apm.c revision 34961 
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 1.69 1998/02/09 06:08:06 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	getmicrotime(&tmp_time);
368	timevaladd(&tmp_time, &diff_time);
369
370#ifdef FIXME
371	/* XXX THIS DOESN'T WORK!!! */
372	time = tmp_time;
373#endif
374
375#ifdef APM_FIXUP_CALLTODO
376	/* Calculate the delta time suspended */
377	timevalsub(&resume_time, &suspend_time);
378	/* Fixup the calltodo list with the delta time. */
379	adjust_timeout_calltodo(&resume_time);
380#endif /* APM_FIXUP_CALLTODOK */
381	splx(pl);
382#ifndef APM_FIXUP_CALLTODO
383	second = resume_time.tv_sec - suspend_time.tv_sec;
384#else /* APM_FIXUP_CALLTODO */
385	/*
386	 * We've already calculated resume_time to be the delta between
387	 * the suspend and the resume.
388	 */
389	second = resume_time.tv_sec;
390#endif /* APM_FIXUP_CALLTODO */
391	hour = second / 3600;
392	second %= 3600;
393	minute = second / 60;
394	second %= 60;
395	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
396		hour, minute, second);
397	return 0;
398}
399
400static int
401apm_default_suspend(void *arg)
402{
403	int	pl;
404
405	pl = splsoftclock();
406	microtime(&diff_time);
407	inittodr(0);
408	microtime(&suspend_time);
409	timevalsub(&diff_time, &suspend_time);
410	splx(pl);
411	return 0;
412}
413
414static void apm_processevent(void);
415
416/*
417 * Public interface to the suspend/resume:
418 *
419 * Execute suspend and resume hook before and after sleep, respectively.
420 *
421 */
422
423void
424apm_suspend(void)
425{
426	struct apm_softc *sc = &apm_softc;
427
428	if (!sc)
429		return;
430
431	if (sc->initialized) {
432		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
433		if (apm_suspend_system() == 0)
434			apm_processevent();
435		else
436			/* Failure, 'resume' the system again */
437			apm_execute_hook(hook[APM_HOOK_RESUME]);
438	}
439}
440
441void
442apm_resume(void)
443{
444	struct apm_softc *sc = &apm_softc;
445
446	if (!sc)
447		return;
448
449	if (sc->initialized)
450		apm_execute_hook(hook[APM_HOOK_RESUME]);
451}
452
453
454/* get APM information */
455static int
456apm_get_info(apm_info_t aip)
457{
458	struct apm_softc *sc = &apm_softc;
459	u_long eax, ebx, ecx, edx;
460
461	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
462	ebx = PMDV_ALLDEV;
463	ecx = 0;
464	edx = 0xffff;			/* default to unknown battery time */
465
466	if (apm_int(&eax, &ebx, &ecx, &edx))
467		return 1;
468
469	aip->ai_infoversion = 0;
470	aip->ai_acline      = (ebx >> 8) & 0xff;
471	aip->ai_batt_stat   = ebx & 0xff;
472	aip->ai_batt_life   = ecx & 0xff;
473	aip->ai_major       = (u_int)sc->majorversion;
474	aip->ai_minor       = (u_int)sc->minorversion;
475	aip->ai_status      = (u_int)sc->active;
476	edx &= 0xffff;
477	if (edx == 0xffff)	/* Time is unknown */
478		aip->ai_batt_time = -1;
479	else if (edx & 0x8000)	/* Time is in minutes */
480		aip->ai_batt_time = (edx & 0x7fff) * 60;
481	else			/* Time is in seconds */
482		aip->ai_batt_time = edx;
483	bzero(aip->ai_spare, sizeof aip->ai_spare);
484
485	return 0;
486}
487
488
489/* inform APM BIOS that CPU is idle */
490void
491apm_cpu_idle(void)
492{
493	struct apm_softc *sc = &apm_softc;
494
495	if (sc->active) {
496		u_long eax, ebx, ecx, edx;
497
498		eax = (APM_BIOS <<8) | APM_CPUIDLE;
499		edx = ecx = ebx = 0;
500		apm_int(&eax, &ebx, &ecx, &edx);
501	}
502	/*
503	 * Some APM implementation halts CPU in BIOS, whenever
504	 * "CPU-idle" function are invoked, but swtch() of
505	 * FreeBSD halts CPU, therefore, CPU is halted twice
506	 * in the sched loop. It makes the interrupt latency
507	 * terribly long and be able to cause a serious problem
508	 * in interrupt processing. We prevent it by removing
509	 * "hlt" operation from swtch() and managed it under
510	 * APM driver.
