apm.c revision 31126 
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 1.64 1997/11/10 14:38:08 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, u_long *edx));
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
112static int
113apm_int(u_long *eax, u_long *ebx, u_long *ecx, u_long *edx)
114{
115	struct apm_bios_arg apa;
116	int cf;
117
118	apa.eax = *eax;
119	apa.ebx = *ebx;
120	apa.ecx = *ecx;
121	apa.edx = *edx;
122	cf = apm_bios_call(&apa);
123	*eax = apa.eax;
124	*ebx = apa.ebx;
125	*ecx = apa.ecx;
126	*edx = apa.edx;
127	apm_errno = ((*eax) >> 8) & 0xff;
128	return cf;
129}
130
131
132/* enable/disable power management */
133static int
134apm_enable_disable_pm(int enable)
135{
136	struct apm_softc *sc = &apm_softc;
137
138	u_long eax, ebx, ecx, edx;
139
140	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
141
142	if (sc->intversion >= INTVERSION(1, 1))
143		ebx  = PMDV_ALLDEV;
144	else
145		ebx  = 0xffff;	/* APM version 1.0 only */
146	ecx  = enable;
147	return apm_int(&eax, &ebx, &ecx, &edx);
148}
149
150static void
151apm_driver_version(int version)
152{
153	u_long eax, ebx, ecx, edx;
154
155	/* First try APM 1.2 */
156	eax = (APM_BIOS << 8) | APM_DRVVERSION;
157	ebx  = 0x0;
158	ecx  = version;
159	if(!apm_int(&eax, &ebx, &ecx, &edx))
160		apm_version = eax & 0xffff;
161}
162
163/* engage/disengage power management (APM 1.1 or later) */
164static int
165apm_engage_disengage_pm(int engage)
166{
167	u_long eax, ebx, ecx, edx;
168
169	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
170	ebx = PMDV_ALLDEV;
171	ecx = engage;
172	return(apm_int(&eax, &ebx, &ecx, &edx));
173}
174
175/* get PM event */
176static u_int
177apm_getevent(void)
178{
179	u_long eax, ebx, ecx, edx;
180
181	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
182
183	ebx = 0;
184	ecx = 0;
185	if (apm_int(&eax, &ebx, &ecx, &edx))
186		return PMEV_NOEVENT;
187
188	return ebx & 0xffff;
189}
190
191/* suspend entire system */
192static int
193apm_suspend_system(void)
194{
195	u_long eax, ebx, ecx, edx;
196
197	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
198	ebx = PMDV_ALLDEV;
199	ecx = PMST_SUSPEND;
200
201	if (apm_int(&eax, &ebx, &ecx, &edx)) {
202		printf("Entire system suspend failure: errcode = %ld\n",
203			0xff & (eax >> 8));
204		return 1;
205	}
206	return 0;
207}
208
209/* Display control */
210/*
211 * Experimental implementation: My laptop machine can't handle this function
212 * If your laptop can control the display via APM, please inform me.
213 *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
214 */
215static int
216apm_display(int newstate)
217{
218	u_long eax, ebx, ecx, edx;
219
220	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
221	ebx = PMDV_DISP0;
222	ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
223	if (apm_int(&eax, &ebx, &ecx, &edx)) {
224		printf("Display off failure: errcode = %ld\n",
225			0xff & (eax >> 8));
226		return 1;
227	}
228	return 0;
229}
230
231/*
232 * Turn off the entire system.
