btif/src/btif_hf.cc

/******************************************************************************
 *
 *  Copyright (C) 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_hf.c
 *
 *  Description:   Handsfree Profile Bluetooth Interface
 *
 *
 ******************************************************************************/

#define LOG_TAG "bt_btif_hf"

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

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

#include "bta/include/utl.h"
#include "bta_ag_api.h"
#include "btif_common.h"
#include "btif_hf.h"
#include "btif_profile_queue.h"
#include "btif_util.h"
#include "osi/include/properties.h"

/*******************************************************************************
 *  Constants & Macros
 ******************************************************************************/
#ifndef BTIF_HSAG_SERVICE_NAME
#define BTIF_HSAG_SERVICE_NAME ("Headset Gateway")
#endif

#ifndef BTIF_HFAG_SERVICE_NAME
#define BTIF_HFAG_SERVICE_NAME ("Handsfree Gateway")
#endif

#ifndef BTIF_HF_SERVICES
#define BTIF_HF_SERVICES (BTA_HSP_SERVICE_MASK | BTA_HFP_SERVICE_MASK)
#endif

#ifndef BTIF_HF_SERVICE_NAMES
#define BTIF_HF_SERVICE_NAMES \
  { BTIF_HSAG_SERVICE_NAME, BTIF_HFAG_SERVICE_NAME }
#endif

#ifndef BTIF_HF_SECURITY
#define BTIF_HF_SECURITY (BTA_SEC_AUTHENTICATE | BTA_SEC_ENCRYPT)
#endif

#ifndef BTIF_HF_FEATURES
#define BTIF_HF_FEATURES                                       \
  (BTA_AG_FEAT_3WAY | BTA_AG_FEAT_ECNR | BTA_AG_FEAT_REJECT |  \
   BTA_AG_FEAT_ECS | BTA_AG_FEAT_EXTERR | BTA_AG_FEAT_VREC |   \
   BTA_AG_FEAT_CODEC | BTA_AG_FEAT_HF_IND | BTA_AG_FEAT_ESCO | \
   BTA_AG_FEAT_UNAT)
#endif

/* HF features supported at runtime */
static uint32_t btif_hf_features = BTIF_HF_FEATURES;

#define BTIF_HF_CALL_END_TIMEOUT 6

#define BTIF_HF_INVALID_IDX (-1)

/* Number of BTIF-HF control blocks */
#define BTIF_HF_NUM_CB 2

/* Max HF clients supported from App */
uint16_t btif_max_hf_clients = 1;

/* HF app ids for service registration */
typedef enum {
  BTIF_HF_ID_1 = 0,
  BTIF_HF_ID_2,
#if (BTIF_HF_NUM_CB == 3)
  BTIF_HF_ID_3
#endif
} bthf_hf_id_t;

uint16_t bthf_hf_id[BTIF_HF_NUM_CB] = {BTIF_HF_ID_1, BTIF_HF_ID_2,
#if (BTIF_HF_NUM_CB == 3)
                                       BTIF_HF_ID_3
#endif
};

/*******************************************************************************
 *  Local type definitions
 ******************************************************************************/

/*******************************************************************************
 *  Static variables
 ******************************************************************************/
static bthf_callbacks_t* bt_hf_callbacks = NULL;
static int hf_idx = BTIF_HF_INVALID_IDX;

#define CHECK_BTHF_INIT()                                             \
  do {                                                                \
    if (bt_hf_callbacks == NULL) {                                    \
      BTIF_TRACE_WARNING("BTHF: %s: BTHF not initialized", __func__); \
      return BT_STATUS_NOT_READY;                                     \
    } else {                                                          \
      BTIF_TRACE_EVENT("BTHF: %s", __func__);                         \
    }                                                                 \
  } while (0)

/* BTIF-HF control block to map bdaddr to BTA handle */
typedef struct _btif_hf_cb {
  uint16_t handle;
  RawAddress connected_bda;
  bthf_connection_state_t state;
  bthf_vr_state_t vr_state;
  tBTA_AG_PEER_FEAT peer_feat;
  int num_active;
  int num_held;
  struct timespec call_end_timestamp;
  struct timespec connected_timestamp;
  bthf_call_state_t call_setup_state;
} btif_hf_cb_t;

static btif_hf_cb_t btif_hf_cb[BTIF_HF_NUM_CB];

/*******************************************************************************
 *  Static functions
 ******************************************************************************/

/*******************************************************************************
 *  Externs
 ******************************************************************************/
/* By default, even though codec negotiation is enabled, we will not use WBS as
 * the default
 * codec unless this variable is set to true.
 */
#ifndef BTIF_HF_WBS_PREFERRED
#define BTIF_HF_WBS_PREFERRED false
#endif

bool btif_conf_hf_force_wbs = BTIF_HF_WBS_PREFERRED;

/*******************************************************************************
 *  Functions
 ******************************************************************************/

/*******************************************************************************
 *
 * Function         is_connected
 *
 * Description      Internal function to check if HF is connected
 *
 * Returns          true if connected
 *
 ******************************************************************************/
static bool is_connected(RawAddress* bd_addr) {
  int i;
  for (i = 0; i < btif_max_hf_clients; ++i) {
    if (((btif_hf_cb[i].state == BTHF_CONNECTION_STATE_CONNECTED) ||
         (btif_hf_cb[i].state == BTHF_CONNECTION_STATE_SLC_CONNECTED)) &&
        (!bd_addr || *bd_addr == btif_hf_cb[i].connected_bda))
      return true;
  }
  return false;
}

/*******************************************************************************
 *
 * Function         btif_hf_idx_by_bdaddr
 *
 * Description      Internal function to get idx by bdaddr
 *
 * Returns          idx
 *
 ******************************************************************************/
static int btif_hf_idx_by_bdaddr(RawAddress* bd_addr) {
  int i;
  for (i = 0; i < btif_max_hf_clients; ++i) {
    if (*bd_addr == btif_hf_cb[i].connected_bda) return i;
  }
  return BTIF_HF_INVALID_IDX;
}

