sys/i386/bios/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
  19 #include <sys/cdefs.h>
  20 __FBSDID("$FreeBSD$");
  21
  22 #include <sys/param.h>
  23 #include <sys/systm.h>
  24 #include <sys/bus.h>
  25 #include <sys/conf.h>
  26 #include <sys/condvar.h>
  27 #include <sys/eventhandler.h>
  28 #include <sys/fcntl.h>
  29 #include <sys/kernel.h>
  30 #include <sys/kthread.h>
  31 #include <sys/lock.h>
  32 #include <sys/module.h>
  33 #include <sys/mutex.h>
  34 #include <sys/poll.h>
  35 #include <sys/power.h>
  36 #include <sys/reboot.h>
  37 #include <sys/selinfo.h>
  38 #include <sys/signalvar.h>
  39 #include <sys/sysctl.h>
  40 #include <sys/syslog.h>
  41 #include <sys/time.h>
  42 #include <sys/uio.h>
  43
  44 #include <machine/apm_bios.h>
  45 #include <machine/clock.h>
  46 #include <machine/endian.h>
  47 #include <machine/pc/bios.h>
  48 #include <machine/cpufunc.h>
  49 #include <machine/segments.h>
  50 #include <machine/stdarg.h>
  51 #include <machine/vm86.h>
  52
  53 #include <machine/bus.h>
  54 #include <machine/resource.h>
  55 #include <sys/rman.h>
  56
  57 #include <vm/vm.h>
  58 #include <vm/pmap.h>
  59 #include <vm/vm_param.h>
  60
  61 #include <i386/bios/apm.h>
  62 #include <isa/rtc.h>
  63
  64 /* Used by the apm_saver screen saver module */
  65 int apm_display(int newstate);
  66 struct apm_softc apm_softc;
  67
  68 static void apm_resume(void);
  69 static int apm_bioscall(void);
  70 static int apm_check_function_supported(u_int version, u_int func);
  71
  72 static int apm_pm_func(u_long, void*, ...);
  73
  74 static u_long   apm_version;
  75
  76 int     apm_evindex;
  77
  78 #define SCFLAG_ONORMAL  0x0000001
  79 #define SCFLAG_OCTL     0x0000002
  80 #define SCFLAG_OPEN     (SCFLAG_ONORMAL|SCFLAG_OCTL)
  81
  82 #define APMDEV_NORMAL   0
  83 #define APMDEV_CTL      1
  84
  85 #ifdef PC98
  86 extern int bios32_apm98(struct bios_regs *, u_int, u_short);
  87
  88 /* PC98's SMM definition */
  89 #define APM_NECSMM_PORT         0x6b8e
  90 #define APM_NECSMM_PORTSZ       1
  91 #define APM_NECSMM_EN           0x10
  92 static __inline void apm_enable_smm(struct apm_softc *);
  93 static __inline void apm_disable_smm(struct apm_softc *);
  94 int apm_necsmm_addr;
  95 u_int32_t apm_necsmm_mask;
  96 #endif
  97
  98 static struct apmhook   *hook[NAPM_HOOK];               /* XXX */
  99
 100 #define is_enabled(foo) ((foo) ? "enabled" : "disabled")
 101
 102 /* Map version number to integer (keeps ordering of version numbers) */
 103 #define INTVERSION(major, minor)        ((major)*100 + (minor))
 104
 105 static d_open_t apmopen;
 106 static d_close_t apmclose;
 107 static d_write_t apmwrite;
 108 static d_ioctl_t apmioctl;
 109 static d_poll_t apmpoll;
 110
 111 static struct cdevsw apm_cdevsw = {
 112         .d_version =    D_VERSION,
 113         .d_flags =      D_NEEDGIANT,
 114         .d_open =       apmopen,
 115         .d_close =      apmclose,
 116         .d_write =      apmwrite,
 117         .d_ioctl =      apmioctl,
 118         .d_poll =       apmpoll,
 119         .d_name =       "apm",
 120 };
 121
 122 static int apm_suspend_delay = 1;
 123 static int apm_standby_delay = 1;
 124 static int apm_swab_batt_minutes = 0;
 125 static int apm_debug = 0;
 126
 127 #define APM_DPRINT(args...) do  {                                       \
 128         if (apm_debug) {                                                \
 129                 printf(args);                                           \
 130         }                                                               \
 131 } while (0)
 132
 133 SYSCTL_INT(_machdep, OID_AUTO, apm_suspend_delay, CTLFLAG_RW, &apm_suspend_delay, 1, "");
 134 SYSCTL_INT(_machdep, OID_AUTO, apm_standby_delay, CTLFLAG_RW, &apm_standby_delay, 1, "");
 135 SYSCTL_INT(_debug, OID_AUTO, apm_debug, CTLFLAG_RW, &apm_debug, 0, "");
 136
 137 SYSCTL_INT(_machdep, OID_AUTO, apm_swab_batt_minutes, CTLFLAG_RWTUN,
 138            &apm_swab_batt_minutes, 0, "Byte swap battery time value.");
 139
 140 #ifdef PC98
 141 static __inline void
 142 apm_enable_smm(sc)
 143         struct apm_softc *sc;
 144 {
 145         bus_space_tag_t iot = sc->sc_iot;
 146         bus_space_handle_t ioh = sc->sc_ioh;
 147         if (apm_necsmm_addr != 0)
 148                 bus_space_write_1(iot, ioh, 0,
 149                           (bus_space_read_1(iot, ioh, 0) | ~apm_necsmm_mask));
 150 }
 151
 152 static __inline void
 153 apm_disable_smm(sc)
 154         struct apm_softc *sc;
 155 {
 156         bus_space_tag_t iot = sc->sc_iot;
 157         bus_space_handle_t ioh = sc->sc_ioh;
 158         if (apm_necsmm_addr != 0)
 159                 bus_space_write_1(iot, ioh, 0,
 160                           (bus_space_read_1(iot, ioh, 0) & apm_necsmm_mask));
 161 }
 162 #endif
 163
 164 /*
 165  * return  0 if the function successfull,
 166  * return  1 if the function unsuccessfull,
 167  * return -1 if the function unsupported.
