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 ": " fmt
  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         unsigned 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_BOTH;
 158                         cfg[*num].rf_interface_type = NCI_RF_INTERFACE_ISO_DEP;
 159                         (*num)++;
 160                 } else if (ndev->supported_rf_interfaces[i] ==
 161                         NCI_RF_INTERFACE_NFC_DEP) {
 162                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
 163                         cfg[*num].mode = NCI_DISC_MAP_MODE_BOTH;
 164                         cfg[*num].rf_interface_type = NCI_RF_INTERFACE_NFC_DEP;
 165                         (*num)++;
 166                 }
 167
 168                 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
 169                         break;
 170         }
 171
 172         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
 173                 (1 + ((*num)*sizeof(struct disc_map_config))),
 174                 &cmd);
 175 }
 176
 177 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
 178 {
 179         struct nci_rf_disc_cmd cmd;
 180         __u32 protocols = opt;
 181
 182         cmd.num_disc_configs = 0;
 183
 184         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 185                 (protocols & NFC_PROTO_JEWEL_MASK
 186                 || protocols & NFC_PROTO_MIFARE_MASK
 187                 || protocols & NFC_PROTO_ISO14443_MASK
 188                 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
 189                 cmd.disc_configs[cmd.num_disc_configs].type =
 190                 NCI_DISCOVERY_TYPE_POLL_A_PASSIVE;
 191                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 192                 cmd.num_disc_configs++;
 193         }
 194
 195         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 196                 (protocols & NFC_PROTO_ISO14443_MASK)) {
 197                 cmd.disc_configs[cmd.num_disc_configs].type =
 198                 NCI_DISCOVERY_TYPE_POLL_B_PASSIVE;
 199                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 200                 cmd.num_disc_configs++;
 201         }
 202
 203         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 204                 (protocols & NFC_PROTO_FELICA_MASK
 205                 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
 206                 cmd.disc_configs[cmd.num_disc_configs].type =
 207                 NCI_DISCOVERY_TYPE_POLL_F_PASSIVE;
 208                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 209                 cmd.num_disc_configs++;
 210         }
 211
 212         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
 213                 (1 + (cmd.num_disc_configs*sizeof(struct disc_config))),
 214                 &cmd);
 215 }
 216
 217 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
 218 {
 219         struct nci_rf_deactivate_cmd cmd;
 220
 221         cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
 222
 223         nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
 224                         sizeof(struct nci_rf_deactivate_cmd),
 225                         &cmd);
 226 }
 227
 228 static int nci_open_device(struct nci_dev *ndev)
 229 {
 230         int rc = 0;
 231
 232         mutex_lock(&ndev->req_lock);
 233
 234         if (test_bit(NCI_UP, &ndev->flags)) {
 235                 rc = -EALREADY;
 236                 goto done;
 237         }
 238
 239         if (ndev->ops->open(ndev)) {
 240                 rc = -EIO;
 241                 goto done;
 242         }
 243
 244         atomic_set(&ndev->cmd_cnt, 1);
 245
 246         set_bit(NCI_INIT, &ndev->flags);
 247
 248         rc = __nci_request(ndev, nci_reset_req, 0,
 249                                 msecs_to_jiffies(NCI_RESET_TIMEOUT));
 250
 251         if (!rc) {
 252                 rc = __nci_request(ndev, nci_init_req, 0,
 253                                 msecs_to_jiffies(NCI_INIT_TIMEOUT));
 254         }
 255
 256         if (!rc) {
 257                 rc = __nci_request(ndev, nci_init_complete_req, 0,
 258                                 msecs_to_jiffies(NCI_INIT_TIMEOUT));
 259         }
 260
 261         clear_bit(NCI_INIT, &ndev->flags);
 262
 263         if (!rc) {
 264                 set_bit(NCI_UP, &ndev->flags);
