/****************************************************************************
 * include/nuttx/timers/mcp794xx.h
 *
 *   Copyright (C) 2019 Abdelatif Guettouche. All rights reserved.
 *   Author: 2019 Abdelatif Guettouche <abdelatif.guettouche@gmail.com>
 *
 * This file is a part of NuttX:
 *
 *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
 *
 * 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.
 *
 ****************************************************************************/

#ifndef __INCLUDE_NUTTX_TIMERS_MCP794XX_H
#define __INCLUDE_NUTTX_TIMERS_MCP794XX_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#ifdef CONFIG_RTC_MCP794XX

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif

/****************************************************************************
 * Name: mcp794xx_rtc_initialize
 *
 * Description:
 *   Initialize the hardware RTC per the selected configuration.  This
 *   function is called once during the OS initialization sequence by board-
 *   specific logic.
 *
 *   After mcp794xx_rtc_initialize() is called, the OS function
 *   clock_synchronize() should also be called to synchronize the system
 *   timer to a hardware RTC.  That operation is normally performed
 *   automatically by the system during clock initialization.  However, when
 *   an external RTC is used, the board logic will need to explicitly re-
 *   synchronize the system timer to the RTC when the RTC becomes available.
 *
 * Input Parameters:
 *   i2c  - An instance of the I2C interface used to access the MCP794XX
 *          device
 *   addr - The (7-bit) I2C address of the MCP794XX device
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno on failure
 *
 ****************************************************************************/

struct i2c_master_s; /* Forward reference */
int mcp794xx_rtc_initialize(FAR struct i2c_master_s *i2c, uint8_t addr);

#undef EXTERN
#ifdef __cplusplus
}
#endif

#endif /* CONFIG_RTC_MCP794XX */
#endif /* __INCLUDE_NUTTX_TIMERS_MCP794XX_H */