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 | NFC_PROTO_NFC_DEP_MASK)
  24
  25 #define DIGITAL_PROTO_NFCB_RF_TECH      NFC_PROTO_ISO14443_B_MASK
  26
  27 #define DIGITAL_PROTO_NFCF_RF_TECH \
  28         (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
  29
  30 #define DIGITAL_PROTO_ISO15693_RF_TECH  NFC_PROTO_ISO15693_MASK
  31
  32 struct digital_cmd {
  33         struct list_head queue;
  34
  35         u8 type;
  36         u8 pending;
  37
  38         u16 timeout;
  39         struct sk_buff *req;
  40         struct sk_buff *resp;
  41         struct digital_tg_mdaa_params *mdaa_params;
  42
  43         nfc_digital_cmd_complete_t cmd_cb;
  44         void *cb_context;
  45 };
  46
  47 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
  48                                   unsigned int len)
  49 {
  50         struct sk_buff *skb;
  51
  52         skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
  53                         GFP_KERNEL);
  54         if (skb)
  55                 skb_reserve(skb, ddev->tx_headroom);
  56
  57         return skb;
  58 }
  59
  60 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
  61                          u8 bitwise_inv, u8 msb_first)
  62 {
  63         u16 crc;
  64
  65         crc = crc_func(init, skb->data, skb->len);
  66
  67         if (bitwise_inv)
  68                 crc = ~crc;
  69
  70         if (msb_first)
  71                 crc = __fswab16(crc);
  72
  73         *skb_put(skb, 1) = crc & 0xFF;
  74         *skb_put(skb, 1) = (crc >> 8) & 0xFF;
  75 }
  76
  77 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
  78                           u16 crc_init, u8 bitwise_inv, u8 msb_first)
  79 {
  80         int rc;
  81         u16 crc;
  82
  83         if (skb->len <= 2)
  84                 return -EIO;
  85
  86         crc = crc_func(crc_init, skb->data, skb->len - 2);
  87
  88         if (bitwise_inv)
  89                 crc = ~crc;
  90
  91         if (msb_first)
  92                 crc = __swab16(crc);
  93
  94         rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
  95              (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
  96
  97         if (rc)
  98                 return -EIO;
  99
 100         skb_trim(skb, skb->len - 2);
 101
 102         return 0;
 103 }
 104
 105 static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
 106 {
 107         ddev->ops->switch_rf(ddev, on);
 108 }
 109
 110 static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
 111 {
 112         ddev->ops->abort_cmd(ddev);
 113 }
 114
 115 static void digital_wq_cmd_complete(struct work_struct *work)
 116 {
 117         struct digital_cmd *cmd;
 118         struct nfc_digital_dev *ddev = container_of(work,
 119                                                     struct nfc_digital_dev,
 120                                                     cmd_complete_work);
 121
 122         mutex_lock(&ddev->cmd_lock);
 123
 124         cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
 125                                        queue);
 126         if (!cmd) {
 127                 mutex_unlock(&ddev->cmd_lock);
 128                 return;
 129         }
 130
 131         list_del(&cmd->queue);
 132
 133         mutex_unlock(&ddev->cmd_lock);
 134
 135         if (!IS_ERR(cmd->resp))
 136                 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
 137                                      cmd->resp->data, cmd->resp->len, false);
 138
 139         cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
 140
 141         kfree(cmd->mdaa_params);
 142         kfree(cmd);
 143
 144         schedule_work(&ddev->cmd_work);
 145 }
 146
 147 static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
 148                                       void *arg, struct sk_buff *resp)
 149 {
 150         struct digital_cmd *cmd = arg;
 151
 152         cmd->resp = resp;
 153
 154         schedule_work(&ddev->cmd_complete_work);
 155 }
 156
 157 static void digital_wq_cmd(struct work_struct *work)
 158 {
 159         int rc;
 160         struct digital_cmd *cmd;
 161         struct digital_tg_mdaa_params *params;
 162         struct nfc_digital_dev *ddev = container_of(work,
 163                                                     struct nfc_digital_dev,
 164                                                     cmd_work);
 165
 166         mutex_lock(&ddev->cmd_lock);
 167
 168         cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
 169                                        queue);
 170         if (!cmd || cmd->pending) {
 171                 mutex_unlock(&ddev->cmd_lock);
 172                 return;
 173         }
 174
 175         mutex_unlock(&ddev->cmd_lock);
 176
 177         if (cmd->req)
 178                 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
