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 status = NFC_HCI_ANY_OK;
 197         struct hci_create_pipe_resp *create_info;
 198         struct hci_delete_pipe_noti *delete_info;
 199         struct hci_all_pipe_cleared_noti *cleared_info;
 200         u8 gate;
 201
 202         pr_debug("from pipe %x cmd %x\n", pipe, cmd);
 203
 204         if (pipe >= NFC_HCI_MAX_PIPES) {
 205                 status = NFC_HCI_ANY_E_NOK;
 206                 goto exit;
 207         }
 208
 209         gate = hdev->pipes[pipe].gate;
 210
 211         switch (cmd) {
 212         case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
 213                 if (skb->len != 5) {
 214                         status = NFC_HCI_ANY_E_NOK;
 215                         goto exit;
 216                 }
 217                 create_info = (struct hci_create_pipe_resp *)skb->data;
 218
 219                 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
 220                         status = NFC_HCI_ANY_E_NOK;
 221                         goto exit;
 222                 }
 223
 224                 /* Save the new created pipe and bind with local gate,
 225                  * the description for skb->data[3] is destination gate id
 226                  * but since we received this cmd from host controller, we
 227                  * are the destination and it is our local gate
 228                  */
 229                 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
 230                 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
 231                 hdev->pipes[create_info->pipe].dest_host =
 232                                                         create_info->src_host;
 233                 break;
 234         case NFC_HCI_ANY_OPEN_PIPE:
 235                 if (gate == NFC_HCI_INVALID_GATE) {
 236                         status = NFC_HCI_ANY_E_NOK;
 237                         goto exit;
 238                 }
 239                 break;
 240         case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
 241                 if (skb->len != 1) {
 242                         status = NFC_HCI_ANY_E_NOK;
 243                         goto exit;
 244                 }
 245                 delete_info = (struct hci_delete_pipe_noti *)skb->data;
 246
 247                 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
 248                         status = NFC_HCI_ANY_E_NOK;
 249                         goto exit;
 250                 }
 251
 252                 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
 253                 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
 254                 break;
 255         case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 256                 if (skb->len != 1) {
 257                         status = NFC_HCI_ANY_E_NOK;
 258                         goto exit;
 259                 }
 260                 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
 261
 262                 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
 263                 break;
 264         default:
 265                 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 266                 break;
 267         }
 268
 269         if (hdev->ops->cmd_received)
 270                 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
 271
 272 exit:
 273         nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
 274                                status, NULL, 0, NULL, NULL, 0);
 275
 276         kfree_skb(skb);
 277 }
 278
 279 u32 nfc_hci_sak_to_protocol(u8 sak)
 280 {
 281         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
 282         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
 283                 return NFC_PROTO_MIFARE_MASK;
 284         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
 285                 return NFC_PROTO_ISO14443_MASK;
 286         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
 287                 return NFC_PROTO_NFC_DEP_MASK;
 288         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
 289                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
 290         default:
 291                 return 0xffffffff;
 292         }
 293 }
 294 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
 295
 296 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
 297 {
 298         struct nfc_target *targets;
 299         struct sk_buff *atqa_skb = NULL;
 300         struct sk_buff *sak_skb = NULL;
 301         struct sk_buff *uid_skb = NULL;
 302         int r;
 303
 304         pr_debug("from gate %d\n", gate);
 305
 306         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 307         if (targets == NULL)
 308                 return -ENOMEM;
 309
 310         switch (gate) {
 311         case NFC_HCI_RF_READER_A_GATE:
 312                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 313                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
 314                 if (r < 0)
 315                         goto exit;
 316
 317                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 318                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
 319                 if (r < 0)
 320                         goto exit;
 321
 322                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
 323                         r = -EPROTO;
 324                         goto exit;
 325                 }
 326
 327                 targets->supported_protocols =
