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I am trying to use the ACR122U reader. I installed everything, however when I use nfc-list or any other command I get :

me@me:~$ nfc-list 
nfc-list uses libnfc 1.7.1
error   libnfc.driver.acr122_usb    Unable to claim USB interface (Device or resource busy)
nfc-list: ERROR: Unable to open NFC device: acr122_usb:003:004

I searched and find several posts about the same problem such as:

Unable to claim USB interface (Device or resource busy)

but their solution does not work for me. I have blacklisted pn533 and nfc in

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

however when I try to disable the kernel modules I get:

me@me:~$  modprobe -r pn533 nfc
modprobe: FATAL: Module pn533 is in use.
me@me:~$ modprobe -rf pn533 nfc
modprobe: FATAL: Module pn533 is in use.

Is there any way to solve this problem?

Matteo Guarnerio
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Abdullah Barnawi
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  • Possible duplicate of [Unable to claim USB interface (Device or resource busy)](https://stackoverflow.com/questions/31131569/unable-to-claim-usb-interface-device-or-resource-busy) – Matteo Guarnerio May 06 '19 at 12:52

1 Answers1

2

I have managed to solve this issue by adding blacklist pn533_usb to: 

/etc/modprobe.d/blacklist-libnfc.conf

so its content is:

blacklist nfc
blacklist pn533
blacklist pn533_usb

then run sudo modprobe -rf pn533_usb

Matteo Guarnerio
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Abdullah Barnawi
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