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_generic_error_ntf_packet(struct nci_dev *ndev, 75 struct sk_buff *skb) 76 { 77 __u8 status = skb->data[0]; 78 79 pr_debug("status 0x%x\n", status); 80 81 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 82 /* Activation failed, so complete the request 83 (the state remains the same) */ 84 nci_req_complete(ndev, status); 85 } 86 } 87 88 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev, 89 struct sk_buff *skb) 90 { 91 struct nci_core_intf_error_ntf *ntf = (void *) skb->data; 92 93 ntf->conn_id = nci_conn_id(&ntf->conn_id); 94 95 pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id); 96 97 /* complete the data exchange transaction, if exists */ 98 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 99 nci_data_exchange_complete(ndev, NULL, -EIO); 100 } 101 102 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev, 103 struct rf_tech_specific_params_nfca_poll *nfca_poll, 104 __u8 *data) 105 { 106 nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data)); 107 data += 2; 108 109 nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE); 110 111 pr_debug("sens_res 0x%x, nfcid1_len %d\n", 112 nfca_poll->sens_res, nfca_poll->nfcid1_len); 113 114 memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len); 115 data += nfca_poll->nfcid1_len; 116 117 nfca_poll->sel_res_len = *data++; 118 119 if (nfca_poll->sel_res_len != 0) 120 nfca_poll->sel_res = *data++; 121 122 pr_debug("sel_res_len %d, sel_res 0x%x\n", 123 nfca_poll->sel_res_len, 124 nfca_poll->sel_res); 125 126 return data; 127 } 128 129 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev, 130 struct rf_tech_specific_params_nfcb_poll *nfcb_poll, 131 __u8 *data) 132 { 133 nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE); 134 135 pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len); 136 137 memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len); 138 data += nfcb_poll->sensb_res_len; 139 140 return data; 141 } 142 143 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev, 144 struct rf_tech_specific_params_nfcf_poll *nfcf_poll, 145 __u8 *data) 146 { 147 nfcf_poll->bit_rate = *data++; 148 nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE); 149 150 pr_debug("bit_rate %d, sensf_res_len %d\n", 151 nfcf_poll->bit_rate, nfcf_poll->sensf_res_len); 152 153 memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len); 154 data += nfcf_poll->sensf_res_len; 155 156 return data; 157 } 158 159 static int nci_add_new_protocol(struct nci_dev *ndev, 160 struct nfc_target *target, 161 __u8 rf_protocol, 162 __u8 rf_tech_and_mode, 163 void *params) 164 { 165 struct rf_tech_specific_params_nfca_poll *nfca_poll; 166 struct rf_tech_specific_params_nfcb_poll *nfcb_poll; 167 struct rf_tech_specific_params_nfcf_poll *nfcf_poll; 168 __u32 protocol; 169 170 if (rf_protocol == NCI_RF_PROTOCOL_T2T) 171 protocol = NFC_PROTO_MIFARE_MASK; 172 else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP) 173 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) 174 protocol = NFC_PROTO_ISO14443_MASK; 175 else 176 protocol = NFC_PROTO_ISO14443_B_MASK; 177 else if (rf_protocol == NCI_RF_PROTOCOL_T3T) 178 protocol = NFC_PROTO_FELICA_MASK; 179 else 180 protocol = 0; 181 182 if (!