net/nfc/nci/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  The NFC Controller Interface is the communication protocol between an
   4  *  NFC Controller (NFCC) and a Device Host (DH).
   5  *
   6  *  Copyright (C) 2011 Texas Instruments, Inc.
   7  *  Copyright (C) 2014 Marvell International Ltd.
   8  *
   9  *  Written by Ilan Elias <ilane@ti.com>
  10  *
  11  *  Acknowledgements:
  12  *  This file is based on hci_core.c, which was written
  13  *  by Maxim Krasnyansky.
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/completion.h>
  23 #include <linux/export.h>
  24 #include <linux/sched.h>
  25 #include <linux/bitops.h>
  26 #include <linux/skbuff.h>
  27
  28 #include "../nfc.h"
  29 #include <net/nfc/nci.h>
  30 #include <net/nfc/nci_core.h>
  31 #include <linux/nfc.h>
  32
  33 struct core_conn_create_data {
  34         int length;
  35         struct nci_core_conn_create_cmd *cmd;
  36 };
  37
  38 static void nci_cmd_work(struct work_struct *work);
  39 static void nci_rx_work(struct work_struct *work);
  40 static void nci_tx_work(struct work_struct *work);
  41
  42 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
  43                                                    int conn_id)
  44 {
  45         struct nci_conn_info *conn_info;
  46
  47         list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
  48                 if (conn_info->conn_id == conn_id)
  49                         return conn_info;
  50         }
  51
  52         return NULL;
  53 }
  54
  55 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
  56                                           struct dest_spec_params *params)
  57 {
  58         struct nci_conn_info *conn_info;
  59
  60         list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
  61                 if (conn_info->dest_type == dest_type) {
  62                         if (!params)
  63                                 return conn_info->conn_id;
  64
  65                         if (params->id == conn_info->dest_params->id &&
  66                             params->protocol == conn_info->dest_params->protocol)
  67                                 return conn_info->conn_id;
  68                 }
  69         }
  70
  71         return -EINVAL;
  72 }
  73 EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
  74
  75 /* ---- NCI requests ---- */
  76
  77 void nci_req_complete(struct nci_dev *ndev, int result)
  78 {
  79         if (ndev->req_status == NCI_REQ_PEND) {
  80                 ndev->req_result = result;
  81                 ndev->req_status = NCI_REQ_DONE;
  82                 complete(&ndev->req_completion);
  83         }
  84 }
  85 EXPORT_SYMBOL(nci_req_complete);
  86
  87 static void nci_req_cancel(struct nci_dev *ndev, int err)
  88 {
  89         if (ndev->req_status == NCI_REQ_PEND) {
  90                 ndev->req_result = err;
  91                 ndev->req_status = NCI_REQ_CANCELED;
  92                 complete(&ndev->req_completion);
  93         }
  94 }
  95
  96 /* Execute request and wait for completion. */
  97 static int __nci_request(struct nci_dev *ndev,
  98                          void (*req)(struct nci_dev *ndev, unsigned long opt),
  99                          unsigned long opt, __u32 timeout)
 100 {
 101         int rc = 0;
 102         long completion_rc;
 103
 104         ndev->req_status = NCI_REQ_PEND;
 105
 106         reinit_completion(&ndev->req_completion);
 107         req(ndev, opt);
 108         completion_rc =
 109                 wait_for_completion_interruptible_timeout(&ndev->req_completion,
 110                                                           timeout);
 111
 112         pr_debug("wait_for_completion return %ld\n", completion_rc);
 113
 114         if (completion_rc > 0) {
 115                 switch (ndev->req_status) {
 116                 case NCI_REQ_DONE:
 117                         rc = nci_to_errno(ndev->req_result);
 118                         break;
 119
 120                 case NCI_REQ_CANCELED:
 121                         rc = -ndev->req_result;
 122                         break;
 123
 124                 default:
 125                         rc = -ETIMEDOUT;
 126                         break;
 127                 }
 128         } else {
 129                 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
 130                        completion_rc);
 131
 132                 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
 133         }
 134
 135         ndev->req_status = ndev->req_result = 0;
 136
 137         return rc;
 138 }
 139
 140 inline int nci_request(struct nci_dev *ndev,
 141                        void (*req)(struct nci_dev *ndev,
 142                                    unsigned long opt),
 143                        unsigned long opt, __u32 timeout)
 144 {
 145         int rc;
 146
 147         if (!test_bit(NCI_UP, &ndev->flags))
 148                 return -ENETDOWN;
 149
 150         /* Serialize all requests */
 151         mutex_lock(&ndev->req_lock);
 152         rc = __nci_request(ndev, req, opt, timeout);
 153         mutex_unlock(&ndev->req_lock);
 154
 155         return rc;
 156 }
 157
 158 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
 159 {
 160         struct nci_core_reset_cmd cmd;
 161
 162         cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
 163         nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
 164 }
 165
 166 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
 167 {
 168         u8 plen = 0;
 169
 170         if (opt)
 171                 plen = sizeof(struct nci_core_init_v2_cmd);
 172
 173         nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, plen, (void *)opt);
 174 }
 175
 176 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
 177 {
 178         struct nci_rf_disc_map_cmd cmd;
 179         struct disc_map_config *cfg = cmd.mapping_configs;
 180         __u8 *num = &cmd.num_mapping_configs;
 181         int i;
 182
 183         /* set rf mapping configurations */
 184         *num = 0;
 185
 186         /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
 187         for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
 188                 if (ndev->supported_rf_interfaces[i] ==
 189                     NCI_RF_INTERFACE_ISO_DEP) {
 190                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
 191                         cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
 192                                 NCI_DISC_MAP_MODE_LISTEN;
 193                         cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
 194                         (*num)++;
 195                 } else if (ndev->supported_rf_interfaces[i] ==
 196                            NCI_RF_INTERFACE_NFC_DEP) {
 197                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
