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freebsd/sys/dev/acpica/acpi_thermal.c
2002-05-25 11:18:03 +00:00

806 lines
23 KiB
C

/*-
* Copyright (c) 2000, 2001 Michael Smith
* Copyright (c) 2000 BSDi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/bus.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
#include <sys/power.h>
#include "acpi.h"
#include <dev/acpica/acpivar.h>
/*
* Hooks for the ACPI CA debugging infrastructure
*/
#define _COMPONENT ACPI_THERMAL
ACPI_MODULE_NAME("THERMAL")
#define TZ_ZEROC 2732
#define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), (((x) - TZ_ZEROC) % 10)
#define TZ_NOTIFY_TEMPERATURE 0x80
#define TZ_NOTIFY_DEVICES 0x81
#define TZ_NOTIFY_LEVELS 0x82
#define TZ_POLLRATE 30 /* every 30 seconds by default */
#define TZ_NUMLEVELS 10 /* defined by ACPI spec */
struct acpi_tz_zone {
int ac[TZ_NUMLEVELS];
ACPI_BUFFER al[TZ_NUMLEVELS];
int crt;
int hot;
ACPI_BUFFER psl;
int psv;
int tc1;
int tc2;
int tsp;
int tzp;
};
struct acpi_tz_softc {
device_t tz_dev; /* device handle */
ACPI_HANDLE tz_handle; /* thermal zone handle */
int tz_temperature; /* current temperature */
int tz_active; /* current active cooling */
#define TZ_ACTIVE_NONE -1
int tz_requested; /* user-requested minimum active cooling */
int tz_thflags; /* current temperature-related flags */
#define TZ_THFLAG_NONE 0
#define TZ_THFLAG_PSV (1<<0)
#define TZ_THFLAG_HOT (1<<2)
#define TZ_THFLAG_CRT (1<<3)
int tz_flags;
#define TZ_FLAG_NO_SCP (1<<0) /* no _SCP method */
#define TZ_FLAG_GETPROFILE (1<<1) /* fetch power_profile in timeout */
struct timespec tz_cooling_started; /* current cooling starting time */
struct sysctl_ctx_list tz_sysctl_ctx; /* sysctl tree */
struct sysctl_oid *tz_sysctl_tree;
struct acpi_tz_zone tz_zone; /* thermal zone parameters */
int tz_tmp_updating;
};
static int acpi_tz_probe(device_t dev);
static int acpi_tz_attach(device_t dev);
static int acpi_tz_establish(struct acpi_tz_softc *sc);
static void acpi_tz_monitor(struct acpi_tz_softc *sc);
static void acpi_tz_all_off(struct acpi_tz_softc *sc);
static void acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg);
static void acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg);
static void acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data);
static void acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what);
static int acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS);
static void acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context);
static void acpi_tz_timeout(struct acpi_tz_softc *sc);
static void acpi_tz_power_profile(void *arg);
static void acpi_tz_thread(void *arg);
static struct proc *acpi_tz_proc;
static device_method_t acpi_tz_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, acpi_tz_probe),
DEVMETHOD(device_attach, acpi_tz_attach),
{0, 0}
};
static driver_t acpi_tz_driver = {
"acpi_tz",
acpi_tz_methods,
sizeof(struct acpi_tz_softc),
};
static devclass_t acpi_tz_devclass;
DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0);
static struct sysctl_ctx_list acpi_tz_sysctl_ctx;
static struct sysctl_oid *acpi_tz_sysctl_tree;
static int acpi_tz_min_runtime = 0;/* minimum cooling run time */
static int acpi_tz_polling_rate = TZ_POLLRATE;
/*
* Match an ACPI thermal zone.
