358c60267cdf5515861a0b7a81b10581d01e555f
[dragonfly.git] / sys / platform / pc64 / apm / apm.c
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  * $FreeBSD: src/sys/i386/apm/apm.c,v 1.114.2.5 2002/11/02 04:41:50 iwasaki Exp $
19  * $DragonFly: src/sys/platform/pc32/apm/apm.c,v 1.21 2006/12/23 00:27:03 swildner Exp $
20  */
21
22 #include <sys/param.h>
23 #include <sys/systm.h>
24 #include <sys/eventhandler.h>
25 #include <sys/conf.h>
26 #include <sys/device.h>
27 #include <sys/kernel.h>
28 #include <sys/time.h>
29 #include <sys/reboot.h>
30 #include <sys/bus.h>
31 #include <sys/selinfo.h>
32 #include <sys/poll.h>
33 #include <sys/fcntl.h>
34 #include <sys/uio.h>
35 #include <sys/signalvar.h>
36 #include <sys/sysctl.h>
37 #include <machine/apm_bios.h>
38 #include <machine/segments.h>
39 #include <machine/clock.h>
40 #include <vm/vm.h>
41 #include <vm/vm_param.h>
42 #include <vm/pmap.h>
43 #include <sys/syslog.h>
44 #include <sys/thread2.h>
45
46 #include <machine/pc/bios.h>
47 #include <machine/vm86.h>
48
49 #include <machine_base/apm/apm.h>
50
51 /* Used by the apm_saver screen saver module */
52 int apm_display (int newstate);
53 struct apm_softc apm_softc;
54
55 static void apm_resume (void);
56 static int apm_bioscall(void);
57 static int apm_check_function_supported (u_int version, u_int func);
58
59 static u_long   apm_version;
60
61 int     apm_evindex;
62
63 #define SCFLAG_ONORMAL  0x0000001
64 #define SCFLAG_OCTL     0x0000002
65 #define SCFLAG_OPEN     (SCFLAG_ONORMAL|SCFLAG_OCTL)
66
67 #define APMDEV(dev)     (minor(dev)&0x0f)
68 #define APMDEV_NORMAL   0
69 #define APMDEV_CTL      8
70
71 static struct apmhook   *hook[NAPM_HOOK];               /* XXX */
72
73 #define is_enabled(foo) ((foo) ? "enabled" : "disabled")
74
75 /* Map version number to integer (keeps ordering of version numbers) */
76 #define INTVERSION(major, minor)        ((major)*100 + (minor))
77
78 static struct callout apm_timeout_ch;
79
80 static timeout_t apm_timeout;
81 static d_open_t apmopen;
82 static d_close_t apmclose;
83 static d_write_t apmwrite;
84 static d_ioctl_t apmioctl;
85 static d_poll_t apmpoll;
86
87 #define CDEV_MAJOR 39
88 static struct dev_ops apm_ops = {
89         { "apm", CDEV_MAJOR, 0 },
90         .d_open =       apmopen,
91         .d_close =      apmclose,
92         .d_write =      apmwrite,
93         .d_ioctl =      apmioctl,
94         .d_poll =       apmpoll,
95 };
96
97 static int apm_suspend_delay = 1;
98 static int apm_standby_delay = 1;
99 static int apm_debug = 0;
100
101 #define APM_DPRINT(args...) do  {                                       \
102         if (apm_debug) {                                                \
103                 kprintf(args);                                          \
104         }                                                               \
105 } while (0)
106
107 SYSCTL_INT(_machdep, OID_AUTO, apm_suspend_delay, CTLFLAG_RW, &apm_suspend_delay, 1, "");
108 SYSCTL_INT(_machdep, OID_AUTO, apm_standby_delay, CTLFLAG_RW, &apm_standby_delay, 1, "");
109 SYSCTL_INT(_debug, OID_AUTO, apm_debug, CTLFLAG_RW, &apm_debug, 0, "");
110
111 /*
112  * return  0 if the function successfull,
113  * return  1 if the function unsuccessfull,
114  * return -1 if the function unsupported.
