apm.c revision 14714 
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@mt.cs.keio.ac.jp>
6 *
7 * This software may be used, modified, copied, and distributed, in
8 * both source and binary form provided that the above copyright and
9 * these terms are retained. Under no circumstances is the author
10 * responsible for the proper functioning of this software, nor does
11 * the author assume any responsibility for damages incurred with its
12 * use.
13 *
14 * Sep, 1994	Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
15 *
16 *	$Id: apm.c,v 1.34 1996/03/19 04:49:13 nate Exp $
17 */
18
19#include "apm.h"
20
21#if NAPM > 1
22#error only one APM device may be configured
23#endif
24
25#include <sys/param.h>
26#include <sys/conf.h>
27#include <sys/kernel.h>
28#ifdef DEVFS
29#include <sys/devfsext.h>
30#endif /*DEVFS*/
31#include <sys/systm.h>
32#include <sys/malloc.h>
33#include <sys/ioctl.h>
34#include <sys/file.h>
35#include <sys/proc.h>
36#include <sys/vnode.h>
37#include "i386/isa/isa.h"
38#include "i386/isa/isa_device.h"
39#include <machine/apm_bios.h>
40#include <machine/segments.h>
41#include <machine/clock.h>
42#include <vm/vm.h>
43#include <vm/vm_param.h>
44#include <vm/pmap.h>
45#include <sys/syslog.h>
46#include <sys/devconf.h>
47#include "apm_setup.h"
48
49static int apm_display_off __P((void));
50static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx));
51static void apm_resume __P((void));
52
53/* static data */
54struct apm_softc {
55	int	initialized, active, halt_cpu;
56	u_int	minorversion, majorversion;
57	u_int	cs32_base, cs16_base, ds_base;
58	u_int	cs_limit, ds_limit;
59	u_int	cs_entry;
60	u_int	intversion;
61	int	idle_cpu, disabled, disengaged;
62	struct apmhook sc_suspend;
63	struct apmhook sc_resume;
64	void 	*sc_devfs_token;
65};
66
67static struct kern_devconf kdc_apm = {
68	0, 0, 0,		/* filled in by dev_attach */
69	"apm", 0, { MDDT_ISA, 0 },
70	isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
71	&kdc_isa0,		/* parent */
72	0,			/* parentdata */
73	DC_UNCONFIGURED,	/* state */
74	"APM BIOS",
75	DC_CLS_MISC		/* class */
76};
77
78
79static struct apm_softc apm_softc;
80static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
81
82#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
83
84/* Map version number to integer (keeps ordering of version numbers) */
85#define INTVERSION(major, minor)	((major)*100 + (minor))
86
87static timeout_t apm_timeout;
88static d_open_t apmopen;
89static d_close_t apmclose;
90static d_ioctl_t apmioctl;
91
92#define CDEV_MAJOR 39
93static struct cdevsw apm_cdevsw =
94	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
95	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
96	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
97
98static void
99apm_registerdev(struct isa_device *id)
100{
101	if (kdc_apm.kdc_isa)
102		return;
103	kdc_apm.kdc_state = DC_UNCONFIGURED;
104	kdc_apm.kdc_description = "APM BIOS";
105	kdc_apm.kdc_unit = 0;
106	kdc_apm.kdc_isa = id;
107	dev_attach(&kdc_apm);
108}
109
110/* setup APM GDT discriptors */
111static void
112setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
113{
114	/* setup 32bit code segment */
115	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
116	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
117
118	/* setup 16bit code segment */
119	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
120	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
