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 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 29 30 #include <linux/types.h> 31 #include <linux/interrupt.h> 32 #include <linux/bitops.h> 33 #include <linux/skbuff.h> 34 35 #include "../nfc.h" 36 #include <net/nfc/nci.h> 37 #include <net/nfc/nci_core.h> 38 #include <linux/nfc.h> 39 40 /* Handle NCI Notification packets */ 41 42 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev, 43 struct sk_buff *skb) 44 { 45 struct nci_core_conn_credit_ntf *ntf = (void *) skb->data; 46 int i; 47 48 pr_debug("num_entries %d\n", ntf->num_entries); 49 50 if (ntf->num_entries > NCI_MAX_NUM_CONN) 51 ntf->num_entries = NCI_MAX_NUM_CONN; 52 53 /* update the credits */ 54 for (i = 0; i < ntf->num_entries; i++) { 55 ntf->conn_entries[i].conn_id = 56 nci_conn_id(&ntf->conn_entries[i].conn_id); 57 58 pr_debug("entry[%d]: conn_id %d, credits %d\n", 59 i, ntf->conn_entries[i].conn_id, 60 ntf->conn_entries[i].credits); 61 62 if (ntf->conn_entries[i].conn_id == NCI_STATIC_RF_CONN_ID) { 63 /* found static rf connection */ 64 atomic_add(ntf->conn_entries[i].credits, 65 &ndev->credits_cnt); 66 } 67 } 68 69 /* trigger the next tx */ 70 if (!skb_queue_empty(&ndev->tx_q)) 71 queue_work(ndev->tx_wq, &ndev->tx_work); 72 } 73 74 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev, 75 struct sk_buff *skb) 76 { 77 struct nci_core_intf_error_ntf *ntf = (void *) skb->data; 78 79 ntf->conn_id = nci_conn_id(&ntf->conn_id); 80 81 pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id); 82 83 /* complete the data exchange transaction, if exists */ 84 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 85 nci_data_exchange_complete(ndev, NULL, -EIO); 86 } 87 88 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev, 89 struct nci_rf_intf_activated_ntf *ntf, __u8 *data) 90 { 91 struct rf_tech_specific_params_nfca_poll *nfca_poll; 92 93 nfca_poll = &ntf->rf_tech_specific_params.nfca_poll; 94 95 nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data)); 96 data += 2; 97 98 nfca_poll->nfcid1_len = *data++; 99 100 pr_debug("sens_res 0x%x, nfcid1_len %d\n", 101 nfca_poll->sens_res, nfca_poll->nfcid1_len); 102 103 memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len); 104 data += nfca_poll->nfcid1_len; 105 106 nfca_poll->sel_res_len = *data++; 107 108 if (nfca_poll->sel_res_len != 0) 109 nfca_poll->sel_res = *data++; 110 111 pr_debug("sel_res_len %d, sel_res 0x%x\n", 112 nfca_poll->sel_res_len, 113 nfca_poll->sel_res); 114 115 return data; 116 } 117 118 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev, 119 struct nci_rf_intf_activated_ntf *ntf, __u8 *data) 120 { 121 struct rf_tech_specific_params_nfcb_poll *nfcb_poll; 122 123 nfcb_poll = &ntf->rf_tech_specific_params.nfcb_poll; 124 125 nfcb_poll->sensb_res_len = *data++; 126 127 pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len); 128 129 memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len); 130 data += nfcb_poll->sensb_res_len; 131 132 return data; 133 } 134 135 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev, 136 struct nci_rf_intf_activated_ntf *ntf, __u8 *data) 137 { 138 struct rf_tech_specific_params_nfcf_poll *nfcf_poll; 139 140 nfcf_poll = &ntf->rf_tech_specific_params.nfcf_poll; 141 142 nfcf_poll->bit_rate = *data++; 143 nfcf_poll->sensf_res_len = *data++; 144 145 pr_debug("bit_rate %d, sensf_res_len %d\n", 146 nfcf_poll->bit_rate, nfcf_poll->sensf_res_len); 147 148 memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len); 149 data += nfcf_poll->sensf_res_len; 150 151 return data; 152 } 153 154 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev, 155 struct nci_rf_intf_activated_ntf *ntf, __u8 *data) 156 { 157 struct activation_params_nfca_poll_iso_dep *nfca_poll; 158 struct