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-rw-r--r--drivers/acpi/property.c133
-rw-r--r--include/acpi/acpi_bus.h9
-rw-r--r--include/linux/fwnode.h1
3 files changed, 142 insertions, 1 deletions
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 8163b4bd7a61..17c436de376b 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -24,6 +24,115 @@ static const u8 prp_uuid[16] = {
0x14, 0xd8, 0xff, 0xda, 0xba, 0x6e, 0x8c, 0x4d,
0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01
};
+/* ACPI _DSD data subnodes UUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
+static const u8 ads_uuid[16] = {
+ 0xe6, 0xe3, 0xb8, 0xdb, 0x86, 0x58, 0xa6, 0x4b,
+ 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);
+static bool acpi_extract_properties(const union acpi_object *desc,
+ struct acpi_device_data *data);
+
+static bool acpi_nondev_subnode_ok(acpi_handle scope,
+ const union acpi_object *link,
+ struct list_head *list)
+{
+ struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+ struct acpi_data_node *dn;
+ acpi_handle handle;
+ acpi_status status;
+
+ dn = kzalloc(sizeof(*dn), GFP_KERNEL);
+ if (!dn)
+ return false;
+
+ dn->name = link->package.elements[0].string.pointer;
+ dn->fwnode.type = FWNODE_ACPI_DATA;
+ INIT_LIST_HEAD(&dn->data.subnodes);
+
+ status = acpi_get_handle(scope, link->package.elements[1].string.pointer,
+ &handle);
+ if (ACPI_FAILURE(status))
+ goto fail;
+
+ status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf,
+ ACPI_TYPE_PACKAGE);
+ if (ACPI_FAILURE(status))
+ goto fail;
+
+ if (acpi_extract_properties(buf.pointer, &dn->data))
+ dn->data.pointer = buf.pointer;
+
+ if (acpi_enumerate_nondev_subnodes(scope, buf.pointer, &dn->data))
+ dn->data.pointer = buf.pointer;
+
+ if (dn->data.pointer) {
+ list_add_tail(&dn->sibling, list);
+ return true;
+ }
+
+ acpi_handle_debug(handle, "Invalid properties/subnodes data, skipping\n");
+
+ fail:
+ ACPI_FREE(buf.pointer);
+ kfree(dn);
+ return false;
+}
+
+static int acpi_add_nondev_subnodes(acpi_handle scope,
+ const union acpi_object *links,
+ struct list_head *list)
+{
+ bool ret = false;
+ int i;
+
+ for (i = 0; i < links->package.count; i++) {
+ const union acpi_object *link;
+
+ link = &links->package.elements[i];
+ /* Only two elements allowed, both must be strings. */
+ if (link->package.count == 2
+ && link->package.elements[0].type == ACPI_TYPE_STRING
+ && link->package.elements[1].type == ACPI_TYPE_STRING
+ && acpi_nondev_subnode_ok(scope, link, list))
+ ret = true;
+ }
+
+ return ret;
+}
+
+static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
+ const union acpi_object *desc,
+ struct acpi_device_data *data)
+{
+ int i;
+
+ /* Look for the ACPI data subnodes UUID. */
+ for (i = 0; i < desc->package.count; i += 2) {
+ const union acpi_object *uuid, *links;
+
+ uuid = &desc->package.elements[i];
+ links = &desc->package.elements[i + 1];
+
+ /*
+ * The first element must be a UUID and the second one must be
+ * a package.
+ */
+ if (uuid->type != ACPI_TYPE_BUFFER || uuid->buffer.length != 16
+ || links->type != ACPI_TYPE_PACKAGE)
+ break;
+
+ if (memcmp(uuid->buffer.pointer, ads_uuid, sizeof(ads_uuid)))
+ continue;
+
+ return acpi_add_nondev_subnodes(scope, links, &data->subnodes);
+ }
+
+ return false;
+}
static bool acpi_property_value_ok(const union acpi_object *value)
{
@@ -147,6 +256,8 @@ void acpi_init_properties(struct acpi_device *adev)
acpi_status status;
bool acpi_of = false;
+ INIT_LIST_HEAD(&adev->data.subnodes);
+
/*
* Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
* Device Tree compatible properties for this device.
@@ -167,7 +278,11 @@ void acpi_init_properties(struct acpi_device *adev)
adev->data.pointer = buf.pointer;
if (acpi_of)
acpi_init_of_compatible(adev);
- } else {
+ }
+ if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer, &adev->data))
+ adev->data.pointer = buf.pointer;
+
+ if (!adev->data.pointer) {
acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
ACPI_FREE(buf.pointer);
}
@@ -178,8 +293,24 @@ void acpi_init_properties(struct acpi_device *adev)
ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n");
}
+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);
+ 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;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 5ba8fb64f664..79cfee646d6b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -343,6 +343,7 @@ struct acpi_device_data {
const union acpi_object *pointer;
const union acpi_object *properties;
const union acpi_object *of_compatible;
+ struct list_head subnodes;
};
struct acpi_gpio_mapping;
@@ -378,6 +379,14 @@ struct acpi_device {
void (*remove)(struct acpi_device *);
};
+/* Non-device subnode */
+struct acpi_data_node {
+ const char *name;
+ struct fwnode_handle fwnode;
+ struct acpi_device_data data;
+ struct list_head sibling;
+};
+
static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)
{
bool ret = false;
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 0408545bce42..b08d6ba5c1e6 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -16,6 +16,7 @@ enum fwnode_type {
FWNODE_INVALID = 0,
FWNODE_OF,
FWNODE_ACPI,
+ FWNODE_ACPI_DATA,
FWNODE_PDATA,
};