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 status = NFC_HCI_ANY_OK;
 185         struct hci_create_pipe_resp *create_info;
 186         struct hci_delete_pipe_noti *delete_info;
 187         struct hci_all_pipe_cleared_noti *cleared_info;
 188         u8 gate;
 189
 190         pr_debug("from pipe %x cmd %x\n", pipe, cmd);
 191
 192         if (pipe >= NFC_HCI_MAX_PIPES) {
 193                 status = NFC_HCI_ANY_E_NOK;
 194                 goto exit;
 195         }
 196
 197         gate = hdev->pipes[pipe].gate;
 198
 199         switch (cmd) {
 200         case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
 201                 if (skb->len != 5) {
 202                         status = NFC_HCI_ANY_E_NOK;
 203                         goto exit;
 204                 }
 205                 create_info = (struct hci_create_pipe_resp *)skb->data;
 206
 207                 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
 208                         status = NFC_HCI_ANY_E_NOK;
 209                         goto exit;
 210                 }
 211
 212                 /* Save the new created pipe and bind with local gate,
 213                  * the description for skb->data[3] is destination gate id
 214                  * but since we received this cmd from host controller, we
 215                  * are the destination and it is our local gate
 216                  */
 217                 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
 218                 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
 219                 hdev->pipes[create_info->pipe].dest_host =
 220                                                         create_info->src_host;
 221                 break;
 222         case NFC_HCI_ANY_OPEN_PIPE:
 223                 if (gate == NFC_HCI_INVALID_GATE) {
 224                         status = NFC_HCI_ANY_E_NOK;
 225                         goto exit;
 226                 }
 227                 break;
 228         case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
 229                 if (skb->len != 1) {
 230                         status = NFC_HCI_ANY_E_NOK;
 231                         goto exit;
 232                 }
 233                 delete_info = (struct hci_delete_pipe_noti *)skb->data;
 234
 235                 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
 236                         status = NFC_HCI_ANY_E_NOK;
 237                         goto exit;
 238                 }
 239
 240                 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
 241                 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
 242                 break;
 243         case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 244                 if (skb->len != 1) {
 245                         status = NFC_HCI_ANY_E_NOK;
 246                         goto exit;
 247                 }
 248                 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
 249
 250                 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
 251                 break;
 252         default:
 253                 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 254                 break;
 255         }
 256
 257         if (hdev->ops->cmd_received)
 258                 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
 259
 260 exit:
 261         nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
 262                                status, NULL, 0, NULL, NULL, 0);
 263
 264         kfree_skb(skb);
 265 }
 266
 267 u32 nfc_hci_sak_to_protocol(u8 sak)
 268 {
 269         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
 270         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
 271                 return NFC_PROTO_MIFARE_MASK;
 272         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
 273                 return NFC_PROTO_ISO14443_MASK;
 274         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
 275                 return NFC_PROTO_NFC_DEP_MASK;
 276         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
 277                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
 278         default:
 279                 return 0xffffffff;
 280         }
 281 }
 282 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
 283
 284 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
 285 {
 286         struct nfc_target *targets;
 287         struct sk_buff *atqa_skb = NULL;
 288         struct sk_buff *sak_skb = NULL;
 289         struct sk_buff *uid_skb = NULL;
 290         int r;
 291
 292         pr_debug("from gate %d\n", gate);
 293
 294         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 295         if (targets == NULL)
 296                 return -ENOMEM;
 297
 298         switch (gate) {
 299         case NFC_HCI_RF_READER_A_GATE:
 300                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 301                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
 302                 if (r < 0)
 303                         goto exit;
 304
 305                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 306                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
 307                 if (r < 0)
 308                         goto exit;
 309
 310                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
 311                         r = -EPROTO;
 312                         goto exit;
 313                 }
 314
 315                 targets->supported_protocols =
