apm.c revision 26729 
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 1.58 1997/06/15 02:19:40 wollman Exp $
19 */
20
21#include <sys/param.h>
22#include <sys/conf.h>
23#include <sys/kernel.h>
24#ifdef DEVFS
25#include <sys/devfsext.h>
26#endif /*DEVFS*/
27#include <sys/systm.h>
28#include <sys/time.h>
29#include <i386/isa/isa_device.h>
30#include <machine/apm_bios.h>
31#include <machine/segments.h>
32#include <machine/clock.h>
33#include <vm/vm.h>
34#include <vm/vm_param.h>
35#include <vm/pmap.h>
36#include <sys/syslog.h>
37#include <i386/apm/apm_setup.h>
38
39static int apm_display __P((int newstate));
40static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx));
41static void apm_resume __P((void));
42
43/* static data */
44struct apm_softc {
45	int	initialized, active;
46	int	always_halt_cpu, slow_idle_cpu;
47	int	disabled, disengaged;
48	u_int	minorversion, majorversion;
49	u_int	cs32_base, cs16_base, ds_base;
50	u_int	cs_limit, ds_limit;
51	u_int	cs_entry;
52	u_int	intversion;
53	struct apmhook sc_suspend;
54	struct apmhook sc_resume;
55#ifdef DEVFS
56	void 	*sc_devfs_token;
57#endif
58};
59
60static struct apm_softc apm_softc;
61static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
62
63#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
64
65/* Map version number to integer (keeps ordering of version numbers) */
66#define INTVERSION(major, minor)	((major)*100 + (minor))
67
68static timeout_t apm_timeout;
69static d_open_t apmopen;
70static d_close_t apmclose;
71static d_ioctl_t apmioctl;
72
73#define CDEV_MAJOR 39
74static struct cdevsw apm_cdevsw =
75	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
76	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
77	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
78
79/* setup APM GDT discriptors */
80static void
81setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
82{
83	/* setup 32bit code segment */
84	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
85	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
86
87	/* setup 16bit code segment */
88	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
89	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
90
91	/* setup data segment */
92	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
93	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
94
95	/* reflect these changes on physical GDT */
96	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
97	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
98	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
99}
100
101/* 48bit far pointer */
102struct addr48 {
103	u_long		offset;
104	u_short		segment;
105} apm_addr;
106
107static int apm_errno;
108
109int
110apm_int(u_long *eax, u_long *ebx, u_long *ecx)
111{
112	struct apm_bios_arg apa;
113	int cf;
114
115	apa.eax = *eax;
116	apa.ebx = *ebx;
117	apa.ecx = *ecx;
118	cf = apm_bios_call(&apa);
119	*eax = apa.eax;
120	*ebx = apa.ebx;
121	*ecx = apa.ecx;
122	apm_errno = ((*eax) >> 8) & 0xff;
123	return cf;
124}
125
126
127/* enable/disable power management */
128static int
129apm_enable_disable_pm(int enable)
130{
131	struct apm_softc *sc = &apm_softc;
132
133	u_long eax, ebx, ecx;
134
135	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
136
137	if (sc->intversion >= INTVERSION(1, 1))
138		ebx  = PMDV_ALLDEV;
139	else
140		ebx  = 0xffff;	/* APM version 1.0 only */
141	ecx  = enable;
142	return apm_int(&eax, &ebx, &ecx);
143}
144
145static void
146apm_driver_version(int version)
147{
148	u_long eax, ebx, ecx;
149
150	/* First try APM 1.2 */
151	eax = (APM_BIOS << 8) | APM_DRVVERSION;
152	ebx  = 0x0;
153	ecx  = version;
154	if(!apm_int(&eax, &ebx, &ecx))
155		apm_version = eax & 0xffff;
156}
157
158/* engage/disengage power management (APM 1.1 or later) */
159static int
160apm_engage_disengage_pm(int engage)
161{
162	u_long eax, ebx, ecx;
163
164	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
165	ebx = PMDV_ALLDEV;
166	ecx = engage;
167	return(apm_int(&eax, &ebx, &ecx));
168}
169
170/* get PM event */
171static u_int
172apm_getevent(void)
173{
174	u_long eax, ebx, ecx;
175
176	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
177
178	ebx = 0;
179	ecx = 0;
180	if (apm_int(&eax, &ebx, &ecx))
181		return PMEV_NOEVENT;
182
183	return ebx & 0xffff;
184}
185
186/* suspend entire system */
187static int
188apm_suspend_system(void)
189{
190	u_long eax, ebx, ecx;
191
192	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
193	ebx = PMDV_ALLDEV;
194	ecx = PMST_SUSPEND;
195
196	if (apm_int(&eax, &ebx, &ecx)) {
197		printf("Entire system suspend failure: errcode = %ld\n",
198			0xff & (eax >> 8));
199		return 1;
200	}
201	return 0;
202}
203
204/* Display control */
205/*
206 * Experimental implementation: My laptop machine can't handle this function
207 * If your laptop can control the display via APM, please inform me.
