kernel - Provide descriptions for lwkt.* and debug.* sysctl's
[dragonfly.git] / sys / platform / pc32 / apm / apm.c
CommitLineData
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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 */
20
21#include <sys/param.h>
22#include <sys/systm.h>
23#include <sys/eventhandler.h>
24#include <sys/conf.h>
fef8985e 25#include <sys/device.h>
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26#include <sys/kernel.h>
27#include <sys/time.h>
28#include <sys/reboot.h>
29#include <sys/bus.h>
6c1f5dbf 30#include <sys/event.h>
984263bc 31#include <sys/fcntl.h>
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32#include <sys/uio.h>
33#include <sys/signalvar.h>
34#include <sys/sysctl.h>
35#include <machine/apm_bios.h>
36#include <machine/segments.h>
37#include <machine/clock.h>
38#include <vm/vm.h>
39#include <vm/vm_param.h>
40#include <vm/pmap.h>
41#include <sys/syslog.h>
9acd5bbb 42#include <sys/thread2.h>
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43
44#include <machine/pc/bios.h>
45#include <machine/vm86.h>
46
a9295349 47#include <machine_base/apm/apm.h>
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48
49/* Used by the apm_saver screen saver module */
3ae0cd58 50int apm_display (int newstate);
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51struct apm_softc apm_softc;
52
3ae0cd58 53static void apm_resume (void);
984263bc 54static int apm_bioscall(void);
3ae0cd58 55static int apm_check_function_supported (u_int version, u_int func);
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56
57static u_long apm_version;
58
59int apm_evindex;
60
61#define SCFLAG_ONORMAL 0x0000001
62#define SCFLAG_OCTL 0x0000002
63#define SCFLAG_OPEN (SCFLAG_ONORMAL|SCFLAG_OCTL)
64
65#define APMDEV(dev) (minor(dev)&0x0f)
66#define APMDEV_NORMAL 0
67#define APMDEV_CTL 8
68
69static struct apmhook *hook[NAPM_HOOK]; /* XXX */
70
71#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
72
73/* Map version number to integer (keeps ordering of version numbers) */
74#define INTVERSION(major, minor) ((major)*100 + (minor))
75
b02bbab0 76static struct callout apm_timeout_ch;
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77
78static timeout_t apm_timeout;
79static d_open_t apmopen;
80static d_close_t apmclose;
81static d_write_t apmwrite;
82static d_ioctl_t apmioctl;
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83static d_kqfilter_t apmkqfilter;
84
85static void apmfilter_detach(struct knote *);
163625b9
SG
86static int apmfilter_read(struct knote *, long);
87static int apmfilter_write(struct knote *, long);
984263bc 88
fef8985e 89static struct dev_ops apm_ops = {
88abd8b5 90 { "apm", 0, 0 },
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91 .d_open = apmopen,
92 .d_close = apmclose,
93 .d_write = apmwrite,
94 .d_ioctl = apmioctl,
6c1f5dbf 95 .d_kqfilter = apmkqfilter
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96};
97
98static int apm_suspend_delay = 1;
99static int apm_standby_delay = 1;
100static int apm_debug = 0;
101
102#define APM_DPRINT(args...) do { \
103 if (apm_debug) { \
26be20a0 104 kprintf(args); \
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105 } \
106} while (0)
107
108SYSCTL_INT(_machdep, OID_AUTO, apm_suspend_delay, CTLFLAG_RW, &apm_suspend_delay, 1, "");
109SYSCTL_INT(_machdep, OID_AUTO, apm_standby_delay, CTLFLAG_RW, &apm_standby_delay, 1, "");
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110SYSCTL_INT(_debug, OID_AUTO, apm_debug, CTLFLAG_RW, &apm_debug, 0,
111 "Enable debug output");
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112
113/*
114 * return 0 if the function successfull,
115 * return 1 if the function unsuccessfull,
116 * return -1 if the function unsupported.
117 */
118static int
119apm_bioscall(void)
120{
121 struct apm_softc *sc = &apm_softc;
71f385dc 122 int error = 0;
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123 u_int apm_func = sc->bios.r.eax & 0xff;
124
125 if (!apm_check_function_supported(sc->intversion, apm_func)) {
126 APM_DPRINT("apm_bioscall: function 0x%x is not supported in v%d.%d\n",
127 apm_func, sc->majorversion, sc->minorversion);
128 return (-1);
129 }
130
131 sc->bios_busy = 1;
132 if (sc->connectmode == APM_PROT32CONNECT) {
133 set_bios_selectors(&sc->bios.seg,
134 BIOSCODE_FLAG | BIOSDATA_FLAG);
71f385dc 135 error = bios32(&sc->bios.r,
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136 sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL));
137 } else {
71f385dc 138 error = bios16(&sc->bios, NULL);
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139 }
140 sc->bios_busy = 0;
71f385dc 141 return (error);
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142}
143
144/* check whether APM function is supported (1) or not (0). */
145static int
146apm_check_function_supported(u_int version, u_int func)
147{
148 /* except driver version */
149 if (func == APM_DRVVERSION) {
150 return (1);
151 }
152
153 switch (version) {
154 case INTVERSION(1, 0):
155 if (func > APM_GETPMEVENT) {
156 return (0); /* not supported */
157 }
158 break;
159 case INTVERSION(1, 1):
160 if (func > APM_ENGAGEDISENGAGEPM &&
161 func < APM_OEMFUNC) {
162 return (0); /* not supported */
163 }
164 break;
165 case INTVERSION(1, 2):
166 break;
167 }
168
169 return (1); /* supported */
170}
171
172/* enable/disable power management */
173static int
174apm_enable_disable_pm(int enable)
175{
176 struct apm_softc *sc = &apm_softc;
177
178 sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
179
180 if (sc->intversion >= INTVERSION(1, 1))
181 sc->bios.r.ebx = PMDV_ALLDEV;
182 else
183 sc->bios.r.ebx = 0xffff; /* APM version 1.0 only */
184 sc->bios.r.ecx = enable;
185 sc->bios.r.edx = 0;
186 return (apm_bioscall());
187}
188
189/* register driver version (APM 1.1 or later) */
190static int
191apm_driver_version(int version)
192{
193 struct apm_softc *sc = &apm_softc;
194
195 sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION;
196 sc->bios.r.ebx = 0x0;
197 sc->bios.r.ecx = version;
198 sc->bios.r.edx = 0;
199
200 if (apm_bioscall() == 0 && sc->bios.r.eax == version)
201 return (0);
202
203 /* Some old BIOSes don't return the connection version in %ax. */
204 if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION))
205 return (0);
206
207 return (1);
208}
209
210/* engage/disengage power management (APM 1.1 or later) */
