esp-idf/components/bt/bluedroid/bta/dm/bta_dm_pm.c

/******************************************************************************
 *
 *  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 the action functions for device manager state
 *  machine.
 *
 ******************************************************************************/

// #include <assert.h>
#include <string.h>

#include "bta/bta_sys.h"
#include "bta/bta_api.h"
#include "bta_dm_int.h"
#include "stack/btm_api.h"
#include "osi/allocator.h"

tBTA_DM_CONNECTED_SRVCS bta_dm_conn_srvcs;

#if (BTA_DM_PM_INCLUDED == TRUE)
static void bta_dm_pm_cback(tBTA_SYS_CONN_STATUS status, UINT8 id, UINT8 app_id, BD_ADDR peer_addr);
static void bta_dm_pm_set_mode(BD_ADDR peer_addr, tBTA_DM_PM_ACTION pm_mode,
                               tBTA_DM_PM_REQ pm_req);
static void bta_dm_pm_timer_cback(void *p_tle);
static void bta_dm_pm_btm_cback(BD_ADDR bd_addr, tBTM_PM_STATUS status, UINT16 value, UINT8 hci_status);
static BOOLEAN bta_dm_pm_park(BD_ADDR peer_addr);
static BOOLEAN bta_dm_pm_sniff(tBTA_DM_PEER_DEVICE *p_peer_dev, UINT8 index);
static BOOLEAN bta_dm_pm_is_sco_active ();
static void bta_dm_pm_hid_check(BOOLEAN bScoActive);
static void bta_dm_pm_set_sniff_policy(tBTA_DM_PEER_DEVICE *p_dev, BOOLEAN bDisable);
static void bta_dm_pm_stop_timer_by_index(tBTA_PM_TIMER *p_timer,
        UINT8 timer_idx);

#if (BTM_SSR_INCLUDED == TRUE)
#if (defined BTA_HH_INCLUDED && BTA_HH_INCLUDED == TRUE)
#include "../hh/bta_hh_int.h"
/* BTA_DM_PM_SSR1 will be dedicated for HH SSR setting entry, no other profile can use it */
#define BTA_DM_PM_SSR_HH      BTA_DM_PM_SSR1
#endif /* (defined BTA_HH_INCLUDED && BTA_HH_INCLUDED == TRUE) */
static void bta_dm_pm_ssr(BD_ADDR peer_addr);
#endif /* (BTM_SSR_INCLUDED == TRUE) */

/*******************************************************************************
**
** Function         bta_dm_init_pm
**
** Description      Initializes the BT low power manager
**
**
** Returns          void
**
*******************************************************************************/
void bta_dm_init_pm(void)
{
    memset(&bta_dm_conn_srvcs, 0x00, sizeof(bta_dm_conn_srvcs));

    /* if there are no power manger entries, so not register */
    if (p_bta_dm_pm_cfg[0].app_id != 0) {
        bta_sys_pm_register((tBTA_SYS_CONN_CBACK *)bta_dm_pm_cback);

        BTM_PmRegister((BTM_PM_REG_SET | BTM_PM_REG_NOTIF), &bta_dm_cb.pm_id,
                       bta_dm_pm_btm_cback);
    }

    /* Need to initialize all PM timer service IDs */
    for (int i = 0; i < BTA_DM_NUM_PM_TIMER; i++) {
        for (int j = 0; j < BTA_DM_PM_MODE_TIMER_MAX; j++) {
            bta_dm_cb.pm_timer[i].srvc_id[j] = BTA_ID_MAX;
        }
    }
}


/*******************************************************************************
**
** Function         bta_dm_disable_pm
**
** Description      Disable PM
**
**
** Returns          void
**
*******************************************************************************/
void bta_dm_disable_pm(void)
{
    BTM_PmRegister( BTM_PM_DEREG, &bta_dm_cb.pm_id, NULL);

    /*
     * Deregister the PM callback from the system handling to prevent
     * re-enabling the PM timers after this call if the callback is invoked.
     */
    bta_sys_pm_register((tBTA_SYS_CONN_CBACK *)NULL);

    /* Need to stop all active timers. */
    for (int i = 0; i < BTA_DM_NUM_PM_TIMER; i++) {
        for (int j = 0; j < BTA_DM_PM_MODE_TIMER_MAX; j++) {
            bta_dm_pm_stop_timer_by_index(&bta_dm_cb.pm_timer[i], j);
            bta_dm_cb.pm_timer[i].pm_action[j] = BTA_DM_PM_NO_ACTION;
        }
    }
}

/*******************************************************************************
**
** Function         bta_dm_pm_stop_timer
**
** Description      stop a PM timer
**
**
** Returns          void
**
*******************************************************************************/
static void bta_dm_pm_stop_timer(BD_ADDR peer_addr)
{
    APPL_TRACE_DEBUG("%s: ", __func__);

    for (int i = 0; i < BTA_DM_NUM_PM_TIMER; i++) {
        if (bta_dm_cb.pm_timer[i].in_use && !bdcmp(bta_dm_cb.pm_timer[i].peer_bdaddr, peer_addr)) {
            for (int j = 0; j < BTA_DM_PM_MODE_TIMER_MAX; j++) {
                bta_dm_pm_stop_timer_by_index(&bta_dm_cb.pm_timer[i], j);
                /*
                 * TODO: For now, stopping the timer does not reset
                 * pm_action[j].
                 * The reason is because some of the internal logic that
                 * (re)assigns the pm_action[] values is taking into account
                 * the older value; e.g., see the pm_action[] assignment in
                 * function bta_dm_pm_start_timer().
                 * Such subtlety in the execution logic is error prone, and
                 * should be eliminiated in the future.
                 */
            }
            break;
        }
    }
}

