linux/net/nfc/nci/core.c
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   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
  33struct core_conn_create_data {
  34        int length;
  35        struct nci_core_conn_create_cmd *cmd;
  36};
  37
  38static void nci_cmd_work(struct work_struct *work);
  39static void nci_rx_work(struct work_struct *work);
  40static void nci_tx_work(struct work_struct *work);
  41
  42struct 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
  55int 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}
  73EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
  74
  75/* ---- NCI requests ---- */
  76
  77void 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}
  85EXPORT_SYMBOL(nci_req_complete);
  86
  87static 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. */
  97static 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
 140inline 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
 158static 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
 166static 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
 176static 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
 212struct nci_set_config_param {
 213        __u8    id;
 214        size_t  len;
 215        __u8    *val;
 216};
 217
 218static 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
 233struct nci_rf_discover_param {
 234        __u32   im_protocols;
 235        __u32   tm_protocols;
 236};
 237
 238static 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
 299struct nci_rf_discover_select_param {
 300        __u8    rf_discovery_id;
 301        __u8    rf_protocol;
 302};
 303
 304static 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
 331static 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
 341struct nci_cmd_param {
 342        __u16 opcode;
 343        size_t len;
 344        __u8 *payload;
 345};
 346
 347static 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
 355int 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}
 366EXPORT_SYMBOL(nci_prop_cmd);
 367
 368int 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}
 379EXPORT_SYMBOL(nci_core_cmd);
 380
 381int 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}
 386EXPORT_SYMBOL(nci_core_reset);
 387
 388int 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}
 393EXPORT_SYMBOL(nci_core_init);
 394
 395struct nci_loopback_data {
 396        u8 conn_id;
 397        struct sk_buff *data;
 398};
 399
 400static 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
 407static 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
 423int 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}
 470EXPORT_SYMBOL(nci_nfcc_loopback);
 471
 472static 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
 542done:
 543        mutex_unlock(&ndev->req_lock);
 544        return rc;
 545}
 546
 547static 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        /* Flush cmd wq */
 583        flush_workqueue(ndev->cmd_wq);
 584
 585        del_timer_sync(&ndev->cmd_timer);
 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 */
 596static 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 */
 605static 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
 613static 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
 620static 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
 627int 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}
 641EXPORT_SYMBOL(nci_set_config);
 642
 643static 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
 653int 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}
 658EXPORT_SYMBOL(nci_nfcee_discover);
 659
 660static 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
 669int 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}
 680EXPORT_SYMBOL(nci_nfcee_mode_set);
 681
 682static 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
 690int 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}
 727EXPORT_SYMBOL(nci_core_conn_create);
 728
 729static 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
 736int 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}
 742EXPORT_SYMBOL(nci_core_conn_close);
 743
 744static 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
 770static 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
 793static 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
 847static 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
 861static 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
 927static 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
 955static 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
 976static 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
1001static 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
1034static 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
1046static 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
1056static 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
1066static 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
1082static 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
1095static 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
1105static 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 */
1132struct 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
1178free_nfc:
1179        nfc_free_device(ndev->nfc_dev);
1180free_nci:
1181        kfree(ndev);
1182        return NULL;
1183}
1184EXPORT_SYMBOL(nci_allocate_device);
1185
1186/**
1187 * nci_free_device - deallocate nci device
1188 *
1189 * @ndev: The nci device to deallocate
1190 */
1191void nci_free_device(struct nci_dev *ndev)
1192{
1193        nfc_free_device(ndev->nfc_dev);
1194        nci_hci_deallocate(ndev);
1195        kfree(ndev);
1196}
1197EXPORT_SYMBOL(nci_free_device);
1198
1199/**
1200 * nci_register_device - register a nci device in the nfc subsystem
1201 *
1202 * @ndev: The nci device to register
1203 */
1204int nci_register_device(struct nci_dev *ndev)