 179                                      cmd->req->data, cmd->req->len, false);
 180
 181         switch (cmd->type) {
 182         case DIGITAL_CMD_IN_SEND:
 183                 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
 184                                             digital_send_cmd_complete, cmd);
 185                 break;
 186
 187         case DIGITAL_CMD_TG_SEND:
 188                 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
 189                                             digital_send_cmd_complete, cmd);
 190                 break;
 191
 192         case DIGITAL_CMD_TG_LISTEN:
 193                 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
 194                                           digital_send_cmd_complete, cmd);
 195                 break;
 196
 197         case DIGITAL_CMD_TG_LISTEN_MDAA:
 198                 params = cmd->mdaa_params;
 199
 200                 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
 201                                                digital_send_cmd_complete, cmd);
 202                 break;
 203
 204         default:
 205                 pr_err("Unknown cmd type %d\n", cmd->type);
 206                 return;
 207         }
 208
 209         if (!rc)
 210                 return;
 211
 212         pr_err("in_send_command returned err %d\n", rc);
 213
 214         mutex_lock(&ddev->cmd_lock);
 215         list_del(&cmd->queue);
 216         mutex_unlock(&ddev->cmd_lock);
 217
 218         kfree_skb(cmd->req);
 219         kfree(cmd->mdaa_params);
 220         kfree(cmd);
 221
 222         schedule_work(&ddev->cmd_work);
 223 }
 224
 225 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
 226                      struct sk_buff *skb, struct digital_tg_mdaa_params *params,
 227                      u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
 228                      void *cb_context)
 229 {
 230         struct digital_cmd *cmd;
 231
 232         cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
 233         if (!cmd)
 234                 return -ENOMEM;
 235
 236         cmd->type = cmd_type;
 237         cmd->timeout = timeout;
 238         cmd->req = skb;
 239         cmd->mdaa_params = params;
 240         cmd->cmd_cb = cmd_cb;
 241         cmd->cb_context = cb_context;
 242         INIT_LIST_HEAD(&cmd->queue);
 243
 244         mutex_lock(&ddev->cmd_lock);
 245         list_add_tail(&cmd->queue, &ddev->cmd_queue);
 246         mutex_unlock(&ddev->cmd_lock);
 247
 248         schedule_work(&ddev->cmd_work);
 249
 250         return 0;
 251 }
 252
 253 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
 254 {
 255         int rc;
 256
 257         rc = ddev->ops->in_configure_hw(ddev, type, param);
 258         if (rc)
 259                 pr_err("in_configure_hw failed: %d\n", rc);
 260
 261         return rc;
 262 }
 263
 264 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
 265 {
 266         int rc;
 267
 268         rc = ddev->ops->tg_configure_hw(ddev, type, param);
 269         if (rc)
 270                 pr_err("tg_configure_hw failed: %d\n", rc);
 271
 272         return rc;
 273 }
 274
 275 static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
 276 {
 277         struct digital_tg_mdaa_params *params;
 278
 279         params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
 280         if (!params)
 281                 return -ENOMEM;
 282
 283         params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
 284         get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
 285         params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
 286
 287         params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
 288         params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
 289         get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
 290         params->sc = DIGITAL_SENSF_FELICA_SC;
 291
 292         return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
 293                                 500, digital_tg_recv_atr_req, NULL);
 294 }
 295
 296 int digital_target_found(struct nfc_digital_dev *ddev,
 297                          struct nfc_target *target, u8 protocol)
 298 {
 299         int rc;
 300         u8 framing;
 301         u8 rf_tech;
 302         int (*check_crc)(struct sk_buff *skb);
 303         void (*add_crc)(struct sk_buff *skb);
 304
 305         rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
 306
 307         switch (protocol) {
 308         case NFC_PROTO_JEWEL:
 309                 framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
 310                 check_crc = digital_skb_check_crc_b;
 311                 add_crc = digital_skb_add_crc_b;
 312                 break;
 313
 314         case NFC_PROTO_MIFARE:
 315                 framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
 316                 check_crc = digital_skb_check_crc_a;
