net/nfc/hci/core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2012  Intel Corporation. All rights reserved.
   4  */
   5
   6 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
   7
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/nfc.h>
  12
  13 #include <net/nfc/nfc.h>
  14 #include <net/nfc/hci.h>
  15 #include <net/nfc/llc.h>
  16
  17 #include "hci.h"
  18
  19 /* Largest headroom needed for outgoing HCI commands */
  20 #define HCI_CMDS_HEADROOM 1
  21
  22 int nfc_hci_result_to_errno(u8 result)
  23 {
  24         switch (result) {
  25         case NFC_HCI_ANY_OK:
  26                 return 0;
  27         case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
  28                 return -EOPNOTSUPP;
  29         case NFC_HCI_ANY_E_TIMEOUT:
  30                 return -ETIME;
  31         default:
  32                 return -1;
  33         }
  34 }
  35 EXPORT_SYMBOL(nfc_hci_result_to_errno);
  36
  37 void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
  38 {
  39         int i = 0;
  40
  41         for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
  42                 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
  43                 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
  44         }
  45         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
  46 }
  47 EXPORT_SYMBOL(nfc_hci_reset_pipes);
  48
  49 void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
  50 {
  51         int i = 0;
  52
  53         for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
  54                 if (hdev->pipes[i].dest_host != host)
  55                         continue;
  56
  57                 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
  58                 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
  59         }
  60 }
  61 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
  62
  63 static void nfc_hci_msg_tx_work(struct work_struct *work)
  64 {
  65         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
  66                                                 msg_tx_work);
  67         struct hci_msg *msg;
  68         struct sk_buff *skb;
  69         int r = 0;
  70
  71         mutex_lock(&hdev->msg_tx_mutex);
  72         if (hdev->shutting_down)
  73                 goto exit;
  74
  75         if (hdev->cmd_pending_msg) {
  76                 if (timer_pending(&hdev->cmd_timer) == 0) {
  77                         if (hdev->cmd_pending_msg->cb)
  78                                 hdev->cmd_pending_msg->cb(hdev->
  79                                                           cmd_pending_msg->
  80                                                           cb_context,
  81                                                           NULL,
  82                                                           -ETIME);
  83                         kfree(hdev->cmd_pending_msg);
  84                         hdev->cmd_pending_msg = NULL;
  85                 } else {
  86                         goto exit;
  87                 }
  88         }
  89
  90 next_msg:
  91         if (list_empty(&hdev->msg_tx_queue))
  92                 goto exit;
  93
  94         msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
  95         list_del(&msg->msg_l);
  96
  97         pr_debug("msg_tx_queue has a cmd to send\n");
  98         while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
  99                 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
 100                 if (r < 0) {
 101                         kfree_skb(skb);
 102                         skb_queue_purge(&msg->msg_frags);
 103                         if (msg->cb)
 104                                 msg->cb(msg->cb_context, NULL, r);
 105                         kfree(msg);
 106                         break;
 107                 }
 108         }
 109
 110         if (r)
 111                 goto next_msg;
 112
 113         if (msg->wait_response == false) {
 114                 kfree(msg);
 115                 goto next_msg;
 116         }
 117
 118         hdev->cmd_pending_msg = msg;
 119         mod_timer(&hdev->cmd_timer, jiffies +
 120                   msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
 121
 122 exit:
 123         mutex_unlock(&hdev->msg_tx_mutex);
 124 }
 125
 126 static void nfc_hci_msg_rx_work(struct work_struct *work)
 127 {
 128         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 129                                                 msg_rx_work);
 130         struct sk_buff *skb;
 131         struct hcp_message *message;
 132         u8 pipe;
 133         u8 type;
 134         u8 instruction;
 135
 136         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 137                 pipe = skb->data[0];
 138                 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
 139                 message = (struct hcp_message *)skb->data;
 140                 type = HCP_MSG_GET_TYPE(message->header);
 141                 instruction = HCP_MSG_GET_CMD(message->header);
 142                 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 143
 144                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
 145         }
 146 }
 147
 148 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
 149                                      struct sk_buff *skb)
 150 {
 151         del_timer_sync(&hdev->cmd_timer);
 152
 153         if (hdev->cmd_pending_msg->cb)
 154                 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
 155                                           skb, err);
