net/nfc/nci/hci.c

   1 /*
   2  *  The NFC Controller Interface is the communication protocol between an
   3  *  NFC Controller (NFCC) and a Device Host (DH).
   4  *  This is the HCI over NCI implementation, as specified in the 10.2
   5  *  section of the NCI 1.1 specification.
   6  *
   7  *  Copyright (C) 2014  STMicroelectronics SAS. All rights reserved.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  *
  21  */
  22
  23 #include <linux/skbuff.h>
  24
  25 #include "../nfc.h"
  26 #include <net/nfc/nci.h>
  27 #include <net/nfc/nci_core.h>
  28 #include <linux/nfc.h>
  29
  30 struct nci_data {
  31         u8              conn_id;
  32         u8              pipe;
  33         u8              cmd;
  34         const u8        *data;
  35         u32             data_len;
  36 } __packed;
  37
  38 struct nci_hci_create_pipe_params {
  39         u8 src_gate;
  40         u8 dest_host;
  41         u8 dest_gate;
  42 } __packed;
  43
  44 struct nci_hci_create_pipe_resp {
  45         u8 src_host;
  46         u8 src_gate;
  47         u8 dest_host;
  48         u8 dest_gate;
  49         u8 pipe;
  50 } __packed;
  51
  52 struct nci_hci_delete_pipe_noti {
  53         u8 pipe;
  54 } __packed;
  55
  56 struct nci_hci_all_pipe_cleared_noti {
  57         u8 host;
  58 } __packed;
  59
  60 struct nci_hcp_message {
  61         u8 header;      /* type -cmd,evt,rsp- + instruction */
  62         u8 data[];
  63 } __packed;
  64
  65 struct nci_hcp_packet {
  66         u8 header;      /* cbit+pipe */
  67         struct nci_hcp_message message;
  68 } __packed;
  69
  70 #define NCI_HCI_ANY_SET_PARAMETER  0x01
  71 #define NCI_HCI_ANY_GET_PARAMETER  0x02
  72 #define NCI_HCI_ANY_CLOSE_PIPE     0x04
  73
  74 #define NCI_HFP_NO_CHAINING        0x80
  75
  76 #define NCI_NFCEE_ID_HCI                0x80
  77
  78 #define NCI_EVT_HOT_PLUG           0x03
  79
  80 #define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY       0x01
  81
  82 /* HCP headers */
  83 #define NCI_HCI_HCP_PACKET_HEADER_LEN      1
  84 #define NCI_HCI_HCP_MESSAGE_HEADER_LEN     1
  85 #define NCI_HCI_HCP_HEADER_LEN             2
  86
  87 /* HCP types */
  88 #define NCI_HCI_HCP_COMMAND        0x00
  89 #define NCI_HCI_HCP_EVENT          0x01
  90 #define NCI_HCI_HCP_RESPONSE       0x02
  91
  92 #define NCI_HCI_ADM_NOTIFY_PIPE_CREATED     0x12
  93 #define NCI_HCI_ADM_NOTIFY_PIPE_DELETED     0x13
  94 #define NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15
  95
  96 #define NCI_HCI_FRAGMENT           0x7f
  97 #define NCI_HCP_HEADER(type, instr) ((((type) & 0x03) << 6) |\
  98                                       ((instr) & 0x3f))
  99
 100 #define NCI_HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6)
 101 #define NCI_HCP_MSG_GET_CMD(header)  (header & 0x3f)
 102 #define NCI_HCP_MSG_GET_PIPE(header) (header & 0x7f)
 103
 104 /* HCI core */
 105 static void nci_hci_reset_pipes(struct nci_hci_dev *hdev)
 106 {
 107         int i;
 108
 109         for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
 110                 hdev->pipes[i].gate = NCI_HCI_INVALID_GATE;
 111                 hdev->pipes[i].host = NCI_HCI_INVALID_HOST;
 112         }
 113         memset(hdev->gate2pipe, NCI_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 114 }
 115
 116 static void nci_hci_reset_pipes_per_host(struct nci_dev *ndev, u8 host)
 117 {
 118         int i;
 119
 120         for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
 121                 if (ndev->hci_dev->pipes[i].host == host) {
 122                         ndev->hci_dev->pipes[i].gate = NCI_HCI_INVALID_GATE;
 123                         ndev->hci_dev->pipes[i].host = NCI_HCI_INVALID_HOST;
 124                 }
 125         }
 126 }
 127
 128 /* Fragment HCI data over NCI packet.
