sys/dev/acpica5/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: src/sys/dev/acpica/acpi_thermal.c,v 1.47 2004/05/30 20:08:23 phk Exp $
  28  * $DragonFly: src/sys/dev/acpica5/acpi_thermal.c,v 1.7 2007/01/17 18:31:19 y0netan1 Exp $
  29  */
  30
  31 #include "opt_acpi.h"
  32 #include <sys/param.h>
  33 #include <sys/kernel.h>
  34 #include <sys/kthread.h>
  35 #include <sys/module.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 #include <sys/thread2.h>
  43
  44 #include "acpi.h"
  45 #include <dev/acpica5/acpivar.h>
  46
  47 /* Hooks for the ACPI CA debugging infrastructure */
  48 #define _COMPONENT      ACPI_THERMAL
  49 ACPI_MODULE_NAME("THERMAL")
  50
  51 #define TZ_ZEROC        2732
  52 #define TZ_KELVTOC(x)   (((x) - TZ_ZEROC) / 10), (((x) - TZ_ZEROC) % 10)
  53
  54 #define TZ_NOTIFY_TEMPERATURE   0x80 /* Temperature changed. */
  55 #define TZ_NOTIFY_LEVELS        0x81 /* Cooling levels changed. */
  56 #define TZ_NOTIFY_DEVICES       0x82 /* Device lists changed. */
  57 #define TZ_NOTIFY_CRITICAL      0xcc /* Fake notify that _CRT/_HOT reached. */
  58
  59 /* Check for temperature changes every 10 seconds by default */
  60 #define TZ_POLLRATE     10
  61
  62 /* Make sure the reported temperature is valid for this number of polls. */
  63 #define TZ_VALIDCHECKS  3
  64
  65 /* Notify the user we will be shutting down in one more poll cycle. */
  66 #define TZ_NOTIFYCOUNT  (TZ_VALIDCHECKS - 1)
  67
  68 /* ACPI spec defines this */
  69 #define TZ_NUMLEVELS    10
  70 struct acpi_tz_zone {
  71     int         ac[TZ_NUMLEVELS];
  72     ACPI_BUFFER al[TZ_NUMLEVELS];
  73     int         crt;
  74     int         hot;
  75     ACPI_BUFFER psl;
  76     int         psv;
  77     int         tc1;
  78     int         tc2;
  79     int         tsp;
  80     int         tzp;
  81 };
  82
  83 struct acpi_tz_softc {
  84     device_t                    tz_dev;
  85     ACPI_HANDLE                 tz_handle;      /*Thermal zone handle*/
  86     int                         tz_temperature; /*Current temperature*/
  87     int                         tz_active;      /*Current active cooling*/
  88 #define TZ_ACTIVE_NONE          -1
  89     int                         tz_requested;   /*Minimum active cooling*/
  90     int                         tz_thflags;     /*Current temp-related flags*/
  91 #define TZ_THFLAG_NONE          0
  92 #define TZ_THFLAG_PSV           (1<<0)
  93 #define TZ_THFLAG_HOT           (1<<2)
  94 #define TZ_THFLAG_CRT           (1<<3)
  95     int                         tz_flags;
  96 #define TZ_FLAG_NO_SCP          (1<<0)          /*No _SCP method*/
  97 #define TZ_FLAG_GETPROFILE      (1<<1)          /*Get power_profile in timeout*/
  98     struct timespec             tz_cooling_started;
  99                                         /*Current cooling starting time*/
 100
 101     struct sysctl_ctx_list      tz_sysctl_ctx;
 102     struct sysctl_oid           *tz_sysctl_tree;
 103
 104     struct acpi_tz_zone         tz_zone;        /*Thermal zone parameters*/
 105     int                         tz_tmp_updating;
 106     int                         tz_validchecks;
 107 };
 108
 109 static int      acpi_tz_probe(device_t dev);
 110 static int      acpi_tz_attach(device_t dev);
 111 static int      acpi_tz_establish(struct acpi_tz_softc *sc);
 112 static void     acpi_tz_monitor(void *Context);
