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) 2011 Texas Instruments, Inc.
   6  *
   7  *  Written by Ilan Elias <ilane@ti.com>
   8  *
   9  *  Acknowledgements:
  10  *  This file is based on hci_event.c, which was written
  11  *  by Maxim Krasnyansky.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License version 2
  15  *  as published by the Free Software Foundation
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  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 = *data++;
 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 = *data++;
 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 = *data++;
 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 int nci_add_new_protocol(struct nci_dev *ndev,
 160                                 struct nfc_target *target,
 161                                 __u8 rf_protocol,
 162                                 __u8 rf_tech_and_mode,
 163                                 void *params)
 164 {
 165         struct rf_tech_specific_params_nfca_poll *nfca_poll;
 166         struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
 167         struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
 168         __u32 protocol;
 169
 170         if (rf_protocol == NCI_RF_PROTOCOL_T2T)
 171                 protocol = NFC_PROTO_MIFARE_MASK;
 172         else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
 173                 protocol = NFC_PROTO_ISO14443_MASK;
 174         else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
 175                 protocol = NFC_PROTO_FELICA_MASK;
 176         else
 177                 protocol = 0;
 178
 179         if (!(protocol & ndev->poll_prots)) {
 180                 pr_err("the target found does not have the desired protocol\n");
 181                 return -EPROTO;
 182         }
 183
 184         if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
 185                 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
 186
 187                 target->sens_res = nfca_poll->sens_res;
 188                 target->sel_res = nfca_poll->sel_res;
 189                 target->nfcid1_len = nfca_poll->nfcid1_len;
 190                 if (target->nfcid1_len > 0) {
 191                         memcpy(target->nfcid1, nfca_poll->nfcid1,
 192                                target->nfcid1_len);
 193                 }
 194         } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
 195                 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
 196
 197                 target->sensb_res_len = nfcb_poll->sensb_res_len;
 198                 if (target->sensb_res_len > 0) {
 199                         memcpy(target->sensb_res, nfcb_poll->sensb_res,
 200                                target->sensb_res_len);
 201                 }
 202         } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
 203                 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
 204
 205                 target->sensf_res_len = nfcf_poll->sensf_res_len;
 206                 if (target->sensf_res_len > 0) {
 207                         memcpy(target->sensf_res, nfcf_poll->sensf_res,
 208                                target->sensf_res_len);
 209                 }
 210         } else {
 211                 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
 212                 return -EPROTO;
 213         }
 214
 215         target->supported_protocols |= protocol;
 216
 217         pr_debug("protocol 0x%x\n", protocol);
 218
 219         return 0;
 220 }
 221
 222 static void nci_add_new_target(struct nci_dev *ndev,
 223                                struct nci_rf_discover_ntf *ntf)
 224 {
 225         struct nfc_target *target;
 226         int i, rc;
 227
 228         for (i = 0; i < ndev->n_targets; i++) {
 229                 target = &ndev->targets[i];
 230                 if (target->logical_idx == ntf->rf_discovery_id) {
 231                         /* This target already exists, add the new protocol */
 232                         nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 233                                              ntf->rf_tech_and_mode,
 234                                              &ntf->rf_tech_specific_params);
 235                         return;
 236                 }
 237         }
 238
 239         /* This is a new target, check if we've enough room */
 240         if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
 241                 pr_debug("not enough room, ignoring new target...\n");
 242                 return;
 243         }
 244
 245         target = &ndev->targets[ndev->n_targets];
 246
 247         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 248                                   ntf->rf_tech_and_mode,
 249                                   &ntf->rf_tech_specific_params);
 250         if (!rc) {
 251                 target->logical_idx = ntf->rf_discovery_id;
 252                 ndev->n_targets++;
 253
 254                 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
 255                          ndev->n_targets);
 256         }
 257 }
 258
 259 void nci_clear_target_list(struct nci_dev *ndev)
 260 {
 261         memset(ndev->targets, 0,
 262                (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
 263
 264         ndev->n_targets = 0;
 265 }
 266
 267 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
 268                                        struct sk_buff *skb)
 269 {
 270         struct nci_rf_discover_ntf ntf;
 271         __u8 *data = skb->data;
 272         bool add_target = true;
 273
 274         ntf.rf_discovery_id = *data++;
 275         ntf.rf_protocol = *data++;
 276         ntf.rf_tech_and_mode = *data++;
 277         ntf.rf_tech_specific_params_len = *data++;
 278
 279         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 280         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 281         pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