233 */
234void
235apm_power_off(void)
236{
237	u_long eax, ebx, ecx, edx;
238
239	if (!apm_softc.active)
240		return;
241	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
242	ebx = PMDV_ALLDEV;
243	ecx = PMST_OFF;
244	apm_int(&eax, &ebx, &ecx, &edx);
245}
246
247/* APM Battery low handler */
248static void
249apm_battery_low(void)
250{
251	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
252}
253
254/* APM hook manager */
255static struct apmhook *
256apm_add_hook(struct apmhook **list, struct apmhook *ah)
257{
258	int s;
259	struct apmhook *p, *prev;
260
261#ifdef APM_DEBUG
262	printf("Add hook \"%s\"\n", ah->ah_name);
263#endif
264
265	s = splhigh();
266	if (ah == NULL)
267		panic("illegal apm_hook!");
268	prev = NULL;
269	for (p = *list; p != NULL; prev = p, p = p->ah_next)
270		if (p->ah_order > ah->ah_order)
271			break;
272
273	if (prev == NULL) {
274		ah->ah_next = *list;
275		*list = ah;
276	} else {
277		ah->ah_next = prev->ah_next;
278		prev->ah_next = ah;
279	}
280	splx(s);
281	return ah;
282}
283
284static void
285apm_del_hook(struct apmhook **list, struct apmhook *ah)
286{
287	int s;
288	struct apmhook *p, *prev;
289
290	s = splhigh();
291	prev = NULL;
292	for (p = *list; p != NULL; prev = p, p = p->ah_next)
293		if (p == ah)
294			goto deleteit;
295	panic("Tried to delete unregistered apm_hook.");
296	goto nosuchnode;
297deleteit:
298	if (prev != NULL)
299		prev->ah_next = p->ah_next;
300	else
301		*list = p->ah_next;
302nosuchnode:
303	splx(s);
304}
305
306
307/* APM driver calls some functions automatically */
308static void
309apm_execute_hook(struct apmhook *list)
310{
311	struct apmhook *p;
312
313	for (p = list; p != NULL; p = p->ah_next) {
314#ifdef APM_DEBUG
315		printf("Execute APM hook \"%s.\"\n", p->ah_name);
316#endif
317		if ((*(p->ah_fun))(p->ah_arg))
318			printf("Warning: APM hook \"%s\" failed", p->ah_name);
319	}
320}
321
322
323/* establish an apm hook */
324struct apmhook *
325apm_hook_establish(int apmh, struct apmhook *ah)
326{
327	if (apmh < 0 || apmh >= NAPM_HOOK)
328		return NULL;
329
330	return apm_add_hook(&hook[apmh], ah);
331}
332
333/* disestablish an apm hook */
334void
335apm_hook_disestablish(int apmh, struct apmhook *ah)
336{
337	if (apmh < 0 || apmh >= NAPM_HOOK)
338		return;
339
340	apm_del_hook(&hook[apmh], ah);
341}
342
343
344static struct timeval suspend_time;
345static struct timeval diff_time;
346
347static int
348apm_default_resume(void *arg)
349{
350	int pl;
351	u_int second, minute, hour;
352	struct timeval resume_time, tmp_time;
353
354	/* modified for adjkerntz */
355	pl = splsoftclock();
356	inittodr(0);			/* adjust time to RTC */
357	microtime(&resume_time);
358	tmp_time = time;		/* because 'time' is volatile */
359	timevaladd(&tmp_time, &diff_time);
360	time = tmp_time;
361	splx(pl);
362	second = resume_time.tv_sec - suspend_time.tv_sec;
363	hour = second / 3600;
364	second %= 3600;
365	minute = second / 60;
366	second %= 60;
367	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
368		hour, minute, second);
369	return 0;
370}
371
372static int
373apm_default_suspend(void *arg)
374{
375	int	pl;
376
377	pl = splsoftclock();
378	microtime(&diff_time);
379	inittodr(0);
380	microtime(&suspend_time);
381	timevalsub(&diff_time, &suspend_time);
382	splx(pl);
383	return 0;
384}
385
386static void apm_processevent(void);
387
388/*
389 * Public interface to the suspend/resume:
390 *
391 * Execute suspend and resume hook before and after sleep, respectively.
