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Diffstat (limited to 'nuttx/drivers/power/pm_activity.c')
| -rw-r--r-- | nuttx/drivers/power/pm_activity.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/nuttx/drivers/power/pm_activity.c b/nuttx/drivers/power/pm_activity.c deleted file mode 100644 index d3c8a52e7..000000000 --- a/nuttx/drivers/power/pm_activity.c +++ /dev/null @@ -1,166 +0,0 @@ -/**************************************************************************** - * drivers/power/pm_activity.c - * - * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * 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 <nuttx/power/pm.h> -#include <nuttx/clock.h> -#include <arch/irq.h> - -#include "pm_internal.h" - -#ifdef CONFIG_PM - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Types - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -/**************************************************************************** - * Public Data - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * 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: - * 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 priority) -{ - uint32_t now; - uint32_t accum; - irqstate_t flags; - - /* Just increment the activity count in the current time slice. The priority - * is simply the number of counts that are added. - */ - - if (priority > 0) - { - /* Add the priority to the accumulated counts in a critical section. */ - - flags = irqsave(); - accum = (uint32_t)g_pmglobals.accum + priority; - - /* Make sure that we do not overflow the underlying uint16_t representation */ - - if (accum > INT16_MAX) - { - accum = INT16_MAX; - } - - /* Save the updated count */ - - g_pmglobals.accum = (int16_t)accum; - - /* Check the elapsed time. In periods of low activity, time slicing is - * controlled by IDLE loop polling; in periods of higher activity, time - * slicing is controlled by driver activity. In either case, the duration - * of the time slice is only approximate; during times of heavy activity, - * time slices may be become longer and the activity level may be over- - * estimated. - */ - - now = clock_systimer(); - if (now - g_pmglobals.stime >= TIME_SLICE_TICKS) - { - int16_t tmp; - - /* Sample the count, reset the time and count, and assess the PM - * state. This is an atomic operation because interrupts are - * still disabled. - */ - - tmp = g_pmglobals.accum; - g_pmglobals.stime = now; - g_pmglobals.accum = 0; - - /* Reassessing the PM state may require some computation. However, - * the work will actually be performed on a worker thread at a user- - * controlled priority. - */ - - (void)pm_update(accum); - } - - irqrestore(flags); - } -} - -#endif /* CONFIG_PM */
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