thermal_sys.c 35.8 KB
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/*
 *  thermal.c - Generic Thermal Management Sysfs support.
 *
 *  Copyright (C) 2008 Intel Corp
 *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@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; version 2 of the License.
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/kdev_t.h>
#include <linux/idr.h>
#include <linux/thermal.h>
#include <linux/spinlock.h>
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#include <linux/reboot.h>
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#include <net/netlink.h>
#include <net/genetlink.h>
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MODULE_AUTHOR("Zhang Rui");
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MODULE_DESCRIPTION("Generic thermal management sysfs support");
MODULE_LICENSE("GPL");

#define PREFIX "Thermal: "

struct thermal_cooling_device_instance {
	int id;
	char name[THERMAL_NAME_LENGTH];
	struct thermal_zone_device *tz;
	struct thermal_cooling_device *cdev;
	int trip;
	char attr_name[THERMAL_NAME_LENGTH];
	struct device_attribute attr;
	struct list_head node;
};

static DEFINE_IDR(thermal_tz_idr);
static DEFINE_IDR(thermal_cdev_idr);
static DEFINE_MUTEX(thermal_idr_lock);

static LIST_HEAD(thermal_tz_list);
static LIST_HEAD(thermal_cdev_list);
static DEFINE_MUTEX(thermal_list_lock);

static int get_idr(struct idr *idr, struct mutex *lock, int *id)
{
	int err;

      again:
	if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
		return -ENOMEM;

	if (lock)
		mutex_lock(lock);
	err = idr_get_new(idr, NULL, id);
	if (lock)
		mutex_unlock(lock);
	if (unlikely(err == -EAGAIN))
		goto again;
	else if (unlikely(err))
		return err;

	*id = *id & MAX_ID_MASK;
	return 0;
}

static void release_idr(struct idr *idr, struct mutex *lock, int id)
{
	if (lock)
		mutex_lock(lock);
	idr_remove(idr, id);
	if (lock)
		mutex_unlock(lock);
}

/* sys I/F for thermal zone */

#define to_thermal_zone(_dev) \
	container_of(_dev, struct thermal_zone_device, device)

static ssize_t
type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);

	return sprintf(buf, "%s\n", tz->type);
}

static ssize_t
temp_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
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	long temperature;
	int ret;
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	if (!tz->ops->get_temp)
		return -EPERM;

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	ret = tz->ops->get_temp(tz, &temperature);

	if (ret)
		return ret;

	return sprintf(buf, "%ld\n", temperature);
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}

static ssize_t
mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
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	enum thermal_device_mode mode;
	int result;
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	if (!tz->ops->get_mode)
		return -EPERM;

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	result = tz->ops->get_mode(tz, &mode);
	if (result)
		return result;

	return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
		       : "disabled");
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}

static ssize_t
mode_store(struct device *dev, struct device_attribute *attr,
	   const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int result;

	if (!tz->ops->set_mode)
		return -EPERM;

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	if (!strncmp(buf, "enabled", sizeof("enabled")))
		result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
	else if (!strncmp(buf, "disabled", sizeof("disabled")))
		result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
	else
		result = -EINVAL;

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	if (result)
		return result;

	return count;
}

static ssize_t
trip_point_type_show(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
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	enum thermal_trip_type type;
	int trip, result;
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	if (!tz->ops->get_trip_type)
		return -EPERM;

	if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
		return -EINVAL;

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	result = tz->ops->get_trip_type(tz, trip, &type);
	if (result)
		return result;

	switch (type) {
	case THERMAL_TRIP_CRITICAL:
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		return sprintf(buf, "critical\n");
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	case THERMAL_TRIP_HOT:
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		return sprintf(buf, "hot\n");
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	case THERMAL_TRIP_PASSIVE:
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		return sprintf(buf, "passive\n");
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	case THERMAL_TRIP_ACTIVE:
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		return sprintf(buf, "active\n");
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	default:
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		return sprintf(buf, "unknown\n");
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	}
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}

static ssize_t
trip_point_temp_show(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
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	int trip, ret;
	long temperature;
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	if (!tz->ops->get_trip_temp)
		return -EPERM;

	if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
		return -EINVAL;

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	ret = tz->ops->get_trip_temp(tz, trip, &temperature);

	if (ret)
		return ret;

	return sprintf(buf, "%ld\n", temperature);
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}

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static ssize_t
passive_store(struct device *dev, struct device_attribute *attr,
		    const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	struct thermal_cooling_device *cdev = NULL;
	int state;

	if (!sscanf(buf, "%d\n", &state))
		return -EINVAL;

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	/* sanity check: values below 1000 millicelcius don't make sense
	 * and can cause the system to go into a thermal heart attack
	 */
	if (state && state < 1000)
		return -EINVAL;

