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