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evdev.py
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evdev.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
""" evdev.py
This is a Python interface to the Linux input system's event device.
Events can be read from an open event file and decoded into spiffy
python objects. The Event objects can optionally be fed into a Device
object that represents the complete state of the device being monitored.
Copyright (C) 2003-2004 Micah Dowty <micah@navi.cx>
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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
import struct, sys, os, time, select
from fcntl import ioctl
__all__ = ["DeviceGroup"]
def demo():
"""Open the event device named on the command line, use incoming
events to update a device, and show the state of this device.
"""
dev = DeviceGroup(sys.argv[1:])
while 1:
event = dev.next_event()
if event is not None:
if event.type == "EV_KEY" and event.value == 1:
if event.code.startswith("KEY"):
print event.scanCode
elif event.code.startswith("BTN"):
print event.code
class BaseDevice:
"""Base class representing the state of an input device, with axes and buttons.
Event instances can be fed into the Device to update its state.
"""
def __init__(self):
self.axes = {}
self.buttons = {}
self.name = None
def __repr__(self):
return "<Device name=%r axes=%r buttons=%r>" % (
self.name, self.axes, self.buttons)
def update(self, event):
f = getattr(self, "update_%s" % event.type, None)
if f:
f(event)
def update_EV_KEY(self, event):
self.buttons[event.code] = event.value
def update_EV_ABS(self, event):
self.axes[event.code] = event.value
def update_EV_REL(self, event):
self.axes[event.code] = self.axes.get(event.code, 0) + event.value
def __getitem__(self, name):
"""Retrieve the current value of an axis or button,
or zero if no data has been received for it yet.
"""
if name in self.axes:
return self.axes[name]
else:
return self.buttons.get(name, 0)
# evdev ioctl constants. The horrible mess here
# is to silence silly FutureWarnings
EVIOCGNAME_512 = ~int(~0x82004506L & 0xFFFFFFFFL)
EVIOCGID = ~int(~0x80084502L & 0xFFFFFFFFL)
EVIOCGBIT_512 = ~int(~0x81fe4520L & 0xFFFFFFFFL)
EVIOCGABS_512 = ~int(~0x80144540L & 0xFFFFFFFFL)
class Device(BaseDevice):
"""An abstract input device attached to a Linux evdev device node"""
def __init__(self, filename):
BaseDevice.__init__(self)
self.fd = os.open(filename, os.O_RDONLY | os.O_NONBLOCK)
self.packetSize = Event.get_format_size()
self.readMetadata()
def poll(self):
"""Receive and process all available input events"""
while 1:
try:
buffer = os.read(self.fd, self.packetSize)
except OSError:
return
self.update(Event(unpack=buffer))
def readMetadata(self):
"""Read device identity and capabilities via ioctl()"""
buffer = "\0"*512
# Read the name
self.name = ioctl(self.fd, EVIOCGNAME_512, buffer)
self.name = self.name[:self.name.find("\0")]
# Read info on each absolute axis
absmap = Event.codeMaps['EV_ABS']
buffer = "\0" * struct.calcsize("iiiii")
self.absAxisInfo = {}
for name, number in absmap.nameMap.iteritems():
#values = struct.unpack("iiiii", ioctl(self.fd, EVIOCGABS_512 + number, buffer))
#values = dict(zip(( 'value', 'min', 'max', 'fuzz', 'flat' ),values))
values = 'yo'
self.absAxisInfo[name] = values
def update_EV_ABS(self, event):
"""Scale the absolute axis into the range [-1, 1] using absAxisInfo"""
try:
info = self.absAxisInfo[event.code]
except KeyError:
return
range = float(info['max'] - info['min'])
self.axes[event.code] = (event.value - info['min']) / range * 2.0 - 1.0
class DeviceGroup:
"""
Capture events from a group of event devices.
"""
def __init__(self, fileNames):
self.devices = []
self.fds = []
self.packetSize = Event.get_format_size()
for fileName in fileNames:
self.devices.append(Device(fileName))
for device in self.devices:
print repr(device)
self.fds.append(device.fd)
def next_event(self):
r, w, x = select.select(self.fds, [], [], 1)
for fd in self.fds:
if fd in r:
buffer = os.read(fd, self.packetSize)
event = Event(unpack=buffer)
return event
return None
def flush(self):
for device in self.devices:
device.poll()
def close(self):
for fd in self.fds:
try:
os.close(fd)
except:
print "Warning - failed to close on or more device file descriptors"
pass
class EnumDict:
"""A 1:1 mapping from numbers to strings or other objects, for enumerated
types and other assigned numbers. The mapping can be queried in either
direction. All values, by default, map to themselves.