 316                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
 317                 if (targets->supported_protocols == 0xffffffff) {
 318                         r = -EPROTO;
 319                         goto exit;
 320                 }
 321
 322                 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
 323                 targets->sel_res = sak_skb->data[0];
 324
 325                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 326                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
 327                 if (r < 0)
 328                         goto exit;
 329
 330                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 331                         r = -EPROTO;
 332                         goto exit;
 333                 }
 334
 335                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
 336                 targets->nfcid1_len = uid_skb->len;
 337
 338                 if (hdev->ops->complete_target_discovered) {
 339                         r = hdev->ops->complete_target_discovered(hdev, gate,
 340                                                                   targets);
 341                         if (r < 0)
 342                                 goto exit;
 343                 }
 344                 break;
 345         case NFC_HCI_RF_READER_B_GATE:
 346                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 347                 break;
 348         default:
 349                 if (hdev->ops->target_from_gate)
 350                         r = hdev->ops->target_from_gate(hdev, gate, targets);
 351                 else
 352                         r = -EPROTO;
 353                 if (r < 0)
 354                         goto exit;
 355
 356                 if (hdev->ops->complete_target_discovered) {
 357                         r = hdev->ops->complete_target_discovered(hdev, gate,
 358                                                                   targets);
 359                         if (r < 0)
 360                                 goto exit;
 361                 }
 362                 break;
 363         }
 364
 365         /* if driver set the new gate, we will skip the old one */
 366         if (targets->hci_reader_gate == 0x00)
 367                 targets->hci_reader_gate = gate;
 368
 369         r = nfc_targets_found(hdev->ndev, targets, 1);
 370
 371 exit:
 372         kfree(targets);
 373         kfree_skb(atqa_skb);
 374         kfree_skb(sak_skb);
 375         kfree_skb(uid_skb);
 376
 377         return r;
 378 }
 379 EXPORT_SYMBOL(nfc_hci_target_discovered);
 380
 381 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 382                             struct sk_buff *skb)
 383 {
 384         int r = 0;
 385         u8 gate;
 386
 387         if (pipe >= NFC_HCI_MAX_PIPES) {
 388                 pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
 389                 goto exit;
 390         }
 391
 392         gate = hdev->pipes[pipe].gate;
 393         if (gate == NFC_HCI_INVALID_GATE) {
 394                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
 395                 goto exit;
 396         }
 397
 398         if (hdev->ops->event_received) {
 399                 r = hdev->ops->event_received(hdev, pipe, event, skb);
 400                 if (r <= 0)
 401                         goto exit_noskb;
 402         }
 403
 404         switch (event) {
 405         case NFC_HCI_EVT_TARGET_DISCOVERED:
 406                 if (skb->len < 1) {     /* no status data? */
 407                         r = -EPROTO;
 408                         goto exit;
 409                 }
 410
 411                 if (skb->data[0] == 3) {
 412                         /* TODO: Multiple targets in field, none activated
 413                          * poll is supposedly stopped, but there is no
 414                          * single target to activate, so nothing to report
 415                          * up.
 416                          * if we need to restart poll, we must save the
 417                          * protocols from the initial poll and reuse here.
 418                          */
 419                 }
 420
 421                 if (skb->data[0] != 0) {
 422                         r = -EPROTO;
 423                         goto exit;
 424                 }
 425
 426                 r = nfc_hci_target_discovered(hdev, gate);
 427                 break;
 428         default:
 429                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
 430                 r = -EINVAL;
 431                 break;
 432         }
 433
 434 exit:
 435         kfree_skb(skb);
 436
 437 exit_noskb:
 438         if (r)
 439                 nfc_hci_driver_failure(hdev, r);
 440 }
 441
 442 static void nfc_hci_cmd_timeout(struct timer_list *t)
 443 {
 444         struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
 445
 446         schedule_work(&hdev->msg_tx_work);
 447 }
 448
 449 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 450                                  struct nfc_hci_gate *gates)
 451 {
 452         int r;
 453         while (gate_count--) {
 454                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 455                                          gates->gate, gates->pipe);
 456                 if (r < 0)
 457                         return r;
 458                 gates++;
 459         }
 460
 461         return 0;
 462 }
 463
 464 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 465 {
 466         struct sk_buff *skb = NULL;