 168  */
 169 static int
 170 apm_bioscall(void)
 171 {
 172         struct apm_softc *sc = &apm_softc;
 173         int errno = 0;
 174         u_int apm_func = sc->bios.r.eax & 0xff;
 175
 176         if (!apm_check_function_supported(sc->intversion, apm_func)) {
 177                 APM_DPRINT("apm_bioscall: function 0x%x is not supported in v%d.%d\n",
 178                     apm_func, sc->majorversion, sc->minorversion);
 179                 return (-1);
 180         }
 181
 182         sc->bios_busy = 1;
 183 #ifdef  PC98
 184         set_bios_selectors(&sc->bios.seg, BIOSCODE_FLAG | BIOSDATA_FLAG);
 185         if (bios32_apm98(&sc->bios.r, sc->bios.entry,
 186             GSEL(GBIOSCODE32_SEL, SEL_KPL)) != 0)
 187                 return 1;
 188 #else
 189         if (sc->connectmode == APM_PROT32CONNECT) {
 190                 set_bios_selectors(&sc->bios.seg,
 191                                    BIOSCODE_FLAG | BIOSDATA_FLAG);
 192                 errno = bios32(&sc->bios.r,
 193                                sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL));
 194         } else {
 195                 errno = bios16(&sc->bios, NULL);
 196         }
 197 #endif
 198         sc->bios_busy = 0;
 199         return (errno);
 200 }
 201
 202 /* check whether APM function is supported (1)  or not (0). */
 203 static int
 204 apm_check_function_supported(u_int version, u_int func)
 205 {
 206         /* except driver version */
 207         if (func == APM_DRVVERSION) {
 208                 return (1);
 209         }
 210 #ifdef PC98
 211         if (func == APM_GETPWSTATUS) {
 212                 return (1);
 213         }
 214 #endif
 215
 216         switch (version) {
 217         case INTVERSION(1, 0):
 218                 if (func > APM_GETPMEVENT) {
 219                         return (0); /* not supported */
 220                 }
 221                 break;
 222         case INTVERSION(1, 1):
 223                 if (func > APM_ENGAGEDISENGAGEPM &&
 224                     func < APM_OEMFUNC) {
 225                         return (0); /* not supported */
 226                 }
 227                 break;
 228         case INTVERSION(1, 2):
 229                 break;
 230         }
 231
 232         return (1); /* supported */
 233 }
 234
 235 /* enable/disable power management */
 236 static int
 237 apm_enable_disable_pm(int enable)
 238 {
 239         struct apm_softc *sc = &apm_softc;
 240
 241         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
 242
 243         if (sc->intversion >= INTVERSION(1, 1))
 244                 sc->bios.r.ebx  = PMDV_ALLDEV;
 245         else
 246                 sc->bios.r.ebx  = 0xffff;       /* APM version 1.0 only */
 247         sc->bios.r.ecx  = enable;
 248         sc->bios.r.edx = 0;
 249         return (apm_bioscall());
 250 }
 251
 252 /* register driver version (APM 1.1 or later) */
 253 static int
 254 apm_driver_version(int version)
 255 {
 256         struct apm_softc *sc = &apm_softc;
 257
 258         sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION;
 259         sc->bios.r.ebx  = 0x0;
 260         sc->bios.r.ecx  = version;
 261         sc->bios.r.edx = 0;
 262
 263         if (apm_bioscall() == 0 && sc->bios.r.eax == version)
 264                 return (0);
 265
 266         /* Some old BIOSes don't return the connection version in %ax. */
 267         if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION))
 268                 return (0);
 269
 270         return (1);
 271 }
 272
 273 /* engage/disengage power management (APM 1.1 or later) */
 274 static int
 275 apm_engage_disengage_pm(int engage)
 276 {
 277         struct apm_softc *sc = &apm_softc;
 278
 279         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
 280         sc->bios.r.ebx = PMDV_ALLDEV;
 281         sc->bios.r.ecx = engage;
 282         sc->bios.r.edx = 0;
 283         return (apm_bioscall());
 284 }
 285
 286 /* get PM event */
 287 static u_int
 288 apm_getevent(void)
 289 {
 290         struct apm_softc *sc = &apm_softc;
 291
 292         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT;
 293
 294         sc->bios.r.ebx = 0;
 295         sc->bios.r.ecx = 0;
 296         sc->bios.r.edx = 0;
 297         if (apm_bioscall())
 298                 return (PMEV_NOEVENT);
 299         return (sc->bios.r.ebx & 0xffff);
 300 }
 301
 302 /* suspend entire system */
 303 static int
 304 apm_suspend_system(int state)
 305 {
 306         struct apm_softc *sc = &apm_softc;
 307
 308         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 309         sc->bios.r.ebx = PMDV_ALLDEV;
 310         sc->bios.r.ecx = state;
 311         sc->bios.r.edx = 0;
 312
 313 #ifdef PC98
 314         apm_disable_smm(sc);
 315 #endif
 316         if (apm_bioscall()) {
 317                 printf("Entire system suspend failure: errcode = %d\n",
 318                        0xff & (sc->bios.r.eax >> 8));
 319                 return 1;
 320         }
 321 #ifdef PC98
 322         apm_enable_smm(sc);
 323 #endif
 324         return 0;
 325 }
 326
 327 /* Display control */
 328 /*
 329  * Experimental implementation: My laptop machine can't handle this function
 330  * If your laptop can control the display via APM, please inform me.
 331  *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
 332  */
 333 int
 334 apm_display(int newstate)
 335 {
 336         struct apm_softc *sc = &apm_softc;
 337
 338         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 339         sc->bios.r.ebx = PMDV_DISP0;
 340         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
 341         sc->bios.r.edx = 0;
 342         if (apm_bioscall() == 0) {
 343                 return 0;
 344         }
 345
 346         /* If failed, then try to blank all display devices instead. */
 347         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 348         sc->bios.r.ebx = PMDV_DISPALL;  /* all display devices */
 349         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
 350         sc->bios.r.edx = 0;
 351         if (apm_bioscall() == 0) {
 352                 return 0;
 353         }
 354         printf("Display off failure: errcode = %d\n",
 355                0xff & (sc->bios.r.eax >> 8));
 356         return 1;
 357 }
 358
 359 /*
 360  * Turn off the entire system.
