net/nfc/nci/core.c

   1 /*
   2  *  The NFC Controller Interface is the communication protocol between an
   3  *  NFC Controller (NFCC) and a Device Host (DH).
   4  *
   5  *  Copyright (C) 2011 Texas Instruments, Inc.
   6  *
   7  *  Written by Ilan Elias <ilane@ti.com>
   8  *
   9  *  Acknowledgements:
  10  *  This file is based on hci_core.c, which was written
  11  *  by Maxim Krasnyansky.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License version 2
  15  *  as published by the Free Software Foundation
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  */
  27
  28 #include <linux/types.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/completion.h>
  31 #include <linux/export.h>
  32 #include <linux/sched.h>
  33 #include <linux/bitops.h>
  34 #include <linux/skbuff.h>
  35
  36 #include "../nfc.h"
  37 #include <net/nfc/nci.h>
  38 #include <net/nfc/nci_core.h>
  39 #include <linux/nfc.h>
  40
  41 static void nci_cmd_work(struct work_struct *work);
  42 static void nci_rx_work(struct work_struct *work);
  43 static void nci_tx_work(struct work_struct *work);
  44
  45 /* ---- NCI requests ---- */
  46
  47 void nci_req_complete(struct nci_dev *ndev, int result)
  48 {
  49         if (ndev->req_status == NCI_REQ_PEND) {
  50                 ndev->req_result = result;
  51                 ndev->req_status = NCI_REQ_DONE;
  52                 complete(&ndev->req_completion);
  53         }
  54 }
  55
  56 static void nci_req_cancel(struct nci_dev *ndev, int err)
  57 {
  58         if (ndev->req_status == NCI_REQ_PEND) {
  59                 ndev->req_result = err;
  60                 ndev->req_status = NCI_REQ_CANCELED;
  61                 complete(&ndev->req_completion);
  62         }
  63 }
  64
  65 /* Execute request and wait for completion. */
  66 static int __nci_request(struct nci_dev *ndev,
  67         void (*req)(struct nci_dev *ndev, unsigned long opt),
  68         unsigned long opt,
  69         __u32 timeout)
  70 {
  71         int rc = 0;
  72         unsigned long completion_rc;
  73
  74         ndev->req_status = NCI_REQ_PEND;
  75
  76         init_completion(&ndev->req_completion);
  77         req(ndev, opt);
  78         completion_rc = wait_for_completion_interruptible_timeout(
  79                                                         &ndev->req_completion,
  80                                                         timeout);
  81
  82         nfc_dbg("wait_for_completion return %ld", completion_rc);
  83
  84         if (completion_rc > 0) {
  85                 switch (ndev->req_status) {
  86                 case NCI_REQ_DONE:
  87                         rc = nci_to_errno(ndev->req_result);
  88                         break;
  89
  90                 case NCI_REQ_CANCELED:
  91                         rc = -ndev->req_result;
  92                         break;
  93
  94                 default:
  95                         rc = -ETIMEDOUT;
  96                         break;
  97                 }
  98         } else {
  99                 nfc_err("wait_for_completion_interruptible_timeout failed %ld",
 100                         completion_rc);
 101
 102                 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
 103         }
 104
 105         ndev->req_status = ndev->req_result = 0;
 106
 107         return rc;
 108 }
 109
 110 static inline int nci_request(struct nci_dev *ndev,
 111                 void (*req)(struct nci_dev *ndev, unsigned long opt),
 112                 unsigned long opt, __u32 timeout)
 113 {
 114         int rc;
 115
 116         if (!test_bit(NCI_UP, &ndev->flags))
 117                 return -ENETDOWN;
 118
 119         /* Serialize all requests */
 120         mutex_lock(&ndev->req_lock);
 121         rc = __nci_request(ndev, req, opt, timeout);
 122         mutex_unlock(&ndev->req_lock);
 123
 124         return rc;
 125 }
 126
 127 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
 128 {
 129         struct nci_core_reset_cmd cmd;
 130
 131         cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
 132         nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
 133 }
 134
 135 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
 136 {
 137         nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
 138 }
 139
 140 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
 141 {
 142         struct nci_rf_disc_map_cmd cmd;
 143         struct disc_map_config *cfg = cmd.mapping_configs;
