556 строки
15 KiB
C
556 строки
15 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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#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
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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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pr_debug("num_entries %d\n", 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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ntf->conn_entries[i].conn_id =
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nci_conn_id(&ntf->conn_entries[i].conn_id);
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pr_debug("entry[%d]: conn_id %d, credits %d\n",
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i, 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 == NCI_STATIC_RF_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_core_generic_error_ntf_packet(struct nci_dev *ndev,
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struct sk_buff *skb)
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{
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__u8 status = skb->data[0];
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pr_debug("status 0x%x\n", status);
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if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
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/* Activation failed, so complete the request
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(the state remains the same) */
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nci_req_complete(ndev, status);
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}
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}
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static void nci_core_conn_intf_error_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_intf_error_ntf *ntf = (void *) skb->data;
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ntf->conn_id = nci_conn_id(&ntf->conn_id);
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pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
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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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static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
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struct rf_tech_specific_params_nfca_poll *nfca_poll,
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__u8 *data)
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{
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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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pr_debug("sens_res 0x%x, nfcid1_len %d\n",
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nfca_poll->sens_res, 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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pr_debug("sel_res_len %d, sel_res 0x%x\n",
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nfca_poll->sel_res_len,
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nfca_poll->sel_res);
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return data;
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}
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static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
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struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
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__u8 *data)
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{
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nfcb_poll->sensb_res_len = *data++;
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pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
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memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
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data += nfcb_poll->sensb_res_len;
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return data;
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}
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static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
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struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
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__u8 *data)
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{
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nfcf_poll->bit_rate = *data++;
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nfcf_poll->sensf_res_len = *data++;
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pr_debug("bit_rate %d, sensf_res_len %d\n",
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nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
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memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
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data += nfcf_poll->sensf_res_len;
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return data;
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}
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static int nci_add_new_protocol(struct nci_dev *ndev,
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struct nfc_target *target,
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__u8 rf_protocol,
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__u8 rf_tech_and_mode,
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void *params)
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{
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struct rf_tech_specific_params_nfca_poll *nfca_poll;
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struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
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struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
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__u32 protocol;
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if (rf_protocol == NCI_RF_PROTOCOL_T2T)
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protocol = NFC_PROTO_MIFARE_MASK;
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else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
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protocol = NFC_PROTO_ISO14443_MASK;
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else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
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protocol = NFC_PROTO_FELICA_MASK;
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else
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protocol = 0;
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if (!(protocol & ndev->poll_prots)) {
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pr_err("the target found does not have the desired protocol\n");
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return -EPROTO;
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}
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if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
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nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
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target->sens_res = nfca_poll->sens_res;
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target->sel_res = nfca_poll->sel_res;
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target->nfcid1_len = nfca_poll->nfcid1_len;
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if (target->nfcid1_len > 0) {
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memcpy(target->nfcid1, nfca_poll->nfcid1,
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target->nfcid1_len);
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}
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} else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
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nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
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target->sensb_res_len = nfcb_poll->sensb_res_len;
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if (target->sensb_res_len > 0) {
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memcpy(target->sensb_res, nfcb_poll->sensb_res,
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target->sensb_res_len);
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}
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} else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
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nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
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target->sensf_res_len = nfcf_poll->sensf_res_len;
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if (target->sensf_res_len > 0) {
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memcpy(target->sensf_res, nfcf_poll->sensf_res,
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target->sensf_res_len);
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}
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} else {
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pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
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return -EPROTO;
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}
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target->supported_protocols |= protocol;
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pr_debug("protocol 0x%x\n", protocol);
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return 0;
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}
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static void nci_add_new_target(struct nci_dev *ndev,
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struct nci_rf_discover_ntf *ntf)
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{
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struct nfc_target *target;
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int i, rc;
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for (i = 0; i < ndev->n_targets; i++) {
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target = &ndev->targets[i];
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if (target->idx == ntf->rf_discovery_id) {
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/* This target already exists, add the new protocol */
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nci_add_new_protocol(ndev, target, ntf->rf_protocol,
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ntf->rf_tech_and_mode,
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&ntf->rf_tech_specific_params);
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return;
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}
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}
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/* This is a new target, check if we've enough room */
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if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
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pr_debug("not enough room, ignoring new target...\n");
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return;
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}
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target = &ndev->targets[ndev->n_targets];
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rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
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ntf->rf_tech_and_mode,
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&ntf->rf_tech_specific_params);
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if (!rc) {
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target->idx = ntf->rf_discovery_id;
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ndev->n_targets++;
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pr_debug("target_idx %d, n_targets %d\n", target->idx,
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ndev->n_targets);
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}
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}
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void nci_clear_target_list(struct nci_dev *ndev)
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{
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memset(ndev->targets, 0,
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(sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
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ndev->n_targets = 0;
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}
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static void nci_rf_discover_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_discover_ntf ntf;
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__u8 *data = skb->data;
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bool add_target = true;
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ntf.rf_discovery_id = *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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pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
