The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 /*
   31  * Timer device driver for power management events.
   32  * The code for suspend/resume is derived from APM device driver.
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/clock.h>
   39 #include <sys/kernel.h>
   40 #include <sys/module.h>
   41 #include <sys/syslog.h>
   42 #include <machine/clock.h>
   43 
   44 #include <isa/isavar.h>
   45 
   46 static devclass_t pmtimer_devclass;
   47 
   48 /* reject any PnP devices for now */
   49 static struct isa_pnp_id pmtimer_ids[] = {
   50         {0}
   51 };
   52 
   53 static void
   54 pmtimer_identify(driver_t *driver, device_t parent)
   55 {
   56         device_t child;
   57 
   58         /*
   59          * Only add a child if one doesn't exist already.
   60          */
   61         child = devclass_get_device(pmtimer_devclass, 0);
   62         if (child == NULL) {
   63                 child = BUS_ADD_CHILD(parent, 0, "pmtimer", 0);
   64                 if (child == NULL)
   65                         panic("pmtimer_identify");
   66         }
   67 }
   68 
   69 static int
   70 pmtimer_probe(device_t dev)
   71 {
   72 
   73         if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
   74                 return (ENXIO);
   75         }
   76 
   77         /* only one instance always */
   78         return (device_get_unit(dev));
   79 }
   80 
   81 static struct timeval suspend_time;
   82 static struct timeval diff_time;
   83 
   84 static int
   85 pmtimer_suspend(device_t dev)
   86 {
   87         int     pl;
   88 
   89         pl = splsoftclock();
   90         microtime(&diff_time);
   91         inittodr(0);
   92         microtime(&suspend_time);
   93         timevalsub(&diff_time, &suspend_time);
   94         splx(pl);
   95         return (0);
   96 }
   97 
   98 static int
   99 pmtimer_resume(device_t dev)
  100 {
  101         int pl;
  102         u_int second, minute, hour;
  103         struct timeval resume_time, tmp_time;
  104 
  105         /* modified for adjkerntz */
  106         pl = splsoftclock();
  107         timer_restore();                /* restore the all timers */
  108         inittodr(0);                    /* adjust time to RTC */
  109         microtime(&resume_time);
  110         getmicrotime(&tmp_time);
  111         timevaladd(&tmp_time, &diff_time);
  112 
  113 #ifdef FIXME
  114         /* XXX THIS DOESN'T WORK!!! */
  115         time = tmp_time;
  116 #endif
  117 
  118 #ifdef PMTIMER_FIXUP_CALLTODO
  119         /* Calculate the delta time suspended */
  120         timevalsub(&resume_time, &suspend_time);
  121         /* Fixup the calltodo list with the delta time. */
  122         adjust_timeout_calltodo(&resume_time);
  123 #endif /* PMTIMER_FIXUP_CALLTODOK */
  124         splx(pl);
  125 #ifndef PMTIMER_FIXUP_CALLTODO
  126         second = resume_time.tv_sec - suspend_time.tv_sec; 
  127 #else /* PMTIMER_FIXUP_CALLTODO */
  128         /* 
  129          * We've already calculated resume_time to be the delta between 
  130          * the suspend and the resume. 
  131          */
  132         second = resume_time.tv_sec; 
  133 #endif /* PMTIMER_FIXUP_CALLTODO */
  134         hour = second / 3600;
  135         second %= 3600;
  136         minute = second / 60;
  137         second %= 60;
  138         log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
  139                 hour, minute, second);
  140         return (0);
  141 }
  142 
  143 static device_method_t pmtimer_methods[] = {
  144         /* Device interface */
  145         DEVMETHOD(device_identify,      pmtimer_identify),
  146         DEVMETHOD(device_probe,         pmtimer_probe),
  147         DEVMETHOD(device_attach,        bus_generic_attach),
  148         DEVMETHOD(device_suspend,       pmtimer_suspend),
  149         DEVMETHOD(device_resume,        pmtimer_resume),
  150         { 0, 0 }
  151 };
  152 
  153 static driver_t pmtimer_driver = {
  154         "pmtimer",
  155         pmtimer_methods,
  156         1,              /* no softc */
  157 };
  158 
  159 DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);

Cache object: 954cabcd6cc7e16327a18c4e903a598f


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