kernel/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 void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
  50 {
  51         int i = 0;
  52
  53         for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
  54                 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
  55                 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
  56         }
  57         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
  58 }
  59 EXPORT_SYMBOL(nfc_hci_reset_pipes);
  60
  61 void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
  62 {
  63         int i = 0;
  64
  65         for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
  66                 if (hdev->pipes[i].dest_host != host)
  67                         continue;
  68
  69                 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
  70                 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
  71         }
  72 }
  73 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
  74
  75 static void nfc_hci_msg_tx_work(struct work_struct *work)
  76 {
  77         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
  78                                                 msg_tx_work);
  79         struct hci_msg *msg;
  80         struct sk_buff *skb;
  81         int r = 0;
  82
  83         mutex_lock(&hdev->msg_tx_mutex);
  84         if (hdev->shutting_down)
  85                 goto exit;
  86
  87         if (hdev->cmd_pending_msg) {
  88                 if (timer_pending(&hdev->cmd_timer) == 0) {
  89                         if (hdev->cmd_pending_msg->cb)
  90                                 hdev->cmd_pending_msg->cb(hdev->
  91                                                           cmd_pending_msg->
  92                                                           cb_context,
  93                                                           NULL,
  94                                                           -ETIME);
  95                         kfree(hdev->cmd_pending_msg);
  96                         hdev->cmd_pending_msg = NULL;
  97                 } else {
  98                         goto exit;
  99                 }
 100         }
 101
 102 next_msg:
 103         if (list_empty(&hdev->msg_tx_queue))
 104                 goto exit;
 105
 106         msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
 107         list_del(&msg->msg_l);
 108
 109         pr_debug("msg_tx_queue has a cmd to send\n");
 110         while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
 111                 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
 112                 if (r < 0) {
 113                         kfree_skb(skb);
 114                         skb_queue_purge(&msg->msg_frags);
 115                         if (msg->cb)
 116                                 msg->cb(msg->cb_context, NULL, r);
 117                         kfree(msg);
 118                         break;
 119                 }
 120         }
 121
 122         if (r)
 123                 goto next_msg;
 124
 125         if (msg->wait_response == false) {
 126                 kfree(msg);
 127                 goto next_msg;
 128         }
 129
 130         hdev->cmd_pending_msg = msg;
 131         mod_timer(&hdev->cmd_timer, jiffies +
 132                   msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
 133
 134 exit:
 135         mutex_unlock(&hdev->msg_tx_mutex);
 136 }
 137
 138 static void nfc_hci_msg_rx_work(struct work_struct *work)
 139 {
 140         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 141                                                 msg_rx_work);
 142         struct sk_buff *skb;
 143         struct hcp_message *message;
 144         u8 pipe;
 145         u8 type;
 146         u8 instruction;
 147
 148         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 149                 pipe = skb->data[0];
 150                 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
 151                 message = (struct hcp_message *)skb->data;
 152                 type = HCP_MSG_GET_TYPE(message->header);
 153                 instruction = HCP_MSG_GET_CMD(message->header);
 154                 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 155
 156                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
 157         }
 158 }
 159
 160 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
 161                                      struct sk_buff *skb)
 162 {
 163         del_timer_sync(&hdev->cmd_timer);
 164
 165         if (hdev->cmd_pending_msg->cb)
 166                 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
 167                                           skb, err);
 168         else
 169                 kfree_skb(skb);
 170
 171         kfree(hdev->cmd_pending_msg);
 172         hdev->cmd_pending_msg = NULL;
 173
 174         schedule_work(&hdev->msg_tx_work);
 175 }
 176
 177 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
 178                            struct sk_buff *skb)
 179 {
 180         mutex_lock(&hdev->msg_tx_mutex);
 181
 182         if (hdev->cmd_pending_msg == NULL) {
 183                 kfree_skb(skb);
 184                 goto exit;
 185         }
 186
 187         __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
 188
 189 exit:
 190         mutex_unlock(&hdev->msg_tx_mutex);
 191 }
 192
 193 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 194                           struct sk_buff *skb)
 195 {
 196         u8 gate = hdev->pipes[pipe].gate;
 197         u8 status = NFC_HCI_ANY_OK;
 198         struct hci_create_pipe_resp *create_info;
 199         struct hci_delete_pipe_noti *delete_info;
 200         struct hci_all_pipe_cleared_noti *cleared_info;
 201
 202         pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
 203
 204         switch (cmd) {
 205         case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
 206                 if (skb->len != 5) {
