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+#!/bin/bash
+
+###
+# This script automate the setup of QMI supported wwan devices.
+#
+# Tested on following environment:
+#   * Lenovo ThinkPad X220 (4286-CTO)
+#   * Gentoo/Linux, Linux Kernel 3.9.6
+#   * NTT Docomo UIM card (Xi LTE SIM)
+#   * Sierra Wireless, Inc. Gobi 3000 wireless wan module
+#     (FRU 60Y3257, vendor and device id is 1199:9013)
+#     memo:
+#       I recommend to check if your wwan module works fine
+#       for your mobile broadband provider with Windows
+#       especially if you imported the device from other country.
+#       You may have to initialize your device for your region.
+#   * Required kernel config (other modules may be also required):
+#     - qmi_wwan (CONFIG_USB_NET_QMI_WWAN)
+#     - qcserial (CONFIG_USB_SERIAL_QUALCOMM)
+#   * Required settings:
+#     - you may have to create /etc/qmi-network.conf.
+#       My qmi-network.conf has only a line "APN=mopera.net".
+#
+
+# your wwan device name created by qmi_wwan kernel module
+# check it with "ip a" or "ifconfig -a". it may be wwan0?
+WWAN_DEV=wwp0s20f0u6
+# your cdc_wdm modem location
+CDC_WDM=/dev/cdc-wdm0
+# this script uses following qmi commands
+QMICLI=/usr/bin/qmicli
+QMI_NETWORK=/usr/bin/qmi-network
+# the places of following commands vary depending on your distribution
+IFCONFIG=/usr/bin/ifconfig
+DHCPCD=/usr/bin/dhcpcd
+SUDO=/usr/bin/sudo
+
+function helpmsg {
+    echo "usage: $0 {start|stop|restart|status}"
+    exit 1
+}
+
+function qmi_start {
+    $COMMAND_PREFIX $IFCONFIG $WWAN_DEV up
+    $COMMAND_PREFIX $QMICLI -d $CDC_WDM --dms-set-operating-mode=online
+    if [ $? -ne 0 ]; then
+	echo "your wwan device may be RFKilled?"
+	exit 1
+    fi
+    $COMMAND_PREFIX $QMI_NETWORK $CDC_WDM start
+    $COMMAND_PREFIX $DHCPCD $WWAN_DEV
+}
+
+function qmi_stop {
+    $COMMAND_PREFIX $QMI_NETWORK $CDC_WDM stop
+    $COMMAND_PREFIX kill `cat /var/run/dhcpcd-${WWAN_DEV}.pid`
+    $COMMAND_PREFIX $IFCONFIG $WWAN_DEV down
+}
+
+function qmi_strength {
+    dbm=`$COMMAND_PREFIX $QMICLI -d $CDC_WDM --nas-get-signal-strength | tr "'" " " | grep Network | head -1 | awk '{print $4}'`
+    echo -n "Signal strength is "
+    if [ $dbm -ge -73 ]; then
+	echo -n 'Excellent'
+    elif [ $dbm -ge -83 ]; then
+	echo -n 'Good'
+    elif [ $dbm -ge -93 ]; then
+	echo -n 'OK'
+    elif [ $dbm -ge -109 ]; then
+	echo -n 'Marginal'
+    else
+	echo Unknown
+    fi
+    echo " (${dbm} dBm)"
+}
+
+function qmi_status {
+    $COMMAND_PREFIX $QMI_NETWORK $CDC_WDM status
+    qmi_strength
+}
+
+# check argument number
+if [ $# -ne 1 ]
+then
+    helpmsg
+fi
+
+# check permission
+if [ `whoami` != 'root' ]
+then
+    echo "warning: root permission required. setting command prefix to 'sudo'."
+    COMMAND_PREFIX=$SUDO
+fi
+
+# run commands
+case $1 in
+    start) qmi_start ;;
+    stop) qmi_stop ;;
+    restart) qmi_stop; qmi_start ;;
+    status) qmi_status ;;
+    *) helpmsg ;;
+esac
+
+