81 lines
3.1 KiB
C
81 lines
3.1 KiB
C
/****************************************************************************
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* drivers/power/pm_checkstate.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <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_checkstate
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*
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* Description:
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* This function is called from the MCU-specific IDLE loop to monitor the
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* the power management conditions. This function returns the
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* "recommended" power management state based on the PM policy applied by
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* the currently chosen governor. The IDLE loop must call pm_changestate()
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* in order to make the state change, which will interact with all drivers
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* registered with the PM system.
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*
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* These two steps are separated because the plaform-specific IDLE loop may
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* have additional situational information that is not available to the
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* the PM sub-system. For example, the IDLE loop may know that the
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* battery charge level is very low and may force lower power states
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* even if there is activity.
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*
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* NOTE: That these two steps are separated in time and, hence, the IDLE
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* loop could be suspended for a long period of time between calling
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* pm_checkstate() and pm_changestate(). The IDLE loop may need to make
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* these calls atomic by either disabling interrupts until the state change
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* is completed.
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*
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* Input Parameters:
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* domain - the PM domain to check
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*
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* Returned Value:
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* The recommended power management state.
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*
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****************************************************************************/
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enum pm_state_e pm_checkstate(int domain)
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{
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DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS &&
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g_pmglobals.governor->checkstate);
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return g_pmglobals.governor->checkstate(domain);
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}
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#endif /* CONFIG_PM */
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