static acpi_status
acpi_ev_install_handler(acpi_handle obj_handle,
u32 level, void *context, void **return_value)
{
union acpi_operand_object *handler_obj;
union acpi_operand_object *next_handler_obj;
union acpi_operand_object *obj_desc;
struct acpi_namespace_node *node;
acpi_status status;
ACPI_FUNCTION_NAME(ev_install_handler);
handler_obj = (union acpi_operand_object *)context;
/* Parameter validation */
if (!handler_obj) {
return (AE_OK);
}
/* Convert and validate the device handle */
node = acpi_ns_map_handle_to_node(obj_handle);
if (!node) {
return (AE_BAD_PARAMETER);
}
/*
* We only care about regions.and objects
* that are allowed to have address space handlers
*/
if ((node->type != ACPI_TYPE_DEVICE) &&
(node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
return (AE_OK);
}
/* Check for an existing internal object */
obj_desc = acpi_ns_get_attached_object(node);
if (!obj_desc) {
/* No object, just exit */
return (AE_OK);
}
/* Devices are handled different than regions */
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_DEVICE) {
/* Check if this Device already has a handler for this address space */
next_handler_obj = obj_desc->device.handler;
while (next_handler_obj) {
/* Found a handler, is it for the same address space? */
if (next_handler_obj->address_space.space_id ==
handler_obj->address_space.space_id) {
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
"Found handler for region [%s] in device %p(%p) handler %p\n",
acpi_ut_get_region_name
(handler_obj->address_space.
space_id), obj_desc,
next_handler_obj,
handler_obj));
/*
* Since the object we found it on was a device, then it
* means that someone has already installed a handler for
* the branch of the namespace from this device on. Just
* bail out telling the walk routine to not traverse this
* branch. This preserves the scoping rule for handlers.
*/
return (AE_CTRL_DEPTH);
}
/* Walk the linked list of handlers attached to this device */
next_handler_obj = next_handler_obj->address_space.next;
}
/*
* As long as the device didn't have a handler for this
* space we don't care about it. We just ignore it and
* proceed.
*/
return (AE_OK);
}
/* Object is a Region */
if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
/*
* This region is for a different address space
* -- just ignore it
*/
return (AE_OK);
}
/*
* Now we have a region and it is for the handler's address
* space type.
*
* First disconnect region for any previous handler (if any)
*/
acpi_ev_detach_region(obj_desc, FALSE);
/* Connect the region to the new handler */
status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
return (status);
}
acpi_status
acpi_ev_initialize_region(union acpi_operand_object *region_obj,
u8 acpi_ns_locked)
{
union acpi_operand_object *handler_obj;
union acpi_operand_object *obj_desc;
acpi_adr_space_type space_id;
struct acpi_namespace_node *node;
acpi_status status;
struct acpi_namespace_node *method_node;
acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
union acpi_operand_object *region_obj2;
ACPI_FUNCTION_TRACE_U32(ev_initialize_region, acpi_ns_locked);
if (!region_obj) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
return_ACPI_STATUS(AE_OK);
}
region_obj2 = acpi_ns_get_secondary_object(region_obj);
if (!region_obj2) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
node = acpi_ns_get_parent_node(region_obj->region.node);
space_id = region_obj->region.space_id;
/* Setup defaults */
region_obj->region.handler = NULL;
region_obj2->extra.method_REG = NULL;
region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
/* Find any "_REG" method associated with this region definition */
status =
acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
&method_node);
if (ACPI_SUCCESS(status)) {
/*
* The _REG method is optional and there can be only one per region
* definition. This will be executed when the handler is attached
* or removed
*/
region_obj2->extra.method_REG = method_node;
}
/*
* The following loop depends upon the root Node having no parent
* ie: acpi_gbl_root_node->parent_entry being set to NULL
*/
while (node) {
/* Check to see if a handler exists */