/*******************************************************************************
**
** Function         bta_pm_action_to_timer_idx
**
** Description      convert power mode into timer index for each connected device
**
**
** Returns          index of the power mode delay timer
**
*******************************************************************************/
static UINT8 bta_pm_action_to_timer_idx(UINT8 pm_action)
{
    if (pm_action == BTA_DM_PM_SUSPEND) {
        return BTA_DM_PM_SUSPEND_TIMER_IDX;
    } else if (pm_action == BTA_DM_PM_PARK) {
        return BTA_DM_PM_PARK_TIMER_IDX;
    } else if ((pm_action & BTA_DM_PM_SNIFF) == BTA_DM_PM_SNIFF) {
        return BTA_DM_PM_SNIFF_TIMER_IDX;
    }

    /* Active, no preference, no action and retry */
    return BTA_DM_PM_MODE_TIMER_MAX;
}

/*******************************************************************************
**
** Function         bta_dm_pm_stop_timer_by_mode
**
** Description      stop a PM timer
**
**
** Returns          void
**
*******************************************************************************/
static void bta_dm_pm_stop_timer_by_mode(BD_ADDR peer_addr, UINT8 power_mode)
{
    const UINT8 timer_idx = bta_pm_action_to_timer_idx(power_mode);
    if (timer_idx == BTA_DM_PM_MODE_TIMER_MAX) {
        return;
    }

    for (int i = 0; i < BTA_DM_NUM_PM_TIMER; i++) {
        if (bta_dm_cb.pm_timer[i].in_use && !bdcmp(bta_dm_cb.pm_timer[i].peer_bdaddr, peer_addr)) {
            if (bta_dm_cb.pm_timer[i].srvc_id[timer_idx] != BTA_ID_MAX) {
                bta_dm_pm_stop_timer_by_index(&bta_dm_cb.pm_timer[i], timer_idx);
                /*
                 * TODO: Intentionally setting pm_action[timer_idx].
                 * This assignment should be eliminated in the future - see the
                 * pm_action[] related comment inside function
                 * bta_dm_pm_stop_timer().
                 */
                bta_dm_cb.pm_timer[i].pm_action[timer_idx] = power_mode;
            }
            break;
        }
    }
}

/*******************************************************************************
**
** Function         bta_dm_pm_stop_timer_by_srvc_id
**
** Description      stop all timer started by the service ID.
**
**
** Returns          index of the power mode delay timer
**
*******************************************************************************/
static void bta_dm_pm_stop_timer_by_srvc_id(BD_ADDR peer_addr, UINT8 srvc_id)
{
    for (int i = 0; i < BTA_DM_NUM_PM_TIMER; i++) {
        if (bta_dm_cb.pm_timer[i].in_use && !bdcmp(bta_dm_cb.pm_timer[i].peer_bdaddr, peer_addr)) {
            for (int j = 0; j < BTA_DM_PM_MODE_TIMER_MAX; j++) {
                if (bta_dm_cb.pm_timer[i].srvc_id[j] == srvc_id) {
                    bta_dm_pm_stop_timer_by_index(&bta_dm_cb.pm_timer[i], j);
                    bta_dm_cb.pm_timer[i].pm_action[j] = BTA_DM_PM_NO_ACTION;
                    break;
                }
            }
        }
    }
}

/*******************************************************************************
**
** Function         bta_dm_pm_start_timer
**
** Description      start a PM timer
**
**
** Returns          void
**
*******************************************************************************/
static void bta_dm_pm_start_timer(tBTA_PM_TIMER *p_timer, UINT8 timer_idx,
                                  INT32 timeout, UINT8 srvc_id, UINT8 pm_action)
{
    p_timer->in_use = TRUE;
    p_timer->timer[timer_idx].p_cback = bta_dm_pm_timer_cback;

    if (p_timer->srvc_id[timer_idx] == BTA_ID_MAX) {
        p_timer->active++;
    }

    if (p_timer->pm_action[timer_idx] < pm_action) {
        p_timer->pm_action[timer_idx] = pm_action;
    }

    p_timer->srvc_id[timer_idx] = srvc_id;

    bta_sys_start_timer(&p_timer->timer[timer_idx], 0, timeout);
}

/*******************************************************************************
**
** Function         bta_dm_pm_stop_timer_by_index
**
** Description      stop a PM timer
**
**
** Returns          void
**
*******************************************************************************/
static void bta_dm_pm_stop_timer_by_index(tBTA_PM_TIMER *p_timer,
        UINT8 timer_idx)
{
    if ((p_timer == NULL) || (timer_idx >= BTA_DM_PM_MODE_TIMER_MAX)) {
        return;
    }

    if (p_timer->srvc_id[timer_idx] == BTA_ID_MAX) {
        return;    /* The timer was not scheduled */
    }

    assert(p_timer->in_use && (p_timer->active > 0));

    bta_sys_stop_timer(&p_timer->timer[timer_idx]);
    p_timer->srvc_id[timer_idx] = BTA_ID_MAX;
    /* NOTE: pm_action[timer_idx] intentionally not reset */

    p_timer->active--;
    if (p_timer->active == 0) {
        p_timer->in_use = FALSE;
    }
}

UINT32 bta_dm_pm_get_remaining_ticks (TIMER_LIST_ENT  *p_target_tle)
{
    return bta_sys_get_remaining_ticks(p_target_tle);
}

/*******************************************************************************
**
** Function         bta_dm_pm_cback
**
** Description      Conn change callback from sys for low power management
**
**
** Returns          void
**
*******************************************************************************/
static void bta_dm_pm_cback(tBTA_SYS_CONN_STATUS status, UINT8 id, UINT8 app_id, BD_ADDR peer_addr)
{

    UINT8 i, j;
    tBTA_DM_PEER_DEVICE *p_dev;

#if (BTM_SSR_INCLUDED == TRUE)
    UINT8 *p = NULL;
    int               index = BTA_DM_PM_SSR0;
#endif

    APPL_TRACE_DEBUG("bta_dm_pm_cback: st(%d), id(%d), app(%d)", status, id, app_id);

    p_dev = bta_dm_find_peer_device(peer_addr);

