eap_peer_config::pcsc field
pcsc - Parameters for PC/SC smartcard interface for USIM and GSM SIM This field is used to configure PC/SC smartcard interface. Currently, the only configuration is whether this field is %NULL (do not use PC/SC) or non-NULL (e.g., "") to enable PC/SC. This field is used for EAP-SIM and EAP-AKA.