apm.c revision 14608 
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 1.26 1996/03/12 21:51:58 nate Exp $
17 */
18
19#include "apm.h"
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/malloc.h>
29#include <sys/ioctl.h>
30#include <sys/file.h>
31#include <sys/proc.h>
32#include <sys/vnode.h>
33#include "i386/isa/isa.h"
34#include "i386/isa/isa_device.h"
35#include <machine/apm_bios.h>
36#include <machine/segments.h>
37#include <machine/clock.h>
38#include <vm/vm.h>
39#include <vm/vm_param.h>
40#include <vm/pmap.h>
41#include <sys/syslog.h>
42#include "apm_setup.h"
43
44static int apm_display_off __P((void));
45static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx));
46static void apm_resume __P((void));
47
48/* static data */
49struct apm_softc {
50	int	initialized, active, halt_cpu;
51	u_int	minorversion, majorversion;
52	u_int	cs32_base, cs16_base, ds_base;
53	u_int	cs_limit, ds_limit;
54	u_int	cs_entry;
55	u_int	intversion;
56	int	idle_cpu, disabled, disengaged;
57	struct apmhook sc_suspend;
58	struct apmhook sc_resume;
59	void 	*sc_devfs_token;
60};
61
62static struct apm_softc apm_softc[NAPM];
63static struct apm_softc *master_softc = NULL; 	/* XXX */
64static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
65
66#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
67
68/* Map version number to integer (keeps ordering of version numbers) */
69#define INTVERSION(major, minor)	((major)*100 + (minor))
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 */
105static struct addr48 {
106	u_long		offset;
107	u_short		segment;
108} apm_addr;
109
110static int apm_errno;
111
112inline
113int
114apm_int(u_long *eax, u_long *ebx, u_long *ecx)
115{
116	u_long cf;
117	__asm ("pushl	%%ebp
118		pushl	%%edx
119		pushl	%%esi
120		xorl	%3,%3
121		movl	%3,%%esi
122		lcall	_apm_addr
123		jnc	1f
124		incl	%3
125	1:
126		popl	%%esi
127		popl	%%edx
128		popl	%%ebp"
129		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
130		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
131		);
132	apm_errno = ((*eax) >> 8) & 0xff;
133	return cf;
134}
135
136
137/* enable/disable power management */
138static int
139apm_enable_disable_pm(struct apm_softc *sc, int enable)
140{
141	u_long eax, ebx, ecx;
142
143	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
144
145	if (sc->intversion >= INTVERSION(1, 1)) {
146		ebx  = PMDV_ALLDEV;
147	} else {
148		ebx  = 0xffff;	/* APM version 1.0 only */
149	}
150	ecx  = enable;
151	return apm_int(&eax, &ebx, &ecx);
152}
153
154/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
155static void
156apm_driver_version(void)
157{
158	u_long eax, ebx, ecx;
159
160#ifdef APM_DEBUG
161	eax = (APM_BIOS<<8) | APM_INSTCHECK;
162	ebx  = 0x0;
163	ecx  = 0x0101;
164	i = apm_int(&eax, &ebx, &ecx);
165	printf("[%04lx %04lx %04lx %ld %02x]\n",
166		eax, ebx, ecx, i, apm_errno);
167#endif
168
169	eax = (APM_BIOS << 8) | APM_DRVVERSION;
170	ebx  = 0x0;
171	ecx  = 0x0101;
172	if(!apm_int(&eax, &ebx, &ecx))
173		apm_version = eax & 0xffff;
174
175#ifdef APM_DEBUG
176	eax = (APM_BIOS << 8) | APM_INSTCHECK;
177	ebx  = 0x0;
178	ecx  = 0x0101;
179	i = apm_int(&eax, &ebx, &ecx);
180	printf("[%04lx %04lx %04lx %ld %02x]\n",
181		eax, ebx, ecx, i, apm_errno);
182#endif
183}
184
185/* engage/disengage power management (APM 1.1 or later) */
186static int