 144         __u8 *num = &cmd.num_mapping_configs;
 145         int i;
 146
 147         /* set rf mapping configurations */
 148         *num = 0;
 149
 150         /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
 151         for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
 152                 if (ndev->supported_rf_interfaces[i] ==
 153                         NCI_RF_INTERFACE_ISO_DEP) {
 154                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
 155                         cfg[*num].mode = NCI_DISC_MAP_MODE_BOTH;
 156                         cfg[*num].rf_interface_type = NCI_RF_INTERFACE_ISO_DEP;
 157                         (*num)++;
 158                 } else if (ndev->supported_rf_interfaces[i] ==
 159                         NCI_RF_INTERFACE_NFC_DEP) {
 160                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
 161                         cfg[*num].mode = NCI_DISC_MAP_MODE_BOTH;
 162                         cfg[*num].rf_interface_type = NCI_RF_INTERFACE_NFC_DEP;
 163                         (*num)++;
 164                 }
 165
 166                 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
 167                         break;
 168         }
 169
 170         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
 171                 (1 + ((*num)*sizeof(struct disc_map_config))),
 172                 &cmd);
 173 }
 174
 175 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
 176 {
 177         struct nci_rf_disc_cmd cmd;
 178         __u32 protocols = opt;
 179
 180         cmd.num_disc_configs = 0;
 181
 182         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 183                 (protocols & NFC_PROTO_JEWEL_MASK
 184                 || protocols & NFC_PROTO_MIFARE_MASK
 185                 || protocols & NFC_PROTO_ISO14443_MASK
 186                 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
 187                 cmd.disc_configs[cmd.num_disc_configs].type =
 188                 NCI_DISCOVERY_TYPE_POLL_A_PASSIVE;
 189                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 190                 cmd.num_disc_configs++;
 191         }
 192
 193         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 194                 (protocols & NFC_PROTO_ISO14443_MASK)) {
 195                 cmd.disc_configs[cmd.num_disc_configs].type =
 196                 NCI_DISCOVERY_TYPE_POLL_B_PASSIVE;
 197                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 198                 cmd.num_disc_configs++;
 199         }
 200
 201         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 202                 (protocols & NFC_PROTO_FELICA_MASK
 203                 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
 204                 cmd.disc_configs[cmd.num_disc_configs].type =
 205                 NCI_DISCOVERY_TYPE_POLL_F_PASSIVE;
 206                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 207                 cmd.num_disc_configs++;
 208         }
 209
 210         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
 211                 (1 + (cmd.num_disc_configs*sizeof(struct disc_config))),
 212                 &cmd);
 213 }
 214
 215 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
 216 {
 217         struct nci_rf_deactivate_cmd cmd;
 218
 219         cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
 220
 221         nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
 222                         sizeof(struct nci_rf_deactivate_cmd),
 223                         &cmd);
 224 }
 225
 226 static int nci_open_device(struct nci_dev *ndev)
 227 {
 228         int rc = 0;
 229
 230         mutex_lock(&ndev->req_lock);
 231
 232         if (test_bit(NCI_UP, &ndev->flags)) {
 233                 rc = -EALREADY;
 234                 goto done;
 235         }
 236
 237         if (ndev->ops->open(ndev)) {
 238                 rc = -EIO;
 239                 goto done;
 240         }
 241
 242         atomic_set(&ndev->cmd_cnt, 1);
 243
 244         set_bit(NCI_INIT, &ndev->flags);
 245
 246         rc = __nci_request(ndev, nci_reset_req, 0,
 247                                 msecs_to_jiffies(NCI_RESET_TIMEOUT));
 248
 249         if (!rc) {
 250                 rc = __nci_request(ndev, nci_init_req, 0,
 251                                 msecs_to_jiffies(NCI_INIT_TIMEOUT));
 252         }
 253
 254         if (!rc) {
