figuring out adb device agent

userspace/usr/comma/adb_usb.sh

@@ -0,0 +1,70 @@
+#!/bin/sh
+#
+# Copyright (c) 2012-2015, 2018, The Linux Foundation. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of The Linux Foundation nor the names of its
+#       contributors may be used to endorse or promote products derived from
+#       this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE DISCLAIMED.  IN NO
+# EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+case "$1" in
+  start)
+    # Mount configfs and create ADB function
+    mount -t configfs none /sys/kernel/config
+    if [ -d /sys/kernel/config/usb_gadget ]; then
+      cd /sys/kernel/config/usb_gadget
+      mkdir g1
+      cd g1
+      mkdir strings/0x409
+      mkdir configs/c.1
+      mkdir configs/c.1/strings/0x409
+      mkdir functions/ffs.adb
+
+      # Set basic device information
+      echo "6192" > strings/0x409/serialnumber
+      echo "comma.ai" > strings/0x409/manufacturer
+      echo "comma 3x" > strings/0x409/product
+    fi
+
+    # Mount functionfs for ADB
+    mkdir -p /dev/usb-ffs/adb
+    mount -o uid=2000,gid=2000 -t functionfs adb /dev/usb-ffs/adb
+    mount -o remount,gid=5,mode=620 /dev/pts
+
+    # Enable USB gadget
+    if [ -d /sys/class/android_usb/android0 ]; then
+      echo 1 > /sys/class/android_usb/android0/enable
+    fi
+    ;;
+
+  stop)
+    echo "Stopping USB Android Gadget"
+    ;;
+
+  restart)
+    $0 stop
+    $0 start
+    ;;
+  *)
+    echo "Usage usb { start | stop | restart}" >&2
+    exit 1
+    ;;
+esac
+

userspace/usr/comma/comma.sh

@@ -43,6 +43,14 @@ handle_setup_keys () {
   fi
 }
 
+handle_adb () {
+  bash "$(dirname "$0")/adb_usb.sh start"
+    # Start ADB daemon if not already running
+  if ! pgrep adbd > /dev/null; then
+    "$(dirname "$0")/adbd" &
+  fi
+}
+
 # factory reset handling
 if [ -f "$RESET_TRIGGER" ]; then
   echo "launching system reset, reset trigger present"
@@ -73,6 +81,9 @@ while true; do
   pkill -f "$SETUP"
   handle_setup_keys
 
+  echo "adb setup"
+  handle_adb
+
   if [ -f $CONTINUE ]; then
     exec "$CONTINUE"
   fi