149 lines
4.8 KiB
C
149 lines
4.8 KiB
C
/****************************************************************************
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* drivers/power/pm/greedy_governor.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 <sys/types.h>
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#include <stdbool.h>
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#include <string.h>
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#include <poll.h>
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#include <errno.h>
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#include <debug.h>
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#include <assert.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/signal.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/power/pm.h>
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#include <nuttx/power/power_ioctl.h>
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#include <nuttx/irq.h>
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#include "pm.h"
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* PM governor methods */
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static void greedy_governor_statechanged(int domain,
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enum pm_state_e newstate);
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static enum pm_state_e greedy_governor_checkstate(int domain);
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static void greedy_governor_activity(int domain, int count);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct pm_governor_s g_greedy_governor_ops =
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{
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NULL, /* initialize */
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NULL, /* deinitialize */
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greedy_governor_statechanged, /* statechanged */
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greedy_governor_checkstate, /* checkstate */
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greedy_governor_activity, /* activity */
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NULL /* priv */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: greedy_governor_statechanged
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****************************************************************************/
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static void greedy_governor_statechanged(int domain,
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enum pm_state_e newstate)
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{
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/* no need to react to state changes */
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UNUSED(domain);
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UNUSED(newstate);
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}
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/****************************************************************************
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* Name: user_governor_checkstate
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****************************************************************************/
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static enum pm_state_e greedy_governor_checkstate(int domain)
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{
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FAR struct pm_domain_s *pdom;
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irqstate_t flags;
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int state;
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pdom = &g_pmdomains[domain];
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state = PM_NORMAL;
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/* We disable interrupts since pm_stay()/pm_relax() could be simultaneously
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* invoked, which modifies the stay count which we are about to read
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*/
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flags = spin_lock_irqsave(&pdom->lock);
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/* Find the lowest power-level which is not locked. */
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while (dq_empty(&pdom->wakelock[state]) && state < (PM_COUNT - 1))
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{
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state++;
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}
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spin_unlock_irqrestore(&pdom->lock, flags);
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/* Return the found state */
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return state;
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}
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/****************************************************************************
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* Name: greedy_activity
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****************************************************************************/
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static void greedy_governor_activity(int domain, int count)
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{
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pm_staytimeout(domain, PM_NORMAL, (count ? count : 1) * 1000);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pm_greedy_governor_initialize
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*
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* Description:
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* Register the user_governor driver as the specified device.
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*
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* Returned Value:
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* Zero (OK) is returned on success. Otherwise a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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FAR const struct pm_governor_s *pm_greedy_governor_initialize(void)
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{
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return &g_greedy_governor_ops;
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}
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