Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1333 insertions, 0 deletions

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
new file mode 100644
index 000000000..c8018d73d
--- /dev/null
+++ b/drivers/acpi/property.c
@@ -0,0 +1,1333 @@
+/*
+ * ACPI device specific properties support.
+ *
+ * Copyright (C) 2014, Intel Corporation
+ * All rights reserved.
+ *
+ * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
+ *          Darren Hart <dvhart@linux.intel.com>
+ *          Rafael J. Wysocki <rafael.j.wysocki@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/device.h>
+#include <linux/export.h>
+
+#include "internal.h"
+
+static int acpi_data_get_property_array(const struct acpi_device_data *data,
+					const char *name,
+					acpi_object_type type,
+					const union acpi_object **obj);
+
+/* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
+static const guid_t prp_guid =
+	GUID_INIT(0xdaffd814, 0x6eba, 0x4d8c,
+		  0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01);
+/* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
+static const guid_t ads_guid =
+	GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
+		  0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b);
+
+static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
+					   const union acpi_object *desc,
+					   struct acpi_device_data *data,
+					   struct fwnode_handle *parent);
+static bool acpi_extract_properties(const union acpi_object *desc,
+				    struct acpi_device_data *data);
+
+static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
+					acpi_handle handle,
+					const union acpi_object *link,
+					struct list_head *list,
+					struct fwnode_handle *parent)
+{
+	struct acpi_data_node *dn;
+	bool result;
+
+	dn = kzalloc(sizeof(*dn), GFP_KERNEL);
+	if (!dn)
+		return false;
+
+	dn->name = link->package.elements[0].string.pointer;
+	dn->fwnode.ops = &acpi_data_fwnode_ops;
+	dn->parent = parent;
+	INIT_LIST_HEAD(&dn->data.subnodes);
+
+	result = acpi_extract_properties(desc, &dn->data);
+
+	if (handle) {
+		acpi_handle scope;
+		acpi_status status;
+
+		/*
+		 * The scope for the subnode object lookup is the one of the
+		 * namespace node (device) containing the object that has
+		 * returned the package.  That is, it's the scope of that
+		 * object's parent.
+		 */
+		status = acpi_get_parent(handle, &scope);
+		if (ACPI_SUCCESS(status)
+		    && acpi_enumerate_nondev_subnodes(scope, desc, &dn->data,
+						      &dn->fwnode))
+			result = true;
+	} else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data,
+						  &dn->fwnode)) {
+		result = true;
+	}
+
+	if (result) {
+		dn->handle = handle;
+		dn->data.pointer = desc;
+		list_add_tail(&dn->sibling, list);
+		return true;
+	}
+
+	kfree(dn);
+	acpi_handle_debug(handle, "Invalid properties/subnodes data, skipping\n");
+	return false;
+}
+
+static bool acpi_nondev_subnode_data_ok(acpi_handle handle,
+					const union acpi_object *link,
+					struct list_head *list,
+					struct fwnode_handle *parent)
+{
+	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+	acpi_status status;
+
+	status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf,
+					    ACPI_TYPE_PACKAGE);
+	if (ACPI_FAILURE(status))
+		return false;
+
+	if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list,
+					parent))
+		return true;
+
+	ACPI_FREE(buf.pointer);
+	return false;
+}
+
+static bool acpi_nondev_subnode_ok(acpi_handle scope,
+				   const union acpi_object *link,
+				   struct list_head *list,
+				   struct fwnode_handle *parent)
+{
+	acpi_handle handle;
+	acpi_status status;
+
+	if (!scope)
+		return false;
+
+	status = acpi_get_handle(scope, link->package.elements[1].string.pointer,
+				 &handle);
+	if (ACPI_FAILURE(status))
+		return false;
+
+	return acpi_nondev_subnode_data_ok(handle, link, list, parent);
+}
+
+static int acpi_add_nondev_subnodes(acpi_handle scope,
+				    const union acpi_object *links,
+				    struct list_head *list,
+				    struct fwnode_handle *parent)
+{
+	bool ret = false;
+	int i;
+
+	for (i = 0; i < links->package.count; i++) {
+		const union acpi_object *link, *desc;
+		acpi_handle handle;
+		bool result;
+
+		link = &links->package.elements[i];
+		/* Only two elements allowed. */
+		if (link->package.count != 2)
+			continue;
+
+		/* The first one must be a string. */
+		if (link->package.elements[0].type != ACPI_TYPE_STRING)
+			continue;
+
+		/* The second one may be a string, a reference or a package. */
+		switch (link->package.elements[1].type) {
+		case ACPI_TYPE_STRING:
+			result = acpi_nondev_subnode_ok(scope, link, list,
+							 parent);
+			break;
+		case ACPI_TYPE_LOCAL_REFERENCE:
+			handle = link->package.elements[1].reference.handle;
+			result = acpi_nondev_subnode_data_ok(handle, link, list,
+							     parent);
+			break;
+		case ACPI_TYPE_PACKAGE:
+			desc = &link->package.elements[1];
+			result = acpi_nondev_subnode_extract(desc, NULL, link,
+							     list, parent);
+			break;
+		default:
+			result = false;
+			break;
+		}
+		ret = ret || result;
+	}
+
+	return ret;
+}
+
+static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
+					   const union acpi_object *desc,
+					   struct acpi_device_data *data,
+					   struct fwnode_handle *parent)
+{
+	int i;
+
+	/* Look for the ACPI data subnodes GUID. */
+	for (i = 0; i < desc->package.count; i += 2) {
+		const union acpi_object *guid, *links;
+
+		guid = &desc->package.elements[i];
+		links = &desc->package.elements[i + 1];
+
+		/*
+		 * The first element must be a GUID and the second one must be
+		 * a package.
