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 int rc; 281 282 params = kzalloc(sizeof(*params), GFP_KERNEL); 283 if (!params) 284 return -ENOMEM; 285 286 params->sens_res = DIGITAL_SENS_RES_NFC_DEP; 287 get_random_bytes(params->nfcid1, sizeof(params->nfcid1)); 288 params->sel_res = DIGITAL_SEL_RES_NFC_DEP; 289 290 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; 291 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; 292 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); 293 params->sc = DIGITAL_SENSF_FELICA_SC; 294 295 rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, 296 500, digital_tg_recv_atr_req, NULL); 297 if (rc) 298 kfree(params); 299 300 return rc; 301 } 302 303 static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech) 304 { 305 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500, 306 digital_tg_recv_md_req, NULL); 307 } 308 309 int digital_target_found(struct nfc_digital_dev *ddev, 310 struct nfc_target *target, u8 protocol) 311 { 312 int rc; 313 u8 framing; 314 u8 rf_tech; 315 u8 poll_tech_count; 316 int (*check_crc)(struct sk_buff *skb); 317 void (*add_crc)(struct sk_buff *skb); 318 319 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech; 320 321 switch (protocol) { 322 case NFC_PROTO_JEWEL: 323 framing = NFC_DIGITAL_FRAMING_NFCA_T1T; 324 check_crc = digital_skb_check_crc_b; 325 add_crc = digital_skb_add_crc_b; 326 break; 327 328 case NFC_PROTO_MIFARE: 329 framing = NFC_DIGITAL_FRAMING_NFCA_T2T; 330 check_crc = digital_skb_check_crc_a; 331 add_crc = digital_skb_add_crc_a; 332 break; 333 334 case NFC_PROTO_FELICA: 335 framing = NFC_DIGITAL_FRAMING_NFCF_T3T; 336 check_crc = digital_skb_check_crc_f; 337 add_crc = digital_skb_add_crc_f; 338 break; 339 340 case NFC_PROTO_NFC_DEP: 341 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) { 342 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP; 343 check_crc = digital_skb_check_crc_a; 344 add_crc = digital_skb_add_crc_a; 345 } else { 346 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP; 347 check_crc = digital_skb_check_crc_f; 348 add_crc = digital_skb_add_crc_f; 349 } 350 break; 351 352 case NFC_PROTO_ISO15693: 353 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T; 354 check_crc = digital_skb_check_crc_b; 355 add_crc = digital_skb_add_crc_b; 356 break; 357 358 case NFC_PROTO_ISO14443: 359 framing = NFC_DIGITAL_FRAMING_NFCA_T4T; 360 check_crc = digital_skb_check_crc_a; 361 add_crc = digital_skb_add_crc_a; 362 break; 363 364 case NFC_PROTO_ISO14443_B: 365 framing = NFC_DIGITAL_FRAMING_NFCB_T4T; 366 check_crc = digital_skb_check_crc_b; 367 add_crc = digital_skb_add_crc_b; 368 break; 369 370 default: 371 pr_err("Invalid protocol %d\n", protocol); 372 return -EINVAL; 373 } 374 375 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol); 376 377 ddev->curr_rf_tech = rf_tech; 378 379 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { 380 ddev->skb_add_crc = digital_skb_add_crc_none; 381 ddev->skb_check_crc = digital_skb_check_crc_none; 382 } else { 383 ddev->skb_add_crc = add_crc; 384 ddev->skb_check_crc = check_crc; 385 } 386 387 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing); 388 if (rc) 389 return rc; 390 391 target->supported_protocols = (1 << protocol); 392 393 poll_tech_count = ddev->poll_tech_count; 394 ddev->poll_tech_count = 0; 395 396 rc = nfc_targets_found(ddev->nfc_dev, target, 1); 397 if (rc) { 398 ddev->poll_tech_count = poll_tech_count; 399 return rc; 400 } 401 402 return 0; 403 } 404 405 void digital_poll_next_tech(struct nfc_digital_dev *ddev) 406 { 407 u8 rand_mod; 408 409 digital_switch_rf(ddev, 0); 410 411 mutex_lock(&ddev->poll_lock); 412 413 if (!ddev->poll_tech_count) { 414 mutex_unlock(&ddev->poll_lock); 415 return; 416 } 417 418 get_random_bytes(&rand_mod, sizeof(rand_mod)); 419 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count; 420 421 mutex_unlock(&ddev->poll_lock); 422 423 schedule_delayed_work(&ddev->poll_work, 424 msecs_to_jiffies(DIGITAL_POLL_INTERVAL)); 425 } 426 427 