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