use libusb auto-detach feature

bumble/host.py

@@ -121,28 +121,24 @@ class Host(EventEmitter):
             self.hc_acl_data_packet_length     = response.return_parameters.hc_acl_data_packet_length
             self.hc_total_num_acl_data_packets = response.return_parameters.hc_total_num_acl_data_packets
 
-            logger.debug(
-                f'HCI ACL flow control: hc_acl_data_packet_length={self.hc_acl_data_packet_length},'
-                f'hc_total_num_acl_data_packets={self.hc_total_num_acl_data_packets}'
-            )
-
         if self.supports_command(HCI_LE_READ_BUFFER_SIZE_COMMAND):
             response = await self.send_command(HCI_LE_Read_Buffer_Size_Command(), check_result=True)
             self.hc_le_acl_data_packet_length     = response.return_parameters.hc_le_acl_data_packet_length
             self.hc_total_num_le_acl_data_packets = response.return_parameters.hc_total_num_le_acl_data_packets
 
-            logger.debug(
-                f'HCI LE ACL flow control: hc_le_acl_data_packet_length={self.hc_le_acl_data_packet_length},'
-                f'hc_total_num_le_acl_data_packets={self.hc_total_num_le_acl_data_packets}'
-            )
+        if response.return_parameters.hc_le_acl_data_packet_length == 0 or response.return_parameters.hc_total_num_le_acl_data_packets == 0:
+            # LE and Classic share the same values
+            self.hc_le_acl_data_packet_length     = self.hc_acl_data_packet_length
+            self.hc_total_num_le_acl_data_packets = self.hc_total_num_acl_data_packets
 
-            if (
-                response.return_parameters.hc_le_acl_data_packet_length == 0 or
-                response.return_parameters.hc_total_num_le_acl_data_packets == 0
-            ):
-                # LE and Classic share the same values
-                self.hc_le_acl_data_packet_length     = self.hc_acl_data_packet_length
-                self.hc_total_num_le_acl_data_packets = self.hc_total_num_acl_data_packets
+        logger.debug(
+            f'HCI ACL flow control: hc_acl_data_packet_length={self.hc_acl_data_packet_length},'
+            f'hc_total_num_acl_data_packets={self.hc_total_num_acl_data_packets}'
+        )
+        logger.debug(
+            f'HCI LE ACL flow control: hc_le_acl_data_packet_length={self.hc_le_acl_data_packet_length},'
+            f'hc_total_num_le_acl_data_packets={self.hc_total_num_le_acl_data_packets}'
+        )
 
         if (
             self.supports_command(HCI_LE_READ_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND) and

bumble/transport/usb.py

@@ -414,14 +414,13 @@ async def open_usb_transport(spec):
 
         device = found.open()
 
-        # Detach the kernel driver if supported and needed
+        # Auto-detach the kernel driver if supported
         if usb1.hasCapability(usb1.CAP_SUPPORTS_DETACH_KERNEL_DRIVER):
             try:
-                if device.kernelDriverActive(interface):
-                    logger.debug("detaching kernel driver")
-                    device.detachKernelDriver(interface)
-            except usb1.USBError:
-                pass
+                logger.debug('auto-detaching kernel driver')
+                device.setAutoDetachKernelDriver(True)
+            except usb1.USBError as error:
+                logger.warning(f'unable to auto-detach kernel driver: {error}')
 
         # Set the configuration if needed
         try: