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# Copyright 2017 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Ignore indention messages, since legacy scripts use 2 spaces instead of 4.
# pylint: disable=bad-indentation,docstring-section-indent
# pylint: disable=docstring-trailing-quotes
"""Utilities for using lightweight console functions."""
# Note: This is a py2/3 compatible file.
import datetime
import errno
import os
import re
import subprocess
import sys
import time
import six
from . import pty_driver
from . import stm32uart
def get_subprocess_args():
if six.PY3:
return {'encoding': 'utf-8'}
return {}
class TinyServoError(Exception):
"""Exceptions."""
def log(output):
"""Print output to console, logfiles can be added here.
Args:
output: string to output.
"""
sys.stdout.write(output)
sys.stdout.write('\n')
sys.stdout.flush()
def check_usb(vidpid, serialname=None):
"""Check if |vidpid| is present on the system's USB.
Args:
vidpid: string representation of the usb vid:pid, eg. '18d1:2001'
serialname: serialname if specified.
Returns: True if found, False, otherwise.
"""
if serialname:
output = subprocess.check_output(['lsusb', '-v', '-d', vidpid],
**get_subprocess_args())
m = re.search(r'^\s*iSerial\s+\d+\s+%s$' % serialname, output, flags=re.M)
if m:
return True
return False
else:
if subprocess.call(['lsusb', '-d', vidpid], stdout=open('/dev/null', 'w')):
return False
return True
def check_usb_sn(vidpid):
"""Return the serial number
Return the serial number of the first USB device with VID:PID vidpid,
or None if no device is found. This will not work well with two of
the same device attached.
Args:
vidpid: string representation of the usb vid:pid, eg. '18d1:2001'
Returns: string serial number if found, None otherwise.
"""
output = subprocess.check_output(['lsusb', '-v', '-d', vidpid],
**get_subprocess_args())
m = re.search(r'^\s*iSerial\s+(.*)$', output, flags=re.M)
if m:
return m.group(1)
return None
def wait_for_usb_remove(vidpid, serialname=None, timeout=None):
"""Wait for USB device with vidpid to be removed.
Wrapper for wait_for_usb below
"""
wait_for_usb(vidpid, serialname=serialname,
timeout=timeout, desiredpresence=False)
def wait_for_usb(vidpid, serialname=None, timeout=None, desiredpresence=True):
"""Wait for usb device with vidpid to be present/absent.
Args:
vidpid: string representation of the usb vid:pid, eg. '18d1:2001'
serialname: serialname if specificed.
timeout: timeout in seconds, None for no timeout.
desiredpresence: True for present, False for not present.
Raises:
TinyServoError: on timeout.
"""
if timeout:
finish = datetime.datetime.now() + datetime.timedelta(seconds=timeout)
while check_usb(vidpid, serialname) != desiredpresence:
time.sleep(.1)
if timeout:
if datetime.datetime.now() > finish:
raise TinyServoError('Timeout', 'Timeout waiting for USB %s' % vidpid)
def do_serialno(serialno, pty):
"""Set serialnumber 'serialno' via ec console 'pty'.
Commands are:
# > serialno set 1234
# Saving serial number
# Serial number: 1234
Args:
serialno: string serial number to set.
pty: tinyservo console to send commands.
Raises:
TinyServoError: on failure to set.
ptyError: on command interface error.
"""
cmd = 'serialno set %s' % serialno
regex = 'Serial number:\s+(\S+)'
results = pty._issue_cmd_get_results(cmd, [regex])[0]
sn = results[1].strip().strip('\n\r')
if sn == serialno:
log('Success !')
log('Serial set to %s' % sn)
else:
log('Serial number set to %s but saved as %s.' % (serialno, sn))
raise TinyServoError(
'Serial Number',
'Serial number set to %s but saved as %s.' % (serialno, sn))
def setup_tinyservod(vidpid, interface, serialname=None, debuglog=False):
"""Set up a pty
Set up a pty to the ec console in order
to send commands. Returns a pty_driver object.
Args:
vidpid: string vidpid of device to access.
interface: not used.
serialname: string serial name of device requested, optional.
debuglog: chatty printout (boolean)
Returns: pty object
Raises:
UsbError, SusbError: on device not found
"""
vidstr, pidstr = vidpid.split(':')
vid = int(vidstr, 16)
pid = int(pidstr, 16)
suart = stm32uart.Suart(vendor=vid, product=pid,
interface=interface, serialname=serialname,
debuglog=debuglog)
suart.run()
pty = pty_driver.ptyDriver(suart, [])
return pty
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