diff --git a/frontend/device/android/powerd.lua b/frontend/device/android/powerd.lua
index 57e50f222..faabbed73 100644
--- a/frontend/device/android/powerd.lua
+++ b/frontend/device/android/powerd.lua
@@ -4,10 +4,6 @@ local _, android = pcall(require, "android")
 local AndroidPowerD = BasePowerD:new{
     fl_min = 0, fl_max = 25,
     fl_intensity = 10,
-    batt_capacity_file = "/sys/class/power_supply/battery/capacity",
-    is_charging_file = "/sys/class/power_supply/battery/charging_enabled",
-    battCapacity = nil,
-    is_charging = nil,
 }
 
 function AndroidPowerD:init()
@@ -18,13 +14,11 @@ function AndroidPowerD:setIntensityHW()
 end
 
 function AndroidPowerD:getCapacityHW()
-    self.battCapacity = android.getBatteryLevel()
-    return self.battCapacity
+    return android.getBatteryLevel()
 end
 
 function AndroidPowerD:isChargingHW()
-    self.is_charging = android.isCharging()
-    return self.is_charging
+    return android.isCharging()
 end
 
 return AndroidPowerD
diff --git a/frontend/device/generic/powerd.lua b/frontend/device/generic/powerd.lua
index 6a6e52a41..ba4ac7acd 100644
--- a/frontend/device/generic/powerd.lua
+++ b/frontend/device/generic/powerd.lua
@@ -1,14 +1,13 @@
 local logger = require("logger")
 
 local BasePowerD = {
-    fl_min = 0,          -- min frontlight intensity
-    fl_max = 10,         -- max frontlight intensity
-    fl_intensity = nil,  -- frontlight intensity
-    battCapacity = nil,  -- battery capacity
-    device = nil,        -- device object
+    fl_min = 0,                       -- min frontlight intensity
+    fl_max = 10,                      -- max frontlight intensity
+    fl_intensity = nil,               -- frontlight intensity
+    battCapacity = 0,                 -- battery capacity
+    device = nil,                     -- device object
 
-    capacity_pulled_count = 0,
-    capacity_cached_count = 10,
+    last_capacity_pull_time = 0,      -- timestamp of last pull
 }
 
 function BasePowerD:new(o)
@@ -22,8 +21,8 @@ end
 function BasePowerD:init() end
 function BasePowerD:toggleFrontlight() end
 function BasePowerD:setIntensityHW() end
-function BasePowerD:getCapacityHW() return "0" end
-function BasePowerD:isChargingHW() end
+function BasePowerD:getCapacityHW() return 0 end
+function BasePowerD:isChargingHW() return false end
 -- Anything needs to be done before do a real hardware suspend. Such as turn off
 -- front light.
 function BasePowerD:beforeSuspend() end
@@ -66,19 +65,17 @@ function BasePowerD:setIntensity(intensity)
 end
 
 function BasePowerD:getCapacity()
-    if self.capacity_pulled_count == self.capacity_cached_count then
-        self.capacity_pulled_count = 0
-        return self:getCapacityHW()
-    else
-        self.capacity_pulled_count = self.capacity_pulled_count + 1
-        return self.battCapacity or self:getCapacityHW()
+    if os.time() - self.last_capacity_pull_time >= 60 then
+        self.battCapacity = self:getCapacityHW()
+        self.last_capacity_pull_time = os.time()
     end
+    return self.battCapacity
 end
 
 function BasePowerD:refreshCapacity()
     -- We want our next getCapacity call to actually pull up to date info
     -- instead of a cached value ;)
-    self.capacity_pulled_count = self.capacity_cached_count
+    self.last_capacity_pull_time = 0
 end
 
 function BasePowerD:isCharging()
diff --git a/frontend/device/kindle/powerd.lua b/frontend/device/kindle/powerd.lua
index faa146cf4..b0e1a026e 100644
--- a/frontend/device/kindle/powerd.lua
+++ b/frontend/device/kindle/powerd.lua
@@ -5,8 +5,6 @@ local KindlePowerD = BasePowerD:new{
     fl_min = 0, fl_max = 24,
 
