/arch/x86/include/asm/compat.h ; then
		BUILD_PARAMS="${BUILD_PARAMS} CFLAGS_MODULE+=-DCOMPAT_ALLOC_USER_SPACE=arch_compat_alloc_user_space"
	else
		BUILD_PARAMS="${BUILD_PARAMS} CFLAGS_MODULE+=-DCOMPAT_ALLOC_USER_SPACE=compat_alloc_user_space"
	fi

	# amd64/x86
	if use amd64 ; then
		MY_BASE_DIR="${BASE_DIR}_64a"
		PKG_LIBDIR=lib64
		ARCH_DIR="${S}/arch/x86_64"
	else
		MY_BASE_DIR="${BASE_DIR}"
		PKG_LIBDIR=lib
		ARCH_DIR="${S}/arch/x86"
	fi

	# Define module dir.
	MODULE_DIR="${S}/${FOLDER_PREFIX}/lib/modules/fglrx/build_mod"

	elog
	elog "Please note that this driver supports only graphic cards based on"
	elog "Evergreen chipset and newer."
	elog "This represent the AMD Radeon HD 5400+ series at this moment."
	elog
	elog "If your card is older then use ${CATEGORY}/xf86-video-ati"
	elog "For migration informations please reffer to:"
	elog "http://www.gentoo.org/proj/en/desktop/x/x11/ati-migration-guide.xml"
	einfo
}

src_unpack() {
	if [[ ${A} =~ .*\.tar\.gz ]]; then
		unpack ${A}
	else
		#please note, RUN may be insanely assigned at top near SRC_URI
		if [[ ${A} =~ .*\.zip ]]; then
			unpack ${A}
			[[ -z "$RUN" ]] && RUN="${S}/${A/%.zip/.run}"
		else
			RUN="${DISTDIR}/${A}"
		fi
		sh ${RUN} --extract "${S}" 2>&1 > /dev/null || die
	fi
}

src_prepare() {
	# version patches
	# epatch "${FILESDIR}"/kernel/${PV}-*.patch
	if use debug; then
		sed -i '/^#define DRM_DEBUG_CODE/s/0/1/' \
			"${MODULE_DIR}/firegl_public.c" \
			|| die "Failed to enable debug output."
	fi

	# see http://ati.cchtml.com/show_bug.cgi?id=495
	#epatch "${FILESDIR}"/ati-drivers-old_rsp.patch
	# first hunk applied upstream second (x32 related) was not
	epatch "${FILESDIR}"/ati-drivers-x32_something_something.patch

	# compile fix for linux-3.7
	# https://bugs.gentoo.org/show_bug.cgi?id=438516
	epatch "${FILESDIR}/ati-drivers-vm-reserverd.patch"

	cd "${MODULE_DIR}"
	# bugged fglrx build system, this file should be copied by hand
	cp "${ARCH_DIR}"/lib/modules/fglrx/build_mod/libfglrx_ip.a 2.6.x

	convert_to_m 2.6.x/Makefile || die "convert_to_m failed"

	# When built with ati's make.sh it defines a bunch of macros if
	# certain .config values are set, falling back to less reliable
	# detection methods if linux/autoconf.h is not available. We
	# simply use the linux/autoconf.h settings directly, bypassing the
	# detection script.
	sed -i -e 's/__SMP__/CONFIG_SMP/' *.c *h || die "SMP sed failed"
	sed -i -e 's/ifdef MODVERSIONS/ifdef CONFIG_MODVERSIONS/' *.c *.h \
		|| die "MODVERSIONS sed failed"

	cd "${S}"
	mkdir extra || die "mkdir failed"
	cd extra
	unpack ./../${FOLDER_PREFIX}usr/src/ati/fglrx_sample_source.tgz
}

src_compile() {
	linux-mod_src_compile
}

src_install() {
	linux-mod_src_install
}

pkg_postinst() {
	elog "If you experience unexplained segmentation faults and kernel crashes"
	elog "with this driver and multi-threaded applications such as wine,"
	elog "set UseFastTLS in xorg.conf to either 0 or 1, but not 2."
	linux-mod_pkg_postinst
}

pkg_preinst() {
	linux-mod_pkg_preinst
}

pkg_postrm() {
	linux-mod_pkg_postrm
}