drivers/base/property.c - kernel/lockdown - Git at Google

 /*
  * property.c - Unified device property interface.
  *
  * Copyright (C) 2014, Intel Corporation
  * Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
  *          Mika Westerberg <mika.westerberg@linux.intel.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/acpi.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/of.h>
 #include <linux/property.h>

 /**
  * device_add_property_set - Add a collection of properties to a device object.
  * @dev: Device to add properties to.
  * @pset: Collection of properties to add.
  *
  * Associate a collection of device properties represented by @pset with @dev
  * as its secondary firmware node.
  */
 void device_add_property_set(struct device *dev, struct property_set *pset)
 {
 	if (!pset)
 		return;

 	pset->fwnode.type = FWNODE_PDATA;
 	set_secondary_fwnode(dev, &pset->fwnode);
 }
 EXPORT_SYMBOL_GPL(device_add_property_set);

 static inline bool is_pset(struct fwnode_handle *fwnode)
 {
 	return fwnode && fwnode->type == FWNODE_PDATA;
 }

 static inline struct property_set *to_pset(struct fwnode_handle *fwnode)
 {
 	return is_pset(fwnode) ?
 		container_of(fwnode, struct property_set, fwnode) : NULL;
 }

 static struct property_entry *pset_prop_get(struct property_set *pset,
 					    const char *name)
 {
 	struct property_entry *prop;

 	if (!pset || !pset->properties)
 		return NULL;

 	for (prop = pset->properties; prop->name; prop++)
 		if (!strcmp(name, prop->name))
 			return prop;

 	return NULL;
 }

 static int pset_prop_read_array(struct property_set *pset, const char *name,
 				enum dev_prop_type type, void *val, size_t nval)
 {
 	struct property_entry *prop;
 	unsigned int item_size;

 	prop = pset_prop_get(pset, name);
 	if (!prop)
 		return -ENODATA;

 	if (prop->type != type)
 		return -EPROTO;

 	if (!val)
 		return prop->nval;

 	if (prop->nval < nval)
 		return -EOVERFLOW;

 	switch (type) {
 	case DEV_PROP_U8:
 		item_size = sizeof(u8);
 		break;
 	case DEV_PROP_U16:
 		item_size = sizeof(u16);
 		break;
 	case DEV_PROP_U32:
 		item_size = sizeof(u32);
 		break;
 	case DEV_PROP_U64:
 		item_size = sizeof(u64);
 		break;
 	case DEV_PROP_STRING:
 		item_size = sizeof(const char *);
 		break;
 	default:
 		return -EINVAL;
 	}
 	memcpy(val, prop->value.raw_data, nval * item_size);
 	return 0;
 }

 static inline struct fwnode_handle *dev_fwnode(struct device *dev)
 {
 	return IS_ENABLED(CONFIG_OF) && dev->of_node ?
 		&dev->of_node->fwnode : dev->fwnode;
 }

 /**
  * device_property_present - check if a property of a device is present
  * @dev: Device whose property is being checked
  * @propname: Name of the property
  *
  * Check if property @propname is present in the device firmware description.
  */
 bool device_property_present(struct device *dev, const char *propname)
 {
 	return fwnode_property_present(dev_fwnode(dev), propname);
 }
 EXPORT_SYMBOL_GPL(device_property_present);

 /**
  * fwnode_property_present - check if a property of a firmware node is present
  * @fwnode: Firmware node whose property to check
  * @propname: Name of the property
  */
 bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname)
 {
 	if (is_of_node(fwnode))
 		return of_property_read_bool(of_node(fwnode), propname);
 	else if (is_acpi_node(fwnode))
 		return !acpi_dev_prop_get(acpi_node(fwnode), propname, NULL);

 	return !!pset_prop_get(to_pset(fwnode), propname);
 }
 EXPORT_SYMBOL_GPL(fwnode_property_present);

 /**
  * device_property_read_u8_array - return a u8 array property of a device
  * @dev: Device to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Function reads an array of u8 properties with @propname from the device
  * firmware description and stores them to @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
  */
 int device_property_read_u8_array(struct device *dev, const char *propname,
 				  u8 *val, size_t nval)
 {
 	return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_u8_array);

 /**
  * device_property_read_u16_array - return a u16 array property of a device
  * @dev: Device to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Function reads an array of u16 properties with @propname from the device
  * firmware description and stores them to @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
  */
 int device_property_read_u16_array(struct device *dev, const char *propname,
 				   u16 *val, size_t nval)
 {
 	return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_u16_array);

