net/nfc/nci/ntf.c

   1 /*
   2  *  The NFC Controller Interface is the communication protocol between an
   3  *  NFC Controller (NFCC) and a Device Host (DH).
   4  *
   5  *  Copyright (C) 2014 Marvell International Ltd.
   6  *  Copyright (C) 2011 Texas Instruments, Inc.
   7  *
   8  *  Written by Ilan Elias <ilane@ti.com>
   9  *
  10  *  Acknowledgements:
  11  *  This file is based on hci_event.c, which was written
  12  *  by Maxim Krasnyansky.
  13  *
  14  *  This program is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License version 2
  16  *  as published by the Free Software Foundation
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  25  *
  26  */
  27
  28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  29
  30 #include <linux/types.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/bitops.h>
  33 #include <linux/skbuff.h>
  34
  35 #include "../nfc.h"
  36 #include <net/nfc/nci.h>
  37 #include <net/nfc/nci_core.h>
  38 #include <linux/nfc.h>
  39
  40 /* Handle NCI Notification packets */
  41
  42 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
  43                                              struct sk_buff *skb)
  44 {
  45         struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
  46         int i;
  47
  48         pr_debug("num_entries %d\n", ntf->num_entries);
  49
  50         if (ntf->num_entries > NCI_MAX_NUM_CONN)
  51                 ntf->num_entries = NCI_MAX_NUM_CONN;
  52
  53         /* update the credits */
  54         for (i = 0; i < ntf->num_entries; i++) {
  55                 ntf->conn_entries[i].conn_id =
  56                         nci_conn_id(&ntf->conn_entries[i].conn_id);
  57
  58                 pr_debug("entry[%d]: conn_id %d, credits %d\n",
  59                          i, ntf->conn_entries[i].conn_id,
  60                          ntf->conn_entries[i].credits);
  61
  62                 if (ntf->conn_entries[i].conn_id == NCI_STATIC_RF_CONN_ID) {
  63                         /* found static rf connection */
  64                         atomic_add(ntf->conn_entries[i].credits,
  65                                    &ndev->credits_cnt);
  66                 }
  67         }
  68
  69         /* trigger the next tx */
  70         if (!skb_queue_empty(&ndev->tx_q))
  71                 queue_work(ndev->tx_wq, &ndev->tx_work);
  72 }
  73
  74 static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
  75                                               struct sk_buff *skb)
  76 {
  77         __u8 status = skb->data[0];
  78
  79         pr_debug("status 0x%x\n", status);
  80
  81         if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
  82                 /* Activation failed, so complete the request
  83                    (the state remains the same) */
  84                 nci_req_complete(ndev, status);
  85         }
  86 }
  87
  88 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
  89                                                 struct sk_buff *skb)
  90 {
  91         struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
  92
  93         ntf->conn_id = nci_conn_id(&ntf->conn_id);
  94
  95         pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
  96
  97         /* complete the data exchange transaction, if exists */
  98         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
  99                 nci_data_exchange_complete(ndev, NULL, -EIO);
 100 }
 101
 102 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
 103                         struct rf_tech_specific_params_nfca_poll *nfca_poll,
 104                                                      __u8 *data)
 105 {
 106         nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
 107         data += 2;
 108
 109         nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);
 110
 111         pr_debug("sens_res 0x%x, nfcid1_len %d\n",
 112                  nfca_poll->sens_res, nfca_poll->nfcid1_len);
 113
 114         memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
 115         data += nfca_poll->nfcid1_len;
 116
 117         nfca_poll->sel_res_len = *data++;
 118
 119         if (nfca_poll->sel_res_len != 0)
 120                 nfca_poll->sel_res = *data++;
 121
 122         pr_debug("sel_res_len %d, sel_res 0x%x\n",
 123                  nfca_poll->sel_res_len,
 124                  nfca_poll->sel_res);
 125
 126         return data;
 127 }
 128
 129 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
 130                         struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
 131                                                      __u8 *data)
 132 {
 133         nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
 134
 135         pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
 136
 137         memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
 138         data += nfcb_poll->sensb_res_len;
 139
 140         return data;
 141 }
 142
 143 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
 144                         struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
 145                                                      __u8 *data)
 146 {
 147         nfcf_poll->bit_rate = *data++;
 148         nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
 149
 150         pr_debug("bit_rate %d, sensf_res_len %d\n",
 151                  nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
 152
