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