thermal_sys.c 42.1 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#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");

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#define THERMAL_NO_TARGET -1UL
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/*
 * This structure is used to describe the behavior of
 * a certain cooling device on a certain trip point
 * in a certain thermal zone
 */
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struct thermal_instance {
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	int id;
	char name[THERMAL_NAME_LENGTH];
	struct thermal_zone_device *tz;
	struct thermal_cooling_device *cdev;
	int trip;
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	unsigned long upper;	/* Highest cooling state for this trip point */
	unsigned long lower;	/* Lowest cooling state for this trip point */
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	unsigned long target;	/* expected cooling state */
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	char attr_name[THERMAL_NAME_LENGTH];
	struct device_attribute attr;
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	struct list_head tz_node; /* node in tz->thermal_instances */
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	struct list_head cdev_node; /* node in cdev->thermal_instances */
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};

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;

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again:
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	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") - 1))
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		result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
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	else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
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		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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}

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static ssize_t
trip_point_temp_store(struct device *dev, struct device_attribute *attr,
		     const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip, ret;
	unsigned long temperature;

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

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

	if (kstrtoul(buf, 10, &temperature))
		return -EINVAL;

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

	return ret ? ret : count;
}

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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
trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip, ret;
	unsigned long temperature;

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

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

	if (kstrtoul(buf, 10, &temperature))
		return -EINVAL;

	/*
	 * We are not doing any check on the 'temperature' value
	 * here. The driver implementing 'set_trip_hyst' has to
	 * take care of this.
	 */
	ret = tz->ops->set_trip_hyst(tz, trip, temperature);

	return ret ? ret : count;
}

static ssize_t
trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip, ret;
	unsigned long temperature;

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

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

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

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

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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,
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						THERMAL_TRIPS_NONE, cdev,
						THERMAL_NO_LIMIT,
						THERMAL_NO_LIMIT);
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		}
		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->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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/* 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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{
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	struct thermal_instance *instance;
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	instance =
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	    container_of(attr, struct thermal_instance, attr);
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	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)
{
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669
	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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671
	device_remove_file(hwmon->device, &temp->temp_input.attr);
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	if (tz->ops->get_crit_temp)
673
		device_remove_file(hwmon->device, &temp->temp_crit.attr);
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	mutex_lock(&thermal_list_lock);
676 677
	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

702 703 704 705 706 707 708 709 710
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)
711
		queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
712 713
				      round_jiffies(msecs_to_jiffies(delay)));
	else
714
		queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
715 716 717 718 719 720
				      msecs_to_jiffies(delay));
}

static void thermal_zone_device_passive(struct thermal_zone_device *tz,
					int temp, int trip_temp, int trip)
{
721
	enum thermal_trend trend;
722
	struct thermal_instance *instance;
723 724 725
	struct thermal_cooling_device *cdev;
	long state, max_state;

726
	if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
727 728 729 730 731 732 733 734 735 736 737 738
		/*
		 * compare the current temperature and previous temperature
		 * to get the thermal trend, if no special requirement
		 */
		if (tz->temperature > tz->last_temperature)
			trend = THERMAL_TREND_RAISING;
		else if (tz->temperature < tz->last_temperature)
			trend = THERMAL_TREND_DROPPING;
		else
			trend = THERMAL_TREND_STABLE;
	}

739 740 741 742 743 744 745 746 747 748 749
	/*
	 * 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;

		/* Heating up? */
750
		if (trend == THERMAL_TREND_RAISING) {
751
			list_for_each_entry(instance, &tz->thermal_instances,
752
					    tz_node) {
753 754 755 756 757 758 759 760
				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);
			}
761
		} else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */
762
			list_for_each_entry(instance, &tz->thermal_instances,
763
					    tz_node) {
764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
				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.
	 */
783
	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
		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
810 811
 *
 * 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,
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				     struct thermal_cooling_device *cdev,
				     unsigned long upper, unsigned long lower)
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{
818 819
	struct thermal_instance *dev;
	struct thermal_instance *pos;
820 821
	struct thermal_zone_device *pos1;
	struct thermal_cooling_device *pos2;
822
	unsigned long max_state;
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	int result;

