1 /* 2 * NFC Digital Protocol stack 3 * Copyright (c) 2013, Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 */ 15 16 #define pr_fmt(fmt) "digital: %s: " fmt, __func__ 17 18 #include <linux/module.h> 19 20 #include "digital.h" 21 22 #define DIGITAL_PROTO_NFCA_RF_TECH \ 23 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \ 24 NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK) 25 26 #define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK 27 28 #define DIGITAL_PROTO_NFCF_RF_TECH \ 29 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK) 30 31 #define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK 32 33 struct digital_cmd { 34 struct list_head queue; 35 36 u8 type; 37 u8 pending; 38 39 u16 timeout; 40 struct sk_buff *req; 41 struct sk_buff *resp; 42 struct digital_tg_mdaa_params *mdaa_params; 43 44 nfc_digital_cmd_complete_t cmd_cb; 45 void *cb_context; 46 }; 47 48 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, 49 unsigned int len) 50 { 51 struct sk_buff *skb; 52 53 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom, 54 GFP_KERNEL); 55 if (skb) 56 skb_reserve(skb, ddev->tx_headroom); 57 58 return skb; 59 } 60 61 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, 62 u8 bitwise_inv, u8 msb_first) 63 { 64 u16 crc; 65 66 crc = crc_func(init, skb->data, skb->len); 67 68 if (bitwise_inv) 69 crc = ~crc; 70 71 if (msb_first) 72 crc = __fswab16(crc); 73 74 *skb_put(skb, 1) = crc & 0xFF; 75 *skb_put(skb, 1) = (crc >> 8) & 0xFF; 76 } 77 78 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, 79 u16 crc_init, u8 bitwise_inv, u8 msb_first) 80 { 81 int rc; 82 u16 crc; 83 84 if (skb->len <= 2) 85 return -EIO; 86 87 crc = crc_func(crc_init, skb->data, skb->len - 2); 88 89 if (bitwise_inv) 90 crc = ~crc; 91 92 if (msb_first) 93 crc = __swab16(crc); 94 95 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) + 96 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF)); 97 98 if (rc) 99 return -EIO; 100 101 skb_trim(skb, skb->len - 2); 102 103 return 0; 104 } 105 106 static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on) 107 { 108 ddev->ops->switch_rf(ddev, on); 109 } 110 111 static inline void digital_abort_cmd(struct nfc_digital_dev *ddev) 112 { 113 ddev->ops->abort_cmd(ddev); 114 } 115 116 static void digital_wq_cmd_complete(struct work_struct *work) 117 { 118 struct digital_cmd *cmd; 119 struct nfc_digital_dev *ddev = container_of(work, 120 struct nfc_digital_dev, 121 cmd_complete_work); 122 123 mutex_lock(&ddev->cmd_lock); 124 125 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, 126 queue); 127 if (!cmd) { 128 mutex_unlock(&ddev->cmd_lock); 129 return; 130 } 131 132 list_del(&cmd->queue); 133 134 mutex_unlock(&ddev->cmd_lock); 135 136 if (!IS_ERR(cmd->resp)) 137 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1, 138 cmd->resp->data, cmd->resp->len, false); 139 140 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp); 141 142 kfree(cmd->mdaa_params); 143 kfree(cmd); 144 145 schedule_work(&ddev->cmd_work); 146 } 147 148 static void digital_send_cmd_complete(struct nfc_digital_dev *ddev, 149 void *arg, struct sk_buff *resp) 150 { 151 struct digital_cmd *cmd = arg; 152 153 cmd->resp = resp; 154 155 schedule_work(&ddev->cmd_complete_work); 156 } 157 158 static void digital_wq_cmd(struct work_struct *work) 159 { 160 int rc; 161 struct digital_cmd *cmd; 162 struct digital_tg_mdaa_params *params; 163 struct nfc_digital_dev *ddev = container_of(work, 164 struct nfc_digital_dev, 165 cmd_work); 166 167 mutex_lock(&ddev->cmd_lock); 168 169 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, 170 queue); 171 if (!cmd || cmd->pending) { 172 mutex_unlock(&ddev->cmd_lock); 173 return; 174 } 175 176 mutex_unlock(&ddev->cmd_lock); 177 178 if (cmd->req) 179 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1, 180 cmd->req->data, cmd->req->len, false); 181 182 switch (cmd->type) { 183 case DIGITAL_CMD_IN_SEND: 184 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout, 185 digital_send_cmd_complete, cmd); 186 break; 187 188 case DIGITAL_CMD_TG_SEND: 189 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout, 190 digital_send_cmd_complete, cmd); 191 break; 192 193 case DIGITAL_CMD_TG_LISTEN: 194 rc = ddev->ops->tg_listen(ddev, cmd->timeout, 195 digital_send_cmd_complete, cmd); 196 break; 197 198 case