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-rw-r--r--drivers/acpi/property.c1623
1 files changed, 1623 insertions, 0 deletions
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
new file mode 100644
index 0000000000..4d958a165d
--- /dev/null
+++ b/drivers/acpi/property.c
@@ -0,0 +1,1623 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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>
+ */
+
+#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);
+
+/*
+ * The GUIDs here are made equivalent to each other in order to avoid extra
+ * complexity in the properties handling code, with the caveat that the
+ * kernel will accept certain combinations of GUID and properties that are
+ * not defined without a warning. For instance if any of the properties
+ * from different GUID appear in a property list of another, it will be
+ * accepted by the kernel. Firmware validation tools should catch these.
+ */
+static const guid_t prp_guids[] = {
+ /* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
+ GUID_INIT(0xdaffd814, 0x6eba, 0x4d8c,
+ 0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01),
+ /* Hotplug in D3 GUID: 6211e2c0-58a3-4af3-90e1-927a4e0c55a4 */
+ GUID_INIT(0x6211e2c0, 0x58a3, 0x4af3,
+ 0x90, 0xe1, 0x92, 0x7a, 0x4e, 0x0c, 0x55, 0xa4),
+ /* External facing port GUID: efcc06cc-73ac-4bc3-bff0-76143807c389 */
+ GUID_INIT(0xefcc06cc, 0x73ac, 0x4bc3,
+ 0xbf, 0xf0, 0x76, 0x14, 0x38, 0x07, 0xc3, 0x89),
+ /* Thunderbolt GUID for IMR_VALID: c44d002f-69f9-4e7d-a904-a7baabdf43f7 */
+ GUID_INIT(0xc44d002f, 0x69f9, 0x4e7d,
+ 0xa9, 0x04, 0xa7, 0xba, 0xab, 0xdf, 0x43, 0xf7),
+ /* Thunderbolt GUID for WAKE_SUPPORTED: 6c501103-c189-4296-ba72-9bf5a26ebe5d */
+ GUID_INIT(0x6c501103, 0xc189, 0x4296,
+ 0xba, 0x72, 0x9b, 0xf5, 0xa2, 0x6e, 0xbe, 0x5d),
+ /* Storage device needs D3 GUID: 5025030f-842f-4ab4-a561-99a5189762d0 */
+ GUID_INIT(0x5025030f, 0x842f, 0x4ab4,
+ 0xa5, 0x61, 0x99, 0xa5, 0x18, 0x97, 0x62, 0xd0),
+};
+
+/* 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 const guid_t buffer_prop_guid =
+ GUID_INIT(0xedb12dd0, 0x363d, 0x4085,
+ 0xa3, 0xd2, 0x49, 0x52, 0x2c, 0xa1, 0x60, 0xc4);
+
+static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
+ union acpi_object *desc,
+ struct acpi_device_data *data,
+ struct fwnode_handle *parent);
+static bool acpi_extract_properties(acpi_handle handle,
+ union acpi_object *desc,
+ struct acpi_device_data *data);
+
+static bool acpi_nondev_subnode_extract(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;
+ fwnode_init(&dn->fwnode, &acpi_data_fwnode_ops);
+ dn->parent = parent;
+ INIT_LIST_HEAD(&dn->data.properties);
+ INIT_LIST_HEAD(&dn->data.subnodes);
+
+ result = acpi_extract_properties(handle, 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 bool acpi_add_nondev_subnodes(acpi_handle scope,
+ 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++) {
+ 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,
+ 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;
+ union acpi_object *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) {
+ struct acpi_device *parent;
+
+ parent = acpi_dev_parent(adev);
+ if (parent && parent->flags.of_compatible_ok)
+ goto out;
+
+ return;
+ }
+ }
+ adev->data.of_compatible = of_compatible;
+
+ out:
+ adev->flags.of_compatible_ok = 1;
+}
+
+static bool acpi_is_property_guid(const guid_t *guid)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(prp_guids); i++) {
+ if (guid_equal(guid, &prp_guids[i]))
+ return true;
+ }
+
+ return false;
+}
+
+struct acpi_device_properties *
+acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
+ union acpi_object *properties)
+{
+ struct acpi_device_properties *props;
+
+ props = kzalloc(sizeof(*props), GFP_KERNEL);
+ if (props) {
+ INIT_LIST_HEAD(&props->list);
+ props->guid = guid;
+ props->properties = properties;
