xref: /aosp_15_r20/system/nfc/src/gki/common/gki_time.cc (revision 7eba2f3b06c51ae21384f6a4f14577b668a869b3)

/******************************************************************************
 *
 *  Copyright (C) 1999-2012 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.
 *
 ******************************************************************************/
#include <android-base/logging.h>
#include <android-base/stringprintf.h>

#include "gki_int.h"

/* Make sure that this has been defined in target.h */
#ifndef GKI_NUM_TIMERS
#error NO TIMERS: Must define at least 1 timer in the system!
#endif

/* Largest signed positive timer count */
#define GKI_NO_NEW_TMRS_STARTED (0x7fffffffL)
/* Marks an unused timer list entry (initial value) */
#define GKI_UNUSED_LIST_ENTRY (0x80000000L)
#define GKI_MAX_INT32 (0x7fffffffL)

using android::base::StringPrintf;

/*******************************************************************************
**
** Function         gki_timers_init
**
** Description      This internal function is called once at startup to
**                  initialize all the timer structures.
**
** Returns          void
**
*******************************************************************************/
void gki_timers_init(void) {
  uint8_t tt;

  gki_cb.com.OSTicksTilExp =
      0; /* Remaining time (of OSTimeCurTimeout) before next timer expires */
  gki_cb.com.OSNumOrigTicks = 0;
#if (GKI_DELAY_STOP_SYS_TICK > 0)
  gki_cb.com.OSTicksTilStop = 0; /* clear inactivity delay timer */
#endif

  for (tt = 0; tt < GKI_MAX_TASKS; tt++) {
    gki_cb.com.OSWaitTmr[tt] = 0;

#if (GKI_NUM_TIMERS > 0)
    gki_cb.com.OSTaskTmr0[tt] = 0;
    gki_cb.com.OSTaskTmr0R[tt] = 0;
#endif

#if (GKI_NUM_TIMERS > 1)
    gki_cb.com.OSTaskTmr1[tt] = 0;
    gki_cb.com.OSTaskTmr1R[tt] = 0;
#endif

#if (GKI_NUM_TIMERS > 2)
    gki_cb.com.OSTaskTmr2[tt] = 0;
    gki_cb.com.OSTaskTmr2R[tt] = 0;
#endif

#if (GKI_NUM_TIMERS > 3)
    gki_cb.com.OSTaskTmr3[tt] = 0;
    gki_cb.com.OSTaskTmr3R[tt] = 0;
#endif
  }

  for (tt = 0; tt < GKI_MAX_TIMER_QUEUES; tt++) {
    gki_cb.com.timer_queues[tt] = nullptr;
  }

  gki_cb.com.p_tick_cb = nullptr;
  gki_cb.com.system_tick_running = false;

  return;
}

/*******************************************************************************
**
** Function         gki_timers_is_timer_running
**
** Description      This internal function is called to test if any gki timer
**                  are running
**
**
** Returns          TRUE if at least one time is running in the system, FALSE
**                  else.
**
*******************************************************************************/
bool gki_timers_is_timer_running(void) {
  uint8_t tt;
  for (tt = 0; tt < GKI_MAX_TASKS; tt++) {
#if (GKI_NUM_TIMERS > 0)
    if (gki_cb.com.OSTaskTmr0[tt]) {
      return true;
    }
#endif

#if (GKI_NUM_TIMERS > 1)
    if (gki_cb.com.OSTaskTmr1[tt]) {
      return true;
    }
#endif

#if (GKI_NUM_TIMERS > 2)
    if (gki_cb.com.OSTaskTmr2[tt]) {
      return true;
    }
#endif

#if (GKI_NUM_TIMERS > 3)
    if (gki_cb.com.OSTaskTmr3[tt]) {
      return true;
    }
#endif
  }

  return false;
}

/*******************************************************************************
**
** Function         GKI_get_tick_count
**
** Description      This function returns the current system ticks
**
** Returns          The current number of system ticks
**
*******************************************************************************/
uint32_t GKI_get_tick_count(void) { return gki_cb.com.OSTicks; }

