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(dev)     (dev2unit(dev)&0x0f)
  83 #define APMDEV_NORMAL   0
  84 #define APMDEV_CTL      8
  85
  86 #ifdef PC98
  87 extern int bios32_apm98(struct bios_regs *, u_int, u_short);
  88
  89 /* PC98's SMM definition */
  90 #define APM_NECSMM_PORT         0x6b8e
  91 #define APM_NECSMM_PORTSZ       1
  92 #define APM_NECSMM_EN           0x10
  93 static __inline void apm_enable_smm(struct apm_softc *);
  94 static __inline void apm_disable_smm(struct apm_softc *);
  95 int apm_necsmm_addr;
  96 u_int32_t apm_necsmm_mask;
  97 #endif
  98
  99 static struct apmhook   *hook[NAPM_HOOK];               /* XXX */
 100
 101 #define is_enabled(foo) ((foo) ? "enabled" : "disabled")
 102
 103 /* Map version number to integer (keeps ordering of version numbers) */
 104 #define INTVERSION(major, minor)        ((major)*100 + (minor))
 105
 106 static d_open_t apmopen;
 107 static d_close_t apmclose;
 108 static d_write_t apmwrite;
 109 static d_ioctl_t apmioctl;
 110 static d_poll_t apmpoll;
 111
 112 static struct cdevsw apm_cdevsw = {
 113         .d_version =    D_VERSION,
 114         .d_flags =      D_NEEDGIANT,
 115         .d_open =       apmopen,
 116         .d_close =      apmclose,
 117         .d_write =      apmwrite,
 118         .d_ioctl =      apmioctl,
 119         .d_poll =       apmpoll,
 120         .d_name =       "apm",
 121 };
 122
 123 static int apm_suspend_delay = 1;
 124 static int apm_standby_delay = 1;
 125 static int apm_swab_batt_minutes = 0;
 126 static int apm_debug = 0;
 127
 128 #define APM_DPRINT(args...) do  {                                       \
 129         if (apm_debug) {                                                \
 130                 printf(args);                                           \
 131         }                                                               \
 132 } while (0)
 133
 134 SYSCTL_INT(_machdep, OID_AUTO, apm_suspend_delay, CTLFLAG_RW, &apm_suspend_delay, 1, "");
 135 SYSCTL_INT(_machdep, OID_AUTO, apm_standby_delay, CTLFLAG_RW, &apm_standby_delay, 1, "");
 136 SYSCTL_INT(_debug, OID_AUTO, apm_debug, CTLFLAG_RW, &apm_debug, 0, "");
 137
 138 TUNABLE_INT("machdep.apm_swab_batt_minutes", &apm_swab_batt_minutes);
 139 SYSCTL_INT(_machdep, OID_AUTO, apm_swab_batt_minutes, CTLFLAG_RW,
 140            &apm_swab_batt_minutes, 0, "Byte swap battery time value.");
 141
 142 #ifdef PC98
 143 static __inline void
 144 apm_enable_smm(sc)
 145         struct apm_softc *sc;
 146 {
 147         bus_space_tag_t iot = sc->sc_iot;
 148         bus_space_handle_t ioh = sc->sc_ioh;
 149         if (apm_necsmm_addr != 0)
 150                 bus_space_write_1(iot, ioh, 0,
 151                           (bus_space_read_1(iot, ioh, 0) | ~apm_necsmm_mask));
 152 }
 153
 154 static __inline void
 155 apm_disable_smm(sc)
 156         struct apm_softc *sc;
 157 {
 158         bus_space_tag_t iot = sc->sc_iot;
 159         bus_space_handle_t ioh = sc->sc_ioh;
 160         if (apm_necsmm_addr != 0)
 161                 bus_space_write_1(iot, ioh, 0,
 162                           (bus_space_read_1(iot, ioh, 0) & apm_necsmm_mask));
 163 }
 164 #endif
 165
 166 /*
 167  * return  0 if the function successfull,
 168  * return  1 if the function unsuccessfull,
 169  * return -1 if the function unsupported.
 170  */
 171 static int
 172 apm_bioscall(void)
 173 {
 174         struct apm_softc *sc = &apm_softc;
 175         int errno = 0;
 176         u_int apm_func = sc->bios.r.eax & 0xff;
 177
 178         if (!apm_check_function_supported(sc->intversion, apm_func)) {
 179                 APM_DPRINT("apm_bioscall: function 0x%x is not supported in v%d.%d\n",
 180                     apm_func, sc->majorversion, sc->minorversion);
 181                 return (-1);
 182         }
 183
 184         sc->bios_busy = 1;
 185 #ifdef  PC98
 186         set_bios_selectors(&sc->bios.seg, BIOSCODE_FLAG | BIOSDATA_FLAG);
 187         if (bios32_apm98(&sc->bios.r, sc->bios.entry,
 188             GSEL(GBIOSCODE32_SEL, SEL_KPL)) != 0)
 189                 return 1;
 190 #else
 191         if (sc->connectmode == APM_PROT32CONNECT) {
 192                 set_bios_selectors(&sc->bios.seg,
 193                                    BIOSCODE_FLAG | BIOSDATA_FLAG);
 194                 errno = bios32(&sc->bios.r,
 195                                sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL));
 196         } else {
 197                 errno = bios16(&sc->bios, NULL);
 198         }
 199 #endif
 200         sc->bios_busy = 0;
 201         return (errno);
 202 }
 203
 204 /* check whether APM function is supported (1)  or not (0). */
 205 static int
 206 apm_check_function_supported(u_int version, u_int func)
 207 {
 208         /* except driver version */
 209         if (func == APM_DRVVERSION) {
 210                 return (1);
 211         }
 212 #ifdef PC98
 213         if (func == APM_GETPWSTATUS) {
 214                 return (1);
 215         }
 216 #endif
 217
 218         switch (version) {
 219         case INTVERSION(1, 0):
 220                 if (func > APM_GETPMEVENT) {
 221                         return (0); /* not supported */
 222                 }
 223                 break;
 224         case INTVERSION(1, 1):
 225                 if (func > APM_ENGAGEDISENGAGEPM &&
 226                     func < APM_OEMFUNC) {
 227                         return (0); /* not supported */
 228                 }
 229                 break;
 230         case INTVERSION(1, 2):
 231                 break;
 232         }
 233
 234         return (1); /* supported */
 235 }
 236
 237 /* enable/disable power management */
 238 static int
 239 apm_enable_disable_pm(int enable)
 240 {
 241         struct apm_softc *sc = &apm_softc;
 242
 243         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
 244
 245         if (sc->intversion >= INTVERSION(1, 1))
 246                 sc->bios.r.ebx  = PMDV_ALLDEV;
 247         else
 248                 sc->bios.r.ebx  = 0xffff;       /* APM version 1.0 only */
 249         sc->bios.r.ecx  = enable;
 250         sc->bios.r.edx = 0;