 265         } else {
 266                 /* Init failed, cleanup */
 267                 skb_queue_purge(&ndev->cmd_q);
 268                 skb_queue_purge(&ndev->rx_q);
 269                 skb_queue_purge(&ndev->tx_q);
 270
 271                 ndev->ops->close(ndev);
 272                 ndev->flags = 0;
 273         }
 274
 275 done:
 276         mutex_unlock(&ndev->req_lock);
 277         return rc;
 278 }
 279
 280 static int nci_close_device(struct nci_dev *ndev)
 281 {
 282         nci_req_cancel(ndev, ENODEV);
 283         mutex_lock(&ndev->req_lock);
 284
 285         if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
 286                 del_timer_sync(&ndev->cmd_timer);
 287                 mutex_unlock(&ndev->req_lock);
 288                 return 0;
 289         }
 290
 291         /* Drop RX and TX queues */
 292         skb_queue_purge(&ndev->rx_q);
 293         skb_queue_purge(&ndev->tx_q);
 294
 295         /* Flush RX and TX wq */
 296         flush_workqueue(ndev->rx_wq);
 297         flush_workqueue(ndev->tx_wq);
 298
 299         /* Reset device */
 300         skb_queue_purge(&ndev->cmd_q);
 301         atomic_set(&ndev->cmd_cnt, 1);
 302
 303         set_bit(NCI_INIT, &ndev->flags);
 304         __nci_request(ndev, nci_reset_req, 0,
 305                                 msecs_to_jiffies(NCI_RESET_TIMEOUT));
 306         clear_bit(NCI_INIT, &ndev->flags);
 307
 308         /* Flush cmd wq */
 309         flush_workqueue(ndev->cmd_wq);
 310
 311         /* After this point our queues are empty
 312          * and no works are scheduled. */
 313         ndev->ops->close(ndev);
 314
 315         /* Clear flags */
 316         ndev->flags = 0;
 317
 318         mutex_unlock(&ndev->req_lock);
 319
 320         return 0;
 321 }
 322
 323 /* NCI command timer function */
 324 static void nci_cmd_timer(unsigned long arg)
 325 {
 326         struct nci_dev *ndev = (void *) arg;
 327
 328         pr_debug("entry\n");
 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         pr_debug("entry\n");
 339
 340         return nci_open_device(ndev);
 341 }
 342
 343 static int nci_dev_down(struct nfc_dev *nfc_dev)
 344 {
 345         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 346
 347         pr_debug("entry\n");
 348
 349         return nci_close_device(ndev);
 350 }
 351
 352 static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
 353 {
 354         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 355         int rc;
 356
 357         pr_debug("entry\n");
 358
 359         if (test_bit(NCI_DISCOVERY, &ndev->flags)) {
 360                 pr_err("unable to start poll, since poll is already active\n");
 361                 return -EBUSY;
 362         }
 363
 364         if (ndev->target_active_prot) {
 365                 pr_err("there is an active target\n");
 366                 return -EBUSY;
 367         }
 368
 369         if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
 370                 pr_debug("target is active, implicitly deactivate...\n");
 371
 372                 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
 373                         msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 374                 if (rc)
 375                         return -EBUSY;
 376         }
 377
 378         rc = nci_request(ndev, nci_rf_discover_req, protocols,
 379                 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
 380
 381         if (!rc)
 382                 ndev->poll_prots = protocols;
 383
 384         return rc;
 385 }
 386
 387 static void nci_stop_poll(struct nfc_dev *nfc_dev)
 388 {
 389         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 390
 391         pr_debug("entry\n");
 392
 393         if (!test_bit(NCI_DISCOVERY, &ndev->flags)) {
 394                 pr_err("unable to stop poll, since poll is not active\n");
 395                 return;
 396         }
 397
 398         nci_request(ndev, nci_rf_deactivate_req, 0,
 399                 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 400 }
 401
 402 static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
 403                                 __u32 protocol)
 404 {
 405         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 406
 407         pr_debug("entry, target_idx %d, protocol 0x%x\n", target_idx, protocol);
 408
