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
  63 /* Used by the apm_saver screen saver module */
  64 int apm_display(int newstate);
  65 struct apm_softc apm_softc;
  66
  67 static void apm_resume(void);
  68 static int apm_bioscall(void);
  69 static int apm_check_function_supported(u_int version, u_int func);
  70
  71 static int apm_pm_func(u_long, void*, ...);
  72
  73 static u_long   apm_version;
  74
  75 int     apm_evindex;
  76
  77 #define SCFLAG_ONORMAL  0x0000001
  78 #define SCFLAG_OCTL     0x0000002
  79 #define SCFLAG_OPEN     (SCFLAG_ONORMAL|SCFLAG_OCTL)
  80
  81 #define APMDEV(dev)     (dev2unit(dev)&0x0f)
  82 #define APMDEV_NORMAL   0
  83 #define APMDEV_CTL      8
  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 TUNABLE_INT("machdep.apm_swab_batt_minutes", &apm_swab_batt_minutes);
 138 SYSCTL_INT(_machdep, OID_AUTO, apm_swab_batt_minutes, CTLFLAG_RW,
 139            &apm_swab_batt_minutes, 0, "Byte swap battery time value.");
 140
 141 #ifdef PC98
 142 static __inline void
 143 apm_enable_smm(sc)
 144         struct apm_softc *sc;
 145 {
 146         bus_space_tag_t iot = sc->sc_iot;
 147         bus_space_handle_t ioh = sc->sc_ioh;
 148         if (apm_necsmm_addr != 0)
 149                 bus_space_write_1(iot, ioh, 0,
 150                           (bus_space_read_1(iot, ioh, 0) | ~apm_necsmm_mask));
 151 }
 152
 153 static __inline void
 154 apm_disable_smm(sc)
 155         struct apm_softc *sc;
 156 {
 157         bus_space_tag_t iot = sc->sc_iot;
 158         bus_space_handle_t ioh = sc->sc_ioh;
 159         if (apm_necsmm_addr != 0)
 160                 bus_space_write_1(iot, ioh, 0,
 161                           (bus_space_read_1(iot, ioh, 0) & apm_necsmm_mask));
 162 }
 163 #endif
 164
 165 /*
 166  * return  0 if the function successfull,
 167  * return  1 if the function unsuccessfull,
 168  * return -1 if the function unsupported.
 169  */
 170 static int
 171 apm_bioscall(void)
 172 {
 173         struct apm_softc *sc = &apm_softc;
 174         int errno = 0;
 175         u_int apm_func = sc->bios.r.eax & 0xff;
 176
 177         if (!apm_check_function_supported(sc->intversion, apm_func)) {
 178                 APM_DPRINT("apm_bioscall: function 0x%x is not supported in v%d.%d\n",
 179                     apm_func, sc->majorversion, sc->minorversion);
 180                 return (-1);
 181         }
 182
 183         sc->bios_busy = 1;
 184 #ifdef  PC98
 185         set_bios_selectors(&sc->bios.seg, BIOSCODE_FLAG | BIOSDATA_FLAG);
 186         if (bios32_apm98(&sc->bios.r, sc->bios.entry,
 187             GSEL(GBIOSCODE32_SEL, SEL_KPL)) != 0)
 188                 return 1;
 189 #else
 190         if (sc->connectmode == APM_PROT32CONNECT) {
 191                 set_bios_selectors(&sc->bios.seg,
 192                                    BIOSCODE_FLAG | BIOSDATA_FLAG);
 193                 errno = bios32(&sc->bios.r,
 194                                sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL));
 195         } else {
 196                 errno = bios16(&sc->bios, NULL);
 197         }
 198 #endif
 199         sc->bios_busy = 0;
 200         return (errno);
 201 }
 202
 203 /* check whether APM function is supported (1)  or not (0). */
 204 static int
 205 apm_check_function_supported(u_int version, u_int func)
 206 {
 207         /* except driver version */
 208         if (func == APM_DRVVERSION) {
 209                 return (1);
 210         }
 211 #ifdef PC98
 212         if (func == APM_GETPWSTATUS) {
 213                 return (1);
 214         }
 215 #endif
 216
 217         switch (version) {
 218         case INTVERSION(1, 0):
 219                 if (func > APM_GETPMEVENT) {
 220                         return (0); /* not supported */
 221                 }
 222                 break;
 223         case INTVERSION(1, 1):
 224                 if (func > APM_ENGAGEDISENGAGEPM &&
 225                     func < APM_OEMFUNC) {
 226                         return (0); /* not supported */
 227                 }
 228                 break;
 229         case INTVERSION(1, 2):
 230                 break;
 231         }
 232
 233         return (1); /* supported */
 234 }
 235
 236 /* enable/disable power management */
 237 static int
 238 apm_enable_disable_pm(int enable)
 239 {
 240         struct apm_softc *sc = &apm_softc;
 241
 242         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
 243
 244         if (sc->intversion >= INTVERSION(1, 1))
 245                 sc->bios.r.ebx  = PMDV_ALLDEV;
 246         else
 247                 sc->bios.r.ebx  = 0xffff;       /* APM version 1.0 only */
 248         sc->bios.r.ecx  = enable;
 249         sc->bios.r.edx = 0;
 250         return (apm_bioscall());
 251 }
 252
 253 /* register driver version (APM 1.1 or later) */
 254 static int
 255 apm_driver_version(int version)
 256 {
 257         struct apm_softc *sc = &apm_softc;
 258
 259         sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION;
 260         sc->bios.r.ebx  = 0x0;
 261         sc->bios.r.ecx  = version;
 262         sc->bios.r.edx = 0;
 263
 264         if (apm_bioscall() == 0 && sc->bios.r.eax == version)
 265                 return (0);
 266
 267         /* Some old BIOSes don't return the connection version in %ax. */
 268         if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION))
 269                 return (0);
 270
 271         return (1);
 272 }
 273
 274 /* engage/disengage power management (APM 1.1 or later) */
 275 static int
 276 apm_engage_disengage_pm(int engage)
 277 {
 278         struct apm_softc *sc = &apm_softc;
 279
 280         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
 281         sc->bios.r.ebx = PMDV_ALLDEV;
 282         sc->bios.r.ecx = engage;
 283         sc->bios.r.edx = 0;
 284         return (apm_bioscall());
 285 }
 286
 287 /* get PM event */
 288 static u_int
 289 apm_getevent(void)
 290 {
 291         struct apm_softc *sc = &apm_softc;
 292
 293         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT;
 294
 295         sc->bios.r.ebx = 0;
 296         sc->bios.r.ecx = 0;
 297         sc->bios.r.edx = 0;
 298         if (apm_bioscall())
 299                 return (PMEV_NOEVENT);
 300         return (sc->bios.r.ebx & 0xffff);
 301 }
 302
 303 /* suspend entire system */
 304 static int
 305 apm_suspend_system(int state)
 306 {
 307         struct apm_softc *sc = &apm_softc;
 308
 309         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 310         sc->bios.r.ebx = PMDV_ALLDEV;
 311         sc->bios.r.ecx = state;
 312         sc->bios.r.edx = 0;
 313
 314 #ifdef PC98
 315         apm_disable_smm(sc);
 316 #endif
 317         if (apm_bioscall()) {
 318                 printf("Entire system suspend failure: errcode = %d\n",
 319                        0xff & (sc->bios.r.eax >> 8));
 320                 return 1;
 321         }
 322 #ifdef PC98
 323         apm_enable_smm(sc);
 324 #endif
 325         return 0;
 326 }
 327
 328 /* Display control */
 329 /*
 330  * Experimental implementation: My laptop machine can't handle this function
 331  * If your laptop can control the display via APM, please inform me.
