apm.c revision 17097 
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 * Copyright (c) 1996 Nate Williams <nate@FreeBSD.org>
7 *
8 * This software may be used, modified, copied, and distributed, in
9 * both source and binary form provided that the above copyright and
10 * these terms are retained. Under no circumstances is the author
11 * responsible for the proper functioning of this software, nor does
12 * the author assume any responsibility for damages incurred with its
13 * use.
14 *
15 * Sep, 1994	Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
16 *
17 *	$Id: apm.c,v 1.45 1996/07/10 15:09:46 nate Exp $
18 */
19
20#include "apm.h"
21#if NAPM > 1
22#error only one APM device may be configured
23#endif
24
25#include <sys/param.h>
26#include <sys/conf.h>
27#include <sys/kernel.h>
28#ifdef DEVFS
29#include <sys/devfsext.h>
30#endif /*DEVFS*/
31#include <sys/systm.h>
32#include <sys/malloc.h>
33#include <sys/ioctl.h>
34#include <sys/file.h>
35#include <sys/proc.h>
36#include <sys/vnode.h>
37#include "i386/isa/isa_device.h"
38#include <machine/apm_bios.h>
39#include <machine/segments.h>
40#include <machine/clock.h>
41#include <vm/vm.h>
42#include <vm/vm_param.h>
43#include <vm/pmap.h>
44#include <sys/syslog.h>
45#include <sys/devconf.h>
46#include "apm_setup.h"
47
48static int apm_display_off __P((void));
49static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx));
50static void apm_resume __P((void));
51
52/* static data */
53struct apm_softc {
54	int	initialized, active;
55	int	always_halt_cpu, slow_idle_cpu;
56	int	disabled, disengaged;
57	u_int	minorversion, majorversion;
58	u_int	cs32_base, cs16_base, ds_base;
59	u_int	cs_limit, ds_limit;
60	u_int	cs_entry;
61	u_int	intversion;
62	struct apmhook sc_suspend;
63	struct apmhook sc_resume;
64#ifdef DEVFS
65	void 	*sc_devfs_token;
66#endif
67};
68
69static struct kern_devconf kdc_apm = {
70	0, 0, 0,		/* filled in by dev_attach */
71	"apm", 0, { MDDT_ISA, 0 },
72	isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
73	&kdc_isa0,		/* parent */
74	0,			/* parentdata */
75	DC_UNCONFIGURED,	/* state */
76	"Advanced Power Management BIOS",
77	DC_CLS_MISC		/* class */
78};
79
80
81static struct apm_softc apm_softc;
82static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
83
84#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
85
86/* Map version number to integer (keeps ordering of version numbers) */
87#define INTVERSION(major, minor)	((major)*100 + (minor))
88
89static timeout_t apm_timeout;
90static d_open_t apmopen;
91static d_close_t apmclose;
92static d_ioctl_t apmioctl;
93
94#define CDEV_MAJOR 39
95static struct cdevsw apm_cdevsw =
96	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
97	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
98	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
99
100static void
101apm_registerdev(struct isa_device *id)
102{
103	if (kdc_apm.kdc_isa)
104		return;
105	kdc_apm.kdc_state = DC_UNCONFIGURED;
106	kdc_apm.kdc_unit = 0;
107	kdc_apm.kdc_isa = id;
108	dev_attach(&kdc_apm);
109}
110
111/* setup APM GDT discriptors */
112static void
113setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
114{
115	/* setup 32bit code segment */
116	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
117	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
118
119	/* setup 16bit code segment */
120	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
121	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
122
123	/* setup data segment */
124	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
125	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
126
127	/* reflect these changes on physical GDT */
128	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
129	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
130	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
131}
132
133/* 48bit far pointer */
134static struct addr48 {
135	u_long		offset;