 198                         cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
 199                                 NCI_DISC_MAP_MODE_LISTEN;
 200                         cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
 201                         (*num)++;
 202                 }
 203
 204                 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
 205                         break;
 206         }
 207
 208         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
 209                      (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
 210 }
 211
 212 struct nci_set_config_param {
 213         __u8    id;
 214         size_t  len;
 215         __u8    *val;
 216 };
 217
 218 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
 219 {
 220         struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
 221         struct nci_core_set_config_cmd cmd;
 222
 223         BUG_ON(param->len > NCI_MAX_PARAM_LEN);
 224
 225         cmd.num_params = 1;
 226         cmd.param.id = param->id;
 227         cmd.param.len = param->len;
 228         memcpy(cmd.param.val, param->val, param->len);
 229
 230         nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
 231 }
 232
 233 struct nci_rf_discover_param {
 234         __u32   im_protocols;
 235         __u32   tm_protocols;
 236 };
 237
 238 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
 239 {
 240         struct nci_rf_discover_param *param =
 241                 (struct nci_rf_discover_param *)opt;
 242         struct nci_rf_disc_cmd cmd;
 243
 244         cmd.num_disc_configs = 0;
 245
 246         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 247             (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
 248              param->im_protocols & NFC_PROTO_MIFARE_MASK ||
 249              param->im_protocols & NFC_PROTO_ISO14443_MASK ||
 250              param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
 251                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
 252                         NCI_NFC_A_PASSIVE_POLL_MODE;
 253                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 254                 cmd.num_disc_configs++;
 255         }
 256
 257         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 258             (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
 259                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
 260                         NCI_NFC_B_PASSIVE_POLL_MODE;
 261                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 262                 cmd.num_disc_configs++;
 263         }
 264
 265         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 266             (param->im_protocols & NFC_PROTO_FELICA_MASK ||
 267              param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
 268                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
 269                         NCI_NFC_F_PASSIVE_POLL_MODE;
 270                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 271                 cmd.num_disc_configs++;
 272         }
 273
 274         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
 275             (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
 276                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
 277                         NCI_NFC_V_PASSIVE_POLL_MODE;
 278                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 279                 cmd.num_disc_configs++;
 280         }
 281
 282         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
 283             (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
 284                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
 285                         NCI_NFC_A_PASSIVE_LISTEN_MODE;
 286                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 287                 cmd.num_disc_configs++;
 288                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
 289                         NCI_NFC_F_PASSIVE_LISTEN_MODE;
 290                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
 291                 cmd.num_disc_configs++;
 292         }
 293
 294         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
 295                      (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
 296                      &cmd);
 297 }
 298
 299 struct nci_rf_discover_select_param {
 300         __u8    rf_discovery_id;
 301         __u8    rf_protocol;
 302 };
 303
 304 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
 305 {
 306         struct nci_rf_discover_select_param *param =
 307                 (struct nci_rf_discover_select_param *)opt;
 308         struct nci_rf_discover_select_cmd cmd;
 309
 310         cmd.rf_discovery_id = param->rf_discovery_id;
 311         cmd.rf_protocol = param->rf_protocol;
 312
 313         switch (cmd.rf_protocol) {
 314         case NCI_RF_PROTOCOL_ISO_DEP:
 315                 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
 316                 break;
 317
 318         case NCI_RF_PROTOCOL_NFC_DEP:
 319                 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
 320                 break;
 321
 322         default:
 323                 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
 324                 break;
 325         }
 326
 327         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
 328                      sizeof(struct nci_rf_discover_select_cmd), &cmd);
 329 }
 330
 331 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
 332 {
 333         struct nci_rf_deactivate_cmd cmd;
 334
 335         cmd.type = opt;
 336
 337         nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
 338                      sizeof(struct nci_rf_deactivate_cmd), &cmd);
 339 }
 340
 341 struct nci_cmd_param {
 342         __u16 opcode;
 343         size_t len;
 344         __u8 *payload;
 345 };
 346
 347 static void nci_generic_req(struct nci_dev *ndev, unsigned long opt)
 348 {
 349         struct nci_cmd_param *param =
 350                 (struct nci_cmd_param *)opt;
 351
 352         nci_send_cmd(ndev, param->opcode, param->len, param->payload);
 353 }
 354
 355 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
 356 {
 357         struct nci_cmd_param param;
 358
 359         param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
 360         param.len = len;
 361         param.payload = payload;
 362
 363         return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
 364                              msecs_to_jiffies(NCI_CMD_TIMEOUT));
 365 }
 366 EXPORT_SYMBOL(nci_prop_cmd);
 367
 368 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload)
 369 {
 370         struct nci_cmd_param param;
 371
 372         param.opcode = opcode;
 373         param.len = len;
 374         param.payload = payload;
 375
 376         return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