 361  */
 362 static void
 363 apm_power_off(void *junk, int howto)
 364 {
 365         struct apm_softc *sc = &apm_softc;
 366
 367         /* Not halting powering off, or not active */
 368         if (!(howto & RB_POWEROFF) || !apm_softc.active)
 369                 return;
 370         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 371         sc->bios.r.ebx = PMDV_ALLDEV;
 372         sc->bios.r.ecx = PMST_OFF;
 373         sc->bios.r.edx = 0;
 374         (void) apm_bioscall();
 375 }
 376
 377 /* APM Battery low handler */
 378 static void
 379 apm_battery_low(void)
 380 {
 381         printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
 382 }
 383
 384 /* APM hook manager */
 385 static struct apmhook *
 386 apm_add_hook(struct apmhook **list, struct apmhook *ah)
 387 {
 388         int s;
 389         struct apmhook *p, *prev;
 390
 391         APM_DPRINT("Add hook \"%s\"\n", ah->ah_name);
 392
 393         s = splhigh();
 394         if (ah == NULL)
 395                 panic("illegal apm_hook!");
 396         prev = NULL;
 397         for (p = *list; p != NULL; prev = p, p = p->ah_next)
 398                 if (p->ah_order > ah->ah_order)
 399                         break;
 400
 401         if (prev == NULL) {
 402                 ah->ah_next = *list;
 403                 *list = ah;
 404         } else {
 405                 ah->ah_next = prev->ah_next;
 406                 prev->ah_next = ah;
 407         }
 408         splx(s);
 409         return ah;
 410 }
 411
 412 static void
 413 apm_del_hook(struct apmhook **list, struct apmhook *ah)
 414 {
 415         int s;
 416         struct apmhook *p, *prev;
 417
 418         s = splhigh();
 419         prev = NULL;
 420         for (p = *list; p != NULL; prev = p, p = p->ah_next)
 421                 if (p == ah)
 422                         goto deleteit;
 423         panic("Tried to delete unregistered apm_hook.");
 424         goto nosuchnode;
 425 deleteit:
 426         if (prev != NULL)
 427                 prev->ah_next = p->ah_next;
 428         else
 429                 *list = p->ah_next;
 430 nosuchnode:
 431         splx(s);
 432 }
 433
 434
 435 /* APM driver calls some functions automatically */
 436 static void
 437 apm_execute_hook(struct apmhook *list)
 438 {
 439         struct apmhook *p;
 440
 441         for (p = list; p != NULL; p = p->ah_next) {
 442                 APM_DPRINT("Execute APM hook \"%s.\"\n", p->ah_name);
 443                 if ((*(p->ah_fun))(p->ah_arg))
 444                         printf("Warning: APM hook \"%s\" failed", p->ah_name);
 445         }
 446 }
 447
 448
 449 /* establish an apm hook */
 450 struct apmhook *
 451 apm_hook_establish(int apmh, struct apmhook *ah)
 452 {
 453         if (apmh < 0 || apmh >= NAPM_HOOK)
 454                 return NULL;
 455
 456         return apm_add_hook(&hook[apmh], ah);
 457 }
 458
 459 /* disestablish an apm hook */
 460 void
 461 apm_hook_disestablish(int apmh, struct apmhook *ah)
 462 {
 463         if (apmh < 0 || apmh >= NAPM_HOOK)
 464                 return;
 465
 466         apm_del_hook(&hook[apmh], ah);
 467 }
 468
 469 static int apm_record_event(struct apm_softc *, u_int);
 470 static void apm_processevent(void);
 471
 472 static u_int apm_op_inprog = 0;
 473
 474 static void
 475 apm_do_suspend(void)
 476 {
 477         struct apm_softc *sc = &apm_softc;
 478         int error;
 479
 480         if (sc == NULL || sc->initialized == 0)
 481                 return;
 482
 483         apm_op_inprog = 0;
 484         sc->suspends = sc->suspend_countdown = 0;
 485
 486         EVENTHANDLER_INVOKE(power_suspend);
 487
 488         /*
 489          * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since
 490          * non-MPSAFE drivers need this.
 491          */
 492         mtx_lock(&Giant);
 493         error = DEVICE_SUSPEND(root_bus);
 494         if (error)
 495                 goto backout;
 496
 497         apm_execute_hook(hook[APM_HOOK_SUSPEND]);
 498         if (apm_suspend_system(PMST_SUSPEND) == 0) {
 499                 sc->suspending = 1;
 500                 apm_processevent();
 501                 mtx_unlock(&Giant);
 502                 return;
 503         }
 504
 505         /* Failure, 'resume' the system again */
 506         apm_execute_hook(hook[APM_HOOK_RESUME]);
 507         DEVICE_RESUME(root_bus);
 508 backout:
 509         mtx_unlock(&Giant);
 510         EVENTHANDLER_INVOKE(power_resume);
 511 }
 512
 513 static void
 514 apm_do_standby(void)
 515 {
 516         struct apm_softc *sc = &apm_softc;
 517
 518         if (sc == NULL || sc->initialized == 0)
 519                 return;
 520
 521         apm_op_inprog = 0;
 522         sc->standbys = sc->standby_countdown = 0;
 523
 524         /*
 525          * As far as standby, we don't need to execute
 526          * all of suspend hooks.
 527          */
 528         if (apm_suspend_system(PMST_STANDBY) == 0)
 529                 apm_processevent();
 530         return;
 531 }
 532
 533 static void
 534 apm_lastreq_notify(void)
 535 {
 536         struct apm_softc *sc = &apm_softc;
 537
 538         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 539         sc->bios.r.ebx = PMDV_ALLDEV;
 540         sc->bios.r.ecx = PMST_LASTREQNOTIFY;
 541         sc->bios.r.edx = 0;
 542         apm_bioscall();
 543 }
 544
 545 static int
 546 apm_lastreq_rejected(void)
 547 {
 548         struct apm_softc *sc = &apm_softc;
 549
 550         if (apm_op_inprog == 0) {
 551                 return 1;       /* no operation in progress */
 552         }
 553
 554         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 555         sc->bios.r.ebx = PMDV_ALLDEV;
 556         sc->bios.r.ecx = PMST_LASTREQREJECT;
 557         sc->bios.r.edx = 0;
 558
 559         if (apm_bioscall()) {
 560                 APM_DPRINT("apm_lastreq_rejected: failed\n");
 561                 return 1;
 562         }
 563         apm_op_inprog = 0;
 564         return 0;
 565 }
 566
 567 /*
 568  * Public interface to the suspend/resume:
 569  *
 570  * Execute suspend and resume hook before and after sleep, respectively.