 317                 add_crc = digital_skb_add_crc_a;
 318                 break;
 319
 320         case NFC_PROTO_FELICA:
 321                 framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
 322                 check_crc = digital_skb_check_crc_f;
 323                 add_crc = digital_skb_add_crc_f;
 324                 break;
 325
 326         case NFC_PROTO_NFC_DEP:
 327                 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
 328                         framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
 329                         check_crc = digital_skb_check_crc_a;
 330                         add_crc = digital_skb_add_crc_a;
 331                 } else {
 332                         framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
 333                         check_crc = digital_skb_check_crc_f;
 334                         add_crc = digital_skb_add_crc_f;
 335                 }
 336                 break;
 337
 338         case NFC_PROTO_ISO15693:
 339                 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
 340                 check_crc = digital_skb_check_crc_b;
 341                 add_crc = digital_skb_add_crc_b;
 342                 break;
 343
 344         case NFC_PROTO_ISO14443:
 345                 framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
 346                 check_crc = digital_skb_check_crc_a;
 347                 add_crc = digital_skb_add_crc_a;
 348                 break;
 349
 350         case NFC_PROTO_ISO14443_B:
 351                 framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
 352                 check_crc = digital_skb_check_crc_b;
 353                 add_crc = digital_skb_add_crc_b;
 354                 break;
 355
 356         default:
 357                 pr_err("Invalid protocol %d\n", protocol);
 358                 return -EINVAL;
 359         }
 360
 361         pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
 362
 363         ddev->curr_rf_tech = rf_tech;
 364
 365         if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
 366                 ddev->skb_add_crc = digital_skb_add_crc_none;
 367                 ddev->skb_check_crc = digital_skb_check_crc_none;
 368         } else {
 369                 ddev->skb_add_crc = add_crc;
 370                 ddev->skb_check_crc = check_crc;
 371         }
 372
 373         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
 374         if (rc)
 375                 return rc;
 376
 377         target->supported_protocols = (1 << protocol);
 378         rc = nfc_targets_found(ddev->nfc_dev, target, 1);
 379         if (rc)
 380                 return rc;
 381
 382         ddev->poll_tech_count = 0;
 383
 384         return 0;
 385 }
 386
 387 void digital_poll_next_tech(struct nfc_digital_dev *ddev)
 388 {
 389         u8 rand_mod;
 390
 391         digital_switch_rf(ddev, 0);
 392
 393         mutex_lock(&ddev->poll_lock);
 394
 395         if (!ddev->poll_tech_count) {
 396                 mutex_unlock(&ddev->poll_lock);
 397                 return;
 398         }
 399
 400         get_random_bytes(&rand_mod, sizeof(rand_mod));
 401         ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
 402
 403         mutex_unlock(&ddev->poll_lock);
 404
 405         schedule_work(&ddev->poll_work);
 406 }
 407
 408 static void digital_wq_poll(struct work_struct *work)
 409 {
 410         int rc;
 411         struct digital_poll_tech *poll_tech;
 412         struct nfc_digital_dev *ddev = container_of(work,
 413                                                     struct nfc_digital_dev,
 414                                                     poll_work);
 415         mutex_lock(&ddev->poll_lock);
 416
 417         if (!ddev->poll_tech_count) {
 418                 mutex_unlock(&ddev->poll_lock);
 419                 return;
 420         }
 421
 422         poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
 423
 424         mutex_unlock(&ddev->poll_lock);
 425
 426         rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
 427         if (rc)
 428                 digital_poll_next_tech(ddev);
 429 }
 430
 431 static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
 432                                   digital_poll_t poll_func)
 433 {
 434         struct digital_poll_tech *poll_tech;
 435
 436         if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
 437                 return;
 438
 439         poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
 440
 441         poll_tech->rf_tech = rf_tech;
 442         poll_tech->poll_func = poll_func;
 443 }
 444
 445 /**
 446  * start_poll operation
 447  *
 448  * For every supported protocol, the corresponding polling function is added
 449  * to the table of polling technologies (ddev->poll_techs[]) using
 450  * digital_add_poll_tech().
