Ttgjyuk

Question

Is it possible to reset the connection of a USB device, without physically disconnecting/connecting from the PC?

Specifically, my device is a digital camera. I'm using gphoto2, but lately I get "device read errors", so I'd like to try to do a software-reset of the connection.

From what I can tell, there are no kernel modules being loaded for the camera. The only one that looks related is usbhid.

i tried both solutions by Li Lo and ssokolow, all i get is permission denied, nomatter if i use the usbreset code or the command line "echo 0 > ..." i use sudo, also my usb devices are owned by root but i can use them without admin rights(cameras..) — user290672, Jun 8 '14 at 16:40
If you are getting read errors, you might have some data corruption. If your camera uses an external memory card (such as MicroSD), it might be wise to connect it to the computer and run fsck. — Jun 8 '14 at 18:47

Aditya 9,388125589 · Accepted Answer · 2013-10-20 22:07:36Z

Save the following as usbreset.c

/* usbreset -- send a USB port reset to a USB device */

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>

#include <linux/usbdevice_fs.h>


int main(int argc, char **argv)

 const char *filename;
 int fd;
 int rc;

 if (argc != 2) 
 fprintf(stderr, "Usage: usbreset device-filenamen");
 return 1;
 
 filename = argv[1];

 fd = open(filename, O_WRONLY);
 if (fd < 0) 
 perror("Error opening output file");
 return 1;
 

 printf("Resetting USB device %sn", filename);
 rc = ioctl(fd, USBDEVFS_RESET, 0);
 if (rc < 0) 
 perror("Error in ioctl");
 return 1;
 
 printf("Reset successfuln");

 close(fd);
 return 0;

The run the following commands in terminal:

Compile the program:
```
$ cc usbreset.c -o usbreset
```

Get the Bus and Device ID of the USB device you want to reset:
```
$ lsusb 
Bus 002 Device 003: ID 0fe9:9010 DVICO 
```

Make our compiled program executable:
```
$ chmod +x usbreset
```

Execute the program with sudo privilege; make necessary substitution for <Bus> and <Device> ids as found by running the lsusb command:
```
$ sudo ./usbreset /dev/bus/usb/002/003 
```

Source of above program: http://marc.info/?l=linux-usb&m=121459435621262&w=2

I got errors like this: ./usbreset: command not found Dan 11.04 Natty — user24895, Sep 13 '11 at 4:33
This works with ubuntu 13.10. The device ID can vary. TO get it for the mouse I have wrapped above code in few shell commands echo $(lsusb | grep Mouse) mouse=$( lsusb | grep Mouse | perl -nE "/D+(d+)D+(d+).+/; print qq($1/$2)") sudo /path/to/c-program/usbreset /dev/bus/usb/$mouse — Dec 22 '13 at 11:04
my external drive seems to become undetectable (I have to hard reconnect the usb cable); it is a usb2.0 connected on a usb3.0 desktop PC port; when I run usbreset /dev/bus/usb/011/001 that is one of the 2 usb 3.0 root hubs at lsusb, it errors: "Error in ioctl: Is a directory", any ideia? I tried on both usb 3.0 hubs — Oct 30 '14 at 3:34
If anyone reading this have a (usb) mouse freeze after logging in on Ubuntu 16.04 (with dmesg filled by "input irq status -75") , i can confirm that this is the only solution that worked for me. Thank you — May 2 '16 at 12:31
@ Aquarius, I also get the same error "Error in ioctl: Is a directory". Is it resolved ? — Feb 12 '17 at 13:21

muru 1 · Accepted Answer · 2016-06-04 12:50:22Z

I haven't found myself in your specific circumstances before, so I'm not sure if it'll do enough, but the simplest way I've found to reset a USB device is this command: (No external apps necessary)

sudo sh -c "echo 0 > /sys/bus/usb/devices/1-4.6/authorized"
sudo sh -c "echo 1 > /sys/bus/usb/devices/1-4.6/authorized"

That's the actual one I use to reset my Kinect since libfreenect seems to have no API for putting it back to sleep. It's on my Gentoo box, but the kernel should be new enough to use the same path structure for sysfs.

Yours obviously wouldn't be 1-4.6 but you can either pull that device path from your kernel log (dmesg) or you can use something like lsusb to get the vendor and product IDs and then use a quick command like this to list how the paths relate to different vendor/product ID pairs:

for X in /sys/bus/usb/devices/*; do 
 echo "$X"
 cat "$X/idVendor" 2>/dev/null 
 cat "$X/idProduct" 2>/dev/null
 echo
done

sh: 1: cannot create /sys/bus/usb/devices/1-3.1:1.0/authorized: Directory nonexistent — May 31 '12 at 3:22
It looks like they've changed the layout of the usbfs filesystem. I'll try to figure out what the new way of doing things is on Ubuntu once I'm not so sleepy. — Jun 2 '12 at 15:46
Thank you worked great! Maybe you should also mention to perform a echo 1 > /sys/bus/usb/devices/whatever/authorized inside a script to re-enable the device as soon as it has been disabled. I did it on both my mouse and usb keyboard and I ended up with a completely deaf system :) — Apr 28 '13 at 8:43
It's extremely strange if it automatically re-set the value to 1 as setting it to 0 is telling the system you don't want the device to be "authorized" and therefore inaccessible. — Oct 18 '13 at 19:45
A note for anyone who tries to switch to the | sudo tee ... approach to privileged /sys writes: That breaks badly if you don't already have your sudo credentials cached. sudo sh -c "..." works as expected when sudo needs to prompt for a password. — Jun 5 '16 at 10:40

fresskoma 1034 · Accepted Answer · 2018-07-31 18:25:06Z

This will reset all of USB1/2/3 attached ports[1]:

for i in /sys/bus/pci/drivers/[uoex]hci_hcd/*:*; do
 [ -e "$i" ] || continue
 echo "$i##*/" > "$i%/*/unbind"
 echo "$i##*/" > "$i%/*/bind"
done

I believe this will solve your problem. If you do not want to reset all of the USB endpoints, you can use appropriate device ID from /sys/bus/pci/drivers/ehci_hcd

Notes:
[1]: the *hci_hcd kernel drivers typically control the USB ports. ohci_hcd and uhci_hcd are for USB1.1 ports, ehci_hcd is for USB2 ports and xhci_hcd is for USB3 ports. (see https://en.wikipedia.org/wiki/Host_controller_interface_(USB,_Firewire))

Although I've received the following message: ls: cannot access /sys/bus/pci/drivers/ehci_hcd/: No such file or directory this has resolved the issue, the mouse has started working immediately. +1 — Oct 10 '14 at 6:16
@Otheus OHCI and UHCI are the USB 1.1 host standards, EHCI is the USB 2.0 host standard, and XHCI is the USB 3.0 host standard. — Jul 20 '16 at 19:02
This is a beautiful solution. However, on some later Kernels and other *nix distributions, you will find that you need to substitute *hci_hcd with *hci-pci, as the hci_hcd driver is already compiled into the Kernel. — Mar 1 '17 at 17:14
On a Banana Pi, there apparently is no PCI bus, I had to use the following: for i in /sys/bus/usb/drivers/*/*:*; do — Jun 29 '17 at 9:14