 207                         status = NFC_HCI_ANY_E_NOK;
 208                         goto exit;
 209                 }
 210                 create_info = (struct hci_create_pipe_resp *)skb->data;
 211
 212                 /* Save the new created pipe and bind with local gate,
 213                  * the description for skb->data[3] is destination gate id
 214                  * but since we received this cmd from host controller, we
 215                  * are the destination and it is our local gate
 216                  */
 217                 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
 218                 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
 219                 hdev->pipes[create_info->pipe].dest_host =
 220                                                         create_info->src_host;
 221                 break;
 222         case NFC_HCI_ANY_OPEN_PIPE:
 223                 if (gate == NFC_HCI_INVALID_GATE) {
 224                         status = NFC_HCI_ANY_E_NOK;
 225                         goto exit;
 226                 }
 227                 break;
 228         case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
 229                 if (skb->len != 1) {
 230                         status = NFC_HCI_ANY_E_NOK;
 231                         goto exit;
 232                 }
 233                 delete_info = (struct hci_delete_pipe_noti *)skb->data;
 234
 235                 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
 236                 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
 237                 break;
 238         case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 239                 if (skb->len != 1) {
 240                         status = NFC_HCI_ANY_E_NOK;
 241                         goto exit;
 242                 }
 243                 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
 244
 245                 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
 246                 break;
 247         default:
 248                 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 249                 break;
 250         }
 251
 252         if (hdev->ops->cmd_received)
 253                 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
 254
 255 exit:
 256         nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
 257                                status, NULL, 0, NULL, NULL, 0);
 258
 259         kfree_skb(skb);
 260 }
 261
 262 u32 nfc_hci_sak_to_protocol(u8 sak)
 263 {
 264         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
 265         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
 266                 return NFC_PROTO_MIFARE_MASK;
 267         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
 268                 return NFC_PROTO_ISO14443_MASK;
 269         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
 270                 return NFC_PROTO_NFC_DEP_MASK;
 271         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
 272                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
 273         default:
 274                 return 0xffffffff;
 275         }
 276 }
 277 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
 278
 279 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
 280 {
 281         struct nfc_target *targets;
 282         struct sk_buff *atqa_skb = NULL;
 283         struct sk_buff *sak_skb = NULL;
 284         struct sk_buff *uid_skb = NULL;
 285         int r;
 286
 287         pr_debug("from gate %d\n", gate);
 288
 289         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 290         if (targets == NULL)
 291                 return -ENOMEM;
 292
 293         switch (gate) {
 294         case NFC_HCI_RF_READER_A_GATE:
 295                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 296                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
 297                 if (r < 0)
 298                         goto exit;
 299
 300                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 301                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
 302                 if (r < 0)
 303                         goto exit;
 304
 305                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
 306                         r = -EPROTO;
 307                         goto exit;
 308                 }
 309
 310                 targets->supported_protocols =
 311                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
 312                 if (targets->supported_protocols == 0xffffffff) {
 313                         r = -EPROTO;
 314                         goto exit;
 315                 }
 316
 317                 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
 318                 targets->sel_res = sak_skb->data[0];
 319
 320                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 321                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
 322                 if (r < 0)
 323                         goto exit;
 324
 325                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 326                         r = -EPROTO;
 327                         goto exit;
 328                 }
 329
 330                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
 331                 targets->nfcid1_len = uid_skb->len;
 332
 333                 if (hdev->ops->complete_target_discovered) {
 334                         r = hdev->ops->complete_target_discovered(hdev, gate,
 335                                                                   targets);
 336                         if (r < 0)
 337                                 goto exit;
 338                 }
 339                 break;
 340         case NFC_HCI_RF_READER_B_GATE:
 341                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 342                 break;
 343         default:
 344                 if (hdev->ops->target_from_gate)