 255                 rc = __nci_request(ndev, nci_init_complete_req, 0,
 256                                 msecs_to_jiffies(NCI_INIT_TIMEOUT));
 257         }
 258
 259         clear_bit(NCI_INIT, &ndev->flags);
 260
 261         if (!rc) {
 262                 set_bit(NCI_UP, &ndev->flags);
 263         } else {
 264                 /* Init failed, cleanup */
 265                 skb_queue_purge(&ndev->cmd_q);
 266                 skb_queue_purge(&ndev->rx_q);
 267                 skb_queue_purge(&ndev->tx_q);
 268
 269                 ndev->ops->close(ndev);
 270                 ndev->flags = 0;
 271         }
 272
 273 done:
 274         mutex_unlock(&ndev->req_lock);
 275         return rc;
 276 }
 277
 278 static int nci_close_device(struct nci_dev *ndev)
 279 {
 280         nci_req_cancel(ndev, ENODEV);
 281         mutex_lock(&ndev->req_lock);
 282
 283         if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
 284                 del_timer_sync(&ndev->cmd_timer);
 285                 mutex_unlock(&ndev->req_lock);
 286                 return 0;
 287         }
 288
 289         /* Drop RX and TX queues */
 290         skb_queue_purge(&ndev->rx_q);
 291         skb_queue_purge(&ndev->tx_q);
 292
 293         /* Flush RX and TX wq */
 294         flush_workqueue(ndev->rx_wq);
 295         flush_workqueue(ndev->tx_wq);
 296
 297         /* Reset device */
 298         skb_queue_purge(&ndev->cmd_q);
 299         atomic_set(&ndev->cmd_cnt, 1);
 300
 301         set_bit(NCI_INIT, &ndev->flags);
 302         __nci_request(ndev, nci_reset_req, 0,
 303                                 msecs_to_jiffies(NCI_RESET_TIMEOUT));
 304         clear_bit(NCI_INIT, &ndev->flags);
 305
 306         /* Flush cmd wq */
 307         flush_workqueue(ndev->cmd_wq);
 308
 309         /* After this point our queues are empty
 310          * and no works are scheduled. */
 311         ndev->ops->close(ndev);
 312
 313         /* Clear flags */
 314         ndev->flags = 0;
 315
 316         mutex_unlock(&ndev->req_lock);
 317
 318         return 0;
 319 }
 320
 321 /* NCI command timer function */
 322 static void nci_cmd_timer(unsigned long arg)
 323 {
 324         struct nci_dev *ndev = (void *) arg;
 325
 326         nfc_dbg("entry");
 327
 328         atomic_set(&ndev->cmd_cnt, 1);
 329         queue_work(ndev->cmd_wq, &ndev->cmd_work);
 330 }
 331
 332 static int nci_dev_up(struct nfc_dev *nfc_dev)
 333 {
 334         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 335
 336         nfc_dbg("entry");
 337
 338         return nci_open_device(ndev);
 339 }
 340
 341 static int nci_dev_down(struct nfc_dev *nfc_dev)
 342 {
 343         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 344
 345         nfc_dbg("entry");
 346
 347         return nci_close_device(ndev);
 348 }
 349
 350 static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
 351 {
 352         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 353         int rc;
 354
 355         nfc_dbg("entry");
 356
 357         if (test_bit(NCI_DISCOVERY, &ndev->flags)) {
 358                 nfc_err("unable to start poll, since poll is already active");
 359                 return -EBUSY;
 360         }
 361
 362         if (ndev->target_active_prot) {
 363                 nfc_err("there is an active target");
 364                 return -EBUSY;
 365         }
 366
 367         if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
 368                 nfc_dbg("target is active, implicitly deactivate...");
 369
 370                 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
 371                         msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 372                 if (rc)
 373                         return -EBUSY;
 374         }
 375
 376         rc = nci_request(ndev, nci_rf_discover_req, protocols,
 377                 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
 378
 379         if (!rc)
 380                 ndev->poll_prots = protocols;
 381
 382         return rc;
 383 }
 384
 385 static void nci_stop_poll(struct nfc_dev *nfc_dev)
 386 {
 387         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 388
 389         nfc_dbg("entry");
 390
 391         if (!test_bit(NCI_DISCOVERY, &ndev->flags)) {
 392                 nfc_err("unable to stop poll, since poll is not active");
 393                 return;
 394         }
 395
 396         nci_request(ndev, nci_rf_deactivate_req, 0,
 397                 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 398 }
