// SPDX-License-Identifier: GPL-2.0

  /*
   *  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>

   */

  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/module.h>
  #include <linux/device.h>
  #include <linux/err.h>

  #include <linux/slab.h>

  #include <linux/kdev_t.h>
  #include <linux/idr.h>
  #include <linux/thermal.h>

  #include <linux/reboot.h>

  #include <linux/string.h>

  #include <linux/of.h>

  #include <net/netlink.h>
  #include <net/genetlink.h>

  #include <linux/suspend.h>

  #define CREATE_TRACE_POINTS
  #include <trace/events/thermal.h>

  #include "thermal_core.h"

  #include "thermal_hwmon.h"

  MODULE_AUTHOR("Zhang Rui");

  MODULE_DESCRIPTION("Generic thermal management sysfs support");

  MODULE_LICENSE("GPL v2");

  static DEFINE_IDA(thermal_tz_ida);
  static DEFINE_IDA(thermal_cdev_ida);

  
  static LIST_HEAD(thermal_tz_list);
  static LIST_HEAD(thermal_cdev_list);

  static LIST_HEAD(thermal_governor_list);

  static DEFINE_MUTEX(thermal_list_lock);

  static DEFINE_MUTEX(thermal_governor_lock);

  static DEFINE_MUTEX(poweroff_lock);

  static atomic_t in_suspend;

  static bool power_off_triggered;

  static struct thermal_governor *def_governor;

  /*
   * Governor section: set of functions to handle thermal governors
   *
   * Functions to help in the life cycle of thermal governors within
   * the thermal core and by the thermal governor code.
   */

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

  	if (!name || !name[0])
  		return def_governor;

  	list_for_each_entry(pos, &thermal_governor_list, governor_list)

  		if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))

  			return pos;
  
  	return NULL;
  }

  /**
   * bind_previous_governor() - bind the previous governor of the thermal zone
   * @tz:		a valid pointer to a struct thermal_zone_device
   * @failed_gov_name:	the name of the governor that failed to register
   *
   * Register the previous governor of the thermal zone after a new
   * governor has failed to be bound.
   */
  static void bind_previous_governor(struct thermal_zone_device *tz,
  				   const char *failed_gov_name)
  {
  	if (tz->governor && tz->governor->bind_to_tz) {
  		if (tz->governor->bind_to_tz(tz)) {
  			dev_err(&tz->device,
  				"governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor
  ",
  				failed_gov_name, tz->governor->name, tz->type);
  			tz->governor = NULL;
  		}
  	}
  }
  
  /**
   * thermal_set_governor() - Switch to another governor
   * @tz:		a valid pointer to a struct thermal_zone_device
   * @new_gov:	pointer to the new governor
   *
   * Change the governor of thermal zone @tz.
   *
   * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
   */
  static int thermal_set_governor(struct thermal_zone_device *tz,
  				struct thermal_governor *new_gov)
  {
  	int ret = 0;
  
  	if (tz->governor && tz->governor->unbind_from_tz)
  		tz->governor->unbind_from_tz(tz);
  
  	if (new_gov && new_gov->bind_to_tz) {
  		ret = new_gov->bind_to_tz(tz);
  		if (ret) {
  			bind_previous_governor(tz, new_gov->name);
  
  			return ret;
  		}
  	}
  
  	tz->governor = new_gov;
  
  	return ret;
  }

  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)) {

  		bool match_default;

  		err = 0;
  		list_add(&governor->governor_list, &thermal_governor_list);

  		match_default = !strncmp(governor->name,
  					 DEFAULT_THERMAL_GOVERNOR,
  					 THERMAL_NAME_LENGTH);
  
  		if (!def_governor && match_default)

  			def_governor = governor;

  	}
  
  	mutex_lock(&thermal_list_lock);
  
  	list_for_each_entry(pos, &thermal_tz_list, node) {

  		/*
  		 * only thermal zones with specified tz->tzp->governor_name
  		 * may run with tz->govenor unset
  		 */

  		if (pos->governor)
  			continue;

  
  		name = pos->tzp->governor_name;

  		if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
  			int ret;
  
  			ret = thermal_set_governor(pos, governor);
  			if (ret)
  				dev_err(&pos->device,
  					"Failed to set governor %s for thermal zone %s: %d
  ",
  					governor->name, pos->type, ret);
  		}

  	}
  
  	mutex_unlock(&thermal_list_lock);
  	mutex_unlock(&thermal_governor_lock);
  
  	return err;
  }

  
  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))

  		goto exit;
  
  	mutex_lock(&thermal_list_lock);
  
  	list_for_each_entry(pos, &thermal_tz_list, node) {

  		if (!strncasecmp(pos->governor->name, governor->name,

  				 THERMAL_NAME_LENGTH))

  			thermal_set_governor(pos, NULL);

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

  }

  int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
  				   char *policy)

  {

  	struct thermal_governor *gov;
  	int ret = -EINVAL;

  	mutex_lock(&thermal_governor_lock);

  	mutex_lock(&tz->lock);

  	gov = __find_governor(strim(policy));
  	if (!gov)
  		goto exit;

  	ret = thermal_set_governor(tz, gov);

  exit:
  	mutex_unlock(&tz->lock);
  	mutex_unlock(&thermal_governor_lock);

  	return ret;

  }

  int thermal_build_list_of_policies(char *buf)

  {

  	struct thermal_governor *pos;
  	ssize_t count = 0;
  	ssize_t size = PAGE_SIZE;

  	mutex_lock(&thermal_governor_lock);

  	list_for_each_entry(pos, &thermal_governor_list, governor_list) {
  		size = PAGE_SIZE - count;
  		count += scnprintf(buf + count, size, "%s ", pos->name);

  	}

  	count += scnprintf(buf + count, size, "
  ");

  	mutex_unlock(&thermal_governor_lock);

  	return count;