208 *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
209 */
210static int
211apm_display(int newstate)
212{
213	u_long eax, ebx, ecx;
214
215	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
216	ebx = PMDV_DISP0;
217	ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
218	if (apm_int(&eax, &ebx, &ecx)) {
219		printf("Display off failure: errcode = %ld\n",
220			0xff & (eax >> 8));
221		return 1;
222	}
223	return 0;
224}
225
226/*
227 * Turn off the entire system.
228 */
229void
230apm_power_off(void)
231{
232	u_long eax, ebx, ecx;
233
234	if (!apm_softc.active)
235		return;
236	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
237	ebx = PMDV_ALLDEV;
238	ecx = PMST_OFF;
239	apm_int(&eax, &ebx, &ecx);
240}
241
242/* APM Battery low handler */
243static void
244apm_battery_low(void)
245{
246	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
247}
248
249/* APM hook manager */
250static struct apmhook *
251apm_add_hook(struct apmhook **list, struct apmhook *ah)
252{
253	int s;
254	struct apmhook *p, *prev;
255
256#ifdef APM_DEBUG
257	printf("Add hook \"%s\"\n", ah->ah_name);
258#endif
259
260	s = splhigh();
261	if (ah == NULL)
262		panic("illegal apm_hook!");
263	prev = NULL;
264	for (p = *list; p != NULL; prev = p, p = p->ah_next)
265		if (p->ah_order > ah->ah_order)
266			break;
267
268	if (prev == NULL) {
269		ah->ah_next = *list;
270		*list = ah;
271	} else {
272		ah->ah_next = prev->ah_next;
273		prev->ah_next = ah;
274	}
275	splx(s);
276	return ah;
277}
278
279static void
280apm_del_hook(struct apmhook **list, struct apmhook *ah)
281{
282	int s;
283	struct apmhook *p, *prev;
284
285	s = splhigh();
286	prev = NULL;
287	for (p = *list; p != NULL; prev = p, p = p->ah_next)
288		if (p == ah)
289			goto deleteit;
290	panic("Tried to delete unregistered apm_hook.");
291	goto nosuchnode;
292deleteit:
293	if (prev != NULL)
294		prev->ah_next = p->ah_next;
295	else
296		*list = p->ah_next;
297nosuchnode:
298	splx(s);
299}
300
301
302/* APM driver calls some functions automatically */
303static void
304apm_execute_hook(struct apmhook *list)
305{
306	struct apmhook *p;
307
308	for (p = list; p != NULL; p = p->ah_next) {
309#ifdef APM_DEBUG
310		printf("Execute APM hook \"%s.\"\n", p->ah_name);
311#endif
312		if ((*(p->ah_fun))(p->ah_arg))
313			printf("Warning: APM hook \"%s\" failed", p->ah_name);
314	}
315}
316
317
318/* establish an apm hook */
319struct apmhook *
320apm_hook_establish(int apmh, struct apmhook *ah)
321{
322	if (apmh < 0 || apmh >= NAPM_HOOK)
323		return NULL;
324
325	return apm_add_hook(&hook[apmh], ah);
326}
327
328/* disestablish an apm hook */
329void
330apm_hook_disestablish(int apmh, struct apmhook *ah)
331{
332	if (apmh < 0 || apmh >= NAPM_HOOK)
333		return;
334
335	apm_del_hook(&hook[apmh], ah);
336}
337
338
339static struct timeval suspend_time;
340static struct timeval diff_time;
341
342static int
343apm_default_resume(void *arg)
344{
345	int pl;
346	u_int second, minute, hour;
347	struct timeval resume_time, tmp_time;
348
349	/* modified for adjkerntz */
350	pl = splsoftclock();
351	inittodr(0);			/* adjust time to RTC */
352	microtime(&resume_time);
353	tmp_time = time;		/* because 'time' is volatile */
354	timevaladd(&tmp_time, &diff_time);
355	time = tmp_time;
356	splx(pl);
357	second = resume_time.tv_sec - suspend_time.tv_sec;
358	hour = second / 3600;
359	second %= 3600;
360	minute = second / 60;
361	second %= 60;
362	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
363		hour, minute, second);
364	return 0;
365}
366
367static int
368apm_default_suspend(void *arg)
369{
370	int	pl;
371
372	pl = splsoftclock();
373	microtime(&diff_time);
374	inittodr(0);
375	microtime(&suspend_time);
376	timevalsub(&diff_time, &suspend_time);
377	splx(pl);
378	return 0;
379}
380
381static void apm_processevent(void);
382
383/*
384 * Public interface to the suspend/resume:
385 *
386 * Execute suspend and resume hook before and after sleep, respectively.
