1 files changed, 71 insertions, 0 deletions
diff --git a/kvmd/plugins/hid/_mcu/gpio.py b/kvmd/plugins/hid/_mcu/gpio.py
new file mode 100644
index 00000000..830819f0
--- /dev/null
+++ b/kvmd/plugins/hid/_mcu/gpio.py
@@ -0,0 +1,71 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main Pi-KVM daemon.                                          #
+#                                                                            #
+#    Copyright (C) 2018  Maxim Devaev <[email protected]>                    #
+#                                                                            #
+#    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/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+from typing import Optional
+
+import gpiod
+
+from ....logging import get_logger
+
+from .... import env
+from .... import aiotools
+from .... import aiogp
+
+
+# =====
+class Gpio:
+    def __init__(self, reset_pin: int, reset_delay: float) -> None:
+        self.__reset_pin = reset_pin
+        self.__reset_delay = reset_delay
+
+        self.__chip: Optional[gpiod.Chip] = None
+        self.__reset_line: Optional[gpiod.Line] = None
+        self.__reset_wip = False
+
+    def open(self) -> None:
+        if self.__reset_pin >= 0:
+            assert self.__chip is None
+            assert self.__reset_line is None
+            self.__chip = gpiod.Chip(env.GPIO_DEVICE_PATH)
+            self.__reset_line = self.__chip.get_line(self.__reset_pin)
+            self.__reset_line.request("kvmd::hid-mcu::reset", gpiod.LINE_REQ_DIR_OUT, default_vals=[0])
+
+    def close(self) -> None:
+        if self.__chip:
+            try:
+                self.__chip.close()
+            except Exception:
+                pass
+
+    @aiotools.atomic
+    async def reset(self) -> None:
+        if self.__reset_pin >= 0:
+            assert self.__reset_line
+            if not self.__reset_wip:
+                self.__reset_wip = True
+                try:
+                    await aiogp.pulse(self.__reset_line, self.__reset_delay, 1)
+                finally:
+                    self.__reset_wip = False
+                get_logger(0).info("Reset HID performed")
+            else:
+                get_logger(0).info("Another reset HID in progress")