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/******************************************************************************

 *

 * Module Name: evregion - Operation Region support

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2015, Intel Corp.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#include 

#include "accommon.h"

#include "acevents.h"

#include "acnamesp.h"

#include "acinterp.h"

#define _COMPONENT          ACPI_EVENTS

ACPI_MODULE_NAME("evregion")

extern u8 acpi_gbl_default_address_spaces[];

/* Local prototypes */

static void

acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node);

static acpi_status

acpi_ev_reg_run(acpi_handle obj_handle,

		u32 level, void *context, void **return_value);

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_initialize_op_regions

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Execute _REG methods for all Operation Regions that have

 *              an installed default region handler.

 *

 ******************************************************************************/

acpi_status acpi_ev_initialize_op_regions(void)

{

	acpi_status status;

	u32 i;

	ACPI_FUNCTION_TRACE(ev_initialize_op_regions);

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Run the _REG methods for op_regions in each default address space */

	for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {

		/*

		 * Make sure the installed handler is the DEFAULT handler. If not the

		 * default, the _REG methods will have already been run (when the

		 * handler was installed)

		 */

		if (acpi_ev_has_default_handler(acpi_gbl_root_node,

						acpi_gbl_default_address_spaces

						[i])) {

			status =

			    acpi_ev_execute_reg_methods(acpi_gbl_root_node,

							acpi_gbl_default_address_spaces

							[i]);

		}

	}

	acpi_gbl_reg_methods_executed = TRUE;

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_address_space_dispatch

 *

 * PARAMETERS:  region_obj          - Internal region object

 *              field_obj           - Corresponding field. Can be NULL.

 *              function            - Read or Write operation

 *              region_offset       - Where in the region to read or write

 *              bit_width           - Field width in bits (8, 16, 32, or 64)

 *              value               - Pointer to in or out value, must be

 *                                    a full 64-bit integer

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Dispatch an address space or operation region access to

 *              a previously installed handler.

 *

 ******************************************************************************/

acpi_status

acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,

			       union acpi_operand_object *field_obj,

			       u32 function,

			       u32 region_offset, u32 bit_width, u64 *value)

{

	acpi_status status;

	acpi_adr_space_handler handler;

	acpi_adr_space_setup region_setup;

	union acpi_operand_object *handler_desc;

	union acpi_operand_object *region_obj2;

	void *region_context = NULL;

	struct acpi_connection_info *context;

	acpi_physical_address address;

	ACPI_FUNCTION_TRACE(ev_address_space_dispatch);

	region_obj2 = acpi_ns_get_secondary_object(region_obj);

	if (!region_obj2) {

		return_ACPI_STATUS(AE_NOT_EXIST);

	}

	/* Ensure that there is a handler associated with this region */

	handler_desc = region_obj->region.handler;

	if (!handler_desc) {

		ACPI_ERROR((AE_INFO,

			    "No handler for Region [%4.4s] (%p) [%s]",

			    acpi_ut_get_node_name(region_obj->region.node),

			    region_obj,

			    acpi_ut_get_region_name(region_obj->region.

						    space_id)));

		return_ACPI_STATUS(AE_NOT_EXIST);

	}

	context = handler_desc->address_space.context;

	/*

	 * It may be the case that the region has never been initialized.

	 * Some types of regions require special init code

	 */

	if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {

		/* This region has not been initialized yet, do it */

		region_setup = handler_desc->address_space.setup;

		if (!region_setup) {

			/* No initialization routine, exit with error */

			ACPI_ERROR((AE_INFO,

				    "No init routine for region(%p) [%s]",

				    region_obj,

				    acpi_ut_get_region_name(region_obj->region.

							    space_id)));

			return_ACPI_STATUS(AE_NOT_EXIST);

		}

		/*

		 * We must exit the interpreter because the region setup will

		 * potentially execute control methods (for example, the _REG method

		 * for this region)

		 */

		acpi_ex_exit_interpreter();

		status = region_setup(region_obj, ACPI_REGION_ACTIVATE,

				      context, ®ion_context);

