1 /******************************************************************************
3 * Module Name: evregion - Operation Region support
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2017, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.h>
50 #define _COMPONENT ACPI_EVENTS
51 ACPI_MODULE_NAME("evregion")
53 extern u8 acpi_gbl_default_address_spaces
[];
55 /* Local prototypes */
58 acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node
*ec_device_node
);
61 acpi_ev_reg_run(acpi_handle obj_handle
,
62 u32 level
, void *context
, void **return_value
);
64 /*******************************************************************************
66 * FUNCTION: acpi_ev_initialize_op_regions
72 * DESCRIPTION: Execute _REG methods for all Operation Regions that have
73 * an installed default region handler.
75 ******************************************************************************/
77 acpi_status
acpi_ev_initialize_op_regions(void)
82 ACPI_FUNCTION_TRACE(ev_initialize_op_regions
);
84 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
85 if (ACPI_FAILURE(status
)) {
86 return_ACPI_STATUS(status
);
89 /* Run the _REG methods for op_regions in each default address space */
91 for (i
= 0; i
< ACPI_NUM_DEFAULT_SPACES
; i
++) {
93 * Make sure the installed handler is the DEFAULT handler. If not the
94 * default, the _REG methods will have already been run (when the
95 * handler was installed)
97 if (acpi_ev_has_default_handler(acpi_gbl_root_node
,
98 acpi_gbl_default_address_spaces
100 acpi_ev_execute_reg_methods(acpi_gbl_root_node
,
101 acpi_gbl_default_address_spaces
102 [i
], ACPI_REG_CONNECT
);
106 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
107 return_ACPI_STATUS(status
);
110 /*******************************************************************************
112 * FUNCTION: acpi_ev_address_space_dispatch
114 * PARAMETERS: region_obj - Internal region object
115 * field_obj - Corresponding field. Can be NULL.
116 * function - Read or Write operation
117 * region_offset - Where in the region to read or write
118 * bit_width - Field width in bits (8, 16, 32, or 64)
119 * value - Pointer to in or out value, must be
120 * a full 64-bit integer
124 * DESCRIPTION: Dispatch an address space or operation region access to
125 * a previously installed handler.
127 * NOTE: During early initialization, we always install the default region
128 * handlers for Memory, I/O and PCI_Config. This ensures that these operation
129 * region address spaces are always available as per the ACPI specification.
130 * This is especially needed in order to support the execution of
131 * module-level AML code during loading of the ACPI tables.
133 ******************************************************************************/
136 acpi_ev_address_space_dispatch(union acpi_operand_object
*region_obj
,
137 union acpi_operand_object
*field_obj
,
139 u32 region_offset
, u32 bit_width
, u64
*value
)
142 acpi_adr_space_handler handler
;
143 acpi_adr_space_setup region_setup
;
144 union acpi_operand_object
*handler_desc
;
145 union acpi_operand_object
*region_obj2
;
146 void *region_context
= NULL
;
147 struct acpi_connection_info
*context
;
148 acpi_physical_address address
;
150 ACPI_FUNCTION_TRACE(ev_address_space_dispatch
);
152 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
154 return_ACPI_STATUS(AE_NOT_EXIST
);
157 /* Ensure that there is a handler associated with this region */
159 handler_desc
= region_obj
->region
.handler
;
162 "No handler for Region [%4.4s] (%p) [%s]",
163 acpi_ut_get_node_name(region_obj
->region
.node
),
165 acpi_ut_get_region_name(region_obj
->region
.
168 return_ACPI_STATUS(AE_NOT_EXIST
);
171 context
= handler_desc
->address_space
.context
;
174 * It may be the case that the region has never been initialized.
175 * Some types of regions require special init code
177 if (!(region_obj
->region
.flags
& AOPOBJ_SETUP_COMPLETE
)) {
179 /* This region has not been initialized yet, do it */
181 region_setup
= handler_desc
->address_space
.setup
;
184 /* No initialization routine, exit with error */
187 "No init routine for region(%p) [%s]",
189 acpi_ut_get_region_name(region_obj
->region
.
