btif/src/btif_mce.cc

/******************************************************************************
 *
 *  Copyright 2014 The Android Open Source Project
 *  Copyright 2009-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/*******************************************************************************
 *
 *  Filename:      btif_mce.c
 *
 *  Description:   Message Access Profile (MCE role) Bluetooth Interface
 *
 *
 ******************************************************************************/

#define LOG_TAG "bt_btif_mce"

#include <stdlib.h>
#include <string.h>

#include <hardware/bluetooth.h>
#include <hardware/bt_mce.h>

#include "bt_types.h"
#include "bta_api.h"
#include "bta_mce_api.h"
#include "btif_common.h"
#include "btif_util.h"

/*****************************************************************************
 *  Static variables
 *****************************************************************************/

static btmce_callbacks_t* bt_mce_callbacks = NULL;

static void btif_mce_mas_discovery_comp_evt(uint16_t event, char* p_param) {
  tBTA_MCE_MAS_DISCOVERY_COMP* evt_data = (tBTA_MCE_MAS_DISCOVERY_COMP*)p_param;
  btmce_mas_instance_t insts[BTA_MCE_MAX_MAS_INSTANCES];
  int i;

  BTIF_TRACE_EVENT("%s:  event = %d", __func__, event);

  if (event != BTA_MCE_MAS_DISCOVERY_COMP_EVT) return;

  for (i = 0; i < evt_data->num_mas; i++) {
    insts[i].id = evt_data->mas[i].instance_id;
    insts[i].scn = evt_data->mas[i].scn;
    insts[i].msg_types = evt_data->mas[i].msg_type;
    insts[i].p_name = evt_data->mas[i].p_srv_name;
  }

  RawAddress addr = evt_data->remote_addr;
  HAL_CBACK(bt_mce_callbacks, remote_mas_instances_cb,
            (bt_status_t)evt_data->status, &addr, evt_data->num_mas, insts);
}

static void mas_discovery_comp_copy_cb(uint16_t event, char* p_dest,
                                       char* p_src) {
  tBTA_MCE_MAS_DISCOVERY_COMP* p_dest_data =
      (tBTA_MCE_MAS_DISCOVERY_COMP*)p_dest;
  tBTA_MCE_MAS_DISCOVERY_COMP* p_src_data = (tBTA_MCE_MAS_DISCOVERY_COMP*)p_src;
  char* p_dest_str;
  int i;

  if (!p_src) return;

  if (event != BTA_MCE_MAS_DISCOVERY_COMP_EVT) return;

  maybe_non_aligned_memcpy(p_dest_data, p_src_data, sizeof(*p_src_data));

  p_dest_str = p_dest + sizeof(tBTA_MCE_MAS_DISCOVERY_COMP);

  for (i = 0; i < p_src_data->num_mas; i++) {
    p_dest_data->mas[i].p_srv_name = p_dest_str;
    memcpy(p_dest_str, p_src_data->mas[i].p_srv_name,
           p_src_data->mas[i].srv_name_len);
    p_dest_str += p_src_data->mas[i].srv_name_len;
    *(p_dest_str++) = '\0';
  }
}

static void mce_dm_cback(tBTA_MCE_EVT event, tBTA_MCE* p_data,
                         void* user_data) {
  switch (event) {
    case BTA_MCE_MAS_DISCOVERY_COMP_EVT: {
      int i;
      uint16_t param_len = sizeof(tBTA_MCE);

      /* include space for all p_srv_name copies including null-termination */
      for (i = 0; i < p_data->mas_disc_comp.num_mas; i++)
        param_len += (p_data->mas_disc_comp.mas[i].srv_name_len + 1);

      /* need to deepy copy p_srv_name and null-terminate */
      btif_transfer_context(btif_mce_mas_discovery_comp_evt, event,
                            (char*)p_data, param_len,
                            mas_discovery_comp_copy_cb);

      break;
    }
  }
}

static bt_status_t init(btmce_callbacks_t* callbacks) {
  BTIF_TRACE_EVENT("%s", __func__);

  bt_mce_callbacks = callbacks;

  btif_enable_service(BTA_MAP_SERVICE_ID);

  return BT_STATUS_SUCCESS;
}

static bt_status_t get_remote_mas_instances(RawAddress* bd_addr) {
  VLOG(2) << __func__ << ": remote_addr=" << bd_addr;

  BTA_MceGetRemoteMasInstances(*bd_addr);

  return BT_STATUS_SUCCESS;
}

static const btmce_interface_t mce_if = {
    sizeof(btmce_interface_t), init, get_remote_mas_instances,
};

const btmce_interface_t* btif_mce_get_interface(void) {
  BTIF_TRACE_EVENT("%s", __func__);
  return &mce_if;
}

/*******************************************************************************
 *
 * Function         btif_mce_execute_service
 *
 * Description      Initializes/Shuts down the service
 *
 * Returns          BT_STATUS_SUCCESS on success, BT_STATUS_FAIL otherwise
 *
 ******************************************************************************/
bt_status_t btif_mce_execute_service(bool b_enable) {
  BTIF_TRACE_EVENT("%s enable:%d", __func__, b_enable);

  if (b_enable) {
    BTA_MceEnable(mce_dm_cback);
  } else {
    /* This is called on BT disable so no need to extra cleanup */
  }
  return BT_STATUS_SUCCESS;
}