pmtimer.c revision 129876
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: head/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 45static devclass_t pmtimer_devclass; 46 47/* reject any PnP devices for now */ 48static struct isa_pnp_id pmtimer_ids[] = { 49 {0} 50}; 51 52static void 53pmtimer_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 68static int 69pmtimer_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 80static struct timeval suspend_time; 81static struct timeval diff_time; 82 83static int 84pmtimer_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 97static int 98pmtimer_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 142static 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 152static driver_t pmtimer_driver = { 153 "pmtimer", 154 pmtimer_methods, 155 1, /* no softc */ 156}; 157 158DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0); 159