net/nfc/digital_core.c

   1 /*
   2  * NFC Digital Protocol stack
   3  * Copyright (c) 2013, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  */
  15
  16 #define pr_fmt(fmt) "digital: %s: " fmt, __func__
  17
  18 #include <linux/module.h>
  19
  20 #include "digital.h"
  21
  22 #define DIGITAL_PROTO_NFCA_RF_TECH \
  23         (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \
  24         NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK)
  25
  26 #define DIGITAL_PROTO_NFCB_RF_TECH      NFC_PROTO_ISO14443_B_MASK
  27
  28 #define DIGITAL_PROTO_NFCF_RF_TECH \
  29         (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
  30
  31 #define DIGITAL_PROTO_ISO15693_RF_TECH  NFC_PROTO_ISO15693_MASK
  32
  33 /* Delay between each poll frame (ms) */
  34 #define DIGITAL_POLL_INTERVAL 10
  35
  36 struct digital_cmd {
  37         struct list_head queue;
  38
  39         u8 type;
  40         u8 pending;
  41
  42         u16 timeout;
  43         struct sk_buff *req;
  44         struct sk_buff *resp;
  45         struct digital_tg_mdaa_params *mdaa_params;
  46
  47         nfc_digital_cmd_complete_t cmd_cb;
  48         void *cb_context;
  49 };
  50
  51 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
  52                                   unsigned int len)
  53 {
  54         struct sk_buff *skb;
  55
  56         skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
  57                         GFP_KERNEL);
  58         if (skb)
  59                 skb_reserve(skb, ddev->tx_headroom);
  60
  61         return skb;
  62 }
  63
  64 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
  65                          u8 bitwise_inv, u8 msb_first)
  66 {
  67         u16 crc;
  68
  69         crc = crc_func(init, skb->data, skb->len);
  70
  71         if (bitwise_inv)
  72                 crc = ~crc;
  73
  74         if (msb_first)
  75                 crc = __fswab16(crc);
  76
  77         *skb_put(skb, 1) = crc & 0xFF;
  78         *skb_put(skb, 1) = (crc >> 8) & 0xFF;
  79 }
  80
  81 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
  82                           u16 crc_init, u8 bitwise_inv, u8 msb_first)
  83 {
  84         int rc;
  85         u16 crc;
  86
  87         if (skb->len <= 2)
  88                 return -EIO;
  89
  90         crc = crc_func(crc_init, skb->data, skb->len - 2);
  91
  92         if (bitwise_inv)
  93                 crc = ~crc;
  94
  95         if (msb_first)
  96                 crc = __swab16(crc);
  97
  98         rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
  99              (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
 100
 101         if (rc)
 102                 return -EIO;
 103
 104         skb_trim(skb, skb->len - 2);
 105
 106         return 0;
 107 }
 108
 109 static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
 110 {
 111         ddev->ops->switch_rf(ddev, on);
 112 }
 113
 114 static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
 115 {
 116         ddev->ops->abort_cmd(ddev);
 117 }
 118
 119 static void digital_wq_cmd_complete(struct work_struct *work)
 120 {
 121         struct digital_cmd *cmd;
 122         struct nfc_digital_dev *ddev = container_of(work,
 123                                                     struct nfc_digital_dev,
 124                                                     cmd_complete_work);
 125
 126         mutex_lock(&ddev->cmd_lock);
 127
 128         cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
 129                                        queue);
 130         if (!cmd) {
 131                 mutex_unlock(&ddev->cmd_lock);
 132                 return;
 133         }
 134
 135         list_del(&cmd->queue);
 136
 137         mutex_unlock(&ddev->cmd_lock);
 138
 139         if (!IS_ERR(cmd->resp))
 140                 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
 141                                      cmd->resp->data, cmd->resp->len, false);
 142
 143         cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
 144
 145         kfree(cmd->mdaa_params);
 146         kfree(cmd);
 147
 148         schedule_work(&ddev->cmd_work);
 149 }
 150
 151 static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
 152                                       void *arg, struct sk_buff *resp)
 153 {
 154         struct digital_cmd *cmd = arg;
 155
 156         cmd->resp = resp;
 157
 158         schedule_work(&ddev->cmd_complete_work);
 159 }
 160
 161 static void digital_wq_cmd(struct work_struct *work)
 162 {
 163         int rc;
 164         struct digital_cmd *cmd;
 165         struct digital_tg_mdaa_params *params;
 166         struct nfc_digital_dev *ddev = container_of(work,
