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("$FreeBSD$");
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	/* 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
86	microtime(&diff_time);
87	inittodr(0);
88	microtime(&suspend_time);
89	timevalsub(&diff_time, &suspend_time);
90	return (0);
91}
92
93static int
94pmtimer_resume(device_t dev)
95{
96	u_int second, minute, hour;
97	struct timeval resume_time, tmp_time;
98
99	/* modified for adjkerntz */
100	timer_restore();		/* restore the all timers */
101	inittodr(0);			/* adjust time to RTC */
102	microtime(&resume_time);
103	getmicrotime(&tmp_time);
104	timevaladd(&tmp_time, &diff_time);
105
106#ifdef FIXME
107	/* XXX THIS DOESN'T WORK!!! */
108	time = tmp_time;
109#endif
110
111#ifdef PMTIMER_FIXUP_CALLTODO
112	/* Calculate the delta time suspended */
113	timevalsub(&resume_time, &suspend_time);
114	/* Fixup the calltodo list with the delta time. */
115	adjust_timeout_calltodo(&resume_time);
116	/*
117	 * We've already calculated resume_time to be the delta between
118	 * the suspend and the resume.
119	 */
120	second = resume_time.tv_sec;
121#else /* !PMTIMER_FIXUP_CALLTODO */
122	second = resume_time.tv_sec - suspend_time.tv_sec;
123#endif /* PMTIMER_FIXUP_CALLTODO */
124	hour = second / 3600;
125	second %= 3600;
126	minute = second / 60;
127	second %= 60;
128	log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
129		hour, minute, second);
130	return (0);
131}
132
133static device_method_t pmtimer_methods[] = {
134	/* Device interface */
135	DEVMETHOD(device_identify,	pmtimer_identify),
136	DEVMETHOD(device_probe,		pmtimer_probe),
137	DEVMETHOD(device_attach,	bus_generic_attach),
138	DEVMETHOD(device_suspend,	pmtimer_suspend),
139	DEVMETHOD(device_resume,	pmtimer_resume),
140	{ 0, 0 }
141};
142
143static driver_t pmtimer_driver = {
144	"pmtimer",
145	pmtimer_methods,
146	1,		/* no softc */
147};
148
149DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);
150