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linux-stable/drivers/acpi/thermal.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* 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>
#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_TRIPS_CRITICAL BIT(0)
#define ACPI_TRIPS_HOT BIT(1)
#define ACPI_TRIPS_PASSIVE BIT(2)
#define ACPI_TRIPS_ACTIVE BIT(3)
#define ACPI_TRIPS_DEVICES BIT(4)
#define ACPI_TRIPS_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
ACPI_TRIPS_DEVICES)
/*
* 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(flags, tz, str) \
do { \
if (flags != ACPI_TRIPS_INIT) \
acpi_handle_info(tz->device->handle, \
"ACPI thermal trip point %s changed\n" \
"Please report to linux-acpi@vger.kernel.org\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 temperature;
bool valid;
};
struct acpi_thermal_passive {
struct acpi_thermal_trip trip;
struct acpi_handle_list devices;
unsigned long tc1;
unsigned long tc2;
unsigned long tsp;
};
struct acpi_thermal_active {
struct acpi_thermal_trip trip;
struct acpi_handle_list devices;
};
struct acpi_thermal_trips {
struct acpi_thermal_trip critical;
struct acpi_thermal_trip hot;
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 temperature;
unsigned long last_temperature;
unsigned long polling_frequency;
volatile u8 zombie;
struct acpi_thermal_trips trips;
struct thermal_trip *trip_table;
struct acpi_handle_list devices;
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_temperature = tz->temperature;
status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
if (ACPI_FAILURE(status))
return -ENODEV;
tz->temperature = tmp;
acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
tz->temperature);
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)
{
if (temp_deci_k == THERMAL_TEMP_INVALID)
return THERMAL_TEMP_INVALID;
return deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
tz->kelvin_offset);
}
static void __acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
{
acpi_status status;
unsigned long long tmp;
struct acpi_handle_list devices;
bool valid = false;
int i;
/* Critical Shutdown */
if (flag & ACPI_TRIPS_CRITICAL) {
status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp);
tz->trips.critical.temperature = tmp;
/*
* Treat freezing temperatures as invalid as well; some
* BIOSes return really low values and cause reboots at startup.
* Below zero (Celsius) values clearly aren't right for sure..
* ... so lets discard those as invalid.
*/
if (ACPI_FAILURE(status)) {
tz->trips.critical.valid = false;
acpi_handle_debug(tz->device->handle,
"No critical threshold\n");
} else if (tmp <= 2732) {
pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
tz->trips.critical.valid = false;
} else {
tz->trips.critical.valid = true;
acpi_handle_debug(tz->device->handle,
"Found critical threshold [%lu]\n",
tz->trips.critical.temperature);
}
if (tz->trips.critical.valid) {
if (crt == -1) {
tz->trips.critical.valid = false;
} else if (crt > 0) {
unsigned long crt_k = celsius_to_deci_kelvin(crt);
/*
* Allow override critical threshold
*/
if (crt_k > tz->trips.critical.temperature)
pr_info("Critical threshold %d C\n", crt);
tz->trips.critical.temperature = crt_k;
}
}
}
/* Critical Sleep (optional) */
if (flag & ACPI_TRIPS_HOT) {
status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
if (ACPI_FAILURE(status)) {
tz->trips.hot.valid = false;
acpi_handle_debug(tz->device->handle,
"No hot threshold\n");
} else {
tz->trips.hot.temperature = tmp;
tz->trips.hot.valid = true;
acpi_handle_debug(tz->device->handle,
"Found hot threshold [%lu]\n",
tz->trips.hot.temperature);
}
}
/* Passive (optional) */
if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.trip.valid) ||
flag == ACPI_TRIPS_INIT) {
valid = tz->trips.passive.trip.valid;
if (psv == -1) {
status = AE_SUPPORT;
} else if (psv > 0) {
tmp = celsius_to_deci_kelvin(psv);
status = AE_OK;
} else {
status = acpi_evaluate_integer(tz->device->handle,
"_PSV", NULL, &tmp);
}
if (ACPI_FAILURE(status)) {
tz->trips.passive.trip.valid = false;
} else {
tz->trips.passive.trip.temperature = tmp;
tz->trips.passive.trip.valid = true;
if (flag == ACPI_TRIPS_INIT) {
status = acpi_evaluate_integer(tz->device->handle,
"_TC1", NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.trip.valid = false;
else
tz->trips.passive.tc1 = tmp;
status = acpi_evaluate_integer(tz->device->handle,
"_TC2", NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.trip.valid = false;
else
tz->trips.passive.tc2 = tmp;
status = acpi_evaluate_integer(tz->device->handle,
"_TSP", NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.trip.valid = false;
else
tz->trips.passive.tsp = tmp;
}
}
}
if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.trip.valid) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle, "_PSL",
NULL, &devices);
if (ACPI_FAILURE(status)) {