 156         else
 157                 kfree_skb(skb);
 158
 159         kfree(hdev->cmd_pending_msg);
 160         hdev->cmd_pending_msg = NULL;
 161
 162         schedule_work(&hdev->msg_tx_work);
 163 }
 164
 165 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
 166                            struct sk_buff *skb)
 167 {
 168         mutex_lock(&hdev->msg_tx_mutex);
 169
 170         if (hdev->cmd_pending_msg == NULL) {
 171                 kfree_skb(skb);
 172                 goto exit;
 173         }
 174
 175         __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
 176
 177 exit:
 178         mutex_unlock(&hdev->msg_tx_mutex);
 179 }
 180
 181 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 182                           struct sk_buff *skb)
 183 {
 184         u8 gate = hdev->pipes[pipe].gate;
 185         u8 status = NFC_HCI_ANY_OK;
 186         struct hci_create_pipe_resp *create_info;
 187         struct hci_delete_pipe_noti *delete_info;
 188         struct hci_all_pipe_cleared_noti *cleared_info;
 189
 190         pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
 191
 192         switch (cmd) {
 193         case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
 194                 if (skb->len != 5) {
 195                         status = NFC_HCI_ANY_E_NOK;
 196                         goto exit;
 197                 }
 198                 create_info = (struct hci_create_pipe_resp *)skb->data;
 199
 200                 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
 201                         status = NFC_HCI_ANY_E_NOK;
 202                         goto exit;
 203                 }
 204
 205                 /* Save the new created pipe and bind with local gate,
 206                  * the description for skb->data[3] is destination gate id
 207                  * but since we received this cmd from host controller, we
 208                  * are the destination and it is our local gate
 209                  */
 210                 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
 211                 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
 212                 hdev->pipes[create_info->pipe].dest_host =
 213                                                         create_info->src_host;
 214                 break;
 215         case NFC_HCI_ANY_OPEN_PIPE:
 216                 if (gate == NFC_HCI_INVALID_GATE) {
 217                         status = NFC_HCI_ANY_E_NOK;
 218                         goto exit;
 219                 }
 220                 break;
 221         case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
 222                 if (skb->len != 1) {
 223                         status = NFC_HCI_ANY_E_NOK;
 224                         goto exit;
 225                 }
 226                 delete_info = (struct hci_delete_pipe_noti *)skb->data;
 227
 228                 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
 229                         status = NFC_HCI_ANY_E_NOK;
 230                         goto exit;
 231                 }
 232
 233                 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
 234                 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
 235                 break;
 236         case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 237                 if (skb->len != 1) {
 238                         status = NFC_HCI_ANY_E_NOK;
 239                         goto exit;
 240                 }
 241                 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
 242
 243                 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
 244                 break;
 245         default:
 246                 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 247                 break;
 248         }
 249
 250         if (hdev->ops->cmd_received)
 251                 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
 252
 253 exit:
 254         nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
 255                                status, NULL, 0, NULL, NULL, 0);
 256
 257         kfree_skb(skb);
 258 }
 259
 260 u32 nfc_hci_sak_to_protocol(u8 sak)
 261 {
 262         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
 263         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
 264                 return NFC_PROTO_MIFARE_MASK;
 265         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
 266                 return NFC_PROTO_ISO14443_MASK;
 267         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
 268                 return NFC_PROTO_NFC_DEP_MASK;
 269         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
 270                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
 271         default:
 272                 return 0xffffffff;
 273         }
 274 }
 275 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
 276
 277 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
 278 {
 279         struct nfc_target *targets;
 280         struct sk_buff *atqa_skb = NULL;
 281         struct sk_buff *sak_skb = NULL;
 282         struct sk_buff *uid_skb = NULL;
 283         int r;
 284
 285         pr_debug("from gate %d\n", gate);
 286
 287         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 288         if (targets == NULL)
 289                 return -ENOMEM;
 290
 291         switch (gate) {
 292         case NFC_HCI_RF_READER_A_GATE:
 293                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 294                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
 295                 if (r < 0)