 467         int r;
 468
 469         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 470                 return -EPROTO;
 471
 472         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 473                                  hdev->init_data.gates[0].gate,
 474                                  hdev->init_data.gates[0].pipe);
 475         if (r < 0)
 476                 goto exit;
 477
 478         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 479                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 480         if (r < 0)
 481                 goto disconnect_all;
 482
 483         if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
 484                 (memcmp(hdev->init_data.session_id, skb->data,
 485                            skb->len) == 0) && hdev->ops->load_session) {
 486                 /* Restore gate<->pipe table from some proprietary location. */
 487
 488                 r = hdev->ops->load_session(hdev);
 489
 490                 if (r < 0)
 491                         goto disconnect_all;
 492         } else {
 493
 494                 r = nfc_hci_disconnect_all_gates(hdev);
 495                 if (r < 0)
 496                         goto exit;
 497
 498                 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 499                                           hdev->init_data.gates);
 500                 if (r < 0)
 501                         goto disconnect_all;
 502
 503                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 504                                 NFC_HCI_ADMIN_SESSION_IDENTITY,
 505                                 hdev->init_data.session_id,
 506                                 strlen(hdev->init_data.session_id));
 507         }
 508         if (r == 0)
 509                 goto exit;
 510
 511 disconnect_all:
 512         nfc_hci_disconnect_all_gates(hdev);
 513
 514 exit:
 515         kfree_skb(skb);
 516
 517         return r;
 518 }
 519
 520 static int hci_dev_version(struct nfc_hci_dev *hdev)
 521 {
 522         int r;
 523         struct sk_buff *skb;
 524
 525         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 526                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 527         if (r == -EOPNOTSUPP) {
 528                 pr_info("Software/Hardware info not available\n");
 529                 return 0;
 530         }
 531         if (r < 0)
 532                 return r;
 533
 534         if (skb->len != 3) {
 535                 kfree_skb(skb);
 536                 return -EINVAL;
 537         }
 538
 539         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 540         hdev->sw_patch = skb->data[0] & 0x0f;
 541         hdev->sw_flashlib_major = skb->data[1];
 542         hdev->sw_flashlib_minor = skb->data[2];
 543
 544         kfree_skb(skb);
 545
 546         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 547                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 548         if (r < 0)
 549                 return r;
 550
 551         if (skb->len != 3) {
 552                 kfree_skb(skb);
 553                 return -EINVAL;
 554         }
 555
 556         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 557         hdev->hw_version = skb->data[0] & 0x1f;
 558         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 559         hdev->hw_software = skb->data[1] & 0x3f;
 560         hdev->hw_bsid = skb->data[2];
 561
 562         kfree_skb(skb);
 563
 564         pr_info("SOFTWARE INFO:\n");
 565         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 566         pr_info("Patch          : %d\n", hdev->sw_patch);
 567         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 568         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 569         pr_info("HARDWARE INFO:\n");
 570         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 571         pr_info("HW Version     : %d\n", hdev->hw_version);
 572         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 573         pr_info("Software       : %d\n", hdev->hw_software);
 574         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 575
 576         return 0;
 577 }
 578
 579 static int hci_dev_up(struct nfc_dev *nfc_dev)
 580 {
 581         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 582         int r = 0;
 583
 584         if (hdev->ops->open) {
 585                 r = hdev->ops->open(hdev);
 586                 if (r < 0)
 587                         return r;
 588         }
 589
 590         r = nfc_llc_start(hdev->llc);
 591         if (r < 0)
 592                 goto exit_close;
 593
 594         r = hci_dev_session_init(hdev);
 595         if (r < 0)
 596                 goto exit_llc;
 597
 598         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 599                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 600         if (r < 0)
 601                 goto exit_llc;
 602
 603         if (hdev->ops->hci_ready) {
 604                 r = hdev->ops->hci_ready(hdev);
 605                 if (r < 0)
 606                         goto exit_llc;
 607         }
 608
 609         r = hci_dev_version(hdev);
 610         if (r < 0)
 611                 goto exit_llc;
 612
 613         return 0;
 614
 615 exit_llc:
 616         nfc_llc_stop(hdev->llc);
 617
 618 exit_close:
 619         if (hdev->ops->close)
 620                 hdev->ops->close(hdev);
 621
 622         return r;
 623 }
 624
 625 static int hci_dev_down(struct nfc_dev *nfc_dev)
 626 {