/*******************************************************************************
**
** Function         GKI_ready_to_sleep
**
** Description      This function returns the number of system ticks until the
**                  next timer will expire.  It is typically called by a power
**                  savings manager to find out how long it can have the system
**                  sleep before it needs to service the next entry.
**
** Parameters:      None
**
** Returns          Number of ticks til the next timer expires
**                  Note: The value is a signed  value.  This value should be
**                      compared to x > 0, to avoid misinterpreting negative
**                      tick values.
**
*******************************************************************************/
int32_t GKI_ready_to_sleep(void) { return (gki_cb.com.OSTicksTilExp); }

/*******************************************************************************
**
** Function         GKI_start_timer
**
** Description      An application can call this function to start one of
**                  it's four general purpose timers. Any of the four timers
**                  can be 1-shot or continuous. If a timer is already running,
**                  it will be reset to the new parameters.
**
** Parameters       tnum            - (input) timer number to be started
**                                            (TIMER_0, TIMER_1, TIMER_2, or
**                                            TIMER_3)
**                  ticks           - (input) the number of system ticks til the
**                                            timer expires.
**                  is_continuous   - (input) TRUE if timer restarts
**                                            automatically, else FALSE if it is
**                                            a 'one-shot'.
**
** Returns          void
**
*******************************************************************************/
void GKI_start_timer(uint8_t tnum, int32_t ticks, bool is_continuous) {
  int32_t reload;
  int32_t orig_ticks;
  uint8_t task_id = GKI_get_taskid();
  bool bad_timer = false;

  if (task_id >= GKI_MAX_TASKS) {
    LOG(ERROR) << StringPrintf("%s: invalid task_id:0x%02x. start timer failed",
                               __func__, task_id);
    return;
  }

  if (ticks <= 0) ticks = 1;

  orig_ticks = ticks; /* save the ticks in case adjustment is necessary */

  /* If continuous timer, set reload, else set it to 0 */
  if (is_continuous)
    reload = ticks;
  else
    reload = 0;

  GKI_disable();

  if (gki_timers_is_timer_running() == false) {
#if (GKI_DELAY_STOP_SYS_TICK > 0)
    /* if inactivity delay timer is not running, start system tick */
    if (gki_cb.com.OSTicksTilStop == 0) {
#endif
      if (gki_cb.com.p_tick_cb) {
        /* start system tick */
        gki_cb.com.system_tick_running = true;
        (gki_cb.com.p_tick_cb)(true);
      }
#if (GKI_DELAY_STOP_SYS_TICK > 0)
    } else {
      /* clear inactivity delay timer */
      gki_cb.com.OSTicksTilStop = 0;
    }
#endif
  }
  /* Add the time since the last task timer update.
  ** Note that this works when no timers are active since
  ** both OSNumOrigTicks and OSTicksTilExp are 0.
  */
  if (GKI_MAX_INT32 - (gki_cb.com.OSNumOrigTicks - gki_cb.com.OSTicksTilExp) >
      ticks) {
    ticks += gki_cb.com.OSNumOrigTicks - gki_cb.com.OSTicksTilExp;
  } else
    ticks = GKI_MAX_INT32;

  switch (tnum) {
#if (GKI_NUM_TIMERS > 0)
    case TIMER_0:
      gki_cb.com.OSTaskTmr0R[task_id] = reload;
      gki_cb.com.OSTaskTmr0[task_id] = ticks;
      break;
#endif

#if (GKI_NUM_TIMERS > 1)
    case TIMER_1:
      gki_cb.com.OSTaskTmr1R[task_id] = reload;
      gki_cb.com.OSTaskTmr1[task_id] = ticks;
      break;
#endif

#if (GKI_NUM_TIMERS > 2)
    case TIMER_2:
      gki_cb.com.OSTaskTmr2R[task_id] = reload;
      gki_cb.com.OSTaskTmr2[task_id] = ticks;
      break;
#endif

#if (GKI_NUM_TIMERS > 3)
    case TIMER_3:
      gki_cb.com.OSTaskTmr3R[task_id] = reload;
      gki_cb.com.OSTaskTmr3[task_id] = ticks;
      break;
#endif
    default:
      bad_timer = true; /* Timer number is bad, so do not use */
  }