 332  *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
 333  */
 334 int
 335 apm_display(int newstate)
 336 {
 337         struct apm_softc *sc = &apm_softc;
 338
 339         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 340         sc->bios.r.ebx = PMDV_DISP0;
 341         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
 342         sc->bios.r.edx = 0;
 343         if (apm_bioscall() == 0) {
 344                 return 0;
 345         }
 346
 347         /* If failed, then try to blank all display devices instead. */
 348         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 349         sc->bios.r.ebx = PMDV_DISPALL;  /* all display devices */
 350         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
 351         sc->bios.r.edx = 0;
 352         if (apm_bioscall() == 0) {
 353                 return 0;
 354         }
 355         printf("Display off failure: errcode = %d\n",
 356                0xff & (sc->bios.r.eax >> 8));
 357         return 1;
 358 }
 359
 360 /*
 361  * Turn off the entire system.
 362  */
 363 static void
 364 apm_power_off(void *junk, int howto)
 365 {
 366         struct apm_softc *sc = &apm_softc;
 367
 368         /* Not halting powering off, or not active */
 369         if (!(howto & RB_POWEROFF) || !apm_softc.active)
 370                 return;
 371         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 372         sc->bios.r.ebx = PMDV_ALLDEV;
 373         sc->bios.r.ecx = PMST_OFF;
 374         sc->bios.r.edx = 0;
 375         (void) apm_bioscall();
 376 }
 377
 378 /* APM Battery low handler */
 379 static void
 380 apm_battery_low(void)
 381 {
 382         printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
 383 }
 384
 385 /* APM hook manager */
 386 static struct apmhook *
 387 apm_add_hook(struct apmhook **list, struct apmhook *ah)
 388 {
 389         int s;
 390         struct apmhook *p, *prev;
 391
 392         APM_DPRINT("Add hook \"%s\"\n", ah->ah_name);
 393
 394         s = splhigh();
 395         if (ah == NULL)
 396                 panic("illegal apm_hook!");
 397         prev = NULL;
 398         for (p = *list; p != NULL; prev = p, p = p->ah_next)
 399                 if (p->ah_order > ah->ah_order)
 400                         break;
 401
 402         if (prev == NULL) {
 403                 ah->ah_next = *list;
 404                 *list = ah;
 405         } else {
 406                 ah->ah_next = prev->ah_next;
 407                 prev->ah_next = ah;
 408         }
 409         splx(s);
 410         return ah;
 411 }
 412
 413 static void
 414 apm_del_hook(struct apmhook **list, struct apmhook *ah)
 415 {
 416         int s;
 417         struct apmhook *p, *prev;
 418
 419         s = splhigh();
 420         prev = NULL;
 421         for (p = *list; p != NULL; prev = p, p = p->ah_next)
 422                 if (p == ah)
 423                         goto deleteit;
 424         panic("Tried to delete unregistered apm_hook.");
 425         goto nosuchnode;
 426 deleteit:
 427         if (prev != NULL)
 428                 prev->ah_next = p->ah_next;
 429         else
 430                 *list = p->ah_next;
 431 nosuchnode:
 432         splx(s);
 433 }
 434
 435
 436 /* APM driver calls some functions automatically */
 437 static void
 438 apm_execute_hook(struct apmhook *list)
 439 {
 440         struct apmhook *p;
 441
 442         for (p = list; p != NULL; p = p->ah_next) {
 443                 APM_DPRINT("Execute APM hook \"%s.\"\n", p->ah_name);
 444                 if ((*(p->ah_fun))(p->ah_arg))
 445                         printf("Warning: APM hook \"%s\" failed", p->ah_name);
 446         }
 447 }
 448
 449
 450 /* establish an apm hook */
 451 struct apmhook *
 452 apm_hook_establish(int apmh, struct apmhook *ah)
 453 {
 454         if (apmh < 0 || apmh >= NAPM_HOOK)
 455                 return NULL;
 456
 457         return apm_add_hook(&hook[apmh], ah);
 458 }
 459
 460 /* disestablish an apm hook */
 461 void
 462 apm_hook_disestablish(int apmh, struct apmhook *ah)
 463 {
 464         if (apmh < 0 || apmh >= NAPM_HOOK)
 465                 return;
 466
 467         apm_del_hook(&hook[apmh], ah);
 468 }
 469
 470 static int apm_record_event(struct apm_softc *, u_int);
 471 static void apm_processevent(void);
 472
 473 static u_int apm_op_inprog = 0;
 474
 475 static void
 476 apm_do_suspend(void)
 477 {
 478         struct apm_softc *sc = &apm_softc;
 479         int error;
 480
 481         if (sc == NULL || sc->initialized == 0)
 482                 return;
 483
 484         apm_op_inprog = 0;
 485         sc->suspends = sc->suspend_countdown = 0;
 486
 487         /*
 488          * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since
 489          * non-MPSAFE drivers need this.