David Foerster 28.5k1366112 · Accepted Answer · 2016-11-09 18:37:35Z

I needed to automate this in a python script, so I adapted LiLo's extremely helpful answer to the following:

#!/usr/bin/env python
import os
import sys
from subprocess import Popen, PIPE
import fcntl
driver = sys.argv[-1]
print "resetting driver:", driver
USBDEVFS_RESET= 21780

try:
 lsusb_out = Popen("lsusb | grep -i %s"%driver, shell=True, bufsize=64, stdin=PIPE, stdout=PIPE, close_fds=True).stdout.read().strip().split()
 bus = lsusb_out[1]
 device = lsusb_out[3][:-1]
 f = open("/dev/bus/usb/%s/%s"%(bus, device), 'w', os.O_WRONLY)
 fcntl.ioctl(f, USBDEVFS_RESET, 0)
except Exception, msg:
 print "failed to reset device:", msg

In my case it was the cp210x driver (which I could tell from lsmod | grep usbserial), so you could save the above snippet as reset_usb.py and then do this:

sudo python reset_usb.py cp210x

This might also be helpful if you don't already have a c compiler setup on your system, but you do have python.

A few more words on your solution please. For example, something about the constant USBDEVFS_RESET. Is it always the same for all systems? — Feb 28 '17 at 7:25
@not2qubit USBDEVFS_RESET is the same for all systems. For MIPS it is 536892692. — Apr 21 '17 at 9:09
Newer versions of lsusb seem to need the -t argument (tree mode) to show the driver info that this script is expecting, but the script then needs some updates to parse the different output lines this generates — Oct 19 '17 at 18:56
See my answer here askubuntu.com/a/988297/558070 for a much improved version of this script. — Dec 21 '17 at 10:30

score 4 · Accepted Answer · 2016-01-16 09:21:02Z

I'm using kind of sledgehammer by reloading the modules.
This is my usb_reset.sh script:

#!/bin/bash

# USB drivers
rmmod xhci_pci
rmmod ehci_pci

# uncomment if you have firewire
#rmmod ohci_pci

modprobe xhci_pci
modprobe ehci_pci

# uncomment if you have firewire
#modprobe ohci_pci

And this is my systemd service file /usr/lib/systemd/system/usbreset.service which runs usb_reset.sh after my diplay manager has started:

[Unit]
Description=usbreset Service
After=gdm.service
Wants=gdm.service

[Service]
Type=oneshot
ExecStart=/path/to/usb_reset.sh

Using the listpci option of my script here: askubuntu.com/a/988297/558070 will help identify which USB module to reload (eg. xhci_pci, ehci_pci). — Jan 24 '18 at 15:14
Unfortunately on my system these kernel modules are not separate form the kernel, so this won't work: rmmod: ERROR: Module xhci_pci is builtin. — Jun 28 '18 at 13:00

score 4 · Accepted Answer · 2016-08-31 18:49:55Z

As the special case of the question is a communication problem of gphoto2 with a camera on USB, there is an option in gphoto2 to reset its USB connection:

gphoto2 --reset

Maybe this option didn't exist in 2010 when the question was asked.

chandankchandank 259412 · Accepted Answer · 2014-11-24 19:34:38Z

Quickest way to reset will be to reset the USB controller itself. Doing so will enforce udev to unregister the device on disconnection, and register is back once you enable it.

echo -n "0000:00:1a.0" | tee /sys/bus/pci/drivers/ehci_hcd/unbind
echo -n "0000:00:1d.0" | tee /sys/bus/pci/drivers/ehci_hcd/unbind
echo -n "0000:00:1a.0" | tee /sys/bus/pci/drivers/ehci_hcd/bind
echo -n "0000:00:1d.0" | tee /sys/bus/pci/drivers/ehci_hcd/bind

This should work for most PC environment. However, if you are using some custom hardware you can simply iterate through the device names. With this method you don't need to find out the device name by lsusb. You can incorporate in a automated script as well.

You need to run these commands as root/sudo, and it will not work on all systems (on some, you'll need to replace ehci_hcd with ehci-pci. More info on this solution (perhaps where it came from?): davidjb.com/blog/2012/06/… — Nov 5 '15 at 17:43

Jonathon Reinhart 1033 · Accepted Answer · 2016-12-19 22:05:19Z

I made a python script which will reset a particular USB device based on the device number. You can find out the device number from command lsusb.

for example:

$ lsusb

Bus 002 Device 004: ID 046d:c312 Logitech, Inc. DeLuxe 250 Keyboard

In this string 004 is the device number

import os
import argparse
import subprocess

path='/sys/bus/usb/devices/'

def runbash(cmd):
 p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
 out = p.stdout.read().strip()
 return out

def reset_device(dev_num):
 sub_dirs = []
 for root, dirs, files in os.walk(path):
 for name in dirs:
 sub_dirs.append(os.path.join(root, name))

 dev_found = 0
 for sub_dir in sub_dirs:
 if True == os.path.isfile(sub_dir+'/devnum'):
 fd = open(sub_dir+'/devnum','r')
 line = fd.readline()
 if int(dev_num) == int(line):
 print ('Your device is at: '+sub_dir)
 dev_found = 1
 break

 fd.close()

 if dev_found == 1:
 reset_file = sub_dir+'/authorized'
 runbash('echo 0 > '+reset_file) 
 runbash('echo 1 > '+reset_file) 
 print ('Device reset successful')

 else:
 print ("No such device")

def main():
 parser = argparse.ArgumentParser()
 parser.add_argument('-d', '--devnum', dest='devnum')
 args = parser.parse_args()

 if args.devnum is None:
 print('Usage:usb_reset.py -d <device_number> nThe device number can be obtained from lsusb command result')
 return

 reset_device(args.devnum)

if __name__=='__main__':
 main()

derHugo 2,32521531 · Accepted Answer · 2017-11-21 11:32:42Z

Here is script that will only reset a matching product/vendor ID.

#!/bin/bash

set -euo pipefail
IFS=$'nt'

VENDOR="045e"
PRODUCT="0719"

for DIR in $(find /sys/bus/usb/devices/ -maxdepth 1 -type l); do
 if [[ -f $DIR/idVendor && -f $DIR/idProduct &&
 $(cat $DIR/idVendor) == $VENDOR && $(cat $DIR/idProduct) == $PRODUCT ]]; then
 echo 0 > $DIR/authorized
 sleep 0.5
 echo 1 > $DIR/authorized
 fi
done

I found your script is useful. But what should I do if the $DIR disappears and device is not visible? — Oct 13 '17 at 7:36

Pablo Bianchi 2,94521535 · Accepted Answer · 2019-03-15 22:47:42Z

I've created a Python script that simplifies the whole process based on answers here.

Save the script below as reset_usb.py or clone this repo.

