net/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 > ARRAY_SIZE(target->nfcid1))
 244                         return -EPROTO;
 245                 if (target->nfcid1_len > 0) {
 246                         memcpy(target->nfcid1, nfca_poll->nfcid1,
 247                                target->nfcid1_len);
 248                 }
 249         } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
 250                 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
 251
 252                 target->sensb_res_len = nfcb_poll->sensb_res_len;
 253                 if (target->sensb_res_len > ARRAY_SIZE(target->sensb_res))
 254                         return -EPROTO;
 255                 if (target->sensb_res_len > 0) {
 256                         memcpy(target->sensb_res, nfcb_poll->sensb_res,
 257                                target->sensb_res_len);
 258                 }
 259         } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
 260                 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
 261
 262                 target->sensf_res_len = nfcf_poll->sensf_res_len;
 263                 if (target->sensf_res_len > ARRAY_SIZE(target->sensf_res))
 264                         return -EPROTO;
 265                 if (target->sensf_res_len > 0) {
 266                         memcpy(target->sensf_res, nfcf_poll->sensf_res,
 267                                target->sensf_res_len);
 268                 }
 269         } else if (rf_tech_and_mode == NCI_NFC_V_PASSIVE_POLL_MODE) {
 270                 nfcv_poll = (struct rf_tech_specific_params_nfcv_poll *)params;
 271
 272                 target->is_iso15693 = 1;
 273                 target->iso15693_dsfid = nfcv_poll->dsfid;
 274                 memcpy(target->iso15693_uid, nfcv_poll->uid, NFC_ISO15693_UID_MAXSIZE);
 275         } else {
 276                 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
 277                 return -EPROTO;
 278         }
 279
 280         target->supported_protocols |= protocol;
 281
 282         pr_debug("protocol 0x%x\n", protocol);
 283
 284         return 0;
 285 }
 286
 287 static void nci_add_new_target(struct nci_dev *ndev,
 288                                const struct nci_rf_discover_ntf *ntf)
 289 {
 290         struct nfc_target *target;
 291         int i, rc;
 292
 293         for (i = 0; i < ndev->n_targets; i++) {
 294                 target = &ndev->targets[i];
 295                 if (target->logical_idx == ntf->rf_discovery_id) {
 296                         /* This target already exists, add the new protocol */
 297                         nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 298                                              ntf->rf_tech_and_mode,
 299                                              &ntf->rf_tech_specific_params);
 300                         return;
 301                 }
 302         }
 303
 304         /* This is a new target, check if we've enough room */
 305         if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
 306                 pr_debug("not enough room, ignoring new target...\n");
 307                 return;
 308         }
 309
 310         target = &ndev->targets[ndev->n_targets];
 311
 312         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 313                                   ntf->rf_tech_and_mode,
 314                                   &ntf->rf_tech_specific_params);
 315         if (!rc) {
 316                 target->logical_idx = ntf->rf_discovery_id;
 317                 ndev->n_targets++;
 318
 319                 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
 320                          ndev->n_targets);
 321         }
 322 }
 323
 324 void nci_clear_target_list(struct nci_dev *ndev)
 325 {
 326         memset(ndev->targets, 0,
 327                (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
 328
 329         ndev->n_targets = 0;
 330 }
 331
 332 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
 333                                        const struct sk_buff *skb)
 334 {
 335         struct nci_rf_discover_ntf ntf;
 336         const __u8 *data = skb->data;
 337         bool add_target = true;
 338
 339         ntf.rf_discovery_id = *data++;
 340         ntf.rf_protocol = *data++;
 341         ntf.rf_tech_and_mode = *data++;
 342         ntf.rf_tech_specific_params_len = *data++;
 343
 344         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 345         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 346         pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
 347         pr_debug("rf_tech_specific_params_len %d\n",
 348                  ntf.rf_tech_specific_params_len);
 349
 350         if (ntf.rf_tech_specific_params_len > 0) {
 351                 switch (ntf.rf_tech_and_mode) {