115  */
116 static int
117 apm_bioscall(void)
118 {
119         struct apm_softc *sc = &apm_softc;
120         int error = 0;
121         u_int apm_func = sc->bios.r.eax & 0xff;
122
123         if (!apm_check_function_supported(sc->intversion, apm_func)) {
124                 APM_DPRINT("apm_bioscall: function 0x%x is not supported in v%d.%d\n",
125                     apm_func, sc->majorversion, sc->minorversion);
126                 return (-1);
127         }
128
129         sc->bios_busy = 1;
130         if (sc->connectmode == APM_PROT32CONNECT) {
131                 set_bios_selectors(&sc->bios.seg,
132                                    BIOSCODE_FLAG | BIOSDATA_FLAG);
133                 error = bios32(&sc->bios.r,
134                                sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL));
135         } else {
136                 error = bios16(&sc->bios, NULL);
137         }
138         sc->bios_busy = 0;
139         return (error);
140 }
141
142 /* check whether APM function is supported (1)  or not (0). */
143 static int
144 apm_check_function_supported(u_int version, u_int func)
145 {
146         /* except driver version */
147         if (func == APM_DRVVERSION) {
148                 return (1);
149         }
150
151         switch (version) {
152         case INTVERSION(1, 0):
153                 if (func > APM_GETPMEVENT) {
154                         return (0); /* not supported */
155                 }
156                 break;
157         case INTVERSION(1, 1):
158                 if (func > APM_ENGAGEDISENGAGEPM &&
159                     func < APM_OEMFUNC) {
160                         return (0); /* not supported */
161                 }
162                 break;
163         case INTVERSION(1, 2):
164                 break;
165         }
166
167         return (1); /* supported */
168 }
169
170 /* enable/disable power management */
171 static int
172 apm_enable_disable_pm(int enable)
173 {
174         struct apm_softc *sc = &apm_softc;
175
176         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
177
178         if (sc->intversion >= INTVERSION(1, 1))
179                 sc->bios.r.ebx  = PMDV_ALLDEV;
180         else
181                 sc->bios.r.ebx  = 0xffff;       /* APM version 1.0 only */
182         sc->bios.r.ecx  = enable;
183         sc->bios.r.edx = 0;
184         return (apm_bioscall());
185 }
186
187 /* register driver version (APM 1.1 or later) */
188 static int
189 apm_driver_version(int version)
190 {
191         struct apm_softc *sc = &apm_softc;
192
193         sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION;
194         sc->bios.r.ebx  = 0x0;
195         sc->bios.r.ecx  = version;
196         sc->bios.r.edx = 0;
197
198         if (apm_bioscall() == 0 && sc->bios.r.eax == version)
199                 return (0);
200
201         /* Some old BIOSes don't return the connection version in %ax. */
202         if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION))
203                 return (0);
204
205         return (1);
206 }
207
208 /* engage/disengage power management (APM 1.1 or later) */
209 static int
210 apm_engage_disengage_pm(int engage)
211 {
212         struct apm_softc *sc = &apm_softc;
213
214         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
215         sc->bios.r.ebx = PMDV_ALLDEV;
216         sc->bios.r.ecx = engage;
217         sc->bios.r.edx = 0;
218         return (apm_bioscall());
219 }
220
221 /* get PM event */
222 static u_int
223 apm_getevent(void)
224 {
225         struct apm_softc *sc = &apm_softc;
226
227         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT;
228
229         sc->bios.r.ebx = 0;
230         sc->bios.r.ecx = 0;
231         sc->bios.r.edx = 0;
232         if (apm_bioscall())
233                 return (PMEV_NOEVENT);
234         return (sc->bios.r.ebx & 0xffff);
235 }
236
237 /* suspend entire system */
238 static int
239 apm_suspend_system(int state)
240 {
241         struct apm_softc *sc = &apm_softc;
242
243         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
244         sc->bios.r.ebx = PMDV_ALLDEV;
245         sc->bios.r.ecx = state;
246         sc->bios.r.edx = 0;
247
248         if (apm_bioscall()) {
249                 kprintf("Entire system suspend failure: errcode = %d\n",
250                         0xff & (sc->bios.r.eax >> 8));
251                 return 1;
252         }
253         return 0;
254 }
255
256 /* Display control */
257 /*
258  * Experimental implementation: My laptop machine can't handle this function
259  * If your laptop can control the display via APM, please inform me.
260  *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
261  */
262 int
263 apm_display(int newstate)
264 {
265         struct apm_softc *sc = &apm_softc;
266
267         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
268         sc->bios.r.ebx = PMDV_DISP0;
269         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
270         sc->bios.r.edx = 0;
271         if (apm_bioscall() == 0) {
272                 return 0;
273         }
274
275         /* If failed, then try to blank all display devices instead. */
276         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
277         sc->bios.r.ebx = PMDV_DISPALL;  /* all display devices */
278         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
279         sc->bios.r.edx = 0;
280         if (apm_bioscall() == 0) {
281                 return 0;
282         }
283         kprintf("Display off failure: errcode = %d\n",
284                0xff & (sc->bios.r.eax >> 8));
285         return 1;
286 }
287
288 /*
289  * Turn off the entire system.
290  */
291 static void
292 apm_power_off(void *junk, int howto)
293 {
294         struct apm_softc *sc = &apm_softc;
295
296         /* Not halting powering off, or not active */
297         if (!(howto & RB_POWEROFF) || !apm_softc.active)
298                 return;
299         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
300         sc->bios.r.ebx = PMDV_ALLDEV;
301         sc->bios.r.ecx = PMST_OFF;
302         sc->bios.r.edx = 0;
303         apm_bioscall();
304 }
305
306 /* APM Battery low handler */
307 static void
308 apm_battery_low(void)
309 {
310         kprintf("\007\007 * * * BATTERY IS LOW * * * \007\007");
311 }
312
313 /* APM hook manager */
314 static struct apmhook *
315 apm_add_hook(struct apmhook **list, struct apmhook *ah)
316 {
317         struct apmhook *p, *prev;
318
319         APM_DPRINT("Add hook \"%s\"\n", ah->ah_name);
320
321         crit_enter();
322         if (ah == NULL)
323                 panic("illegal apm_hook!");
324         prev = NULL;
325         for (p = *list; p != NULL; prev = p, p = p->ah_next)