  /* Update the expiration timeout if a legitimate timer */
  if (!bad_timer) {
    /* Only update the timeout value if it is less than any other newly started
     * timers */
    gki_adjust_timer_count(orig_ticks);
  }

  GKI_enable();
}

/*******************************************************************************
**
** Function         GKI_stop_timer
**
** Description      An application can call this function to stop one of
**                  it's four general purpose timers. There is no harm in
**                  stopping a timer that is already stopped.
**
** Parameters       tnum - (input) timer number to be started (TIMER_0,
**                                 TIMER_1, TIMER_2, or TIMER_3)
** Returns          void
**
*******************************************************************************/
void GKI_stop_timer(uint8_t tnum) {
  uint8_t task_id = GKI_get_taskid();

  GKI_disable();
  if (task_id < GKI_MAX_TASKS) {
    switch (tnum) {
#if (GKI_NUM_TIMERS > 0)
      case TIMER_0:
        gki_cb.com.OSTaskTmr0R[task_id] = 0;
        gki_cb.com.OSTaskTmr0[task_id] = 0;
        break;
#endif

#if (GKI_NUM_TIMERS > 1)
      case TIMER_1:
        gki_cb.com.OSTaskTmr1R[task_id] = 0;
        gki_cb.com.OSTaskTmr1[task_id] = 0;
        break;
#endif

#if (GKI_NUM_TIMERS > 2)
      case TIMER_2:
        gki_cb.com.OSTaskTmr2R[task_id] = 0;
        gki_cb.com.OSTaskTmr2[task_id] = 0;
        break;
#endif

#if (GKI_NUM_TIMERS > 3)
      case TIMER_3:
        gki_cb.com.OSTaskTmr3R[task_id] = 0;
        gki_cb.com.OSTaskTmr3[task_id] = 0;
        break;
#endif
    }
  }

  if (gki_timers_is_timer_running() == false) {
    if (gki_cb.com.p_tick_cb) {
#if (GKI_DELAY_STOP_SYS_TICK > 0)
      /* if inactivity delay timer is not running */
      if ((gki_cb.com.system_tick_running) &&
          (gki_cb.com.OSTicksTilStop == 0)) {
        /* set inactivity delay timer */
        /* when timer expires, system tick will be stopped */
        gki_cb.com.OSTicksTilStop = GKI_DELAY_STOP_SYS_TICK;
      }
#else
      gki_cb.com.system_tick_running = false;
      (gki_cb.com.p_tick_cb)(false); /* stop system tick */
#endif
    }
  }

  GKI_enable();
}

/*******************************************************************************
**
** Function         GKI_timer_update
**
** Description      This function is called by an OS to drive the GKI's timers.
**                  It is typically called at every system tick to
**                  update the timers for all tasks, and check for timeouts.
**
**                  Note: It has been designed to also allow for variable tick
**                        updates so that systems with strict power savings
**                        requirements can have the update occur at variable
**                        intervals.
**
** Parameters:      ticks_since_last_update - (input) This is the number of
**                  TICKS that have occurred since the last time
**                  GKI_timer_update was called.
**
** Returns          void
**
*******************************************************************************/
void GKI_timer_update(int32_t ticks_since_last_update) {
  uint8_t task_id;
  long next_expiration; /* Holds the next soonest expiration time after this
                           update */

  /* Increment the number of ticks used for time stamps */
  gki_cb.com.OSTicks += ticks_since_last_update;

  /* If any timers are running in any tasks, decrement the remaining time til
   * the timer updates need to take place (next expiration occurs)
   */
  gki_cb.com.OSTicksTilExp -= ticks_since_last_update;

  /* Don't allow timer interrupt nesting */
  if (gki_cb.com.timer_nesting) return;

  gki_cb.com.timer_nesting = 1;