 167                                                     struct nfc_digital_dev,
 168                                                     cmd_work);
 169
 170         mutex_lock(&ddev->cmd_lock);
 171
 172         cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
 173                                        queue);
 174         if (!cmd || cmd->pending) {
 175                 mutex_unlock(&ddev->cmd_lock);
 176                 return;
 177         }
 178
 179         cmd->pending = 1;
 180
 181         mutex_unlock(&ddev->cmd_lock);
 182
 183         if (cmd->req)
 184                 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
 185                                      cmd->req->data, cmd->req->len, false);
 186
 187         switch (cmd->type) {
 188         case DIGITAL_CMD_IN_SEND:
 189                 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
 190                                             digital_send_cmd_complete, cmd);
 191                 break;
 192
 193         case DIGITAL_CMD_TG_SEND:
 194                 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
 195                                             digital_send_cmd_complete, cmd);
 196                 break;
 197
 198         case DIGITAL_CMD_TG_LISTEN:
 199                 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
 200                                           digital_send_cmd_complete, cmd);
 201                 break;
 202
 203         case DIGITAL_CMD_TG_LISTEN_MDAA:
 204                 params = cmd->mdaa_params;
 205
 206                 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
 207                                                digital_send_cmd_complete, cmd);
 208                 break;
 209
 210         case DIGITAL_CMD_TG_LISTEN_MD:
 211                 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
 212                                                digital_send_cmd_complete, cmd);
 213                 break;
 214
 215         default:
 216                 pr_err("Unknown cmd type %d\n", cmd->type);
 217                 return;
 218         }
 219
 220         if (!rc)
 221                 return;
 222
 223         pr_err("in_send_command returned err %d\n", rc);
 224
 225         mutex_lock(&ddev->cmd_lock);
 226         list_del(&cmd->queue);
 227         mutex_unlock(&ddev->cmd_lock);
 228
 229         kfree_skb(cmd->req);
 230         kfree(cmd->mdaa_params);
 231         kfree(cmd);
 232
 233         schedule_work(&ddev->cmd_work);
 234 }
 235
 236 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
 237                      struct sk_buff *skb, struct digital_tg_mdaa_params *params,
 238                      u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
 239                      void *cb_context)
 240 {
 241         struct digital_cmd *cmd;
 242
 243         cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
 244         if (!cmd)
 245                 return -ENOMEM;
 246
 247         cmd->type = cmd_type;
 248         cmd->timeout = timeout;
 249         cmd->req = skb;
 250         cmd->mdaa_params = params;
 251         cmd->cmd_cb = cmd_cb;
 252         cmd->cb_context = cb_context;
 253         INIT_LIST_HEAD(&cmd->queue);
 254
 255         mutex_lock(&ddev->cmd_lock);
 256         list_add_tail(&cmd->queue, &ddev->cmd_queue);
 257         mutex_unlock(&ddev->cmd_lock);
 258
 259         schedule_work(&ddev->cmd_work);
 260
 261         return 0;
 262 }
 263
 264 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
 265 {
 266         int rc;
 267
 268         rc = ddev->ops->in_configure_hw(ddev, type, param);
 269         if (rc)
 270                 pr_err("in_configure_hw failed: %d\n", rc);
 271
 272         return rc;
 273 }
 274
 275 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
 276 {
 277         int rc;
 278
 279         rc = ddev->ops->tg_configure_hw(ddev, type, param);
 280         if (rc)
 281                 pr_err("tg_configure_hw failed: %d\n", rc);
 282
 283         return rc;
 284 }
 285
 286 static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
 287 {
 288         struct digital_tg_mdaa_params *params;
 289
 290         params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
 291         if (!params)
 292                 return -ENOMEM;
 293
 294         params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
 295         get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
 296         params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
 297
 298         params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
 299         params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
 300         get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
