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
 290         switch (event) {
 291         case NFC_HCI_EVT_TARGET_DISCOVERED:
 292                 if (skb->len < 1) {     /* no status data? */
 293                         r = -EPROTO;
 294                         goto exit;
 295                 }
 296
 297                 if (skb->data[0] == 3) {
 298                         /* TODO: Multiple targets in field, none activated
 299                          * poll is supposedly stopped, but there is no
 300                          * single target to activate, so nothing to report
 301                          * up.
 302                          * if we need to restart poll, we must save the
 303                          * protocols from the initial poll and reuse here.
 304                          */
 305                 }
 306
 307                 if (skb->data[0] != 0) {
 308                         r = -EPROTO;
 309                         goto exit;
 310                 }
 311
 312                 r = nfc_hci_target_discovered(hdev,
 313                                               nfc_hci_pipe2gate(hdev, pipe));
 314                 break;
 315         default:
 316                 if (hdev->ops->event_received) {
 317                         hdev->ops->event_received(hdev,
 318                                                 nfc_hci_pipe2gate(hdev, pipe),
 319                                                 event, skb);
 320                         return;
 321                 }
 322
 323                 break;
 324         }
 325
 326 exit:
 327         kfree_skb(skb);
 328
 329         if (r) {
 330                 /* TODO: There was an error dispatching the event,
 331                  * how to propagate up to nfc core?
 332                  */
 333         }
 334 }
 335
 336 static void nfc_hci_cmd_timeout(unsigned long data)
 337 {
 338         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
 339
 340         schedule_work(&hdev->msg_tx_work);
 341 }
 342
 343 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 344                                  struct nfc_hci_gate *gates)
 345 {
 346         int r;
 347         while (gate_count--) {
 348                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 349                                          gates->gate, gates->pipe);
 350                 if (r < 0)
 351                         return r;
 352                 gates++;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 359 {
 360         struct sk_buff *skb = NULL;
 361         int r;
 362
 363         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 364                 return -EPROTO;
 365
 366         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 367                                  hdev->init_data.gates[0].gate,
 368                                  hdev->init_data.gates[0].pipe);
 369         if (r < 0)
 370                 goto exit;
 371
 372         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 373                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 374         if (r < 0)
 375                 goto disconnect_all;
 376
 377         if (skb->len && skb->len == strlen(hdev->init_data.session_id))
 378                 if (memcmp(hdev->init_data.session_id, skb->data,
 379                            skb->len) == 0) {
 380                         /* TODO ELa: restore gate<->pipe table from
 381                          * some TBD location.
 382                          * note: it doesn't seem possible to get the chip
 383                          * currently open gate/pipe table.
 384                          * It is only possible to obtain the supported
 385                          * gate list.
 386                          */
 387
 388                         /* goto exit
 389                          * For now, always do a full initialization */
 390                 }
 391
 392         r = nfc_hci_disconnect_all_gates(hdev);
 393         if (r < 0)
 394                 goto exit;
 395
 396         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 397                                   hdev->init_data.gates);
 398         if (r < 0)
 399                 goto disconnect_all;
 400
 401         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 402                               NFC_HCI_ADMIN_SESSION_IDENTITY,
 403                               hdev->init_data.session_id,
 404                               strlen(hdev->init_data.session_id));
 405         if (r == 0)
 406                 goto exit;
 407
 408 disconnect_all:
 409         nfc_hci_disconnect_all_gates(hdev);
 410
 411 exit:
 412         kfree_skb(skb);
 413
 414         return r;
 415 }
 416
 417 static int hci_dev_version(struct nfc_hci_dev *hdev)
 418 {
 419         int r;
 420         struct sk_buff *skb;
 421
 422         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 423                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 424         if (r == -EOPNOTSUPP) {
 425                 pr_info("Software/Hardware info not available\n");
 426                 return 0;
 427         }
 428         if (r < 0)
 429                 return r;
 430
 431         if (skb->len != 3) {
 432                 kfree_skb(skb);
 433                 return -EINVAL;
 434         }
 435
 436         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 437         hdev->sw_patch = skb->data[0] & 0x0f;
 438         hdev->sw_flashlib_major = skb->data[1];
