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                 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
 213                         status = NFC_HCI_ANY_E_NOK;
 214                         goto exit;
 215                 }
 216
 217                 /* Save the new created pipe and bind with local gate,
 218                  * the description for skb->data[3] is destination gate id
 219                  * but since we received this cmd from host controller, we
 220                  * are the destination and it is our local gate
 221                  */
 222                 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
 223                 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
 224                 hdev->pipes[create_info->pipe].dest_host =
 225                                                         create_info->src_host;
 226                 break;
 227         case NFC_HCI_ANY_OPEN_PIPE:
 228                 if (gate == NFC_HCI_INVALID_GATE) {
 229                         status = NFC_HCI_ANY_E_NOK;
 230                         goto exit;
 231                 }
 232                 break;
 233         case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
 234                 if (skb->len != 1) {
 235                         status = NFC_HCI_ANY_E_NOK;
 236                         goto exit;
 237                 }
 238                 delete_info = (struct hci_delete_pipe_noti *)skb->data;
 239
 240                 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
 241                         status = NFC_HCI_ANY_E_NOK;
 242                         goto exit;
 243                 }
 244
 245                 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
 246                 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
 247                 break;
 248         case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 249                 if (skb->len != 1) {
 250                         status = NFC_HCI_ANY_E_NOK;
 251                         goto exit;
 252                 }
 253                 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
 254
 255                 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
 256                 break;
 257         default:
 258                 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 259                 break;
 260         }
 261
 262         if (hdev->ops->cmd_received)
 263                 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
 264
 265 exit:
 266         nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
 267                                status, NULL, 0, NULL, NULL, 0);
 268
 269         kfree_skb(skb);
 270 }
 271
 272 u32 nfc_hci_sak_to_protocol(u8 sak)
 273 {
 274         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
 275         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
 276                 return NFC_PROTO_MIFARE_MASK;
 277         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
 278                 return NFC_PROTO_ISO14443_MASK;
 279         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
 280                 return NFC_PROTO_NFC_DEP_MASK;
 281         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
 282                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
 283         default:
 284                 return 0xffffffff;
 285         }
 286 }
 287 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
 288
 289 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
 290 {
 291         struct nfc_target *targets;
 292         struct sk_buff *atqa_skb = NULL;
 293         struct sk_buff *sak_skb = NULL;
 294         struct sk_buff *uid_skb = NULL;
 295         int r;
 296
 297         pr_debug("from gate %d\n", gate);
 298
 299         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 300         if (targets == NULL)
 301                 return -ENOMEM;
 302
 303         switch (gate) {
 304         case NFC_HCI_RF_READER_A_GATE:
 305                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 306                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
 307                 if (r < 0)
 308                         goto exit;
 309
 310                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 311                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
 312                 if (r < 0)
 313                         goto exit;
 314
 315                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
 316                         r = -EPROTO;
 317                         goto exit;
 318                 }
 319
 320                 targets->supported_protocols =
 321                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
 322                 if (targets->supported_protocols == 0xffffffff) {
 323                         r = -EPROTO;
 324                         goto exit;
 325                 }
 326
 327                 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
 328                 targets->sel_res = sak_skb->data[0];
 329
 330                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 331                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
 332                 if (r < 0)
 333                         goto exit;
 334
 335                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 336                         r = -EPROTO;
 337                         goto exit;
 338                 }
 339
 340                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
 341                 targets->nfcid1_len = uid_skb->len;
 342
 343                 if (hdev->ops->complete_target_discovered) {
 344                         r = hdev->ops->complete_target_discovered(hdev, gate,
 345                                                                   targets);
 346                         if (r < 0)
 347                                 goto exit;
 348                 }
 349                 break;
 350         case NFC_HCI_RF_READER_B_GATE:
 351                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 352                 break;
 353         default:
 354                 if (hdev->ops->target_from_gate)
 355                         r = hdev->ops->target_from_gate(hdev, gate, targets);
 356                 else
 357                         r = -EPROTO;
 358                 if (r < 0)
 359                         goto exit;
 360
 361                 if (hdev->ops->complete_target_discovered) {
 362                         r = hdev->ops->complete_target_discovered(hdev, gate,
 363                                                                   targets);
 364                         if (r < 0)
 365                                 goto exit;
 366                 }
 367                 break;
 368         }
 369
 370         /* if driver set the new gate, we will skip the old one */
 371         if (targets->hci_reader_gate == 0x00)
 372                 targets->hci_reader_gate = gate;
 373
 374         r = nfc_targets_found(hdev->ndev, targets, 1);
 375
 376 exit:
 377         kfree(targets);
 378         kfree_skb(atqa_skb);
 379         kfree_skb(sak_skb);
 380         kfree_skb(uid_skb);
 381
 382         return r;
 383 }
 384 EXPORT_SYMBOL(nfc_hci_target_discovered);
 385
 386 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 387                             struct sk_buff *skb)
 388 {
 389         int r = 0;
 390         u8 gate = hdev->pipes[pipe].gate;
 391
 392         if (gate == NFC_HCI_INVALID_GATE) {
 393                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
 394                 goto exit;
 395         }
 396
 397         if (hdev->ops->event_received) {
 398                 r = hdev->ops->event_received(hdev, pipe, event, skb);
 399                 if (r <= 0)
 400                         goto exit_noskb;
 401         }
 402
 403         switch (event) {
 404         case NFC_HCI_EVT_TARGET_DISCOVERED:
 405                 if (skb->len < 1) {     /* no status data? */
 406                         r = -EPROTO;
 407                         goto exit;
 408                 }
 409
 410                 if (skb->data[0] == 3) {
 411                         /* TODO: Multiple targets in field, none activated
 412                          * poll is supposedly stopped, but there is no
 413                          * single target to activate, so nothing to report
 414                          * up.
 415                          * if we need to restart poll, we must save the
 416                          * protocols from the initial poll and reuse here.
 417                          */
 418                 }
 419
 420                 if (skb->data[0] != 0) {
 421                         r = -EPROTO;
 422                         goto exit;
 423                 }
 424
 425                 r = nfc_hci_target_discovered(hdev, gate);
 426                 break;
 427         default:
 428                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
 429                 r = -EINVAL;
 430                 break;
 431         }
 432
 433 exit:
 434         kfree_skb(skb);
 435
 436 exit_noskb:
 437         if (r)
 438                 nfc_hci_driver_failure(hdev, r);
 439 }
 440
 441 static void nfc_hci_cmd_timeout(struct timer_list *t)
 442 {
 443         struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
 444
 445         schedule_work(&hdev->msg_tx_work);
 446 }
 447
 448 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 449                                  struct nfc_hci_gate *gates)
 450 {
 451         int r;
 452         while (gate_count--) {
 453                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 454                                          gates->gate, gates->pipe);
 455                 if (r < 0)
 456                         return r;
 457                 gates++;
 458         }
 459
 460         return 0;
 461 }
 462
 463 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 464 {
 465         struct sk_buff *skb = NULL;
 466         int r;
 467
 468         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 469                 return -EPROTO;
 470
 471         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 472                                  hdev->init_data.gates[0].gate,
 473                                  hdev->init_data.gates[0].pipe);
 474         if (r < 0)
 475                 goto exit;
 476
 477         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 478                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 479         if (r < 0)
 480                 goto disconnect_all;
 481
 482         if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
 483                 (memcmp(hdev->init_data.session_id, skb->data,
 484                            skb->len) == 0) && hdev->ops->load_session) {
 485                 /* Restore gate<->pipe table from some proprietary location. */
 486
 487                 r = hdev->ops->load_session(hdev);
 488
 489                 if (r < 0)
 490                         goto disconnect_all;
 491         } else {
 492
 493                 r = nfc_hci_disconnect_all_gates(hdev);
 494                 if (r < 0)
 495                         goto exit;
 496
 497                 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 498                                           hdev->init_data.gates);
 499                 if (r < 0)
 500                         goto disconnect_all;
 501
 502                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 503                                 NFC_HCI_ADMIN_SESSION_IDENTITY,
 504                                 hdev->init_data.session_id,
 505                                 strlen(hdev->init_data.session_id));
 506         }
 507         if (r == 0)
 508                 goto exit;
 509
 510 disconnect_all:
 511         nfc_hci_disconnect_all_gates(hdev);
 512
 513 exit:
 514         kfree_skb(skb);
 515
 516         return r;
 517 }
 518
 519 static int hci_dev_version(struct nfc_hci_dev *hdev)
 520 {
 521         int r;
 522         struct sk_buff *skb;
 523