#if (GKI_DELAY_STOP_SYS_TICK > 0)
  /* if inactivity delay timer is set and expired */
  if (gki_cb.com.OSTicksTilStop) {
    if (gki_cb.com.OSTicksTilStop <= (uint32_t)ticks_since_last_update) {
      if (gki_cb.com.p_tick_cb) {
        gki_cb.com.system_tick_running = false;
        (gki_cb.com.p_tick_cb)(false); /* stop system tick */
      }
      gki_cb.com.OSTicksTilStop = 0; /* clear inactivity delay timer */
      gki_cb.com.timer_nesting = 0;
      return;
    } else
      gki_cb.com.OSTicksTilStop -= ticks_since_last_update;
  }
#endif

  /* No need to update the ticks if no timeout has occurred */
  if (gki_cb.com.OSTicksTilExp > 0) {
    gki_cb.com.timer_nesting = 0;
    return;
  }

  GKI_disable();

  next_expiration = GKI_NO_NEW_TMRS_STARTED;

  /* If here then gki_cb.com.OSTicksTilExp <= 0. If negative, then increase
     gki_cb.com.OSNumOrigTicks
     to account for the difference so timer updates below are decremented by the
     full number
     of ticks. gki_cb.com.OSNumOrigTicks is reset at the bottom of this function
     so changing this
     value only affects the timer updates below
   */
  gki_cb.com.OSNumOrigTicks -= gki_cb.com.OSTicksTilExp;

  /* Check for OS Task Timers */
  for (task_id = 0; task_id < GKI_MAX_TASKS; task_id++) {
    if (gki_cb.com.OSRdyTbl[task_id] == TASK_DEAD) {
      // task is shutdown do not try to service timers
      continue;
    }

    if (gki_cb.com.OSWaitTmr[task_id] > 0) /* If timer is running */
    {
      gki_cb.com.OSWaitTmr[task_id] -= gki_cb.com.OSNumOrigTicks;
      if (gki_cb.com.OSWaitTmr[task_id] <= 0) {
        /* Timer Expired */
        gki_cb.com.OSRdyTbl[task_id] = TASK_READY;
      }
    }

#if (GKI_NUM_TIMERS > 0)
    /* If any timer is running, decrement */
    if (gki_cb.com.OSTaskTmr0[task_id] > 0) {
      gki_cb.com.OSTaskTmr0[task_id] -= gki_cb.com.OSNumOrigTicks;

      if (gki_cb.com.OSTaskTmr0[task_id] <= 0) {
/* Set Timer 0 Expired event mask and reload timer */
#if (GKI_TIMER_UPDATES_FROM_ISR == TRUE)
        GKI_isend_event(task_id, TIMER_0_EVT_MASK);
#else
        GKI_send_event(task_id, TIMER_0_EVT_MASK);
#endif
        gki_cb.com.OSTaskTmr0[task_id] = gki_cb.com.OSTaskTmr0R[task_id];
      }
    }

    /* Check to see if this timer is the next one to expire */
    if (gki_cb.com.OSTaskTmr0[task_id] > 0 &&
        gki_cb.com.OSTaskTmr0[task_id] < next_expiration)
      next_expiration = gki_cb.com.OSTaskTmr0[task_id];
#endif

#if (GKI_NUM_TIMERS > 1)
    /* If any timer is running, decrement */
    if (gki_cb.com.OSTaskTmr1[task_id] > 0) {
      gki_cb.com.OSTaskTmr1[task_id] -= gki_cb.com.OSNumOrigTicks;

      if (gki_cb.com.OSTaskTmr1[task_id] <= 0) {
/* Set Timer 1 Expired event mask and reload timer */
#if (GKI_TIMER_UPDATES_FROM_ISR == TRUE)
        GKI_isend_event(task_id, TIMER_1_EVT_MASK);
#else
        GKI_send_event(task_id, TIMER_1_EVT_MASK);
#endif
        gki_cb.com.OSTaskTmr1[task_id] = gki_cb.com.OSTaskTmr1R[task_id];
      }
    }

    /* Check to see if this timer is the next one to expire */
    if (gki_cb.com.OSTaskTmr1[task_id] > 0 &&
        gki_cb.com.OSTaskTmr1[task_id] < next_expiration)
      next_expiration = gki_cb.com.OSTaskTmr1[task_id];
#endif