211static int
212apm_engage_disengage_pm(int engage)
213{
214 struct apm_softc *sc = &apm_softc;
215
216 sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
217 sc->bios.r.ebx = PMDV_ALLDEV;
218 sc->bios.r.ecx = engage;
219 sc->bios.r.edx = 0;
220 return (apm_bioscall());
221}
222
223/* get PM event */
224static u_int
225apm_getevent(void)
226{
227 struct apm_softc *sc = &apm_softc;
228
229 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT;
230
231 sc->bios.r.ebx = 0;
232 sc->bios.r.ecx = 0;
233 sc->bios.r.edx = 0;
234 if (apm_bioscall())
235 return (PMEV_NOEVENT);
236 return (sc->bios.r.ebx & 0xffff);
237}
238
239/* suspend entire system */
240static int
241apm_suspend_system(int state)
242{
243 struct apm_softc *sc = &apm_softc;
244
245 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
246 sc->bios.r.ebx = PMDV_ALLDEV;
247 sc->bios.r.ecx = state;
248 sc->bios.r.edx = 0;
249
250 if (apm_bioscall()) {
26be20a0 251 kprintf("Entire system suspend failure: errcode = %d\n",
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252 0xff & (sc->bios.r.eax >> 8));
253 return 1;
254 }
255 return 0;
256}
257
258/* Display control */
259/*
260 * Experimental implementation: My laptop machine can't handle this function
261 * If your laptop can control the display via APM, please inform me.
262 * HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
263 */
264int
265apm_display(int newstate)
266{
267 struct apm_softc *sc = &apm_softc;
268
269 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
270 sc->bios.r.ebx = PMDV_DISP0;
271 sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
272 sc->bios.r.edx = 0;
273 if (apm_bioscall() == 0) {
274 return 0;
275 }
276
277 /* If failed, then try to blank all display devices instead. */
278 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
279 sc->bios.r.ebx = PMDV_DISPALL; /* all display devices */
280 sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
281 sc->bios.r.edx = 0;
282 if (apm_bioscall() == 0) {
283 return 0;
284 }
26be20a0 285 kprintf("Display off failure: errcode = %d\n",
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286 0xff & (sc->bios.r.eax >> 8));
287 return 1;
288}
289
290/*
291 * Turn off the entire system.
292 */
293static void
294apm_power_off(void *junk, int howto)
295{
296 struct apm_softc *sc = &apm_softc;
297
298 /* Not halting powering off, or not active */
299 if (!(howto & RB_POWEROFF) || !apm_softc.active)
300 return;
301 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
302 sc->bios.r.ebx = PMDV_ALLDEV;
303 sc->bios.r.ecx = PMST_OFF;
304 sc->bios.r.edx = 0;
09e6e929 305 apm_bioscall();
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306}
307
308/* APM Battery low handler */
309static void
310apm_battery_low(void)
311{
26be20a0 312 kprintf("\007\007 * * * BATTERY IS LOW * * * \007\007");
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313}
314
315/* APM hook manager */
316static struct apmhook *
317apm_add_hook(struct apmhook **list, struct apmhook *ah)
318{
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319 struct apmhook *p, *prev;
320
321 APM_DPRINT("Add hook \"%s\"\n", ah->ah_name);
322
9acd5bbb 323 crit_enter();
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324 if (ah == NULL)
325 panic("illegal apm_hook!");
326 prev = NULL;
327 for (p = *list; p != NULL; prev = p, p = p->ah_next)
328 if (p->ah_order > ah->ah_order)
329 break;
330
331 if (prev == NULL) {
332 ah->ah_next = *list;
333 *list = ah;
334 } else {
335 ah->ah_next = prev->ah_next;
336 prev->ah_next = ah;
337 }
9acd5bbb 338 crit_exit();
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339 return ah;
340}
341
342static void
343apm_del_hook(struct apmhook **list, struct apmhook *ah)
344{
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345 struct apmhook *p, *prev;
346
9acd5bbb 347 crit_enter();
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348 prev = NULL;
349 for (p = *list; p != NULL; prev = p, p = p->ah_next)
350 if (p == ah)
351 goto deleteit;
352 panic("Tried to delete unregistered apm_hook.");
353 goto nosuchnode;
354deleteit:
355 if (prev != NULL)
356 prev->ah_next = p->ah_next;
357 else
358 *list = p->ah_next;
359nosuchnode:
9acd5bbb 360 crit_exit();
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361}
362
363
364/* APM driver calls some functions automatically */
365static void
366apm_execute_hook(struct apmhook *list)
367{
368 struct apmhook *p;
369
370 for (p = list; p != NULL; p = p->ah_next) {
371 APM_DPRINT("Execute APM hook \"%s.\"\n", p->ah_name);
372 if ((*(p->ah_fun))(p->ah_arg))
26be20a0 373 kprintf("Warning: APM hook \"%s\" failed", p->ah_name);
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374 }
375}
376
377
378/* establish an apm hook */
379struct apmhook *
380apm_hook_establish(int apmh, struct apmhook *ah)
381{
382 if (apmh < 0 || apmh >= NAPM_HOOK)
383 return NULL;
384
385 return apm_add_hook(&hook[apmh], ah);
386}
387
388/* disestablish an apm hook */
389void
390apm_hook_disestablish(int apmh, struct apmhook *ah)
391{
392 if (apmh < 0 || apmh >= NAPM_HOOK)
393 return;
394
395 apm_del_hook(&hook[apmh], ah);
396}
397
398
399static struct timeval suspend_time;
400static struct timeval diff_time;
401
402static int
403apm_default_resume(void *arg)
404{
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405 u_int second, minute, hour;
406 struct timeval resume_time, tmp_time;
407
408 /* modified for adjkerntz */
9acd5bbb 409 crit_enter();
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410 timer_restore(); /* restore the all timers */
411 inittodr(0); /* adjust time to RTC */
412 microtime(&resume_time);
413 getmicrotime(&tmp_time);
414 timevaladd(&tmp_time, &diff_time);
415
416#ifdef FIXME
417 /* XXX THIS DOESN'T WORK!!! */
418 time = tmp_time;
419#endif
420
421#ifdef APM_FIXUP_CALLTODO
422 /* Calculate the delta time suspended */
423 timevalsub(&resume_time, &suspend_time);
424 /* Fixup the calltodo list with the delta time. */
425 adjust_timeout_calltodo(&resume_time);
426#endif /* APM_FIXUP_CALLTODOK */
9acd5bbb 427 crit_exit();
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428#ifndef APM_FIXUP_CALLTODO
429 second = resume_time.tv_sec - suspend_time.tv_sec;
430#else /* APM_FIXUP_CALLTODO */
431 /*
432 * We've already calculated resume_time to be the delta between
433 * the suspend and the resume.