187apm_engage_disengage_pm(struct apm_softc *sc, int engage)
188{
189	u_long eax, ebx, ecx, i;
190
191	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
192	ebx = PMDV_ALLDEV;
193	ecx = engage;
194	i = apm_int(&eax, &ebx, &ecx);
195	return i;
196}
197
198/* get PM event */
199static u_int
200apm_getevent(struct apm_softc *sc)
201{
202	u_long eax, ebx, ecx;
203
204	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
205
206	ebx = 0;
207	ecx = 0;
208	if (apm_int(&eax, &ebx, &ecx))
209		return PMEV_NOEVENT;
210
211	return ebx & 0xffff;
212}
213
214/* suspend entire system */
215static int
216apm_suspend_system(struct apm_softc *sc)
217{
218	u_long eax, ebx, ecx;
219
220	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
221	ebx = PMDV_ALLDEV;
222	ecx = PMST_SUSPEND;
223
224	__asm("cli");
225	if (apm_int(&eax, &ebx, &ecx)) {
226		__asm("sti");
227		printf("Entire system suspend failure: errcode = %ld\n",
228			0xff & (eax >> 8));
229		return 1;
230	}
231	__asm("sti");
232	return 0;
233}
234
235/* Display control */
236/*
237 * Experimental implementation: My laptop machine can't handle this function
238 * If your laptop can control the display via APM, please inform me.
239 *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
240 */
241static int
242apm_display_off(void)
243{
244	u_long eax, ebx, ecx;
245
246	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
247	ebx = PMDV_2NDSTORAGE0;
248	ecx = PMST_STANDBY;
249	if (apm_int(&eax, &ebx, &ecx)) {
250		printf("Display off failure: errcode = %ld\n",
251			0xff & (eax >> 8));
252		return 1;
253	}
254
255	return 0;
256}
257
258/* APM Battery low handler */
259static void
260apm_battery_low(struct apm_softc *sc)
261{
262	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
263}
264
265/* APM hook manager */
266static struct apmhook *
267apm_add_hook(struct apmhook **list, struct apmhook *ah)
268{
269	int s;
270	struct apmhook *p, *prev;
271
272#if 0
273	printf("Add hook \"%s\"\n", ah->ah_name);
274#endif
275
276	s = splhigh();
277	if (ah == NULL) {
278		panic("illegal apm_hook!");
279	}
280	prev = NULL;
281	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
282		if (p->ah_order > ah->ah_order) {
283			break;
284		}
285	}
286
287	if (prev == NULL) {
288		ah->ah_next = *list;
289		*list = ah;
290	} else {
291		ah->ah_next = prev->ah_next;
292		prev->ah_next = ah;
293	}
294	splx(s);
295	return ah;
296}
297
298static void
299apm_del_hook(struct apmhook **list, struct apmhook *ah)
300{
301	int s;
302	struct apmhook *p, *prev;
303
304	s = splhigh();
305	prev = NULL;
306	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
307		if (p == ah) {
308			goto deleteit;
309		}
310	}
311	panic("Tried to delete unregistered apm_hook.");
312	goto nosuchnode;
313deleteit:
314	if (prev != NULL) {
315		prev->ah_next = p->ah_next;
316	} else {
317		*list = p->ah_next;
318	}
319nosuchnode:
320	splx(s);
321}
322
323
324/* APM driver calls some functions automatically */
325static void
326apm_execute_hook(struct apmhook *list)
327{
328	struct apmhook *p;
329
330	for (p = list; p != NULL; p = p->ah_next) {
331#if 0
332		printf("Execute APM hook \"%s.\"\n", p->ah_name);
333#endif
334		if ((*(p->ah_fun))(p->ah_arg)) {
335			printf("Warning: APM hook \"%s\" failed", p->ah_name);
336		}
337	}
338}
339
340
341/* establish an apm hook */
342struct apmhook *