 328                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
 329                 if (targets->supported_protocols == 0xffffffff) {
 330                         r = -EPROTO;
 331                         goto exit;
 332                 }
 333
 334                 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
 335                 targets->sel_res = sak_skb->data[0];
 336
 337                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
 338                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
 339                 if (r < 0)
 340                         goto exit;
 341
 342                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 343                         r = -EPROTO;
 344                         goto exit;
 345                 }
 346
 347                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
 348                 targets->nfcid1_len = uid_skb->len;
 349
 350                 if (hdev->ops->complete_target_discovered) {
 351                         r = hdev->ops->complete_target_discovered(hdev, gate,
 352                                                                   targets);
 353                         if (r < 0)
 354                                 goto exit;
 355                 }
 356                 break;
 357         case NFC_HCI_RF_READER_B_GATE:
 358                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 359                 break;
 360         default:
 361                 if (hdev->ops->target_from_gate)
 362                         r = hdev->ops->target_from_gate(hdev, gate, targets);
 363                 else
 364                         r = -EPROTO;
 365                 if (r < 0)
 366                         goto exit;
 367
 368                 if (hdev->ops->complete_target_discovered) {
 369                         r = hdev->ops->complete_target_discovered(hdev, gate,
 370                                                                   targets);
 371                         if (r < 0)
 372                                 goto exit;
 373                 }
 374                 break;
 375         }
 376
 377         /* if driver set the new gate, we will skip the old one */
 378         if (targets->hci_reader_gate == 0x00)
 379                 targets->hci_reader_gate = gate;
 380
 381         r = nfc_targets_found(hdev->ndev, targets, 1);
 382
 383 exit:
 384         kfree(targets);
 385         kfree_skb(atqa_skb);
 386         kfree_skb(sak_skb);
 387         kfree_skb(uid_skb);
 388
 389         return r;
 390 }
 391 EXPORT_SYMBOL(nfc_hci_target_discovered);
 392
 393 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
 394                             struct sk_buff *skb)
 395 {
 396         int r = 0;
 397         u8 gate;
 398
 399         if (pipe >= NFC_HCI_MAX_PIPES) {
 400                 pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
 401                 goto exit;
 402         }
 403
 404         gate = hdev->pipes[pipe].gate;
 405         if (gate == NFC_HCI_INVALID_GATE) {
 406                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
 407                 goto exit;
 408         }
 409
 410         if (hdev->ops->event_received) {
 411                 r = hdev->ops->event_received(hdev, pipe, event, skb);
 412                 if (r <= 0)
 413                         goto exit_noskb;
 414         }
 415
 416         switch (event) {
 417         case NFC_HCI_EVT_TARGET_DISCOVERED:
 418                 if (skb->len < 1) {     /* no status data? */
 419                         r = -EPROTO;
 420                         goto exit;
 421                 }
 422
 423                 if (skb->data[0] == 3) {
 424                         /* TODO: Multiple targets in field, none activated
 425                          * poll is supposedly stopped, but there is no
 426                          * single target to activate, so nothing to report
 427                          * up.
 428                          * if we need to restart poll, we must save the
 429                          * protocols from the initial poll and reuse here.
 430                          */
 431                 }
 432
 433                 if (skb->data[0] != 0) {
 434                         r = -EPROTO;
 435                         goto exit;
 436                 }
 437
 438                 r = nfc_hci_target_discovered(hdev, gate);
 439                 break;
 440         default:
 441                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
 442                 r = -EINVAL;
 443                 break;
 444         }
 445
 446 exit:
 447         kfree_skb(skb);
 448
 449 exit_noskb:
 450         if (r)
 451                 nfc_hci_driver_failure(hdev, r);
 452 }
 453
 454 static void nfc_hci_cmd_timeout(unsigned long data)
 455 {
 456         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
 457
 458         schedule_work(&hdev->msg_tx_work);
 459 }
 460
 461 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
 462                                  struct nfc_hci_gate *gates)
 463 {
 464         int r;
 465         while (gate_count--) {
 466                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 467                                          gates->gate, gates->pipe);
 468                 if (r < 0)
 469                         return r;
 470                 gates++;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
 477 {
 478         struct sk_buff *skb = NULL;
 479         int r;
 480
 481         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
