thermal.c 47.6 KB
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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>
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#include <linux/dmi.h>
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#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
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#include <linux/timer.h>
#include <linux/jiffies.h>
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#include <linux/kmod.h>
#include <linux/seq_file.h>
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#include <linux/reboot.h>
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#include <asm/uaccess.h>
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#include <linux/thermal.h>
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#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_THERMAL_COMPONENT		0x04000000
#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
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ACPI_MODULE_NAME("thermal");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
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MODULE_LICENSE("GPL");

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static int act;
module_param(act, int, 0644);
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MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
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static int crt;
module_param(crt, int, 0644);
MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");

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static int tzp;
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module_param(tzp, int, 0444);
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MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
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static int nocrt;
module_param(nocrt, int, 0);
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MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
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static int off;
module_param(off, int, 0);
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MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
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static int psv;
module_param(psv, int, 0644);
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MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
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static int acpi_thermal_add(struct acpi_device *device);
static int acpi_thermal_remove(struct acpi_device *device, int type);
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static int acpi_thermal_resume(struct acpi_device *device);
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static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
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static ssize_t acpi_thermal_write_cooling_mode(struct file *,
					       const char __user *, size_t,
					       loff_t *);
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static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
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static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
					  size_t, loff_t *);
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static const struct acpi_device_id  thermal_device_ids[] = {
	{ACPI_THERMAL_HID, 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, thermal_device_ids);

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static struct acpi_driver acpi_thermal_driver = {
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	.name = "thermal",
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	.class = ACPI_THERMAL_CLASS,
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	.ids = thermal_device_ids,
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	.ops = {
		.add = acpi_thermal_add,
		.remove = acpi_thermal_remove,
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		.resume = acpi_thermal_resume,
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		},
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};

struct acpi_thermal_state {
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	u8 critical:1;
	u8 hot:1;
	u8 passive:1;
	u8 active:1;
	u8 reserved:4;
	int active_index;
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};

struct acpi_thermal_state_flags {
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	u8 valid:1;
	u8 enabled:1;
	u8 reserved:6;
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};

struct acpi_thermal_critical {
	struct acpi_thermal_state_flags flags;
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	unsigned long temperature;
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};

struct acpi_thermal_hot {
	struct acpi_thermal_state_flags flags;
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	unsigned long temperature;
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};

struct acpi_thermal_passive {
	struct acpi_thermal_state_flags flags;
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	unsigned long temperature;
	unsigned long tc1;
	unsigned long tc2;
	unsigned long tsp;
	struct acpi_handle_list devices;
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};

struct acpi_thermal_active {
	struct acpi_thermal_state_flags flags;
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	unsigned long temperature;
	struct acpi_handle_list devices;
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};

struct acpi_thermal_trips {
	struct acpi_thermal_critical critical;
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	struct acpi_thermal_hot hot;
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	struct acpi_thermal_passive passive;
	struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
};

struct acpi_thermal_flags {
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	u8 cooling_mode:1;	/* _SCP */
	u8 devices:1;		/* _TZD */
	u8 reserved:6;
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};

struct acpi_thermal {
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	struct acpi_device * device;
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	acpi_bus_id name;
	unsigned long temperature;
	unsigned long last_temperature;
	unsigned long polling_frequency;
	volatile u8 zombie;
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	struct acpi_thermal_flags flags;
	struct acpi_thermal_state state;
	struct acpi_thermal_trips trips;
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	struct acpi_handle_list devices;
	struct timer_list timer;
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	struct thermal_zone_device *thermal_zone;
	int tz_enabled;
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	struct mutex lock;
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};

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static const struct file_operations acpi_thermal_state_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_thermal_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};

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static const struct file_operations acpi_thermal_temp_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_thermal_temp_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};

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static const struct file_operations acpi_thermal_trip_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_thermal_trip_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};

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static const struct file_operations acpi_thermal_cooling_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_thermal_cooling_open_fs,
	.read = seq_read,
	.write = acpi_thermal_write_cooling_mode,
	.llseek = seq_lseek,
	.release = single_release,
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};

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static const struct file_operations acpi_thermal_polling_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_thermal_polling_open_fs,
	.read = seq_read,
	.write = acpi_thermal_write_polling,
	.llseek = seq_lseek,
	.release = single_release,
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};

/* --------------------------------------------------------------------------
                             Thermal Zone Management
   -------------------------------------------------------------------------- */

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static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
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{
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	acpi_status status = AE_OK;
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	if (!tz)
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		return -EINVAL;
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	tz->last_temperature = tz->temperature;

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	status =
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	    acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
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	if (ACPI_FAILURE(status))
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		return -ENODEV;
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	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
			  tz->temperature));
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	return 0;
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}

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static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
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{
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	acpi_status status = AE_OK;
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	if (!tz)
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		return -EINVAL;
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	status =
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	    acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
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				  &tz->polling_frequency);
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	if (ACPI_FAILURE(status))
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		return -ENODEV;
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	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
			  tz->polling_frequency));
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	return 0;
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}

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static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
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{

	if (!tz)
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		return -EINVAL;
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	tz->polling_frequency = seconds * 10;	/* Convert value to deci-seconds */

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	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Polling frequency set to %lu seconds\n",
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			  tz->polling_frequency/10));
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	return 0;
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}

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static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
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{
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	acpi_status status = AE_OK;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list arg_list = { 1, &arg0 };
	acpi_handle handle = NULL;
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	if (!tz)
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		return -EINVAL;
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	status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
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	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
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		return -ENODEV;
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	}

	arg0.integer.value = mode;

	status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
	if (ACPI_FAILURE(status))
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		return -ENODEV;
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	return 0;
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}