 345                         r = hdev->ops->target_from_gate(hdev, gate, targets);
 346                 else
 347                         r = -EPROTO;
 348                 if (r < 0)
 349                         goto exit;
 350
 351                 if (hdev->ops->complete_target_discovered) {
 352                         r = hdev->ops->complete_target_discovered(hdev, gate,
 353                                                                   targets);
 354                         if (r < 0)
 355                                 goto exit;
 356                 }
 357                 break;
 358         }
 359
 360         /* if driver set the new gate, we will skip the old one */
 361         if (targets->hci_reader_gate == 0x00)
 362                 targets->hci_reader_gate = gate;
 363
 364         r = nfc_targets_found(hdev->ndev, targets, 1);
 365
 366 exit:
 367         kfree(targets);
 368         kfree_skb(atqa_skb);
 369         kfree_skb(sak_skb);
 370         kfree_skb(uid_skb);
 371
 372         return r;
 373 }
 374 EXPORT_SYMBOL(nfc_hci_target_discovered);
 375
 376 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 377                             struct sk_buff *skb)
 378 {
 379         int r = 0;
 380         u8 gate = hdev->pipes[pipe].gate;
 381
 382         if (gate == NFC_HCI_INVALID_GATE) {
 383                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
 384                 goto exit;
 385         }
 386
 387         if (hdev->ops->event_received) {
 388                 r = hdev->ops->event_received(hdev, pipe, event, skb);
 389                 if (r <= 0)
 390                         goto exit_noskb;
 391         }
 392
 393         switch (event) {
 394         case NFC_HCI_EVT_TARGET_DISCOVERED:
 395                 if (skb->len < 1) {     /* no status data? */
 396                         r = -EPROTO;
 397                         goto exit;
 398                 }
 399
 400                 if (skb->data[0] == 3) {
 401                         /* TODO: Multiple targets in field, none activated
 402                          * poll is supposedly stopped, but there is no
 403                          * single target to activate, so nothing to report
 404                          * up.
 405                          * if we need to restart poll, we must save the
 406                          * protocols from the initial poll and reuse here.
 407                          */
 408                 }
 409
 410                 if (skb->data[0] != 0) {
 411                         r = -EPROTO;
 412                         goto exit;
 413                 }
 414
 415                 r = nfc_hci_target_discovered(hdev, gate);
 416                 break;
 417         default:
 418                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
 419                 r = -EINVAL;
 420                 break;
 421         }
 422
 423 exit:
 424         kfree_skb(skb);
 425
 426 exit_noskb:
 427         if (r)
 428                 nfc_hci_driver_failure(hdev, r);
 429 }
 430
 431 static void nfc_hci_cmd_timeout(unsigned long data)
 432 {
 433         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
 434
 435         schedule_work(&hdev->msg_tx_work);
 436 }
 437
 438 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 439                                  struct nfc_hci_gate *gates)
 440 {
 441         int r;
 442         while (gate_count--) {
 443                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 444                                          gates->gate, gates->pipe);
 445                 if (r < 0)
 446                         return r;
 447                 gates++;
 448         }
 449
 450         return 0;
 451 }
 452
 453 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 454 {
 455         struct sk_buff *skb = NULL;
 456         int r;
 457
 458         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 459                 return -EPROTO;
 460
 461         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 462                                  hdev->init_data.gates[0].gate,
 463                                  hdev->init_data.gates[0].pipe);
 464         if (r < 0)
 465                 goto exit;
 466
 467         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 468                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 469         if (r < 0)
 470                 goto disconnect_all;
 471
 472         if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
 473                 (memcmp(hdev->init_data.session_id, skb->data,
 474                            skb->len) == 0) && hdev->ops->load_session) {
 475                 /* Restore gate<->pipe table from some proprietary location. */
 476
 477                 r = hdev->ops->load_session(hdev);
 478
 479                 if (r < 0)
 480                         goto disconnect_all;
 481         } else {
 482
 483                 r = nfc_hci_disconnect_all_gates(hdev);
 484                 if (r < 0)
 485                         goto exit;
 486
 487                 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 488                                           hdev->init_data.gates);
 489                 if (r < 0)
 490                         goto disconnect_all;
 491
 492                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 493                                 NFC_HCI_ADMIN_SESSION_IDENTITY,
 494                                 hdev->init_data.session_id,
 495                                 strlen(hdev->init_data.session_id));
 496         }
 497         if (r == 0)
 498                 goto exit;
 499
 500 disconnect_all:
 501         nfc_hci_disconnect_all_gates(hdev);
 502
 503 exit:
 504         kfree_skb(skb);
 505
 506         return r;
 507 }
 508
 509 static int hci_dev_version(struct nfc_hci_dev *hdev)
 510 {
 511         int r;
 512         struct sk_buff *skb;
 513
 514         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 515                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 516         if (r == -EOPNOTSUPP) {