     fl_intensity = nil,
-    battCapacity = nil,
-    is_charging = nil,
     lipc_handle = nil,
 
     is_fl_on = false,
@@ -55,20 +53,20 @@ end
 
 function KindlePowerD:getCapacityHW()
     if self.lipc_handle ~= nil then
-        self.battCapacity = self.lipc_handle:get_int_property("com.lab126.powerd", "battLevel")
+        return self.lipc_handle:get_int_property("com.lab126.powerd", "battLevel")
     else
-        self.battCapacity = self:read_int_file(self.batt_capacity_file)
+        return self:read_int_file(self.batt_capacity_file)
     end
-    return self.battCapacity
 end
 
 function KindlePowerD:isChargingHW()
+    local is_charging
     if self.lipc_handle ~= nil then
-        self.is_charging = self.lipc_handle:get_int_property("com.lab126.powerd", "isCharging")
+        is_charging = self.lipc_handle:get_int_property("com.lab126.powerd", "isCharging")
     else
-        self.is_charging = self:read_int_file(self.is_charging_file)
+        is_charging = self:read_int_file(self.is_charging_file)
     end
-    return self.is_charging == 1
+    return is_charging == 1
 end
 
 function KindlePowerD:__gc()
diff --git a/frontend/device/kobo/powerd.lua b/frontend/device/kobo/powerd.lua
index d52a7874a..98bcb4fae 100644
--- a/frontend/device/kobo/powerd.lua
+++ b/frontend/device/kobo/powerd.lua
@@ -19,8 +19,6 @@ local KoboPowerD = BasePowerD:new{
 
     batt_capacity_file = batt_state_folder .. "capacity",
     is_charging_file = batt_state_folder .. "status",
-    battCapacity = nil,
-    is_charging = nil,
 }
 
 function KoboPowerD:init()
@@ -77,13 +75,11 @@ function KoboPowerD:setIntensityHW()
 end
 
 function KoboPowerD:getCapacityHW()
-    self.battCapacity = self:read_int_file(self.batt_capacity_file)
-    return self.battCapacity
+    return self:read_int_file(self.batt_capacity_file)
 end
 
 function KoboPowerD:isChargingHW()
-    self.is_charging = self:read_str_file(self.is_charging_file) == "Charging\n"
-    return self.is_charging
+    return self:read_str_file(self.is_charging_file) == "Charging\n"
 end
 
 -- Turn off front light before suspend.
diff --git a/frontend/device/pocketbook/powerd.lua b/frontend/device/pocketbook/powerd.lua
index 49ab9d838..a1e23c171 100644
--- a/frontend/device/pocketbook/powerd.lua
+++ b/frontend/device/pocketbook/powerd.lua
@@ -7,7 +7,6 @@ int IsCharging();
 ]]
 
 local PocketBookPowerD = BasePowerD:new{
-    battCapacity = nil,
     is_charging = nil,
     batt_capacity_file = "/sys/devices/platform/sun5i-i2c.0/i2c-0/0-0034/axp20-supplyer.28/power_supply/battery/capacity",
     is_charging_file = "/sys/devices/platform/sun5i-i2c.0/i2c-0/0-0034/axp20-supplyer.28/power_supply/battery/status",
@@ -17,8 +16,7 @@ function PocketBookPowerD:init()
 end
 
 function PocketBookPowerD:getCapacityHW()
-    self.battCapacity = self:read_int_file(self.batt_capacity_file)
-    return self.battCapacity
+    return self:read_int_file(self.batt_capacity_file)
 end
 
