net/nfc/hci/core.c

   1 /*
   2  * Copyright (C) 2012  Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the
  16  * Free Software Foundation, Inc.,
  17  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
  21
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/nfc.h>
  26
  27 #include <net/nfc/nfc.h>
  28 #include <net/nfc/hci.h>
  29 #include <net/nfc/llc.h>
  30
  31 #include "hci.h"
  32
  33 /* Largest headroom needed for outgoing HCI commands */
  34 #define HCI_CMDS_HEADROOM 1
  35
  36 int nfc_hci_result_to_errno(u8 result)
  37 {
  38         switch (result) {
  39         case NFC_HCI_ANY_OK:
  40                 return 0;
  41         case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
  42                 return -EOPNOTSUPP;
  43         case NFC_HCI_ANY_E_TIMEOUT:
  44                 return -ETIME;
  45         default:
  46                 return -1;
  47         }
  48 }
  49 EXPORT_SYMBOL(nfc_hci_result_to_errno);
  50
  51 static void nfc_hci_msg_tx_work(struct work_struct *work)
  52 {
  53         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
  54                                                 msg_tx_work);
  55         struct hci_msg *msg;
  56         struct sk_buff *skb;
  57         int r = 0;
  58
  59         mutex_lock(&hdev->msg_tx_mutex);
  60         if (hdev->shutting_down)
  61                 goto exit;
  62
  63         if (hdev->cmd_pending_msg) {
  64                 if (timer_pending(&hdev->cmd_timer) == 0) {
  65                         if (hdev->cmd_pending_msg->cb)
  66                                 hdev->cmd_pending_msg->cb(hdev->
  67                                                           cmd_pending_msg->
  68                                                           cb_context,
  69                                                           NULL,
  70                                                           -ETIME);
  71                         kfree(hdev->cmd_pending_msg);
  72                         hdev->cmd_pending_msg = NULL;
  73                 } else {
  74                         goto exit;
  75                 }
  76         }
  77
  78 next_msg:
  79         if (list_empty(&hdev->msg_tx_queue))
  80                 goto exit;
  81
  82         msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
  83         list_del(&msg->msg_l);
  84
  85         pr_debug("msg_tx_queue has a cmd to send\n");
  86         while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
  87                 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
  88                 if (r < 0) {
  89                         kfree_skb(skb);
  90                         skb_queue_purge(&msg->msg_frags);
  91                         if (msg->cb)
  92                                 msg->cb(msg->cb_context, NULL, r);
  93                         kfree(msg);
  94                         break;
  95                 }
  96         }
  97
  98         if (r)
  99                 goto next_msg;
 100
 101         if (msg->wait_response == false) {
 102                 kfree(msg);
 103                 goto next_msg;
 104         }
 105
 106         hdev->cmd_pending_msg = msg;
 107         mod_timer(&hdev->cmd_timer, jiffies +
 108                   msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
 109
 110 exit:
 111         mutex_unlock(&hdev->msg_tx_mutex);
 112 }
 113
 114 static void nfc_hci_msg_rx_work(struct work_struct *work)
 115 {
 116         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 117                                                 msg_rx_work);
 118         struct sk_buff *skb;
 119         struct hcp_message *message;
 120         u8 pipe;
 121         u8 type;
 122         u8 instruction;
 123
 124         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 125                 pipe = skb->data[0];
 126                 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
 127                 message = (struct hcp_message *)skb->data;
 128                 type = HCP_MSG_GET_TYPE(message->header);
 129                 instruction = HCP_MSG_GET_CMD(message->header);
 130                 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 131
 132                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
 133         }
 134 }
 135
 136 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
 137                                      struct sk_buff *skb)
 138 {
 139         del_timer_sync(&hdev->cmd_timer);
 140
 141         if (hdev->cmd_pending_msg->cb)
 142                 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
 143                                           skb, err);
 144         else
 145                 kfree_skb(skb);
 146
 147         kfree(hdev->cmd_pending_msg);
 148         hdev->cmd_pending_msg = NULL;
 149
 150         schedule_work(&hdev->msg_tx_work);
 151 }
 152
 153 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
 154                            struct sk_buff *skb)
 155 {
 156         mutex_lock(&hdev->msg_tx_mutex);
 157
 158         if (hdev->cmd_pending_msg == NULL) {
 159                 kfree_skb(skb);
 160                 goto exit;
 161         }
 162
 163         __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
 164
 165 exit:
 166         mutex_unlock(&hdev->msg_tx_mutex);
 167 }
 168
 169 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 170                           struct sk_buff *skb)
 171 {
 172         kfree_skb(skb);
 173 }
 174
 175 u32 nfc_hci_sak_to_protocol(u8 sak)
 176 {
 177         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
 178         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
 179                 return NFC_PROTO_MIFARE_MASK;