(protocol & ndev->poll_prots)) { 183 pr_err("the target found does not have the desired protocol\n"); 184 return -EPROTO; 185 } 186 187 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) { 188 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params; 189 190 target->sens_res = nfca_poll->sens_res; 191 target->sel_res = nfca_poll->sel_res; 192 target->nfcid1_len = nfca_poll->nfcid1_len; 193 if (target->nfcid1_len > 0) { 194 memcpy(target->nfcid1, nfca_poll->nfcid1, 195 target->nfcid1_len); 196 } 197 } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) { 198 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params; 199 200 target->sensb_res_len = nfcb_poll->sensb_res_len; 201 if (target->sensb_res_len > 0) { 202 memcpy(target->sensb_res, nfcb_poll->sensb_res, 203 target->sensb_res_len); 204 } 205 } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) { 206 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params; 207 208 target->sensf_res_len = nfcf_poll->sensf_res_len; 209 if (target->sensf_res_len > 0) { 210 memcpy(target->sensf_res, nfcf_poll->sensf_res, 211 target->sensf_res_len); 212 } 213 } else { 214 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode); 215 return -EPROTO; 216 } 217 218 target->supported_protocols |= protocol; 219 220 pr_debug("protocol 0x%x\n", protocol); 221 222 return 0; 223 } 224 225 static void nci_add_new_target(struct nci_dev *ndev, 226 struct nci_rf_discover_ntf *ntf) 227 { 228 struct nfc_target *target; 229 int i, rc; 230 231 for (i = 0; i < ndev->n_targets; i++) { 232 target = &ndev->targets[i]; 233 if (target->logical_idx == ntf->rf_discovery_id) { 234 /* This target already exists, add the new protocol */ 235 nci_add_new_protocol(ndev, target, ntf->rf_protocol, 236 ntf->rf_tech_and_mode, 237 &ntf->rf_tech_specific_params); 238 return; 239 } 240 } 241 242 /* This is a new target, check if we've enough room */ 243 if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) { 244 pr_debug("not enough room, ignoring new target...\n"); 245 return; 246 } 247 248 target = &ndev->targets[ndev->n_targets]; 249 250 rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol, 251 ntf->rf_tech_and_mode, 252 &ntf->rf_tech_specific_params); 253 if (!rc) { 254 target->logical_idx = ntf->rf_discovery_id; 255 ndev->n_targets++; 256 257 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx, 258 ndev->n_targets); 259 } 260 } 261 262 void nci_clear_target_list(struct nci_dev *ndev) 263 { 264 memset(ndev->targets, 0, 265 (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS)); 266 267 ndev->n_targets = 0; 268 } 269 270 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev, 271 struct sk_buff *skb) 272 { 273 struct nci_rf_discover_ntf ntf; 274 __u8 *data = skb->data; 275 bool add_target = true; 276 277 ntf.rf_discovery_id = *data++; 278 ntf.rf_protocol = *data++; 279 ntf.rf_tech_and_mode = *data++; 280 ntf.rf_tech_specific_params_len = *data++; 281 282 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id); 283 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol); 284 pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode); 285 pr_debug("rf_tech_specific_params_len %d\n", 286 ntf.rf_tech_specific_params_len); 287 288 if (ntf.rf_tech_specific_params_len > 0) { 289 switch (ntf.rf_tech_and_mode) { 290 case NCI_NFC_A_PASSIVE_POLL_MODE: 291 data = nci_extract_rf_params_nfca_passive_poll(ndev, 292 &(ntf.rf_tech_specific_params.nfca_poll), data); 293 break; 294 295 case NCI_NFC_B_PASSIVE_POLL_MODE: 296 data = nci_extract_rf_params_nfcb_passive_poll(ndev, 297 &(ntf.rf_tech_specific_params.nfcb_poll), data); 298 break; 299 300 case NCI_NFC_F_PASSIVE_POLL_MODE: 301 data = nci_extract_rf_params_nfcf_passive_poll(ndev, 302 &(ntf.rf_tech_specific_params.nfcf_poll), data); 303 break; 304 305 default: 306 pr_err("unsupported rf_tech_and_mode 0x%x\n", 307 ntf.rf_tech_and_mode); 308 data += ntf.rf_tech_specific_params_len; 309 add_target = false; 310 } 311 } 312 313 ntf.ntf_type = *data++; 314 pr_debug("ntf_type %d\n", ntf.ntf_type); 315 316 if (add_target == true) 317 nci_add_new_target(ndev, &ntf); 318 