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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Backlight Lowlevel Control Abstraction
  *
  * Copyright (C) 2003,2004 Hewlett-Packard Company
  *
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/backlight.h>
 #include <linux/notifier.h>
 #include <linux/ctype.h>
 #include <linux/err.h>
 #include <linux/fb.h>
 #include <linux/slab.h>
 
 #ifdef CONFIG_PMAC_BACKLIGHT
 #include <asm/backlight.h>
 #endif
 
 /**
  * DOC: overview
  *
  * The backlight core supports implementing backlight drivers.
  *
  * A backlight driver registers a driver using
  * devm_backlight_device_register(). The properties of the backlight
  * driver such as type and max_brightness must be specified.
  * When the core detect changes in for example brightness or power state
  * the update_status() operation is called. The backlight driver shall
  * implement this operation and use it to adjust backlight.
  *
  * Several sysfs attributes are provided by the backlight core::
  *
  * - brightness         R/W, set the requested brightness level
  * - actual_brightness  RO, the brightness level used by the HW
  * - max_brightness     RO, the maximum  brightness level supported
  *
  * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
  *
  * The backlight can be adjusted using the sysfs interface, and
  * the backlight driver may also support adjusting backlight using
  * a hot-key or some other platform or firmware specific way.
  *
  * The driver must implement the get_brightness() operation if
  * the HW do not support all the levels that can be specified in
  * brightness, thus providing user-space access to the actual level
  * via the actual_brightness attribute.
  *
  * When the backlight changes this is reported to user-space using
  * an uevent connected to the actual_brightness attribute.
  * When brightness is set by platform specific means, for example
  * a hot-key to adjust backlight, the driver must notify the backlight
  * core that brightness has changed using backlight_force_update().
  *
  * The backlight driver core receives notifications from fbdev and
  * if the event is FB_EVENT_BLANK and if the value of blank, from the
  * FBIOBLANK ioctrl, results in a change in the backlight state the
  * update_status() operation is called.
  */
 
 static struct list_head backlight_dev_list;
 static struct mutex backlight_dev_list_mutex;
 static struct blocking_notifier_head backlight_notifier;
 
 static const char *const backlight_types[] = {
     [BACKLIGHT_RAW] = "raw",
     [BACKLIGHT_PLATFORM] = "platform",
     [BACKLIGHT_FIRMWARE] = "firmware",
 };
 
 static const char *const backlight_scale_types[] = {
     [BACKLIGHT_SCALE_UNKNOWN]   = "unknown",
     [BACKLIGHT_SCALE_LINEAR]    = "linear",
     [BACKLIGHT_SCALE_NON_LINEAR]    = "non-linear",
 };
 
 #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
                defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
 /*
  * fb_notifier_callback
  *
  * This callback gets called when something important happens inside a
  * framebuffer driver. The backlight core only cares about FB_BLANK_UNBLANK
  * which is reported to the driver using backlight_update_status()
  * as a state change.
  *
  * There may be several fbdev's connected to the backlight device,
  * in which case they are kept track of. A state change is only reported
  * if there is a change in backlight for the specified fbdev.
  */
 static int fb_notifier_callback(struct notifier_block *self,
                 unsigned long event, void *data)
 {
     struct backlight_device *bd;
     struct fb_event *evdata = data;
     int node = evdata->info->node;
     int fb_blank = 0;
 
     /* If we aren't interested in this event, skip it immediately ... */
     if (event != FB_EVENT_BLANK)
         return 0;
 
     bd = container_of(self, struct backlight_device, fb_notif);
     mutex_lock(&bd->ops_lock);
 
     if (!bd->ops)
         goto out;
     if (bd->ops->check_fb && !bd->ops->check_fb(bd, evdata->info))
         goto out;
 