511	 */
512	if (!sc->active || sc->always_halt_cpu)
513		__asm("hlt");	/* wait for interrupt */
514}
515
516/* inform APM BIOS that CPU is busy */
517void
518apm_cpu_busy(void)
519{
520	struct apm_softc *sc = &apm_softc;
521
522	/*
523	 * The APM specification says this is only necessary if your BIOS
524	 * slows down the processor in the idle task, otherwise it's not
525	 * necessary.
526	 */
527	if (sc->slow_idle_cpu && sc->active) {
528		u_long eax, ebx, ecx, edx;
529
530		eax = (APM_BIOS <<8) | APM_CPUBUSY;
531		edx = ecx = ebx = 0;
532		apm_int(&eax, &ebx, &ecx, &edx);
533	}
534}
535
536
537/*
538 * APM timeout routine:
539 *
540 * This routine is automatically called by timer once per second.
541 */
542
543static void
544apm_timeout(void *dummy)
545{
546	struct apm_softc *sc = &apm_softc;
547
548	apm_processevent();
549	if (sc->active == 1)
550		/* Run slightly more oftan than 1 Hz */
551		apm_timeout_ch = timeout(apm_timeout, NULL, hz - 1 );
552}
553
554/* enable APM BIOS */
555static void
556apm_event_enable(void)
557{
558	struct apm_softc *sc = &apm_softc;
559
560#ifdef APM_DEBUG
561	printf("called apm_event_enable()\n");
562#endif
563	if (sc->initialized) {
564		sc->active = 1;
565		apm_timeout(sc);
566	}
567}
568
569/* disable APM BIOS */
570static void
571apm_event_disable(void)
572{
573	struct apm_softc *sc = &apm_softc;
574
575#ifdef APM_DEBUG
576	printf("called apm_event_disable()\n");
577#endif
578	if (sc->initialized) {
579		untimeout(apm_timeout, NULL, apm_timeout_ch);
580		sc->active = 0;
581	}
582}
583
584/* halt CPU in scheduling loop */
585static void
586apm_halt_cpu(void)
587{
588	struct apm_softc *sc = &apm_softc;
589
590	if (sc->initialized)
591		sc->always_halt_cpu = 1;
592}
593
594/* don't halt CPU in scheduling loop */
595static void
596apm_not_halt_cpu(void)
597{
598	struct apm_softc *sc = &apm_softc;
599
600	if (sc->initialized)
601		sc->always_halt_cpu = 0;
602}
603
604/* device driver definitions */
605static int apmprobe (struct isa_device *);
606static int apmattach(struct isa_device *);
607struct isa_driver apmdriver = { apmprobe, apmattach, "apm" };
608
609/*
610 * probe APM (dummy):
611 *
612 * APM probing routine is placed on locore.s and apm_init.S because
613 * this process forces the CPU to turn to real mode or V86 mode.
614 * Current version uses real mode, but in a future version, we want
615 * to use V86 mode in APM initialization.
