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         targets->hci_reader_gate = gate;
 267
 268         r = nfc_targets_found(hdev->ndev, targets, 1);
 269
 270 exit:
 271         kfree(targets);
 272         kfree_skb(atqa_skb);
 273         kfree_skb(sak_skb);
 274         kfree_skb(uid_skb);
 275
 276         return r;
 277 }
 278 EXPORT_SYMBOL(nfc_hci_target_discovered);
 279
 280 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 281                             struct sk_buff *skb)
 282 {
 283         int r = 0;
 284
 285         switch (event) {
 286         case NFC_HCI_EVT_TARGET_DISCOVERED:
 287                 if (skb->len < 1) {     /* no status data? */
 288                         r = -EPROTO;
 289                         goto exit;
 290                 }
 291
 292                 if (skb->data[0] == 3) {
 293                         /* TODO: Multiple targets in field, none activated
 294                          * poll is supposedly stopped, but there is no
 295                          * single target to activate, so nothing to report
 296                          * up.
 297                          * if we need to restart poll, we must save the
 298                          * protocols from the initial poll and reuse here.
 299                          */
 300                 }
 301
 302                 if (skb->data[0] != 0) {
 303                         r = -EPROTO;
 304                         goto exit;
 305                 }
 306
 307                 r = nfc_hci_target_discovered(hdev,
 308                                               nfc_hci_pipe2gate(hdev, pipe));
 309                 break;
 310         default:
 311                 if (hdev->ops->event_received) {
 312                         hdev->ops->event_received(hdev,
 313                                                 nfc_hci_pipe2gate(hdev, pipe),
 314                                                 event, skb);
 315                         return;
 316                 }
 317
 318                 break;
 319         }
 320
 321 exit:
 322         kfree_skb(skb);
 323
 324         if (r) {
 325                 /* TODO: There was an error dispatching the event,
 326                  * how to propagate up to nfc core?
 327                  */
 328         }
 329 }
 330
 331 static void nfc_hci_cmd_timeout(unsigned long data)
 332 {
 333         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
 334
 335         schedule_work(&hdev->msg_tx_work);
 336 }
 337
 338 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 339                                  struct nfc_hci_gate *gates)
 340 {
 341         int r;
 342         while (gate_count--) {
 343                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 344                                          gates->gate, gates->pipe);
 345                 if (r < 0)
 346                         return r;
 347                 gates++;
 348         }
 349
 350         return 0;
 351 }
 352
 353 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 354 {
 355         struct sk_buff *skb = NULL;
 356         int r;
 357
 358         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 359                 return -EPROTO;
 360
 361         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 362                                  hdev->init_data.gates[0].gate,
 363                                  hdev->init_data.gates[0].pipe);
 364         if (r < 0)
 365                 goto exit;
 366
 367         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 368                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 369         if (r < 0)
 370                 goto disconnect_all;
 371
 372         if (skb->len && skb->len == strlen(hdev->init_data.session_id))
 373                 if (memcmp(hdev->init_data.session_id, skb->data,
 374                            skb->len) == 0) {
 375                         /* TODO ELa: restore gate<->pipe table from
 376                          * some TBD location.
 377                          * note: it doesn't seem possible to get the chip
 378                          * currently open gate/pipe table.
 379                          * It is only possible to obtain the supported
 380                          * gate list.