 282         pr_debug("rf_tech_specific_params_len %d\n",
 283                  ntf.rf_tech_specific_params_len);
 284
 285         if (ntf.rf_tech_specific_params_len > 0) {
 286                 switch (ntf.rf_tech_and_mode) {
 287                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 288                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 289                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 290                         break;
 291
 292                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 293                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 294                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 295                         break;
 296
 297                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 298                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 299                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 300                         break;
 301
 302                 default:
 303                         pr_err("unsupported rf_tech_and_mode 0x%x\n",
 304                                ntf.rf_tech_and_mode);
 305                         data += ntf.rf_tech_specific_params_len;
 306                         add_target = false;
 307                 }
 308         }
 309
 310         ntf.ntf_type = *data++;
 311         pr_debug("ntf_type %d\n", ntf.ntf_type);
 312
 313         if (add_target == true)
 314                 nci_add_new_target(ndev, &ntf);
 315
 316         if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
 317                 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
 318         } else {
 319                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 320                 nfc_targets_found(ndev->nfc_dev, ndev->targets,
 321                                   ndev->n_targets);
 322         }
 323 }
 324
 325 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 326                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 327 {
 328         struct activation_params_nfca_poll_iso_dep *nfca_poll;
 329         struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
 330
 331         switch (ntf->activation_rf_tech_and_mode) {
 332         case NCI_NFC_A_PASSIVE_POLL_MODE:
 333                 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
 334                 nfca_poll->rats_res_len = *data++;
 335                 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
 336                 if (nfca_poll->rats_res_len > 0) {
 337                         memcpy(nfca_poll->rats_res,
 338                                data, nfca_poll->rats_res_len);
 339                 }
 340                 break;
 341
 342         case NCI_NFC_B_PASSIVE_POLL_MODE:
 343                 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
 344                 nfcb_poll->attrib_res_len = *data++;
 345                 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
 346                 if (nfcb_poll->attrib_res_len > 0) {
 347                         memcpy(nfcb_poll->attrib_res,
 348                                data, nfcb_poll->attrib_res_len);
 349                 }
 350                 break;
 351
 352         default:
 353                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 354                        ntf->activation_rf_tech_and_mode);
 355                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 356         }
 357
 358         return NCI_STATUS_OK;
 359 }
 360
 361 static void nci_target_auto_activated(struct nci_dev *ndev,
 362                                       struct nci_rf_intf_activated_ntf *ntf)
 363 {
 364         struct nfc_target *target;
 365         int rc;
 366
 367         target = &ndev->targets[ndev->n_targets];
 368
 369         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 370                                   ntf->activation_rf_tech_and_mode,
 371                                   &ntf->rf_tech_specific_params);
 372         if (rc)
 373                 return;
 374
 375         target->logical_idx = ntf->rf_discovery_id;
 376         ndev->n_targets++;
 377
 378         pr_debug("logical idx %d, n_targets %d\n",
 379                  target->logical_idx, ndev->n_targets);
 380
 381         nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
 382 }
 383
 384 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 385                                              struct sk_buff *skb)
 386 {
 387         struct nci_rf_intf_activated_ntf ntf;
 388         __u8 *data = skb->data;
 389         int err = NCI_STATUS_OK;
 390
 391         ntf.rf_discovery_id = *data++;
 392         ntf.rf_interface = *data++;
 393         ntf.rf_protocol = *data++;
 394         ntf.activation_rf_tech_and_mode = *data++;
 395         ntf.max_data_pkt_payload_size = *data++;
 396         ntf.initial_num_credits = *data++;
 397         ntf.rf_tech_specific_params_len = *data++;
 398
 399         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 400         pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
 401         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 402         pr_debug("activation_rf_tech_and_mode 0x%x\n",
 403                  ntf.activation_rf_tech_and_mode);
 404         pr_debug("max_data_pkt_payload_size 0x%x\n",
 405                  ntf.max_data_pkt_payload_size);
 406         pr_debug("initial_num_credits 0x%x\n",
 407                  ntf.initial_num_credits);
 408         pr_debug("rf_tech_specific_params_len %d\n",
 409                  ntf.rf_tech_specific_params_len);
 410
 411         if (ntf.rf_tech_specific_params_len > 0) {
 412                 switch (ntf.activation_rf_tech_and_mode) {