/*******************************************************************************
 *
 * Function         callstate_to_callsetup
 *
 * Description      Converts HAL call state to BTA call setup indicator value
 *
 * Returns          BTA call indicator value
 *
 ******************************************************************************/
static uint8_t callstate_to_callsetup(bthf_call_state_t call_state) {
  uint8_t call_setup = 0;
  if (call_state == BTHF_CALL_STATE_INCOMING) call_setup = 1;
  if (call_state == BTHF_CALL_STATE_DIALING) call_setup = 2;
  if (call_state == BTHF_CALL_STATE_ALERTING) call_setup = 3;

  return call_setup;
}

/*******************************************************************************
 *
 * Function         send_at_result
 *
 * Description      Send AT result code (OK/ERROR)
 *
 * Returns          void
 *
 ******************************************************************************/
static void send_at_result(uint8_t ok_flag, uint16_t errcode, int idx) {
  tBTA_AG_RES_DATA ag_res;
  memset(&ag_res, 0, sizeof(ag_res));

  ag_res.ok_flag = ok_flag;
  if (ok_flag == BTA_AG_OK_ERROR) {
    ag_res.errcode = errcode;
  }

  BTA_AgResult(btif_hf_cb[idx].handle, BTA_AG_UNAT_RES, &ag_res);
}

/*******************************************************************************
 *
 * Function         send_indicator_update
 *
 * Description      Send indicator update (CIEV)
 *
 * Returns          void
 *
 ******************************************************************************/
static void send_indicator_update(uint16_t indicator, uint16_t value) {
  tBTA_AG_RES_DATA ag_res;

  memset(&ag_res, 0, sizeof(tBTA_AG_RES_DATA));
  ag_res.ind.id = indicator;
  ag_res.ind.value = value;

  BTA_AgResult(BTA_AG_HANDLE_ALL, BTA_AG_IND_RES, &ag_res);
}

void clear_phone_state_multihf(int idx) {
  btif_hf_cb[idx].call_setup_state = BTHF_CALL_STATE_IDLE;
  btif_hf_cb[idx].num_active = btif_hf_cb[idx].num_held = 0;
}

/*******************************************************************************
 *
 * Function         btif_hf_latest_connected_idx
 *
 * Description      Returns idx for latest connected HF
 *
 * Returns          int
 *
 ******************************************************************************/
static int btif_hf_latest_connected_idx() {
  struct timespec now, conn_time_delta;
  int latest_conn_idx = BTIF_HF_INVALID_IDX, i;

  clock_gettime(CLOCK_MONOTONIC, &now);
  conn_time_delta.tv_sec = now.tv_sec;

  for (i = 0; i < btif_max_hf_clients; i++) {
    if (btif_hf_cb[i].state == BTHF_CONNECTION_STATE_SLC_CONNECTED) {
      if ((now.tv_sec - btif_hf_cb[i].connected_timestamp.tv_sec) <
          conn_time_delta.tv_sec) {
        conn_time_delta.tv_sec =
            now.tv_sec - btif_hf_cb[i].connected_timestamp.tv_sec;
        latest_conn_idx = i;
      }
    }
  }
  return latest_conn_idx;
}

/*******************************************************************************
 *
 * Function         btif_hf_check_if_slc_connected
 *
 * Description      Returns BT_STATUS_SUCCESS if SLC is up for any HF
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t btif_hf_check_if_slc_connected() {
  if (bt_hf_callbacks == NULL) {
    BTIF_TRACE_WARNING("BTHF: %s: BTHF not initialized", __func__);
    return BT_STATUS_NOT_READY;
  } else {
    int i;
    for (i = 0; i < btif_max_hf_clients; i++) {
      if (btif_hf_cb[i].state == BTHF_CONNECTION_STATE_SLC_CONNECTED) {
        BTIF_TRACE_EVENT("BTHF: %s: slc connected for idx = %d", __func__, i);
        return BT_STATUS_SUCCESS;
      }
    }
    BTIF_TRACE_WARNING("BTHF: %s: No SLC connection up", __func__);
    return BT_STATUS_NOT_READY;
  }
}

/*****************************************************************************
 *   Section name (Group of functions)
 ****************************************************************************/

/*****************************************************************************
 *
 *   btif hf api functions (no context switch)
 *
 ****************************************************************************/

/*******************************************************************************
 *
 * Function         btif_hf_upstreams_evt
 *
 * Description      Executes HF UPSTREAMS events in btif context
 *
 * Returns          void
 *
 ******************************************************************************/
static void btif_hf_upstreams_evt(uint16_t event, char* p_param) {
  tBTA_AG* p_data = (tBTA_AG*)p_param;
  int idx = p_data->hdr.handle - 1;

  BTIF_TRACE_DEBUG("%s: event=%s", __func__, dump_hf_event(event));

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return;
  }

  switch (event) {
    case BTA_AG_ENABLE_EVT:
    case BTA_AG_DISABLE_EVT:
      break;

    case BTA_AG_REGISTER_EVT:
      btif_hf_cb[idx].handle = p_data->reg.hdr.handle;
      BTIF_TRACE_DEBUG(
          "%s: BTA_AG_REGISTER_EVT,"
          "btif_hf_cb.handle = %d",
          __func__, btif_hf_cb[idx].handle);
      break;

    case BTA_AG_OPEN_EVT:
      if (p_data->open.status == BTA_AG_SUCCESS) {
        btif_hf_cb[idx].connected_bda = p_data->open.bd_addr;
        btif_hf_cb[idx].state = BTHF_CONNECTION_STATE_CONNECTED;
        btif_hf_cb[idx].peer_feat = 0;
        clear_phone_state_multihf(idx);
      } else if (btif_hf_cb[idx].state == BTHF_CONNECTION_STATE_CONNECTING) {
        btif_hf_cb[idx].state = BTHF_CONNECTION_STATE_DISCONNECTED;
      } else {
        BTIF_TRACE_WARNING(
            "%s: AG open failed, but another device connected. status=%d "
            "state=%d connected device=%s",
            __func__, p_data->open.status, btif_hf_cb[idx].state,
            btif_hf_cb[idx].connected_bda.ToString().c_str());
        break;
      }