434 */
435 second = resume_time.tv_sec;
436#endif /* APM_FIXUP_CALLTODO */
437 hour = second / 3600;
438 second %= 3600;
439 minute = second / 60;
440 second %= 60;
441 log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
442 hour, minute, second);
443 return 0;
444}
445
446static int
447apm_default_suspend(void *arg)
448{
9acd5bbb 449 crit_enter();
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450 microtime(&diff_time);
451 inittodr(0);
452 microtime(&suspend_time);
453 timevalsub(&diff_time, &suspend_time);
9acd5bbb 454 crit_exit();
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455 return 0;
456}
457
3ae0cd58 458static int apm_record_event (struct apm_softc *, u_int);
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459static void apm_processevent(void);
460
461static u_int apm_op_inprog = 0;
462
463static void
464apm_do_suspend(void)
465{
466 struct apm_softc *sc = &apm_softc;
467 int error;
468
469 if (!sc)
470 return;
471
472 apm_op_inprog = 0;
473 sc->suspends = sc->suspend_countdown = 0;
474
475 if (sc->initialized) {
476 error = DEVICE_SUSPEND(root_bus);
477 if (error) {
478 DEVICE_RESUME(root_bus);
479 } else {
480 apm_execute_hook(hook[APM_HOOK_SUSPEND]);
481 if (apm_suspend_system(PMST_SUSPEND) == 0) {
482 apm_processevent();
483 } else {
484 /* Failure, 'resume' the system again */
485 apm_execute_hook(hook[APM_HOOK_RESUME]);
486 DEVICE_RESUME(root_bus);
487 }
488 }
489 }
490}
491
492static void
493apm_do_standby(void)
494{
495 struct apm_softc *sc = &apm_softc;
496
497 if (!sc)
498 return;
499
500 apm_op_inprog = 0;
501 sc->standbys = sc->standby_countdown = 0;
502
503 if (sc->initialized) {
504 /*
505 * As far as standby, we don't need to execute
506 * all of suspend hooks.
507 */
508 apm_default_suspend(&apm_softc);
509 if (apm_suspend_system(PMST_STANDBY) == 0)
510 apm_processevent();
511 }
512}
513
514static void
515apm_lastreq_notify(void)
516{
517 struct apm_softc *sc = &apm_softc;
518
519 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
520 sc->bios.r.ebx = PMDV_ALLDEV;
521 sc->bios.r.ecx = PMST_LASTREQNOTIFY;
522 sc->bios.r.edx = 0;
523 apm_bioscall();
524}
525
526static int
527apm_lastreq_rejected(void)
528{
529 struct apm_softc *sc = &apm_softc;
530
531 if (apm_op_inprog == 0) {
532 return 1; /* no operation in progress */
533 }
534
535 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
536 sc->bios.r.ebx = PMDV_ALLDEV;
537 sc->bios.r.ecx = PMST_LASTREQREJECT;
538 sc->bios.r.edx = 0;
539
540 if (apm_bioscall()) {
541 APM_DPRINT("apm_lastreq_rejected: failed\n");
542 return 1;
543 }
544 apm_op_inprog = 0;
545 return 0;
546}
547
548/*
549 * Public interface to the suspend/resume:
550 *
551 * Execute suspend and resume hook before and after sleep, respectively.