326                 if (p->ah_order > ah->ah_order)
327                         break;
328
329         if (prev == NULL) {
330                 ah->ah_next = *list;
331                 *list = ah;
332         } else {
333                 ah->ah_next = prev->ah_next;
334                 prev->ah_next = ah;
335         }
336         crit_exit();
337         return ah;
338 }
339
340 static void
341 apm_del_hook(struct apmhook **list, struct apmhook *ah)
342 {
343         struct apmhook *p, *prev;
344
345         crit_enter();
346         prev = NULL;
347         for (p = *list; p != NULL; prev = p, p = p->ah_next)
348                 if (p == ah)
349                         goto deleteit;
350         panic("Tried to delete unregistered apm_hook.");
351         goto nosuchnode;
352 deleteit:
353         if (prev != NULL)
354                 prev->ah_next = p->ah_next;
355         else
356                 *list = p->ah_next;
357 nosuchnode:
358         crit_exit();
359 }
360
361
362 /* APM driver calls some functions automatically */
363 static void
364 apm_execute_hook(struct apmhook *list)
365 {
366         struct apmhook *p;
367
368         for (p = list; p != NULL; p = p->ah_next) {
369                 APM_DPRINT("Execute APM hook \"%s.\"\n", p->ah_name);
370                 if ((*(p->ah_fun))(p->ah_arg))
371                         kprintf("Warning: APM hook \"%s\" failed", p->ah_name);
372         }
373 }
374
375
376 /* establish an apm hook */
377 struct apmhook *
378 apm_hook_establish(int apmh, struct apmhook *ah)
379 {
380         if (apmh < 0 || apmh >= NAPM_HOOK)
381                 return NULL;
382
383         return apm_add_hook(&hook[apmh], ah);
384 }
385
386 /* disestablish an apm hook */
387 void
388 apm_hook_disestablish(int apmh, struct apmhook *ah)
389 {
390         if (apmh < 0 || apmh >= NAPM_HOOK)
391                 return;
392
393         apm_del_hook(&hook[apmh], ah);
394 }
395
396
397 static struct timeval suspend_time;
398 static struct timeval diff_time;
399
400 static int
401 apm_default_resume(void *arg)
402 {
403         u_int second, minute, hour;
404         struct timeval resume_time, tmp_time;
405
406         /* modified for adjkerntz */
407         crit_enter();
408         timer_restore();                /* restore the all timers */
409         inittodr(0);                    /* adjust time to RTC */
410         microtime(&resume_time);
411         getmicrotime(&tmp_time);
412         timevaladd(&tmp_time, &diff_time);
413
414 #ifdef FIXME
415         /* XXX THIS DOESN'T WORK!!! */
416         time = tmp_time;
417 #endif
418
419 #ifdef APM_FIXUP_CALLTODO
420         /* Calculate the delta time suspended */
421         timevalsub(&resume_time, &suspend_time);
422         /* Fixup the calltodo list with the delta time. */
423         adjust_timeout_calltodo(&resume_time);
424 #endif /* APM_FIXUP_CALLTODOK */
425         crit_exit();
426 #ifndef APM_FIXUP_CALLTODO
427         second = resume_time.tv_sec - suspend_time.tv_sec;
428 #else /* APM_FIXUP_CALLTODO */
429         /*
430          * We've already calculated resume_time to be the delta between
431          * the suspend and the resume.
432          */
433         second = resume_time.tv_sec;
434 #endif /* APM_FIXUP_CALLTODO */
435         hour = second / 3600;
436         second %= 3600;
437         minute = second / 60;
438         second %= 60;
439         log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
440                 hour, minute, second);
441         return 0;
442 }
443
444 static int
445 apm_default_suspend(void *arg)
446 {
447         crit_enter();
448         microtime(&diff_time);
449         inittodr(0);
450         microtime(&suspend_time);
451         timevalsub(&diff_time, &suspend_time);
452         crit_exit();
453         return 0;
454 }
455
456 static int apm_record_event (struct apm_softc *, u_int);
457 static void apm_processevent(void);
458
459 static u_int apm_op_inprog = 0;
460
461 static void
462 apm_do_suspend(void)
463 {
464         struct apm_softc *sc = &apm_softc;
465         int error;
466
467         if (!sc)
468                 return;
469
470         apm_op_inprog = 0;
471         sc->suspends = sc->suspend_countdown = 0;
472
473         if (sc->initialized) {
474                 error = DEVICE_SUSPEND(root_bus);
475                 if (error) {
476                         DEVICE_RESUME(root_bus);
477                 } else {
478                         apm_execute_hook(hook[APM_HOOK_SUSPEND]);
479                         if (apm_suspend_system(PMST_SUSPEND) == 0) {
480                                 apm_processevent();
481                         } else {
482                                 /* Failure, 'resume' the system again */
483                                 apm_execute_hook(hook[APM_HOOK_RESUME]);
484                                 DEVICE_RESUME(root_bus);
485                         }
486                 }
487         }
488 }
489
490 static void
491 apm_do_standby(void)
492 {
493         struct apm_softc *sc = &apm_softc;
494
495         if (!sc)
496                 return;
497
498         apm_op_inprog = 0;
499         sc->standbys = sc->standby_countdown = 0;
500
501         if (sc->initialized) {
502                 /*
503                  * As far as standby, we don't need to execute
504                  * all of suspend hooks.
505                  */
506                 apm_default_suspend(&apm_softc);
507                 if (apm_suspend_system(PMST_STANDBY) == 0)
508                         apm_processevent();
509         }
510 }
511
512 static void
513 apm_lastreq_notify(void)
514 {
515         struct apm_softc *sc = &apm_softc;
516
517         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
518         sc->bios.r.ebx = PMDV_ALLDEV;
519         sc->bios.r.ecx = PMST_LASTREQNOTIFY;
520         sc->bios.r.edx = 0;
521         apm_bioscall();
522 }
523
524 static int
525 apm_lastreq_rejected(void)
526 {
527         struct apm_softc *sc = &apm_softc;
528
529         if (apm_op_inprog == 0) {
530                 return 1;       /* no operation in progress */
531         }
532
533         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
534         sc->bios.r.ebx = PMDV_ALLDEV;
535         sc->bios.r.ecx = PMST_LASTREQREJECT;
536         sc->bios.r.edx = 0;
537
538         if (apm_bioscall()) {
539                 APM_DPRINT("apm_lastreq_rejected: failed\n");
540                 return 1;
541         }
542         apm_op_inprog = 0;
543         return 0;
544 }
545
546 /*
547  * Public interface to the suspend/resume:
548  *
549  * Execute suspend and resume hook before and after sleep, respectively.