 129  * NFC Forum NCI 10.2.2 Data Exchange:
 130  * The payload of the Data Packets sent on the Logical Connection SHALL be
 131  * valid HCP packets, as defined within [ETSI_102622]. Each Data Packet SHALL
 132  * contain a single HCP packet. NCI Segmentation and Reassembly SHALL NOT be
 133  * applied to Data Messages in either direction. The HCI fragmentation mechanism
 134  * is used if required.
 135  */
 136 static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
 137                              const u8 data_type, const u8 *data,
 138                              size_t data_len)
 139 {
 140         struct nci_conn_info    *conn_info;
 141         struct sk_buff *skb;
 142         int len, i, r;
 143         u8 cb = pipe;
 144
 145         conn_info = ndev->hci_dev->conn_info;
 146         if (!conn_info)
 147                 return -EPROTO;
 148
 149         skb = nci_skb_alloc(ndev, 2 + conn_info->max_pkt_payload_len +
 150                             NCI_DATA_HDR_SIZE, GFP_KERNEL);
 151         if (!skb)
 152                 return -ENOMEM;
 153
 154         skb_reserve(skb, 2 + NCI_DATA_HDR_SIZE);
 155         *skb_push(skb, 1) = data_type;
 156
 157         i = 0;
 158         len = conn_info->max_pkt_payload_len;
 159
 160         do {
 161                 /* If last packet add NCI_HFP_NO_CHAINING */
 162                 if (i + conn_info->max_pkt_payload_len -
 163                     (skb->len + 1) >= data_len) {
 164                         cb |= NCI_HFP_NO_CHAINING;
 165                         len = data_len - i;
 166                 } else {
 167                         len = conn_info->max_pkt_payload_len - skb->len - 1;
 168                 }
 169
 170                 *skb_push(skb, 1) = cb;
 171
 172                 if (len > 0)
 173                         memcpy(skb_put(skb, len), data + i, len);
 174
 175                 r = nci_send_data(ndev, conn_info->conn_id, skb);
 176                 if (r < 0)
 177                         return r;
 178
 179                 i += len;
 180                 if (i < data_len) {
 181                         skb_trim(skb, 0);
 182                         skb_pull(skb, len);
 183                 }
 184         } while (i < data_len);
 185
 186         return i;
 187 }
 188
 189 static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
 190 {
 191         struct nci_data *data = (struct nci_data *)opt;
 192
 193         nci_hci_send_data(ndev, data->pipe, data->cmd,
 194                           data->data, data->data_len);
 195 }
 196
 197 int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
 198                        const u8 *param, size_t param_len)
 199 {
 200         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 201
 202         if (pipe == NCI_HCI_INVALID_PIPE)
 203                 return -EADDRNOTAVAIL;
 204
 205         return nci_hci_send_data(ndev, pipe,
 206                         NCI_HCP_HEADER(NCI_HCI_HCP_EVENT, event),
 207                         param, param_len);
 208 }
 209 EXPORT_SYMBOL(nci_hci_send_event);
 210
 211 int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
 212                      const u8 *param, size_t param_len,
 213                      struct sk_buff **skb)
 214 {
 215         struct nci_conn_info    *conn_info;
 216         struct nci_data data;
 217         int r;
 218         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 219
 220         if (pipe == NCI_HCI_INVALID_PIPE)
 221                 return -EADDRNOTAVAIL;
 222
 223         conn_info = ndev->hci_dev->conn_info;
 224         if (!conn_info)
 225                 return -EPROTO;
 226
 227         data.conn_id = conn_info->conn_id;
 228         data.pipe = pipe;
 229         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND, cmd);
 230         data.data = param;
 231         data.data_len = param_len;
 232
 233         r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
 234                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 235
 236         if (r == NCI_STATUS_OK && skb)
 237                 *skb = conn_info->rx_skb;
 238
 239         return r;
 240 }
 241 EXPORT_SYMBOL(nci_hci_send_cmd);
 242
 243 static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 244                                    u8 event, struct sk_buff *skb)
