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(*((__le16 *)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 static __u8 *nci_extract_rf_params_nfcf_passive_listen(struct nci_dev *ndev,
 171                         struct rf_tech_specific_params_nfcf_listen *nfcf_listen,
 172                                                      __u8 *data)
 173 {
 174         nfcf_listen->local_nfcid2_len = min_t(__u8, *data++,
 175                                               NFC_NFCID2_MAXSIZE);
 176         memcpy(nfcf_listen->local_nfcid2, data, nfcf_listen->local_nfcid2_len);
 177         data += nfcf_listen->local_nfcid2_len;
 178
 179         return data;
 180 }
 181
 182 static __u32 nci_get_prop_rf_protocol(struct nci_dev *ndev, __u8 rf_protocol)
 183 {
 184         if (ndev->ops->get_rfprotocol)
 185                 return ndev->ops->get_rfprotocol(ndev, rf_protocol);
 186         return 0;
 187 }
 188
 189 static int nci_add_new_protocol(struct nci_dev *ndev,
 190                                 struct nfc_target *target,
 191                                 __u8 rf_protocol,
 192                                 __u8 rf_tech_and_mode,
 193                                 void *params)
 194 {
 195         struct rf_tech_specific_params_nfca_poll *nfca_poll;
 196         struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
 197         struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
 198         struct rf_tech_specific_params_nfcv_poll *nfcv_poll;
 199         __u32 protocol;
 200
 201         if (rf_protocol == NCI_RF_PROTOCOL_T1T)
 202                 protocol = NFC_PROTO_JEWEL_MASK;
 203         else if (rf_protocol == NCI_RF_PROTOCOL_T2T)
 204                 protocol = NFC_PROTO_MIFARE_MASK;
 205         else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
 206                 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
 207                         protocol = NFC_PROTO_ISO14443_MASK;
 208                 else
 209                         protocol = NFC_PROTO_ISO14443_B_MASK;
 210         else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
 211                 protocol = NFC_PROTO_FELICA_MASK;
 212         else if (rf_protocol == NCI_RF_PROTOCOL_NFC_DEP)
 213                 protocol = NFC_PROTO_NFC_DEP_MASK;
 214         else if (rf_protocol == NCI_RF_PROTOCOL_T5T)
 215                 protocol = NFC_PROTO_ISO15693_MASK;
 216         else
 217                 protocol = nci_get_prop_rf_protocol(ndev, rf_protocol);
 218
 219         if (!(protocol & ndev->poll_prots)) {
 220                 pr_err("the target found does not have the desired protocol\n");
 221                 return -EPROTO;
 222         }
 223
 224         if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
 225                 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
 226
 227                 target->sens_res = nfca_poll->sens_res;
 228                 target->sel_res = nfca_poll->sel_res;
 229                 target->nfcid1_len = nfca_poll->nfcid1_len;
 230                 if (target->nfcid1_len > 0) {
 231                         memcpy(target->nfcid1, nfca_poll->nfcid1,
 232                                target->nfcid1_len);
 233                 }
 234         } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
 235                 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
 236
 237                 target->sensb_res_len = nfcb_poll->sensb_res_len;
 238                 if (target->sensb_res_len > 0) {
 239                         memcpy(target->sensb_res, nfcb_poll->sensb_res,
 240                                target->sensb_res_len);
 241                 }
 242         } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
 243                 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
 244
 245                 target->sensf_res_len = nfcf_poll->sensf_res_len;
 246                 if (target->sensf_res_len > 0) {
 247                         memcpy(target->sensf_res, nfcf_poll->sensf_res,
 248                                target->sensf_res_len);
 249                 }
 250         } else if (rf_tech_and_mode == NCI_NFC_V_PASSIVE_POLL_MODE) {
 251                 nfcv_poll = (struct rf_tech_specific_params_nfcv_poll *)params;
 252
 253                 target->is_iso15693 = 1;
 254                 target->iso15693_dsfid = nfcv_poll->dsfid;
 255                 memcpy(target->iso15693_uid, nfcv_poll->uid, NFC_ISO15693_UID_MAXSIZE);
 256         } else {
 257                 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
 258                 return -EPROTO;
 259         }
 260
 261         target->supported_protocols |= protocol;
 262
 263         pr_debug("protocol 0x%x\n", protocol);
 264
 265         return 0;
 266 }
 267
 268 static void nci_add_new_target(struct nci_dev *ndev,
 269                                struct nci_rf_discover_ntf *ntf)
 270 {
 271         struct nfc_target *target;
 272         int i, rc;
 273
 274         for (i = 0; i < ndev->n_targets; i++) {
 275                 target = &ndev->targets[i];
 276                 if (target->logical_idx == ntf->rf_discovery_id) {
 277                         /* This target already exists, add the new protocol */