 251         return (apm_bioscall());
 252 }
 253
 254 /* register driver version (APM 1.1 or later) */
 255 static int
 256 apm_driver_version(int version)
 257 {
 258         struct apm_softc *sc = &apm_softc;
 259
 260         sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION;
 261         sc->bios.r.ebx  = 0x0;
 262         sc->bios.r.ecx  = version;
 263         sc->bios.r.edx = 0;
 264
 265         if (apm_bioscall() == 0 && sc->bios.r.eax == version)
 266                 return (0);
 267
 268         /* Some old BIOSes don't return the connection version in %ax. */
 269         if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION))
 270                 return (0);
 271
 272         return (1);
 273 }
 274
 275 /* engage/disengage power management (APM 1.1 or later) */
 276 static int
 277 apm_engage_disengage_pm(int engage)
 278 {
 279         struct apm_softc *sc = &apm_softc;
 280
 281         sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
 282         sc->bios.r.ebx = PMDV_ALLDEV;
 283         sc->bios.r.ecx = engage;
 284         sc->bios.r.edx = 0;
 285         return (apm_bioscall());
 286 }
 287
 288 /* get PM event */
 289 static u_int
 290 apm_getevent(void)
 291 {
 292         struct apm_softc *sc = &apm_softc;
 293
 294         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT;
 295
 296         sc->bios.r.ebx = 0;
 297         sc->bios.r.ecx = 0;
 298         sc->bios.r.edx = 0;
 299         if (apm_bioscall())
 300                 return (PMEV_NOEVENT);
 301         return (sc->bios.r.ebx & 0xffff);
 302 }
 303
 304 /* suspend entire system */
 305 static int
 306 apm_suspend_system(int state)
 307 {
 308         struct apm_softc *sc = &apm_softc;
 309
 310         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 311         sc->bios.r.ebx = PMDV_ALLDEV;
 312         sc->bios.r.ecx = state;
 313         sc->bios.r.edx = 0;
 314
 315 #ifdef PC98
 316         apm_disable_smm(sc);
 317 #endif
 318         if (apm_bioscall()) {
 319                 printf("Entire system suspend failure: errcode = %d\n",
 320                        0xff & (sc->bios.r.eax >> 8));
 321                 return 1;
 322         }
 323 #ifdef PC98
 324         apm_enable_smm(sc);
 325 #endif
 326         return 0;
 327 }
 328
 329 /* Display control */
 330 /*
 331  * Experimental implementation: My laptop machine can't handle this function
 332  * If your laptop can control the display via APM, please inform me.
 333  *                            HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
 334  */
 335 int
 336 apm_display(int newstate)
 337 {
 338         struct apm_softc *sc = &apm_softc;
 339
 340         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 341         sc->bios.r.ebx = PMDV_DISP0;
 342         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
 343         sc->bios.r.edx = 0;
 344         if (apm_bioscall() == 0) {
 345                 return 0;
 346         }
 347
 348         /* If failed, then try to blank all display devices instead. */
 349         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 350         sc->bios.r.ebx = PMDV_DISPALL;  /* all display devices */
 351         sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
 352         sc->bios.r.edx = 0;
 353         if (apm_bioscall() == 0) {
 354                 return 0;
 355         }
 356         printf("Display off failure: errcode = %d\n",
 357                0xff & (sc->bios.r.eax >> 8));
 358         return 1;
 359 }
 360
 361 /*
 362  * Turn off the entire system.
 363  */
 364 static void
 365 apm_power_off(void *junk, int howto)
 366 {
 367         struct apm_softc *sc = &apm_softc;
 368
 369         /* Not halting powering off, or not active */
 370         if (!(howto & RB_POWEROFF) || !apm_softc.active)
 371                 return;
 372         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 373         sc->bios.r.ebx = PMDV_ALLDEV;
 374         sc->bios.r.ecx = PMST_OFF;
 375         sc->bios.r.edx = 0;
 376         (void) apm_bioscall();
 377 }
 378
 379 /* APM Battery low handler */
 380 static void
 381 apm_battery_low(void)
 382 {
 383         printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
 384 }
 385
 386 /* APM hook manager */
 387 static struct apmhook *
 388 apm_add_hook(struct apmhook **list, struct apmhook *ah)
 389 {
 390         int s;
 391         struct apmhook *p, *prev;
 392
 393         APM_DPRINT("Add hook \"%s\"\n", ah->ah_name);
 394
 395         s = splhigh();
 396         if (ah == NULL)
 397                 panic("illegal apm_hook!");
 398         prev = NULL;
 399         for (p = *list; p != NULL; prev = p, p = p->ah_next)
 400                 if (p->ah_order > ah->ah_order)
 401                         break;
 402
 403         if (prev == NULL) {
 404                 ah->ah_next = *list;
 405                 *list = ah;
 406         } else {
 407                 ah->ah_next = prev->ah_next;
 408                 prev->ah_next = ah;
 409         }
 410         splx(s);
 411         return ah;
 412 }
 413
 414 static void
 415 apm_del_hook(struct apmhook **list, struct apmhook *ah)
 416 {
 417         int s;
 418         struct apmhook *p, *prev;
 419
 420         s = splhigh();
 421         prev = NULL;
 422         for (p = *list; p != NULL; prev = p, p = p->ah_next)
 423                 if (p == ah)
 424                         goto deleteit;
 425         panic("Tried to delete unregistered apm_hook.");
 426         goto nosuchnode;
 427 deleteit:
 428         if (prev != NULL)
 429                 prev->ah_next = p->ah_next;
 430         else
 431                 *list = p->ah_next;
 432 nosuchnode:
 433         splx(s);
 434 }
 435
 436
 437 /* APM driver calls some functions automatically */
 438 static void
 439 apm_execute_hook(struct apmhook *list)
 440 {
 441         struct apmhook *p;
 442
 443         for (p = list; p != NULL; p = p->ah_next) {
 444                 APM_DPRINT("Execute APM hook \"%s.\"\n", p->ah_name);
 445                 if ((*(p->ah_fun))(p->ah_arg))
