153 lines
5.3 KiB
C
153 lines
5.3 KiB
C
/****************************************************************************
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* drivers/power/pm_activity.c
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*
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* Copyright (C) 2011-2012, 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <assert.h>
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#include <nuttx/power/pm.h>
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#include <nuttx/clock.h>
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#include <nuttx/irq.h>
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#include "pm.h"
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#ifdef CONFIG_PM
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pm_activity
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*
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* Description:
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* This function is called by a device driver to indicate that it is
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* performing meaningful activities (non-idle). This increments an activity
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* count and/or will restart a idle timer and prevent entering reduced
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* power states.
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*
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* Input Parameters:
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* domain - The domain of the PM activity
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* priority - Activity priority, range 0-9. Larger values correspond to
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* higher priorities. Higher priority activity can prevent the system
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* from entering reduced power states for a longer period of time.
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*
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* As an example, a button press might be higher priority activity because
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* it means that the user is actively interacting with the device.
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*
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* Returned Value:
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* None.
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*
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* Assumptions:
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* This function may be called from an interrupt handler (this is the ONLY
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* PM function that may be called from an interrupt handler!).
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*
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****************************************************************************/
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void pm_activity(int domain, int priority)
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{
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FAR struct pm_domain_s *pdom;
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systime_t now;
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uint32_t accum;
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irqstate_t flags;
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/* Get a convenience pointer to minimize all of the indexing */
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DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS);
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pdom = &g_pmglobals.domain[domain];
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/* Just increment the activity count in the current time slice. The priority
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* is simply the number of counts that are added.
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*/
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if (priority > 0)
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{
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/* Add the priority to the accumulated counts in a critical section. */
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flags = enter_critical_section();
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accum = (uint32_t)pdom->accum + priority;
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/* Make sure that we do not overflow the underlying uint16_t representation */
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if (accum > INT16_MAX)
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{
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accum = INT16_MAX;
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}
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/* Save the updated count */
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pdom->accum = (int16_t)accum;
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/* Check the elapsed time. In periods of low activity, time slicing is
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* controlled by IDLE loop polling; in periods of higher activity, time
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* slicing is controlled by driver activity. In either case, the duration
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* of the time slice is only approximate; during times of heavy activity,
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* time slices may be become longer and the activity level may be over-
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* estimated.
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*/
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now = clock_systimer();
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if (now - pdom->stime >= TIME_SLICE_TICKS)
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{
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int16_t tmp;
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/* Sample the count, reset the time and count, and assess the PM
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* state. This is an atomic operation because interrupts are
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* still disabled.
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*/
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tmp = pdom->accum;
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pdom->stime = now;
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pdom->accum = 0;
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/* Reassessing the PM state may require some computation. However,
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* the work will actually be performed on a worker thread at a user-
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* controlled priority.
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*/
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(void)pm_update(domain, tmp);
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}
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leave_critical_section(flags);
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}
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}
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#endif /* CONFIG_PM */
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