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#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
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#define ACPI_TRIPS_REFRESH_THRESHOLDS	(ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
#define ACPI_TRIPS_REFRESH_DEVICES	ACPI_TRIPS_DEVICES
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#define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |	\
			      ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |	\
			      ACPI_TRIPS_DEVICES)
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/*
 * 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;
	struct acpi_handle_list devices;
	int valid = 0;
	int i;
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	/* Critical Shutdown (required) */
	if (flag & ACPI_TRIPS_CRITICAL) {
		status = acpi_evaluate_integer(tz->device->handle,
				"_CRT", NULL, &tz->trips.critical.temperature);
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		/*
		 * Treat freezing temperatures as invalid as well; some
		 * BIOSes return really low values and cause reboots at startup.
		 * Below zero (Celcius) values clearly aren't right for sure..
		 * ... so lets discard those as invalid.
		 */
		if (ACPI_FAILURE(status) ||
				tz->trips.critical.temperature <= 2732) {
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			tz->trips.critical.flags.valid = 0;
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			ACPI_EXCEPTION((AE_INFO, status,
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					"No or invalid critical threshold"));
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			return -ENODEV;
		} 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 to lower critical threshold
				 */
				if (crt_k < tz->trips.critical.temperature)
					tz->trips.critical.temperature = crt_k;
			}
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		}
	}

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	/* Critical Sleep (optional) */
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	if (flag & ACPI_TRIPS_HOT) {
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		status = acpi_evaluate_integer(tz->device->handle,
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				"_HOT", NULL, &tz->trips.hot.temperature);
		if (ACPI_FAILURE(status)) {
			tz->trips.hot.flags.valid = 0;
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					"No hot threshold\n"));
		} else {
			tz->trips.hot.flags.valid = 1;
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					"Found hot threshold [%lu]\n",
					tz->trips.critical.temperature));
		}
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	}

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	/* Passive (optional) */
	if (flag & ACPI_TRIPS_PASSIVE) {
		valid = tz->trips.passive.flags.valid;
		if (psv == -1) {
			status = AE_SUPPORT;
		} else if (psv > 0) {
			tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
			status = AE_OK;
		} else {
			status = acpi_evaluate_integer(tz->device->handle,
				"_PSV", NULL, &tz->trips.passive.temperature);
		}
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		if (ACPI_FAILURE(status))
			tz->trips.passive.flags.valid = 0;
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		else {
			tz->trips.passive.flags.valid = 1;
			if (flag == ACPI_TRIPS_INIT) {
				status = acpi_evaluate_integer(
						tz->device->handle, "_TC1",
						NULL, &tz->trips.passive.tc1);
				if (ACPI_FAILURE(status))
					tz->trips.passive.flags.valid = 0;
				status = acpi_evaluate_integer(
						tz->device->handle, "_TC2",
						NULL, &tz->trips.passive.tc2);
				if (ACPI_FAILURE(status))
					tz->trips.passive.flags.valid = 0;
				status = acpi_evaluate_integer(
						tz->device->handle, "_TSP",
						NULL, &tz->trips.passive.tsp);
				if (ACPI_FAILURE(status))
					tz->trips.passive.flags.valid = 0;
			}
		}
	}
	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);
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		if (ACPI_FAILURE(status))
			tz->trips.passive.flags.valid = 0;
		else
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			tz->trips.passive.flags.valid = 1;
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		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");
	}
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	/* Active (optional) */
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	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
		char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
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		valid = tz->trips.active[i].flags.valid;
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		if (act == -1)
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			break; /* disable all active trip points */

		if (flag & ACPI_TRIPS_ACTIVE) {
			status = acpi_evaluate_integer(tz->device->handle,
				name, NULL, &tz->trips.active[i].temperature);
			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));
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				break;
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			} else
				tz->trips.active[i].flags.valid = 1;
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		}
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		name[2] = 'L';
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		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))
				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");
		}
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	}

544
	return 0;
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}

547
static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
L
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548
{
549
	return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
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550 551
}

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static int acpi_thermal_critical(struct acpi_thermal *tz)
L
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553
{
554
	if (!tz || !tz->trips.critical.flags.valid)
555
		return -EINVAL;
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556 557

	if (tz->temperature >= tz->trips.critical.temperature) {
558
		printk(KERN_WARNING PREFIX "Critical trip point\n");
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		tz->trips.critical.flags.enabled = 1;
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560
	} else if (tz->trips.critical.flags.enabled)
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		tz->trips.critical.flags.enabled = 0;

563
	acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
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				tz->trips.critical.flags.enabled);
565 566 567 568
	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
					  tz->device->dev.bus_id,
					  ACPI_THERMAL_NOTIFY_CRITICAL,
					  tz->trips.critical.flags.enabled);
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570 571 572 573 574 575 576
	/* take no action if nocrt is set */
	if(!nocrt) {
		printk(KERN_EMERG
			"Critical temperature reached (%ld C), shutting down.\n",
			KELVIN_TO_CELSIUS(tz->temperature));
		orderly_poweroff(true);
	}
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578
	return 0;
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}

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static int acpi_thermal_hot(struct acpi_thermal *tz)
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582
{
583
	if (!tz || !tz->trips.hot.flags.valid)
584
		return -EINVAL;
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	if (tz->temperature >= tz->trips.hot.temperature) {
587
		printk(KERN_WARNING PREFIX "Hot trip point\n");
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		tz->trips.hot.flags.enabled = 1;
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589
	} else if (tz->trips.hot.flags.enabled)
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		tz->trips.hot.flags.enabled = 0;

592
	acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
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				tz->trips.hot.flags.enabled);
594 595 596 597
	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
					  tz->device->dev.bus_id,
					  ACPI_THERMAL_NOTIFY_HOT,
					  tz->trips.hot.flags.enabled);
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599
	/* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
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600

