Don't fake the swipe to unlock if not needed.

Re: #695

frontend/ui/device.lua

@@ -11,6 +11,7 @@ local Device = {
     screen_saver_mode = false,
     charging_mode = false,
     survive_screen_saver = false,
+    is_special_offers = nil,
     touch_dev = nil,
     model = nil,
     firmware_rev = nil,
@@ -265,4 +266,26 @@ function Device:getPowerDevice()
     return self.powerd
 end
 
+function Device:isSpecialOffers()
+    if self.is_special_offers ~= nil then return self.is_special_offers end
+    -- K5 only
+    if self:isTouchDevice() and self:isKindle() then
+        -- Look at the current blanket modules to see if the SO screensavers are enabled...
+        local lipc = require("liblipclua")
+        local lipc_handle = nil
+        if lipc then
+            lipc_handle = lipc.init("com.github.koreader.device")
+        end
+        if lipc_handle then
+            local loaded_blanket_modules = lipc_handle:get_string_property("com.lab126.blanket", "load")
+            if string.find(loaded_blanket_modules, "ad_screensaver") then
+                self.is_special_offers = true
+            end
+            lipc_handle:close()
+        else
+        end
+    end
+    return self.is_special_offers
+end
+
 return Device

reader.lua

@@ -48,14 +48,16 @@ function exitReader()
             os.execute("echo 'send 139' > /proc/keypad;echo 'send 139' > /proc/keypad")
         end
         if Device:isTouchDevice() and Device.survive_screen_saver then
-            -- hack the swipe to unlock screen
-            local dev = Device:getTouchInputDev()
-            if dev then
-                local width, height = Screen:getWidth(), Screen:getHeight()
-                input.fakeTapInput(dev,
-                    math.min(width, height)/2,
-                    math.max(width, height)-30
-                )
+            -- If needed, hack the swipe to unlock screen
+            if Device:isSpecialOffers() then
+                local dev = Device:getTouchInputDev()
+                if dev then
+                    local width, height = Screen:getWidth(), Screen:getHeight()
+                    input.fakeTapInput(dev,
+                        math.min(width, height)/2,
+                        math.max(width, height)-30
+                    )
+                end
             end
         end
     end