sys/i386/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/i386/apm/Attic/apm.c,v 1.11 2005/06/03 17:12:17 dillon 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/kernel.h>
  27 #include <sys/time.h>
  28 #include <sys/reboot.h>
  29 #include <sys/bus.h>
  30 #include <sys/select.h>
  31 #include <sys/poll.h>
  32 #include <sys/fcntl.h>
  33 #include <sys/uio.h>
  34 #include <sys/signalvar.h>
  35 #include <sys/sysctl.h>
  36 #include <machine/apm_bios.h>
  37 #include <machine/segments.h>
  38 #include <machine/clock.h>
  39 #include <vm/vm.h>
  40 #include <vm/vm_param.h>
  41 #include <vm/pmap.h>
  42 #include <sys/syslog.h>
  43 #include <sys/thread2.h>
  44
  45 #include <machine/pc/bios.h>
  46 #include <machine/vm86.h>
  47
  48 #include <i386/apm/apm.h>
  49
  50 /* Used by the apm_saver screen saver module */
  51 int apm_display (int newstate);
  52 struct apm_softc apm_softc;
  53
  54 static void apm_resume (void);
  55 static int apm_bioscall(void);
  56 static int apm_check_function_supported (u_int version, u_int func);
  57
  58 static u_long   apm_version;
  59
  60 int     apm_evindex;
  61
  62 #define SCFLAG_ONORMAL  0x0000001
  63 #define SCFLAG_OCTL     0x0000002
  64 #define SCFLAG_OPEN     (SCFLAG_ONORMAL|SCFLAG_OCTL)
  65
  66 #define APMDEV(dev)     (minor(dev)&0x0f)
  67 #define APMDEV_NORMAL   0
  68 #define APMDEV_CTL      8
  69
  70 static struct apmhook   *hook[NAPM_HOOK];               /* XXX */
  71
  72 #define is_enabled(foo) ((foo) ? "enabled" : "disabled")
  73
  74 /* Map version number to integer (keeps ordering of version numbers) */
  75 #define INTVERSION(major, minor)        ((major)*100 + (minor))
  76
  77 static struct callout apm_timeout_ch;
  78
  79 static timeout_t apm_timeout;
  80 static d_open_t apmopen;
  81 static d_close_t apmclose;
  82 static d_write_t apmwrite;
  83 static d_ioctl_t apmioctl;
  84 static d_poll_t apmpoll;
  85
  86 #define CDEV_MAJOR 39
  87 static struct cdevsw apm_cdevsw = {
  88         /* name */      "apm",
  89         /* maj */       CDEV_MAJOR,
  90         /* flags */     0,
  91         /* port */      NULL,
  92         /* clone */     NULL,
  93
  94         /* open */      apmopen,
  95         /* close */     apmclose,
  96         /* read */      noread,
  97         /* write */     apmwrite,
  98         /* ioctl */     apmioctl,
  99         /* poll */      apmpoll,
 100         /* mmap */      nommap,
 101         /* strategy */  nostrategy,
 102         /* dump */      nodump,
 103         /* psize */     nopsize
 104 };
 105
 106 static int apm_suspend_delay = 1;
 107 static int apm_standby_delay = 1;
 108 static int apm_debug = 0;
 109
 110 #define APM_DPRINT(args...) do  {                                       \
 111         if (apm_debug) {                                                \
 112                 printf(args);                                           \
 113         }                                                               \
 114 } while (0)
 115
 116 SYSCTL_INT(_machdep, OID_AUTO, apm_suspend_delay, CTLFLAG_RW, &apm_suspend_delay, 1, "");
 117 SYSCTL_INT(_machdep, OID_AUTO, apm_standby_delay, CTLFLAG_RW, &apm_standby_delay, 1, "");
 118 SYSCTL_INT(_debug, OID_AUTO, apm_debug, CTLFLAG_RW, &apm_debug, 0, "");
 119
 120 /*
 121  * return  0 if the function successfull,
 122  * return  1 if the function unsuccessfull,
 123  * return -1 if the function unsupported.
 124  */
 125 static int
 126 apm_bioscall(void)
 127 {
 128         struct apm_softc *sc = &apm_softc;
 129         int errno = 0;
 130         u_int apm_func = sc->bios.r.eax & 0xff;
 131
 132         if (!apm_check_function_supported(sc->intversion, apm_func)) {
 133                 APM_DPRINT("apm_bioscall: function 0x%x is not supported in v%d.%d\n",
 134                     apm_func, sc->majorversion, sc->minorversion);
 135                 return (-1);
 136         }
 137
 138         sc->bios_busy = 1;
 139         if (sc->connectmode == APM_PROT32CONNECT) {
 140                 set_bios_selectors(&sc->bios.seg,
 141                                    BIOSCODE_FLAG | BIOSDATA_FLAG);
 142                 errno = bios32(&sc->bios.r,
 143                                sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL));
 144         } else {
 145                 errno = bios16(&sc->bios, NULL);
 146         }
 147         sc->bios_busy = 0;
 148         return (errno);
 149 }
 150
 151 /* check whether APM function is supported (1)  or not (0). */
 152 static int
 153 apm_check_function_supported(u_int version, u_int func)
 154 {
 155         /* except driver version */
 156         if (func == APM_DRVVERSION) {
 157                 return (1);
 158         }
 159
 160         switch (version) {
 161         case INTVERSION(1, 0):
 162                 if (func > APM_GETPMEVENT) {
 163                         return (0); /* not supported */
 164                 }
 165                 break;
 166         case INTVERSION(1, 1):
 167                 if (func > APM_ENGAGEDISENGAGEPM &&
 168                     func < APM_OEMFUNC) {
 169                         return (0); /* not supported */
 170                 }
 171                 break;
 172         case INTVERSION(1, 2):
 173                 break;
 174         }
 175
 176         return (1); /* supported */
 177 }
 178
 179 /* enable/disable power management */
 180 static int
 181 apm_enable_disable_pm(int enable)
 182 {
 183         struct apm_softc *sc = &apm_softc;
 184
 185         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
 186
 187         if (sc->intversion >= INTVERSION(1, 1))
 188                 sc->bios.r.ebx  = PMDV_ALLDEV;
 189         else