601
	return 0;
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}

604
static void acpi_thermal_passive(struct acpi_thermal *tz)
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{
606
	int result = 1;
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	struct acpi_thermal_passive *passive = NULL;
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	int trend = 0;
	int i = 0;
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	if (!tz || !tz->trips.passive.flags.valid)
613
		return;
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	passive = &(tz->trips.passive);

	/*
	 * Above Trip?
	 * -----------
	 * Calculate the thermal trend (using the passive cooling equation)
	 * and modify the performance limit for all passive cooling devices
	 * accordingly.  Note that we assume symmetry.
	 */
	if (tz->temperature >= passive->temperature) {
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		trend =
		    (passive->tc1 * (tz->temperature - tz->last_temperature)) +
		    (passive->tc2 * (tz->temperature - passive->temperature));
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
				  trend, passive->tc1, tz->temperature,
				  tz->last_temperature, passive->tc2,
				  tz->temperature, passive->temperature));
633
		passive->flags.enabled = 1;
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		/* Heating up? */
		if (trend > 0)
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			for (i = 0; i < passive->devices.count; i++)
				acpi_processor_set_thermal_limit(passive->
								 devices.
								 handles[i],
								 ACPI_PROCESSOR_LIMIT_INCREMENT);
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		/* Cooling off? */
642
		else if (trend < 0) {
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			for (i = 0; i < passive->devices.count; i++)
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667
				/*
				 * assume that we are on highest
				 * freq/lowest thrott and can leave
				 * passive mode, even in error case
				 */
				if (!acpi_processor_set_thermal_limit
				    (passive->devices.handles[i],
				     ACPI_PROCESSOR_LIMIT_DECREMENT))
					result = 0;
			/*
			 * Leave cooling mode, even if the temp might
			 * higher than trip point This is because some
			 * machines might have long thermal polling
			 * frequencies (tsp) defined. We will fall back
			 * into passive mode in next cycle (probably quicker)
			 */
			if (result) {
				passive->flags.enabled = 0;
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "Disabling passive cooling, still above threshold,"
						  " but we are cooling down\n"));
			}
		}
		return;
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	}

	/*
	 * Below Trip?
	 * -----------
	 * Implement passive cooling hysteresis to slowly increase performance
	 * and avoid thrashing around the passive trip point.  Note that we
	 * assume symmetry.
	 */
677 678 679 680 681 682 683 684 685 686 687
	if (!passive->flags.enabled)
		return;
	for (i = 0; i < passive->devices.count; i++)
		if (!acpi_processor_set_thermal_limit
		    (passive->devices.handles[i],
		     ACPI_PROCESSOR_LIMIT_DECREMENT))
			result = 0;
	if (result) {
		passive->flags.enabled = 0;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Disabling passive cooling (zone is cool)\n"));
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	}
}

691
static void acpi_thermal_active(struct acpi_thermal *tz)
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692
{
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693
	int result = 0;
L
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694
	struct acpi_thermal_active *active = NULL;
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695 696 697
	int i = 0;
	int j = 0;
	unsigned long maxtemp = 0;
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	if (!tz)
701
		return;
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702

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703
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
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		active = &(tz->trips.active[i]);
		if (!active || !active->flags.valid)
			break;
		if (tz->temperature >= active->temperature) {
708 709 710 711 712 713
			/*
			 * Above Threshold?
			 * ----------------
			 * If not already enabled, turn ON all cooling devices
			 * associated with this active threshold.
			 */
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			if (active->temperature > maxtemp)
715 716 717 718
				tz->state.active_index = i;
			maxtemp = active->temperature;
			if (active->flags.enabled)
				continue;
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			for (j = 0; j < active->devices.count; j++) {
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				result =
				    acpi_bus_set_power(active->devices.
						       handles[j],
723
						       ACPI_STATE_D0);
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				if (result) {
725 726
					printk(KERN_WARNING PREFIX
						      "Unable to turn cooling device [%p] 'on'\n",
727
						      active->devices.
728
						      handles[j]);
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					continue;
				}
731
				active->flags.enabled = 1;
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				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
733
						  "Cooling device [%p] now 'on'\n",
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734
						  active->devices.handles[j]));
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735
			}
736 737 738 739 740 741 742 743 744 745 746 747 748 749
			continue;
		}
		if (!active->flags.enabled)
			continue;
		/*
		 * Below Threshold?
		 * ----------------
		 * Turn OFF all cooling devices associated with this
		 * threshold.
		 */
		for (j = 0; j < active->devices.count; j++) {
			result = acpi_bus_set_power(active->devices.handles[j],
						    ACPI_STATE_D3);
			if (result) {
750 751 752
				printk(KERN_WARNING PREFIX
					      "Unable to turn cooling device [%p] 'off'\n",
					      active->devices.handles[j]);
753 754 755 756 757 758
				continue;
			}
			active->flags.enabled = 0;
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Cooling device [%p] now 'off'\n",
					  active->devices.handles[j]));
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		}
	}
}

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static void acpi_thermal_check(void *context);
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764

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static void acpi_thermal_run(unsigned long data)
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{
	struct acpi_thermal *tz = (struct acpi_thermal *)data;
	if (!tz->zombie)
769
		acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
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}

772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
static void acpi_thermal_active_off(void *data)
{
	int result = 0;
	struct acpi_thermal *tz = data;
	int i = 0;
	int j = 0;
	struct acpi_thermal_active *active = NULL;

	if (!tz) {
		printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
		return;
	}

	result = acpi_thermal_get_temperature(tz);
	if (result)
		return;

