ntf.c revision eb9bc6e9a0ac668d2283b8fea1534f8ba31d1692
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 42static 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 74static 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 88static 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 102static __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 129static __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 143static __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 159static 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 222static 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->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->idx = ntf->rf_discovery_id; 252 ndev->n_targets++; 253 254 pr_debug("target_idx %d, n_targets %d\n", target->idx, 255 ndev->n_targets); 256 } 257} 258 259void 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 267static 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 325static 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 361static 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->idx = ntf->rf_discovery_id; 376 ndev->n_targets++; 377 378 pr_debug("target_idx %d, n_targets %d\n", target->idx, ndev->n_targets); 379 380 nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets); 381} 382 383static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev, 384 struct sk_buff *skb) 385{ 386 struct nci_rf_intf_activated_ntf ntf; 387 __u8 *data = skb->data; 388 int err = NCI_STATUS_OK; 389 390 ntf.rf_discovery_id = *data++; 391 ntf.rf_interface = *data++; 392 ntf.rf_protocol = *data++; 393 ntf.activation_rf_tech_and_mode = *data++; 394 ntf.max_data_pkt_payload_size = *data++; 395 ntf.initial_num_credits = *data++; 396 ntf.rf_tech_specific_params_len = *data++; 397 398 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id); 399 pr_debug("rf_interface 0x%x\n", ntf.rf_interface); 400 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol); 401 pr_debug("activation_rf_tech_and_mode 0x%x\n", 402 ntf.activation_rf_tech_and_mode); 403 pr_debug("max_data_pkt_payload_size 0x%x\n", 404 ntf.max_data_pkt_payload_size); 405 pr_debug("initial_num_credits 0x%x\n", 406 ntf.initial_num_credits); 407 pr_debug("rf_tech_specific_params_len %d\n", 408 ntf.rf_tech_specific_params_len); 409 410 if (ntf.rf_tech_specific_params_len > 0) { 411 switch (ntf.activation_rf_tech_and_mode) { 412 case NCI_NFC_A_PASSIVE_POLL_MODE: 413 data = nci_extract_rf_params_nfca_passive_poll(ndev, 414 &(ntf.rf_tech_specific_params.nfca_poll), data); 415 break; 416 417 case NCI_NFC_B_PASSIVE_POLL_MODE: 418 data = nci_extract_rf_params_nfcb_passive_poll(ndev, 419 &(ntf.rf_tech_specific_params.nfcb_poll), data); 420 break; 421 422 case NCI_NFC_F_PASSIVE_POLL_MODE: 423 data = nci_extract_rf_params_nfcf_passive_poll(ndev, 424 &(ntf.rf_tech_specific_params.nfcf_poll), data); 425 break; 426 427 default: 428 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n", 429 ntf.activation_rf_tech_and_mode); 430 err = NCI_STATUS_RF_PROTOCOL_ERROR; 431 goto exit; 432 } 433 } 434 435 ntf.data_exch_rf_tech_and_mode = *data++; 436 ntf.data_exch_tx_bit_rate = *data++; 437 ntf.data_exch_rx_bit_rate = *data++; 438 ntf.activation_params_len = *data++; 439 440 pr_debug("data_exch_rf_tech_and_mode 0x%x\n", 441 ntf.data_exch_rf_tech_and_mode); 442 pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate); 443 pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate); 444 pr_debug("activation_params_len %d\n", ntf.activation_params_len); 445 446 if (ntf.activation_params_len > 0) { 447 switch (ntf.rf_interface) { 448 case NCI_RF_INTERFACE_ISO_DEP: 449 err = nci_extract_activation_params_iso_dep(ndev, 450 &ntf, data); 451 break; 452 453 case NCI_RF_INTERFACE_FRAME: 454 /* no activation params */ 455 break; 456 457 default: 458 pr_err("unsupported rf_interface 0x%x\n", 459 ntf.rf_interface); 460 err = NCI_STATUS_RF_PROTOCOL_ERROR; 461 break; 462 } 463 } 464 465exit: 466 if (err == NCI_STATUS_OK) { 467 ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size; 468 ndev->initial_num_credits = ntf.initial_num_credits; 469 470 /* set the available credits to initial value */ 471 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits); 472 } 473 474 if (atomic_read(&ndev->state) == NCI_DISCOVERY) { 475 /* A single target was found and activated automatically */ 476 atomic_set(&ndev->state, NCI_POLL_ACTIVE); 477 if (err == NCI_STATUS_OK) 478 nci_target_auto_activated(ndev, &ntf); 479 } else { /* ndev->state == NCI_W4_HOST_SELECT */ 480 /* A selected target was activated, so complete the request */ 481 atomic_set(&ndev->state, NCI_POLL_ACTIVE); 482 nci_req_complete(ndev, err); 483 } 484} 485 486static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev, 487 struct sk_buff *skb) 488{ 489 struct nci_rf_deactivate_ntf *ntf = (void *) skb->data; 490 491 pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason); 492 493 /* drop tx data queue */ 494 skb_queue_purge(&ndev->tx_q); 495 496 /* drop partial rx data packet */ 497 if (ndev->rx_data_reassembly) { 498 kfree_skb(ndev->rx_data_reassembly); 499 ndev->rx_data_reassembly = 0; 500 } 501 502 /* complete the data exchange transaction, if exists */ 503 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 504 nci_data_exchange_complete(ndev, NULL, -EIO); 505 506 nci_clear_target_list(ndev); 507 atomic_set(&ndev->state, NCI_IDLE); 508 nci_req_complete(ndev, NCI_STATUS_OK); 509} 510 511void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) 512{ 513 __u16 ntf_opcode = nci_opcode(skb->data); 514 515 pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 516 nci_pbf(skb->data), 517 nci_opcode_gid(ntf_opcode), 518 nci_opcode_oid(ntf_opcode), 519 nci_plen(skb->data)); 520 521 /* strip the nci control header */ 522 skb_pull(skb, NCI_CTRL_HDR_SIZE); 523 524 switch (ntf_opcode) { 525 case NCI_OP_CORE_CONN_CREDITS_NTF: 526 nci_core_conn_credits_ntf_packet(ndev, skb); 527 break; 528 529 case NCI_OP_CORE_GENERIC_ERROR_NTF: 530 nci_core_generic_error_ntf_packet(ndev, skb); 531 break; 532 533 case NCI_OP_CORE_INTF_ERROR_NTF: 534 nci_core_conn_intf_error_ntf_packet(ndev, skb); 535 break; 536 537 case NCI_OP_RF_DISCOVER_NTF: 538 nci_rf_discover_ntf_packet(ndev, skb); 539 break; 540 541 case NCI_OP_RF_INTF_ACTIVATED_NTF: 542 nci_rf_intf_activated_ntf_packet(ndev, skb); 543 break; 544 545 case NCI_OP_RF_DEACTIVATE_NTF: 546 nci_rf_deactivate_ntf_packet(ndev, skb); 547 break; 548 549 default: 550 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode); 551 break; 552 } 553 554 kfree_skb(skb); 555} 556