 524         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 525                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 526         if (r == -EOPNOTSUPP) {
 527                 pr_info("Software/Hardware info not available\n");
 528                 return 0;
 529         }
 530         if (r < 0)
 531                 return r;
 532
 533         if (skb->len != 3) {
 534                 kfree_skb(skb);
 535                 return -EINVAL;
 536         }
 537
 538         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 539         hdev->sw_patch = skb->data[0] & 0x0f;
 540         hdev->sw_flashlib_major = skb->data[1];
 541         hdev->sw_flashlib_minor = skb->data[2];
 542
 543         kfree_skb(skb);
 544
 545         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 546                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 547         if (r < 0)
 548                 return r;
 549
 550         if (skb->len != 3) {
 551                 kfree_skb(skb);
 552                 return -EINVAL;
 553         }
 554
 555         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 556         hdev->hw_version = skb->data[0] & 0x1f;
 557         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 558         hdev->hw_software = skb->data[1] & 0x3f;
 559         hdev->hw_bsid = skb->data[2];
 560
 561         kfree_skb(skb);
 562
 563         pr_info("SOFTWARE INFO:\n");
 564         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 565         pr_info("Patch          : %d\n", hdev->sw_patch);
 566         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 567         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 568         pr_info("HARDWARE INFO:\n");
 569         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 570         pr_info("HW Version     : %d\n", hdev->hw_version);
 571         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 572         pr_info("Software       : %d\n", hdev->hw_software);
 573         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 574
 575         return 0;
 576 }
 577
 578 static int hci_dev_up(struct nfc_dev *nfc_dev)
 579 {
 580         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 581         int r = 0;
 582
 583         if (hdev->ops->open) {
 584                 r = hdev->ops->open(hdev);
 585                 if (r < 0)
 586                         return r;
 587         }
 588
 589         r = nfc_llc_start(hdev->llc);
 590         if (r < 0)
 591                 goto exit_close;
 592
 593         r = hci_dev_session_init(hdev);
 594         if (r < 0)
 595                 goto exit_llc;
 596
 597         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 598                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 599         if (r < 0)
 600                 goto exit_llc;
 601
 602         if (hdev->ops->hci_ready) {
 603                 r = hdev->ops->hci_ready(hdev);
 604                 if (r < 0)
 605                         goto exit_llc;
 606         }
 607
 608         r = hci_dev_version(hdev);
 609         if (r < 0)
 610                 goto exit_llc;
 611
 612         return 0;
 613
 614 exit_llc:
 615         nfc_llc_stop(hdev->llc);
 616
 617 exit_close:
 618         if (hdev->ops->close)
 619                 hdev->ops->close(hdev);
 620
 621         return r;
 622 }
 623
 624 static int hci_dev_down(struct nfc_dev *nfc_dev)
 625 {
 626         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 627
 628         nfc_llc_stop(hdev->llc);
 629
 630         if (hdev->ops->close)
 631                 hdev->ops->close(hdev);
 632
 633         nfc_hci_reset_pipes(hdev);
 634
 635         return 0;
 636 }
 637
 638 static int hci_start_poll(struct nfc_dev *nfc_dev,
 639                           u32 im_protocols, u32 tm_protocols)
 640 {
 641         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 642
 643         if (hdev->ops->start_poll)
 644                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 645         else
 646                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 647                                           NFC_HCI_EVT_READER_REQUESTED,
 648                                           NULL, 0);
 649 }
 650
 651 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 652 {
 653         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 654
 655         if (hdev->ops->stop_poll)
 656                 hdev->ops->stop_poll(hdev);
 657         else
 658                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 659                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
 660 }
 661
 662 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 663                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 664 {
 665         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 666
 667         if (!hdev->ops->dep_link_up)
 668                 return 0;
 669
 670         return hdev->ops->dep_link_up(hdev, target, comm_mode,
 671                                       gb, gb_len);
 672 }
 673
 674 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 675 {
 676         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 677
 678         if (!hdev->ops->dep_link_down)
 679                 return 0;
 680
 681         return hdev->ops->dep_link_down(hdev);
 682 }
 683
 684 static int hci_activate_target(struct nfc_dev *nfc_dev,
 685                                struct nfc_target *target, u32 protocol)
 686 {
 687         return 0;
 688 }
 689
 690 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 691                                   struct nfc_target *target,
 692                                   u8 mode)
 693 {
 694 }
 695
 696 #define HCI_CB_TYPE_TRANSCEIVE 1
 697
 698 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 699 {
 700         struct nfc_hci_dev *hdev = context;
 701
 702         switch (hdev->async_cb_type) {
 703         case HCI_CB_TYPE_TRANSCEIVE:
 704                 /*
 705                  * TODO: Check RF Error indicator to make sure data is valid.