#if (GKI_NUM_TIMERS > 2)
    /* If any timer is running, decrement */
    if (gki_cb.com.OSTaskTmr2[task_id] > 0) {
      gki_cb.com.OSTaskTmr2[task_id] -= gki_cb.com.OSNumOrigTicks;

      if (gki_cb.com.OSTaskTmr2[task_id] <= 0) {
/* Set Timer 2 Expired event mask and reload timer */
#if (GKI_TIMER_UPDATES_FROM_ISR == TRUE)
        GKI_isend_event(task_id, TIMER_2_EVT_MASK);
#else
        GKI_send_event(task_id, TIMER_2_EVT_MASK);
#endif
        gki_cb.com.OSTaskTmr2[task_id] = gki_cb.com.OSTaskTmr2R[task_id];
      }
    }

    /* Check to see if this timer is the next one to expire */
    if (gki_cb.com.OSTaskTmr2[task_id] > 0 &&
        gki_cb.com.OSTaskTmr2[task_id] < next_expiration)
      next_expiration = gki_cb.com.OSTaskTmr2[task_id];
#endif

#if (GKI_NUM_TIMERS > 3)
    /* If any timer is running, decrement */
    if (gki_cb.com.OSTaskTmr3[task_id] > 0) {
      gki_cb.com.OSTaskTmr3[task_id] -= gki_cb.com.OSNumOrigTicks;

      if (gki_cb.com.OSTaskTmr3[task_id] <= 0) {
/* Set Timer 3 Expired event mask and reload timer */
#if (GKI_TIMER_UPDATES_FROM_ISR == TRUE)
        GKI_isend_event(task_id, TIMER_3_EVT_MASK);
#else
        GKI_send_event(task_id, TIMER_3_EVT_MASK);
#endif
        gki_cb.com.OSTaskTmr3[task_id] = gki_cb.com.OSTaskTmr3R[task_id];
      }
    }

    /* Check to see if this timer is the next one to expire */
    if (gki_cb.com.OSTaskTmr3[task_id] > 0 &&
        gki_cb.com.OSTaskTmr3[task_id] < next_expiration)
      next_expiration = gki_cb.com.OSTaskTmr3[task_id];
#endif
  }

  /* Set the next timer experation value if there is one to start */
  if (next_expiration < GKI_NO_NEW_TMRS_STARTED) {
    gki_cb.com.OSTicksTilExp = gki_cb.com.OSNumOrigTicks = next_expiration;
  } else {
    gki_cb.com.OSTicksTilExp = gki_cb.com.OSNumOrigTicks = 0;
  }

  gki_cb.com.timer_nesting = 0;

  GKI_enable();

  return;
}

/*******************************************************************************
**
** Function         GKI_timer_queue_empty
**
** Description      This function is called by applications to see whether the
**                  timer queue is empty
**
** Parameters
**
** Returns          bool
**
*******************************************************************************/
bool GKI_timer_queue_empty(void) {
  uint8_t tt;

  for (tt = 0; tt < GKI_MAX_TIMER_QUEUES; tt++) {
    if (gki_cb.com.timer_queues[tt]) return false;
  }

  return true;
}

/*******************************************************************************
**
** Function         GKI_timer_queue_register_callback
**
** Description      This function is called by applications to register system
**                  tick start/stop callback for time queues
**
**
** Parameters       p_callback - (input) pointer to the system tick callback
**
** Returns          bool
**
*******************************************************************************/
void GKI_timer_queue_register_callback(SYSTEM_TICK_CBACK* p_callback) {
  gki_cb.com.p_tick_cb = p_callback;

  return;
}

/*******************************************************************************
**
** Function         GKI_init_timer_list
**
** Description      This function is called by applications when they
**                  want to initialize a timer list.
**
** Parameters       p_timer_listq - (input) pointer to the timer list queue
**                                          object
**
** Returns          void
**
*******************************************************************************/
void GKI_init_timer_list(TIMER_LIST_Q* p_timer_listq) {
  p_timer_listq->p_first = nullptr;
  p_timer_listq->p_last = nullptr;
  p_timer_listq->last_ticks = 0;