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	if (state && !tz->forced_passive) {
		mutex_lock(&thermal_list_lock);
		list_for_each_entry(cdev, &thermal_cdev_list, node) {
			if (!strncmp("Processor", cdev->type,
				     sizeof("Processor")))
				thermal_zone_bind_cooling_device(tz,
								 THERMAL_TRIPS_NONE,
								 cdev);
		}
		mutex_unlock(&thermal_list_lock);
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		if (!tz->passive_delay)
			tz->passive_delay = 1000;
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	} else if (!state && tz->forced_passive) {
		mutex_lock(&thermal_list_lock);
		list_for_each_entry(cdev, &thermal_cdev_list, node) {
			if (!strncmp("Processor", cdev->type,
				     sizeof("Processor")))
				thermal_zone_unbind_cooling_device(tz,
								   THERMAL_TRIPS_NONE,
								   cdev);
		}
		mutex_unlock(&thermal_list_lock);
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		tz->passive_delay = 0;
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	}

	tz->tc1 = 1;
	tz->tc2 = 1;

	tz->forced_passive = state;

	thermal_zone_device_update(tz);

	return count;
}

static ssize_t
passive_show(struct device *dev, struct device_attribute *attr,
		   char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);

	return sprintf(buf, "%d\n", tz->forced_passive);
}

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static DEVICE_ATTR(type, 0444, type_show, NULL);
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
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static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
		   passive_store);
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static struct device_attribute trip_point_attrs[] = {
	__ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
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	__ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
	__ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
	__ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
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};

#define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
do {    \
	result = device_create_file(_dev,	\
				&trip_point_attrs[_index * 2]);	\
	if (result)	\
		break;	\
	result = device_create_file(_dev,	\
			&trip_point_attrs[_index * 2 + 1]);	\
} while (0)

#define TRIP_POINT_ATTR_REMOVE(_dev, _index)	\
do {	\
	device_remove_file(_dev, &trip_point_attrs[_index * 2]);	\
	device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);	\
} while (0)

/* sys I/F for cooling device */
#define to_cooling_device(_dev)	\
	container_of(_dev, struct thermal_cooling_device, device)

static ssize_t
thermal_cooling_device_type_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct thermal_cooling_device *cdev = to_cooling_device(dev);

	return sprintf(buf, "%s\n", cdev->type);
}

static ssize_t
thermal_cooling_device_max_state_show(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct thermal_cooling_device *cdev = to_cooling_device(dev);
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	unsigned long state;
	int ret;
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	ret = cdev->ops->get_max_state(cdev, &state);
	if (ret)
		return ret;
	return sprintf(buf, "%ld\n", state);
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}

static ssize_t
thermal_cooling_device_cur_state_show(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct thermal_cooling_device *cdev = to_cooling_device(dev);
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	unsigned long state;
	int ret;
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	ret = cdev->ops->get_cur_state(cdev, &state);
	if (ret)
		return ret;
	return sprintf(buf, "%ld\n", state);
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}

static ssize_t
thermal_cooling_device_cur_state_store(struct device *dev,
				       struct device_attribute *attr,
				       const char *buf, size_t count)
{
	struct thermal_cooling_device *cdev = to_cooling_device(dev);
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	unsigned long state;
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	int result;

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	if (!sscanf(buf, "%ld\n", &state))
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		return -EINVAL;

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	if ((long)state < 0)
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		return -EINVAL;

	result = cdev->ops->set_cur_state(cdev, state);
	if (result)
		return result;
	return count;
}

static struct device_attribute dev_attr_cdev_type =
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__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
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static DEVICE_ATTR(max_state, 0444,
		   thermal_cooling_device_max_state_show, NULL);
static DEVICE_ATTR(cur_state, 0644,
		   thermal_cooling_device_cur_state_show,
		   thermal_cooling_device_cur_state_store);

static ssize_t
thermal_cooling_device_trip_point_show(struct device *dev,
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				       struct device_attribute *attr, char *buf)
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{
	struct thermal_cooling_device_instance *instance;

	instance =
	    container_of(attr, struct thermal_cooling_device_instance, attr);

	if (instance->trip == THERMAL_TRIPS_NONE)
		return sprintf(buf, "-1\n");
	else
		return sprintf(buf, "%d\n", instance->trip);
}

/* Device management */

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#if defined(CONFIG_THERMAL_HWMON)

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/* hwmon sys I/F */
#include <linux/hwmon.h>
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/* thermal zone devices with the same type share one hwmon device */
struct thermal_hwmon_device {
	char type[THERMAL_NAME_LENGTH];
	struct device *device;
	int count;
	struct list_head tz_list;
	struct list_head node;
};

struct thermal_hwmon_attr {
	struct device_attribute attr;
	char name[16];
};

