apm.c revision 14680 
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 1.28 1996/03/18 21:58:22 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 kern_devconf kdc_apm = {
63	0, 0, 0,		/* filled in by dev_attach */
64	"apm", 0, { MDDT_ISA, 0 },
65	isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
66	&kdc_isa0,		/* parent */
67	0,			/* parentdata */
68	DC_UNCONFIGURED,	/* state */
69	"APM BIOS",
70	DC_CLS_MISC		/* class */
71};
72
73
74static struct apm_softc apm_softc;
75static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
76
77#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
78
79/* Map version number to integer (keeps ordering of version numbers) */
80#define INTVERSION(major, minor)	((major)*100 + (minor))
81
82static timeout_t apm_timeout;
83static d_open_t apmopen;
84static d_close_t apmclose;
85static d_ioctl_t apmioctl;
86
87#define CDEV_MAJOR 39
88static struct cdevsw apm_cdevsw =
89	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
90	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
91	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
92
93static void
94apm_registerdev(struct isa_device *id)
95{
96	if (kdc_apm.kdc_isa)
97		return;
98	kdc_apm.kdc_state = DC_UNCONFIGURED;
99	kdc_apm.kdc_description = "APM BIOS";
100	kdc_apm.kdc_unit = 0;
101	kdc_apm.kdc_isa = id;
102	dev_attach(&kdc_apm);
103}
104
105/* setup APM GDT discriptors */
106static void
107setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
108{
109	/* setup 32bit code segment */
110	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
111	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
112
113	/* setup 16bit code segment */
114	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
115	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
116
117	/* setup data segment */
118	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
119	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
120
121	/* reflect these changes on physical GDT */
122	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
123	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
124	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
125}
126
127/* 48bit far pointer */
128static struct addr48 {
129	u_long		offset;
130	u_short		segment;
131} apm_addr;
132
133static int apm_errno;
134
135inline
136int
137apm_int(u_long *eax, u_long *ebx, u_long *ecx)
138{
139	u_long cf;
140	__asm ("pushl	%%ebp
141		pushl	%%edx
142		pushl	%%esi
143		xorl	%3,%3
144		movl	%3,%%esi
145		lcall	_apm_addr
146		jnc	1f
147		incl	%3
148	1:
149		popl	%%esi
150		popl	%%edx
151		popl	%%ebp"
152		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
153		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
154		);
155	apm_errno = ((*eax) >> 8) & 0xff;
156	return cf;
157}
158
159
160/* enable/disable power management */
161static int
162apm_enable_disable_pm(struct apm_softc *sc, int enable)
163{
164	u_long eax, ebx, ecx;
165
166	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
167
168	if (sc->intversion >= INTVERSION(1, 1)) {
169		ebx  = PMDV_ALLDEV;
170	} else {
171		ebx  = 0xffff;	/* APM version 1.0 only */
172	}
173	ecx  = enable;
174	return apm_int(&eax, &ebx, &ecx);
175}
176
177/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
178static void
179apm_driver_version(void)
180{
181	u_long eax, ebx, ecx;
182
183#ifdef APM_DEBUG
184	eax = (APM_BIOS<<8) | APM_INSTCHECK;
185	ebx  = 0x0;
186	ecx  = 0x0101;
187	i = apm_int(&eax, &ebx, &ecx);
188	printf("[%04lx %04lx %04lx %ld %02x]\n",
189		eax, ebx, ecx, i, apm_errno);
190#endif
191
192	eax = (APM_BIOS << 8) | APM_DRVVERSION;
193	ebx  = 0x0;
194	ecx  = 0x0101;
195	if(!apm_int(&eax, &ebx, &ecx))
196		apm_version = eax & 0xffff;
