apm.c revision 24407 
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 1.55 1997/03/29 11:06:37 phk 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/* APM Battery low handler */
228static void
229apm_battery_low(void)
230{
231	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
232}
233
234/* APM hook manager */
235static struct apmhook *
236apm_add_hook(struct apmhook **list, struct apmhook *ah)
237{
238	int s;
239	struct apmhook *p, *prev;
240
241#ifdef APM_DEBUG
242	printf("Add hook \"%s\"\n", ah->ah_name);
243#endif
244
245	s = splhigh();
246	if (ah == NULL)
247		panic("illegal apm_hook!");
248	prev = NULL;
249	for (p = *list; p != NULL; prev = p, p = p->ah_next)
250		if (p->ah_order > ah->ah_order)
251			break;
252
253	if (prev == NULL) {
254		ah->ah_next = *list;
255		*list = ah;
256	} else {
257		ah->ah_next = prev->ah_next;
258		prev->ah_next = ah;
259	}
260	splx(s);
261	return ah;
262}
263
264static void
265apm_del_hook(struct apmhook **list, struct apmhook *ah)
266{
267	int s;
268	struct apmhook *p, *prev;
269
270	s = splhigh();
271	prev = NULL;
272	for (p = *list; p != NULL; prev = p, p = p->ah_next)
273		if (p == ah)
274			goto deleteit;
275	panic("Tried to delete unregistered apm_hook.");
276	goto nosuchnode;
277deleteit:
278	if (prev != NULL)
279		prev->ah_next = p->ah_next;
280	else
281		*list = p->ah_next;
282nosuchnode:
283	splx(s);
284}
285
286
287/* APM driver calls some functions automatically */
288static void
289apm_execute_hook(struct apmhook *list)
290{
291	struct apmhook *p;
292
293	for (p = list; p != NULL; p = p->ah_next) {
294#ifdef APM_DEBUG
295		printf("Execute APM hook \"%s.\"\n", p->ah_name);
296#endif
297		if ((*(p->ah_fun))(p->ah_arg))
298			printf("Warning: APM hook \"%s\" failed", p->ah_name);
299	}
300}
301
302
303/* establish an apm hook */
304struct apmhook *
305apm_hook_establish(int apmh, struct apmhook *ah)
306{
307	if (apmh < 0 || apmh >= NAPM_HOOK)
308		return NULL;
309
310	return apm_add_hook(&hook[apmh], ah);
311}
312
313/* disestablish an apm hook */
314void
315apm_hook_disestablish(int apmh, struct apmhook *ah)
316{
317	if (apmh < 0 || apmh >= NAPM_HOOK)
318		return;
319
320	apm_del_hook(&hook[apmh], ah);
321}
322
323
324static struct timeval suspend_time;
325static struct timeval diff_time;
326
327static int
328apm_default_resume(void *arg)
329{
330	int pl;
331	u_int second, minute, hour;
332	struct timeval resume_time, tmp_time;
333
334	/* modified for adjkerntz */
335	pl = splsoftclock();
336	inittodr(0);			/* adjust time to RTC */
337	microtime(&resume_time);
338	tmp_time = time;		/* because 'time' is volatile */
339	timevaladd(&tmp_time, &diff_time);
340	time = tmp_time;
341	splx(pl);
342	second = resume_time.tv_sec - suspend_time.tv_sec;
343	hour = second / 3600;
344	second %= 3600;
345	minute = second / 60;
346	second %= 60;
347	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
348		hour, minute, second);
349	return 0;
350}
351
352static int
353apm_default_suspend(void *arg)
354{
355	int	pl;
356
357	pl = splsoftclock();
358	microtime(&diff_time);
359	inittodr(0);
360	microtime(&suspend_time);
361	timevalsub(&diff_time, &suspend_time);
362	splx(pl);
363	return 0;
364}
365
366static void apm_processevent(void);
367
368/*
369 * Public interface to the suspend/resume:
370 *
371 * Execute suspend and resume hook before and after sleep, respectively.