    /* find if there is an power mode entry for the service */
    for (i = 1; i <= p_bta_dm_pm_cfg[0].app_id; i++) {

        if ((p_bta_dm_pm_cfg[i].id == id)
                && ((p_bta_dm_pm_cfg[i].app_id == BTA_ALL_APP_ID ) || (p_bta_dm_pm_cfg[i].app_id == app_id ))) {
            break;
        }

    }

    /* if no entries are there for the app_id and subsystem in p_bta_dm_pm_spec*/
    if (i > p_bta_dm_pm_cfg[0].app_id) {
        return;
    }

    bta_dm_pm_stop_timer_by_srvc_id(peer_addr, id);
    /*p_dev = bta_dm_find_peer_device(peer_addr);*/

#if (BTM_SSR_INCLUDED == TRUE)
    /* set SSR parameters on SYS CONN OPEN */
    if ((BTA_SYS_CONN_OPEN == status) && p_dev && (p_dev->info & BTA_DM_DI_USE_SSR)) {
        index = p_bta_dm_pm_spec[p_bta_dm_pm_cfg[i].spec_idx].ssr;
    }
#endif

    /* if no action for the event */
    if (p_bta_dm_pm_spec[p_bta_dm_pm_cfg[i].spec_idx].actn_tbl[status][0].power_mode == BTA_DM_PM_NO_ACTION) {
#if (BTM_SSR_INCLUDED == TRUE)
        if (BTA_DM_PM_SSR0 == index) /* and do not need to set SSR, return. */
#endif
            return;
    }

    for (j = 0; j < bta_dm_conn_srvcs.count ; j++) {
        /* check if an entry already present */
        if ((bta_dm_conn_srvcs.conn_srvc[j].id == id)
                && (bta_dm_conn_srvcs.conn_srvc[j].app_id == app_id )
                && !bdcmp(bta_dm_conn_srvcs.conn_srvc[j].peer_bdaddr, peer_addr)) {
            bta_dm_conn_srvcs.conn_srvc[j].new_request = TRUE;
            break;
        }

    }

    /* if subsystem has no more preference on the power mode remove
    the cb */
    if (p_bta_dm_pm_spec[p_bta_dm_pm_cfg[i].spec_idx].actn_tbl[status][0].power_mode == BTA_DM_PM_NO_PREF) {
        if (j != bta_dm_conn_srvcs.count) {
            bta_dm_conn_srvcs.count--;

            for (; j < bta_dm_conn_srvcs.count ; j++) {

                memcpy(&bta_dm_conn_srvcs.conn_srvc[j], &bta_dm_conn_srvcs.conn_srvc[j + 1], sizeof(bta_dm_conn_srvcs.conn_srvc[j]));

            }
        } else {
            APPL_TRACE_WARNING("bta_dm_act no entry for connected service cbs");
            return;
        }
    } else if (j == bta_dm_conn_srvcs.count ) {
        /* check if we have more connected service that cbs */
        if (bta_dm_conn_srvcs.count == BTA_DM_NUM_CONN_SRVS) {
            APPL_TRACE_WARNING("bta_dm_act no more connected service cbs");
            return;
        }

        /* fill in a new cb */
        bta_dm_conn_srvcs.conn_srvc[j].id = id;
        bta_dm_conn_srvcs.conn_srvc[j].app_id = app_id;
        bta_dm_conn_srvcs.conn_srvc[j].new_request = TRUE;
        bdcpy(bta_dm_conn_srvcs.conn_srvc[j].peer_bdaddr, peer_addr);

        APPL_TRACE_WARNING("new conn_srvc id:%d, app_id:%d", id, app_id);

        bta_dm_conn_srvcs.count++;
        bta_dm_conn_srvcs.conn_srvc[j].state = status;
    } else {
        /* no service is added or removed. only updating status. */
        bta_dm_conn_srvcs.conn_srvc[j].state = status;
    }

    /* stop timer */
    bta_dm_pm_stop_timer(peer_addr);

    if (p_dev) {
        p_dev->pm_mode_attempted = 0;
        p_dev->pm_mode_failed = 0;
    }

#if (BTM_SSR_INCLUDED == TRUE)
    if (p_bta_dm_ssr_spec[index].max_lat
#if (defined BTA_HH_INCLUDED && BTA_HH_INCLUDED == TRUE)
            || index == BTA_DM_PM_SSR_HH
#endif
       ) {
        bta_dm_pm_ssr(peer_addr);
    } else {
        if ( ((NULL != (p = BTM_ReadLocalFeatures ())) && HCI_SNIFF_SUB_RATE_SUPPORTED(p)) &&
                ((NULL != (p = BTM_ReadRemoteFeatures (peer_addr))) && HCI_SNIFF_SUB_RATE_SUPPORTED(p)) &&
                (index == BTA_DM_PM_SSR0)) {
            if (status == BTA_SYS_SCO_OPEN) {
                APPL_TRACE_DEBUG("%s: SCO inactive, reset SSR to zero", __func__);
                BTM_SetSsrParams (peer_addr, 0, 0, 0 );
            } else if (status == BTA_SYS_SCO_CLOSE) {
                APPL_TRACE_DEBUG("%s: SCO active, back to old SSR", __func__);
                bta_dm_pm_ssr(peer_addr);
            }
        }
    }
#endif

    bta_dm_pm_set_mode(peer_addr, BTA_DM_PM_NO_ACTION, BTA_DM_PM_NEW_REQ);