 490          */
 491         mtx_lock(&Giant);
 492         error = DEVICE_SUSPEND(root_bus);
 493         if (error) {
 494                 mtx_unlock(&Giant);
 495                 return;
 496         }
 497
 498         apm_execute_hook(hook[APM_HOOK_SUSPEND]);
 499         if (apm_suspend_system(PMST_SUSPEND) == 0) {
 500                 sc->suspending = 1;
 501                 apm_processevent();
 502         } else {
 503                 /* Failure, 'resume' the system again */
 504                 apm_execute_hook(hook[APM_HOOK_RESUME]);
 505                 DEVICE_RESUME(root_bus);
 506         }
 507         mtx_unlock(&Giant);
 508         return;
 509 }
 510
 511 static void
 512 apm_do_standby(void)
 513 {
 514         struct apm_softc *sc = &apm_softc;
 515
 516         if (sc == NULL || sc->initialized == 0)
 517                 return;
 518
 519         apm_op_inprog = 0;
 520         sc->standbys = sc->standby_countdown = 0;
 521
 522         /*
 523          * As far as standby, we don't need to execute
 524          * all of suspend hooks.
 525          */
 526         if (apm_suspend_system(PMST_STANDBY) == 0)
 527                 apm_processevent();
 528         return;
 529 }
 530
 531 static void
 532 apm_lastreq_notify(void)
 533 {
 534         struct apm_softc *sc = &apm_softc;
 535
 536         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 537         sc->bios.r.ebx = PMDV_ALLDEV;
 538         sc->bios.r.ecx = PMST_LASTREQNOTIFY;
 539         sc->bios.r.edx = 0;
 540         apm_bioscall();
 541 }
 542
 543 static int
 544 apm_lastreq_rejected(void)
 545 {
 546         struct apm_softc *sc = &apm_softc;
 547
 548         if (apm_op_inprog == 0) {
 549                 return 1;       /* no operation in progress */
 550         }
 551
 552         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 553         sc->bios.r.ebx = PMDV_ALLDEV;
 554         sc->bios.r.ecx = PMST_LASTREQREJECT;
 555         sc->bios.r.edx = 0;
 556
 557         if (apm_bioscall()) {
 558                 APM_DPRINT("apm_lastreq_rejected: failed\n");
 559                 return 1;
 560         }
 561         apm_op_inprog = 0;
 562         return 0;
 563 }
 564
 565 /*
 566  * Public interface to the suspend/resume:
 567  *
 568  * Execute suspend and resume hook before and after sleep, respectively.
 569  *
 570  */
 571
 572 void
 573 apm_suspend(int state)
 574 {
 575         struct apm_softc *sc = &apm_softc;
 576
 577         if (sc == NULL || sc->initialized == 0)
 578                 return;
 579
 580         switch (state) {
 581         case PMST_SUSPEND:
 582                 if (sc->suspends)
 583                         return;
 584                 sc->suspends++;
 585                 sc->suspend_countdown = apm_suspend_delay;
 586                 break;
 587         case PMST_STANDBY:
 588                 if (sc->standbys)
 589                         return;
 590                 sc->standbys++;
 591                 sc->standby_countdown = apm_standby_delay;
 592                 break;
 593         default:
 594                 printf("apm_suspend: Unknown Suspend state 0x%x\n", state);
 595                 return;
 596         }
 597
 598         apm_op_inprog++;
 599         apm_lastreq_notify();
 600 }
 601
 602 static void
 603 apm_resume(void)
 604 {
 605         struct apm_softc *sc = &apm_softc;
 606
 607         if (sc == NULL || sc->initialized == 0 || sc->suspending == 0)
 608                 return;
 609
 610         sc->suspending = 0;
 611         apm_execute_hook(hook[APM_HOOK_RESUME]);
 612         mtx_lock(&Giant);
 613         DEVICE_RESUME(root_bus);
 614         mtx_unlock(&Giant);
 615         return;
 616 }
 617
 618
 619 /* get power status per battery */
 620 static int
 621 apm_get_pwstatus(apm_pwstatus_t app)
 622 {
 623         struct apm_softc *sc = &apm_softc;
 624
 625         if (app->ap_device != PMDV_ALLDEV &&
 626             (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
 627                 return 1;
 628
 629         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
 630         sc->bios.r.ebx = app->ap_device;
 631         sc->bios.r.ecx = 0;
 632         sc->bios.r.edx = 0xffff;        /* default to unknown battery time */
 633
 634         if (apm_bioscall())
 635                 return 1;
 636
 637         app->ap_acline    = (sc->bios.r.ebx >> 8) & 0xff;
 638         app->ap_batt_stat = sc->bios.r.ebx & 0xff;
 639         app->ap_batt_flag = (sc->bios.r.ecx >> 8) & 0xff;
 640         app->ap_batt_life = sc->bios.r.ecx & 0xff;
 641         sc->bios.r.edx &= 0xffff;
 642         if (apm_swab_batt_minutes)
 643                 sc->bios.r.edx = __bswap16(sc->bios.r.edx) | 0x8000;
 644         if (sc->bios.r.edx == 0xffff)   /* Time is unknown */
 645                 app->ap_batt_time = -1;
 646         else if (sc->bios.r.edx & 0x8000)       /* Time is in minutes */
 647                 app->ap_batt_time = (sc->bios.r.edx & 0x7fff) * 60;
 648         else                            /* Time is in seconds */
 649                 app->ap_batt_time = sc->bios.r.edx;
 650
 651         return 0;
 652 }
 653
 654
 655 /* get APM information */
 656 static int
 657 apm_get_info(apm_info_t aip)
 658 {
 659         struct apm_softc *sc = &apm_softc;
 660         struct apm_pwstatus aps;
 661
 662         bzero(&aps, sizeof(aps));
 663         aps.ap_device = PMDV_ALLDEV;
 664         if (apm_get_pwstatus(&aps))
 665                 return 1;
 666
 667         aip->ai_infoversion = 1;
 668         aip->ai_acline      = aps.ap_acline;
 669         aip->ai_batt_stat   = aps.ap_batt_stat;
 670         aip->ai_batt_life   = aps.ap_batt_life;
 671         aip->ai_batt_time   = aps.ap_batt_time;
 672         aip->ai_major       = (u_int)sc->majorversion;
 673         aip->ai_minor       = (u_int)sc->minorversion;
 674         aip->ai_status      = (u_int)sc->active;
 675
 676         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES;
 677         sc->bios.r.ebx = 0;
 678         sc->bios.r.ecx = 0;
 679         sc->bios.r.edx = 0;
 680         if (apm_bioscall()) {
 681                 aip->ai_batteries = 0xffffffff; /* Unknown */
 682                 aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */
 683         } else {
 684                 aip->ai_batteries = sc->bios.r.ebx & 0xff;
 685                 aip->ai_capabilities = sc->bios.r.ecx & 0xff;
 686         }
 687
 688         bzero(aip->ai_spare, sizeof aip->ai_spare);
 689
 690         return 0;
 691 }
 692
 693
 694 /* inform APM BIOS that CPU is idle */
 695 void
 696 apm_cpu_idle(void)
 697 {
 698         struct apm_softc *sc = &apm_softc;
 699
 700         if (sc->active) {
 701
 702                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE;
 703                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
 704                 (void) apm_bioscall();
 705         }
 706         /*
 707          * Some APM implementation halts CPU in BIOS, whenever
 708          * "CPU-idle" function are invoked, but swtch() of
 709          * FreeBSD halts CPU, therefore, CPU is halted twice
 710          * in the sched loop. It makes the interrupt latency
 711          * terribly long and be able to cause a serious problem
 712          * in interrupt processing. We prevent it by removing
 713          * "hlt" operation from swtch() and managed it under
 714          * APM driver.
