// SPDX-License-Identifier: GPL-2.0-or-later
/*
* acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
*
* Copyright (C) 2001, 2002 Andy Grover <[email protected]>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
*
* This driver fully implements the ACPI thermal policy as described in the
* ACPI 2.0 Specification.
*
* TBD: 1. Implement passive cooling hysteresis.
* 2. Enhance passive cooling (CPU) states/limit interface to support
* concepts of 'multiple limiters', upper/lower limits, etc.
*/
#define pr_fmt(fmt) "ACPI: thermal: " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/kmod.h>
#include <linux/reboot.h>
#include <linux/device.h>
#include <linux/thermal.h>
#include <linux/acpi.h>
#include <linux/workqueue.h>
#include <linux/uaccess.h>
#include <linux/units.h>
#include "internal.h"
#define ACPI_THERMAL_CLASS "thermal_zone"
#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
#define ACPI_THERMAL_NOTIFY_HOT 0xF1
#define ACPI_THERMAL_MODE_ACTIVE 0x00
#define ACPI_THERMAL_MAX_ACTIVE 10
#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
#define ACPI_THERMAL_TRIP_PASSIVE (-1)
#define ACPI_THERMAL_MAX_NR_TRIPS (ACPI_THERMAL_MAX_ACTIVE + 3)
/*
* This exception is thrown out in two cases:
* 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
* when re-evaluating the AML code.
* 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
* We need to re-bind the cooling devices of a thermal zone when this occurs.
*/
#define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \
do { \
acpi_handle_info(tz->device->handle, \
"ACPI thermal trip point %s changed\n" \
"Please report to [email protected]\n", str); \
} while (0)
static int act;
module_param(act, int, 0644);
MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
static int crt;
module_param(crt, int, 0644);
MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
static int tzp;
module_param(tzp, int, 0444);
MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
static int off;
module_param(off, int, 0);
MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
static int psv;
module_param(psv, int, 0644);
MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
static struct workqueue_struct *acpi_thermal_pm_queue;
struct acpi_thermal_trip {
unsigned long temp_dk;
struct acpi_handle_list devices;
};
struct acpi_thermal_passive {
struct acpi_thermal_trip trip;
unsigned long tc1;
unsigned long tc2;
unsigned long delay;
};
struct acpi_thermal_active {
struct acpi_thermal_trip trip;
};
struct acpi_thermal_trips {
struct acpi_thermal_passive passive;
struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
};
struct acpi_thermal {
struct acpi_device *device;
acpi_bus_id name;
unsigned long temp_dk;
unsigned long last_temp_dk;
unsigned long polling_frequency;
volatile u8 zombie;
struct acpi_thermal_trips trips;
struct thermal_zone_device *thermal_zone;
int kelvin_offset; /* in millidegrees */
struct work_struct thermal_check_work;
struct mutex thermal_check_lock;
refcount_t thermal_check_count;
};
/* --------------------------------------------------------------------------
Thermal Zone Management
-------------------------------------------------------------------------- */
static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
{
acpi_status status = AE_OK;
unsigned long long tmp;
if (!tz)
return -EINVAL;
tz->last_temp_dk = tz->temp_dk;
status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
if (ACPI_FAILURE(status))
return -ENODEV;
tz->temp_dk = tmp;
acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
tz->temp_dk);
return 0;
}
static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
{
acpi_status status = AE_OK;
unsigned long long tmp;
if (!tz)
return -EINVAL;
status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
if (ACPI_FAILURE(status))
return -ENODEV;
tz->polling_frequency = tmp;
acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
tz->polling_frequency);
return 0;
}
static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
{
int temp;
if (temp_deci_k == THERMAL_TEMP_INVALID)
return THERMAL_TEMP_INVALID;
temp = deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
tz->kelvin_offset);
if (temp <= 0)
return THERMAL_TEMP_INVALID;
return temp;
}
static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
{
return acpi_trip->temp_dk != THERMAL_TEMP_INVALID;
}
static int active_trip_index(struct acpi_thermal *tz,
struct acpi_thermal_trip *acpi_trip)
{
struct acpi_thermal_active *active;
active = container_of(acpi_trip, struct acpi_thermal_active, trip);
return active - tz->trips.active;
}
static long get_passive_temp(struct acpi_thermal *tz)
{
int temp;
if (acpi_passive_trip_temp(tz->device, &temp))
return THERMAL_TEMP_INVALID;
return temp;
}
static long get_active_temp(struct acpi_thermal *tz, int index)
{
int temp;
if (acpi_active_trip_temp(tz->device, index, &temp))
return THERMAL_TEMP_INVALID;
/*
* If an override has been provided, apply it so there are no active
* trips with thresholds greater than the override.