387 *
388 */
389
390void
391apm_suspend(void)
392{
393	struct apm_softc *sc = &apm_softc;
394
395	if (!sc)
396		return;
397
398	if (sc->initialized) {
399		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
400		apm_suspend_system();
401		apm_processevent();
402	}
403}
404
405void
406apm_resume(void)
407{
408	struct apm_softc *sc = &apm_softc;
409
410	if (!sc)
411		return;
412
413	if (sc->initialized)
414		apm_execute_hook(hook[APM_HOOK_RESUME]);
415}
416
417
418/* get APM information */
419static int
420apm_get_info(apm_info_t aip)
421{
422	struct apm_softc *sc = &apm_softc;
423	u_long eax, ebx, ecx;
424
425	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
426	ebx = PMDV_ALLDEV;
427	ecx = 0;
428
429	if (apm_int(&eax, &ebx, &ecx))
430		return 1;
431
432	aip->ai_acline    = (ebx >> 8) & 0xff;
433	aip->ai_batt_stat = ebx & 0xff;
434	aip->ai_batt_life = ecx & 0xff;
435	aip->ai_major     = (u_int)sc->majorversion;
436	aip->ai_minor     = (u_int)sc->minorversion;
437	aip->ai_status    = (u_int)sc->active;
438
439	return 0;
440}
441
442
443/* inform APM BIOS that CPU is idle */
444void
445apm_cpu_idle(void)
446{
447	struct apm_softc *sc = &apm_softc;
448
449	if (sc->active) {
450		u_long eax, ebx, ecx;
451
452		eax = (APM_BIOS <<8) | APM_CPUIDLE;
453		ecx = ebx = 0;
454		apm_int(&eax, &ebx, &ecx);
455	}
456	/*
457	 * Some APM implementation halts CPU in BIOS, whenever
458	 * "CPU-idle" function are invoked, but swtch() of
459	 * FreeBSD halts CPU, therefore, CPU is halted twice
460	 * in the sched loop. It makes the interrupt latency
461	 * terribly long and be able to cause a serious problem
462	 * in interrupt processing. We prevent it by removing
463	 * "hlt" operation from swtch() and managed it under
464	 * APM driver.
465	 */
466	if (!sc->active || sc->always_halt_cpu)
467		__asm("hlt");	/* wait for interrupt */
468}
469
470/* inform APM BIOS that CPU is busy */
471void
472apm_cpu_busy(void)
473{
474	struct apm_softc *sc = &apm_softc;
475
476	/*
477	 * The APM specification says this is only necessary if your BIOS
478	 * slows down the processor in the idle task, otherwise it's not
479	 * necessary.
480	 */
481	if (sc->slow_idle_cpu && sc->active) {
482		u_long eax, ebx, ecx;
483
484		eax = (APM_BIOS <<8) | APM_CPUBUSY;
485		ecx = ebx = 0;
486		apm_int(&eax, &ebx, &ecx);
487	}
488}
489
490
491/*
492 * APM timeout routine:
493 *
494 * This routine is automatically called by timer once per second.
