feat(revpiconfig): Enhance Wi-Fi detection and add rfkill index support

Improved logic to detect built-in and third-party Wi-Fi interfaces,
including integration of `rfkill` index retrieval for Wi-Fi devices.
This enhances support for various hardware setups and allows better
control over Wi-Fi functionality.

src/revpi_middleware/dbus_middleware1/system_config/revpi_config.py

@@ -6,10 +6,11 @@ import shutil
 import subprocess
 from collections import namedtuple
 from enum import Enum, IntEnum
+from glob import glob
 from logging import getLogger
 from os import X_OK, access
-from os.path import exists
-from typing import List
+from os.path import exists, join
+from typing import List, Optional
 
 from pydbus import SystemBus
 
@@ -19,6 +20,7 @@ log = getLogger(__name__)
 
 ConfigVariable = namedtuple("ConfigVariable", ["name", "value", "line_index"])
 
+LINUX_WIFI_CLASS_PATH = "/sys/class/ieee80211"
 CONFIG_TXT_LOCATIONS = ("/boot/firmware/config.txt", "/boot/config.txt")
 
 
@@ -45,6 +47,8 @@ class RevPiConfig:
         self._cm_with_wifi = False
 
         self._revpi_with_con_bridge = False
+        self._wlan_class_path = ""
+        self._wlan_rfkill_index = None
 
         self.serial = ""
         self.model = ""
@@ -81,8 +85,26 @@ class RevPiConfig:
         # Detect WiFi on CM module
         could_have_wifi = self._cm_type in (ComputeModuleTypes.CM4, ComputeModuleTypes.CM5)
         if could_have_wifi:
-            lst_grep = grep("DRIVER=brcmfmac", "/sys/class/ieee80211/phy0/device/uevent")
-            self._cm_with_wifi = len(lst_grep) > 0 and self._cm_type in (ComputeModuleTypes)
+            wifi_interface = join(LINUX_WIFI_CLASS_PATH, "phy0")
+            lst_grep = grep("DRIVER=brcmfmac", join(wifi_interface, "device", "uevent"))
+            self._cm_with_wifi = len(lst_grep) > 0
+            self._wlan_class_path = wifi_interface
+
+        # If no build in Wi-Fi on the CM, detect third party Wi-Fi on RevPi Flat
+        if not self._cm_with_wifi and grep("revpi-flat", "/proc/device-tree/compatible"):
+            lst_wifi_interfaces = glob("/sys/class/ieee80211/*")
+            for wifi_interface in lst_wifi_interfaces:
+                if grep("DRIVER=mwifiex_sdio", join(wifi_interface, "device", "uevent")):
+                    self._cm_with_wifi = True
+                    self._wlan_class_path = wifi_interface
+
+        # Detect rfkill index of the integrated Wi-Fi device
+        if self._wlan_class_path:
+            for rfkill_path in glob(join(self._wlan_class_path, "rfkill*")):
+                match_index = re.match(r"^/.+/rfkill(?P<index>\d+)$", rfkill_path)
+                if match_index:
+                    self._wlan_rfkill_index = int(match_index.group("index"))
+                    break
 
         # Detect ConBridge
         could_have_con_bridge = self._cm_type in (ComputeModuleTypes.CM3, ComputeModuleTypes.CM4S)
@@ -94,6 +116,10 @@ class RevPiConfig:
     def cm_type(self) -> ComputeModuleTypes:
         return self._cm_type
 
+    @property
+    def rfkill_index(self) -> Optional[int]:
+        return self._wlan_rfkill_index
+
     @property
     def with_con_bridge(self) -> bool:
         return self._revpi_with_con_bridge
@@ -331,6 +357,8 @@ if __name__ == "__main__":
     print("Serial:         ", rc.serial)
     print("CM Type:        ", rc.cm_type.name)
     print("With wifi:      ", rc.with_wifi)
+    if rc.with_wifi:
+        print("  rfkill index: ", rc.rfkill_index)
     print("With con-bridge:", rc.with_con_bridge)
 
     config_txt = ConfigTxt()