*/
if (act > 0) {
unsigned long long override = celsius_to_deci_kelvin(act);
if (temp > override)
return override;
}
return temp;
}
static void acpi_thermal_update_trip(struct acpi_thermal *tz,
const struct thermal_trip *trip)
{
struct acpi_thermal_trip *acpi_trip = trip->priv;
if (trip->type == THERMAL_TRIP_PASSIVE) {
if (psv > 0)
return;
acpi_trip->temp_dk = get_passive_temp(tz);
} else {
int index = active_trip_index(tz, acpi_trip);
acpi_trip->temp_dk = get_active_temp(tz, index);
}
if (!acpi_thermal_trip_valid(acpi_trip))
ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
}
static bool update_trip_devices(struct acpi_thermal *tz,
struct acpi_thermal_trip *acpi_trip,
int index, bool compare)
{
struct acpi_handle_list devices = { 0 };
char method[] = "_PSL";
if (index != ACPI_THERMAL_TRIP_PASSIVE) {
method[1] = 'A';
method[2] = 'L';
method[3] = '0' + index;
}
if (!acpi_evaluate_reference(tz->device->handle, method, NULL, &devices)) {
acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
return false;
}
if (acpi_handle_list_equal(&acpi_trip->devices, &devices)) {
acpi_handle_list_free(&devices);
return true;
}
if (compare)
ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
acpi_handle_list_replace(&acpi_trip->devices, &devices);
return true;
}
static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz,
const struct thermal_trip *trip)
{
struct acpi_thermal_trip *acpi_trip = trip->priv;
int index = trip->type == THERMAL_TRIP_PASSIVE ?
ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip);
if (update_trip_devices(tz, acpi_trip, index, true))
return;
acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
}
struct adjust_trip_data {
struct acpi_thermal *tz;
u32 event;
};
static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
{
struct acpi_thermal_trip *acpi_trip = trip->priv;
struct adjust_trip_data *atd = data;
struct acpi_thermal *tz = atd->tz;
int temp;
if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
return 0;
if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS)
acpi_thermal_update_trip(tz, trip);
else
acpi_thermal_update_trip_devices(tz, trip);
if (acpi_thermal_trip_valid(acpi_trip))
temp = acpi_thermal_temp(tz, acpi_trip->temp_dk);
else
temp = THERMAL_TEMP_INVALID;
thermal_zone_set_trip_temp(tz->thermal_zone, trip, temp);
return 0;
}
static void acpi_queue_thermal_check(struct acpi_thermal *tz)
{
if (!work_pending(&tz->thermal_check_work))
queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
}
static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
{
struct adjust_trip_data atd = { .tz = tz, .event = event };
struct acpi_device *adev = tz->device;
/*
* Use thermal_zone_for_each_trip() to carry out the trip points
* update, so as to protect thermal_get_trend() from getting stale
* trip point temperatures and to prevent thermal_zone_device_update()
* invoked from acpi_thermal_check_fn() from producing inconsistent
* results.
*/
thermal_zone_for_each_trip(tz->thermal_zone,
acpi_thermal_adjust_trip, &atd);
acpi_queue_thermal_check(tz);
acpi_bus_generate_netlink_event(adev->pnp.device_class,
dev_name(&adev->dev), event, 0);
}
static int acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
{
int temp;
if (crt > 0) {
temp = celsius_to_deci_kelvin(crt);
goto set;
}
if (crt == -1) {
acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n");
return THERMAL_TEMP_INVALID;
}
if (acpi_critical_trip_temp(tz->device, &temp))
return THERMAL_TEMP_INVALID;
if (temp <= 2732) {
/*
* Below zero (Celsius) values clearly aren't right for sure,
* so discard them as invalid.
