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: releng/5.3/sys/i386/isa/pmtimer.c 129876 2004-05-30 17:57:46Z phk $");
   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/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/syslog.h>
   41 #include <machine/clock.h>
   42 
   43 #include <isa/isavar.h>
   44 
   45 static devclass_t pmtimer_devclass;
   46 
   47 /* reject any PnP devices for now */
   48 static struct isa_pnp_id pmtimer_ids[] = {
   49         {0}
   50 };
   51 
   52 static void
   53 pmtimer_identify(driver_t *driver, device_t parent)
   54 {
   55         device_t child;
   56 
   57         /*
   58          * Only add a child if one doesn't exist already.
   59          */
   60         child = devclass_get_device(pmtimer_devclass, 0);
   61         if (child == NULL) {
   62                 child = BUS_ADD_CHILD(parent, 0, "pmtimer", 0);
   63                 if (child == NULL)
   64                         panic("pmtimer_identify");
   65         }
   66 }
   67 
   68 static int
   69 pmtimer_probe(device_t dev)
   70 {
   71 
   72         if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
   73                 return (ENXIO);
   74         }
   75 
   76         /* only one instance always */
   77         return (device_get_unit(dev));
   78 }
   79 
   80 static struct timeval suspend_time;
   81 static struct timeval diff_time;
   82 
   83 static int
   84 pmtimer_suspend(device_t dev)
   85 {
   86         int     pl;
   87 
   88         pl = splsoftclock();
   89         microtime(&diff_time);
   90         inittodr(0);
   91         microtime(&suspend_time);
   92         timevalsub(&diff_time, &suspend_time);
   93         splx(pl);
   94         return (0);
   95 }
   96 
   97 static int
   98 pmtimer_resume(device_t dev)
   99 {
  100         int pl;
  101         u_int second, minute, hour;
  102         struct timeval resume_time, tmp_time;
  103 
  104         /* modified for adjkerntz */
  105         pl = splsoftclock();
  106         timer_restore();                /* restore the all timers */
  107         inittodr(0);                    /* adjust time to RTC */
  108         microtime(&resume_time);
  109         getmicrotime(&tmp_time);
  110         timevaladd(&tmp_time, &diff_time);
  111 
  112 #ifdef FIXME
  113         /* XXX THIS DOESN'T WORK!!! */
  114         time = tmp_time;
  115 #endif
  116 
  117 #ifdef PMTIMER_FIXUP_CALLTODO
  118         /* Calculate the delta time suspended */
  119         timevalsub(&resume_time, &suspend_time);
  120         /* Fixup the calltodo list with the delta time. */
  121         adjust_timeout_calltodo(&resume_time);
  122 #endif /* PMTIMER_FIXUP_CALLTODOK */
  123         splx(pl);
  124 #ifndef PMTIMER_FIXUP_CALLTODO
  125         second = resume_time.tv_sec - suspend_time.tv_sec; 
  126 #else /* PMTIMER_FIXUP_CALLTODO */
  127         /* 
  128          * We've already calculated resume_time to be the delta between 
  129          * the suspend and the resume. 
  130          */
  131         second = resume_time.tv_sec; 
  132 #endif /* PMTIMER_FIXUP_CALLTODO */
  133         hour = second / 3600;
  134         second %= 3600;
  135         minute = second / 60;
  136         second %= 60;
  137         log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
  138                 hour, minute, second);
  139         return (0);
  140 }
  141 
  142 static device_method_t pmtimer_methods[] = {
  143         /* Device interface */
  144         DEVMETHOD(device_identify,      pmtimer_identify),
  145         DEVMETHOD(device_probe,         pmtimer_probe),
  146         DEVMETHOD(device_attach,        bus_generic_attach),
  147         DEVMETHOD(device_suspend,       pmtimer_suspend),
  148         DEVMETHOD(device_resume,        pmtimer_resume),
  149         { 0, 0 }
  150 };
  151 
  152 static driver_t pmtimer_driver = {
  153         "pmtimer",
  154         pmtimer_methods,
  155         1,              /* no softc */
  156 };
  157 
  158 DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);

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