    /* perform the HID link workaround if needed
    ** 1. If SCO up/down event is received OR
    ** 2. If HID connection open is received and SCO is already active.
    **     This will handle the case where HID connects when SCO already active
    */
    if ( BTM_IsDeviceUp() &&
            ( ((status == BTA_SYS_SCO_OPEN) || (status == BTA_SYS_SCO_CLOSE)) ||
              ((status == BTA_SYS_CONN_OPEN) && (id == BTA_ID_HH) && bta_dm_pm_is_sco_active()) ) ) {
        BOOLEAN bScoActive;
        if (status == BTA_SYS_CONN_OPEN) {
            bScoActive = TRUE;
        } else {
            bScoActive = (status == BTA_SYS_SCO_OPEN);
        }

        bta_dm_pm_hid_check(bScoActive);
    }

}


/*******************************************************************************
**
** Function         bta_dm_pm_set_mode
**
** Description      Set the power mode for the device
**
**
** Returns          void
**
*******************************************************************************/
static void bta_dm_pm_set_mode(BD_ADDR peer_addr, tBTA_DM_PM_ACTION pm_request,
                               tBTA_DM_PM_REQ pm_req )
{

    tBTA_DM_PM_ACTION   pm_action = BTA_DM_PM_NO_ACTION;
    UINT16              timeout = 0;
    UINT8               i, j;
    tBTA_DM_PM_ACTION   failed_pm = 0;
    tBTA_DM_PEER_DEVICE *p_peer_device = NULL;
    tBTA_DM_PM_ACTION    allowed_modes = 0;
    tBTA_DM_PM_ACTION    pref_modes = 0;
    tBTA_DM_PM_CFG      *p_pm_cfg;
    tBTA_DM_PM_SPEC     *p_pm_spec;
    tBTA_DM_PM_ACTN     *p_act0, *p_act1;
    tBTA_DM_SRVCS       *p_srvcs = NULL;
    BOOLEAN timer_started = FALSE;
    UINT8   timer_idx, available_timer = BTA_DM_PM_MODE_TIMER_MAX;
    UINT32  remaining_ticks = 0;

    if (!bta_dm_cb.device_list.count) {
        return;
    }

    /* see if any attempt to put device in low power mode failed */
    p_peer_device = bta_dm_find_peer_device(peer_addr);
    /* if no peer device found return */
    if (p_peer_device == NULL) {
        return;
    }

    failed_pm = p_peer_device->pm_mode_failed;

    for (i = 0; i < bta_dm_conn_srvcs.count ; i++) {

        p_srvcs = &bta_dm_conn_srvcs.conn_srvc[i];
        if (!bdcmp(p_srvcs->peer_bdaddr, peer_addr)) {

            /* p_bta_dm_pm_cfg[0].app_id is the number of entries */
            for (j = 1; j <= p_bta_dm_pm_cfg[0].app_id; j++) {
                if ((p_bta_dm_pm_cfg[j].id == p_srvcs->id)
                        && ((p_bta_dm_pm_cfg[j].app_id == BTA_ALL_APP_ID ) ||
                            (p_bta_dm_pm_cfg[j].app_id == p_srvcs->app_id))) {
                    break;
                }
            }

            p_pm_cfg = &p_bta_dm_pm_cfg[j];
            p_pm_spec = &p_bta_dm_pm_spec[p_pm_cfg->spec_idx];
            p_act0 = &p_pm_spec->actn_tbl[p_srvcs->state][0];
            p_act1 = &p_pm_spec->actn_tbl[p_srvcs->state][1];

            APPL_TRACE_DEBUG("bta_dm_pm_set_mode: srvcsid: %d, state: %d, j: %d", p_srvcs->id, p_srvcs->state, j);
            allowed_modes |= p_pm_spec->allow_mask;

            /* PM actions are in the order of strictness */

            /* first check if the first preference is ok */
            if (!(failed_pm & p_act0->power_mode)) {
                pref_modes |= p_act0->power_mode;

                if (p_act0->power_mode >= pm_action) {
                    pm_action = p_act0->power_mode;

                    if (pm_req != BTA_DM_PM_NEW_REQ || p_srvcs->new_request) {
                        p_srvcs->new_request = FALSE;
                        timeout =  p_act0->timeout;
                    }
                }
            }
            /* if first preference has already failed, try second preference */
            else if (!(failed_pm & p_act1->power_mode)) {
                pref_modes |= p_act1->power_mode;

                if (p_act1->power_mode > pm_action) {
                    pm_action = p_act1->power_mode;
                    timeout =  p_act1->timeout;
                }
            }
        }
    }

    if (pm_action & (BTA_DM_PM_PARK | BTA_DM_PM_SNIFF)) {
        /* some service don't like the mode */
        if (!(allowed_modes & pm_action)) {

            /* select the other mode if its allowed and preferred, otherwise 0 which is BTA_DM_PM_NO_ACTION */
            pm_action =  (allowed_modes & (BTA_DM_PM_PARK | BTA_DM_PM_SNIFF) & pref_modes);

            /* no timeout needed if no action is required */
            if (pm_action == BTA_DM_PM_NO_ACTION) {
                timeout = 0;
            }

