nfc/nci/ntf.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) 2014 Marvell International Ltd.
   7  *  Copyright (C) 2011 Texas Instruments, Inc.
   8  *
   9  *  Written by Ilan Elias <ilane@ti.com>
  10  *
  11  *  Acknowledgements:
  12  *  This file is based on hci_event.c, which was written
  13  *  by Maxim Krasnyansky.
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  17
  18 #include <linux/types.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/bitops.h>
  21 #include <linux/skbuff.h>
  22
  23 #include "../nfc.h"
  24 #include <net/nfc/nci.h>
  25 #include <net/nfc/nci_core.h>
  26 #include <linux/nfc.h>
  27
  28 /* Handle NCI Notification packets */
  29
  30 static void nci_core_reset_ntf_packet(struct nci_dev *ndev,
  31                                       const struct sk_buff *skb)
  32 {
  33         /* Handle NCI 2.x core reset notification */
  34         const struct nci_core_reset_ntf *ntf = (void *)skb->data;
  35
  36         ndev->nci_ver = ntf->nci_ver;
  37         pr_debug("nci_ver 0x%x, config_status 0x%x\n",
  38                  ntf->nci_ver, ntf->config_status);
  39
  40         ndev->manufact_id = ntf->manufact_id;
  41         ndev->manufact_specific_info =
  42                 __le32_to_cpu(ntf->manufact_specific_info);
  43
  44         nci_req_complete(ndev, NCI_STATUS_OK);
  45 }
  46
  47 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
  48                                              struct sk_buff *skb)
  49 {
  50         struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
  51         struct nci_conn_info *conn_info;
  52         int i;
  53
  54         pr_debug("num_entries %d\n", ntf->num_entries);
  55
  56         if (ntf->num_entries > NCI_MAX_NUM_CONN)
  57                 ntf->num_entries = NCI_MAX_NUM_CONN;
  58
  59         /* update the credits */
  60         for (i = 0; i < ntf->num_entries; i++) {
  61                 ntf->conn_entries[i].conn_id =
  62                         nci_conn_id(&ntf->conn_entries[i].conn_id);
  63
  64                 pr_debug("entry[%d]: conn_id %d, credits %d\n",
  65                          i, ntf->conn_entries[i].conn_id,
  66                          ntf->conn_entries[i].credits);
  67
  68                 conn_info = nci_get_conn_info_by_conn_id(ndev,
  69                                                          ntf->conn_entries[i].conn_id);
  70                 if (!conn_info)
  71                         return;
  72
  73                 atomic_add(ntf->conn_entries[i].credits,
  74                            &conn_info->credits_cnt);
  75         }
  76
  77         /* trigger the next tx */
  78         if (!skb_queue_empty(&ndev->tx_q))
  79                 queue_work(ndev->tx_wq, &ndev->tx_work);
  80 }
  81
  82 static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
  83                                               const struct sk_buff *skb)
  84 {
  85         __u8 status = skb->data[0];
  86
  87         pr_debug("status 0x%x\n", status);
  88
  89         if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
  90                 /* Activation failed, so complete the request
  91                    (the state remains the same) */
  92                 nci_req_complete(ndev, status);
  93         }
  94 }
  95
  96 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
  97                                                 struct sk_buff *skb)
  98 {
  99         struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
 100
 101         ntf->conn_id = nci_conn_id(&ntf->conn_id);
 102
 103         pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
 104
 105         /* complete the data exchange transaction, if exists */
 106         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 107                 nci_data_exchange_complete(ndev, NULL, ntf->conn_id, -EIO);
 108 }
 109
 110 static const __u8 *
 111 nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
 112                                         struct rf_tech_specific_params_nfca_poll *nfca_poll,
 113                                         const __u8 *data)
 114 {
 115         nfca_poll->sens_res = __le16_to_cpu(*((__le16 *)data));
 116         data += 2;
 117
 118         nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);
 119
 120         pr_debug("sens_res 0x%x, nfcid1_len %d\n",
 121                  nfca_poll->sens_res, nfca_poll->nfcid1_len);
 122
 123         memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
 124         data += nfca_poll->nfcid1_len;
 125
 126         nfca_poll->sel_res_len = *data++;
 127
 128         if (nfca_poll->sel_res_len != 0)
 129                 nfca_poll->sel_res = *data++;
 130
 131         pr_debug("sel_res_len %d, sel_res 0x%x\n",
 132                  nfca_poll->sel_res_len,
 133                  nfca_poll->sel_res);
 134
 135         return data;
 136 }
 137
 138 static const __u8 *
 139 nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
 140                                         struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
 141                                         const __u8 *data)
 142 {
 143         nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
 144
 145         pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
 146
 147         memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
 148         data += nfcb_poll->sensb_res_len;
 149
 150         return data;
