Add wireless reprobe service for post-mount firmware loading

device.mk

@@ -287,7 +287,8 @@ PRODUCT_PACKAGES += \
     com.android.hardware.wifi.hostapd.opi5 \
     com.android.hardware.wifi.supplicant.opi5 \
     libwpa_client \
-    wificond
+    wificond \
+    wireless_reprobe.sh
 
 PRODUCT_COPY_FILES += \
     frameworks/native/data/etc/android.hardware.wifi.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.wifi.xml

sepolicy/file_contexts

@@ -49,4 +49,6 @@
 /dev/block/by-name/boot     u:object_r:boot_block_device:s0
 
 #V4L2
-/vendor/bin/hw/android\.hardware\.media\.c2@1\.2-service-v4l2(.*)?  u:object_r:mediacodec_exec:s0
+/vendor/bin/hw/android\.hardware\.media\.c2@1\.2-service-v4l2(.*)?  u:object_r:mediacodec_exec:s0
+# WiFi
+/vendor/bin/wireless_reprobe\.sh  u:object_r:wireless_reprobe_exec:s0

sepolicy/wireless_reprobe.te

@@ -0,0 +1,16 @@
+# Domain for wireless_reprobe.sh: re-probes wireless drivers via sysfs after
+# /vendor is mounted (see wifi/wireless_reprobe.sh). Runs once from init at
+# post-fs as a oneshot service.
+type wireless_reprobe, domain;
+type wireless_reprobe_exec, exec_type, vendor_file_type, file_type;
+
+init_daemon_domain(wireless_reprobe)
+
+# Execute the vendor shell and toybox for the script interpreter
+allow wireless_reprobe vendor_shell_exec:file rx_file_perms;
+allow wireless_reprobe vendor_toolbox_exec:file rx_file_perms;
+
+# Walk /sys/bus/{usb,serial}/devices and write to drivers_probe/unbind
+allow wireless_reprobe sysfs:dir r_dir_perms;
+allow wireless_reprobe sysfs:file rw_file_perms;
+allow wireless_reprobe sysfs:lnk_file read;

wifi/Android.bp

@@ -3,6 +3,15 @@
 //
 // SPDX-License-Identifier: Apache-2.0
 
+// Re-probes wireless drivers after /vendor mounts so firmware-dependent
+// probes that failed during early kernel init get a working second chance.
+sh_binary {
+    name: "wireless_reprobe.sh",
+    src: "wireless_reprobe.sh",
+    vendor: true,
+    init_rc: ["init.tart.wifi.rc"],
+}
+
 prebuilt_etc {
     name: "android.hardware.wifi.hostapd-service.rc",
     src: "android.hardware.wifi.hostapd-service.rc",

wifi/init.tart.wifi.rc

@@ -0,0 +1,11 @@
+# Re-probe wireless drivers whose early firmware requests failed because
+# /vendor was not yet mounted. See wireless_reprobe.sh for details.
+service wireless_reprobe /vendor/bin/wireless_reprobe.sh
+    class core
+    user root
+    group root
+    oneshot
+    disabled
+
+on post-fs
+    start wireless_reprobe

wifi/wireless_reprobe.sh

@@ -0,0 +1,38 @@
+#!/vendor/bin/sh
+#
+# wireless_reprobe.sh - re-probe wireless drivers once /vendor is mounted.
+#
+# Built-in wireless drivers probe during early kernel init, before /vendor
+# (which holds all firmware; see the kernel's patched fw_path[]) is mounted.
+# Their firmware requests fail fast with ENOENT and the kernel never retries,
+# leaving the hardware driverless or degraded. Run from init at post-fs
+# (i.e. after /vendor is mounted) via init.tart.wifi.rc, this script:
+#
+#  1. Re-probes every driverless USB interface, so a USB WiFi adapter that
+#     was plugged in at power-on (and whose driver probe failed on the
+#     missing firmware) gets a second probe that can now load firmware.
+#  2. Rebinds the Broadcom Bluetooth serdev device, so hci_bcm reloads its
+#     .hcd patch firmware (e.g. brcm/SYN43711A0.hcd). Without the patch the
+#     controller runs with unpatched defaults, which cripples TX power/range.
+#
+# Both operations are idempotent and safe: already-bound USB interfaces are
+# skipped, and the BT rebind simply re-registers hci0 before the Bluetooth
+# stack starts.
+
+# 1. USB: ask the kernel to re-run driver matching for unbound interfaces
+#    (directories like 1-1:1.0 without a "driver" symlink).
+for intf in /sys/bus/usb/devices/*:*; do
+    [ -e "$intf/driver" ] && continue
+    echo "${intf##*/}" > /sys/bus/usb/drivers_probe 2>/dev/null
+done
+
+# 2. Bluetooth: unbind + re-probe serdev devices so the hci_bcm driver's
+#    firmware patch request runs again with /vendor/firmware available.
+for dev in /sys/bus/serial/devices/*; do
+    [ -e "$dev/driver" ] || continue
+    name="${dev##*/}"
+    echo "$name" > "$dev/driver/unbind" 2>/dev/null
+    echo "$name" > /sys/bus/serial/drivers_probe 2>/dev/null
+done
+
+exit 0