static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node)
{
acpi_status status;
struct acpi_pnp_device_id *hid;
struct acpi_pnp_device_id_list *cid;
u32 i;
u8 match;
/* Get the _HID and check for a PCI Root Bridge */
status = acpi_ut_execute_HID(node, &hid);
if (ACPI_FAILURE(status)) {
return (FALSE);
}
match = acpi_ut_is_pci_root_bridge(hid->string);
ACPI_FREE(hid);
if (match) {
return (TRUE);
}
/* The _HID did not match. Get the _CID and check for a PCI Root Bridge */
status = acpi_ut_execute_CID(node, &cid);
if (ACPI_FAILURE(status)) {
return (FALSE);
}
/* Check all _CIDs in the returned list */
for (i = 0; i < cid->count; i++) {
if (acpi_ut_is_pci_root_bridge(cid->ids[i].string)) {
ACPI_FREE(cid);
return (TRUE);
}
}
ACPI_FREE(cid);
return (FALSE);
}
static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node)
{
acpi_status status;
struct acpica_device_id hid;
struct acpi_compatible_id_list *cid;
acpi_native_uint i;
/*
* Get the _HID and check for a PCI Root Bridge
*/
status = acpi_ut_execute_HID(node, &hid);
if (ACPI_FAILURE(status)) {
return (FALSE);
}
if (acpi_ev_match_pci_root_bridge(hid.value)) {
return (TRUE);
}
/*
* The _HID did not match.
* Get the _CID and check for a PCI Root Bridge
*/
status = acpi_ut_execute_CID(node, &cid);
if (ACPI_FAILURE(status)) {
return (FALSE);
}
/* Check all _CIDs in the returned list */
for (i = 0; i < cid->count; i++) {
if (acpi_ev_match_pci_root_bridge(cid->id[i].value)) {
ACPI_FREE(cid);
return (TRUE);
}
}
ACPI_FREE(cid);
return (FALSE);
}
/******************************************************************************
*
* FUNCTION: acpi_get_object_info
*
* PARAMETERS: Handle - Object Handle
* Buffer - Where the info is returned
*
* RETURN: Status
*
* DESCRIPTION: Returns information about an object as gleaned from the
* namespace node and possibly by running several standard
* control methods (Such as in the case of a device.)
*
******************************************************************************/
acpi_status
acpi_get_object_info(acpi_handle handle, struct acpi_buffer * buffer)
{
acpi_status status;
struct acpi_namespace_node *node;
struct acpi_device_info *info;
struct acpi_device_info *return_info;
struct acpi_compatible_id_list *cid_list = NULL;
acpi_size size;
/* Parameter validation */
if (!handle || !buffer) {
return (AE_BAD_PARAMETER);
}
status = acpi_ut_validate_buffer(buffer);
if (ACPI_FAILURE(status)) {
return (status);
}
info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_device_info));
if (!info) {
return (AE_NO_MEMORY);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
node = acpi_ns_map_handle_to_node(handle);
if (!node) {
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
status = AE_BAD_PARAMETER;
goto cleanup;
}
/* Init return structure */
size = sizeof(struct acpi_device_info);
info->type = node->type;
info->name = node->name.integer;
info->valid = 0;
if (node->type == ACPI_TYPE_METHOD) {
info->param_count = node->object->method.param_count;
}
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
/* If not a device, we are all done */
if (info->type == ACPI_TYPE_DEVICE) {
/*
* Get extra info for ACPI Devices objects only:
* Run the Device _HID, _UID, _CID, _STA, _ADR and _sx_d methods.
*
* Note: none of these methods are required, so they may or may
* not be present for this device. The Info->Valid bitfield is used
* to indicate which methods were found and ran successfully.
