apm.c revision 30935 
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 1.62 1997/10/23 04:18:49 nate 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 struct callout_handle apm_timeout_ch =
69    CALLOUT_HANDLE_INITIALIZER(&apm_timeout_ch);
70
71static timeout_t apm_timeout;
72static d_open_t apmopen;
73static d_close_t apmclose;
74static d_ioctl_t apmioctl;
75
76#define CDEV_MAJOR 39
77static struct cdevsw apm_cdevsw =
78	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
79	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
80	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
81
82/* setup APM GDT discriptors */
83static void
84setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
85{
86	/* setup 32bit code segment */
87	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
88	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
89
90	/* setup 16bit code segment */
91	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
92	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
93
94	/* setup data segment */
95	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
96	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
97
98	/* reflect these changes on physical GDT */
99	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
100	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
101	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
102}
103
104/* 48bit far pointer */
105struct addr48 {
106	u_long		offset;
107	u_short		segment;
108} apm_addr;
109
110static int apm_errno;
111
112int
113apm_int(u_long *eax, u_long *ebx, u_long *ecx)
114{
115	struct apm_bios_arg apa;
116	int cf;
117
118	apa.eax = *eax;
119	apa.ebx = *ebx;
120	apa.ecx = *ecx;
121	cf = apm_bios_call(&apa);
122	*eax = apa.eax;
123	*ebx = apa.ebx;
124	*ecx = apa.ecx;
125	apm_errno = ((*eax) >> 8) & 0xff;
126	return cf;
127}
128
129
130/* enable/disable power management */
131static int
132apm_enable_disable_pm(int enable)
133{
134	struct apm_softc *sc = &apm_softc;
135
136	u_long eax, ebx, ecx;
137
138	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
139
140	if (sc->intversion >= INTVERSION(1, 1))
141		ebx  = PMDV_ALLDEV;
142	else
143		ebx  = 0xffff;	/* APM version 1.0 only */
144	ecx  = enable;
145	return apm_int(&eax, &ebx, &ecx);
146}
147
148static void
149apm_driver_version(int version)
150{
151	u_long eax, ebx, ecx;
152
153	/* First try APM 1.2 */
154	eax = (APM_BIOS << 8) | APM_DRVVERSION;
155	ebx  = 0x0;
156	ecx  = version;
157	if(!apm_int(&eax, &ebx, &ecx))
158		apm_version = eax & 0xffff;
159}
160
161/* engage/disengage power management (APM 1.1 or later) */
162static int
163apm_engage_disengage_pm(int engage)
164{
165	u_long eax, ebx, ecx;
166
167	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
168	ebx = PMDV_ALLDEV;
169	ecx = engage;
170	return(apm_int(&eax, &ebx, &ecx));
171}
172
173/* get PM event */
174static u_int
175apm_getevent(void)
176{
177	u_long eax, ebx, ecx;
178
179	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
180
181	ebx = 0;
182	ecx = 0;
183	if (apm_int(&eax, &ebx, &ecx))
184		return PMEV_NOEVENT;
185
186	return ebx & 0xffff;
187}
188
189/* suspend entire system */
190static int
191apm_suspend_system(void)
192{
193	u_long eax, ebx, ecx;
194
195	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
196	ebx = PMDV_ALLDEV;
197	ecx = PMST_SUSPEND;
198
199	if (apm_int(&eax, &ebx, &ecx)) {
200		printf("Entire system suspend failure: errcode = %ld\n",
201			0xff & (eax >> 8));
202		return 1;
203	}
204	return 0;
205}
206
207/* Display control */
208/*
209 * Experimental implementation: My laptop machine can't handle this function
210 * If your laptop can control the display via APM, please inform me.
211 *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
212 */
213static int
214apm_display(int newstate)
215{
216	u_long eax, ebx, ecx;
217
218	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
219	ebx = PMDV_DISP0;
220	ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
221	if (apm_int(&eax, &ebx, &ecx)) {
222		printf("Display off failure: errcode = %ld\n",
223			0xff & (eax >> 8));
224		return 1;
225	}
226	return 0;
227}
228
229/*
230 * Turn off the entire system.