550  *
551  */
552
553 void
554 apm_suspend(int state)
555 {
556         struct apm_softc *sc = &apm_softc;
557
558         if (!sc->initialized)
559                 return;
560
561         switch (state) {
562         case PMST_SUSPEND:
563                 if (sc->suspends)
564                         return;
565                 sc->suspends++;
566                 sc->suspend_countdown = apm_suspend_delay;
567                 break;
568         case PMST_STANDBY:
569                 if (sc->standbys)
570                         return;
571                 sc->standbys++;
572                 sc->standby_countdown = apm_standby_delay;
573                 break;
574         default:
575                 kprintf("apm_suspend: Unknown Suspend state 0x%x\n", state);
576                 return;
577         }
578
579         apm_op_inprog++;
580         apm_lastreq_notify();
581 }
582
583 void
584 apm_resume(void)
585 {
586         struct apm_softc *sc = &apm_softc;
587
588         if (!sc)
589                 return;
590
591         if (sc->initialized) {
592                 apm_execute_hook(hook[APM_HOOK_RESUME]);
593                 DEVICE_RESUME(root_bus);
594         }
595 }
596
597
598 /* get power status per battery */
599 static int
600 apm_get_pwstatus(apm_pwstatus_t app)
601 {
602         struct apm_softc *sc = &apm_softc;
603
604         if (app->ap_device != PMDV_ALLDEV &&
605             (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
606                 return 1;
607
608         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
609         sc->bios.r.ebx = app->ap_device;
610         sc->bios.r.ecx = 0;
611         sc->bios.r.edx = 0xffff;        /* default to unknown battery time */
612
613         if (apm_bioscall())
614                 return 1;
615
616         app->ap_acline    = (sc->bios.r.ebx >> 8) & 0xff;
617         app->ap_batt_stat = sc->bios.r.ebx & 0xff;
618         app->ap_batt_flag = (sc->bios.r.ecx >> 8) & 0xff;
619         app->ap_batt_life = sc->bios.r.ecx & 0xff;
620         sc->bios.r.edx &= 0xffff;
621         if (sc->bios.r.edx == 0xffff)   /* Time is unknown */
622                 app->ap_batt_time = -1;
623         else if (sc->bios.r.edx & 0x8000)       /* Time is in minutes */
624                 app->ap_batt_time = (sc->bios.r.edx & 0x7fff) * 60;
625         else                            /* Time is in seconds */
626                 app->ap_batt_time = sc->bios.r.edx;
627
628         return 0;
629 }
630
631
632 /* get APM information */
633 static int
634 apm_get_info(apm_info_t aip)
635 {
636         struct apm_softc *sc = &apm_softc;
637         struct apm_pwstatus aps;
638
639         bzero(&aps, sizeof(aps));
640         aps.ap_device = PMDV_ALLDEV;
641         if (apm_get_pwstatus(&aps))
642                 return 1;
643
644         aip->ai_infoversion = 1;
645         aip->ai_acline      = aps.ap_acline;
646         aip->ai_batt_stat   = aps.ap_batt_stat;
647         aip->ai_batt_life   = aps.ap_batt_life;
648         aip->ai_batt_time   = aps.ap_batt_time;
649         aip->ai_major       = (u_int)sc->majorversion;
650         aip->ai_minor       = (u_int)sc->minorversion;
651         aip->ai_status      = (u_int)sc->active;
652
653         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES;
654         sc->bios.r.ebx = 0;
655         sc->bios.r.ecx = 0;
656         sc->bios.r.edx = 0;
657         if (apm_bioscall()) {
658                 aip->ai_batteries = -1; /* Unknown */
659                 aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */
660         } else {
661                 aip->ai_batteries = sc->bios.r.ebx & 0xff;
662                 aip->ai_capabilities = sc->bios.r.ecx & 0xf;
663         }
664
665         bzero(aip->ai_spare, sizeof aip->ai_spare);
666
667         return 0;
668 }
669
670
671 /* inform APM BIOS that CPU is idle */
672 void
673 apm_cpu_idle(void)
674 {
675         struct apm_softc *sc = &apm_softc;
676
677         if (sc->active) {
678
679                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE;
680                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
681                 apm_bioscall();
682         }
683         /*
684          * Some APM implementation halts CPU in BIOS, whenever
685          * "CPU-idle" function are invoked, but swtch() of
686          * FreeBSD halts CPU, therefore, CPU is halted twice
687          * in the sched loop. It makes the interrupt latency
688          * terribly long and be able to cause a serious problem
689          * in interrupt processing. We prevent it by removing
690          * "hlt" operation from swtch() and managed it under
691          * APM driver.
692          */
693         if (!sc->active || sc->always_halt_cpu)
694                 __asm("hlt");   /* wait for interrupt */
695 }
696
697 /* inform APM BIOS that CPU is busy */
698 void
699 apm_cpu_busy(void)
700 {
701         struct apm_softc *sc = &apm_softc;
702
703         /*
704          * The APM specification says this is only necessary if your BIOS
705          * slows down the processor in the idle task, otherwise it's not
706          * necessary.
707          */
708         if (sc->slow_idle_cpu && sc->active) {
709
710                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY;
711                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
712                 apm_bioscall();
713         }
714 }
715
716
717 /*
718  * APM timeout routine:
719  *
720  * This routine is automatically called by timer once per second.