		/* Re-enter the interpreter */

		acpi_ex_enter_interpreter();

		/* Check for failure of the Region Setup */

		if (ACPI_FAILURE(status)) {

			ACPI_EXCEPTION((AE_INFO, status,

					"During region initialization: [%s]",

					acpi_ut_get_region_name(region_obj->

								region.

								space_id)));

			return_ACPI_STATUS(status);

		}

		/* Region initialization may have been completed by region_setup */

		if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {

			region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;

			/*

			 * Save the returned context for use in all accesses to

			 * the handler for this particular region

			 */

			if (!(region_obj2->extra.region_context)) {

				region_obj2->extra.region_context =

				    region_context;

			}

		}

	}

	/* We have everything we need, we can invoke the address space handler */

	handler = handler_desc->address_space.handler;

	address = (region_obj->region.address + region_offset);

	/*

	 * Special handling for generic_serial_bus and general_purpose_io:

	 * There are three extra parameters that must be passed to the

	 * handler via the context:

	 *   1) Connection buffer, a resource template from Connection() op

	 *   2) Length of the above buffer

	 *   3) Actual access length from the access_as() op

	 *

	 * In addition, for general_purpose_io, the Address and bit_width fields

	 * are defined as follows:

	 *   1) Address is the pin number index of the field (bit offset from

	 *      the previous Connection)

	 *   2) bit_width is the actual bit length of the field (number of pins)

	 */

	if ((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS) &&

	    context && field_obj) {

		/* Get the Connection (resource_template) buffer */

		context->connection = field_obj->field.resource_buffer;

		context->length = field_obj->field.resource_length;

		context->access_length = field_obj->field.access_length;

	}

	if ((region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) &&

	    context && field_obj) {

		/* Get the Connection (resource_template) buffer */

		context->connection = field_obj->field.resource_buffer;

		context->length = field_obj->field.resource_length;

		context->access_length = field_obj->field.access_length;

		address = field_obj->field.pin_number_index;

		bit_width = field_obj->field.bit_length;

	}

	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,

			  "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",

			  ®ion_obj->region.handler->address_space, handler,

			  ACPI_FORMAT_UINT64(address),

			  acpi_ut_get_region_name(region_obj->region.

						  space_id)));

	if (!(handler_desc->address_space.handler_flags &

	      ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {

		/*

		 * For handlers other than the default (supplied) handlers, we must

		 * exit the interpreter because the handler *might* block -- we don't

		 * know what it will do, so we can't hold the lock on the intepreter.

		 */

		acpi_ex_exit_interpreter();

	}

	/* Call the handler */

	status = handler(function, address, bit_width, value, context,

			 region_obj2->extra.region_context);

	if (ACPI_FAILURE(status)) {

		ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",

				acpi_ut_get_region_name(region_obj->region.

							space_id)));

	}

	if (!(handler_desc->address_space.handler_flags &

	      ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {

		/*

		 * We just returned from a non-default handler, we must re-enter the

		 * interpreter

		 */

		acpi_ex_enter_interpreter();

	}

	return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_detach_region

 *

 * PARAMETERS:  region_obj          - Region Object

 *              acpi_ns_is_locked   - Namespace Region Already Locked?

 *

 * RETURN:      None

 *

 * DESCRIPTION: Break the association between the handler and the region

 *              this is a two way association.