 function PocketBookPowerD:isChargingHW()
diff --git a/frontend/docsettings.lua b/frontend/docsettings.lua
index 9b7d0a05e..87ef50752 100644
--- a/frontend/docsettings.lua
+++ b/frontend/docsettings.lua
@@ -2,7 +2,6 @@ local lfs = require("libs/libkoreader-lfs")
 local DataStorage = require("datastorage")
 local dump = require("dump")
 local purgeDir = require("ffi/util").purgeDir
-local logger = require("logger")
 
 local DocSettings = {}
 
@@ -23,9 +22,6 @@ function DocSettings:getSidecarDir(doc_path)
     if file_without_suffix then
         return file_without_suffix..".sdr"
     end
-    -- We shouldn't be called with anything but files with registered
-    -- extensions, but in case we are, return something useful
-    logger.err("getSidecarFile called with unexpected path:", doc_path)
     return doc_path..".sdr"
 end
 
diff --git a/frontend/document/credocument.lua b/frontend/document/credocument.lua
index 69e729612..73d204a4f 100644
--- a/frontend/document/credocument.lua
+++ b/frontend/document/credocument.lua
@@ -459,7 +459,9 @@ end
 
 function CreDocument:register(registry)
     registry:addProvider("txt", "application/txt", self)
+    registry:addProvider("log", "application/txt", self)
     registry:addProvider("txt.zip", "application/zip", self)
+    registry:addProvider("log.zip", "application/zip", self)
     registry:addProvider("epub", "application/epub", self)
     registry:addProvider("fb2", "application/fb2", self)
     registry:addProvider("fb2.zip", "application/zip", self)
diff --git a/frontend/luasettings.lua b/frontend/luasettings.lua
index bd8629b7c..a08707329 100644
--- a/frontend/luasettings.lua
+++ b/frontend/luasettings.lua
@@ -60,6 +60,10 @@ function LuaSettings:flipTrue(key)
     end
 end
 