Usage:

python reset_usb.py help # Show this help
sudo python reset_usb.py list # List all USB devices
sudo python reset_usb.py path /dev/bus/usb/XXX/YYY # Reset USB device using path /dev/bus/usb/XXX/YYY
sudo python reset_usb.py search "search terms" # Search for USB device using the search terms within the search string returned by list and reset matching device
sudo python reset_usb.py listpci # List all PCI USB devices
sudo python reset_usb.py pathpci /sys/bus/pci/drivers/.../XXXX:XX:XX.X # Reset PCI USB device using path /sys/bus/pci/drivers/.../XXXX:XX:XX.X
sudo python reset_usb.py searchpci "search terms" # Search for PCI USB device using the search terms within the search string returned by listpci and reset matching device

Script:

#!/usr/bin/env python
import os
import sys
from subprocess import Popen, PIPE
import fcntl

instructions = '''
Usage: python reset_usb.py help : Show this help
 sudo python reset_usb.py list : List all USB devices
 sudo python reset_usb.py path /dev/bus/usb/XXX/YYY : Reset USB device using path /dev/bus/usb/XXX/YYY
 sudo python reset_usb.py search "search terms" : Search for USB device using the search terms within the search string returned by list and reset matching device
 sudo python reset_usb.py listpci : List all PCI USB devices
 sudo python reset_usb.py pathpci /sys/bus/pci/drivers/.../XXXX:XX:XX.X : Reset PCI USB device using path
 sudo python reset_usb.py searchpci "search terms" : Search for PCI USB device using the search terms within the search string returned by listpci and reset matching device 
 '''


if len(sys.argv) < 2:
 print(instructions)
 sys.exit(0)

option = sys.argv[1].lower()
if 'help' in option:
 print(instructions)
 sys.exit(0)


def create_pci_list():
 pci_usb_list = list()
 try:
 lspci_out = Popen('lspci -Dvmm', shell=True, bufsize=64, stdin=PIPE, stdout=PIPE, close_fds=True).stdout.read().strip().decode('utf-8')
 pci_devices = lspci_out.split('%s%s' % (os.linesep, os.linesep))
 for pci_device in pci_devices:
 device_dict = dict()
 categories = pci_device.split(os.linesep)
 for category in categories:
 key, value = category.split('t')
 device_dict[key[:-1]] = value.strip()
 if 'USB' not in device_dict['Class']:
 continue
 for root, dirs, files in os.walk('/sys/bus/pci/drivers/'):
 slot = device_dict['Slot']
 if slot in dirs:
 device_dict['path'] = os.path.join(root, slot)
 break
 pci_usb_list.append(device_dict)
 except Exception as ex:
 print('Failed to list pci devices! Error: %s' % ex)
 sys.exit(-1)
 return pci_usb_list


def create_usb_list():
 device_list = list()
 try:
 lsusb_out = Popen('lsusb -v', shell=True, bufsize=64, stdin=PIPE, stdout=PIPE, close_fds=True).stdout.read().strip().decode('utf-8')
 usb_devices = lsusb_out.split('%s%s' % (os.linesep, os.linesep))
 for device_categories in usb_devices:
 if not device_categories:
 continue
 categories = device_categories.split(os.linesep)
 device_stuff = categories[0].strip().split()
 bus = device_stuff[1]
 device = device_stuff[3][:-1]
 device_dict = 'bus': bus, 'device': device
 device_info = ' '.join(device_stuff[6:])
 device_dict['description'] = device_info
 for category in categories:
 if not category:
 continue
 categoryinfo = category.strip().split()
 if categoryinfo[0] == 'iManufacturer':
 manufacturer_info = ' '.join(categoryinfo[2:])
 device_dict['manufacturer'] = manufacturer_info
 if categoryinfo[0] == 'iProduct':
 device_info = ' '.join(categoryinfo[2:])
 device_dict['device'] = device_info
 path = '/dev/bus/usb/%s/%s' % (bus, device)
 device_dict['path'] = path

 device_list.append(device_dict)
 except Exception as ex:
 print('Failed to list usb devices! Error: %s' % ex)
 sys.exit(-1)
 return device_list


if 'listpci' in option:
 pci_usb_list = create_pci_list()
 for device in pci_usb_list:
 print('path=%s' % device['path'])
 print(' manufacturer=%s' % device['SVendor'])
 print(' device=%s' % device['SDevice'])
 print(' search string=%s %s' % (device['SVendor'], device['SDevice']))
 sys.exit(0)

if 'list' in option:
 usb_list = create_usb_list()
 for device in usb_list:
 print('path=%s' % device['path'])
 print(' description=%s' % device['description'])
 print(' manufacturer=%s' % device['manufacturer'])
 print(' device=%s' % device['device'])
 print(' search string=%s %s %s' % (device['description'], device['manufacturer'], device['device']))
 sys.exit(0)

if len(sys.argv) < 3:
 print(instructions)
 sys.exit(0)

option2 = sys.argv[2]

print('Resetting device: %s' % option2)


# echo -n "0000:39:00.0" | tee /sys/bus/pci/drivers/xhci_hcd/unbind;echo -n "0000:39:00.0" | tee /sys/bus/pci/drivers/xhci_hcd/bind
def reset_pci_usb_device(dev_path):
 folder, slot = os.path.split(dev_path)
 try:
 fp = open(os.path.join(folder, 'unbind'), 'wt')
 fp.write(slot)
 fp.close()
 fp = open(os.path.join(folder, 'bind'), 'wt')
 fp.write(slot)
 fp.close()
 print('Successfully reset %s' % dev_path)
 sys.exit(0)
 except Exception as ex:
 print('Failed to reset device! Error: %s' % ex)
 sys.exit(-1)


if 'pathpci' in option:
 reset_pci_usb_device(option2)


if 'searchpci' in option:
 pci_usb_list = create_pci_list()
 for device in pci_usb_list:
 text = '%s %s' % (device['SVendor'], device['SDevice'])
 if option2 in text:
 reset_pci_usb_device(device['path'])
 print('Failed to find device!')
 sys.exit(-1)


def reset_usb_device(dev_path):
 USBDEVFS_RESET = 21780
 try:
 f = open(dev_path, 'w', os.O_WRONLY)
 fcntl.ioctl(f, USBDEVFS_RESET, 0)
 print('Successfully reset %s' % dev_path)
 sys.exit(0)
 except Exception as ex:
 print('Failed to reset device! Error: %s' % ex)
 sys.exit(-1)


if 'path' in option:
 reset_usb_device(option2)


if 'search' in option:
 usb_list = create_usb_list()
 for device in usb_list:
 text = '%s %s %s' % (device['description'], device['manufacturer'], device['device'])
 if option2 in text:
 reset_usb_device(device['path'])
 print('Failed to find device!')
 sys.exit(-1)

derHugo 2,32521531 · Accepted Answer · 2017-11-21 11:32:39Z

1

Did somebody order a sledgehammer? This is pieced together from various other answers here.

#!/bin/bash

# Root required
if (( UID )); then
 exec sudo "$0" "$@"
fi

cd /sys/bus/pci/drivers

function reinit (
 local d="$1"
 test -e "$d" 

for d in ?hci_???; do
 echo " - $d"
 reinit "$d"
done

edited Nov 21 '17 at 11:32

derHugo

2,32521531

answered Jun 28 '16 at 14:08

Mark K Cowan

1528

Mark, have you found that the unbinding is really necessary or is it here just to be on the safe side?

