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#
# Copyright (C) 2018 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import fcntl
import logging
import os
from vts.utils.python.common import cmd_utils
# _IO('U', 20)
USBDEVFS_RESET = ord("U") << 8 | 20
def GetDevicesUSBFilePath():
"""Sweeps through connected USB device info and maps serial number to them.
Returns:
A dict, serial numbers of the devices as the key, device file path
corresponding to the serial number as the value.
"""
ret = {}
sh_stdout, sh_stderr, ret_code = cmd_utils.ExecuteOneShellCommand("which udevadm")
if ret_code != 0:
logging.error("`udevadm` doesn't exist on the host; "
"please install 'udev' pkg before retrying.")
return ret
sh_stdout, _, _ = cmd_utils.ExecuteOneShellCommand(
"find /sys/bus/usb/devices/usb*/ -name dev")
lines = sh_stdout.split()
for line in lines:
syspath = os.path.dirname(line)
devname, _, _ = cmd_utils.ExecuteOneShellCommand(
"udevadm info -q name -p %s" % syspath)
if devname.startswith("bus/"):
serial, _, _ = cmd_utils.ExecuteOneShellCommand(
"udevadm info -q property --export -p %s | grep ID_SERIAL_SHORT"
% syspath)
if serial:
device_serial = serial.split("=")[1].strip().strip("'")
ret[device_serial] = os.path.join("/dev", devname.strip())
return ret
def ResetDeviceUsb(dev_file_path):
"""Invokes ioctl that resets the USB device on the given file path.
Args:
dev_file_path: string, abs path to the device file
Returns:
True if successful, False otherwise.
"""
try:
with open(dev_file_path, "wb") as usb_fd:
fcntl.ioctl(usb_fd, USBDEVFS_RESET, 0)
except IOError as e:
logging.exception(e)
return False
return True
def ResetUsbDeviceOfSerial(serial):
"""Resets a USB device file corresponding to the given serial.
Args:
serial: string, serial number of the device whose USB device file
will reset.
Returns:
True if successful, False otherwise.
"""
device_file_path = GetDevicesUSBFilePath()
if serial in device_file_path:
logging.error(
"Device %s not responding. Resetting device file %s.", serial,
device_file_path[serial])
return ResetDeviceUsb(device_file_path[serial])
return False
def ResetUsbDeviceOfSerial_Callback(*args):
"""Wrapper of the ResetUsbDeviceOfSerial(), for handling the *args.
Args:
args: tuple of arguments, expected to have the serial number of
the devices as the first element.
Returns:
True if successful, False otherwise.
"""
try:
return ResetUsbDeviceOfSerial(args[0])
except IndexError as e:
logging.exception(e)
return False
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