apm.c revision 15298 
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 1.37 1996/03/28 14:28:00 scrappy Exp $
18 */
19
20#include "apm.h"
21
22#if NAPM > 1
23#error only one APM device may be configured
24#endif
25
26#include <sys/param.h>
27#include <sys/conf.h>
28#include <sys/kernel.h>
29#ifdef DEVFS
30#include <sys/devfsext.h>
31#endif /*DEVFS*/
32#include <sys/systm.h>
33#include <sys/malloc.h>
34#include <sys/ioctl.h>
35#include <sys/file.h>
36#include <sys/proc.h>
37#include <sys/vnode.h>
38#include "i386/isa/isa.h"
39#include "i386/isa/isa_device.h"
40#include <machine/apm_bios.h>
41#include <machine/segments.h>
42#include <machine/clock.h>
43#include <vm/vm.h>
44#include <vm/vm_param.h>
45#include <vm/pmap.h>
46#include <sys/syslog.h>
47#include <sys/devconf.h>
48#include "apm_setup.h"
49
50static int apm_display_off __P((void));
51static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx));
52static void apm_resume __P((void));
53
54/* static data */
55struct apm_softc {
56	int	initialized, active;
57	int	always_halt_cpu, slow_idle_cpu;
58	int	disabled, disengaged;
59	u_int	minorversion, majorversion;
60	u_int	cs32_base, cs16_base, ds_base;
61	u_int	cs_limit, ds_limit;
62	u_int	cs_entry;
63	u_int	intversion;
64	struct apmhook sc_suspend;
65	struct apmhook sc_resume;
66#ifdef DEVFS
67	void 	*sc_devfs_token;
68#endif
69};
70
71static struct kern_devconf kdc_apm = {
72	0, 0, 0,		/* filled in by dev_attach */
73	"apm", 0, { MDDT_ISA, 0 },
74	isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
75	&kdc_isa0,		/* parent */
76	0,			/* parentdata */
77	DC_UNCONFIGURED,	/* state */
78	"Advanced Power Management BIOS",
79	DC_CLS_MISC		/* class */
80};
81
82
83static struct apm_softc apm_softc;
84static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
85
86#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
87
88/* Map version number to integer (keeps ordering of version numbers) */
89#define INTVERSION(major, minor)	((major)*100 + (minor))
90
91static timeout_t apm_timeout;
92static d_open_t apmopen;
93static d_close_t apmclose;
94static d_ioctl_t apmioctl;
95
96#define CDEV_MAJOR 39
97static struct cdevsw apm_cdevsw =
98	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
99	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
100	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
101
102static void
103apm_registerdev(struct isa_device *id)
104{
105	if (kdc_apm.kdc_isa)
106		return;
107	kdc_apm.kdc_state = DC_UNCONFIGURED;
108	kdc_apm.kdc_unit = 0;
109	kdc_apm.kdc_isa = id;
110	dev_attach(&kdc_apm);
111}
112
113/* setup APM GDT discriptors */
114static void
115setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
116{
117	/* setup 32bit code segment */
118	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
119	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
120
121	/* setup 16bit code segment */
122	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
123	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
124
125	/* setup data segment */
126	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
127	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
128
129	/* reflect these changes on physical GDT */
130	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
131	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
132	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
133}
134
135/* 48bit far pointer */
136static struct addr48 {
137	u_long		offset;
138	u_short		segment;
139} apm_addr;
140
141static int apm_errno;
142
143inline
144int
145apm_int(u_long *eax, u_long *ebx, u_long *ecx)
146{
147	u_long cf;
148	__asm __volatile("
149		pushfl
150		cli
151		lcall	_apm_addr
152		movl	$0, %3
153		jnc	1f
154		incl	%3
155	1:
156		popfl
157		"
158		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
159		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
160		: "dx", "si", "memory"
161		);