        }
    }
    /* if need to start a timer */
    if ((pm_req != BTA_DM_PM_EXECUTE) && timeout) {
        for (i = 0; i < BTA_DM_NUM_PM_TIMER; i++) {
            if (bta_dm_cb.pm_timer[i].in_use && bdcmp(bta_dm_cb.pm_timer[i].peer_bdaddr, peer_addr) == 0) {
                if ((timer_idx = bta_pm_action_to_timer_idx(pm_action)) != BTA_DM_PM_MODE_TIMER_MAX) {
                    remaining_ticks = bta_dm_pm_get_remaining_ticks(&bta_dm_cb.pm_timer[i].timer[timer_idx]);
                    if (remaining_ticks < timeout) {
                        APPL_TRACE_DEBUG("%s remain 0\n", __func__);
                        /* Cancel and restart the timer */
                        /*
                         * TODO: The value of pm_action[timer_idx] is
                         * conditionally updated between the two function
                         * calls below when the timer is restarted.
                         * This logic is error-prone and should be eliminated
                         * in the future.
                         */
                        bta_dm_pm_stop_timer_by_index(&bta_dm_cb.pm_timer[i],
                                                      timer_idx);
                        bta_dm_pm_start_timer(&bta_dm_cb.pm_timer[i], timer_idx, timeout, p_srvcs->id, pm_action);
                    }
                    timer_started = TRUE;
                }
                break;
            } else if (!bta_dm_cb.pm_timer[i].in_use) {
                APPL_TRACE_DEBUG("%s dm_pm_timer:%d, %d", __func__, i, timeout);
                if (available_timer == BTA_DM_PM_MODE_TIMER_MAX) {
                    available_timer = i;
                }
            }
        }
        /* new power mode for a new active connection */
        if (!timer_started) {
            if ( available_timer != BTA_DM_PM_MODE_TIMER_MAX) {
                bdcpy(bta_dm_cb.pm_timer[available_timer].peer_bdaddr, peer_addr);
                if ((timer_idx = bta_pm_action_to_timer_idx(pm_action)) != BTA_DM_PM_MODE_TIMER_MAX) {
                    bta_dm_pm_start_timer(&bta_dm_cb.pm_timer[available_timer], timer_idx, timeout, p_srvcs->id, pm_action);
                    timer_started = TRUE;
                }
            }
            /* no more timers */
            else {
                APPL_TRACE_WARNING("bta_dm_act dm_pm_timer no more");
            }
        }
        return;
    }
    /* if pending power mode timer expires, and currecnt link is in a
       lower power mode than current profile requirement, igonre it */
    if (pm_req == BTA_DM_PM_EXECUTE && pm_request < pm_action) {
        APPL_TRACE_ERROR("Ignore the power mode request: %d", pm_request)
        return;
    }
    if (pm_action == BTA_DM_PM_PARK) {
        p_peer_device->pm_mode_attempted = BTA_DM_PM_PARK;
        bta_dm_pm_park(peer_addr);
    } else if (pm_action & BTA_DM_PM_SNIFF) {
        /* dont initiate SNIFF, if link_policy has it disabled */
        if (p_peer_device->link_policy & HCI_ENABLE_SNIFF_MODE) {
            p_peer_device->pm_mode_attempted = BTA_DM_PM_SNIFF;
            bta_dm_pm_sniff(p_peer_device, (UINT8)(pm_action & 0x0F) );
        } else {
            APPL_TRACE_DEBUG("bta_dm_pm_set_mode: Link policy disallows SNIFF, ignore request");
        }
    } else if (pm_action == BTA_DM_PM_ACTIVE) {
        bta_dm_pm_active(peer_addr);
    }
}
/*******************************************************************************
**
** Function         bta_ag_pm_park
**
** Description      Switch to park mode.
**
**
** Returns          TRUE if park attempted, FALSE otherwise.
**
*******************************************************************************/
static BOOLEAN bta_dm_pm_park(BD_ADDR peer_addr)
{

    tBTM_PM_MODE    mode = BTM_PM_STS_ACTIVE;

    /* if not in park mode, switch to park */
    BTM_ReadPowerMode(peer_addr, &mode);

    if (mode != BTM_PM_MD_PARK) {
        BTM_SetPowerMode (bta_dm_cb.pm_id, peer_addr, &p_bta_dm_pm_md[BTA_DM_PM_PARK_IDX]);
    }
    return TRUE;

}

/*******************************************************************************
**
** Function         bta_ag_pm_sniff
**
** Description      Switch to sniff mode.
**
**
** Returns          TRUE if sniff attempted, FALSE otherwise.
**
*******************************************************************************/
static BOOLEAN bta_dm_pm_sniff(tBTA_DM_PEER_DEVICE *p_peer_dev, UINT8 index)
{
    tBTM_PM_MODE    mode = BTM_PM_STS_ACTIVE;
    tBTM_PM_PWR_MD  pwr_md;
    tBTM_STATUS     status;
#if (BTM_SSR_INCLUDED == TRUE)
    UINT8 *p_rem_feat = NULL;
#endif

    BTM_ReadPowerMode(p_peer_dev->peer_bdaddr, &mode);
#if (BTM_SSR_INCLUDED == TRUE)
    p_rem_feat = BTM_ReadRemoteFeatures (p_peer_dev->peer_bdaddr);
    APPL_TRACE_DEBUG("bta_dm_pm_sniff cur:%d, idx:%d, info:x%x", mode, index, p_peer_dev->info);
    if (mode != BTM_PM_MD_SNIFF ||
            (HCI_SNIFF_SUB_RATE_SUPPORTED(BTM_ReadLocalFeatures ()) && p_rem_feat &&
             HCI_SNIFF_SUB_RATE_SUPPORTED(p_rem_feat) &&
             !(p_peer_dev->info & BTA_DM_DI_USE_SSR)))
#else
    APPL_TRACE_DEBUG("bta_dm_pm_sniff cur:%d, idx:%d", mode, index);
    if (mode != BTM_PM_MD_SNIFF)
#endif
    {
#if (BTM_SSR_INCLUDED == TRUE)
        /* Dont initiate Sniff if controller has alreay accepted
         * remote sniff params. This avoid sniff loop issue with
         * some agrresive headsets who use sniff latencies more than
         * DUT supported range of Sniff intervals.*/
        if ((mode == BTM_PM_MD_SNIFF) && (p_peer_dev->info & BTA_DM_DI_ACP_SNIFF)) {
            APPL_TRACE_DEBUG("%s: already in remote initiate sniff", __func__);
            return TRUE;
        }
#endif
        /* if the current mode is not sniff, issue the sniff command.
         * If sniff, but SSR is not used in this link, still issue the command */
        memcpy(&pwr_md, &p_bta_dm_pm_md[index], sizeof (tBTM_PM_PWR_MD));
        if (p_peer_dev->info & BTA_DM_DI_INT_SNIFF) {
            pwr_md.mode |= BTM_PM_MD_FORCE;
        }
        status = BTM_SetPowerMode (bta_dm_cb.pm_id, p_peer_dev->peer_bdaddr, &pwr_md);
        if (status == BTM_CMD_STORED || status == BTM_CMD_STARTED) {
            p_peer_dev->info &= ~(BTA_DM_DI_INT_SNIFF | BTA_DM_DI_ACP_SNIFF);
            p_peer_dev->info |= BTA_DM_DI_SET_SNIFF;
        } else if (status == BTM_SUCCESS) {
            APPL_TRACE_DEBUG("bta_dm_pm_sniff BTM_SetPowerMode() returns BTM_SUCCESS");
            p_peer_dev->info &= ~(BTA_DM_DI_INT_SNIFF | BTA_DM_DI_ACP_SNIFF | BTA_DM_DI_SET_SNIFF);
        } else { /* error */
            APPL_TRACE_ERROR("bta_dm_pm_sniff BTM_SetPowerMode() returns ERROR status=%d", status);
            p_peer_dev->info &= ~(BTA_DM_DI_INT_SNIFF | BTA_DM_DI_ACP_SNIFF | BTA_DM_DI_SET_SNIFF);
        }
    }
    return TRUE;