 627         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 628
 629         nfc_llc_stop(hdev->llc);
 630
 631         if (hdev->ops->close)
 632                 hdev->ops->close(hdev);
 633
 634         nfc_hci_reset_pipes(hdev);
 635
 636         return 0;
 637 }
 638
 639 static int hci_start_poll(struct nfc_dev *nfc_dev,
 640                           u32 im_protocols, u32 tm_protocols)
 641 {
 642         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 643
 644         if (hdev->ops->start_poll)
 645                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 646         else
 647                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 648                                           NFC_HCI_EVT_READER_REQUESTED,
 649                                           NULL, 0);
 650 }
 651
 652 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 653 {
 654         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 655
 656         if (hdev->ops->stop_poll)
 657                 hdev->ops->stop_poll(hdev);
 658         else
 659                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 660                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
 661 }
 662
 663 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 664                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 665 {
 666         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 667
 668         if (!hdev->ops->dep_link_up)
 669                 return 0;
 670
 671         return hdev->ops->dep_link_up(hdev, target, comm_mode,
 672                                       gb, gb_len);
 673 }
 674
 675 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 676 {
 677         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 678
 679         if (!hdev->ops->dep_link_down)
 680                 return 0;
 681
 682         return hdev->ops->dep_link_down(hdev);
 683 }
 684
 685 static int hci_activate_target(struct nfc_dev *nfc_dev,
 686                                struct nfc_target *target, u32 protocol)
 687 {
 688         return 0;
 689 }
 690
 691 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 692                                   struct nfc_target *target,
 693                                   u8 mode)
 694 {
 695 }
 696
 697 #define HCI_CB_TYPE_TRANSCEIVE 1
 698
 699 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 700 {
 701         struct nfc_hci_dev *hdev = context;
 702
 703         switch (hdev->async_cb_type) {
 704         case HCI_CB_TYPE_TRANSCEIVE:
 705                 /*
 706                  * TODO: Check RF Error indicator to make sure data is valid.
 707                  * It seems that HCI cmd can complete without error, but data
 708                  * can be invalid if an RF error occured? Ignore for now.
 709                  */
 710                 if (err == 0)
 711                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 712
 713                 hdev->async_cb(hdev->async_cb_context, skb, err);
 714                 break;
 715         default:
 716                 if (err == 0)
 717                         kfree_skb(skb);
 718                 break;
 719         }
 720 }
 721
 722 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 723                           struct sk_buff *skb, data_exchange_cb_t cb,
 724                           void *cb_context)
 725 {
 726         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 727         int r;
 728
 729         pr_debug("target_idx=%d\n", target->idx);
 730
 731         switch (target->hci_reader_gate) {
 732         case NFC_HCI_RF_READER_A_GATE:
 733         case NFC_HCI_RF_READER_B_GATE:
 734                 if (hdev->ops->im_transceive) {
 735                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 736                                                      cb_context);
 737                         if (r <= 0)     /* handled */
 738                                 break;
 739                 }
 740
 741                 *(u8 *)skb_push(skb, 1) = 0;    /* CTR, see spec:10.2.2.1 */
 742
 743                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 744                 hdev->async_cb = cb;
 745                 hdev->async_cb_context = cb_context;
 746
 747                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 748                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 749                                            skb->len, hci_transceive_cb, hdev);
 750                 break;
 751         default:
 752                 if (hdev->ops->im_transceive) {
 753                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 754                                                      cb_context);
 755                         if (r == 1)
 756                                 r = -ENOTSUPP;
 757                 } else {
 758                         r = -ENOTSUPP;
 759                 }
 760                 break;
 761         }
 762
 763         kfree_skb(skb);
 764
 765         return r;
 766 }
 767
 768 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 769 {
 770         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 771
 772         if (!hdev->ops->tm_send) {
 773                 kfree_skb(skb);
 774                 return -ENOTSUPP;
 775         }
 776
 777         return hdev->ops->tm_send(hdev, skb);
 778 }
 779
 780 static int hci_check_presence(struct nfc_dev *nfc_dev,
 781                               struct nfc_target *target)
 782 {