 113 static void     acpi_tz_all_off(struct acpi_tz_softc *sc);
 114 static void     acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg);
 115 static void     acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg);
 116 static void     acpi_tz_getparam(struct acpi_tz_softc *sc, char *node,
 117                                  int *data);
 118 static void     acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what);
 119 static int      acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS);
 120 static void     acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify,
 121                                        void *context);
 122 static void     acpi_tz_timeout(struct acpi_tz_softc *sc);
 123 static void     acpi_tz_power_profile(void *arg);
 124 static void     acpi_tz_thread(void *arg);
 125
 126 static device_method_t acpi_tz_methods[] = {
 127     /* Device interface */
 128     DEVMETHOD(device_probe,     acpi_tz_probe),
 129     DEVMETHOD(device_attach,    acpi_tz_attach),
 130
 131     {0, 0}
 132 };
 133
 134 static driver_t acpi_tz_driver = {
 135     "acpi_tz",
 136     acpi_tz_methods,
 137     sizeof(struct acpi_tz_softc),
 138 };
 139
 140 static devclass_t acpi_tz_devclass;
 141 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0);
 142 MODULE_DEPEND(acpi_tz, acpi, 1, 1, 1);
 143
 144 static struct sysctl_ctx_list   acpi_tz_sysctl_ctx;
 145 static struct sysctl_oid        *acpi_tz_sysctl_tree;
 146
 147 /* Minimum cooling run time */
 148 static int                      acpi_tz_min_runtime = 0;
 149 static int                      acpi_tz_polling_rate = TZ_POLLRATE;
 150
 151 /* Timezone polling thread */
 152 static struct thread            *acpi_tz_td;
 153
 154 /*
 155  * Match an ACPI thermal zone.
 156  */
 157 static int
 158 acpi_tz_probe(device_t dev)
 159 {
 160     int         result;
 161     ACPI_LOCK_DECL;
 162
 163     ACPI_LOCK;
 164
 165     /* No FUNCTION_TRACE - too noisy */
 166
 167     if (acpi_get_type(dev) == ACPI_TYPE_THERMAL && !acpi_disabled("thermal")) {
 168         device_set_desc(dev, "Thermal Zone");
 169         result = -10;
 170     } else {
 171         result = ENXIO;
 172     }
 173     ACPI_UNLOCK;
 174     return (result);
 175 }
 176
 177 /*
 178  * Attach to an ACPI thermal zone.
 179  */
 180 static int
 181 acpi_tz_attach(device_t dev)
 182 {
 183     struct acpi_tz_softc        *sc;
 184     struct acpi_softc           *acpi_sc;
 185     int                         error;
 186     char                        oidname[8];
 187     ACPI_LOCK_DECL;
 188
 189     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 190
 191     ACPI_LOCK;
 192
 193     sc = device_get_softc(dev);
 194     sc->tz_dev = dev;
 195     sc->tz_handle = acpi_get_handle(dev);
 196     sc->tz_requested = TZ_ACTIVE_NONE;
 197     sc->tz_tmp_updating = 0;
 198
 199     /*
 200      * Parse the current state of the thermal zone and build control
 201      * structures.
 202      */
 203     if ((error = acpi_tz_establish(sc)) != 0)
 204         goto out;
 205
 206     /*
 207      * Register for any Notify events sent to this zone.
 208      */
 209     AcpiInstallNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY,
 210                              acpi_tz_notify_handler, sc);
 211
 212     /*
 213      * Create our sysctl nodes.
 214      *
 215      * XXX we need a mechanism for adding nodes under ACPI.