*/
/* Execute the Device._HID method */
status = acpi_ut_execute_HID(node, &info->hardware_id);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_HID;
}
/* Execute the Device._UID method */
status = acpi_ut_execute_UID(node, &info->unique_id);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_UID;
}
/* Execute the Device._CID method */
status = acpi_ut_execute_CID(node, &cid_list);
if (ACPI_SUCCESS(status)) {
size += cid_list->size;
info->valid |= ACPI_VALID_CID;
}
/* Execute the Device._STA method */
status = acpi_ut_execute_STA(node, &info->current_status);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_STA;
}
/* Execute the Device._ADR method */
status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
&info->address);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_ADR;
}
/* Execute the Device._sx_d methods */
status = acpi_ut_execute_sxds(node, info->highest_dstates);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_SXDS;
}
}
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer(buffer, size);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
/* Populate the return buffer */
return_info = buffer->pointer;
ACPI_MEMCPY(return_info, info, sizeof(struct acpi_device_info));
if (cid_list) {
ACPI_MEMCPY(&return_info->compatibility_id, cid_list,
cid_list->size);
}
cleanup:
ACPI_FREE(info);
if (cid_list) {
ACPI_FREE(cid_list);
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_device_callback
*
* PARAMETERS: Callback from acpi_get_device
*
* RETURN: Status
*
* DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
* present devices, or if they specified a HID, it filters based
* on that.
*
******************************************************************************/
static acpi_status
acpi_ns_get_device_callback(acpi_handle obj_handle,
u32 nesting_level,
void *context, void **return_value)
{
struct acpi_get_devices_info *info = context;
acpi_status status;
struct acpi_namespace_node *node;
u32 flags;
struct acpi_pnp_device_id *hid;
struct acpi_pnp_device_id_list *cid;
u32 i;
u8 found;
int no_match;
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
node = acpi_ns_validate_handle(obj_handle);
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
if (!node) {
return (AE_BAD_PARAMETER);
}
/*
* First, filter based on the device HID and CID.
*
* 01/2010: For this case where a specific HID is requested, we don't
* want to run _STA until we have an actual HID match. Thus, we will
* not unnecessarily execute _STA on devices for which the caller
* doesn't care about. Previously, _STA was executed unconditionally
* on all devices found here.
*
* A side-effect of this change is that now we will continue to search
* for a matching HID even under device trees where the parent device
* would have returned a _STA that indicates it is not present or
* not functioning (thus aborting the search on that branch).
*/
if (info->hid != NULL) {
status = acpi_ut_execute_HID(node, &hid);
if (status == AE_NOT_FOUND) {
return (AE_OK);
} else if (ACPI_FAILURE(status)) {
return (AE_CTRL_DEPTH);
}
no_match = ACPI_STRCMP(hid->string, info->hid);
ACPI_FREE(hid);
if (no_match) {
/*
* HID does not match, attempt match within the
* list of Compatible IDs (CIDs)
*/
status = acpi_ut_execute_CID(node, &cid);
if (status == AE_NOT_FOUND) {
return (AE_OK);
} else if (ACPI_FAILURE(status)) {
return (AE_CTRL_DEPTH);
}
/* Walk the CID list */
found = FALSE;
for (i = 0; i < cid->count; i++) {
if (ACPI_STRCMP(cid->ids[i].string, info->hid)
== 0) {
/* Found a matching CID */
found = TRUE;
break;
}
}
ACPI_FREE(cid);
if (!found) {
return (AE_OK);
}
}
}
/* Run _STA to determine if device is present */
status = acpi_ut_execute_STA(node, &flags);
if (ACPI_FAILURE(status)) {
return (AE_CTRL_DEPTH);
}
if (!(flags & ACPI_STA_DEVICE_PRESENT) &&
!(flags & ACPI_STA_DEVICE_FUNCTIONING)) {
/*
* Don't examine the children of the device only when the
* device is neither present nor functional. See ACPI spec,
* description of _STA for more information.
*/
return (AE_CTRL_DEPTH);
}
/* We have a valid device, invoke the user function */
status = info->user_function(obj_handle, nesting_level, info->context,
return_value);
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_device_callback
*
* PARAMETERS: Callback from acpi_get_device
*
* RETURN: Status
*
* DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
* present devices, or if they specified a HID, it filters based
* on that.