*/
pr_info(FW_BUG "Invalid critical threshold (%d)\n", temp);
return THERMAL_TEMP_INVALID;
}
set:
acpi_handle_debug(tz->device->handle, "Critical threshold [%d]\n", temp);
return temp;
}
static int acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
{
int temp;
if (acpi_hot_trip_temp(tz->device, &temp) || temp == THERMAL_TEMP_INVALID) {
acpi_handle_debug(tz->device->handle, "No hot threshold\n");
return THERMAL_TEMP_INVALID;
}
acpi_handle_debug(tz->device->handle, "Hot threshold [%d]\n", temp);
return temp;
}
static bool passive_trip_params_init(struct acpi_thermal *tz)
{
unsigned long long tmp;
acpi_status status;
status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp);
if (ACPI_FAILURE(status))
return false;
tz->trips.passive.tc1 = tmp;
status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp);
if (ACPI_FAILURE(status))
return false;
tz->trips.passive.tc2 = tmp;
status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
if (ACPI_SUCCESS(status)) {
tz->trips.passive.delay = tmp;
return true;
}
status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
if (ACPI_FAILURE(status))
return false;
tz->trips.passive.delay = tmp * 100;
return true;
}
static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index)
{
struct acpi_thermal_trip *acpi_trip;
long temp;
if (index == ACPI_THERMAL_TRIP_PASSIVE) {
acpi_trip = &tz->trips.passive.trip;
if (psv == -1)
goto fail;
if (!passive_trip_params_init(tz))
goto fail;
temp = psv > 0 ? celsius_to_deci_kelvin(psv) :
get_passive_temp(tz);
} else {
acpi_trip = &tz->trips.active[index].trip;
if (act == -1)
goto fail;
temp = get_active_temp(tz, index);
}
if (temp == THERMAL_TEMP_INVALID)
goto fail;
if (!update_trip_devices(tz, acpi_trip, index, false))
goto fail;
acpi_trip->temp_dk = temp;
return true;
fail:
acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
return false;
}
static void acpi_thermal_get_trip_points(struct acpi_thermal *tz)
{
int i;
acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE);
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
if (!acpi_thermal_init_trip(tz, i))
break;
}
while (++i < ACPI_THERMAL_MAX_ACTIVE)
tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
}
/* sys I/F for generic thermal sysfs support */
static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
{
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
int result;
if (!tz)
return -EINVAL;
result = acpi_thermal_get_temperature(tz);
if (result)
return result;
*temp = deci_kelvin_to_millicelsius_with_offset(tz->temp_dk,
tz->kelvin_offset);
return 0;
}
static int thermal_get_trend(struct thermal_zone_device *thermal,
const struct thermal_trip *trip,
enum thermal_trend *trend)
{
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
struct acpi_thermal_trip *acpi_trip;
int t;
if (!tz || !trip)
return -EINVAL;
acpi_trip = trip->priv;
if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
return -EINVAL;
switch (trip->type) {
case THERMAL_TRIP_PASSIVE:
t = tz->trips.passive.tc1 * (tz->temp_dk -
tz->last_temp_dk) +
tz->trips.passive.tc2 * (tz->temp_dk -
acpi_trip->temp_dk);
if (t > 0)
*trend = THERMAL_TREND_RAISING;
else if (t < 0)
*trend = THERMAL_TREND_DROPPING;
else
*trend = THERMAL_TREND_STABLE;
return 0;
case THERMAL_TRIP_ACTIVE:
t = acpi_thermal_temp(tz, tz->temp_dk);
if (t <= trip->temperature)
break;
*trend = THERMAL_TREND_RAISING;
return 0;
default:
break;
}
return -EINVAL;
}
static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
{
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
dev_name(&tz->device->dev),
ACPI_THERMAL_NOTIFY_HOT, 1);
}
static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
{
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
dev_name(&tz->device->dev),
ACPI_THERMAL_NOTIFY_CRITICAL, 1);
thermal_zone_device_critical(thermal);
}
static bool acpi_thermal_should_bind_cdev(struct thermal_zone_device *thermal,
const struct thermal_trip *trip,
struct thermal_cooling_device *cdev,
struct cooling_spec *c)
{
struct acpi_thermal_trip *acpi_trip = trip->priv;
struct acpi_device *cdev_adev = cdev->devdata;