 245 {
 246         if (ndev->ops->hci_event_received)
 247                 ndev->ops->hci_event_received(ndev, pipe, event, skb);
 248 }
 249
 250 static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
 251                                  u8 cmd, struct sk_buff *skb)
 252 {
 253         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 254         u8 status = NCI_HCI_ANY_OK | ~NCI_HCI_FRAGMENT;
 255         u8 dest_gate, new_pipe;
 256         struct nci_hci_create_pipe_resp *create_info;
 257         struct nci_hci_delete_pipe_noti *delete_info;
 258         struct nci_hci_all_pipe_cleared_noti *cleared_info;
 259
 260         pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
 261
 262         switch (cmd) {
 263         case NCI_HCI_ADM_NOTIFY_PIPE_CREATED:
 264                 if (skb->len != 5) {
 265                         status = NCI_HCI_ANY_E_NOK;
 266                         goto exit;
 267                 }
 268                 create_info = (struct nci_hci_create_pipe_resp *)skb->data;
 269                 dest_gate = create_info->dest_gate;
 270                 new_pipe = create_info->pipe;
 271
 272                 /* Save the new created pipe and bind with local gate,
 273                  * the description for skb->data[3] is destination gate id
 274                  * but since we received this cmd from host controller, we
 275                  * are the destination and it is our local gate
 276                  */
 277                 ndev->hci_dev->gate2pipe[dest_gate] = new_pipe;
 278                 ndev->hci_dev->pipes[new_pipe].gate = dest_gate;
 279                 ndev->hci_dev->pipes[new_pipe].host =
 280                                                 create_info->src_host;
 281                 break;
 282         case NCI_HCI_ANY_OPEN_PIPE:
 283                 /* If the pipe is not created report an error */
 284                 if (gate == NCI_HCI_INVALID_GATE) {
 285                         status = NCI_HCI_ANY_E_NOK;
 286                         goto exit;
 287                 }
 288                 break;
 289         case NCI_HCI_ADM_NOTIFY_PIPE_DELETED:
 290                 if (skb->len != 1) {
 291                         status = NCI_HCI_ANY_E_NOK;
 292                         goto exit;
 293                 }
 294                 delete_info = (struct nci_hci_delete_pipe_noti *)skb->data;
 295
 296                 ndev->hci_dev->pipes[delete_info->pipe].gate =
 297                                                 NCI_HCI_INVALID_GATE;
 298                 ndev->hci_dev->pipes[delete_info->pipe].host =
 299                                                 NCI_HCI_INVALID_HOST;
 300                 break;
 301         case NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 302                 if (skb->len != 1) {
 303                         status = NCI_HCI_ANY_E_NOK;
 304                         goto exit;
 305                 }
 306
 307                 cleared_info =
 308                         (struct nci_hci_all_pipe_cleared_noti *)skb->data;
 309                 nci_hci_reset_pipes_per_host(ndev, cleared_info->host);
 310                 break;
 311         default:
 312                 pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 313                 break;
 314         }
 315
 316         if (ndev->ops->hci_cmd_received)
 317                 ndev->ops->hci_cmd_received(ndev, pipe, cmd, skb);
 318
 319 exit:
 320         nci_hci_send_data(ndev, pipe, status, NULL, 0);
 321
 322         kfree_skb(skb);
 323 }
 324
 325 static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
 326                                   u8 result, struct sk_buff *skb)
 327 {
 328         struct nci_conn_info    *conn_info;
 329         u8 status = result;
 330
 331         if (result != NCI_HCI_ANY_OK)
 332                 goto exit;
 333
 334         conn_info = ndev->hci_dev->conn_info;
 335         if (!conn_info) {
 336                 status = NCI_STATUS_REJECTED;
 337                 goto exit;
 338         }
 339
 340         conn_info->rx_skb = skb;
 341
 342 exit:
 343         nci_req_complete(ndev, status);
 344 }
 345
 346 /* Receive hcp message for pipe, with type and cmd.