 446                         printf("Warning: APM hook \"%s\" failed", p->ah_name);
 447         }
 448 }
 449
 450
 451 /* establish an apm hook */
 452 struct apmhook *
 453 apm_hook_establish(int apmh, struct apmhook *ah)
 454 {
 455         if (apmh < 0 || apmh >= NAPM_HOOK)
 456                 return NULL;
 457
 458         return apm_add_hook(&hook[apmh], ah);
 459 }
 460
 461 /* disestablish an apm hook */
 462 void
 463 apm_hook_disestablish(int apmh, struct apmhook *ah)
 464 {
 465         if (apmh < 0 || apmh >= NAPM_HOOK)
 466                 return;
 467
 468         apm_del_hook(&hook[apmh], ah);
 469 }
 470
 471 static int apm_record_event(struct apm_softc *, u_int);
 472 static void apm_processevent(void);
 473
 474 static u_int apm_op_inprog = 0;
 475
 476 static void
 477 apm_do_suspend(void)
 478 {
 479         struct apm_softc *sc = &apm_softc;
 480         int error;
 481
 482         if (sc == NULL || sc->initialized == 0)
 483                 return;
 484
 485         apm_op_inprog = 0;
 486         sc->suspends = sc->suspend_countdown = 0;
 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                 mtx_unlock(&Giant);
 496                 return;
 497         }
 498
 499         apm_execute_hook(hook[APM_HOOK_SUSPEND]);
 500         if (apm_suspend_system(PMST_SUSPEND) == 0) {
 501                 sc->suspending = 1;
 502                 apm_processevent();
 503         } else {
 504                 /* Failure, 'resume' the system again */
 505                 apm_execute_hook(hook[APM_HOOK_RESUME]);
 506                 DEVICE_RESUME(root_bus);
 507         }
 508         mtx_unlock(&Giant);
 509         return;
 510 }
 511
 512 static void
 513 apm_do_standby(void)
 514 {
 515         struct apm_softc *sc = &apm_softc;
 516
 517         if (sc == NULL || sc->initialized == 0)
 518                 return;
 519
 520         apm_op_inprog = 0;
 521         sc->standbys = sc->standby_countdown = 0;
 522
 523         /*
 524          * As far as standby, we don't need to execute
 525          * all of suspend hooks.
 526          */
 527         if (apm_suspend_system(PMST_STANDBY) == 0)
 528                 apm_processevent();
 529         return;
 530 }
 531
 532 static void
 533 apm_lastreq_notify(void)
 534 {
 535         struct apm_softc *sc = &apm_softc;
 536
 537         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 538         sc->bios.r.ebx = PMDV_ALLDEV;
 539         sc->bios.r.ecx = PMST_LASTREQNOTIFY;
 540         sc->bios.r.edx = 0;
 541         apm_bioscall();
 542 }
 543
 544 static int
 545 apm_lastreq_rejected(void)
 546 {
 547         struct apm_softc *sc = &apm_softc;
 548
 549         if (apm_op_inprog == 0) {
 550                 return 1;       /* no operation in progress */
 551         }
 552
 553         sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
 554         sc->bios.r.ebx = PMDV_ALLDEV;
 555         sc->bios.r.ecx = PMST_LASTREQREJECT;
 556         sc->bios.r.edx = 0;
 557
 558         if (apm_bioscall()) {
 559                 APM_DPRINT("apm_lastreq_rejected: failed\n");
 560                 return 1;
 561         }
 562         apm_op_inprog = 0;
 563         return 0;
 564 }
 565
 566 /*
 567  * Public interface to the suspend/resume:
 568  *
 569  * Execute suspend and resume hook before and after sleep, respectively.
 570  *
 571  */
 572
 573 void
 574 apm_suspend(int state)
 575 {
 576         struct apm_softc *sc = &apm_softc;
 577
 578         if (sc == NULL || sc->initialized == 0)
 579                 return;
 580
 581         switch (state) {
 582         case PMST_SUSPEND:
 583                 if (sc->suspends)
 584                         return;
 585                 sc->suspends++;
 586                 sc->suspend_countdown = apm_suspend_delay;
 587                 break;
 588         case PMST_STANDBY:
 589                 if (sc->standbys)
 590                         return;
 591                 sc->standbys++;
 592                 sc->standby_countdown = apm_standby_delay;
 593                 break;
 594         default:
 595                 printf("apm_suspend: Unknown Suspend state 0x%x\n", state);
 596                 return;
 597         }
 598
 599         apm_op_inprog++;
 600         apm_lastreq_notify();
 601 }
 602
 603 static void
 604 apm_resume(void)
 605 {
 606         struct apm_softc *sc = &apm_softc;
 607
 608         if (sc == NULL || sc->initialized == 0 || sc->suspending == 0)
 609                 return;
 610
 611         sc->suspending = 0;
 612         apm_execute_hook(hook[APM_HOOK_RESUME]);
 613         mtx_lock(&Giant);
 614         DEVICE_RESUME(root_bus);
 615         mtx_unlock(&Giant);
 616         return;
 617 }
 618
 619
 620 /* get power status per battery */
 621 static int
 622 apm_get_pwstatus(apm_pwstatus_t app)
 623 {
 624         struct apm_softc *sc = &apm_softc;
 625
 626         if (app->ap_device != PMDV_ALLDEV &&
 627             (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
 628                 return 1;
 629
 630         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
 631         sc->bios.r.ebx = app->ap_device;
 632         sc->bios.r.ecx = 0;
 633         sc->bios.r.edx = 0xffff;        /* default to unknown battery time */
 634
 635         if (apm_bioscall())
 636                 return 1;
 637
 638         app->ap_acline    = (sc->bios.r.ebx >> 8) & 0xff;
 639         app->ap_batt_stat = sc->bios.r.ebx & 0xff;
 640         app->ap_batt_flag = (sc->bios.r.ecx >> 8) & 0xff;
 641         app->ap_batt_life = sc->bios.r.ecx & 0xff;
 642         sc->bios.r.edx &= 0xffff;
 643         if (apm_swab_batt_minutes)
 644                 sc->bios.r.edx = __bswap16(sc->bios.r.edx) | 0x8000;
 645         if (sc->bios.r.edx == 0xffff)   /* Time is unknown */
 646                 app->ap_batt_time = -1;
 647         else if (sc->bios.r.edx & 0x8000)       /* Time is in minutes */
 648                 app->ap_batt_time = (sc->bios.r.edx & 0x7fff) * 60;
 649         else                            /* Time is in seconds */
 650                 app->ap_batt_time = sc->bios.r.edx;
 651
 652         return 0;
 653 }