 517                 pr_info("Software/Hardware info not available\n");
 518                 return 0;
 519         }
 520         if (r < 0)
 521                 return r;
 522
 523         if (skb->len != 3) {
 524                 kfree_skb(skb);
 525                 return -EINVAL;
 526         }
 527
 528         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 529         hdev->sw_patch = skb->data[0] & 0x0f;
 530         hdev->sw_flashlib_major = skb->data[1];
 531         hdev->sw_flashlib_minor = skb->data[2];
 532
 533         kfree_skb(skb);
 534
 535         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 536                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 537         if (r < 0)
 538                 return r;
 539
 540         if (skb->len != 3) {
 541                 kfree_skb(skb);
 542                 return -EINVAL;
 543         }
 544
 545         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 546         hdev->hw_version = skb->data[0] & 0x1f;
 547         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 548         hdev->hw_software = skb->data[1] & 0x3f;
 549         hdev->hw_bsid = skb->data[2];
 550
 551         kfree_skb(skb);
 552
 553         pr_info("SOFTWARE INFO:\n");
 554         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 555         pr_info("Patch          : %d\n", hdev->sw_patch);
 556         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 557         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 558         pr_info("HARDWARE INFO:\n");
 559         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 560         pr_info("HW Version     : %d\n", hdev->hw_version);
 561         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 562         pr_info("Software       : %d\n", hdev->hw_software);
 563         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 564
 565         return 0;
 566 }
 567
 568 static int hci_dev_up(struct nfc_dev *nfc_dev)
 569 {
 570         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 571         int r = 0;
 572
 573         if (hdev->ops->open) {
 574                 r = hdev->ops->open(hdev);
 575                 if (r < 0)
 576                         return r;
 577         }
 578
 579         r = nfc_llc_start(hdev->llc);
 580         if (r < 0)
 581                 goto exit_close;
 582
 583         r = hci_dev_session_init(hdev);
 584         if (r < 0)
 585                 goto exit_llc;
 586
 587         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 588                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 589         if (r < 0)
 590                 goto exit_llc;
 591
 592         if (hdev->ops->hci_ready) {
 593                 r = hdev->ops->hci_ready(hdev);
 594                 if (r < 0)
 595                         goto exit_llc;
 596         }
 597
 598         r = hci_dev_version(hdev);
 599         if (r < 0)
 600                 goto exit_llc;
 601
 602         return 0;
 603
 604 exit_llc:
 605         nfc_llc_stop(hdev->llc);
 606
 607 exit_close:
 608         if (hdev->ops->close)
 609                 hdev->ops->close(hdev);
 610
 611         return r;
 612 }
 613
 614 static int hci_dev_down(struct nfc_dev *nfc_dev)
 615 {
 616         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 617
 618         nfc_llc_stop(hdev->llc);
 619
 620         if (hdev->ops->close)
 621                 hdev->ops->close(hdev);
 622
 623         nfc_hci_reset_pipes(hdev);
 624
 625         return 0;
 626 }
 627
 628 static int hci_start_poll(struct nfc_dev *nfc_dev,
 629                           u32 im_protocols, u32 tm_protocols)
 630 {
 631         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 632
 633         if (hdev->ops->start_poll)
 634                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 635         else
 636                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 637                                           NFC_HCI_EVT_READER_REQUESTED,
 638                                           NULL, 0);
 639 }
 640
 641 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 642 {
 643         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 644
 645         if (hdev->ops->stop_poll)
 646                 hdev->ops->stop_poll(hdev);
 647         else
 648                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 649                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
 650 }
 651
 652 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 653                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 654 {
 655         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 656
 657         if (!hdev->ops->dep_link_up)
 658                 return 0;
 659
 660         return hdev->ops->dep_link_up(hdev, target, comm_mode,
 661                                       gb, gb_len);
 662 }
 663
 664 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 665 {
 666         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 667
 668         if (!hdev->ops->dep_link_down)
 669                 return 0;
 670
 671         return hdev->ops->dep_link_down(hdev);
 672 }
 673
 674 static int hci_activate_target(struct nfc_dev *nfc_dev,
 675                                struct nfc_target *target, u32 protocol)
 676 {
 677         return 0;
 678 }
 679
 680 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 681                                   struct nfc_target *target,
 682                                   u8 mode)
 683 {
 684 }
 685
 686 #define HCI_CB_TYPE_TRANSCEIVE 1
 687
 688 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 689 {
 690         struct nfc_hci_dev *hdev = context;
 691
 692         switch (hdev->async_cb_type) {
 693         case HCI_CB_TYPE_TRANSCEIVE:
 694                 /*
 695                  * TODO: Check RF Error indicator to make sure data is valid.