*/
static int
acpi_tz_probe(device_t dev)
{
int result;
ACPI_LOCK;
/* no FUNCTION_TRACE - too noisy */
if ((acpi_get_type(dev) == ACPI_TYPE_THERMAL) &&
!acpi_disabled("thermal")) {
device_set_desc(dev, "thermal zone");
result = -10;
} else {
result = ENXIO;
}
ACPI_UNLOCK;
return(result);
}
/*
* Attach to an ACPI thermal zone.
*/
static int
acpi_tz_attach(device_t dev)
{
struct acpi_tz_softc *sc;
struct acpi_softc *acpi_sc;
int error;
char oidname[8];
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_LOCK;
sc = device_get_softc(dev);
sc->tz_dev = dev;
sc->tz_handle = acpi_get_handle(dev);
sc->tz_requested = TZ_ACTIVE_NONE;
sc->tz_tmp_updating = 0;
/*
* Parse the current state of the thermal zone and build control
* structures.
*/
if ((error = acpi_tz_establish(sc)) != 0)
goto out;
/*
* Register for any Notify events sent to this zone.
*/
AcpiInstallNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY,
acpi_tz_notify_handler, sc);
/*
* Create our sysctl nodes.
*
* XXX we need a mechanism for adding nodes under ACPI.
*/
if (device_get_unit(dev) == 0) {
acpi_sc = acpi_device_get_parent_softc(dev);
sysctl_ctx_init(&acpi_tz_sysctl_ctx);
acpi_tz_sysctl_tree = SYSCTL_ADD_NODE(&acpi_tz_sysctl_ctx,
SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
OID_AUTO, "thermal", CTLFLAG_RD, 0, "");
SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
OID_AUTO, "min_runtime", CTLFLAG_RD | CTLFLAG_RW,
&acpi_tz_min_runtime, 0, "minimum cooling run time in sec");
SYSCTL_ADD_INT(&acpi_tz_sysctl_ctx,
SYSCTL_CHILDREN(acpi_tz_sysctl_tree),
OID_AUTO, "polling_rate", CTLFLAG_RD | CTLFLAG_RW,
&acpi_tz_polling_rate, 0, "monitor polling rate");
}
sysctl_ctx_init(&sc->tz_sysctl_ctx);
sprintf(oidname, "tz%d", device_get_unit(dev));
sc->tz_sysctl_tree = SYSCTL_ADD_NODE(&sc->tz_sysctl_ctx,
SYSCTL_CHILDREN(acpi_tz_sysctl_tree), OID_AUTO,
oidname, CTLFLAG_RD, 0, "");
SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "temperature", CTLFLAG_RD,
&sc->tz_temperature, 0, "current thermal zone temperature");
SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW,
sc, 0, acpi_tz_active_sysctl, "I", "");
SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "thermal_flags", CTLFLAG_RD,
&sc->tz_thflags, 0, "thermal zone flags");
SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "_PSV", CTLFLAG_RD,
&sc->tz_zone.psv, 0, "");
SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "_HOT", CTLFLAG_RD,
&sc->tz_zone.hot, 0, "");
SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "_CRT", CTLFLAG_RD,
&sc->tz_zone.crt, 0, "");
SYSCTL_ADD_OPAQUE(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "_ACx", CTLFLAG_RD, &sc->tz_zone.ac,
sizeof(sc->tz_zone.ac), "I", "");
/*
* Register our power profile event handler, and flag it for a manual
* invocation by our timeout. We defer it like this so that the rest
* of the subsystem has time to come up.
*/
EVENTHANDLER_REGISTER(power_profile_change, acpi_tz_power_profile, sc, 0);
sc->tz_flags |= TZ_FLAG_GETPROFILE;
/*
* Don't bother evaluating/printing the temperature at this point;
* on many systems it'll be bogus until the EC is running.
*/
/*
* Create our thread; we only need one, it will service all of the
* thermal zones.