825
	if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
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		return -EINVAL;

828 829 830 831 832 833 834 835 836 837
	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;

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	cdev->ops->get_max_state(cdev, &max_state);

	/* lower default 0, upper default max_state */
	lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
	upper = upper == THERMAL_NO_LIMIT ? max_state : upper;

	if (lower > upper || upper > max_state)
		return -EINVAL;

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	dev =
850
	    kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
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	if (!dev)
		return -ENOMEM;
	dev->tz = tz;
	dev->cdev = cdev;
	dev->trip = trip;
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	dev->upper = upper;
	dev->lower = lower;
858
	dev->target = THERMAL_NO_TARGET;
859

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	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);
871
	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);
880
	list_for_each_entry(pos, &tz->thermal_instances, tz_node)
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	    if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
		result = -EEXIST;
		break;
	}
885
	if (!result) {
886
		list_add_tail(&dev->tz_node, &tz->thermal_instances);
887 888
		list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
	}
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	mutex_unlock(&tz->lock);

	if (!result)
		return 0;

	device_remove_file(&tz->device, &dev->attr);
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remove_symbol_link:
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	sysfs_remove_link(&tz->device.kobj, dev->name);
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release_idr:
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	release_idr(&tz->idr, &tz->lock, dev->id);
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free_mem:
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	kfree(dev);
	return result;
}
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
911 912
 *
 * 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)
{
918
	struct thermal_instance *pos, *next;
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	mutex_lock(&tz->lock);
921
	list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
922
		if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
923
			list_del(&pos->tz_node);
924
			list_del(&pos->cdev_node);
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			mutex_unlock(&tz->lock);
			goto unbind;
		}
	}
	mutex_unlock(&tz->lock);

	return -ENODEV;

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unbind:
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	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;
}
EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);

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

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	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)
977
		return ERR_PTR(-EINVAL);
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	if (!ops || !ops->get_max_state || !ops->get_cur_state ||
980
	    !ops->set_cur_state)
981
		return ERR_PTR(-EINVAL);
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	cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
	if (!cdev)
985
		return ERR_PTR(-ENOMEM);
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	result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
	if (result) {
		kfree(cdev);
990
		return ERR_PTR(result);
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	}

	strcpy(cdev->type, type);
994
	INIT_LIST_HEAD(&cdev->thermal_instances);
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	cdev->ops = ops;
996
	cdev->updated = true;
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	cdev->device.class = &thermal_class;
	cdev->devdata = devdata;
999
	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);
1004
		return ERR_PTR(result);
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	}

	/* sys I/F */
	if (type) {
1009
		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;

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unregister:
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	release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
	device_unregister(&cdev->device);
1040
	return ERR_PTR(result);
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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])
1078
		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;
}
EXPORT_SYMBOL(thermal_cooling_device_unregister);

1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
static void thermal_cdev_do_update(struct thermal_cooling_device *cdev)
{
	struct thermal_instance *instance;
	unsigned long target = 0;

	/* cooling device is updated*/
	if (cdev->updated)
		return;

	/* Make sure cdev enters the deepest cooling state */
	list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
		if (instance->target == THERMAL_NO_TARGET)
			continue;
		if (instance->target > target)
			target = instance->target;
	}
	cdev->ops->set_cur_state(cdev, target);
	cdev->updated = true;
}

static void thermal_zone_do_update(struct thermal_zone_device *tz)
{
	struct thermal_instance *instance;

	list_for_each_entry(instance, &tz->thermal_instances, tz_node)
		thermal_cdev_do_update(instance->cdev);
}

