/* * The NFC Controller Interface is the communication protocol between an * NFC Controller (NFCC) and a Device Host (DH). * * Copyright (C) 2011 Texas Instruments, Inc. * * Written by Ilan Elias <ilane@ti.com> * * Acknowledgements: * This file is based on hci_event.c, which was written * by Maxim Krasnyansky. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ #include <linux/types.h> #include <linux/interrupt.h> #include <linux/bitops.h> #include <linux/skbuff.h> #include "../nfc.h" #include <net/nfc/nci.h> #include <net/nfc/nci_core.h> #include <linux/nfc.h> /* Handle NCI Notification packets */ static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) { struct nci_core_conn_credit_ntf *ntf = (void *) skb->data; int i; pr_debug("num_entries %d\n", ntf->num_entries); if (ntf->num_entries > NCI_MAX_NUM_CONN) ntf->num_entries = NCI_MAX_NUM_CONN; /* update the credits */ for (i = 0; i < ntf->num_entries; i++) { ntf->conn_entries[i].conn_id = nci_conn_id(&ntf->conn_entries[i].conn_id); pr_debug("entry[%d]: conn_id %d, credits %d\n", i, ntf->conn_entries[i].conn_id, ntf->conn_entries[i].credits); if (ntf->conn_entries[i].conn_id == NCI_STATIC_RF_CONN_ID) { /* found static rf connection */ atomic_add(ntf->conn_entries[i].credits, &ndev->credits_cnt); } } /* trigger the next tx */ if (!skb_queue_empty(&ndev->tx_q)) queue_work(ndev->tx_wq, &ndev->tx_work); } static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) { struct nci_core_intf_error_ntf *ntf = (void *) skb->data; ntf->conn_id = nci_conn_id(&ntf->conn_id); pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id); /* complete the data exchange transaction, if exists */ if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) nci_data_exchange_complete(ndev, NULL, -EIO); } static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev, struct nci_rf_intf_activated_ntf *ntf, __u8 *data) { struct rf_tech_specific_params_nfca_poll *nfca_poll; nfca_poll = &ntf->rf_tech_specific_params.nfca_poll; nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data)); data += 2; nfca_poll->nfcid1_len = *data++; pr_debug("sens_res 0x%x, nfcid1_len %d\n", nfca_poll->sens_res, nfca_poll->nfcid1_len); memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len); data += nfca_poll->nfcid1_len; nfca_poll->sel_res_len = *data++; if (nfca_poll->sel_res_len != 0) nfca_poll->sel_res = *data++; pr_debug("sel_res_len %d, sel_res 0x%x\n", nfca_poll->sel_res_len, nfca_poll->sel_res); return data; } static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev, struct nci_rf_intf_activated_ntf *ntf, __u8 *data) { struct activation_params_nfca_poll_iso_dep *nfca_poll; switch (ntf->activation_rf_tech_and_mode) { case NCI_NFC_A_PASSIVE_POLL_MODE: nfca_poll = &ntf->activation_params.nfca_poll_iso_dep; nfca_poll->rats_res_len = *data++; if (nfca_poll->rats_res_len > 0) { memcpy(nfca_poll->rats_res, data, nfca_poll->rats_res_len); } break; default: pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", ntf->activation_rf_tech_and_mode); return -EPROTO; } return 0; } static void nci_target_found(struct nci_dev *ndev, struct nci_rf_intf_activated_ntf *ntf) { struct nfc_target nfc_tgt; if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T) /* T2T MifareUL */ nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK; else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP) /* 4A */ nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK; else nfc_tgt.supported_protocols = 0; nfc_tgt.sens_res = ntf->rf_tech_specific_params.nfca_poll.sens_res; nfc_tgt.sel_res = ntf->rf_tech_specific_params.nfca_poll.sel_res; nfc_tgt.nfcid1_len = ntf->rf_tech_specific_params.nfca_poll.nfcid1_len; if (nfc_tgt.nfcid1_len > 0) { memcpy(nfc_tgt.nfcid1, ntf->rf_tech_specific_params.nfca_poll.nfcid1, nfc_tgt.nfcid1_len); } if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) { pr_debug("the target found