sys/dev/acpica/acpi_thermal.c

   1 /*-
   2  * Copyright (c) 2000, 2001 Michael Smith
   3  * Copyright (c) 2000 BSDi
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  *      $FreeBSD$
  28  */
  29
  30 #include "opt_acpi.h"
  31 #include <sys/param.h>
  32 #include <sys/kernel.h>
  33 #include <sys/kthread.h>
  34 #include <sys/lock.h>
  35 #include <sys/mutex.h>
  36 #include <sys/bus.h>
  37 #include <sys/proc.h>
  38 #include <sys/reboot.h>
  39 #include <sys/sysctl.h>
  40 #include <sys/unistd.h>
  41 #include <sys/power.h>
  42
  43 #include "acpi.h"
  44
  45 #include <dev/acpica/acpivar.h>
  46
  47 /*
  48  * Hooks for the ACPI CA debugging infrastructure
  49  */
  50 #define _COMPONENT      ACPI_THERMAL
  51 ACPI_MODULE_NAME("THERMAL")
  52
  53 #define TZ_ZEROC        2732
  54 #define TZ_KELVTOC(x)   (((x) - TZ_ZEROC) / 10), (((x) - TZ_ZEROC) % 10)
  55
  56 #define TZ_NOTIFY_TEMPERATURE   0x80
  57 #define TZ_NOTIFY_DEVICES       0x81
  58 #define TZ_NOTIFY_LEVELS        0x82
  59
  60 #define TZ_POLLRATE     30              /* every 30 seconds by default */
  61
  62 #define TZ_NUMLEVELS    10              /* defined by ACPI spec */
  63 struct acpi_tz_zone {
  64     int         ac[TZ_NUMLEVELS];
  65     ACPI_BUFFER al[TZ_NUMLEVELS];
  66     int         crt;
  67     int         hot;
  68     ACPI_BUFFER psl;
  69     int         psv;
  70     int         tc1;
  71     int         tc2;
  72     int         tsp;
  73     int         tzp;
  74 };
  75
  76
  77 struct acpi_tz_softc {
  78     device_t                    tz_dev;                 /* device handle */
  79     ACPI_HANDLE                 tz_handle;              /* thermal zone handle */
  80     int                         tz_temperature;         /* current temperature */
  81     int                         tz_active;              /* current active cooling */
  82 #define TZ_ACTIVE_NONE          -1
  83     int                         tz_requested;           /* user-requested minimum active cooling */
  84     int                         tz_thflags;             /* current temperature-related flags */
  85 #define TZ_THFLAG_NONE          0
  86 #define TZ_THFLAG_PSV           (1<<0)
  87 #define TZ_THFLAG_HOT           (1<<2)
  88 #define TZ_THFLAG_CRT           (1<<3)
  89     int                         tz_flags;
  90 #define TZ_FLAG_NO_SCP          (1<<0)                  /* no _SCP method */
  91 #define TZ_FLAG_GETPROFILE      (1<<1)                  /* fetch power_profile in timeout */
  92     struct timespec             tz_cooling_started;     /* current cooling starting time */
  93
  94     struct sysctl_ctx_list      tz_sysctl_ctx;          /* sysctl tree */
  95     struct sysctl_oid           *tz_sysctl_tree;
  96
  97     struct acpi_tz_zone         tz_zone;                /* thermal zone parameters */
  98     int                         tz_tmp_updating;
  99 };
 100
 101 static int      acpi_tz_probe(device_t dev);
 102 static int      acpi_tz_attach(device_t dev);
 103 static int      acpi_tz_establish(struct acpi_tz_softc *sc);
 104 static void     acpi_tz_monitor(struct acpi_tz_softc *sc);
 105 static void     acpi_tz_all_off(struct acpi_tz_softc *sc);
 106 static void     acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg);
 107 static void     acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg);
 108 static void     acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data);
 109 static void     acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what);
 110 static int      acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS);
 111 static void     acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context);
 112 static void     acpi_tz_timeout(struct acpi_tz_softc *sc);
 113 static void     acpi_tz_power_profile(void *arg);
 114
 115 static void     acpi_tz_thread(void *arg);
 116 static struct proc *acpi_tz_proc;
 117
 118 static device_method_t acpi_tz_methods[] = {
 119     /* Device interface */
 120     DEVMETHOD(device_probe,     acpi_tz_probe),
 121     DEVMETHOD(device_attach,    acpi_tz_attach),
 122
 123     {0, 0}
 124 };
 125
 126 static driver_t acpi_tz_driver = {
 127     "acpi_tz",
 128     acpi_tz_methods,
 129     sizeof(struct acpi_tz_softc),
 130 };
 131
 132 static devclass_t acpi_tz_devclass;
 133 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0);
 134
 135 static struct sysctl_ctx_list   acpi_tz_sysctl_ctx;
 136 static struct sysctl_oid        *acpi_tz_sysctl_tree;
 137
 138 static int                      acpi_tz_min_runtime = 0;/* minimum cooling run time */
 139 static int                      acpi_tz_polling_rate = TZ_POLLRATE;
 140
 141 /*
 142  * Match an ACPI thermal zone.