	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
		active = &(tz->trips.active[i]);
		if (!active || !active->flags.valid)
			break;
		if (tz->temperature >= active->temperature) {
			/*
			 * If the thermal temperature is greater than the
			 * active threshod, unnecessary to turn off the
			 * the active cooling device.
			 */
			continue;
		}
		/*
		 * Below Threshold?
		 * ----------------
		 * Turn OFF all cooling devices associated with this
		 * threshold.
		 */
		for (j = 0; j < active->devices.count; j++)
			result = acpi_bus_set_power(active->devices.handles[j],
						    ACPI_STATE_D3);
	}
}

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static void acpi_thermal_check(void *data)
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814
{
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815
	int result = 0;
816
	struct acpi_thermal *tz = data;
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817
	unsigned long sleep_time = 0;
818
	unsigned long timeout_jiffies = 0;
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819
	int i = 0;
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	struct acpi_thermal_state state;


	if (!tz) {
824
		printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
825
		return;
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	}

828 829 830 831
	/* Check if someone else is already running */
	if (!mutex_trylock(&tz->lock))
		return;

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	state = tz->state;

	result = acpi_thermal_get_temperature(tz);
	if (result)
836
		goto unlock;
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838 839 840
	if (!tz->tz_enabled)
		goto unlock;

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841
	memset(&tz->state, 0, sizeof(tz->state));
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	/*
	 * Check Trip Points
	 * -----------------
	 * Compare the current temperature to the trip point values to see
	 * if we've entered one of the thermal policy states.  Note that
	 * this function determines when a state is entered, but the 
	 * individual policy decides when it is exited (e.g. hysteresis).
	 */
	if (tz->trips.critical.flags.valid)
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		state.critical |=
		    (tz->temperature >= tz->trips.critical.temperature);
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	if (tz->trips.hot.flags.valid)
		state.hot |= (tz->temperature >= tz->trips.hot.temperature);
	if (tz->trips.passive.flags.valid)
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		state.passive |=
		    (tz->temperature >= tz->trips.passive.temperature);
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
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860
		if (tz->trips.active[i].flags.valid)
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861 862 863
			state.active |=
			    (tz->temperature >=
			     tz->trips.active[i].temperature);
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	/*
	 * Invoke Policy
	 * -------------
	 * Separated from the above check to allow individual policy to 
	 * determine when to exit a given state.
	 */
	if (state.critical)
		acpi_thermal_critical(tz);
	if (state.hot)
		acpi_thermal_hot(tz);
	if (state.passive)
		acpi_thermal_passive(tz);
	if (state.active)
		acpi_thermal_active(tz);

	/*
	 * Calculate State
	 * ---------------
	 * Again, separated from the above two to allow independent policy
	 * decisions.
	 */
886 887 888 889
	tz->state.critical = tz->trips.critical.flags.enabled;
	tz->state.hot = tz->trips.hot.flags.enabled;
	tz->state.passive = tz->trips.passive.flags.enabled;
	tz->state.active = 0;
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	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
891
		tz->state.active |= tz->trips.active[i].flags.enabled;
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	/*
	 * Calculate Sleep Time
	 * --------------------
	 * If we're in the passive state, use _TSP's value.  Otherwise
	 * use the default polling frequency (e.g. _TZP).  If no polling
	 * frequency is specified then we'll wait forever (at least until
	 * a thermal event occurs).  Note that _TSP and _TZD values are
	 * given in 1/10th seconds (we must covert to milliseconds).
	 */
902
	if (tz->state.passive) {
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		sleep_time = tz->trips.passive.tsp * 100;
904 905
		timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
	} else if (tz->polling_frequency > 0) {
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906
		sleep_time = tz->polling_frequency * 100;
907 908
		timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
	}
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909

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	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
			  tz->name, tz->temperature, sleep_time));
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912 913 914 915 916 917 918 919

	/*
	 * Schedule Next Poll
	 * ------------------
	 */
	if (!sleep_time) {
		if (timer_pending(&(tz->timer)))
			del_timer(&(tz->timer));
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920
	} else {
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921
		if (timer_pending(&(tz->timer)))
922
			mod_timer(&(tz->timer), timeout_jiffies);
L
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923
		else {
L
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924
			tz->timer.data = (unsigned long)tz;
L
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925
			tz->timer.function = acpi_thermal_run;
926
			tz->timer.expires = timeout_jiffies;
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927 928 929
			add_timer(&(tz->timer));
		}
	}
930 931
      unlock:
	mutex_unlock(&tz->lock);
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}

934
/* sys I/F for generic thermal sysfs support */
935 936
#define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)

937 938 939
static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
{
	struct acpi_thermal *tz = thermal->devdata;
Z
Zhang, Rui 已提交
940
	int result;
941 942 943 944

	if (!tz)
		return -EINVAL;

Z
Zhang, Rui 已提交
945 946 947 948
	result = acpi_thermal_get_temperature(tz);
	if (result)
		return result;

949
	return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
}

static const char enabled[] = "kernel";
static const char disabled[] = "user";
static int thermal_get_mode(struct thermal_zone_device *thermal,
				char *buf)
{
	struct acpi_thermal *tz = thermal->devdata;

	if (!tz)
		return -EINVAL;

	return sprintf(buf, "%s\n", tz->tz_enabled ?
			enabled : disabled);
}

static int thermal_set_mode(struct thermal_zone_device *thermal,
				const char *buf)
{
	struct acpi_thermal *tz = thermal->devdata;
	int enable;

	if (!tz)
		return -EINVAL;