 571  *
 572  */
 573
 574 void
 575 apm_suspend(int state)
 576 {
 577         struct apm_softc *sc = &apm_softc;
 578
 579         if (sc == NULL || sc->initialized == 0)
 580                 return;
 581
 582         switch (state) {
 583         case PMST_SUSPEND:
 584                 if (sc->suspends)
 585                         return;
 586                 sc->suspends++;
 587                 sc->suspend_countdown = apm_suspend_delay;
 588                 break;
 589         case PMST_STANDBY:
 590                 if (sc->standbys)
 591                         return;
 592                 sc->standbys++;
 593                 sc->standby_countdown = apm_standby_delay;
 594                 break;
 595         default:
 596                 printf("apm_suspend: Unknown Suspend state 0x%x\n", state);
 597                 return;
 598         }
 599
 600         apm_op_inprog++;
 601         apm_lastreq_notify();
 602 }
 603
 604 static void
 605 apm_resume(void)
 606 {
 607         struct apm_softc *sc = &apm_softc;
 608
 609         if (sc == NULL || sc->initialized == 0 || sc->suspending == 0)
 610                 return;
 611
 612         sc->suspending = 0;
 613         apm_execute_hook(hook[APM_HOOK_RESUME]);
 614         mtx_lock(&Giant);
 615         DEVICE_RESUME(root_bus);
 616         mtx_unlock(&Giant);
 617         EVENTHANDLER_INVOKE(power_resume);
 618 }
 619
 620
 621 /* get power status per battery */
 622 static int
 623 apm_get_pwstatus(apm_pwstatus_t app)
 624 {
 625         struct apm_softc *sc = &apm_softc;
 626
 627         if (app->ap_device != PMDV_ALLDEV &&
 628             (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
 629                 return 1;
 630
 631         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
 632         sc->bios.r.ebx = app->ap_device;
 633         sc->bios.r.ecx = 0;
 634         sc->bios.r.edx = 0xffff;        /* default to unknown battery time */
 635
 636         if (apm_bioscall())
 637                 return 1;
 638
 639         app->ap_acline    = (sc->bios.r.ebx >> 8) & 0xff;
 640         app->ap_batt_stat = sc->bios.r.ebx & 0xff;
 641         app->ap_batt_flag = (sc->bios.r.ecx >> 8) & 0xff;
 642         app->ap_batt_life = sc->bios.r.ecx & 0xff;
 643         sc->bios.r.edx &= 0xffff;
 644         if (apm_swab_batt_minutes)
 645                 sc->bios.r.edx = __bswap16(sc->bios.r.edx) | 0x8000;
 646         if (sc->bios.r.edx == 0xffff)   /* Time is unknown */
 647                 app->ap_batt_time = -1;
 648         else if (sc->bios.r.edx & 0x8000)       /* Time is in minutes */
 649                 app->ap_batt_time = (sc->bios.r.edx & 0x7fff) * 60;
 650         else                            /* Time is in seconds */
 651                 app->ap_batt_time = sc->bios.r.edx;
 652
 653         return 0;
 654 }
 655
 656
 657 /* get APM information */
 658 static int
 659 apm_get_info(apm_info_t aip)
 660 {
 661         struct apm_softc *sc = &apm_softc;
 662         struct apm_pwstatus aps;
 663
 664         bzero(&aps, sizeof(aps));
 665         aps.ap_device = PMDV_ALLDEV;
 666         if (apm_get_pwstatus(&aps))
 667                 return 1;
 668
 669         aip->ai_infoversion = 1;
 670         aip->ai_acline      = aps.ap_acline;
 671         aip->ai_batt_stat   = aps.ap_batt_stat;
 672         aip->ai_batt_life   = aps.ap_batt_life;
 673         aip->ai_batt_time   = aps.ap_batt_time;
 674         aip->ai_major       = (u_int)sc->majorversion;
 675         aip->ai_minor       = (u_int)sc->minorversion;
 676         aip->ai_status      = (u_int)sc->active;
 677
 678         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES;
 679         sc->bios.r.ebx = 0;
 680         sc->bios.r.ecx = 0;
 681         sc->bios.r.edx = 0;
 682         if (apm_bioscall()) {
 683                 aip->ai_batteries = 0xffffffff; /* Unknown */
 684                 aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */
 685         } else {
 686                 aip->ai_batteries = sc->bios.r.ebx & 0xff;
 687                 aip->ai_capabilities = sc->bios.r.ecx & 0xff;
 688         }
 689
 690         bzero(aip->ai_spare, sizeof aip->ai_spare);
 691
 692         return 0;
 693 }
 694
 695
 696 /* inform APM BIOS that CPU is idle */
 697 void
 698 apm_cpu_idle(void)
 699 {
 700         struct apm_softc *sc = &apm_softc;
 701
 702         if (sc->active) {
 703
 704                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE;
 705                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
 706                 (void) apm_bioscall();
 707         }
 708         /*
 709          * Some APM implementation halts CPU in BIOS, whenever
 710          * "CPU-idle" function are invoked, but swtch() of
 711          * FreeBSD halts CPU, therefore, CPU is halted twice
 712          * in the sched loop. It makes the interrupt latency
 713          * terribly long and be able to cause a serious problem
 714          * in interrupt processing. We prevent it by removing
 715          * "hlt" operation from swtch() and managed it under
 716          * APM driver.
 717          */
 718         if (!sc->active || sc->always_halt_cpu)
 719                 halt(); /* wait for interrupt */
 720 }
 721
 722 /* inform APM BIOS that CPU is busy */
 723 void
 724 apm_cpu_busy(void)
 725 {
 726         struct apm_softc *sc = &apm_softc;
 727
 728         /*
 729          * The APM specification says this is only necessary if your BIOS
 730          * slows down the processor in the idle task, otherwise it's not
 731          * necessary.
 732          */
 733         if (sc->slow_idle_cpu && sc->active) {
 734
 735                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY;
 736                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
 737                 apm_bioscall();
 738         }
 739 }
 740
 741
 742 /*
 743  * APM thread loop.
 744  *
 745  * This routine wakes up from time to time to deal with delaying the
 746  * suspend of the system, or other events.
 747  */
 748 static void
 749 apm_event_thread(void *arg)
 750 {
 751         struct apm_softc *sc = &apm_softc;
 752
 753         sc->running = 1;
 754         while (sc->active) {
 755                 if (apm_op_inprog)
 756                         apm_lastreq_notify();
 757                 if (sc->standbys && sc->standby_countdown-- <= 0)
 758                         apm_do_standby();
 759                 if (sc->suspends && sc->suspend_countdown-- <= 0)
 760                         apm_do_suspend();
 761                 if (!sc->bios_busy)
 762                         apm_processevent();
 763                 mtx_lock(&sc->mtx);
 764                 cv_timedwait(&sc->cv, &sc->mtx, 10 * hz / 9);
 765                 mtx_unlock(&sc->mtx);
 766         }
 767         sc->running = 0;
 768         kproc_exit(0);
 769 }
 770
 771 /* enable APM BIOS */
 772 static void
 773 apm_event_enable(void)
 774 {
 775         struct apm_softc *sc = &apm_softc;
 776
 777         APM_DPRINT("called apm_event_enable()\n");
 778
 779         if (sc == NULL || sc->initialized == 0)
 780                 return;
 781
 782         /* Start the thread */
 783         sc->active = 1;
 784         if (kproc_create(apm_event_thread, sc, &sc->event_thread, 0, 0,
 785             "apm worker"))
 786                 panic("Cannot create apm worker thread");
 787
 788         return;
 789 }
 790
 791 /* disable APM BIOS */
 792 static void
 793 apm_event_disable(void)
 794 {
