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uinput.py
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270 lines (209 loc) · 8.92 KB
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# encoding: utf-8
import os
import stat
import time
import ctypes
import select
from evdev import _uinput, _input, ff
from evdev import ecodes, util, device, InputEvent
class UInputError(Exception):
pass
class uinput_ff_upload(ctypes.Structure):
_fields_ = [
('request_id', ff._u32),
('retval', ff._s32),
('effect', ff.Effect),
('old', ff.Effect),
]
class uinput_ff_erase(ctypes.Structure):
_fields_ = [
('request_id', ff._u32),
('retval', ff._s32),
('effect_id', ff._u32)
]
class UInput(object):
'''
A userland input device and that can inject input events into the
linux input subsystem.
'''
__slots__ = (
'name', 'vendor', 'product', 'version', 'bustype',
'events', 'devnode', 'fd', 'device', 'ff_effects_max',
'ff_effects', 'ff_callback',
)
def __init__(self,
events=None,
name='py-evdev-uinput',
vendor=0x1, product=0x1, version=0x1, bustype=0x3,
devnode='/dev/uinput', ff_effects_max=0, ff_callback=None):
'''
:param events: the event types and codes that the uinput
device will be able to inject - defaults to all
key codes.
:type events: dictionary of event types mapping to lists of
event codes.
:param name: the name of the input device.
:param vendor: vendor identifier.
:param product: product identifier.
:param version: version identifier.
:param bustype: bustype identifier.
:param ff_effects_max: number of force-feedback effects that
can be kept in memory
.. note:: If you do not specify any events, the uinput device
will be able to inject only ``KEY_*`` and ``BTN_*``
event codes.
'''
self.name = name #: Uinput device name.
self.vendor = vendor #: Device vendor identifier.
self.product = product #: Device product identifier.
self.version = version #: Device version identifier.
self.bustype = bustype #: Device bustype - eg. ``BUS_USB``.
self.devnode = devnode #: Uinput device node - eg. ``/dev/uinput/``.
#: The number of force feedback effects the device can keep in its memory.
self.ff_effects_max = ff_effects_max
self.ff_effects = []
self.ff_callback = ff_callback
if ecodes.EV_FF in events and ff_effects_max < 1:
msg = 'EV_FF capabilities specified without setting ff_effects_max'
raise UInputError(msg)
if not events:
events = {ecodes.EV_KEY: ecodes.keys.keys()}
# the min, max, fuzz and flat values for the absolute axis for
# a given code
absinfo = []
self._verify()
#: Write-only, non-blocking file descriptor to the uinput device node.
self.fd = _uinput.open(devnode)
# set device capabilities
for etype, codes in events.items():
for code in codes:
# handle max, min, fuzz, flat
if isinstance(code, (tuple, list, device.AbsInfo)):
# flatten (ABS_Y, (0, 255, 0, 0)) to (ABS_Y, 0, 255, 0, 0)
f = [code[0]]
f += code[1]
absinfo.append(f)
code = code[0]
#:todo: a lot of unnecessary packing/unpacking
_uinput.enable(self.fd, etype, code)
# create uinput device
_uinput.create(self.fd, name, vendor, product, version,
bustype, absinfo, ff_effects_max)
#: An :class:`InputDevice <evdev.device.InputDevice>` instance
#: for the fake input device. ``None`` if the device cannot be
#: opened for reading and writing.
self.device = self._find_device()
def __enter__(self):
return self
def __exit__(self, type, value, tb):
if hasattr(self, 'fd'):
self.close()
def __repr__(self):
attr = 'name', 'bustype', 'vendor', 'product', 'version'
vals = (repr(getattr(self, i)) for i in attr)
vals = ', '.join(vals)
return '%s(%s)' % (self.__class__.__name__, vals)
def __str__(self):
msg = ('name "{}", bus "{}", vendor "{:04x}", product "{:04x}", version "{:04x}"\n'
'event types: {}')
evtypes = [i[0] for i in self.capabilities(True).keys()]
msg = msg.format(self.name, ecodes.BUS[self.bustype],
self.vendor, self.product,
self.version, ' '.join(evtypes))
return msg
def close(self):
# close the associated InputDevice, if it was previously opened
if self.device is not None:
self.device.close()
# destroy the uinput device
if self.fd > -1:
_uinput.close(self.fd)
self.fd = -1
def write_event(self, event):
'''
Inject an input event into the input subsystem. Events are
queued until a synchronization event is received.
