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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
  19
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/nfc.h>
  24
  25 #include <net/nfc/nfc.h>
  26 #include <net/nfc/hci.h>
  27 #include <net/nfc/llc.h>
  28
  29 #include "hci.h"
  30
  31 /* Largest headroom needed for outgoing HCI commands */
  32 #define HCI_CMDS_HEADROOM 1
  33
  34 int nfc_hci_result_to_errno(u8 result)
  35 {
  36         switch (result) {
  37         case NFC_HCI_ANY_OK:
  38                 return 0;
  39         case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
  40                 return -EOPNOTSUPP;
  41         case NFC_HCI_ANY_E_TIMEOUT:
  42                 return -ETIME;
  43         default:
  44                 return -1;
  45         }
  46 }
  47 EXPORT_SYMBOL(nfc_hci_result_to_errno);
  48
  49 static void nfc_hci_msg_tx_work(struct work_struct *work)
  50 {
  51         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
  52                                                 msg_tx_work);
  53         struct hci_msg *msg;
  54         struct sk_buff *skb;
  55         int r = 0;
  56
  57         mutex_lock(&hdev->msg_tx_mutex);
  58         if (hdev->shutting_down)
  59                 goto exit;
  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         if (hdev->ops->event_received) {
 299                 r = hdev->ops->event_received(hdev, gate, event, skb);
 300                 if (r <= 0)
 301                         goto exit_noskb;
 302         }
 303
 304         switch (event) {
 305         case NFC_HCI_EVT_TARGET_DISCOVERED:
 306                 if (skb->len < 1) {     /* no status data? */
 307                         r = -EPROTO;
 308                         goto exit;
 309                 }
 310
 311                 if (skb->data[0] == 3) {
 312                         /* TODO: Multiple targets in field, none activated
 313                          * poll is supposedly stopped, but there is no
 314                          * single target to activate, so nothing to report
 315                          * up.
 316                          * if we need to restart poll, we must save the
 317                          * protocols from the initial poll and reuse here.
 318                          */
 319                 }
 320
 321                 if (skb->data[0] != 0) {
 322                         r = -EPROTO;
 323                         goto exit;
 324                 }
 325
 326                 r = nfc_hci_target_discovered(hdev, gate);
 327                 break;
 328         default:
 329                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
 330                 r = -EINVAL;
 331                 break;
 332         }
 333
 334 exit:
 335         kfree_skb(skb);
 336
 337 exit_noskb:
 338         if (r) {
 339                 /* TODO: There was an error dispatching the event,
 340                  * how to propagate up to nfc core?
 341                  */
 342         }
 343 }
 344
 345 static void nfc_hci_cmd_timeout(unsigned long data)
 346 {
 347         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
 348
 349         schedule_work(&hdev->msg_tx_work);
 350 }
 351
 352 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 353                                  struct nfc_hci_gate *gates)
 354 {
 355         int r;
 356         while (gate_count--) {
 357                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 358                                          gates->gate, gates->pipe);
 359                 if (r < 0)
 360                         return r;
 361                 gates++;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 368 {
 369         struct sk_buff *skb = NULL;
 370         int r;
 371
 372         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 373                 return -EPROTO;
 374
 375         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 376                                  hdev->init_data.gates[0].gate,
 377                                  hdev->init_data.gates[0].pipe);
 378         if (r < 0)
 379                 goto exit;
 380
 381         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 382                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 383         if (r < 0)
 384                 goto disconnect_all;
 385
 386         if (skb->len && skb->len == strlen(hdev->init_data.session_id))
 387                 if (memcmp(hdev->init_data.session_id, skb->data,
 388                            skb->len) == 0) {
 389                         /* TODO ELa: restore gate<->pipe table from
 390                          * some TBD location.
 391                          * note: it doesn't seem possible to get the chip
 392                          * currently open gate/pipe table.
 393                          * It is only possible to obtain the supported
 394                          * gate list.
