bta/ag/bta_ag_act.cc

/******************************************************************************
 *
 *  Copyright (C) 2003-2012 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.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  This file contains action functions for the audio gateway.
 *
 ******************************************************************************/

#include <string.h>

#include "bta_ag_api.h"
#include "bta_ag_co.h"
#include "bta_ag_int.h"
#include "bta_api.h"
#include "bta_dm_api.h"
#include "bta_sys.h"
#include "l2c_api.h"
#include "osi/include/osi.h"
#include "port_api.h"
#include "utl.h"

/*****************************************************************************
 *  Constants
 ****************************************************************************/

/* maximum length of data to read from RFCOMM */
#define BTA_AG_RFC_READ_MAX 512

/* maximum AT command length */
#define BTA_AG_CMD_MAX 512

const uint16_t bta_ag_uuid[BTA_AG_NUM_IDX] = {
    UUID_SERVCLASS_HEADSET_AUDIO_GATEWAY, UUID_SERVCLASS_AG_HANDSFREE};

const uint8_t bta_ag_sec_id[BTA_AG_NUM_IDX] = {BTM_SEC_SERVICE_HEADSET_AG,
                                               BTM_SEC_SERVICE_AG_HANDSFREE};

const tBTA_SERVICE_ID bta_ag_svc_id[BTA_AG_NUM_IDX] = {BTA_HSP_SERVICE_ID,
                                                       BTA_HFP_SERVICE_ID};

const tBTA_SERVICE_MASK bta_ag_svc_mask[BTA_AG_NUM_IDX] = {
    BTA_HSP_SERVICE_MASK, BTA_HFP_SERVICE_MASK};

typedef void (*tBTA_AG_ATCMD_CBACK)(tBTA_AG_SCB* p_scb, uint16_t cmd,
                                    uint8_t arg_type, char* p_arg,
                                    int16_t int_arg);

const tBTA_AG_ATCMD_CBACK bta_ag_at_cback_tbl[BTA_AG_NUM_IDX] = {
    bta_ag_at_hsp_cback, bta_ag_at_hfp_cback};

/*******************************************************************************
 *
 * Function         bta_ag_cback_open
 *
 * Description      Send open callback event to application.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
static void bta_ag_cback_open(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data,
                              tBTA_AG_STATUS status) {
  tBTA_AG_OPEN open;

  /* call app callback with open event */
  open.hdr.handle = bta_ag_scb_to_idx(p_scb);
  open.hdr.app_id = p_scb->app_id;
  open.status = status;
  open.service_id = bta_ag_svc_id[p_scb->conn_service];
  if (p_data) {
    /* if p_data is provided then we need to pick the bd address from the open
     * api structure */
    open.bd_addr = p_data->api_open.bd_addr;
  } else {
    open.bd_addr = p_scb->peer_addr;
  }

  (*bta_ag_cb.p_cback)(BTA_AG_OPEN_EVT, (tBTA_AG*)&open);
}

/*******************************************************************************
 *
 * Function         bta_ag_register
 *
 * Description      This function initializes values of the AG cb and sets up
 *                  the SDP record for the services.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_register(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  tBTA_AG_REGISTER reg;

  /* initialize control block */
  p_scb->reg_services = p_data->api_register.services;
  p_scb->serv_sec_mask = p_data->api_register.sec_mask;
  p_scb->features = p_data->api_register.features;
  p_scb->app_id = p_data->api_register.app_id;

  /* create SDP records */
  bta_ag_create_records(p_scb, p_data);

  /* start RFCOMM servers */
  bta_ag_start_servers(p_scb, p_scb->reg_services);

  /* call app callback with register event */
  reg.hdr.handle = bta_ag_scb_to_idx(p_scb);
  reg.hdr.app_id = p_scb->app_id;
  reg.status = BTA_AG_SUCCESS;
  (*bta_ag_cb.p_cback)(BTA_AG_REGISTER_EVT, (tBTA_AG*)&reg);
}

