the generic thermal sysfs driver

The Generic Thermal sysfs driver for thermal management.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Thomas Sujith <sujith.thomas@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

5 files changed, 737 insertions, 0 deletions

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 08d4ae201597..8e238cfc0795 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -58,6 +58,8 @@ source "drivers/power/Kconfig"
 
 source "drivers/hwmon/Kconfig"
 
+source "drivers/thermal/Kconfig"
+
 source "drivers/watchdog/Kconfig"
 
 source "drivers/ssb/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 0ee9a8a4095e..a516b8b19127 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -64,6 +64,7 @@ obj-y				+= i2c/
 obj-$(CONFIG_W1)                += w1/
 obj-$(CONFIG_POWER_SUPPLY)      += power/
 obj-$(CONFIG_HWMON)             += hwmon/
+obj-$(CONFIG_THERMAL)           += thermal/
 obj-$(CONFIG_WATCHDOG)          += watchdog/
 obj-$(CONFIG_PHONE)             += telephony/
 obj-$(CONFIG_MD)                += md/
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
new file mode 100644
index 000000000000..9b3f61200000
--- /dev/null
+++ b/drivers/thermal/Kconfig
@@ -0,0 +1,15 @@
+#
+# Generic thermal sysfs drivers configuration
+#
+
+menuconfig THERMAL
+        bool "Generic Thermal sysfs driver"
+        default y
+        help
+          Generic Thermal Sysfs driver offers a generic mechanism for
+          thermal management. Usually it's made up of one or more thermal
+          zone and cooling device.
+          each thermal zone contains its own temperature, trip points,
+          cooling devices.
+          All platforms with ACPI thermal support can use this driver.
+          If you want this support, you should say Y here
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
new file mode 100644
index 000000000000..8ef1232de376
--- /dev/null
+++ b/drivers/thermal/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for sensor chip drivers.
+#
+
+obj-$(CONFIG_THERMAL)           += thermal.o
diff --git a/drivers/thermal/thermal.c b/drivers/thermal/thermal.c
new file mode 100644
index 000000000000..3273e348fd14
--- /dev/null
+++ b/drivers/thermal/thermal.c
@@ -0,0 +1,714 @@
+/*
+ *  thermal.c - Generic Thermal Management Sysfs support.
+ *
+ *  Copyright (C) 2008 Intel Corp
+ *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
+ *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
+ *
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/kdev_t.h>
+#include <linux/idr.h>
+#include <linux/thermal.h>
+#include <linux/spinlock.h>
+
+MODULE_AUTHOR("Zhang Rui")
+MODULE_DESCRIPTION("Generic thermal management sysfs support");
+MODULE_LICENSE("GPL");
+
+#define PREFIX "Thermal: "
+
+struct thermal_cooling_device_instance {
+        int id;
+        char name[THERMAL_NAME_LENGTH];
+        struct thermal_zone_device *tz;
+        struct thermal_cooling_device *cdev;
+        int trip;
+        char attr_name[THERMAL_NAME_LENGTH];
+        struct device_attribute attr;
+        struct list_head node;
+};
+
+static DEFINE_IDR(thermal_tz_idr);
+static DEFINE_IDR(thermal_cdev_idr);
+static DEFINE_MUTEX(thermal_idr_lock);
+
+static LIST_HEAD(thermal_tz_list);
+static LIST_HEAD(thermal_cdev_list);
+static DEFINE_MUTEX(thermal_list_lock);
+
+static int get_idr(struct idr *idr, struct mutex *lock, int *id)
+{
+        int err;
+
+      again:
+        if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
+                return -ENOMEM;
+
+        if (lock)
+                mutex_lock(lock);
+        err = idr_get_new(idr, NULL, id);
+        if (lock)
+                mutex_unlock(lock);
+        if (unlikely(err == -EAGAIN))
+                goto again;
+        else if (unlikely(err))
+                return err;
+
+        *id = *id & MAX_ID_MASK;
+        return 0;
+}
+
+static void release_idr(struct idr *idr, struct mutex *lock, int id)
+{
+        if (lock)
+                mutex_lock(lock);
+        idr_remove(idr, id);
+        if (lock)
+                mutex_unlock(lock);
+}
+
+/* sys I/F for thermal zone */
+
+#define to_thermal_zone(_dev) \
+        container_of(_dev, struct thermal_zone_device, device)
+
+static ssize_t
+type_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct thermal_zone_device *tz = to_thermal_zone(dev);
+
+        return sprintf(buf, "%s\n", tz->type);
+}
+
+static ssize_t
+temp_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct thermal_zone_device *tz = to_thermal_zone(dev);
+
+        if (!tz->ops->get_temp)
+                return -EPERM;
+
+        return tz->ops->get_temp(tz, buf);
+}
+
+static ssize_t
+mode_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct thermal_zone_device *tz = to_thermal_zone(dev);
+
+        if (!tz->ops->get_mode)
+                return -EPERM;
+
+        return tz->ops->get_mode(tz, buf);
+}
+
+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;
+
+        result = tz->ops->set_mode(tz, buf);
+        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);
+        int trip;
+
+        if (!tz->ops->get_trip_type)
+                return -EPERM;
+
+        if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
+                return -EINVAL;
+
+        return tz->ops->get_trip_type(tz, trip, buf);
+}
+
+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);
+        int trip;
+
+        if (!tz->ops->get_trip_temp)
+                return -EPERM;
+