 654
 655
 656 /* get APM information */
 657 static int
 658 apm_get_info(apm_info_t aip)
 659 {
 660         struct apm_softc *sc = &apm_softc;
 661         struct apm_pwstatus aps;
 662
 663         bzero(&aps, sizeof(aps));
 664         aps.ap_device = PMDV_ALLDEV;
 665         if (apm_get_pwstatus(&aps))
 666                 return 1;
 667
 668         aip->ai_infoversion = 1;
 669         aip->ai_acline      = aps.ap_acline;
 670         aip->ai_batt_stat   = aps.ap_batt_stat;
 671         aip->ai_batt_life   = aps.ap_batt_life;
 672         aip->ai_batt_time   = aps.ap_batt_time;
 673         aip->ai_major       = (u_int)sc->majorversion;
 674         aip->ai_minor       = (u_int)sc->minorversion;
 675         aip->ai_status      = (u_int)sc->active;
 676
 677         sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES;
 678         sc->bios.r.ebx = 0;
 679         sc->bios.r.ecx = 0;
 680         sc->bios.r.edx = 0;
 681         if (apm_bioscall()) {
 682                 aip->ai_batteries = 0xffffffff; /* Unknown */
 683                 aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */
 684         } else {
 685                 aip->ai_batteries = sc->bios.r.ebx & 0xff;
 686                 aip->ai_capabilities = sc->bios.r.ecx & 0xff;
 687         }
 688
 689         bzero(aip->ai_spare, sizeof aip->ai_spare);
 690
 691         return 0;
 692 }
 693
 694
 695 /* inform APM BIOS that CPU is idle */
 696 void
 697 apm_cpu_idle(void)
 698 {
 699         struct apm_softc *sc = &apm_softc;
 700
 701         if (sc->active) {
 702
 703                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE;
 704                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
 705                 (void) apm_bioscall();
 706         }
 707         /*
 708          * Some APM implementation halts CPU in BIOS, whenever
 709          * "CPU-idle" function are invoked, but swtch() of
 710          * FreeBSD halts CPU, therefore, CPU is halted twice
 711          * in the sched loop. It makes the interrupt latency
 712          * terribly long and be able to cause a serious problem
 713          * in interrupt processing. We prevent it by removing
 714          * "hlt" operation from swtch() and managed it under
 715          * APM driver.
 716          */
 717         if (!sc->active || sc->always_halt_cpu)
 718                 halt(); /* wait for interrupt */
 719 }
 720
 721 /* inform APM BIOS that CPU is busy */
 722 void
 723 apm_cpu_busy(void)
 724 {
 725         struct apm_softc *sc = &apm_softc;
 726
 727         /*
 728          * The APM specification says this is only necessary if your BIOS
 729          * slows down the processor in the idle task, otherwise it's not
 730          * necessary.
 731          */
 732         if (sc->slow_idle_cpu && sc->active) {
 733
 734                 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY;
 735                 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
 736                 apm_bioscall();
 737         }
 738 }
 739
 740
 741 /*
 742  * APM thread loop.
 743  *
 744  * This routine wakes up from time to time to deal with delaying the
 745  * suspend of the system, or other events.
 746  */
 747 static void
 748 apm_event_thread(void *arg)
 749 {
 750         struct apm_softc *sc = &apm_softc;
 751
 752         sc->running = 1;
 753         while (sc->active) {
 754                 if (apm_op_inprog)
 755                         apm_lastreq_notify();
 756                 if (sc->standbys && sc->standby_countdown-- <= 0)
 757                         apm_do_standby();
 758                 if (sc->suspends && sc->suspend_countdown-- <= 0)
 759                         apm_do_suspend();
 760                 if (!sc->bios_busy)
 761                         apm_processevent();
 762                 mtx_lock(&sc->mtx);
 763                 cv_timedwait(&sc->cv, &sc->mtx, 10 * hz / 9);
 764                 mtx_unlock(&sc->mtx);
 765         }
 766         sc->running = 0;
 767         kproc_exit(0);
 768 }
 769
 770 /* enable APM BIOS */
 771 static void
 772 apm_event_enable(void)
 773 {
 774         struct apm_softc *sc = &apm_softc;
 775
 776         APM_DPRINT("called apm_event_enable()\n");
 777
 778         if (sc == NULL || sc->initialized == 0)
 779                 return;
 780
 781         /* Start the thread */
 782         sc->active = 1;
 783         if (kproc_create(apm_event_thread, sc, &sc->event_thread, 0, 0,
 784             "apm worker"))
 785                 panic("Cannot create apm worker thread");
 786
 787         return;
 788 }
 789
 790 /* disable APM BIOS */
 791 static void
 792 apm_event_disable(void)
 793 {
 794         struct apm_softc *sc = &apm_softc;
 795
 796         APM_DPRINT("called apm_event_disable()\n");
 797
 798         if (sc == NULL || sc->initialized == 0)
 799                 return;
 800
 801         mtx_lock(&sc->mtx);
 802         sc->active = 0;
 803         while (sc->running) {
 804                 cv_broadcast(&sc->cv);
 805                 msleep(sc->event_thread, &sc->mtx, PWAIT, "apmdie", 0);
 806         }
 807         mtx_unlock(&sc->mtx);
 808         sc->event_thread = NULL;
 809         return;
 810 }
 811
 812 /* halt CPU in scheduling loop */
 813 static void
 814 apm_halt_cpu(void)
 815 {
 816         struct apm_softc *sc = &apm_softc;
 817
 818         if (sc == NULL || sc->initialized == 0)
 819                 return;
 820
 821         sc->always_halt_cpu = 1;
 822
 823         return;
 824 }
 825
 826 /* don't halt CPU in scheduling loop */
 827 static void
 828 apm_not_halt_cpu(void)
 829 {
 830         struct apm_softc *sc = &apm_softc;
 831
 832         if (sc == NULL || sc->initialized == 0)
 833                 return;
 834
 835         sc->always_halt_cpu = 0;
 836
 837         return;
 838 }
 839
 840 /* device driver definitions */
 841
 842 /*
 843  * Module event
 844  */
 845
 846 static int
 847 apm_modevent(struct module *mod, int event, void *junk)
 848 {
 849
 850         switch (event) {
 851         case MOD_LOAD:
 852                 if (!cold)