 190                 sc->bios.r.ebx  = 0xffff;       /* APM version 1.0 only */
 191         sc->bios.r.ecx  = enable;
 192         sc->bios.r.edx = 0;
 193         return (apm_bioscall());
 194 }
 195
 196 /* register driver version (APM 1.1 or later) */
 197 static int
 198 apm_driver_version(int version)
 199 {
 200         struct apm_softc *sc = &apm_softc;
 201
 202         sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION;
 203         sc->bios.r.ebx  = 0x0;
 204         sc->bios.r.ecx  = version;
 205         sc->bios.r.edx = 0;
 206
 207         if (apm_bioscall() == 0 && sc->bios.r.eax == version)
 208                 return (0);
 209
 210         /* Some old BIOSes don't return the connection version in %ax. */
 211         if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION))
 212                 return (0);
 213
 214         return (1);
 215 }
 216
 217 /* engage/disengage power management (APM 1.1 or later) */
 218 static int
 219 apm_engage_disengage_pm(int engage)
 220 {
 221         struct apm_softc *sc = &apm_softc;
 222
 223         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
 224         sc->bios.r.ebx = PMDV_ALLDEV;
 225         sc->bios.r.ecx = engage;
 226         sc->bios.r.edx = 0;
 227         return (apm_bioscall());
 228 }
 229
 230 /* get PM event */
 231 static u_int
 232 apm_getevent(void)
 233 {
 234         struct apm_softc *sc = &apm_softc;
 235
 236         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT;
 237
 238         sc->bios.r.ebx = 0;
 239         sc->bios.r.ecx = 0;
 240         sc->bios.r.edx = 0;
 241         if (apm_bioscall())
 242                 return (PMEV_NOEVENT);
 243         return (sc->bios.r.ebx & 0xffff);
 244 }
 245
 246 /* suspend entire system */
 247 static int
 248 apm_suspend_system(int state)
 249 {
 250         struct apm_softc *sc = &apm_softc;
 251
 252         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 253         sc->bios.r.ebx = PMDV_ALLDEV;
 254         sc->bios.r.ecx = state;
 255         sc->bios.r.edx = 0;
 256
 257         if (apm_bioscall()) {
 258                 printf("Entire system suspend failure: errcode = %d\n",
 259                        0xff & (sc->bios.r.eax >> 8));
 260                 return 1;
 261         }
 262         return 0;
 263 }
 264
 265 /* Display control */
 266 /*
 267  * Experimental implementation: My laptop machine can't handle this function
 268  * If your laptop can control the display via APM, please inform me.
 269  *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
 270  */
 271 int
 272 apm_display(int newstate)
 273 {
 274         struct apm_softc *sc = &apm_softc;
 275
 276         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 277         sc->bios.r.ebx = PMDV_DISP0;
 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
 284         /* If failed, then try to blank all display devices instead. */
 285         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 286         sc->bios.r.ebx = PMDV_DISPALL;  /* all display devices */
 287         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
 288         sc->bios.r.edx = 0;
 289         if (apm_bioscall() == 0) {
 290                 return 0;
 291         }
 292         printf("Display off failure: errcode = %d\n",
 293                0xff & (sc->bios.r.eax >> 8));
 294         return 1;
 295 }
 296
 297 /*
 298  * Turn off the entire system.
 299  */
 300 static void
 301 apm_power_off(void *junk, int howto)
 302 {
 303         struct apm_softc *sc = &apm_softc;
 304
 305         /* Not halting powering off, or not active */
 306         if (!(howto & RB_POWEROFF) || !apm_softc.active)
 307                 return;
 308         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 309         sc->bios.r.ebx = PMDV_ALLDEV;
 310         sc->bios.r.ecx = PMST_OFF;
 311         sc->bios.r.edx = 0;
 312         (void) apm_bioscall();
 313 }
 314
 315 /* APM Battery low handler */
 316 static void
 317 apm_battery_low(void)
 318 {
 319         printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
 320 }
 321
 322 /* APM hook manager */
 323 static struct apmhook *
 324 apm_add_hook(struct apmhook **list, struct apmhook *ah)
 325 {
 326         struct apmhook *p, *prev;
 327
 328         APM_DPRINT("Add hook \"%s\"\n", ah->ah_name);
 329
 330         crit_enter();
 331         if (ah == NULL)
 332                 panic("illegal apm_hook!");
 333         prev = NULL;
 334         for (p = *list; p != NULL; prev = p, p = p->ah_next)
 335                 if (p->ah_order > ah->ah_order)
 336                         break;
 337
 338         if (prev == NULL) {
 339                 ah->ah_next = *list;
 340                 *list = ah;
 341         } else {
 342                 ah->ah_next = prev->ah_next;
 343                 prev->ah_next = ah;
 344         }
 345         crit_exit();
 346         return ah;
 347 }
 348
 349 static void
 350 apm_del_hook(struct apmhook **list, struct apmhook *ah)
 351 {
 352         struct apmhook *p, *prev;
 353
 354         crit_enter();
 355         prev = NULL;
 356         for (p = *list; p != NULL; prev = p, p = p->ah_next)
 357                 if (p == ah)
 358                         goto deleteit;
 359         panic("Tried to delete unregistered apm_hook.");
 360         goto nosuchnode;
 361 deleteit:
 362         if (prev != NULL)
 363                 prev->ah_next = p->ah_next;
 364         else
 365                 *list = p->ah_next;
 366 nosuchnode:
 367         crit_exit();
 368 }
 369
 370
 371 /* APM driver calls some functions automatically */
 372 static void
 373 apm_execute_hook(struct apmhook *list)
 374 {
 375         struct apmhook *p;