/* one temperature input for each thermal zone */
struct thermal_hwmon_temp {
	struct list_head hwmon_node;
	struct thermal_zone_device *tz;
	struct thermal_hwmon_attr temp_input;	/* hwmon sys attr */
	struct thermal_hwmon_attr temp_crit;	/* hwmon sys attr */
};

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static LIST_HEAD(thermal_hwmon_list);

static ssize_t
name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
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	struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
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	return sprintf(buf, "%s\n", hwmon->type);
}
static DEVICE_ATTR(name, 0444, name_show, NULL);

static ssize_t
temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
{
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	long temperature;
	int ret;
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	struct thermal_hwmon_attr *hwmon_attr
			= container_of(attr, struct thermal_hwmon_attr, attr);
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	struct thermal_hwmon_temp *temp
			= container_of(hwmon_attr, struct thermal_hwmon_temp,
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				       temp_input);
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	struct thermal_zone_device *tz = temp->tz;
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	ret = tz->ops->get_temp(tz, &temperature);

	if (ret)
		return ret;

	return sprintf(buf, "%ld\n", temperature);
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}

static ssize_t
temp_crit_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct thermal_hwmon_attr *hwmon_attr
			= container_of(attr, struct thermal_hwmon_attr, attr);
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	struct thermal_hwmon_temp *temp
			= container_of(hwmon_attr, struct thermal_hwmon_temp,
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				       temp_crit);
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	struct thermal_zone_device *tz = temp->tz;
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	long temperature;
	int ret;

	ret = tz->ops->get_trip_temp(tz, 0, &temperature);
	if (ret)
		return ret;
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	return sprintf(buf, "%ld\n", temperature);
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}


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static struct thermal_hwmon_device *
thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
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{
	struct thermal_hwmon_device *hwmon;

	mutex_lock(&thermal_list_lock);
	list_for_each_entry(hwmon, &thermal_hwmon_list, node)
		if (!strcmp(hwmon->type, tz->type)) {
			mutex_unlock(&thermal_list_lock);
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			return hwmon;
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		}
	mutex_unlock(&thermal_list_lock);

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	return NULL;
}

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/* Find the temperature input matching a given thermal zone */
static struct thermal_hwmon_temp *
thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
			  const struct thermal_zone_device *tz)
{
	struct thermal_hwmon_temp *temp;

	mutex_lock(&thermal_list_lock);
	list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
		if (temp->tz == tz) {
			mutex_unlock(&thermal_list_lock);
			return temp;
		}
	mutex_unlock(&thermal_list_lock);

	return NULL;
}

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static int
thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
{
	struct thermal_hwmon_device *hwmon;
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	struct thermal_hwmon_temp *temp;
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	int new_hwmon_device = 1;
	int result;

	hwmon = thermal_hwmon_lookup_by_type(tz);
	if (hwmon) {
		new_hwmon_device = 0;
		goto register_sys_interface;
	}

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	hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
	if (!hwmon)
		return -ENOMEM;

	INIT_LIST_HEAD(&hwmon->tz_list);
	strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
	hwmon->device = hwmon_device_register(NULL);
	if (IS_ERR(hwmon->device)) {
		result = PTR_ERR(hwmon->device);
		goto free_mem;
	}
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	dev_set_drvdata(hwmon->device, hwmon);
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	result = device_create_file(hwmon->device, &dev_attr_name);
	if (result)
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		goto free_mem;
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 register_sys_interface:
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	temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
	if (!temp) {
		result = -ENOMEM;
		goto unregister_name;
	}

	temp->tz = tz;
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	hwmon->count++;

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	snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
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		 "temp%d_input", hwmon->count);
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	temp->temp_input.attr.attr.name = temp->temp_input.name;
	temp->temp_input.attr.attr.mode = 0444;
	temp->temp_input.attr.show = temp_input_show;
	sysfs_attr_init(&temp->temp_input.attr.attr);
	result = device_create_file(hwmon->device, &temp->temp_input.attr);
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	if (result)
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		goto free_temp_mem;
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	if (tz->ops->get_crit_temp) {
		unsigned long temperature;
		if (!tz->ops->get_crit_temp(tz, &temperature)) {
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			snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
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				"temp%d_crit", hwmon->count);
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			temp->temp_crit.attr.attr.name = temp->temp_crit.name;
			temp->temp_crit.attr.attr.mode = 0444;
			temp->temp_crit.attr.show = temp_crit_show;
			sysfs_attr_init(&temp->temp_crit.attr.attr);
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			result = device_create_file(hwmon->device,
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						    &temp->temp_crit.attr);
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			if (result)
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				goto unregister_input;
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		}
	}

	mutex_lock(&thermal_list_lock);
	if (new_hwmon_device)
		list_add_tail(&hwmon->node, &thermal_hwmon_list);
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	list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
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	mutex_unlock(&thermal_list_lock);

	return 0;