 399
 400 static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
 401                                 __u32 protocol)
 402 {
 403         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 404
 405         nfc_dbg("entry, target_idx %d, protocol 0x%x", target_idx, protocol);
 406
 407         if (!test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
 408                 nfc_err("there is no available target to activate");
 409                 return -EINVAL;
 410         }
 411
 412         if (ndev->target_active_prot) {
 413                 nfc_err("there is already an active target");
 414                 return -EBUSY;
 415         }
 416
 417         if (!(ndev->target_available_prots & (1 << protocol))) {
 418                 nfc_err("target does not support the requested protocol 0x%x",
 419                         protocol);
 420                 return -EINVAL;
 421         }
 422
 423         ndev->target_active_prot = protocol;
 424         ndev->target_available_prots = 0;
 425
 426         return 0;
 427 }
 428
 429 static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)
 430 {
 431         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 432
 433         nfc_dbg("entry, target_idx %d", target_idx);
 434
 435         if (!ndev->target_active_prot) {
 436                 nfc_err("unable to deactivate target, no active target");
 437                 return;
 438         }
 439
 440         ndev->target_active_prot = 0;
 441
 442         if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
 443                 nci_request(ndev, nci_rf_deactivate_req, 0,
 444                         msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 445         }
 446 }
 447
 448 static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx,
 449                                                 struct sk_buff *skb,
 450                                                 data_exchange_cb_t cb,
 451                                                 void *cb_context)
 452 {
 453         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 454         int rc;
 455
 456         nfc_dbg("entry, target_idx %d, len %d", target_idx, skb->len);
 457
 458         if (!ndev->target_active_prot) {
 459                 nfc_err("unable to exchange data, no active target");
 460                 return -EINVAL;
 461         }
 462
 463         if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 464                 return -EBUSY;
 465
 466         /* store cb and context to be used on receiving data */
 467         ndev->data_exchange_cb = cb;
 468         ndev->data_exchange_cb_context = cb_context;
 469
 470         rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
 471         if (rc)
 472                 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
 473
 474         return rc;
 475 }
 476
 477 static struct nfc_ops nci_nfc_ops = {
 478         .dev_up = nci_dev_up,
 479         .dev_down = nci_dev_down,
 480         .start_poll = nci_start_poll,
 481         .stop_poll = nci_stop_poll,
 482         .activate_target = nci_activate_target,
 483         .deactivate_target = nci_deactivate_target,
 484         .data_exchange = nci_data_exchange,
 485 };
 486
 487 /* ---- Interface to NCI drivers ---- */
 488
 489 /**
 490  * nci_allocate_device - allocate a new nci device
 491  *
 492  * @ops: device operations
 493  * @supported_protocols: NFC protocols supported by the device
 494  */
 495 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
 496                                         __u32 supported_protocols,
 497                                         int tx_headroom,
 498                                         int tx_tailroom)
 499 {
 500         struct nci_dev *ndev;
 501
 502         nfc_dbg("entry, supported_protocols 0x%x", supported_protocols);
 503
 504         if (!ops->open || !ops->close || !ops->send)
 505                 return NULL;
 506
 507         if (!supported_protocols)
 508                 return NULL;
 509
 510         ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
 511         if (!ndev)
 512                 return NULL;
 513
 514         ndev->ops = ops;
 515         ndev->tx_headroom = tx_headroom;
 516         ndev->tx_tailroom = tx_tailroom;
 517
 518         ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
 519                                                 supported_protocols,