      HAL_CBACK(bt_hf_callbacks, connection_state_cb, btif_hf_cb[idx].state,
                &btif_hf_cb[idx].connected_bda);

      if (btif_hf_cb[idx].state == BTHF_CONNECTION_STATE_DISCONNECTED)
        btif_hf_cb[idx].connected_bda = RawAddress::kAny;

      if (p_data->open.status != BTA_AG_SUCCESS) btif_queue_advance();
      break;

    case BTA_AG_CLOSE_EVT:
      btif_hf_cb[idx].connected_timestamp.tv_sec = 0;
      btif_hf_cb[idx].state = BTHF_CONNECTION_STATE_DISCONNECTED;
      BTIF_TRACE_DEBUG(
          "%s: BTA_AG_CLOSE_EVT,"
          "idx = %d, btif_hf_cb.handle = %d",
          __func__, idx, btif_hf_cb[idx].handle);
      HAL_CBACK(bt_hf_callbacks, connection_state_cb, btif_hf_cb[idx].state,
                &btif_hf_cb[idx].connected_bda);
      btif_hf_cb[idx].connected_bda = RawAddress::kAny;
      btif_hf_cb[idx].peer_feat = 0;
      clear_phone_state_multihf(idx);
      hf_idx = btif_hf_latest_connected_idx();
      /* If AG_OPEN was received but SLC was not setup in a specified time (10
       *seconds),
       ** then AG_CLOSE may be received. We need to advance the queue here
       */
      btif_queue_advance();
      break;

    case BTA_AG_CONN_EVT:
      clock_gettime(CLOCK_MONOTONIC, &btif_hf_cb[idx].connected_timestamp);
      BTIF_TRACE_DEBUG("%s: BTA_AG_CONN_EVT, idx = %d ", __func__, idx);
      btif_hf_cb[idx].peer_feat = p_data->conn.peer_feat;
      btif_hf_cb[idx].state = BTHF_CONNECTION_STATE_SLC_CONNECTED;
      hf_idx = btif_hf_latest_connected_idx();

      HAL_CBACK(bt_hf_callbacks, connection_state_cb, btif_hf_cb[idx].state,
                &btif_hf_cb[idx].connected_bda);
      btif_queue_advance();
      break;

    case BTA_AG_AUDIO_OPEN_EVT:
      hf_idx = idx;
      HAL_CBACK(bt_hf_callbacks, audio_state_cb, BTHF_AUDIO_STATE_CONNECTED,
                &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AUDIO_CLOSE_EVT:
      HAL_CBACK(bt_hf_callbacks, audio_state_cb, BTHF_AUDIO_STATE_DISCONNECTED,
                &btif_hf_cb[idx].connected_bda);
      break;

    /* BTA auto-responds, silently discard */
    case BTA_AG_SPK_EVT:
    case BTA_AG_MIC_EVT:
      HAL_CBACK(bt_hf_callbacks, volume_cmd_cb,
                (event == BTA_AG_SPK_EVT) ? BTHF_VOLUME_TYPE_SPK
                                          : BTHF_VOLUME_TYPE_MIC,
                p_data->val.num, &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_A_EVT:
      if ((btif_hf_cb[0].num_held + btif_hf_cb[0].num_active) == 0)
        hf_idx = idx;
      else
        BTIF_TRACE_DEBUG("Donot set hf_idx for ATA since already in a call");

      HAL_CBACK(bt_hf_callbacks, answer_call_cmd_cb,
                &btif_hf_cb[idx].connected_bda);
      break;

    /* Java needs to send OK/ERROR for these commands */
    case BTA_AG_AT_BLDN_EVT:
    case BTA_AG_AT_D_EVT:
      if ((btif_hf_cb[0].num_held + btif_hf_cb[0].num_active) == 0)
        hf_idx = idx;
      else
        BTIF_TRACE_DEBUG("Donot set hf_idx for BLDN/D since already in a call");

      HAL_CBACK(bt_hf_callbacks, dial_call_cmd_cb,
                (event == BTA_AG_AT_D_EVT) ? p_data->val.str : NULL,
                &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_CHUP_EVT:
      HAL_CBACK(bt_hf_callbacks, hangup_call_cmd_cb,
                &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_CIND_EVT:
      HAL_CBACK(bt_hf_callbacks, cind_cmd_cb, &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_VTS_EVT:
      HAL_CBACK(bt_hf_callbacks, dtmf_cmd_cb, p_data->val.str[0],
                &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_BVRA_EVT:
      HAL_CBACK(bt_hf_callbacks, vr_cmd_cb,
                (p_data->val.num == 1) ? BTHF_VR_STATE_STARTED
                                       : BTHF_VR_STATE_STOPPED,
                &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_NREC_EVT:
      HAL_CBACK(bt_hf_callbacks, nrec_cmd_cb,
                (p_data->val.num == 1) ? BTHF_NREC_START : BTHF_NREC_STOP,
                &btif_hf_cb[idx].connected_bda);
      break;

    /* TODO: Add a callback for CBC */
    case BTA_AG_AT_CBC_EVT:
      break;

    case BTA_AG_AT_CKPD_EVT:
      HAL_CBACK(bt_hf_callbacks, key_pressed_cmd_cb,
                &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_WBS_EVT:
      BTIF_TRACE_DEBUG(
          "BTA_AG_WBS_EVT Set codec status %d codec %d 1=CVSD 2=MSBC",
          p_data->val.hdr.status, p_data->val.num);
      if (p_data->val.num == BTA_AG_CODEC_CVSD) {
        HAL_CBACK(bt_hf_callbacks, wbs_cb, BTHF_WBS_NO,
                  &btif_hf_cb[idx].connected_bda);
      } else if (p_data->val.num == BTA_AG_CODEC_MSBC) {
        HAL_CBACK(bt_hf_callbacks, wbs_cb, BTHF_WBS_YES,
                  &btif_hf_cb[idx].connected_bda);
      } else {
        HAL_CBACK(bt_hf_callbacks, wbs_cb, BTHF_WBS_NONE,
                  &btif_hf_cb[idx].connected_bda);
      }
      break;

    /* Java needs to send OK/ERROR for these commands */
    case BTA_AG_AT_CHLD_EVT:
      HAL_CBACK(bt_hf_callbacks, chld_cmd_cb,
                (bthf_chld_type_t)atoi(p_data->val.str),
                &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_CLCC_EVT:
      HAL_CBACK(bt_hf_callbacks, clcc_cmd_cb, &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_COPS_EVT:
      HAL_CBACK(bt_hf_callbacks, cops_cmd_cb, &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_UNAT_EVT:
      HAL_CBACK(bt_hf_callbacks, unknown_at_cmd_cb, p_data->val.str,
                &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_CNUM_EVT:
      HAL_CBACK(bt_hf_callbacks, cnum_cmd_cb, &btif_hf_cb[idx].connected_bda);
      break;

