Pileus Git - ~andy/linux/blob - 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         switch (event) {
 301         case NFC_HCI_EVT_TARGET_DISCOVERED:
 302                 if (skb->len < 1) {     /* no status data? */
 303                         r = -EPROTO;
 304                         goto exit;
 305                 }
 306
 307                 if (skb->data[0] == 3) {
 308                         /* TODO: Multiple targets in field, none activated
 309                          * poll is supposedly stopped, but there is no
 310                          * single target to activate, so nothing to report
 311                          * up.
 312                          * if we need to restart poll, we must save the
 313                          * protocols from the initial poll and reuse here.
 314                          */
 315                 }
 316
 317                 if (skb->data[0] != 0) {
 318                         r = -EPROTO;
 319                         goto exit;
 320                 }
 321
 322                 r = nfc_hci_target_discovered(hdev, gate);
 323                 break;
 324         default:
 325                 if (hdev->ops->event_received) {
 326                         hdev->ops->event_received(hdev, gate, event, skb);
 327                         return;
 328                 }
 329
 330                 break;
 331         }
 332
 333 exit:
 334         kfree_skb(skb);
 335
 336         if (r) {
 337                 /* TODO: There was an error dispatching the event,
 338                  * how to propagate up to nfc core?
 339                  */
 340         }
 341 }
 342
 343 static void nfc_hci_cmd_timeout(unsigned long data)
 344 {
 345         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
 346
 347         schedule_work(&hdev->msg_tx_work);
 348 }
 349
 350 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 351                                  struct nfc_hci_gate *gates)
 352 {
 353         int r;
 354         while (gate_count--) {
 355                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 356                                          gates->gate, gates->pipe);
 357                 if (r < 0)
 358                         return r;
 359                 gates++;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 366 {
 367         struct sk_buff *skb = NULL;
 368         int r;
 369
 370         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 371                 return -EPROTO;
 372
 373         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 374                                  hdev->init_data.gates[0].gate,
 375                                  hdev->init_data.gates[0].pipe);
 376         if (r < 0)
 377                 goto exit;
 378
 379         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 380                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 381         if (r < 0)
 382                 goto disconnect_all;
 383
 384         if (skb->len && skb->len == strlen(hdev->init_data.session_id))
 385                 if (memcmp(hdev->init_data.session_id, skb->data,
 386                            skb->len) == 0) {
 387                         /* TODO ELa: restore gate<->pipe table from
 388                          * some TBD location.
 389                          * note: it doesn't seem possible to get the chip
 390                          * currently open gate/pipe table.
 391                          * It is only possible to obtain the supported
 392                          * gate list.
 393                          */
 394
 395                         /* goto exit
 396                          * For now, always do a full initialization */
 397                 }
 398
 399         r = nfc_hci_disconnect_all_gates(hdev);
 400         if (r < 0)
 401                 goto exit;
 402
 403         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 404                                   hdev->init_data.gates);
 405         if (r < 0)
 406                 goto disconnect_all;
 407
 408         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 409                               NFC_HCI_ADMIN_SESSION_IDENTITY,
 410                               hdev->init_data.session_id,
 411                               strlen(hdev->init_data.session_id));
 412         if (r == 0)
 413                 goto exit;
 414
 415 disconnect_all:
 416         nfc_hci_disconnect_all_gates(hdev);
 417
 418 exit:
 419         kfree_skb(skb);
 420
 421         return r;
 422 }
 423
 424 static int hci_dev_version(struct nfc_hci_dev *hdev)
 425 {
 426         int r;
 427         struct sk_buff *skb;
 428
 429         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 430                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 431         if (r == -EOPNOTSUPP) {
 432                 pr_info("Software/Hardware info not available\n");
 433                 return 0;
 434         }
 435         if (r < 0)
 436                 return r;
 437
 438         if (skb->len != 3) {
 439                 kfree_skb(skb);
 440                 return -EINVAL;
 441         }
 442
 443         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 444         hdev->sw_patch = skb->data[0] & 0x0f;
 445         hdev->sw_flashlib_major = skb->data[1];
 446         hdev->sw_flashlib_minor = skb->data[2];
 447
 448         kfree_skb(skb);