	/*
	 * enable/disable thermal management from ACPI thermal driver
	 */
	if (!strncmp(buf, enabled, sizeof enabled - 1))
		enable = 1;
	else if (!strncmp(buf, disabled, sizeof disabled - 1))
		enable = 0;
	else
		return -EINVAL;

	if (enable != tz->tz_enabled) {
		tz->tz_enabled = enable;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			"%s ACPI thermal control\n",
			tz->tz_enabled ? enabled : disabled));
		acpi_thermal_check(tz);
	}
	return 0;
}

static int thermal_get_trip_type(struct thermal_zone_device *thermal,
				 int trip, char *buf)
{
	struct acpi_thermal *tz = thermal->devdata;
	int i;

	if (!tz || trip < 0)
		return -EINVAL;

	if (tz->trips.critical.flags.valid) {
		if (!trip)
			return sprintf(buf, "critical\n");
		trip--;
	}

	if (tz->trips.hot.flags.valid) {
		if (!trip)
			return sprintf(buf, "hot\n");
		trip--;
	}

	if (tz->trips.passive.flags.valid) {
		if (!trip)
			return sprintf(buf, "passive\n");
		trip--;
	}

	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
		tz->trips.active[i].flags.valid; i++) {
		if (!trip)
			return sprintf(buf, "active%d\n", i);
		trip--;
	}

	return -EINVAL;
}

static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
				 int trip, char *buf)
{
	struct acpi_thermal *tz = thermal->devdata;
	int i;

	if (!tz || trip < 0)
		return -EINVAL;

	if (tz->trips.critical.flags.valid) {
		if (!trip)
1043
			return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1044 1045 1046 1047 1048 1049
				tz->trips.critical.temperature));
		trip--;
	}

	if (tz->trips.hot.flags.valid) {
		if (!trip)
1050
			return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1051 1052 1053 1054 1055 1056
					tz->trips.hot.temperature));
		trip--;
	}

	if (tz->trips.passive.flags.valid) {
		if (!trip)
1057
			return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1058 1059 1060 1061 1062 1063 1064
					tz->trips.passive.temperature));
		trip--;
	}

	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
		tz->trips.active[i].flags.valid; i++) {
		if (!trip)
1065
			return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1066 1067 1068 1069 1070 1071 1072
					tz->trips.active[i].temperature));
		trip--;
	}

	return -EINVAL;
}

1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
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);
		return 0;
	} else
		return -EINVAL;
}

1085 1086 1087 1088 1089 1090 1091 1092
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;
Z
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1093 1094 1095
	struct acpi_device *dev;
	acpi_status status;
	acpi_handle handle;
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
	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++) {
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1111 1112 1113 1114 1115 1116 1117
			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;
			}
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
		}
	}

	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++) {
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1128 1129 1130 1131 1132 1133 1134
			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;
			}
1135 1136 1137 1138
		}
	}

	for (i = 0; i < tz->devices.count; i++) {
Z
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1139 1140 1141 1142 1143 1144 1145
		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;
		}
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
	}

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 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,
1176
	.get_crit_temp = thermal_get_crit_temp,
1177 1178 1179 1180 1181 1182
};

static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
{
	int trips = 0;
	int result;
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1183
	acpi_status status;
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
	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++);
Z
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1197
	tz->thermal_zone = thermal_zone_device_register("acpitz",
1198
					trips, tz, &acpi_thermal_zone_ops);
K
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1199
	if (IS_ERR(tz->thermal_zone))
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
		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;

Z
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1212 1213 1214 1215 1216 1217 1218 1219 1220
	status = acpi_attach_data(tz->device->handle,
				  acpi_bus_private_data_handler,
				  tz->thermal_zone);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				"Error attaching device data\n"));
		return -ENODEV;
	}

1221 1222
	tz->tz_enabled = 1;

1223 1224
	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
		 tz->thermal_zone->id);
1225 1226 1227 1228 1229 1230 1231 1232 1233
	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;
Z
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1234
	acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1235 1236 1237
}


L
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1238 1239 1240 1241
/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

L
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1242
static struct proc_dir_entry *acpi_thermal_dir;
L
Linus Torvalds 已提交
1243 1244 1245

static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
{
1246
	struct acpi_thermal *tz = seq->private;
L
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1247 1248 1249 1250 1251 1252 1253


	if (!tz)
		goto end;

	seq_puts(seq, "state:                   ");

L
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1254 1255
	if (!tz->state.critical && !tz->state.hot && !tz->state.passive
	    && !tz->state.active)
L
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1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
		seq_puts(seq, "ok\n");
	else {
		if (tz->state.critical)
			seq_puts(seq, "critical ");
		if (tz->state.hot)
			seq_puts(seq, "hot ");
		if (tz->state.passive)
			seq_puts(seq, "passive ");
		if (tz->state.active)
			seq_printf(seq, "active[%d]", tz->state.active_index);
		seq_puts(seq, "\n");
	}

L
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1269
      end:
1270
	return 0;
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1271 1272 1273 1274 1275 1276 1277 1278 1279
}

static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
}

static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
{
L
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1280
	int result = 0;
1281
	struct acpi_thermal *tz = seq->private;
L
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1282 1283 1284 1285 1286 1287 1288 1289 1290


	if (!tz)
		goto end;

	result = acpi_thermal_get_temperature(tz);
	if (result)
		goto end;

L
Len Brown 已提交
1291 1292
	seq_printf(seq, "temperature:             %ld C\n",
		   KELVIN_TO_CELSIUS(tz->temperature));
L
Linus Torvalds 已提交
1293

L
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1294
      end:
1295
	return 0;
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1296 1297 1298 1299 1300 1301 1302 1303 1304
}

static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
}

static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
{
1305
	struct acpi_thermal *tz = seq->private;
1306
	struct acpi_device *device;
1307 1308
	acpi_status status;