  return;
}

/*******************************************************************************
**
** Function         GKI_init_timer_list_entry
**
** Description      This function is called by the applications when they
**                  want to initialize a timer list entry. This must be
**                  done prior to first use of the entry.
**
** Parameters       p_tle - (input) pointer to a timer list queue entry
**
** Returns          void
**
*******************************************************************************/
void GKI_init_timer_list_entry(TIMER_LIST_ENT* p_tle) {
  p_tle->p_next = nullptr;
  p_tle->p_prev = nullptr;
  p_tle->ticks = GKI_UNUSED_LIST_ENTRY;
  p_tle->in_use = false;
}

/*******************************************************************************
**
** Function         GKI_update_timer_list
**
** Description      This function is called by the applications when they
**                  want to update a timer list. This should be at every
**                  timer list unit tick, e.g. once per sec, once per minute
**                  etc.
**
** Parameters       p_timer_listq - (input) pointer to the timer list queue
**                  object
**                  num_units_since_last_update - (input) number of units since
**                  the last update (allows for variable unit update)
**
** NOTE: The following timer list update routines should not be used for exact
**       time critical purposes.  The timer tasks should be used when exact
**       timing is needed.
**
** Returns          the number of timers that have expired
**
*******************************************************************************/
uint16_t GKI_update_timer_list(TIMER_LIST_Q* p_timer_listq,
                               int32_t num_units_since_last_update) {
  TIMER_LIST_ENT* p_tle;
  uint16_t num_time_out = 0;
  int32_t rem_ticks;
  int32_t temp_ticks;

  p_tle = p_timer_listq->p_first;

  /* First, get the guys who have previously timed out */
  /* Note that the tick value of the timers should always be '0' */
  while ((p_tle) && (p_tle->ticks <= 0)) {
    num_time_out++;
    p_tle = p_tle->p_next;
  }

  /* Timer entriy tick values are relative to the preceeding entry */
  rem_ticks = num_units_since_last_update;

  /* Now, adjust remaining timer entries */
  while ((p_tle != nullptr) && (rem_ticks > 0)) {
    temp_ticks = p_tle->ticks;
    p_tle->ticks -= rem_ticks;

    /* See if this timer has just timed out */
    if (p_tle->ticks <= 0) {
      /* We set the number of ticks to '0' so that the legacy code
       * that assumes a '0' or nonzero value will still work as coded. */
      p_tle->ticks = 0;

      num_time_out++;
    }

    rem_ticks -= temp_ticks; /* Decrement the remaining ticks to process */
    p_tle = p_tle->p_next;
  }

  if (p_timer_listq->last_ticks > 0) {
    p_timer_listq->last_ticks -= num_units_since_last_update;

    /* If the last timer has expired set last_ticks to 0 so that other list
     * update
     * functions will calculate correctly
     */
    if (p_timer_listq->last_ticks < 0) p_timer_listq->last_ticks = 0;
  }

  return (num_time_out);
}

bool GKI_timer_list_empty(TIMER_LIST_Q* p_timer_listq) {
  return p_timer_listq->p_first == nullptr;
}

TIMER_LIST_ENT* GKI_timer_list_first(TIMER_LIST_Q* p_timer_listq) {
  return p_timer_listq->p_first;
}

/*******************************************************************************
**
** Function         GKI_get_remaining_ticks
**
** Description      This function is called by an application to get remaining
**                  ticks to expire
**
** Parameters       p_timer_listq - (input) pointer to the timer list queue
**                                          object
**                  p_target_tle - (input) pointer to a timer list queue entry
**
** Returns          0 if timer is not used or timer is not in the list
**                  remaining ticks if success
**
*******************************************************************************/
uint32_t GKI_get_remaining_ticks(TIMER_LIST_Q* p_timer_listq,
                                 TIMER_LIST_ENT* p_target_tle) {
  TIMER_LIST_ENT* p_tle;
  uint32_t rem_ticks = 0;

  if (p_target_tle->in_use) {
    p_tle = p_timer_listq->p_first;

