422 lines
13 KiB
Python
422 lines
13 KiB
Python
#! /usr/bin/python3 -sP
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# SPDX-License-Identifier: GPL-2.0
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# -*- coding: utf-8 -*-
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#
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# Copyright (c) 2017 Benjamin Tissoires <benjamin.tissoires@gmail.com>
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# Copyright (c) 2017 Red Hat, Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import fcntl
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import functools
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import libevdev
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import os
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try:
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import pyudev
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except ImportError:
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raise ImportError("UHID is not supported due to missing pyudev dependency")
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import logging
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import hidtools.hid as hid
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from hidtools.uhid import UHIDDevice
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from hidtools.util import BusType
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from pathlib import Path
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from typing import Any, ClassVar, Dict, List, Optional, Tuple, Type, Union
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logger = logging.getLogger("hidtools.device.base_device")
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class SysfsFile(object):
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def __init__(self, path):
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self.path = path
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def __set_value(self, value):
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with open(self.path, "w") as f:
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return f.write(f"{value}\n")
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def __get_value(self):
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with open(self.path) as f:
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return f.read().strip()
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@property
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def int_value(self) -> int:
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return int(self.__get_value())
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@int_value.setter
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def int_value(self, v: int) -> None:
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self.__set_value(v)
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@property
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def str_value(self) -> str:
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return self.__get_value()
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@str_value.setter
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def str_value(self, v: str) -> None:
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self.__set_value(v)
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class LED(object):
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def __init__(self, sys_path):
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self.max_brightness = SysfsFile(sys_path / "max_brightness").int_value
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self.__brightness = SysfsFile(sys_path / "brightness")
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@property
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def brightness(self) -> int:
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return self.__brightness.int_value
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@brightness.setter
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def brightness(self, value: int) -> None:
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self.__brightness.int_value = value
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class PowerSupply(object):
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"""Represents Linux power_supply_class sysfs nodes."""
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def __init__(self, sys_path):
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self._capacity = SysfsFile(sys_path / "capacity")
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self._status = SysfsFile(sys_path / "status")
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self._type = SysfsFile(sys_path / "type")
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@property
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def capacity(self) -> int:
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return self._capacity.int_value
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@property
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def status(self) -> str:
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return self._status.str_value
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@property
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def type(self) -> str:
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return self._type.str_value
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class HIDIsReady(object):
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"""
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Companion class that binds to a kernel mechanism
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and that allows to know when a uhid device is ready or not.
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See :meth:`is_ready` for details.
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"""
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def __init__(self: "HIDIsReady", uhid: UHIDDevice) -> None:
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self.uhid = uhid
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def is_ready(self: "HIDIsReady") -> bool:
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"""
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Overwrite in subclasses: should return True or False whether
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the attached uhid device is ready or not.
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"""
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return False
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class UdevHIDIsReady(HIDIsReady):
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_pyudev_context: ClassVar[Optional[pyudev.Context]] = None
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_pyudev_monitor: ClassVar[Optional[pyudev.Monitor]] = None
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_uhid_devices: ClassVar[Dict[int, Tuple[bool, int]]] = {}
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def __init__(self: "UdevHIDIsReady", uhid: UHIDDevice) -> None:
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super().__init__(uhid)
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self._init_pyudev()
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@classmethod
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def _init_pyudev(cls: Type["UdevHIDIsReady"]) -> None:
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if cls._pyudev_context is None:
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cls._pyudev_context = pyudev.Context()
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cls._pyudev_monitor = pyudev.Monitor.from_netlink(cls._pyudev_context)
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cls._pyudev_monitor.filter_by("hid")
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cls._pyudev_monitor.start()
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UHIDDevice._append_fd_to_poll(
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cls._pyudev_monitor.fileno(), cls._cls_udev_event_callback
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)
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@classmethod
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def _cls_udev_event_callback(cls: Type["UdevHIDIsReady"]) -> None:
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if cls._pyudev_monitor is None:
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return
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event: pyudev.Device
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for event in iter(functools.partial(cls._pyudev_monitor.poll, 0.02), None):
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if event.action not in ["bind", "remove", "unbind"]:
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return
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logger.debug(f"udev event: {event.action} -> {event}")
