apm.c revision 33181 
1/*
2 * APM (Advanced Power Management) BIOS Device Driver
3 *
4 * Copyright (c) 1994 UKAI, Fumitoshi.
5 * Copyright (c) 1994-1995 by HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
6 * Copyright (c) 1996 Nate Williams <nate@FreeBSD.org>
7 * Copyright (c) 1997 Poul-Henning Kamp <phk@FreeBSD.org>
8 *
9 * This software may be used, modified, copied, and distributed, in
10 * both source and binary form provided that the above copyright and
11 * these terms are retained. Under no circumstances is the author
12 * responsible for the proper functioning of this software, nor does
13 * the author assume any responsibility for damages incurred with its
14 * use.
15 *
16 * Sep, 1994	Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
17 *
18 *	$Id: apm.c,v 1.68 1998/01/24 02:54:08 eivind Exp $
19 */
20
21#include "opt_devfs.h"
22
23#include <sys/param.h>
24#include <sys/conf.h>
25#include <sys/kernel.h>
26#ifdef DEVFS
27#include <sys/devfsext.h>
28#endif /*DEVFS*/
29#include <sys/systm.h>
30#include <sys/time.h>
31#include <i386/isa/isa_device.h>
32#include <machine/apm_bios.h>
33#include <machine/segments.h>
34#include <machine/clock.h>
35#include <vm/vm.h>
36#include <vm/vm_param.h>
37#include <vm/pmap.h>
38#include <sys/syslog.h>
39#include <i386/apm/apm_setup.h>
40
41static int apm_display __P((int newstate));
42static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx, u_long *edx));
43static void apm_resume __P((void));
44
45/* static data */
46struct apm_softc {
47	int	initialized, active;
48	int	always_halt_cpu, slow_idle_cpu;
49	int	disabled, disengaged;
50	u_int	minorversion, majorversion;
51	u_int	cs32_base, cs16_base, ds_base;
52	u_int	cs_limit, ds_limit;
53	u_int	cs_entry;
54	u_int	intversion;
55	struct apmhook sc_suspend;
56	struct apmhook sc_resume;
57#ifdef DEVFS
58	void 	*sc_devfs_token;
59#endif
60};
61
62static struct apm_softc apm_softc;
63static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
64
65#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
66
67/* Map version number to integer (keeps ordering of version numbers) */
68#define INTVERSION(major, minor)	((major)*100 + (minor))
69
70static struct callout_handle apm_timeout_ch =
71    CALLOUT_HANDLE_INITIALIZER(&apm_timeout_ch);
72
73static timeout_t apm_timeout;
74static d_open_t apmopen;
75static d_close_t apmclose;
76static d_ioctl_t apmioctl;
77
78#define CDEV_MAJOR 39
79static struct cdevsw apm_cdevsw =
80	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
81	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
82	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
83
84/* setup APM GDT discriptors */
85static void
86setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
87{
88	/* setup 32bit code segment */
89	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
90	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
91
92	/* setup 16bit code segment */
93	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
94	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
95
96	/* setup data segment */
97	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
98	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
99
100	/* reflect these changes on physical GDT */
101	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
102	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
103	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
104}
105
106/* 48bit far pointer. Do not staticize - used from apm_setup.s */
107struct addr48 {
108	u_long		offset;
109	u_short		segment;
110} apm_addr;
111
112static int apm_errno;
113
114static int
115apm_int(u_long *eax, u_long *ebx, u_long *ecx, u_long *edx)
116{
117	struct apm_bios_arg apa;
118	int cf;
119
120	apa.eax = *eax;
121	apa.ebx = *ebx;
122	apa.ecx = *ecx;
123	apa.edx = *edx;
124	cf = apm_bios_call(&apa);
125	*eax = apa.eax;
126	*ebx = apa.ebx;
127	*ecx = apa.ecx;
128	*edx = apa.edx;
129	apm_errno = ((*eax) >> 8) & 0xff;
130	return cf;
131}
132
133
134/* enable/disable power management */
135static int
136apm_enable_disable_pm(int enable)
137{
138	struct apm_softc *sc = &apm_softc;
139
140	u_long eax, ebx, ecx, edx;
141
142	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
143
144	if (sc->intversion >= INTVERSION(1, 1))
145		ebx  = PMDV_ALLDEV;
146	else
147		ebx  = 0xffff;	/* APM version 1.0 only */
148	ecx  = enable;
149	edx = 0;
150	return apm_int(&eax, &ebx, &ecx, &edx);
151}
152
153static void
154apm_driver_version(int version)
155{
156	u_long eax, ebx, ecx, edx;
157
158	/* First try APM 1.2 */
159	eax = (APM_BIOS << 8) | APM_DRVVERSION;
160	ebx  = 0x0;
161	ecx  = version;
162	edx = 0;
163	if(!apm_int(&eax, &ebx, &ecx, &edx))
164		apm_version = eax & 0xffff;
165}
166
167/* engage/disengage power management (APM 1.1 or later) */
168static int
169apm_engage_disengage_pm(int engage)
170{
171	u_long eax, ebx, ecx, edx;
172
173	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
174	ebx = PMDV_ALLDEV;
175	ecx = engage;
176	edx = 0;
177	return(apm_int(&eax, &ebx, &ecx, &edx));
178}
179
180/* get PM event */
181static u_int
182apm_getevent(void)
183{
184	u_long eax, ebx, ecx, edx;
185
186	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
187
188	ebx = 0;
189	ecx = 0;
190	edx = 0;
191	if (apm_int(&eax, &ebx, &ecx, &edx))
192		return PMEV_NOEVENT;
193
194	return ebx & 0xffff;
195}
196
197/* suspend entire system */
198static int
199apm_suspend_system(void)
200{
201	u_long eax, ebx, ecx, edx;
202
203	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
204	ebx = PMDV_ALLDEV;
205	ecx = PMST_SUSPEND;
206	edx = 0;
207
208	if (apm_int(&eax, &ebx, &ecx, &edx)) {
209		printf("Entire system suspend failure: errcode = %ld\n",
210			0xff & (eax >> 8));
211		return 1;
212	}
213	return 0;
214}
215
216/* Display control */
217/*
218 * Experimental implementation: My laptop machine can't handle this function
219 * If your laptop can control the display via APM, please inform me.
220 *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
221 */
222static int
223apm_display(int newstate)
224{
225	u_long eax, ebx, ecx, edx;
226
227	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
228	ebx = PMDV_DISP0;
229	ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
230	edx = 0;
231	if (apm_int(&eax, &ebx, &ecx, &edx)) {
232		printf("Display off failure: errcode = %ld\n",
233			0xff & (eax >> 8));
234		return 1;
235	}
236	return 0;
237}
238
239/*
240 * Turn off the entire system.
241 */
242void
243apm_power_off(void)
244{
245	u_long eax, ebx, ecx, edx;
246
247	if (!apm_softc.active)
248		return;
249	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
250	ebx = PMDV_ALLDEV;
251	ecx = PMST_OFF;
252	edx = 0;
253	apm_int(&eax, &ebx, &ecx, &edx);
254}
255
256/* APM Battery low handler */
257static void
258apm_battery_low(void)
259{
260	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
261}
262
263/* APM hook manager */
264static struct apmhook *
265apm_add_hook(struct apmhook **list, struct apmhook *ah)
266{
267	int s;
268	struct apmhook *p, *prev;
269
270#ifdef APM_DEBUG
271	printf("Add hook \"%s\"\n", ah->ah_name);
272#endif
273
274	s = splhigh();
275	if (ah == NULL)
276		panic("illegal apm_hook!");
277	prev = NULL;
278	for (p = *list; p != NULL; prev = p, p = p->ah_next)
279		if (p->ah_order > ah->ah_order)
280			break;
281
282	if (prev == NULL) {
283		ah->ah_next = *list;
284		*list = ah;
285	} else {
286		ah->ah_next = prev->ah_next;
287		prev->ah_next = ah;
288	}
289	splx(s);
290	return ah;
291}
292
293static void