162	apm_errno = ((*eax) >> 8) & 0xff;
163	return cf;
164}
165
166
167/* enable/disable power management */
168static int
169apm_enable_disable_pm(struct apm_softc *sc, int enable)
170{
171	u_long eax, ebx, ecx;
172
173	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
174
175	if (sc->intversion >= INTVERSION(1, 1)) {
176		ebx  = PMDV_ALLDEV;
177	} else {
178		ebx  = 0xffff;	/* APM version 1.0 only */
179	}
180	ecx  = enable;
181	return apm_int(&eax, &ebx, &ecx);
182}
183
184/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
185static void
186apm_driver_version(void)
187{
188	u_long eax, ebx, ecx;
189
190	eax = (APM_BIOS << 8) | APM_DRVVERSION;
191	ebx  = 0x0;
192	ecx  = 0x0101;
193	if(!apm_int(&eax, &ebx, &ecx))
194		apm_version = eax & 0xffff;
195}
196
197/* engage/disengage power management (APM 1.1 or later) */
198static int
199apm_engage_disengage_pm(struct apm_softc *sc, int engage)
200{
201	u_long eax, ebx, ecx;
202
203	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
204	ebx = PMDV_ALLDEV;
205	ecx = engage;
206	return(apm_int(&eax, &ebx, &ecx));
207}
208
209/* get PM event */
210static u_int
211apm_getevent(struct apm_softc *sc)
212{
213	u_long eax, ebx, ecx;
214
215	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
216
217	ebx = 0;
218	ecx = 0;
219	if (apm_int(&eax, &ebx, &ecx))
220		return PMEV_NOEVENT;
221
222	return ebx & 0xffff;
223}
224
225/* suspend entire system */
226static int
227apm_suspend_system(struct apm_softc *sc)
228{
229	u_long eax, ebx, ecx;
230
231	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
232	ebx = PMDV_ALLDEV;
233	ecx = PMST_SUSPEND;
234
235	if (apm_int(&eax, &ebx, &ecx)) {
236		printf("Entire system suspend failure: errcode = %ld\n",
237			0xff & (eax >> 8));
238		return 1;
239	}
240	return 0;
241}
242
243/* Display control */
244/*
245 * Experimental implementation: My laptop machine can't handle this function
246 * If your laptop can control the display via APM, please inform me.
247 *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
248 */
249static int
250apm_display_off(void)
251{
252	u_long eax, ebx, ecx;
253
254	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
255	ebx = PMDV_2NDSTORAGE0;
256	ecx = PMST_STANDBY;
257	if (apm_int(&eax, &ebx, &ecx)) {
258		printf("Display off failure: errcode = %ld\n",
259			0xff & (eax >> 8));
260		return 1;
261	}
262
263	return 0;
264}
265
266/* APM Battery low handler */
267static void
268apm_battery_low(struct apm_softc *sc)
269{
270	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
271}
272
273/* APM hook manager */
274static struct apmhook *
275apm_add_hook(struct apmhook **list, struct apmhook *ah)
276{
277	int s;
278	struct apmhook *p, *prev;
279
280#ifdef APM_DEBUG
281	printf("Add hook \"%s\"\n", ah->ah_name);
282#endif
283
284	s = splhigh();
285	if (ah == NULL) {
286		panic("illegal apm_hook!");
287	}
288	prev = NULL;
289	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
290		if (p->ah_order > ah->ah_order) {
291			break;
292		}
293	}
294
295	if (prev == NULL) {
296		ah->ah_next = *list;
297		*list = ah;
298	} else {
299		ah->ah_next = prev->ah_next;
300		prev->ah_next = ah;
301	}
302	splx(s);
303	return ah;
304}
305
306static void
307apm_del_hook(struct apmhook **list, struct apmhook *ah)
308{
309	int s;
310	struct apmhook *p, *prev;
311
312	s = splhigh();
313	prev = NULL;
314	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
315		if (p == ah) {
316			goto deleteit;
317		}
318	}
319	panic("Tried to delete unregistered apm_hook.");
320	goto nosuchnode;
321deleteit:
322	if (prev != NULL) {
323		prev->ah_next = p->ah_next;
324	} else {
325		*list = p->ah_next;
326	}
327nosuchnode:
328	splx(s);
329}
330
331
332/* APM driver calls some functions automatically */
333static void
334apm_execute_hook(struct apmhook *list)
335{
336	struct apmhook *p;
337
338	for (p = list; p != NULL; p = p->ah_next) {