int i;
/* Skip critical and hot trips. */
if (!acpi_trip)
return false;
for (i = 0; i < acpi_trip->devices.count; i++) {
acpi_handle handle = acpi_trip->devices.handles[i];
if (acpi_fetch_acpi_dev(handle) == cdev_adev)
return true;
}
return false;
}
static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
.should_bind = acpi_thermal_should_bind_cdev,
.get_temp = thermal_get_temp,
.get_trend = thermal_get_trend,
.hot = acpi_thermal_zone_device_hot,
.critical = acpi_thermal_zone_device_critical,
};
static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
{
struct device *tzdev = thermal_zone_device(tz->thermal_zone);
int ret;
ret = sysfs_create_link(&tz->device->dev.kobj,
&tzdev->kobj, "thermal_zone");
if (ret)
return ret;
ret = sysfs_create_link(&tzdev->kobj,
&tz->device->dev.kobj, "device");
if (ret)
sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
return ret;
}
static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
{
struct device *tzdev = thermal_zone_device(tz->thermal_zone);
sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
sysfs_remove_link(&tzdev->kobj, "device");
}
static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
const struct thermal_trip *trip_table,
unsigned int trip_count,
int passive_delay)
{
int result;
if (trip_count)
tz->thermal_zone = thermal_zone_device_register_with_trips(
"acpitz", trip_table, trip_count, tz,
&acpi_thermal_zone_ops, NULL, passive_delay,
tz->polling_frequency * 100);
else
tz->thermal_zone = thermal_tripless_zone_device_register(
"acpitz", tz, &acpi_thermal_zone_ops, NULL);
if (IS_ERR(tz->thermal_zone))
return PTR_ERR(tz->thermal_zone);
result = acpi_thermal_zone_sysfs_add(tz);
if (result)
goto unregister_tzd;
result = thermal_zone_device_enable(tz->thermal_zone);
if (result)
goto remove_links;
dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
thermal_zone_device_id(tz->thermal_zone));
return 0;
remove_links:
acpi_thermal_zone_sysfs_remove(tz);
unregister_tzd:
thermal_zone_device_unregister(tz->thermal_zone);
return result;
}
static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
{
thermal_zone_device_disable(tz->thermal_zone);
acpi_thermal_zone_sysfs_remove(tz);
thermal_zone_device_unregister(tz->thermal_zone);
tz->thermal_zone = NULL;
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_device *device = data;
struct acpi_thermal *tz = acpi_driver_data(device);
if (!tz)
return;
switch (event) {
case ACPI_THERMAL_NOTIFY_TEMPERATURE:
acpi_queue_thermal_check(tz);
break;
case ACPI_THERMAL_NOTIFY_THRESHOLDS:
case ACPI_THERMAL_NOTIFY_DEVICES:
acpi_thermal_trips_update(tz, event);
break;
default:
acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
event);
break;
}
}
/*
* On some platforms, the AML code has dependency about
* the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
* 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
* /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
* 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
* if _TMP has never been evaluated.
*
* As this dependency is totally transparent to OS, evaluate
* all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
* _TMP, before they are actually used.
*/
static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
{
acpi_handle handle = tz->device->handle;
unsigned long long value;
int i;
acpi_evaluate_integer(handle, "_CRT", NULL, &value);
acpi_evaluate_integer(handle, "_HOT", NULL, &value);
acpi_evaluate_integer(handle, "_PSV", NULL, &value);
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
acpi_status status;
status = acpi_evaluate_integer(handle, name, NULL, &value);
if (status == AE_NOT_FOUND)
break;
}
acpi_evaluate_integer(handle, "_TMP", NULL, &value);
}
/*
* The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
* handles temperature values with a single decimal place. As a consequence,
* some implementations use an offset of 273.1 and others use an offset of
* 273.2. Try to find out which one is being used, to present the most
* accurate and visually appealing number.