 520                                                 tx_headroom + NCI_DATA_HDR_SIZE,
 521                                                 tx_tailroom);
 522         if (!ndev->nfc_dev)
 523                 goto free_exit;
 524
 525         nfc_set_drvdata(ndev->nfc_dev, ndev);
 526
 527         return ndev;
 528
 529 free_exit:
 530         kfree(ndev);
 531         return NULL;
 532 }
 533 EXPORT_SYMBOL(nci_allocate_device);
 534
 535 /**
 536  * nci_free_device - deallocate nci device
 537  *
 538  * @ndev: The nci device to deallocate
 539  */
 540 void nci_free_device(struct nci_dev *ndev)
 541 {
 542         nfc_dbg("entry");
 543
 544         nfc_free_device(ndev->nfc_dev);
 545         kfree(ndev);
 546 }
 547 EXPORT_SYMBOL(nci_free_device);
 548
 549 /**
 550  * nci_register_device - register a nci device in the nfc subsystem
 551  *
 552  * @dev: The nci device to register
 553  */
 554 int nci_register_device(struct nci_dev *ndev)
 555 {
 556         int rc;
 557         struct device *dev = &ndev->nfc_dev->dev;
 558         char name[32];
 559
 560         nfc_dbg("entry");
 561
 562         rc = nfc_register_device(ndev->nfc_dev);
 563         if (rc)
 564                 goto exit;
 565
 566         ndev->flags = 0;
 567
 568         INIT_WORK(&ndev->cmd_work, nci_cmd_work);
 569         snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
 570         ndev->cmd_wq = create_singlethread_workqueue(name);
 571         if (!ndev->cmd_wq) {
 572                 rc = -ENOMEM;
 573                 goto unreg_exit;
 574         }
 575
 576         INIT_WORK(&ndev->rx_work, nci_rx_work);
 577         snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
 578         ndev->rx_wq = create_singlethread_workqueue(name);
 579         if (!ndev->rx_wq) {
 580                 rc = -ENOMEM;
 581                 goto destroy_cmd_wq_exit;
 582         }
 583
 584         INIT_WORK(&ndev->tx_work, nci_tx_work);
 585         snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
 586         ndev->tx_wq = create_singlethread_workqueue(name);
 587         if (!ndev->tx_wq) {
 588                 rc = -ENOMEM;
 589                 goto destroy_rx_wq_exit;
 590         }
 591
 592         skb_queue_head_init(&ndev->cmd_q);
 593         skb_queue_head_init(&ndev->rx_q);
 594         skb_queue_head_init(&ndev->tx_q);
 595
 596         setup_timer(&ndev->cmd_timer, nci_cmd_timer,
 597                         (unsigned long) ndev);
 598
 599         mutex_init(&ndev->req_lock);
 600
 601         goto exit;
 602
 603 destroy_rx_wq_exit:
 604         destroy_workqueue(ndev->rx_wq);
 605
 606 destroy_cmd_wq_exit:
 607         destroy_workqueue(ndev->cmd_wq);
 608
 609 unreg_exit:
 610         nfc_unregister_device(ndev->nfc_dev);
 611
 612 exit:
 613         return rc;
 614 }
 615 EXPORT_SYMBOL(nci_register_device);
 616
 617 /**
 618  * nci_unregister_device - unregister a nci device in the nfc subsystem
 619  *
 620  * @dev: The nci device to unregister
 621  */
 622 void nci_unregister_device(struct nci_dev *ndev)
 623 {
 624         nfc_dbg("entry");
 625
 626         nci_close_device(ndev);
 627
 628         destroy_workqueue(ndev->cmd_wq);
 629         destroy_workqueue(ndev->rx_wq);
 630         destroy_workqueue(ndev->tx_wq);
 631
 632         nfc_unregister_device(ndev->nfc_dev);
 633 }
 634 EXPORT_SYMBOL(nci_unregister_device);
 635
 636 /**
 637  * nci_recv_frame - receive frame from NCI drivers
 638  *
 639  * @skb: The sk_buff to receive
 640  */
 641 int nci_recv_frame(struct sk_buff *skb)
 642 {
 643         struct nci_dev *ndev = (struct nci_dev *) skb->dev;
 644
 645         nfc_dbg("entry, len %d", skb->len);
 646
 647         if (!ndev || (!test_bit(NCI_UP, &ndev->flags)
 648                 && !test_bit(NCI_INIT, &ndev->flags))) {
 649                 kfree_skb(skb);
 650                 return -ENXIO;
 651         }
 652
 653         /* Queue frame for rx worker thread */
 654         skb_queue_tail(&ndev->rx_q, skb);
 655         queue_work(ndev->rx_wq, &ndev->rx_work);
 656
 657         return 0;
 658 }
 659 EXPORT_SYMBOL(nci_recv_frame);
 660
 661 static int nci_send_frame(struct sk_buff *skb)
 662 {
 663         struct nci_dev *ndev = (struct nci_dev *) skb->dev;
 664
 665         nfc_dbg("entry, len %d", skb->len);
 666
 667         if (!ndev) {
 668                 kfree_skb(skb);
 669                 return -ENODEV;
 670         }
 671
 672         /* Get rid of skb owner, prior to sending to the driver. */
