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 int nfc_hci_result_to_errno(u8 result)
  37 {
  38         switch (result) {
  39         case NFC_HCI_ANY_OK:
  40                 return 0;
  41         case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
  42                 return -EOPNOTSUPP;
  43         case NFC_HCI_ANY_E_TIMEOUT:
  44                 return -ETIME;
  45         default:
  46                 return -1;
  47         }
  48 }
  49 EXPORT_SYMBOL(nfc_hci_result_to_errno);
  50
  51 static void nfc_hci_msg_tx_work(struct work_struct *work)
  52 {
  53         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
  54                                                 msg_tx_work);
  55         struct hci_msg *msg;
  56         struct sk_buff *skb;
  57         int r = 0;
  58
  59         mutex_lock(&hdev->msg_tx_mutex);
  60
  61         if (hdev->cmd_pending_msg) {
  62                 if (timer_pending(&hdev->cmd_timer) == 0) {
  63                         if (hdev->cmd_pending_msg->cb)
  64                                 hdev->cmd_pending_msg->cb(hdev->
  65                                                           cmd_pending_msg->
  66                                                           cb_context,
  67                                                           NULL,
  68                                                           -ETIME);
  69                         kfree(hdev->cmd_pending_msg);
  70                         hdev->cmd_pending_msg = NULL;
  71                 } else {
  72                         goto exit;
  73                 }
  74         }
  75
  76 next_msg:
  77         if (list_empty(&hdev->msg_tx_queue))
  78                 goto exit;
  79
  80         msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
  81         list_del(&msg->msg_l);
  82
  83         pr_debug("msg_tx_queue has a cmd to send\n");
  84         while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
  85                 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
  86                 if (r < 0) {
  87                         kfree_skb(skb);
  88                         skb_queue_purge(&msg->msg_frags);
  89                         if (msg->cb)
  90                                 msg->cb(msg->cb_context, NULL, r);
  91                         kfree(msg);
  92                         break;
  93                 }
  94         }
  95
  96         if (r)
  97                 goto next_msg;
  98
  99         if (msg->wait_response == false) {
 100                 kfree(msg);
 101                 goto next_msg;
 102         }
 103
 104         hdev->cmd_pending_msg = msg;
 105         mod_timer(&hdev->cmd_timer, jiffies +
 106                   msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
 107
 108 exit:
 109         mutex_unlock(&hdev->msg_tx_mutex);
 110 }
 111
 112 static void nfc_hci_msg_rx_work(struct work_struct *work)
 113 {
 114         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 115                                                 msg_rx_work);
 116         struct sk_buff *skb;
 117         struct hcp_message *message;
 118         u8 pipe;
 119         u8 type;
 120         u8 instruction;
 121
 122         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 123                 pipe = skb->data[0];
 124                 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
 125                 message = (struct hcp_message *)skb->data;
 126                 type = HCP_MSG_GET_TYPE(message->header);
 127                 instruction = HCP_MSG_GET_CMD(message->header);
 128                 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 129
 130                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
 131         }
 132 }
 133
 134 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
 135                                      struct sk_buff *skb)
 136 {
 137         del_timer_sync(&hdev->cmd_timer);
 138
 139         if (hdev->cmd_pending_msg->cb)
 140                 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
 141                                           skb, err);
 142         else
 143                 kfree_skb(skb);
 144
 145         kfree(hdev->cmd_pending_msg);
 146         hdev->cmd_pending_msg = NULL;
 147
 148         schedule_work(&hdev->msg_tx_work);
 149 }
 150
 151 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
 152                            struct sk_buff *skb)
 153 {
 154         mutex_lock(&hdev->msg_tx_mutex);
 155
 156         if (hdev->cmd_pending_msg == NULL) {
 157                 kfree_skb(skb);
 158                 goto exit;
 159         }
 160
 161         __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
 162
 163 exit:
 164         mutex_unlock(&hdev->msg_tx_mutex);
 165 }
 166
 167 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 168                           struct sk_buff *skb)
 169 {
 170         kfree_skb(skb);
 171 }
 172
 173 u32 nfc_hci_sak_to_protocol(u8 sak)
 174 {
 175         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
 176         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
 177                 return NFC_PROTO_MIFARE_MASK;
 178         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
 179                 return NFC_PROTO_ISO14443_MASK;
