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alistair23-linux/drivers/acpi/thermal.c
Linus Torvalds 476525004a Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 
Pull ACPI & power management update from Len Brown:
 "Re-write of the turbostat tool.
     lower overhead was necessary for measuring very large system when
     they are very idle.

  IVB support in intel_idle
     It's what I run on my IVB, others should be able to also:-)

  ACPICA core update
     We have found some bugs due to divergence between Linux and the
     upstream ACPICA base.  Most of these patches are to reduce that
     divergence to reduce the risk of future bugs.

  Some cpuidle updates, mostly for non-Intel
     More will be coming, as they depend on this part.

  Some thermal management changes needed by non-ACPI systems.

  Some _OST (OS Status Indication) updates for hot ACPI hot-plug."

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux: (51 commits)
  Thermal: Documentation update
  Thermal: Add Hysteresis attributes
  Thermal: Make Thermal trip points writeable
  ACPI/AC: prevent OOPS on some boxes due to missing check power_supply_register() return value check
  tools/power: turbostat: fix large c1% issue
  tools/power: turbostat v2 - re-write for efficiency
  ACPICA: Update to version 20120711
  ACPICA: AcpiSrc: Fix some translation issues for Linux conversion
  ACPICA: Update header files copyrights to 2012
  ACPICA: Add new ACPI table load/unload external interfaces
  ACPICA: Split file: tbxface.c -> tbxfload.c
  ACPICA: Add PCC address space to space ID decode function
  ACPICA: Fix some comment fields
  ACPICA: Table manager: deploy new firmware error/warning interfaces
  ACPICA: Add new interfaces for BIOS(firmware) errors and warnings
  ACPICA: Split exception code utilities to a new file, utexcep.c
  ACPI: acpi_pad: tune round_robin_time
  ACPICA: Update to version 20120620
  ACPICA: Add support for implicit notify on multiple devices
  ACPICA: Update comments; no functional change
  ...
2012-07-26 14:28:55 -07:00

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/*
* 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 program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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.
*
*/
#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 <asm/uaccess.h>
#include <linux/thermal.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define PREFIX "ACPI: "
#define ACPI_THERMAL_CLASS "thermal_zone"
#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
#define ACPI_THERMAL_FILE_STATE "state"
#define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
#define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
#define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
#define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
#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 _COMPONENT ACPI_THERMAL_COMPONENT
ACPI_MODULE_NAME("thermal");
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
MODULE_LICENSE("GPL");
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 nocrt;
module_param(nocrt, int, 0);
MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
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 int acpi_thermal_add(struct acpi_device *device);
static int acpi_thermal_remove(struct acpi_device *device, int type);
static void acpi_thermal_notify(struct acpi_device *device, u32 event);
static const struct acpi_device_id thermal_device_ids[] = {
{ACPI_THERMAL_HID, 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
static int acpi_thermal_resume(struct device *dev);
static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
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,
.notify = acpi_thermal_notify,
},
.drv.pm = &acpi_thermal_pm,
};
struct acpi_thermal_state {
u8 critical:1;
u8 hot:1;
u8 passive:1;
u8 active:1;
u8 reserved:4;
int active_index;
};
struct acpi_thermal_state_flags {
u8 valid:1;
u8 enabled:1;
u8 reserved:6;
};
struct acpi_thermal_critical {
struct acpi_thermal_state_flags flags;
unsigned long temperature;
};
struct acpi_thermal_hot {
struct acpi_thermal_state_flags flags;
unsigned long temperature;
};
struct acpi_thermal_passive {
struct acpi_thermal_state_flags flags;
unsigned long temperature;
unsigned long tc1;
unsigned long tc2;
unsigned long tsp;
struct acpi_handle_list devices;
};
struct acpi_thermal_active {
struct acpi_thermal_state_flags flags;
unsigned long temperature;
struct acpi_handle_list devices;
};
struct acpi_thermal_trips {
struct acpi_thermal_critical critical;
struct acpi_thermal_hot hot;
struct acpi_thermal_passive passive;
struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
};
struct acpi_thermal_flags {
u8 cooling_mode:1; /* _SCP */
u8 devices:1; /* _TZD */
u8 reserved:6;
};