 715          */
 716         if (!sc->active || sc->always_halt_cpu)
 717                 halt(); /* wait for interrupt */
 718 }
 719
 720 /* inform APM BIOS that CPU is busy */
 721 void
 722 apm_cpu_busy(void)
 723 {
 724         struct apm_softc *sc = &apm_softc;
 725
 726         /*
 727          * The APM specification says this is only necessary if your BIOS
 728          * slows down the processor in the idle task, otherwise it's not
 729          * necessary.
 730          */
 731         if (sc->slow_idle_cpu && sc->active) {
 732
 733                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY;
 734                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
 735                 apm_bioscall();
 736         }
 737 }
 738
 739
 740 /*
 741  * APM thread loop.
 742  *
 743  * This routine wakes up from time to time to deal with delaying the
 744  * suspend of the system, or other events.
 745  */
 746 static void
 747 apm_event_thread(void *arg)
 748 {
 749         struct apm_softc *sc = &apm_softc;
 750
 751         sc->running = 1;
 752         while (sc->active) {
 753                 if (apm_op_inprog)
 754                         apm_lastreq_notify();
 755                 if (sc->standbys && sc->standby_countdown-- <= 0)
 756                         apm_do_standby();
 757                 if (sc->suspends && sc->suspend_countdown-- <= 0)
 758                         apm_do_suspend();
 759                 if (!sc->bios_busy)
 760                         apm_processevent();
 761                 mtx_lock(&sc->mtx);
 762                 cv_timedwait(&sc->cv, &sc->mtx, 10 * hz / 9);
 763                 mtx_unlock(&sc->mtx);
 764         }
 765         sc->running = 0;
 766         kproc_exit(0);
 767 }
 768
 769 /* enable APM BIOS */
 770 static void
 771 apm_event_enable(void)
 772 {
 773         struct apm_softc *sc = &apm_softc;
 774
 775         APM_DPRINT("called apm_event_enable()\n");
 776
 777         if (sc == NULL || sc->initialized == 0)
 778                 return;
 779
 780         /* Start the thread */
 781         sc->active = 1;
 782         if (kproc_create(apm_event_thread, sc, &sc->event_thread, 0, 0,
 783             "apm worker"))
 784                 panic("Cannot create apm worker thread");
 785
 786         return;
 787 }
 788
 789 /* disable APM BIOS */
 790 static void
 791 apm_event_disable(void)
 792 {
 793         struct apm_softc *sc = &apm_softc;
 794
 795         APM_DPRINT("called apm_event_disable()\n");
 796
 797         if (sc == NULL || sc->initialized == 0)
 798                 return;
 799
 800         mtx_lock(&sc->mtx);
 801         sc->active = 0;
 802         while (sc->running) {
 803                 cv_broadcast(&sc->cv);
 804                 msleep(sc->event_thread, &sc->mtx, PWAIT, "apmdie", 0);
 805         }
 806         mtx_unlock(&sc->mtx);
 807         sc->event_thread = NULL;
 808         return;
 809 }
 810
 811 /* halt CPU in scheduling loop */
 812 static void
 813 apm_halt_cpu(void)
 814 {
 815         struct apm_softc *sc = &apm_softc;
 816
 817         if (sc == NULL || sc->initialized == 0)
 818                 return;
 819
 820         sc->always_halt_cpu = 1;
 821
 822         return;
 823 }
 824
 825 /* don't halt CPU in scheduling loop */
 826 static void
 827 apm_not_halt_cpu(void)
 828 {
 829         struct apm_softc *sc = &apm_softc;
 830
 831         if (sc == NULL || sc->initialized == 0)
 832                 return;
 833
 834         sc->always_halt_cpu = 0;
 835
 836         return;
 837 }
 838
 839 /* device driver definitions */
 840
 841 /*
 842  * Module event
 843  */
 844
 845 static int
 846 apm_modevent(struct module *mod, int event, void *junk)
 847 {
 848
 849         switch (event) {
 850         case MOD_LOAD:
 851                 if (!cold)
 852                         return (EPERM);
 853                 break;
 854         case MOD_UNLOAD:
 855                 if (!cold && power_pm_get_type() == POWER_PM_TYPE_APM)
 856                         return (EBUSY);
 857                 break;
 858         default:
 859                 break;
 860         }
 861
 862         return (0);
 863 }
 864
 865 /*
 866  * Create "connection point"
 867  */
 868 static void
 869 apm_identify(driver_t *driver, device_t parent)
 870 {
 871         device_t child;
 872
 873         if (!cold) {
 874                 printf("Don't load this driver from userland!!\n");
 875                 return;
 876         }
 877
 878         if (resource_disabled("apm", 0))
 879                 return;
 880
 881         child = BUS_ADD_CHILD(parent, 0, "apm", 0);
 882         if (child == NULL)
 883                 panic("apm_identify");
 884 }
 885
 886 /*
 887  * probe for APM BIOS
 888  */
 889 static int
 890 apm_probe(device_t dev)
 891 {
 892 #define APM_KERNBASE    KERNBASE
 893         struct vm86frame        vmf;
 894         struct apm_softc        *sc = &apm_softc;
 895 #ifdef PC98
 896         int                     rid;