191 return_ACPI_STATUS(AE_NOT_EXIST
);
195 * We must exit the interpreter because the region setup will
196 * potentially execute control methods (for example, the _REG method
199 acpi_ex_exit_interpreter();
201 status
= region_setup(region_obj
, ACPI_REGION_ACTIVATE
,
202 context
, ®ion_context
);
204 /* Re-enter the interpreter */
206 acpi_ex_enter_interpreter();
208 /* Check for failure of the Region Setup */
210 if (ACPI_FAILURE(status
)) {
211 ACPI_EXCEPTION((AE_INFO
, status
,
212 "During region initialization: [%s]",
213 acpi_ut_get_region_name(region_obj
->
216 return_ACPI_STATUS(status
);
219 /* Region initialization may have been completed by region_setup */
221 if (!(region_obj
->region
.flags
& AOPOBJ_SETUP_COMPLETE
)) {
222 region_obj
->region
.flags
|= AOPOBJ_SETUP_COMPLETE
;
225 * Save the returned context for use in all accesses to
226 * the handler for this particular region
228 if (!(region_obj2
->extra
.region_context
)) {
229 region_obj2
->extra
.region_context
=
235 /* We have everything we need, we can invoke the address space handler */
237 handler
= handler_desc
->address_space
.handler
;
238 address
= (region_obj
->region
.address
+ region_offset
);
241 * Special handling for generic_serial_bus and general_purpose_io:
242 * There are three extra parameters that must be passed to the
243 * handler via the context:
244 * 1) Connection buffer, a resource template from Connection() op
245 * 2) Length of the above buffer
246 * 3) Actual access length from the access_as() op
248 * In addition, for general_purpose_io, the Address and bit_width fields
249 * are defined as follows:
250 * 1) Address is the pin number index of the field (bit offset from
251 * the previous Connection)
252 * 2) bit_width is the actual bit length of the field (number of pins)
254 if ((region_obj
->region
.space_id
== ACPI_ADR_SPACE_GSBUS
) &&
255 context
&& field_obj
) {
257 /* Get the Connection (resource_template) buffer */
259 context
->connection
= field_obj
->field
.resource_buffer
;
260 context
->length
= field_obj
->field
.resource_length
;
261 context
->access_length
= field_obj
->field
.access_length
;
263 if ((region_obj
->region
.space_id
== ACPI_ADR_SPACE_GPIO
) &&
264 context
&& field_obj
) {
266 /* Get the Connection (resource_template) buffer */
268 context
->connection
= field_obj
->field
.resource_buffer
;
269 context
->length
= field_obj
->field
.resource_length
;
270 context
->access_length
= field_obj
->field
.access_length
;
271 address
= field_obj
->field
.pin_number_index
;
272 bit_width
= field_obj
->field
.bit_length
;
275 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
276 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
277 ®ion_obj
->region
.handler
->address_space
, handler
,
278 ACPI_FORMAT_UINT64(address
),
279 acpi_ut_get_region_name(region_obj
->region
.
282 if (!(handler_desc
->address_space
.handler_flags
&
283 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
)) {
285 * For handlers other than the default (supplied) handlers, we must
286 * exit the interpreter because the handler *might* block -- we don't
287 * know what it will do, so we can't hold the lock on the intepreter.
289 acpi_ex_exit_interpreter();
292 /* Call the handler */
294 status
= handler(function
, address
, bit_width
, value
, context
,
295 region_obj2
->extra
.region_context
);
297 if (ACPI_FAILURE(status
)) {
298 ACPI_EXCEPTION((AE_INFO
, status
, "Returned by Handler for [%s]",
299 acpi_ut_get_region_name(region_obj
->region
.