 853                         return (EPERM);
 854                 break;
 855         case MOD_UNLOAD:
 856                 if (!cold && power_pm_get_type() == POWER_PM_TYPE_APM)
 857                         return (EBUSY);
 858                 break;
 859         default:
 860                 break;
 861         }
 862
 863         return (0);
 864 }
 865
 866 /*
 867  * Create "connection point"
 868  */
 869 static void
 870 apm_identify(driver_t *driver, device_t parent)
 871 {
 872         device_t child;
 873
 874         if (!cold) {
 875                 printf("Don't load this driver from userland!!\n");
 876                 return;
 877         }
 878
 879         if (resource_disabled("apm", 0))
 880                 return;
 881
 882         child = BUS_ADD_CHILD(parent, 0, "apm", 0);
 883         if (child == NULL)
 884                 panic("apm_identify");
 885 }
 886
 887 /*
 888  * probe for APM BIOS
 889  */
 890 static int
 891 apm_probe(device_t dev)
 892 {
 893 #define APM_KERNBASE    KERNBASE
 894         struct vm86frame        vmf;
 895         struct apm_softc        *sc = &apm_softc;
 896 #ifdef PC98
 897         int                     rid;
 898 #endif
 899
 900         device_set_desc(dev, "APM BIOS");
 901         if (device_get_unit(dev) > 0) {
 902                 printf("apm: Only one APM driver supported.\n");
 903                 return ENXIO;
 904         }
 905
 906         if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
 907             power_pm_get_type() != POWER_PM_TYPE_APM) {
 908                 printf("apm: Other PM system enabled.\n");
 909                 return ENXIO;
 910         }
 911
 912         bzero(&vmf, sizeof(struct vm86frame));          /* safety */
 913         bzero(&apm_softc, sizeof(apm_softc));
 914         vmf.vmf_ah = APM_BIOS;
 915         vmf.vmf_al = APM_INSTCHECK;
 916         vmf.vmf_bx = 0;
 917         if (vm86_intcall(APM_INT, &vmf))
 918                 return ENXIO;                   /* APM not found */
 919         if (vmf.vmf_bx != 0x504d) {
 920                 printf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx);
 921                 return ENXIO;
 922         }
 923         if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) {
 924                 printf("apm: protected mode connections are not supported\n");
 925                 return ENXIO;
 926         }
 927
 928         apm_version = vmf.vmf_ax;
 929         sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0);
 930         sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0);
 931         sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0);
 932
 933         vmf.vmf_ah = APM_BIOS;
 934         vmf.vmf_al = APM_DISCONNECT;
 935         vmf.vmf_bx = 0;
 936         vm86_intcall(APM_INT, &vmf);            /* disconnect, just in case */
 937
 938 #ifdef PC98
 939         /* PC98 have bogos APM 32bit BIOS */
 940         if ((vmf.vmf_cx & APM_32BIT_SUPPORT) == 0)
 941                 return ENXIO;
 942         rid = 0;
 943         bus_set_resource(dev, SYS_RES_IOPORT, rid,
 944                          APM_NECSMM_PORT, APM_NECSMM_PORTSZ);
 945         sc->sc_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
 946                          APM_NECSMM_PORT, ~0, APM_NECSMM_PORTSZ, RF_ACTIVE);
 947         if (sc->sc_res == NULL) {
 948                 printf("apm: cannot open NEC smm device\n");
 949                 return ENXIO;
 950         }
 951         bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->sc_res);
 952
 953         vmf.vmf_ah = APM_BIOS;
 954         vmf.vmf_al = APM_PROT32CONNECT;
 955         vmf.vmf_bx = 0;
 956         if (vm86_intcall(APM_INT, &vmf)) {
 957                 printf("apm: 32-bit connection error.\n");
 958                 return (ENXIO);
 959         }
 960
 961         sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 962         sc->bios.seg.code32.limit = 0xffff;
 963         sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 964         sc->bios.seg.code16.limit = 0xffff;
 965         sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
 966         sc->bios.seg.data.limit = 0xffff;
 967         sc->bios.entry = vmf.vmf_ebx;
 968         sc->connectmode = APM_PROT32CONNECT;
 969 #else
 970         if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) {
 971                 vmf.vmf_ah = APM_BIOS;
 972                 vmf.vmf_al = APM_PROT32CONNECT;
 973                 vmf.vmf_bx = 0;
 974                 if (vm86_intcall(APM_INT, &vmf)) {
 975                         printf("apm: 32-bit connection error.\n");
 976                         return (ENXIO);
 977                 }
 978                 sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 979                 sc->bios.seg.code32.limit = 0xffff;
 980                 sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 981                 sc->bios.seg.code16.limit = 0xffff;
 982                 sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
 983                 sc->bios.seg.data.limit = 0xffff;
 984                 sc->bios.entry = vmf.vmf_ebx;
 985                 sc->connectmode = APM_PROT32CONNECT;
 986         } else {
 987                 /* use 16-bit connection */
 988                 vmf.vmf_ah = APM_BIOS;
 989                 vmf.vmf_al = APM_PROT16CONNECT;
 990                 vmf.vmf_bx = 0;
 991                 if (vm86_intcall(APM_INT, &vmf)) {
 992                         printf("apm: 16-bit connection error.\n");
 993                         return (ENXIO);
 994                 }
 995                 sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
 996                 sc->bios.seg.code16.limit = 0xffff;
 997                 sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
 998                 sc->bios.seg.data.limit = 0xffff;
 999                 sc->bios.entry = vmf.vmf_bx;
1000                 sc->connectmode = APM_PROT16CONNECT;
1001         }
1002 #endif
1003         return(0);
1004 }
1005
1006
1007 /*
1008  * return 0 if the user will notice and handle the event,
1009  * return 1 if the kernel driver should do so.