+		 */
+		if (guid->type != ACPI_TYPE_BUFFER ||
+		    guid->buffer.length != 16 ||
+		    links->type != ACPI_TYPE_PACKAGE)
+			break;
+
+		if (!guid_equal((guid_t *)guid->buffer.pointer, &ads_guid))
+			continue;
+
+		return acpi_add_nondev_subnodes(scope, links, &data->subnodes,
+						parent);
+	}
+
+	return false;
+}
+
+static bool acpi_property_value_ok(const union acpi_object *value)
+{
+	int j;
+
+	/*
+	 * The value must be an integer, a string, a reference, or a package
+	 * whose every element must be an integer, a string, or a reference.
+	 */
+	switch (value->type) {
+	case ACPI_TYPE_INTEGER:
+	case ACPI_TYPE_STRING:
+	case ACPI_TYPE_LOCAL_REFERENCE:
+		return true;
+
+	case ACPI_TYPE_PACKAGE:
+		for (j = 0; j < value->package.count; j++)
+			switch (value->package.elements[j].type) {
+			case ACPI_TYPE_INTEGER:
+			case ACPI_TYPE_STRING:
+			case ACPI_TYPE_LOCAL_REFERENCE:
+				continue;
+
+			default:
+				return false;
+			}
+
+		return true;
+	}
+	return false;
+}
+
+static bool acpi_properties_format_valid(const union acpi_object *properties)
+{
+	int i;
+
+	for (i = 0; i < properties->package.count; i++) {
+		const union acpi_object *property;
+
+		property = &properties->package.elements[i];
+		/*
+		 * Only two elements allowed, the first one must be a string and
+		 * the second one has to satisfy certain conditions.
+		 */
+		if (property->package.count != 2
+		    || property->package.elements[0].type != ACPI_TYPE_STRING
+		    || !acpi_property_value_ok(&property->package.elements[1]))
+			return false;
+	}
+	return true;
+}
+
+static void acpi_init_of_compatible(struct acpi_device *adev)
+{
+	const union acpi_object *of_compatible;
+	int ret;
+
+	ret = acpi_data_get_property_array(&adev->data, "compatible",
+					   ACPI_TYPE_STRING, &of_compatible);
+	if (ret) {
+		ret = acpi_dev_get_property(adev, "compatible",
+					    ACPI_TYPE_STRING, &of_compatible);
+		if (ret) {
+			if (adev->parent
+			    && adev->parent->flags.of_compatible_ok)
+				goto out;
+
+			return;
+		}
+	}
+	adev->data.of_compatible = of_compatible;
+
+ out:
+	adev->flags.of_compatible_ok = 1;
+}
+
+static bool acpi_extract_properties(const union acpi_object *desc,
+				    struct acpi_device_data *data)
+{
+	int i;
+
+	if (desc->package.count % 2)
+		return false;
+
+	/* Look for the device properties GUID. */
+	for (i = 0; i < desc->package.count; i += 2) {
+		const union acpi_object *guid, *properties;
+
+		guid = &desc->package.elements[i];
+		properties = &desc->package.elements[i + 1];
+
+		/*
+		 * The first element must be a GUID and the second one must be
+		 * a package.
+		 */
+		if (guid->type != ACPI_TYPE_BUFFER ||
+		    guid->buffer.length != 16 ||
+		    properties->type != ACPI_TYPE_PACKAGE)
+			break;
+
+		if (!guid_equal((guid_t *)guid->buffer.pointer, &prp_guid))
+			continue;
+
+		/*
+		 * We found the matching GUID. Now validate the format of the
+		 * package immediately following it.
+		 */
+		if (!acpi_properties_format_valid(properties))
+			break;
+
+		data->properties = properties;
+		return true;
+	}
+
+	return false;
+}
+
+void acpi_init_properties(struct acpi_device *adev)
+{
+	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+	struct acpi_hardware_id *hwid;
+	acpi_status status;
+	bool acpi_of = false;
+
+	INIT_LIST_HEAD(&adev->data.subnodes);
+
+	if (!adev->handle)
+		return;
+
+	/*
+	 * Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
+	 * Device Tree compatible properties for this device.