    /* TODO: Some of these commands may need to be sent to app. For now respond
     * with error */
    case BTA_AG_AT_BINP_EVT:
    case BTA_AG_AT_BTRH_EVT:
      send_at_result(BTA_AG_OK_ERROR, BTA_AG_ERR_OP_NOT_SUPPORTED, idx);
      break;
    case BTA_AG_AT_BAC_EVT:
      BTIF_TRACE_DEBUG("AG Bitmap of peer-codecs %d", p_data->val.num);
      /* If the peer supports mSBC and the BTIF preferred codec is also mSBC,
      then
      we should set the BTA AG Codec to mSBC. This would trigger a +BCS to mSBC
      at the time
      of SCO connection establishment */
      if ((btif_conf_hf_force_wbs) && (p_data->val.num & BTA_AG_CODEC_MSBC)) {
        BTIF_TRACE_EVENT("%s: btif_hf override-Preferred Codec to MSBC",
                         __func__);
        BTA_AgSetCodec(btif_hf_cb[idx].handle, BTA_AG_CODEC_MSBC);
      } else {
        BTIF_TRACE_EVENT("%s btif_hf override-Preferred Codec to CVSD",
                         __func__);
        BTA_AgSetCodec(btif_hf_cb[idx].handle, BTA_AG_CODEC_CVSD);
      }
      break;
    case BTA_AG_AT_BCS_EVT:
      BTIF_TRACE_DEBUG("%s: AG final selected codec is 0x%02x 1=CVSD 2=MSBC",
                       __func__, p_data->val.num);
      /* No BTHF_WBS_NONE case, because HF1.6 supported device can send BCS */
      /* Only CVSD is considered narrow band speech */
      HAL_CBACK(
          bt_hf_callbacks, wbs_cb,
          (p_data->val.num == BTA_AG_CODEC_CVSD) ? BTHF_WBS_NO : BTHF_WBS_YES,
          &btif_hf_cb[idx].connected_bda);
      break;

    case BTA_AG_AT_BIND_EVT:
      if (p_data->val.hdr.status == BTA_AG_SUCCESS) {
        HAL_CBACK(bt_hf_callbacks, bind_cb, p_data->val.str,
                  &btif_hf_cb[idx].connected_bda);
      }
      break;

    case BTA_AG_AT_BIEV_EVT:
      if (p_data->val.hdr.status == BTA_AG_SUCCESS) {
        HAL_CBACK(bt_hf_callbacks, biev_cb,
                  (bthf_hf_ind_type_t)p_data->val.lidx, (int)p_data->val.num,
                  &btif_hf_cb[idx].connected_bda);
      }
      break;
    default:
      BTIF_TRACE_WARNING("%s: Unhandled event: %d", __func__, event);
      break;
  }
}

/*******************************************************************************
 *
 * Function         bte_hf_evt
 *
 * Description      Switches context from BTE to BTIF for all HF events
 *
 * Returns          void
 *
 ******************************************************************************/

static void bte_hf_evt(tBTA_AG_EVT event, tBTA_AG* p_data) {
  bt_status_t status;
  int param_len = 0;

  /* TODO: BTA sends the union members and not tBTA_AG. If using
   * param_len=sizeof(tBTA_AG), we get a crash on memcpy */
  if (BTA_AG_REGISTER_EVT == event)
    param_len = sizeof(tBTA_AG_REGISTER);
  else if (BTA_AG_OPEN_EVT == event)
    param_len = sizeof(tBTA_AG_OPEN);
  else if (BTA_AG_CONN_EVT == event)
    param_len = sizeof(tBTA_AG_CONN);
  else if ((BTA_AG_CLOSE_EVT == event) || (BTA_AG_AUDIO_OPEN_EVT == event) ||
           (BTA_AG_AUDIO_CLOSE_EVT == event))
    param_len = sizeof(tBTA_AG_HDR);
  else if (p_data)
    param_len = sizeof(tBTA_AG_VAL);

  /* switch context to btif task context (copy full union size for convenience)
   */
  status = btif_transfer_context(btif_hf_upstreams_evt, (uint16_t)event,
                                 (char*)p_data, param_len, NULL);

  /* catch any failed context transfers */
  ASSERTC(status == BT_STATUS_SUCCESS, "context transfer failed", status);
}

/*******************************************************************************
 *
 * Function         btif_in_hf_generic_evt
 *
 * Description     Processes generic events to be sent to JNI that are not
 *                      triggered from the BTA.
 *                      Always runs in BTIF context
 *
 * Returns          void
 *
 ******************************************************************************/
static void btif_in_hf_generic_evt(uint16_t event, char* p_param) {
  int idx = btif_hf_idx_by_bdaddr((RawAddress*)p_param);

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

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return;
  }

  switch (event) {
    case BTIF_HFP_CB_AUDIO_CONNECTING: {
      HAL_CBACK(bt_hf_callbacks, audio_state_cb, BTHF_AUDIO_STATE_CONNECTING,
                &btif_hf_cb[idx].connected_bda);
    } break;
    default: {
      BTIF_TRACE_WARNING("%s : Unknown event 0x%x", __func__, event);
    } break;
  }
}

static bool inband_ringing_property_enabled() {
  char inband_ringing_flag[PROPERTY_VALUE_MAX] = {0};
  osi_property_get("persist.bluetooth.enableinbandringing", inband_ringing_flag,
                   "false");
  if (strncmp(inband_ringing_flag, "true", 4) == 0) {
    BTIF_TRACE_DEBUG("%s: In-band ringing enabled by property", __func__);
    return true;
  }
  return false;
}

/*******************************************************************************
 *
 * Function         btif_hf_init
 *
 * Description     initializes the hf interface
 *
 * Returns         bt_status_t
 *
 ******************************************************************************/
static bt_status_t init(bthf_callbacks_t* callbacks, int max_hf_clients,
                        bool inband_ringing_supported) {
  bool inband_ringing_property_enable = inband_ringing_property_enabled();
  if (inband_ringing_supported && inband_ringing_property_enable) {
    btif_hf_features |= BTA_AG_FEAT_INBAND;
  } else {
    btif_hf_features &= ~BTA_AG_FEAT_INBAND;
  }
  btif_max_hf_clients = max_hf_clients;
  BTIF_TRACE_DEBUG(
      "%s: btif_hf_features=%zu, max_hf_clients=%d, "
      "inband_ringing=[supported=%d, enabled=%d]",
      __func__, btif_hf_features, btif_max_hf_clients, inband_ringing_supported,
      inband_ringing_property_enable);
  bt_hf_callbacks = callbacks;
  memset(&btif_hf_cb, 0, sizeof(btif_hf_cb));

