1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NFC Digital Protocol stack 4 * Copyright (c) 2013, Intel Corporation. 5 */ 6 7 #define pr_fmt(fmt) "digital: %s: " fmt, __func__ 8 9 #include <linux/module.h> 10 11 #include "digital.h" 12 13 #define DIGITAL_PROTO_NFCA_RF_TECH \ 14 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \ 15 NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK) 16 17 #define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK 18 19 #define DIGITAL_PROTO_NFCF_RF_TECH \ 20 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK) 21 22 #define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK 23 24 /* Delay between each poll frame (ms) */ 25 #define DIGITAL_POLL_INTERVAL 10 26 27 struct digital_cmd { 28 struct list_head queue; 29 30 u8 type; 31 u8 pending; 32 33 u16 timeout; 34 struct sk_buff *req; 35 struct sk_buff *resp; 36 struct digital_tg_mdaa_params *mdaa_params; 37 38 nfc_digital_cmd_complete_t cmd_cb; 39 void *cb_context; 40 }; 41 42 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, 43 unsigned int len) 44 { 45 struct sk_buff *skb; 46 47 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom, 48 GFP_KERNEL); 49 if (skb) 50 skb_reserve(skb, ddev->tx_headroom); 51 52 return skb; 53 } 54 55 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, 56 u8 bitwise_inv, u8 msb_first) 57 { 58 u16 crc; 59 60 crc = crc_func(init, skb->data, skb->len); 61 62 if (bitwise_inv) 63 crc = ~crc; 64 65 if (msb_first) 66 crc = __fswab16(crc); 67 68 skb_put_u8(skb, crc & 0xFF); 69 skb_put_u8(skb, (crc >> 8) & 0xFF); 70 } 71 72 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, 73 u16 crc_init, u8 bitwise_inv, u8 msb_first) 74 { 75 int rc; 76 u16 crc; 77 78 if (skb->len <= 2) 79 return -EIO; 80 81 crc = crc_func(crc_init, skb->data, skb->len - 2); 82 83 if (bitwise_inv) 84 crc = ~crc; 85 86 if (msb_first) 87 crc = __swab16(crc); 88 89 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) + 90 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF)); 91 92 if (rc) 93 return -EIO; 94 95 skb_trim(skb, skb->len - 2); 96 97 return 0; 98 } 99 100 static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on) 101 { 102 ddev->ops->switch_rf(ddev, on); 103 } 104 105 static inline void digital_abort_cmd(struct nfc_digital_dev *ddev) 106 { 107 ddev->ops->abort_cmd(ddev); 108 } 109 110 static void digital_wq_cmd_complete(struct work_struct *work) 111 { 112 struct digital_cmd *cmd; 113 struct nfc_digital_dev *ddev = container_of(work, 114 struct nfc_digital_dev, 115 cmd_complete_work); 116 117 mutex_lock(&ddev->cmd_lock); 118 119 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, 120 queue); 121 if (!cmd) { 122 mutex_unlock(&ddev->cmd_lock); 123 return; 124 } 125 126 list_del(&cmd->queue); 127 128 mutex_unlock(&ddev->cmd_lock); 129 130 if (!IS_ERR(cmd->resp)) 131 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1, 132 cmd->resp->data, cmd->resp->len, false); 133 134 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp); 135 136 kfree(cmd->mdaa_params); 137 kfree(cmd); 138 139 schedule_work(&ddev->cmd_work); 140 } 141 142 static void digital_send_cmd_complete(struct nfc_digital_dev *ddev, 143 void *arg, struct sk_buff *resp) 144 { 145 struct digital_cmd *cmd = arg; 146 147 cmd->resp = resp; 148 149 schedule_work(&ddev->cmd_complete_work); 150 } 151 152 static void digital_wq_cmd(struct work_struct *work) 153 { 154 int rc; 155 struct digital_cmd *cmd; 156 struct digital_tg_mdaa_params *params; 157 struct nfc_digital_dev *ddev = container_of(work, 158 struct nfc_digital_dev, 159 cmd_work); 160 161 mutex_lock(&ddev->cmd_lock); 162 163 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, 164 queue); 165 if (!cmd || cmd->pending) { 166 mutex_unlock(&ddev->cmd_lock); 167 return; 168 } 169 170 cmd->pending = 1; 171 172 mutex_unlock(&ddev->cmd_lock); 173 174 if (cmd->req) 175 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1, 176 cmd->req->data, cmd->req->len, false); 177 178 switch (cmd->type) { 179 case DIGITAL_CMD_IN_SEND: 180 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout, 181 digital_send_cmd_complete, cmd); 182 break; 183 184 case