+	 */
+	list_for_each_entry(hwid, &adev->pnp.ids, list) {
+		if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) {
+			acpi_of = true;
+			break;
+		}
+	}
+
+	status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf,
+					    ACPI_TYPE_PACKAGE);
+	if (ACPI_FAILURE(status))
+		goto out;
+
+	if (acpi_extract_properties(buf.pointer, &adev->data)) {
+		adev->data.pointer = buf.pointer;
+		if (acpi_of)
+			acpi_init_of_compatible(adev);
+	}
+	if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer,
+					&adev->data, acpi_fwnode_handle(adev)))
+		adev->data.pointer = buf.pointer;
+
+	if (!adev->data.pointer) {
+		acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
+		ACPI_FREE(buf.pointer);
+	}
+
+ out:
+	if (acpi_of && !adev->flags.of_compatible_ok)
+		acpi_handle_info(adev->handle,
+			 ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n");
+
+	if (!adev->data.pointer)
+		acpi_extract_apple_properties(adev);
+}
+
+static void acpi_destroy_nondev_subnodes(struct list_head *list)
+{
+	struct acpi_data_node *dn, *next;
+
+	if (list_empty(list))
+		return;
+
+	list_for_each_entry_safe_reverse(dn, next, list, sibling) {
+		acpi_destroy_nondev_subnodes(&dn->data.subnodes);
+		wait_for_completion(&dn->kobj_done);
+		list_del(&dn->sibling);
+		ACPI_FREE((void *)dn->data.pointer);
+		kfree(dn);
+	}
+}
+
+void acpi_free_properties(struct acpi_device *adev)
+{
+	acpi_destroy_nondev_subnodes(&adev->data.subnodes);
+	ACPI_FREE((void *)adev->data.pointer);
+	adev->data.of_compatible = NULL;
+	adev->data.pointer = NULL;
+	adev->data.properties = NULL;
+}
+
+/**
+ * acpi_data_get_property - return an ACPI property with given name
+ * @data: ACPI device deta object to get the property from
+ * @name: Name of the property
+ * @type: Expected property type
+ * @obj: Location to store the property value (if not %NULL)
+ *
+ * Look up a property with @name and store a pointer to the resulting ACPI
+ * object at the location pointed to by @obj if found.
+ *
+ * Callers must not attempt to free the returned objects.  These objects will be
+ * freed by the ACPI core automatically during the removal of @data.
+ *
+ * Return: %0 if property with @name has been found (success),
+ *         %-EINVAL if the arguments are invalid,
+ *         %-EINVAL if the property doesn't exist,
+ *         %-EPROTO if the property value type doesn't match @type.
+ */
+static int acpi_data_get_property(const struct acpi_device_data *data,
+				  const char *name, acpi_object_type type,
+				  const union acpi_object **obj)
+{
+	const union acpi_object *properties;
+	int i;
+
+	if (!data || !name)
+		return -EINVAL;
+
+	if (!data->pointer || !data->properties)
+		return -EINVAL;
+
+	properties = data->properties;
+	for (i = 0; i < properties->package.count; i++) {
+		const union acpi_object *propname, *propvalue;
+		const union acpi_object *property;
+
+		property = &properties->package.elements[i];
+
+		propname = &property->package.elements[0];
+		propvalue = &property->package.elements[1];
+
+		if (!strcmp(name, propname->string.pointer)) {
+			if (type != ACPI_TYPE_ANY && propvalue->type != type)
+				return -EPROTO;
+			if (obj)
+				*obj = propvalue;
+
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+/**
+ * acpi_dev_get_property - return an ACPI property with given name.
+ * @adev: ACPI device to get the property from.
+ * @name: Name of the property.
+ * @type: Expected property type.
+ * @obj: Location to store the property value (if not %NULL).
+ */
+int acpi_dev_get_property(const struct acpi_device *adev, const char *name,
+			  acpi_object_type type, const union acpi_object **obj)
+{
+	return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_get_property);
+
+static const struct acpi_device_data *
+acpi_device_data_of_node(const struct fwnode_handle *fwnode)
+{
+	if (is_acpi_device_node(fwnode)) {
+		const struct acpi_device *adev = to_acpi_device_node(fwnode);
+		return &adev->data;
+	} else if (is_acpi_data_node(fwnode)) {
+		const struct acpi_data_node *dn = to_acpi_data_node(fwnode);
+		return &dn->data;
+	}
+	return NULL;
+}
+
+/**
+ * acpi_node_prop_get - return an ACPI property with given name.
+ * @fwnode: Firmware node to get the property from.
+ * @propname: Name of the property.
+ * @valptr: Location to store a pointer to the property value (if not %NULL).
+ */
+int acpi_node_prop_get(const struct fwnode_handle *fwnode,
+		       const char *propname, void **valptr)
+{
+	return acpi_data_get_property(acpi_device_data_of_node(fwnode),
+				      propname, ACPI_TYPE_ANY,
+				      (const union acpi_object **)valptr);
+}
+
+/**
+ * acpi_data_get_property_array - return an ACPI array property with given name
+ * @adev: ACPI data object to get the property from
+ * @name: Name of the property
+ * @type: Expected type of array elements
+ * @obj: Location to store a pointer to the property value (if not NULL)
+ *
+ * Look up an array property with @name and store a pointer to the resulting
+ * ACPI object at the location pointed to by @obj if found.
