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 #define NCI_HCI_ADM_CLEAR_ALL_PIPE 0x14
  74
  75 #define NCI_HFP_NO_CHAINING        0x80
  76
  77 #define NCI_NFCEE_ID_HCI                0x80
  78
  79 #define NCI_EVT_HOT_PLUG           0x03
  80
  81 #define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY       0x01
  82 #define NCI_HCI_ADM_CREATE_PIPE                 0x10
  83 #define NCI_HCI_ADM_DELETE_PIPE                 0x11
  84
  85 /* HCP headers */
  86 #define NCI_HCI_HCP_PACKET_HEADER_LEN      1
  87 #define NCI_HCI_HCP_MESSAGE_HEADER_LEN     1
  88 #define NCI_HCI_HCP_HEADER_LEN             2
  89
  90 /* HCP types */
  91 #define NCI_HCI_HCP_COMMAND        0x00
  92 #define NCI_HCI_HCP_EVENT          0x01
  93 #define NCI_HCI_HCP_RESPONSE       0x02
  94
  95 #define NCI_HCI_ADM_NOTIFY_PIPE_CREATED     0x12
  96 #define NCI_HCI_ADM_NOTIFY_PIPE_DELETED     0x13
  97 #define NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15
  98
  99 #define NCI_HCI_FRAGMENT           0x7f
 100 #define NCI_HCP_HEADER(type, instr) ((((type) & 0x03) << 6) |\
 101                                       ((instr) & 0x3f))
 102
 103 #define NCI_HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6)
 104 #define NCI_HCP_MSG_GET_CMD(header)  (header & 0x3f)
 105 #define NCI_HCP_MSG_GET_PIPE(header) (header & 0x7f)
 106
 107 static int nci_hci_result_to_errno(u8 result)
 108 {
 109         switch (result) {
 110         case NCI_HCI_ANY_OK:
 111                 return 0;
 112         case NCI_HCI_ANY_E_REG_PAR_UNKNOWN:
 113                 return -EOPNOTSUPP;
 114         case NCI_HCI_ANY_E_TIMEOUT:
 115                 return -ETIME;
 116         default:
 117                 return -1;
 118         }
 119 }
 120
 121 /* HCI core */
 122 static void nci_hci_reset_pipes(struct nci_hci_dev *hdev)
 123 {
 124         int i;
 125
 126         for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
 127                 hdev->pipes[i].gate = NCI_HCI_INVALID_GATE;
 128                 hdev->pipes[i].host = NCI_HCI_INVALID_HOST;
 129         }
 130         memset(hdev->gate2pipe, NCI_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 131 }
 132
 133 static void nci_hci_reset_pipes_per_host(struct nci_dev *ndev, u8 host)
 134 {
 135         int i;
 136
 137         for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
 138                 if (ndev->hci_dev->pipes[i].host == host) {
 139                         ndev->hci_dev->pipes[i].gate = NCI_HCI_INVALID_GATE;
 140                         ndev->hci_dev->pipes[i].host = NCI_HCI_INVALID_HOST;
 141                 }
 142         }
 143 }
 144
 145 /* Fragment HCI data over NCI packet.
 146  * NFC Forum NCI 10.2.2 Data Exchange:
 147  * The payload of the Data Packets sent on the Logical Connection SHALL be
 148  * valid HCP packets, as defined within [ETSI_102622]. Each Data Packet SHALL
 149  * contain a single HCP packet. NCI Segmentation and Reassembly SHALL NOT be
 150  * applied to Data Messages in either direction. The HCI fragmentation mechanism
 151  * is used if required.
