apm.c revision 14715 
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 1.35 1996/03/19 16:48:38 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;
56	int	always_halt_cpu, slow_idle_cpu;
57	int	disabled, disengaged;
58	u_int	minorversion, majorversion;
59	u_int	cs32_base, cs16_base, ds_base;
60	u_int	cs_limit, ds_limit;
61	u_int	cs_entry;
62	u_int	intversion;
63	struct apmhook sc_suspend;
64	struct apmhook sc_resume;
65	void 	*sc_devfs_token;
66};
67
68static struct kern_devconf kdc_apm = {
69	0, 0, 0,		/* filled in by dev_attach */
70	"apm", 0, { MDDT_ISA, 0 },
71	isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
72	&kdc_isa0,		/* parent */
73	0,			/* parentdata */
74	DC_UNCONFIGURED,	/* state */
75	"APM BIOS",
76	DC_CLS_MISC		/* class */
77};
78
79
80static struct apm_softc apm_softc;
81static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
82
83#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
84
85/* Map version number to integer (keeps ordering of version numbers) */
86#define INTVERSION(major, minor)	((major)*100 + (minor))
87
88static timeout_t apm_timeout;
89static d_open_t apmopen;
90static d_close_t apmclose;
91static d_ioctl_t apmioctl;
92
93#define CDEV_MAJOR 39
94static struct cdevsw apm_cdevsw =
95	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
96	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
97	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
98
99static void
100apm_registerdev(struct isa_device *id)
101{
102	if (kdc_apm.kdc_isa)
103		return;
104	kdc_apm.kdc_state = DC_UNCONFIGURED;
105	kdc_apm.kdc_description = "APM BIOS";
106	kdc_apm.kdc_unit = 0;
107	kdc_apm.kdc_isa = id;
108	dev_attach(&kdc_apm);
109}
110
111/* setup APM GDT discriptors */
112static void
113setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
114{
115	/* setup 32bit code segment */
116	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
117	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
118
119	/* setup 16bit code segment */
120	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
121	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
122
123	/* setup data segment */
124	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
125	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
126
127	/* reflect these changes on physical GDT */
128	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
129	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
130	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
131}
132
133/* 48bit far pointer */
134static struct addr48 {
135	u_long		offset;
136	u_short		segment;
137} apm_addr;
138
139static int apm_errno;
140
141inline
142int
143apm_int(u_long *eax, u_long *ebx, u_long *ecx)
144{
145	u_long cf;
146	__asm ("pushl	%%ebp
147		pushl	%%edx
148		pushl	%%esi
149		xorl	%3,%3
150		movl	%3,%%esi
151		lcall	_apm_addr
152		jnc	1f
153		incl	%3
154	1:
155		popl	%%esi
156		popl	%%edx
157		popl	%%ebp"
158		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
159		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
160		);
161	apm_errno = ((*eax) >> 8) & 0xff;
162	return cf;
163}
164
165
166/* enable/disable power management */
167static int
168apm_enable_disable_pm(struct apm_softc *sc, int enable)
169{
170	u_long eax, ebx, ecx;
171
172	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
173
174	if (sc->intversion >= INTVERSION(1, 1)) {
175		ebx  = PMDV_ALLDEV;
176	} else {
177		ebx  = 0xffff;	/* APM version 1.0 only */
178	}
179	ecx  = enable;
180	return apm_int(&eax, &ebx, &ecx);
181}
182
183/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
184static void
185apm_driver_version(void)
186{
187	u_long eax, ebx, ecx;
188
189#ifdef APM_DEBUG
190	eax = (APM_BIOS<<8) | APM_INSTCHECK;
191	ebx  = 0x0;
192	ecx  = 0x0101;
193	i = apm_int(&eax, &ebx, &ecx);
194	printf("[%04lx %04lx %04lx %ld %02x]\n",
195		eax, ebx, ecx, i, apm_errno);