 451  * When a polling function fails (by timeout or protocol error) the next one is
 452  * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
 453  */
 454 static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
 455                               __u32 tm_protocols)
 456 {
 457         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 458         u32 matching_im_protocols, matching_tm_protocols;
 459
 460         pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
 461                  tm_protocols, ddev->protocols);
 462
 463         matching_im_protocols = ddev->protocols & im_protocols;
 464         matching_tm_protocols = ddev->protocols & tm_protocols;
 465
 466         if (!matching_im_protocols && !matching_tm_protocols) {
 467                 pr_err("Unknown protocol\n");
 468                 return -EINVAL;
 469         }
 470
 471         if (ddev->poll_tech_count) {
 472                 pr_err("Already polling\n");
 473                 return -EBUSY;
 474         }
 475
 476         if (ddev->curr_protocol) {
 477                 pr_err("A target is already active\n");
 478                 return -EBUSY;
 479         }
 480
 481         ddev->poll_tech_count = 0;
 482         ddev->poll_tech_index = 0;
 483
 484         if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
 485                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
 486                                       digital_in_send_sens_req);
 487
 488         if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
 489                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
 490                                       digital_in_send_sensb_req);
 491
 492         if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
 493                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
 494                                       digital_in_send_sensf_req);
 495
 496                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
 497                                       digital_in_send_sensf_req);
 498         }
 499
 500         if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
 501                 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
 502                                       digital_in_send_iso15693_inv_req);
 503
 504         if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
 505                 if (ddev->ops->tg_listen_mdaa) {
 506                         digital_add_poll_tech(ddev, 0,
 507                                               digital_tg_listen_mdaa);
 508                 } else {
 509                         digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
 510                                               digital_tg_listen_nfca);
 511
 512                         digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
 513                                               digital_tg_listen_nfcf);
 514
 515                         digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
 516                                               digital_tg_listen_nfcf);
 517                 }
 518         }
 519
 520         if (!ddev->poll_tech_count) {
 521                 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
 522                        matching_im_protocols, matching_tm_protocols);
 523                 return -EINVAL;
 524         }
 525
 526         schedule_work(&ddev->poll_work);
 527
 528         return 0;
 529 }
 530
 531 static void digital_stop_poll(struct nfc_dev *nfc_dev)
 532 {
 533         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 534
 535         mutex_lock(&ddev->poll_lock);
 536
 537         if (!ddev->poll_tech_count) {
 538                 pr_err("Polling operation was not running\n");
 539                 mutex_unlock(&ddev->poll_lock);
 540                 return;
 541         }
 542
 543         ddev->poll_tech_count = 0;
 544
 545         mutex_unlock(&ddev->poll_lock);
 546
 547         cancel_work_sync(&ddev->poll_work);
 548
 549         digital_abort_cmd(ddev);
 550 }
 551
 552 static int digital_dev_up(struct nfc_dev *nfc_dev)
 553 {
 554         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 555
 556         digital_switch_rf(ddev, 1);
 557
 558         return 0;
 559 }
 560
 561 static int digital_dev_down(struct nfc_dev *nfc_dev)
 562 {
 563         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 564
 565         digital_switch_rf(ddev, 0);
 566
 567         return 0;
 568 }
 569
 570 static int digital_dep_link_up(struct nfc_dev *nfc_dev,