 180         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
 181                 return NFC_PROTO_NFC_DEP_MASK;
 182         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
 183                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
 184         default:
 185                 return 0xffffffff;
 186         }
 187 }
 188 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
 189
 190 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
 191 {
 192         struct nfc_target *targets;
 193         struct sk_buff *atqa_skb = NULL;
 194         struct sk_buff *sak_skb = NULL;
 195         struct sk_buff *uid_skb = NULL;
 196         int r;
 197
 198         pr_debug("from gate %d\n", gate);
 199
 200         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 201         if (targets == NULL)
 202                 return -ENOMEM;
 203
 204         switch (gate) {
 205         case NFC_HCI_RF_READER_A_GATE:
 206                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 207                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
 208                 if (r < 0)
 209                         goto exit;
 210
 211                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 212                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
 213                 if (r < 0)
 214                         goto exit;
 215
 216                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
 217                         r = -EPROTO;
 218                         goto exit;
 219                 }
 220
 221                 targets->supported_protocols =
 222                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
 223                 if (targets->supported_protocols == 0xffffffff) {
 224                         r = -EPROTO;
 225                         goto exit;
 226                 }
 227
 228                 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
 229                 targets->sel_res = sak_skb->data[0];
 230
 231                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 232                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
 233                 if (r < 0)
 234                         goto exit;
 235
 236                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 237                         r = -EPROTO;
 238                         goto exit;
 239                 }
 240
 241                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
 242                 targets->nfcid1_len = uid_skb->len;
 243
 244                 if (hdev->ops->complete_target_discovered) {
 245                         r = hdev->ops->complete_target_discovered(hdev, gate,
 246                                                                   targets);
 247                         if (r < 0)
 248                                 goto exit;
 249                 }
 250                 break;
 251         case NFC_HCI_RF_READER_B_GATE:
 252                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 253                 break;
 254         default:
 255                 if (hdev->ops->target_from_gate)
 256                         r = hdev->ops->target_from_gate(hdev, gate, targets);
 257                 else
 258                         r = -EPROTO;
 259                 if (r < 0)
 260                         goto exit;
 261
 262                 if (hdev->ops->complete_target_discovered) {
 263                         r = hdev->ops->complete_target_discovered(hdev, gate,
 264                                                                   targets);
 265                         if (r < 0)
 266                                 goto exit;
 267                 }
 268                 break;
 269         }
 270
 271         /* if driver set the new gate, we will skip the old one */
 272         if (targets->hci_reader_gate == 0x00)
 273                 targets->hci_reader_gate = gate;
 274
 275         r = nfc_targets_found(hdev->ndev, targets, 1);
 276
 277 exit:
 278         kfree(targets);
 279         kfree_skb(atqa_skb);
 280         kfree_skb(sak_skb);
 281         kfree_skb(uid_skb);
 282
 283         return r;
 284 }
 285 EXPORT_SYMBOL(nfc_hci_target_discovered);
 286
 287 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 288                             struct sk_buff *skb)
 289 {
 290         int r = 0;
 291         u8 gate = nfc_hci_pipe2gate(hdev, pipe);
 292
 293         if (gate == 0xff) {
 294                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
 295                 goto exit;
 296         }
 297
 298         switch (event) {
 299         case NFC_HCI_EVT_TARGET_DISCOVERED:
 300                 if (skb->len < 1) {     /* no status data? */
 301                         r = -EPROTO;
 302                         goto exit;
 303                 }
 304
 305                 if (skb->data[0] == 3) {
 306                         /* TODO: Multiple targets in field, none activated
 307                          * poll is supposedly stopped, but there is no
 308                          * single target to activate, so nothing to report
 309                          * up.
 310                          * if we need to restart poll, we must save the
 311                          * protocols from the initial poll and reuse here.