*/
if (acpi_tz_proc == NULL) {
error = kthread_create(acpi_tz_thread, NULL, &acpi_tz_proc,
RFHIGHPID, "acpi_thermal");
if (error != 0) {
device_printf(sc->tz_dev, "could not create thread - %d", error);
goto out;
}
}
out:
ACPI_UNLOCK;
return_VALUE(error);
}
/*
* Parse the current state of this thermal zone and set up to use it.
*
* Note that we may have previous state, which will have to be discarded.
*/
static int
acpi_tz_establish(struct acpi_tz_softc *sc)
{
ACPI_OBJECT *obj;
int i;
char nbuf[8];
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
/*
* Power everything off and erase any existing state.
*/
acpi_tz_all_off(sc);
for (i = 0; i < TZ_NUMLEVELS; i++)
if (sc->tz_zone.al[i].Pointer != NULL)
AcpiOsFree(sc->tz_zone.al[i].Pointer);
if (sc->tz_zone.psl.Pointer != NULL)
AcpiOsFree(sc->tz_zone.psl.Pointer);
bzero(&sc->tz_zone, sizeof(sc->tz_zone));
/*
* Evaluate thermal zone parameters.
*/
for (i = 0; i < TZ_NUMLEVELS; i++) {
sprintf(nbuf, "_AC%d", i);
acpi_tz_getparam(sc, nbuf, &sc->tz_zone.ac[i]);
sprintf(nbuf, "_AL%d", i);
sc->tz_zone.al[i].Length = ACPI_ALLOCATE_BUFFER;
sc->tz_zone.al[i].Pointer = NULL;
AcpiEvaluateObject(sc->tz_handle, nbuf, NULL, &sc->tz_zone.al[i]);
obj = (ACPI_OBJECT *)sc->tz_zone.al[i].Pointer;
if (obj != NULL) {
/* should be a package containing a list of power objects */
if (obj->Type != ACPI_TYPE_PACKAGE) {
device_printf(sc->tz_dev, "%s has unknown object type %d, rejecting\n",
nbuf, obj->Type);
return_VALUE(ENXIO);
}
}
}
acpi_tz_getparam(sc, "_CRT", &sc->tz_zone.crt);
acpi_tz_getparam(sc, "_HOT", &sc->tz_zone.hot);
sc->tz_zone.psl.Length = ACPI_ALLOCATE_BUFFER;
sc->tz_zone.psl.Pointer = NULL;
AcpiEvaluateObject(sc->tz_handle, "_PSL", NULL, &sc->tz_zone.psl);
acpi_tz_getparam(sc, "_PSV", &sc->tz_zone.psv);
acpi_tz_getparam(sc, "_TC1", &sc->tz_zone.tc1);
acpi_tz_getparam(sc, "_TC2", &sc->tz_zone.tc2);
acpi_tz_getparam(sc, "_TSP", &sc->tz_zone.tsp);
acpi_tz_getparam(sc, "_TZP", &sc->tz_zone.tzp);
/*
* Sanity-check the values we've been given.
*
* XXX what do we do about systems that give us the same value for
* more than one of these setpoints?
*/
acpi_tz_sanity(sc, &sc->tz_zone.crt, "_CRT");
acpi_tz_sanity(sc, &sc->tz_zone.hot, "_HOT");
acpi_tz_sanity(sc, &sc->tz_zone.psv, "_PSV");
for (i = 0; i < TZ_NUMLEVELS; i++)
acpi_tz_sanity(sc, &sc->tz_zone.ac[i], "_ACx");
/*
* Power off everything that we've just been given.
*/
acpi_tz_all_off(sc);
return_VALUE(0);
}
static char *aclevel_string[] = {
"NONE", "_AC0", "_AC1", "_AC2", "_AC3", "_AC4",
"_AC5", "_AC6", "_AC7", "_AC8", "_AC9" };
static __inline const char *
acpi_tz_aclevel_string(int active)
{
if (active < -1 || active >= TZ_NUMLEVELS) {
return (aclevel_string[0]);
}
return (aclevel_string[active+1]);
}
/*
* Evaluate the condition of a thermal zone, take appropriate actions.