 783         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 784
 785         if (!hdev->ops->check_presence)
 786                 return 0;
 787
 788         return hdev->ops->check_presence(hdev, target);
 789 }
 790
 791 static int hci_discover_se(struct nfc_dev *nfc_dev)
 792 {
 793         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 794
 795         if (hdev->ops->discover_se)
 796                 return hdev->ops->discover_se(hdev);
 797
 798         return 0;
 799 }
 800
 801 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 802 {
 803         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 804
 805         if (hdev->ops->enable_se)
 806                 return hdev->ops->enable_se(hdev, se_idx);
 807
 808         return 0;
 809 }
 810
 811 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 812 {
 813         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 814
 815         if (hdev->ops->disable_se)
 816                 return hdev->ops->disable_se(hdev, se_idx);
 817
 818         return 0;
 819 }
 820
 821 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
 822                      u8 *apdu, size_t apdu_length,
 823                      se_io_cb_t cb, void *cb_context)
 824 {
 825         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 826
 827         if (hdev->ops->se_io)
 828                 return hdev->ops->se_io(hdev, se_idx, apdu,
 829                                         apdu_length, cb, cb_context);
 830
 831         return 0;
 832 }
 833
 834 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 835 {
 836         mutex_lock(&hdev->msg_tx_mutex);
 837
 838         if (hdev->cmd_pending_msg == NULL) {
 839                 nfc_driver_failure(hdev->ndev, err);
 840                 goto exit;
 841         }
 842
 843         __nfc_hci_cmd_completion(hdev, err, NULL);
 844
 845 exit:
 846         mutex_unlock(&hdev->msg_tx_mutex);
 847 }
 848
 849 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 850 {
 851         nfc_hci_failure(hdev, err);
 852 }
 853
 854 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 855 {
 856         struct hcp_packet *packet;
 857         u8 type;
 858         u8 instruction;
 859         struct sk_buff *hcp_skb;
 860         u8 pipe;
 861         struct sk_buff *frag_skb;
 862         int msg_len;
 863
 864         packet = (struct hcp_packet *)skb->data;
 865         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 866                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 867                 return;
 868         }
 869
 870         /* it's the last fragment. Does it need re-aggregation? */
 871         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 872                 pipe = packet->header & NFC_HCI_FRAGMENT;
 873                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 874
 875                 msg_len = 0;
 876                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 877                         msg_len += (frag_skb->len -
 878                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 879                 }
 880
 881                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 882                                              msg_len, GFP_KERNEL);
 883                 if (hcp_skb == NULL) {
 884                         nfc_hci_failure(hdev, -ENOMEM);
 885                         return;
 886                 }
 887
 888                 skb_put_u8(hcp_skb, pipe);
 889
 890                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 891                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 892                         skb_put_data(hcp_skb,
 893                                      frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 894                                      msg_len);
 895                 }
 896
 897                 skb_queue_purge(&hdev->rx_hcp_frags);
 898         } else {
 899                 packet->header &= NFC_HCI_FRAGMENT;
 900                 hcp_skb = skb;
 901         }
 902
 903         /* if this is a response, dispatch immediately to
 904          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 905          * in separate context where handler can also execute command.
 906          */
 907         packet = (struct hcp_packet *)hcp_skb->data;
 908         type = HCP_MSG_GET_TYPE(packet->message.header);
 909         if (type == NFC_HCI_HCP_RESPONSE) {
 910                 pipe = packet->header;
 911                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 912                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 913                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 914                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 915         } else {
 916                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 917                 schedule_work(&hdev->msg_rx_work);
 918         }
 919 }
 920
 921 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
 922 {
 923         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 924
 925         if (!hdev->ops->fw_download)
 926                 return -ENOTSUPP;
 927
 928         return hdev->ops->fw_download(hdev, firmware_name);
 929 }
 930
 931 static struct nfc_ops hci_nfc_ops = {
 932         .dev_up = hci_dev_up,
 933         .dev_down = hci_dev_down,
 934         .start_poll = hci_start_poll,
 935         .stop_poll = hci_stop_poll,
 936         .dep_link_up = hci_dep_link_up,
 937         .dep_link_down = hci_dep_link_down,