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id = int(event.sys_path.strip().split(".")[-1], 16)
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device_ready, count = cls._uhid_devices.get(id, (False, 0))
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ready = event.action == "bind"
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if not device_ready and ready:
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count += 1
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cls._uhid_devices[id] = (ready, count)
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def is_ready(self: "UdevHIDIsReady") -> Tuple[bool, int]:
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try:
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return self._uhid_devices[self.uhid.hid_id]
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except KeyError:
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return (False, 0)
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class EvdevMatch(object):
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def __init__(
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self: "EvdevMatch",
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*,
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requires: List[Any] = [],
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excludes: List[Any] = [],
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req_properties: List[Any] = [],
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excl_properties: List[Any] = [],
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) -> None:
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self.requires = requires
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self.excludes = excludes
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self.req_properties = req_properties
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self.excl_properties = excl_properties
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def is_a_match(self: "EvdevMatch", evdev: libevdev.Device) -> bool:
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for m in self.requires:
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if not evdev.has(m):
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return False
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for m in self.excludes:
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if evdev.has(m):
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return False
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for p in self.req_properties:
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if not evdev.has_property(p):
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return False
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for p in self.excl_properties:
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if evdev.has_property(p):
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return False
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return True
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class EvdevDevice(object):
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"""
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Represents an Evdev node and its properties.
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This is a stub for the libevdev devices, as they are relying on
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uevent to get the data, saving us some ioctls to fetch the names
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and properties.
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"""
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def __init__(self: "EvdevDevice", sysfs: Path) -> None:
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self.sysfs = sysfs
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self.event_node: Any = None
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self.libevdev: Optional[libevdev.Device] = None
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self.uevents = {}
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# all of the interesting properties are stored in the input uevent, so in the parent
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# so convert the uevent file of the parent input node into a dict
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with open(sysfs.parent / "uevent") as f:
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for line in f.readlines():
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key, value = line.strip().split("=")
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self.uevents[key] = value.strip('"')
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# we open all evdev nodes in order to not miss any event
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self.open()
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@property
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def name(self: "EvdevDevice") -> str:
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assert "NAME" in self.uevents
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return self.uevents["NAME"]
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@property
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def evdev(self: "EvdevDevice") -> Path:
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return Path("/dev/input") / self.sysfs.name
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def matches_application(
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self: "EvdevDevice", application: str, matches: Dict[str, EvdevMatch]
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) -> bool:
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if self.libevdev is None:
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return False
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if application in matches:
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return matches[application].is_a_match(self.libevdev)
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logger.error(
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f"application '{application}' is unknown, please update/fix hid-tools"
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)
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assert False # hid-tools likely needs an update
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def open(self: "EvdevDevice") -> libevdev.Device:
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self.event_node = open(self.evdev, "rb")
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self.libevdev = libevdev.Device(self.event_node)
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assert self.libevdev.fd is not None
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fd = self.libevdev.fd.fileno()
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flag = fcntl.fcntl(fd, fcntl.F_GETFD)
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fcntl.fcntl(fd, fcntl.F_SETFL, flag | os.O_NONBLOCK)
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return self.libevdev
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def close(self: "EvdevDevice") -> None:
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if self.libevdev is not None and self.libevdev.fd is not None:
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self.libevdev.fd.close()
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self.libevdev = None
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if self.event_node is not None:
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self.event_node.close()
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self.event_node = None
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class BaseDevice(UHIDDevice):
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# default _application_matches that matches nothing. This needs
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# to be set in the subclasses to have get_evdev() working
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_application_matches: Dict[str, EvdevMatch] = {}
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def __init__(
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self,
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name,
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application,
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rdesc_str: Optional[str] = None,
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rdesc: Optional[Union[hid.ReportDescriptor, str, bytes]] = None,
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input_info=None,
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) -> None:
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self._kernel_is_ready: HIDIsReady = UdevHIDIsReady(self)
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if rdesc_str is None and rdesc is None:
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raise Exception("Please provide at least a rdesc or rdesc_str")
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super().__init__()