 143  */
 144 static int
 145 acpi_tz_probe(device_t dev)
 146 {
 147     int         result;
 148
 149     ACPI_LOCK;
 150
 151     /* no FUNCTION_TRACE - too noisy */
 152
 153     if ((acpi_get_type(dev) == ACPI_TYPE_THERMAL) &&
 154         !acpi_disabled("thermal")) {
 155         device_set_desc(dev, "thermal zone");
 156         result = -10;
 157     } else {
 158         result = ENXIO;
 159     }
 160     ACPI_UNLOCK;
 161     return(result);
 162 }
 163
 164 /*
 165  * Attach to an ACPI thermal zone.
 166  */
 167 static int
 168 acpi_tz_attach(device_t dev)
 169 {
 170     struct acpi_tz_softc        *sc;
 171     struct acpi_softc           *acpi_sc;
 172     int                         error;
 173     char                        oidname[8];
 174
 175     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 176
 177     ACPI_LOCK;
 178
 179     sc = device_get_softc(dev);
 180     sc->tz_dev = dev;
 181     sc->tz_handle = acpi_get_handle(dev);
 182     sc->tz_requested = TZ_ACTIVE_NONE;
 183     sc->tz_tmp_updating = 0;
 184
 185     /*
 186      * Parse the current state of the thermal zone and build control
 187      * structures.
 188      */
 189     if ((error = acpi_tz_establish(sc)) != 0)
 190         goto out;
 191
 192     /*
 193      * Register for any Notify events sent to this zone.
 194      */
 195     AcpiInstallNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY,
 196                              acpi_tz_notify_handler, sc);
 197
 198     /*
 199      * Create our sysctl nodes.
 200      *
 201      * XXX we need a mechanism for adding nodes under ACPI.
 202      */
 203     if (device_get_unit(dev) == 0) {
 204         acpi_sc = acpi_device_get_parent_softc(dev);
 205         sysctl_ctx_init(&acpi_tz_sysctl_ctx);
 206         acpi_tz_sysctl_tree = SYSCTL_ADD_NODE(&acpi_tz_sysctl_ctx,
 207                                               SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
 208                                               OID_AUTO, "thermal", CTLFLAG_RD, 0, "");
 209         SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
 210                        SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
 211                        OID_AUTO, "min_runtime", CTLFLAG_RD | CTLFLAG_RW,
 212                        &acpi_tz_min_runtime, 0, "minimum cooling run time in sec");
 213         SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
 214                        SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
 215                        OID_AUTO, "polling_rate", CTLFLAG_RD | CTLFLAG_RW,
 216                        &acpi_tz_polling_rate, 0, "monitor polling rate");
 217     }
 218     sysctl_ctx_init(&sc->tz_sysctl_ctx);
 219     sprintf(oidname, "tz%d", device_get_unit(dev));
 220     sc->tz_sysctl_tree = SYSCTL_ADD_NODE(&sc->tz_sysctl_ctx,
 221                                          SYSCTL_CHILDREN(acpi_tz_sysctl_tree), OID_AUTO,
 222                                          oidname, CTLFLAG_RD, 0, "");
 223     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 224                    OID_AUTO, "temperature", CTLFLAG_RD,
 225                    &sc->tz_temperature, 0, "current thermal zone temperature");
 226     SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 227                     OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW,
 228                     sc, 0, acpi_tz_active_sysctl, "I", "");
 229
 230     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 231                    OID_AUTO, "thermal_flags", CTLFLAG_RD,
 232                    &sc->tz_thflags, 0, "thermal zone flags");
 233     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 234                    OID_AUTO, "_PSV", CTLFLAG_RD,
 235                    &sc->tz_zone.psv, 0, "");
 236     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 237                    OID_AUTO, "_HOT", CTLFLAG_RD,
 238                    &sc->tz_zone.hot, 0, "");
 239     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 240                    OID_AUTO, "_CRT", CTLFLAG_RD,
 241                    &sc->tz_zone.crt, 0, "");
 242     SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 243                       OID_AUTO, "_ACx", CTLFLAG_RD, &sc->tz_zone.ac,
 244                       sizeof(sc->tz_zone.ac), "I", "");
 245
 246
 247     /*
 248      * Register our power profile event handler, and flag it for a manual
 249      * invocation by our timeout.  We defer it like this so that the rest
 250      * of the subsystem has time to come up.
