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