339#ifdef APM_DEBUG
340		printf("Execute APM hook \"%s.\"\n", p->ah_name);
341#endif
342		if ((*(p->ah_fun))(p->ah_arg)) {
343			printf("Warning: APM hook \"%s\" failed", p->ah_name);
344		}
345	}
346}
347
348
349/* establish an apm hook */
350struct apmhook *
351apm_hook_establish(int apmh, struct apmhook *ah)
352{
353	if (apmh < 0 || apmh >= NAPM_HOOK)
354		return NULL;
355
356	return apm_add_hook(&hook[apmh], ah);
357}
358
359#ifdef notused
360/* disestablish an apm hook */
361void
362apm_hook_disestablish(int apmh, struct apmhook *ah)
363{
364	if (apmh < 0 || apmh >= NAPM_HOOK)
365		return;
366
367	apm_del_hook(&hook[apmh], ah);
368}
369#endif /* notused */
370
371
372static struct timeval suspend_time;
373static struct timeval diff_time;
374
375static int
376apm_default_resume(void *arg)
377{
378	int pl;
379	u_int second, minute, hour;
380	struct timeval resume_time, tmp_time;
381
382	/* modified for adjkerntz */
383	pl = splsoftclock();
384	inittodr(0);			/* adjust time to RTC */
385	microtime(&resume_time);
386	tmp_time = time;		/* because 'time' is volatile */
387	timevaladd(&tmp_time, &diff_time);
388	time = tmp_time;
389	splx(pl);
390	second = resume_time.tv_sec - suspend_time.tv_sec;
391	hour = second / 3600;
392	second %= 3600;
393	minute = second / 60;
394	second %= 60;
395	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
396		hour, minute, second);
397	return 0;
398}
399
400static int
401apm_default_suspend(void *arg)
402{
403	int	pl;
404
405	pl = splsoftclock();
406	microtime(&diff_time);
407	inittodr(0);
408	microtime(&suspend_time);
409	timevalsub(&diff_time, &suspend_time);
410	splx(pl);
411	return 0;
412}
413
414static void apm_processevent(struct apm_softc *);
415
416/*
417 * Public interface to the suspend/resume:
418 *
419 * Execute suspend and resume hook before and after sleep, respectively.
420 *
421 */
422
423void
424apm_suspend(void)
425{
426	struct apm_softc *sc = &apm_softc;
427
428	if (!sc)
429		return;
430
431	if (sc->initialized) {
432		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
433		apm_suspend_system(sc);
434		apm_processevent(sc);
435	}
436}
437
438void
439apm_resume(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_RESUME]);
448	}
449}
450
451
452/* get APM information */
453static int
454apm_get_info(struct apm_softc *sc, apm_info_t aip)
455{
456	u_long eax, ebx, ecx;
457
458	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
459	ebx = PMDV_ALLDEV;
460	ecx = 0;
461
462	if (apm_int(&eax, &ebx, &ecx))
463		return 1;
464
465	aip->ai_acline    = (ebx >> 8) & 0xff;
466	aip->ai_batt_stat = ebx & 0xff;
467	aip->ai_batt_life = ecx & 0xff;
468	aip->ai_major     = (u_int)sc->majorversion;
469	aip->ai_minor     = (u_int)sc->minorversion;
470	aip->ai_status    = (u_int)sc->active;
471
472	return 0;
473}
474
475
476/* inform APM BIOS that CPU is idle */
477void
478apm_cpu_idle(void)
479{
480	struct apm_softc *sc = &apm_softc;
481
482	if (sc->active) {
483		u_long eax, ebx, ecx;
484
485		eax = (APM_BIOS <<8) | APM_CPUIDLE;
486		ecx = ebx = 0;
487		apm_int(&eax, &ebx, &ecx);
488	}
489	/*
490	 * Some APM implementation halts CPU in BIOS, whenever
491	 * "CPU-idle" function are invoked, but swtch() of
492	 * FreeBSD halts CPU, therefore, CPU is halted twice
493	 * in the sched loop. It makes the interrupt latency
494	 * terribly long and be able to cause a serious problem
495	 * in interrupt processing. We prevent it by removing
496	 * "hlt" operation from swtch() and managed it under
497	 * APM driver.
498	 */
499	if (!sc->active || sc->always_halt_cpu) {
500		__asm("hlt");	/* wait for interrupt */
501	}
502}
503
504/* inform APM BIOS that CPU is busy */
505void
506apm_cpu_busy(void)
507{
508	struct apm_softc *sc = &apm_softc;
509
510	/*
511	 * The APM specification says this is only necessary if your BIOS
512	 * slows down the processor in the idle task, otherwise it's not
513	 * necessary.