552 *
553 */
554
555void
556apm_suspend(int state)
557{
558 struct apm_softc *sc = &apm_softc;
559
560 if (!sc->initialized)
561 return;
562
563 switch (state) {
564 case PMST_SUSPEND:
565 if (sc->suspends)
566 return;
567 sc->suspends++;
568 sc->suspend_countdown = apm_suspend_delay;
569 break;
570 case PMST_STANDBY:
571 if (sc->standbys)
572 return;
573 sc->standbys++;
574 sc->standby_countdown = apm_standby_delay;
575 break;
576 default:
26be20a0 577 kprintf("apm_suspend: Unknown Suspend state 0x%x\n", state);
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578 return;
579 }
580
581 apm_op_inprog++;
582 apm_lastreq_notify();
583}
584
585void
586apm_resume(void)
587{
588 struct apm_softc *sc = &apm_softc;
589
590 if (!sc)
591 return;
592
593 if (sc->initialized) {
594 apm_execute_hook(hook[APM_HOOK_RESUME]);
595 DEVICE_RESUME(root_bus);
596 }
597}
598
599
600/* get power status per battery */
601static int
602apm_get_pwstatus(apm_pwstatus_t app)
603{
604 struct apm_softc *sc = &apm_softc;
605
606 if (app->ap_device != PMDV_ALLDEV &&
607 (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
608 return 1;
609
610 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
611 sc->bios.r.ebx = app->ap_device;
612 sc->bios.r.ecx = 0;
613 sc->bios.r.edx = 0xffff; /* default to unknown battery time */
614
615 if (apm_bioscall())
616 return 1;
617
618 app->ap_acline = (sc->bios.r.ebx >> 8) & 0xff;
619 app->ap_batt_stat = sc->bios.r.ebx & 0xff;
620 app->ap_batt_flag = (sc->bios.r.ecx >> 8) & 0xff;
621 app->ap_batt_life = sc->bios.r.ecx & 0xff;
622 sc->bios.r.edx &= 0xffff;
623 if (sc->bios.r.edx == 0xffff) /* Time is unknown */
624 app->ap_batt_time = -1;
625 else if (sc->bios.r.edx & 0x8000) /* Time is in minutes */
626 app->ap_batt_time = (sc->bios.r.edx & 0x7fff) * 60;
627 else /* Time is in seconds */
628 app->ap_batt_time = sc->bios.r.edx;
629
630 return 0;
631}
632
633
634/* get APM information */
635static int
636apm_get_info(apm_info_t aip)
637{
638 struct apm_softc *sc = &apm_softc;
639 struct apm_pwstatus aps;
640
641 bzero(&aps, sizeof(aps));
642 aps.ap_device = PMDV_ALLDEV;
643 if (apm_get_pwstatus(&aps))
644 return 1;
645
646 aip->ai_infoversion = 1;
647 aip->ai_acline = aps.ap_acline;
648 aip->ai_batt_stat = aps.ap_batt_stat;
649 aip->ai_batt_life = aps.ap_batt_life;
650 aip->ai_batt_time = aps.ap_batt_time;
651 aip->ai_major = (u_int)sc->majorversion;
652 aip->ai_minor = (u_int)sc->minorversion;
653 aip->ai_status = (u_int)sc->active;
654
655 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES;
656 sc->bios.r.ebx = 0;
657 sc->bios.r.ecx = 0;
658 sc->bios.r.edx = 0;
659 if (apm_bioscall()) {
660 aip->ai_batteries = -1; /* Unknown */
661 aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */
662 } else {
663 aip->ai_batteries = sc->bios.r.ebx & 0xff;
664 aip->ai_capabilities = sc->bios.r.ecx & 0xf;
665 }
666
667 bzero(aip->ai_spare, sizeof aip->ai_spare);
668
669 return 0;
670}
671
672
673/* inform APM BIOS that CPU is idle */
674void
675apm_cpu_idle(void)
676{
677 struct apm_softc *sc = &apm_softc;
678
679 if (sc->active) {
680
681 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE;
682 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
09e6e929 683 apm_bioscall();
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684 }
685 /*
686 * Some APM implementation halts CPU in BIOS, whenever
687 * "CPU-idle" function are invoked, but swtch() of
688 * FreeBSD halts CPU, therefore, CPU is halted twice
689 * in the sched loop. It makes the interrupt latency
690 * terribly long and be able to cause a serious problem
691 * in interrupt processing. We prevent it by removing
692 * "hlt" operation from swtch() and managed it under
693 * APM driver.
694 */
695 if (!sc->active || sc->always_halt_cpu)
696 __asm("hlt"); /* wait for interrupt */
697}
698
699/* inform APM BIOS that CPU is busy */
700void
701apm_cpu_busy(void)
702{
703 struct apm_softc *sc = &apm_softc;
704
705 /*
706 * The APM specification says this is only necessary if your BIOS
707 * slows down the processor in the idle task, otherwise it's not
708 * necessary.
709 */
710 if (sc->slow_idle_cpu && sc->active) {
711
712 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY;
713 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
714 apm_bioscall();
715 }
716}
717
718
719/*
720 * APM timeout routine:
721 *
722 * This routine is automatically called by timer once per second.