 278                         nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 279                                              ntf->rf_tech_and_mode,
 280                                              &ntf->rf_tech_specific_params);
 281                         return;
 282                 }
 283         }
 284
 285         /* This is a new target, check if we've enough room */
 286         if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
 287                 pr_debug("not enough room, ignoring new target...\n");
 288                 return;
 289         }
 290
 291         target = &ndev->targets[ndev->n_targets];
 292
 293         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 294                                   ntf->rf_tech_and_mode,
 295                                   &ntf->rf_tech_specific_params);
 296         if (!rc) {
 297                 target->logical_idx = ntf->rf_discovery_id;
 298                 ndev->n_targets++;
 299
 300                 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
 301                          ndev->n_targets);
 302         }
 303 }
 304
 305 void nci_clear_target_list(struct nci_dev *ndev)
 306 {
 307         memset(ndev->targets, 0,
 308                (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
 309
 310         ndev->n_targets = 0;
 311 }
 312
 313 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
 314                                        struct sk_buff *skb)
 315 {
 316         struct nci_rf_discover_ntf ntf;
 317         __u8 *data = skb->data;
 318         bool add_target = true;
 319
 320         ntf.rf_discovery_id = *data++;
 321         ntf.rf_protocol = *data++;
 322         ntf.rf_tech_and_mode = *data++;
 323         ntf.rf_tech_specific_params_len = *data++;
 324
 325         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 326         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 327         pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
 328         pr_debug("rf_tech_specific_params_len %d\n",
 329                  ntf.rf_tech_specific_params_len);
 330
 331         if (ntf.rf_tech_specific_params_len > 0) {
 332                 switch (ntf.rf_tech_and_mode) {
 333                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 334                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 335                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 336                         break;
 337
 338                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 339                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 340                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 341                         break;
 342
 343                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 344                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 345                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 346                         break;
 347
 348                 case NCI_NFC_V_PASSIVE_POLL_MODE:
 349                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
 350                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
 351                         break;
 352
 353                 default:
 354                         pr_err("unsupported rf_tech_and_mode 0x%x\n",
 355                                ntf.rf_tech_and_mode);
 356                         data += ntf.rf_tech_specific_params_len;
 357                         add_target = false;
 358                 }
 359         }
 360
 361         ntf.ntf_type = *data++;
 362         pr_debug("ntf_type %d\n", ntf.ntf_type);
 363
 364         if (add_target == true)
 365                 nci_add_new_target(ndev, &ntf);
 366
 367         if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
 368                 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
 369         } else {
 370                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 371                 nfc_targets_found(ndev->nfc_dev, ndev->targets,
 372                                   ndev->n_targets);
 373         }
 374 }
 375
 376 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 377                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 378 {
 379         struct activation_params_nfca_poll_iso_dep *nfca_poll;
 380         struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
 381
 382         switch (ntf->activation_rf_tech_and_mode) {
 383         case NCI_NFC_A_PASSIVE_POLL_MODE:
 384                 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
 385                 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
 386                 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
 387                 if (nfca_poll->rats_res_len > 0) {
 388                         memcpy(nfca_poll->rats_res,
 389                                data, nfca_poll->rats_res_len);
 390                 }
 391                 break;
 392
 393         case NCI_NFC_B_PASSIVE_POLL_MODE:
 394                 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
