Only unbind if device is bound to a driver.

.gitignore

@@ -160,3 +160,5 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+/*util.sh

src/pci_passthrough_assist/pci_device.py

@@ -14,11 +14,30 @@ class PciDevice:
     def is_vga(self) -> bool:
         return exists(f"/sys/bus/pci/devices/{self.device_id}/boot_vga")
 
+    def vendor_code(self, remove_prefix: bool = True) -> str:
+        with open(f"/sys/bus/pci/devices/{self.device_id}/vendor") as vendor:
+            return vendor.read() if not remove_prefix else vendor.read(
+            ).lstrip("0x")
+
+    def device_code(self, remove_prefix: bool = True) -> str:
+        with open(f"/sys/bus/pci/devices/{self.device_id}/vendor") as device:
+            return device.read() if not remove_prefix else device.read(
+            ).lstrip("0x")
+
     def unbind_driver(self):
-        with open(f"/sys/bus/pci/devices/{self.device_id}/driver/unbind",
+        driver_unbind_path = f"/sys/bus/pci/devices/{self.device_id}/driver/unbind"
-                  "w") as device_driver:
+        if not exists(driver_unbind_path):
+            print("Device is not bound to any driver.")
+            return
+
+        with open(driver_unbind_path, "w") as device_driver:
             device_driver.write(self.device_id)
 
+    def set_driver_override(self, reserved_for_driver: str):
+        with open(f"/sys/bus/pci/devices/{self.device_id}/driver_override",
+                  "w") as driver_override:
+            driver_override.write(reserved_for_driver)
+
     def bind_to_driver(self, driver_to_bind: str, unbind_first: bool = True):
         if unbind_first:
             self.unbind_driver()