text: /*-
   * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
   * 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.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: src/sys/i386/isa/pmtimer.c,v 1.5 2004/05/30 17:57:43 phk Exp $");
  
  /*
   * Timer device driver for power management events.
   * The code for suspend/resume is derived from APM device driver.
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/bus.h>
  #include <sys/kernel.h>
  #include <sys/module.h>
  #include <sys/syslog.h>
  #include <machine/clock.h>
  
  #include <isa/isavar.h>
  
  static devclass_t pmtimer_devclass;
  
  /* reject any PnP devices for now */
  static struct isa_pnp_id pmtimer_ids[] = {
  	{0}
  };
  
  static void
  pmtimer_identify(driver_t *driver, device_t parent)
  {
  	device_t child;
  
  	/*
  	 * Only add a child if one doesn't exist already.
  	 */
  	child = devclass_get_device(pmtimer_devclass, 0);
  	if (child == NULL) {
  		child = BUS_ADD_CHILD(parent, 0, "pmtimer", 0);
  		if (child == NULL)
  			panic("pmtimer_identify");
  	}
  }
  
  static int
  pmtimer_probe(device_t dev)
  {
  
  	if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
  		return (ENXIO);
  	}
  
  	/* only one instance always */
  	return (device_get_unit(dev));
  }
  
  static struct timeval suspend_time;
  static struct timeval diff_time;
  
  static int
  pmtimer_suspend(device_t dev)
  {
  	int	pl;
  
  	pl = splsoftclock();
  	microtime(&diff_time);
  	inittodr(0);
  	microtime(&suspend_time);
  	timevalsub(&diff_time, &suspend_time);
  	splx(pl);
  	return (0);
  }
  
  static int
  pmtimer_resume(device_t dev)
  {
  	int pl;
  	u_int second, minute, hour;
  	struct timeval resume_time, tmp_time;
  
  	/* modified for adjkerntz */
  	pl = splsoftclock();
  	timer_restore();		/* restore the all timers */
  	inittodr(0);			/* adjust time to RTC */
  	microtime(&resume_time);
  	getmicrotime(&tmp_time);
  	timevaladd(&tmp_time, &diff_time);
  
  #ifdef FIXME
  	/* XXX THIS DOESN'T WORK!!! */
  	time = tmp_time;
  #endif
  
  #ifdef PMTIMER_FIXUP_CALLTODO
  	/* Calculate the delta time suspended */
  	timevalsub(&resume_time, &suspend_time);
  	/* Fixup the calltodo list with the delta time. */
  	adjust_timeout_calltodo(&resume_time);
  #endif /* PMTIMER_FIXUP_CALLTODOK */
  	splx(pl);
  #ifndef PMTIMER_FIXUP_CALLTODO
  	second = resume_time.tv_sec - suspend_time.tv_sec; 
  #else /* PMTIMER_FIXUP_CALLTODO */
  	/* 
  	 * We've already calculated resume_time to be the delta between 
  	 * the suspend and the resume. 
  	 */
  	second = resume_time.tv_sec; 
  #endif /* PMTIMER_FIXUP_CALLTODO */
  	hour = second / 3600;
  	second %= 3600;
  	minute = second / 60;
  	second %= 60;
  	log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
  		hour, minute, second);
  	return (0);
  }
  
  static device_method_t pmtimer_methods[] = {
  	/* Device interface */
  	DEVMETHOD(device_identify,	pmtimer_identify),
  	DEVMETHOD(device_probe,		pmtimer_probe),
  	DEVMETHOD(device_attach,	bus_generic_attach),
  	DEVMETHOD(device_suspend,	pmtimer_suspend),
  	DEVMETHOD(device_resume,	pmtimer_resume),
  	{ 0, 0 }
  };
  
  static driver_t pmtimer_driver = {
  	"pmtimer",
  	pmtimer_methods,
  	1,		/* no softc */
  };
  
  DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);
  