 296                         goto exit;
 297
 298                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 299                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
 300                 if (r < 0)
 301                         goto exit;
 302
 303                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
 304                         r = -EPROTO;
 305                         goto exit;
 306                 }
 307
 308                 targets->supported_protocols =
 309                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
 310                 if (targets->supported_protocols == 0xffffffff) {
 311                         r = -EPROTO;
 312                         goto exit;
 313                 }
 314
 315                 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
 316                 targets->sel_res = sak_skb->data[0];
 317
 318                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 319                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
 320                 if (r < 0)
 321                         goto exit;
 322
 323                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 324                         r = -EPROTO;
 325                         goto exit;
 326                 }
 327
 328                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
 329                 targets->nfcid1_len = uid_skb->len;
 330
 331                 if (hdev->ops->complete_target_discovered) {
 332                         r = hdev->ops->complete_target_discovered(hdev, gate,
 333                                                                   targets);
 334                         if (r < 0)
 335                                 goto exit;
 336                 }
 337                 break;
 338         case NFC_HCI_RF_READER_B_GATE:
 339                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 340                 break;
 341         default:
 342                 if (hdev->ops->target_from_gate)
 343                         r = hdev->ops->target_from_gate(hdev, gate, targets);
 344                 else
 345                         r = -EPROTO;
 346                 if (r < 0)
 347                         goto exit;
 348
 349                 if (hdev->ops->complete_target_discovered) {
 350                         r = hdev->ops->complete_target_discovered(hdev, gate,
 351                                                                   targets);
 352                         if (r < 0)
 353                                 goto exit;
 354                 }
 355                 break;
 356         }
 357
 358         /* if driver set the new gate, we will skip the old one */
 359         if (targets->hci_reader_gate == 0x00)
 360                 targets->hci_reader_gate = gate;
 361
 362         r = nfc_targets_found(hdev->ndev, targets, 1);
 363
 364 exit:
 365         kfree(targets);
 366         kfree_skb(atqa_skb);
 367         kfree_skb(sak_skb);
 368         kfree_skb(uid_skb);
 369
 370         return r;
 371 }
 372 EXPORT_SYMBOL(nfc_hci_target_discovered);
 373
 374 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 375                             struct sk_buff *skb)
 376 {
 377         int r = 0;
 378         u8 gate = hdev->pipes[pipe].gate;
 379
 380         if (gate == NFC_HCI_INVALID_GATE) {
 381                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
 382                 goto exit;
 383         }
 384
 385         if (hdev->ops->event_received) {
 386                 r = hdev->ops->event_received(hdev, pipe, event, skb);
 387                 if (r <= 0)
 388                         goto exit_noskb;
 389         }
 390
 391         switch (event) {
 392         case NFC_HCI_EVT_TARGET_DISCOVERED:
 393                 if (skb->len < 1) {     /* no status data? */
 394                         r = -EPROTO;
 395                         goto exit;
 396                 }
 397
 398                 if (skb->data[0] == 3) {
 399                         /* TODO: Multiple targets in field, none activated
 400                          * poll is supposedly stopped, but there is no
 401                          * single target to activate, so nothing to report
 402                          * up.
 403                          * if we need to restart poll, we must save the
 404                          * protocols from the initial poll and reuse here.
 405                          */
 406                 }
 407
 408                 if (skb->data[0] != 0) {
 409                         r = -EPROTO;
 410                         goto exit;
 411                 }
 412
 413                 r = nfc_hci_target_discovered(hdev, gate);
 414                 break;
 415         default:
 416                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
 417                 r = -EINVAL;
 418                 break;
 419         }
 420
 421 exit:
 422         kfree_skb(skb);
 423
 424 exit_noskb:
 425         if (r)
 426                 nfc_hci_driver_failure(hdev, r);
 427 }
 428
 429 static void nfc_hci_cmd_timeout(struct timer_list *t)
 430 {
 431         struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
 432
 433         schedule_work(&hdev->msg_tx_work);
 434 }
 435
 436 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 437                                  struct nfc_hci_gate *gates)
 438 {
 439         int r;
 440         while (gate_count--) {
 441                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 442                                          gates->gate, gates->pipe);