1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
/*
 * Cooling algorithm for active trip points
 *
 * 1. if the temperature is higher than a trip point,
 *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
 *       state for this trip point
 *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
 *       state for this trip point
 *
 * 2. if the temperature is lower than a trip point, use lower
 *    cooling state for this trip point
 *
 * Note that this behaves the same as the previous passive cooling
 * algorithm.
 */

static void thermal_zone_trip_update(struct thermal_zone_device *tz,
				     int trip, long temp)
{
1135
	struct thermal_instance *instance;
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
	struct thermal_cooling_device *cdev = NULL;
	unsigned long cur_state, max_state;
	long trip_temp;
	enum thermal_trend trend;

	tz->ops->get_trip_temp(tz, trip, &trip_temp);

	if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
		/*
		 * compare the current temperature and previous temperature
		 * to get the thermal trend, if no special requirement
		 */
		if (tz->temperature > tz->last_temperature)
			trend = THERMAL_TREND_RAISING;
		else if (tz->temperature < tz->last_temperature)
			trend = THERMAL_TREND_DROPPING;
		else
			trend = THERMAL_TREND_STABLE;
	}

	if (temp >= trip_temp) {
1157
		list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
			if (instance->trip != trip)
				continue;

			cdev = instance->cdev;

			cdev->ops->get_cur_state(cdev, &cur_state);
			cdev->ops->get_max_state(cdev, &max_state);

			if (trend == THERMAL_TREND_RAISING) {
				cur_state = cur_state < instance->upper ?
					    (cur_state + 1) : instance->upper;
			} else if (trend == THERMAL_TREND_DROPPING) {
				cur_state = cur_state > instance->lower ?
				    (cur_state - 1) : instance->lower;
			}
1173 1174
			instance->target = cur_state;
			cdev->updated = false; /* cooling device needs update */
1175 1176
		}
	} else {	/* below trip */
1177
		list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1178 1179 1180
			if (instance->trip != trip)
				continue;

1181 1182 1183
			/* Do not use the inactive thermal instance */
			if (instance->target == THERMAL_NO_TARGET)
				continue;
1184 1185 1186 1187
			cdev = instance->cdev;
			cdev->ops->get_cur_state(cdev, &cur_state);

			cur_state = cur_state > instance->lower ?
1188 1189 1190
				    (cur_state - 1) : THERMAL_NO_TARGET;
			instance->target = cur_state;
			cdev->updated = false; /* cooling device needs update */
1191 1192 1193 1194 1195
		}
	}

	return;
}
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
/**
 * 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;

	mutex_lock(&tz->lock);

1209 1210
	if (tz->ops->get_temp(tz, &temp)) {
		/* get_temp failed - retry it later */
1211
		pr_warn("failed to read out thermal zone %d\n", tz->id);
1212 1213
		goto leave;
	}
1214

1215 1216 1217
	tz->last_temperature = tz->temperature;
	tz->temperature = temp;

1218 1219 1220 1221 1222 1223
	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:
1224
			if (temp >= trip_temp) {
1225 1226 1227 1228
				if (tz->ops->notify)
					ret = tz->ops->notify(tz, count,
							      trip_type);
				if (!ret) {
1229 1230
					pr_emerg("Critical temperature reached (%ld C), shutting down\n",
						 temp/1000);
1231 1232 1233 1234 1235
					orderly_poweroff(true);
				}
			}
			break;
		case THERMAL_TRIP_HOT:
1236
			if (temp >= trip_temp)
1237 1238 1239 1240
				if (tz->ops->notify)
					tz->ops->notify(tz, count, trip_type);
			break;
		case THERMAL_TRIP_ACTIVE:
1241
			thermal_zone_trip_update(tz, count, temp);
1242 1243
			break;
		case THERMAL_TRIP_PASSIVE:
1244
			if (temp >= trip_temp || tz->passive)
1245 1246 1247 1248 1249
				thermal_zone_device_passive(tz, temp,
							    trip_temp, count);
			break;
		}
	}
1250