+function LuaSettings:reset(table)
+    self.data = table
+end
+
 function LuaSettings:flush()
     local f_out = io.open(self.file, "w")
     if f_out ~= nil then
diff --git a/frontend/pluginloader.lua b/frontend/pluginloader.lua
index 26e300179..fa39a3352 100644
--- a/frontend/pluginloader.lua
+++ b/frontend/pluginloader.lua
@@ -22,13 +22,14 @@ function PluginLoader:loadPlugins()
             local ok, plugin_module = pcall(dofile, mainfile)
             if not ok or not plugin_module then
                 logger.warn("Error when loading", mainfile, plugin_module)
-            end
-            if ok and plugin_module and not plugin_module.disabled then
+            elseif type(plugin_module.disabled) ~= "boolean" or not plugin_module.disabled then
                 package.path = package_path
                 package.cpath = package_cpath
                 plugin_module.path = path
                 plugin_module.name = plugin_module.name or path:match("/(.-)%.koplugin")
                 table.insert(self.plugins, plugin_module)
+            else
+                logger.info("Plugin ", mainfile, " has been disabled.")
             end
         end
     end
diff --git a/frontend/ui/uimanager.lua b/frontend/ui/uimanager.lua
index 0138f98bc..889f09be6 100644
--- a/frontend/ui/uimanager.lua
+++ b/frontend/ui/uimanager.lua
@@ -60,11 +60,12 @@ function UIManager:init()
         self:_initAutoSuspend()
         self.event_handlers["Suspend"] = function()
             self:_stopAutoSuspend()
+            self:broadcastEvent(Event:new("Suspend"))
             Device:onPowerEvent("Suspend")
         end
         self.event_handlers["Resume"] = function()
             Device:onPowerEvent("Resume")
-            self:sendEvent(Event:new("Resume"))
+            self:broadcastEvent(Event:new("Resume"))
             self:_startAutoSuspend()
         end
         self.event_handlers["PowerPress"] = function()
@@ -99,11 +100,17 @@ function UIManager:init()
             Device:getPowerDevice():toggleFrontlight()
         end
         self.event_handlers["Charging"] = function()
+            self:broadcastEvent(Event:new("Charging"))
+            if Device.screen_saver_mode then
+                self.event_handlers["Suspend"]()
+            end
+        end
+        self.event_handlers["NotCharging"] = function()
+            self:broadcastEvent(Event:new("NotCharging"))
             if Device.screen_saver_mode then
                 self.event_handlers["Suspend"]()
             end
         end
-        self.event_handlers["NotCharging"] = self.event_handlers["Charging"]
         self.event_handlers["__default__"] = function(input_event)
             if Device.screen_saver_mode then
                 -- Suspension in Kobo can be interrupted by screen updates. We
@@ -116,18 +123,20 @@ function UIManager:init()
         end
     elseif Device:isKindle() then
         self.event_handlers["IntoSS"] = function()
+            self:broadcastEvent(Event:new("Suspend"))
             Device:intoScreenSaver()
         end
         self.event_handlers["OutOfSS"] = function()
             Device:outofScreenSaver()
-            self:sendEvent(Event:new("Resume"))
+            self:broadcastEvent(Event:new("Resume"))
         end
         self.event_handlers["Charging"] = function()
+            self:broadcastEvent(Event:new("Charging"))
             Device:usbPlugIn()
         end
         self.event_handlers["NotCharging"] = function()
             Device:usbPlugOut()
-            self:sendEvent(Event:new("NotCharging"))
+            self:broadcastEvent(Event:new("NotCharging"))
         end
     end
 end
@@ -728,7 +737,7 @@ function UIManager:_initAutoSuspend()
             local now = util.gettime()
             -- Do not repeat auto suspend procedure after suspend.
             if self.last_action_sec + self.auto_suspend_sec <= now then
-                Device:onPowerEvent("Suspend")
+                self.event_handlers["Suspend"]()
             else
                 self:scheduleIn(
                     self.last_action_sec + self.auto_suspend_sec - now,
diff --git a/plugins/batterystat.koplugin/main.lua b/plugins/batterystat.koplugin/main.lua
new file mode 100644
index 000000000..d8217835a
--- /dev/null
+++ b/plugins/batterystat.koplugin/main.lua
@@ -0,0 +1,283 @@
+