196#endif
197
198	eax = (APM_BIOS << 8) | APM_DRVVERSION;
199	ebx  = 0x0;
200	ecx  = 0x0101;
201	if(!apm_int(&eax, &ebx, &ecx))
202		apm_version = eax & 0xffff;
203
204#ifdef APM_DEBUG
205	eax = (APM_BIOS << 8) | APM_INSTCHECK;
206	ebx  = 0x0;
207	ecx  = 0x0101;
208	i = apm_int(&eax, &ebx, &ecx);
209	printf("[%04lx %04lx %04lx %ld %02x]\n",
210		eax, ebx, ecx, i, apm_errno);
211#endif
212}
213
214/* engage/disengage power management (APM 1.1 or later) */
215static int
216apm_engage_disengage_pm(struct apm_softc *sc, int engage)
217{
218	u_long eax, ebx, ecx, i;
219
220	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
221	ebx = PMDV_ALLDEV;
222	ecx = engage;
223	i = apm_int(&eax, &ebx, &ecx);
224	return i;
225}
226
227/* get PM event */
228static u_int
229apm_getevent(struct apm_softc *sc)
230{
231	u_long eax, ebx, ecx;
232
233	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
234
235	ebx = 0;
236	ecx = 0;
237	if (apm_int(&eax, &ebx, &ecx))
238		return PMEV_NOEVENT;
239
240	return ebx & 0xffff;
241}
242
243/* suspend entire system */
244static int
245apm_suspend_system(struct apm_softc *sc)
246{
247	u_long eax, ebx, ecx;
248
249	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
250	ebx = PMDV_ALLDEV;
251	ecx = PMST_SUSPEND;
252
253	__asm("cli");
254	if (apm_int(&eax, &ebx, &ecx)) {
255		__asm("sti");
256		printf("Entire system suspend failure: errcode = %ld\n",
257			0xff & (eax >> 8));
258		return 1;
259	}
260	__asm("sti");
261	return 0;
262}
263
264/* Display control */
265/*
266 * Experimental implementation: My laptop machine can't handle this function
267 * If your laptop can control the display via APM, please inform me.
268 *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
269 */
270static int
271apm_display_off(void)
272{
273	u_long eax, ebx, ecx;
274
275	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
276	ebx = PMDV_2NDSTORAGE0;
277	ecx = PMST_STANDBY;
278	if (apm_int(&eax, &ebx, &ecx)) {
279		printf("Display off failure: errcode = %ld\n",
280			0xff & (eax >> 8));
281		return 1;
282	}
283
284	return 0;
285}
286
287/* APM Battery low handler */
288static void
289apm_battery_low(struct apm_softc *sc)
290{
291	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
292}
293
294/* APM hook manager */
295static struct apmhook *
296apm_add_hook(struct apmhook **list, struct apmhook *ah)
297{
298	int s;
299	struct apmhook *p, *prev;
300
301#if 0
302	printf("Add hook \"%s\"\n", ah->ah_name);
303#endif
304
305	s = splhigh();
306	if (ah == NULL) {
307		panic("illegal apm_hook!");
308	}
309	prev = NULL;
310	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
311		if (p->ah_order > ah->ah_order) {
312			break;
313		}
314	}
315
316	if (prev == NULL) {
317		ah->ah_next = *list;
318		*list = ah;
319	} else {
320		ah->ah_next = prev->ah_next;
321		prev->ah_next = ah;
322	}
323	splx(s);
324	return ah;
325}
326
327static void
328apm_del_hook(struct apmhook **list, struct apmhook *ah)
329{
330	int s;
331	struct apmhook *p, *prev;
332
333	s = splhigh();
334	prev = NULL;
335	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
336		if (p == ah) {
337			goto deleteit;
338		}
339	}
340	panic("Tried to delete unregistered apm_hook.");
341	goto nosuchnode;
342deleteit:
343	if (prev != NULL) {
344		prev->ah_next = p->ah_next;
345	} else {
346		*list = p->ah_next;
347	}
348nosuchnode:
349	splx(s);
350}
351
352
353/* APM driver calls some functions automatically */
354static void
355apm_execute_hook(struct apmhook *list)
356{
357	struct apmhook *p;
358
359	for (p = list; p != NULL; p = p->ah_next) {
360#if 0
361		printf("Execute APM hook \"%s.\"\n", p->ah_name);
362#endif
363		if ((*(p->ah_fun))(p->ah_arg)) {
364			printf("Warning: APM hook \"%s\" failed", p->ah_name);
365		}
366	}
367}
368
369
370/* establish an apm hook */
371struct apmhook *
372apm_hook_establish(int apmh, struct apmhook *ah)
373{
