405 lines
13 KiB
Python
405 lines
13 KiB
Python
# -*- python-mode -*-
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# -*- coding: UTF-8 -*-
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## Copyright (C) 2012-2013 Daniel Pavel
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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 along
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## with this program; if not, write to the Free Software Foundation, Inc.,
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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from __future__ import absolute_import, division, print_function, unicode_literals
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from logging import getLogger, DEBUG as _DEBUG
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_log = getLogger(__name__)
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del getLogger
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from copy import copy as _copy
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import math
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from .common import (
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NamedInt as _NamedInt,
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NamedInts as _NamedInts,
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bytes2int as _bytes2int,
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int2bytes as _int2bytes,
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)
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#
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#
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#
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KIND = _NamedInts(toggle=0x01, choice=0x02, range=0x04)
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class Setting(object):
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"""A setting descriptor.
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Needs to be instantiated for each specific device."""
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__slots__ = ('name', 'label', 'description', 'kind', 'device_kind',
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'_rw', '_validator', '_device', '_value')
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def __init__(self, name, rw, validator, kind=None, label=None, description=None, device_kind=None):
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assert name
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self.name = name
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self.label = label or name
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self.description = description
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self.device_kind = device_kind
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self._rw = rw
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self._validator = validator
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assert kind is None or kind & validator.kind != 0
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self.kind = kind or validator.kind
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def __call__(self, device):
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assert not hasattr(self, '_value')
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assert self.device_kind is None or device.kind in self.device_kind
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p = device.protocol
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if p == 1.0:
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# HID++ 1.0 devices do not support features
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assert self._rw.kind == RegisterRW.kind
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elif p >= 2.0:
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# HID++ 2.0 devices do not support registers
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assert self._rw.kind == FeatureRW.kind
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o = _copy(self)
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o._value = None
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o._device = device
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return o
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@property
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def choices(self):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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return self._validator.choices if self._validator.kind & KIND.choice else None
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@property
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def range(self):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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if self._validator.kind == KIND.range:
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return (self._validator.min_value, self._validator.max_value)
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def read(self, cached=True):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings read %r from %s", self.name, self._value, self._device)
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if self._value is None and self._device.persister:
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# We haven't read a value from the device yet,
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# maybe we have something in the configuration.
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self._value = self._device.persister.get(self.name)
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if cached and self._value is not None:
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if self._device.persister and self.name not in self._device.persister:
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# If this is a new device (or a new setting for an old device),
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# make sure to save its current value for the next time.
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self._device.persister[self.name] = self._value
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return self._value
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if self._device.online:
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reply = self._rw.read(self._device)
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if reply:
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self._value = self._validator.validate_read(reply)
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if self._device.persister and self.name not in self._device.persister:
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# Don't update the persister if it already has a value,
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# otherwise the first read might overwrite the value we wanted.
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self._device.persister[self.name] = self._value
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return self._value
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def write(self, value):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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assert value is not None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings write %r to %s", self.name, value, self._device)
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if self._device.online:
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# Remember the value we're trying to set, even if the write fails.
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# This way even if the device is offline or some other error occurs,
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# the last value we've tried to write is remembered in the configuration.
