diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/acpi/acpica/evregion.c | 873 |
1 files changed, 873 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c new file mode 100644 index 000000000..b96b3a7e7 --- /dev/null +++ b/drivers/acpi/acpica/evregion.c @@ -0,0 +1,873 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: evregion - Operation Region support + * + * Copyright (C) 2000 - 2022, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#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_execute_orphan_reg_method(struct acpi_namespace_node *device_node, + acpi_adr_space_type space_id); + +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])) { + acpi_ev_execute_reg_methods(acpi_gbl_root_node, + acpi_gbl_default_address_spaces + [i], ACPI_REG_CONNECT); + } + } + + (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. + * + * NOTE: During early initialization, we always install the default region + * handlers for Memory, I/O and PCI_Config. This ensures that these operation + * region address spaces are always available as per the ACPI specification. + * This is especially needed in order to support the execution of + * module-level AML code during loading of the ACPI tables. + * + ******************************************************************************/ + +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_mutex context_mutex; + u8 context_locked; + 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; + context_mutex = handler_desc->address_space.context_mutex; + context_locked = FALSE; + + /* + * 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); + } + + if (region_obj->region.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) { + struct acpi_pcc_info *ctx = + handler_desc->address_space.context; + + ctx->internal_buffer = + field_obj->field.internal_pcc_buffer; + ctx->length = (u16)region_obj->region.length; + ctx->subspace_id = (u8)region_obj->region.address; + } + + /* + * 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); + + 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 interpreter. + */ + acpi_ex_exit_interpreter(); + } + + /* + * 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 + * + * Since we pass these extra parameters via the context, which is + * shared between threads, we must lock the context to avoid these + * parameters being changed from another thread before the handler + * has completed running. + * + * 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 || + region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) && + context && field_obj) { + + status = + acpi_os_acquire_mutex(context_mutex, ACPI_WAIT_FOREVER); + if (ACPI_FAILURE(status)) { + goto re_enter_interpreter; + } + + context_locked = TRUE; + + /* 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) { + address = field_obj->field.pin_number_index; + bit_width = field_obj->field.bit_length; + } + } + + /* Call the handler */ + + status = handler(function, address, bit_width, value, context, + region_obj2->extra.region_context); + + if (context_locked) { + acpi_os_release_mutex(context_mutex); + } + + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]", + acpi_ut_get_region_name(region_obj->region. + space_id))); + + /* + * Special case for an EC timeout. These are seen so frequently + * that an additional error message is helpful + */ + if ((region_obj->region.space_id == ACPI_ADR_SPACE_EC) && + (status == AE_TIME)) { + ACPI_ERROR((AE_INFO, + "Timeout from EC hardware or EC device driver")); + } + } + +re_enter_interpreter: + 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); + + /* Install the region's handler */ + + if (region_obj->region.handler) { + return_ACPI_STATUS(AE_ALREADY_EXISTS); + } + + 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; + 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; + const acpi_name *reg_name_ptr = + ACPI_CAST_PTR(acpi_name, METHOD_NAME__REG); + struct acpi_namespace_node *method_node; + struct acpi_namespace_node *node; + acpi_status status; + + ACPI_FUNCTION_TRACE(ev_execute_reg_method); + + if (!acpi_gbl_namespace_initialized || + region_obj->region.handler == NULL) { + return_ACPI_STATUS(AE_OK); + } + + region_obj2 = acpi_ns_get_secondary_object(region_obj); + if (!region_obj2) { + return_ACPI_STATUS(AE_NOT_EXIST); + } + + /* + * Find any "_REG" method associated with this region definition. + * The method should always be updated as this function may be + * invoked after a namespace change. + */ + node = region_obj->region.node->parent; + 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; + } + if (region_obj2->extra.method_REG == NULL) { + return_ACPI_STATUS(AE_OK); + } + + /* _REG(DISCONNECT) should be paired with _REG(CONNECT) */ + + if ((function == ACPI_REG_CONNECT && + region_obj->common.flags & AOPOBJ_REG_CONNECTED) || + (function == ACPI_REG_DISCONNECT && + !(region_obj->common.flags & AOPOBJ_REG_CONNECTED))) { + 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]); + + if (ACPI_FAILURE(status)) { + goto cleanup2; + } + + if (function == ACPI_REG_CONNECT) { + region_obj->common.flags |= AOPOBJ_REG_CONNECTED; + } else { + region_obj->common.flags &= ~AOPOBJ_REG_CONNECTED; + } + +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 + * function - Passed to _REG: On (1) or Off (0) + * + * RETURN: None + * + * DESCRIPTION: Run all _REG methods for the input Space ID; + * Note: assumes namespace is locked, or system init time. + * + ******************************************************************************/ + +void +acpi_ev_execute_reg_methods(struct acpi_namespace_node *node, + acpi_adr_space_type space_id, u32 function) +{ + struct acpi_reg_walk_info info; + + ACPI_FUNCTION_TRACE(ev_execute_reg_methods); + + /* + * These address spaces do not need a call to _REG, since the ACPI + * specification defines them as: "must always be accessible". Since + * they never change state (never become unavailable), no need to ever + * call _REG on them. Also, a data_table is not a "real" address space, + * so do not call _REG. September 2018. + */ + if ((space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) || + (space_id == ACPI_ADR_SPACE_SYSTEM_IO) || + (space_id == ACPI_ADR_SPACE_DATA_TABLE)) { + return_VOID; + } + + info.space_id = space_id; + info.function = function; + 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) + */ + (void)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 and GPIO: handle "orphan" _REG methods with + * no region. + */ + if (space_id == ACPI_ADR_SPACE_EC || space_id == ACPI_ADR_SPACE_GPIO) { + acpi_ev_execute_orphan_reg_method(node, space_id); + } + + 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_VOID; +} + +/******************************************************************************* + * + * 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, info->function); + return (status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_execute_orphan_reg_method + * + * PARAMETERS: device_node - Namespace node for an ACPI device + * space_id - The address space ID + * + * RETURN: None + * + * DESCRIPTION: Execute an "orphan" _REG method that appears under an ACPI + * device. This is a _REG method that has no corresponding region + * within the device's scope. ACPI tables depending on these + * "orphan" _REG methods have been seen for both EC and GPIO + * Operation Regions. Presumably the Windows ACPI implementation + * always calls the _REG method independent of the presence of + * an actual Operation Region with the correct address space ID. + * + * MUTEX: Assumes the namespace is locked + * + ******************************************************************************/ + +static void +acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node *device_node, + acpi_adr_space_type space_id) +{ + 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_execute_orphan_reg_method); + + if (!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(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(device_node, NULL); + while (next_node) { + if ((next_node->type == ACPI_TYPE_REGION) && + (next_node->object) && + (next_node->object->region.space_id == space_id)) { + goto exit; /* Do not execute the _REG */ + } + + next_node = acpi_ns_get_next_node(device_node, next_node); + } + + /* Evaluate the _REG(space_id,Connect) method */ + + args.count = 2; + args.pointer = objects; + objects[0].type = ACPI_TYPE_INTEGER; + objects[0].integer.value = space_id; + objects[1].type = ACPI_TYPE_INTEGER; + objects[1].integer.value = ACPI_REG_CONNECT; + + (void)acpi_evaluate_object(reg_method, NULL, &args, NULL); + +exit: + /* We ignore all errors from above, don't care */ + + (void)acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); + return_VOID; +} |