DIGITAL_CMD_TG_LISTEN_MDAA: 199 params = cmd->mdaa_params; 200 201 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout, 202 digital_send_cmd_complete, cmd); 203 break; 204 205 case DIGITAL_CMD_TG_LISTEN_MD: 206 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout, 207 digital_send_cmd_complete, cmd); 208 break; 209 210 default: 211 pr_err("Unknown cmd type %d\n", cmd->type); 212 return; 213 } 214 215 if (!rc) 216 return; 217 218 pr_err("in_send_command returned err %d\n", rc); 219 220 mutex_lock(&ddev->cmd_lock); 221 list_del(&cmd->queue); 222 mutex_unlock(&ddev->cmd_lock); 223 224 kfree_skb(cmd->req); 225 kfree(cmd->mdaa_params); 226 kfree(cmd); 227 228 schedule_work(&ddev->cmd_work); 229 } 230 231 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, 232 struct sk_buff *skb, struct digital_tg_mdaa_params *params, 233 u16 timeout, nfc_digital_cmd_complete_t cmd_cb, 234 void *cb_context) 235 { 236 struct digital_cmd *cmd; 237 238 cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL); 239 if (!cmd) 240 return -ENOMEM; 241 242 cmd->type = cmd_type; 243 cmd->timeout = timeout; 244 cmd->req = skb; 245 cmd->mdaa_params = params; 246 cmd->cmd_cb = cmd_cb; 247 cmd->cb_context = cb_context; 248 INIT_LIST_HEAD(&cmd->queue); 249 250 mutex_lock(&ddev->cmd_lock); 251 list_add_tail(&cmd->queue, &ddev->cmd_queue); 252 mutex_unlock(&ddev->cmd_lock); 253 254 schedule_work(&ddev->cmd_work); 255 256 return 0; 257 } 258 259 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param) 260 { 261 int rc; 262 263 rc = ddev->ops->in_configure_hw(ddev, type, param); 264 if (rc) 265 pr_err("in_configure_hw failed: %d\n", rc); 266 267 return rc; 268 } 269 270 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param) 271 { 272 int rc; 273 274 rc = ddev->ops->tg_configure_hw(ddev, type, param); 275 if (rc) 276 pr_err("tg_configure_hw failed: %d\n", rc); 277 278 return rc; 279 } 280 281 static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech) 282 { 283 struct digital_tg_mdaa_params *params; 284 285 params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL); 286 if (!params) 287 return -ENOMEM; 288 289 params->sens_res = DIGITAL_SENS_RES_NFC_DEP; 290 get_random_bytes(params->nfcid1, sizeof(params->nfcid1)); 291 params->sel_res = DIGITAL_SEL_RES_NFC_DEP; 292 293 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; 294 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; 295 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); 296 params->sc = DIGITAL_SENSF_FELICA_SC; 297 298 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, 299 500, digital_tg_recv_atr_req, NULL); 300 } 301 302 static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech) 303 { 304 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500, 305 digital_tg_recv_md_req, NULL); 306 } 307 308 int digital_target_found(struct nfc_digital_dev *ddev, 309 struct nfc_target *target, u8 protocol) 310 { 311 int rc; 312 u8 framing; 313 u8 rf_tech; 314 u8 poll_tech_count; 315 int (*check_crc)(struct sk_buff *skb); 316 void (*add_crc)(struct sk_buff *skb); 317 318 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech; 319 320 switch (protocol) { 321 case NFC_PROTO_JEWEL: 322 framing = NFC_DIGITAL_FRAMING_NFCA_T1T; 323 check_crc = digital_skb_check_crc_b; 324 add_crc = digital_skb_add_crc_b; 325 break; 326 327 case NFC_PROTO_MIFARE: 328 framing = NFC_DIGITAL_FRAMING_NFCA_T2T; 329 check_crc = digital_skb_check_crc_a; 330 add_crc = digital_skb_add_crc_a; 331 break; 332 333 case NFC_PROTO_FELICA: 334 framing = NFC_DIGITAL_FRAMING_NFCF_T3T; 335 check_crc = digital_skb_check_crc_f; 336 add_crc = digital_skb_add_crc_f; 337 break; 338 339 case NFC_PROTO_NFC_DEP: 340 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) { 341 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP; 342 check_crc = digital_skb_check_crc_a; 343 add_crc = digital_skb_add_crc_a; 344 } else { 345 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP; 346 check_crc = digital_skb_check_crc_f; 347 add_crc = digital_skb_add_crc_f; 348 } 349 break; 350 351 case NFC_PROTO_ISO15693: 352 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T; 353 check_crc = digital_skb_check_crc_b; 354 add_crc = digital_skb_add_crc_b; 355 break; 356 357 case NFC_PROTO_ISO14443: 358 framing = NFC_DIGITAL_FRAMING_NFCA_T4T; 359 check_crc = digital_skb_check_crc_a; 