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self._value = value
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if self._device.persister:
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self._device.persister[self.name] = value
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current_value = None
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if self._validator.needs_current_value:
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# the validator needs the current value, possibly to merge flag values
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current_value = self._rw.read(self._device)
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data_bytes = self._validator.prepare_write(value, current_value)
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if data_bytes is not None:
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings prepare write(%s) => %r", self.name, value, data_bytes)
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reply = self._rw.write(self._device, data_bytes)
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if not reply:
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# tell whomever is calling that the write failed
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return None
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return value
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def apply(self):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: apply %s (%s)", self.name, self._value, self._device)
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value = self.read()
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if value is not None:
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self.write(value)
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def __str__(self):
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if hasattr(self, '_value'):
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assert hasattr(self, '_device')
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return '<Setting([%s:%s] %s:%s=%s)>' % (self._rw.kind, self._validator.kind, self._device.codename, self.name, self._value)
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return '<Setting([%s:%s] %s)>' % (self._rw.kind, self._validator.kind, self.name)
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__unicode__ = __repr__ = __str__
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#
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# read/write low-level operators
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#
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class RegisterRW(object):
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__slots__ = ('register', )
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kind = _NamedInt(0x01, 'register')
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def __init__(self, register):
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assert isinstance(register, int)
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self.register = register
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def read(self, device):
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return device.read_register(self.register)
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def write(self, device, data_bytes):
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return device.write_register(self.register, data_bytes)
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class FeatureRW(object):
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__slots__ = ('feature', 'read_fnid', 'write_fnid')
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kind = _NamedInt(0x02, 'feature')
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default_read_fnid = 0x00
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default_write_fnid = 0x10
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def __init__(self, feature, read_fnid=default_read_fnid, write_fnid=default_write_fnid):
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assert isinstance(feature, _NamedInt)
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self.feature = feature
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self.read_fnid = read_fnid
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self.write_fnid = write_fnid
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def read(self, device):
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assert self.feature is not None
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return device.feature_request(self.feature, self.read_fnid)
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def write(self, device, data_bytes):
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assert self.feature is not None
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return device.feature_request(self.feature, self.write_fnid, data_bytes)
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#
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# value validators
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# handle the conversion from read bytes, to setting value, and back
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#
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class BooleanValidator(object):
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__slots__ = ('true_value', 'false_value', 'mask', 'needs_current_value')
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kind = KIND.toggle
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default_true = 0x01
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default_false = 0x00
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# mask specifies all the affected bits in the value
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default_mask = 0xFF
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def __init__(self, true_value=default_true, false_value=default_false, mask=default_mask):
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if isinstance(true_value, int):
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assert isinstance(false_value, int)
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if mask is None:
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mask = self.default_mask
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else:
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assert isinstance(mask, int)
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assert true_value & false_value == 0
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assert true_value & mask == true_value
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assert false_value & mask == false_value
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self.needs_current_value = (mask != self.default_mask)
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elif isinstance(true_value, bytes):
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if false_value is None or false_value == self.default_false:
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false_value = b'\x00' * len(true_value)
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else:
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assert isinstance(false_value, bytes)
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if mask is None or mask == self.default_mask:
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mask = b'\xFF' * len(true_value)
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else:
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assert isinstance(mask, bytes)
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assert len(mask) == len(true_value) == len(false_value)
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tv = _bytes2int(true_value)
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fv = _bytes2int(false_value)
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mv = _bytes2int(mask)
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assert tv & fv == 0
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assert tv & mv == tv
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assert fv & mv == fv
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self.needs_current_value = any(m != b'\xFF' for m in mask)
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else:
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raise Exception("invalid mask '%r', type %s" % (mask, type(mask)))
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self.true_value = true_value
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self.false_value = false_value
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self.mask = mask
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def validate_read(self, reply_bytes):
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if isinstance(self.mask, int):
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reply_value = ord(reply_bytes[:1]) & self.mask
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if _log.isEnabledFor(_DEBUG):
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_log.debug("BooleanValidator: validate read %r => %02X", reply_bytes, reply_value)
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if reply_value == self.true_value:
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return True
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if reply_value == self.false_value:
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return False
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_log.warn("BooleanValidator: reply %02X mismatched %02X/%02X/%02X",
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reply_value, self.true_value, self.false_value, self.mask)
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return False
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count = len(self.mask)
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mask = _bytes2int(self.mask)
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reply_value = _bytes2int(reply_bytes[:count]) & mask
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true_value = _bytes2int(self.true_value)
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if reply_value == true_value:
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return True
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false_value = _bytes2int(self.false_value)
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if reply_value == false_value:
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return False
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_log.warn("BooleanValidator: reply %r mismatched %r/%r/%r",
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reply_bytes, self.true_value, self.false_value, self.mask)
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return False
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def prepare_write(self, new_value, current_value=None):
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if new_value is None:
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new_value = False
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else:
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assert isinstance(new_value, bool)
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to_write = self.true_value if new_value else self.false_value
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if isinstance(self.mask, int):
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if current_value is not None and self.needs_current_value:
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to_write |= ord(current_value[:1]) & (0xFF ^ self.mask)
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if current_value is not None and to_write == ord(current_value[:1]):
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return None
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else:
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to_write = bytearray(to_write)
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count = len(self.mask)
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for i in range(0, count):
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b = ord(to_write[i:i+1])
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m = ord(self.mask[i : i + 1])
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assert b & m == b
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# b &= m
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if current_value is not None and self.needs_current_value:
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b |= ord(current_value[i : i + 1]) & (0xFF ^ m)
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to_write[i] = b
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to_write = bytes(to_write)
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if current_value is not None and to_write == current_value[:len(to_write)]:
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return None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("BooleanValidator: prepare_write(%s, %s) => %r", new_value, current_value, to_write)
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return to_write
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class ChoicesValidator(object):
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__slots__ = ('choices', 'flag', '_bytes_count', 'needs_current_value')
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kind = KIND.choice
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"""Translates between NamedInts and a byte sequence.
