luci-app-battstatus: initial release

Introduce a new package luci-app-battstatus which queries battery charge
information using i2c commands and displays a charge indicator in the
upper right notification area.

So far this package has been tested to work with the HooToo HT-TM05
travel router but might be extended to cover further models in the
future.

Signed-off-by: Russell Morris <rmorris@rkmorris.us>
[rebase on top of master, rewrite commit message, adjust copyright,
 convert some ubus fields to boolean values]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

modules/luci-mod-battstatus/Makefile

@@ -0,0 +1,19 @@
+#
+# Copyright (C) 2020 Russell Morris <rmorris@rkmorris.us>
+#
+# This is free software, licensed under the Apache License, Version 2.0 .
+#
+
+include $(TOPDIR)/rules.mk
+
+LUCI_TITLE:=LuCI Battery Status
+LUCI_DESCRIPTION:=Provides a battery charge indicator in LuCI. Currently only supports the HooToo HT-TM05 travel router.
+
+LUCI_DEPENDS:=+luci-base +libiwinfo-lua +rpcd-mod-iwinfo +libi2c +i2c-tools
+
+PKG_LICENSE:=Apache-2.0
+
+include ../../luci.mk
+
+# call BuildPackage - OpenWrt buildroot signature
+

modules/luci-mod-battstatus/htdocs/luci-static/resources/preload/battstatus.js

@@ -0,0 +1,55 @@
+'use strict';
+'require ui';
+'require rpc';
+'require poll';
+'require baseclass';
+
+var callBatteryStatus = rpc.declare({
+	object: 'luci.battstatus',
+	method: 'getBatteryStatus',
+	expect: { '': {} }
+});
+
+var devices = {};
+
+return baseclass.extend({
+	__init__: function() {
+		this.updateIndicator();
+		poll.add(L.bind(this.updateIndicator, this), 5);
+	},
+
+	updateIndicator: function() {
+		return callBatteryStatus().then(L.bind(function(devs) {
+			for (var dev in devs) {
+				var info = devs[dev];
+				if (info.valid) {
+					info.status = (info.charging ? _('Charging') : _('Not Charging')) + ": " + info.percentage + "%";
+					info.state = "active";
+					if (info.percentage <= 20)
+						info.color = "Red";
+					else if (info.percentage <= 30)
+						info.color = "GoldenRod";
+				} else {
+					info.status = info.message;
+					info.state = "inactive";
+				}
+
+				info.name = "battery-" + dev.replace(" ", "-");
+				ui.showIndicator(info.name, info.status, null, info.state);
+				if (typeof info.color != 'undefined') {
+					info.element = document.querySelector(`[data-indicator="${info.name}"]`);
+					info.element.innerHTML = `<span style="color:${info.color}">${info.status}</span>`;
+				}
+
+				devices[dev] = info;
+			}
+
+			for (var dev in devices) {
+				if (!devs.hasOwnProperty(dev)) {
+					ui.hideIndicator('battery-%s'.format(dev));
+					delete devices[dev];
+				}
+			}
+		}, this));
+	}
+});

modules/luci-mod-battstatus/root/usr/libexec/rpcd/luci.battstatus

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+. /usr/share/libubox/jshn.sh
+
+case "$1" in
+	list)
+		printf '{ "getBatteryStatus": {} }'
+	;;
+	call)
+		case "$2" in
+			getBatteryStatus)
+				json_init
+
+				eval $(/bin/ubus call system board 2>/dev/null | /usr/bin/jsonfilter -e 'MODEL=@.model')
+				json_add_object "$MODEL"
+
+				if [ -f /usr/sbin/i2cset ] && [ -f /usr/sbin/i2cget ]; then
+					json_add_boolean valid 1
+					if [ $(i2cset -y 0 0x0a 0x0a 0x01 && i2cget -y 0 0x0a 0x0a) = 0x40 ]; then
+						json_add_boolean charging 1
+					else
+						json_add_boolean charging 0
+					fi
+					json_add_int percentage $(i2cset -y 0 0x0a 0x0a 0x10 && i2cget -y 0 0x0a 0x0a | xargs printf %d)
+				else
+					json_add_boolean valid 0
+					if [ ! -f /usr/sbin/i2cset ]; then
+						json_add_string message "Need i2cset"
+					else
+						json_add_string message "Need i2cget"
+					fi
+				fi
+
+				json_close_object
+				json_dump
+			;;
+		esac
+	;;
+esac

modules/luci-mod-battstatus/root/usr/share/rpcd/acl.d/luci-mod-battstatus.json

@@ -0,0 +1,10 @@
+{
+	"luci-mod-battstatus": {
+		"description": "Grant access to battery status",
+		"read": {
+			"ubus": {
+				"luci.battstatus": [ "getBatteryStatus" ]
+			}
+		}
+	}
+}