294apm_del_hook(struct apmhook **list, struct apmhook *ah)
295{
296	int s;
297	struct apmhook *p, *prev;
298
299	s = splhigh();
300	prev = NULL;
301	for (p = *list; p != NULL; prev = p, p = p->ah_next)
302		if (p == ah)
303			goto deleteit;
304	panic("Tried to delete unregistered apm_hook.");
305	goto nosuchnode;
306deleteit:
307	if (prev != NULL)
308		prev->ah_next = p->ah_next;
309	else
310		*list = p->ah_next;
311nosuchnode:
312	splx(s);
313}
314
315
316/* APM driver calls some functions automatically */
317static void
318apm_execute_hook(struct apmhook *list)
319{
320	struct apmhook *p;
321
322	for (p = list; p != NULL; p = p->ah_next) {
323#ifdef APM_DEBUG
324		printf("Execute APM hook \"%s.\"\n", p->ah_name);
325#endif
326		if ((*(p->ah_fun))(p->ah_arg))
327			printf("Warning: APM hook \"%s\" failed", p->ah_name);
328	}
329}
330
331
332/* establish an apm hook */
333struct apmhook *
334apm_hook_establish(int apmh, struct apmhook *ah)
335{
336	if (apmh < 0 || apmh >= NAPM_HOOK)
337		return NULL;
338
339	return apm_add_hook(&hook[apmh], ah);
340}
341
342/* disestablish an apm hook */
343void
344apm_hook_disestablish(int apmh, struct apmhook *ah)
345{
346	if (apmh < 0 || apmh >= NAPM_HOOK)
347		return;
348
349	apm_del_hook(&hook[apmh], ah);
350}
351
352
353static struct timeval suspend_time;
354static struct timeval diff_time;
355
356static int
357apm_default_resume(void *arg)
358{
359	int pl;
360	u_int second, minute, hour;
361	struct timeval resume_time, tmp_time;
362
363	/* modified for adjkerntz */
364	pl = splsoftclock();
365	inittodr(0);			/* adjust time to RTC */
366	microtime(&resume_time);
367	tmp_time = time;		/* because 'time' is volatile */
368	timevaladd(&tmp_time, &diff_time);
369	time = tmp_time;
370#ifdef APM_FIXUP_CALLTODO
371	/* Calculate the delta time suspended */
372	timevalsub(&resume_time, &suspend_time);
373	/* Fixup the calltodo list with the delta time. */
374	adjust_timeout_calltodo(&resume_time);
375#endif /* APM_FIXUP_CALLTODOK */
376	splx(pl);
377#ifndef APM_FIXUP_CALLTODO
378	second = resume_time.tv_sec - suspend_time.tv_sec;
379#else /* APM_FIXUP_CALLTODO */
380	/*
381	 * We've already calculated resume_time to be the delta between
382	 * the suspend and the resume.
383	 */
384	second = resume_time.tv_sec;
385#endif /* APM_FIXUP_CALLTODO */
386	hour = second / 3600;
387	second %= 3600;
388	minute = second / 60;
389	second %= 60;
390	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
391		hour, minute, second);
392	return 0;
393}
394
395static int
396apm_default_suspend(void *arg)
397{
398	int	pl;
399
400	pl = splsoftclock();
401	microtime(&diff_time);
402	inittodr(0);
403	microtime(&suspend_time);
404	timevalsub(&diff_time, &suspend_time);
405	splx(pl);
406	return 0;
407}
408
409static void apm_processevent(void);
410
411/*
412 * Public interface to the suspend/resume:
413 *
414 * Execute suspend and resume hook before and after sleep, respectively.
415 *
416 */
417
418void
419apm_suspend(void)
420{
421	struct apm_softc *sc = &apm_softc;
422
423	if (!sc)
424		return;
425
426	if (sc->initialized) {
427		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
428		if (apm_suspend_system() == 0)
429			apm_processevent();
430		else
431			/* Failure, 'resume' the system again */
432			apm_execute_hook(hook[APM_HOOK_RESUME]);
433	}
434}
435
436void
437apm_resume(void)
438{
439	struct apm_softc *sc = &apm_softc;
440
441	if (!sc)
442		return;
443
444	if (sc->initialized)
445		apm_execute_hook(hook[APM_HOOK_RESUME]);
446}
447
448
449/* get APM information */
450static int
451apm_get_info(apm_info_t aip)
452{
453	struct apm_softc *sc = &apm_softc;
454	u_long eax, ebx, ecx, edx;
455
456	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
457	ebx = PMDV_ALLDEV;
458	ecx = 0;