231 */
232void
233apm_power_off(void)
234{
235	u_long eax, ebx, ecx;
236
237	if (!apm_softc.active)
238		return;
239	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
240	ebx = PMDV_ALLDEV;
241	ecx = PMST_OFF;
242	apm_int(&eax, &ebx, &ecx);
243}
244
245/* APM Battery low handler */
246static void
247apm_battery_low(void)
248{
249	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
250}
251
252/* APM hook manager */
253static struct apmhook *
254apm_add_hook(struct apmhook **list, struct apmhook *ah)
255{
256	int s;
257	struct apmhook *p, *prev;
258
259#ifdef APM_DEBUG
260	printf("Add hook \"%s\"\n", ah->ah_name);
261#endif
262
263	s = splhigh();
264	if (ah == NULL)
265		panic("illegal apm_hook!");
266	prev = NULL;
267	for (p = *list; p != NULL; prev = p, p = p->ah_next)
268		if (p->ah_order > ah->ah_order)
269			break;
270
271	if (prev == NULL) {
272		ah->ah_next = *list;
273		*list = ah;
274	} else {
275		ah->ah_next = prev->ah_next;
276		prev->ah_next = ah;
277	}
278	splx(s);
279	return ah;
280}
281
282static void
283apm_del_hook(struct apmhook **list, struct apmhook *ah)
284{
285	int s;
286	struct apmhook *p, *prev;
287
288	s = splhigh();
289	prev = NULL;
290	for (p = *list; p != NULL; prev = p, p = p->ah_next)
291		if (p == ah)
292			goto deleteit;
293	panic("Tried to delete unregistered apm_hook.");
294	goto nosuchnode;
295deleteit:
296	if (prev != NULL)
297		prev->ah_next = p->ah_next;
298	else
299		*list = p->ah_next;
300nosuchnode:
301	splx(s);
302}
303
304
305/* APM driver calls some functions automatically */
306static void
307apm_execute_hook(struct apmhook *list)
308{
309	struct apmhook *p;
310
311	for (p = list; p != NULL; p = p->ah_next) {
312#ifdef APM_DEBUG
313		printf("Execute APM hook \"%s.\"\n", p->ah_name);
314#endif
315		if ((*(p->ah_fun))(p->ah_arg))
316			printf("Warning: APM hook \"%s\" failed", p->ah_name);
317	}
318}
319
320
321/* establish an apm hook */
322struct apmhook *
323apm_hook_establish(int apmh, struct apmhook *ah)
324{
325	if (apmh < 0 || apmh >= NAPM_HOOK)
326		return NULL;
327
328	return apm_add_hook(&hook[apmh], ah);
329}
330
331/* disestablish an apm hook */
332void
333apm_hook_disestablish(int apmh, struct apmhook *ah)
334{
335	if (apmh < 0 || apmh >= NAPM_HOOK)
336		return;
337
338	apm_del_hook(&hook[apmh], ah);
339}
340
341
342static struct timeval suspend_time;
343static struct timeval diff_time;
344
345static int
346apm_default_resume(void *arg)
347{
348	int pl;
349	u_int second, minute, hour;
350	struct timeval resume_time, tmp_time;
351
352	/* modified for adjkerntz */
353	pl = splsoftclock();
354	inittodr(0);			/* adjust time to RTC */
355	microtime(&resume_time);
356	tmp_time = time;		/* because 'time' is volatile */
357	timevaladd(&tmp_time, &diff_time);
358	time = tmp_time;
359	splx(pl);
360	second = resume_time.tv_sec - suspend_time.tv_sec;
361	hour = second / 3600;
362	second %= 3600;
363	minute = second / 60;
364	second %= 60;
365	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
366		hour, minute, second);
367	return 0;
368}
369
370static int
371apm_default_suspend(void *arg)
372{
373	int	pl;
374
375	pl = splsoftclock();
376	microtime(&diff_time);
377	inittodr(0);
378	microtime(&suspend_time);
379	timevalsub(&diff_time, &suspend_time);
380	splx(pl);
381	return 0;
382}
383
384static void apm_processevent(void);
385
386/*
387 * Public interface to the suspend/resume:
388 *
389 * Execute suspend and resume hook before and after sleep, respectively.