 413                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 414                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 415                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 416                         break;
 417
 418                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 419                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 420                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 421                         break;
 422
 423                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 424                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 425                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 426                         break;
 427
 428                 default:
 429                         pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 430                                ntf.activation_rf_tech_and_mode);
 431                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 432                         goto exit;
 433                 }
 434         }
 435
 436         ntf.data_exch_rf_tech_and_mode = *data++;
 437         ntf.data_exch_tx_bit_rate = *data++;
 438         ntf.data_exch_rx_bit_rate = *data++;
 439         ntf.activation_params_len = *data++;
 440
 441         pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
 442                  ntf.data_exch_rf_tech_and_mode);
 443         pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
 444         pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
 445         pr_debug("activation_params_len %d\n", ntf.activation_params_len);
 446
 447         if (ntf.activation_params_len > 0) {
 448                 switch (ntf.rf_interface) {
 449                 case NCI_RF_INTERFACE_ISO_DEP:
 450                         err = nci_extract_activation_params_iso_dep(ndev,
 451                                                                     &ntf, data);
 452                         break;
 453
 454                 case NCI_RF_INTERFACE_FRAME:
 455                         /* no activation params */
 456                         break;
 457
 458                 default:
 459                         pr_err("unsupported rf_interface 0x%x\n",
 460                                ntf.rf_interface);
 461                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 462                         break;
 463                 }
 464         }
 465
 466 exit:
 467         if (err == NCI_STATUS_OK) {
 468                 ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size;
 469                 ndev->initial_num_credits = ntf.initial_num_credits;
 470
 471                 /* set the available credits to initial value */
 472                 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
 473         }
 474
 475         if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
 476                 /* A single target was found and activated automatically */
 477                 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 478                 if (err == NCI_STATUS_OK)
 479                         nci_target_auto_activated(ndev, &ntf);
 480         } else {        /* ndev->state == NCI_W4_HOST_SELECT */
 481                 /* A selected target was activated, so complete the request */
 482                 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 483                 nci_req_complete(ndev, err);
 484         }
 485 }
 486
 487 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 488                                          struct sk_buff *skb)
 489 {
 490         struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
 491
 492         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 493
 494         /* drop tx data queue */
 495         skb_queue_purge(&ndev->tx_q);
 496
 497         /* drop partial rx data packet */
 498         if (ndev->rx_data_reassembly) {
 499                 kfree_skb(ndev->rx_data_reassembly);
 500                 ndev->rx_data_reassembly = NULL;
 501         }
 502
 503         /* complete the data exchange transaction, if exists */
 504         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 505                 nci_data_exchange_complete(ndev, NULL, -EIO);
 506
 507         nci_clear_target_list(ndev);
 508         atomic_set(&ndev->state, NCI_IDLE);
 509         nci_req_complete(ndev, NCI_STATUS_OK);
 510 }
 511
 512 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 513 {
 514         __u16 ntf_opcode = nci_opcode(skb->data);
 515
 516         pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 517                  nci_pbf(skb->data),
 518                  nci_opcode_gid(ntf_opcode),
 519                  nci_opcode_oid(ntf_opcode),
 520                  nci_plen(skb->data));
 521
 522         /* strip the nci control header */
 523         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 524
 525         switch (ntf_opcode) {
 526         case NCI_OP_CORE_CONN_CREDITS_NTF:
 527                 nci_core_conn_credits_ntf_packet(ndev, skb);
 528                 break;
 529
 530         case NCI_OP_CORE_GENERIC_ERROR_NTF:
 531                 nci_core_generic_error_ntf_packet(ndev, skb);
 532                 break;
 533
 534         case NCI_OP_CORE_INTF_ERROR_NTF:
 535                 nci_core_conn_intf_error_ntf_packet(ndev, skb);
 536                 break;
 537
 538         case NCI_OP_RF_DISCOVER_NTF:
 539                 nci_rf_discover_ntf_packet(ndev, skb);
 540                 break;
 541
 542         case NCI_OP_RF_INTF_ACTIVATED_NTF:
 543                 nci_rf_intf_activated_ntf_packet(ndev, skb);
 544                 break;
 545
 546         case NCI_OP_RF_DEACTIVATE_NTF:
 547                 nci_rf_deactivate_ntf_packet(ndev, skb);
 548                 break;
 549
 550         default:
 551                 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
 552                 break;
 553         }
 554
 555         kfree_skb(skb);
 556 }