*
******************************************************************************/
static acpi_status
acpi_ns_get_device_callback(acpi_handle obj_handle,
u32 nesting_level,
void *context, void **return_value)
{
struct acpi_get_devices_info *info = context;
acpi_status status;
struct acpi_namespace_node *node;
u32 flags;
struct acpica_device_id hid;
struct acpi_compatible_id_list *cid;
acpi_native_uint i;
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
node = acpi_ns_map_handle_to_node(obj_handle);
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
if (!node) {
return (AE_BAD_PARAMETER);
}
/* Run _STA to determine if device is present */
status = acpi_ut_execute_STA(node, &flags);
if (ACPI_FAILURE(status)) {
return (AE_CTRL_DEPTH);
}
if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
/* Don't examine children of the device if not present */
return (AE_CTRL_DEPTH);
}
/* Filter based on device HID & CID */
if (info->hid != NULL) {
status = acpi_ut_execute_HID(node, &hid);
if (status == AE_NOT_FOUND) {
return (AE_OK);
} else if (ACPI_FAILURE(status)) {
return (AE_CTRL_DEPTH);
}
if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) {
/* Get the list of Compatible IDs */
status = acpi_ut_execute_CID(node, &cid);
if (status == AE_NOT_FOUND) {
return (AE_OK);
} else if (ACPI_FAILURE(status)) {
return (AE_CTRL_DEPTH);
}
/* Walk the CID list */
for (i = 0; i < cid->count; i++) {
if (ACPI_STRNCMP(cid->id[i].value, info->hid,
sizeof(struct
acpi_compatible_id)) !=
0) {
ACPI_FREE(cid);
return (AE_OK);
}
}
ACPI_FREE(cid);
}
}
status = info->user_function(obj_handle, nesting_level, info->context,
return_value);
return (status);
}
acpi_status
acpi_get_object_info(acpi_handle handle,
struct acpi_device_info **return_buffer)
{
struct acpi_namespace_node *node;
struct acpi_device_info *info;
struct acpi_pnp_device_id_list *cid_list = NULL;
struct acpi_pnp_device_id *hid = NULL;
struct acpi_pnp_device_id *uid = NULL;
struct acpi_pnp_device_id *sub = NULL;
struct acpi_pnp_device_id *cls = NULL;
char *next_id_string;
acpi_object_type type;
acpi_name name;
u8 param_count = 0;
u16 valid = 0;
u32 info_size;
u32 i;
acpi_status status;
/* Parameter validation */
if (!handle || !return_buffer) {
return (AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
node = acpi_ns_validate_handle(handle);
if (!node) {
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (AE_BAD_PARAMETER);
}
/* Get the namespace node data while the namespace is locked */
info_size = sizeof(struct acpi_device_info);
type = node->type;
name = node->name.integer;
if (node->type == ACPI_TYPE_METHOD) {
param_count = node->object->method.param_count;
}
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
/*
* Get extra info for ACPI Device/Processor objects only:
* Run the Device _HID, _UID, _SUB, _CID, and _CLS methods.
*
* Note: none of these methods are required, so they may or may
* not be present for this device. The Info->Valid bitfield is used
* to indicate which methods were found and run successfully.
*/
/* Execute the Device._HID method */
status = acpi_ut_execute_HID(node, &hid);
if (ACPI_SUCCESS(status)) {
info_size += hid->length;
valid |= ACPI_VALID_HID;
}
/* Execute the Device._UID method */
status = acpi_ut_execute_UID(node, &uid);
if (ACPI_SUCCESS(status)) {
info_size += uid->length;
valid |= ACPI_VALID_UID;
}
/* Execute the Device._SUB method */
status = acpi_ut_execute_SUB(node, &sub);
if (ACPI_SUCCESS(status)) {
info_size += sub->length;
valid |= ACPI_VALID_SUB;
}
/* Execute the Device._CID method */
status = acpi_ut_execute_CID(node, &cid_list);
if (ACPI_SUCCESS(status)) {
/* Add size of CID strings and CID pointer array */
info_size +=
(cid_list->list_size -
sizeof(struct acpi_pnp_device_id_list));
valid |= ACPI_VALID_CID;
}
/* Execute the Device._CLS method */
status = acpi_ut_execute_CLS(node, &cls);
if (ACPI_SUCCESS(status)) {
info_size += cls->length;
valid |= ACPI_VALID_CLS;
}
}
/*
* Now that we have the variable-length data, we can allocate the
* return buffer
*/
info = ACPI_ALLOCATE_ZEROED(info_size);
if (!info) {
status = AE_NO_MEMORY;
goto cleanup;
}
/* Get the fixed-length data */
if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
/*
* Get extra info for ACPI Device/Processor objects only:
* Run the _STA, _ADR and, sx_w, and _sx_d methods.