343apm_hook_establish(int apmh, struct apmhook *ah)
344{
345	if (apmh < 0 || apmh >= NAPM_HOOK)
346		return NULL;
347
348	return apm_add_hook(&hook[apmh], ah);
349}
350
351#ifdef notused
352/* disestablish an apm hook */
353void
354apm_hook_disestablish(int apmh, struct apmhook *ah)
355{
356	if (apmh < 0 || apmh >= NAPM_HOOK)
357		return;
358
359	apm_del_hook(&hook[apmh], ah);
360}
361#endif /* notused */
362
363
364static struct timeval suspend_time;
365static struct timeval diff_time;
366
367static int
368apm_default_resume(void *arg)
369{
370	int pl;
371	u_int second, minute, hour;
372	struct timeval resume_time, tmp_time;
373
374	/* modified for adjkerntz */
375	pl = splsoftclock();
376	inittodr(0);			/* adjust time to RTC */
377	microtime(&resume_time);
378	tmp_time = time;		/* because 'time' is volatile */
379	timevaladd(&tmp_time, &diff_time);
380	time = tmp_time;
381	splx(pl);
382	second = resume_time.tv_sec - suspend_time.tv_sec;
383	hour = second / 3600;
384	second %= 3600;
385	minute = second / 60;
386	second %= 60;
387	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
388		hour, minute, second);
389	return 0;
390}
391
392static int
393apm_default_suspend(void *arg)
394{
395	int	pl;
396
397	pl = splsoftclock();
398	microtime(&diff_time);
399	inittodr(0);
400	microtime(&suspend_time);
401	timevalsub(&diff_time, &suspend_time);
402	splx(pl);
403	return 0;
404}
405
406static void apm_processevent(struct apm_softc *);
407
408/*
409 * Public interface to the suspend/resume:
410 *
411 * Execute suspend and resume hook before and after sleep, respectively.
412 *
413 */
414
415void
416apm_suspend(void)
417{
418	struct apm_softc *sc;
419
420	sc = master_softc;      /* XXX */
421	if (!sc)
422		return;
423
424	if (sc->initialized) {
425		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
426		apm_suspend_system(sc);
427		apm_processevent(sc);
428	}
429}
430
431void
432apm_resume(void)
433{
434	struct apm_softc *sc;
435
436	sc = master_softc;      /* XXX */
437	if (!sc)
438		return;
439
440	if (sc->initialized) {
441		apm_execute_hook(hook[APM_HOOK_RESUME]);
442	}
443}
444
445
446/* get APM information */
447static int
448apm_get_info(struct apm_softc *sc, apm_info_t aip)
449{
450	u_long eax, ebx, ecx;
451
452	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
453	ebx = PMDV_ALLDEV;
454	ecx = 0;
455
456	if (apm_int(&eax, &ebx, &ecx))
457		return 1;
458
459	aip->ai_acline    = (ebx >> 8) & 0xff;
460	aip->ai_batt_stat = ebx & 0xff;
461	aip->ai_batt_life = ecx & 0xff;
462	aip->ai_major     = (u_int)sc->majorversion;
463	aip->ai_minor     = (u_int)sc->minorversion;
464	aip->ai_status    = (u_int)sc->active;
465
466	return 0;
467}
468
469
470/* inform APM BIOS that CPU is idle */
471void
472apm_cpu_idle(void)
473{
474	struct apm_softc *sc = master_softc;    /* XXX */
475
476	if (sc->idle_cpu) {
477		if (sc->active) {
478			__asm ("movw $0x5305, %ax; lcall _apm_addr");
479		}
480	}
481	/*
482	 * Some APM implementation halts CPU in BIOS, whenever
483	 * "CPU-idle" function are invoked, but swtch() of
484	 * FreeBSD halts CPU, therefore, CPU is halted twice
485	 * in the sched loop. It makes the interrupt latency
486	 * terribly long and be able to cause a serious problem
487	 * in interrupt processing. We prevent it by removing
488	 * "hlt" operation from swtch() and managed it under
489	 * APM driver.