 381                          */
 382
 383                         /* goto exit
 384                          * For now, always do a full initialization */
 385                 }
 386
 387         r = nfc_hci_disconnect_all_gates(hdev);
 388         if (r < 0)
 389                 goto exit;
 390
 391         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 392                                   hdev->init_data.gates);
 393         if (r < 0)
 394                 goto disconnect_all;
 395
 396         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 397                               NFC_HCI_ADMIN_SESSION_IDENTITY,
 398                               hdev->init_data.session_id,
 399                               strlen(hdev->init_data.session_id));
 400         if (r == 0)
 401                 goto exit;
 402
 403 disconnect_all:
 404         nfc_hci_disconnect_all_gates(hdev);
 405
 406 exit:
 407         kfree_skb(skb);
 408
 409         return r;
 410 }
 411
 412 static int hci_dev_version(struct nfc_hci_dev *hdev)
 413 {
 414         int r;
 415         struct sk_buff *skb;
 416
 417         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 418                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 419         if (r < 0)
 420                 return r;
 421
 422         if (skb->len != 3) {
 423                 kfree_skb(skb);
 424                 return -EINVAL;
 425         }
 426
 427         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 428         hdev->sw_patch = skb->data[0] & 0x0f;
 429         hdev->sw_flashlib_major = skb->data[1];
 430         hdev->sw_flashlib_minor = skb->data[2];
 431
 432         kfree_skb(skb);
 433
 434         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 435                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 436         if (r < 0)
 437                 return r;
 438
 439         if (skb->len != 3) {
 440                 kfree_skb(skb);
 441                 return -EINVAL;
 442         }
 443
 444         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 445         hdev->hw_version = skb->data[0] & 0x1f;
 446         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 447         hdev->hw_software = skb->data[1] & 0x3f;
 448         hdev->hw_bsid = skb->data[2];
 449
 450         kfree_skb(skb);
 451
 452         pr_info("SOFTWARE INFO:\n");
 453         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 454         pr_info("Patch          : %d\n", hdev->sw_patch);
 455         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 456         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 457         pr_info("HARDWARE INFO:\n");
 458         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 459         pr_info("HW Version     : %d\n", hdev->hw_version);
 460         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 461         pr_info("Software       : %d\n", hdev->hw_software);
 462         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 463
 464         return 0;
 465 }
 466
 467 static int hci_dev_up(struct nfc_dev *nfc_dev)
 468 {
 469         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 470         int r = 0;
 471
 472         if (hdev->ops->open) {
 473                 r = hdev->ops->open(hdev);
 474                 if (r < 0)
 475                         return r;
 476         }
 477
 478         r = nfc_llc_start(hdev->llc);
 479         if (r < 0)
 480                 goto exit_close;
 481
 482         r = hci_dev_session_init(hdev);
 483         if (r < 0)
 484                 goto exit_llc;
 485
 486         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 487                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 488         if (r < 0)
 489                 goto exit_llc;
 490
 491         if (hdev->ops->hci_ready) {
 492                 r = hdev->ops->hci_ready(hdev);
 493                 if (r < 0)
 494                         goto exit_llc;
 495         }
 496
 497         r = hci_dev_version(hdev);
 498         if (r < 0)
 499                 goto exit_llc;
 500
 501         return 0;
 502
 503 exit_llc:
 504         nfc_llc_stop(hdev->llc);
 505
 506 exit_close:
 507         if (hdev->ops->close)
 508                 hdev->ops->close(hdev);
 509
 510         return r;
 511 }
 512
 513 static int hci_dev_down(struct nfc_dev *nfc_dev)
 514 {
 515         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 516
 517         nfc_llc_stop(hdev->llc);
 518
 519         if (hdev->ops->close)
 520                 hdev->ops->close(hdev);
 521
 522         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 523
 524         return 0;
 525 }
 526
 527 static int hci_start_poll(struct nfc_dev *nfc_dev,
 528                           u32 im_protocols, u32 tm_protocols)
 529 {
 530         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 531
 532         if (hdev->ops->start_poll)
 533                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 534         else
 535                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 536                                        NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
 537 }
 538
 539 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 540 {
 541         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 542
 543         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 544                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 545 }
 546
 547 static int hci_activate_target(struct nfc_dev *nfc_dev,
 548                                struct nfc_target *target, u32 protocol)
 549 {
 550         return 0;
 551 }
 552
 553 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 554                                   struct nfc_target *target)
 555 {
 556 }
 557
 558 #define HCI_CB_TYPE_TRANSCEIVE 1
 559
 560 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 561 {
 562         struct nfc_hci_dev *hdev = context;
 563
 564         switch (hdev->async_cb_type) {
 565         case HCI_CB_TYPE_TRANSCEIVE:
 566                 /*
 567                  * TODO: Check RF Error indicator to make sure data is valid.
 568                  * It seems that HCI cmd can complete without error, but data
 569                  * can be invalid if an RF error occured? Ignore for now.
