thermal_sys.c 43.9 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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#include "thermal_core.h"

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MODULE_AUTHOR("Zhang Rui");
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MODULE_DESCRIPTION("Generic thermal management sysfs support");
MODULE_LICENSE("GPL");

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);
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static LIST_HEAD(thermal_governor_list);

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static DEFINE_MUTEX(thermal_list_lock);
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static DEFINE_MUTEX(thermal_governor_lock);

static struct thermal_governor *__find_governor(const char *name)
{
	struct thermal_governor *pos;

	list_for_each_entry(pos, &thermal_governor_list, governor_list)
		if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
			return pos;

	return NULL;
}

int thermal_register_governor(struct thermal_governor *governor)
{
	int err;
	const char *name;
	struct thermal_zone_device *pos;

	if (!governor)
		return -EINVAL;

	mutex_lock(&thermal_governor_lock);

	err = -EBUSY;
	if (__find_governor(governor->name) == NULL) {
		err = 0;
		list_add(&governor->governor_list, &thermal_governor_list);
	}

	mutex_lock(&thermal_list_lock);

	list_for_each_entry(pos, &thermal_tz_list, node) {
		if (pos->governor)
			continue;
		if (pos->tzp)
			name = pos->tzp->governor_name;
		else
			name = DEFAULT_THERMAL_GOVERNOR;
		if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
			pos->governor = governor;
	}

	mutex_unlock(&thermal_list_lock);
	mutex_unlock(&thermal_governor_lock);

	return err;
}
EXPORT_SYMBOL_GPL(thermal_register_governor);

void thermal_unregister_governor(struct thermal_governor *governor)
{
	struct thermal_zone_device *pos;

	if (!governor)
		return;

	mutex_lock(&thermal_governor_lock);

	if (__find_governor(governor->name) == NULL)
		goto exit;

	mutex_lock(&thermal_list_lock);

	list_for_each_entry(pos, &thermal_tz_list, node) {
		if (!strnicmp(pos->governor->name, governor->name,
						THERMAL_NAME_LENGTH))
			pos->governor = NULL;
	}

	mutex_unlock(&thermal_list_lock);
	list_del(&governor->governor_list);
exit:
	mutex_unlock(&thermal_governor_lock);
	return;
}
EXPORT_SYMBOL_GPL(thermal_unregister_governor);
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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;

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	*id = *id & MAX_IDR_MASK;
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	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);
}

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int get_tz_trend(struct thermal_zone_device *tz, int trip)
{
	enum thermal_trend trend;

	if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
		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;
	}

	return trend;
}
EXPORT_SYMBOL(get_tz_trend);

struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
			struct thermal_cooling_device *cdev, int trip)
{
	struct thermal_instance *pos = NULL;
	struct thermal_instance *target_instance = NULL;

	mutex_lock(&tz->lock);
	mutex_lock(&cdev->lock);

	list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
		if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
			target_instance = pos;
			break;
		}
	}

	mutex_unlock(&cdev->lock);
	mutex_unlock(&tz->lock);

	return target_instance;
}
EXPORT_SYMBOL(get_thermal_instance);

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/* 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 ssize_t
policy_store(struct device *dev, struct device_attribute *attr,
		    const char *buf, size_t count)
{
	int ret = -EINVAL;
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	struct thermal_governor *gov;

	mutex_lock(&thermal_governor_lock);

	gov = __find_governor(buf);
	if (!gov)
		goto exit;

	tz->governor = gov;
	ret = count;

exit:
	mutex_unlock(&thermal_governor_lock);
	return ret;
}

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

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

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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 DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_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, sizeof(temp->temp_input.name),
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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,
				 sizeof(temp->temp_crit.name),
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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)
{
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	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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	device_remove_file(hwmon->device, &temp->temp_input.attr);
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	if (tz->ops->get_crit_temp)
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		device_remove_file(hwmon->device, &temp->temp_crit.attr);
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	mutex_lock(&thermal_list_lock);
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	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

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static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
					    int delay)
{
	if (delay > 1000)
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		mod_delayed_work(system_freezable_wq, &tz->poll_queue,
				 round_jiffies(msecs_to_jiffies(delay)));
	else if (delay)
		mod_delayed_work(system_freezable_wq, &tz->poll_queue,
				 msecs_to_jiffies(delay));
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	else
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		cancel_delayed_work(&tz->poll_queue);
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}

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
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 *
 * 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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{
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	struct thermal_instance *dev;
	struct thermal_instance *pos;
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	struct thermal_zone_device *pos1;
	struct thermal_cooling_device *pos2;
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	unsigned long max_state;
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	int result;

