pmtimer.c revision 105730 
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: head/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
43static devclass_t pmtimer_devclass;
44
45/* reject any PnP devices for now */
46static struct isa_pnp_id pmtimer_ids[] = {
47	{0}
48};
49
50static void
51pmtimer_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
66static int
67pmtimer_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
78static struct timeval suspend_time;
79static struct timeval diff_time;
80
81static int
82pmtimer_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
95static int
96pmtimer_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
140static 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
150static driver_t pmtimer_driver = {
151	"pmtimer",
152	pmtimer_methods,
153	1,		/* no softc */
154};
155
156DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);
157