fix socket

system/hardware/tests/test_usb.py

@@ -0,0 +1,21 @@
+from openpilot.system.hardware import usb
+
+
+def test_chestnut_present(tmp_path, monkeypatch):
+  monkeypatch.setattr(usb, "USB_DEVICES_PATH", tmp_path)
+  device = tmp_path / "1-1"
+  device.mkdir()
+  (device / "idVendor").write_text("add1\n")
+  (device / "idProduct").write_text("0001\n")
+
+  assert usb.chestnut_present()
+
+
+def test_chestnut_absent_for_other_usb_device(tmp_path, monkeypatch):
+  monkeypatch.setattr(usb, "USB_DEVICES_PATH", tmp_path)
+  device = tmp_path / "1-1"
+  device.mkdir()
+  (device / "idVendor").write_text("18d1\n")
+  (device / "idProduct").write_text("4ee7\n")
+
+  assert not usb.chestnut_present()

system/hardware/usb.py

@@ -20,6 +20,14 @@ def usb_devices() -> list[Path]:
     return []
 
 
+def chestnut_present() -> bool:
+  return any(
+    read_int(device / "idVendor", 16) == CHESTNUT_VENDOR_ID and
+    read_int(device / "idProduct", 16) == CHESTNUT_PRODUCT_ID
+    for device in usb_devices()
+  )
+
+
 def controller(device: Path) -> Path | None:
   try:
     return next((parent for parent in device.resolve().parents if parent.name.endswith(".ssusb")), None)