L
Len Brown 已提交
1309 1310
	int i = 0;
	int j = 0;
L
Linus Torvalds 已提交
1311 1312 1313 1314 1315 1316


	if (!tz)
		goto end;

	if (tz->trips.critical.flags.valid)
1317 1318 1319
		seq_printf(seq, "critical (S5):           %ld C%s",
			   KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
			   nocrt ? " <disabled>\n" : "\n");
L
Linus Torvalds 已提交
1320 1321

	if (tz->trips.hot.flags.valid)
1322 1323 1324
		seq_printf(seq, "hot (S4):                %ld C%s",
			   KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
			   nocrt ? " <disabled>\n" : "\n");
L
Linus Torvalds 已提交
1325 1326

	if (tz->trips.passive.flags.valid) {
L
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1327 1328 1329 1330 1331 1332
		seq_printf(seq,
			   "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
			   KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
			   tz->trips.passive.tc1, tz->trips.passive.tc2,
			   tz->trips.passive.tsp);
		for (j = 0; j < tz->trips.passive.devices.count; j++) {
1333 1334 1335 1336
			status = acpi_bus_get_device(tz->trips.passive.devices.
						     handles[j], &device);
			seq_printf(seq, "%4.4s ", status ? "" :
				   acpi_device_bid(device));
L
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1337 1338 1339 1340 1341 1342 1343 1344
		}
		seq_puts(seq, "\n");
	}

	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
		if (!(tz->trips.active[i].flags.valid))
			break;
		seq_printf(seq, "active[%d]:               %ld C: devices=",
L
Len Brown 已提交
1345 1346
			   i,
			   KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1347
		for (j = 0; j < tz->trips.active[i].devices.count; j++){
1348 1349 1350 1351 1352
			status = acpi_bus_get_device(tz->trips.active[i].
						     devices.handles[j],
						     &device);
			seq_printf(seq, "%4.4s ", status ? "" :
				   acpi_device_bid(device));
1353
		}
L
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1354 1355 1356
		seq_puts(seq, "\n");
	}

L
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1357
      end:
1358
	return 0;
L
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1359 1360 1361 1362 1363 1364 1365 1366 1367
}

static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
}

static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
{
1368
	struct acpi_thermal *tz = seq->private;
L
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1369 1370 1371 1372 1373


	if (!tz)
		goto end;

1374
	if (!tz->flags.cooling_mode)
L
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1375 1376
		seq_puts(seq, "<setting not supported>\n");
	else
1377
		seq_puts(seq, "0 - Active; 1 - Passive\n");
L
Linus Torvalds 已提交
1378

L
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1379
      end:
1380
	return 0;
L
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1381 1382 1383 1384 1385
}

static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_cooling_seq_show,
L
Len Brown 已提交
1386
			   PDE(inode)->data);
L
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1387 1388 1389
}

static ssize_t
L
Len Brown 已提交
1390 1391 1392
acpi_thermal_write_cooling_mode(struct file *file,
				const char __user * buffer,
				size_t count, loff_t * ppos)
L
Linus Torvalds 已提交
1393
{
1394 1395
	struct seq_file *m = file->private_data;
	struct acpi_thermal *tz = m->private;
L
Len Brown 已提交
1396 1397
	int result = 0;
	char mode_string[12] = { '\0' };
L
Linus Torvalds 已提交
1398 1399 1400


	if (!tz || (count > sizeof(mode_string) - 1))
1401
		return -EINVAL;
L
Linus Torvalds 已提交
1402 1403

	if (!tz->flags.cooling_mode)
1404
		return -ENODEV;
L
Linus Torvalds 已提交
1405 1406

	if (copy_from_user(mode_string, buffer, count))
1407
		return -EFAULT;
L
Len Brown 已提交
1408

L
Linus Torvalds 已提交
1409
	mode_string[count] = '\0';
L
Len Brown 已提交
1410 1411 1412 1413

	result = acpi_thermal_set_cooling_mode(tz,
					       simple_strtoul(mode_string, NULL,
							      0));
L
Linus Torvalds 已提交
1414
	if (result)
1415
		return result;
L
Linus Torvalds 已提交
1416 1417 1418

	acpi_thermal_check(tz);

1419
	return count;
L
Linus Torvalds 已提交
1420 1421 1422 1423
}

static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
{
1424
	struct acpi_thermal *tz = seq->private;
L
Linus Torvalds 已提交
1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435


	if (!tz)
		goto end;

	if (!tz->polling_frequency) {
		seq_puts(seq, "<polling disabled>\n");
		goto end;
	}

	seq_printf(seq, "polling frequency:       %lu seconds\n",
L
Len Brown 已提交
1436
		   (tz->polling_frequency / 10));
L
Linus Torvalds 已提交
1437

L
Len Brown 已提交
1438
      end:
1439
	return 0;
L
Linus Torvalds 已提交
1440 1441 1442 1443 1444
}

static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_polling_seq_show,
L
Len Brown 已提交
1445
			   PDE(inode)->data);
L
Linus Torvalds 已提交
1446 1447 1448
}

static ssize_t
L
Len Brown 已提交
1449 1450 1451
acpi_thermal_write_polling(struct file *file,
			   const char __user * buffer,
			   size_t count, loff_t * ppos)
L
Linus Torvalds 已提交
1452
{
1453 1454
	struct seq_file *m = file->private_data;
	struct acpi_thermal *tz = m->private;
L
Len Brown 已提交
1455 1456 1457
	int result = 0;
	char polling_string[12] = { '\0' };
	int seconds = 0;
L
Linus Torvalds 已提交
1458 1459 1460


	if (!tz || (count > sizeof(polling_string) - 1))
1461
		return -EINVAL;
L
Len Brown 已提交
1462

L
Linus Torvalds 已提交
1463
	if (copy_from_user(polling_string, buffer, count))
1464
		return -EFAULT;
L
Len Brown 已提交
1465

L
Linus Torvalds 已提交
1466 1467 1468
	polling_string[count] = '\0';

	seconds = simple_strtoul(polling_string, NULL, 0);
L
Len Brown 已提交
1469

L
Linus Torvalds 已提交
1470 1471
	result = acpi_thermal_set_polling(tz, seconds);
	if (result)
1472
		return result;
L
Linus Torvalds 已提交
1473 1474 1475

	acpi_thermal_check(tz);

