board/common: probe for wifi radios

Relocate probe of wifi radios from gen-hardware to 00-probe.  This saves
one python invocation and some precious CPU cycles at boot.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/rootfs/usr/libexec/infix/init.d/00-probe

@@ -521,6 +521,52 @@ def probe_dtsystem(out):
     return 0
 
 
+def probe_wifi_radios(out):
+    """Probe wifi radios via sysfs/iw and store in output dict."""
+    # feature-wifi is the only Buildroot package that enables CONFIG_MAC80211/
+    # CONFIG_CFG80211, so this directory exists iff WiFi support is built in.
+    # feature-wifi also selects BR2_PACKAGE_IW, so iw(8) is always available
+    # when this directory exists -- no separate iw check needed.
+    ieee80211 = "/sys/class/ieee80211"
+    if not os.path.exists(ieee80211):
+        return
+
+    radios = sorted(os.listdir(ieee80211))
+    if not radios:
+        return
+
+    out["wifi-radios"] = []
+    for phy in radios:
+        info = {"name": phy, "bands": []}
+        try:
+            result = subprocess.run(
+                ["iw", "phy", phy, "info"],
+                capture_output=True, text=True, timeout=5
+            )
+            if result.returncode != 0:
+                continue
+        except Exception:
+            continue
+
+        freqs = []
+        for line in result.stdout.splitlines():
+            stripped = line.strip()
+            if stripped.startswith("* ") and "MHz" in stripped:
+                try:
+                    freqs.append(int(float(stripped.split()[1])))
+                except (ValueError, IndexError):
+                    pass
+
+        if any(2400 <= f <= 2500 for f in freqs):
+            info["bands"].append({"name": "2.4GHz"})
+        if any(5150 <= f <= 5900 for f in freqs):
+            info["bands"].append({"name": "5GHz"})
+        if any(5955 <= f <= 7115 for f in freqs):
+            info["bands"].append({"name": "6GHz"})
+
+        out["wifi-radios"].append(info)
+
+
 def main():
     out = {
         "vendor": None,
@@ -546,6 +592,8 @@ def main():
     if err:
         return err
 
+    probe_wifi_radios(out)
+
     if not out["factory-password-hash"]:
         sys.stdout.write("\n\n\033[31mCRITICAL BOOTSTRAP ERROR\n" +
                          "NO FACTORY PASSWORD FOUND\033[0m\n\n")

src/confd/bin/gen-hardware

@@ -6,7 +6,11 @@ if jq -e '.["usb-ports"]' /run/system.json > /dev/null; then
 else
     usb_ports=""
 fi
-wifi_radios=$(/usr/libexec/infix/iw.py list 2>/dev/null | jq -r '.[]' || echo "")
+if jq -e '.["wifi-radios"]' /run/system.json > /dev/null 2>&1; then
+    wifi_radios=$(jq -r '.["wifi-radios"][].name' /run/system.json)
+else
+    wifi_radios=""
+fi
 
 
 gen_port()
@@ -27,11 +31,9 @@ gen_radio()
 {
     radio="$1"
 
-    # Detect supported bands from iw.py info JSON output
-    phy_info=$(/usr/libexec/infix/iw.py info "$radio" 2>/dev/null || echo '{"bands":[]}')
-    # Check if 2.4GHz band exists (band name "2.4GHz")
+    # Read band info from system.json (probed at boot by 00-probe)
+    phy_info=$(jq -r --arg r "$radio" '.["wifi-radios"][] | select(.name == $r)' /run/system.json 2>/dev/null || echo '{"bands":[]}')
     has_2ghz=$(echo "$phy_info" | jq '[.bands[] | select(.name == "2.4GHz")] | length')
-    # Check if 5GHz band exists (band name "5GHz")
     has_5ghz=$(echo "$phy_info" | jq '[.bands[] | select(.name == "5GHz")] | length')
 
     # Determine band setting