212 lines
7.1 KiB
C
212 lines
7.1 KiB
C
/****************************************************************************
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* drivers/power/pm
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*
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* Copyright (C) 2011-2012 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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#ifndef __DRIVERS_POWER_PM_H
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#define __DRIVERS_POWER_PM_H
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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 <semaphore.h>
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#include <queue.h>
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#include <nuttx/clock.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/power/pm.h>
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#ifdef CONFIG_PM
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifndef CONFIG_SCHED_WORKQUEUE
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# warning "Worker thread support is required (CONFIG_SCHED_WORKQUEUE)"
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#endif
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/* Convert the time slice interval into system clock ticks.
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*
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* CONFIG_PM_SLICEMS provides the duration of one time slice in milliseconds.
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* CLOCKS_PER_SEC provides the number of timer ticks in one second.
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*
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* slice ticks = (CONFIG_PM_SLICEMS msec / 1000 msec/sec) /
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* (CLOCKS_PER_SEC ticks/sec)
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*/
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#define TIME_SLICE_TICKS ((CONFIG_PM_SLICEMS * CLOCKS_PER_SEC) / 1000)
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/* Function-like macros *****************************************************/
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/****************************************************************************
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* Name: pm_lock
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*
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* Descripton:
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* Lock the power management registry. NOTE: This function may return
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* an error if a signal is received while what (errno == EINTR).
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*
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****************************************************************************/
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#define pm_lock() sem_wait(&g_pmglobals.regsem);
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/****************************************************************************
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* Name: pm_unlock
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*
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* Descripton:
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* Unlock the power management registry.
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*
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****************************************************************************/
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#define pm_unlock() sem_post(&g_pmglobals.regsem);
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This structure encapsulates all of the global data used by the PM module */
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struct pm_global_s
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{
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/* state - The current state (as determined by an explicit call to
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* pm_changestate()
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* recommended - The recommended state based on the PM algorithm in
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* function pm_update().
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* mndex - The index to the next slot in the memory[] array to use.
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* mcnt - A tiny counter used only at start up. The actual
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* algorithm cannot be applied until CONFIG_PM_MEMORY
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* samples have been collected.
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*/
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uint8_t state;
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uint8_t recommended;
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uint8_t mndx;
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uint8_t mcnt;
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/* accum - The accumulated counts in this time interval
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* thrcnt - The number of below threshold counts seen.
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*/
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int16_t accum;
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uint16_t thrcnt;
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/* This is the averaging "memory." The averaging algorithm is simply:
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* Y = (An*X + SUM(Ai*Yi))/SUM(Aj), where i = 1..n-1 and j= 1..n, n is the
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* length of the "memory", Ai is the weight applied to each value, and X is
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* the current activity.
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*
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* CONFIG_PM_MEMORY provides the memory for the algorithm. Default: 2
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* CONFIG_PM_COEFn provides weight for each sample. Default: 1
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*/
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#if CONFIG_PM_MEMORY > 1
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int16_t memory[CONFIG_PM_MEMORY-1];
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#endif
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/* stime - The time (in ticks) at the start of the current time slice */
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systime_t stime;
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/* This semaphore manages mutually exclusive access to the power management
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* registry. It must be initialized to the value 1.
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*/
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sem_t regsem;
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/* For work that has been deferred to the worker thread */
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struct work_s work;
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/* registry is a singly-linked list of registered power management
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* callback structures. To ensure mutually exclusive access, this list
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* must be locked by calling pm_lock() before it is accessed.
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*/
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sq_queue_t registry;
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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# define EXTERN extern "C"
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extern "C"
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{
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#else
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# define EXTERN extern
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#endif
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/* All PM global data: */
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EXTERN struct pm_global_s g_pmglobals;
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/************************************************************************************
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* Public Function Prototypes
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************************************************************************************/
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/****************************************************************************
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* Name: pm_update
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*
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* Description:
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* This internal function is called at the end of a time slice in order to
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* update driver activity metrics and recommended states.
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*
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* Input Parameters:
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* accum - The value of the activity accumulator at the end of the time
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* slice.
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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 a driver, perhaps even at the interrupt
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* level. It may also be called from the IDLE loop at the lowest possible
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* priority level. To reconcile these various conditions, all work is
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* performed on the worker thread at a user-selectable priority.
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*
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****************************************************************************/
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EXTERN void pm_update(int16_t accum);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* CONFIG_PM */
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#endif /* #define __DRIVERS_POWER_PM_H */
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