"""
def __init__(self, numberMap):
self.numberMap = numberMap
self.nameMap = {}
for key, value in numberMap.iteritems():
self.nameMap[value] = key
def toNumber(self, name):
return self.nameMap.get(name, name)
def fromNumber(self, num):
return self.numberMap.get(num, num)
class Event:
"""Represents one linux input system event. It can
be encoded and decoded in the 'struct input_event'
format used by the kernel. Types and codes are automatically
encoded and decoded with the #define names used in input.h
"""
ts_format = "@LL"
format = "=HHl"
typeMap = EnumDict({
0x00: "EV_RST",
0x01: "EV_KEY",
0x02: "EV_REL",
0x03: "EV_ABS",
0x04: "EV_MSC",
0x11: "EV_LED",
0x12: "EV_SND",
0x14: "EV_REP",
0x15: "EV_FF",
})
codeMaps = {
"EV_KEY": EnumDict({
0: "KEY_RESERVED",
1: "KEY_ESC",
2: "KEY_1",
3: "KEY_2",
4: "KEY_3",
5: "KEY_4",
6: "KEY_5",
7: "KEY_6",
8: "KEY_7",
9: "KEY_8",
10: "KEY_9",
11: "KEY_0",
12: "KEY_MINUS",
13: "KEY_EQUAL",
14: "KEY_BACKSPACE",
15: "KEY_TAB",
16: "KEY_Q",
17: "KEY_W",
18: "KEY_E",
19: "KEY_R",
20: "KEY_T",
21: "KEY_Y",
22: "KEY_U",
23: "KEY_I",
24: "KEY_O",
25: "KEY_P",
26: "KEY_LEFTBRACE",
27: "KEY_RIGHTBRACE",
28: "KEY_ENTER",
29: "KEY_LEFTCTRL",
30: "KEY_A",
31: "KEY_S",
32: "KEY_D",
33: "KEY_F",
34: "KEY_G",
35: "KEY_H",
36: "KEY_J",
37: "KEY_K",
38: "KEY_L",
39: "KEY_SEMICOLON",
40: "KEY_APOSTROPHE",
41: "KEY_GRAVE",
42: "KEY_LEFTSHIFT",
43: "KEY_BACKSLASH",
44: "KEY_Z",
45: "KEY_X",
46: "KEY_C",
47: "KEY_V",
48: "KEY_B",
49: "KEY_N",
50: "KEY_M",
51: "KEY_COMMA",
52: "KEY_DOT",
53: "KEY_SLASH",
54: "KEY_RIGHTSHIFT",
55: "KEY_KPASTERISK",
56: "KEY_LEFTALT",
57: "KEY_SPACE",
58: "KEY_CAPSLOCK",
59: "KEY_F1",
60: "KEY_F2",
61: "KEY_F3",
62: "KEY_F4",
63: "KEY_F5",
64: "KEY_F6",
65: "KEY_F7",
66: "KEY_F8",
67: "KEY_F9",
68: "KEY_F10",
69: "KEY_NUMLOCK",
70: "KEY_SCROLLLOCK",
71: "KEY_KP7",
72: "KEY_KP8",
73: "KEY_KP9",
74: "KEY_KPMINUS",
75: "KEY_KP4",
76: "KEY_KP5",
77: "KEY_KP6",
78: "KEY_KPPLUS",
79: "KEY_KP1",
80: "KEY_KP2",
81: "KEY_KP3",
82: "KEY_KP0",
83: "KEY_KPDOT",
84: "KEY_103RD",
85: "KEY_F13",
86: "KEY_102ND",
87: "KEY_F11",
88: "KEY_F12",
89: "KEY_F14",
90: "KEY_F15",
91: "KEY_F16",
92: "KEY_F17",
93: "KEY_F18",
94: "KEY_F19",
95: "KEY_F20",
96: "KEY_KPENTER",
97: "KEY_RIGHTCTRL",
98: "KEY_KPSLASH",
99: "KEY_SYSRQ",
100: "KEY_RIGHTALT",
101: "KEY_LINEFEED",
102: "KEY_HOME",
103: "KEY_UP",
104: "KEY_PAGEUP",
105: "KEY_LEFT",
106: "KEY_RIGHT",
107: "KEY_END",
108: "KEY_DOWN",
109: "KEY_PAGEDOWN",
110: "KEY_INSERT",
111: "KEY_DELETE",
112: "KEY_MACRO",
113: "KEY_MUTE",
114: "KEY_VOLUMEDOWN",
115: "KEY_VOLUMEUP",
116: "KEY_POWER",
117: "KEY_KPEQUAL",
118: "KEY_KPPLUSMINUS",
119: "KEY_PAUSE",
120: "KEY_F21",
121: "KEY_F22",
122: "KEY_F23",