490	 */
491	if (!sc->active || sc->halt_cpu) {
492		__asm("sti ; hlt");	/* wait for interrupt */
493	}
494}
495
496/* inform APM BIOS that CPU is busy */
497void
498apm_cpu_busy(void)
499{
500	struct apm_softc *sc = master_softc;	/* XXX */
501
502	if (sc->idle_cpu && sc->active) {
503		__asm("movw $0x5306, %ax; lcall _apm_addr");
504	}
505}
506
507
508/*
509 * APM timeout routine:
510 *
511 * This routine is automatically called by timer once per second.
512 */
513
514static void
515apm_timeout(void *arg)
516{
517	struct apm_softc *sc = arg;
518
519	apm_processevent(sc);
520	timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
521}
522
523/* enable APM BIOS */
524static void
525apm_event_enable(struct apm_softc *sc)
526{
527#ifdef APM_DEBUG
528	printf("called apm_event_enable()\n");
529#endif
530	if (sc->initialized) {
531		sc->active = 1;
532		apm_timeout(sc);
533	}
534}
535
536/* disable APM BIOS */
537static void
538apm_event_disable(struct apm_softc *sc)
539{
540#ifdef APM_DEBUG
541	printf("called apm_event_disable()\n");
542#endif
543	if (sc->initialized) {
544		untimeout(apm_timeout, NULL);
545		sc->active = 0;
546	}
547}
548
549/* halt CPU in scheduling loop */
550static void
551apm_halt_cpu(struct apm_softc *sc)
552{
553	if (sc->initialized) {
554		sc->halt_cpu = 1;
555	}
556}
557
558/* don't halt CPU in scheduling loop */
559static void
560apm_not_halt_cpu(struct apm_softc *sc)
561{
562	if (sc->initialized) {
563		sc->halt_cpu = 0;
564	}
565}
566
567/* device driver definitions */
568static int apmprobe (struct isa_device *);
569static int apmattach(struct isa_device *);
570struct isa_driver apmdriver = {
571	apmprobe, apmattach, "apm" };
572
573/*
574 * probe APM (dummy):
575 *
576 * APM probing routine is placed on locore.s and apm_init.S because
577 * this process forces the CPU to turn to real mode or V86 mode.
578 * Current version uses real mode, but on future version, we want
579 * to use V86 mode in APM initialization.
580 */
581
582static int
583apmprobe(struct isa_device *dvp)
584{
585	int     unit = dvp->id_unit;
586
587	/*
588	 * XXX - This is necessary here so that we don't panic in the idle
589	 * loop because master_softc is unitialized.
590	 */
591	master_softc = &apm_softc[unit];
592
593	switch (apm_version) {
594	case APMINI_CANTFIND:
595		/* silent */
596		return 0;
597	case APMINI_NOT32BIT:
598		printf("apm%d: 32bit connection is not supported.\n", unit);
599		return 0;
600	case APMINI_CONNECTERR:
601		printf("apm%d: 32-bit connection error.\n", unit);
602		return 0;
603	}
604
605	return -1;
606}
607
608
609/* Process APM event */
610static void
611apm_processevent(struct apm_softc *sc)
612{
613	int apm_event;
614
615#ifdef APM_DEBUG
616#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
617	printf("Original APM Event: " #symbol "\n");
618#else
619#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
620#endif
621	while (1) {
622		apm_event = apm_getevent(sc);
623		if (apm_event == PMEV_NOEVENT)
624			break;
625		switch (apm_event) {
626		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
627			apm_suspend();
628			break;
629		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
630			apm_suspend();
631			break;
632		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
633			apm_suspend();
634			break;
635		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
636			apm_suspend();
637			break;
638		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
639			apm_resume();
640			break;
641		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
642			apm_resume();
643			break;
644		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
645			apm_resume();
646			break;
647		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
648			apm_battery_low(sc);
649			apm_suspend();
650			break;
651
652		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
653			break;
654
655		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
656			inittodr(0);	/* adjust time to RTC */
657			break;
658
659		    default:
660			printf("Unknown Original APM Event 0x%x\n", apm_event);
661			    break;
662		}
663	}
664}
665
666/*
667 * Attach APM:
668 *
669 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
670 *
671 * Now, unless I'm mad, (not quite ruled out yet), the APM-1.1 spec is bogus:
672 *
673 * Appendix C says under the header "APM 1.0/APM 1.1 Modal BIOS Behavior"
674 * that "When an APM Driver connects with an APM 1.1 BIOS, the APM 1.1 BIOS
675 * will default to an APM 1.0 connection.  After an APM Driver calls the APM
676 * Driver Version function, specifying that it supports APM 1.1, and [sic!]