+ *
+ * Callers must not attempt to free the returned objects.  Those objects will be
+ * freed by the ACPI core automatically during the removal of @data.
+ *
+ * Return: %0 if array property (package) with @name has been found (success),
+ *         %-EINVAL if the arguments are invalid,
+ *         %-EINVAL if the property doesn't exist,
+ *         %-EPROTO if the property is not a package or the type of its elements
+ *           doesn't match @type.
+ */
+static int acpi_data_get_property_array(const struct acpi_device_data *data,
+					const char *name,
+					acpi_object_type type,
+					const union acpi_object **obj)
+{
+	const union acpi_object *prop;
+	int ret, i;
+
+	ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop);
+	if (ret)
+		return ret;
+
+	if (type != ACPI_TYPE_ANY) {
+		/* Check that all elements are of correct type. */
+		for (i = 0; i < prop->package.count; i++)
+			if (prop->package.elements[i].type != type)
+				return -EPROTO;
+	}
+	if (obj)
+		*obj = prop;
+
+	return 0;
+}
+
+static struct fwnode_handle *
+acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
+				 const char *childname)
+{
+	struct fwnode_handle *child;
+
+	/*
+	 * Find first matching named child node of this fwnode.
+	 * For ACPI this will be a data only sub-node.
+	 */
+	fwnode_for_each_child_node(fwnode, child)
+		if (acpi_data_node_match(child, childname))
+			return child;
+
+	return NULL;
+}
+
+/**
+ * __acpi_node_get_property_reference - returns handle to the referenced object
+ * @fwnode: Firmware node to get the property from
+ * @propname: Name of the property
+ * @index: Index of the reference to return
+ * @num_args: Maximum number of arguments after each reference
+ * @args: Location to store the returned reference with optional arguments
+ *
+ * Find property with @name, verifify that it is a package containing at least
+ * one object reference and if so, store the ACPI device object pointer to the
+ * target object in @args->adev.  If the reference includes arguments, store
+ * them in the @args->args[] array.
+ *
+ * If there's more than one reference in the property value package, @index is
+ * used to select the one to return.
+ *
+ * It is possible to leave holes in the property value set like in the
+ * example below:
+ *
+ * Package () {
+ *     "cs-gpios",
+ *     Package () {
+ *        ^GPIO, 19, 0, 0,
+ *        ^GPIO, 20, 0, 0,
+ *        0,
+ *        ^GPIO, 21, 0, 0,
+ *     }
+ * }
+ *
+ * Calling this function with index %2 or index %3 return %-ENOENT. If the
+ * property does not contain any more values %-ENOENT is returned. The NULL
+ * entry must be single integer and preferably contain value %0.
+ *
+ * Return: %0 on success, negative error code on failure.
+ */
+int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
+	const char *propname, size_t index, size_t num_args,
+	struct fwnode_reference_args *args)
+{
+	const union acpi_object *element, *end;
+	const union acpi_object *obj;
+	const struct acpi_device_data *data;
+	struct acpi_device *device;
+	int ret, idx = 0;
+
+	data = acpi_device_data_of_node(fwnode);
+	if (!data)
+		return -ENOENT;
+
+	ret = acpi_data_get_property(data, propname, ACPI_TYPE_ANY, &obj);
+	if (ret)
+		return ret == -EINVAL ? -ENOENT : -EINVAL;
+
+	/*
+	 * The simplest case is when the value is a single reference.  Just
+	 * return that reference then.
+	 */
+	if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) {
+		if (index)
+			return -ENOENT;
+
+		ret = acpi_bus_get_device(obj->reference.handle, &device);
+		if (ret)
+			return ret == -ENODEV ? -EINVAL : ret;
+
+		args->fwnode = acpi_fwnode_handle(device);
+		args->nargs = 0;
+		return 0;
+	}
+
+	/*
+	 * If it is not a single reference, then it is a package of
+	 * references followed by number of ints as follows:
+	 *
+	 *  Package () { REF, INT, REF, INT, INT }
+	 *
+	 * The index argument is then used to determine which reference
+	 * the caller wants (along with the arguments).
+	 */
+	if (obj->type != ACPI_TYPE_PACKAGE)
+		return -EINVAL;
+	if (index >= obj->package.count)
+		return -ENOENT;
+
+	element = obj->package.elements;
+	end = element + obj->package.count;
+
+	while (element < end) {
+		u32 nargs, i;
+
+		if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
+			struct fwnode_handle *ref_fwnode;
+
+			ret = acpi_bus_get_device(element->reference.handle,
+						  &device);
+			if (ret)
+				return -EINVAL;
+
+			nargs = 0;
+			element++;
+
+			/*
+			 * Find the referred data extension node under the
+			 * referred device node.