121
122	/* setup data segment */
123	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
124	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
125
126	/* reflect these changes on physical GDT */
127	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
128	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
129	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
130}
131
132/* 48bit far pointer */
133static struct addr48 {
134	u_long		offset;
135	u_short		segment;
136} apm_addr;
137
138static int apm_errno;
139
140inline
141int
142apm_int(u_long *eax, u_long *ebx, u_long *ecx)
143{
144	u_long cf;
145	__asm ("pushl	%%ebp
146		pushl	%%edx
147		pushl	%%esi
148		xorl	%3,%3
149		movl	%3,%%esi
150		lcall	_apm_addr
151		jnc	1f
152		incl	%3
153	1:
154		popl	%%esi
155		popl	%%edx
156		popl	%%ebp"
157		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
158		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
159		);
160	apm_errno = ((*eax) >> 8) & 0xff;
161	return cf;
162}
163
164
165/* enable/disable power management */
166static int
167apm_enable_disable_pm(struct apm_softc *sc, int enable)
168{
169	u_long eax, ebx, ecx;
170
171	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
172
173	if (sc->intversion >= INTVERSION(1, 1)) {
174		ebx  = PMDV_ALLDEV;
175	} else {
176		ebx  = 0xffff;	/* APM version 1.0 only */
177	}
178	ecx  = enable;
179	return apm_int(&eax, &ebx, &ecx);
180}
181
182/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
183static void
184apm_driver_version(void)
185{
186	u_long eax, ebx, ecx;
187
188#ifdef APM_DEBUG
189	eax = (APM_BIOS<<8) | APM_INSTCHECK;
190	ebx  = 0x0;
191	ecx  = 0x0101;
192	i = apm_int(&eax, &ebx, &ecx);
193	printf("[%04lx %04lx %04lx %ld %02x]\n",
194		eax, ebx, ecx, i, apm_errno);
195#endif
196
197	eax = (APM_BIOS << 8) | APM_DRVVERSION;
198	ebx  = 0x0;
199	ecx  = 0x0101;
200	if(!apm_int(&eax, &ebx, &ecx))
201		apm_version = eax & 0xffff;
202
203#ifdef APM_DEBUG
204	eax = (APM_BIOS << 8) | APM_INSTCHECK;
205	ebx  = 0x0;
206	ecx  = 0x0101;
207	i = apm_int(&eax, &ebx, &ecx);
208	printf("[%04lx %04lx %04lx %ld %02x]\n",
209		eax, ebx, ecx, i, apm_errno);
210#endif
211}
212
213/* engage/disengage power management (APM 1.1 or later) */
214static int
215apm_engage_disengage_pm(struct apm_softc *sc, int engage)
216{
217	u_long eax, ebx, ecx, i;
218
219	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
220	ebx = PMDV_ALLDEV;
221	ecx = engage;
222	i = apm_int(&eax, &ebx, &ecx);
223	return i;
224}
225
226/* get PM event */
227static u_int
228apm_getevent(struct apm_softc *sc)
229{
230	u_long eax, ebx, ecx;
231
232	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
233
234	ebx = 0;
235	ecx = 0;
236	if (apm_int(&eax, &ebx, &ecx))
237		return PMEV_NOEVENT;
238
239	return ebx & 0xffff;
240}
241
242/* suspend entire system */
243static int
244apm_suspend_system(struct apm_softc *sc)
245{
246	u_long eax, ebx, ecx;
247
248	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
249	ebx = PMDV_ALLDEV;
250	ecx = PMST_SUSPEND;
251
252	__asm("cli");
253	if (apm_int(&eax, &ebx, &ecx)) {
254		__asm("sti");
255		printf("Entire system suspend failure: errcode = %ld\n",
256			0xff & (eax >> 8));
257		return 1;
258	}
259	__asm("sti");
260	return 0;
261}
262
263/* Display control */
264/*
265 * Experimental implementation: My laptop machine can't handle this function
266 * If your laptop can control the display via APM, please inform me.