677 * APM BIOS will change its behavior to an APM 1.1 connection.  If the APM
678 * BIOS is an APM 1.0 BIOS, the APM Driver Version function call will fail,
679 * and the connection will remain an APM 1.0 connection."
680 *
681 * OK so I can establish a 1.0 connection, and then tell that I'm a 1.1
682 * and maybe then the BIOS will tell that it too is a 1.1.
683 * Fine.
684 * Now how will I ever get the segment-limits for instance ?  There is no
685 * way I can see that I can get a 1.1 response back from an "APM Protected
686 * Mode 32-bit Interface Connect" function ???
687 *
688 * Who made this,  Intel and Microsoft ?  -- How did you guess !
689 *
690 * /phk
691 */
692
693static int
694apmattach(struct isa_device *dvp)
695{
696	int	unit = dvp->id_unit;
697	char	name[32];
698#define APM_KERNBASE	KERNBASE
699	struct apm_softc	*sc = &apm_softc[unit];
700
701	sc->initialized = 0;
702	sc->active = 0;
703	sc->halt_cpu = 1;
704
705	/* setup APM parameters */
706	sc->cs16_base = (apm_cs32_base << 4) + APM_KERNBASE;
707	sc->cs32_base = (apm_cs16_base << 4) + APM_KERNBASE;
708	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
709	sc->cs_limit = apm_cs_limit;
710	sc->ds_limit = apm_ds_limit;
711	sc->cs_entry = apm_cs_entry;
712
713	sc->idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
714	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
715	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
716
717	/* print bootstrap messages */
718#ifdef APM_DEBUG
719	printf(" found APM BIOS version %04x\n",  apm_version);
720	printf("apm%d: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
721		unit, sc->cs32_base, sc->cs16_base, sc->ds_base);
722	printf("apm%d: Code entry 0x%08x, Idling CPU %s, Management %s\n",
723		unit, sc->cs_entry, is_enabled(sc->idle_cpu),
724		is_enabled(!sc->disabled));
725	printf("apm%d: CS_limit=%x, DS_limit=%x\n",
726		unit, sc->cs_limit, sc->ds_limit);
727#endif /* APM_DEBUG */
728
729	sc->cs_limit = 0xffff;
730	sc->ds_limit = 0xffff;
731
732	/* setup GDT */
733	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
734			sc->cs_limit, sc->ds_limit);
735
736	/* setup entry point 48bit pointer */
737	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
738	apm_addr.offset  = sc->cs_entry;
739
740	/* Try to kick bios into 1.1 mode */
741	apm_driver_version();
742	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
743			((apm_version & 0x000f) >> 0);
744	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
745			((apm_version & 0x0f00) >> 8);
746
747	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
748
749	if (sc->intversion >= INTVERSION(1, 1)) {
750		printf("apm%d: Engaged control %s\n",
751			unit, is_enabled(!sc->disengaged));
752	}
753
754	printf(" found APM BIOS version %d.%d\n",
755		sc->majorversion, sc->minorversion);
756	printf("apm%d: Idling CPU %s\n", unit, is_enabled(sc->idle_cpu));
757
758	/* enable power management */
