1 /* 2 * The NFC Controller Interface is the communication protocol between an 3 * NFC Controller (NFCC) and a Device Host (DH). 4 * 5 * Copyright (C) 2011 Texas Instruments, Inc. 6 * 7 * Written by Ilan Elias <ilane@ti.com> 8 * 9 * Acknowledgements: 10 * This file is based on hci_event.c, which was written 11 * by Maxim Krasnyansky. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 15 * as published by the Free Software Foundation 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 */ 27 28 #include <linux/types.h> 29 #include <linux/interrupt.h> 30 #include <linux/bitops.h> 31 #include <linux/skbuff.h> 32 33 #include "../nfc.h" 34 #include <net/nfc/nci.h> 35 #include <net/nfc/nci_core.h> 36 #include <linux/nfc.h> 37 38 /* Handle NCI Notification packets */ 39 40 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev, 41 struct sk_buff *skb) 42 { 43 struct nci_core_conn_credit_ntf *ntf = (void *) skb->data; 44 int i; 45 46 nfc_dbg("entry, num_entries %d", ntf->num_entries); 47 48 if (ntf->num_entries > NCI_MAX_NUM_CONN) 49 ntf->num_entries = NCI_MAX_NUM_CONN; 50 51 /* update the credits */ 52 for (i = 0; i < ntf->num_entries; i++) { 53 nfc_dbg("entry[%d]: conn_id %d, credits %d", i, 54 ntf->conn_entries[i].conn_id, 55 ntf->conn_entries[i].credits); 56 57 if (ntf->conn_entries[i].conn_id == ndev->conn_id) { 58 /* found static rf connection */ 59 atomic_add(ntf->conn_entries[i].credits, 60 &ndev->credits_cnt); 61 } 62 } 63 64 /* trigger the next tx */ 65 if (!skb_queue_empty(&ndev->tx_q)) 66 queue_work(ndev->tx_wq, &ndev->tx_work); 67 } 68 69 static void nci_rf_field_info_ntf_packet(struct nci_dev *ndev, 70 struct sk_buff *skb) 71 { 72 struct nci_rf_field_info_ntf *ntf = (void *) skb->data; 73 74 nfc_dbg("entry, rf_field_status %d", ntf->rf_field_status); 75 } 76 77 static int nci_rf_activate_nfca_passive_poll(struct nci_dev *ndev, 78 struct nci_rf_activate_ntf *ntf, __u8 *data) 79 { 80 struct rf_tech_specific_params_nfca_poll *nfca_poll; 81 struct activation_params_nfca_poll_iso_dep *nfca_poll_iso_dep; 82 83 nfca_poll = &ntf->rf_tech_specific_params.nfca_poll; 84 nfca_poll_iso_dep = &ntf->activation_params.nfca_poll_iso_dep; 85 86 nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data)); 87 data += 2; 88 89 nfca_poll->nfcid1_len = *data++; 90 91 nfc_dbg("sens_res 0x%x, nfcid1_len %d", 92 nfca_poll->sens_res, 93 nfca_poll->nfcid1_len); 94 95 memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len); 96 data += nfca_poll->nfcid1_len; 97 98 nfca_poll->sel_res_len = *data++; 99 100 if (nfca_poll->sel_res_len != 0) 101 nfca_poll->sel_res = *data++; 102 103 ntf->rf_interface_type = *data++; 104 ntf->activation_params_len = *data++; 105 106 nfc_dbg("sel_res_len %d, sel_res 0x%x, rf_interface_type %d, activation_params_len %d", 107 nfca_poll->sel_res_len, 108 nfca_poll->sel_res, 109 ntf->rf_interface_type, 110 ntf->activation_params_len); 111 112 switch (ntf->rf_interface_type) { 113 case NCI_RF_INTERFACE_ISO_DEP: 114 nfca_poll_iso_dep->rats_res_len = *data++; 115 if (nfca_poll_iso_dep->rats_res_len > 0) { 116 memcpy(nfca_poll_iso_dep->rats_res, 117 data, 118 nfca_poll_iso_dep->rats_res_len); 119 } 120 break; 121 122 case NCI_RF_INTERFACE_FRAME: 123 /* no activation params */ 124 break; 125 126 default: 127 nfc_err("unsupported rf_interface_type 0x%x", 128 ntf->rf_interface_type); 129 return -EPROTO; 130 } 131 132 return 0; 133 } 134 135 static void nci_target_found(struct