 696                  * It seems that HCI cmd can complete without error, but data
 697                  * can be invalid if an RF error occured? Ignore for now.
 698                  */
 699                 if (err == 0)
 700                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 701
 702                 hdev->async_cb(hdev->async_cb_context, skb, err);
 703                 break;
 704         default:
 705                 if (err == 0)
 706                         kfree_skb(skb);
 707                 break;
 708         }
 709 }
 710
 711 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 712                           struct sk_buff *skb, data_exchange_cb_t cb,
 713                           void *cb_context)
 714 {
 715         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 716         int r;
 717
 718         pr_debug("target_idx=%d\n", target->idx);
 719
 720         switch (target->hci_reader_gate) {
 721         case NFC_HCI_RF_READER_A_GATE:
 722         case NFC_HCI_RF_READER_B_GATE:
 723                 if (hdev->ops->im_transceive) {
 724                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 725                                                      cb_context);
 726                         if (r <= 0)     /* handled */
 727                                 break;
 728                 }
 729
 730                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 731
 732                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 733                 hdev->async_cb = cb;
 734                 hdev->async_cb_context = cb_context;
 735
 736                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 737                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 738                                            skb->len, hci_transceive_cb, hdev);
 739                 break;
 740         default:
 741                 if (hdev->ops->im_transceive) {
 742                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 743                                                      cb_context);
 744                         if (r == 1)
 745                                 r = -ENOTSUPP;
 746                 } else {
 747                         r = -ENOTSUPP;
 748                 }
 749                 break;
 750         }
 751
 752         kfree_skb(skb);
 753
 754         return r;
 755 }
 756
 757 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 758 {
 759         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 760
 761         if (!hdev->ops->tm_send) {
 762                 kfree_skb(skb);
 763                 return -ENOTSUPP;
 764         }
 765
 766         return hdev->ops->tm_send(hdev, skb);
 767 }
 768
 769 static int hci_check_presence(struct nfc_dev *nfc_dev,
 770                               struct nfc_target *target)
 771 {
 772         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 773
 774         if (!hdev->ops->check_presence)
 775                 return 0;
 776
 777         return hdev->ops->check_presence(hdev, target);
 778 }
 779
 780 static int hci_discover_se(struct nfc_dev *nfc_dev)
 781 {
 782         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 783
 784         if (hdev->ops->discover_se)
 785                 return hdev->ops->discover_se(hdev);
 786
 787         return 0;
 788 }
 789
 790 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 791 {
 792         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 793
 794         if (hdev->ops->enable_se)
 795                 return hdev->ops->enable_se(hdev, se_idx);
 796
 797         return 0;
 798 }
 799
 800 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 801 {
 802         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 803
 804         if (hdev->ops->disable_se)
 805                 return hdev->ops->disable_se(hdev, se_idx);
 806
 807         return 0;
 808 }
 809
 810 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
 811                      u8 *apdu, size_t apdu_length,
 812                      se_io_cb_t cb, void *cb_context)
 813 {
 814         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 815
 816         if (hdev->ops->se_io)
 817                 return hdev->ops->se_io(hdev, se_idx, apdu,
 818                                         apdu_length, cb, cb_context);
 819
 820         return 0;
 821 }
 822
 823 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 824 {
 825         mutex_lock(&hdev->msg_tx_mutex);
 826
 827         if (hdev->cmd_pending_msg == NULL) {
 828                 nfc_driver_failure(hdev->ndev, err);
 829                 goto exit;
 830         }
 831
 832         __nfc_hci_cmd_completion(hdev, err, NULL);