+ list_add_tail(&props->list, &data->properties);
+ }
+
+ return props;
+}
+
+static void acpi_nondev_subnode_tag(acpi_handle handle, void *context)
+{
+}
+
+static void acpi_untie_nondev_subnodes(struct acpi_device_data *data)
+{
+ struct acpi_data_node *dn;
+
+ list_for_each_entry(dn, &data->subnodes, sibling) {
+ acpi_detach_data(dn->handle, acpi_nondev_subnode_tag);
+
+ acpi_untie_nondev_subnodes(&dn->data);
+ }
+}
+
+static bool acpi_tie_nondev_subnodes(struct acpi_device_data *data)
+{
+ struct acpi_data_node *dn;
+
+ list_for_each_entry(dn, &data->subnodes, sibling) {
+ acpi_status status;
+ bool ret;
+
+ status = acpi_attach_data(dn->handle, acpi_nondev_subnode_tag, dn);
+ if (ACPI_FAILURE(status) && status != AE_ALREADY_EXISTS) {
+ acpi_handle_err(dn->handle, "Can't tag data node\n");
+ return false;
+ }
+
+ ret = acpi_tie_nondev_subnodes(&dn->data);
+ if (!ret)
+ return ret;
+ }
+
+ return true;
+}
+
+static void acpi_data_add_buffer_props(acpi_handle handle,
+ struct acpi_device_data *data,
+ union acpi_object *properties)
+{
+ struct acpi_device_properties *props;
+ union acpi_object *package;
+ size_t alloc_size;
+ unsigned int i;
+ u32 *count;
+
+ if (check_mul_overflow((size_t)properties->package.count,
+ sizeof(*package) + sizeof(void *),
+ &alloc_size) ||
+ check_add_overflow(sizeof(*props) + sizeof(*package), alloc_size,
+ &alloc_size)) {
+ acpi_handle_warn(handle,
+ "can't allocate memory for %u buffer props",
+ properties->package.count);
+ return;
+ }
+
+ props = kvzalloc(alloc_size, GFP_KERNEL);
+ if (!props)
+ return;
+
+ props->guid = &buffer_prop_guid;
+ props->bufs = (void *)(props + 1);
+ props->properties = (void *)(props->bufs + properties->package.count);
+
+ /* Outer package */
+ package = props->properties;
+ package->type = ACPI_TYPE_PACKAGE;
+ package->package.elements = package + 1;
+ count = &package->package.count;
+ *count = 0;
+
+ /* Inner packages */
+ package++;
+
+ for (i = 0; i < properties->package.count; i++) {
+ struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+ union acpi_object *property = &properties->package.elements[i];
+ union acpi_object *prop, *obj, *buf_obj;
+ acpi_status status;
+
+ if (property->type != ACPI_TYPE_PACKAGE ||
+ property->package.count != 2) {
+ acpi_handle_warn(handle,
+ "buffer property %u has %u entries\n",
+ i, property->package.count);
+ continue;
+ }
+
+ prop = &property->package.elements[0];
+ obj = &property->package.elements[1];
+
+ if (prop->type != ACPI_TYPE_STRING ||
+ obj->type != ACPI_TYPE_STRING) {
+ acpi_handle_warn(handle,
+ "wrong object types %u and %u\n",
+ prop->type, obj->type);
+ continue;
+ }
+
+ status = acpi_evaluate_object_typed(handle, obj->string.pointer,
+ NULL, &buf,
+ ACPI_TYPE_BUFFER);
+ if (ACPI_FAILURE(status)) {
+ acpi_handle_warn(handle,
+ "can't evaluate \"%*pE\" as buffer\n",
+ obj->string.length,
+ obj->string.pointer);
+ continue;
+ }
+
+ package->type = ACPI_TYPE_PACKAGE;
+ package->package.elements = prop;
+ package->package.count = 2;
+
+ buf_obj = buf.pointer;
+
+ /* Replace the string object with a buffer object */
+ obj->type = ACPI_TYPE_BUFFER;
+ obj->buffer.length = buf_obj->buffer.length;
+ obj->buffer.pointer = buf_obj->buffer.pointer;
+
+ props->bufs[i] = buf.pointer;
+ package++;
+ (*count)++;
+ }
+
+ if (*count)
+ list_add(&props->list, &data->properties);
+ else
+ kvfree(props);
+}
+
+static bool acpi_extract_properties(acpi_handle scope, 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;
+ union acpi_object *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,
+ &buffer_prop_guid)) {
+ acpi_data_add_buffer_props(scope, data, properties);
+ continue;
+ }
+
+ if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
+ continue;
+
+ /*
+ * We found the matching GUID. Now validate the format of the
+ * package immediately following it.