721  */
722
723 static void
724 apm_timeout(void *dummy)
725 {
726         struct apm_softc *sc = &apm_softc;
727
728         if (apm_op_inprog)
729                 apm_lastreq_notify();
730
731         if (sc->standbys && sc->standby_countdown-- <= 0)
732                 apm_do_standby();
733
734         if (sc->suspends && sc->suspend_countdown-- <= 0)
735                 apm_do_suspend();
736
737         if (!sc->bios_busy)
738                 apm_processevent();
739
740         if (sc->active == 1) {
741                 /* Run slightly more oftan than 1 Hz */
742                 callout_reset(&apm_timeout_ch, hz - 1, apm_timeout, NULL);
743         }
744 }
745
746 /* enable APM BIOS */
747 static void
748 apm_event_enable(void)
749 {
750         struct apm_softc *sc = &apm_softc;
751
752         APM_DPRINT("called apm_event_enable()\n");
753         if (sc->initialized) {
754                 sc->active = 1;
755                 callout_init(&apm_timeout_ch);
756                 apm_timeout(sc);
757         }
758 }
759
760 /* disable APM BIOS */
761 static void
762 apm_event_disable(void)
763 {
764         struct apm_softc *sc = &apm_softc;
765
766         APM_DPRINT("called apm_event_disable()\n");
767         if (sc->initialized) {
768                 callout_stop(&apm_timeout_ch);
769                 sc->active = 0;
770         }
771 }
772
773 /* halt CPU in scheduling loop */
774 static void
775 apm_halt_cpu(void)
776 {
777         struct apm_softc *sc = &apm_softc;
778
779         if (sc->initialized)
780                 sc->always_halt_cpu = 1;
781 }
782
783 /* don't halt CPU in scheduling loop */
784 static void
785 apm_not_halt_cpu(void)
786 {
787         struct apm_softc *sc = &apm_softc;
788
789         if (sc->initialized)
790                 sc->always_halt_cpu = 0;
791 }
792
793 /* device driver definitions */
794
795 /*
796  * probe for APM BIOS
797  */
798 static int
799 apm_probe(device_t dev)
800 {
801 #define APM_KERNBASE    KERNBASE
802         struct vm86frame        vmf;
803         struct apm_softc        *sc = &apm_softc;
804         int                     disabled, flags;
805
806         if (resource_int_value("apm", 0, "disabled", &disabled) == 0
807             && disabled != 0)
808                 return ENXIO;
809
810         device_set_desc(dev, "APM BIOS");
811
812         if ( device_get_unit(dev) > 0 ) {
813                 kprintf("apm: Only one APM driver supported.\n");
814                 return ENXIO;
815         }
816
817         if (resource_int_value("apm", 0, "flags", &flags) != 0)
818                 flags = 0;
819
820         bzero(&vmf, sizeof(struct vm86frame));          /* safety */
821         bzero(&apm_softc, sizeof(apm_softc));
822         vmf.vmf_ah = APM_BIOS;
823         vmf.vmf_al = APM_INSTCHECK;
824         vmf.vmf_bx = 0;
825         if (vm86_intcall(APM_INT, &vmf))
826                 return ENXIO;                   /* APM not found */
827         if (vmf.vmf_bx != 0x504d) {
828                 kprintf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx);
829                 return ENXIO;
830         }
831         if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) {
832                 kprintf("apm: protected mode connections are not supported\n");
833                 return ENXIO;
834         }
835
836         apm_version = vmf.vmf_ax;
837         sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0);
838         sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0);
839         sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0);
840
841         vmf.vmf_ah = APM_BIOS;
842         vmf.vmf_al = APM_DISCONNECT;
843         vmf.vmf_bx = 0;
844         vm86_intcall(APM_INT, &vmf);            /* disconnect, just in case */
845
846         if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) {
847                 vmf.vmf_ah = APM_BIOS;
848                 vmf.vmf_al = APM_PROT32CONNECT;
849                 vmf.vmf_bx = 0;
850                 if (vm86_intcall(APM_INT, &vmf)) {
851                         kprintf("apm: 32-bit connection error.\n");
852                         return (ENXIO);
853                 }
854                 sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
855                 sc->bios.seg.code32.limit = 0xffff;
856                 sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
857                 sc->bios.seg.code16.limit = 0xffff;
858                 sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
859                 sc->bios.seg.data.limit = 0xffff;
860                 sc->bios.entry = vmf.vmf_ebx;
861                 sc->connectmode = APM_PROT32CONNECT;
862         } else {
863                 /* use 16-bit connection */
864                 vmf.vmf_ah = APM_BIOS;
865                 vmf.vmf_al = APM_PROT16CONNECT;
866                 vmf.vmf_bx = 0;
867                 if (vm86_intcall(APM_INT, &vmf)) {
868                         kprintf("apm: 16-bit connection error.\n");
869                         return (ENXIO);
870                 }
871                 sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
872                 sc->bios.seg.code16.limit = 0xffff;
873                 sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
874                 sc->bios.seg.data.limit = 0xffff;
875                 sc->bios.entry = vmf.vmf_bx;
876                 sc->connectmode = APM_PROT16CONNECT;
877         }
878         return(0);
879 }
880
881
882 /*
883  * return 0 if the user will notice and handle the event,
884  * return 1 if the kernel driver should do so.