nci_dev *ndev, 136 struct nci_rf_activate_ntf *ntf) 137 { 138 struct nfc_target nfc_tgt; 139 140 if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T) /* T2T MifareUL */ 141 nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK; 142 else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP) /* 4A */ 143 nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK; 144 145 nfc_tgt.sens_res = ntf->rf_tech_specific_params.nfca_poll.sens_res; 146 nfc_tgt.sel_res = ntf->rf_tech_specific_params.nfca_poll.sel_res; 147 148 if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) { 149 nfc_dbg("the target found does not have the desired protocol"); 150 return; 151 } 152 153 nfc_dbg("new target found, supported_protocols 0x%x", 154 nfc_tgt.supported_protocols); 155 156 ndev->target_available_prots = nfc_tgt.supported_protocols; 157 158 nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1); 159 } 160 161 static void nci_rf_activate_ntf_packet(struct nci_dev *ndev, 162 struct sk_buff *skb) 163 { 164 struct nci_rf_activate_ntf ntf; 165 __u8 *data = skb->data; 166 int rc = -1; 167 168 clear_bit(NCI_DISCOVERY, &ndev->flags); 169 set_bit(NCI_POLL_ACTIVE, &ndev->flags); 170 171 ntf.target_handle = *data++; 172 ntf.rf_protocol = *data++; 173 ntf.rf_tech_and_mode = *data++; 174 ntf.rf_tech_specific_params_len = *data++; 175 176 nfc_dbg("target_handle %d, rf_protocol 0x%x, rf_tech_and_mode 0x%x, rf_tech_specific_params_len %d", 177 ntf.target_handle, 178 ntf.rf_protocol, 179 ntf.rf_tech_and_mode, 180 ntf.rf_tech_specific_params_len); 181 182 switch (ntf.rf_tech_and_mode) { 183 case NCI_NFC_A_PASSIVE_POLL_MODE: 184 rc = nci_rf_activate_nfca_passive_poll(ndev, &ntf, 185 data); 186 break; 187 188 default: 189 nfc_err("unsupported rf_tech_and_mode 0x%x", 190 ntf.rf_tech_and_mode); 191 return; 192 } 193 194 if (!rc) 195 nci_target_found(ndev, &ntf); 196 } 197 198 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev, 199 struct sk_buff *skb) 200 { 201 __u8 type = skb->data[0]; 202 203 nfc_dbg("entry, type 0x%x", type); 204 205 clear_bit(NCI_POLL_ACTIVE, &ndev->flags); 206 ndev->target_active_prot = 0; 207 208 /* drop tx data queue */ 209 skb_queue_purge(&ndev->tx_q); 210 211 /* drop partial rx data packet */ 212 if (ndev->rx_data_reassembly) { 213 kfree_skb(ndev->rx_data_reassembly); 214 ndev->rx_data_reassembly = 0; 215 } 216 217 /* complete the data exchange transaction, if exists */ 218 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 219 nci_data_exchange_complete(ndev, NULL, -EIO); 220 } 221 222 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) 223 { 224 __u16 ntf_opcode = nci_opcode(skb->data); 225 226 nfc_dbg("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d", 227 nci_pbf(skb->data), 228 nci_opcode_gid(ntf_opcode), 229 nci_opcode_oid(ntf_opcode), 230 nci_plen(skb->data)); 231 232 /* strip the nci control header */ 233 skb_pull(skb, NCI_CTRL_HDR_SIZE); 234 235 switch (ntf_opcode) { 236 case NCI_OP_CORE_CONN_CREDITS_NTF: 237 nci_core_conn_credits_ntf_packet(ndev, skb); 238 break; 239 240 case NCI_OP_RF_FIELD_INFO_NTF: 241 nci_rf_field_info_ntf_packet(ndev, skb); 242 break; 243 244 case NCI_OP_RF_ACTIVATE_NTF: 245 nci_rf_activate_ntf_packet(ndev, skb); 246 break; 247 248 case NCI_OP_RF_DEACTIVATE_NTF: 249 nci_rf_deactivate_ntf_packet(ndev, skb); 250 break; 251 252 default: 253 nfc_err("unknown ntf opcode 0x%x", ntf_opcode); 254 break; 255 } 256 257 kfree_skb(skb); 258 } 259