+			 */
+			for (ref_fwnode = acpi_fwnode_handle(device);
+			     element < end && element->type == ACPI_TYPE_STRING;
+			     element++) {
+				ref_fwnode = acpi_fwnode_get_named_child_node(
+					ref_fwnode, element->string.pointer);
+				if (!ref_fwnode)
+					return -EINVAL;
+			}
+
+			/* assume following integer elements are all args */
+			for (i = 0; element + i < end && i < num_args; i++) {
+				int type = element[i].type;
+
+				if (type == ACPI_TYPE_INTEGER)
+					nargs++;
+				else if (type == ACPI_TYPE_LOCAL_REFERENCE)
+					break;
+				else
+					return -EINVAL;
+			}
+
+			if (nargs > NR_FWNODE_REFERENCE_ARGS)
+				return -EINVAL;
+
+			if (idx == index) {
+				args->fwnode = ref_fwnode;
+				args->nargs = nargs;
+				for (i = 0; i < nargs; i++)
+					args->args[i] = element[i].integer.value;
+
+				return 0;
+			}
+
+			element += nargs;
+		} else if (element->type == ACPI_TYPE_INTEGER) {
+			if (idx == index)
+				return -ENOENT;
+			element++;
+		} else {
+			return -EINVAL;
+		}
+
+		idx++;
+	}
+
+	return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(__acpi_node_get_property_reference);
+
+static int acpi_data_prop_read_single(const struct acpi_device_data *data,
+				      const char *propname,
+				      enum dev_prop_type proptype, void *val)
+{
+	const union acpi_object *obj;
+	int ret;
+
+	if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) {
+		ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj);
+		if (ret)
+			return ret;
+
+		switch (proptype) {
+		case DEV_PROP_U8:
+			if (obj->integer.value > U8_MAX)
+				return -EOVERFLOW;
+
+			if (val)
+				*(u8 *)val = obj->integer.value;
+
+			break;
+		case DEV_PROP_U16:
+			if (obj->integer.value > U16_MAX)
+				return -EOVERFLOW;
+
+			if (val)
+				*(u16 *)val = obj->integer.value;
+
+			break;
+		case DEV_PROP_U32:
+			if (obj->integer.value > U32_MAX)
+				return -EOVERFLOW;
+
+			if (val)
+				*(u32 *)val = obj->integer.value;
+
+			break;
+		default:
+			if (val)
+				*(u64 *)val = obj->integer.value;
+
+			break;
+		}
+
+		if (!val)
+			return 1;
+	} else if (proptype == DEV_PROP_STRING) {
+		ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj);
+		if (ret)
+			return ret;
+
+		if (val)
+			*(char **)val = obj->string.pointer;
+
+		return 1;
+	} else {
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
+			      enum dev_prop_type proptype, void *val)
+{
+	int ret;
+
+	if (!adev || !val)
+		return -EINVAL;
+
+	ret = acpi_data_prop_read_single(&adev->data, propname, proptype, val);
+	if (ret < 0 || proptype != ACPI_TYPE_STRING)
+		return ret;
+	return 0;
+}
+
+static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val,
+				       size_t nval)
+{
+	int i;
+
+	for (i = 0; i < nval; i++) {
+		if (items[i].type != ACPI_TYPE_INTEGER)
+			return -EPROTO;
+		if (items[i].integer.value > U8_MAX)
+			return -EOVERFLOW;
+
+		val[i] = items[i].integer.value;
+	}
+	return 0;
+}
+
+static int acpi_copy_property_array_u16(const union acpi_object *items,
+					u16 *val, size_t nval)
+{
+	int i;
+
+	for (i = 0; i < nval; i++) {
+		if (items[i].type != ACPI_TYPE_INTEGER)
+			return -EPROTO;
+		if (items[i].integer.value > U16_MAX)
+			return -EOVERFLOW;
+
+		val[i] = items[i].integer.value;
+	}
+	return 0;
+}
+
+static int acpi_copy_property_array_u32(const union acpi_object *items,
+					u32 *val, size_t nval)
+{
+	int i;
+
+	for (i = 0; i < nval; i++) {
+		if (items[i].type != ACPI_TYPE_INTEGER)
+			return -EPROTO;
+		if (items[i].integer.value > U32_MAX)
+			return -EOVERFLOW;
+
+		val[i] = items[i].integer.value;
+	}
+	return 0;
+}
+
+static int acpi_copy_property_array_u64(const union acpi_object *items,
+					u64 *val, size_t nval)
+{
+	int i;
+
+	for (i = 0; i < nval; i++) {
+		if (items[i].type != ACPI_TYPE_INTEGER)
+			return -EPROTO;
+
+		val[i] = items[i].integer.value;
+	}
+	return 0;
+}
+
+static int acpi_copy_property_array_string(const union acpi_object *items,
+					   char **val, size_t nval)
+{
+	int i;
+
+	for (i = 0; i < nval; i++) {
+		if (items[i].type != ACPI_TYPE_STRING)
+			return -EPROTO;
+
+		val[i] = items[i].string.pointer;
+	}
+	return nval;
+}
+
+static int acpi_data_prop_read(const struct acpi_device_data *data,
+			       const char *propname,
+			       enum dev_prop_type proptype,
+			       void *val, size_t nval)
+{
+	const union acpi_object *obj;
+	const union acpi_object *items;
+	int ret;
+
+	if (nval == 1 || !val) {
+		ret = acpi_data_prop_read_single(data, propname, proptype, val);
+		/*
+		 * The overflow error means that the property is there and it is
+		 * single-value, but its type does not match, so return.