136	u_short		segment;
137} apm_addr;
138
139static int apm_errno;
140
141inline
142int
143apm_int(u_long *eax, u_long *ebx, u_long *ecx)
144{
145	u_long cf;
146	__asm __volatile("
147		pushfl
148		cli
149		lcall	_apm_addr
150		movl	$0, %3
151		jnc	1f
152		incl	%3
153	1:
154		popfl
155		"
156		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
157		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
158		: "dx", "si", "memory"
159		);
160	apm_errno = ((*eax) >> 8) & 0xff;
161	return cf;
162}
163
164
165/* enable/disable power management */
166static int
167apm_enable_disable_pm(struct apm_softc *sc, int enable)
168{
169	u_long eax, ebx, ecx;
170
171	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
172
173	if (sc->intversion >= INTVERSION(1, 1)) {
174		ebx  = PMDV_ALLDEV;
175	} else {
176		ebx  = 0xffff;	/* APM version 1.0 only */
177	}
178	ecx  = enable;
179	return apm_int(&eax, &ebx, &ecx);
180}
181
182/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
183static void
184apm_driver_version(void)
185{
186	u_long eax, ebx, ecx;
187
188	eax = (APM_BIOS << 8) | APM_DRVVERSION;
189	ebx  = 0x0;
190	ecx  = 0x0101;
191	if(!apm_int(&eax, &ebx, &ecx))
192		apm_version = eax & 0xffff;
193}
194
195/* engage/disengage power management (APM 1.1 or later) */
196static int
197apm_engage_disengage_pm(struct apm_softc *sc, int engage)
198{
199	u_long eax, ebx, ecx;
200
201	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
202	ebx = PMDV_ALLDEV;
203	ecx = engage;
204	return(apm_int(&eax, &ebx, &ecx));
205}
206
207/* get PM event */
208static u_int
209apm_getevent(struct apm_softc *sc)
210{
211	u_long eax, ebx, ecx;
212
213	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
214
215	ebx = 0;
216	ecx = 0;
217	if (apm_int(&eax, &ebx, &ecx))
218		return PMEV_NOEVENT;
219
220	return ebx & 0xffff;
221}
222
223/* suspend entire system */
224static int
225apm_suspend_system(struct apm_softc *sc)
226{
227	u_long eax, ebx, ecx;
228
229	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
230	ebx = PMDV_ALLDEV;
231	ecx = PMST_SUSPEND;
232
233	if (apm_int(&eax, &ebx, &ecx)) {
234		printf("Entire system suspend failure: errcode = %ld\n",
235			0xff & (eax >> 8));
236		return 1;
237	}
238	return 0;
239}
240
241/* Display control */
242/*
243 * Experimental implementation: My laptop machine can't handle this function
244 * If your laptop can control the display via APM, please inform me.
245 *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
246 */
247static int
248apm_display_off(void)
249{
250	u_long eax, ebx, ecx;
251
252	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
253	ebx = PMDV_2NDSTORAGE0;
254	ecx = PMST_STANDBY;
255	if (apm_int(&eax, &ebx, &ecx)) {
256		printf("Display off failure: errcode = %ld\n",
257			0xff & (eax >> 8));
258		return 1;
259	}
260
261	return 0;
262}
263
264/* APM Battery low handler */
265static void
266apm_battery_low(struct apm_softc *sc)
267{
268	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
269}
270
271/* APM hook manager */
272static struct apmhook *
273apm_add_hook(struct apmhook **list, struct apmhook *ah)
274{
275	int s;
276	struct apmhook *p, *prev;
277
278#ifdef APM_DEBUG
279	printf("Add hook \"%s\"\n", ah->ah_name);
280#endif
281
282	s = splhigh();
283	if (ah == NULL) {
284		panic("illegal apm_hook!");
285	}
286	prev = NULL;
287	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
288		if (p->ah_order > ah->ah_order) {
289			break;
290		}
291	}
292
293	if (prev == NULL) {
294		ah->ah_next = *list;
295		*list = ah;
296	} else {
297		ah->ah_next = prev->ah_next;
298		prev->ah_next = ah;
299	}
300	splx(s);
301	return ah;
302}
303
304static void
305apm_del_hook(struct apmhook **list, struct apmhook *ah)
306{
307	int s;
308	struct apmhook *p, *prev;
309
310	s = splhigh();
311	prev = NULL;
312	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
313		if (p == ah) {
314			goto deleteit;
315		}
316	}
317	panic("Tried to delete unregistered apm_hook.");