+ */
+ if (!acpi_properties_format_valid(properties))
+ continue;
+
+ acpi_data_add_props(data, (const guid_t *)guid->buffer.pointer,
+ properties);
+ }
+
+ return !list_empty(&data->properties);
+}
+
+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.properties);
+ 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(adev->handle, 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);
+ } else {
+ if (!acpi_tie_nondev_subnodes(&adev->data))
+ acpi_untie_nondev_subnodes(&adev->data);
+ }
+
+ 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_free_device_properties(struct list_head *list)
+{
+ struct acpi_device_properties *props, *tmp;
+
+ list_for_each_entry_safe(props, tmp, list, list) {
+ u32 i;
+
+ list_del(&props->list);
+ /* Buffer data properties were separately allocated */
+ if (props->bufs)
+ for (i = 0; i < props->properties->package.count; i++)
+ ACPI_FREE(props->bufs[i]);
+ kvfree(props);
+ }
+}
+
+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);
+ acpi_free_device_properties(&dn->data.properties);
+ kfree(dn);
+ }
+}
+
+void acpi_free_properties(struct acpi_device *adev)
+{
+ acpi_untie_nondev_subnodes(&adev->data);
+ acpi_destroy_nondev_subnodes(&adev->data.subnodes);
+ ACPI_FREE((void *)adev->data.pointer);
+ adev->data.of_compatible = NULL;
+ adev->data.pointer = NULL;
+ acpi_free_device_properties(&adev->data.properties);
+}
+
+/**
+ * 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 struct acpi_device_properties *props;
+
+ if (!data || !name)
+ return -EINVAL;
+
+ if (!data->pointer || list_empty(&data->properties))
+ return -EINVAL;
+
+ list_for_each_entry(props, &data->properties, list) {
+ const union acpi_object *properties;
+ unsigned int i;
+
+ properties = props->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;
+ }
+ 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
+ * @data: 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;
+
+ fwnode_for_each_child_node(fwnode, child) {
+ if (is_acpi_data_node(child)) {
+ if (acpi_data_node_match(child, childname))
+ return child;
+ continue;
+ }
+
+ if (!strncmp(acpi_device_bid(to_acpi_device_node(child)),
+ childname, ACPI_NAMESEG_SIZE))
+ return child;
+ }
+
+ return NULL;
+}
+
+static int acpi_get_ref_args(struct fwnode_reference_args *args,
+ struct fwnode_handle *ref_fwnode,
+ const union acpi_object **element,
+ const union acpi_object *end, size_t num_args)
+{
+ u32 nargs = 0, i;
+
+ /*
+ * Find the referred data extension node under the
+ * referred device node.
+ */
+ for (; *element < end && (*element)->type == ACPI_TYPE_STRING;
+ (*element)++) {
+ const char *child_name = (*element)->string.pointer;
+
+ ref_fwnode = acpi_fwnode_get_named_child_node(ref_fwnode, child_name);
+ if (!ref_fwnode)
+ return -EINVAL;
+ }
+
+ /*
+ * Assume the following integer elements are all args. Stop counting on
+ * the first reference or end of the package arguments. In case of
+ * neither reference, nor integer, return an error, we can't parse it.