616 */
617
618static int
619apmprobe(struct isa_device *dvp)
620{
621	bzero(&apm_softc, sizeof(apm_softc));
622
623	if ( dvp->id_unit > 0 ) {
624		printf("apm: Only one APM driver supported.\n");
625		return 0;
626	}
627	switch (apm_version) {
628	case APMINI_CANTFIND:
629		/* silent */
630		return 0;
631	case APMINI_NOT32BIT:
632		printf("apm: 32bit connection is not supported.\n");
633		return 0;
634	case APMINI_CONNECTERR:
635		printf("apm: 32-bit connection error.\n");
636		return 0;
637	}
638	if (dvp->id_flags & 0x20)
639		statclock_disable = 1;
640	return -1;
641}
642
643
644/* Process APM event */
645static void
646apm_processevent(void)
647{
648	int apm_event;
649
650#ifdef APM_DEBUG
651#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
652	printf("Received APM Event: " #symbol "\n");
653#else
654#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
655#endif
656	do {
657		apm_event = apm_getevent();
658		switch (apm_event) {
659		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
660			apm_suspend();
661			break;
662		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
663			apm_suspend();
664			break;
665		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
666			apm_suspend();
667			break;
668		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
669			apm_suspend();
670			break;
671		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
672			apm_resume();
673			break;
674		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
675			apm_resume();
676			break;
677		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
678			apm_resume();
679			break;
680		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
681			apm_battery_low();
682			apm_suspend();
683			break;
684		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
685			break;
686		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
687			inittodr(0);	/* adjust time to RTC */
688			break;
689		    case PMEV_NOEVENT:
690			break;
691		    default:
692			printf("Unknown Original APM Event 0x%x\n", apm_event);
693			    break;
694		}
695	} while (apm_event != PMEV_NOEVENT);
696}
697
698/*
699 * Attach APM:
700 *
701 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
702 */
703
704static int
705apmattach(struct isa_device *dvp)
706{
707#define APM_KERNBASE	KERNBASE
708	struct apm_softc	*sc = &apm_softc;
709
710	sc->initialized = 0;
711
712	/* Must be externally enabled */
713	sc->active = 0;
714
715	/* setup APM parameters */
716	sc->cs16_base = (apm_cs16_base << 4) + APM_KERNBASE;
717	sc->cs32_base = (apm_cs32_base << 4) + APM_KERNBASE;
718	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
719	sc->cs_limit = apm_cs_limit;
720	sc->ds_limit = apm_ds_limit;
721	sc->cs_entry = apm_cs_entry;
722
723	/* Always call HLT in idle loop */
724	sc->always_halt_cpu = 1;
725
726	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
727	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
728	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
729
730	/* print bootstrap messages */
731#ifdef APM_DEBUG
732	printf("apm: APM BIOS version %04x\n",  apm_version);
733	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
734		sc->cs32_base, sc->cs16_base, sc->ds_base);
735	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
736		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
737		is_enabled(!sc->disabled));
738	printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
739		sc->cs_limit, sc->ds_limit);
740#endif /* APM_DEBUG */
741
742#if 0
743	/* Workaround for some buggy APM BIOS implementations */
744	sc->cs_limit = 0xffff;
745	sc->ds_limit = 0xffff;
746#endif
747
748	/* setup GDT */
749	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
750			sc->cs_limit, sc->ds_limit);
751
752	/* setup entry point 48bit pointer */
753	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
754	apm_addr.offset  = sc->cs_entry;
755
756	if ((dvp->id_flags & 0x10)) {
757		if ((dvp->id_flags & 0xf) >= 0x2) {
758			apm_driver_version(0x102);
759		}
760		if (!apm_version && (dvp->id_flags & 0xf) >= 0x1) {
761			apm_driver_version(0x101);
762		}
763	} else {
764		apm_driver_version(0x102);
765		if (!apm_version)
766			apm_driver_version(0x101);