303 if (!(handler_desc
->address_space
.handler_flags
&
304 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
)) {
306 * We just returned from a non-default handler, we must re-enter the
309 acpi_ex_enter_interpreter();
312 return_ACPI_STATUS(status
);
315 /*******************************************************************************
317 * FUNCTION: acpi_ev_detach_region
319 * PARAMETERS: region_obj - Region Object
320 * acpi_ns_is_locked - Namespace Region Already Locked?
324 * DESCRIPTION: Break the association between the handler and the region
325 * this is a two way association.
327 ******************************************************************************/
330 acpi_ev_detach_region(union acpi_operand_object
*region_obj
,
331 u8 acpi_ns_is_locked
)
333 union acpi_operand_object
*handler_obj
;
334 union acpi_operand_object
*obj_desc
;
335 union acpi_operand_object
*start_desc
;
336 union acpi_operand_object
**last_obj_ptr
;
337 acpi_adr_space_setup region_setup
;
338 void **region_context
;
339 union acpi_operand_object
*region_obj2
;
342 ACPI_FUNCTION_TRACE(ev_detach_region
);
344 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
348 region_context
= ®ion_obj2
->extra
.region_context
;
350 /* Get the address handler from the region object */
352 handler_obj
= region_obj
->region
.handler
;
355 /* This region has no handler, all done */
360 /* Find this region in the handler's list */
362 obj_desc
= handler_obj
->address_space
.region_list
;
363 start_desc
= obj_desc
;
364 last_obj_ptr
= &handler_obj
->address_space
.region_list
;
368 /* Is this the correct Region? */
370 if (obj_desc
== region_obj
) {
371 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
372 "Removing Region %p from address handler %p\n",
373 region_obj
, handler_obj
));
375 /* This is it, remove it from the handler's list */
377 *last_obj_ptr
= obj_desc
->region
.next
;
378 obj_desc
->region
.next
= NULL
; /* Must clear field */
380 if (acpi_ns_is_locked
) {
382 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
383 if (ACPI_FAILURE(status
)) {
388 /* Now stop region accesses by executing the _REG method */
391 acpi_ev_execute_reg_method(region_obj
,
392 ACPI_REG_DISCONNECT
);
393 if (ACPI_FAILURE(status
)) {
394 ACPI_EXCEPTION((AE_INFO
, status
,
395 "from region _REG, [%s]",
396 acpi_ut_get_region_name
397 (region_obj
->region
.space_id
)));
400 if (acpi_ns_is_locked
) {
402 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
403 if (ACPI_FAILURE(status
)) {
409 * If the region has been activated, call the setup handler with
410 * the deactivate notification
412 if (region_obj
->region
.flags
& AOPOBJ_SETUP_COMPLETE
) {
413 region_setup
= handler_obj
->address_space
.setup
;
415 region_setup(region_obj
,
416 ACPI_REGION_DEACTIVATE
,
417 handler_obj
->address_space
.
418 context
, region_context
);
421 * region_context should have been released by the deactivate
422 * operation. We don't need access to it anymore here.
424 if (region_context
) {
425 *region_context
= NULL
;
428 /* Init routine may fail, Just ignore errors */
430 if (ACPI_FAILURE(status
)) {
431 ACPI_EXCEPTION((AE_INFO
, status
,
432 "from region handler - deactivate, [%s]",
433 acpi_ut_get_region_name
438 region_obj
->region
.flags
&=
439 ~(AOPOBJ_SETUP_COMPLETE
);
443 * Remove handler reference in the region
445 * NOTE: this doesn't mean that the region goes away, the region
446 * is just inaccessible as indicated to the _REG method
448 * If the region is on the handler's list, this must be the
451 region_obj
->region
.handler
= NULL
;
452 acpi_ut_remove_reference(handler_obj
);
457 /* Walk the linked list of handlers */
459 last_obj_ptr
= &obj_desc
->region
.next
;
460 obj_desc
= obj_desc
->region
.next
;
462 /* Prevent infinite loop if list is corrupted */
464 if (obj_desc
== start_desc
) {
466 "Circular handler list in region object %p",
472 /* If we get here, the region was not in the handler's region list */
474 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
475 "Cannot remove region %p from address handler %p\n",
476 region_obj
, handler_obj
));
481 /*******************************************************************************
483 * FUNCTION: acpi_ev_attach_region
485 * PARAMETERS: handler_obj - Handler Object
486 * region_obj - Region Object
487 * acpi_ns_is_locked - Namespace Region Already Locked?