     fb_blank = *(int *)evdata->data;
     if (fb_blank == FB_BLANK_UNBLANK && !bd->fb_bl_on[node]) {
         bd->fb_bl_on[node] = true;
         if (!bd->use_count++) {
             bd->props.state &= ~BL_CORE_FBBLANK;
             bd->props.fb_blank = FB_BLANK_UNBLANK;
             backlight_update_status(bd);
         }
     } else if (fb_blank != FB_BLANK_UNBLANK && bd->fb_bl_on[node]) {
         bd->fb_bl_on[node] = false;
         if (!(--bd->use_count)) {
             bd->props.state |= BL_CORE_FBBLANK;
             bd->props.fb_blank = fb_blank;
             backlight_update_status(bd);
         }
     }
 out:
     mutex_unlock(&bd->ops_lock);
     return 0;
 }
 
 static int backlight_register_fb(struct backlight_device *bd)
 {
     memset(&bd->fb_notif, 0, sizeof(bd->fb_notif));
     bd->fb_notif.notifier_call = fb_notifier_callback;
 
     return fb_register_client(&bd->fb_notif);
 }
 
 static void backlight_unregister_fb(struct backlight_device *bd)
 {
     fb_unregister_client(&bd->fb_notif);
 }
 #else
 static inline int backlight_register_fb(struct backlight_device *bd)
 {
     return 0;
 }
 
 static inline void backlight_unregister_fb(struct backlight_device *bd)
 {
 }
 #endif /* CONFIG_FB */
 
 static void backlight_generate_event(struct backlight_device *bd,
                      enum backlight_update_reason reason)
 {
     char *envp[2];
 
     switch (reason) {
     case BACKLIGHT_UPDATE_SYSFS:
         envp[0] = "SOURCE=sysfs";
         break;
     case BACKLIGHT_UPDATE_HOTKEY:
         envp[0] = "SOURCE=hotkey";
         break;
     default:
         envp[0] = "SOURCE=unknown";
         break;
     }
     envp[1] = NULL;
     kobject_uevent_env(&bd->dev.kobj, KOBJ_CHANGE, envp);
     sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness");
 }
 
 static ssize_t bl_power_show(struct device *dev, struct device_attribute *attr,
         char *buf)
 {
     struct backlight_device *bd = to_backlight_device(dev);
 
     return sprintf(buf, "%d\n", bd->props.power);
 }
 
 static ssize_t bl_power_store(struct device *dev, struct device_attribute *attr,
         const char *buf, size_t count)
 {
     int rc;
     struct backlight_device *bd = to_backlight_device(dev);
     unsigned long power, old_power;
 
     rc = kstrtoul(buf, 0, &power);
     if (rc)
         return rc;
 
     rc = -ENXIO;
     mutex_lock(&bd->ops_lock);
     if (bd->ops) {
         pr_debug("set power to %lu\n", power);
         if (bd->props.power != power) {
             old_power = bd->props.power;
             bd->props.power = power;
             rc = backlight_update_status(bd);
             if (rc)
                 bd->props.power = old_power;
             else
                 rc = count;
         } else {
             rc = count;
         }
     }
     mutex_unlock(&bd->ops_lock);
 
     return rc;
 }
 static DEVICE_ATTR_RW(bl_power);
 
 static ssize_t brightness_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct backlight_device *bd = to_backlight_device(dev);
 
     return sprintf(buf, "%d\n", bd->props.brightness);
 }
 
 int backlight_device_set_brightness(struct backlight_device *bd,
                     unsigned long brightness)
 {
     int rc = -ENXIO;
 
     mutex_lock(&bd->ops_lock);
     if (bd->ops) {
         if (brightness > bd->props.max_brightness)
             rc = -EINVAL;
         else {
             pr_debug("set brightness to %lu\n", brightness);
             bd->props.brightness = brightness;
             rc = backlight_update_status(bd);
         }
     }
     mutex_unlock(&bd->ops_lock);
 
     backlight_generate_event(bd, BACKLIGHT_UPDATE_SYSFS);
 
     return rc;
 }
 EXPORT_SYMBOL(backlight_device_set_brightness);
 
 static ssize_t brightness_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t count)
 {
     int rc;
     struct backlight_device *bd = to_backlight_device(dev);
     unsigned long brightness;
 
     rc = kstrtoul(buf, 0, &brightness);
     if (rc)
         return rc;
 
     rc = backlight_device_set_brightness(bd, brightness);
 
     return rc ? rc : count;
 }
 static DEVICE_ATTR_RW(brightness);
 