 180         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
 181                 return NFC_PROTO_ISO14443_MASK;
 182         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
 183                 return NFC_PROTO_NFC_DEP_MASK;
 184         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
 185                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
 186         default:
 187                 return 0xffffffff;
 188         }
 189 }
 190 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
 191
 192 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
 193 {
 194         struct nfc_target *targets;
 195         struct sk_buff *atqa_skb = NULL;
 196         struct sk_buff *sak_skb = NULL;
 197         struct sk_buff *uid_skb = NULL;
 198         int r;
 199
 200         pr_debug("from gate %d\n", gate);
 201
 202         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 203         if (targets == NULL)
 204                 return -ENOMEM;
 205
 206         switch (gate) {
 207         case NFC_HCI_RF_READER_A_GATE:
 208                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 209                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
 210                 if (r < 0)
 211                         goto exit;
 212
 213                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 214                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
 215                 if (r < 0)
 216                         goto exit;
 217
 218                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
 219                         r = -EPROTO;
 220                         goto exit;
 221                 }
 222
 223                 targets->supported_protocols =
 224                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
 225                 if (targets->supported_protocols == 0xffffffff) {
 226                         r = -EPROTO;
 227                         goto exit;
 228                 }
 229
 230                 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
 231                 targets->sel_res = sak_skb->data[0];
 232
 233                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 234                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
 235                 if (r < 0)
 236                         goto exit;
 237
 238                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 239                         r = -EPROTO;
 240                         goto exit;
 241                 }
 242
 243                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
 244                 targets->nfcid1_len = uid_skb->len;
 245
 246                 if (hdev->ops->complete_target_discovered) {
 247                         r = hdev->ops->complete_target_discovered(hdev, gate,
 248                                                                   targets);
 249                         if (r < 0)
 250                                 goto exit;
 251                 }
 252                 break;
 253         case NFC_HCI_RF_READER_B_GATE:
 254                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 255                 break;
 256         default:
 257                 if (hdev->ops->target_from_gate)
 258                         r = hdev->ops->target_from_gate(hdev, gate, targets);
 259                 else
 260                         r = -EPROTO;
 261                 if (r < 0)
 262                         goto exit;
 263
 264                 if (hdev->ops->complete_target_discovered) {
 265                         r = hdev->ops->complete_target_discovered(hdev, gate,
 266                                                                   targets);
 267                         if (r < 0)
 268                                 goto exit;
 269                 }
 270                 break;
 271         }
 272
 273         /* if driver set the new gate, we will skip the old one */
 274         if (targets->hci_reader_gate == 0x00)
 275                 targets->hci_reader_gate = gate;
 276
 277         r = nfc_targets_found(hdev->ndev, targets, 1);
 278
 279 exit:
 280         kfree(targets);
 281         kfree_skb(atqa_skb);
 282         kfree_skb(sak_skb);
 283         kfree_skb(uid_skb);
 284
 285         return r;
 286 }
 287 EXPORT_SYMBOL(nfc_hci_target_discovered);
 288
 289 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 290                             struct sk_buff *skb)
 291 {
 292         int r = 0;
 293         u8 gate = nfc_hci_pipe2gate(hdev, pipe);
 294
 295         if (gate == 0xff) {
 296                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
 297                 goto exit;
 298         }
 299
 300         if (hdev->ops->event_received) {
 301                 r = hdev->ops->event_received(hdev, gate, event, skb);
 302                 if (r <= 0)
 303                         goto exit_noskb;
 304         }
 305
 306         switch (event) {
 307         case NFC_HCI_EVT_TARGET_DISCOVERED:
 308                 if (skb->len < 1) {     /* no status data? */
 309                         r = -EPROTO;
 310                         goto exit;
 311                 }
 312
 313                 if (skb->data[0] == 3) {
 314                         /* TODO: Multiple targets in field, none activated
 315                          * poll is supposedly stopped, but there is no
 316                          * single target to activate, so nothing to report
 317                          * up.
 318                          * if we need to restart poll, we must save the
 319                          * protocols from the initial poll and reuse here.