+        if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
+                return -EINVAL;
+
+        return tz->ops->get_trip_temp(tz, trip, buf);
+}
+
+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);
+
+static struct device_attribute trip_point_attrs[] = {
+        __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
+        __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
+        __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
+};
+
+#define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
+do {    \
+        result = device_create_file(_dev,       \
+                                &trip_point_attrs[_index * 2]); \
+        if (result)     \
+                break;  \
+        result = device_create_file(_dev,       \
+                        &trip_point_attrs[_index * 2 + 1]);     \
+} while (0)
+
+#define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
+do {    \
+        device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
+        device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
+} while (0)
+
+/* sys I/F for cooling device */
+#define to_cooling_device(_dev) \
+        container_of(_dev, struct thermal_cooling_device, device)
+
+static ssize_t
+thermal_cooling_device_type_show(struct device *dev,
+                                 struct device_attribute *attr, char *buf)
+{
+        struct thermal_cooling_device *cdev = to_cooling_device(dev);
+
+        return sprintf(buf, "%s\n", cdev->type);
+}
+
+static ssize_t
+thermal_cooling_device_max_state_show(struct device *dev,
+                                      struct device_attribute *attr, char *buf)
+{
+        struct thermal_cooling_device *cdev = to_cooling_device(dev);
+
+        return cdev->ops->get_max_state(cdev, buf);
+}
+
+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);
+
+        return cdev->ops->get_cur_state(cdev, buf);
+}
+
+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);
+        int state;
+        int result;
+
+        if (!sscanf(buf, "%d\n", &state))
+                return -EINVAL;
+
+        if (state < 0)
+                return -EINVAL;
+
+        result = cdev->ops->set_cur_state(cdev, state);
+        if (result)
+                return result;
+        return count;
+}
+
+static struct device_attribute dev_attr_cdev_type =
+                __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
+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,
+                                    struct device_attribute *attr, char *buf)
+{
+        struct thermal_cooling_device_instance *instance;
+
+        instance =
+            container_of(attr, struct thermal_cooling_device_instance, attr);
+
+        if (instance->trip == THERMAL_TRIPS_NONE)
+                return sprintf(buf, "-1\n");
+        else
+                return sprintf(buf, "%d\n", instance->trip);
+}
+
+/* Device management */
+
+/**
+ * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
+ * this function is usually called in the thermal zone device .bind callback.
+ * @tz:         thermal zone device
+ * @trip:       indicates which trip point the cooling devices is
+ *              associated with in this thermal zone.
+ * @cdev:       thermal cooling device
+ */
+int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
+                                     int trip,
+                                     struct thermal_cooling_device *cdev)
+{
+        struct thermal_cooling_device_instance *dev;
+        struct thermal_cooling_device_instance *pos;
+        int result;
+
+        if (trip >= tz->trips ||
+            (trip < 0 && trip != THERMAL_TRIPS_NONE))
+                return -EINVAL;
+
+        if (!tz || !cdev)
+                return -EINVAL;
+
+        dev =
+            kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
+        if (!dev)
+                return -ENOMEM;
+        dev->tz = tz;
+        dev->cdev = cdev;
+        dev->trip = trip;
+        result = get_idr(&tz->idr, &tz->lock, &dev->id);
+        if (result)
+                goto free_mem;
+
+        sprintf(dev->name, "cdev%d", dev->id);
+        result =
+            sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
+        if (result)
+                goto release_idr;
+
+        sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
+        dev->attr.attr.name = dev->attr_name;
+        dev->attr.attr.mode = 0444;
+        dev->attr.show = thermal_cooling_device_trip_point_show;
+        result = device_create_file(&tz->device, &dev->attr);
+        if (result)
+                goto remove_symbol_link;
+
+        mutex_lock(&tz->lock);
+        list_for_each_entry(pos, &tz->cooling_devices, node)
+            if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
+                result = -EEXIST;
+                break;
+        }
+        if (!result)
+                list_add_tail(&dev->node, &tz->cooling_devices);
+        mutex_unlock(&tz->lock);
+
+        if (!result)
+                return 0;
+
+        device_remove_file(&tz->device, &dev->attr);
+      remove_symbol_link:
+        sysfs_remove_link(&tz->device.kobj, dev->name);
+      release_idr:
+        release_idr(&tz->idr, &tz->lock, dev->id);
+      free_mem:
+        kfree(dev);
+        return result;
+}
+EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
+
+/**
+ * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
+ * this function is usually called in the thermal zone device .unbind callback.