 376
 377         for (p = list; p != NULL; p = p->ah_next) {
 378                 APM_DPRINT("Execute APM hook \"%s.\"\n", p->ah_name);
 379                 if ((*(p->ah_fun))(p->ah_arg))
 380                         printf("Warning: APM hook \"%s\" failed", p->ah_name);
 381         }
 382 }
 383
 384
 385 /* establish an apm hook */
 386 struct apmhook *
 387 apm_hook_establish(int apmh, struct apmhook *ah)
 388 {
 389         if (apmh < 0 || apmh >= NAPM_HOOK)
 390                 return NULL;
 391
 392         return apm_add_hook(&hook[apmh], ah);
 393 }
 394
 395 /* disestablish an apm hook */
 396 void
 397 apm_hook_disestablish(int apmh, struct apmhook *ah)
 398 {
 399         if (apmh < 0 || apmh >= NAPM_HOOK)
 400                 return;
 401
 402         apm_del_hook(&hook[apmh], ah);
 403 }
 404
 405
 406 static struct timeval suspend_time;
 407 static struct timeval diff_time;
 408
 409 static int
 410 apm_default_resume(void *arg)
 411 {
 412         u_int second, minute, hour;
 413         struct timeval resume_time, tmp_time;
 414
 415         /* modified for adjkerntz */
 416         crit_enter();
 417         timer_restore();                /* restore the all timers */
 418         inittodr(0);                    /* adjust time to RTC */
 419         microtime(&resume_time);
 420         getmicrotime(&tmp_time);
 421         timevaladd(&tmp_time, &diff_time);
 422
 423 #ifdef FIXME
 424         /* XXX THIS DOESN'T WORK!!! */
 425         time = tmp_time;
 426 #endif
 427
 428 #ifdef APM_FIXUP_CALLTODO
 429         /* Calculate the delta time suspended */
 430         timevalsub(&resume_time, &suspend_time);
 431         /* Fixup the calltodo list with the delta time. */
 432         adjust_timeout_calltodo(&resume_time);
 433 #endif /* APM_FIXUP_CALLTODOK */
 434         crit_exit();
 435 #ifndef APM_FIXUP_CALLTODO
 436         second = resume_time.tv_sec - suspend_time.tv_sec;
 437 #else /* APM_FIXUP_CALLTODO */
 438         /*
 439          * We've already calculated resume_time to be the delta between
 440          * the suspend and the resume.
 441          */
 442         second = resume_time.tv_sec;
 443 #endif /* APM_FIXUP_CALLTODO */
 444         hour = second / 3600;
 445         second %= 3600;
 446         minute = second / 60;
 447         second %= 60;
 448         log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
 449                 hour, minute, second);
 450         return 0;
 451 }
 452
 453 static int
 454 apm_default_suspend(void *arg)
 455 {
 456         crit_enter();
 457         microtime(&diff_time);
 458         inittodr(0);
 459         microtime(&suspend_time);
 460         timevalsub(&diff_time, &suspend_time);
 461         crit_exit();
 462         return 0;
 463 }
 464
 465 static int apm_record_event (struct apm_softc *, u_int);
 466 static void apm_processevent(void);
 467
 468 static u_int apm_op_inprog = 0;
 469
 470 static void
 471 apm_do_suspend(void)
 472 {
 473         struct apm_softc *sc = &apm_softc;
 474         int error;
 475
 476         if (!sc)
 477                 return;
 478
 479         apm_op_inprog = 0;
 480         sc->suspends = sc->suspend_countdown = 0;
 481
 482         if (sc->initialized) {
 483                 error = DEVICE_SUSPEND(root_bus);
 484                 if (error) {
 485                         DEVICE_RESUME(root_bus);
 486                 } else {
 487                         apm_execute_hook(hook[APM_HOOK_SUSPEND]);
 488                         if (apm_suspend_system(PMST_SUSPEND) == 0) {
 489                                 apm_processevent();
 490                         } else {
 491                                 /* Failure, 'resume' the system again */
 492                                 apm_execute_hook(hook[APM_HOOK_RESUME]);
 493                                 DEVICE_RESUME(root_bus);
 494                         }
 495                 }
 496         }
 497 }
 498
 499 static void
 500 apm_do_standby(void)
 501 {
 502         struct apm_softc *sc = &apm_softc;
 503
 504         if (!sc)
 505                 return;
 506
 507         apm_op_inprog = 0;
 508         sc->standbys = sc->standby_countdown = 0;
 509
 510         if (sc->initialized) {
 511                 /*
 512                  * As far as standby, we don't need to execute
 513                  * all of suspend hooks.
 514                  */
 515                 apm_default_suspend(&apm_softc);
 516                 if (apm_suspend_system(PMST_STANDBY) == 0)
 517                         apm_processevent();
 518         }
 519 }
 520
 521 static void
 522 apm_lastreq_notify(void)
 523 {
 524         struct apm_softc *sc = &apm_softc;
 525
 526         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 527         sc->bios.r.ebx = PMDV_ALLDEV;
 528         sc->bios.r.ecx = PMST_LASTREQNOTIFY;
 529         sc->bios.r.edx = 0;
 530         apm_bioscall();
 531 }
 532
 533 static int
 534 apm_lastreq_rejected(void)
 535 {
 536         struct apm_softc *sc = &apm_softc;
 537
 538         if (apm_op_inprog == 0) {
 539                 return 1;       /* no operation in progress */
 540         }
 541
 542         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 543         sc->bios.r.ebx = PMDV_ALLDEV;
 544         sc->bios.r.ecx = PMST_LASTREQREJECT;
 545         sc->bios.r.edx = 0;
 546
 547         if (apm_bioscall()) {
 548                 APM_DPRINT("apm_lastreq_rejected: failed\n");
 549                 return 1;
 550         }
 551         apm_op_inprog = 0;
 552         return 0;
 553 }
 554
 555 /*
 556  * Public interface to the suspend/resume:
 557  *
 558  * Execute suspend and resume hook before and after sleep, respectively.