 320                          */
 321                 }
 322
 323                 if (skb->data[0] != 0) {
 324                         r = -EPROTO;
 325                         goto exit;
 326                 }
 327
 328                 r = nfc_hci_target_discovered(hdev, gate);
 329                 break;
 330         default:
 331                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
 332                 r = -EINVAL;
 333                 break;
 334         }
 335
 336 exit:
 337         kfree_skb(skb);
 338
 339 exit_noskb:
 340         if (r) {
 341                 /* TODO: There was an error dispatching the event,
 342                  * how to propagate up to nfc core?
 343                  */
 344         }
 345 }
 346
 347 static void nfc_hci_cmd_timeout(unsigned long data)
 348 {
 349         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
 350
 351         schedule_work(&hdev->msg_tx_work);
 352 }
 353
 354 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 355                                  struct nfc_hci_gate *gates)
 356 {
 357         int r;
 358         while (gate_count--) {
 359                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 360                                          gates->gate, gates->pipe);
 361                 if (r < 0)
 362                         return r;
 363                 gates++;
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 370 {
 371         struct sk_buff *skb = NULL;
 372         int r;
 373
 374         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 375                 return -EPROTO;
 376
 377         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 378                                  hdev->init_data.gates[0].gate,
 379                                  hdev->init_data.gates[0].pipe);
 380         if (r < 0)
 381                 goto exit;
 382
 383         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 384                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 385         if (r < 0)
 386                 goto disconnect_all;
 387
 388         if (skb->len && skb->len == strlen(hdev->init_data.session_id))
 389                 if (memcmp(hdev->init_data.session_id, skb->data,
 390                            skb->len) == 0) {
 391                         /* TODO ELa: restore gate<->pipe table from
 392                          * some TBD location.
 393                          * note: it doesn't seem possible to get the chip
 394                          * currently open gate/pipe table.
 395                          * It is only possible to obtain the supported
 396                          * gate list.
 397                          */
 398
 399                         /* goto exit
 400                          * For now, always do a full initialization */
 401                 }
 402
 403         r = nfc_hci_disconnect_all_gates(hdev);
 404         if (r < 0)
 405                 goto exit;
 406
 407         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 408                                   hdev->init_data.gates);
 409         if (r < 0)
 410                 goto disconnect_all;
 411
 412         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 413                               NFC_HCI_ADMIN_SESSION_IDENTITY,
 414                               hdev->init_data.session_id,
 415                               strlen(hdev->init_data.session_id));
 416         if (r == 0)
 417                 goto exit;
 418
 419 disconnect_all:
 420         nfc_hci_disconnect_all_gates(hdev);
 421
 422 exit:
 423         kfree_skb(skb);
 424
 425         return r;
 426 }
 427
 428 static int hci_dev_version(struct nfc_hci_dev *hdev)
 429 {
 430         int r;
 431         struct sk_buff *skb;
 432
 433         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 434                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 435         if (r == -EOPNOTSUPP) {
 436                 pr_info("Software/Hardware info not available\n");
 437                 return 0;
 438         }
 439         if (r < 0)
 440                 return r;
 441
 442         if (skb->len != 3) {
 443                 kfree_skb(skb);
 444                 return -EINVAL;
 445         }
 446
 447         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 448         hdev->sw_patch = skb->data[0] & 0x0f;
 449         hdev->sw_flashlib_major = skb->data[1];
 450         hdev->sw_flashlib_minor = skb->data[2];
 451
 452         kfree_skb(skb);
 453
 454         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 455                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 456         if (r < 0)
 457                 return r;
 458
 459         if (skb->len != 3) {
 460                 kfree_skb(skb);
 461                 return -EINVAL;
 462         }
 463
 464         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 465         hdev->hw_version = skb->data[0] & 0x1f;