acpi_handle_info(tz->device->handle,
"Invalid passive threshold\n");
tz->trips.passive.trip.valid = false;
} else {
tz->trips.passive.trip.valid = true;
}
if (memcmp(&tz->trips.passive.devices, &devices,
sizeof(struct acpi_handle_list))) {
memcpy(&tz->trips.passive.devices, &devices,
sizeof(struct acpi_handle_list));
ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
}
}
if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
if (valid != tz->trips.passive.trip.valid)
ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
}
/* Active (optional) */
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
valid = tz->trips.active[i].trip.valid;
if (act == -1)
break; /* disable all active trip points */
if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) &&
tz->trips.active[i].trip.valid)) {
status = acpi_evaluate_integer(tz->device->handle,
name, NULL, &tmp);
if (ACPI_FAILURE(status)) {
tz->trips.active[i].trip.valid = false;
if (i == 0)
break;
if (act <= 0)
break;
if (i == 1)
tz->trips.active[0].trip.temperature =
celsius_to_deci_kelvin(act);
else
/*
* Don't allow override higher than
* the next higher trip point
*/
tz->trips.active[i-1].trip.temperature =
min_t(unsigned long,
tz->trips.active[i-2].trip.temperature,
celsius_to_deci_kelvin(act));
break;
} else {
tz->trips.active[i].trip.temperature = tmp;
tz->trips.active[i].trip.valid = true;
}
}
name[2] = 'L';
if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].trip.valid) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle,
name, NULL, &devices);
if (ACPI_FAILURE(status)) {
acpi_handle_info(tz->device->handle,
"Invalid active%d threshold\n", i);
tz->trips.active[i].trip.valid = false;
} else {
tz->trips.active[i].trip.valid = true;
}
if (memcmp(&tz->trips.active[i].devices, &devices,
sizeof(struct acpi_handle_list))) {
memcpy(&tz->trips.active[i].devices, &devices,
sizeof(struct acpi_handle_list));
ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
}
}
if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
if (valid != tz->trips.active[i].trip.valid)
ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
if (!tz->trips.active[i].trip.valid)
break;
}
if (flag & ACPI_TRIPS_DEVICES) {
memset(&devices, 0, sizeof(devices));
status = acpi_evaluate_reference(tz->device->handle, "_TZD",
NULL, &devices);
if (ACPI_SUCCESS(status) &&
memcmp(&tz->devices, &devices, sizeof(devices))) {
tz->devices = devices;
ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
}
}
}
static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
{
struct acpi_thermal_trip *acpi_trip = trip->priv;
struct acpi_thermal *tz = data;
if (!acpi_trip)
return 0;
if (acpi_trip->valid)
trip->temperature = acpi_thermal_temp(tz, acpi_trip->temperature);
else
trip->temperature = THERMAL_TEMP_INVALID;
return 0;
}
static void acpi_thermal_adjust_thermal_zone(struct thermal_zone_device *thermal,
unsigned long data)
{
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
int flag = data == ACPI_THERMAL_NOTIFY_THRESHOLDS ?
ACPI_TRIPS_THRESHOLDS : ACPI_TRIPS_DEVICES;
__acpi_thermal_trips_update(tz, flag);
for_each_thermal_trip(tz->thermal_zone, acpi_thermal_adjust_trip, tz);
}
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 acpi_device *adev = tz->device;
/*
* Use thermal_zone_device_exec() 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_device_exec(tz->thermal_zone,
acpi_thermal_adjust_thermal_zone, event);
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_trip_points(struct acpi_thermal *tz)
{
bool valid;
int i;
__acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
valid = tz->trips.critical.valid |
tz->trips.hot.valid |
tz->trips.passive.trip.valid;
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
valid = valid || tz->trips.active[i].trip.valid;
if (!valid) {
pr_warn(FW_BUG "No valid trip found\n");
return -ENODEV;
}
return 0;
}
/* 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->temperature,
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_trip->valid)
return -EINVAL;
switch (trip->type) {
case THERMAL_TRIP_PASSIVE:
t = tz->trips.passive.tc1 * (tz->temperature -
tz->last_temperature) +
tz->trips.passive.tc2 * (tz->temperature -
acpi_trip->temperature);
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->temperature);
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 int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev,
bool bind)
{
struct acpi_device *device = cdev->devdata;
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
struct acpi_device *dev;
acpi_handle handle;
int i;
int j;
int trip = -1;
int result = 0;
if (tz->trips.critical.valid)
trip++;
if (tz->trips.hot.valid)
trip++;
if (tz->trips.passive.trip.valid) {
trip++;
for (i = 0; i < tz->trips.passive.devices.count; i++) {
handle = tz->trips.passive.devices.handles[i];
dev = acpi_fetch_acpi_dev(handle);