197
198#ifdef APM_DEBUG
199	eax = (APM_BIOS << 8) | APM_INSTCHECK;
200	ebx  = 0x0;
201	ecx  = 0x0101;
202	i = apm_int(&eax, &ebx, &ecx);
203	printf("[%04lx %04lx %04lx %ld %02x]\n",
204		eax, ebx, ecx, i, apm_errno);
205#endif
206}
207
208/* engage/disengage power management (APM 1.1 or later) */
209static int
210apm_engage_disengage_pm(struct apm_softc *sc, int engage)
211{
212	u_long eax, ebx, ecx, i;
213
214	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
215	ebx = PMDV_ALLDEV;
216	ecx = engage;
217	i = apm_int(&eax, &ebx, &ecx);
218	return i;
219}
220
221/* get PM event */
222static u_int
223apm_getevent(struct apm_softc *sc)
224{
225	u_long eax, ebx, ecx;
226
227	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
228
229	ebx = 0;
230	ecx = 0;
231	if (apm_int(&eax, &ebx, &ecx))
232		return PMEV_NOEVENT;
233
234	return ebx & 0xffff;
235}
236
237/* suspend entire system */
238static int
239apm_suspend_system(struct apm_softc *sc)
240{
241	u_long eax, ebx, ecx;
242
243	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
244	ebx = PMDV_ALLDEV;
245	ecx = PMST_SUSPEND;
246
247	__asm("cli");
248	if (apm_int(&eax, &ebx, &ecx)) {
249		__asm("sti");
250		printf("Entire system suspend failure: errcode = %ld\n",
251			0xff & (eax >> 8));
252		return 1;
253	}
254	__asm("sti");
255	return 0;
256}
257
258/* Display control */
259/*
260 * Experimental implementation: My laptop machine can't handle this function
261 * If your laptop can control the display via APM, please inform me.
262 *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
263 */
264static int
265apm_display_off(void)
266{
267	u_long eax, ebx, ecx;
268
269	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
270	ebx = PMDV_2NDSTORAGE0;
271	ecx = PMST_STANDBY;
272	if (apm_int(&eax, &ebx, &ecx)) {
273		printf("Display off failure: errcode = %ld\n",
274			0xff & (eax >> 8));
275		return 1;
276	}
277
278	return 0;
279}
280
281/* APM Battery low handler */
282static void
283apm_battery_low(struct apm_softc *sc)
284{
285	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
286}
287
288/* APM hook manager */
289static struct apmhook *
290apm_add_hook(struct apmhook **list, struct apmhook *ah)
291{
292	int s;
293	struct apmhook *p, *prev;
294
295#if 0
296	printf("Add hook \"%s\"\n", ah->ah_name);
297#endif
298
299	s = splhigh();
300	if (ah == NULL) {
301		panic("illegal apm_hook!");
302	}
303	prev = NULL;
304	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
305		if (p->ah_order > ah->ah_order) {
306			break;
307		}
308	}
309
310	if (prev == NULL) {
311		ah->ah_next = *list;
312		*list = ah;
313	} else {
314		ah->ah_next = prev->ah_next;
315		prev->ah_next = ah;
316	}
317	splx(s);
318	return ah;
319}
320
321static void
322apm_del_hook(struct apmhook **list, struct apmhook *ah)
323{
324	int s;
325	struct apmhook *p, *prev;
326
327	s = splhigh();
328	prev = NULL;
329	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
330		if (p == ah) {
331			goto deleteit;
332		}
333	}
334	panic("Tried to delete unregistered apm_hook.");
335	goto nosuchnode;
336deleteit:
337	if (prev != NULL) {
338		prev->ah_next = p->ah_next;
339	} else {
340		*list = p->ah_next;
341	}
342nosuchnode:
343	splx(s);
344}
345
346
347/* APM driver calls some functions automatically */
348static void
349apm_execute_hook(struct apmhook *list)
350{
351	struct apmhook *p;
352
353	for (p = list; p != NULL; p = p->ah_next) {
354#if 0
355		printf("Execute APM hook \"%s.\"\n", p->ah_name);
356#endif
357		if ((*(p->ah_fun))(p->ah_arg)) {
358			printf("Warning: APM hook \"%s\" failed", p->ah_name);
359		}
360	}
361}
362
363
364/* establish an apm hook */
365struct apmhook *
366apm_hook_establish(int apmh, struct apmhook *ah)