 301         params->sc = DIGITAL_SENSF_FELICA_SC;
 302
 303         return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
 304                                 500, digital_tg_recv_atr_req, NULL);
 305 }
 306
 307 static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
 308 {
 309         return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
 310                                 digital_tg_recv_md_req, NULL);
 311 }
 312
 313 int digital_target_found(struct nfc_digital_dev *ddev,
 314                          struct nfc_target *target, u8 protocol)
 315 {
 316         int rc;
 317         u8 framing;
 318         u8 rf_tech;
 319         u8 poll_tech_count;
 320         int (*check_crc)(struct sk_buff *skb);
 321         void (*add_crc)(struct sk_buff *skb);
 322
 323         rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
 324
 325         switch (protocol) {
 326         case NFC_PROTO_JEWEL:
 327                 framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
 328                 check_crc = digital_skb_check_crc_b;
 329                 add_crc = digital_skb_add_crc_b;
 330                 break;
 331
 332         case NFC_PROTO_MIFARE:
 333                 framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
 334                 check_crc = digital_skb_check_crc_a;
 335                 add_crc = digital_skb_add_crc_a;
 336                 break;
 337
 338         case NFC_PROTO_FELICA:
 339                 framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
 340                 check_crc = digital_skb_check_crc_f;
 341                 add_crc = digital_skb_add_crc_f;
 342                 break;
 343
 344         case NFC_PROTO_NFC_DEP:
 345                 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
 346                         framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
 347                         check_crc = digital_skb_check_crc_a;
 348                         add_crc = digital_skb_add_crc_a;
 349                 } else {
 350                         framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
 351                         check_crc = digital_skb_check_crc_f;
 352                         add_crc = digital_skb_add_crc_f;
 353                 }
 354                 break;
 355
 356         case NFC_PROTO_ISO15693:
 357                 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
 358                 check_crc = digital_skb_check_crc_b;
 359                 add_crc = digital_skb_add_crc_b;
 360                 break;
 361
 362         case NFC_PROTO_ISO14443:
 363                 framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
 364                 check_crc = digital_skb_check_crc_a;
 365                 add_crc = digital_skb_add_crc_a;
 366                 break;
 367
 368         case NFC_PROTO_ISO14443_B:
 369                 framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
 370                 check_crc = digital_skb_check_crc_b;
 371                 add_crc = digital_skb_add_crc_b;
 372                 break;
 373
 374         default:
 375                 pr_err("Invalid protocol %d\n", protocol);
 376                 return -EINVAL;
 377         }
 378
 379         pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
 380
 381         ddev->curr_rf_tech = rf_tech;
 382
 383         if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
 384                 ddev->skb_add_crc = digital_skb_add_crc_none;
 385                 ddev->skb_check_crc = digital_skb_check_crc_none;
 386         } else {
 387                 ddev->skb_add_crc = add_crc;
 388                 ddev->skb_check_crc = check_crc;
 389         }
 390
 391         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
 392         if (rc)
 393                 return rc;
 394
 395         target->supported_protocols = (1 << protocol);
 396
 397         poll_tech_count = ddev->poll_tech_count;
 398         ddev->poll_tech_count = 0;
 399
 400         rc = nfc_targets_found(ddev->nfc_dev, target, 1);
 401         if (rc) {
 402                 ddev->poll_tech_count = poll_tech_count;
 403                 return rc;
 404         }
 405
 406         return 0;
 407 }
 408
 409 void digital_poll_next_tech(struct nfc_digital_dev *ddev)
 410 {
 411         u8 rand_mod;
 412
 413         digital_switch_rf(ddev, 0);
 414
 415         mutex_lock(&ddev->poll_lock);
 416
 417         if (!ddev->poll_tech_count) {
 418                 mutex_unlock(&ddev->poll_lock);
 419                 return;
 420         }
 421
 422         get_random_bytes(&rand_mod, sizeof(rand_mod));
 423         ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
 424
 425         mutex_unlock(&ddev->poll_lock);
 426
