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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 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/>. #
# #
# ========================================================================== #
import asyncio
import contextlib
import functools
from typing import Callable
from typing import Any
import hid
from ...logging import get_logger
from ... import tools
from ... import aiotools
from ...yamlconf import Option
from ...validators.basic import valid_number
from ...validators.basic import valid_float_f01
from ...validators.os import valid_abs_path
from . import GpioDriverOfflineError
from . import UserGpioModes
from . import BaseUserGpioDriver
# =====
class Plugin(BaseUserGpioDriver):
# http://vusb.wikidot.com/project:driver-less-usb-relays-hid-interface
# https://github.com/trezor/cython-hidapi/blob/6057d41b5a2552a70ff7117a9d19fc21bf863867/chid.pxd
def __init__( # pylint: disable=super-init-not-called
self,
instance_name: str,
notifier: aiotools.AioNotifier,
device_path: str,
state_poll: float,
) -> None:
super().__init__(instance_name, notifier)
self.__device_path = device_path
self.__state_poll = state_poll
self.__device: (hid.device | None) = None
self.__stop = False
self.__initials: dict[int, (bool | None)] = {}
@classmethod
def get_plugin_options(cls) -> dict:
return {
"device": Option("", type=valid_abs_path, unpack_as="device_path"),
"state_poll": Option(5.0, type=valid_float_f01),
}
@classmethod
def get_modes(cls) -> set[str]:
return set([UserGpioModes.OUTPUT])
@classmethod
def get_pin_validator(cls) -> Callable[[Any], Any]:
return functools.partial(valid_number, min=0, max=7, name="HID relay channel")
def register_output(self, pin: str, initial: (bool | None)) -> None:
self.__initials[int(pin)] = initial
def prepare(self) -> None:
logger = get_logger(0)
logger.info("Probing driver %s on %s ...", self, self.__device_path)
try:
with self.__ensure_device("probing"):
pass
except Exception as err:
logger.error("Can't probe %s on %s: %s",
self, self.__device_path, tools.efmt(err))
self.__reset_pins()
async def run(self) -> None:
prev_raw = -1
while True:
try:
raw = self.__inner_read_raw()
except Exception:
raw = -1
if raw != prev_raw:
self._notifier.notify()
prev_raw = raw
await asyncio.sleep(self.__state_poll)
async def cleanup(self) -> None:
self.__reset_pins()
self.__close_device()
self.__stop = True
async def read(self, pin: str) -> bool:
try:
return self.__inner_read(int(pin))
except Exception:
raise GpioDriverOfflineError(self)
async def write(self, pin: str, state: bool) -> None:
try:
return self.__inner_write(int(pin), state)
except Exception:
raise GpioDriverOfflineError(self)
# =====
def __reset_pins(self) -> None:
logger = get_logger(0)
for (pin, state) in self.__initials.items():
if state is not None:
logger.info("Resetting pin=%d to state=%d of %s on %s: ...",
pin, state, self, self.__device_path)
try:
self.__inner_write(pin, state)
except Exception as err:
logger.error("Can't reset pin=%d of %s on %s: %s",
pin, self, self.__device_path, tools.efmt(err))
def __inner_read(self, pin: int) -> bool:
assert 0 <= pin <= 7
return bool(self.__inner_read_raw() & (1 << pin))
def __inner_read_raw(self) -> int:
with self.__ensure_device("reading") as device:
return device.get_feature_report(1, 8)[7]
def __inner_write(self, pin: int, state: bool) -> None:
assert 0 <= pin <= 7
with self.__ensure_device("writing") as device:
report = [(0xFF if state else 0xFD), pin + 1] # Pin numeration starts from 0
result = device.send_feature_report(report)
if result < 0:
raise RuntimeError(f"Retval of send_feature_report() < 0: {result}")
@contextlib.contextmanager
def __ensure_device(self, context: str) -> hid.device:
assert not self.__stop
if self.__device is None:
device = hid.device()
device.open_path(self.__device_path.encode("utf-8"))
device.set_nonblocking(True)
self.__device = device
get_logger(0).info("Opened %s on %s while %s", self, self.__device_path, context)
try:
yield self.__device
except Exception as err:
get_logger(0).error("Error occured on %s on %s while %s: %s",
self, self.__device_path, context, tools.efmt(err))
self.__close_device()
raise
def __close_device(self) -> None:
if self.__device:
try:
self.__device.close()
except Exception:
pass
self.__device = None
get_logger(0).info("Closed %s on %s", self, self.__device_path)
def __str__(self) -> str:
return f"HidRelay({self._instance_name})"
__repr__ = __str__
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