/*******************************************************************************
 *
 * Function         bta_ag_deregister
 *
 * Description      This function removes the sdp records, closes the RFCOMM
 *                  servers, and deallocates the service control block.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_deregister(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  /* set dealloc */
  p_scb->dealloc = true;

  /* remove sdp records */
  bta_ag_del_records(p_scb, p_data);

  /* remove rfcomm servers */
  bta_ag_close_servers(p_scb, p_scb->reg_services);

  /* dealloc */
  bta_ag_scb_dealloc(p_scb);
}

/*******************************************************************************
 *
 * Function         bta_ag_start_dereg
 *
 * Description      Start a deregister event.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_start_dereg(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  /* set dealloc */
  p_scb->dealloc = true;

  /* remove sdp records */
  bta_ag_del_records(p_scb, p_data);
}

/*******************************************************************************
 *
 * Function         bta_ag_start_open
 *
 * Description      This starts an AG open.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_start_open(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  RawAddress pending_bd_addr;

  /* store parameters */
  if (p_data) {
    p_scb->peer_addr = p_data->api_open.bd_addr;
    p_scb->open_services = p_data->api_open.services;
    p_scb->cli_sec_mask = p_data->api_open.sec_mask;
  }

  /* Check if RFCOMM has any incoming connection to avoid collision. */
  if (PORT_IsOpening(pending_bd_addr)) {
    /* Let the incoming connection goes through.                        */
    /* Issue collision for this scb for now.                            */
    /* We will decide what to do when we find incoming connetion later. */
    bta_ag_collision_cback(0, BTA_ID_AG, 0, &p_scb->peer_addr);
    return;
  }

  /* close servers */
  bta_ag_close_servers(p_scb, p_scb->reg_services);

  /* set role */
  p_scb->role = BTA_AG_INT;

  /* do service search */
  bta_ag_do_disc(p_scb, p_scb->open_services);
}

/*******************************************************************************
 *
 * Function         bta_ag_disc_int_res
 *
 * Description      This function handles a discovery result when initiator.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_disc_int_res(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  uint16_t event = BTA_AG_DISC_FAIL_EVT;

  APPL_TRACE_DEBUG("bta_ag_disc_int_res: Status: %d",
                   p_data->disc_result.status);

  /* if found service */
  if (p_data->disc_result.status == SDP_SUCCESS ||
      p_data->disc_result.status == SDP_DB_FULL) {
    /* get attributes */
    if (bta_ag_sdp_find_attr(p_scb, p_scb->open_services)) {
      /* set connected service */
      p_scb->conn_service = bta_ag_service_to_idx(p_scb->open_services);

      /* send ourselves sdp ok event */
      event = BTA_AG_DISC_OK_EVT;
    }
  }

  /* free discovery db */
  bta_ag_free_db(p_scb, p_data);

  /* if service not found check if we should search for other service */
  if ((event == BTA_AG_DISC_FAIL_EVT) &&
      (p_data->disc_result.status == SDP_SUCCESS ||
       p_data->disc_result.status == SDP_DB_FULL ||
       p_data->disc_result.status == SDP_NO_RECS_MATCH)) {
    if ((p_scb->open_services & BTA_HFP_SERVICE_MASK) &&
        (p_scb->open_services & BTA_HSP_SERVICE_MASK)) {
      /* search for HSP */
      p_scb->open_services &= ~BTA_HFP_SERVICE_MASK;
      bta_ag_do_disc(p_scb, p_scb->open_services);
    } else if ((p_scb->open_services & BTA_HSP_SERVICE_MASK) &&
               (p_scb->hsp_version == HSP_VERSION_1_2)) {
      /* search for UUID_SERVCLASS_HEADSET instead */
      p_scb->hsp_version = HSP_VERSION_1_0;
      bta_ag_do_disc(p_scb, p_scb->open_services);
    } else {
      /* send ourselves sdp ok/fail event */
      bta_ag_sm_execute(p_scb, event, p_data);
    }
  } else {
    /* send ourselves sdp ok/fail event */
    bta_ag_sm_execute(p_scb, event, p_data);
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_disc_acp_res
 *
 * Description      This function handles a discovery result when acceptor.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_disc_acp_res(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  /* if found service */
  if (p_data->disc_result.status == SDP_SUCCESS ||
      p_data->disc_result.status == SDP_DB_FULL) {
    /* get attributes */
    bta_ag_sdp_find_attr(p_scb, bta_ag_svc_mask[p_scb->conn_service]);
  }