372 *
373 */
374
375void
376apm_suspend(void)
377{
378	struct apm_softc *sc = &apm_softc;
379
380	if (!sc)
381		return;
382
383	if (sc->initialized) {
384		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
385		apm_suspend_system();
386		apm_processevent();
387	}
388}
389
390void
391apm_resume(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_RESUME]);
400}
401
402
403/* get APM information */
404static int
405apm_get_info(apm_info_t aip)
406{
407	struct apm_softc *sc = &apm_softc;
408	u_long eax, ebx, ecx;
409
410	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
411	ebx = PMDV_ALLDEV;
412	ecx = 0;
413
414	if (apm_int(&eax, &ebx, &ecx))
415		return 1;
416
417	aip->ai_acline    = (ebx >> 8) & 0xff;
418	aip->ai_batt_stat = ebx & 0xff;
419	aip->ai_batt_life = ecx & 0xff;
420	aip->ai_major     = (u_int)sc->majorversion;
421	aip->ai_minor     = (u_int)sc->minorversion;
422	aip->ai_status    = (u_int)sc->active;
423
424	return 0;
425}
426
427
428/* inform APM BIOS that CPU is idle */
429void
430apm_cpu_idle(void)
431{
432	struct apm_softc *sc = &apm_softc;
433
434	if (sc->active) {
435		u_long eax, ebx, ecx;
436
437		eax = (APM_BIOS <<8) | APM_CPUIDLE;
438		ecx = ebx = 0;
439		apm_int(&eax, &ebx, &ecx);
440	}
441	/*
442	 * Some APM implementation halts CPU in BIOS, whenever
443	 * "CPU-idle" function are invoked, but swtch() of
444	 * FreeBSD halts CPU, therefore, CPU is halted twice
445	 * in the sched loop. It makes the interrupt latency
446	 * terribly long and be able to cause a serious problem
447	 * in interrupt processing. We prevent it by removing
448	 * "hlt" operation from swtch() and managed it under
449	 * APM driver.
450	 */
451	if (!sc->active || sc->always_halt_cpu)
452		__asm("hlt");	/* wait for interrupt */
453}
454
455/* inform APM BIOS that CPU is busy */
456void
457apm_cpu_busy(void)
458{
459	struct apm_softc *sc = &apm_softc;
460
461	/*
462	 * The APM specification says this is only necessary if your BIOS
463	 * slows down the processor in the idle task, otherwise it's not
464	 * necessary.
465	 */
466	if (sc->slow_idle_cpu && sc->active) {
467		u_long eax, ebx, ecx;
468
469		eax = (APM_BIOS <<8) | APM_CPUBUSY;
470		ecx = ebx = 0;
471		apm_int(&eax, &ebx, &ecx);
472	}
473}
474
475
476/*
477 * APM timeout routine:
478 *
479 * This routine is automatically called by timer once per second.
480 */
481
482static void
483apm_timeout(void *dummy)
484{
485	struct apm_softc *sc = &apm_softc;
486
487	apm_processevent();
488	if (sc->active == 1)
489		timeout(apm_timeout, NULL, hz - 1 );  /* More than 1 Hz */
490}
491
492/* enable APM BIOS */
493static void
494apm_event_enable(void)
495{
496	struct apm_softc *sc = &apm_softc;
497
498#ifdef APM_DEBUG
499	printf("called apm_event_enable()\n");
500#endif
501	if (sc->initialized) {
502		sc->active = 1;
503		apm_timeout(sc);
504	}
505}
506
507/* disable APM BIOS */
508static void
509apm_event_disable(void)
510{
511	struct apm_softc *sc = &apm_softc;
512
513#ifdef APM_DEBUG
514	printf("called apm_event_disable()\n");
515#endif
516	if (sc->initialized) {
517		untimeout(apm_timeout, NULL);
518		sc->active = 0;
519	}
520}
521
522/* halt CPU in scheduling loop */
523static void
524apm_halt_cpu(void)
525{
526	struct apm_softc *sc = &apm_softc;
527
528	if (sc->initialized)
529		sc->always_halt_cpu = 1;
530}
531
532/* don't halt CPU in scheduling loop */
533static void
534apm_not_halt_cpu(void)
535{
536	struct apm_softc *sc = &apm_softc;
537
538	if (sc->initialized)
539		sc->always_halt_cpu = 0;
540}
541
542/* device driver definitions */
543static int apmprobe (struct isa_device *);
544static int apmattach(struct isa_device *);
545struct isa_driver apmdriver = { apmprobe, apmattach, "apm" };
546
547/*
548 * probe APM (dummy):
549 *
550 * APM probing routine is placed on locore.s and apm_init.S because
551 * this process forces the CPU to turn to real mode or V86 mode.