 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
         char *buf)
 {
     struct backlight_device *bd = to_backlight_device(dev);
 
     return sprintf(buf, "%s\n", backlight_types[bd->props.type]);
 }
 static DEVICE_ATTR_RO(type);
 
 static ssize_t max_brightness_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct backlight_device *bd = to_backlight_device(dev);
 
     return sprintf(buf, "%d\n", bd->props.max_brightness);
 }
 static DEVICE_ATTR_RO(max_brightness);
 
 static ssize_t actual_brightness_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     int rc = -ENXIO;
     struct backlight_device *bd = to_backlight_device(dev);
 
     mutex_lock(&bd->ops_lock);
     if (bd->ops && bd->ops->get_brightness) {
         rc = bd->ops->get_brightness(bd);
         if (rc >= 0)
             rc = sprintf(buf, "%d\n", rc);
     } else {
         rc = sprintf(buf, "%d\n", bd->props.brightness);
     }
     mutex_unlock(&bd->ops_lock);
 
     return rc;
 }
 static DEVICE_ATTR_RO(actual_brightness);
 
 static ssize_t scale_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct backlight_device *bd = to_backlight_device(dev);
 
     if (WARN_ON(bd->props.scale > BACKLIGHT_SCALE_NON_LINEAR))
         return sprintf(buf, "unknown\n");
 
     return sprintf(buf, "%s\n", backlight_scale_types[bd->props.scale]);
 }
 static DEVICE_ATTR_RO(scale);
 
 static struct class *backlight_class;
 
 #ifdef CONFIG_PM_SLEEP
 static int backlight_suspend(struct device *dev)
 {
     struct backlight_device *bd = to_backlight_device(dev);
 
     mutex_lock(&bd->ops_lock);
     if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) {
         bd->props.state |= BL_CORE_SUSPENDED;
         backlight_update_status(bd);
     }
     mutex_unlock(&bd->ops_lock);
 
     return 0;
 }
 
 static int backlight_resume(struct device *dev)
 {
     struct backlight_device *bd = to_backlight_device(dev);
 
     mutex_lock(&bd->ops_lock);
     if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) {
         bd->props.state &= ~BL_CORE_SUSPENDED;
         backlight_update_status(bd);
     }
     mutex_unlock(&bd->ops_lock);
 
     return 0;
 }
 #endif
 
 static SIMPLE_DEV_PM_OPS(backlight_class_dev_pm_ops, backlight_suspend,
              backlight_resume);
 
 static void bl_device_release(struct device *dev)
 {
     struct backlight_device *bd = to_backlight_device(dev);
     kfree(bd);
 }
 
 static struct attribute *bl_device_attrs[] = {
     &dev_attr_bl_power.attr,
     &dev_attr_brightness.attr,
     &dev_attr_actual_brightness.attr,
     &dev_attr_max_brightness.attr,
     &dev_attr_scale.attr,
     &dev_attr_type.attr,
     NULL,
 };
 ATTRIBUTE_GROUPS(bl_device);
 
 /**
  * backlight_force_update - tell the backlight subsystem that hardware state
  *   has changed
  * @bd: the backlight device to update
  * @reason: reason for update
  *
  * Updates the internal state of the backlight in response to a hardware event,
  * and generates an uevent to notify userspace. A backlight driver shall call
  * backlight_force_update() when the backlight is changed using, for example,
  * a hot-key. The updated brightness is read using get_brightness() and the
  * brightness value is reported using an uevent.
  */
 void backlight_force_update(struct backlight_device *bd,
                 enum backlight_update_reason reason)
 {
     int brightness;
 
     mutex_lock(&bd->ops_lock);
     if (bd->ops && bd->ops->get_brightness) {
         brightness = bd->ops->get_brightness(bd);
         if (brightness >= 0)
             bd->props.brightness = brightness;
         else
             dev_err(&bd->dev,
                 "Could not update brightness from device: %pe\n",
                 ERR_PTR(brightness));
     }
     mutex_unlock(&bd->ops_lock);
     backlight_generate_event(bd, reason);
 }
 EXPORT_SYMBOL(backlight_force_update);
 