267 *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
268 */
269static int
270apm_display_off(void)
271{
272	u_long eax, ebx, ecx;
273
274	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
275	ebx = PMDV_2NDSTORAGE0;
276	ecx = PMST_STANDBY;
277	if (apm_int(&eax, &ebx, &ecx)) {
278		printf("Display off failure: errcode = %ld\n",
279			0xff & (eax >> 8));
280		return 1;
281	}
282
283	return 0;
284}
285
286/* APM Battery low handler */
287static void
288apm_battery_low(struct apm_softc *sc)
289{
290	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
291}
292
293/* APM hook manager */
294static struct apmhook *
295apm_add_hook(struct apmhook **list, struct apmhook *ah)
296{
297	int s;
298	struct apmhook *p, *prev;
299
300#if 0
301	printf("Add hook \"%s\"\n", ah->ah_name);
302#endif
303
304	s = splhigh();
305	if (ah == NULL) {
306		panic("illegal apm_hook!");
307	}
308	prev = NULL;
309	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
310		if (p->ah_order > ah->ah_order) {
311			break;
312		}
313	}
314
315	if (prev == NULL) {
316		ah->ah_next = *list;
317		*list = ah;
318	} else {
319		ah->ah_next = prev->ah_next;
320		prev->ah_next = ah;
321	}
322	splx(s);
323	return ah;
324}
325
326static void
327apm_del_hook(struct apmhook **list, struct apmhook *ah)
328{
329	int s;
330	struct apmhook *p, *prev;
331
332	s = splhigh();
333	prev = NULL;
334	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
335		if (p == ah) {
336			goto deleteit;
337		}
338	}
339	panic("Tried to delete unregistered apm_hook.");
340	goto nosuchnode;
341deleteit:
342	if (prev != NULL) {
343		prev->ah_next = p->ah_next;
344	} else {
345		*list = p->ah_next;
346	}
347nosuchnode:
348	splx(s);
349}
350
351
352/* APM driver calls some functions automatically */
353static void
354apm_execute_hook(struct apmhook *list)
355{
356	struct apmhook *p;
357
358	for (p = list; p != NULL; p = p->ah_next) {
359#if 0
360		printf("Execute APM hook \"%s.\"\n", p->ah_name);
361#endif
362		if ((*(p->ah_fun))(p->ah_arg)) {
363			printf("Warning: APM hook \"%s\" failed", p->ah_name);
364		}
365	}
366}
367
368
369/* establish an apm hook */
370struct apmhook *
371apm_hook_establish(int apmh, struct apmhook *ah)
372{
373	if (apmh < 0 || apmh >= NAPM_HOOK)
374		return NULL;
375
376	return apm_add_hook(&hook[apmh], ah);
377}
378
379#ifdef notused
380/* disestablish an apm hook */
381void
382apm_hook_disestablish(int apmh, struct apmhook *ah)
383{
384	if (apmh < 0 || apmh >= NAPM_HOOK)
385		return;
386
387	apm_del_hook(&hook[apmh], ah);
388}
389#endif /* notused */
390
391
392static struct timeval suspend_time;
393static struct timeval diff_time;
394
395static int
396apm_default_resume(void *arg)
397{
398	int pl;
399	u_int second, minute, hour;
400	struct timeval resume_time, tmp_time;
401
402	/* modified for adjkerntz */
403	pl = splsoftclock();
404	inittodr(0);			/* adjust time to RTC */
405	microtime(&resume_time);
406	tmp_time = time;		/* because 'time' is volatile */
407	timevaladd(&tmp_time, &diff_time);
408	time = tmp_time;
409	splx(pl);
410	second = resume_time.tv_sec - suspend_time.tv_sec;
411	hour = second / 3600;
412	second %= 3600;
413	minute = second / 60;
414	second %= 60;
415	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
416		hour, minute, second);
417	return 0;
418}
419
420static int
421apm_default_suspend(void *arg)
422{
423	int	pl;
424
425	pl = splsoftclock();
426	microtime(&diff_time);
427	inittodr(0);
428	microtime(&suspend_time);
429	timevalsub(&diff_time, &suspend_time);
430	splx(pl);
431	return 0;
432}
433
434static void apm_processevent(struct apm_softc *);
435
436/*
437 * Public interface to the suspend/resume:
438 *
439 * Execute suspend and resume hook before and after sleep, respectively.
