linux/drivers/acpi/thermal.c

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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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
#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>
ACPI: Clean up inclusions of ACPI header files Replace direct inclusions of <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h>, which are incorrect, with <linux/acpi.h> inclusions and remove some inclusions of those files that aren't necessary. First of all, <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h> should not be included directly from any files that are built for CONFIG_ACPI unset, because that generally leads to build warnings about undefined symbols in !CONFIG_ACPI builds. For CONFIG_ACPI set, <linux/acpi.h> includes those files and for CONFIG_ACPI unset it provides stub ACPI symbols to be used in that case. Second, there are ordering dependencies between those files that always have to be met. Namely, it is required that <acpi/acpi_bus.h> be included prior to <acpi/acpi_drivers.h> so that the acpi_pci_root declarations the latter depends on are always there. And <acpi/acpi.h> which provides basic ACPICA type declarations should always be included prior to any other ACPI headers in CONFIG_ACPI builds. That also is taken care of including <linux/acpi.h> as appropriate. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Tony Luck <tony.luck@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> (drivers/pci stuff) Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> (Xen stuff) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-12-03 01:49:16 +01:00
#include <linux/acpi.h>
#include <linux/workqueue.h>
ACPI: Clean up inclusions of ACPI header files Replace direct inclusions of <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h>, which are incorrect, with <linux/acpi.h> inclusions and remove some inclusions of those files that aren't necessary. First of all, <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h> should not be included directly from any files that are built for CONFIG_ACPI unset, because that generally leads to build warnings about undefined symbols in !CONFIG_ACPI builds. For CONFIG_ACPI set, <linux/acpi.h> includes those files and for CONFIG_ACPI unset it provides stub ACPI symbols to be used in that case. Second, there are ordering dependencies between those files that always have to be met. Namely, it is required that <acpi/acpi_bus.h> be included prior to <acpi/acpi_drivers.h> so that the acpi_pci_root declarations the latter depends on are always there. And <acpi/acpi.h> which provides basic ACPICA type declarations should always be included prior to any other ACPI headers in CONFIG_ACPI builds. That also is taken care of including <linux/acpi.h> as appropriate. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Tony Luck <tony.luck@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> (drivers/pci stuff) Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> (Xen stuff) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-12-03 01:49:16 +01:00
#include <asm/uaccess.h>
#define PREFIX "ACPI: "
#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 _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;
ACPI: thermal: expose "thermal.tzp=" to set global polling frequency Thermal Zone Polling frequency (_TZP) is an optional ACPI object recommending the rate that the OS should poll the associated thermal zone. If _TZP is 0, no polling should be used. If _TZP is non-zero, then the platform recommends that the OS poll the thermal zone at the specified rate. The minimum period is 30 seconds. The maximum period is 5 minutes. (note _TZP and thermal.tzp units are in deci-seconds, so _TZP = 300 corresponds to 30 seconds) If _TZP is not present, ACPI 3.0b recommends that the thermal zone be polled at an "OS provided default frequency". However, common industry practice is: 1. The BIOS never specifies any _TZP 2. High volume OS's from this century never poll any thermal zones Ie. The OS depends on the platform's ability to provoke thermal events when necessary, and the "OS provided default frequency" is "never":-) There is a proposal that ACPI 4.0 be updated to reflect common industry practice -- ie. no _TZP, no polling. The Linux kernel already follows this practice -- thermal zones are not polled unless _TZP is present and non-zero. But thermal zone polling is useful as a workaround for systems which have ACPI thermal control, but have an issue preventing thermal events. Indeed, some Linux distributions still set a non-zero thermal polling frequency for this reason. But rather than ask the user to write a polling frequency into all the /proc/acpi/thermal_zone/*/polling_frequency files, here we simply document and expose the already existing module parameter to do the same at system level, to simplify debugging those broken platforms. Note that thermal.tzp is a module-load time parameter only. Signed-off-by: Len Brown <len.brown@intel.com>
2007-08-12 06:12:26 +02:00
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 struct workqueue_struct *acpi_thermal_pm_queue;
static int acpi_thermal_add(struct acpi_device *device);
static int acpi_thermal_remove(struct acpi_device *device);
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);
#ifdef CONFIG_PM_SLEEP
static int acpi_thermal_suspend(struct device *dev);
static int acpi_thermal_resume(struct device *dev);
#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 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 work_struct thermal_check_work;
};
/* --------------------------------------------------------------------------
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)
{
if (!tz)
return -EINVAL;
if (!acpi_has_method(tz->device->handle, "_SCP")) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
return -ENODEV;
} else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
"_SCP", mode))) {
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", 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) {
