Add system76-io-module package from khoverlay

app-laptop/system76-io-module/files/system76-io+thelio.conf

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+system76-io
+system76-thelio-io

app-laptop/system76-io-module/files/system76-io.conf

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+system76-io

app-laptop/system76-io-module/system76-io-module-9999.ebuild

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+# Copyright 2020-2022 Bryan Gardiner <bog@khumba.net>
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit linux-mod-r1 git-r3
+
+DESCRIPTION="System76 I/O Board Driver"
+HOMEPAGE="https://github.com/pop-os/system76-io-dkms"
+
+EGIT_REPO_URI="https://github.com/pop-os/system76-io-dkms.git"
+EGIT_BRANCH="master"
+EGIT_CHECKOUT_DIR="${WORKDIR}/${PN}"
+EGIT_SUBMODULES=( '*' )
+
+LICENSE="GPL-2+"
+SLOT="0"
+KEYWORDS="amd64"
+
+RDEPEND=""
+DEPEND="${RDEPEND}"
+
+S="${WORKDIR}/${PN}"
+
+src_compile() {
+	local modlist=( "system76-io=misc" "system76-thelio-io=misc" )
+	local modargs=( "KERNEL_DIR=${KERNEL_DIR}" )
+
+	linux-mod-r1_src_compile
+}
+
+src_install() {
+	linux-mod-r1_src_install
+
+	# The system76-io module is present and loaded on Pop!_OS for darp6
+	# in 2020, but it doesn't seem to load on its own on Gentoo.  So we
+	# install a file to ask it to load.
+	#
+	# Not sure about system76-thelio-io, but let's have it autoload too.
+	insinto /usr/lib/modules-load.d
+	newins "${FILESDIR}/system76-io+thelio.conf" system76-io.conf
+}