 795         struct apm_softc *sc = &apm_softc;
 796
 797         APM_DPRINT("called apm_event_disable()\n");
 798
 799         if (sc == NULL || sc->initialized == 0)
 800                 return;
 801
 802         mtx_lock(&sc->mtx);
 803         sc->active = 0;
 804         while (sc->running) {
 805                 cv_broadcast(&sc->cv);
 806                 msleep(sc->event_thread, &sc->mtx, PWAIT, "apmdie", 0);
 807         }
 808         mtx_unlock(&sc->mtx);
 809         sc->event_thread = NULL;
 810         return;
 811 }
 812
 813 /* halt CPU in scheduling loop */
 814 static void
 815 apm_halt_cpu(void)
 816 {
 817         struct apm_softc *sc = &apm_softc;
 818
 819         if (sc == NULL || sc->initialized == 0)
 820                 return;
 821
 822         sc->always_halt_cpu = 1;
 823
 824         return;
 825 }
 826
 827 /* don't halt CPU in scheduling loop */
 828 static void
 829 apm_not_halt_cpu(void)
 830 {
 831         struct apm_softc *sc = &apm_softc;
 832
 833         if (sc == NULL || sc->initialized == 0)
 834                 return;
 835
 836         sc->always_halt_cpu = 0;
 837
 838         return;
 839 }
 840
 841 /* device driver definitions */
 842
 843 /*
 844  * Module event
 845  */
 846
 847 static int
 848 apm_modevent(struct module *mod, int event, void *junk)
 849 {
 850
 851         switch (event) {
 852         case MOD_LOAD:
 853                 if (!cold)
 854                         return (EPERM);
 855                 break;
 856         case MOD_UNLOAD:
 857                 if (!cold && power_pm_get_type() == POWER_PM_TYPE_APM)
 858                         return (EBUSY);
 859                 break;
 860         default:
 861                 break;
 862         }
 863
 864         return (0);
 865 }
 866
 867 /*
 868  * Create "connection point"
 869  */
 870 static void
 871 apm_identify(driver_t *driver, device_t parent)
 872 {
 873         device_t child;
 874
 875         if (!cold) {
 876                 printf("Don't load this driver from userland!!\n");
 877                 return;
 878         }
 879
 880         if (resource_disabled("apm", 0))
 881                 return;
 882
 883         child = BUS_ADD_CHILD(parent, 0, "apm", 0);
 884         if (child == NULL)
 885                 panic("apm_identify");
 886 }
 887
 888 /*
 889  * probe for APM BIOS
 890  */
 891 static int
 892 apm_probe(device_t dev)
 893 {
 894 #define APM_KERNBASE    KERNBASE
 895         struct vm86frame        vmf;
 896         struct apm_softc        *sc = &apm_softc;
 897 #ifdef PC98
 898         int                     rid;
 899 #endif
 900
 901         device_set_desc(dev, "APM BIOS");
 902         if (device_get_unit(dev) > 0) {
 903                 printf("apm: Only one APM driver supported.\n");
 904                 return ENXIO;
 905         }
 906
 907         if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
 908             power_pm_get_type() != POWER_PM_TYPE_APM) {
 909                 printf("apm: Other PM system enabled.\n");
 910                 return ENXIO;
 911         }
 912
 913         bzero(&vmf, sizeof(struct vm86frame));          /* safety */
 914         bzero(&apm_softc, sizeof(apm_softc));
 915         vmf.vmf_ah = APM_BIOS;
 916         vmf.vmf_al = APM_INSTCHECK;
 917         vmf.vmf_bx = 0;
 918         if (vm86_intcall(APM_INT, &vmf))
 919                 return ENXIO;                   /* APM not found */
 920         if (vmf.vmf_bx != 0x504d) {
 921                 printf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx);
 922                 return ENXIO;
 923         }
 924         if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) {
 925                 printf("apm: protected mode connections are not supported\n");
 926                 return ENXIO;
 927         }
 928
 929         apm_version = vmf.vmf_ax;
 930         sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0);
 931         sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0);
 932         sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0);
 933
 934         vmf.vmf_ah = APM_BIOS;
 935         vmf.vmf_al = APM_DISCONNECT;
 936         vmf.vmf_bx = 0;
 937         vm86_intcall(APM_INT, &vmf);            /* disconnect, just in case */
 938
 939 #ifdef PC98
 940         /* PC98 have bogos APM 32bit BIOS */
 941         if ((vmf.vmf_cx & APM_32BIT_SUPPORT) == 0)
 942                 return ENXIO;
 943         rid = 0;
 944         bus_set_resource(dev, SYS_RES_IOPORT, rid,
 945                          APM_NECSMM_PORT, APM_NECSMM_PORTSZ);
 946         sc->sc_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
 947                          APM_NECSMM_PORT, ~0, APM_NECSMM_PORTSZ, RF_ACTIVE);
 948         if (sc->sc_res == NULL) {
 949                 printf("apm: cannot open NEC smm device\n");
 950                 return ENXIO;
 951         }
 952         bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->sc_res);
 953
 954         vmf.vmf_ah = APM_BIOS;
 955         vmf.vmf_al = APM_PROT32CONNECT;
 956         vmf.vmf_bx = 0;
 957         if (vm86_intcall(APM_INT, &vmf)) {
 958                 printf("apm: 32-bit connection error.\n");
 959                 return (ENXIO);
 960         }
 961
 962         sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 963         sc->bios.seg.code32.limit = 0xffff;
 964         sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 965         sc->bios.seg.code16.limit = 0xffff;
 966         sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
 967         sc->bios.seg.data.limit = 0xffff;
 968         sc->bios.entry = vmf.vmf_ebx;
 969         sc->connectmode = APM_PROT32CONNECT;
 970 #else
 971         if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) {
 972                 vmf.vmf_ah = APM_BIOS;
 973                 vmf.vmf_al = APM_PROT32CONNECT;
 974                 vmf.vmf_bx = 0;
 975                 if (vm86_intcall(APM_INT, &vmf)) {
 976                         printf("apm: 32-bit connection error.\n");
 977                         return (ENXIO);
 978                 }
 979                 sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 980                 sc->bios.seg.code32.limit = 0xffff;
 981                 sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 982                 sc->bios.seg.code16.limit = 0xffff;
 983                 sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
 984                 sc->bios.seg.data.limit = 0xffff;
 985                 sc->bios.entry = vmf.vmf_ebx;
 986                 sc->connectmode = APM_PROT32CONNECT;
 987         } else {
 988                 /* use 16-bit connection */
 989                 vmf.vmf_ah = APM_BIOS;
 990                 vmf.vmf_al = APM_PROT16CONNECT;
 991                 vmf.vmf_bx = 0;
 992                 if (vm86_intcall(APM_INT, &vmf)) {
 993                         printf("apm: 16-bit connection error.\n");
 994                         return (ENXIO);
 995                 }
 996                 sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 997                 sc->bios.seg.code16.limit = 0xffff;
 998                 sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 999                 sc->bios.seg.data.limit = 0xffff;
1000                 sc->bios.entry = vmf.vmf_bx;
1001                 sc->connectmode = APM_PROT16CONNECT;
1002         }
1003 #endif
1004         return(0);
1005 }
1006
1007
1008 /*
1009  * return 0 if the user will notice and handle the event,
1010  * return 1 if the kernel driver should do so.