495 */
496
497static void
498apm_timeout(void *dummy)
499{
500	struct apm_softc *sc = &apm_softc;
501
502	apm_processevent();
503	if (sc->active == 1)
504		timeout(apm_timeout, NULL, hz - 1 );  /* More than 1 Hz */
505}
506
507/* enable APM BIOS */
508static void
509apm_event_enable(void)
510{
511	struct apm_softc *sc = &apm_softc;
512
513#ifdef APM_DEBUG
514	printf("called apm_event_enable()\n");
515#endif
516	if (sc->initialized) {
517		sc->active = 1;
518		apm_timeout(sc);
519	}
520}
521
522/* disable APM BIOS */
523static void
524apm_event_disable(void)
525{
526	struct apm_softc *sc = &apm_softc;
527
528#ifdef APM_DEBUG
529	printf("called apm_event_disable()\n");
530#endif
531	if (sc->initialized) {
532		untimeout(apm_timeout, NULL);
533		sc->active = 0;
534	}
535}
536
537/* halt CPU in scheduling loop */
538static void
539apm_halt_cpu(void)
540{
541	struct apm_softc *sc = &apm_softc;
542
543	if (sc->initialized)
544		sc->always_halt_cpu = 1;
545}
546
547/* don't halt CPU in scheduling loop */
548static void
549apm_not_halt_cpu(void)
550{
551	struct apm_softc *sc = &apm_softc;
552
553	if (sc->initialized)
554		sc->always_halt_cpu = 0;
555}
556
557/* device driver definitions */
558static int apmprobe (struct isa_device *);
559static int apmattach(struct isa_device *);
560struct isa_driver apmdriver = { apmprobe, apmattach, "apm" };
561
562/*
563 * probe APM (dummy):
564 *
565 * APM probing routine is placed on locore.s and apm_init.S because
566 * this process forces the CPU to turn to real mode or V86 mode.
567 * Current version uses real mode, but in a future version, we want
568 * to use V86 mode in APM initialization.
569 */
570
571static int
572apmprobe(struct isa_device *dvp)
573{
574	bzero(&apm_softc, sizeof(apm_softc));
575
576	if ( dvp->id_unit > 0 ) {
577		printf("apm: Only one APM driver supported.\n");
578		return 0;
579	}
580	switch (apm_version) {
581	case APMINI_CANTFIND:
582		/* silent */
583		return 0;
584	case APMINI_NOT32BIT:
585		printf("apm: 32bit connection is not supported.\n");
586		return 0;
587	case APMINI_CONNECTERR:
588		printf("apm: 32-bit connection error.\n");
589		return 0;
590	}
591	if (dvp->id_flags & 0x20)
592		statclock_disable = 1;
593	return -1;
594}
595
596
597/* Process APM event */
598static void
599apm_processevent(void)
600{
601	int apm_event;
602
603#ifdef APM_DEBUG
604#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
605	printf("Received APM Event: " #symbol "\n");
606#else
607#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
608#endif
609	do {
610		apm_event = apm_getevent();
611		switch (apm_event) {
612		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
613			apm_suspend();
614			break;
615		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
616			apm_suspend();
617			break;
618		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
619			apm_suspend();
620			break;
621		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
622			apm_suspend();
623			break;
624		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
625			apm_resume();
626			break;
627		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
628			apm_resume();
629			break;
630		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
631			apm_resume();
632			break;
633		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
634			apm_battery_low();
635			apm_suspend();
636			break;
637		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
638			break;
639		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
640			inittodr(0);	/* adjust time to RTC */
641			break;
642		    case PMEV_NOEVENT:
643			break;
644		    default:
645			printf("Unknown Original APM Event 0x%x\n", apm_event);
646			    break;
647		}
648	} while (apm_event != PMEV_NOEVENT);
649}
650
651/*
652 * Attach APM:
653 *
654 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
655 */
656
657static int
658apmattach(struct isa_device *dvp)
659{
660#define APM_KERNBASE	KERNBASE
661	struct apm_softc	*sc = &apm_softc;
662
663	sc->initialized = 0;
664
665	/* Must be externally enabled */
666	sc->active = 0;
667
668	/* setup APM parameters */
669	sc->cs16_base = (apm_cs16_base << 4) + APM_KERNBASE;
670	sc->cs32_base = (apm_cs32_base << 4) + APM_KERNBASE;
671	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
672	sc->cs_limit = apm_cs_limit;
673	sc->ds_limit = apm_ds_limit;
674	sc->cs_entry = apm_cs_entry;
675
676	/* Always call HLT in idle loop */
677	sc->always_halt_cpu = 1;
678
679	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
680	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
681	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
682
683	/* print bootstrap messages */
684#ifdef APM_DEBUG
685	printf("apm: APM BIOS version %04x\n",  apm_version);
686	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