390 *
391 */
392
393void
394apm_suspend(void)
395{
396	struct apm_softc *sc = &apm_softc;
397
398	if (!sc)
399		return;
400
401	if (sc->initialized) {
402		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
403		if (apm_suspend_system() == 0)
404			apm_processevent();
405		else
406			// Failure, 'resume' the system again
407			apm_execute_hook(hook[APM_HOOK_RESUME]);
408	}
409}
410
411void
412apm_resume(void)
413{
414	struct apm_softc *sc = &apm_softc;
415
416	if (!sc)
417		return;
418
419	if (sc->initialized)
420		apm_execute_hook(hook[APM_HOOK_RESUME]);
421}
422
423
424/* get APM information */
425static int
426apm_get_info(apm_info_t aip)
427{
428	struct apm_softc *sc = &apm_softc;
429	u_long eax, ebx, ecx;
430
431	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
432	ebx = PMDV_ALLDEV;
433	ecx = 0;
434
435	if (apm_int(&eax, &ebx, &ecx))
436		return 1;
437
438	aip->ai_acline    = (ebx >> 8) & 0xff;
439	aip->ai_batt_stat = ebx & 0xff;
440	aip->ai_batt_life = ecx & 0xff;
441	aip->ai_major     = (u_int)sc->majorversion;
442	aip->ai_minor     = (u_int)sc->minorversion;
443	aip->ai_status    = (u_int)sc->active;
444
445	return 0;
446}
447
448
449/* inform APM BIOS that CPU is idle */
450void
451apm_cpu_idle(void)
452{
453	struct apm_softc *sc = &apm_softc;
454
455	if (sc->active) {
456		u_long eax, ebx, ecx;
457
458		eax = (APM_BIOS <<8) | APM_CPUIDLE;
459		ecx = ebx = 0;
460		apm_int(&eax, &ebx, &ecx);
461	}
462	/*
463	 * Some APM implementation halts CPU in BIOS, whenever
464	 * "CPU-idle" function are invoked, but swtch() of
465	 * FreeBSD halts CPU, therefore, CPU is halted twice
466	 * in the sched loop. It makes the interrupt latency
467	 * terribly long and be able to cause a serious problem
468	 * in interrupt processing. We prevent it by removing
469	 * "hlt" operation from swtch() and managed it under
470	 * APM driver.
471	 */
472	if (!sc->active || sc->always_halt_cpu)
473		__asm("hlt");	/* wait for interrupt */
474}
475
476/* inform APM BIOS that CPU is busy */
477void
478apm_cpu_busy(void)
479{
480	struct apm_softc *sc = &apm_softc;
481
482	/*
483	 * The APM specification says this is only necessary if your BIOS
484	 * slows down the processor in the idle task, otherwise it's not
485	 * necessary.
486	 */
487	if (sc->slow_idle_cpu && sc->active) {
488		u_long eax, ebx, ecx;
489
490		eax = (APM_BIOS <<8) | APM_CPUBUSY;
491		ecx = ebx = 0;
492		apm_int(&eax, &ebx, &ecx);
493	}
494}
495
496
497/*
498 * APM timeout routine:
499 *
500 * This routine is automatically called by timer once per second.
501 */
502
503static void
504apm_timeout(void *dummy)
505{
506	struct apm_softc *sc = &apm_softc;
507
508	apm_processevent();
509	if (sc->active == 1)
510		/* Run slightly more oftan than 1 Hz */
511		apm_timeout_ch = timeout(apm_timeout, NULL, hz - 1 );
512}
513
514/* enable APM BIOS */
515static void
516apm_event_enable(void)
517{
518	struct apm_softc *sc = &apm_softc;
519
520#ifdef APM_DEBUG
521	printf("called apm_event_enable()\n");
522#endif
523	if (sc->initialized) {
524		sc->active = 1;
525		apm_timeout(sc);
526	}
527}
528
529/* disable APM BIOS */
530static void
531apm_event_disable(void)
532{
533	struct apm_softc *sc = &apm_softc;
534
535#ifdef APM_DEBUG
536	printf("called apm_event_disable()\n");
537#endif
538	if (sc->initialized) {
539		untimeout(apm_timeout, NULL, apm_timeout_ch);
540		sc->active = 0;
541	}
542}
543
544/* halt CPU in scheduling loop */
545static void
546apm_halt_cpu(void)
547{
548	struct apm_softc *sc = &apm_softc;
549
550	if (sc->initialized)
551		sc->always_halt_cpu = 1;
552}
553
554/* don't halt CPU in scheduling loop */
555static void
556apm_not_halt_cpu(void)
557{
558	struct apm_softc *sc = &apm_softc;
559
560	if (sc->initialized)
561		sc->always_halt_cpu = 0;
562}
563
564/* device driver definitions */
565static int apmprobe (struct isa_device *);
566static int apmattach(struct isa_device *);
567struct isa_driver apmdriver = { apmprobe, apmattach, "apm" };
568
569/*
570 * probe APM (dummy):
571 *
572 * APM probing routine is placed on locore.s and apm_init.S because
573 * this process forces the CPU to turn to real mode or V86 mode.