 /**
  * device_property_read_u32_array - return a u32 array property of a device
  * @dev: Device to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Function reads an array of u32 properties with @propname from the device
  * firmware description and stores them to @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
  */
 int device_property_read_u32_array(struct device *dev, const char *propname,
 				   u32 *val, size_t nval)
 {
 	return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_u32_array);

 /**
  * device_property_read_u64_array - return a u64 array property of a device
  * @dev: Device to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Function reads an array of u64 properties with @propname from the device
  * firmware description and stores them to @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
  */
 int device_property_read_u64_array(struct device *dev, const char *propname,
 				   u64 *val, size_t nval)
 {
 	return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_u64_array);

 /**
  * device_property_read_string_array - return a string array property of device
  * @dev: Device to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Function reads an array of string properties with @propname from the device
  * firmware description and stores them to @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO or %-EILSEQ if the property is not an array of strings,
  *	   %-EOVERFLOW if the size of the property is not as expected.
  */
 int device_property_read_string_array(struct device *dev, const char *propname,
 				      const char **val, size_t nval)
 {
 	return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_string_array);

 /**
  * device_property_read_string - return a string property of a device
  * @dev: Device to get the property of
  * @propname: Name of the property
  * @val: The value is stored here
  *
  * Function reads property @propname from the device firmware description and
  * stores the value into @val if found. The value is checked to be a string.
  *
  * Return: %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO or %-EILSEQ if the property type is not a string.
  */
 int device_property_read_string(struct device *dev, const char *propname,
 				const char **val)
 {
 	return fwnode_property_read_string(dev_fwnode(dev), propname, val);
 }
 EXPORT_SYMBOL_GPL(device_property_read_string);

 #define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \
 	(val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \
 	      : of_property_count_elems_of_size((node), (propname), sizeof(type))

 #define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \
 ({ \
 	int _ret_; \
 	if (is_of_node(_fwnode_)) \
 		_ret_ = OF_DEV_PROP_READ_ARRAY(of_node(_fwnode_), _propname_, \
 					       _type_, _val_, _nval_); \
 	else if (is_acpi_node(_fwnode_)) \
 		_ret_ = acpi_dev_prop_read(acpi_node(_fwnode_), _propname_, \
 					   _proptype_, _val_, _nval_); \
 	else \
 		_ret_ = pset_prop_read_array(to_pset(_fwnode_), _propname_, \
 					     _proptype_, _val_, _nval_); \
 	_ret_; \
 })

 /**
  * fwnode_property_read_u8_array - return a u8 array property of firmware node
  * @fwnode: Firmware node to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Read an array of u8 properties with @propname from @fwnode and stores them to
  * @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected,
  *	   %-ENXIO if no suitable firmware interface is present.
  */
 int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
 				  const char *propname, u8 *val, size_t nval)
 {
 	return FWNODE_PROP_READ_ARRAY(fwnode, propname, u8, DEV_PROP_U8,
 				      val, nval);
 }
 EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array);

 /**
  * fwnode_property_read_u16_array - return a u16 array property of firmware node
  * @fwnode: Firmware node to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Read an array of u16 properties with @propname from @fwnode and store them to
  * @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected,
  *	   %-ENXIO if no suitable firmware interface is present.
  */
 int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
 				   const char *propname, u16 *val, size_t nval)
 {
 	return FWNODE_PROP_READ_ARRAY(fwnode, propname, u16, DEV_PROP_U16,
 				      val, nval);
 }
 EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array);

 /**
  * fwnode_property_read_u32_array - return a u32 array property of firmware node
  * @fwnode: Firmware node to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Read an array of u32 properties with @propname from @fwnode store them to
  * @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected,
  *	   %-ENXIO if no suitable firmware interface is present.
  */
 int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
 				   const char *propname, u32 *val, size_t nval)
 {
 	return FWNODE_PROP_READ_ARRAY(fwnode, propname, u32, DEV_PROP_U32,
 				      val, nval);
 }
 EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array);

 /**
  * fwnode_property_read_u64_array - return a u64 array property firmware node
  * @fwnode: Firmware node to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Read an array of u64 properties with @propname from @fwnode and store them to
  * @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected,
  *	   %-ENXIO if no suitable firmware interface is present.
  */
 int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
 				   const char *propname, u64 *val, size_t nval)
 {
 	return FWNODE_PROP_READ_ARRAY(fwnode, propname, u64, DEV_PROP_U64,
 				      val, nval);
 }
 EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);