 312                          */
 313                 }
 314
 315                 if (skb->data[0] != 0) {
 316                         r = -EPROTO;
 317                         goto exit;
 318                 }
 319
 320                 r = nfc_hci_target_discovered(hdev, gate);
 321                 break;
 322         default:
 323                 if (hdev->ops->event_received) {
 324                         hdev->ops->event_received(hdev, gate, event, skb);
 325                         return;
 326                 }
 327
 328                 break;
 329         }
 330
 331 exit:
 332         kfree_skb(skb);
 333
 334         if (r) {
 335                 /* TODO: There was an error dispatching the event,
 336                  * how to propagate up to nfc core?
 337                  */
 338         }
 339 }
 340
 341 static void nfc_hci_cmd_timeout(unsigned long data)
 342 {
 343         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
 344
 345         schedule_work(&hdev->msg_tx_work);
 346 }
 347
 348 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 349                                  struct nfc_hci_gate *gates)
 350 {
 351         int r;
 352         while (gate_count--) {
 353                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 354                                          gates->gate, gates->pipe);
 355                 if (r < 0)
 356                         return r;
 357                 gates++;
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 364 {
 365         struct sk_buff *skb = NULL;
 366         int r;
 367
 368         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 369                 return -EPROTO;
 370
 371         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 372                                  hdev->init_data.gates[0].gate,
 373                                  hdev->init_data.gates[0].pipe);
 374         if (r < 0)
 375                 goto exit;
 376
 377         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 378                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 379         if (r < 0)
 380                 goto disconnect_all;
 381
 382         if (skb->len && skb->len == strlen(hdev->init_data.session_id))
 383                 if (memcmp(hdev->init_data.session_id, skb->data,
 384                            skb->len) == 0) {
 385                         /* TODO ELa: restore gate<->pipe table from
 386                          * some TBD location.
 387                          * note: it doesn't seem possible to get the chip
 388                          * currently open gate/pipe table.
 389                          * It is only possible to obtain the supported
 390                          * gate list.
 391                          */
 392
 393                         /* goto exit
 394                          * For now, always do a full initialization */
 395                 }
 396
 397         r = nfc_hci_disconnect_all_gates(hdev);
 398         if (r < 0)
 399                 goto exit;
 400
 401         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 402                                   hdev->init_data.gates);
 403         if (r < 0)
 404                 goto disconnect_all;
 405
 406         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 407                               NFC_HCI_ADMIN_SESSION_IDENTITY,
 408                               hdev->init_data.session_id,
 409                               strlen(hdev->init_data.session_id));
 410         if (r == 0)
 411                 goto exit;
 412
 413 disconnect_all:
 414         nfc_hci_disconnect_all_gates(hdev);
 415
 416 exit:
 417         kfree_skb(skb);
 418
 419         return r;
 420 }
 421
 422 static int hci_dev_version(struct nfc_hci_dev *hdev)
 423 {
 424         int r;
 425         struct sk_buff *skb;
 426
 427         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 428                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 429         if (r == -EOPNOTSUPP) {
 430                 pr_info("Software/Hardware info not available\n");
 431                 return 0;
 432         }
 433         if (r < 0)
 434                 return r;
 435
 436         if (skb->len != 3) {
 437                 kfree_skb(skb);
 438                 return -EINVAL;
 439         }
 440
 441         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 442         hdev->sw_patch = skb->data[0] & 0x0f;
 443         hdev->sw_flashlib_major = skb->data[1];
 444         hdev->sw_flashlib_minor = skb->data[2];
 445
 446         kfree_skb(skb);
 447
 448         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 449                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 450         if (r < 0)
 451                 return r;
 452
 453         if (skb->len != 3) {
 454                 kfree_skb(skb);
 455                 return -EINVAL;
 456         }
 457
 458         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 459         hdev->hw_version = skb->data[0] & 0x1f;
