pmtimer.c revision 65865
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 * $FreeBSD: head/sys/i386/isa/pmtimer.c 65865 2000-09-14 22:34:57Z iwasaki $ 27 */ 28 29/* 30 * Timer device driver for power management events. 31 * The code for suspend/resume is derived from APM device driver. 32 */ 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/bus.h> 37#include <sys/kernel.h> 38#include <sys/syslog.h> 39#include <machine/clock.h> 40 41#include <isa/isavar.h> 42 43/* reject any PnP devices for now */ 44static struct isa_pnp_id pmtimer_ids[] = { 45 {0} 46}; 47 48static int 49pmtimer_probe(device_t dev) 50{ 51 52 if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) { 53 return (ENXIO); 54 } 55 56 /* only one instance always */ 57 return (device_get_unit(dev)); 58} 59 60static struct timeval suspend_time; 61static struct timeval diff_time; 62 63static int 64pmtimer_suspend(device_t dev) 65{ 66 int pl; 67 68 pl = splsoftclock(); 69 microtime(&diff_time); 70 inittodr(0); 71 microtime(&suspend_time); 72 timevalsub(&diff_time, &suspend_time); 73 splx(pl); 74 return (0); 75} 76 77static int 78pmtimer_resume(device_t dev) 79{ 80 int pl; 81 u_int second, minute, hour; 82 struct timeval resume_time, tmp_time; 83 84 /* modified for adjkerntz */ 85 pl = splsoftclock(); 86 i8254_restore(); /* restore timer_freq and hz */ 87 inittodr(0); /* adjust time to RTC */ 88 microtime(&resume_time); 89 getmicrotime(&tmp_time); 90 timevaladd(&tmp_time, &diff_time); 91 92#ifdef FIXME 93 /* XXX THIS DOESN'T WORK!!! */ 94 time = tmp_time; 95#endif 96 97#ifdef PMTIMER_FIXUP_CALLTODO 98 /* Calculate the delta time suspended */ 99 timevalsub(&resume_time, &suspend_time); 100 /* Fixup the calltodo list with the delta time. */ 101 adjust_timeout_calltodo(&resume_time); 102#endif /* PMTIMER_FIXUP_CALLTODOK */ 103 splx(pl); 104#ifndef PMTIMER_FIXUP_CALLTODO 105 second = resume_time.tv_sec - suspend_time.tv_sec; 106#else /* PMTIMER_FIXUP_CALLTODO */ 107 /* 108 * We've already calculated resume_time to be the delta between 109 * the suspend and the resume. 110 */ 111 second = resume_time.tv_sec; 112#endif /* PMTIMER_FIXUP_CALLTODO */ 113 hour = second / 3600; 114 second %= 3600; 115 minute = second / 60; 116 second %= 60; 117 log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n", 118 hour, minute, second); 119 return (0); 120} 121 122static device_method_t pmtimer_methods[] = { 123 /* Device interface */ 124 DEVMETHOD(device_probe, pmtimer_probe), 125 DEVMETHOD(device_attach, bus_generic_attach), 126 DEVMETHOD(device_suspend, pmtimer_suspend), 127 DEVMETHOD(device_resume, pmtimer_resume), 128 { 0, 0 } 129}; 130 131static driver_t pmtimer_driver = { 132 "pmtimer", 133 pmtimer_methods, 134 1, /* no softc */ 135}; 136 137static devclass_t pmtimer_devclass; 138 139DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0); 140