WakeupMgr: Minor usage tweak (#7400)

* Unify logging with AutoSuspend (e.g., keep ourselves to showing the delay in seconds, not the raw timestamp, as that's way harder to interpret, and the RTC module and/or logger will do that for us when the time comes).
* Speaking of, minor revamp of RTC related logging to make it more human-readable.
* On Kobo, if we hit the unexpected wakeup limit, re-engage AutoSuspend's *suspend* check, so that the device has a chance to poweroff instead of being kept awake.

frontend/device/kobo/device.lua

@@ -540,6 +540,7 @@ local function check_unexpected_wakeup()
     -- just in case other events like SleepCoverClosed also scheduled a suspend
     UIManager:unschedule(Kobo.suspend)
 
+    -- Do an initial validation to discriminate unscheduled wakeups happening *outside* of the alarm proximity window.
     if WakeupMgr:isWakeupAlarmScheduled() and WakeupMgr:validateWakeupAlarmByProximity() then
         logger.info("Kobo suspend: scheduled wakeup.")
         local res = WakeupMgr:wakeupAction()
@@ -557,6 +558,9 @@ local function check_unexpected_wakeup()
             -- Don't put device back to sleep under the following two cases:
             --   1. a resume event triggered Kobo:resume() function
             --   2. trying to put device back to sleep more than 20 times after unexpected wakeup
+            -- Broadcast a specific event, so that AutoSuspend can pick up the baton...
+            local Event = require("ui/event")
+            UIManager:broadcastEvent(Event:new("UnexpectedWakeupLimit"))
             return
         end
 

frontend/device/wakeupmgr.lua

@@ -55,7 +55,7 @@ function WakeupMgr:addTask(seconds_from_now, callback)
     if not type(seconds_from_now) == "number" and not type(callback) == "function" then return end
 
     local epoch = RTC:secondsFromNowToEpoch(seconds_from_now)
-    logger.info("WakeupMgr: scheduling wakeup for:", seconds_from_now, epoch)
+    logger.info("WakeupMgr: scheduling wakeup in", seconds_from_now)
 
     local old_upcoming_task = (self._task_queue[1] or {}).epoch
 
@@ -181,7 +181,13 @@ Simple wrapper for @{ffi.rtc.isWakeupAlarmScheduled}.
 --]]
 function WakeupMgr:isWakeupAlarmScheduled()
     local wakeup_scheduled = RTC:isWakeupAlarmScheduled()
-    logger.dbg("isWakeupAlarmScheduled", wakeup_scheduled)
+    if wakeup_scheduled then
+        -- NOTE: This can't return nil given that we're behind an isWakeupAlarmScheduled check.
+        local alarm = RTC:getWakeupAlarmEpoch()
+        logger.dbg("WakeupMgr:isWakeupAlarmScheduled: An alarm is scheduled for " .. alarm .. os.date(" (%F %T %z)", alarm))
+    else
+        logger.dbg("WakeupMgr:isWakeupAlarmScheduled: No alarm is currently scheduled.")
+    end
     return wakeup_scheduled
 end
 

plugins/autosuspend.koplugin/main.lua

@@ -36,8 +36,8 @@ function AutoSuspend:_enabledShutdown()
     return Device:canPowerOff() and self.autoshutdown_timeout_seconds > 0
 end
 
-function AutoSuspend:_schedule()
-    if not self:_enabled() then
+function AutoSuspend:_schedule(shutdown_only)
+    if not self:_enabled() and (Device:canPowerOff() and not self:_enabledShutdown()) then
         logger.dbg("AutoSuspend:_schedule is disabled")
         return
     end
@@ -57,17 +57,17 @@ function AutoSuspend:_schedule()
     if delay_shutdown <= 0 then
         logger.dbg("AutoSuspend: initiating shutdown")
         UIManager:poweroff_action()
-    elseif delay_suspend <= 0 then
+    elseif delay_suspend <= 0 and not shutdown_only then
         logger.dbg("AutoSuspend: will suspend the device")
         UIManager:suspend()
     else
-        if self:_enabled() then
-            logger.dbg("AutoSuspend: schedule suspend in", delay_suspend)
-            UIManager:scheduleIn(delay_suspend, self._schedule, self)
+        if self:_enabled() and not shutdown_only then
+            logger.dbg("AutoSuspend: scheduling next suspend check in", delay_suspend)
+            UIManager:scheduleIn(delay_suspend, self._schedule, self, shutdown_only)
         end
         if self:_enabledShutdown() then
-            logger.dbg("AutoSuspend: schedule shutdown in", delay_shutdown)
-            UIManager:scheduleIn(delay_shutdown, self._schedule, self)
+            logger.dbg("AutoSuspend: scheduling next shutdown check in", delay_shutdown)
+            UIManager:scheduleIn(delay_shutdown, self._schedule, self, shutdown_only)
         end
     end
 end
@@ -86,6 +86,16 @@ function AutoSuspend:_start()
     end
 end
 
+-- Variant that only re-engages the shutdown timer for onUnexpectedWakeupLimit
+function AutoSuspend:_restart()
+    if self:_enabledShutdown() then
+        local now_ts = os.time()
+        logger.dbg("AutoSuspend: restart at", now_ts)
+        self.last_action_sec = now_ts
+        self:_schedule(true)
+    end
+end
+
 function AutoSuspend:init()
     if Device:isPocketBook() and not Device:canSuspend() then return end
     UIManager.event_hook:registerWidget("InputEvent", self)
@@ -116,9 +126,17 @@ function AutoSuspend:onResume()
     if self:_enabledShutdown() and Device.wakeup_mgr then
         Device.wakeup_mgr:removeTask(nil, nil, UIManager.poweroff_action)
     end
+    -- Unschedule in case we tripped onUnexpectedWakeupLimit first...
+    self:_unschedule()
     self:_start()
 end
 
+function AutoSuspend:onUnexpectedWakeupLimit()
+    logger.dbg("AutoSuspend: onUnexpectedWakeupLimit")
+    -- Only re-engage the *shutdown* schedule to avoid doing the same dance indefinitely.
+    self:_restart()
+end
+
 function AutoSuspend:onAllowStandby()
     self.standby_prevented = false
 end