nuttx/drivers/power/pm_activity.c

/****************************************************************************
 * drivers/power/pm_activity.c
 *
 *   Copyright (C) 2011-2012, 2016 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *   Author: Matias Nitsche <mnitsche@dc.uba.ar>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <assert.h>

#include <nuttx/power/pm.h>
#include <nuttx/clock.h>
#include <nuttx/irq.h>

#include "pm.h"

#ifdef CONFIG_PM

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: pm_activity
 *
 * Description:
 *   This function is called by a device driver to indicate that it is
 *   performing meaningful activities (non-idle).  This increments an activity
 *   count and/or will restart a idle timer and prevent entering reduced
 *   power states.
 *
 * Input Parameters:
 *   domain - The domain of the PM activity
 *   priority - Activity priority, range 0-9.  Larger values correspond to
 *     higher priorities.  Higher priority activity can prevent the system
 *     from entering reduced power states for a longer period of time.
 *
 *     As an example, a button press might be higher priority activity because
 *     it means that the user is actively interacting with the device.
 *
 * Returned Value:
 *   None.
 *
 * Assumptions:
 *   This function may be called from an interrupt handler (this is the ONLY
 *   PM function that may be called from an interrupt handler!).
 *
 ****************************************************************************/

void pm_activity(int domain, int priority)
{
  if (g_pmglobals.governor->activity)
    {
      g_pmglobals.governor->activity(domain, priority);
    }
}

/****************************************************************************
 * Name: pm_stay
 *
 * Description:
 *   This function is called by a device driver to indicate that it is
 *   performing meaningful activities (non-idle), needs the power at kept
 *   last the specified level.
 *
 * Input Parameters:
 *   domain - The domain of the PM activity
 *   state - The state want to stay.
 *
 *     As an example, media player might stay in normal state during playback.
 *
 * Returned Value:
 *   None.
 *
 * Assumptions:
 *   This function may be called from an interrupt handler.
 *
 ****************************************************************************/

void pm_stay(int domain, enum pm_state_e state)
{
  FAR struct pm_domain_s *pdom;
  irqstate_t flags;

  /* Get a convenience pointer to minimize all of the indexing */

  DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS);
  pdom = &g_pmglobals.domain[domain];

  flags = enter_critical_section();
  DEBUGASSERT(state < PM_COUNT);
  DEBUGASSERT(pdom->stay[state] < UINT16_MAX);
  pdom->stay[state]++;
  leave_critical_section(flags);
}

/****************************************************************************
 * Name: pm_relax
 *
 * Description:
 *   This function is called by a device driver to indicate that it is
 *   idle now, could relax the previous requested power level.
 *
 * Input Parameters:
 *   domain - The domain of the PM activity
 *   state - The state want to relax.
 *
 *     As an example, media player might relax power level after playback.
 *
 * Returned Value:
 *   None.
 *
 * Assumptions:
 *   This function may be called from an interrupt handler.
 *
 ****************************************************************************/

void pm_relax(int domain, enum pm_state_e state)
{
  FAR struct pm_domain_s *pdom;
  irqstate_t flags;

  /* Get a convenience pointer to minimize all of the indexing */

  DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS);
  pdom = &g_pmglobals.domain[domain];

  flags = enter_critical_section();
  DEBUGASSERT(state < PM_COUNT);
  DEBUGASSERT(pdom->stay[state] > 0);
  pdom->stay[state]--;
  leave_critical_section(flags);
}

/****************************************************************************
 * Name: pm_staycount
 *
 * Description:
 *   This function is called to get current stay count.
 *
 * Input Parameters:
 *   domain - The domain of the PM activity
 *   state - The state want to relax.
 *
 * Returned Value:
 *   Current pm stay count
 *
 * Assumptions:
 *   This function may be called from an interrupt handler.
 *
 ****************************************************************************/

uint32_t pm_staycount(int domain, enum pm_state_e state)
{
  FAR struct pm_domain_s *pdom;

  /* Get a convenience pointer to minimize all of the indexing */

  DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS);
  pdom = &g_pmglobals.domain[domain];

  return pdom->stay[state];
}

#endif /* CONFIG_PM */