 *

 ******************************************************************************/

void

acpi_ev_detach_region(union acpi_operand_object *region_obj,

		      u8 acpi_ns_is_locked)

{

	union acpi_operand_object *handler_obj;

	union acpi_operand_object *obj_desc;

	union acpi_operand_object *start_desc;

	union acpi_operand_object **last_obj_ptr;

	acpi_adr_space_setup region_setup;

	void **region_context;

	union acpi_operand_object *region_obj2;

	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_detach_region);

	region_obj2 = acpi_ns_get_secondary_object(region_obj);

	if (!region_obj2) {

		return_VOID;

	}

	region_context = ®ion_obj2->extra.region_context;

	/* Get the address handler from the region object */

	handler_obj = region_obj->region.handler;

	if (!handler_obj) {

		/* This region has no handler, all done */

		return_VOID;

	}

	/* Find this region in the handler's list */

	obj_desc = handler_obj->address_space.region_list;

	start_desc = obj_desc;

	last_obj_ptr = &handler_obj->address_space.region_list;

	while (obj_desc) {

		/* Is this the correct Region? */

		if (obj_desc == region_obj) {

			ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,

					  "Removing Region %p from address handler %p\n",

					  region_obj, handler_obj));

			/* This is it, remove it from the handler's list */

			*last_obj_ptr = obj_desc->region.next;

			obj_desc->region.next = NULL;	/* Must clear field */

			if (acpi_ns_is_locked) {

				status =

				    acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

				if (ACPI_FAILURE(status)) {

					return_VOID;

				}

			}

			/* Now stop region accesses by executing the _REG method */

			status =

			    acpi_ev_execute_reg_method(region_obj,

						       ACPI_REG_DISCONNECT);

			if (ACPI_FAILURE(status)) {

				ACPI_EXCEPTION((AE_INFO, status,

						"from region _REG, [%s]",

						acpi_ut_get_region_name

						(region_obj->region.space_id)));

			}

			if (acpi_ns_is_locked) {

				status =

				    acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);

				if (ACPI_FAILURE(status)) {

					return_VOID;

				}

			}

			/*

			 * If the region has been activated, call the setup handler with

			 * the deactivate notification

			 */

			if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {

				region_setup = handler_obj->address_space.setup;

				status =

				    region_setup(region_obj,

						 ACPI_REGION_DEACTIVATE,

						 handler_obj->address_space.

						 context, region_context);

				/*

				 * region_context should have been released by the deactivate

				 * operation. We don't need access to it anymore here.

				 */

				if (region_context) {

					*region_context = NULL;

				}

				/* Init routine may fail, Just ignore errors */

				if (ACPI_FAILURE(status)) {

					ACPI_EXCEPTION((AE_INFO, status,

							"from region handler - deactivate, [%s]",

							acpi_ut_get_region_name

							(region_obj->region.

							 space_id)));

				}

				region_obj->region.flags &=

				    ~(AOPOBJ_SETUP_COMPLETE);

			}

			/*

			 * Remove handler reference in the region

			 *

			 * NOTE: this doesn't mean that the region goes away, the region

			 * is just inaccessible as indicated to the _REG method

			 *

			 * If the region is on the handler's list, this must be the

			 * region's handler

			 */

			region_obj->region.handler = NULL;

			acpi_ut_remove_reference(handler_obj);

			return_VOID;

		}

		/* Walk the linked list of handlers */

		last_obj_ptr = &obj_desc->region.next;

		obj_desc = obj_desc->region.next;

		/* Prevent infinite loop if list is corrupted */

		if (obj_desc == start_desc) {

			ACPI_ERROR((AE_INFO,

				    "Circular handler list in region object %p",

				    region_obj));

			return_VOID;

		}

	}

	/* If we get here, the region was not in the handler's region list */

	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,

			  "Cannot remove region %p from address handler %p\n",

			  region_obj, handler_obj));

	return_VOID;

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_attach_region

 *

 * PARAMETERS:  handler_obj         - Handler Object

 *              region_obj          - Region Object

 *              acpi_ns_is_locked   - Namespace Region Already Locked?

 *

 * RETURN:      None

 *

 * DESCRIPTION: Create the association between the handler and the region

 *              this is a two way association.