1205{
1206        int rc;
1207        struct device *dev = &ndev->nfc_dev->dev;
1208        char name[32];
1209
1210        ndev->flags = 0;
1211
1212        INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1213        snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
1214        ndev->cmd_wq = create_singlethread_workqueue(name);
1215        if (!ndev->cmd_wq) {
1216                rc = -ENOMEM;
1217                goto exit;
1218        }
1219
1220        INIT_WORK(&ndev->rx_work, nci_rx_work);
1221        snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
1222        ndev->rx_wq = create_singlethread_workqueue(name);
1223        if (!ndev->rx_wq) {
1224                rc = -ENOMEM;
1225                goto destroy_cmd_wq_exit;
1226        }
1227
1228        INIT_WORK(&ndev->tx_work, nci_tx_work);
1229        snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
1230        ndev->tx_wq = create_singlethread_workqueue(name);
1231        if (!ndev->tx_wq) {
1232                rc = -ENOMEM;
1233                goto destroy_rx_wq_exit;
1234        }
1235
1236        skb_queue_head_init(&ndev->cmd_q);
1237        skb_queue_head_init(&ndev->rx_q);
1238        skb_queue_head_init(&ndev->tx_q);
1239
1240        timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0);
1241        timer_setup(&ndev->data_timer, nci_data_timer, 0);
1242
1243        mutex_init(&ndev->req_lock);
1244        INIT_LIST_HEAD(&ndev->conn_info_list);
1245
1246        rc = nfc_register_device(ndev->nfc_dev);
1247        if (rc)
1248                goto destroy_tx_wq_exit;
1249
1250        goto exit;
1251
1252destroy_tx_wq_exit:
1253        destroy_workqueue(ndev->tx_wq);
1254
1255destroy_rx_wq_exit:
1256        destroy_workqueue(ndev->rx_wq);
1257
1258destroy_cmd_wq_exit:
1259        destroy_workqueue(ndev->cmd_wq);
1260
1261exit:
1262        return rc;
1263}
1264EXPORT_SYMBOL(nci_register_device);
1265
1266/**
1267 * nci_unregister_device - unregister a nci device in the nfc subsystem
1268 *
1269 * @ndev: The nci device to unregister
1270 */
1271void nci_unregister_device(struct nci_dev *ndev)
1272{
1273        struct nci_conn_info    *conn_info, *n;
1274
1275        nci_close_device(ndev);
1276
1277        destroy_workqueue(ndev->cmd_wq);
1278        destroy_workqueue(ndev->rx_wq);
1279        destroy_workqueue(ndev->tx_wq);
1280
1281        list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1282                list_del(&conn_info->list);
1283                /* conn_info is allocated with devm_kzalloc */
1284        }
1285
1286        nfc_unregister_device(ndev->nfc_dev);
1287}
1288EXPORT_SYMBOL(nci_unregister_device);
1289
1290/**
1291 * nci_recv_frame - receive frame from NCI drivers
1292 *
1293 * @ndev: The nci device
1294 * @skb: The sk_buff to receive
1295 */
1296int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1297{
1298        pr_debug("len %d\n", skb->len);
1299
1300        if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1301            !test_bit(NCI_INIT, &ndev->flags))) {
1302                kfree_skb(skb);
1303                return -ENXIO;
1304        }
1305
1306        /* Queue frame for rx worker thread */
1307        skb_queue_tail(&ndev->rx_q, skb);
1308        queue_work(ndev->rx_wq, &ndev->rx_work);
1309
1310        return 0;
1311}
1312EXPORT_SYMBOL(nci_recv_frame);
1313
1314int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1315{
1316        pr_debug("len %d\n", skb->len);
1317
1318        if (!ndev) {
1319                kfree_skb(skb);
1320                return -ENODEV;
1321        }
1322
1323        /* Get rid of skb owner, prior to sending to the driver. */
1324        skb_orphan(skb);
1325
1326        /* Send copy to sniffer */
1327        nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1328                             RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1329
1330        return ndev->ops->send(ndev, skb);
1331}
1332EXPORT_SYMBOL(nci_send_frame);
1333
1334/* Send NCI command */
1335int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
1336{
1337        struct nci_ctrl_hdr *hdr;
1338        struct sk_buff *skb;
1339
1340        pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1341
1342        skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1343        if (!skb) {
1344                pr_err("no memory for command\n");
1345                return -ENOMEM;
1346        }
1347
1348        hdr = skb_put(skb, NCI_CTRL_HDR_SIZE);
1349        hdr->gid = nci_opcode_gid(opcode);
1350        hdr->oid = nci_opcode_oid(opcode);
1351        hdr->plen = plen;
1352
1353        nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1354        nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1355
1356        if (plen)
1357                skb_put_data(skb, payload, plen);
1358
1359        skb_queue_tail(&ndev->cmd_q, skb);
1360        queue_work(ndev->cmd_wq, &ndev->cmd_work);
1361
1362        return 0;
1363}
1364EXPORT_SYMBOL(nci_send_cmd);
1365
1366/* Proprietary commands API */
1367static struct nci_driver_ops *ops_cmd_lookup(struct nci_driver_ops *ops,
1368                                             size_t n_ops,
1369                                             __u16 opcode)
1370{
1371        size_t i;
1372        struct nci_driver_ops *op;
1373
1374        if (!ops || !n_ops)
1375                return NULL;
1376
1377        for (i = 0; i < n_ops; i++) {
1378                op = &ops[i];
1379                if (op->opcode == opcode)
1380                        return op;
1381        }
1382
1383        return NULL;
1384}
1385
1386static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
1387                             struct sk_buff *skb, struct nci_driver_ops *ops,
1388                             size_t n_ops)
1389{
1390        struct nci_driver_ops *op;
1391
1392        op = ops_cmd_lookup(ops, n_ops, rsp_opcode);