 395                          */
 396
 397                         /* goto exit
 398                          * For now, always do a full initialization */
 399                 }
 400
 401         r = nfc_hci_disconnect_all_gates(hdev);
 402         if (r < 0)
 403                 goto exit;
 404
 405         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 406                                   hdev->init_data.gates);
 407         if (r < 0)
 408                 goto disconnect_all;
 409
 410         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 411                               NFC_HCI_ADMIN_SESSION_IDENTITY,
 412                               hdev->init_data.session_id,
 413                               strlen(hdev->init_data.session_id));
 414         if (r == 0)
 415                 goto exit;
 416
 417 disconnect_all:
 418         nfc_hci_disconnect_all_gates(hdev);
 419
 420 exit:
 421         kfree_skb(skb);
 422
 423         return r;
 424 }
 425
 426 static int hci_dev_version(struct nfc_hci_dev *hdev)
 427 {
 428         int r;
 429         struct sk_buff *skb;
 430
 431         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 432                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 433         if (r == -EOPNOTSUPP) {
 434                 pr_info("Software/Hardware info not available\n");
 435                 return 0;
 436         }
 437         if (r < 0)
 438                 return r;
 439
 440         if (skb->len != 3) {
 441                 kfree_skb(skb);
 442                 return -EINVAL;
 443         }
 444
 445         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 446         hdev->sw_patch = skb->data[0] & 0x0f;
 447         hdev->sw_flashlib_major = skb->data[1];
 448         hdev->sw_flashlib_minor = skb->data[2];
 449
 450         kfree_skb(skb);
 451
 452         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 453                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 454         if (r < 0)
 455                 return r;
 456
 457         if (skb->len != 3) {
 458                 kfree_skb(skb);
 459                 return -EINVAL;
 460         }
 461
 462         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 463         hdev->hw_version = skb->data[0] & 0x1f;
 464         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 465         hdev->hw_software = skb->data[1] & 0x3f;
 466         hdev->hw_bsid = skb->data[2];
 467
 468         kfree_skb(skb);
 469
 470         pr_info("SOFTWARE INFO:\n");
 471         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 472         pr_info("Patch          : %d\n", hdev->sw_patch);
 473         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 474         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 475         pr_info("HARDWARE INFO:\n");
 476         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 477         pr_info("HW Version     : %d\n", hdev->hw_version);
 478         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 479         pr_info("Software       : %d\n", hdev->hw_software);
 480         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 481
 482         return 0;
 483 }
 484
 485 static int hci_dev_up(struct nfc_dev *nfc_dev)
 486 {
 487         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 488         int r = 0;
 489
 490         if (hdev->ops->open) {
 491                 r = hdev->ops->open(hdev);
 492                 if (r < 0)
 493                         return r;
 494         }
 495
 496         r = nfc_llc_start(hdev->llc);
 497         if (r < 0)
 498                 goto exit_close;
 499
 500         r = hci_dev_session_init(hdev);
 501         if (r < 0)
 502                 goto exit_llc;
 503
 504         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 505                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 506         if (r < 0)
 507                 goto exit_llc;
 508
 509         if (hdev->ops->hci_ready) {
 510                 r = hdev->ops->hci_ready(hdev);
 511                 if (r < 0)
 512                         goto exit_llc;
 513         }
 514
 515         r = hci_dev_version(hdev);
 516         if (r < 0)
 517                 goto exit_llc;
 518
 519         return 0;
 520
 521 exit_llc:
 522         nfc_llc_stop(hdev->llc);
 523
 524 exit_close:
 525         if (hdev->ops->close)
 526                 hdev->ops->close(hdev);
 527
 528         return r;
 529 }
 530
 531 static int hci_dev_down(struct nfc_dev *nfc_dev)
 532 {
 533         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 534
 535         nfc_llc_stop(hdev->llc);
 536
 537         if (hdev->ops->close)
 538                 hdev->ops->close(hdev);
 539
 540         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 541
 542         return 0;
 543 }
 544
 545 static int hci_start_poll(struct nfc_dev *nfc_dev,
 546                           u32 im_protocols, u32 tm_protocols)
 547 {
 548         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 549
 550         if (hdev->ops->start_poll)
 551                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 552         else
 553                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 554                                           NFC_HCI_EVT_READER_REQUESTED,
 555                                           NULL, 0);
 556 }
 557
 558 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 559 {
 560         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 561
 562         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 563                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 564 }
 565
 566 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 567                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 568 {
 569         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 570
 571         if (!hdev->ops->dep_link_up)
 572                 return 0;
 573
 574         return hdev->ops->dep_link_up(hdev, target, comm_mode,
 575                                       gb, gb_len);
 576 }
 577
 578 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 579 {
 580         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 581
 582         if (!hdev->ops->dep_link_down)
 583                 return 0;
 584
 585         return hdev->ops->dep_link_down(hdev);
 586 }
 587
 588 static int hci_activate_target(struct nfc_dev *nfc_dev,
 589                                struct nfc_target *target, u32 protocol)
 590 {
 591         return 0;
 592 }
 593
 594 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 595                                   struct nfc_target *target)
 596 {
 597 }
 598
 599 #define HCI_CB_TYPE_TRANSCEIVE 1
 600
 601 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 602 {
 603         struct nfc_hci_dev *hdev = context;
 604
 605         switch (hdev->async_cb_type) {
 606         case HCI_CB_TYPE_TRANSCEIVE:
 607                 /*
 608                  * TODO: Check RF Error indicator to make sure data is valid.