 152  */
 153 static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
 154                              const u8 data_type, const u8 *data,
 155                              size_t data_len)
 156 {
 157         struct nci_conn_info    *conn_info;
 158         struct sk_buff *skb;
 159         int len, i, r;
 160         u8 cb = pipe;
 161
 162         conn_info = ndev->hci_dev->conn_info;
 163         if (!conn_info)
 164                 return -EPROTO;
 165
 166         i = 0;
 167         skb = nci_skb_alloc(ndev, conn_info->max_pkt_payload_len +
 168                             NCI_DATA_HDR_SIZE, GFP_KERNEL);
 169         if (!skb)
 170                 return -ENOMEM;
 171
 172         skb_reserve(skb, NCI_DATA_HDR_SIZE + 2);
 173         *(u8 *)skb_push(skb, 1) = data_type;
 174
 175         do {
 176                 len = conn_info->max_pkt_payload_len;
 177
 178                 /* If last packet add NCI_HFP_NO_CHAINING */
 179                 if (i + conn_info->max_pkt_payload_len -
 180                     (skb->len + 1) >= data_len) {
 181                         cb |= NCI_HFP_NO_CHAINING;
 182                         len = data_len - i;
 183                 } else {
 184                         len = conn_info->max_pkt_payload_len - skb->len - 1;
 185                 }
 186
 187                 *(u8 *)skb_push(skb, 1) = cb;
 188
 189                 if (len > 0)
 190                         skb_put_data(skb, data + i, len);
 191
 192                 r = nci_send_data(ndev, conn_info->conn_id, skb);
 193                 if (r < 0)
 194                         return r;
 195
 196                 i += len;
 197
 198                 if (i < data_len) {
 199                         skb = nci_skb_alloc(ndev,
 200                                             conn_info->max_pkt_payload_len +
 201                                             NCI_DATA_HDR_SIZE, GFP_KERNEL);
 202                         if (!skb)
 203                                 return -ENOMEM;
 204
 205                         skb_reserve(skb, NCI_DATA_HDR_SIZE + 1);
 206                 }
 207         } while (i < data_len);
 208
 209         return i;
 210 }
 211
 212 static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
 213 {
 214         struct nci_data *data = (struct nci_data *)opt;
 215
 216         nci_hci_send_data(ndev, data->pipe, data->cmd,
 217                           data->data, data->data_len);
 218 }
 219
 220 int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
 221                        const u8 *param, size_t param_len)
 222 {
 223         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 224
 225         if (pipe == NCI_HCI_INVALID_PIPE)
 226                 return -EADDRNOTAVAIL;
 227
 228         return nci_hci_send_data(ndev, pipe,
 229                         NCI_HCP_HEADER(NCI_HCI_HCP_EVENT, event),
 230                         param, param_len);
 231 }
 232 EXPORT_SYMBOL(nci_hci_send_event);
 233
 234 int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
 235                      const u8 *param, size_t param_len,
 236                      struct sk_buff **skb)
 237 {
 238         struct nci_hcp_message *message;
 239         struct nci_conn_info   *conn_info;
 240         struct nci_data data;
 241         int r;
 242         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 243
 244         if (pipe == NCI_HCI_INVALID_PIPE)
 245                 return -EADDRNOTAVAIL;
 246
 247         conn_info = ndev->hci_dev->conn_info;
 248         if (!conn_info)
 249                 return -EPROTO;
 250
 251         data.conn_id = conn_info->conn_id;
 252         data.pipe = pipe;
 253         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND, cmd);
 254         data.data = param;
 255         data.data_len = param_len;
 256
 257         r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
 258                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 259         if (r == NCI_STATUS_OK) {
 260                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 261                 r = nci_hci_result_to_errno(
 262                         NCI_HCP_MSG_GET_CMD(message->header));
 263                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 264
 265                 if (!r && skb)
 266                         *skb = conn_info->rx_skb;
 267         }
 268
 269         return r;
 270 }
 271 EXPORT_SYMBOL(nci_hci_send_cmd);
 272
 273 int nci_hci_clear_all_pipes(struct nci_dev *ndev)
 274 {
 275         int r;
 276