1010  */
1011 static int
1012 apm_record_event(struct apm_softc *sc, u_int event_type)
1013 {
1014         struct apm_event_info *evp;
1015
1016         if ((sc->sc_flags & SCFLAG_OPEN) == 0)
1017                 return 1;               /* no user waiting */
1018         if (sc->event_count == APM_NEVENTS)
1019                 return 1;                       /* overflow */
1020         if (sc->event_filter[event_type] == 0)
1021                 return 1;               /* not registered */
1022         evp = &sc->event_list[sc->event_ptr];
1023         sc->event_count++;
1024         sc->event_ptr++;
1025         sc->event_ptr %= APM_NEVENTS;
1026         evp->type = event_type;
1027         evp->index = ++apm_evindex;
1028         selwakeuppri(&sc->sc_rsel, PZERO);
1029         return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */
1030 }
1031
1032 /* Power profile */
1033 static void
1034 apm_power_profile(struct apm_softc *sc)
1035 {
1036         int state;
1037         struct apm_info info;
1038         static int apm_acline = 0;
1039
1040         if (apm_get_info(&info))
1041                 return;
1042
1043         if (apm_acline != info.ai_acline) {
1044                 apm_acline = info.ai_acline;
1045                 state = apm_acline ? POWER_PROFILE_PERFORMANCE : POWER_PROFILE_ECONOMY;
1046                 power_profile_set_state(state);
1047         }
1048 }
1049
1050 /* Process APM event */
1051 static void
1052 apm_processevent(void)
1053 {
1054         int apm_event;
1055         struct apm_softc *sc = &apm_softc;
1056
1057 #define OPMEV_DEBUGMESSAGE(symbol) case symbol:                         \
1058         APM_DPRINT("Received APM Event: " #symbol "\n");
1059
1060         do {
1061                 apm_event = apm_getevent();
1062                 switch (apm_event) {
1063                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
1064                         if (apm_op_inprog == 0) {
1065                             apm_op_inprog++;
1066                             if (apm_record_event(sc, apm_event)) {
1067                                 apm_suspend(PMST_STANDBY);
1068                             }
1069                         }
1070                         break;
1071                     OPMEV_DEBUGMESSAGE(PMEV_USERSTANDBYREQ);
1072                         if (apm_op_inprog == 0) {
1073                             apm_op_inprog++;
1074                             if (apm_record_event(sc, apm_event)) {
1075                                 apm_suspend(PMST_STANDBY);
1076                             }
1077                         }
1078                         break;
1079                     OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
1080                         apm_lastreq_notify();
1081                         if (apm_op_inprog == 0) {
1082                             apm_op_inprog++;
1083                             if (apm_record_event(sc, apm_event)) {
1084                                 apm_do_suspend();
1085                             }
1086                         }
1087                         return; /* XXX skip the rest */
1088                     OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
1089                         apm_lastreq_notify();
1090                         if (apm_op_inprog == 0) {
1091                             apm_op_inprog++;
1092                             if (apm_record_event(sc, apm_event)) {
1093                                 apm_do_suspend();
1094                             }
1095                         }
1096                         return; /* XXX skip the rest */
1097                     OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
1098                         apm_do_suspend();
1099                         break;
1100                     OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
1101                         apm_record_event(sc, apm_event);
1102                         apm_resume();
1103                         break;
1104                     OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
1105                         apm_record_event(sc, apm_event);
1106                         apm_resume();
1107                         break;
1108                     OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
1109                         apm_record_event(sc, apm_event);
1110                         break;
1111                     OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
1112                         if (apm_record_event(sc, apm_event)) {
1113                             apm_battery_low();
1114                             apm_suspend(PMST_SUSPEND);
1115                         }
1116                         break;
1117                     OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
1118                         apm_record_event(sc, apm_event);
1119                         apm_power_profile(sc);
1120                         break;
1121                     OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
1122                         apm_record_event(sc, apm_event);
1123                         inittodr(0);    /* adjust time to RTC */
1124                         break;
1125                     OPMEV_DEBUGMESSAGE(PMEV_CAPABILITIESCHANGE);
1126                         apm_record_event(sc, apm_event);
1127                         apm_power_profile(sc);
1128                         break;
1129                     case PMEV_NOEVENT:
1130                         break;
1131                     default:
1132                         printf("Unknown Original APM Event 0x%x\n", apm_event);
1133                             break;
1134                 }
1135         } while (apm_event != PMEV_NOEVENT);
1136 #ifdef PC98
1137         apm_disable_smm(sc);
1138 #endif
1139 }
1140
1141 /*
1142  * Attach APM:
1143  *
1144  * Initialize APM driver
1145  */
1146
1147 static int
1148 apm_attach(device_t dev)
1149 {
1150         struct apm_softc        *sc = &apm_softc;
1151         int                     drv_version;
1152 #ifdef PC98
1153         int                     rid;
1154 #endif
1155         mtx_init(&sc->mtx, device_get_nameunit(dev), "apm", MTX_DEF);
1156         cv_init(&sc->cv, "cbb cv");
1157
1158 #ifndef PC98
1159         if (device_get_flags(dev) & 0x20)
1160                 atrtcclock_disable = 1;
1161 #endif
1162
1163         sc->initialized = 0;
1164
1165         /* Must be externally enabled */
1166         sc->active = 0;
1167
1168         /* Always call HLT in idle loop */
1169         sc->always_halt_cpu = 1;
1170
1171         getenv_int("debug.apm_debug", &apm_debug);
1172
1173         /* print bootstrap messages */
1174         APM_DPRINT("apm: APM BIOS version %04lx\n",  apm_version);
1175         APM_DPRINT("apm: Code16 0x%08x, Data 0x%08x\n",
1176             sc->bios.seg.code16.base, sc->bios.seg.data.base);
1177         APM_DPRINT("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
1178             sc->bios.entry, is_enabled(sc->slow_idle_cpu),
1179             is_enabled(!sc->disabled));
1180         APM_DPRINT("apm: CS_limit=0x%x, DS_limit=0x%x\n",
1181             sc->bios.seg.code16.limit, sc->bios.seg.data.limit);
1182
1183 #ifdef PC98
1184         rid = 0;
1185         sc->sc_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
1186                          APM_NECSMM_PORT, ~0, APM_NECSMM_PORTSZ, RF_ACTIVE);
1187         if (sc->sc_res == NULL)
1188                 panic("%s: counldn't map I/O ports", device_get_name(dev));
1189         sc->sc_iot = rman_get_bustag(sc->sc_res);
1190         sc->sc_ioh = rman_get_bushandle(sc->sc_res);
1191
1192         if (apm_version==0x112 || apm_version==0x111 || apm_version==0x110)
1193                 apm_necsmm_addr = APM_NECSMM_PORT;
1194         else
1195                 apm_necsmm_addr = 0;
1196         apm_necsmm_mask = ~APM_NECSMM_EN;
1197 #endif /* PC98 */
1198
1199         /*
1200          * In one test, apm bios version was 1.02; an attempt to register
1201          * a 1.04 driver resulted in a 1.00 connection!  Registering a
1202          * 1.02 driver resulted in a 1.02 connection.