static void digital_wq_poll(struct work_struct *work) 428 { 429 int rc; 430 struct digital_poll_tech *poll_tech; 431 struct nfc_digital_dev *ddev = container_of(work, 432 struct nfc_digital_dev, 433 poll_work.work); 434 mutex_lock(&ddev->poll_lock); 435 436 if (!ddev->poll_tech_count) { 437 mutex_unlock(&ddev->poll_lock); 438 return; 439 } 440 441 poll_tech = &ddev->poll_techs[ddev->poll_tech_index]; 442 443 mutex_unlock(&ddev->poll_lock); 444 445 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech); 446 if (rc) 447 digital_poll_next_tech(ddev); 448 } 449 450 static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech, 451 digital_poll_t poll_func) 452 { 453 struct digital_poll_tech *poll_tech; 454 455 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX) 456 return; 457 458 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++]; 459 460 poll_tech->rf_tech = rf_tech; 461 poll_tech->poll_func = poll_func; 462 } 463 464 /** 465 * digital_start_poll - start_poll operation 466 * @nfc_dev: device to be polled 467 * @im_protocols: bitset of nfc initiator protocols to be used for polling 468 * @tm_protocols: bitset of nfc transport protocols to be used for polling 469 * 470 * For every supported protocol, the corresponding polling function is added 471 * to the table of polling technologies (ddev->poll_techs[]) using 472 * digital_add_poll_tech(). 473 * When a polling function fails (by timeout or protocol error) the next one is 474 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work). 475 */ 476 static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols, 477 __u32 tm_protocols) 478 { 479 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 480 u32 matching_im_protocols, matching_tm_protocols; 481 482 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols, 483 tm_protocols, ddev->protocols); 484 485 matching_im_protocols = ddev->protocols & im_protocols; 486 matching_tm_protocols = ddev->protocols & tm_protocols; 487 488 if (!matching_im_protocols && !matching_tm_protocols) { 489 pr_err("Unknown protocol\n"); 490 return -EINVAL; 491 } 492 493 if (ddev->poll_tech_count) { 494 pr_err("Already polling\n"); 495 return -EBUSY; 496 } 497 498 if (ddev->curr_protocol) { 499 pr_err("A target is already active\n"); 500 return -EBUSY; 501 } 502 503 ddev->poll_tech_count = 0; 504 ddev->poll_tech_index = 0; 505 506 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH) 507 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, 508 digital_in_send_sens_req); 509 510 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH) 511 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B, 512 digital_in_send_sensb_req); 513 514 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) { 515 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, 516 digital_in_send_sensf_req); 517 518 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, 519 digital_in_send_sensf_req); 520 } 521 522 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH) 523 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693, 524 digital_in_send_iso15693_inv_req); 525 526 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) { 527 if (ddev->ops->tg_listen_mdaa) { 528 digital_add_poll_tech(ddev, 0, 529 digital_tg_listen_mdaa); 530 } else if (ddev->ops->tg_listen_md) { 531 digital_add_poll_tech(ddev, 0, 532 digital_tg_listen_md); 533 } else { 534 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, 535 digital_tg_listen_nfca); 536 537 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, 538 digital_tg_listen_nfcf); 539 540 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, 541 digital_tg_listen_nfcf); 542 } 543 } 544 545 if (!ddev->poll_tech_count) { 546 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n", 547 matching_im_protocols, matching_tm_protocols); 548 return -EINVAL; 549 } 550 551 schedule_delayed_work(&ddev->poll_work, 0); 552 553 return 0; 554 } 555 556 static void digital_stop_poll(struct nfc_dev *nfc_dev) 557 { 558 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 