 409         if (!test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
 410                 pr_err("there is no available target to activate\n");
 411                 return -EINVAL;
 412         }
 413
 414         if (ndev->target_active_prot) {
 415                 pr_err("there is already an active target\n");
 416                 return -EBUSY;
 417         }
 418
 419         if (!(ndev->target_available_prots & (1 << protocol))) {
 420                 pr_err("target does not support the requested protocol 0x%x\n",
 421                        protocol);
 422                 return -EINVAL;
 423         }
 424
 425         ndev->target_active_prot = protocol;
 426         ndev->target_available_prots = 0;
 427
 428         return 0;
 429 }
 430
 431 static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)
 432 {
 433         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 434
 435         pr_debug("entry, target_idx %d\n", target_idx);
 436
 437         if (!ndev->target_active_prot) {
 438                 pr_err("unable to deactivate target, no active target\n");
 439                 return;
 440         }
 441
 442         ndev->target_active_prot = 0;
 443
 444         if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
 445                 nci_request(ndev, nci_rf_deactivate_req, 0,
 446                         msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 447         }
 448 }
 449
 450 static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx,
 451                                                 struct sk_buff *skb,
 452                                                 data_exchange_cb_t cb,
 453                                                 void *cb_context)
 454 {
 455         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 456         int rc;
 457
 458         pr_debug("entry, target_idx %d, len %d\n", target_idx, skb->len);
 459
 460         if (!ndev->target_active_prot) {
 461                 pr_err("unable to exchange data, no active target\n");
 462                 return -EINVAL;
 463         }
 464
 465         if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 466                 return -EBUSY;
 467
 468         /* store cb and context to be used on receiving data */
 469         ndev->data_exchange_cb = cb;
 470         ndev->data_exchange_cb_context = cb_context;
 471
 472         rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
 473         if (rc)
 474                 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
 475
 476         return rc;
 477 }
 478
 479 static struct nfc_ops nci_nfc_ops = {
 480         .dev_up = nci_dev_up,
 481         .dev_down = nci_dev_down,
 482         .start_poll = nci_start_poll,
 483         .stop_poll = nci_stop_poll,
 484         .activate_target = nci_activate_target,
 485         .deactivate_target = nci_deactivate_target,
 486         .data_exchange = nci_data_exchange,
 487 };
 488
 489 /* ---- Interface to NCI drivers ---- */
 490
 491 /**
 492  * nci_allocate_device - allocate a new nci device
 493  *
 494  * @ops: device operations
 495  * @supported_protocols: NFC protocols supported by the device
 496  */
 497 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
 498                                         __u32 supported_protocols,
 499                                         int tx_headroom,
 500                                         int tx_tailroom)
 501 {
 502         struct nci_dev *ndev;
 503
 504         pr_debug("entry, supported_protocols 0x%x\n", supported_protocols);
 505
 506         if (!ops->open || !ops->close || !ops->send)
 507                 return NULL;
 508
 509         if (!supported_protocols)
 510                 return NULL;
 511
 512         ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
 513         if (!ndev)
 514                 return NULL;
 515
 516         ndev->ops = ops;
 517         ndev->tx_headroom = tx_headroom;
 518         ndev->tx_tailroom = tx_tailroom;
 519
 520         ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
 521                                                 supported_protocols,
 522                                                 tx_headroom + NCI_DATA_HDR_SIZE,
 523                                                 tx_tailroom);
 524         if (!ndev->nfc_dev)
 525                 goto free_exit;