 482                 return -EPROTO;
 483
 484         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 485                                  hdev->init_data.gates[0].gate,
 486                                  hdev->init_data.gates[0].pipe);
 487         if (r < 0)
 488                 goto exit;
 489
 490         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
 491                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
 492         if (r < 0)
 493                 goto disconnect_all;
 494
 495         if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
 496                 (memcmp(hdev->init_data.session_id, skb->data,
 497                            skb->len) == 0) && hdev->ops->load_session) {
 498                 /* Restore gate<->pipe table from some proprietary location. */
 499
 500                 r = hdev->ops->load_session(hdev);
 501
 502                 if (r < 0)
 503                         goto disconnect_all;
 504         } else {
 505
 506                 r = nfc_hci_disconnect_all_gates(hdev);
 507                 if (r < 0)
 508                         goto exit;
 509
 510                 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
 511                                           hdev->init_data.gates);
 512                 if (r < 0)
 513                         goto disconnect_all;
 514
 515                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 516                                 NFC_HCI_ADMIN_SESSION_IDENTITY,
 517                                 hdev->init_data.session_id,
 518                                 strlen(hdev->init_data.session_id));
 519         }
 520         if (r == 0)
 521                 goto exit;
 522
 523 disconnect_all:
 524         nfc_hci_disconnect_all_gates(hdev);
 525
 526 exit:
 527         kfree_skb(skb);
 528
 529         return r;
 530 }
 531
 532 static int hci_dev_version(struct nfc_hci_dev *hdev)
 533 {
 534         int r;
 535         struct sk_buff *skb;
 536
 537         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 538                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 539         if (r == -EOPNOTSUPP) {
 540                 pr_info("Software/Hardware info not available\n");
 541                 return 0;
 542         }
 543         if (r < 0)
 544                 return r;
 545
 546         if (skb->len != 3) {
 547                 kfree_skb(skb);
 548                 return -EINVAL;
 549         }
 550
 551         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
 552         hdev->sw_patch = skb->data[0] & 0x0f;
 553         hdev->sw_flashlib_major = skb->data[1];
 554         hdev->sw_flashlib_minor = skb->data[2];
 555
 556         kfree_skb(skb);
 557
 558         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 559                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
 560         if (r < 0)
 561                 return r;
 562
 563         if (skb->len != 3) {
 564                 kfree_skb(skb);
 565                 return -EINVAL;
 566         }
 567
 568         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
 569         hdev->hw_version = skb->data[0] & 0x1f;
 570         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
 571         hdev->hw_software = skb->data[1] & 0x3f;
 572         hdev->hw_bsid = skb->data[2];
 573
 574         kfree_skb(skb);
 575
 576         pr_info("SOFTWARE INFO:\n");
 577         pr_info("RomLib         : %d\n", hdev->sw_romlib);
 578         pr_info("Patch          : %d\n", hdev->sw_patch);
 579         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
 580         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
 581         pr_info("HARDWARE INFO:\n");
 582         pr_info("Derivative     : %d\n", hdev->hw_derivative);
 583         pr_info("HW Version     : %d\n", hdev->hw_version);
 584         pr_info("#MPW           : %d\n", hdev->hw_mpw);
 585         pr_info("Software       : %d\n", hdev->hw_software);
 586         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
 587
 588         return 0;
 589 }
 590
 591 static int hci_dev_up(struct nfc_dev *nfc_dev)
 592 {
 593         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 594         int r = 0;
 595
 596         if (hdev->ops->open) {
 597                 r = hdev->ops->open(hdev);
 598                 if (r < 0)
 599                         return r;
 600         }
 601
 602         r = nfc_llc_start(hdev->llc);
 603         if (r < 0)
 604                 goto exit_close;
 605
 606         r = hci_dev_session_init(hdev);
 607         if (r < 0)
 608                 goto exit_llc;
 609
 610         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 611                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 612         if (r < 0)
 613                 goto exit_llc;
 614
 615         if (hdev->ops->hci_ready) {
 616                 r = hdev->ops->hci_ready(hdev);
 617                 if (r < 0)
 618                         goto exit_llc;
 619         }
 620
 621         r = hci_dev_version(hdev);
 622         if (r < 0)
 623                 goto exit_llc;
 624
 625         return 0;
 626
 627 exit_llc:
 628         nfc_llc_stop(hdev->llc);
 629
 630 exit_close:
 631         if (hdev->ops->close)
 632                 hdev->ops->close(hdev);
 633
 634         return r;
 635 }
 636
 637 static int hci_dev_down(struct nfc_dev *nfc_dev)
 638 {
 639         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 640
 641         nfc_llc_stop(hdev->llc);