DIGITAL_CMD_TG_SEND: 185 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout, 186 digital_send_cmd_complete, cmd); 187 break; 188 189 case DIGITAL_CMD_TG_LISTEN: 190 rc = ddev->ops->tg_listen(ddev, cmd->timeout, 191 digital_send_cmd_complete, cmd); 192 break; 193 194 case DIGITAL_CMD_TG_LISTEN_MDAA: 195 params = cmd->mdaa_params; 196 197 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout, 198 digital_send_cmd_complete, cmd); 199 break; 200 201 case DIGITAL_CMD_TG_LISTEN_MD: 202 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout, 203 digital_send_cmd_complete, cmd); 204 break; 205 206 default: 207 pr_err("Unknown cmd type %d\n", cmd->type); 208 return; 209 } 210 211 if (!rc) 212 return; 213 214 pr_err("in_send_command returned err %d\n", rc); 215 216 mutex_lock(&ddev->cmd_lock); 217 list_del(&cmd->queue); 218 mutex_unlock(&ddev->cmd_lock); 219 220 kfree_skb(cmd->req); 221 kfree(cmd->mdaa_params); 222 kfree(cmd); 223 224 schedule_work(&ddev->cmd_work); 225 } 226 227 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, 228 struct sk_buff *skb, struct digital_tg_mdaa_params *params, 229 u16 timeout, nfc_digital_cmd_complete_t cmd_cb, 230 void *cb_context) 231 { 232 struct digital_cmd *cmd; 233 234 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); 235 if (!cmd) 236 return -ENOMEM; 237 238 cmd->type = cmd_type; 239 cmd->timeout = timeout; 240 cmd->req = skb; 241 cmd->mdaa_params = params; 242 cmd->cmd_cb = cmd_cb; 243 cmd->cb_context = cb_context; 244 INIT_LIST_HEAD(&cmd->queue); 245 246 mutex_lock(&ddev->cmd_lock); 247 list_add_tail(&cmd->queue, &ddev->cmd_queue); 248 mutex_unlock(&ddev->cmd_lock); 249 250 schedule_work(&ddev->cmd_work); 251 252 return 0; 253 } 254 255 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param) 256 { 257 int rc; 258 259 rc = ddev->ops->in_configure_hw(ddev, type, param); 260 if (rc) 261 pr_err("in_configure_hw failed: %d\n", rc); 262 263 return rc; 264 } 265 266 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param) 267 { 268 int rc; 269 270 rc = ddev->ops->tg_configure_hw(ddev, type, param); 271 if (rc) 272 pr_err("tg_configure_hw failed: %d\n", rc); 273 274 return rc; 275 } 276 277 static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech) 278 { 279 struct digital_tg_mdaa_params *params; 280 281 params = kzalloc(sizeof(*params), GFP_KERNEL); 282 if (!params) 283 return -ENOMEM; 284 285 params->sens_res = DIGITAL_SENS_RES_NFC_DEP; 286 get_random_bytes(params->nfcid1, sizeof(params->nfcid1)); 287 params->sel_res = DIGITAL_SEL_RES_NFC_DEP; 288 289 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; 290 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; 291 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); 292 params->sc = DIGITAL_SENSF_FELICA_SC; 293 294 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, 295 500, digital_tg_recv_atr_req, NULL); 296 } 297 298 static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech) 299 { 300 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500, 301 digital_tg_recv_md_req, NULL); 302 } 303 304 int digital_target_found(struct nfc_digital_dev *ddev, 305 struct nfc_target *target, u8 protocol) 306 { 307 int rc; 308 u8 framing; 309 u8 rf_tech; 310 u8 poll_tech_count; 311 int (*check_crc)(struct sk_buff *skb); 312 void (*add_crc)(struct sk_buff *skb); 313 314 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech; 315 316 switch (protocol) { 317 case NFC_PROTO_JEWEL: 318 framing = NFC_DIGITAL_FRAMING_NFCA_T1T; 319 check_crc = digital_skb_check_crc_b; 320 add_crc = digital_skb_add_crc_b; 321 break; 322 323 case NFC_PROTO_MIFARE: 324 framing = NFC_DIGITAL_FRAMING_NFCA_T2T; 325 check_crc = digital_skb_check_crc_a; 326 add_crc = digital_skb_add_crc_a; 327 break; 328 329 case NFC_PROTO_FELICA: 330 framing = NFC_DIGITAL_FRAMING_NFCF_T3T; 331 check_crc = digital_skb_check_crc_f; 332 add_crc = digital_skb_add_crc_f; 333 break; 334 335 case NFC_PROTO_NFC_DEP: 336 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) { 337 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP; 338 check_crc = digital_skb_check_crc_a; 339 add_crc = digital_skb_add_crc_a; 340 } else { 341 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP; 342 check_crc = digital_skb_check_crc_f; 343 add_crc = digital_skb_add_crc_f; 344 } 345 break; 346 347 case NFC_PROTO_ISO15693: 348 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T; 349 check_crc = digital_skb_check_crc_b; 350 add_crc = digital_skb_add_crc_b; 351 break; 352 353 case NFC_PROTO_ISO14443: 354 framing = NFC_DIGITAL_FRAMING_NFCA_T4T; 355 check_crc = digital_skb_check_crc_a; 356 add_crc = digital_skb_add_crc_a; 357 break; 358 359 case NFC_PROTO_ISO14443_B: 360 framing = NFC_DIGITAL_FRAMING_NFCB_T4T; 361 check_crc = digital_skb_check_crc_b; 362 add_crc = digital_skb_add_crc_b; 363 break; 364 365 default: 366 pr_err("Invalid protocol %d\n", protocol); 367 return -EINVAL; 368 } 369 370 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol); 371 372 ddev->curr_rf_tech = rf_tech; 373 374 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { 375 ddev->skb_add_crc = digital_skb_add_crc_none; 376 ddev->skb_check_crc = digital_skb_check_crc_none; 377 } else { 378 ddev->skb_add_crc = add_crc; 379 ddev->skb_check_crc = check_crc; 380 } 381 382 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing); 383 if (rc) 384 return rc; 385 386 target->supported_protocols = (1 << protocol); 387 388 poll_tech_count = ddev->poll_tech_count; 389 ddev->poll_tech_count = 0; 390 391 rc = nfc_targets_found(ddev->nfc_dev, target, 1); 392 if (rc) { 393 ddev->poll_tech_count = poll_tech_count; 394 return rc; 395 } 396 397 return 0; 398 } 399 400 void digital_poll_next_tech(struct nfc_digital_dev *ddev) 401 { 402 u8 rand_mod; 403 404 digital_switch_rf(ddev, 0); 405 406 mutex_lock(&ddev->poll_lock); 407 408 if (!ddev->poll_tech_count) { 409 mutex_unlock(&ddev->poll_lock); 410 return; 411 } 412 413 get_random_bytes(&rand_mod, sizeof(rand_mod)); 414 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count; 415 416 mutex_unlock(&ddev->poll_lock); 417 418 schedule_delayed_work(&ddev->poll_work, 419 msecs_to_jiffies(DIGITAL_POLL_INTERVAL)); 420 } 421 422 static void digital_wq_poll(struct work_struct *work) 423 { 424 int rc; 425 struct digital_poll_tech *poll_tech; 426 struct nfc_digital_dev *ddev = container_of(work, 427 struct nfc_digital_dev, 428 poll_work.work); 429 mutex_lock(&ddev->poll_lock); 430 431 if (!ddev->poll_tech_count) { 432 mutex_unlock(&ddev->poll_lock); 433 return; 434 } 435 436 poll_tech = &ddev->poll_techs[ddev->poll_tech_index]; 437 438 mutex_unlock(&ddev->poll_lock); 439 440 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech); 441 if (rc) 442 digital_poll_next_tech(ddev); 443 } 444 445 static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech, 446 digital_poll_t poll_func) 447 { 448 struct digital_poll_tech *poll_tech; 449 450 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX) 451 return; 452 453 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++]; 454 455 poll_tech->rf_tech = rf_tech; 456 poll_tech->poll_func = poll_func; 457 } 458 459 /** 460 * start_poll operation 461 * 462 * For every supported protocol, the corresponding polling function is added 463 * to the table of polling technologies (ddev->poll_techs[]) using 464 * digital_add_poll_tech(). 465 * When a polling function fails (by timeout or protocol error) the next one is 466 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work). 467 */ 468 static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols, 469 __u32 tm_protocols) 470 { 471 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 472 u32 matching_im_protocols, matching_tm_protocols; 473 474 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols, 475 tm_protocols, ddev->protocols); 476 477 matching_im_protocols = ddev->protocols & im_protocols; 478 matching_tm_protocols = ddev->protocols & tm_protocols; 479 480 if (!matching_im_protocols && !matching_tm_protocols) { 481 pr_err("Unknown protocol\n"); 482 return -EINVAL; 483 } 484 485 if (ddev->poll_tech_count) { 486 pr_err("Already polling\n"); 487 return -EBUSY; 488 } 489 490 if (ddev->curr_protocol) { 491 pr_err("A target is already active\n"); 492 return -EBUSY; 493 } 494 495 ddev->poll_tech_count = 0; 496 