  }

  static void __init thermal_unregister_governors(void)

  {

  	struct thermal_governor **governor;
  
  	for_each_governor_table(governor)
  		thermal_unregister_governor(*governor);
  }

  static int __init thermal_register_governors(void)
  {
  	int ret = 0;
  	struct thermal_governor **governor;

  	for_each_governor_table(governor) {
  		ret = thermal_register_governor(*governor);
  		if (ret) {
  			pr_err("Failed to register governor: '%s'",
  			       (*governor)->name);
  			break;
  		}

  		pr_info("Registered thermal governor '%s'",
  			(*governor)->name);
  	}

  	if (ret) {
  		struct thermal_governor **gov;

  		for_each_governor_table(gov) {
  			if (gov == governor)
  				break;
  			thermal_unregister_governor(*gov);
  		}
  	}

  	return ret;

  }

  /*
   * Zone update section: main control loop applied to each zone while monitoring
   *
   * in polling mode. The monitoring is done using a workqueue.
   * Same update may be done on a zone by calling thermal_zone_device_update().
   *
   * An update means:
   * - Non-critical trips will invoke the governor responsible for that zone;
   * - Hot trips will produce a notification to userspace;
   * - Critical trip point will cause a system shutdown.
   */

  static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
  					    int delay)
  {
  	if (delay > 1000)

  		mod_delayed_work(system_freezable_power_efficient_wq,
  				 &tz->poll_queue,

  				 round_jiffies(msecs_to_jiffies(delay)));
  	else if (delay)

  		mod_delayed_work(system_freezable_power_efficient_wq,
  				 &tz->poll_queue,

  				 msecs_to_jiffies(delay));
  	else

  		cancel_delayed_work(&tz->poll_queue);

  }
  
  static void monitor_thermal_zone(struct thermal_zone_device *tz)
  {
  	mutex_lock(&tz->lock);
  
  	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);
  	else
  		thermal_zone_device_set_polling(tz, 0);
  
  	mutex_unlock(&tz->lock);
  }

  static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip)

  {

  	tz->governor ? tz->governor->throttle(tz, trip) :
  		       def_governor->throttle(tz, trip);

  }

  /**
   * thermal_emergency_poweroff_func - emergency poweroff work after a known delay
   * @work: work_struct associated with the emergency poweroff function
   *
   * This function is called in very critical situations to force
   * a kernel poweroff after a configurable timeout value.
   */
  static void thermal_emergency_poweroff_func(struct work_struct *work)
  {
  	/*
  	 * We have reached here after the emergency thermal shutdown
  	 * Waiting period has expired. This means orderly_poweroff has
  	 * not been able to shut off the system for some reason.
  	 * Try to shut down the system immediately using kernel_power_off
  	 * if populated
  	 */
  	WARN(1, "Attempting kernel_power_off: Temperature too high
  ");
  	kernel_power_off();
  
  	/*
  	 * Worst of the worst case trigger emergency restart
  	 */
  	WARN(1, "Attempting emergency_restart: Temperature too high
  ");
  	emergency_restart();
  }
  
  static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work,
  			    thermal_emergency_poweroff_func);
  
  /**
   * thermal_emergency_poweroff - Trigger an emergency system poweroff
   *
   * This may be called from any critical situation to trigger a system shutdown
   * after a known period of time. By default this is not scheduled.
   */

  static void thermal_emergency_poweroff(void)

  {
  	int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS;
  	/*
  	 * poweroff_delay_ms must be a carefully profiled positive value.
  	 * Its a must for thermal_emergency_poweroff_work to be scheduled
  	 */
  	if (poweroff_delay_ms <= 0)
  		return;
  	schedule_delayed_work(&thermal_emergency_poweroff_work,
  			      msecs_to_jiffies(poweroff_delay_ms));
  }

  static void handle_critical_trips(struct thermal_zone_device *tz,

  				  int trip, enum thermal_trip_type trip_type)

  {

  	int trip_temp;

  
  	tz->ops->get_trip_temp(tz, trip, &trip_temp);
  
  	/* If we have not crossed the trip_temp, we do not care. */

  	if (trip_temp <= 0 || tz->temperature < trip_temp)

  		return;

  	trace_thermal_zone_trip(tz, trip, trip_type);

  	if (tz->ops->notify)
  		tz->ops->notify(tz, trip, trip_type);
  
  	if (trip_type == THERMAL_TRIP_CRITICAL) {

  		dev_emerg(&tz->device,

  			  "critical temperature reached (%d C), shutting down
  ",

  			  tz->temperature / 1000);

  		mutex_lock(&poweroff_lock);
  		if (!power_off_triggered) {

  			/*
  			 * Queue a backup emergency shutdown in the event of
  			 * orderly_poweroff failure
  			 */
  			thermal_emergency_poweroff();

  			orderly_poweroff(true);
  			power_off_triggered = true;
  		}
  		mutex_unlock(&poweroff_lock);

  	}
  }
  
  static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
  {
  	enum thermal_trip_type type;

  	/* Ignore disabled trip points */
  	if (test_bit(trip, &tz->trips_disabled))
  		return;

  	tz->ops->get_trip_type(tz, trip, &type);
  
  	if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
  		handle_critical_trips(tz, trip, type);
  	else

  		handle_non_critical_trips(tz, trip);

  	/*
  	 * Alright, we handled this trip successfully.
  	 * So, start monitoring again.
  	 */
  	monitor_thermal_zone(tz);
  }
  
  static void update_temperature(struct thermal_zone_device *tz)
  {

  	int temp, ret;

  	ret = thermal_zone_get_temp(tz, &temp);

  	if (ret) {

  		if (ret != -EAGAIN)
  			dev_warn(&tz->device,
  				 "failed to read out thermal zone (%d)
  ",
  				 ret);

  		return;