 897 #endif
 898
 899         device_set_desc(dev, "APM BIOS");
 900         if (device_get_unit(dev) > 0) {
 901                 printf("apm: Only one APM driver supported.\n");
 902                 return ENXIO;
 903         }
 904
 905         if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
 906             power_pm_get_type() != POWER_PM_TYPE_APM) {
 907                 printf("apm: Other PM system enabled.\n");
 908                 return ENXIO;
 909         }
 910
 911         bzero(&vmf, sizeof(struct vm86frame));          /* safety */
 912         bzero(&apm_softc, sizeof(apm_softc));
 913         vmf.vmf_ah = APM_BIOS;
 914         vmf.vmf_al = APM_INSTCHECK;
 915         vmf.vmf_bx = 0;
 916         if (vm86_intcall(APM_INT, &vmf))
 917                 return ENXIO;                   /* APM not found */
 918         if (vmf.vmf_bx != 0x504d) {
 919                 printf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx);
 920                 return ENXIO;
 921         }
 922         if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) {
 923                 printf("apm: protected mode connections are not supported\n");
 924                 return ENXIO;
 925         }
 926
 927         apm_version = vmf.vmf_ax;
 928         sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0);
 929         sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0);
 930         sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0);
 931
 932         vmf.vmf_ah = APM_BIOS;
 933         vmf.vmf_al = APM_DISCONNECT;
 934         vmf.vmf_bx = 0;
 935         vm86_intcall(APM_INT, &vmf);            /* disconnect, just in case */
 936
 937 #ifdef PC98
 938         /* PC98 have bogos APM 32bit BIOS */
 939         if ((vmf.vmf_cx & APM_32BIT_SUPPORT) == 0)
 940                 return ENXIO;
 941         rid = 0;
 942         bus_set_resource(dev, SYS_RES_IOPORT, rid,
 943                          APM_NECSMM_PORT, APM_NECSMM_PORTSZ);
 944         sc->sc_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
 945                          APM_NECSMM_PORT, ~0, APM_NECSMM_PORTSZ, RF_ACTIVE);
 946         if (sc->sc_res == NULL) {
 947                 printf("apm: cannot open NEC smm device\n");
 948                 return ENXIO;
 949         }
 950         bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->sc_res);
 951
 952         vmf.vmf_ah = APM_BIOS;
 953         vmf.vmf_al = APM_PROT32CONNECT;
 954         vmf.vmf_bx = 0;
 955         if (vm86_intcall(APM_INT, &vmf)) {
 956                 printf("apm: 32-bit connection error.\n");
 957                 return (ENXIO);
 958         }
 959
 960         sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 961         sc->bios.seg.code32.limit = 0xffff;
 962         sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 963         sc->bios.seg.code16.limit = 0xffff;
 964         sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
 965         sc->bios.seg.data.limit = 0xffff;
 966         sc->bios.entry = vmf.vmf_ebx;
 967         sc->connectmode = APM_PROT32CONNECT;
 968 #else
 969         if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) {
 970                 vmf.vmf_ah = APM_BIOS;
 971                 vmf.vmf_al = APM_PROT32CONNECT;
 972                 vmf.vmf_bx = 0;
 973                 if (vm86_intcall(APM_INT, &vmf)) {
 974                         printf("apm: 32-bit connection error.\n");
 975                         return (ENXIO);
 976                 }
 977                 sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 978                 sc->bios.seg.code32.limit = 0xffff;
 979                 sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 980                 sc->bios.seg.code16.limit = 0xffff;
 981                 sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
 982                 sc->bios.seg.data.limit = 0xffff;
 983                 sc->bios.entry = vmf.vmf_ebx;
 984                 sc->connectmode = APM_PROT32CONNECT;
 985         } else {
 986                 /* use 16-bit connection */
 987                 vmf.vmf_ah = APM_BIOS;
 988                 vmf.vmf_al = APM_PROT16CONNECT;
 989                 vmf.vmf_bx = 0;
 990                 if (vm86_intcall(APM_INT, &vmf)) {
 991                         printf("apm: 16-bit connection error.\n");
 992                         return (ENXIO);
 993                 }
 994                 sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 995                 sc->bios.seg.code16.limit = 0xffff;
 996                 sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 997                 sc->bios.seg.data.limit = 0xffff;
 998                 sc->bios.entry = vmf.vmf_bx;
 999                 sc->connectmode = APM_PROT16CONNECT;
1000         }
1001 #endif
1002         return(0);
1003 }
1004
1005
1006 /*
1007  * return 0 if the user will notice and handle the event,
1008  * return 1 if the kernel driver should do so.