759	if (sc->disabled) {
760		if (apm_enable_disable_pm(sc, 1)) {
761			printf("Warning: APM enable function failed! [%x]\n",
762				apm_errno);
763		}
764	}
765
766	/* engage power managment (APM 1.1 or later) */
767	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
768		if (apm_engage_disengage_pm(sc, 1)) {
769			printf("Warning: APM engage function failed [%x]\n",
770				apm_errno);
771		}
772	}
773
774        /* default suspend hook */
775        sc->sc_suspend.ah_fun = apm_default_suspend;
776        sc->sc_suspend.ah_arg = sc;
777        sc->sc_suspend.ah_name = "default suspend";
778        sc->sc_suspend.ah_order = APM_MAX_ORDER;
779
780        /* default resume hook */
781        sc->sc_resume.ah_fun = apm_default_resume;
782        sc->sc_resume.ah_arg = sc;
783        sc->sc_resume.ah_name = "default resume";
784        sc->sc_resume.ah_order = APM_MIN_ORDER;
785
786        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
787        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
788
789	apm_event_enable(sc);
790
791	sc->initialized = 1;
792
793#ifdef DEVFS
794	sprintf(name,"apm%d",unit);
795	sc->sc_devfs_token = devfs_add_devsw(
796		"/",	name,	&apm_cdevsw,	unit,	DV_CHR,	0,  0, 0600);
797#endif
798	return 0;
799}
800
801static int
802apmopen(dev_t dev, int flag, int fmt, struct proc *p)
803{
804	struct apm_softc *sc = &apm_softc[minor(dev)];
805
806	if (minor(dev) >= NAPM) {
807		return (ENXIO);
808	}
809	if (!sc->initialized) {
810		return ENXIO;
811	}
812	return 0;
813}
814
815static int
816apmclose(dev_t dev, int flag, int fmt, struct proc *p)
817{
818	return 0;
819}
820
821static int
822apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
823{
824	struct apm_softc *sc = &apm_softc[minor(dev)];
825	int error = 0;
826
827#ifdef APM_DEBUG
828	printf("APM ioctl: minor = %d, cmd = 0x%x\n", minor(dev), cmd);
829#endif
830
831	if (minor(dev) >= NAPM) {
832		return ENXIO;
833	}
834	if (!sc->initialized) {
835		return ENXIO;
836	}
837	switch (cmd) {
838	case APMIO_SUSPEND:
839		apm_suspend();
840		break;
841	case APMIO_GETINFO:
842		if (apm_get_info(sc, (apm_info_t)addr)) {
843			error = ENXIO;
844		}
845		break;
846	case APMIO_ENABLE:
847		apm_event_enable(sc);
848		break;
849	case APMIO_DISABLE:
850		apm_event_disable(sc);
851		break;
852	case APMIO_HALTCPU:
853		apm_halt_cpu(sc);
854		break;
855	case APMIO_NOTHALTCPU:
856		apm_not_halt_cpu(sc);
857		break;
858	case APMIO_DISPLAYOFF:
859		if (apm_display_off()) {
860			error = ENXIO;
861		}
862		break;
863	default:
864		error = EINVAL;
865		break;
866	}
867	return error;
868}
869
870
871static apm_devsw_installed = 0;
872
873static void
874apm_drvinit(void *unused)
875{
876	dev_t dev;
877
878	if( ! apm_devsw_installed ) {
879		dev = makedev(CDEV_MAJOR,0);
880		cdevsw_add(&dev,&apm_cdevsw,NULL);
881		apm_devsw_installed = 1;
882    	}
883}
884
885SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
886