440 *
441 */
442
443void
444apm_suspend(void)
445{
446	struct apm_softc *sc = &apm_softc;
447
448	if (!sc)
449		return;
450
451	if (sc->initialized) {
452		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
453		apm_suspend_system(sc);
454		apm_processevent(sc);
455	}
456}
457
458void
459apm_resume(void)
460{
461	struct apm_softc *sc = &apm_softc;
462
463	if (!sc)
464		return;
465
466	if (sc->initialized) {
467		apm_execute_hook(hook[APM_HOOK_RESUME]);
468	}
469}
470
471
472/* get APM information */
473static int
474apm_get_info(struct apm_softc *sc, apm_info_t aip)
475{
476	u_long eax, ebx, ecx;
477
478	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
479	ebx = PMDV_ALLDEV;
480	ecx = 0;
481
482	if (apm_int(&eax, &ebx, &ecx))
483		return 1;
484
485	aip->ai_acline    = (ebx >> 8) & 0xff;
486	aip->ai_batt_stat = ebx & 0xff;
487	aip->ai_batt_life = ecx & 0xff;
488	aip->ai_major     = (u_int)sc->majorversion;
489	aip->ai_minor     = (u_int)sc->minorversion;
490	aip->ai_status    = (u_int)sc->active;
491
492	return 0;
493}
494
495
496/* inform APM BIOS that CPU is idle */
497void
498apm_cpu_idle(void)
499{
500	struct apm_softc *sc = &apm_softc;
501
502	if (sc->idle_cpu) {
503		if (sc->active) {
504			u_long eax, ebx, ecx;
505
506			eax = (APM_BIOS <<8) | APM_CPUIDLE;
507			ecx = ebx = 0;
508			apm_int(&eax, &ebx, &ecx);
509		}
510	}
511	/*
512	 * Some APM implementation halts CPU in BIOS, whenever
513	 * "CPU-idle" function are invoked, but swtch() of
514	 * FreeBSD halts CPU, therefore, CPU is halted twice
515	 * in the sched loop. It makes the interrupt latency
516	 * terribly long and be able to cause a serious problem
517	 * in interrupt processing. We prevent it by removing
518	 * "hlt" operation from swtch() and managed it under
519	 * APM driver.
520	 */
521	if (!sc->active || sc->halt_cpu) {
522		__asm("hlt");	/* wait for interrupt */
523	}
524}
525
526/* inform APM BIOS that CPU is busy */
527void
528apm_cpu_busy(void)
529{
530	struct apm_softc *sc = &apm_softc;
531
532	if (sc->idle_cpu && sc->active) {
533		u_long eax, ebx, ecx;
534
535		eax = (APM_BIOS <<8) | APM_CPUIDLE;
536		ecx = ebx = 0;
537		apm_int(&eax, &ebx, &ecx);
538	}
539}
540
541
542/*
543 * APM timeout routine:
544 *
545 * This routine is automatically called by timer once per second.
546 */
547
548static void
549apm_timeout(void *arg)
550{
551	struct apm_softc *sc = arg;
552
553	apm_processevent(sc);
554	if (sc->active == 1) {
555		timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
556	}
557}
558
559/* enable APM BIOS */
560static void
561apm_event_enable(struct apm_softc *sc)
562{
563#ifdef APM_DEBUG
564	printf("called apm_event_enable()\n");
565#endif
566	if (sc->initialized) {
567		sc->active = 1;
568		apm_timeout(sc);
569	}
570}
571
572/* disable APM BIOS */
573static void
574apm_event_disable(struct apm_softc *sc)
575{
576#ifdef APM_DEBUG
577	printf("called apm_event_disable()\n");
578#endif
579	if (sc->initialized) {
580		untimeout(apm_timeout, NULL);
581		sc->active = 0;
582	}
583}
584
585/* halt CPU in scheduling loop */
586static void
587apm_halt_cpu(struct apm_softc *sc)
588{
589	if (sc->initialized) {
590		sc->halt_cpu = 1;
591	}
592}
593
594/* don't halt CPU in scheduling loop */
595static void
596apm_not_halt_cpu(struct apm_softc *sc)
597{
598	if (sc->initialized) {
599		sc->halt_cpu = 0;
600	}
601}
602
603/* device driver definitions */
604static int apmprobe (struct isa_device *);
605static int apmattach(struct isa_device *);
606struct isa_driver apmdriver = {
607	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 on future version, we want
615 * to use V86 mode in APM initialization.