 609                  * It seems that HCI cmd can complete without error, but data
 610                  * can be invalid if an RF error occured? Ignore for now.
 611                  */
 612                 if (err == 0)
 613                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 614
 615                 hdev->async_cb(hdev->async_cb_context, skb, err);
 616                 break;
 617         default:
 618                 if (err == 0)
 619                         kfree_skb(skb);
 620                 break;
 621         }
 622 }
 623
 624 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 625                           struct sk_buff *skb, data_exchange_cb_t cb,
 626                           void *cb_context)
 627 {
 628         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 629         int r;
 630
 631         pr_debug("target_idx=%d\n", target->idx);
 632
 633         switch (target->hci_reader_gate) {
 634         case NFC_HCI_RF_READER_A_GATE:
 635         case NFC_HCI_RF_READER_B_GATE:
 636                 if (hdev->ops->im_transceive) {
 637                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 638                                                      cb_context);
 639                         if (r <= 0)     /* handled */
 640                                 break;
 641                 }
 642
 643                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 644
 645                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 646                 hdev->async_cb = cb;
 647                 hdev->async_cb_context = cb_context;
 648
 649                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 650                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 651                                            skb->len, hci_transceive_cb, hdev);
 652                 break;
 653         default:
 654                 if (hdev->ops->im_transceive) {
 655                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 656                                                      cb_context);
 657                         if (r == 1)
 658                                 r = -ENOTSUPP;
 659                 } else {
 660                         r = -ENOTSUPP;
 661                 }
 662                 break;
 663         }
 664
 665         kfree_skb(skb);
 666
 667         return r;
 668 }
 669
 670 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 671 {
 672         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 673
 674         if (!hdev->ops->tm_send) {
 675                 kfree_skb(skb);
 676                 return -ENOTSUPP;
 677         }
 678
 679         return hdev->ops->tm_send(hdev, skb);
 680 }
 681
 682 static int hci_check_presence(struct nfc_dev *nfc_dev,
 683                               struct nfc_target *target)
 684 {
 685         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 686
 687         if (!hdev->ops->check_presence)
 688                 return 0;
 689
 690         return hdev->ops->check_presence(hdev, target);
 691 }
 692
 693 static int hci_discover_se(struct nfc_dev *nfc_dev)
 694 {
 695         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 696
 697         if (hdev->ops->discover_se)
 698                 return hdev->ops->discover_se(hdev);
 699
 700         return 0;
 701 }
 702
 703 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 704 {
 705         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 706
 707         if (hdev->ops->enable_se)
 708                 return hdev->ops->enable_se(hdev, se_idx);
 709
 710         return 0;
 711 }
 712
 713 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 714 {
 715         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 716
 717         if (hdev->ops->disable_se)
 718                 return hdev->ops->disable_se(hdev, se_idx);
 719
 720         return 0;
 721 }
 722
 723 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 724 {
 725         mutex_lock(&hdev->msg_tx_mutex);
 726
 727         if (hdev->cmd_pending_msg == NULL) {
 728                 nfc_driver_failure(hdev->ndev, err);
 729                 goto exit;
 730         }
 731
 732         __nfc_hci_cmd_completion(hdev, err, NULL);
 733
 734 exit:
 735         mutex_unlock(&hdev->msg_tx_mutex);
 736 }
 737
 738 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 739 {
 740         nfc_hci_failure(hdev, err);
 741 }
 742
 743 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 744 {