 377                              msecs_to_jiffies(NCI_CMD_TIMEOUT));
 378 }
 379 EXPORT_SYMBOL(nci_core_cmd);
 380
 381 int nci_core_reset(struct nci_dev *ndev)
 382 {
 383         return __nci_request(ndev, nci_reset_req, 0,
 384                              msecs_to_jiffies(NCI_RESET_TIMEOUT));
 385 }
 386 EXPORT_SYMBOL(nci_core_reset);
 387
 388 int nci_core_init(struct nci_dev *ndev)
 389 {
 390         return __nci_request(ndev, nci_init_req, 0,
 391                              msecs_to_jiffies(NCI_INIT_TIMEOUT));
 392 }
 393 EXPORT_SYMBOL(nci_core_init);
 394
 395 struct nci_loopback_data {
 396         u8 conn_id;
 397         struct sk_buff *data;
 398 };
 399
 400 static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt)
 401 {
 402         struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
 403
 404         nci_send_data(ndev, data->conn_id, data->data);
 405 }
 406
 407 static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
 408 {
 409         struct nci_dev *ndev = (struct nci_dev *)context;
 410         struct nci_conn_info    *conn_info;
 411
 412         conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
 413         if (!conn_info) {
 414                 nci_req_complete(ndev, NCI_STATUS_REJECTED);
 415                 return;
 416         }
 417
 418         conn_info->rx_skb = skb;
 419
 420         nci_req_complete(ndev, NCI_STATUS_OK);
 421 }
 422
 423 int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
 424                       struct sk_buff **resp)
 425 {
 426         int r;
 427         struct nci_loopback_data loopback_data;
 428         struct nci_conn_info *conn_info;
 429         struct sk_buff *skb;
 430         int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
 431                                         NCI_DESTINATION_NFCC_LOOPBACK, NULL);
 432
 433         if (conn_id < 0) {
 434                 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
 435                                          0, 0, NULL);
 436                 if (r != NCI_STATUS_OK)
 437                         return r;
 438
 439                 conn_id = nci_get_conn_info_by_dest_type_params(ndev,
 440                                         NCI_DESTINATION_NFCC_LOOPBACK,
 441                                         NULL);
 442         }
 443
 444         conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
 445         if (!conn_info)
 446                 return -EPROTO;
 447
 448         /* store cb and context to be used on receiving data */
 449         conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
 450         conn_info->data_exchange_cb_context = ndev;
 451
 452         skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
 453         if (!skb)
 454                 return -ENOMEM;
 455
 456         skb_reserve(skb, NCI_DATA_HDR_SIZE);
 457         skb_put_data(skb, data, data_len);
 458
 459         loopback_data.conn_id = conn_id;
 460         loopback_data.data = skb;
 461
 462         ndev->cur_conn_id = conn_id;
 463         r = nci_request(ndev, nci_send_data_req, (unsigned long)&loopback_data,
 464                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 465         if (r == NCI_STATUS_OK && resp)
 466                 *resp = conn_info->rx_skb;
 467
 468         return r;
 469 }
 470 EXPORT_SYMBOL(nci_nfcc_loopback);
 471
 472 static int nci_open_device(struct nci_dev *ndev)
 473 {
 474         int rc = 0;
 475
 476         mutex_lock(&ndev->req_lock);
 477
 478         if (test_bit(NCI_UP, &ndev->flags)) {
 479                 rc = -EALREADY;
 480                 goto done;
 481         }
 482
 483         if (ndev->ops->open(ndev)) {
 484                 rc = -EIO;
 485                 goto done;
 486         }
 487
 488         atomic_set(&ndev->cmd_cnt, 1);
 489
 490         set_bit(NCI_INIT, &ndev->flags);
 491
 492         if (ndev->ops->init)
 493                 rc = ndev->ops->init(ndev);
 494
 495         if (!rc) {
 496                 rc = __nci_request(ndev, nci_reset_req, 0,
 497                                    msecs_to_jiffies(NCI_RESET_TIMEOUT));
 498         }
 499
 500         if (!rc && ndev->ops->setup) {
 501                 rc = ndev->ops->setup(ndev);
 502         }
 503
 504         if (!rc) {
 505                 struct nci_core_init_v2_cmd nci_init_v2_cmd = {
 506                         .feature1 = NCI_FEATURE_DISABLE,
 507                         .feature2 = NCI_FEATURE_DISABLE
 508                 };
 509                 unsigned long opt = 0;
 510
 511                 if (!(ndev->nci_ver & NCI_VER_2_MASK))
 512                         opt = (unsigned long)&nci_init_v2_cmd;
 513
 514                 rc = __nci_request(ndev, nci_init_req, opt,
 515                                    msecs_to_jiffies(NCI_INIT_TIMEOUT));
 516         }
 517
 518         if (!rc && ndev->ops->post_setup)
 519                 rc = ndev->ops->post_setup(ndev);
 520
 521         if (!rc) {
 522                 rc = __nci_request(ndev, nci_init_complete_req, 0,
 523                                    msecs_to_jiffies(NCI_INIT_TIMEOUT));
 524         }
 525
 526         clear_bit(NCI_INIT, &ndev->flags);
 527
 528         if (!rc) {
 529                 set_bit(NCI_UP, &ndev->flags);
 530                 nci_clear_target_list(ndev);
 531                 atomic_set(&ndev->state, NCI_IDLE);
 532         } else {
 533                 /* Init failed, cleanup */
 534                 skb_queue_purge(&ndev->cmd_q);
 535                 skb_queue_purge(&ndev->rx_q);
 536                 skb_queue_purge(&ndev->tx_q);
 537
 538                 ndev->ops->close(ndev);
 539                 ndev->flags = 0;
 540         }
 541
 542 done:
 543         mutex_unlock(&ndev->req_lock);
 544         return rc;
 545 }
 546
 547 static int nci_close_device(struct nci_dev *ndev)
 548 {
 549         nci_req_cancel(ndev, ENODEV);
 550         mutex_lock(&ndev->req_lock);
 551
 552         if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
 553                 del_timer_sync(&ndev->cmd_timer);
 554                 del_timer_sync(&ndev->data_timer);
 555                 mutex_unlock(&ndev->req_lock);
 556                 return 0;
 557         }
 558
 559         /* Drop RX and TX queues */
 560         skb_queue_purge(&ndev->rx_q);
 561         skb_queue_purge(&ndev->tx_q);
 562
 563         /* Flush RX and TX wq */
 564         flush_workqueue(ndev->rx_wq);
 565         flush_workqueue(ndev->tx_wq);
 566
 567         /* Reset device */
 568         skb_queue_purge(&ndev->cmd_q);
 569         atomic_set(&ndev->cmd_cnt, 1);
 570
 571         set_bit(NCI_INIT, &ndev->flags);
 572         __nci_request(ndev, nci_reset_req, 0,
 573                       msecs_to_jiffies(NCI_RESET_TIMEOUT));
 574
 575         /* After this point our queues are empty
 576          * and no works are scheduled.