 526
 527         nfc_set_drvdata(ndev->nfc_dev, ndev);
 528
 529         return ndev;
 530
 531 free_exit:
 532         kfree(ndev);
 533         return NULL;
 534 }
 535 EXPORT_SYMBOL(nci_allocate_device);
 536
 537 /**
 538  * nci_free_device - deallocate nci device
 539  *
 540  * @ndev: The nci device to deallocate
 541  */
 542 void nci_free_device(struct nci_dev *ndev)
 543 {
 544         pr_debug("entry\n");
 545
 546         nfc_free_device(ndev->nfc_dev);
 547         kfree(ndev);
 548 }
 549 EXPORT_SYMBOL(nci_free_device);
 550
 551 /**
 552  * nci_register_device - register a nci device in the nfc subsystem
 553  *
 554  * @dev: The nci device to register
 555  */
 556 int nci_register_device(struct nci_dev *ndev)
 557 {
 558         int rc;
 559         struct device *dev = &ndev->nfc_dev->dev;
 560         char name[32];
 561
 562         pr_debug("entry\n");
 563
 564         rc = nfc_register_device(ndev->nfc_dev);
 565         if (rc)
 566                 goto exit;
 567
 568         ndev->flags = 0;
 569
 570         INIT_WORK(&ndev->cmd_work, nci_cmd_work);
 571         snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
 572         ndev->cmd_wq = create_singlethread_workqueue(name);
 573         if (!ndev->cmd_wq) {
 574                 rc = -ENOMEM;
 575                 goto unreg_exit;
 576         }
 577
 578         INIT_WORK(&ndev->rx_work, nci_rx_work);
 579         snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
 580         ndev->rx_wq = create_singlethread_workqueue(name);
 581         if (!ndev->rx_wq) {
 582                 rc = -ENOMEM;
 583                 goto destroy_cmd_wq_exit;
 584         }
 585
 586         INIT_WORK(&ndev->tx_work, nci_tx_work);
 587         snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
 588         ndev->tx_wq = create_singlethread_workqueue(name);
 589         if (!ndev->tx_wq) {
 590                 rc = -ENOMEM;
 591                 goto destroy_rx_wq_exit;
 592         }
 593
 594         skb_queue_head_init(&ndev->cmd_q);
 595         skb_queue_head_init(&ndev->rx_q);
 596         skb_queue_head_init(&ndev->tx_q);
 597
 598         setup_timer(&ndev->cmd_timer, nci_cmd_timer,
 599                         (unsigned long) ndev);
 600
 601         mutex_init(&ndev->req_lock);
 602
 603         goto exit;
 604
 605 destroy_rx_wq_exit:
 606         destroy_workqueue(ndev->rx_wq);
 607
 608 destroy_cmd_wq_exit:
 609         destroy_workqueue(ndev->cmd_wq);
 610
 611 unreg_exit:
 612         nfc_unregister_device(ndev->nfc_dev);
 613
 614 exit:
 615         return rc;
 616 }
 617 EXPORT_SYMBOL(nci_register_device);
 618
 619 /**
 620  * nci_unregister_device - unregister a nci device in the nfc subsystem
 621  *
 622  * @dev: The nci device to unregister
 623  */
 624 void nci_unregister_device(struct nci_dev *ndev)
 625 {
 626         pr_debug("entry\n");
 627
 628         nci_close_device(ndev);
 629
 630         destroy_workqueue(ndev->cmd_wq);
 631         destroy_workqueue(ndev->rx_wq);
 632         destroy_workqueue(ndev->tx_wq);
 633
 634         nfc_unregister_device(ndev->nfc_dev);
 635 }
 636 EXPORT_SYMBOL(nci_unregister_device);
 637
 638 /**
 639  * nci_recv_frame - receive frame from NCI drivers
 640  *
 641  * @skb: The sk_buff to receive
 642  */
 643 int nci_recv_frame(struct sk_buff *skb)
 644 {
 645         struct nci_dev *ndev = (struct nci_dev *) skb->dev;
 646
 647         pr_debug("entry, len %d\n", skb->len);
 648
 649         if (!ndev || (!test_bit(NCI_UP, &ndev->flags)
 650                 && !test_bit(NCI_INIT, &ndev->flags))) {
 651                 kfree_skb(skb);
 652                 return -ENXIO;
 653         }
 654
 655         /* Queue frame for rx worker thread */
 656         skb_queue_tail(&ndev->rx_q, skb);
 657         queue_work(ndev->rx_wq, &ndev->rx_work);
 658
 659         return 0;
 660 }
 661 EXPORT_SYMBOL(nci_recv_frame);
 662
 663 static int nci_send_frame(struct sk_buff *skb)
 664 {
 665         struct nci_dev *ndev = (struct nci_dev *) skb->dev;
 666
 667         pr_debug("entry, len %d\n", skb->len);
 668
 669         if (!ndev) {
 670                 kfree_skb(skb);
 671                 return -ENODEV;
 672         }
 673
 674         /* Get rid of skb owner, prior to sending to the driver. */
 675         skb_orphan(skb);
 676
 677         return ndev->ops->send(skb);