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

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	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 =
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	    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;
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	dev->target = THERMAL_NO_TARGET;
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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);
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	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);
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	mutex_lock(&cdev->lock);
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	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;
	}
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	if (!result) {
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		list_add_tail(&dev->tz_node, &tz->thermal_instances);
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		list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
	}
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	mutex_unlock(&cdev->lock);
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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
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 *
 * 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)
{
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	struct thermal_instance *pos, *next;
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	mutex_lock(&tz->lock);
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	mutex_lock(&cdev->lock);
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	list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
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		if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
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			list_del(&pos->tz_node);
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			list_del(&pos->cdev_node);
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			mutex_unlock(&cdev->lock);
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			mutex_unlock(&tz->lock);
			goto unbind;
		}
	}
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	mutex_unlock(&cdev->lock);
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	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;

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

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	strcpy(cdev->type, type ? : "");
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	mutex_init(&cdev->lock);
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	INIT_LIST_HEAD(&cdev->thermal_instances);
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	cdev->ops = ops;
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	cdev->updated = true;
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	cdev->device.class = &thermal_class;
	cdev->devdata = devdata;
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	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);
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		return ERR_PTR(result);
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	}

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

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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;

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	mutex_lock(&cdev->lock);
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	/* 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;
	}
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	mutex_unlock(&cdev->lock);
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	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);
}

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/*
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 * Cooling algorithm for both active and passive cooling
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 *
 * 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)
{
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	struct thermal_instance *instance;
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	struct thermal_cooling_device *cdev = NULL;
	unsigned long cur_state, max_state;
	long trip_temp;
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	enum thermal_trip_type trip_type;
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	enum thermal_trend trend;

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	if (trip == THERMAL_TRIPS_NONE) {
		trip_temp = tz->forced_passive;
		trip_type = THERMAL_TRIPS_NONE;
	} else {
		tz->ops->get_trip_temp(tz, trip, &trip_temp);
		tz->ops->get_trip_type(tz, trip, &trip_type);
	}
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	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) {
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		list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
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			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;
			}
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			/* activate a passive thermal instance */
			if ((trip_type == THERMAL_TRIP_PASSIVE ||
			     trip_type == THERMAL_TRIPS_NONE) &&
			     instance->target == THERMAL_NO_TARGET)
				tz->passive++;

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			instance->target = cur_state;
			cdev->updated = false; /* cooling device needs update */
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		}
	} else {	/* below trip */
1250
		list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
1251 1252 1253
			if (instance->trip != trip)
				continue;

1254 1255 1256
			/* Do not use the inactive thermal instance */
			if (instance->target == THERMAL_NO_TARGET)
				continue;
1257 1258 1259 1260
			cdev = instance->cdev;
			cdev->ops->get_cur_state(cdev, &cur_state);

			cur_state = cur_state > instance->lower ?
1261
				    (cur_state - 1) : THERMAL_NO_TARGET;
1262 1263 1264 1265 1266 1267

			/* deactivate a passive thermal instance */
			if ((trip_type == THERMAL_TRIP_PASSIVE ||
			     trip_type == THERMAL_TRIPS_NONE) &&
			     cur_state == THERMAL_NO_TARGET)
				tz->passive--;
1268 1269
			instance->target = cur_state;
			cdev->updated = false; /* cooling device needs update */
1270 1271 1272 1273 1274
		}
	}

	return;
}
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
/**
 * 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);

1288 1289
	if (tz->ops->get_temp(tz, &temp)) {
		/* get_temp failed - retry it later */
1290
		pr_warn("failed to read out thermal zone %d\n", tz->id);
1291 1292
		goto leave;
	}
1293

1294 1295 1296
	tz->last_temperature = tz->temperature;
	tz->temperature = temp;

1297 1298 1299 1300 1301 1302
	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:
1303
			if (temp >= trip_temp) {
1304 1305 1306 1307
				if (tz->ops->notify)
					ret = tz->ops->notify(tz, count,
							      trip_type);
				if (!ret) {
1308 1309
					pr_emerg("Critical temperature reached (%ld C), shutting down\n",
						 temp/1000);
1310 1311 1312 1313 1314
					orderly_poweroff(true);
				}
			}
			break;
		case THERMAL_TRIP_HOT:
1315
			if (temp >= trip_temp)
1316 1317 1318 1319
				if (tz->ops->notify)
					tz->ops->notify(tz, count, trip_type);
			break;
		case THERMAL_TRIP_ACTIVE:
1320
			thermal_zone_trip_update(tz, count, temp);
1321 1322
			break;
		case THERMAL_TRIP_PASSIVE:
1323
			if (temp >= trip_temp || tz->passive)
1324
				thermal_zone_trip_update(tz, count, temp);
1325 1326 1327
			break;
		}
	}
1328 1329

	if (tz->forced_passive)
1330 1331
		thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
	thermal_zone_do_update(tz);
1332

1333
leave:
1334 1335 1336 1337
	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);
1338 1339
	else
		thermal_zone_device_set_polling(tz, 0);
1340 1341 1342 1343
	mutex_unlock(&tz->lock);
}
EXPORT_SYMBOL(thermal_zone_device_update);

1344 1345 1346 1347 1348 1349 1350 1351
/**
 * 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;
1352
	int size = sizeof(struct thermal_attr) * tz->trips;
1353