392 *
393 */
394
395void
396apm_suspend(void)
397{
398	struct apm_softc *sc = &apm_softc;
399
400	if (!sc)
401		return;
402
403	if (sc->initialized) {
404		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
405		if (apm_suspend_system() == 0)
406			apm_processevent();
407		else
408			/* Failure, 'resume' the system again */
409			apm_execute_hook(hook[APM_HOOK_RESUME]);
410	}
411}
412
413void
414apm_resume(void)
415{
416	struct apm_softc *sc = &apm_softc;
417
418	if (!sc)
419		return;
420
421	if (sc->initialized)
422		apm_execute_hook(hook[APM_HOOK_RESUME]);
423}
424
425
426/* get APM information */
427static int
428apm_get_info(apm_info_t aip)
429{
430	struct apm_softc *sc = &apm_softc;
431	u_long eax, ebx, ecx, edx;
432
433	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
434	ebx = PMDV_ALLDEV;
435	ecx = 0;
436
437	if (apm_int(&eax, &ebx, &ecx, &edx))
438		return 1;
439
440	aip->ai_infoversion = 0;
441	aip->ai_acline      = (ebx >> 8) & 0xff;
442	aip->ai_batt_stat   = ebx & 0xff;
443	aip->ai_batt_life   = ecx & 0xff;
444	aip->ai_major       = (u_int)sc->majorversion;
445	aip->ai_minor       = (u_int)sc->minorversion;
446	aip->ai_status      = (u_int)sc->active;
447	edx &= 0xffff;
448	if (edx == 0xffff)	/* Time is unknown */
449		aip->ai_batt_time = -1;
450	else if (edx & 0x8000)	/* Time is in minutes */
451		aip->ai_batt_time = (edx & 0x7fff) * 60;
452	else			/* Time is in seconds */
453		aip->ai_batt_time = edx;
454	bzero(aip->ai_spare, sizeof aip->ai_spare);
455
456	return 0;
457}
458
459
460/* inform APM BIOS that CPU is idle */
461void
462apm_cpu_idle(void)
463{
464	struct apm_softc *sc = &apm_softc;
465
466	if (sc->active) {
467		u_long eax, ebx, ecx, edx;
468
469		eax = (APM_BIOS <<8) | APM_CPUIDLE;
470		ecx = ebx = 0;
471		apm_int(&eax, &ebx, &ecx, &edx);
472	}
473	/*
474	 * Some APM implementation halts CPU in BIOS, whenever
475	 * "CPU-idle" function are invoked, but swtch() of
476	 * FreeBSD halts CPU, therefore, CPU is halted twice
477	 * in the sched loop. It makes the interrupt latency
478	 * terribly long and be able to cause a serious problem
479	 * in interrupt processing. We prevent it by removing
480	 * "hlt" operation from swtch() and managed it under
481	 * APM driver.
482	 */
483	if (!sc->active || sc->always_halt_cpu)
484		__asm("hlt");	/* wait for interrupt */
485}
486
487/* inform APM BIOS that CPU is busy */
488void
489apm_cpu_busy(void)
490{
491	struct apm_softc *sc = &apm_softc;
492
493	/*
494	 * The APM specification says this is only necessary if your BIOS
495	 * slows down the processor in the idle task, otherwise it's not
496	 * necessary.
497	 */
498	if (sc->slow_idle_cpu && sc->active) {
499		u_long eax, ebx, ecx, edx;
500
501		eax = (APM_BIOS <<8) | APM_CPUBUSY;
502		ecx = ebx = 0;
503		apm_int(&eax, &ebx, &ecx, &edx);
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 *dummy)
516{
517	struct apm_softc *sc = &apm_softc;
518
519	apm_processevent();
520	if (sc->active == 1)
521		/* Run slightly more oftan than 1 Hz */
522		apm_timeout_ch = timeout(apm_timeout, NULL, hz - 1 );
523}
524
525/* enable APM BIOS */
526static void
527apm_event_enable(void)
528{
529	struct apm_softc *sc = &apm_softc;
530
531#ifdef APM_DEBUG
532	printf("called apm_event_enable()\n");
533#endif
534	if (sc->initialized) {
535		sc->active = 1;
536		apm_timeout(sc);
537	}
538}
539
540/* disable APM BIOS */
541static void
542apm_event_disable(void)
543{
544	struct apm_softc *sc = &apm_softc;
545
546#ifdef APM_DEBUG
547	printf("called apm_event_disable()\n");
548#endif
549	if (sc->initialized) {
550		untimeout(apm_timeout, NULL, apm_timeout_ch);
551		sc->active = 0;
552	}
553}
554
555/* halt CPU in scheduling loop */
556static void
557apm_halt_cpu(void)
558{
559	struct apm_softc *sc = &apm_softc;
560
561	if (sc->initialized)
562		sc->always_halt_cpu = 1;
563}
564
565/* don't halt CPU in scheduling loop */
566static void
567apm_not_halt_cpu(void)
568{
569	struct apm_softc *sc = &apm_softc;
570
571	if (sc->initialized)
572		sc->always_halt_cpu = 0;
573}
574
575/* device driver definitions */
576static int apmprobe (struct isa_device *);
577static int apmattach(struct isa_device *);
578struct isa_driver apmdriver = { apmprobe, apmattach, "apm" };
579
580/*
581 * probe APM (dummy):
582 *
583 * APM probing routine is placed on locore.s and apm_init.S because
584 * this process forces the CPU to turn to real mode or V86 mode.