/* Invoke the enable service API to the core to set the appropriate service_id
 * Internally, the HSP_SERVICE_ID shall also be enabled if HFP is enabled
 * (phone)
 * othwerwise only HSP is enabled (tablet)
 */
#if (defined(BTIF_HF_SERVICES) && (BTIF_HF_SERVICES & BTA_HFP_SERVICE_MASK))
  btif_enable_service(BTA_HFP_SERVICE_ID);
#else
  btif_enable_service(BTA_HSP_SERVICE_ID);
#endif

  for (int i = 0; i < btif_max_hf_clients; i++) clear_phone_state_multihf(i);

  return BT_STATUS_SUCCESS;
}

/*******************************************************************************
 *
 * Function         connect
 *
 * Description     connect to headset
 *
 * Returns         bt_status_t
 *
 ******************************************************************************/
static bt_status_t connect_int(RawAddress* bd_addr, uint16_t uuid) {
  CHECK_BTHF_INIT();
  int i;
  for (i = 0; i < btif_max_hf_clients;) {
    if (((btif_hf_cb[i].state == BTHF_CONNECTION_STATE_CONNECTED) ||
         (btif_hf_cb[i].state == BTHF_CONNECTION_STATE_SLC_CONNECTED)))
      i++;
    else
      break;
  }

  if (i == btif_max_hf_clients) return BT_STATUS_BUSY;

  if (!is_connected(bd_addr)) {
    btif_hf_cb[i].state = BTHF_CONNECTION_STATE_CONNECTING;
    btif_hf_cb[i].connected_bda = *bd_addr;

    BTA_AgOpen(btif_hf_cb[i].handle, btif_hf_cb[i].connected_bda,
               BTIF_HF_SECURITY, BTIF_HF_SERVICES);
    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_BUSY;
}

static bt_status_t connect(RawAddress* bd_addr) {
  CHECK_BTHF_INIT();
  return btif_queue_connect(UUID_SERVCLASS_AG_HANDSFREE, bd_addr, connect_int);
}

/*******************************************************************************
 *
 * Function         disconnect
 *
 * Description      disconnect from headset
 *
 * Returns         bt_status_t
 *
 ******************************************************************************/
static bt_status_t disconnect(RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    BTA_AgClose(btif_hf_cb[idx].handle);
    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         connect_audio
 *
 * Description     create an audio connection
 *
 * Returns         bt_status_t
 *
 ******************************************************************************/
static bt_status_t connect_audio(RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  /* Check if SLC is connected */
  if (btif_hf_check_if_slc_connected() != BT_STATUS_SUCCESS)
    return BT_STATUS_NOT_READY;

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    BTA_AgAudioOpen(btif_hf_cb[idx].handle);

    /* Inform the application that the audio connection has been initiated
     * successfully */
    btif_transfer_context(btif_in_hf_generic_evt, BTIF_HFP_CB_AUDIO_CONNECTING,
                          (char*)bd_addr, sizeof(RawAddress), NULL);
    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         disconnect_audio
 *
 * Description      close the audio connection
 *
 * Returns         bt_status_t
 *
 ******************************************************************************/
static bt_status_t disconnect_audio(RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    BTA_AgAudioClose(btif_hf_cb[idx].handle);
    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         start_voice_recognition
 *
 * Description      start voice recognition
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t start_voice_recognition(RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    if (btif_hf_cb[idx].peer_feat & BTA_AG_PEER_FEAT_VREC) {
      tBTA_AG_RES_DATA ag_res;
      memset(&ag_res, 0, sizeof(ag_res));
      ag_res.state = 1;
      BTA_AgResult(btif_hf_cb[idx].handle, BTA_AG_BVRA_RES, &ag_res);

      return BT_STATUS_SUCCESS;
    } else {
      return BT_STATUS_UNSUPPORTED;
    }
  }

  return BT_STATUS_NOT_READY;
}

/*******************************************************************************
 *
 * Function         stop_voice_recognition
 *
 * Description      stop voice recognition
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t stop_voice_recognition(RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    if (btif_hf_cb[idx].peer_feat & BTA_AG_PEER_FEAT_VREC) {
      tBTA_AG_RES_DATA ag_res;
      memset(&ag_res, 0, sizeof(ag_res));
      ag_res.state = 0;
      BTA_AgResult(btif_hf_cb[idx].handle, BTA_AG_BVRA_RES, &ag_res);

      return BT_STATUS_SUCCESS;
    } else {
      return BT_STATUS_UNSUPPORTED;
    }
  }

  return BT_STATUS_NOT_READY;
}

/*******************************************************************************
 *
 * Function         volume_control
 *
 * Description      volume control
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t volume_control(bthf_volume_type_t type, int volume,
                                  RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  tBTA_AG_RES_DATA ag_res;
  memset(&ag_res, 0, sizeof(tBTA_AG_RES_DATA));
  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    ag_res.num = volume;
    BTA_AgResult(
        btif_hf_cb[idx].handle,
        (type == BTHF_VOLUME_TYPE_SPK) ? BTA_AG_SPK_RES : BTA_AG_MIC_RES,
        &ag_res);
    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         device_status_notification
 *
 * Description      Combined device status change notification
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t device_status_notification(bthf_network_state_t ntk_state,
                                              bthf_service_type_t svc_type,
                                              int signal, int batt_chg) {
  CHECK_BTHF_INIT();

  if (is_connected(NULL)) {
    /* send all indicators to BTA.
    ** BTA will make sure no duplicates are sent out
    */
    send_indicator_update(BTA_AG_IND_SERVICE,
                          (ntk_state == BTHF_NETWORK_STATE_AVAILABLE) ? 1 : 0);
    send_indicator_update(BTA_AG_IND_ROAM,
                          (svc_type == BTHF_SERVICE_TYPE_HOME) ? 0 : 1);
    send_indicator_update(BTA_AG_IND_SIGNAL, signal);
    send_indicator_update(BTA_AG_IND_BATTCHG, batt_chg);
    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_SUCCESS;
}

/*******************************************************************************
 *
 * Function         cops_response
 *
 * Description      Response for COPS command
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t cops_response(const char* cops, RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    tBTA_AG_RES_DATA ag_res;

    /* Format the response */
    snprintf(ag_res.str, sizeof(ag_res.str), "0,0,\"%.16s\"", cops);
    ag_res.ok_flag = BTA_AG_OK_DONE;

    BTA_AgResult(btif_hf_cb[idx].handle, BTA_AG_COPS_RES, &ag_res);
    return BT_STATUS_SUCCESS;
  }
  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         cind_response
 *
 * Description      Response for CIND command
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t cind_response(int svc, int num_active, int num_held,
                                 bthf_call_state_t call_setup_state, int signal,
                                 int roam, int batt_chg, RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    tBTA_AG_RES_DATA ag_res;

    memset(&ag_res, 0, sizeof(ag_res));
    /* per the errata 2043, call=1 implies atleast one call is in progress
     *(active/held)
     ** https://www.bluetooth.org/errata/errata_view.cfm?errata_id=2043
     **/
    snprintf(
        ag_res.str, sizeof(ag_res.str), "%d,%d,%d,%d,%d,%d,%d",
        (num_active + num_held) ? 1 : 0,          /* Call state */
        callstate_to_callsetup(call_setup_state), /* Callsetup state */
        svc,                                      /* network service */
        signal,                                   /* Signal strength */
        roam,                                     /* Roaming indicator */
        batt_chg,                                 /* Battery level */
        ((num_held == 0) ? 0 : ((num_active == 0) ? 2 : 1))); /* Call held */