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 unregister_input:
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	device_remove_file(hwmon->device, &temp->temp_input.attr);
 free_temp_mem:
	kfree(temp);
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 unregister_name:
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	if (new_hwmon_device) {
		device_remove_file(hwmon->device, &dev_attr_name);
		hwmon_device_unregister(hwmon->device);
	}
 free_mem:
	if (new_hwmon_device)
		kfree(hwmon);

	return result;
}

static void
thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
{
622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637
	struct thermal_hwmon_device *hwmon;
	struct thermal_hwmon_temp *temp;

	hwmon = thermal_hwmon_lookup_by_type(tz);
	if (unlikely(!hwmon)) {
		/* Should never happen... */
		dev_dbg(&tz->device, "hwmon device lookup failed!\n");
		return;
	}

	temp = thermal_hwmon_lookup_temp(hwmon, tz);
	if (unlikely(!temp)) {
		/* Should never happen... */
		dev_dbg(&tz->device, "temperature input lookup failed!\n");
		return;
	}
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639
	device_remove_file(hwmon->device, &temp->temp_input.attr);
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640
	if (tz->ops->get_crit_temp)
641
		device_remove_file(hwmon->device, &temp->temp_crit.attr);
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	mutex_lock(&thermal_list_lock);
644 645
	list_del(&temp->hwmon_node);
	kfree(temp);
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	if (!list_empty(&hwmon->tz_list)) {
		mutex_unlock(&thermal_list_lock);
		return;
	}
	list_del(&hwmon->node);
	mutex_unlock(&thermal_list_lock);

	device_remove_file(hwmon->device, &dev_attr_name);
	hwmon_device_unregister(hwmon->device);
	kfree(hwmon);
}
#else
static int
thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
{
	return 0;
}

static void
thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
{
}
#endif

670 671 672 673 674 675 676 677 678
static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
					    int delay)
{
	cancel_delayed_work(&(tz->poll_queue));

	if (!delay)
		return;

	if (delay > 1000)
679
		queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
680 681
				      round_jiffies(msecs_to_jiffies(delay)));
	else
682
		queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
				      msecs_to_jiffies(delay));
}

static void thermal_zone_device_passive(struct thermal_zone_device *tz,
					int temp, int trip_temp, int trip)
{
	int trend = 0;
	struct thermal_cooling_device_instance *instance;
	struct thermal_cooling_device *cdev;
	long state, max_state;

	/*
	 * 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 (temp >= trip_temp) {
		tz->passive = true;

		trend = (tz->tc1 * (temp - tz->last_temperature)) +
			(tz->tc2 * (temp - trip_temp));

		/* Heating up? */
		if (trend > 0) {
			list_for_each_entry(instance, &tz->cooling_devices,
					    node) {
				if (instance->trip != trip)
					continue;
				cdev = instance->cdev;
				cdev->ops->get_cur_state(cdev, &state);
				cdev->ops->get_max_state(cdev, &max_state);
				if (state++ < max_state)
					cdev->ops->set_cur_state(cdev, state);
			}
		} else if (trend < 0) { /* Cooling off? */
			list_for_each_entry(instance, &tz->cooling_devices,
					    node) {
				if (instance->trip != trip)
					continue;
				cdev = instance->cdev;
				cdev->ops->get_cur_state(cdev, &state);
				cdev->ops->get_max_state(cdev, &max_state);
				if (state > 0)
					cdev->ops->set_cur_state(cdev, --state);
			}
		}
		return;
	}

	/*
	 * Below Trip?
	 * -----------
	 * Implement passive cooling hysteresis to slowly increase performance
	 * and avoid thrashing around the passive trip point.  Note that we
	 * assume symmetry.
	 */
	list_for_each_entry(instance, &tz->cooling_devices, node) {
		if (instance->trip != trip)
			continue;
		cdev = instance->cdev;
		cdev->ops->get_cur_state(cdev, &state);
		cdev->ops->get_max_state(cdev, &max_state);
		if (state > 0)
			cdev->ops->set_cur_state(cdev, --state);
		if (state == 0)
			tz->passive = false;
	}
}

static void thermal_zone_device_check(struct work_struct *work)
{
	struct thermal_zone_device *tz = container_of(work, struct
						      thermal_zone_device,
						      poll_queue.work);
	thermal_zone_device_update(tz);
}
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/**
 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 * @tz:		thermal zone device
 * @trip:	indicates which trip point the cooling devices is
 *		associated with in this thermal zone.
 * @cdev:	thermal cooling device
768 769
 *
 * This function is usually called in the thermal zone device .bind callback.
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 */
int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
				     int trip,
				     struct thermal_cooling_device *cdev)
{
	struct thermal_cooling_device_instance *dev;
	struct thermal_cooling_device_instance *pos;
777 778
	struct thermal_zone_device *pos1;
	struct thermal_cooling_device *pos2;
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	int result;