 251      */
 252     EVENTHANDLER_REGISTER(power_profile_change, acpi_tz_power_profile, sc, 0);
 253     sc->tz_flags |= TZ_FLAG_GETPROFILE;
 254
 255     /*
 256      * Don't bother evaluating/printing the temperature at this point;
 257      * on many systems it'll be bogus until the EC is running.
 258      */
 259
 260     /*
 261      * Create our thread; we only need one, it will service all of the
 262      * thermal zones.
 263      */
 264     if (acpi_tz_proc == NULL) {
 265             error = kthread_create(acpi_tz_thread, NULL, &acpi_tz_proc,
 266                                    RFHIGHPID, "acpi_thermal");
 267             if (error != 0) {
 268                     device_printf(sc->tz_dev, "could not create thread - %d", error);
 269                     goto out;
 270             }
 271     }
 272
 273  out:
 274     ACPI_UNLOCK;
 275
 276     return_VALUE(error);
 277 }
 278
 279 /*
 280  * Parse the current state of this thermal zone and set up to use it.
 281  *
 282  * Note that we may have previous state, which will have to be discarded.
 283  */
 284 static int
 285 acpi_tz_establish(struct acpi_tz_softc *sc)
 286 {
 287     ACPI_OBJECT *obj;
 288     int         i;
 289     char        nbuf[8];
 290
 291     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 292
 293     ACPI_ASSERTLOCK;
 294
 295     /*
 296      * Power everything off and erase any existing state.
 297      */
 298     acpi_tz_all_off(sc);
 299     for (i = 0; i < TZ_NUMLEVELS; i++)
 300         if (sc->tz_zone.al[i].Pointer != NULL)
 301             AcpiOsFree(sc->tz_zone.al[i].Pointer);
 302     if (sc->tz_zone.psl.Pointer != NULL)
 303         AcpiOsFree(sc->tz_zone.psl.Pointer);
 304     bzero(&sc->tz_zone, sizeof(sc->tz_zone));
 305
 306     /*
 307      * Evaluate thermal zone parameters.
 308      */
 309     for (i = 0; i < TZ_NUMLEVELS; i++) {
 310         sprintf(nbuf, "_AC%d", i);
 311         acpi_tz_getparam(sc, nbuf, &sc->tz_zone.ac[i]);
 312         sprintf(nbuf, "_AL%d", i);
 313         sc->tz_zone.al[i].Length = ACPI_ALLOCATE_BUFFER;
 314         sc->tz_zone.al[i].Pointer = NULL;
 315         AcpiEvaluateObject(sc->tz_handle, nbuf, NULL, &sc->tz_zone.al[i]);
 316         obj = (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer;
 317         if (obj != NULL) {
 318             /* should be a package containing a list of power objects */
 319             if (obj->Type != ACPI_TYPE_PACKAGE) {
 320                 device_printf(sc->tz_dev, "%s has unknown object type %d, rejecting\n",
 321                               nbuf, obj->Type);
 322                 return_VALUE(ENXIO);
 323             }
 324         }
 325     }
 326     acpi_tz_getparam(sc, "_CRT", &sc->tz_zone.crt);
 327     acpi_tz_getparam(sc, "_HOT", &sc->tz_zone.hot);
 328     sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER;
 329     sc->tz_zone.psl.Pointer = NULL;
 330     AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl);
 331     acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv);
 332     acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1);
 333     acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2);
 334     acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp);
 335     acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp);
 336
 337     /*
 338      * Sanity-check the values we've been given.
