pmtimer.c revision 115703 
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 115703 2003-06-02 16:32:55Z obrien $");
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/syslog.h>
40#include <machine/clock.h>
41
42#include <isa/isavar.h>
43
44static devclass_t pmtimer_devclass;
45
46/* reject any PnP devices for now */
47static struct isa_pnp_id pmtimer_ids[] = {
48	{0}
49};
50
51static void
52pmtimer_identify(driver_t *driver, device_t parent)
53{
54	device_t child;
55
56	/*
57	 * Only add a child if one doesn't exist already.
58	 */
59	child = devclass_get_device(pmtimer_devclass, 0);
60	if (child == NULL) {
61		child = BUS_ADD_CHILD(parent, 0, "pmtimer", 0);
62		if (child == NULL)
63			panic("pmtimer_identify");
64	}
65}
66
67static int
68pmtimer_probe(device_t dev)
69{
70
71	if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
72		return (ENXIO);
73	}
74
75	/* only one instance always */
76	return (device_get_unit(dev));
77}
78
79static struct timeval suspend_time;
80static struct timeval diff_time;
81
82static int
83pmtimer_suspend(device_t dev)
84{
85	int	pl;
86
87	pl = splsoftclock();
88	microtime(&diff_time);
89	inittodr(0);
90	microtime(&suspend_time);
91	timevalsub(&diff_time, &suspend_time);
92	splx(pl);
93	return (0);
94}
95
96static int
97pmtimer_resume(device_t dev)
98{
99	int pl;
100	u_int second, minute, hour;
101	struct timeval resume_time, tmp_time;
102
103	/* modified for adjkerntz */
104	pl = splsoftclock();
105	timer_restore();		/* restore the all timers */
106	inittodr(0);			/* adjust time to RTC */
107	microtime(&resume_time);
108	getmicrotime(&tmp_time);
109	timevaladd(&tmp_time, &diff_time);
110
111#ifdef FIXME
112	/* XXX THIS DOESN'T WORK!!! */
113	time = tmp_time;
114#endif
115
116#ifdef PMTIMER_FIXUP_CALLTODO
117	/* Calculate the delta time suspended */
118	timevalsub(&resume_time, &suspend_time);
119	/* Fixup the calltodo list with the delta time. */
120	adjust_timeout_calltodo(&resume_time);
121#endif /* PMTIMER_FIXUP_CALLTODOK */
122	splx(pl);
123#ifndef PMTIMER_FIXUP_CALLTODO
124	second = resume_time.tv_sec - suspend_time.tv_sec;
125#else /* PMTIMER_FIXUP_CALLTODO */
126	/*
127	 * We've already calculated resume_time to be the delta between
128	 * the suspend and the resume.
129	 */
130	second = resume_time.tv_sec;
131#endif /* PMTIMER_FIXUP_CALLTODO */
132	hour = second / 3600;
133	second %= 3600;
134	minute = second / 60;
135	second %= 60;
136	log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
137		hour, minute, second);
138	return (0);
139}
140
141static device_method_t pmtimer_methods[] = {
142	/* Device interface */
143	DEVMETHOD(device_identify,	pmtimer_identify),
144	DEVMETHOD(device_probe,		pmtimer_probe),
145	DEVMETHOD(device_attach,	bus_generic_attach),
146	DEVMETHOD(device_suspend,	pmtimer_suspend),
147	DEVMETHOD(device_resume,	pmtimer_resume),
148	{ 0, 0 }
149};
150
151static driver_t pmtimer_driver = {
152	"pmtimer",
153	pmtimer_methods,
154	1,		/* no softc */
155};
156
157DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);
158