459	edx = 0xffff;			/* default to unknown battery time */
460
461	if (apm_int(&eax, &ebx, &ecx, &edx))
462		return 1;
463
464	aip->ai_infoversion = 0;
465	aip->ai_acline      = (ebx >> 8) & 0xff;
466	aip->ai_batt_stat   = ebx & 0xff;
467	aip->ai_batt_life   = ecx & 0xff;
468	aip->ai_major       = (u_int)sc->majorversion;
469	aip->ai_minor       = (u_int)sc->minorversion;
470	aip->ai_status      = (u_int)sc->active;
471	edx &= 0xffff;
472	if (edx == 0xffff)	/* Time is unknown */
473		aip->ai_batt_time = -1;
474	else if (edx & 0x8000)	/* Time is in minutes */
475		aip->ai_batt_time = (edx & 0x7fff) * 60;
476	else			/* Time is in seconds */
477		aip->ai_batt_time = edx;
478	bzero(aip->ai_spare, sizeof aip->ai_spare);
479
480	return 0;
481}
482
483
484/* inform APM BIOS that CPU is idle */
485void
486apm_cpu_idle(void)
487{
488	struct apm_softc *sc = &apm_softc;
489
490	if (sc->active) {
491		u_long eax, ebx, ecx, edx;
492
493		eax = (APM_BIOS <<8) | APM_CPUIDLE;
494		edx = ecx = ebx = 0;
495		apm_int(&eax, &ebx, &ecx, &edx);
496	}
497	/*
498	 * Some APM implementation halts CPU in BIOS, whenever
499	 * "CPU-idle" function are invoked, but swtch() of
500	 * FreeBSD halts CPU, therefore, CPU is halted twice
501	 * in the sched loop. It makes the interrupt latency
502	 * terribly long and be able to cause a serious problem
503	 * in interrupt processing. We prevent it by removing
504	 * "hlt" operation from swtch() and managed it under
505	 * APM driver.
506	 */
507	if (!sc->active || sc->always_halt_cpu)
508		__asm("hlt");	/* wait for interrupt */
509}
510
511/* inform APM BIOS that CPU is busy */
512void
513apm_cpu_busy(void)
514{
515	struct apm_softc *sc = &apm_softc;
516
517	/*
518	 * The APM specification says this is only necessary if your BIOS
519	 * slows down the processor in the idle task, otherwise it's not
520	 * necessary.
521	 */
522	if (sc->slow_idle_cpu && sc->active) {
523		u_long eax, ebx, ecx, edx;
524
525		eax = (APM_BIOS <<8) | APM_CPUBUSY;
526		edx = ecx = ebx = 0;
527		apm_int(&eax, &ebx, &ecx, &edx);
528	}
529}
530
531
532/*
533 * APM timeout routine:
534 *
535 * This routine is automatically called by timer once per second.
536 */
537
538static void
539apm_timeout(void *dummy)
540{
541	struct apm_softc *sc = &apm_softc;
542
543	apm_processevent();
544	if (sc->active == 1)
545		/* Run slightly more oftan than 1 Hz */
546		apm_timeout_ch = timeout(apm_timeout, NULL, hz - 1 );
547}
548
549/* enable APM BIOS */
550static void
551apm_event_enable(void)
552{
553	struct apm_softc *sc = &apm_softc;
554
555#ifdef APM_DEBUG
556	printf("called apm_event_enable()\n");
557#endif
558	if (sc->initialized) {
559		sc->active = 1;
560		apm_timeout(sc);
561	}
562}
563
564/* disable APM BIOS */
565static void
566apm_event_disable(void)
567{
568	struct apm_softc *sc = &apm_softc;
569
570#ifdef APM_DEBUG
571	printf("called apm_event_disable()\n");
572#endif
573	if (sc->initialized) {
574		untimeout(apm_timeout, NULL, apm_timeout_ch);
575		sc->active = 0;
576	}
577}
578
579/* halt CPU in scheduling loop */
580static void
581apm_halt_cpu(void)
582{
583	struct apm_softc *sc = &apm_softc;
584
585	if (sc->initialized)
586		sc->always_halt_cpu = 1;
587}
588
589/* don't halt CPU in scheduling loop */
590static void
591apm_not_halt_cpu(void)
592{
593	struct apm_softc *sc = &apm_softc;
594
595	if (sc->initialized)
596		sc->always_halt_cpu = 0;
597}
598
599/* device driver definitions */
600static int apmprobe (struct isa_device *);
601static int apmattach(struct isa_device *);
602struct isa_driver apmdriver = { apmprobe, apmattach, "apm" };
603
604/*
605 * probe APM (dummy):
606 *
607 * APM probing routine is placed on locore.s and apm_init.S because
608 * this process forces the CPU to turn to real mode or V86 mode.