activation_params_nfcb_poll_iso_dep *nfcb_poll; 159 160 switch (ntf->activation_rf_tech_and_mode) { 161 case NCI_NFC_A_PASSIVE_POLL_MODE: 162 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep; 163 nfca_poll->rats_res_len = *data++; 164 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len); 165 if (nfca_poll->rats_res_len > 0) { 166 memcpy(nfca_poll->rats_res, 167 data, 168 nfca_poll->rats_res_len); 169 } 170 break; 171 172 case NCI_NFC_B_PASSIVE_POLL_MODE: 173 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep; 174 nfcb_poll->attrib_res_len = *data++; 175 pr_debug("attrib_res_len %d\n", 176 nfcb_poll->attrib_res_len); 177 if (nfcb_poll->attrib_res_len > 0) { 178 memcpy(nfcb_poll->attrib_res, 179 data, 180 nfcb_poll->attrib_res_len); 181 } 182 break; 183 184 default: 185 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", 186 ntf->activation_rf_tech_and_mode); 187 return -EPROTO; 188 } 189 190 return 0; 191 } 192 193 static void nci_target_found(struct nci_dev *ndev, 194 struct nci_rf_intf_activated_ntf *ntf) 195 { 196 struct nfc_target nfc_tgt; 197 198 memset(&nfc_tgt, 0, sizeof(nfc_tgt)); 199 200 if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T) 201 nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK; 202 else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP) 203 nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK; 204 else if (ntf->rf_protocol == NCI_RF_PROTOCOL_T3T) 205 nfc_tgt.supported_protocols = NFC_PROTO_FELICA_MASK; 206 207 if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) { 208 pr_debug("the target found does not have the desired protocol\n"); 209 return; 210 } 211 212 pr_debug("new target found, supported_protocols 0x%x\n", 213 nfc_tgt.supported_protocols); 214 215 if (ntf->activation_rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) { 216 nfc_tgt.sens_res = 217 ntf->rf_tech_specific_params.nfca_poll.sens_res; 218 nfc_tgt.sel_res = 219 ntf->rf_tech_specific_params.nfca_poll.sel_res; 220 nfc_tgt.nfcid1_len = 221 ntf->rf_tech_specific_params.nfca_poll.nfcid1_len; 222 if (nfc_tgt.nfcid1_len > 0) { 223 memcpy(nfc_tgt.nfcid1, 224 ntf->rf_tech_specific_params.nfca_poll.nfcid1, 225 nfc_tgt.nfcid1_len); 226 } 227 } else if (ntf->activation_rf_tech_and_mode == 228 NCI_NFC_B_PASSIVE_POLL_MODE) { 229 nfc_tgt.sensb_res_len = 230 ntf->rf_tech_specific_params.nfcb_poll.sensb_res_len; 231 if (nfc_tgt.sensb_res_len > 0) { 232 memcpy(nfc_tgt.sensb_res, 233 ntf->rf_tech_specific_params.nfcb_poll.sensb_res, 234 nfc_tgt.sensb_res_len); 235 } 236 } else if (ntf->activation_rf_tech_and_mode == 237 NCI_NFC_F_PASSIVE_POLL_MODE) { 238 nfc_tgt.sensf_res_len = 239 ntf->rf_tech_specific_params.nfcf_poll.sensf_res_len; 240 if (nfc_tgt.sensf_res_len > 0) { 241 memcpy(nfc_tgt.sensf_res, 242 ntf->rf_tech_specific_params.nfcf_poll.sensf_res, 243 nfc_tgt.sensf_res_len); 244 } 245 } 246 247 ndev->target_available_prots = nfc_tgt.supported_protocols; 248 ndev->max_data_pkt_payload_size = ntf->max_data_pkt_payload_size; 249 ndev->initial_num_credits = ntf->initial_num_credits; 250 251 /* set the available credits to initial value */ 252 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits); 253 254 nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1); 255 } 256 257 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev, 258 struct sk_buff *skb) 259 { 260 struct nci_rf_intf_activated_ntf ntf; 261 __u8 *data = skb->data; 262 int err = 0; 263 264 clear_bit(NCI_DISCOVERY, &ndev->flags); 265 set_bit(NCI_POLL_ACTIVE, &ndev->flags); 266 267 ntf.rf_discovery_id = *data++; 268 ntf.rf_interface = *data++; 269 ntf.rf_protocol = *data++; 270 ntf.activation_rf_tech_and_mode = *data++; 271 ntf.max_data_pkt_payload_size = *data++; 272 ntf.initial_num_credits = *data++; 273 ntf.rf_tech_specific_params_len = *data++; 274 275 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id); 276 pr_debug("rf_interface 0x%x\n", ntf.rf_interface); 277 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol); 278 pr_debug("activation_rf_tech_and_mode 0x%x\n", 279 ntf.activation_rf_tech_and_mode); 280 pr_debug("max_data_pkt_payload_size 0x%x\n", 281 ntf.max_data_pkt_payload_size); 282 pr_debug("initial_num_credits 0x%x\n", ntf.initial_num_credits); 283 pr_debug("rf_tech_specific_params_len %d\n", 284 ntf.rf_tech_specific_params_len); 285 286 if (ntf.rf_tech_specific_params_len > 0) { 287 switch (ntf.activation_rf_tech_and_mode) { 288 case NCI_NFC_A_PASSIVE_POLL_MODE: 289 data = nci_extract_rf_params_nfca_passive_poll(ndev, 290 &ntf, data); 291 break; 292 293 case NCI_NFC_B_PASSIVE_POLL_MODE: 294 data = nci_extract_rf_params_nfcb_passive_poll(ndev, 295 &ntf, data); 296 break; 297 298 case NCI_NFC_F_PASSIVE_POLL_MODE: 299 data = nci_extract_rf_params_nfcf_passive_poll(ndev, 300 &ntf, data); 301 break; 302 303 default: 304 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", 305 ntf.activation_rf_tech_and_mode); 306 return; 307 } 308 } 309 310 ntf.data_exch_rf_tech_and_mode = *data++; 311 ntf.data_exch_tx_bit_rate = *data++; 312 ntf.data_exch_rx_bit_rate = *data++; 313 ntf.activation_params_len = *data++; 314 315 pr_debug("data_exch_rf_tech_and_mode 0x%x\n", 316 ntf.data_exch_rf_tech_and_mode); 317 pr_debug("data_exch_tx_bit_rate 0x%x\n", 318 ntf.data_exch_tx_bit_rate); 319 pr_debug("data_exch_rx_bit_rate 0x%x\n", 320 ntf.data_exch_rx_bit_rate); 321 pr_debug("activation_params_len %d\n", 322 ntf.activation_params_len); 323 324 if (ntf.activation_params_len > 0) { 325 switch (ntf.rf_interface) { 326 case NCI_RF_INTERFACE_ISO_DEP: 327 err = nci_extract_activation_params_iso_dep(ndev, 328 &ntf, data); 329 break; 330 331 case NCI_RF_INTERFACE_FRAME: 332 /* no activation params */ 333 break; 334 335 default: 336 pr_err("unsupported rf_interface 0x%x\n", 337 ntf.rf_interface); 338 return; 339 } 340 } 341 342 if (!err) 343 nci_target_found(ndev, &ntf); 344 } 345 346 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev, 347 struct sk_buff *skb) 348 { 349 struct nci_rf_deactivate_ntf *ntf = (void *) skb->data; 350 351 pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason); 352 353 clear_bit(NCI_POLL_ACTIVE, &ndev->flags); 354 ndev->target_active_prot = 0; 355 356 /* drop tx data queue */ 357 skb_queue_purge(&ndev->tx_q); 358 359 /* drop partial rx data packet */ 360 if (ndev->rx_data_reassembly) { 361 kfree_skb(ndev->rx_data_reassembly); 362 ndev->rx_data_reassembly = 0; 363 } 364 365 /* complete the data exchange transaction, if exists */ 366 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 367 nci_data_exchange_complete(ndev, NULL, -EIO); 368 369 nci_req_complete(ndev, NCI_STATUS_OK); 370 } 371 372 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) 373 { 374 __u16 ntf_opcode = nci_opcode(skb->data); 375 376 pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 377 nci_pbf(skb->data), 378 nci_opcode_gid(ntf_opcode), 379 nci_opcode_oid(ntf_opcode), 380 nci_plen(skb->data)); 381 382 /* strip the nci control header */ 383 skb_pull(skb, NCI_CTRL_HDR_SIZE); 384 385 switch (ntf_opcode) { 386 case NCI_OP_CORE_CONN_CREDITS_NTF: 387 nci_core_conn_credits_ntf_packet(ndev, skb); 388 break; 389 390 case NCI_OP_CORE_INTF_ERROR_NTF: 391 nci_core_conn_intf_error_ntf_packet(ndev, skb); 392 break; 393 394 case NCI_OP_RF_INTF_ACTIVATED_NTF: 395 nci_rf_intf_activated_ntf_packet(ndev, skb); 396 break; 397 398 case NCI_OP_RF_DEACTIVATE_NTF: 399 nci_rf_deactivate_ntf_packet(ndev, skb); 400 break; 401 402 default: 403 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode); 404 break; 405 } 406 407 kfree_skb(skb); 408 } 409