– ndemou
Nov 10 '16 at 14:27

This is a sledgehammer, it probably does a lot of unnecessary things

– Mark K Cowan
Nov 10 '16 at 14:37

@MarkKCowan , How do you use it? What are the command arguments needed/expected?

– not2qubit
Feb 28 '17 at 7:15

1

@not2qubit: No command-line arguments required. The $@ in the sudo proxy is just a force of habbit, having it prevents bugs if I later decide to add arguments (and forget to update the sudo proxy).

– Mark K Cowan
Nov 21 '17 at 14:54

1

@MarkKCowan Doh! Sorry mate! Oh yes of curse! I should not be commenting on this site while sleepy. Upvoted!

– not2qubit
Nov 21 '17 at 16:29

|
show 2 more comments

derHugo 2,32521531 · Accepted Answer · 2017-11-21 11:32:44Z

Sometimes I want to perform this operation on a particular device, as identified by VID (vendor id) and PID (product id). This is a script I've found useful for this purpose, that uses the nifty libusb library.

First run:

sudo apt-get install libusb-dev

Then, this c++ file's resetDeviceConnection should perform this task, of resetting a device connection as identified by vid and pid.

#include <libusb-1.0/libusb.h>

int resetDeviceConnection(UINT_16 vid, UINT_16 pid)
 /*Open libusb*/
 int resetStatus = 0;
 libusb_context * context;
 libusb_init(&context);

 libusb_device_handle * dev_handle = libusb_open_device_with_vid_pid(context,vid,pid);
 if (dev_handle == NULL)
 printf("usb resetting unsuccessful! No matching device found, or error encountered!n");
 resetStatus = 1;
 
 else
 /*reset the device, if one was found*/
 resetStatus = libusb_reset_device(dev_handle);
 
 /*exit libusb*/
 libusb_exit(context);
 return resetStatus;

(stolen from my personal TIL catalog:
https://github.com/Marviel/TIL/blob/master/unix_tools/Reset_specific_USB_Device.md)

Please can you show how this script is run.

– George Udosen
Dec 29 '16 at 14:28 — Dec 29 '16 at 14:28
@Marviel, we're still waiting for an update...

– not2qubit
Feb 28 '17 at 7:18 — Feb 28 '17 at 7:18
needs downvote as useless

– Eugen Konkov
Oct 13 '17 at 7:36 — Oct 13 '17 at 7:36

TinoTino 44147 · Accepted Answer · 2013-06-06 00:08:02Z

Perhaps this works for a camera, too:

Following revived a starved USB 3.0 HDD on a 3.4.42 (kernel.org) Linux on my side. dmesg told, that it was timing out commands after 360s (sorry, I cannot copy the syslog here, not connected networks) and the drive hung completely. Processes accessing the device were blocked in the kernel, unkillable. NFS hung, ZFS hung, dd hung.

After doing this, everything worked again. dmesg told just a single line about the USB device found.

I really have no idea what following does in detail. But it worked.

The following example output is from Debian Squeeze with 2.6.32-5-686 kernel, so I think it works for 2.6 and above:

$ ls -al /dev/sdb
brw-rw---T 1 root floppy 8, 16 Jun 3 20:24 /dev/sdb

$ ls -al /sys/dev/block/8:16/device/rescan
--w------- 1 root root 4096 Jun 6 01:46 /sys/dev/block/8:16/device/rescan

$ echo 1 > /sys/dev/block/8:16/device/rescan

If this does not work, perhaps somebody else can figure out how to send a real reset to a device.

user242078user242078 1 · Accepted Answer · 2014-01-31 11:15:52Z

Try this, it's a software unplug (Eject).

Sometimes doesn't work simply unbind device for some devices.

Example:

I want to remove or eject my "Genius NetScroll 120".

Then i first Check my attached usb device

$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 03f0:231d Hewlett-Packard 
Bus 001 Device 004: ID 138a:0007 Validity Sensors, Inc. VFS451 Fingerprint Reader
Bus 001 Device 005: ID 04f2:b163 Chicony Electronics Co., Ltd 
Bus 002 Device 009: ID 0458:003a KYE Systems Corp. (Mouse Systems) NetScroll+ Mini Traveler / Genius NetScroll 120 **<----This my Mouse! XDDD**

Ok, i found my mouse, it's has a Bus 002, Device 009, idVendor 0458 and idProduct 003a, so this is a reference device info about the mouse.

This is important, the Bus number is the begin name path to device and i will check the product Id and Vendor to ensure the correct device to remove.

$ ls /sys/bus/usb/drivers/usb/
1-1/ 1-1.1/ 1-1.3/ 1-1.5/ 2-1/ 2-1.3/ bind uevent unbind usb1/ usb2/

Pay atention on the folders, check the begining with folder number 2, i will check this one because my Bus is 002, and one by one i have check each folder containing the correct idVendor and idProduct about my mouse info.

In this case, i will retrieve the info with this command:

cat /sys/bus/usb/drivers/usb/2-1.3/idVendor
0458
cat /sys/bus/usb/drivers/usb/2-1.3/idProduct
003a

Ok, the path /sys/bus/usb/drivers/usb/2-1.3/ match with my info mouse! XDDD.

It's time to remove the device!

su -c "echo 1 > /sys/bus/usb/drivers/usb/2-1.3/remove"

Plug again the usb device and it's work again!

What if you can't plug it in again? (for example it's an internal sdcard reader) — Jun 29 '14 at 20:57

derHugo 2,32521531 · Accepted Answer · 2017-11-21 11:42:10Z

If you know your device name, this python script will work:

#!/usr/bin/python
"""
USB Reset

Call as "usbreset.py <device_file_path>"

With device_file_path like "/dev/bus/usb/bus_number/device_number"
"""
import fcntl, sys, os

USBDEVFS_RESET = ord('U') << (4*2) | 20

def main():
 fd = os.open(sys.argv[1], os.O_WRONLY)
 if fd < 0: sys.exit(1)
 fcntl.ioctl(fd, USBDEVFS_RESET, 0)
 os.close(fd)
 sys.exit(0)
# end main

if __name__ == '__main__':
 main()

Olorin 2,656924 · Accepted Answer · 2019-01-21 12:26:20Z

i made a simple bash script for reset particular USB device.

