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
  30 #include "hci.h"
  31
  32 /* Largest headroom needed for outgoing HCI commands */
  33 #define HCI_CMDS_HEADROOM 1
  34
  35 static int nfc_hci_result_to_errno(u8 result)
  36 {
  37         switch (result) {
  38         case NFC_HCI_ANY_OK:
  39                 return 0;
  40         case NFC_HCI_ANY_E_TIMEOUT:
  41                 return -ETIME;
  42         default:
  43                 return -1;
  44         }
  45 }
  46
  47 static void nfc_hci_msg_tx_work(struct work_struct *work)
  48 {
  49         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
  50                                                 msg_tx_work);
  51         struct hci_msg *msg;
  52         struct sk_buff *skb;
  53         int r = 0;
  54
  55         mutex_lock(&hdev->msg_tx_mutex);
  56
  57         if (hdev->cmd_pending_msg) {
  58                 if (timer_pending(&hdev->cmd_timer) == 0) {
  59                         if (hdev->cmd_pending_msg->cb)
  60                                 hdev->cmd_pending_msg->cb(hdev,
  61                                                           -ETIME,
  62                                                           NULL,
  63                                                           hdev->
  64                                                           cmd_pending_msg->
  65                                                           cb_context);
  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 = hdev->ops->xmit(hdev, skb);
  82                 if (r < 0) {
  83                         kfree_skb(skb);
  84                         skb_queue_purge(&msg->msg_frags);
  85                         if (msg->cb)
  86                                 msg->cb(hdev, r, NULL, msg->cb_context);
  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, err, skb,
 137                                           hdev->cmd_pending_msg->cb_context);
 138         else
 139                 kfree_skb(skb);
 140
 141         kfree(hdev->cmd_pending_msg);
 142         hdev->cmd_pending_msg = NULL;
 143
 144         queue_work(hdev->msg_tx_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(hdev->msg_tx_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         if (skb)
 402                 kfree_skb(skb);
 403
 404         return r;
 405 }
 406
 407 static int hci_dev_version(struct nfc_hci_dev *hdev)
 408 {
 409         int r;
 410         struct sk_buff *skb;
 411
 412         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 413                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 414         if (r < 0)
 415                 return r;
 416
 417         if (skb->len != 3) {
 418                 kfree_skb(skb);
 419                 return -EINVAL;
 420         }
 421
 422         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 423         hdev->sw_patch = skb->data[0] & 0x0f;
 424         hdev->sw_flashlib_major = skb->data[1];
 425         hdev->sw_flashlib_minor = skb->data[2];
 426
 427         kfree_skb(skb);
 428
 429         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 430                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 431         if (r < 0)
 432                 return r;
 433
 434         if (skb->len != 3) {
 435                 kfree_skb(skb);
 436                 return -EINVAL;
 437         }
 438
 439         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 440         hdev->hw_version = skb->data[0] & 0x1f;
 441         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 442         hdev->hw_software = skb->data[1] & 0x3f;
 443         hdev->hw_bsid = skb->data[2];
 444
 445         kfree_skb(skb);
 446
 447         pr_info("SOFTWARE INFO:\n");
 448         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 449         pr_info("Patch          : %d\n", hdev->sw_patch);
 450         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 451         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 452         pr_info("HARDWARE INFO:\n");
 453         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 454         pr_info("HW Version     : %d\n", hdev->hw_version);
 455         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 456         pr_info("Software       : %d\n", hdev->hw_software);
 457         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 458
 459         return 0;
 460 }
 461
 462 static int hci_dev_up(struct nfc_dev *nfc_dev)
 463 {
 464         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 465         int r = 0;
 466
 467         if (hdev->ops->open) {
 468                 r = hdev->ops->open(hdev);
 469                 if (r < 0)
 470                         return r;
 471         }
 472
 473         r = hci_dev_session_init(hdev);
 474         if (r < 0)
 475                 goto exit;
 476
 477         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 478                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 479         if (r < 0)
 480                 goto exit;
 481
 482         if (hdev->ops->hci_ready) {
 483                 r = hdev->ops->hci_ready(hdev);
 484                 if (r < 0)
 485                         goto exit;
 486         }
 487
 488         r = hci_dev_version(hdev);
 489         if (r < 0)
 490                 goto exit;
 491
 492 exit:
 493         if (r < 0)
 494                 if (hdev->ops->close)
 495                         hdev->ops->close(hdev);
 496         return r;
 497 }
 498
 499 static int hci_dev_down(struct nfc_dev *nfc_dev)
 500 {
 501         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 502
 503         if (hdev->ops->close)
 504                 hdev->ops->close(hdev);
 505
 506         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 507
 508         return 0;
 509 }
 510
 511 static int hci_start_poll(struct nfc_dev *nfc_dev,
 512                           u32 im_protocols, u32 tm_protocols)
 513 {