1011  */
1012 static int
1013 apm_record_event(struct apm_softc *sc, u_int event_type)
1014 {
1015         struct apm_event_info *evp;
1016
1017         if ((sc->sc_flags & SCFLAG_OPEN) == 0)
1018                 return 1;               /* no user waiting */
1019         if (sc->event_count == APM_NEVENTS)
1020                 return 1;                       /* overflow */
1021         if (sc->event_filter[event_type] == 0)
1022                 return 1;               /* not registered */
1023         evp = &sc->event_list[sc->event_ptr];
1024         sc->event_count++;
1025         sc->event_ptr++;
1026         sc->event_ptr %= APM_NEVENTS;
1027         evp->type = event_type;
1028         evp->index = ++apm_evindex;
1029         selwakeuppri(&sc->sc_rsel, PZERO);
1030         return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */
1031 }
1032
1033 /* Power profile */
1034 static void
1035 apm_power_profile(struct apm_softc *sc)
1036 {
1037         int state;
1038         struct apm_info info;
1039         static int apm_acline = 0;
1040
1041         if (apm_get_info(&info))
1042                 return;
1043
1044         if (apm_acline != info.ai_acline) {
1045                 apm_acline = info.ai_acline;
1046                 state = apm_acline ? POWER_PROFILE_PERFORMANCE : POWER_PROFILE_ECONOMY;
1047                 power_profile_set_state(state);
1048         }
1049 }
1050
1051 /* Process APM event */
1052 static void
1053 apm_processevent(void)
1054 {
1055         int apm_event;
1056         struct apm_softc *sc = &apm_softc;
1057
1058 #define OPMEV_DEBUGMESSAGE(symbol) case symbol:                         \
1059         APM_DPRINT("Received APM Event: " #symbol "\n");
1060
1061         do {
1062                 apm_event = apm_getevent();
1063                 switch (apm_event) {
1064                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
1065                         if (apm_op_inprog == 0) {
1066                             apm_op_inprog++;
1067                             if (apm_record_event(sc, apm_event)) {
1068                                 apm_suspend(PMST_STANDBY);
1069                             }
1070                         }
1071                         break;
1072                     OPMEV_DEBUGMESSAGE(PMEV_USERSTANDBYREQ);
1073                         if (apm_op_inprog == 0) {
1074                             apm_op_inprog++;
1075                             if (apm_record_event(sc, apm_event)) {
1076                                 apm_suspend(PMST_STANDBY);
1077                             }
1078                         }
1079                         break;
1080                     OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
1081                         apm_lastreq_notify();
1082                         if (apm_op_inprog == 0) {
1083                             apm_op_inprog++;
1084                             if (apm_record_event(sc, apm_event)) {
1085                                 apm_do_suspend();
1086                             }
1087                         }
1088                         return; /* XXX skip the rest */
1089                     OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
1090                         apm_lastreq_notify();
1091                         if (apm_op_inprog == 0) {
1092                             apm_op_inprog++;
1093                             if (apm_record_event(sc, apm_event)) {
1094                                 apm_do_suspend();
1095                             }
1096                         }
1097                         return; /* XXX skip the rest */
1098                     OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
1099                         apm_do_suspend();
1100                         break;
1101                     OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
1102                         apm_record_event(sc, apm_event);
1103                         apm_resume();
1104                         break;
1105                     OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
1106                         apm_record_event(sc, apm_event);
1107                         apm_resume();
1108                         break;
1109                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
1110                         apm_record_event(sc, apm_event);
1111                         break;
1112                     OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
1113                         if (apm_record_event(sc, apm_event)) {
1114                             apm_battery_low();
1115                             apm_suspend(PMST_SUSPEND);
1116                         }
1117                         break;
1118                     OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
1119                         apm_record_event(sc, apm_event);
1120                         apm_power_profile(sc);
1121                         break;
1122                     OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
1123                         apm_record_event(sc, apm_event);
1124                         inittodr(0);    /* adjust time to RTC */
1125                         break;
1126                     OPMEV_DEBUGMESSAGE(PMEV_CAPABILITIESCHANGE);
1127                         apm_record_event(sc, apm_event);
1128                         apm_power_profile(sc);
1129                         break;
1130                     case PMEV_NOEVENT:
1131                         break;
1132                     default:
1133                         printf("Unknown Original APM Event 0x%x\n", apm_event);
1134                             break;
1135                 }
1136         } while (apm_event != PMEV_NOEVENT);
1137 #ifdef PC98
1138         apm_disable_smm(sc);
1139 #endif
1140 }
1141
1142 /*
1143  * Attach APM:
1144  *
1145  * Initialize APM driver
1146  */
1147
1148 static int
1149 apm_attach(device_t dev)
1150 {
1151         struct apm_softc        *sc = &apm_softc;
1152         int                     drv_version;
1153 #ifdef PC98
1154         int                     rid;
1155 #endif
1156         mtx_init(&sc->mtx, device_get_nameunit(dev), "apm", MTX_DEF);
1157         cv_init(&sc->cv, "cbb cv");
1158
1159 #ifndef PC98
1160         if (device_get_flags(dev) & 0x20)
1161                 atrtcclock_disable = 1;
1162 #endif
1163
1164         sc->initialized = 0;
1165
1166         /* Must be externally enabled */
1167         sc->active = 0;
1168
1169         /* Always call HLT in idle loop */
1170         sc->always_halt_cpu = 1;
1171
1172         getenv_int("debug.apm_debug", &apm_debug);
1173
1174         /* print bootstrap messages */
1175         APM_DPRINT("apm: APM BIOS version %04lx\n",  apm_version);
1176         APM_DPRINT("apm: Code16 0x%08x, Data 0x%08x\n",
1177             sc->bios.seg.code16.base, sc->bios.seg.data.base);
1178         APM_DPRINT("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
1179             sc->bios.entry, is_enabled(sc->slow_idle_cpu),
1180             is_enabled(!sc->disabled));
1181         APM_DPRINT("apm: CS_limit=0x%x, DS_limit=0x%x\n",
1182             sc->bios.seg.code16.limit, sc->bios.seg.data.limit);
1183
1184 #ifdef PC98
1185         rid = 0;
1186         sc->sc_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
1187                          APM_NECSMM_PORT, ~0, APM_NECSMM_PORTSZ, RF_ACTIVE);
1188         if (sc->sc_res == NULL)
1189                 panic("%s: counldn't map I/O ports", device_get_name(dev));
1190         sc->sc_iot = rman_get_bustag(sc->sc_res);
1191         sc->sc_ioh = rman_get_bushandle(sc->sc_res);
1192
1193         if (apm_version==0x112 || apm_version==0x111 || apm_version==0x110)
1194                 apm_necsmm_addr = APM_NECSMM_PORT;
1195         else
1196                 apm_necsmm_addr = 0;
1197         apm_necsmm_mask = ~APM_NECSMM_EN;
1198 #endif /* PC98 */
1199
1200         /*
1201          * In one test, apm bios version was 1.02; an attempt to register
1202          * a 1.04 driver resulted in a 1.00 connection!  Registering a
1203          * 1.02 driver resulted in a 1.02 connection.
