rewrite device detection

frontend/ui/device.lua

@@ -3,6 +3,35 @@ Device = {
 	charging_mode = false,
 }
 
+function Device:getModel()
+	local std_out = io.popen("grep 'MX' /proc/cpuinfo | cut -d':' -f2 | awk {'print $2'}", "r")
+	local cpu_mod = std_out:read()	
+	if not cpu_mod then
+		return nil
+	end
+
+	if cpu_mod == "MX50" then
+		local f = lfs.attributes("/sys/devices/system/fl_tps6116x/fl_tps6116x0/fl_intensity")
+		if f then
+			return "KindlePaperWhite"
+		else
+			return "Kindle4"
+		end
+	elseif cpu_mod == "MX35" then
+		-- check if we are running on Kindle 3 (additional volume input)
+		local f = lfs.attributes("/dev/input/event2")
+		if f then
+			return "Kindle3"
+		else
+			return "KindleDXG"
+		end
+	elseif cpu_mod == "MX3" then
+		return "Kindle2"
+	else
+		return nil
+	end
+end
+
 function Device:isKindle4()
 	re_val = os.execute("cat /proc/cpuinfo | grep MX50")
 	if re_val == 0 then

frontend/ui/inputevent.lua

@@ -230,21 +230,27 @@ function Input:init()
 		self.event_map = self.sdl_event_map
 	else
 		input.open("fake_events")
-		input.open("/dev/input/event0")
-		input.open("/dev/input/event1")
-
-		-- check if we are running on Kindle 3 (additional volume input)
-		local f=lfs.attributes("/dev/input/event2")
-		if f then
-			input.open("/dev/input/event2")
-			if Device:isKindle3() then
-				print("Auto-detected Kindle 3")
-			end
-		end
+		local dev_mod = Device:getModel()
 
-		if Device:isKindle4() then
+		input.open("/dev/input/event0")
+		if dev_mod ~= "KindlePaperWhite" then
+			-- we don't have event1 in KindlePaperWhite
+			input.open("/dev/input/event1")
+		elseif dev_mod == "KindlePaperWhite" then
+			print("Auto-detected Kindle PaperWhite")
+		elseif dev_mod == "Kindle4" then
 			print("Auto-detected Kindle 4")
 			self:adjustKindle4EventMap()
+		elseif dev_mod == "Kindle3" then
+			input.open("/dev/input/event2")
+			print("Auto-detected Kindle 3")
+		elseif dev_mod == "KindleDXG" then
+			print("Auto-detected Kindle DXG")
+		elseif dev_mod == "Kindle2" then
+			print("Auto-detected Kindle 2")
+		else
+			print("Not supported device model!")
+			os.exit(-1)
 		end
 	end
 end