 216      */
 217     if (device_get_unit(dev) == 0) {
 218         acpi_sc = acpi_device_get_parent_softc(dev);
 219         sysctl_ctx_init(&acpi_tz_sysctl_ctx);
 220         acpi_tz_sysctl_tree = SYSCTL_ADD_NODE(&acpi_tz_sysctl_ctx,
 221                               SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
 222                               OID_AUTO, "thermal", CTLFLAG_RD, 0, "");
 223         SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
 224                        SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
 225                        OID_AUTO, "min_runtime", CTLFLAG_RD | CTLFLAG_RW,
 226                        &acpi_tz_min_runtime, 0,
 227                        "minimum cooling run time in sec");
 228         SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
 229                        SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
 230                        OID_AUTO, "polling_rate", CTLFLAG_RD | CTLFLAG_RW,
 231                        &acpi_tz_polling_rate, 0, "monitor polling rate");
 232     }
 233     sysctl_ctx_init(&sc->tz_sysctl_ctx);
 234     ksprintf(oidname, "tz%d", device_get_unit(dev));
 235     sc->tz_sysctl_tree = SYSCTL_ADD_NODE(&sc->tz_sysctl_ctx,
 236                                          SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
 237                                          OID_AUTO, oidname, CTLFLAG_RD, 0, "");
 238     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 239                    OID_AUTO, "temperature", CTLFLAG_RD,
 240                    &sc->tz_temperature, 0, "current thermal zone temperature");
 241     SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 242                     OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW,
 243                     sc, 0, acpi_tz_active_sysctl, "I", "");
 244
 245     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 246                    OID_AUTO, "thermal_flags", CTLFLAG_RD,
 247                    &sc->tz_thflags, 0, "thermal zone flags");
 248     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 249                    OID_AUTO, "_PSV", CTLFLAG_RD,
 250                    &sc->tz_zone.psv, 0, "");
 251     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 252                    OID_AUTO, "_HOT", CTLFLAG_RD,
 253                    &sc->tz_zone.hot, 0, "");
 254     SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 255                    OID_AUTO, "_CRT", CTLFLAG_RD,
 256                    &sc->tz_zone.crt, 0, "");
 257     SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
 258                       OID_AUTO, "_ACx", CTLFLAG_RD, &sc->tz_zone.ac,
 259                       sizeof(sc->tz_zone.ac), "I", "");
 260
 261     /*
 262      * Register our power profile event handler, and flag it for a manual
 263      * invocation by our timeout.  We defer it like this so that the rest
 264      * of the subsystem has time to come up.
 265      */
 266     EVENTHANDLER_REGISTER(power_profile_change, acpi_tz_power_profile, sc, 0);
 267     sc->tz_flags |= TZ_FLAG_GETPROFILE;
 268
 269     /*
 270      * Don't bother evaluating/printing the temperature at this point;
 271      * on many systems it'll be bogus until the EC is running.
 272      */
 273
 274     /*
 275      * Create our thread; we only need one, it will service all of the
 276      * thermal zones.
 277      */
 278     if (acpi_tz_td == NULL) {
 279             error = kthread_create(acpi_tz_thread, NULL, &acpi_tz_td,
 280                                    RFHIGHPID, 0, "acpi_thermal");
 281             if (error != 0) {
 282                     device_printf(sc->tz_dev, "could not create thread - %d",
 283                                   error);
 284                     goto out;
 285             }
 286     }
 287
 288  out:
 289     ACPI_UNLOCK;
 290
 291     return_VALUE (error);
 292 }
 293
 294 /*
 295  * Parse the current state of this thermal zone and set up to use it.
 296  *
 297  * Note that we may have previous state, which will have to be discarded.
 298  */
 299 static int
 300 acpi_tz_establish(struct acpi_tz_softc *sc)
 301 {
 302     ACPI_OBJECT *obj;
 303     int         i;
 304     char        nbuf[8];
 305
 306     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 307
 308     ACPI_ASSERTLOCK;
 309
 310     /* Power everything off and erase any existing state. */
 311     acpi_tz_all_off(sc);
 312     for (i = 0; i < TZ_NUMLEVELS; i++)
 313         if (sc->tz_zone.al[i].Pointer != NULL)
 314             AcpiOsFree(sc->tz_zone.al[i].Pointer);
 315     if (sc->tz_zone.psl.Pointer != NULL)
 316         AcpiOsFree(sc->tz_zone.psl.Pointer);
 317     bzero(&sc->tz_zone, sizeof(sc->tz_zone));
 318
 319     /* Evaluate thermal zone parameters. */
 320     for (i = 0; i < TZ_NUMLEVELS; i++) {
 321         ksprintf(nbuf, "_AC%d", i);
 322         acpi_tz_getparam(sc, nbuf, &sc->tz_zone.ac[i]);
 323         ksprintf(nbuf, "_AL%d", i);
 324         sc->tz_zone.al[i].Length = ACPI_ALLOCATE_BUFFER;
 325         sc->tz_zone.al[i].Pointer = NULL;
 326         AcpiEvaluateObject(sc->tz_handle, nbuf, NULL, &sc->tz_zone.al[i]);
 327         obj = (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer;
 328         if (obj != NULL) {
 329             /* Should be a package containing a list of power objects */
 330             if (obj->Type != ACPI_TYPE_PACKAGE) {
 331                 device_printf(sc->tz_dev, "%s has unknown type %d, rejecting\n",
 332                               nbuf, obj->Type);
 333                 return_VALUE (ENXIO);
 334             }
 335         }
 336     }
 337     acpi_tz_getparam(sc, "_CRT", &sc->tz_zone.crt);
 338     acpi_tz_getparam(sc, "_HOT", &sc->tz_zone.hot);
 339     sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER;
 340     sc->tz_zone.psl.Pointer = NULL;
 341     AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl);
 342     acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv);
 343     acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1);
 344     acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2);
 345     acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp);
 346     acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp);
 347
 348     /*
 349      * Sanity-check the values we've been given.