1009  */
1010 static int
1011 apm_record_event(struct apm_softc *sc, u_int event_type)
1012 {
1013         struct apm_event_info *evp;
1014
1015         if ((sc->sc_flags & SCFLAG_OPEN) == 0)
1016                 return 1;               /* no user waiting */
1017         if (sc->event_count == APM_NEVENTS)
1018                 return 1;                       /* overflow */
1019         if (sc->event_filter[event_type] == 0)
1020                 return 1;               /* not registered */
1021         evp = &sc->event_list[sc->event_ptr];
1022         sc->event_count++;
1023         sc->event_ptr++;
1024         sc->event_ptr %= APM_NEVENTS;
1025         evp->type = event_type;
1026         evp->index = ++apm_evindex;
1027         selwakeuppri(&sc->sc_rsel, PZERO);
1028         return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */
1029 }
1030
1031 /* Power profile */
1032 static void
1033 apm_power_profile(struct apm_softc *sc)
1034 {
1035         int state;
1036         struct apm_info info;
1037         static int apm_acline = 0;
1038
1039         if (apm_get_info(&info))
1040                 return;
1041
1042         if (apm_acline != info.ai_acline) {
1043                 apm_acline = info.ai_acline;
1044                 state = apm_acline ? POWER_PROFILE_PERFORMANCE : POWER_PROFILE_ECONOMY;
1045                 power_profile_set_state(state);
1046         }
1047 }
1048
1049 /* Process APM event */
1050 static void
1051 apm_processevent(void)
1052 {
1053         int apm_event;
1054         struct apm_softc *sc = &apm_softc;
1055
1056 #define OPMEV_DEBUGMESSAGE(symbol) case symbol:                         \
1057         APM_DPRINT("Received APM Event: " #symbol "\n");
1058
1059         do {
1060                 apm_event = apm_getevent();
1061                 switch (apm_event) {
1062                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
1063                         if (apm_op_inprog == 0) {
1064                             apm_op_inprog++;
1065                             if (apm_record_event(sc, apm_event)) {
1066                                 apm_suspend(PMST_STANDBY);
1067                             }
1068                         }
1069                         break;
1070                     OPMEV_DEBUGMESSAGE(PMEV_USERSTANDBYREQ);
1071                         if (apm_op_inprog == 0) {
1072                             apm_op_inprog++;
1073                             if (apm_record_event(sc, apm_event)) {
1074                                 apm_suspend(PMST_STANDBY);
1075                             }
1076                         }
1077                         break;
1078                     OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
1079                         apm_lastreq_notify();
1080                         if (apm_op_inprog == 0) {
1081                             apm_op_inprog++;
1082                             if (apm_record_event(sc, apm_event)) {
1083                                 apm_do_suspend();
1084                             }
1085                         }
1086                         return; /* XXX skip the rest */
1087                     OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
1088                         apm_lastreq_notify();
1089                         if (apm_op_inprog == 0) {
1090                             apm_op_inprog++;
1091                             if (apm_record_event(sc, apm_event)) {
1092                                 apm_do_suspend();
1093                             }
1094                         }
1095                         return; /* XXX skip the rest */
1096                     OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
1097                         apm_do_suspend();
1098                         break;
1099                     OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
1100                         apm_record_event(sc, apm_event);
1101                         apm_resume();
1102                         break;
1103                     OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
1104                         apm_record_event(sc, apm_event);
1105                         apm_resume();
1106                         break;
1107                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
1108                         apm_record_event(sc, apm_event);
1109                         break;
1110                     OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
1111                         if (apm_record_event(sc, apm_event)) {
1112                             apm_battery_low();
1113                             apm_suspend(PMST_SUSPEND);
1114                         }
1115                         break;
1116                     OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
1117                         apm_record_event(sc, apm_event);
1118                         apm_power_profile(sc);
1119                         break;
1120                     OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
1121                         apm_record_event(sc, apm_event);
1122                         inittodr(0);    /* adjust time to RTC */
1123                         break;
1124                     OPMEV_DEBUGMESSAGE(PMEV_CAPABILITIESCHANGE);
1125                         apm_record_event(sc, apm_event);
1126                         apm_power_profile(sc);
1127                         break;
1128                     case PMEV_NOEVENT:
1129                         break;
1130                     default:
1131                         printf("Unknown Original APM Event 0x%x\n", apm_event);
1132                             break;
1133                 }
1134         } while (apm_event != PMEV_NOEVENT);
1135 #ifdef PC98
1136         apm_disable_smm(sc);
1137 #endif
1138 }
1139
1140 /*
1141  * Attach APM:
1142  *
1143  * Initialize APM driver
1144  */
1145
1146 static int
1147 apm_attach(device_t dev)
1148 {
1149         struct apm_softc        *sc = &apm_softc;
1150         int                     drv_version;
1151 #ifdef PC98
1152         int                     rid;
1153 #endif
1154         mtx_init(&sc->mtx, device_get_nameunit(dev), "apm", MTX_DEF);
1155         cv_init(&sc->cv, "cbb cv");
1156
1157         if (device_get_flags(dev) & 0x20)
1158                 statclock_disable = 1;
1159
1160         sc->initialized = 0;
1161
1162         /* Must be externally enabled */
1163         sc->active = 0;
1164
1165         /* Always call HLT in idle loop */
1166         sc->always_halt_cpu = 1;
1167
1168         getenv_int("debug.apm_debug", &apm_debug);
1169
1170         /* print bootstrap messages */
1171         APM_DPRINT("apm: APM BIOS version %04lx\n",  apm_version);
1172         APM_DPRINT("apm: Code16 0x%08x, Data 0x%08x\n",
1173             sc->bios.seg.code16.base, sc->bios.seg.data.base);
1174         APM_DPRINT("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
1175             sc->bios.entry, is_enabled(sc->slow_idle_cpu),
1176             is_enabled(!sc->disabled));
1177         APM_DPRINT("apm: CS_limit=0x%x, DS_limit=0x%x\n",
1178             sc->bios.seg.code16.limit, sc->bios.seg.data.limit);
1179
1180 #ifdef PC98
1181         rid = 0;
1182         sc->sc_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
1183                          APM_NECSMM_PORT, ~0, APM_NECSMM_PORTSZ, RF_ACTIVE);
1184         if (sc->sc_res == NULL)
1185                 panic("%s: counldn't map I/O ports", device_get_name(dev));
1186         sc->sc_iot = rman_get_bustag(sc->sc_res);
1187         sc->sc_ioh = rman_get_bushandle(sc->sc_res);
1188
1189         if (apm_version==0x112 || apm_version==0x111 || apm_version==0x110)
1190                 apm_necsmm_addr = APM_NECSMM_PORT;
1191         else
1192                 apm_necsmm_addr = 0;
1193         apm_necsmm_mask = ~APM_NECSMM_EN;
1194 #endif /* PC98 */
1195
1196         /*
1197          * In one test, apm bios version was 1.02; an attempt to register
1198          * a 1.04 driver resulted in a 1.00 connection!  Registering a
1199          * 1.02 driver resulted in a 1.02 connection.