 151 }
 152
 153 static const __u8 *
 154 nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
 155                                         struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
 156                                         const __u8 *data)
 157 {
 158         nfcf_poll->bit_rate = *data++;
 159         nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
 160
 161         pr_debug("bit_rate %d, sensf_res_len %d\n",
 162                  nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
 163
 164         memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
 165         data += nfcf_poll->sensf_res_len;
 166
 167         return data;
 168 }
 169
 170 static const __u8 *
 171 nci_extract_rf_params_nfcv_passive_poll(struct nci_dev *ndev,
 172                                         struct rf_tech_specific_params_nfcv_poll *nfcv_poll,
 173                                         const __u8 *data)
 174 {
 175         ++data;
 176         nfcv_poll->dsfid = *data++;
 177         memcpy(nfcv_poll->uid, data, NFC_ISO15693_UID_MAXSIZE);
 178         data += NFC_ISO15693_UID_MAXSIZE;
 179         return data;
 180 }
 181
 182 static const __u8 *
 183 nci_extract_rf_params_nfcf_passive_listen(struct nci_dev *ndev,
 184                                           struct rf_tech_specific_params_nfcf_listen *nfcf_listen,
 185                                           const __u8 *data)
 186 {
 187         nfcf_listen->local_nfcid2_len = min_t(__u8, *data++,
 188                                               NFC_NFCID2_MAXSIZE);
 189         memcpy(nfcf_listen->local_nfcid2, data, nfcf_listen->local_nfcid2_len);
 190         data += nfcf_listen->local_nfcid2_len;
 191
 192         return data;
 193 }
 194
 195 static __u32 nci_get_prop_rf_protocol(struct nci_dev *ndev, __u8 rf_protocol)
 196 {
 197         if (ndev->ops->get_rfprotocol)
 198                 return ndev->ops->get_rfprotocol(ndev, rf_protocol);
 199         return 0;
 200 }
 201
 202 static int nci_add_new_protocol(struct nci_dev *ndev,
 203                                 struct nfc_target *target,
 204                                 __u8 rf_protocol,
 205                                 __u8 rf_tech_and_mode,
 206                                 const void *params)
 207 {
 208         const struct rf_tech_specific_params_nfca_poll *nfca_poll;
 209         const struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
 210         const struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
 211         const struct rf_tech_specific_params_nfcv_poll *nfcv_poll;
 212         __u32 protocol;
 213
 214         if (rf_protocol == NCI_RF_PROTOCOL_T1T)
 215                 protocol = NFC_PROTO_JEWEL_MASK;
 216         else if (rf_protocol == NCI_RF_PROTOCOL_T2T)
 217                 protocol = NFC_PROTO_MIFARE_MASK;
 218         else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
 219                 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
 220                         protocol = NFC_PROTO_ISO14443_MASK;
 221                 else
 222                         protocol = NFC_PROTO_ISO14443_B_MASK;
 223         else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
 224                 protocol = NFC_PROTO_FELICA_MASK;
 225         else if (rf_protocol == NCI_RF_PROTOCOL_NFC_DEP)
 226                 protocol = NFC_PROTO_NFC_DEP_MASK;
 227         else if (rf_protocol == NCI_RF_PROTOCOL_T5T)
 228                 protocol = NFC_PROTO_ISO15693_MASK;
 229         else
 230                 protocol = nci_get_prop_rf_protocol(ndev, rf_protocol);
 231
 232         if (!(protocol & ndev->poll_prots)) {
 233                 pr_err("the target found does not have the desired protocol\n");
 234                 return -EPROTO;
 235         }
 236
 237         if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
 238                 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
 239
 240                 target->sens_res = nfca_poll->sens_res;
 241                 target->sel_res = nfca_poll->sel_res;
 242                 target->nfcid1_len = nfca_poll->nfcid1_len;
 243                 if (target->nfcid1_len > 0) {
 244                         memcpy(target->nfcid1, nfca_poll->nfcid1,
 245                                target->nfcid1_len);
 246                 }
 247         } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
 248                 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
 249
 250                 target->sensb_res_len = nfcb_poll->sensb_res_len;
 251                 if (target->sensb_res_len > 0) {
 252                         memcpy(target->sensb_res, nfcb_poll->sensb_res,
 253                                target->sensb_res_len);
 254                 }
 255         } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
 256                 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
 257
 258                 target->sensf_res_len = nfcf_poll->sensf_res_len;
 259                 if (target->sensf_res_len > 0) {
 260                         memcpy(target->sensf_res, nfcf_poll->sensf_res,
 261                                target->sensf_res_len);
 262                 }
 263         } else if (rf_tech_and_mode == NCI_NFC_V_PASSIVE_POLL_MODE) {
 264                 nfcv_poll = (struct rf_tech_specific_params_nfcv_poll *)params;
 265
 266                 target->is_iso15693 = 1;
 267                 target->iso15693_dsfid = nfcv_poll->dsfid;
