unified udc code and automatic driver detection

kvmd/plugins/hid/otg/__init__.py

@@ -28,6 +28,7 @@ from typing import Optional
 from typing import Any
 
 from .... import aiomulti
+from .... import usb
 
 from ....yamlconf import Option
 
@@ -38,7 +39,6 @@ from ....validators.os import valid_abs_path
 
 from .. import BaseHid
 
-from .usb import UsbDeviceController
 from .keyboard import KeyboardProcess
 from .mouse import MouseProcess
 
@@ -56,7 +56,7 @@ class Plugin(BaseHid):  # pylint: disable=too-many-instance-attributes
 
         self.__notifier = aiomulti.AioProcessNotifier()
 
-        self.__udc = UsbDeviceController(udc)
+        self.__udc = usb.UsbDeviceController(udc)
 
         win98_fix = mouse.pop("absolute_win98_fix")
         common = {

kvmd/plugins/hid/otg/device.py

@@ -35,8 +35,8 @@ from ....logging import get_logger
 from .... import tools
 from .... import aiomulti
 from .... import aioproc
+from .... import usb
 
-from .usb import UsbDeviceController
 from .events import BaseEvent
 
 
@@ -49,7 +49,7 @@ class BaseDeviceProcess(multiprocessing.Process):  # pylint: disable=too-many-in
         initial_state: Dict,
         notifier: aiomulti.AioProcessNotifier,
 
-        udc: UsbDeviceController,
+        udc: usb.UsbDeviceController,
 
         device_path: str,
         select_timeout: float,
@@ -89,6 +89,12 @@ class BaseDeviceProcess(multiprocessing.Process):  # pylint: disable=too-many-in
                     try:
                         event = self.__events_queue.get(timeout=self.__queue_timeout)
                     except queue.Empty:
+                        # Проблема в том, что устройство может отвечать EAGAIN или ESHUTDOWN,
+                        # если оно было отключено физически. См:
+                        #    - https://github.com/raspberrypi/linux/issues/3870
+                        #    - https://github.com/raspberrypi/linux/pull/3151
+                        # Так что нам нужно проверять состояние контроллера, чтобы не спамить
+                        # в устройство и отслеживать его состояние.
                         if not self.__udc.can_operate():
                             self.__state_flags.update(online=False)
                     else:

kvmd/plugins/hid/otg/usb.py

@@ -1,77 +0,0 @@
-# ========================================================================== #
-#                                                                            #
-#    KVMD - The main Pi-KVM daemon.                                          #
-#                                                                            #
-#    Copyright (C) 2018-2021  Maxim Devaev <mdevaev@gmail.com>               #
-#                                                                            #
-#    This program is free software: you can redistribute it and/or modify    #
-#    it under the terms of the GNU General Public License as published by    #
-#    the Free Software Foundation, either version 3 of the License, or       #
-#    (at your option) any later version.                                     #
-#                                                                            #
-#    This program is distributed in the hope that it will be useful,         #
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
-#    GNU General Public License for more details.                            #
-#                                                                            #
-#    You should have received a copy of the GNU General Public License       #
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
-#                                                                            #
-# ========================================================================== #
-
-
-import os
-
-from ....logging import get_logger
-
-from .... import env
-from .... import tools
-
-
-# =====
-class UsbDeviceController:
-    # Проблема в том, что устройство может отвечать EAGAIN или ESHUTDOWN,
-    # если оно было отключено физически. См:
-    #    - https://github.com/raspberrypi/linux/issues/3870
-    #    - https://github.com/raspberrypi/linux/pull/3151
-    # Так что нам нужно проверять состояние контроллера, чтобы не спамить
-    # в устройство и отслеживать его состояние.
-
-    def __init__(self, udc: str) -> None:
-        self.__udc = udc
-        self.__state_path = ""
-
-    def find(self) -> None:
-        logger = get_logger()
-
-        path = f"{env.SYSFS_PREFIX}/sys/class/udc"
-        try:
-            candidates = sorted(os.listdir(path))
-        except Exception as err:
-            logger.error("Can't list %s: %s: ignored", path, tools.efmt(err))
-            return
-
-        udc = ""
-        if not self.__udc:
-            if len(candidates) == 0:
-                logger.error("Can't find any UDC: ignored")
-            else:
-                udc = candidates[0]
-        elif self.__udc not in candidates:
-            logger.error("Can't find selected UDC: %s: ignored", self.__udc)
-        else:
-            udc = self.__udc
-
-        if udc:
-            get_logger().info("Using UDC %s", udc)
-            self.__state_path = os.path.join(path, udc, "state")
-
-    def can_operate(self) -> bool:
-        if self.__state_path:
-            try:
-                with open(self.__state_path, "r") as state_file:
-                    # https://www.maxlinear.com/Files/Documents/an213_033111.pdf
-                    return (state_file.read().strip().lower() == "configured")
-            except Exception:
-                pass
-        return True  # При ошибке лучше прикинуться работающим, мало ли что