 706                  * It seems that HCI cmd can complete without error, but data
 707                  * can be invalid if an RF error occured? Ignore for now.
 708                  */
 709                 if (err == 0)
 710                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 711
 712                 hdev->async_cb(hdev->async_cb_context, skb, err);
 713                 break;
 714         default:
 715                 if (err == 0)
 716                         kfree_skb(skb);
 717                 break;
 718         }
 719 }
 720
 721 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 722                           struct sk_buff *skb, data_exchange_cb_t cb,
 723                           void *cb_context)
 724 {
 725         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 726         int r;
 727
 728         pr_debug("target_idx=%d\n", target->idx);
 729
 730         switch (target->hci_reader_gate) {
 731         case NFC_HCI_RF_READER_A_GATE:
 732         case NFC_HCI_RF_READER_B_GATE:
 733                 if (hdev->ops->im_transceive) {
 734                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 735                                                      cb_context);
 736                         if (r <= 0)     /* handled */
 737                                 break;
 738                 }
 739
 740                 *(u8 *)skb_push(skb, 1) = 0;    /* CTR, see spec:10.2.2.1 */
 741
 742                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 743                 hdev->async_cb = cb;
 744                 hdev->async_cb_context = cb_context;
 745
 746                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 747                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 748                                            skb->len, hci_transceive_cb, hdev);
 749                 break;
 750         default:
 751                 if (hdev->ops->im_transceive) {
 752                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 753                                                      cb_context);
 754                         if (r == 1)
 755                                 r = -ENOTSUPP;
 756                 } else {
 757                         r = -ENOTSUPP;
 758                 }
 759                 break;
 760         }
 761
 762         kfree_skb(skb);
 763
 764         return r;
 765 }
 766
 767 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 768 {
 769         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 770
 771         if (!hdev->ops->tm_send) {
 772                 kfree_skb(skb);
 773                 return -ENOTSUPP;
 774         }
 775
 776         return hdev->ops->tm_send(hdev, skb);
 777 }
 778
 779 static int hci_check_presence(struct nfc_dev *nfc_dev,
 780                               struct nfc_target *target)
 781 {
 782         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 783
 784         if (!hdev->ops->check_presence)
 785                 return 0;
 786
 787         return hdev->ops->check_presence(hdev, target);
 788 }
 789
 790 static int hci_discover_se(struct nfc_dev *nfc_dev)
 791 {
 792         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 793
 794         if (hdev->ops->discover_se)
 795                 return hdev->ops->discover_se(hdev);
 796
 797         return 0;
 798 }
 799
 800 static int hci_enable_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->enable_se)
 805                 return hdev->ops->enable_se(hdev, se_idx);
 806
 807         return 0;
 808 }
 809
 810 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 811 {
 812         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 813
 814         if (hdev->ops->disable_se)
 815                 return hdev->ops->disable_se(hdev, se_idx);
 816
 817         return 0;
 818 }
 819
 820 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
 821                      u8 *apdu, size_t apdu_length,
 822                      se_io_cb_t cb, void *cb_context)
 823 {
 824         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 825
 826         if (hdev->ops->se_io)
 827                 return hdev->ops->se_io(hdev, se_idx, apdu,
 828                                         apdu_length, cb, cb_context);
 829
 830         return 0;
 831 }
 832
 833 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 834 {
 835         mutex_lock(&hdev->msg_tx_mutex);
 836
 837         if (hdev->cmd_pending_msg == NULL) {
 838                 nfc_driver_failure(hdev->ndev, err);
 839                 goto exit;
 840         }
 841
 842         __nfc_hci_cmd_completion(hdev, err, NULL);