+ * @tz:         thermal zone device
+ * @trip:       indicates which trip point the cooling devices is
+ *              associated with in this thermal zone.
+ * @cdev:       thermal cooling device
+ */
+int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
+                                       int trip,
+                                       struct thermal_cooling_device *cdev)
+{
+        struct thermal_cooling_device_instance *pos, *next;
+
+        mutex_lock(&tz->lock);
+        list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
+                if (pos->tz == tz && pos->trip == trip
+                    && pos->cdev == cdev) {
+                        list_del(&pos->node);
+                        mutex_unlock(&tz->lock);
+                        goto unbind;
+                }
+        }
+        mutex_unlock(&tz->lock);
+
+        return -ENODEV;
+
+      unbind:
+        device_remove_file(&tz->device, &pos->attr);
+        sysfs_remove_link(&tz->device.kobj, pos->name);
+        release_idr(&tz->idr, &tz->lock, pos->id);
+        kfree(pos);
+        return 0;
+}
+EXPORT_SYMBOL(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->bus_id, "thermal_zone", sizeof "thermal_zone" - 1)) {
+                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.
+ */
+struct thermal_cooling_device *thermal_cooling_device_register(char *type,
+                       void *devdata, struct thermal_cooling_device_ops *ops)
+{
+        struct thermal_cooling_device *cdev;
+        struct thermal_zone_device *pos;
+        int result;
+
+        if (strlen(type) >= THERMAL_NAME_LENGTH)
+                return NULL;
+
+        if (!ops || !ops->get_max_state || !ops->get_cur_state ||
+                !ops->set_cur_state)
+                return NULL;
+
+        cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
+        if (!cdev)
+                return NULL;
+
+        result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
+        if (result) {
+                kfree(cdev);
+                return NULL;
+        }
+
+        strcpy(cdev->type, type);
+        cdev->ops = ops;
+        cdev->device.class = &thermal_class;
+        cdev->devdata = devdata;
+        sprintf(cdev->device.bus_id, "cooling_device%d", cdev->id);
+        result = device_register(&cdev->device);
+        if (result) {
+                release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
+                kfree(cdev);
+                return NULL;
+        }
+
+        /* sys I/F */
+        if (type) {
+                result = device_create_file(&cdev->device,
+                                            &dev_attr_cdev_type);
+                if (result)
+                        goto unregister;
+        }
+
+        result = device_create_file(&cdev->device, &dev_attr_max_state);
+        if (result)
+                goto unregister;
+
+        result = device_create_file(&cdev->device, &dev_attr_cur_state);
+        if (result)
+                goto unregister;
+
+        mutex_lock(&thermal_list_lock);
+        list_add(&cdev->node, &thermal_cdev_list);
+        list_for_each_entry(pos, &thermal_tz_list, node) {
+                if (!pos->ops->bind)
+                        continue;
+                result = pos->ops->bind(pos, cdev);
+                if (result)
+                        break;
+
+        }
+        mutex_unlock(&thermal_list_lock);
+
+        if (!result)
+                return cdev;
+
+      unregister:
+        release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
+        device_unregister(&cdev->device);
+        return NULL;
+}
+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])
+                device_remove_file(&cdev->device,
+                                   &dev_attr_cdev_type);
+        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);
+
+/**
+ * thermal_zone_device_register - register a new thermal zone device
+ * @type:       the thermal zone device type
+ * @trips:      the number of trip points the thermal zone support
+ * @devdata:    private device data
+ * @ops:        standard thermal zone device callbacks
+ *
+ * thermal_zone_device_unregister() must be called when the device is no
+ * longer needed.