 439         hdev->sw_flashlib_minor = skb->data[2];
 440
 441         kfree_skb(skb);
 442
 443         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 444                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 445         if (r < 0)
 446                 return r;
 447
 448         if (skb->len != 3) {
 449                 kfree_skb(skb);
 450                 return -EINVAL;
 451         }
 452
 453         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 454         hdev->hw_version = skb->data[0] & 0x1f;
 455         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 456         hdev->hw_software = skb->data[1] & 0x3f;
 457         hdev->hw_bsid = skb->data[2];
 458
 459         kfree_skb(skb);
 460
 461         pr_info("SOFTWARE INFO:\n");
 462         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 463         pr_info("Patch          : %d\n", hdev->sw_patch);
 464         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 465         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 466         pr_info("HARDWARE INFO:\n");
 467         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 468         pr_info("HW Version     : %d\n", hdev->hw_version);
 469         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 470         pr_info("Software       : %d\n", hdev->hw_software);
 471         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 472
 473         return 0;
 474 }
 475
 476 static int hci_dev_up(struct nfc_dev *nfc_dev)
 477 {
 478         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 479         int r = 0;
 480
 481         if (hdev->ops->open) {
 482                 r = hdev->ops->open(hdev);
 483                 if (r < 0)
 484                         return r;
 485         }
 486
 487         r = nfc_llc_start(hdev->llc);
 488         if (r < 0)
 489                 goto exit_close;
 490
 491         r = hci_dev_session_init(hdev);
 492         if (r < 0)
 493                 goto exit_llc;
 494
 495         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 496                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 497         if (r < 0)
 498                 goto exit_llc;
 499
 500         if (hdev->ops->hci_ready) {
 501                 r = hdev->ops->hci_ready(hdev);
 502                 if (r < 0)
 503                         goto exit_llc;
 504         }
 505
 506         r = hci_dev_version(hdev);
 507         if (r < 0)
 508                 goto exit_llc;
 509
 510         return 0;
 511
 512 exit_llc:
 513         nfc_llc_stop(hdev->llc);
 514
 515 exit_close:
 516         if (hdev->ops->close)
 517                 hdev->ops->close(hdev);
 518
 519         return r;
 520 }
 521
 522 static int hci_dev_down(struct nfc_dev *nfc_dev)
 523 {
 524         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 525
 526         nfc_llc_stop(hdev->llc);
 527
 528         if (hdev->ops->close)
 529                 hdev->ops->close(hdev);
 530
 531         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 532
 533         return 0;
 534 }
 535
 536 static int hci_start_poll(struct nfc_dev *nfc_dev,
 537                           u32 im_protocols, u32 tm_protocols)
 538 {
 539         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 540
 541         if (hdev->ops->start_poll)
 542                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 543         else
 544                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 545                                           NFC_HCI_EVT_READER_REQUESTED,
 546                                           NULL, 0);
 547 }
 548
 549 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 550 {
 551         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 552
 553         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 554                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 555 }
 556
 557 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 558                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 559 {
 560         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 561
 562         if (hdev->ops->dep_link_up)
 563                 return hdev->ops->dep_link_up(hdev, target, comm_mode,
 564                                                 gb, gb_len);
 565
 566         return 0;
 567 }
 568
 569 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 570 {
 571         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 572
 573         if (hdev->ops->dep_link_down)
 574                 return hdev->ops->dep_link_down(hdev);
 575
 576         return 0;
 577 }
 578
 579 static int hci_activate_target(struct nfc_dev *nfc_dev,
 580                                struct nfc_target *target, u32 protocol)
 581 {
 582         return 0;
 583 }
 584
 585 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 586                                   struct nfc_target *target)
 587 {
 588 }
 589
 590 #define HCI_CB_TYPE_TRANSCEIVE 1
 591
 592 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 593 {
 594         struct nfc_hci_dev *hdev = context;
 595
 596         switch (hdev->async_cb_type) {
 597         case HCI_CB_TYPE_TRANSCEIVE:
 598                 /*
 599                  * TODO: Check RF Error indicator to make sure data is valid.
 600                  * It seems that HCI cmd can complete without error, but data
 601                  * can be invalid if an RF error occured? Ignore for now.