 268                 memcpy(target->iso15693_uid, nfcv_poll->uid, NFC_ISO15693_UID_MAXSIZE);
 269         } else {
 270                 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
 271                 return -EPROTO;
 272         }
 273
 274         target->supported_protocols |= protocol;
 275
 276         pr_debug("protocol 0x%x\n", protocol);
 277
 278         return 0;
 279 }
 280
 281 static void nci_add_new_target(struct nci_dev *ndev,
 282                                const struct nci_rf_discover_ntf *ntf)
 283 {
 284         struct nfc_target *target;
 285         int i, rc;
 286
 287         for (i = 0; i < ndev->n_targets; i++) {
 288                 target = &ndev->targets[i];
 289                 if (target->logical_idx == ntf->rf_discovery_id) {
 290                         /* This target already exists, add the new protocol */
 291                         nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 292                                              ntf->rf_tech_and_mode,
 293                                              &ntf->rf_tech_specific_params);
 294                         return;
 295                 }
 296         }
 297
 298         /* This is a new target, check if we've enough room */
 299         if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
 300                 pr_debug("not enough room, ignoring new target...\n");
 301                 return;
 302         }
 303
 304         target = &ndev->targets[ndev->n_targets];
 305
 306         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 307                                   ntf->rf_tech_and_mode,
 308                                   &ntf->rf_tech_specific_params);
 309         if (!rc) {
 310                 target->logical_idx = ntf->rf_discovery_id;
 311                 ndev->n_targets++;
 312
 313                 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
 314                          ndev->n_targets);
 315         }
 316 }
 317
 318 void nci_clear_target_list(struct nci_dev *ndev)
 319 {
 320         memset(ndev->targets, 0,
 321                (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
 322
 323         ndev->n_targets = 0;
 324 }
 325
 326 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
 327                                        const struct sk_buff *skb)
 328 {
 329         struct nci_rf_discover_ntf ntf;
 330         const __u8 *data = skb->data;
 331         bool add_target = true;
 332
 333         ntf.rf_discovery_id = *data++;
 334         ntf.rf_protocol = *data++;
 335         ntf.rf_tech_and_mode = *data++;
 336         ntf.rf_tech_specific_params_len = *data++;
 337
 338         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 339         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 340         pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
 341         pr_debug("rf_tech_specific_params_len %d\n",
 342                  ntf.rf_tech_specific_params_len);
 343
 344         if (ntf.rf_tech_specific_params_len > 0) {
 345                 switch (ntf.rf_tech_and_mode) {
 346                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 347                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 348                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 349                         break;
 350
 351                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 352                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 353                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 354                         break;
 355
 356                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 357                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 358                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 359                         break;
 360
 361                 case NCI_NFC_V_PASSIVE_POLL_MODE:
 362                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
 363                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
 364                         break;
 365
 366                 default:
 367                         pr_err("unsupported rf_tech_and_mode 0x%x\n",
 368                                ntf.rf_tech_and_mode);
 369                         data += ntf.rf_tech_specific_params_len;
 370                         add_target = false;
 371                 }
 372         }
 373
 374         ntf.ntf_type = *data++;
 375         pr_debug("ntf_type %d\n", ntf.ntf_type);
 376
 377         if (add_target == true)
 378                 nci_add_new_target(ndev, &ntf);
 379
 380         if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
 381                 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
 382         } else {
 383                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 384                 nfc_targets_found(ndev->nfc_dev, ndev->targets,
 385                                   ndev->n_targets);
 386         }
 387 }
 388
 389 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 390                                                  struct nci_rf_intf_activated_ntf *ntf,
 391                                                  const __u8 *data)
 392 {
 393         struct activation_params_nfca_poll_iso_dep *nfca_poll;
 394         struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
 395