*/
static void
acpi_tz_monitor(struct acpi_tz_softc *sc)
{
int temp;
int i;
int newactive, newflags;
struct timespec curtime;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
if (sc->tz_tmp_updating) {
goto out;
}
sc->tz_tmp_updating = 1;
/*
* Get the current temperature.
*/
if (ACPI_FAILURE(status = acpi_EvaluateInteger(sc->tz_handle, "_TMP", &temp))) {
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"error fetching current temperature -- %s\n",
AcpiFormatException(status));
/* XXX disable zone? go to max cooling? */
goto out;
}
ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
sc->tz_temperature = temp;
/*
* Work out what we ought to be doing right now.
*
* Note that the _ACx levels sort from hot to cold.
*/
newactive = TZ_ACTIVE_NONE;
for (i = TZ_NUMLEVELS - 1; i >= 0; i--) {
if ((sc->tz_zone.ac[i] != -1) && (temp >= sc->tz_zone.ac[i])) {
newactive = i;
if (sc->tz_active != newactive) {
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"_AC%d: temperature %d.%d >= setpoint %d.%d\n", i,
TZ_KELVTOC(temp), TZ_KELVTOC(sc->tz_zone.ac[i]));
getnanotime(&sc->tz_cooling_started);
}
}
}
/*
* We are going to get _ACx level down (colder side), but give a guaranteed
* minimum cooling run time if requested.
*/
if (acpi_tz_min_runtime > 0 && sc->tz_active != TZ_ACTIVE_NONE &&
(newactive == TZ_ACTIVE_NONE || newactive > sc->tz_active)) {
getnanotime(&curtime);
timespecsub(&curtime, &sc->tz_cooling_started);
if (curtime.tv_sec < acpi_tz_min_runtime) {
newactive = sc->tz_active;
}
}
/* handle user override of active mode */
if (sc->tz_requested > newactive)
newactive = sc->tz_requested;
/* update temperature-related flags */
newflags = TZ_THFLAG_NONE;
if ((sc->tz_zone.psv != -1) && (temp >= sc->tz_zone.psv))
newflags |= TZ_THFLAG_PSV;
if ((sc->tz_zone.hot != -1) && (temp >= sc->tz_zone.hot))
newflags |= TZ_THFLAG_HOT;
if ((sc->tz_zone.crt != -1) && (temp >= sc->tz_zone.crt))
newflags |= TZ_THFLAG_CRT;
/*
* If the active cooling state has changed, we have to switch things.
*/
if (newactive != sc->tz_active) {
/* turn off the cooling devices that are on, if any are */
if (sc->tz_active != TZ_ACTIVE_NONE)
acpi_ForeachPackageObject((ACPI_OBJECT *)sc->tz_zone.al[sc->tz_active].Pointer,
acpi_tz_switch_cooler_off, sc);
/* turn on cooling devices that are required, if any are */
if (newactive != TZ_ACTIVE_NONE)
acpi_ForeachPackageObject((ACPI_OBJECT *)sc->tz_zone.al[newactive].Pointer,
acpi_tz_switch_cooler_on, sc);
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"switched from %s to %s: %d.%dC\n",
acpi_tz_aclevel_string(sc->tz_active),
acpi_tz_aclevel_string(newactive), TZ_KELVTOC(temp));
sc->tz_active = newactive;
}
/*
* XXX (de)activate any passive cooling that may be required.
*/
/*
* If we have just become _HOT or _CRT, warn the user.
*
* We should actually shut down at this point, but it's not clear
* that some systems don't actually map _CRT to the same value as _AC0.
*/
if ((newflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT)) &&
!(sc->tz_thflags & (TZ_THFLAG_HOT | TZ_THFLAG_CRT))) {
device_printf(sc->tz_dev, "WARNING - current temperature (%d.%dC) exceeds system limits\n",
TZ_KELVTOC(sc->tz_temperature));
/* shutdown_nice(RB_POWEROFF);*/
}
sc->tz_thflags = newflags;
out:
sc->tz_tmp_updating = 0;
return_VOID;
}
/*
* Turn off all the cooling devices.