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_flags flags;
struct acpi_thermal_state state;
struct acpi_thermal_trips trips;
struct acpi_handle_list devices;
struct thermal_zone_device *thermal_zone;
int tz_enabled;
int kelvin_offset;
struct mutex lock;
};
/* --------------------------------------------------------------------------
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_DEBUG_PRINT((ACPI_DB_INFO, "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_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
tz->polling_frequency));
return 0;
}
static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
{
acpi_status status = AE_OK;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list arg_list = { 1, &arg0 };
acpi_handle handle = NULL;
if (!tz)
return -EINVAL;
status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
return -ENODEV;
}
arg0.integer.value = mode;
status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
if (ACPI_FAILURE(status))
return -ENODEV;
return 0;
}
#define ACPI_TRIPS_CRITICAL 0x01
#define ACPI_TRIPS_HOT 0x02
#define ACPI_TRIPS_PASSIVE 0x04
#define ACPI_TRIPS_ACTIVE 0x08
#define ACPI_TRIPS_DEVICES 0x10
#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
#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, str) \
do { \
if (flags != ACPI_TRIPS_INIT) \
ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
"ACPI thermal trip point %s changed\n" \
"Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
} while (0)
static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
{
acpi_status status = AE_OK;
unsigned long long tmp;
struct acpi_handle_list devices;
int valid = 0;
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.flags.valid = 0;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No critical threshold\n"));
} else if (tmp <= 2732) {
printk(KERN_WARNING FW_BUG "Invalid critical threshold "
"(%llu)\n", tmp);
tz->trips.critical.flags.valid = 0;
} else {
tz->trips.critical.flags.valid = 1;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found critical threshold [%lu]\n",
tz->trips.critical.temperature));
}
if (tz->trips.critical.flags.valid == 1) {
if (crt == -1) {
tz->trips.critical.flags.valid = 0;
} else if (crt > 0) {
unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
/*
* Allow override critical threshold
*/
if (crt_k > tz->trips.critical.temperature)
printk(KERN_WARNING PREFIX
"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.flags.valid = 0;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No hot threshold\n"));
} else {
tz->trips.hot.temperature = tmp;
tz->trips.hot.flags.valid = 1;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found hot threshold [%lu]\n",
tz->trips.critical.temperature));
}
}
/* Passive (optional) */
if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
(flag == ACPI_TRIPS_INIT)) {
valid = tz->trips.passive.flags.valid;
if (psv == -1) {
status = AE_SUPPORT;
} else if (psv > 0) {
tmp = CELSIUS_TO_KELVIN(psv);
status = AE_OK;
} else {
status = acpi_evaluate_integer(tz->device->handle,
"_PSV", NULL, &tmp);
}
if (ACPI_FAILURE(status))
tz->trips.passive.flags.valid = 0;
else {
tz->trips.passive.temperature = tmp;
tz->trips.passive.flags.valid = 1;
if (flag == ACPI_TRIPS_INIT) {
status = acpi_evaluate_integer(
tz->device->handle, "_TC1",
NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.flags.valid = 0;
else
tz->trips.passive.tc1 = tmp;
status = acpi_evaluate_integer(
tz->device->handle, "_TC2",
NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.flags.valid = 0;
else
tz->trips.passive.tc2 = tmp;
status = acpi_evaluate_integer(
tz->device->handle, "_TSP",
NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.flags.valid = 0;
else
tz->trips.passive.tsp = tmp;
}
}
}
if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle, "_PSL",
NULL, &devices);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING PREFIX
"Invalid passive threshold\n");
tz->trips.passive.flags.valid = 0;
}
else
tz->trips.passive.flags.valid = 1;
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, "device");
}
}
if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
if (valid != tz->trips.passive.flags.valid)
ACPI_THERMAL_TRIPS_EXCEPTION(flag, "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].flags.valid;
if (act == -1)
break; /* disable all active trip points */
if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
tz->trips.active[i].flags.valid)) {
status = acpi_evaluate_integer(tz->device->handle,
name, NULL, &tmp);
if (ACPI_FAILURE(status)) {
tz->trips.active[i].flags.valid = 0;
if (i == 0)
break;
if (act <= 0)
break;
if (i == 1)
tz->trips.active[0].temperature =
CELSIUS_TO_KELVIN(act);
else
/*
* Don't allow override higher than
* the next higher trip point
*/
tz->trips.active[i - 1].temperature =
(tz->trips.active[i - 2].temperature <
CELSIUS_TO_KELVIN(act) ?
