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88 lines
2.5 KiB
Python
88 lines
2.5 KiB
Python
'''USB HID implementation of Transport.'''
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import hid
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import time
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from transport import Transport, NotImplementedException
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DEVICE_IDS = [
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(0x10c4, 0xea80), # Shield
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(0x534c, 0x0001), # Trezor
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]
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class FakeRead(object):
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# Let's pretend we have a file-like interface
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def __init__(self, func):
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self.func = func
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def read(self, size):
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return self.func(size)
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class HidTransport(Transport):
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def __init__(self, device, *args, **kwargs):
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self.hid = None
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self.buffer = ''
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if bool(kwargs.get('debug_link')):
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device = device[:-2] + '01'
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super(HidTransport, self).__init__(device, *args, **kwargs)
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@classmethod
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def enumerate(cls):
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devices = []
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for d in hid.enumerate(0, 0):
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vendor_id = d.get('vendor_id')
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product_id = d.get('product_id')
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path = d.get('path')
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if (vendor_id, product_id) in DEVICE_IDS and path.endswith(':00'):
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devices.append(path)
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return devices
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def _open(self):
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self.buffer = ''
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print self.device
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self.hid = hid.device()
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self.hid.open_path(self.device)
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self.hid.set_nonblocking(True)
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self.hid.send_feature_report([0x41, 0x01]) # enable UART
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self.hid.send_feature_report([0x43, 0x03]) # purge TX/RX FIFOs
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def _close(self):
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self.hid.close()
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self.buffer = ''
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self.hid = None
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def ready_to_read(self):
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return False
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def _write(self, msg):
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msg = bytearray(msg)
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while len(msg):
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# Report ID, data padded to 63 bytes
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self.hid.write([63, ] + list(msg[:63]) + [0] * (63 - len(msg[:63])))
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msg = msg[63:]
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def _read(self):
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(msg_type, datalen) = self._read_headers(FakeRead(self._raw_read))
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return (msg_type, self._raw_read(datalen))
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def _raw_read(self, length):
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while len(self.buffer) < length:
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data = self.hid.read(64)
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if not len(data):
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time.sleep(0.05)
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continue
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report_id = data[0]
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if report_id > 63:
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# Command report
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raise Exception("Not implemented")
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# Payload received, skip the report ID
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self.buffer += str(bytearray(data[1:]))
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ret = self.buffer[:length]
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self.buffer = self.buffer[length:]
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return ret
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