360 add_crc = digital_skb_add_crc_a; 361 break; 362 363 case NFC_PROTO_ISO14443_B: 364 framing = NFC_DIGITAL_FRAMING_NFCB_T4T; 365 check_crc = digital_skb_check_crc_b; 366 add_crc = digital_skb_add_crc_b; 367 break; 368 369 default: 370 pr_err("Invalid protocol %d\n", protocol); 371 return -EINVAL; 372 } 373 374 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol); 375 376 ddev->curr_rf_tech = rf_tech; 377 378 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { 379 ddev->skb_add_crc = digital_skb_add_crc_none; 380 ddev->skb_check_crc = digital_skb_check_crc_none; 381 } else { 382 ddev->skb_add_crc = add_crc; 383 ddev->skb_check_crc = check_crc; 384 } 385 386 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing); 387 if (rc) 388 return rc; 389 390 target->supported_protocols = (1 << protocol); 391 392 poll_tech_count = ddev->poll_tech_count; 393 ddev->poll_tech_count = 0; 394 395 rc = nfc_targets_found(ddev->nfc_dev, target, 1); 396 if (rc) { 397 ddev->poll_tech_count = poll_tech_count; 398 return rc; 399 } 400 401 return 0; 402 } 403 404 void digital_poll_next_tech(struct nfc_digital_dev *ddev) 405 { 406 u8 rand_mod; 407 408 digital_switch_rf(ddev, 0); 409 410 mutex_lock(&ddev->poll_lock); 411 412 if (!ddev->poll_tech_count) { 413 mutex_unlock(&ddev->poll_lock); 414 return; 415 } 416 417 get_random_bytes(&rand_mod, sizeof(rand_mod)); 418 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count; 419 420 mutex_unlock(&ddev->poll_lock); 421 422 schedule_work(&ddev->poll_work); 423 } 424 425 static void digital_wq_poll(struct work_struct *work) 426 { 427 int rc; 428 struct digital_poll_tech *poll_tech; 429 struct nfc_digital_dev *ddev = container_of(work, 430 struct nfc_digital_dev, 431 poll_work); 432 mutex_lock(&ddev->poll_lock); 433 434 if (!ddev->poll_tech_count) { 435 mutex_unlock(&ddev->poll_lock); 436 return; 437 } 438 439 poll_tech = &ddev->poll_techs[ddev->poll_tech_index]; 440 441 mutex_unlock(&ddev->poll_lock); 442 443 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech); 444 if (rc) 445 digital_poll_next_tech(ddev); 446 } 447 448 static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech, 449 digital_poll_t poll_func) 450 { 451 struct digital_poll_tech *poll_tech; 452 453 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX) 454 return; 455 456 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++]; 457 458 poll_tech->rf_tech = rf_tech; 459 poll_tech->poll_func = poll_func; 460 } 461 462 /** 463 * start_poll operation 464 * 465 * For every supported protocol, the corresponding polling function is added 466 * to the table of polling technologies (ddev->poll_techs[]) using 467 * digital_add_poll_tech(). 468 * When a polling function fails (by timeout or protocol error) the next one is 469 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work). 470 */ 471 static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols, 472 __u32 tm_protocols) 473 { 474 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 475 u32 matching_im_protocols, matching_tm_protocols; 476 477 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols, 478 tm_protocols, ddev->protocols); 479 480 matching_im_protocols = ddev->protocols & im_protocols; 481 matching_tm_protocols = ddev->protocols & tm_protocols; 482 483 if (!matching_im_protocols && !matching_tm_protocols) { 484 pr_err("Unknown protocol\n"); 485 return -EINVAL; 486 } 487 488 if (ddev->poll_tech_count) { 489 pr_err("Already polling\n"); 490 return -EBUSY; 491 } 492 493 if (ddev->curr_protocol) { 494 pr_err("A target is already active\n"); 495 return -EBUSY; 496 } 497 498 ddev->poll_tech_count = 0; 499 ddev->poll_tech_index = 0; 500 501 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH) 502 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, 503 digital_in_send_sens_req); 504 505 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH) 506 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B, 507 digital_in_send_sensb_req); 508 509 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) { 510 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, 511 digital_in_send_sensf_req); 512 513 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, 514 digital_in_send_sensf_req); 515 } 516 517 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH) 518 