 602                  */
 603                 if (err == 0)
 604                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 605
 606                 hdev->async_cb(hdev->async_cb_context, skb, err);
 607                 break;
 608         default:
 609                 if (err == 0)
 610                         kfree_skb(skb);
 611                 break;
 612         }
 613 }
 614
 615 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 616                           struct sk_buff *skb, data_exchange_cb_t cb,
 617                           void *cb_context)
 618 {
 619         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 620         int r;
 621
 622         pr_debug("target_idx=%d\n", target->idx);
 623
 624         switch (target->hci_reader_gate) {
 625         case NFC_HCI_RF_READER_A_GATE:
 626         case NFC_HCI_RF_READER_B_GATE:
 627                 if (hdev->ops->im_transceive) {
 628                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 629                                                      cb_context);
 630                         if (r <= 0)     /* handled */
 631                                 break;
 632                 }
 633
 634                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 635
 636                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 637                 hdev->async_cb = cb;
 638                 hdev->async_cb_context = cb_context;
 639
 640                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 641                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 642                                            skb->len, hci_transceive_cb, hdev);
 643                 break;
 644         default:
 645                 if (hdev->ops->im_transceive) {
 646                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 647                                                      cb_context);
 648                         if (r == 1)
 649                                 r = -ENOTSUPP;
 650                 } else {
 651                         r = -ENOTSUPP;
 652                 }
 653                 break;
 654         }
 655
 656         kfree_skb(skb);
 657
 658         return r;
 659 }
 660
 661 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 662 {
 663         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 664
 665         if (hdev->ops->tm_send)
 666                 return hdev->ops->tm_send(hdev, skb);
 667         else
 668                 return -ENOTSUPP;
 669 }
 670
 671 static int hci_check_presence(struct nfc_dev *nfc_dev,
 672                               struct nfc_target *target)
 673 {
 674         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 675
 676         if (hdev->ops->check_presence)
 677                 return hdev->ops->check_presence(hdev, target);
 678
 679         return 0;
 680 }
 681
 682 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 683 {
 684         mutex_lock(&hdev->msg_tx_mutex);
 685
 686         if (hdev->cmd_pending_msg == NULL) {
 687                 nfc_driver_failure(hdev->ndev, err);
 688                 goto exit;
 689         }
 690
 691         __nfc_hci_cmd_completion(hdev, err, NULL);
 692
 693 exit:
 694         mutex_unlock(&hdev->msg_tx_mutex);
 695 }
 696
 697 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 698 {
 699         nfc_hci_failure(hdev, err);
 700 }
 701
 702 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 703 {
 704         struct hcp_packet *packet;
 705         u8 type;
 706         u8 instruction;
 707         struct sk_buff *hcp_skb;
 708         u8 pipe;
 709         struct sk_buff *frag_skb;
 710         int msg_len;
 711
 712         packet = (struct hcp_packet *)skb->data;
 713         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 714                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 715                 return;
 716         }
 717
 718         /* it's the last fragment. Does it need re-aggregation? */
 719         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 720                 pipe = packet->header & NFC_HCI_FRAGMENT;
 721                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 722
 723                 msg_len = 0;
 724                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 725                         msg_len += (frag_skb->len -
 726                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 727                 }
 728
 729                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 730                                              msg_len, GFP_KERNEL);
 731                 if (hcp_skb == NULL) {
 732                         nfc_hci_failure(hdev, -ENOMEM);
 733                         return;
 734                 }
 735
 736                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 737
 738                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 739                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 740                         memcpy(skb_put(hcp_skb, msg_len),
 741                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 742                                msg_len);
 743                 }
 744
 745                 skb_queue_purge(&hdev->rx_hcp_frags);
 746         } else {
 747                 packet->header &= NFC_HCI_FRAGMENT;
 748                 hcp_skb = skb;
 749         }
 750
 751         /* if this is a response, dispatch immediately to
 752          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 753          * in separate context where handler can also execute command.