 396         switch (ntf->activation_rf_tech_and_mode) {
 397         case NCI_NFC_A_PASSIVE_POLL_MODE:
 398                 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
 399                 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
 400                 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
 401                 if (nfca_poll->rats_res_len > 0) {
 402                         memcpy(nfca_poll->rats_res,
 403                                data, nfca_poll->rats_res_len);
 404                 }
 405                 break;
 406
 407         case NCI_NFC_B_PASSIVE_POLL_MODE:
 408                 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
 409                 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
 410                 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
 411                 if (nfcb_poll->attrib_res_len > 0) {
 412                         memcpy(nfcb_poll->attrib_res,
 413                                data, nfcb_poll->attrib_res_len);
 414                 }
 415                 break;
 416
 417         default:
 418                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 419                        ntf->activation_rf_tech_and_mode);
 420                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 421         }
 422
 423         return NCI_STATUS_OK;
 424 }
 425
 426 static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
 427                                                  struct nci_rf_intf_activated_ntf *ntf,
 428                                                  const __u8 *data)
 429 {
 430         struct activation_params_poll_nfc_dep *poll;
 431         struct activation_params_listen_nfc_dep *listen;
 432
 433         switch (ntf->activation_rf_tech_and_mode) {
 434         case NCI_NFC_A_PASSIVE_POLL_MODE:
 435         case NCI_NFC_F_PASSIVE_POLL_MODE:
 436                 poll = &ntf->activation_params.poll_nfc_dep;
 437                 poll->atr_res_len = min_t(__u8, *data++,
 438                                           NFC_ATR_RES_MAXSIZE - 2);
 439                 pr_debug("atr_res_len %d\n", poll->atr_res_len);
 440                 if (poll->atr_res_len > 0)
 441                         memcpy(poll->atr_res, data, poll->atr_res_len);
 442                 break;
 443
 444         case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 445         case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 446                 listen = &ntf->activation_params.listen_nfc_dep;
 447                 listen->atr_req_len = min_t(__u8, *data++,
 448                                             NFC_ATR_REQ_MAXSIZE - 2);
 449                 pr_debug("atr_req_len %d\n", listen->atr_req_len);
 450                 if (listen->atr_req_len > 0)
 451                         memcpy(listen->atr_req, data, listen->atr_req_len);
 452                 break;
 453
 454         default:
 455                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 456                        ntf->activation_rf_tech_and_mode);
 457                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 458         }
 459
 460         return NCI_STATUS_OK;
 461 }
 462
 463 static void nci_target_auto_activated(struct nci_dev *ndev,
 464                                       const struct nci_rf_intf_activated_ntf *ntf)
 465 {
 466         struct nfc_target *target;
 467         int rc;
 468
 469         target = &ndev->targets[ndev->n_targets];
 470
 471         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 472                                   ntf->activation_rf_tech_and_mode,
 473                                   &ntf->rf_tech_specific_params);
 474         if (rc)
 475                 return;
 476
 477         target->logical_idx = ntf->rf_discovery_id;
 478         ndev->n_targets++;
 479
 480         pr_debug("logical idx %d, n_targets %d\n",
 481                  target->logical_idx, ndev->n_targets);
 482
 483         nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
 484 }
 485
 486 static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
 487                                            const struct nci_rf_intf_activated_ntf *ntf)
 488 {
 489         ndev->remote_gb_len = 0;
 490
 491         if (ntf->activation_params_len <= 0)
 492                 return NCI_STATUS_OK;
 493
 494         switch (ntf->activation_rf_tech_and_mode) {
 495         case NCI_NFC_A_PASSIVE_POLL_MODE:
 496         case NCI_NFC_F_PASSIVE_POLL_MODE:
 497                 ndev->remote_gb_len = min_t(__u8,
 498                         (ntf->activation_params.poll_nfc_dep.atr_res_len
 499                                                 - NFC_ATR_RES_GT_OFFSET),
 500                         NFC_ATR_RES_GB_MAXSIZE);
 501                 memcpy(ndev->remote_gb,
 502                        (ntf->activation_params.poll_nfc_dep.atr_res
 503                                                 + NFC_ATR_RES_GT_OFFSET),
 504                        ndev->remote_gb_len);
 505                 break;
 506
 507         case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 508         case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 509                 ndev->remote_gb_len = min_t(__u8,
 510                         (ntf->activation_params.listen_nfc_dep.atr_req_len
 511                                                 - NFC_ATR_REQ_GT_OFFSET),
 512                         NFC_ATR_REQ_GB_MAXSIZE);