 352                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 353                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 354                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 355                         break;
 356
 357                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 358                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 359                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 360                         break;
 361
 362                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 363                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 364                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 365                         break;
 366
 367                 case NCI_NFC_V_PASSIVE_POLL_MODE:
 368                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
 369                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
 370                         break;
 371
 372                 default:
 373                         pr_err("unsupported rf_tech_and_mode 0x%x\n",
 374                                ntf.rf_tech_and_mode);
 375                         data += ntf.rf_tech_specific_params_len;
 376                         add_target = false;
 377                 }
 378         }
 379
 380         ntf.ntf_type = *data++;
 381         pr_debug("ntf_type %d\n", ntf.ntf_type);
 382
 383         if (add_target == true)
 384                 nci_add_new_target(ndev, &ntf);
 385
 386         if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
 387                 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
 388         } else {
 389                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 390                 nfc_targets_found(ndev->nfc_dev, ndev->targets,
 391                                   ndev->n_targets);
 392         }
 393 }
 394
 395 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 396                                                  struct nci_rf_intf_activated_ntf *ntf,
 397                                                  const __u8 *data)
 398 {
 399         struct activation_params_nfca_poll_iso_dep *nfca_poll;
 400         struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
 401
 402         switch (ntf->activation_rf_tech_and_mode) {
 403         case NCI_NFC_A_PASSIVE_POLL_MODE:
 404                 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
 405                 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
 406                 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
 407                 if (nfca_poll->rats_res_len > 0) {
 408                         memcpy(nfca_poll->rats_res,
 409                                data, nfca_poll->rats_res_len);
 410                 }
 411                 break;
 412
 413         case NCI_NFC_B_PASSIVE_POLL_MODE:
 414                 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
 415                 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
 416                 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
 417                 if (nfcb_poll->attrib_res_len > 0) {
 418                         memcpy(nfcb_poll->attrib_res,
 419                                data, nfcb_poll->attrib_res_len);
 420                 }
 421                 break;
 422
 423         default:
 424                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 425                        ntf->activation_rf_tech_and_mode);
 426                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 427         }
 428
 429         return NCI_STATUS_OK;
 430 }
 431
 432 static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
 433                                                  struct nci_rf_intf_activated_ntf *ntf,
 434                                                  const __u8 *data)
 435 {
 436         struct activation_params_poll_nfc_dep *poll;
 437         struct activation_params_listen_nfc_dep *listen;
 438
 439         switch (ntf->activation_rf_tech_and_mode) {
 440         case NCI_NFC_A_PASSIVE_POLL_MODE:
 441         case NCI_NFC_F_PASSIVE_POLL_MODE:
 442                 poll = &ntf->activation_params.poll_nfc_dep;
 443                 poll->atr_res_len = min_t(__u8, *data++,
 444                                           NFC_ATR_RES_MAXSIZE - 2);
 445                 pr_debug("atr_res_len %d\n", poll->atr_res_len);
 446                 if (poll->atr_res_len > 0)
 447                         memcpy(poll->atr_res, data, poll->atr_res_len);
 448                 break;
 449
 450         case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 451         case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 452                 listen = &ntf->activation_params.listen_nfc_dep;
 453                 listen->atr_req_len = min_t(__u8, *data++,
 454                                             NFC_ATR_REQ_MAXSIZE - 2);