723 */
724
725static void
726apm_timeout(void *dummy)
727{
728 struct apm_softc *sc = &apm_softc;
729
730 if (apm_op_inprog)
731 apm_lastreq_notify();
732
733 if (sc->standbys && sc->standby_countdown-- <= 0)
734 apm_do_standby();
735
736 if (sc->suspends && sc->suspend_countdown-- <= 0)
737 apm_do_suspend();
738
739 if (!sc->bios_busy)
740 apm_processevent();
741
b02bbab0 742 if (sc->active == 1) {
984263bc 743 /* Run slightly more oftan than 1 Hz */
b02bbab0
JS
744 callout_reset(&apm_timeout_ch, hz - 1, apm_timeout, NULL);
745 }
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MD
746}
747
748/* enable APM BIOS */
749static void
750apm_event_enable(void)
751{
752 struct apm_softc *sc = &apm_softc;
753
754 APM_DPRINT("called apm_event_enable()\n");
755 if (sc->initialized) {
756 sc->active = 1;
b02bbab0 757 callout_init(&apm_timeout_ch);
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758 apm_timeout(sc);
759 }
760}
761
762/* disable APM BIOS */
763static void
764apm_event_disable(void)
765{
766 struct apm_softc *sc = &apm_softc;
767
768 APM_DPRINT("called apm_event_disable()\n");
769 if (sc->initialized) {
b02bbab0 770 callout_stop(&apm_timeout_ch);
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771 sc->active = 0;
772 }
773}
774
775/* halt CPU in scheduling loop */
776static void
777apm_halt_cpu(void)
778{
779 struct apm_softc *sc = &apm_softc;
780
781 if (sc->initialized)
782 sc->always_halt_cpu = 1;
783}
784
785/* don't halt CPU in scheduling loop */
786static void
787apm_not_halt_cpu(void)
788{
789 struct apm_softc *sc = &apm_softc;
790
791 if (sc->initialized)
792 sc->always_halt_cpu = 0;
793}
794
795/* device driver definitions */
796
797/*
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798 * probe for APM BIOS
799 */
800static int
801apm_probe(device_t dev)
802{
803#define APM_KERNBASE KERNBASE
804 struct vm86frame vmf;
805 struct apm_softc *sc = &apm_softc;
806 int disabled, flags;
807
808 if (resource_int_value("apm", 0, "disabled", &disabled) == 0
809 && disabled != 0)
810 return ENXIO;
811
812 device_set_desc(dev, "APM BIOS");
813
814 if ( device_get_unit(dev) > 0 ) {
26be20a0 815 kprintf("apm: Only one APM driver supported.\n");
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816 return ENXIO;
817 }
818
819 if (resource_int_value("apm", 0, "flags", &flags) != 0)
820 flags = 0;
821
822 bzero(&vmf, sizeof(struct vm86frame)); /* safety */
823 bzero(&apm_softc, sizeof(apm_softc));
824 vmf.vmf_ah = APM_BIOS;
825 vmf.vmf_al = APM_INSTCHECK;
826 vmf.vmf_bx = 0;
827 if (vm86_intcall(APM_INT, &vmf))
828 return ENXIO; /* APM not found */
829 if (vmf.vmf_bx != 0x504d) {
26be20a0 830 kprintf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx);
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831 return ENXIO;
832 }
833 if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) {
26be20a0 834 kprintf("apm: protected mode connections are not supported\n");
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MD
835 return ENXIO;
836 }
837
838 apm_version = vmf.vmf_ax;
839 sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0);
840 sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0);
841 sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0);
842
843 vmf.vmf_ah = APM_BIOS;
844 vmf.vmf_al = APM_DISCONNECT;
845 vmf.vmf_bx = 0;
846 vm86_intcall(APM_INT, &vmf); /* disconnect, just in case */
847
848 if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) {
849 vmf.vmf_ah = APM_BIOS;
850 vmf.vmf_al = APM_PROT32CONNECT;
851 vmf.vmf_bx = 0;
852 if (vm86_intcall(APM_INT, &vmf)) {
26be20a0 853 kprintf("apm: 32-bit connection error.\n");
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854 return (ENXIO);
855 }
856 sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
857 sc->bios.seg.code32.limit = 0xffff;
858 sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
859 sc->bios.seg.code16.limit = 0xffff;
860 sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
861 sc->bios.seg.data.limit = 0xffff;
862 sc->bios.entry = vmf.vmf_ebx;
863 sc->connectmode = APM_PROT32CONNECT;
864 } else {
865 /* use 16-bit connection */
866 vmf.vmf_ah = APM_BIOS;
867 vmf.vmf_al = APM_PROT16CONNECT;
868 vmf.vmf_bx = 0;
869 if (vm86_intcall(APM_INT, &vmf)) {
26be20a0 870 kprintf("apm: 16-bit connection error.\n");
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871 return (ENXIO);
872 }
873 sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
874 sc->bios.seg.code16.limit = 0xffff;
875 sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
876 sc->bios.seg.data.limit = 0xffff;
877 sc->bios.entry = vmf.vmf_bx;
878 sc->connectmode = APM_PROT16CONNECT;
879 }
880 return(0);
881}
882
883
884/*
885 * return 0 if the user will notice and handle the event,
886 * return 1 if the kernel driver should do so.
887 */
888static int
889apm_record_event(struct apm_softc *sc, u_int event_type)
890{
891 struct apm_event_info *evp;
892
893 if ((sc->sc_flags & SCFLAG_OPEN) == 0)
894 return 1; /* no user waiting */
895 if (sc->event_count == APM_NEVENTS)
896 return 1; /* overflow */
897 if (sc->event_filter[event_type] == 0)
898 return 1; /* not registered */
899 evp = &sc->event_list[sc->event_ptr];
900 sc->event_count++;
901 sc->event_ptr++;
902 sc->event_ptr %= APM_NEVENTS;
903 evp->type = event_type;
904 evp->index = ++apm_evindex;