616 */
617
618static int
619apmprobe(struct isa_device *dvp)
620{
621	if ( dvp->id_unit > 0 ) {
622		printf("apm: Only one APM driver supported.\n");
623		return 0;
624	}
625	apm_registerdev(dvp);
626	switch (apm_version) {
627	case APMINI_CANTFIND:
628		/* silent */
629		return 0;
630	case APMINI_NOT32BIT:
631		printf("apm: 32bit connection is not supported.\n");
632		return 0;
633	case APMINI_CONNECTERR:
634		printf("apm: 32-bit connection error.\n");
635		return 0;
636	}
637
638	return -1;
639}
640
641
642/* Process APM event */
643static void
644apm_processevent(struct apm_softc *sc)
645{
646	int apm_event;
647
648#ifdef APM_DEBUG
649#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
650	printf("Original APM Event: " #symbol "\n");
651#else
652#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
653#endif
654	while (1) {
655		apm_event = apm_getevent(sc);
656		if (apm_event == PMEV_NOEVENT)
657			break;
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(sc);
682			apm_suspend();
683			break;
684
685		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
686			break;
687
688		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
689			inittodr(0);	/* adjust time to RTC */
690			break;
691
692		    default:
693			printf("Unknown Original APM Event 0x%x\n", apm_event);
694			    break;
695		}
696	}
697}
698
699/*
700 * Attach APM:
701 *
702 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
703 */
704
705static int
706apmattach(struct isa_device *dvp)
707{
708#define APM_KERNBASE	KERNBASE
709	struct apm_softc	*sc = &apm_softc;
710
711	sc->initialized = 0;
712
713	/* Must be externally enabled */
714	sc->active = 0;
715
716	/* setup APM parameters */
717	sc->cs16_base = (apm_cs32_base << 4) + APM_KERNBASE;
718	sc->cs32_base = (apm_cs16_base << 4) + APM_KERNBASE;
719	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
720	sc->cs_limit = apm_cs_limit;
721	sc->ds_limit = apm_ds_limit;
722	sc->cs_entry = apm_cs_entry;
723
724	sc->halt_cpu = 1;
725	sc->idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
726	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
727	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
728
729	/* print bootstrap messages */
730#ifdef APM_DEBUG
731	printf(" found APM BIOS version %04x\n",  apm_version);
732	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
733		sc->cs32_base, sc->cs16_base, sc->ds_base);
734	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
735		sc->cs_entry, is_enabled(sc->idle_cpu),
736		is_enabled(!sc->disabled));
737	printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
738#endif /* APM_DEBUG */
739
740	/* Workaround for some buggy APM BIOS implementations */
741	sc->cs_limit = 0xffff;
742	sc->ds_limit = 0xffff;
743
744	/* setup GDT */
745	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
746			sc->cs_limit, sc->ds_limit);
747
748	/* setup entry point 48bit pointer */
749	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
750	apm_addr.offset  = sc->cs_entry;
751
752	/* Try to kick bios into 1.1 mode */
753	apm_driver_version();
754	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
755			((apm_version & 0x000f) >> 0);
756	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
757			((apm_version & 0x0f00) >> 8);
758