514	 */
515	if (sc->slow_idle_cpu && sc->active) {
516		u_long eax, ebx, ecx;
517
518		eax = (APM_BIOS <<8) | APM_CPUBUSY;
519		ecx = ebx = 0;
520		apm_int(&eax, &ebx, &ecx);
521	}
522}
523
524
525/*
526 * APM timeout routine:
527 *
528 * This routine is automatically called by timer once per second.
529 */
530
531static void
532apm_timeout(void *arg)
533{
534	struct apm_softc *sc = arg;
535
536	apm_processevent(sc);
537	if (sc->active == 1) {
538		timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
539	}
540}
541
542/* enable APM BIOS */
543static void
544apm_event_enable(struct apm_softc *sc)
545{
546#ifdef APM_DEBUG
547	printf("called apm_event_enable()\n");
548#endif
549	if (sc->initialized) {
550		sc->active = 1;
551		apm_timeout(sc);
552	}
553}
554
555/* disable APM BIOS */
556static void
557apm_event_disable(struct apm_softc *sc)
558{
559#ifdef APM_DEBUG
560	printf("called apm_event_disable()\n");
561#endif
562	if (sc->initialized) {
563		untimeout(apm_timeout, NULL);
564		sc->active = 0;
565	}
566}
567
568/* halt CPU in scheduling loop */
569static void
570apm_halt_cpu(struct apm_softc *sc)
571{
572	if (sc->initialized) {
573		sc->always_halt_cpu = 1;
574	}
575}
576
577/* don't halt CPU in scheduling loop */
578static void
579apm_not_halt_cpu(struct apm_softc *sc)
580{
581	if (sc->initialized) {
582		sc->always_halt_cpu = 0;
583	}
584}
585
586/* device driver definitions */
587static int apmprobe (struct isa_device *);
588static int apmattach(struct isa_device *);
589struct isa_driver apmdriver = {
590	apmprobe, apmattach, "apm" };
591
592/*
593 * probe APM (dummy):
594 *
595 * APM probing routine is placed on locore.s and apm_init.S because
596 * this process forces the CPU to turn to real mode or V86 mode.
597 * Current version uses real mode, but on future version, we want
598 * to use V86 mode in APM initialization.
599 */
600
601static int
602apmprobe(struct isa_device *dvp)
603{
604	if ( dvp->id_unit > 0 ) {
605		printf("apm: Only one APM driver supported.\n");
606		return 0;
607	}
608	apm_registerdev(dvp);
609	switch (apm_version) {
610	case APMINI_CANTFIND:
611		/* silent */
612		return 0;
613	case APMINI_NOT32BIT:
614		printf("apm: 32bit connection is not supported.\n");
615		return 0;
616	case APMINI_CONNECTERR:
617		printf("apm: 32-bit connection error.\n");
618		return 0;
619	}
620
621	return -1;
622}
623
624
625/* Process APM event */
626static void
627apm_processevent(struct apm_softc *sc)
628{
629	int apm_event;
630
631#ifdef APM_DEBUG
632#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
633	printf("Received APM Event: " #symbol "\n");
634#else
635#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
636#endif
637	do {
638		apm_event = apm_getevent(sc);
639		switch (apm_event) {
640		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
641			apm_suspend();
642			break;
643		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
644			apm_suspend();
645			break;
646		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
647			apm_suspend();
648			break;
649		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
650			apm_suspend();
651			break;
652		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
653			apm_resume();
654			break;
655		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
656			apm_resume();
657			break;
658		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
659			apm_resume();
660			break;
661		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
662			apm_battery_low(sc);
663			apm_suspend();
664			break;
665		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
666			break;
667		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
668			inittodr(0);	/* adjust time to RTC */
669			break;
670		    OPMEV_DEBUGMESSAGE(PMEV_NOEVENT);
671			break;
672		    default:
673			printf("Unknown Original APM Event 0x%x\n", apm_event);
674			    break;
675		}
676	} while (apm_event != PMEV_NOEVENT);
677}
678
679/*
680 * Attach APM:
681 *
682 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
683 */
684
685static int
686apmattach(struct isa_device *dvp)
687{
688#define APM_KERNBASE	KERNBASE
689	struct apm_softc	*sc = &apm_softc;
690
691	sc->initialized = 0;
692
693	/* Must be externally enabled */
694	sc->active = 0;
695
696	/* setup APM parameters */
697	sc->cs16_base = (apm_cs32_base << 4) + APM_KERNBASE;