 559  *
 560  */
 561
 562 void
 563 apm_suspend(int state)
 564 {
 565         struct apm_softc *sc = &apm_softc;
 566
 567         if (!sc->initialized)
 568                 return;
 569
 570         switch (state) {
 571         case PMST_SUSPEND:
 572                 if (sc->suspends)
 573                         return;
 574                 sc->suspends++;
 575                 sc->suspend_countdown = apm_suspend_delay;
 576                 break;
 577         case PMST_STANDBY:
 578                 if (sc->standbys)
 579                         return;
 580                 sc->standbys++;
 581                 sc->standby_countdown = apm_standby_delay;
 582                 break;
 583         default:
 584                 printf("apm_suspend: Unknown Suspend state 0x%x\n", state);
 585                 return;
 586         }
 587
 588         apm_op_inprog++;
 589         apm_lastreq_notify();
 590 }
 591
 592 void
 593 apm_resume(void)
 594 {
 595         struct apm_softc *sc = &apm_softc;
 596
 597         if (!sc)
 598                 return;
 599
 600         if (sc->initialized) {
 601                 apm_execute_hook(hook[APM_HOOK_RESUME]);
 602                 DEVICE_RESUME(root_bus);
 603         }
 604 }
 605
 606
 607 /* get power status per battery */
 608 static int
 609 apm_get_pwstatus(apm_pwstatus_t app)
 610 {
 611         struct apm_softc *sc = &apm_softc;
 612
 613         if (app->ap_device != PMDV_ALLDEV &&
 614             (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
 615                 return 1;
 616
 617         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
 618         sc->bios.r.ebx = app->ap_device;
 619         sc->bios.r.ecx = 0;
 620         sc->bios.r.edx = 0xffff;        /* default to unknown battery time */
 621
 622         if (apm_bioscall())
 623                 return 1;
 624
 625         app->ap_acline    = (sc->bios.r.ebx >> 8) & 0xff;
 626         app->ap_batt_stat = sc->bios.r.ebx & 0xff;
 627         app->ap_batt_flag = (sc->bios.r.ecx >> 8) & 0xff;
 628         app->ap_batt_life = sc->bios.r.ecx & 0xff;
 629         sc->bios.r.edx &= 0xffff;
 630         if (sc->bios.r.edx == 0xffff)   /* Time is unknown */
 631                 app->ap_batt_time = -1;
 632         else if (sc->bios.r.edx & 0x8000)       /* Time is in minutes */
 633                 app->ap_batt_time = (sc->bios.r.edx & 0x7fff) * 60;
 634         else                            /* Time is in seconds */
 635                 app->ap_batt_time = sc->bios.r.edx;
 636
 637         return 0;
 638 }
 639
 640
 641 /* get APM information */
 642 static int
 643 apm_get_info(apm_info_t aip)
 644 {
 645         struct apm_softc *sc = &apm_softc;
 646         struct apm_pwstatus aps;
 647
 648         bzero(&aps, sizeof(aps));
 649         aps.ap_device = PMDV_ALLDEV;
 650         if (apm_get_pwstatus(&aps))
 651                 return 1;
 652
 653         aip->ai_infoversion = 1;
 654         aip->ai_acline      = aps.ap_acline;
 655         aip->ai_batt_stat   = aps.ap_batt_stat;
 656         aip->ai_batt_life   = aps.ap_batt_life;
 657         aip->ai_batt_time   = aps.ap_batt_time;
 658         aip->ai_major       = (u_int)sc->majorversion;
 659         aip->ai_minor       = (u_int)sc->minorversion;
 660         aip->ai_status      = (u_int)sc->active;
 661
 662         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES;
 663         sc->bios.r.ebx = 0;
 664         sc->bios.r.ecx = 0;
 665         sc->bios.r.edx = 0;
 666         if (apm_bioscall()) {
 667                 aip->ai_batteries = -1; /* Unknown */
 668                 aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */
 669         } else {
 670                 aip->ai_batteries = sc->bios.r.ebx & 0xff;
 671                 aip->ai_capabilities = sc->bios.r.ecx & 0xf;
 672         }
 673
 674         bzero(aip->ai_spare, sizeof aip->ai_spare);
 675
 676         return 0;
 677 }
 678
 679
 680 /* inform APM BIOS that CPU is idle */
 681 void
 682 apm_cpu_idle(void)
 683 {
 684         struct apm_softc *sc = &apm_softc;
 685
 686         if (sc->active) {
 687
 688                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE;
 689                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
 690                 (void) apm_bioscall();
 691         }
 692         /*
 693          * Some APM implementation halts CPU in BIOS, whenever
 694          * "CPU-idle" function are invoked, but swtch() of
 695          * FreeBSD halts CPU, therefore, CPU is halted twice
 696          * in the sched loop. It makes the interrupt latency
 697          * terribly long and be able to cause a serious problem
 698          * in interrupt processing. We prevent it by removing
 699          * "hlt" operation from swtch() and managed it under
 700          * APM driver.
 701          */
 702         if (!sc->active || sc->always_halt_cpu)
 703                 __asm("hlt");   /* wait for interrupt */
 704 }
 705
 706 /* inform APM BIOS that CPU is busy */
 707 void
 708 apm_cpu_busy(void)
 709 {
 710         struct apm_softc *sc = &apm_softc;
 711
 712         /*
 713          * The APM specification says this is only necessary if your BIOS
 714          * slows down the processor in the idle task, otherwise it's not
 715          * necessary.