 833
 834 exit:
 835         mutex_unlock(&hdev->msg_tx_mutex);
 836 }
 837
 838 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 839 {
 840         nfc_hci_failure(hdev, err);
 841 }
 842
 843 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 844 {
 845         struct hcp_packet *packet;
 846         u8 type;
 847         u8 instruction;
 848         struct sk_buff *hcp_skb;
 849         u8 pipe;
 850         struct sk_buff *frag_skb;
 851         int msg_len;
 852
 853         packet = (struct hcp_packet *)skb->data;
 854         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 855                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 856                 return;
 857         }
 858
 859         /* it's the last fragment. Does it need re-aggregation? */
 860         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 861                 pipe = packet->header & NFC_HCI_FRAGMENT;
 862                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 863
 864                 msg_len = 0;
 865                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 866                         msg_len += (frag_skb->len -
 867                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 868                 }
 869
 870                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 871                                              msg_len, GFP_KERNEL);
 872                 if (hcp_skb == NULL) {
 873                         nfc_hci_failure(hdev, -ENOMEM);
 874                         return;
 875                 }
 876
 877                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 878
 879                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 880                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 881                         memcpy(skb_put(hcp_skb, msg_len),
 882                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 883                                msg_len);
 884                 }
 885
 886                 skb_queue_purge(&hdev->rx_hcp_frags);
 887         } else {
 888                 packet->header &= NFC_HCI_FRAGMENT;
 889                 hcp_skb = skb;
 890         }
 891
 892         /* if this is a response, dispatch immediately to
 893          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 894          * in separate context where handler can also execute command.
 895          */
 896         packet = (struct hcp_packet *)hcp_skb->data;
 897         type = HCP_MSG_GET_TYPE(packet->message.header);
 898         if (type == NFC_HCI_HCP_RESPONSE) {
 899                 pipe = packet->header;
 900                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 901                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 902                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 903                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 904         } else {
 905                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 906                 schedule_work(&hdev->msg_rx_work);
 907         }
 908 }
 909
 910 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
 911 {
 912         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 913
 914         if (!hdev->ops->fw_download)
 915                 return -ENOTSUPP;
 916
 917         return hdev->ops->fw_download(hdev, firmware_name);
 918 }
 919
 920 static struct nfc_ops hci_nfc_ops = {
 921         .dev_up = hci_dev_up,
 922         .dev_down = hci_dev_down,
 923         .start_poll = hci_start_poll,
 924         .stop_poll = hci_stop_poll,
 925         .dep_link_up = hci_dep_link_up,
 926         .dep_link_down = hci_dep_link_down,
 927         .activate_target = hci_activate_target,
 928         .deactivate_target = hci_deactivate_target,
 929         .im_transceive = hci_transceive,
 930         .tm_send = hci_tm_send,
 931         .check_presence = hci_check_presence,
 932         .fw_download = hci_fw_download,
 933         .discover_se = hci_discover_se,
 934         .enable_se = hci_enable_se,
 935         .disable_se = hci_disable_se,
 936         .se_io = hci_se_io,
 937 };
 938
 939 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 940                                             struct nfc_hci_init_data *init_data,
 941                                             unsigned long quirks,
 942                                             u32 protocols,
 943                                             const char *llc_name,
 944                                             int tx_headroom,
 945                                             int tx_tailroom,