1393        if (!op || !op->rsp)
1394                return -ENOTSUPP;
1395
1396        return op->rsp(ndev, skb);
1397}
1398
1399static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
1400                             struct sk_buff *skb, struct nci_driver_ops *ops,
1401                             size_t n_ops)
1402{
1403        struct nci_driver_ops *op;
1404
1405        op = ops_cmd_lookup(ops, n_ops, ntf_opcode);
1406        if (!op || !op->ntf)
1407                return -ENOTSUPP;
1408
1409        return op->ntf(ndev, skb);
1410}
1411
1412int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1413                        struct sk_buff *skb)
1414{
1415        return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1416                                 ndev->ops->n_prop_ops);
1417}
1418
1419int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1420                        struct sk_buff *skb)
1421{
1422        return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1423                                 ndev->ops->n_prop_ops);
1424}
1425
1426int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1427                        struct sk_buff *skb)
1428{
1429        return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops,
1430                                  ndev->ops->n_core_ops);
1431}
1432
1433int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1434                        struct sk_buff *skb)
1435{
1436        return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops,
1437                                 ndev->ops->n_core_ops);
1438}
1439
1440/* ---- NCI TX Data worker thread ---- */
1441
1442static void nci_tx_work(struct work_struct *work)
1443{
1444        struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1445        struct nci_conn_info    *conn_info;
1446        struct sk_buff *skb;
1447
1448        conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
1449        if (!conn_info)
1450                return;
1451
1452        pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1453
1454        /* Send queued tx data */
1455        while (atomic_read(&conn_info->credits_cnt)) {
1456                skb = skb_dequeue(&ndev->tx_q);
1457                if (!skb)
1458                        return;
1459
1460                /* Check if data flow control is used */
1461                if (atomic_read(&conn_info->credits_cnt) !=
1462                    NCI_DATA_FLOW_CONTROL_NOT_USED)
1463                        atomic_dec(&conn_info->credits_cnt);
1464
1465                pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1466                         nci_pbf(skb->data),
1467                         nci_conn_id(skb->data),
1468                         nci_plen(skb->data));
1469
1470                nci_send_frame(ndev, skb);
1471
1472                mod_timer(&ndev->data_timer,
1473                          jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1474        }
1475}
1476
1477/* ----- NCI RX worker thread (data & control) ----- */
1478
1479static void nci_rx_work(struct work_struct *work)
1480{
1481        struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1482        struct sk_buff *skb;
1483
1484        while ((skb = skb_dequeue(&ndev->rx_q))) {
1485
1486                /* Send copy to sniffer */
1487                nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1488                                     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1489
1490                /* Process frame */
1491                switch (nci_mt(skb->data)) {
1492                case NCI_MT_RSP_PKT:
1493                        nci_rsp_packet(ndev, skb);
1494                        break;
1495
1496                case NCI_MT_NTF_PKT:
1497                        nci_ntf_packet(ndev, skb);
1498                        break;
1499
1500                case NCI_MT_DATA_PKT:
1501                        nci_rx_data_packet(ndev, skb);
1502                        break;
1503
1504                default:
1505                        pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1506                        kfree_skb(skb);
1507                        break;
1508                }
1509        }
1510
1511        /* check if a data exchange timeout has occurred */
1512        if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1513                /* complete the data exchange transaction, if exists */
1514                if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1515                        nci_data_exchange_complete(ndev, NULL,
1516                                                   ndev->cur_conn_id,
1517                                                   -ETIMEDOUT);
1518
1519                clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1520        }
1521}
1522
1523/* ----- NCI TX CMD worker thread ----- */
1524
1525static void nci_cmd_work(struct work_struct *work)
1526{
1527        struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1528        struct sk_buff *skb;
1529
1530        pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1531
1532        /* Send queued command */
1533        if (atomic_read(&ndev->cmd_cnt)) {
1534                skb = skb_dequeue(&ndev->cmd_q);
1535                if (!skb)
1536                        return;
1537
1538                atomic_dec(&ndev->cmd_cnt);
1539
1540                pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1541                         nci_pbf(skb->data),
1542                         nci_opcode_gid(nci_opcode(skb->data)),
1543                         nci_opcode_oid(nci_opcode(skb->data)),
1544                         nci_plen(skb->data));
1545
1546                nci_send_frame(ndev, skb);
1547
1548                mod_timer(&ndev->cmd_timer,
1549                          jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1550        }
1551}
1552
1553MODULE_LICENSE("GPL");
1554