+		 */
+		if (ret >= 0 || ret == -EOVERFLOW)
+			return ret;
+
+		/*
+		 * Reading this property as a single-value one failed, but its
+		 * value may still be represented as one-element array, so
+		 * continue.
+		 */
+	}
+
+	ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj);
+	if (ret)
+		return ret;
+
+	if (!val)
+		return obj->package.count;
+
+	if (proptype != DEV_PROP_STRING && nval > obj->package.count)
+		return -EOVERFLOW;
+	else if (nval <= 0)
+		return -EINVAL;
+
+	items = obj->package.elements;
+
+	switch (proptype) {
+	case DEV_PROP_U8:
+		ret = acpi_copy_property_array_u8(items, (u8 *)val, nval);
+		break;
+	case DEV_PROP_U16:
+		ret = acpi_copy_property_array_u16(items, (u16 *)val, nval);
+		break;
+	case DEV_PROP_U32:
+		ret = acpi_copy_property_array_u32(items, (u32 *)val, nval);
+		break;
+	case DEV_PROP_U64:
+		ret = acpi_copy_property_array_u64(items, (u64 *)val, nval);
+		break;
+	case DEV_PROP_STRING:
+		ret = acpi_copy_property_array_string(
+			items, (char **)val,
+			min_t(u32, nval, obj->package.count));
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+int acpi_dev_prop_read(const struct acpi_device *adev, const char *propname,
+		       enum dev_prop_type proptype, void *val, size_t nval)
+{
+	return adev ? acpi_data_prop_read(&adev->data, propname, proptype, val, nval) : -EINVAL;
+}
+
+/**
+ * acpi_node_prop_read - retrieve the value of an ACPI property with given name.
+ * @fwnode: Firmware node to get the property from.
+ * @propname: Name of the property.
+ * @proptype: Expected property type.
+ * @val: Location to store the property value (if not %NULL).
+ * @nval: Size of the array pointed to by @val.
+ *
+ * If @val is %NULL, return the number of array elements comprising the value
+ * of the property.  Otherwise, read at most @nval values to the array at the
+ * location pointed to by @val.
+ */
+int acpi_node_prop_read(const struct fwnode_handle *fwnode,
+			const char *propname, enum dev_prop_type proptype,
+			void *val, size_t nval)
+{
+	return acpi_data_prop_read(acpi_device_data_of_node(fwnode),
+				   propname, proptype, val, nval);
+}
+
+/**
+ * acpi_get_next_subnode - Return the next child node handle for a fwnode
+ * @fwnode: Firmware node to find the next child node for.
+ * @child: Handle to one of the device's child nodes or a null handle.
+ */
+struct fwnode_handle *acpi_get_next_subnode(const struct fwnode_handle *fwnode,
+					    struct fwnode_handle *child)
+{
+	const struct acpi_device *adev = to_acpi_device_node(fwnode);
+	const struct list_head *head;
+	struct list_head *next;
+
+	if (!child || is_acpi_device_node(child)) {
+		struct acpi_device *child_adev;
+
+		if (adev)
+			head = &adev->children;
+		else
+			goto nondev;
+
+		if (list_empty(head))
+			goto nondev;
+
+		if (child) {
+			adev = to_acpi_device_node(child);
+			next = adev->node.next;
+			if (next == head) {
+				child = NULL;
+				goto nondev;
+			}
+			child_adev = list_entry(next, struct acpi_device, node);
+		} else {
+			child_adev = list_first_entry(head, struct acpi_device,
+						      node);
+		}
+		return acpi_fwnode_handle(child_adev);
+	}
+
+ nondev:
+	if (!child || is_acpi_data_node(child)) {
+		const struct acpi_data_node *data = to_acpi_data_node(fwnode);
+		struct acpi_data_node *dn;
+
+		/*
+		 * We can have a combination of device and data nodes, e.g. with
+		 * hierarchical _DSD properties. Make sure the adev pointer is
+		 * restored before going through data nodes, otherwise we will
+		 * be looking for data_nodes below the last device found instead
+		 * of the common fwnode shared by device_nodes and data_nodes.
+		 */
+		adev = to_acpi_device_node(fwnode);
+		if (adev)
+			head = &adev->data.subnodes;
+		else if (data)
+			head = &data->data.subnodes;
+		else
+			return NULL;
+
+		if (list_empty(head))
+			return NULL;
+
+		if (child) {
+			dn = to_acpi_data_node(child);
+			next = dn->sibling.next;
+			if (next == head)
+				return NULL;
+
+			dn = list_entry(next, struct acpi_data_node, sibling);
+		} else {
+			dn = list_first_entry(head, struct acpi_data_node, sibling);
+		}
+		return &dn->fwnode;
+	}
+	return NULL;
+}
+
+/**
+ * acpi_node_get_parent - Return parent fwnode of this fwnode
+ * @fwnode: Firmware node whose parent to get
+ *
+ * Returns parent node of an ACPI device or data firmware node or %NULL if
+ * not available.
