usb-driver.py

#!/usr/bin/env python

import usb.core
import usb.util
import sys
from evdev import UInput, AbsInfo, ecodes as e

# find our device
dev = usb.core.find(idVendor=0x2914, idProduct=0x0100)
if dev.is_kernel_driver_active(1):
    dev.detach_kernel_driver(1)
if dev.is_kernel_driver_active(0):
    try:
        dev.detach_kernel_driver(0)
    except:
        dev.attach_kernel_driver(1)

#dev.set_configuration()
#usb.util.claim_interface(dev, 1)
#usb.util.claim_interface(dev, 0)

# knock into tablet mode
payload = '\x05\x00\x03'
while True:
    try:
        assert dev.ctrl_transfer(0x21, 0x09, 0x0305, 1, payload, 100) == len(payload)
        break
    except usb.USBError as err:
        if err.args != (110, 'Operation timed out') and err.args != (32, 'Pipe error'):
            raise err
        print('payload transfer failed, retrying')
print('Payload sent')

# Pull out interrupt endpoint
cfg = dev[0]
intf = cfg[(1,0)]
ep = intf[0]

# Maximum position possible
minxpos = 0
minypos = 0
maxxpos = 19780
maxypos = 13442
minpressure = 0
maxpressure = 255

# Initialise UInput device
cap = {
    e.EV_KEY : (e.BTN_TOUCH, e.BTN_STYLUS2),
    e.EV_ABS : [
        (e.ABS_PRESSURE, AbsInfo(value=minpressure, max=maxpressure, min=0, fuzz=0, flat=0, resolution=0)),
        (e.ABS_X, AbsInfo(value=minxpos, max=maxxpos, min=0, fuzz=0, flat=0, resolution=0)),
        (e.ABS_Y, AbsInfo(value=minypos, max=maxypos, min=0, fuzz=0, flat=0, resolution=0))]
}
ui = UInput(cap, name='boogie-board-sync-pen')

try:
    while True:
        try:
            data = ep.read(8, 100)
        except usb.USBError as err:
            if err.args != (110, 'Operation timed out'):
                raise err
            continue

        xpos = data[1] | data[2] << 8
        ypos = data[3] | data[4] << 8

        if xpos < minxpos:
            minxpos = xpos
            print('updated minxpos to %d' % minxpos)
        if xpos > maxxpos:
            maxxpos = xpos
            print('updated maxxpos to %d' % maxxpos)
        if ypos < minypos:
            minypos = ypos
            print('updated minypos to %d' % minypos)
        if ypos > maxypos:
            maxypos = ypos
            print('updated maxypos to %d' % maxypos)

        pressure = data[5] | data[6] << 8
        touch = data[7] & 0x01
        stylus = (data[7] & 0x02)>>1
        ui.write(e.EV_ABS, e.ABS_PRESSURE, pressure)
        ui.write(e.EV_ABS, e.ABS_X, xpos)
        ui.write(e.EV_ABS, e.ABS_Y, ypos)
        ui.write(e.EV_KEY,e.BTN_TOUCH,touch)
        ui.write(e.EV_KEY,e.BTN_STYLUS2,stylus)
        ui.syn()
except KeyboardInterrupt:
    pass

usb.util.release_interface(dev, 0)
usb.util.release_interface(dev, 1)
dev.attach_kernel_driver(0)
dev.attach_kernel_driver(1)