698	sc->cs32_base = (apm_cs16_base << 4) + APM_KERNBASE;
699	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
700	sc->cs_limit = apm_cs_limit;
701	sc->ds_limit = apm_ds_limit;
702	sc->cs_entry = apm_cs_entry;
703
704	/* Always call HLT in idle loop */
705	sc->always_halt_cpu = 1;
706
707	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
708	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
709	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
710
711	/* print bootstrap messages */
712#ifdef APM_DEBUG
713	printf("apm: APM BIOS version %04x\n",  apm_version);
714	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
715		sc->cs32_base, sc->cs16_base, sc->ds_base);
716	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
717		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
718		is_enabled(!sc->disabled));
719	printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
720#endif /* APM_DEBUG */
721
722	/* Workaround for some buggy APM BIOS implementations */
723	sc->cs_limit = 0xffff;
724	sc->ds_limit = 0xffff;
725
726	/* setup GDT */
727	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
728			sc->cs_limit, sc->ds_limit);
729
730	/* setup entry point 48bit pointer */
731	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
732	apm_addr.offset  = sc->cs_entry;
733
734	/* Try to kick bios into 1.1 or greater mode */
735	apm_driver_version();
736	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
737			((apm_version & 0x000f) >> 0);
738	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
739			((apm_version & 0x0f00) >> 8);
740
741	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
742
743	if (sc->intversion >= INTVERSION(1, 1)) {
744#ifdef APM_DEBUG
745		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
746#endif
747	}
748
749	printf("apm: found APM BIOS version %d.%d\n",
750		sc->majorversion, sc->minorversion);
751#ifdef APM_DEBUG
752	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
753#endif
754
755	/* enable power management */
756	if (sc->disabled) {
757		if (apm_enable_disable_pm(sc, 1)) {
758#ifdef APM_DEBUG
759			printf("apm: *Warning* enable function failed! [%x]\n",
760				apm_errno);
761#endif
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#ifdef APM_DEBUG
769			printf("apm: *Warning* engage function failed err=[%x]",
770				apm_errno);
771			printf(" (Docked or using external power?).\n");
772#endif
773		}
774	}
775
776        /* default suspend hook */
777        sc->sc_suspend.ah_fun = apm_default_suspend;
778        sc->sc_suspend.ah_arg = sc;
779        sc->sc_suspend.ah_name = "default suspend";
780        sc->sc_suspend.ah_order = APM_MAX_ORDER;
781
782        /* default resume hook */
783        sc->sc_resume.ah_fun = apm_default_resume;
784        sc->sc_resume.ah_arg = sc;
785        sc->sc_resume.ah_name = "default resume";
786        sc->sc_resume.ah_order = APM_MIN_ORDER;
787
788        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
789        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
790
791	apm_event_enable(sc);
792	kdc_apm.kdc_state = DC_IDLE;
793
794	sc->initialized = 1;
795
796#ifdef DEVFS
797	sc->sc_devfs_token =
798		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
799#endif
800	return 0;
801}
802
803static int
804apmopen(dev_t dev, int flag, int fmt, struct proc *p)
805{
806	struct apm_softc *sc = &apm_softc;
807
808	if (minor(dev) != 0 || !sc->initialized)
809		return (ENXIO);
810
811	return 0;
812}
813
814static int
815apmclose(dev_t dev, int flag, int fmt, struct proc *p)
816{
817	return 0;
818}
819
820static int
821apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
822{
823	struct apm_softc *sc = &apm_softc;
824	int error = 0;
825
826	if (minor(dev) != 0 || !sc->initialized)
827		return (ENXIO);
828#ifdef APM_DEBUG
829	printf("APM ioctl: cmd = 0x%x\n", cmd);
830#endif
831	switch (cmd) {
832	case APMIO_SUSPEND:
833		if ( sc->active) {
834			apm_suspend();
835		} else {
836			error = EINVAL;
837		}
838		break;
839	case APMIO_GETINFO:
840		if (apm_get_info(sc, (apm_info_t)addr)) {
841			error = ENXIO;
842		}
843		break;
844	case APMIO_ENABLE:
845		kdc_apm.kdc_state = DC_BUSY;
846		apm_event_enable(sc);
847		break;
848	case APMIO_DISABLE:
849		kdc_apm.kdc_state = DC_IDLE;
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