  /* free discovery db */
  bta_ag_free_db(p_scb, p_data);
}

/*******************************************************************************
 *
 * Function         bta_ag_disc_fail
 *
 * Description      This function handles a discovery failure.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_disc_fail(tBTA_AG_SCB* p_scb, UNUSED_ATTR tBTA_AG_DATA* p_data) {
  /* reopen registered servers */
  bta_ag_start_servers(p_scb, p_scb->reg_services);

  /* reinitialize stuff */

  /* clear the remote BD address */
  p_scb->peer_addr = RawAddress::kEmpty;

  /* call open cback w. failure */
  bta_ag_cback_open(p_scb, NULL, BTA_AG_FAIL_SDP);
}

/*******************************************************************************
 *
 * Function         bta_ag_open_fail
 *
 * Description      open connection failed.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_open_fail(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  /* call open cback w. failure */
  bta_ag_cback_open(p_scb, p_data, BTA_AG_FAIL_RESOURCES);
}

/*******************************************************************************
 *
 * Function         bta_ag_rfc_fail
 *
 * Description      RFCOMM connection failed.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_rfc_fail(tBTA_AG_SCB* p_scb, UNUSED_ATTR tBTA_AG_DATA* p_data) {
  /* reinitialize stuff */
  p_scb->conn_handle = 0;
  p_scb->conn_service = 0;
  p_scb->peer_features = 0;
  p_scb->peer_codecs = BTA_AG_CODEC_CVSD;
  p_scb->sco_codec = BTA_AG_CODEC_CVSD;
  p_scb->role = 0;
  p_scb->svc_conn = false;
  p_scb->hsp_version = HSP_VERSION_1_2;
  /*Clear the BD address*/
  p_scb->peer_addr = RawAddress::kEmpty;

  /* reopen registered servers */
  bta_ag_start_servers(p_scb, p_scb->reg_services);

  /* call open cback w. failure */
  bta_ag_cback_open(p_scb, NULL, BTA_AG_FAIL_RFCOMM);
}

/*******************************************************************************
 *
 * Function         bta_ag_rfc_close
 *
 * Description      RFCOMM connection closed.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_rfc_close(tBTA_AG_SCB* p_scb, UNUSED_ATTR tBTA_AG_DATA* p_data) {
  tBTA_AG_CLOSE close;
  tBTA_SERVICE_MASK services;
  int i, num_active_conn = 0;

  /* reinitialize stuff */
  p_scb->conn_service = 0;
  p_scb->peer_features = 0;
  p_scb->peer_codecs = BTA_AG_CODEC_CVSD;
  p_scb->sco_codec = BTA_AG_CODEC_CVSD;
  /* Clear these flags upon SLC teardown */
  p_scb->codec_updated = false;
  p_scb->codec_fallback = false;
  p_scb->codec_msbc_settings = BTA_AG_SCO_MSBC_SETTINGS_T2;
  p_scb->role = 0;
  p_scb->post_sco = BTA_AG_POST_SCO_NONE;
  p_scb->svc_conn = false;
  p_scb->hsp_version = HSP_VERSION_1_2;
  bta_ag_at_reinit(&p_scb->at_cb);

  memset(&(p_scb->peer_hf_indicators), 0, sizeof(p_scb->peer_hf_indicators));
  memset(&(p_scb->local_hf_indicators), 0, sizeof(p_scb->local_hf_indicators));