 678 }
 679
 680 /* Send NCI command */
 681 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
 682 {
 683         struct nci_ctrl_hdr *hdr;
 684         struct sk_buff *skb;
 685
 686         pr_debug("entry, opcode 0x%x, plen %d\n", opcode, plen);
 687
 688         skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
 689         if (!skb) {
 690                 pr_err("no memory for command\n");
 691                 return -ENOMEM;
 692         }
 693
 694         hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
 695         hdr->gid = nci_opcode_gid(opcode);
 696         hdr->oid = nci_opcode_oid(opcode);
 697         hdr->plen = plen;
 698
 699         nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
 700         nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
 701
 702         if (plen)
 703                 memcpy(skb_put(skb, plen), payload, plen);
 704
 705         skb->dev = (void *) ndev;
 706
 707         skb_queue_tail(&ndev->cmd_q, skb);
 708         queue_work(ndev->cmd_wq, &ndev->cmd_work);
 709
 710         return 0;
 711 }
 712
 713 /* ---- NCI TX Data worker thread ---- */
 714
 715 static void nci_tx_work(struct work_struct *work)
 716 {
 717         struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
 718         struct sk_buff *skb;
 719
 720         pr_debug("entry, credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
 721
 722         /* Send queued tx data */
 723         while (atomic_read(&ndev->credits_cnt)) {
 724                 skb = skb_dequeue(&ndev->tx_q);
 725                 if (!skb)
 726                         return;
 727
 728                 /* Check if data flow control is used */
 729                 if (atomic_read(&ndev->credits_cnt) !=
 730                                 NCI_DATA_FLOW_CONTROL_NOT_USED)
 731                         atomic_dec(&ndev->credits_cnt);
 732
 733                 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
 734                          nci_pbf(skb->data),
 735                          nci_conn_id(skb->data),
 736                          nci_plen(skb->data));
 737
 738                 nci_send_frame(skb);
 739         }
 740 }
 741
 742 /* ----- NCI RX worker thread (data & control) ----- */
 743
 744 static void nci_rx_work(struct work_struct *work)
 745 {
 746         struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
 747         struct sk_buff *skb;
 748
 749         while ((skb = skb_dequeue(&ndev->rx_q))) {
 750                 /* Process frame */
 751                 switch (nci_mt(skb->data)) {
 752                 case NCI_MT_RSP_PKT:
 753                         nci_rsp_packet(ndev, skb);
 754                         break;
 755
 756                 case NCI_MT_NTF_PKT:
 757                         nci_ntf_packet(ndev, skb);
 758                         break;
 759
 760                 case NCI_MT_DATA_PKT:
 761                         nci_rx_data_packet(ndev, skb);
 762                         break;
 763
 764                 default:
 765                         pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
 766                         kfree_skb(skb);
 767                         break;
 768                 }
 769         }
 770 }
 771
 772 /* ----- NCI TX CMD worker thread ----- */
 773
 774 static void nci_cmd_work(struct work_struct *work)
 775 {
 776         struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
 777         struct sk_buff *skb;
 778
 779         pr_debug("entry, cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
 780
 781         /* Send queued command */
 782         if (atomic_read(&ndev->cmd_cnt)) {
 783                 skb = skb_dequeue(&ndev->cmd_q);
 784                 if (!skb)
 785                         return;
 786
 787                 atomic_dec(&ndev->cmd_cnt);
 788
 789                 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 790                          nci_pbf(skb->data),
 791                          nci_opcode_gid(nci_opcode(skb->data)),
 792                          nci_opcode_oid(nci_opcode(skb->data)),
 793                          nci_plen(skb->data));
 794
 795                 nci_send_frame(skb);
 796
 797                 mod_timer(&ndev->cmd_timer,
 798                         jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
 799         }
 800 }