 339      *
 340      * XXX what do we do about systems that give us the same value for
 341      *     more than one of these setpoints?
 342      */
 343     acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT");
 344     acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT");
 345     acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV");
 346     for (i = 0; i < TZ_NUMLEVELS; i++)
 347         acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx");
 348
 349     /*
 350      * Power off everything that we've just been given.
 351      */
 352     acpi_tz_all_off(sc);
 353
 354     return_VALUE(0);
 355 }
 356
 357 static char     *aclevel_string[] =     {
 358         "NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4",
 359         "_AC5", "_AC6", "_AC7", "_AC8", "_AC9" };
 360
 361 static __inline const char *
 362 acpi_tz_aclevel_string(int active)
 363 {
 364         if (active < -1 || active >= TZ_NUMLEVELS) {
 365                 return (aclevel_string[0]);
 366         }
 367
 368         return (aclevel_string[active+1]);
 369 }
 370
 371 /*
 372  * Evaluate the condition of a thermal zone, take appropriate actions.
 373  */
 374 static void
 375 acpi_tz_monitor(struct acpi_tz_softc *sc)
 376 {
 377     int         temp;
 378     int         i;
 379     int         newactive, newflags;
 380     struct      timespec curtime;
 381     ACPI_STATUS status;
 382
 383     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 384
 385     ACPI_ASSERTLOCK;
 386
 387     if (sc->tz_tmp_updating) {
 388         goto out;
 389     }
 390     sc->tz_tmp_updating = 1;
 391
 392     /*
 393      * Get the current temperature.
 394      */
 395     if (ACPI_FAILURE(status = acpi_EvaluateInteger(sc->tz_handle, "_TMP", &temp))) {
 396         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 397             "error fetching current temperature -- %s\n",
 398              AcpiFormatException(status));
 399         /* XXX disable zone? go to max cooling? */
 400         goto out;
 401     }
 402
 403     ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
 404     sc->tz_temperature = temp;
 405
 406     /*
 407      * Work out what we ought to be doing right now.
 408      *
 409      * Note that the _ACx levels sort from hot to cold.
 410      */
 411     newactive = TZ_ACTIVE_NONE;
 412     for (i = TZ_NUMLEVELS - 1; i >= 0; i--) {
 413         if ((sc->tz_zone.ac[i] != -1) && (temp >= sc->tz_zone.ac[i])) {
 414             newactive = i;
 415             if (sc->tz_active != newactive) {
 416                 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 417                     "_AC%d: temperature %d.%d >= setpoint %d.%d\n", i,
 418                     TZ_KELVTOC(temp), TZ_KELVTOC(sc->tz_zone.ac[i]));
 419                 getnanotime(&sc->tz_cooling_started);
 420             }
 421         }
 422     }
 423
 424     /*
 425      * We are going to get _ACx level down (colder side), but give a guaranteed
 426      * minimum cooling run time if requested.
 427      */
 428     if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE &&
 429         (newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) {
 430         getnanotime(&curtime);
 431         timespecsub(&curtime, &sc->tz_cooling_started);
 432         if (curtime.tv_sec < acpi_tz_min_runtime) {
 433             newactive = sc->tz_active;
 434         }
 435     }
 436
 437     /* handle user override of active mode */
 438     if (sc->tz_requested > newactive)
 439         newactive = sc->tz_requested;
 440
 441     /* update temperature-related flags */
 442     newflags = TZ_THFLAG_NONE;
 443     if ((sc->tz_zone.psv != -1) && (temp >= sc->tz_zone.psv))
 444         newflags |= TZ_THFLAG_PSV;
 445     if ((sc->tz_zone.hot != -1) && (temp >= sc->tz_zone.hot))
 446         newflags |= TZ_THFLAG_HOT;
 447     if ((sc->tz_zone.crt != -1) && (temp >= sc->tz_zone.crt))
 448         newflags |= TZ_THFLAG_CRT;
 449
 450     /*
 451      * If the active cooling state has changed, we have to switch things.