367{
368	if (apmh < 0 || apmh >= NAPM_HOOK)
369		return NULL;
370
371	return apm_add_hook(&hook[apmh], ah);
372}
373
374#ifdef notused
375/* disestablish an apm hook */
376void
377apm_hook_disestablish(int apmh, struct apmhook *ah)
378{
379	if (apmh < 0 || apmh >= NAPM_HOOK)
380		return;
381
382	apm_del_hook(&hook[apmh], ah);
383}
384#endif /* notused */
385
386
387static struct timeval suspend_time;
388static struct timeval diff_time;
389
390static int
391apm_default_resume(void *arg)
392{
393	int pl;
394	u_int second, minute, hour;
395	struct timeval resume_time, tmp_time;
396
397	/* modified for adjkerntz */
398	pl = splsoftclock();
399	inittodr(0);			/* adjust time to RTC */
400	microtime(&resume_time);
401	tmp_time = time;		/* because 'time' is volatile */
402	timevaladd(&tmp_time, &diff_time);
403	time = tmp_time;
404	splx(pl);
405	second = resume_time.tv_sec - suspend_time.tv_sec;
406	hour = second / 3600;
407	second %= 3600;
408	minute = second / 60;
409	second %= 60;
410	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
411		hour, minute, second);
412	return 0;
413}
414
415static int
416apm_default_suspend(void *arg)
417{
418	int	pl;
419
420	pl = splsoftclock();
421	microtime(&diff_time);
422	inittodr(0);
423	microtime(&suspend_time);
424	timevalsub(&diff_time, &suspend_time);
425	splx(pl);
426	return 0;
427}
428
429static void apm_processevent(struct apm_softc *);
430
431/*
432 * Public interface to the suspend/resume:
433 *
434 * Execute suspend and resume hook before and after sleep, respectively.
435 *
436 */
437
438void
439apm_suspend(void)
440{
441	struct apm_softc *sc = &apm_softc;
442
443	if (!sc)
444		return;
445
446	if (sc->initialized) {
447		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
448		apm_suspend_system(sc);
449		apm_processevent(sc);
450	}
451}
452
453void
454apm_resume(void)
455{
456	struct apm_softc *sc = &apm_softc;
457
458	if (!sc)
459		return;
460
461	if (sc->initialized) {
462		apm_execute_hook(hook[APM_HOOK_RESUME]);
463	}
464}
465
466
467/* get APM information */
468static int
469apm_get_info(struct apm_softc *sc, apm_info_t aip)
470{
471	u_long eax, ebx, ecx;
472
473	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
474	ebx = PMDV_ALLDEV;
475	ecx = 0;
476
477	if (apm_int(&eax, &ebx, &ecx))
478		return 1;
479
480	aip->ai_acline    = (ebx >> 8) & 0xff;
481	aip->ai_batt_stat = ebx & 0xff;
482	aip->ai_batt_life = ecx & 0xff;
483	aip->ai_major     = (u_int)sc->majorversion;
484	aip->ai_minor     = (u_int)sc->minorversion;
485	aip->ai_status    = (u_int)sc->active;
486
487	return 0;
488}
489
490
491/* inform APM BIOS that CPU is idle */
492void
493apm_cpu_idle(void)
494{
495	struct apm_softc *sc = &apm_softc;
496
497	if (sc->idle_cpu) {
498		if (sc->active) {
499			__asm ("movw $0x5305, %ax; lcall _apm_addr");
500		}
501	}
502	/*
503	 * Some APM implementation halts CPU in BIOS, whenever
504	 * "CPU-idle" function are invoked, but swtch() of
505	 * FreeBSD halts CPU, therefore, CPU is halted twice
506	 * in the sched loop. It makes the interrupt latency
507	 * terribly long and be able to cause a serious problem
508	 * in interrupt processing. We prevent it by removing
509	 * "hlt" operation from swtch() and managed it under
510	 * APM driver.
511	 */
512	if (!sc->active || sc->halt_cpu) {
513		__asm("sti ; hlt");	/* wait for interrupt */
514	}
515}
516
517/* inform APM BIOS that CPU is busy */
518void
519apm_cpu_busy(void)
520{
521	struct apm_softc *sc = &apm_softc;
522
523	if (sc->idle_cpu && sc->active) {
524		__asm("movw $0x5306, %ax; lcall _apm_addr");
525	}
526}
527
528
529/*
530 * APM timeout routine:
531 *
532 * This routine is automatically called by timer once per second.