*/
static void
acpi_tz_all_off(struct acpi_tz_softc *sc)
{
int i;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
/*
* Scan all the _ALx objects, and turn them all off.
*/
for (i = 0; i < TZ_NUMLEVELS; i++) {
if (sc->tz_zone.al[i].Pointer == NULL)
continue;
acpi_ForeachPackageObject((ACPI_OBJECT *)sc->tz_zone.al[i].Pointer,
acpi_tz_switch_cooler_off, sc);
}
/*
* XXX revert any passive-cooling options.
*/
sc->tz_active = TZ_ACTIVE_NONE;
sc->tz_thflags = TZ_THFLAG_NONE;
return_VOID;
}
/*
* Given an object, verify that it's a reference to a device of some sort,
* and try to switch it off.
*/
static void
acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg)
{
ACPI_HANDLE cooler;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
switch(obj->Type) {
case ACPI_TYPE_STRING:
ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s off\n", obj->String.Pointer));
/*
* Find the handle for the device and turn it off.
* The String object here seems to contain a fully-qualified path, so we
* don't have to search for it in our parents.
*
* XXX This may not always be the case.
*/
if (ACPI_SUCCESS(AcpiGetHandle(NULL, obj->String.Pointer, &cooler)))
acpi_pwr_switch_consumer(cooler, ACPI_STATE_D3);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to handle unsupported object type %d\n",
obj->Type));
break;
}
return_VOID;
}
/*
* Given an object, verify that it's a reference to a device of some sort,
* and try to switch it on.
*
* XXX replication of off/on function code is bad, mmmkay?
*/
static void
acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg)
{
struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
ACPI_HANDLE cooler;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
switch(obj->Type) {
case ACPI_TYPE_STRING:
ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to turn %s on\n", obj->String.Pointer));
/*
* Find the handle for the device and turn it off.
* The String object here seems to contain a fully-qualified path, so we
* don't have to search for it in our parents.
*
* XXX This may not always be the case.
*/
if (ACPI_SUCCESS(AcpiGetHandle(NULL, obj->String.Pointer, &cooler))) {
if (ACPI_FAILURE(status = acpi_pwr_switch_consumer(cooler, ACPI_STATE_D0))) {
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"failed to activate %s - %s\n",
obj->String.Pointer, AcpiFormatException(status));
}
} else {
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"couldn't find %s\n", obj->String.Pointer);
}
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "called to handle unsupported object type %d\n",
obj->Type));
break;
}
return_VOID;
}
/*
* Read/debug-print a parameter, default it to -1.
*/
static void
acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data)
{
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
if (ACPI_FAILURE(acpi_EvaluateInteger(sc->tz_handle, node, data))) {
*data = -1;
} else {
ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "%s.%s = %d\n", acpi_name(sc->tz_handle),
node, *data));
}
return_VOID;
}
/*
* Sanity-check a temperature value. Assume that setpoints
* should be between 0C and 150C.
*/
static void
acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what)
{
if ((*val != -1) && ((*val < TZ_ZEROC) || (*val > (TZ_ZEROC + 1500)))) {
device_printf(sc->tz_dev, "%s value is absurd, ignored (%d.%dC)\n",
what, TZ_KELVTOC(*val));
*val = -1;
}
}
/*
* Respond to a sysctl on the active state node.
*/
static int
acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
{
struct acpi_tz_softc *sc;
int active;
int error;
ACPI_LOCK;
sc = (struct acpi_tz_softc *)oidp->oid_arg1;
active = sc->tz_active;
error = sysctl_handle_int(oidp, &active, 0, req);
/* error or no new value */
if ((error != 0) || (req->newptr == NULL))
goto out;
/* range check */
if ((active < -1) || (active >= TZ_NUMLEVELS)) {
error = EINVAL;
goto out;
}
/* set new preferred level and re-switch */
sc->tz_requested = active;
acpi_tz_monitor(sc);
out:
ACPI_UNLOCK;
return(error);
}
/*
* Respond to a Notify event sent to the zone.