+local DataStorage = require("datastorage")
+local KeyValuePage = require("ui/widget/keyvaluepage")
+local LuaSettings = require("luasettings")
+local PowerD = require("device"):getPowerDevice()
+local UIManager = require("ui/uimanager")
+local WidgetContainer = require("ui/widget/container/widgetcontainer")
+local T = require("ffi/util").template
+local logger = require("logger")
+local util = require("ffi/util")
+local _ = require("gettext")
+
+local State = {}
+
+function State:new(o)
+    o = o or {}
+    setmetatable(o, self)
+    self.__index = self
+    if o.percentage == nil or o.timestamp == nil then
+        o.percentage = PowerD:getCapacity()
+        o.timestamp = os.time()
+    end
+    return o
+end
+
+function State:toString()
+    return string.format("{%d @ %s}", self.percentage, os.date("%c", self.timestamp))
+end
+
+local Usage = {}
+
+function Usage:new(o)
+    o = o or {}
+    setmetatable(o, self)
+    self.__index = self
+    if o.percentage == nil or o.time == nil then
+        o.percentage = 0
+        o.time = 0
+    end
+    return o
+end
+
+function Usage:append(state)
+    local curr = State:new()
+    self.percentage = self.percentage + (state.percentage - curr.percentage)
+    self.time = self.time + os.difftime(curr.timestamp - state.timestamp)
+end
+
+function Usage:minutes()
+    return self.time / 60
+end
+
+function Usage:hours()
+    return self:minutes() / 60
+end
+
+function Usage:percentagePerHour()
+    if self.time == 0 then
+        return 0
+    else
+        return self.percentage / self:hours()
+    end
+end
+
+function Usage:remainingHours()
+    local curr = State:new()
+    return curr.percentage / self:percentagePerHour()
+end
+
+function Usage:chargingHours()
+    local curr = State:new()
+    return (curr.percentage - 100) / self:percentagePerHour()
+end
+
+local function shorten(number)
+    return string.format("%.2f", number);
+end
+
+function Usage:dump(kv_pairs)
+    table.insert(kv_pairs, {_("    Consumed %"), shorten(self.percentage)})
+    table.insert(kv_pairs, {_("    Total minutes"), shorten(self:minutes())})
+    table.insert(kv_pairs, {_("    % per hour"), shorten(self:percentagePerHour())})
+end
+
+function Usage:dumpRemaining(kv_pairs)
+    table.insert(kv_pairs, {_("    Estimated remaining hours"), shorten(self:remainingHours())})
+end
+
+function Usage:dumpCharging(kv_pairs)
+    table.insert(kv_pairs, {_("    Estimated hours for charging"), shorten(self:chargingHours())})
+end
+
+local BatteryStat = {
+    name = "batterstat",
+    settings = LuaSettings:open(DataStorage:getSettingsDir() .. "/batterstat.lua"),
+    dump_file = util.realpath(DataStorage:getDataDir()) .. "/batterystat.log",
+    debugging = false,
+}
+
+function BatteryStat:init()
+    self.charging = Usage:new(self.settings:readSetting("charging"))
+    self.decharging = Usage:new(self.settings:readSetting("decharging"))
+    self.awake = Usage:new(self.settings:readSetting("awake"))
+    self.sleeping = Usage:new(self.settings:readSetting("sleeping"))
+
+    -- Note: these fields are not the "real" timestamp and battery usage, but
+    -- the unaccumulated values.
+    self.charging_state = State:new(self.settings:readSetting("charging_state"))
+    self.awake_state = State:new(self.settings:readSetting("awake_state"))
+    self:initCurrentState()
+
+    if self.debugging then
+        self.debugOutput = self._debugOutput
+    else
+        self.debugOutput = function() end
+    end
+end
+
+function BatteryStat:initCurrentState()
+    -- Whether the device was suspending before current timestamp.
+    self.was_suspending = false
+    -- Whether the device was charging before current timestamp.
+    self.was_charging = PowerD:isCharging()
+end
+
+function BatteryStat:onFlushSettings()
+    self.settings:reset({
+        charging = self.charging,
+        decharging = self.decharging,
+        awake = self.awake,
+        sleeping = self.sleeping,
+        charging_state = self.charging_state,
+        awake_state = self.awake_state,
+    })
+    self.settings:flush()
+end
+
+function BatteryStat:accumulate()
+    if self.was_suspending then
+        -- Suspending to awake.
+        self.sleeping:append(self.awake_state)
+    else
+        -- Awake to suspending, time between self.awake_state and now should belong to awake.
