Kindle: Attempt to deal with sticky "waking up" hibernation banners (#9491)

Fix #9482

frontend/device/kindle/device.lua

@@ -1,5 +1,6 @@
 local Generic = require("device/generic/device")
 local time = require("ui/time")
+local lfs = require("libs/libkoreader-lfs")
 local logger = require("logger")
 
 local function yes() return true end
@@ -113,7 +114,6 @@ end
 Test if a kindle device has *received* Special Offers (FW < 5.x)
 --]]
 local function hasSpecialOffers()
-    local lfs = require("libs/libkoreader-lfs")
     if lfs.attributes("/mnt/us/system/.assets", "mode") == "directory" then
         return true
     else
@@ -204,10 +204,40 @@ function Kindle:supportsScreensaver()
     end
 end
 
+function Kindle:init()
+    -- Check if the device supports deep sleep/quick boot
+    if lfs.attributes("/sys/devices/platform/falconblk/uevent", "mode") == "file" then
+        -- Now, poke the appreg db to see if it's actually *enabled*...
+        -- NOTE: The setting is only available on registered devices, as such, it *can* be missing,
+        --       which is why we check for it existing and being *disabled*, as that ensures user interaction.
+        local SQ3 = require("lua-ljsqlite3/init")
+        local appreg = SQ3.open("/var/local/appreg.db", "ro")
+        local hibernation_disabled = tonumber(appreg:rowexec(
+            "SELECT EXISTS(SELECT value FROM properties WHERE handlerId = 'dcc' AND name = 'hibernate.enabled' AND value = 0);"
+        ))
+        -- Check the actual delay while we're there...
+        local hibernation_delay =
+            appreg:rowexec("SELECT value FROM properties WHERE handlerId = 'dcc' AND name = 'hibernate.s2h.rtc.secs'") or
+            appreg:rowexec("SELECT value FROM properties WHERE handlerId = 'dcd' AND name = 'hibernate.s2h.rtc.secs'") or
+            3600
+        appreg:close()
+        if hibernation_disabled == 1 then
+            self.canDeepSleep = false
+        else
+            self.canDeepSleep = true
+            self.hibernationDelay = tonumber(hibernation_delay)
+            logger.dbg("Kindle: Device supports hibernation, enters hibernation after", self.hibernationDelay, "seconds in suspend")
+        end
+    else
+        self.canDeepSleep = false
+    end
+
+    Generic.init(self)
+end
+
 function Kindle:setDateTime(year, month, day, hour, min, sec)
     if hour == nil or min == nil then return true end
 
-    local lfs = require("libs/libkoreader-lfs")
     -- Prefer using the setdate wrapper if possible, as it will poke the native UI, too.
     if lfs.attributes("/usr/sbin/setdate", "mode") == "file" then
         local t = os.date("*t") -- Start with now to make sure we have a full table
@@ -274,11 +304,37 @@ function Kindle:outofScreenSaver()
         if self:supportsScreensaver() then
             local Screensaver = require("ui/screensaver")
             local widget_was_closed = Screensaver:close()
+            local UIManager = require("ui/uimanager")
             if widget_was_closed then
                 -- And redraw everything in case the framework managed to screw us over...
-                local UIManager = require("ui/uimanager")
                 UIManager:nextTick(function() UIManager:setDirty("all", "full") end)
             end
+
+            -- If the device supports deep sleep, and we woke up from hibernation (which kicks in at the 1H mark),
+            -- chuck an extra tiny refresh to get rid of the "waking up" banner if the above refresh was too early...
+            if self.canDeepSleep and self.last_suspend_time > time.s(self.hibernationDelay) then
+                if lfs.attributes("/var/local/system/powerd/hibernate_session_tracker", "mode") == "file" then
+                    local mtime = lfs.attributes("/var/local/system/powerd/hibernate_session_tracker", "modification")
+                    local now = os.time()
+                    if math.abs(now - mtime) <= 60 then
+                        -- That was less than a minute ago, assume we're golden.
+                        logger.dbg("Kindle: Woke up from hibernation")
+                        -- The banner on a 1236x1648 PW5 is 1235x125; we refresh the bottom 10% of the screen to be safe.
+                        local Geom = require("ui/geometry")
+                        local screen_height = self.screen:getHeight()
+                        local refresh_height = math.ceil(screen_height / 10)
+                        local refresh_region = Geom:new{
+                            x = 0,
+                            y = screen_height - 1 - refresh_height,
+                            w = self.screen:getWidth(),
+                            h = refresh_height
+                        }
+                        UIManager:scheduleIn(1.5, function()
+                            UIManager:setDirty("all", "ui", refresh_region)
+                        end)
+                    end
+                end
+            end
         else
             -- Stop awesome again if need be...
             if os.getenv("AWESOME_STOPPED") == "yes" then
@@ -583,11 +639,6 @@ function Kindle4:init()
     Kindle.init(self)
 end
 
--- luacheck: push
--- luacheck: ignore
-local ABS_MT_POSITION_X = 53
-local ABS_MT_POSITION_Y = 54
--- luacheck: pop
 function KindleTouch:init()
     self.screen = require("ffi/framebuffer_mxcfb"):new{device = self, debug = logger.dbg}
     self.powerd = require("device/kindle/powerd"):new{
@@ -1082,7 +1133,7 @@ local kindle_sn = kindle_sn_fd:read("*line")
 kindle_sn_fd:close()
 -- NOTE: Attempt to sanely differentiate v1 from v2,
 --       c.f., https://github.com/NiLuJe/FBInk/commit/8a1161734b3f5b4461247af461d26987f6f1632e
-local kindle_sn_lead = string.sub(kindle_sn,1,1)
+local kindle_sn_lead = string.sub(kindle_sn, 1, 1)
 
 -- NOTE: Update me when new devices come out :)
 --       c.f., https://wiki.mobileread.com/wiki/Kindle_Serial_Numbers for identified variants
@@ -1157,5 +1208,5 @@ else
     end
 end
 
-local kindle_sn_prefix = string.sub(kindle_sn,1,6)
-error("unknown Kindle model: "..kindle_sn_prefix)
+local kindle_sn_prefix = string.sub(kindle_sn, 1, 6)
+error("unknown Kindle model: " .. kindle_sn_prefix)