if (dev != device)
continue;
if (bind)
result = thermal_zone_bind_cooling_device(
thermal, trip, cdev,
THERMAL_NO_LIMIT,
THERMAL_NO_LIMIT,
THERMAL_WEIGHT_DEFAULT);
else
result =
thermal_zone_unbind_cooling_device(
thermal, trip, cdev);
if (result)
goto failed;
}
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
if (!tz->trips.active[i].trip.valid)
break;
trip++;
for (j = 0; j < tz->trips.active[i].devices.count; j++) {
handle = tz->trips.active[i].devices.handles[j];
dev = acpi_fetch_acpi_dev(handle);
if (dev != device)
continue;
if (bind)
result = thermal_zone_bind_cooling_device(
thermal, trip, cdev,
THERMAL_NO_LIMIT,
THERMAL_NO_LIMIT,
THERMAL_WEIGHT_DEFAULT);
else
result = thermal_zone_unbind_cooling_device(
thermal, trip, cdev);
if (result)
goto failed;
}
}
failed:
return result;
}
static int
acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
return acpi_thermal_cooling_device_cb(thermal, cdev, true);
}
static int
acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
return acpi_thermal_cooling_device_cb(thermal, cdev, false);
}
static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
.bind = acpi_thermal_bind_cooling_device,
.unbind = acpi_thermal_unbind_cooling_device,
.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)
{
struct acpi_thermal_trip *acpi_trip;
struct thermal_trip *trip;
int passive_delay = 0;
int trip_count = 0;
int result;
int i;
if (tz->trips.critical.valid)
trip_count++;
if (tz->trips.hot.valid)
trip_count++;
if (tz->trips.passive.trip.valid) {
trip_count++;
passive_delay = tz->trips.passive.tsp * 100;
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].trip.valid; i++)
trip_count++;
trip = kcalloc(trip_count, sizeof(*trip), GFP_KERNEL);
if (!trip)
return -ENOMEM;
tz->trip_table = trip;
if (tz->trips.critical.valid) {
trip->type = THERMAL_TRIP_CRITICAL;
trip->temperature = acpi_thermal_temp(tz, tz->trips.critical.temperature);
trip++;
}
if (tz->trips.hot.valid) {
trip->type = THERMAL_TRIP_HOT;
trip->temperature = acpi_thermal_temp(tz, tz->trips.hot.temperature);
trip++;
}
acpi_trip = &tz->trips.passive.trip;
if (acpi_trip->valid) {
trip->type = THERMAL_TRIP_PASSIVE;
trip->temperature = acpi_thermal_temp(tz, acpi_trip->temperature);
trip->priv = acpi_trip;
trip++;
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
acpi_trip = &tz->trips.active[i].trip;
if (!acpi_trip->valid)
break;
trip->type = THERMAL_TRIP_ACTIVE;
trip->temperature = acpi_thermal_temp(tz, acpi_trip->temperature);
trip->priv = acpi_trip;
trip++;
}
tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz",
tz->trip_table,
trip_count,
0, tz,
&acpi_thermal_zone_ops,
NULL,
passive_delay,
tz->polling_frequency * 100);
if (IS_ERR(tz->thermal_zone)) {
result = PTR_ERR(tz->thermal_zone);
goto free_trip_table;
}
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);
free_trip_table:
kfree(tz->trip_table);
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);
}
static int acpi_thermal_get_info(struct acpi_thermal *tz)
{
int result;
if (!tz)
return -EINVAL;
acpi_thermal_aml_dependency_fix(tz);
/* Get trip points [_CRT, _PSV, etc.] (required) */
result = acpi_thermal_get_trip_points(tz);
if (result)
return result;
/* Get temperature [_TMP] (required) */
result = acpi_thermal_get_temperature(tz);
if (result)
return result;
/* Set the cooling mode [_SCP] to active cooling (default) */
acpi_execute_simple_method(tz->device->handle, "_SCP",
ACPI_THERMAL_MODE_ACTIVE);
/* Get default polling frequency [_TZP] (optional) */
if (tzp)
tz->polling_frequency = tzp;
else
acpi_thermal_get_polling_frequency(tz);
return 0;
}
/*
* 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)
{
if (tz->trips.critical.valid &&
(tz->trips.critical.temperature % 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 int acpi_thermal_add(struct acpi_device *device)
{
struct acpi_thermal *tz;
int result;
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;
result = acpi_thermal_get_info(tz);
if (result)
goto free_memory;
acpi_thermal_guess_offset(tz);
result = acpi_thermal_register_thermal_zone(tz);
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->temperature));
result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
acpi_thermal_notify);
if (result)
goto flush_wq;
return 0;
flush_wq:
flush_workqueue(acpi_thermal_pm_queue);
acpi_thermal_unregister_thermal_zone(tz);
free_memory:
kfree(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);
kfree(tz->trip_table);
kfree(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++) {
if (!tz->trips.active[i].trip.valid)
break;
for (j = 0; j < tz->trips.active[i].devices.count; j++) {
acpi_bus_update_power(tz->trips.active[i].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_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
MODULE_LICENSE("GPL");
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