+        self.awake:append(self.awake_state)
+    end
+    if self.was_charging then
+        -- Decharging to charging.
+        self.charging:append(self.charging_state)
+    else
+        self.decharging:append(self.charging_state)
+    end
+    self.awake_state = State:new()
+    self.charging_state = State:new()
+end
+
+function BatteryStat:dumpOrLog(content)
+    local file = io.open(self.dump_file, "a")
+    if file then
+        file:write(content .. "\n")
+        file:close()
+    else
+        logger.warn("Failed to dump output ", content, " into ", self.dump_file )
+    end
+end
+
+function BatteryStat:_debugOutput(event)
+    self:dumpOrLog(event .. " @ " .. State:new():toString() ..
+                   ", awake_state " .. self.awake_state:toString() ..
+                   ", charging_state " .. self.charging_state:toString())
+end
+
+function BatteryStat:onSuspend()
+    self:debugOutput("onSuspend")
+    self.was_suspending = false
+    self:accumulate()
+end
+
+function BatteryStat:onResume()
+    self:debugOutput("onResume")
+    self.was_suspending = true
+    self:accumulate()
+end
+
+function BatteryStat:onCharging()
+    self:debugOutput("onCharging")
+    self.was_charging = false
+    self:dumpToText()
+    self.charging = Usage:new()
+    self.awake = Usage:new()
+    self.sleeping = Usage:new()
+    self:accumulate()
+end
+
+function BatteryStat:onNotCharging()
+    self:debugOutput("onNotCharging")
+    self.was_charging = true
+    self:dumpToText()
+    self.decharging = Usage:new()
+    self.awake = Usage:new()
+    self.sleeping = Usage:new()
+    self:accumulate()
+end
+
+function BatteryStat:onCallback()
+    self:initCurrentState()
+    self:accumulate()
+    local kv_pairs = self:dump()
+    table.insert(kv_pairs, "----------")
+    table.insert(kv_pairs, {_("Historical records are dumped to"), ""})
+    table.insert(kv_pairs, {self.dump_file, ""})
+    UIManager:show(KeyValuePage:new{
+        title = _("Battery statistics"),
+        kv_pairs = kv_pairs,
+    })
+end
+
+function BatteryStat:dumpToText()
+    local kv_pairs = self:dump()
+    local content = T(_("Dump at %1"), os.date("%c"))
+    for _, pair in ipairs(kv_pairs) do
+        content = content .. "\n" .. pair[1]
+        if pair[2] ~= nil and pair[2] ~= "" then
+            content = content .. "\t" .. pair[2]
+        end
+    end
+    self:dumpOrLog(content .. "\n-=-=-=-=-=-\n")
+end
+
+function BatteryStat:dump()
+    local kv_pairs = {}
+    table.insert(kv_pairs, {_("Awake since last charge"), ""})
+    self.awake:dump(kv_pairs)
+    self.awake:dumpRemaining(kv_pairs)
+    table.insert(kv_pairs, {_("Sleeping since last charge"), ""})
+    self.sleeping:dump(kv_pairs)
+    self.sleeping:dumpRemaining(kv_pairs)
+    table.insert(kv_pairs, {_("During last charge"), ""})
+    self.charging:dump(kv_pairs)
+    self.charging:dumpCharging(kv_pairs)
+    table.insert(kv_pairs, {_("Since last charge"), ""})
+    self.decharging:dump(kv_pairs)
+    self.decharging:dumpRemaining(kv_pairs)
+    return kv_pairs
+end
+
+BatteryStat:init()
+
+local BatteryStatWidget = WidgetContainer:new()
+
+function BatteryStatWidget:init()
+    self.ui.menu:registerToMainMenu(self)
+end
+
+function BatteryStatWidget:addToMainMenu(tab_item_table)
+    table.insert(tab_item_table.plugins, {
+        text = _("Battery statistics"),
+        callback = function()
+            BatteryStat:onCallback()
+        end,
+    })
+end
+
+function BatteryStatWidget:onFlushSettings()
+    BatteryStat:onFlushSettings()
+end
+
+function BatteryStatWidget:onSuspend()
+    BatteryStat:onSuspend()
+end
+
+function BatteryStatWidget:onResume()
+    BatteryStat:onResume()
+end
+
+function BatteryStatWidget:onCharging()
+    BatteryStat:onCharging()
+end
+
+function BatteryStatWidget:onNotCharging()
+    BatteryStat:onNotCharging()
+end
+
+return BatteryStatWidget
diff --git a/plugins/kobolight.koplugin/demo.png b/plugins/kobolight.koplugin/demo.png
new file mode 100644
index 000000000..61b76f38f
Binary files /dev/null and b/plugins/kobolight.koplugin/demo.png differ
diff --git a/plugins/kobolight.koplugin/main.lua b/plugins/kobolight.koplugin/main.lua
index e8a10cd45..0b5284674 100644
--- a/plugins/kobolight.koplugin/main.lua
+++ b/plugins/kobolight.koplugin/main.lua
@@ -1,20 +1,24 @@
 local Device = require("device")
 