 /**
  * fwnode_property_read_string_array - return string array property of a node
  * @fwnode: Firmware node to get the property of
  * @propname: Name of the property
  * @val: The values are stored here or %NULL to return the number of values
  * @nval: Size of the @val array
  *
  * Read an string list property @propname from the given firmware node and store
  * them to @val if found.
  *
  * Return: number of values if @val was %NULL,
  *         %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of strings,
  *	   %-EOVERFLOW if the size of the property is not as expected,
  *	   %-ENXIO if no suitable firmware interface is present.
  */
 int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
 				      const char *propname, const char **val,
 				      size_t nval)
 {
 	if (is_of_node(fwnode))
 		return val ?
 			of_property_read_string_array(of_node(fwnode), propname,
 						      val, nval) :
 			of_property_count_strings(of_node(fwnode), propname);
 	else if (is_acpi_node(fwnode))
 		return acpi_dev_prop_read(acpi_node(fwnode), propname,
 					  DEV_PROP_STRING, val, nval);

 	return pset_prop_read_array(to_pset(fwnode), propname,
 				    DEV_PROP_STRING, val, nval);
 }
 EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);

 /**
  * fwnode_property_read_string - return a string property of a firmware node
  * @fwnode: Firmware node to get the property of
  * @propname: Name of the property
  * @val: The value is stored here
  *
  * Read property @propname from the given firmware node and store the value into
  * @val if found.  The value is checked to be a string.
  *
  * Return: %0 if the property was found (success),
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO or %-EILSEQ if the property is not a string,
  *	   %-ENXIO if no suitable firmware interface is present.
  */
 int fwnode_property_read_string(struct fwnode_handle *fwnode,
 				const char *propname, const char **val)
 {
 	if (is_of_node(fwnode))
 		return of_property_read_string(of_node(fwnode), propname, val);
 	else if (is_acpi_node(fwnode))
 		return acpi_dev_prop_read(acpi_node(fwnode), propname,
 					  DEV_PROP_STRING, val, 1);

 	return -ENXIO;
 }
 EXPORT_SYMBOL_GPL(fwnode_property_read_string);

 /**
  * device_get_next_child_node - Return the next child node handle for a device
  * @dev: Device to find the next child node for.
  * @child: Handle to one of the device's child nodes or a null handle.
  */
 struct fwnode_handle *device_get_next_child_node(struct device *dev,
 						 struct fwnode_handle *child)
 {
 	if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
 		struct device_node *node;

 		node = of_get_next_available_child(dev->of_node, of_node(child));
 		if (node)
 			return &node->fwnode;
 	} else if (IS_ENABLED(CONFIG_ACPI)) {
 		struct acpi_device *node;

 		node = acpi_get_next_child(dev, acpi_node(child));
 		if (node)
 			return acpi_fwnode_handle(node);
 	}
 	return NULL;
 }
 EXPORT_SYMBOL_GPL(device_get_next_child_node);

 /**
  * fwnode_handle_put - Drop reference to a device node
  * @fwnode: Pointer to the device node to drop the reference to.
  *
  * This has to be used when terminating device_for_each_child_node() iteration
  * with break or return to prevent stale device node references from being left
  * behind.
  */
 void fwnode_handle_put(struct fwnode_handle *fwnode)
 {
 	if (is_of_node(fwnode))
 		of_node_put(of_node(fwnode));
 }
 EXPORT_SYMBOL_GPL(fwnode_handle_put);

 /**
  * device_get_child_node_count - return the number of child nodes for device
  * @dev: Device to cound the child nodes for
  */
 unsigned int device_get_child_node_count(struct device *dev)
 {
 	struct fwnode_handle *child;
 	unsigned int count = 0;

 	device_for_each_child_node(dev, child)
 		count++;

 	return count;
 }
 EXPORT_SYMBOL_GPL(device_get_child_node_count);
	/*
	* property.c - Unified device property interface.
	*
	* Copyright (C) 2014, Intel Corporation
	* Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
	* Mika Westerberg <mika.westerberg@linux.intel.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/acpi.h>
	#include <linux/export.h>
	#include <linux/kernel.h>
	#include <linux/of.h>
	#include <linux/property.h>