 642
 643         if (hdev->ops->close)
 644                 hdev->ops->close(hdev);
 645
 646         nfc_hci_reset_pipes(hdev);
 647
 648         return 0;
 649 }
 650
 651 static int hci_start_poll(struct nfc_dev *nfc_dev,
 652                           u32 im_protocols, u32 tm_protocols)
 653 {
 654         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 655
 656         if (hdev->ops->start_poll)
 657                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
 658         else
 659                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 660                                           NFC_HCI_EVT_READER_REQUESTED,
 661                                           NULL, 0);
 662 }
 663
 664 static void hci_stop_poll(struct nfc_dev *nfc_dev)
 665 {
 666         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 667
 668         if (hdev->ops->stop_poll)
 669                 hdev->ops->stop_poll(hdev);
 670         else
 671                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 672                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
 673 }
 674
 675 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 676                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
 677 {
 678         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 679
 680         if (!hdev->ops->dep_link_up)
 681                 return 0;
 682
 683         return hdev->ops->dep_link_up(hdev, target, comm_mode,
 684                                       gb, gb_len);
 685 }
 686
 687 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
 688 {
 689         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 690
 691         if (!hdev->ops->dep_link_down)
 692                 return 0;
 693
 694         return hdev->ops->dep_link_down(hdev);
 695 }
 696
 697 static int hci_activate_target(struct nfc_dev *nfc_dev,
 698                                struct nfc_target *target, u32 protocol)
 699 {
 700         return 0;
 701 }
 702
 703 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 704                                   struct nfc_target *target,
 705                                   u8 mode)
 706 {
 707 }
 708
 709 #define HCI_CB_TYPE_TRANSCEIVE 1
 710
 711 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
 712 {
 713         struct nfc_hci_dev *hdev = context;
 714
 715         switch (hdev->async_cb_type) {
 716         case HCI_CB_TYPE_TRANSCEIVE:
 717                 /*
 718                  * TODO: Check RF Error indicator to make sure data is valid.
 719                  * It seems that HCI cmd can complete without error, but data
 720                  * can be invalid if an RF error occured? Ignore for now.
 721                  */
 722                 if (err == 0)
 723                         skb_trim(skb, skb->len - 1); /* RF Err ind */
 724
 725                 hdev->async_cb(hdev->async_cb_context, skb, err);
 726                 break;
 727         default:
 728                 if (err == 0)
 729                         kfree_skb(skb);
 730                 break;
 731         }
 732 }
 733
 734 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 735                           struct sk_buff *skb, data_exchange_cb_t cb,
 736                           void *cb_context)
 737 {
 738         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 739         int r;
 740
 741         pr_debug("target_idx=%d\n", target->idx);
 742
 743         switch (target->hci_reader_gate) {
 744         case NFC_HCI_RF_READER_A_GATE:
 745         case NFC_HCI_RF_READER_B_GATE:
 746                 if (hdev->ops->im_transceive) {
 747                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 748                                                      cb_context);
 749                         if (r <= 0)     /* handled */
 750                                 break;
 751                 }
 752
 753                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
 754
 755                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
 756                 hdev->async_cb = cb;
 757                 hdev->async_cb_context = cb_context;
 758
 759                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 760                                            NFC_HCI_WR_XCHG_DATA, skb->data,
 761                                            skb->len, hci_transceive_cb, hdev);
 762                 break;
 763         default:
 764                 if (hdev->ops->im_transceive) {
 765                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
 766                                                      cb_context);
 767                         if (r == 1)
 768                                 r = -ENOTSUPP;
 769                 } else {
 770                         r = -ENOTSUPP;
 771                 }
 772                 break;
 773         }
 774
 775         kfree_skb(skb);
 776
 777         return r;
 778 }
 779
 780 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
 781 {
 782         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 783
 784         if (!hdev->ops->tm_send) {
 785                 kfree_skb(skb);
 786                 return -ENOTSUPP;
 787         }
 788
 789         return hdev->ops->tm_send(hdev, skb);
 790 }
 791
 792 static int hci_check_presence(struct nfc_dev *nfc_dev,
 793                               struct nfc_target *target)
 794 {
 795         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 796
 797         if (!hdev->ops->check_presence)