609 * Current version uses real mode, but in a future version, we want
610 * to use V86 mode in APM initialization.
611 */
612
613static int
614apmprobe(struct isa_device *dvp)
615{
616	bzero(&apm_softc, sizeof(apm_softc));
617
618	if ( dvp->id_unit > 0 ) {
619		printf("apm: Only one APM driver supported.\n");
620		return 0;
621	}
622	switch (apm_version) {
623	case APMINI_CANTFIND:
624		/* silent */
625		return 0;
626	case APMINI_NOT32BIT:
627		printf("apm: 32bit connection is not supported.\n");
628		return 0;
629	case APMINI_CONNECTERR:
630		printf("apm: 32-bit connection error.\n");
631		return 0;
632	}
633	if (dvp->id_flags & 0x20)
634		statclock_disable = 1;
635	return -1;
636}
637
638
639/* Process APM event */
640static void
641apm_processevent(void)
642{
643	int apm_event;
644
645#ifdef APM_DEBUG
646#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
647	printf("Received APM Event: " #symbol "\n");
648#else
649#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
650#endif
651	do {
652		apm_event = apm_getevent();
653		switch (apm_event) {
654		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
655			apm_suspend();
656			break;
657		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
658			apm_suspend();
659			break;
660		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
661			apm_suspend();
662			break;
663		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
664			apm_suspend();
665			break;
666		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
667			apm_resume();
668			break;
669		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
670			apm_resume();
671			break;
672		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
673			apm_resume();
674			break;
675		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
676			apm_battery_low();
677			apm_suspend();
678			break;
679		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
680			break;
681		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
682			inittodr(0);	/* adjust time to RTC */
683			break;
684		    case PMEV_NOEVENT:
685			break;
686		    default:
687			printf("Unknown Original APM Event 0x%x\n", apm_event);
688			    break;
689		}
690	} while (apm_event != PMEV_NOEVENT);
691}
692
693/*
694 * Attach APM:
695 *
696 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
697 */
698
699static int
700apmattach(struct isa_device *dvp)
701{
702#define APM_KERNBASE	KERNBASE
703	struct apm_softc	*sc = &apm_softc;
704
705	sc->initialized = 0;
706
707	/* Must be externally enabled */
708	sc->active = 0;
709
710	/* setup APM parameters */
711	sc->cs16_base = (apm_cs16_base << 4) + APM_KERNBASE;
712	sc->cs32_base = (apm_cs32_base << 4) + APM_KERNBASE;
713	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
714	sc->cs_limit = apm_cs_limit;
715	sc->ds_limit = apm_ds_limit;
716	sc->cs_entry = apm_cs_entry;
717
718	/* Always call HLT in idle loop */
719	sc->always_halt_cpu = 1;
720
721	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
722	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
723	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
724
725	/* print bootstrap messages */
726#ifdef APM_DEBUG
727	printf("apm: APM BIOS version %04x\n",  apm_version);
728	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
729		sc->cs32_base, sc->cs16_base, sc->ds_base);
730	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
731		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
732		is_enabled(!sc->disabled));
733	printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
734		sc->cs_limit, sc->ds_limit);
735#endif /* APM_DEBUG */
736
737#if 0
738	/* Workaround for some buggy APM BIOS implementations */
739	sc->cs_limit = 0xffff;
740	sc->ds_limit = 0xffff;
741#endif
742
743	/* setup GDT */
744	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
745			sc->cs_limit, sc->ds_limit);
746
747	/* setup entry point 48bit pointer */
748	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
749	apm_addr.offset  = sc->cs_entry;
750
751	if ((dvp->id_flags & 0x10)) {
752		if ((dvp->id_flags & 0xf) >= 0x2) {
753			apm_driver_version(0x102);
754		}
755		if (!apm_version && (dvp->id_flags & 0xf) >= 0x1) {
756			apm_driver_version(0x101);
757		}
758	} else {
759		apm_driver_version(0x102);
