FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/pmtimer.c
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: releng/5.0/sys/i386/isa/pmtimer.c 105730 2002-10-22 17:30:52Z jhb $
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 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 void
51 pmtimer_identify(driver_t *driver, device_t parent)
52 {
53 device_t child;
54
55 /*
56 * Only add a child if one doesn't exist already.
57 */
58 child = devclass_get_device(pmtimer_devclass, 0);
59 if (child == NULL) {
60 child = BUS_ADD_CHILD(parent, 0, "pmtimer", 0);
61 if (child == NULL)
62 panic("pmtimer_identify");
63 }
64 }
65
66 static int
67 pmtimer_probe(device_t dev)
68 {
69
70 if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
71 return (ENXIO);
72 }
73
74 /* only one instance always */
75 return (device_get_unit(dev));
76 }
77
78 static struct timeval suspend_time;
79 static struct timeval diff_time;
80
81 static int
82 pmtimer_suspend(device_t dev)
83 {
84 int pl;
85
86 pl = splsoftclock();
87 microtime(&diff_time);
88 inittodr(0);
89 microtime(&suspend_time);
90 timevalsub(&diff_time, &suspend_time);
91 splx(pl);
92 return (0);
93 }
94
95 static int
96 pmtimer_resume(device_t dev)
97 {
98 int pl;
99 u_int second, minute, hour;
100 struct timeval resume_time, tmp_time;
101
102 /* modified for adjkerntz */
103 pl = splsoftclock();
104 timer_restore(); /* restore the all timers */
105 inittodr(0); /* adjust time to RTC */
106 microtime(&resume_time);
107 getmicrotime(&tmp_time);
108 timevaladd(&tmp_time, &diff_time);
109
110 #ifdef FIXME
111 /* XXX THIS DOESN'T WORK!!! */
112 time = tmp_time;
113 #endif
114
115 #ifdef PMTIMER_FIXUP_CALLTODO
116 /* Calculate the delta time suspended */
117 timevalsub(&resume_time, &suspend_time);
118 /* Fixup the calltodo list with the delta time. */
119 adjust_timeout_calltodo(&resume_time);
120 #endif /* PMTIMER_FIXUP_CALLTODOK */
121 splx(pl);
122 #ifndef PMTIMER_FIXUP_CALLTODO
123 second = resume_time.tv_sec - suspend_time.tv_sec;
124 #else /* PMTIMER_FIXUP_CALLTODO */
125 /*
126 * We've already calculated resume_time to be the delta between
127 * the suspend and the resume.
128 */
129 second = resume_time.tv_sec;
130 #endif /* PMTIMER_FIXUP_CALLTODO */
131 hour = second / 3600;
132 second %= 3600;
133 minute = second / 60;
134 second %= 60;
135 log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
136 hour, minute, second);
137 return (0);
138 }
139
140 static device_method_t pmtimer_methods[] = {
141 /* Device interface */
142 DEVMETHOD(device_identify, pmtimer_identify),
143 DEVMETHOD(device_probe, pmtimer_probe),
144 DEVMETHOD(device_attach, bus_generic_attach),
145 DEVMETHOD(device_suspend, pmtimer_suspend),
146 DEVMETHOD(device_resume, pmtimer_resume),
147 { 0, 0 }
148 };
149
150 static driver_t pmtimer_driver = {
151 "pmtimer",
152 pmtimer_methods,
153 1, /* no softc */
154 };
155
156 DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);
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