 443                 if (r < 0)
 444                         return r;
 445                 gates++;
 446         }
 447
 448         return 0;
 449 }
 450
 451 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 452 {
 453         struct sk_buff *skb = NULL;
 454         int r;
 455
 456         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 457                 return -EPROTO;
 458
 459         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 460                                  hdev->init_data.gates[0].gate,
 461                                  hdev->init_data.gates[0].pipe);
 462         if (r < 0)
 463                 goto exit;
 464
 465         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 466                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 467         if (r < 0)
 468                 goto disconnect_all;
 469
 470         if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
 471                 (memcmp(hdev->init_data.session_id, skb->data,
 472                            skb->len) == 0) && hdev->ops->load_session) {
 473                 /* Restore gate<->pipe table from some proprietary location. */
 474
 475                 r = hdev->ops->load_session(hdev);
 476
 477                 if (r < 0)
 478                         goto disconnect_all;
 479         } else {
 480
 481                 r = nfc_hci_disconnect_all_gates(hdev);
 482                 if (r < 0)
 483                         goto exit;
 484
 485                 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 486                                           hdev->init_data.gates);
 487                 if (r < 0)
 488                         goto disconnect_all;
 489
 490                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 491                                 NFC_HCI_ADMIN_SESSION_IDENTITY,
 492                                 hdev->init_data.session_id,
 493                                 strlen(hdev->init_data.session_id));
 494         }
 495         if (r == 0)
 496                 goto exit;
 497
 498 disconnect_all:
 499         nfc_hci_disconnect_all_gates(hdev);
 500
 501 exit:
 502         kfree_skb(skb);
 503
 504         return r;
 505 }
 506
 507 static int hci_dev_version(struct nfc_hci_dev *hdev)
 508 {
 509         int r;
 510         struct sk_buff *skb;
 511
 512         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 513                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 514         if (r == -EOPNOTSUPP) {
 515                 pr_info("Software/Hardware info not available\n");
 516                 return 0;
 517         }
 518         if (r < 0)
 519                 return r;
 520
 521         if (skb->len != 3) {
 522                 kfree_skb(skb);
 523                 return -EINVAL;
 524         }
 525
 526         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 527         hdev->sw_patch = skb->data[0] & 0x0f;
 528         hdev->sw_flashlib_major = skb->data[1];
 529         hdev->sw_flashlib_minor = skb->data[2];
 530
 531         kfree_skb(skb);
 532
 533         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 534                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 535         if (r < 0)
 536                 return r;
 537
 538         if (skb->len != 3) {
 539                 kfree_skb(skb);
 540                 return -EINVAL;
 541         }
 542
 543         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 544         hdev->hw_version = skb->data[0] & 0x1f;
 545         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 546         hdev->hw_software = skb->data[1] & 0x3f;
 547         hdev->hw_bsid = skb->data[2];
 548
 549         kfree_skb(skb);
 550
 551         pr_info("SOFTWARE INFO:\n");
 552         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 553         pr_info("Patch          : %d\n", hdev->sw_patch);
 554         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 555         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 556         pr_info("HARDWARE INFO:\n");
 557         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 558         pr_info("HW Version     : %d\n", hdev->hw_version);
 559         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 560         pr_info("Software       : %d\n", hdev->hw_software);
 561         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 562
 563         return 0;
 564 }
 565
 566 static int hci_dev_up(struct nfc_dev *nfc_dev)
 567 {
 568         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 569         int r = 0;
 570
 571         if (hdev->ops->open) {
 572                 r = hdev->ops->open(hdev);
 573                 if (r < 0)
 574                         return r;
 575         }
 576
 577         r = nfc_llc_start(hdev->llc);
 578         if (r < 0)
 579                 goto exit_close;
 580
 581         r = hci_dev_session_init(hdev);
 582         if (r < 0)
 583                 goto exit_llc;
 584
 585         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 586                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 587         if (r < 0)
 588                 goto exit_llc;
 589
 590         if (hdev->ops->hci_ready) {
 591                 r = hdev->ops->hci_ready(hdev);
 592                 if (r < 0)
 593                         goto exit_llc;
 594         }
 595
 596         r = hci_dev_version(hdev);
 597         if (r < 0)
 598                 goto exit_llc;
 599
 600         return 0;
 601
 602 exit_llc:
 603         nfc_llc_stop(hdev->llc);
 604
 605 exit_close:
 606         if (hdev->ops->close)
 607                 hdev->ops->close(hdev);
 608
 609         return r;
 610 }
 611
 612 static int hci_dev_down(struct nfc_dev *nfc_dev)
 613 {
 614         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 615
 616         nfc_llc_stop(hdev->llc);
 617
 618         if (hdev->ops->close)
 619                 hdev->ops->close(hdev);
 620
 621         nfc_hci_reset_pipes(hdev);
 622
 623         return 0;
 624 }
 625
 626 static int hci_start_poll(struct nfc_dev *nfc_dev,
 627                           u32 im_protocols, u32 tm_protocols)
 628 {
 629         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 630
 631         if (hdev->ops->start_poll)
 632                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 633         else
 634                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 635                                           NFC_HCI_EVT_READER_REQUESTED,
 636                                           NULL, 0);
 637 }
 638
 639 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 640 {
 641         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 642
 643         if (hdev->ops->stop_poll)
 644                 hdev->ops->stop_poll(hdev);
 645         else
 646                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 647                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
 648 }
 649
 650 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 651                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 652 {
 653         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 654
 655         if (!hdev->ops->dep_link_up)
 656                 return 0;
 657
 658         return hdev->ops->dep_link_up(hdev, target, comm_mode,
 659                                       gb, gb_len);
 660 }
 661
 662 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 663 {
 664         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 665
 666         if (!hdev->ops->dep_link_down)
 667                 return 0;
 668
 669         return hdev->ops->dep_link_down(hdev);
 670 }
 671
 672 static int hci_activate_target(struct nfc_dev *nfc_dev,
 673                                struct nfc_target *target, u32 protocol)
 674 {
 675         return 0;
 676 }
 677
 678 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 679                                   struct nfc_target *target,
 680                                   u8 mode)
 681 {
 682 }
 683
 684 #define HCI_CB_TYPE_TRANSCEIVE 1
 685
 686 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 687 {
 688         struct nfc_hci_dev *hdev = context;
 689
 690         switch (hdev->async_cb_type) {
 691         case HCI_CB_TYPE_TRANSCEIVE:
 692                 /*
 693                  * TODO: Check RF Error indicator to make sure data is valid.
 694                  * It seems that HCI cmd can complete without error, but data
 695                  * can be invalid if an RF error occured? Ignore for now.
 696                  */
 697                 if (err == 0)
 698                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 699
 700                 hdev->async_cb(hdev->async_cb_context, skb, err);
 701                 break;
 702         default:
 703                 if (err == 0)
 704                         kfree_skb(skb);
 705                 break;
 706         }
 707 }
 708
 709 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 710                           struct sk_buff *skb, data_exchange_cb_t cb,
 711                           void *cb_context)
 712 {
 713         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 714         int r;
 715
 716         pr_debug("target_idx=%d\n", target->idx);
 717
 718         switch (target->hci_reader_gate) {
 719         case NFC_HCI_RF_READER_A_GATE:
 720         case NFC_HCI_RF_READER_B_GATE:
 721                 if (hdev->ops->im_transceive) {
 722                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 723                                                      cb_context);
 724                         if (r <= 0)     /* handled */
 725                                 break;
 726                 }
 727
 728                 *(u8 *)skb_push(skb, 1) = 0;    /* CTR, see spec:10.2.2.1 */
 729
 730                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 731                 hdev->async_cb = cb;
 732                 hdev->async_cb_context = cb_context;
 733
 734                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 735                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 736                                            skb->len, hci_transceive_cb, hdev);
 737                 break;
 738         default:
 739                 if (hdev->ops->im_transceive) {
 740                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 741                                                      cb_context);
 742                         if (r == 1)
 743                                 r = -ENOTSUPP;
 744                 } else {
 745                         r = -ENOTSUPP;
 746                 }
 747                 break;
 748         }
 749
 750         kfree_skb(skb);
 751
 752         return r;
 753 }
 754
 755 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 756 {
 757         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 758
 759         if (!hdev->ops->tm_send) {
 760                 kfree_skb(skb);
 761                 return -ENOTSUPP;
 762         }
 763
 764         return hdev->ops->tm_send(hdev, skb);
 765 }
 766