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693, 519 digital_in_send_iso15693_inv_req); 520 521 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) { 522 if (ddev->ops->tg_listen_mdaa) { 523 digital_add_poll_tech(ddev, 0, 524 digital_tg_listen_mdaa); 525 } else if (ddev->ops->tg_listen_md) { 526 digital_add_poll_tech(ddev, 0, 527 digital_tg_listen_md); 528 } else { 529 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, 530 digital_tg_listen_nfca); 531 532 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, 533 digital_tg_listen_nfcf); 534 535 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, 536 digital_tg_listen_nfcf); 537 } 538 } 539 540 if (!ddev->poll_tech_count) { 541 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n", 542 matching_im_protocols, matching_tm_protocols); 543 return -EINVAL; 544 } 545 546 schedule_work(&ddev->poll_work); 547 548 return 0; 549 } 550 551 static void digital_stop_poll(struct nfc_dev *nfc_dev) 552 { 553 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 554 555 mutex_lock(&ddev->poll_lock); 556 557 if (!ddev->poll_tech_count) { 558 pr_err("Polling operation was not running\n"); 559 mutex_unlock(&ddev->poll_lock); 560 return; 561 } 562 563 ddev->poll_tech_count = 0; 564 565 mutex_unlock(&ddev->poll_lock); 566 567 cancel_work_sync(&ddev->poll_work); 568 569 digital_abort_cmd(ddev); 570 } 571 572 static int digital_dev_up(struct nfc_dev *nfc_dev) 573 { 574 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 575 576 digital_switch_rf(ddev, 1); 577 578 return 0; 579 } 580 581 static int digital_dev_down(struct nfc_dev *nfc_dev) 582 { 583 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 584 585 digital_switch_rf(ddev, 0); 586 587 return 0; 588 } 589 590 static int digital_dep_link_up(struct nfc_dev *nfc_dev, 591 struct nfc_target *target, 592 __u8 comm_mode, __u8 *gb, size_t gb_len) 593 { 594 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 595 int rc; 596 597 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len); 598 599 if (!rc) 600 ddev->curr_protocol = NFC_PROTO_NFC_DEP; 601 602 return rc; 603 } 604 605 static int digital_dep_link_down(struct nfc_dev *nfc_dev) 606 { 607 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 608 609 ddev->curr_protocol = 0; 610 611 return 0; 612 } 613 614 static int digital_activate_target(struct nfc_dev *nfc_dev, 615 struct nfc_target *target, __u32 protocol) 616 { 617 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 618 619 if (ddev->poll_tech_count) { 620 pr_err("Can't activate a target while polling\n"); 621 return -EBUSY; 622 } 623 624 if (ddev->curr_protocol) { 625 pr_err("A target is already active\n"); 626 return -EBUSY; 627 } 628 629 ddev->curr_protocol = protocol; 630 631 return 0; 632 } 633 634 static void digital_deactivate_target(struct nfc_dev *nfc_dev, 635 struct nfc_target *target, 636 u8 mode) 637 { 638 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 639 640 if (!ddev->curr_protocol) { 641 pr_err("No active target\n"); 642 return; 643 } 644 645 ddev->curr_protocol = 0; 646 } 647 648 static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb) 649 { 650 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev); 651 652 return digital_tg_send_dep_res(ddev, skb); 653 } 654 655 static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg, 656 struct sk_buff *resp) 657 { 658 struct digital_data_exch *data_exch = arg; 659 int rc; 660 661 if (IS_ERR(resp)) { 662 rc = PTR_ERR(resp); 663 resp = NULL; 664 goto done; 665 } 666 667 if (ddev->curr_protocol == NFC_PROTO_MIFARE) { 668 rc = digital_in_recv_mifare_res(resp); 669 /* crc check is done in digital_in_recv_mifare_res() */ 670 goto done; 671 } 672 673 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || 674 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { 675 rc = digital_in_iso_dep_pull_sod(ddev, resp); 676 if (rc) 677 goto done; 678 } 679 680 rc = ddev->skb_check_crc(resp); 681 682 done: 683 if (rc) { 684 kfree_skb(resp); 685 resp = NULL; 686 } 687 688 data_exch->cb(data_exch->cb_context, resp, rc); 689 690 kfree(data_exch); 691 } 692 693 static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target, 694 struct sk_buff *skb, data_exchange_cb_t cb, 695 void *cb_context) 696 { 697 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 698 struct digital_data_exch *data_exch; 699 