533 */
534
535static void
536apm_timeout(void *arg)
537{
538	struct apm_softc *sc = arg;
539
540	apm_processevent(sc);
541	timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
542}
543
544/* enable APM BIOS */
545static void
546apm_event_enable(struct apm_softc *sc)
547{
548#ifdef APM_DEBUG
549	printf("called apm_event_enable()\n");
550#endif
551	if (sc->initialized) {
552		sc->active = 1;
553		apm_timeout(sc);
554	}
555}
556
557/* disable APM BIOS */
558static void
559apm_event_disable(struct apm_softc *sc)
560{
561#ifdef APM_DEBUG
562	printf("called apm_event_disable()\n");
563#endif
564	if (sc->initialized) {
565		untimeout(apm_timeout, NULL);
566		sc->active = 0;
567	}
568}
569
570/* halt CPU in scheduling loop */
571static void
572apm_halt_cpu(struct apm_softc *sc)
573{
574	if (sc->initialized) {
575		sc->halt_cpu = 1;
576	}
577}
578
579/* don't halt CPU in scheduling loop */
580static void
581apm_not_halt_cpu(struct apm_softc *sc)
582{
583	if (sc->initialized) {
584		sc->halt_cpu = 0;
585	}
586}
587
588/* device driver definitions */
589static int apmprobe (struct isa_device *);
590static int apmattach(struct isa_device *);
591struct isa_driver apmdriver = {
592	apmprobe, apmattach, "apm" };
593
594/*
595 * probe APM (dummy):
596 *
597 * APM probing routine is placed on locore.s and apm_init.S because
598 * this process forces the CPU to turn to real mode or V86 mode.
599 * Current version uses real mode, but on future version, we want
600 * to use V86 mode in APM initialization.
601 */
602
603static int
604apmprobe(struct isa_device *dvp)
605{
606	if ( dvp->id_unit > 0 ) {
607		printf("apm: Only one APM driver supported.\n");
608		return 0;
609	}
610	apm_registerdev(dvp);
611	switch (apm_version) {
612	case APMINI_CANTFIND:
613		/* silent */
614		return 0;
615	case APMINI_NOT32BIT:
616		printf("apm: 32bit connection is not supported.\n");
617		return 0;
618	case APMINI_CONNECTERR:
619		printf("apm: 32-bit connection error.\n");
620		return 0;
621	}
622
623	return -1;
624}
625
626
627/* Process APM event */
628static void
629apm_processevent(struct apm_softc *sc)
630{
631	int apm_event;
632
633#ifdef APM_DEBUG
634#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
635	printf("Original APM Event: " #symbol "\n");
636#else
637#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
638#endif
639	while (1) {
640		apm_event = apm_getevent(sc);
641		if (apm_event == PMEV_NOEVENT)
642			break;
643		switch (apm_event) {
644		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
645			apm_suspend();
646			break;
647		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
648			apm_suspend();
649			break;
650		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
651			apm_suspend();
652			break;
653		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
654			apm_suspend();
655			break;
656		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
657			apm_resume();
658			break;
659		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
660			apm_resume();
661			break;
662		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
663			apm_resume();
664			break;
665		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
666			apm_battery_low(sc);
667			apm_suspend();
668			break;
669
670		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
671			break;
672
673		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
674			inittodr(0);	/* adjust time to RTC */
675			break;
676
677		    default:
678			printf("Unknown Original APM Event 0x%x\n", apm_event);
679			    break;
680		}
681	}
682}
683
684/*
685 * Attach APM:
686 *
687 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
688 */
689
690static int
691apmattach(struct isa_device *dvp)
692{
693#define APM_KERNBASE	KERNBASE
694	struct apm_softc	*sc = &apm_softc;
695
696	sc->initialized = 0;
697
698	/* Must be externally enabled */
699	sc->active = 0;
700
701	/* setup APM parameters */
702	sc->cs16_base = (apm_cs32_base << 4) + APM_KERNBASE;
703	sc->cs32_base = (apm_cs16_base << 4) + APM_KERNBASE;
704	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
705	sc->cs_limit = apm_cs_limit;