1251
	thermal_zone_do_update(tz);
1252 1253 1254 1255
	if (tz->forced_passive)
		thermal_zone_device_passive(tz, temp, tz->forced_passive,
					    THERMAL_TRIPS_NONE);

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leave:
1257 1258 1259 1260
	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);
1261 1262
	else
		thermal_zone_device_set_polling(tz, 0);
1263 1264 1265 1266
	mutex_unlock(&tz->lock);
}
EXPORT_SYMBOL(thermal_zone_device_update);

1267 1268 1269 1270 1271 1272 1273 1274
/**
 * create_trip_attrs - create attributes for trip points
 * @tz:		the thermal zone device
 * @mask:	Writeable trip point bitmap.
 */
static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
{
	int indx;
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	int size = sizeof(struct thermal_attr) * tz->trips;
1276

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1277
	tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1278 1279 1280
	if (!tz->trip_type_attrs)
		return -ENOMEM;

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	tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1282 1283 1284 1285 1286
	if (!tz->trip_temp_attrs) {
		kfree(tz->trip_type_attrs);
		return -ENOMEM;
	}

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	if (tz->ops->get_trip_hyst) {
		tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
		if (!tz->trip_hyst_attrs) {
			kfree(tz->trip_type_attrs);
			kfree(tz->trip_temp_attrs);
			return -ENOMEM;
		}
	}
1295

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1296 1297

	for (indx = 0; indx < tz->trips; indx++) {
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327
		/* create trip type attribute */
		snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_type", indx);

		sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
		tz->trip_type_attrs[indx].attr.attr.name =
						tz->trip_type_attrs[indx].name;
		tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_type_attrs[indx].attr.show = trip_point_type_show;

		device_create_file(&tz->device,
				   &tz->trip_type_attrs[indx].attr);

		/* create trip temp attribute */
		snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_temp", indx);

		sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
		tz->trip_temp_attrs[indx].attr.attr.name =
						tz->trip_temp_attrs[indx].name;
		tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
		if (mask & (1 << indx)) {
			tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
			tz->trip_temp_attrs[indx].attr.store =
							trip_point_temp_store;
		}

		device_create_file(&tz->device,
				   &tz->trip_temp_attrs[indx].attr);
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		/* create Optional trip hyst attribute */
		if (!tz->ops->get_trip_hyst)
			continue;
		snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_hyst", indx);

		sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
		tz->trip_hyst_attrs[indx].attr.attr.name =
					tz->trip_hyst_attrs[indx].name;
		tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
		if (tz->ops->set_trip_hyst) {
			tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
			tz->trip_hyst_attrs[indx].attr.store =
					trip_point_hyst_store;
		}

		device_create_file(&tz->device,
				   &tz->trip_hyst_attrs[indx].attr);
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
	}
	return 0;
}

static void remove_trip_attrs(struct thermal_zone_device *tz)
{
	int indx;

	for (indx = 0; indx < tz->trips; indx++) {
		device_remove_file(&tz->device,
				   &tz->trip_type_attrs[indx].attr);
		device_remove_file(&tz->device,
				   &tz->trip_temp_attrs[indx].attr);
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		if (tz->ops->get_trip_hyst)
			device_remove_file(&tz->device,
				  &tz->trip_hyst_attrs[indx].attr);
1364 1365 1366
	}
	kfree(tz->trip_type_attrs);
	kfree(tz->trip_temp_attrs);
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	kfree(tz->trip_hyst_attrs);
1368 1369
}

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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
1374
 * @mask:	a bit string indicating the writeablility of trip points
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 * @devdata:	private device data
 * @ops:	standard thermal zone device callbacks
1377 1378 1379 1380 1381
 * @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
1384
 * longer needed. The passive cooling depends on the .get_trend() return value.
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 */
1386
struct thermal_zone_device *thermal_zone_device_register(const char *type,
1387
	int trips, int mask, void *devdata,
A
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1388
	const struct thermal_zone_device_ops *ops,
1389
	int passive_delay, int polling_delay)
Z
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1390 1391 1392
{
	struct thermal_zone_device *tz;
	struct thermal_cooling_device *pos;
1393
	enum thermal_trip_type trip_type;
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1394 1395
	int result;
	int count;
1396
	int passive = 0;
Z
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	if (strlen(type) >= THERMAL_NAME_LENGTH)
1399
		return ERR_PTR(-EINVAL);
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1400