 350      *
 351      * XXX what do we do about systems that give us the same value for
 352      *     more than one of these setpoints?
 353      */
 354     acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT");
 355     acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT");
 356     acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV");
 357     for (i = 0; i < TZ_NUMLEVELS; i++)
 358         acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx");
 359
 360     /*
 361      * Power off everything that we've just been given.
 362      */
 363     acpi_tz_all_off(sc);
 364
 365     return_VALUE (0);
 366 }
 367
 368 static char     *aclevel_string[] =     {
 369         "NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4",
 370         "_AC5", "_AC6", "_AC7", "_AC8", "_AC9" };
 371
 372 static __inline const char *
 373 acpi_tz_aclevel_string(int active)
 374 {
 375         if (active < -1 || active >= TZ_NUMLEVELS)
 376                 return (aclevel_string[0]);
 377
 378         return (aclevel_string[active+1]);
 379 }
 380
 381 /*
 382  * Evaluate the condition of a thermal zone, take appropriate actions.
 383  */
 384 static void
 385 acpi_tz_monitor(void *Context)
 386 {
 387     struct acpi_tz_softc *sc;
 388     struct      timespec curtime;
 389     int         temp;
 390     int         i;
 391     int         newactive, newflags;
 392     ACPI_STATUS status;
 393
 394     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 395
 396     ACPI_ASSERTLOCK;
 397
 398     sc = (struct acpi_tz_softc *)Context;
 399     if (sc->tz_tmp_updating)
 400         goto out;
 401     sc->tz_tmp_updating = 1;
 402
 403     /* Get the current temperature. */
 404     status = acpi_GetInteger(sc->tz_handle, "_TMP", &temp);
 405     if (ACPI_FAILURE(status)) {
 406         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 407             "error fetching current temperature -- %s\n",
 408              AcpiFormatException(status));
 409         /* XXX disable zone? go to max cooling? */
 410         goto out;
 411     }
 412
 413     ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
 414     sc->tz_temperature = temp;
 415
 416     /*
 417      * Work out what we ought to be doing right now.
 418      *
 419      * Note that the _ACx levels sort from hot to cold.
 420      */
 421     newactive = TZ_ACTIVE_NONE;
 422     for (i = TZ_NUMLEVELS - 1; i >= 0; i--) {
 423         if ((sc->tz_zone.ac[i] != -1) && (temp >= sc->tz_zone.ac[i])) {
 424             newactive = i;
 425             if (sc->tz_active != newactive) {
 426                 ACPI_VPRINT(sc->tz_dev,
 427                             acpi_device_get_parent_softc(sc->tz_dev),
 428                             "_AC%d: temperature %d.%d >= setpoint %d.%d\n", i,
 429                             TZ_KELVTOC(temp), TZ_KELVTOC(sc->tz_zone.ac[i]));
 430                 getnanotime(&sc->tz_cooling_started);
 431             }
 432         }
 433     }
 434
 435     /*
 436      * We are going to get _ACx level down (colder side), but give a guaranteed
 437      * minimum cooling run time if requested.