}
/*******************************************************************************
**
** Function         bta_dm_pm_ssr
**
** Description      checks and sends SSR parameters
**
** Returns          void
**
*******************************************************************************/
#if (BTM_SSR_INCLUDED == TRUE)
static void bta_dm_pm_ssr(BD_ADDR peer_addr)
{
    tBTA_DM_SSR_SPEC *p_spec, *p_spec_cur;
    UINT8   i, j;
    int     ssr = BTA_DM_PM_SSR0;

    /* go through the connected services */
    for (i = 0; i < bta_dm_conn_srvcs.count ; i++) {
        if (!bdcmp(bta_dm_conn_srvcs.conn_srvc[i].peer_bdaddr, peer_addr)) {
            /* p_bta_dm_pm_cfg[0].app_id is the number of entries */
            for (j = 1; j <= p_bta_dm_pm_cfg[0].app_id; j++) {
                /* find the associated p_bta_dm_pm_cfg */
                if ((p_bta_dm_pm_cfg[j].id == bta_dm_conn_srvcs.conn_srvc[i].id)
                        && ((p_bta_dm_pm_cfg[j].app_id == BTA_ALL_APP_ID )
                            || (p_bta_dm_pm_cfg[j].app_id == bta_dm_conn_srvcs.conn_srvc[i].app_id))) {
                    APPL_TRACE_WARNING("bta_dm_pm_ssr conn_srvc id:%d, app_id:%d",
                                       bta_dm_conn_srvcs.conn_srvc[i].id, bta_dm_conn_srvcs.conn_srvc[i].app_id);
                    break;
                }
            }

            /* find the ssr index with the smallest max latency. */
            p_spec_cur = &p_bta_dm_ssr_spec[p_bta_dm_pm_spec[p_bta_dm_pm_cfg[j].spec_idx].ssr];
            p_spec = &p_bta_dm_ssr_spec[ssr];

#if (defined BTA_HH_INCLUDED && BTA_HH_INCLUDED == TRUE)
            /* HH has the per connection SSR preference, already read the SSR params from BTA HH */
            if (p_bta_dm_pm_spec[p_bta_dm_pm_cfg[j].spec_idx].ssr == BTA_DM_PM_SSR_HH) {
                if (bta_hh_read_ssr_param(peer_addr, &p_spec_cur->max_lat, &p_spec_cur->min_rmt_to) == BTA_HH_ERR) {
                    continue;
                }
            }
#endif
            if (p_spec_cur->max_lat < p_spec->max_lat ||
                    (ssr == BTA_DM_PM_SSR0 && p_bta_dm_pm_spec[p_bta_dm_pm_cfg[j].spec_idx].ssr != BTA_DM_PM_SSR0)) {
                ssr = p_bta_dm_pm_spec[p_bta_dm_pm_cfg[j].spec_idx].ssr;
            }

        }
    }

    p_spec = &p_bta_dm_ssr_spec[ssr];
    APPL_TRACE_WARNING("bta_dm_pm_ssr:%d, lat:%d", ssr, p_spec->max_lat);
    if (p_spec->max_lat) {
        /* set the SSR parameters. */
        BTM_SetSsrParams (peer_addr, p_spec->max_lat,
                          p_spec->min_rmt_to, p_spec->min_loc_to);
    }
}
#endif

/*******************************************************************************
**
** Function         bta_dm_pm_active
**
** Description      Brings connection to active mode
**
**
** Returns          void
**
*******************************************************************************/
void bta_dm_pm_active(BD_ADDR peer_addr)
{
    tBTM_PM_PWR_MD  pm;

    memset( (void *)&pm, 0, sizeof(pm));

    /* switch to active mode */
    pm.mode = BTM_PM_MD_ACTIVE;
    BTM_SetPowerMode (bta_dm_cb.pm_id, peer_addr, &pm);
}

/*******************************************************************************
**
** Function         bta_dm_pm_btm_cback
**
** Description      BTM power manager callback.
**
**
** Returns          void
**
*******************************************************************************/
static void bta_dm_pm_btm_cback(BD_ADDR bd_addr, tBTM_PM_STATUS status, UINT16 value, UINT8 hci_status)
{
    tBTA_DM_PM_BTM_STATUS  *p_buf;

    if ((p_buf = (tBTA_DM_PM_BTM_STATUS *) osi_malloc(sizeof(tBTA_DM_PM_BTM_STATUS))) != NULL) {
        p_buf->hdr.event = BTA_DM_PM_BTM_STATUS_EVT;
        p_buf->status = status;
        p_buf->value = value;
        p_buf->hci_status = hci_status;
        bdcpy(p_buf->bd_addr, bd_addr);
        bta_sys_sendmsg(p_buf);
    }
}

