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#!/bin/sh
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# Cellular Modem Auto-Detector for OpenWrt
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# Outputs discovered modems in JSON format and updates /tmp/run/modem-manager/devices.json
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RUN_DIR="/tmp/run/modem-manager"
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CACHE_FILE="$RUN_DIR/devices.json"
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KNOWN_VENDORS="2c7c 2cb7 1e0e 12d1 19d2 1bbb 05c6 413c 0bdb 1199 2977 1508 1bc7 0e8d 1782 0489 1fac 2dee 33f8 3731 2df3 20a6"
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get_sys_attr() {
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local path="$1"
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if [ -f "$path" ]; then
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tr -d '\r\n' < "$path" 2>/dev/null
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fi
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}
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detect_all() {
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echo "{"
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echo ' "devices": ['
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local FIRST=1
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for dev in /sys/bus/usb/devices/*; do
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[ -d "$dev" ] || continue
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[ -f "$dev/idVendor" ] || continue
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[ -f "$dev/idProduct" ] || continue
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local VID=$(get_sys_attr "$dev/idVendor")
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local PID=$(get_sys_attr "$dev/idProduct")
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local DEVCLASS=$(get_sys_attr "$dev/bDeviceClass")
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case "$VID" in
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1d6b|2109|1d50) continue ;;
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esac
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[ "$DEVCLASS" = "09" ] && continue
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local IS_MODEM=0
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for kv in $KNOWN_VENDORS; do
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if [ "$VID" = "$kv" ]; then
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IS_MODEM=1
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break
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fi
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done
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local DEVNAME=$(basename "$dev")
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# Direct sysfs tree discovery for serial ports under this USB device
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local TTYS=""
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for t in $(find "$dev" -maxdepth 5 \( -name "ttyUSB*" -o -name "ttyACM*" \) 2>/dev/null); do
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local b=$(basename "$t")
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case "$b" in
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ttyUSB*|ttyACM*)
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if [ -e "/dev/$b" ]; then
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case " $TTYS " in
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*" /dev/$b "*) ;;
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*) TTYS="$TTYS /dev/$b" ;;
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esac
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fi
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;;
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esac
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done
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# Fallback tty search via /sys/class/tty
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if [ -z "$TTYS" ]; then
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for t in /sys/class/tty/ttyUSB* /sys/class/tty/ttyACM*; do
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[ -e "$t" ] || continue
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local t_target=$(readlink "$t" 2>/dev/null || readlink -f "$t" 2>/dev/null)
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case "$t_target" in
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*"$DEVNAME"*)
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local b=$(basename "$t")
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[ -e "/dev/$b" ] && case " $TTYS " in *" /dev/$b "*) ;; *) TTYS="$TTYS /dev/$b" ;; esac
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;;
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esac
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done
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fi
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TTYS=$(echo "$TTYS" | sed 's/^ *//')
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# Network interfaces discovery under this USB device
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local NETS=""
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for n in $(find "$dev" -maxdepth 5 -name "net" 2>/dev/null); do
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[ -d "$n" ] || continue
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for iface in "$n"/*; do
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[ -d "$iface" ] || continue
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local b=$(basename "$iface")
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case "$b" in
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lo|br-*|eth*|lan*|wan*|sfp*) ;;
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*) case " $NETS " in *" $b "*) ;; *) NETS="$NETS $b" ;; esac ;;
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esac
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done
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done
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# Fallback net search via /sys/class/net
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if [ -z "$NETS" ]; then
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for n in /sys/class/net/*; do
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[ -d "$n" ] || continue
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local n_target=$(readlink "$n" 2>/dev/null || readlink -f "$n" 2>/dev/null)
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case "$n_target" in
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*"$DEVNAME"*)
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local b=$(basename "$n")
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case "$b" in
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lo|br-*|eth*|lan*|wan*|sfp*) ;;
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*) case " $NETS " in *" $b "*) ;; *) NETS="$NETS $b" ;; esac ;;
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esac
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;;
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esac
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done
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fi
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NETS=$(echo "$NETS" | sed 's/^ *//')
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if [ -n "$TTYS" ] || [ -n "$NETS" ] || [ $IS_MODEM -eq 1 ]; then
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IS_MODEM=1
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fi
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[ $IS_MODEM -eq 1 ] || continue
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local MFG=$(get_sys_attr "$dev/manufacturer")
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local PROD=$(get_sys_attr "$dev/product")
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local SER=$(get_sys_attr "$dev/serial")
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local PRIMARY_TTY=""
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for t in $TTYS; do
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case "$t" in
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*ttyUSB2|*ttyACM0)
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PRIMARY_TTY="$t"
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break
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;;
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esac
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done
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[ -z "$PRIMARY_TTY" ] && PRIMARY_TTY=$(echo "$TTYS" | awk '{print $1}')
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local PRIMARY_NET=$(echo "$NETS" | awk '{print $1}')
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local DRIVER="option"
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for drv in $(find "$dev" -name "driver" 2>/dev/null); do
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local drv_target=$(basename "$(readlink -f "$drv" 2>/dev/null)")
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case "$drv_target" in
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cdc_mbim|cdc_ncm|qmi_wwan|cdc_ether|rndis_host)
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DRIVER="$drv_target"
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break
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;;
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esac
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done
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[ $FIRST -eq 1 ] || echo ","
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FIRST=0
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local TTY_JSON=""
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for t in $TTYS; do
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[ -n "$TTY_JSON" ] && TTY_JSON="$TTY_JSON, "
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TTY_JSON="$TTY_JSON\"$t\""
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done
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local NET_JSON=""
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for n in $NETS; do
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[ -n "$NET_JSON" ] && NET_JSON="$NET_JSON, "
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NET_JSON="$NET_JSON\"$n\""
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done
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cat <<EOF
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{
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"id": "$DEVNAME",
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"vid": "$VID",
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"pid": "$PID",
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"vendor": "${MFG:-Generic}",
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"model": "${PROD:-Modem}",
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"serial": "${SER}",
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"driver": "$DRIVER",
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"primary_port": "$PRIMARY_TTY",
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"primary_net": "$PRIMARY_NET",
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"ports": [ $TTY_JSON ],
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"nets": [ $NET_JSON ]
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}
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EOF
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done
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echo " ]"
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echo "}"
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}
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mkdir -p "$RUN_DIR"
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OUTPUT=$(detect_all)
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# Atomic update cache
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echo "$OUTPUT" > "${CACHE_FILE}.tmp" && mv -f "${CACHE_FILE}.tmp" "$CACHE_FILE"
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# Output to stdout if not purely --cache mode
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if [ "$1" != "--cache" ]; then
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echo "$OUTPUT"
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fi
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exit 0
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