1476
	return count;
L
Linus Torvalds 已提交
1477 1478
}

L
Len Brown 已提交
1479
static int acpi_thermal_add_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
1480
{
L
Len Brown 已提交
1481
	struct proc_dir_entry *entry = NULL;
L
Linus Torvalds 已提交
1482 1483 1484 1485


	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
L
Len Brown 已提交
1486
						     acpi_thermal_dir);
L
Linus Torvalds 已提交
1487
		if (!acpi_device_dir(device))
1488
			return -ENODEV;
L
Linus Torvalds 已提交
1489 1490 1491 1492
		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'state' [R] */
1493 1494 1495 1496
	entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
				 S_IRUGO, acpi_device_dir(device),
				 &acpi_thermal_state_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1497
	if (!entry)
1498
		return -ENODEV;
L
Linus Torvalds 已提交
1499 1500

	/* 'temperature' [R] */
1501 1502 1503 1504
	entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
				 S_IRUGO, acpi_device_dir(device),
				 &acpi_thermal_temp_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1505
	if (!entry)
1506
		return -ENODEV;
L
Linus Torvalds 已提交
1507

1508
	/* 'trip_points' [R] */
1509 1510 1511 1512 1513
	entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
				 S_IRUGO,
				 acpi_device_dir(device),
				 &acpi_thermal_trip_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1514
	if (!entry)
1515
		return -ENODEV;
L
Linus Torvalds 已提交
1516 1517

	/* 'cooling_mode' [R/W] */
1518 1519 1520 1521 1522
	entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
				 S_IFREG | S_IRUGO | S_IWUSR,
				 acpi_device_dir(device),
				 &acpi_thermal_cooling_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1523
	if (!entry)
1524
		return -ENODEV;
L
Linus Torvalds 已提交
1525 1526

	/* 'polling_frequency' [R/W] */
1527 1528 1529 1530 1531
	entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
				 S_IFREG | S_IRUGO | S_IWUSR,
				 acpi_device_dir(device),
				 &acpi_thermal_polling_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1532
	if (!entry)
1533 1534
		return -ENODEV;
	return 0;
L
Linus Torvalds 已提交
1535 1536
}

L
Len Brown 已提交
1537
static int acpi_thermal_remove_fs(struct acpi_device *device)
L
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1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554
{

	if (acpi_device_dir(device)) {
		remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_STATE,
				  acpi_device_dir(device));
		remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
		acpi_device_dir(device) = NULL;
	}

1555
	return 0;
L
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1556 1557 1558 1559 1560 1561
}

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
1562
static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
L
Linus Torvalds 已提交
1563
{
1564
	struct acpi_thermal *tz = data;
L
Len Brown 已提交
1565
	struct acpi_device *device = NULL;
L
Linus Torvalds 已提交
1566 1567 1568


	if (!tz)
1569
		return;
L
Linus Torvalds 已提交
1570

1571
	device = tz->device;
L
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1572 1573 1574 1575 1576 1577

	switch (event) {
	case ACPI_THERMAL_NOTIFY_TEMPERATURE:
		acpi_thermal_check(tz);
		break;
	case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1578
		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
L
Linus Torvalds 已提交
1579
		acpi_thermal_check(tz);
1580
		acpi_bus_generate_proc_event(device, event, 0);
1581 1582
		acpi_bus_generate_netlink_event(device->pnp.device_class,
						  device->dev.bus_id, event, 0);
L
Linus Torvalds 已提交
1583 1584
		break;
	case ACPI_THERMAL_NOTIFY_DEVICES:
1585 1586
		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
		acpi_thermal_check(tz);
1587
		acpi_bus_generate_proc_event(device, event, 0);
1588 1589
		acpi_bus_generate_netlink_event(device->pnp.device_class,
						  device->dev.bus_id, event, 0);
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1590 1591 1592
		break;
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
L
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1593
				  "Unsupported event [0x%x]\n", event));
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1594 1595 1596
		break;
	}

1597
	return;
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1598 1599
}

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1600
static int acpi_thermal_get_info(struct acpi_thermal *tz)
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1601
{
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1602
	int result = 0;
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1603 1604 1605


	if (!tz)
1606
		return -EINVAL;
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1607 1608 1609 1610

	/* Get temperature [_TMP] (required) */
	result = acpi_thermal_get_temperature(tz);
	if (result)
1611
		return result;
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1612 1613 1614 1615

	/* Get trip points [_CRT, _PSV, etc.] (required) */
	result = acpi_thermal_get_trip_points(tz);
	if (result)
1616
		return result;
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	/* Set the cooling mode [_SCP] to active cooling (default) */
	result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
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	if (!result)
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1621 1622 1623 1624 1625 1626 1627 1628
		tz->flags.cooling_mode = 1;

	/* Get default polling frequency [_TZP] (optional) */
	if (tzp)
		tz->polling_frequency = tzp;
	else
		acpi_thermal_get_polling_frequency(tz);

1629
	return 0;
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1630 1631
}

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1632
static int acpi_thermal_add(struct acpi_device *device)
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1633
{
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1634 1635 1636
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_thermal *tz = NULL;
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1637 1638 1639


	if (!device)
1640
		return -EINVAL;
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1641

1642
	tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
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1643
	if (!tz)
1644
		return -ENOMEM;
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1645

1646
	tz->device = device;
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	strcpy(tz->name, device->pnp.bus_id);
	strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
	acpi_driver_data(device) = tz;
1651
	mutex_init(&tz->lock);
1652 1653