 452      */
 453     if (newactive != sc->tz_active) {
 454
 455         /* turn off the cooling devices that are on, if any are */
 456         if (sc->tz_active != TZ_ACTIVE_NONE)
 457             acpi_ForeachPackageObject((ACPI_OBJECT *)sc->tz_zone.al[sc->tz_active].Pointer,
 458                                       acpi_tz_switch_cooler_off, sc);
 459
 460         /* turn on cooling devices that are required, if any are */
 461         if (newactive != TZ_ACTIVE_NONE)
 462             acpi_ForeachPackageObject((ACPI_OBJECT *)sc->tz_zone.al[newactive].Pointer,
 463                                       acpi_tz_switch_cooler_on, sc);
 464         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 465             "switched from %s to %s: %d.%dC\n",
 466             acpi_tz_aclevel_string(sc->tz_active),
 467             acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp));
 468         sc->tz_active = newactive;
 469     }
 470
 471     /*
 472      * XXX (de)activate any passive cooling that may be required.
 473      */
 474
 475     /*
 476      * If we have just become _HOT or _CRT, warn the user.
 477      *
 478      * We should actually shut down at this point, but it's not clear
 479      * that some systems don't actually map _CRT to the same value as _AC0.
 480      */
 481     if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) &&
 482         !(sc->tz_thflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT))) {
 483         device_printf(sc->tz_dev, "WARNING - current temperature (%d.%dC) exceeds system limits\n",
 484                       TZ_KELVTOC(sc->tz_temperature));
 485         /* shutdown_nice(RB_POWEROFF);*/
 486     }
 487     sc->tz_thflags = newflags;
 488
 489 out:
 490     sc->tz_tmp_updating = 0;
 491     return_VOID;
 492 }
 493
 494 /*
 495  * Turn off all the cooling devices.
 496  */
 497 static void
 498 acpi_tz_all_off(struct acpi_tz_softc *sc)
 499 {
 500     int         i;
 501
 502     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 503
 504     ACPI_ASSERTLOCK;
 505
 506     /*
 507      * Scan all the _ALx objects, and turn them all off.
 508      */
 509     for (i = 0; i < TZ_NUMLEVELS; i++) {
 510         if (sc->tz_zone.al[i].Pointer == NULL)
 511             continue;
 512         acpi_ForeachPackageObject((ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
 513                                   acpi_tz_switch_cooler_off, sc);
 514     }
 515
 516     /*
 517      * XXX revert any passive-cooling options.
 518      */
 519
 520     sc->tz_active = TZ_ACTIVE_NONE;
 521     sc->tz_thflags = TZ_THFLAG_NONE;
 522     return_VOID;
 523 }
 524
 525 /*
 526  * Given an object, verify that it's a reference to a device of some sort,
 527  * and try to switch it off.
 528  */
 529 static void
 530 acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg)
 531 {
 532     ACPI_HANDLE         cooler;
 533
 534     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 535
 536     ACPI_ASSERTLOCK;
 537
 538     switch(obj->Type) {
 539     case ACPI_TYPE_ANY:
 540         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n", acpi_name(obj->Reference.Handle)));
 541
 542         acpi_pwr_switch_consumer(obj->Reference.Handle, ACPI_STATE_D3);
 543         break;
 544
 545     case ACPI_TYPE_STRING:
 546         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n", obj->String.Pointer));
 547
 548         /*
 549          * Find the handle for the device and turn it off.
 550          * The String object here seems to contain a fully-qualified path, so we
 551          * don't have to search for it in our parents.
 552          *
 553          * XXX This may not always be the case.
 554          */
 555         if (ACPI_SUCCESS(AcpiGetHandle(NULL, obj->String.Pointer, &cooler)))
 556             acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3);
 557         break;
 558
 559     default:
 560         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to handle unsupported object type %d\n",
 561                           obj->Type));
 562         break;
 563     }
 564     return_VOID;
 565 }
 566
 567 /*
 568  * Given an object, verify that it's a reference to a device of some sort,
 569  * and try to switch it on.