 449
 450         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 451                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 452         if (r < 0)
 453                 return r;
 454
 455         if (skb->len != 3) {
 456                 kfree_skb(skb);
 457                 return -EINVAL;
 458         }
 459
 460         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 461         hdev->hw_version = skb->data[0] & 0x1f;
 462         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 463         hdev->hw_software = skb->data[1] & 0x3f;
 464         hdev->hw_bsid = skb->data[2];
 465
 466         kfree_skb(skb);
 467
 468         pr_info("SOFTWARE INFO:\n");
 469         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 470         pr_info("Patch          : %d\n", hdev->sw_patch);
 471         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 472         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 473         pr_info("HARDWARE INFO:\n");
 474         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 475         pr_info("HW Version     : %d\n", hdev->hw_version);
 476         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 477         pr_info("Software       : %d\n", hdev->hw_software);
 478         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 479
 480         return 0;
 481 }
 482
 483 static int hci_dev_up(struct nfc_dev *nfc_dev)
 484 {
 485         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 486         int r = 0;
 487
 488         if (hdev->ops->open) {
 489                 r = hdev->ops->open(hdev);
 490                 if (r < 0)
 491                         return r;
 492         }
 493
 494         r = nfc_llc_start(hdev->llc);
 495         if (r < 0)
 496                 goto exit_close;
 497
 498         r = hci_dev_session_init(hdev);
 499         if (r < 0)
 500                 goto exit_llc;
 501
 502         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 503                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 504         if (r < 0)
 505                 goto exit_llc;
 506
 507         if (hdev->ops->hci_ready) {
 508                 r = hdev->ops->hci_ready(hdev);
 509                 if (r < 0)
 510                         goto exit_llc;
 511         }
 512
 513         r = hci_dev_version(hdev);
 514         if (r < 0)
 515                 goto exit_llc;
 516
 517         return 0;
 518
 519 exit_llc:
 520         nfc_llc_stop(hdev->llc);
 521
 522 exit_close:
 523         if (hdev->ops->close)
 524                 hdev->ops->close(hdev);
 525
 526         return r;
 527 }
 528
 529 static int hci_dev_down(struct nfc_dev *nfc_dev)
 530 {
 531         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 532
 533         nfc_llc_stop(hdev->llc);
 534
 535         if (hdev->ops->close)
 536                 hdev->ops->close(hdev);
 537
 538         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 539
 540         return 0;
 541 }
 542
 543 static int hci_start_poll(struct nfc_dev *nfc_dev,
 544                           u32 im_protocols, u32 tm_protocols)
 545 {
 546         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 547
 548         if (hdev->ops->start_poll)
 549                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 550         else
 551                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 552                                           NFC_HCI_EVT_READER_REQUESTED,
 553                                           NULL, 0);
 554 }
 555
 556 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 557 {
 558         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 559
 560         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 561                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 562 }
 563
 564 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 565                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 566 {
 567         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 568
 569         if (hdev->ops->dep_link_up)
 570                 return hdev->ops->dep_link_up(hdev, target, comm_mode,
 571                                                 gb, gb_len);
 572
 573         return 0;
 574 }
 575
 576 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 577 {
 578         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 579
 580         if (hdev->ops->dep_link_down)
 581                 return hdev->ops->dep_link_down(hdev);
 582
 583         return 0;
 584 }
 585
 586 static int hci_activate_target(struct nfc_dev *nfc_dev,
 587                                struct nfc_target *target, u32 protocol)
 588 {
 589         return 0;
 590 }
 591
 592 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 593                                   struct nfc_target *target)
 594 {
 595 }
 596
 597 #define HCI_CB_TYPE_TRANSCEIVE 1
 598
 599 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 600 {
 601         struct nfc_hci_dev *hdev = context;
 602
 603         switch (hdev->async_cb_type) {
 604         case HCI_CB_TYPE_TRANSCEIVE:
 605                 /*
 606                  * TODO: Check RF Error indicator to make sure data is valid.
 607                  * It seems that HCI cmd can complete without error, but data
 608                  * can be invalid if an RF error occured? Ignore for now.