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	result = acpi_thermal_get_info(tz);
	if (result)
1656 1657 1658 1659 1660
		goto free_memory;

	result = acpi_thermal_register_thermal_zone(tz);
	if (result)
		goto free_memory;
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1661 1662 1663

	result = acpi_thermal_add_fs(device);
	if (result)
1664
		goto unregister_thermal_zone;
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1665 1666 1667

	init_timer(&tz->timer);

1668 1669
	acpi_thermal_active_off(tz);

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1670 1671
	acpi_thermal_check(tz);

1672
	status = acpi_install_notify_handler(device->handle,
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1673 1674
					     ACPI_DEVICE_NOTIFY,
					     acpi_thermal_notify, tz);
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1675 1676
	if (ACPI_FAILURE(status)) {
		result = -ENODEV;
1677
		goto remove_fs;
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	}

	printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
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1681 1682
	       acpi_device_name(device), acpi_device_bid(device),
	       KELVIN_TO_CELSIUS(tz->temperature));
1683
	goto end;
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1684

1685 1686 1687 1688 1689 1690 1691
remove_fs:
	acpi_thermal_remove_fs(device);
unregister_thermal_zone:
	thermal_zone_device_unregister(tz->thermal_zone);
free_memory:
	kfree(tz);
end:
1692
	return result;
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}

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1695
static int acpi_thermal_remove(struct acpi_device *device, int type)
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1696
{
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1697 1698
	acpi_status status = AE_OK;
	struct acpi_thermal *tz = NULL;
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1699 1700 1701


	if (!device || !acpi_driver_data(device))
1702
		return -EINVAL;
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1703

1704
	tz = acpi_driver_data(device);
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	/* avoid timer adding new defer task */
	tz->zombie = 1;
	/* wait for running timer (on other CPUs) finish */
	del_timer_sync(&(tz->timer));
	/* synchronize deferred task */
	acpi_os_wait_events_complete(NULL);
	/* deferred task may reinsert timer */
	del_timer_sync(&(tz->timer));

1715
	status = acpi_remove_notify_handler(device->handle,
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					    ACPI_DEVICE_NOTIFY,
					    acpi_thermal_notify);
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1718 1719

	/* Terminate policy */
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1720
	if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
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		tz->trips.passive.flags.enabled = 0;
		acpi_thermal_passive(tz);
	}
	if (tz->trips.active[0].flags.valid
L
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1725
	    && tz->trips.active[0].flags.enabled) {
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		tz->trips.active[0].flags.enabled = 0;
		acpi_thermal_active(tz);
	}

	acpi_thermal_remove_fs(device);
1731
	acpi_thermal_unregister_thermal_zone(tz);
1732
	mutex_destroy(&tz->lock);
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1733
	kfree(tz);
1734
	return 0;
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1735 1736
}

1737
static int acpi_thermal_resume(struct acpi_device *device)
1738 1739
{
	struct acpi_thermal *tz = NULL;
1740 1741
	int i, j, power_state, result;

1742 1743

	if (!device || !acpi_driver_data(device))
1744
		return -EINVAL;
1745

1746
	tz = acpi_driver_data(device);
1747

1748
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760
		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_get_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;
			}
1761
		}
1762
		tz->state.active |= tz->trips.active[i].flags.enabled;
1763 1764
	}

1765
	acpi_thermal_check(tz);
1766 1767 1768 1769

	return AE_OK;
}

1770
static int thermal_act(const struct dmi_system_id *d) {
1771 1772 1773 1774 1775 1776 1777 1778

	if (act == 0) {
		printk(KERN_NOTICE "ACPI: %s detected: "
			"disabling all active thermal trip points\n", d->ident);
		act = -1;
	}
	return 0;
}
1779
static int thermal_nocrt(const struct dmi_system_id *d) {
1780 1781 1782 1783 1784 1785

	printk(KERN_NOTICE "ACPI: %s detected: "
		"disabling all critical thermal trip point actions.\n", d->ident);
	nocrt = 1;
	return 0;
}
1786
static int thermal_tzp(const struct dmi_system_id *d) {
1787 1788 1789 1790 1791 1792 1793 1794

	if (tzp == 0) {
		printk(KERN_NOTICE "ACPI: %s detected: "
			"enabling thermal zone polling\n", d->ident);
		tzp = 300;	/* 300 dS = 30 Seconds */
	}
	return 0;
}
1795
static int thermal_psv(const struct dmi_system_id *d) {
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833

	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"),
		},
	},
1834 1835 1836 1837 1838 1839 1840 1841
	{
	 .callback = thermal_nocrt,
	 .ident = "Gigabyte GA-7ZX",
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
		DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
		},
	},
1842 1843 1844
	{}
};

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1845
static int __init acpi_thermal_init(void)
L
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1846
{
L
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1847
	int result = 0;
L
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1848

1849 1850
	dmi_check_system(thermal_dmi_table);

1851 1852 1853 1854
	if (off) {
		printk(KERN_NOTICE "ACPI: thermal control disabled\n");
		return -ENODEV;
	}
L
Linus Torvalds 已提交
1855 1856
	acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
	if (!acpi_thermal_dir)
1857
		return -ENODEV;
L
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1858 1859 1860 1861 1862
	acpi_thermal_dir->owner = THIS_MODULE;

	result = acpi_bus_register_driver(&acpi_thermal_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1863
		return -ENODEV;
L
Linus Torvalds 已提交
1864 1865
	}

1866
	return 0;
L
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1867 1868
}

L
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1869
static void __exit acpi_thermal_exit(void)
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1870 1871 1872 1873 1874 1875
{

	acpi_bus_unregister_driver(&acpi_thermal_driver);

	remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);

1876
	return;
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1877 1878 1879 1880
}

module_init(acpi_thermal_init);
module_exit(acpi_thermal_exit);