123: "KEY_F24",
124: "KEY_KPCOMMA",
125: "KEY_LEFTMETA",
126: "KEY_RIGHTMETA",
127: "KEY_COMPOSE",
128: "KEY_STOP",
129: "KEY_AGAIN",
130: "KEY_PROPS",
131: "KEY_UNDO",
132: "KEY_FRONT",
133: "KEY_COPY",
134: "KEY_OPEN",
135: "KEY_PASTE",
136: "KEY_FIND",
137: "KEY_CUT",
138: "KEY_HELP",
139: "KEY_MENU",
140: "KEY_CALC",
141: "KEY_SETUP",
142: "KEY_SLEEP",
143: "KEY_WAKEUP",
144: "KEY_FILE",
145: "KEY_SENDFILE",
146: "KEY_DELETEFILE",
147: "KEY_XFER",
148: "KEY_PROG1",
149: "KEY_PROG2",
150: "KEY_WWW",
151: "KEY_MSDOS",
152: "KEY_COFFEE",
153: "KEY_DIRECTION",
154: "KEY_CYCLEWINDOWS",
155: "KEY_MAIL",
156: "KEY_BOOKMARKS",
157: "KEY_COMPUTER",
158: "KEY_BACK",
159: "KEY_FORWARD",
160: "KEY_CLOSECD",
161: "KEY_EJECTCD",
162: "KEY_EJECTCLOSECD",
163: "KEY_NEXTSONG",
164: "KEY_PLAYPAUSE",
165: "KEY_PREVIOUSSONG",
166: "KEY_STOPCD",
167: "KEY_RECORD",
168: "KEY_REWIND",
169: "KEY_PHONE",
170: "KEY_ISO",
171: "KEY_CONFIG",
172: "KEY_HOMEPAGE",
173: "KEY_REFRESH",
174: "KEY_EXIT",
175: "KEY_MOVE",
176: "KEY_EDIT",
177: "KEY_SCROLLUP",
178: "KEY_SCROLLDOWN",
179: "KEY_KPLEFTPAREN",
180: "KEY_KPRIGHTPAREN",
181: "KEY_INTL1",
182: "KEY_INTL2",
183: "KEY_INTL3",
184: "KEY_INTL4",
185: "KEY_INTL5",
186: "KEY_INTL6",
187: "KEY_INTL7",
188: "KEY_INTL8",
189: "KEY_INTL9",
190: "KEY_LANG1",
191: "KEY_LANG2",
192: "KEY_LANG3",
193: "KEY_LANG4",
194: "KEY_LANG5",
195: "KEY_LANG6",
196: "KEY_LANG7",
197: "KEY_LANG8",
198: "KEY_LANG9",
200: "KEY_PLAYCD",
201: "KEY_PAUSECD",
202: "KEY_PROG3",
203: "KEY_PROG4",
205: "KEY_SUSPEND",
206: "KEY_CLOSE",
220: "KEY_UNKNOWN",
224: "KEY_BRIGHTNESSDOWN",
225: "KEY_BRIGHTNESSUP",
0x100: "BTN_0",
0x101: "BTN_1",
0x102: "BTN_2",
0x103: "BTN_3",
0x104: "BTN_4",
0x105: "BTN_5",
0x106: "BTN_6",
0x107: "BTN_7",
0x108: "BTN_8",
0x109: "BTN_9",
0x110: "BTN_LEFT",
0x111: "BTN_RIGHT",
0x112: "BTN_MIDDLE",
0x113: "BTN_SIDE",
0x114: "BTN_EXTRA",
0x115: "BTN_FORWARD",
0x116: "BTN_BACK",
0x120: "BTN_TRIGGER",
0x121: "BTN_THUMB",
0x122: "BTN_THUMB2",
0x123: "BTN_TOP",
0x124: "BTN_TOP2",
0x125: "BTN_PINKIE",
0x126: "BTN_BASE",
0x127: "BTN_BASE2",
0x128: "BTN_BASE3",
0x129: "BTN_BASE4",
0x12a: "BTN_BASE5",
0x12b: "BTN_BASE6",
0x12f: "BTN_DEAD",
0x130: "BTN_A",
0x131: "BTN_B",
0x132: "BTN_C",
0x133: "BTN_X",
0x134: "BTN_Y",
0x135: "BTN_Z",
0x136: "BTN_TL",
0x137: "BTN_TR",
0x138: "BTN_TL2",
0x139: "BTN_TR2",
0x13a: "BTN_SELECT",
0x13b: "BTN_START",
0x13c: "BTN_MODE",
0x13d: "BTN_THUMBL",
0x13e: "BTN_THUMBR",
0x140: "BTN_TOOL_PEN",
0x141: "BTN_TOOL_RUBBER",
0x142: "BTN_TOOL_BRUSH",
0x143: "BTN_TOOL_PENCIL",
0x144: "BTN_TOOL_AIRBRUSH",
0x145: "BTN_TOOL_FINGER",
0x146: "BTN_TOOL_MOUSE",
0x147: "BTN_TOOL_LENS",
0x14a: "BTN_TOUCH",
0x14b: "BTN_STYLUS",