    BTA_AgResult(btif_hf_cb[idx].handle, BTA_AG_CIND_RES, &ag_res);

    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         bind_response
 *
 * Description      Send +BIND response
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t bind_response(bthf_hf_ind_type_t ind_id,
                                 bthf_hf_ind_status_t ind_status,
                                 RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int index = btif_hf_idx_by_bdaddr(bd_addr);
  if (!is_connected(bd_addr) || index == BTIF_HF_INVALID_IDX)
    return BT_STATUS_FAIL;

  tBTA_AG_RES_DATA ag_res;
  memset(&ag_res, 0, sizeof(ag_res));
  ag_res.ind.id = ind_id;
  ag_res.ind.on_demand = (ind_status == BTHF_HF_IND_ENABLED);

  BTA_AgResult(btif_hf_cb[index].handle, BTA_AG_BIND_RES, &ag_res);
  return BT_STATUS_SUCCESS;
}

static bt_status_t set_sco_allowed(bool value) {
  CHECK_BTHF_INIT();

  BTA_AgSetScoAllowed(value);
  return BT_STATUS_SUCCESS;
}

/*******************************************************************************
 *
 * Function         formatted_at_response
 *
 * Description      Pre-formatted AT response, typically in response to unknown
 *                  AT cmd
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t formatted_at_response(const char* rsp, RawAddress* bd_addr) {
  CHECK_BTHF_INIT();
  tBTA_AG_RES_DATA ag_res;
  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    /* Format the response and send */
    memset(&ag_res, 0, sizeof(ag_res));
    strncpy(ag_res.str, rsp, BTA_AG_AT_MAX_LEN);
    BTA_AgResult(btif_hf_cb[idx].handle, BTA_AG_UNAT_RES, &ag_res);

    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         at_response
 *
 * Description      ok/error response
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t at_response(bthf_at_response_t response_code, int error_code,
                               RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    send_at_result((response_code == BTHF_AT_RESPONSE_OK) ? BTA_AG_OK_DONE
                                                          : BTA_AG_OK_ERROR,
                   error_code, idx);
    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         clcc_response
 *
 * Description      response for CLCC command
 *                  Can be iteratively called for each call index. Call index
 *                  of 0 will be treated as NULL termination (Completes
 *                  response)
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t clcc_response(int index, bthf_call_direction_t dir,
                                 bthf_call_state_t state, bthf_call_mode_t mode,
                                 bthf_call_mpty_type_t mpty, const char* number,
                                 bthf_call_addrtype_t type,
                                 RawAddress* bd_addr) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  if (is_connected(bd_addr) && (idx != BTIF_HF_INVALID_IDX)) {
    tBTA_AG_RES_DATA ag_res;
    memset(&ag_res, 0, sizeof(ag_res));

    /* Format the response */
    if (index == 0) {
      ag_res.ok_flag = BTA_AG_OK_DONE;
    } else {
      BTIF_TRACE_EVENT(
          "clcc_response: [%d] dir %d state %d mode %d number = %s type = %d",
          index, dir, state, mode, number, type);
      int res_strlen =
          snprintf(ag_res.str, sizeof(ag_res.str), "%d,%d,%d,%d,%d", index, dir,
                   state, mode, mpty);

      if (number) {
        size_t rem_bytes = sizeof(ag_res.str) - res_strlen;
        char dialnum[sizeof(ag_res.str)];
        size_t newidx = 0;
        if (type == BTHF_CALL_ADDRTYPE_INTERNATIONAL && *number != '+') {
          dialnum[newidx++] = '+';
        }
        for (size_t i = 0; number[i] != 0; i++) {
          if (utl_isdialchar(number[i])) {
            dialnum[newidx++] = number[i];
          }
        }
        dialnum[newidx] = 0;
        snprintf(&ag_res.str[res_strlen], rem_bytes, ",\"%s\",%d", dialnum,
                 type);
      }
    }
    BTA_AgResult(btif_hf_cb[idx].handle, BTA_AG_CLCC_RES, &ag_res);

    return BT_STATUS_SUCCESS;
  }

  return BT_STATUS_FAIL;
}

/*******************************************************************************
 *
 * Function         phone_state_change
 *
 * Description      notify of a call state change
 *                  number & type: valid only for incoming & waiting call
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/

static bt_status_t phone_state_change(int num_active, int num_held,
                                      bthf_call_state_t call_setup_state,
                                      const char* number,
                                      bthf_call_addrtype_t type) {
  tBTA_AG_RES res = 0xff;
  tBTA_AG_RES_DATA ag_res;
  bt_status_t status = BT_STATUS_SUCCESS;
  bool activeCallUpdated = false;
  int idx, i;

  /* hf_idx is index of connected HS that sent ATA/BLDN,
          otherwise index of latest connected HS */
  if (hf_idx != BTIF_HF_INVALID_IDX)
    idx = hf_idx;
  else
    idx = btif_hf_latest_connected_idx();

  BTIF_TRACE_DEBUG("phone_state_change: idx = %d", idx);

  /* Check if SLC is connected */
  if (btif_hf_check_if_slc_connected() != BT_STATUS_SUCCESS)
    return BT_STATUS_NOT_READY;

  BTIF_TRACE_DEBUG(
      "phone_state_change: num_active=%d [prev: %d]  num_held=%d[prev: %d]"
      " call_setup=%s [prev: %s]",
      num_active, btif_hf_cb[idx].num_active, num_held,
      btif_hf_cb[idx].num_held, dump_hf_call_state(call_setup_state),
      dump_hf_call_state(btif_hf_cb[idx].call_setup_state));

  /* if all indicators are 0, send end call and return */
  if (num_active == 0 && num_held == 0 &&
      call_setup_state == BTHF_CALL_STATE_IDLE) {
    BTIF_TRACE_DEBUG("%s: Phone on hook", __func__);