 673         skb_orphan(skb);
 674
 675         return ndev->ops->send(skb);
 676 }
 677
 678 /* Send NCI command */
 679 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
 680 {
 681         struct nci_ctrl_hdr *hdr;
 682         struct sk_buff *skb;
 683
 684         nfc_dbg("entry, opcode 0x%x, plen %d", opcode, plen);
 685
 686         skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
 687         if (!skb) {
 688                 nfc_err("no memory for command");
 689                 return -ENOMEM;
 690         }
 691
 692         hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
 693         hdr->gid = nci_opcode_gid(opcode);
 694         hdr->oid = nci_opcode_oid(opcode);
 695         hdr->plen = plen;
 696
 697         nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
 698         nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
 699
 700         if (plen)
 701                 memcpy(skb_put(skb, plen), payload, plen);
 702
 703         skb->dev = (void *) ndev;
 704
 705         skb_queue_tail(&ndev->cmd_q, skb);
 706         queue_work(ndev->cmd_wq, &ndev->cmd_work);
 707
 708         return 0;
 709 }
 710
 711 /* ---- NCI TX Data worker thread ---- */
 712
 713 static void nci_tx_work(struct work_struct *work)
 714 {
 715         struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
 716         struct sk_buff *skb;
 717
 718         nfc_dbg("entry, credits_cnt %d", atomic_read(&ndev->credits_cnt));
 719
 720         /* Send queued tx data */
 721         while (atomic_read(&ndev->credits_cnt)) {
 722                 skb = skb_dequeue(&ndev->tx_q);
 723                 if (!skb)
 724                         return;
 725
 726                 /* Check if data flow control is used */
 727                 if (atomic_read(&ndev->credits_cnt) !=
 728                                 NCI_DATA_FLOW_CONTROL_NOT_USED)
 729                         atomic_dec(&ndev->credits_cnt);
 730
 731                 nfc_dbg("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d",
 732                                 nci_pbf(skb->data),
 733                                 nci_conn_id(skb->data),
 734                                 nci_plen(skb->data));
 735
 736                 nci_send_frame(skb);
 737         }
 738 }
 739
 740 /* ----- NCI RX worker thread (data & control) ----- */
 741
 742 static void nci_rx_work(struct work_struct *work)
 743 {
 744         struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
 745         struct sk_buff *skb;
 746
 747         while ((skb = skb_dequeue(&ndev->rx_q))) {
 748                 /* Process frame */
 749                 switch (nci_mt(skb->data)) {
 750                 case NCI_MT_RSP_PKT:
 751                         nci_rsp_packet(ndev, skb);
 752                         break;
 753
 754                 case NCI_MT_NTF_PKT:
 755                         nci_ntf_packet(ndev, skb);
 756                         break;
 757
 758                 case NCI_MT_DATA_PKT:
 759                         nci_rx_data_packet(ndev, skb);
 760                         break;
 761
 762                 default:
 763                         nfc_err("unknown MT 0x%x", nci_mt(skb->data));
 764                         kfree_skb(skb);
 765                         break;
 766                 }
 767         }
 768 }
 769
 770 /* ----- NCI TX CMD worker thread ----- */
 771
 772 static void nci_cmd_work(struct work_struct *work)
 773 {
 774         struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
 775         struct sk_buff *skb;
 776
 777         nfc_dbg("entry, cmd_cnt %d", atomic_read(&ndev->cmd_cnt));
 778
 779         /* Send queued command */
 780         if (atomic_read(&ndev->cmd_cnt)) {
 781                 skb = skb_dequeue(&ndev->cmd_q);
 782                 if (!skb)
 783                         return;
 784
 785                 atomic_dec(&ndev->cmd_cnt);
 786
 787                 nfc_dbg("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
 788                                 nci_pbf(skb->data),
 789                                 nci_opcode_gid(nci_opcode(skb->data)),
 790                                 nci_opcode_oid(nci_opcode(skb->data)),
 791                                 nci_plen(skb->data));
 792
 793                 nci_send_frame(skb);
 794
 795                 mod_timer(&ndev->cmd_timer,
 796                         jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
 797         }
 798 }