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