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254
kivy/lib/mtdev.py
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254
kivy/lib/mtdev.py
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'''
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Python mtdev
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============
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The mtdev module provides Python bindings to the `Kernel multi-touch
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transformation library <https://launchpad.net/mtdev>`_, also known as mtdev
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(MIT license).
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The mtdev library transforms all variants of kernel MT events to the
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slotted type B protocol. The events put into mtdev may be from any MT
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device, specifically type A without contact tracking, type A with
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contact tracking, or type B with contact tracking. See the kernel
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documentation for further details.
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.. warning::
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This is an external library and Kivy does not provide any support for it.
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It might change in the future and we advise you don't rely on it in your
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code.
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'''
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# flake8: noqa
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import os
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import time
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from ctypes import cdll, Structure, c_ulong, c_int, c_ushort, \
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c_void_p, pointer, POINTER, byref
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# load library
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if 'KIVY_DOC' not in os.environ:
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libmtdev = cdll.LoadLibrary('libmtdev.so.1')
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# from linux/input.h
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MTDEV_CODE_SLOT = 0x2f # MT slot being modified
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MTDEV_CODE_TOUCH_MAJOR = 0x30 # Major axis of touching ellipse
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MTDEV_CODE_TOUCH_MINOR = 0x31 # Minor axis (omit if circular)
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MTDEV_CODE_WIDTH_MAJOR = 0x32 # Major axis of approaching ellipse
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MTDEV_CODE_WIDTH_MINOR = 0x33 # Minor axis (omit if circular)
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MTDEV_CODE_ORIENTATION = 0x34 # Ellipse orientation
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MTDEV_CODE_POSITION_X = 0x35 # Center X ellipse position
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MTDEV_CODE_POSITION_Y = 0x36 # Center Y ellipse position
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MTDEV_CODE_TOOL_TYPE = 0x37 # Type of touching device
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MTDEV_CODE_BLOB_ID = 0x38 # Group a set of packets as a blob
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MTDEV_CODE_TRACKING_ID = 0x39 # Unique ID of initiated contact
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MTDEV_CODE_PRESSURE = 0x3a # Pressure on contact area
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MTDEV_CODE_ABS_X = 0x00
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MTDEV_CODE_ABS_Y = 0x01
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MTDEV_CODE_ABS_Z = 0x02
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MTDEV_CODE_BTN_DIGI = 0x140
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MTDEV_CODE_BTN_TOOL_PEN = 0x140
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MTDEV_CODE_BTN_TOOL_RUBBER = 0x141
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MTDEV_CODE_BTN_TOOL_BRUSH = 0x142
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MTDEV_CODE_BTN_TOOL_PENCIL = 0x143
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MTDEV_CODE_BTN_TOOL_AIRBRUSH = 0x144
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MTDEV_CODE_BTN_TOOL_FINGER = 0x145
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MTDEV_CODE_BTN_TOOL_MOUSE = 0x146
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MTDEV_CODE_BTN_TOOL_LENS = 0x147
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MTDEV_CODE_BTN_TOUCH = 0x14a
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MTDEV_CODE_BTN_STYLUS = 0x14b
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MTDEV_CODE_BTN_STYLUS2 = 0x14c
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MTDEV_CODE_BTN_TOOL_DOUBLETAP = 0x14d
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MTDEV_CODE_BTN_TOOL_TRIPLETAP = 0x14e
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MTDEV_CODE_BTN_TOOL_QUADTAP = 0x14f # Four fingers on trackpad
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MTDEV_TYPE_EV_ABS = 0x03
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MTDEV_TYPE_EV_SYN = 0x00
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MTDEV_TYPE_EV_KEY = 0x01
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MTDEV_TYPE_EV_REL = 0x02
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MTDEV_TYPE_EV_ABS = 0x03
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MTDEV_TYPE_EV_MSC = 0x04
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MTDEV_TYPE_EV_SW = 0x05
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MTDEV_TYPE_EV_LED = 0x11
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MTDEV_TYPE_EV_SND = 0x12
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MTDEV_TYPE_EV_REP = 0x14
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MTDEV_TYPE_EV_FF = 0x15
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MTDEV_TYPE_EV_PWR = 0x16
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MTDEV_TYPE_EV_FF_STATUS = 0x17
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MTDEV_ABS_TRACKING_ID = 9
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MTDEV_ABS_POSITION_X = 5
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MTDEV_ABS_POSITION_Y = 6
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MTDEV_ABS_TOUCH_MAJOR = 0
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MTDEV_ABS_TOUCH_MINOR = 1
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MTDEV_ABS_WIDTH_MAJOR = 2
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MTDEV_ABS_WIDTH_MINOR = 3
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MTDEV_ABS_ORIENTATION = 4
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MTDEV_ABS_SIZE = 11
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class timeval(Structure):
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_fields_ = [
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('tv_sec', c_ulong),
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('tv_usec', c_ulong)
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]
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class input_event(Structure):
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_fields_ = [
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('time', timeval),
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('type', c_ushort),
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('code', c_ushort),
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('value', c_int)
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]
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class input_absinfo(Structure):
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_fields_ = [
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('value', c_int),
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('minimum', c_int),
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('maximum', c_int),
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('fuzz', c_int),
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('flat', c_int),
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('resolution', c_int)
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]
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class mtdev_caps(Structure):
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_fields_ = [
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('has_mtdata', c_int),
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('has_slot', c_int),
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('has_abs', c_int * MTDEV_ABS_SIZE),
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('slot', input_absinfo),
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('abs', input_absinfo * MTDEV_ABS_SIZE)
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]
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class mtdev(Structure):
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_fields_ = [