 716          */
 717         if (sc->slow_idle_cpu && sc->active) {
 718
 719                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY;
 720                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
 721                 apm_bioscall();
 722         }
 723 }
 724
 725
 726 /*
 727  * APM timeout routine:
 728  *
 729  * This routine is automatically called by timer once per second.
 730  */
 731
 732 static void
 733 apm_timeout(void *dummy)
 734 {
 735         struct apm_softc *sc = &apm_softc;
 736
 737         if (apm_op_inprog)
 738                 apm_lastreq_notify();
 739
 740         if (sc->standbys && sc->standby_countdown-- <= 0)
 741                 apm_do_standby();
 742
 743         if (sc->suspends && sc->suspend_countdown-- <= 0)
 744                 apm_do_suspend();
 745
 746         if (!sc->bios_busy)
 747                 apm_processevent();
 748
 749         if (sc->active == 1) {
 750                 /* Run slightly more oftan than 1 Hz */
 751                 callout_reset(&apm_timeout_ch, hz - 1, apm_timeout, NULL);
 752         }
 753 }
 754
 755 /* enable APM BIOS */
 756 static void
 757 apm_event_enable(void)
 758 {
 759         struct apm_softc *sc = &apm_softc;
 760
 761         APM_DPRINT("called apm_event_enable()\n");
 762         if (sc->initialized) {
 763                 sc->active = 1;
 764                 callout_init(&apm_timeout_ch);
 765                 apm_timeout(sc);
 766         }
 767 }
 768
 769 /* disable APM BIOS */
 770 static void
 771 apm_event_disable(void)
 772 {
 773         struct apm_softc *sc = &apm_softc;
 774
 775         APM_DPRINT("called apm_event_disable()\n");
 776         if (sc->initialized) {
 777                 callout_stop(&apm_timeout_ch);
 778                 sc->active = 0;
 779         }
 780 }
 781
 782 /* halt CPU in scheduling loop */
 783 static void
 784 apm_halt_cpu(void)
 785 {
 786         struct apm_softc *sc = &apm_softc;
 787
 788         if (sc->initialized)
 789                 sc->always_halt_cpu = 1;
 790 }
 791
 792 /* don't halt CPU in scheduling loop */
 793 static void
 794 apm_not_halt_cpu(void)
 795 {
 796         struct apm_softc *sc = &apm_softc;
 797
 798         if (sc->initialized)
 799                 sc->always_halt_cpu = 0;
 800 }
 801
 802 /* device driver definitions */
 803
 804 /*
 805  * Create "connection point"
 806  */
 807 static void
 808 apm_identify(driver_t *driver, device_t parent)
 809 {
 810         device_t child;
 811
 812         child = BUS_ADD_CHILD(parent, 0, "apm", 0);
 813         if (child == NULL)
 814                 panic("apm_identify");
 815 }
 816
 817 /*
 818  * probe for APM BIOS
 819  */
 820 static int
 821 apm_probe(device_t dev)
 822 {
 823 #define APM_KERNBASE    KERNBASE
 824         struct vm86frame        vmf;
 825         struct apm_softc        *sc = &apm_softc;
 826         int                     disabled, flags;
 827
 828         if (resource_int_value("apm", 0, "disabled", &disabled) == 0
 829             && disabled != 0)
 830                 return ENXIO;
 831
 832         device_set_desc(dev, "APM BIOS");
 833
 834         if ( device_get_unit(dev) > 0 ) {
 835                 printf("apm: Only one APM driver supported.\n");
 836                 return ENXIO;
 837         }
 838
 839         if (resource_int_value("apm", 0, "flags", &flags) != 0)
 840                 flags = 0;
 841
 842         bzero(&vmf, sizeof(struct vm86frame));          /* safety */
 843         bzero(&apm_softc, sizeof(apm_softc));
 844         vmf.vmf_ah = APM_BIOS;
 845         vmf.vmf_al = APM_INSTCHECK;
 846         vmf.vmf_bx = 0;
 847         if (vm86_intcall(APM_INT, &vmf))
 848                 return ENXIO;                   /* APM not found */
 849         if (vmf.vmf_bx != 0x504d) {
 850                 printf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx);
 851                 return ENXIO;
 852         }
 853         if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) {
 854                 printf("apm: protected mode connections are not supported\n");
 855                 return ENXIO;
 856         }
 857
 858         apm_version = vmf.vmf_ax;
 859         sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0);
 860         sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0);
 861         sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0);
 862
 863         vmf.vmf_ah = APM_BIOS;
 864         vmf.vmf_al = APM_DISCONNECT;
 865         vmf.vmf_bx = 0;
 866         vm86_intcall(APM_INT, &vmf);            /* disconnect, just in case */
 867
 868         if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) {
 869                 vmf.vmf_ah = APM_BIOS;
 870                 vmf.vmf_al = APM_PROT32CONNECT;
 871                 vmf.vmf_bx = 0;
 872                 if (vm86_intcall(APM_INT, &vmf)) {
 873                         printf("apm: 32-bit connection error.\n");
 874                         return (ENXIO);
 875                 }
 876                 sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 877                 sc->bios.seg.code32.limit = 0xffff;
 878                 sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 879                 sc->bios.seg.code16.limit = 0xffff;
 880                 sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
 881                 sc->bios.seg.data.limit = 0xffff;
 882                 sc->bios.entry = vmf.vmf_ebx;
 883                 sc->connectmode = APM_PROT32CONNECT;
 884         } else {
 885                 /* use 16-bit connection */
 886                 vmf.vmf_ah = APM_BIOS;
 887                 vmf.vmf_al = APM_PROT16CONNECT;
 888                 vmf.vmf_bx = 0;
 889                 if (vm86_intcall(APM_INT, &vmf)) {
 890                         printf("apm: 16-bit connection error.\n");
 891                         return (ENXIO);
 892                 }
 893                 sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 894                 sc->bios.seg.code16.limit = 0xffff;
 895                 sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 896                 sc->bios.seg.data.limit = 0xffff;
 897                 sc->bios.entry = vmf.vmf_bx;
 898                 sc->connectmode = APM_PROT16CONNECT;
 899         }
 900         return(0);
 901 }
 902
 903
 904 /*
 905  * return 0 if the user will notice and handle the event,
 906  * return 1 if the kernel driver should do so.