 277         r = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 278                              NCI_HCI_ADM_CLEAR_ALL_PIPE, NULL, 0, NULL);
 279         if (r < 0)
 280                 return r;
 281
 282         nci_hci_reset_pipes(ndev->hci_dev);
 283         return r;
 284 }
 285 EXPORT_SYMBOL(nci_hci_clear_all_pipes);
 286
 287 static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 288                                    u8 event, struct sk_buff *skb)
 289 {
 290         if (ndev->ops->hci_event_received)
 291                 ndev->ops->hci_event_received(ndev, pipe, event, skb);
 292 }
 293
 294 static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
 295                                  u8 cmd, struct sk_buff *skb)
 296 {
 297         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 298         u8 status = NCI_HCI_ANY_OK | ~NCI_HCI_FRAGMENT;
 299         u8 dest_gate, new_pipe;
 300         struct nci_hci_create_pipe_resp *create_info;
 301         struct nci_hci_delete_pipe_noti *delete_info;
 302         struct nci_hci_all_pipe_cleared_noti *cleared_info;
 303
 304         pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
 305
 306         switch (cmd) {
 307         case NCI_HCI_ADM_NOTIFY_PIPE_CREATED:
 308                 if (skb->len != 5) {
 309                         status = NCI_HCI_ANY_E_NOK;
 310                         goto exit;
 311                 }
 312                 create_info = (struct nci_hci_create_pipe_resp *)skb->data;
 313                 dest_gate = create_info->dest_gate;
 314                 new_pipe = create_info->pipe;
 315
 316                 /* Save the new created pipe and bind with local gate,
 317                  * the description for skb->data[3] is destination gate id
 318                  * but since we received this cmd from host controller, we
 319                  * are the destination and it is our local gate
 320                  */
 321                 ndev->hci_dev->gate2pipe[dest_gate] = new_pipe;
 322                 ndev->hci_dev->pipes[new_pipe].gate = dest_gate;
 323                 ndev->hci_dev->pipes[new_pipe].host =
 324                                                 create_info->src_host;
 325                 break;
 326         case NCI_HCI_ANY_OPEN_PIPE:
 327                 /* If the pipe is not created report an error */
 328                 if (gate == NCI_HCI_INVALID_GATE) {
 329                         status = NCI_HCI_ANY_E_NOK;
 330                         goto exit;
 331                 }
 332                 break;
 333         case NCI_HCI_ADM_NOTIFY_PIPE_DELETED:
 334                 if (skb->len != 1) {
 335                         status = NCI_HCI_ANY_E_NOK;
 336                         goto exit;
 337                 }
 338                 delete_info = (struct nci_hci_delete_pipe_noti *)skb->data;
 339
 340                 ndev->hci_dev->pipes[delete_info->pipe].gate =
 341                                                 NCI_HCI_INVALID_GATE;
 342                 ndev->hci_dev->pipes[delete_info->pipe].host =
 343                                                 NCI_HCI_INVALID_HOST;
 344                 break;
 345         case NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 346                 if (skb->len != 1) {
 347                         status = NCI_HCI_ANY_E_NOK;
 348                         goto exit;
 349                 }
 350
 351                 cleared_info =
 352                         (struct nci_hci_all_pipe_cleared_noti *)skb->data;
 353                 nci_hci_reset_pipes_per_host(ndev, cleared_info->host);
 354                 break;
 355         default:
 356                 pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 357                 break;
 358         }
 359
 360         if (ndev->ops->hci_cmd_received)
 361                 ndev->ops->hci_cmd_received(ndev, pipe, cmd, skb);
 362
 363 exit:
 364         nci_hci_send_data(ndev, pipe, status, NULL, 0);
 365
 366         kfree_skb(skb);
 367 }
 368
 369 static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
 370                                   u8 result, struct sk_buff *skb)
 371 {
 372         struct nci_conn_info    *conn_info;
 373         u8 status = result;
 374
 375         conn_info = ndev->hci_dev->conn_info;
 376         if (!conn_info) {
 377                 status = NCI_STATUS_REJECTED;
 378                 goto exit;
 379         }
 380
 381         conn_info->rx_skb = skb;
 382
 383 exit:
 384         nci_req_complete(ndev, NCI_STATUS_OK);
 385 }
 386
 387 /* Receive hcp message for pipe, with type and cmd.
 388  * skb contains optional message data only.