 767 static int hci_check_presence(struct nfc_dev *nfc_dev,
 768                               struct nfc_target *target)
 769 {
 770         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 771
 772         if (!hdev->ops->check_presence)
 773                 return 0;
 774
 775         return hdev->ops->check_presence(hdev, target);
 776 }
 777
 778 static int hci_discover_se(struct nfc_dev *nfc_dev)
 779 {
 780         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 781
 782         if (hdev->ops->discover_se)
 783                 return hdev->ops->discover_se(hdev);
 784
 785         return 0;
 786 }
 787
 788 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 789 {
 790         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 791
 792         if (hdev->ops->enable_se)
 793                 return hdev->ops->enable_se(hdev, se_idx);
 794
 795         return 0;
 796 }
 797
 798 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 799 {
 800         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 801
 802         if (hdev->ops->disable_se)
 803                 return hdev->ops->disable_se(hdev, se_idx);
 804
 805         return 0;
 806 }
 807
 808 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
 809                      u8 *apdu, size_t apdu_length,
 810                      se_io_cb_t cb, void *cb_context)
 811 {
 812         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 813
 814         if (hdev->ops->se_io)
 815                 return hdev->ops->se_io(hdev, se_idx, apdu,
 816                                         apdu_length, cb, cb_context);
 817
 818         return 0;
 819 }
 820
 821 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 822 {
 823         mutex_lock(&hdev->msg_tx_mutex);
 824
 825         if (hdev->cmd_pending_msg == NULL) {
 826                 nfc_driver_failure(hdev->ndev, err);
 827                 goto exit;
 828         }
 829
 830         __nfc_hci_cmd_completion(hdev, err, NULL);
 831
 832 exit:
 833         mutex_unlock(&hdev->msg_tx_mutex);
 834 }
 835
 836 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 837 {
 838         nfc_hci_failure(hdev, err);
 839 }
 840
 841 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 842 {
 843         struct hcp_packet *packet;
 844         u8 type;
 845         u8 instruction;
 846         struct sk_buff *hcp_skb;
 847         u8 pipe;
 848         struct sk_buff *frag_skb;
 849         int msg_len;
 850
 851         packet = (struct hcp_packet *)skb->data;
 852         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 853                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 854                 return;
 855         }
 856
 857         /* it's the last fragment. Does it need re-aggregation? */
 858         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 859                 pipe = packet->header & NFC_HCI_FRAGMENT;
 860                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 861
 862                 msg_len = 0;
 863                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 864                         msg_len += (frag_skb->len -
 865                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 866                 }
 867
 868                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 869                                              msg_len, GFP_KERNEL);
 870                 if (hcp_skb == NULL) {
 871                         nfc_hci_failure(hdev, -ENOMEM);
 872                         return;
 873                 }
 874
 875                 skb_put_u8(hcp_skb, pipe);
 876
 877                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 878                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 879                         skb_put_data(hcp_skb,
 880                                      frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 881                                      msg_len);
 882                 }
 883
 884                 skb_queue_purge(&hdev->rx_hcp_frags);
 885         } else {
 886                 packet->header &= NFC_HCI_FRAGMENT;
 887                 hcp_skb = skb;
 888         }
 889
 890         /* if this is a response, dispatch immediately to
 891          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 892          * in separate context where handler can also execute command.
 893          */
 894         packet = (struct hcp_packet *)hcp_skb->data;
 895         type = HCP_MSG_GET_TYPE(packet->message.header);
 896         if (type == NFC_HCI_HCP_RESPONSE) {
 897                 pipe = packet->header;
 898                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 899                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 900                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 901                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 902         } else {
 903                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 904                 schedule_work(&hdev->msg_rx_work);
 905         }
 906 }
 907
 908 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
 909 {
 910         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 911
 912         if (!hdev->ops->fw_download)
 913                 return -ENOTSUPP;
 914
 915         return hdev->ops->fw_download(hdev, firmware_name);
 916 }
 917
 918 static struct nfc_ops hci_nfc_ops = {
 919         .dev_up = hci_dev_up,
 920         .dev_down = hci_dev_down,
 921         .start_poll = hci_start_poll,
 922         .stop_poll = hci_stop_poll,
 923         .dep_link_up = hci_dep_link_up,