 745         struct hcp_packet *packet;
 746         u8 type;
 747         u8 instruction;
 748         struct sk_buff *hcp_skb;
 749         u8 pipe;
 750         struct sk_buff *frag_skb;
 751         int msg_len;
 752
 753         packet = (struct hcp_packet *)skb->data;
 754         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 755                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 756                 return;
 757         }
 758
 759         /* it's the last fragment. Does it need re-aggregation? */
 760         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 761                 pipe = packet->header & NFC_HCI_FRAGMENT;
 762                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 763
 764                 msg_len = 0;
 765                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 766                         msg_len += (frag_skb->len -
 767                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 768                 }
 769
 770                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 771                                              msg_len, GFP_KERNEL);
 772                 if (hcp_skb == NULL) {
 773                         nfc_hci_failure(hdev, -ENOMEM);
 774                         return;
 775                 }
 776
 777                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 778
 779                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 780                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 781                         memcpy(skb_put(hcp_skb, msg_len),
 782                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 783                                msg_len);
 784                 }
 785
 786                 skb_queue_purge(&hdev->rx_hcp_frags);
 787         } else {
 788                 packet->header &= NFC_HCI_FRAGMENT;
 789                 hcp_skb = skb;
 790         }
 791
 792         /* if this is a response, dispatch immediately to
 793          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 794          * in separate context where handler can also execute command.
 795          */
 796         packet = (struct hcp_packet *)hcp_skb->data;
 797         type = HCP_MSG_GET_TYPE(packet->message.header);
 798         if (type == NFC_HCI_HCP_RESPONSE) {
 799                 pipe = packet->header;
 800                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 801                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 802                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 803                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 804         } else {
 805                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 806                 schedule_work(&hdev->msg_rx_work);
 807         }
 808 }
 809
 810 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
 811 {
 812         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 813
 814         if (!hdev->ops->fw_download)
 815                 return -ENOTSUPP;
 816
 817         return hdev->ops->fw_download(hdev, firmware_name);
 818 }
 819
 820 static struct nfc_ops hci_nfc_ops = {
 821         .dev_up = hci_dev_up,
 822         .dev_down = hci_dev_down,
 823         .start_poll = hci_start_poll,
 824         .stop_poll = hci_stop_poll,
 825         .dep_link_up = hci_dep_link_up,
 826         .dep_link_down = hci_dep_link_down,
 827         .activate_target = hci_activate_target,
 828         .deactivate_target = hci_deactivate_target,
 829         .im_transceive = hci_transceive,
 830         .tm_send = hci_tm_send,
 831         .check_presence = hci_check_presence,
 832         .fw_download = hci_fw_download,
 833         .discover_se = hci_discover_se,
 834         .enable_se = hci_enable_se,
 835         .disable_se = hci_disable_se,
 836 };
 837
 838 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 839                                             struct nfc_hci_init_data *init_data,
 840                                             unsigned long quirks,
 841                                             u32 protocols,
 842                                             const char *llc_name,
 843                                             int tx_headroom,
 844                                             int tx_tailroom,
 845                                             int max_link_payload)
 846 {
 847         struct nfc_hci_dev *hdev;
 848
 849         if (ops->xmit == NULL)
 850                 return NULL;
