From 7499d3577ca9f1426d827fe7a0b087c4f741fa8a Mon Sep 17 00:00:00 2001
From: Adeeb Shihadeh <adeebshihadeh@gmail.com>
Date: Wed, 6 May 2026 19:49:14 -0700
Subject: [PATCH] handle in lte.sh

---
 userspace/root/usr/comma/comma-init.sh |  6 -----
 userspace/root/usr/comma/lte/lte.sh    | 33 ++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/userspace/root/usr/comma/comma-init.sh b/userspace/root/usr/comma/comma-init.sh
index fb87962..4376cdd 100755
--- a/userspace/root/usr/comma/comma-init.sh
+++ b/userspace/root/usr/comma/comma-init.sh
@@ -80,12 +80,6 @@ function init_permissions (
     chmod 0660 "$path"
   done
 
-  # serial tty group
-  for path in /dev/tty[A-Z]*[0-9] /dev/ttymxc[0-9]*; do
-    [[ -c "$path" ]] || continue
-    chgrp dialout "$path"
-    chmod 0660 "$path"
-  done
 )
 
 function init_video (
diff --git a/userspace/root/usr/comma/lte/lte.sh b/userspace/root/usr/comma/lte/lte.sh
index 95ee3f3..febd9c5 100755
--- a/userspace/root/usr/comma/lte/lte.sh
+++ b/userspace/root/usr/comma/lte/lte.sh
@@ -35,6 +35,38 @@ function is_modem_sysfs {
   return 1
 }
 
+function setup_modem_ttys {
+  local path name iface found i
+
+  for i in {0..300}; do
+    found=0
+    for path in /sys/class/tty/ttyUSB* /sys/class/tty/ttyACM*; do
+      [[ -e "$path" ]] || continue
+      is_modem_sysfs "$path" || continue
+
+      name="${path##*/}"
+      [[ -c "/dev/$name" ]] || continue
+      chgrp dialout "/dev/$name"
+      chmod 0660 "/dev/$name"
+      found=1
+
+      iface="$(realpath "$path")"
+      while [[ "$iface" != "/" && ! -r "$iface/bInterfaceNumber" ]]; do
+        iface="${iface%/*}"
+      done
+
+      [[ -r "$iface/bInterfaceNumber" && "$(< "${iface%:*}/idVendor")" == "2c7c" ]] || continue
+      case "$(< "$iface/bInterfaceNumber")" in
+        02) ln -sfn "/dev/$name" /dev/modem_at0 ;;
+        03) ln -sfn "/dev/$name" /dev/modem_at1 ;;
+      esac
+    done
+
+    ((found)) && return
+    sleep 0.01
+  done
+}
+
 function report_modem_kernel_events {
   local path name subsystem
 
@@ -108,6 +140,7 @@ case "$1" in
       reset
       power_button
     done
+    setup_modem_ttys
     report_modem_kernel_events
 
     ;;