apm.c revision 14691 
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 1.32 1996/03/18 23:30:14 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 <sys/devconf.h>
43#include "apm_setup.h"
44
45static int apm_display_off __P((void));
46static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx));
47static void apm_resume __P((void));
48
49/* static data */
50struct apm_softc {
51	int	initialized, active, halt_cpu;
52	u_int	minorversion, majorversion;
53	u_int	cs32_base, cs16_base, ds_base;
54	u_int	cs_limit, ds_limit;
55	u_int	cs_entry;
56	u_int	intversion;
57	int	idle_cpu, disabled, disengaged;
58	struct apmhook sc_suspend;
59	struct apmhook sc_resume;
60	void 	*sc_devfs_token;
61};
62
63static struct kern_devconf kdc_apm = {
64	0, 0, 0,		/* filled in by dev_attach */
65	"apm", 0, { MDDT_ISA, 0 },
66	isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
67	&kdc_isa0,		/* parent */
68	0,			/* parentdata */
69	DC_UNCONFIGURED,	/* state */
70	"APM BIOS",
71	DC_CLS_MISC		/* class */
72};
73
74
75static struct apm_softc apm_softc;
76static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
77
78#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
79
80/* Map version number to integer (keeps ordering of version numbers) */
81#define INTVERSION(major, minor)	((major)*100 + (minor))
82
83static timeout_t apm_timeout;
84static d_open_t apmopen;
85static d_close_t apmclose;
86static d_ioctl_t apmioctl;
87
88#define CDEV_MAJOR 39
89static struct cdevsw apm_cdevsw =
90	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
91	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
92	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
93
94static void
95apm_registerdev(struct isa_device *id)
96{
97	if (kdc_apm.kdc_isa)
98		return;
99	kdc_apm.kdc_state = DC_UNCONFIGURED;
100	kdc_apm.kdc_description = "APM BIOS";
101	kdc_apm.kdc_unit = 0;
102	kdc_apm.kdc_isa = id;
103	dev_attach(&kdc_apm);
104}
105
106/* setup APM GDT discriptors */
107static void
108setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
109{
110	/* setup 32bit code segment */
111	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
112	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
113
114	/* setup 16bit code segment */
115	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
116	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
117
118	/* setup data segment */
119	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
120	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
121
122	/* reflect these changes on physical GDT */
123	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
124	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
125	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
126}
127
128/* 48bit far pointer */
129static struct addr48 {
130	u_long		offset;
131	u_short		segment;
132} apm_addr;
133
134static int apm_errno;
135
136inline
137int
138apm_int(u_long *eax, u_long *ebx, u_long *ecx)
139{
140	u_long cf;
141	__asm ("pushl	%%ebp
142		pushl	%%edx
143		pushl	%%esi
144		xorl	%3,%3
145		movl	%3,%%esi
146		lcall	_apm_addr
147		jnc	1f
148		incl	%3
149	1:
150		popl	%%esi
151		popl	%%edx
152		popl	%%ebp"
153		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
154		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
155		);
156	apm_errno = ((*eax) >> 8) & 0xff;
157	return cf;
158}
159
160
161/* enable/disable power management */
162static int
163apm_enable_disable_pm(struct apm_softc *sc, int enable)
164{
165	u_long eax, ebx, ecx;
166
167	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
168
169	if (sc->intversion >= INTVERSION(1, 1)) {
170		ebx  = PMDV_ALLDEV;
171	} else {
172		ebx  = 0xffff;	/* APM version 1.0 only */
173	}
174	ecx  = enable;
175	return apm_int(&eax, &ebx, &ecx);
176}
177
178/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
179static void
180apm_driver_version(void)
181{
182	u_long eax, ebx, ecx;