    /* adding up all of ticks in previous entries */
    while ((p_tle) && (p_tle != p_target_tle)) {
      rem_ticks += p_tle->ticks;
      p_tle = p_tle->p_next;
    }

    /* if found target entry */
    if ((p_tle != nullptr) && (p_tle == p_target_tle)) {
      rem_ticks += p_tle->ticks;
    } else {
      LOG(ERROR) << StringPrintf(
          "GKI_get_remaining_ticks: No timer entry in the list");
      return (0);
    }
  } else {
    LOG(ERROR) << StringPrintf(
        "GKI_get_remaining_ticks: timer entry is not active");
  }

  return (rem_ticks);
}

/*******************************************************************************
**
** Function         GKI_add_to_timer_list
**
** Description      This function is called by an application to add a timer
**                  entry to a timer list.
**
**                  Note: A timer value of '0' will effectively insert an
**                        already expired event.  Negative tick values will be
**                        ignored.
**
** Parameters       p_timer_listq - (input) pointer to the timer list queue
**                                          object
**                  p_tle - (input) pointer to a timer list queue entry
**
** Returns          void
**
*******************************************************************************/
void GKI_add_to_timer_list(TIMER_LIST_Q* p_timer_listq, TIMER_LIST_ENT* p_tle) {
  uint32_t nr_ticks_total;
  uint8_t tt;
  TIMER_LIST_ENT* p_temp;
  if (p_tle == nullptr || p_timer_listq == nullptr) {
    LOG(VERBOSE) << StringPrintf(
        "%s: invalid argument %p, %p****************************<<", __func__,
        p_timer_listq, p_tle);
    return;
  }

  /* Only process valid tick values */
  if (p_tle->ticks >= 0) {
    /* If this entry is the last in the list */
    if (p_tle->ticks >= p_timer_listq->last_ticks) {
      /* If this entry is the only entry in the list */
      if (p_timer_listq->p_first == nullptr)
        p_timer_listq->p_first = p_tle;
      else {
        /* Insert the entry onto the end of the list */
        if (p_timer_listq->p_last != nullptr)
          p_timer_listq->p_last->p_next = p_tle;

        p_tle->p_prev = p_timer_listq->p_last;
      }

      p_tle->p_next = nullptr;
      p_timer_listq->p_last = p_tle;
      nr_ticks_total = p_tle->ticks;
      p_tle->ticks -= p_timer_listq->last_ticks;

      p_timer_listq->last_ticks = nr_ticks_total;
    } else /* This entry needs to be inserted before the last entry */
    {
      /* Find the entry that the new one needs to be inserted in front of */
      p_temp = p_timer_listq->p_first;
      while (p_tle->ticks > p_temp->ticks) {
        /* Update the tick value if looking at an unexpired entry */
        if (p_temp->ticks > 0) p_tle->ticks -= p_temp->ticks;

        p_temp = p_temp->p_next;
      }

      /* The new entry is the first in the list */
      if (p_temp == p_timer_listq->p_first) {
        p_tle->p_next = p_timer_listq->p_first;
        p_timer_listq->p_first->p_prev = p_tle;
        p_timer_listq->p_first = p_tle;
      } else {
        p_temp->p_prev->p_next = p_tle;
        p_tle->p_prev = p_temp->p_prev;
        p_temp->p_prev = p_tle;
        p_tle->p_next = p_temp;
      }
      p_temp->ticks -= p_tle->ticks;
    }

    p_tle->in_use = true;

    /* if we already add this timer queue to the array */
    for (tt = 0; tt < GKI_MAX_TIMER_QUEUES; tt++) {
      if (gki_cb.com.timer_queues[tt] == p_timer_listq) return;
    }
    /* add this timer queue to the array */
    for (tt = 0; tt < GKI_MAX_TIMER_QUEUES; tt++) {
      if (gki_cb.com.timer_queues[tt] == nullptr) break;
    }
    if (tt < GKI_MAX_TIMER_QUEUES) {
      gki_cb.com.timer_queues[tt] = p_timer_listq;
    }
  }

  return;
}

/*******************************************************************************
**
** Function         GKI_remove_from_timer_list
**
** Description      This function is called by an application to remove a timer
**                  entry from a timer list.
**
** Parameters       p_timer_listq  - (input) pointer to the timer list queue
**                                            object
**                  p_tle - (input) pointer to a timer list queue entry
**
** Returns          void
**
*******************************************************************************/
void GKI_remove_from_timer_list(TIMER_LIST_Q* p_timer_listq,
                                TIMER_LIST_ENT* p_tle) {
  uint8_t tt;