 427         schedule_delayed_work(&ddev->poll_work,
 428                               msecs_to_jiffies(DIGITAL_POLL_INTERVAL));
 429 }
 430
 431 static void digital_wq_poll(struct work_struct *work)
 432 {
 433         int rc;
 434         struct digital_poll_tech *poll_tech;
 435         struct nfc_digital_dev *ddev = container_of(work,
 436                                                     struct nfc_digital_dev,
 437                                                     poll_work.work);
 438         mutex_lock(&ddev->poll_lock);
 439
 440         if (!ddev->poll_tech_count) {
 441                 mutex_unlock(&ddev->poll_lock);
 442                 return;
 443         }
 444
 445         poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
 446
 447         mutex_unlock(&ddev->poll_lock);
 448
 449         rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
 450         if (rc)
 451                 digital_poll_next_tech(ddev);
 452 }
 453
 454 static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
 455                                   digital_poll_t poll_func)
 456 {
 457         struct digital_poll_tech *poll_tech;
 458
 459         if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
 460                 return;
 461
 462         poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
 463
 464         poll_tech->rf_tech = rf_tech;
 465         poll_tech->poll_func = poll_func;
 466 }
 467
 468 /**
 469  * start_poll operation
 470  *
 471  * For every supported protocol, the corresponding polling function is added
 472  * to the table of polling technologies (ddev->poll_techs[]) using
 473  * digital_add_poll_tech().
 474  * When a polling function fails (by timeout or protocol error) the next one is
 475  * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
 476  */
 477 static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
 478                               __u32 tm_protocols)
 479 {
 480         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 481         u32 matching_im_protocols, matching_tm_protocols;
 482
 483         pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
 484                  tm_protocols, ddev->protocols);
 485
 486         matching_im_protocols = ddev->protocols & im_protocols;
 487         matching_tm_protocols = ddev->protocols & tm_protocols;
 488
 489         if (!matching_im_protocols && !matching_tm_protocols) {
 490                 pr_err("Unknown protocol\n");
 491                 return -EINVAL;
 492         }
 493
 494         if (ddev->poll_tech_count) {
 495                 pr_err("Already polling\n");
 496                 return -EBUSY;
 497         }
 498
 499         if (ddev->curr_protocol) {
 500                 pr_err("A target is already active\n");
 501                 return -EBUSY;
 502         }
 503
 504         ddev->poll_tech_count = 0;
 505         ddev->poll_tech_index = 0;
 506
 507         if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
 508                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
 509                                       digital_in_send_sens_req);
 510
 511         if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
 512                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
 513                                       digital_in_send_sensb_req);
 514
 515         if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
 516                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
 517                                       digital_in_send_sensf_req);
 518
 519                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
 520                                       digital_in_send_sensf_req);
 521         }
 522
 523         if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
 524                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
 525                                       digital_in_send_iso15693_inv_req);
 526
 527         if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
 528                 if (ddev->ops->tg_listen_mdaa) {
 529                         digital_add_poll_tech(ddev, 0,
 530                                               digital_tg_listen_mdaa);
 531                 } else if (ddev->ops->tg_listen_md) {
 532                         digital_add_poll_tech(ddev, 0,
 533                                               digital_tg_listen_md);
 534                 } else {
 535                         digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
 536                                               digital_tg_listen_nfca);
 537
 538                         digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
 539                                               digital_tg_listen_nfcf);
