WLAN autoconfiguration through wpa_supplicant and mdev rules

board/raspberrypi/device_table.txt

@@ -6,4 +6,7 @@
 /etc/ssh/ssh_host_rsa_key				f	    600	    0	    0	    -	    -	    -	    -	    -
 
 #rtl8821cu usb modeswitch script
-/lib/mdev/rtl8821cu_usb_modeswitch.sh   f       755     0       0       -       -       -       -       -
+/lib/mdev/rtl8821cu_usb_modeswitch.sh   f       755     0       0       -       -       -       -       -
+
+# WLAN setup
+/lib/mdev/wlan_setup.sh                 f       755     0       0       -       -       -       -       -

board/raspberrypi/post-build.sh

@@ -21,3 +21,17 @@
 # Add usb_modeswitch mdev rule
 grep -q "usb_modeswitch" "$TARGET_DIR/etc/mdev.conf" || \
     echo '$PRODUCT=bda/1a2b.* root:root 0660 */lib/mdev/rtl8821cu_usb_modeswitch.sh' >> "$TARGET_DIR/etc/mdev.conf"
+
+# Add wlan_setup mdev rule
+grep -q "wlan_setup" "$TARGET_DIR/etc/mdev.conf" || \
+    echo '$PRODUCT=bda/c820.* root:root 0660 */lib/mdev/wlan_setup.sh' >> "$TARGET_DIR/etc/mdev.conf"
+
+# Add wlan0 configuration
+grep -q "iface wlan0" "$TARGET_DIR/etc/network/interfaces" || \
+    cat >> "$TARGET_DIR/etc/network/interfaces" << 'EOF'
+
+auto wlan0
+iface wlan0 inet dhcp
+    pre-up ip link set wlan0 up
+    pre-up wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf
+EOF

board/raspberrypi/rootfs-overlay/etc/wpa_supplicant.conf

@@ -0,0 +1,4 @@
+network={
+    ssid="Gabriel_2G"
+    psk="gabrielwifi"
+}

board/raspberrypi/rootfs-overlay/lib/mdev/wlan_setup.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+case "$ACTION" in
+    add)
+        [ -e /sys/class/net/wlan0 ] || exit 0
+        ifdown wlan0 2>/dev/null
+        killall wpa_supplicant 2>/dev/null
+        ifup wlan0
+        ;;
+    remove)
+        ifdown wlan0 2>/dev/null
+        killall wpa_supplicant 2>/dev/null
+        ;;
+esac