 389  */
 390 static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
 391                                    u8 type, u8 instruction, struct sk_buff *skb)
 392 {
 393         switch (type) {
 394         case NCI_HCI_HCP_RESPONSE:
 395                 nci_hci_resp_received(ndev, pipe, instruction, skb);
 396                 break;
 397         case NCI_HCI_HCP_COMMAND:
 398                 nci_hci_cmd_received(ndev, pipe, instruction, skb);
 399                 break;
 400         case NCI_HCI_HCP_EVENT:
 401                 nci_hci_event_received(ndev, pipe, instruction, skb);
 402                 break;
 403         default:
 404                 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
 405                        type, instruction);
 406                 kfree_skb(skb);
 407                 break;
 408         }
 409
 410         nci_req_complete(ndev, NCI_STATUS_OK);
 411 }
 412
 413 static void nci_hci_msg_rx_work(struct work_struct *work)
 414 {
 415         struct nci_hci_dev *hdev =
 416                 container_of(work, struct nci_hci_dev, msg_rx_work);
 417         struct sk_buff *skb;
 418         struct nci_hcp_message *message;
 419         u8 pipe, type, instruction;
 420
 421         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 422                 pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
 423                 skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 424                 message = (struct nci_hcp_message *)skb->data;
 425                 type = NCI_HCP_MSG_GET_TYPE(message->header);
 426                 instruction = NCI_HCP_MSG_GET_CMD(message->header);
 427                 skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 428
 429                 nci_hci_hcp_message_rx(hdev->ndev, pipe,
 430                                        type, instruction, skb);
 431         }
 432 }
 433
 434 void nci_hci_data_received_cb(void *context,
 435                               struct sk_buff *skb, int err)
 436 {
 437         struct nci_dev *ndev = (struct nci_dev *)context;
 438         struct nci_hcp_packet *packet;
 439         u8 pipe, type;
 440         struct sk_buff *hcp_skb;
 441         struct sk_buff *frag_skb;
 442         int msg_len;
 443
 444         pr_debug("\n");
 445
 446         if (err) {
 447                 nci_req_complete(ndev, err);
 448                 return;
 449         }
 450
 451         packet = (struct nci_hcp_packet *)skb->data;
 452         if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
 453                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 454                 return;
 455         }
 456
 457         /* it's the last fragment. Does it need re-aggregation? */
 458         if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
 459                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
 460                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 461
 462                 msg_len = 0;
 463                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 464                         msg_len += (frag_skb->len -
 465                                     NCI_HCI_HCP_PACKET_HEADER_LEN);
 466                 }
 467
 468                 hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
 469                                              msg_len, GFP_KERNEL);
 470                 if (!hcp_skb) {
 471                         nci_req_complete(ndev, -ENOMEM);
 472                         return;
 473                 }
 474
 475                 skb_put_u8(hcp_skb, pipe);
 476
 477                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 478                         msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
 479                         skb_put_data(hcp_skb,
 480                                      frag_skb->data + NCI_HCI_HCP_PACKET_HEADER_LEN,
 481                                      msg_len);
 482                 }
 483
 484                 skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
 485         } else {
 486                 packet->header &= NCI_HCI_FRAGMENT;
 487                 hcp_skb = skb;
 488         }
 489
 490         /* if this is a response, dispatch immediately to
 491          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 492          * in separate context where handler can also execute command.
 493          */
 494         packet = (struct nci_hcp_packet *)hcp_skb->data;
 495         type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
 496         if (type == NCI_HCI_HCP_RESPONSE) {
 497                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
 498                 skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 499                 nci_hci_hcp_message_rx(ndev, pipe, type,
 500                                        NCI_STATUS_OK, hcp_skb);
 501         } else {
 502                 skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
 503                 schedule_work(&ndev->hci_dev->msg_rx_work);
 504         }
 505 }
 506
 507 int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
 508 {
 509         struct nci_data data;
 510         struct nci_conn_info    *conn_info;
 511
 512         conn_info = ndev->hci_dev->conn_info;
 513         if (!conn_info)
 514                 return -EPROTO;
 515
 516         data.conn_id = conn_info->conn_id;
 517         data.pipe = pipe;
 518         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 519                                        NCI_HCI_ANY_OPEN_PIPE);
 520         data.data = NULL;
 521         data.data_len = 0;
 522
 523         return nci_request(ndev, nci_hci_send_data_req,
 524                         (unsigned long)&data,
 525                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 526 }
 527 EXPORT_SYMBOL(nci_hci_open_pipe);
 528