 946                                             int max_link_payload)
 947 {
 948         struct nfc_hci_dev *hdev;
 949
 950         if (ops->xmit == NULL)
 951                 return NULL;
 952
 953         if (protocols == 0)
 954                 return NULL;
 955
 956         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 957         if (hdev == NULL)
 958                 return NULL;
 959
 960         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 961                                      nfc_hci_recv_from_llc, tx_headroom,
 962                                      tx_tailroom, nfc_hci_llc_failure);
 963         if (hdev->llc == NULL) {
 964                 kfree(hdev);
 965                 return NULL;
 966         }
 967
 968         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 969                                          tx_headroom + HCI_CMDS_HEADROOM,
 970                                          tx_tailroom);
 971         if (!hdev->ndev) {
 972                 nfc_llc_free(hdev->llc);
 973                 kfree(hdev);
 974                 return NULL;
 975         }
 976
 977         hdev->ops = ops;
 978         hdev->max_data_link_payload = max_link_payload;
 979         hdev->init_data = *init_data;
 980
 981         nfc_set_drvdata(hdev->ndev, hdev);
 982
 983         nfc_hci_reset_pipes(hdev);
 984
 985         hdev->quirks = quirks;
 986
 987         return hdev;
 988 }
 989 EXPORT_SYMBOL(nfc_hci_allocate_device);
 990
 991 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
 992 {
 993         nfc_free_device(hdev->ndev);
 994         nfc_llc_free(hdev->llc);
 995         kfree(hdev);
 996 }
 997 EXPORT_SYMBOL(nfc_hci_free_device);
 998
 999 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1000 {
1001         mutex_init(&hdev->msg_tx_mutex);
1002
1003         INIT_LIST_HEAD(&hdev->msg_tx_queue);
1004
1005         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1006
1007         init_timer(&hdev->cmd_timer);
1008         hdev->cmd_timer.data = (unsigned long)hdev;
1009         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
1010
1011         skb_queue_head_init(&hdev->rx_hcp_frags);
1012
1013         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1014
1015         skb_queue_head_init(&hdev->msg_rx_queue);
1016
1017         return nfc_register_device(hdev->ndev);
1018 }
1019 EXPORT_SYMBOL(nfc_hci_register_device);
1020
1021 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1022 {
1023         struct hci_msg *msg, *n;
1024
1025         mutex_lock(&hdev->msg_tx_mutex);
1026
1027         if (hdev->cmd_pending_msg) {
1028                 if (hdev->cmd_pending_msg->cb)
1029                         hdev->cmd_pending_msg->cb(
1030                                              hdev->cmd_pending_msg->cb_context,
1031                                              NULL, -ESHUTDOWN);
1032                 kfree(hdev->cmd_pending_msg);
1033                 hdev->cmd_pending_msg = NULL;
1034         }
1035
1036         hdev->shutting_down = true;
1037
1038         mutex_unlock(&hdev->msg_tx_mutex);
1039
1040         del_timer_sync(&hdev->cmd_timer);
1041         cancel_work_sync(&hdev->msg_tx_work);
1042
1043         cancel_work_sync(&hdev->msg_rx_work);
1044
1045         nfc_unregister_device(hdev->ndev);
1046
1047         skb_queue_purge(&hdev->rx_hcp_frags);
1048         skb_queue_purge(&hdev->msg_rx_queue);
1049
1050         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1051                 list_del(&msg->msg_l);
1052                 skb_queue_purge(&msg->msg_frags);
1053                 kfree(msg);
1054         }
1055 }
1056 EXPORT_SYMBOL(nfc_hci_unregister_device);
1057
1058 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1059 {
1060         hdev->clientdata = clientdata;
1061 }
1062 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1063
1064 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1065 {
1066         return hdev->clientdata;
1067 }
1068 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1069
1070 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1071 {
1072         nfc_hci_failure(hdev, err);
1073 }
1074 EXPORT_SYMBOL(nfc_hci_driver_failure);
1075
1076 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1077 {
1078         nfc_llc_rcv_from_drv(hdev->llc, skb);
1079 }
1080 EXPORT_SYMBOL(nfc_hci_recv_frame);
1081
1082 static int __init nfc_hci_init(void)
1083 {
1084         return nfc_llc_init();
1085 }
1086
1087 static void __exit nfc_hci_exit(void)
1088 {
1089         nfc_llc_exit();
1090 }
1091
1092 subsys_initcall(nfc_hci_init);
1093 module_exit(nfc_hci_exit);
1094
1095 MODULE_LICENSE("GPL");
1096 MODULE_DESCRIPTION("NFC HCI Core");