:param event: InputEvent instance or an object with an
``event`` attribute (:class:`KeyEvent
<evdev.events.KeyEvent>`, :class:`RelEvent
<evdev.events.RelEvent>` etc).
Example::
ev = InputEvent(1334414993, 274296, ecodes.EV_KEY, ecodes.KEY_A, 1)
ui.write_event(ev)
'''
if hasattr(event, 'event'):
event = event.event
self.write(event.type, event.code, event.value)
def write(self, etype, code, value):
'''
Inject an input event into the input subsystem. Events are
queued until a synchronization event is received.
:param etype: event type (eg. ``EV_KEY``).
:param code: event code (eg. ``KEY_A``).
:param value: event value (eg. 0 1 2 - depends on event type).
Example::
ui.write(e.EV_KEY, e.KEY_A, 1) # key A - down
ui.write(e.EV_KEY, e.KEY_A, 0) # key A - up
'''
_uinput.write(self.fd, etype, code, value)
def read(self):
'''
Read a queued event from the uinput device. Returns ``None``
if no events are available.
'''
event = _input.device_read(self.fd)
_, _, etype, code, value = event
if etype == ecodes.EV_FF:
if self.ff_callback:
self.ff_callback(InputEvent(*event))
if etype == ecodes.EV_UINPUT:
if code == ecodes.UI_FF_UPLOAD:
data = _uinput.upload_effect(self.fd, value)
up_effect = uinput_ff_upload.from_buffer_copy(buffer(data))
if len(self.ff_effects) > ecodes.FF_EFFECT_MAX:
self.ff_effects.pop()
self.ff_effects.append(up_effect.effect)
elif code == ecodes.UI_FF_ERASE:
data = _uinput.erase_effect(self.fd, value)
er_effect = uinput_ff_erase.from_buffer_copy(buffer(data))
for n, effect in enumerate(self.ff_effects):
if er_effect.effect_id == effect.id:
del self.ff_effects[n]
def syn(self):
'''
Inject a ``SYN_REPORT`` event into the input subsystem. Events
queued by :func:`write()` will be fired. If possible, events
will be merged into an 'atomic' event.
'''
_uinput.write(self.fd, ecodes.EV_SYN, ecodes.SYN_REPORT, 0)
def capabilities(self, verbose=False, absinfo=True):
'''See :func:`capabilities <evdev.device.InputDevice.capabilities>`.'''
if self.device is None:
raise UInputError('input device not opened - cannot read capabilites')
return self.device.capabilities(verbose, absinfo)
def _verify(self):
'''
Verify that an uinput device exists and is readable and writable
by the current process.
'''
try:
m = os.stat(self.devnode)[stat.ST_MODE]
if not stat.S_ISCHR(m):
raise
except (IndexError, OSError):
msg = '"{}" does not exist or is not a character device file '\
'- verify that the uinput module is loaded'
raise UInputError(msg.format(self.devnode))
if not os.access(self.devnode, os.W_OK):
msg = '"{}" cannot be opened for writing'
raise UInputError(msg.format(self.devnode))
if len(self.name) > _uinput.maxnamelen:
msg = 'uinput device name must not be longer than {} characters'
raise UInputError(msg.format(_uinput.maxnamelen))
def _find_device(self):
#:bug: the device node might not be immediately available
time.sleep(0.1)
for fn in util.list_devices('/dev/input/'):
d = device.InputDevice(fn)
if d.name == self.name:
return d