From e21d9fcf37eda86b01f1335c76cf72654dcf76ab Mon Sep 17 00:00:00 2001
From: Matthias Kruk <m@m10k.eu>
Date: Mon, 22 Mar 2021 09:46:46 +0900
Subject: [PATCH] include/acpi: Add modules for querying battery and PSU state

This commit adds the acpi/battery and acpi/ac module which can be used
to query the state of batteries and power supply units in the system
through the kernel's sysfs ACPI interface.
---
 include/acpi/ac.sh      | 19 ++++++++++++
 include/acpi/battery.sh | 66 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 include/acpi/ac.sh
 create mode 100644 include/acpi/battery.sh

diff --git a/include/acpi/ac.sh b/include/acpi/ac.sh
new file mode 100644
index 0000000..4ada7ba
--- /dev/null
+++ b/include/acpi/ac.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+__init() {
+	declare -gr __acpi_ac_path="/sys/class/power_supply"
+
+	return 0
+}
+
+acpi_ac_get_state() {
+	local psu
+
+	psu="$1"
+
+	if ! cat "$__acpi_ac_path/$psu/online" 2>/dev/null; then
+		return 1
+	fi
+
+	return 0
+}
diff --git a/include/acpi/battery.sh b/include/acpi/battery.sh
new file mode 100644
index 0000000..9f0386f
--- /dev/null
+++ b/include/acpi/battery.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+
+__init() {
+	declare -gr __acpi_battery_path="/sys/class/power_supply"
+
+	return 0
+}
+
+acpi_battery_get_charge_full() {
+	local battery
+
+	battery="$1"
+
+	if cat "$__acpi_battery_path/$battery/charge_full" 2>/dev/null; then
+		return 0
+	fi
+
+	if cat "$__acpi_battery_path/$battery/energy_full" 2>/dev/null; then
+		return 0
+	fi
+
+	return 1
+}
+
+acpi_battery_get_charge_now() {
+	local battery
+
+	battery="$1"
+
+	if cat "$__acpi_battery_path/$battery/charge_now" 2>/dev/null; then
+		return 0
+	fi
+
+	if cat "$__acpi_battery_path/$battery/energy_now" 2>/dev/null; then
+		return 0
+	fi
+
+	return 1
+}
+
+acpi_battery_get_level() {
+	local battery
+
+        local full
+	local now
+	local lvl
+
+	battery="$1"
+
+	if ! full=$(acpi_battery_get_charge_full "$battery"); then
+		return 1
+	fi
+
+	if ! now=$(acpi_battery_get_charge_now "$battery"); then
+		return 1
+	fi
+
+	if (( full == 0 )); then
+		return 1
+	fi
+
+	lvl=$((now * 100 / full))
+	echo "$lvl"
+
+	return 0
+}
-- 
2.47.3