  	}

  	mutex_lock(&tz->lock);

  	tz->last_temperature = tz->temperature;
  	tz->temperature = temp;

  	mutex_unlock(&tz->lock);

  	trace_thermal_temperature(tz);

  	if (tz->last_temperature == THERMAL_TEMP_INVALID)
  		dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d
  ",
  			tz->temperature);
  	else
  		dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d
  ",
  			tz->last_temperature, tz->temperature);
  }

  static void thermal_zone_device_init(struct thermal_zone_device *tz)

  {
  	struct thermal_instance *pos;

  	tz->temperature = THERMAL_TEMP_INVALID;

  	list_for_each_entry(pos, &tz->thermal_instances, tz_node)
  		pos->initialized = false;

  }

  static void thermal_zone_device_reset(struct thermal_zone_device *tz)
  {
  	tz->passive = 0;
  	thermal_zone_device_init(tz);
  }

  void thermal_zone_device_update(struct thermal_zone_device *tz,
  				enum thermal_notify_event event)

  {
  	int count;

  	if (atomic_read(&in_suspend))
  		return;

  	if (!tz->ops->get_temp)
  		return;

  	update_temperature(tz);

  	thermal_zone_set_trips(tz);

  	tz->notify_event = event;

  	for (count = 0; count < tz->trips; count++)
  		handle_thermal_trip(tz, count);
  }

  EXPORT_SYMBOL_GPL(thermal_zone_device_update);

  /**
   * thermal_notify_framework - Sensor drivers use this API to notify framework
   * @tz:		thermal zone device
   * @trip:	indicates which trip point has been crossed
   *
   * This function handles the trip events from sensor drivers. It starts
   * throttling the cooling devices according to the policy configured.
   * For CRITICAL and HOT trip points, this notifies the respective drivers,
   * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
   * The throttling policy is based on the configured platform data; if no
   * platform data is provided, this uses the step_wise throttling policy.
   */
  void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
  {
  	handle_thermal_trip(tz, trip);
  }
  EXPORT_SYMBOL_GPL(thermal_notify_framework);

  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, THERMAL_EVENT_UNSPECIFIED);

  }

  /*
   * Power actor section: interface to power actors to estimate power
   *
   * Set of functions used to interact to cooling devices that know
   * how to estimate their devices power consumption.
   */

  /**
   * power_actor_get_max_power() - get the maximum power that a cdev can consume
   * @cdev:	pointer to &thermal_cooling_device
   * @tz:		a valid thermal zone device pointer
   * @max_power:	pointer in which to store the maximum power
   *
   * Calculate the maximum power consumption in milliwats that the
   * cooling device can currently consume and store it in @max_power.
   *
   * Return: 0 on success, -EINVAL if @cdev doesn't support the
   * power_actor API or -E* on other error.
   */
  int power_actor_get_max_power(struct thermal_cooling_device *cdev,
  			      struct thermal_zone_device *tz, u32 *max_power)
  {
  	if (!cdev_is_power_actor(cdev))
  		return -EINVAL;
  
  	return cdev->ops->state2power(cdev, tz, 0, max_power);
  }
  
  /**

   * power_actor_get_min_power() - get the mainimum power that a cdev can consume
   * @cdev:	pointer to &thermal_cooling_device
   * @tz:		a valid thermal zone device pointer
   * @min_power:	pointer in which to store the minimum power
   *
   * Calculate the minimum power consumption in milliwatts that the
   * cooling device can currently consume and store it in @min_power.
   *
   * Return: 0 on success, -EINVAL if @cdev doesn't support the
   * power_actor API or -E* on other error.
   */
  int power_actor_get_min_power(struct thermal_cooling_device *cdev,
  			      struct thermal_zone_device *tz, u32 *min_power)
  {
  	unsigned long max_state;
  	int ret;
  
  	if (!cdev_is_power_actor(cdev))
  		return -EINVAL;
  
  	ret = cdev->ops->get_max_state(cdev, &max_state);
  	if (ret)
  		return ret;
  
  	return cdev->ops->state2power(cdev, tz, max_state, min_power);
  }
  
  /**

   * power_actor_set_power() - limit the maximum power a cooling device consumes

   * @cdev:	pointer to &thermal_cooling_device
   * @instance:	thermal instance to update
   * @power:	the power in milliwatts
   *

   * Set the cooling device to consume at most @power milliwatts. The limit is
   * expected to be a cap at the maximum power consumption.

   *
   * Return: 0 on success, -EINVAL if the cooling device does not
   * implement the power actor API or -E* for other failures.
   */
  int power_actor_set_power(struct thermal_cooling_device *cdev,
  			  struct thermal_instance *instance, u32 power)
  {
  	unsigned long state;
  	int ret;
  
  	if (!cdev_is_power_actor(cdev))
  		return -EINVAL;
  
  	ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
  	if (ret)
  		return ret;
  
  	instance->target = state;

  	mutex_lock(&cdev->lock);

  	cdev->updated = false;

  	mutex_unlock(&cdev->lock);

  	thermal_cdev_update(cdev);
  
  	return 0;
  }

  void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz,
  					  const char *cdev_type, size_t size)

  {

  	struct thermal_cooling_device *cdev = NULL;

  	mutex_lock(&thermal_list_lock);
  	list_for_each_entry(cdev, &thermal_cdev_list, node) {
  		/* skip non matching cdevs */
  		if (strncmp(cdev_type, cdev->type, size))
  			continue;
  
  		/* re binding the exception matching the type pattern */
  		thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev,
  						 THERMAL_NO_LIMIT,
  						 THERMAL_NO_LIMIT,
  						 THERMAL_WEIGHT_DEFAULT);
  	}
  	mutex_unlock(&thermal_list_lock);