 466         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 467         hdev->hw_software = skb->data[1] & 0x3f;
 468         hdev->hw_bsid = skb->data[2];
 469
 470         kfree_skb(skb);
 471
 472         pr_info("SOFTWARE INFO:\n");
 473         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 474         pr_info("Patch          : %d\n", hdev->sw_patch);
 475         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 476         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 477         pr_info("HARDWARE INFO:\n");
 478         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 479         pr_info("HW Version     : %d\n", hdev->hw_version);
 480         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 481         pr_info("Software       : %d\n", hdev->hw_software);
 482         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 483
 484         return 0;
 485 }
 486
 487 static int hci_dev_up(struct nfc_dev *nfc_dev)
 488 {
 489         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 490         int r = 0;
 491
 492         if (hdev->ops->open) {
 493                 r = hdev->ops->open(hdev);
 494                 if (r < 0)
 495                         return r;
 496         }
 497
 498         r = nfc_llc_start(hdev->llc);
 499         if (r < 0)
 500                 goto exit_close;
 501
 502         r = hci_dev_session_init(hdev);
 503         if (r < 0)
 504                 goto exit_llc;
 505
 506         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 507                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 508         if (r < 0)
 509                 goto exit_llc;
 510
 511         if (hdev->ops->hci_ready) {
 512                 r = hdev->ops->hci_ready(hdev);
 513                 if (r < 0)
 514                         goto exit_llc;
 515         }
 516
 517         r = hci_dev_version(hdev);
 518         if (r < 0)
 519                 goto exit_llc;
 520
 521         return 0;
 522
 523 exit_llc:
 524         nfc_llc_stop(hdev->llc);
 525
 526 exit_close:
 527         if (hdev->ops->close)
 528                 hdev->ops->close(hdev);
 529
 530         return r;
 531 }
 532
 533 static int hci_dev_down(struct nfc_dev *nfc_dev)
 534 {
 535         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 536
 537         nfc_llc_stop(hdev->llc);
 538
 539         if (hdev->ops->close)
 540                 hdev->ops->close(hdev);
 541
 542         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 543
 544         return 0;
 545 }
 546
 547 static int hci_start_poll(struct nfc_dev *nfc_dev,
 548                           u32 im_protocols, u32 tm_protocols)
 549 {
 550         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 551
 552         if (hdev->ops->start_poll)
 553                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 554         else
 555                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 556                                           NFC_HCI_EVT_READER_REQUESTED,
 557                                           NULL, 0);
 558 }
 559
 560 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 561 {
 562         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 563
 564         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 565                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 566 }
 567
 568 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 569                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 570 {
 571         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 572
 573         if (hdev->ops->dep_link_up)
 574                 return hdev->ops->dep_link_up(hdev, target, comm_mode,
 575                                                 gb, gb_len);
 576
 577         return 0;
 578 }
 579
 580 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 581 {
 582         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 583
 584         if (hdev->ops->dep_link_down)
 585                 return hdev->ops->dep_link_down(hdev);
 586
 587         return 0;
 588 }
 589
 590 static int hci_activate_target(struct nfc_dev *nfc_dev,
 591                                struct nfc_target *target, u32 protocol)
 592 {
 593         return 0;
 594 }
 595
 596 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 597                                   struct nfc_target *target)
 598 {
 599 }
 600
 601 #define HCI_CB_TYPE_TRANSCEIVE 1
 602
 603 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 604 {
 605         struct nfc_hci_dev *hdev = context;
 606
 607         switch (hdev->async_cb_type) {
 608         case HCI_CB_TYPE_TRANSCEIVE:
 609                 /*
 610                  * TODO: Check RF Error indicator to make sure data is valid.
 611                  * It seems that HCI cmd can complete without error, but data
 612                  * can be invalid if an RF error occured? Ignore for now.