318	goto nosuchnode;
319deleteit:
320	if (prev != NULL) {
321		prev->ah_next = p->ah_next;
322	} else {
323		*list = p->ah_next;
324	}
325nosuchnode:
326	splx(s);
327}
328
329
330/* APM driver calls some functions automatically */
331static void
332apm_execute_hook(struct apmhook *list)
333{
334	struct apmhook *p;
335
336	for (p = list; p != NULL; p = p->ah_next) {
337#ifdef APM_DEBUG
338		printf("Execute APM hook \"%s.\"\n", p->ah_name);
339#endif
340		if ((*(p->ah_fun))(p->ah_arg)) {
341			printf("Warning: APM hook \"%s\" failed", p->ah_name);
342		}
343	}
344}
345
346
347/* establish an apm hook */
348struct apmhook *
349apm_hook_establish(int apmh, struct apmhook *ah)
350{
351	if (apmh < 0 || apmh >= NAPM_HOOK)
352		return NULL;
353
354	return apm_add_hook(&hook[apmh], ah);
355}
356
357/* disestablish an apm hook */
358void
359apm_hook_disestablish(int apmh, struct apmhook *ah)
360{
361	if (apmh < 0 || apmh >= NAPM_HOOK)
362		return;
363
364	apm_del_hook(&hook[apmh], ah);
365}
366
367
368static struct timeval suspend_time;
369static struct timeval diff_time;
370
371static int
372apm_default_resume(void *arg)
373{
374	int pl;
375	u_int second, minute, hour;
376	struct timeval resume_time, tmp_time;
377
378	/* modified for adjkerntz */
379	pl = splsoftclock();
380	inittodr(0);			/* adjust time to RTC */
381	microtime(&resume_time);
382	tmp_time = time;		/* because 'time' is volatile */
383	timevaladd(&tmp_time, &diff_time);
384	time = tmp_time;
385	splx(pl);
386	second = resume_time.tv_sec - suspend_time.tv_sec;
387	hour = second / 3600;
388	second %= 3600;
389	minute = second / 60;
390	second %= 60;
391	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
392		hour, minute, second);
393	return 0;
394}
395
396static int
397apm_default_suspend(void *arg)
398{
399	int	pl;
400
401	pl = splsoftclock();
402	microtime(&diff_time);
403	inittodr(0);
404	microtime(&suspend_time);
405	timevalsub(&diff_time, &suspend_time);
406	splx(pl);
407	return 0;
408}
409
410static void apm_processevent(struct apm_softc *);
411
412/*
413 * Public interface to the suspend/resume:
414 *
415 * Execute suspend and resume hook before and after sleep, respectively.
416 *
417 */
418
419void
420apm_suspend(void)
421{
422	struct apm_softc *sc = &apm_softc;
423
424	if (!sc)
425		return;
426
427	if (sc->initialized) {
428		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
429		apm_suspend_system(sc);
430		apm_processevent(sc);
431	}
432}
433
434void
435apm_resume(void)
436{
437	struct apm_softc *sc = &apm_softc;
438
439	if (!sc)
440		return;
441
442	if (sc->initialized) {
443		apm_execute_hook(hook[APM_HOOK_RESUME]);
444	}
445}
446
447
448/* get APM information */
449static int
450apm_get_info(struct apm_softc *sc, apm_info_t aip)
451{
452	u_long eax, ebx, ecx;
453
454	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
455	ebx = PMDV_ALLDEV;
456	ecx = 0;
457
458	if (apm_int(&eax, &ebx, &ecx))
459		return 1;
460
461	aip->ai_acline    = (ebx >> 8) & 0xff;
462	aip->ai_batt_stat = ebx & 0xff;
463	aip->ai_batt_life = ecx & 0xff;
464	aip->ai_major     = (u_int)sc->majorversion;
465	aip->ai_minor     = (u_int)sc->minorversion;
466	aip->ai_status    = (u_int)sc->active;
467
468	return 0;
469}
470
471
472/* inform APM BIOS that CPU is idle */
473void
474apm_cpu_idle(void)
475{
476	struct apm_softc *sc = &apm_softc;
477
478	if (sc->active) {
479		u_long eax, ebx, ecx;
480
481		eax = (APM_BIOS <<8) | APM_CPUIDLE;
482		ecx = ebx = 0;
483		apm_int(&eax, &ebx, &ecx);
484	}
485	/*
486	 * Some APM implementation halts CPU in BIOS, whenever
487	 * "CPU-idle" function are invoked, but swtch() of
488	 * FreeBSD halts CPU, therefore, CPU is halted twice
489	 * in the sched loop. It makes the interrupt latency
490	 * terribly long and be able to cause a serious problem
491	 * in interrupt processing. We prevent it by removing
492	 * "hlt" operation from swtch() and managed it under
493	 * APM driver.