 460         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 461         hdev->hw_software = skb->data[1] & 0x3f;
 462         hdev->hw_bsid = skb->data[2];
 463
 464         kfree_skb(skb);
 465
 466         pr_info("SOFTWARE INFO:\n");
 467         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 468         pr_info("Patch          : %d\n", hdev->sw_patch);
 469         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 470         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 471         pr_info("HARDWARE INFO:\n");
 472         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 473         pr_info("HW Version     : %d\n", hdev->hw_version);
 474         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 475         pr_info("Software       : %d\n", hdev->hw_software);
 476         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 477
 478         return 0;
 479 }
 480
 481 static int hci_dev_up(struct nfc_dev *nfc_dev)
 482 {
 483         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 484         int r = 0;
 485
 486         if (hdev->ops->open) {
 487                 r = hdev->ops->open(hdev);
 488                 if (r < 0)
 489                         return r;
 490         }
 491
 492         r = nfc_llc_start(hdev->llc);
 493         if (r < 0)
 494                 goto exit_close;
 495
 496         r = hci_dev_session_init(hdev);
 497         if (r < 0)
 498                 goto exit_llc;
 499
 500         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 501                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 502         if (r < 0)
 503                 goto exit_llc;
 504
 505         if (hdev->ops->hci_ready) {
 506                 r = hdev->ops->hci_ready(hdev);
 507                 if (r < 0)
 508                         goto exit_llc;
 509         }
 510
 511         r = hci_dev_version(hdev);
 512         if (r < 0)
 513                 goto exit_llc;
 514
 515         return 0;
 516
 517 exit_llc:
 518         nfc_llc_stop(hdev->llc);
 519
 520 exit_close:
 521         if (hdev->ops->close)
 522                 hdev->ops->close(hdev);
 523
 524         return r;
 525 }
 526
 527 static int hci_dev_down(struct nfc_dev *nfc_dev)
 528 {
 529         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 530
 531         nfc_llc_stop(hdev->llc);
 532
 533         if (hdev->ops->close)
 534                 hdev->ops->close(hdev);
 535
 536         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 537
 538         return 0;
 539 }
 540
 541 static int hci_start_poll(struct nfc_dev *nfc_dev,
 542                           u32 im_protocols, u32 tm_protocols)
 543 {
 544         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 545
 546         if (hdev->ops->start_poll)
 547                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 548         else
 549                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 550                                           NFC_HCI_EVT_READER_REQUESTED,
 551                                           NULL, 0);
 552 }
 553
 554 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 555 {
 556         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 557
 558         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 559                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 560 }
 561
 562 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 563                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 564 {
 565         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 566
 567         if (hdev->ops->dep_link_up)
 568                 return hdev->ops->dep_link_up(hdev, target, comm_mode,
 569                                                 gb, gb_len);
 570
 571         return 0;
 572 }
 573
 574 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 575 {
 576         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 577
 578         if (hdev->ops->dep_link_down)
 579                 return hdev->ops->dep_link_down(hdev);
 580
 581         return 0;
 582 }
 583
 584 static int hci_activate_target(struct nfc_dev *nfc_dev,
 585                                struct nfc_target *target, u32 protocol)
 586 {
 587         return 0;
 588 }
 589
 590 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 591                                   struct nfc_target *target)
 592 {
 593 }
 594
 595 #define HCI_CB_TYPE_TRANSCEIVE 1
 596
 597 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 598 {
 599         struct nfc_hci_dev *hdev = context;
 600
 601         switch (hdev->async_cb_type) {
 602         case HCI_CB_TYPE_TRANSCEIVE:
 603                 /*
 604                  * TODO: Check RF Error indicator to make sure data is valid.
 605                  * It seems that HCI cmd can complete without error, but data
 606                  * can be invalid if an RF error occured? Ignore for now.