	/**
	* device_add_property_set - Add a collection of properties to a device object.
	* @dev: Device to add properties to.
	* @pset: Collection of properties to add.
	*
	* Associate a collection of device properties represented by @pset with @dev
	* as its secondary firmware node.
	*/
	void device_add_property_set(struct device dev, struct property_set pset)
	{
	if (!pset)
	return;

	pset->fwnode.type = FWNODE_PDATA;
	set_secondary_fwnode(dev, &pset->fwnode);
	}
	EXPORT_SYMBOL_GPL(device_add_property_set);

	static inline bool is_pset(struct fwnode_handle *fwnode)
	{
	return fwnode && fwnode->type == FWNODE_PDATA;
	}

	static inline struct property_set to_pset(struct fwnode_handle fwnode)
	{
	return is_pset(fwnode) ?
	container_of(fwnode, struct property_set, fwnode) : NULL;
	}

	static struct property_entry pset_prop_get(struct property_set pset,
	const char *name)
	{
	struct property_entry *prop;

	if (!pset \|\| !pset->properties)
	return NULL;

	for (prop = pset->properties; prop->name; prop++)
	if (!strcmp(name, prop->name))
	return prop;

	return NULL;
	}

	static int pset_prop_read_array(struct property_set pset, const char name,
	enum dev_prop_type type, void *val, size_t nval)
	{
	struct property_entry *prop;
	unsigned int item_size;

	prop = pset_prop_get(pset, name);
	if (!prop)
	return -ENODATA;

	if (prop->type != type)
	return -EPROTO;

	if (!val)
	return prop->nval;

	if (prop->nval < nval)
	return -EOVERFLOW;

	switch (type) {
	case DEV_PROP_U8:
	item_size = sizeof(u8);
	break;
	case DEV_PROP_U16:
	item_size = sizeof(u16);
	break;
	case DEV_PROP_U32:
	item_size = sizeof(u32);
	break;
	case DEV_PROP_U64:
	item_size = sizeof(u64);
	break;
	case DEV_PROP_STRING:
	item_size = sizeof(const char *);
	break;
	default:
	return -EINVAL;
	}
	memcpy(val, prop->value.raw_data, nval * item_size);
	return 0;
	}

	static inline struct fwnode_handle dev_fwnode(struct device dev)
	{
	return IS_ENABLED(CONFIG_OF) && dev->of_node ?
	&dev->of_node->fwnode : dev->fwnode;
	}

	/**
	* device_property_present - check if a property of a device is present
	* @dev: Device whose property is being checked
	* @propname: Name of the property
	*
	* Check if property @propname is present in the device firmware description.
	*/
	bool device_property_present(struct device dev, const char propname)
	{
	return fwnode_property_present(dev_fwnode(dev), propname);
	}
	EXPORT_SYMBOL_GPL(device_property_present);

	/**
	* fwnode_property_present - check if a property of a firmware node is present
	* @fwnode: Firmware node whose property to check
	* @propname: Name of the property
	*/
	bool fwnode_property_present(struct fwnode_handle fwnode, const char propname)
	{
	if (is_of_node(fwnode))
	return of_property_read_bool(of_node(fwnode), propname);
	else if (is_acpi_node(fwnode))
	return !acpi_dev_prop_get(acpi_node(fwnode), propname, NULL);

	return !!pset_prop_get(to_pset(fwnode), propname);
	}
	EXPORT_SYMBOL_GPL(fwnode_property_present);

	/**
	* device_property_read_u8_array - return a u8 array property of a device
	* @dev: Device to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Function reads an array of u8 properties with @propname from the device
	* firmware description and stores them to @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of numbers,
	* %-EOVERFLOW if the size of the property is not as expected.
	*/
	int device_property_read_u8_array(struct device dev, const char propname,
	u8 *val, size_t nval)
	{
	return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval);
	}
	EXPORT_SYMBOL_GPL(device_property_read_u8_array);

	/**
	* device_property_read_u16_array - return a u16 array property of a device
	* @dev: Device to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Function reads an array of u16 properties with @propname from the device
	* firmware description and stores them to @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of numbers,
	* %-EOVERFLOW if the size of the property is not as expected.
	*/
	int device_property_read_u16_array(struct device dev, const char propname,
	u16 *val, size_t nval)
	{
	return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval);
	}
	EXPORT_SYMBOL_GPL(device_property_read_u16_array);