 577          */
 578         ndev->ops->close(ndev);
 579
 580         clear_bit(NCI_INIT, &ndev->flags);
 581
 582         del_timer_sync(&ndev->cmd_timer);
 583
 584         /* Flush cmd wq */
 585         flush_workqueue(ndev->cmd_wq);
 586
 587         /* Clear flags */
 588         ndev->flags = 0;
 589
 590         mutex_unlock(&ndev->req_lock);
 591
 592         return 0;
 593 }
 594
 595 /* NCI command timer function */
 596 static void nci_cmd_timer(struct timer_list *t)
 597 {
 598         struct nci_dev *ndev = from_timer(ndev, t, cmd_timer);
 599
 600         atomic_set(&ndev->cmd_cnt, 1);
 601         queue_work(ndev->cmd_wq, &ndev->cmd_work);
 602 }
 603
 604 /* NCI data exchange timer function */
 605 static void nci_data_timer(struct timer_list *t)
 606 {
 607         struct nci_dev *ndev = from_timer(ndev, t, data_timer);
 608
 609         set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
 610         queue_work(ndev->rx_wq, &ndev->rx_work);
 611 }
 612
 613 static int nci_dev_up(struct nfc_dev *nfc_dev)
 614 {
 615         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 616
 617         return nci_open_device(ndev);
 618 }
 619
 620 static int nci_dev_down(struct nfc_dev *nfc_dev)
 621 {
 622         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 623
 624         return nci_close_device(ndev);
 625 }
 626
 627 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
 628 {
 629         struct nci_set_config_param param;
 630
 631         if (!val || !len)
 632                 return 0;
 633
 634         param.id = id;
 635         param.len = len;
 636         param.val = val;
 637
 638         return __nci_request(ndev, nci_set_config_req, (unsigned long)&param,
 639                              msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
 640 }
 641 EXPORT_SYMBOL(nci_set_config);
 642
 643 static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
 644 {
 645         struct nci_nfcee_discover_cmd cmd;
 646         __u8 action = opt;
 647
 648         cmd.discovery_action = action;
 649
 650         nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd);
 651 }
 652
 653 int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
 654 {
 655         return __nci_request(ndev, nci_nfcee_discover_req, action,
 656                                 msecs_to_jiffies(NCI_CMD_TIMEOUT));
 657 }
 658 EXPORT_SYMBOL(nci_nfcee_discover);
 659
 660 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt)
 661 {
 662         struct nci_nfcee_mode_set_cmd *cmd =
 663                                         (struct nci_nfcee_mode_set_cmd *)opt;
 664
 665         nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
 666                      sizeof(struct nci_nfcee_mode_set_cmd), cmd);
 667 }
 668
 669 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
 670 {
 671         struct nci_nfcee_mode_set_cmd cmd;
 672
 673         cmd.nfcee_id = nfcee_id;
 674         cmd.nfcee_mode = nfcee_mode;
 675
 676         return __nci_request(ndev, nci_nfcee_mode_set_req,
 677                              (unsigned long)&cmd,
 678                              msecs_to_jiffies(NCI_CMD_TIMEOUT));
 679 }
 680 EXPORT_SYMBOL(nci_nfcee_mode_set);
 681
 682 static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
 683 {
 684         struct core_conn_create_data *data =
 685                                         (struct core_conn_create_data *)opt;
 686
 687         nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
 688 }
 689
 690 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
 691                          u8 number_destination_params,
 692                          size_t params_len,
 693                          struct core_conn_create_dest_spec_params *params)
 694 {
 695         int r;
 696         struct nci_core_conn_create_cmd *cmd;
 697         struct core_conn_create_data data;
 698
 699         data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
 700         cmd = kzalloc(data.length, GFP_KERNEL);
 701         if (!cmd)
 702                 return -ENOMEM;
 703
 704         cmd->destination_type = destination_type;
 705         cmd->number_destination_params = number_destination_params;
 706
 707         data.cmd = cmd;
 708
 709         if (params) {
 710                 memcpy(cmd->params, params, params_len);
 711                 if (params->length > 0)
 712                         memcpy(&ndev->cur_params,
 713                                &params->value[DEST_SPEC_PARAMS_ID_INDEX],
 714                                sizeof(struct dest_spec_params));
 715                 else
 716                         ndev->cur_params.id = 0;
 717         } else {
 718                 ndev->cur_params.id = 0;
 719         }
 720         ndev->cur_dest_type = destination_type;
 721
 722         r = __nci_request(ndev, nci_core_conn_create_req, (unsigned long)&data,
 723                           msecs_to_jiffies(NCI_CMD_TIMEOUT));
 724         kfree(cmd);
 725         return r;
 726 }
 727 EXPORT_SYMBOL(nci_core_conn_create);
 728
 729 static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
 730 {
 731         __u8 conn_id = opt;
 732
 733         nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
 734 }
 735
 736 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
 737 {
 738         ndev->cur_conn_id = conn_id;
 739         return __nci_request(ndev, nci_core_conn_close_req, conn_id,
 740                              msecs_to_jiffies(NCI_CMD_TIMEOUT));
 741 }
 742 EXPORT_SYMBOL(nci_core_conn_close);
 743
 744 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
 745 {
 746         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 747         struct nci_set_config_param param;
 748         int rc;
 749
 750         param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
 751         if ((param.val == NULL) || (param.len == 0))
 752                 return 0;
 753
 754         if (param.len > NFC_MAX_GT_LEN)
 755                 return -EINVAL;
 756
 757         param.id = NCI_PN_ATR_REQ_GEN_BYTES;
 758
 759         rc = nci_request(ndev, nci_set_config_req, (unsigned long)&param,
 760                          msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
 761         if (rc)
 762                 return rc;
 763
 764         param.id = NCI_LN_ATR_RES_GEN_BYTES;
 765
 766         return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
 767                            msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
 768 }
 769
 770 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
 771 {
 772         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 773         int rc;
 774         __u8 val;
 775
 776         val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
 777
 778         rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
 779         if (rc)