 907  */
 908 static int
 909 apm_record_event(struct apm_softc *sc, u_int event_type)
 910 {
 911         struct apm_event_info *evp;
 912
 913         if ((sc->sc_flags & SCFLAG_OPEN) == 0)
 914                 return 1;               /* no user waiting */
 915         if (sc->event_count == APM_NEVENTS)
 916                 return 1;                       /* overflow */
 917         if (sc->event_filter[event_type] == 0)
 918                 return 1;               /* not registered */
 919         evp = &sc->event_list[sc->event_ptr];
 920         sc->event_count++;
 921         sc->event_ptr++;
 922         sc->event_ptr %= APM_NEVENTS;
 923         evp->type = event_type;
 924         evp->index = ++apm_evindex;
 925         selwakeup(&sc->sc_rsel);
 926         return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */
 927 }
 928
 929 /* Process APM event */
 930 static void
 931 apm_processevent(void)
 932 {
 933         int apm_event;
 934         struct apm_softc *sc = &apm_softc;
 935
 936 #define OPMEV_DEBUGMESSAGE(symbol) case symbol:                         \
 937         APM_DPRINT("Received APM Event: " #symbol "\n");
 938
 939         do {
 940                 apm_event = apm_getevent();
 941                 switch (apm_event) {
 942                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
 943                         if (apm_op_inprog == 0) {
 944                             apm_op_inprog++;
 945                             if (apm_record_event(sc, apm_event)) {
 946                                 apm_suspend(PMST_STANDBY);
 947                             }
 948                         }
 949                         break;
 950                     OPMEV_DEBUGMESSAGE(PMEV_USERSTANDBYREQ);
 951                         if (apm_op_inprog == 0) {
 952                             apm_op_inprog++;
 953                             if (apm_record_event(sc, apm_event)) {
 954                                 apm_suspend(PMST_STANDBY);
 955                             }
 956                         }
 957                         break;
 958                     OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
 959                         apm_lastreq_notify();
 960                         if (apm_op_inprog == 0) {
 961                             apm_op_inprog++;
 962                             if (apm_record_event(sc, apm_event)) {
 963                                 apm_do_suspend();
 964                             }
 965                         }
 966                         return; /* XXX skip the rest */
 967                     OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
 968                         apm_lastreq_notify();
 969                         if (apm_op_inprog == 0) {
 970                             apm_op_inprog++;
 971                             if (apm_record_event(sc, apm_event)) {
 972                                 apm_do_suspend();
 973                             }
 974                         }
 975                         return; /* XXX skip the rest */
 976                     OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
 977                         apm_do_suspend();
 978                         break;
 979                     OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
 980                         apm_record_event(sc, apm_event);
 981                         apm_resume();
 982                         break;
 983                     OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
 984                         apm_record_event(sc, apm_event);
 985                         apm_resume();
 986                         break;
 987                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
 988                         apm_record_event(sc, apm_event);
 989                         apm_resume();
 990                         break;
 991                     OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
 992                         if (apm_record_event(sc, apm_event)) {
 993                             apm_battery_low();
 994                             apm_suspend(PMST_SUSPEND);
 995                         }
 996                         break;
 997                     OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
 998                         apm_record_event(sc, apm_event);
 999                         break;
1000                     OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
1001                         apm_record_event(sc, apm_event);
1002                         inittodr(0);    /* adjust time to RTC */
1003                         break;
1004                     OPMEV_DEBUGMESSAGE(PMEV_CAPABILITIESCHANGE);
1005                         apm_record_event(sc, apm_event);
1006                         break;
1007                     case PMEV_NOEVENT:
1008                         break;
1009                     default:
1010                         printf("Unknown Original APM Event 0x%x\n", apm_event);
1011                             break;
1012                 }
1013         } while (apm_event != PMEV_NOEVENT);
1014 }
1015
1016 /*
1017  * Attach APM:
1018  *
1019  * Initialize APM driver
1020  */
1021
1022 static int
1023 apm_attach(device_t dev)
1024 {
1025         struct apm_softc        *sc = &apm_softc;
1026         int                     flags;
1027         int                     drv_version;
1028
1029         if (resource_int_value("apm", 0, "flags", &flags) != 0)
1030                 flags = 0;
1031
1032         sc->initialized = 0;
1033
1034         /* Must be externally enabled */
1035         sc->active = 0;
1036
1037         /* Always call HLT in idle loop */
1038         sc->always_halt_cpu = 1;
1039
1040         getenv_int("debug.apm_debug", &apm_debug);
1041
1042         /* print bootstrap messages */
1043         APM_DPRINT("apm: APM BIOS version %04lx\n",  apm_version);
1044         APM_DPRINT("apm: Code16 0x%08x, Data 0x%08x\n",
1045             sc->bios.seg.code16.base, sc->bios.seg.data.base);
1046         APM_DPRINT("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
1047             sc->bios.entry, is_enabled(sc->slow_idle_cpu),
1048             is_enabled(!sc->disabled));
1049         APM_DPRINT("apm: CS_limit=0x%x, DS_limit=0x%x\n",
1050             sc->bios.seg.code16.limit, sc->bios.seg.data.limit);
1051
1052         /*
1053          * In one test, apm bios version was 1.02; an attempt to register
1054          * a 1.04 driver resulted in a 1.00 connection!  Registering a
1055          * 1.02 driver resulted in a 1.02 connection.