1203          */
1204         drv_version = apm_version > 0x102 ? 0x102 : apm_version;
1205         for (; drv_version > 0x100; drv_version--)
1206                 if (apm_driver_version(drv_version) == 0)
1207                         break;
1208         sc->minorversion = ((drv_version & 0x00f0) >>  4) * 10 +
1209                 ((drv_version & 0x000f) >> 0);
1210         sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 +
1211                 ((apm_version & 0x0f00) >> 8);
1212
1213         sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
1214
1215         if (sc->intversion >= INTVERSION(1, 1))
1216                 APM_DPRINT("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
1217         device_printf(dev, "found APM BIOS v%ld.%ld, connected at v%d.%d\n",
1218                ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8),
1219                ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0),
1220                sc->majorversion, sc->minorversion);
1221
1222
1223         APM_DPRINT("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
1224         /* enable power management */
1225         if (sc->disabled) {
1226                 if (apm_enable_disable_pm(1)) {
1227                         APM_DPRINT("apm: *Warning* enable function failed! [%x]\n",
1228                             (sc->bios.r.eax >> 8) & 0xff);
1229                 }
1230         }
1231
1232         /* engage power managment (APM 1.1 or later) */
1233         if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
1234                 if (apm_engage_disengage_pm(1)) {
1235                         APM_DPRINT("apm: *Warning* engage function failed err=[%x]",
1236                             (sc->bios.r.eax >> 8) & 0xff);
1237                         APM_DPRINT(" (Docked or using external power?).\n");
1238                 }
1239         }
1240
1241         /* Power the system off using APM */
1242         EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL,
1243                               SHUTDOWN_PRI_LAST);
1244
1245         /* Register APM again to pass the correct argument of pm_func. */
1246         power_pm_register(POWER_PM_TYPE_APM, apm_pm_func, sc);
1247
1248         sc->initialized = 1;
1249         sc->suspending = 0;
1250         sc->running = 0;
1251
1252         make_dev(&apm_cdevsw, 0, 0, 5, 0664, "apm");
1253         make_dev(&apm_cdevsw, 8, 0, 5, 0660, "apmctl");
1254         return 0;
1255 }
1256
1257 static int
1258 apmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
1259 {
1260         struct apm_softc *sc = &apm_softc;
1261         int ctl = APMDEV(dev);
1262
1263         if (sc == NULL || sc->initialized == 0)
1264                 return (ENXIO);
1265
1266         switch (ctl) {
1267         case APMDEV_CTL:
1268                 if (!(flag & FWRITE))
1269                         return EINVAL;
1270                 if (sc->sc_flags & SCFLAG_OCTL)
1271                         return EBUSY;
1272                 sc->sc_flags |= SCFLAG_OCTL;
1273                 bzero(sc->event_filter, sizeof sc->event_filter);
1274                 break;
1275         case APMDEV_NORMAL:
1276                 sc->sc_flags |= SCFLAG_ONORMAL;
1277                 break;
1278         default:
1279                 return ENXIO;
1280                 break;
1281         }
1282         return 0;
1283 }
1284
1285 static int
1286 apmclose(struct cdev *dev, int flag, int fmt, struct thread *td)
1287 {
1288         struct apm_softc *sc = &apm_softc;
1289         int ctl = APMDEV(dev);
1290
1291         switch (ctl) {
1292         case APMDEV_CTL:
1293                 apm_lastreq_rejected();
1294                 sc->sc_flags &= ~SCFLAG_OCTL;
1295                 bzero(sc->event_filter, sizeof sc->event_filter);
1296                 break;
1297         case APMDEV_NORMAL:
1298                 sc->sc_flags &= ~SCFLAG_ONORMAL;
1299                 break;
1300         }
1301         if ((sc->sc_flags & SCFLAG_OPEN) == 0) {
1302                 sc->event_count = 0;
1303                 sc->event_ptr = 0;
1304         }
1305         return 0;
1306 }
1307
1308 static int
1309 apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
1310 {
1311         struct apm_softc *sc = &apm_softc;
1312         struct apm_bios_arg *args;
1313         int error = 0;
1314         int ret;
1315         int newstate;
1316
1317         if (sc == NULL || sc->initialized == 0)
1318                 return (ENXIO);
1319
1320         APM_DPRINT("APM ioctl: cmd = 0x%lx\n", cmd);
1321         switch (cmd) {
1322         case APMIO_SUSPEND:
1323                 if (!(flag & FWRITE))
1324                         return (EPERM);
1325                 if (sc->active)
1326                         apm_suspend(PMST_SUSPEND);
1327                 else
1328                         error = EINVAL;
1329                 break;
1330
1331         case APMIO_STANDBY:
1332                 if (!(flag & FWRITE))
1333                         return (EPERM);
1334                 if (sc->active)
1335                         apm_suspend(PMST_STANDBY);
1336                 else
1337                         error = EINVAL;
1338                 break;
1339
1340         case APMIO_GETINFO_OLD:
1341                 {
1342                         struct apm_info info;
1343                         apm_info_old_t aiop;
1344
1345                         if (apm_get_info(&info))
1346                                 error = ENXIO;
1347                         aiop = (apm_info_old_t)addr;
1348                         aiop->ai_major = info.ai_major;
1349                         aiop->ai_minor = info.ai_minor;
1350                         aiop->ai_acline = info.ai_acline;
1351                         aiop->ai_batt_stat = info.ai_batt_stat;
1352                         aiop->ai_batt_life = info.ai_batt_life;
1353                         aiop->ai_status = info.ai_status;
1354                 }
1355                 break;
1356         case APMIO_GETINFO:
1357                 if (apm_get_info((apm_info_t)addr))
1358                         error = ENXIO;
1359                 break;
1360         case APMIO_GETPWSTATUS:
1361                 if (apm_get_pwstatus((apm_pwstatus_t)addr))
1362                         error = ENXIO;
1363                 break;
1364         case APMIO_ENABLE:
1365                 if (!(flag & FWRITE))
1366                         return (EPERM);
1367                 apm_event_enable();
1368                 break;
1369         case APMIO_DISABLE:
1370                 if (!(flag & FWRITE))
1371                         return (EPERM);
1372                 apm_event_disable();
1373                 break;
1374         case APMIO_HALTCPU:
1375                 if (!(flag & FWRITE))
1376                         return (EPERM);
1377                 apm_halt_cpu();
1378                 break;
1379         case APMIO_NOTHALTCPU:
1380                 if (!(flag & FWRITE))
1381                         return (EPERM);
1382                 apm_not_halt_cpu();
1383                 break;
1384         case APMIO_DISPLAY:
1385                 if (!(flag & FWRITE))
1386                         return (EPERM);
1387                 newstate = *(int *)addr;
1388                 if (apm_display(newstate))
1389                         error = ENXIO;
1390                 break;
1391         case APMIO_BIOS:
1392                 if (!(flag & FWRITE))
1393                         return (EPERM);
1394                 /* XXX compatibility with the old interface */
1395                 args = (struct apm_bios_arg *)addr;
1396                 sc->bios.r.eax = args->eax;
1397                 sc->bios.r.ebx = args->ebx;
1398                 sc->bios.r.ecx = args->ecx;
1399                 sc->bios.r.edx = args->edx;
1400                 sc->bios.r.esi = args->esi;
1401                 sc->bios.r.edi = args->edi;
1402                 if ((ret = apm_bioscall())) {
1403                         /*
1404                          * Return code 1 means bios call was unsuccessful.