*
* The heuristic below should work for all ACPI thermal zones which have a
* critical trip point with a value being a multiple of 0.5 degree Celsius.
*/
static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
{
if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
tz->kelvin_offset = 273100;
else
tz->kelvin_offset = 273200;
}
static void acpi_thermal_check_fn(struct work_struct *work)
{
struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
thermal_check_work);
/*
* In general, it is not sufficient to check the pending bit, because
* subsequent instances of this function may be queued after one of them
* has started running (e.g. if _TMP sleeps). Avoid bailing out if just
* one of them is running, though, because it may have done the actual
* check some time ago, so allow at least one of them to block on the
* mutex while another one is running the update.
*/
if (!refcount_dec_not_one(&tz->thermal_check_count))
return;
mutex_lock(&tz->thermal_check_lock);
thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
refcount_inc(&tz->thermal_check_count);
mutex_unlock(&tz->thermal_check_lock);
}
static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
{
int i;
acpi_handle_list_free(&tz->trips.passive.trip.devices);
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
acpi_handle_list_free(&tz->trips.active[i].trip.devices);
kfree(tz);
}
static int acpi_thermal_add(struct acpi_device *device)
{
struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 };
struct acpi_thermal_trip *acpi_trip;
struct thermal_trip *trip;
struct acpi_thermal *tz;
int crit_temp, hot_temp;
int passive_delay = 0;
int result;
int i;
if (!device)
return -EINVAL;
tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
if (!tz)
return -ENOMEM;
tz->device = device;
strcpy(tz->name, device->pnp.bus_id);
strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
device->driver_data = tz;
acpi_thermal_aml_dependency_fix(tz);
/* Get trip points [_CRT, _PSV, etc.] (required). */
acpi_thermal_get_trip_points(tz);
crit_temp = acpi_thermal_get_critical_trip(tz);
hot_temp = acpi_thermal_get_hot_trip(tz);
/* Get temperature [_TMP] (required). */
result = acpi_thermal_get_temperature(tz);
if (result)
goto free_memory;
/* Set the cooling mode [_SCP] to active cooling. */
acpi_execute_simple_method(tz->device->handle, "_SCP",
ACPI_THERMAL_MODE_ACTIVE);
/* Determine the default polling frequency [_TZP]. */
if (tzp)
tz->polling_frequency = tzp;
else
acpi_thermal_get_polling_frequency(tz);
acpi_thermal_guess_offset(tz, crit_temp);
trip = trip_table;
if (crit_temp != THERMAL_TEMP_INVALID) {
trip->type = THERMAL_TRIP_CRITICAL;
trip->temperature = acpi_thermal_temp(tz, crit_temp);
trip++;
}
if (hot_temp != THERMAL_TEMP_INVALID) {
trip->type = THERMAL_TRIP_HOT;
trip->temperature = acpi_thermal_temp(tz, hot_temp);
trip++;
}
acpi_trip = &tz->trips.passive.trip;
if (acpi_thermal_trip_valid(acpi_trip)) {
passive_delay = tz->trips.passive.delay;
trip->type = THERMAL_TRIP_PASSIVE;
trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
trip->priv = acpi_trip;
trip++;
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
acpi_trip = &tz->trips.active[i].trip;
if (!acpi_thermal_trip_valid(acpi_trip))
break;
trip->type = THERMAL_TRIP_ACTIVE;
trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
trip->priv = acpi_trip;
trip++;
}
if (trip == trip_table)
pr_warn(FW_BUG "No valid trip points!\n");
result = acpi_thermal_register_thermal_zone(tz, trip_table,
trip - trip_table,
passive_delay);
if (result)
goto free_memory;
refcount_set(&tz->thermal_check_count, 3);
mutex_init(&tz->thermal_check_lock);
INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
acpi_thermal_notify, device);
if (result)
goto flush_wq;
return 0;
flush_wq:
flush_workqueue(acpi_thermal_pm_queue);