 529 static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
 530                               u8 dest_gate, int *result)
 531 {
 532         u8 pipe;
 533         struct sk_buff *skb;
 534         struct nci_hci_create_pipe_params params;
 535         struct nci_hci_create_pipe_resp *resp;
 536
 537         pr_debug("gate=%d\n", dest_gate);
 538
 539         params.src_gate = NCI_HCI_ADMIN_GATE;
 540         params.dest_host = dest_host;
 541         params.dest_gate = dest_gate;
 542
 543         *result = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 544                                    NCI_HCI_ADM_CREATE_PIPE,
 545                                    (u8 *)&params, sizeof(params), &skb);
 546         if (*result < 0)
 547                 return NCI_HCI_INVALID_PIPE;
 548
 549         resp = (struct nci_hci_create_pipe_resp *)skb->data;
 550         pipe = resp->pipe;
 551         kfree_skb(skb);
 552
 553         pr_debug("pipe created=%d\n", pipe);
 554
 555         return pipe;
 556 }
 557
 558 static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
 559 {
 560         pr_debug("\n");
 561
 562         return nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 563                                 NCI_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
 564 }
 565
 566 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
 567                       const u8 *param, size_t param_len)
 568 {
 569         struct nci_hcp_message *message;
 570         struct nci_conn_info *conn_info;
 571         struct nci_data data;
 572         int r;
 573         u8 *tmp;
 574         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 575
 576         pr_debug("idx=%d to gate %d\n", idx, gate);
 577
 578         if (pipe == NCI_HCI_INVALID_PIPE)
 579                 return -EADDRNOTAVAIL;
 580
 581         conn_info = ndev->hci_dev->conn_info;
 582         if (!conn_info)
 583                 return -EPROTO;
 584
 585         tmp = kmalloc(1 + param_len, GFP_KERNEL);
 586         if (!tmp)
 587                 return -ENOMEM;
 588
 589         *tmp = idx;
 590         memcpy(tmp + 1, param, param_len);
 591
 592         data.conn_id = conn_info->conn_id;
 593         data.pipe = pipe;
 594         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 595                                        NCI_HCI_ANY_SET_PARAMETER);
 596         data.data = tmp;
 597         data.data_len = param_len + 1;
 598
 599         r = nci_request(ndev, nci_hci_send_data_req,
 600                         (unsigned long)&data,
 601                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 602         if (r == NCI_STATUS_OK) {
 603                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 604                 r = nci_hci_result_to_errno(
 605                         NCI_HCP_MSG_GET_CMD(message->header));
 606                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 607         }
 608
 609         kfree(tmp);
 610         return r;
 611 }
 612 EXPORT_SYMBOL(nci_hci_set_param);
 613
 614 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
 615                       struct sk_buff **skb)
 616 {
 617         struct nci_hcp_message *message;
 618         struct nci_conn_info    *conn_info;
 619         struct nci_data data;
 620         int r;
 621         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 622
 623         pr_debug("idx=%d to gate %d\n", idx, gate);
 624
 625         if (pipe == NCI_HCI_INVALID_PIPE)
 626                 return -EADDRNOTAVAIL;
 627
 628         conn_info = ndev->hci_dev->conn_info;
 629         if (!conn_info)
 630                 return -EPROTO;
 631
 632         data.conn_id = conn_info->conn_id;
 633         data.pipe = pipe;
 634         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 635                                   NCI_HCI_ANY_GET_PARAMETER);
 636         data.data = &idx;
 637         data.data_len = 1;
 638
 639         r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
 640                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 641
 642         if (r == NCI_STATUS_OK) {
 643                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 644                 r = nci_hci_result_to_errno(
 645                         NCI_HCP_MSG_GET_CMD(message->header));
 646                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 647
 648                 if (!r && skb)
 649                         *skb = conn_info->rx_skb;
 650         }
 651
 652         return r;
 653 }
 654 EXPORT_SYMBOL(nci_hci_get_param);
 655
 656 int nci_hci_connect_gate(struct nci_dev *ndev,
 657                          u8 dest_host, u8 dest_gate, u8 pipe)
 658 {
 659         bool pipe_created = false;
 660         int r;
 661
 662         if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
 663                 return 0;
 664
 665         if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
 666                 return -EADDRINUSE;
 667
 668         if (pipe != NCI_HCI_INVALID_PIPE)
 669                 goto open_pipe;
 670
 671         switch (dest_gate) {
 672         case NCI_HCI_LINK_MGMT_GATE:
 673                 pipe = NCI_HCI_LINK_MGMT_PIPE;
 674         break;
 675         case NCI_HCI_ADMIN_GATE:
 676                 pipe = NCI_HCI_ADMIN_PIPE;
 677         break;
 678         default:
 679                 pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
 680                 if (pipe == NCI_HCI_INVALID_PIPE)
 681                         return r;
 682                 pipe_created = true;
 683                 break;
 684         }
 685
 686 open_pipe:
 687         r = nci_hci_open_pipe(ndev, pipe);
 688         if (r < 0) {
 689                 if (pipe_created) {
 690                         if (nci_hci_delete_pipe(ndev, pipe) < 0) {
 691                                 /* TODO: Cannot clean by deleting pipe...
