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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018-2021 Maxim Devaev <[email protected]> #
# Shantur Rathore <[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 periphery import PWM
from typing import Dict
from typing import Optional
from typing import Set
from ...logging import get_logger
from ... import tools
from ... import aiotools
from ...yamlconf import Option
from ...validators.basic import valid_int_f0
from . import GpioDriverOfflineError
from . import UserGpioModes
from . import BaseUserGpioDriver
# =====
class Plugin(BaseUserGpioDriver):
def __init__( # pylint: disable=super-init-not-called
self,
instance_name: str,
notifier: aiotools.AioNotifier,
pwm_chip: int,
pwm_period: int,
duty_cycle_push: int,
duty_cycle_release: int,
) -> None:
super().__init__(instance_name, notifier)
self.__pwm_chip = pwm_chip
self.__pwm_period = pwm_period
self.__duty_cycle_push = duty_cycle_push
self.__duty_cycle_release = duty_cycle_release
self.__channels: Dict[int, Optional[bool]] = {}
self.__channel_pwm: Dict[int, PWM] = {}
@classmethod
def get_plugin_options(cls) -> Dict:
return {
"pwm_chip": Option(0, type=valid_int_f0),
"pwm_period": Option(20000000, type=valid_int_f0),
"duty_cycle_push": Option(1500000, type=valid_int_f0),
"duty_cycle_release": Option(1000000, type=valid_int_f0),
}
@classmethod
def get_modes(cls) -> Set[str]:
return set([UserGpioModes.OUTPUT])
def register_input(self, pin: int, debounce: float) -> None:
raise RuntimeError(f"Unsupported mode 'input' for pin={pin} on {self}")
def register_output(self, pin: int, initial: Optional[bool]) -> None:
self.__channels[pin] = initial
def prepare(self) -> None:
logger = get_logger(0)
for (pin, initial) in self.__channels.items():
try:
logger.info("Probing pwm chip %d channel %d ...", self.__pwm_chip, pin)
pwm = PWM(self.__pwm_chip, pin)
self.__channel_pwm[pin] = pwm
pwm.period_ns = self.__pwm_period
pwm.duty_cycle_ns = self.__duty_cycle_push if initial else self.__duty_cycle_release
pwm.enable()
except Exception as err:
logger.error("Can't get pwm chip %d channel %d: %s",
self.__pwm_chip, pin, tools.efmt(err))
async def run(self) -> None:
await aiotools.wait_infinite()
async def cleanup(self) -> None:
for (pin, _) in self.__channels.items():
self.__channel_pwm[pin].disable()
self.__channel_pwm[pin].close()
async def read(self, pin: int) -> bool:
try:
return self.__channel_pwm[pin].duty_cycle_ns == self.__duty_cycle_push
except Exception:
raise GpioDriverOfflineError(self)
async def write(self, pin: int, state: bool) -> None:
try:
self.__channel_pwm[pin].duty_cycle_ns = self.__duty_cycle_push if state else self.__duty_cycle_release
except Exception:
raise GpioDriverOfflineError(self)
def __str__(self) -> str:
return f"PWM({self._instance_name})"
__repr__ = __str__
|