 613                  */
 614                 if (err == 0)
 615                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 616
 617                 hdev->async_cb(hdev->async_cb_context, skb, err);
 618                 break;
 619         default:
 620                 if (err == 0)
 621                         kfree_skb(skb);
 622                 break;
 623         }
 624 }
 625
 626 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 627                           struct sk_buff *skb, data_exchange_cb_t cb,
 628                           void *cb_context)
 629 {
 630         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 631         int r;
 632
 633         pr_debug("target_idx=%d\n", target->idx);
 634
 635         switch (target->hci_reader_gate) {
 636         case NFC_HCI_RF_READER_A_GATE:
 637         case NFC_HCI_RF_READER_B_GATE:
 638                 if (hdev->ops->im_transceive) {
 639                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 640                                                      cb_context);
 641                         if (r <= 0)     /* handled */
 642                                 break;
 643                 }
 644
 645                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 646
 647                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 648                 hdev->async_cb = cb;
 649                 hdev->async_cb_context = cb_context;
 650
 651                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 652                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 653                                            skb->len, hci_transceive_cb, hdev);
 654                 break;
 655         default:
 656                 if (hdev->ops->im_transceive) {
 657                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 658                                                      cb_context);
 659                         if (r == 1)
 660                                 r = -ENOTSUPP;
 661                 } else {
 662                         r = -ENOTSUPP;
 663                 }
 664                 break;
 665         }
 666
 667         kfree_skb(skb);
 668
 669         return r;
 670 }
 671
 672 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 673 {
 674         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 675
 676         if (hdev->ops->tm_send)
 677                 return hdev->ops->tm_send(hdev, skb);
 678
 679         kfree_skb(skb);
 680
 681         return -ENOTSUPP;
 682 }
 683
 684 static int hci_check_presence(struct nfc_dev *nfc_dev,
 685                               struct nfc_target *target)
 686 {
 687         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 688
 689         if (hdev->ops->check_presence)
 690                 return hdev->ops->check_presence(hdev, target);
 691
 692         return 0;
 693 }
 694
 695 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 696 {
 697         mutex_lock(&hdev->msg_tx_mutex);
 698
 699         if (hdev->cmd_pending_msg == NULL) {
 700                 nfc_driver_failure(hdev->ndev, err);
 701                 goto exit;
 702         }
 703
 704         __nfc_hci_cmd_completion(hdev, err, NULL);
 705
 706 exit:
 707         mutex_unlock(&hdev->msg_tx_mutex);
 708 }
 709
 710 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 711 {
 712         nfc_hci_failure(hdev, err);
 713 }
 714
 715 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 716 {
 717         struct hcp_packet *packet;
 718         u8 type;
 719         u8 instruction;
 720         struct sk_buff *hcp_skb;
 721         u8 pipe;
 722         struct sk_buff *frag_skb;
 723         int msg_len;
 724
 725         packet = (struct hcp_packet *)skb->data;
 726         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 727                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 728                 return;
 729         }
 730
 731         /* it's the last fragment. Does it need re-aggregation? */
 732         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 733                 pipe = packet->header & NFC_HCI_FRAGMENT;
 734                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 735
 736                 msg_len = 0;
 737                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 738                         msg_len += (frag_skb->len -
 739                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 740                 }
 741
 742                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 743                                              msg_len, GFP_KERNEL);
 744                 if (hcp_skb == NULL) {
 745                         nfc_hci_failure(hdev, -ENOMEM);
 746                         return;
 747                 }
 748
 749                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 750
 751                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 752                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 753                         memcpy(skb_put(hcp_skb, msg_len),
 754                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 755                                msg_len);
 756                 }
 757
 758                 skb_queue_purge(&hdev->rx_hcp_frags);
 759         } else {
 760                 packet->header &= NFC_HCI_FRAGMENT;
 761                 hcp_skb = skb;
 762         }
 763
 764         /* if this is a response, dispatch immediately to
 765          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 766          * in separate context where handler can also execute command.
 767          */
 768         packet = (struct hcp_packet *)hcp_skb->data;
 769         type = HCP_MSG_GET_TYPE(packet->message.header);
 770         if (type == NFC_HCI_HCP_RESPONSE) {
 771                 pipe = packet->header;
 772                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 773                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 774                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 775                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 776         } else {