  }

  void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,
  					  const char *cdev_type, size_t size)

  {

  	struct thermal_cooling_device *cdev = NULL;

  	mutex_lock(&thermal_list_lock);
  	list_for_each_entry(cdev, &thermal_cdev_list, node) {
  		/* skip non matching cdevs */
  		if (strncmp(cdev_type, cdev->type, size))
  			continue;
  		/* unbinding the exception matching the type pattern */
  		thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE,
  						   cdev);
  	}
  	mutex_unlock(&thermal_list_lock);

  }

  /*
   * Device management section: cooling devices, zones devices, and binding
   *
   * Set of functions provided by the thermal core for:
   * - cooling devices lifecycle: registration, unregistration,
   *				binding, and unbinding.
   * - thermal zone devices lifecycle: registration, unregistration,
   *				     binding, and unbinding.
   */

  
  /**

   * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
   * @tz:		pointer to struct thermal_zone_device

   * @trip:	indicates which trip point the cooling devices is
   *		associated with in this thermal zone.

   * @cdev:	pointer to struct thermal_cooling_device
   * @upper:	the Maximum cooling state for this trip point.
   *		THERMAL_NO_LIMIT means no upper limit,
   *		and the cooling device can be in max_state.
   * @lower:	the Minimum cooling state can be used for this trip point.
   *		THERMAL_NO_LIMIT means no lower limit,
   *		and the cooling device can be in cooling state 0.

   * @weight:	The weight of the cooling device to be bound to the
   *		thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
   *		default value

   *

   * This interface function bind a thermal cooling device to the certain trip
   * point of a thermal zone device.

   * This function is usually called in the thermal zone device .bind callback.

   *
   * Return: 0 on success, the proper error value otherwise.

   */
  int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
  				     int trip,

  				     struct thermal_cooling_device *cdev,

  				     unsigned long upper, unsigned long lower,
  				     unsigned int weight)

  {

  	struct thermal_instance *dev;
  	struct thermal_instance *pos;

  	struct thermal_zone_device *pos1;
  	struct thermal_cooling_device *pos2;

  	unsigned long max_state;

  	int result, ret;

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

  		return -EINVAL;

  	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)

  		return -EINVAL;

  	ret = cdev->ops->get_max_state(cdev, &max_state);
  	if (ret)
  		return ret;

  
  	/* 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;

  	dev = kzalloc(sizeof(*dev), GFP_KERNEL);

  	if (!dev)
  		return -ENOMEM;
  	dev->tz = tz;
  	dev->cdev = cdev;
  	dev->trip = trip;

  	dev->upper = upper;
  	dev->lower = lower;

  	dev->target = THERMAL_NO_TARGET;

  	dev->weight = weight;

  	result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL);
  	if (result < 0)

  		goto free_mem;

  	dev->id = result;

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

  		goto release_ida;

  
  	sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);

  	sysfs_attr_init(&dev->attr.attr);

  	dev->attr.attr.name = dev->attr_name;
  	dev->attr.attr.mode = 0444;

  	dev->attr.show = trip_point_show;

  	result = device_create_file(&tz->device, &dev->attr);
  	if (result)
  		goto remove_symbol_link;

  	sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
  	sysfs_attr_init(&dev->weight_attr.attr);
  	dev->weight_attr.attr.name = dev->weight_attr_name;
  	dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;

  	dev->weight_attr.show = weight_show;
  	dev->weight_attr.store = weight_store;

  	result = device_create_file(&tz->device, &dev->weight_attr);
  	if (result)
  		goto remove_trip_file;

  	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) {
  			result = -EEXIST;
  			break;
  		}

  	if (!result) {

  		list_add_tail(&dev->tz_node, &tz->thermal_instances);

  		list_add_tail(&dev->cdev_node, &cdev->thermal_instances);

  		atomic_set(&tz->need_update, 1);

  	}

  	mutex_unlock(&cdev->lock);

  	mutex_unlock(&tz->lock);
  
  	if (!result)
  		return 0;

  	device_remove_file(&tz->device, &dev->weight_attr);
  remove_trip_file:

  	device_remove_file(&tz->device, &dev->attr);

  remove_symbol_link:

  	sysfs_remove_link(&tz->device.kobj, dev->name);

  release_ida:
  	ida_simple_remove(&tz->ida, dev->id);

  free_mem:

  	kfree(dev);
  	return result;
  }

  EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);

  
  /**

   * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
   *					  thermal zone.
   * @tz:		pointer to a struct thermal_zone_device.

   * @trip:	indicates which trip point the cooling devices is
   *		associated with in this thermal zone.

   * @cdev:	pointer to a struct thermal_cooling_device.

   *

   * This interface function unbind a thermal cooling device from the certain
   * trip point of a thermal zone device.

   * This function is usually called in the thermal zone device .unbind callback.

   *
   * Return: 0 on success, the proper error value otherwise.

   */
  int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
  				       int trip,
  				       struct thermal_cooling_device *cdev)
  {

  	struct thermal_instance *pos, *next;

  
  	mutex_lock(&tz->lock);

  	mutex_lock(&cdev->lock);

  	list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {

  		if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {

  			list_del(&pos->tz_node);

  			list_del(&pos->cdev_node);

  			mutex_unlock(&cdev->lock);

  			mutex_unlock(&tz->lock);
  			goto unbind;
  		}
  	}

  	mutex_unlock(&cdev->lock);

  	mutex_unlock(&tz->lock);
  
  	return -ENODEV;

  unbind:

  	device_remove_file(&tz->device, &pos->weight_attr);

  	device_remove_file(&tz->device, &pos->attr);
  	sysfs_remove_link(&tz->device.kobj, pos->name);

  	ida_simple_remove(&tz->ida, pos->id);

  	kfree(pos);
  	return 0;
  }

  EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);