319 if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) { 320 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES); 321 } else { 322 atomic_set(&ndev->state, NCI_W4_HOST_SELECT); 323 nfc_targets_found(ndev->nfc_dev, ndev->targets, 324 ndev->n_targets); 325 } 326 } 327 328 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev, 329 struct nci_rf_intf_activated_ntf *ntf, __u8 *data) 330 { 331 struct activation_params_nfca_poll_iso_dep *nfca_poll; 332 struct activation_params_nfcb_poll_iso_dep *nfcb_poll; 333 334 switch (ntf->activation_rf_tech_and_mode) { 335 case NCI_NFC_A_PASSIVE_POLL_MODE: 336 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep; 337 nfca_poll->rats_res_len = min_t(__u8, *data++, 20); 338 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len); 339 if (nfca_poll->rats_res_len > 0) { 340 memcpy(nfca_poll->rats_res, 341 data, nfca_poll->rats_res_len); 342 } 343 break; 344 345 case NCI_NFC_B_PASSIVE_POLL_MODE: 346 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep; 347 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50); 348 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len); 349 if (nfcb_poll->attrib_res_len > 0) { 350 memcpy(nfcb_poll->attrib_res, 351 data, nfcb_poll->attrib_res_len); 352 } 353 break; 354 355 default: 356 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", 357 ntf->activation_rf_tech_and_mode); 358 return NCI_STATUS_RF_PROTOCOL_ERROR; 359 } 360 361 return NCI_STATUS_OK; 362 } 363 364 static void nci_target_auto_activated(struct nci_dev *ndev, 365 struct nci_rf_intf_activated_ntf *ntf) 366 { 367 struct nfc_target *target; 368 int rc; 369 370 target = &ndev->targets[ndev->n_targets]; 371 372 rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol, 373 ntf->activation_rf_tech_and_mode, 374 &ntf->rf_tech_specific_params); 375 if (rc) 376 return; 377 378 target->logical_idx = ntf->rf_discovery_id; 379 ndev->n_targets++; 380 381 pr_debug("logical idx %d, n_targets %d\n", 382 target->logical_idx, ndev->n_targets); 383 384 nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets); 385 } 386 387 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev, 388 struct sk_buff *skb) 389 { 390 struct nci_rf_intf_activated_ntf ntf; 391 __u8 *data = skb->data; 392 int err = NCI_STATUS_OK; 393 394 ntf.rf_discovery_id = *data++; 395 ntf.rf_interface = *data++; 396 ntf.rf_protocol = *data++; 397 ntf.activation_rf_tech_and_mode = *data++; 398 ntf.max_data_pkt_payload_size = *data++; 399 ntf.initial_num_credits = *data++; 400 ntf.rf_tech_specific_params_len = *data++; 401 402 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id); 403 pr_debug("rf_interface 0x%x\n", ntf.rf_interface); 404 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol); 405 pr_debug("activation_rf_tech_and_mode 0x%x\n", 406 ntf.activation_rf_tech_and_mode); 407 pr_debug("max_data_pkt_payload_size 0x%x\n", 408 ntf.max_data_pkt_payload_size); 409 pr_debug("initial_num_credits 0x%x\n", 410 ntf.initial_num_credits); 411 pr_debug("rf_tech_specific_params_len %d\n", 412 ntf.rf_tech_specific_params_len); 413 414 if (ntf.rf_tech_specific_params_len > 0) { 415 switch (ntf.activation_rf_tech_and_mode) { 416 case NCI_NFC_A_PASSIVE_POLL_MODE: 417 data = nci_extract_rf_params_nfca_passive_poll(ndev, 418 &(ntf.rf_tech_specific_params.nfca_poll), data); 419 break; 420 421 case NCI_NFC_B_PASSIVE_POLL_MODE: 422 data = nci_extract_rf_params_nfcb_passive_poll(ndev, 423 &(ntf.rf_tech_specific_params.nfcb_poll), data); 424 break; 425 426 case NCI_NFC_F_PASSIVE_POLL_MODE: 427 data = nci_extract_rf_params_nfcf_passive_poll(ndev, 428 &(ntf.rf_tech_specific_params.nfcf_poll), data); 429 break; 430 431 default: 