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if name is None:
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name = f"uhid gamepad test {self.__class__.__name__}"
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if input_info is None:
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input_info = (BusType.USB, 1, 2)
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self.name = name
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self.info = input_info
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self.default_reportID = None
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self.opened = False
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self.started = False
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self.application = application
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self._input_nodes: Optional[list[EvdevDevice]] = None
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if rdesc is None:
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assert rdesc_str is not None
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self.rdesc = hid.ReportDescriptor.from_human_descr(rdesc_str) # type: ignore
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else:
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self.rdesc = rdesc # type: ignore
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@property
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def power_supply_class(self: "BaseDevice") -> Optional[PowerSupply]:
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ps = self.walk_sysfs("power_supply", "power_supply/*")
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if ps is None or len(ps) < 1:
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return None
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return PowerSupply(ps[0])
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@property
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def led_classes(self: "BaseDevice") -> List[LED]:
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leds = self.walk_sysfs("led", "**/max_brightness")
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if leds is None:
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return []
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return [LED(led.parent) for led in leds]
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@property
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def kernel_is_ready(self: "BaseDevice") -> bool:
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return self._kernel_is_ready.is_ready()[0] and self.started
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@property
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def kernel_ready_count(self: "BaseDevice") -> int:
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return self._kernel_is_ready.is_ready()[1]
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@property
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def input_nodes(self: "BaseDevice") -> List[EvdevDevice]:
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if self._input_nodes is not None:
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return self._input_nodes
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if not self.kernel_is_ready or not self.started:
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return []
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self._input_nodes = [
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EvdevDevice(path)
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for path in self.walk_sysfs("input", "input/input*/event*")
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]
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return self._input_nodes
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def match_evdev_rule(self, application, evdev):
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"""Replace this in subclasses if the device has multiple reports
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of the same type and we need to filter based on the actual evdev
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node.
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returning True will append the corresponding report to
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`self.input_nodes[type]`
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returning False will ignore this report / type combination
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for the device.
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"""
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return True
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def open(self):
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self.opened = True
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def _close_all_opened_evdev(self):
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if self._input_nodes is not None:
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for e in self._input_nodes:
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e.close()
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def __del__(self):
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self._close_all_opened_evdev()
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def close(self):
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self.opened = False
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def start(self, flags):
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self.started = True
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def stop(self):
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self.started = False
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self._close_all_opened_evdev()
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def next_sync_events(self, application=None):
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evdev = self.get_evdev(application)
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if evdev is not None:
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return list(evdev.events())
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return []
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@property
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def application_matches(self: "BaseDevice") -> Dict[str, EvdevMatch]:
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return self._application_matches
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@application_matches.setter
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def application_matches(self: "BaseDevice", data: Dict[str, EvdevMatch]) -> None:
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self._application_matches = data
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def get_evdev(self, application=None):
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if application is None:
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application = self.application
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if len(self.input_nodes) == 0:
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return None
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assert self._input_nodes is not None
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if len(self._input_nodes) == 1:
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evdev = self._input_nodes[0]
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if self.match_evdev_rule(application, evdev.libevdev):
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return evdev.libevdev
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else:
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for _evdev in self._input_nodes:
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if _evdev.matches_application(application, self.application_matches):
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if self.match_evdev_rule(application, _evdev.libevdev):
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return _evdev.libevdev
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def is_ready(self):
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"""Returns whether a UHID device is ready. Can be overwritten in
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subclasses to add extra conditions on when to consider a UHID
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device ready. This can be:
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- we need to wait on different types of input devices to be ready
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(Touch Screen and Pen for example)
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- we need to have at least 4 LEDs present
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(len(self.uhdev.leds_classes) == 4)
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- or any other combinations"""
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return self.kernel_is_ready
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