From a36600126b0c9c22f16c56029765d8ce06f7a7a2 Mon Sep 17 00:00:00 2001
From: Przemek Grondek <pgrondek@gmail.com>
Date: Thu, 14 Jul 2022 21:06:42 +0200
Subject: [PATCH] Add battery charge limiter for laptop

---
 .../system/battery-charge-threshold.service    | 12 ++++++++++++
 roles/laptop/tasks/battery.yml                 | 18 ++++++++++++++++++
 roles/laptop/tasks/main.yml                    |  1 +
 3 files changed, 31 insertions(+)
 create mode 100644 roles/laptop/files/lib/systemd/system/battery-charge-threshold.service
 create mode 100644 roles/laptop/tasks/battery.yml
 create mode 100644 roles/laptop/tasks/main.yml

diff --git a/roles/laptop/files/lib/systemd/system/battery-charge-threshold.service b/roles/laptop/files/lib/systemd/system/battery-charge-threshold.service
new file mode 100644
index 0000000..be18e16
--- /dev/null
+++ b/roles/laptop/files/lib/systemd/system/battery-charge-threshold.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=Set the battery charge threshold
+After=multi-user.target
+StartLimitBurst=0
+
+[Service]
+Type=oneshot
+Restart=on-failure
+ExecStart=/bin/bash -c 'echo 80 > /sys/class/power_supply/BAT0/charge_control_end_threshold'
+
+[Install]
+WantedBy=multi-user.target
\ No newline at end of file
diff --git a/roles/laptop/tasks/battery.yml b/roles/laptop/tasks/battery.yml
new file mode 100644
index 0000000..c6ad9bb
--- /dev/null
+++ b/roles/laptop/tasks/battery.yml
@@ -0,0 +1,18 @@
+- name: Check if laptop has option to limit battery
+  stat:
+    path: /sys/class/power_supply/BAT0/charge_control_end_threshold
+  register: battery_limiter_available
+
+- when: battery_limiter_available.stat.exists
+  block:
+    - name: Copy service to limit battery charge
+      become: yes
+      copy:
+        src: lib/systemd/system/battery-charge-threshold.service
+        dest: /lib/systemd/system/battery-charge-threshold.service
+
+    - name: Enable battery limit service
+      become: yes
+      systemd:
+        name: battery-charge-threshold
+        enabled: yes
diff --git a/roles/laptop/tasks/main.yml b/roles/laptop/tasks/main.yml
new file mode 100644
index 0000000..cdda24d
--- /dev/null
+++ b/roles/laptop/tasks/main.yml
@@ -0,0 +1 @@
+- import_tasks: battery.yml