 607                  */
 608                 if (err == 0)
 609                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 610
 611                 hdev->async_cb(hdev->async_cb_context, skb, err);
 612                 break;
 613         default:
 614                 if (err == 0)
 615                         kfree_skb(skb);
 616                 break;
 617         }
 618 }
 619
 620 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 621                           struct sk_buff *skb, data_exchange_cb_t cb,
 622                           void *cb_context)
 623 {
 624         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 625         int r;
 626
 627         pr_debug("target_idx=%d\n", target->idx);
 628
 629         switch (target->hci_reader_gate) {
 630         case NFC_HCI_RF_READER_A_GATE:
 631         case NFC_HCI_RF_READER_B_GATE:
 632                 if (hdev->ops->im_transceive) {
 633                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 634                                                      cb_context);
 635                         if (r <= 0)     /* handled */
 636                                 break;
 637                 }
 638
 639                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 640
 641                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 642                 hdev->async_cb = cb;
 643                 hdev->async_cb_context = cb_context;
 644
 645                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 646                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 647                                            skb->len, hci_transceive_cb, hdev);
 648                 break;
 649         default:
 650                 if (hdev->ops->im_transceive) {
 651                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 652                                                      cb_context);
 653                         if (r == 1)
 654                                 r = -ENOTSUPP;
 655                 } else {
 656                         r = -ENOTSUPP;
 657                 }
 658                 break;
 659         }
 660
 661         kfree_skb(skb);
 662
 663         return r;
 664 }
 665
 666 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 667 {
 668         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 669
 670         if (hdev->ops->tm_send)
 671                 return hdev->ops->tm_send(hdev, skb);
 672         else
 673                 return -ENOTSUPP;
 674 }
 675
 676 static int hci_check_presence(struct nfc_dev *nfc_dev,
 677                               struct nfc_target *target)
 678 {
 679         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 680
 681         if (hdev->ops->check_presence)
 682                 return hdev->ops->check_presence(hdev, target);
 683
 684         return 0;
 685 }
 686
 687 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 688 {
 689         mutex_lock(&hdev->msg_tx_mutex);
 690
 691         if (hdev->cmd_pending_msg == NULL) {
 692                 nfc_driver_failure(hdev->ndev, err);
 693                 goto exit;
 694         }
 695
 696         __nfc_hci_cmd_completion(hdev, err, NULL);
 697
 698 exit:
 699         mutex_unlock(&hdev->msg_tx_mutex);
 700 }
 701
 702 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 703 {
 704         nfc_hci_failure(hdev, err);
 705 }
 706
 707 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 708 {
 709         struct hcp_packet *packet;
 710         u8 type;
 711         u8 instruction;
 712         struct sk_buff *hcp_skb;
 713         u8 pipe;
 714         struct sk_buff *frag_skb;
 715         int msg_len;
 716
 717         packet = (struct hcp_packet *)skb->data;
 718         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 719                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 720                 return;
 721         }
 722
 723         /* it's the last fragment. Does it need re-aggregation? */
 724         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 725                 pipe = packet->header & NFC_HCI_FRAGMENT;
 726                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 727
 728                 msg_len = 0;
 729                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 730                         msg_len += (frag_skb->len -
 731                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 732                 }
 733
 734                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 735                                              msg_len, GFP_KERNEL);
 736                 if (hcp_skb == NULL) {
 737                         nfc_hci_failure(hdev, -ENOMEM);
 738                         return;
 739                 }
 740
 741                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 742
 743                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 744                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 745                         memcpy(skb_put(hcp_skb, msg_len),
 746                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 747                                msg_len);
 748                 }
 749
 750                 skb_queue_purge(&hdev->rx_hcp_frags);
 751         } else {
 752                 packet->header &= NFC_HCI_FRAGMENT;
 753                 hcp_skb = skb;
 754         }
 755
 756         /* if this is a response, dispatch immediately to
 757          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 758          * in separate context where handler can also execute command.