491 * DESCRIPTION: Create the association between the handler and the region
492 * this is a two way association.
494 ******************************************************************************/
497 acpi_ev_attach_region(union acpi_operand_object
*handler_obj
,
498 union acpi_operand_object
*region_obj
,
499 u8 acpi_ns_is_locked
)
502 ACPI_FUNCTION_TRACE(ev_attach_region
);
504 /* Install the region's handler */
506 if (region_obj
->region
.handler
) {
507 return_ACPI_STATUS(AE_ALREADY_EXISTS
);
510 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
511 "Adding Region [%4.4s] %p to address handler %p [%s]\n",
512 acpi_ut_get_node_name(region_obj
->region
.node
),
513 region_obj
, handler_obj
,
514 acpi_ut_get_region_name(region_obj
->region
.
517 /* Link this region to the front of the handler's list */
519 region_obj
->region
.next
= handler_obj
->address_space
.region_list
;
520 handler_obj
->address_space
.region_list
= region_obj
;
521 region_obj
->region
.handler
= handler_obj
;
522 acpi_ut_add_reference(handler_obj
);
524 return_ACPI_STATUS(AE_OK
);
527 /*******************************************************************************
529 * FUNCTION: acpi_ev_execute_reg_method
531 * PARAMETERS: region_obj - Region object
532 * function - Passed to _REG: On (1) or Off (0)
536 * DESCRIPTION: Execute _REG method for a region
538 ******************************************************************************/
541 acpi_ev_execute_reg_method(union acpi_operand_object
*region_obj
, u32 function
)
543 struct acpi_evaluate_info
*info
;
544 union acpi_operand_object
*args
[3];
545 union acpi_operand_object
*region_obj2
;
546 const acpi_name
*reg_name_ptr
=
547 ACPI_CAST_PTR(acpi_name
, METHOD_NAME__REG
);
548 struct acpi_namespace_node
*method_node
;
549 struct acpi_namespace_node
*node
;
552 ACPI_FUNCTION_TRACE(ev_execute_reg_method
);
554 if (!acpi_gbl_namespace_initialized
||
555 region_obj
->region
.handler
== NULL
) {
556 return_ACPI_STATUS(AE_OK
);
559 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
561 return_ACPI_STATUS(AE_NOT_EXIST
);
565 * Find any "_REG" method associated with this region definition.
566 * The method should always be updated as this function may be
567 * invoked after a namespace change.
569 node
= region_obj
->region
.node
->parent
;
571 acpi_ns_search_one_scope(*reg_name_ptr
, node
, ACPI_TYPE_METHOD
,
573 if (ACPI_SUCCESS(status
)) {
575 * The _REG method is optional and there can be only one per
576 * region definition. This will be executed when the handler is
577 * attached or removed.
