linux/net/nfc/digital_core.c
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   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
  27struct 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
  42struct 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
  55void 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
  72int 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
 100static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
 101{
 102        ddev->ops->switch_rf(ddev, on);
 103}
 104
 105static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
 106{
 107        ddev->ops->abort_cmd(ddev);
 108}
 109
 110static 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
 142static 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
 152static 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
 227int 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
 255int 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
 266int 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
 277static 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
 298static 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
 304int 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
 400void 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
 422static 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
 445static 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 * digital_start_poll - 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 */
 471static 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
 551static 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
 572static 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
 581static 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
 590static 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
 605static 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
 616static 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
 636static 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
 651static 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
 658static 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
 685done:
 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
 696static 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
 728exit:
 729        if (rc)
 730                kfree(data_exch);
 731
 732        return rc;
 733}
 734
 735static 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
 748struct 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
 806free_dev:
 807        kfree(ddev);
 808
 809        return NULL;
 810}
 811EXPORT_SYMBOL(nfc_digital_allocate_device);
 812
 813void nfc_digital_free_device(struct nfc_digital_dev *ddev)
 814{
 815        nfc_free_device(ddev->nfc_dev);
 816        kfree(ddev);
 817}
 818EXPORT_SYMBOL(nfc_digital_free_device);
 819
 820int nfc_digital_register_device(struct nfc_digital_dev *ddev)
 821{
 822        return nfc_register_device(ddev->nfc_dev);
 823}
 824EXPORT_SYMBOL(nfc_digital_register_device);
 825
 826void 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}
 854EXPORT_SYMBOL(nfc_digital_unregister_device);
 855
 856MODULE_LICENSE("GPL");
 857