From 8ebf85df68d4e7a40c4a09c0891179a720f1cb0d Mon Sep 17 00:00:00 2001
From: Adeeb Shihadeh <adeebshihadeh@gmail.com>
Date: Fri, 30 Jun 2023 14:37:01 -0700
Subject: [PATCH] anomalous touch logger (#147)

* anomalous touch logger

* service

* add evdev

* rename

* Update userspace/files/phantom_touch_logger.service
---
 userspace/files/phantom_touch_logger.service | 10 ++++++
 userspace/services.sh                        |  1 +
 userspace/usr/comma/phantom_touch_logger.py  | 35 ++++++++++++++++++++
 3 files changed, 46 insertions(+)
 create mode 100644 userspace/files/phantom_touch_logger.service
 create mode 100755 userspace/usr/comma/phantom_touch_logger.py

diff --git a/userspace/files/phantom_touch_logger.service b/userspace/files/phantom_touch_logger.service
new file mode 100644
index 0000000..68ca8f1
--- /dev/null
+++ b/userspace/files/phantom_touch_logger.service
@@ -0,0 +1,10 @@
+[Unit]
+After=multi-user.target
+
+[Service]
+User=comma
+Restart=no
+ExecStart=/usr/local/pyenv/shims/python -u /usr/comma/phantom_touch_logger.py
+
+[Install]
+WantedBy=multi-user.target
diff --git a/userspace/services.sh b/userspace/services.sh
index 2b0bcc7..900ba9b 100755
--- a/userspace/services.sh
+++ b/userspace/services.sh
@@ -25,6 +25,7 @@ systemctl enable ssh-param-watcher.service
 systemctl enable home.mount
 systemctl enable logrotate-hourly.timer
 systemctl enable set_time.service
+systemctl enable phantom_touch_logger.service
 
 # Disable some of our services
 systemctl disable serial-hostname.service
diff --git a/userspace/usr/comma/phantom_touch_logger.py b/userspace/usr/comma/phantom_touch_logger.py
new file mode 100755
index 0000000..c3fd07f
--- /dev/null
+++ b/userspace/usr/comma/phantom_touch_logger.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+import sys
+from collections import deque
+from evdev import InputDevice, ecodes
+
+def log(msg):
+  # TODO: keep buffer of touch events + coords and dump after log
+  print(msg, file=sys.stderr)
+
+if __name__ == "__main__":
+  touch_starts = deque([0.]*20, maxlen=20)
+
+  dev = InputDevice('/dev/input/by-path/platform-894000.i2c-event')
+  for event in dev.read_loop():
+    #print(event.type, event.code, event.value)
+
+    # TODO: consider multitouch events
+    if event.type == ecodes.EV_KEY and event.code == ecodes.BTN_TOUCH:
+      if event.value == 1:
+        touch_starts.append(event.timestamp())
+
+        avg_touch_dt = (max(touch_starts) - min(touch_starts)) / len(touch_starts)
+        avg_touch_freq = 1 / (avg_touch_dt + 0.0001)
+        if avg_touch_freq > 15:
+          log(f"Quick touch frequency {avg_touch_freq:.2f}s / {event}")
+
+        if len(touch_starts) > 2:
+          dt = (touch_starts[-1] - touch_starts[-2])
+          if dt < 0.02:
+            log(f"Quick consecutive touches {dt:.2f}s / {event}")
+      elif event.value == 0:
+        if len(touch_starts):
+          dt = event.timestamp() - touch_starts[-1]
+          if dt > 10.:
+            log(f"Touch point persisted for {dt:.2f}s / {event}")