781
	if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
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		return -EINVAL;

784 785 786 787 788 789 790 791 792 793
	list_for_each_entry(pos1, &thermal_tz_list, node) {
		if (pos1 == tz)
			break;
	}
	list_for_each_entry(pos2, &thermal_cdev_list, node) {
		if (pos2 == cdev)
			break;
	}

	if (tz != pos1 || cdev != pos2)
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		return -EINVAL;

	dev =
	    kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;
	dev->tz = tz;
	dev->cdev = cdev;
	dev->trip = trip;
	result = get_idr(&tz->idr, &tz->lock, &dev->id);
	if (result)
		goto free_mem;

	sprintf(dev->name, "cdev%d", dev->id);
	result =
	    sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
	if (result)
		goto release_idr;

	sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
814
	sysfs_attr_init(&dev->attr.attr);
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	dev->attr.attr.name = dev->attr_name;
	dev->attr.attr.mode = 0444;
	dev->attr.show = thermal_cooling_device_trip_point_show;
	result = device_create_file(&tz->device, &dev->attr);
	if (result)
		goto remove_symbol_link;

	mutex_lock(&tz->lock);
	list_for_each_entry(pos, &tz->cooling_devices, node)
	    if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
		result = -EEXIST;
		break;
	}
	if (!result)
		list_add_tail(&dev->node, &tz->cooling_devices);
	mutex_unlock(&tz->lock);

	if (!result)
		return 0;

	device_remove_file(&tz->device, &dev->attr);
      remove_symbol_link:
	sysfs_remove_link(&tz->device.kobj, dev->name);
      release_idr:
	release_idr(&tz->idr, &tz->lock, dev->id);
      free_mem:
	kfree(dev);
	return result;
}
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EXPORT_SYMBOL(thermal_zone_bind_cooling_device);

/**
 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 * @tz:		thermal zone device
 * @trip:	indicates which trip point the cooling devices is
 *		associated with in this thermal zone.
 * @cdev:	thermal cooling device
853 854
 *
 * This function is usually called in the thermal zone device .unbind callback.
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 */
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
				       int trip,
				       struct thermal_cooling_device *cdev)
{
	struct thermal_cooling_device_instance *pos, *next;

	mutex_lock(&tz->lock);
	list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
864
		if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
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			list_del(&pos->node);
			mutex_unlock(&tz->lock);
			goto unbind;
		}
	}
	mutex_unlock(&tz->lock);

	return -ENODEV;

      unbind:
	device_remove_file(&tz->device, &pos->attr);
	sysfs_remove_link(&tz->device.kobj, pos->name);
	release_idr(&tz->idr, &tz->lock, pos->id);
	kfree(pos);
	return 0;
}
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EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);

static void thermal_release(struct device *dev)
{
	struct thermal_zone_device *tz;
	struct thermal_cooling_device *cdev;

889
	if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
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		tz = to_thermal_zone(dev);
		kfree(tz);
	} else {
		cdev = to_cooling_device(dev);
		kfree(cdev);
	}
}

static struct class thermal_class = {
	.name = "thermal",
	.dev_release = thermal_release,
};

/**
 * thermal_cooling_device_register - register a new thermal cooling device
 * @type:	the thermal cooling device type.
 * @devdata:	device private data.
 * @ops:		standard thermal cooling devices callbacks.
 */
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struct thermal_cooling_device *thermal_cooling_device_register(
     char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
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{
	struct thermal_cooling_device *cdev;
	struct thermal_zone_device *pos;
	int result;

	if (strlen(type) >= THERMAL_NAME_LENGTH)
917
		return ERR_PTR(-EINVAL);
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	if (!ops || !ops->get_max_state || !ops->get_cur_state ||
920
	    !ops->set_cur_state)
921
		return ERR_PTR(-EINVAL);
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	cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
	if (!cdev)
925
		return ERR_PTR(-ENOMEM);
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	result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
	if (result) {
		kfree(cdev);
930
		return ERR_PTR(result);
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	}

	strcpy(cdev->type, type);
	cdev->ops = ops;
	cdev->device.class = &thermal_class;
	cdev->devdata = devdata;
937
	dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
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	result = device_register(&cdev->device);
	if (result) {
		release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
		kfree(cdev);
942
		return ERR_PTR(result);
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	}