760		if (!apm_version)
761			apm_driver_version(0x101);
762	}
763	if (!apm_version)
764		apm_version = 0x100;
765
766	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
767			((apm_version & 0x000f) >> 0);
768	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
769			((apm_version & 0x0f00) >> 8);
770
771	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
772
773#ifdef APM_DEBUG
774	if (sc->intversion >= INTVERSION(1, 1))
775		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
776#endif
777
778	printf("apm: found APM BIOS version %d.%d\n",
779		sc->majorversion, sc->minorversion);
780
781#ifdef APM_DEBUG
782	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
783#endif
784
785	/* enable power management */
786	if (sc->disabled) {
787		if (apm_enable_disable_pm(1)) {
788#ifdef APM_DEBUG
789			printf("apm: *Warning* enable function failed! [%x]\n",
790				apm_errno);
791#endif
792		}
793	}
794
795	/* engage power managment (APM 1.1 or later) */
796	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
797		if (apm_engage_disengage_pm(1)) {
798#ifdef APM_DEBUG
799			printf("apm: *Warning* engage function failed err=[%x]",
800				apm_errno);
801			printf(" (Docked or using external power?).\n");
802#endif
803		}
804	}
805
806        /* default suspend hook */
807        sc->sc_suspend.ah_fun = apm_default_suspend;
808        sc->sc_suspend.ah_arg = sc;
809        sc->sc_suspend.ah_name = "default suspend";
810        sc->sc_suspend.ah_order = APM_MAX_ORDER;
811
812        /* default resume hook */
813        sc->sc_resume.ah_fun = apm_default_resume;
814        sc->sc_resume.ah_arg = sc;
815        sc->sc_resume.ah_name = "default resume";
816        sc->sc_resume.ah_order = APM_MIN_ORDER;
817
818        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
819        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
820
821	apm_event_enable();
822
823	sc->initialized = 1;
824
825#ifdef DEVFS
826	sc->sc_devfs_token =
827		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
828#endif
829	return 0;
830}
831
832static int
833apmopen(dev_t dev, int flag, int fmt, struct proc *p)
834{
835	struct apm_softc *sc = &apm_softc;
836
837	if (minor(dev) != 0 || !sc->initialized)
838		return (ENXIO);
839
840	return 0;
841}
842
843static int
844apmclose(dev_t dev, int flag, int fmt, struct proc *p)
845{
846	return 0;
847}
848
849static int
850apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
851{
852	struct apm_softc *sc = &apm_softc;
853	int error = 0;
854	int newstate;
855
856	if (minor(dev) != 0 || !sc->initialized)
857		return (ENXIO);
858#ifdef APM_DEBUG
859	printf("APM ioctl: cmd = 0x%x\n", cmd);
860#endif
861	switch (cmd) {
862	case APMIO_SUSPEND:
863		if ( sc->active)
864			apm_suspend();
865		else
866			error = EINVAL;
867		break;
868	case APMIO_GETINFO_OLD:
869		{
870			struct apm_info info;
871			apm_info_old_t aiop;
872
873			if (apm_get_info(&info))
874				error = ENXIO;
875			aiop = (apm_info_old_t)addr;
876			aiop->ai_major = info.ai_major;
877			aiop->ai_minor = info.ai_minor;
878			aiop->ai_acline = info.ai_acline;
879			aiop->ai_batt_stat = info.ai_batt_stat;
880			aiop->ai_batt_life = info.ai_batt_life;
881			aiop->ai_status = info.ai_status;
882		}
883		break;
884	case APMIO_GETINFO:
885		if (apm_get_info((apm_info_t)addr))
886			error = ENXIO;
887		break;
888	case APMIO_ENABLE:
889		apm_event_enable();
890		break;
891	case APMIO_DISABLE:
892		apm_event_disable();
893		break;
894	case APMIO_HALTCPU:
895		apm_halt_cpu();
896		break;
897	case APMIO_NOTHALTCPU:
898		apm_not_halt_cpu();
899		break;
900	case APMIO_DISPLAY:
901		newstate = *(int *)addr;
902		if (apm_display(newstate))
903			error = ENXIO;
904		break;
905	case APMIO_BIOS:
906		if (apm_bios_call((struct apm_bios_arg*)addr))
907			error = EIO;
908		break;
909	default:
910		error = EINVAL;
911		break;
912	}
913	return error;
914}
915
916
917static apm_devsw_installed = 0;
918
919static void
920apm_drvinit(void *unused)
921{
922	dev_t dev;
923
924	if( ! apm_devsw_installed ) {
925		dev = makedev(CDEV_MAJOR,0);
926		cdevsw_add(&dev,&apm_cdevsw,NULL);
927		apm_devsw_installed = 1;
928    	}
929}
930
931SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
932