  /* stop timers */
  alarm_cancel(p_scb->ring_timer);
  alarm_cancel(p_scb->codec_negotiation_timer);

  close.hdr.handle = bta_ag_scb_to_idx(p_scb);
  close.hdr.app_id = p_scb->app_id;
  close.bd_addr = p_scb->peer_addr;

  bta_sys_conn_close(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);

  /* call close call-out */
  bta_ag_co_data_close(close.hdr.handle);

  /* call close cback */
  (*bta_ag_cb.p_cback)(BTA_AG_CLOSE_EVT, (tBTA_AG*)&close);

  /* if not deregistering (deallocating) reopen registered servers */
  if (p_scb->dealloc == false) {
    /* Clear peer bd_addr so instance can be reused */
    p_scb->peer_addr = RawAddress::kEmpty;

    /* start only unopened server */
    services = p_scb->reg_services;
    for (i = 0; i < BTA_AG_NUM_IDX && services != 0; i++) {
      if (p_scb->serv_handle[i])
        services &= ~((tBTA_SERVICE_MASK)1 << (BTA_HSP_SERVICE_ID + i));
    }
    bta_ag_start_servers(p_scb, services);

    p_scb->conn_handle = 0;

    /* Make sure SCO state is BTA_AG_SCO_SHUTDOWN_ST */
    bta_ag_sco_shutdown(p_scb, NULL);

    /* Check if all the SLCs are down */
    for (i = 0; i < BTA_AG_NUM_SCB; i++) {
      if (bta_ag_cb.scb[i].in_use && bta_ag_cb.scb[i].svc_conn)
        num_active_conn++;
    }

    if (!num_active_conn) {
      bta_sys_sco_unuse(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);
    }

  }
  /* else close port and deallocate scb */
  else {
    RFCOMM_RemoveServer(p_scb->conn_handle);
    bta_ag_scb_dealloc(p_scb);
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_rfc_open
 *
 * Description      Handle RFCOMM channel open.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_rfc_open(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  /* initialize AT feature variables */
  p_scb->clip_enabled = false;
  p_scb->ccwa_enabled = false;
  p_scb->cmer_enabled = false;
  p_scb->cmee_enabled = false;
  p_scb->inband_enabled =
      ((p_scb->features & BTA_AG_FEAT_INBAND) == BTA_AG_FEAT_INBAND);

  /* set up AT command interpreter */
  p_scb->at_cb.p_at_tbl = (tBTA_AG_AT_CMD*)bta_ag_at_tbl[p_scb->conn_service];
  p_scb->at_cb.p_cmd_cback =
      (tBTA_AG_AT_CMD_CBACK*)bta_ag_at_cback_tbl[p_scb->conn_service];
  p_scb->at_cb.p_err_cback = (tBTA_AG_AT_ERR_CBACK*)bta_ag_at_err_cback;
  p_scb->at_cb.p_user = p_scb;
  p_scb->at_cb.cmd_max_len = BTA_AG_CMD_MAX;
  bta_ag_at_init(&p_scb->at_cb);

  /* call app open call-out */
  bta_ag_co_data_open(bta_ag_scb_to_idx(p_scb),
                      bta_ag_svc_id[p_scb->conn_service]);

  bta_sys_conn_open(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);

  bta_ag_cback_open(p_scb, NULL, BTA_AG_SUCCESS);

  if (p_scb->conn_service == BTA_AG_HFP) {
    /* if hfp start timer for service level conn */
    bta_sys_start_timer(p_scb->ring_timer, p_bta_ag_cfg->conn_tout,
                        BTA_AG_SVC_TIMEOUT_EVT, bta_ag_scb_to_idx(p_scb));
  } else {
    /* else service level conn is open */
    bta_ag_svc_conn_open(p_scb, p_data);
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_rfc_acp_open
 *
 * Description      Handle RFCOMM channel open when accepting connection.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_rfc_acp_open(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  uint16_t lcid;
  int i;
  tBTA_AG_SCB *ag_scb, *other_scb;
  RawAddress dev_addr;
  int status;

  /* set role */
  p_scb->role = BTA_AG_ACP;