 798                 return 0;
 799
 800         return hdev->ops->check_presence(hdev, target);
 801 }
 802
 803 static int hci_discover_se(struct nfc_dev *nfc_dev)
 804 {
 805         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 806
 807         if (hdev->ops->discover_se)
 808                 return hdev->ops->discover_se(hdev);
 809
 810         return 0;
 811 }
 812
 813 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 814 {
 815         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 816
 817         if (hdev->ops->enable_se)
 818                 return hdev->ops->enable_se(hdev, se_idx);
 819
 820         return 0;
 821 }
 822
 823 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
 824 {
 825         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 826
 827         if (hdev->ops->disable_se)
 828                 return hdev->ops->disable_se(hdev, se_idx);
 829
 830         return 0;
 831 }
 832
 833 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
 834                      u8 *apdu, size_t apdu_length,
 835                      se_io_cb_t cb, void *cb_context)
 836 {
 837         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 838
 839         if (hdev->ops->se_io)
 840                 return hdev->ops->se_io(hdev, se_idx, apdu,
 841                                         apdu_length, cb, cb_context);
 842
 843         return 0;
 844 }
 845
 846 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
 847 {
 848         mutex_lock(&hdev->msg_tx_mutex);
 849
 850         if (hdev->cmd_pending_msg == NULL) {
 851                 nfc_driver_failure(hdev->ndev, err);
 852                 goto exit;
 853         }
 854
 855         __nfc_hci_cmd_completion(hdev, err, NULL);
 856
 857 exit:
 858         mutex_unlock(&hdev->msg_tx_mutex);
 859 }
 860
 861 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 862 {
 863         nfc_hci_failure(hdev, err);
 864 }
 865
 866 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 867 {
 868         struct hcp_packet *packet;
 869         u8 type;
 870         u8 instruction;
 871         struct sk_buff *hcp_skb;
 872         u8 pipe;
 873         struct sk_buff *frag_skb;
 874         int msg_len;
 875
 876         packet = (struct hcp_packet *)skb->data;
 877         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
 878                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 879                 return;
 880         }
 881
 882         /* it's the last fragment. Does it need re-aggregation? */
 883         if (skb_queue_len(&hdev->rx_hcp_frags)) {
 884                 pipe = packet->header & NFC_HCI_FRAGMENT;
 885                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
 886
 887                 msg_len = 0;
 888                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 889                         msg_len += (frag_skb->len -
 890                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
 891                 }
 892
 893                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
 894                                              msg_len, GFP_KERNEL);
 895                 if (hcp_skb == NULL) {
 896                         nfc_hci_failure(hdev, -ENOMEM);
 897                         return;
 898                 }
 899
 900                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 901
 902                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
 903                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
 904                         memcpy(skb_put(hcp_skb, msg_len),
 905                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
 906                                msg_len);
 907                 }
 908
 909                 skb_queue_purge(&hdev->rx_hcp_frags);
 910         } else {
 911                 packet->header &= NFC_HCI_FRAGMENT;
 912                 hcp_skb = skb;
 913         }
 914
 915         /* if this is a response, dispatch immediately to
 916          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 917          * in separate context where handler can also execute command.
 918          */
 919         packet = (struct hcp_packet *)hcp_skb->data;
 920         type = HCP_MSG_GET_TYPE(packet->message.header);
 921         if (type == NFC_HCI_HCP_RESPONSE) {
 922                 pipe = packet->header;
 923                 instruction = HCP_MSG_GET_CMD(packet->message.header);
 924                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
 925                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
 926                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
 927         } else {
 928                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
 929                 schedule_work(&hdev->msg_rx_work);
 930         }
 931 }
 932
 933 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
 934 {
 935         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
 936
 937         if (!hdev->ops->fw_download)
 938                 return -ENOTSUPP;
 939
 940         return hdev->ops->fw_download(hdev, firmware_name);
 941 }
 942
 943 static struct nfc_ops hci_nfc_ops = {
 944         .dev_up = hci_dev_up,
 945         .dev_down = hci_dev_down,
 946         .start_poll = hci_start_poll,
 947         .stop_poll = hci_stop_poll,
 948         .dep_link_up = hci_dep_link_up,
 949         .dep_link_down = hci_dep_link_down,
 950         .activate_target = hci_activate_target,
 951         .deactivate_target = hci_deactivate_target,