 780                 return rc;
 781
 782         val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
 783
 784         rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
 785         if (rc)
 786                 return rc;
 787
 788         val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
 789
 790         return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
 791 }
 792
 793 static int nci_start_poll(struct nfc_dev *nfc_dev,
 794                           __u32 im_protocols, __u32 tm_protocols)
 795 {
 796         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 797         struct nci_rf_discover_param param;
 798         int rc;
 799
 800         if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
 801             (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
 802                 pr_err("unable to start poll, since poll is already active\n");
 803                 return -EBUSY;
 804         }
 805
 806         if (ndev->target_active_prot) {
 807                 pr_err("there is an active target\n");
 808                 return -EBUSY;
 809         }
 810
 811         if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
 812             (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
 813                 pr_debug("target active or w4 select, implicitly deactivate\n");
 814
 815                 rc = nci_request(ndev, nci_rf_deactivate_req,
 816                                  NCI_DEACTIVATE_TYPE_IDLE_MODE,
 817                                  msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 818                 if (rc)
 819                         return -EBUSY;
 820         }
 821
 822         if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
 823                 rc = nci_set_local_general_bytes(nfc_dev);
 824                 if (rc) {
 825                         pr_err("failed to set local general bytes\n");
 826                         return rc;
 827                 }
 828         }
 829
 830         if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
 831                 rc = nci_set_listen_parameters(nfc_dev);
 832                 if (rc)
 833                         pr_err("failed to set listen parameters\n");
 834         }
 835
 836         param.im_protocols = im_protocols;
 837         param.tm_protocols = tm_protocols;
 838         rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)&param,
 839                          msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
 840
 841         if (!rc)
 842                 ndev->poll_prots = im_protocols;
 843
 844         return rc;
 845 }
 846
 847 static void nci_stop_poll(struct nfc_dev *nfc_dev)
 848 {
 849         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 850
 851         if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
 852             (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
 853                 pr_err("unable to stop poll, since poll is not active\n");
 854                 return;
 855         }
 856
 857         nci_request(ndev, nci_rf_deactivate_req, NCI_DEACTIVATE_TYPE_IDLE_MODE,
 858                     msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 859 }
 860
 861 static int nci_activate_target(struct nfc_dev *nfc_dev,
 862                                struct nfc_target *target, __u32 protocol)
 863 {
 864         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 865         struct nci_rf_discover_select_param param;
 866         struct nfc_target *nci_target = NULL;
 867         int i;
 868         int rc = 0;
 869
 870         pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
 871
 872         if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
 873             (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
 874                 pr_err("there is no available target to activate\n");
 875                 return -EINVAL;
 876         }
 877
 878         if (ndev->target_active_prot) {
 879                 pr_err("there is already an active target\n");
 880                 return -EBUSY;
 881         }
 882
 883         for (i = 0; i < ndev->n_targets; i++) {
 884                 if (ndev->targets[i].idx == target->idx) {
 885                         nci_target = &ndev->targets[i];
 886                         break;
 887                 }
 888         }
 889
 890         if (!nci_target) {
 891                 pr_err("unable to find the selected target\n");
 892                 return -EINVAL;
 893         }
 894
 895         if (!(nci_target->supported_protocols & (1 << protocol))) {
 896                 pr_err("target does not support the requested protocol 0x%x\n",
 897                        protocol);
 898                 return -EINVAL;
 899         }
 900
 901         if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
 902                 param.rf_discovery_id = nci_target->logical_idx;
 903
 904                 if (protocol == NFC_PROTO_JEWEL)
 905                         param.rf_protocol = NCI_RF_PROTOCOL_T1T;
 906                 else if (protocol == NFC_PROTO_MIFARE)
 907                         param.rf_protocol = NCI_RF_PROTOCOL_T2T;
 908                 else if (protocol == NFC_PROTO_FELICA)
 909                         param.rf_protocol = NCI_RF_PROTOCOL_T3T;
 910                 else if (protocol == NFC_PROTO_ISO14443 ||
 911                          protocol == NFC_PROTO_ISO14443_B)
 912                         param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
 913                 else
 914                         param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
 915
 916                 rc = nci_request(ndev, nci_rf_discover_select_req,
 917                                  (unsigned long)&param,
 918                                  msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
 919         }
 920
 921         if (!rc)
 922                 ndev->target_active_prot = protocol;
 923
 924         return rc;
 925 }
 926
 927 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
 928                                   struct nfc_target *target,
 929                                   __u8 mode)
 930 {
 931         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 932         u8 nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
 933
 934         pr_debug("entry\n");
 935
 936         if (!ndev->target_active_prot) {
 937                 pr_err("unable to deactivate target, no active target\n");
 938                 return;
 939         }
 940
 941         ndev->target_active_prot = 0;
 942
 943         switch (mode) {
 944         case NFC_TARGET_MODE_SLEEP:
 945                 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
 946                 break;
 947         }
 948
 949         if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
 950                 nci_request(ndev, nci_rf_deactivate_req, nci_mode,