  APPL_TRACE_DEBUG("bta_ag_rfc_acp_open: serv_handle0 = %d serv_handle1 = %d",
                   p_scb->serv_handle[0], p_scb->serv_handle[1]);

  /* get bd addr of peer */
  if (PORT_SUCCESS != (status = PORT_CheckConnection(p_data->rfc.port_handle,
                                                     dev_addr, &lcid))) {
    APPL_TRACE_DEBUG(
        "bta_ag_rfc_acp_open error PORT_CheckConnection returned status %d",
        status);
  }

  /* Collision Handling */
  for (i = 0, ag_scb = &bta_ag_cb.scb[0]; i < BTA_AG_NUM_SCB; i++, ag_scb++) {
    if (ag_scb->in_use && alarm_is_scheduled(ag_scb->collision_timer)) {
      alarm_cancel(ag_scb->collision_timer);

      if (dev_addr == ag_scb->peer_addr) {
        /* If incoming and outgoing device are same, nothing more to do. */
        /* Outgoing conn will be aborted because we have successful incoming
         * conn.  */
      } else {
        /* Resume outgoing connection. */
        other_scb = bta_ag_get_other_idle_scb(p_scb);
        if (other_scb) {
          other_scb->peer_addr = ag_scb->peer_addr;
          other_scb->open_services = ag_scb->open_services;
          other_scb->cli_sec_mask = ag_scb->cli_sec_mask;

          bta_ag_resume_open(other_scb);
        }
      }

      break;
    }
  }

  p_scb->peer_addr = dev_addr;

  /* determine connected service from port handle */
  for (i = 0; i < BTA_AG_NUM_IDX; i++) {
    APPL_TRACE_DEBUG(
        "bta_ag_rfc_acp_open: i = %d serv_handle = %d port_handle = %d", i,
        p_scb->serv_handle[i], p_data->rfc.port_handle);

    if (p_scb->serv_handle[i] == p_data->rfc.port_handle) {
      p_scb->conn_service = i;
      p_scb->conn_handle = p_data->rfc.port_handle;
      break;
    }
  }

  APPL_TRACE_DEBUG("bta_ag_rfc_acp_open: conn_service = %d conn_handle = %d",
                   p_scb->conn_service, p_scb->conn_handle);

  /* close any unopened server */
  bta_ag_close_servers(
      p_scb, (p_scb->reg_services & ~bta_ag_svc_mask[p_scb->conn_service]));

  /* do service discovery to get features */
  bta_ag_do_disc(p_scb, bta_ag_svc_mask[p_scb->conn_service]);

  /* continue with common open processing */
  bta_ag_rfc_open(p_scb, p_data);
}

/*******************************************************************************
 *
 * Function         bta_ag_rfc_data
 *
 * Description      Read and process data from RFCOMM.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_rfc_data(tBTA_AG_SCB* p_scb, UNUSED_ATTR tBTA_AG_DATA* p_data) {
  uint16_t len;
  char buf[BTA_AG_RFC_READ_MAX];

  memset(buf, 0, BTA_AG_RFC_READ_MAX);

  APPL_TRACE_DEBUG("%s", __func__);

  /* do the following */
  for (;;) {
    /* read data from rfcomm; if bad status, we're done */
    if (PORT_ReadData(p_scb->conn_handle, buf, BTA_AG_RFC_READ_MAX, &len) !=
        PORT_SUCCESS) {
      break;
    }

    /* if no data, we're done */
    if (len == 0) {
      break;
    }

    /* run AT command interpreter on data */
    bta_sys_busy(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);
    bta_ag_at_parse(&p_scb->at_cb, buf, len);
    if ((p_scb->sco_idx != BTM_INVALID_SCO_INDEX) &&
        bta_ag_sco_is_open(p_scb)) {
      APPL_TRACE_DEBUG("%s change link policy for SCO", __func__);
      bta_sys_sco_open(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);
    } else {
      bta_sys_idle(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);
    }