 952         .im_transceive = hci_transceive,
 953         .tm_send = hci_tm_send,
 954         .check_presence = hci_check_presence,
 955         .fw_download = hci_fw_download,
 956         .discover_se = hci_discover_se,
 957         .enable_se = hci_enable_se,
 958         .disable_se = hci_disable_se,
 959         .se_io = hci_se_io,
 960 };
 961
 962 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
 963                                             struct nfc_hci_init_data *init_data,
 964                                             unsigned long quirks,
 965                                             u32 protocols,
 966                                             const char *llc_name,
 967                                             int tx_headroom,
 968                                             int tx_tailroom,
 969                                             int max_link_payload)
 970 {
 971         struct nfc_hci_dev *hdev;
 972
 973         if (ops->xmit == NULL)
 974                 return NULL;
 975
 976         if (protocols == 0)
 977                 return NULL;
 978
 979         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
 980         if (hdev == NULL)
 981                 return NULL;
 982
 983         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
 984                                      nfc_hci_recv_from_llc, tx_headroom,
 985                                      tx_tailroom, nfc_hci_llc_failure);
 986         if (hdev->llc == NULL) {
 987                 kfree(hdev);
 988                 return NULL;
 989         }
 990
 991         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
 992                                          tx_headroom + HCI_CMDS_HEADROOM,
 993                                          tx_tailroom);
 994         if (!hdev->ndev) {
 995                 nfc_llc_free(hdev->llc);
 996                 kfree(hdev);
 997                 return NULL;
 998         }
 999
1000         hdev->ops = ops;
1001         hdev->max_data_link_payload = max_link_payload;
1002         hdev->init_data = *init_data;
1003
1004         nfc_set_drvdata(hdev->ndev, hdev);
1005
1006         nfc_hci_reset_pipes(hdev);
1007
1008         hdev->quirks = quirks;
1009
1010         return hdev;
1011 }
1012 EXPORT_SYMBOL(nfc_hci_allocate_device);
1013
1014 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1015 {
1016         nfc_free_device(hdev->ndev);
1017         nfc_llc_free(hdev->llc);
1018         kfree(hdev);
1019 }
1020 EXPORT_SYMBOL(nfc_hci_free_device);
1021
1022 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1023 {
1024         mutex_init(&hdev->msg_tx_mutex);
1025
1026         INIT_LIST_HEAD(&hdev->msg_tx_queue);
1027
1028         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1029
1030         init_timer(&hdev->cmd_timer);
1031         hdev->cmd_timer.data = (unsigned long)hdev;
1032         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
1033
1034         skb_queue_head_init(&hdev->rx_hcp_frags);
1035
1036         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1037
1038         skb_queue_head_init(&hdev->msg_rx_queue);
1039
1040         return nfc_register_device(hdev->ndev);
1041 }
1042 EXPORT_SYMBOL(nfc_hci_register_device);
1043
1044 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1045 {
1046         struct hci_msg *msg, *n;
1047
1048         mutex_lock(&hdev->msg_tx_mutex);
1049
1050         if (hdev->cmd_pending_msg) {
1051                 if (hdev->cmd_pending_msg->cb)
1052                         hdev->cmd_pending_msg->cb(
1053                                              hdev->cmd_pending_msg->cb_context,
1054                                              NULL, -ESHUTDOWN);
1055                 kfree(hdev->cmd_pending_msg);
1056                 hdev->cmd_pending_msg = NULL;
1057         }
1058
1059         hdev->shutting_down = true;
1060
1061         mutex_unlock(&hdev->msg_tx_mutex);
1062
1063         del_timer_sync(&hdev->cmd_timer);
1064         cancel_work_sync(&hdev->msg_tx_work);
1065
1066         cancel_work_sync(&hdev->msg_rx_work);
1067
1068         nfc_unregister_device(hdev->ndev);
1069
1070         skb_queue_purge(&hdev->rx_hcp_frags);
1071         skb_queue_purge(&hdev->msg_rx_queue);
1072
1073         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1074                 list_del(&msg->msg_l);
1075                 skb_queue_purge(&msg->msg_frags);
1076                 kfree(msg);
1077         }
1078 }
1079 EXPORT_SYMBOL(nfc_hci_unregister_device);
1080
1081 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1082 {
1083         hdev->clientdata = clientdata;
1084 }
1085 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1086
1087 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1088 {
1089         return hdev->clientdata;
1090 }
1091 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1092
1093 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1094 {
1095         nfc_hci_failure(hdev, err);
1096 }
1097 EXPORT_SYMBOL(nfc_hci_driver_failure);
1098
1099 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1100 {
1101         nfc_llc_rcv_from_drv(hdev->llc, skb);
1102 }
1103 EXPORT_SYMBOL(nfc_hci_recv_frame);
1104
1105 static int __init nfc_hci_init(void)
1106 {
1107         return nfc_llc_init();
1108 }
1109
1110 static void __exit nfc_hci_exit(void)
1111 {
1112         nfc_llc_exit();
1113 }
1114
1115 subsys_initcall(nfc_hci_init);
1116 module_exit(nfc_hci_exit);
1117
1118 MODULE_LICENSE("GPL");
1119 MODULE_DESCRIPTION("NFC HCI Core");