	/* sys I/F */
	if (type) {
947
		result = device_create_file(&cdev->device, &dev_attr_cdev_type);
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		if (result)
			goto unregister;
	}

	result = device_create_file(&cdev->device, &dev_attr_max_state);
	if (result)
		goto unregister;

	result = device_create_file(&cdev->device, &dev_attr_cur_state);
	if (result)
		goto unregister;

	mutex_lock(&thermal_list_lock);
	list_add(&cdev->node, &thermal_cdev_list);
	list_for_each_entry(pos, &thermal_tz_list, node) {
		if (!pos->ops->bind)
			continue;
		result = pos->ops->bind(pos, cdev);
		if (result)
			break;

	}
	mutex_unlock(&thermal_list_lock);

	if (!result)
		return cdev;

      unregister:
	release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
	device_unregister(&cdev->device);
978
	return ERR_PTR(result);
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}
980

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EXPORT_SYMBOL(thermal_cooling_device_register);

/**
 * thermal_cooling_device_unregister - removes the registered thermal cooling device
 * @cdev:	the thermal cooling device to remove.
 *
 * thermal_cooling_device_unregister() must be called when the device is no
 * longer needed.
 */
void thermal_cooling_device_unregister(struct
				       thermal_cooling_device
				       *cdev)
{
	struct thermal_zone_device *tz;
	struct thermal_cooling_device *pos = NULL;

	if (!cdev)
		return;

	mutex_lock(&thermal_list_lock);
	list_for_each_entry(pos, &thermal_cdev_list, node)
	    if (pos == cdev)
		break;
	if (pos != cdev) {
		/* thermal cooling device not found */
		mutex_unlock(&thermal_list_lock);
		return;
	}
	list_del(&cdev->node);
	list_for_each_entry(tz, &thermal_tz_list, node) {
		if (!tz->ops->unbind)
			continue;
		tz->ops->unbind(tz, cdev);
	}
	mutex_unlock(&thermal_list_lock);
	if (cdev->type[0])
1017
		device_remove_file(&cdev->device, &dev_attr_cdev_type);
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	device_remove_file(&cdev->device, &dev_attr_max_state);
	device_remove_file(&cdev->device, &dev_attr_cur_state);

	release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
	device_unregister(&cdev->device);
	return;
}
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EXPORT_SYMBOL(thermal_cooling_device_unregister);

1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
/**
 * thermal_zone_device_update - force an update of a thermal zone's state
 * @ttz:	the thermal zone to update
 */

void thermal_zone_device_update(struct thermal_zone_device *tz)
{
	int count, ret = 0;
	long temp, trip_temp;
	enum thermal_trip_type trip_type;
	struct thermal_cooling_device_instance *instance;
	struct thermal_cooling_device *cdev;

	mutex_lock(&tz->lock);

1043 1044 1045 1046 1047 1048
	if (tz->ops->get_temp(tz, &temp)) {
		/* get_temp failed - retry it later */
		printk(KERN_WARNING PREFIX "failed to read out thermal zone "
		       "%d\n", tz->id);
		goto leave;
	}
1049 1050 1051 1052 1053 1054 1055

	for (count = 0; count < tz->trips; count++) {
		tz->ops->get_trip_type(tz, count, &trip_type);
		tz->ops->get_trip_temp(tz, count, &trip_temp);

		switch (trip_type) {
		case THERMAL_TRIP_CRITICAL:
1056
			if (temp >= trip_temp) {
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
				if (tz->ops->notify)
					ret = tz->ops->notify(tz, count,
							      trip_type);
				if (!ret) {
					printk(KERN_EMERG
					       "Critical temperature reached (%ld C), shutting down.\n",
					       temp/1000);
					orderly_poweroff(true);
				}
			}
			break;
		case THERMAL_TRIP_HOT:
1069
			if (temp >= trip_temp)
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
				if (tz->ops->notify)
					tz->ops->notify(tz, count, trip_type);
			break;
		case THERMAL_TRIP_ACTIVE:
			list_for_each_entry(instance, &tz->cooling_devices,
					    node) {
				if (instance->trip != count)
					continue;

				cdev = instance->cdev;

1081
				if (temp >= trip_temp)
1082 1083 1084 1085 1086 1087
					cdev->ops->set_cur_state(cdev, 1);
				else
					cdev->ops->set_cur_state(cdev, 0);
			}
			break;
		case THERMAL_TRIP_PASSIVE:
1088
			if (temp >= trip_temp || tz->passive)
1089 1090 1091 1092 1093
				thermal_zone_device_passive(tz, temp,
							    trip_temp, count);
			break;
		}
	}
1094 1095 1096 1097 1098

	if (tz->forced_passive)
		thermal_zone_device_passive(tz, temp, tz->forced_passive,
					    THERMAL_TRIPS_NONE);