579 region_obj2
->extra
.method_REG
= method_node
;
581 if (region_obj2
->extra
.method_REG
== NULL
) {
582 return_ACPI_STATUS(AE_OK
);
585 /* _REG(DISCONNECT) should be paired with _REG(CONNECT) */
587 if ((function
== ACPI_REG_CONNECT
&&
588 region_obj
->common
.flags
& AOPOBJ_REG_CONNECTED
) ||
589 (function
== ACPI_REG_DISCONNECT
&&
590 !(region_obj
->common
.flags
& AOPOBJ_REG_CONNECTED
))) {
591 return_ACPI_STATUS(AE_OK
);
594 /* Allocate and initialize the evaluation information block */
596 info
= ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info
));
598 return_ACPI_STATUS(AE_NO_MEMORY
);
601 info
->prefix_node
= region_obj2
->extra
.method_REG
;
602 info
->relative_pathname
= NULL
;
603 info
->parameters
= args
;
604 info
->flags
= ACPI_IGNORE_RETURN_VALUE
;
607 * The _REG method has two arguments:
610 * Operation region space ID Same value as region_obj->Region.space_id
613 * connection status 1 for connecting the handler, 0 for disconnecting
614 * the handler (Passed as a parameter)
617 acpi_ut_create_integer_object((u64
)region_obj
->region
.space_id
);
619 status
= AE_NO_MEMORY
;
623 args
[1] = acpi_ut_create_integer_object((u64
)function
);
625 status
= AE_NO_MEMORY
;
629 args
[2] = NULL
; /* Terminate list */
631 /* Execute the method, no return value */
633 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
634 (ACPI_TYPE_METHOD
, info
->prefix_node
, NULL
));
636 status
= acpi_ns_evaluate(info
);
637 acpi_ut_remove_reference(args
[1]);
639 if (ACPI_FAILURE(status
)) {
643 if (function
== ACPI_REG_CONNECT
) {
644 region_obj
->common
.flags
|= AOPOBJ_REG_CONNECTED
;
646 region_obj
->common
.flags
&= ~AOPOBJ_REG_CONNECTED
;
650 acpi_ut_remove_reference(args
[0]);
654 return_ACPI_STATUS(status
);
657 /*******************************************************************************
659 * FUNCTION: acpi_ev_execute_reg_methods
661 * PARAMETERS: node - Namespace node for the device
662 * space_id - The address space ID
663 * function - Passed to _REG: On (1) or Off (0)
667 * DESCRIPTION: Run all _REG methods for the input Space ID;
668 * Note: assumes namespace is locked, or system init time.
670 ******************************************************************************/
673 acpi_ev_execute_reg_methods(struct acpi_namespace_node
*node
,
674 acpi_adr_space_type space_id
, u32 function
)
676 struct acpi_reg_walk_info info
;
678 ACPI_FUNCTION_TRACE(ev_execute_reg_methods
);
681 * These address spaces do not need a call to _REG, since the ACPI
682 * specification defines them as: "must always be accessible". Since
683 * they never change state (never become unavailable), no need to ever
684 * call _REG on them. Also, a data_table is not a "real" address space,
685 * so do not call _REG. September 2018.
687 if ((space_id
== ACPI_ADR_SPACE_SYSTEM_MEMORY
) ||
688 (space_id
== ACPI_ADR_SPACE_SYSTEM_IO
) ||
689 (space_id
== ACPI_ADR_SPACE_DATA_TABLE
)) {
693 info
.space_id
= space_id
;
694 info
.function
= function
;
695 info
.reg_run_count
= 0;
697 ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES
,
698 " Running _REG methods for SpaceId %s\n",
699 acpi_ut_get_region_name(info
.space_id
)));
702 * Run all _REG methods for all Operation Regions for this space ID. This
703 * is a separate walk in order to handle any interdependencies between
704 * regions and _REG methods. (i.e. handlers must be installed for all
705 * regions of this Space ID before we can run any _REG methods)
707 (void)acpi_ns_walk_namespace(ACPI_TYPE_ANY
, node
, ACPI_UINT32_MAX
,
708 ACPI_NS_WALK_UNLOCK
, acpi_ev_reg_run
, NULL
,
711 /* Special case for EC: handle "orphan" _REG methods with no region */
713 if (space_id
== ACPI_ADR_SPACE_EC
) {
714 acpi_ev_orphan_ec_reg_method(node
);
717 ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES
,
718 " Executed %u _REG methods for SpaceId %s\n",
720 acpi_ut_get_region_name(info
.space_id
)));
725 /*******************************************************************************