 395                 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
 396                 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
 397                 if (nfcb_poll->attrib_res_len > 0) {
 398                         memcpy(nfcb_poll->attrib_res,
 399                                data, nfcb_poll->attrib_res_len);
 400                 }
 401                 break;
 402
 403         default:
 404                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 405                        ntf->activation_rf_tech_and_mode);
 406                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 407         }
 408
 409         return NCI_STATUS_OK;
 410 }
 411
 412 static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
 413                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 414 {
 415         struct activation_params_poll_nfc_dep *poll;
 416         struct activation_params_listen_nfc_dep *listen;
 417
 418         switch (ntf->activation_rf_tech_and_mode) {
 419         case NCI_NFC_A_PASSIVE_POLL_MODE:
 420         case NCI_NFC_F_PASSIVE_POLL_MODE:
 421                 poll = &ntf->activation_params.poll_nfc_dep;
 422                 poll->atr_res_len = min_t(__u8, *data++,
 423                                           NFC_ATR_RES_MAXSIZE - 2);
 424                 pr_debug("atr_res_len %d\n", poll->atr_res_len);
 425                 if (poll->atr_res_len > 0)
 426                         memcpy(poll->atr_res, data, poll->atr_res_len);
 427                 break;
 428
 429         case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 430         case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 431                 listen = &ntf->activation_params.listen_nfc_dep;
 432                 listen->atr_req_len = min_t(__u8, *data++,
 433                                             NFC_ATR_REQ_MAXSIZE - 2);
 434                 pr_debug("atr_req_len %d\n", listen->atr_req_len);
 435                 if (listen->atr_req_len > 0)
 436                         memcpy(listen->atr_req, data, listen->atr_req_len);
 437                 break;
 438
 439         default:
 440                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 441                        ntf->activation_rf_tech_and_mode);
 442                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 443         }
 444
 445         return NCI_STATUS_OK;
 446 }
 447
 448 static void nci_target_auto_activated(struct nci_dev *ndev,
 449                                       struct nci_rf_intf_activated_ntf *ntf)
 450 {
 451         struct nfc_target *target;
 452         int rc;
 453
 454         target = &ndev->targets[ndev->n_targets];
 455
 456         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 457                                   ntf->activation_rf_tech_and_mode,
 458                                   &ntf->rf_tech_specific_params);
 459         if (rc)
 460                 return;
 461
 462         target->logical_idx = ntf->rf_discovery_id;
 463         ndev->n_targets++;
 464
 465         pr_debug("logical idx %d, n_targets %d\n",
 466                  target->logical_idx, ndev->n_targets);
 467
 468         nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
 469 }
 470
 471 static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
 472                 struct nci_rf_intf_activated_ntf *ntf)
 473 {
 474         ndev->remote_gb_len = 0;
 475
 476         if (ntf->activation_params_len <= 0)
 477                 return NCI_STATUS_OK;
 478
 479         switch (ntf->activation_rf_tech_and_mode) {
 480         case NCI_NFC_A_PASSIVE_POLL_MODE:
 481         case NCI_NFC_F_PASSIVE_POLL_MODE:
 482                 ndev->remote_gb_len = min_t(__u8,
 483                         (ntf->activation_params.poll_nfc_dep.atr_res_len
 484                                                 - NFC_ATR_RES_GT_OFFSET),
 485                         NFC_ATR_RES_GB_MAXSIZE);
 486                 memcpy(ndev->remote_gb,
 487                        (ntf->activation_params.poll_nfc_dep.atr_res
 488                                                 + NFC_ATR_RES_GT_OFFSET),
 489                        ndev->remote_gb_len);
 490                 break;
 491
 492         case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 493         case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 494                 ndev->remote_gb_len = min_t(__u8,
 495                         (ntf->activation_params.listen_nfc_dep.atr_req_len
 496                                                 - NFC_ATR_REQ_GT_OFFSET),
 497                         NFC_ATR_REQ_GB_MAXSIZE);
 498                 memcpy(ndev->remote_gb,
 499                        (ntf->activation_params.listen_nfc_dep.atr_req
 500                                                 + NFC_ATR_REQ_GT_OFFSET),
 501                        ndev->remote_gb_len);
 502                 break;
 503
 504         default:
 505                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 506                        ntf->activation_rf_tech_and_mode);
 507                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 508         }
 509
 510         return NCI_STATUS_OK;
 511 }
 512
