pmtimer.c revision 256281
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: stable/10/sys/i386/isa/pmtimer.c 247088 2013-02-21 07:16:40Z imp $"); 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 /* only one instance always */ 76 return (device_get_unit(dev)); 77} 78 79static struct timeval suspend_time; 80static struct timeval diff_time; 81 82static int 83pmtimer_suspend(device_t dev) 84{ 85 86 microtime(&diff_time); 87 inittodr(0); 88 microtime(&suspend_time); 89 timevalsub(&diff_time, &suspend_time); 90 return (0); 91} 92 93static int 94pmtimer_resume(device_t dev) 95{ 96 u_int second, minute, hour; 97 struct timeval resume_time, tmp_time; 98 99 /* modified for adjkerntz */ 100 timer_restore(); /* restore the all timers */ 101 inittodr(0); /* adjust time to RTC */ 102 microtime(&resume_time); 103 getmicrotime(&tmp_time); 104 timevaladd(&tmp_time, &diff_time); 105 106#ifdef FIXME 107 /* XXX THIS DOESN'T WORK!!! */ 108 time = tmp_time; 109#endif 110 111#ifdef PMTIMER_FIXUP_CALLTODO 112 /* Calculate the delta time suspended */ 113 timevalsub(&resume_time, &suspend_time); 114 /* Fixup the calltodo list with the delta time. */ 115 adjust_timeout_calltodo(&resume_time); 116 /* 117 * We've already calculated resume_time to be the delta between 118 * the suspend and the resume. 119 */ 120 second = resume_time.tv_sec; 121#else /* !PMTIMER_FIXUP_CALLTODO */ 122 second = resume_time.tv_sec - suspend_time.tv_sec; 123#endif /* PMTIMER_FIXUP_CALLTODO */ 124 hour = second / 3600; 125 second %= 3600; 126 minute = second / 60; 127 second %= 60; 128 log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n", 129 hour, minute, second); 130 return (0); 131} 132 133static device_method_t pmtimer_methods[] = { 134 /* Device interface */ 135 DEVMETHOD(device_identify, pmtimer_identify), 136 DEVMETHOD(device_probe, pmtimer_probe), 137 DEVMETHOD(device_attach, bus_generic_attach), 138 DEVMETHOD(device_suspend, pmtimer_suspend), 139 DEVMETHOD(device_resume, pmtimer_resume), 140 { 0, 0 } 141}; 142 143static driver_t pmtimer_driver = { 144 "pmtimer", 145 pmtimer_methods, 146 1, /* no softc */ 147}; 148 149DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0); 150