 570                  */
 571                 if (err == 0)
 572                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 573
 574                 hdev->async_cb(hdev->async_cb_context, skb, err);
 575                 break;
 576         default:
 577                 if (err == 0)
 578                         kfree_skb(skb);
 579                 break;
 580         }
 581 }
 582
 583 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 584                           struct sk_buff *skb, data_exchange_cb_t cb,
 585                           void *cb_context)
 586 {
 587         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 588         int r;
 589
 590         pr_debug("target_idx=%d\n", target->idx);
 591
 592         switch (target->hci_reader_gate) {
 593         case NFC_HCI_RF_READER_A_GATE:
 594         case NFC_HCI_RF_READER_B_GATE:
 595                 if (hdev->ops->data_exchange) {
 596                         r = hdev->ops->data_exchange(hdev, target, skb, cb,
 597                                                      cb_context);
 598                         if (r <= 0)     /* handled */
 599                                 break;
 600                 }
 601
 602                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 603
 604                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 605                 hdev->async_cb = cb;
 606                 hdev->async_cb_context = cb_context;
 607
 608                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 609                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 610                                            skb->len, hci_transceive_cb, hdev);
 611                 break;
 612         default:
 613                 if (hdev->ops->data_exchange) {
 614                         r = hdev->ops->data_exchange(hdev, target, skb, cb,
 615                                                      cb_context);
 616                         if (r == 1)
 617                                 r = -ENOTSUPP;
 618                 }
 619                 else
 620                         r = -ENOTSUPP;
 621                 break;
 622         }
 623
 624         kfree_skb(skb);
 625
 626         return r;
 627 }
 628
 629 static int hci_check_presence(struct nfc_dev *nfc_dev,
 630                               struct nfc_target *target)
 631 {
 632         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 633
 634         if (hdev->ops->check_presence)
 635                 return hdev->ops->check_presence(hdev, target);
 636
 637         return 0;
 638 }
 639
 640 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 641 {
 642         mutex_lock(&hdev->msg_tx_mutex);
 643
 644         if (hdev->cmd_pending_msg == NULL) {
 645                 nfc_driver_failure(hdev->ndev, err);
 646                 goto exit;
 647         }
 648
 649         __nfc_hci_cmd_completion(hdev, err, NULL);
 650
 651 exit:
 652         mutex_unlock(&hdev->msg_tx_mutex);
 653 }
 654
 655 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 656 {
 657         nfc_hci_failure(hdev, err);
 658 }
 659
 660 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 661 {
 662         struct hcp_packet *packet;
 663         u8 type;
 664         u8 instruction;
 665         struct sk_buff *hcp_skb;
 666         u8 pipe;
 667         struct sk_buff *frag_skb;
 668         int msg_len;
 669
 670         packet = (struct hcp_packet *)skb->data;
 671         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 672                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 673                 return;
 674         }
 675
 676         /* it's the last fragment. Does it need re-aggregation? */
 677         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 678                 pipe = packet->header & NFC_HCI_FRAGMENT;
 679                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 680
 681                 msg_len = 0;
 682                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 683                         msg_len += (frag_skb->len -
 684                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 685                 }
 686
 687                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 688                                              msg_len, GFP_KERNEL);
 689                 if (hcp_skb == NULL) {
 690                         nfc_hci_failure(hdev, -ENOMEM);
 691                         return;
 692                 }
 693
 694                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 695
 696                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 697                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 698                         memcpy(skb_put(hcp_skb, msg_len),
 699                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 700                                msg_len);
 701                 }
 702
 703                 skb_queue_purge(&hdev->rx_hcp_frags);
 704         } else {
 705                 packet->header &= NFC_HCI_FRAGMENT;
 706                 hcp_skb = skb;
 707         }
 708
 709         /* if this is a response, dispatch immediately to
 710          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 711          * in separate context where handler can also execute command.