acpi_thermal_unregister_thermal_zone(tz);
free_memory:
acpi_thermal_free_thermal_zone(tz);
return result;
}
static void acpi_thermal_remove(struct acpi_device *device)
{
struct acpi_thermal *tz;
if (!device || !acpi_driver_data(device))
return;
tz = acpi_driver_data(device);
acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
acpi_thermal_notify);
flush_workqueue(acpi_thermal_pm_queue);
acpi_thermal_unregister_thermal_zone(tz);
acpi_thermal_free_thermal_zone(tz);
}
#ifdef CONFIG_PM_SLEEP
static int acpi_thermal_suspend(struct device *dev)
{
/* Make sure the previously queued thermal check work has been done */
flush_workqueue(acpi_thermal_pm_queue);
return 0;
}
static int acpi_thermal_resume(struct device *dev)
{
struct acpi_thermal *tz;
int i, j, power_state;
if (!dev)
return -EINVAL;
tz = acpi_driver_data(to_acpi_device(dev));
if (!tz)
return -EINVAL;
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
if (!acpi_thermal_trip_valid(acpi_trip))
break;
for (j = 0; j < acpi_trip->devices.count; j++) {
acpi_bus_update_power(acpi_trip->devices.handles[j],
&power_state);
}
}
acpi_queue_thermal_check(tz);
return AE_OK;
}
#else
#define acpi_thermal_suspend NULL
#define acpi_thermal_resume NULL
#endif
static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
static const struct acpi_device_id thermal_device_ids[] = {
{ACPI_THERMAL_HID, 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
static struct acpi_driver acpi_thermal_driver = {
.name = "thermal",
.class = ACPI_THERMAL_CLASS,
.ids = thermal_device_ids,
.ops = {
.add = acpi_thermal_add,
.remove = acpi_thermal_remove,
},
.drv.pm = &acpi_thermal_pm,
};
static int thermal_act(const struct dmi_system_id *d)
{
if (act == 0) {
pr_notice("%s detected: disabling all active thermal trip points\n",
d->ident);
act = -1;
}
return 0;
}
static int thermal_nocrt(const struct dmi_system_id *d)
{
pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
d->ident);
crt = -1;
return 0;
}
static int thermal_tzp(const struct dmi_system_id *d)
{
if (tzp == 0) {
pr_notice("%s detected: enabling thermal zone polling\n",
d->ident);
tzp = 300; /* 300 dS = 30 Seconds */
}
return 0;
}
static int thermal_psv(const struct dmi_system_id *d)
{
if (psv == 0) {
pr_notice("%s detected: disabling all passive thermal trip points\n",
d->ident);
psv = -1;
}
return 0;
}
static const struct dmi_system_id thermal_dmi_table[] __initconst = {
/*
* Award BIOS on this AOpen makes thermal control almost worthless.
* http://bugzilla.kernel.org/show_bug.cgi?id=8842
*/
{
.callback = thermal_act,
.ident = "AOpen i915GMm-HFS",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
},
},
{
.callback = thermal_psv,
.ident = "AOpen i915GMm-HFS",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
},
},
{
.callback = thermal_tzp,
.ident = "AOpen i915GMm-HFS",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
},
},
{
.callback = thermal_nocrt,
.ident = "Gigabyte GA-7ZX",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
},
},
{}
};
static int __init acpi_thermal_init(void)
{
int result;
dmi_check_system(thermal_dmi_table);
if (off) {
pr_notice("thermal control disabled\n");
return -ENODEV;
}
acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
if (!acpi_thermal_pm_queue)
return -ENODEV;
result = acpi_bus_register_driver(&acpi_thermal_driver);
if (result < 0) {
destroy_workqueue(acpi_thermal_pm_queue);
return -ENODEV;
}
return 0;
}
static void __exit acpi_thermal_exit(void)
{
acpi_bus_unregister_driver(&acpi_thermal_driver);
destroy_workqueue(acpi_thermal_pm_queue);
}
module_init(acpi_thermal_init);
module_exit(acpi_thermal_exit);
MODULE_IMPORT_NS(ACPI_THERMAL);
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
MODULE_LICENSE("GPL");
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