*/
static void
acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
{
struct acpi_tz_softc *sc = (struct acpi_tz_softc *)context;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_ASSERTLOCK;
switch(notify) {
case TZ_NOTIFY_TEMPERATURE:
/* temperature change occurred */
AcpiOsQueueForExecution(OSD_PRIORITY_HIGH, (OSD_EXECUTION_CALLBACK)acpi_tz_monitor, sc);
break;
case TZ_NOTIFY_DEVICES:
case TZ_NOTIFY_LEVELS:
/* zone devices/setpoints changed */
AcpiOsQueueForExecution(OSD_PRIORITY_HIGH, (OSD_EXECUTION_CALLBACK)acpi_tz_establish, sc);
break;
default:
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"unknown Notify event 0x%x\n", notify);
break;
}
return_VOID;
}
/*
* Poll the thermal zone.
*/
static void
acpi_tz_timeout(struct acpi_tz_softc *sc)
{
/* do we need to get the power profile settings? */
if (sc->tz_flags & TZ_FLAG_GETPROFILE) {
acpi_tz_power_profile((void *)sc);
sc->tz_flags &= ~TZ_FLAG_GETPROFILE;
}
ACPI_ASSERTLOCK;
/* check the current temperature and take action based on it */
acpi_tz_monitor(sc);
/* XXX passive cooling actions? */
}
/*
* System power profile may have changed; fetch and notify the
* thermal zone accordingly.
*
* Since this can be called from an arbitrary eventhandler, it needs
* to get the ACPI lock itself.
*/
static void
acpi_tz_power_profile(void *arg)
{
ACPI_OBJECT_LIST args;
ACPI_OBJECT obj;
ACPI_STATUS status;
struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
int state;
state = power_profile_get_state();
if (state != POWER_PROFILE_PERFORMANCE &&
state != POWER_PROFILE_ECONOMY) {
return;
}
ACPI_LOCK;
/* check that we haven't decided there's no _SCP method */
if (!(sc->tz_flags & TZ_FLAG_NO_SCP)) {
/* call _SCP to set the new profile */
obj.Type = ACPI_TYPE_INTEGER;
obj.Integer.Value = (state == POWER_PROFILE_PERFORMANCE) ? 0 : 1;
args.Count = 1;
args.Pointer = &obj;
if (ACPI_FAILURE(status = AcpiEvaluateObject(sc->tz_handle, "_SCP", &args, NULL))) {
if (status != AE_NOT_FOUND)
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"can't evaluate %s._SCP - %s\n", acpi_name(sc->tz_handle),
AcpiFormatException(status));
sc->tz_flags |= TZ_FLAG_NO_SCP;
} else {
/* we have to re-evaluate the entire zone now */
AcpiOsQueueForExecution(OSD_PRIORITY_HIGH, (OSD_EXECUTION_CALLBACK)acpi_tz_establish, sc);
}
}
ACPI_UNLOCK;
}
/*
* Thermal zone monitor thread.
*/
static void
acpi_tz_thread(void *arg)
{
device_t *devs;
int devcount, i;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
devs = NULL;
devcount = 0;
for (;;) {
tsleep(&acpi_tz_proc, PZERO, "nothing", hz * acpi_tz_polling_rate);
mtx_lock(&Giant);
if (devcount == 0)
devclass_get_devices(acpi_tz_devclass, &devs, &devcount);
ACPI_LOCK;
for (i = 0; i < devcount; i++)
acpi_tz_timeout(device_get_softc(devs[i]));
ACPI_UNLOCK;
mtx_unlock(&Giant);
}
}