Can we query USB Port Link state in Python using USBLPM tool?

Question

I'm aware that USB3.0 low power states like U1, U2, U3 can be triggered using Microsoft's test tool like USBLPM and DEVCON tool in python script for external USB device.

USBLPM (U1/U2):
UsbLPM.exe /enable U1
UsbLPM.exe /enable U2

DEVCON (U3):
subprocess.run([devcon, 'disable', parsedHwid])

I just wonder is there any way we can query the USB Link Power state from python script? To make sure device has accepted link commands or not!

Answer 1

Hello there,

All USB ports can be accessed via /dev/bus/usb/< bus >/< device >

For the ID generated, even if you unplug the device and reattach it [ could be some other port ]. It will be the same.

import re
import subprocess
device_re = re.compile("Bus\s+(?P<bus>\d+)\s+Device\s+(?P<device>\d+).+ID\s(?P<id>\w+:\w+)\s(?P<tag>.+)$", re.I)
df = subprocess.check_output("lsusb")
devices = []
for i in df.split('\n'):
if i:
info = device_re.match(i)
if info:
dinfo = info.groupdict()
dinfo['device'] = '/dev/bus/usb/%s/%s' % (dinfo.pop('bus'), dinfo.pop('device'))
devices.append(dinfo)
print devices

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