432 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", 433 ntf.activation_rf_tech_and_mode); 434 err = NCI_STATUS_RF_PROTOCOL_ERROR; 435 goto exit; 436 } 437 } 438 439 ntf.data_exch_rf_tech_and_mode = *data++; 440 ntf.data_exch_tx_bit_rate = *data++; 441 ntf.data_exch_rx_bit_rate = *data++; 442 ntf.activation_params_len = *data++; 443 444 pr_debug("data_exch_rf_tech_and_mode 0x%x\n", 445 ntf.data_exch_rf_tech_and_mode); 446 pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate); 447 pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate); 448 pr_debug("activation_params_len %d\n", ntf.activation_params_len); 449 450 if (ntf.activation_params_len > 0) { 451 switch (ntf.rf_interface) { 452 case NCI_RF_INTERFACE_ISO_DEP: 453 err = nci_extract_activation_params_iso_dep(ndev, 454 &ntf, data); 455 break; 456 457 case NCI_RF_INTERFACE_FRAME: 458 /* no activation params */ 459 break; 460 461 default: 462 pr_err("unsupported rf_interface 0x%x\n", 463 ntf.rf_interface); 464 err = NCI_STATUS_RF_PROTOCOL_ERROR; 465 break; 466 } 467 } 468 469 exit: 470 if (err == NCI_STATUS_OK) { 471 ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size; 472 ndev->initial_num_credits = ntf.initial_num_credits; 473 474 /* set the available credits to initial value */ 475 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits); 476 } 477 478 if (atomic_read(&ndev->state) == NCI_DISCOVERY) { 479 /* A single target was found and activated automatically */ 480 atomic_set(&ndev->state, NCI_POLL_ACTIVE); 481 if (err == NCI_STATUS_OK) 482 nci_target_auto_activated(ndev, &ntf); 483 } else { /* ndev->state == NCI_W4_HOST_SELECT */ 484 /* A selected target was activated, so complete the request */ 485 atomic_set(&ndev->state, NCI_POLL_ACTIVE); 486 nci_req_complete(ndev, err); 487 } 488 } 489 490 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev, 491 struct sk_buff *skb) 492 { 493 struct nci_rf_deactivate_ntf *ntf = (void *) skb->data; 494 495 pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason); 496 497 /* drop tx data queue */ 498 skb_queue_purge(&ndev->tx_q); 499 500 /* drop partial rx data packet */ 501 if (ndev->rx_data_reassembly) { 502 kfree_skb(ndev->rx_data_reassembly); 503 ndev->rx_data_reassembly = NULL; 504 } 505 506 /* complete the data exchange transaction, if exists */ 507 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 508 nci_data_exchange_complete(ndev, NULL, -EIO); 509 510 nci_clear_target_list(ndev); 511 atomic_set(&ndev->state, NCI_IDLE); 512 nci_req_complete(ndev, NCI_STATUS_OK); 513 } 514 515 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) 516 { 517 __u16 ntf_opcode = nci_opcode(skb->data); 518 519 pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 520 nci_pbf(skb->data), 521 nci_opcode_gid(ntf_opcode), 522 nci_opcode_oid(ntf_opcode), 523 nci_plen(skb->data)); 524 525 /* strip the nci control header */ 526 skb_pull(skb, NCI_CTRL_HDR_SIZE); 527 528 switch (ntf_opcode) { 529 case NCI_OP_CORE_CONN_CREDITS_NTF: 530 nci_core_conn_credits_ntf_packet(ndev, skb); 531 break; 532 533 case NCI_OP_CORE_GENERIC_ERROR_NTF: 534 nci_core_generic_error_ntf_packet(ndev, skb); 535 break; 536 537 case NCI_OP_CORE_INTF_ERROR_NTF: 538 nci_core_conn_intf_error_ntf_packet(ndev, skb); 539 break; 540 541 case NCI_OP_RF_DISCOVER_NTF: 542 nci_rf_discover_ntf_packet(ndev, skb); 543 break; 544 545 case NCI_OP_RF_INTF_ACTIVATED_NTF: 546 nci_rf_intf_activated_ntf_packet(ndev, skb); 547 break; 548 549 case NCI_OP_RF_DEACTIVATE_NTF: 550 nci_rf_deactivate_ntf_packet(ndev, skb); 551 break; 552 553 default: 554 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode); 555 break; 556 } 557 558 kfree_skb(skb); 559 } 560