183
184#ifdef APM_DEBUG
185	eax = (APM_BIOS<<8) | APM_INSTCHECK;
186	ebx  = 0x0;
187	ecx  = 0x0101;
188	i = apm_int(&eax, &ebx, &ecx);
189	printf("[%04lx %04lx %04lx %ld %02x]\n",
190		eax, ebx, ecx, i, apm_errno);
191#endif
192
193	eax = (APM_BIOS << 8) | APM_DRVVERSION;
194	ebx  = 0x0;
195	ecx  = 0x0101;
196	if(!apm_int(&eax, &ebx, &ecx))
197		apm_version = eax & 0xffff;
198
199#ifdef APM_DEBUG
200	eax = (APM_BIOS << 8) | APM_INSTCHECK;
201	ebx  = 0x0;
202	ecx  = 0x0101;
203	i = apm_int(&eax, &ebx, &ecx);
204	printf("[%04lx %04lx %04lx %ld %02x]\n",
205		eax, ebx, ecx, i, apm_errno);
206#endif
207}
208
209/* engage/disengage power management (APM 1.1 or later) */
210static int
211apm_engage_disengage_pm(struct apm_softc *sc, int engage)
212{
213	u_long eax, ebx, ecx, i;
214
215	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
216	ebx = PMDV_ALLDEV;
217	ecx = engage;
218	i = apm_int(&eax, &ebx, &ecx);
219	return i;
220}
221
222/* get PM event */
223static u_int
224apm_getevent(struct apm_softc *sc)
225{
226	u_long eax, ebx, ecx;
227
228	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
229
230	ebx = 0;
231	ecx = 0;
232	if (apm_int(&eax, &ebx, &ecx))
233		return PMEV_NOEVENT;
234
235	return ebx & 0xffff;
236}
237
238/* suspend entire system */
239static int
240apm_suspend_system(struct apm_softc *sc)
241{
242	u_long eax, ebx, ecx;
243
244	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
245	ebx = PMDV_ALLDEV;
246	ecx = PMST_SUSPEND;
247
248	__asm("cli");
249	if (apm_int(&eax, &ebx, &ecx)) {
250		__asm("sti");
251		printf("Entire system suspend failure: errcode = %ld\n",
252			0xff & (eax >> 8));
253		return 1;
254	}
255	__asm("sti");
256	return 0;
257}
258
259/* Display control */
260/*
261 * Experimental implementation: My laptop machine can't handle this function
262 * If your laptop can control the display via APM, please inform me.
263 *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
264 */
265static int
266apm_display_off(void)
267{
268	u_long eax, ebx, ecx;
269
270	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
271	ebx = PMDV_2NDSTORAGE0;
272	ecx = PMST_STANDBY;
273	if (apm_int(&eax, &ebx, &ecx)) {
274		printf("Display off failure: errcode = %ld\n",
275			0xff & (eax >> 8));
276		return 1;
277	}
278
279	return 0;
280}
281
282/* APM Battery low handler */
283static void
284apm_battery_low(struct apm_softc *sc)
285{
286	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
287}
288
289/* APM hook manager */
290static struct apmhook *
291apm_add_hook(struct apmhook **list, struct apmhook *ah)
292{
293	int s;
294	struct apmhook *p, *prev;
295
296#if 0
297	printf("Add hook \"%s\"\n", ah->ah_name);
298#endif
299
300	s = splhigh();
301	if (ah == NULL) {
302		panic("illegal apm_hook!");
303	}
304	prev = NULL;
305	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
306		if (p->ah_order > ah->ah_order) {
307			break;
308		}
309	}
310
311	if (prev == NULL) {
312		ah->ah_next = *list;
313		*list = ah;
314	} else {
315		ah->ah_next = prev->ah_next;
316		prev->ah_next = ah;
317	}
318	splx(s);
319	return ah;
320}
321
322static void
323apm_del_hook(struct apmhook **list, struct apmhook *ah)
324{
325	int s;
326	struct apmhook *p, *prev;
327
328	s = splhigh();
329	prev = NULL;
330	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
331		if (p == ah) {
332			goto deleteit;
333		}
334	}
335	panic("Tried to delete unregistered apm_hook.");
336	goto nosuchnode;
337deleteit:
338	if (prev != NULL) {
339		prev->ah_next = p->ah_next;
340	} else {
341		*list = p->ah_next;
342	}
343nosuchnode:
344	splx(s);
345}
346
347
348/* APM driver calls some functions automatically */
349static void
350apm_execute_hook(struct apmhook *list)
351{
352	struct apmhook *p;
353
354	for (p = list; p != NULL; p = p->ah_next) {
355#if 0
356		printf("Execute APM hook \"%s.\"\n", p->ah_name);
357#endif
358		if ((*(p->ah_fun))(p->ah_arg)) {