 540
 541                         digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
 542                                               digital_tg_listen_nfcf);
 543                 }
 544         }
 545
 546         if (!ddev->poll_tech_count) {
 547                 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
 548                        matching_im_protocols, matching_tm_protocols);
 549                 return -EINVAL;
 550         }
 551
 552         schedule_delayed_work(&ddev->poll_work, 0);
 553
 554         return 0;
 555 }
 556
 557 static void digital_stop_poll(struct nfc_dev *nfc_dev)
 558 {
 559         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 560
 561         mutex_lock(&ddev->poll_lock);
 562
 563         if (!ddev->poll_tech_count) {
 564                 pr_err("Polling operation was not running\n");
 565                 mutex_unlock(&ddev->poll_lock);
 566                 return;
 567         }
 568
 569         ddev->poll_tech_count = 0;
 570
 571         mutex_unlock(&ddev->poll_lock);
 572
 573         cancel_delayed_work_sync(&ddev->poll_work);
 574
 575         digital_abort_cmd(ddev);
 576 }
 577
 578 static int digital_dev_up(struct nfc_dev *nfc_dev)
 579 {
 580         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 581
 582         digital_switch_rf(ddev, 1);
 583
 584         return 0;
 585 }
 586
 587 static int digital_dev_down(struct nfc_dev *nfc_dev)
 588 {
 589         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 590
 591         digital_switch_rf(ddev, 0);
 592
 593         return 0;
 594 }
 595
 596 static int digital_dep_link_up(struct nfc_dev *nfc_dev,
 597                                struct nfc_target *target,
 598                                __u8 comm_mode, __u8 *gb, size_t gb_len)
 599 {
 600         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 601         int rc;
 602
 603         rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
 604
 605         if (!rc)
 606                 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
 607
 608         return rc;
 609 }
 610
 611 static int digital_dep_link_down(struct nfc_dev *nfc_dev)
 612 {
 613         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 614
 615         digital_abort_cmd(ddev);
 616
 617         ddev->curr_protocol = 0;
 618
 619         return 0;
 620 }
 621
 622 static int digital_activate_target(struct nfc_dev *nfc_dev,
 623                                    struct nfc_target *target, __u32 protocol)
 624 {
 625         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 626
 627         if (ddev->poll_tech_count) {
 628                 pr_err("Can't activate a target while polling\n");
 629                 return -EBUSY;
 630         }
 631
 632         if (ddev->curr_protocol) {
 633                 pr_err("A target is already active\n");
 634                 return -EBUSY;
 635         }
 636
 637         ddev->curr_protocol = protocol;
 638
 639         return 0;
 640 }
 641
 642 static void digital_deactivate_target(struct nfc_dev *nfc_dev,
 643                                       struct nfc_target *target,
 644                                       u8 mode)
 645 {
 646         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 647
 648         if (!ddev->curr_protocol) {
 649                 pr_err("No active target\n");
 650                 return;
 651         }
 652
 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(struct digital_data_exch), GFP_KERNEL);
 710         if (!data_exch) {
 711                 pr_err("Failed to allocate data_exch struct\n");
 712                 return -ENOMEM;
 713         }
 714
 715         data_exch->cb = cb;
 716         data_exch->cb_context = cb_context;
 717
 718         if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
 719                 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
 720                 goto exit;
 721         }
 722
 723         if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
 724             (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
 725                 rc = digital_in_iso_dep_push_sod(ddev, skb);
 726                 if (rc)
 727                         goto exit;
 728         }
 729
 730         ddev->skb_add_crc(skb);
 731
 732         rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
 733                                  data_exch);
 734
 735 exit:
 736         if (rc)
 737                 kfree(data_exch);
 738
 739         return rc;
 740 }
 741
 742 static struct nfc_ops digital_nfc_ops = {
 743         .dev_up = digital_dev_up,
 744         .dev_down = digital_dev_down,
 745         .start_poll = digital_start_poll,