574 * Current version uses real mode, but in a future version, we want
575 * to use V86 mode in APM initialization.
576 */
577
578static int
579apmprobe(struct isa_device *dvp)
580{
581	bzero(&apm_softc, sizeof(apm_softc));
582
583	if ( dvp->id_unit > 0 ) {
584		printf("apm: Only one APM driver supported.\n");
585		return 0;
586	}
587	switch (apm_version) {
588	case APMINI_CANTFIND:
589		/* silent */
590		return 0;
591	case APMINI_NOT32BIT:
592		printf("apm: 32bit connection is not supported.\n");
593		return 0;
594	case APMINI_CONNECTERR:
595		printf("apm: 32-bit connection error.\n");
596		return 0;
597	}
598	if (dvp->id_flags & 0x20)
599		statclock_disable = 1;
600	return -1;
601}
602
603
604/* Process APM event */
605static void
606apm_processevent(void)
607{
608	int apm_event;
609
610#ifdef APM_DEBUG
611#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
612	printf("Received APM Event: " #symbol "\n");
613#else
614#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
615#endif
616	do {
617		apm_event = apm_getevent();
618		switch (apm_event) {
619		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
620			apm_suspend();
621			break;
622		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
623			apm_suspend();
624			break;
625		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
626			apm_suspend();
627			break;
628		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
629			apm_suspend();
630			break;
631		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
632			apm_resume();
633			break;
634		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
635			apm_resume();
636			break;
637		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
638			apm_resume();
639			break;
640		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
641			apm_battery_low();
642			apm_suspend();
643			break;
644		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
645			break;
646		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
647			inittodr(0);	/* adjust time to RTC */
648			break;
649		    case PMEV_NOEVENT:
650			break;
651		    default:
652			printf("Unknown Original APM Event 0x%x\n", apm_event);
653			    break;
654		}
655	} while (apm_event != PMEV_NOEVENT);
656}
657
658/*
659 * Attach APM:
660 *
661 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
662 */
663
664static int
665apmattach(struct isa_device *dvp)
666{
667#define APM_KERNBASE	KERNBASE
668	struct apm_softc	*sc = &apm_softc;
669
670	sc->initialized = 0;
671
672	/* Must be externally enabled */
673	sc->active = 0;
674
675	/* setup APM parameters */
676	sc->cs16_base = (apm_cs16_base << 4) + APM_KERNBASE;
677	sc->cs32_base = (apm_cs32_base << 4) + APM_KERNBASE;
678	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
679	sc->cs_limit = apm_cs_limit;
680	sc->ds_limit = apm_ds_limit;
681	sc->cs_entry = apm_cs_entry;
682
683	/* Always call HLT in idle loop */
684	sc->always_halt_cpu = 1;
685
686	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
687	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
688	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
689
690	/* print bootstrap messages */
691#ifdef APM_DEBUG
692	printf("apm: APM BIOS version %04x\n",  apm_version);
693	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
694		sc->cs32_base, sc->cs16_base, sc->ds_base);
695	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
696		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
697		is_enabled(!sc->disabled));
698	printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
699		sc->cs_limit, sc->ds_limit);
700#endif /* APM_DEBUG */
701
702#if 0
703	/* Workaround for some buggy APM BIOS implementations */
704	sc->cs_limit = 0xffff;
705	sc->ds_limit = 0xffff;
706#endif
707
708	/* setup GDT */
709	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
710			sc->cs_limit, sc->ds_limit);
711
712	/* setup entry point 48bit pointer */
713	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
714	apm_addr.offset  = sc->cs_entry;
715
716	if ((dvp->id_flags & 0x10)) {
