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