tz->trips.active[i - 2].temperature :
CELSIUS_TO_KELVIN(act));
break;
} else {
tz->trips.active[i].temperature = tmp;
tz->trips.active[i].flags.valid = 1;
}
}
name[2] = 'L';
if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle,
name, NULL, &devices);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING PREFIX
"Invalid active%d threshold\n", i);
tz->trips.active[i].flags.valid = 0;
}
else
tz->trips.active[i].flags.valid = 1;
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, "device");
}
}
if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
if (valid != tz->trips.active[i].flags.valid)
ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
if (!tz->trips.active[i].flags.valid)
break;
}
if (flag & ACPI_TRIPS_DEVICES) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle, "_TZD",
NULL, &devices);
if (memcmp(&tz->devices, &devices,
sizeof(struct acpi_handle_list))) {
memcpy(&tz->devices, &devices,
sizeof(struct acpi_handle_list));
ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
}
}
return 0;
}
static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
{
int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
if (ret)
return ret;
valid = tz->trips.critical.flags.valid |
tz->trips.hot.flags.valid |
tz->trips.passive.flags.valid;
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
valid |= tz->trips.active[i].flags.valid;
if (!valid) {
printk(KERN_WARNING FW_BUG "No valid trip found\n");
return -ENODEV;
}
return 0;
}
static void acpi_thermal_check(void *data)
{
struct acpi_thermal *tz = data;
thermal_zone_device_update(tz->thermal_zone);
}
/* sys I/F for generic thermal sysfs support */
#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
static int thermal_get_temp(struct thermal_zone_device *thermal,
unsigned long *temp)
{
struct acpi_thermal *tz = thermal->devdata;
int result;
if (!tz)
return -EINVAL;
result = acpi_thermal_get_temperature(tz);
if (result)
return result;
*temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
return 0;
}
static int thermal_get_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode *mode)
{
struct acpi_thermal *tz = thermal->devdata;
if (!tz)
return -EINVAL;
*mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
THERMAL_DEVICE_DISABLED;
return 0;
}
static int thermal_set_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode mode)
{
struct acpi_thermal *tz = thermal->devdata;
int enable;
if (!tz)
return -EINVAL;
/*
* enable/disable thermal management from ACPI thermal driver
*/
if (mode == THERMAL_DEVICE_ENABLED)
enable = 1;
else if (mode == THERMAL_DEVICE_DISABLED)
enable = 0;
else
return -EINVAL;
if (enable != tz->tz_enabled) {
tz->tz_enabled = enable;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"%s kernel ACPI thermal control\n",
tz->tz_enabled ? "Enable" : "Disable"));
acpi_thermal_check(tz);
}
return 0;
}
static int thermal_get_trip_type(struct thermal_zone_device *thermal,
int trip, enum thermal_trip_type *type)
{
struct acpi_thermal *tz = thermal->devdata;
int i;
if (!tz || trip < 0)
return -EINVAL;
if (tz->trips.critical.flags.valid) {
if (!trip) {
*type = THERMAL_TRIP_CRITICAL;
return 0;
}
trip--;
}
if (tz->trips.hot.flags.valid) {
if (!trip) {
*type = THERMAL_TRIP_HOT;
return 0;
}
trip--;
}
if (tz->trips.passive.flags.valid) {
if (!trip) {
*type = THERMAL_TRIP_PASSIVE;
return 0;
}
trip--;
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
tz->trips.active[i].flags.valid; i++) {
if (!trip) {
*type = THERMAL_TRIP_ACTIVE;
return 0;
}
trip--;
}
return -EINVAL;
}
static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
int trip, unsigned long *temp)
{
struct acpi_thermal *tz = thermal->devdata;
int i;
if (!tz || trip < 0)
return -EINVAL;
if (tz->trips.critical.flags.valid) {
if (!trip) {
*temp = KELVIN_TO_MILLICELSIUS(
tz->trips.critical.temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
if (tz->trips.hot.flags.valid) {
if (!trip) {
*temp = KELVIN_TO_MILLICELSIUS(
tz->trips.hot.temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
if (tz->trips.passive.flags.valid) {
if (!trip) {
