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#!/usr/bin/env python
#
# This is a module that gathers a list of serial ports including details on
# GNU/Linux systems.
#
# This file is part of pySerial. https://github.com/pyserial/pyserial
# (C) 2011-2015 Chris Liechti <[email protected]>
#
# SPDX-License-Identifier: BSD-3-Clause
from __future__ import absolute_import
import glob
import os
from serial.tools import list_ports_common
class SysFS(list_ports_common.ListPortInfo):
"""Wrapper for easy sysfs access and device info"""
def __init__(self, device):
super(SysFS, self).__init__(device)
# special handling for links
if device is not None and os.path.islink(device):
device = os.path.realpath(device)
is_link = True
else:
is_link = False
self.usb_device_path = None
if os.path.exists('/sys/class/tty/{}/device'.format(self.name)):
self.device_path = os.path.realpath('/sys/class/tty/{}/device'.format(self.name))
self.subsystem = os.path.basename(os.path.realpath(os.path.join(self.device_path, 'subsystem')))
else:
self.device_path = None
self.subsystem = None
# check device type
if self.subsystem == 'usb-serial':
self.usb_interface_path = os.path.dirname(self.device_path)
elif self.subsystem == 'usb':
self.usb_interface_path = self.device_path
else:
self.usb_interface_path = None
# fill-in info for USB devices
if self.usb_interface_path is not None:
self.usb_device_path = os.path.dirname(self.usb_interface_path)
try:
num_if = int(self.read_line(self.usb_device_path, 'bNumInterfaces'))
except ValueError:
num_if = 1
self.vid = int(self.read_line(self.usb_device_path, 'idVendor'), 16)
self.pid = int(self.read_line(self.usb_device_path, 'idProduct'), 16)
self.serial_number = self.read_line(self.usb_device_path, 'serial')
if num_if > 1: # multi interface devices like FT4232
self.location = os.path.basename(self.usb_interface_path)
else:
self.location = os.path.basename(self.usb_device_path)
self.manufacturer = self.read_line(self.usb_device_path, 'manufacturer')
self.product = self.read_line(self.usb_device_path, 'product')
self.interface = self.read_line(self.usb_interface_path, 'interface')
if self.subsystem in ('usb', 'usb-serial'):
self.apply_usb_info()
#~ elif self.subsystem in ('pnp', 'amba'): # PCI based devices, raspi
elif self.subsystem == 'pnp': # PCI based devices
self.description = self.name
self.hwid = self.read_line(self.device_path, 'id')
elif self.subsystem == 'amba': # raspi
self.description = self.name
self.hwid = os.path.basename(self.device_path)
if is_link:
self.hwid += ' LINK={}'.format(device)
def read_line(self, *args):
"""\
Helper function to read a single line from a file.
One or more parameters are allowed, they are joined with os.path.join.
Returns None on errors..
"""
try:
with open(os.path.join(*args)) as f:
line = f.readline().strip()
return line
except IOError:
return None
def comports(include_links=False):
devices = glob.glob('/dev/ttyS*') # built-in serial ports
devices.extend(glob.glob('/dev/ttyUSB*')) # usb-serial with own driver
devices.extend(glob.glob('/dev/ttyXRUSB*')) # xr-usb-serial port exar (DELL Edge 3001)
devices.extend(glob.glob('/dev/ttyACM*')) # usb-serial with CDC-ACM profile
devices.extend(glob.glob('/dev/ttyAMA*')) # ARM internal port (raspi)
devices.extend(glob.glob('/dev/rfcomm*')) # BT serial devices
devices.extend(glob.glob('/dev/ttyAP*')) # Advantech multi-port serial controllers
if include_links:
devices.extend(list_ports_common.list_links(devices))
return [info
for info in [SysFS(d) for d in devices]
if info.subsystem != "platform"] # hide non-present internal serial ports
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# test
if __name__ == '__main__':
for info in sorted(comports()):
print("{0}: {0.subsystem}".format(info))
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