 571                                struct nfc_target *target,
 572                                __u8 comm_mode, __u8 *gb, size_t gb_len)
 573 {
 574         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 575         int rc;
 576
 577         rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
 578
 579         if (!rc)
 580                 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
 581
 582         return rc;
 583 }
 584
 585 static int digital_dep_link_down(struct nfc_dev *nfc_dev)
 586 {
 587         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 588
 589         ddev->curr_protocol = 0;
 590
 591         return 0;
 592 }
 593
 594 static int digital_activate_target(struct nfc_dev *nfc_dev,
 595                                    struct nfc_target *target, __u32 protocol)
 596 {
 597         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 598
 599         if (ddev->poll_tech_count) {
 600                 pr_err("Can't activate a target while polling\n");
 601                 return -EBUSY;
 602         }
 603
 604         if (ddev->curr_protocol) {
 605                 pr_err("A target is already active\n");
 606                 return -EBUSY;
 607         }
 608
 609         ddev->curr_protocol = protocol;
 610
 611         return 0;
 612 }
 613
 614 static void digital_deactivate_target(struct nfc_dev *nfc_dev,
 615                                       struct nfc_target *target)
 616 {
 617         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 618
 619         if (!ddev->curr_protocol) {
 620                 pr_err("No active target\n");
 621                 return;
 622         }
 623
 624         ddev->curr_protocol = 0;
 625 }
 626
 627 static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
 628 {
 629         struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
 630
 631         return digital_tg_send_dep_res(ddev, skb);
 632 }
 633
 634 static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
 635                                      struct sk_buff *resp)
 636 {
 637         struct digital_data_exch *data_exch = arg;
 638         int rc;
 639
 640         if (IS_ERR(resp)) {
 641                 rc = PTR_ERR(resp);
 642                 resp = NULL;
 643                 goto done;
 644         }
 645
 646         if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
 647                 rc = digital_in_recv_mifare_res(resp);
 648                 /* crc check is done in digital_in_recv_mifare_res() */
 649                 goto done;
 650         }
 651
 652         if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
 653             (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
 654                 rc = digital_in_iso_dep_pull_sod(ddev, resp);
 655                 if (rc)
 656                         goto done;
 657         }
 658
 659         rc = ddev->skb_check_crc(resp);
 660
 661 done:
 662         if (rc) {
 663                 kfree_skb(resp);
 664                 resp = NULL;
 665         }
 666
 667         data_exch->cb(data_exch->cb_context, resp, rc);
 668
 669         kfree(data_exch);
 670 }
 671
 672 static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
 673                            struct sk_buff *skb, data_exchange_cb_t cb,
 674                            void *cb_context)
 675 {
 676         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 677         struct digital_data_exch *data_exch;
 678         int rc;
 679
 680         data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
 681         if (!data_exch) {
 682                 pr_err("Failed to allocate data_exch struct\n");
 683                 return -ENOMEM;
 684         }
 685
 686         data_exch->cb = cb;
 687         data_exch->cb_context = cb_context;
 688
 689         if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
 690                 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
 691                 goto exit;
 692         }
 693
 694         if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
 695             (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
 696                 rc = digital_in_iso_dep_push_sod(ddev, skb);
 697                 if (rc)
 698                         goto exit;
 699         }
 700
 701         ddev->skb_add_crc(skb);
 702
 703         rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
 704                                  data_exch);
 705
 706 exit:
 707         if (rc)
 708                 kfree(data_exch);
 709