374	if (apmh < 0 || apmh >= NAPM_HOOK)
375		return NULL;
376
377	return apm_add_hook(&hook[apmh], ah);
378}
379
380#ifdef notused
381/* disestablish an apm hook */
382void
383apm_hook_disestablish(int apmh, struct apmhook *ah)
384{
385	if (apmh < 0 || apmh >= NAPM_HOOK)
386		return;
387
388	apm_del_hook(&hook[apmh], ah);
389}
390#endif /* notused */
391
392
393static struct timeval suspend_time;
394static struct timeval diff_time;
395
396static int
397apm_default_resume(void *arg)
398{
399	int pl;
400	u_int second, minute, hour;
401	struct timeval resume_time, tmp_time;
402
403	/* modified for adjkerntz */
404	pl = splsoftclock();
405	inittodr(0);			/* adjust time to RTC */
406	microtime(&resume_time);
407	tmp_time = time;		/* because 'time' is volatile */
408	timevaladd(&tmp_time, &diff_time);
409	time = tmp_time;
410	splx(pl);
411	second = resume_time.tv_sec - suspend_time.tv_sec;
412	hour = second / 3600;
413	second %= 3600;
414	minute = second / 60;
415	second %= 60;
416	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
417		hour, minute, second);
418	return 0;
419}
420
421static int
422apm_default_suspend(void *arg)
423{
424	int	pl;
425
426	pl = splsoftclock();
427	microtime(&diff_time);
428	inittodr(0);
429	microtime(&suspend_time);
430	timevalsub(&diff_time, &suspend_time);
431	splx(pl);
432	return 0;
433}
434
435static void apm_processevent(struct apm_softc *);
436
437/*
438 * Public interface to the suspend/resume:
439 *
440 * Execute suspend and resume hook before and after sleep, respectively.
441 *
442 */
443
444void
445apm_suspend(void)
446{
447	struct apm_softc *sc = &apm_softc;
448
449	if (!sc)
450		return;
451
452	if (sc->initialized) {
453		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
454		apm_suspend_system(sc);
455		apm_processevent(sc);
456	}
457}
458
459void
460apm_resume(void)
461{
462	struct apm_softc *sc = &apm_softc;
463
464	if (!sc)
465		return;
466
467	if (sc->initialized) {
468		apm_execute_hook(hook[APM_HOOK_RESUME]);
469	}
470}
471
472
473/* get APM information */
474static int
475apm_get_info(struct apm_softc *sc, apm_info_t aip)
476{
477	u_long eax, ebx, ecx;
478
479	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
480	ebx = PMDV_ALLDEV;
481	ecx = 0;
482
483	if (apm_int(&eax, &ebx, &ecx))
484		return 1;
485
486	aip->ai_acline    = (ebx >> 8) & 0xff;
487	aip->ai_batt_stat = ebx & 0xff;
488	aip->ai_batt_life = ecx & 0xff;
489	aip->ai_major     = (u_int)sc->majorversion;
490	aip->ai_minor     = (u_int)sc->minorversion;
491	aip->ai_status    = (u_int)sc->active;
492
493	return 0;
494}
495
496
497/* inform APM BIOS that CPU is idle */
498void
499apm_cpu_idle(void)
500{
501	struct apm_softc *sc = &apm_softc;
502
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	 * Some APM implementation halts CPU in BIOS, whenever
512	 * "CPU-idle" function are invoked, but swtch() of
513	 * FreeBSD halts CPU, therefore, CPU is halted twice
514	 * in the sched loop. It makes the interrupt latency
515	 * terribly long and be able to cause a serious problem
516	 * in interrupt processing. We prevent it by removing
517	 * "hlt" operation from swtch() and managed it under
518	 * APM driver.
519	 */
520	if (!sc->active || sc->always_halt_cpu) {
521		__asm("hlt");	/* wait for interrupt */
522	}
523}
524
525/* inform APM BIOS that CPU is busy */
526void
527apm_cpu_busy(void)
528{
529	struct apm_softc *sc = &apm_softc;
530
531	/*
532	 * The APM specification says this is only necessary if your BIOS
533	 * slows down the processor in the idle task, otherwise it's not
534	 * necessary.
535	 */
536	if (sc->slow_idle_cpu && sc->active) {
537		u_long eax, ebx, ecx;
538
539		eax = (APM_BIOS <<8) | APM_CPUBUSY;
540		ecx = ebx = 0;
541		apm_int(&eax, &ebx, &ecx);
542	}
543}
544
545
546/*
547 * APM timeout routine:
548 *
549 * This routine is automatically called by timer once per second.