1099
	tz->last_temperature = temp;
1100 1101

      leave:
1102 1103 1104 1105
	if (tz->passive)
		thermal_zone_device_set_polling(tz, tz->passive_delay);
	else if (tz->polling_delay)
		thermal_zone_device_set_polling(tz, tz->polling_delay);
1106 1107
	else
		thermal_zone_device_set_polling(tz, 0);
1108 1109 1110 1111
	mutex_unlock(&tz->lock);
}
EXPORT_SYMBOL(thermal_zone_device_update);

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/**
 * thermal_zone_device_register - register a new thermal zone device
 * @type:	the thermal zone device type
 * @trips:	the number of trip points the thermal zone support
 * @devdata:	private device data
 * @ops:	standard thermal zone device callbacks
1118 1119 1120 1121 1122 1123 1124
 * @tc1:	thermal coefficient 1 for passive calculations
 * @tc2:	thermal coefficient 2 for passive calculations
 * @passive_delay: number of milliseconds to wait between polls when
 *		   performing passive cooling
 * @polling_delay: number of milliseconds to wait between polls when checking
 *		   whether trip points have been crossed (0 for interrupt
 *		   driven systems)
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 *
 * thermal_zone_device_unregister() must be called when the device is no
1127 1128
 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
 * section 11.1.5.1 of the ACPI specification 3.0.
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 */
struct thermal_zone_device *thermal_zone_device_register(char *type,
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	int trips, void *devdata,
	const struct thermal_zone_device_ops *ops,
	int tc1, int tc2, int passive_delay, int polling_delay)
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{
	struct thermal_zone_device *tz;
	struct thermal_cooling_device *pos;
1137
	enum thermal_trip_type trip_type;
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	int result;
	int count;
1140
	int passive = 0;
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	if (strlen(type) >= THERMAL_NAME_LENGTH)
1143
		return ERR_PTR(-EINVAL);
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	if (trips > THERMAL_MAX_TRIPS || trips < 0)
1146
		return ERR_PTR(-EINVAL);
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	if (!ops || !ops->get_temp)
1149
		return ERR_PTR(-EINVAL);
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	tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
	if (!tz)
1153
		return ERR_PTR(-ENOMEM);
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	INIT_LIST_HEAD(&tz->cooling_devices);
	idr_init(&tz->idr);
	mutex_init(&tz->lock);
	result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
	if (result) {
		kfree(tz);
1161
		return ERR_PTR(result);
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	}

	strcpy(tz->type, type);
	tz->ops = ops;
	tz->device.class = &thermal_class;
	tz->devdata = devdata;
	tz->trips = trips;
1169 1170 1171 1172 1173
	tz->tc1 = tc1;
	tz->tc2 = tc2;
	tz->passive_delay = passive_delay;
	tz->polling_delay = polling_delay;

1174
	dev_set_name(&tz->device, "thermal_zone%d", tz->id);
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	result = device_register(&tz->device);
	if (result) {
		release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
		kfree(tz);
1179
		return ERR_PTR(result);
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	}

	/* sys I/F */
	if (type) {
		result = device_create_file(&tz->device, &dev_attr_type);
		if (result)
			goto unregister;
	}

	result = device_create_file(&tz->device, &dev_attr_temp);
	if (result)
		goto unregister;

	if (ops->get_mode) {
		result = device_create_file(&tz->device, &dev_attr_mode);
		if (result)
			goto unregister;
	}

	for (count = 0; count < trips; count++) {
		TRIP_POINT_ATTR_ADD(&tz->device, count, result);
		if (result)
			goto unregister;
1203 1204 1205
		tz->ops->get_trip_type(tz, count, &trip_type);
		if (trip_type == THERMAL_TRIP_PASSIVE)
			passive = 1;
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	}

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	if (!passive)
		result = device_create_file(&tz->device,
					    &dev_attr_passive);

	if (result)
		goto unregister;

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	result = thermal_add_hwmon_sysfs(tz);
	if (result)
		goto unregister;

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	mutex_lock(&thermal_list_lock);
	list_add_tail(&tz->node, &thermal_tz_list);
	if (ops->bind)
		list_for_each_entry(pos, &thermal_cdev_list, node) {
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		result = ops->bind(tz, pos);
		if (result)
			break;
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		}
	mutex_unlock(&thermal_list_lock);

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	INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);

	thermal_zone_device_update(tz);

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	if (!result)
		return tz;

      unregister:
	release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
	device_unregister(&tz->device);
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	return ERR_PTR(result);
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}
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EXPORT_SYMBOL(thermal_zone_device_register);