494	 */
495	if (!sc->active || sc->always_halt_cpu) {
496		__asm("hlt");	/* wait for interrupt */
497	}
498}
499
500/* inform APM BIOS that CPU is busy */
501void
502apm_cpu_busy(void)
503{
504	struct apm_softc *sc = &apm_softc;
505
506	/*
507	 * The APM specification says this is only necessary if your BIOS
508	 * slows down the processor in the idle task, otherwise it's not
509	 * necessary.
510	 */
511	if (sc->slow_idle_cpu && sc->active) {
512		u_long eax, ebx, ecx;
513
514		eax = (APM_BIOS <<8) | APM_CPUBUSY;
515		ecx = ebx = 0;
516		apm_int(&eax, &ebx, &ecx);
517	}
518}
519
520
521/*
522 * APM timeout routine:
523 *
524 * This routine is automatically called by timer once per second.
525 */
526
527static void
528apm_timeout(void *arg)
529{
530	struct apm_softc *sc = arg;
531
532	apm_processevent(sc);
533	if (sc->active == 1) {
534		timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
535	}
536}
537
538/* enable APM BIOS */
539static void
540apm_event_enable(struct apm_softc *sc)
541{
542#ifdef APM_DEBUG
543	printf("called apm_event_enable()\n");
544#endif
545	if (sc->initialized) {
546		sc->active = 1;
547		apm_timeout(sc);
548	}
549}
550
551/* disable APM BIOS */
552static void
553apm_event_disable(struct apm_softc *sc)
554{
555#ifdef APM_DEBUG
556	printf("called apm_event_disable()\n");
557#endif
558	if (sc->initialized) {
559		untimeout(apm_timeout, NULL);
560		sc->active = 0;
561	}
562}
563
564/* halt CPU in scheduling loop */
565static void
566apm_halt_cpu(struct apm_softc *sc)
567{
568	if (sc->initialized) {
569		sc->always_halt_cpu = 1;
570	}
571}
572
573/* don't halt CPU in scheduling loop */
574static void
575apm_not_halt_cpu(struct apm_softc *sc)
576{
577	if (sc->initialized) {
578		sc->always_halt_cpu = 0;
579	}
580}
581
582/* device driver definitions */
583static int apmprobe (struct isa_device *);
584static int apmattach(struct isa_device *);
585struct isa_driver apmdriver = {
586	apmprobe, apmattach, "apm" };
587
588/*
589 * probe APM (dummy):
590 *
591 * APM probing routine is placed on locore.s and apm_init.S because
592 * this process forces the CPU to turn to real mode or V86 mode.
593 * Current version uses real mode, but on future version, we want
594 * to use V86 mode in APM initialization.