 347  * skb contains optional message data only.
 348  */
 349 static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
 350                                    u8 type, u8 instruction, struct sk_buff *skb)
 351 {
 352         switch (type) {
 353         case NCI_HCI_HCP_RESPONSE:
 354                 nci_hci_resp_received(ndev, pipe, instruction, skb);
 355                 break;
 356         case NCI_HCI_HCP_COMMAND:
 357                 nci_hci_cmd_received(ndev, pipe, instruction, skb);
 358                 break;
 359         case NCI_HCI_HCP_EVENT:
 360                 nci_hci_event_received(ndev, pipe, instruction, skb);
 361                 break;
 362         default:
 363                 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
 364                        type, instruction);
 365                 kfree_skb(skb);
 366                 break;
 367         }
 368
 369         nci_req_complete(ndev, 0);
 370 }
 371
 372 static void nci_hci_msg_rx_work(struct work_struct *work)
 373 {
 374         struct nci_hci_dev *hdev =
 375                 container_of(work, struct nci_hci_dev, msg_rx_work);
 376         struct sk_buff *skb;
 377         struct nci_hcp_message *message;
 378         u8 pipe, type, instruction;
 379
 380         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 381                 pipe = skb->data[0];
 382                 skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 383                 message = (struct nci_hcp_message *)skb->data;
 384                 type = NCI_HCP_MSG_GET_TYPE(message->header);
 385                 instruction = NCI_HCP_MSG_GET_CMD(message->header);
 386                 skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 387
 388                 nci_hci_hcp_message_rx(hdev->ndev, pipe,
 389                                        type, instruction, skb);
 390         }
 391 }
 392
 393 void nci_hci_data_received_cb(void *context,
 394                               struct sk_buff *skb, int err)
 395 {
 396         struct nci_dev *ndev = (struct nci_dev *)context;
 397         struct nci_hcp_packet *packet;
 398         u8 pipe, type, instruction;
 399         struct sk_buff *hcp_skb;
 400         struct sk_buff *frag_skb;
 401         int msg_len;
 402
 403         pr_debug("\n");
 404
 405         if (err) {
 406                 nci_req_complete(ndev, err);
 407                 return;
 408         }
 409
 410         packet = (struct nci_hcp_packet *)skb->data;
 411         if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
 412                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 413                 return;
 414         }
 415
 416         /* it's the last fragment. Does it need re-aggregation? */
 417         if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
 418                 pipe = packet->header & NCI_HCI_FRAGMENT;
 419                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 420
 421                 msg_len = 0;
 422                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 423                         msg_len += (frag_skb->len -
 424                                     NCI_HCI_HCP_PACKET_HEADER_LEN);
 425                 }
 426
 427                 hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
 428                                              msg_len, GFP_KERNEL);
 429                 if (!hcp_skb) {
 430                         nci_req_complete(ndev, -ENOMEM);
 431                         return;
 432                 }
 433
 434                 *skb_put(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN) = pipe;
 435
 436                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 437                        msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
 438                         memcpy(skb_put(hcp_skb, msg_len), frag_skb->data +
 439                                NCI_HCI_HCP_PACKET_HEADER_LEN, msg_len);
 440                 }
 441
 442                 skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
 443         } else {
 444                 packet->header &= NCI_HCI_FRAGMENT;
 445                 hcp_skb = skb;
 446         }
 447
 448         /* if this is a response, dispatch immediately to
 449          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 450          * in separate context where handler can also execute command.