 712          */
 713         packet = (struct hcp_packet *)hcp_skb->data;
 714         type = HCP_MSG_GET_TYPE(packet->message.header);
 715         if (type == NFC_HCI_HCP_RESPONSE) {
 716                 pipe = packet->header;
 717                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 718                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 719                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 720                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 721         } else {
 722                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 723                 schedule_work(&hdev->msg_rx_work);
 724         }
 725 }
 726
 727 static struct nfc_ops hci_nfc_ops = {
 728         .dev_up = hci_dev_up,
 729         .dev_down = hci_dev_down,
 730         .start_poll = hci_start_poll,
 731         .stop_poll = hci_stop_poll,
 732         .activate_target = hci_activate_target,
 733         .deactivate_target = hci_deactivate_target,
 734         .im_transceive = hci_transceive,
 735         .check_presence = hci_check_presence,
 736 };
 737
 738 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 739                                             struct nfc_hci_init_data *init_data,
 740                                             u32 protocols,
 741                                             const char *llc_name,
 742                                             int tx_headroom,
 743                                             int tx_tailroom,
 744                                             int max_link_payload)
 745 {
 746         struct nfc_hci_dev *hdev;
 747
 748         if (ops->xmit == NULL)
 749                 return NULL;
 750
 751         if (protocols == 0)
 752                 return NULL;
 753
 754         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 755         if (hdev == NULL)
 756                 return NULL;
 757
 758         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 759                                      nfc_hci_recv_from_llc, tx_headroom,
 760                                      tx_tailroom, nfc_hci_llc_failure);
 761         if (hdev->llc == NULL) {
 762                 kfree(hdev);
 763                 return NULL;
 764         }
 765
 766         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 767                                          tx_headroom + HCI_CMDS_HEADROOM,
 768                                          tx_tailroom);
 769         if (!hdev->ndev) {
 770                 nfc_llc_free(hdev->llc);
 771                 kfree(hdev);
 772                 return NULL;
 773         }
 774
 775         hdev->ops = ops;
 776         hdev->max_data_link_payload = max_link_payload;
 777         hdev->init_data = *init_data;
 778
 779         nfc_set_drvdata(hdev->ndev, hdev);
 780
 781         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 782
 783         return hdev;
 784 }
 785 EXPORT_SYMBOL(nfc_hci_allocate_device);
 786
 787 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 788 {
 789         nfc_free_device(hdev->ndev);
 790         nfc_llc_free(hdev->llc);
 791         kfree(hdev);
 792 }
 793 EXPORT_SYMBOL(nfc_hci_free_device);
 794
 795 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
 796 {
 797         mutex_init(&hdev->msg_tx_mutex);
 798
 799         INIT_LIST_HEAD(&hdev->msg_tx_queue);
 800
 801         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
 802
 803         init_timer(&hdev->cmd_timer);
 804         hdev->cmd_timer.data = (unsigned long)hdev;
 805         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
 806
 807         skb_queue_head_init(&hdev->rx_hcp_frags);
 808
 809         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
 810
 811         skb_queue_head_init(&hdev->msg_rx_queue);
 812
 813         return nfc_register_device(hdev->ndev);
 814 }
 815 EXPORT_SYMBOL(nfc_hci_register_device);
 816
 817 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
 818 {
 819         struct hci_msg *msg, *n;
 820
 821         skb_queue_purge(&hdev->rx_hcp_frags);
 822         skb_queue_purge(&hdev->msg_rx_queue);
 823
 824         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
 825                 list_del(&msg->msg_l);
 826                 skb_queue_purge(&msg->msg_frags);
 827                 kfree(msg);
 828         }
 829
 830         del_timer_sync(&hdev->cmd_timer);
 831
 832         nfc_unregister_device(hdev->ndev);
 833
 834         cancel_work_sync(&hdev->msg_tx_work);
 835         cancel_work_sync(&hdev->msg_rx_work);
 836 }
 837 EXPORT_SYMBOL(nfc_hci_unregister_device);
 838
 839 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
 840 {
 841         hdev->clientdata = clientdata;
 842 }
 843 EXPORT_SYMBOL(nfc_hci_set_clientdata);
 844
 845 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
 846 {
 847         return hdev->clientdata;
 848 }
 849 EXPORT_SYMBOL(nfc_hci_get_clientdata);
 850
 851 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
 852 {
 853         nfc_hci_failure(hdev, err);
 854 }
 855 EXPORT_SYMBOL(nfc_hci_driver_failure);
 856
 857 void inline nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 858 {
 859         nfc_llc_rcv_from_drv(hdev->llc, skb);
 860 }
 861 EXPORT_SYMBOL(nfc_hci_recv_frame);
 862
 863 static int __init nfc_hci_init(void)
 864 {
 865         return nfc_llc_init();
 866 }
 867
 868 static void __exit nfc_hci_exit(void)
 869 {
 870         nfc_llc_exit();
 871 }
 872
 873 subsys_initcall(nfc_hci_init);
 874 module_exit(nfc_hci_exit);
 875
 876 MODULE_LICENSE("GPL");
 877 MODULE_DESCRIPTION("NFC HCI Core");