 /* deprecated - use devm_backlight_device_register() */
 struct backlight_device *backlight_device_register(const char *name,
     struct device *parent, void *devdata, const struct backlight_ops *ops,
     const struct backlight_properties *props)
 {
     struct backlight_device *new_bd;
     int rc;
 
     pr_debug("backlight_device_register: name=%s\n", name);
 
     new_bd = kzalloc(sizeof(struct backlight_device), GFP_KERNEL);
     if (!new_bd)
         return ERR_PTR(-ENOMEM);
 
     mutex_init(&new_bd->update_lock);
     mutex_init(&new_bd->ops_lock);
 
     new_bd->dev.class = backlight_class;
     new_bd->dev.parent = parent;
     new_bd->dev.release = bl_device_release;
     dev_set_name(&new_bd->dev, "%s", name);
     dev_set_drvdata(&new_bd->dev, devdata);
 
     /* Set default properties */
     if (props) {
         memcpy(&new_bd->props, props,
                sizeof(struct backlight_properties));
         if (props->type <= 0 || props->type >= BACKLIGHT_TYPE_MAX) {
             WARN(1, "%s: invalid backlight type", name);
             new_bd->props.type = BACKLIGHT_RAW;
         }
     } else {
         new_bd->props.type = BACKLIGHT_RAW;
     }
 
     rc = device_register(&new_bd->dev);
     if (rc) {
         put_device(&new_bd->dev);
         return ERR_PTR(rc);
     }
 
     rc = backlight_register_fb(new_bd);
     if (rc) {
         device_unregister(&new_bd->dev);
         return ERR_PTR(rc);
     }
 
     new_bd->ops = ops;
 
 #ifdef CONFIG_PMAC_BACKLIGHT
     mutex_lock(&pmac_backlight_mutex);
     if (!pmac_backlight)
         pmac_backlight = new_bd;
     mutex_unlock(&pmac_backlight_mutex);
 #endif
 
     mutex_lock(&backlight_dev_list_mutex);
     list_add(&new_bd->entry, &backlight_dev_list);
     mutex_unlock(&backlight_dev_list_mutex);
 
     blocking_notifier_call_chain(&backlight_notifier,
                      BACKLIGHT_REGISTERED, new_bd);
 
     return new_bd;
 }
 EXPORT_SYMBOL(backlight_device_register);
 
 /** backlight_device_get_by_type - find first backlight device of a type
  * @type: the type of backlight device
  *
  * Look up the first backlight device of the specified type
  *
  * RETURNS:
  *
  * Pointer to backlight device if any was found. Otherwise NULL.
  */
 struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
 {
     bool found = false;
     struct backlight_device *bd;
 
     mutex_lock(&backlight_dev_list_mutex);
     list_for_each_entry(bd, &backlight_dev_list, entry) {
         if (bd->props.type == type) {
             found = true;
             break;
         }
     }
     mutex_unlock(&backlight_dev_list_mutex);
 
     return found ? bd : NULL;
 }
 EXPORT_SYMBOL(backlight_device_get_by_type);
 
 /**
  * backlight_device_get_by_name - Get backlight device by name
  * @name: Device name
  *
  * This function looks up a backlight device by its name. It obtains a reference
  * on the backlight device and it is the caller's responsibility to drop the
  * reference by calling backlight_put().
  *
  * Returns:
  * A pointer to the backlight device if found, otherwise NULL.
  */
 struct backlight_device *backlight_device_get_by_name(const char *name)
 {
     struct device *dev;
 
     dev = class_find_device_by_name(backlight_class, name);
 
     return dev ? to_backlight_device(dev) : NULL;
 }
 EXPORT_SYMBOL(backlight_device_get_by_name);
 