595 */
596
597static int
598apmprobe(struct isa_device *dvp)
599{
600	if ( dvp->id_unit > 0 ) {
601		printf("apm: Only one APM driver supported.\n");
602		return 0;
603	}
604	apm_registerdev(dvp);
605	switch (apm_version) {
606	case APMINI_CANTFIND:
607		/* silent */
608		return 0;
609	case APMINI_NOT32BIT:
610		printf("apm: 32bit connection is not supported.\n");
611		return 0;
612	case APMINI_CONNECTERR:
613		printf("apm: 32-bit connection error.\n");
614		return 0;
615	}
616#ifdef APM_BROKEN_STATCLOCK
617	statclock_disable = 1;
618#endif
619
620	return -1;
621}
622
623
624/* Process APM event */
625static void
626apm_processevent(struct apm_softc *sc)
627{
628	int apm_event;
629
630#ifdef APM_DEBUG
631#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
632	printf("Received APM Event: " #symbol "\n");
633#else
634#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
635#endif
636	do {
637		apm_event = apm_getevent(sc);
638		switch (apm_event) {
639		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
640			apm_suspend();
641			break;
642		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
643			apm_suspend();
644			break;
645		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
646			apm_suspend();
647			break;
648		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
649			apm_suspend();
650			break;
651		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
652			apm_resume();
653			break;
654		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
655			apm_resume();
656			break;
657		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
658			apm_resume();
659			break;
660		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
661			apm_battery_low(sc);
662			apm_suspend();
663			break;
664		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
665			break;
666		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
667			inittodr(0);	/* adjust time to RTC */
668			break;
669		    OPMEV_DEBUGMESSAGE(PMEV_NOEVENT);
670			break;
671		    default:
672			printf("Unknown Original APM Event 0x%x\n", apm_event);
673			    break;
674		}
675	} while (apm_event != PMEV_NOEVENT);
676}
677
678/*
679 * Attach APM:
680 *
681 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
682 */
683
684static int
685apmattach(struct isa_device *dvp)
686{
687#define APM_KERNBASE	KERNBASE
688	struct apm_softc	*sc = &apm_softc;
689#ifdef APM_DSVALUE_BUG
690	caddr_t apm_bios_work;
691
692	/*
693	 * XXX - Malloc enough space for the APM DS, and then copy the
694	 * current DS into the new space since the DS setup by the
695	 * APM bios is going to get wiped out.
696	 */
697	apm_bios_work = (caddr_t)malloc(apm_ds_limit, M_DEVBUF, M_NOWAIT);
698	bcopy((caddr_t)((apm_ds_base << 4) + APM_KERNBASE), apm_bios_work,
699		apm_ds_limit);
700#endif /* APM_DSVALUE_BUG */
701
702	sc->initialized = 0;
703
704	/* Must be externally enabled */
705	sc->active = 0;
706
707	/* setup APM parameters */
708	sc->cs16_base = (apm_cs16_base << 4) + APM_KERNBASE;
709	sc->cs32_base = (apm_cs32_base << 4) + APM_KERNBASE;
710	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
711	sc->cs_limit = apm_cs_limit;
712	sc->ds_limit = apm_ds_limit;
713	sc->cs_entry = apm_cs_entry;
714
715#ifdef APM_DSVALUE_BUG
716	/* Set the DS base to point to the newly made copy of the APM DS */
717	sc->ds_base = (u_int)apm_bios_work;
718#endif /* APM_DSVALUE_BUG */
719
720	/* Always call HLT in idle loop */
721	sc->always_halt_cpu = 1;
722
723	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
724	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
725	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
726
727	/* print bootstrap messages */
728#ifdef APM_DEBUG
729	printf("apm: APM BIOS version %04x\n",  apm_version);
730	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
731		sc->cs32_base, sc->cs16_base, sc->ds_base);
732	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
733		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
734		is_enabled(!sc->disabled));
735	printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
736		sc->cs_limit, sc->ds_limit);
737#endif /* APM_DEBUG */
738
739#ifdef 0
740	/* Workaround for some buggy APM BIOS implementations */
741	sc->cs_limit = 0xffff;
742	sc->ds_limit = 0xffff;
743#endif
744
745	/* setup GDT */
