/****************************************************************************
 * configs/stm32f4discovery/src/stm32_pm_buttons.c
 *
 *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
 *   Authors: Gregory Nutt <gnutt@nuttx.org>
 *            Diego Sanchez <dsanchez@nx-engineering.com>
 *
 * 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 <arch/board/board.h>
#include <nuttx/config.h>

#include <nuttx/power/pm.h>
#include <arch/irq.h>
#include <stdbool.h>
#include <debug.h>

#include "up_arch.h"
#include "nvic.h"
#include "stm32_pwr.h"
#include "stm32_pm.h"
#include "stm32f4discovery.h"

#if defined(CONFIG_PM) && defined(CONFIG_ARCH_IDLE_CUSTOM) && defined(CONFIG_PM_BUTTONS)

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
/* Configuration ************************************************************/

#ifndef CONFIG_ARCH_BUTTONS
#  error "CONFIG_ARCH_BUTTONS is not defined in the configuration"
#endif

#ifndef CONFIG_ARCH_IRQBUTTONS
#  warning "CONFIG_ARCH_IRQBUTTONS is not defined in the configuration"
#endif

#ifndef CONFIG_PM_BUTTON_ACTIVITY
#  define CONFIG_PM_BUTTON_ACTIVITY 10
#endif

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

#ifdef CONFIG_ARCH_IRQBUTTONS
static int button_handler(int irq, FAR void *context);
#endif /* CONFIG_ARCH_IRQBUTTONS */

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: button_handler
 *
 * Description:
 *   Handle a button wake-up interrupt
 *
 ****************************************************************************/

#ifdef CONFIG_ARCH_IRQBUTTONS
static int button_handler(int irq, FAR void *context)
{
  /* At this point the MCU should have already awakened.  The state
   * change will be handled in the IDLE loop when the system is re-awakened
   * The button interrupt handler should be totally ignorant of the PM
   * activities and should report button activity as if nothing
   * special happened.
   */

  pm_activity(CONFIG_PM_BUTTON_ACTIVITY);
  return OK;
}
#endif /* CONFIG_ARCH_IRQBUTTONS */

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: stm32_pm_buttons
 *
 * Description:
 *   Configure the user button of the STM32f4discovery board as EXTI,
 *   so it is able to wakeup the MCU from the PM_STANDBY mode
 *
 ****************************************************************************/

void stm32_pm_buttons(void)
{
  /* Initialize the button GPIOs */

  board_button_initialize();

#ifdef CONFIG_ARCH_IRQBUTTONS
      xcpt_t oldhandler = board_button_irq(0, button_handler);

      if (oldhandler != NULL)
        {
          lowsyslog("WARNING: oldhandler:%p is not NULL!  "
                        "Button events may be lost or aliased!\n",
                        oldhandler);
        }
#endif
}

#endif /* CONFIG_PM && CONFIG_ARCH_IDLE_CUSTOM && CONFIG_PM_BUTTONS)*/