727 * FUNCTION: acpi_ev_reg_run
729 * PARAMETERS: walk_namespace callback
731 * DESCRIPTION: Run _REG method for region objects of the requested spaceID
733 ******************************************************************************/
736 acpi_ev_reg_run(acpi_handle obj_handle
,
737 u32 level
, void *context
, void **return_value
)
739 union acpi_operand_object
*obj_desc
;
740 struct acpi_namespace_node
*node
;
742 struct acpi_reg_walk_info
*info
;
744 info
= ACPI_CAST_PTR(struct acpi_reg_walk_info
, context
);
746 /* Convert and validate the device handle */
748 node
= acpi_ns_validate_handle(obj_handle
);
750 return (AE_BAD_PARAMETER
);
754 * We only care about regions and objects that are allowed to have
755 * address space handlers
757 if ((node
->type
!= ACPI_TYPE_REGION
) && (node
!= acpi_gbl_root_node
)) {
761 /* Check for an existing internal object */
763 obj_desc
= acpi_ns_get_attached_object(node
);
766 /* No object, just exit */
771 /* Object is a Region */
773 if (obj_desc
->region
.space_id
!= info
->space_id
) {
775 /* This region is for a different address space, just ignore it */
780 info
->reg_run_count
++;
781 status
= acpi_ev_execute_reg_method(obj_desc
, info
->function
);
785 /*******************************************************************************
787 * FUNCTION: acpi_ev_orphan_ec_reg_method
789 * PARAMETERS: ec_device_node - Namespace node for an EC device
793 * DESCRIPTION: Execute an "orphan" _REG method that appears under the EC
794 * device. This is a _REG method that has no corresponding region
795 * within the EC device scope. The orphan _REG method appears to
796 * have been enabled by the description of the ECDT in the ACPI
797 * specification: "The availability of the region space can be
798 * detected by providing a _REG method object underneath the
799 * Embedded Controller device."
801 * To quickly access the EC device, we use the ec_device_node used
802 * during EC handler installation. Otherwise, we would need to
803 * perform a time consuming namespace walk, executing _HID
804 * methods to find the EC device.
806 * MUTEX: Assumes the namespace is locked
808 ******************************************************************************/
811 acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node
*ec_device_node
)
813 acpi_handle reg_method
;
814 struct acpi_namespace_node
*next_node
;
816 struct acpi_object_list args
;
817 union acpi_object objects
[2];
819 ACPI_FUNCTION_TRACE(ev_orphan_ec_reg_method
);
821 if (!ec_device_node
) {
825 /* Namespace is currently locked, must release */
827 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
829 /* Get a handle to a _REG method immediately under the EC device */
831 status
= acpi_get_handle(ec_device_node
, METHOD_NAME__REG
, ®_method
);
832 if (ACPI_FAILURE(status
)) {
833 goto exit
; /* There is no _REG method present */
837 * Execute the _REG method only if there is no Operation Region in
838 * this scope with the Embedded Controller space ID. Otherwise, it
839 * will already have been executed. Note, this allows for Regions
840 * with other space IDs to be present; but the code below will then
841 * execute the _REG method with the embedded_control space_ID argument.
843 next_node
= acpi_ns_get_next_node(ec_device_node
, NULL
);
845 if ((next_node
->type
== ACPI_TYPE_REGION
) &&
846 (next_node
->object
) &&
847 (next_node
->object
->region
.space_id
== ACPI_ADR_SPACE_EC
)) {
848 goto exit
; /* Do not execute the _REG */
851 next_node
= acpi_ns_get_next_node(ec_device_node
, next_node
);
854 /* Evaluate the _REG(embedded_control,Connect) method */
857 args
.pointer
= objects
;
858 objects
[0].type
= ACPI_TYPE_INTEGER
;
859 objects
[0].integer
.value
= ACPI_ADR_SPACE_EC
;
860 objects
[1].type
= ACPI_TYPE_INTEGER
;
861 objects
[1].integer
.value
= ACPI_REG_CONNECT
;
863 status
= acpi_evaluate_object(reg_method
, NULL
, &args
, NULL
);
866 /* We ignore all errors from above, don't care */
868 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);