759	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
760
761	if (sc->intversion >= INTVERSION(1, 1)) {
762		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
763	}
764
765	printf(" found APM BIOS version %d.%d\n",
766		sc->majorversion, sc->minorversion);
767	printf("apm: Idling CPU %s\n", is_enabled(sc->idle_cpu));
768
769	/* enable power management */
770	if (sc->disabled) {
771		if (apm_enable_disable_pm(sc, 1)) {
772			printf("Warning: APM enable function failed! [%x]\n",
773				apm_errno);
774		}
775	}
776
777	/* engage power managment (APM 1.1 or later) */
778	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
779		if (apm_engage_disengage_pm(sc, 1)) {
780			printf("Warning: APM engage function failed [%x]\n",
781				apm_errno);
782		}
783	}
784
785        /* default suspend hook */
786        sc->sc_suspend.ah_fun = apm_default_suspend;
787        sc->sc_suspend.ah_arg = sc;
788        sc->sc_suspend.ah_name = "default suspend";
789        sc->sc_suspend.ah_order = APM_MAX_ORDER;
790
791        /* default resume hook */
792        sc->sc_resume.ah_fun = apm_default_resume;
793        sc->sc_resume.ah_arg = sc;
794        sc->sc_resume.ah_name = "default resume";
795        sc->sc_resume.ah_order = APM_MIN_ORDER;
796
797        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
798        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
799
800	apm_event_enable(sc);
801	kdc_apm.kdc_state = DC_IDLE;
802
803	sc->initialized = 1;
804
805#ifdef DEVFS
806	sc->sc_devfs_token = devfs_add_devsw(
807		"/",	"apm",	&apm_cdevsw,	0,	DV_CHR,	0,  0, 0600);
808#endif
809	return 0;
810}
811
812static int
813apmopen(dev_t dev, int flag, int fmt, struct proc *p)
814{
815	struct apm_softc *sc = &apm_softc;
816
817	if (minor(dev) != 0 || !sc->initialized)
818		return (ENXIO);
819
820	return 0;
821}
822
823static int
824apmclose(dev_t dev, int flag, int fmt, struct proc *p)
825{
826	return 0;
827}
828
829static int
830apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
831{
832	struct apm_softc *sc = &apm_softc;
833	int error = 0;
834
835	if (minor(dev) != 0 || !sc->initialized)
836		return (ENXIO);
837#ifdef APM_DEBUG
838	printf("APM ioctl: cmd = 0x%x\n", cmd);
839#endif
840	switch (cmd) {
841	case APMIO_SUSPEND:
842		if ( sc->active) {
843			apm_suspend();
844		} else {
845			error = EINVAL;
846		}
847		break;
848	case APMIO_GETINFO:
849		if (apm_get_info(sc, (apm_info_t)addr)) {
850			error = ENXIO;
851		}
852		break;
853	case APMIO_ENABLE:
854		kdc_apm.kdc_state = DC_BUSY;
855		apm_event_enable(sc);
856		break;
857	case APMIO_DISABLE:
858		kdc_apm.kdc_state = DC_IDLE;
859		apm_event_disable(sc);
860		break;
861	case APMIO_HALTCPU:
862		apm_halt_cpu(sc);
863		break;
864	case APMIO_NOTHALTCPU:
865		apm_not_halt_cpu(sc);
866		break;
867	case APMIO_DISPLAYOFF:
868		if (apm_display_off()) {
869			error = ENXIO;
870		}
871		break;
872	default:
873		error = EINVAL;
874		break;
875	}
876	return error;
877}
878
879
880static apm_devsw_installed = 0;
881
882static void
883apm_drvinit(void *unused)
884{
885	dev_t dev;
886
887	if( ! apm_devsw_installed ) {
888		dev = makedev(CDEV_MAJOR,0);
889		cdevsw_add(&dev,&apm_cdevsw,NULL);
890		apm_devsw_installed = 1;
891    	}
892}
893
894SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
895