559 560 mutex_lock(&ddev->poll_lock); 561 562 if (!ddev->poll_tech_count) { 563 pr_err("Polling operation was not running\n"); 564 mutex_unlock(&ddev->poll_lock); 565 return; 566 } 567 568 ddev->poll_tech_count = 0; 569 570 mutex_unlock(&ddev->poll_lock); 571 572 cancel_delayed_work_sync(&ddev->poll_work); 573 574 digital_abort_cmd(ddev); 575 } 576 577 static int digital_dev_up(struct nfc_dev *nfc_dev) 578 { 579 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 580 581 digital_switch_rf(ddev, 1); 582 583 return 0; 584 } 585 586 static int digital_dev_down(struct nfc_dev *nfc_dev) 587 { 588 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 589 590 digital_switch_rf(ddev, 0); 591 592 return 0; 593 } 594 595 static int digital_dep_link_up(struct nfc_dev *nfc_dev, 596 struct nfc_target *target, 597 __u8 comm_mode, __u8 *gb, size_t gb_len) 598 { 599 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 600 int rc; 601 602 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len); 603 604 if (!rc) 605 ddev->curr_protocol = NFC_PROTO_NFC_DEP; 606 607 return rc; 608 } 609 610 static int digital_dep_link_down(struct nfc_dev *nfc_dev) 611 { 612 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 613 614 digital_abort_cmd(ddev); 615 616 ddev->curr_protocol = 0; 617 618 return 0; 619 } 620 621 static int digital_activate_target(struct nfc_dev *nfc_dev, 622 struct nfc_target *target, __u32 protocol) 623 { 624 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 625 626 if (ddev->poll_tech_count) { 627 pr_err("Can't activate a target while polling\n"); 628 return -EBUSY; 629 } 630 631 if (ddev->curr_protocol) { 632 pr_err("A target is already active\n"); 633 return -EBUSY; 634 } 635 636 ddev->curr_protocol = protocol; 637 638 return 0; 639 } 640 641 static void digital_deactivate_target(struct nfc_dev *nfc_dev, 642 struct nfc_target *target, 643 u8 mode) 644 { 645 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 646 647 if (!ddev->curr_protocol) { 648 pr_err("No active target\n"); 649 return; 650 } 651 652 digital_abort_cmd(ddev); 653 ddev->curr_protocol = 0; 654 } 655 656 static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb) 657 { 658 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev); 659 660 return digital_tg_send_dep_res(ddev, skb); 661 } 662 663 static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg, 664 struct sk_buff *resp) 665 { 666 struct digital_data_exch *data_exch = arg; 667 int rc; 668 669 if (IS_ERR(resp)) { 670 rc = PTR_ERR(resp); 671 resp = NULL; 672 goto done; 673 } 674 675 if (ddev->curr_protocol == NFC_PROTO_MIFARE) { 676 rc = digital_in_recv_mifare_res(resp); 677 /* crc check is done in digital_in_recv_mifare_res() */ 678 goto done; 679 } 680 681 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || 682 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { 683 rc = digital_in_iso_dep_pull_sod(ddev, resp); 684 if (rc) 685 goto done; 686 } 687 688 rc = ddev->skb_check_crc(resp); 689 690 done: 691 if (rc) { 692 kfree_skb(resp); 693 resp = NULL; 694 } 695 696 data_exch->cb(data_exch->cb_context, resp, rc); 697 698 kfree(data_exch); 699 } 700 701 static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target, 702 struct sk_buff *skb, data_exchange_cb_t cb, 703 void *cb_context) 704 { 705 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 706 struct digital_data_exch *data_exch; 707 int rc; 708 709 data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL); 710 if (!data_exch) 711 return -ENOMEM; 712 713 data_exch->cb = cb; 714 data_exch->cb_context = cb_context; 715 716 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) { 717 rc = digital_in_send_dep_req(ddev, target, skb, data_exch); 718 goto exit; 719 } 720 721 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || 722 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { 723 rc = digital_in_iso_dep_push_sod(ddev, skb); 724 if (rc) 725 goto exit; 726 } 727 728 ddev->skb_add_crc(skb); 729 730 