    /* record call termination timestamp  if  there was an active/held call  or
               callsetup state > BTHF_CALL_STATE_IDLE */
    if ((btif_hf_cb[idx].call_setup_state != BTHF_CALL_STATE_IDLE) ||
        (btif_hf_cb[idx].num_active) || (btif_hf_cb[idx].num_held)) {
      BTIF_TRACE_DEBUG("%s: Record call termination timestamp", __func__);
      clock_gettime(CLOCK_MONOTONIC, &btif_hf_cb[0].call_end_timestamp);
    }
    BTA_AgResult(BTA_AG_HANDLE_ALL, BTA_AG_END_CALL_RES, NULL);
    hf_idx = BTIF_HF_INVALID_IDX;

    /* if held call was present, reset that as well */
    if (btif_hf_cb[idx].num_held) send_indicator_update(BTA_AG_IND_CALLHELD, 0);

    goto update_call_states;
  }

  /* active state can change when:
  ** 1. an outgoing/incoming call was answered
  ** 2. an held was resumed
  ** 3. without callsetup notifications, call became active
  ** (3) can happen if call is active and a headset connects to us
  **
  ** In the case of (3), we will have to notify the stack of an active
  ** call, instead of sending an indicator update. This will also
  ** force the SCO to be setup. Handle this special case here prior to
  ** call setup handling
  */
  if (((num_active + num_held) > 0) && (btif_hf_cb[idx].num_active == 0) &&
      (btif_hf_cb[idx].num_held == 0) &&
      (btif_hf_cb[idx].call_setup_state == BTHF_CALL_STATE_IDLE)) {
    BTIF_TRACE_DEBUG(
        "%s: Active/Held call notification received without call setup update",
        __func__);

    memset(&ag_res, 0, sizeof(tBTA_AG_RES_DATA));
    ag_res.audio_handle = BTA_AG_HANDLE_SCO_NO_CHANGE;
    /* Addition call setup with the Active call
    ** CIND response should have been updated.
    ** just open SCO connection.
    */
    if (call_setup_state != BTHF_CALL_STATE_IDLE)
      res = BTA_AG_MULTI_CALL_RES;
    else
      res = BTA_AG_OUT_CALL_CONN_RES;
    BTA_AgResult(BTA_AG_HANDLE_ALL, res, &ag_res);
    activeCallUpdated = true;
  }

  /* Ringing call changed? */
  if (call_setup_state != btif_hf_cb[idx].call_setup_state) {
    BTIF_TRACE_DEBUG("%s: Call setup states changed. old: %s new: %s", __func__,
                     dump_hf_call_state(btif_hf_cb[idx].call_setup_state),
                     dump_hf_call_state(call_setup_state));
    memset(&ag_res, 0, sizeof(tBTA_AG_RES_DATA));

    switch (call_setup_state) {
      case BTHF_CALL_STATE_IDLE: {
        switch (btif_hf_cb[idx].call_setup_state) {
          case BTHF_CALL_STATE_INCOMING:
            if (num_active > btif_hf_cb[idx].num_active) {
              res = BTA_AG_IN_CALL_CONN_RES;
              ag_res.audio_handle = btif_hf_cb[idx].handle;
            } else if (num_held > btif_hf_cb[idx].num_held)
              res = BTA_AG_IN_CALL_HELD_RES;
            else
              res = BTA_AG_CALL_CANCEL_RES;
            break;
          case BTHF_CALL_STATE_DIALING:
          case BTHF_CALL_STATE_ALERTING:
            if (num_active > btif_hf_cb[idx].num_active) {
              ag_res.audio_handle = BTA_AG_HANDLE_SCO_NO_CHANGE;
              res = BTA_AG_OUT_CALL_CONN_RES;
            } else
              res = BTA_AG_CALL_CANCEL_RES;
            break;
          default:
            BTIF_TRACE_ERROR("%s: Incorrect Call setup state transition",
                             __func__);
            status = BT_STATUS_PARM_INVALID;
            break;
        }
      } break;

      case BTHF_CALL_STATE_INCOMING:
        if (num_active || num_held) {
          res = BTA_AG_CALL_WAIT_RES;
        } else {
          res = BTA_AG_IN_CALL_RES;
        }
        if (number) {
          int xx = 0;
          if ((type == BTHF_CALL_ADDRTYPE_INTERNATIONAL) && (*number != '+'))
            xx = snprintf(ag_res.str, sizeof(ag_res.str), "\"+%s\"", number);
          else
            xx = snprintf(ag_res.str, sizeof(ag_res.str), "\"%s\"", number);
          ag_res.num = type;

          if (res == BTA_AG_CALL_WAIT_RES)
            snprintf(&ag_res.str[xx], sizeof(ag_res.str) - xx, ",%d", type);
        }
        break;
      case BTHF_CALL_STATE_DIALING:
        if (!(num_active + num_held))
          ag_res.audio_handle = btif_hf_cb[idx].handle;
        res = BTA_AG_OUT_CALL_ORIG_RES;
        break;
      case BTHF_CALL_STATE_ALERTING:
        /* if we went from idle->alert, force SCO setup here. dialing usually
         * triggers it */
        if ((btif_hf_cb[idx].call_setup_state == BTHF_CALL_STATE_IDLE) &&
            !(num_active + num_held))
          ag_res.audio_handle = btif_hf_cb[idx].handle;
        res = BTA_AG_OUT_CALL_ALERT_RES;
        break;
      default:
        BTIF_TRACE_ERROR("%s: Incorrect new ringing call state", __func__);
        status = BT_STATUS_PARM_INVALID;
        break;
    }
    BTIF_TRACE_DEBUG("%s: Call setup state changed. res=%d, audio_handle=%d",
                     __func__, res, ag_res.audio_handle);

    if (res) BTA_AgResult(BTA_AG_HANDLE_ALL, res, &ag_res);

    /* if call setup is idle, we have already updated call indicator, jump out
     */
    if (call_setup_state == BTHF_CALL_STATE_IDLE) {
      /* check & update callheld */
      if ((num_held > 0) && (num_active > 0))
        send_indicator_update(BTA_AG_IND_CALLHELD, 1);
      goto update_call_states;
    }
  }

  memset(&ag_res, 0, sizeof(tBTA_AG_RES_DATA));

  /* per the errata 2043, call=1 implies atleast one call is in progress
   *(active/held)
   ** https://www.bluetooth.org/errata/errata_view.cfm?errata_id=2043
   ** Handle call indicator change
   **/
  if (!activeCallUpdated &&
      ((num_active + num_held) !=
       (btif_hf_cb[idx].num_active + btif_hf_cb[idx].num_held))) {
    BTIF_TRACE_DEBUG("%s: Active call states changed. old: %d new: %d",
                     __func__, btif_hf_cb[idx].num_active, num_active);
    send_indicator_update(BTA_AG_IND_CALL,
                          ((num_active + num_held) > 0) ? 1 : 0);
  }

