linux/net/nfc/hci/core.c
<<
>>
Prefs
   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
  34int 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}
  47EXPORT_SYMBOL(nfc_hci_result_to_errno);
  48
  49void 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}
  59EXPORT_SYMBOL(nfc_hci_reset_pipes);
  60
  61void 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}
  73EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
  74
  75static 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
 102next_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
 134exit:
 135        mutex_unlock(&hdev->msg_tx_mutex);
 136}
 137
 138static 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
 160static 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
 177void 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
 189exit:
 190        mutex_unlock(&hdev->msg_tx_mutex);
 191}
 192
 193void 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
 255exit:
 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
 262u32 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}
 277EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
 278
 279int 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
 366exit:
 367        kfree(targets);
 368        kfree_skb(atqa_skb);
 369        kfree_skb(sak_skb);
 370        kfree_skb(uid_skb);
 371
 372        return r;
 373}
 374EXPORT_SYMBOL(nfc_hci_target_discovered);
 375
 376void 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
 423exit:
 424        kfree_skb(skb);
 425
 426exit_noskb:
 427        if (r)
 428                nfc_hci_driver_failure(hdev, r);
 429}
 430
 431static void nfc_hci_cmd_timeout(struct timer_list *t)
 432{
 433        struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
 434
 435        schedule_work(&hdev->msg_tx_work);
 436}
 437
 438static 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
 453static 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
 500disconnect_all:
 501        nfc_hci_disconnect_all_gates(hdev);
 502
 503exit:
 504        kfree_skb(skb);
 505
 506        return r;
 507}
 508
 509static 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
 568static 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
 604exit_llc:
 605        nfc_llc_stop(hdev->llc);
 606
 607exit_close:
 608        if (hdev->ops->close)
 609                hdev->ops->close(hdev);
 610
 611        return r;
 612}
 613
 614static 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
 628static 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
 641static 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
 652static 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
 664static 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
 674static int hci_activate_target(struct nfc_dev *nfc_dev,
 675                               struct nfc_target *target, u32 protocol)
 676{
 677        return 0;
 678}
 679
 680static 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
 688static 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
 711static 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                *(u8 *)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
 757static 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
 769static 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
 780static 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
 790static 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
 800static 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
 810static 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
 823static 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
 834exit:
 835        mutex_unlock(&hdev->msg_tx_mutex);
 836}
 837
 838static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
 839{
 840        nfc_hci_failure(hdev, err);
 841}
 842
 843static 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_u8(hcp_skb, 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                        skb_put_data(hcp_skb,
 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
 910static 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
 920static 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
 939struct 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}
 989EXPORT_SYMBOL(nfc_hci_allocate_device);
 990
 991void 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}
 997EXPORT_SYMBOL(nfc_hci_free_device);
 998
 999int 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        timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1008
1009        skb_queue_head_init(&hdev->rx_hcp_frags);
1010
1011        INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1012
1013        skb_queue_head_init(&hdev->msg_rx_queue);
1014
1015        return nfc_register_device(hdev->ndev);
1016}
1017EXPORT_SYMBOL(nfc_hci_register_device);
1018
1019void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1020{
1021        struct hci_msg *msg, *n;
1022
1023        mutex_lock(&hdev->msg_tx_mutex);
1024
1025        if (hdev->cmd_pending_msg) {
1026                if (hdev->cmd_pending_msg->cb)
1027                        hdev->cmd_pending_msg->cb(
1028                                             hdev->cmd_pending_msg->cb_context,
1029                                             NULL, -ESHUTDOWN);
1030                kfree(hdev->cmd_pending_msg);
1031                hdev->cmd_pending_msg = NULL;
1032        }
1033
1034        hdev->shutting_down = true;
1035
1036        mutex_unlock(&hdev->msg_tx_mutex);
1037
1038        del_timer_sync(&hdev->cmd_timer);
1039        cancel_work_sync(&hdev->msg_tx_work);
1040
1041        cancel_work_sync(&hdev->msg_rx_work);
1042
1043        nfc_unregister_device(hdev->ndev);
1044
1045        skb_queue_purge(&hdev->rx_hcp_frags);
1046        skb_queue_purge(&hdev->msg_rx_queue);
1047
1048        list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1049                list_del(&msg->msg_l);
1050                skb_queue_purge(&msg->msg_frags);
1051                kfree(msg);
1052        }
1053}
1054EXPORT_SYMBOL(nfc_hci_unregister_device);
1055
1056void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1057{
1058        hdev->clientdata = clientdata;
1059}
1060EXPORT_SYMBOL(nfc_hci_set_clientdata);
1061
1062void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1063{
1064        return hdev->clientdata;
1065}
1066EXPORT_SYMBOL(nfc_hci_get_clientdata);
1067
1068void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1069{
1070        nfc_hci_failure(hdev, err);
1071}
1072EXPORT_SYMBOL(nfc_hci_driver_failure);
1073
1074void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1075{
1076        nfc_llc_rcv_from_drv(hdev->llc, skb);
1077}
1078EXPORT_SYMBOL(nfc_hci_recv_frame);
1079
1080static int __init nfc_hci_init(void)
1081{
1082        return nfc_llc_init();
1083}
1084
1085static void __exit nfc_hci_exit(void)
1086{
1087        nfc_llc_exit();
1088}
1089
1090subsys_initcall(nfc_hci_init);
1091module_exit(nfc_hci_exit);
1092
1093MODULE_LICENSE("GPL");
1094MODULE_DESCRIPTION("NFC HCI Core");
1095