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

  	if (!strncmp(dev_name(dev), "thermal_zone",
  		     sizeof("thermal_zone") - 1)) {

  		tz = to_thermal_zone(dev);

  		thermal_zone_destroy_device_groups(tz);

  		kfree(tz);

  	} else if (!strncmp(dev_name(dev), "cooling_device",
  			    sizeof("cooling_device") - 1)) {

  		cdev = to_cooling_device(dev);
  		kfree(cdev);
  	}
  }
  
  static struct class thermal_class = {
  	.name = "thermal",
  	.dev_release = thermal_release,
  };

  static inline
  void print_bind_err_msg(struct thermal_zone_device *tz,
  			struct thermal_cooling_device *cdev, int ret)

  {
  	dev_err(&tz->device, "binding zone %s with cdev %s failed:%d
  ",
  		tz->type, cdev->type, ret);
  }
  
  static void __bind(struct thermal_zone_device *tz, int mask,
  		   struct thermal_cooling_device *cdev,
  		   unsigned long *limits,
  		   unsigned int weight)
  {
  	int i, ret;
  
  	for (i = 0; i < tz->trips; i++) {
  		if (mask & (1 << i)) {
  			unsigned long upper, lower;
  
  			upper = THERMAL_NO_LIMIT;
  			lower = THERMAL_NO_LIMIT;
  			if (limits) {
  				lower = limits[i * 2];
  				upper = limits[i * 2 + 1];
  			}
  			ret = thermal_zone_bind_cooling_device(tz, i, cdev,
  							       upper, lower,
  							       weight);
  			if (ret)
  				print_bind_err_msg(tz, cdev, ret);
  		}
  	}
  }

  static void bind_cdev(struct thermal_cooling_device *cdev)
  {
  	int i, ret;
  	const struct thermal_zone_params *tzp;
  	struct thermal_zone_device *pos = NULL;
  
  	mutex_lock(&thermal_list_lock);
  
  	list_for_each_entry(pos, &thermal_tz_list, node) {
  		if (!pos->tzp && !pos->ops->bind)
  			continue;
  
  		if (pos->ops->bind) {
  			ret = pos->ops->bind(pos, cdev);
  			if (ret)
  				print_bind_err_msg(pos, cdev, ret);
  			continue;
  		}
  
  		tzp = pos->tzp;
  		if (!tzp || !tzp->tbp)
  			continue;
  
  		for (i = 0; i < tzp->num_tbps; i++) {
  			if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
  				continue;
  			if (tzp->tbp[i].match(pos, cdev))
  				continue;
  			tzp->tbp[i].cdev = cdev;
  			__bind(pos, tzp->tbp[i].trip_mask, cdev,
  			       tzp->tbp[i].binding_limits,
  			       tzp->tbp[i].weight);
  		}
  	}
  
  	mutex_unlock(&thermal_list_lock);
  }

  /**

   * __thermal_cooling_device_register() - register a new thermal cooling device
   * @np:		a pointer to a device tree node.

   * @type:	the thermal cooling device type.
   * @devdata:	device private data.
   * @ops:		standard thermal cooling devices callbacks.

   *
   * This interface function adds a new thermal cooling device (fan/processor/...)
   * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
   * to all the thermal zone devices registered at the same time.

   * It also gives the opportunity to link the cooling device to a device tree
   * node, so that it can be bound to a thermal zone created out of device tree.

   *
   * Return: a pointer to the created struct thermal_cooling_device or an
   * ERR_PTR. Caller must check return value with IS_ERR*() helpers.

   */

  static struct thermal_cooling_device *
  __thermal_cooling_device_register(struct device_node *np,

  				  const char *type, void *devdata,

  				  const struct thermal_cooling_device_ops *ops)

  {
  	struct thermal_cooling_device *cdev;

  	struct thermal_zone_device *pos = NULL;

  	int result;

  	if (type && strlen(type) >= THERMAL_NAME_LENGTH)

  		return ERR_PTR(-EINVAL);

  
  	if (!ops || !ops->get_max_state || !ops->get_cur_state ||

  	    !ops->set_cur_state)

  		return ERR_PTR(-EINVAL);

  	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);

  	if (!cdev)

  		return ERR_PTR(-ENOMEM);

  	result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL);
  	if (result < 0) {

  		kfree(cdev);

  		return ERR_PTR(result);

  	}

  	cdev->id = result;

  	strlcpy(cdev->type, type ? : "", sizeof(cdev->type));

  	mutex_init(&cdev->lock);

  	INIT_LIST_HEAD(&cdev->thermal_instances);

  	cdev->np = np;

  	cdev->ops = ops;

  	cdev->updated = false;

  	cdev->device.class = &thermal_class;
  	cdev->devdata = devdata;

  	thermal_cooling_device_setup_sysfs(cdev);

  	dev_set_name(&cdev->device, "cooling_device%d", cdev->id);

  	result = device_register(&cdev->device);
  	if (result) {

  		ida_simple_remove(&thermal_cdev_ida, cdev->id);

  		put_device(&cdev->device);

  		return ERR_PTR(result);

  	}

  	/* Add 'this' new cdev to the global cdev list */

  	mutex_lock(&thermal_list_lock);
  	list_add(&cdev->node, &thermal_cdev_list);

  	mutex_unlock(&thermal_list_lock);

  	/* Update binding information for 'this' new cdev */
  	bind_cdev(cdev);

  	mutex_lock(&thermal_list_lock);
  	list_for_each_entry(pos, &thermal_tz_list, node)
  		if (atomic_cmpxchg(&pos->need_update, 1, 0))

  			thermal_zone_device_update(pos,
  						   THERMAL_EVENT_UNSPECIFIED);

  	mutex_unlock(&thermal_list_lock);

  	return cdev;