 438      */
 439     if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE &&
 440         (newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) {
 441
 442         getnanotime(&curtime);
 443         timespecsub(&curtime, &sc->tz_cooling_started);
 444         if (curtime.tv_sec < acpi_tz_min_runtime)
 445             newactive = sc->tz_active;
 446     }
 447
 448     /* Handle user override of active mode */
 449     if (sc->tz_requested != TZ_ACTIVE_NONE && sc->tz_requested < newactive)
 450         newactive = sc->tz_requested;
 451
 452     /* update temperature-related flags */
 453     newflags = TZ_THFLAG_NONE;
 454     if (sc->tz_zone.psv != -1 && temp >= sc->tz_zone.psv)
 455         newflags |= TZ_THFLAG_PSV;
 456     if (sc->tz_zone.hot != -1 && temp >= sc->tz_zone.hot)
 457         newflags |= TZ_THFLAG_HOT;
 458     if (sc->tz_zone.crt != -1 && temp >= sc->tz_zone.crt)
 459         newflags |= TZ_THFLAG_CRT;
 460
 461     /* If the active cooling state has changed, we have to switch things. */
 462     if (newactive != sc->tz_active) {
 463         /* Turn off the cooling devices that are on, if any are */
 464         if (sc->tz_active != TZ_ACTIVE_NONE)
 465             acpi_ForeachPackageObject(
 466                 (ACPI_OBJECT *)sc->tz_zone.al[sc->tz_active].Pointer,
 467                 acpi_tz_switch_cooler_off, sc);
 468
 469         /* Turn on cooling devices that are required, if any are */
 470         if (newactive != TZ_ACTIVE_NONE) {
 471             acpi_ForeachPackageObject(
 472                 (ACPI_OBJECT *)sc->tz_zone.al[newactive].Pointer,
 473                 acpi_tz_switch_cooler_on, sc);
 474         }
 475         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 476                     "switched from %s to %s: %d.%dC\n",
 477                     acpi_tz_aclevel_string(sc->tz_active),
 478                     acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp));
 479         sc->tz_active = newactive;
 480     }
 481
 482     /* XXX (de)activate any passive cooling that may be required. */
 483
 484     /*
 485      * If the temperature is at _HOT or _CRT, increment our event count.
 486      * If it has occurred enough times, shutdown the system.  This is
 487      * needed because some systems will report an invalid high temperature
 488      * for one poll cycle.  It is suspected this is due to the embedded
 489      * controller timing out.  A typical value is 138C for one cycle on
 490      * a system that is otherwise 65C.
 491      *
 492      * If we're almost at that threshold, notify the user through devd(8).
 493      */
 494     if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) != 0) {
 495         sc->tz_validchecks++;
 496         if (sc->tz_validchecks == TZ_VALIDCHECKS) {
 497             device_printf(sc->tz_dev,
 498                 "WARNING - current temperature (%d.%dC) exceeds safe limits\n",
 499                 TZ_KELVTOC(sc->tz_temperature));
 500             shutdown_nice(RB_POWEROFF);
 501         } else if (sc->tz_validchecks == TZ_NOTIFYCOUNT)
 502             acpi_UserNotify("Thermal", sc->tz_handle, TZ_NOTIFY_CRITICAL);
 503     } else {
 504         sc->tz_validchecks = 0;
 505     }
 506     sc->tz_thflags = newflags;
 507
 508 out:
 509     sc->tz_tmp_updating = 0;
 510     return_VOID;
 511 }
 512
 513 /*
 514  * Turn off all the cooling devices.
 515  */
 516 static void
 517 acpi_tz_all_off(struct acpi_tz_softc *sc)
 518 {
 519     int         i;
 520
 521     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 522
 523     ACPI_ASSERTLOCK;
 524
 525     /* Scan all the _ALx objects and turn them all off. */
 526     for (i = 0; i < TZ_NUMLEVELS; i++) {
 527         if (sc->tz_zone.al[i].Pointer == NULL)
 528             continue;
 529         acpi_ForeachPackageObject((ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
 530                                   acpi_tz_switch_cooler_off, sc);
 531     }
 532
 533     /*
 534      * XXX revert any passive-cooling options.