 /* deprecated - use devm_backlight_device_unregister() */
 void backlight_device_unregister(struct backlight_device *bd)
 {
     if (!bd)
         return;
 
     mutex_lock(&backlight_dev_list_mutex);
     list_del(&bd->entry);
     mutex_unlock(&backlight_dev_list_mutex);
 
 #ifdef CONFIG_PMAC_BACKLIGHT
     mutex_lock(&pmac_backlight_mutex);
     if (pmac_backlight == bd)
         pmac_backlight = NULL;
     mutex_unlock(&pmac_backlight_mutex);
 #endif
 
     blocking_notifier_call_chain(&backlight_notifier,
                      BACKLIGHT_UNREGISTERED, bd);
 
     mutex_lock(&bd->ops_lock);
     bd->ops = NULL;
     mutex_unlock(&bd->ops_lock);
 
     backlight_unregister_fb(bd);
     device_unregister(&bd->dev);
 }
 EXPORT_SYMBOL(backlight_device_unregister);
 
 static void devm_backlight_device_release(struct device *dev, void *res)
 {
     struct backlight_device *backlight = *(struct backlight_device **)res;
 
     backlight_device_unregister(backlight);
 }
 
 static int devm_backlight_device_match(struct device *dev, void *res,
                     void *data)
 {
     struct backlight_device **r = res;
 
     return *r == data;
 }
 
 /**
  * backlight_register_notifier - get notified of backlight (un)registration
  * @nb: notifier block with the notifier to call on backlight (un)registration
  *
  * Register a notifier to get notified when backlight devices get registered
  * or unregistered.
  *
  * RETURNS:
  *
  * 0 on success, otherwise a negative error code
  */
 int backlight_register_notifier(struct notifier_block *nb)
 {
     return blocking_notifier_chain_register(&backlight_notifier, nb);
 }
 EXPORT_SYMBOL(backlight_register_notifier);
 
 /**
  * backlight_unregister_notifier - unregister a backlight notifier
  * @nb: notifier block to unregister
  *
  * Register a notifier to get notified when backlight devices get registered
  * or unregistered.
  *
  * RETURNS:
  *
  * 0 on success, otherwise a negative error code
  */
 int backlight_unregister_notifier(struct notifier_block *nb)
 {
     return blocking_notifier_chain_unregister(&backlight_notifier, nb);
 }
 EXPORT_SYMBOL(backlight_unregister_notifier);
 
 /**
  * devm_backlight_device_register - register a new backlight device
  * @dev: the device to register
  * @name: the name of the device
  * @parent: a pointer to the parent device (often the same as @dev)
  * @devdata: an optional pointer to be stored for private driver use
  * @ops: the backlight operations structure
  * @props: the backlight properties
  *
  * Creates and registers new backlight device. When a backlight device
  * is registered the configuration must be specified in the @props
  * parameter. See description of &backlight_properties.
  *
  * RETURNS:
  *
  * struct backlight on success, or an ERR_PTR on error
  */
 struct backlight_device *devm_backlight_device_register(struct device *dev,
     const char *name, struct device *parent, void *devdata,
     const struct backlight_ops *ops,
     const struct backlight_properties *props)
 {
     struct backlight_device **ptr, *backlight;
 
     ptr = devres_alloc(devm_backlight_device_release, sizeof(*ptr),
             GFP_KERNEL);
     if (!ptr)
         return ERR_PTR(-ENOMEM);
 
     backlight = backlight_device_register(name, parent, devdata, ops,
                         props);
     if (!IS_ERR(backlight)) {
         *ptr = backlight;
         devres_add(dev, ptr);
     } else {
         devres_free(ptr);
     }
 
     return backlight;
 }
 EXPORT_SYMBOL(devm_backlight_device_register);
 