 514         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 515
 516         if (hdev->ops->start_poll)
 517                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 518         else
 519                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 520                                        NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
 521 }
 522
 523 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 524 {
 525         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 526
 527         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 528                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 529 }
 530
 531 static int hci_activate_target(struct nfc_dev *nfc_dev,
 532                                struct nfc_target *target, u32 protocol)
 533 {
 534         return 0;
 535 }
 536
 537 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 538                                   struct nfc_target *target)
 539 {
 540 }
 541
 542 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 543                           struct sk_buff *skb, data_exchange_cb_t cb,
 544                           void *cb_context)
 545 {
 546         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 547         int r;
 548         struct sk_buff *res_skb = NULL;
 549
 550         pr_debug("target_idx=%d\n", target->idx);
 551
 552         switch (target->hci_reader_gate) {
 553         case NFC_HCI_RF_READER_A_GATE:
 554         case NFC_HCI_RF_READER_B_GATE:
 555                 if (hdev->ops->data_exchange) {
 556                         r = hdev->ops->data_exchange(hdev, target, skb,
 557                                                      &res_skb);
 558                         if (r <= 0)     /* handled */
 559                                 break;
 560                 }
 561
 562                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 563                 r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 564                                      NFC_HCI_WR_XCHG_DATA,
 565                                      skb->data, skb->len, &res_skb);
 566                 /*
 567                  * TODO: Check RF Error indicator to make sure data is valid.
 568                  * It seems that HCI cmd can complete without error, but data
 569                  * can be invalid if an RF error occured? Ignore for now.
 570                  */
 571                 if (r == 0)
 572                         skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */
 573                 break;
 574         default:
 575                 if (hdev->ops->data_exchange) {
 576                         r = hdev->ops->data_exchange(hdev, target, skb,
 577                                                      &res_skb);
 578                         if (r == 1)
 579                                 r = -ENOTSUPP;
 580                 }
 581                 else
 582                         r = -ENOTSUPP;
 583         }
 584
 585         kfree_skb(skb);
 586
 587         cb(cb_context, res_skb, r);
 588
 589         return 0;
 590 }
 591
 592 static int hci_check_presence(struct nfc_dev *nfc_dev,
 593                               struct nfc_target *target)
 594 {
 595         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 596
 597         if (hdev->ops->check_presence)
 598                 return hdev->ops->check_presence(hdev, target);
 599
 600         return 0;
 601 }
 602
 603 static struct nfc_ops hci_nfc_ops = {
 604         .dev_up = hci_dev_up,
 605         .dev_down = hci_dev_down,
 606         .start_poll = hci_start_poll,
 607         .stop_poll = hci_stop_poll,
 608         .activate_target = hci_activate_target,
 609         .deactivate_target = hci_deactivate_target,
 610         .im_transceive = hci_transceive,
 611         .check_presence = hci_check_presence,
 612 };
 613
 614 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 615                                             struct nfc_hci_init_data *init_data,
 616                                             u32 protocols,
 617                                             int tx_headroom,
 618                                             int tx_tailroom,
 619                                             int max_link_payload)
 620 {
 621         struct nfc_hci_dev *hdev;
 622
 623         if (ops->xmit == NULL)
 624                 return NULL;
 625
 626         if (protocols == 0)
 627                 return NULL;
 628
 629         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 630         if (hdev == NULL)
 631                 return NULL;
 632
 633         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 634                                          tx_headroom + HCI_CMDS_HEADROOM,
 635                                          tx_tailroom);
 636         if (!hdev->ndev) {
 637                 kfree(hdev);
 638                 return NULL;
 639         }
 640
 641         hdev->ops = ops;
 642         hdev->max_data_link_payload = max_link_payload;
 643         hdev->init_data = *init_data;
 644
 645         nfc_set_drvdata(hdev->ndev, hdev);
 646
 647         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 648
 649         return hdev;
 650 }
 651 EXPORT_SYMBOL(nfc_hci_allocate_device);
 652
 653 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 654 {
 655         nfc_free_device(hdev->ndev);
 656         kfree(hdev);
 657 }
 658 EXPORT_SYMBOL(nfc_hci_free_device);
 659
 660 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
 661 {
 662         struct device *dev = &hdev->ndev->dev;
 663         const char *devname = dev_name(dev);
 664         char name[32];
 665         int r = 0;
 666
 667         mutex_init(&hdev->msg_tx_mutex);
 668
 669         INIT_LIST_HEAD(&hdev->msg_tx_queue);
 670
 671         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
 672         snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname);