 153         memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
 154         data += nfcf_poll->sensf_res_len;
 155
 156         return data;
 157 }
 158
 159 static __u8 *nci_extract_rf_params_nfcv_passive_poll(struct nci_dev *ndev,
 160                         struct rf_tech_specific_params_nfcv_poll *nfcv_poll,
 161                                                      __u8 *data)
 162 {
 163         ++data;
 164         nfcv_poll->dsfid = *data++;
 165         memcpy(nfcv_poll->uid, data, NFC_ISO15693_UID_MAXSIZE);
 166         data += NFC_ISO15693_UID_MAXSIZE;
 167         return data;
 168 }
 169
 170 __u32 nci_get_prop_rf_protocol(struct nci_dev *ndev, __u8 rf_protocol)
 171 {
 172         if (ndev->ops->get_rfprotocol)
 173                 return ndev->ops->get_rfprotocol(ndev, rf_protocol);
 174         return 0;
 175 }
 176
 177 static int nci_add_new_protocol(struct nci_dev *ndev,
 178                                 struct nfc_target *target,
 179                                 __u8 rf_protocol,
 180                                 __u8 rf_tech_and_mode,
 181                                 void *params)
 182 {
 183         struct rf_tech_specific_params_nfca_poll *nfca_poll;
 184         struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
 185         struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
 186         struct rf_tech_specific_params_nfcv_poll *nfcv_poll;
 187         __u32 protocol;
 188
 189         if (rf_protocol == NCI_RF_PROTOCOL_T1T)
 190                 protocol = NFC_PROTO_JEWEL_MASK;
 191         else if (rf_protocol == NCI_RF_PROTOCOL_T2T)
 192                 protocol = NFC_PROTO_MIFARE_MASK;
 193         else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
 194                 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
 195                         protocol = NFC_PROTO_ISO14443_MASK;
 196                 else
 197                         protocol = NFC_PROTO_ISO14443_B_MASK;
 198         else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
 199                 protocol = NFC_PROTO_FELICA_MASK;
 200         else if (rf_protocol == NCI_RF_PROTOCOL_NFC_DEP)
 201                 protocol = NFC_PROTO_NFC_DEP_MASK;
 202         else if (rf_protocol == NCI_RF_PROTOCOL_T5T)
 203                 protocol = NFC_PROTO_ISO15693_MASK;
 204         else
 205                 protocol = nci_get_prop_rf_protocol(ndev, rf_protocol);
 206
 207         if (!(protocol & ndev->poll_prots)) {
 208                 pr_err("the target found does not have the desired protocol\n");
 209                 return -EPROTO;
 210         }
 211
 212         if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
 213                 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
 214
 215                 target->sens_res = nfca_poll->sens_res;
 216                 target->sel_res = nfca_poll->sel_res;
 217                 target->nfcid1_len = nfca_poll->nfcid1_len;
 218                 if (target->nfcid1_len > 0) {
 219                         memcpy(target->nfcid1, nfca_poll->nfcid1,
 220                                target->nfcid1_len);
 221                 }
 222         } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
 223                 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
 224
 225                 target->sensb_res_len = nfcb_poll->sensb_res_len;
 226                 if (target->sensb_res_len > 0) {
 227                         memcpy(target->sensb_res, nfcb_poll->sensb_res,
 228                                target->sensb_res_len);
 229                 }
 230         } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
 231                 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
 232
 233                 target->sensf_res_len = nfcf_poll->sensf_res_len;
 234                 if (target->sensf_res_len > 0) {
 235                         memcpy(target->sensf_res, nfcf_poll->sensf_res,
 236                                target->sensf_res_len);
 237                 }
 238         } else if (rf_tech_and_mode == NCI_NFC_V_PASSIVE_POLL_MODE) {
 239                 nfcv_poll = (struct rf_tech_specific_params_nfcv_poll *)params;
 240
 241                 target->is_iso15693 = 1;
 242                 target->iso15693_dsfid = nfcv_poll->dsfid;
 243                 memcpy(target->iso15693_uid, nfcv_poll->uid, NFC_ISO15693_UID_MAXSIZE);
 244         } else {
 245                 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
 246                 return -EPROTO;
 247         }
 248
 249         target->supported_protocols |= protocol;
 250
 251         pr_debug("protocol 0x%x\n", protocol);
 252
 253         return 0;
 254 }
 255
 256 static void nci_add_new_target(struct nci_dev *ndev,
 257                                struct nci_rf_discover_ntf *ntf)
 258 {
 259         struct nfc_target *target;
 260         int i, rc;
 261
 262         for (i = 0; i < ndev->n_targets; i++) {
 263                 target = &ndev->targets[i];
 264                 if (target->logical_idx == ntf->rf_discovery_id) {
 265                         /* This target already exists, add the new protocol */
 266                         nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 267                                              ntf->rf_tech_and_mode,
 268                                              &ntf->rf_tech_specific_params);
 269                         return;
 270                 }
