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trezor-firmware/trezorlib/transport_hid.py
2013-11-15 01:43:05 +01:00

88 lines
2.5 KiB
Python

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