 451          */
 452         packet = (struct nci_hcp_packet *)hcp_skb->data;
 453         type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
 454         if (type == NCI_HCI_HCP_RESPONSE) {
 455                 pipe = packet->header;
 456                 instruction = NCI_HCP_MSG_GET_CMD(packet->message.header);
 457                 skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN +
 458                          NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 459                 nci_hci_hcp_message_rx(ndev, pipe, type, instruction, hcp_skb);
 460         } else {
 461                 skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
 462                 schedule_work(&ndev->hci_dev->msg_rx_work);
 463         }
 464 }
 465
 466 int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
 467 {
 468         struct nci_data data;
 469         struct nci_conn_info    *conn_info;
 470
 471         conn_info = ndev->hci_dev->conn_info;
 472         if (!conn_info)
 473                 return -EPROTO;
 474
 475         data.conn_id = conn_info->conn_id;
 476         data.pipe = pipe;
 477         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 478                                        NCI_HCI_ANY_OPEN_PIPE);
 479         data.data = NULL;
 480         data.data_len = 0;
 481
 482         return nci_request(ndev, nci_hci_send_data_req,
 483                         (unsigned long)&data,
 484                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 485 }
 486 EXPORT_SYMBOL(nci_hci_open_pipe);
 487
 488 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
 489                       const u8 *param, size_t param_len)
 490 {
 491         struct nci_conn_info *conn_info;
 492         struct nci_data data;
 493         int r;
 494         u8 *tmp;
 495         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 496
 497         pr_debug("idx=%d to gate %d\n", idx, gate);
 498
 499         if (pipe == NCI_HCI_INVALID_PIPE)
 500                 return -EADDRNOTAVAIL;
 501
 502         conn_info = ndev->hci_dev->conn_info;
 503         if (!conn_info)
 504                 return -EPROTO;
 505
 506         tmp = kmalloc(1 + param_len, GFP_KERNEL);
 507         if (!tmp)
 508                 return -ENOMEM;
 509
 510         *tmp = idx;
 511         memcpy(tmp + 1, param, param_len);
 512
 513         data.conn_id = conn_info->conn_id;
 514         data.pipe = pipe;
 515         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 516                                        NCI_HCI_ANY_SET_PARAMETER);
 517         data.data = tmp;
 518         data.data_len = param_len + 1;
 519
 520         r = nci_request(ndev, nci_hci_send_data_req,
 521                         (unsigned long)&data,
 522                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 523
 524         kfree(tmp);
 525         return r;
 526 }
 527 EXPORT_SYMBOL(nci_hci_set_param);
 528
 529 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
 530                       struct sk_buff **skb)
 531 {
 532         struct nci_conn_info    *conn_info;
 533         struct nci_data data;
 534         int r;
 535         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 536
 537         pr_debug("idx=%d to gate %d\n", idx, gate);
 538
 539         if (pipe == NCI_HCI_INVALID_PIPE)
 540                 return -EADDRNOTAVAIL;
 541
 542         conn_info = ndev->hci_dev->conn_info;
 543         if (!conn_info)
 544                 return -EPROTO;
 545
 546         data.conn_id = conn_info->conn_id;
 547         data.pipe = pipe;
 548         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 549                                   NCI_HCI_ANY_GET_PARAMETER);
 550         data.data = &idx;
 551         data.data_len = 1;
 552
 553         r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
 554                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 555
 556         if (r == NCI_STATUS_OK)
 557                 *skb = conn_info->rx_skb;
 558
 559         return r;
 560 }
 561 EXPORT_SYMBOL(nci_hci_get_param);
 562
 563 int nci_hci_connect_gate(struct nci_dev *ndev,
 564                          u8 dest_host, u8 dest_gate, u8 pipe)
 565 {
 566         int r;
 567
 568         if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
 569                 return 0;