 777                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 778                 schedule_work(&hdev->msg_rx_work);
 779         }
 780 }
 781
 782 static struct nfc_ops hci_nfc_ops = {
 783         .dev_up = hci_dev_up,
 784         .dev_down = hci_dev_down,
 785         .start_poll = hci_start_poll,
 786         .stop_poll = hci_stop_poll,
 787         .dep_link_up = hci_dep_link_up,
 788         .dep_link_down = hci_dep_link_down,
 789         .activate_target = hci_activate_target,
 790         .deactivate_target = hci_deactivate_target,
 791         .im_transceive = hci_transceive,
 792         .tm_send = hci_tm_send,
 793         .check_presence = hci_check_presence,
 794 };
 795
 796 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 797                                             struct nfc_hci_init_data *init_data,
 798                                             unsigned long quirks,
 799                                             u32 protocols,
 800                                             u32 supported_se,
 801                                             const char *llc_name,
 802                                             int tx_headroom,
 803                                             int tx_tailroom,
 804                                             int max_link_payload)
 805 {
 806         struct nfc_hci_dev *hdev;
 807
 808         if (ops->xmit == NULL)
 809                 return NULL;
 810
 811         if (protocols == 0)
 812                 return NULL;
 813
 814         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 815         if (hdev == NULL)
 816                 return NULL;
 817
 818         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 819                                      nfc_hci_recv_from_llc, tx_headroom,
 820                                      tx_tailroom, nfc_hci_llc_failure);
 821         if (hdev->llc == NULL) {
 822                 kfree(hdev);
 823                 return NULL;
 824         }
 825
 826         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, supported_se,
 827                                          tx_headroom + HCI_CMDS_HEADROOM,
 828                                          tx_tailroom);
 829         if (!hdev->ndev) {
 830                 nfc_llc_free(hdev->llc);
 831                 kfree(hdev);
 832                 return NULL;
 833         }
 834
 835         hdev->ops = ops;
 836         hdev->max_data_link_payload = max_link_payload;
 837         hdev->init_data = *init_data;
 838
 839         nfc_set_drvdata(hdev->ndev, hdev);
 840
 841         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 842
 843         hdev->quirks = quirks;
 844
 845         return hdev;
 846 }
 847 EXPORT_SYMBOL(nfc_hci_allocate_device);
 848
 849 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 850 {
 851         nfc_free_device(hdev->ndev);
 852         nfc_llc_free(hdev->llc);
 853         kfree(hdev);
 854 }
 855 EXPORT_SYMBOL(nfc_hci_free_device);
 856
 857 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
 858 {
 859         mutex_init(&hdev->msg_tx_mutex);
 860
 861         INIT_LIST_HEAD(&hdev->msg_tx_queue);
 862
 863         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
 864
 865         init_timer(&hdev->cmd_timer);
 866         hdev->cmd_timer.data = (unsigned long)hdev;
 867         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
 868
 869         skb_queue_head_init(&hdev->rx_hcp_frags);
 870
 871         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
 872
 873         skb_queue_head_init(&hdev->msg_rx_queue);
 874
 875         return nfc_register_device(hdev->ndev);
 876 }
 877 EXPORT_SYMBOL(nfc_hci_register_device);
 878
 879 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
 880 {
 881         struct hci_msg *msg, *n;
 882
 883         mutex_lock(&hdev->msg_tx_mutex);
 884
 885         if (hdev->cmd_pending_msg) {
 886                 if (hdev->cmd_pending_msg->cb)
 887                         hdev->cmd_pending_msg->cb(
 888                                              hdev->cmd_pending_msg->cb_context,
 889                                              NULL, -ESHUTDOWN);
 890                 kfree(hdev->cmd_pending_msg);
 891                 hdev->cmd_pending_msg = NULL;
 892         }
 893
 894         hdev->shutting_down = true;
 895
 896         mutex_unlock(&hdev->msg_tx_mutex);
 897
 898         del_timer_sync(&hdev->cmd_timer);
 899         cancel_work_sync(&hdev->msg_tx_work);
 900
 901         cancel_work_sync(&hdev->msg_rx_work);
 902
 903         nfc_unregister_device(hdev->ndev);
 904
 905         skb_queue_purge(&hdev->rx_hcp_frags);
 906         skb_queue_purge(&hdev->msg_rx_queue);
 907
 908         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
 909                 list_del(&msg->msg_l);
 910                 skb_queue_purge(&msg->msg_frags);
 911                 kfree(msg);
 912         }
 913 }
 914 EXPORT_SYMBOL(nfc_hci_unregister_device);
 915
 916 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
 917 {
 918         hdev->clientdata = clientdata;
 919 }
 920 EXPORT_SYMBOL(nfc_hci_set_clientdata);
 921
 922 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
 923 {
 924         return hdev->clientdata;
 925 }
 926 EXPORT_SYMBOL(nfc_hci_get_clientdata);
 927
 928 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
 929 {
 930         nfc_hci_failure(hdev, err);
 931 }
 932 EXPORT_SYMBOL(nfc_hci_driver_failure);
 933
 934 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 935 {
 936         nfc_llc_rcv_from_drv(hdev->llc, skb);
 937 }
 938 EXPORT_SYMBOL(nfc_hci_recv_frame);
 939
 940 static int __init nfc_hci_init(void)
 941 {
 942         return nfc_llc_init();
 943 }
 944
 945 static void __exit nfc_hci_exit(void)
 946 {
 947         nfc_llc_exit();
 948 }
 949
 950 subsys_initcall(nfc_hci_init);
 951 module_exit(nfc_hci_exit);
 952
 953 MODULE_LICENSE("GPL");
 954 MODULE_DESCRIPTION("NFC HCI Core");