 843
 844 exit:
 845         mutex_unlock(&hdev->msg_tx_mutex);
 846 }
 847
 848 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 849 {
 850         nfc_hci_failure(hdev, err);
 851 }
 852
 853 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 854 {
 855         struct hcp_packet *packet;
 856         u8 type;
 857         u8 instruction;
 858         struct sk_buff *hcp_skb;
 859         u8 pipe;
 860         struct sk_buff *frag_skb;
 861         int msg_len;
 862
 863         packet = (struct hcp_packet *)skb->data;
 864         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 865                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 866                 return;
 867         }
 868
 869         /* it's the last fragment. Does it need re-aggregation? */
 870         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 871                 pipe = packet->header & NFC_HCI_FRAGMENT;
 872                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 873
 874                 msg_len = 0;
 875                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 876                         msg_len += (frag_skb->len -
 877                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 878                 }
 879
 880                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 881                                              msg_len, GFP_KERNEL);
 882                 if (hcp_skb == NULL) {
 883                         nfc_hci_failure(hdev, -ENOMEM);
 884                         return;
 885                 }
 886
 887                 skb_put_u8(hcp_skb, pipe);
 888
 889                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 890                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 891                         skb_put_data(hcp_skb,
 892                                      frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 893                                      msg_len);
 894                 }
 895
 896                 skb_queue_purge(&hdev->rx_hcp_frags);
 897         } else {
 898                 packet->header &= NFC_HCI_FRAGMENT;
 899                 hcp_skb = skb;
 900         }
 901
 902         /* if this is a response, dispatch immediately to
 903          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 904          * in separate context where handler can also execute command.
 905          */
 906         packet = (struct hcp_packet *)hcp_skb->data;
 907         type = HCP_MSG_GET_TYPE(packet->message.header);
 908         if (type == NFC_HCI_HCP_RESPONSE) {
 909                 pipe = packet->header;
 910                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 911                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 912                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 913                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 914         } else {
 915                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 916                 schedule_work(&hdev->msg_rx_work);
 917         }
 918 }
 919
 920 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
 921 {
 922         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 923
 924         if (!hdev->ops->fw_download)
 925                 return -ENOTSUPP;
 926
 927         return hdev->ops->fw_download(hdev, firmware_name);
 928 }
 929
 930 static struct nfc_ops hci_nfc_ops = {
 931         .dev_up = hci_dev_up,
 932         .dev_down = hci_dev_down,
 933         .start_poll = hci_start_poll,
 934         .stop_poll = hci_stop_poll,
 935         .dep_link_up = hci_dep_link_up,
 936         .dep_link_down = hci_dep_link_down,
 937         .activate_target = hci_activate_target,
 938         .deactivate_target = hci_deactivate_target,
 939         .im_transceive = hci_transceive,
 940         .tm_send = hci_tm_send,
 941         .check_presence = hci_check_presence,
 942         .fw_download = hci_fw_download,
 943         .discover_se = hci_discover_se,
 944         .enable_se = hci_enable_se,
 945         .disable_se = hci_disable_se,
 946         .se_io = hci_se_io,
 947 };
 948
 949 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 950                                             struct nfc_hci_init_data *init_data,
 951                                             unsigned long quirks,
 952                                             u32 protocols,
 953                                             const char *llc_name,
 954                                             int tx_headroom,
 955                                             int tx_tailroom,
