无法声明USB接口(设备或资源繁忙)

本文介绍了无法声明USB接口(设备或资源繁忙)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想在Ubuntu 14 smarty中使用我的ACR122U非接触式智能卡读取器.因此，我安装了必需的软件包和驱动程序.

I want to use my ACR122U contact-less smart card reader in Ubuntu 14 smarty. So I installed my required packages and drivers.

最后，当我想使用阅读器时，出现以下错误:

Finally when I want to use the reader I receive the following error:

rc@rc-System-Product-Name:~/Desktop/itsme$ sudo nfc-list
[sudo] password for rc:
nfc-list uses libnfc 1.7.0
error   libnfc.driver.acr122_usb    Unable to claim USB interface (Device or resource busy)
nfc-list: ERROR: Unable to open NFC device: acr122_usb:001:020
rc@rc-System-Product-Name:~/Desktop/itsme$
rc@rc-System-Product-Name:~/Desktop/itsme$ sudo mfoc -O output.txt
error   libnfc.driver.acr122_usb    Unable to claim USB interface (Device or resource busy)
No NFC device found.
rc@rc-System-Product-Name:~/Desktop/itsme$

似乎我的读者正在使用内核工具.我搜了很多.很多人已经遇到了同样的问题，但是我在他们当中找不到答案.

It seems that my reader is in use with a kernel tool. I searched a lot. there are a lot of people that had the same issue already, but I couldn't find my answer among them.

有人知道我如何解决此问题吗? (例如，通过回收设备)

Does anybody has any idea how I can resolve this problem? (By reclaiming the device, for example)

推荐答案

如果您的内核版本> 3.5，由于pn533驱动程序的自动加载，nfs-list和pcscd将报告此错误.

If you have kernel version > 3.5, nfs-list and pcscd will report this error due to the automatic load of pn533 driver.

要读取pcscd dameon输出，可以使用以下命令运行它:pcscd -f -d

To read the pcscd dameon output you can run it using: pcscd -f -d

检查已安装的内核版本:uname -a
黑名单pn533和nfc驱动程序(参考: Arch Linux Wiki Touchatag RFID读者， nfc-tools论坛):

Check which kernel version is installed: uname -a
Blacklist pn533 and nfc drivers (references: Arch Linux wiki Touchatag RFID Reader, nfc-tools forum):

$ sudo nano /etc/modprobe.d/blacklist-libnfc.conf

添加以下几行:

blacklist pn533
blacklist nfc

禁用内核模块:

Disable kernel modules:

$ modprobe -r pn533 nfc

重新启动pcscd守护程序:sudo service pcscd restart

Restart the pcscd daemon: sudo service pcscd restart

在这里您可以完善一个小程序来测试您的ACR122U阅读器和更详细的指南.