#!/bin/bash
#type lsusb to find "vendor" and "product" ID in terminal
set -euo pipefail
IFS=$'nt'

#edit the below two lines of vendor and product values using lsusb result
dev=$(lsusb -t | grep usbdevicename | grep 'If 1' | cut -d' ' -f13|cut -d"," -f1)
#VENDOR=05a3
#PRODUCT=9230
VENDOR=$(lsusb -s $dev | cut -d' ' -f6 | cut -d: -f1)
PRODUCT=$(lsusb -s $dev | cut -d' ' -f6 | cut -d: -f2)

for DIR in $(find /sys/bus/usb/devices/ -maxdepth 1 -type l); do
 if [[ -f $DIR/idVendor && -f $DIR/idProduct &&
 $(cat $DIR/idVendor) == $VENDOR && $(cat $DIR/idProduct) == $PRODUCT ]]; then
 echo 0 > $DIR/authorized
 sleep 0.5
 echo 1 > $DIR/authorized
 fi
done

Aditya 9,388125589 · Accepted Answer · 2013-10-20 22:07:36Z

Save the following as usbreset.c

/* usbreset -- send a USB port reset to a USB device */

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>

#include <linux/usbdevice_fs.h>


int main(int argc, char **argv)

 const char *filename;
 int fd;
 int rc;

 if (argc != 2) 
 fprintf(stderr, "Usage: usbreset device-filenamen");
 return 1;
 
 filename = argv[1];

 fd = open(filename, O_WRONLY);
 if (fd < 0) 
 perror("Error opening output file");
 return 1;
 

 printf("Resetting USB device %sn", filename);
 rc = ioctl(fd, USBDEVFS_RESET, 0);
 if (rc < 0) 
 perror("Error in ioctl");
 return 1;
 
 printf("Reset successfuln");

 close(fd);
 return 0;

The run the following commands in terminal:

Compile the program:
```
$ cc usbreset.c -o usbreset
```

Get the Bus and Device ID of the USB device you want to reset:
```
$ lsusb 
Bus 002 Device 003: ID 0fe9:9010 DVICO 
```

Make our compiled program executable:
```
$ chmod +x usbreset
```

Execute the program with sudo privilege; make necessary substitution for <Bus> and <Device> ids as found by running the lsusb command:
```
$ sudo ./usbreset /dev/bus/usb/002/003 
```

Source of above program: http://marc.info/?l=linux-usb&m=121459435621262&w=2

I got errors like this: ./usbreset: command not found Dan 11.04 Natty — user24895, Sep 13 '11 at 4:33
This works with ubuntu 13.10. The device ID can vary. TO get it for the mouse I have wrapped above code in few shell commands echo $(lsusb | grep Mouse) mouse=$( lsusb | grep Mouse | perl -nE "/D+(d+)D+(d+).+/; print qq($1/$2)") sudo /path/to/c-program/usbreset /dev/bus/usb/$mouse — Dec 22 '13 at 11:04
my external drive seems to become undetectable (I have to hard reconnect the usb cable); it is a usb2.0 connected on a usb3.0 desktop PC port; when I run usbreset /dev/bus/usb/011/001 that is one of the 2 usb 3.0 root hubs at lsusb, it errors: "Error in ioctl: Is a directory", any ideia? I tried on both usb 3.0 hubs — Oct 30 '14 at 3:34
If anyone reading this have a (usb) mouse freeze after logging in on Ubuntu 16.04 (with dmesg filled by "input irq status -75") , i can confirm that this is the only solution that worked for me. Thank you — May 2 '16 at 12:31
@ Aquarius, I also get the same error "Error in ioctl: Is a directory". Is it resolved ? — Feb 12 '17 at 13:21

muru 1 · Accepted Answer · 2016-06-04 12:50:22Z

I haven't found myself in your specific circumstances before, so I'm not sure if it'll do enough, but the simplest way I've found to reset a USB device is this command: (No external apps necessary)

sudo sh -c "echo 0 > /sys/bus/usb/devices/1-4.6/authorized"
sudo sh -c "echo 1 > /sys/bus/usb/devices/1-4.6/authorized"

That's the actual one I use to reset my Kinect since libfreenect seems to have no API for putting it back to sleep. It's on my Gentoo box, but the kernel should be new enough to use the same path structure for sysfs.

Yours obviously wouldn't be 1-4.6 but you can either pull that device path from your kernel log (dmesg) or you can use something like lsusb to get the vendor and product IDs and then use a quick command like this to list how the paths relate to different vendor/product ID pairs:

for X in /sys/bus/usb/devices/*; do 
 echo "$X"
 cat "$X/idVendor" 2>/dev/null 
 cat "$X/idProduct" 2>/dev/null
 echo
done

sh: 1: cannot create /sys/bus/usb/devices/1-3.1:1.0/authorized: Directory nonexistent — May 31 '12 at 3:22
It looks like they've changed the layout of the usbfs filesystem. I'll try to figure out what the new way of doing things is on Ubuntu once I'm not so sleepy. — Jun 2 '12 at 15:46
Thank you worked great! Maybe you should also mention to perform a echo 1 > /sys/bus/usb/devices/whatever/authorized inside a script to re-enable the device as soon as it has been disabled. I did it on both my mouse and usb keyboard and I ended up with a completely deaf system :) — Apr 28 '13 at 8:43
It's extremely strange if it automatically re-set the value to 1 as setting it to 0 is telling the system you don't want the device to be "authorized" and therefore inaccessible. — Oct 18 '13 at 19:45
A note for anyone who tries to switch to the | sudo tee ... approach to privileged /sys writes: That breaks badly if you don't already have your sudo credentials cached. sudo sh -c "..." works as expected when sudo needs to prompt for a password. — Jun 5 '16 at 10:40

fresskoma 1034 · Accepted Answer · 2018-07-31 18:25:06Z

This will reset all of USB1/2/3 attached ports[1]:

for i in /sys/bus/pci/drivers/[uoex]hci_hcd/*:*; do
 [ -e "$i" ] || continue
 echo "$i##*/" > "$i%/*/unbind"
 echo "$i##*/" > "$i%/*/bind"
done

I believe this will solve your problem. If you do not want to reset all of the USB endpoints, you can use appropriate device ID from /sys/bus/pci/drivers/ehci_hcd

Notes:
[1]: the *hci_hcd kernel drivers typically control the USB ports. ohci_hcd and uhci_hcd are for USB1.1 ports, ehci_hcd is for USB2 ports and xhci_hcd is for USB3 ports. (see https://en.wikipedia.org/wiki/Host_controller_interface_(USB,_Firewire))

Although I've received the following message: ls: cannot access /sys/bus/pci/drivers/ehci_hcd/: No such file or directory this has resolved the issue, the mouse has started working immediately. +1 — Oct 10 '14 at 6:16
@Otheus OHCI and UHCI are the USB 1.1 host standards, EHCI is the USB 2.0 host standard, and XHCI is the USB 3.0 host standard. — Jul 20 '16 at 19:02
This is a beautiful solution. However, on some later Kernels and other *nix distributions, you will find that you need to substitute *hci_hcd with *hci-pci, as the hci_hcd driver is already compiled into the Kernel. — Mar 1 '17 at 17:14
On a Banana Pi, there apparently is no PCI bus, I had to use the following: for i in /sys/bus/usb/drivers/*/*:*; do — Jun 29 '17 at 9:14

David Foerster 28.5k1366112 · Accepted Answer · 2016-11-09 18:37:35Z

I needed to automate this in a python script, so I adapted LiLo's extremely helpful answer to the following:

#!/usr/bin/env python
import os
import sys
from subprocess import Popen, PIPE
import fcntl
driver = sys.argv[-1]
print "resetting driver:", driver
USBDEVFS_RESET= 21780

try:
 lsusb_out = Popen("lsusb | grep -i %s"%driver, shell=True, bufsize=64, stdin=PIPE, stdout=PIPE, close_fds=True).stdout.read().strip().split()
 bus = lsusb_out[1]
 device = lsusb_out[3][:-1]
 f = open("/dev/bus/usb/%s/%s"%(bus, device), 'w', os.O_WRONLY)
 fcntl.ioctl(f, USBDEVFS_RESET, 0)
except Exception, msg:
 print "failed to reset device:", msg

In my case it was the cp210x driver (which I could tell from lsmod | grep usbserial), so you could save the above snippet as reset_usb.py and then do this:

sudo python reset_usb.py cp210x

This might also be helpful if you don't already have a c compiler setup on your system, but you do have python.