 746         .stop_poll = digital_stop_poll,
 747         .dep_link_up = digital_dep_link_up,
 748         .dep_link_down = digital_dep_link_down,
 749         .activate_target = digital_activate_target,
 750         .deactivate_target = digital_deactivate_target,
 751         .tm_send = digital_tg_send,
 752         .im_transceive = digital_in_send,
 753 };
 754
 755 struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
 756                                             __u32 supported_protocols,
 757                                             __u32 driver_capabilities,
 758                                             int tx_headroom, int tx_tailroom)
 759 {
 760         struct nfc_digital_dev *ddev;
 761
 762         if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
 763             !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
 764             !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
 765                 return NULL;
 766
 767         ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
 768         if (!ddev)
 769                 return NULL;
 770
 771         ddev->driver_capabilities = driver_capabilities;
 772         ddev->ops = ops;
 773
 774         mutex_init(&ddev->cmd_lock);
 775         INIT_LIST_HEAD(&ddev->cmd_queue);
 776
 777         INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
 778         INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
 779
 780         mutex_init(&ddev->poll_lock);
 781         INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll);
 782
 783         if (supported_protocols & NFC_PROTO_JEWEL_MASK)
 784                 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
 785         if (supported_protocols & NFC_PROTO_MIFARE_MASK)
 786                 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
 787         if (supported_protocols & NFC_PROTO_FELICA_MASK)
 788                 ddev->protocols |= NFC_PROTO_FELICA_MASK;
 789         if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
 790                 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
 791         if (supported_protocols & NFC_PROTO_ISO15693_MASK)
 792                 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
 793         if (supported_protocols & NFC_PROTO_ISO14443_MASK)
 794                 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
 795         if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
 796                 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
 797
 798         ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
 799         ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
 800
 801         ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
 802                                             ddev->tx_headroom,
 803                                             ddev->tx_tailroom);
 804         if (!ddev->nfc_dev) {
 805                 pr_err("nfc_allocate_device failed\n");
 806                 goto free_dev;
 807         }
 808
 809         nfc_set_drvdata(ddev->nfc_dev, ddev);
 810
 811         return ddev;
 812
 813 free_dev:
 814         kfree(ddev);
 815
 816         return NULL;
 817 }
 818 EXPORT_SYMBOL(nfc_digital_allocate_device);
 819
 820 void nfc_digital_free_device(struct nfc_digital_dev *ddev)
 821 {
 822         nfc_free_device(ddev->nfc_dev);
 823         kfree(ddev);
 824 }
 825 EXPORT_SYMBOL(nfc_digital_free_device);
 826
 827 int nfc_digital_register_device(struct nfc_digital_dev *ddev)
 828 {
 829         return nfc_register_device(ddev->nfc_dev);
 830 }
 831 EXPORT_SYMBOL(nfc_digital_register_device);
 832
 833 void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
 834 {
 835         struct digital_cmd *cmd, *n;
 836
 837         nfc_unregister_device(ddev->nfc_dev);
 838
 839         mutex_lock(&ddev->poll_lock);
 840         ddev->poll_tech_count = 0;
 841         mutex_unlock(&ddev->poll_lock);
 842
 843         cancel_delayed_work_sync(&ddev->poll_work);
 844         cancel_work_sync(&ddev->cmd_work);
 845         cancel_work_sync(&ddev->cmd_complete_work);
 846
 847         list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
 848                 list_del(&cmd->queue);
 849
 850                 /* Call the command callback if any and pass it a ENODEV error.
 851                  * This gives a chance to the command issuer to free any
 852                  * allocated buffer.
 853                  */
 854                 if (cmd->cmd_cb)
 855                         cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV));
 856
 857                 kfree(cmd->mdaa_params);
 858                 kfree(cmd);
 859         }
 860 }
 861 EXPORT_SYMBOL(nfc_digital_unregister_device);
 862
 863 MODULE_LICENSE("GPL");