1 /*- 2 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org> 3 * Copyright (c) 2008 The DragonFly Project. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * Timer device driver for power management events. 30 * The code for suspend/resume is derived from APM device driver. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/syslog.h> 38 #include <sys/thread2.h> 39 #include <machine/clock.h> 40 41 #include <bus/isa/isavar.h> 42 43 static devclass_t pmtimer_devclass; 44 45 /* reject any PnP devices for now */ 46 static struct isa_pnp_id pmtimer_ids[] = { 47 {0} 48 }; 49 50 static int 51 pmtimer_probe(device_t dev) 52 { 53 54 if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) { 55 return (ENXIO); 56 } 57 58 /* only one instance always */ 59 return (device_get_unit(dev)); 60 } 61 62 static struct timeval suspend_time; 63 static struct timeval diff_time; 64 65 static int 66 pmtimer_suspend(device_t dev) 67 { 68 crit_enter(); 69 microtime(&diff_time); 70 inittodr(0); 71 microtime(&suspend_time); 72 timevalsub(&diff_time, &suspend_time); 73 crit_exit(); 74 return (0); 75 } 76 77 static int 78 pmtimer_resume(device_t dev) 79 { 80 u_int second, minute, hour; 81 struct timeval resume_time; 82 83 /* modified for adjkerntz */ 84 crit_enter(); 85 timer_restore(); /* restore the all timers */ 86 inittodr(0); /* adjust time to RTC */ 87 microtime(&resume_time); 88 89 crit_exit(); 90 second = resume_time.tv_sec - suspend_time.tv_sec; 91 hour = second / 3600; 92 second %= 3600; 93 minute = second / 60; 94 second %= 60; 95 log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n", 96 hour, minute, second); 97 return (0); 98 } 99 100 /* 101 * Because pmtimer is a static device that always exists under any attached 102 * isa device, and not scanned by the isa device, we need an identify 103 * function to install the device. 104 */ 105 static device_method_t pmtimer_methods[] = { 106 /* Device interface */ 107 DEVMETHOD(device_identify, bus_generic_identify), 108 DEVMETHOD(device_probe, pmtimer_probe), 109 DEVMETHOD(device_attach, bus_generic_attach), 110 DEVMETHOD(device_suspend, pmtimer_suspend), 111 DEVMETHOD(device_resume, pmtimer_resume), 112 DEVMETHOD_END 113 }; 114 115 static driver_t pmtimer_driver = { 116 "pmtimer", 117 pmtimer_methods, 118 1, /* no softc */ 119 }; 120 121 DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, NULL, NULL); 122