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 * @nfc_dev: device to be polled 462 * @im_protocols: bitset of nfc initiator protocols to be used for polling 463 * @tm_protocols: bitset of nfc transport protocols to be used for polling 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_delayed_work(&ddev->poll_work, 0); 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_delayed_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 digital_abort_cmd(ddev); 610 611 ddev->curr_protocol = 0; 612 613 return 0; 614 } 615 616 static int digital_activate_target(struct nfc_dev *nfc_dev, 617 struct nfc_target *target, __u32 protocol) 618 { 619 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 620 621 if (ddev->poll_tech_count) { 622 pr_err("Can't activate a target while polling\n"); 623 return -EBUSY; 624 } 625 626 if (ddev->curr_protocol) { 627 pr_err("A target is already active\n"); 628 return -EBUSY; 629 } 630 631 ddev->curr_protocol = protocol; 632 633 return 0; 634 } 635 636 static void digital_deactivate_target(struct nfc_dev *nfc_dev, 637 struct nfc_target *target, 638 u8 mode) 639 { 640 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 641 642 if (!ddev->curr_protocol) { 643 pr_err("No active target\n"); 644 return; 645 } 646 647 digital_abort_cmd(ddev); 648 ddev->curr_protocol = 0; 649 } 650 651 static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb) 652 { 653 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev); 654 655 return digital_tg_send_dep_res(ddev, skb); 656 } 657 658 static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg, 659 struct sk_buff *resp) 660 { 661 struct digital_data_exch *data_exch = arg; 662 int rc; 663 664 if (IS_ERR(resp)) { 665 rc = PTR_ERR(resp); 666 resp = NULL; 667 goto done; 668 } 669 670 if (ddev->curr_protocol == NFC_PROTO_MIFARE) { 671 rc = digital_in_recv_mifare_res(resp); 672 /* crc check is done in digital_in_recv_mifare_res() */ 673 goto done; 674 } 675 676 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || 677 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { 678 rc = digital_in_iso_dep_pull_sod(ddev, resp); 679 if (rc) 680 goto done; 681 } 682 683 rc = ddev->skb_check_crc(resp); 684 685 done: 686 if (rc) { 687 kfree_skb(resp); 688 resp = NULL; 689 } 690 691 data_exch->cb(data_exch->cb_context, resp, rc); 692 693 kfree(data_exch); 694 } 695 696 static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target, 697 struct sk_buff *skb, data_exchange_cb_t cb, 698 void *cb_context) 699 { 700 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); 701 struct digital_data_exch *data_exch; 702 int rc; 703 704 data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL); 705 if (!data_exch) 706 return -ENOMEM; 707 708 data_exch->cb = cb; 709 data_exch->cb_context = cb_context; 710 711 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) { 712 rc = digital_in_send_dep_req(ddev, target, skb, data_exch); 713 goto exit; 714 } 715 716 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || 717 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { 718 rc = digital_in_iso_dep_push_sod(ddev, skb); 719 if (rc) 720 goto exit; 721 } 722 723 ddev->skb_add_crc(skb); 724 725 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete, 726 data_exch); 727 728 exit: 729 if (rc) 730 kfree(data_exch); 731 732 return rc; 733 } 734 735 static struct nfc_ops digital_nfc_ops = { 736 .dev_up = digital_dev_up, 737 .dev_down = digital_dev_down, 738 .start_poll = digital_start_poll, 739 .stop_poll = digital_stop_poll, 740 .dep_link_up = digital_dep_link_up, 741 .dep_link_down = digital_dep_link_down, 742 .activate_target = digital_activate_target, 743 .deactivate_target = digital_deactivate_target, 744 .tm_send = digital_tg_send, 745 .im_transceive = digital_in_send, 746 }; 747 748 struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops, 749 __u32 supported_protocols, 750 __u32 driver_capabilities, 751 int tx_headroom, int tx_tailroom) 752 { 753 struct nfc_digital_dev *ddev; 754 755 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen || 756 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd || 757 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech)) 758 return NULL; 759 760 ddev = kzalloc(sizeof(*ddev), GFP_KERNEL); 761 if (!ddev) 762 return NULL; 763 764 ddev->driver_capabilities = driver_capabilities; 765 ddev->ops = ops; 766 767 mutex_init(&ddev->cmd_lock); 768 INIT_LIST_HEAD(&ddev->cmd_queue); 769 770 INIT_WORK(&ddev->cmd_work, digital_wq_cmd); 771 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete); 772 773 mutex_init(&ddev->poll_lock); 774 INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll); 775 776 if (supported_protocols & NFC_PROTO_JEWEL_MASK) 777 ddev->protocols |= NFC_PROTO_JEWEL_MASK; 778 if (supported_protocols & NFC_PROTO_MIFARE_MASK) 779 ddev->protocols |= NFC_PROTO_MIFARE_MASK; 780 if (supported_protocols & NFC_PROTO_FELICA_MASK) 781 ddev->protocols |= NFC_PROTO_FELICA_MASK; 782 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) 783 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; 784 if (supported_protocols & NFC_PROTO_ISO15693_MASK) 785 ddev->protocols |= NFC_PROTO_ISO15693_MASK; 786 if (supported_protocols & NFC_PROTO_ISO14443_MASK) 787 ddev->protocols |= NFC_PROTO_ISO14443_MASK; 788 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK) 789 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK; 790 791 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; 792 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; 793 794 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols, 795 ddev->tx_headroom, 796 ddev->tx_tailroom); 797 if (!ddev->nfc_dev) { 798 pr_err("nfc_allocate_device failed\n"); 799 goto free_dev; 800 } 801 802 nfc_set_drvdata(ddev->nfc_dev, ddev); 803 804 return ddev; 805 806 free_dev: 807 kfree(ddev); 808 809 return NULL; 810 } 811 EXPORT_SYMBOL(nfc_digital_allocate_device); 812 813 void nfc_digital_free_device(struct nfc_digital_dev *ddev) 814 { 815 nfc_free_device(ddev->nfc_dev); 816 kfree(ddev); 817 } 818 EXPORT_SYMBOL(nfc_digital_free_device); 819 820 int nfc_digital_register_device(struct nfc_digital_dev *ddev) 821 { 822 return nfc_register_device(ddev->nfc_dev); 823 } 824 EXPORT_SYMBOL(nfc_digital_register_device); 825 826 void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) 827 { 828 struct digital_cmd *cmd, *n; 829 830 nfc_unregister_device(ddev->nfc_dev); 831 832 mutex_lock(&ddev->poll_lock); 833 ddev->poll_tech_count = 0; 834 mutex_unlock(&ddev->poll_lock); 835 836 cancel_delayed_work_sync(&ddev->poll_work); 837 cancel_work_sync(&ddev->cmd_work); 838 cancel_work_sync(&ddev->cmd_complete_work); 839 840 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { 841 list_del(&cmd->queue); 842 843 /* Call the command callback if any and pass it a ENODEV error. 844 * This gives a chance to the command issuer to free any 845 * allocated buffer. 846 */ 847 if (cmd->cmd_cb) 848 cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV)); 849 850 kfree(cmd->mdaa_params); 851 kfree(cmd); 852 } 853 } 854 EXPORT_SYMBOL(nfc_digital_unregister_device); 855 856 MODULE_LICENSE("GPL"); 857