* add adbd monitor

buildroot/board/cvitek/SG200X/overlay/etc/adbd_monitor.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+UDC_PATH=/sys/kernel/config/usb_gadget/g0/UDC
+if [ -f /boot/usb.adbd ] && [ -f /boot/usb.dev ];
+then
+    while true; do
+        if [ -z "$(cat $UDC_PATH | tr -d '[:space:]')" ];
+        then
+            echo "try restart usb device"
+            /etc/init.d/S03usbdev stop
+            /etc/init.d/S03usbdev start
+        fi
+        sleep 5
+    done
+fi

buildroot/board/cvitek/SG200X/overlay/etc/init.d/S08usbdev

@@ -196,6 +196,13 @@ then
 			sleep 0.4
 		done
 		echo device > /proc/cviusb/otg_role
+
+        if [ -e /boot/usb.adbd ]
+        then
+            if [ -z $(ps aux | grep adbd_monitor | grep -v grep) ]; then
+                /etc/adbd_monitor.sh &
+            fi
+        fi
 	fi
 fi
 
@@ -222,5 +229,16 @@ then
 		unlink /sys/kernel/config/usb_gadget/g0/configs/c.1/ncm.usb0
 		rmdir /sys/kernel/config/usb_gadget/g0/functions/ncm.usb0
 	fi
+
+    # adbd
+     if [ -e /sys/kernel/config/usb_gadget/g0/configs/c.1/ffs.adb ]
+     then
+        adbd_pid=$(ps aux | grep '/usr/bin/adbd' | grep -v grep | awk '{print $1}')
+        kill -15 $adbd_pid
+        umount /dev/usb-ffs/adb
+        rm /dev/usb-ffs/adb -rf
+        unlink /sys/kernel/config/usb_gadget/g0/configs/c.1/ffs.adb
+        rmdir /sys/kernel/config/usb_gadget/g0/functions/ffs.adb
+     fi
 fi