nfc-binding

Binding to handle NFC devices and tags. It currently use the libnfc, but we would like to support neard. Unfortunatly, neard seem not mature enough right now.

Devices and Tags compatibilities

Those tags were tested with both SCL3711 (pn533) and ACS122U (pn532). ACS122U is currently not working using neard and have also some issues with libnfc. Expect random error, but seem to stay stable and working.

Tag type	Protocol	libnfc	neard
Alien H3 + FM1108	ISO/IEC 14443A	yes	no²
FM1108	ISO/IEC 14443A	yes	no²
Hitag2	ISO/IEC 14443A	yes	no
Mifaire Ultralight	ISO/IEC 14443A	yes	yes
Mifare 1K S50	ISO/IEC 14443A	yes	no²
Mifare Plus S2K	ISO/IEC 14443A	yes	no²
Mifare Desfire D41	ISO/IEC 14443A	yes	yes
NTag 213	ISO/IEC 14443A	yes	yes
Hellfest Cashless	ISO/IEC 14443A	yes	no²
French biometric passeport¹	ISO/IEC 14443A	yes	no²
French Credit Card	ISO/IEC 14443-4B	yes	no²
Alien H3	N/A	no	no
Alien H3 9654	N/A	no	no
Alien H3 9662	N/A	no	no
Alien H3 + TK4100	N/A	no	no
EM4450	N/A	no	no
ICODE SLI	N/A	no	no
Picopass 2KS	N/A	no	no
SRI512	N/A	no	no
Tag-it HF-I (TI2048)	N/A	no	no
TK4100	N/A	no	no

¹ UID is randomly generated so the tag is detected as a new one on each poll.

² Polling is stopped at detection but no tag is exposed.

UDev rules

You may want to add some UDev's rule for nfc device to make things easier. You can put those lines into /etc/udev/rules.d/99-nfc.rules

ACTION!="add", GOTO="nfc_pn53x_end"

# Advanced Card Systems, Ltd ACR122U
ATTRS{idVendor}=="072f", ATTRS{idProduct}=="2200", MODE="0666", SYMLINK+="nfc%n"

# SCM Microsystems, Inc. SCL3711-NFC&RW
ATTRS{idVendor}=="04e6", ATTRS{idProduct}=="5591", MODE="0666", SYMLINK+="nfc%n"

LABEL="nfc_pn53x_end"

Kernel module

The SCL3711 is supported by the kernel and neard, so it takes the device and prevent the libnfc to use it. If you have an error saying that the device is busy, it's probably the reason why.

You have to unload nfc kernel modules to get it work using libnfc.

root@localhost# rmmod pn533_usb
root@localhost# rmmod pn533
root@localhost# rmmod nfc

To make it permanent you can add this file: /etc/modprobe.d/blacklist-nfc.conf

blacklist nfc
blacklist pn533
blacklist pn533_usb

Compilation option

• USE_LIBNFC - Enable or disable the 'libnfc' usage. Default is ON.
  • LIBNFC_POLL_ALL Enable all modulation when polling. Default is OFF.
  • LIBNFC_POLL_NMT_ISO14443A - Enable ISO-14443A modulation when polling. Default is ON.
  • LIBNFC_POLL_NMT_ISOJEWEL - Enable ISO-JEWEL modulation when polling. Default is OFF.
  • LIBNFC_POLL_NMT_ISO14443B - Enable ISO-14443B modulation when polling. Default is OFF.
  • LIBNFC_POLL_NMT_ISO14443BI - Enable ISO-14443BI modulation when polling. Default is OFF.
  • LIBNFC_POLL_NMT_ISO14443B2SR - Enable ISO-14443B2SR modulation when polling. Default is OFF.
  • LIBNFC_POLL_NMT_ISO14443B2CT - Enable ISO-14443B2CT modulation when polling. Default is OFF.
  • LIBNFC_POLL_NMT_FELICA - Enable Felica modulation when polling. Default is OFF.