  }

  
  /**
   * 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.
   *
   * This interface function adds a new thermal cooling device (fan/processor/...)
   * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
   * to all the thermal zone devices registered at the same time.
   *
   * Return: a pointer to the created struct thermal_cooling_device or an
   * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
   */
  struct thermal_cooling_device *

  thermal_cooling_device_register(const char *type, void *devdata,

  				const struct thermal_cooling_device_ops *ops)
  {
  	return __thermal_cooling_device_register(NULL, type, devdata, ops);
  }

  EXPORT_SYMBOL_GPL(thermal_cooling_device_register);

  
  /**

   * thermal_of_cooling_device_register() - register an OF thermal cooling device
   * @np:		a pointer to a device tree node.
   * @type:	the thermal cooling device type.
   * @devdata:	device private data.
   * @ops:		standard thermal cooling devices callbacks.
   *
   * This function will register a cooling device with device tree node reference.
   * This interface function adds a new thermal cooling device (fan/processor/...)
   * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
   * to all the thermal zone devices registered at the same time.
   *
   * Return: a pointer to the created struct thermal_cooling_device or an
   * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
   */
  struct thermal_cooling_device *
  thermal_of_cooling_device_register(struct device_node *np,

  				   const char *type, void *devdata,

  				   const struct thermal_cooling_device_ops *ops)
  {
  	return __thermal_cooling_device_register(np, type, devdata, ops);
  }
  EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);

  static void thermal_cooling_device_release(struct device *dev, void *res)
  {
  	thermal_cooling_device_unregister(
  				*(struct thermal_cooling_device **)res);
  }
  
  /**
   * devm_thermal_of_cooling_device_register() - register an OF thermal cooling
   *					       device
   * @dev:	a valid struct device pointer of a sensor device.
   * @np:		a pointer to a device tree node.
   * @type:	the thermal cooling device type.
   * @devdata:	device private data.
   * @ops:	standard thermal cooling devices callbacks.
   *
   * This function will register a cooling device with device tree node reference.
   * This interface function adds a new thermal cooling device (fan/processor/...)
   * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
   * to all the thermal zone devices registered at the same time.
   *
   * Return: a pointer to the created struct thermal_cooling_device or an
   * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
   */
  struct thermal_cooling_device *
  devm_thermal_of_cooling_device_register(struct device *dev,
  				struct device_node *np,
  				char *type, void *devdata,
  				const struct thermal_cooling_device_ops *ops)
  {
  	struct thermal_cooling_device **ptr, *tcd;
  
  	ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr),
  			   GFP_KERNEL);
  	if (!ptr)
  		return ERR_PTR(-ENOMEM);
  
  	tcd = __thermal_cooling_device_register(np, type, devdata, ops);
  	if (IS_ERR(tcd)) {
  		devres_free(ptr);
  		return tcd;
  	}
  
  	*ptr = tcd;
  	devres_add(dev, ptr);
  
  	return tcd;
  }
  EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);

  static void __unbind(struct thermal_zone_device *tz, int mask,
  		     struct thermal_cooling_device *cdev)
  {
  	int i;
  
  	for (i = 0; i < tz->trips; i++)
  		if (mask & (1 << i))
  			thermal_zone_unbind_cooling_device(tz, i, cdev);
  }

  /**

   * thermal_cooling_device_unregister - removes a thermal cooling device

   * @cdev:	the thermal cooling device to remove.
   *

   * thermal_cooling_device_unregister() must be called when a registered
   * thermal cooling device is no longer needed.

   */

  void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)

  {

  	int i;
  	const struct thermal_zone_params *tzp;

  	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);

  
  	/* Unbind all thermal zones associated with 'this' cdev */

  	list_for_each_entry(tz, &thermal_tz_list, node) {

  		if (tz->ops->unbind) {
  			tz->ops->unbind(tz, cdev);
  			continue;
  		}
  
  		if (!tz->tzp || !tz->tzp->tbp)

  			continue;

  
  		tzp = tz->tzp;
  		for (i = 0; i < tzp->num_tbps; i++) {
  			if (tzp->tbp[i].cdev == cdev) {
  				__unbind(tz, tzp->tbp[i].trip_mask, cdev);
  				tzp->tbp[i].cdev = NULL;
  			}
  		}

  	}

  	mutex_unlock(&thermal_list_lock);

  	ida_simple_remove(&thermal_cdev_ida, cdev->id);

  	device_del(&cdev->device);

  	thermal_cooling_device_destroy_sysfs(cdev);

  	put_device(&cdev->device);

  }

  EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);

  static void bind_tz(struct thermal_zone_device *tz)

  {

  	int i, ret;
  	struct thermal_cooling_device *pos = NULL;
  	const struct thermal_zone_params *tzp = tz->tzp;

  	if (!tzp && !tz->ops->bind)

  		return;

  	mutex_lock(&thermal_list_lock);

  	/* If there is ops->bind, try to use ops->bind */
  	if (tz->ops->bind) {
  		list_for_each_entry(pos, &thermal_cdev_list, node) {
  			ret = tz->ops->bind(tz, pos);
  			if (ret)
  				print_bind_err_msg(tz, pos, ret);

  		}

  		goto exit;

  	}

  	if (!tzp || !tzp->tbp)
  		goto exit;

  	list_for_each_entry(pos, &thermal_cdev_list, node) {
  		for (i = 0; i < tzp->num_tbps; i++) {
  			if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
  				continue;
  			if (tzp->tbp[i].match(tz, pos))
  				continue;
  			tzp->tbp[i].cdev = pos;
  			__bind(tz, tzp->tbp[i].trip_mask, pos,
  			       tzp->tbp[i].binding_limits,
  			       tzp->tbp[i].weight);

  		}

  	}

  exit:
  	mutex_unlock(&thermal_list_lock);

  }
  
  /**

   * 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

   * @mask:	a bit string indicating the writeablility of trip points

   * @devdata:	private device data
   * @ops:	standard thermal zone device callbacks

   * @tzp:	thermal zone platform parameters

   * @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)

   *

   * This interface function adds a new thermal zone device (sensor) to
   * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
   * thermal cooling devices registered at the same time.