  /* Held Changed? */
  if (num_held != btif_hf_cb[idx].num_held ||
      ((num_active == 0) && ((num_held + btif_hf_cb[idx].num_held) > 1))) {
    BTIF_TRACE_DEBUG("%s: Held call states changed. old: %d new: %d", __func__,
                     btif_hf_cb[idx].num_held, num_held);
    send_indicator_update(BTA_AG_IND_CALLHELD,
                          ((num_held == 0) ? 0 : ((num_active == 0) ? 2 : 1)));
  }

  /* Calls Swapped? */
  if ((call_setup_state == btif_hf_cb[idx].call_setup_state) &&
      (num_active && num_held) && (num_active == btif_hf_cb[idx].num_active) &&
      (num_held == btif_hf_cb[idx].num_held)) {
    BTIF_TRACE_DEBUG("%s: Calls swapped", __func__);
    send_indicator_update(BTA_AG_IND_CALLHELD, 1);
  }

update_call_states:
  for (i = 0; i < btif_max_hf_clients; i++) {
    if (btif_hf_cb[i].state == BTHF_CONNECTION_STATE_SLC_CONNECTED) {
      btif_hf_cb[i].num_active = num_active;
      btif_hf_cb[i].num_held = num_held;
      btif_hf_cb[i].call_setup_state = call_setup_state;
    }
  }
  return status;
}

/*******************************************************************************
 *
 * Function         btif_hf_is_call_idle
 *
 * Description      returns true if no call is in progress
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
bool btif_hf_is_call_idle(void) {
  if (bt_hf_callbacks == NULL) return true;

  for (int i = 0; i < btif_max_hf_clients; ++i) {
    if ((btif_hf_cb[i].call_setup_state != BTHF_CALL_STATE_IDLE) ||
        ((btif_hf_cb[i].num_held + btif_hf_cb[i].num_active) > 0))
      return false;
  }

  return true;
}

/*******************************************************************************
 *
 * Function         btif_hf_call_terminated_recently
 *
 * Description      Checks if a call has been terminated
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
bool btif_hf_call_terminated_recently() {
  struct timespec now;

  clock_gettime(CLOCK_MONOTONIC, &now);
  if (now.tv_sec <
      btif_hf_cb[0].call_end_timestamp.tv_sec + BTIF_HF_CALL_END_TIMEOUT) {
    return true;
  } else {
    btif_hf_cb[0].call_end_timestamp.tv_sec = 0;
    return false;
  }
}

/*******************************************************************************
 *
 * Function         cleanup
 *
 * Description      Closes the HF interface
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static void cleanup(void) {
  BTIF_TRACE_EVENT("%s", __func__);

  btif_queue_cleanup(UUID_SERVCLASS_AG_HANDSFREE);
  if (bt_hf_callbacks) {
#if (defined(BTIF_HF_SERVICES) && (BTIF_HF_SERVICES & BTA_HFP_SERVICE_MASK))
    btif_disable_service(BTA_HFP_SERVICE_ID);
#else
    btif_disable_service(BTA_HSP_SERVICE_ID);
#endif
    bt_hf_callbacks = NULL;
  }
}

/*******************************************************************************
 *
 * Function         configure_wbs
 *
 * Description      set to over-ride the current WBS configuration.
 *                  It will not send codec setting cmd to the controller now.
 *                  It just change the configure.
 *
 * Returns          bt_status_t
 *
 ******************************************************************************/
static bt_status_t configure_wbs(RawAddress* bd_addr,
                                 bthf_wbs_config_t config) {
  CHECK_BTHF_INIT();

  int idx = btif_hf_idx_by_bdaddr(bd_addr);

  if ((idx < 0) || (idx >= BTIF_HF_NUM_CB)) {
    BTIF_TRACE_ERROR("%s: Invalid index %d", __func__, idx);
    return BT_STATUS_FAIL;
  }

  BTIF_TRACE_EVENT("%s config is %d", __func__, config);
  if (config == BTHF_WBS_YES)
    BTA_AgSetCodec(btif_hf_cb[idx].handle, BTA_AG_CODEC_MSBC);
  else if (config == BTHF_WBS_NO)
    BTA_AgSetCodec(btif_hf_cb[idx].handle, BTA_AG_CODEC_CVSD);
  else
    BTA_AgSetCodec(btif_hf_cb[idx].handle, BTA_AG_CODEC_NONE);

  return BT_STATUS_SUCCESS;
}

static const bthf_interface_t bthfInterface = {
    sizeof(bthfInterface),
    init,
    connect,
    disconnect,
    connect_audio,
    disconnect_audio,
    start_voice_recognition,
    stop_voice_recognition,
    volume_control,
    device_status_notification,
    cops_response,
    cind_response,
    formatted_at_response,
    at_response,
    clcc_response,
    phone_state_change,
    cleanup,
    configure_wbs,
    bind_response,
    set_sco_allowed,
};

/*******************************************************************************
 *
 * Function         btif_hf_execute_service
 *
 * Description      Initializes/Shuts down the service
 *
 * Returns          BT_STATUS_SUCCESS on success, BT_STATUS_FAIL otherwise
 *
 ******************************************************************************/
bt_status_t btif_hf_execute_service(bool b_enable) {
  const char* p_service_names[] = BTIF_HF_SERVICE_NAMES;
  int i;
  if (b_enable) {
    /* Enable and register with BTA-AG */
    BTA_AgEnable(BTA_AG_PARSE, bte_hf_evt);
    for (i = 0; i < btif_max_hf_clients; i++) {
      BTA_AgRegister(BTIF_HF_SERVICES, BTIF_HF_SECURITY, btif_hf_features,
                     p_service_names, bthf_hf_id[i]);
    }
  } else {
    /* De-register AG */
    for (i = 0; i < btif_max_hf_clients; i++) {
      BTA_AgDeregister(btif_hf_cb[i].handle);
    }
    /* Disable AG */
    BTA_AgDisable();
  }
  return BT_STATUS_SUCCESS;
}

/*******************************************************************************
 *
 * Function         btif_hf_get_interface
 *
 * Description      Get the hf callback interface
 *
 * Returns          bthf_interface_t
 *
 ******************************************************************************/
const bthf_interface_t* btif_hf_get_interface() {
  BTIF_TRACE_EVENT("%s", __func__);
  return &bthfInterface;
}