 851
 852         if (protocols == 0)
 853                 return NULL;
 854
 855         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 856         if (hdev == NULL)
 857                 return NULL;
 858
 859         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 860                                      nfc_hci_recv_from_llc, tx_headroom,
 861                                      tx_tailroom, nfc_hci_llc_failure);
 862         if (hdev->llc == NULL) {
 863                 kfree(hdev);
 864                 return NULL;
 865         }
 866
 867         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 868                                          tx_headroom + HCI_CMDS_HEADROOM,
 869                                          tx_tailroom);
 870         if (!hdev->ndev) {
 871                 nfc_llc_free(hdev->llc);
 872                 kfree(hdev);
 873                 return NULL;
 874         }
 875
 876         hdev->ops = ops;
 877         hdev->max_data_link_payload = max_link_payload;
 878         hdev->init_data = *init_data;
 879
 880         nfc_set_drvdata(hdev->ndev, hdev);
 881
 882         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 883
 884         hdev->quirks = quirks;
 885
 886         return hdev;
 887 }
 888 EXPORT_SYMBOL(nfc_hci_allocate_device);
 889
 890 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 891 {
 892         nfc_free_device(hdev->ndev);
 893         nfc_llc_free(hdev->llc);
 894         kfree(hdev);
 895 }
 896 EXPORT_SYMBOL(nfc_hci_free_device);
 897
 898 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
 899 {
 900         mutex_init(&hdev->msg_tx_mutex);
 901
 902         INIT_LIST_HEAD(&hdev->msg_tx_queue);
 903
 904         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
 905
 906         init_timer(&hdev->cmd_timer);
 907         hdev->cmd_timer.data = (unsigned long)hdev;
 908         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
 909
 910         skb_queue_head_init(&hdev->rx_hcp_frags);
 911
 912         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
 913
 914         skb_queue_head_init(&hdev->msg_rx_queue);
 915
 916         return nfc_register_device(hdev->ndev);
 917 }
 918 EXPORT_SYMBOL(nfc_hci_register_device);
 919
 920 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
 921 {
 922         struct hci_msg *msg, *n;
 923
 924         mutex_lock(&hdev->msg_tx_mutex);
 925
 926         if (hdev->cmd_pending_msg) {
 927                 if (hdev->cmd_pending_msg->cb)
 928                         hdev->cmd_pending_msg->cb(
 929                                              hdev->cmd_pending_msg->cb_context,
 930                                              NULL, -ESHUTDOWN);
 931                 kfree(hdev->cmd_pending_msg);
 932                 hdev->cmd_pending_msg = NULL;
 933         }
 934
 935         hdev->shutting_down = true;
 936
 937         mutex_unlock(&hdev->msg_tx_mutex);
 938
 939         del_timer_sync(&hdev->cmd_timer);
 940         cancel_work_sync(&hdev->msg_tx_work);
 941
 942         cancel_work_sync(&hdev->msg_rx_work);
 943
 944         nfc_unregister_device(hdev->ndev);
 945
 946         skb_queue_purge(&hdev->rx_hcp_frags);
 947         skb_queue_purge(&hdev->msg_rx_queue);
 948
 949         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
 950                 list_del(&msg->msg_l);
 951                 skb_queue_purge(&msg->msg_frags);
 952                 kfree(msg);
 953         }
 954 }
 955 EXPORT_SYMBOL(nfc_hci_unregister_device);
 956
 957 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
 958 {
 959         hdev->clientdata = clientdata;
 960 }
 961 EXPORT_SYMBOL(nfc_hci_set_clientdata);
 962
 963 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
 964 {
 965         return hdev->clientdata;
 966 }
 967 EXPORT_SYMBOL(nfc_hci_get_clientdata);
 968
 969 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
 970 {
 971         nfc_hci_failure(hdev, err);
 972 }
 973 EXPORT_SYMBOL(nfc_hci_driver_failure);
 974
 975 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 976 {
 977         nfc_llc_rcv_from_drv(hdev->llc, skb);
 978 }
 979 EXPORT_SYMBOL(nfc_hci_recv_frame);
 980
 981 static int __init nfc_hci_init(void)
 982 {
 983         return nfc_llc_init();
 984 }
 985
 986 static void __exit nfc_hci_exit(void)
 987 {
 988         nfc_llc_exit();
 989 }
 990
 991 subsys_initcall(nfc_hci_init);
 992 module_exit(nfc_hci_exit);
 993
 994 MODULE_LICENSE("GPL");
 995 MODULE_DESCRIPTION("NFC HCI Core");