0x14c: "BTN_STYLUS2",
}),
"EV_REL": EnumDict({
0x00: "REL_X",
0x01: "REL_Y",
0x02: "REL_Z",
0x06: "REL_HWHEEL",
0x07: "REL_DIAL",
0x08: "REL_WHEEL",
0x09: "REL_MISC",
}),
"EV_ABS": EnumDict({
0x00: "ABS_X",
0x01: "ABS_Y",
0x02: "ABS_Z",
0x03: "ABS_RX",
0x04: "ABS_RY",
0x05: "ABS_RZ",
0x06: "ABS_THROTTLE",
0x07: "ABS_RUDDER",
0x08: "ABS_WHEEL",
0x09: "ABS_GAS",
0x0a: "ABS_BRAKE",
0x10: "ABS_HAT0X",
0x11: "ABS_HAT0Y",
0x12: "ABS_HAT1X",
0x13: "ABS_HAT1Y",
0x14: "ABS_HAT2X",
0x15: "ABS_HAT2Y",
0x16: "ABS_HAT3X",
0x17: "ABS_HAT3Y",
0x18: "ABS_PRESSURE",
0x19: "ABS_DISTANCE",
0x1a: "ABS_TILT_X",
0x1b: "ABS_TILT_Y",
0x1c: "ABS_MISC",
}),
"EV_MSC": EnumDict({
0x00: "MSC_SERIAL",
0x01: "MSC_PULSELED",
}),
"EV_LED": EnumDict({
0x00: "LED_NUML",
0x01: "LED_CAPSL",
0x02: "LED_SCROLLL",
0x03: "LED_COMPOSE",
0x04: "LED_KANA",
0x05: "LED_SLEEP",
0x06: "LED_SUSPEND",
0x07: "LED_MUTE",
0x08: "LED_MISC",
}),
"EV_REP": EnumDict({
0x00: "REP_DELAY",
0x01: "REP_PERIOD",
}),
"EV_SND": EnumDict({
0x00: "SND_CLICK",
0x01: "SND_BELL",
}),
}
def __init__(self, timestamp=0, type=0, code=0, value=0, unpack=None, readFrom=None):
self.timestamp = timestamp
self.type = type
self.code = code
self.scanCode = -1
self.value = value
if unpack is not None:
self.unpack(unpack)
if readFrom is not None:
self.readFrom(readFrom)
def __repr__(self):
return "<Event timestamp=%r type=%r code=%r value=%r>" % (
self.timestamp, self.type, self.code, self.value)
@staticmethod
def get_format_size():
return struct.calcsize(Event.ts_format) + struct.calcsize(Event.format)
def pack(self):
"""Pack this event into an input_event struct in
the local machine's byte order.
"""
secs = int(self.timestamp)
usecs = int((self.timestamp - secs) * 1000000)
packedType = self.typeMap.toNumber(self.type)
if self.type in self.codeMaps:
packedCode = self.codeMaps[self.type].toNumber(self.code)
else:
packedCode = self.code
return struct.pack(self.ts_format, secs, usecs) + \
struct.pack(self.format, packedType, packedCode, self.value)
def unpack(self, s):
"""Unpack ourselves from the given string,, an
input_event struct in the local byte order.
"""
ts_len = struct.calcsize(self.ts_format)
secs, usecs = struct.unpack(self.ts_format, s[:ts_len])
packedType, packedCode, self.value = struct.unpack(self.format, s[ts_len:])
self.timestamp = secs + (usecs / 1000000.0)
self.type = self.typeMap.fromNumber(packedType)
if self.type in self.codeMaps:
self.code = self.codeMaps[self.type].fromNumber(packedCode)
else:
self.code = packedCode
self.scanCode = packedCode
def readFrom(self, stream):
"""Read the next event from the given file-like object"""
self.unpack(stream.read(Event.get_format_size()))
if __name__ == "__main__":
demo()
### The End ###