*temp = KELVIN_TO_MILLICELSIUS(
tz->trips.passive.temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
tz->trips.active[i].flags.valid; i++) {
if (!trip) {
*temp = KELVIN_TO_MILLICELSIUS(
tz->trips.active[i].temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
return -EINVAL;
}
static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
unsigned long *temperature) {
struct acpi_thermal *tz = thermal->devdata;
if (tz->trips.critical.flags.valid) {
*temperature = KELVIN_TO_MILLICELSIUS(
tz->trips.critical.temperature,
tz->kelvin_offset);
return 0;
} else
return -EINVAL;
}
static int thermal_notify(struct thermal_zone_device *thermal, int trip,
enum thermal_trip_type trip_type)
{
u8 type = 0;
struct acpi_thermal *tz = thermal->devdata;
if (trip_type == THERMAL_TRIP_CRITICAL)
type = ACPI_THERMAL_NOTIFY_CRITICAL;
else if (trip_type == THERMAL_TRIP_HOT)
type = ACPI_THERMAL_NOTIFY_HOT;
else
return 0;
acpi_bus_generate_proc_event(tz->device, type, 1);
acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
dev_name(&tz->device->dev), type, 1);
if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
return 1;
return 0;
}
typedef int (*cb)(struct thermal_zone_device *, int,
struct thermal_cooling_device *);
static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev,
cb action)
{
struct acpi_device *device = cdev->devdata;
struct acpi_thermal *tz = thermal->devdata;
struct acpi_device *dev;
acpi_status status;
acpi_handle handle;
int i;
int j;
int trip = -1;
int result = 0;
if (tz->trips.critical.flags.valid)
trip++;
if (tz->trips.hot.flags.valid)
trip++;
if (tz->trips.passive.flags.valid) {
trip++;
for (i = 0; i < tz->trips.passive.devices.count;
i++) {
handle = tz->trips.passive.devices.handles[i];
status = acpi_bus_get_device(handle, &dev);
if (ACPI_SUCCESS(status) && (dev == device)) {
result = action(thermal, trip, cdev);
if (result)
goto failed;
}
}
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
if (!tz->trips.active[i].flags.valid)
break;
trip++;
for (j = 0;
j < tz->trips.active[i].devices.count;
j++) {
handle = tz->trips.active[i].devices.handles[j];
status = acpi_bus_get_device(handle, &dev);
if (ACPI_SUCCESS(status) && (dev == device)) {
result = action(thermal, trip, cdev);
if (result)
goto failed;
}
}
}
for (i = 0; i < tz->devices.count; i++) {
handle = tz->devices.handles[i];
status = acpi_bus_get_device(handle, &dev);
if (ACPI_SUCCESS(status) && (dev == device)) {
result = action(thermal, -1, 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,
thermal_zone_bind_cooling_device);
}
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,
thermal_zone_unbind_cooling_device);
}
static const 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_mode = thermal_get_mode,
.set_mode = thermal_set_mode,
.get_trip_type = thermal_get_trip_type,
.get_trip_temp = thermal_get_trip_temp,
.get_crit_temp = thermal_get_crit_temp,
.notify = thermal_notify,
};
static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
{
int trips = 0;
int result;
acpi_status status;
int i;
if (tz->trips.critical.flags.valid)
trips++;
if (tz->trips.hot.flags.valid)
trips++;
if (tz->trips.passive.flags.valid)
trips++;
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
tz->trips.active[i].flags.valid; i++, trips++);
if (tz->trips.passive.flags.valid)
tz->thermal_zone =
thermal_zone_device_register("acpitz", trips, 0, tz,
&acpi_thermal_zone_ops,
tz->trips.passive.tc1,
tz->trips.passive.tc2,
tz->trips.passive.tsp*100,
tz->polling_frequency*100);
else
tz->thermal_zone =
thermal_zone_device_register("acpitz", trips, 0, tz,
&acpi_thermal_zone_ops,
0, 0, 0,
tz->polling_frequency*100);
if (IS_ERR(tz->thermal_zone))
return -ENODEV;
result = sysfs_create_link(&tz->device->dev.kobj,
&tz->thermal_zone->device.kobj, "thermal_zone");
if (result)
return result;
result = sysfs_create_link(&tz->thermal_zone->device.kobj,
&tz->device->dev.kobj, "device");
if (result)
return result;
status = acpi_attach_data(tz->device->handle,
acpi_bus_private_data_handler,
tz->thermal_zone);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX
"Error attaching device data\n");
return -ENODEV;
}
tz->tz_enabled = 1;
dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
tz->thermal_zone->id);
return 0;
}
static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
{
sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
thermal_zone_device_unregister(tz->thermal_zone);
tz->thermal_zone = NULL;
acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static void acpi_thermal_notify(struct acpi_device *device, u32 event)
{
struct acpi_thermal *tz = acpi_driver_data(device);
if (!tz)
return;
switch (event) {
case ACPI_THERMAL_NOTIFY_TEMPERATURE:
acpi_thermal_check(tz);
break;
case ACPI_THERMAL_NOTIFY_THRESHOLDS:
acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
acpi_thermal_check(tz);
acpi_bus_generate_proc_event(device, event, 0);
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event, 0);
break;
case ACPI_THERMAL_NOTIFY_DEVICES:
acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
acpi_thermal_check(tz);
acpi_bus_generate_proc_event(device, event, 0);
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event, 0);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
}
static int acpi_thermal_get_info(struct acpi_thermal *tz)
{
int result = 0;
if (!tz)
return -EINVAL;
/* 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) */
result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
if (!result)
tz->flags.cooling_mode = 1;
/* 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.flags.valid &&
(tz->trips.critical.temperature % 5) == 1)
tz->kelvin_offset = 2731;
else
tz->kelvin_offset = 2732;
}
static int acpi_thermal_add(struct acpi_device *device)
{
int result = 0;
struct acpi_thermal *tz = NULL;
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;
mutex_init(&tz->lock);
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;
printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
acpi_device_name(device), acpi_device_bid(device),
KELVIN_TO_CELSIUS(tz->temperature));
goto end;
free_memory:
kfree(tz);
end:
return result;
}
static int acpi_thermal_remove(struct acpi_device *device, int type)
{
struct acpi_thermal *tz = NULL;
if (!device || !acpi_driver_data(device))
return -EINVAL;
tz = acpi_driver_data(device);
acpi_thermal_unregister_thermal_zone(tz);
mutex_destroy(&tz->lock);
kfree(tz);
return 0;
}
static int acpi_thermal_resume(struct device *dev)
{
struct acpi_thermal *tz;
int i, j, power_state, result;
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]))
break;
if (!tz->trips.active[i].flags.valid)
break;
tz->trips.active[i].flags.enabled = 1;
for (j = 0; j < tz->trips.active[i].devices.count; j++) {
result = acpi_bus_update_power(
tz->trips.active[i].devices.handles[j],
&power_state);
if (result || (power_state != ACPI_STATE_D0)) {
tz->trips.active[i].flags.enabled = 0;
break;
}
}
tz->state.active |= tz->trips.active[i].flags.enabled;
}
acpi_thermal_check(tz);
return AE_OK;
}
static int thermal_act(const struct dmi_system_id *d) {
if (act == 0) {
printk(KERN_NOTICE "ACPI: %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) {
printk(KERN_NOTICE "ACPI: %s detected: "
"disabling all critical thermal trip point actions.\n", d->ident);
nocrt = 1;
return 0;
}
static int thermal_tzp(const struct dmi_system_id *d) {
if (tzp == 0) {
printk(KERN_NOTICE "ACPI: %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) {
printk(KERN_NOTICE "ACPI: %s detected: "
"disabling all passive thermal trip points\n", d->ident);
psv = -1;
}
return 0;
}
static struct dmi_system_id thermal_dmi_table[] __initdata = {
/*
* 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 = 0;
dmi_check_system(thermal_dmi_table);
if (off) {
printk(KERN_NOTICE "ACPI: thermal control disabled\n");
return -ENODEV;
}
result = acpi_bus_register_driver(&acpi_thermal_driver);
if (result < 0)
return -ENODEV;
return 0;
}
static void __exit acpi_thermal_exit(void)
{
acpi_bus_unregister_driver(&acpi_thermal_driver);
return;
}
module_init(acpi_thermal_init);
module_exit(acpi_thermal_exit);
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