 951                             msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 952         }
 953 }
 954
 955 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
 956                            __u8 comm_mode, __u8 *gb, size_t gb_len)
 957 {
 958         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 959         int rc;
 960
 961         pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
 962
 963         rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
 964         if (rc)
 965                 return rc;
 966
 967         rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
 968                                           ndev->remote_gb_len);
 969         if (!rc)
 970                 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
 971                                         NFC_RF_INITIATOR);
 972
 973         return rc;
 974 }
 975
 976 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
 977 {
 978         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 979         int rc;
 980
 981         pr_debug("entry\n");
 982
 983         if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
 984                 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE);
 985         } else {
 986                 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
 987                     atomic_read(&ndev->state) == NCI_DISCOVERY) {
 988                         nci_request(ndev, nci_rf_deactivate_req, 0,
 989                                 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 990                 }
 991
 992                 rc = nfc_tm_deactivated(nfc_dev);
 993                 if (rc)
 994                         pr_err("error when signaling tm deactivation\n");
 995         }
 996
 997         return 0;
 998 }
 999
1000
1001 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
1002                           struct sk_buff *skb,
1003                           data_exchange_cb_t cb, void *cb_context)
1004 {
1005         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1006         int rc;
1007         struct nci_conn_info    *conn_info;
1008
1009         conn_info = ndev->rf_conn_info;
1010         if (!conn_info)
1011                 return -EPROTO;
1012
1013         pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
1014
1015         if (!ndev->target_active_prot) {
1016                 pr_err("unable to exchange data, no active target\n");
1017                 return -EINVAL;
1018         }
1019
1020         if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1021                 return -EBUSY;
1022
1023         /* store cb and context to be used on receiving data */
1024         conn_info->data_exchange_cb = cb;
1025         conn_info->data_exchange_cb_context = cb_context;
1026
1027         rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1028         if (rc)
1029                 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
1030
1031         return rc;
1032 }
1033
1034 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
1035 {
1036         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1037         int rc;
1038
1039         rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1040         if (rc)
1041                 pr_err("unable to send data\n");
1042
1043         return rc;
1044 }
1045
1046 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1047 {
1048         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1049
1050         if (ndev->ops->enable_se)
1051                 return ndev->ops->enable_se(ndev, se_idx);
1052
1053         return 0;
1054 }
1055
1056 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1057 {
1058         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1059
1060         if (ndev->ops->disable_se)
1061                 return ndev->ops->disable_se(ndev, se_idx);
1062
1063         return 0;
1064 }
1065
1066 static int nci_discover_se(struct nfc_dev *nfc_dev)
1067 {
1068         int r;
1069         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1070
1071         if (ndev->ops->discover_se) {
1072                 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
1073                 if (r != NCI_STATUS_OK)
1074                         return -EPROTO;
1075
1076                 return ndev->ops->discover_se(ndev);
1077         }
1078
1079         return 0;
1080 }
1081
1082 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
1083                      u8 *apdu, size_t apdu_length,
1084                      se_io_cb_t cb, void *cb_context)
1085 {
1086         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1087
1088         if (ndev->ops->se_io)
1089                 return ndev->ops->se_io(ndev, se_idx, apdu,
1090                                 apdu_length, cb, cb_context);
1091
1092         return 0;
1093 }
1094
1095 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
1096 {
1097         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1098
1099         if (!ndev->ops->fw_download)
1100                 return -ENOTSUPP;
1101
1102         return ndev->ops->fw_download(ndev, firmware_name);
1103 }
1104
1105 static struct nfc_ops nci_nfc_ops = {
1106         .dev_up = nci_dev_up,
1107         .dev_down = nci_dev_down,
1108         .start_poll = nci_start_poll,
1109         .stop_poll = nci_stop_poll,
1110         .dep_link_up = nci_dep_link_up,
1111         .dep_link_down = nci_dep_link_down,
1112         .activate_target = nci_activate_target,
1113         .deactivate_target = nci_deactivate_target,
1114         .im_transceive = nci_transceive,
1115         .tm_send = nci_tm_send,
1116         .enable_se = nci_enable_se,
1117         .disable_se = nci_disable_se,
1118         .discover_se = nci_discover_se,
1119         .se_io = nci_se_io,
1120         .fw_download = nci_fw_download,
1121 };
1122
1123 /* ---- Interface to NCI drivers ---- */
1124 /**
1125  * nci_allocate_device - allocate a new nci device
1126  *
1127  * @ops: device operations
1128  * @supported_protocols: NFC protocols supported by the device
1129  * @tx_headroom: Reserved space at beginning of skb
1130  * @tx_tailroom: Reserved space at end of skb
1131  */
1132 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
1133                                     __u32 supported_protocols,
1134                                     int tx_headroom, int tx_tailroom)
1135 {
1136         struct nci_dev *ndev;
1137
1138         pr_debug("supported_protocols 0x%x\n", supported_protocols);
1139
1140         if (!ops->open || !ops->close || !ops->send)
1141                 return NULL;
1142
1143         if (!supported_protocols)
1144                 return NULL;
1145
1146         ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
1147         if (!ndev)
1148                 return NULL;
1149
1150         ndev->ops = ops;