 455                 pr_debug("atr_req_len %d\n", listen->atr_req_len);
 456                 if (listen->atr_req_len > 0)
 457                         memcpy(listen->atr_req, data, listen->atr_req_len);
 458                 break;
 459
 460         default:
 461                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 462                        ntf->activation_rf_tech_and_mode);
 463                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 464         }
 465
 466         return NCI_STATUS_OK;
 467 }
 468
 469 static void nci_target_auto_activated(struct nci_dev *ndev,
 470                                       const struct nci_rf_intf_activated_ntf *ntf)
 471 {
 472         struct nfc_target *target;
 473         int rc;
 474
 475         target = &ndev->targets[ndev->n_targets];
 476
 477         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 478                                   ntf->activation_rf_tech_and_mode,
 479                                   &ntf->rf_tech_specific_params);
 480         if (rc)
 481                 return;
 482
 483         target->logical_idx = ntf->rf_discovery_id;
 484         ndev->n_targets++;
 485
 486         pr_debug("logical idx %d, n_targets %d\n",
 487                  target->logical_idx, ndev->n_targets);
 488
 489         nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
 490 }
 491
 492 static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
 493                                            const struct nci_rf_intf_activated_ntf *ntf)
 494 {
 495         ndev->remote_gb_len = 0;
 496
 497         if (ntf->activation_params_len <= 0)
 498                 return NCI_STATUS_OK;
 499
 500         switch (ntf->activation_rf_tech_and_mode) {
 501         case NCI_NFC_A_PASSIVE_POLL_MODE:
 502         case NCI_NFC_F_PASSIVE_POLL_MODE:
 503                 ndev->remote_gb_len = min_t(__u8,
 504                         (ntf->activation_params.poll_nfc_dep.atr_res_len
 505                                                 - NFC_ATR_RES_GT_OFFSET),
 506                         NFC_ATR_RES_GB_MAXSIZE);
 507                 memcpy(ndev->remote_gb,
 508                        (ntf->activation_params.poll_nfc_dep.atr_res
 509                                                 + NFC_ATR_RES_GT_OFFSET),
 510                        ndev->remote_gb_len);
 511                 break;
 512
 513         case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 514         case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 515                 ndev->remote_gb_len = min_t(__u8,
 516                         (ntf->activation_params.listen_nfc_dep.atr_req_len
 517                                                 - NFC_ATR_REQ_GT_OFFSET),
 518                         NFC_ATR_REQ_GB_MAXSIZE);
 519                 memcpy(ndev->remote_gb,
 520                        (ntf->activation_params.listen_nfc_dep.atr_req
 521                                                 + NFC_ATR_REQ_GT_OFFSET),
 522                        ndev->remote_gb_len);
 523                 break;
 524
 525         default:
 526                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 527                        ntf->activation_rf_tech_and_mode);
 528                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 529         }
 530
 531         return NCI_STATUS_OK;
 532 }
 533
 534 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 535                                              const struct sk_buff *skb)
 536 {
 537         struct nci_conn_info *conn_info;
 538         struct nci_rf_intf_activated_ntf ntf;
 539         const __u8 *data = skb->data;
 540         int err = NCI_STATUS_OK;
 541
 542         ntf.rf_discovery_id = *data++;
 543         ntf.rf_interface = *data++;
 544         ntf.rf_protocol = *data++;
 545         ntf.activation_rf_tech_and_mode = *data++;
 546         ntf.max_data_pkt_payload_size = *data++;
 547         ntf.initial_num_credits = *data++;
 548         ntf.rf_tech_specific_params_len = *data++;
 549
 550         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 551         pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
 552         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 553         pr_debug("activation_rf_tech_and_mode 0x%x\n",
 554                  ntf.activation_rf_tech_and_mode);
 555         pr_debug("max_data_pkt_payload_size 0x%x\n",
 556                  ntf.max_data_pkt_payload_size);
 557         pr_debug("initial_num_credits 0x%x\n",
 558                  ntf.initial_num_credits);
 559         pr_debug("rf_tech_specific_params_len %d\n",
 560                  ntf.rf_tech_specific_params_len);
 561
 562         /* If this contains a value of 0x00 (NFCEE Direct RF
 563          * Interface) then all following parameters SHALL contain a
 564          * value of 0 and SHALL be ignored.