+ */
+struct fwnode_handle *acpi_node_get_parent(const struct fwnode_handle *fwnode)
+{
+	if (is_acpi_data_node(fwnode)) {
+		/* All data nodes have parent pointer so just return that */
+		return to_acpi_data_node(fwnode)->parent;
+	} else if (is_acpi_device_node(fwnode)) {
+		acpi_handle handle, parent_handle;
+
+		handle = to_acpi_device_node(fwnode)->handle;
+		if (ACPI_SUCCESS(acpi_get_parent(handle, &parent_handle))) {
+			struct acpi_device *adev;
+
+			if (!acpi_bus_get_device(parent_handle, &adev))
+				return acpi_fwnode_handle(adev);
+		}
+	}
+
+	return NULL;
+}
+
+/*
+ * Return true if the node is an ACPI graph node. Called on either ports
+ * or endpoints.
+ */
+static bool is_acpi_graph_node(struct fwnode_handle *fwnode,
+			       const char *str)
+{
+	unsigned int len = strlen(str);
+	const char *name;
+
+	if (!len || !is_acpi_data_node(fwnode))
+		return false;
+
+	name = to_acpi_data_node(fwnode)->name;
+
+	return (fwnode_property_present(fwnode, "reg") &&
+		!strncmp(name, str, len) && name[len] == '@') ||
+		fwnode_property_present(fwnode, str);
+}
+
+/**
+ * acpi_graph_get_next_endpoint - Get next endpoint ACPI firmware node
+ * @fwnode: Pointer to the parent firmware node
+ * @prev: Previous endpoint node or %NULL to get the first
+ *
+ * Looks up next endpoint ACPI firmware node below a given @fwnode. Returns
+ * %NULL if there is no next endpoint or in case of error. In case of success
+ * the next endpoint is returned.
+ */
+static struct fwnode_handle *acpi_graph_get_next_endpoint(
+	const struct fwnode_handle *fwnode, struct fwnode_handle *prev)
+{
+	struct fwnode_handle *port = NULL;
+	struct fwnode_handle *endpoint;
+
+	if (!prev) {
+		do {
+			port = fwnode_get_next_child_node(fwnode, port);
+			/*
+			 * The names of the port nodes begin with "port@"
+			 * followed by the number of the port node and they also
+			 * have a "reg" property that also has the number of the
+			 * port node. For compatibility reasons a node is also
+			 * recognised as a port node from the "port" property.
+			 */
+			if (is_acpi_graph_node(port, "port"))
+				break;
+		} while (port);
+	} else {
+		port = fwnode_get_parent(prev);
+	}
+
+	if (!port)
+		return NULL;
+
+	endpoint = fwnode_get_next_child_node(port, prev);
+	while (!endpoint) {
+		port = fwnode_get_next_child_node(fwnode, port);
+		if (!port)
+			break;
+		if (is_acpi_graph_node(port, "port"))
+			endpoint = fwnode_get_next_child_node(port, NULL);
+	}
+
+	/*
+	 * The names of the endpoint nodes begin with "endpoint@" followed by
+	 * the number of the endpoint node and they also have a "reg" property
+	 * that also has the number of the endpoint node. For compatibility
+	 * reasons a node is also recognised as an endpoint node from the
+	 * "endpoint" property.
+	 */
+	if (!is_acpi_graph_node(endpoint, "endpoint"))
+		return NULL;
+
+	return endpoint;
+}
+
+/**
+ * acpi_graph_get_child_prop_value - Return a child with a given property value
+ * @fwnode: device fwnode
+ * @prop_name: The name of the property to look for
+ * @val: the desired property value
+ *
+ * Return the port node corresponding to a given port number. Returns
+ * the child node on success, NULL otherwise.
+ */
+static struct fwnode_handle *acpi_graph_get_child_prop_value(
+	const struct fwnode_handle *fwnode, const char *prop_name,
+	unsigned int val)
+{
+	struct fwnode_handle *child;
+
+	fwnode_for_each_child_node(fwnode, child) {
+		u32 nr;
+
+		if (fwnode_property_read_u32(child, prop_name, &nr))
+			continue;
+
+		if (val == nr)
+			return child;
+	}
+
+	return NULL;
+}
+
+
+/**
+ * acpi_graph_get_remote_enpoint - Parses and returns remote end of an endpoint
+ * @fwnode: Endpoint firmware node pointing to a remote device
+ * @endpoint: Firmware node of remote endpoint is filled here if not %NULL
+ *
+ * Returns the remote endpoint corresponding to @__fwnode. NULL on error.
+ */
+static struct fwnode_handle *
+acpi_graph_get_remote_endpoint(const struct fwnode_handle *__fwnode)
+{
+	struct fwnode_handle *fwnode;
+	unsigned int port_nr, endpoint_nr;
+	struct fwnode_reference_args args;
+	int ret;
+
+	memset(&args, 0, sizeof(args));
+	ret = acpi_node_get_property_reference(__fwnode, "remote-endpoint", 0,
+					       &args);
+	if (ret)
+		return NULL;
+
+	/* Direct endpoint reference? */
+	if (!is_acpi_device_node(args.fwnode))
+		return args.nargs ? NULL : args.fwnode;
+
+	/*
+	 * Always require two arguments with the reference: port and
+	 * endpoint indices.