 754          */
 755         packet = (struct hcp_packet *)hcp_skb->data;
 756         type = HCP_MSG_GET_TYPE(packet->message.header);
 757         if (type == NFC_HCI_HCP_RESPONSE) {
 758                 pipe = packet->header;
 759                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 760                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 761                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 762                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 763         } else {
 764                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 765                 schedule_work(&hdev->msg_rx_work);
 766         }
 767 }
 768
 769 static struct nfc_ops hci_nfc_ops = {
 770         .dev_up = hci_dev_up,
 771         .dev_down = hci_dev_down,
 772         .start_poll = hci_start_poll,
 773         .stop_poll = hci_stop_poll,
 774         .dep_link_up = hci_dep_link_up,
 775         .dep_link_down = hci_dep_link_down,
 776         .activate_target = hci_activate_target,
 777         .deactivate_target = hci_deactivate_target,
 778         .im_transceive = hci_transceive,
 779         .tm_send = hci_tm_send,
 780         .check_presence = hci_check_presence,
 781 };
 782
 783 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 784                                             struct nfc_hci_init_data *init_data,
 785                                             u32 protocols,
 786                                             const char *llc_name,
 787                                             int tx_headroom,
 788                                             int tx_tailroom,
 789                                             int max_link_payload)
 790 {
 791         struct nfc_hci_dev *hdev;
 792
 793         if (ops->xmit == NULL)
 794                 return NULL;
 795
 796         if (protocols == 0)
 797                 return NULL;
 798
 799         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 800         if (hdev == NULL)
 801                 return NULL;
 802
 803         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 804                                      nfc_hci_recv_from_llc, tx_headroom,
 805                                      tx_tailroom, nfc_hci_llc_failure);
 806         if (hdev->llc == NULL) {
 807                 kfree(hdev);
 808                 return NULL;
 809         }
 810
 811         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 812                                          tx_headroom + HCI_CMDS_HEADROOM,
 813                                          tx_tailroom);
 814         if (!hdev->ndev) {
 815                 nfc_llc_free(hdev->llc);
 816                 kfree(hdev);
 817                 return NULL;
 818         }
 819
 820         hdev->ops = ops;
 821         hdev->max_data_link_payload = max_link_payload;
 822         hdev->init_data = *init_data;
 823
 824         nfc_set_drvdata(hdev->ndev, hdev);
 825
 826         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 827
 828         return hdev;
 829 }
 830 EXPORT_SYMBOL(nfc_hci_allocate_device);
 831
 832 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 833 {
 834         nfc_free_device(hdev->ndev);
 835         nfc_llc_free(hdev->llc);
 836         kfree(hdev);
 837 }
 838 EXPORT_SYMBOL(nfc_hci_free_device);
 839
 840 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
 841 {
 842         mutex_init(&hdev->msg_tx_mutex);
 843
 844         INIT_LIST_HEAD(&hdev->msg_tx_queue);
 845
 846         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
 847
 848         init_timer(&hdev->cmd_timer);
 849         hdev->cmd_timer.data = (unsigned long)hdev;
 850         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
 851
 852         skb_queue_head_init(&hdev->rx_hcp_frags);
 853
 854         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
 855
 856         skb_queue_head_init(&hdev->msg_rx_queue);
 857
 858         return nfc_register_device(hdev->ndev);
 859 }
 860 EXPORT_SYMBOL(nfc_hci_register_device);
 861
 862 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
 863 {
 864         struct hci_msg *msg, *n;
 865
 866         skb_queue_purge(&hdev->rx_hcp_frags);
 867         skb_queue_purge(&hdev->msg_rx_queue);
 868
 869         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
 870                 list_del(&msg->msg_l);
 871                 skb_queue_purge(&msg->msg_frags);
 872                 kfree(msg);
 873         }
 874
 875         del_timer_sync(&hdev->cmd_timer);
 876
 877         nfc_unregister_device(hdev->ndev);
 878
 879         cancel_work_sync(&hdev->msg_tx_work);
 880         cancel_work_sync(&hdev->msg_rx_work);
 881 }
 882 EXPORT_SYMBOL(nfc_hci_unregister_device);
 883
 884 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
 885 {
 886         hdev->clientdata = clientdata;
 887 }
 888 EXPORT_SYMBOL(nfc_hci_set_clientdata);
 889
 890 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
 891 {
 892         return hdev->clientdata;
 893 }
 894 EXPORT_SYMBOL(nfc_hci_get_clientdata);
 895
 896 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
 897 {
 898         nfc_hci_failure(hdev, err);
 899 }
 900 EXPORT_SYMBOL(nfc_hci_driver_failure);
 901
 902 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 903 {
 904         nfc_llc_rcv_from_drv(hdev->llc, skb);
 905 }
 906 EXPORT_SYMBOL(nfc_hci_recv_frame);
 907
 908 static int __init nfc_hci_init(void)
 909 {
 910         return nfc_llc_init();
 911 }
 912
 913 static void __exit nfc_hci_exit(void)
 914 {
 915         nfc_llc_exit();
 916 }
 917
 918 subsys_initcall(nfc_hci_init);
 919 module_exit(nfc_hci_exit);
 920
 921 MODULE_LICENSE("GPL");
 922 MODULE_DESCRIPTION("NFC HCI Core");