handler_obj = NULL;
obj_desc = acpi_ns_get_attached_object(node);
if (obj_desc) {
/* Can only be a handler if the object exists */
switch (node->type) {
case ACPI_TYPE_DEVICE:
handler_obj = obj_desc->device.handler;
break;
case ACPI_TYPE_PROCESSOR:
handler_obj = obj_desc->processor.handler;
break;
case ACPI_TYPE_THERMAL:
handler_obj = obj_desc->thermal_zone.handler;
break;
default:
/* Ignore other objects */
break;
}
while (handler_obj) {
/* Is this handler of the correct type? */
if (handler_obj->address_space.space_id ==
space_id) {
/* Found correct handler */
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
"Found handler %p for region %p in obj %p\n",
handler_obj,
region_obj,
obj_desc));
status =
acpi_ev_attach_region(handler_obj,
region_obj,
acpi_ns_locked);
/*
* Tell all users that this region is usable by running the _REG
* method
*/
if (acpi_ns_locked) {
status =
acpi_ut_release_mutex
(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS
(status);
}
}
status =
acpi_ev_execute_reg_method
(region_obj, 1);
if (acpi_ns_locked) {
status =
acpi_ut_acquire_mutex
(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS
(status);
}
}
return_ACPI_STATUS(AE_OK);
}
/* Try next handler in the list */
handler_obj = handler_obj->address_space.next;
}
}
/*
* This node does not have the handler we need;
* Pop up one level
*/
node = acpi_ns_get_parent_node(node);
}
/* If we get here, there is no handler for this region */
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
"No handler for RegionType %s(%X) (RegionObj %p)\n",
acpi_ut_get_region_name(space_id), space_id,
region_obj));
return_ACPI_STATUS(AE_NOT_EXIST);
}
acpi_status
acpi_ev_initialize_region(union acpi_operand_object *region_obj,
u8 acpi_ns_locked)
{
union acpi_operand_object *handler_obj;
union acpi_operand_object *obj_desc;
acpi_adr_space_type space_id;
struct acpi_namespace_node *node;
acpi_status status;
ACPI_FUNCTION_TRACE_U32(ev_initialize_region, acpi_ns_locked);
if (!region_obj) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
return_ACPI_STATUS(AE_OK);
}
acpi_ev_associate_reg_method(region_obj);
region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
node = region_obj->region.node->parent;
space_id = region_obj->region.space_id;
/*
* The following loop depends upon the root Node having no parent
* ie: acpi_gbl_root_node->Parent being set to NULL
*/
while (node) {
/* Check to see if a handler exists */
handler_obj = NULL;
obj_desc = acpi_ns_get_attached_object(node);
if (obj_desc) {
/* Can only be a handler if the object exists */
switch (node->type) {
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_THERMAL:
handler_obj = obj_desc->common_notify.handler;
break;
case ACPI_TYPE_METHOD:
/*
* If we are executing module level code, the original
* Node's object was replaced by this Method object and we
* saved the handler in the method object.
*
* See acpi_ns_exec_module_code
*/
if (obj_desc->method.
info_flags & ACPI_METHOD_MODULE_LEVEL) {
handler_obj =
obj_desc->method.dispatch.handler;
}
break;
default:
/* Ignore other objects */
break;
}
handler_obj =
acpi_ev_find_region_handler(space_id, handler_obj);
if (handler_obj) {
/* Found correct handler */
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
"Found handler %p for region %p in obj %p\n",
handler_obj, region_obj,
obj_desc));
status =
acpi_ev_attach_region(handler_obj,
region_obj,
acpi_ns_locked);
/*
* Tell all users that this region is usable by
* running the _REG method
*/
if (acpi_ns_locked) {
status =
acpi_ut_release_mutex
(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
status =
acpi_ev_execute_reg_method(region_obj,
ACPI_REG_CONNECT);
if (acpi_ns_locked) {
status =
acpi_ut_acquire_mutex
(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
return_ACPI_STATUS(AE_OK);
}
}
/* This node does not have the handler we need; Pop up one level */
node = node->parent;
}
/* If we get here, there is no handler for this region */
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
"No handler for RegionType %s(%X) (RegionObj %p)\n",
acpi_ut_get_region_name(space_id), space_id,
region_obj));
return_ACPI_STATUS(AE_NOT_EXIST);
}