687		sc->cs32_base, sc->cs16_base, sc->ds_base);
688	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
689		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
690		is_enabled(!sc->disabled));
691	printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
692		sc->cs_limit, sc->ds_limit);
693#endif /* APM_DEBUG */
694
695#if 0
696	/* Workaround for some buggy APM BIOS implementations */
697	sc->cs_limit = 0xffff;
698	sc->ds_limit = 0xffff;
699#endif
700
701	/* setup GDT */
702	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
703			sc->cs_limit, sc->ds_limit);
704
705	/* setup entry point 48bit pointer */
706	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
707	apm_addr.offset  = sc->cs_entry;
708
709	if ((dvp->id_flags & 0x10)) {
710		if ((dvp->id_flags & 0xf) >= 0x2) {
711			apm_driver_version(0x102);
712		}
713		if (!apm_version && (dvp->id_flags & 0xf) >= 0x1) {
714			apm_driver_version(0x101);
715		}
716	} else {
717		apm_driver_version(0x102);
718		if (!apm_version)
719			apm_driver_version(0x101);
720	}
721	if (!apm_version)
722		apm_version = 0x100;
723
724	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
725			((apm_version & 0x000f) >> 0);
726	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
727			((apm_version & 0x0f00) >> 8);
728
729	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
730
731#ifdef APM_DEBUG
732	if (sc->intversion >= INTVERSION(1, 1))
733		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
734#endif
735
736	printf("apm: found APM BIOS version %d.%d\n",
737		sc->majorversion, sc->minorversion);
738
739#ifdef APM_DEBUG
740	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
741#endif
742
743	/* enable power management */
744	if (sc->disabled) {
745		if (apm_enable_disable_pm(1)) {
746#ifdef APM_DEBUG
747			printf("apm: *Warning* enable function failed! [%x]\n",
748				apm_errno);
749#endif
750		}
751	}
752
753	/* engage power managment (APM 1.1 or later) */
754	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
755		if (apm_engage_disengage_pm(1)) {
756#ifdef APM_DEBUG
757			printf("apm: *Warning* engage function failed err=[%x]",
758				apm_errno);
759			printf(" (Docked or using external power?).\n");
760#endif
761		}
762	}
763
764        /* default suspend hook */
765        sc->sc_suspend.ah_fun = apm_default_suspend;
766        sc->sc_suspend.ah_arg = sc;
767        sc->sc_suspend.ah_name = "default suspend";
768        sc->sc_suspend.ah_order = APM_MAX_ORDER;
769
770        /* default resume hook */
771        sc->sc_resume.ah_fun = apm_default_resume;
772        sc->sc_resume.ah_arg = sc;
773        sc->sc_resume.ah_name = "default resume";
774        sc->sc_resume.ah_order = APM_MIN_ORDER;
775
776        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
777        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
778
779	apm_event_enable();
780
781	sc->initialized = 1;
782
783#ifdef DEVFS
784	sc->sc_devfs_token =
785		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
786#endif
787	return 0;
788}
789
790static int
791apmopen(dev_t dev, int flag, int fmt, struct proc *p)
792{
793	struct apm_softc *sc = &apm_softc;
794
795	if (minor(dev) != 0 || !sc->initialized)
796		return (ENXIO);
797
798	return 0;
799}
800
801static int
802apmclose(dev_t dev, int flag, int fmt, struct proc *p)
803{
804	return 0;
805}
806
807static int
808apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
809{
810	struct apm_softc *sc = &apm_softc;
811	int error = 0;
812	int newstate;
813
814	if (minor(dev) != 0 || !sc->initialized)
815		return (ENXIO);
816#ifdef APM_DEBUG
817	printf("APM ioctl: cmd = 0x%x\n", cmd);
818#endif
819	switch (cmd) {
820	case APMIO_SUSPEND:
821		if ( sc->active)
822			apm_suspend();
823		else
824			error = EINVAL;
825		break;
826	case APMIO_GETINFO:
827		if (apm_get_info((apm_info_t)addr))
828			error = ENXIO;
829		break;
830	case APMIO_ENABLE:
831		apm_event_enable();
832		break;
833	case APMIO_DISABLE:
834		apm_event_disable();
835		break;
836	case APMIO_HALTCPU:
837		apm_halt_cpu();
838		break;
839	case APMIO_NOTHALTCPU:
840		apm_not_halt_cpu();
841		break;
842	case APMIO_DISPLAY:
843		newstate = *(int *)addr;
844		if (apm_display(newstate))
845			error = ENXIO;
846		break;
847	case APMIO_BIOS:
848		if (apm_bios_call((struct apm_bios_arg*)addr))
849			error = EIO;
850		break;
851	default:
852		error = EINVAL;
853		break;
854	}
855	return error;
856}
857
858
859static apm_devsw_installed = 0;
860
861static void
862apm_drvinit(void *unused)
863{
864	dev_t dev;
865
866	if( ! apm_devsw_installed ) {
867		dev = makedev(CDEV_MAJOR,0);
868		cdevsw_add(&dev,&apm_cdevsw,NULL);
869		apm_devsw_installed = 1;
870    	}
871}
872
873SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
874