 570  *
 571  * XXX replication of off/on function code is bad, mmmkay?
 572  */
 573 static void
 574 acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg)
 575 {
 576     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)arg;
 577     ACPI_HANDLE                 cooler;
 578     ACPI_STATUS                 status;
 579
 580     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 581
 582     ACPI_ASSERTLOCK;
 583
 584     switch(obj->Type) {
 585     case ACPI_TYPE_ANY:
 586         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n", acpi_name(obj->Reference.Handle)));
 587
 588         if (ACPI_FAILURE(status = acpi_pwr_switch_consumer(obj->Reference.Handle, ACPI_STATE_D0))) {
 589             ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 590                 "failed to activate %s - %s\n", acpi_name(obj->Reference.Handle),
 591                 AcpiFormatException(status));
 592         }
 593         break;
 594
 595     case ACPI_TYPE_STRING:
 596         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n", obj->String.Pointer));
 597
 598         /*
 599          * Find the handle for the device and turn it off.
 600          * The String object here seems to contain a fully-qualified path, so we
 601          * don't have to search for it in our parents.
 602          *
 603          * XXX This may not always be the case.
 604          */
 605         if (ACPI_SUCCESS(AcpiGetHandle(NULL, obj->String.Pointer, &cooler))) {
 606             if (ACPI_FAILURE(status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0))) {
 607                 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 608                     "failed to activate %s - %s\n",
 609                     obj->String.Pointer, AcpiFormatException(status));
 610             }
 611         } else {
 612             ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 613                 "couldn't find %s\n", obj->String.Pointer);
 614         }
 615         break;
 616
 617     default:
 618         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to handle unsupported object type %d\n",
 619                           obj->Type));
 620         break;
 621     }
 622         return_VOID;
 623 }
 624
 625 /*
 626  * Read/debug-print a parameter, default it to -1.
 627  */
 628 static void
 629 acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data)
 630 {
 631
 632     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 633
 634     ACPI_ASSERTLOCK;
 635
 636     if (ACPI_FAILURE(acpi_EvaluateInteger(sc->tz_handle, node, data))) {
 637         *data = -1;
 638     } else {
 639         ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n", acpi_name(sc->tz_handle),
 640                           node, *data));
 641     }
 642     return_VOID;
 643 }
 644
 645 /*
 646  * Sanity-check a temperature value.  Assume that setpoints
 647  * should be between 0C and 150C.
 648  */
 649 static void
 650 acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what)
 651 {
 652     if ((*val != -1) && ((*val < TZ_ZEROC) || (*val > (TZ_ZEROC + 1500)))) {
 653         device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n",
 654                       what, TZ_KELVTOC(*val));
 655         *val = -1;
 656     }
 657 }
 658
 659 /*
 660  * Respond to a sysctl on the active state node.
 661  */
 662 static int
 663 acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
 664 {
 665     struct acpi_tz_softc        *sc;
 666     int                         active;
 667     int                         error;
 668
 669     ACPI_LOCK;
 670
 671     sc = (struct acpi_tz_softc *)oidp->oid_arg1;
 672     active = sc->tz_active;
 673     error = sysctl_handle_int(oidp, &active, 0, req);
 674
 675     /* error or no new value */
 676     if ((error != 0) || (req->newptr == NULL))
 677         goto out;
 678
 679     /* range check */
 680     if ((active < -1) || (active >= TZ_NUMLEVELS)) {
 681         error = EINVAL;
 682         goto out;
 683     }
 684
 685     /* set new preferred level and re-switch */
 686     sc->tz_requested = active;
 687     acpi_tz_monitor(sc);
 688
 689  out:
 690     ACPI_UNLOCK;
 691     return(error);
 692 }
 693
 694 /*
 695  * Respond to a Notify event sent to the zone.