/**
 * thermal_device_unregister - removes the registered thermal zone device
 * @tz: the thermal zone device to remove
 */
void thermal_zone_device_unregister(struct thermal_zone_device *tz)
{
	struct thermal_cooling_device *cdev;
	struct thermal_zone_device *pos = NULL;
	int count;

	if (!tz)
		return;

	mutex_lock(&thermal_list_lock);
	list_for_each_entry(pos, &thermal_tz_list, node)
	    if (pos == tz)
		break;
	if (pos != tz) {
		/* thermal zone device not found */
		mutex_unlock(&thermal_list_lock);
		return;
	}
	list_del(&tz->node);
	if (tz->ops->unbind)
		list_for_each_entry(cdev, &thermal_cdev_list, node)
		    tz->ops->unbind(tz, cdev);
	mutex_unlock(&thermal_list_lock);

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	thermal_zone_device_set_polling(tz, 0);

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	if (tz->type[0])
		device_remove_file(&tz->device, &dev_attr_type);
	device_remove_file(&tz->device, &dev_attr_temp);
	if (tz->ops->get_mode)
		device_remove_file(&tz->device, &dev_attr_mode);

	for (count = 0; count < tz->trips; count++)
		TRIP_POINT_ATTR_REMOVE(&tz->device, count);

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	thermal_remove_hwmon_sysfs(tz);
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	release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
	idr_destroy(&tz->idr);
	mutex_destroy(&tz->lock);
	device_unregister(&tz->device);
	return;
}
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EXPORT_SYMBOL(thermal_zone_device_unregister);

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#ifdef CONFIG_NET
static struct genl_family thermal_event_genl_family = {
	.id = GENL_ID_GENERATE,
	.name = THERMAL_GENL_FAMILY_NAME,
	.version = THERMAL_GENL_VERSION,
	.maxattr = THERMAL_GENL_ATTR_MAX,
};

static struct genl_multicast_group thermal_event_mcgrp = {
	.name = THERMAL_GENL_MCAST_GROUP_NAME,
};

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int thermal_generate_netlink_event(u32 orig, enum events event)
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{
	struct sk_buff *skb;
	struct nlattr *attr;
	struct thermal_genl_event *thermal_event;
	void *msg_header;
	int size;
	int result;
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	static unsigned int thermal_event_seqnum;
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	/* allocate memory */
	size = nla_total_size(sizeof(struct thermal_genl_event)) + \
				nla_total_size(0);

	skb = genlmsg_new(size, GFP_ATOMIC);
	if (!skb)
		return -ENOMEM;

	/* add the genetlink message header */
	msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
				 &thermal_event_genl_family, 0,
				 THERMAL_GENL_CMD_EVENT);
	if (!msg_header) {
		nlmsg_free(skb);
		return -ENOMEM;
	}

	/* fill the data */
	attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
			sizeof(struct thermal_genl_event));

	if (!attr) {
		nlmsg_free(skb);
		return -EINVAL;
	}

	thermal_event = nla_data(attr);
	if (!thermal_event) {
		nlmsg_free(skb);
		return -EINVAL;
	}

	memset(thermal_event, 0, sizeof(struct thermal_genl_event));

	thermal_event->orig = orig;
	thermal_event->event = event;

	/* send multicast genetlink message */
	result = genlmsg_end(skb, msg_header);
	if (result < 0) {
		nlmsg_free(skb);
		return result;
	}

	result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
	if (result)
		printk(KERN_INFO "failed to send netlink event:%d", result);

	return result;
}
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EXPORT_SYMBOL(thermal_generate_netlink_event);
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static int genetlink_init(void)
{
	int result;

	result = genl_register_family(&thermal_event_genl_family);
	if (result)
		return result;

	result = genl_register_mc_group(&thermal_event_genl_family,
					&thermal_event_mcgrp);
	if (result)
		genl_unregister_family(&thermal_event_genl_family);
	return result;
}

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static void genetlink_exit(void)
{
	genl_unregister_family(&thermal_event_genl_family);
}
#else /* !CONFIG_NET */
static inline int genetlink_init(void) { return 0; }
static inline void genetlink_exit(void) {}
#endif /* !CONFIG_NET */

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static int __init thermal_init(void)
{
	int result = 0;

	result = class_register(&thermal_class);
	if (result) {
		idr_destroy(&thermal_tz_idr);
		idr_destroy(&thermal_cdev_idr);
		mutex_destroy(&thermal_idr_lock);
		mutex_destroy(&thermal_list_lock);
	}
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	result = genetlink_init();
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	return result;
}

static void __exit thermal_exit(void)
{
	class_unregister(&thermal_class);
	idr_destroy(&thermal_tz_idr);
	idr_destroy(&thermal_cdev_idr);
	mutex_destroy(&thermal_idr_lock);
	mutex_destroy(&thermal_list_lock);
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	genetlink_exit();
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}

1416
fs_initcall(thermal_init);
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module_exit(thermal_exit);