    /* no more data to read, we're done */
    if (len < BTA_AG_RFC_READ_MAX) {
      break;
    }
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_start_close
 *
 * Description      Start the process of closing SCO and RFCOMM connection.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_start_close(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  /* Take the link out of sniff and set L2C idle time to 0 */
  bta_dm_pm_active(p_scb->peer_addr);
  L2CA_SetIdleTimeoutByBdAddr(p_scb->peer_addr, 0, BT_TRANSPORT_BR_EDR);

  /* if SCO is open close SCO and wait on RFCOMM close */
  if (bta_ag_sco_is_open(p_scb)) {
    p_scb->post_sco = BTA_AG_POST_SCO_CLOSE_RFC;
  } else {
    p_scb->post_sco = BTA_AG_POST_SCO_NONE;
    bta_ag_rfc_do_close(p_scb, p_data);
  }

  /* always do SCO shutdown to handle all SCO corner cases */
  bta_ag_sco_shutdown(p_scb, p_data);
}

/*******************************************************************************
 *
 * Function         bta_ag_post_sco_open
 *
 * Description      Perform post-SCO open action, if any
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_post_sco_open(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  switch (p_scb->post_sco) {
    case BTA_AG_POST_SCO_RING:
      bta_ag_send_ring(p_scb, p_data);
      p_scb->post_sco = BTA_AG_POST_SCO_NONE;
      break;

    case BTA_AG_POST_SCO_CALL_CONN:
      bta_ag_send_call_inds(p_scb, BTA_AG_IN_CALL_CONN_RES);
      p_scb->post_sco = BTA_AG_POST_SCO_NONE;
      break;

    default:
      break;
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_post_sco_close
 *
 * Description      Perform post-SCO close action, if any
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_post_sco_close(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  switch (p_scb->post_sco) {
    case BTA_AG_POST_SCO_CLOSE_RFC:
      bta_ag_rfc_do_close(p_scb, p_data);
      p_scb->post_sco = BTA_AG_POST_SCO_NONE;
      break;

    case BTA_AG_POST_SCO_CALL_CONN:
      bta_ag_send_call_inds(p_scb, BTA_AG_IN_CALL_CONN_RES);
      p_scb->post_sco = BTA_AG_POST_SCO_NONE;
      break;

    case BTA_AG_POST_SCO_CALL_ORIG:
      bta_ag_send_call_inds(p_scb, BTA_AG_OUT_CALL_ORIG_RES);
      p_scb->post_sco = BTA_AG_POST_SCO_NONE;
      break;

    case BTA_AG_POST_SCO_CALL_END:
      bta_ag_send_call_inds(p_scb, BTA_AG_END_CALL_RES);
      p_scb->post_sco = BTA_AG_POST_SCO_NONE;
      break;

    case BTA_AG_POST_SCO_CALL_END_INCALL:
      bta_ag_send_call_inds(p_scb, BTA_AG_END_CALL_RES);

      /* Sending callsetup IND and Ring were defered to after SCO close. */
      bta_ag_send_call_inds(p_scb, BTA_AG_IN_CALL_RES);

      if (bta_ag_inband_enabled(p_scb) &&
          !(p_scb->features & BTA_AG_FEAT_NOSCO)) {
        p_scb->post_sco = BTA_AG_POST_SCO_RING;
        bta_ag_sco_open(p_scb, p_data);
      } else {
        p_scb->post_sco = BTA_AG_POST_SCO_NONE;
        bta_ag_send_ring(p_scb, p_data);
      }
      break;

    default:
      break;
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_svc_conn_open
 *
 * Description      Service level connection opened
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_svc_conn_open(tBTA_AG_SCB* p_scb,
                          UNUSED_ATTR tBTA_AG_DATA* p_data) {
  tBTA_AG_CONN evt;

  if (!p_scb->svc_conn) {
    /* set state variable */
    p_scb->svc_conn = true;

    /* Clear AT+BIA mask from previous SLC if any. */
    p_scb->bia_masked_out = 0;

    alarm_cancel(p_scb->ring_timer);