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('caps', mtdev_caps),
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('state', c_void_p)
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]
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# binding
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if 'KIVY_DOC' not in os.environ:
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mtdev_open = libmtdev.mtdev_open
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mtdev_open.argtypes = [POINTER(mtdev), c_int]
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mtdev_get = libmtdev.mtdev_get
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mtdev_get.argtypes = [POINTER(mtdev), c_int, POINTER(input_event), c_int]
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mtdev_idle = libmtdev.mtdev_idle
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mtdev_idle.argtypes = [POINTER(mtdev), c_int, c_int]
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mtdev_close = libmtdev.mtdev_close
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mtdev_close.argtypes = [POINTER(mtdev)]
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class Device:
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def __init__(self, filename):
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self._filename = filename
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self._fd = -1
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self._device = mtdev()
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# Linux kernel creates input devices then hands permission changes
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# off to udev. This results in a period of time when the device is
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# readable only by root. Device reconnects can be processed by
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# MTDMotionEventProvider faster than udev can get a chance to run,
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# so we spin for a period of time to allow udev to fix permissions.
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# We limit the loop time in case the system is misconfigured and
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# the user really does not (and will not) have permission to access
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# the device.
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# Note: udev takes about 0.6 s on a Raspberry Pi 4
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permission_wait_until = time.time() + 3.0
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while self._fd == -1:
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try:
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self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
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except PermissionError:
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if time.time() > permission_wait_until:
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raise
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ret = mtdev_open(pointer(self._device), self._fd)
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if ret != 0:
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os.close(self._fd)
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self._fd = -1
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raise Exception('Unable to open device')
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def close(self):
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'''Close the mtdev converter
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'''
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if self._fd == -1:
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return
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mtdev_close(pointer(self._device))
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os.close(self._fd)
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self._fd = -1
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def idle(self, ms):
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'''Check state of kernel device
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:Parameters:
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`ms`: int
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Number of milliseconds to wait for activity
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:Return:
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Return True if the device is idle, i.e, there are no fetched events
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in the pipe and there is nothing to fetch from the device.
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'''
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if self._fd == -1:
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raise Exception('Device closed')
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return bool(mtdev_idle(pointer(self._device), self._fd, ms))
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def get(self):
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if self._fd == -1:
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raise Exception('Device closed')
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ev = input_event()
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if mtdev_get(pointer(self._device), self._fd, byref(ev), 1) <= 0:
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return None
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return ev
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def has_mtdata(self):
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'''Return True if the device has multitouch data.
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'''
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if self._fd == -1:
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raise Exception('Device closed')
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return bool(self._device.caps.has_mtdata)
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def has_slot(self):
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'''Return True if the device has slot information.
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'''
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if self._fd == -1:
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raise Exception('Device closed')
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return bool(self._device.caps.has_slot)
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def has_abs(self, index):
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'''Return True if the device has abs data.
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:Parameters:
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`index`: int
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One of const starting with a name ABS_MT_
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'''
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if self._fd == -1:
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raise Exception('Device closed')
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if index < 0 or index >= MTDEV_ABS_SIZE:
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raise IndexError('Invalid index')
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return bool(self._device.caps.has_abs[index])
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def get_max_abs(self):
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'''Return the maximum number of abs information available.
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'''
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return MTDEV_ABS_SIZE
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def get_slot(self):
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'''Return the slot data.
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'''
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if self._fd == -1:
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raise Exception('Device closed')
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if self._device.caps.has_slot == 0:
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return
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return self._device.caps.slot
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def get_abs(self, index):
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'''Return the abs data.
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:Parameters:
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`index`: int
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One of const starting with a name ABS_MT_
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'''
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if self._fd == -1:
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raise Exception('Device closed')
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if index < 0 or index >= MTDEV_ABS_SIZE:
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raise IndexError('Invalid index')
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return self._device.caps.abs[index]
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