	/**
	* device_property_read_u32_array - return a u32 array property of a device
	* @dev: Device to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Function reads an array of u32 properties with @propname from the device
	* firmware description and stores them to @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of numbers,
	* %-EOVERFLOW if the size of the property is not as expected.
	*/
	int device_property_read_u32_array(struct device dev, const char propname,
	u32 *val, size_t nval)
	{
	return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval);
	}
	EXPORT_SYMBOL_GPL(device_property_read_u32_array);

	/**
	* device_property_read_u64_array - return a u64 array property of a device
	* @dev: Device to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Function reads an array of u64 properties with @propname from the device
	* firmware description and stores them to @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of numbers,
	* %-EOVERFLOW if the size of the property is not as expected.
	*/
	int device_property_read_u64_array(struct device dev, const char propname,
	u64 *val, size_t nval)
	{
	return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval);
	}
	EXPORT_SYMBOL_GPL(device_property_read_u64_array);

	/**
	* device_property_read_string_array - return a string array property of device
	* @dev: Device to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Function reads an array of string properties with @propname from the device
	* firmware description and stores them to @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO or %-EILSEQ if the property is not an array of strings,
	* %-EOVERFLOW if the size of the property is not as expected.
	*/
	int device_property_read_string_array(struct device dev, const char propname,
	const char **val, size_t nval)
	{
	return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval);
	}
	EXPORT_SYMBOL_GPL(device_property_read_string_array);

	/**
	* device_property_read_string - return a string property of a device
	* @dev: Device to get the property of
	* @propname: Name of the property
	* @val: The value is stored here
	*
	* Function reads property @propname from the device firmware description and
	* stores the value into @val if found. The value is checked to be a string.
	*
	* Return: %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO or %-EILSEQ if the property type is not a string.
	*/
	int device_property_read_string(struct device dev, const char propname,
	const char **val)
	{
	return fwnode_property_read_string(dev_fwnode(dev), propname, val);
	}
	EXPORT_SYMBOL_GPL(device_property_read_string);

	#define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \
	(val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \
	: of_property_count_elems_of_size((node), (propname), sizeof(type))

	#define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \
	({ \
	int _ret_; \
	if (is_of_node(_fwnode_)) \
	_ret_ = OF_DEV_PROP_READ_ARRAY(of_node(_fwnode_), _propname_, \
	_type_, _val_, _nval_); \
	else if (is_acpi_node(_fwnode_)) \
	_ret_ = acpi_dev_prop_read(acpi_node(_fwnode_), _propname_, \
	_proptype_, _val_, _nval_); \
	else \
	_ret_ = pset_prop_read_array(to_pset(_fwnode_), _propname_, \
	_proptype_, _val_, _nval_); \
	_ret_; \
	})

	/**
	* fwnode_property_read_u8_array - return a u8 array property of firmware node
	* @fwnode: Firmware node to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Read an array of u8 properties with @propname from @fwnode and stores them to
	* @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of numbers,
	* %-EOVERFLOW if the size of the property is not as expected,
	* %-ENXIO if no suitable firmware interface is present.
	*/
	int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
	const char propname, u8 val, size_t nval)
	{
	return FWNODE_PROP_READ_ARRAY(fwnode, propname, u8, DEV_PROP_U8,
	val, nval);
	}
	EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array);

	/**
	* fwnode_property_read_u16_array - return a u16 array property of firmware node
	* @fwnode: Firmware node to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Read an array of u16 properties with @propname from @fwnode and store them to
	* @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of numbers,
	* %-EOVERFLOW if the size of the property is not as expected,
	* %-ENXIO if no suitable firmware interface is present.
	*/
	int fwnode_property_read_u16_array(struct fwnode_handle *fwnode,
	const char propname, u16 val, size_t nval)
	{
	return FWNODE_PROP_READ_ARRAY(fwnode, propname, u16, DEV_PROP_U16,
	val, nval);
	}
	EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array);

	/**
	* fwnode_property_read_u32_array - return a u32 array property of firmware node
	* @fwnode: Firmware node to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Read an array of u32 properties with @propname from @fwnode store them to
	* @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of numbers,
	* %-EOVERFLOW if the size of the property is not as expected,
	* %-ENXIO if no suitable firmware interface is present.
	*/
	int fwnode_property_read_u32_array(struct fwnode_handle *fwnode,
	const char propname, u32 val, size_t nval)
	{
	return FWNODE_PROP_READ_ARRAY(fwnode, propname, u32, DEV_PROP_U32,
	val, nval);
	}
	EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array);