 609                  */
 610                 if (err == 0)
 611                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 612
 613                 hdev->async_cb(hdev->async_cb_context, skb, err);
 614                 break;
 615         default:
 616                 if (err == 0)
 617                         kfree_skb(skb);
 618                 break;
 619         }
 620 }
 621
 622 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 623                           struct sk_buff *skb, data_exchange_cb_t cb,
 624                           void *cb_context)
 625 {
 626         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 627         int r;
 628
 629         pr_debug("target_idx=%d\n", target->idx);
 630
 631         switch (target->hci_reader_gate) {
 632         case NFC_HCI_RF_READER_A_GATE:
 633         case NFC_HCI_RF_READER_B_GATE:
 634                 if (hdev->ops->im_transceive) {
 635                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 636                                                      cb_context);
 637                         if (r <= 0)     /* handled */
 638                                 break;
 639                 }
 640
 641                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 642
 643                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 644                 hdev->async_cb = cb;
 645                 hdev->async_cb_context = cb_context;
 646
 647                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 648                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 649                                            skb->len, hci_transceive_cb, hdev);
 650                 break;
 651         default:
 652                 if (hdev->ops->im_transceive) {
 653                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 654                                                      cb_context);
 655                         if (r == 1)
 656                                 r = -ENOTSUPP;
 657                 } else {
 658                         r = -ENOTSUPP;
 659                 }
 660                 break;
 661         }
 662
 663         kfree_skb(skb);
 664
 665         return r;
 666 }
 667
 668 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 669 {
 670         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 671
 672         if (hdev->ops->tm_send)
 673                 return hdev->ops->tm_send(hdev, skb);
 674         else
 675                 return -ENOTSUPP;
 676 }
 677
 678 static int hci_check_presence(struct nfc_dev *nfc_dev,
 679                               struct nfc_target *target)
 680 {
 681         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 682
 683         if (hdev->ops->check_presence)
 684                 return hdev->ops->check_presence(hdev, target);
 685
 686         return 0;
 687 }
 688
 689 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 690 {
 691         mutex_lock(&hdev->msg_tx_mutex);
 692
 693         if (hdev->cmd_pending_msg == NULL) {
 694                 nfc_driver_failure(hdev->ndev, err);
 695                 goto exit;
 696         }
 697
 698         __nfc_hci_cmd_completion(hdev, err, NULL);
 699
 700 exit:
 701         mutex_unlock(&hdev->msg_tx_mutex);
 702 }
 703
 704 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 705 {
 706         nfc_hci_failure(hdev, err);
 707 }
 708
 709 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 710 {
 711         struct hcp_packet *packet;
 712         u8 type;
 713         u8 instruction;
 714         struct sk_buff *hcp_skb;
 715         u8 pipe;
 716         struct sk_buff *frag_skb;
 717         int msg_len;
 718
 719         packet = (struct hcp_packet *)skb->data;
 720         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 721                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 722                 return;
 723         }
 724
 725         /* it's the last fragment. Does it need re-aggregation? */
 726         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 727                 pipe = packet->header & NFC_HCI_FRAGMENT;
 728                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 729
 730                 msg_len = 0;
 731                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 732                         msg_len += (frag_skb->len -
 733                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 734                 }
 735
 736                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 737                                              msg_len, GFP_KERNEL);
 738                 if (hcp_skb == NULL) {
 739                         nfc_hci_failure(hdev, -ENOMEM);
 740                         return;
 741                 }
 742
 743                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 744
 745                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 746                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 747                         memcpy(skb_put(hcp_skb, msg_len),
 748                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 749                                msg_len);
 750                 }
 751
 752                 skb_queue_purge(&hdev->rx_hcp_frags);
 753         } else {
 754                 packet->header &= NFC_HCI_FRAGMENT;
 755                 hcp_skb = skb;
 756         }
 757
 758         /* if this is a response, dispatch immediately to
 759          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 760          * in separate context where handler can also execute command.
 761          */
 762         packet = (struct hcp_packet *)hcp_skb->data;
 763         type = HCP_MSG_GET_TYPE(packet->message.header);
 764         if (type == NFC_HCI_HCP_RESPONSE) {
 765                 pipe = packet->header;