*
* Notes: none of these methods are required, so they may or may
* not be present for this device. The Info->Valid bitfield is used
* to indicate which methods were found and run successfully.
*
* For _STA, if the method does not exist, then (as per the ACPI
* specification), the returned current_status flags will indicate
* that the device is present/functional/enabled. Otherwise, the
* current_status flags reflect the value returned from _STA.
*/
/* Execute the Device._STA method */
status = acpi_ut_execute_STA(node, &info->current_status);
if (ACPI_SUCCESS(status)) {
valid |= ACPI_VALID_STA;
}
/* Execute the Device._ADR method */
status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
&info->address);
if (ACPI_SUCCESS(status)) {
valid |= ACPI_VALID_ADR;
}
/* Execute the Device._sx_w methods */
status = acpi_ut_execute_power_methods(node,
acpi_gbl_lowest_dstate_names,
ACPI_NUM_sx_w_METHODS,
info->lowest_dstates);
if (ACPI_SUCCESS(status)) {
valid |= ACPI_VALID_SXWS;
}
/* Execute the Device._sx_d methods */
status = acpi_ut_execute_power_methods(node,
acpi_gbl_highest_dstate_names,
ACPI_NUM_sx_d_METHODS,
info->highest_dstates);
if (ACPI_SUCCESS(status)) {
valid |= ACPI_VALID_SXDS;
}
}
/*
* Create a pointer to the string area of the return buffer.
* Point to the end of the base struct acpi_device_info structure.
*/
next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
if (cid_list) {
/* Point past the CID PNP_DEVICE_ID array */
next_id_string +=
((acpi_size) cid_list->count *
sizeof(struct acpi_pnp_device_id));
}
/*
* Copy the HID, UID, SUB, and CIDs to the return buffer.
* The variable-length strings are copied to the reserved area
* at the end of the buffer.
*
* For HID and CID, check if the ID is a PCI Root Bridge.
*/
if (hid) {
next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
hid, next_id_string);
if (acpi_ut_is_pci_root_bridge(hid->string)) {
info->flags |= ACPI_PCI_ROOT_BRIDGE;
}
}
if (uid) {
next_id_string = acpi_ns_copy_device_id(&info->unique_id,
uid, next_id_string);
}
if (sub) {
next_id_string = acpi_ns_copy_device_id(&info->subsystem_id,
sub, next_id_string);
}
if (cid_list) {
info->compatible_id_list.count = cid_list->count;
info->compatible_id_list.list_size = cid_list->list_size;
/* Copy each CID */
for (i = 0; i < cid_list->count; i++) {
next_id_string =
acpi_ns_copy_device_id(&info->compatible_id_list.
ids[i], &cid_list->ids[i],
next_id_string);
if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
info->flags |= ACPI_PCI_ROOT_BRIDGE;
}
}
}
if (cls) {
next_id_string = acpi_ns_copy_device_id(&info->class_code,
cls, next_id_string);
}
/* Copy the fixed-length data */
info->info_size = info_size;
info->type = type;
info->name = name;
info->param_count = param_count;
info->valid = valid;
*return_buffer = info;
status = AE_OK;
cleanup:
if (hid) {
ACPI_FREE(hid);
}
if (uid) {
ACPI_FREE(uid);
}
if (sub) {
ACPI_FREE(sub);
}
if (cid_list) {
ACPI_FREE(cid_list);
}
if (cls) {
ACPI_FREE(cls);
}
return (status);
}