fix: add screen.lua

forgot to add it in previous commit :(

screen.lua

@@ -0,0 +1,74 @@
+--[[
+    Copyright (C) 2011 Hans-Werner Hilse <hilse@web.de>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+]]--
+
+--[[
+Codes for rotation modes:
+
+1 for no rotation, 
+2 for landscape with bottom on the right side of screen, etc.
+
+		  3
+   +--------------+
+   | +----------+ |
+   | |          | |
+   | | Freedom! | |
+   | |          | |  
+   | |          | |  
+ 4 | |          | | 2
+   | |          | |
+   | |          | |
+   | +----------+ |
+   |              |
+   |              |
+   +--------------+
+		  1
+--]]
+
+
+Screen = {
+	rotation_modes = {"Up","Right","Down","Left"},
+	cur_rotation_mode = 1,
+}
+
+-- @ orien: 1 for clockwise rotate, -1 for anti-clockwise
+function Screen:screenRotate(orien)
+	if orien == "clockwise" then
+		orien = 1
+	elseif orien == "anticlockwise" then
+		orien = -1
+	else
+		return
+	end
+
+	fb:close()
+	self.cur_rotation_mode = (self.cur_rotation_mode-1 + 1*orien)%4 + 1
+	local mode = self.rotation_modes[self.cur_rotation_mode]
+	os.execute("lipc-send-event -r 3 com.lab126.hal orientation"..mode)
+	fb = einkfb.open("/dev/fb0")
+end
+
+function Screen:updateRotationMode()
+	if KEY_FW_DOWN == 116 then -- in EMU mode always set to 1
+		self.cur_rotation_mode = 1
+	else
+		orie_fd = assert(io.open("/sys/module/eink_fb_hal_broads/parameters/bs_orientation", "r"))
+		updown_fd = assert(io.open("/sys/module/eink_fb_hal_broads/parameters/bs_upside_down", "r"))
+		self.cur_rotation_mode = orie_fd:read() + (updown_fd:read() * 2) + 1
+	end
+end
+
+