  /* Verify that the entry is valid */
  if (p_tle == nullptr || p_tle->in_use == false ||
      p_timer_listq->p_first == nullptr) {
    return;
  }

  /* Add the ticks remaining in this timer (if any) to the next guy in the list.
  ** Note: Expired timers have a tick value of '0'.
  */
  if (p_tle->p_next != nullptr) {
    p_tle->p_next->ticks += p_tle->ticks;
  } else {
    p_timer_listq->last_ticks -= p_tle->ticks;
  }

  /* Unlink timer from the list. */
  if (p_timer_listq->p_first == p_tle) {
    p_timer_listq->p_first = p_tle->p_next;

    if (p_timer_listq->p_first != nullptr)
      p_timer_listq->p_first->p_prev = nullptr;

    if (p_timer_listq->p_last == p_tle) p_timer_listq->p_last = nullptr;
  } else {
    if (p_timer_listq->p_last == p_tle) {
      p_timer_listq->p_last = p_tle->p_prev;

      if (p_timer_listq->p_last != nullptr)
        p_timer_listq->p_last->p_next = nullptr;
    } else {
      if (p_tle->p_next != nullptr && p_tle->p_next->p_prev == p_tle)
        p_tle->p_next->p_prev = p_tle->p_prev;
      else {
        /* Error case - chain messed up ?? */
        return;
      }

      if (p_tle->p_prev != nullptr && p_tle->p_prev->p_next == p_tle)
        p_tle->p_prev->p_next = p_tle->p_next;
      else {
        /* Error case - chain messed up ?? */
        return;
      }
    }
  }

  p_tle->p_next = p_tle->p_prev = nullptr;
  p_tle->ticks = GKI_UNUSED_LIST_ENTRY;
  p_tle->in_use = false;

  /* if timer queue is empty */
  if (p_timer_listq->p_first == nullptr && p_timer_listq->p_last == nullptr) {
    for (tt = 0; tt < GKI_MAX_TIMER_QUEUES; tt++) {
      if (gki_cb.com.timer_queues[tt] == p_timer_listq) {
        gki_cb.com.timer_queues[tt] = nullptr;
        break;
      }
    }
    /* Recovering from unexpected state.
       e.g. when TIMER_LIST_ENT is cleared before stop */
    if (p_timer_listq->last_ticks) p_timer_listq->last_ticks = 0;
  }

  return;
}

/*******************************************************************************
**
** Function         gki_adjust_timer_count
**
** Description      This function is called whenever a new timer or GKI_wait
**                  occurs to adjust (if necessary) the current time til the
**                  first expiration. This only needs to make an adjustment if
**                  the new timer (in ticks) is less than the number of ticks
**                  remaining on the current timer.
**
** Parameters:      ticks - (input) number of system ticks of the new timer
**                                  entry
**
**                  NOTE:  This routine MUST be called while interrupts are
**                         disabled to avoid updates while adjusting the timer
**                         variables.
**
** Returns          void
**
*******************************************************************************/
void gki_adjust_timer_count(int32_t ticks) {
  if (ticks > 0) {
    /* See if the new timer expires before the current first expiration */
    if (gki_cb.com.OSNumOrigTicks == 0 ||
        (ticks < gki_cb.com.OSTicksTilExp && gki_cb.com.OSTicksTilExp > 0)) {
      gki_cb.com.OSNumOrigTicks =
          (gki_cb.com.OSNumOrigTicks - gki_cb.com.OSTicksTilExp) + ticks;
      gki_cb.com.OSTicksTilExp = ticks;
    }
  }

  return;
}