linux-ppm/js_list.py at main · pkerney/linux-ppm · GitHub

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# Released by rdb under the Unlicense (unlicense.org)
# Based on information from:
# https://www.kernel.org/doc/Documentation/input/joystick-api.txt

import os, struct, array
from fcntl import ioctl, fcntl, F_GETFL, F_SETFL

# Iterate over the joystick devices.
print('Available devices:')

fn = {}
jsdev = {}

# We'll store the states here.
axis_states = {}
button_states = {}

# These constants were borrowed from linux/input.h
axis_names = {
    0x00 : 'x',
    0x01 : 'y',
    0x02 : 'z',
    0x03 : 'rx',
    0x04 : 'ry',
    0x05 : 'rz',
    0x06 : 'throttle',
    0x07 : 'rudder',
    0x08 : 'wheel',
    0x09 : 'gas',
    0x0a : 'brake',
    0x10 : 'hat0x',
    0x11 : 'hat0y',
    0x12 : 'hat1x',
    0x13 : 'hat1y',
    0x14 : 'hat2x',
    0x15 : 'hat2y',
    0x16 : 'hat3x',
    0x17 : 'hat3y',
    0x18 : 'pressure',
    0x19 : 'distance',
    0x1a : 'tilt_x',
    0x1b : 'tilt_y',
    0x1c : 'tool_width',
    0x20 : 'volume',
    0x28 : 'misc',
}

button_names = {
    0x120 : 'trigger',
    0x121 : 'thumb',
    0x122 : 'thumb2',
    0x123 : 'top',
    0x124 : 'top2',
    0x125 : 'pinkie',
    0x126 : 'base',
    0x127 : 'base2',
    0x128 : 'base3',
    0x129 : 'base4',
    0x12a : 'base5',
    0x12b : 'base6',
    0x12f : 'dead',
    0x130 : 'a',
    0x131 : 'b',
    0x132 : 'c',
    0x133 : 'x',
    0x134 : 'y',
    0x135 : 'z',
    0x136 : 'tl',
    0x137 : 'tr',
    0x138 : 'tl2',
    0x139 : 'tr2',
    0x13a : 'select',
    0x13b : 'start',
    0x13c : 'mode',
    0x13d : 'thumbl',
    0x13e : 'thumbr',

    0x220 : 'dpad_up',
    0x221 : 'dpad_down',
    0x222 : 'dpad_left',
    0x223 : 'dpad_right',

    # XBox 360 controller uses these codes.
    0x2c0 : 'dpad_left',
    0x2c1 : 'dpad_right',
    0x2c2 : 'dpad_up',
    0x2c3 : 'dpad_down',
}

for filename in os.listdir('/dev/input'):
    if filename.startswith('js'):
        print('')
        fn[filename] = '/dev/input/'+filename
        print('-----'+fn[filename])

        # Open the joystick device.
        print('     Opening %s...' % fn[filename])
        jsdev[filename] = open(fn[filename], 'rb')
        fcntl(jsdev[filename], F_SETFL, fcntl(jsdev[filename], F_GETFL) | os.O_NONBLOCK)

        # Get the device name.
        #buf = bytearray(63)
        buf = array.array('B', [0] * 64)
        ioctl(jsdev[filename], 0x80006a13 + (0x10000 * len(buf)), buf) # JSIOCGNAME(len)
        js_name = buf.tobytes().rstrip(b'\x00').decode('utf-8')
        print('     Device name: ->%s<-' % js_name)

        # Get number of axes and buttons.
        buf = array.array('B', [0])
        ioctl(jsdev[filename], 0x80016a11, buf) # JSIOCGAXES
        num_axes = buf[0]

        buf = array.array('B', [0])
        ioctl(jsdev[filename], 0x80016a12, buf) # JSIOCGBUTTONS
        num_buttons = buf[0]

        # Get the axis map.
        buf = array.array('B', [0] * 0x40)
        ioctl(jsdev[filename], 0x80406a32, buf) # JSIOCGAXMAP

        axis_map = []
        button_map = []

        for axis in buf[:num_axes]:
            axis_name = axis_names.get(axis, 'unknown(0x%02x)' % axis)
            axis_map.append(axis_name)
            axis_states[axis_name] = 0.0

        # Get the button map.
        buf = array.array('H', [0] * 200)
        ioctl(jsdev[filename], 0x80406a34, buf) # JSIOCGBTNMAP

        for btn in buf[:num_buttons]:
            btn_name = button_names.get(btn, 'unknown(0x%03x)' % btn)
            button_map.append(btn_name)
            button_states[btn_name] = 0

        print('     %d axes found: %s' % (num_axes, ', '.join(axis_map)))
        print('     %d buttons found: %s' % (num_buttons, ', '.join(button_map)))