585 * Current version uses real mode, but in a future version, we want
586 * to use V86 mode in APM initialization.
587 */
588
589static int
590apmprobe(struct isa_device *dvp)
591{
592	bzero(&apm_softc, sizeof(apm_softc));
593
594	if ( dvp->id_unit > 0 ) {
595		printf("apm: Only one APM driver supported.\n");
596		return 0;
597	}
598	switch (apm_version) {
599	case APMINI_CANTFIND:
600		/* silent */
601		return 0;
602	case APMINI_NOT32BIT:
603		printf("apm: 32bit connection is not supported.\n");
604		return 0;
605	case APMINI_CONNECTERR:
606		printf("apm: 32-bit connection error.\n");
607		return 0;
608	}
609	if (dvp->id_flags & 0x20)
610		statclock_disable = 1;
611	return -1;
612}
613
614
615/* Process APM event */
616static void
617apm_processevent(void)
618{
619	int apm_event;
620
621#ifdef APM_DEBUG
622#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
623	printf("Received APM Event: " #symbol "\n");
624#else
625#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
626#endif
627	do {
628		apm_event = apm_getevent();
629		switch (apm_event) {
630		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
631			apm_suspend();
632			break;
633		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
634			apm_suspend();
635			break;
636		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
637			apm_suspend();
638			break;
639		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
640			apm_suspend();
641			break;
642		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
643			apm_resume();
644			break;
645		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
646			apm_resume();
647			break;
648		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
649			apm_resume();
650			break;
651		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
652			apm_battery_low();
653			apm_suspend();
654			break;
655		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
656			break;
657		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
658			inittodr(0);	/* adjust time to RTC */
659			break;
660		    case PMEV_NOEVENT:
661			break;
662		    default:
663			printf("Unknown Original APM Event 0x%x\n", apm_event);
664			    break;
665		}
666	} while (apm_event != PMEV_NOEVENT);
667}
668
669/*
670 * Attach APM:
671 *
672 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
673 */
674
675static int
676apmattach(struct isa_device *dvp)
677{
678#define APM_KERNBASE	KERNBASE
679	struct apm_softc	*sc = &apm_softc;
680
681	sc->initialized = 0;
682
683	/* Must be externally enabled */
684	sc->active = 0;
685
686	/* setup APM parameters */
687	sc->cs16_base = (apm_cs16_base << 4) + APM_KERNBASE;
688	sc->cs32_base = (apm_cs32_base << 4) + APM_KERNBASE;
689	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
690	sc->cs_limit = apm_cs_limit;
691	sc->ds_limit = apm_ds_limit;
692	sc->cs_entry = apm_cs_entry;
693
694	/* Always call HLT in idle loop */
695	sc->always_halt_cpu = 1;
696
697	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
698	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
699	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
700
701	/* print bootstrap messages */
702#ifdef APM_DEBUG
703	printf("apm: APM BIOS version %04x\n",  apm_version);
704	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
705		sc->cs32_base, sc->cs16_base, sc->ds_base);
706	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
707		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
708		is_enabled(!sc->disabled));
709	printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
710		sc->cs_limit, sc->ds_limit);
711#endif /* APM_DEBUG */
712
713#if 0
714	/* Workaround for some buggy APM BIOS implementations */
715	sc->cs_limit = 0xffff;
716	sc->ds_limit = 0xffff;
717#endif
718
719	/* setup GDT */
720	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
721			sc->cs_limit, sc->ds_limit);
722
723	/* setup entry point 48bit pointer */
724	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
725	apm_addr.offset  = sc->cs_entry;
726
727	if ((dvp->id_flags & 0x10)) {
728		if ((dvp->id_flags & 0xf) >= 0x2) {
729			apm_driver_version(0x102);
730		}
