UInput touch example for #3

examples/uinput-touch.py

@@ -0,0 +1,167 @@
+#!/usr/bin/env python
+
+import os
+import signal
+import sys
+import time
+
+from datetime import datetime
+from threading import Timer
+
+try:
+    from evdev import uinput, UInput, AbsInfo, ecodes as e
+except ImportError:
+    exit("This service requires the evdev module\nInstall with: sudo pip install evdev")
+
+try:
+    import RPi.GPIO as gpio
+except ImportError:
+    exit("This service requires the RPi.GPIO module\nInstall with: sudo pip install RPi.GPIO")
+
+try:
+    import smbus
+except ImportError:
+    exit("This service requires the smbus module\nInstall with: sudo apt-get install python-smbus")
+
+
+os.system("sudo modprobe uinput")
+
+rotate = False
+
+try:
+    config = open("/boot/config.txt").read().split("\n")
+    for option in config:
+        if option.startswith("display_rotate="):
+            key, value = option.split("=")
+            if value.strip() == "0":
+               rotate = True
+except IOError:
+    pass
+
+DAEMON = False
+
+CAPABILITIES = {
+    e.EV_ABS : (
+        (e.ABS_X, AbsInfo(value=0, min=0, max=480, fuzz=0, flat=0, resolution=1)),
+        (e.ABS_Y, AbsInfo(value=0, min=0, max=480, fuzz=0, flat=0, resolution=1)),
+        (e.ABS_MT_SLOT, AbsInfo(value=0, min=0, max=1, fuzz=0, flat=0, resolution=0)),
+        (e.ABS_MT_TRACKING_ID, AbsInfo(value=0, min=0, max=65535, fuzz=0, flat=0, resolution=0)),
+        (e.ABS_MT_POSITION_X, AbsInfo(value=0, min=0, max=480, fuzz=0, flat=0, resolution=0)),
+        (e.ABS_MT_POSITION_Y, AbsInfo(value=0, min=0, max=480, fuzz=0, flat=0, resolution=0)),
+    ),
+    e.EV_KEY : [
+        e.BTN_TOUCH, 
+    ]
+}
+
+PIDFILE = "/var/run/hyperpixel2r-touch.pid"
+LOGFILE = "/var/log/hyperpixel2r-touch.log"
+
+if DAEMON:
+    try:
+        pid = os.fork()
+        if pid > 0:
+            sys.exit(0)
+
+    except OSError as e:
+        print("Fork #1 failed: {} ({})".format(e.errno, e.strerror))
+        sys.exit(1)
+
+    os.chdir("/")
+    os.setsid()
+    os.umask(0)
+
+    try:
+        pid = os.fork()
+        if pid > 0:
+            fpid = open(PIDFILE, 'w')
+            fpid.write(str(pid))
+            fpid.close()
+            sys.exit(0)
+    except OSError as e:
+        print("Fork #2 failed: {} ({})".format(e.errno, e.strerror))
+        sys.exit(1)
+
+    si = file("/dev/null", 'r')
+    so = file(LOGFILE, 'a+')
+    se = file("/dev/null", 'a+', 0)
+
+    os.dup2(si.fileno(), sys.stdin.fileno())
+    os.dup2(so.fileno(), sys.stdout.fileno())
+    os.dup2(se.fileno(), sys.stderr.fileno())
+
+def log(msg):
+    sys.stdout.write(str(datetime.now()))
+    sys.stdout.write(": ")
+    sys.stdout.write(msg)
+    sys.stdout.write("\n")
+    sys.stdout.flush()
+
+try:
+    ui = UInput(CAPABILITIES, name="Touchscreen", bustype=e.BUS_USB)
+
+except uinput.UInputError as e:
+    sys.stdout.write(e.message)
+    sys.stdout.write("Have you tried running as root? sudo {}".format(sys.argv[0]))
+    sys.exit(0)
+
+
+from hyperpixel2r import Touch
+
+
+last_status = [False, False]
+last_status_xy = [(0, 0), (0, 0)]
+
+
+def write_status(touch_id, x, y, touch_state):
+    if touch_id > 1:  # Support touches 0 and 1
+        return
+
+    if touch_state:
+        ui.write(e.EV_ABS, e.ABS_MT_SLOT, touch_id)
+
+        if not last_status[touch_id]: # Contact one press
+            ui.write(e.EV_ABS, e.ABS_MT_TRACKING_ID, touch_id)
+            ui.write(e.EV_ABS, e.ABS_MT_POSITION_X, x)
+            ui.write(e.EV_ABS, e.ABS_MT_POSITION_Y, y)
+            ui.write(e.EV_KEY, e.BTN_TOUCH, 1)
+            ui.write(e.EV_ABS, e.ABS_X, x)
+            ui.write(e.EV_ABS, e.ABS_Y, y)
+
+        elif not last_status[touch_id] or (x, y) != last_status_xy[touch_id]:
+            if x != last_status_xy[touch_id][0]: ui.write(e.EV_ABS, e.ABS_X, x)
+            if y != last_status_xy[touch_id][1]: ui.write(e.EV_ABS, e.ABS_Y, y)
+            ui.write(e.EV_ABS, e.ABS_MT_POSITION_X, x)
+            ui.write(e.EV_ABS, e.ABS_MT_POSITION_Y, y)
+
+        last_status_xy[touch_id] = (x, y)
+        last_status[touch_id] = True
+
+        ui.write(e.EV_SYN, e.SYN_REPORT, 0)
+        ui.syn()
+
+    elif not touch_state and last_status[touch_id]:
+        ui.write(e.EV_ABS, e.ABS_MT_SLOT, touch_id)
+        ui.write(e.EV_ABS, e.ABS_MT_TRACKING_ID, -1)
+        ui.write(e.EV_KEY, e.BTN_TOUCH, 0)
+        last_status[touch_id] = False
+
+        ui.write(e.EV_SYN, e.SYN_REPORT, 0)
+        ui.syn()
+
+
+log("HyperPixel2r Touch daemon running...")
+
+touch = Touch()
+
+
+@touch.on_touch
+def handle_touch(touch_id, x, y, state):
+    write_status(touch_id, x, y, state)
+
+
+signal.pause()
+
+log("HyperPixel2r Touch daemon shutting down...")
+
+ui.close()