+ */
+struct thermal_zone_device *thermal_zone_device_register(char *type,
+                                        int trips, void *devdata,
+                                        struct thermal_zone_device_ops *ops)
+{
+        struct thermal_zone_device *tz;
+        struct thermal_cooling_device *pos;
+        int result;
+        int count;
+
+        if (strlen(type) >= THERMAL_NAME_LENGTH)
+                return NULL;
+
+        if (trips > THERMAL_MAX_TRIPS || trips < 0)
+                return NULL;
+
+        if (!ops || !ops->get_temp)
+                return NULL;
+
+        tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
+        if (!tz)
+                return NULL;
+
+        INIT_LIST_HEAD(&tz->cooling_devices);
+        idr_init(&tz->idr);
+        mutex_init(&tz->lock);
+        result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
+        if (result) {
+                kfree(tz);
+                return NULL;
+        }
+
+        strcpy(tz->type, type);
+        tz->ops = ops;
+        tz->device.class = &thermal_class;
+        tz->devdata = devdata;
+        tz->trips = trips;
+        sprintf(tz->device.bus_id, "thermal_zone%d", tz->id);
+        result = device_register(&tz->device);
+        if (result) {
+                release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
+                kfree(tz);
+                return NULL;
+        }
+
+        /* sys I/F */
+        if (type) {
+                result = device_create_file(&tz->device, &dev_attr_type);
+                if (result)
+                        goto unregister;
+        }
+
+        result = device_create_file(&tz->device, &dev_attr_temp);
+        if (result)
+                goto unregister;
+
+        if (ops->get_mode) {
+                result = device_create_file(&tz->device, &dev_attr_mode);
+                if (result)
+                        goto unregister;
+        }
+
+        for (count = 0; count < trips; count++) {
+                TRIP_POINT_ATTR_ADD(&tz->device, count, result);
+                if (result)
+                        goto unregister;
+        }
+
+        mutex_lock(&thermal_list_lock);
+        list_add_tail(&tz->node, &thermal_tz_list);
+        if (ops->bind)
+                list_for_each_entry(pos, &thermal_cdev_list, node) {
+                        result = ops->bind(tz, pos);
+                        if (result)
+                                break;
+                }
+        mutex_unlock(&thermal_list_lock);
+
+        if (!result)
+                return tz;
+
+      unregister:
+        release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
+        device_unregister(&tz->device);
+        return NULL;
+}
+EXPORT_SYMBOL(thermal_zone_device_register);
+
+/**
+ * thermal_device_unregister - removes the registered thermal zone device
+ *
+ * @tz: the thermal zone device to remove
+ */
+void thermal_zone_device_unregister(struct thermal_zone_device *tz)
+{
+        struct thermal_cooling_device *cdev;
+        struct thermal_zone_device *pos = NULL;
+        int count;
+
+        if (!tz)
+                return;
+
+        mutex_lock(&thermal_list_lock);
+        list_for_each_entry(pos, &thermal_tz_list, node)
+            if (pos == tz)
+                break;
+        if (pos != tz) {
+                /* thermal zone device not found */
+                mutex_unlock(&thermal_list_lock);
+                return;
+        }
+        list_del(&tz->node);
+        if (tz->ops->unbind)
+                list_for_each_entry(cdev, &thermal_cdev_list, node)
+                    tz->ops->unbind(tz, cdev);
+        mutex_unlock(&thermal_list_lock);
+
+        if (tz->type[0])
+                device_remove_file(&tz->device, &dev_attr_type);
+        device_remove_file(&tz->device, &dev_attr_temp);
+        if (tz->ops->get_mode)
+                device_remove_file(&tz->device, &dev_attr_mode);
+
+        for (count = 0; count < tz->trips; count++)
+                TRIP_POINT_ATTR_REMOVE(&tz->device, count);
+
+        release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
+        idr_destroy(&tz->idr);
+        mutex_destroy(&tz->lock);
+        device_unregister(&tz->device);
+        return;
+}
+EXPORT_SYMBOL(thermal_zone_device_unregister);
+
+static int __init thermal_init(void)
+{
+        int result = 0;
+
+        result = class_register(&thermal_class);
+        if (result) {
+                idr_destroy(&thermal_tz_idr);
+                idr_destroy(&thermal_cdev_idr);
+                mutex_destroy(&thermal_idr_lock);
+                mutex_destroy(&thermal_list_lock);
+        }
+        return result;
+}
+
+static void __exit thermal_exit(void)
+{
+        class_unregister(&thermal_class);
+        idr_destroy(&thermal_tz_idr);
+        idr_destroy(&thermal_cdev_idr);
+        mutex_destroy(&thermal_idr_lock);
+        mutex_destroy(&thermal_list_lock);
+}
+
+subsys_initcall(thermal_init);
+module_exit(thermal_exit);