A few more words on your solution please. For example, something about the constant USBDEVFS_RESET. Is it always the same for all systems? — Feb 28 '17 at 7:25
@not2qubit USBDEVFS_RESET is the same for all systems. For MIPS it is 536892692. — Apr 21 '17 at 9:09
Newer versions of lsusb seem to need the -t argument (tree mode) to show the driver info that this script is expecting, but the script then needs some updates to parse the different output lines this generates — Oct 19 '17 at 18:56
See my answer here askubuntu.com/a/988297/558070 for a much improved version of this script. — Dec 21 '17 at 10:30

score 4 · Accepted Answer · 2016-01-16 09:21:02Z

I'm using kind of sledgehammer by reloading the modules.
This is my usb_reset.sh script:

#!/bin/bash

# USB drivers
rmmod xhci_pci
rmmod ehci_pci

# uncomment if you have firewire
#rmmod ohci_pci

modprobe xhci_pci
modprobe ehci_pci

# uncomment if you have firewire
#modprobe ohci_pci

And this is my systemd service file /usr/lib/systemd/system/usbreset.service which runs usb_reset.sh after my diplay manager has started:

[Unit]
Description=usbreset Service
After=gdm.service
Wants=gdm.service

[Service]
Type=oneshot
ExecStart=/path/to/usb_reset.sh

Using the listpci option of my script here: askubuntu.com/a/988297/558070 will help identify which USB module to reload (eg. xhci_pci, ehci_pci). — Jan 24 '18 at 15:14
Unfortunately on my system these kernel modules are not separate form the kernel, so this won't work: rmmod: ERROR: Module xhci_pci is builtin. — Jun 28 '18 at 13:00

score 4 · Accepted Answer · 2016-08-31 18:49:55Z

As the special case of the question is a communication problem of gphoto2 with a camera on USB, there is an option in gphoto2 to reset its USB connection:

gphoto2 --reset

Maybe this option didn't exist in 2010 when the question was asked.

chandankchandank 259412 · Accepted Answer · 2014-11-24 19:34:38Z

Quickest way to reset will be to reset the USB controller itself. Doing so will enforce udev to unregister the device on disconnection, and register is back once you enable it.

echo -n "0000:00:1a.0" | tee /sys/bus/pci/drivers/ehci_hcd/unbind
echo -n "0000:00:1d.0" | tee /sys/bus/pci/drivers/ehci_hcd/unbind
echo -n "0000:00:1a.0" | tee /sys/bus/pci/drivers/ehci_hcd/bind
echo -n "0000:00:1d.0" | tee /sys/bus/pci/drivers/ehci_hcd/bind

This should work for most PC environment. However, if you are using some custom hardware you can simply iterate through the device names. With this method you don't need to find out the device name by lsusb. You can incorporate in a automated script as well.

You need to run these commands as root/sudo, and it will not work on all systems (on some, you'll need to replace ehci_hcd with ehci-pci. More info on this solution (perhaps where it came from?): davidjb.com/blog/2012/06/… — Nov 5 '15 at 17:43

Jonathon Reinhart 1033 · Accepted Answer · 2016-12-19 22:05:19Z

I made a python script which will reset a particular USB device based on the device number. You can find out the device number from command lsusb.

for example:

$ lsusb

Bus 002 Device 004: ID 046d:c312 Logitech, Inc. DeLuxe 250 Keyboard

In this string 004 is the device number

import os
import argparse
import subprocess

path='/sys/bus/usb/devices/'

def runbash(cmd):
 p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
 out = p.stdout.read().strip()
 return out

def reset_device(dev_num):
 sub_dirs = []
 for root, dirs, files in os.walk(path):
 for name in dirs:
 sub_dirs.append(os.path.join(root, name))

 dev_found = 0
 for sub_dir in sub_dirs:
 if True == os.path.isfile(sub_dir+'/devnum'):
 fd = open(sub_dir+'/devnum','r')
 line = fd.readline()
 if int(dev_num) == int(line):
 print ('Your device is at: '+sub_dir)
 dev_found = 1
 break

 fd.close()

 if dev_found == 1:
 reset_file = sub_dir+'/authorized'
 runbash('echo 0 > '+reset_file) 
 runbash('echo 1 > '+reset_file) 
 print ('Device reset successful')

 else:
 print ("No such device")

def main():
 parser = argparse.ArgumentParser()
 parser.add_argument('-d', '--devnum', dest='devnum')
 args = parser.parse_args()

 if args.devnum is None:
 print('Usage:usb_reset.py -d <device_number> nThe device number can be obtained from lsusb command result')
 return

 reset_device(args.devnum)

if __name__=='__main__':
 main()

derHugo 2,32521531 · Accepted Answer · 2017-11-21 11:32:42Z

Here is script that will only reset a matching product/vendor ID.

#!/bin/bash

set -euo pipefail
IFS=$'nt'

VENDOR="045e"
PRODUCT="0719"

for DIR in $(find /sys/bus/usb/devices/ -maxdepth 1 -type l); do
 if [[ -f $DIR/idVendor && -f $DIR/idProduct &&
 $(cat $DIR/idVendor) == $VENDOR && $(cat $DIR/idProduct) == $PRODUCT ]]; then
 echo 0 > $DIR/authorized
 sleep 0.5
 echo 1 > $DIR/authorized
 fi
done

I found your script is useful. But what should I do if the $DIR disappears and device is not visible? — Oct 13 '17 at 7:36

Pablo Bianchi 2,94521535 · Accepted Answer · 2019-03-15 22:47:42Z

I've created a Python script that simplifies the whole process based on answers here.

Save the script below as reset_usb.py or clone this repo.