1204          */
1205         drv_version = apm_version > 0x102 ? 0x102 : apm_version;
1206         for (; drv_version > 0x100; drv_version--)
1207                 if (apm_driver_version(drv_version) == 0)
1208                         break;
1209         sc->minorversion = ((drv_version & 0x00f0) >>  4) * 10 +
1210                 ((drv_version & 0x000f) >> 0);
1211         sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 +
1212                 ((apm_version & 0x0f00) >> 8);
1213
1214         sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
1215
1216         if (sc->intversion >= INTVERSION(1, 1))
1217                 APM_DPRINT("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
1218         device_printf(dev, "found APM BIOS v%ld.%ld, connected at v%d.%d\n",
1219                ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8),
1220                ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0),
1221                sc->majorversion, sc->minorversion);
1222
1223
1224         APM_DPRINT("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
1225         /* enable power management */
1226         if (sc->disabled) {
1227                 if (apm_enable_disable_pm(1)) {
1228                         APM_DPRINT("apm: *Warning* enable function failed! [%x]\n",
1229                             (sc->bios.r.eax >> 8) & 0xff);
1230                 }
1231         }
1232
1233         /* engage power managment (APM 1.1 or later) */
1234         if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
1235                 if (apm_engage_disengage_pm(1)) {
1236                         APM_DPRINT("apm: *Warning* engage function failed err=[%x]",
1237                             (sc->bios.r.eax >> 8) & 0xff);
1238                         APM_DPRINT(" (Docked or using external power?).\n");
1239                 }
1240         }
1241
1242         /* Power the system off using APM */
1243         EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL,
1244                               SHUTDOWN_PRI_LAST);
1245
1246         /* Register APM again to pass the correct argument of pm_func. */
1247         power_pm_register(POWER_PM_TYPE_APM, apm_pm_func, sc);
1248
1249         sc->initialized = 1;
1250         sc->suspending = 0;
1251         sc->running = 0;
1252
1253         make_dev(&apm_cdevsw, APMDEV_NORMAL,
1254             UID_ROOT, GID_OPERATOR, 0664, "apm");
1255         make_dev(&apm_cdevsw, APMDEV_CTL,
1256             UID_ROOT, GID_OPERATOR, 0660, "apmctl");
1257         return 0;
1258 }
1259
1260 static int
1261 apmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
1262 {
1263         struct apm_softc *sc = &apm_softc;
1264
1265         if (sc == NULL || sc->initialized == 0)
1266                 return (ENXIO);
1267
1268         switch (dev2unit(dev)) {
1269         case APMDEV_CTL:
1270                 if (!(flag & FWRITE))
1271                         return EINVAL;
1272                 if (sc->sc_flags & SCFLAG_OCTL)
1273                         return EBUSY;
1274                 sc->sc_flags |= SCFLAG_OCTL;
1275                 bzero(sc->event_filter, sizeof sc->event_filter);
1276                 break;
1277         case APMDEV_NORMAL:
1278                 sc->sc_flags |= SCFLAG_ONORMAL;
1279                 break;
1280         }
1281         return 0;
1282 }
1283
1284 static int
1285 apmclose(struct cdev *dev, int flag, int fmt, struct thread *td)
1286 {
1287         struct apm_softc *sc = &apm_softc;
1288
1289         switch (dev2unit(dev)) {
1290         case APMDEV_CTL:
1291                 apm_lastreq_rejected();
1292                 sc->sc_flags &= ~SCFLAG_OCTL;
1293                 bzero(sc->event_filter, sizeof sc->event_filter);
1294                 break;
1295         case APMDEV_NORMAL:
1296                 sc->sc_flags &= ~SCFLAG_ONORMAL;
1297                 break;
1298         }
1299         if ((sc->sc_flags & SCFLAG_OPEN) == 0) {
1300                 sc->event_count = 0;
1301                 sc->event_ptr = 0;
1302         }
1303         return 0;
1304 }
1305
1306 static int
1307 apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
1308 {
1309         struct apm_softc *sc = &apm_softc;
1310         struct apm_bios_arg *args;
1311         int error = 0;
1312         int ret;
1313         int newstate;
1314
1315         if (sc == NULL || sc->initialized == 0)
1316                 return (ENXIO);
1317
1318         APM_DPRINT("APM ioctl: cmd = 0x%lx\n", cmd);
1319         switch (cmd) {
1320         case APMIO_SUSPEND:
1321                 if (!(flag & FWRITE))
1322                         return (EPERM);
1323                 if (sc->active)
1324                         apm_suspend(PMST_SUSPEND);
1325                 else
1326                         error = EINVAL;
1327                 break;
1328
1329         case APMIO_STANDBY:
1330                 if (!(flag & FWRITE))
1331                         return (EPERM);
1332                 if (sc->active)
1333                         apm_suspend(PMST_STANDBY);
1334                 else
1335                         error = EINVAL;
1336                 break;
1337
1338         case APMIO_GETINFO_OLD:
1339                 {
1340                         struct apm_info info;
1341                         apm_info_old_t aiop;
1342
1343                         if (apm_get_info(&info))
1344                                 error = ENXIO;
1345                         aiop = (apm_info_old_t)addr;
1346                         aiop->ai_major = info.ai_major;
1347                         aiop->ai_minor = info.ai_minor;
1348                         aiop->ai_acline = info.ai_acline;
1349                         aiop->ai_batt_stat = info.ai_batt_stat;
1350                         aiop->ai_batt_life = info.ai_batt_life;
1351                         aiop->ai_status = info.ai_status;
1352                 }
1353                 break;
1354         case APMIO_GETINFO:
1355                 if (apm_get_info((apm_info_t)addr))
1356                         error = ENXIO;
1357                 break;
1358         case APMIO_GETPWSTATUS:
1359                 if (apm_get_pwstatus((apm_pwstatus_t)addr))
1360                         error = ENXIO;
1361                 break;
1362         case APMIO_ENABLE:
1363                 if (!(flag & FWRITE))
1364                         return (EPERM);
1365                 apm_event_enable();
1366                 break;
1367         case APMIO_DISABLE:
1368                 if (!(flag & FWRITE))
1369                         return (EPERM);
1370                 apm_event_disable();
1371                 break;
1372         case APMIO_HALTCPU:
1373                 if (!(flag & FWRITE))
1374                         return (EPERM);
1375                 apm_halt_cpu();
1376                 break;
1377         case APMIO_NOTHALTCPU:
1378                 if (!(flag & FWRITE))
1379                         return (EPERM);
1380                 apm_not_halt_cpu();
1381                 break;
1382         case APMIO_DISPLAY:
1383                 if (!(flag & FWRITE))
1384                         return (EPERM);
1385                 newstate = *(int *)addr;
1386                 if (apm_display(newstate))
1387                         error = ENXIO;
1388                 break;
1389         case APMIO_BIOS:
1390                 if (!(flag & FWRITE))
1391                         return (EPERM);
1392                 /* XXX compatibility with the old interface */
1393                 args = (struct apm_bios_arg *)addr;
1394 #ifdef PC98
1395                 if (((args->eax >> 8) & 0xff) == 0x53) {
1396                         sc->bios.r.eax = args->eax & ~0xffff;
1397                         sc->bios.r.eax |= APM_BIOS << 8;
1398                         switch (args->eax & 0xff) {
1399                         case 0x0a:
1400                                 sc->bios.r.eax |= APM_GETPWSTATUS;
1401                                 break;
1402                         case 0x0e:
1403                                 sc->bios.r.eax |= APM_DRVVERSION;
1404                                 break;
1405                         default:
1406                                 sc->bios.r.eax |= args->eax & 0xff;
1407                                 break;
1408                         }
1409                 } else
1410 #endif
1411                 sc->bios.r.eax = args->eax;
1412                 sc->bios.r.ebx = args->ebx;
1413                 sc->bios.r.ecx = args->ecx;
1414                 sc->bios.r.edx = args->edx;
1415                 sc->bios.r.esi = args->esi;
1416                 sc->bios.r.edi = args->edi;
1417                 if ((ret = apm_bioscall())) {
1418                         /*
1419                          * Return code 1 means bios call was unsuccessful.