1200          */
1201         drv_version = apm_version > 0x102 ? 0x102 : apm_version;
1202         for (; drv_version > 0x100; drv_version--)
1203                 if (apm_driver_version(drv_version) == 0)
1204                         break;
1205         sc->minorversion = ((drv_version & 0x00f0) >>  4) * 10 +
1206                 ((drv_version & 0x000f) >> 0);
1207         sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 +
1208                 ((apm_version & 0x0f00) >> 8);
1209
1210         sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
1211
1212         if (sc->intversion >= INTVERSION(1, 1))
1213                 APM_DPRINT("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
1214         device_printf(dev, "found APM BIOS v%ld.%ld, connected at v%d.%d\n",
1215                ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8),
1216                ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0),
1217                sc->majorversion, sc->minorversion);
1218
1219
1220         APM_DPRINT("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
1221         /* enable power management */
1222         if (sc->disabled) {
1223                 if (apm_enable_disable_pm(1)) {
1224                         APM_DPRINT("apm: *Warning* enable function failed! [%x]\n",
1225                             (sc->bios.r.eax >> 8) & 0xff);
1226                 }
1227         }
1228
1229         /* engage power managment (APM 1.1 or later) */
1230         if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
1231                 if (apm_engage_disengage_pm(1)) {
1232                         APM_DPRINT("apm: *Warning* engage function failed err=[%x]",
1233                             (sc->bios.r.eax >> 8) & 0xff);
1234                         APM_DPRINT(" (Docked or using external power?).\n");
1235                 }
1236         }
1237
1238         /* Power the system off using APM */
1239         EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL,
1240                               SHUTDOWN_PRI_LAST);
1241
1242         /* Register APM again to pass the correct argument of pm_func. */
1243         power_pm_register(POWER_PM_TYPE_APM, apm_pm_func, sc);
1244
1245         sc->initialized = 1;
1246         sc->suspending = 0;
1247         sc->running = 0;
1248
1249         make_dev(&apm_cdevsw, 0, 0, 5, 0664, "apm");
1250         make_dev(&apm_cdevsw, 8, 0, 5, 0660, "apmctl");
1251         return 0;
1252 }
1253
1254 static int
1255 apmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
1256 {
1257         struct apm_softc *sc = &apm_softc;
1258         int ctl = APMDEV(dev);
1259
1260         if (sc == NULL || sc->initialized == 0)
1261                 return (ENXIO);
1262
1263         switch (ctl) {
1264         case APMDEV_CTL:
1265                 if (!(flag & FWRITE))
1266                         return EINVAL;
1267                 if (sc->sc_flags & SCFLAG_OCTL)
1268                         return EBUSY;
1269                 sc->sc_flags |= SCFLAG_OCTL;
1270                 bzero(sc->event_filter, sizeof sc->event_filter);
1271                 break;
1272         case APMDEV_NORMAL:
1273                 sc->sc_flags |= SCFLAG_ONORMAL;
1274                 break;
1275         default:
1276                 return ENXIO;
1277                 break;
1278         }
1279         return 0;
1280 }
1281
1282 static int
1283 apmclose(struct cdev *dev, int flag, int fmt, struct thread *td)
1284 {
1285         struct apm_softc *sc = &apm_softc;
1286         int ctl = APMDEV(dev);
1287
1288         switch (ctl) {
1289         case APMDEV_CTL:
1290                 apm_lastreq_rejected();
1291                 sc->sc_flags &= ~SCFLAG_OCTL;
1292                 bzero(sc->event_filter, sizeof sc->event_filter);
1293                 break;
1294         case APMDEV_NORMAL:
1295                 sc->sc_flags &= ~SCFLAG_ONORMAL;
1296                 break;
1297         }
1298         if ((sc->sc_flags & SCFLAG_OPEN) == 0) {
1299                 sc->event_count = 0;
1300                 sc->event_ptr = 0;
1301         }
1302         return 0;
1303 }
1304
1305 static int
1306 apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
1307 {
1308         struct apm_softc *sc = &apm_softc;
1309         struct apm_bios_arg *args;
1310         int error = 0;
1311         int ret;
1312         int newstate;
1313
1314         if (sc == NULL || sc->initialized == 0)
1315                 return (ENXIO);
1316
1317         APM_DPRINT("APM ioctl: cmd = 0x%lx\n", cmd);
1318         switch (cmd) {
1319         case APMIO_SUSPEND:
1320                 if (!(flag & FWRITE))
1321                         return (EPERM);
1322                 if (sc->active)
1323                         apm_suspend(PMST_SUSPEND);
1324                 else
1325                         error = EINVAL;
1326                 break;
1327
1328         case APMIO_STANDBY:
1329                 if (!(flag & FWRITE))
1330                         return (EPERM);
1331                 if (sc->active)
1332                         apm_suspend(PMST_STANDBY);
1333                 else
1334                         error = EINVAL;
1335                 break;
1336
1337         case APMIO_GETINFO_OLD:
1338                 {
1339                         struct apm_info info;
1340                         apm_info_old_t aiop;
1341
1342                         if (apm_get_info(&info))
1343                                 error = ENXIO;
1344                         aiop = (apm_info_old_t)addr;
1345                         aiop->ai_major = info.ai_major;
1346                         aiop->ai_minor = info.ai_minor;
1347                         aiop->ai_acline = info.ai_acline;
1348                         aiop->ai_batt_stat = info.ai_batt_stat;
1349                         aiop->ai_batt_life = info.ai_batt_life;
1350                         aiop->ai_status = info.ai_status;
1351                 }
1352                 break;
1353         case APMIO_GETINFO:
1354                 if (apm_get_info((apm_info_t)addr))
1355                         error = ENXIO;
1356                 break;
1357         case APMIO_GETPWSTATUS:
1358                 if (apm_get_pwstatus((apm_pwstatus_t)addr))
1359                         error = ENXIO;
1360                 break;
1361         case APMIO_ENABLE:
1362                 if (!(flag & FWRITE))
1363                         return (EPERM);
1364                 apm_event_enable();
1365                 break;
1366         case APMIO_DISABLE:
1367                 if (!(flag & FWRITE))
1368                         return (EPERM);
1369                 apm_event_disable();
1370                 break;
1371         case APMIO_HALTCPU:
1372                 if (!(flag & FWRITE))
1373                         return (EPERM);
1374                 apm_halt_cpu();
1375                 break;
1376         case APMIO_NOTHALTCPU:
1377                 if (!(flag & FWRITE))
1378                         return (EPERM);
1379                 apm_not_halt_cpu();
1380                 break;
1381         case APMIO_DISPLAY:
1382                 if (!(flag & FWRITE))
1383                         return (EPERM);
1384                 newstate = *(int *)addr;
1385                 if (apm_display(newstate))
1386                         error = ENXIO;
1387                 break;
1388         case APMIO_BIOS:
1389                 if (!(flag & FWRITE))
1390                         return (EPERM);
1391                 /* XXX compatibility with the old interface */
1392                 args = (struct apm_bios_arg *)addr;
1393                 sc->bios.r.eax = args->eax;
1394                 sc->bios.r.ebx = args->ebx;
1395                 sc->bios.r.ecx = args->ecx;
1396                 sc->bios.r.edx = args->edx;
1397                 sc->bios.r.esi = args->esi;
1398                 sc->bios.r.edi = args->edi;
1399                 if ((ret = apm_bioscall())) {
1400                         /*
1401                          * Return code 1 means bios call was unsuccessful.