550 */
551
552static void
553apm_timeout(void *arg)
554{
555	struct apm_softc *sc = arg;
556
557	apm_processevent(sc);
558	if (sc->active == 1) {
559		timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
560	}
561}
562
563/* enable APM BIOS */
564static void
565apm_event_enable(struct apm_softc *sc)
566{
567#ifdef APM_DEBUG
568	printf("called apm_event_enable()\n");
569#endif
570	if (sc->initialized) {
571		sc->active = 1;
572		apm_timeout(sc);
573	}
574}
575
576/* disable APM BIOS */
577static void
578apm_event_disable(struct apm_softc *sc)
579{
580#ifdef APM_DEBUG
581	printf("called apm_event_disable()\n");
582#endif
583	if (sc->initialized) {
584		untimeout(apm_timeout, NULL);
585		sc->active = 0;
586	}
587}
588
589/* halt CPU in scheduling loop */
590static void
591apm_halt_cpu(struct apm_softc *sc)
592{
593	if (sc->initialized) {
594		sc->always_halt_cpu = 1;
595	}
596}
597
598/* don't halt CPU in scheduling loop */
599static void
600apm_not_halt_cpu(struct apm_softc *sc)
601{
602	if (sc->initialized) {
603		sc->always_halt_cpu = 0;
604	}
605}
606
607/* device driver definitions */
608static int apmprobe (struct isa_device *);
609static int apmattach(struct isa_device *);
610struct isa_driver apmdriver = {
611	apmprobe, apmattach, "apm" };
612
613/*
614 * probe APM (dummy):
615 *
616 * APM probing routine is placed on locore.s and apm_init.S because
617 * this process forces the CPU to turn to real mode or V86 mode.
618 * Current version uses real mode, but on future version, we want
619 * to use V86 mode in APM initialization.
620 */
621
622static int
623apmprobe(struct isa_device *dvp)
624{
625	if ( dvp->id_unit > 0 ) {
626		printf("apm: Only one APM driver supported.\n");
627		return 0;
628	}
629	apm_registerdev(dvp);
630	switch (apm_version) {
631	case APMINI_CANTFIND:
632		/* silent */
633		return 0;
634	case APMINI_NOT32BIT:
635		printf("apm: 32bit connection is not supported.\n");
636		return 0;
637	case APMINI_CONNECTERR:
638		printf("apm: 32-bit connection error.\n");
639		return 0;
640	}
641
642	return -1;
643}
644
645
646/* Process APM event */
647static void
648apm_processevent(struct apm_softc *sc)
649{
650	int apm_event;
651
652#ifdef APM_DEBUG
653#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
654	printf("Original APM Event: " #symbol "\n");
655#else
656#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
657#endif
658	while (1) {
659		apm_event = apm_getevent(sc);
660		if (apm_event == PMEV_NOEVENT)
661			break;
662		switch (apm_event) {
663		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
664			apm_suspend();
665			break;
666		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
667			apm_suspend();
668			break;
669		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
670			apm_suspend();
671			break;
672		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
673			apm_suspend();
674			break;
675		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
676			apm_resume();
677			break;
678		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
679			apm_resume();
680			break;
681		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
682			apm_resume();
683			break;
684		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
685			apm_battery_low(sc);
686			apm_suspend();
687			break;
688
689		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
690			break;
691
692		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
693			inittodr(0);	/* adjust time to RTC */
694			break;
695
696		    default:
697			printf("Unknown Original APM Event 0x%x\n", apm_event);
698			    break;
699		}
700	}
701}
702
703/*
704 * Attach APM:
705 *
706 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
707 */
708
709static int
710apmattach(struct isa_device *dvp)
711{
712#define APM_KERNBASE	KERNBASE
713	struct apm_softc	*sc = &apm_softc;
714
715	sc->initialized = 0;
716
717	/* Must be externally enabled */
718	sc->active = 0;
719
720	/* setup APM parameters */
721	sc->cs16_base = (apm_cs32_base << 4) + APM_KERNBASE;
722	sc->cs32_base = (apm_cs16_base << 4) + APM_KERNBASE;
723	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
724	sc->cs_limit = apm_cs_limit;
725	sc->ds_limit = apm_ds_limit;
726	sc->cs_entry = apm_cs_entry;
727
728	/* Always call HLT in idle loop */
729	sc->always_halt_cpu = 1;
730
731	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
732	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