does not have the desired protocol\n"); return; } pr_debug("new target found, supported_protocols 0x%x\n", nfc_tgt.supported_protocols); ndev->target_available_prots = nfc_tgt.supported_protocols; ndev->max_data_pkt_payload_size = ntf->max_data_pkt_payload_size; ndev->initial_num_credits = ntf->initial_num_credits; /* set the available credits to initial value */ atomic_set(&ndev->credits_cnt, ndev->initial_num_credits); nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1); } static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) { struct nci_rf_intf_activated_ntf ntf; __u8 *data = skb->data; int err = 0; clear_bit(NCI_DISCOVERY, &ndev->flags); set_bit(NCI_POLL_ACTIVE, &ndev->flags); ntf.rf_discovery_id = *data++; ntf.rf_interface = *data++; ntf.rf_protocol = *data++; ntf.activation_rf_tech_and_mode = *data++; ntf.max_data_pkt_payload_size = *data++; ntf.initial_num_credits = *data++; ntf.rf_tech_specific_params_len = *data++; pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id); pr_debug("rf_interface 0x%x\n", ntf.rf_interface); pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol); pr_debug("activation_rf_tech_and_mode 0x%x\n", ntf.activation_rf_tech_and_mode); pr_debug("max_data_pkt_payload_size 0x%x\n", ntf.max_data_pkt_payload_size); pr_debug("initial_num_credits 0x%x\n", ntf.initial_num_credits); pr_debug("rf_tech_specific_params_len %d\n", ntf.rf_tech_specific_params_len); if (ntf.rf_tech_specific_params_len > 0) { switch (ntf.activation_rf_tech_and_mode) { case NCI_NFC_A_PASSIVE_POLL_MODE: data = nci_extract_rf_params_nfca_passive_poll(ndev, &ntf, data); break; default: pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", ntf.activation_rf_tech_and_mode); return; } } ntf.data_exch_rf_tech_and_mode = *data++; ntf.data_exch_tx_bit_rate = *data++; ntf.data_exch_rx_bit_rate = *data++; ntf.activation_params_len = *data++; pr_debug("data_exch_rf_tech_and_mode 0x%x\n", ntf.data_exch_rf_tech_and_mode); pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate); pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate); pr_debug("activation_params_len %d\n", ntf.activation_params_len); if (ntf.activation_params_len > 0) { switch (ntf.rf_interface) { case NCI_RF_INTERFACE_ISO_DEP: err = nci_extract_activation_params_iso_dep(ndev, &ntf, data); break; case NCI_RF_INTERFACE_FRAME: /* no activation params */ break; default: pr_err("unsupported rf_interface 0x%x\n", ntf.rf_interface); return; } } if (!err) nci_target_found(ndev, &ntf); } static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) { struct nci_rf_deactivate_ntf *ntf = (void *) skb->data; pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason); clear_bit(NCI_POLL_ACTIVE, &ndev->flags); ndev->target_active_prot = 0; /* drop tx data queue */ skb_queue_purge(&ndev->tx_q); /* drop partial rx data packet */ if (ndev->rx_data_reassembly) { kfree_skb(ndev->rx_data_reassembly); ndev->rx_data_reassembly = 0; } /* complete the data exchange transaction, if exists */ if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) nci_data_exchange_complete(ndev, NULL, -EIO); } void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) { __u16 ntf_opcode = nci_opcode(skb->data); pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", nci_pbf(skb->data), nci_opcode_gid(ntf_opcode), nci_opcode_oid(ntf_opcode), nci_plen(skb->data)); /* strip the nci control header */ skb_pull(skb, NCI_CTRL_HDR_SIZE); switch (ntf_opcode) { case NCI_OP_CORE_CONN_CREDITS_NTF: nci_core_conn_credits_ntf_packet(ndev, skb); break; case NCI_OP_CORE_INTF_ERROR_NTF: nci_core_conn_intf_error_ntf_packet(ndev, skb); break; case NCI_OP_RF_INTF_ACTIVATED_NTF: nci_rf_intf_activated_ntf_packet(ndev, skb); break; case NCI_OP_RF_DEACTIVATE_NTF: nci_rf_deactivate_ntf_packet(ndev, skb); break; default: pr_err("unknown ntf opcode 0x%x\n", ntf_opcode); break; } kfree_skb(skb); }