767	}
768	if (!apm_version)
769		apm_version = 0x100;
770
771	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
772			((apm_version & 0x000f) >> 0);
773	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
774			((apm_version & 0x0f00) >> 8);
775
776	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
777
778#ifdef APM_DEBUG
779	if (sc->intversion >= INTVERSION(1, 1))
780		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
781#endif
782
783	printf("apm: found APM BIOS version %d.%d\n",
784		sc->majorversion, sc->minorversion);
785
786#ifdef APM_DEBUG
787	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
788#endif
789
790	/* enable power management */
791	if (sc->disabled) {
792		if (apm_enable_disable_pm(1)) {
793#ifdef APM_DEBUG
794			printf("apm: *Warning* enable function failed! [%x]\n",
795				apm_errno);
796#endif
797		}
798	}
799
800	/* engage power managment (APM 1.1 or later) */
801	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
802		if (apm_engage_disengage_pm(1)) {
803#ifdef APM_DEBUG
804			printf("apm: *Warning* engage function failed err=[%x]",
805				apm_errno);
806			printf(" (Docked or using external power?).\n");
807#endif
808		}
809	}
810
811        /* default suspend hook */
812        sc->sc_suspend.ah_fun = apm_default_suspend;
813        sc->sc_suspend.ah_arg = sc;
814        sc->sc_suspend.ah_name = "default suspend";
815        sc->sc_suspend.ah_order = APM_MAX_ORDER;
816
817        /* default resume hook */
818        sc->sc_resume.ah_fun = apm_default_resume;
819        sc->sc_resume.ah_arg = sc;
820        sc->sc_resume.ah_name = "default resume";
821        sc->sc_resume.ah_order = APM_MIN_ORDER;
822
823        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
824        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
825
826	apm_event_enable();
827
828	sc->initialized = 1;
829
830#ifdef DEVFS
831	sc->sc_devfs_token =
832		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
833#endif
834	return 0;
835}
836
837static int
838apmopen(dev_t dev, int flag, int fmt, struct proc *p)
839{
840	struct apm_softc *sc = &apm_softc;
841
842	if (minor(dev) != 0 || !sc->initialized)
843		return (ENXIO);
844
845	return 0;
846}
847
848static int
849apmclose(dev_t dev, int flag, int fmt, struct proc *p)
850{
851	return 0;
852}
853
854static int
855apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
856{
857	struct apm_softc *sc = &apm_softc;
858	int error = 0;
859	int newstate;
860
861	if (minor(dev) != 0 || !sc->initialized)
862		return (ENXIO);
863#ifdef APM_DEBUG
864	printf("APM ioctl: cmd = 0x%x\n", cmd);
865#endif
866	switch (cmd) {
867	case APMIO_SUSPEND:
868		if ( sc->active)
869			apm_suspend();
870		else
871			error = EINVAL;
872		break;
873	case APMIO_GETINFO_OLD:
874		{
875			struct apm_info info;
876			apm_info_old_t aiop;
877
878			if (apm_get_info(&info))
879				error = ENXIO;
880			aiop = (apm_info_old_t)addr;
881			aiop->ai_major = info.ai_major;
882			aiop->ai_minor = info.ai_minor;
883			aiop->ai_acline = info.ai_acline;
884			aiop->ai_batt_stat = info.ai_batt_stat;
885			aiop->ai_batt_life = info.ai_batt_life;
886			aiop->ai_status = info.ai_status;
887		}
888		break;
889	case APMIO_GETINFO:
890		if (apm_get_info((apm_info_t)addr))
891			error = ENXIO;
892		break;
893	case APMIO_ENABLE:
894		apm_event_enable();
895		break;
896	case APMIO_DISABLE:
897		apm_event_disable();
898		break;
899	case APMIO_HALTCPU:
900		apm_halt_cpu();
901		break;
902	case APMIO_NOTHALTCPU:
903		apm_not_halt_cpu();
904		break;
905	case APMIO_DISPLAY:
906		newstate = *(int *)addr;
907		if (apm_display(newstate))
908			error = ENXIO;
909		break;
910	case APMIO_BIOS:
911		if (apm_bios_call((struct apm_bios_arg*)addr))
912			error = EIO;
913		break;
914	default:
915		error = EINVAL;
916		break;
917	}
918	return error;
919}
920
921
922static apm_devsw_installed = 0;
923
924static void
925apm_drvinit(void *unused)
926{
927	dev_t dev;
928
929	if( ! apm_devsw_installed ) {
930		dev = makedev(CDEV_MAJOR,0);
931		cdevsw_add(&dev,&apm_cdevsw,NULL);
932		apm_devsw_installed = 1;
933    	}
934}
935
936SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
937