359			printf("Warning: APM hook \"%s\" failed", p->ah_name);
360		}
361	}
362}
363
364
365/* establish an apm hook */
366struct apmhook *
367apm_hook_establish(int apmh, struct apmhook *ah)
368{
369	if (apmh < 0 || apmh >= NAPM_HOOK)
370		return NULL;
371
372	return apm_add_hook(&hook[apmh], ah);
373}
374
375#ifdef notused
376/* disestablish an apm hook */
377void
378apm_hook_disestablish(int apmh, struct apmhook *ah)
379{
380	if (apmh < 0 || apmh >= NAPM_HOOK)
381		return;
382
383	apm_del_hook(&hook[apmh], ah);
384}
385#endif /* notused */
386
387
388static struct timeval suspend_time;
389static struct timeval diff_time;
390
391static int
392apm_default_resume(void *arg)
393{
394	int pl;
395	u_int second, minute, hour;
396	struct timeval resume_time, tmp_time;
397
398	/* modified for adjkerntz */
399	pl = splsoftclock();
400	inittodr(0);			/* adjust time to RTC */
401	microtime(&resume_time);
402	tmp_time = time;		/* because 'time' is volatile */
403	timevaladd(&tmp_time, &diff_time);
404	time = tmp_time;
405	splx(pl);
406	second = resume_time.tv_sec - suspend_time.tv_sec;
407	hour = second / 3600;
408	second %= 3600;
409	minute = second / 60;
410	second %= 60;
411	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
412		hour, minute, second);
413	return 0;
414}
415
416static int
417apm_default_suspend(void *arg)
418{
419	int	pl;
420
421	pl = splsoftclock();
422	microtime(&diff_time);
423	inittodr(0);
424	microtime(&suspend_time);
425	timevalsub(&diff_time, &suspend_time);
426	splx(pl);
427	return 0;
428}
429
430static void apm_processevent(struct apm_softc *);
431
432/*
433 * Public interface to the suspend/resume:
434 *
435 * Execute suspend and resume hook before and after sleep, respectively.
436 *
437 */
438
439void
440apm_suspend(void)
441{
442	struct apm_softc *sc = &apm_softc;
443
444	if (!sc)
445		return;
446
447	if (sc->initialized) {
448		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
449		apm_suspend_system(sc);
450		apm_processevent(sc);
451	}
452}
453
454void
455apm_resume(void)
456{
457	struct apm_softc *sc = &apm_softc;
458
459	if (!sc)
460		return;
461
462	if (sc->initialized) {
463		apm_execute_hook(hook[APM_HOOK_RESUME]);
464	}
465}
466
467
468/* get APM information */
469static int
470apm_get_info(struct apm_softc *sc, apm_info_t aip)
471{
472	u_long eax, ebx, ecx;
473
474	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
475	ebx = PMDV_ALLDEV;
476	ecx = 0;
477
478	if (apm_int(&eax, &ebx, &ecx))
479		return 1;
480
481	aip->ai_acline    = (ebx >> 8) & 0xff;
482	aip->ai_batt_stat = ebx & 0xff;
483	aip->ai_batt_life = ecx & 0xff;
484	aip->ai_major     = (u_int)sc->majorversion;
485	aip->ai_minor     = (u_int)sc->minorversion;
486	aip->ai_status    = (u_int)sc->active;
487
488	return 0;
489}
490
491
492/* inform APM BIOS that CPU is idle */
493void
494apm_cpu_idle(void)
495{
496	struct apm_softc *sc = &apm_softc;
497
498	if (sc->idle_cpu) {
499		if (sc->active) {
500			__asm ("movw $0x5305, %ax; lcall _apm_addr");
501		}
502	}
503	/*
504	 * Some APM implementation halts CPU in BIOS, whenever
505	 * "CPU-idle" function are invoked, but swtch() of
506	 * FreeBSD halts CPU, therefore, CPU is halted twice
507	 * in the sched loop. It makes the interrupt latency
508	 * terribly long and be able to cause a serious problem
509	 * in interrupt processing. We prevent it by removing
510	 * "hlt" operation from swtch() and managed it under
511	 * APM driver.
512	 */
513	if (!sc->active || sc->halt_cpu) {
514		__asm("hlt");	/* wait for interrupt */
515	}
516}
517
518/* inform APM BIOS that CPU is busy */
519void
520apm_cpu_busy(void)
521{
522	struct apm_softc *sc = &apm_softc;
523
524	if (sc->idle_cpu && sc->active) {
525		__asm("movw $0x5306, %ax; lcall _apm_addr");
526	}
527}
528
529
530/*
531 * APM timeout routine:
532 *
533 * This routine is automatically called by timer once per second.
