1 files changed, 83 insertions, 0 deletions
diff --git a/modules.d/90ppcmac/module-setup.sh b/modules.d/90ppcmac/module-setup.sh
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+++ b/modules.d/90ppcmac/module-setup.sh
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+#!/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=${DRACUT_ARCH:-$(uname -m)}
+    # only for PowerPC Macs
+    [[ $_arch == ppc* && $_arch != ppc64le ]] || return 1
+    return 0
+}
+
+# called by dracut
+depends() {
+    return 0
+}
+
+# called by dracut
+installkernel() {
+    pmac_model() {
+        local pm_model
+        pm_model="$(grep model /proc/cpuinfo)"
+        echo "${pm_model##*: }"
+    }
+
+    # only PowerMac3,6 has a module, special case
+    if [[ ${DRACUT_ARCH:-$(uname -m)} != ppc64* ]]; 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"
+}