 *

 ******************************************************************************/

acpi_status

acpi_ev_attach_region(union acpi_operand_object *handler_obj,

		      union acpi_operand_object *region_obj,

		      u8 acpi_ns_is_locked)

{

	ACPI_FUNCTION_TRACE(ev_attach_region);

	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,

			  "Adding Region [%4.4s] %p to address handler %p [%s]\n",

			  acpi_ut_get_node_name(region_obj->region.node),

			  region_obj, handler_obj,

			  acpi_ut_get_region_name(region_obj->region.

						  space_id)));

	/* Link this region to the front of the handler's list */

	region_obj->region.next = handler_obj->address_space.region_list;

	handler_obj->address_space.region_list = region_obj;

	/* Install the region's handler */

	if (region_obj->region.handler) {

		return_ACPI_STATUS(AE_ALREADY_EXISTS);

	}

	region_obj->region.handler = handler_obj;

	acpi_ut_add_reference(handler_obj);

	return_ACPI_STATUS(AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_execute_reg_method

 *

 * PARAMETERS:  region_obj          - Region object

 *              function            - Passed to _REG: On (1) or Off (0)

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Execute _REG method for a region

 *

 ******************************************************************************/

acpi_status

acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)

{

	struct acpi_evaluate_info *info;

	union acpi_operand_object *args[3];

	union acpi_operand_object *region_obj2;

	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_execute_reg_method);

	region_obj2 = acpi_ns_get_secondary_object(region_obj);

	if (!region_obj2) {

		return_ACPI_STATUS(AE_NOT_EXIST);

	}

	if (region_obj2->extra.method_REG == NULL) {

		return_ACPI_STATUS(AE_OK);

	}

	/* Allocate and initialize the evaluation information block */

	info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));

	if (!info) {

		return_ACPI_STATUS(AE_NO_MEMORY);

	}

	info->prefix_node = region_obj2->extra.method_REG;

	info->relative_pathname = NULL;

	info->parameters = args;

	info->flags = ACPI_IGNORE_RETURN_VALUE;

	/*

	 * The _REG method has two arguments:

	 *

	 * arg0 - Integer:

	 *  Operation region space ID Same value as region_obj->Region.space_id

	 *

	 * arg1 - Integer:

	 *  connection status 1 for connecting the handler, 0 for disconnecting

	 *  the handler (Passed as a parameter)

	 */

	args[0] =

	    acpi_ut_create_integer_object((u64)region_obj->region.space_id);

	if (!args[0]) {

		status = AE_NO_MEMORY;

		goto cleanup1;

	}

	args[1] = acpi_ut_create_integer_object((u64)function);

	if (!args[1]) {

		status = AE_NO_MEMORY;

		goto cleanup2;

	}

	args[2] = NULL;		/* Terminate list */

	/* Execute the method, no return value */

	ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname

			(ACPI_TYPE_METHOD, info->prefix_node, NULL));

	status = acpi_ns_evaluate(info);

	acpi_ut_remove_reference(args[1]);

cleanup2:

	acpi_ut_remove_reference(args[0]);

cleanup1:

	ACPI_FREE(info);

	return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_execute_reg_methods

 *

 * PARAMETERS:  node            - Namespace node for the device

 *              space_id        - The address space ID

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Run all _REG methods for the input Space ID;

 *              Note: assumes namespace is locked, or system init time.

 *

 ******************************************************************************/

acpi_status

acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,

			    acpi_adr_space_type space_id)

{

	acpi_status status;

	struct acpi_reg_walk_info info;

	ACPI_FUNCTION_TRACE(ev_execute_reg_methods);

	info.space_id = space_id;

	info.reg_run_count = 0;

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES,

			      "    Running _REG methods for SpaceId %s\n",

			      acpi_ut_get_region_name(info.space_id)));

	/*

	 * Run all _REG methods for all Operation Regions for this space ID. This

	 * is a separate walk in order to handle any interdependencies between

	 * regions and _REG methods. (i.e. handlers must be installed for all

	 * regions of this Space ID before we can run any _REG methods)

	 */

	status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,

					ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,

					NULL, &info, NULL);

	/* Special case for EC: handle "orphan" _REG methods with no region */

	if (space_id == ACPI_ADR_SPACE_EC) {

		acpi_ev_orphan_ec_reg_method(node);