1151
1152         if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
1153                 pr_err("Too many proprietary commands: %zd\n",
1154                        ops->n_prop_ops);
1155                 ops->prop_ops = NULL;
1156                 ops->n_prop_ops = 0;
1157         }
1158
1159         ndev->tx_headroom = tx_headroom;
1160         ndev->tx_tailroom = tx_tailroom;
1161         init_completion(&ndev->req_completion);
1162
1163         ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
1164                                             supported_protocols,
1165                                             tx_headroom + NCI_DATA_HDR_SIZE,
1166                                             tx_tailroom);
1167         if (!ndev->nfc_dev)
1168                 goto free_nci;
1169
1170         ndev->hci_dev = nci_hci_allocate(ndev);
1171         if (!ndev->hci_dev)
1172                 goto free_nfc;
1173
1174         nfc_set_drvdata(ndev->nfc_dev, ndev);
1175
1176         return ndev;
1177
1178 free_nfc:
1179         nfc_free_device(ndev->nfc_dev);
1180 free_nci:
1181         kfree(ndev);
1182         return NULL;
1183 }
1184 EXPORT_SYMBOL(nci_allocate_device);
1185
1186 /**
1187  * nci_free_device - deallocate nci device
1188  *
1189  * @ndev: The nci device to deallocate
1190  */
1191 void nci_free_device(struct nci_dev *ndev)
1192 {
1193         nfc_free_device(ndev->nfc_dev);
1194         kfree(ndev);
1195 }
1196 EXPORT_SYMBOL(nci_free_device);
1197
1198 /**
1199  * nci_register_device - register a nci device in the nfc subsystem
1200  *
1201  * @ndev: The nci device to register
1202  */
1203 int nci_register_device(struct nci_dev *ndev)
1204 {
1205         int rc;
1206         struct device *dev = &ndev->nfc_dev->dev;
1207         char name[32];
1208
1209         ndev->flags = 0;
1210
1211         INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1212         snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
1213         ndev->cmd_wq = create_singlethread_workqueue(name);
1214         if (!ndev->cmd_wq) {
1215                 rc = -ENOMEM;
1216                 goto exit;
1217         }
1218
1219         INIT_WORK(&ndev->rx_work, nci_rx_work);
1220         snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
1221         ndev->rx_wq = create_singlethread_workqueue(name);
1222         if (!ndev->rx_wq) {
1223                 rc = -ENOMEM;
1224                 goto destroy_cmd_wq_exit;
1225         }
1226
1227         INIT_WORK(&ndev->tx_work, nci_tx_work);
1228         snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
1229         ndev->tx_wq = create_singlethread_workqueue(name);
1230         if (!ndev->tx_wq) {
1231                 rc = -ENOMEM;
1232                 goto destroy_rx_wq_exit;
1233         }
1234
1235         skb_queue_head_init(&ndev->cmd_q);
1236         skb_queue_head_init(&ndev->rx_q);
1237         skb_queue_head_init(&ndev->tx_q);
1238
1239         timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0);
1240         timer_setup(&ndev->data_timer, nci_data_timer, 0);
1241
1242         mutex_init(&ndev->req_lock);
1243         INIT_LIST_HEAD(&ndev->conn_info_list);
1244
1245         rc = nfc_register_device(ndev->nfc_dev);
1246         if (rc)
1247                 goto destroy_tx_wq_exit;
1248
1249         goto exit;
1250
1251 destroy_tx_wq_exit:
1252         destroy_workqueue(ndev->tx_wq);
1253
1254 destroy_rx_wq_exit:
1255         destroy_workqueue(ndev->rx_wq);
1256
1257 destroy_cmd_wq_exit:
1258         destroy_workqueue(ndev->cmd_wq);
1259
1260 exit:
1261         return rc;
1262 }
1263 EXPORT_SYMBOL(nci_register_device);
1264
1265 /**
1266  * nci_unregister_device - unregister a nci device in the nfc subsystem
1267  *
1268  * @ndev: The nci device to unregister
1269  */
1270 void nci_unregister_device(struct nci_dev *ndev)
1271 {
1272         struct nci_conn_info    *conn_info, *n;
1273
1274         nci_close_device(ndev);
1275
1276         destroy_workqueue(ndev->cmd_wq);
1277         destroy_workqueue(ndev->rx_wq);
1278         destroy_workqueue(ndev->tx_wq);
1279
1280         list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1281                 list_del(&conn_info->list);
1282                 /* conn_info is allocated with devm_kzalloc */
1283         }
1284
1285         nfc_unregister_device(ndev->nfc_dev);
1286 }
1287 EXPORT_SYMBOL(nci_unregister_device);
1288
1289 /**
1290  * nci_recv_frame - receive frame from NCI drivers
1291  *
1292  * @ndev: The nci device
1293  * @skb: The sk_buff to receive
1294  */
1295 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1296 {
1297         pr_debug("len %d\n", skb->len);
1298
1299         if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1300             !test_bit(NCI_INIT, &ndev->flags))) {
1301                 kfree_skb(skb);
1302                 return -ENXIO;
1303         }
1304
1305         /* Queue frame for rx worker thread */
1306         skb_queue_tail(&ndev->rx_q, skb);
1307         queue_work(ndev->rx_wq, &ndev->rx_work);
1308
1309         return 0;
1310 }
1311 EXPORT_SYMBOL(nci_recv_frame);
1312
1313 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1314 {
1315         pr_debug("len %d\n", skb->len);
1316
1317         if (!ndev) {
1318                 kfree_skb(skb);
1319                 return -ENODEV;
1320         }
1321
1322         /* Get rid of skb owner, prior to sending to the driver. */
1323         skb_orphan(skb);
1324
1325         /* Send copy to sniffer */
1326         nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1327                              RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1328
1329         return ndev->ops->send(ndev, skb);
1330 }
1331 EXPORT_SYMBOL(nci_send_frame);
1332
1333 /* Send NCI command */
1334 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
1335 {
1336         struct nci_ctrl_hdr *hdr;
1337         struct sk_buff *skb;
1338
1339         pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1340
1341         skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1342         if (!skb) {
1343                 pr_err("no memory for command\n");
1344                 return -ENOMEM;
1345         }
1346
1347         hdr = skb_put(skb, NCI_CTRL_HDR_SIZE);
1348         hdr->gid = nci_opcode_gid(opcode);
1349         hdr->oid = nci_opcode_oid(opcode);
1350         hdr->plen = plen;
1351
1352         nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1353         nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1354
1355         if (plen)
1356                 skb_put_data(skb, payload, plen);
1357
1358         skb_queue_tail(&ndev->cmd_q, skb);
1359         queue_work(ndev->cmd_wq, &ndev->cmd_work);
1360
1361         return 0;
1362 }
1363 EXPORT_SYMBOL(nci_send_cmd);
1364
1365 /* Proprietary commands API */
