/************************************************************************
* sched/clock_settime.c
*
* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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/rtc.h>
#include <time.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include "clock_internal.h"
/************************************************************************
* Definitions
************************************************************************/
/************************************************************************
* Private Type Declarations
************************************************************************/
/************************************************************************
* Private Function Prototypes
************************************************************************/
/**********************************************************************
* Public Constant Data
**********************************************************************/
/************************************************************************
* Public Variables
************************************************************************/
/**********************************************************************
* Private Variables
**********************************************************************/
/************************************************************************
* Private Functions
************************************************************************/
/************************************************************************
* Public Functions
************************************************************************/
/************************************************************************
* Function: clock_settime
*
* Description:
* Clock Functions based on POSIX APIs
*
************************************************************************/
int clock_settime(clockid_t clock_id, FAR const struct timespec *tp)
{
int ret = OK;
sdbg("clock_id=%d\n", clock_id);
/* CLOCK_REALTIME - POSIX demands this to be present. This is the wall
* time clock.
*/
if (clock_id == CLOCK_REALTIME && tp)
{
#ifndef CONFIG_SYSTEM_UTC
/* Save the new base time. */
g_basetime.tv_sec = tp->tv_sec;
g_basetime.tv_nsec = tp->tv_nsec;
/* Get the elapsed time since power up (in milliseconds) biased
* as appropriate.
*/
g_tickbias = clock_systimer();
#else /* if CONFIG_SYSTEM_UTC=y */
/* We ignore everything below one second in time configuration */
#ifdef CONFIG_RTC
if (g_rtc_enabled)
{
up_rtc_settime(tp);
}
else
#endif
{
g_system_utc = tp->tv_sec;
}
#endif
sdbg("basetime=(%d,%d) tickbias=%d\n",
(int)g_basetime.tv_sec, (int)g_basetime.tv_nsec,
(int)g_tickbias);
}
/* CLOCK_ACTIVETIME is non-standard. Returns active UTC time, which is
* disabled during power down modes. Unit is 1 second.
*/
#ifdef CONFIG_SYSTEM_UTC
else if (clock_id == CLOCK_ACTIVETIME && tp)
{
irqstate_t flags;
uint32_t tickcount;
/* Calculate the number of ticks correspond to the nanosecond count...
* exercising care to avoid overflows. This could still overflow
* if CLOCKS_PER_SEC is very large (something like 4096).
*/
tickcount = ((tp->tv_nsec >> 10) * CLOCKS_PER_SEC) / (1000000000 >> 10);
/* Then set the UTC time (seconds) plus the tickcount (fractional seconds */
flags = irqsave();
g_system_utc = tp->tv_sec;
g_tickcount = tickcount;
irqrestore(flags);
}
#endif
else
{
sdbg("Returning ERROR\n");
set_errno(EINVAL);
ret = ERROR;
}
return ret;
}