 271         }
 272
 273         /* This is a new target, check if we've enough room */
 274         if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
 275                 pr_debug("not enough room, ignoring new target...\n");
 276                 return;
 277         }
 278
 279         target = &ndev->targets[ndev->n_targets];
 280
 281         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 282                                   ntf->rf_tech_and_mode,
 283                                   &ntf->rf_tech_specific_params);
 284         if (!rc) {
 285                 target->logical_idx = ntf->rf_discovery_id;
 286                 ndev->n_targets++;
 287
 288                 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
 289                          ndev->n_targets);
 290         }
 291 }
 292
 293 void nci_clear_target_list(struct nci_dev *ndev)
 294 {
 295         memset(ndev->targets, 0,
 296                (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
 297
 298         ndev->n_targets = 0;
 299 }
 300
 301 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
 302                                        struct sk_buff *skb)
 303 {
 304         struct nci_rf_discover_ntf ntf;
 305         __u8 *data = skb->data;
 306         bool add_target = true;
 307
 308         ntf.rf_discovery_id = *data++;
 309         ntf.rf_protocol = *data++;
 310         ntf.rf_tech_and_mode = *data++;
 311         ntf.rf_tech_specific_params_len = *data++;
 312
 313         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 314         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 315         pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
 316         pr_debug("rf_tech_specific_params_len %d\n",
 317                  ntf.rf_tech_specific_params_len);
 318
 319         if (ntf.rf_tech_specific_params_len > 0) {
 320                 switch (ntf.rf_tech_and_mode) {
 321                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 322                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 323                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 324                         break;
 325
 326                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 327                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 328                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 329                         break;
 330
 331                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 332                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 333                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 334                         break;
 335
 336                 case NCI_NFC_V_PASSIVE_POLL_MODE:
 337                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
 338                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
 339                         break;
 340
 341                 default:
 342                         pr_err("unsupported rf_tech_and_mode 0x%x\n",
 343                                ntf.rf_tech_and_mode);
 344                         data += ntf.rf_tech_specific_params_len;
 345                         add_target = false;
 346                 }
 347         }
 348
 349         ntf.ntf_type = *data++;
 350         pr_debug("ntf_type %d\n", ntf.ntf_type);
 351
 352         if (add_target == true)
 353                 nci_add_new_target(ndev, &ntf);
 354
 355         if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
 356                 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
 357         } else {
 358                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 359                 nfc_targets_found(ndev->nfc_dev, ndev->targets,
 360                                   ndev->n_targets);
 361         }
 362 }
 363
 364 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 365                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 366 {
 367         struct activation_params_nfca_poll_iso_dep *nfca_poll;
 368         struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
 369
 370         switch (ntf->activation_rf_tech_and_mode) {
 371         case NCI_NFC_A_PASSIVE_POLL_MODE:
 372                 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
 373                 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
 374                 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
 375                 if (nfca_poll->rats_res_len > 0) {
 376                         memcpy(nfca_poll->rats_res,
 377                                data, nfca_poll->rats_res_len);
 378                 }
 379                 break;
 380
 381         case NCI_NFC_B_PASSIVE_POLL_MODE:
 382                 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
 383                 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
 384                 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
 385                 if (nfcb_poll->attrib_res_len > 0) {
 386                         memcpy(nfcb_poll->attrib_res,
 387                                data, nfcb_poll->attrib_res_len);
 388                 }
 389                 break;
 390
 391         default:
 392                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 393                        ntf->activation_rf_tech_and_mode);
 394                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 395         }