552 * Current version uses real mode, but in a future version, we want
553 * to use V86 mode in APM initialization.
554 */
555
556static int
557apmprobe(struct isa_device *dvp)
558{
559	bzero(&apm_softc, sizeof(apm_softc));
560
561	if ( dvp->id_unit > 0 ) {
562		printf("apm: Only one APM driver supported.\n");
563		return 0;
564	}
565	switch (apm_version) {
566	case APMINI_CANTFIND:
567		/* silent */
568		return 0;
569	case APMINI_NOT32BIT:
570		printf("apm: 32bit connection is not supported.\n");
571		return 0;
572	case APMINI_CONNECTERR:
573		printf("apm: 32-bit connection error.\n");
574		return 0;
575	}
576	if (dvp->id_flags & 0x20)
577		statclock_disable = 1;
578	return -1;
579}
580
581
582/* Process APM event */
583static void
584apm_processevent(void)
585{
586	int apm_event;
587
588#ifdef APM_DEBUG
589#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
590	printf("Received APM Event: " #symbol "\n");
591#else
592#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
593#endif
594	do {
595		apm_event = apm_getevent();
596		switch (apm_event) {
597		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
598			apm_suspend();
599			break;
600		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
601			apm_suspend();
602			break;
603		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
604			apm_suspend();
605			break;
606		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
607			apm_suspend();
608			break;
609		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
610			apm_resume();
611			break;
612		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
613			apm_resume();
614			break;
615		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
616			apm_resume();
617			break;
618		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
619			apm_battery_low();
620			apm_suspend();
621			break;
622		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
623			break;
624		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
625			inittodr(0);	/* adjust time to RTC */
626			break;
627		    case PMEV_NOEVENT:
628			break;
629		    default:
630			printf("Unknown Original APM Event 0x%x\n", apm_event);
631			    break;
632		}
633	} while (apm_event != PMEV_NOEVENT);
634}
635
636/*
637 * Attach APM:
638 *
639 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
640 */
641
642static int
643apmattach(struct isa_device *dvp)
644{
645#define APM_KERNBASE	KERNBASE
646	struct apm_softc	*sc = &apm_softc;
647
648	sc->initialized = 0;
649
650	/* Must be externally enabled */
651	sc->active = 0;
652
653	/* setup APM parameters */
654	sc->cs16_base = (apm_cs16_base << 4) + APM_KERNBASE;
655	sc->cs32_base = (apm_cs32_base << 4) + APM_KERNBASE;
656	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
657	sc->cs_limit = apm_cs_limit;
658	sc->ds_limit = apm_ds_limit;
659	sc->cs_entry = apm_cs_entry;
660
661	/* Always call HLT in idle loop */
662	sc->always_halt_cpu = 1;
663
664	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
665	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
666	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
667
668	/* print bootstrap messages */
669#ifdef APM_DEBUG
670	printf("apm: APM BIOS version %04x\n",  apm_version);
671	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
672		sc->cs32_base, sc->cs16_base, sc->ds_base);
673	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
674		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
675		is_enabled(!sc->disabled));
676	printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
677		sc->cs_limit, sc->ds_limit);
678#endif /* APM_DEBUG */
679
680#if 0
681	/* Workaround for some buggy APM BIOS implementations */
682	sc->cs_limit = 0xffff;
683	sc->ds_limit = 0xffff;
684#endif
685
686	/* setup GDT */
687	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
688			sc->cs_limit, sc->ds_limit);
689
690	/* setup entry point 48bit pointer */
691	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
692	apm_addr.offset  = sc->cs_entry;
693
694	if ((dvp->id_flags & 0x10)) {