-if not ((Device:isKindle() or Device:isKobo()) and Device:hasFrontlight()) then
+local with_frontlight = (Device:isKindle() or Device:isKobo()) and Device:hasFrontlight()
+if not (with_frontlight or Device:isSDL()) then
     return { disabled = true, }
 end
 
-local WidgetContainer = require("ui/widget/container/widgetcontainer")
-local Screen = Device.screen
-local UIManager = require("ui/uimanager")
+local ConfirmBox = require("ui/widget/confirmbox")
+local ImageWidget = require("ui/widget/imagewidget")
+local InfoMessage = require("ui/widget/infomessage")
 local Notification = require("ui/widget/notification")
+local PluginLoader = require("pluginloader")
+local Screen = require("device").screen
+local UIManager = require("ui/uimanager")
+local WidgetContainer = require("ui/widget/container/widgetcontainer")
 local T = require("ffi/util").template
 local _ = require("gettext")
 
 local tap_touch_zone_ratio = { x = 0, y = 15/16, w = 1/10, h = 1/16, }
 local swipe_touch_zone_ratio = { x = 0, y = 1/8, w = 1/10, h = 7/8, }
 
-
 local KoboLight = WidgetContainer:new{
     name = 'kobolight',
     gestureScale = nil,  -- initialized in self:resetLayout()
@@ -28,6 +32,8 @@ function KoboLight:init()
     do
         self.steps[i] = math.ceil(self.steps[i] * scale)
     end
+
+    self.ui.menu:registerToMainMenu(self)
 end
 
 function KoboLight:onReaderReady()
@@ -35,8 +41,13 @@ function KoboLight:onReaderReady()
     self:resetLayout()
 end
 
+function KoboLight:disabled()
+    return G_reader_settings:isTrue("disable_kobolight")
+end
+
 function KoboLight:setupTouchZones()
     if not Device:isTouchDevice() then return end
+    if self:disabled() then return end
     local swipe_zone = {
         ratio_x = swipe_touch_zone_ratio.x, ratio_y = swipe_touch_zone_ratio.y,
         ratio_w = swipe_touch_zone_ratio.w, ratio_h = swipe_touch_zone_ratio.h,
@@ -148,4 +159,39 @@ function KoboLight:onSwipe(_, ges)
     return true
 end
 
+function KoboLight:addToMainMenu(tab_item_table)
+    table.insert(tab_item_table.plugins, {
+        text = _("Frontlight gesture controller"),
+        callback = function()
+            local image = ImageWidget:new{
+                file = PluginLoader.plugin_path .. "/kobolight.koplugin/demo.png",
+                height = Screen:getHeight(),
+                width = Screen:getWidth(),
+                scale_factor = 0,
+            }
+            UIManager:show(image)
+            UIManager:show(ConfirmBox:new{
+                text = T(_("Frontlight gesture controller can:\n- Turn on or off frontlight by tapping bottom left of the screen.\n- Change frontlight intensity by swiping up or down on the left of the screen.\n\nDo you want to %1 it?"),
+                         self:disabled() and _("enable") or _("disable")),
+                ok_text = self:disabled() and _("Enable") or _("Disable"),
+                ok_callback = function()
+                    UIManager:close(image)
+                    UIManager:setDirty("all", "full")
+                    UIManager:show(InfoMessage:new{
+                        text = T(_("You have %1 the frontlight gesture controller. It will take effect on next restart."),
+                                 self:disabled() and _("enabled") or _("disabled"))
+                    })
+                    G_reader_settings:flipTrue("disable_kobolight")
+                end,
+                cancel_text = _("Close"),
+                cancel_callback = function()
+                    UIManager:close(image)
+                    UIManager:setDirty("all", "full")
+                end,
+            })
+            UIManager:setDirty("all", "full")
+        end,
+    })
+end
+
 return KoboLight