 513                 memcpy(ndev->remote_gb,
 514                        (ntf->activation_params.listen_nfc_dep.atr_req
 515                                                 + NFC_ATR_REQ_GT_OFFSET),
 516                        ndev->remote_gb_len);
 517                 break;
 518
 519         default:
 520                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 521                        ntf->activation_rf_tech_and_mode);
 522                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 523         }
 524
 525         return NCI_STATUS_OK;
 526 }
 527
 528 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 529                                              const struct sk_buff *skb)
 530 {
 531         struct nci_conn_info *conn_info;
 532         struct nci_rf_intf_activated_ntf ntf;
 533         const __u8 *data = skb->data;
 534         int err = NCI_STATUS_OK;
 535
 536         ntf.rf_discovery_id = *data++;
 537         ntf.rf_interface = *data++;
 538         ntf.rf_protocol = *data++;
 539         ntf.activation_rf_tech_and_mode = *data++;
 540         ntf.max_data_pkt_payload_size = *data++;
 541         ntf.initial_num_credits = *data++;
 542         ntf.rf_tech_specific_params_len = *data++;
 543
 544         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 545         pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
 546         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 547         pr_debug("activation_rf_tech_and_mode 0x%x\n",
 548                  ntf.activation_rf_tech_and_mode);
 549         pr_debug("max_data_pkt_payload_size 0x%x\n",
 550                  ntf.max_data_pkt_payload_size);
 551         pr_debug("initial_num_credits 0x%x\n",
 552                  ntf.initial_num_credits);
 553         pr_debug("rf_tech_specific_params_len %d\n",
 554                  ntf.rf_tech_specific_params_len);
 555
 556         /* If this contains a value of 0x00 (NFCEE Direct RF
 557          * Interface) then all following parameters SHALL contain a
 558          * value of 0 and SHALL be ignored.
 559          */
 560         if (ntf.rf_interface == NCI_RF_INTERFACE_NFCEE_DIRECT)
 561                 goto listen;
 562
 563         if (ntf.rf_tech_specific_params_len > 0) {
 564                 switch (ntf.activation_rf_tech_and_mode) {
 565                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 566                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 567                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 568                         break;
 569
 570                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 571                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 572                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 573                         break;
 574
 575                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 576                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 577                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 578                         break;
 579
 580                 case NCI_NFC_V_PASSIVE_POLL_MODE:
 581                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
 582                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
 583                         break;
 584
 585                 case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 586                         /* no RF technology specific parameters */
 587                         break;
 588
 589                 case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 590                         data = nci_extract_rf_params_nfcf_passive_listen(ndev,
 591                                 &(ntf.rf_tech_specific_params.nfcf_listen),
 592                                 data);
 593                         break;
 594
 595                 default:
 596                         pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 597                                ntf.activation_rf_tech_and_mode);
 598                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 599                         goto exit;
 600                 }
 601         }
 602
 603         ntf.data_exch_rf_tech_and_mode = *data++;
 604         ntf.data_exch_tx_bit_rate = *data++;
 605         ntf.data_exch_rx_bit_rate = *data++;
 606         ntf.activation_params_len = *data++;
 607
 608         pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
 609                  ntf.data_exch_rf_tech_and_mode);
 610         pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
 611         pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
 612         pr_debug("activation_params_len %d\n", ntf.activation_params_len);
 613
 614         if (ntf.activation_params_len > 0) {
 615                 switch (ntf.rf_interface) {
 616                 case NCI_RF_INTERFACE_ISO_DEP:
 617                         err = nci_extract_activation_params_iso_dep(ndev,
 618                                                                     &ntf, data);
 619                         break;
 620
 621                 case NCI_RF_INTERFACE_NFC_DEP:
 622                         err = nci_extract_activation_params_nfc_dep(ndev,
 623                                                                     &ntf, data);
 624                         break;
 625
 626                 case NCI_RF_INTERFACE_FRAME:
 627                         /* no activation params */
 628                         break;
 629
 630                 default:
 631                         pr_err("unsupported rf_interface 0x%x\n",
 632                                ntf.rf_interface);
 633                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 634                         break;
 635                 }
 636         }
 637
 638 exit:
 639         if (err == NCI_STATUS_OK) {
 640                 conn_info = ndev->rf_conn_info;
 641                 if (!conn_info)
 642                         return;
 643
 644                 conn_info->max_pkt_payload_len = ntf.max_data_pkt_payload_size;
 645                 conn_info->initial_num_credits = ntf.initial_num_credits;
 646
 647                 /* set the available credits to initial value */
 648                 atomic_set(&conn_info->credits_cnt,
 649                            conn_info->initial_num_credits);
 650
 651                 /* store general bytes to be reported later in dep_link_up */
 652                 if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
 653                         err = nci_store_general_bytes_nfc_dep(ndev, &ntf);
 654                         if (err != NCI_STATUS_OK)
 655                                 pr_err("unable to store general bytes\n");
 656                 }
 657         }
 658
 659         if (!(ntf.activation_rf_tech_and_mode & NCI_RF_TECH_MODE_LISTEN_MASK)) {
 660                 /* Poll mode */
 661                 if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
 662                         /* A single target was found and activated
 663                          * automatically */
 664                         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 665                         if (err == NCI_STATUS_OK)
 666                                 nci_target_auto_activated(ndev, &ntf);
 667                 } else {        /* ndev->state == NCI_W4_HOST_SELECT */
 668                         /* A selected target was activated, so complete the
 669                          * request */
 670                         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 671                         nci_req_complete(ndev, err);
 672                 }
 673         } else {
 674 listen:
 675                 /* Listen mode */
 676                 atomic_set(&ndev->state, NCI_LISTEN_ACTIVE);
 677                 if (err == NCI_STATUS_OK &&
 678                     ntf.rf_protocol == NCI_RF_PROTOCOL_NFC_DEP) {
 679                         err = nfc_tm_activated(ndev->nfc_dev,
 680                                                NFC_PROTO_NFC_DEP_MASK,
 681                                                NFC_COMM_PASSIVE,
 682                                                ndev->remote_gb,
 683                                                ndev->remote_gb_len);
 684                         if (err != NCI_STATUS_OK)
 685                                 pr_err("error when signaling tm activation\n");
 686                 }
 687         }
 688 }
 689
 690 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 691                                          const struct sk_buff *skb)
 692 {
 693         const struct nci_conn_info *conn_info;
 694         const struct nci_rf_deactivate_ntf *ntf = (void *)skb->data;
 695
 696         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 697
 698         conn_info = ndev->rf_conn_info;
 699         if (!conn_info)
 700                 return;
 701
 702         /* drop tx data queue */
 703         skb_queue_purge(&ndev->tx_q);
 704
 705         /* drop partial rx data packet */
 706         if (ndev->rx_data_reassembly) {
 707                 kfree_skb(ndev->rx_data_reassembly);
 708                 ndev->rx_data_reassembly = NULL;
 709         }
 710
 711         /* complete the data exchange transaction, if exists */
 712         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 713                 nci_data_exchange_complete(ndev, NULL, NCI_STATIC_RF_CONN_ID,
 714                                            -EIO);
 715
 716         switch (ntf->type) {
 717         case NCI_DEACTIVATE_TYPE_IDLE_MODE:
 718                 nci_clear_target_list(ndev);
 719                 atomic_set(&ndev->state, NCI_IDLE);
 720                 break;
 721         case NCI_DEACTIVATE_TYPE_SLEEP_MODE:
 722         case NCI_DEACTIVATE_TYPE_SLEEP_AF_MODE:
 723                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 724                 break;
 725         case NCI_DEACTIVATE_TYPE_DISCOVERY:
 726                 nci_clear_target_list(ndev);
 727                 atomic_set(&ndev->state, NCI_DISCOVERY);
 728                 break;
 729         }
 730
 731         nci_req_complete(ndev, NCI_STATUS_OK);
 732 }
 733
 734 static void nci_nfcee_discover_ntf_packet(struct nci_dev *ndev,
 735                                           const struct sk_buff *skb)
 736 {
 737         u8 status = NCI_STATUS_OK;
 738         const struct nci_nfcee_discover_ntf *nfcee_ntf =
 739                                 (struct nci_nfcee_discover_ntf *)skb->data;
 740
 741         pr_debug("\n");
 742
 743         /* NFCForum NCI 9.2.1 HCI Network Specific Handling
 744          * If the NFCC supports the HCI Network, it SHALL return one,
 745          * and only one, NFCEE_DISCOVER_NTF with a Protocol type of
 746          * “HCI Access”, even if the HCI Network contains multiple NFCEEs.