1420                          * Error code is stored in %ah.
1421                          * Return code -1 means bios call was unsupported
1422                          * in the APM BIOS version.
1423                          */
1424                         if (ret == -1) {
1425                                 error = EINVAL;
1426                         }
1427                 } else {
1428                         /*
1429                          * Return code 0 means bios call was successful.
1430                          * We need only %al and can discard %ah.
1431                          */
1432                         sc->bios.r.eax &= 0xff;
1433                 }
1434                 args->eax = sc->bios.r.eax;
1435                 args->ebx = sc->bios.r.ebx;
1436                 args->ecx = sc->bios.r.ecx;
1437                 args->edx = sc->bios.r.edx;
1438                 args->esi = sc->bios.r.esi;
1439                 args->edi = sc->bios.r.edi;
1440                 break;
1441         default:
1442                 error = EINVAL;
1443                 break;
1444         }
1445
1446         /* for /dev/apmctl */
1447         if (dev2unit(dev) == APMDEV_CTL) {
1448                 struct apm_event_info *evp;
1449                 int i;
1450
1451                 error = 0;
1452                 switch (cmd) {
1453                 case APMIO_NEXTEVENT:
1454                         if (!sc->event_count) {
1455                                 error = EAGAIN;
1456                         } else {
1457                                 evp = (struct apm_event_info *)addr;
1458                                 i = sc->event_ptr + APM_NEVENTS - sc->event_count;
1459                                 i %= APM_NEVENTS;
1460                                 *evp = sc->event_list[i];
1461                                 sc->event_count--;
1462                         }
1463                         break;
1464                 case APMIO_REJECTLASTREQ:
1465                         if (apm_lastreq_rejected()) {
1466                                 error = EINVAL;
1467                         }
1468                         break;
1469                 default:
1470                         error = EINVAL;
1471                         break;
1472                 }
1473         }
1474
1475         return error;
1476 }
1477
1478 static int
1479 apmwrite(struct cdev *dev, struct uio *uio, int ioflag)
1480 {
1481         struct apm_softc *sc = &apm_softc;
1482         u_int event_type;
1483         int error;
1484         u_char enabled;
1485
1486         if (dev2unit(dev) != APMDEV_CTL)
1487                 return(ENODEV);
1488         if (uio->uio_resid != sizeof(u_int))
1489                 return(E2BIG);
1490
1491         if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio)))
1492                 return(error);
1493
1494         if (event_type < 0 || event_type >= APM_NPMEV)
1495                 return(EINVAL);
1496
1497         if (sc->event_filter[event_type] == 0) {
1498                 enabled = 1;
1499         } else {
1500                 enabled = 0;
1501         }
1502         sc->event_filter[event_type] = enabled;
1503         APM_DPRINT("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled));
1504
1505         return uio->uio_resid;
1506 }
1507
1508 static int
1509 apmpoll(struct cdev *dev, int events, struct thread *td)
1510 {
1511         struct apm_softc *sc = &apm_softc;
1512         int revents = 0;
1513
1514         if (events & (POLLIN | POLLRDNORM)) {
1515                 if (sc->event_count) {
1516                         revents |= events & (POLLIN | POLLRDNORM);
1517                 } else {
1518                         selrecord(td, &sc->sc_rsel);
1519                 }
1520         }
1521
1522         return (revents);
1523 }
1524
1525 static device_method_t apm_methods[] = {
1526         /* Device interface */
1527         DEVMETHOD(device_identify,      apm_identify),
1528         DEVMETHOD(device_probe,         apm_probe),
1529         DEVMETHOD(device_attach,        apm_attach),
1530
1531         { 0, 0 }
1532 };
1533
1534 static driver_t apm_driver = {
1535         "apm",
1536         apm_methods,
1537         1,                      /* no softc (XXX) */
1538 };
1539
1540 static devclass_t apm_devclass;
1541
1542 DRIVER_MODULE(apm, legacy, apm_driver, apm_devclass, apm_modevent, 0);
1543 MODULE_VERSION(apm, 1);
1544
1545 static int
1546 apm_pm_func(u_long cmd, void *arg, ...)
1547 {
1548         int     state, apm_state;
1549         int     error;
1550         va_list ap;
1551
1552         error = 0;
1553         switch (cmd) {
1554         case POWER_CMD_SUSPEND:
1555                 va_start(ap, arg);
1556                 state = va_arg(ap, int);
1557                 va_end(ap);
1558
1559                 switch (state) {
1560                 case POWER_SLEEP_STATE_STANDBY:
1561                         apm_state = PMST_STANDBY;
1562                         break;
1563                 case POWER_SLEEP_STATE_SUSPEND:
1564                 case POWER_SLEEP_STATE_HIBERNATE:
1565                         apm_state = PMST_SUSPEND;
1566                         break;
1567                 default:
1568                         error = EINVAL;
1569                         goto out;
1570                 }
1571
1572                 apm_suspend(apm_state);
1573                 break;
1574
1575         default:
1576                 error = EINVAL;
1577                 goto out;
1578         }
1579
1580 out:
1581         return (error);
1582 }
1583
1584 static void
1585 apm_pm_register(void *arg)
1586 {
1587
1588         if (!resource_disabled("apm", 0))
1589                 power_pm_register(POWER_PM_TYPE_APM, apm_pm_func, NULL);
1590 }
1591
1592 SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, apm_pm_register, 0);