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-rw-r--r--drivers/acpi/property.c72
-rw-r--r--include/acpi/acpi_bus.h1
-rw-r--r--include/linux/acpi.h7
3 files changed, 65 insertions, 15 deletions
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 3afddcd834ef..587c9d000f0e 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -37,14 +37,16 @@ static const u8 ads_uuid[16] = {
static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
const union acpi_object *desc,
- struct acpi_device_data *data);
+ 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 list_head *list,
+ struct fwnode_handle *parent)
{
struct acpi_data_node *dn;
bool result;
@@ -55,6 +57,7 @@ static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
dn->name = link->package.elements[0].string.pointer;
dn->fwnode.type = FWNODE_ACPI_DATA;
+ dn->parent = parent;
INIT_LIST_HEAD(&dn->data.subnodes);
result = acpi_extract_properties(desc, &dn->data);
@@ -71,9 +74,11 @@ static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
*/
status = acpi_get_parent(handle, &scope);
if (ACPI_SUCCESS(status)
- && acpi_enumerate_nondev_subnodes(scope, desc, &dn->data))
+ && acpi_enumerate_nondev_subnodes(scope, desc, &dn->data,
+ &dn->fwnode))
result = true;
- } else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data)) {
+ } else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data,
+ &dn->fwnode)) {
result = true;
}
@@ -91,7 +96,8 @@ static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
static bool acpi_nondev_subnode_data_ok(acpi_handle handle,
const union acpi_object *link,
- struct list_head *list)
+ struct list_head *list,
+ struct fwnode_handle *parent)
{
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
acpi_status status;
@@ -101,7 +107,8 @@ static bool acpi_nondev_subnode_data_ok(acpi_handle handle,
if (ACPI_FAILURE(status))
return false;
- if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list))
+ if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list,
+ parent))
return true;
ACPI_FREE(buf.pointer);
@@ -110,7 +117,8 @@ static bool acpi_nondev_subnode_data_ok(acpi_handle handle,
static bool acpi_nondev_subnode_ok(acpi_handle scope,
const union acpi_object *link,
- struct list_head *list)
+ struct list_head *list,
+ struct fwnode_handle *parent)
{
acpi_handle handle;
acpi_status status;
@@ -123,12 +131,13 @@ static bool acpi_nondev_subnode_ok(acpi_handle scope,
if (ACPI_FAILURE(status))
return false;
- return acpi_nondev_subnode_data_ok(handle, link, list);
+ 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 list_head *list,
+ struct fwnode_handle *parent)
{
bool ret = false;
int i;
@@ -150,15 +159,18 @@ static int acpi_add_nondev_subnodes(acpi_handle scope,
/* 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);
+ 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);
+ 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);
+ result = acpi_nondev_subnode_extract(desc, NULL, link,
+ list, parent);
break;
default:
result = false;
@@ -172,7 +184,8 @@ static int acpi_add_nondev_subnodes(acpi_handle scope,
static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
const union acpi_object *desc,
- struct acpi_device_data *data)
+ struct acpi_device_data *data,
+ struct fwnode_handle *parent)
{
int i;
@@ -194,7 +207,8 @@ static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
if (memcmp(uuid->buffer.pointer, ads_uuid, sizeof(ads_uuid)))
continue;
- return acpi_add_nondev_subnodes(scope, links, &data->subnodes);
+ return acpi_add_nondev_subnodes(scope, links, &data->subnodes,
+ parent);
}
return false;
@@ -345,7 +359,8 @@ void acpi_init_properties(struct acpi_device *adev)
if (acpi_of)
acpi_init_of_compatible(adev);
}
- if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer, &adev->data))
+ if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer,
+ &adev->data, acpi_fwnode_handle(adev)))
adev->data.pointer = buf.pointer;
if (!adev->data.pointer) {
@@ -920,3 +935,30 @@ struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
}
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(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;
+}
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index ef0ae8aaa567..49cca52b214b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -386,6 +386,7 @@ struct acpi_data_node {
const char *name;
acpi_handle handle;
struct fwnode_handle fwnode;
+ struct fwnode_handle *parent;
struct acpi_device_data data;
struct list_head sibling;
struct kobject kobj;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 9b05886f9773..e74e8bdbb6af 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -999,6 +999,7 @@ int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
struct fwnode_handle *subnode);
+struct fwnode_handle *acpi_node_get_parent(struct fwnode_handle *fwnode);
struct acpi_probe_entry;
typedef bool (*acpi_probe_entry_validate_subtbl)(struct acpi_subtable_header *,
@@ -1121,6 +1122,12 @@ static inline struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
return NULL;
}
+static inline struct fwnode_handle *
+acpi_node_get_parent(struct fwnode_handle *fwnode)
+{
+ return NULL;
+}
+
#define ACPI_DECLARE_PROBE_ENTRY(table, name, table_id, subtable, valid, data, fn) \
static const void * __acpi_table_##name[] \
__attribute__((unused)) \
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