 570
 571         if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
 572                 return -EADDRINUSE;
 573
 574         if (pipe != NCI_HCI_INVALID_PIPE)
 575                 goto open_pipe;
 576
 577         switch (dest_gate) {
 578         case NCI_HCI_LINK_MGMT_GATE:
 579                 pipe = NCI_HCI_LINK_MGMT_PIPE;
 580         break;
 581         case NCI_HCI_ADMIN_GATE:
 582                 pipe = NCI_HCI_ADMIN_PIPE;
 583         break;
 584         }
 585
 586 open_pipe:
 587         r = nci_hci_open_pipe(ndev, pipe);
 588         if (r < 0)
 589                 return r;
 590
 591         ndev->hci_dev->pipes[pipe].gate = dest_gate;
 592         ndev->hci_dev->pipes[pipe].host = dest_host;
 593         ndev->hci_dev->gate2pipe[dest_gate] = pipe;
 594
 595         return 0;
 596 }
 597 EXPORT_SYMBOL(nci_hci_connect_gate);
 598
 599 static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
 600                                      u8 gate_count,
 601                                      struct nci_hci_gate *gates)
 602 {
 603         int r;
 604
 605         while (gate_count--) {
 606                 r = nci_hci_connect_gate(ndev, gates->dest_host,
 607                                          gates->gate, gates->pipe);
 608                 if (r < 0)
 609                         return r;
 610                 gates++;
 611         }
 612
 613         return 0;
 614 }
 615
 616 int nci_hci_dev_session_init(struct nci_dev *ndev)
 617 {
 618         struct nci_conn_info    *conn_info;
 619         struct sk_buff *skb;
 620         int r;
 621
 622         ndev->hci_dev->count_pipes = 0;
 623         ndev->hci_dev->expected_pipes = 0;
 624
 625         conn_info = ndev->hci_dev->conn_info;
 626         if (!conn_info)
 627                 return -EPROTO;
 628
 629         conn_info->data_exchange_cb = nci_hci_data_received_cb;
 630         conn_info->data_exchange_cb_context = ndev;
 631
 632         nci_hci_reset_pipes(ndev->hci_dev);
 633
 634         if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
 635                 return -EPROTO;
 636
 637         r = nci_hci_connect_gate(ndev,
 638                                  ndev->hci_dev->init_data.gates[0].dest_host,
 639                                  ndev->hci_dev->init_data.gates[0].gate,
 640                                  ndev->hci_dev->init_data.gates[0].pipe);
 641         if (r < 0)
 642                 return r;
 643
 644         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 645                               NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
 646         if (r < 0)
 647                 return r;
 648
 649         if (skb->len &&
 650             skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
 651             !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
 652             ndev->ops->hci_load_session) {
 653                 /* Restore gate<->pipe table from some proprietary location. */
 654                 r = ndev->ops->hci_load_session(ndev);
 655         } else {
 656                 r = nci_hci_dev_connect_gates(ndev,
 657                                               ndev->hci_dev->init_data.gate_count,
 658                                               ndev->hci_dev->init_data.gates);
 659                 if (r < 0)
 660                         goto exit;
 661
 662                 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 663                                       NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
 664                                       ndev->hci_dev->init_data.session_id,
 665                                       strlen(ndev->hci_dev->init_data.session_id));
 666         }
 667
 668 exit:
 669         kfree_skb(skb);
 670
 671         return r;
 672 }
 673 EXPORT_SYMBOL(nci_hci_dev_session_init);
 674
 675 struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
 676 {
 677         struct nci_hci_dev *hdev;
 678
 679         hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
 680         if (!hdev)
 681                 return NULL;
 682
 683         skb_queue_head_init(&hdev->rx_hcp_frags);
 684         INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
 685         skb_queue_head_init(&hdev->msg_rx_queue);
 686         hdev->ndev = ndev;
 687
 688         return hdev;
 689 }