1401
	if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1402
		return ERR_PTR(-EINVAL);
Z
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1403 1404

	if (!ops || !ops->get_temp)
1405
		return ERR_PTR(-EINVAL);
Z
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1406 1407 1408

	tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
	if (!tz)
1409
		return ERR_PTR(-ENOMEM);
Z
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1410

1411
	INIT_LIST_HEAD(&tz->thermal_instances);
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	idr_init(&tz->idr);
	mutex_init(&tz->lock);
	result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
	if (result) {
		kfree(tz);
1417
		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;
1425 1426 1427
	tz->passive_delay = passive_delay;
	tz->polling_delay = polling_delay;

1428
	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);
1433
		return ERR_PTR(result);
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1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
	}

	/* 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;
	}

1453 1454 1455 1456
	result = create_trip_attrs(tz, mask);
	if (result)
		goto unregister;

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	for (count = 0; count < trips; count++) {
1458 1459 1460
		tz->ops->get_trip_type(tz, count, &trip_type);
		if (trip_type == THERMAL_TRIP_PASSIVE)
			passive = 1;
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1461 1462
	}

1463 1464 1465 1466 1467 1468 1469
	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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1474 1475 1476 1477
	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) {
1478 1479 1480
		result = ops->bind(tz, pos);
		if (result)
			break;
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1481 1482 1483
		}
	mutex_unlock(&thermal_list_lock);

1484 1485 1486 1487
	INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);

	thermal_zone_device_update(tz);

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1488 1489 1490
	if (!result)
		return tz;

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Joe Perches 已提交
1491
unregister:
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1492 1493
	release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
	device_unregister(&tz->device);
1494
	return ERR_PTR(result);
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1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
}
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;

	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);

1525 1526
	thermal_zone_device_set_polling(tz, 0);

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1527 1528 1529 1530 1531
	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);
1532
	remove_trip_attrs(tz);
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Zhang Rui 已提交
1533

Z
Zhang Rui 已提交
1534
	thermal_remove_hwmon_sysfs(tz);
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1535 1536 1537 1538 1539 1540 1541 1542
	release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
	idr_destroy(&tz->idr);
	mutex_destroy(&tz->lock);
	device_unregister(&tz->device);
	return;
}
EXPORT_SYMBOL(thermal_zone_device_unregister);

1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554
#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,
};

1555
int thermal_generate_netlink_event(u32 orig, enum events event)
1556 1557 1558 1559 1560 1561 1562
{
	struct sk_buff *skb;
	struct nlattr *attr;
	struct thermal_genl_event *thermal_event;
	void *msg_header;
	int size;
	int result;
1563
	static unsigned int thermal_event_seqnum;
1564 1565

	/* allocate memory */
1566 1567
	size = nla_total_size(sizeof(struct thermal_genl_event)) +
	       nla_total_size(0);
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582

	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 */
1583 1584
	attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
			   sizeof(struct thermal_genl_event));
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610

	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)
1611
		pr_info("failed to send netlink event:%d\n", result);
1612 1613 1614

	return result;
}
1615
EXPORT_SYMBOL(thermal_generate_netlink_event);
1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631

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;
}

1632 1633 1634 1635 1636 1637 1638 1639 1640
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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Zhang Rui 已提交
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
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);
	}
1652
	result = genetlink_init();
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1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
	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);
1663
	genetlink_exit();
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Zhang Rui 已提交
1664 1665
}

1666
fs_initcall(thermal_init);
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Zhang Rui 已提交
1667
module_exit(thermal_exit);