   * thermal_zone_device_unregister() must be called when the device is no

   * longer needed. The passive cooling depends on the .get_trend() return value.

   *
   * Return: a pointer to the created struct thermal_zone_device or an
   * in case of error, an ERR_PTR. Caller must check return value with
   * IS_ERR*() helpers.

   */

  struct thermal_zone_device *
  thermal_zone_device_register(const char *type, int trips, int mask,
  			     void *devdata, struct thermal_zone_device_ops *ops,
  			     struct thermal_zone_params *tzp, int passive_delay,
  			     int polling_delay)

  {
  	struct thermal_zone_device *tz;

  	enum thermal_trip_type trip_type;

  	int trip_temp;

  	int id;

  	int result;
  	int count;

  	struct thermal_governor *governor;

  	if (!type || strlen(type) == 0) {
  		pr_err("Error: No thermal zone type defined
  ");

  		return ERR_PTR(-EINVAL);

  	}

  	if (type && strlen(type) >= THERMAL_NAME_LENGTH) {
  		pr_err("Error: Thermal zone name (%s) too long, should be under %d chars
  ",
  		       type, THERMAL_NAME_LENGTH);

  		return ERR_PTR(-EINVAL);

  	}

  	if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) {
  		pr_err("Error: Incorrect number of thermal trips
  ");

  		return ERR_PTR(-EINVAL);

  	}

  	if (!ops) {
  		pr_err("Error: Thermal zone device ops not defined
  ");

  		return ERR_PTR(-EINVAL);

  	}

  	if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))

  		return ERR_PTR(-EINVAL);

  	tz = kzalloc(sizeof(*tz), GFP_KERNEL);

  	if (!tz)

  		return ERR_PTR(-ENOMEM);

  	INIT_LIST_HEAD(&tz->thermal_instances);

  	ida_init(&tz->ida);

  	mutex_init(&tz->lock);

  	id = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL);
  	if (id < 0) {
  		result = id;

  		goto free_tz;

  	}

  	tz->id = id;

  	strlcpy(tz->type, type, sizeof(tz->type));

  	tz->ops = ops;

  	tz->tzp = tzp;

  	tz->device.class = &thermal_class;
  	tz->devdata = devdata;
  	tz->trips = trips;

  	tz->passive_delay = passive_delay;
  	tz->polling_delay = polling_delay;

  	/* sys I/F */

  	/* Add nodes that are always present via .groups */

  	result = thermal_zone_create_device_groups(tz, mask);
  	if (result)

  		goto remove_id;

  	/* A new thermal zone needs to be updated anyway. */
  	atomic_set(&tz->need_update, 1);

  	dev_set_name(&tz->device, "thermal_zone%d", tz->id);

  	result = device_register(&tz->device);

  	if (result)

  		goto release_device;

  	for (count = 0; count < trips; count++) {

  		if (tz->ops->get_trip_type(tz, count, &trip_type))
  			set_bit(count, &tz->trips_disabled);

  		if (tz->ops->get_trip_temp(tz, count, &trip_temp))
  			set_bit(count, &tz->trips_disabled);
  		/* Check for bogus trip points */
  		if (trip_temp == 0)
  			set_bit(count, &tz->trips_disabled);

  	}

  	/* Update 'this' zone's governor information */
  	mutex_lock(&thermal_governor_lock);
  
  	if (tz->tzp)

  		governor = __find_governor(tz->tzp->governor_name);

  	else

  		governor = def_governor;
  
  	result = thermal_set_governor(tz, governor);
  	if (result) {
  		mutex_unlock(&thermal_governor_lock);
  		goto unregister;
  	}

  
  	mutex_unlock(&thermal_governor_lock);

  	if (!tz->tzp || !tz->tzp->no_hwmon) {
  		result = thermal_add_hwmon_sysfs(tz);
  		if (result)
  			goto unregister;
  	}

  	mutex_lock(&thermal_list_lock);
  	list_add_tail(&tz->node, &thermal_tz_list);

  	mutex_unlock(&thermal_list_lock);

  	/* Bind cooling devices for this zone */
  	bind_tz(tz);

  	INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check);

  	thermal_zone_device_reset(tz);

  	/* Update the new thermal zone and mark it as already updated. */
  	if (atomic_cmpxchg(&tz->need_update, 1, 0))

  		thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);

  	return tz;

  unregister:

  	device_del(&tz->device);
  release_device:
  	put_device(&tz->device);
  	tz = NULL;

  remove_id:

  	ida_simple_remove(&thermal_tz_ida, id);

  free_tz:
  	kfree(tz);
  	return ERR_PTR(result);

  }

  EXPORT_SYMBOL_GPL(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)
  {

  	int i;
  	const struct thermal_zone_params *tzp;

  	struct thermal_cooling_device *cdev;
  	struct thermal_zone_device *pos = NULL;

  
  	if (!tz)
  		return;

  	tzp = tz->tzp;

  	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);

  
  	/* Unbind all cdevs associated with 'this' thermal zone */
  	list_for_each_entry(cdev, &thermal_cdev_list, node) {
  		if (tz->ops->unbind) {
  			tz->ops->unbind(tz, cdev);
  			continue;
  		}
  
  		if (!tzp || !tzp->tbp)
  			break;
  
  		for (i = 0; i < tzp->num_tbps; i++) {
  			if (tzp->tbp[i].cdev == cdev) {
  				__unbind(tz, tzp->tbp[i].trip_mask, cdev);
  				tzp->tbp[i].cdev = NULL;
  			}
  		}
  	}

  	mutex_unlock(&thermal_list_lock);

  	cancel_delayed_work_sync(&tz->poll_queue);

  	thermal_set_governor(tz, NULL);

  	thermal_remove_hwmon_sysfs(tz);

  	ida_simple_remove(&thermal_tz_ida, tz->id);
  	ida_destroy(&tz->ida);

  	mutex_destroy(&tz->lock);
  	device_unregister(&tz->device);

