SystemD services & "reboot" using kexec (#1)

* Add: systemd services

* add --reboot on m2_exec.sh to kexec into the running kernel

* rem reboot from m2_exec.sh

README.md

@@ -1,6 +1,29 @@
 # ps5-linux-tools
 
 - `ps5_control.c`: Allows turning on/off fan and boost via `/dev/icc` and `/dev/mp1`.
+- `systemd/ps5fan.service`: Starts fan control at boot by running `ps5_control --fan on`.
+- `systemd/ps5boost.service`: Starts boost mode at boot by running `ps5_control --boost on`.
+- `install.sh`: Builds `ps5_control`, installs the systemd services, and enables fan and boost at startup.
 - `m2_init.c`: Creates a fake MBR header and GPT partition that makes PS5 OS happy.
 - `m2_install.sh`: Installs a Linux `.img` file by formatting the M.2 as ext4 and copying files over.
 - `m2_exec.sh`: Performs kexec into Linux on your M.2 SSD.
+
+## Systemd services
+
+Install the binary and enable both services:
+
+```sh
+sudo ./install.sh
+```
+
+The installer places `ps5_control` at `/usr/local/sbin/ps5_control` and installs:
+
+- `ps5fan.service`, which runs `/usr/local/sbin/ps5_control --fan on`
+- `ps5boost.service`, which runs `/usr/local/sbin/ps5_control --boost on`
+
+Disable either service if you do not want it at startup:
+
+```sh
+sudo systemctl disable --now ps5fan.service
+sudo systemctl disable --now ps5boost.service
+```

install.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+BINARY_NAME="ps5_control"
+INSTALL_BIN="/usr/local/sbin/${BINARY_NAME}"
+SYSTEMD_DIR="/etc/systemd/system"
+
+usage() {
+    cat <<EOF
+Usage: sudo $0
+
+Installs:
+  ${INSTALL_BIN}
+  ${SYSTEMD_DIR}/ps5fan.service
+  ${SYSTEMD_DIR}/ps5boost.service
+
+Both services are enabled and started by default. Disable either one with:
+  sudo systemctl disable --now ps5fan.service
+  sudo systemctl disable --now ps5boost.service
+EOF
+}
+
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        -h|--help)
+            usage
+            exit 0
+            ;;
+        *)
+            echo "This installer does not accept options: $1" >&2
+            usage >&2
+            exit 1
+            ;;
+    esac
+    shift
+done
+
+if [[ ${EUID} -ne 0 ]]; then
+    echo "Run as root: sudo $0" >&2
+    exit 1
+fi
+
+if ! command -v systemctl >/dev/null 2>&1; then
+    echo "systemctl not found; this installer requires systemd." >&2
+    exit 1
+fi
+
+SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+cd "${SCRIPT_DIR}"
+
+echo "Building ${BINARY_NAME}..."
+make "${BINARY_NAME}"
+
+echo "Installing ${INSTALL_BIN}..."
+install -Dm755 "${BINARY_NAME}" "${INSTALL_BIN}"
+
+echo "Installing systemd units..."
+install -Dm644 systemd/ps5fan.service "${SYSTEMD_DIR}/ps5fan.service"
+install -Dm644 systemd/ps5boost.service "${SYSTEMD_DIR}/ps5boost.service"
+
+systemctl daemon-reload
+
+echo "Enabling and starting ps5fan.service and ps5boost.service..."
+systemctl enable --now ps5fan.service ps5boost.service
+
+echo "Done."
+echo "Disable services you do not want:"
+echo "  sudo systemctl disable --now ps5fan.service"
+echo "  sudo systemctl disable --now ps5boost.service"

m2_exec.sh

@@ -7,6 +7,7 @@ fi
 
 NVME_PART="/dev/nvme0n1p1"
 MNT="/tmp/kexec_mnt"
+
 ROOT_LABEL=$(blkid -s LABEL -o value "$NVME_PART")
 
 if [ -z "$ROOT_LABEL" ]; then

systemd/ps5boost.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Enable PS5 boost mode
+After=dev-mp1.device
+ConditionPathExists=/dev/mp1
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/ps5_control --boost on
+ExecStop=/usr/local/sbin/ps5_control --boost off
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target

systemd/ps5fan.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Enable PS5 fan control
+After=dev-icc.device
+ConditionPathExists=/dev/icc
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/ps5_control --fan on
+ExecStop=/usr/local/sbin/ps5_control --fan off
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target