+ */
+ for (i = 0; (*element) + i < end && i < num_args; i++) {
+ acpi_object_type type = (*element)[i].type;
+
+ if (type == ACPI_TYPE_LOCAL_REFERENCE)
+ break;
+
+ if (type == ACPI_TYPE_INTEGER)
+ nargs++;
+ else
+ return -EINVAL;
+ }
+
+ if (nargs > NR_FWNODE_REFERENCE_ARGS)
+ return -EINVAL;
+
+ if (args) {
+ args->fwnode = ref_fwnode;
+ args->nargs = nargs;
+ for (i = 0; i < nargs; i++)
+ args->args[i] = (*element)[i].integer.value;
+ }
+
+ (*element) += nargs;
+
+ return 0;
+}
+
+/**
+ * __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
+ * (may be NULL)
+ *
+ * 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;
+
+ switch (obj->type) {
+ case ACPI_TYPE_LOCAL_REFERENCE:
+ /* Plain single reference without arguments. */
+ if (index)
+ return -ENOENT;
+
+ device = acpi_fetch_acpi_dev(obj->reference.handle);
+ if (!device)
+ return -EINVAL;
+
+ if (!args)
+ return 0;
+
+ args->fwnode = acpi_fwnode_handle(device);
+ args->nargs = 0;
+ return 0;
+ case ACPI_TYPE_PACKAGE:
+ /*
+ * 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).
+ */
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (index >= obj->package.count)
+ return -ENOENT;
+
+ element = obj->package.elements;
+ end = element + obj->package.count;
+
+ while (element < end) {
+ switch (element->type) {
+ case ACPI_TYPE_LOCAL_REFERENCE:
+ device = acpi_fetch_acpi_dev(element->reference.handle);
+ if (!device)
+ return -EINVAL;
+
+ element++;
+
+ ret = acpi_get_ref_args(idx == index ? args : NULL,
+ acpi_fwnode_handle(device),
+ &element, end, num_args);
+ if (ret < 0)
+ return ret;
+
+ if (idx == index)
+ return 0;
+
+ break;
+ case ACPI_TYPE_INTEGER:
+ if (idx == index)
+ return -ENOENT;
+ element++;
+ break;
+ default:
+ 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 = 0;
+
+ if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64)
+ ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj);
+ else if (proptype == DEV_PROP_STRING)
+ ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &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;
+ case DEV_PROP_U64:
+ if (val)
+ *(u64 *)val = obj->integer.value;
+ break;
+ case DEV_PROP_STRING:
+ if (val)
+ *(char **)val = obj->string.pointer;
+ return 1;
+ default:
+ return -EINVAL;
+ }
+
+ /* When no storage provided return number of available values */
+ return val ? 0 : 1;
+}
+
+#define acpi_copy_property_array_uint(items, val, nval) \
+ ({ \
+ typeof(items) __items = items; \
+ typeof(val) __val = val; \
+ typeof(nval) __nval = nval; \
+ size_t i; \
+ int ret = 0; \
+ \
+ for (i = 0; i < __nval; i++) { \
+ if (__items->type == ACPI_TYPE_BUFFER) { \
+ __val[i] = __items->buffer.pointer[i]; \
+ continue; \
+ } \
+ if (__items[i].type != ACPI_TYPE_INTEGER) { \
+ ret = -EPROTO; \
+ break; \
+ } \
+ if (__items[i].integer.value > _Generic(__val, \
+ u8 *: U8_MAX, \
+ u16 *: U16_MAX, \
+ u32 *: U32_MAX, \
+ u64 *: U64_MAX)) { \
+ ret = -EOVERFLOW; \
+ break; \
+ } \
+ \
+ __val[i] = __items[i].integer.value; \
+ } \
+ ret; \
+ })
+
+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 && proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64)
+ ret = acpi_data_get_property(data, propname, ACPI_TYPE_BUFFER,
+ &obj);
+ if (ret)
+ return ret;
+
+ if (!val) {
+ if (obj->type == ACPI_TYPE_BUFFER)
+ return obj->buffer.length;
+
+ return obj->package.count;
+ }
+
+ switch (proptype) {
+ case DEV_PROP_STRING:
+ break;
+ default:
+ if (obj->type == ACPI_TYPE_BUFFER) {
+ if (nval > obj->buffer.length)
+ return -EOVERFLOW;
+ } else {
+ if (nval > obj->package.count)
+ return -EOVERFLOW;
+ }
+ break;
+ }
+ if (nval == 0)
+ return -EINVAL;
+
+ if (obj->type == ACPI_TYPE_BUFFER) {
+ if (proptype != DEV_PROP_U8)
+ return -EPROTO;
+ items = obj;
+ } else {
+ items = obj->package.elements;
+ }
+
+ switch (proptype) {
+ case DEV_PROP_U8:
+ ret = acpi_copy_property_array_uint(items, (u8 *)val, nval);
+ break;
+ case DEV_PROP_U16:
+ ret = acpi_copy_property_array_uint(items, (u16 *)val, nval);
+ break;
+ case DEV_PROP_U32:
+ ret = acpi_copy_property_array_uint(items, (u32 *)val, nval);
+ break;
+ case DEV_PROP_U64:
+ ret = acpi_copy_property_array_uint(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;
+}
+
+/**
+ * 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.