int rc; 700 701 data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL); 702 if (!data_exch) { 703 pr_err("Failed to allocate data_exch struct\n"); 704 return -ENOMEM; 705 } 706 707 data_exch->cb = cb; 708 data_exch->cb_context = cb_context; 709 710 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) { 711 rc = digital_in_send_dep_req(ddev, target, skb, data_exch); 712 goto exit; 713 } 714 715 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || 716 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { 717 rc = digital_in_iso_dep_push_sod(ddev, skb); 718 if (rc) 719 goto exit; 720 } 721 722 ddev->skb_add_crc(skb); 723 724 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete, 725 data_exch); 726 727 exit: 728 if (rc) 729 kfree(data_exch); 730 731 return rc; 732 } 733 734 static struct nfc_ops digital_nfc_ops = { 735 .dev_up = digital_dev_up, 736 .dev_down = digital_dev_down, 737 .start_poll = digital_start_poll, 738 .stop_poll = digital_stop_poll, 739 .dep_link_up = digital_dep_link_up, 740 .dep_link_down = digital_dep_link_down, 741 .activate_target = digital_activate_target, 742 .deactivate_target = digital_deactivate_target, 743 .tm_send = digital_tg_send, 744 .im_transceive = digital_in_send, 745 }; 746 747 struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops, 748 __u32 supported_protocols, 749 __u32 driver_capabilities, 750 int tx_headroom, int tx_tailroom) 751 { 752 struct nfc_digital_dev *ddev; 753 754 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen || 755 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd || 756 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech)) 757 return NULL; 758 759 ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL); 760 if (!ddev) 761 return NULL; 762 763 ddev->driver_capabilities = driver_capabilities; 764 ddev->ops = ops; 765 766 mutex_init(&ddev->cmd_lock); 767 INIT_LIST_HEAD(&ddev->cmd_queue); 768 769 INIT_WORK(&ddev->cmd_work, digital_wq_cmd); 770 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete); 771 772 mutex_init(&ddev->poll_lock); 773 INIT_WORK(&ddev->poll_work, digital_wq_poll); 774 775 if (supported_protocols & NFC_PROTO_JEWEL_MASK) 776 ddev->protocols |= NFC_PROTO_JEWEL_MASK; 777 if (supported_protocols & NFC_PROTO_MIFARE_MASK) 778 ddev->protocols |= NFC_PROTO_MIFARE_MASK; 779 if (supported_protocols & NFC_PROTO_FELICA_MASK) 780 ddev->protocols |= NFC_PROTO_FELICA_MASK; 781 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) 782 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; 783 if (supported_protocols & NFC_PROTO_ISO15693_MASK) 784 ddev->protocols |= NFC_PROTO_ISO15693_MASK; 785 if (supported_protocols & NFC_PROTO_ISO14443_MASK) 786 ddev->protocols |= NFC_PROTO_ISO14443_MASK; 787 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK) 788 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK; 789 790 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; 791 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; 792 793 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols, 794 ddev->tx_headroom, 795 ddev->tx_tailroom); 796 if (!ddev->nfc_dev) { 797 pr_err("nfc_allocate_device failed\n"); 798 goto free_dev; 799 } 800 801 nfc_set_drvdata(ddev->nfc_dev, ddev); 802 803 return ddev; 804 805 free_dev: 806 kfree(ddev); 807 808 return NULL; 809 } 810 EXPORT_SYMBOL(nfc_digital_allocate_device); 811 812 void nfc_digital_free_device(struct nfc_digital_dev *ddev) 813 { 814 nfc_free_device(ddev->nfc_dev); 815 kfree(ddev); 816 } 817 EXPORT_SYMBOL(nfc_digital_free_device); 818 819 int nfc_digital_register_device(struct nfc_digital_dev *ddev) 820 { 821 return nfc_register_device(ddev->nfc_dev); 822 } 823 EXPORT_SYMBOL(nfc_digital_register_device); 824 825 void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) 826 { 827 struct digital_cmd *cmd, *n; 828 829 nfc_unregister_device(ddev->nfc_dev); 830 831 mutex_lock(&ddev->poll_lock); 832 ddev->poll_tech_count = 0; 833 mutex_unlock(&ddev->poll_lock); 834 835 cancel_work_sync(&ddev->poll_work); 836 cancel_work_sync(&ddev->cmd_work); 837 cancel_work_sync(&ddev->cmd_complete_work); 838 839 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { 840 list_del(&cmd->queue); 841 kfree(cmd->mdaa_params); 842 kfree(cmd); 843 } 844 } 845 EXPORT_SYMBOL(nfc_digital_unregister_device); 846 847 MODULE_LICENSE("GPL"); 848