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pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
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pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
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pr_debug("rf_tech_specific_params_len %d\n",
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ntf.rf_tech_specific_params_len);
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if (ntf.rf_tech_specific_params_len > 0) {
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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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data = nci_extract_rf_params_nfca_passive_poll(ndev,
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&(ntf.rf_tech_specific_params.nfca_poll), data);
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break;
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case NCI_NFC_B_PASSIVE_POLL_MODE:
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data = nci_extract_rf_params_nfcb_passive_poll(ndev,
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&(ntf.rf_tech_specific_params.nfcb_poll), data);
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break;
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case NCI_NFC_F_PASSIVE_POLL_MODE:
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data = nci_extract_rf_params_nfcf_passive_poll(ndev,
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&(ntf.rf_tech_specific_params.nfcf_poll), data);
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break;
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default:
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pr_err("unsupported rf_tech_and_mode 0x%x\n",
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ntf.rf_tech_and_mode);
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data += ntf.rf_tech_specific_params_len;
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add_target = false;
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}
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}
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ntf.ntf_type = *data++;
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pr_debug("ntf_type %d\n", ntf.ntf_type);
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if (add_target == true)
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nci_add_new_target(ndev, &ntf);
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if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
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atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
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} else {
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atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
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nfc_targets_found(ndev->nfc_dev, ndev->targets,
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ndev->n_targets);
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}
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}
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static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
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struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
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{
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struct activation_params_nfca_poll_iso_dep *nfca_poll;
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struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
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switch (ntf->activation_rf_tech_and_mode) {
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case NCI_NFC_A_PASSIVE_POLL_MODE:
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nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
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nfca_poll->rats_res_len = *data++;
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pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
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if (nfca_poll->rats_res_len > 0) {
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memcpy(nfca_poll->rats_res,
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data, nfca_poll->rats_res_len);
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}
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break;
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case NCI_NFC_B_PASSIVE_POLL_MODE:
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nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
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nfcb_poll->attrib_res_len = *data++;
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pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
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if (nfcb_poll->attrib_res_len > 0) {
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memcpy(nfcb_poll->attrib_res,
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data, nfcb_poll->attrib_res_len);
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}
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break;
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default:
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pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
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ntf->activation_rf_tech_and_mode);
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return NCI_STATUS_RF_PROTOCOL_ERROR;
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}
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return NCI_STATUS_OK;
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}
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static void nci_target_auto_activated(struct nci_dev *ndev,
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struct nci_rf_intf_activated_ntf *ntf)
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{
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struct nfc_target *target;
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int rc;
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target = &ndev->targets[ndev->n_targets];
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rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
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ntf->activation_rf_tech_and_mode,
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&ntf->rf_tech_specific_params);
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if (rc)
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return;
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target->idx = ntf->rf_discovery_id;
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ndev->n_targets++;
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pr_debug("target_idx %d, n_targets %d\n", target->idx, ndev->n_targets);
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nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
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}
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static void nci_rf_intf_activated_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_intf_activated_ntf ntf;
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__u8 *data = skb->data;
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int err = NCI_STATUS_OK;
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ntf.rf_discovery_id = *data++;
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ntf.rf_interface = *data++;
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ntf.rf_protocol = *data++;
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ntf.activation_rf_tech_and_mode = *data++;
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ntf.max_data_pkt_payload_size = *data++;
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ntf.initial_num_credits = *data++;
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ntf.rf_tech_specific_params_len = *data++;
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pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
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pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
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pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
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pr_debug("activation_rf_tech_and_mode 0x%x\n",
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ntf.activation_rf_tech_and_mode);
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pr_debug("max_data_pkt_payload_size 0x%x\n",
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ntf.max_data_pkt_payload_size);
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pr_debug("initial_num_credits 0x%x\n",
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ntf.initial_num_credits);
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pr_debug("rf_tech_specific_params_len %d\n",
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ntf.rf_tech_specific_params_len);
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if (ntf.rf_tech_specific_params_len > 0) {
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switch (ntf.activation_rf_tech_and_mode) {
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case NCI_NFC_A_PASSIVE_POLL_MODE:
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data = nci_extract_rf_params_nfca_passive_poll(ndev,
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&(ntf.rf_tech_specific_params.nfca_poll), data);
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break;
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case NCI_NFC_B_PASSIVE_POLL_MODE:
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data = nci_extract_rf_params_nfcb_passive_poll(ndev,
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&(ntf.rf_tech_specific_params.nfcb_poll), data);
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break;
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case NCI_NFC_F_PASSIVE_POLL_MODE:
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data = nci_extract_rf_params_nfcf_passive_poll(ndev,
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&(ntf.rf_tech_specific_params.nfcf_poll), data);
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break;
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default:
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pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
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ntf.activation_rf_tech_and_mode);
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err = NCI_STATUS_RF_PROTOCOL_ERROR;
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goto exit;
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}
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}
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ntf.data_exch_rf_tech_and_mode = *data++;
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ntf.data_exch_tx_bit_rate = *data++;
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ntf.data_exch_rx_bit_rate = *data++;
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ntf.activation_params_len = *data++;
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pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
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ntf.data_exch_rf_tech_and_mode);
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pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
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pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
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pr_debug("activation_params_len %d\n", ntf.activation_params_len);
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if (ntf.activation_params_len > 0) {
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switch (ntf.rf_interface) {
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case NCI_RF_INTERFACE_ISO_DEP:
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|
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);
|
|
err = NCI_STATUS_RF_PROTOCOL_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
exit:
|
|
if (err == NCI_STATUS_OK) {
|
|
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);
|
|
}
|
|
|
|
if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
|
|
/* A single target was found and activated automatically */
|
|
atomic_set(&ndev->state, NCI_POLL_ACTIVE);
|
|
if (err == NCI_STATUS_OK)
|
|
nci_target_auto_activated(ndev, &ntf);
|
|
} else { /* ndev->state == NCI_W4_HOST_SELECT */
|
|
/* A selected target was activated, so complete the request */
|
|
atomic_set(&ndev->state, NCI_POLL_ACTIVE);
|
|
nci_req_complete(ndev, err);
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
/* 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);
|
|
|
|
nci_clear_target_list(ndev);
|
|
atomic_set(&ndev->state, NCI_IDLE);
|
|
nci_req_complete(ndev, NCI_STATUS_OK);
|
|
}
|
|
|
|
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_GENERIC_ERROR_NTF:
|
|
nci_core_generic_error_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_DISCOVER_NTF:
|
|
nci_rf_discover_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);
|
|
}
|