improved otgbind

kvmd/apps/kvmd/__init__.py

@@ -86,7 +86,7 @@ def main(argv: Optional[List[str]]=None) -> None:
         ),
         info_manager=InfoManager(global_config),
         log_reader=LogReader(),
-        user_gpio=UserGpio(config.gpio, global_config.otg.udc),
+        user_gpio=UserGpio(config.gpio, global_config.otg.udc, global_config.otg.gadget),
         ocr=TesseractOcr(**config.ocr._unpack()),
 
         hid=hid,

kvmd/apps/kvmd/ugpio.py

@@ -231,7 +231,7 @@ class _GpioOutput:  # pylint: disable=too-many-instance-attributes
 
 # =====
 class UserGpio:
-    def __init__(self, config: Section, udc: str) -> None:
+    def __init__(self, config: Section, udc: str, gadget: str) -> None:
         self.__view = config.view
 
         self.__notifier = aiotools.AioNotifier()
@@ -241,7 +241,7 @@ class UserGpio:
                 instance_name=driver,
                 notifier=self.__notifier,
                 **drv_config._unpack(ignore=["instance_name", "notifier", "type"]),
-                **({"udc": udc} if drv_config.type == "otgbind" else {}),  # Hack
+                **({"udc": udc, "gadget": gadget} if drv_config.type == "otgbind" else {}),  # Hack
             )
             for (driver, drv_config) in tools.sorted_kvs(config.drivers)
         }

kvmd/apps/otg/__init__.py

@@ -186,7 +186,7 @@ def _cmd_start(config: Section) -> None:  # pylint: disable=too-many-statements
 
     _check_config(config)
 
-    (udc, usb_driver) = usb.find_udc(config.otg.udc)
+    udc = usb.find_udc(config.otg.udc)[0]
     logger.info("Using UDC %s", udc)
 
     logger.info("Creating gadget %r ...", config.otg.gadget)
@@ -258,10 +258,8 @@ def _cmd_start(config: Section) -> None:  # pylint: disable=too-many-statements
     _write(join(gadget_path, "UDC"), udc)
     time.sleep(config.otg.init_delay)
 
-    logger.info("Setting %s bind permissions ...", usb_driver)
-    driver_path = f"{env.SYSFS_PREFIX}/sys/bus/platform/drivers/{usb_driver}"
-    _chown(join(driver_path, "bind"), config.otg.user)
-    _chown(join(driver_path, "unbind"), config.otg.user)
+    logger.info("Setting UDC permissions ...")
+    _chown(join(gadget_path, "UDC"), config.otg.user)
 
     logger.info("Ready to work")
 
@@ -277,7 +275,7 @@ def _cmd_stop(config: Section) -> None:
     gadget_path = join(f"{env.SYSFS_PREFIX}/sys/kernel/config/usb_gadget", config.otg.gadget)
 
     logger.info("Disabling gadget %r ...", config.otg.gadget)
-    _write(join(gadget_path, "UDC"), "")
+    _write(join(gadget_path, "UDC"), "\n")
 
     _unlink(join(gadget_path, "os_desc/c.1"), True)
 

kvmd/plugins/ugpio/otgbind.py

@@ -46,19 +46,21 @@ class Plugin(BaseUserGpioDriver):
         notifier: aiotools.AioNotifier,
 
         udc: str,  # XXX: Not from options, see /kvmd/apps/kvmd/__init__.py for details
+        gadget: str,  # ditto
     ) -> None:
 
         super().__init__(instance_name, notifier)
 
         self.__udc = udc
-        self.__driver = ""
+
+        self.__ctl_path = f"{env.SYSFS_PREFIX}/sys/kernel/config/usb_gadget/{gadget}/UDC"
 
     @classmethod
     def get_pin_validator(cls) -> Callable[[Any], Any]:
         return str
 
     def prepare(self) -> None:
-        (self.__udc, self.__driver) = usb.find_udc(self.__udc)
+        self.__udc = usb.find_udc(self.__udc)[0]
         get_logger().info("Using UDC %s", self.__udc)
 
     async def run(self) -> None:
@@ -67,12 +69,12 @@ class Plugin(BaseUserGpioDriver):
             try:
                 while True:
                     await self._notifier.notify()
-                    if os.path.isdir(self.__get_driver_path()):
+                    if os.path.isfile(self.__ctl_path):
                         break
                     await asyncio.sleep(5)
 
                 with Inotify() as inotify:
-                    inotify.watch(self.__get_driver_path(), InotifyMask.ALL_MODIFY_EVENTS)
+                    inotify.watch(os.path.dirname(self.__ctl_path), InotifyMask.ALL_MODIFY_EVENTS)
                     await self._notifier.notify()
                     while True:
                         need_restart = False
@@ -90,19 +92,19 @@ class Plugin(BaseUserGpioDriver):
             except Exception:
                 logger.exception("Unexpected OTG-bind watcher error")
 
+    async def cleanup(self) -> None:
+        with open(self.__ctl_path) as ctl_file:
+            ctl_file.write(self.__udc)
+
     async def read(self, pin: str) -> bool:
         _ = pin
-        return os.path.islink(self.__get_driver_path(self.__udc))
+        with open(self.__ctl_path) as ctl_file:
+            return bool(ctl_file.read().strip())
 
     async def write(self, pin: str, state: bool) -> None:
         _ = pin
-        with open(self.__get_driver_path("bind" if state else "unbind"), "w") as ctl_file:
-            ctl_file.write(f"{self.__udc}\n")
-
-    def __get_driver_path(self, name: str="") -> str:
-        assert self.__driver
-        path = f"{env.SYSFS_PREFIX}/sys/bus/platform/drivers/{self.__driver}"
-        return (os.path.join(path, name) if name else path)
+        with open(self.__ctl_path, "w") as ctl_file:
+            ctl_file.write(self.__udc if state else "\n")
 
     def __str__(self) -> str:
         return f"GPIO({self._instance_name})"