1056          */
1057         drv_version = apm_version > 0x102 ? 0x102 : apm_version;
1058         for (; drv_version > 0x100; drv_version--)
1059                 if (apm_driver_version(drv_version) == 0)
1060                         break;
1061         sc->minorversion = ((drv_version & 0x00f0) >>  4) * 10 +
1062                 ((drv_version & 0x000f) >> 0);
1063         sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 +
1064                 ((apm_version & 0x0f00) >> 8);
1065
1066         sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
1067
1068         if (sc->intversion >= INTVERSION(1, 1))
1069                 APM_DPRINT("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
1070         device_printf(dev, "found APM BIOS v%ld.%ld, connected at v%d.%d\n",
1071                ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8),
1072                ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0),
1073                sc->majorversion, sc->minorversion);
1074
1075
1076         APM_DPRINT("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
1077         /* enable power management */
1078         if (sc->disabled) {
1079                 if (apm_enable_disable_pm(1)) {
1080                         APM_DPRINT("apm: *Warning* enable function failed! [%x]\n",
1081                             (sc->bios.r.eax >> 8) & 0xff);
1082                 }
1083         }
1084
1085         /* engage power managment (APM 1.1 or later) */
1086         if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
1087                 if (apm_engage_disengage_pm(1)) {
1088                         APM_DPRINT("apm: *Warning* engage function failed err=[%x]",
1089                             (sc->bios.r.eax >> 8) & 0xff);
1090                         APM_DPRINT(" (Docked or using external power?).\n");
1091                 }
1092         }
1093
1094         /* default suspend hook */
1095         sc->sc_suspend.ah_fun = apm_default_suspend;
1096         sc->sc_suspend.ah_arg = sc;
1097         sc->sc_suspend.ah_name = "default suspend";
1098         sc->sc_suspend.ah_order = APM_MAX_ORDER;
1099
1100         /* default resume hook */
1101         sc->sc_resume.ah_fun = apm_default_resume;
1102         sc->sc_resume.ah_arg = sc;
1103         sc->sc_resume.ah_name = "default resume";
1104         sc->sc_resume.ah_order = APM_MIN_ORDER;
1105
1106         apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
1107         apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
1108
1109         /* Power the system off using APM */
1110         EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL,
1111                               SHUTDOWN_PRI_LAST);
1112
1113         sc->initialized = 1;
1114
1115         cdevsw_add(&apm_cdevsw, 0, 0);
1116         make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0660, "apm");
1117         make_dev(&apm_cdevsw, 8, UID_ROOT, GID_OPERATOR, 0660, "apmctl");
1118         return 0;
1119 }
1120
1121 static int
1122 apmopen(dev_t dev, int flag, int fmt, d_thread_t *td)
1123 {
1124         struct apm_softc *sc = &apm_softc;
1125         int ctl = APMDEV(dev);
1126
1127         if (!sc->initialized)
1128                 return (ENXIO);
1129
1130         switch (ctl) {
1131         case APMDEV_CTL:
1132                 if (!(flag & FWRITE))
1133                         return EINVAL;
1134                 if (sc->sc_flags & SCFLAG_OCTL)
1135                         return EBUSY;
1136                 sc->sc_flags |= SCFLAG_OCTL;
1137                 bzero(sc->event_filter, sizeof sc->event_filter);
1138                 break;
1139         case APMDEV_NORMAL:
1140                 sc->sc_flags |= SCFLAG_ONORMAL;
1141                 break;
1142         default:
1143                 return ENXIO;
1144                 break;
1145         }
1146         return 0;
1147 }
1148
1149 static int
1150 apmclose(dev_t dev, int flag, int fmt, d_thread_t *td)
1151 {
1152         struct apm_softc *sc = &apm_softc;
1153         int ctl = APMDEV(dev);
1154
1155         switch (ctl) {
1156         case APMDEV_CTL:
1157                 apm_lastreq_rejected();
1158                 sc->sc_flags &= ~SCFLAG_OCTL;
1159                 bzero(sc->event_filter, sizeof sc->event_filter);
1160                 break;
1161         case APMDEV_NORMAL:
1162                 sc->sc_flags &= ~SCFLAG_ONORMAL;
1163                 break;
1164         }
1165         if ((sc->sc_flags & SCFLAG_OPEN) == 0) {
1166                 sc->event_count = 0;
1167                 sc->event_ptr = 0;
1168         }
1169         return 0;
1170 }
1171
1172 static int
1173 apmioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, d_thread_t *td)
1174 {
1175         struct apm_softc *sc = &apm_softc;
1176         struct apm_bios_arg *args;
1177         int error = 0;
1178         int ret;
1179         int newstate;
1180
1181         if (!sc->initialized)
1182                 return (ENXIO);
1183         APM_DPRINT("APM ioctl: cmd = 0x%lx\n", cmd);
1184         switch (cmd) {
1185         case APMIO_SUSPEND:
1186                 if (!(flag & FWRITE))
1187                         return (EPERM);
1188                 if (sc->active)
1189                         apm_suspend(PMST_SUSPEND);
1190                 else
1191                         error = EINVAL;
1192                 break;
1193
1194         case APMIO_STANDBY:
1195                 if (!(flag & FWRITE))
1196                         return (EPERM);
1197                 if (sc->active)
1198                         apm_suspend(PMST_STANDBY);
1199                 else
1200                         error = EINVAL;
1201                 break;
1202
1203         case APMIO_GETINFO_OLD:
1204                 {
1205                         struct apm_info info;
1206                         apm_info_old_t aiop;
1207
1208                         if (apm_get_info(&info))
1209                                 error = ENXIO;
1210                         aiop = (apm_info_old_t)addr;
1211                         aiop->ai_major = info.ai_major;
1212                         aiop->ai_minor = info.ai_minor;
1213                         aiop->ai_acline = info.ai_acline;
1214                         aiop->ai_batt_stat = info.ai_batt_stat;
1215                         aiop->ai_batt_life = info.ai_batt_life;
1216                         aiop->ai_status = info.ai_status;
1217                 }
1218                 break;