+	 */
+	if (args.nargs != 2)
+		return NULL;
+
+	fwnode = args.fwnode;
+	port_nr = args.args[0];
+	endpoint_nr = args.args[1];
+
+	fwnode = acpi_graph_get_child_prop_value(fwnode, "port", port_nr);
+
+	return acpi_graph_get_child_prop_value(fwnode, "endpoint", endpoint_nr);
+}
+
+static bool acpi_fwnode_device_is_available(const struct fwnode_handle *fwnode)
+{
+	if (!is_acpi_device_node(fwnode))
+		return false;
+
+	return acpi_device_is_present(to_acpi_device_node(fwnode));
+}
+
+static bool acpi_fwnode_property_present(const struct fwnode_handle *fwnode,
+					 const char *propname)
+{
+	return !acpi_node_prop_get(fwnode, propname, NULL);
+}
+
+static int
+acpi_fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
+				    const char *propname,
+				    unsigned int elem_size, void *val,
+				    size_t nval)
+{
+	enum dev_prop_type type;
+
+	switch (elem_size) {
+	case sizeof(u8):
+		type = DEV_PROP_U8;
+		break;
+	case sizeof(u16):
+		type = DEV_PROP_U16;
+		break;
+	case sizeof(u32):
+		type = DEV_PROP_U32;
+		break;
+	case sizeof(u64):
+		type = DEV_PROP_U64;
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	return acpi_node_prop_read(fwnode, propname, type, val, nval);
+}
+
+static int
+acpi_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
+				       const char *propname, const char **val,
+				       size_t nval)
+{
+	return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
+				   val, nval);
+}
+
+static int
+acpi_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
+			       const char *prop, const char *nargs_prop,
+			       unsigned int args_count, unsigned int index,
+			       struct fwnode_reference_args *args)
+{
+	return __acpi_node_get_property_reference(fwnode, prop, index,
+						  args_count, args);
+}
+
+static struct fwnode_handle *
+acpi_fwnode_get_parent(struct fwnode_handle *fwnode)
+{
+	return acpi_node_get_parent(fwnode);
+}
+
+static int acpi_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
+					    struct fwnode_endpoint *endpoint)
+{
+	struct fwnode_handle *port_fwnode = fwnode_get_parent(fwnode);
+
+	endpoint->local_fwnode = fwnode;
+
+	if (fwnode_property_read_u32(port_fwnode, "reg", &endpoint->port))
+		fwnode_property_read_u32(port_fwnode, "port", &endpoint->port);
+	if (fwnode_property_read_u32(fwnode, "reg", &endpoint->id))
+		fwnode_property_read_u32(fwnode, "endpoint", &endpoint->id);
+
+	return 0;
+}
+
+static const void *
+acpi_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
+				  const struct device *dev)
+{
+	return acpi_device_get_match_data(dev);
+}
+
+#define DECLARE_ACPI_FWNODE_OPS(ops) \
+	const struct fwnode_operations ops = {				\
+		.device_is_available = acpi_fwnode_device_is_available, \
+		.device_get_match_data = acpi_fwnode_device_get_match_data, \
+		.property_present = acpi_fwnode_property_present,	\
+		.property_read_int_array =				\
+			acpi_fwnode_property_read_int_array,		\
+		.property_read_string_array =				\
+			acpi_fwnode_property_read_string_array,		\
+		.get_parent = acpi_node_get_parent,			\
+		.get_next_child_node = acpi_get_next_subnode,		\
+		.get_named_child_node = acpi_fwnode_get_named_child_node, \
+		.get_reference_args = acpi_fwnode_get_reference_args,	\
+		.graph_get_next_endpoint =				\
+			acpi_graph_get_next_endpoint,			\
+		.graph_get_remote_endpoint =				\
+			acpi_graph_get_remote_endpoint,			\
+		.graph_get_port_parent = acpi_fwnode_get_parent,	\
+		.graph_parse_endpoint = acpi_fwnode_graph_parse_endpoint, \
+	};								\
+	EXPORT_SYMBOL_GPL(ops)
+
+DECLARE_ACPI_FWNODE_OPS(acpi_device_fwnode_ops);
+DECLARE_ACPI_FWNODE_OPS(acpi_data_fwnode_ops);
+const struct fwnode_operations acpi_static_fwnode_ops;
+
+bool is_acpi_device_node(const struct fwnode_handle *fwnode)
+{
+	return !IS_ERR_OR_NULL(fwnode) &&
+		fwnode->ops == &acpi_device_fwnode_ops;
+}
+EXPORT_SYMBOL(is_acpi_device_node);
+
+bool is_acpi_data_node(const struct fwnode_handle *fwnode)
+{
+	return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &acpi_data_fwnode_ops;
+}
+EXPORT_SYMBOL(is_acpi_data_node);