/*******************************************************************************
**
** Function         bta_dm_pm_timer_cback
**
** Description      Power management timer callback.
**
**
** Returns          void
**
*******************************************************************************/
static void bta_dm_pm_timer_cback(void *p_tle)
{
    UINT8 i, j;

    for (i = 0; i < BTA_DM_NUM_PM_TIMER; i++) {
        APPL_TRACE_DEBUG("dm_pm_timer[%d] in use? %d", i, bta_dm_cb.pm_timer[i].in_use);
        if (bta_dm_cb.pm_timer[i].in_use) {
            for (j = 0; j < BTA_DM_PM_MODE_TIMER_MAX; j++) {
                if (&bta_dm_cb.pm_timer[i].timer[j] == (TIMER_LIST_ENT *) p_tle) {
                    bta_dm_cb.pm_timer[i].active --;
                    bta_dm_cb.pm_timer[i].srvc_id[j] = BTA_ID_MAX;
                    APPL_TRACE_DEBUG("dm_pm_timer[%d] expires, timer_idx=%d", i, j);
                    break;
                }
            }
            if (bta_dm_cb.pm_timer[i].active == 0) {
                bta_dm_cb.pm_timer[i].in_use = FALSE;
            }
            if (j < BTA_DM_PM_MODE_TIMER_MAX) {
                break;
            }
        }
    }

    /* no more timers */
    if (i == BTA_DM_NUM_PM_TIMER) {
        return;
    }

    tBTA_DM_PM_TIMER *p_buf = (tBTA_DM_PM_TIMER *) osi_malloc(sizeof(tBTA_DM_PM_TIMER));
    if (p_buf != NULL) {
        p_buf->hdr.event = BTA_DM_PM_TIMER_EVT;
        p_buf->pm_request = bta_dm_cb.pm_timer[i].pm_action[j];
        bdcpy(p_buf->bd_addr, bta_dm_cb.pm_timer[i].peer_bdaddr);
        bta_sys_sendmsg(p_buf);
    }
}


/*******************************************************************************
**
** Function         bta_dm_pm_btm_status
**
** Description      Process pm status event from btm
**
**
** Returns          void
**
*******************************************************************************/
void bta_dm_pm_btm_status(tBTA_DM_MSG *p_data)
{
    APPL_TRACE_DEBUG("%s status: %d", __func__, p_data->pm_status.status);

    tBTA_DM_PEER_DEVICE *p_dev = bta_dm_find_peer_device(p_data->pm_status.bd_addr);
    if (NULL == p_dev) {
        return;
    }

    tBTA_DM_DEV_INFO info = p_dev->info;
    /* check new mode */
    switch (p_data->pm_status.status) {
    case BTM_PM_STS_ACTIVE:
        /* if our sniff or park attempt failed
        we should not try it again*/
        if (p_data->pm_status.hci_status != 0) {
            APPL_TRACE_ERROR("%s hci_status=%d", __func__, p_data->pm_status.hci_status);
            p_dev->info &= ~(BTA_DM_DI_INT_SNIFF | BTA_DM_DI_ACP_SNIFF | BTA_DM_DI_SET_SNIFF);

            if (p_dev->pm_mode_attempted & (BTA_DM_PM_PARK | BTA_DM_PM_SNIFF)) {
                p_dev->pm_mode_failed
                |= ((BTA_DM_PM_PARK | BTA_DM_PM_SNIFF) & p_dev->pm_mode_attempted);
                bta_dm_pm_stop_timer_by_mode(p_data->pm_status.bd_addr, p_dev->pm_mode_attempted);
                bta_dm_pm_set_mode(p_data->pm_status.bd_addr, BTA_DM_PM_NO_ACTION, BTA_DM_PM_RESTART);
            }
        } else {
#if (BTM_SSR_INCLUDED == TRUE)
            if (p_dev->prev_low) {
                /* need to send the SSR paramaters to controller again */
                bta_dm_pm_ssr(p_dev->peer_bdaddr);
            }
            p_dev->prev_low = BTM_PM_STS_ACTIVE;
#endif
            /* link to active mode, need to restart the timer for next low power mode if needed */
            bta_dm_pm_stop_timer(p_data->pm_status.bd_addr);
            bta_dm_pm_set_mode(p_data->pm_status.bd_addr, BTA_DM_PM_NO_ACTION, BTA_DM_PM_RESTART);
        }
        break;

#if (BTM_SSR_INCLUDED == TRUE)
    case BTM_PM_STS_PARK:
    case BTM_PM_STS_HOLD:
        /* save the previous low power mode - for SSR.
         * SSR parameters are sent to controller on "conn open".
         * the numbers stay good until park/hold/detach */
        if (p_dev->info & BTA_DM_DI_USE_SSR) {
            p_dev->prev_low = p_data->pm_status.status;
        }
        break;

    case BTM_PM_STS_SSR:
        if (p_data->pm_status.value) {
            p_dev->info |= BTA_DM_DI_USE_SSR;
        } else {
            p_dev->info &= ~BTA_DM_DI_USE_SSR;
        }
        break;
#endif
    case BTM_PM_STS_SNIFF:
        if (p_data->pm_status.hci_status == 0) {
            /* Stop PM timer now if already active for
             * particular device since link is already
             * put in sniff mode by remote device, and
             * PM timer sole purpose is to put the link
             * in sniff mode from host side.
             */
            bta_dm_pm_stop_timer(p_data->pm_status.bd_addr);
        } else {
            p_dev->info &= ~(BTA_DM_DI_SET_SNIFF | BTA_DM_DI_INT_SNIFF | BTA_DM_DI_ACP_SNIFF);
            if (info & BTA_DM_DI_SET_SNIFF) {
                p_dev->info |= BTA_DM_DI_INT_SNIFF;
            } else {
                p_dev->info |= BTA_DM_DI_ACP_SNIFF;
            }
        }
        break;

    case BTM_PM_STS_ERROR:
        p_dev->info &= ~BTA_DM_DI_SET_SNIFF;
        break;

    default:
        break;
    }
}


/*******************************************************************************
**
** Function         bta_dm_pm_timer
**
** Description      Process pm timer event from btm
**
**
** Returns          void
**
*******************************************************************************/
void bta_dm_pm_timer(tBTA_DM_MSG *p_data)
{
    APPL_TRACE_EVENT("%s", __func__);
    bta_dm_pm_set_mode(p_data->pm_timer.bd_addr, p_data->pm_timer.pm_request, BTA_DM_PM_EXECUTE);
}