746	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
747			sc->cs_limit, sc->ds_limit);
748
749	/* setup entry point 48bit pointer */
750	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
751	apm_addr.offset  = sc->cs_entry;
752
753#ifdef FORCE_APM10
754	apm_version = 0x100;
755	sc->majorversion = 1;
756	sc->minorversion = 0;
757	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
758	printf("apm: running in APM 1.0 compatible mode\n");
759	kcd_apm.kdc_description =
760		"Advanced Power Management BIOS (1.0 compatability mode)",
761#else
762	/* Try to kick bios into 1.1 or greater mode */
763	apm_driver_version();
764	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
765			((apm_version & 0x000f) >> 0);
766	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
767			((apm_version & 0x0f00) >> 8);
768
769	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
770
771	if (sc->intversion >= INTVERSION(1, 1)) {
772#ifdef APM_DEBUG
773		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
774#endif
775	}
776
777	printf("apm: found APM BIOS version %d.%d\n",
778		sc->majorversion, sc->minorversion);
779#endif /* FORCE_APM10 */
780
781#ifdef APM_DEBUG
782	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
783#endif
784
785	/* enable power management */
786	if (sc->disabled) {
787		if (apm_enable_disable_pm(sc, 1)) {
788#ifdef APM_DEBUG
789			printf("apm: *Warning* enable function failed! [%x]\n",
790				apm_errno);
791#endif
792		}
793	}
794
795	/* engage power managment (APM 1.1 or later) */
796	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
797		if (apm_engage_disengage_pm(sc, 1)) {
798#ifdef APM_DEBUG
799			printf("apm: *Warning* engage function failed err=[%x]",
800				apm_errno);
801			printf(" (Docked or using external power?).\n");
802#endif
803		}
804	}
805
806        /* default suspend hook */
807        sc->sc_suspend.ah_fun = apm_default_suspend;
808        sc->sc_suspend.ah_arg = sc;
809        sc->sc_suspend.ah_name = "default suspend";
810        sc->sc_suspend.ah_order = APM_MAX_ORDER;
811
812        /* default resume hook */
813        sc->sc_resume.ah_fun = apm_default_resume;
814        sc->sc_resume.ah_arg = sc;
815        sc->sc_resume.ah_name = "default resume";
816        sc->sc_resume.ah_order = APM_MIN_ORDER;
817
818        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
819        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
820
821	apm_event_enable(sc);
822	kdc_apm.kdc_state = DC_IDLE;
823
824	sc->initialized = 1;
825
826#ifdef DEVFS
827	sc->sc_devfs_token =
828		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
829#endif
830	return 0;
831}
832
833static int
834apmopen(dev_t dev, int flag, int fmt, struct proc *p)
835{
836	struct apm_softc *sc = &apm_softc;
837
838	if (minor(dev) != 0 || !sc->initialized)
839		return (ENXIO);
840
841	return 0;
842}
843
844static int
845apmclose(dev_t dev, int flag, int fmt, struct proc *p)
846{
847	return 0;
848}
849
850static int
851apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
852{
853	struct apm_softc *sc = &apm_softc;
854	int error = 0;
855
856	if (minor(dev) != 0 || !sc->initialized)
857		return (ENXIO);
858#ifdef APM_DEBUG
859	printf("APM ioctl: cmd = 0x%x\n", cmd);
860#endif
861	switch (cmd) {
862	case APMIO_SUSPEND:
863		if ( sc->active) {
864			apm_suspend();
865		} else {
866			error = EINVAL;
867		}
868		break;
869	case APMIO_GETINFO:
870		if (apm_get_info(sc, (apm_info_t)addr)) {
871			error = ENXIO;
872		}
873		break;
874	case APMIO_ENABLE:
875		kdc_apm.kdc_state = DC_BUSY;
876		apm_event_enable(sc);
877		break;
878	case APMIO_DISABLE:
879		kdc_apm.kdc_state = DC_IDLE;
880		apm_event_disable(sc);
881		break;
882	case APMIO_HALTCPU:
883		apm_halt_cpu(sc);
884		break;
885	case APMIO_NOTHALTCPU:
886		apm_not_halt_cpu(sc);
887		break;
888	case APMIO_DISPLAYOFF:
889		if (apm_display_off()) {
890			error = ENXIO;
891		}
892		break;
893	default:
894		error = EINVAL;
895		break;
896	}
897	return error;
898}
899
900
901static apm_devsw_installed = 0;
902
903static void
904apm_drvinit(void *unused)
905{
906	dev_t dev;
907
908	if( ! apm_devsw_installed ) {
909		dev = makedev(CDEV_MAJOR,0);
910		cdevsw_add(&dev,&apm_cdevsw,NULL);
911		apm_devsw_installed = 1;
912    	}
913}
914
915SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
916