 766                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 767                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 768                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 769                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 770         } else {
 771                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 772                 schedule_work(&hdev->msg_rx_work);
 773         }
 774 }
 775
 776 static struct nfc_ops hci_nfc_ops = {
 777         .dev_up = hci_dev_up,
 778         .dev_down = hci_dev_down,
 779         .start_poll = hci_start_poll,
 780         .stop_poll = hci_stop_poll,
 781         .dep_link_up = hci_dep_link_up,
 782         .dep_link_down = hci_dep_link_down,
 783         .activate_target = hci_activate_target,
 784         .deactivate_target = hci_deactivate_target,
 785         .im_transceive = hci_transceive,
 786         .tm_send = hci_tm_send,
 787         .check_presence = hci_check_presence,
 788 };
 789
 790 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 791                                             struct nfc_hci_init_data *init_data,
 792                                             u32 protocols,
 793                                             const char *llc_name,
 794                                             int tx_headroom,
 795                                             int tx_tailroom,
 796                                             int max_link_payload)
 797 {
 798         struct nfc_hci_dev *hdev;
 799
 800         if (ops->xmit == NULL)
 801                 return NULL;
 802
 803         if (protocols == 0)
 804                 return NULL;
 805
 806         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 807         if (hdev == NULL)
 808                 return NULL;
 809
 810         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 811                                      nfc_hci_recv_from_llc, tx_headroom,
 812                                      tx_tailroom, nfc_hci_llc_failure);
 813         if (hdev->llc == NULL) {
 814                 kfree(hdev);
 815                 return NULL;
 816         }
 817
 818         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 819                                          tx_headroom + HCI_CMDS_HEADROOM,
 820                                          tx_tailroom);
 821         if (!hdev->ndev) {
 822                 nfc_llc_free(hdev->llc);
 823                 kfree(hdev);
 824                 return NULL;
 825         }
 826
 827         hdev->ops = ops;
 828         hdev->max_data_link_payload = max_link_payload;
 829         hdev->init_data = *init_data;
 830
 831         nfc_set_drvdata(hdev->ndev, hdev);
 832
 833         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 834
 835         return hdev;
 836 }
 837 EXPORT_SYMBOL(nfc_hci_allocate_device);
 838
 839 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 840 {
 841         nfc_free_device(hdev->ndev);
 842         nfc_llc_free(hdev->llc);
 843         kfree(hdev);
 844 }
 845 EXPORT_SYMBOL(nfc_hci_free_device);
 846
 847 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
 848 {
 849         mutex_init(&hdev->msg_tx_mutex);
 850
 851         INIT_LIST_HEAD(&hdev->msg_tx_queue);
 852
 853         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
 854
 855         init_timer(&hdev->cmd_timer);
 856         hdev->cmd_timer.data = (unsigned long)hdev;
 857         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
 858
 859         skb_queue_head_init(&hdev->rx_hcp_frags);
 860
 861         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
 862
 863         skb_queue_head_init(&hdev->msg_rx_queue);
 864
 865         return nfc_register_device(hdev->ndev);
 866 }
 867 EXPORT_SYMBOL(nfc_hci_register_device);
 868
 869 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
 870 {
 871         struct hci_msg *msg, *n;
 872
 873         mutex_lock(&hdev->msg_tx_mutex);
 874
 875         if (hdev->cmd_pending_msg) {
 876                 if (hdev->cmd_pending_msg->cb)
 877                         hdev->cmd_pending_msg->cb(
 878                                              hdev->cmd_pending_msg->cb_context,
 879                                              NULL, -ESHUTDOWN);
 880                 kfree(hdev->cmd_pending_msg);
 881                 hdev->cmd_pending_msg = NULL;
 882         }
 883
 884         hdev->shutting_down = true;
 885
 886         mutex_unlock(&hdev->msg_tx_mutex);
 887
 888         del_timer_sync(&hdev->cmd_timer);
 889         cancel_work_sync(&hdev->msg_tx_work);
 890
 891         cancel_work_sync(&hdev->msg_rx_work);
 892
 893         nfc_unregister_device(hdev->ndev);
 894
 895         skb_queue_purge(&hdev->rx_hcp_frags);
 896         skb_queue_purge(&hdev->msg_rx_queue);
 897
 898         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
 899                 list_del(&msg->msg_l);
 900                 skb_queue_purge(&msg->msg_frags);
 901                 kfree(msg);
 902         }
 903 }
 904 EXPORT_SYMBOL(nfc_hci_unregister_device);
 905
 906 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
 907 {
 908         hdev->clientdata = clientdata;
 909 }
 910 EXPORT_SYMBOL(nfc_hci_set_clientdata);
 911
 912 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
 913 {
 914         return hdev->clientdata;
 915 }
 916 EXPORT_SYMBOL(nfc_hci_get_clientdata);
 917
 918 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
 919 {
 920         nfc_hci_failure(hdev, err);
 921 }
 922 EXPORT_SYMBOL(nfc_hci_driver_failure);
 923
 924 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 925 {
 926         nfc_llc_rcv_from_drv(hdev->llc, skb);
 927 }
 928 EXPORT_SYMBOL(nfc_hci_recv_frame);
 929
 930 static int __init nfc_hci_init(void)
 931 {
 932         return nfc_llc_init();
 933 }
 934
 935 static void __exit nfc_hci_exit(void)
 936 {
 937         nfc_llc_exit();
 938 }
 939
 940 subsys_initcall(nfc_hci_init);
 941 module_exit(nfc_hci_exit);
 942
 943 MODULE_LICENSE("GPL");
 944 MODULE_DESCRIPTION("NFC HCI Core");