feat(bluetooth): implement bluetooth support in initrd

- Included a bluetooth module that installs modules, firmware, udev rules and bluetoothd.
- systemd and dbus are required by bluetoothd
- Include bluetooth by default if BT keyboard or combo found

dracut.spec

@@ -343,6 +343,7 @@ echo 'dracut_rescue_image="yes"' > $RPM_BUILD_ROOT%{dracutlibdir}/dracut.conf.d/
 %{dracutlibdir}/modules.d/45url-lib
 %{dracutlibdir}/modules.d/50drm
 %{dracutlibdir}/modules.d/50plymouth
+%{dracutlibdir}/modules.d/62bluetooth
 %{dracutlibdir}/modules.d/80lvmmerge
 %{dracutlibdir}/modules.d/90btrfs
 %{dracutlibdir}/modules.d/90crypt

modules.d/62bluetooth/module-setup.sh

@@ -0,0 +1,74 @@
+#!/bin/sh
+# This file is part of dracut.
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Prerequisite check(s) for module.
+check() {
+    # If the binary(s) requirements are not fulfilled the module can't be installed
+    require_any_binary /usr/lib/bluetooth/bluetoothd /usr/libexec/bluetooth/bluetoothd || return 1
+    # Include by default if a Peripheral (0x500) is found of minor class:
+    #  * Keyboard (0x40)
+    #  * Keyboard/pointing (0xC0)
+    grep -qiE 'Class=0x[0-9a-f]{3}5[4c]0' /var/lib/bluetooth/*/*/info 2> /dev/null && return 0
+
+    return 255
+}
+
+# Module dependency requirements.
+depends() {
+    # This module has external dependencies on the systemd and dbus modules.
+    echo systemd dbus
+    # Return 0 to include the dependent modules in the initramfs.
+    return 0
+}
+
+installkernel() {
+    instmods bluetooth btrtl btintel btbcm bnep ath3k btusb rfcomm hidp
+    inst_multiple -o \
+        /usr/lib/firmware/ar3k/AthrBT* \
+        /usr/lib/firmware/ar3k/ramps* \
+        /usr/lib/firmware/ath3k-1.fw \
+        /usr/lib/firmware/BCM2033-MD.hex \
+        /usr/lib/firmware/bfubase.frm \
+        /usr/lib/firmware/BT3CPCC.bin \
+        /usr/lib/firmware/brcm/*.hcd \
+        /usr/lib/firmware/mediatek/mt7622pr2h.bin \
+        /usr/lib/firmware/qca/nvm* \
+        /usr/lib/firmware/qca/crnv* \
+        /usr/lib/firmware/qca/rampatch* \
+        /usr/lib/firmware/qca/crbtfw* \
+        /usr/lib/firmware/rtl_bt/* \
+        /usr/lib/firmware/intel/ibt* \
+        /usr/lib/firmware/ti-connectivity/TIInit_* \
+        /usr/lib/firmware/nokia/bcmfw.bin \
+        /usr/lib/firmware/nokia/ti1273.bin
+
+}
+
+# Install the required file(s) for the module in the initramfs.
+install() {
+    inst_multiple \
+        $(find /usr/libexec/bluetooth/bluetoothd /usr/lib/bluetooth/bluetoothd 2> /dev/null || :) \
+        "${systemdsystemunitdir}/bluetooth.target" \
+        "${systemdsystemunitdir}/bluetooth.service" \
+        bluetoothctl
+
+    if [[ $hostonly ]]; then
+        inst_multiple \
+            /etc/bluetooth/main.conf \
+            /etc/dbus-1/system.d/bluetooth.conf
+    fi
+
+    inst_multiple $(find /var/lib/bluetooth)
+
+    inst_rules 69-btattach-bcm.rules 60-persistent-input.rules
+
+    sed -i -e \
+        '/^\[Unit\]/aDefaultDependencies=no\
+        Conflicts=shutdown.target\
+        Before=shutdown.target\
+        After=dbus.service' \
+        "${initdir}/${systemdsystemunitdir}/bluetooth.service"
+
+    $SYSTEMCTL -q --root "$initdir" enable bluetooth.service
+}