5b22f1a7 905 KNOTE(&sc->sc_rkq.ki_note, 0);
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906 return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */
907}
908
909/* Process APM event */
910static void
911apm_processevent(void)
912{
913 int apm_event;
914 struct apm_softc *sc = &apm_softc;
915
916#define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
917 APM_DPRINT("Received APM Event: " #symbol "\n");
918
919 do {
920 apm_event = apm_getevent();
921 switch (apm_event) {
922 OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
923 if (apm_op_inprog == 0) {
924 apm_op_inprog++;
925 if (apm_record_event(sc, apm_event)) {
926 apm_suspend(PMST_STANDBY);
927 }
928 }
929 break;
930 OPMEV_DEBUGMESSAGE(PMEV_USERSTANDBYREQ);
931 if (apm_op_inprog == 0) {
932 apm_op_inprog++;
933 if (apm_record_event(sc, apm_event)) {
934 apm_suspend(PMST_STANDBY);
935 }
936 }
937 break;
938 OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
939 apm_lastreq_notify();
940 if (apm_op_inprog == 0) {
941 apm_op_inprog++;
942 if (apm_record_event(sc, apm_event)) {
943 apm_do_suspend();
944 }
945 }
946 return; /* XXX skip the rest */
947 OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
948 apm_lastreq_notify();
949 if (apm_op_inprog == 0) {
950 apm_op_inprog++;
951 if (apm_record_event(sc, apm_event)) {
952 apm_do_suspend();
953 }
954 }
955 return; /* XXX skip the rest */
956 OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
957 apm_do_suspend();
958 break;
959 OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
960 apm_record_event(sc, apm_event);
961 apm_resume();
962 break;
963 OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
964 apm_record_event(sc, apm_event);
965 apm_resume();
966 break;
967 OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
968 apm_record_event(sc, apm_event);
969 apm_resume();
970 break;
971 OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
972 if (apm_record_event(sc, apm_event)) {
973 apm_battery_low();
974 apm_suspend(PMST_SUSPEND);
975 }
976 break;
977 OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
978 apm_record_event(sc, apm_event);
979 break;
980 OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
981 apm_record_event(sc, apm_event);
982 inittodr(0); /* adjust time to RTC */
983 break;
984 OPMEV_DEBUGMESSAGE(PMEV_CAPABILITIESCHANGE);
985 apm_record_event(sc, apm_event);
986 break;
987 case PMEV_NOEVENT:
988 break;
989 default:
26be20a0 990 kprintf("Unknown Original APM Event 0x%x\n", apm_event);
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MD
991 break;
992 }
993 } while (apm_event != PMEV_NOEVENT);
994}
995
996/*
997 * Attach APM:
998 *
999 * Initialize APM driver
1000 */
1001
1002static int
1003apm_attach(device_t dev)
1004{
1005 struct apm_softc *sc = &apm_softc;
1006 int flags;
1007 int drv_version;
1008
1009 if (resource_int_value("apm", 0, "flags", &flags) != 0)
1010 flags = 0;
1011
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1012 sc->initialized = 0;
1013
1014 /* Must be externally enabled */
1015 sc->active = 0;
1016
1017 /* Always call HLT in idle loop */
1018 sc->always_halt_cpu = 1;
1019
bc01a404 1020 kgetenv_int("debug.apm_debug", &apm_debug);
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MD
1021
1022 /* print bootstrap messages */
1023 APM_DPRINT("apm: APM BIOS version %04lx\n", apm_version);
1024 APM_DPRINT("apm: Code16 0x%08x, Data 0x%08x\n",
1025 sc->bios.seg.code16.base, sc->bios.seg.data.base);
1026 APM_DPRINT("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
1027 sc->bios.entry, is_enabled(sc->slow_idle_cpu),
1028 is_enabled(!sc->disabled));
1029 APM_DPRINT("apm: CS_limit=0x%x, DS_limit=0x%x\n",
1030 sc->bios.seg.code16.limit, sc->bios.seg.data.limit);
1031
1032 /*
1033 * In one test, apm bios version was 1.02; an attempt to register
1034 * a 1.04 driver resulted in a 1.00 connection! Registering a
1035 * 1.02 driver resulted in a 1.02 connection.
1036 */
1037 drv_version = apm_version > 0x102 ? 0x102 : apm_version;
1038 for (; drv_version > 0x100; drv_version--)
1039 if (apm_driver_version(drv_version) == 0)
1040 break;
1041 sc->minorversion = ((drv_version & 0x00f0) >> 4) * 10 +
1042 ((drv_version & 0x000f) >> 0);
1043 sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 +
1044 ((apm_version & 0x0f00) >> 8);
1045
1046 sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
1047
1048 if (sc->intversion >= INTVERSION(1, 1))
1049 APM_DPRINT("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
1050 device_printf(dev, "found APM BIOS v%ld.%ld, connected at v%d.%d\n",
1051 ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8),
1052 ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0),
1053 sc->majorversion, sc->minorversion);
1054
1055
1056 APM_DPRINT("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
1057 /* enable power management */
1058 if (sc->disabled) {
1059 if (apm_enable_disable_pm(1)) {
1060 APM_DPRINT("apm: *Warning* enable function failed! [%x]\n",
1061 (sc->bios.r.eax >> 8) & 0xff);
1062 }
1063 }
1064
1065 /* engage power managment (APM 1.1 or later) */
1066 if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
1067 if (apm_engage_disengage_pm(1)) {
1068 APM_DPRINT("apm: *Warning* engage function failed err=[%x]",
1069 (sc->bios.r.eax >> 8) & 0xff);
1070 APM_DPRINT(" (Docked or using external power?).\n");