 673         hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
 674                                           WQ_MEM_RECLAIM, 1);
 675         if (hdev->msg_tx_wq == NULL) {
 676                 r = -ENOMEM;
 677                 goto exit;
 678         }
 679
 680         init_timer(&hdev->cmd_timer);
 681         hdev->cmd_timer.data = (unsigned long)hdev;
 682         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
 683
 684         skb_queue_head_init(&hdev->rx_hcp_frags);
 685
 686         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
 687         snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname);
 688         hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
 689                                           WQ_MEM_RECLAIM, 1);
 690         if (hdev->msg_rx_wq == NULL) {
 691                 r = -ENOMEM;
 692                 goto exit;
 693         }
 694
 695         skb_queue_head_init(&hdev->msg_rx_queue);
 696
 697         r = nfc_register_device(hdev->ndev);
 698
 699 exit:
 700         if (r < 0) {
 701                 if (hdev->msg_tx_wq)
 702                         destroy_workqueue(hdev->msg_tx_wq);
 703                 if (hdev->msg_rx_wq)
 704                         destroy_workqueue(hdev->msg_rx_wq);
 705         }
 706
 707         return r;
 708 }
 709 EXPORT_SYMBOL(nfc_hci_register_device);
 710
 711 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
 712 {
 713         struct hci_msg *msg, *n;
 714
 715         skb_queue_purge(&hdev->rx_hcp_frags);
 716         skb_queue_purge(&hdev->msg_rx_queue);
 717
 718         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
 719                 list_del(&msg->msg_l);
 720                 skb_queue_purge(&msg->msg_frags);
 721                 kfree(msg);
 722         }
 723
 724         del_timer_sync(&hdev->cmd_timer);
 725
 726         nfc_unregister_device(hdev->ndev);
 727
 728         destroy_workqueue(hdev->msg_tx_wq);
 729
 730         destroy_workqueue(hdev->msg_rx_wq);
 731 }
 732 EXPORT_SYMBOL(nfc_hci_unregister_device);
 733
 734 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
 735 {
 736         hdev->clientdata = clientdata;
 737 }
 738 EXPORT_SYMBOL(nfc_hci_set_clientdata);
 739
 740 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
 741 {
 742         return hdev->clientdata;
 743 }
 744 EXPORT_SYMBOL(nfc_hci_get_clientdata);
 745
 746 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 747 {
 748         mutex_lock(&hdev->msg_tx_mutex);
 749
 750         if (hdev->cmd_pending_msg == NULL) {
 751                 nfc_driver_failure(hdev->ndev, err);
 752                 goto exit;
 753         }
 754
 755         __nfc_hci_cmd_completion(hdev, err, NULL);
 756
 757 exit:
 758         mutex_unlock(&hdev->msg_tx_mutex);
 759 }
 760
 761 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
 762 {
 763         nfc_hci_failure(hdev, err);
 764 }
 765 EXPORT_SYMBOL(nfc_hci_driver_failure);
 766
 767 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 768 {
 769         struct hcp_packet *packet;
 770         u8 type;
 771         u8 instruction;
 772         struct sk_buff *hcp_skb;
 773         u8 pipe;
 774         struct sk_buff *frag_skb;
 775         int msg_len;
 776
 777         packet = (struct hcp_packet *)skb->data;
 778         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 779                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 780                 return;
 781         }
 782
 783         /* it's the last fragment. Does it need re-aggregation? */
 784         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 785                 pipe = packet->header & NFC_HCI_FRAGMENT;
 786                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 787
 788                 msg_len = 0;
 789                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 790                         msg_len += (frag_skb->len -
 791                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 792                 }
 793
 794                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 795                                              msg_len, GFP_KERNEL);
 796                 if (hcp_skb == NULL) {
 797                         nfc_hci_failure(hdev, -ENOMEM);
 798                         return;
 799                 }
 800
 801                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 802
 803                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 804                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 805                         memcpy(skb_put(hcp_skb, msg_len),
 806                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 807                                msg_len);
 808                 }
 809
 810                 skb_queue_purge(&hdev->rx_hcp_frags);
 811         } else {
 812                 packet->header &= NFC_HCI_FRAGMENT;
 813                 hcp_skb = skb;
 814         }
 815
 816         /* if this is a response, dispatch immediately to
 817          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 818          * in separate context where handler can also execute command.
 819          */
 820         packet = (struct hcp_packet *)hcp_skb->data;
 821         type = HCP_MSG_GET_TYPE(packet->message.header);
 822         if (type == NFC_HCI_HCP_RESPONSE) {
 823                 pipe = packet->header;
 824                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 825                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 826                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 827                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 828         } else {
 829                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 830                 queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work);
 831         }
 832 }
 833 EXPORT_SYMBOL(nfc_hci_recv_frame);
 834
 835 MODULE_LICENSE("GPL");