885  */
886 static int
887 apm_record_event(struct apm_softc *sc, u_int event_type)
888 {
889         struct apm_event_info *evp;
890
891         if ((sc->sc_flags & SCFLAG_OPEN) == 0)
892                 return 1;               /* no user waiting */
893         if (sc->event_count == APM_NEVENTS)
894                 return 1;                       /* overflow */
895         if (sc->event_filter[event_type] == 0)
896                 return 1;               /* not registered */
897         evp = &sc->event_list[sc->event_ptr];
898         sc->event_count++;
899         sc->event_ptr++;
900         sc->event_ptr %= APM_NEVENTS;
901         evp->type = event_type;
902         evp->index = ++apm_evindex;
903         selwakeup(&sc->sc_rsel);
904         return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */
905 }
906
907 /* Process APM event */
908 static void
909 apm_processevent(void)
910 {
911         int apm_event;
912         struct apm_softc *sc = &apm_softc;
913
914 #define OPMEV_DEBUGMESSAGE(symbol) case symbol:                         \
915         APM_DPRINT("Received APM Event: " #symbol "\n");
916
917         do {
918                 apm_event = apm_getevent();
919                 switch (apm_event) {
920                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
921                         if (apm_op_inprog == 0) {
922                             apm_op_inprog++;
923                             if (apm_record_event(sc, apm_event)) {
924                                 apm_suspend(PMST_STANDBY);
925                             }
926                         }
927                         break;
928                     OPMEV_DEBUGMESSAGE(PMEV_USERSTANDBYREQ);
929                         if (apm_op_inprog == 0) {
930                             apm_op_inprog++;
931                             if (apm_record_event(sc, apm_event)) {
932                                 apm_suspend(PMST_STANDBY);
933                             }
934                         }
935                         break;
936                     OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
937                         apm_lastreq_notify();
938                         if (apm_op_inprog == 0) {
939                             apm_op_inprog++;
940                             if (apm_record_event(sc, apm_event)) {
941                                 apm_do_suspend();
942                             }
943                         }
944                         return; /* XXX skip the rest */
945                     OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
946                         apm_lastreq_notify();
947                         if (apm_op_inprog == 0) {
948                             apm_op_inprog++;
949                             if (apm_record_event(sc, apm_event)) {
950                                 apm_do_suspend();
951                             }
952                         }
953                         return; /* XXX skip the rest */
954                     OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
955                         apm_do_suspend();
956                         break;
957                     OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
958                         apm_record_event(sc, apm_event);
959                         apm_resume();
960                         break;
961                     OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
962                         apm_record_event(sc, apm_event);
963                         apm_resume();
964                         break;
965                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
966                         apm_record_event(sc, apm_event);
967                         apm_resume();
968                         break;
969                     OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
970                         if (apm_record_event(sc, apm_event)) {
971                             apm_battery_low();
972                             apm_suspend(PMST_SUSPEND);
973                         }
974                         break;
975                     OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
976                         apm_record_event(sc, apm_event);
977                         break;
978                     OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
979                         apm_record_event(sc, apm_event);
980                         inittodr(0);    /* adjust time to RTC */
981                         break;
982                     OPMEV_DEBUGMESSAGE(PMEV_CAPABILITIESCHANGE);
983                         apm_record_event(sc, apm_event);
984                         break;
985                     case PMEV_NOEVENT:
986                         break;
987                     default:
988                         kprintf("Unknown Original APM Event 0x%x\n", apm_event);
989                             break;
990                 }
991         } while (apm_event != PMEV_NOEVENT);
992 }
993
994 /*
995  * Attach APM:
996  *
997  * Initialize APM driver
998  */
999
1000 static int
1001 apm_attach(device_t dev)
1002 {
1003         struct apm_softc        *sc = &apm_softc;
1004         int                     flags;
1005         int                     drv_version;
1006
1007         if (resource_int_value("apm", 0, "flags", &flags) != 0)
1008                 flags = 0;
1009
1010         sc->initialized = 0;
1011
1012         /* Must be externally enabled */
1013         sc->active = 0;
1014
1015         /* Always call HLT in idle loop */
1016         sc->always_halt_cpu = 1;
1017
1018         kgetenv_int("debug.apm_debug", &apm_debug);
1019
1020         /* print bootstrap messages */
1021         APM_DPRINT("apm: APM BIOS version %04lx\n",  apm_version);
1022         APM_DPRINT("apm: Code16 0x%08x, Data 0x%08x\n",
1023             sc->bios.seg.code16.base, sc->bios.seg.data.base);
1024         APM_DPRINT("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
1025             sc->bios.entry, is_enabled(sc->slow_idle_cpu),
1026             is_enabled(!sc->disabled));
1027         APM_DPRINT("apm: CS_limit=0x%x, DS_limit=0x%x\n",
1028             sc->bios.seg.code16.limit, sc->bios.seg.data.limit);
1029
1030         /*
1031          * In one test, apm bios version was 1.02; an attempt to register
1032          * a 1.04 driver resulted in a 1.00 connection!  Registering a
1033          * 1.02 driver resulted in a 1.02 connection.
