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_conn_intf_error_ntf_packet(struct nci_dev *ndev,
  75                                                 struct sk_buff *skb)
  76 {
  77         struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
  78
  79         ntf->conn_id = nci_conn_id(&ntf->conn_id);
  80
  81         pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
  82
  83         /* complete the data exchange transaction, if exists */
  84         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
  85                 nci_data_exchange_complete(ndev, NULL, -EIO);
  86 }
  87
  88 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
  89                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
  90 {
  91         struct rf_tech_specific_params_nfca_poll *nfca_poll;
  92
  93         nfca_poll = &ntf->rf_tech_specific_params.nfca_poll;
  94
  95         nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
  96         data += 2;
  97
  98         nfca_poll->nfcid1_len = *data++;
  99
 100         pr_debug("sens_res 0x%x, nfcid1_len %d\n",
 101                  nfca_poll->sens_res, nfca_poll->nfcid1_len);
 102
 103         memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
 104         data += nfca_poll->nfcid1_len;
 105
 106         nfca_poll->sel_res_len = *data++;
 107
 108         if (nfca_poll->sel_res_len != 0)
 109                 nfca_poll->sel_res = *data++;
 110
 111         pr_debug("sel_res_len %d, sel_res 0x%x\n",
 112                  nfca_poll->sel_res_len,
 113                  nfca_poll->sel_res);
 114
 115         return data;
 116 }
 117
 118 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
 119                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 120 {
 121         struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
 122
 123         nfcb_poll = &ntf->rf_tech_specific_params.nfcb_poll;
 124
 125         nfcb_poll->sensb_res_len = *data++;
 126
 127         pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
 128
 129         memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
 130         data += nfcb_poll->sensb_res_len;
 131
 132         return data;
 133 }
 134
 135 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
 136                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 137 {
 138         struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
 139
 140         nfcf_poll = &ntf->rf_tech_specific_params.nfcf_poll;
 141
 142         nfcf_poll->bit_rate = *data++;
 143         nfcf_poll->sensf_res_len = *data++;
 144
 145         pr_debug("bit_rate %d, sensf_res_len %d\n",
 146                 nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
 147
 148         memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
 149         data += nfcf_poll->sensf_res_len;
 150
 151         return data;
 152 }
 153
 154 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 155                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 156 {
 157         struct activation_params_nfca_poll_iso_dep *nfca_poll;
 158         struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
 159
 160         switch (ntf->activation_rf_tech_and_mode) {
 161         case NCI_NFC_A_PASSIVE_POLL_MODE:
 162                 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
 163                 nfca_poll->rats_res_len = *data++;
 164                 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
 165                 if (nfca_poll->rats_res_len > 0) {
 166                         memcpy(nfca_poll->rats_res,
 167                                 data,
 168                                 nfca_poll->rats_res_len);
 169                 }
 170                 break;
 171
 172         case NCI_NFC_B_PASSIVE_POLL_MODE:
 173                 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
 174                 nfcb_poll->attrib_res_len = *data++;
 175                 pr_debug("attrib_res_len %d\n",
 176                         nfcb_poll->attrib_res_len);
 177                 if (nfcb_poll->attrib_res_len > 0) {
 178                         memcpy(nfcb_poll->attrib_res,
 179                                 data,
 180                                 nfcb_poll->attrib_res_len);
 181                 }
 182                 break;
 183
 184         default:
 185                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 186                        ntf->activation_rf_tech_and_mode);
 187                 return -EPROTO;
 188         }
 189
 190         return 0;
 191 }
 192
 193 static void nci_target_found(struct nci_dev *ndev,
 194                                 struct nci_rf_intf_activated_ntf *ntf)
 195 {
 196         struct nfc_target nfc_tgt;
 197
 198         memset(&nfc_tgt, 0, sizeof(nfc_tgt));
 199
 200         if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T)
 201                 nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK;
 202         else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
 203                 nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK;
 204         else if (ntf->rf_protocol == NCI_RF_PROTOCOL_T3T)
 205                 nfc_tgt.supported_protocols = NFC_PROTO_FELICA_MASK;
 206
 207         if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) {
 208                 pr_debug("the target found does not have the desired protocol\n");
 209                 return;
 210         }
 211
 212         pr_debug("new target found,  supported_protocols 0x%x\n",
 213                  nfc_tgt.supported_protocols);
 214
 215         if (ntf->activation_rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
 216                 nfc_tgt.sens_res =
 217                         ntf->rf_tech_specific_params.nfca_poll.sens_res;
 218                 nfc_tgt.sel_res =
 219                         ntf->rf_tech_specific_params.nfca_poll.sel_res;
 220                 nfc_tgt.nfcid1_len =
 221                         ntf->rf_tech_specific_params.nfca_poll.nfcid1_len;
 222                 if (nfc_tgt.nfcid1_len > 0) {
 223                         memcpy(nfc_tgt.nfcid1,
 224                                 ntf->rf_tech_specific_params.nfca_poll.nfcid1,
 225                                 nfc_tgt.nfcid1_len);
 226                 }
 227         } else if (ntf->activation_rf_tech_and_mode ==
 228                                                 NCI_NFC_B_PASSIVE_POLL_MODE) {
 229                 nfc_tgt.sensb_res_len =
 230                         ntf->rf_tech_specific_params.nfcb_poll.sensb_res_len;
 231                 if (nfc_tgt.sensb_res_len > 0) {
 232                         memcpy(nfc_tgt.sensb_res,
 233                                ntf->rf_tech_specific_params.nfcb_poll.sensb_res,
 234                                nfc_tgt.sensb_res_len);
 235                 }
 236         } else if (ntf->activation_rf_tech_and_mode ==