pr_warn(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)
pr_warn(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.hot.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)) {
pr_warn(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)) {
pr_warn(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)
&& acpi_has_method(tz->device->handle, "_TZD")) {
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, "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) {
pr_warn(FW_BUG "No valid trip found\n");
return -ENODEV;
}
return 0;
}
static void acpi_thermal_check(void *data)
{
struct acpi_thermal *tz = data;
if (!tz->tz_enabled)
return;
thermal_zone_device_update(tz->thermal_zone);
}
/* sys I/F for generic thermal sysfs support */
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 = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(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;
pr_warn("thermal zone will be disabled\n");
} 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 = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
tz->trips.critical.temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
if (tz->trips.hot.flags.valid) {
if (!trip) {
*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
tz->trips.hot.temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
if (tz->trips.passive.flags.valid) {
if (!trip) {
*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
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 = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
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 = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
tz->trips.critical.temperature,
tz->kelvin_offset);
return 0;
} else
return -EINVAL;
}
static int thermal_get_trend(struct thermal_zone_device *thermal,
int trip, enum thermal_trend *trend)
{
struct acpi_thermal *tz = thermal->devdata;
enum thermal_trip_type type;
int i;
if (thermal_get_trip_type(thermal, trip, &type))
return -EINVAL;
if (type == THERMAL_TRIP_ACTIVE) {
unsigned long trip_temp;
unsigned long temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
tz->temperature, tz->kelvin_offset);
if (thermal_get_trip_temp(thermal, trip, &trip_temp))
return -EINVAL;
if (temp > trip_temp) {
*trend = THERMAL_TREND_RAISING;
return 0;
} else {
/* Fall back on default trend */
return -EINVAL;
}
}
/*
* tz->temperature has already been updated by generic thermal layer,
* before this callback being invoked
*/
i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
+ (tz->trips.passive.tc2
* (tz->temperature - tz->trips.passive.temperature));
if (i > 0)
*trend = THERMAL_TREND_RAISING;
else if (i < 0)
*trend = THERMAL_TREND_DROPPING;
else
*trend = THERMAL_TREND_STABLE;
return 0;
}
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_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;
}
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->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_FAILURE(status) || dev != device)
continue;
if (bind)
result =
thermal_zone_bind_cooling_device
(thermal, trip, cdev,
THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
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].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_FAILURE(status) || dev != device)
continue;
if (bind)
result = thermal_zone_bind_cooling_device
(thermal, trip, cdev,
THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
else
result = thermal_zone_unbind_cooling_device
(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)) {
if (bind)
result = thermal_zone_bind_cooling_device
(thermal, THERMAL_TRIPS_NONE,
cdev, THERMAL_NO_LIMIT,
THERMAL_NO_LIMIT);
else
result = thermal_zone_unbind_cooling_device
(thermal, THERMAL_TRIPS_NONE,
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_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,
.get_trend = thermal_get_trend,
.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, NULL,
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, NULL,
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_bus_attach_private_data(tz->device->handle,
tz->thermal_zone);
if (ACPI_FAILURE(status))
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_bus_detach_private_data(tz->device->handle);
}
/* --------------------------------------------------------------------------
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_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_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;
}
}
/*
* 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 = 0;
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) */
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 void acpi_thermal_check_fn(struct work_struct *work)
{
struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
thermal_check_work);
acpi_thermal_check(tz);
}
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;
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;
INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
pr_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)
{
struct acpi_thermal *tz = NULL;
if (!device || !acpi_driver_data(device))
return -EINVAL;
flush_workqueue(acpi_thermal_pm_queue);
tz = acpi_driver_data(device);
acpi_thermal_unregister_thermal_zone(tz);
kfree(tz);
return 0;
}
#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, 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;
}
queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
return AE_OK;
}
#endif
static int thermal_act(const struct dmi_system_id *d) {
if (act == 0) {
pr_notice(PREFIX "%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(PREFIX "%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) {
pr_notice(PREFIX "%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(PREFIX "%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) {
pr_notice(PREFIX "thermal control disabled\n");
return -ENODEV;
}
acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
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);
return;
}
module_init(acpi_thermal_init);
module_exit(acpi_thermal_exit);