1071 }
1072 }
1073
1074 /* default suspend hook */
1075 sc->sc_suspend.ah_fun = apm_default_suspend;
1076 sc->sc_suspend.ah_arg = sc;
1077 sc->sc_suspend.ah_name = "default suspend";
1078 sc->sc_suspend.ah_order = APM_MAX_ORDER;
1079
1080 /* default resume hook */
1081 sc->sc_resume.ah_fun = apm_default_resume;
1082 sc->sc_resume.ah_arg = sc;
1083 sc->sc_resume.ah_name = "default resume";
1084 sc->sc_resume.ah_order = APM_MIN_ORDER;
1085
1086 apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
1087 apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
1088
1089 /* Power the system off using APM */
1090 EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL,
1091 SHUTDOWN_PRI_LAST);
1092
1093 sc->initialized = 1;
1094
fef8985e
MD
1095 make_dev(&apm_ops, 0, UID_ROOT, GID_OPERATOR, 0660, "apm");
1096 make_dev(&apm_ops, 8, UID_ROOT, GID_OPERATOR, 0660, "apmctl");
984263bc
MD
1097 return 0;
1098}
1099
1100static int
fef8985e 1101apmopen(struct dev_open_args *ap)
984263bc 1102{
b13267a5 1103 cdev_t dev = ap->a_head.a_dev;
984263bc
MD
1104 struct apm_softc *sc = &apm_softc;
1105 int ctl = APMDEV(dev);
1106
1107 if (!sc->initialized)
1108 return (ENXIO);
1109
1110 switch (ctl) {
1111 case APMDEV_CTL:
fef8985e 1112 if (!(ap->a_oflags & FWRITE))
984263bc
MD
1113 return EINVAL;
1114 if (sc->sc_flags & SCFLAG_OCTL)
1115 return EBUSY;
1116 sc->sc_flags |= SCFLAG_OCTL;
1117 bzero(sc->event_filter, sizeof sc->event_filter);
1118 break;
1119 case APMDEV_NORMAL:
1120 sc->sc_flags |= SCFLAG_ONORMAL;
1121 break;
1122 default:
1123 return ENXIO;
1124 break;
1125 }
1126 return 0;
1127}
1128
1129static int
fef8985e 1130apmclose(struct dev_close_args *ap)
984263bc 1131{
b13267a5 1132 cdev_t dev = ap->a_head.a_dev;
984263bc
MD
1133 struct apm_softc *sc = &apm_softc;
1134 int ctl = APMDEV(dev);
1135
1136 switch (ctl) {
1137 case APMDEV_CTL:
1138 apm_lastreq_rejected();
1139 sc->sc_flags &= ~SCFLAG_OCTL;
1140 bzero(sc->event_filter, sizeof sc->event_filter);
1141 break;
1142 case APMDEV_NORMAL:
1143 sc->sc_flags &= ~SCFLAG_ONORMAL;
1144 break;
1145 }
1146 if ((sc->sc_flags & SCFLAG_OPEN) == 0) {
1147 sc->event_count = 0;
1148 sc->event_ptr = 0;
1149 }
1150 return 0;
1151}
1152
1153static int
fef8985e 1154apmioctl(struct dev_ioctl_args *ap)
984263bc 1155{
b13267a5 1156 cdev_t dev = ap->a_head.a_dev;
984263bc
MD
1157 struct apm_softc *sc = &apm_softc;
1158 struct apm_bios_arg *args;
1159 int error = 0;
1160 int ret;
1161 int newstate;
1162
1163 if (!sc->initialized)
1164 return (ENXIO);
fef8985e
MD
1165 APM_DPRINT("APM ioctl: cmd = 0x%lx\n", ap->a_cmd);
1166
1167 switch (ap->a_cmd) {
984263bc 1168 case APMIO_SUSPEND:
fef8985e 1169 if (!(ap->a_fflag & FWRITE))
984263bc
MD
1170 return (EPERM);
1171 if (sc->active)
1172 apm_suspend(PMST_SUSPEND);
1173 else
1174 error = EINVAL;
1175 break;
1176
1177 case APMIO_STANDBY:
fef8985e 1178 if (!(ap->a_fflag & FWRITE))
984263bc
MD
1179 return (EPERM);
1180 if (sc->active)
1181 apm_suspend(PMST_STANDBY);
1182 else
1183 error = EINVAL;
1184 break;
1185
1186 case APMIO_GETINFO_OLD:
1187 {
1188 struct apm_info info;
1189 apm_info_old_t aiop;
1190
1191 if (apm_get_info(&info))
1192 error = ENXIO;
fef8985e 1193 aiop = (apm_info_old_t)ap->a_data;
984263bc
MD
1194 aiop->ai_major = info.ai_major;
1195 aiop->ai_minor = info.ai_minor;
1196 aiop->ai_acline = info.ai_acline;
1197 aiop->ai_batt_stat = info.ai_batt_stat;
1198 aiop->ai_batt_life = info.ai_batt_life;
1199 aiop->ai_status = info.ai_status;
1200 }
1201 break;
1202 case APMIO_GETINFO:
fef8985e 1203 if (apm_get_info((apm_info_t)ap->a_data))
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MD
1204 error = ENXIO;
1205 break;
1206 case APMIO_GETPWSTATUS:
fef8985e 1207 if (apm_get_pwstatus((apm_pwstatus_t)ap->a_data))
984263bc
MD
1208 error = ENXIO;
1209 break;
1210 case APMIO_ENABLE:
fef8985e 1211 if (!(ap->a_fflag & FWRITE))
984263bc
MD
1212 return (EPERM);
1213 apm_event_enable();
1214 break;
1215 case APMIO_DISABLE:
fef8985e 1216 if (!(ap->a_fflag & FWRITE))
984263bc
MD
1217 return (EPERM);
1218 apm_event_disable();
1219 break;
1220 case APMIO_HALTCPU:
fef8985e 1221 if (!(ap->a_fflag & FWRITE))
984263bc
MD
1222 return (EPERM);
1223 apm_halt_cpu();
1224 break;
1225 case APMIO_NOTHALTCPU:
fef8985e 1226 if (!(ap->a_fflag & FWRITE))
984263bc
MD
1227 return (EPERM);
1228 apm_not_halt_cpu();
1229 break;
1230 case APMIO_DISPLAY:
fef8985e 1231 if (!(ap->a_fflag & FWRITE))
984263bc 1232 return (EPERM);
fef8985e 1233 newstate = *(int *)ap->a_data;
984263bc
MD
1234 if (apm_display(newstate))
1235 error = ENXIO;
1236 break;
1237 case APMIO_BIOS:
fef8985e 1238 if (!(ap->a_fflag & FWRITE))
984263bc
MD
1239 return (EPERM);
1240 /* XXX compatibility with the old interface */
fef8985e 1241 args = (struct apm_bios_arg *)ap->a_data;
984263bc
MD
1242 sc->bios.r.eax = args->eax;
1243 sc->bios.r.ebx = args->ebx;
1244 sc->bios.r.ecx = args->ecx;
1245 sc->bios.r.edx = args->edx;
1246 sc->bios.r.esi = args->esi;
1247 sc->bios.r.edi = args->edi;
1248 if ((ret = apm_bioscall())) {
1249 /*
1250 * Return code 1 means bios call was unsuccessful.
1251 * Error code is stored in %ah.
1252 * Return code -1 means bios call was unsupported
1253 * in the APM BIOS version.
1254 */
1255 if (ret == -1) {
1256 error = EINVAL;
1257 }
1258 } else {
1259 /*
1260 * Return code 0 means bios call was successful.