 535      */
 536
 537     sc->tz_active = TZ_ACTIVE_NONE;
 538     sc->tz_thflags = TZ_THFLAG_NONE;
 539
 540     return_VOID;
 541 }
 542
 543 /*
 544  * Given an object, verify that it's a reference to a device of some sort,
 545  * and try to switch it off.
 546  */
 547 static void
 548 acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg)
 549 {
 550     ACPI_HANDLE                 cooler;
 551
 552     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 553
 554     ACPI_ASSERTLOCK;
 555
 556     cooler = acpi_GetReference(NULL, obj);
 557     if (cooler == NULL) {
 558         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
 559         return_VOID;
 560     }
 561
 562     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n",
 563                      acpi_name(cooler)));
 564     acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3);
 565
 566     return_VOID;
 567 }
 568
 569 /*
 570  * Given an object, verify that it's a reference to a device of some sort,
 571  * and try to switch it on.
 572  *
 573  * XXX replication of off/on function code is bad.
 574  */
 575 static void
 576 acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg)
 577 {
 578     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)arg;
 579     ACPI_HANDLE                 cooler;
 580     ACPI_STATUS                 status;
 581
 582     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 583
 584     ACPI_ASSERTLOCK;
 585
 586     cooler = acpi_GetReference(NULL, obj);
 587     if (cooler == NULL) {
 588         ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get handle\n"));
 589         return_VOID;
 590     }
 591
 592     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n",
 593                      acpi_name(cooler)));
 594     status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0);
 595     if (ACPI_FAILURE(status)) {
 596         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 597                     "failed to activate %s - %s\n", acpi_name(cooler),
 598                     AcpiFormatException(status));
 599     }
 600
 601     return_VOID;
 602 }
 603
 604 /*
 605  * Read/debug-print a parameter, default it to -1.
 606  */
 607 static void
 608 acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data)
 609 {
 610
 611     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 612
 613     ACPI_ASSERTLOCK;
 614
 615     if (ACPI_FAILURE(acpi_GetInteger(sc->tz_handle, node, data))) {
 616         *data = -1;
 617     } else {
 618         ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n",
 619                          acpi_name(sc->tz_handle), node, *data));
 620     }
 621
 622     return_VOID;
 623 }
 624
 625 /*
 626  * Sanity-check a temperature value.  Assume that setpoints
 627  * should be between 0C and 150C.
 628  */
 629 static void
 630 acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what)
 631 {
 632     if (*val != -1 && (*val < TZ_ZEROC || *val > TZ_ZEROC + 1500)) {
 633         device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n",
 634                       what, TZ_KELVTOC(*val));
 635         *val = -1;
 636     }
 637 }
 638
 639 /*
 640  * Respond to a sysctl on the active state node.
 641  */
 642 static int
 643 acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
 644 {
 645     struct acpi_tz_softc        *sc;
 646     int                         active;
 647     int                         error;
 648     ACPI_LOCK_DECL;
 649
 650     ACPI_LOCK;
 651
 652     sc = (struct acpi_tz_softc *)oidp->oid_arg1;
 653     active = sc->tz_active;
 654     error = sysctl_handle_int(oidp, &active, 0, req);
 655
 656     /* Error or no new value */
 657     if (error != 0 || req->newptr == NULL)
 658         goto out;
 659     if (active < -1 || active >= TZ_NUMLEVELS) {
 660         error = EINVAL;
 661         goto out;
 662     }
 663
 664     /* Set new preferred level and re-switch */
 665     sc->tz_requested = active;
 666     acpi_tz_monitor(sc);
 667
 668  out:
 669     ACPI_UNLOCK;
 670     return (error);
 671 }
 672
 673 /*
 674  * Respond to a Notify event sent to the zone.