 710         return rc;
 711 }
 712
 713 static struct nfc_ops digital_nfc_ops = {
 714         .dev_up = digital_dev_up,
 715         .dev_down = digital_dev_down,
 716         .start_poll = digital_start_poll,
 717         .stop_poll = digital_stop_poll,
 718         .dep_link_up = digital_dep_link_up,
 719         .dep_link_down = digital_dep_link_down,
 720         .activate_target = digital_activate_target,
 721         .deactivate_target = digital_deactivate_target,
 722         .tm_send = digital_tg_send,
 723         .im_transceive = digital_in_send,
 724 };
 725
 726 struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
 727                                             __u32 supported_protocols,
 728                                             __u32 driver_capabilities,
 729                                             int tx_headroom, int tx_tailroom)
 730 {
 731         struct nfc_digital_dev *ddev;
 732
 733         if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
 734             !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
 735             !ops->switch_rf)
 736                 return NULL;
 737
 738         ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
 739         if (!ddev)
 740                 return NULL;
 741
 742         ddev->driver_capabilities = driver_capabilities;
 743         ddev->ops = ops;
 744
 745         mutex_init(&ddev->cmd_lock);
 746         INIT_LIST_HEAD(&ddev->cmd_queue);
 747
 748         INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
 749         INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
 750
 751         mutex_init(&ddev->poll_lock);
 752         INIT_WORK(&ddev->poll_work, digital_wq_poll);
 753
 754         if (supported_protocols & NFC_PROTO_JEWEL_MASK)
 755                 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
 756         if (supported_protocols & NFC_PROTO_MIFARE_MASK)
 757                 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
 758         if (supported_protocols & NFC_PROTO_FELICA_MASK)
 759                 ddev->protocols |= NFC_PROTO_FELICA_MASK;
 760         if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
 761                 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
 762         if (supported_protocols & NFC_PROTO_ISO15693_MASK)
 763                 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
 764         if (supported_protocols & NFC_PROTO_ISO14443_MASK)
 765                 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
 766         if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
 767                 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
 768
 769         ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
 770         ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
 771
 772         ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
 773                                             ddev->tx_headroom,
 774                                             ddev->tx_tailroom);
 775         if (!ddev->nfc_dev) {
 776                 pr_err("nfc_allocate_device failed\n");
 777                 goto free_dev;
 778         }
 779
 780         nfc_set_drvdata(ddev->nfc_dev, ddev);
 781
 782         return ddev;
 783
 784 free_dev:
 785         kfree(ddev);
 786
 787         return NULL;
 788 }
 789 EXPORT_SYMBOL(nfc_digital_allocate_device);
 790
 791 void nfc_digital_free_device(struct nfc_digital_dev *ddev)
 792 {
 793         nfc_free_device(ddev->nfc_dev);
 794         kfree(ddev);
 795 }
 796 EXPORT_SYMBOL(nfc_digital_free_device);
 797
 798 int nfc_digital_register_device(struct nfc_digital_dev *ddev)
 799 {
 800         return nfc_register_device(ddev->nfc_dev);
 801 }
 802 EXPORT_SYMBOL(nfc_digital_register_device);
 803
 804 void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
 805 {
 806         struct digital_cmd *cmd, *n;
 807
 808         nfc_unregister_device(ddev->nfc_dev);
 809
 810         mutex_lock(&ddev->poll_lock);
 811         ddev->poll_tech_count = 0;
 812         mutex_unlock(&ddev->poll_lock);
 813
 814         cancel_work_sync(&ddev->poll_work);
 815         cancel_work_sync(&ddev->cmd_work);
 816         cancel_work_sync(&ddev->cmd_complete_work);
 817
 818         list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
 819                 list_del(&cmd->queue);
 820                 kfree(cmd->mdaa_params);
 821                 kfree(cmd);
 822         }
 823 }
 824 EXPORT_SYMBOL(nfc_digital_unregister_device);
 825
 826 MODULE_LICENSE("GPL");