1219         case APMIO_GETINFO:
1220                 if (apm_get_info((apm_info_t)addr))
1221                         error = ENXIO;
1222                 break;
1223         case APMIO_GETPWSTATUS:
1224                 if (apm_get_pwstatus((apm_pwstatus_t)addr))
1225                         error = ENXIO;
1226                 break;
1227         case APMIO_ENABLE:
1228                 if (!(flag & FWRITE))
1229                         return (EPERM);
1230                 apm_event_enable();
1231                 break;
1232         case APMIO_DISABLE:
1233                 if (!(flag & FWRITE))
1234                         return (EPERM);
1235                 apm_event_disable();
1236                 break;
1237         case APMIO_HALTCPU:
1238                 if (!(flag & FWRITE))
1239                         return (EPERM);
1240                 apm_halt_cpu();
1241                 break;
1242         case APMIO_NOTHALTCPU:
1243                 if (!(flag & FWRITE))
1244                         return (EPERM);
1245                 apm_not_halt_cpu();
1246                 break;
1247         case APMIO_DISPLAY:
1248                 if (!(flag & FWRITE))
1249                         return (EPERM);
1250                 newstate = *(int *)addr;
1251                 if (apm_display(newstate))
1252                         error = ENXIO;
1253                 break;
1254         case APMIO_BIOS:
1255                 if (!(flag & FWRITE))
1256                         return (EPERM);
1257                 /* XXX compatibility with the old interface */
1258                 args = (struct apm_bios_arg *)addr;
1259                 sc->bios.r.eax = args->eax;
1260                 sc->bios.r.ebx = args->ebx;
1261                 sc->bios.r.ecx = args->ecx;
1262                 sc->bios.r.edx = args->edx;
1263                 sc->bios.r.esi = args->esi;
1264                 sc->bios.r.edi = args->edi;
1265                 if ((ret = apm_bioscall())) {
1266                         /*
1267                          * Return code 1 means bios call was unsuccessful.
1268                          * Error code is stored in %ah.
1269                          * Return code -1 means bios call was unsupported
1270                          * in the APM BIOS version.
1271                          */
1272                         if (ret == -1) {
1273                                 error = EINVAL;
1274                         }
1275                 } else {
1276                         /*
1277                          * Return code 0 means bios call was successful.
1278                          * We need only %al and can discard %ah.
1279                          */
1280                         sc->bios.r.eax &= 0xff;
1281                 }
1282                 args->eax = sc->bios.r.eax;
1283                 args->ebx = sc->bios.r.ebx;
1284                 args->ecx = sc->bios.r.ecx;
1285                 args->edx = sc->bios.r.edx;
1286                 args->esi = sc->bios.r.esi;
1287                 args->edi = sc->bios.r.edi;
1288                 break;
1289         default:
1290                 error = EINVAL;
1291                 break;
1292         }
1293
1294         /* for /dev/apmctl */
1295         if (APMDEV(dev) == APMDEV_CTL) {
1296                 struct apm_event_info *evp;
1297                 int i;
1298
1299                 error = 0;
1300                 switch (cmd) {
1301                 case APMIO_NEXTEVENT:
1302                         if (!sc->event_count) {
1303                                 error = EAGAIN;
1304                         } else {
1305                                 evp = (struct apm_event_info *)addr;
1306                                 i = sc->event_ptr + APM_NEVENTS - sc->event_count;
1307                                 i %= APM_NEVENTS;
1308                                 *evp = sc->event_list[i];
1309                                 sc->event_count--;
1310                         }
1311                         break;
1312                 case APMIO_REJECTLASTREQ:
1313                         if (apm_lastreq_rejected()) {
1314                                 error = EINVAL;
1315                         }
1316                         break;
1317                 default:
1318                         error = EINVAL;
1319                         break;
1320                 }
1321         }
1322
1323         return error;
1324 }
1325
1326 static int
1327 apmwrite(dev_t dev, struct uio *uio, int ioflag)
1328 {
1329         struct apm_softc *sc = &apm_softc;
1330         u_int event_type;
1331         int error;
1332         u_char enabled;
1333
1334         if (APMDEV(dev) != APMDEV_CTL)
1335                 return(ENODEV);
1336         if (uio->uio_resid != sizeof(u_int))
1337                 return(E2BIG);
1338
1339         if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio)))
1340                 return(error);
1341
1342         if (event_type < 0 || event_type >= APM_NPMEV)
1343                 return(EINVAL);
1344
1345         if (sc->event_filter[event_type] == 0) {
1346                 enabled = 1;
1347         } else {
1348                 enabled = 0;
1349         }
1350         sc->event_filter[event_type] = enabled;
1351         APM_DPRINT("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled));
1352
1353         return uio->uio_resid;
1354 }
1355
1356 static int
1357 apmpoll(dev_t dev, int events, d_thread_t *td)
1358 {
1359         struct apm_softc *sc = &apm_softc;
1360         int revents = 0;
1361
1362         if (events & (POLLIN | POLLRDNORM)) {
1363                 if (sc->event_count) {
1364                         revents |= events & (POLLIN | POLLRDNORM);
1365                 } else {
1366                         selrecord(td, &sc->sc_rsel);
1367                 }
1368         }
1369
1370         return (revents);
1371 }
1372
1373 static device_method_t apm_methods[] = {
1374         /* Device interface */
1375         DEVMETHOD(device_identify,      apm_identify),
1376         DEVMETHOD(device_probe,         apm_probe),
1377         DEVMETHOD(device_attach,        apm_attach),
1378
1379         { 0, 0 }
1380 };
1381
1382 static driver_t apm_driver = {
1383         "apm",
1384         apm_methods,
1385         1,                      /* no softc (XXX) */
1386 };
1387
1388 static devclass_t apm_devclass;
1389
1390 DRIVER_MODULE(apm, nexus, apm_driver, apm_devclass, 0, 0);