	/**
	* fwnode_property_read_u64_array - return a u64 array property firmware node
	* @fwnode: Firmware node to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Read an array of u64 properties with @propname from @fwnode and store them to
	* @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of numbers,
	* %-EOVERFLOW if the size of the property is not as expected,
	* %-ENXIO if no suitable firmware interface is present.
	*/
	int fwnode_property_read_u64_array(struct fwnode_handle *fwnode,
	const char propname, u64 val, size_t nval)
	{
	return FWNODE_PROP_READ_ARRAY(fwnode, propname, u64, DEV_PROP_U64,
	val, nval);
	}
	EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);

	/**
	* fwnode_property_read_string_array - return string array property of a node
	* @fwnode: Firmware node to get the property of
	* @propname: Name of the property
	* @val: The values are stored here or %NULL to return the number of values
	* @nval: Size of the @val array
	*
	* Read an string list property @propname from the given firmware node and store
	* them to @val if found.
	*
	* Return: number of values if @val was %NULL,
	* %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO if the property is not an array of strings,
	* %-EOVERFLOW if the size of the property is not as expected,
	* %-ENXIO if no suitable firmware interface is present.
	*/
	int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
	const char propname, const char *val,
	size_t nval)
	{
	if (is_of_node(fwnode))
	return val ?
	of_property_read_string_array(of_node(fwnode), propname,
	val, nval) :
	of_property_count_strings(of_node(fwnode), propname);
	else if (is_acpi_node(fwnode))
	return acpi_dev_prop_read(acpi_node(fwnode), propname,
	DEV_PROP_STRING, val, nval);

	return pset_prop_read_array(to_pset(fwnode), propname,
	DEV_PROP_STRING, val, nval);
	}
	EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);

	/**
	* fwnode_property_read_string - return a string property of a firmware node
	* @fwnode: Firmware node to get the property of
	* @propname: Name of the property
	* @val: The value is stored here
	*
	* Read property @propname from the given firmware node and store the value into
	* @val if found. The value is checked to be a string.
	*
	* Return: %0 if the property was found (success),
	* %-EINVAL if given arguments are not valid,
	* %-ENODATA if the property does not have a value,
	* %-EPROTO or %-EILSEQ if the property is not a string,
	* %-ENXIO if no suitable firmware interface is present.
	*/
	int fwnode_property_read_string(struct fwnode_handle *fwnode,
	const char propname, const char *val)
	{
	if (is_of_node(fwnode))
	return of_property_read_string(of_node(fwnode), propname, val);
	else if (is_acpi_node(fwnode))
	return acpi_dev_prop_read(acpi_node(fwnode), propname,
	DEV_PROP_STRING, val, 1);

	return -ENXIO;
	}
	EXPORT_SYMBOL_GPL(fwnode_property_read_string);

	/**
	* device_get_next_child_node - Return the next child node handle for a device
	* @dev: Device to find the next child node for.
	* @child: Handle to one of the device's child nodes or a null handle.
	*/
	struct fwnode_handle device_get_next_child_node(struct device dev,
	struct fwnode_handle *child)
	{
	if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
	struct device_node *node;

	node = of_get_next_available_child(dev->of_node, of_node(child));
	if (node)
	return &node->fwnode;
	} else if (IS_ENABLED(CONFIG_ACPI)) {
	struct acpi_device *node;

	node = acpi_get_next_child(dev, acpi_node(child));
	if (node)
	return acpi_fwnode_handle(node);
	}
	return NULL;
	}
	EXPORT_SYMBOL_GPL(device_get_next_child_node);

	/**
	* fwnode_handle_put - Drop reference to a device node
	* @fwnode: Pointer to the device node to drop the reference to.
	*
	* This has to be used when terminating device_for_each_child_node() iteration
	* with break or return to prevent stale device node references from being left
	* behind.
	*/
	void fwnode_handle_put(struct fwnode_handle *fwnode)
	{
	if (is_of_node(fwnode))
	of_node_put(of_node(fwnode));
	}
	EXPORT_SYMBOL_GPL(fwnode_handle_put);

	/**
	* device_get_child_node_count - return the number of child nodes for device
	* @dev: Device to cound the child nodes for
	*/
	unsigned int device_get_child_node_count(struct device *dev)
	{
	struct fwnode_handle *child;
	unsigned int count = 0;

	device_for_each_child_node(dev, child)
	count++;

	return count;
	}
	EXPORT_SYMBOL_GPL(device_get_child_node_count);