+ */
+static 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);
+}
+
+static int stop_on_next(struct acpi_device *adev, void *data)
+{
+ struct acpi_device **ret_p = data;
+
+ if (!*ret_p) {
+ *ret_p = adev;
+ return 1;
+ }
+
+ /* Skip until the "previous" object is found. */
+ if (*ret_p == adev)
+ *ret_p = NULL;
+
+ return 0;
+}
+
+/**
+ * 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)
+{
+ struct acpi_device *adev = to_acpi_device_node(fwnode);
+
+ if ((!child || is_acpi_device_node(child)) && adev) {
+ struct acpi_device *child_adev = to_acpi_device_node(child);
+
+ acpi_dev_for_each_child(adev, stop_on_next, &child_adev);
+ if (child_adev)
+ return acpi_fwnode_handle(child_adev);
+
+ child = NULL;
+ }
+
+ if (!child || is_acpi_data_node(child)) {
+ const struct acpi_data_node *data = to_acpi_data_node(fwnode);
+ const struct list_head *head;
+ struct list_head *next;
+ 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.
+ */
+static 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;
+ }
+ if (is_acpi_device_node(fwnode)) {
+ struct acpi_device *parent;
+
+ parent = acpi_dev_parent(to_acpi_device_node(fwnode));
+ if (parent)
+ return acpi_fwnode_handle(parent);
+ }
+
+ 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_endpoint - Parses and returns remote end of an endpoint
+ * @__fwnode: Endpoint firmware node pointing to a remote device
+ *
+ * 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 const void *
+acpi_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
+ const struct device *dev)
+{
+ return acpi_device_get_match_data(dev);
+}
+
+static bool acpi_fwnode_device_dma_supported(const struct fwnode_handle *fwnode)
+{
+ return acpi_dma_supported(to_acpi_device_node(fwnode));
+}
+
+static enum dev_dma_attr
+acpi_fwnode_device_get_dma_attr(const struct fwnode_handle *fwnode)
+{
+ return acpi_get_dma_attr(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 const char *acpi_fwnode_get_name(const struct fwnode_handle *fwnode)
+{
+ const struct acpi_device *adev;
+ struct fwnode_handle *parent;
+
+ /* Is this the root node? */
+ parent = fwnode_get_parent(fwnode);
+ if (!parent)
+ return "\\";
+
+ fwnode_handle_put(parent);
+
+ if (is_acpi_data_node(fwnode)) {
+ const struct acpi_data_node *dn = to_acpi_data_node(fwnode);
+
+ return dn->name;
+ }
+
+ adev = to_acpi_device_node(fwnode);
+ if (WARN_ON(!adev))
+ return NULL;
+
+ return acpi_device_bid(adev);
+}
+
+static const char *
+acpi_fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *parent;
+
+ /* Is this the root node? */
+ parent = fwnode_get_parent(fwnode);
+ if (!parent)
+ return "";
+
+ /* Is this 2nd node from the root? */
+ parent = fwnode_get_next_parent(parent);
+ if (!parent)
+ return "";
+
+ fwnode_handle_put(parent);
+
+ /* ACPI device or data node. */
+ return ".";
+}
+
+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 int acpi_fwnode_irq_get(const struct fwnode_handle *fwnode,
+ unsigned int index)
+{
+ struct resource res;
+ int ret;
+
+ ret = acpi_irq_get(ACPI_HANDLE_FWNODE(fwnode), index, &res);
+ if (ret)
+ return ret;
+
+ return res.start;
+}
+
+#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, \
+ .device_dma_supported = \
+ acpi_fwnode_device_dma_supported, \
+ .device_get_dma_attr = acpi_fwnode_device_get_dma_attr, \
+ .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_name = acpi_fwnode_get_name, \
+ .get_name_prefix = acpi_fwnode_get_name_prefix, \
+ .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, \
+ .irq_get = acpi_fwnode_irq_get, \
+ }; \
+ 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);