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