1034          */
1035         drv_version = apm_version > 0x102 ? 0x102 : apm_version;
1036         for (; drv_version > 0x100; drv_version--)
1037                 if (apm_driver_version(drv_version) == 0)
1038                         break;
1039         sc->minorversion = ((drv_version & 0x00f0) >>  4) * 10 +
1040                 ((drv_version & 0x000f) >> 0);
1041         sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 +
1042                 ((apm_version & 0x0f00) >> 8);
1043
1044         sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
1045
1046         if (sc->intversion >= INTVERSION(1, 1))
1047                 APM_DPRINT("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
1048         device_printf(dev, "found APM BIOS v%ld.%ld, connected at v%d.%d\n",
1049                ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8),
1050                ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0),
1051                sc->majorversion, sc->minorversion);
1052
1053
1054         APM_DPRINT("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
1055         /* enable power management */
1056         if (sc->disabled) {
1057                 if (apm_enable_disable_pm(1)) {
1058                         APM_DPRINT("apm: *Warning* enable function failed! [%x]\n",
1059                             (sc->bios.r.eax >> 8) & 0xff);
1060                 }
1061         }
1062
1063         /* engage power managment (APM 1.1 or later) */
1064         if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
1065                 if (apm_engage_disengage_pm(1)) {
1066                         APM_DPRINT("apm: *Warning* engage function failed err=[%x]",
1067                             (sc->bios.r.eax >> 8) & 0xff);
1068                         APM_DPRINT(" (Docked or using external power?).\n");
1069                 }
1070         }
1071
1072         /* default suspend hook */
1073         sc->sc_suspend.ah_fun = apm_default_suspend;
1074         sc->sc_suspend.ah_arg = sc;
1075         sc->sc_suspend.ah_name = "default suspend";
1076         sc->sc_suspend.ah_order = APM_MAX_ORDER;
1077
1078         /* default resume hook */
1079         sc->sc_resume.ah_fun = apm_default_resume;
1080         sc->sc_resume.ah_arg = sc;
1081         sc->sc_resume.ah_name = "default resume";
1082         sc->sc_resume.ah_order = APM_MIN_ORDER;
1083
1084         apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
1085         apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
1086
1087         /* Power the system off using APM */
1088         EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL,
1089                               SHUTDOWN_PRI_LAST);
1090
1091         sc->initialized = 1;
1092
1093         dev_ops_add(&apm_ops, 0, 0);
1094         make_dev(&apm_ops, 0, UID_ROOT, GID_OPERATOR, 0660, "apm");
1095         make_dev(&apm_ops, 8, UID_ROOT, GID_OPERATOR, 0660, "apmctl");
1096         return 0;
1097 }
1098
1099 static int
1100 apmopen(struct dev_open_args *ap)
1101 {
1102         cdev_t dev = ap->a_head.a_dev;
1103         struct apm_softc *sc = &apm_softc;
1104         int ctl = APMDEV(dev);
1105
1106         if (!sc->initialized)
1107                 return (ENXIO);
1108
1109         switch (ctl) {
1110         case APMDEV_CTL:
1111                 if (!(ap->a_oflags & FWRITE))
1112                         return EINVAL;
1113                 if (sc->sc_flags & SCFLAG_OCTL)
1114                         return EBUSY;
1115                 sc->sc_flags |= SCFLAG_OCTL;
1116                 bzero(sc->event_filter, sizeof sc->event_filter);
1117                 break;
1118         case APMDEV_NORMAL:
1119                 sc->sc_flags |= SCFLAG_ONORMAL;
1120                 break;
1121         default:
1122                 return ENXIO;
1123                 break;
1124         }
1125         return 0;
1126 }
1127
1128 static int
1129 apmclose(struct dev_close_args *ap)
1130 {
1131         cdev_t dev = ap->a_head.a_dev;
1132         struct apm_softc *sc = &apm_softc;
1133         int ctl = APMDEV(dev);
1134
1135         switch (ctl) {
1136         case APMDEV_CTL:
1137                 apm_lastreq_rejected();
1138                 sc->sc_flags &= ~SCFLAG_OCTL;
1139                 bzero(sc->event_filter, sizeof sc->event_filter);
1140                 break;
1141         case APMDEV_NORMAL:
1142                 sc->sc_flags &= ~SCFLAG_ONORMAL;
1143                 break;
1144         }
1145         if ((sc->sc_flags & SCFLAG_OPEN) == 0) {
1146                 sc->event_count = 0;
1147                 sc->event_ptr = 0;
1148         }
1149         return 0;
1150 }
1151
1152 static int
1153 apmioctl(struct dev_ioctl_args *ap)
1154 {
1155         cdev_t dev = ap->a_head.a_dev;
1156         struct apm_softc *sc = &apm_softc;
1157         struct apm_bios_arg *args;
1158         int error = 0;
1159         int ret;
1160         int newstate;
1161
1162         if (!sc->initialized)
1163                 return (ENXIO);
1164         APM_DPRINT("APM ioctl: cmd = 0x%lx\n", ap->a_cmd);
1165
1166         switch (ap->a_cmd) {
1167         case APMIO_SUSPEND:
1168                 if (!(ap->a_fflag & FWRITE))
1169                         return (EPERM);
1170                 if (sc->active)
1171                         apm_suspend(PMST_SUSPEND);
1172                 else
1173                         error = EINVAL;
1174                 break;
1175
1176         case APMIO_STANDBY:
1177                 if (!(ap->a_fflag & FWRITE))
1178                         return (EPERM);
1179                 if (sc->active)
1180                         apm_suspend(PMST_STANDBY);
1181                 else
1182                         error = EINVAL;
1183                 break;
1184
1185         case APMIO_GETINFO_OLD:
1186                 {
1187                         struct apm_info info;
1188                         apm_info_old_t aiop;
1189
1190                         if (apm_get_info(&info))
1191                                 error = ENXIO;
1192                         aiop = (apm_info_old_t)ap->a_data;
1193                         aiop->ai_major = info.ai_major;
1194                         aiop->ai_minor = info.ai_minor;
1195                         aiop->ai_acline = info.ai_acline;
1196                         aiop->ai_batt_stat = info.ai_batt_stat;
1197                         aiop->ai_batt_life = info.ai_batt_life;
1198                         aiop->ai_status = info.ai_status;
1199                 }
1200                 break;
1201         case APMIO_GETINFO:
1202                 if (apm_get_info((apm_info_t)ap->a_data))
1203                         error = ENXIO;
1204                 break;
1205         case APMIO_GETPWSTATUS:
1206                 if (apm_get_pwstatus((apm_pwstatus_t)ap->a_data))
1207                         error = ENXIO;
1208                 break;
1209         case APMIO_ENABLE:
1210                 if (!(ap->a_fflag & FWRITE))
1211                         return (EPERM);
1212                 apm_event_enable();
1213                 break;
1214         case APMIO_DISABLE:
1215                 if (!(ap->a_fflag & FWRITE))
1216                         return (EPERM);
1217                 apm_event_disable();
1218                 break;
1219         case APMIO_HALTCPU:
1220                 if (!(ap->a_fflag & FWRITE))
1221                         return (EPERM);
1222                 apm_halt_cpu();
1223                 break;
1224         case APMIO_NOTHALTCPU:
1225                 if (!(ap->a_fflag & FWRITE))
1226                         return (EPERM);
1227                 apm_not_halt_cpu();
1228                 break;
1229         case APMIO_DISPLAY:
1230                 if (!(ap->a_fflag & FWRITE))
1231                         return (EPERM);
1232                 newstate = *(int *)ap->a_data;
1233                 if (apm_display(newstate))
1234                         error = ENXIO;
1235                 break;
1236         case APMIO_BIOS:
1237                 if (!(ap->a_fflag & FWRITE))
1238                         return (EPERM);
1239                 /* XXX compatibility with the old interface */
1240                 args = (struct apm_bios_arg *)ap->a_data;
1241                 sc->bios.r.eax = args->eax;
1242                 sc->bios.r.ebx = args->ebx;
1243                 sc->bios.r.ecx = args->ecx;
1244                 sc->bios.r.edx = args->edx;
1245                 sc->bios.r.esi = args->esi;
1246                 sc->bios.r.edi = args->edi;
1247                 if ((ret = apm_bioscall())) {
1248                         /*
1249                          * Return code 1 means bios call was unsuccessful.