 396
 397         return NCI_STATUS_OK;
 398 }
 399
 400 static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
 401                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 402 {
 403         struct activation_params_poll_nfc_dep *poll;
 404
 405         switch (ntf->activation_rf_tech_and_mode) {
 406         case NCI_NFC_A_PASSIVE_POLL_MODE:
 407         case NCI_NFC_F_PASSIVE_POLL_MODE:
 408                 poll = &ntf->activation_params.poll_nfc_dep;
 409                 poll->atr_res_len = min_t(__u8, *data++, 63);
 410                 pr_debug("atr_res_len %d\n", poll->atr_res_len);
 411                 if (poll->atr_res_len > 0)
 412                         memcpy(poll->atr_res, data, poll->atr_res_len);
 413                 break;
 414
 415         default:
 416                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 417                        ntf->activation_rf_tech_and_mode);
 418                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 419         }
 420
 421         return NCI_STATUS_OK;
 422 }
 423
 424 static void nci_target_auto_activated(struct nci_dev *ndev,
 425                                       struct nci_rf_intf_activated_ntf *ntf)
 426 {
 427         struct nfc_target *target;
 428         int rc;
 429
 430         target = &ndev->targets[ndev->n_targets];
 431
 432         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 433                                   ntf->activation_rf_tech_and_mode,
 434                                   &ntf->rf_tech_specific_params);
 435         if (rc)
 436                 return;
 437
 438         target->logical_idx = ntf->rf_discovery_id;
 439         ndev->n_targets++;
 440
 441         pr_debug("logical idx %d, n_targets %d\n",
 442                  target->logical_idx, ndev->n_targets);
 443
 444         nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
 445 }
 446
 447 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 448                                              struct sk_buff *skb)
 449 {
 450         struct nci_rf_intf_activated_ntf ntf;
 451         __u8 *data = skb->data;
 452         int err = NCI_STATUS_OK;
 453
 454         ntf.rf_discovery_id = *data++;
 455         ntf.rf_interface = *data++;
 456         ntf.rf_protocol = *data++;
 457         ntf.activation_rf_tech_and_mode = *data++;
 458         ntf.max_data_pkt_payload_size = *data++;
 459         ntf.initial_num_credits = *data++;
 460         ntf.rf_tech_specific_params_len = *data++;
 461
 462         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 463         pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
 464         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 465         pr_debug("activation_rf_tech_and_mode 0x%x\n",
 466                  ntf.activation_rf_tech_and_mode);
 467         pr_debug("max_data_pkt_payload_size 0x%x\n",
 468                  ntf.max_data_pkt_payload_size);
 469         pr_debug("initial_num_credits 0x%x\n",
 470                  ntf.initial_num_credits);
 471         pr_debug("rf_tech_specific_params_len %d\n",
 472                  ntf.rf_tech_specific_params_len);
 473
 474         if (ntf.rf_tech_specific_params_len > 0) {
 475                 switch (ntf.activation_rf_tech_and_mode) {
 476                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 477                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 478                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 479                         break;
 480
 481                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 482                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 483                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 484                         break;
 485
 486                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 487                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 488                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 489                         break;
 490
 491                 case NCI_NFC_V_PASSIVE_POLL_MODE:
 492                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
 493                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
 494                         break;
 495
 496                 default:
 497                         pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 498                                ntf.activation_rf_tech_and_mode);
 499                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 500                         goto exit;
 501                 }
 502         }
 503
 504         ntf.data_exch_rf_tech_and_mode = *data++;
 505         ntf.data_exch_tx_bit_rate = *data++;
 506         ntf.data_exch_rx_bit_rate = *data++;
 507         ntf.activation_params_len = *data++;
 508
 509         pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
 510                  ntf.data_exch_rf_tech_and_mode);
 511         pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
 512         pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
 513         pr_debug("activation_params_len %d\n", ntf.activation_params_len);
 514
 515         if (ntf.activation_params_len > 0) {
 516                 switch (ntf.rf_interface) {
 517                 case NCI_RF_INTERFACE_ISO_DEP:
 518                         err = nci_extract_activation_params_iso_dep(ndev,