  }

  EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);

  /**
   * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
   * @name: thermal zone name to fetch the temperature
   *
   * When only one zone is found with the passed name, returns a reference to it.
   *
   * Return: On success returns a reference to an unique thermal zone with
   * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
   * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
   */
  struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
  {
  	struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
  	unsigned int found = 0;
  
  	if (!name)
  		goto exit;
  
  	mutex_lock(&thermal_list_lock);
  	list_for_each_entry(pos, &thermal_tz_list, node)

  		if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {

  			found++;
  			ref = pos;
  		}
  	mutex_unlock(&thermal_list_lock);
  
  	/* nothing has been found, thus an error code for it */
  	if (found == 0)
  		ref = ERR_PTR(-ENODEV);
  	else if (found > 1)
  	/* Success only when an unique zone is found */
  		ref = ERR_PTR(-EEXIST);
  
  exit:
  	return ref;
  }
  EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);

  #ifdef CONFIG_NET

  static const struct genl_multicast_group thermal_event_mcgrps[] = {
  	{ .name = THERMAL_GENL_MCAST_GROUP_NAME, },
  };

  static struct genl_family thermal_event_genl_family __ro_after_init = {

  	.module = THIS_MODULE,

  	.name = THERMAL_GENL_FAMILY_NAME,
  	.version = THERMAL_GENL_VERSION,
  	.maxattr = THERMAL_GENL_ATTR_MAX,

  	.mcgrps = thermal_event_mcgrps,
  	.n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),

  };

  int thermal_generate_netlink_event(struct thermal_zone_device *tz,

  				   enum events event)

  {
  	struct sk_buff *skb;
  	struct nlattr *attr;
  	struct thermal_genl_event *thermal_event;
  	void *msg_header;
  	int size;
  	int result;

  	static unsigned int thermal_event_seqnum;

  	if (!tz)
  		return -EINVAL;

  	/* allocate memory */

  	size = nla_total_size(sizeof(struct thermal_genl_event)) +
  	       nla_total_size(0);

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

  	attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
  			   sizeof(struct thermal_genl_event));

  
  	if (!attr) {
  		nlmsg_free(skb);
  		return -EINVAL;
  	}
  
  	thermal_event = nla_data(attr);
  	if (!thermal_event) {
  		nlmsg_free(skb);
  		return -EINVAL;
  	}
  
  	memset(thermal_event, 0, sizeof(struct thermal_genl_event));

  	thermal_event->orig = tz->id;

  	thermal_event->event = event;
  
  	/* send multicast genetlink message */

  	genlmsg_end(skb, msg_header);

  	result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,

  				   0, GFP_ATOMIC);

  	if (result)

  		dev_err(&tz->device, "Failed to send netlink event:%d", result);

  
  	return result;
  }

  EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);

  static int __init genetlink_init(void)

  {

  	return genl_register_family(&thermal_event_genl_family);

  }

  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 */

  static int thermal_pm_notify(struct notifier_block *nb,

  			     unsigned long mode, void *_unused)

  {
  	struct thermal_zone_device *tz;

  	enum thermal_device_mode tz_mode;

  
  	switch (mode) {
  	case PM_HIBERNATION_PREPARE:
  	case PM_RESTORE_PREPARE:
  	case PM_SUSPEND_PREPARE:
  		atomic_set(&in_suspend, 1);
  		break;
  	case PM_POST_HIBERNATION:
  	case PM_POST_RESTORE:
  	case PM_POST_SUSPEND:
  		atomic_set(&in_suspend, 0);
  		list_for_each_entry(tz, &thermal_tz_list, node) {

  			tz_mode = THERMAL_DEVICE_ENABLED;
  			if (tz->ops->get_mode)
  				tz->ops->get_mode(tz, &tz_mode);
  
  			if (tz_mode == THERMAL_DEVICE_DISABLED)
  				continue;

  			thermal_zone_device_init(tz);

  			thermal_zone_device_update(tz,
  						   THERMAL_EVENT_UNSPECIFIED);

  		}
  		break;
  	default:
  		break;
  	}
  	return 0;
  }
  
  static struct notifier_block thermal_pm_nb = {
  	.notifier_call = thermal_pm_notify,
  };

  static int __init thermal_init(void)
  {

  	int result;

  	mutex_init(&poweroff_lock);

  	result = thermal_register_governors();
  	if (result)
  		goto error;

  
  	result = class_register(&thermal_class);

  	if (result)
  		goto unregister_governors;

  	result = genetlink_init();

  	if (result)
  		goto unregister_class;

  	result = of_parse_thermal_zones();
  	if (result)
  		goto exit_netlink;

  	result = register_pm_notifier(&thermal_pm_nb);
  	if (result)
  		pr_warn("Thermal: Can not register suspend notifier, return %d
  ",
  			result);

  	return 0;

  exit_netlink:
  	genetlink_exit();

  unregister_class:
  	class_unregister(&thermal_class);

  unregister_governors:
  	thermal_unregister_governors();

  error:

  	ida_destroy(&thermal_tz_ida);
  	ida_destroy(&thermal_cdev_ida);

  	mutex_destroy(&thermal_list_lock);
  	mutex_destroy(&thermal_governor_lock);

  	mutex_destroy(&poweroff_lock);

  	return result;
  }

  fs_initcall(thermal_init);