 675  */
 676 static void
 677 acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
 678 {
 679     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)context;
 680
 681     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 682
 683     ACPI_ASSERTLOCK;
 684
 685     switch(notify) {
 686     case TZ_NOTIFY_TEMPERATURE:
 687         /* Temperature change occurred */
 688         AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_tz_monitor, sc);
 689         break;
 690     case TZ_NOTIFY_DEVICES:
 691     case TZ_NOTIFY_LEVELS:
 692         /* Zone devices/setpoints changed */
 693         AcpiOsExecute(OSL_NOTIFY_HANDLER,
 694                                 (ACPI_OSD_EXEC_CALLBACK)acpi_tz_establish, sc);
 695         break;
 696     default:
 697         ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
 698                     "unknown Notify event 0x%x\n", notify);
 699         break;
 700     }
 701
 702     acpi_UserNotify("Thermal", h, notify);
 703
 704     return_VOID;
 705 }
 706
 707 /*
 708  * Poll the thermal zone.
 709  */
 710 static void
 711 acpi_tz_timeout(struct acpi_tz_softc *sc)
 712 {
 713     /* Do we need to get the power profile settings? */
 714     if (sc->tz_flags & TZ_FLAG_GETPROFILE) {
 715         acpi_tz_power_profile((void *)sc);
 716         sc->tz_flags &= ~TZ_FLAG_GETPROFILE;
 717     }
 718
 719     ACPI_ASSERTLOCK;
 720
 721     /* Check the current temperature and take action based on it */
 722     acpi_tz_monitor(sc);
 723
 724     /* XXX passive cooling actions? */
 725 }
 726
 727 /*
 728  * System power profile may have changed; fetch and notify the
 729  * thermal zone accordingly.
 730  *
 731  * Since this can be called from an arbitrary eventhandler, it needs
 732  * to get the ACPI lock itself.
 733  */
 734 static void
 735 acpi_tz_power_profile(void *arg)
 736 {
 737     ACPI_STATUS                 status;
 738     struct acpi_tz_softc        *sc = (struct acpi_tz_softc *)arg;
 739     int                         state;
 740     ACPI_LOCK_DECL;
 741
 742     state = power_profile_get_state();
 743     if (state != POWER_PROFILE_PERFORMANCE && state != POWER_PROFILE_ECONOMY)
 744         return;
 745
 746     ACPI_LOCK;
 747
 748     /* check that we haven't decided there's no _SCP method */
 749     if ((sc->tz_flags & TZ_FLAG_NO_SCP) == 0) {
 750
 751         /* Call _SCP to set the new profile */
 752         status = acpi_SetInteger(sc->tz_handle, "_SCP",
 753             (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1);
 754         if (ACPI_FAILURE(status)) {
 755             if (status != AE_NOT_FOUND)
 756                 ACPI_VPRINT(sc->tz_dev,
 757                             acpi_device_get_parent_softc(sc->tz_dev),
 758                             "can't evaluate %s._SCP - %s\n",
 759                             acpi_name(sc->tz_handle),
 760                             AcpiFormatException(status));
 761             sc->tz_flags |= TZ_FLAG_NO_SCP;
 762         } else {
 763             /* We have to re-evaluate the entire zone now */
 764             AcpiOsExecute(OSL_NOTIFY_HANDLER,
 765                                     (ACPI_OSD_EXEC_CALLBACK)acpi_tz_establish,
 766                                     sc);
 767         }
 768     }
 769
 770     ACPI_UNLOCK;
 771 }
 772
 773 /*
 774  * Thermal zone monitor thread.
 775  */
 776 static void
 777 acpi_tz_thread(void *arg)
 778 {
 779     device_t    *devs;
 780     int         devcount, i;
 781     ACPI_LOCK_DECL;
 782
 783     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 784
 785     devs = NULL;
 786     devcount = 0;
 787
 788     for (;;) {
 789         tsleep(&acpi_tz_td, 0, "tzpoll", hz * acpi_tz_polling_rate);
 790
 791 #if __FreeBSD_version >= 500000
 792         mtx_lock(&Giant);
 793 #endif
 794
 795         if (devcount == 0)
 796             devclass_get_devices(acpi_tz_devclass, &devs, &devcount);
 797
 798         ACPI_LOCK;
 799         for (i = 0; i < devcount; i++)
 800             acpi_tz_timeout(device_get_softc(devs[i]));
 801         ACPI_UNLOCK;
 802
 803 #if __FreeBSD_version >= 500000
 804         mtx_unlock(&Giant);
 805 #endif
 806     }
 807 }