Usage:

python reset_usb.py help # Show this help
sudo python reset_usb.py list # List all USB devices
sudo python reset_usb.py path /dev/bus/usb/XXX/YYY # Reset USB device using path /dev/bus/usb/XXX/YYY
sudo python reset_usb.py search "search terms" # Search for USB device using the search terms within the search string returned by list and reset matching device
sudo python reset_usb.py listpci # List all PCI USB devices
sudo python reset_usb.py pathpci /sys/bus/pci/drivers/.../XXXX:XX:XX.X # Reset PCI USB device using path /sys/bus/pci/drivers/.../XXXX:XX:XX.X
sudo python reset_usb.py searchpci "search terms" # Search for PCI USB device using the search terms within the search string returned by listpci and reset matching device

Script:

#!/usr/bin/env python
import os
import sys
from subprocess import Popen, PIPE
import fcntl

instructions = '''
Usage: python reset_usb.py help : Show this help
 sudo python reset_usb.py list : List all USB devices
 sudo python reset_usb.py path /dev/bus/usb/XXX/YYY : Reset USB device using path /dev/bus/usb/XXX/YYY
 sudo python reset_usb.py search "search terms" : Search for USB device using the search terms within the search string returned by list and reset matching device
 sudo python reset_usb.py listpci : List all PCI USB devices
 sudo python reset_usb.py pathpci /sys/bus/pci/drivers/.../XXXX:XX:XX.X : Reset PCI USB device using path
 sudo python reset_usb.py searchpci "search terms" : Search for PCI USB device using the search terms within the search string returned by listpci and reset matching device 
 '''


if len(sys.argv) < 2:
 print(instructions)
 sys.exit(0)

option = sys.argv[1].lower()
if 'help' in option:
 print(instructions)
 sys.exit(0)


def create_pci_list():
 pci_usb_list = list()
 try:
 lspci_out = Popen('lspci -Dvmm', shell=True, bufsize=64, stdin=PIPE, stdout=PIPE, close_fds=True).stdout.read().strip().decode('utf-8')
 pci_devices = lspci_out.split('%s%s' % (os.linesep, os.linesep))
 for pci_device in pci_devices:
 device_dict = dict()
 categories = pci_device.split(os.linesep)
 for category in categories:
 key, value = category.split('t')
 device_dict[key[:-1]] = value.strip()
 if 'USB' not in device_dict['Class']:
 continue
 for root, dirs, files in os.walk('/sys/bus/pci/drivers/'):
 slot = device_dict['Slot']
 if slot in dirs:
 device_dict['path'] = os.path.join(root, slot)
 break
 pci_usb_list.append(device_dict)
 except Exception as ex:
 print('Failed to list pci devices! Error: %s' % ex)
 sys.exit(-1)
 return pci_usb_list


def create_usb_list():
 device_list = list()
 try:
 lsusb_out = Popen('lsusb -v', shell=True, bufsize=64, stdin=PIPE, stdout=PIPE, close_fds=True).stdout.read().strip().decode('utf-8')
 usb_devices = lsusb_out.split('%s%s' % (os.linesep, os.linesep))
 for device_categories in usb_devices:
 if not device_categories:
 continue
 categories = device_categories.split(os.linesep)
 device_stuff = categories[0].strip().split()
 bus = device_stuff[1]
 device = device_stuff[3][:-1]
 device_dict = 'bus': bus, 'device': device
 device_info = ' '.join(device_stuff[6:])
 device_dict['description'] = device_info
 for category in categories:
 if not category:
 continue
 categoryinfo = category.strip().split()
 if categoryinfo[0] == 'iManufacturer':
 manufacturer_info = ' '.join(categoryinfo[2:])
 device_dict['manufacturer'] = manufacturer_info
 if categoryinfo[0] == 'iProduct':
 device_info = ' '.join(categoryinfo[2:])
 device_dict['device'] = device_info
 path = '/dev/bus/usb/%s/%s' % (bus, device)
 device_dict['path'] = path

 device_list.append(device_dict)
 except Exception as ex:
 print('Failed to list usb devices! Error: %s' % ex)
 sys.exit(-1)
 return device_list


if 'listpci' in option:
 pci_usb_list = create_pci_list()
 for device in pci_usb_list:
 print('path=%s' % device['path'])
 print(' manufacturer=%s' % device['SVendor'])
 print(' device=%s' % device['SDevice'])
 print(' search string=%s %s' % (device['SVendor'], device['SDevice']))
 sys.exit(0)

if 'list' in option:
 usb_list = create_usb_list()
 for device in usb_list:
 print('path=%s' % device['path'])
 print(' description=%s' % device['description'])
 print(' manufacturer=%s' % device['manufacturer'])
 print(' device=%s' % device['device'])
 print(' search string=%s %s %s' % (device['description'], device['manufacturer'], device['device']))
 sys.exit(0)

if len(sys.argv) < 3:
 print(instructions)
 sys.exit(0)

option2 = sys.argv[2]

print('Resetting device: %s' % option2)


# echo -n "0000:39:00.0" | tee /sys/bus/pci/drivers/xhci_hcd/unbind;echo -n "0000:39:00.0" | tee /sys/bus/pci/drivers/xhci_hcd/bind
def reset_pci_usb_device(dev_path):
 folder, slot = os.path.split(dev_path)
 try:
 fp = open(os.path.join(folder, 'unbind'), 'wt')
 fp.write(slot)
 fp.close()
 fp = open(os.path.join(folder, 'bind'), 'wt')
 fp.write(slot)
 fp.close()
 print('Successfully reset %s' % dev_path)
 sys.exit(0)
 except Exception as ex:
 print('Failed to reset device! Error: %s' % ex)
 sys.exit(-1)


if 'pathpci' in option:
 reset_pci_usb_device(option2)


if 'searchpci' in option:
 pci_usb_list = create_pci_list()
 for device in pci_usb_list:
 text = '%s %s' % (device['SVendor'], device['SDevice'])
 if option2 in text:
 reset_pci_usb_device(device['path'])
 print('Failed to find device!')
 sys.exit(-1)


def reset_usb_device(dev_path):
 USBDEVFS_RESET = 21780
 try:
 f = open(dev_path, 'w', os.O_WRONLY)
 fcntl.ioctl(f, USBDEVFS_RESET, 0)
 print('Successfully reset %s' % dev_path)
 sys.exit(0)
 except Exception as ex:
 print('Failed to reset device! Error: %s' % ex)
 sys.exit(-1)


if 'path' in option:
 reset_usb_device(option2)


if 'search' in option:
 usb_list = create_usb_list()
 for device in usb_list:
 text = '%s %s %s' % (device['description'], device['manufacturer'], device['device'])
 if option2 in text:
 reset_usb_device(device['path'])
 print('Failed to find device!')
 sys.exit(-1)

derHugo 2,32521531 · Accepted Answer · 2017-11-21 11:32:39Z

1

Did somebody order a sledgehammer? This is pieced together from various other answers here.

#!/bin/bash

# Root required
if (( UID )); then
 exec sudo "$0" "$@"
fi

cd /sys/bus/pci/drivers

function reinit (
 local d="$1"
 test -e "$d" 

for d in ?hci_???; do
 echo " - $d"
 reinit "$d"
done

edited Nov 21 '17 at 11:32

derHugo

2,32521531

answered Jun 28 '16 at 14:08

Mark K Cowan

1528

Mark, have you found that the unbinding is really necessary or is it here just to be on the safe side?

– ndemou
Nov 10 '16 at 14:27

This is a sledgehammer, it probably does a lot of unnecessary things

– Mark K Cowan
Nov 10 '16 at 14:37

@MarkKCowan , How do you use it? What are the command arguments needed/expected?