1261 * We need only %al and can discard %ah.
1262 */
1263 sc->bios.r.eax &= 0xff;
1264 }
1265 args->eax = sc->bios.r.eax;
1266 args->ebx = sc->bios.r.ebx;
1267 args->ecx = sc->bios.r.ecx;
1268 args->edx = sc->bios.r.edx;
1269 args->esi = sc->bios.r.esi;
1270 args->edi = sc->bios.r.edi;
1271 break;
1272 default:
1273 error = EINVAL;
1274 break;
1275 }
1276
1277 /* for /dev/apmctl */
1278 if (APMDEV(dev) == APMDEV_CTL) {
1279 struct apm_event_info *evp;
1280 int i;
1281
1282 error = 0;
fef8985e 1283 switch (ap->a_cmd) {
984263bc
MD
1284 case APMIO_NEXTEVENT:
1285 if (!sc->event_count) {
1286 error = EAGAIN;
1287 } else {
fef8985e 1288 evp = (struct apm_event_info *)ap->a_data;
984263bc
MD
1289 i = sc->event_ptr + APM_NEVENTS - sc->event_count;
1290 i %= APM_NEVENTS;
1291 *evp = sc->event_list[i];
1292 sc->event_count--;
1293 }
1294 break;
1295 case APMIO_REJECTLASTREQ:
1296 if (apm_lastreq_rejected()) {
1297 error = EINVAL;
1298 }
1299 break;
1300 default:
1301 error = EINVAL;
1302 break;
1303 }
1304 }
1305
1306 return error;
1307}
1308
1309static int
fef8985e 1310apmwrite(struct dev_write_args *ap)
984263bc 1311{
b13267a5 1312 cdev_t dev = ap->a_head.a_dev;
fef8985e 1313 struct uio *uio = ap->a_uio;
984263bc
MD
1314 struct apm_softc *sc = &apm_softc;
1315 u_int event_type;
1316 int error;
1317 u_char enabled;
1318
1319 if (APMDEV(dev) != APMDEV_CTL)
1320 return(ENODEV);
1321 if (uio->uio_resid != sizeof(u_int))
1322 return(E2BIG);
1323
1324 if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio)))
1325 return(error);
1326
1327 if (event_type < 0 || event_type >= APM_NPMEV)
1328 return(EINVAL);
1329
1330 if (sc->event_filter[event_type] == 0) {
1331 enabled = 1;
1332 } else {
1333 enabled = 0;
1334 }
1335 sc->event_filter[event_type] = enabled;
1336 APM_DPRINT("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled));
1337
1338 return uio->uio_resid;
1339}
1340
163625b9 1341static struct filterops apmfiltops_read =
4c91dbc9 1342 { FILTEROP_ISFD, NULL, apmfilter_detach, apmfilter_read };
163625b9 1343static struct filterops apmfiltops_write =
4c91dbc9 1344 { FILTEROP_ISFD, NULL, apmfilter_detach, apmfilter_write };
6c1f5dbf
SG
1345
1346static int
1347apmkqfilter(struct dev_kqfilter_args *ap)
1348{
1349 struct apm_softc *sc = &apm_softc;
1350 struct knote *kn = ap->a_kn;
1351 struct klist *klist;
1352
1353 ap->a_result = 0;
1354
1355 switch (kn->kn_filter) {
1356 case EVFILT_READ:
163625b9
SG
1357 kn->kn_fop = &apmfiltops_read;
1358 kn->kn_hook = (caddr_t)sc;
1359 break;
1360 case EVFILT_WRITE:
1361 kn->kn_fop = &apmfiltops_write;
6c1f5dbf
SG
1362 kn->kn_hook = (caddr_t)sc;
1363 break;
1364 default:
b287d649 1365 ap->a_result = EOPNOTSUPP;
6c1f5dbf
SG
1366 return (0);
1367 }
1368
5b22f1a7
SG
1369 klist = &sc->sc_rkq.ki_note;
1370 knote_insert(klist, kn);
6c1f5dbf
SG
1371
1372 return (0);
1373}
1374
1375static void
1376apmfilter_detach(struct knote *kn)
1377{
1378 struct apm_softc *sc = (struct apm_softc *)kn->kn_hook;
1379 struct klist *klist;
1380
5b22f1a7
SG
1381 klist = &sc->sc_rkq.ki_note;
1382 knote_remove(klist, kn);
6c1f5dbf
SG
1383}
1384
1385static int
163625b9 1386apmfilter_read(struct knote *kn, long hint)
6c1f5dbf
SG
1387{
1388 struct apm_softc *sc = (struct apm_softc *)kn->kn_hook;
1389 int ready = 0;
1390
1391 if (sc->event_count)
1392 ready = 1;
1393
1394 return (ready);
1395}
1396
163625b9
SG
1397static int
1398apmfilter_write(struct knote *kn, long hint)
1399{
1400 /* write()'s are always OK */
1401 return (1);
1402}
1403
39b5d600
MD
1404/*
1405 * Because apm is a static device that always exists under any attached
1406 * isa device, and not scanned by the isa device, we need an identify
1407 * function to install the device so we can probe for it.
1408 */
984263bc
MD
1409static device_method_t apm_methods[] = {
1410 /* Device interface */
39b5d600 1411 DEVMETHOD(device_identify, bus_generic_identify),
984263bc
MD
1412 DEVMETHOD(device_probe, apm_probe),
1413 DEVMETHOD(device_attach, apm_attach),
1414
1415 { 0, 0 }
1416};
1417
1418static driver_t apm_driver = {
1419 "apm",
1420 apm_methods,
1421 1, /* no softc (XXX) */
1422};
1423
1424static devclass_t apm_devclass;
1425
1426DRIVER_MODULE(apm, nexus, apm_driver, apm_devclass, 0, 0);
39b5d600 1427