 513 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 514                                              struct sk_buff *skb)
 515 {
 516         struct nci_rf_intf_activated_ntf ntf;
 517         __u8 *data = skb->data;
 518         int err = NCI_STATUS_OK;
 519
 520         ntf.rf_discovery_id = *data++;
 521         ntf.rf_interface = *data++;
 522         ntf.rf_protocol = *data++;
 523         ntf.activation_rf_tech_and_mode = *data++;
 524         ntf.max_data_pkt_payload_size = *data++;
 525         ntf.initial_num_credits = *data++;
 526         ntf.rf_tech_specific_params_len = *data++;
 527
 528         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 529         pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
 530         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 531         pr_debug("activation_rf_tech_and_mode 0x%x\n",
 532                  ntf.activation_rf_tech_and_mode);
 533         pr_debug("max_data_pkt_payload_size 0x%x\n",
 534                  ntf.max_data_pkt_payload_size);
 535         pr_debug("initial_num_credits 0x%x\n",
 536                  ntf.initial_num_credits);
 537         pr_debug("rf_tech_specific_params_len %d\n",
 538                  ntf.rf_tech_specific_params_len);
 539
 540         if (ntf.rf_tech_specific_params_len > 0) {
 541                 switch (ntf.activation_rf_tech_and_mode) {
 542                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 543                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 544                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 545                         break;
 546
 547                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 548                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 549                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 550                         break;
 551
 552                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 553                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 554                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 555                         break;
 556
 557                 case NCI_NFC_V_PASSIVE_POLL_MODE:
 558                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
 559                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
 560                         break;
 561
 562                 case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 563                         /* no RF technology specific parameters */
 564                         break;
 565
 566                 case NCI_NFC_F_PASSIVE_LISTEN_MODE:
 567                         data = nci_extract_rf_params_nfcf_passive_listen(ndev,
 568                                 &(ntf.rf_tech_specific_params.nfcf_listen),
 569                                 data);
 570                         break;
 571
 572                 default:
 573                         pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 574                                ntf.activation_rf_tech_and_mode);
 575                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 576                         goto exit;
 577                 }
 578         }
 579
 580         ntf.data_exch_rf_tech_and_mode = *data++;
 581         ntf.data_exch_tx_bit_rate = *data++;
 582         ntf.data_exch_rx_bit_rate = *data++;
 583         ntf.activation_params_len = *data++;
 584
 585         pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
 586                  ntf.data_exch_rf_tech_and_mode);
 587         pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
 588         pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
 589         pr_debug("activation_params_len %d\n", ntf.activation_params_len);
 590
 591         if (ntf.activation_params_len > 0) {
 592                 switch (ntf.rf_interface) {
 593                 case NCI_RF_INTERFACE_ISO_DEP:
 594                         err = nci_extract_activation_params_iso_dep(ndev,
 595                                                                     &ntf, data);
 596                         break;
 597
 598                 case NCI_RF_INTERFACE_NFC_DEP:
 599                         err = nci_extract_activation_params_nfc_dep(ndev,
 600                                                                     &ntf, data);
 601                         break;
 602
 603                 case NCI_RF_INTERFACE_FRAME:
 604                         /* no activation params */
 605                         break;
 606
 607                 default:
 608                         pr_err("unsupported rf_interface 0x%x\n",
 609                                ntf.rf_interface);
 610                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 611                         break;
 612                 }
 613         }
 614
 615 exit:
 616         if (err == NCI_STATUS_OK) {
 617                 ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size;
 618                 ndev->initial_num_credits = ntf.initial_num_credits;
 619
 620                 /* set the available credits to initial value */
 621                 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