706	sc->ds_limit = apm_ds_limit;
707	sc->cs_entry = apm_cs_entry;
708
709	sc->halt_cpu = 1;
710	sc->idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
711	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
712	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
713
714	/* print bootstrap messages */
715#ifdef APM_DEBUG
716	printf(" found APM BIOS version %04x\n",  apm_version);
717	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
718		sc->cs32_base, sc->cs16_base, sc->ds_base);
719	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
720		sc->cs_entry, is_enabled(sc->idle_cpu),
721		is_enabled(!sc->disabled));
722	printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
723#endif /* APM_DEBUG */
724
725	sc->cs_limit = 0xffff;
726	sc->ds_limit = 0xffff;
727
728	/* setup GDT */
729	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
730			sc->cs_limit, sc->ds_limit);
731
732	/* setup entry point 48bit pointer */
733	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
734	apm_addr.offset  = sc->cs_entry;
735
736	/* Try to kick bios into 1.1 mode */
737	apm_driver_version();
738	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
739			((apm_version & 0x000f) >> 0);
740	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
741			((apm_version & 0x0f00) >> 8);
742
743	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
744
745	if (sc->intversion >= INTVERSION(1, 1)) {
746		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
747	}
748
749	printf(" found APM BIOS version %d.%d\n",
750		sc->majorversion, sc->minorversion);
751	printf("apm: Idling CPU %s\n", is_enabled(sc->idle_cpu));
752
753	/* enable power management */
754	if (sc->disabled) {
755		if (apm_enable_disable_pm(sc, 1)) {
756			printf("Warning: APM enable function failed! [%x]\n",
757				apm_errno);
758		}
759	}
760
761	/* engage power managment (APM 1.1 or later) */
762	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
763		if (apm_engage_disengage_pm(sc, 1)) {
764			printf("Warning: APM engage function failed [%x]\n",
765				apm_errno);
766		}
767	}
768
769        /* default suspend hook */
770        sc->sc_suspend.ah_fun = apm_default_suspend;
771        sc->sc_suspend.ah_arg = sc;
772        sc->sc_suspend.ah_name = "default suspend";
773        sc->sc_suspend.ah_order = APM_MAX_ORDER;
774
775        /* default resume hook */
776        sc->sc_resume.ah_fun = apm_default_resume;
777        sc->sc_resume.ah_arg = sc;
778        sc->sc_resume.ah_name = "default resume";
779        sc->sc_resume.ah_order = APM_MIN_ORDER;
780
781        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
782        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
783
784	apm_event_enable(sc);
785
786	sc->initialized = 1;
787
788#ifdef DEVFS
789	sc->sc_devfs_token = devfs_add_devsw(
790		"/",	"apm",	&apm_cdevsw,	0,	DV_CHR,	0,  0, 0600);
791#endif
792	return 0;
793}
794
795static int
796apmopen(dev_t dev, int flag, int fmt, struct proc *p)
797{
798	struct apm_softc *sc = &apm_softc;
799
800	if (minor(dev) != 0 || !sc->initialized)
801		return (ENXIO);
802
803	return 0;
804}
805
806static int
807apmclose(dev_t dev, int flag, int fmt, struct proc *p)
808{
809	return 0;
810}
811
812static int
813apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
814{
815	struct apm_softc *sc = &apm_softc;
816	int error = 0;
817
818	if (minor(dev) != 0 || !sc->initialized)
819		return (ENXIO);
820#ifdef APM_DEBUG
821	printf("APM ioctl: cmd = 0x%x\n", cmd);
822#endif
823	switch (cmd) {
824	case APMIO_SUSPEND:
825		apm_suspend();
826		break;
827	case APMIO_GETINFO:
828		if (apm_get_info(sc, (apm_info_t)addr)) {
829			error = ENXIO;
830		}
831		break;
832	case APMIO_ENABLE:
833		kdc_apm.kdc_state = DC_BUSY;
834		apm_event_enable(sc);
835		break;
836	case APMIO_DISABLE:
837		kdc_apm.kdc_state = DC_IDLE;
838		apm_event_disable(sc);
839		break;
840	case APMIO_HALTCPU:
841		apm_halt_cpu(sc);
842		break;
843	case APMIO_NOTHALTCPU:
844		apm_not_halt_cpu(sc);
845		break;
846	case APMIO_DISPLAYOFF:
847		if (apm_display_off()) {
848			error = ENXIO;
849		}
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