534 */
535
536static void
537apm_timeout(void *arg)
538{
539	struct apm_softc *sc = arg;
540
541	apm_processevent(sc);
542	if (sc->active == 1) {
543		timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
544	}
545}
546
547/* enable APM BIOS */
548static void
549apm_event_enable(struct apm_softc *sc)
550{
551#ifdef APM_DEBUG
552	printf("called apm_event_enable()\n");
553#endif
554	if (sc->initialized) {
555		sc->active = 1;
556		apm_timeout(sc);
557	}
558}
559
560/* disable APM BIOS */
561static void
562apm_event_disable(struct apm_softc *sc)
563{
564#ifdef APM_DEBUG
565	printf("called apm_event_disable()\n");
566#endif
567	if (sc->initialized) {
568		untimeout(apm_timeout, NULL);
569		sc->active = 0;
570	}
571}
572
573/* halt CPU in scheduling loop */
574static void
575apm_halt_cpu(struct apm_softc *sc)
576{
577	if (sc->initialized) {
578		sc->halt_cpu = 1;
579	}
580}
581
582/* don't halt CPU in scheduling loop */
583static void
584apm_not_halt_cpu(struct apm_softc *sc)
585{
586	if (sc->initialized) {
587		sc->halt_cpu = 0;
588	}
589}
590
591/* device driver definitions */
592static int apmprobe (struct isa_device *);
593static int apmattach(struct isa_device *);
594struct isa_driver apmdriver = {
595	apmprobe, apmattach, "apm" };
596
597/*
598 * probe APM (dummy):
599 *
600 * APM probing routine is placed on locore.s and apm_init.S because
601 * this process forces the CPU to turn to real mode or V86 mode.
602 * Current version uses real mode, but on future version, we want
603 * to use V86 mode in APM initialization.
604 */
605
606static int
607apmprobe(struct isa_device *dvp)
608{
609	if ( dvp->id_unit > 0 ) {
610		printf("apm: Only one APM driver supported.\n");
611		return 0;
612	}
613	apm_registerdev(dvp);
614	switch (apm_version) {
615	case APMINI_CANTFIND:
616		/* silent */
617		return 0;
618	case APMINI_NOT32BIT:
619		printf("apm: 32bit connection is not supported.\n");
620		return 0;
621	case APMINI_CONNECTERR:
622		printf("apm: 32-bit connection error.\n");
623		return 0;
624	}
625
626	return -1;
627}
628
629
630/* Process APM event */
631static void
632apm_processevent(struct apm_softc *sc)
633{
634	int apm_event;
635
636#ifdef APM_DEBUG
637#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
638	printf("Original APM Event: " #symbol "\n");
639#else
640#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
641#endif
642	while (1) {
643		apm_event = apm_getevent(sc);
644		if (apm_event == PMEV_NOEVENT)
645			break;
646		switch (apm_event) {
647		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
648			apm_suspend();
649			break;
650		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
651			apm_suspend();
652			break;
653		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
654			apm_suspend();
655			break;
656		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
657			apm_suspend();
658			break;
659		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
660			apm_resume();
661			break;
662		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
663			apm_resume();
664			break;
665		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
666			apm_resume();
667			break;
668		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
669			apm_battery_low(sc);
670			apm_suspend();
671			break;
672
673		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
674			break;
675
676		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
677			inittodr(0);	/* adjust time to RTC */
678			break;
679
680		    default:
681			printf("Unknown Original APM Event 0x%x\n", apm_event);
682			    break;
683		}
684	}
685}
686
687/*
688 * Attach APM:
689 *
690 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
691 */
692
693static int
694apmattach(struct isa_device *dvp)
695{
696#define APM_KERNBASE	KERNBASE
697	struct apm_softc	*sc = &apm_softc;
698
699	sc->initialized = 0;
700
701	/* Must be externally enabled */
702	sc->active = 0;
703
704	/* setup APM parameters */
