FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/pmtimer.c

     /*-
      * 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: releng/6.2/sys/i386/isa/pmtimer.c 129876 2004-05-30 17:57:46Z phk $");
    
    /*
     * 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);

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