 747          */
 748         ndev->hci_dev->nfcee_id = nfcee_ntf->nfcee_id;
 749         ndev->cur_params.id = nfcee_ntf->nfcee_id;
 750
 751         nci_req_complete(ndev, status);
 752 }
 753
 754 static void nci_nfcee_action_ntf_packet(struct nci_dev *ndev,
 755                                         const struct sk_buff *skb)
 756 {
 757         pr_debug("\n");
 758 }
 759
 760 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 761 {
 762         __u16 ntf_opcode = nci_opcode(skb->data);
 763
 764         pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 765                  nci_pbf(skb->data),
 766                  nci_opcode_gid(ntf_opcode),
 767                  nci_opcode_oid(ntf_opcode),
 768                  nci_plen(skb->data));
 769
 770         /* strip the nci control header */
 771         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 772
 773         if (nci_opcode_gid(ntf_opcode) == NCI_GID_PROPRIETARY) {
 774                 if (nci_prop_ntf_packet(ndev, ntf_opcode, skb) == -ENOTSUPP) {
 775                         pr_err("unsupported ntf opcode 0x%x\n",
 776                                ntf_opcode);
 777                 }
 778
 779                 goto end;
 780         }
 781
 782         switch (ntf_opcode) {
 783         case NCI_OP_CORE_RESET_NTF:
 784                 nci_core_reset_ntf_packet(ndev, skb);
 785                 break;
 786
 787         case NCI_OP_CORE_CONN_CREDITS_NTF:
 788                 nci_core_conn_credits_ntf_packet(ndev, skb);
 789                 break;
 790
 791         case NCI_OP_CORE_GENERIC_ERROR_NTF:
 792                 nci_core_generic_error_ntf_packet(ndev, skb);
 793                 break;
 794
 795         case NCI_OP_CORE_INTF_ERROR_NTF:
 796                 nci_core_conn_intf_error_ntf_packet(ndev, skb);
 797                 break;
 798
 799         case NCI_OP_RF_DISCOVER_NTF:
 800                 nci_rf_discover_ntf_packet(ndev, skb);
 801                 break;
 802
 803         case NCI_OP_RF_INTF_ACTIVATED_NTF:
 804                 nci_rf_intf_activated_ntf_packet(ndev, skb);
 805                 break;
 806
 807         case NCI_OP_RF_DEACTIVATE_NTF:
 808                 nci_rf_deactivate_ntf_packet(ndev, skb);
 809                 break;
 810
 811         case NCI_OP_NFCEE_DISCOVER_NTF:
 812                 nci_nfcee_discover_ntf_packet(ndev, skb);
 813                 break;
 814
 815         case NCI_OP_RF_NFCEE_ACTION_NTF:
 816                 nci_nfcee_action_ntf_packet(ndev, skb);
 817                 break;
 818
 819         default:
 820                 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
 821                 break;
 822         }
 823
 824         nci_core_ntf_packet(ndev, ntf_opcode, skb);
 825 end:
 826         kfree_skb(skb);
 827 }