 /**
  * devm_backlight_device_unregister - unregister backlight device
  * @dev: the device to unregister
  * @bd: the backlight device to unregister
  *
  * Deallocates a backlight allocated with devm_backlight_device_register().
  * Normally this function will not need to be called and the resource management
  * code will ensure that the resources are freed.
  */
 void devm_backlight_device_unregister(struct device *dev,
                 struct backlight_device *bd)
 {
     int rc;
 
     rc = devres_release(dev, devm_backlight_device_release,
                 devm_backlight_device_match, bd);
     WARN_ON(rc);
 }
 EXPORT_SYMBOL(devm_backlight_device_unregister);
 
 #ifdef CONFIG_OF
 static int of_parent_match(struct device *dev, const void *data)
 {
     return dev->parent && dev->parent->of_node == data;
 }
 
 /**
  * of_find_backlight_by_node() - find backlight device by device-tree node
  * @node: device-tree node of the backlight device
  *
  * Returns a pointer to the backlight device corresponding to the given DT
  * node or NULL if no such backlight device exists or if the device hasn't
  * been probed yet.
  *
  * This function obtains a reference on the backlight device and it is the
  * caller's responsibility to drop the reference by calling put_device() on
  * the backlight device's .dev field.
  */
 struct backlight_device *of_find_backlight_by_node(struct device_node *node)
 {
     struct device *dev;
 
     dev = class_find_device(backlight_class, NULL, node, of_parent_match);
 
     return dev ? to_backlight_device(dev) : NULL;
 }
 EXPORT_SYMBOL(of_find_backlight_by_node);
 #endif
 
 static struct backlight_device *of_find_backlight(struct device *dev)
 {
     struct backlight_device *bd = NULL;
     struct device_node *np;
 
     if (!dev)
         return NULL;
 
     if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
         np = of_parse_phandle(dev->of_node, "backlight", 0);
         if (np) {
             bd = of_find_backlight_by_node(np);
             of_node_put(np);
             if (!bd)
                 return ERR_PTR(-EPROBE_DEFER);
         }
     }
 
     return bd;
 }
 
 static void devm_backlight_release(void *data)
 {
     struct backlight_device *bd = data;
 
     put_device(&bd->dev);
 }
 
 /**
  * devm_of_find_backlight - find backlight for a device
  * @dev: the device
  *
  * This function looks for a property named 'backlight' on the DT node
  * connected to @dev and looks up the backlight device. The lookup is
  * device managed so the reference to the backlight device is automatically
  * dropped on driver detach.
  *
  * RETURNS:
  *
  * A pointer to the backlight device if found.
  * Error pointer -EPROBE_DEFER if the DT property is set, but no backlight
  * device is found. NULL if there's no backlight property.
  */
 struct backlight_device *devm_of_find_backlight(struct device *dev)
 {
     struct backlight_device *bd;
     int ret;
 
     bd = of_find_backlight(dev);
     if (IS_ERR_OR_NULL(bd))
         return bd;
     ret = devm_add_action_or_reset(dev, devm_backlight_release, bd);
     if (ret)
         return ERR_PTR(ret);
 
     return bd;
 }
 EXPORT_SYMBOL(devm_of_find_backlight);
 
 static void __exit backlight_class_exit(void)
 {
     class_destroy(backlight_class);
 }
 
 static int __init backlight_class_init(void)
 {
     backlight_class = class_create(THIS_MODULE, "backlight");
     if (IS_ERR(backlight_class)) {
         pr_warn("Unable to create backlight class; errno = %ld\n",
             PTR_ERR(backlight_class));
         return PTR_ERR(backlight_class);
     }
 
     backlight_class->dev_groups = bl_device_groups;
     backlight_class->pm = &backlight_class_dev_pm_ops;
     INIT_LIST_HEAD(&backlight_dev_list);
     mutex_init(&backlight_dev_list_mutex);
     BLOCKING_INIT_NOTIFIER_HEAD(&backlight_notifier);
 
     return 0;
 }
 
 /*
  * if this is compiled into the kernel, we need to ensure that the
  * class is registered before users of the class try to register lcd's
  */
 postcore_initcall(backlight_class_init);
 module_exit(backlight_class_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>");
 MODULE_DESCRIPTION("Backlight Lowlevel Control Abstraction");

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