1405                          * Error code is stored in %ah.
1406                          * Return code -1 means bios call was unsupported
1407                          * in the APM BIOS version.
1408                          */
1409                         if (ret == -1) {
1410                                 error = EINVAL;
1411                         }
1412                 } else {
1413                         /*
1414                          * Return code 0 means bios call was successful.
1415                          * We need only %al and can discard %ah.
1416                          */
1417                         sc->bios.r.eax &= 0xff;
1418                 }
1419                 args->eax = sc->bios.r.eax;
1420                 args->ebx = sc->bios.r.ebx;
1421                 args->ecx = sc->bios.r.ecx;
1422                 args->edx = sc->bios.r.edx;
1423                 args->esi = sc->bios.r.esi;
1424                 args->edi = sc->bios.r.edi;
1425                 break;
1426         default:
1427                 error = EINVAL;
1428                 break;
1429         }
1430
1431         /* for /dev/apmctl */
1432         if (APMDEV(dev) == APMDEV_CTL) {
1433                 struct apm_event_info *evp;
1434                 int i;
1435
1436                 error = 0;
1437                 switch (cmd) {
1438                 case APMIO_NEXTEVENT:
1439                         if (!sc->event_count) {
1440                                 error = EAGAIN;
1441                         } else {
1442                                 evp = (struct apm_event_info *)addr;
1443                                 i = sc->event_ptr + APM_NEVENTS - sc->event_count;
1444                                 i %= APM_NEVENTS;
1445                                 *evp = sc->event_list[i];
1446                                 sc->event_count--;
1447                         }
1448                         break;
1449                 case APMIO_REJECTLASTREQ:
1450                         if (apm_lastreq_rejected()) {
1451                                 error = EINVAL;
1452                         }
1453                         break;
1454                 default:
1455                         error = EINVAL;
1456                         break;
1457                 }
1458         }
1459
1460         return error;
1461 }
1462
1463 static int
1464 apmwrite(struct cdev *dev, struct uio *uio, int ioflag)
1465 {
1466         struct apm_softc *sc = &apm_softc;
1467         u_int event_type;
1468         int error;
1469         u_char enabled;
1470
1471         if (APMDEV(dev) != APMDEV_CTL)
1472                 return(ENODEV);
1473         if (uio->uio_resid != sizeof(u_int))
1474                 return(E2BIG);
1475
1476         if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio)))
1477                 return(error);
1478
1479         if (event_type < 0 || event_type >= APM_NPMEV)
1480                 return(EINVAL);
1481
1482         if (sc->event_filter[event_type] == 0) {
1483                 enabled = 1;
1484         } else {
1485                 enabled = 0;
1486         }
1487         sc->event_filter[event_type] = enabled;
1488         APM_DPRINT("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled));
1489
1490         return uio->uio_resid;
1491 }
1492
1493 static int
1494 apmpoll(struct cdev *dev, int events, struct thread *td)
1495 {
1496         struct apm_softc *sc = &apm_softc;
1497         int revents = 0;
1498
1499         if (events & (POLLIN | POLLRDNORM)) {
1500                 if (sc->event_count) {
1501                         revents |= events & (POLLIN | POLLRDNORM);
1502                 } else {
1503                         selrecord(td, &sc->sc_rsel);
1504                 }
1505         }
1506
1507         return (revents);
1508 }
1509
1510 static device_method_t apm_methods[] = {
1511         /* Device interface */
1512         DEVMETHOD(device_identify,      apm_identify),
1513         DEVMETHOD(device_probe,         apm_probe),
1514         DEVMETHOD(device_attach,        apm_attach),
1515
1516         { 0, 0 }
1517 };
1518
1519 static driver_t apm_driver = {
1520         "apm",
1521         apm_methods,
1522         1,                      /* no softc (XXX) */
1523 };
1524
1525 static devclass_t apm_devclass;
1526
1527 DRIVER_MODULE(apm, legacy, apm_driver, apm_devclass, apm_modevent, 0);
1528 MODULE_VERSION(apm, 1);
1529
1530 static int
1531 apm_pm_func(u_long cmd, void *arg, ...)
1532 {
1533         int     state, apm_state;
1534         int     error;
1535         va_list ap;
1536
1537         error = 0;
1538         switch (cmd) {
1539         case POWER_CMD_SUSPEND:
1540                 va_start(ap, arg);
1541                 state = va_arg(ap, int);
1542                 va_end(ap);
1543
1544                 switch (state) {
1545                 case POWER_SLEEP_STATE_STANDBY:
1546                         apm_state = PMST_STANDBY;
1547                         break;
1548                 case POWER_SLEEP_STATE_SUSPEND:
1549                 case POWER_SLEEP_STATE_HIBERNATE:
1550                         apm_state = PMST_SUSPEND;
1551                         break;
1552                 default:
1553                         error = EINVAL;
1554                         goto out;
1555                 }
1556
1557                 apm_suspend(apm_state);
1558                 break;
1559
1560         default:
1561                 error = EINVAL;
1562                 goto out;
1563         }
1564
1565 out:
1566         return (error);
1567 }
1568
1569 static void
1570 apm_pm_register(void *arg)
1571 {
1572
1573         if (!resource_disabled("apm", 0))
1574                 power_pm_register(POWER_PM_TYPE_APM, apm_pm_func, NULL);
1575 }
1576
1577 SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, apm_pm_register, 0);