	}

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES,

			      "    Executed %u _REG methods for SpaceId %s\n",

			      info.reg_run_count,

			      acpi_ut_get_region_name(info.space_id)));

	return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_reg_run

 *

 * PARAMETERS:  walk_namespace callback

 *

 * DESCRIPTION: Run _REG method for region objects of the requested spaceID

 *

 ******************************************************************************/

static acpi_status

acpi_ev_reg_run(acpi_handle obj_handle,

		u32 level, void *context, void **return_value)

{

	union acpi_operand_object *obj_desc;

	struct acpi_namespace_node *node;

	acpi_status status;

	struct acpi_reg_walk_info *info;

	info = ACPI_CAST_PTR(struct acpi_reg_walk_info, context);

	/* Convert and validate the device handle */

	node = acpi_ns_validate_handle(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_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);

	}

	/* Object is a Region */

	if (obj_desc->region.space_id != info->space_id) {

		/* This region is for a different address space, just ignore it */

		return (AE_OK);

	}

	info->reg_run_count++;

	status = acpi_ev_execute_reg_method(obj_desc, ACPI_REG_CONNECT);

	return (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_orphan_ec_reg_method

 *

 * PARAMETERS:  ec_device_node      - Namespace node for an EC device

 *

 * RETURN:      None

 *

 * DESCRIPTION: Execute an "orphan" _REG method that appears under the EC

 *              device. This is a _REG method that has no corresponding region

 *              within the EC device scope. The orphan _REG method appears to

 *              have been enabled by the description of the ECDT in the ACPI

 *              specification: "The availability of the region space can be

 *              detected by providing a _REG method object underneath the

 *              Embedded Controller device."

 *

 *              To quickly access the EC device, we use the ec_device_node used

 *              during EC handler installation. Otherwise, we would need to

 *              perform a time consuming namespace walk, executing _HID

 *              methods to find the EC device.

 *

 *  MUTEX:      Assumes the namespace is locked

 *

 ******************************************************************************/

static void

acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node)

{

	acpi_handle reg_method;

	struct acpi_namespace_node *next_node;

	acpi_status status;

	struct acpi_object_list args;

	union acpi_object objects[2];

	ACPI_FUNCTION_TRACE(ev_orphan_ec_reg_method);

	if (!ec_device_node) {

		return_VOID;

	}

	/* Namespace is currently locked, must release */

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	/* Get a handle to a _REG method immediately under the EC device */

	status = acpi_get_handle(ec_device_node, METHOD_NAME__REG, ®_method);

	if (ACPI_FAILURE(status)) {

		goto exit;	/* There is no _REG method present */

	}

	/*

	 * Execute the _REG method only if there is no Operation Region in

	 * this scope with the Embedded Controller space ID. Otherwise, it

	 * will already have been executed. Note, this allows for Regions

	 * with other space IDs to be present; but the code below will then

	 * execute the _REG method with the embedded_control space_ID argument.

	 */

	next_node = acpi_ns_get_next_node(ec_device_node, NULL);

	while (next_node) {

		if ((next_node->type == ACPI_TYPE_REGION) &&

		    (next_node->object) &&

		    (next_node->object->region.space_id == ACPI_ADR_SPACE_EC)) {

			goto exit;	/* Do not execute the _REG */

		}

		next_node = acpi_ns_get_next_node(ec_device_node, next_node);

	}

	/* Evaluate the _REG(embedded_control,Connect) method */

	args.count = 2;

	args.pointer = objects;

	objects[0].type = ACPI_TYPE_INTEGER;

	objects[0].integer.value = ACPI_ADR_SPACE_EC;

	objects[1].type = ACPI_TYPE_INTEGER;

	objects[1].integer.value = ACPI_REG_CONNECT;

	status = acpi_evaluate_object(reg_method, NULL, &args, NULL);

exit:

	/* We ignore all errors from above, don't care */

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);

	return_VOID;

}