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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/7.3/sys/i386/isa/pmtimer.c 162954 2006-10-02 12:59:59Z 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/clock.h>
39 #include <sys/kernel.h>
40 #include <sys/module.h>
41 #include <sys/syslog.h>
42 #include <machine/clock.h>
43
44 #include <isa/isavar.h>
45
46 static devclass_t pmtimer_devclass;
47
48 /* reject any PnP devices for now */
49 static struct isa_pnp_id pmtimer_ids[] = {
50 {0}
51 };
52
53 static void
54 pmtimer_identify(driver_t *driver, device_t parent)
55 {
56 device_t child;
57
58 /*
59 * Only add a child if one doesn't exist already.
60 */
61 child = devclass_get_device(pmtimer_devclass, 0);
62 if (child == NULL) {
63 child = BUS_ADD_CHILD(parent, 0, "pmtimer", 0);
64 if (child == NULL)
65 panic("pmtimer_identify");
66 }
67 }
68
69 static int
70 pmtimer_probe(device_t dev)
71 {
72
73 if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
74 return (ENXIO);
75 }
76
77 /* only one instance always */
78 return (device_get_unit(dev));
79 }
80
81 static struct timeval suspend_time;
82 static struct timeval diff_time;
83
84 static int
85 pmtimer_suspend(device_t dev)
86 {
87 int pl;
88
89 pl = splsoftclock();
90 microtime(&diff_time);
91 inittodr(0);
92 microtime(&suspend_time);
93 timevalsub(&diff_time, &suspend_time);
94 splx(pl);
95 return (0);
96 }
97
98 static int
99 pmtimer_resume(device_t dev)
100 {
101 int pl;
102 u_int second, minute, hour;
103 struct timeval resume_time, tmp_time;
104
105 /* modified for adjkerntz */
106 pl = splsoftclock();
107 timer_restore(); /* restore the all timers */
108 inittodr(0); /* adjust time to RTC */
109 microtime(&resume_time);
110 getmicrotime(&tmp_time);
111 timevaladd(&tmp_time, &diff_time);
112
113 #ifdef FIXME
114 /* XXX THIS DOESN'T WORK!!! */
115 time = tmp_time;
116 #endif
117
118 #ifdef PMTIMER_FIXUP_CALLTODO
119 /* Calculate the delta time suspended */
120 timevalsub(&resume_time, &suspend_time);
121 /* Fixup the calltodo list with the delta time. */
122 adjust_timeout_calltodo(&resume_time);
123 #endif /* PMTIMER_FIXUP_CALLTODOK */
124 splx(pl);
125 #ifndef PMTIMER_FIXUP_CALLTODO
126 second = resume_time.tv_sec - suspend_time.tv_sec;
127 #else /* PMTIMER_FIXUP_CALLTODO */
128 /*
129 * We've already calculated resume_time to be the delta between
130 * the suspend and the resume.
131 */
132 second = resume_time.tv_sec;
133 #endif /* PMTIMER_FIXUP_CALLTODO */
134 hour = second / 3600;
135 second %= 3600;
136 minute = second / 60;
137 second %= 60;
138 log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
139 hour, minute, second);
140 return (0);
141 }
142
143 static device_method_t pmtimer_methods[] = {
144 /* Device interface */
145 DEVMETHOD(device_identify, pmtimer_identify),
146 DEVMETHOD(device_probe, pmtimer_probe),
147 DEVMETHOD(device_attach, bus_generic_attach),
148 DEVMETHOD(device_suspend, pmtimer_suspend),
149 DEVMETHOD(device_resume, pmtimer_resume),
150 { 0, 0 }
151 };
152
153 static driver_t pmtimer_driver = {
154 "pmtimer",
155 pmtimer_methods,
156 1, /* no softc */
157 };
158
159 DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);
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