731		if (!apm_version && (dvp->id_flags & 0xf) >= 0x1) {
732			apm_driver_version(0x101);
733		}
734	} else {
735		apm_driver_version(0x102);
736		if (!apm_version)
737			apm_driver_version(0x101);
738	}
739	if (!apm_version)
740		apm_version = 0x100;
741
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#ifdef APM_DEBUG
750	if (sc->intversion >= INTVERSION(1, 1))
751		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
752#endif
753
754	printf("apm: found APM BIOS version %d.%d\n",
755		sc->majorversion, sc->minorversion);
756
757#ifdef APM_DEBUG
758	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
759#endif
760
761	/* enable power management */
762	if (sc->disabled) {
763		if (apm_enable_disable_pm(1)) {
764#ifdef APM_DEBUG
765			printf("apm: *Warning* enable function failed! [%x]\n",
766				apm_errno);
767#endif
768		}
769	}
770
771	/* engage power managment (APM 1.1 or later) */
772	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
773		if (apm_engage_disengage_pm(1)) {
774#ifdef APM_DEBUG
775			printf("apm: *Warning* engage function failed err=[%x]",
776				apm_errno);
777			printf(" (Docked or using external power?).\n");
778#endif
779		}
780	}
781
782        /* default suspend hook */
783        sc->sc_suspend.ah_fun = apm_default_suspend;
784        sc->sc_suspend.ah_arg = sc;
785        sc->sc_suspend.ah_name = "default suspend";
786        sc->sc_suspend.ah_order = APM_MAX_ORDER;
787
788        /* default resume hook */
789        sc->sc_resume.ah_fun = apm_default_resume;
790        sc->sc_resume.ah_arg = sc;
791        sc->sc_resume.ah_name = "default resume";
792        sc->sc_resume.ah_order = APM_MIN_ORDER;
793
794        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
795        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
796
797	apm_event_enable();
798
799	sc->initialized = 1;
800
801#ifdef DEVFS
802	sc->sc_devfs_token =
803		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
804#endif
805	return 0;
806}
807
808static int
809apmopen(dev_t dev, int flag, int fmt, struct proc *p)
810{
811	struct apm_softc *sc = &apm_softc;
812
813	if (minor(dev) != 0 || !sc->initialized)
814		return (ENXIO);
815
816	return 0;
817}
818
819static int
820apmclose(dev_t dev, int flag, int fmt, struct proc *p)
821{
822	return 0;
823}
824
825static int
826apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
827{
828	struct apm_softc *sc = &apm_softc;
829	int error = 0;
830	int newstate;
831
832	if (minor(dev) != 0 || !sc->initialized)
833		return (ENXIO);
834#ifdef APM_DEBUG
835	printf("APM ioctl: cmd = 0x%x\n", cmd);
836#endif
837	switch (cmd) {
838	case APMIO_SUSPEND:
839		if ( sc->active)
840			apm_suspend();
841		else
842			error = EINVAL;
843		break;
844	case APMIO_GETINFO_OLD:
845		{
846			struct apm_info info;
847			apm_info_old_t aiop;
848
849			if (apm_get_info(&info))
850				error = ENXIO;
851			aiop = (apm_info_old_t)addr;
852			aiop->ai_major = info.ai_major;
853			aiop->ai_minor = info.ai_minor;
854			aiop->ai_acline = info.ai_acline;
855			aiop->ai_batt_stat = info.ai_batt_stat;
856			aiop->ai_batt_life = info.ai_batt_life;
857			aiop->ai_status = info.ai_status;
858		}
859		break;
860	case APMIO_GETINFO:
861		if (apm_get_info((apm_info_t)addr))
862			error = ENXIO;
863		break;
864	case APMIO_ENABLE:
865		apm_event_enable();
866		break;
867	case APMIO_DISABLE:
868		apm_event_disable();
869		break;
870	case APMIO_HALTCPU:
871		apm_halt_cpu();
872		break;
873	case APMIO_NOTHALTCPU:
874		apm_not_halt_cpu();
875		break;
876	case APMIO_DISPLAY:
877		newstate = *(int *)addr;
878		if (apm_display(newstate))
879			error = ENXIO;
880		break;
881	case APMIO_BIOS:
882		if (apm_bios_call((struct apm_bios_arg*)addr))
883			error = EIO;
884		break;
885	default:
886		error = EINVAL;
887		break;
888	}
889	return error;
890}
891
892
893static apm_devsw_installed = 0;
894
895static void
896apm_drvinit(void *unused)
897{
898	dev_t dev;
899
900	if( ! apm_devsw_installed ) {
901		dev = makedev(CDEV_MAJOR,0);
902		cdevsw_add(&dev,&apm_cdevsw,NULL);
903		apm_devsw_installed = 1;
904    	}
905}
906
907SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
908