 956                                             int max_link_payload)
 957 {
 958         struct nfc_hci_dev *hdev;
 959
 960         if (ops->xmit == NULL)
 961                 return NULL;
 962
 963         if (protocols == 0)
 964                 return NULL;
 965
 966         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 967         if (hdev == NULL)
 968                 return NULL;
 969
 970         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 971                                      nfc_hci_recv_from_llc, tx_headroom,
 972                                      tx_tailroom, nfc_hci_llc_failure);
 973         if (hdev->llc == NULL) {
 974                 kfree(hdev);
 975                 return NULL;
 976         }
 977
 978         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 979                                          tx_headroom + HCI_CMDS_HEADROOM,
 980                                          tx_tailroom);
 981         if (!hdev->ndev) {
 982                 nfc_llc_free(hdev->llc);
 983                 kfree(hdev);
 984                 return NULL;
 985         }
 986
 987         hdev->ops = ops;
 988         hdev->max_data_link_payload = max_link_payload;
 989         hdev->init_data = *init_data;
 990
 991         nfc_set_drvdata(hdev->ndev, hdev);
 992
 993         nfc_hci_reset_pipes(hdev);
 994
 995         hdev->quirks = quirks;
 996
 997         return hdev;
 998 }
 999 EXPORT_SYMBOL(nfc_hci_allocate_device);
1000
1001 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1002 {
1003         nfc_free_device(hdev->ndev);
1004         nfc_llc_free(hdev->llc);
1005         kfree(hdev);
1006 }
1007 EXPORT_SYMBOL(nfc_hci_free_device);
1008
1009 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1010 {
1011         mutex_init(&hdev->msg_tx_mutex);
1012
1013         INIT_LIST_HEAD(&hdev->msg_tx_queue);
1014
1015         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1016
1017         timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1018
1019         skb_queue_head_init(&hdev->rx_hcp_frags);
1020
1021         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1022
1023         skb_queue_head_init(&hdev->msg_rx_queue);
1024
1025         return nfc_register_device(hdev->ndev);
1026 }
1027 EXPORT_SYMBOL(nfc_hci_register_device);
1028
1029 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1030 {
1031         struct hci_msg *msg, *n;
1032
1033         mutex_lock(&hdev->msg_tx_mutex);
1034
1035         if (hdev->cmd_pending_msg) {
1036                 if (hdev->cmd_pending_msg->cb)
1037                         hdev->cmd_pending_msg->cb(
1038                                              hdev->cmd_pending_msg->cb_context,
1039                                              NULL, -ESHUTDOWN);
1040                 kfree(hdev->cmd_pending_msg);
1041                 hdev->cmd_pending_msg = NULL;
1042         }
1043
1044         hdev->shutting_down = true;
1045
1046         mutex_unlock(&hdev->msg_tx_mutex);
1047
1048         del_timer_sync(&hdev->cmd_timer);
1049         cancel_work_sync(&hdev->msg_tx_work);
1050
1051         cancel_work_sync(&hdev->msg_rx_work);
1052
1053         nfc_unregister_device(hdev->ndev);
1054
1055         skb_queue_purge(&hdev->rx_hcp_frags);
1056         skb_queue_purge(&hdev->msg_rx_queue);
1057
1058         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1059                 list_del(&msg->msg_l);
1060                 skb_queue_purge(&msg->msg_frags);
1061                 kfree(msg);
1062         }
1063 }
1064 EXPORT_SYMBOL(nfc_hci_unregister_device);
1065
1066 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1067 {
1068         hdev->clientdata = clientdata;
1069 }
1070 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1071
1072 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1073 {
1074         return hdev->clientdata;
1075 }
1076 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1077
1078 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1079 {
1080         nfc_hci_failure(hdev, err);
1081 }
1082 EXPORT_SYMBOL(nfc_hci_driver_failure);
1083
1084 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1085 {
1086         nfc_llc_rcv_from_drv(hdev->llc, skb);
1087 }
1088 EXPORT_SYMBOL(nfc_hci_recv_frame);
1089
1090 static int __init nfc_hci_init(void)
1091 {
1092         return nfc_llc_init();
1093 }
1094
1095 static void __exit nfc_hci_exit(void)
1096 {
1097         nfc_llc_exit();
1098 }
1099
1100 subsys_initcall(nfc_hci_init);
1101 module_exit(nfc_hci_exit);
1102
1103 MODULE_LICENSE("GPL");
1104 MODULE_DESCRIPTION("NFC HCI Core");