717		if ((dvp->id_flags & 0xf) >= 0x2) {
718			apm_driver_version(0x102);
719		}
720		if (!apm_version && (dvp->id_flags & 0xf) >= 0x1) {
721			apm_driver_version(0x101);
722		}
723	} else {
724		apm_driver_version(0x102);
725		if (!apm_version)
726			apm_driver_version(0x101);
727	}
728	if (!apm_version)
729		apm_version = 0x100;
730
731	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
732			((apm_version & 0x000f) >> 0);
733	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
734			((apm_version & 0x0f00) >> 8);
735
736	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
737
738#ifdef APM_DEBUG
739	if (sc->intversion >= INTVERSION(1, 1))
740		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
741#endif
742
743	printf("apm: found APM BIOS version %d.%d\n",
744		sc->majorversion, sc->minorversion);
745
746#ifdef APM_DEBUG
747	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
748#endif
749
750	/* enable power management */
751	if (sc->disabled) {
752		if (apm_enable_disable_pm(1)) {
753#ifdef APM_DEBUG
754			printf("apm: *Warning* enable function failed! [%x]\n",
755				apm_errno);
756#endif
757		}
758	}
759
760	/* engage power managment (APM 1.1 or later) */
761	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
762		if (apm_engage_disengage_pm(1)) {
763#ifdef APM_DEBUG
764			printf("apm: *Warning* engage function failed err=[%x]",
765				apm_errno);
766			printf(" (Docked or using external power?).\n");
767#endif
768		}
769	}
770
771        /* default suspend hook */
772        sc->sc_suspend.ah_fun = apm_default_suspend;
773        sc->sc_suspend.ah_arg = sc;
774        sc->sc_suspend.ah_name = "default suspend";
775        sc->sc_suspend.ah_order = APM_MAX_ORDER;
776
777        /* default resume hook */
778        sc->sc_resume.ah_fun = apm_default_resume;
779        sc->sc_resume.ah_arg = sc;
780        sc->sc_resume.ah_name = "default resume";
781        sc->sc_resume.ah_order = APM_MIN_ORDER;
782
783        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
784        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
785
786	apm_event_enable();
787
788	sc->initialized = 1;
789
790#ifdef DEVFS
791	sc->sc_devfs_token =
792		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
793#endif
794	return 0;
795}
796
797static int
798apmopen(dev_t dev, int flag, int fmt, struct proc *p)
799{
800	struct apm_softc *sc = &apm_softc;
801
802	if (minor(dev) != 0 || !sc->initialized)
803		return (ENXIO);
804
805	return 0;
806}
807
808static int
809apmclose(dev_t dev, int flag, int fmt, struct proc *p)
810{
811	return 0;
812}
813
814static int
815apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
816{
817	struct apm_softc *sc = &apm_softc;
818	int error = 0;
819	int newstate;
820
821	if (minor(dev) != 0 || !sc->initialized)
822		return (ENXIO);
823#ifdef APM_DEBUG
824	printf("APM ioctl: cmd = 0x%x\n", cmd);
825#endif
826	switch (cmd) {
827	case APMIO_SUSPEND:
828		if ( sc->active)
829			apm_suspend();
830		else
831			error = EINVAL;
832		break;
833	case APMIO_GETINFO:
834		if (apm_get_info((apm_info_t)addr))
835			error = ENXIO;
836		break;
837	case APMIO_ENABLE:
838		apm_event_enable();
839		break;
840	case APMIO_DISABLE:
841		apm_event_disable();
842		break;
843	case APMIO_HALTCPU:
844		apm_halt_cpu();
845		break;
846	case APMIO_NOTHALTCPU:
847		apm_not_halt_cpu();
848		break;
849	case APMIO_DISPLAY:
850		newstate = *(int *)addr;
851		if (apm_display(newstate))
852			error = ENXIO;
853		break;
854	case APMIO_BIOS:
855		if (apm_bios_call((struct apm_bios_arg*)addr))
856			error = EIO;
857		break;
858	default:
859		error = EINVAL;
860		break;
861	}
862	return error;
863}
864
865
866static apm_devsw_installed = 0;
867
868static void
869apm_drvinit(void *unused)
870{
871	dev_t dev;
872
873	if( ! apm_devsw_installed ) {
874		dev = makedev(CDEV_MAJOR,0);
875		cdevsw_add(&dev,&apm_cdevsw,NULL);
876		apm_devsw_installed = 1;
877    	}
878}
879
880SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
881