1366 static struct nci_driver_ops *ops_cmd_lookup(struct nci_driver_ops *ops,
1367                                              size_t n_ops,
1368                                              __u16 opcode)
1369 {
1370         size_t i;
1371         struct nci_driver_ops *op;
1372
1373         if (!ops || !n_ops)
1374                 return NULL;
1375
1376         for (i = 0; i < n_ops; i++) {
1377                 op = &ops[i];
1378                 if (op->opcode == opcode)
1379                         return op;
1380         }
1381
1382         return NULL;
1383 }
1384
1385 static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
1386                              struct sk_buff *skb, struct nci_driver_ops *ops,
1387                              size_t n_ops)
1388 {
1389         struct nci_driver_ops *op;
1390
1391         op = ops_cmd_lookup(ops, n_ops, rsp_opcode);
1392         if (!op || !op->rsp)
1393                 return -ENOTSUPP;
1394
1395         return op->rsp(ndev, skb);
1396 }
1397
1398 static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
1399                              struct sk_buff *skb, struct nci_driver_ops *ops,
1400                              size_t n_ops)
1401 {
1402         struct nci_driver_ops *op;
1403
1404         op = ops_cmd_lookup(ops, n_ops, ntf_opcode);
1405         if (!op || !op->ntf)
1406                 return -ENOTSUPP;
1407
1408         return op->ntf(ndev, skb);
1409 }
1410
1411 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1412                         struct sk_buff *skb)
1413 {
1414         return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1415                                  ndev->ops->n_prop_ops);
1416 }
1417
1418 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1419                         struct sk_buff *skb)
1420 {
1421         return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1422                                  ndev->ops->n_prop_ops);
1423 }
1424
1425 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1426                         struct sk_buff *skb)
1427 {
1428         return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops,
1429                                   ndev->ops->n_core_ops);
1430 }
1431
1432 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1433                         struct sk_buff *skb)
1434 {
1435         return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops,
1436                                  ndev->ops->n_core_ops);
1437 }
1438
1439 /* ---- NCI TX Data worker thread ---- */
1440
1441 static void nci_tx_work(struct work_struct *work)
1442 {
1443         struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1444         struct nci_conn_info    *conn_info;
1445         struct sk_buff *skb;
1446
1447         conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
1448         if (!conn_info)
1449                 return;
1450
1451         pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1452
1453         /* Send queued tx data */
1454         while (atomic_read(&conn_info->credits_cnt)) {
1455                 skb = skb_dequeue(&ndev->tx_q);
1456                 if (!skb)
1457                         return;
1458
1459                 /* Check if data flow control is used */
1460                 if (atomic_read(&conn_info->credits_cnt) !=
1461                     NCI_DATA_FLOW_CONTROL_NOT_USED)
1462                         atomic_dec(&conn_info->credits_cnt);
1463
1464                 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1465                          nci_pbf(skb->data),
1466                          nci_conn_id(skb->data),
1467                          nci_plen(skb->data));
1468
1469                 nci_send_frame(ndev, skb);
1470
1471                 mod_timer(&ndev->data_timer,
1472                           jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1473         }
1474 }
1475
1476 /* ----- NCI RX worker thread (data & control) ----- */
1477
1478 static void nci_rx_work(struct work_struct *work)
1479 {
1480         struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1481         struct sk_buff *skb;
1482
1483         while ((skb = skb_dequeue(&ndev->rx_q))) {
1484
1485                 /* Send copy to sniffer */
1486                 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1487                                      RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1488
1489                 /* Process frame */
1490                 switch (nci_mt(skb->data)) {
1491                 case NCI_MT_RSP_PKT:
1492                         nci_rsp_packet(ndev, skb);
1493                         break;
1494
1495                 case NCI_MT_NTF_PKT:
1496                         nci_ntf_packet(ndev, skb);
1497                         break;
1498
1499                 case NCI_MT_DATA_PKT:
1500                         nci_rx_data_packet(ndev, skb);
1501                         break;
1502
1503                 default:
1504                         pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1505                         kfree_skb(skb);
1506                         break;
1507                 }
1508         }
1509
1510         /* check if a data exchange timout has occurred */
1511         if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1512                 /* complete the data exchange transaction, if exists */
1513                 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1514                         nci_data_exchange_complete(ndev, NULL,
1515                                                    ndev->cur_conn_id,
1516                                                    -ETIMEDOUT);
1517
1518                 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1519         }
1520 }
1521
1522 /* ----- NCI TX CMD worker thread ----- */
1523
1524 static void nci_cmd_work(struct work_struct *work)
1525 {
1526         struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1527         struct sk_buff *skb;
1528
1529         pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1530
1531         /* Send queued command */
1532         if (atomic_read(&ndev->cmd_cnt)) {
1533                 skb = skb_dequeue(&ndev->cmd_q);
1534                 if (!skb)
1535                         return;
1536
1537                 atomic_dec(&ndev->cmd_cnt);
1538
1539                 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1540                          nci_pbf(skb->data),
1541                          nci_opcode_gid(nci_opcode(skb->data)),
1542                          nci_opcode_oid(nci_opcode(skb->data)),
1543                          nci_plen(skb->data));
1544
1545                 nci_send_frame(ndev, skb);
1546
1547                 mod_timer(&ndev->cmd_timer,
1548                           jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1549         }
1550 }
1551
1552 MODULE_LICENSE("GPL");