 938         .activate_target = hci_activate_target,
 939         .deactivate_target = hci_deactivate_target,
 940         .im_transceive = hci_transceive,
 941         .tm_send = hci_tm_send,
 942         .check_presence = hci_check_presence,
 943         .fw_download = hci_fw_download,
 944         .discover_se = hci_discover_se,
 945         .enable_se = hci_enable_se,
 946         .disable_se = hci_disable_se,
 947         .se_io = hci_se_io,
 948 };
 949
 950 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 951                                             struct nfc_hci_init_data *init_data,
 952                                             unsigned long quirks,
 953                                             u32 protocols,
 954                                             const char *llc_name,
 955                                             int tx_headroom,
 956                                             int tx_tailroom,
 957                                             int max_link_payload)
 958 {
 959         struct nfc_hci_dev *hdev;
 960
 961         if (ops->xmit == NULL)
 962                 return NULL;
 963
 964         if (protocols == 0)
 965                 return NULL;
 966
 967         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 968         if (hdev == NULL)
 969                 return NULL;
 970
 971         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 972                                      nfc_hci_recv_from_llc, tx_headroom,
 973                                      tx_tailroom, nfc_hci_llc_failure);
 974         if (hdev->llc == NULL) {
 975                 kfree(hdev);
 976                 return NULL;
 977         }
 978
 979         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 980                                          tx_headroom + HCI_CMDS_HEADROOM,
 981                                          tx_tailroom);
 982         if (!hdev->ndev) {
 983                 nfc_llc_free(hdev->llc);
 984                 kfree(hdev);
 985                 return NULL;
 986         }
 987
 988         hdev->ops = ops;
 989         hdev->max_data_link_payload = max_link_payload;
 990         hdev->init_data = *init_data;
 991
 992         nfc_set_drvdata(hdev->ndev, hdev);
 993
 994         nfc_hci_reset_pipes(hdev);
 995
 996         hdev->quirks = quirks;
 997
 998         return hdev;
 999 }
1000 EXPORT_SYMBOL(nfc_hci_allocate_device);
1001
1002 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1003 {
1004         nfc_free_device(hdev->ndev);
1005         nfc_llc_free(hdev->llc);
1006         kfree(hdev);
1007 }
1008 EXPORT_SYMBOL(nfc_hci_free_device);
1009
1010 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1011 {
1012         mutex_init(&hdev->msg_tx_mutex);
1013
1014         INIT_LIST_HEAD(&hdev->msg_tx_queue);
1015
1016         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1017
1018         timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1019
1020         skb_queue_head_init(&hdev->rx_hcp_frags);
1021
1022         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1023
1024         skb_queue_head_init(&hdev->msg_rx_queue);
1025
1026         return nfc_register_device(hdev->ndev);
1027 }
1028 EXPORT_SYMBOL(nfc_hci_register_device);
1029
1030 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1031 {
1032         struct hci_msg *msg, *n;
1033
1034         mutex_lock(&hdev->msg_tx_mutex);
1035
1036         if (hdev->cmd_pending_msg) {
1037                 if (hdev->cmd_pending_msg->cb)
1038                         hdev->cmd_pending_msg->cb(
1039                                              hdev->cmd_pending_msg->cb_context,
1040                                              NULL, -ESHUTDOWN);
1041                 kfree(hdev->cmd_pending_msg);
1042                 hdev->cmd_pending_msg = NULL;
1043         }
1044
1045         hdev->shutting_down = true;
1046
1047         mutex_unlock(&hdev->msg_tx_mutex);
1048
1049         del_timer_sync(&hdev->cmd_timer);
1050         cancel_work_sync(&hdev->msg_tx_work);
1051
1052         cancel_work_sync(&hdev->msg_rx_work);
1053
1054         nfc_unregister_device(hdev->ndev);
1055
1056         skb_queue_purge(&hdev->rx_hcp_frags);
1057         skb_queue_purge(&hdev->msg_rx_queue);
1058
1059         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1060                 list_del(&msg->msg_l);
1061                 skb_queue_purge(&msg->msg_frags);
1062                 kfree(msg);
1063         }
1064 }
1065 EXPORT_SYMBOL(nfc_hci_unregister_device);
1066
1067 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1068 {
1069         hdev->clientdata = clientdata;
1070 }
1071 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1072
1073 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1074 {
1075         return hdev->clientdata;
1076 }
1077 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1078
1079 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1080 {
1081         nfc_hci_failure(hdev, err);
1082 }
1083 EXPORT_SYMBOL(nfc_hci_driver_failure);
1084
1085 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1086 {
1087         nfc_llc_rcv_from_drv(hdev->llc, skb);
1088 }
1089 EXPORT_SYMBOL(nfc_hci_recv_frame);
1090
1091 static int __init nfc_hci_init(void)
1092 {
1093         return nfc_llc_init();
1094 }
1095
1096 static void __exit nfc_hci_exit(void)
1097 {
1098         nfc_llc_exit();
1099 }
1100
1101 subsys_initcall(nfc_hci_init);
1102 module_exit(nfc_hci_exit);
1103
1104 MODULE_LICENSE("GPL");
1105 MODULE_DESCRIPTION("NFC HCI Core");