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:param choices: a list of NamedInts
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:param bytes_count: the size of the derived byte sequence. If None, it
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will be calculated from the choices."""
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def __init__(self, choices, bytes_count=None):
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assert choices is not None
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assert isinstance(choices, _NamedInts)
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assert len(choices) > 2
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self.choices = choices
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self.needs_current_value = False
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max_bits = max(x.bit_length() for x in choices)
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self._bytes_count = (max_bits // 8) + (1 if max_bits % 8 else 0)
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if bytes_count:
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assert self._bytes_count <= bytes_count
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self._bytes_count = bytes_count
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assert self._bytes_count < 8
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def validate_read(self, reply_bytes):
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reply_value = _bytes2int(reply_bytes[:self._bytes_count])
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valid_value = self.choices[reply_value]
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assert valid_value is not None, "%s: failed to validate read value %02X" % (self.__class__.__name__, reply_value)
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return valid_value
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def prepare_write(self, new_value, current_value=None):
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if new_value is None:
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choice = self.choices[:][0]
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else:
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if isinstance(new_value, int):
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choice = self.choices[new_value]
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elif int(new_value) in self.choices:
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choice = self.choices[int(new_value)]
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elif new_value in self.choices:
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choice = self.choices[new_value]
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else:
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raise ValueError(new_value)
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if choice is None:
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raise ValueError("invalid choice %r" % new_value)
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assert isinstance(choice, _NamedInt)
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return choice.bytes(self._bytes_count)
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class RangeValidator(object):
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__slots__ = ('min_value', 'max_value', 'flag', '_bytes_count', 'needs_current_value')
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kind = KIND.range
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"""Translates between integers and a byte sequence.
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:param min_value: minimum accepted value (inclusive)
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:param max_value: maximum accepted value (inclusive)
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:param bytes_count: the size of the derived byte sequence. If None, it
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will be calculated from the range."""
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def __init__(self, min_value, max_value, bytes_count=None):
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assert max_value > min_value
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self.min_value = min_value
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self.max_value = max_value
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self.needs_current_value = False
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self._bytes_count = math.ceil(math.log(max_value + 1, 256))
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if bytes_count:
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assert self._bytes_count <= bytes_count
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self._bytes_count = bytes_count
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assert self._bytes_count < 8
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def validate_read(self, reply_bytes):
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reply_value = _bytes2int(reply_bytes[:self._bytes_count])
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assert reply_value >= self.min_value, "%s: failed to validate read value %02X" % (self.__class__.__name__, reply_value)
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assert reply_value <= self.max_value, "%s: failed to validate read value %02X" % (self.__class__.__name__, reply_value)
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return reply_value
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def prepare_write(self, new_value, current_value=None):
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if new_value < self.min_value or new_value > self.max_value:
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raise ValueError("invalid choice %r" % new_value)
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return _int2bytes(new_value, self._bytes_count)
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