ddev->poll_tech_index = 0; 497 498 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH) 499 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, 500 digital_in_send_sens_req); 501 502 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH) 503 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B, 504 digital_in_send_sensb_req); 505 506 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) { 507 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, 508 digital_in_send_sensf_req); 509 510 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, 511 digital_in_send_sensf_req); 512 } 513 514 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH) 515 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693, 516 digital_in_send_iso15693_inv_req); 517 518 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) { 519 if (ddev->ops->tg_listen_mdaa) { 520 digital_add_poll_tech(ddev, 0, 521 digital_tg_listen_mdaa); 522 } else if (ddev->ops->tg_listen_md) { 523 digital_add_poll_tech(ddev, 0, 524 digital_tg_listen_md); 525 } else { 526 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, 527 digital_tg_listen_nfca); 528 529 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, 530 digital_tg_listen_nfcf); 531 532 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, 533 digital_tg_listen_nfcf); 534 } 535 } 536 537 if (!ddev->poll_tech_count) { 538 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n", 539 matching_im_protocols, matching_tm_protocols); 540 return -EINVAL; 541 } 542 543 schedule_delayed_work(&ddev->poll_work, 0); 544 545 return 0; 546 } 547 548 static void digital_stop_poll(struct nfc_dev *nfc_dev) 549 { 550 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 551 552 mutex_lock(&ddev->poll_lock); 553 554 if (!ddev->poll_tech_count) { 555 pr_err("Polling operation was not running\n"); 556 mutex_unlock(&ddev->poll_lock); 557 return; 558 } 559 560 ddev->poll_tech_count = 0; 561 562 mutex_unlock(&ddev->poll_lock); 563 564 cancel_delayed_work_sync(&ddev->poll_work); 565 566 digital_abort_cmd(ddev); 567 } 568 569 static int digital_dev_up(struct nfc_dev *nfc_dev) 570 { 571 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 572 573 digital_switch_rf(ddev, 1); 574 575 return 0; 576 } 577 578 static int digital_dev_down(struct nfc_dev *nfc_dev) 579 { 580 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 581 582 digital_switch_rf(ddev, 0); 583 584 return 0; 585 } 586 587 static int digital_dep_link_up(struct nfc_dev *nfc_dev, 588 struct nfc_target *target, 589 __u8 comm_mode, __u8 *gb, size_t gb_len) 590 { 591 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 592 int rc; 593 594 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len); 595 596 if (!rc) 597 ddev->curr_protocol = NFC_PROTO_NFC_DEP; 598 599 return rc; 600 } 601 602 static int digital_dep_link_down(struct nfc_dev *nfc_dev) 603 { 604 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 605 606 digital_abort_cmd(ddev); 607 608 ddev->curr_protocol = 0; 609 610 return 0; 611 } 612 613 static int digital_activate_target(struct nfc_dev *nfc_dev, 614 struct nfc_target *target, __u32 protocol) 615 { 616 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 617 618 if (ddev->poll_tech_count) { 619 pr_err("Can't activate a target while polling\n"); 620 return -EBUSY; 621 } 622 623 if (ddev->curr_protocol) { 624 pr_err("A target is already active\n"); 625 return -EBUSY; 626 } 627 628 ddev->curr_protocol = protocol; 629 630 return 0; 631 } 632 633 static void digital_deactivate_target(struct nfc_dev *nfc_dev, 634 struct nfc_target *target, 635 u8 mode) 636 { 637 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 638 639 if (!ddev->curr_protocol) { 640 pr_err("No active target\n"); 641 return; 642 } 643 644 digital_abort_cmd(ddev); 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(*data_exch), GFP_KERNEL); 702 if (!data_exch) 703 return -ENOMEM; 704 705 data_exch->cb = cb; 706 data_exch->cb_context = cb_context; 707 708 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) { 709 rc = digital_in_send_dep_req(ddev, target, skb, data_exch); 710 goto exit; 711 } 712 713 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || 714 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { 715 rc = digital_in_iso_dep_push_sod(ddev, skb); 716 if (rc) 717 goto exit; 718 } 719 720 ddev->skb_add_crc(skb); 721 722 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete, 723 data_exch); 724 725 exit: 726 if (rc) 727 kfree(data_exch); 728 729 return rc; 730 } 731 732 static struct nfc_ops digital_nfc_ops = { 733 .dev_up = digital_dev_up, 734 .dev_down = digital_dev_down, 735 .start_poll = digital_start_poll, 736 .stop_poll = digital_stop_poll, 737 .dep_link_up = digital_dep_link_up, 738 .dep_link_down = digital_dep_link_down, 739 .activate_target = digital_activate_target, 740 .deactivate_target = digital_deactivate_target, 741 .tm_send = digital_tg_send, 742 .im_transceive = digital_in_send, 743 }; 744 745 struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops, 746 __u32 supported_protocols, 747 __u32 driver_capabilities, 748 int tx_headroom, int tx_tailroom) 749 { 750 struct nfc_digital_dev *ddev; 751 752 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen || 753 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd || 754 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech)) 755 return NULL; 756 757 ddev = kzalloc(sizeof(*ddev), GFP_KERNEL); 758 if (!ddev) 759 return NULL; 760 761 ddev->driver_capabilities = driver_capabilities; 762 ddev->ops = ops; 763 764 mutex_init(&ddev->cmd_lock); 765 INIT_LIST_HEAD(&ddev->cmd_queue); 766 767 INIT_WORK(&ddev->cmd_work, digital_wq_cmd); 768 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete); 769 770 mutex_init(&ddev->poll_lock); 771 INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll); 772 773 if (supported_protocols & NFC_PROTO_JEWEL_MASK) 774 ddev->protocols |= NFC_PROTO_JEWEL_MASK; 775 if (supported_protocols & NFC_PROTO_MIFARE_MASK) 776 ddev->protocols |= NFC_PROTO_MIFARE_MASK; 777 if (supported_protocols & NFC_PROTO_FELICA_MASK) 778 ddev->protocols |= NFC_PROTO_FELICA_MASK; 779 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) 780 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; 781 if (supported_protocols & NFC_PROTO_ISO15693_MASK) 782 ddev->protocols |= NFC_PROTO_ISO15693_MASK; 783 if (supported_protocols & NFC_PROTO_ISO14443_MASK) 784 ddev->protocols |= NFC_PROTO_ISO14443_MASK; 785 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK) 786 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK; 787 788 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; 789 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; 790 791 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols, 792 ddev->tx_headroom, 793 ddev->tx_tailroom); 794 if (!ddev->nfc_dev) { 795 pr_err("nfc_allocate_device failed\n"); 796 goto free_dev; 797 } 798 799 nfc_set_drvdata(ddev->nfc_dev, ddev); 800 801 return ddev; 802 803 free_dev: 804 kfree(ddev); 805 806 return NULL; 807 } 808 EXPORT_SYMBOL(nfc_digital_allocate_device); 809 810 void nfc_digital_free_device(struct nfc_digital_dev *ddev) 811 { 812 nfc_free_device(ddev->nfc_dev); 813 kfree(ddev); 814 } 815 EXPORT_SYMBOL(nfc_digital_free_device); 816 817 int nfc_digital_register_device(struct nfc_digital_dev *ddev) 818 { 819 return nfc_register_device(ddev->nfc_dev); 820 } 821 EXPORT_SYMBOL(nfc_digital_register_device); 822 823 void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) 824 { 825 struct digital_cmd *cmd, *n; 826 827 nfc_unregister_device(ddev->nfc_dev); 828 829 mutex_lock(&ddev->poll_lock); 830 ddev->poll_tech_count = 0; 831 mutex_unlock(&ddev->poll_lock); 832 833 cancel_delayed_work_sync(&ddev->poll_work); 834 cancel_work_sync(&ddev->cmd_work); 835 cancel_work_sync(&ddev->cmd_complete_work); 836 837 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { 838 list_del(&cmd->queue); 839 840 /* Call the command callback if any and pass it a ENODEV error. 841 * This gives a chance to the command issuer to free any 842 * allocated buffer. 843 */ 844 if (cmd->cmd_cb) 845 cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV)); 846 847 kfree(cmd->mdaa_params); 848 kfree(cmd); 849 } 850 } 851 EXPORT_SYMBOL(nfc_digital_unregister_device); 852 853 MODULE_LICENSE("GPL"); 854