733	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
734
735	/* print bootstrap messages */
736#ifdef APM_DEBUG
737	printf(" found APM BIOS version %04x\n",  apm_version);
738	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
739		sc->cs32_base, sc->cs16_base, sc->ds_base);
740	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
741		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
742		is_enabled(!sc->disabled));
743	printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
744#endif /* APM_DEBUG */
745
746	/* Workaround for some buggy APM BIOS implementations */
747	sc->cs_limit = 0xffff;
748	sc->ds_limit = 0xffff;
749
750	/* setup GDT */
751	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
752			sc->cs_limit, sc->ds_limit);
753
754	/* setup entry point 48bit pointer */
755	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
756	apm_addr.offset  = sc->cs_entry;
757
758	/* Try to kick bios into 1.1 mode */
759	apm_driver_version();
760	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
761			((apm_version & 0x000f) >> 0);
762	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
763			((apm_version & 0x0f00) >> 8);
764
765	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
766
767	if (sc->intversion >= INTVERSION(1, 1)) {
768		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
769	}
770
771	printf(" found APM BIOS version %d.%d\n",
772		sc->majorversion, sc->minorversion);
773	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
774
775	/* enable power management */
776	if (sc->disabled) {
777		if (apm_enable_disable_pm(sc, 1)) {
778			printf("Warning: APM enable function failed! [%x]\n",
779				apm_errno);
780		}
781	}
782
783	/* engage power managment (APM 1.1 or later) */
784	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
785		if (apm_engage_disengage_pm(sc, 1)) {
786			printf("Warning: APM engage function failed [%x]\n",
787				apm_errno);
788		}
789	}
790
791        /* default suspend hook */
792        sc->sc_suspend.ah_fun = apm_default_suspend;
793        sc->sc_suspend.ah_arg = sc;
794        sc->sc_suspend.ah_name = "default suspend";
795        sc->sc_suspend.ah_order = APM_MAX_ORDER;
796
797        /* default resume hook */
798        sc->sc_resume.ah_fun = apm_default_resume;
799        sc->sc_resume.ah_arg = sc;
800        sc->sc_resume.ah_name = "default resume";
801        sc->sc_resume.ah_order = APM_MIN_ORDER;
802
803        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
804        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
805
806	apm_event_enable(sc);
807	kdc_apm.kdc_state = DC_IDLE;
808
809	sc->initialized = 1;
810
811#ifdef DEVFS
812	sc->sc_devfs_token = devfs_add_devsw(
813		"/",	"apm",	&apm_cdevsw,	0,	DV_CHR,	0,  0, 0600);
814#endif
815	return 0;
816}
817
818static int
819apmopen(dev_t dev, int flag, int fmt, struct proc *p)
820{
821	struct apm_softc *sc = &apm_softc;
822
823	if (minor(dev) != 0 || !sc->initialized)
824		return (ENXIO);
825
826	return 0;
827}
828
829static int
830apmclose(dev_t dev, int flag, int fmt, struct proc *p)
831{
832	return 0;
833}
834
835static int
836apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
837{
838	struct apm_softc *sc = &apm_softc;
839	int error = 0;
840
841	if (minor(dev) != 0 || !sc->initialized)
842		return (ENXIO);
843#ifdef APM_DEBUG
844	printf("APM ioctl: cmd = 0x%x\n", cmd);
845#endif
846	switch (cmd) {
847	case APMIO_SUSPEND:
848		if ( sc->active) {
849			apm_suspend();
850		} else {
851			error = EINVAL;
852		}
853		break;
854	case APMIO_GETINFO:
855		if (apm_get_info(sc, (apm_info_t)addr)) {
856			error = ENXIO;
857		}
858		break;
859	case APMIO_ENABLE:
860		kdc_apm.kdc_state = DC_BUSY;
861		apm_event_enable(sc);
862		break;
863	case APMIO_DISABLE:
864		kdc_apm.kdc_state = DC_IDLE;
865		apm_event_disable(sc);
866		break;
867	case APMIO_HALTCPU:
868		apm_halt_cpu(sc);
869		break;
870	case APMIO_NOTHALTCPU:
871		apm_not_halt_cpu(sc);
872		break;
873	case APMIO_DISPLAYOFF:
874		if (apm_display_off()) {
875			error = ENXIO;
876		}
877		break;
878	default:
879		error = EINVAL;
880		break;
881	}
882	return error;
883}
884
885
886static apm_devsw_installed = 0;
887
888static void
889apm_drvinit(void *unused)
890{
891	dev_t dev;
892
893	if( ! apm_devsw_installed ) {
894		dev = makedev(CDEV_MAJOR,0);
895		cdevsw_add(&dev,&apm_cdevsw,NULL);
896		apm_devsw_installed = 1;
897    	}
898}
899
900SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
901