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete, 731 data_exch); 732 733 exit: 734 if (rc) 735 kfree(data_exch); 736 737 return rc; 738 } 739 740 static const struct nfc_ops digital_nfc_ops = { 741 .dev_up = digital_dev_up, 742 .dev_down = digital_dev_down, 743 .start_poll = digital_start_poll, 744 .stop_poll = digital_stop_poll, 745 .dep_link_up = digital_dep_link_up, 746 .dep_link_down = digital_dep_link_down, 747 .activate_target = digital_activate_target, 748 .deactivate_target = digital_deactivate_target, 749 .tm_send = digital_tg_send, 750 .im_transceive = digital_in_send, 751 }; 752 753 struct nfc_digital_dev *nfc_digital_allocate_device(const struct nfc_digital_ops *ops, 754 __u32 supported_protocols, 755 __u32 driver_capabilities, 756 int tx_headroom, int tx_tailroom) 757 { 758 struct nfc_digital_dev *ddev; 759 760 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen || 761 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd || 762 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech)) 763 return NULL; 764 765 ddev = kzalloc(sizeof(*ddev), GFP_KERNEL); 766 if (!ddev) 767 return NULL; 768 769 ddev->driver_capabilities = driver_capabilities; 770 ddev->ops = ops; 771 772 mutex_init(&ddev->cmd_lock); 773 INIT_LIST_HEAD(&ddev->cmd_queue); 774 775 INIT_WORK(&ddev->cmd_work, digital_wq_cmd); 776 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete); 777 778 mutex_init(&ddev->poll_lock); 779 INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll); 780 781 if (supported_protocols & NFC_PROTO_JEWEL_MASK) 782 ddev->protocols |= NFC_PROTO_JEWEL_MASK; 783 if (supported_protocols & NFC_PROTO_MIFARE_MASK) 784 ddev->protocols |= NFC_PROTO_MIFARE_MASK; 785 if (supported_protocols & NFC_PROTO_FELICA_MASK) 786 ddev->protocols |= NFC_PROTO_FELICA_MASK; 787 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) 788 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; 789 if (supported_protocols & NFC_PROTO_ISO15693_MASK) 790 ddev->protocols |= NFC_PROTO_ISO15693_MASK; 791 if (supported_protocols & NFC_PROTO_ISO14443_MASK) 792 ddev->protocols |= NFC_PROTO_ISO14443_MASK; 793 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK) 794 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK; 795 796 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; 797 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; 798 799 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols, 800 ddev->tx_headroom, 801 ddev->tx_tailroom); 802 if (!ddev->nfc_dev) { 803 pr_err("nfc_allocate_device failed\n"); 804 goto free_dev; 805 } 806 807 nfc_set_drvdata(ddev->nfc_dev, ddev); 808 809 return ddev; 810 811 free_dev: 812 kfree(ddev); 813 814 return NULL; 815 } 816 EXPORT_SYMBOL(nfc_digital_allocate_device); 817 818 void nfc_digital_free_device(struct nfc_digital_dev *ddev) 819 { 820 nfc_free_device(ddev->nfc_dev); 821 kfree(ddev); 822 } 823 EXPORT_SYMBOL(nfc_digital_free_device); 824 825 int nfc_digital_register_device(struct nfc_digital_dev *ddev) 826 { 827 return nfc_register_device(ddev->nfc_dev); 828 } 829 EXPORT_SYMBOL(nfc_digital_register_device); 830 831 void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) 832 { 833 struct digital_cmd *cmd, *n; 834 835 nfc_unregister_device(ddev->nfc_dev); 836 837 mutex_lock(&ddev->poll_lock); 838 ddev->poll_tech_count = 0; 839 mutex_unlock(&ddev->poll_lock); 840 841 cancel_delayed_work_sync(&ddev->poll_work); 842 cancel_work_sync(&ddev->cmd_work); 843 cancel_work_sync(&ddev->cmd_complete_work); 844 845 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { 846 list_del(&cmd->queue); 847 848 /* Call the command callback if any and pass it a ENODEV error. 849 * This gives a chance to the command issuer to free any 850 * allocated buffer. 851 */ 852 if (cmd->cmd_cb) 853 cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV)); 854 855 kfree(cmd->mdaa_params); 856 kfree(cmd); 857 } 858 } 859 EXPORT_SYMBOL(nfc_digital_unregister_device); 860 861 MODULE_DESCRIPTION("NFC Digital protocol stack"); 862 MODULE_LICENSE("GPL"); 863