1250                          * Error code is stored in %ah.
1251                          * Return code -1 means bios call was unsupported
1252                          * in the APM BIOS version.
1253                          */
1254                         if (ret == -1) {
1255                                 error = EINVAL;
1256                         }
1257                 } else {
1258                         /*
1259                          * Return code 0 means bios call was successful.
1260                          * We need only %al and can discard %ah.
1261                          */
1262                         sc->bios.r.eax &= 0xff;
1263                 }
1264                 args->eax = sc->bios.r.eax;
1265                 args->ebx = sc->bios.r.ebx;
1266                 args->ecx = sc->bios.r.ecx;
1267                 args->edx = sc->bios.r.edx;
1268                 args->esi = sc->bios.r.esi;
1269                 args->edi = sc->bios.r.edi;
1270                 break;
1271         default:
1272                 error = EINVAL;
1273                 break;
1274         }
1275
1276         /* for /dev/apmctl */
1277         if (APMDEV(dev) == APMDEV_CTL) {
1278                 struct apm_event_info *evp;
1279                 int i;
1280
1281                 error = 0;
1282                 switch (ap->a_cmd) {
1283                 case APMIO_NEXTEVENT:
1284                         if (!sc->event_count) {
1285                                 error = EAGAIN;
1286                         } else {
1287                                 evp = (struct apm_event_info *)ap->a_data;
1288                                 i = sc->event_ptr + APM_NEVENTS - sc->event_count;
1289                                 i %= APM_NEVENTS;
1290                                 *evp = sc->event_list[i];
1291                                 sc->event_count--;
1292                         }
1293                         break;
1294                 case APMIO_REJECTLASTREQ:
1295                         if (apm_lastreq_rejected()) {
1296                                 error = EINVAL;
1297                         }
1298                         break;
1299                 default:
1300                         error = EINVAL;
1301                         break;
1302                 }
1303         }
1304
1305         return error;
1306 }
1307
1308 static int
1309 apmwrite(struct dev_write_args *ap)
1310 {
1311         cdev_t dev = ap->a_head.a_dev;
1312         struct uio *uio = ap->a_uio;
1313         struct apm_softc *sc = &apm_softc;
1314         u_int event_type;
1315         int error;
1316         u_char enabled;
1317
1318         if (APMDEV(dev) != APMDEV_CTL)
1319                 return(ENODEV);
1320         if (uio->uio_resid != sizeof(u_int))
1321                 return(E2BIG);
1322
1323         if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio)))
1324                 return(error);
1325
1326         if (event_type < 0 || event_type >= APM_NPMEV)
1327                 return(EINVAL);
1328
1329         if (sc->event_filter[event_type] == 0) {
1330                 enabled = 1;
1331         } else {
1332                 enabled = 0;
1333         }
1334         sc->event_filter[event_type] = enabled;
1335         APM_DPRINT("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled));
1336
1337         return uio->uio_resid;
1338 }
1339
1340 static int
1341 apmpoll(struct dev_poll_args *ap)
1342 {
1343         struct apm_softc *sc = &apm_softc;
1344         int revents = 0;
1345
1346         if (ap->a_events & (POLLIN | POLLRDNORM)) {
1347                 if (sc->event_count) {
1348                         revents |= ap->a_events & (POLLIN | POLLRDNORM);
1349                 } else {
1350                         selrecord(curthread, &sc->sc_rsel);
1351                 }
1352         }
1353         ap->a_events = revents;
1354         return (0);
1355 }
1356
1357 /*
1358  * Because apm is a static device that always exists under any attached
1359  * isa device, and not scanned by the isa device, we need an identify
1360  * function to install the device so we can probe for it.
1361  */
1362 static device_method_t apm_methods[] = {
1363         /* Device interface */
1364         DEVMETHOD(device_identify,      bus_generic_identify),
1365         DEVMETHOD(device_probe,         apm_probe),
1366         DEVMETHOD(device_attach,        apm_attach),
1367
1368         { 0, 0 }
1369 };
1370
1371 static driver_t apm_driver = {
1372         "apm",
1373         apm_methods,
1374         1,                      /* no softc (XXX) */
1375 };
1376
1377 static devclass_t apm_devclass;
1378
1379 DRIVER_MODULE(apm, nexus, apm_driver, apm_devclass, 0, 0);