 237                                                 NCI_NFC_F_PASSIVE_POLL_MODE) {
 238                 nfc_tgt.sensf_res_len =
 239                         ntf->rf_tech_specific_params.nfcf_poll.sensf_res_len;
 240                 if (nfc_tgt.sensf_res_len > 0) {
 241                         memcpy(nfc_tgt.sensf_res,
 242                                ntf->rf_tech_specific_params.nfcf_poll.sensf_res,
 243                                nfc_tgt.sensf_res_len);
 244                 }
 245         }
 246
 247         ndev->target_available_prots = nfc_tgt.supported_protocols;
 248         ndev->max_data_pkt_payload_size = ntf->max_data_pkt_payload_size;
 249         ndev->initial_num_credits = ntf->initial_num_credits;
 250
 251         /* set the available credits to initial value */
 252         atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
 253
 254         nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1);
 255 }
 256
 257 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 258                                                 struct sk_buff *skb)
 259 {
 260         struct nci_rf_intf_activated_ntf ntf;
 261         __u8 *data = skb->data;
 262         int err = 0;
 263
 264         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 265
 266         ntf.rf_discovery_id = *data++;
 267         ntf.rf_interface = *data++;
 268         ntf.rf_protocol = *data++;
 269         ntf.activation_rf_tech_and_mode = *data++;
 270         ntf.max_data_pkt_payload_size = *data++;
 271         ntf.initial_num_credits = *data++;
 272         ntf.rf_tech_specific_params_len = *data++;
 273
 274         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 275         pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
 276         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 277         pr_debug("activation_rf_tech_and_mode 0x%x\n",
 278                  ntf.activation_rf_tech_and_mode);
 279         pr_debug("max_data_pkt_payload_size 0x%x\n",
 280                  ntf.max_data_pkt_payload_size);
 281         pr_debug("initial_num_credits 0x%x\n", ntf.initial_num_credits);
 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.activation_rf_tech_and_mode) {
 287                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 288                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 289                                 &ntf, data);
 290                         break;
 291
 292                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 293                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 294                                 &ntf, data);
 295                         break;
 296
 297                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 298                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 299                                 &ntf, data);
 300                         break;
 301
 302                 default:
 303                         pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 304                                ntf.activation_rf_tech_and_mode);
 305                         return;
 306                 }
 307         }
 308
 309         ntf.data_exch_rf_tech_and_mode = *data++;
 310         ntf.data_exch_tx_bit_rate = *data++;
 311         ntf.data_exch_rx_bit_rate = *data++;
 312         ntf.activation_params_len = *data++;
 313
 314         pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
 315                  ntf.data_exch_rf_tech_and_mode);
 316         pr_debug("data_exch_tx_bit_rate 0x%x\n",
 317                  ntf.data_exch_tx_bit_rate);
 318         pr_debug("data_exch_rx_bit_rate 0x%x\n",
 319                  ntf.data_exch_rx_bit_rate);
 320         pr_debug("activation_params_len %d\n",
 321                  ntf.activation_params_len);
 322
 323         if (ntf.activation_params_len > 0) {
 324                 switch (ntf.rf_interface) {
 325                 case NCI_RF_INTERFACE_ISO_DEP:
 326                         err = nci_extract_activation_params_iso_dep(ndev,
 327                                 &ntf, data);
 328                         break;
 329
 330                 case NCI_RF_INTERFACE_FRAME:
 331                         /* no activation params */
 332                         break;
 333
 334                 default:
 335                         pr_err("unsupported rf_interface 0x%x\n",
 336                                ntf.rf_interface);
 337                         return;
 338                 }
 339         }
 340
 341         if (!err)
 342                 nci_target_found(ndev, &ntf);
 343 }
 344
 345 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 346                                         struct sk_buff *skb)
 347 {
 348         struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
 349
 350         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 351
 352         atomic_set(&ndev->state, NCI_IDLE);
 353         ndev->target_active_prot = 0;
 354
 355         /* drop tx data queue */
 356         skb_queue_purge(&ndev->tx_q);
 357
 358         /* drop partial rx data packet */
 359         if (ndev->rx_data_reassembly) {
 360                 kfree_skb(ndev->rx_data_reassembly);
 361                 ndev->rx_data_reassembly = 0;
 362         }
 363
 364         /* complete the data exchange transaction, if exists */
 365         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 366                 nci_data_exchange_complete(ndev, NULL, -EIO);
 367
 368         nci_req_complete(ndev, NCI_STATUS_OK);
 369 }
 370
 371 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 372 {
 373         __u16 ntf_opcode = nci_opcode(skb->data);
 374
 375         pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 376                  nci_pbf(skb->data),
 377                  nci_opcode_gid(ntf_opcode),
 378                  nci_opcode_oid(ntf_opcode),
 379                  nci_plen(skb->data));
 380
 381         /* strip the nci control header */
 382         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 383
 384         switch (ntf_opcode) {
 385         case NCI_OP_CORE_CONN_CREDITS_NTF:
 386                 nci_core_conn_credits_ntf_packet(ndev, skb);
 387                 break;
 388
 389         case NCI_OP_CORE_INTF_ERROR_NTF:
 390                 nci_core_conn_intf_error_ntf_packet(ndev, skb);
 391                 break;
 392
 393         case NCI_OP_RF_INTF_ACTIVATED_NTF:
 394                 nci_rf_intf_activated_ntf_packet(ndev, skb);
 395                 break;
 396
 397         case NCI_OP_RF_DEACTIVATE_NTF:
 398                 nci_rf_deactivate_ntf_packet(ndev, skb);
 399                 break;
 400
 401         default:
 402                 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
 403                 break;
 404         }
 405
 406         kfree_skb(skb);
 407 }