/*******************************************************************************
**
** Function         bta_dm_is_sco_active
**
** Description      Loop through connected services for HFP+State=SCO
**
** Returns          BOOLEAN. TRUE if SCO active, else FALSE
**
*******************************************************************************/
static BOOLEAN bta_dm_pm_is_sco_active ()
{
    int j;
    BOOLEAN bScoActive = FALSE;

    for (j = 0; j < bta_dm_conn_srvcs.count ; j++) {
        /* check if an entry already present */
        if ( (bta_dm_conn_srvcs.conn_srvc[j].id == BTA_ID_AG )  && (bta_dm_conn_srvcs.conn_srvc[j].state == BTA_SYS_SCO_OPEN) ) {
            bScoActive = TRUE;
            break;
        }
    }

    APPL_TRACE_DEBUG("bta_dm_is_sco_active: SCO active: %d", bScoActive);
    return bScoActive;
}


/*******************************************************************************
**
** Function         bta_dm_pm_hid_check
**
** Description      Disables/Enables sniff in link policy based on SCO Up/Down
**
** Returns          None
**
*******************************************************************************/

static void bta_dm_pm_hid_check(BOOLEAN bScoActive)
{
    int j;

    /* if HID is active, disable the link policy */
    for (j = 0; j < bta_dm_conn_srvcs.count ; j++) {
        /* check if an entry already present */
        if (bta_dm_conn_srvcs.conn_srvc[j].id == BTA_ID_HH ) {
            APPL_TRACE_DEBUG ("SCO status change(Active: %d), modify HID link policy. state: %d",
                              bScoActive, bta_dm_conn_srvcs.conn_srvc[j].state);
            bta_dm_pm_set_sniff_policy( bta_dm_find_peer_device(bta_dm_conn_srvcs.conn_srvc[j].peer_bdaddr), bScoActive);

            /* if we had disabled link policy, seems like the hid device stop retrying SNIFF after a few tries. force sniff if needed */
            if (!bScoActive) {
                bta_dm_pm_set_mode(bta_dm_conn_srvcs.conn_srvc[j].peer_bdaddr, BTA_DM_PM_NO_ACTION,
                                   BTA_DM_PM_RESTART);
            }
        }
    }

}

/*******************************************************************************
**
** Function         bta_dm_pm_set_sniff_policy
**
** Description      Disables/Enables sniff in link policy for the give device
**
** Returns          None
**
*******************************************************************************/
static void bta_dm_pm_set_sniff_policy(tBTA_DM_PEER_DEVICE *p_dev, BOOLEAN bDisable)
{
    UINT16 policy_setting;

    if (!p_dev) {
        return;
    }

    if (bDisable) {
        policy_setting = bta_dm_cb.cur_policy &
                         (HCI_ENABLE_MASTER_SLAVE_SWITCH |
                          HCI_ENABLE_HOLD_MODE  |
                          HCI_ENABLE_PARK_MODE);

    } else {
        /*  allow sniff after sco is closed */
        policy_setting = bta_dm_cb.cur_policy;
    }

    /* if disabling SNIFF, make sure link is Active */
    if (bDisable) {
        bta_dm_pm_active(p_dev->peer_bdaddr);
    }

    /* update device record and set link policy */
    p_dev->link_policy = policy_setting;
    BTM_SetLinkPolicy(p_dev->peer_bdaddr, &policy_setting);

}
#endif /* #if (BTA_DM_PM_INCLUDED == TRUE) */

/*******************************************************************************
**
** Function         bta_dm_get_av_count
**
** Description      Get the number of connected AV
**
**
** Returns          number of av connections
**
*******************************************************************************/
UINT8 bta_dm_get_av_count(void)
{
    UINT8 count = 0;
    for (int i = 0; i < bta_dm_conn_srvcs.count; i++) {
        if (bta_dm_conn_srvcs.conn_srvc[i].id == BTA_ID_AV) {
            ++count;
        }
    }
    return count;
}

/*******************************************************************************
**
** Function         bta_dm_find_peer_device
**
** Description      Given an address, find the associated control block.
**
** Returns          tBTA_DM_PEER_DEVICE
**
*******************************************************************************/
tBTA_DM_PEER_DEVICE *bta_dm_find_peer_device(BD_ADDR peer_addr)
{
    tBTA_DM_PEER_DEVICE *p_dev = NULL;

    for (int i = 0; i < bta_dm_cb.device_list.count; i++) {
        if (!bdcmp( bta_dm_cb.device_list.peer_device[i].peer_bdaddr, peer_addr)) {
            p_dev = &bta_dm_cb.device_list.peer_device[i];
            break;
        }

    }
    return p_dev;
}


#if ((defined BLE_INCLUDED) && (BLE_INCLUDED == TRUE) && SDP_INCLUDED == TRUE)
/*******************************************************************************
**
** Function         bta_dm_pm_obtain_controller_state
**
** Description      This function obtains the consolidated controller power state
**
** Parameters:
**
*******************************************************************************/
tBTA_DM_CONTRL_STATE bta_dm_pm_obtain_controller_state(void)
{
    /*   Did not use counts as it is not sure, how accurate the count values are in
     **  bta_dm_cb.device_list.count > 0 || bta_dm_cb.device_list.le_count > 0 */

    tBTA_DM_CONTRL_STATE cur_state = BTA_DM_CONTRL_UNKNOWN;
    cur_state = BTM_PM_ReadControllerState();

    APPL_TRACE_DEBUG("bta_dm_pm_obtain_controller_state: %d", cur_state);
    return cur_state;
}

#endif