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