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