705	sc->cs16_base = (apm_cs32_base << 4) + APM_KERNBASE;
706	sc->cs32_base = (apm_cs16_base << 4) + APM_KERNBASE;
707	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
708	sc->cs_limit = apm_cs_limit;
709	sc->ds_limit = apm_ds_limit;
710	sc->cs_entry = apm_cs_entry;
711
712	sc->halt_cpu = 1;
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: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
721		sc->cs32_base, sc->cs16_base, sc->ds_base);
722	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
723		sc->cs_entry, is_enabled(sc->idle_cpu),
724		is_enabled(!sc->disabled));
725	printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
726#endif /* APM_DEBUG */
727
728	/* Workaround for some buggy APM BIOS implementations */
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: Engaged control %s\n", is_enabled(!sc->disengaged));
751	}
752
753	printf(" found APM BIOS version %d.%d\n",
754		sc->majorversion, sc->minorversion);
755	printf("apm: Idling CPU %s\n", is_enabled(sc->idle_cpu));
756
757	/* enable power management */
758	if (sc->disabled) {
759		if (apm_enable_disable_pm(sc, 1)) {
760			printf("Warning: APM enable function failed! [%x]\n",
761				apm_errno);
762		}
763	}
764
765	/* engage power managment (APM 1.1 or later) */
766	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
767		if (apm_engage_disengage_pm(sc, 1)) {
768			printf("Warning: APM engage function failed [%x]\n",
769				apm_errno);
770		}
771	}
772
773        /* default suspend hook */
774        sc->sc_suspend.ah_fun = apm_default_suspend;
775        sc->sc_suspend.ah_arg = sc;
776        sc->sc_suspend.ah_name = "default suspend";
777        sc->sc_suspend.ah_order = APM_MAX_ORDER;
778
779        /* default resume hook */
780        sc->sc_resume.ah_fun = apm_default_resume;
781        sc->sc_resume.ah_arg = sc;
782        sc->sc_resume.ah_name = "default resume";
783        sc->sc_resume.ah_order = APM_MIN_ORDER;
784
785        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
786        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
787
788	apm_event_enable(sc);
789	kdc_apm.kdc_state = DC_IDLE;
790
791	sc->initialized = 1;
792
793#ifdef DEVFS
794	sc->sc_devfs_token = devfs_add_devsw(
795		"/",	"apm",	&apm_cdevsw,	0,	DV_CHR,	0,  0, 0600);
796#endif
797	return 0;
798}
799
800static int
801apmopen(dev_t dev, int flag, int fmt, struct proc *p)
802{
803	struct apm_softc *sc = &apm_softc;
804
805	if (minor(dev) != 0 || !sc->initialized)
806		return (ENXIO);
807
808	return 0;
809}
810
811static int
812apmclose(dev_t dev, int flag, int fmt, struct proc *p)
813{
814	return 0;
815}
816
817static int
818apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
819{
820	struct apm_softc *sc = &apm_softc;
821	int error = 0;
822
823	if (minor(dev) != 0 || !sc->initialized)
824		return (ENXIO);
825#ifdef APM_DEBUG
826	printf("APM ioctl: cmd = 0x%x\n", cmd);
827#endif
828	switch (cmd) {
829	case APMIO_SUSPEND:
830		if ( sc->active) {
831			apm_suspend();
832		} else {
833			error = EINVAL;
834		}
835		break;
836	case APMIO_GETINFO:
837		if (apm_get_info(sc, (apm_info_t)addr)) {
838			error = ENXIO;
839		}
840		break;
841	case APMIO_ENABLE:
842		kdc_apm.kdc_state = DC_BUSY;
843		apm_event_enable(sc);
844		break;
845	case APMIO_DISABLE:
846		kdc_apm.kdc_state = DC_IDLE;
847		apm_event_disable(sc);
848		break;
849	case APMIO_HALTCPU:
850		apm_halt_cpu(sc);
851		break;
852	case APMIO_NOTHALTCPU:
853		apm_not_halt_cpu(sc);
854		break;
855	case APMIO_DISPLAYOFF:
856		if (apm_display_off()) {
857			error = ENXIO;
858		}
859		break;
860	default:
861		error = EINVAL;
862		break;
863	}
864	return error;
865}
866
867
868static apm_devsw_installed = 0;
869
870static void
871apm_drvinit(void *unused)
872{
873	dev_t dev;
874
875	if( ! apm_devsw_installed ) {
876		dev = makedev(CDEV_MAJOR,0);
877		cdevsw_add(&dev,&apm_cdevsw,NULL);
878		apm_devsw_installed = 1;
879    	}
880}
881
882SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
883