Add systemd targets and services to set SB2 perf_mode

setup-surfacebook-powertarget.sh

#!/bin/sh

echo "Creating systemd ac.target."

cat > /etc/systemd/system/ac.target << 'EOF'
[Unit]
Description=On AC power
DefaultDependencies=no
StopWhenUnneeded=yes
EOF

echo "Creating systemd battery.target."

cat > /etc/systemd/system/battery.target << 'EOF'
[Unit]
Description=On battery power
DefaultDependencies=no
StopWhenUnneeded=yes
EOF

echo "Creating udev rule for systemd targets."

cat > /etc/udev/rules.d/99-powertargets.rules << 'EOF'
SUBSYSTEM=="power_supply", KERNEL=="ADP1", ATTR{online}=="0", RUN+="/usr/sbin/systemctl start battery.target"
SUBSYSTEM=="power_supply", KERNEL=="ADP1", ATTR{online}=="1", RUN+="/usr/sbin/systemctl start ac.target"
EOF

udevadm control --reload-rules

echo "Creating systemd powerdown.service."

cat > /etc/systemd/system/powerdown.service << 'EOF'
[Unit]
Description=Set power state to power-saving on battery

[Service]
Type=oneshot
ExecStart=/bin/bash -c "echo 2 | tee '/sys/devices/platform/MSHW0107:00/perf_mode'; echo 'PERFORMANCE STATE set to battery saver'"

[Install]
WantedBy=battery.target
EOF

echo "Creating systemd powerup.service."

cat > /etc/systemd/system/powerup.service << 'EOF'
[Unit]
Description=Set power state to best on AC

[Service]
Type=oneshot
ExecStart=/bin/bash -c "echo 4 | tee '/sys/devices/platform/MSHW0107:00/perf_mode'; echo 'PERFORMANCE STATE set to best'"

[Install]
WantedBy=ac.target
EOF

echo "Enabling services."
systemctl enable powerdown
systemctl enable powerup