 924         .dep_link_down = hci_dep_link_down,
 925         .activate_target = hci_activate_target,
 926         .deactivate_target = hci_deactivate_target,
 927         .im_transceive = hci_transceive,
 928         .tm_send = hci_tm_send,
 929         .check_presence = hci_check_presence,
 930         .fw_download = hci_fw_download,
 931         .discover_se = hci_discover_se,
 932         .enable_se = hci_enable_se,
 933         .disable_se = hci_disable_se,
 934         .se_io = hci_se_io,
 935 };
 936
 937 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 938                                             struct nfc_hci_init_data *init_data,
 939                                             unsigned long quirks,
 940                                             u32 protocols,
 941                                             const char *llc_name,
 942                                             int tx_headroom,
 943                                             int tx_tailroom,
 944                                             int max_link_payload)
 945 {
 946         struct nfc_hci_dev *hdev;
 947
 948         if (ops->xmit == NULL)
 949                 return NULL;
 950
 951         if (protocols == 0)
 952                 return NULL;
 953
 954         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 955         if (hdev == NULL)
 956                 return NULL;
 957
 958         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 959                                      nfc_hci_recv_from_llc, tx_headroom,
 960                                      tx_tailroom, nfc_hci_llc_failure);
 961         if (hdev->llc == NULL) {
 962                 kfree(hdev);
 963                 return NULL;
 964         }
 965
 966         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 967                                          tx_headroom + HCI_CMDS_HEADROOM,
 968                                          tx_tailroom);
 969         if (!hdev->ndev) {
 970                 nfc_llc_free(hdev->llc);
 971                 kfree(hdev);
 972                 return NULL;
 973         }
 974
 975         hdev->ops = ops;
 976         hdev->max_data_link_payload = max_link_payload;
 977         hdev->init_data = *init_data;
 978
 979         nfc_set_drvdata(hdev->ndev, hdev);
 980
 981         nfc_hci_reset_pipes(hdev);
 982
 983         hdev->quirks = quirks;
 984
 985         return hdev;
 986 }
 987 EXPORT_SYMBOL(nfc_hci_allocate_device);
 988
 989 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 990 {
 991         nfc_free_device(hdev->ndev);
 992         nfc_llc_free(hdev->llc);
 993         kfree(hdev);
 994 }
 995 EXPORT_SYMBOL(nfc_hci_free_device);
 996
 997 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
 998 {
 999         mutex_init(&hdev->msg_tx_mutex);
1000
1001         INIT_LIST_HEAD(&hdev->msg_tx_queue);
1002
1003         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1004
1005         timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1006
1007         skb_queue_head_init(&hdev->rx_hcp_frags);
1008
1009         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1010
1011         skb_queue_head_init(&hdev->msg_rx_queue);
1012
1013         return nfc_register_device(hdev->ndev);
1014 }
1015 EXPORT_SYMBOL(nfc_hci_register_device);
1016
1017 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1018 {
1019         struct hci_msg *msg, *n;
1020
1021         mutex_lock(&hdev->msg_tx_mutex);
1022
1023         if (hdev->cmd_pending_msg) {
1024                 if (hdev->cmd_pending_msg->cb)
1025                         hdev->cmd_pending_msg->cb(
1026                                              hdev->cmd_pending_msg->cb_context,
1027                                              NULL, -ESHUTDOWN);
1028                 kfree(hdev->cmd_pending_msg);
1029                 hdev->cmd_pending_msg = NULL;
1030         }
1031
1032         hdev->shutting_down = true;
1033
1034         mutex_unlock(&hdev->msg_tx_mutex);
1035
1036         del_timer_sync(&hdev->cmd_timer);
1037         cancel_work_sync(&hdev->msg_tx_work);
1038
1039         cancel_work_sync(&hdev->msg_rx_work);
1040
1041         nfc_unregister_device(hdev->ndev);
1042
1043         skb_queue_purge(&hdev->rx_hcp_frags);
1044         skb_queue_purge(&hdev->msg_rx_queue);
1045
1046         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1047                 list_del(&msg->msg_l);
1048                 skb_queue_purge(&msg->msg_frags);
1049                 kfree(msg);
1050         }
1051 }
1052 EXPORT_SYMBOL(nfc_hci_unregister_device);
1053
1054 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1055 {
1056         hdev->clientdata = clientdata;
1057 }
1058 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1059
1060 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1061 {
1062         return hdev->clientdata;
1063 }
1064 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1065
1066 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1067 {
1068         nfc_hci_failure(hdev, err);
1069 }
1070 EXPORT_SYMBOL(nfc_hci_driver_failure);
1071
1072 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1073 {
1074         nfc_llc_rcv_from_drv(hdev->llc, skb);
1075 }
1076 EXPORT_SYMBOL(nfc_hci_recv_frame);
1077
1078 static int __init nfc_hci_init(void)
1079 {
1080         return nfc_llc_init();
1081 }
1082
1083 static void __exit nfc_hci_exit(void)
1084 {
1085         nfc_llc_exit();
1086 }
1087
1088 subsys_initcall(nfc_hci_init);
1089 module_exit(nfc_hci_exit);
1090
1091 MODULE_LICENSE("GPL");
1092 MODULE_DESCRIPTION("NFC HCI Core");