– not2qubit
Feb 28 '17 at 7:15

1

@not2qubit: No command-line arguments required. The $@ in the sudo proxy is just a force of habbit, having it prevents bugs if I later decide to add arguments (and forget to update the sudo proxy).

– Mark K Cowan
Nov 21 '17 at 14:54

1

@MarkKCowan Doh! Sorry mate! Oh yes of curse! I should not be commenting on this site while sleepy. Upvoted!

– not2qubit
Nov 21 '17 at 16:29

|
show 2 more comments

derHugo 2,32521531 · Accepted Answer · 2017-11-21 11:32:44Z

Sometimes I want to perform this operation on a particular device, as identified by VID (vendor id) and PID (product id). This is a script I've found useful for this purpose, that uses the nifty libusb library.

First run:

sudo apt-get install libusb-dev

Then, this c++ file's resetDeviceConnection should perform this task, of resetting a device connection as identified by vid and pid.

#include <libusb-1.0/libusb.h>

int resetDeviceConnection(UINT_16 vid, UINT_16 pid)
 /*Open libusb*/
 int resetStatus = 0;
 libusb_context * context;
 libusb_init(&context);

 libusb_device_handle * dev_handle = libusb_open_device_with_vid_pid(context,vid,pid);
 if (dev_handle == NULL)
 printf("usb resetting unsuccessful! No matching device found, or error encountered!n");
 resetStatus = 1;
 
 else
 /*reset the device, if one was found*/
 resetStatus = libusb_reset_device(dev_handle);
 
 /*exit libusb*/
 libusb_exit(context);
 return resetStatus;

(stolen from my personal TIL catalog:
https://github.com/Marviel/TIL/blob/master/unix_tools/Reset_specific_USB_Device.md)

Please can you show how this script is run.

– George Udosen
Dec 29 '16 at 14:28 — Dec 29 '16 at 14:28
@Marviel, we're still waiting for an update...

– not2qubit
Feb 28 '17 at 7:18 — Feb 28 '17 at 7:18
needs downvote as useless

– Eugen Konkov
Oct 13 '17 at 7:36 — Oct 13 '17 at 7:36

TinoTino 44147 · Accepted Answer · 2013-06-06 00:08:02Z

Perhaps this works for a camera, too:

Following revived a starved USB 3.0 HDD on a 3.4.42 (kernel.org) Linux on my side. dmesg told, that it was timing out commands after 360s (sorry, I cannot copy the syslog here, not connected networks) and the drive hung completely. Processes accessing the device were blocked in the kernel, unkillable. NFS hung, ZFS hung, dd hung.

After doing this, everything worked again. dmesg told just a single line about the USB device found.

I really have no idea what following does in detail. But it worked.

The following example output is from Debian Squeeze with 2.6.32-5-686 kernel, so I think it works for 2.6 and above:

$ ls -al /dev/sdb
brw-rw---T 1 root floppy 8, 16 Jun 3 20:24 /dev/sdb

$ ls -al /sys/dev/block/8:16/device/rescan
--w------- 1 root root 4096 Jun 6 01:46 /sys/dev/block/8:16/device/rescan

$ echo 1 > /sys/dev/block/8:16/device/rescan

If this does not work, perhaps somebody else can figure out how to send a real reset to a device.

user242078user242078 1 · Accepted Answer · 2014-01-31 11:15:52Z

Try this, it's a software unplug (Eject).

Sometimes doesn't work simply unbind device for some devices.

Example:

I want to remove or eject my "Genius NetScroll 120".

Then i first Check my attached usb device

$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 03f0:231d Hewlett-Packard 
Bus 001 Device 004: ID 138a:0007 Validity Sensors, Inc. VFS451 Fingerprint Reader
Bus 001 Device 005: ID 04f2:b163 Chicony Electronics Co., Ltd 
Bus 002 Device 009: ID 0458:003a KYE Systems Corp. (Mouse Systems) NetScroll+ Mini Traveler / Genius NetScroll 120 **<----This my Mouse! XDDD**

Ok, i found my mouse, it's has a Bus 002, Device 009, idVendor 0458 and idProduct 003a, so this is a reference device info about the mouse.

This is important, the Bus number is the begin name path to device and i will check the product Id and Vendor to ensure the correct device to remove.

$ ls /sys/bus/usb/drivers/usb/
1-1/ 1-1.1/ 1-1.3/ 1-1.5/ 2-1/ 2-1.3/ bind uevent unbind usb1/ usb2/

Pay atention on the folders, check the begining with folder number 2, i will check this one because my Bus is 002, and one by one i have check each folder containing the correct idVendor and idProduct about my mouse info.

In this case, i will retrieve the info with this command:

cat /sys/bus/usb/drivers/usb/2-1.3/idVendor
0458
cat /sys/bus/usb/drivers/usb/2-1.3/idProduct
003a

Ok, the path /sys/bus/usb/drivers/usb/2-1.3/ match with my info mouse! XDDD.

It's time to remove the device!

su -c "echo 1 > /sys/bus/usb/drivers/usb/2-1.3/remove"

Plug again the usb device and it's work again!

What if you can't plug it in again? (for example it's an internal sdcard reader) — Jun 29 '14 at 20:57

derHugo 2,32521531 · Accepted Answer · 2017-11-21 11:42:10Z

If you know your device name, this python script will work:

#!/usr/bin/python
"""
USB Reset

Call as "usbreset.py <device_file_path>"

With device_file_path like "/dev/bus/usb/bus_number/device_number"
"""
import fcntl, sys, os

USBDEVFS_RESET = ord('U') << (4*2) | 20

def main():
 fd = os.open(sys.argv[1], os.O_WRONLY)
 if fd < 0: sys.exit(1)
 fcntl.ioctl(fd, USBDEVFS_RESET, 0)
 os.close(fd)
 sys.exit(0)
# end main

if __name__ == '__main__':
 main()

Olorin 2,656924 · Accepted Answer · 2019-01-21 12:26:20Z

i made a simple bash script for reset particular USB device.

#!/bin/bash
#type lsusb to find "vendor" and "product" ID in terminal
set -euo pipefail
IFS=$'nt'

#edit the below two lines of vendor and product values using lsusb result
dev=$(lsusb -t | grep usbdevicename | grep 'If 1' | cut -d' ' -f13|cut -d"," -f1)
#VENDOR=05a3
#PRODUCT=9230
VENDOR=$(lsusb -s $dev | cut -d' ' -f6 | cut -d: -f1)
PRODUCT=$(lsusb -s $dev | cut -d' ' -f6 | cut -d: -f2)

for DIR in $(find /sys/bus/usb/devices/ -maxdepth 1 -type l); do
 if [[ -f $DIR/idVendor && -f $DIR/idProduct &&
 $(cat $DIR/idVendor) == $VENDOR && $(cat $DIR/idProduct) == $PRODUCT ]]; then
 echo 0 > $DIR/authorized
 sleep 0.5
 echo 1 > $DIR/authorized
 fi
done

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