modules.d: add a module for early fan control on PowerPC Macs

The goal of this module is to enable automatic loading of the
thermal/fan control modules on PowerPC based Macs, as on some
modular kernel configurations this will not happen automatically
which will result in the fans spinning up to 100% until they are
manually loaded.

This is especially a problem in live systems where it takes some
time to boot up and the spin-up happens before the system even
leaves initramfs.

diff --git a/modules.d/90ppcmac/load-thermal.sh b/modules.d/90ppcmac/load-thermal.sh
new file mode 100644 (file)
index 0000000..1e548f0
--- /dev/null
+++ b/modules.d/90ppcmac/load-thermal.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+#
+# This hook attempts to load the appropriate thermal modules
+# for PowerPC Macs depending on the specific machine you have.
+
+[ -r /proc/cpuinfo ] || exit 0
+
+load_windfarm() {
+    local pm_model="$(sed -n '/model/p' /proc/cpuinfo)"
+    pm_model="${pm_model##*: }"
+
+    # load quietly and respect the blacklist
+    # this way if the modules are for some reason missing, it will
+    # still exit successfully and not affect the boot process
+    case "$pm_model" in
+        PowerMac3,6)             modprobe -b -q therm_windtunnel ;;
+        PowerMac7,2|PowerMac7,3) modprobe -b -q windfarm_pm72    ;;
+        PowerMac8,1|PowerMac8,2) modprobe -b -q windfarm_pm81    ;;
+        PowerMac9,1)             modprobe -b -q windfarm_pm91    ;;
+        PowerMac11,2)            modprobe -b -q windfarm_pm112   ;;
+        PowerMac12,1)            modprobe -b -q windfarm_pm121   ;;
+        RackMac3,1)              modprobe -b -q windfarm_rm31    ;;
+        *) ;;
+    esac
+
+    return 0
+}
+
+load_windfarm

diff --git a/modules.d/90ppcmac/module-setup.sh b/modules.d/90ppcmac/module-setup.sh
new file mode 100644 (file)
index 0000000..59221ec
--- /dev/null
+++ b/modules.d/90ppcmac/module-setup.sh
@@ -0,0 +1,82 @@
+#!/bin/bash
+#
+# This module attempts to properly deal with thermal behavior on PowerPC
+# based Mac systems, by installing the model-appropriate (when hostonly)
+# or all (when not) fan control/thermal kernel modules and loading them
+# in a hook.
+#
+# While this is not strictly necessary for all kernels, particularly
+# modular kernels will not autoload those drivers, even once the full
+# system is up, which results in the fans spinning up to 100%; this is
+# particularly annoying on live systems, where the system takes a while
+# to load, so it's best to load the drivers early in initramfs stage.
+#
+# The behavior of this is inspired by the thermal hook in Debian's
+# initramfs-tools, but written for dracut specifically and updated
+# for modern kernels (2012+).
+
+# called by dracut
+check() {
+    local _arch="$(uname -m)"
+    # only for PowerPC Macs
+    [[ "$_arch" == ppc* && "$_arch" != ppc*le ]] || return 1
+    return 0
+}
+
+# called by dracut
+depends() {
+    return 0
+}
+
+# called by dracut
+installkernel() {
+    pmac_model() {
+        local pm_model="$(grep model /proc/cpuinfo)"
+        echo "${pm_model##*: }"
+    }
+
+    # only PowerMac3,6 has a module, special case
+    if [[ "$(uname -m)" == ppc ]]; then
+        if ! [[ $hostonly ]] || [[ "$(pmac_model)" == "PowerMac3,6" ]]; then
+            instmods therm_windtunnel
+        fi
+        return 0
+    fi
+
+    windfarm_modules() {
+        if ! [[ $hostonly ]]; then
+            # include all drivers when not hostonly
+            instmods \
+                windfarm_pm72 windfarm_pm81 windfarm_pm91 windfarm_pm112 \
+                windfarm_pm121 windfarm_rm31
+        else
+            # guess model specific module, then install the rest
+            case "$(pmac_model)" in
+                PowerMac7,2|PowerMac7,3) instmods windfarm_pm72  ;;
+                PowerMac8,1|PowerMac8,2) instmods windfarm_pm81  ;;
+                PowerMac9,1)             instmods windfarm_pm91  ;;
+                PowerMac11,2)            instmods windfarm_pm112 ;;
+                PowerMac12,1)            instmods windfarm_pm121 ;;
+                RackMac3,1)              instmods windfarm_rm31  ;;
+                # no match, so skip installation of the rest
+                *) return 1 ;;
+            esac
+        fi
+        return 0
+    }
+
+    # hostonly and didn't match a model; skip installing other modules
+    windfarm_modules || return 0
+    # these are all required by the assorted windfarm_pm*
+    instmods \
+        windfarm_core windfarm_cpufreq_clamp windfarm_pid \
+        windfarm_smu_controls windfarm_smu_sat windfarm_smu_sensors \
+        windfarm_fcu_controls windfarm_ad7417_sensor windfarm_max6690_sensor \
+        windfarm_lm75_sensor windfarm_lm87_sensor
+}
+
+# called by dracut
+install() {
+    # this will attempt to load the appropriate modules 
+    inst_hook pre-udev 99 "$moddir/load-thermal.sh"
+}