Kindle: Log the suspend/wakeup source

We currently don't do anything with it, but this might help someone come
up with fancier smartcover handling, like we do on Kobo...

Simplify the fake events w/args checks:
We can just hitcheck the table directly, no need for another hash

Also catch ExitedSS on Kindle.
And, again, dn't do anything with it ;p.

frontend/device/input.lua

@@ -145,17 +145,13 @@ local Input = {
     },
 
     fake_event_set = {
-        IntoSS = true, OutOfSS = true,
+        IntoSS = true, OutOfSS = true, ExitingSS = true,
         UsbPlugIn = true, UsbPlugOut = true,
         Charging = true, NotCharging = true,
         WakeupFromSuspend = true, ReadyToSuspend = true,
         UsbDevicePlugIn = true, UsbDevicePlugOut = true,
     },
-    -- Subset of fake_event_set for events that require passing a parameter along
-    complex_fake_event_set = {
-        UsbDevicePlugIn = true, UsbDevicePlugOut = true,
-    },
-    -- Crappy FIFO to forward parameters for those events to UIManager
+    -- Crappy FIFO to forward parameters to UIManager for the subset of fake_event_set that require passing a parameter along
     fake_event_args = {
         UsbDevicePlugIn = {},
         UsbDevicePlugOut = {},
@@ -246,8 +242,9 @@ function Input:init()
     end
 
     -- set up fake event map
-    self.event_map[10000] = "IntoSS" -- go into screen saver
-    self.event_map[10001] = "OutOfSS" -- go out of screen saver
+    self.event_map[10000] = "IntoSS" -- Requested to go into screen saver
+    self.event_map[10001] = "OutOfSS" -- Requested to go out of screen saver
+    self.event_map[10002] = "ExitingSS" -- Specific to Kindle, SS *actually* closed
     self.event_map[10010] = "UsbPlugIn"
     self.event_map[10011] = "UsbPlugOut"
     self.event_map[10020] = "Charging"
@@ -618,7 +615,7 @@ function Input:handleKeyBoardEv(ev)
         -- So, we simply store it somewhere our handler can find and call it a day.
         -- And we use an array as a FIFO because we cannot guarantee that insertions and removals will interleave nicely.
         -- (This is all in the name of avoiding complexifying the common codepaths for events that should be few and far between).
-        if self.complex_fake_event_set[keycode] then
+        if self.fake_event_args[keycode] then
             table.insert(self.fake_event_args[keycode], ev.value)
         end
         return keycode
@@ -708,6 +705,9 @@ function Input:handlePowerManagementOnlyEv(ev)
     end
 
     if self.fake_event_set[keycode] then
+        if self.fake_event_args[keycode] then
+            table.insert(self.fake_event_args[keycode], ev.value)
+        end
         return keycode
     end
 

frontend/device/kindle/device.lua

@@ -280,7 +280,18 @@ function Kindle:usbPlugIn()
     -- NOTE: If the device is put in USBNet mode before we even start, everything's peachy, though :).
 end
 
-function Kindle:intoScreenSaver()
+-- Hopefully, the event sources are fairly portable...
+-- c.f., https://github.com/koreader/koreader/pull/11174#issuecomment-1830064445
+-- NOTE: There's no distinction between real button presses and powerd_test -p or lipc-set-prop -i com.lab126.powerd powerButton 1
+local POWERD_EVENT_SOURCES = {
+    [1] = "BUTTON_WAKEUP",  -- outOfScreenSaver 1
+    [2] = "BUTTON_SUSPEND", -- goingToScreenSaver 2
+    [4] = "HALL_SUSPEND",   -- goingToScreenSaver 4
+    [6] = "HALL_WAKEUP",    -- outOfScreenSaver 6
+}
+
+function Kindle:intoScreenSaver(source)
+    logger.dbg("Kindle:intoScreenSaver via", POWERD_EVENT_SOURCES[source] or string.format("UNKNOWN_SUSPEND (%d)", source or -1))
     if not self.screen_saver_mode then
         if self:supportsScreensaver() then
             -- NOTE: Meaning this is not a SO device ;)
@@ -304,7 +315,8 @@ function Kindle:intoScreenSaver()
     self.powerd:beforeSuspend()
 end
 
-function Kindle:outofScreenSaver()
+function Kindle:outofScreenSaver(source)
+    logger.dbg("Kindle:outofScreenSaver via", POWERD_EVENT_SOURCES[source] or string.format("UNKNOWN_WAKEUP (%d)", source or -1))
     if self.screen_saver_mode then
         if self:supportsScreensaver() then
             local Screensaver = require("ui/screensaver")
@@ -357,6 +369,9 @@ function Kindle:outofScreenSaver()
     self.powerd:afterResume()
 end
 
+-- On stock, there's a distinction between OutOfSS (which *requests* closing the SS) and ExitingSS, which fires once they're *actually* closed...
+function Kindle:exitingScreenSaver() end
+
 function Kindle:usbPlugOut()
     -- NOTE: See usbPlugIn(), we don't have anything fancy to do here either.
 end
@@ -382,14 +397,24 @@ function Kindle:UIManagerReady(uimgr)
 end
 
 function Kindle:setEventHandlers(uimgr)
+    -- These custom fake events *will* pass an argument...
+    self.input.fake_event_args.IntoSS = {}
+    self.input.fake_event_args.OutOfSS = {}
+
     UIManager.event_handlers.Suspend = function()
         self.powerd:toggleSuspend()
     end
-    UIManager.event_handlers.IntoSS = function()
-        self:intoScreenSaver()
+    UIManager.event_handlers.IntoSS = function(input_event)
+        -- Retrieve the argument set by Input:handleKeyBoardEv
+        local arg = table.remove(self.input.fake_event_args[input_event])
+        self:intoScreenSaver(arg)
     end
-    UIManager.event_handlers.OutOfSS = function()
-        self:outofScreenSaver()
+    UIManager.event_handlers.OutOfSS = function(input_event)
+        local arg = table.remove(self.input.fake_event_args[input_event])
+        self:outofScreenSaver(arg)
+    end
+    UIManager.event_handlers.ExitingSS = function()
+        self:exitingScreenSaver()
     end
     UIManager.event_handlers.Charging = function()
         self:_beforeCharging()