    /* call callback */
    evt.hdr.handle = bta_ag_scb_to_idx(p_scb);
    evt.hdr.app_id = p_scb->app_id;
    evt.peer_feat = p_scb->peer_features;
    evt.bd_addr = p_scb->peer_addr;
    evt.peer_codec = p_scb->peer_codecs;

    if ((p_scb->call_ind != BTA_AG_CALL_INACTIVE) ||
        (p_scb->callsetup_ind != BTA_AG_CALLSETUP_NONE)) {
      bta_sys_sco_use(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);
    }

    (*bta_ag_cb.p_cback)(BTA_AG_CONN_EVT, (tBTA_AG*)&evt);
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_ci_rx_data
 *
 * Description      Send result code
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_ci_rx_data(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  uint16_t len;
  tBTA_AG_CI_RX_WRITE* p_rx_write_msg = (tBTA_AG_CI_RX_WRITE*)p_data;
  char* p_data_area =
      (char*)(p_rx_write_msg + 1); /* Point to data area after header */

  APPL_TRACE_DEBUG("bta_ag_ci_rx_data:");
  /* send to RFCOMM */
  bta_sys_busy(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);
  PORT_WriteData(p_scb->conn_handle, p_data_area, strlen(p_data_area), &len);
  if ((p_scb->sco_idx != BTM_INVALID_SCO_INDEX) && bta_ag_sco_is_open(p_scb)) {
    APPL_TRACE_DEBUG("bta_ag_rfc_data, change link policy for SCO");
    bta_sys_sco_open(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);
  } else {
    bta_sys_idle(BTA_ID_AG, p_scb->app_id, p_scb->peer_addr);
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_rcvd_slc_ready
 *
 * Description      Handles SLC ready call-in in case of pass-through mode.
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_rcvd_slc_ready(tBTA_AG_SCB* p_scb,
                           UNUSED_ATTR tBTA_AG_DATA* p_data) {
  APPL_TRACE_DEBUG("bta_ag_rcvd_slc_ready: handle = %d",
                   bta_ag_scb_to_idx(p_scb));

  if (bta_ag_cb.parse_mode == BTA_AG_PASS_THROUGH) {
    /* In pass-through mode, BTA knows that SLC is ready only through call-in.
     */
    bta_ag_svc_conn_open(p_scb, NULL);
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_setcodec
 *
 * Description      Handle API SetCodec
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_setcodec(tBTA_AG_SCB* p_scb, tBTA_AG_DATA* p_data) {
  tBTA_AG_PEER_CODEC codec_type = p_data->api_setcodec.codec;
  tBTA_AG_VAL val;

  /* Check if the requested codec type is valid */
  if ((codec_type != BTA_AG_CODEC_NONE) && (codec_type != BTA_AG_CODEC_CVSD) &&
      (codec_type != BTA_AG_CODEC_MSBC)) {
    val.num = codec_type;
    val.hdr.status = BTA_AG_FAIL_RESOURCES;
    APPL_TRACE_ERROR("bta_ag_setcodec error: unsupported codec type %d",
                     codec_type);
    (*bta_ag_cb.p_cback)(BTA_AG_WBS_EVT, (tBTA_AG*)&val);
    return;
  }

  if ((p_scb->peer_codecs & codec_type) || (codec_type == BTA_AG_CODEC_NONE) ||
      (codec_type == BTA_AG_CODEC_CVSD)) {
    p_scb->sco_codec = codec_type;
    p_scb->codec_updated = true;
    val.num = codec_type;
    val.hdr.status = BTA_AG_SUCCESS;
    APPL_TRACE_DEBUG("bta_ag_setcodec: Updated codec type %d", codec_type);
  } else {
    val.num = codec_type;
    val.hdr.status = BTA_AG_FAIL_RESOURCES;
    APPL_TRACE_ERROR("bta_ag_setcodec error: unsupported codec type %d",
                     codec_type);
  }

  (*bta_ag_cb.p_cback)(BTA_AG_WBS_EVT, (tBTA_AG*)&val);
}