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