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/****************************************************************************
* arch/arm/src/stm32/stm32_rtc_lowerhalf.c
*
* Copyright (C) 2015 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 <sys/types.h>
#include <stdbool.h>
#include <errno.h>
#include <nuttx/arch.h>
#include <nuttx/rtc.h>
#include "chip.h"
#include "stm32_rtc.h"
#ifdef CONFIG_RTC_DRIVER
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/* This is the private type for the RTC state. It must be cast compatible
* with struct rtc_lowerhalf_s.
*/
struct stm32_lowerhalf_s
{
/* This is the contained reference to the read-only, lower-half
* operations vtable (which may lie in FLASH or ROM)
*/
FAR const struct rtc_ops_s *ops;
/* Data following is private to this driver and not visible outside of
* this file.
*/
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Prototypes for static methods in struct rtc_ops_s */
static int stm32_rdtime(FAR struct rtc_lowerhalf_s *lower,
FAR struct rtc_time *rtctime);
static int stm32_settime(FAR struct rtc_lowerhalf_s *lower,
FAR const struct rtc_time *rtctime);
/****************************************************************************
* Private Data
****************************************************************************/
/* STM32 RTC driver operations */
static const struct rtc_ops_s g_rtc_ops =
{
.rdtime = stm32_rdtime,
.settime = stm32_settime,
#ifdef CONFIG_RTC_ALARM
.almread = NULL,
.almset = NULL,
#endif
#ifdef CONFIG_RTC_PERIODIC
.irqpread = NULL,
.irqpset = NULL,
#endif
#ifdef CONFIG_RTC_ALARM
.aie = NULL,
#endif
#ifdef CONFIG_RTC_ONESEC
.uie = NULL,
#endif
#ifdef CONFIG_RTC_PERIODIC
.pie = NULL,
#endif
#ifdef CONFIG_RTC_EPOCHYEAR
.rdepoch = NULL,
.setepoch = NULL,
#endif
#ifdef CONFIG_RTC_ALARM
.rdwkalm = NULL,
.setwkalm = NULL,
#endif
#ifdef CONFIG_RTC_IOCTL
.ioctl = NULL,
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
.destroy = NULL,
#endif
};
/* STM32 RTC device state */
static struct stm32_lowerhalf_s g_rtc_lowerhalf =
{
.ops = &g_rtc_ops,
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_rdtime
*
* Description:
* Implements the rdtime() method of the RTC driver interface
*
* Input Parameters:
* lower - A reference to RTC lower half driver state structure
* rcttime - The location in which to return the current RTC time.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on any failure.
*
****************************************************************************/
static int stm32_rdtime(FAR struct rtc_lowerhalf_s *lower,
FAR struct rtc_time *rtctime)
{
#if defined(CONFIG_RTC_DATETIME)
/* This operation depends on the fact that struct rtc_time is cast
* compatible with struct tm.
*/
return up_rtc_getdatetime((FAR struct tm *)rtctime);
#elif defined(CONFIG_RTC_HIRES)
FAR struct timespec ts;
int ret;
/* Get the higher resolution time */
ret = up_rtc_gettime(&ts);
if (ret < 0)
{
goto errout_with_errno;
}
/* Convert the one second epoch time to a struct tm. This operation
* depends on the fact that struct rtc_time and struct tm are cast
* compatible.
*/
if (!gmtime_r(&ts.tv_sec, (FAR struct tm *)rtctime))
{
goto errout_with_errno;
}
return OK;
errout_with_errno:
ret = get_errno();
DEBUGASSERT(ret > 0);
return -ret;
#else
FAR struct time_t timer;
/* The resolution of time is only 1 second */
timer = up_rtc_time();
/* Convert the one second epoch time to a struct tm */
if (!gmtime_r(&timer, rtctime)
{
int errcode = get_errno();
DEBUGASSERT(errcode > 0);
return -errcode;
}
return OK;
#endif
}
/****************************************************************************
* Name: stm32_settime
*
* Description:
* Implements the settime() method of the RTC driver interface
*
* Input Parameters:
* lower - A reference to RTC lower half driver state structure
* rcttime - The new time to set
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on any failure.
*
****************************************************************************/
static int stm32_settime(FAR struct rtc_lowerhalf_s *lower,
FAR const struct rtc_time *rtctime)
{
#ifdef CONFIG_RTC_DATETIME
/* This operation depends on the fact that struct rtc_time is cast
* compatible with struct tm.
*/
return stm32_rtc_setdatetime((FAR const struct tm *)rtctime);
#else
struct timespec ts;
/* Convert the struct rtc_time to a time_t. Here we assume that struct
* rtc_time is cast compatible with struct tm.
*/
ts.tv_sec = mktime((FAR struct tm *)rtctime);
ts.tv_nsec = 0;
/* Now set the time (to one second accuracy) */
return up_rtc_settime(&ts);
#endif
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_rtc_lowerhalf
*
* Description:
* Instantiate the RTC lower half driver for the STM32. General usage:
*
* #include <nuttx/rtc.h>
* #include "stm32_rtc.h>
*
* struct rtc_lowerhalf_s *lower;
* lower = stm32_rtc_lowerhalf();
* rtc_initialize(0, lower);
*
* Input Parameters:
* None
*
* Returned Value:
* On success, a non-NULL RTC lower interface is returned. NULL is
* returned on any failure.
*
****************************************************************************/
FAR struct rtc_lowerhalf_s *stm32_rtc_lowerhalf(void)
{
return (FAR struct rtc_lowerhalf_s *)&g_rtc_lowerhalf;
}
#endif /* CONFIG_RTC_DRIVER */
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