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