 759          */
 760         packet = (struct hcp_packet *)hcp_skb->data;
 761         type = HCP_MSG_GET_TYPE(packet->message.header);
 762         if (type == NFC_HCI_HCP_RESPONSE) {
 763                 pipe = packet->header;
 764                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 765                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 766                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 767                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 768         } else {
 769                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 770                 schedule_work(&hdev->msg_rx_work);
 771         }
 772 }
 773
 774 static struct nfc_ops hci_nfc_ops = {
 775         .dev_up = hci_dev_up,
 776         .dev_down = hci_dev_down,
 777         .start_poll = hci_start_poll,
 778         .stop_poll = hci_stop_poll,
 779         .dep_link_up = hci_dep_link_up,
 780         .dep_link_down = hci_dep_link_down,
 781         .activate_target = hci_activate_target,
 782         .deactivate_target = hci_deactivate_target,
 783         .im_transceive = hci_transceive,
 784         .tm_send = hci_tm_send,
 785         .check_presence = hci_check_presence,
 786 };
 787
 788 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 789                                             struct nfc_hci_init_data *init_data,
 790                                             u32 protocols,
 791                                             const char *llc_name,
 792                                             int tx_headroom,
 793                                             int tx_tailroom,
 794                                             int max_link_payload)
 795 {
 796         struct nfc_hci_dev *hdev;
 797
 798         if (ops->xmit == NULL)
 799                 return NULL;
 800
 801         if (protocols == 0)
 802                 return NULL;
 803
 804         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 805         if (hdev == NULL)
 806                 return NULL;
 807
 808         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 809                                      nfc_hci_recv_from_llc, tx_headroom,
 810                                      tx_tailroom, nfc_hci_llc_failure);
 811         if (hdev->llc == NULL) {
 812                 kfree(hdev);
 813                 return NULL;
 814         }
 815
 816         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 817                                          tx_headroom + HCI_CMDS_HEADROOM,
 818                                          tx_tailroom);
 819         if (!hdev->ndev) {
 820                 nfc_llc_free(hdev->llc);
 821                 kfree(hdev);
 822                 return NULL;
 823         }
 824
 825         hdev->ops = ops;
 826         hdev->max_data_link_payload = max_link_payload;
 827         hdev->init_data = *init_data;
 828
 829         nfc_set_drvdata(hdev->ndev, hdev);
 830
 831         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 832
 833         return hdev;
 834 }
 835 EXPORT_SYMBOL(nfc_hci_allocate_device);
 836
 837 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 838 {
 839         nfc_free_device(hdev->ndev);
 840         nfc_llc_free(hdev->llc);
 841         kfree(hdev);
 842 }
 843 EXPORT_SYMBOL(nfc_hci_free_device);
 844
 845 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
 846 {
 847         mutex_init(&hdev->msg_tx_mutex);
 848
 849         INIT_LIST_HEAD(&hdev->msg_tx_queue);
 850
 851         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
 852
 853         init_timer(&hdev->cmd_timer);
 854         hdev->cmd_timer.data = (unsigned long)hdev;
 855         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
 856
 857         skb_queue_head_init(&hdev->rx_hcp_frags);
 858
 859         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
 860
 861         skb_queue_head_init(&hdev->msg_rx_queue);
 862
 863         return nfc_register_device(hdev->ndev);
 864 }
 865 EXPORT_SYMBOL(nfc_hci_register_device);
 866
 867 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
 868 {
 869         struct hci_msg *msg, *n;
 870
 871         skb_queue_purge(&hdev->rx_hcp_frags);
 872         skb_queue_purge(&hdev->msg_rx_queue);
 873
 874         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
 875                 list_del(&msg->msg_l);
 876                 skb_queue_purge(&msg->msg_frags);
 877                 kfree(msg);
 878         }
 879
 880         del_timer_sync(&hdev->cmd_timer);
 881
 882         nfc_unregister_device(hdev->ndev);
 883
 884         cancel_work_sync(&hdev->msg_tx_work);
 885         cancel_work_sync(&hdev->msg_rx_work);
 886 }
 887 EXPORT_SYMBOL(nfc_hci_unregister_device);
 888
 889 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
 890 {
 891         hdev->clientdata = clientdata;
 892 }
 893 EXPORT_SYMBOL(nfc_hci_set_clientdata);
 894
 895 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
 896 {
 897         return hdev->clientdata;
 898 }
 899 EXPORT_SYMBOL(nfc_hci_get_clientdata);
 900
 901 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
 902 {
 903         nfc_hci_failure(hdev, err);
 904 }
 905 EXPORT_SYMBOL(nfc_hci_driver_failure);
 906
 907 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 908 {
 909         nfc_llc_rcv_from_drv(hdev->llc, skb);
 910 }
 911 EXPORT_SYMBOL(nfc_hci_recv_frame);
 912
 913 static int __init nfc_hci_init(void)
 914 {
 915         return nfc_llc_init();
 916 }
 917
 918 static void __exit nfc_hci_exit(void)
 919 {
 920         nfc_llc_exit();
 921 }
 922
 923 subsys_initcall(nfc_hci_init);
 924 module_exit(nfc_hci_exit);
 925
 926 MODULE_LICENSE("GPL");
 927 MODULE_DESCRIPTION("NFC HCI Core");