 519                                                                     &ntf, data);
 520                         break;
 521
 522                 case NCI_RF_INTERFACE_NFC_DEP:
 523                         err = nci_extract_activation_params_nfc_dep(ndev,
 524                                                                     &ntf, data);
 525                         break;
 526
 527                 case NCI_RF_INTERFACE_FRAME:
 528                         /* no activation params */
 529                         break;
 530
 531                 default:
 532                         pr_err("unsupported rf_interface 0x%x\n",
 533                                ntf.rf_interface);
 534                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 535                         break;
 536                 }
 537         }
 538
 539 exit:
 540         if (err == NCI_STATUS_OK) {
 541                 ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size;
 542                 ndev->initial_num_credits = ntf.initial_num_credits;
 543
 544                 /* set the available credits to initial value */
 545                 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
 546
 547                 /* store general bytes to be reported later in dep_link_up */
 548                 if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
 549                         ndev->remote_gb_len = 0;
 550
 551                         if (ntf.activation_params_len > 0) {
 552                                 /* ATR_RES general bytes at offset 15 */
 553                                 ndev->remote_gb_len = min_t(__u8,
 554                                         (ntf.activation_params
 555                                         .poll_nfc_dep.atr_res_len
 556                                         - NFC_ATR_RES_GT_OFFSET),
 557                                         NFC_MAX_GT_LEN);
 558                                 memcpy(ndev->remote_gb,
 559                                        (ntf.activation_params.poll_nfc_dep
 560                                        .atr_res + NFC_ATR_RES_GT_OFFSET),
 561                                        ndev->remote_gb_len);
 562                         }
 563                 }
 564         }
 565
 566         if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
 567                 /* A single target was found and activated automatically */
 568                 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 569                 if (err == NCI_STATUS_OK)
 570                         nci_target_auto_activated(ndev, &ntf);
 571         } else {        /* ndev->state == NCI_W4_HOST_SELECT */
 572                 /* A selected target was activated, so complete the request */
 573                 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 574                 nci_req_complete(ndev, err);
 575         }
 576 }
 577
 578 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 579                                          struct sk_buff *skb)
 580 {
 581         struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
 582
 583         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 584
 585         /* drop tx data queue */
 586         skb_queue_purge(&ndev->tx_q);
 587
 588         /* drop partial rx data packet */
 589         if (ndev->rx_data_reassembly) {
 590                 kfree_skb(ndev->rx_data_reassembly);
 591                 ndev->rx_data_reassembly = NULL;
 592         }
 593
 594         /* complete the data exchange transaction, if exists */
 595         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 596                 nci_data_exchange_complete(ndev, NULL, -EIO);
 597
 598         nci_clear_target_list(ndev);
 599         atomic_set(&ndev->state, NCI_IDLE);
 600         nci_req_complete(ndev, NCI_STATUS_OK);
 601 }
 602
 603 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 604 {
 605         __u16 ntf_opcode = nci_opcode(skb->data);
 606
 607         pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 608                  nci_pbf(skb->data),
 609                  nci_opcode_gid(ntf_opcode),
 610                  nci_opcode_oid(ntf_opcode),
 611                  nci_plen(skb->data));
 612
 613         /* strip the nci control header */
 614         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 615
 616         switch (ntf_opcode) {
 617         case NCI_OP_CORE_CONN_CREDITS_NTF:
 618                 nci_core_conn_credits_ntf_packet(ndev, skb);
 619                 break;
 620
 621         case NCI_OP_CORE_GENERIC_ERROR_NTF:
 622                 nci_core_generic_error_ntf_packet(ndev, skb);
 623                 break;
 624
 625         case NCI_OP_CORE_INTF_ERROR_NTF:
 626                 nci_core_conn_intf_error_ntf_packet(ndev, skb);
 627                 break;
 628
 629         case NCI_OP_RF_DISCOVER_NTF:
 630                 nci_rf_discover_ntf_packet(ndev, skb);
 631                 break;
 632
 633         case NCI_OP_RF_INTF_ACTIVATED_NTF:
 634                 nci_rf_intf_activated_ntf_packet(ndev, skb);
 635                 break;
 636
 637         case NCI_OP_RF_DEACTIVATE_NTF:
 638                 nci_rf_deactivate_ntf_packet(ndev, skb);
 639                 break;
 640
 641         default:
 642                 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
 643                 break;
 644         }
 645
 646         kfree_skb(skb);
 647 }