695		if ((dvp->id_flags & 0xf) >= 0x2) {
696			apm_driver_version(0x102);
697		}
698		if (!apm_version && (dvp->id_flags & 0xf) >= 0x1) {
699			apm_driver_version(0x101);
700		}
701	} else {
702		apm_driver_version(0x102);
703		if (!apm_version)
704			apm_driver_version(0x101);
705	}
706	if (!apm_version)
707		apm_version = 0x100;
708
709	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
710			((apm_version & 0x000f) >> 0);
711	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
712			((apm_version & 0x0f00) >> 8);
713
714	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
715
716#ifdef APM_DEBUG
717	if (sc->intversion >= INTVERSION(1, 1))
718		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
719#endif
720
721	printf("apm: found APM BIOS version %d.%d\n",
722		sc->majorversion, sc->minorversion);
723
724#ifdef APM_DEBUG
725	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
726#endif
727
728	/* enable power management */
729	if (sc->disabled) {
730		if (apm_enable_disable_pm(1)) {
731#ifdef APM_DEBUG
732			printf("apm: *Warning* enable function failed! [%x]\n",
733				apm_errno);
734#endif
735		}
736	}
737
738	/* engage power managment (APM 1.1 or later) */
739	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
740		if (apm_engage_disengage_pm(1)) {
741#ifdef APM_DEBUG
742			printf("apm: *Warning* engage function failed err=[%x]",
743				apm_errno);
744			printf(" (Docked or using external power?).\n");
745#endif
746		}
747	}
748
749        /* default suspend hook */
750        sc->sc_suspend.ah_fun = apm_default_suspend;
751        sc->sc_suspend.ah_arg = sc;
752        sc->sc_suspend.ah_name = "default suspend";
753        sc->sc_suspend.ah_order = APM_MAX_ORDER;
754
755        /* default resume hook */
756        sc->sc_resume.ah_fun = apm_default_resume;
757        sc->sc_resume.ah_arg = sc;
758        sc->sc_resume.ah_name = "default resume";
759        sc->sc_resume.ah_order = APM_MIN_ORDER;
760
761        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
762        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
763
764	apm_event_enable();
765
766	sc->initialized = 1;
767
768#ifdef DEVFS
769	sc->sc_devfs_token =
770		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
771#endif
772	return 0;
773}
774
775static int
776apmopen(dev_t dev, int flag, int fmt, struct proc *p)
777{
778	struct apm_softc *sc = &apm_softc;
779
780	if (minor(dev) != 0 || !sc->initialized)
781		return (ENXIO);
782
783	return 0;
784}
785
786static int
787apmclose(dev_t dev, int flag, int fmt, struct proc *p)
788{
789	return 0;
790}
791
792static int
793apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
794{
795	struct apm_softc *sc = &apm_softc;
796	int error = 0;
797	int newstate;
798
799	if (minor(dev) != 0 || !sc->initialized)
800		return (ENXIO);
801#ifdef APM_DEBUG
802	printf("APM ioctl: cmd = 0x%x\n", cmd);
803#endif
804	switch (cmd) {
805	case APMIO_SUSPEND:
806		if ( sc->active)
807			apm_suspend();
808		else
809			error = EINVAL;
810		break;
811	case APMIO_GETINFO:
812		if (apm_get_info((apm_info_t)addr))
813			error = ENXIO;
814		break;
815	case APMIO_ENABLE:
816		apm_event_enable();
817		break;
818	case APMIO_DISABLE:
819		apm_event_disable();
820		break;
821	case APMIO_HALTCPU:
822		apm_halt_cpu();
823		break;
824	case APMIO_NOTHALTCPU:
825		apm_not_halt_cpu();
826		break;
827	case APMIO_DISPLAY:
828		newstate = *(int *)addr;
829		if (apm_display(newstate))
830			error = ENXIO;
831		break;
832	case APMIO_BIOS:
833		if (apm_bios_call((struct apm_bios_arg*)addr))
834			error = EIO;
835		break;
836	default:
837		error = EINVAL;
838		break;
839	}
840	return error;
841}
842
843
844static apm_devsw_installed = 0;
845
846static void
847apm_drvinit(void *unused)
848{
849	dev_t dev;
850
851	if( ! apm_devsw_installed ) {
852		dev = makedev(CDEV_MAJOR,0);
853		cdevsw_add(&dev,&apm_cdevsw,NULL);
854		apm_devsw_installed = 1;
855    	}
856}
857
858SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
859