 622
 623                 /* store general bytes to be reported later in dep_link_up */
 624                 if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
 625                         err = nci_store_general_bytes_nfc_dep(ndev, &ntf);
 626                         if (err != NCI_STATUS_OK)
 627                                 pr_err("unable to store general bytes\n");
 628                 }
 629         }
 630
 631         if (!(ntf.activation_rf_tech_and_mode & NCI_RF_TECH_MODE_LISTEN_MASK)) {
 632                 /* Poll mode */
 633                 if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
 634                         /* A single target was found and activated
 635                          * automatically */
 636                         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 637                         if (err == NCI_STATUS_OK)
 638                                 nci_target_auto_activated(ndev, &ntf);
 639                 } else {        /* ndev->state == NCI_W4_HOST_SELECT */
 640                         /* A selected target was activated, so complete the
 641                          * request */
 642                         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 643                         nci_req_complete(ndev, err);
 644                 }
 645         } else {
 646                 /* Listen mode */
 647                 atomic_set(&ndev->state, NCI_LISTEN_ACTIVE);
 648                 if (err == NCI_STATUS_OK &&
 649                     ntf.rf_protocol == NCI_RF_PROTOCOL_NFC_DEP) {
 650                         err = nfc_tm_activated(ndev->nfc_dev,
 651                                                NFC_PROTO_NFC_DEP_MASK,
 652                                                NFC_COMM_PASSIVE,
 653                                                ndev->remote_gb,
 654                                                ndev->remote_gb_len);
 655                         if (err != NCI_STATUS_OK)
 656                                 pr_err("error when signaling tm activation\n");
 657                 }
 658         }
 659 }
 660
 661 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 662                                          struct sk_buff *skb)
 663 {
 664         struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
 665
 666         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 667
 668         /* drop tx data queue */
 669         skb_queue_purge(&ndev->tx_q);
 670
 671         /* drop partial rx data packet */
 672         if (ndev->rx_data_reassembly) {
 673                 kfree_skb(ndev->rx_data_reassembly);
 674                 ndev->rx_data_reassembly = NULL;
 675         }
 676
 677         /* complete the data exchange transaction, if exists */
 678         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 679                 nci_data_exchange_complete(ndev, NULL, -EIO);
 680
 681         switch (ntf->type) {
 682         case NCI_DEACTIVATE_TYPE_IDLE_MODE:
 683                 nci_clear_target_list(ndev);
 684                 atomic_set(&ndev->state, NCI_IDLE);
 685                 break;
 686         case NCI_DEACTIVATE_TYPE_SLEEP_MODE:
 687         case NCI_DEACTIVATE_TYPE_SLEEP_AF_MODE:
 688                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 689                 break;
 690         case NCI_DEACTIVATE_TYPE_DISCOVERY:
 691                 nci_clear_target_list(ndev);
 692                 atomic_set(&ndev->state, NCI_DISCOVERY);
 693                 break;
 694         }
 695
 696         nci_req_complete(ndev, NCI_STATUS_OK);
 697 }
 698
 699 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 700 {
 701         __u16 ntf_opcode = nci_opcode(skb->data);
 702
 703         pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 704                  nci_pbf(skb->data),
 705                  nci_opcode_gid(ntf_opcode),
 706                  nci_opcode_oid(ntf_opcode),
 707                  nci_plen(skb->data));
 708
 709         /* strip the nci control header */
 710         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 711
 712         switch (ntf_opcode) {
 713         case NCI_OP_CORE_CONN_CREDITS_NTF:
 714                 nci_core_conn_credits_ntf_packet(ndev, skb);
 715                 break;
 716
 717         case NCI_OP_CORE_GENERIC_ERROR_NTF:
 718                 nci_core_generic_error_ntf_packet(ndev, skb);
 719                 break;
 720
 721         case NCI_OP_CORE_INTF_ERROR_NTF:
 722                 nci_core_conn_intf_error_ntf_packet(ndev, skb);
 723                 break;
 724
 725         case NCI_OP_RF_DISCOVER_NTF:
 726                 nci_rf_discover_ntf_packet(ndev, skb);
 727                 break;
 728
 729         case NCI_OP_RF_INTF_ACTIVATED_NTF:
 730                 nci_rf_intf_activated_ntf_packet(ndev, skb);
 731                 break;
 732
 733         case NCI_OP_RF_DEACTIVATE_NTF:
 734                 nci_rf_deactivate_ntf_packet(ndev, skb);
 735                 break;
 736
 737         default:
 738                 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
 739                 break;
 740         }
 741
 742         kfree_skb(skb);
 743 }