 696  */
 697 static void
 698 acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
 699 {
 700     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)context;
 701
 702     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 703
 704     ACPI_ASSERTLOCK;
 705
 706     switch(notify) {
 707     case TZ_NOTIFY_TEMPERATURE:
 708         /* temperature change occurred */
 709         AcpiOsQueueForExecution(OSD_PRIORITY_HIGH, (OSD_EXECUTION_CALLBACK)acpi_tz_monitor, sc);
 710         break;
 711     case TZ_NOTIFY_DEVICES:
 712     case TZ_NOTIFY_LEVELS:
 713         /* zone devices/setpoints changed */
 714         AcpiOsQueueForExecution(OSD_PRIORITY_HIGH, (OSD_EXECUTION_CALLBACK)acpi_tz_establish, sc);
 715         break;
 716     default:
 717         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 718             "unknown Notify event 0x%x\n", notify);
 719         break;
 720     }
 721     return_VOID;
 722 }
 723
 724 /*
 725  * Poll the thermal zone.
 726  */
 727 static void
 728 acpi_tz_timeout(struct acpi_tz_softc *sc)
 729 {
 730
 731     /* do we need to get the power profile settings? */
 732     if (sc->tz_flags & TZ_FLAG_GETPROFILE) {
 733         acpi_tz_power_profile((void *)sc);
 734         sc->tz_flags &= ~TZ_FLAG_GETPROFILE;
 735     }
 736
 737     ACPI_ASSERTLOCK;
 738
 739     /* check the current temperature and take action based on it */
 740     acpi_tz_monitor(sc);
 741
 742     /* XXX passive cooling actions? */
 743 }
 744
 745 /*
 746  * System power profile may have changed; fetch and notify the
 747  * thermal zone accordingly.
 748  *
 749  * Since this can be called from an arbitrary eventhandler, it needs
 750  * to get the ACPI lock itself.
 751  */
 752 static void
 753 acpi_tz_power_profile(void *arg)
 754 {
 755     ACPI_OBJECT_LIST            args;
 756     ACPI_OBJECT                 obj;
 757     ACPI_STATUS                 status;
 758     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)arg;
 759     int                         state;
 760
 761     state = power_profile_get_state();
 762     if (state != POWER_PROFILE_PERFORMANCE &&
 763         state != POWER_PROFILE_ECONOMY) {
 764         return;
 765     }
 766
 767     ACPI_LOCK;
 768
 769     /* check that we haven't decided there's no _SCP method */
 770     if (!(sc->tz_flags & TZ_FLAG_NO_SCP)) {
 771
 772         /* call _SCP to set the new profile */
 773         obj.Type = ACPI_TYPE_INTEGER;
 774         obj.Integer.Value = (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1;
 775         args.Count = 1;
 776         args.Pointer = &obj;
 777         if (ACPI_FAILURE(status = AcpiEvaluateObject(sc->tz_handle, "_SCP", &args, NULL))) {
 778             if (status != AE_NOT_FOUND)
 779                 ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 780                     "can't evaluate %s._SCP - %s\n", acpi_name(sc->tz_handle),
 781                     AcpiFormatException(status));
 782             sc->tz_flags |= TZ_FLAG_NO_SCP;
 783         } else {
 784             /* we have to re-evaluate the entire zone now */
 785             AcpiOsQueueForExecution(OSD_PRIORITY_HIGH, (OSD_EXECUTION_CALLBACK)acpi_tz_establish, sc);
 786         }
 787     }
 788     ACPI_UNLOCK;
 789 }
 790
 791 /*
 792  * Thermal zone monitor thread.
 793  */
 794 static void
 795 acpi_tz_thread(void *arg)
 796 {
 797     device_t    *devs;
 798     int         devcount, i;
 799
 800     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 801
 802
 803     devs = NULL;
 804     devcount = 0;
 805
 806     for (;;) {
 807         tsleep(&acpi_tz_proc, PZERO, "nothing", hz * acpi_tz_polling_rate);
 808
 809         mtx_lock(&Giant);
 810
 811         if (devcount == 0)
 812             devclass_get_devices(acpi_tz_devclass, &devs, &devcount);
 813
 814         ACPI_LOCK;
 815         for (i = 0; i < devcount; i++)
 816             acpi_tz_timeout(device_get_softc(devs[i]));
 817         ACPI_UNLOCK;
 818
 819         mtx_unlock(&Giant);
 820     }
 821 }