1402                          * Error code is stored in %ah.
1403                          * Return code -1 means bios call was unsupported
1404                          * in the APM BIOS version.
1405                          */
1406                         if (ret == -1) {
1407                                 error = EINVAL;
1408                         }
1409                 } else {
1410                         /*
1411                          * Return code 0 means bios call was successful.
1412                          * We need only %al and can discard %ah.
1413                          */
1414                         sc->bios.r.eax &= 0xff;
1415                 }
1416                 args->eax = sc->bios.r.eax;
1417                 args->ebx = sc->bios.r.ebx;
1418                 args->ecx = sc->bios.r.ecx;
1419                 args->edx = sc->bios.r.edx;
1420                 args->esi = sc->bios.r.esi;
1421                 args->edi = sc->bios.r.edi;
1422                 break;
1423         default:
1424                 error = EINVAL;
1425                 break;
1426         }
1427
1428         /* for /dev/apmctl */
1429         if (APMDEV(dev) == APMDEV_CTL) {
1430                 struct apm_event_info *evp;
1431                 int i;
1432
1433                 error = 0;
1434                 switch (cmd) {
1435                 case APMIO_NEXTEVENT:
1436                         if (!sc->event_count) {
1437                                 error = EAGAIN;
1438                         } else {
1439                                 evp = (struct apm_event_info *)addr;
1440                                 i = sc->event_ptr + APM_NEVENTS - sc->event_count;
1441                                 i %= APM_NEVENTS;
1442                                 *evp = sc->event_list[i];
1443                                 sc->event_count--;
1444                         }
1445                         break;
1446                 case APMIO_REJECTLASTREQ:
1447                         if (apm_lastreq_rejected()) {
1448                                 error = EINVAL;
1449                         }
1450                         break;
1451                 default:
1452                         error = EINVAL;
1453                         break;
1454                 }
1455         }
1456
1457         return error;
1458 }
1459
1460 static int
1461 apmwrite(struct cdev *dev, struct uio *uio, int ioflag)
1462 {
1463         struct apm_softc *sc = &apm_softc;
1464         u_int event_type;
1465         int error;
1466         u_char enabled;
1467
1468         if (APMDEV(dev) != APMDEV_CTL)
1469                 return(ENODEV);
1470         if (uio->uio_resid != sizeof(u_int))
1471                 return(E2BIG);
1472
1473         if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio)))
1474                 return(error);
1475
1476         if (event_type < 0 || event_type >= APM_NPMEV)
1477                 return(EINVAL);
1478
1479         if (sc->event_filter[event_type] == 0) {
1480                 enabled = 1;
1481         } else {
1482                 enabled = 0;
1483         }
1484         sc->event_filter[event_type] = enabled;
1485         APM_DPRINT("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled));
1486
1487         return uio->uio_resid;
1488 }
1489
1490 static int
1491 apmpoll(struct cdev *dev, int events, struct thread *td)
1492 {
1493         struct apm_softc *sc = &apm_softc;
1494         int revents = 0;
1495
1496         if (events & (POLLIN | POLLRDNORM)) {
1497                 if (sc->event_count) {
1498                         revents |= events & (POLLIN | POLLRDNORM);
1499                 } else {
1500                         selrecord(td, &sc->sc_rsel);
1501                 }
1502         }
1503
1504         return (revents);
1505 }
1506
1507 static device_method_t apm_methods[] = {
1508         /* Device interface */
1509         DEVMETHOD(device_identify,      apm_identify),
1510         DEVMETHOD(device_probe,         apm_probe),
1511         DEVMETHOD(device_attach,        apm_attach),
1512
1513         { 0, 0 }
1514 };
1515
1516 static driver_t apm_driver = {
1517         "apm",
1518         apm_methods,
1519         1,                      /* no softc (XXX) */
1520 };
1521
1522 static devclass_t apm_devclass;
1523
1524 DRIVER_MODULE(apm, legacy, apm_driver, apm_devclass, apm_modevent, 0);
1525 MODULE_VERSION(apm, 1);
1526
1527 static int
1528 apm_pm_func(u_long cmd, void *arg, ...)
1529 {
1530         int     state, apm_state;
1531         int     error;
1532         va_list ap;
1533
1534         error = 0;
1535         switch (cmd) {
1536         case POWER_CMD_SUSPEND:
1537                 va_start(ap, arg);
1538                 state = va_arg(ap, int);
1539                 va_end(ap);
1540
1541                 switch (state) {
1542                 case POWER_SLEEP_STATE_STANDBY:
1543                         apm_state = PMST_STANDBY;
1544                         break;
1545                 case POWER_SLEEP_STATE_SUSPEND:
1546                 case POWER_SLEEP_STATE_HIBERNATE:
1547                         apm_state = PMST_SUSPEND;
1548                         break;
1549                 default:
1550                         error = EINVAL;
1551                         goto out;
1552                 }
1553
1554                 apm_suspend(apm_state);
1555                 break;
1556
1557         default:
1558                 error = EINVAL;
1559                 goto out;
1560         }
1561
1562 out:
1563         return (error);
1564 }
1565
1566 static void
1567 apm_pm_register(void *arg)
1568 {
1569
1570         if (!resource_disabled("apm", 0))
1571                 power_pm_register(POWER_PM_TYPE_APM, apm_pm_func, NULL);
1572 }
1573
1574 SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, apm_pm_register, 0);