 692                                  * -> inconsistent state
 693                                  */
 694                         }
 695                 }
 696                 return r;
 697         }
 698
 699         ndev->hci_dev->pipes[pipe].gate = dest_gate;
 700         ndev->hci_dev->pipes[pipe].host = dest_host;
 701         ndev->hci_dev->gate2pipe[dest_gate] = pipe;
 702
 703         return 0;
 704 }
 705 EXPORT_SYMBOL(nci_hci_connect_gate);
 706
 707 static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
 708                                      u8 gate_count,
 709                                      struct nci_hci_gate *gates)
 710 {
 711         int r;
 712
 713         while (gate_count--) {
 714                 r = nci_hci_connect_gate(ndev, gates->dest_host,
 715                                          gates->gate, gates->pipe);
 716                 if (r < 0)
 717                         return r;
 718                 gates++;
 719         }
 720
 721         return 0;
 722 }
 723
 724 int nci_hci_dev_session_init(struct nci_dev *ndev)
 725 {
 726         struct nci_conn_info    *conn_info;
 727         struct sk_buff *skb;
 728         int r;
 729
 730         ndev->hci_dev->count_pipes = 0;
 731         ndev->hci_dev->expected_pipes = 0;
 732
 733         conn_info = ndev->hci_dev->conn_info;
 734         if (!conn_info)
 735                 return -EPROTO;
 736
 737         conn_info->data_exchange_cb = nci_hci_data_received_cb;
 738         conn_info->data_exchange_cb_context = ndev;
 739
 740         nci_hci_reset_pipes(ndev->hci_dev);
 741
 742         if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
 743                 return -EPROTO;
 744
 745         r = nci_hci_connect_gate(ndev,
 746                                  ndev->hci_dev->init_data.gates[0].dest_host,
 747                                  ndev->hci_dev->init_data.gates[0].gate,
 748                                  ndev->hci_dev->init_data.gates[0].pipe);
 749         if (r < 0)
 750                 return r;
 751
 752         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 753                               NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
 754         if (r < 0)
 755                 return r;
 756
 757         if (skb->len &&
 758             skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
 759             !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
 760             ndev->ops->hci_load_session) {
 761                 /* Restore gate<->pipe table from some proprietary location. */
 762                 r = ndev->ops->hci_load_session(ndev);
 763         } else {
 764                 r = nci_hci_clear_all_pipes(ndev);
 765                 if (r < 0)
 766                         goto exit;
 767
 768                 r = nci_hci_dev_connect_gates(ndev,
 769                                               ndev->hci_dev->init_data.gate_count,
 770                                               ndev->hci_dev->init_data.gates);
 771                 if (r < 0)
 772                         goto exit;
 773
 774                 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 775                                       NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
 776                                       ndev->hci_dev->init_data.session_id,
 777                                       strlen(ndev->hci_dev->init_data.session_id));
 778         }
 779
 780 exit:
 781         kfree_skb(skb);
 782
 783         return r;
 784 }
 785 EXPORT_SYMBOL(nci_hci_dev_session_init);
 786
 787 struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
 788 {
 789         struct nci_hci_dev *hdev;
 790
 791         hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
 792         if (!hdev)
 793                 return NULL;
 794
 795         skb_queue_head_init(&hdev->rx_hcp_frags);
 796         INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
 797         skb_queue_head_init(&hdev->msg_rx_queue);
 798         hdev->ndev = ndev;
 799
 800         return hdev;
 801 }