 565          */
 566         if (ntf.rf_interface == NCI_RF_INTERFACE_NFCEE_DIRECT)
 567                 goto listen;
 568
 569         if (ntf.rf_tech_specific_params_len > 0) {
 570                 switch (ntf.activation_rf_tech_and_mode) {
 571                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 572                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 573                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 574                         break;
 575
 576                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 577                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 578                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 579                         break;
 580
 581                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 582                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 583                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 584                         break;
 585
 586                 case NCI_NFC_V_PASSIVE_POLL_MODE:
 587                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
 588                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
 589                         break;
 590
 591                 case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 592                         /* no RF technology specific parameters */
 593                         break;
 594
 595                 case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 596                         data = nci_extract_rf_params_nfcf_passive_listen(ndev,
 597                                 &(ntf.rf_tech_specific_params.nfcf_listen),
 598                                 data);
 599                         break;
 600
 601                 default:
 602                         pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 603                                ntf.activation_rf_tech_and_mode);
 604                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 605                         goto exit;
 606                 }
 607         }
 608
 609         ntf.data_exch_rf_tech_and_mode = *data++;
 610         ntf.data_exch_tx_bit_rate = *data++;
 611         ntf.data_exch_rx_bit_rate = *data++;
 612         ntf.activation_params_len = *data++;
 613
 614         pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
 615                  ntf.data_exch_rf_tech_and_mode);
 616         pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
 617         pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
 618         pr_debug("activation_params_len %d\n", ntf.activation_params_len);
 619
 620         if (ntf.activation_params_len > 0) {
 621                 switch (ntf.rf_interface) {
 622                 case NCI_RF_INTERFACE_ISO_DEP:
 623                         err = nci_extract_activation_params_iso_dep(ndev,
 624                                                                     &ntf, data);
 625                         break;
 626
 627                 case NCI_RF_INTERFACE_NFC_DEP:
 628                         err = nci_extract_activation_params_nfc_dep(ndev,
 629                                                                     &ntf, data);
 630                         break;
 631
 632                 case NCI_RF_INTERFACE_FRAME:
 633                         /* no activation params */
 634                         break;
 635
 636                 default:
 637                         pr_err("unsupported rf_interface 0x%x\n",
 638                                ntf.rf_interface);
 639                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 640                         break;
 641                 }
 642         }
 643
 644 exit:
 645         if (err == NCI_STATUS_OK) {
 646                 conn_info = ndev->rf_conn_info;
 647                 if (!conn_info)
 648                         return;
 649
 650                 conn_info->max_pkt_payload_len = ntf.max_data_pkt_payload_size;
 651                 conn_info->initial_num_credits = ntf.initial_num_credits;
 652
 653                 /* set the available credits to initial value */
 654                 atomic_set(&conn_info->credits_cnt,
 655                            conn_info->initial_num_credits);
 656
 657                 /* store general bytes to be reported later in dep_link_up */
 658                 if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
 659                         err = nci_store_general_bytes_nfc_dep(ndev, &ntf);
 660                         if (err != NCI_STATUS_OK)
 661                                 pr_err("unable to store general bytes\n");
 662                 }
 663         }
 664
 665         if (!(ntf.activation_rf_tech_and_mode & NCI_RF_TECH_MODE_LISTEN_MASK)) {
 666                 /* Poll mode */
 667                 if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
 668                         /* A single target was found and activated
 669                          * automatically */
 670                         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 671                         if (err == NCI_STATUS_OK)
 672                                 nci_target_auto_activated(ndev, &ntf);
 673                 } else {        /* ndev->state == NCI_W4_HOST_SELECT */
 674                         /* A selected target was activated, so complete the
 675                          * request */
 676                         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 677                         nci_req_complete(ndev, err);
 678                 }
 679         } else {
 680 listen:
 681                 /* Listen mode */
 682                 atomic_set(&ndev->state, NCI_LISTEN_ACTIVE);
 683                 if (err == NCI_STATUS_OK &&
 684                     ntf.rf_protocol == NCI_RF_PROTOCOL_NFC_DEP) {
 685                         err = nfc_tm_activated(ndev->nfc_dev,
 686                                                NFC_PROTO_NFC_DEP_MASK,
 687                                                NFC_COMM_PASSIVE,
 688                                                ndev->remote_gb,
 689                                                ndev->remote_gb_len);
 690                         if (err != NCI_STATUS_OK)
 691                                 pr_err("error when signaling tm activation\n");
 692                 }
 693         }
 694 }
 695
 696 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 697                                          const struct sk_buff *skb)
 698 {
 699         const struct nci_conn_info *conn_info;
 700         const struct nci_rf_deactivate_ntf *ntf = (void *)skb->data;
 701
 702         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 703
 704         conn_info = ndev->rf_conn_info;
 705         if (!conn_info)
 706                 return;
 707
 708         /* drop tx data queue */
 709         skb_queue_purge(&ndev->tx_q);
 710
 711         /* drop partial rx data packet */
 712         if (ndev->rx_data_reassembly) {
 713                 kfree_skb(ndev->rx_data_reassembly);
 714                 ndev->rx_data_reassembly = NULL;
 715         }
 716
 717         /* complete the data exchange transaction, if exists */
 718         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 719                 nci_data_exchange_complete(ndev, NULL, NCI_STATIC_RF_CONN_ID,
 720                                            -EIO);
 721
 722         switch (ntf->type) {
 723         case NCI_DEACTIVATE_TYPE_IDLE_MODE:
 724                 nci_clear_target_list(ndev);
 725                 atomic_set(&ndev->state, NCI_IDLE);
 726                 break;
 727         case NCI_DEACTIVATE_TYPE_SLEEP_MODE:
 728         case NCI_DEACTIVATE_TYPE_SLEEP_AF_MODE:
 729                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 730                 break;
 731         case NCI_DEACTIVATE_TYPE_DISCOVERY:
 732                 nci_clear_target_list(ndev);
 733                 atomic_set(&ndev->state, NCI_DISCOVERY);
 734                 break;
 735         }
 736
 737         nci_req_complete(ndev, NCI_STATUS_OK);
 738 }
 739
 740 static void nci_nfcee_discover_ntf_packet(struct nci_dev *ndev,
 741                                           const struct sk_buff *skb)
 742 {
 743         u8 status = NCI_STATUS_OK;
 744         const struct nci_nfcee_discover_ntf *nfcee_ntf =
 745                                 (struct nci_nfcee_discover_ntf *)skb->data;
 746
 747         /* NFCForum NCI 9.2.1 HCI Network Specific Handling
 748          * If the NFCC supports the HCI Network, it SHALL return one,
 749          * and only one, NFCEE_DISCOVER_NTF with a Protocol type of
 750          * “HCI Access”, even if the HCI Network contains multiple NFCEEs.
 751          */
 752         ndev->hci_dev->nfcee_id = nfcee_ntf->nfcee_id;
 753         ndev->cur_params.id = nfcee_ntf->nfcee_id;
 754
 755         nci_req_complete(ndev, status);
 756 }
 757
 758 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 759 {
 760         __u16 ntf_opcode = nci_opcode(skb->data);
 761
 762         pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 763                  nci_pbf(skb->data),
 764                  nci_opcode_gid(ntf_opcode),
 765                  nci_opcode_oid(ntf_opcode),
 766                  nci_plen(skb->data));
 767
 768         /* strip the nci control header */
 769         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 770
 771         if (nci_opcode_gid(ntf_opcode) == NCI_GID_PROPRIETARY) {
 772                 if (nci_prop_ntf_packet(ndev, ntf_opcode, skb) == -ENOTSUPP) {
 773                         pr_err("unsupported ntf opcode 0x%x\n",
 774                                ntf_opcode);
 775                 }
 776
 777                 goto end;
 778         }
 779
 780         switch (ntf_opcode) {
 781         case NCI_OP_CORE_RESET_NTF:
 782                 nci_core_reset_ntf_packet(ndev, skb);
 783                 break;
 784
 785         case NCI_OP_CORE_CONN_CREDITS_NTF:
 786                 nci_core_conn_credits_ntf_packet(ndev, skb);
 787                 break;
 788
 789         case NCI_OP_CORE_GENERIC_ERROR_NTF:
 790                 nci_core_generic_error_ntf_packet(ndev, skb);
 791                 break;
 792
 793         case NCI_OP_CORE_INTF_ERROR_NTF:
 794                 nci_core_conn_intf_error_ntf_packet(ndev, skb);
 795                 break;
 796
 797         case NCI_OP_RF_DISCOVER_NTF:
 798                 nci_rf_discover_ntf_packet(ndev, skb);
 799                 break;
 800
 801         case NCI_OP_RF_INTF_ACTIVATED_NTF:
 802                 nci_rf_intf_activated_ntf_packet(ndev, skb);
 803                 break;
 804
 805         case NCI_OP_RF_DEACTIVATE_NTF:
 806                 nci_rf_deactivate_ntf_packet(ndev, skb);
 807                 break;
 808
 809         case NCI_OP_NFCEE_DISCOVER_NTF:
 810                 nci_nfcee_discover_ntf_packet(ndev, skb);
 811                 break;
 812
 813         case NCI_OP_RF_NFCEE_ACTION_NTF:
 814                 break;
 815
 816         default:
 817                 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
 818                 break;
 819         }
 820
 821         nci_core_ntf_packet(ndev, ntf_opcode, skb);
 822 end:
 823         kfree_skb(skb);
 824 }